Patent Publication Number: US-2021175290-A1

Title: Organic light emitting diode display device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     The present application claims the priority benefit of Korean Patent Application No. 10-2019-0160623 filed on Dec. 5, 2019, which is hereby incorporated by reference in its entirety. 
     BACKGROUND 
     Field of the Disclosure 
     The present disclosure relates to an organic light emitting diode display device, and more particularly, to an organic light emitting diode display device including a wavelength converting layer. 
     Description of the Background 
     Recently, a flat panel display (FPD) having a thin profile, a light weight and a low power consumption has been developed and applied to various fields. 
     In an organic light emitting diode (OLED) display device among flat panel displays, charges are injected into a light emitting layer between a cathode of an electron injecting electrode and an anode of a hole injecting electrode to form an exciton, and the exciton transitions from an excited state to a ground state to emit a light. 
     A white OLED display device used as a display device of a high resolution and a small size for a virtual reality (VR) or an augmented reality (AR) or a display device of a big size for a television has been researched and developed. 
     The white OLED display device includes a light emitting layer emitting a white colored light and a color filter layer transmitting a light of a specific color (specific wavelength). For example, the white OLED display device includes a white subpixel, a red subpixel, a green subpixel and a blue subpixel emitting a white colored light, a red colored light, a green colored light and a blue colored light, respectively. 
     In the white OLED display device, the light emitting layer has a tandem structure including a plurality of stacks for emitting a white colored light of a relatively high color temperature and a relatively high luminance, and one of the plurality of stacks includes two or more dopants for emitting a light of two or more colors. 
     However, a difference in a charge distribution according to a current density and a difference in a white spectrum occur due to a combination of the two or more dopants in the one of the plurality of stacks. As a result, a difference in a white color temperature of gray levels clearly occurs in the white OLED display device. 
     To solve the above problems, a material for the light emitting layer emitting the white colored light may be changed or a composition ratio of materials for the light emitting layer emitting the white colored light may be adjusted. However, the change of the material or the adjustment range of the composition ratio is intensely limited and has a high level of difficulty. 
     SUMMARY 
     Accordingly, the present disclosure is directed to an organic light emitting diode display device that substantially obviates one or more of the problems due to limitations and disadvantages of the related art. 
     Also, the present disclosure is to provide an organic light emitting diode display device where a white spectrum of a relatively high color temperature and a relatively high luminance is stably obtained by converting a white colored light of a light emitting layer into a light of a different color using a wavelength converting layer. 
     In addition, the present disclosure is to provide an organic light emitting diode display device where various white spectrums are obtained and a color reproducibility is improved by converting a white colored light of a light emitting layer into a light of a different color using a wavelength converting layer and by transmitting a light of a predetermined color of the white colored light of the light emitting layer using a color filter layer. 
     Additional features and advantages of the disclosure will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the disclosure. These and other advantages of the disclosure will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. 
     To achieve these and other advantages and in accordance with the purpose of the present disclosure, as embodied and broadly described herein, an organic light emitting diode display device includes: a substrate having first, second, third and fourth subpixels; first, second and third color filter layers in the second, third and fourth subpixels, respectively, on the substrate; a first wavelength converting layer in the first subpixel on the substrate and second and third wavelength converting layers on the first and second color filter layers, respectively; and a light emitting diode in each of the first, second, third and fourth subpixels over the first, second and third wavelength converting. 
     It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the disclosure as claimed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate aspects of the disclosure and together with the description serve to explain the principles of the disclosure. 
       In the drawings: 
         FIG. 1  is a view showing an organic light emitting diode display device according to a first aspect of the present disclosure; 
         FIG. 2  is a view showing a subpixel of an organic light emitting diode display device according to the first aspect of the present disclosure; 
         FIG. 3  is a cross-sectional view showing an organic light emitting diode display device according to the first aspect of the present disclosure; 
         FIG. 4  is a plan view showing a first wavelength converting layer of an organic light emitting diode display device according to the first aspect of the present disclosure; 
         FIG. 5  is a plan view showing a first wavelength converting layer of an organic light emitting diode display device according to a second aspect of the present disclosure; 
         FIG. 6  is a plan view showing a first wavelength converting layer of an organic light emitting diode display device according to a third aspect of the present disclosure; 
         FIG. 7  is a cross-sectional view showing a light emitting diode of an organic light emitting diode display device according to the first aspect of the present disclosure; 
         FIG. 8  is a cross-sectional view showing a light emitting diode of an organic light emitting diode display device according to a fourth aspect of the present disclosure; 
         FIG. 9  is a view showing a spectrum of a fourth light of a first subpixel of an organic light emitting diode display device according to the first aspect of the present disclosure; 
         FIG. 10  is a view showing spectrums of fifth, sixth and seventh lights of second, third and fourth subpixels of an organic light emitting diode display device according to the first aspect of the present disclosure; 
         FIG. 11  is a cross-sectional view showing an organic light emitting diode display device according to a fifth aspect of the present disclosure; 
         FIG. 12  is a cross-sectional view showing an organic light emitting diode display device according to a sixth aspect of the present disclosure; 
         FIG. 13  is a cross-sectional view showing an organic light emitting diode display device according to a seventh aspect of the present disclosure; 
         FIG. 14  is a cross-sectional view showing an organic light emitting diode display device according to an eighth aspect of the present disclosure; and 
         FIG. 15  is a cross-sectional view showing an organic light emitting diode display device according to a ninth aspect of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Reference will now be made in detail to aspects of the present disclosure, examples of which may be illustrated in the accompanying drawings. In the following description, when a detailed description of well-known functions or configurations related to this document is determined to unnecessarily cloud a gist of the inventive concept, the detailed description thereof will be omitted. The progression of processing steps and/or operations described is an example; however, the sequence of steps and/or operations is not limited to that set forth herein and may be changed as is known in the art, with the exception of steps and/or operations necessarily occurring in a particular order. Like reference numerals designate like elements throughout. Names of the respective elements used in the following explanations are selected only for convenience of writing the specification and may be thus different from those used in actual products. 
     Advantages and features of the present disclosure, and implementation methods thereof will be clarified through following example aspects described with reference to the accompanying drawings. The present disclosure may, however, be embodied in different forms and should not be construed as limited to the example aspects set forth herein. Rather, these example aspects are provided so that this disclosure may be sufficiently thorough and complete to assist those skilled in the art to fully understand the scope of the present disclosure. Further, the present disclosure is only defined by scopes of claims. 
     A shape, a size, a ratio, an angle, and a number disclosed in the drawings for describing aspects of the present disclosure are merely an example. Thus, the present disclosure is not limited to the illustrated details. Like reference numerals refer to like elements throughout. In the following description, when the detailed description of the relevant known function or configuration is determined to unnecessarily obscure an important point of the present disclosure, the detailed description of such known function or configuration may be omitted. In a case where terms “comprise,” “have,” and “include” described in the present specification are used, another part may be added unless a more limiting term, such as “only,” is used. The terms of a singular form may include plural forms unless referred to the contrary. 
     In construing an element, the element is construed as including an error or tolerance range even where no explicit description of such an error or tolerance range. In describing a position relationship, when a position relation between two parts is described as, for example, “on,” “over,” “under,” or “next,” one or more other parts may be disposed between the two parts unless a more limiting term, such as “just” or “direct(ly),” is used. 
     In describing a time relationship, when the temporal order is described as, for example, “after,” “subsequent,” “next,” or “before,” a case which is not continuous may be included unless a more limiting term, such as “just,” “immediate(ly),” or “direct(ly),” is used. 
     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. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present disclosure. 
     In describing elements of the present disclosure, the terms like “first,” “second,” “A,” “B,” “(a),” and “(b)” may be used. These terms are merely for differentiating one element from another element, and the essence, sequence, order, or number of a corresponding element should not be limited by the terms. Also, when an element or layer is described as being “connected,” “coupled,” or “adhered” to another element or layer, the element or layer can not only be directly connected or adhered to that other element or layer, but also be indirectly connected or adhered to the other element or layer with one or more intervening elements or layers “disposed” between the elements or layers, unless otherwise specified. 
