DISPLAY DEVICE

Abstract

A display device may include a first substrate defining a plurality of sub-pixels, a plurality of blue light-emitting elements respectively disposed on the plurality of sub-pixels, a plurality of color conversion layers, a plurality of color filters, a second substrate, and a first transmittance adjusting layer disposed below the second substrate and configured to surround the plurality of color filters. The first transmittance adjusting layer includes a first layer disposed below the second substrate and a second layer disposed below the first layer of the first transmittance adjusting layer. The second layer of the first transmittance adjusting layer has a lower transmittance than the first layer of the first transmittance adjusting layer. Therefore, it is possible to improve color characteristics.

Description

[0001] This application claims priority to Korean Patent Application No. 10-2024-0022497, filed with the Korean Intellectual Property Office on February 16, 2024. Area

[0002] The present disclosure relates to a display device, and more particularly to a display device capable of improving color characteristics. Discussion of the state of the art

[0003] As display devices for computer monitors, televisions, mobile phones and the like, there are an organic light-emitting display (OLED), which is designed to emit light autonomously, and a liquid crystal display (LCD), which requires a separate light source.

[0004] The application range of display devices can be diverse, from computer monitors and televisions to personal mobile devices, and research is being conducted on display devices with large display areas and reduced volume and weight.

[0005] In addition, a light-emitting diode (LED) display has recently attracted attention as a next-generation display device. Because the LED is made of an inorganic material rather than an organic material, it is more reliable and has a longer lifespan than a liquid crystal display or an organic light-emitting display. Furthermore, the LED can be quickly turned on or off, has excellent luminous efficiency, high shock resistance, and high stability, and displays images with high brightness. SUMMARY OF REVELATION

[0006] It is an object to be achieved by the present disclosure to provide a display device capable of improving luminance and color characteristics and / or a method for manufacturing the same.

[0007] It is a further object to be achieved by the present disclosure to provide a display device that can minimize a reduction in the efficiency of blue light and / or a method for manufacturing the same.

[0008] The objects of the present disclosure are not limited to the above-mentioned objects, and other objects not mentioned above will be clearly apparent to those skilled in the art from the following descriptions.

[0009] Each of the above-mentioned objects is achieved by the features of the independent claims. Further aspects of the display device are specified in the respective dependent claims.

[0010] A display device according to one aspect of the present disclosure includes a first substrate on which a plurality of sub-pixels are defined, a plurality of blue light-emitting elements respectively disposed on the plurality of sub-pixels, a plurality of color conversion layers disposed on the plurality of blue light-emitting elements in a red sub-pixel and a green sub-pixel among the plurality of sub-pixels, a plurality of color filters disposed on the plurality of color conversion layers in the red sub-pixel and the green sub-pixel, a second substrate disposed on the plurality of color filters, and a first transmittance adjustment layer disposed under the second substrate and configured to surround the plurality of color filters, wherein the first transmittance adjustment layer comprises a first layer disposed under the second substrate and a second layer,which is arranged under the first layer of the first transmittance adjustment layer and has a lower transmittance than the first layer of the first transmittance adjustment layer.,

[0011] According to another aspect of the present disclosure, there is provided a method for manufacturing a display device, the method comprising: providing a first substrate on which a plurality of sub-pixels are defined, the plurality of sub-pixels comprising a red sub-pixel and a green sub-pixel; disposing a plurality of blue light-emitting elements respectively on the plurality of sub-pixels; disposing a plurality of color conversion layers on the plurality of blue light-emitting elements in the red sub-pixel and the green sub-pixel; disposing a plurality of color filters on the plurality of color conversion layers in the red sub-pixel and the green sub-pixel; disposing a first transmittance adjustment layer so as to surround the plurality of color filters; disposing a second substrate on the plurality of color filters and the first transmittance adjustment layer;wherein the first transmittance adjusting layer comprises a first layer disposed under the second substrate; and a second layer disposed under the first layer of the first transmittance adjusting layer, the second layer having a lower transmittance than the first layer of the first transmittance adjusting layer.

[0012] The display devices according to the above aspects may further comprise one or more of the following features:

[0013] A width of a cross section of the first layer of the first transmittance adjusting layer may decrease as a distance of the cross section from the second substrate increases.

[0014] An area of ​​a lower surface of the first layer of the first transmittance adjusting layer may be equal to an area of ​​an upper surface of the second layer of the first transmittance adjusting layer.

[0015] An area of ​​a lower surface of the first layer of the first transmittance adjusting layer may be larger than an area of ​​an upper surface of the second layer of the first transmittance adjusting layer. The second layer of the first transmittance adjusting layer may be arranged so that it is close to one side of an end of the lower surface of the first layer of the first transmittance adjusting layer.

[0016] A transmittance of the first layer of the first transmittance adjustment layer may be 70%.

[0017] An end of an upper surface of the first layer of the first transmittance adjusting layer may be positioned at a position corresponding to a 45-degree inclination angle to a center point of the corresponding one of the plurality of blue light-emitting elements. The center point of the blue light-emitting element may be the center point of a light-emitting layer of the blue light-emitting element. The 45-degree inclination angle may be an inclination angle of a vertex that is the center point. The 45-degree inclination angle may be formed with a normal passing through the center point perpendicular to the light-emitting layer of the blue light-emitting element. The 45-degree inclination angle may be formed between the normal and a line connecting the center point to the end of the upper surface of the first layer of the first transmittance adjusting layer.The center point may form a vertex for the lines connecting the center point to respective positions at the end of the upper surface of the first layer of the first transmittance adjusting layer.

[0018] The second layer of the first transmittance adjustment layer may contain a black material.

[0019] An end of an upper surface of the second layer of the first transmittance adjusting layer may be arranged at a position corresponding to an inclination angle of 60 degrees to a center point of the corresponding one of the plurality of blue light-emitting elements. The center point of the blue light-emitting element may be the center point of a light-emitting layer of the blue light-emitting element. The inclination angle of 60 degrees may be an inclination angle of a vertex that is the center point. The inclination angle of 60 degrees may be formed with a normal passing through the center point perpendicular to the light-emitting layer of the blue light-emitting element. The inclination angle of 60 degrees may be formed between the normal and a line connecting the center point to the end of the upper surface of the first layer of the first transmittance adjusting layer.The center point may form a vertex for the lines connecting the center point to respective positions at the end of the upper surface of the first layer of the first transmittance adjustment layer.

[0020] The display device may further comprise a first transparent layer disposed on the plurality of blue light-emitting elements and corresponding to the color conversion layer. The first transparent layer may be disposed in a blue sub-pixel among the plurality of sub-pixels. The display device may further comprise a second transparent layer disposed on the first transparent layer and corresponding to the plurality of color filters. The second transparent layer may be disposed in the blue sub-pixel.

[0021] The display device may further comprise a second transmittance adjustment layer disposed beneath the second substrate and corresponding to the first transmittance adjustment layer. The second transmittance adjustment layer may be configured to surround the second transparent layer.

[0022] The second transmittance adjustment layer may comprise a first layer disposed beneath the second substrate. The second transmittance adjustment layer may comprise a second layer disposed beneath the first layer of the second transmittance adjustment layer. The second layer may have a lower transmittance than the first layer of the second transmittance adjustment layer.

[0023] An end of an upper surface of the first layer of the second transmittance adjusting layer may be arranged at a position corresponding to an inclination angle of 60 degrees to a center of the corresponding one of the plurality of blue light-emitting elements. The center of the blue light-emitting element may be the center of a light-emitting layer of the blue light-emitting element. The inclination angle of 60 degrees may be an inclination angle of a vertex that is the center. The inclination angle of 60 degrees may be formed with a normal passing through the center perpendicular to the light-emitting layer of the blue light-emitting element. The inclination angle of 60 degrees may be formed between the normal and a line connecting the center to the end of the upper surface of the first layer of the first transmittance adjusting layer.The center point may form a vertex for the lines connecting the center point to respective positions at the end of the upper surface of the first layer of the first transmittance adjusting layer.

[0024] A transmittance of the first layer of the second transmittance adjustment layer may be 70%. The second layer of the second transmittance adjustment layer may contain a black material.

