Display device

Abstract

The invention discloses a display device which comprises a circuit substrate, a first light emitting diode, a first heightening layer, a second light emitting diode, a color conversion layer, a first optical packaging layer, a retaining wall structure and an interface layer. The first light emitting diode is arranged on the circuit substrate through the first electrode. The first heightening layer is arranged on the circuit substrate. The second light emitting diode is arranged on the first heightening layer through the second electrode. The color conversion layer covers the first light emitting diode. The first optical packaging layer wraps the second light emitting diode, and the first optical packaging layer is provided with a concave surface facing the second light emitting diode. The retaining wall structure is located on the circuit substrate and covers the side surface of the color conversion layer, the side surface of the first optical packaging layer and the side surface of the first heightening layer. The interface layer is located on the first optical encapsulation layer. A height difference exists between the first light-emitting diode and the second light-emitting diode.

Description

Technical Field

[0001] The present invention relates to a display device. Background Art

[0002] Currently, the common color conversion architecture of micro light-emitting diodes (μLEDs) usually includes components such as a bank structure, a color conversion layer, and an optical encapsulation layer. The bank structure has a high optical density (OD) value and can suppress the phenomenon of color conversion light crosstalk in the color conversion architecture.

[0003] When it is necessary to improve the resolution, it is difficult for the material of the bank structure to have both a high optical density value and a high aspect ratio at the same time. Therefore, the effect of improving the resolution can be achieved by removing the bank structure of the non-color conversion sub-pixels. However, the point light source characteristics of the micro light-emitting diodes are affected by the distance and optical characteristics of the bank structure, resulting in asymmetric light emission of the non-color conversion sub-pixels, which has a significant impact on the picture quality of the display device. Summary of the Invention

[0004] The present invention provides a display device that can maintain the picture quality of the display device while improving the resolution.

[0005] The display device of the present invention includes a circuit board, a first light-emitting diode, a first pad layer, a second light-emitting diode, a color conversion layer, a first optical encapsulation layer, a bank structure, and an intermediate layer. The first light-emitting diode is disposed on the circuit board through a first electrode. The first pad layer is disposed on the circuit board. The second light-emitting diode is disposed on the first pad layer through a second electrode. The color conversion layer covers the first light-emitting diode. The first optical encapsulation layer covers the second light-emitting diode, and the first optical encapsulation layer has a concave surface facing the second light-emitting diode. The bank structure is located on the circuit board and covers the side surfaces of the color conversion layer, the side surfaces of the first optical encapsulation layer, and the side surfaces of the first pad layer. The intermediate layer is located above the first optical encapsulation layer. There is a height difference between the first light-emitting diode and the second light-emitting diode.

[0006] Based on the above, the color conversion layer of the present invention covers the first light-emitting diode. The second light-emitting diode is disposed on the first pad layer through a second electrode. The first optical encapsulation layer covers the second light-emitting diode, and the first optical encapsulation layer has a concave surface facing the second light-emitting diode. The intermediate layer is located above the first optical encapsulation layer. Thus, the display device of this embodiment can make the viewing angle distribution of the non-color conversion sub-pixels similar to that of the color conversion sub-pixels while improving the resolution, and maintain the picture quality of the display device. Description of the Drawings

[0007] Figure 1A It is a partial top view schematic diagram of a display device according to the first embodiment of the present invention.

[0008] Figure 1B is Figure 1A A cross-sectional schematic diagram of the display device along the section line A-A'.

[0009] Figure 2 is Figure 1B A relationship diagram of the viewing angle of the second light-emitting diode versus the light output ratio.

[0010] Figure 3A It is a partial top view schematic diagram of a display device according to the second embodiment of the present invention.

[0011] Figure 3B is Figure 3A A cross-sectional schematic diagram of the display device along the section line B-B'.

[0012] Figure 4A It is a partial top view schematic diagram of a display device according to the third embodiment of the present invention.

[0013] Figure 4B is Figure 4A A cross-sectional schematic diagram of the display device along the section line C-C'.

