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 an emission area and a non-emission area surrounding the emission area; first to fourth light emitting diodes in the first to fourth sub-pixels, respectively, on the substrate; and a transmittance adjustment layer receiving light emitted from the first to fourth light emitting diodes along the first direction and including a gray dye.

Description

[0001] This application is a divisional application of the invention patent application filed on May 27, 2021, with application number 202110586561.4 and title "Organic Light Emitting Diode Display Device".

[0002] Cross-references to related applications

[0003] 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

[0004] 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

[0005] 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.

[0006] 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.

[0007] 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 direct current (DC) voltages and have a fast response time. Moreover, because the internal components of OLED displays are solid-phase, they exhibit high durability against external shocks and a wide usable temperature range.

[0008] 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.

[0009] 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 linearly polarizes the light along the polarization axis.

[0010] 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.

[0011] However, when a circular polarizer is placed on the display panel, the overall brightness of the OLED display device also decreases. For example, since the transmittance of the circular polarizer is in the range of about 40% to about 50%, the brightness of light from the light-emitting diode is reduced by more than 50% after passing through the circular polarizer. As a result, due to the circular polarizer having a transmittance of about 40% to about 50%, the OLED display device is limited in terms of increasing brightness efficiency.

[0012] Based on the method of obtaining full color, OLED display devices are classified into three types: red, green, and blue independent emission types; white emission types using red, green, and blue color filters; and color conversion types. When displaying white using a white emission type with red, green, and blue color filters, white color transfer (WCT) is performed to achieve ideal white light.

[0013] White correction is determined using white, blue, and green subpixels. Because blue subpixels are relatively inefficient, white correction requires relatively high power consumption.

[0014] Furthermore, the lifespan of the light-emitting diodes is reduced due to the relatively high power consumption of the blue sub-pixels, and the efficiency of the OLED display device is also reduced. Summary of the Invention

[0015] Therefore, this disclosure relates to an organic light-emitting diode display device that substantially eliminates one or more problems caused by the limitations and disadvantages of related technologies.

[0016] One object of this disclosure is to provide an organic light-emitting diode display device having relatively low reflectivity and relatively high brightness.

[0017] Another objective of this disclosure is to provide an organic light-emitting diode display device with improved lifespan and efficiency and reduced power consumption.

[0018] Another object of this disclosure is to provide an organic light-emitting diode display device with maximized brightness and minimized external light reflectivity.

[0019] Another objective of this disclosure is to provide an organic light-emitting diode display device that expands product applications and meets customer needs.

[0020] Additional features and advantages of this disclosure will be set forth in the following description, some of which will be apparent from the description or may be understood by practice of this disclosure. These and other advantages of this disclosure can be realized and obtained through the structures particularly pointed out in the specification, claims and drawings.

[0021] 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.

[0022] 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

[0023] The accompanying drawings, which are included to provide a further understanding of this disclosure and are incorporated in and form part of this application, illustrate embodiments of the disclosure and, together with the specification, serve to explain the principles of the disclosure. In the drawings:

[0024] 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;

[0025] 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.

[0026] Figure 3 It is along Figure 1A A cross-sectional view taken from line III-III';

[0027] 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;

[0028] 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;

[0029] Figure 6 This is a cross-sectional view showing an organic light-emitting diode display device according to a third embodiment of the present disclosure;

[0030] Figure 7 This is a cross-sectional view showing an organic light-emitting diode display device according to the fourth embodiment of the present disclosure. Detailed Implementation

[0031] The advantages and features of this disclosure, as well as its implementation methods, will become apparent from the following exemplary embodiments described with reference to the accompanying drawings. However, this disclosure may be implemented in various forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided so that this disclosure may be thorough and complete and to help those skilled in the art fully understand its scope. Furthermore, the scope of this disclosure is defined only by the scope of the claims.

[0032] The shapes, dimensions, scales, angles, and quantities disclosed in the accompanying drawings used to describe embodiments of this disclosure are merely examples. Therefore, this disclosure is not limited to the details shown. Throughout the application, the same reference numerals refer to the same elements. In the following description, detailed descriptions of relevant known functions or constructions may be omitted where such descriptions unnecessarily obscure the focus of this disclosure. Where the terms "comprising," "having," and "including" are used as described in this application, additional terms may be added unless more restrictive terms such as "only" are used. Unless otherwise stated, singular terms may include plural forms.

[0033] When interpreting a factor, that factor is also interpreted as including a range of errors or tolerances, even if there is no explicit description of such a range of errors or tolerances.

[0034] When describing positional relationships, one or more additional parts may be placed between two parts when the positional relationship between two parts is described as "on," "above," "below," or "next," unless more restrictive terms such as "only" or "directly" are used.

[0035] 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 used only to distinguish one element from another. For example, without departing from the scope of this disclosure, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0036] As will be fully understood by those skilled in the art, the features of the various embodiments of this disclosure may be combined or integrated with each other in part or in whole, and may be interoperable and technically driven in various ways. Embodiments of this disclosure may be implemented independently of each other, or may be implemented together in an interdependent relationship.

[0037] Hereinafter, a display device according to embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Throughout the description, the same reference numerals denote the same elements. Detailed descriptions of well-known functions or constructions relevant to this document will be omitted or will be briefly described when it is determined that such detailed descriptions would unnecessarily obscure the essential points of the inventive concept.

