Organic light emitting diode display device

Abstract

An organic light emitting diode display device includes a substrate including first to fourth sub-pixels, each of the first to fourth sub-pixels having a light emitting area and a non-light emitting area surrounding the light emitting area; first to fourth light emitting diodes on the substrate respectively in the first to fourth sub-pixels; and a transmittance adjustment layer receiving light emitted from the first to fourth light emitting diodes along a first direction and including a gray dye.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority to Korean Patent Application No. 10-2020-0095098, filed in Korea on July 30, 2020, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to an organic light-emitting diode (OLED) display device, and more specifically, to an OLED display device having relatively low reflectivity and relatively high brightness. Background Technology

[0004] Recently, with the advent of the information-oriented society and the increasing interest in information displays for processing and displaying large amounts of information, as well as the growing demand for portable information media, the display field has developed rapidly. Consequently, various thin and light flat panel display devices have been developed and have attracted attention.

[0005] Among various flat panel display devices, organic light-emitting diode (OLED) displays are light-emitting devices, which do not include the backlight unit used in non-light-emitting devices such as liquid crystal displays (LCDs). As a result, OLED displays are lightweight and thin.

[0006] Furthermore, compared to LCD devices, OLED displays offer advantages in viewing angle, contrast ratio, and power consumption. Additionally, OLED displays can be driven with lower DC voltages and have a faster response time. Moreover, because the internal components of OLED displays are solid-phase, they exhibit high durability against external shocks and a wider usable temperature range.

[0007] In OLED display devices, since the contrast is reduced due to the metal lines or electrodes, a circular polarizer is placed above the display panel to prevent the contrast from decreasing.

[0008] A circular polarizer comprises a delay layer and a linear polarization layer. The delay layer consists of a quarter-wave plate (QWP) with a delay value of λ / 4, while the linear polarization layer with a polarization axis causes the light to be linearly polarized along the polarization axis.

[0009] When a delay layer is placed on the display panel and a linear polarization layer is placed on the delay layer, external light passes through a circular polarizer and is reflected inside the display panel. Since the reflected light does not pass through the linear polarization layer, the reflectivity of external light is reduced.

[0010] However, when a circular polarizer is disposed on the display panel, the total luminance of the OLED display apparatus is also reduced. For example, since the transmittance of the circular polarizer is in the range of about 40% to about 50%, the luminance of light from the light emitting diode is reduced by more than about 50% through the circular polarizer. As a result, the OLED display apparatus has a limitation in luminance efficiency increase due to the circular polarizer having a transmittance of about 40% to about 50%.

[0011] According to a method of obtaining full color, the OLED display apparatus is classified into a red, green, and blue independent light emitting type; a white light emitting type using a red color filter, a green color filter, and a blue color filter; and a color conversion type. When white color is displayed by the white light emitting type using the red color filter, the green color filter, and the blue color filter, white color correction (WCT) is performed for ideal white light.

[0012] White color correction is determined using a white sub-pixel, a blue sub-pixel, and a green sub-pixel. Since the blue sub-pixel has a relatively low efficiency, the white color correction requires a relatively high power consumption.

[0013] In addition, due to the blue sub-pixel having a relatively high power consumption, the lifespan of the light emitting diode is reduced, and the efficiency of the OLED display apparatus is reduced. SUMMARY

[0014] Accordingly, the disclosure relates to an organic light emitting diode display apparatus that substantially eliminates one or more problems resulting from limitations and disadvantages of the related art.

[0015] An object of the disclosure is to provide an organic light emitting diode display apparatus having a relatively low reflectance and a relatively high luminance.

[0016] Another object of the disclosure is to provide an organic light emitting diode display apparatus having improved lifespan and efficiency and reduced power consumption.

[0017] Another object of the disclosure is to provide an organic light emitting diode display apparatus having maximized luminance and minimized external light reflectance.

[0018] Another object of the disclosure is to provide an organic light emitting diode display apparatus that expands product applications and satisfies customer needs.

[0019] Additional features and advantages of the disclosure will be set forth in the description that follows, and in part will be apparent from the description, or can be learned by practice of the disclosure. The 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.

[0020] To achieve these and other advantages and for the purposes of this disclosure, as specifically and broadly described herein, an organic light-emitting diode (OLED) display device is provided, comprising: a substrate including a first sub-pixel, a second sub-pixel, a third sub-pixel, and a fourth sub-pixel, each of the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel having a light-emitting region and a non-light-emitting region surrounding the light-emitting region; a first light-emitting diode, a second light-emitting diode, a third light-emitting diode, and a fourth light-emitting diode, respectively located in the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel on the substrate; and a transmittance adjustment layer receiving light emitted from the first light-emitting diode, the second light-emitting diode, the third light-emitting diode, and the fourth light-emitting diode along a first direction and comprising a gray dye.

[0021] It should 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 claimed contents of this disclosure. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of this disclosure and are incorporated in conjunction with this application as a part of it, illustrate embodiments of this disclosure and, together with the specification, serve to explain the principles of this disclosure. In the drawings:

[0023] Figure 1A and Figure 1B These are a plan view and an exploded perspective view showing an organic light-emitting diode display device according to a first embodiment of the present disclosure;

[0024] Figure 2 This is a graph showing the transmittance of an organic light-emitting diode display device according to the first embodiment of the present disclosure, relative to wavelength and the thickness of the transmittance adjustment layer.

[0025] Figure 3 It is along Figure 1A A cross-sectional view taken from line III-III';

[0026] Figure 4A and Figure 4B These are graphs showing the white correction of the organic light-emitting diode display device according to the comparative example and the first embodiment of the present disclosure;

[0027] Figure 5 This is a cross-sectional view showing an organic light-emitting diode display device according to a second embodiment of the present disclosure;

[0028] Figure 6is a cross-sectional view illustrating an organic light emitting diode display device according to a third embodiment of the disclosure;

[0029] Figure 7 is a cross-sectional view illustrating an organic light emitting diode display device according to a fourth embodiment of the disclosure. DETAILED DESCRIPTION

[0030] Advantages and features of the present disclosure and a method of achieving the same can be apparent from following exemplary embodiments described in detail with reference to the accompanying drawings. The present disclosure may, however, be embodied in different forms, not just the ones set forth in the present disclosure. Rather, the present disclosure is intended to cover all possible forms as fall within the scope of the appended claims, and their equivalents. In addition, the present disclosure is not limited to the examples described herein, but is applicable to all technologies within the scope of the appended claims.