[0025] An area of ​​a lower surface of the first layer of the second transmittance adjusting layer may be larger than an area of ​​an upper surface of the second layer of the second transmittance adjusting layer. The second layer of the second transmittance adjusting layer may be arranged to be close to one side of an end of the lower surface of the first layer of the second transmittance adjusting layer. Other details of the embodiments of the present disclosure are included in the detailed description and the drawings.

[0026] According to aspects of the present disclosure, the banks may be arranged in two stages and correspond to the plurality of pixels at the same time, thereby improving the luminance and color characteristics.

[0027] According to aspects of the present disclosure, it is possible to minimize color deviation according to a viewing angle.

[0028] According to aspects of the present disclosure, blue light is emitted in an intact manner, which can minimize a decrease in light emission efficiency.

[0029] The effects according to aspects of the present disclosure are not limited to the above-exemplified content, and more diverse effects are included in the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and other aspects, features and advantages of the present disclosure will become more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: Fig. 1 is a schematic plan view of a display device according to an embodiment of the present disclosure; Fig. 2 is a plan view showing a part of the display area according to the embodiment of the present disclosure; Fig. 3 a cross-sectional view along the line III-III' in Fig. 2; Fig. 4 a cross-sectional view along the line IV-IV' in Fig. 2; Fig. 5 is a diagram showing viewing angles for respective sub-pixels of the display device according to a comparative example; Fig. 6 is an enlarged cross-sectional view showing a green sub-pixel and a red sub-pixel of a display device according to another embodiment of the present disclosure; and Fig. 7 is an enlarged cross-sectional view showing a blue sub-pixel of the display device according to another embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] Advantages and features of the present disclosure, and a method for achieving the advantages and features, will become apparent when reference is made to the embodiments described in detail below, together with the accompanying drawings. The embodiments are provided by way of example so that those skilled in the art may fully understand the disclosures of the present disclosure and the scope of the present disclosure.

[0032] The shapes, sizes, ratios, angles, numbers, and the like illustrated in the accompanying drawings for describing embodiments of the present disclosure are merely examples, and the present disclosure is not limited thereto. Like reference numerals generally designate like elements throughout the disclosure. Furthermore, in the following description of the present disclosure, detailed explanation of known related technologies may be omitted to avoid unnecessarily obscuring the subject matter of the present disclosure. The terms "comprising," "having," and "consisting of" as used herein are generally intended to allow the addition of other components unless the terms are used with the term "only." All references to the singular may include the plural unless expressly stated otherwise.

[0033] Components are designed to include a normal error range, even if this is not explicitly stated.

[0034] When the positional relationship between two parts is described with terms such as "on", "over", "under" and "next to", one or more parts may be positioned between the two parts, unless the terms are used with the term "immediate" or "direct".

[0035] When one element or layer is placed "on top of" another element or layer, another layer or element can be placed directly on top of the other element or between them.

[0036] Although the terms "first," "second," and the like are used to describe various components, these components are not limited to these terms. These terms are used merely to distinguish one component from the other components and may not define an order or sequence. Therefore, a first component mentioned below may be a second component in a technical concept of the present disclosure.

[0037] Like reference numerals generally refer to like elements throughout the disclosure. Furthermore, the term "may" fully encompasses all meanings and the full scope of the term "can."

[0038] The size and thickness of each component shown in the drawing are shown for convenience, and the present disclosure is not limited to the size and thickness of the component shown.

[0039] The features of various embodiments of the present disclosure may be partially or completely bound or combined with each other and may be interlocked and operated in technically different ways, and the embodiments may be practiced independently of each other or in conjunction with each other.

[0040] Various exemplary embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. All components of each display device according to all embodiments of the present disclosure are operatively coupled and configured.

[0041] Fig. 1 is a schematic configuration view of a display device according to an embodiment of the present disclosure and shows a schematic plan view of the display device according to the embodiment of the present disclosure. For convenience, Fig. 1 a first substrate 110 and a plurality of subpixels SP among various components of a display device 100.

[0042] With reference to Fig. 1, the first substrate 110 is a component for supporting various components included in the display device 100 and may be made of an insulating material. For example, the first substrate 110 may be made of glass, resin, or the like. Furthermore, the first substrate 110 may contain a plastic such as a polymer and be made of a flexible material.

[0043] The first substrate 110 includes a display area AA (or active area) and a non-display area NA (or non-active area). The non-display area NA may completely or partially surround the display area AA.

[0044] The display area AA is an area where the plurality of sub-pixels SP are arranged to display images. A display element, a drive circuit for driving the display element, and the like may be arranged in each of the plurality of sub-pixels SP in the display area AA. For example, an LED, a transistor for driving the LED, and the like may be arranged in each of the plurality of sub-pixels SP.

[0045] The non-display region NA is a region where no image is displayed. Various wirings, drive ICs (drive integrated circuits), and the like for driving the sub-pixels SP arranged in the display region AA are arranged. For example, various drive ICs such as a gate drive IC and a data drive IC, and various drive circuits may be arranged in the non-display region NA. Meanwhile, the non-display region NA may be positioned on a back surface of the first substrate 110, that is, a surface on which the sub-pixel SP is not present. Alternatively, the non-display region NA may be omitted. However, the present disclosure is not limited to the configuration shown in the drawings.

[0046] The plurality of sub-pixels SP are defined in the display area AA of the first substrate 110. The plurality of sub-pixels SP are each an individual unit configured to emit light. A light-emitting element and a driving element are formed on each of the plurality of sub-pixels SP. For example, the plurality of sub-pixels SP may include a red sub-pixel, a green sub-pixel, a blue sub-pixel, and / or a white sub-pixel. However, the present disclosure is not limited thereto. For the sake of simplicity, it is assumed below that the plurality of sub-pixels SP include the red sub-pixel, the green sub-pixel, and the blue sub-pixel. However, other variants (e.g., with a white sub-pixel) are possible and part of the present disclosure.

[0047] In the following, the display area AA of the display device 100 will be described with reference to Fig. 2 to 4 are described in more detail.

[0048] Fig. 2 is a plan view showing a part of the display area according to the embodiment of the present disclosure, and Fig. 3 is a cross-sectional view taken along the line III-III' in Fig. 2. Fig. 4 is a cross-sectional view along the line IV-IV' in Fig. 2. Meanwhile, Fig. 2, for ease of illustration, the plurality of sub-pixels SP and a transmittance adjustment layer 140 are arranged among various components of the display device 100.

[0049] First, the display area AA includes, with reference to Fig. 2 illustrates the plurality of sub-pixels SP, wherein each of the plurality of sub-pixels SP is an individual unit configured to emit light, and the light-emitting element is disposed in each of the plurality of sub-pixels SP. The plurality of sub-pixels SP includes a red sub-pixel SPR, a green sub-pixel SPG, and a blue sub-pixel SPB that emit light beams of different colors. For example, the colors of the light beams implemented by the plurality of sub-pixels SP and the configuration and arrangement of the plurality of sub-pixels SP may vary depending on the design. However, the present disclosure is not limited thereto.

[0050] With reference to Fig. 3 and Fig. 4 are the first substrate 110, a buffer layer 111, a gate insulating layer 112, a first interlayer insulating layer 113, a second interlayer insulating layer 114, a cladding layer 115, a conductive interconnect layer 116, a first planarization layer 117, a second planarization layer 118, a driving transistor DT, a light-emitting element 120, a plurality of reflective electrodes RE, a light-blocking layer LS, an auxiliary electrode LE, a connecting electrode CE, a third planarization layer 131, a connecting layer 132, an encapsulation layer 133, a bank 134, a color conversion layer 135, a first transparent layer 136, a second transparent layer 139, a plurality of color filters CFG and CFR, the transmittance adjusting layer 140, and a second substrate 150 in each of the plurality of sub-pixels SP of the display panel of the display device 100 according to the embodiment of the present disclosure.

[0051] First, the first substrate 110 may be configured to support various components of the display device 100 and may be made of an insulating material. For example, the first substrate 110 may be made of glass, resin, or the like. Furthermore, the first substrate 110 may contain plastic, such as a polymer, and be made of a flexible material.