     The term “at least one” should be understood as including any and all combinations of one or more of the associated listed items. For example, the meaning of “at least one of a first item, a second item, and a third item” denotes the combination of all items proposed from two or more of the first item, the second item, and the third item as well as the first item, the second item, or the third item. 
     In the description of aspects, when a structure is described as being positioned “on or above” or “under or below” another structure, this description should be construed as including a case in which the structures contact each other as well as a case in which a third structure is disposed therebetween. The size and thickness of each element shown in the drawings are given merely for the convenience of description, and aspects of the present disclosure are not limited thereto. 
     Features of various aspects of the present disclosure may be partially or overall coupled to or combined with each other, and may be variously inter-operated with each other and driven technically as those skilled in the art can sufficiently understand. Aspects of the present disclosure may be carried out independently from each other, or may be carried out together in co-dependent relationship. 
     Reference will now be made in detail to the present disclosure, examples of which are illustrated in the accompanying drawings. 
       FIG. 1  is a view showing an organic light emitting diode display device according to a first aspect of the present disclosure, and  FIG. 2  is a view showing a subpixel of an organic light emitting diode display device according to a first aspect of the present disclosure. 
     In  FIG. 1 , an organic light emitting diode (OLED) display device  110  includes a timing controlling part  180 , a data driving part  182 , a gate driving part  184  and a display panel  186 . 
     The timing controlling part  180  generates a gate control signal, a data control signal and an image data using an image signal and a plurality of timing signals transmitted from an external system such as a graphic card or a television system. The timing controlling part  180  supplies the data control signal and the image data to the data driving part  182  and supplies the gate control signal to the gate driving part  184 . 
     The data driving part  182  generates a data signal (a data voltage) using the data control signal and the image data transmitted from the timing controlling part  180  and supplies the data voltage to a data line DL of the display panel  186 . 
     The gate driving part  184  generates a gate signal (a gate voltage) using the gate control signal transmitted from the timing controlling part  180  and supplies the gate voltage to a gate line GL of the display panel  186 . 
     The display panel  186  displays an image using the gate signal and the data signal. The display panel  186  includes the gate line GL, the data line DL and a plurality of subpixels SP (shown in  FIG. 2 ) connected to the gate line GL and the data line DL. 
     For example, each of the plurality of subpixels SP may be defined by the gate line GL and the data line DL crossing each other, and the plurality of subpixels SP may include first, second, third and fourth subpixels SP 1 , SP 2 , SP 3  and SP 4  corresponding to white, red, green and blue colors, respectively. 
     Each of the plurality of subpixels SP includes a plurality of thin film transistors (TFTs). For example, each of the plurality of subpixels SP may include a switching TFT, a driving TFT, a storage capacitor and a light emitting diode. 
     In  FIG. 2 , each of the plurality of subpixels SP of the OLED display device  110  according to the present disclosure includes a switching TFT Ts, a driving TFT Td, a storage capacitor Cs and a light emitting diode De. 
     The switching TFT Ts supplies the data signal of the data line DL to the driving TFT Td according to the gate signal of the gate line GL, and the driving TFT Td supplies a high level voltage ELVDD to the light emitting diode De according to the data signal applied to a gate electrode through the switching TFT Ts. 
     The light emitting diode De displays various gray levels using various currents according to voltage differences between a voltage corresponding to the data signal and a low level voltage ELVSS. 
       FIG. 3  is a cross-sectional view showing an organic light emitting diode display device according to a first aspect of the present disclosure.  FIG. 3  exemplarily shows a bottom emission type organic light emitting diode display device. 
     In  FIG. 3 , the OLED display device  110  includes a substrate  120 , insulating layers  122 ,  124  and  126 , color filter layers  132 ,  134  and  136 , wavelength converting layers  146 ,  148  and  150 , a first electrode  160 , a light emitting layer  162  and a second electrode  164 . 
     The substrate  120  includes first to fourth subpixels SP 1  to SP 4 . For example, the first, second, third and fourth subpixels SP 1 , SP 2 , SP 3  and SP 4  may correspond to white, red, green and blue colors, respectively. 
     For example, the first to fourth subpixels SP 1  to SP 4  may constitute a single pixel. The first subpixel SP 1  may have an area ratio of about 0.3 (30%) to about 0.7 (70%) with respect to the single pixel, and each of the second, third and fourth subpixels SP 2 , SP 3  and SP 4  may have an area ratio of about 0.1 (10%) to about 0.3 (30%). 
     A gate insulating layer  122 , an interlayer insulating layer  124  and a passivation layer  126  may be disposed in the first, second, third and fourth subpixels SP 1 , SP 2 , SP 3  and SP 4  on the substrate  120 , and the switching TFT Ts (shown in  FIG. 2 ), the driving TFT Td (shown in  FIG. 2 ) and the storage capacitor Cs (shown in  FIG. 2 ) may be disposed among the gate insulating layer  122 , the interlayer insulating layer  124  and the passivation layer  126 . 
     For example, the gate insulating layer  122  may be disposed between a gate electrode and a semiconductor layer of the switching TFT Ts and the driving TFT Td, and the interlayer insulating layer  124  may be disposed between the gate electrode and a source electrode and between the gate electrode and a drain electrode of the switching TFT Ts and the driving TFT Td. The passivation layer  126  may be disposed on the source electrode and the drain electrode of the switching TFT Ts and the driving TFT Td. 
     First, second and third color filter layers  132 ,  134  and  136  may be disposed in the second, third and fourth subpixels SP 2 , SP 3  and SP 4  on the passivation layer  126 . For example, the first, second and third color filter layers  132 ,  134  and  136  may be selectively penetrated by and may selectively transmit a red colored light, a green colored light and a blue colored light, respectively. 
     A first wavelength converting layer  146  is disposed in the first subpixel SP 1  on the passivation layer  126 , and second and third wavelength converting layers  148  and  150  are disposed on the first and second color filter layers  132  and  134 , respectively. 
     The first wavelength converting layer  146  includes first and second wavelength converting materials, and the second wavelength converting layer  148  includes a third wavelength converting material. The third wavelength converting layer  150  includes a fourth wavelength converting material. 
     The first, second, third and fourth wavelength converting materials of the first, second and third wavelength converting layers  146 ,  148  and  150  absorb a light of a short wavelength and emits a light of a long wavelength. 
     For example, the first, second, third and fourth wavelength converting materials may include a quantum dot or a nanocomposite capable of adjusting an absorption wavelength band and an emission wavelength band according to a concentration or a sort of substances. 
     The first, second, third and fourth wavelength converting materials may have an absorption wavelength band of about 350 nm to about 650 nm and an emission wavelength band of about 450 nm to about 750 nm. An absorption ratio by wavelength and an emission ratio by wavelength of the first, second, third and fourth wavelength converting materials may be adjusted according to a composition ratio or a sort of substances. 
     The first and third wavelength converting materials may be the same as each other, and the second and fourth wavelength converting materials may be the same as each other. 
     The first and second wavelength converting materials may have different absorption wavelength bands and different emission wavelength bands from each other, and the third and fourth wavelength converting materials may have different absorption wavelength bands and different emission wavelength bands from each other. 
     For example, the first and third wavelength converting materials may have an absorption wavelength band of about 450 nm to about 650 nm and an emission wavelength band of about 550 nm to about 750 nm, and the second and fourth wavelength converting materials may have an absorption wavelength band of about 350 nm to about 550 nm and an emission wavelength band of about 450 nm to about 650 nm. 
     As a result, the first and third wavelength converting materials may absorb a blue colored light and may emit a red colored light, and the second and fourth wavelength converting materials may absorb a blue colored light and may emit a green colored light. 
     In another aspect, a blue color filter layer may be disposed on each of the second and third wavelength converting layers  148  and  150  of the second and third subpixels SP 2  and SP 3 . As a result, an incident light to the second and third wavelength converting layers  148  and  150  may be limited to the blue colored light to increase a wavelength conversion efficiency. 
