Display device

Abstract

The invention discloses a display device. The display device comprises a plurality of display pixels. Each display pixel includes a first display unit. The first display unit includes a first light emitting element, a color conversion layer, a first filter layer, and a first optical structure. The first light-emitting element is disposed on an inner surface of a lower substrate of the display device. The color conversion layer covers the first light emitting element. The first filter layer is disposed on an inner surface of an upper substrate of the display device. The first optical structure has a refractive power. The first filter layer is located between the upper substrate and the first optical structure. The light-in surface and the light-out surface of the first filter layer are not planes.

Description

Technical Field

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

[0002] Currently, display devices on the market are equipped with a micro-lens structure in the upper plate structure to improve the forward light output. However, the filter layer process after the micro-lens process may cause the micro-lens structure to crack and discolor.

[0003] Therefore, in some display devices, the filter layer is first configured and then the microlens structure is configured. However, under such a manufacturing method, the microlens structure is configured between the filter layer and the light emitting element, resulting in a larger distance between the filter layer and the light emitting element, thereby causing the problem of a narrowed viewing angle. Summary of the invention

[0004] The invention provides a display device with a large viewing angle and good optical performance.

[0005] According to one embodiment of the present invention, a display device is provided, comprising a plurality of display pixels. Each display pixel comprises a first display unit, and the first display unit comprises a first light-emitting element, a color conversion layer, a first filter layer, and a first optical structure. The first light-emitting element is disposed on the inner surface of the lower substrate of the display device. The color conversion layer covers the first light-emitting element. The first filter layer is disposed on the inner surface of the upper substrate of the display device. The first optical structure has a refractive ability, wherein the first filter layer is located between the upper substrate and the first optical structure. The inner surface of the upper substrate faces the inner surface of the lower substrate. The light incident surface and the light exit surface of the first filter layer are not planes.

[0006] Based on the above, the display device provided by the embodiment of the present invention includes a plurality of display units. Each display unit includes an optical structure with refractive power and a filter layer, wherein the light incident surface and the light emitting surface of the filter layer are not planes. The display device provided by the embodiment of the present invention can prevent the optical structure from cracking and discoloration during the manufacturing process, and can provide a large viewing angle.

[0007] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 A schematic diagram showing a display device according to a first embodiment of the present invention.

[0009] Figure 2 A schematic diagram showing a display device according to a second embodiment of the present invention.

[0010] Figure 3 A schematic diagram showing a display device according to a third embodiment of the present invention.

[0011] Figure 4 A schematic diagram showing a display device according to a fourth embodiment of the present invention.

[0012] Figure 5 A schematic diagram showing a display device according to a fifth embodiment of the present invention.

[0013] Wherein, the reference numerals are:

[0014] 1, 2: Display unit

[0015] 10:Lower base plate

[0016] 20: Upper substrate

[0017] 30: Filling layer

[0018] 40, 401, 402: buffer layer

[0019] 50: embankment

[0020] 100, 200, 300, 400, 500: Display device

[0021] 101, 201: Optical structure

[0022] 103, 203: filter layer

[0023] 103C, 203C: Part I

[0024] 103P, 203P: Part 2

[0025] 105, 205: dielectric layer

[0026] 107: Color conversion layer

[0027] 207: Scattering layer

[0028] L1, L2: light emitting elements DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments, but is not intended to limit the present invention.

[0030] Reference Figure 1 , which shows a schematic diagram of a display device according to a first embodiment of the present invention. The display device 100 includes a lower substrate 10, an upper substrate 20, and a plurality of display pixels disposed between the inner surface of the lower substrate 10 and the inner surface of the upper substrate 20. Each display pixel includes a first display unit 1 and a second display unit 2, wherein the first display unit 1 can be used to generate red light or green light, and the second display unit 2 is used to generate blue light. Although not shown in the figure, each display pixel may also include a third display unit for generating a color light different from the first display unit 1 and the second display unit 2.