[0052] The light-blocking layer LS is disposed in each of the plurality of sub-pixels SP on the first substrate 110. The light-blocking layer LS blocks light entering an active layer ACT of the drive transistor DT, which will be described below, from a bottom surface of the first substrate 110. The light-blocking layer LS can block light entering the active layer ACT of the drive transistor DT, thereby minimizing leakage current.

[0053] The buffer layer 111 is disposed on the first substrate 110 and the light-blocking layer LS. The buffer layer 111 can reduce the penetration of moisture or contaminants through the first substrate 110. For example, the buffer layer 111 can be formed as a single layer or a multi-layer of silicon oxide (SiOx) or silicon nitride (SiNx). However, the present disclosure is not limited thereto. However, the buffer layer 111 may be omitted depending on the type of the first substrate 110 or the type of transistor. However, the present disclosure is not limited thereto.

[0054] The drive transistor DT is arranged on the buffer layer 111. The drive transistor DT includes the active layer ACT, a gate electrode GE, a source electrode SE, and a drain electrode DE.

[0055] The active layer ACT is disposed on the buffer layer 111. The active layer ACT may be made of a semiconductor material such as an oxide semiconductor, amorphous silicon, or polysilicon. However, the present disclosure is not limited thereto.

[0056] The gate insulating layer 112 is disposed on the active layer ACT. The gate insulating layer 112 is an insulating layer for insulating the active layer ACT and the gate electrode GE. The gate insulating layer 112 may be formed as a single layer or a multi-layer of silicon oxide (SiOx) or silicon nitride (SiNx). However, the present disclosure is not limited thereto.

[0057] The gate electrode GE is arranged on the gate insulating layer 112. The gate electrode GE may be made of an electrically conductive material such as copper (Cu), aluminum (Al), molybdenum (Mo), nickel (Ni), titanium (Ti), chromium (Cr), or an alloy thereof. However, the present disclosure is not limited thereto.

[0058] The first interlayer insulating layer 113 and the second interlayer insulating layer 114 are disposed on the gate electrode GE. Contact holes are formed in the first interlayer insulating layer 113 and the second interlayer insulating layer 114, through which the source electrode SE and the drain electrode DE are connected to the active layer ACT. The first interlayer insulating layer 113 and the second interlayer insulating layer 114 may be insulating layers for protecting components disposed under the first interlayer insulating layer 113 and components disposed under the second interlayer insulating layer 114, and may each be formed as a single layer or multiple layers of silicon oxide (SiOx) or silicon nitride (SiNx). However, the present disclosure is not limited thereto.

[0059] The source electrode SE and the drain electrode DE are arranged on the second interlayer insulating layer 114 and electrically connected to the active layer ACT. The source electrode SE and the drain electrode DE may each be made of an electrically conductive material such as copper (Cu), aluminum (Al), molybdenum (Mo), nickel (Ni), titanium (Ti), chromium (Cr), or an alloy thereof. However, the present disclosure is not limited thereto.

[0060] However, in the present disclosure, the configuration in which the first interlayer insulating film 113 and the second interlayer insulating film 114, that is, the plurality of insulating films, are disposed between the gate electrode GE, the source electrode SE, and the drain electrode DE has been described. However, only a single insulating film may be disposed between the gate electrode GE, the source electrode SE, and the drain electrode DE. However, the present disclosure is not limited to this.

[0061] Furthermore, as shown in the drawings, if the plurality of insulating layers such as the first interlayer insulating layer 113 and the second interlayer insulating layer 114 are disposed between the gate electrode GE, the source electrode SE, and the drain electrode DE, an additional electrode may be formed between the first interlayer insulating layer 113 and the second interlayer insulating layer 114. The additionally formed electrode may define a capacitor together with other components disposed on the lower portion of the first interlayer insulating layer 113 or the upper portion of the second interlayer insulating layer 114.

[0062] The auxiliary electrode LE is disposed on the gate insulating layer 112. The auxiliary electrode LE is an electrode that electrically connects the light-blocking layer LS, which is disposed under the buffer layer 111, to one of the source electrode SE and the drain electrode DE on the second interlayer insulating layer 114. For example, the light-blocking layer LS may be electrically connected to one of the source electrode SE and the drain electrode DE via the auxiliary electrode LE so as not to be operated as a floating gate, thereby minimizing a change in the threshold voltage of the driving transistor DT caused by the floating light-blocking layer LS. The drawing shows that the light-blocking layer LS is connected to the source electrode SE. However, the light-blocking layer LS may be connected to the drain electrode DE. However, the present disclosure is not limited to this.

[0063] A power line VDD is disposed on the second interlayer insulating layer 114. The power line VDD, together with the drive transistor DT, may be electrically connected to the light-emitting element 120 and enable the light-emitting element 120 to emit light. The power line VDD may be made of an electrically conductive material such as copper (Cu), aluminum (Al), molybdenum (Mo), nickel (Ni), titanium (Ti), chromium (Cr), or an alloy thereof. However, the present disclosure is not limited thereto.

[0064] The overcoat layer 115 is disposed on the drive transistor DT and the power line VDD. The overcoat layer 115 may planarize an upper portion of the first substrate 110 on which the drive transistor DT is disposed. The overcoat layer 115 may be formed as a single layer or multilayer and may be made of, for example, a photoresist or an acrylic-based organic material. However, the present disclosure is not limited thereto. The plurality of reflective electrodes RE, which are spaced apart from each other, are disposed on the overcoat layer 115. The plurality of reflective electrodes RE may serve to electrically connect the light-emitting element 120 to the power line VDD and the drive transistor DT and serve as a reflective plate that reflects light emitted from the light-emitting element 120 to an upper portion of the light-emitting element 120.The plurality of reflective electrodes RE may each be made of an electrically conductive material having excellent reflectivity and reflect the light emitted from the light-emitting element 120 toward the upper portion of the light-emitting element 120.

[0065] The plurality of reflective electrodes RE include a first reflective electrode RE1 and a second reflective electrode RE2. The first reflective electrode RE1 can electrically connect the drive transistor DT and the light-emitting element 120. The first reflective electrode RE1 can be connected to the source electrode SE or the drain electrode DE of the drive transistor DT through a contact hole formed in the cladding layer 115.

[0066] The second reflective electrode RE2 may electrically connect the power line VDD and the light-emitting element 120. The second reflective electrode RE2 may be connected to the power line VDD through a contact hole formed in the cladding layer 115 and electrically connected to a second electrode 125 of the light-emitting element 120 through a second connection electrode CE2, which will be described below.

[0067] The conductive interconnect layer 116 can be disposed on the plurality of reflective electrodes RE and can fix the light-emitting element 120 disposed on the conductive interconnect layer 116. Furthermore, the conductive interconnect layer 116 can electrically connect the plurality of reflective electrodes RE and the plurality of light-emitting elements 120. In particular, the conductive interconnect layer 116 can fix and electrically connect the first reflective electrode RE1, which is disposed below the conductive interconnect layer 116, and a first electrode 124 of the light-emitting element 120, which is disposed above the conductive interconnect layer 116. The conductive interconnect layer 116 can be made of a conductive interconnect material. For example, the conductive interconnect layer 116 can be made of a eutectic interconnect material or an anisotropic conductive film (ACF) with conductive spheres.However, the present disclosure is not limited thereto.

[0068] The plurality of light-emitting elements 120 are provided on the conductive interconnect layer 116 and arranged in each of the plurality of sub-pixels SP. The plurality of light-emitting elements 120 may be elements configured to emit light using an electric current and may include the light-emitting element 120 configured to emit blue light. For example, the plurality of light-emitting elements 120 may each be a light-emitting diode (LED) or a micro-LED. However, the present disclosure is not limited thereto.

[0069] The light-emitting element 120 includes a first semiconductor layer 121, a light-emitting layer 122, a second semiconductor layer 123, the first electrode 124, and the second electrode 125.