     The first wavelength converting layer  146  may include a first wavelength converting pattern  142  containing the first wavelength converting material and a second wavelength converting pattern  144  containing the second wavelength converting material. 
       FIGS. 4, 5 and 6  are plan views showing a first wavelength converting layer of an organic light emitting diode display device according to first, second and third aspects, respectively, of the present disclosure. 
     In  FIG. 4 , the first wavelength converting layer  146  including the first wavelength converting pattern  142  containing the first wavelength converting material and the second wavelength converting pattern  144  containing the second wavelength converting material is disposed in the first subpixel SP 1  of the OLED display device  110  according to a first aspect of the present disclosure. 
     The first and second wavelength converting patterns  142  and  144  may have a shape of a plurality of bars and may be disposed parallel to and alternate with each other. 
     As a result, the first subpixel SP 1  may be classified into a first region where the first wavelength converting material is disposed, a second region where the second wavelength converting material is disposed and a third region between the first and second wavelength converting patterns  142  and  144  where the first and second wavelength converting materials are not disposed. A white spectrum of a white colored light emitted from the first subpixel SP 1  may be variously adjusted by changing area ratios of the first to third regions. 
     In  FIG. 5 , a first wavelength converting layer  246  including a first wavelength converting pattern  242  containing a first wavelength converting material and a second wavelength converting pattern  244  containing a second wavelength converting material is disposed in a first subpixel SP 1  of an OLED display device according to a second aspect of the present disclosure. 
     The first and second wavelength converting patterns  242  and  244  may have a shape of a net. 
     As a result, the first subpixel SP 1  may be classified into a first region where the first wavelength converting material is disposed, a second region where the second wavelength converting material is disposed and a third region between the first and second wavelength converting patterns  242  and  244  where the first and second wavelength converting materials are not disposed. A white spectrum of a white colored light emitted from the first subpixel SP 1  may be variously adjusted by changing area ratios of the first to third regions. 
     In  FIG. 6 , a first wavelength converting layer  346  including a first wavelength converting pattern  342  containing a first wavelength converting material and a second wavelength converting pattern  344  containing a second wavelength converting material is disposed in a first subpixel SP 1  of an OLED display device according to a third aspect of the present disclosure. 
     The first and second wavelength converting patterns  342  and  344  may have a shape of a rectangle and may be separated from each other to be disposed parallel to each other and at side portions of the first subpixel SP 1 . 
     As a result, the first subpixel SP 1  may be classified into a first region where the first wavelength converting material is disposed, a second region where the second wavelength converting material is disposed and a third region between the first and second wavelength converting patterns  342  and  344  where the first and second wavelength converting materials are not disposed. A white spectrum of a white colored light emitted from the first subpixel SP 1  may be variously adjusted by changing area ratios of the first to third regions. 
     Referring again to  FIG. 3 , a first planarizing layer  152  is disposed on the first, second and third wavelength converting layers  146 ,  148  and  150  and the third color filter layer  136 . 
     For example, the first planarizing layer  152  may include an organic insulating material such as a photo acryl. 
     A first electrode  160 , a light emitting layer  162  and a second electrode  164  are sequentially disposed in the first, second, third and fourth subpixels SP 1 , SP 2 , SP 3  and SP 4  on the first planarizing layer  152 . 
     The first electrode  160 , the light emitting layer  162  and the second electrode  164  constitute a light emitting diode emitting a white colored light. The first electrode  160  may be disposed in each of the first, second, third and fourth subpixels SP 1 , SP 2 , SP 3  and SP 4 , and each of the light emitting layer  162  and the second electrode  164  may be disposed in a whole of the first, second, third and fourth subpixels SP 1 , SP 2 , SP 3  and SP 4 . 
     The first and second electrodes  160  and  164  may be an anode and a cathode, respectively. 
     Although not shown, an encapsulating layer and an encapsulating substrate may be disposed on the second electrode  164 . 
     The light emitting layer  162  may have a plurality of stacks. 
       FIGS. 7 and 8  are cross-sectional views showing a light emitting diode of an organic light emitting diode display device according to first and fourth aspects, respectively, of the present disclosure. 
     In  FIG. 7 , the light emitting diode of the OLED display device  110  according to a first aspect of the present disclosure includes the first electrode  160 , the light emitting layer  162  and the second electrode  164 . 
     The light emitting layer  162  includes first, second and third emitting material layers (EMLs)  166 ,  168  and  170  sequentially disposed on the first electrode  160 . The first, second and third EMLs  166 ,  168  and  170  may emit a first blue colored light, a yellow-green colored light and a second blue colored light, respectively. 
     Although not shown, a hole injecting layer (HIL) and a first hole transporting layer (HTL) may be disposed between the first electrode  160  and the first EML  166 . 
     A first electron transporting layer (ETL), a first charge generating layer (CGL) and a second HTL may be disposed between the first EML  166  and the second EML  168 . 
     A second ETL, a second CGL and a third HTL may be disposed between the second EML  168  and the third EML  170 . 
     A third ETL and an electron injecting layer (EIL) may be disposed between the third EML  170  and the second electrode  164 . 
     The HIL, the first HTL, the first EML  166  and the first ETL may constitute a first stack for emitting a first blue colored light, and the second HTL, the second EML  168  and the second ETL may constitute a second stack for emitting a yellow-green colored light. The third HTL, the third EML  170 , the third ETL and the EIL may constitute a third stack for emitting a second blue colored light. 
     As a result, the light emitting diode of the OLED display device  110  according to a first aspect of the present disclosure may emit a white colored light where the first blue colored light, the yellow-green colored light and the second blue colored light of the first, second and third stacks are mixed. 
     In  FIG. 8 , a light emitting diode of an OLED display device according to a fourth aspect of the present disclosure includes a first electrode  460 , a light emitting layer  462  and a second electrode  464 . 
     The light emitting layer  462  includes first, second, third and fourth emitting material layers (EMLs)  466 ,  468 ,  470  and  472  sequentially disposed on the first electrode  460 . The first, second, third and fourth EMLs  466 ,  468 ,  470  and  472  may emit a first blue colored light, a yellow-green colored light, a green colored light and a second blue colored light, respectively. 
     Although not shown, a hole injecting layer (HIL) and a first hole transporting layer (HTL) may be disposed between the first electrode  460  and the first EML  466 . 
     A first electron transporting layer (ETL), a first charge generating layer (CGL) and a second HTL may be disposed between the first EML  466  and the second EML  468 . 
     A second ETL, a second CGL and a third HTL may be disposed between the third EML  470  and the fourth EML  472 . 
     A third ETL and an electron injecting layer (EIL) may be disposed between the fourth EML  472  and the second electrode  464 . 
     The HIL, the first HTL, the first EML  466  and the first ETL may constitute a first stack for emitting a first blue colored light, and the second HTL, the second EML  468 , the third EML  470  and the second ETL may constitute a second stack for emitting a yellow-green colored light and a green colored light. The third HTL, the fourth EML  472 , the third ETL and the EIL may constitute a third stack for emitting a second blue colored light. 
     As a result, the light emitting diode of the OLED display device according to a fourth aspect of the present disclosure may emit a white colored light where the first blue colored light, the yellow-green colored light, the green colored light and the second blue colored light of the first, second, third and fourth stacks are mixed. 
     Referring again to  FIG. 3 , a first light L 1  of the light emitting layer  162  is converted into fourth, fifth, sixth and seventh lights L 4 , L 5 , L 6  and L 7  by the first, second, third and fourth subpixels SP 1 , SP 2 , SP 3  and SP 4 , respectively, and the fourth, fifth, sixth and seventh lights L 4 , L 5 , L 6  and L 7  are emitted from the first, second, third and fourth subpixels SP 1 , SP 2 , SP 3  and SP 4 , respectively. 
