Patent Publication Number: US-10317740-B2

Title: Display panel and display apparatus having the same

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority from Korean Patent Application No. 10-2016-0137915, filed on Oct. 21, 2016 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. 
     BACKGROUND 
     1. Field 
     Methods and apparatuses consistent with exemplary embodiments relate to a display panel and a display apparatus having the display panel. 
     2. Related Art 
     A display apparatus is a type output device configured to convert and visually display acquired or stored electronic information. Display apparatuses are used in various places such as homes, workplaces, and the like. 
     Multiple types of display apparatuses are capable of outputting an image to the outside using different types of display units. For example, the display unit may be a cathode ray tube (CRT), a liquid crystal display (LCD), a light emitting diode (LED), an organic light emitting diode (OLED), an active matrix OLED, electronic paper, or the like. 
     The display apparatuses may be used, for example, in a television, various audio/video systems, a computer monitor device, a navigation terminal device, various portable terminal devices, such as a notebook computer device, a smartphone, a tablet personal computer (PC), a personal digital assistant (PDA), a cellular phone, or the like. Additionally, various display devices may be used in industrial fields to display still images or moving. 
     SUMMARY 
     Exemplary embodiments may address at least the above problems and/or disadvantages and other disadvantages not described above. Also, exemplary embodiments are not required to overcome the disadvantages described above, and may not overcome any of the problems described above. Exemplary embodiments provide a display panel having further improved color reproducibility to output an image with appropriate colors, and a display apparatus including the display panel. 
     According to an aspect of an exemplary embodiment, there is provided a display panel including: a light transmitter disposed on a first pixel electrode; and a light converting unit disposed on a second pixel electrode. A portion of the light converting unit extends toward the light transmitter and covers a part of the first pixel electrode. 
     The first pixel electrode may be a blue pixel electrode; and the second pixel electrode may be a green pixel electrode. 
     The light transmitter may include: a light transmitting material; and dispersion particles distributed throughout the light transmitting material. 
     The light transmitter may include: a dye configured to absorb light other than blue light; and dispersion particles. 
     The light transmitter may include: a dye configured to absorb at least one among red light and green light; and dispersion particles. 
     The light converting unit may include green light quantum dot particles configured to convert light incident on the light converting unit into green-based light. 
     The portion of the light converting unit may be configured to convert a portion of blue light incident on the blue pixel electrode to green light, and light incident on the blue pixel electrode may be emitted as mixed blue light and green light. 
     A width of the portion of the light converting unit may be 1% to 25% of a width of the first pixel electrode. 
     An area of the first pixel electrode covered by the light converting unit may be in a range of 1% to 25% of an area of the first pixel electrode. 
     The dispersion particles may include at least one among a zinc oxide, a titanium oxide, and a silicon oxide. 
     The light transmitting material may include at least one among a natural resin, a synthetic resin, and a glass. 
     According to an aspect of another exemplary embodiment, there is provided a display apparatus including: a display panel including: a light transmitter disposed on a first pixel electrode; and a light converting unit disposed on a second pixel electrode and the first pixel electrode; and a light source configured to emit light toward the display panel. 
     The first pixel electrode may be a blue pixel electrode; and the second pixel electrode may be a green pixel electrode. 
     The light transmitter may include: a light transmitting material; and dispersion particles distributed throughout the light transmitting material. 
     The light transmitter may include: a dye configured to absorb light other than blue light; and dispersion particles. 
     The light transmitter may include: a dye configured to absorb at least one among red light and green light; and dispersion particles. 
     The light converting unit may include green light quantum dot particles configured to convert light incident on the light converting unit into green-based light. 
     A portion of the light converting unit disposed on the blue pixel electrode may be configured to convert a portion of blue light incident on the blue pixel electrode to green light, and light incident on the blue pixel electrode may be emitted as mixed blue light and green light. 
     A width a portion of the light converting unit disposed on the first pixel electrode may be 1% to 25% of a width of the first pixel electrode. 
     An area of the first pixel electrode covered by the light converting unit may be in a range of 1% to 25%. 
     The display apparatus may further include a liquid crystal layer, and the light transmitter and the light converting unit may be disposed on the liquid crystal layer. 
     The light source may include a plurality of light emitting diodes, and the light transmitter and the light converting unit may be disposed on the plurality of light emitting diodes. 
     The light transmitter may be one of a plurality of light transmitters, the light converting unit may be one of a plurality of light converting units, and the plurality of light transmitters and the plurality of light converting units may be arranged in a repeating pattern 
     According to an aspect of another exemplary embodiment, there is provided a display panel including: a light transmitter disposed on a first pixel electrode, the light transmitter including a plurality of light converting particles configured to convert light incident on the plurality of light converting particles to a first color; and a first light converting unit disposed on a second pixel electrode, the first light converting unit including a first plurality of quantum dot particles configured to convert light incident on the first light converting unit to the first color. 
     A plurality of light dispersion particles may be distributed throughout the light transmitter and the first light converting unit. 
     The display panel may further include a light source configured to radiate light towards the light transmitter and the first light converting unit. 
     The display panel may further include a second light converting unit disposed on a third pixel electrode, the second light converting unit including a second plurality of quantum dot particles configured to convert light incident on the second light converting unit to a second color. 
     Each of the first plurality of quantum dot particles may have a diameter in a range of 2 nm to 3 nm, and each of the second plurality of quantum dot particles may have a diameter in a range of 5 nm to 6 nm. 
     The display panel may further include a light source configured to radiate blue light towards the light transmitter, the first light converting unit and the second light converting unit, the first color may be green, and the second color may be red. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and/or other aspects will become apparent and more readily appreciated from the following description of exemplary embodiments, taken in conjunction with the accompanying drawings in which: 
         FIG. 1  is a view illustrating a quantum dot converter and a light transmitter used in a display panel of a display assembly according to an exemplary embodiment; 
         FIG. 2  is a view illustrating the light transmitter in detail according to an exemplary embodiment; 
         FIG. 3  is a view illustrating an external light source according to an exemplary embodiment; 
         FIG. 4  is a graph illustrating a relationship between intensity and wavelength of light emitted from a light source according to an exemplary embodiment; 
         FIG. 5  is a side cross-sectional view illustrating a display panel according to an exemplary embodiment; 
         FIG. 6  is a view illustrating transmission of light based on an arrangement of liquid crystals in a liquid crystal layer according to an exemplary embodiment; 
         FIG. 7  is a view illustrating blocking of light based on an arrangement of liquid crystals in a liquid crystal layer according to an exemplary embodiment; 
         FIG. 8  is a side view illustrating size relations between a first electrode and a light transmitter, a red light quantum dot unit, and a green light quantum dot unit according to an exemplary embodiment; 
         FIG. 9  is a plan view illustrating size relations between the first electrode and the light transmitter, the red light quantum dot unit, and the green light quantum dot unit according to an exemplary embodiment; 
         FIG. 10  is a side view illustrating of size relations between a first electrode with a light transmitter, a red light quantum dot unit, and a green light quantum dot unit according to an exemplary embodiment; 
         FIG. 11  is a plan view illustrating size relations between the first electrode and the light transmitter, the red light quantum dot unit, and the green light quantum dot unit according to an exemplary embodiment; 
         FIG. 12A  is a view illustrating a color gamut for describing a color reproducing ratio by a display panel according to an exemplary embodiment; 
         FIG. 12B  is an enlarged view illustrating an area of a blue family in the color gamut of  FIG. 12A ; 
         FIG. 12C  is a table illustrating an example of locations of red, green, and blue colors in the color gamut of  FIG. 12A ; 
         FIG. 13A  is a view illustrating a color gamut for describing a color reproduction ratio of a display panel using a light converting unit or a light converter included in a light source according to an exemplary embodiment; 
         FIG. 13B  is an enlarged view illustrating an area of a blue family in the color gamut of  FIG. 13A ; 
         FIG. 14  is a table illustrating an example of locations of red, green, and blue colors in the color gamut of  FIG. 13A ; 
         FIGS. 15 to 18  illustrated structures in which a red light quantum dot unit, a green light quantum dot unit, and a light transmitter are disposed according to various exemplary embodiments; 
         FIG. 19  is a side cross-sectional view illustrating another exemplary embodiment of a display panel; 
         FIG. 20  is a perspective view illustrating an exterior of an exemplary embodiment of a display apparatus; 
         FIG. 21  is a structural view illustrating an exemplary embodiment of a display apparatus; 
         FIG. 22  is an exploded perspective view illustrating a first exemplary embodiment of a display apparatus; 
         FIG. 23  is a side cross-sectional view illustrating the first exemplary embodiment of the display apparatus; 
         FIG. 24  is a view illustrating a blue light emitting diode illumination lamp as an exemplary embodiment of a light source of the display apparatus; 
         FIG. 25  is a side cross-sectional view illustrating a display panel of a first exemplary embodiment of the display apparatus; 
         FIG. 26  is an exploded perspective view illustrating a second exemplary embodiment of a display apparatus; 
         FIG. 27  is a side cross-sectional view illustrating the second exemplary embodiment of the display apparatus; 
         FIG. 28  is an exploded perspective view illustrating a third exemplary embodiment of the display apparatus; and 
         FIG. 29  is a side cross-sectional view illustrating the third exemplary embodiment of the display apparatus. 
     
    
    
     DETAILED DESCRIPTION 
     The following detailed description is provided to assist the reader in gaining a comprehensive understanding of the methods, apparatuses, and/or systems described herein. Accordingly, various changes, modifications, and equivalents of the methods, apparatuses, and/or systems described herein will be suggested to those of ordinary skill in the art. The progression of processing operations described is exemplary, and the sequence of and/or operations is not limited to that set forth herein and, unless noted otherwise, may be changed as is known in the art. In addition, descriptions of well-known functions and constructions may be omitted for increased clarity and conciseness. 
     Exemplary embodiments will now be described more fully with reference to the accompanying drawings. The exemplary embodiments may, however, be embodied in many different forms and should not be construed as being limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided so that this disclosure will be thorough and complete and will fully convey the exemplary embodiments to those of ordinary skill in the art. 
     It will be understood that, although the terms first, second, etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. As used herein, the term “and/or,” includes any and all combinations of one or more of the associated listed items. Expressions such as “at least one of,” when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list. 
     It will be understood that when an element is referred to as being “connected,” or “coupled,” to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is referred to as being “directly connected,” or “directly coupled,” to another element, there are no intervening elements present. 
     The terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. As used herein, the singular forms “a,” “an,” and “the,” are intended to include the plural forms as well, unless the context clearly indicates otherwise. 
     Reference will now be made in detail to exemplary embodiments, aspects of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. 
       FIG. 1  is a view illustrating an operating principle of a quantum dot converter and a light transmitter used in a display panel of a display assembly, and  FIG. 2  is a view illustrating the light transmitter in detail. 
     Referring to  FIGS. 1 and 2 , a display assembly  1  may include a light source  2 , a quantum dot converter  3 , and a light transmitter  6 . Light emitted from the light source  2  is incident on the quantum dot converter  3  and the light transmitter  6 . 
     The light source  2  may emit light L, which may be incident on the quantum dot converter  3  or the light transmitter  6 . In the exemplary embodiment, the light source  2  may emit blue-based light. In this case, the blue-based light may be partially biased to a green color. The light source  2  will be described below. 
     The quantum dot converter  3  may change a color of the light L emitted from the light source  2  and incident on one side of the quantum dot converter  3 , and emit light RL and GL of different colors from an opposite side of the quantum dot converter. For example, the quantum dot converter  3  may convert blue light BL emitted from the light source  2  into red light RL or green light GL, and then emit the converted light to the outside. In particular, the quantum dot converter  3  may change the wavelength of the incident light, and emit light having a different color from that of the incident light (wavelength shift). 
     The quantum dot converter  3  may change a color of the light L emitted from the light source  2  using quantum dots (QD). 
     Quantum dots may refer to semiconductor crystals formed by aggregating hundreds to thousands of atoms. A quantum dot may be in a range of several nanometers to tens of nanometers. Because of the small size, the quantum dot may take advantage of a quantum confinement effect. In the quantum confinement effect, when the particles are very small, electrons in a particle form a discrete energy state by an outer surface of the particle, and as the size of a space in the particle is small, an energy state of the electron is relatively increased and a bandgap is widened. Thus, the quantum dots, according to the above quantum confinement effect, may be used to generate light having various wavelengths when light such as ultraviolet light, visible light, and/or the like is incident thereon. In this case, the quantum dot disperses and emits the incident light. 
     A length of a wavelength of light generated from quantum dots may depend on a size of a particle. In particular, when light has a wavelength having a greater energy than bandgap energy is incident onto the quantum dot, the quantum dot absorbs energy of the light and is excited, emits light having a predetermined wavelength, and thus, becomes a ground state. In this case, when the size of the quantum dot is small, light having a relatively short wavelength such as blue-based light or green-based light may be generated, and when the size of the quantum dot is large, light having a relatively long wavelength such as red-based light may be generated. Thus, light of various colors may be realized based on sizes of the quantum dots. 
     Hereinafter, a quantum dot particle capable of emitting green light based on incident light is referred to as a green quantum dot particle, and a quantum dot particle capable of emitting red light based on incident light is referred to as a red quantum dot particle. The green quantum dot particle may have a width in a range of 2 nm to 3 nm, and the red quantum dot particle may have a width in a range of 5 nm to 6 nm. 
     The quantum dot converter  3  may include a plurality of quantum dots, and the plurality of quantum dots may emit light of various colors based on sizes thereof. Thus, the quantum dot converter  3  may convert incident light using the quantum dots, and emit light of different colors. 
     The quantum dot converter  3  may include one surface  3   i  (hereinafter, referred to as a first incident surface) on which the light, such as blue light BL radiated from the light source, is incident and the other surface  3   t  (hereinafter, referred to as a first emitting surface) from which the light RL and GL having the converted colors are emitted. The first incident surface  3   i  is disposed to face the light source  2 , and the first emitting surface  3   t  is disposed to face a direction opposite the light source  2 . 
     The first emitting surface  3   t  may be designed to have a greater area than a second emitting surface  6   t  through which light is emitted from the light transmitter  6 . Thus, when an amount of light emitting per unit area is the same, the first emitting surface  3   t  emits more light than the second emitting surface  6   t  of the light transmitter  6 . When the first emitting surface  3   t  is provided to have a greater area than the second emitting surface  6   t , the first incident surface  3   i  may also be provided to have a greater area than the second incident surface  6   i.    
     The first incident surface  3   i  of the quantum dot converter  3  may include a third incident surface  4   i  and a fourth incident surface  5   i  onto which light radiated from the light source  2 , for example, blue-based lights are respectively incident, and the first emitting surface  3   t  may include a third emitting surface  4   t  from which red-based light is emitted, and a fourth emitting surface  5   t  from which green-based light is emitted. 
     In some exemplary embodiments, a filtering part  16   e  (shown in  FIG. 19 ) may be further installed on the first emitting surface  3   t . The filtering part  16   e  will be described below. 
     The quantum dot converter  3  may include at least one red light quantum dot unit  4  and at least one green light quantum dot unit  5 . 
