Display apparatus having quantum dot unit or quantum dot sheet and method for manufacturing quantum dot unit

There is provided a display apparatus and a method of manufacturing the same. The display apparatus includes: a quantum dot unit or a quantum dot sheet capable of improving heat dissipation performance. A wire with high heat transfer rate is provided in the quantum dot unit or the quantum dot sheet, and the wire is connected to the bottom chassis of the display apparatus so as to dissipate heat generated in the quantum dot.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority from Korean Patent Application No. 10-2016-0164135, filed on Dec. 5, 2016 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety.

BACKGROUND

Apparatuses and methods consistent with one or more exemplary embodiments relate to a display apparatus including a quantum dot unit or a quantum dot sheet, and more particularly, to a quantum dot unit having a structure capable of improving heat dissipation performance, a quantum dot sheet including the same, and a display apparatus including the quantum dot unit or the quantum dot sheet.

2. Description of the Related Art

A display apparatus is an output device for presentation of data information, such as characters and figures, and an image in visual form.

A display apparatus may include a self-emissive display panel such as an organic light-emitting diode (OLED) or a light-receiving display panel such as a liquid crystal display (LCD).

A display apparatus provided with a light-receiving display panel may include a backlight unit to supply light to the display panel.

A related art display apparatus may have an improved color reproducibility by providing a quantum dot unit at one side of a backlight unit. A quantum dot refers to a semiconductor crystal having a nanometer size and manufactured by a chemical synthesis process. Smaller quantum dots emit light having shorter wavelengths and larger quantum dots emit light having longer wavelengths.

When a quantum dot unit is applied to a display apparatus, excellent color reproducibility may be realized with low manufacturing costs. However, due to the difficulty in directly controlling a temperature of the quantum dot unit caused by heat generation, an indirect heat dissipation method is used. Thus, efficiency of the quantum dot unit decreases at high temperature and design and performance of the backlight unit are limited. In addition, since a component for heat dissipation is added to the display apparatus including the quantum dot unit, it is difficult to provide a customer with a display apparatus having reasonable manufacturing costs.

SUMMARY

Aspects of one or more exemplary embodiments provide a quantum dot unit having a structure capable of improved heat dissipation performance with reasonable manufacturing costs, a quantum dot sheet including the same, and a display apparatus including the quantum dot unit or the quantum dot sheet.

According to an aspect of an exemplary embodiment, there is provided a display apparatus including: a display panel; a light source configured to emit light; a light guide plate configured to guide the light emitted from the light source toward the display panel; and a quantum dot unit disposed on a light path between the light source and the display panel and including a plurality of quantum dots and at least one wire between the plurality of quantum dots.

The display apparatus may further include a chassis configured to support the quantum dot unit, wherein both ends of the at least one wire may be connected to the chassis.

The chassis may include a heat dissipation member and the both ends of the at least one wire may be connected to the heat dissipation member.

The quantum dot unit may further include a glass fiber having a hollow; the plurality of quantum dots may be accommodated in the hollow; and the at least one wire may have a length greater than a length of the glass fiber and may extend into the hollow to protrude from both ends of the glass fiber.

The quantum dot unit may further include a protection layer at the both ends of the glass fiber to prevent the plurality of quantum dots from being exposed.

The display apparatus may further include a plurality of quantum dot units, including the quantum dot unit, stacked in a thickness direction of the light guide plate.

The plurality of quantum dot units may be attached to each other by an adhesive member.

The display apparatus may further include a printed circuit board mounted with the light source and under the light guide plate in the thickness direction of the light guide plate; a middle mold configured to support the display panel, the middle mold including an intermediate support part on the light guide plate in the thickness direction of the light guide plate to face the printed circuit board with the light source therebetween; and a fixing member including: a first fixing member at the intermediate support part to fix a first quantum dot unit facing the intermediate support part among the plurality of quantum dot units, and a second fixing member installed at the printed circuit board to fix a second quantum dot unit facing the printed circuit board among the plurality of quantum dot units.

The display apparatus may further include a printed circuit board mounted with the light source and under the light guide plate in the thickness direction of the light guide plate; and a middle mold configured to support the display panel, the middle mold including an intermediate support part on the light guide plate in the thickness direction of the light guide plate to face the printed circuit board with the light source disposed therebetween, wherein at least one of the plurality of quantum dot units is fixed to at least one of the printed circuit board and the intermediate support part.

The display apparatus may further include a plurality of quantum dot units, including the quantum dot unit, wherein the plurality of quantum dot units may include: a first quantum dot unit including a first quantum dot configured to generate a first color; and a plurality of second quantum dot units each including a second quantum dot configured to generate a second color different from the first color and arranged along an outer circumference of the first quantum dot unit, and wherein the first quantum dot unit does not include the second quantum dot and the plurality of second quantum dot units do not include the first quantum dot.

The at least one wire may include a plurality of wires between the plurality of quantum dots.

The light guide plate may have a light-incident surface on which light emitted from the light source is incident; and the quantum dot unit may be between the light-incident surface and the light source.

The plurality of quantum dot units may be disposed to be spaced apart respectively from the light guide plate and the light source.

According to an aspect of another exemplary embodiment, there is provided a display apparatus including: a display panel; a light source configured to emit light to the display panel; an optical sheet above the light source; and a quantum dot sheet adjacent to the optical sheet and including a plurality of quantum dots and at least one wire between the plurality of quantum dots.

The display apparatus may further include a chassis configured to support the quantum dot sheet, wherein both ends of the at least one wire protruding from both ends of the quantum dot sheet may be connected to the chassis.

The chassis may include a heat dissipation member and the both ends of the at least one wire may be connected to the heat dissipation member.

The display apparatus may further include a diffuser plate between the display panel and the light source and configured to diffuse the light emitted from the light source and guide the light toward the display panel, wherein the quantum dot sheet may be between the optical sheet and the diffuser plate.

The quantum dot sheet may further include at least one quantum dot unit including a glass fiber having a hollow, the plurality of quantum dots may be accommodated in the hollow of the glass fiber, and the at least one wire may be aligned to penetrate the hollow of the glass fiber.

The at least one quantum dot unit may further include a protection layer at both ends of the glass fiber configured to prevent the plurality of quantum dots from being exposed.

According to an aspect of another exemplary embodiment, there is provided a method of manufacturing a quantum dot unit, the method including: providing a wire having a length greater than a length of a glass fiber in a hollow of the glass fiber; injecting a quantum dot resin including a quantum dot into the hollow of the glass fiber; curing the quantum dot resin; and forming a protection layer on the glass fiber to prevent the quantum dot from being exposed.

According to an aspect of an exemplary embodiment, there is provided a quantum dot unit for a display apparatus, the quantum dot unit including: a plurality of quantum dots accommodated in a hollow; and at least one wire extending between the plurality of quantum dots and configured to dissipate heat generated in the plurality of quantum dots.

The at least one wire may have a length greater than a length of the hollow and may protrude from both ends of the hollow.

The quantum dot unit may further include a glass fiber including the hollow.

The quantum dot unit may further include a protection layer at the both ends of the glass fiber to prevent the plurality of quantum dots from being exposed.