     In the first subpixel SP 1 , the first light L 1  of the light emitting layer  162  passes through a gap region between the first and second wavelength converting patterns  142  and  144  of the first wavelength converting layer  146  without conversion to be emitted as the first light L 1 . The first light L 1  is converted by the first wavelength converting pattern  142  of the first wavelength converting layer  146  to be emitted as the second light L 2 , and the first light L 1  is converted by the second wavelength converting pattern  144  of the first wavelength converting layer  146  to be emitted as the third light L 3 . 
     The first light L 1  of the light emitting layer  162  is converted into the fourth light L 4  where the first light L 1  passing through the gap region between the first and second wavelength converting patterns  142  and  144 , the second light L 2  due to the first wavelength converting pattern  142  and the third light L 3  due to the second wavelength converting pattern  144  are mixed, and the fourth light L 4  is emitted from the first subpixel SP 1 . 
     In the second subpixel SP 2 , the first light L 1  of the light emitting layer  162  is converted into the second light L 2  by the second wavelength converting layer  148 , and the second light L 2  of the second wavelength converting layer  148  is converted by the first color filter layer  132  to be emitted as the fifth light L 5 . 
     The first light L 1  of the light emitting layer  162  is converted into the fifth light L 5  by the second wavelength converting layer  148  and the first color filter layer  132 , and the fifth light L 5  is emitted from the second subpixel SP 2 . 
     In the third subpixel SP 3 , the first light L 1  of the light emitting layer  162  is converted into the third light L 3  by the third wavelength converting layer  150 , and the third light L 3  of the third wavelength converting layer  150  is converted by the second color filter layer  134  to be emitted as the sixth light L 6 . 
     The first light L 1  of the light emitting layer  162  is converted into the sixth light L 6  by the third wavelength converting layer  150  and the second color filter layer  134 , and the sixth light L 6  is emitted from the third subpixel SP 3 . 
     In the fourth subpixel SP 4 , the first light L 1  of the light emitting layer  162  is converted by the third color filter layer  136  to be emitted as the seventh light L 7 . 
     The first light L 1  of the light emitting layer  162  is converted into the seventh light L 7  by the third color filter layer  136 , and the seventh light L 7  is emitted from the fourth subpixel SP 4 . 
     The fourth, fifth, sixth and seventh lights L 4 , L 5 , L 6  and L 7  may be white, red, green and blue colored lights, respectively. 
       FIG. 9  is a view showing a spectrum of a fourth light of a first subpixel of an organic light emitting diode display device according to a first aspect of the present disclosure, and  FIG. 10  is a view showing spectrums of fifth, sixth and seventh lights of second, third and fourth subpixels of an organic light emitting diode display device according to a first aspect of the present disclosure. 
     In  FIG. 9 , the fourth light L 4  emitted from the first subpixel SP 1  of the OLED display device  110  according to a first aspect of the present disclosure may be a white colored light including a first component C 1  corresponding to a blue colored light, a second component C 2  corresponding to a green colored light and a third component C 3  corresponding to a red colored light. 
     Spectrums (intensities with respect to wavelengths) of the second and third components C 2  and C 3  may be variously adjusted by changing a composition ratio or a sort of substances of the first and second wavelength converting materials of the first and second wavelength converting patterns  142  and  144  of the first wavelength converting layer  146 . As a result, a spectrum of the fourth light L 4  emitted from the first subpixel SP 1  may be variously adjusted. 
     In  FIG. 10 , the fifth, sixth and seventh lights L 5 , L 6  and L 7  emitted from the second, third and fourth subpixels SP 2 , SP 3  and SP 4  of the OLED display device  110  according to a first aspect of the present disclosure may be red, green and blue colored lights, respectively. 
     A spectrum of the fifth light L 5  emitted from the second subpixel SP 2  may be variously adjusted by changing a composition ratio or a sort of substances of the third wavelength converting material of the second wavelength converting layer  148 . 
     A spectrum of the sixth light L 6  emitted from the third subpixel SP 3  may be variously adjusted by changing a composition ratio or a sort of substances of the fourth wavelength converting material of the third wavelength converting layer  150 . 
     In the OLED display device  110  according to a first aspect of the present disclosure, the white spectrum of the fourth light L 4  of the first subpixel SP 1 , the red spectrum of the fifth light L 5  of the second subpixel SP 2  and the green spectrum of the sixth light L 6  of the third subpixel SP 3  may be variously adjusted by changing a composition ratio or a sort of substances of the first, second, third and fourth wavelength converting materials. Accordingly, various white spectrums of a high color temperature and a high luminance may be obtained. 
     In addition, since the white colored light of the light emitting layer  162  is converted into the red colored light and the green colored light using the second and third wavelength converting patterns  148  and  150  of the second and third subpixels SP 2  and SP 3 , thicknesses of the first and second color filter layers  132  and  134  of the second and third subpixel SP 2  and SP 3  is reduced. As a result, a light emitting efficiency is improved. 
     Further, since the red, green and blue colored lights are emitted through the first, second and third color filters  132 ,  134  and  136 , respectively, of the second, third and fourth subpixels SP 2 , SP 3  and SP 4 , a color reproducibility is improved. 
     In another aspect, a light extraction efficiency may be improved using a microlens. 
       FIG. 11  is a cross-sectional view showing an organic light emitting diode display device according to a fifth aspect of the present disclosure. Illustrations on parts of the fifth aspect the same as those of the first aspect will be omitted. 
     In  FIG. 11 , the OLED display device  510  includes a substrate  520 , insulating layers  522 ,  524  and  526 , color filter layers  532 ,  534  and  536 , wavelength converting layers  546 ,  548  and  550 , a plurality of microlenses  538 , a first electrode  560 , a light emitting layer  562  and a second electrode  564 . 
     The substrate  520  includes first to fourth subpixels SP 1  to SP 4 . For example, the first, second, third and fourth subpixels SP 1 , SP 2 , SP 3  and SP 4  may correspond to white, red, green and blue colors, respectively. 
     For example, the first to fourth subpixels SP 1  to SP 4  may constitute a single pixel. The first subpixel SP 1  may have an area ratio of about 0.3 (30%) to about 0.7 (70%) with respect to the single pixel, and each of the second, third and fourth subpixels SP 2 , SP 3  and SP 4  may have an area ratio of about 0.1 (10%) to about 0.3 (30%). 
     A gate insulating layer  522 , an interlayer insulating layer  524  and a passivation layer  526  may be disposed in the first, second, third and fourth subpixels SP 1 , SP 2 , SP 3  and SP 4  on the substrate  520 , and the switching TFT Ts (shown in  FIG. 2 ), the driving TFT Td (shown in  FIG. 2 ) and the storage capacitor Cs (shown in  FIG. 2 ) may be disposed among the gate insulating layer  522 , the interlayer insulating layer  524  and the passivation layer  526 . 
     For example, the gate insulating layer  522  may be disposed between a gate electrode and a semiconductor layer of the switching TFT Ts and the driving TFT Td, and the interlayer insulating layer  524  may be disposed between the gate electrode and a source electrode and between the gate electrode and a drain electrode of the switching TFT Ts and the driving TFT Td. The passivation layer  526  may be disposed on the source electrode and the drain electrode of the switching TFT Ts and the driving TFT Td. 
     First, second and third color filter layers  532 ,  534  and  536  may be disposed in the second, third and fourth subpixels SP 2 , SP 3  and SP 4  on the passivation layer  526 . 
     A first wavelength converting layer  546  is disposed in the first subpixel SP 1  on the passivation layer  526 , and second and third wavelength converting layers  548  and  550  are disposed on the first and second color filter layers  532  and  534 , respectively. 
     The first wavelength converting layer  546  includes first and second wavelength converting materials, and the second wavelength converting layer  548  includes a third wavelength converting material. The third wavelength converting layer  550  includes a fourth wavelength converting material. 
     For example, the first, second, third and fourth wavelength converting materials may include a quantum dot or a nanocomposite capable of adjusting an absorption wavelength band and an emission wavelength band according to a concentration or a sort of substances. 