     The red light quantum dot unit  4  emits red-based light RL based on a quantum isolation effect. The red light quantum dot unit  4  is formed to include a plurality of red quantum dot particles, and a size of the red quantum dot particle in the red light quantum dot unit  4  is relatively greater than a size of the green quantum dot particle in the green light quantum dot unit  5 . 
     The green light quantum dot unit  5  emits green-based light GL having a wavelength greater than the incident blue-based light BL. The green light quantum dot unit  5  is formed to include a plurality of green quantum dot particles, and a size of the green quantum dot particle is relatively smaller than a size of the red quantum dot particle in the red light quantum dot unit  4 . 
     The red light quantum dot unit  4  and the green light quantum dot unit  5  may have a thin plate shape having a predetermined thickness, and may be disposed on a substrate or the like. In this case, the red light quantum dot unit  4  may include the third incident surface  4   i  onto which light radiated from the light source  2 , for example, the blue light BL is incident and the third emitting surface  4   t  from which the converted red light RL is emitted. Similarly, the green light quantum dot unit  5  may include the fourth incident surface  5   i  onto which light radiated from the light source  2  is incident and the fourth emitting surface  5   t  from which the green light GL is emitted. 
     In an exemplary embodiment, an area of the third emitting surface  4   t  may be equal to or greater than that of the second emitting surface  6   t  through which light is emitted from the light transmitter  6 . In the same way, an area of the third incident surface  4   i  may be equal to or greater than that of the second incident surface  6   i  on which the light BL is incident on the light transmitter  6 . In an exemplary embodiment, an area of the fourth emitting surface  5   t  may be equal to or greater than that of the second emitting surface  6   t  through which the light is emitted from the light transmitter  6 , and an area of the fourth incident surface  5   i  may be equal to or greater than that of the second incident surface  6   i . Also, both areas of the third emitting surface  4   t  and the fourth emitting surface  5   t  may be greater than the area of the second emitting surface  6   t.    
     When the area of the third incident surface  4   i  and the area of the fourth incident surface  5   i  are greater than the area of the second incident surface  6   i , more light BL may be incident onto the third incident surface  4   i  and the fourth incident surface  5   i  than onto the second incident surface  6   i . Also, when the area of the third emitting surface  4   t  and the area of the fourth emitting surface  5   t  are greater than that of the second emitting surface  6   t , more light (RL and GL) may be emitted from the third emitting surface  4   t  and the fourth emitting surface  5   t  than from the second emitting surface  6   t . Thus, when the area of the third incident surface  4   i  and the area of the fourth incident surface  5   i  are greater than that of the second incident surface  6   i , or the area of the third emitting surface  4   t  and the area of the fourth emitting surface  5   t  are greater than that of the second emitting surface  6   t , an amount of the light RL and GL incident onto or emitted from the red light quantum dot unit  4  or the green light quantum dot unit  5  is greater than an amount of the light TL emitted from the light transmitter  6 . Therefore, a ratio of the emitted red-based light RL, the green-based light GL, and the blue-based light TL may be equal to or similar to each other. 
     The red light quantum dot unit  4  and the green light quantum dot unit  5  may be disposed adjacent to each other, and in this case, side surfaces of the red light quantum dot unit  4  and the green light quantum dot unit  5  may contact each other. Alternatively, the red light quantum dot unit  4  and the green light quantum dot unit  5  may be spaced apart from each other by a predetermined distance. When the side surfaces of the red light quantum dot unit  4  and the green light quantum dot unit  5  are spaced apart from each other, a predetermined material may be inserted between the red light quantum dot unit  4  and the green light quantum dot unit  5 , thereby preventing an interference therebetween. 
     Because the quantum dots cause the light to be dispersed, the red light quantum dot unit  4  and the green light quantum dot unit  5  disperse and emit the red light RL and the green GL in various directions. 
     In an exemplary embodiment, a filtering part  16   e  (shown in  FIG. 19 ) configured to filter a part of the emitted light may be further provided on the third emitting surface  4   t  and the fourth emitting surface  5   t  of the red light quantum dot unit  4  and the green light quantum dot unit  5 . 
     In an exemplary embodiment, the filtering part  16   e  may filter the blue-based light. Colors of the blue-based light incident onto the red light quantum dot unit  4  and the green light quantum dot unit  5  are generally changed by the quantum dots. However, a part of the blue-based light may be emitted from the red light quantum dot unit  4  and the green light quantum dot unit  5  without contacting the quantum dots. Thus, the filtering part  16   e  may be used to filter the blue-based light emitted from the red light quantum dot unit  4  and the green light quantum dot unit  5 . When the filtering part  16   e  filters the blue-based light, the filtering part  16   e  may include a blue light cut-off filter (BCF). 
     The light transmitter  6  emits light radiated from the light source  2  in a direction opposite an incident direction. In this case, in the light transmitter  6 , as illustrated in  FIG. 2 , a part of the incident light L is directly transmitted (BLA 1 ), another other parts are dispersed and transmitted (BL 1  to BL 3 ), or converted into light GL 1  to GL 3  of different colors and then emitted. When the light incident from the light source  2  is the blue-based light BL, the light transmitter  6  may emit blue light BLA 1  and BL 1  to BL 3  having the same color as the incident light together with light having a different color such as green-based light GL 1  to GL 3 . 
     The light transmitter  6  may be a thin plate having a thickness similar to the red light quantum dot unit  4  and the green light quantum dot unit  5 . Light radiated from the light source is incident onto one surface ( 6   i , hereinafter, referred to as a second incident surface) of the light transmitter  6 , and light is emitted from the other surface  6   t  (hereinafter, referred to as a second emitting surface) of the light transmitter  6 . 
     As illustrated in  FIG. 2 , the light transmitter  6  may include a main body  8 , at least one dispersion particle  7   a  dispersed in the main body  8 , and at least one light converting unit  7   b  dispersed in the main body  8  and converting the light BL of a predetermined color into light of a different color. 
     The main body  8  may be provided with a light transmitting material capable of transmitting all or a part of incident light. Here, the light transmitting material may include a material having a transparency equal to or more than a predetermined level such as a resin including a natural resin, a synthetic resin, and/or the like, or glass and/or the like. The synthetic resin may include an epoxy resin, a urethane resin, polymethyl methacrylate (PMMA), and/or the like, and the glass may include silicate glass, borate glass, phosphate glass, and/or the like. Additionally, various materials capable of transmitting various types of light may be used as the light transmitting material according to one or more exemplary embodiments. 
     Light of a predetermined color such as the blue-based light BL may be incident onto the main body  8  through the incident surface  6   i , and then, emitted to the outside through the second emitting surface  6   t.    
     A part of the light BL incident onto the main body  8  (BLA) may encounter neither the dispersion particle  7   a  nor the light converting unit  7   b  while passing through the main body  8 , and be emitted without a change of direction or color through the second emitting surface  6   t  (BLA 1 ). Also, other parts of the light BL incident onto the main body  8  (BLB and BLC) may be dispersed or color-changed by any one of the dispersion particle  7   a  and the light converting unit  7   b , and then emitted (BL 1  to BL 3  and GL 1  to GL 3 ). 
     The dispersion particles  7   a  may be disposed in the main body  8  in a random or predetermined pattern, and disperse incident light in a predetermined range. For example, the dispersion particle  7   a  may disperse the incident blue-based light BLB. A part BLA of the incident blue-based light BL contacts the dispersion particle  7   a  and is dispersed and emitted. Thus, a part BLB of the light BL incident onto the light transmitter  6  is dispersed in a predetermined range, and passes through the light transmitter  6  (BL 1  to BL 3 ). 
     In an exemplary embodiment, the dispersion particle  7   a  may include at least one of zinc oxide (Zn x O x ), titanium oxide (Ti x O x ), and silicon oxide (Si x O x ), and particles of various types capable of dispersing incident light may also be adopted as the above dispersion particle  7   a.    
     Because a part BLB of the incident light BL due to the dispersion particle  7   a  is dispersed and emitted (BL 1  to BL 3 ), the light passed through the light transmitter  6  may be dispersed and emitted in a range equal to or similar to that of the light RL and GL emitted from the red light quantum dot unit  4  and the green light quantum dot unit  5 . 
     When the blue-based light BL passes through the light transmitter  6 , because the incident blue light BL is diffused and emitted more than in a case in which the dispersion particle  7   a  does not exist, the blue light BL may be emitted in a forward direction d 1  as well as an oblique direction d 2 . The range in which the blue-based light BLB is dispersed may be different based on types of the dispersion particle  7   a , and/or the like. Thus, because the blue-based light BLB is dispersed by the dispersion particle  7   a , a disadvantageous color viewing angle which may be caused by smaller dispersion of the blue-based light than light of other colors may be solved. 
     The light converting units  7   b  are disposed in the main body  8  in a random or predetermined pattern, and change the color of the incident light, which can then be emitted. For example, when the incident light is the blue-based light BL, the blue-based light BL may be converted into the green-based light GL or the red-based light RL and emitted. 
     The light converting unit  7   b , for example, may include a green light converting unit which converts the blue-based light BLC into the green-based light GL. 
     In an exemplary embodiment, the green light converting unit may include at least one of a green quantum dot particle and a green fluorescent particle. In other words, in the main body  8 , only green quantum dot particles may be disposed, or only green fluorescent particles may be disposed, or both the green quantum dot particles and the green fluorescent particles may be disposed. When the green quantum dot particles and the green fluorescent particles are both disposed in the main body  8 , both may be included in the same ratio, or in a different ratio. 
     The green quantum dot particle may be a semiconductor crystal having the above described size of 2 nm to 3 nm. 
     Because the green fluorescent particle changes a wavelength of incident light, light of a predetermined color may be converted into green-based light. For example, the green fluorescent particle may convert the blue-based light BLC into the green-based light GL 1  to GL 3 . 
     The green fluorescent particle may disperse and emit the incident light BLC. In this case, after the incident blue-based light BLC is converted into the green-based light GL 1  to GL 3 , the green-based light GL 1  to GL 3  may be emitted in a forward direction d 3  as well as an oblique direction d 4 . 
     The green fluorescent particle may be a particle having a width of several nanometers to tens of nanometers, and may include various inorganic fluorescent materials (for example, ZnS(Ag), and/or the like) realized using zinc sulfide, cadmium sulfide, and/or the like. Additionally, for example, means of various types capable of emitting the green-based light by changing the wavelength of the blue-based light may be used as a green fluorescent particle. 
     In an exemplary embodiment, the green fluorescent particle may include a green fluorescent material having a maximum width of 540 nm or less. 
     Thus, when the green light converting unit is provided in the main body  8  of the light transmitter  6  onto which the blue-based light BL is incident, a wavelength of a part of blue-based light passed through the light transmitter  6  is changed, and becomes the green-based light GL 1  to GL 3 . Thus, in the light transmitter  6 , because an emitted light is a mixture of the blue-based light BLA 1  and the green-based light GL 1  to GL 3  which are passed through the main body  8 , the emitted blue-based light TL has an added green color compared with a case in which the green light converting unit does not exist. Thus, when the incident blue-based light BL is more turbid than a primary blue, the primary color may be emitted from the light transmitter  6 . 
     The dispersion particles  7   a  and the light converting units  7   b  may be distributed in the main body  8  in nearly the same ratio, or distributed in a different ratio. In other words, the dispersion particles  7   a  and the light converting units  7   b  may be included in the main body  8  in nearly the same ratio, or the dispersion particles  7   a  may be included in a greater amount than the light converting units  7   b , or in contrast, the light converting units  7   b  may be included in a greater amount than the dispersion particles  7   a.    
     When the dispersion particles  7   a  and the light converting units  7   b  are manufactured by curing the main body  8 , such as an epoxy resin and/or the like, in a liquid state, the dispersion particles  7   a  and the light converting units  7   b  may be injected into the main body  8  and distributed in the main body  8 , and the dispersion particles  7   a  and the light converting units  7   b  may be injected into the main body  8  before curing the main body  8  or during a process of curing the main body  8 . 
     A small amount of the dispersion particles  7   a  and light converting units  7   b  may be included in the main body  8 , but the amount of the dispersion particles  7   a  and the light converting units  7   b  included in the main body  8  may be changed according to one or more exemplary embodiments. For example, when increased dispersion of the incident light BL is desired, additional dispersion particles  7   a  may be injected into the main body  8 . Also, when the blue-based light BL is incident, and more green-based light is desired to be emitted, more light converting units  7   b  may be injected into the main body  8 . 
     The dispersion particles  7   a  and the light converting units  7   b  may be omitted according to exemplary embodiments. In particular, when a light converter  2   d  is provided in the light source  2 , the light converting units  7   b  may be omitted. 
     The quantum dot converter  3  and the light transmitter  6 , more particularly, the red light quantum dot unit  4 , the green light quantum dot unit  5 , and the light transmitter  6  may be disposed on the same plane in the display panel, and may be formed in one thin plate shape. The light transmitter  6 , the red light quantum dot unit  4 , the green light quantum dot unit  5 , and the light transmitter  6  may be installed on a predetermined substrate to provide stability. The substrate may be formed of a transparent material, and thus, may transmit the light emitted from the red light quantum dot unit  4 , the green light quantum dot unit  5 , and the light transmitter  6 . For example, the substrate may be formed of a transparent material such as poly methyl methacrylate resin. 
     The light source  2  generates light, and radiates the light onto the quantum dot converter  3  and the light transmitter  6 . The light source  2  may generate light having intensity and luminance corresponding to electric power applied from the outside, and radiate the light onto the quantum dot converter  3  and the light transmitter  6 . By requirements, the light generated from the light source  2  may be reflected from an additional reflective plate, an aperture, and/or the like, and may be radiated in a direction toward the quantum dot converter  3  and the light transmitter  6 . 
       FIG. 3  is a view illustrating an example of an external light source, and  FIG. 4  is a graph illustrating a relationship between intensity and wavelength of light emitted from a light source. In  FIG. 4 , a y-axis represents the intensity of the light, and an x-axis represents the wavelength of the light. 
     The light source  2  may generate light of a predetermined color, and may generate blue-based light BL in an exemplary embodiment. The blue-based light BL represents light having a wavelength relatively shorter than red-based light or green-based light, 400 nm to 500 nm. The blue-based light BL incident onto the quantum dot converter  3  is converted into the red-based light RL or the green-based light GL, and is emitted to the outside. The blue light BL incident onto the light transmitter  6  may be transmitted through the light transmitter, dispersed in the light transmitter  6 , or converted into the green-based light, and then, emitted. 
     The display assembly  1  may include only one light source  2  or a plurality of light sources  2 . When the display assembly  1  includes the plurality of light sources  2 , the light sources  2  may be provided in each of the red light quantum dot unit  4  and the green light quantum dot unit  5  of the quantum dot converter  3 , and the light transmitter  6 . In this case, the number of light sources  2  corresponds to the number of the red light quantum dot units  4 , the number of green light quantum dot units  5 , and the number of light transmitters  6 . 
     The light source  2  may be realized using a light bulb, a halogen lamp, a fluorescent lamp, a sodium lamp, a mercury lamp, a fluorescent mercury lamp, a xenon lamp, an arc illumination lamp, a neon tube lamp, an electroluminescent (EL) lamp, a light emitting diode (LED) lamp, a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp (EEFL), and/or the like. Additionally, various illumination devices configured to generate light of a predetermined color, such as a blue color, may be used as the light source  2 . 