[0031] The shapes, sizes, proportions, angles, and numbers disclosed in the accompanying drawings for describing the embodiments of the present disclosure are merely examples. Thus, the present disclosure is not limited to the illustrated details. Throughout the application, the same reference numerals refer to the same elements. In the following description of the embodiments, detailed descriptions of known functions or configurations incorporated herein can be omitted when it is determined that such a detailed description can unnecessarily obscure the point of the present disclosure. In the case where the terms "include", "have", and "comprise" are used in the present application, additional parts can be added unless a more restrictive term such as "only" is used. Unless otherwise mentioned, the singular form of a term can include the plural form.

[0032] In explaining an element, the element is also explained to include an error or a tolerance range, even if there is no explicit description of such an error or a tolerance range.

[0033] In describing a positional relationship, when a positional relationship between two parts is described as "on", "above", "below", or "next", for example, one or more other parts can be disposed between the two parts, unless a more restrictive term such as "only" or "directly" is used.

[0034] It will be understood that, although the terms "first", "second", etc. can 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.

[0035] As those skilled in the art can fully understand, the features of the embodiments of the present disclosure can be partially or wholly combined or combined with each other, and can be variously inter-operated and technically driven with each other. The embodiments of the present disclosure can be independently implemented from each other, or can be implemented together in a mutual dependency.

[0036] Hereinafter, a display device according to an embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. In the following description, like reference numerals in the drawings denote like elements throughout the specification. When it is determined that a detailed description of a well-known function or configuration related to the present disclosure unnecessarily obscures the gist of the inventive concept, a detailed description thereof will be omitted or a brief description thereof will be given.

[0037] Figure 1A and Figure 1B are a plan view and an exploded perspective view, respectively, showing an organic light emitting diode display device according to a first embodiment of the present disclosure, Figure 2 is a graph showing transmittance with respect to wavelength and thickness of a transmittance adjustment layer of the organic light emitting diode display device according to the first embodiment of the present disclosure.

[0038] In Figure 1A and Figure 1B , the organic light emitting diode display device 100 includes a plurality of pixels P, each of which includes a red sub-pixel R-SP, a green sub-pixel G-SP, and a blue sub-pixel B-SP. Each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP includes an emission area EA, and a bank 119( Figure 3 ) is provided at an edge portion of the emission area EA to constitute a non-emission area NEA. The non-emission area NEA can surround the emission area EA, and thus the non-emission area NEA includes an upper side portion, a right side portion, a lower side portion, and a left side portion.

[0039] The red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP can be alternately disposed in a horizontal direction, and each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP can be disposed on the same line in a vertical direction.

[0040] As a result, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP can be arranged to have a bar type.

[0041] Each of the plurality of pixels P further includes a white sub-pixel W-SP, and one pixel P including the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP has a rectangular shape.

[0042] Although the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP have the same width as each other in the first embodiment, the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP can have different widths from each other in other embodiments.

[0043] A switching thin film transistor (TFT) STr and a driving TFT DTr are provided in a non-emitting region NEA of each of the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP, and a light emitting diode (LED) E is provided in an emitting region EA of each of the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP. Figure 3 The light emitting diode (LED) E includes a first electrode 111 Figure 3 , a light emitting layer 113 Figure 3 , and a second electrode 115 Figure 3 .

[0044] The switching TFT STr and the driving TFT DTr are connected to each other, and the driving TFT DTr is connected to the LED E.

[0045] A gate line GL, a data line DL, and a power supply line VDD are provided on the substrate 101, thereby defining each of the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP.

[0046] The switching TFT STr is connected to the gate line GL and the data line DL that cross each other, to select each of the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP.

[0047] The switching TFT STr includes a switching gate electrode SG connected to the gate line GL, a switching semiconductor layer (not shown), a switching source electrode SS, and a switching drain electrode SD.

[0048] The driving TFT DTr drives the LED E of each of the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP selected by the switching TFT STr. The driving TFT DTr includes a driving gate electrode DG connected to the switching drain electrode SD of the switching TFT STr, a driving semiconductor layer 103 Figure 3 , a driving source electrode DS connected to the power supply line VDD, and a driving drain electrode DD.

[0049] A driving drain electrode DD of a driving TFT DTr is connected to the first electrode 111 of the LED E.

[0050] The light emitting layer 113 is disposed between the first electrode 111 and the second electrode 115 of the LED E.

[0051] In the OLED display device 100, the transmittance adjustment layer 200 including the gray dye is disposed corresponding to a transmission direction of light emitted from the light emitting layer 113.

[0052] The transmittance adjustment layer 200 includes a gray pattern 210 and a transparent pattern 220 corresponding to the light emitting region EA and the non-light emitting region NEA in each of the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP. The gray pattern 210 can be formed of a mixture of a transparent resin and a gray dye, and the transparent pattern 220 can be formed of a transparent resin.

[0053] The transparent resin can include an adhesive resin such as a polyester adhesive resin, an acrylic adhesive resin, a polyurethane adhesive resin, a melamine adhesive resin, a polyvinyl alcohol adhesive resin, and an oxazoline adhesive resin. For example, the transparent resin can include an acrylic adhesive resin.

[0054] The transmittance adjustment layer 200 can form to change the transmittance of the OLED display device 100, and the transmittance of the transmittance adjustment layer 200 can be determined according to the first thickness D1 and the second thickness D2 of the gray pattern 210. Figure 3 ) of the gray pattern 210.

[0055] In Figure 2 , the gray pattern 210 of the transmittance adjustment layer 200 can have various transmittances according to the first thickness D1 and the second thickness D2.

[0056] The transmittance of the OLED display device 100 can be proportional to the external light reflectance. For example, as the transmittance increases, the external light reflectance can increase, and as the transmittance decreases, the external light reflectance can decrease.

[0057] Since the OLED display device 100 has various transmittances by using the transmittance adjustment layer 200, the OLED display device 100 can have various external light reflectances.

[0058] As a result, the OLED display device 100 without the additional circular polarizer can have various external light reflectances similar to, greater than, or less than the external light reflectance of the OLED display device with the circular polarizer.