The at least one wire may include a plurality of wires between the plurality of quantum dots.

DETAILED DESCRIPTION

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. The present disclosure may, however, be embodied in many different forms and should not be construed as being limited to exemplary embodiments set forth herein.

The terms used in the present specification are merely used to describe particular exemplary embodiments, and are not intended to limit the present disclosure. An expression used in the singular encompasses the expression of the plural, unless the context clearly indicates otherwise. Throughout the specification, it is to be understood that the terms such as “include” or “have” etc., are intended to indicate the existence of the features, numbers, operations, components, parts, or combinations thereof disclosed in the specification, and are not intended to preclude the possibility that one or more other features, numbers, operations, components, parts, or combinations thereof may exist or may be added.

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. The above terms are used only to distinguish one component from another. For example, a first component discussed below could be termed a second component, and similarly, the second component may be termed the first component without departing from the teachings of this disclosure. As used herein, the term “and/or” and the term “at least one of” includes any and all combinations of one or more of the associated listed items.

Meanwhile, the terms used throughout the specification “front end,” “rear end,” “on,” “under,” “upper end,” “lower end,” and the like are defined based on the drawings and the shape and position of each element are not limited by these terms.

FIG. 1is a view illustrating a display apparatus1according to an exemplary embodiment.FIG. 2is an exploded perspective view illustrating the display apparatus1.FIG. 3is a partial cross-sectional view illustrating the display apparatus1.

A display apparatus1is an apparatus to display information, data, and the like in the form of characters, figures, graphs, and/or images and includes a television which is a telecommunication medium for transmitting moving images and image signals and a monitor that is an output device of a computer.

The display apparatus1may be a flat display apparatus having a flat screen as illustrated inFIG. 1, a curved display apparatus having a curved screen, or a bendable display apparatus having a screen that is reversibly changeable between a flat shape and a curved shape or has a variable curvature.

The display apparatus1may include a display panel4configured to display an image as a display unit of the display apparatus1and a backlight unit (e.g., backlight) configured to emit light toward the display panel4.

The display panel4may include a liquid crystal panel. The liquid crystal panel may display an image by using liquid crystals exhibiting different optical properties according to voltage and temperature. The liquid crystal panel may include a thin film transistor (TFT) substrate, a color filter substrate coupled to face the TFT substrate, and liquid crystals injected between the TFT substrate and the color filter substrate. The TFT substrate may be a transparent substrate in which TFTs, as switching devices, are provided in a matrix form. The color filter substrate may be a transparent substrate in which RGB color pixels, which are color pixels expressing predetermined colors, are formed by a thin film process.

The display panel4may be connected to a signal transmission film7to receive data driving signals and gate driving signals. The signal transmission film7may be provided in a chip on flexible printed circuit (COF) type in which a driving chip is mounted on a flexible circuit board.

The backlight unit may be disposed at a lower portion of the display panel4to emit light toward the display panel4. However, it is understood that one or more other exemplary embodiments are not limited thereto, and the backlight unit may be provided at other locations relative to the display panel4.

The backlight unit may be an edge-type in which a light source11is disposed on at least one side of a plurality of long sides and short sides of the display panel4according to the present exemplary embodiment. According to another exemplary embodiment, the backlight unit may be a direct-type in which the light source11is disposed directly behind the display panel4.

The backlight unit may include a light source module10, which includes the light source11and a printed circuit board12on which the light source11is mounted, and various optical members on a path of light emitted from the light source11.

The light source11may include a light emitting diode (LED). The LED may be provided in the form of a package in which an LED chip is mounted on a substrate and filled with a resin. However, it is understood that one or more other exemplary embodiments are not limited thereto. For example, according to another exemplary embodiment, the light source11may include a cold cathode fluorescent lamp (CCFL) or an external electrode fluorescent lamp (EEFL).

A plurality of light sources11may be linearly mounted on the printed circuit board12along an edge of the display panel4. The printed circuit board12may be provided with a circuit pattern or the like to transmit driving power and signals to the light source11. The printed circuit board12may be seated or provided on a bottom chassis90which will be described below.

The optical members may be disposed on the path of light emitted from the light source11to guide a proceeding or emitting direction of light and/or to improve optical characteristics.

The optical members may include a reflector sheet40to prevent a loss of light by reflecting light, a light guide plate50to uniformly distribute light emitted from the light source11toward the display panel4, and various optical sheets61and62to improve optical characteristics.

The reflector sheet40may reflect light emitted from the light source11to be incident on a bottom surface of the light guide plate50. The reflector sheet40may be provided in various forms such as a sheet, a film, and a plate. For example, the reflector sheet40may be formed by coating a base material with a material having a high reflectance. Examples of the base material may be SUS (e.g., stainless steel), BRASS, aluminum, polyethylene terephthalate (PET), and the like, and examples of a highly reflective coating agent may be silver and titanium dioxide TiO2.

The reflector sheet40may be seated on the printed circuit board12and supported thereby.

The light guide plate50may be formed of polymethyl methacrylate (PMMA). The light guide plate50may be provided with a pattern to change an optical path. In the edge-type backlight unit according to the present exemplary embodiment, the light source11may be disposed on one side of the light guide plate50. Light incident on the side of the light guide plate50is scattered by a pattern formed on the bottom surface of the light guide plate50and emitted via a top surface of the light guide plate50.

The light guide plate50may be seated or provided on the reflector sheet40. The light guide plate50may be disposed such that one side of the light guide plate50is spaced apart from the light source11at a predetermined interval in consideration of thermal expansion.

The optical sheets61and62may be disposed on the light guide plate50to improve optical characteristics of light emitted from the light guide plate50.

The optical sheets61and62may include, for example, a diffuser sheet61and a prism sheet62.

The diffuser sheet61may offset or minimize the pattern of the light guide plate50. Since light guided by the light guide plate50directly reaches eyes of a user, the user may see the pattern of the light guide plate50. Thus, the diffuser sheet61may offset or minimize the pattern.

The prism sheet62may increase brightness of light which rapidly decreases while passing through the diffuser sheet61by concentrating the light. A dual brightness enhancement film (DBEF) that is a high brightness prism sheet, or the like may be used as the prism sheet62.

According to another exemplary embodiment. the optical sheets may further or alternatively include a protection sheet to protect the optical sheets from external impact or foreign matters.

The optical sheets61and62may be disposed between the light guide plate50and the display panel4.

The optical members may further include a quantum dot unit100,110,120,130,140, or150.

The quantum dot unit100,110,120,130,140, or150may improve color reproducibility by changing wavelengths of light. Color reproducibility refers to a degree at which color of an object may be reproduced with fidelity and indicates an expressed area on color coordinates. The quantum dot unit100,110,120,130,140, or150may be disposed on an optical path between the light source11and the display panel4.

The quantum dot unit100,110,120,130,140, or150may include a quantum dot102. The quantum dot102may receive blue light and generate all colors of visible light according to the size thereof. Smaller quantum dots emit light having shorter wavelengths and larger quantum dots emit light having longer wavelengths.