     Referring to  FIG. 3 , the light source  2  may include a housing  2   a , an inner space  2   b , a light emitter  2   c , a light converter  2   d , and a light emitter  2   e.    
     The housing  2   a  is provided to form an exterior of the light source  2 , has the inner space  2   b  therein, and includes the light emitter  2   c  in the inner space  2   b . For example, the housing  2   a  includes an outer wall frame and a bottom frame which form the inner space  2   b , and the light emitter  2   c  may be formed on one surface of the bottom frame toward the inner space  2   b . Various cables or circuits configured to supply electric power to the light emitter  2   c  may be provided on one surface or an opposite surface in a direction toward the inner space  2   b  of the lower frame. The housing  2   a  blocks leakage of incident light toward the outside, and the light emitted from the light emitter  2   c  or the light converted by the light converter  2   d  is emitted only in a predetermined direction. 
     The inner space  2   b  is formed by the housing  2   a  and the light emitter  2   e , and air, particles, and/or the like related to generation of the light or conversion of the light are located therein. At least one light converter  2   d  is disposed in the inner space  2   b.    
     The light emitter  2   c  may generate and emit light BLD of a predetermined color based on the electric power supplied from the external power source  9 . The light emitter  2   c  may be realized using an LED. The LED, for example, may include a blue LED, and in this case, the light emitter  2   c  may emit the blue-based light BLD. 
     The light converter  2   d  changes color of a part of the light BLD emitted from the light emitter  2   e  and emits green-based light GL 0   
     In an exemplary embodiment, when the blue-based light BLD is emitted from the light emitter  2   c , the light converter  2   d  may convert the blue-based light BLD into green-based light and emit the converted light through light emitter  2   e . In other words, the light converter  2   d  may change a wavelength of the light BLD emitted from the light emitter  2   c , and for example, the wavelength of the emitted light BLD may be changed to be increased. 
     In this case, the light converter  2   d  may include a green light converting unit configured to convert the blue-based light BLD into the green-based light GL 0 . 
     Here, the green light converting unit may include at least one of a green quantum dot particle and a green fluorescent particle. The green quantum dot particle, as described above, refers to a semiconductor crystal having a size of 2 nm to 3 nm, and the green fluorescent particle changes a wavelength of the incident light to convert the light of a predetermined color into the green-based light. In an exemplary embodiment, the green fluorescent particle may include a green fluorescent material having a maximum width of 540 nm or less. The green quantum dot particle or the green fluorescent particle may have a droplet shape. 
     When the blue-based light BLD is emitted from the light emitter  2   c , a part of the blue-based light BLD may be converted into the green-based light GL 0  by the light converter  2   d  and emitted to the outside, or may be emitted to the outside without a change of the color (BLE). Thus, the light emitter  2   e  may emit the blue-based light BLE and the green-based light GL 0 , and the emitted blue-based light BLE and the emitted green-based light GL 0  are mixed. 
     Thus, as illustrated in  FIG. 4 , the light L emitted from the light source  2 , according to the graph, may include a first area Z 1  displayed by the light BLE which is emitted by the light emitter  2   c  of the blue light emitting diode and whose wavelength is not changed and a second area Z 2  displayed by the green-based light GL 0  which has been converted by the light converter  2   d . In this case, an intensity of light in the second area Z 2  may be changed based on a distribution amount of the light converters  2   d . In particular, when the light converters  2   d  are provided in the inner space  2   b  at a larger amount, the intensity of the light in the second area Z 2  is greatly increased, and is more protruded in the second area Z 2  in the graph. In contrast, when the light converters  2   d  are provided in the inner space  2   b  at a smaller amount, the intensity of the light in the second area Z 2  is more decreased, and has a flatter shape in the second area Z 2  in the graph. Thus, the color of the emitted light L may be controlled by changing the amount of the light converters  2   d . Meanwhile, as illustrated in  FIG. 4 , the light L emitted from the light source  2  may have a greater intensity in the blue-based light than the green-based light. 
     Thus, because the light source  2  may emit the light L closer to the green color than the blue-based light emitted from a blue light emitting diode, although more turbid blue light is emitted from the blue light emitting diode, originally desired blue-based light or light similar to a blue color may be emitted. 
     When the blue-based light L mixed with the green-based light is emitted from the light source  2 , the light converting unit  7   b  in the light transmitter  6  such as the green quantum dot particle or the green fluorescent particle may be omitted. In other words, because the light source  2  emits the blue-based light mixed with the green-based light, the light incident onto the light transmitter  6  may be the blue-based light mixed with the green-based light, and thus, the blue-based light TL added with a green color may be emitted without a change of the color of the incident light L. Also, in some exemplary embodiments, although the blue-based light L mixed with the green-based light is emitted from the light source  2 , the light converting unit  7   b  may be provided in the light transmitter  6 . In this case, the light converting unit  7   b  in the light transmitter  6  mixes more amount of green-based light with the blue-based light L in which the incident green-based light is mixed, and emits the mixed light (TL). Thus, although the blue-based light BLD and BLE emitted from the blue light emitting diode which is the light emitter  2   c  is more turbid than a primary blue color, the blue-based light TL closer to the primary color in the light transmitter  6  may be emitted by the light converter  2   d  in the light source  2  and the light converting unit  7   b  in the light transmitter  6 . 
     In some exemplary embodiments, the light converter  2   d  may be omitted. For example, when the light converting unit  7   b  is provided in the light transmitter  6 , the light source  2  may not include the light converter  2   d.    
     The light emitter  2   e  may be installed in the housing  2   a , and may form an inner space  2   b  with the housing  2   a . The light emitter  2   e , for example, may be installed on an outer wall of the housing  2   a , etc. The light emitter  2   e  may emit light emitted from the light emitter  2   c  and the light converted by the light converter  2   d  in a predetermined direction. The light emitter  2   e  may be formed of a transparent material through which light is transmitted. Here, the transparent material, for example, may be realized using glass or a synthetic resin an acrylic resin. Also, the light emitter  2   e  may be realized using various transparent materials. 
     In  FIG. 3 , the exemplary embodiment including the light emitter  2   e  having a planar shape is described, but the shape of the light emitter  2   e  is not limited thereto, and may have various shapes such as a semicircle, a cylinder, a triangular pyramid, a cylinder having a semispherical shaped head, and/or the like. 
     Hereinafter, a display panel including the above quantum dot converter and the light transmitter will be described. 
       FIG. 5  is a side cross-sectional view illustrating an exemplary embodiment of a display panel.  FIG. 6  is a view illustrating blocking of light based on an arrangement of liquid crystals in a liquid crystal layer, and  FIG. 7  is a view illustrating transmission of light based on an arrangement of liquid crystals in a liquid crystal layer. Hereinafter, for convenience of descriptions, in  FIGS. 5 to 7 , upward directions of the drawings will be referred to as forward directions, and downward directions of the drawings will be referred to as rearward directions. 
     As illustrated in  FIGS. 5 to 7 , a display panel  10  may include a first polarizing filter  11 , a first substrate  12 , a first electrode  13 , a second electrode  14 , a liquid crystal layer  15 , a quantum dot sheet  16 , a second substrate  17 , and a second polarizing filter  18 . 
     The first polarizing filter  11  may polarize light L incident from an external light source, and transmit light only vibrating in a direction the same as a polarizing axis to the first substrate  12 . The first polarizing filter  11 , as illustrated in  FIGS. 5 to 7 , may be provided to have a rear surface facing a light source and a front surface in contact with the rear surface of the first substrate  12  or adjacent thereto. The first polarizing filter  11  may be formed in a film shape. In an exemplary embodiment, the first polarizing filter  11  may be a vertical polarizing filter or a horizontal polarizing filter. 
     The first electrode  13  may be installed on a front surface of the first substrate  12 , and the first polarizing filter  11  may be installed on a rear surface of the first substrate  12 . The first substrate  12  may be formed of a transparent material to transmit the light incident in the rearward direction, and for example, may be realized in a synthetic resin such as an acrylic, glass, and/or the like. In an exemplary embodiment, the first substrate  12  may include a flexible printed circuit board (FPCB). 
     The first electrode  13  installed on the first substrate  12  applies a current to the liquid crystal layer  15  based on an applied electric power along with the second electrode  14 , and thus as illustrated in  FIGS. 6 and 7 , may adjust arrangement of liquid crystal molecules  15   a  and  15   b  in the liquid crystal layer  15 . Therefore, based on the arrangement of the liquid crystal molecules  15   a  and  15   b , a vibration direction of the light PL polarized by the first polarizing filter  11  may be changed or not changed. 
     In an exemplary embodiment, the first electrode  13  may be realized using a thin film transistor (TFT). The first electrode  13  may be connected to the external power source to receive electric power. The first electrodes  13  may be installed in plural number on the first substrate  12 , and the first electrode  13  may be installed on the first substrate  12  in a predetermined pattern. Each of the first electrodes  13  may be installed on the first substrate  12  corresponding to each of liquid crystal molecules  15   a  and  15   b  in the liquid crystal layer  15 . 
     The second electrode  14  is provided to correspond the first electrode  13  with respect to the liquid crystal layer  15 , and applies a current to a liquid crystal layer  15  along with the first electrode  13 . One surface of the second electrode  14  is provided to contact the quantum dot sheet  16 , and the other surface of the second electrode  14  is provided to contact the liquid crystal layer  15 . The second electrode  14  may be realized as a common electrode. 
     The liquid crystal layer  15  is provided between the second electrode  14  and the first electrode  13 , and a plurality of liquid crystal molecules are disposed in the liquid crystal layer  15 . 
     A liquid crystal is a material in a middle state between a liquid state and a crystal state, and may include a plurality of liquid crystal molecules  15   a  and  15   b . The liquid crystal molecules  15   a  and  15   b  may be arranged in a plurality of rows in the liquid crystal layer  15 . The liquid crystal layer  15  may directly transmit, or change a vibration direction and then transmit, light polarized by the first polarizing filter  11  based on alignment of the liquid crystal molecules  15   a  and  15   b.    
     In particular, the liquid crystal molecules in the liquid crystal layer  15  may be arranged in different shapes based on electric power applied between the second electrode  14  and the first electrode  13 . 
     When an electrical field is not applied, the liquid crystal molecule  15   a  may be twisted and arranged in a spiral shape as shown in  FIG. 6 . In this case, the liquid crystal molecule  15   a  may be aligned in the spiral shape in a direction perpendicular to a line segment connected with the first electrode  13  or the second electrode  14 . When the liquid crystal molecule  15   a  is twisted and aligned in the above shape, a vibration direction of the polarized light PL incident onto the liquid crystal layer  15  is twisted by about 90 degrees (PL 1 ). That is, the vibration direction of the polarized light is changed. 
     In contrast, when the electrical field is applied by the first electrode  13  and the second electrode  14 , the liquid crystal molecule  15   b  may be aligned and arranged in a direction parallel with the line segment connecting the first electrode  13  with the second electrode  14  as shown in  FIG. 7  based on the generated electrical field. In this case, the vibration direction of the polarized light PL is not changed, and the light directly passes through the liquid crystal layer  15  (PL 2 ). 
     In other words, the liquid crystal layer  15  may change or not change the vibration direction of the polarized light based on the application of the electric power to the first electrode  13  and the second electrode  14 . 
     When the first polarizing filter  11  is a vertical polarizing filter, and the second polarizing filter  18  is a horizontal polarizing filter, and when the liquid crystal molecule  15   a  is twisted and aligned in the spiral shape as shown in  FIG. 6 , the liquid crystal molecule  15   a  polarizes the light of the vertical direction passed through the first polarizing filter  11  in the horizontal direction. The light passed through the liquid crystal layer  15  and polarized in the vertical direction may pass through the second polarizing filter  18 , and thus, the light incident onto the liquid crystal layer  15  may be displayed by the display panel  10 . 
     When the first polarizing filter  11  is a vertical polarizing filter, and the second polarizing filter  18  is a horizontal polarizing filter, and the liquid crystal molecule  15   b  is not twisted as shown in  FIG. 7 , the liquid crystal layer  15  directly transmits the light polarized by the first polarizing filter  11  in the vertical direction, and thus, the light passed through the liquid crystal layer  15  is blocked by the second polarizing filter  18  which is a horizontal polarizing filter. Thus, the light passed through the liquid crystal layer  15  is not displayed by the display panel  10  to the outside. 
     The quantum dot sheet  16  may convert incident light having a predetermined color into light of a different color or output without converting into the light of the different color. Thus, the quantum dot sheet  16  may function to display various colors on the display panel  10 . 
     The quantum dot sheet  16  may be interposed between the second electrode  14  and the second substrate  17 . 
     Blue-based light, for example, may be incident onto the quantum dot sheet  16 , and the quantum dot sheet  16  may include a light transmitter  16   a  configured to transmit the incident blue-based light, at least one red light quantum dot unit  16   b  configured to convert the incident blue-based light and emit red-based light, and at least one green light quantum dot unit  16   c  configured to convert the incident blue-based light and emit green-based light. 
     The light transmitter  16   a  may directly transmit a part of the incident light for emission to the outside, or convert a color of a part of the incident light or disperse a part of the incident light for emission to the outside. In particular, the light transmitter  16   a , as illustrated in  FIGS. 1 and 2 , may disperse all or a part of the blue-based light and emit the dispersed light in a forward direction. Also, the light transmitter  16   a  may convert a part of the incident blue-based light into the green-based light and emit the converted in the forward direction. Thus, the light transmitter  16   a  may emit a mixed light including the blue-based light and the green-based light in a direction toward the second substrate  17 . In this case, green-based light may be also dispersed and emitted in the direction toward the second substrate  17 . 
     In particular, the light transmitter  16   a , as illustrated in  FIGS. 1 and 2 , may include a main body, and dispersion particles and converting units distributed in the main body. 
     The main body may be formed of a light transmitting material, and the light transmission material may include a material having a transparency of a predetermined level or greater, which may include a resin such as a natural resin or a synthetic resin, glass, and/or the like. 
     The dispersion particles disperse the incident blue light, and the blue light is emitted in a direction toward the second substrate  17 . Thus, the blue light passed through the second polarizing filter  18  and the second substrate  17  and emitted may be viewed in a viewing angle equal to the above described red light and green light or similar thereto. The dispersion particle may include zinc oxide, titanium oxide, silicon oxide, and/or the like. 
     The light converting unit may convert a color of the light incident onto the main body and emit. For example, when the incident light is blue-based light, the blue-based light may be converted into green-based light or red-based light and emitted. 
     In an exemplary embodiment, the light converting unit may include a green light converting unit configured to convert the blue-based light into the green-based light, and here, the green light converting unit may include at least one of a green quantum dot particle and a green fluorescent particle. 
     The red light quantum dot unit  16   b  may change a wavelength of the incident blue-based light using quantum dots, and emit the red-based light having a longer wavelength. The red light quantum dot unit  16   b  includes a plurality of red quantum dot particles, and a size of the red quantum dot particle in the red light quantum dot unit  16   b  is greater than that of the green quantum dot particle in the green light quantum dot unit  16   c.    
     The green light quantum dot unit  16   c  may change a wavelength of the incident blue-based light using quantum dots, and emit the green-based light having a longer wavelength than the blue-based light. The green light quantum dot unit  16   c  includes a plurality of green quantum dot particles, and a size of the green quantum dot particle in the green light quantum dot unit  16   c  is smaller than that of the red quantum dot particle in the red light quantum dot unit  16   b.    
