Stretcherable display device

Abstract

To provide a stretchable display that can reduce or minimize the loss of resolution during expansion and contraction.SOLUTION: The present invention discloses a stretchable display. The display includes a lower substrate, a reflective layer on the lower substrate, pixels provided on the reflective layer to generate light, and a diffusion layer provided between the pixels and the reflective layer to diffuse the light into the reflective layer.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a display device, and more particularly to a stretchable display device. [Background technology]

[0002] Generally, a stretchable display device is a display device that can change the display area as needed. Recently, a stretchable display device that is easy to carry and has a changeable display area has been developed. Summary of the Invention [Problem to be solved by the invention]

[0003] SUMMARY OF THE INVENTION An object of the present invention is to provide a stretchable display device that can reduce or minimize the degradation of resolution when stretched or contracted. [Means for solving the problem]

[0004] The present invention discloses a stretchable display device, which includes a lower substrate, a reflective layer on the lower substrate, pixels provided on the reflective layer to generate light, and a diffusion layer provided between the pixels and the reflective layer to diffuse the light onto the reflective layer.

[0005] According to one example, each of the pixels may include an upper substrate and first to third light emitting diodes on the upper substrate.

[0006] The first to third light emitting diodes may be arranged in a ring shape.

[0007] The diffusion layer may include a boundary diffusion layer provided on the outside of the first to third light emitting diodes, an internal diffusion layer provided within the boundary diffusion layer, and a lens diffusion layer provided between the internal diffusion layer and the boundary diffusion layer and below the first to third light emitting diodes.

[0008] According to an example, the lens diffusion layer may include first to third sector diffusion layers aligned below the first to third light emitting diodes.

[0009] According to one example, the boundary diffusion layer may have a mesh shape.

[0010] According to one example, the internal diffusion layer may have a circular shape.

[0011] According to one example, the diffusion layer may have a semicircular or half-moon shape.

[0012] According to one example, the light emitting device may further include an insulating layer between the diffusing layer and the reflective layer.

[0013] According to one example, the diffusion layer may comprise a plurality of diffusion particles.

[0014] A stretchable display device according to one embodiment of the present invention includes a substrate, a reflective layer on the substrate, an insulating layer on the reflective layer, pixels provided on the insulating layer to generate light, and a diffusion layer provided within the insulating layer to diffuse the light to the reflective layer.

[0015] The substrate can include a stretchable substrate.

[0016] According to one example, the diffusion layer may include a boundary diffusion layer provided outside the pixel.

[0017] According to one example, the diffusion layer may further include an internal diffusion layer within the boundary diffusion layer.

[0018] According to one example, the diffusion layer may include a lens diffusion layer between the boundary diffusion layer and the inner diffusion layer.

[0019] A stretchable display device according to an embodiment of the present invention includes a substrate, a reflective layer on the substrate, pixels provided on the reflective layer, and a diffusion layer provided between the pixels and the reflective layer, wherein the diffusion layer may include first to third sector diffusion layers.

[0020] According to one example, the first to third sector diffusion layers may be arranged in a ring shape.

[0021] According to one example, each of the pixels may include first to third light emitting diodes on first to third sectors.

[0022] According to an example, the diffusion layer may further include an inner diffusion layer between the first to third sector diffusion layers.

[0023] According to an example, the diffusion layer may further include a boundary diffusion layer outside the lens diffusion layer. [Effects of the Invention]