[0070] The first semiconductor layer 121 is disposed on the conductive interconnection layer 116, and the second semiconductor layer 123 is disposed on the first semiconductor layer 121. The first semiconductor layer 121 and the second semiconductor layer 123 may each be a layer formed by doping a specific material with n-type and p-type impurities. For example, the first semiconductor layer 121 and the second semiconductor layer 123 may each be a layer formed by doping a material such as gallium nitride (GaN), indium aluminum phosphide (InAlP), or gallium arsenic (GaAs) with n-type and p-type impurities. Further, the p-type impurity may be magnesium, zinc (Zn), beryllium (Be), or the like. The n-type impurity may be silicon (Si), germanium, tin (Sn), or the like. However, the present disclosure is not limited thereto.

[0071] The light-emitting layer 122 is disposed between the first semiconductor layer 121 and the second semiconductor layer 123. The light-emitting layer 122 can emit light by receiving positive holes and electrons from the first semiconductor layer 121 and the second semiconductor layer 123.

[0072] The light-emitting layer 122 may be formed as a single layer or as a multiple quantum well (MQW) structure. For example, the light-emitting layer 122 may be made of indium gallium nitride (InGaN), gallium nitride (GaN), or the like. However, the present disclosure is not limited thereto.

[0073] The first electrode 124 is disposed between the first semiconductor layer 121 and the conductive interconnection layer 116. The first electrode 124 is an electrode that electrically connects the drive transistor DT and the first semiconductor layer 121. In this case, the first semiconductor layer 121 may be a semiconductor layer doped with n-type impurities, and the first electrode 124 may be a cathode. The first electrode 124 may be made of an electrically conductive material, such as a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO), or an opaque conductive material such as titanium (Ti), gold (Au), silver (Ag), copper (Cu), or an alloy thereof. However, the present disclosure is not limited thereto.

[0074] The second electrode 125 is disposed on the second semiconductor layer 123. The second electrode 125 may be disposed on an upper surface of the second semiconductor layer 123. The second electrode 125 is an electrode for electrically connecting the power line VDD and the second semiconductor layer 123. In this case, the second semiconductor layer 123 may be a semiconductor layer doped with p-type impurities, and the second electrode 125 may be an anode. The second electrode 125 may be made of an electrically conductive material, such as a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO), or an opaque conductive material such as titanium (Ti), gold (Au), silver (Ag), copper (Cu), or an alloy thereof. However, the present disclosure is not limited thereto.

[0075] The first planarization layer 117 and the second planarization layer 118 are disposed on the overcoat layer 115 and the plurality of reflective electrodes RE. The first planarization layer 117 and the second planarization layer 118 may be disposed to surround a portion of a side surface of each of the plurality of light-emitting elements 120 and to fix and protect each of the plurality of light-emitting elements 120.

[0076] The connection electrode CE may be arranged on the second planarization layer 118. The connection electrode CE is an electrode arranged in each of the plurality of sub-pixels SP and configured to electrically connect the light-emitting element 120 and the power line VDD. The connection electrode CE may be connected to the second reflective electrode RE2 through contact holes formed in the first planarization layer 117 and the second planarization layer 118. Therefore, the connection electrode CE may be electrically connected to the power line VDD through the second reflective electrode RE2. In particular, the connection electrode CE may be arranged on the second planarization layer 118 and connected to the second electrode 125 of the light-emitting element 120.

[0077] The third planarization layer 131 is disposed on the light-emitting element 120. The third planarization layer 131 may be a layer for planarizing an upper portion of the light-emitting element.

[0078] The first planarization layer 117, the second planarization layer 118, and the third planarization layer 131 may each be made of an organic material. For example, the first planarization layer 117, the second planarization layer 118, and the third planarization layer 131 may each be made of an acrylic-based organic material. However, the present disclosure is not limited thereto.

[0079] The bonding layer 132 is disposed on the third planarization layer 131. The bonding layer 132 is a layer for bonding the first substrate 110 and the second substrate 150. In particular, the bonding layer 132 can be used to bond the first substrate 110, which is formed into the third planarization layer 131, and the second substrate 150, which is formed into the encapsulation layer 133, as described below. The bonding layer 132 can be made of a transparent, photocurable bonding material. However, the present disclosure is not limited thereto.

[0080] The encapsulation layer 133 is arranged on the connection layer 132. The encapsulation layer 133 protects the light-emitting element 120 from physical influences, moisture, or air that may penetrate the light-emitting element 120 from the outside. The encapsulation layer 133 may comprise an inorganic layer. For example, the encapsulation layer 133 may be made of various inorganic materials such as silicon nitride (SiNx), silicon oxide (SiOx), or silicon oxynitride (SiON). However, the present disclosure is not limited thereto.

[0081] The banks 134, the plurality of color conversion layers 135 and the first transparent layer 136 are arranged on the encapsulation layer 133.

[0082] The banks 134 may be arranged between the plurality of sub-pixels SP and minimize the extent to which the light emitted from the plurality of sub-pixels SP spreads to another sub-pixel SP and causes color mixing. The banks 134 may be arranged along boundaries between the plurality of sub-pixels SP and formed in a mesh shape. For example, the bank 134 may be made of an opaque resin or the like including a black material. However, the present disclosure is not limited thereto.

[0083] The plurality of color conversion layers 135 are arranged to fill the spaces between the banks 134 in the red sub-pixel and the green sub-pixel. The plurality of color conversion layers 135 are arranged between the banks 134 in a red sub-pixel SPR and a green sub-pixel SPG among the plurality of sub-pixels SP. The plurality of color conversion layers 135 may be arranged to fill the spaces between the banks 134 on the plurality of light-emitting elements 120. The light emitted from the plurality of light-emitting elements 120 may propagate to the plurality of color conversion layers 135, and color conversion materials of the plurality of color conversion layers 135 may absorb the light and emit light at a different wavelength.The plurality of color conversion layers 135 may include a red color conversion layer and a green color conversion layer, and different color conversion materials may be included in the red color conversion layer and the green color conversion layer.

[0084] The red color conversion layer is arranged in the red sub-pixel SPR among the plurality of sub-pixels SP. The blue light emitted from the light-emitting element 120 can be converted into red light when passing through the red color conversion layer. For example, the red color conversion layer can convert light with a wavelength of about 400 nm or more and 480 nm or less into light with a wavelength of about 600 nm or more and 640 nm or less. However, the present disclosure is not limited thereto.

[0085] The green color conversion layer is arranged in the green sub-pixel SPG among the plurality of sub-pixels SP. The blue light emitted from the light-emitting element 120 can be converted into green light when passing through the green color conversion layer. For example, the green color conversion layer can convert light with a wavelength of about 400 nm or more and 480 nm or less into light with a wavelength of about 520 nm or more and 580 nm or less. However, the present disclosure is not limited to this.

[0086] The first transparent layer 136 may be disposed on the light-emitting element 120 and may also correspond to the color conversion layer 135 in a blue sub-pixel SPB among the plurality of sub-pixels SP. A side surface of the first transparent layer 136 may be adjacent to a side surface of the bank 134. Since the light emitted from the light-emitting element 120 is blue light, the color conversion layer is not disposed in the blue sub-pixel SPB. Instead, the first transparent layer 136, which transmits blue light, is disposed in the blue sub-pixel SPB so that the blue light from the light-emitting element 120 can propagate intact to the upper portion of the second substrate 150. The first transparent layer 136 may be made of a transparent resin. However, the present disclosure is not limited thereto.

[0087] The second substrate 150 is arranged on the bank 134, the color conversion layer 135, and the first transparent layer 136. The second substrate 150 is a substrate that supports various components arranged below the second substrate 150. Specifically, the second substrate 150 can support the plurality of color filters CFG and CFR, the transmittance adjustment layer 140, the plurality of color conversion layers 135, the bank 134, and the like arranged below the second substrate 150. The second substrate 150 can be made of the same material as the first substrate 110. For example, the second substrate 150 can be made of glass, resin, or the like.

[0088] The plurality of color filters CFG and CFR, the transmittance adjustment layer 140 and the second transparent layer 139 are arranged below the second substrate 150.

[0089] The plurality of color filters CFG and CFR are arranged below the second substrate 150 in the red sub-pixel and the green sub-pixel. Furthermore, the plurality of color filters CFG and CFR may be arranged to be adjacent to a side surface of a first transmittance adjustment layer 141 below the transmittance adjustment layers. A width of a cross-section of each of the plurality of color filters CFG and CFR may increase with increasing distance from the second substrate 150.