[0031] The first display unit 1 includes a first light emitting element L1, a color conversion layer 107, a first filter layer 103, a first optical structure 101, and a first dielectric layer 105. The second display unit 2 includes a second light emitting element L2, a second filter layer 203, and a second optical structure 201. It should be noted that the first display unit 1 may include only one first light emitting element L1, and the second display unit 2 may include only one second light emitting element L2, instead of the first light emitting element L1 and the second light emitting element L2. Figure 1 The architecture shown is limited.

[0032] exist Figure 1 In the lower plate structure, the first light-emitting element L1 can be, for example, an ultraviolet light-emitting diode or a blue light-emitting diode. The color conversion layer 107 covering the first light-emitting element L1 can absorb the light emitted by the first light-emitting element L1 to generate red light or green light. The color of the first filter layer 103 corresponds to the color conversion layer 107. The second light-emitting element L2 can be a blue light-emitting diode. The second display unit 2 can also include a scattering layer 207, which covers the second light-emitting element L2 to facilitate light uniformity, but is not limited to this. A dam 50 can be arranged between the color conversion layer 107 and the scattering layer 207 to avoid crosstalk between the first display unit 1 and the second display unit 2.

[0033] In the method for manufacturing a display device according to an embodiment of the present invention, a buffer layer 40 may be disposed on the inner surface of the upper substrate 20; after removing part of the buffer layer 40, a first filter layer 103 and a second filter layer 203 may be disposed on the exposed buffer layer 40; a first dielectric layer 105 and a first optical structure 101 may be disposed on the first filter layer 103 in sequence; and a second optical structure 201 may be disposed on the second filter layer 203. Figure 1 The upper plate structure shown.

[0034] It should be noted that the process of configuring the first filter layer 103 and the second filter layer 203 is usually a high-temperature process, and the process temperature may be higher than 200 degrees Celsius. However, the tolerance temperature of the first optical structure 101 and the second optical structure 201 falls below 90 degrees. Therefore, the above process sequence of first configuring the first filter layer 103 and the second filter layer 203 and then configuring the first optical structure 101 and the second optical structure 201 avoids cracking and discoloration of the first optical structure 101 and the second optical structure 201. It should also be noted that in the display device produced by the above process sequence, each filter layer and the corresponding light-emitting element will be located on the opposite side of the optical structure. In other words, the distance between the filter layer and the light-emitting element becomes larger, so there may be a problem of limited viewing angle.

[0035] Re-reference Figure 1, the first optical structure 101 and the second optical structure 201 of this embodiment have a profile like a convex lens, thereby being able to focus light and improve the forward light output of the display device 100. In addition, the curved surface of the above-mentioned convex lens profile corresponds to a 180-degree viewing angle. The first filter layer 103 and the second filter layer 203 have curved surfaces, and the curved surfaces also correspond to a 180-degree viewing angle. Accordingly, the display device 100 provided by this embodiment can greatly increase the viewing angle compared to the existing display device configured with a planar filter layer. In addition, the first filter layer 103 is adjacent to the second filter layer 203 to avoid large-angle chromatic aberration and energy loss. In summary, the display device 100 provided by this embodiment completely avoids the above-mentioned problem of limited viewing angle by setting the first filter layer 103 and the second filter layer 203 in a non-planar form, and matching the first optical structure 101 and the second optical structure 201 with a focusing function.

[0036] It should be noted that the refractive index of the first optical structure 101 is configured to be greater than the refractive index of the first dielectric layer 105, so that total reflection occurs at the interface between the two. The light reflected back to the lower plate structure can pass through the color conversion layer 107 again, thereby improving the color conversion rate and the current efficiency of the first display unit 1.

[0037] It should also be noted that the refractive index of the second optical structure 201 is configured to be greater than the refractive index of the second filter layer 203 , so that light can be collected toward the forward viewing angle at the interface between the two, thereby improving the forward light output of the display device 100 .