     The red light quantum dot unit  16   b  and the green light quantum dot unit  16   c  may convert the blue-based light transmitted from the liquid crystal layer  15  into red or green colored light using quantum dots, and emit in the direction toward the second substrate  17 . In this case, the red light quantum dot unit  16   b  and the green light quantum dot unit  16   c  may change, disperse and emit the incident light. Thus, the red-based light or the green-based light passed through the second substrate  17  and the second polarizing filter  18  may be viewed in a relatively wide range. 
     The red light quantum dot unit  16   b  or the green light quantum dot unit  16   c  may have a predetermined size, and for example, may have a sufficient size to convert all amount of the blue-based light passed through the liquid crystal molecules of the liquid crystal layer  15  into the red-based light or the green-based light. 
     The light transmitter  16   a  may be relatively smaller than at least one of the red light quantum dot unit  16   b  and the green light quantum dot unit  16   c , and for example, the light transmitter  16   a  may be provided to have a relatively smaller width WB than at least one of the red light quantum dot unit  16   b  and the green light quantum dot unit  16   c . In other words, at least one of the red light quantum dot unit  16   b  and the green light quantum dot unit  16   c  may be provided so that at least one of an incident surface onto which light is incident and an emitting surface from which the light emits may be wider than at least one of the incident surface and the emitting surface of the light transmitter  16   a . For example, widths WR and WG of the red light quantum dot unit  16   b  and the green light quantum dot unit  16   c  may be relatively greater than the width WB of the light transmitter  16   a . Thus, because the red light quantum dot unit  16   b  and the green light quantum dot unit  16   c  are larger than the light transmitter  16   a , the red light quantum dot unit  16   b  and the green light quantum dot unit  16   c  may emit a greater amount of the red-based light and the green-based light than the light transmitter  16   a.    
     The light transmitter  16   a , the red light quantum dot unit  16   b , and the green light quantum dot unit  16   c , as illustrated in  FIG. 5 , may be disposed on a position corresponding to one group of liquid crystal molecules of the liquid crystal layer  15 . In particular, liquid crystal molecules of one group are provided to correspond to one of light transmitters  16   a , and liquid crystal molecules of another group are provided to correspond to one of the red light quantum dot units  16   b , and liquid crystal molecules of still another group are provided to correspond to one of the green light quantum dot units  16   c.    
     Even when the light transmitter  16   a  is relatively smaller than at least one of the red light quantum dot unit  16   b  and the green light quantum dot unit  16   c , the size of liquid crystal molecules of a corresponding row may be equal to the size of liquid crystal molecules of a row corresponding to at least one of the red light quantum dot unit  16   b  and the green light quantum dot unit  16   c . Thus, a part of the incident blue light may not be transmitted by the light transmitter  16   a , but may be blocked by a blocking wall, and/or the like and may not be emitted in the forward direction. Thus, the amount of blue light passed through the light transmitter  16   a  may be relatively smaller than at least one of the amount of red light and the amount of green light emitted from the red light quantum dot unit  16   b  and the green light quantum dot unit  16   c . Thus, a ratio of the amount of the blue light to the red light or the green light may be controlled. 
     In an exemplary embodiment, the red light quantum dot unit  16   b  and the green light quantum dot unit  16   c  may be disposed more in the quantum dot sheet  16  than in the light transmitter  16   a.    
     The light transmitter  16   a , the red light quantum dot unit  16   b , and the green light quantum dot unit  16   c  may be in contact with each other, or may be spaced apart from each other by a predetermined distance. When the light transmitter  16   a , the red light quantum dot unit  16   b , and the green light quantum dot unit  16   c  are spaced apart from each other, a blocking wall including a metal, a synthetic resin, a synthetic rubber, and/or the like may be provided therebetween. 
     The quantum dot sheet  16  may be installed on one surface of the second substrate  17  in the rearward direction, and the second polarizing filter  18  may be installed on one surface of the second substrate  17  in the forward direction. In particular, the red light quantum dot unit, the green light quantum dot unit, and the light transmitter may be respectively installed on the second substrate  17  in a predetermined pattern. In this case, the second substrate  17  may be divided into a plurality of unit areas, the red light quantum dot unit, the green light quantum dot unit, and the light transmitter may be installed in each unit area in the same pattern and each of the unit areas may operate as one pixel. 
     The second substrate  17  may be formed of a transparent material, and thus, the red light, the green light, and the blue light emitted from the quantum dot sheet  16  may pass therethrough. For example, the second substrate  17  may be manufactured using a synthetic resin such as an acrylic resin, glass, and/or the like. 
     An exemplary embodiment of the light transmitter  16   a , the red light quantum dot unit  16   b , and the green light quantum dot unit  16   c  disposed on the second substrate  17  will be described below. 
     The second polarizing filter  18  may be installed on one surface in the forward direction of the second substrate  17 , and polarize the incident light. In an exemplary embodiment, the second polarizing filter  18  may be a horizontal polarizing filter or a vertical polarizing filter. 
     The second polarizing filter  18  may be provided to have a polarizing axis different from that of the first polarizing filter  11 . In particular, the polarizing axis of the second polarizing filter  18  may be provided to cross the polarizing axis of the first polarizing filter  11  at a right angle. For example, when the first polarizing filter  11  is a vertical polarizing filter, the second polarizing filter  18  may be a horizontal polarizing filter. Thus, when a vibrating direction of the light passed through the first polarizing filter  11  is not changed, the light may not pass through the second polarizing filter  18 , and thus, the light is not emitted to the outside of the display panel. In contrast, when the light passed through the first polarizing filter  11  passes through the liquid crystal layer  15 , and the vibrating direction of the light is changed to be the same as the polarizing axis of the second polarizing filter  18 , the light may pass through the second polarizing filter  18 . In this case, the light may be emitted to the outside. 
     Thus, the second polarizing filter  18  may transmit or block the light passed through and emitted from the second substrate  17 , depending on a state of the LC layer. Thus, at least one of the light mixture TL of the blue-based light and the green-based light emitted from the light transmitter  16   a , red-based light RL emitted from the red light quantum dot unit  16   b , and green-based light GL emitted from the green light quantum dot unit  16   c  may be emitted to the outside or blocked. 
       FIG. 8  is a side view illustrating one example of size relations between a first electrode and a light transmitter, a red light quantum dot unit, and a green light quantum dot unit, and  FIG. 9  is a plan view illustrating the one example of the size relations between the first electrode and the light transmitter, the red light quantum dot unit, and the green light quantum dot unit. In the drawings of  FIGS. 8 and 9 , other components are omitted to show the relations between the first electrode  13  and the light transmitter  16   a , the red light quantum dot unit  16   b , and the green light quantum dot unit  16   c.    
     As described above, the second electrode  14  may be formed as a common electrode, and the first electrode  13  may be formed as a pixel electrode according to a predetermined pattern. 
     As will be described below, the light transmitter  16   a , the red light quantum dot unit  16   b , and the green light quantum dot unit  16   c  may form one pixel, and a plurality of pixels may be two-dimensionally arranged to form one image. For example, the first electrode  13  may include a first pixel electrode, a second pixel electrode, and a third pixel electrode, the first pixel electrode may be a blue pixel electrode, the second pixel electrode may be a green pixel electrode, and the third pixel electrode may be a red pixel electrode. 
     Referring to  FIGS. 8 and 9 , one pixel Px may include a blue pixel electrode  13 T corresponding to a blue color, a green pixel electrode  13 G corresponding to a green color, and a red pixel electrode  13 R corresponding to a red color. 
     The blue pixel electrode  13 T may apply an electric field corresponding to a blue color to a gap between the blue pixel electrode  13 T and the second electrode  14 , the green pixel electrode  13 G may apply an electric field corresponding to a green color to a gap between the green pixel electrode  13 G and the second electrode  14 , and the red pixel electrode  13 R may apply an electric field corresponding to a red color to a gap between the red pixel electrode  13 R and the second electrode  14 . 
     Because the pixel electrodes  13 T,  13 G, and  13 R apply the electric fields needed to realize colors thereof as described above, a size of the light transmitter  16   a  may correspond to the blue pixel electrode  13 T, a size of the green light quantum dot unit  16   c  may correspond to the green pixel electrode  13 G, and a size of the red light quantum dot unit  16   b  may correspond to the red pixel electrode  13 R, as illustrated in  FIGS. 8 and 9 . 
     Specifically, a width WB (see  FIG. 19 ) of the light transmitter  16   a  may not exceed a width of WB′ of the blue pixel electrode  13 T, a width WG (see  FIG. 19 ) of the green light quantum dot unit  16   c  may not exceed a width WG′ of the green pixel electrode  13 G, and a width WR (see  FIG. 19 ) of the red light quantum dot unit  16   b  may not exceed a width WR′ of the red pixel electrode  13 R. 
     Accordingly, light BL passing through the blue pixel electrode  13 T may pass through the light transmitter  16   a  and be emitted as blue light BL, the light BL passing through the green pixel electrode  13 G may pass through the green light quantum dot unit  16   c  and be emitted as green light GL, and the light BL passing through the red pixel electrode  13 R may pass through the red light quantum dot unit  16   b  and be emitted as red light RL. However, as described above, because the light transmitter  16   a  includes the green light quantum dot particles or the green fluorescent particles, a part of light incident on the light transmitter  16   a  may be converted into green light to emit blue light mixed with green-based light, or the light source  2  may convert a part of blue-based light into green-based light to emit the blue light mixed with the green-based light from the light transmitter  16   a.    
       FIG. 10  is a side view illustrating another example of size relations between a first electrode with a light transmitter, a red light quantum dot unit, and a green light quantum dot unit, and  FIG. 11  is a plan view illustrating another example of the size relations between the first electrode and the light transmitter, the red light quantum dot unit, and the green light quantum dot unit. In the drawings of  FIGS. 10 and 11 , other components are omitted to show the relations between the first electrode  13  and the light transmitter  16   a , the red light quantum dot unit  16   b , and the green light quantum dot unit  16   c.    
     In the above-described exemplary embodiments of  FIGS. 1 to 4 , because the light transmitter  16   a  includes the light converting unit  7   b , such as the green light quantum dot particles or the green fluorescent particles, or the light source  2  includes the light converter  2   d  configured to convert a part of blue-based light BLD into green-based light GL 0 , the blue light mixed with the green-based light may be emitted 
     According to the example of  FIGS. 10 and 11 , a width WG of the green light quantum dot unit  16   c  may extend to cover a part of the blue pixel electrode  13 T. For example, the width WG of the green light quantum dot unit  16   c  may extend in a range of 1 to 25% thereof toward the light transmitter  16   a . In addition, an area of 1 to 25% of the blue pixel electrode  13 T may be covered by the green light quantum dot unit  16   c . Because the width of the green light quantum dot unit  16   c  extends toward the blue pixel electrode  13 T, a width of the light transmitter  16   a  may decrease. 
     In this case, a part of the blue light BL passing through the blue pixel electrode  13 T may pass through the light transmitter  16   a  and be emitted as the blue light BL, and a part of the rest of the light BL may pass through the green light quantum dot unit  16   c  having the extended width WG and be emitted as the green light GL. That is, some of the blue light BL, which is included in a coverage of the green light quantum dot unit  16   c , of the blue light BL emitted by the light source  2  and passing through the blue pixel electrode  13 T is converted into the green light GL while passing through the green light quantum dot unit  16   c  and emitted. 
     Accordingly, as a result, light passing through the blue pixel electrode  13 T may be converted into and emitted as blue-based light with an added green color. That is, when an area from which light passing through the blue pixel electrode  13 T is emitted is referred to as a blue channel area, an area from which light passing through the green pixel electrode  13 G is emitted is referred to as a green channel area, and an area from which light passing through the red pixel electrode  13 R is emitted is referred to as a red channel area, the width of the green light quantum dot unit  16   c  extends to cover a part of the blue pixel electrode  13 T so that blue-based light mixed with green-based light may be emitted via the blue channel area. Even in this case, the descriptions of the other elements are the same as those described above. 
     For example, the light transmitter  16   a  may include a light transmitting material capable of transmitting all or part of incident light. Here, the light transmitting material may include a material, such as a resin, such as a natural resin or a synthetic resin, a glass, or the like, having a transparency greater than or equal to a predetermined level. The synthetic resin may include an epoxy resin, a urethane resin, polymethyl methacrylate (PMMA), or the like, and the glass may include silicate glass, borate glass, phosphate glass, or the like. Additionally, any material capable of transmitting various types of light may be used as the light transmitting material. 
     In addition, the dispersion particles configured to disperse the incident light in a predetermined range may be disposed in the light transmitting material. A material, such as a zinc oxide, a titanium oxide, and a silicon oxide, may be used as the dispersion particles. 
     In addition, the light transmitter  16   a  may also include a dye which absorbs red light or green light. For example, the dye included in the light transmitter  16   a  may transmit blue light and absorb light which is not the blue color. When the light transmitter  16   a  includes a dye which transmits blue light and absorbs red light and green light, the generation of artifacts due to reflection of external light may be reduced. 
     Even when the light transmitter  16   a  includes a dye, the dispersion particles may also be included therein to disperse incident light. 
       FIG. 12A  is a view illustrating color gamut for describing a color reproducing ratio by a display panel, and  FIG. 12B  is an enlarged view illustrating an area of the blue family in the color gamut of  FIG. 12A .  FIG. 12C  is a table illustrating an example of locations of red, green, and blue in the color gamut of  FIG. 12A .  FIG. 13A  is a view illustrating color gamut for describing a color reproducing ratio by a display panel using a light converter in a light converting unit or a light source, and  FIG. 13B  is an enlarged view illustrating an area of the blue family in the color gamut of  FIG. 13A .  FIG. 14  is a table illustrating an example of locations of red, green, and blue in the color gamut of  FIG. 13A . 
       FIGS. 12A, 12B, 13A and 13B  represent color gamuts, and respectively represent color areas A 1  and B 1  (hereinafter, a first color area) by sRGB, color areas A 2  and B 2  (hereinafter, a second color area) by DCI-P3, a color area A 3  (hereinafter, a third color area) which may be acquired using quantum dot sheets, and a color area B 3  (hereinafter, a fourth color area) which may be acquired by including the green light converting unit in the light transmitter  16   a  of the quantum dot sheet  16  of the display panel  10  or providing the light converter  2   d  (shown in  FIG. 3 ) in the light source. An inside of each of the triangles represents an area displayed by a color, and the outside of the triangles represent an area which is not displayable by a color. 
     Tables of  FIGS. 12C and 14  represent color coordinates in color gamuts of red R, green G, and blue B in each color gamut. 
     As described above, even when a blue LED is used as the light source in the case in which the light transmitter  16   a  of the quantum dot sheet  16  of the display panel  10  includes the green light converting unit, in the case in which the light source is provided with the light converter  2   d  (see  FIG. 3 ), or in the case in which the width of the green light quantum dot unit  16   c  extends to cover a part of the blue pixel electrode  13 T, because blue light itself emitted by the blue LED is not used and the blue light appropriately mixed with green light and is used to display a color of the blue family, color reproducibility for the blue family can be improved. 