[0038] 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. Figure 2 This is a graph showing the transmittance of an organic light-emitting diode display device according to a first embodiment of the present disclosure, relative to wavelength and the thickness of the transmittance adjustment layer.

[0039] exist Figure 1A and Figure 1B In the organic light-emitting diode display device 100, there are multiple pixels P, each pixel P including 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 a light-emitting area EA, and a dam 119 is provided at the edge of the light-emitting area EA. Figure 3 The non-luminescent region NEA is formed by the surrounding luminescent region EA. The non-luminescent region NEA may surround the luminescent region EA, and thus the non-luminescent region NEA includes an upper portion, a right portion, a lower portion, and a left portion.

[0040] The red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP can be alternately set in the horizontal direction, and each of the red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP can be set in the same line in the vertical direction.

[0041] As a result, the red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP can be arranged in a strip pattern.

[0042] Each of the plurality of pixels P further includes a white sub-pixel W-SP, and a 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.

[0043] Although in the first embodiment the white sub-pixel W-SP, red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP have the same width, in other embodiments the white sub-pixel W-SP, red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP may have different widths.

[0044] A switching thin-film transistor (TFT) STr and a driving TFT DTr are disposed in the non-light-emitting area NEA of each of the white sub-pixel W-SP, red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP, and a light-emitting diode (LED) E is disposed in the light-emitting area EA of each of the white sub-pixel W-SP, red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP. Figure 3 The light-emitting diode (LED) E includes a first electrode 111 ( Figure 3 ), light-emitting layer 113 ( Figure 3 ) and the second electrode 115 ( Figure 3 ).

[0045] The switching TFT STr and the driving TFT DTr are connected to each other, and the driving TFT DTr is connected to LED E.

[0046] Gate line GL, data line DL, and power line VDD are disposed on substrate 101, thereby defining each of white sub-pixel W-SP, red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP.

[0047] The switch TFT STr is connected to the intersecting gate line GL and data line DL to select each of the white sub-pixel W-SP, red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP.

[0048] 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.

[0049] The driving TFT DTr drives the LED E of each of the white sub-pixels W-SP, red sub-pixels R-SP, green sub-pixels G-SP, and blue sub-pixels 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, and a driving semiconductor layer 103 ( Figure 3 ), connected to the power line VDD, the driving source electrode DS, and the driving drain electrode DD.

[0050] The driving drain electrode DD of the driving TFT DTr is connected to the first electrode 111 of the LED E.

[0051] The light-emitting layer 113 is disposed between the first electrode 111 and the second electrode 115 of LED E.

[0052] In the OLED display device 100, a transmittance adjustment layer 200 including a gray dye is provided corresponding to the transmission direction of light emitted from the light-emitting layer 113.

[0053] 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, red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP. The gray pattern 210 may be formed from a mixture of transparent resin and gray dye, and the transparent pattern 220 may be formed from transparent resin.

[0054] Transparent resins may include adhesive resins such as polyester adhesive resins, acrylic adhesive resins, polyurethane adhesive resins, melamine adhesive resins, polyvinyl alcohol adhesive resins, and oxazoline adhesive resins. For example, transparent resins may include acrylic adhesive resins.

[0055] The transmittance adjustment layer 200 can be formed to change the transmittance of the OLED display device 100, and can be adjusted according to the first thickness D1 and the second thickness D2 of the gray pattern 210. Figure 3 Determine the transmittance of the transmittance adjustment layer 200.

[0056] exist Figure 2 In the middle, 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.

[0057] 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.

[0058] 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.

[0059] As a result, the OLED display device 100 without an additional circular polarizer can have various external light reflectivities that are similar to, greater than, or less than the external light reflectivities of the OLED display device with a circular polarizer.

[0060] In the OLED display device 100, gray patterns 210 of the transmittance adjustment layer 200 are provided only for the non-light-emitting area NEA of each of the red sub-pixels R-SP, green sub-pixels G-SP, and blue sub-pixels B-SP, and for the white sub-pixel W-SP. Furthermore, gray patterns 210 and transparent patterns 220 that overlap with each other are provided for the light-emitting area EA of each of the red sub-pixels R-SP, green sub-pixels G-SP, and blue sub-pixels B-SP, and for the non-light-emitting area NEA between the light-emitting areas EA of the red sub-pixels R-SP, green sub-pixels G-SP, and blue sub-pixels B-SP.

[0061] For example, a gray pattern 210 may be provided only on the upper and lower portions of the luminous area EA of the white sub-pixel W-SP; the non-luminous area NEA of the white sub-pixel W-SP; and the non-luminous area NEA of each of the red sub-pixels R-SP, green sub-pixels G-SP, and blue sub-pixels B-SP. An overlapping gray pattern 210 and a transparent pattern 220 may be provided on the left and right portions of the luminous area EA of each of the red sub-pixels R-SP, green sub-pixels G-SP, and blue sub-pixels B-SP; and the non-luminous area NEA of each of the red sub-pixels R-SP, green sub-pixels G-SP, and blue sub-pixels B-SP.

[0062] The transparent pattern 220 can be a monolithic single pattern that covers the light-emitting area EA of each of the red sub-pixels R-SP, green sub-pixels G-SP and blue sub-pixels B-SP; and the non-light-emitting area NEA between the light-emitting areas EA of the red sub-pixels R-SP, green sub-pixels G-SP and blue sub-pixels B-SP.