[0014] Wherein, reference numerals:

[0015] 100, 100a, 100b: Display device

[0016] 110: Circuit board

[0017] 121, 121b: First light-emitting diode

[0018] 121F, 131F, 141F: Light-emitting surface

[0019] 122, 122b: First electrode

[0020] 131: Second light-emitting diode

[0021] 132: Second electrode

[0022] 141, 141a, 141b: Third light-emitting diode

[0023] 142, 142a, 142b: Third electrode

[0024] 150, 150b: First cushion layer

[0025] 151, 161a, CCB, OC1B, OC2B: Side surface

[0026] 160a, 160b: Second cushion layer

[0027] 170: Glass substrate

[0028] A-A’, B-B’, C-C’: Section lines

[0029] BM: Light-shielding layer

[0030] C1: First color

[0031] C2: Second color

[0032] C3: Third color

[0033] CC, CC’: Color conversion layer

[0034] CF1, CF2, CF3: Color filter layer

[0035] d1, d2: Distance

[0036] D1: First direction

[0037] D2: Second direction

[0038] D3: Third direction

[0039] h1, h2, h3: Thickness

[0040] H1, H2, H3: Depth

[0041] L: Distance

[0042] L1, L2, L3, L4: Height

[0043] ML: Interfacial layer

[0044] OC1, OC1’: First optical encapsulation layer

[0045] OC2, OC2’: Second optical encapsulation layer

[0046] UF1: Concave surface

[0047] UF2: Another concave surface

[0048] WB: Retaining wall structure

[0049] WBT: Top surface Detailed implementation manners

[0050] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0051] As used herein, "about", "approximate", "substantially", or "essentially" include the stated value and the average value within an acceptable deviation range of a specific value determined by a person of ordinary skill in the art, taking into account the particular quantity of the measurement being discussed and the errors associated with the measurement (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations of the stated value, or, for example, within ±30%, ±20%, ±15%, ±10%, ±5%. Further, "about", "approximate", "substantially", or "essentially" as used herein can be selected to have a more acceptable deviation range or standard deviation depending on the nature of the measurement, the nature of the cutting, or other properties, rather than applying a single standard deviation to all properties.

[0052] In the drawings, for clarity, the thickness of layers, films, panels, regions, etc. is exaggerated. Throughout the specification, like reference numerals denote like elements. It should be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element, or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, no intervening elements are present. As used herein, "connected" can refer to physical and / or electrical connection. Further, "electrically connected" or "coupled" can mean that other elements exist between two elements.

[0053] In addition, relative terms such as "lower" or "bottom" and "upper" or "top" may be used herein to describe the relationship of one element to another element, as shown in the figures. It should be understood that relative terms are intended to encompass different orientations of the device in addition to the orientation shown in the figures. For example, if the device in one figure is flipped, an element described as being on the "lower" side of another element will be oriented on the "upper" side of the other element. Thus, the exemplary term "lower" can include both the "lower" and "upper" orientations, depending on the specific orientation of the figure. Similarly, if the device in one figure is flipped, an element described as being "beneath" or "under" another element will be oriented as being "above" the other element. Thus, the exemplary terms "above" or "below" can include both the above and below orientations.

[0054] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by a person of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and this invention, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0055] Exemplary embodiments are described herein with reference to cross-sectional views that are schematic diagrams of idealized embodiments. Therefore, variations in the shapes of the illustrations as a result of, for example, manufacturing techniques and / or tolerances can be expected. Therefore, the embodiments described herein should not be construed as limited to the specific shapes of the regions as shown herein, but rather include shape deviations, for example, caused by manufacturing. For example, a region shown or described as flat may typically have rough and / or nonlinear features. In addition, the sharp angles shown may be rounded. Therefore, the regions shown in the figures are schematic in nature, and their shapes are not intended to illustrate the precise shapes of the regions and are not intended to limit the scope of the claims.

[0056] For the convenience of explanation, only a few first LEDs 121, 121b, second LEDs 131, and third LEDs 141, 141a, 141b are shown in each figure, but the actual number can be greater and is not limited to this. Further, the display devices 100, 100a, 100b can be devices arranged in an array in the order of the first LEDs 121, 121b, second LEDs 131, and third LEDs 141, 141a, 141b shown in each figure. In addition, in order to clearly see the arrangement of the components, Figure 1A , Figure 3A and Figure 4A The glass substrate 170 , the light shielding layer BM, the interface layer ML and the color filter layers CF1 , CF2 , CF3 are omitted from illustration.