The quantum dot units100,110,120,130,140, and150will be described in more detail below.

The display apparatus1may further include a chassis assembly to accommodate and support the display panel4and the backlight unit.

The chassis assembly may include a top chassis70, a middle mold80, and a bottom chassis90.

The top chassis70may have an opening71to expose the display panel4, a bezel part72to support edges of the front surface of the display panel4, and a top chassis side part73extending downward from the bezel part72.

The middle mold80may include a middle mold side part81and an intermediate support part82protruding inward from the middle mold side part81to support the display panel4and the optical member and maintain intervals.

The bottom chassis90may include a bottom part91disposed under the backlight unit and a bottom side part92extending upward from the bottom part91. The printed circuit board12of the light source module10may be seated or provided on the bottom part91.

Various elements of the display apparatus1such as the top chassis70and the middle mold80may be fixedly supported by the bottom chassis90.

The bottom chassis90may dissipate heat generated in the light source11to the outside. That is, heat generated in the light source11may be transferred to the bottom chassis90via the printed circuit board12and dissipated through the bottom chassis90. To this end, the bottom chassis90may include a heat dissipation member93formed of various metallic materials having high thermal conductivity such as aluminum and SUS or plastic materials such as ABS. In addition, a metallic printed circuit board (PCB) formed of aluminum with high thermal conductivity may also be used as the printed circuit board12.

However, it is understood that one or more other exemplary embodiments are not limited thereto. For example, according to another exemplary embodiment, the bottom chassis90may also be formed of various metallic materials having high thermal conductivity such as aluminum and SUS or plastic materials such as ABS without including the separate heat dissipation member93. In addition, according to another exemplary embodiment, at least one of the top chassis70, the middle mold80, and the bottom chassis90may be omitted or integrated with each other.

The display apparatus1may further include a housing enclosing the chassis assembly to protect and accommodate the chassis assembly.

The display apparatus1may further include legs2to support the display apparatus1on an installation surface. The display apparatus1may be supported on a floor or other flat surface as illustrated inFIG. 1. In addition, the display apparatus1may be provided as a wall-mounted type or a built-in type installed in a wall.

FIG. 4is a view illustrating a quantum dot unit100according to a first exemplary embodiment applicable to a display apparatus according to an exemplary embodiment.

The quantum dot unit100(e.g., quantum dot device or object) may have softness. The quantum dot unit100may include a glass fiber101. The glass fiber101may have a hollow101a. Particularly, the glass fiber101may have a tube shape with the hollow101a. Although the glass fiber101may have a circular cross-section as illustrated inFIG. 4, the shape of the cross-section of the glass fiber101is not limited thereto in one or more other exemplary embodiments.

The quantum dot unit100may further include a plurality of quantum dots102accommodated in the hollow101a. The quantum dots102may include various quantum dots generating various colors. For example, the quantum dots102may include a first quantum dot102agenerating red color and a second quantum dot102bgenerating green color. As illustrated inFIG. 4, both the first quantum dot102aand the second quantum dot102bmay be contained in the hollow101aof the glass fiber101.

The quantum dot unit100may further include a protection layer103configured to cover both ends of the glass fiber101. The protection layer103may include at least one of an acrylic resin, a silicone resin, and an epoxy resin.

The quantum dots102are vulnerable to moisture or oxygen. For example, when the quantum dots102react with moisture or oxygen, optical characteristics of the quantum dots102may change. The glass fiber101may prevent the optical characteristics of the quantum dots102from changing by blocking moisture or oxygen. In addition, the protection layer103prevents the quantum dots102from being exposed at both ends of the glass fiber101to inhibit reactions with moisture or oxygen.

The protection layer103may also be provided to cover an outer circumferential surface of the glass fiber101in addition to the both ends of the glass fiber101. The protection layer disposed on the outer circumferential surface of the glass fiber101prevents reactions between the quantum dots102and moisture or oxygen together with the glass fiber101. In addition, the protection layer disposed on the outer circumferential surface of the glass fiber101serves to prevent occurrence of cracks in the glass fiber101when the quantum dot unit100is deformed.

The quantum dot unit100may further include a wire104inserted into the hollow101aof the glass fiber101. The wire104may be longer than the glass fiber101and protrude from both ends of the glass fiber101. The wire104may include a metal having high thermal conductivity such as copper, gold, and silver. A thinner wire104may have higher light transmittance. Furthermore, the quantum dot unit100may include a plurality of wires104penetrating the hollow101aof the glass fiber101.

FIG. 5is a graph illustrating the relationship between surface temperature of a quantum dot102and efficiency of the quantum dot102in a quantum dot unit100or a quantum dot sheet applicable to a display apparatus according to an exemplary embodiment.FIG. 6is a graph illustrating the relationship between density of a quantum dot102and surface temperature of the quantum dot102in a quantum dot unit100or a quantum dot sheet applicable to the display apparatus according to an exemplary embodiment.

The quantum dot102receives light from the light source11, changes the wavelength of the light, and emits the light with the changed wavelength while simultaneously generating heat. As illustrated inFIG. 5, the surface temperature of the quantum dot102is inversely proportional to the efficiency of the quantum dot unit100. That is, as the surface temperature of the quantum dot102decreases, light conversion efficiency of the quantum dot unit100increases. Conversely, as the surface temperature of the quantum dot102increases, light conversion efficiency of the quantum dot unit100decreases.

As can be seen in the graph ofFIG. 6, the density of the quantum dot102is directly proportional to the surface temperature of the quantum dot102. That is, as the number of the quantum dots102contained in the same hollow101aof the glass fiber101increases, the surface temperature of the quantum dots102increases. Conversely, as the number of the quantum dots102contained in the same hollow101aof the quantum dot unit100decreases, the surface temperature of the quantum dots102decreases.

If the density of the quantum dots102contained in the hollow101aof the glass fiber101is too low, a desired amount of light whose wavelength is changed may not be obtained. Thus, a predetermined density or more of the quantum dot102may be considered. Therefore, in order to increase the efficiency of the quantum dot unit100having the predetermined density or more of the quantum dots102, heat dissipation performance of the quantum dot unit100may serve as an important factor.

The wire104inserted into the hollow101aof the glass fiber101of the quantum dot unit100may be arranged to dissipate heat generated in the quantum dots102out of the quantum dot unit100. Thus, a diameter of the wire104may be increased in proportion to a diameter of the hollow101aof the glass fiber101. However, a plurality of wires104each having a small diameter may be inserted thereinto to improve light transmittance.

Both ends of the wire104may be connected to the bottom chassis90of the display apparatus1that support the quantum dot unit100. For example, both ends of the wire104may be connected to the heat dissipation member93provided in the bottom chassis90. The ends of the wire104may be provided with a connection member105for easy connection to the bottom chassis90or the heat dissipation member93. The connection member105may include a metal having high thermal conductivity or the like.