[0059] In the OLED display device 100, only the gray pattern 210 of the transmittance adjustment layer 200 is disposed corresponding to the non-emitting area NEA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP and the white sub-pixel W-SP, and the transparent pattern 220 and the gray pattern 210 are disposed corresponding to the emitting area EA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP; and the non-emitting area NEA between the emitting areas EA of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP, which overlap each other.

[0060] For example, only the gray pattern 210 can be disposed on the emitting area EA of the white sub-pixel W-SP; the upper and lower side portions of the non-emitting area NEA of the white sub-pixel W-SP; and the non-emitting area NEA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP. The transparent pattern 220 and the gray pattern 210, which overlap each other, can be disposed on the emitting area EA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP; and the left and right side portions of the non-emitting area NEA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP.

[0061] The transparent pattern 220 can be one monolithic single pattern covering the emitting area EA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP; and the non-emitting area NEA between the emitting areas EA of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP.

[0062] As a result, even in the OLED display device 100 without a circular polarizer, the external light reflectance can be minimized by adjusting the transmittance using the transmittance adjustment layer 200.

[0063] Specifically, the transparent pattern 220 and the gray pattern 210, which overlap each other, are disposed corresponding to the emitting area EA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP, so that the transmittance adjustment layer 200 has a relatively high transmittance in the emitting area EA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP. As a result, the reduction in brightness in the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP is prevented.

[0064] Since various luminance and various external light reflectance can be designed, the OLED display device 100 having optimal luminance and external light reflectance is provided, thereby expanding product applications and satisfying customer needs.

[0065] Further, since the circular polarizer, which is relatively high in cost, is omitted, material costs are reduced and manufacturing efficiency is improved.

[0066] Figure 3 is a cross-sectional view taken along Figure 1A line III-III' of FIG. 1.

[0067] In Figure 3 , the pixel P includes a white sub-pixel W-SP, a red sub-pixel R-SP, a green sub-pixel G-SP, and a blue sub-pixel B-SP. Each of the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP includes a light emitting area EA, and a bank 119 is provided at an edge portion of the light emitting area EA to constitute a non-light emitting area NEA.

[0068] The semiconductor layer 103 is provided in a switching region TrA of the non-light emitting area NEA of each of the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP on the substrate 101. The semiconductor layer 103 can be formed of silicon. For example, the semiconductor layer 103 can include an active region 103a of intrinsic silicon at a central portion thereof, and a source region 103b and a drain region 103c of impurity-doped silicon at both sides of the active region 103a.

[0069] The gate insulating layer 105 is provided on the semiconductor layer 103.

[0070] The drive gate electrode DG is provided on the gate insulating layer 105 and over the active region 103a of the semiconductor layer 103, and the gate line GL is provided on the gate insulating layer 105.

[0071] The first interlayer insulating layer 109a is provided on the drive gate electrode DG and the gate line GL. The first interlayer insulating layer 109a and the gate insulating layer 105 have a first semiconductor contact hole 116 and a second semiconductor contact hole 117 that respectively expose the source region 103b and the drain region 103c.

[0072] The drive source electrode DS and the drive drain electrode DD are provided on the first interlayer insulating layer 109a. The drive source electrode DS and the drive drain electrode DD are spaced apart from each other and connected to the source region 103b and the drain region 103c through the first semiconductor contact hole 116 and the second semiconductor contact hole 117, respectively.

[0073] A second interlayer insulating layer 109b is provided on the first interlayer insulating layer 109a exposed between the drive source electrode DS and the drive drain electrode DD.

[0074] The drive source electrode DS and the drive drain electrode DD, the semiconductor layer 103 including the source region 103b and the drain region 103c, the gate insulating layer 105 on the semiconductor layer 103, and the drive gate electrode DG constitute the drive TFT DTr.

[0075] The switch TFT STr has the same structure as the drive TFT DTr and is connected to the drive TFT DTr.

[0076] Although the drive TFT DTr has a top gate type in which the semiconductor layer 103 includes polycrystal silicon or an oxide semiconductor in the first embodiment, the drive TFT DTr can have a bottom gate type in which the semiconductor layer includes intrinsic amorphous silicon and doped amorphous silicon in another embodiment.

[0077] When the semiconductor layer 103 is formed of an oxide semiconductor, a light shielding layer can be provided below the semiconductor layer 103, and a buffer layer can be provided between the light shielding layer and the semiconductor layer 103.

[0078] The second interlayer insulating layer 109b has a drain contact hole PH that exposes the drive drain electrode DD of the drive TFT DTr.

[0079] A first electrode 111 is provided on the second interlayer insulating layer 109b, and the first electrode 111 is connected to the drive drain electrode DD of the drive TFT DTr through the drain contact hole PH. For example, the first electrode 111 can include a material having a relatively high work function to serve as an anode.

[0080] The first electrode 111 is provided in each of the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP, and a bank 119 is provided between the first electrode 111 in adjacent sub-pixels. In a case where the bank 119 serves as a boundary of each sub-pixel, the first electrode 111 is divided into each of the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP.

[0081] A light emitting layer 113 is provided on the first electrode 111 inside the bank 119. The light emitting layer 113 can have a single layer or include a hole injection layer, a hole transport layer, a light emitting material layer, an electron transport layer, and an electron injection layer.

[0082] The light-emitting layer 113 of each of the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP can emit white light.

[0083] The second electrode 115 is provided on the light-emitting layer 113. For example, the second electrode 115 can include a material having a relatively low work function to function as a cathode.

[0084] When a voltage is applied to the first electrode 111 and the second electrode 115 according to a selected signal, holes injected from the first electrode 111 and electrons injected from the second electrode 115 are transported into the light-emitting layer 113 to form an exciton. When the exciton transitions from an excited state to a ground state, light is generated in the light-emitting layer 113, thereby being emitted as a visible light ray.

[0085] The OLED display device 100 has a top emission type in which white light of the light-emitting layer 113 is emitted to the outside via the second electrode 115. As a result, the OLED display device 100 displays an image.

[0086] Since the switching TFT STr and the driving TFT DTr are disposed under the bank 119 and the first electrode 111 in the top emission type, the top emission type has a wider design area than the bottom emission type.