     The first, second, third and fourth wavelength converting materials may have an absorption wavelength band of about 350 nm to about 650 nm and an emission wavelength band of about 450 nm to about 750 nm. An absorption ratio by wavelength and an emission ratio by wavelength of the first, second, third and fourth wavelength converting materials may be adjusted according to a composition ratio or a sort of substances. 
     For example, the first and third wavelength converting materials may absorb a blue colored light and may emit a red colored light, and the second and fourth wavelength converting materials may absorb a blue colored light and may emit a green colored light. 
     A first planarizing layer  552  is disposed on the first, second and third wavelength converting layers  546 ,  548  and  550  and the third color filter layer  536 , and a plurality of microlenses  538  having an uneven shape are disposed on a top surface of the first planarizing layer  552 . 
     For example, the first planarizing layer  552  and the plurality of microlenses  538  may include an organic insulating material such as a photo acryl. 
     In addition, the first planarizing layer  552  and the plurality of microlenses  538  may be formed through a single photolithographic process using a half transmissive mask including a transmissive area, a half transmissive area and a blocking area. 
     The first planarizing layer  552  and the plurality of microlenses  538  may have the same refractive index. For example, each of the first planarizing layer  552  and the plurality of microlenses  538  may have a refractive index of about 1.45 to about 1.55. 
     Each of the plurality of microlenses  538  may have a shape of a convex lens. 
     Although the plurality of microlenses  538  are spaced apart from each other in the fifth aspect, at least two of the plurality of microlenses  538  may contact each other in another aspect. 
     A first electrode  560 , a light emitting layer  562  and a second electrode  564  are sequentially disposed in the first, second, third and fourth subpixels SP 1 , SP 2 , SP 3  and SP 4  on the first planarizing layer  552 . The first electrode  560 , the light emitting layer  562  and the second electrode  564  constitute a light emitting diode emitting a white colored light. 
     The first electrode  560 , the light emitting layer  562  and the second electrode  564  may have an uneven shape due to the plurality of microlenses  538 . 
     In the OLED display device  510  according to a fifth aspect of the present disclosure, a light blocked by a total reflection at an interface between the first electrode  560  and the first planarizing layer  552  is minimized due to the plurality of microlenses  538 . As a result, a light emitting efficiency is improved. 
     In addition, the white spectrum of the first subpixel SP 1 , the red spectrum of the second subpixel SP 2  and the green spectrum of the third subpixel SP 3  may be variously adjusted by changing a composition ratio or a sort of substances of the first, second, third and fourth wavelength converting materials. Accordingly, various white spectrums of a high color temperature and a high luminance may be obtained. 
     Further, since the white colored light of the light emitting layer  562  is converted into the red colored light and the green colored light using the second and third wavelength converting patterns  548  and  550  of the second and third subpixels SP 2  and SP 3 , thicknesses of the first and second color filter layers  532  and  534  of the second and third subpixel SP 2  and SP 3  is reduced. As a result, a light emitting efficiency is improved. 
     Moreover, since the red, green and blue colored lights are emitted through the first, second and third color filters  532 ,  534  and  536 , respectively, of the second, third and fourth subpixels SP 2 , SP 3  and SP 4 , a color reproducibility is improved. 
     In another aspect, a plurality of microlenses may have a shape of a concave lens and may be disposed to contact each other. 
       FIG. 12  is a cross-sectional view showing an organic light emitting diode display device according to a sixth aspect of the present disclosure. Illustrations on parts of the sixth aspect the same as those of the first aspect will be omitted. 
     In  FIG. 12 , the OLED display device  610  includes a substrate  620 , insulating layers  622 ,  624  and  626 , color filter layers  632 ,  634  and  636 , wavelength converting layers  646 ,  648  and  650 , a plurality of microlenses  638 , a first electrode  660 , a light emitting layer  662  and a second electrode  664 . 
     The substrate  620  includes first to fourth subpixels SP 1  to SP 4 . For example, the first, second, third and fourth subpixels SP 1 , SP 2 , SP 3  and SP 4  may correspond to white, red, green and blue colors, respectively. 
     For example, the first to fourth subpixels SP 1  to SP 4  may constitute a single pixel. The first subpixel SP 1  may have an area ratio of about 0.3 (30%) to about 0.7 (70%) with respect to the single pixel, and each of the second, third and fourth subpixels SP 2 , SP 3  and SP 4  may have an area ratio of about 0.1 (10%) to about 0.3 (30%). 
     A gate insulating layer  622 , an interlayer insulating layer  624  and a passivation layer  626  may be disposed in the first, second, third and fourth subpixels SP 1 , SP 2 , SP 3  and SP 4  on the substrate  620 , and the switching TFT Ts (shown in  FIG. 2 ), the driving TFT Td (shown in  FIG. 2 ) and the storage capacitor Cs (shown in  FIG. 2 ) may be disposed among the gate insulating layer  622 , the interlayer insulating layer  624  and the passivation layer  626 . 
     For example, the gate insulating layer  622  may be disposed between a gate electrode and a semiconductor layer of the switching TFT Ts and the driving TFT Td, and the interlayer insulating layer  624  may be disposed between the gate electrode and a source electrode and between the gate electrode and a drain electrode of the switching TFT Ts and the driving TFT Td. The passivation layer  626  may be disposed on the source electrode and the drain electrode of the switching TFT Ts and the driving TFT Td. 
     First, second and third color filter layers  632 ,  634  and  636  may be disposed in the second, third and fourth subpixels SP 2 , SP 3  and SP 4  on the passivation layer  626 . 
     A first wavelength converting layer  646  is disposed in the first subpixel SP 1  on the passivation layer  626 , and second and third wavelength converting layers  648  and  650  are disposed on the first and second color filter layers  632  and  634 , respectively. 
     The first wavelength converting layer  646  includes first and second wavelength converting materials, and the second wavelength converting layer  648  includes a third wavelength converting material. The third wavelength converting layer  650  includes a fourth wavelength converting material. 
     For example, the first, second, third and fourth wavelength converting materials may include a quantum dot or a nanocomposite capable of adjusting an absorption wavelength band and an emission wavelength band according to a concentration or a sort of substances. 
     The first, second, third and fourth wavelength converting materials may have an absorption wavelength band of about 350 nm to about 650 nm and an emission wavelength band of about 450 nm to about 750 nm. An absorption ratio by wavelength and an emission ratio by wavelength of the first, second, third and fourth wavelength converting materials may be adjusted according to a composition ratio or a sort of substances. 
     For example, the first and third wavelength converting materials may absorb a blue colored light and may emit a red colored light, and the second and fourth wavelength converting materials may absorb a blue colored light and may emit a green colored light. 
     A first planarizing layer  652  is disposed on the first, second and third wavelength converting layers  646 ,  648  and  650  and the third color filter layer  636 , and a plurality of microlenses  638  having an uneven shape are disposed on a top surface of the first planarizing layer  652 . 
     For example, the first planarizing layer  652  and the plurality of microlenses  638  may include an organic insulating material such as a photo acryl. 
     In addition, the first planarizing layer  652  and the plurality of microlenses  638  may be formed through a single photolithographic process using a half transmissive mask including a transmissive area, a half transmissive area and a blocking area. 
     The first planarizing layer  652  and the plurality of microlenses  638  may have the same refractive index. For example, each of the first planarizing layer  652  and the plurality of microlenses  638  may have a refractive index of about 1.45 to about 1.55. 
     Each of the plurality of microlenses  638  may have a shape of a concave lens and may be disposed to contact each other. 
     Although the plurality of microlenses  638  contact each other in the sixth aspect, at least two of the plurality of microlenses  638  may be spaced apart from each other in another aspect. 
     A first electrode  660 , a light emitting layer  662  and a second electrode  664  are sequentially disposed in the first, second, third and fourth subpixels SP 1 , SP 2 , SP 3  and SP 4  on the first planarizing layer  652 . The first electrode  660 , the light emitting layer  662  and the second electrode  664  constitute a light emitting diode emitting a white colored light. 