[0057] Figure 1A 1 is a partial top view schematically showing a display device according to a first embodiment of the present invention. Figure 1B yes Figure 1A A schematic cross-sectional view of a display device along the section line AA'. Figure 1A and Figure 1B The display device 100 includes a circuit substrate 110, a first light-emitting diode 121, a color conversion layer CC, and a retaining wall structure WB. The first light-emitting diode 121 is disposed on the circuit substrate 110 through a first electrode 122. The color conversion layer CC is disposed on the circuit substrate 110 and covers the first light-emitting diode 121 and the first electrode 122. The retaining wall structure WB is located on the circuit substrate 110 and covers the side CCB of the color conversion layer CC. The first light-emitting diode 121, the first electrode 122, and the color conversion layer CC, for example, form a color conversion sub-pixel.

[0058] Specifically, the first light-emitting diode 121 is, for example, a micro light-emitting diode, and the first light-emitting diode 121 can emit light of a first color C1, which is, for example, blue, but the present invention is not limited thereto. The color conversion layer CC can include phosphors, quantum dots (QDs), or wavelength conversion materials of similar properties, such as wavelength conversion materials of silicates, silicon nitrides, sulfides, quantum dots, or garnets, etc., to convert the light emitted by the first light-emitting diode 121 into light of a desired color. For example, in the present embodiment, the color conversion layer CC can be a photoresistive color conversion layer CC and can include a photoresist matrix and phosphors containing different activators respectively. The activator in the phosphor can be excited by the energy of the light of the first color C1 (for example, blue) from the first light-emitting diode 121 and released to be converted into light of a third color C3 (for example, red).

[0059] The barrier structure WB can include an organic material (such as a photoresist) and a reflective material disposed on the surface or inside of the foregoing organic material. The barrier structure WB can also include, for example, silicon dioxide, optical glue, or other suitable materials, and the present invention is not limited thereto. In addition, the height L3 of the barrier structure WB is between 1.5 times and 3 times the height L2 of the first light-emitting diode 121 and the first electrode 122. The height L3 of the barrier structure WB is, for example, about 20 micrometers to 22 micrometers, and the height L2 of the first light-emitting diode 121 and the first electrode 122 is, for example, about 9 micrometers to 10 micrometers.

[0060] When the light emitted by the first light-emitting diode 121 directly passes through the color conversion layer CC, the light emitted by the first light-emitting diode 121 may not necessarily be completely converted into light of the third color C3. When the height L3 of the barrier structure WB is between the above values, the barrier structure WB covering the side surface CCB of the color conversion layer CC can reflect the light emitted by the first light-emitting diode 121 back to the color conversion layer CC to effectively improve the light conversion efficiency and suppress the phenomenon of light crosstalk. The barrier structure WB can also improve the light extraction efficiency of the front view angle to prevent light from emitting from all angles, so that the light emission is not concentrated and the front view angle brightness is reduced.

[0061] The display device 100 of this embodiment further includes a second light-emitting diode 131, a third light-emitting diode 141, a first pad layer 150, and a first optical encapsulation layer OC1. The first pad layer 150 is disposed on the circuit substrate 110 and has a gap from the color conversion layer CC in the first direction D1 through the barrier structure WB. The second light-emitting diode 131 is disposed on the first pad layer 150 through a second electrode 132, and the third light-emitting diode 141 is disposed on the first pad layer 150 through a third electrode 142. The first optical encapsulation layer OC1 is disposed on the first pad layer 150 and simultaneously encapsulates the second light-emitting diode 131, the second electrode 132, the third light-emitting diode 141, and the third electrode 142. The barrier structure WB covers the side surface OC1B of the first optical encapsulation layer OC1 and the side surface 151 of the first pad layer 150. The second light-emitting diode 131, the second electrode 132, the third light-emitting diode 141, the third electrode 142, the first pad layer 150, and the first optical encapsulation layer OC1 form, for example, a non-color conversion sub-pixel.