[0063] As a result, even without a circular polarizer in the OLED display device 100, the external light reflectivity can be minimized by adjusting the transmittance using the transmittance adjustment layer 200.

[0064] Specifically, overlapping transparent patterns 220 and gray patterns 210 are provided corresponding to the light-emitting areas EA of each of the red sub-pixels R-SP, green sub-pixels G-SP, and blue sub-pixels B-SP, so that the transmittance adjustment layer 200 has relatively high transmittance in the light-emitting areas EA of each of the red sub-pixels R-SP, green sub-pixels G-SP, and blue sub-pixels B-SP. As a result, brightness reduction in the red sub-pixels R-SP, green sub-pixels G-SP, and blue sub-pixels B-SP is prevented.

[0065] Because various brightness levels and external light reflectivities can be designed, an OLED display device 100 with optimal brightness and external light reflectivity is provided, thereby expanding product applications and meeting customer needs.

[0066] In addition, by eliminating the relatively expensive circular polarizer, material costs are reduced and manufacturing efficiency is improved.

[0067] Figure 3 It is along Figure 1A The cross-sectional view taken from line III-III'.

[0068] exist Figure 3 In the image, 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 dam 119 is provided at the edge of the light-emitting area EA to form a non-light-emitting area NEA.

[0069] A semiconductor layer 103 is disposed in the switching region TrA of the non-light-emitting region NEA of each of the white sub-pixels W-SP, red sub-pixels R-SP, green sub-pixels G-SP, and blue sub-pixels B-SP on substrate 101. The semiconductor layer 103 may be formed of silicon. For example, the semiconductor layer 103 may include an intrinsic silicon active region 103a at its central portion, and a source region 103b and a drain region 103c of doped silicon on both sides of the active region 103a.

[0070] A gate insulating layer 105 is disposed on the semiconductor layer 103.

[0071] A driving gate electrode DG is provided on the gate insulating layer 105 and above the active region 103a of the semiconductor layer 103, and a gate line GL is provided on the gate insulating layer 105.

[0072] A first interlayer insulating layer 109a is disposed on the driving 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 expose the source region 103b and the drain region 103c, respectively.

[0073] A driving source electrode DS and a driving drain electrode DD are disposed on the first interlayer insulating layer 109a. The driving source electrode DS and the driving drain electrode DD are spaced apart from each other and are connected to the source region 103b and the drain region 103c respectively through the first semiconductor contact hole 116 and the second semiconductor contact hole 117.

[0074] A second interlayer insulating layer 109b is provided on the driving source electrode DS and the driving drain electrode DD, and on the first interlayer insulating layer 109a exposed between the driving source electrode DS and the drain electrode DD.

[0075] The driving source electrode DS and the driving 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 driving gate electrode DG constitute the driving TFT DTr.

[0076] The switching TFT STr has the same structure as the driving TFT DTr and is connected to the driving TFT DTr.

[0077] Although the driving TFT DTr in the first embodiment has a top-gate type in which the semiconductor layer 103 comprises polycrystalline silicon or oxide semiconductor, in another embodiment the driving TFT DTr may have a bottom-gate type in which the semiconductor layer comprises intrinsic amorphous silicon and doped amorphous silicon.

[0078] When the semiconductor layer 103 is formed of an oxide semiconductor, a light-shielding layer may be provided below the semiconductor layer 103, and a buffer layer may be provided between the light-shielding layer and the semiconductor layer 103.

[0079] The second interlayer insulating layer 109b has a drain contact hole PH that exposes the driving drain electrode DD of the driving TFT DTr.

[0080] A first electrode 111 is disposed on the second interlayer insulating layer 109b, and the first electrode 111 is connected to the driving drain electrode DD of the driving TFT DTr through a drain contact hole PH. For example, the first electrode 111 may comprise a material with a relatively high work function to serve as an anode.

[0081] 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 embankment 119 is disposed between the first electrodes 111 in adjacent sub-pixels. With the embankment 119 serving as the 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.

[0082] A light-emitting layer 113 is disposed on the first electrode 111 inside the embankment 119. The light-emitting layer 113 may be a single layer or a multilayer comprising a hole injection layer, a hole transport layer, a light-emitting material layer, an electron transport layer, and an electron injection layer.

[0083] The light-emitting layer 113 of each of the white sub-pixel W-SP, red sub-pixel R-SP, green sub-pixel G-SP and blue sub-pixel B-SP can emit white light.

[0084] A second electrode 115 is disposed on the light-emitting layer 113. For example, the second electrode 115 may comprise a material having a relatively low work function to serve as a cathode.

[0085] 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 to the light-emitting layer 113 to form excitons. When the excitons transition from the excited state to the ground state, light is generated in the light-emitting layer 113, thereby being emitted as visible light.

[0086] The OLED display device 100 has a top-emitting type, where white light from 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.

[0087] Since the switching TFT STr and driving TFT DTr in the top-emitting type are located below the embankment 119 and the first electrode 111, the top-emitting type has a wider design area compared to the bottom-emitting type.

[0088] For example, the first electrode 111 of the anode can be formed of a metallic material with relatively high reflectivity, 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-transparent metallic material such as magnesium (Mg), silver (Ag) and their alloys, thereby transmitting light from the light-emitting layer 113.