[0038] The display device 100 of this embodiment further includes a filling layer 30, which is disposed between the color conversion layer 107 and the first optical structure 101, and between the second light emitting element L2 and the second optical structure 201, wherein the refractive index of the filling layer 30 may be less than or equal to the refractive index of the color conversion layer 107, the refractive index of the first optical structure 101, the refractive index of the first medium layer 105, the refractive index of the second optical structure 201, and the refractive index of the scattering layer 207. Thus, total reflection can occur at the interface between the filling layer 30 and the color conversion layer 107 and the scattering layer 207, and light with a large angle can be recovered. The light returning to the color conversion layer 107 can be color-converted again. In addition, total reflection can be avoided at the interface between the upper substrate 20 and the air.

[0039] In this embodiment, the interface between the first optical structure 101 and the first dielectric layer 105 (i.e., the first surface of the first dielectric layer 105) and the interface between the first dielectric layer 105 and the first filter layer 103 (i.e., the second surface of the first dielectric layer 105) are conformal, but the present invention is not limited thereto. In addition, the refractive index of the buffer layer 40 is smaller than the refractive index of the first optical structure 101 and the refractive index of the second optical structure 201, so that the light can be collected toward the forward viewing angle. In addition, the refractive index of the buffer layer 40 is also smaller than the refractive index of the first filter layer 103 and the refractive index of the second filter layer 203.

[0040] In order to fully illustrate the various embodiments of the present invention, other embodiments of the present invention will be described below. It must be noted that the following embodiments use the component numbers and some contents of the previous embodiments, wherein the same numbers are used to represent the same or similar components, and the description of the same technical contents is omitted. For the description of the omitted parts, please refer to the previous embodiments, and the following embodiments will not be repeated.

[0041] Reference Figure 2 , which shows a schematic diagram of a display device according to a second embodiment of the present invention. The display device 200 of the second embodiment is different from the display device 100 of the first embodiment in that the interface between the first optical structure 101 and the first dielectric layer 105 (i.e., the first surface of the first dielectric layer 105) and the interface between the first dielectric layer 105 and the first filter layer 103 (i.e., the second surface of the first dielectric layer 105) are not conformal. Figure 2 The curve formed in the cross-sectional view shown has a first radius of curvature, and the second surface is Figure 2 The curve formed in the cross-sectional view shown has a second curvature radius, wherein the first curvature radius is smaller than the second curvature radius. In this way, the first optical structure 101 providing light collection function can have sufficient refractive power, and the curvature degree of the first filter layer 103 is low, and the structural stability is high.

[0042] The display device 200 is different from the display device 100 in that a second dielectric layer 205 is disposed between the second optical structure 201 and the second filter layer 203. The interface between the second optical structure 201 and the second dielectric layer 205 and the interface between the second dielectric layer 205 and the second filter layer 203 are not conformal. The second optical structure 201 providing the light collection function can have sufficient refractive power, and the curvature of the second filter layer 203 is low, and the structural stability is high.

[0043] In addition, the refractive index of the second dielectric layer 205 is configured to be greater than the refractive index of the second filter layer 203 and less than or equal to the refractive index of the second optical structure 201. Accordingly, the light can be collected toward the forward viewing angle, thereby improving the forward light output of the display device 100. In this embodiment, the refractive index of the filling layer 30 can be less than or equal to the refractive index of the color conversion layer 107, the refractive index of the first optical structure 101, the refractive index of the first dielectric layer 105, the refractive index of the second optical structure 201, the refractive index of the second dielectric layer 205, and the refractive index of the scattering layer 207. Accordingly, total reflection can occur at the interface between the filling layer 30 and the color conversion layer 107 and the scattering layer 207, and light at a large angle can be recovered. The light returning to the color conversion layer 107 can be color-converted again. In addition, total reflection can be avoided at the interface between the upper substrate 20 and the air.

[0044] Reference Figure 3 , which shows a schematic diagram of a display device according to a third embodiment of the present invention. The display device 300 of the third embodiment is different from the display device 200 of the second embodiment in that the material of the first optical structure 101 is configured to be the same as the material of the color conversion layer 107 and thus has a color conversion capability, and the material of the second optical structure 201 is configured to be the same as the material of the scattering layer 207 and thus has a light homogenizing capability. In this way, in addition to having a light-gathering capability due to its convex lens profile, the first optical structure 101 can also perform color conversion when light passes through the first optical structure 101, thereby improving the color conversion rate and the current efficiency of the first display unit 1. Moreover, in addition to having a light-gathering capability due to its convex lens profile, the second optical structure 201 can also perform light homogenization. Therefore, the color conversion layer 107 and the scattering layer 207 in the display device 300 can be thinner than the color conversion layer 107 and the scattering layer 207 in the display device 200. In other words, the display device 300 can have a smaller overall thickness than the display device 200.