     The first electrode  660 , the light emitting layer  662  and the second electrode  664  may have an uneven shape due to the plurality of microlenses  638 . 
     In the OLED display device  610  according to a sixth aspect of the present disclosure, a light blocked by a total reflection at an interface between the first electrode  660  and the first planarizing layer  652  is minimized due to the plurality of microlenses  638 . As a result, a light emitting efficiency is improved. 
     In addition, the white spectrum of the first subpixel SP 1 , the red spectrum of the second subpixel SP 2  and the green spectrum of the third subpixel SP 3  may be variously adjusted by changing a composition ratio or a sort of substances of the first, second, third and fourth wavelength converting materials. Accordingly, various white spectrums of a high color temperature and a high luminance may be obtained. 
     Further, since the white colored light of the light emitting layer  662  is converted into the red colored light and the green colored light using the second and third wavelength converting patterns  648  and  650  of the second and third subpixels SP 2  and SP 3 , thicknesses of the first and second color filter layers  632  and  634  of the second and third subpixel SP 2  and SP 3  is reduced. As a result, a light emitting efficiency is improved. 
     Moreover, since the red, green and blue colored lights are emitted through the first, second and third color filters  632 ,  634  and  636 , respectively, of the second, third and fourth subpixels SP 2 , SP 3  and SP 4 , a color reproducibility is improved. 
       FIG. 13  is a cross-sectional view showing an organic light emitting diode display device according to a seventh aspect of the present disclosure. Illustrations on parts of the seventh aspect the same as those of the first aspect will be omitted. 
     In  FIG. 13 , the OLED display device  710  includes a substrate  720 , insulating layers  722 ,  724  and  726 , color filter layers  732 ,  734  and  736 , wavelength converting layers  746 ,  748  and  750 , a plurality of microlenses  738 , a first electrode  760 , a light emitting layer  762  and a second electrode  764 . 
     The substrate  720  includes first to fourth subpixels SP 1  to SP 4 . For example, the first, second, third and fourth subpixels SP 1 , SP 2 , SP 3  and SP 4  may correspond to white, red, green and blue colors, respectively. 
     For example, the first to fourth subpixels SP 1  to SP 4  may constitute a single pixel. The first subpixel SP 1  may have an area ratio of about 0.3 (30%) to about 0.7 (70%) with respect to the single pixel, and each of the second, third and fourth subpixels SP 2 , SP 3  and SP 4  may have an area ratio of about 0.1 (10%) to about 0.3 (30%). 
     A gate insulating layer  722 , an interlayer insulating layer  724  and a passivation layer  726  may be disposed in the first, second, third and fourth subpixels SP 1 , SP 2 , SP 3  and SP 4  on the substrate  720 , and the switching TFT Ts (shown in  FIG. 2 ), the driving TFT Td (shown in  FIG. 2 ) and the storage capacitor Cs (shown in  FIG. 2 ) may be disposed among the gate insulating layer  722 , the interlayer insulating layer  724  and the passivation layer  726 . 
     For example, the gate insulating layer  722  may be disposed between a gate electrode and a semiconductor layer of the switching TFT Ts and the driving TFT Td, and the interlayer insulating layer  724  may be disposed between the gate electrode and a source electrode and between the gate electrode and a drain electrode of the switching TFT Ts and the driving TFT Td. The passivation layer  726  may be disposed on the source electrode and the drain electrode of the switching TFT Ts and the driving TFT Td. 
     First, second and third color filter layers  732 ,  734  and  736  may be disposed in the second, third and fourth subpixels SP 2 , SP 3  and SP 4  on the passivation layer  726 . 
     A first wavelength converting layer  746  is disposed in the first subpixel SP 1  on the passivation layer  726 , and second and third wavelength converting layers  748  and  750  are disposed on the first and second color filter layers  732  and  734 , respectively. 
     The first wavelength converting layer  746  includes first and second wavelength converting materials, and the second wavelength converting layer  748  includes a third wavelength converting material. The third wavelength converting layer  750  includes a fourth wavelength converting material. 
     For example, the first, second, third and fourth wavelength converting materials may include a quantum dot or a nanocomposite capable of adjusting an absorption wavelength band and an emission wavelength band according to a concentration or a sort of substances. 
     The first, second, third and fourth wavelength converting materials may have an absorption wavelength band of about 350 nm to about 650 nm and an emission wavelength band of about 450 nm to about 750 nm. An absorption ratio by wavelength and an emission ratio by wavelength of the first, second, third and fourth wavelength converting materials may be adjusted according to a composition ratio or a sort of substances. 
     For example, the first and third wavelength converting materials may absorb a blue colored light and may emit a red colored light, and the second and fourth wavelength converting materials may absorb a blue colored light and may emit a green colored light. 
     A first planarizing layer  752  is disposed on the first, second and third wavelength converting layers  746 ,  748  and  750  and the third color filter layer  736 , and a plurality of microlenses  738  having an uneven shape are disposed on a top surface of the first planarizing layer  752 . 
     For example, the first planarizing layer  752  and the plurality of microlenses  738  may include an organic insulating material such as a photo acryl. 
     The first planarizing layer  752  and the plurality of microlenses  738  may have the different refractive indexes. For example, a refractive index of the first planarizing layer  752  may be greater than a refractive index of the plurality of microlenses  738 . 
     For example, the first planarizing layer  752  may have a refractive index of about 1.45 to about 1.55, and the plurality of microlenses  738  may have a refractive index equal to or smaller than about 1.4. 
     Although each of the plurality of microlenses  738  exemplarily has a shape of a convex lens in the seventh aspect, each of the plurality of microlenses  738  may have a shape of a concave lens in another aspect. 
     Although the plurality of microlenses  738  are spaced apart from each other in the seventh aspect, at least two of the plurality of microlenses  738  may contact each other in another aspect. 
     A first electrode  760 , a light emitting layer  762  and a second electrode  764  are sequentially disposed in the first, second, third and fourth subpixels SP 1 , SP 2 , SP 3  and SP 4  on the first planarizing layer  752 . The first electrode  760 , the light emitting layer  762  and the second electrode  764  constitute a light emitting diode emitting a white colored light. 
     The first electrode  760 , the light emitting layer  762  and the second electrode  764  may have an uneven shape due to the plurality of microlenses  738 . 
     In the OLED display device  710  according to a seventh aspect of the present disclosure, a light blocked by a total reflection at an interface between the first electrode  760  and the first planarizing layer  752  is minimized due to the plurality of microlenses  738 . As a result, a light emitting efficiency is improved. 
     In addition, the white spectrum of the first subpixel SP 1 , the red spectrum of the second subpixel SP 2  and the green spectrum of the third subpixel SP 3  may be variously adjusted by changing a composition ratio or a sort of substances of the first, second, third and fourth wavelength converting materials. Accordingly, various white spectrums of a high color temperature and a high luminance may be obtained. 
     Further, since the white colored light of the light emitting layer  762  is converted into the red colored light and the green colored light using the second and third wavelength converting patterns  748  and  750  of the second and third subpixels SP 2  and SP 3 , thicknesses of the first and second color filter layers  732  and  734  of the second and third subpixel SP 2  and SP 3  is reduced. As a result, a light emitting efficiency is improved. 
     Moreover, since the red, green and blue colored lights are emitted through the first, second and third color filters  732 ,  734  and  736 , respectively, of the second, third and fourth subpixels SP 2 , SP 3  and SP 4 , a color reproducibility is improved. 
       FIG. 14  is a cross-sectional view showing an organic light emitting diode display device according to an eighth aspect of the present disclosure. Illustrations on parts of the eighth aspect the same as those of the first aspect will be omitted. 
     In  FIG. 14 , the OLED display device  810  includes a substrate  820 , insulating layers  822 ,  824  and  826 , color filter layers  832 ,  834  and  836 , wavelength converting layers  846 ,  848  and  850 , a plurality of microlenses  838 , a first electrode  860 , a light emitting layer  862  and a second electrode  864 . 