As illustrated inFIG. 6, an effect of reducing the surface temperature of the quantum dot102may be obtained in the quantum dot unit100having the same density of quantum dots since the quantum dot unit100inlcudes the wire104with a heat dissipating capability and/or structure. That is, even when the density of quantum dots increases in the hollow101aof the quantum dot unit100, a surface temperature increase ratio of the quantum dots may be reduced by the heat dissipation effect of the wire104. Thus, the density of quantum dots may be determined with less influence by or consideration of the temperature, so that the quantum dot unit100may be easily designed,

FIG. 7is a flowchart for describing a method of manufacturing a quantum dot unit100according to an exemplary embodiment.

According to the present exemplary embodiment, a glass fiber101having a hollow101aand a quantum dot resin including quantum dots102is prepared or obtained.

The glass fiber101is cut to a length corresponding to or based on a length of the light source module10or one side of the light guide plate50of the display apparatus1to which the quantum dot unit100is installed.

A wire104having a length greater than that of the cut glass fiber101is prepared or obtained and inserted into the hollow101aof the glass fiber101(510). The wire104is prepared to have a sufficient length to allow the manufactured quantum dot unit100to be connected to the bottom chassis90or the heat dissipation member93and is arranged to protrude from the both ends of the glass fiber101.

The resin including the quantum dots102is injected into the hollow101aof the glass fiber101into which the wire104is inserted (520) and the injected quantum dot resin is cured (530).

A protection layer103is formed or provided to cover both ends of the glass fiber101or the entire glass fiber101to prevent the quantum dots102contained in the quantum dot resin from being exposed to air (540).

For easy connection between the prepared wire104of the quantum dot unit100and the bottom chassis90or the heat dissipation member93of the display apparatus1, both ends of the wire104may be connected to the connection member105to be connected to the bottom chassis90or the heat dissipation member93of the display apparatus1.

FIG. 8is a view illustrating a quantum dot unit110according to a second exemplary embodiment applicable to a display apparatus according to an exemplary embodiment.

As illustrated inFIG. 8, the quantum dot unit110may include a plurality of stacked quantum dot units100. In other words, the quantum dot unit110according to the second exemplary embodiment may include a plurality of quantum dot units100according to an exemplary embodiment (e.g., the first exemplary embodiment described above).

The quantum dot unit110according to the second exemplary embodiment may further include an adhesive member300or adhesive. The adhesive member300may attach the plurality of quantum dot units100according to an exemplary embodiment to each other. The adhesive member300may include at least one of an acrylic resin, a silicone resin, an epoxy resin, etc.

As illustrated inFIG. 8, the adhesive member300may be disposed between adjacent quantum dot units100according to an exemplary embodiment. Particularly, the adhesive member300may be disposed on contact surfaces of adjacent quantum dot units100according to an exemplary embodiment. For example, when a first quantum dot unit and a second quantum dot unit are stacked, the adhesive member300may be disposed between contact surfaces of the first quantum dot unit and the second quantum dot unit.

FIG. 9is a view illustrating a quantum dot unit120according to a third exemplary embodiment applicable to a display apparatus according to an exemplary embodiment.

As illustrated inFIG. 9, the quantum dot unit120according to the third exemplary embodiment may include a plurality of stacked quantum dot units100according to an exemplary embodiment (e.g., the first exemplary embodiment described above).

The quantum dot unit120according to the third exemplary embodiment may further include an adhesive member300. The adhesive member300may attach the plurality of quantum dot units100according to an exemplary embodiment to each other. The adhesive member300may include at least one of an acrylic resin, a silicone resin, an epoxy resin, etc.

As illustrated inFIG. 9, the adhesive member300may cover the plurality of stacked quantum dot units100according to an exemplary embodiment. In other words, the adhesive member300may cover or surround all outer circumferential surfaces of the plurality of stacked quantum dot units100according to the first exemplary embodiment.

FIG. 10is a view illustrating a quantum dot unit130according to a fourth exemplary embodiment applicable to a display apparatus according to an exemplary embodiment.

As illustrated inFIG. 10, the quantum dot unit130according to the fourth exemplary embodiment may include a plurality of stacked quantum dot units100according to an exemplary embodiment (e.g., the first exemplary embodiment).

The quantum dot unit130according to the fourth exemplary embodiment may further include an adhesive member300. The adhesive member300may attach the plurality of quantum dot units100according to an exemplary embodiment to each other. The adhesive member300may include at least one of an acrylic resin, a silicone resin, an epoxy resin, etc.

As illustrated inFIG. 10, the adhesive member300may cover a part of each of the plurality of stacked quantum dot units100according to an exemplary embodiment. In other words, the adhesive member300may cover a part of the outer circumferential surface of each of the plurality of stacked quantum dot units100according to an exemplary embodiment.

FIG. 11is a view illustrating a quantum dot unit140according to a fifth exemplary embodiment applicable to a display apparatus according to an exemplary embodiment.

As illustrated inFIG. 11, the quantum dot unit140according to the fifth exemplary embodiment may include a first quantum dot unit140a. The first quantum dot unit140amay have softness. The first quantum dot unit140amay include a glass fiber101having a hollow101aand a first quantum dot102aaccommodated in the hollow101a. In addition, the first quantum dot unit140amay further include a protection layer provided to cover both ends of the glass fiber101.

The first quantum dot unit140amay further include a first wire104ainserted into the hollow101aof the glass fiber101. The first wire104amay have a length greater than that of the glass fiber101and protrude from the both ends of the glass fiber101. The first wire104amay include a metal having high thermal conductivity such as copper, gold, and silver. A thinner first wire104amay have higher light transmittance. Furthermore, the first quantum dot unit140amay include a plurality of first wires104apenetrating the hollow101aof the glass fiber101.

Both ends of the first wire104amay be connected to the bottom chassis90of the display apparatus1that supports the quantum dot unit140a. For example, both ends of the first wire104amay be connected to the heat dissipation member93of the bottom chassis90.

The quantum dot unit140according to the fifth exemplary embodiment may further include a plurality of second quantum dot units140b. The plurality of second quantum dot units140bmay be arranged along the outer circumferential surface of the first quantum dot unit140a. Each of the plurality of second quantum dot units140bmay have softness. Each of the plurality of second quantum dot units140bmay include a glass fiber101having a hollow101aand a second quantum dot102baccommodated in the hollow101a. The second quantum dot102bmay generate a color different from that generated by the first quantum dot102a. In addition, each of the plurality of second quantum dot units140bmay further include a protection layer provided to cover both ends of the glass fiber101.

The second quantum dot unit140bmay further include a second wire104binserted into the hollow101aof the glass fiber101. The second wire104bmay have a length greater than that of the glass fiber101and may be arranged to protrude from both ends of the glass fiber101. The second wire104bmay include a metal having high thermal conductivity such as copper, gold, and silver. A thinner second wire104bmay have higher light transmittance. Furthermore, the second quantum dot unit140bmay include a plurality of second wires104bpenetrating the hollow101aof the glass fiber101.

Both ends of the second wire104bmay be connected to the bottom chassis90of the display apparatus1that supports the quantum dot unit140a. For example, both ends of the second wire104bmay be connected to the heat dissipation member93provided in the bottom chassis90.

A diameter of the first quantum dot unit140amay be greater than a diameter of each of the plurality of second quantum dot units140b. In addition, a diameter of the first wire104amay be greater than a diameter of the second wire104b.