[0089] A passivation layer 102 and a packaging substrate 104 are sequentially disposed above the switching TFT STr, the driving TFT DTr, and the LED E. The passivation layer 102 of the thin film 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, thereby protecting the light-emitting layer 113 from the effects of moisture or oxygen.

[0090] The passivation layer 102 protects the switch TFT STr, the drive TFT DTr, and the LED E from external impacts and attaches the substrate 101 and the package substrate 104.

[0091] As a result, the OLED display device 100 was packaged.

[0092] A color conversion layer 106 is disposed on the inner surface of the packaging substrate 104. The color conversion layer 106 includes white color filter patterns W-CF, red color filter patterns R-CF, green color filter patterns G-CF, and blue color filter patterns B-CF, which correspond to the white sub-pixel W-SP, red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP, respectively. The color conversion layer 106 converts the white light from the light-emitting layer 113, and the white color filter patterns W-CF, R-CF, G-CF, and B-CF correspond to the light-emitting areas EA of the white sub-pixel W-SP, R-SP, G-SP, and B-SP, respectively.

[0093] Therefore, 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 high-brightness full-color image.

[0094] The white color filter pattern W-CF can be omitted in the luminous area EA of the white sub-pixel W-SP, and the white light of the luminous layer 113 can pass through the color conversion layer 106 as is.

[0095] A transmittance adjustment layer 200 is further provided on the outer surface of the packaging substrate 104.

[0096] 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 region EA and the non-light-emitting region NEA of the white sub-pixel W-SP, red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP. As a result, the brightness reduction of the white sub-pixel W-SP, red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP is minimized, and the external light reflectance is reduced to a value lower than a reference value.

[0097] Table 1 shows the experimental results of measuring the external light reflectance of the non-emitting and emitting areas of the sub-pixels of the organic light-emitting diode display device according to the comparative example.

[0098] [Table 1]

[0099]

[0100] In Table 1, the external light reflectance of the non-light-emitting area (electrode portion) NEA and the light-emitting area EA of the white sub-pixel is higher than that of the light-emitting areas EA of the red, green and blue sub-pixels.

[0101] As a result, the external light reflectance of the emitting regions EA of the red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP slightly affects the external light reflectance of the OLED display device, while the external light reflectance of the non-emitting region NEA corresponding to the electrode portion and the emitting region EA of the white sub-pixel W-SP significantly affects the external light reflectance of the OLED display device.

[0102] In the OLED display device 100 according to the first embodiment of this disclosure, the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the non-emitting region NEA and the 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 in the non-emitting region NEA and the emitting region EA of the white sub-pixel W-SP is significantly reduced, and the external light reflectance of the non-emitting region NEA and the emitting region EA of the white sub-pixel W-SP is significantly reduced.

[0103] Therefore, due to the gray pattern 210 of the first thickness D1, the total external light reflectivity of the OLED display device 100 is reduced.

[0104] 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, green sub-pixel G-SP, and blue sub-pixel B-SP is formed to have a second thickness D2 that is less than the first thickness D1. As a result, the transmittance of the transmittance adjustment layer 200 in the light-emitting region EA of each of the red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP is slightly reduced, and the external light reflectance of the light-emitting region EA of each of the red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP is slightly reduced.

[0105] Since the brightness of the red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP did not decrease significantly, the brightness reduction of the OLED display device 100 was prevented.

[0106] The total transmittance of the gray pattern 210 of the transmittance adjustment layer 200 can be obtained from the unit transmittance and thickness according to Equation 1 below.

[0107] [Equation 1]

[0108] Total transmittance = unit transmittance thickness

[0109] 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.

[0110] In Table 1, when the external light reflectance of the non-emitting region NEA is approximately 9.74%, it can be based on "9.74%". A 2 "Determine the first thickness D1 of the gray pattern 210 in the non-emitting region 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 about 50% transmittance, the reflectance in the non-emitting region NEA can be designed to be about 2.43%."

[0111] 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, so that the non-emitting area NEA and the emitting area EA of the white sub-pixel W-SP, red sub-pixel R-SP, green sub-pixel G-SP and blue sub-pixel B-SP have the target transmittance.

[0112] For example, the gray pattern 210 of the transmittance adjustment layer 200 having a 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 a second thickness D2 can be formed to have a transmittance of about 70%.

[0113] Therefore, in the OLED display device 100 according to the first embodiment of the present disclosure, the external light reflectivity is minimized, and the brightness reduction of the red sub-pixel R-SP, green sub-pixel G-SP and blue sub-pixel B-SP is prevented.

[0114] Furthermore, brightness is increased. Additionally, by eliminating the need for a relatively expensive circular polarizer, material costs are reduced and manufacturing efficiency is improved.

[0115] Specifically, ideal white light can be obtained even without performing additional white correction (WCT). As a result, increased power consumption in the blue sub-pixel B-SP and reduced lifetime of LED E in the blue sub-pixel B-SP are prevented.

[0116] Because the transmission adjustment layer 200, which includes a gray dye, is configured to correspond to the transmission direction of light emitted from the light-emitting layer 113, external light reflectivity is minimized and brightness is increased. As a result, ideal white light can be obtained even without performing additional white correction (WCT).

[0117] The chromaticity of a light source, or a reference white, can be expressed as the temperature of the region closest to it on the radiation curve, rather than as coordinates in a two-dimensional color space. This temperature can be called correlated color temperature (CCT) or color temperature. Color temperature is used as a value to indicate how close white is to a given color. For example, a CCT of approximately 10,000 K is required.