[0024] As described above, the stretchable display device according to the concept of the present invention can reduce or minimize the degradation of resolution when the lower substrate stretches or contracts by utilizing a diffusion layer between the lower substrate and the pixels. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a plan view of an example of a stretcherable display device according to the concepts of the present invention; FIG. [Figure 2] FIG. 2 is a cross-sectional view taken along line II' in FIG. [Figure 3] 3 is a plan view showing an example of the lower wiring of FIG. 2. FIG. [Figure 4] FIG. 4 is a circuit diagram showing an example of the lower wiring and pixel of FIGS. 2 and 3. [Figure 5] FIG. 3 is a cross-sectional view showing an example of the diffusion layer of FIG. 2. [Figure 6] FIG. 3 is a cross-sectional view showing an example of the diffusion layer of FIG. 2. [Figure 7A] FIG. 7 is a cross-sectional view showing an example of the diffusion layer of FIG. 6. [Figure 7B] FIG. 7 is a cross-sectional view showing an example of the diffusion layer of FIG. 6. [Figure 8] 1 is a plan view of an example of a stretcherable display device according to the concepts of the present invention; FIG. [Figure 9] 9 is a cross-sectional view taken along line II-II' in FIG. 8. [Figure 10] 9 is a cross-sectional view taken along the line III-III' in FIG. 8. [Figure 11] 1 is a plan view of an example of a stretcherable display device according to the concepts of the present invention; FIG. [Figure 12] 1 is a plan view of an example of a stretcherable display device according to the concepts of the present invention; FIG. [Figure 13] 13 is a plan view showing an example of pixels, scan lines, and data lines in FIG. 12. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0026] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Advantages and / or features of the present invention, as well as methods for achieving the same, will become apparent from the following detailed description of the embodiments in conjunction with the accompanying drawings. However, the invention is not limited to the embodiments described herein, and may be embodied in different forms. Rather, the embodiments described herein are provided so that the disclosure will be thorough and complete, and so that the concept of the present invention will be fully conveyed to those skilled in the art. The invention is defined only by the scope of the claims. The same reference numerals refer to the same elements throughout the specification.

[0027] The terms used in this specification are intended to describe the embodiments and are not intended to limit the present invention. In this specification, the singular form includes the plural form unless otherwise specified. When used in this specification, the terms 'comprises' and / or 'comprising' do not exclude the presence or addition of one or more other components, operations, and / or elements to a referenced component, operation, and / or element. Furthermore, since this specification is based on preferred embodiments, reference numerals presented in accordance with the order of description are not necessarily limited to that order.

[0028] Furthermore, the embodiments described herein will be described with reference to cross-sectional views and / or plan views that are ideal exemplary views of the present invention. In the drawings, thicknesses of films and regions are exaggerated for efficient explanation of the technical content. Therefore, the shapes of the exemplary views may vary depending on manufacturing techniques and / or tolerances. Therefore, the embodiments of the present invention are not limited to the specific shapes shown in the drawings, but also include changes in shapes that occur depending on the manufacturing process.

[0029] Figure 1 shows an example of a stretcherable display device 100 according to the concept of the present invention. Figure 2 is a cross-sectional view taken along line II' in Figure 1.

[0030] 1 and 2, the stretchable display device 100 of the present invention may include a light emitting display (LED). Alternatively, the stretchable display device 100 may include an organic light emitting display (OLED), but the present invention is not limited thereto. According to one example, the stretchable display device 100 may include a lower substrate 10, a reflective layer 20, a diffusion layer 30, lower wiring 40, and pixels 50.

[0031] The lower substrate 10 may include an elastic or flexible substrate. For example, the lower substrate 10 may include PDMS (polydimethylsiloxane). Alternatively, the lower substrate 10 may include polyimide, although the present invention is not limited thereto.

[0032] A reflective layer 20 may be provided on the lower substrate 10. The reflective layer 20 may reflect light. For example, the reflective layer 20 may include a metal layer of silver (Ag) or aluminum (Al).

[0033] An insulating layer 12 may be provided on the reflective layer 20. The insulating layer 12 may comprise a transparent polymer such as PDMS or polyimide. Alternatively, the insulating layer 12 may comprise silicon oxide or silicon nitride, although the invention is not limited thereto.

[0034] The diffusion layer 30 may be disposed on the insulating layer 12. The diffusion layer 30 may be disposed within the insulating layer 12, although the invention is not limited thereto. According to one example, the diffusion layer 30 may comprise a downwardly convex lens diffusion layer. For example, the diffusion layer 30 may have a semicircular or half-moon shape in a vertical view.

[0035] Although not shown, the diffusion layer 30 may have a circular or rectangular shape in a plan view. The diffusion layer 30 can diffuse light from the pixel 50. The diffusion layer 30 may include silicon oxide, silicon nitride, silicon oxynitride, or quartz. The diffusion layer 30 may include a transparent or semi-transparent polymer, and the present invention is not limited thereto.

[0036] The lower interconnections 40 may be disposed on the insulating layer 12 between the diffusion layers 30. The lower interconnections 40 may connect the pixels 50. The lower interconnections 40 may provide electrical signals and power supply voltages to the pixels 50. For example, the lower interconnections 40 may include a metal such as gold (Au), silver (Ag), copper (Cu), aluminum (Al), tungsten (W), molybdenum (Mo), nickel (Ni), titanium (Ti), or tantalum (Ta). Alternatively, the lower interconnections 40 may include indium tin oxide (ITO), although the present invention is not limited thereto.