[0090] The multiple color filters CFG and CFR can filter light rays of different colors. The green color filter CFG, located in the green sub-pixel, can transmit green light while filtering out non-green light. The red color filter CFR, located in the red sub-pixel, can transmit red light while filtering out non-red light.

[0091] The second transparent layer 139 is disposed under the second substrate 150 in the blue sub-pixel. The second transparent layer 139 is disposed on the first transparent layer 136 and also corresponds to the plurality of color filters CFG and CFR. A side surface of the second transparent layer 139 may be adjacent to a side surface of the second transmittance adjustment layer 143. Since the light emitted from the light-emitting element 120 is blue light, the second transparent layer 139, which transmits blue light, is disposed in place of a color filter in the blue sub-pixel SPB, so that the blue light from the light-emitting element 120 can propagate intact to the upper portion of the second substrate 150. The second transparent layer 139 may be made of the same transparent resin as the first transparent layer 136. However, the present disclosure is not limited thereto.

[0092] The transmittance adjustment layer 140 is provided below the second substrate 150 and is arranged between the plurality of color filters CFG and CFR and the second transparent layer 139. The transmittance adjustment layer 140 includes the first transmittance adjustment layer 141 and the second transmittance adjustment layer 143.

[0093] The first transmittance adjustment layer 141 may be disposed under the second substrate 150 and configured to surround the plurality of color filters CFG and CFR. The first transmittance adjustment layer 141 may be disposed in the red sub-pixel SPR and the green sub-pixel SPG. Therefore, the first transmittance adjustment layer 141 can adjust the transmittances according to the viewing angles of the red light and the green light emitted from the red sub-pixel SPR and the green sub-pixel SPG among the plurality of sub-pixels SP.

[0094] The first transmittance adjusting layer 141 may include a first layer 141a disposed under the second substrate 150 and a second layer 141b disposed under the first layer 141a of the first transmittance adjusting layer 141.

[0095] The first layers 141a of the first transmittance adjustment layers 141 may be arranged to contact the side surfaces of the plurality of color filters CFG and CFR. An end of an upper surface of the first layer 141a of the first transmittance adjustment layer 141 may be arranged at a position corresponding to an inclination angle θ1 of 45 degrees to a center of the corresponding one of the plurality of light-emitting elements 120. For example, the end of the upper surface of the first layer 141a of the first transmittance adjustment layer 141 may be positioned in a region corresponding to the inclination angle θ1 of 45 degrees to the center of the corresponding one of the plurality of light-emitting elements 120.Furthermore, in this case, one end of a lower surface of the first layer 141a of the first transmittance adjustment layer 141 may be positioned in a range corresponding to an inclination angle θ2 of 60 degrees to the center of the corresponding one of the plurality of light-emitting elements 120. In this case, the center of each of the plurality of light-emitting elements 120 may be defined as a center of the light-emitting layer 122 that actually emits light. However, the present disclosure is not limited to this.

[0096] A width of a cross-section of the first layer 141a of the first transmittance adjusting layer 141 may decrease with increasing distance from the second substrate 150. The side surface of the first layer 141a of the first transmittance adjusting layer 141 may have a surface area corresponding to the side surfaces of the plurality of color filters CFG and CFR. The cross-section of the first layer 141a of the first transmittance adjusting layer 141 may have a trapezoidal shape. An area of ​​the lower surface of the first layer 141a of the first transmittance adjusting layer 141 may be equal to an area of ​​the upper surface of the second layer 141b of the first transmittance adjusting layer 141.

[0097] A transmittance of the first layer 141a of the first transmittance adjustment layer 141 may be 70%. The first layer 141a of the first transmittance adjustment layer 141 may be made of a semitransparent material. For example, the first layer 141a of the first transmittance adjustment layer 141 may contain polyimide, styrene, methyl methacrylate, polytetrafluoroethylene, benzocyclobutene series resin, and acrylate, or a mixture of one or more of the above-mentioned materials. However, the present disclosure is not limited thereto.

[0098] A cross-section of the second layer 141b of the first transmittance adjusting layer 141 may have a rectangular shape. The widths of the cross-sections of the upper and lower surfaces of the second layer 141b of the first transmittance adjusting layer 141 may be equal. An area of ​​the upper surface of the second layer 141b of the first transmittance adjusting layer 141 may correspond to an area of ​​the lower surface of the first layer 141a of the first transmittance adjusting layer 141. However, the present disclosure is not limited thereto. Like the first layer 141a of the first transmittance adjusting layer 141, the second layer 141b of the first transmittance adjusting layer 141 may also have a trapezoidal shape.

[0099] The second layer 141b of the first transmittance adjustment layer 141 may have a lower transmittance than the first layer 141a of the first transmittance adjustment layer 141. The second layer 141b of the first transmittance adjustment layer 141 may contain a black material that absorbs light without transmitting light. The black material may include an organic material or an inorganic material. The black material may include a carbon-based material, metal oxide (metal oxide), or the like. However, the present disclosure is not limited thereto.

[0100] The second transmittance adjustment layer 143 may be disposed under the second substrate 150 and surround the second transparent layer 139. The second transmittance adjustment layer may be disposed in the blue sub-pixel. Therefore, the second transmittance adjustment layer 143 may adjust the transmittance of the blue light emitted from the blue sub-pixel SPB among the plurality of sub-pixels SP.

[0101] The second transmittance adjusting layer 143 may include a first layer 143a disposed under the second substrate 150 and a second layer 143b disposed under the first layer 143a of the second transmittance adjusting layer 143.

[0102] The first layer 143a of the second transmittance adjustment layer 143 may be arranged to contact the side surface of the second transparent layer 139. One end of an upper surface of the first layer 143a of the second transmittance adjustment layer 143 may be arranged at a position corresponding to an inclination angle θ3 of 60 degrees to the center of the light-emitting element 120. For example, the end of the upper surface of the first layer 143a of the second transmittance adjustment layer 143 may be positioned at a position corresponding to a range corresponding to the inclination angle θ3 of 60 degrees to the center of the light-emitting element 120 of the blue sub-pixel.

[0103] A width of a cross-section of the first layer 143a of the second transmittance adjusting layer 143 may decrease with increasing distance from the second substrate 150. The side surface of the first layer 143a of the second transmittance adjusting layer 143 may have an inclined surface corresponding to the side surface of the second transparent layer 139. The cross-section of the first layer 143a of the second transmittance adjusting layer 143 may have a trapezoidal shape. An area of ​​the lower surface of the first layer 143a of the second transmittance adjusting layer 143 may be equal to an area of ​​the upper surface of the second layer 143b of the second transmittance adjusting layer 143.

[0104] A transmittance of the first layer 143a of the second transmittance adjustment layer 143 may be 70%. The first layer 143a of the second transmittance adjustment layer 143 may be made of a semitransparent material. For example, the first layer 143a of the second transmittance adjustment layer 143 may contain polyimide, styrene, methyl methacrylate, polytetrafluoroethylene, benzocyclobutene series resin, and acrylate, or a mixture of one or more of the above materials. However, the present disclosure is not limited thereto.

[0105] A cross-section of the second layer 143b of the second transmittance adjusting layer 143 may have a rectangular shape. The widths of the cross-sections of the upper and lower surfaces of the second layer 143b of the second transmittance adjusting layer 143 may be equal. An area of ​​the upper surface of the second layer 143b of the second transmittance adjusting layer 143 may be equal to an area of ​​the lower surface of the first layer 143a of the second transmittance adjusting layer 143. However, the present disclosure is not limited thereto. Like the first layer 143a of the second transmittance adjusting layer 143, the second layer 143b of the second transmittance adjusting layer 143 may also have a trapezoidal shape.

[0106] The second layer 143b of the second transmittance adjustment layer 143 may have a lower transmittance than the first layer 143a of the second transmittance adjustment layer 143. The second layer 143b of the second transmittance adjustment layer 143 may include a black material that absorbs light without transmitting light. The black material may include an organic material or an inorganic material. The black material may include a carbon-based material, metal oxide (metal oxide), or the like. However, the present disclosure is not limited thereto.