[0118] 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 this disclosure.

[0119] exist Figure 4A In the comparative example, since the OLED display device including the circular polarizer has a relatively low brightness, a CCT of approximately 6500K is obtained by using white sub-pixels W-SP, blue sub-pixels B-SP, and green sub-pixels G-SP via WCT.

[0120] For example, in an OLED display device including a circular polarizer according to a comparative example, white with a CCT of approximately 6500K is obtained by simultaneously driving the white sub-pixel W-SP, the blue sub-pixel B-SP, and the green sub-pixel G-SP.

[0121] Because the blue sub-pixel B-SP has lower efficiency compared to the white sub-pixel W-SP and the green sub-pixel G-SP, higher power consumption is required for WCT. As a result, the lifespan of the LEDs in the blue sub-pixel B-SP is shortened, and the efficiency of the OLED display device is reduced.

[0122] exist Figure 4BIn the OLED display device 100 according to the first embodiment of the present disclosure, since a gray pattern 210 with a first thickness D1 is provided corresponding to the white sub-pixel W-SP, even when the transmittance of the white sub-pixel W-SP decreases to about 50%, the brightness of the white sub-pixel W-SP is increased compared to an OLED display device including a circular polarizer.

[0123] As a result, white with a CCT of approximately 10000K was obtained by driving the white sub-pixel W-SP.

[0124] Table 2 shows the experimental results of unit transmittance, color coordinates, external light reflectance, and 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 present disclosure.

[0125] [Table 2]

[0126]

[0127] In Table 2, Sample 1 represents an OLED display device including a circular polarizer according to a comparative example, and Sample 2 represents an OLED display device according to the first embodiment of the present disclosure, wherein the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the non-emitting region NEA and the emitting region EA of the white sub-pixel W-SP has a transmittance of approximately 90%.

[0128] Sample 3 represents an OLED display device according to the first embodiment of the present disclosure, wherein the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the non-emitting region NEA and the emitting region EA of the white sub-pixel W-SP has a transmittance of approximately 80%. Sample 4 represents an OLED display device according to the first embodiment of the present disclosure, wherein the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the non-emitting region NEA and the emitting region EA of the white sub-pixel W-SP has a transmittance of approximately 70%. Sample 5 represents an OLED display device according to the first embodiment of the present disclosure, wherein the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the non-emitting region NEA and the emitting region EA of the white sub-pixel W-SP has a transmittance of approximately 60%. Sample 6 represents an OLED display device according to the first embodiment of the present disclosure, wherein the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the non-emitting region NEA and the emitting region EA of the white sub-pixel W-SP has a transmittance of approximately 50%.

[0129] In samples 2, 3, 4, 5 and 6, the gray pattern 210 corresponding to the luminescent area 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%.

[0130] For a CCT of approximately 10,000 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), a CCT of approximately 10,000 K was not obtained in sample 1 of the OLED display device including the circular polarizer.

[0131] Although white coordinates (0.281, 0.288) corresponding to a CCT of approximately 10,000 K were not obtained in OLED display device samples 2, 3, 4, and 5, white coordinates (0.284, 0.290) were obtained in OLED display device sample 6, which includes a gray pattern 210 of a transmittance adjustment layer 200 with approximately 50% transmittance. The white coordinates of sample 6 are very close to the white coordinates corresponding to a CCT of approximately 10,000 K.

[0132] Specifically, sample 6 has an external light reflectance similar to that of sample 1, an OLED display device including a circular polarizer, and sample 6 has a total transmittance that is about 15% higher than that of sample 1, an OLED display device including a circular polarizer.

[0133] In the OLED display device 100 according to the first embodiment of this disclosure, the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the non-emitting region NEA and the emitting region EA of the white sub-pixel W-SP has a transmittance of approximately 50%, and the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the emitting regions EA of the red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP has a transmittance of approximately 70%. As a result, even without an additional circular polarizer, the external light reflectivity is minimized, and the brightness reduction of the red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP is prevented.

[0134] Furthermore, due to the increased brightness of the OLED display device 100, ideal white light can be obtained even when no additional WCT is performed.

[0135] Therefore, it prevents the increase in power consumption of the blue sub-pixel B-SP and the shortening of the lifespan of the LEDs in the blue sub-pixel B-SP.

[0136] In the OLED display device 100 according to the first embodiment of this disclosure, the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the non-emitting region NEA and the emitting region 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 region EA of each of the red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP, and the non-emitting region NEA between the emitting regions EA of the red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP, has a second thickness D2 less than the first thickness D1, such that the gray pattern 210 corresponding to the non-emitting region NEA and the emitting region EA of the white sub-pixel W-SP has a transmittance of approximately 50%, and the gray pattern 210 corresponding to the emitting region EA of each of the red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP has a transmittance of approximately 70%. As a result, the gray pattern 210 of the transmittance adjustment layer 200 has a step difference.

[0137] To compensate for the step difference of the gray pattern 210, a transparent pattern 220 overlapping with the gray pattern 210 having a second thickness D2 can be provided above or below the gray pattern 210 having a second thickness D2.

[0138] The transmittance adjustment layer 200, including the transparent pattern 220, may have a refractive index equal to or similar to that of the packaging substrate 104. As a result, when light from the white sub-pixel W-SP, red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP passes through the packaging substrate 104 and enters the transmittance adjustment layer 200, refraction and loss of light at the interface between the packaging substrate 104 and the transmittance adjustment layer 200 are prevented, and an increase in external light reflectivity is prevented.

