Extensible display device

Abstract

The invention provides a stretchable display device. A stretchable display device according to an embodiment of the inventive concept includes a lower substrate, a reflective layer on the lower substrate, a pixel disposed on the reflective layer to generate light, and a diffusion layer disposed between the pixel and the reflective layer and diffusing the light onto the reflective layer.

Description

Technical Field

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

[0002] Generally, a stretchable display device is a display device that changes and uses a display area according to demand. Recently, a stretchable display device that is easy to carry and has a changeable display area has been developed. Summary of the invention

[0003] The present disclosure provides a stretchable display device capable of reducing or minimizing a reduction in resolution when being stretched.

[0004] An embodiment of the inventive concept provides a stretchable display device. The stretchable display device according to an embodiment of the inventive concept includes a lower substrate, a reflective layer, a pixel, and a diffusion layer, wherein the reflective layer is on the lower substrate, the pixel is disposed on the reflective layer and generates light, and the diffusion layer is disposed between the pixel and the reflective layer and diffuses the light onto the reflective layer.

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

[0006] In an embodiment, the first to third light emitting diodes may be arranged in a ring shape.

[0007] In an embodiment, the diffusion layer may include a boundary diffusion layer, an internal diffusion layer, and a lens diffusion layer, wherein the boundary diffusion layer is disposed outside the first to third light-emitting diodes, the internal diffusion layer is disposed inside the boundary diffusion layer, and the lens diffusion layer is disposed between the internal diffusion layer and the boundary diffusion layer and disposed under each of the first to third light-emitting diodes. In an embodiment, the lens diffusion layer may include first to third fan-shaped diffusion layers, which are aligned under the first to third light-emitting diodes, respectively.

[0008] In an embodiment, the boundary diffusion layer may have a grid shape.

[0009] In an embodiment, the inner diffusion layer may have a circular shape.

[0010] In an embodiment, the diffusion layer may have a semicircular or half-moon shape.

[0011] In an embodiment, the stretchable display device may further include an insulating layer, wherein the insulating layer is between the diffusion layer and the reflection layer.

[0012] In an embodiment, the diffusion layer may have a plurality of diffusion particles.

[0013] In an embodiment of the present invention, a stretchable display device includes a substrate, a reflective layer, an insulating layer, pixels, and a diffusion layer, wherein the reflective layer is on the substrate, the insulating layer is on the reflective layer, the pixels are arranged on the insulating layer and generate light, and the diffusion layer is arranged in the insulating layer and diffuses the light to the reflective layer.

[0014] In an embodiment, the substrate may include a stretchable substrate.

[0015] In an embodiment, the diffusion layer may include a boundary diffusion layer, wherein the boundary diffusion layer is disposed outside the pixel.

[0016] In an embodiment, the diffusion layer may further include an inner diffusion layer, wherein the inner diffusion layer is disposed inside the boundary diffusion layer.

[0017] In an embodiment, the diffusion layer may further include a lens diffusion layer, wherein the lens diffusion layer is disposed between the boundary diffusion layer and the internal diffusion layer.

[0018] In an embodiment of the present invention, a stretchable display device includes a substrate, a reflective layer, a pixel, and a diffusion layer, wherein the reflective layer is on the substrate, the pixel is arranged on the reflective layer, and the diffusion layer is arranged between the pixel and the reflective layer. Here, the diffusion layer may include a first fan-shaped diffusion layer to a third fan-shaped diffusion layer.

[0019] In an embodiment, the first to third sector-shaped diffusion layers may be arranged in a ring shape.

[0020] In an embodiment, each of the pixels may include first to third light emitting diodes on first to third fan-shaped diffusion layers.

[0021] In an embodiment, the diffusion layer may further include an inner diffusion layer, wherein the inner diffusion layer is between the first sector-shaped diffusion layer to the third sector-shaped diffusion layer.