The second quantum dot units140bmay all have the same diameter and the second wires104bmay also all have the same diameter.

However, it is understood that one or more other exemplary embodiments are not limited thereto. For example, according to another exemplary embodiment, at least one of the plurality of second quantum dot units140bmay have a different diameter from another and at least one of the second wires104bof the second quantum dot units140amay also have a different diameter from another.

According to an exemplary embodiment, the first quantum dot102amay generate red light and the second quantum dot102bmay generate green light. Furthermore, the number of the second quantum dots102bmay be that of the first quantum dots102a.

The quantum dot unit140according to the fifth exemplary embodiment may further include an adhesive member300. The adhesive member300may attach the first quantum dot unit140aand the plurality of second quantum dot units140bto each other. In addition, the adhesive member300may attach the plurality of second quantum dot units140bto each other. The adhesive member300may include at least one of an acrylic resin, a silicone resin, an epoxy resin, etc.

FIG. 12is a view illustrating a quantum dot unit150according to a sixth exemplary embodiment applicable to a display apparatus according to an exemplary embodiment. Hereinafter, redundant descriptions already given above with reference toFIG. 4will not be repeated.

As illustrated inFIG. 12, the glass fiber101of the quantum dot unit150according to the sixth exemplary embodiment may have a rectangular cross-section. However, it is understood that the shape of the cross-section of the glass fiber101is not limited thereto.

FIG. 13is a view illustrating a quantum dot sheet200according to a first exemplary embodiment applicable to a display apparatus1according to an exemplary embodiment.

As illustrated inFIG. 13, the display apparatus1may further include a quantum dot sheet200. In other words, the display apparatus1may further include the quantum dot sheet200in the form of a sheet including a plurality of quantum dot units100according to an exemplary embodiment (e.g., the first exemplary embodiment and/or the fifth exemplary embodiment).

The quantum dot sheet200may be implemented by dispersing the plurality of quantum dot units100according to an exemplary embodiment (e.g., the first exemplary embodiment) in a resin210. The quantum dot sheet200may be implemented by an extrusion process.

FIG. 14is a view illustrating a quantum dot sheet200aaccording to a second exemplary embodiment applicable to a display apparatus1according to an exemplary embodiment.

As illustrated inFIG. 14, the display apparatus1may further include a quantum dot sheet200a. In other words, the display apparatus1may further include a quantum dot sheet200ain the form of a sheet including a plurality of quantum dot units100according to an exemplary embodiment (e.g., the first exemplary embodiment and/or the fifth exemplary embodiment).

The quantum dot sheet200aaccording to the second exemplary embodiment may have a quantum dot containing layer220including a plurality of quantum dot units, e.g., at least one of a plurality of quantum dot units100according to the first exemplary embodiment and a plurality of quantum dot units140according to the fifth exemplary embodiment.

The quantum dot containing layer220may be implemented in the same or similar manner as in the quantum dot sheet200according to the first exemplary embodiment as described above with reference toFIG. 13.

The quantum dot sheet200aaccording to the second exemplary embodiment may further include a protection layer230stacked on at least one surface of the quantum dot containing layer220. The protection layer230may be coated on at least one surface of the quantum dot containing layer220. For example, the protection layer230may be coated on top and bottom surfaces of the quantum dot containing layer220. The protection layer230may include polyethylene terephthalate (PET).

FIG. 15is a view illustrating a quantum dot sheet200baccording to a third exemplary embodiment applicable to a display apparatus1according to an exemplary embodiment.

As illustrated inFIG. 15, the display apparatus1may further include a quantum dot sheet200b. Particularly, the display apparatus1may include the quantum dot sheet200bin the form of a sheet including the quantum dots102. The quantum dot sheet200bmay include a quantum dot containing layer240implemented by dispersing the quantum dots102in a resin and extruding the resultant.

The quantum dot sheet200baccording to the third exemplary embodiment may further include a protection layer250that covers at least one portion of the quantum dot containing layer240. For example, the protection layer250may be coated to cover the entire quantum dot containing layer240. The protection layer250may include polyethylene terephthalate (PET).

In addition, the quantum dot sheet200baccording to the third exemplary embodiment may include at least one wire104penetrating the quantum dot containing layer240. The wire104may have a length greater than that of a side of the quantum dot containing layer240and may be arranged to protrude from both ends of the quantum dot sheet200b. The wire104may include a metal having high thermal conductivity, such as copper, gold, and silver. A thinner wire104may have higher light transmittance. When the plurality of wires104are inserted into the quantum dot sheet200b, the plurality of wires104may be arranged in parallel with one another or in a mesh form.

Both ends of the wire104may be connected to the bottom chassis90of the display apparatus1that supports the quantum dot sheet200b. For example, the both ends of the wire104may be connected to the heat dissipation member93of the bottom chassis90.

FIG. 3is a view illustrating a structure in which a quantum dot unit100according to an exemplary embodiment (e.g., the first exemplary embodiment ofFIG. 4) is disposed in a display apparatus1according to an exemplary embodiment.

As illustrated inFIG. 3, the quantum dot unit100according to the first exemplary embodiment may be disposed between the light source11and the light guide plate50to convert wavelengths of light emitted from the light source11.

The light guide plate50may have a light-incident surface51on which light emitted from the light source11is incident. The light guide plate50may further have a light-emitting surface52through which light incident on the light guide plate50is emitted toward the display panel4. In addition, the light guide plate50may further include a bottom surface53facing the light-emitting surface52of the light guide plate50.

The quantum dot unit100according to the first exemplary embodiment may be disposed between the light source11and the light-incident surface51of the light guide plate50to convert wavelengths of light emitted from the light source11.

The quantum dot unit100according to the first exemplary embodiment may be arranged to be spaced apart respectively from the light guide plate50and the light source11.

The light source11may emit blue light. The blue light emitted from the light source11is converted into white light while passing through the quantum dot unit100. White light having passed through the quantum dot unit100is incident on the light-incident surface51of the light guide plate50and emitted through the light-emitting surface52of the light guide plate50toward the display panel4.

FIG. 16is a view illustrating a structure in which a quantum dot unit140according to an exemplary embodiment (e.g., the fifth exemplary embodiment ofFIG. 11) is disposed in a display apparatus1according to an exemplary embodiment.

As illustrated inFIG. 16, the quantum dot unit140according to the fifth exemplary embodiment may be disposed between the light source11and the light guide plate50to convert wavelengths of light emitted from the light source11.

The light guide plate50may have a light-incident surface51on which light emitted from the light source11is incident. The light guide plate50may further have a light-emitting surface52through which light incident on the light guide plate50is emitted toward the display panel4.

The quantum dot unit140according to the fifth exemplary embodiment may be disposed between the light source11and the light-incident surface51of the light guide plate50to convert wavelengths of light emitted from the light source11.

The quantum dot unit140according to the fifth exemplary embodiment may be disposed to be spaced apart respectively from the light guide plate50and the light source11.