[0087] For example, the first electrode 111 of the anode can be formed of a metal material having a relatively high reflectance and can have a single layer of aluminum (Al) or a double layer of aluminum (Al) and indium tin oxide (ITO). The second electrode 115 of the cathode can be formed of a transparent conductive material such as indium tin oxide (ITO) and indium zinc oxide (IZO) or a semi-transmissive metal material such as magnesium (Mg), silver (Ag), and an alloy thereof, thereby transmitting light of the light-emitting layer 113.

[0088] The passivation layer 102 and the encapsulation substrate 104 are sequentially disposed over the switching TFT STr, the driving TFT DTr, and the LED E. The thin film passivation layer 102 prevents moisture from penetrating into the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP to protect the light-emitting layer 113 from moisture or oxygen.

[0089] The passivation layer 102 protects the switching TFT STr, the driving TFT DTr, and the LED E from external impact and attaches the substrate 101 and the encapsulation substrate 104.

[0090] As a result, the OLED display device 100 is encapsulated.

[0091] A color conversion layer 106 is provided on an inner surface of the encapsulation substrate 104. The color conversion layer 106 includes a white color filter pattern W-CF, a red color filter pattern R-CF, a green color filter pattern G-CF, and a blue color filter pattern B-CF corresponding to the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP, respectively. The color conversion layer 106 converts the white light of the light-emitting layer 113, and the white color filter pattern W-CF, the red color filter pattern R-CF, the green color filter pattern G-CF, and the blue color filter pattern B-CF correspond to the light-emitting areas EA of the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP, respectively.

[0092] Accordingly, the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP emit white light, red light, green light, and blue light, respectively, and the OLED display device 100 displays a full-color image with high brightness.

[0093] The white color filter pattern W-CF can be omitted in the light-emitting area EA of the white sub-pixel W-SP, and the white light of the light-emitting layer 113 can pass through the color conversion layer 106 as is.

[0094] A transmittance adjustment layer 200 is further provided on an outer surface of the encapsulation substrate 104.

[0095] The transmittance of light emitted from the OLED display device 100 can be controlled by adjusting the first thickness D1 and the second thickness D2 of the gray pattern 210 of the transmittance adjustment layer 200. For example, the gray pattern 210 can have different thicknesses in the light-emitting areas EA and the non-light-emitting areas NEA of the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP. As a result, the brightness reduction of the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP is minimized, and the external light reflectance is reduced to have a value less than a reference.

[0096] Table 1 shows experimental results of measuring the external light reflectance of the non-light-emitting areas and the light-emitting areas of the sub-pixels of the organic light-emitting diode display device according to the comparative example.

[0097] [Table 1]

[0098] External light reflectance NEA (electrode portion) 9.74％ EA of R-SP 0.86％ EA of G-SP 2.36％ EA of B-SP 0.06％ EA of W-SP 6.22％ Total 19.24％

[0099] In Table 1, the external light reflectance of the non-light-emitting areas (electrode portions) NEA and the light-emitting areas EA of the white sub-pixels is higher than that of the light-emitting areas EA of the red sub-pixels, the green sub-pixels, and the blue sub-pixels.

[0100] As a result, the external light reflectance of the light emitting regions EA of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP slightly affects the external light reflectance of the OLED display device, and the external light reflectance of the non-light emitting region NEA and the light emitting region EA of the white sub-pixel W-SP corresponding to the electrode portion significantly affects the external light reflectance of the OLED display device.

[0101] In the OLED display device 100 according to the first embodiment of the disclosure, the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the non-light emitting region NEA and the light emitting region EA of the white sub-pixel W-SP is formed to have a first thickness D1. As a result, the transmittance of the transmittance adjustment layer 200 is significantly reduced in the non-light emitting region NEA and the light emitting region EA of the white sub-pixel W-SP, and the external light reflectance of the non-light emitting region NEA and the light emitting region EA of the white sub-pixel W-SP is significantly reduced.

[0102] Therefore, the total external light reflectance of the OLED display device 100 is reduced due to the gray pattern 210 of the first thickness D1.

[0103] The gray pattern 210 of the transmittance adjustment layer 200 corresponding to the light emitting region EA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP is formed to have a second thickness D2 smaller than the first thickness D1. As a result, the transmittance of the transmittance adjustment layer 200 is slightly reduced in the light emitting region EA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP, and the external light reflectance of the light emitting region EA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP is slightly reduced.

[0104] Since the luminance of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP is not significantly reduced, the luminance reduction of the OLED display device 100 is prevented.

[0105] The total transmittance of the gray pattern 210 of the transmittance adjustment layer 200 can be obtained from the unit transmittance and the thickness according to Equation 1 below.

[0106] [Equation 1]

[0107] Total transmittance = Unit transmittance * Thickness

[0108] Various total transmittances are obtained by changing the first thickness D1 and the second thickness D2 of the gray pattern 210 of the transmittance adjustment layer 200.

[0109] In Table 1, when the external light reflectance of the non-light emitting region NEA is about 9.74%, the total transmittance of the gray pattern 210 of the transmittance adjustment layer 200 can be based on "9.74% * A" in the case of the first thickness D1, and "9.74% * B" in the case of the second thickness D2.2 The first thickness D1 of the gray pattern 210 of the transmittance adjustment layer 200 is determined in the non-emitting area NEA, where A is the transmittance of the gray pattern 210 of the transmittance adjustment layer 200. For example, when the gray pattern 210 is formed to have a thickness corresponding to a transmittance of about 50%, the reflectance in the non-emitting area NEA can be designed to be about 2.43%.

[0110] The first thickness D1 and the second thickness D2 of the gray pattern 210 of the transmittance adjustment layer 200 can be determined according to Equation 1, such that the non-emitting area NEA and the emitting area EA of the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP have a target transmittance.

[0111] For example, the gray pattern 210 of the transmittance adjustment layer 200 having the first thickness D1 can be formed to have a transmittance of about 50%, and the gray pattern 210 of the transmittance adjustment layer 200 having the second thickness D2 can be formed to have a transmittance of about 70%.

[0112] Therefore, in the OLED display device 100 according to the first embodiment of the disclosure, the external light reflectance is minimized, and the luminance reduction of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP is prevented.

[0113] In addition, the luminance is increased. In addition, since the circular polarizer, which is relatively high in cost, is omitted, the material cost is reduced and the manufacturing efficiency is improved.

[0114] Specifically, even when no additional white color correction (WCT) is performed, a desired white light can be obtained. As a result, the power consumption increase in the blue sub-pixel B-SP and the LED E life reduction in the blue sub-pixel B-SP are prevented.