[0037] FIG. 3 shows an example of the lower wiring 40 of FIG. 3, the lower wiring 40 may have a wrinkled or meandering shape in a plan view. When the lower substrate 10 of FIG. 2 expands, the lower wiring 40 may lengthen or expand in the first direction D1 and the second direction D2. When the lower substrate 10 contracts, the lower wiring 40 may shorten or contract in the first direction D1 and the second direction D2.

[0038] According to an example, the lower wiring 40 may include scan lines 42 and data lines 44. The scan lines 42 may extend in a first direction D1. The scan lines 42 may be gate lines. The data lines 44 may extend in a second direction D2. The data lines 44 may be source lines or color signal lines.

[0039] 1 and 2, the pixels 50 may be disposed on the diffusion layer 30. The pixels 50 may be connected between the lower wirings 40. The pixels 50 may generate light.

[0040] According to one example, each of the pixels 50 may include a top substrate 52 , top wiring 54 , and a light emitting diode 56 .

[0041] The upper substrate 52 may be optionally provided on the diffusion layer 30. The upper substrate 52 may have lower elasticity or flexibility than the lower substrate 10. The upper substrate 52 may be transparent. For example, the upper substrate 52 may include polyimide.

[0042] The upper wiring 54 may be provided on the upper substrate 52. The upper wiring 54 may connect the light emitting diodes 56 on the upper substrate 52. The upper wiring 54 may include an opaque metal such as gold (Au), silver (Ag), copper (Cu), aluminum (Al), tungsten (W), molybdenum (Mo), nickel (Ni), titanium (Ti), or tantalum (Ta). Alternatively, the upper wiring 54 may include a transparent metal such as indium tin oxide (ITO), although the present invention is not limited thereto.

[0043] Light-emitting diodes 56 may be provided on the upper substrate 52. The light-emitting diodes 56 may generate red, blue, and green light. Although not shown, each of the light-emitting diodes 56 may vertically include a lower transparent electrode, a light-emitting layer on the lower transparent electrode, and an upper transparent electrode on the light-emitting layer. The lower transparent electrode may include ITO. The light-emitting layer may include a III-V semiconductor layer or an organic polymer. The light-emitting layer may generate red, blue, and green light by applying a bias current between the lower transparent electrode and the upper transparent electrode. An upper transparent electrode may be provided on the light-emitting layer. The upper transparent electrode may include ITO.

[0044] According to an example, each of the light emitting diodes 56 may include, in a plan view, a first light emitting diode 51, a second light emitting diode 53, and a third light emitting diode 55. The first light emitting diode 51 may be provided on one surface of the diffusion layer 30. The first light emitting diode 51 may generate red light. The second light emitting diode 53 may be provided on the center of the diffusion layer 30. The second light emitting diode 53 may generate green light. The third light emitting diode 55 may be provided on the other surface of the diffusion layer 30. The third light emitting diode 55 may generate blue light.

[0045] The reflective layer 20 can reflect red, green, and blue light. When the lower substrate 10 expands or contracts, the diffusion layer 30 can diffuse the red, green, and blue light to the reflective layer 20. The diffused red, green, and blue light can be reflected by the reflective layer 20.

[0046] Therefore, the stretchable display device 100 of the present invention can reduce or minimize the degradation of resolution when the lower substrate 10 stretches or contracts by using the diffusion layer 30 between the lower substrate 10 and the pixels 50.

[0047] FIG. 4 shows an example of the underlying wiring 40 and pixel 50 of FIGS. Referring to FIG. 4, the lower wiring 40 may further include a power wiring 46 , and the pixel 50 may further include a first thin film transistor 57 , a second thin film transistor 58 , and a first capacitor 59 .

[0048] The power supply wiring 46 may be parallel to the data wiring 44. The power supply wiring 46 may provide a power supply voltage to the light emitting diode 56.

[0049] The first thin film transistor 57 may be connected to the scan line 42 and the data line 44. The first thin film transistor 57 may be a switching transistor. The first thin film transistor 57 may control a turn-on signal of a power supply voltage. The first thin film transistor 57 may have a gate electrode connected to the scan line 42 and a source electrode connected to the data line 44. The first thin film transistor 57 may have a drain electrode connected to the gate electrode of the second thin film transistor 58.