The light source11may emit blue light. The blue light emitted from the light source11is converted into white light while passing through the quantum dot unit140. White light having passed through the quantum dot unit140is incident on the light-incident surface51of the light guide plate50and emitted through the light-emitting surface52of the light guide plate50toward the display panel4.

Since the quantum dot unit140according to the fifth exemplary embodiment includes a plurality of wires104, both ends of each of the plurality of wires104may be connected to the connection member105and the connection member105may be connected to the bottom chassis90or the heat dissipation member93for easy connection between the plurality of wires104and the bottom chassis90or the heat dissipation member93.

FIG. 17is a view illustrating a structure in which a quantum dot unit110(e.g., according to the second exemplary embodiment ofFIG. 8) is disposed in a display apparatus1according to an exemplary embodiment.

As illustrated inFIG. 17, the quantum dot unit110according to the second exemplary embodiment may be disposed between the light source11and the light guide plate50to convert wavelengths of light emitted from the light source11. In this case, the quantum dot unit110according to the second exemplary embodiment may have a structure in which a plurality of quantum dot units100according to an exemplary embodiment (e.g., the first exemplary embodiment) are stacked in a thickness direction D of the light guide plate50.

The light guide plate50may have a light-incident surface51on which light emitted from the light source11is incident. The light guide plate50may further have a light-emitting surface52through which light incident on the light guide plate50is emitted toward the display panel4.

The quantum dot unit110according to the second exemplary embodiment may be disposed between the light source11and the light-incident surface51of the light guide plate50to convert wavelengths of light emitted from the light source11.

The quantum dot unit110according to the second exemplary embodiment may be disposed to be spaced apart respectively from the light guide plate50and the light source11.

The light source11may emit blue light. The blue light emitted from the light source11is converted into white light while passing through the quantum dot unit110. White light having passed through the quantum dot unit110is incident on the light-incident surface51of the light guide plate50and emitted through the light-emitting surface52of the light guide plate50toward the display panel4.

The display apparatus1may include the printed circuit board12mounted with the light source11and disposed under the light guide plate50in the thickness direction D of the light guide plate50.

The display apparatus1may further include the middle mold80configured to support the display panel4. The middle mold80may include the intermediate support part82disposed on the light guide plate50in the thickness direction D of the light guide plate50to face the printed circuit board12with the light source11therebetween.

The display apparatus1may further include a fixing member400. The fixing member400may include a first fixing member410installed or provided at the intermediate support part82to fix a first quantum dot unit111facing the intermediate support part82among the plurality of quantum dot units100. The fixing member400may further include a second fixing member420installed or provided at the printed circuit board12to fix a second quantum dot unit112facing the printed circuit board12among the plurality of quantum dot units100.

Since the quantum dot unit110according to the second exemplary embodiment includes a plurality of wires104, both ends of each of the plurality of wires104may be connected to the connection member105and the connection member105may be connected to the bottom chassis90or the heat dissipation member93for easy connection between the plurality of wires104and the bottom chassis90or the heat dissipation member93.

FIG. 18is a view illustrating another structure in which a quantum dot unit110according to an exemplary embodiment (e.g., the second exemplary embodiment ofFIG. 8) is disposed in a display apparatus1according to another exemplary embodiment. Hereinafter, redundant descriptions already given above with reference toFIG. 17will not be repeated.

As illustrated inFIG. 18, at least one of the plurality of quantum dot units100may be fixed to at least one of the printed circuit board12and the intermediate support part82. For example, the first quantum dot unit111facing the intermediate support part82among the plurality of quantum dot units100may be fixed to the intermediate support part82and the second quantum dot unit112facing the printed circuit board12among the plurality of quantum dot units100may be fixed to the printed circuit board12.

When the quantum dot unit110according to the second exemplary embodiment is disposed as illustrated inFIG. 18, the separate fixing member400described above inFIG. 17may be omitted.

FIG. 19is a view illustrating a structure in which a quantum dot sheet200according to an exemplary embodiment (e.g., the first exemplary embodiment ofFIG. 13) is disposed on a light guide plate50in a display apparatus1according to an exemplary embodiment.

As illustrated inFIG. 19, the quantum dot sheet200according to the first exemplary embodiment may be disposed on the light guide plate50.

The display apparatus1may include the optical sheets61and62disposed on the light guide plate50in the thickness direction D of the light guide plate50to improve optical characteristics of light emitted from the light guide plate50. The quantum dot sheet200may be disposed between the light guide plate50and the optical sheets61and62.

The light source11may emit blue light. The blue light emitted from the light source11is incident on the light-incident surface51of the light guide plate50and emitted through the light-emitting surface52of the light guide plate50to the quantum dot sheet200. Blue light is converted into white light while passing through the quantum dot sheet200. White light having passed through the quantum dot sheet200is emitted toward the display panel4via the optical sheets61and62.

It is understood that the present exemplary embodiment is not limited to the quantum dot sheet200of the first exemplary embodiment illustrated inFIG. 13. For example, according to other exemplary embodiments, the quantum dot sheet200aaccording to the second exemplary embodiment ofFIG. 14or the quantum dot sheet200baccording to the third exemplary embodiment ofFIG. 15may also be located at the position of the quantum dot sheet200according to the first exemplary embodiment illustrated inFIG. 19.

Since the quantum dot sheets200,200a, and200baccording to the first to third exemplary embodiments include the plurality of wires104, both ends of each of the wires104may be connected to the connection member105and the connection member105may be connected to the bottom chassis90or the heat dissipation member93for easy connection between the plurality of wires104and the bottom chassis90or the heat dissipation member93.

FIG. 20is a view illustrating a structure in which a quantum dot sheet200(e.g., according to the first exemplary embodiment ofFIG. 13) is disposed under a light guide plate50in a display apparatus1according to an exemplary embodiment.

As illustrated inFIG. 20, the quantum dot sheet200according to the first exemplary embodiment may be disposed under the light guide plate50.

The display apparatus1may include the printed circuit board12mounted with the light source11and disposed under the light guide plate50in the thickness direction D of the light guide plate50. The quantum dot sheet200may be disposed between the light guide plate50and the printed circuit board12. Here, the quantum dot sheet200according to the first exemplary embodiment may also serve as the reflector sheet40. In other words, the quantum dot sheet200according to the first exemplary embodiment may not only convert blue light into white light but also serve as the reflector sheet40.

The light source11may emit blue light. Blue light emitted from the light source11is incident on the light-incident surface51of the light guide plate50. A portion of light incident on the light guide plate50may be diffusely reflected by the bottom surface53of the light guide plate50. The diffusely reflected light by the bottom surface53of the light guide plate50is converted into white light by the quantum dot sheet200and then totally reflected by the quantum dot sheet200, also serving as the reflector sheet40, toward the bottom surface53of the light guide plate50. The totally reflected light arriving at the bottom surface53of the light guide plate50is emitted through the light-emitting surface52of the light guide plate50toward the display panel4.