[0107] Meanwhile, the second transmittance adjustment layer 143 may contain a black material. For example, both the first layer 143a and the second layer 143b of the second transmittance adjustment layer 143 may contain a black material. In this case, the first layer 143a and the second layer 143b may be formed as a single layer or as separate layers.

[0108] A fourth planarization layer 137 is disposed below the plurality of color filters CFG and CFR, the second transparent layer 139, and the transmittance adjustment layer 140. The fourth planarization layer 137 is a layer for planarizing lower portions of the plurality of color filters CFG and CFR, a lower portion of the second transparent layer 139, and a lower portion of the transmittance adjustment layer 140. The fourth planarization layer 137 may be made of an organic material. For example, the fourth planarization layer 137 may be made of an acrylic-based organic material. However, the present disclosure is not limited thereto.

[0109] Hereinafter, an effect of the display device according to the embodiment of the present disclosure will be described with reference to Fig. 5 described.

[0110] Fig. 5 is a diagram illustrating viewing angles for respective subpixels of the display device according to a comparative example. In this case, the display device according to the comparative example refers to a case where the transmittance adjustment layer of the display device according to the embodiment of the present disclosure is not used. The diagram in Fig. Figure 5 shows a change in luminance with respect to a change in viewing angle, assuming a viewing angle in a front view is 0 degrees. In this case, the luminance value is expressed as a relative ratio, assuming a maximum luminance value is 1.0.

[0111] In the display device according to the comparative example, the light emitted from the blue light-emitting element in the green sub-pixel SPG and the red sub-pixel SPR passes through the color conversion layer and is output to the outside, while the light emitted from the blue light-emitting element in the blue sub-pixel SPB is output intact without passing through the color conversion layer. In this case, in the green sub-pixel SPG and the red sub-pixel SPR, the light emitted from the blue light-emitting element is scattered by the color conversion materials of the color conversion layer, which improves the viewing angle characteristics. However, in the blue sub-pixel SPB, the light emitted from the blue light-emitting element is output intact without passing through the color conversion layer, which may relatively deteriorate the viewing angle characteristics. Therefore, with reference to Fig. 5 In the green sub-pixel SPG and the red sub-pixel SPR, a luminance value based on the maximum luminance is approximately 85 to 90% even when the viewing angle is greater than 45 degrees. However, in the case where the viewing angle in the blue sub-pixel SPB is greater than 45 degrees, the luminance decreases rapidly, so that a luminance value based on the maximum luminance is approximately 60% if the viewing angle is 60 degrees.

[0112] As described above, the configuration in which a scattering layer and a color filter are further disposed in the blue sub-pixel SPB can be considered suitable for suppressing deterioration of the luminance viewing angle and color characteristics in the blue sub-pixel SPB. In the case where the scattering layer and the color filter are disposed in the blue sub-pixel SPB as described above, the viewing angle characteristics can be improved, but the luminous efficiency in the blue sub-pixel SPB may be greatly reduced.

[0113] Therefore, in the display device 100 according to the embodiment of the present disclosure, the transmittance adjustment layer 140 can be arranged to improve the color characteristics. Specifically, in the display device 100 according to the embodiment of the present disclosure, the first transmittance adjustment layer 141 is arranged to surround the plurality of color filters CFG and CFR in the red sub-pixel SPR and the green sub-pixel SPG among the plurality of sub-pixels SP. In this case, by allowing the light to pass through the first layer 141a of the first transmittance adjustment layer 141, the transmittance can be reduced to 70% in a viewing angle range of 45 to 60 degrees by the second layer 141b having a lower transmittance than the first layer 141a of the first transmittance adjustment layer 141, and the first layer 141a of the first transmittance adjustment layer 141.Therefore, it is possible to reduce the viewing angle deviation between the red sub-pixel, the green sub-pixel, and the blue sub-pixel. Therefore, in the display device 100 according to the embodiment of the present disclosure, the first transmittance adjustment layer 141 is disposed, which can improve the color characteristics while reducing the viewing angle deviation.

[0114] Furthermore, in the display device 100 according to the embodiment of the present disclosure, the first transparent layer 136 and the second transparent layer are arranged, which can minimize deterioration in blue light efficiency. Specifically, in the display device 100 according to the embodiment of the present disclosure, in the blue sub-pixel SPB among the plurality of sub-pixels SP, the first transparent layer 136 is arranged instead of the plurality of color conversion layers 135, and the second transparent layer 139 is arranged instead of the plurality of color filters CFR and CFG, so that the blue light emitted from the light-emitting element 120 is output intact and no light can be eliminated by the color conversion layer 135.Therefore, in the display device 100 according to the embodiment of the present disclosure, the first transparent layer 136 and the second transparent layer 139 are arranged, which can minimize deterioration of the efficiency in blue light.

[0115] Fig. 6 is an enlarged cross-sectional view showing a green subpixel and a red subpixel of a display device according to another embodiment of the present disclosure. A display device 200 in Fig. 6 is substantially identical in configuration to the display device 100 in FIG. 1, except for the plurality of color filters CFG and CFR and a first transmittance adjustment layer 241. Fig. 1 to 4. Therefore, repeated descriptions of identical components are omitted or provided briefly.

[0116] With reference to Fig. 6, in the green sub-pixel SPG and the red sub-pixel SPR among the plurality of sub-pixels SP, the first transmittance adjustment layer 241 may be disposed under the second substrate 150 and surround the plurality of color filters CFG and CFR. A portion of the first transmittance adjustment layer 241 may be disposed to overlap the plurality of color filters CFG and CFR. Therefore, a side edge of the first transmittance adjustment layer 241 may be covered by the plurality of color filters CFG and CFR.

[0117] The first transmittance adjusting layer 241 may include a first layer 241a disposed under the second substrate 150 and a second layer 241b disposed under the first layer 241a of the first transmittance adjusting layer 241.

[0118] A bottom surface and a side surface of the first layer 241a of the first transmittance adjustment layer 241 may be arranged to partially adjoin the side surfaces of the plurality of color filters CFG and CFR. An end of an upper surface of the first layer 241a of the first transmittance adjustment layer 241 may be arranged at a position corresponding to the inclination angle θ1 of 45 degrees to the center of the corresponding one of the plurality of light-emitting elements 120. For example, the end of the upper surface of the first layer 241a of the first transmittance adjustment layer 241 may be positioned in a region corresponding to the inclination angle θ1 of 45 degrees to the center of the corresponding one of the plurality of light-emitting elements 120.

[0119] A cross-section of the first layer 241a of the first transmittance adjustment layer 241 may have a trapezoidal shape. An area of ​​the lower surface of the first layer 241a of the first transmittance adjustment layer 241 may be larger than an area of ​​the upper surface of the second layer 241b of the first transmittance adjustment layer 241.

[0120] The transmittance of the first layer 241a of the first transmittance adjustment layer 241 may be 70%. The first layer 241a of the first transmittance adjustment layer 241 may be made of a semitransparent material. For example, the first layer 241a of the first transmittance adjustment layer 241 may contain polyimide, styrene, methyl methacrylate, polytetrafluoroethylene, benzocyclobutene series resin, and acrylate, or a mixture of one or more of the above materials.

[0121] The second layer 241b of the first transmittance adjusting layer 241 may be arranged so as to be close to one side of the end of the lower surface of the first layer 241a of the first transmittance adjusting layer 241. The end of the upper surface of the second layer 241b of the first transmittance adjusting layer 241 may be positioned in a range corresponding to the inclination angle θ2 of 60 degrees to the center of the corresponding one of the plurality of light-emitting elements 120.

[0122] A cross-section of the second layer 241b of the first transmittance adjusting layer 241 may have a rectangular shape. The widths of the cross-sections of the upper and lower surfaces of the second layer 241b of the first transmittance adjusting layer 241 may be the same. However, the present disclosure is not limited thereto. Like the first layer 241a of the first transmittance adjusting layer 241, the second layer 241b of the first transmittance adjusting layer 241 may also have a trapezoidal shape. The second layer 241b of the first transmittance adjusting layer 241 may have a lower transmittance than the first layer 241a of the first transmittance adjusting layer 241. The second layer 241b of the first transmittance adjusting layer 241 may include a black material that absorbs light without transmitting light. The black material may comprise an organic material or an inorganic material.The black material may include a carbon-based material, metal oxide (metal oxide), or the like. However, the present disclosure is not limited thereto.