[0115] Since the transmittance adjustment layer 200 including the gray dye is disposed in correspondence with the transmission direction of the light emitted from the emitting layer 113, the external light reflectance is minimized and the luminance is increased. As a result, even when no additional white color correction (WCT) is performed, a desired white light can be obtained.

[0116] The chromaticity or the reference white of a light source can be expressed as a temperature in the radiation curve that is closest to the area, rather than a coordinate in a two-dimensional color space. The temperature can be referred to as a correlated color temperature (CCT) or a color temperature. The color temperature can be used as a value indicating how close a white color is to a color. For example, a CCT of about 10000 K is required.

[0117] Figure 4A and Figure 4B are graphs showing white color correction of organic light emitting diode display devices according to a comparative example and the first embodiment of the disclosure, respectively.

[0118] In Figure 4A the OLED display device according to the comparative example including the circular polarizer has a relatively low luminance, a CCT of about 6500 K is obtained via WCT by using the white sub-pixel W-SP, the blue sub-pixel B-SP, and the green sub-pixel G-SP.

[0119] For example, in the OLED display device according to the comparative example including the circular polarizer, a white having a CCT of about 6500 K is obtained by simultaneously driving the white sub-pixel W-SP, the blue sub-pixel B-SP, and the green sub-pixel G-SP.

[0120] Since the blue sub-pixel B-SP has a lower efficiency compared to the white sub-pixel W-SP and the green sub-pixel G-SP, a higher power consumption is required for WCT. As a result, the lifespan of the LED of the blue sub-pixel B-SP is shortened, and the efficiency of the OLED display device is reduced.

[0121] In Figure 4B the OLED display device 100 according to the first embodiment of the disclosure, since the gray pattern 210 having the first thickness D1 is provided corresponding to the white sub-pixel W-SP, even when the transmittance of the white sub-pixel W-SP is reduced to about 50%, the luminance of the white sub-pixel W-SP is increased compared to the OLED display device including the circular polarizer.

[0122] As a result, a white having a CCT of about 10000 K is obtained by driving the white sub-pixel W-SP.

[0123] Table 2 shows experimental results of the unit transmittance, the color coordinates, the external light reflectance, and the total transmittance of the transmittance adjustment layer 200 of the organic light emitting diode display device according to the comparative example and the first embodiment of the disclosure.

[0124] [Table 2]

[0125]

[0126] In Table 2, Sample 1 indicates the OLED display device according to the comparative example including the circular polarizer, and Sample 2 indicates the OLED display device according to the first embodiment of the disclosure, in which the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the non-emitting area NEA and the emitting area EA of the white sub-pixel W-SP has a transmittance of about 90%.

[0127] Sample 3 represents an OLED display device according to the first embodiment of the present disclosure in which the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the non-emitting area NEA and the emitting area EA of the white sub-pixel W-SP has a transmittance of about 80%, and sample 4 represents an OLED display device according to the first embodiment of the present disclosure in which the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the non-emitting area NEA and the emitting area EA of the white sub-pixel W-SP has a transmittance of about 70%. Sample 5 represents an OLED display device according to the first embodiment of the present disclosure in which the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the non-emitting area NEA and the emitting area EA of the white sub-pixel W-SP has a transmittance of about 60%, and sample 6 represents an OLED display device according to the first embodiment of the present disclosure in which the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the non-emitting area NEA and the emitting area EA of the white sub-pixel W-SP has a transmittance of about 50%.

[0128] In samples 2, 3, 4, 5, and 6, the gray pattern 210 corresponding to the emitting areas EA of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP has a transmittance of about 70%.

[0129] For a CCT of about 10000 K, white coordinates of (0.281, 0.288) are required. Since the OLED display device including the circular polarizer has white coordinates of (0.309, 0.328), the CCT of about 10000 K is not obtained in sample 1 of the OLED display device including the circular polarizer.

[0130] Although the white coordinates (0.281, 0.288) corresponding to the CCT of about 10000 K are not obtained in samples 2, 3, 4, 5 of the OLED display device, the white coordinates (0.284, 0.290) are obtained in sample 6 of the OLED display device including the gray pattern 210 of the transmittance adjustment layer 200 having a transmittance of about 50%. The white coordinates of sample 6 are very close to the white coordinates corresponding to the CCT of about 10000 K.

[0131] Specifically, sample 6 has an external light reflectance similar to that of sample 1 of the OLED display device including the circular polarizer, and sample 6 has a total transmittance about 15% higher than that of sample 1 of the OLED display device including the circular polarizer.

[0132] In the OLED display device 100 according to the first embodiment of the present disclosure, the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the non-emitting area NEA and the emitting area EA of the white sub-pixel W-SP has a transmittance of about 50%, and the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the emitting area EA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP has a transmittance of about 70%. As a result, even without an additional circular polarizer, the external light reflectance is minimized, and the luminance reduction of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP is prevented.

[0133] Further, since the luminance of the OLED display device 100 is increased, even when the additional WCT is not performed, the desired white light can be obtained.

[0134] Therefore, the power consumption increase of the blue sub-pixel B-SP and the lifespan reduction of the LED in the blue sub-pixel B-SP are prevented.

[0135] In the OLED display device 100 according to the first embodiment of the present disclosure, the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the non-emitting area NEA and the emitting area EA of the white sub-pixel W-SP has a first thickness D1, and the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the emitting area EA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP and the non-emitting area NEA between the emitting areas EA of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP has a second thickness D2 smaller than the first thickness D1, so that the gray pattern 210 corresponding to the non-emitting area NEA and the emitting area EA of the white sub-pixel W-SP has a transmittance of about 50%, and the gray pattern 210 corresponding to the emitting area EA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP has a transmittance of about 70%. As a result, the gray pattern 210 of the transmittance adjustment layer 200 has a step difference.

[0136] To compensate for the step difference of the gray pattern 210, a transparent pattern 220 overlapping the gray pattern 210 having the second thickness D2 can be disposed above or below the gray pattern 210 having the second thickness D2.

[0137] The transmittance adjustment layer 200 including the transparent pattern 220 can have a refractive index equal to or similar to that of the encapsulation substrate 104. As a result, when light of the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP passes through the encapsulation substrate 104 and enters the transmittance adjustment layer 200, refraction and loss of light at the interface between the encapsulation substrate 104 and the transmittance adjustment layer 200 are prevented, and an increase in external light reflectance is prevented.