     Specifically, when the blue light emitted by the blue LED directly passes though the light transmitter  16   a  and is emitted to the outside without an additional conversion process, a color thereof is difficult to accurately represent in sRGB color gamuts A 1  and B 1  or DCI-P3 color gamuts A 2  and B 2 , which are generally used for standard color coordinates. 
     As illustrated in  FIGS. 12A and 12B , a difference may occur between a third color gamut A 3 , which is acquirable using a display panel in which a quantum dot sheet is used, and the first color gamut A 1  or the second color gamut A 2 . In this case, a part of a gamut z 3  of the first color gamut A 1  or the second color gamut A 2  exists outside the third color gamut A 3 . 
     Thus, some of colors which may be represented in the sRGB color gamuts A 1  and B 1  or DCI-P3 color gamuts A 2  and B 2  may not be displayed by the display panel using the quantum dot sheet. In particular, the above problem is significant in a blue color as illustrated in  FIGS. 12A to 12C . Referring to  FIG. 12C , a y-axis coordinate representing a blue color B of the display panel using the quantum dot sheet is 0.019, and may be significantly different from a sRGB y-axis value 0.06 and a DCPI-P3 y-axis value 0.06 corresponding thereto, and thus, the blue color of the display panel using the quantum dot sheet may be more vaguely represented. 
     When the light transmitter  16   a  includes the green light converting unit, when the light source is provided with the light converter  2   d  (see  FIG. 3 ), or when the width of the green light quantum dot unit  16   c  extends to cover a part of the blue pixel electrode  13 T, as illustrated in  FIGS. 13A and 13B , the fourth color gamut B 3 , which is different from the third color gamut A 3  which may be acquired using the display panel using the quantum dot sheet, may be acquired. 
     Specifically, referring to  FIG. 14 , coordinates of red R and green G in the fourth color gamut B 3  are the same as those of red R and green G in the third color gamut A 3 , but coordinates of 0.153 and 0.051 of blue B in the fourth color gamut B 3  are different from coordinates of 0.157 and 0.019 of blue B in the third color gamut A 3 . In other words, the color gamut of the blue family is changed, and thus, color reproducibility of the blue family is also changed. 
     Referring to  FIGS. 13A and 13B , a part of the gamut Z 3  existing outside the third color gamut A 3  exists in the fourth color gamut B 3 . Thus, in the case of the display panel  10  in which the light transmitter  16   a  includes the green light converting unit or the light source includes the light converter, or in the case in which the width of the green light quantum dot unit extends to cover a part of the blue pixel electrode  13 T, a color which is not displayed when the display panel using the quantum dot sheet is used, that is, a color corresponding to a part of the gamut Z 3  may be displayed, thereby improving color reproducibility. 
     In addition, referring to  FIGS. 13A to 13B , the fourth color gamut B 3  covers most of first color gamuts A 1  and B 1  of the sRGB color gamuts A 1  and B 1 , and is also the same as or similar to second color gamuts A 2  and B 2  of the DCI-P3 color gamuts A 2  and B 2 . Thus, the display panel  10  according to one exemplary embodiment may display all or most of colors of the sRGB color gamuts A 1  and B 1  and the DCI-P3 color gamuts A 2  and B 2 . Thus, the most of the colors required for the display apparatus including the display panel using the quantum dot sheet may be naturally displayed. 
     Hereinafter, various examples in which a red light quantum dot unit, a green light quantum dot unit, and a light transmitter are disposed on a substrate will be described. 
       FIG. 15  is a view illustrating a first example of a structure in which a red light quantum dot unit, a green light quantum dot unit, and a light transmitter are disposed. 
     Referring to  FIG. 15 , the light transmitter  16   a  (T), the red light quantum dot unit  16   b  (R), and the green light quantum dot unit  16   c  (G) may be disposed in one area Z 0  of the second substrate  17  in a predetermined pattern. The one area Z 0  refers to one polarizing plate formed by combining the light transmitter  16   a , the red light quantum dot unit  16   b , and the green light quantum dot unit  16   c  or a portion of a substrate on which the light transmitter  16   a , the red light quantum dot unit  16   b , and the green light quantum dot unit  16   c  are disposed. 
     The one area Z 0  may be divided into a plurality of unit areas Z 1  to Z 9 , and a light transmitter  16   a , a red light quantum dot unit  16   b , and a green light quantum dot unit  16   c  may be disposed in each of the unit areas Z 1  to Z 9 . 
     Each of the unit areas Z 1  to Z 9  may form one pixel. The pixel refers to a minimum unit forming an image, and the image may be formed by aggregating light output from the pixels. In the one pixel, light of different colors may be output, and light of various colors may be expressed in one pixel by combining the light of different colors. 
     Patterns on which the light transmitter  16   a , the red light quantum dot unit  16   b , and the green light quantum dot unit  16   c  are disposed in each unit areas Z 1  to Z 9  may be substantially the same. In other words, the arrangement type in which the light transmitter  16   a , the red light quantum dot unit  16   b , and the green light quantum dot unit  16   c  are disposed in any one of the unit areas Z 1  to Z 9  may be the same as the arrangement type in which the light transmitter  16   a , the red light quantum dot unit  16   b , and the green light quantum dot unit  16   c  are disposed in different unit areas Z 1  to Z 9 . 
     The unit areas Z 1  to Z 9  may respectively include a plurality of sub areas Z 11  to Z 93 , and the light transmitter  16   a  may be disposed in at least one sub area Z 11 , Z 21 , Z 31 , Z 41 , Z 51 , Z 61 , Z 71 , Z 81 , and Z 91  among the plurality of sub areas Z 11  to Z 93 , and at least one of the red light quantum dot unit  16   b  and the green light quantum dot unit  16   c  may be disposed in different sub areas Z 12 , Z 13 , Z 22 , Z 23 , Z 32 , Z 33 , Z 42 , Z 43 , Z 52 , Z 53 , Z 62 , Z 63 , Z 72 , Z 73 , Z 82 , Z 83 , Z 92 , and Z 93 . 
     Each of the unit areas Z 1  to Z 9 , as illustrated in  FIG. 15 , may include three sub areas among the sub areas Z 11  to Z 93 , and the light transmitter  16   a , the red light quantum dot unit  16   b , and the green light quantum dot unit  16   c  may be sequentially disposed in each of the sub areas Z 11  to Z 93  in a predetermined sequence. In this case, the sequence of arranging the light transmitter  16   a , the red light quantum dot unit  16   b , and the green light quantum dot unit  16   c  may vary according to one or more exemplary embodiments. 
     When the light transmitter  16   a , the red light quantum dot unit  16   b , and the green light quantum dot unit  16   c  are disposed in each of the unit areas Z 1  to Z 9  and the blue light is incident onto the light transmitter  16   a , the red light quantum dot unit  16   b , and the green light quantum dot unit  16   c , the blue light, red light, and green light may be emitted in each of the unit areas Z 1  to Z 9 . The emitted blue light, the red light, and the green light may solely form a color, or form a color by combining two or more kinds of colored light. Thus, each of the unit areas Z 1  to Z 9  may emit light of various colors. 
       FIG. 16  is a view illustrating a second example of a structure in which a red light quantum dot unit, a green light quantum dot unit, and a light transmitter are disposed. In  FIG. 16 , only one unit area Z 1  is described, but the red light quantum dot unit, the green light quantum dot unit, and the light transmitter may be disposed in different unit areas Z 2  to Z 9  as illustrated in  FIG. 15 . 
     As illustrated in  FIG. 16 , one unit area Z 1  may include more than three sub areas. For example,  FIG. 16  illustrates six sub areas Z 11  to Z 16  separated from each other and arranged in two rows of three sub areas. 
     At least one of the light transmitter  16   a , red light quantum dot units  16   b   1  and  16   b   2 , and green light quantum dot units  16   c   1 ,  16   c   2 , and  16   c   3  may be disposed in the sub areas Z 11  to Z 16 . 
     In an exemplary embodiment, as illustrated in  FIG. 16 , at least one of the red light quantum dot units  16   b   1  and  16   b   2 , and the green light quantum dot units  16   c   1 ,  16   c   2 , and  16   c   3  may be disposed in a greater number than the light transmitter  16   a . For example, one light transmitter  16   a  may be disposed in one unit area Z 1 , and two red light quantum dot units  16   b   1  and  16   b   2  may be disposed in the unit area Z 1 , and three green light quantum dot units  16   c   1 ,  16   c   2 , and  16   c   3  may be disposed in the unit area Z 1 . 
     The light transmitter  16   a , the red light quantum dot units  16   b   1  and  16   b   2 , and the green light quantum dot units  16   c   1 ,  16   c   2 , and  16   c   3  installed in respective sub areas Z 11  to Z 16  may be in contact with each other, and may be separated from each other by a predetermined distance. 
     The light transmitter  16   a , the red light quantum dot units  16   b   1  and  16   b   2 , and the green light quantum dot units  16   c   1 ,  16   c   2 , and  16   c   3  may be disposed in various arrangements based on a particular design. For example, as illustrated in  FIG. 16 , the light transmitter  16   a  may be disposed in the first sub area Z 11 , and the green light quantum dot units  16   c   1 ,  16   c   2 , and  16   c   3  may be disposed in the second sub area Z 12 , the fourth sub area Z 14 , and the fifth sub area Z 15 , and the red light quantum dot units  16   b   1  and  16   b   2  may be disposed in the third sub area Z 13  and the sixth sub area Z 16 . 
     Areas of the first red light quantum dot unit  16   b   1 , the second red light quantum dot unit  16   b   2 , the first green light quantum dot unit  16   c   1 , the second green light quantum dot unit  16   c   2 , the third green light quantum dot unit  16   c   3 , and the light transmitter  16   a  may be the same, or some of the areas may be different from each other, or all of the areas may be different from each other. The difference of sizes thereof may be determined according to a ratio of amounts of the emitted red light, the green light, and the blue light. For example, when an amount of the emitted green light may be smaller than amounts of the different red light and the blue light, the green light quantum dot units  16   c   1 ,  16   c   2 , and  16   c   3  emitting the green light may be disposed in the unit area Z 1  in a greater number than the red light quantum dot units  16   b   1  and  16   b   2  and the light transmitter  16   a.    
     In another exemplary embodiment, the number of the red light quantum dot units  16   b   1  and  16   b   2  and the green light quantum dot units  16   c   1 ,  16   c   2 , and  16   c   3  disposed in the unit area Z 1  may be equal to the number of the light transmitters  16   a  disposed in the unit area Z 1 . 
     Although various examples are described above, the light transmitter  16   a , the red light quantum dot unit  16   b , and the green light quantum dot unit  16   c  may be disposed on the second substrate  17  in various arrangements, and the arrangement is not limited to the above-discussed examples. 
       FIG. 17  is a view illustrating a third example of a structure in which a red light quantum dot unit, a green light quantum dot unit, and a light transmitter are disposed, and  FIG. 18  is a view illustrating a fourth example of a structure in which a red light quantum dot unit, a green light quantum dot unit, and a light transmitter are disposed. 
     Referring to  FIG. 17 , a light transmitter  16   a , a red light quantum dot unit  16   b , and a green light quantum dot unit  16   c  may be disposed in one area z 0  of a second substrate  17  on the basis of a predetermined pattern as described above with reference to  FIG. 15 . Here, as illustrated in  FIGS. 10 and 11 , the green light quantum dot unit  16   c  may also be disposed to extend toward the light transmitter  16   a  to cover a part of an area of a blue pixel electrode  13 T. 
     In this case, even when the light transmitter  16   a  does not include a green light converting unit or when a light converter is not provided in a light source, a part of light passing through the blue pixel electrode  13 T passes through the green light quantum dot unit  16   c , and light in which green-based light and blue-based light are mixed may be emitted from a blue channel area. 
     Referring to  FIG. 18 , as described six sub areas z 11  to z 16 , which are divided, and the six areas may be arranged into two rows, each of which includes three sub areas. 
     At least one among the light transmitter  16   a , the red light quantum dot units  16   b   1  and  16   b   2 , and the green light quantum dot units  16   c   1 ,  16   c   2 , and  16   c   3  may be disposed in each of the sub areas z 11  to z 16 . Here, as illustrated in  FIGS. 10 and 11 , the green light quantum dot unit  16   c  may also be disposed to extend toward the light transmitter  16   a  to cover a part of an area of the blue pixel electrode  13 T. 
     In this case, as described above, even when the light transmitter  16   a  does not include the green light converting unit or when the light converter is not provided in the light source, a part of light passed through the blue pixel electrode  13 T may pass through the green light quantum dot unit  16   c , and thus the light in which the green-based light and the blue-based light are mixed may be emitted from the blue channel area. 
       FIG. 19  is a side cross-sectional view illustrating another exemplary embodiment of a display panel 
     As illustrated in  FIG. 19 , a display panel  10  may include a first polarizing filter  11 , a first substrate  12 , a first electrode  13 , a second electrode  14 , a liquid crystal layer  15 , a quantum dot sheet  16 , a filtering part  16   e , a second substrate  17 , and a second polarizing filter  18 . 
     Because the first polarizing filter  11 , the first substrate  12 , the first electrode  13 , the second electrode  14 , the liquid crystal layer  15 , the quantum dot sheet  16 , the second substrate  17 , and the second polarizing filter  18  have already been described, the detail descriptions thereof will be omitted. 
     The filtering part  16   e  may filter some of light emitted from the quantum dot sheet  16 . 
     Specifically, the filtering part  16   e  may be in contact with at least one emitting surface of a red light quantum dot unit  16   b  and a green light quantum dot unit  16   c . In this case, the filtering part  16   e  may also be disposed on each of the red light quantum dot unit  16   b  and the green light quantum dot unit  16   c , and when the filtering part  16   e  is disposed on each of the red light quantum dot unit  16   b  and the green light quantum dot unit  16   c , one filtering part  16   e  may be disposed on both of the red light quantum dot unit  16   b  and the green light quantum dot unit  16   c.    
     According to one exemplary embodiment, the filtering part  16   e  may include a blue light cut-off filter configured to filter blue-based light. A cut-off filter is a filter configured to filter light in a predetermined wavelength range and transmit the remaining light, which is not in the predetermined wavelength range, and a blue light cut-off filter is a filter configured to filter blue-based light and transmit green-based light or red-based light. The filtering part  16   e  may be formed in a film form. 
     The red light quantum dot unit  16   b  and the green light quantum dot unit  16   c  may emit some of the blue-based light. Specifically, some of the blue-based light incident on the red light quantum dot unit  16   b  may not encounter a red light quantum dot particles, may pass through the red light quantum dot unit  16   b , and may be emitted. In this case, the transmitted blue-based light may affect a color of red-based light emitted from the red light quantum dot unit  16   b , thereby decreasing color reproducibility. Because the filtering part  16   e  is disposed on the emitting surface of the red light quantum dot unit  16   b , the filtering part  16   e  may remove the blue-based light emitted from the red light quantum dot unit  16   b  to allow the red-based light to be emitted from the red light quantum dot unit  16   b . Similarly, the filtering part  16   e  may remove the blue-based light emitted from the green light quantum dot unit  16   c  to allow green-based light to be emitted from the green light quantum dot unit  16   c.    