[0123] Therefore, in the display device 200 according to another embodiment of the present disclosure, the first transmittance adjustment layer 241 is arranged to surround the plurality of color filters CFG and CFR in the red sub-pixel SPR and the green sub-pixel SPG among the plurality of sub-pixels SP. In this case, by allowing light to pass through the first layer 241a of the first transmittance adjustment layer 241 by the second layer 241b, which has a lower transmittance than the first layer 241a of the first transmittance adjustment layer 241, and the first layer 241a of the first transmittance adjustment layer 241, the transmittance can be reduced to 70% in a viewing angle range of 45 to 60 degrees. In this way, it is possible to reduce viewing angle deviations between the red sub-pixel, the green sub-pixel, and the blue sub-pixel.Accordingly, in the display device 200 according to the embodiment of the present disclosure, the first transmittance adjustment layer 241 is arranged, which can improve the color characteristics while reducing the viewing angle deviation.

[0124] Fig. 7 is an enlarged cross-sectional view showing a blue subpixel of the display device according to another embodiment of the present disclosure. The display device 200 in Fig. 7 is, with the exception of a second transparent layer 239 and a second transmittance adjustment layer 243, substantially identical in configuration to the display device 100 in Fig. 1 to 4. Therefore, repeated descriptions of identical components are omitted or provided briefly.

[0125] With reference to Fig.7, in the blue sub-pixel SPB among the plurality of sub-pixels SP, the second transmittance adjustment layer 243 may be disposed under the second substrate 150 and surround the second transparent layer 239. A part of the second transmittance adjustment layer 243 may be disposed to overlap the second transparent layer 239. Therefore, a side edge of the second transmittance adjustment layer 243 may be covered by the second transparent layer 239.

[0126] The second transmittance adjusting layer 243 may include a first layer 243a disposed under the second substrate 150 and a second layer 243b disposed under the first layer 243a of the second transmittance adjusting layer 243.

[0127] The bottom surface and side surfaces of the first layer 243a of the second transmittance adjustment layer 243 may be arranged to partially adjoin a side surface of the second transparent layer 239. The end of the upper surface of the first layer 243a of the second transmittance adjustment layer 243 may be arranged at a position corresponding to the inclination angle θ3 of 60 degrees to the center of the light-emitting element 120. For example, the end of the upper surface of the first layer 243a of the second transmittance adjustment layer 243 may be positioned at a position corresponding to a range corresponding to the inclination angle θ3 of 60 degrees to the center of the light-emitting element 120 of the blue sub-pixel.

[0128] The cross-section of the first layer 243a of the second transmittance adjustment layer 243 may have a trapezoidal shape. The surface area of ​​the lower surface of the first layer 243a of the second transmittance adjustment layer 243 may be larger than the surface area of ​​the upper surface of the second layer 243b of the second transmittance adjustment layer 243.

[0129] A transmittance of the first layer 243a of the second transmittance adjustment layer 243 may be 70%. The first layer 243a of the second transmittance adjustment layer 243 may be made of a semitransparent material. For example, the first layer 243a of the second transmittance adjustment layer 243 may contain polyimide, styrene, methyl methacrylate, polytetrafluoroethylene, benzocyclobutene series resin, and acrylate, or a mixture of one or more of the above materials. However, the present disclosure is not limited thereto.

[0130] The second layer 243b of the second transmittance adjusting layer 243 may be arranged so as to be close to one side of the end of the lower surface of the first layer 243a of the second transmittance adjusting layer 243. A cross section of the second layer 243b of the second transmittance adjusting layer 243 may have a rectangular shape. The widths of the cross sections of the upper and lower surfaces of the second layer 243b of the second transmittance adjusting layer 243 may be the same. The present disclosure is not limited to this. Like the first layer 243a of the second transmittance adjusting layer 243, the second layer 243b of the second transmittance adjusting layer 243 may also have a trapezoidal shape.

[0131] The second layer 243b of the second transmittance adjustment layer 243 may have a lower transmittance than the first layer 243a of the second transmittance adjustment layer 243. The second layer 243b of the second transmittance adjustment layer 243 may include a black material that absorbs light without transmitting light. The black material may include an organic material or an inorganic material. The black material may include a carbon-based material, metal oxide (metal oxide), or the like. However, the present disclosure is not limited thereto.

[0132] Meanwhile, the second transmittance adjustment layer 243 may contain a black material. Both the first layer 243a and the second layer 243b of the second transmittance adjustment layer 243 may contain a black material. In this case, the first layer 243a and the second layer 243b may be formed as a single layer or as separate layers.

[0133] Therefore, in the display device 200 according to another embodiment of the present disclosure, the second transmittance adjusting layer 243 is arranged to surround the second transparent layer 239 in the blue sub-pixel SPB among the plurality of sub-pixels SP. In this case, by allowing light to pass through the first layer 243a of the second transmittance adjusting layer 243 by the second layer 243b, which has a lower transmittance than the first layer 243a of the second transmittance adjusting layer 243, and the first layer 243a of the second transmittance adjusting layer 243, the transmittance at a viewing angle of 60 degrees can be reduced to 70%. Therefore, it is possible to reduce viewing angle deviations between the red sub-pixel, the green sub-pixel, and the blue sub-pixel.Therefore, in the display device 200 according to another embodiment of the present disclosure, the second transmittance adjustment layer 243 is arranged, which can improve the color characteristics while reducing the viewing angle deviation.

[0134] Furthermore, in the display device 200 according to another embodiment of the present disclosure, in the blue sub-pixel SPB among the plurality of sub-pixels SP, the first transparent layer 136 is disposed instead of the plurality of color conversion layers 135, and the second transparent layer 239 is disposed instead of the plurality of color filters CFR and CFG, so that the blue light emitted from the light-emitting element 120 is output intact and no light can be eliminated by the color conversion layer 135. Therefore, in the display device 200 according to another embodiment of the present disclosure, the first transparent layer 136 and the second transparent layer 239 are disposed, which can minimize deterioration in blue light efficiency.

[0135] The embodiments of the present disclosure may also be described as follows:

[0136] According to one aspect of the present disclosure, a display device comprises a first substrate on which a plurality of sub-pixels are defined, a plurality of blue light-emitting elements respectively disposed on the plurality of sub-pixels, a plurality of color conversion layers disposed on the plurality of blue light-emitting elements in a red sub-pixel and a green sub-pixel among the plurality of sub-pixels, a plurality of color filters disposed on the plurality of color conversion layers in the red sub-pixel and the green sub-pixel, a second substrate disposed on the plurality of color filters, and a first transmittance adjustment layer disposed under the second substrate and configured to surround the plurality of color filters, wherein the first transmittance adjustment layer comprises a first layer disposed under the second substrate and a second layer,which is arranged under the first layer of the first transmittance adjustment layer and has a lower transmittance than the first layer of the first transmittance adjustment layer.,

[0137] A width of a cross section of the first layer of the first transmittance adjustment layer may decrease with increasing distance of the cross section from the second substrate.

[0138] An area of ​​a lower surface of the first layer of the first transmittance adjusting layer may be equal to an area of ​​an upper surface of the second layer of the first transmittance adjusting layer.

[0139] An area of ​​a lower surface of the first layer of the first transmittance adjusting layer may be larger than an area of ​​an upper surface of the second layer of the first transmittance adjusting layer, and the second layer of the first transmittance adjusting layer may be arranged to be close to one side of an end of the lower surface of the first layer of the first transmittance adjusting layer.

[0140] A transmittance of the first layer of the first transmittance adjustment layer may be 70%.

[0141] An end of an upper surface of the first layer of the first transmittance adjusting layer may be positioned at a position corresponding to an inclination angle of 45 degrees to a center of the corresponding one of the plurality of blue light-emitting elements, wherein the center of the blue light-emitting element may be the center of a light-emitting layer of the blue light-emitting element, wherein the inclination angle of 45 degrees may be an inclination angle of a vertex, which is the center, formed with a normal perpendicular to the light-emitting layer through the center.