     The substrate  820  includes first to fourth subpixels SP 1  to SP 4 . For example, the first, second, third and fourth subpixels SP 1 , SP 2 , SP 3  and SP 4  may correspond to white, red, green and blue colors, respectively. 
     For example, the first to fourth subpixels SP 1  to SP 4  may constitute a single pixel. The first subpixel SP 1  may have an area ratio of about 0.3 (30%) to about 0.7 (70%) with respect to the single pixel, and each of the second, third and fourth subpixels SP 2 , SP 3  and SP 4  may have an area ratio of about 0.1 (10%) to about 0.3 (30%). 
     A gate insulating layer  822 , an interlayer insulating layer  824  and a passivation layer  826  may be disposed in the first, second, third and fourth subpixels SP 1 , SP 2 , SP 3  and SP 4  on the substrate  820 , and the switching TFT Ts (shown in  FIG. 2 ), the driving TFT Td (shown in  FIG. 2 ) and the storage capacitor Cs (shown in  FIG. 2 ) may be disposed among the gate insulating layer  822 , the interlayer insulating layer  824  and the passivation layer  826 . 
     For example, the gate insulating layer  822  may be disposed between a gate electrode and a semiconductor layer of the switching TFT Ts and the driving TFT Td, and the interlayer insulating layer  824  may be disposed between the gate electrode and a source electrode and between the gate electrode and a drain electrode of the switching TFT Ts and the driving TFT Td. The passivation layer  826  may be disposed on the source electrode and the drain electrode of the switching TFT Ts and the driving TFT Td. 
     First, second and third color filter layers  832 ,  834  and  836  may be disposed in the second, third and fourth subpixels SP 2 , SP 3  and SP 4  on the passivation layer  826 . 
     A plurality of microlenses  838  having an uneven shape are disposed on the passivation layer  826  in the first subpixel SP 1  and on the first, second and third color filter layers  832 ,  834  and  836 , and a first planarizing layer  840  is disposed on the plurality of microlenses  838 . 
     First, second and third wavelength converting layers  846 ,  848  and  850  are disposed on the first planarizing layer  840  in the first, second and third subpixels SP 1 , SP 2  and SP 3 , respectively. 
     The first wavelength converting layer  846  includes first and second wavelength converting materials, and the second wavelength converting layer  848  includes a third wavelength converting material. The third wavelength converting layer  850  includes a fourth wavelength converting material. 
     For example, the first, second, third and fourth wavelength converting materials may include a quantum dot or a nanocomposite capable of adjusting an absorption wavelength band and an emission wavelength band according to a concentration or a sort of substances. 
     The first, second, third and fourth wavelength converting materials may have an absorption wavelength band of about 350 nm to about 650 nm and an emission wavelength band of about 450 nm to about 750 nm. An absorption ratio by wavelength and an emission ratio by wavelength of the first, second, third and fourth wavelength converting materials may be adjusted according to a composition ratio or a sort of substances. 
     For example, the first and third wavelength converting materials may absorb a blue colored light and may emit a red colored light, and the second and fourth wavelength converting materials may absorb a blue colored light and may emit a green colored light. 
     A second planarizing layer  852  is disposed on the first, second and third wavelength converting layers  846 ,  848  and  850  and on the first planarizing layer  840  of the fourth subpixel SP 4 . 
     For example, the first and second planarizing layers  840  and  852  and the plurality of microlenses  838  may include an organic insulating material such as a photo acryl. 
     The first and second planarizing layers  840  and  852  may have the same refractive index, and the first and second planarizing layers  840  and  852  and the plurality of microlenses  838  may have the different refractive indexes. 
     For example, the first and second planarizing layers  840  and  852  may have a refractive index of about 1.45 to about 1.55, and the plurality of microlenses  838  may have a refractive index equal to or smaller than about 1.4. 
     Although each of the plurality of microlenses  838  exemplarily has a shape of a convex lens in the eighth aspect, each of the plurality of microlenses  838  may have a shape of a concave lens in another aspect. 
     Although the plurality of microlenses  838  are spaced apart from each other in the eighth aspect, at least two of the plurality of microlenses  838  may contact each other in another aspect. 
     A first electrode  860 , a light emitting layer  862  and a second electrode  864  are sequentially disposed in the first, second, third and fourth subpixels SP 1 , SP 2 , SP 3  and SP 4  on the second planarizing layer  852 . The first electrode  860 , the light emitting layer  862  and the second electrode  864  constitute a light emitting diode emitting a white colored light. 
     In the OLED display device  810  according to an eighth aspect of the present disclosure, a light blocked by a total reflection at an interface between the first planarizing layer  840  and the substrate  820  and at an interface between the first planarizing layer  840  and the color filter layers  832 ,  834  and  836  is minimized due to the plurality of microlenses  838 . As a result, a light emitting efficiency is improved. 
     In addition, the white spectrum of the first subpixel SP 1 , the red spectrum of the second subpixel SP 2  and the green spectrum of the third subpixel SP 3  may be variously adjusted by changing a composition ratio or a sort of substances of the first, second, third and fourth wavelength converting materials. Accordingly, various white spectrums of a high color temperature and a high luminance may be obtained. 
     Further, since the white colored light of the light emitting layer  862  is converted into the red colored light and the green colored light using the second and third wavelength converting patterns  848  and  850  of the second and third subpixels SP 2  and SP 3 , thicknesses of the first and second color filter layers  832  and  834  of the second and third subpixel SP 2  and SP 3  is reduced. As a result, a light emitting efficiency is improved. 
     Moreover, since the red, green and blue colored lights are emitted through the first, second and third color filters  832 ,  834  and  836 , respectively, of the second, third and fourth subpixels SP 2 , SP 3  and SP 4 , a color reproducibility is improved. 
       FIG. 15  is a cross-sectional view showing an organic light emitting diode display device according to a ninth aspect of the present disclosure. Illustrations on parts of the ninth aspect the same as those of the first aspect will be omitted. 
     In  FIG. 15 , the OLED display device  910  includes a substrate  920 , insulating layers  922 ,  924  and  926 , color filter layers  932 ,  934  and  936 , wavelength converting layers  946 ,  948  and  950 , a plurality of microlenses  938 , a first electrode  960 , a light emitting layer  962  and a second electrode  964 . 
     The substrate  920  includes first to fourth subpixels SP 1  to SP 4 . For example, the first, second, third and fourth subpixels SP 1 , SP 2 , SP 3  and SP 4  may correspond to white, red, green and blue colors, respectively. 
     For example, the first to fourth subpixels SP 1  to SP 4  may constitute a single pixel. The first subpixel SP 1  may have an area ratio of about 0.3 (30%) to about 0.7 (70%) with respect to the single pixel, and each of the second, third and fourth subpixels SP 2 , SP 3  and SP 4  may have an area ratio of about 0.1 (10%) to about 0.3 (30%). 
     A gate insulating layer  922 , an interlayer insulating layer  924  and a passivation layer  926  may be disposed in the first, second, third and fourth subpixels SP 1 , SP 2 , SP 3  and SP 4  on the substrate  920 , and the switching TFT Ts (shown in  FIG. 2 ), the driving TFT Td (shown in  FIG. 2 ) and the storage capacitor Cs (shown in  FIG. 2 ) may be disposed among the gate insulating layer  922 , the interlayer insulating layer  924  and the passivation layer  926 . 
     For example, the gate insulating layer  922  may be disposed between a gate electrode and a semiconductor layer of the switching TFT Ts and the driving TFT Td, and the interlayer insulating layer  924  may be disposed between the gate electrode and a source electrode and between the gate electrode and a drain electrode of the switching TFT Ts and the driving TFT Td. The passivation layer  926  may be disposed on the source electrode and the drain electrode of the switching TFT Ts and the driving TFT Td. 
     A plurality of microlenses  938  having an uneven shape are disposed on the passivation layer  926  in the first, second, third and fourth subpixels SP 1 , SP 2 , SP 3  and SP 4 . 