[0139] Figure 5 This is a cross-sectional view showing an organic light-emitting diode (OLED) display device according to a second embodiment of the present disclosure. The OLED display device according to the second embodiment has a bottom-emitting type.

[0140] exist Figure 5 In the substrate 101, a driving thin-film transistor (TFT) DTr is formed in the switching region TrA of the non-light-emitting region NEA. The TFT includes 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. White color filter patterns W-CF, red color filter patterns R-CF, green color filter patterns G-CF, and blue color filter patterns B-CF are formed in the light-emitting regions EA of the white sub-pixel W-SP, red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP, respectively, on the first interlayer insulating layer 109a.

[0141] 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 drive drain electrode DD through the gate insulating layer 105 and the drain contact hole PH in the first interlayer insulating layer 109a.

[0142] 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 embankment 119 is disposed between the first electrodes 111 of adjacent sub-pixels.

[0143] A light-emitting layer 113 is disposed on the first electrode 111 inside the embankment 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 the anode and the 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.

[0144] A passivation layer 102 and an encapsulation substrate 104 are sequentially disposed above the driving TFT DTr and LED E, thereby encapsulating the OLED display device 100.

[0145] In the bottom-emitting 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.

[0146] A transmittance adjustment layer 200, comprising 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, a gray pattern 210 of the transmittance adjustment layer 200 is provided only for the non-light-emitting area NEA of each of the red sub-pixels R-SP, green sub-pixels G-SP, and blue sub-pixels B-SP, and for the white sub-pixel W-SP. Furthermore, gray patterns 210 and transparent patterns 220 that overlap each other are provided for the light-emitting area EA of each of the red sub-pixels R-SP, green sub-pixels G-SP, and blue sub-pixels B-SP, and for the non-light-emitting area NEA between the light-emitting areas EA of the red sub-pixels R-SP, green sub-pixels G-SP, and blue sub-pixels B-SP.

[0147] In the OLED display device 100 according to the second embodiment of this disclosure, the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the non-emitting region NEA and the emitting region EA of the white sub-pixel W-SP has a transmittance of approximately 50%, and the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the emitting regions EA of the red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP has a transmittance of approximately 70%. As a result, even without an additional circular polarizer, the external light reflectivity is minimized, and the brightness reduction of the red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP is prevented.

[0148] Furthermore, due to the increased brightness of the OLED display device 100, ideal white light can be obtained even when no additional WCT is performed.

[0149] Therefore, it prevents the increase in power consumption of the blue sub-pixel B-SP and the shortening of the lifespan of the LEDs in the blue sub-pixel B-SP.

[0150] Figure 6 This is a cross-sectional view showing an organic light-emitting diode display device according to a third embodiment of the present disclosure.

[0151] exist Figure 6 In the substrate 101, a driving thin-film transistor (TFT) DTr is disposed in the switching region TRA of the non-light-emitting region NEA. The TFT includes 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. A first electrode 111 is disposed in the light-emitting region EA on the second interlayer insulating layer 109b. The first electrode 111 is connected to the driving drain electrode DD through the gate insulating layer 105 and the drain contact hole PH in the first interlayer insulating layer 109a.

[0152] 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 embankment 119 is disposed between the first electrodes 111 of adjacent sub-pixels.

[0153] A white light-emitting layer 113a, a red light-emitting layer 113b, a green light-emitting layer 113c, and a blue light-emitting layer 113d are respectively disposed on the first electrode 111 inside the embankment 119 in the white sub-pixel W-SP, red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP. The white light-emitting layer 113a, red light-emitting layer 113b, green light-emitting layer 113c, and 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 the anode and the cathode, respectively. Each of the first electrode 111, 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.

[0154] A passivation layer 102 and an encapsulation substrate 104 are sequentially disposed above the driving TFT DTr and LED E, thereby encapsulating the OLED display device 100.

[0155] A transmittance adjustment layer 200 is provided corresponding to the transmission direction of light emitted from the white light-emitting layer 113a, red light-emitting layer 113b, green light-emitting layer 113c, and blue light-emitting layer 113d. In the OLED display device 100, a gray pattern 210 of the transmittance adjustment layer 200 is provided only for the non-light-emitting area NEA of each of the red sub-pixels R-SP, green sub-pixels G-SP, and blue sub-pixels B-SP, and for the white sub-pixel W-SP. Furthermore, an overlapping gray pattern 210 and a transparent pattern 220 are provided for the light-emitting area EA of each of the red sub-pixels R-SP, green sub-pixels G-SP, and blue sub-pixels B-SP, and for the non-light-emitting area NEA between the light-emitting areas EA of the red sub-pixels R-SP, green sub-pixels G-SP, and blue sub-pixels B-SP.

[0156] Specifically, a brightness enhancement film 230 can be provided on the transmittance adjustment layer 200.

[0157] As a result, the OLED display device 100 according to the third embodiment of this disclosure has the same external light reflectivity as the OLED display device with a circular polarizer, and has a brightness that is about 30% higher than that of the OLED display device with a circular polarizer.

[0158] Table 3 shows the experimental results of transmittance, color coordinates, luminance, and external light reflectance of the organic light-emitting diode display device according to the comparative example and the third embodiment of this disclosure.