     Hereinafter, various exemplary embodiments of display apparatuses used in display panels will be described with reference to  FIGS. 20 to 29 . 
       FIG. 20  is a perspective view illustrating an exterior of an exemplary embodiment of a display apparatus. 
     As illustrated in  FIG. 20 , a display apparatus  90  may include an external housing  91 , an image display part  97 , a support  98 , and a leg  99 . 
     The external housing  91  forms an exterior of the display apparatus  90 , and includes components configured to display various images by the display apparatus  90  or perform various operations thereof. The external housing  91  may be integrally formed, and may be a combination of a plurality of housings, for example, a front housing  101  (shown in  FIG. 22 ) and a rear housing  102  (shown in  FIG. 22 ). A middle housing  103  (shown in  FIG. 22 ) may be further provided in the external housing  91 . 
     The image display part  97  may be installed on a front of the external housing  91  and display various images to the outside. In particular, the image display part  97  may display at least one of a still image or moving image. The image display part  97  may be realized using a display panel  95 , and may include additional parts such as a touch panel, and/or the like. 
     The support  98  supports the external housing  91  and serves to connect the external housing  91  to the leg  99 . The support  98  may have various shapes or omitted. The support  98 , according to requirements, may be attached to or detached from the external housing  91 . 
     The leg  99  is connected to the support  98  and the external housing  91  may be stably disposed on a floor. The leg  99 , according to requirements, may be combined with or separated from the support  98 . The leg  99  may be directly connected to the external housing  91 . The leg  99  may be omitted in some exemplary embodiments. 
       FIG. 21  is a structural view illustrating an exemplary embodiment of a display apparatus. 
     As shown in  FIG. 21 , a display apparatus  90 , in an exemplary embodiment, may include a controller  92 , a power supply part  93 , a backlight unit  94 , and a display panel  95 . 
     The controller  92  may control the power supply part  93 , the display panel  95 , and/or the like, and thus, the display panel  95  may display a predetermined still image or moving image. The controller  92  may be realized by a processor, and the processor may be realized using one or more semiconductor chip and various components configured to operate the semiconductor chip. Meanwhile, the display apparatus  90  may further include a storage device configured to store various types of data in order to support the operation of the processor, and the storage media may be realized using semiconductor storage devices such as a random-access memory (RAM) or read-only memory (ROM), magnetic disk storage devices such as a hard disk, and/or the like. 
     The power supply part  93  may supply electric power required to output a predetermined image to the backlight unit  94 , the display panel  95 , and/or the like. The power supply part  93  may be electrically connected to an external commercial power source  96 . The power supply part  93  may rectify an alternating current (AC) power source from the external commercial power source  96  into a direct current (DC) power source required to operate the display apparatus  90 , or change a voltage to a required level, or perform an operation of removing noise from the DC power source. In some exemplary embodiments, the power supply part  93  may include a battery capable of storing electric power. 
     The backlight unit  94  generates light based on input electric power, and radiates the light in a direction toward the display panel  95 . The backlight unit  94  may be realized using a light emitting unit such as a light emitting diode (LED) configured to emit light based on applied power, and may further include a diffusion sheet, a light guide plate, and/or the like, and thus, the emitted light is sufficiently incident onto all of a surface of the display panel  95 . When the display panel  95  is a self-emissive type such as an organic light emitting diode (OLED) display panel, the backlight unit  94  may be omitted. The detailed description of the backlight unit  94  will be described below. 
     The display panel  95  may generate an image using the incident light. In some exemplary embodiments, the display panel  95  may control emitting light using liquid crystals, and also, the display panel  95  may further use a quantum dot sheet  118  (shown in  FIG. 18 ) and emit light of a particular color. Also, the display panel  95  may generate and emit light by itself, and, in this case, the backlight unit  94  may be omitted. When the display panel  95  is a self-emissive type, the display panel  95  may use an OLED or an active matrix OLED and generate light in the self-emissive type. The detailed description of the display panel  95  will be described below. 
       FIG. 22  is an exploded perspective view illustrating a first exemplary embodiment of a display apparatus, and  FIG. 23  is a side cross-sectional view illustrating the first exemplary embodiment of the display apparatus.  FIG. 24  is a view illustrating a blue light emitting diode illumination lamp as an exemplary embodiment of a light source of the display apparatus, and  FIG. 25  is a side cross-sectional view illustrating a display panel according to a first exemplary embodiment of the display apparatus. Hereinafter, for convenience of description, upward directions of  FIGS. 22 and 23  are referred to as forward directions, and downward directions of  FIGS. 22 and 23  are referred to as rearward directions. 
     In the first exemplary embodiment, the display apparatus  100 , as illustrated in  FIGS. 22 and 23 , may include housings  101  and  102  configured to form an exterior, a display panel  110  configured to generate an image, and a backlight unit (BLU)  120  configured to supply light to the display panel  110 . 
     In an exemplary embodiment, the housings  101  and  102  may include a front housing  101  installed in the forward direction, a rear housing  102  installed in the rearward direction, and the display panel  110  may include a second polarizing filter  111 , a second substrate  112 , a quantum dot sheet  118 , a second electrode  113 , a first electrode  115 , a first substrate  116 , and a first polarizing filter  117 , and the BLU  120  may include an optical plate  121 , a diffusion plate  125 , a reflecting plate  130 , and a light emitter  140 . According to one or more exemplary embodiments, one or more of the above-discussed elements may be omitted, and also additional components, for example, a touch screen panel, and/or the like may be added. 
     The front housing  101  may be disposed in the most forward direction of the display apparatus  100 , and form an exterior of a front surface and a side surface of the display apparatus  100 . The front housing  101  may be combined with the rear housing  102  to include and fix various types of components of the display apparatus  100  in the display apparatus  100 . The front housing  101  may stabilize the various components included in the display apparatus  100 , and simultaneously protect the components from a direct impact of the outside. 
     The front housing may include a fixing part  101   b  forming a bezel and a side part  101   a  extending from an end portion of the fixing part  101   b  in a direction toward the rear housing  102 . An opening  101   c  is defined by the front of the front housing  101 . 
     The side part  101   a  may be combined with the rear housing  102 , and the front housing  101  may be combined with the rear housing  102 . The side part  101   a  may fix various types of components in the display apparatus  100 , and protect the various types of components included in the display apparatus  100  from an impact transmitted in a sideward direction. 
     The fixing part  101   b  may protrude in a direction toward the opening  101   c , and fix various types of components such as the second polarizing filter  111 , the second substrate  112 , and the quantum dot sheet  118 , and prevent the dislocation of the various types of components to the outside or partial exposure thereof. 
     The image formed by the light passed through the second polarizing filter  111  is displayed through the opening  101   c , and thus, a user may view the image. 
     The rear housing  102  may be disposed in the rearmost direction of the display apparatus  100 , and may form an exterior of the rear surface and the side surface of the display apparatus  100 . The rear housing  102  may be combined with the front housing  101 , and the various types of components of the display apparatus  100  are included in the display apparatus  100 . In some exemplary embodiments, the front housing  101  and the rear housing  102  may be integrally formed. 
     The light emitter  140  and the reflecting plate  130  may be fixedly installed on an inside surface of the rear housing  102 . 
     The light emitter  140  may include a light source  142  for emitting light and a third substrate  141  on which the light source  142  is mounted. 
     A plurality of the light sources  142  may be installed on the third substrate  141  in a predetermined pattern. For example, the plurality of light sources  142  may be installed on the third substrate  141  in a straight-line form or various forms. Also, according to another example, only one light source  142  may be installed on the third substrate  141 . A driving power line configured to supply a driving power to the light source  142 , and/or the like may be formed on the third substrate  141 , and the light source  142  may be connected to a signal cable and a backlight driving circuit through the driving power line. The third substrate  141  may be manufactured using various materials such as a synthetic resin, and/or the like, and in some exemplary embodiments, may include a transparent material such as a poly methylmethacrylate resin, a glass plate, and/or the like. 
     The light sources  142  may be arranged and installed on the third substrate  141  in a predetermined pattern, and at least one thereof may be provided. In this case, the predetermined pattern in which the light sources  142  are disposed may correspond to the arrangement pattern of quantum dot units in the quantum dot sheet  118 . However, the arrangement pattern of the light source  142  is not limited thereto, and the light sources  142  may be disposed on the third substrate  141  in various patterns. 
     The light source  142  may radiate light of a predetermined color in various directions. Here, the light of the predetermined color may include blue-based light. The blue-based light may have a wavelength in a range of 400 nm to 500 nm, and refers to light optically viewed as a blue color. In order to emit the blue-based light, the light source  142  may be realized using a blue light emitting diode. 
     The light source  142 , for example, may include a light bulb, a halogen lamp, a fluorescent lamp, a sodium lamp, a mercury lamp, a fluorescent mercury lamp, a xenon lamp, an arc illumination lamp, a neon tube lamp, an EL lamp, an LED lamp, and/or the like, and additionally, various illumination devices may be included in the light source  142 . 
     Hereinafter, an example of the light source  142  will be described in detail. 
     In an exemplary embodiment, as illustrated in  FIG. 24 , the light source  142  may include a light emitting unit  144  and a transparent body  145 . 
     The light emitting unit  144  may include a positive electrode frame  144   a , an LED reflecting plate  144   b , a negative electrode frame  144   c , and a light emitting chip. 
     The positive electrode frame  144   a  and the negative electrode frame  144   c  are electrically connected to external electric power through portions  146   a  and  146   b  exposed to the outside, respectively. When the external electric power is applied, a current flows from the positive electrode frame  144   a  to the negative electrode frame  144   c  through the light emitting chip installed on the negative electrode frame  144   c  with the LED reflecting plate  144   b.    
     The light emitting chip may be realized using a PN junction diode. The light emitting chip may be electrically connected to the positive electrode frame  144   a  and the negative electrode frame  144   c  through a plurality of electrodes, and generate and emit light based on the current applied to the positive electrode frame  144   a  and the negative electrode frame  144   c . In this case, the emitted light may be the blue-based light. In an exemplary embodiment, the light emitting chip may be realized using gallium nitride (GaN), aluminum gallium nitride (AlGaN), indium gallium nitride (InGaN), and/or the like. The light emitting chip may be installed on an inner surface of the LED reflecting plate  144   b.    
     The LED reflecting plate  144   b  may reflect light emitted from the light emitting chip, and the emitted light may proceed in a predetermined direction. For example, the LED reflecting plate  144   b  may move the light in a direction toward the transparent body  145 . The LED reflecting plate  144   b  may be formed of a material capable of easily reflecting the light emitted from the light emitting chip. 
     The transparent body  145  may be formed of a material capable of transmitting light such as a synthetic resin, acrylic resin, etc., glass, and/or the like, and may be manufactured in various shapes. In particular, as illustrated in  FIG. 24 , the transparent body  145  may have a shape of a semi-sphere formed on a cylinder. A lens may be provided on one end of the transparent body  145 , and the lens may have the hemispherical shape. 
     The positive electrode frame  144   a , the LED reflecting plate  144   b , the negative electrode frame  144   c , the light emitting chip, and/or the like may be fixedly installed in an inner space  143  of the transparent body  145 . 
     In an exemplary embodiment, a light converter  145   a  configured to convert a color of the emitted light into a different color may be provided in the transparent body  145 . 
     As described above, the light converter  145   a  may include a green light converting unit, and the green light converting unit, for example, may include a green quantum dot particle or a green fluorescent particle. The green quantum dot particle or the green fluorescent particle may float in the inner space  143  of the transparent body  145  in the form of a droplet. 
     The green quantum dot particle, as described above, refers to a semiconductor crystal having a size of about 2 nm to 3 nm, and the green fluorescent particle changes a wavelength of the incident light to convert light of a predetermined color into green-based light. In an exemplary embodiment, the green fluorescent particle may include a green fluorescent body having a maximum width of 540 nm or less. 
     In an exemplary embodiment, all of the green quantum dot particles and the green fluorescent particles may be used as the green light converting unit, and in this case, the green quantum dot particles and the green fluorescent particles may exist in the transparent body  145  at a predetermined ratio, which may vary according to various exemplary embodiments. 
     When the blue-based light is emitted from the light emitting chip, the light converter  145   a  may convert a part of blue-based light into the green-based light, and thus, as illustrated in  FIG. 4 , the light source  142  may emit a mixture of the blue-based light and the green-based light. Thus, the light L emitted from the light source  142  by the light converter  145   a  may be closer to a green color than the blue-based light emitted from a blue light emitting diode. Thus, as described above, color reproducibility generated by the color of the light emitted from the blue light emitting diode may be improved. 
     As illustrated in  FIG. 25 , in some exemplary embodiments, the light converter  145   a  may be omitted. In this case, the above light converting unit may be provided in the light transmitter  118   a.    
     The light radiated from the light source  142  may be directly radiated in the forward direction which is a direction toward the diffusion plate  125 , or reflected by the reflecting plate  130  and then radiated in the forward direction. 
     The reflecting plate  130  may be installed on the rear housing  102 , and reflect the light, which is emitted from the light source  142  and proceeds in the rearward direction or the sideward direction, in the forward direction or a similar direction thereto. 
     In an exemplary embodiment, at least one through-hole  132  into which the light source  142  is inserted and installed may be provided through the reflecting plate  130 , and in this case, the light source  142  may be installed by being inserted into the through-hole  132  in the rearward direction of the reflecting plate  130  and is exposed in a direction toward a reflecting surface  131 . Also, in some exemplary embodiments, the through-hole  132  may not be installed through the reflecting plate  130 , and in this case, the light source  142  may be installed on the reflecting surface  131  of the reflecting plate  130 , and may be installed on an additional substrate including a transparent material which transmits light. 
     The reflecting plate  130  may be manufactured using a synthetic resin such as polycarbonate (PC), polyethylene terephthalate (PET), and/or the like, and also, may be manufactured with various metals. Additionally, the reflecting plate  130  may be manufactured with various materials. 
     At least one optical plate  121  and at least one diffusion plate  125  may be provided in the forward direction of the reflecting plate  130 . The light emitted from the light source  142  or the light reflected from the reflecting plate  130  may be incident onto at least one diffusion plate  125 . 
     The diffusion plate  125  may serve to diffuse incident light. The diffusion plate  125  may diffuse the incident light and disperse the light radiated from the light source  142  in various directions. The light radiated from the light source  142  may pass through the diffusion plate  125  and be incident onto the optical plate  121 . 
     The optical plate  121 , for example, may include at least one diffusion sheet  122 , at least one prism sheet  123 , and at least one protection sheet  124 . The diffusion sheet  122 , the prism sheet  123 , and the protection sheet  124  may be formed in a film shape. 
     The diffusion sheet  122  may serve to offset a pattern of the diffusion plate  125 . Because the light dispersed by the diffusion plate  125  is directly incident onto the eyes, the pattern of the diffusion plate  125  is viewed by the eyes, and thus, the diffusion sheet  122  may offset or minimize the pattern of the diffusion plate  125 . 
     The prism sheet  123  may refract the light diffused by the diffusion sheet  122  and the light is incident onto the first substrate  116  in the vertical direction. Prisms may be arranged on one surface of the prism sheet  123  in a predetermined pattern. In an exemplary embodiment, a plurality of the prism sheets  123  may be provided. 