[0138] Figure 5 is a cross-sectional view illustrating an organic light emitting diode display apparatus according to a second embodiment of the disclosure. The OLED display apparatus according to the second embodiment has a bottom emission type.

[0139] In Figure 5 , a driving thin film transistor (TFT) DTr including a semiconductor layer 103, a gate insulating layer 105, a driving gate electrode DG, a driving source electrode DS, and a driving drain electrode DD is disposed in a switching region TrA of a non-emission region NEA on the substrate 101. A white color filter pattern W-CF, a red color filter pattern R-CF, a green color filter pattern G-CF, and a blue color filter pattern B-CF are disposed in an emission region EA of a white sub-pixel W-SP, a red sub-pixel R-SP, a green sub-pixel G-SP, and a blue sub-pixel B-SP, respectively, on a first interlayer insulating layer 109a.

[0140] A second interlayer insulating layer 109b is disposed on the white color filter pattern W-CF, the red color filter pattern R-CF, the green color filter pattern G-CF, and the blue color filter pattern B-CF, and a first electrode 111 is disposed on the second interlayer insulating layer 109b. The first electrode 111 is connected to the driving drain electrode DD through a drain contact hole PH in the gate insulating layer 105 and the first interlayer insulating layer 109a.

[0141] The first electrode 111 is disposed in each of the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP, and a bank 119 is disposed between the first electrodes 111 of adjacent sub-pixels.

[0142] A light emitting layer 113 is disposed on the first electrode 111 inside the bank 119, and a second electrode 115 is disposed on the light emitting layer 113. The first electrode 111 and the second electrode 115 can be an anode and a cathode, respectively, and the first electrode 111, the light emitting layer 113, and the second electrode 115 can constitute a light emitting diode (LED) E.

[0143] A passivation layer 102 and an encapsulation substrate 104 of a thin film are sequentially disposed above the driving TFT DTr and the LED E, so that the OLED display apparatus 100 is encapsulated.

[0144] In the bottom emission type OLED display device 100 according to the second embodiment of the present disclosure, white light emitted from the light emitting layer 113 passes through the first electrode 111 and the white color filter pattern W-CF, the red color filter pattern R-CF, the green color filter pattern G-CF, and the blue color filter pattern B-CF to display an image.

[0145] The transmittance adjustment layer 200 including a gray dye is provided corresponding to the transmission direction of light emitted from the light emitting layer 113. In the OLED display device 100, only the gray pattern 210 of the transmittance adjustment layer 200 is provided corresponding to the non-emitting area NEA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP and the white sub-pixel W-SP, and the gray pattern 210 and the transparent pattern 220 are provided overlapping each other corresponding to the emitting area EA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP and the non-emitting area NEA between the emitting areas EA of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP.

[0146] In the OLED display device 100 according to the second embodiment of the present disclosure, the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the non-emitting area NEA and the emitting area EA of the white sub-pixel W-SP has a transmittance of about 50%, and the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the emitting area EA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP has a transmittance of about 70%. As a result, even without an additional circular polarizer, the external light reflectance is minimized, and the reduction in brightness of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP is prevented.

[0147] Further, since the brightness of the OLED display device 100 is increased, a desired white light can be obtained even when an additional WCT is not performed.

[0148] Therefore, the increase in power consumption of the blue sub-pixel B-SP and the reduction in the lifespan of the LED in the blue sub-pixel B-SP are prevented.

[0149] Figure 6 is a cross-sectional view illustrating an organic light emitting diode display device according to a third embodiment of the present disclosure.

[0150] In Figure 6In the non-emission region NEA on the substrate 101, a drive thin film transistor (TFT) DTr including the semiconductor layer 103, the gate insulating layer 105, the drive gate electrode DG, the drive source electrode DS, and the drive drain electrode DD is provided in a switching region TrA. The first electrode 111 is provided in the emission region EA on the second interlayer insulating layer 109b. The first electrode 111 is connected to the drive drain electrode DD through a drain contact hole PH in the gate insulating layer 105 and the first interlayer insulating layer 109a.

[0151] The first electrode 111 is provided in each of the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP, and the bank 119 is provided between the first electrodes 111 of adjacent sub-pixels.

[0152] The white light-emitting layer 113a, the red light-emitting layer 113b, the green light-emitting layer 113c, and the blue light-emitting layer 113d are provided on the first electrode 111 inside the bank 119 in the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP, respectively. The white light-emitting layer 113a, the red light-emitting layer 113b, the green light-emitting layer 113c, and the blue light-emitting layer 113d emit white light, red light, green light, and blue light, respectively. The first electrode 111 and the second electrode 115 can be an anode and a cathode, respectively, and the first electrode 111; each of the white light-emitting layer 113a, the red light-emitting layer 113b, the green light-emitting layer 113c, and the blue light-emitting layer 113d; and the second electrode 115 can constitute a light-emitting diode (LED) E.

[0153] The passivation layer 102 and the sealing substrate 104 of thin films are sequentially provided above the drive TFT DTr and the LED E, so that the OLED display device 100 is sealed.

[0154] The transmittance adjustment layer 200 is provided corresponding to the transmission direction of light emitted from the white light-emitting layer 113a, the red light-emitting layer 113b, the green light-emitting layer 113c, and the blue light-emitting layer 113d. In the OLED display device 100, only the gray pattern 210 of the transmittance adjustment layer 200 is provided corresponding to the non-emission region NEA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP and the white sub-pixel W-SP, and the gray pattern 210 and the transparent pattern 220 that overlap each other are provided corresponding to the emission region EA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP; and the non-emission region NEA between the emission regions EA of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP.

[0155] Specifically, the brightness enhancement film 230 can be provided on the transmittance adjustment layer 200.

[0156] As a result, the OLED display device 100 according to the third embodiment of the disclosure has the same external light reflectance as that of the OLED display device having the circular polarizer, and has a brightness which is about 30% higher than that of the OLED display device having the circular polarizer.

[0157] Table 3 shows experimental results of the transmittance, color coordinates, brightness, and external light reflectance of the organic light emitting diode display devices according to the comparative example and the third embodiment of the disclosure.