[0050] The second thin film transistor 58 may be connected to the power supply line 46, the first thin film transistor 57, and the light emitting diode 56. The second thin film transistor 58 may control the power supply voltage. The second thin film transistor 58 may have a source electrode connected to the power supply line 46, a gate electrode connected to the first thin film transistor 57, and a drain electrode connected to the light emitting diode 56.

[0051] The first capacitor 59 may be provided between the gate of the second thin film transistor 58 and the power supply line 46. One end of the first capacitor 59 may be connected between the drain of the first thin film transistor 57 and the gate of the second thin film transistor 58, and the other end of the first capacitor 59 may be connected between the power supply line 46 and the source of the second thin film transistor 58. The first capacitor 59 may adjust the light emitting time of the light emitting diode 56.

[0052] FIG. 5 shows an example of the diffusion layer 30 of FIG. 5, the diffusion layer 30 may have a plurality of protrusions below the upper substrate 52 of the pixel 50. The plurality of protrusions may be provided below the light emitting diode 51, the second light emitting diode 53, and the third light emitting diode 55, respectively.

[0053] FIG. 6 shows an example of the diffusion layer 30 of FIG. 6, the diffusion layer 30 can be provided between the reflective layer 20 and the pixel 50 without the insulating layer 12 of FIG. 2. The diffusion layer 30 can be provided between the reflective layer 20 and the lower line 40. The diffusion layer 30 can be flat.

[0054] 7A and 7B show an example of the diffusion layer 30 of FIG. 7A and 7B, the diffusion layer 30 may have a plurality of diffusion particles 39. The diffusion particles 39 may be disposed within the diffusion layer 30. When the diffusion layer 30 extends in the first direction D1 or the second direction D2, the distance between the diffusion particles 39 may decrease. The diffusion particles 39 may have a refractive index higher than that of the diffusion layer 30. For example, the diffusion particles 39 may include a transparent polymer.

[0055] Figure 8 shows an example of a stretcherable display device 100 according to the concept of the present invention. Figures 9 and 10 are cross-sectional views taken along lines II-II' and III-III' in Figure 8, respectively.

[0056] 8 to 10, the light-emitting diodes 56 of the stretchable display device 100 of the present invention can be arranged in a ring shape. The diffusion layer 30 can be provided on the outside and inside of the light-emitting diodes 56 in a plan view. The diffusion layer 30 can overlap the light-emitting diodes 56.

[0057] Referring to FIG. 9, the diffusion layer 30 may include a boundary diffusion layer 32, a lens diffusion layer , and an internal diffusion layer .

[0058] The boundary diffusion layer 32 can be provided outside the light-emitting diode 56. The boundary diffusion layer 32 can surround the outside of the pixel 50. That is, the boundary diffusion layer 32 can be provided at the boundary of the pixel 50. The boundary diffusion layer 32 can have a mesh shape in plan view as shown in FIG. 8. The boundary diffusion layer 32 can diffuse light outside the light-emitting diode 56.

[0059] The internal diffusion layer 36 can be provided between the light emitting diodes 56. The internal diffusion layer 36 can be provided within the light emitting diode 56. The internal diffusion layer 36 can have a circular shape in a plan view. The internal diffusion layer 36 can diffuse light between the light emitting diodes 56.

[0060] The lens diffusion layer 34 may be provided between the internal diffusion layer 36 and the boundary diffusion layer 32. The lens diffusion layer 34 may be provided below the light emitting diode 56. The lens diffusion layer 34 may diffuse the light below the light emitting diode 56.

[0061] Referring to FIG. 10, the lens diffusion layer 34 may include a first sector diffusion layer 31, a second sector diffusion layer 33, and a third sector diffusion layer 35. The first sector diffusion layer 31 can be disposed under the first light emitting diode 51. The first sector diffusion layer 31 can diffuse the red light of the first light emitting diode 51. The second sector diffusion layer 33 can be disposed in a lateral direction of the first sector diffusion layer 31. The second sector diffusion layer 33 can be disposed below the second light emitting diode 53. The second sector diffusion layer 33 can diffuse the green light of the second light emitting diode 53. The third sector diffusion layer 35 can be disposed in a lateral direction of the second sector diffusion layer 33. The third sector diffusion layer 35 can be disposed below the third light emitting diode 55. The third sector diffusion layer 35 can diffuse the blue light of the third light emitting diode 55.