[0062] Specifically, the second light-emitting diode 131 and the third light-emitting diode 141 are components with a similar structure to the first light-emitting diode 121 and are, for example, both micro light-emitting diodes. The second light-emitting diode 131 can emit light of a second color C2, which is, for example, green, and the third light-emitting diode 141 can emit light of a first color C1, which is, for example, blue, but the present invention is not limited thereto. The first pad layer 150 is, for example, a transparent, patternable photoresist made of an organic material, and the first optical encapsulation layer OC1 is, for example, a transparent encapsulation adhesive layer, but the present invention is not limited thereto. The light of the second color C2 and the first color C1 respectively emitted by the second light-emitting diode 131 and the third light-emitting diode 141 can be emitted upward (i.e., the third direction D3) through the first optical encapsulation layer OC1.

[0063] It should be specifically noted that the first light-emitting diode 121 is disposed on the circuit board 110 through the first electrode 122. The second light-emitting diode 131 is disposed on the circuit board 110 through the second electrode 132 and the first pad layer 150. The third light-emitting diode 141 is disposed on the circuit board 110 through the third electrode 142 and the first pad layer 150. In other words, there is a height difference between the first light-emitting diode 121 and the second light-emitting diode 131 and the third light-emitting diode 141, and the height difference is the thickness h1 of the first pad layer 150. The light-emitting surface 131F of the second light-emitting diode 131 and the light-emitting surface 141F of the third light-emitting diode 141 are closer to the top surface WBT of the barrier structure WB than the light-emitting surface 121F of the first light-emitting diode 121. Through the above design, the point light source emission angles of the second light-emitting diode 131 and the third light-emitting diode 141 can be enlarged, so that the viewing angles of the second light-emitting diode 131 and the third light-emitting diode 141 are relatively symmetrical, so as to reduce the problem of asymmetry of the viewing angles of non-color conversion sub-pixels.

[0064] The display device 100 of this embodiment further includes an intermediate layer ML. The intermediate layer ML is located above the first optical encapsulation layer OC1. In addition, the first optical encapsulation layer OC1 has a concave surface UF1 (i.e., the concave direction is the opposite of the third direction D3) facing the second light-emitting diode 131. The intermediate layer ML is connected to the concave surface UF1 of the first optical encapsulation layer OC1, and the perpendicular distance L (i.e., the distance L in the third direction D3) between the concave surface UF1 and the light-emitting surface 131F of the second light-emitting diode 131 is between 0.5 micrometers and 1 micrometer.

[0065] Furthermore, the refractive index of the intermediate layer ML is less than the refractive index of the first optical encapsulation layer OC1. The refractive index of the intermediate layer ML is between 0.9 and 1.3. The intermediate layer ML can be, for example, air, but the present invention is not limited thereto. The refractive index of the first optical encapsulation layer OC1 is between 1.4 and 1.8.

[0066] When the point light sources of the second light-emitting diode 131 and the third light-emitting diode 141 penetrate from the first optical encapsulation layer OC1 to the intermediate layer ML, the point light sources of the second light-emitting diode 131 and the third light-emitting diode 141 will deviate from the normal and form scattering due to the design of the different refractive indices of the intermediate layer ML and the first optical encapsulation layer OC1, and the above point light sources will also increase the scattering angle due to the increase in the concave depth H1 of the concave surface UF1. That is to say, through the design of the concave surface UF1 and the different refractive indices, the scattering angles of the point light sources of the second light-emitting diode 131 and the third light-emitting diode 141 can be increased, and the problem of asymmetry of the viewing angles of non-color conversion sub-pixels can be further reduced.