[0022] In an embodiment, the diffusion layer may further include a boundary diffusion layer, wherein the boundary diffusion layer is outside the first to third sector-shaped diffusion layers. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are included to provide a further understanding of the inventive concept and are incorporated into and constitute a part of this specification. The accompanying drawings illustrate embodiments of the inventive concept and together with the description are used to explain the principles of the inventive concept. In the accompanying drawings: Figure 1 is a plan view showing one example of a stretchable display device according to an embodiment of the inventive concept; Figure 2 is shown along Figure 1 A cross-sectional view taken along line II' in FIG. Figure 3 It is shown Figure 2 A floor plan of an example of the lower line in; Figure 4 It is shown Figure 2 and Figure 3 A circuit diagram of an example of lower lines and pixels in FIG. Figure 5 It is shown Figure 2 A cross-sectional view of an example of a diffusion layer in FIG. Figure 6 It is shown Figure 2 A cross-sectional view of an example of a diffusion layer in FIG. Fig. 7A and Figure 7B It is shown Figure 6 A cross-sectional view of an example of a diffusion layer in FIG. Figure 8 is a plan view showing one example of a stretchable display device according to an embodiment of the inventive concept; Fig. 9 and Fig.10 are shown along Figure 8 A cross-sectional view taken along lines II-II' and III-III'; Fig.11 is a plan view showing one example of a stretchable display device according to an embodiment of the inventive concept; Fig.12 is a plan view showing one example of a stretchable display device according to an embodiment of the inventive concept; Fig.13 It is shown Fig.12 A plan view of an example of pixels, scan lines, and data lines in FIG. DETAILED DESCRIPTION

[0024] Hereinafter, embodiments of the inventive concept will be described in detail with reference to the accompanying drawings. Advantages and features of the present invention, as well as methods for implementing the same will be described by the following embodiments described in detail with reference to the accompanying drawings. However, the inventive concept can be embodied in different forms and should not be construed as being limited to the embodiments described herein. On the contrary, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art. In addition, the present invention is limited only by the scope of the claims. The same reference numerals always refer to the same elements.

[0025] The terms used herein are only used for the purpose of describing the embodiments and are not intended to limit the present invention. As used herein, the singular form is also intended to include the plural form, unless the context clearly states otherwise. It will be further understood that when the terms "include" and / or "comprise" are used in this specification, they specify the existence of the stated parts, operations and / or elements, but do not exclude the existence or addition of one or more other parts, operations and / or elements. Since preferred embodiments are provided below, the order of the figure numerals given in the description is not necessarily limited thereto.

[0026] In addition, the embodiments herein will be described with reference to cross-sectional views and / or plan views as ideal exemplary views of the present invention. In the accompanying drawings, the thickness of layers and regions is exaggerated in order to effectively describe the technical content. Therefore, the shape of the exemplary views may be modified according to manufacturing technology and / or allowable errors. Therefore, the embodiments of the present invention are not limited to the specific shapes shown in the views, but may include other shapes created according to the manufacturing process.

[0027] Figure 1 One example of a stretchable display device 100 according to an embodiment of the inventive concept is shown. Figure 2 Shown along Figure 1 A view taken along line II' in FIG.

[0028] Reference Figure 1 and Figure 2 , the stretchable display device 100 according to an embodiment of the inventive concept may include a light emitting display (LED). Optionally, the stretchable display device 100 may include an organic light emitting display (OLED), and the embodiments of the inventive concept are not limited thereto. According to an embodiment, the stretchable display device 100 may include a lower substrate 10, a reflective layer 20, a diffusion layer 30, a lower line 40, and a pixel 50.

[0029] The lower substrate 10 may include an elastic substrate or a flexible substrate. For example, the lower substrate 10 may include polydimethylsiloxane (PDMS). Alternatively, the lower substrate 10 may include polyimide, and embodiments of the inventive concept are not limited thereto.

[0030] The reflective layer 20 may be disposed on the lower substrate 10. The reflective layer 20 may reflect light. For example, the reflective layer 20 may include a metal layer made of silver (Ag) or aluminum (Al).

[0031] The insulating layer 12 may be disposed on the reflective layer 20. The insulating layer 12 may include a transparent polymer of PDMS or polyimide. Alternatively, the insulating layer 12 may include silicon oxide or silicon nitride, and the embodiments of the inventive concept are not limited thereto.

[0032] The diffusion layer 30 may be disposed on the insulating layer 12. The diffusion layer 30 may be disposed in the insulating layer 12, and embodiments of the inventive concept are not limited thereto. According to an embodiment, the diffusion layer 30 may include a lens diffusion layer, wherein the lens diffusion layer is convex downward. For example, the diffusion layer 30 may have a semicircular or half-moon shape in a vertical view.