     The protection sheet  124  may be disposed adjacent to the first polarizing filter  117 , and protect the diffusion sheet  122 , the prism sheet  123 , and/or the like from an external impact or contaminants. 
     The optical plate  121 , as described above, may be formed to include the diffusion sheet  122 , the prism sheet  123 , and the protection sheet  124 , or may be formed by omitting one or more of them, or may be formed to include more sheets additionally. Also, the optical plate  121  may be formed using a complex sheet in which functions of the above sheets are included. 
     The light passed through the optical plate  121  may be incident onto the first polarizing filter  117 . 
     The middle housing  103  may be provided between the optical plate  121  and the first polarizing filter  117 . The middle housing  103  may fix the BLU  120 , or partition the display panel  110  from the BLU  120 . The middle housing  103  may include a protrusion protruding in a direction toward the display panel  110  and the BLU  120 , and the BLU  120  may be fixed by the protrusion. The middle housing  103  may be integrally formed with the front housing  101  or the rear housing  102 . The middle housing  103  may be omitted in some exemplary embodiments. 
     The first polarizing filter  117  may polarize light incident onto the first substrate  116  from the light source  142 , and the light vibrating in the same direction as a predetermined polarizing axis may be incident onto the first substrate  116 . One surface of the first polarizing filter  117 , as illustrated in  FIGS. 22 and 23 , may be in contact with or adjacent to a rear surface of the first substrate  116 . The first polarizing filter  117  may be formed in a film shape. In an exemplary embodiment, the first polarizing filter  117  may include a vertical polarizing filter or a horizontal polarizing filter. Here, the vertical direction refers to a direction parallel with a line segment vertically passing through an upper interface and a lower interface of the display apparatus, and the horizontal direction refers to a direction parallel with the upper interface and the lower interface. 
     The first electrode  115  may be installed on one surface of the first substrate  116  in the forward direction, and the first polarizing filter  117  may be installed on one surface in the rearward direction. The first substrate  116  may be formed of a transparent material through which the light passed through the first polarizing filter  117  in the rearward direction is transmitted. For example, the first substrate  116  may be realized using a synthetic resin such as an acrylic resin, and/or the like, or glass and/or the like. The first substrate  116 , in some exemplary embodiments, may include a FPCB. 
     The first electrode  115  may apply a current to a liquid crystal layer  114  along with the second electrode  113  to adjust an arrangement of the liquid crystal molecules  114   a  in the liquid crystal layer  114 . According to the arrangement of the liquid crystal molecules  114   a , the display panel  110  may display various images. 
     In an exemplary embodiment, the first electrode  115  may be realized using a TFT. The first electrode  115  may be connected to external electric power, and receive electric power. A plurality of the first electrodes  115  may be installed on the first substrate  116 , and the first electrodes  115  may be installed on the first substrate  116  in a predetermined pattern. The pattern of the first electrodes  115  may vary according to one or more exemplary embodiments. 
     The second electrode  113  may be provided to correspond to the first electrode  115  with respect to the liquid crystal layer  114 , and may serve to apply a current to the liquid crystal layer  114  along with the first electrode  115 . One surface of the second electrode  113  in the forward direction may be in contact with the quantum dot sheet  118 , and one surface in the rearward direction may be in contact with or adjacent to the liquid crystal layer  114 . The second electrode  113  may be a common electrode. 
     The liquid crystal layer  114  may be provided between the second electrode  113  and the first electrode  115 , and the liquid crystal layer  114  may include a plurality of liquid crystal molecules  114   a.    
     The liquid crystal molecules  114   a , as described above, may be arranged in a plurality of columns in the liquid crystal layer  114 , and may be aligned in a predetermined direction or twisted in a spiral shape based on an electrical field. 
     When the liquid crystal molecules  114   a  are aligned in a straight line, a vibration direction of the light polarized by the first polarizing filter  117  is not changed and the light passes through the liquid crystal layer  114 , and when the liquid crystal molecules  114   a  are twisted and arranged in the spiral shape, the vibration direction of the polarized light is converted in a direction perpendicular into an original vibration direction and the light passes through the liquid crystal layer  114 . When a polarizing axis of the second polarizing filter  111  is different from that of the first polarizing filter  117 , the light passed through the liquid crystal layer  114  without the change of the vibration direction may not pass through the second polarizing filter  111 , and the light passed through the liquid crystal layer  114  and polarized in the horizontal direction may pass through the second polarizing filter  111 . A part of the light passed through the liquid crystal layer  114  may pass through the second polarizing filter  111  and be emitted to the outside, but the remaining light may be blocked by the second polarizing filter  111  and may not be emitted to the outside. 
     The quantum dot sheet  118  may convert the incident light of a predetermined color into a different color, or may output without converting into the different color. When blue-based light is incident, the quantum dot sheet  118  may directly transmit and emit the blue-based light, or may convert the blue-based light into red-based light or green-based light and emit the converted light. By the quantum dot sheet  118 , the display panel  110  may emit light of various colors to the outside, and thus, the display apparatus  100  may display various colors on a screen. 
     One surface of the quantum dot sheet  118  in the rearward direction, in an exemplary embodiment, may be provided to contact the second electrode  113 , and one surface in the forward direction may be in contact with the second substrate  112 . 
     The quantum dot sheet  118  may include a light transmitter  118   a  configured to transmit the blue-based light, at least one red light quantum dot unit  118   b  configured to convert the incident blue-based light into red light, and at least one green light quantum dot unit  118   c  configured to convert the incident blue-based light into green light. 
     The light transmitter  118   a , the red light quantum dot unit  118   b , and the green light quantum dot unit  118   c , as illustrated in  FIG. 19 , may be provided to correspond to one group of liquid crystal molecules of the liquid crystal layer  114 . In particular, one group of liquid crystal molecules  114   a  may be provided to correspond to one light transmitter  118   a , and another group of liquid crystal molecules  114   a  may be provided to correspond to one red light quantum dot unit  118   b , and still another group of liquid crystal molecules  114   a  may be provided to correspond to one green light quantum dot unit  118   c.    
     The light transmitter  118   a  may not change a part of the incident blue-based light, and directly emit to the outside, and another part may be converted into the green-based light and emitted. In particular, the light transmitter  118   a  may include a main body and light converting units disposed in the main body, and in an exemplary embodiment, may further include dispersion particles disposed in the main body. 
     The light converting unit may change the color of the light incident onto the main body and emit in a direction toward the second substrate  112 . For example, when the incident light is the blue-based light, the light converting unit may convert the blue-based light into the green-based light or the red-based light and emit. In an exemplary embodiment, the light converting unit may include the green light converting unit configured to convert the blue-based light into the green-based light, and here, the green light converting unit may include at least one of the above green quantum dot particle and the green fluorescent particle. The light converting unit may be omitted when the light converter  145   a  is provided in the light source  142 . 
     The dispersion particle may disperse the incident blue-based light and emit in a direction toward the second substrate  112 . Thus, the blue light transmitted and emitted from the second polarizing filter  111  and the second substrate  112  may be dispersed similar to the above-discussed red-based light and the green-based light, and may be viewed in a viewing angle similar thereto. The dispersion particle may use zinc oxide, titanium oxide, silicon oxide, and/or the like. 
     Because the converting unit and the dispersion particle are described with reference to  FIGS. 1 and 2 , the detailed description thereof will be omitted. 
     The red light quantum dot unit  118   b  and the green light quantum dot unit  118   c  may convert the blue-based light radiated from the light source  142  using a quantum dot into the red-based light or green-based light, and emit in a direction toward the second substrate  112 . The quantum dot of the red light quantum dot unit  118   b  may be relatively larger than the quantum dot of the green light quantum dot unit  118   c . The light emitted from the red light quantum dot unit  118   b  and the green light quantum dot unit  118   c  may be dispersed and emitted. 
     The light transmitter  118   a  may be relatively smaller than at least one of the red light quantum dot unit  118   b  and the green light quantum dot unit  118   c . For example, the light transmitter  118   a  may have a width smaller than at least one of the red light quantum dot unit  118   b  and the green light quantum dot unit  118   c.    
     The light transmitter  118   a , the red light quantum dot unit  118   b , and the green light quantum dot unit  118   c  may be in contact with each other, or may be spaced apart from each other by a predetermined distance. When the light transmitter  118   a , the red light quantum dot unit  118   b , and the green light quantum dot unit  118   c  are spaced apart from each other, a partition wall may be provided therebetween. 
     The red light quantum dot unit  118   b  and the green light quantum dot unit  118   c  may be provided in a larger number in the quantum dot sheet  118  than in the light transmitter  118   a . For example, as described above, the red light quantum dot unit  118   b  and the green light quantum dot unit  118   c  may be disposed in a larger number than in the light transmitter  118   a  in at least one unit area in the quantum dot sheet  118 . 
     The red light quantum dot unit  118   b , the green light quantum dot unit  118   c , and the light transmitter  118   a  are already described above, and thus, the detailed description thereof will be omitted. 
     In an exemplary embodiment, a filtering part  118   d  configured to filter a part of the emitted light may be provided on one surface of the red light quantum dot unit  118   b  and the green light quantum dot unit  118   c  in the forward direction. The filtering part  118   d  may be formed in a film shape. In an exemplary embodiment, the filtering part  118   d  may filter the blue-based light which is not changed by the red light quantum dot unit  118   b  and the green light quantum dot unit  118   c . When the filtering part  118   d  filters the blue-based light, the filtering part  118   d  may be realized using a blue light cut-off filter. One surface of the filtering part  118   d , facing the rearward direction, may be in contact with or adjacent to at least one of the red light quantum dot unit  118   b  and the green light quantum dot unit  118   c . Another surface of the filtering part  118   d , facing the forward direction, may be installed to be in contact with or adjacent to the second substrate  112 . 
     The quantum dot sheet  118  may be installed on one surface of the second substrate  112  in the rearward direction, and the second polarizing filter  111  may be installed on one surface in the forward direction. In an exemplary embodiment, a filtering part  118   d  may be installed on the surface of the second substrate  112 . 
     In particular, red light quantum dot units, green light quantum dot units, and light transmitters may be installed on the second substrate  112  in predetermined patterns, respectively. In this case, the second substrate  112  may be divided into a plurality of unit areas, and in each unit area, the red light quantum dot units, the green light quantum dot units, and the light transmitters may be installed in the same pattern. Each of the unit areas may include a plurality of sub areas. One of the red light quantum dot unit, the green light quantum dot unit, and the light transmitter may be respectively installed in each sub area. 
     The second substrate  112  may be formed of a transparent material to transmit red light, green light, and blue light emitted from the quantum dot sheet  118 , and for example, may be manufactured using a synthetic resin such as an acrylic resin, and/or the like or glass and/or the like. 
     The second polarizing filter  111  may be installed on one surface of the second substrate  112  in the forward direction, and may polarize incident light. The light passed through and emitted from the second substrate  112 , for example, red-based light, green-based light, and blue-based light, may be incident onto the second polarizing filter  111 , and may be transmitted by the second polarizing filter  111  or be blocked by the second polarizing filter based on a vibration direction. 
     A polarizing axis of the second polarizing filter  111  may be perpendicular to a polarizing axis of the first polarizing filter  117 , and thus, when the first polarizing filter  117  is a vertical polarizing filter, the second polarizing filter  111  may be a horizontal polarizing filter. 
     When the polarizing axis of the second polarizing filter  111  is perpendicular to the polarizing axis of the first polarizing filter  117 , and the liquid crystal molecules  114   a  of the liquid crystal layer  114  are aligned in a straight line to transmit the light passed through the first polarizing filter  117 , the vibration direction of the light passed through the first polarizing filter  117  is not changed, and may not pass through the second polarizing filter  111 , and thus, the light passed through the second substrate  112  may not be emitted to the outside. In contrast, when the liquid crystal molecules  114   a  of the liquid crystal layer  114  are aligned in a spiral shape and transmit the light passed through the first polarizing filter  117 , the vibration direction of the light passed through the first polarizing filter  117  may be changed and may pass through the second polarizing filter  111 . Thus, the light passes through the second substrate  112 , for example, and at least one of the red-based light, the green-based light and the blue-based light may be emitted to the outside. 
     By controlling emission of the red-based light, the green-based light, and the blue-based light to the outside, colors may be formed by combining the emitted lights, and the display apparatus  100  may display a predetermined image using at least one of the above red-based light, the green-based light, and the blue-based light. 
     Hereinbefore, the display apparatus  100  according to the exemplary embodiment is described, but various components may be added to the above described components. For example, a fourth substrate on which various components configured to control various operations of the display apparatus  100  may be further provided. Here, the various components, for example, may include a processor or a storage device realized by one or two or more semiconductor chips, various circuits, or various components configured to support the operation of the processor. The fourth substrate may be installed on various positions, for example, the fourth substrate may be fixedly installed inside the rear housing  102 . Additionally, various other components may be provided on the display apparatus  100 . 
       FIG. 26  is an exploded perspective view illustrating a second exemplary embodiment of a display apparatus, and  FIG. 27  is a side cross-sectional view illustrating the second exemplary embodiment of the display apparatus. 
     According to the second exemplary embodiment of the display apparatus  200  as shown in  FIGS. 26 and 27 , the display apparatus  200  may include housings  201  and  202  configured to form an exterior, a display panel  210  configured to generate an image, and a BLU  220  configured to supply light to the display panel  210 . 
     Specifically, the housings  201  and  202  may include a front housing  201  installed in the forward direction, a rear housing  202  installed in the rearward direction, and the display panel  210  may include a second polarizing filter  211 , a second substrate  212 , a quantum dot sheet  218 , a second electrode  213 , a first electrode  215 , a first substrate  216 , and a first polarizing filter  217 , and the BLU  220  may include an optical plate  221 , a diffusion plate  225 , a fourth substrate  230 , a light source  231 , a light guide plate  232 , and a reflecting plate  233 . According to one or more exemplary embodiments, one or more of these components may be omitted. 
     The front housing  201  may be disposed in the most forward direction of the display apparatus  200 , and the rear housing  202  may be disposed in the most rearward direction of the display apparatus  200 , and both of them are combined to form an exterior of the display apparatus  200 . The front housing  201  may include a fixing part  201   b  for forming a bezel and a side part  201   a  extended from an end portion of the fixing part  201   b  in a direction toward the rear housing  202 . An opening  201   c  may be defined by a front of the front housing  201 . 
     The fourth substrate  230  may be installed inside the rear housing  202 . The fourth substrate  230  applies an electric signal to the light source  231 , and the light source  231  may radiate light of a predetermined wavelength. Various components configured to control the light source  231  may be provided on the fourth substrate  230 . Also, a processor and/or the like configured to various operations of the display apparatus in addition to the light source may be installed on the fourth substrate  230 . The processor may be realized by one or two or more semiconductor chips and related components. 
     A spacer configured to protect one surface of the fourth substrate  230  may be provided on the fourth substrate  230 . The reflecting plate  233  and the light guide plate  232  may be sequentially installed in a forward direction of the spacer. 
     The light source  231  may be installed on the fourth substrate  230 , and emit light of a predetermined color in a sideward direction of the light guide plate  232 . Here, the light of a predetermined color may include blue-based light. The light source  231  may be installed on the side surface of the light guide plate  232  to be separated from the light guide plate  232 . The light source  231  may be installed along the side surface of the light guide plate  232  on at least one end of the fourth substrate  230  in a straight line, or may be installed in two columns along both side surfaces of the light guide plate  232 . 