[0067] In addition, the total value of the depth H1 of the concave surface UF1 and the thickness h1 of the first cushion layer 150 is between 2 / 3 times and 4 / 3 times the height L1 of the second light-emitting diode 131 and the second electrode 132. The height L1 of the second light-emitting diode 131 is, for example, about 9 to 10 micrometers. When the total value of the depth H1 of the concave surface UF1 and the thickness h1 of the first cushion layer 150 is within the above range, the non-color conversion sub-pixel viewing angle can be relatively well symmetric, and the viewing angle distribution of the non-color conversion sub-pixel can be made similar to the viewing angle distribution of the color conversion sub-pixel. In other words, through the combination of the first cushion layer 150, the concave surface UF1, and the design with different refractive indices, the process height difference of the display device 100 can be reduced, and the point light sources of the second light-emitting diode 131 and the third light-emitting diode 141 can have a good scattering degree, thereby eliminating the problem of viewing angle asymmetry caused by the asymmetric distance between the second light-emitting diode 131 and the third light-emitting diode 141 and the barrier structure WB.

[0068] It should be added that if only the first cushion layer 150 is added to the display device 100, or only the design of combining the concave surface UF1 with different refractive indices is added to the display device 100, the manufacturing process difficulty will be increased.

[0069] Figure 2 It is a relationship diagram of the viewing angle of the second light-emitting diode in FIG. 1 versus the light output ratio. Please refer to Figure 2 , taking the second light-emitting diode 131 as an example, in the case of not having the first cushion layer 150, the concave surface UF1, and the refractive index difference design (i.e., the case where H1 + h1 = 0 μm), the light output ratio of the point light source of the second light-emitting diode 131 at each viewing angle is not symmetric. In the case of having the first cushion layer 150, the concave surface UF1, and the refractive index difference design (i.e., the cases where H1 + h1 = 3 μm and H1 + h1 = 9 μm), the light output ratio of the point light source of the second light-emitting diode 131 at each viewing angle is relatively symmetric. In addition, when the total value of the depth H1 of the concave surface UF1 and the thickness h1 of the first cushion layer 150 is between 2 / 3 times and 4 / 3 times the height L1 of the second light-emitting diode 131 and the second electrode 132 (i.e., the case where H1 + h1 = 9 μm), the light output ratio of the point light source of the second light-emitting diode 131 at each viewing angle is more symmetric. That is to say, the design of combining the first cushion layer 150, the concave surface UF1, and the refractive index difference can effectively improve the above-mentioned viewing angle asymmetry problem, thereby improving the picture quality of the display device 100.

[0070] Based on the above, the color conversion layer CC encapsulates the first light-emitting diode 121. The second light-emitting diode 131 and the third light-emitting diode 141 are respectively disposed on the first pad layer 150 through the second electrode 132 and the third electrode 142. The first optical encapsulation layer OC1 encapsulates the second light-emitting diode 131, the second electrode 132, the third light-emitting diode 141, and the third electrode 142, and the first optical encapsulation layer OC1 has a concave surface UF1. The intermediate layer ML is located above the first optical encapsulation layer OC1, and the refractive index of the intermediate layer ML is less than the refractive index of the first optical encapsulation layer OC1. The total value of the depth H1 of the concave surface UF1 and the thickness h1 of the first pad layer 150 is between 2 / 3 times and 4 / 3 times the height L1 of the second light-emitting diode 131 and the second electrode 132. Thus, the display device 100 of this embodiment can improve the resolution while making the viewing angle distribution of the non-color conversion sub-pixels similar to that of the color conversion sub-pixels, thereby maintaining the picture quality of the display device 100.

[0071] The display device 100 of this embodiment further includes color filter layers CF1, CF2, a light-shielding layer BM, and a glass substrate 170. The color filter layers CF1, CF2 and the light-shielding layer BM are located on the same layer, and the light-shielding layer BM is located between the color filter layers CF1, CF2. The color filter layer CF1 is located between the glass substrate 170 and the color conversion layer CC. The color filter layer CF2 is located between the glass substrate 170 and the intermediate layer ML. The light-shielding layer BM is located between the glass substrate 170 and the barrier structure WB. The light-shielding layer BM can be used to define the formation positions of the color filter layers CF1, CF2. For example, the light-shielding layer BM can have openings, and the color filter layers CF1, CF2 are located in the openings to improve the overall color contrast.