[0159] [Table 3]

[0160]

[0161] In Table 3, Sample A represents the OLED display device including the brightness enhancement film according to the comparative example. Sample A does not meet the white coordinates (0.281, 0.288) corresponding to the CCT of 10000K.

[0162] Sample B represents an OLED display device 100 according to the third embodiment of this disclosure, wherein the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the non-emitting region NEA and the emitting region EA of the white sub-pixel W-SP has a transmittance of approximately 50%, and the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the 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 transmittance of approximately 70%. In the OLED display device 100 of Sample B, a brightness enhancement film is further provided on the transmittance adjustment layer. As a result, an external light reflectance of approximately 4.0% and white coordinates (0.282, 0.288) corresponding to a CCT of 10000K are obtained.

[0163] Specifically, when the full white brightness of the OLED display device of sample A is approximately 100%, the full white brightness of the OLED display device 100 of sample B is approximately 135%. As a result, the full white brightness increased by approximately 35%, and the red, green, and blue brightness increased by approximately 38%.

[0164] In the OLED display device 100 according to the third embodiment of this disclosure, the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the non-emitting region NEA and the emitting region EA of the white sub-pixel W-SP has a transmittance of approximately 50%, and the gray pattern 210 of the transmittance adjustment layer 200 corresponding to the emitting regions EA of the red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP has a transmittance of approximately 70%. As a result, even without an additional circular polarizer, the external light reflectivity is minimized, and the brightness reduction of the red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP is prevented.

[0165] Furthermore, due to the increased brightness of the OLED display device 100, ideal white light can be obtained even when no additional WCT is performed.

[0166] Specifically, because various brightness levels and external light reflectivities can be designed, an OLED display device 100 with optimal brightness and external light reflectivity is provided, thereby expanding product applications and meeting customer needs. Furthermore, by eliminating the relatively expensive circular polarizer, material costs are reduced and manufacturing efficiency is improved.

[0167] Figure 7 This is a cross-sectional view showing an organic light-emitting diode display device according to the fourth embodiment of the present disclosure.

[0168] exist Figure 7 In the substrate 101, a driving thin-film transistor (TFT) DTr is disposed in the switching region TRA of the non-light-emitting region NEA. The TFT includes 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. A first electrode 111 is disposed in the light-emitting region EA on the second interlayer insulating layer 109b. The first electrode 111 is connected to the driving drain electrode DD through the gate insulating layer 105 and the drain contact hole PH in the first interlayer insulating layer 109a.

[0169] 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 embankment 119 is disposed between the first electrodes 111 of adjacent sub-pixels.

[0170] In each of the white sub-pixel W-SP, red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP, a light-emitting layer 113 is disposed on a first electrode 111 inside the embankment 119, and a second electrode 115 is disposed 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.

[0171] A passivation layer 102 and a color conversion layer 106 are sequentially disposed above the driving TFT DTr and LED E.

[0172] The color conversion layer 106 includes a red filter pattern R-CF, a green filter pattern G-CF, and a blue filter pattern B-CF, which correspond to the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP, respectively. The red filter pattern R-CF, the green filter pattern G-CF, and the blue filter pattern B-CF are respectively set to correspond to the light-emitting area EA of the red sub-pixel R-SP, the green sub-pixel G-SP, and the blue sub-pixel B-SP.

[0173] A transmittance adjustment layer 200 is provided to cover the red color filter pattern R-CF, green color filter pattern G-CF, and 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, green color filter pattern G-CF, and blue color filter pattern B-CF in the red sub-pixel R-SP, green sub-pixel G-SP, and blue sub-pixel B-SP, and the transmittance adjustment layer 200 is disposed on the passivation layer 102 to wrap the upper and side surfaces of the red color filter pattern R-CF, green color filter pattern G-CF, and blue color filter pattern B-CF.

[0174] As a result, the transmittance adjustment layer 200 corresponding to the non-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 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 that is less than the first thickness D1.

[0175] 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.

[0176] The transmittance adjustment layer 200 may be formed from a mixture of a transparent resin and a gray dye. The transparent resin may include acrylic or epoxy resins that have excellent insulating properties and do not react with external materials. For example, the transparent resin may include optical acrylic (PAC).

[0177] The transmittance adjustment layer 200, including optical acrylic, degassing the red color filter pattern R-CF, green color filter pattern G-CF, and blue color filter pattern B-CF and blocking moisture. Furthermore, the transmittance adjustment layer 200, including optical acrylic, compensates for the step differences in the red color filter pattern R-CF, green color filter pattern G-CF, and blue color filter pattern B-CF, thereby planarizing the surface of the OLED display device 100.

[0178] Specifically, since the transmittance adjustment layer 200 includes a gray dye, the OLED display device 100 has various transmittances. Because the transmittance adjustment layer 200 corresponding to the non-emitting region NEA of each of the red sub-pixels R-SP, green sub-pixels G-SP, and blue sub-pixels B-SP, and the white sub-pixel W-SP, has a first thickness D1, and the transmittance adjustment layer 200 corresponding to the emitting region EA of each of the red sub-pixels R-SP, green sub-pixels G-SP, and blue sub-pixels B-SP, has a second thickness D2, the OLED display device 100 corresponding to the non-emitting region NEA of each of the red sub-pixels R-SP, green sub-pixels G-SP, and blue sub-pixels B-SP, and the white sub-pixel W-SP, has a relatively low transmittance, and the OLED display device 100 corresponding to the emitting region EA of each of the red sub-pixels R-SP, green sub-pixels G-SP, and blue sub-pixels B-SP, has a relatively high transmittance.