[0158] [Table 3]

[0159]

[0160] In Table 3, Sample A indicates the OLED display device including the brightness enhancement film according to the comparative example. Sample A does not satisfy the white color coordinates (0.281, 0.288) corresponding to the CCT of 10000K.

[0161] Sample B indicates the OLED display device 100 according to the third embodiment of the disclosure, in which the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the non-emitting area NEA and the emitting area EA of the white sub-pixel W-SP has a transmittance of about 50%, and the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the emitting area EA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP has a transmittance of about 70%. In the OLED display device 100 of Sample B, the brightness enhancement film is further provided on the transmittance adjustment layer. As a result, an external light reflectance of about 4.0% and white color coordinates (0.282, 0.288) corresponding to the CCT of 10000K are obtained.

[0162] Specifically, when the full white brightness of the OLED display device of Sample A is about 100%, the full white brightness of the OLED display device 100 of Sample B is about 135%. As a result, the full white brightness is increased by about 35%, and the red, green, and blue brightnesses are increased by about 38%.

[0163] In the OLED display device 100 according to the third embodiment of the present disclosure, the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the non-emitting area NEA and the emitting area EA of the white sub-pixel W-SP has a transmittance of about 50%, and the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the emitting areas EA of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP has a transmittance of about 70%. As a result, even without an additional circular polarizer, the external light reflectance is minimized, and the luminance reduction of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP is prevented.

[0164] Further, since the luminance of the OLED display device 100 is increased, even when the additional WCT is not performed, a desired white light can be obtained.

[0165] Specifically, since various luminances and various external light reflectances can be designed, the OLED display device 100 having optimal luminance and external light reflectance is provided, thereby expanding product applications and satisfying customer needs. Further, since the circular polarizer, which is relatively high in cost, is omitted, the material cost is reduced and the manufacturing efficiency is improved.

[0166] Figure 7 is a cross-sectional view illustrating an organic light emitting diode display device according to a fourth embodiment of the present disclosure.

[0167] In Figure 7 In the switch region TrA of the non-emitting area NEA on the substrate 101, a driving thin film transistor (TFT) DTr including a semiconductor layer 103, a gate insulating layer 105, a driving gate electrode DG, a driving source electrode DS, and a driving drain electrode DD is disposed. In the emitting area EA on the second interlayer insulating layer 109b, a first electrode 111 is disposed. The first electrode 111 is connected to the driving drain electrode DD through a drain contact hole PH in the gate insulating layer 105 and the first interlayer insulating layer 109a.

[0168] The first electrode 111 is disposed in each of the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP, and the bank 119 is disposed between the first electrodes 111 of adjacent sub-pixels.

[0169] The light-emitting layer 113 is provided on the first electrode 111 inside the bank portion 119 in each of the white sub-pixel W-SP, the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP, and the second electrode 115 is provided on the light-emitting layer 113. The light-emitting layer 113 emits white light. The first electrode 111 and the second electrode 115 can be an anode and a cathode, respectively, and the first electrode 111, the light-emitting layer 113, and the second electrode 115 can constitute a light-emitting diode (LED) E.

[0170] The thin-film passivation layer 102 and the color conversion layer 106 are sequentially provided over the drive TFT DTr and the LED E.

[0171] The color conversion layer 106 includes a red color filter pattern R-CF, a green color filter pattern G-CF, and a blue color filter pattern B-CF corresponding to the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP, respectively. The red color filter pattern R-CF, the green color filter pattern G-CF, and the blue color filter pattern B-CF are provided corresponding to the light-emitting region EA of the red sub-pixel R-SP, the light-emitting region EA of the green sub-pixel G-SP, and the light-emitting region EA of the blue sub-pixel B-SP, respectively.

[0172] The transmittance adjustment layer 200 is provided to cover the red color filter pattern R-CF, the green color filter pattern G-CF, and the blue color filter pattern B-CF of the color conversion layer 106. The transmittance adjustment layer 200 completely covers the red color filter pattern R-CF, the green color filter pattern G-CF, and the blue color filter pattern B-CF in the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP, and the transmittance adjustment layer 200 is provided on the passivation layer 102 to wrap the upper surface and the side surface of the red color filter pattern R-CF, the green color filter pattern G-CF, and the blue color filter pattern B-CF.

[0173] As a result, the transmittance adjustment layer 200 corresponding to the non-light-emitting region NEA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP and the white sub-pixel W-SP has a first thickness D1, and the transmittance adjustment layer 200 corresponding to the light-emitting region EA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP has a second thickness D2 smaller than the first thickness D1.

[0174] Since the first thickness D1 corresponds to the sum of the thickness of each of the red color filter pattern R-CF, the green color filter pattern G-CF, and the blue color filter pattern B-CF and the second thickness D2, the transmittance adjustment layer 200 covering the red color filter pattern R-CF, the green color filter pattern G-CF, and the blue color filter pattern B-CF has a flat upper surface.

[0175] The transmittance adjustment layer 200 can be formed of a mixture of a transparent resin and a gray dye. The transparent resin can include an acrylic resin or an epoxy resin having excellent insulating properties and not reacting with external materials. For example, the transparent resin can include an optical acrylic (PAC).

[0176] The transmittance adjustment layer 200 including the optical acrylic can degas the red color filter pattern R-CF, the green color filter pattern G-CF, and the blue color filter pattern B-CF and can block moisture. In addition, the transmittance adjustment layer 200 including the optical acrylic can compensate for a step difference of the red color filter pattern R-CF, the green color filter pattern G-CF, and the blue color filter pattern B-CF, thereby planarizing a surface of the OLED display device 100.

[0177] Specifically, since the transmittance adjustment layer 200 includes the gray dye, the OLED display device 100 has various transmittances. Since the transmittance adjustment layer 200 corresponding to the non-emitting area NEA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP and the white sub-pixel W-SP has the first thickness D1, and the transmittance adjustment layer 200 corresponding to the emitting area EA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP has the second thickness D2, the OLED display device 100 corresponding to the non-emitting area NEA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP and the white sub-pixel W-SP has a relatively low transmittance, and the OLED display device 100 corresponding to the emitting area EA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP has a relatively high transmittance.