[0045] Reference Figure 4 , which shows a schematic diagram of a display device according to a fourth embodiment of the present invention. The display device 400 of the fourth embodiment is different from the display device 100 of the first embodiment in that the first filter layer 103 includes a first portion 103C and a second portion 103P, the first portion 103C of the first filter layer 103 has a curved surface, and the second portion 103P of the first filter layer 103 has a flat surface; the second filter layer 203 includes a first portion 203C and a second portion 203P, the first portion 203C of the second filter layer 203 has a curved surface, and the second portion 203P of the second filter layer 203 has a flat surface.

[0046] In the method for manufacturing a display device according to an embodiment of the present invention, a first buffer layer 401 can be configured on the inner surface of the upper substrate 20; after removing a portion of the first buffer layer 401, a first portion 103C of the first filter layer 103 and a first portion 203C of the second filter layer 203 are configured on the exposed first buffer layer 401, and a second portion 103P of the first filter layer 103 and a second portion 203P of the second filter layer 203 are configured on the top surface of the first buffer layer 401, wherein the second portion 103P surrounds the first portion 103C, the second portion 203P surrounds the first portion 203C, and the second portion 103P is adjacent to the second portion 203P; a second buffer layer 402 is configured on the first filter layer 103, the second filter layer 203 and the first buffer layer 401; and after removing a portion of the second buffer layer 402, a first optical structure 101 and a second optical structure 201 are configured on the exposed second buffer layer 402. In this way, the following steps can be completed: Figure 4 The upper plate structure shown.

[0047] In this embodiment, the first portion 103C of the first filter layer 103 and the first portion 203C of the second filter layer 203 have curved surfaces, and the curved surfaces correspond to a viewing angle of at least 160 degrees. The second portion 103P of the first filter layer 103 and the second portion 203P of the second filter layer 203 have flat surfaces, have high structural stability, and can correspond to a viewing angle of at least 160 degrees to 170 degrees, thereby avoiding large-angle chromatic aberration and energy loss.

[0048] Reference Figure 5 , which shows a schematic diagram of a display device according to a fifth embodiment of the present invention. The display device 500 of the fifth embodiment is different from the display device 100 of the first embodiment in that the light incident surface and the light emitting surface of the first filter layer 103 have a stepped surface, and the light incident surface and the light emitting surface of the second filter layer 203 have a stepped surface, wherein the light incident surface refers to the surface of the filter layer facing the corresponding light emitting element, and the light emitting surface refers to the surface of the filter layer facing away from the corresponding light emitting element.

[0049] In the method for manufacturing a display device according to an embodiment of the present invention, the process of periodically configuring a buffer layer on the inner surface of the upper substrate 20, the process of removing a portion of the buffer layer, and the process of configuring a filter layer on the exposed buffer layer can be repeated to produce the following: Figure 5 The first filter layer 103 and the second filter layer 203 are shown.

[0050] because Figure 5The first filter layer 103 and the second filter layer 203 can be considered to be composed of multiple planar structures on different layers, so they can have good structural stability. In addition, compared with the display device with only a single planar filter layer in the prior art, the display device 500 of the fifth embodiment can greatly increase the viewing angle.

[0051] In summary, the display device provided by the embodiment of the present invention includes a plurality of display units. Each display unit includes an optical structure with refractive power and a filter layer, wherein the light incident surface and the light emitting surface of the filter layer are not planes. The display device provided by the embodiment of the present invention can prevent the optical structure from cracking and discoloration during the manufacturing process, and can provide a large viewing angle.