It is understood that the present exemplary embodiment is not limited to the quantum dot sheet200of the first exemplary embodiment illustrated inFIG. 13. For example, according to other exemplary embodiments, the quantum dot sheet200aaccording to the second exemplary embodiment ofFIG. 14or the quantum dot sheet200baccording to the third exemplary embodiment ofFIG. 15may also be located at the position of the quantum dot sheet200according to the first exemplary embodiment illustrated inFIG. 20.

Since the quantum dot sheets200,200a, and200baccording to the first to third exemplary embodiments include a plurality of wires104, both ends of each of the wires104may be connected to the connection member105and the connection member105may be connected to the bottom chassis90or the heat dissipation member93for easy connection between the plurality of wires104and the bottom chassis90or the heat dissipation member93.

FIG. 21is a view illustrating a structure in which a quantum dot sheet200(e.g., according to the first exemplary embodiment ofFIG. 13) is disposed on a side of a light guide plate50in a display apparatus1according to an exemplary embodiment.

As illustrated inFIG. 21, the quantum dot sheet200according to the first exemplary embodiment may be disposed on one side of the light guide plate50. That is, the quantum dot sheet200according to the first exemplary embodiment may be disposed between the light-incident surface51of the light guide plate50and the light source11. In this case, the quantum dot sheet200may be attached to the light-incident surface51of the light guide plate50.

The light source11may emit blue light. Blue light emitted from the light source11is converted into white light while passing through the quantum dot sheet200. White light having passed through the quantum dot sheet200is incident on the light-incident surface51of the light guide plate50and emitted through the light-emitting surface52of the light guide plate50toward the display panel4.

It is understood that the present exemplary embodiment is not limited to the quantum dot sheet200of the first exemplary embodiment illustrated inFIG. 13. For example, according to other exemplary embodiments, the quantum dot sheet200aaccording to the second exemplary embodiment ofFIG. 14or the quantum dot sheet200baccording to the third exemplary embodiment ofFIG. 15may also be located at the position of the quantum dot sheet200according to the first exemplary embodiment illustrated inFIG. 21.

Since the quantum dot sheets200,200a, and200baccording to the first to third exemplary embodiments include a plurality of wires104, both ends of each of the wires104may be connected to the connection member105and the connection member105may be connected to the bottom chassis90or the heat dissipation member93for easy connection between the plurality of wires104and the bottom chassis90or the heat dissipation member93.

FIG. 22is a cross-sectional view illustrating a display apparatus1according to another exemplary embodiment. Hereinafter, redundant descriptions already given above with reference toFIGS. 1 to 4will not be repeated.

As illustrated inFIG. 22, a light guide plate50amay include a plurality of quantum dot units100(e.g., according to the first exemplary embodiment ofFIG. 4). In other words, a plurality of quantum dot units100according to an exemplary embodiment may be added to the light guide plate50aduring a process of forming the light guide plate50a. It is understood that the present exemplary embodiment is not limited to the quantum dot unit100of the first exemplary embodiment illustrated inFIG. 4. For example, according to other exemplary embodiments, the light guide plate50amay also include a plurality of quantum dot units140according to the fifth exemplary embodiment and/or the plurality of quantum dot units100according to the first exemplary embodiment. That is, the light guide plate50amay include at least one of the plurality of quantum dot units100according to the first exemplary embodiment and the plurality of quantum dot units140according to the fifth exemplary embodiment.

The light source11may emit blue light. Blue light emitted from the light source11is incident on the light-incident surface51of the light guide plate50a. Light incident on the light guide plate50ais converted into white light by at least one of the plurality of quantum dot units100according to the first exemplary embodiment and the plurality of quantum dot units140according to the fifth exemplary embodiment included in the light guide plate50aand emitted through the light-emitting surface52of the light guide plate50atoward the display panel4.

Since the light guide plate50aincludes a plurality of wires104, both ends of each of the wires104may be connected to the connection member105and the connection member105may be connected to the bottom chassis90or the heat dissipation member93for easy connection between the plurality of wires104and the bottom chassis90or the heat dissipation member93.

FIG. 23is a cross-sectional view illustrating a display apparatus1according to another exemplary embodiment. Hereinafter, redundant descriptions already given above with reference toFIGS. 1 to 4andFIG. 10will not be repeated.

As illustrated inFIG. 23, the display apparatus1may include a plurality of light guide plates50. The plurality of light guide plates50may be mounted on the printed circuit board12to be spaced apart from each other. For example, the plurality of light guide plates50may include a first light guide plate54mounted at the right side of the printed circuit board12and a second light guide plate55mounted at the left side of the printed circuit board12.

The display apparatus1may further include a light source11disposed between the plurality of light guide plates50. The light source11may be disposed between the plurality of light guide plates50to emit light toward the respective light guide plates50. The light source11may be mounted on the printed circuit board12to be disposed between the plurality of light guide plates50.

The display apparatus1may further include a plurality of quantum dot units130(e.g., according to the fourth exemplary embodiment ofFIG. 10). For example, the plurality of quantum dot units130according to the fourth exemplary embodiment may include a first quantum dot unit131disposed between the first light guide plate54and the light source11and a second quantum dot unit132disposed between the second light guide plate55and the light source11.

A portion of the first quantum dot unit131facing the first light guide plate54may be covered with the adhesive member300. In other words, the first quantum dot unit131may be disposed between the first light guide plate131and the light source11such that the adhesive member300faces the first light guide plate54.

A portion of the second quantum dot unit132facing the second light guide plate55may be covered with the adhesive member300. In other words, the second quantum dot unit132may be disposed between the second light guide plate55and the light source11such that the adhesive member300faces the second light guide plate55.

The light source11may emit blue light. A portion of blue light emitted from the light source11may be converted into white light while passing through the first quantum dot unit131. White light having passed through the first quantum dot unit131is incident on a light-incident surface51of the first light guide plate54and emitted through a light-emitting surface52of the first light guide plate54toward the display panel4. Another portion of blue light emitted from the light source11is converted into white light while passing through the second quantum dot unit132. White light having passed through the second quantum dot unit132is incident on a light-incident surface51of the second light guide plate55and emitted through a light-emitting surface52of the second light guide plate55toward the display panel4.

The first quantum dot unit131and the second quantum dot unit132may be disposed on the printed circuit board12. Since the first quantum dot unit131and the second quantum dot unit132include a plurality of wires104, both ends of each of the plurality of wires104may be connected to the connection member105, and the connection member105may be connected to the printed circuit board12for easy connection between the plurality of wires104and the printed circuit board12.

FIG. 24is an exploded perspective view illustrating a display apparatus1aaccording to another exemplary embodiment.

As illustrated inFIG. 24, a display apparatus1amay include a display module1000to display an image. The display module1000will be described in more detail below.

The display apparatus1amay further include a case2000defining an appearance thereof.

The case2000may include a front case2100and a rear case2200coupled to each other to accommodate the display module1000therein.

The case2000may be provided with various terminals providing connection with various external devices. In addition, buttons, switches, or the like to receive an operation command from a user may be provided therein. For example,FIG. 24illustrates an operation command input button2500provided at the front case2100.

The display apparatus1amay further include a control board3000to supply power and transmit signals to the display module1000. The control board3000may be disposed in the case2000. In particular, the control board3000may be disposed between the display module1000and the rear case2200.