[0178] In the OLED display device 100 according to the fourth embodiment of the disclosure, the transmittance adjustment layer 200 corresponding to the non-emitting area NEA and the emitting area EA of the white sub-pixel W-SP has a transmittance of about 50%, and the transmittance adjustment layer 200 corresponding to the emitting area EA of each of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP has a transmittance of about 70%. As a result, the external light reflectance is minimized to about 6%, and a CCT of about 10000 K is obtained.

[0179] Accordingly, since the external light reflectance is minimized and the luminance of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP is increased, the OLED display device having a relatively low reflectance and a relatively high luminance is provided.

[0180] The lifespan and efficiency are improved and the power consumption is reduced.

[0181] Further, since various luminance and various external light reflectance can be designed, the OLED display device 100 having optimal luminance and external light reflectance is provided, thereby expanding product applications and satisfying customer demands. Further, since the circular polarizer, which is relatively high in cost, is omitted, material costs are reduced and manufacturing efficiency is improved.

[0182] In particular, since the additional planarization process and the encapsulation substrate are omitted in the OLED display device 100 including the red color filter pattern R-CF, the green color filter pattern G-CF, and the blue color filter pattern B-CF, manufacturing efficiency is further improved.

[0183] It will be apparent to those skilled in the art that various modifications and variations 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.

Claims

1.An organic light emitting diode display apparatus, comprising: a substrate including a first sub-pixel, a second sub-pixel, a third sub-pixel, and a fourth sub-pixel, each of the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel having a light emitting area and a non-light emitting area surrounding the light emitting area; a first light emitting diode, a second light emitting diode, a third light emitting diode, and a fourth light emitting diode on the substrate in the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel, respectively; and a transmittance adjustment layer receiving light emitted from the first light emitting diode, the second light emitting diode, the third light emitting diode, and the fourth light emitting diode along a first direction and including a gray dye, wherein the transmittance adjustment layer corresponding to the first sub-pixel includes a gray pattern having a first thickness, and the transmittance adjustment layer corresponding to the second sub-pixel, the third sub-pixel, and the fourth sub-pixel includes a transparent pattern and a gray pattern having a second thickness smaller than the first thickness. 2.The organic light emitting diode display apparatus of claim 1, wherein the first sub-pixel includes a white sub-pixel. 3.The organic light emitting diode display apparatus of claim 2, wherein the gray pattern includes the gray dye, and wherein a gray pattern corresponding to the non-light emitting area of the second sub-pixel, the third sub-pixel, and the fourth sub-pixel and the first sub-pixel has a first transmittance, and a gray pattern corresponding to the light emitting area of the second sub-pixel, the third sub-pixel, and the fourth sub-pixel has a second transmittance higher than the first transmittance. 4.The organic light emitting diode display apparatus of claim 3, wherein a gray pattern corresponding to the non-light emitting area between the light emitting area of the second sub-pixel, the third sub-pixel, and the fourth sub-pixel has the second transmittance. 5.The organic light emitting diode display apparatus of claim 3, wherein a gray pattern having the first transmittance has the first thickness, and a gray pattern having the second transmittance has the second thickness. 6.The organic light emitting diode display apparatus of claim 5, wherein a gray pattern having the second transmittance overlaps the transparent pattern. 7.The organic light emitting diode display apparatus of claim 3, wherein the first transmittance is 50%, and the second transmittance is 70%. 8.The organic light emitting diode display apparatus of claim 3, further comprising a brightness enhancement film over the transmittance adjustment layer. 9.The organic light emitting diode display apparatus of claim 8, wherein the first light emitting diode, the second light emitting diode, the third light emitting diode, and the fourth light emitting diode emit white light, red light, green light, and blue light, respectively. 10.The organic light emitting diode display apparatus of claim 3, wherein the first, second, third, and fourth light emitting diodes emit white light, and wherein a red color filter pattern is disposed between the transmittance adjustment layer and the second light emitting diode in the light emitting area of the second sub-pixel, a green color filter pattern is disposed between the transmittance adjustment layer and the third light emitting diode in the light emitting area of the third sub-pixel, and a blue color filter pattern is disposed between the transmittance adjustment layer and the fourth light emitting diode in the light emitting area of the fourth sub-pixel. 11.The organic light emitting diode display apparatus of claim 10, wherein a white color filter pattern is disposed between the transmittance adjustment layer and the first light emitting diode in the light emitting area of the first sub-pixel. 12.The organic light emitting diode display apparatus of claim 10, wherein the transmittance adjustment layer comprises a mixture of an optical acrylic acid and the gray dye. 13.The organic light emitting diode display apparatus of claim 6, wherein an encapsulation substrate is disposed between the first, second, third, and fourth light emitting diodes and the transmittance adjustment layer, and wherein the encapsulation substrate has the same refractive index as the transparent pattern. 14.The organic light emitting diode display apparatus of claim 1, wherein the first, second, third, and fourth light emitting diodes are disposed on a first surface of the substrate, and the transmittance adjustment layer is disposed on a second surface of the substrate. 15.The organic light emitting diode display apparatus of claim 1, wherein the transparent patterns of the second, third, and fourth sub-pixels are integral. 16.An organic light emitting diode display apparatus comprising: a substrate comprising a first sub-pixel, a second sub-pixel, a third sub-pixel, and a fourth sub-pixel, each of the first, second, third, and fourth sub-pixels having a light emitting area and a non-light emitting area surrounding the light emitting area; first, second, third, and fourth light emitting diodes on the substrate in the first, second, third, and fourth sub-pixels, respectively; and a transmittance adjustment layer receiving light emitted from the first, second, third, and fourth light emitting diodes along a first direction and comprising a gray dye, wherein the first, second, third, and fourth light emitting diodes emit white light, wherein a red color filter pattern is provided between the transmittance adjustment layer and the second light emitting diode in the light emitting region of the second sub-pixel, a green color filter pattern is provided between the transmittance adjustment layer and the third light emitting diode in the light emitting region of the third sub-pixel, and a blue color filter pattern is provided between the transmittance adjustment layer and the fourth light emitting diode in the light emitting region of the fourth sub-pixel, and wherein the transmittance adjustment layer covers the red color filter pattern, the green color filter pattern, and the blue color filter pattern, and wraps upper surfaces and side surfaces of the red color filter pattern, the green color filter pattern, and the blue color filter pattern. 17.The organic light emitting diode display device of claim 16, wherein a white color filter pattern is provided between the transmittance adjustment layer and the first light emitting diode in the light emitting region of the first sub-pixel.

Images