[0072] As Figure 1B shown, the color filter layer CF1 is located above the color conversion layer CC and is disposed corresponding to the first light-emitting diode 121. The color filter layer CF2 is located above the first optical encapsulation layer OC1 and is disposed corresponding to the second light-emitting diode 131 and the third light-emitting diode 141. The color filter layer CF1 can, for example, allow light of the third color C3 (for example, red) to pass through and block and filter light of other colors. The color filter layer CF2 can, for example, allow light of the first color C1 (for example, blue) and light of the second color C2 (for example, green) to pass through and block and filter light of other colors.

[0073] In addition, the material of the light-shielding layer BM can include black resin, blackened chromium-based materials (CrOx / CrNx / Cr), or other materials that are not easily reflective, or other suitable materials or combinations of the above materials. The present invention is not limited thereto.

[0074] It should be noted here that the following embodiments follow the component numbers and some content of the foregoing embodiments, where the same numbers are used to represent the same or similar components, and the description of the same technical content is omitted. For the description of the omitted part, reference may be made to the foregoing embodiments, and the following embodiments will not be repeated.

[0075] Figure 3A It is a partial top view schematic diagram of a display device according to a second embodiment of the present invention. Figure 3B is Figure 3A The cross-sectional schematic diagram of the display device along the section line B-B'. Please refer to Figure 3A and Figure 3B The main differences between the display device 100a and the display device 100 in this embodiment are that the installation position of the third light-emitting diode 141a is different from that of the third light-emitting diode 141, and the distance of the barrier structure WB is reduced to improve the resolution.

[0076] Specifically, the display device 100a includes a second pad layer 160a and a second optical encapsulation layer OC2. The second pad layer 160a is disposed on the circuit board 110 and has a space from the color conversion layer CC in the first direction D1 through the barrier structure WB. The third light-emitting diode 141a is disposed on the second pad layer 160a through the third electrode 142a. The first light-emitting diode 121 is located between the second light-emitting diode 131 and the third light-emitting diode 141a in the first direction D1, and there is a height difference between the first light-emitting diode 121 and the third light-emitting diode 141a, and the height difference is the thickness h3 of the second pad layer 160a.

[0077] The first optical encapsulation layer OC1 is disposed on the first pad layer 150 and covers the second light-emitting diode 131 and the second electrode 132, for example, forming a non-color conversion sub-pixel. The first optical encapsulation layer OC1 has a concave surface UF1 facing the second light-emitting diode 131. The second optical encapsulation layer OC2 is disposed on the second pad layer 160a and covers the third light-emitting diode 141a and the third electrode 142a, for example, forming another non-color conversion sub-pixel. The second optical encapsulation layer OC2 also has another concave surface UF2 facing the third light-emitting diode 141a. The second optical encapsulation layer OC2 can use the same material as the first optical encapsulation layer OC1, and the refractive index of the intermediate layer ML is less than the refractive index of the second optical encapsulation layer OC2.

[0078] Similarly, the retaining wall structure WB covers the side surface OC2B of the second optical encapsulation layer OC2 and the side surface 161a of the second pad layer 160a. An intermediate layer ML is provided on the second optical encapsulation layer OC2. The color filter layer CF3 is located between the glass substrate 170 and the intermediate layer ML, and the color filter layer CF3 is located above the second optical encapsulation layer OC2 and is disposed corresponding to the third light-emitting diode 141a. In this embodiment, for example, the color filter layer CF2 can allow light of the second color C2 (for example, green) to pass through and block and filter light of other colors, and the color filter layer CF3 can allow light of the first color C1 (for example, blue) to pass through and block and filter light of other colors.

[0079] As Figure 3A and Figure 3B shown, in the direction from left to right (i.e., the first direction D1), four elements such as the third light-emitting element 141a, the first light-emitting element 121, the second light-emitting element 131, and another first light-emitting element 121 are arranged in sequence, and the light emitted by these elements after passing through the color filter layers CF1, CF2, CF3 is, for example, arranged in the light-emitting color order of the first color C1, the third color C3, the second color C2, and the third color C3 (i.e., for example, in the order of blue light, red light, green light, and red light). In addition, in the direction from bottom to top (i.e., Figure 3A the second direction D2), it is also, for example, arranged in the above light-emitting color order. Through such a subpixel rendering configuration method, the number of retaining walls can be reduced, and the pixel density of the display device 100a can be increased.