FIG. 25is an exploded perspective view illustrating a display module1000of the display apparatus1aillustrated inFIG. 24.FIG. 26is a cross-sectional view of the display module1000of the display apparatus1aillustrated inFIG. 24.

As illustrated inFIGS. 25 and 26, the display module1000may include a top chassis1100disposed on the front surface of the display apparatus1a, a bottom chassis1200disposed on the rear surface of the display apparatus1a, and a mold frame1300disposed in the display apparatus1a.

The top chassis1100is disposed on the same surface of a display panel5000that displays an image to prevent edge portions of the display panel5000from being exposed to the outside. The top chassis1100may include a bezel part1100ato cover front edges of the display panel5000and a top side part1100bbent backward from edges of the bezel part1100a.

The bottom chassis1200may be disposed on the opposite side of the display panel5000. In addition, the bottom chassis1200may prevent various components included in the display apparatus1afrom being exposed to the outside and protect the various components of the display apparatus1afrom external impact. A backlight unit4000may be installed or provided at the bottom chassis1200. The bottom chassis1200may include a bottom rear part1200aon which the backlight unit4000is seated and a bottom side part1200bextending forward from edges of the bottom rear part1200a. The bottom rear part1200amay be provided with a seating groove1200recessed such that a circuit board4300of the backlight unit400is seated thereon.

The mold frame1300may be provided to support the display panel5000and the diffuser plate7000. The mold frame1300may support the display panel5000disposed in front of the mold frame1300and the diffuser plate7000disposed behind the mold frame1300. The top chassis1100may be installed in front of the mold frame1300to maintain the display panel5000in a state of being installed at the mold frame1300. The bottom chassis1200may be installed behind the mold frame1300.

The display module1000may include the display panel5000. Descriptions of the display panel5000have already been given above with reference to the display panel4ofFIGS. 1 and 2and will not be repeated.

The display module1000may further include a backlight unit (BLU)4000to supply light to the display panel5000. The backlight unit4000may be disposed behind the display panel5000to be spaced apart therefrom.

The backlight unit4000may include a plurality of light sources4100that generate light. The plurality of light sources4100are devices that emit light, and may include, for example, light emitting diodes (LEDs). The plurality of light sources4100may be installed on the front surface of the circuit board4300to face the diffuser plate7000. In addition, the plurality of light sources4100may emit light toward the display panel5000.

Furthermore, the backlight unit4000may also include a plurality of lenses4200respectively surrounding the plurality of light sources4100. The plurality of lenses4200may be installed or provided in the plurality of light sources4100respectively to diffuse light generated by the plurality of light sources4100. The plurality of lenses4200may have a circular shape, but the shape of the plurality of lenses4200may vary or be modified in one or more other exemplary embodiments. The plurality of lenses4200may be implemented using a transparent resin. For example, the plurality of lenses4200may be implemented using polycarbonate (PC), polymethyl methacrylate (PMMA), acrylic, or the like. The materials used to form the plurality of lenses4200are not limited thereto and various other materials such as glass may also be used therefor.

In addition, the backlight unit4000may further include the circuit board4300mounted with the plurality of light sources4100. The circuit board4300may include at least one of a printed circuit board and a flexible copper clad laminate.

The circuit board4300may be disposed on the bottom chassis1200. The circuit board4300may extend in a direction to correspond to the display panel5000. The circuit board4300may have a conductive pattern. The plurality of light sources4100and the circuit board4300may be electrically connected to each other by wire bonding, flip chip bonding, or the like.

The backlight unit4000may include a plurality of circuit boards4300arranged in parallel to each other. The plurality of light sources4100and the plurality of lenses4200respectively installed or provided in the plurality of light sources4100may be arranged to be spaced apart from each other along a lengthwise direction of each of the circuit boards4300. The plurality of circuit boards4300may be connected to each other via a connection substrate4400.

In addition, the backlight unit4000may further include a quantum dot sheet200that receives light emitted from the plurality of light sources4100and outputs white light (in which various colors are mixed). Here, the quantum dot sheet200may include the quantum dot sheets200,200a, and200baccording to the first to third exemplary embodiments. Since the quantum dot sheets200,200a, and200baccording to the first to third exemplary embodiments are described above with reference toFIGS. 13 to 15, redundant descriptions thereof already given above will not be repeated. An arrangement structure of the quantum dot sheet200will be described below.

The display module1000may further include a diffuser plate7000configured to diffuse light emitted from the X-ray detector400toward the display panel5000. The diffuser plate7000may be disposed between the display panel5000and the plurality of light sources4100to guide light toward the display panel5000by diffusing light emitted from the plurality of light sources4100. The diffuser plate7000may be disposed behind the display panel5000.

The display module1000may further include an optical sheet6000disposed in front of the diffuser plate7000to improve optical characteristics of light emitted from the plurality of light sources4100. The optical sheet6000may be disposed above the plurality of light sources4100. The optical sheet6000may include a prism film6100to condense light diffused by the diffuser plate7000in a direction perpendicular to the display panel5000. The optical sheet6000may further include a protection film6200to protect the prism film6100. The protection film6200may be provided on the entire surface of the prism film6100. The protection film6200protects various components of the backlight unit4000from external impact or foreign matters. In particular, since the prism film6100easily gets scratches, the protection film6200may be provided on the entire surface of the prism film6100to prevent formation of scratches on the prism film6100. The optical sheet6000may further include a double brightness enhance film. The double brightness enhance film may be disposed on the entire surface of the protection film6200. The double brightness enhance film is a type of polarizing film and is also referred to as a reflective polarizing film. The double brightness enhance film transmits polarized light parallel to a polarization direction of the double brightness enhance film and reflects polarized light non-parallel to the polarization direction of the double brightness enhance film among light emitted from the backlight unit4000. In this case, reflected light may be recycled inside the backlight unit4000to increase brightness of the display apparatus1a.

Hereinafter, an arrangement structure of the quantum dot sheet200according to an exemplary embodiment will be described.

The quantum dot sheet200may be disposed to be adjacent to the optical sheet6000to convert wavelengths of light emitted from the plurality of light sources4100. In particular, the quantum dot sheet200may be disposed between the optical sheet6000and the diffuser plate7000to change wavelengths of light emitted from the plurality of light sources4100. More particularly, the quantum dot sheet200may be disposed between the prism film6100and the diffuser plate7000.

Since the quantum dot sheet200includes a plurality of wires104, both ends of each of the plurality of wires104may be connected to the connection member105, and the connection member105may be connected to the bottom chassis1200or a heat dissipation member for easy connection between the plurality of wires104and the bottom chassis1200or the heat dissipation member.

As is apparent from the above description, heat of the quantum dot unit may be directly and efficiently dissipated with reasonable manufacturing costs by inserting a metal wire having high thermal conductivity into the hollow of the quantum dot unit including the quantum dots and accommodated in the hollow of the glass fiber.

A display apparatus having excellent heat dissipation performance and a slim design may be realized by inserting a metal wire having high thermal conductivity into the quantum dot sheet serving both as a reflector sheet and a light guide plate.