[0062] FIG. 11 shows an example of a stretcherable display device 100 in accordance with the concepts of the present invention. 11, the light emitting diodes 56 of the stretchable display device 100 of the present invention may be arranged in a circular shape. The first light emitting diode 51, the second light emitting diode 53, and the third light emitting diode 55 may each have a sector shape. The first light emitting diode 51, the second light emitting diode 53, and the third light emitting diode 55 may be arranged sequentially in the azimuth direction.

[0063] FIG. 12 shows an example of a stretcherable display device 100 in accordance with the concepts of the present invention. 12, the light emitting diodes 56 of the stretchable display device 100 of the present invention may be arranged in a square shape. The first light emitting diode 51, the second light emitting diode 53, and the third light emitting diode 55 may be arranged sequentially in the azimuthal direction. The first light emitting diode 51 and the second light emitting diode 53 may be trapezoidal in shape. The third light emitting diode 55 may be pentagonal in shape.

[0064] FIG. 13 shows an example of the pixel 50, scan line 42, and data line 44 of FIG. 13, the upper substrate 52 of the pixel 50 may be connected to one scan line 42 in a first direction D1 and three data lines 44 in a second direction D2. The scan line 42 and the data line 44 may have a meandering shape in a plan view. The scan line 42 and the data line 44 may be expandable and contractible in the first direction D1 and the second direction D2, respectively.

[0065] Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art will understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential features thereof. Therefore, it should be understood that the above-described embodiments are illustrative in all respects and are not limiting. [Explanation of symbols]

[0066] 10 Lower board 12 Insulating layer 20 reflective layer 30 Diffusion Layer 40 Lower wiring 50 pixels 52 Upper board 54 Upper wiring 56 Light-emitting diode

Claims

1. A lower substrate; a reflective layer on the lower substrate; pixels disposed on the reflective layer to generate light; a diffusion layer provided between the pixel and the reflective layer to diffuse the light to the reflective layer; The diffusion layer has a semicircular or semimoon shape. Stretcherable display device.

2. Each of the pixels is an upper substrate; 2. The stretchable display device of claim 1, further comprising: first, second, third light emitting diodes on the upper substrate.

3. 3. The stretchable display device according to claim 2, wherein the first, second and third light emitting diodes are arranged in a ring shape.

4. The diffusion layer is a boundary diffusion layer provided on the outer side of the first to third light emitting diodes; an internal diffusion layer provided within the boundary diffusion layer; 4. The stretchable display device according to claim 3, further comprising: a lens diffusion layer disposed between the internal diffusion layer and the boundary diffusion layer and disposed below the first, second, and third light emitting diodes.

5. 5. The stretchable display device of claim 4, wherein the lens diffusion layer includes first to third sector diffusion layers disposed below the first to third light emitting diodes.

6. The stretchable display device according to claim 4 , wherein the boundary diffusion layer has a mesh shape.

7. The stretchable display device according to claim 4 , wherein the inner diffusion layer has a circular shape.

8. 10. The stretchable display device according to claim 1, further comprising an insulating layer between the diffusing layer and the reflective layer.

9. 10. The stretchable display device according to claim 1, wherein the diffusion layer comprises a plurality of diffusion particles.

10. A substrate; a reflective layer on the substrate; an insulating layer on the reflective layer; a pixel disposed on the insulating layer and configured to generate light; a diffusion layer disposed within the insulating layer for diffusing the light to the reflective layer.

11. The stretchable display device of claim 10 , wherein the substrate comprises a stretchable substrate.

12. The stretchable display device according to claim 10 , wherein the diffusion layer includes a boundary diffusion layer provided outside the pixel.

13. The stretchable display device according to claim 12 , wherein the diffusion layer further comprises an inner diffusion layer within the boundary diffusion layer.

14. The stretchable display device of claim 13 , wherein the diffusion layer comprises a lens diffusion layer between the boundary diffusion layer and the inner diffusion layer.

15. A substrate; a reflective layer on the substrate; a pixel disposed on the reflective layer; a diffusing layer disposed between the pixel and the reflective layer; the diffusion layer includes first to third sector diffusion layers, the first to third sector diffusion layers are arranged in a ring shape; Stretcherable display device.

16. 16. The stretchable display device of claim 15, wherein each of the pixels includes first to third light emitting diodes on first to third sectors.

17. 16. The stretchable display device of claim 15, wherein the diffusion layer further comprises an inner diffusion layer between the first to third sector diffusion layers.

18. The stretchable display device of claim 15, wherein the diffusion layer further comprises boundary diffusion layers disposed outside the first, second, and third sector diffusion layers.

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