[0080] In addition, the total value of the depth H2 of the concave surface UF1 and the thickness h2 of the first pad layer 150 in this embodiment is between 2 / 3 times and 3 / 2 times the height L1 of the second light-emitting diode 131 and the second electrode 132. The total value of the depth H3 of the other concave surface UF2 and the thickness h3 of the second pad layer 160a is between 2 / 3 times and 3 / 2 times the height L4 of the third light-emitting diode 141a and the third electrode 142a. The height L1 and the height L4 are, for example, about 9 micrometers to 10 micrometers. It should be added that since the second light-emitting diode 131 and the second electrode 132, and the third light-emitting diode 141a and the third electrode 142a are similar elements, the height L1 and the height L4 are actually similar values. In addition, since the distance of the retaining wall structure WB in this embodiment is reduced, when the sum of the depths H2, H3 and the thicknesses h2, h3 is in a higher state, the problem of narrow viewing angle effect can be preferably eliminated.

[0081] The display device 100a of this embodiment can also, through the design with the first cushion layer 150, the concave surface UF1, the second cushion layer 160a, another concave surface UF2, and different refractive indices, enable the point light sources of the second light-emitting diode 131 and the third light-emitting diode 141a to have a good scattering degree, reduce the viewing angle narrowing effect caused by the short-distance barrier structure WB, and improve the viewing angle symmetry between the non-color conversion sub-pixels and the color conversion sub-pixels.

[0082] Figure 4A It is a partial top view schematic diagram of a display device according to the third embodiment of the present invention. Figure 4B is Figure 4A The cross-sectional schematic diagram of the display device along the section line C-C'. Please refer to Figure 4A and Figure 4B In this embodiment, the relative positional relationships of the components such as the first light-emitting diode 121b, the first electrode 122b, the second light-emitting diode 131, the second electrode 132, the third light-emitting diode 141b, the third electrode 142b, the first cushion layer 150b, the second cushion layer 160b, the barrier structure WB, the first optical encapsulation layer OC1', the second optical encapsulation layer OC2', and the color conversion layer CC' are the same as those of the corresponding components in the second embodiment. Therefore, the description of the same technical content is omitted hereinafter.

[0083] Since the structure of the display device 100b in this embodiment is similar to the structure of the display device 100a, the display device 100b can also, through the design with the first cushion layer 150b, the concave surface UF1, the second cushion layer 160b, another concave surface UF2, and different refractive indices, reduce the viewing angle narrowing effect caused by the short-distance barrier structure WB and improve the viewing angle symmetry between the non-color conversion sub-pixels and the color conversion sub-pixels.

[0084] The main difference between the display device 100b and the display device 100a is that the area of the color conversion layer CC' of the display device 100b is enlarged, the areas of the first optical encapsulation layer OC1' and the second optical encapsulation layer OC2' are reduced, and the positions towards which the first light-emitting diode 121b and the first electrode 122b face are turned.

[0085] Specifically, the distance d1 between the first light-emitting diode 121b and the barrier structure WB in this embodiment is greater than the distance d2 between the second light-emitting diode 131 and the barrier structure WB. The distance d1 between the first light-emitting diode 121b and the barrier structure WB is, for example, between 1.5 times and 3 times the distance d2 between the second light-emitting diode 131 and the barrier structure WB. In other words, as Figure 4AAs shown, the area of the color conversion layer CC’ is larger than the areas of the first optical encapsulation layer OC1’ and the second optical encapsulation layer OC2’. Generally speaking, the color conversion layer CC’ (for example, the color conversion layer CC’ that converts light into red) requires a relatively high brightness, and the light-emitting area is proportional to the brightness. Therefore, by increasing the area of the color conversion layer CC’ in this embodiment, the display device 100b can increase the brightness under high-resolution conditions.