[0142] The second layer of the first transmittance adjustment layer may contain a black material.

[0143] An end of an upper surface of the second layer of the first transmittance adjusting layer may be arranged at a position corresponding to an inclination angle of 60 degrees to a center of the corresponding one of the plurality of blue light-emitting elements, wherein the center of the blue light-emitting element may be the center of a light-emitting layer of the blue light-emitting element, wherein the inclination angle of 60 degrees may be an inclination angle of a vertex, which is the center, formed with a normal perpendicular to the light-emitting layer through the center.

[0144] The display device may further comprise a first transparent layer disposed in a blue sub-pixel among the plurality of sub-pixels on the plurality of blue light-emitting elements and corresponding to the color conversion layer, and a second transparent layer disposed in the blue sub-pixel on the first transparent layer and corresponding to the plurality of color filters.

[0145] The display device may further comprise a second transmittance adjustment layer disposed under the second substrate and corresponding to the first transmittance adjustment layer and configured to surround the second transparent layer.

[0146] The second transmittance adjusting layer may include a first layer disposed under the second substrate and a second layer disposed under the first layer of the second transmittance adjusting layer, and may have a lower transmittance than the first layer of the second transmittance adjusting layer.

[0147] An end of an upper surface of the first layer of the second transmittance adjusting layer may be arranged at a position corresponding to an inclination angle of 60 degrees to a center of the corresponding one of the plurality of blue light-emitting elements, wherein the center of the blue light-emitting element may be the center of a light-emitting layer of the blue light-emitting element, wherein the inclination angle of 60 degrees may be an inclination angle of a vertex, which is the center, formed with a normal perpendicular to the light-emitting layer through the center.

[0148] A transmittance of the first layer of the second transmittance adjusting layer may be 70%, and the second layer of the second transmittance adjusting layer may contain a black material.

[0149] The second transmittance adjustment layer may contain a black material.

[0150] An area of ​​a lower surface of the first layer of the second transmittance adjusting layer may be larger than an area of ​​an upper surface of the second layer of the second transmittance adjusting layer, and the second layer of the second transmittance adjusting layer may be arranged to be close to one side of an end of the lower surface of the first layer of the second transmittance adjusting layer. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] KR 10-2024-0022497

[0001]

Claims

[1] Display device (100, 200) comprising: a first substrate (110) on which a plurality of subpixels (SP) are defined, the plurality of subpixels (SP) comprising a red subpixel (SPR) and a green subpixel (SPG); a plurality of blue light-emitting elements (120) each arranged on the plurality of sub-pixels (SP); a plurality of color conversion layers (135) arranged on the plurality of blue light-emitting elements (120) in the red sub-pixel (SPR) and in the green sub-pixel (SPG); a plurality of color filters (CFG, CFR) arranged on the plurality of color conversion layers (135) in the red sub-pixel (SPR) and in the green sub-pixel (SPG); a second substrate (150) arranged on the plurality of color filters (CFG, CFR); and a first transmittance adjustment layer (141) disposed under the second substrate (150) and configured to surround the plurality of color filters (CFG, CFR), wherein the first transmittance adjustment layer (141) comprises: a first layer (141a) disposed beneath the second substrate (150); and a second layer (141b) disposed under the first layer (141a) of the first transmittance adjusting layer (141) and having a lower transmittance than the first layer (141a) of the first transmittance adjusting layer (141). [2] The display device (100, 200) according to claim 1, wherein a width of a cross section of the first layer (141a) of the first transmittance adjusting layer (141) decreases with increasing distance of the cross section from the second substrate (150). [3] The display device (100, 200) according to claim 2, wherein an area of ​​a lower surface of the first layer (141a) of the first transmittance adjusting layer (141) is equal to an area of ​​an upper surface of the second layer (141b) of the first transmittance adjusting layer (141). [4] The display device (100, 200) according to claim 2, wherein an area of ​​a lower surface of the first layer (141a) of the first transmittance adjusting layer (141) is larger than an area of ​​an upper surface of the second layer (141b) of the first transmittance adjusting layer (141), and wherein the second layer (141b) of the first transmittance adjusting layer (141) is arranged to be close to one side of an end of the lower surface of the first layer (141a) of the first transmittance adjusting layer (141). [5] The display device (100, 200) according to any one of the preceding claims, wherein a transmittance of the first layer (141a) of the first transmittance adjustment layer (141) is 70%. [6] The display device (100, 200) according to claim 5, wherein one end of an upper surface of the first layer (141a) of the first transmittance adjusting layer (141) is positioned at a position corresponding to an inclination angle (θ1) of 45 degrees to a center of the corresponding one of the plurality of blue light-emitting elements (120), the center of the blue light-emitting element (120) is the center of a light-emitting layer (122) of the blue light-emitting element (120), and the inclination angle (θ1) of 45 degrees is an inclination angle of a vertex, which is the center point, formed with a normal passing through the center point perpendicular to the light-emitting layer (122) of the blue light-emitting element (120). [7] The display device (100, 200) according to any one of the preceding claims, wherein the second layer (141b) of the first transmittance adjusting layer (141) contains a black material. [8] The display device (100, 200) according to claim 7, wherein an end of an upper surface of the second layer (141b) of the first transmittance adjusting layer (141) is arranged at a position corresponding to an inclination angle (θ2) of 60 degrees to a center of the corresponding one of the plurality of blue light-emitting elements (120), the center of the blue light-emitting element (120) is the center of a light-emitting layer (122) of the blue light-emitting element (120), and the inclination angle (θ2) of 60 degrees is an inclination angle of a vertex, which is the center, formed with a normal perpendicular to the light-emitting layer (122) of the blue light-emitting element (120), passing through the center. [9] A display device (200) according to any one of the preceding claims, further comprising in a blue sub-pixel (SPB) among the plurality of sub-pixels (SP): a first transparent layer (136) arranged on the plurality of blue light-emitting elements (120) and corresponding to the color conversion layer (135); and a second transparent layer (239) arranged on the first transparent layer (136) and corresponding to the plurality of color filters (CFG, CFR). [10] The display device (200) of claim 9, further comprising: a second transmittance adjustment layer (243) disposed under the second substrate (150) and corresponding to the first transmittance adjustment layer (141), the second transmittance adjustment layer (243) being configured to surround the second transparent layer (239). [11] The display device (200) according to claim 10, wherein the second transmittance adjustment layer (243) comprises: a first layer (243a) disposed beneath the second substrate (150); and a second layer (243b) disposed under the first layer (243a) of the second transmittance adjusting layer (243) and having a lower transmittance than the first layer (243a) of the second transmittance adjusting layer (243). [12] The display device (200) according to claim 11, wherein an end of an upper surface of the first layer (243a) of the second transmittance adjusting layer (243) is arranged at a position corresponding to an inclination angle (θ3) of 60 degrees to a center of the corresponding one of the plurality of blue light-emitting elements (120), the center of the blue light-emitting element (120) is the center of a light-emitting layer (122) of the blue light-emitting element (120), and the inclination angle (θ3) of 60 degrees is an inclination angle of a vertex, which is the center point, formed with a normal passing through the center point perpendicular to the light-emitting layer (122) of the blue light-emitting element (120). [13] The display device (200) according to claim 11 or 12, wherein the transmittance of the first layer (243a) of the second transmittance adjusting layer (243) is 70% and / or the second layer (243b) of the second transmittance adjusting layer (243) contains a black material. [14] The display device (200) according to any one of claims 10 to 13, wherein the second transmittance adjusting layer (243) contains a black material. [15] The display device (200) according to any one of claims 11-14, wherein an area of ​​a lower surface of the first layer (243a) of the second transmittance adjusting layer (243) is larger than an area of ​​an upper surface of the second layer (243b) of the second transmittance adjusting layer (243), and wherein the second layer (243b) of the second transmittance adjusting layer (243) is arranged to be close to a side of an end of the lower surface of the first layer (243a) of the second transmittance adjusting layer (243).

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