[0052] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A display device, characterized in that: The device comprises a plurality of display pixels, each of the display pixels comprises a first display unit, and the first display unit comprises: A first light emitting element is disposed on the inner surface of the lower substrate of the display device; a color conversion layer, covering the first light-emitting element; A first filter layer is disposed on the inner surface of the upper substrate of the display device; and The first optical structure has a refractive power, wherein the first filter layer is located between the upper substrate and the first optical structure. The inner surface of the upper substrate faces the inner surface of the lower substrate, and the light incident surface and the light emitting surface of the first filter layer are not planes.

2. The display device according to claim 1, wherein: It also includes a first medium layer, which is disposed between the first optical structure and the first filter layer, wherein the refractive index of the first optical structure is greater than the refractive index of the first medium layer.

3. The display device according to claim 2, wherein: The refractive index of the first medium layer is smaller than the refractive index of the first filter layer.

4. The display device according to claim 1, wherein: The first filter layer includes a first portion and a second portion, the first portion has a curved surface, and the second portion has a flat surface.

5. The display device according to claim 1, wherein: It also includes a first dielectric layer disposed between the first optical structure and the first filter layer, wherein the first dielectric layer has a first surface adjacent to the first optical structure and a second surface adjacent to the first filter layer, and the first surface and the second surface are not conformal.

6. The display device according to claim 1, wherein: It also includes a first dielectric layer disposed between the first optical structure and the first filter layer, wherein the first dielectric layer has a first surface adjacent to the first optical structure and a second surface adjacent to the first filter layer, and the first surface and the second surface are conformal.

7. The display device according to claim 1, wherein: It also includes a filling layer disposed between the color conversion layer and the first optical structure, wherein the refractive index of the filling layer is smaller than the refractive index of the color conversion layer.

8. The display device according to claim 7, characterized in that: It also includes a first medium layer, which is disposed between the first optical structure and the first filter layer, wherein the refractive index of the filling layer is smaller than the refractive index of the first medium layer.

9. The display device according to claim 1, wherein: It also includes a buffer layer, which is disposed between the first filter layer and the upper substrate, wherein the refractive index of the buffer layer is smaller than the refractive index of the first filter layer.

10. The display device according to claim 1, wherein: The material of the first optical structure is the same as that of the color conversion layer.

11. The display device according to claim 1, wherein: The light incident surface and the light emitting surface of the first filter layer have stepped surfaces.

12. The display device according to claim 1, wherein: Each of the display pixels further includes a second display unit, and the second display unit includes: A second light emitting element is disposed on the inner surface of the lower substrate; A second filter layer is disposed on the inner surface of the upper substrate; and a second optical structure disposed on the inner surface of the upper substrate and having a refractive power, wherein the second filter layer is located between the upper substrate and the second optical structure; The light incident surface and the light emitting surface of the second filter layer are not planes.

13. The display device according to claim 12, wherein: It also includes a scattering layer covering the second light emitting element, and the material of the second optical structure is the same as that of the scattering layer.

14. The display device according to claim 12, wherein: The second optical structure includes a scattering layer.

15. The display device according to claim 12, wherein: The refractive index of the second optical structure is greater than the refractive index of the second filter layer.

16. The display device according to claim 12, wherein: It also includes a second medium layer, which is disposed between the second optical structure and the second filter layer. The refractive index of the second medium layer is greater than the refractive index of the second filter layer and less than the refractive index of the second optical structure.

17. The display device according to claim 13, wherein: It also includes a filling layer, which is arranged between the scattering layer and the second optical structure, wherein the refractive index of the filling layer is less than or equal to the refractive index of the scattering layer.

18. The display device according to claim 17, wherein: It also includes a second medium layer, which is disposed between the second optical structure and the second filter layer, and the refractive index of the filling layer is less than or equal to the refractive index of the second medium layer.

19. The display device according to claim 12, wherein: The first filter layer is adjacent to the second filter layer.

20. The display device according to claim 12, wherein: The first filter layer includes a first part and a second part, the first part of the first filter layer has a curved surface, and the second part of the first filter layer has a flat surface; the second filter layer includes a first part and a second part, the first part of the second filter layer has a curved surface, and the second part of the second filter layer has a flat surface.

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