[0086] It should be added that if the distance d1 between the first light-emitting diode 121b and the barrier structure WB is too long, the light emitted by the first light-emitting diode 121b passing through the color conversion layer CC’ will be weakened, and the brightness cannot be increased instead.

[0087] In addition, the setting direction of the first light-emitting diode 121b in this embodiment is different from the setting directions of the second light-emitting diode 131 and the third light-emitting diode 141b. Specifically, the setting direction of the first light-emitting diode 121b is, for example, the first direction D1 towards the horizontal direction, and the setting directions of the second light-emitting diode 131 and the third light-emitting diode 141b are, for example, the second direction D2 perpendicular to the first direction D1. Through such a setting, the light-emitting brightness in the horizontal direction (i.e., the first direction D1) can be further increased.

[0088] In summary, the color conversion layer of the present invention covers the first light-emitting diode. The second light-emitting diode is disposed on the first pad layer through the second electrode. The first optical encapsulation layer covers the second light-emitting diode, and the first optical encapsulation layer has a concave surface facing the second light-emitting diode. The intermediate layer is located above the first optical encapsulation layer. In this way, the display device of this embodiment can, while improving the resolution, make the viewing angle distribution of the non-color conversion sub-pixels similar to that of the color conversion sub-pixels, and maintain the picture quality of the display device.

[0089] Of course, the present invention can also have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention. However, these corresponding changes and deformations should all fall within the protection scope of the appended claims of the present invention.

Claims

1. A display device, characterized in that: include: a circuit substrate; A first light emitting diode is disposed on the circuit substrate via a first electrode; A first padding layer is disposed on the circuit substrate; A second light emitting diode is disposed on the first padding layer via a second electrode; a color conversion layer covering the first light emitting diode; a first optical packaging layer, covering the second light emitting diode, the first optical packaging layer having a concave surface facing the second light emitting diode; a retaining wall structure, located on the circuit substrate and covering a side surface of the color conversion layer, a side surface of the first optical packaging layer, and a side surface of the first padding layer; and An interface layer is located on the first optical packaging layer, wherein There is a height difference between the first light emitting diode and the second light emitting diode.

2. The display device according to claim 1, wherein: The refractive index of the interface layer is smaller than the refractive index of the first optical packaging layer.

3. The display device according to claim 2, wherein: The refractive index of the first optical packaging layer is between 1.4 and 1.8, and the refractive index of the interface layer is between 0.9 and 1.

3.

4. The display device according to claim 1, wherein: The invention also comprises a third light emitting diode which is arranged on the first padding layer, and the first optical packaging layer covers the second light emitting diode and the third light emitting diode at the same time.

5. The display device according to claim 4, characterized in that The total value of the depth of the concave surface and the thickness of the first padding layer is between 2 / 3 and 4 / 3 times the height of the second light emitting diode and the second electrode.

6. The display device according to claim 1, wherein: Also includes: A second padding layer is disposed on the circuit substrate; a third light emitting diode, disposed on a second padding layer via a third electrode, wherein the first light emitting diode is located between the second light emitting diode and the third light emitting diode; a second optical packaging layer covering the third light emitting diode, wherein the second optical packaging layer has another concave surface facing the third light emitting diode; The retaining wall structure covers the side surface of the second optical packaging layer. The interface layer is located on the second optical packaging layer. There is a height difference between the first light emitting diode and the third light emitting diode.

7. The display device according to claim 6, wherein: The arrangement direction of the first light emitting diode is different from the arrangement direction of the second light emitting diode.

8. The display device according to claim 6, wherein: The distance between the first light emitting diode and the retaining wall structure is greater than the distance between the second light emitting diode and the retaining wall structure.

9. The display device according to claim 6, wherein: The total value of the depth of the concave surface and the thickness of the first cushioning layer is between 2 / 3 and 3 / 2 times the height of the second light-emitting diode and the second electrode, and the total value of the depth of the other concave surface and the thickness of the second cushioning layer is between 2 / 3 and 3 / 2 times the height of the third light-emitting diode and the third electrode.

10. The display device according to claim 1, wherein: The invention also comprises a color filter layer and a glass substrate. The color filter layer is located between the glass substrate and the interface layer.

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