[0179] In the OLED display device 100 according to the fourth embodiment of this disclosure, the transmittance adjustment layer 200 corresponding to the non-emitting region NEA and the emitting region EA of the white sub-pixel W-SP has a transmittance of approximately 50%, and the transmittance adjustment layer 200 corresponding to the 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 transmittance of approximately 70%. As a result, the external light reflectance is minimized to approximately 6%, and a CCT of approximately 10000K is obtained.

[0180] Therefore, an OLED display device with relatively low reflectivity and relatively high brightness is provided because the external light reflectivity is minimized and the brightness of the red sub-pixel R-SP, green sub-pixel G-SP and blue sub-pixel B-SP is increased.

[0181] Lifespan and efficiency are improved while power consumption is reduced.

[0182] Furthermore, since various brightness levels and external light reflectivities can be designed, an OLED display device 100 with optimal brightness and external light reflectivity is provided, thereby expanding product applications and meeting customer needs. In addition, by eliminating the relatively expensive circular polarizer, material costs are reduced and manufacturing efficiency is improved.

[0183] In particular, manufacturing efficiency is further improved because additional planarization processes and encapsulation substrates are omitted in the OLED display device 100, which includes the red color filter pattern R-CF, the green color filter pattern G-CF, and the blue color filter pattern B-CF.

[0184] It will be apparent to those skilled in the art that various modifications and variations may be made to this disclosure without departing from the spirit or scope thereof. Therefore, this disclosure is intended to cover modifications and variations that fall within the scope of the appended claims and their equivalents.

Claims

1. An organic light-emitting diode (OLED) display device, comprising: A first substrate and a second substrate facing each other and spaced apart, the first substrate and the second substrate comprising a plurality of sub-pixels; Thin-film transistors located in each of the plurality of sub-pixels on the inner surface of the first substrate; A light-emitting diode located in each of the plurality of sub-pixels on the thin-film transistor; A passivation layer comprising at least one thin film on the light-emitting diode; Multiple color filter patterns corresponding to the multiple sub-pixels; A color conversion layer between the passivation layer and the second substrate; as well as Transmittance adjustment layer on the outer surface of the second substrate.

2. The organic light-emitting diode display device according to claim 1, wherein the light-emitting diode includes an anode, a light-emitting layer on the anode, and a cathode on the light-emitting layer.

3. The organic light-emitting diode display device according to claim 2, wherein the passivation layer is disposed on the cathode.

4. The organic light-emitting diode display device according to claim 1, wherein the transmittance adjustment layer comprises a transparent resin and a gray dye.

5. The organic light-emitting diode display device according to claim 4, wherein the transparent resin comprises one of polyester adhesive resin, acrylic adhesive resin, polyurethane adhesive resin, melamine adhesive resin, polyvinyl alcohol adhesive resin, and oxazoline adhesive resin.

6. The organic light-emitting diode display device according to claim 1, wherein the color conversion layer is disposed between the plurality of color filter patterns and the second substrate.

7. The organic light-emitting diode display device according to claim 1, wherein the external light reflectivity is proportional to the transmittance of the transmittance adjustment layer.

8. The organic light-emitting diode display device according to claim 1, wherein the transmittance adjustment layer comprises a gray pattern having a gray dye and a transparent pattern, and As the thickness of the gray pattern increases, the transmittance of the transmittance adjustment layer decreases.

9. The organic light-emitting diode display device according to claim 1, wherein the plurality of sub-pixels includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and each of the red sub-pixel, the green sub-pixel, and the blue sub-pixel has a light-emitting area and a non-light-emitting area.

10. The organic light-emitting diode display device according to claim 9, wherein the plurality of sub-pixels further includes white sub-pixels, and the white sub-pixels have light-emitting areas and non-light-emitting areas.

11. The organic light-emitting diode display device of claim 10, wherein a first portion of the transmittance adjustment layer corresponding to the light-emitting region of the white sub-pixel has a first transmittance, and a second portion of the transmittance adjustment layer corresponding to the light-emitting region of each of the red sub-pixel, the green sub-pixel, and the blue sub-pixel has a second transmittance higher than the first transmittance.

12. The organic light-emitting diode display device according to claim 11, wherein the transmittance adjustment layer comprises a gray pattern having a gray dye and a transparent pattern.

13. The organic light-emitting diode display device of claim 12, wherein the transparent pattern overlaps with the light-emitting area of ​​each of the red sub-pixel, the green sub-pixel and the blue sub-pixel and is offset from the light-emitting area of ​​the white sub-pixel.

14. The organic light-emitting diode display device of claim 12, wherein the gray pattern corresponding to the non-light-emitting area between the red sub-pixel, the green sub-pixel and the blue sub-pixel has the second transmittance.

15. The organic light-emitting diode display device of claim 12, wherein the gray pattern having the first transmittance has a first thickness, and the gray pattern having the second transmittance has a second thickness less than the first thickness.

16. The organic light-emitting diode display device of claim 15, wherein the gray pattern having the second transmittance overlaps with the transparent pattern.

17. The organic light-emitting diode display device of claim 12, wherein the transparent pattern is disposed between the plurality of color filter patterns and the gray pattern.

Images