     In some exemplary embodiments, the light source  231  may be directly installed on the fourth substrate  230 , or installed on a holder additionally provided on the fourth substrate  230 . 
     As illustrated in  FIG. 27 , light RL 1  and RL 2  radiated from the light sources  231  may be incident onto the light guide plate  232  through the side surfaces of the light guide plate  232 , respectively. The light incident onto the light guide plate  232  may be totally reflected and transmitted in the light guide plate  232 , and thus, the light may be uniformly incident onto one surface of the display panel  210 . 
     The light source  231  may include a light bulb, a halogen lamp, a fluorescent lamp, a sodium lamp, a mercury lamp, a fluorescent mercury lamp, a xenon lamp, an arc illumination lamp, a neon tube lamp, an EL lamp, an LED lamp, and/or the like, and additionally, various illumination devices may be included in the light source  231 . 
     As illustrated in  FIG. 24 , the light source  231  may include the light converter  145   a , and when the light source  231  uses a blue light emitting diode, the light converter  145   a  may include a green light converting unit. The green light converting unit, for example, may include a green quantum dot particle, or a green fluorescent particle. In this case, the blue-based light may be mixed with the green-based light in the light source  231  and emitted, and thus, color reproducibility generated by the color of the light emitted from the blue light emitting diode may be improved. In some exemplary embodiments, the light source  231  may not include the light converter  145   a . The light source  231  is described in detail with reference to  FIG. 24 , and thus, the detailed description thereof will be omitted. 
     A spacer may be installed on one surface of the fourth substrate  230  and protrude in the forward direction, and may prevent various components such as a semiconductor chip installed on the fourth substrate  230  from directly contacting the reflecting plate  233 . Thus, damage of the components installed on the fourth substrate  230 , the reflecting plate  170 , and/or the like may be prevented. 
     The reflecting plate  233  may be installed on one surface of the spacer in a forward direction, and reflect a part RL 1  and RL 2  of the light proceeding in the light guide plate  232  in the rearward direction toward the forward direction or a direction similar thereto. Thus, the light radiated from the light source  231  may proceed in a direction toward the display panel  210 . The reflecting plate  233 , as described above, may be manufactured using a synthetic resin such as PET, PC, and/or the like. Additionally, the reflecting plate  233  may be manufactured using various materials. 
     The light guide plate  232  may reflect the light RL 1  and RL 2  internally emitted from the light source  231  one or more times, and the light emitted from the light source  231  may be uniformly supplied to the display panel  210 . The light radiated from the light source  231  is incident onto the side surface of the light guide plate  232 . The display panel  210 , the diffusion plate  225 , or the optical plate  221  may be disposed to be in contact with the one surface of the light guide plate  232  in the forward direction, and the reflecting plate  233  may be attached to one surface in the rearward direction. The light guide plate  232  may be manufactured using a material having high light transmission, and for example, may be manufactured using PMMA, and/or the like. 
     At least one of the diffusion plate  225  and the optical plate  221  may be disposed between the display panel  210  and the light guide plate  232 . 
     The diffusion plate  225  may serve to diffuse incident light. The diffusion plate  225  may diffuse the incident light and may serve to uniformly disperse the light radiated from the light source  231  in various directions. 
     The optical plate  221 , for example, may include at least one diffusion sheet  222 , at least one prism sheet  223 , and at least one protection sheet  224 . These are similar to the diffusion sheet  122 , the prism sheet  123 , and the protection sheet  124  described above, and thus, the detailed description thereof will be omitted. 
     The diffusion plate  225  and the optical plate  221  may be omitted according to an exemplary embodiment, and may be substituted by a film or a substrate of a different type. 
     The light passed through the diffusion plate  225  and the optical plate  221  may be incident onto the rear surface of the display panel  210 . 
     A middle housing  203  configured to fix the display panel  210  or the BLU  220 , or separate the display panel  210  and the BLU  220  may be further provided between the display panel  210  and the BLU  220 . The middle housing  203  may be omitted according to an exemplary embodiment. 
     The display panel  210  may convert the incident light of a predetermined color into light of a different color or emit without conversion into the different color. The display panel  210 , as illustrated in  FIGS. 26 and 27 , may include the first polarizing filter  217 , the first substrate  216 , the first electrode  215 , the second electrode  213 , a liquid crystal layer  214 , the quantum dot sheet  218 , the second substrate  212 , and the second polarizing filter  211 . 
     The first polarizing filter  217  polarizes the light incident from the light source  231  on the first substrate  216 , and only a part of light vibrating in a direction the same as a predetermined polarizing axis may be incident onto the first substrate  216 . 
     The first electrode  215  may be installed on the first substrate  216 . The first substrate  216  may transmit the light passed through the first polarizing filter  217  to the liquid crystal layer  214 . 
     The liquid crystal layer  214  may transmit the light passed through the first polarizing filter  217  in a direction toward the quantum dot sheet  218  based on the arrangement of the liquid crystal molecules. 
     The first electrode  215  and the second electrode  213  may generate an electrical field in the liquid crystal layer  214 , and the liquid crystal molecules in the liquid crystal layer  214  may be arranged in a straight line or a spiral shape based on the generated electrical field. 
     The quantum dot sheet  218  may be provided to convert the incident light of a predetermined color, for example, blue-based light, into light of a different color, or may be provided to output the light without conversion to the different color. The quantum dot sheet  218  may include a light transmitter configured to transmit the blue-based light, at least one red light quantum dot unit configured to convert the incident blue-based light and emit red-based light, and at least one green light quantum dot unit configured to convert the incident blue-based light and emit green-based light. 
     The light transmitter may emit a part of the incident light in a direction toward the second substrate  212  without a change of color, and then emit another part in a direction toward the second substrate  212  after conversion of the color. In particular, the light transmitter  118   a  may include a main body including light transmitting material and a light converting unit disposed in the main body, and in an exemplary embodiment, the light transmitter  118   a  may further include dispersion particles disposed in the main body. 
     The light converting unit may change a color of the light incident onto the main body and emit in a direction toward the second substrate  212 . For example, when the incident light is blue-based light, the light converting unit may convert the blue-based light into green-based light or red-based light and emit. In an exemplary embodiment, the light converting unit may include a green light converting unit configured to convert the blue-based light into the green-based light, and here, the green light converting unit may be realized using at least one of the green quantum dot particle and the green fluorescent particle. The light converting unit may be omitted when the light converter is provided in the light source  231 . 
     Because the light transmitter may emit the blue-based light mixed with a part of green-based light based on the light converting unit, the display apparatus  200  may have increased expression related to the blue color, and thus, color reproducibility of the display apparatus  200  may be improved. 
     The dispersion particle may disperse the incident blue-based light, and emit in a direction toward the second substrate  212 . The dispersion particle may include zinc oxide, titanium oxide, silicon oxide, and/or the like. 
     The red light quantum dot unit and the green light quantum dot unit may convert the color of the blue-based light, which is emitted in a direction toward the display panel  210  through the light guide plate  232 , using quantum dots, into red-based light or green-based light, and emit in the direction toward the second substrate  212 . 
     A filtering part such as a blue light cut-off filter may be installed on the red light quantum dot unit and the green light quantum dot unit. The filtering part may be installed on one surface of the red light quantum dot unit and the green light quantum dot unit in the forward direction, and may filter the blue-based light of the light emitted from the red light quantum dot unit and the green light quantum unit. 
     The second substrate  212  may transmit the light emitted from the quantum dot sheet  218 . The quantum dot sheet  218  may be installed on the second substrate  212 , and a filtering part may be further installed based on necessity. 
     The second polarizing filter  211  may block or transmit a part of the red-based light, the green-based light, and the blue-based light emitted from the display panel  210 . A polarizing axis of the second polarizing filter  211  may be different from a polarizing axis of the first polarizing filter  217  provided between the light guide plate  232  and the display panel  210 , and in particular, both polarizing axes  240  and  269  may be perpendicular to each other. 
     Hereinbefore, the second exemplary embodiment of the display apparatus  200  is described, but various components may be added according to one or more exemplary embodiments. For example, a touch screen panel may be added to perform a touch operation related to the display apparatus  200 , or an additional film may be installed and attached to the display panel  210 . 
       FIG. 28  is an exploded perspective view illustrating a third exemplary embodiment of the display apparatus, and  FIG. 29  is a side cross-sectional view illustrating the third exemplary embodiment of the display apparatus. 
     As illustrated in  FIGS. 28 and 29 , the display apparatus  300  includes, the front housing  301 , the first substrate  340 , electrodes  351  and  352 , an OLED assembly  360 , the second substrate  370 , and the rear housing  390 . According to one or more exemplary embodiments, one or more of these components may be omitted. 
     The front housing  301  is disposed in the most forward direction of the display apparatus  100 , and the rear housing  390  is disposed in the most rearward direction of the display apparatus  100 , and both of them are combined and form the exterior of the display apparatus  100 . 
     The front housing  301  and the rear housing  390  include various components of the display apparatus  300  in the display apparatus  300 , and may stably fix various components in the display apparatus  100  and protect them from an external impact. 
     The front housing  301  may include a fixing part  303  forming a bezel, and the side part  302  formed to extend in a direction of the rear housing  390  from an end of the fixing parts  303 . The side part  302  may be combined with the rear housing  390 . An opening  304  may be defined by a front surface of the front housing  301 . 
     The first substrate  340  is exposed to the outside in the forward direction, and an electrode  350  and the OLED assembly  360  are installed in the rearward direction thereof. Various optical sheets such as a protection film, a polarizing film, and/or the like may be installed on one surface of the first substrate  340  in the forward direction. 
     The first substrate  340  may be formed of a transparent material so that red-based light, green-based light, and blue-based light emitted from the OLED assembly  360  may pass therethrough. For example, the first substrate  340  may be manufactured using a synthetic resin such as a polymethyl methacrylate resin, glass and/or the like. 
     The electrode  350  includes a first electrode  351  and a second electrode  352 , and the OLED assembly  360  is provided between the first electrode  351  and the second electrode  352 . The first electrode  351  and the second electrode  352  are electrically connected to an external electric power source, and have a negative polarity or a positive polarity based on the external electric power. When the first electrode  351  and the second electrode  352  have the negative polarity or the positive polarity, a current flows through a light emitter  364  including a fluorescent organic compound of the OLED assembly  360 , and electrons are combined with holes in the light emitter  364 , and thus, light is emitted. 
     The first electrode  351  may include a common electrode. The second electrode  352  may be provided to correspond to each light emitter  364 . Thus, a plurality of second electrodes  352  may be provided based on the number of the light emitters  364 . 
     At least one of the first electrode  351  and the second electrode  352  may be formed with a metal thin film formed in aluminum, silver, magnesium, calcium, a combination thereof, and/or the like, and in addition to the above, may be formed of indium tin oxide (ITO). 
     The OLED assembly  360  may include a light output part  362  configured to output light of a predetermined color and a substrate  361  on which the light output part  362  is installed, and the light output part  362  may include a color determination part  363  and a light emitter  364 . 
     The light emitter  364  may receive electrons and holes based on the voltage applied to the first electrode  351  and the second electrode  352 , and may emit light based on the recombination of the received electrons and holes. In an exemplary embodiment, the light emitter  364  may include a blue phosphorescent unit configured to generate blue-based light. 
     Each of the light emitters  364 , as illustrated in  FIG. 29 , may be installed to correspond to a red light quantum dot unit  363   r , a green light quantum dot unit  363   g , and a light transmitter  363   t  of the color determination part  363 . In other words, light generated from each of the light emitters  364  may be incident onto the red light quantum dot unit  363   r , the green light quantum dot unit  363   g , and the light transmitter  363   t.    
     The color determination part  363  may convert the light of the predetermined color emitted from the light emitter  364  into light of a different color or output without conversion into the light of different color. The color determination part  363  may be provided to convert the blue-based light into red-based light or green-based light, or to emit a part of blue-based light without conversion. 
     In particular, the color determination part  363  may include at least one red light quantum dot unit  363   r  configured to change the blue-based light and emit the red-based light, at least one green light quantum dot unit  363   g  configured to change the blue-based light and emit the green-based light, and a light transmitter  363   t  configured to transmit the blue-based light. 
     The light transmitter  363   t  may emit a part of blue-based light to the outside without conversion, and change the remaining blue-based light into green-based light and emit the blue-based light with the green-based light. Also, the light transmitter  363   t  may disperse and emit all or a part of the blue-based light. 
     The light transmitter  363   t  may include a main body including a light transmitting material and at least one light converting unit  363   a  dispersed in the main body to convert the light of a predetermined color into light of a different color. In an exemplary embodiment, the light transmitter  363   t  may further include dispersion particles  363   b  dispersed in the main body. 
     The light converting unit  363   a  may change a color of the light incident onto the main body and emit in a direction toward the second substrate  370 . For example, when the light emitted from the light emitter  364  is blue-based light, the light converting unit  363   a  may convert the blue-based light into green-based light or red-based light and emit. In an exemplary embodiment, the light converting unit  363   a  may include a green light converting unit configured to convert the blue-based light into the green-based light, and the green light converting unit may include at least one of the green quantum dot particle and the green fluorescent particle. Because a part of green-based light is mixed with the blue-based light emitted from the light transmitter  363   t  by the light converting unit  363   a , the display apparatus  300  may display the blue portion more precisely, and thus, color reproducibility of the display apparatus  300  may be improved. 
     The dispersion particle  363   b  may disperse incident light and emit in the direction toward the second substrate  370 . For example, when the light emitted from the light emitter  364  is blue-based light, the dispersion particle  363   b  may disperse the blue-based light and emit in the direction toward the second substrate  370 . The dispersion particle may include zinc oxide, titanium oxide, silicon oxide, and/or the like. 
     The red light quantum dot unit  363   r , the green light quantum dot unit  363   g , and the light transmitter  363   t  are already described above, and thus, the detailed description thereof will be omitted. 
     In an exemplary embodiment, an emitting surface through which the red-based light or the green-based light of at least one of the red light quantum dot unit  363   r  and the green light quantum dot unit  363   g  is emitted may be designed to be wider than an emitting surface through which the blue-based light of the light transmitter  363   t  is emitted. In an exemplary embodiment, the OLED assembly  360  may include at least one of the red light quantum dot units  363   r  and the green light quantum dot units  363   g  in a relatively greater number than the light transmitters  363   t.    
     The second electrode  352  may be installed on the second substrate  370 , and various components configured to control various operations of the display apparatus  100  may also be installed thereon. The various components installed on the second substrate  370  may include a processor and/or the like, and the processor may be realized by one or two or more semiconductor chips and related components. The processor provided on the second substrate  370  adjusts the application of electric power to the first electrode  351  and the second electrode  352 , and the light output part  362  may emit the light. 
     Hereinbefore, the third exemplary embodiment of the display apparatus  300  including the OLED is described, but additional various components may be added. For example, a touch screen panel, a protection film, a reflecting plate, a polarizing plate, and/or the like may be further added in the display apparatus  300 . 
     Exemplary embodiments have been shown and described above, however it would be appreciated by those skilled in the art that changes may be made to these exemplary embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined in the claims and their equivalents.