     First, second and third color filter layers  932 ,  934  and  936  may be disposed in the second, third and fourth subpixels SP 2 , SP 3  and SP 4  on the plurality of microlenses  938 . 
     A first planarizing layer  940  is disposed on the plurality of microlenses  938  of the first subpixel SP 1  and on the first, second and third color filter layers  932 ,  934  and  936 . 
     First, second and third wavelength converting layers  946 ,  948  and  950  are disposed on the first planarizing layer  940  in the first, second and third subpixels SP 1 , SP 2  and SP 3 , respectively. 
     The first wavelength converting layer  946  includes first and second wavelength converting materials, and the second wavelength converting layer  948  includes a third wavelength converting material. The third wavelength converting layer  950  includes a fourth wavelength converting material. 
     For example, the first, second, third and fourth wavelength converting materials may include a quantum dot or a nanocomposite capable of adjusting an absorption wavelength band and an emission wavelength band according to a concentration or a sort of substances. 
     The first, second, third and fourth wavelength converting materials may have an absorption wavelength band of about 350 nm to about 650 nm and an emission wavelength band of about 450 nm to about 750 nm. An absorption ratio by wavelength and an emission ratio by wavelength of the first, second, third and fourth wavelength converting materials may be adjusted according to a composition ratio or a sort of substances. 
     For example, the first and third wavelength converting materials may absorb a blue colored light and may emit a red colored light, and the second and fourth wavelength converting materials may absorb a blue colored light and may emit a green colored light. 
     A second planarizing layer  952  is disposed on the first, second and third wavelength converting layers  946 ,  948  and  950  and on the first planarizing layer  940  of the fourth subpixel SP 4 . 
     For example, the first and second planarizing layers  940  and  952  and the plurality of microlenses  938  may include an organic insulating material such as a photo acryl. 
     The first and second planarizing layers  940  and  952  may have the same refractive index, and the first and second planarizing layers  940  and  952  and the plurality of microlenses  938  may have the different refractive indexes. 
     For example, the first and second planarizing layers  940  and  952  may have a refractive index of about 1.45 to about 1.55, and the plurality of microlenses  938  may have a refractive index equal to or smaller than about 1.4. 
     Although each of the plurality of microlenses  938  exemplarily has a shape of a convex lens in the ninth aspect, each of the plurality of microlenses  938  may have a shape of a concave lens in another aspect. 
     Although the plurality of microlenses  938  are spaced apart from each other in the ninth aspect, at least two of the plurality of microlenses  938  may contact each other in another aspect. 
     A first electrode  960 , a light emitting layer  962  and a second electrode  964  are sequentially disposed in the first, second, third and fourth subpixels SP 1 , SP 2 , SP 3  and SP 4  on the second planarizing layer  952 . The first electrode  960 , the light emitting layer  962  and the second electrode  964  constitute a light emitting diode emitting a white colored light. 
     In the OLED display device  910  according to a ninth aspect of the present disclosure, a light blocked by a total reflection at an interface between the first planarizing layer  940  and the substrate  920  and at an interface between the color filter layers  932 ,  934  and  936  and the substrate  920  is minimized due to the plurality of microlenses  938 . As a result, a light emitting efficiency is improved. 
     In addition, the white spectrum of the first subpixel SP 1 , the red spectrum of the second subpixel SP 2  and the green spectrum of the third subpixel SP 3  may be variously adjusted by changing a composition ratio or a sort of substances of the first, second, third and fourth wavelength converting materials. Accordingly, various white spectrums of a high color temperature and a high luminance may be obtained. 
     Further, since the white colored light of the light emitting layer  962  is converted into the red colored light and the green colored light using the second and third wavelength converting patterns  948  and  950  of the second and third subpixels SP 2  and SP 3 , thicknesses of the first and second color filter layers  932  and  934  of the second and third subpixel SP 2  and SP 3  is reduced. As a result, a light emitting efficiency is improved. 
     Moreover, since the red, green and blue colored lights are emitted through the first, second and third color filters  932 ,  934  and  936 , respectively, of the second, third and fourth subpixels SP 2 , SP 3  and SP 4 , a color reproducibility is improved. 
     Consequently, in the OLED display device according to the present disclosure, since the white colored light of the light emitting layer is converted into the light having a different color using the wavelength converting layer, various white spectrums of a high color temperature and a high luminance may be obtained. 
     In addition, since the white colored light of the light emitting layer is converted into the light having a different color using the wavelength converting layer and the light having a specific color among the white colored light of the light emitting layer is transmitted through the color filter layer, various white spectrums are obtained and a color reproducibility is improved. 
     The present disclosure also relates to and is not limited to the following aspects. 
     In the present disclosure, an organic light emitting diode display device includes: a substrate having first, second, third and fourth subpixels; first, second and third color filter layers in the second, third and fourth subpixels, respectively, on the substrate; a first wavelength converting layer in the first subpixel on the substrate and second and third wavelength converting layers on the first and second color filter layers, respectively; and a light emitting diode in each of the first, second, third and fourth subpixels over the first, second and third wavelength converting. 
     In the present disclosure, the first wavelength converting layer includes a first wavelength converting pattern of a first wavelength converting material and a second wavelength converting pattern of a second wavelength converting material, and each of the second and third wavelength converting layers includes third and fourth wavelength converting materials. 
     In the present disclosure, each of the first, second, third and fourth wavelength converting materials includes one of a quantum dot and a nanocomposite. 
     In the present disclosure, each of the first, second, third and fourth wavelength converting materials has an absorption wavelength band of 350 nm to 650 nm and an emission wavelength band of 450 nm to 750 nm. 
     In the present disclosure, each of the first and second wavelength converting patterns has one of a shape of a plurality of bars, a shape of a net and a shape of a rectangle. 
     In the present disclosure, the first, second, third and fourth subpixels correspond to white, red, green and blue colors, respectively, the first, second and third color filter layers selectively transmit red, green and blue colored lights, respectively, the first and third wavelength converting materials absorb the blue colored light and emit the red colored light, and the second and fourth wavelength converting materials absorb the blue colored light and emit the green colored light. 
     In the present disclosure, the light emitting diode includes a first electrode, a light emitting layer and a second electrode, and the light emitting layer includes first, second and third emitting material layers emitting first blue, yellow-green and second blue colored lights, respectively. 
     In the present disclosure, the light emitting diode includes a first electrode, a light emitting layer and a second electrode, and the light emitting layer includes first, second, third and fourth emitting material layers emitting first blue, yellow-green, green and second blue colored lights, respectively. 
     In the present disclosure, the organic light emitting diode display device further includes a plurality of microlenses disposed between the substrate and the light emitting diode and having an uneven shape. 
     In the present disclosure, each of the plurality of microlenses has one of a shape of a convex lens and a shape of a concave lens. 
     In the present disclosure, the organic light emitting diode display device further includes a first planarizing layer between the first, second and third wavelength converting layers and the light emitting diode, and the plurality of microlenses are disposed on the first planarizing layer. 
     In the present disclosure, a refractive index of the first planarizing layer is a same as a refractive index of the plurality of microlenses. 
     In the present disclosure, a refractive index of the first planarizing layer is greater than a refractive index of the plurality of microlenses. 
     In the present disclosure, the organic light emitting diode display device further includes: a first planarizing layer between the first, second and third color filter layers and the first, second and third wavelength converting layers; and a second planarizing layer between the first, second and third wavelength converting layers and the light emitting diode, and the plurality of microlenses are disposed between the substrate and the first planarizing layer. 
     In the present disclosure, the plurality of microlenses are disposed between the first, second and third color filter layers and the first planarizing layer. 
     In the present disclosure, the plurality of microlenses are disposed between the substrate and the first, second and third color filter layers. 
     It will be apparent to those skilled in the art that various modifications and variation can be made in the present disclosure without departing from the spirit or scope of the disclosure. Thus, it is intended that the present disclosure cover the modifications and variations of this disclosure provided they come within the scope of the appended claims and their equivalents.