[0033] Although not shown, the diffusion layer 30 may have a circular or rectangular shape in a plan view. The diffusion layer 30 may diffuse light of 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 translucent polymer, and embodiments of the inventive concept are not limited thereto.

[0034] The down line 40 may be disposed on the insulating layer 12 between the diffusion layers 30. The down line 40 may connect the pixels 50 to each other. The down line 40 may provide an electrical signal and a power supply voltage to the pixel 50. For example, the down line 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 down line 40 may include indium tin oxide (ITO), and embodiments of the inventive concept are not limited thereto.

[0035] Figure 3 Shows Figure 2 An example of downline 40 in .

[0036] Reference Figure 3 , the lower wires 40 may each have a corrugated shape or a meandering shape in a plan view. Figure 2 When the lower substrate 10 is stretched, the lower wire 40 may be elongated or expanded in the first direction D1 and the second direction D2. When the lower substrate 10 is contracted, the lower wire 40 may be shortened or contracted in the first direction D1 and the second direction D2.

[0037] According to an embodiment, the lower line 40 may include a scan line 42 and a data line 44. The scan line 42 may extend in the first direction D1. The scan line 42 may be a gate line. The data line 44 may extend in the second direction D2. The data line 44 may be a source line or a color signal line.

[0038] Refer again Figure 1 and Figure 2 , the pixel 50 may be disposed on the diffusion layer 30. The pixel 50 may be connected between the lower lines 40. The pixel 50 may generate light.

[0039] According to an embodiment, each of the pixels 50 may include an upper substrate 52 , an upper line 54 , and a light emitting diode 56 .

[0040] The upper substrate 52 may be selectively disposed on the diffusion layer 30. The upper substrate 52 may have a lower elasticity or flexibility than that of the lower substrate 10. The upper substrate 52 may be transparent. For example, the upper substrate 52 may include polyimide.

[0041] The upper wire 54 may be disposed on the upper substrate 52. The upper wire 54 may connect the light emitting diodes 56 on the upper substrate 52 to each other. The upper wire 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 wire 54 may include indium tin oxide (ITO) or a transparent metal, and embodiments of the inventive concept are not limited thereto.

[0042] The light emitting diode 56 may be disposed on the upper substrate 52. The light emitting diode 56 may generate light having red, blue and green colors. Although not shown, in a vertical view, each light emitting diode 56 may 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 light having red, blue and green colors by a bias current between the lower transparent electrode and the upper transparent electrode. The upper transparent electrode may be disposed on the light emitting layer. The upper transparent electrode may include ITO.

[0043] According to an embodiment, in a plan view, each light emitting diode 56 may include 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 disposed on one side of the diffusion layer 30. The first light emitting diode 51 may generate red light. The second light emitting diode 53 may be disposed on a central portion of the diffusion layer 30. The second light emitting diode 53 may generate green light. The third light emitting diode 55 may be disposed on the other side of the diffusion layer 30. The third light emitting diode 55 may generate blue light.

[0044] The reflective layer 20 may reflect red light, green light, and blue light. When the lower substrate 10 is stretched, the diffusion layer 30 may diffuse the red light, green light, and blue light onto the reflective layer 20. The diffused red light, green light, and blue light may be reflected by the reflective layer 20.

[0045] Therefore, the stretchable display device 100 according to an embodiment of the inventive concept may reduce or minimize a reduction in resolution using the diffusion layer 30 between the lower substrate 10 and the pixel 50 when the lower substrate 10 is stretched.

[0046] Figure 4 Shows Figure 2 and Figure 3 An example of a lower line 40 and a pixel 50 in FIG.

[0047] Reference Figure 4The lower line 40 may further include a power supply line 46 , and the pixels 50 may further each include a first thin film transistor 57 , a second thin film transistor 58 , and a first capacitor 59 .

[0048] The power line 46 may be parallel to the data line 44. The power line 46 may supply 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 switch transistor. The first thin film transistor 57 may control the on signal of the power supply voltage. The first thin film transistor 57 may have a gate and a source, wherein the gate is connected to the scan line 42 and the source is connected to the data line 44. The first thin film transistor 57 may have a drain, wherein the drain is connected to the gate of the second thin film transistor 58.

[0050] The second thin film transistor 58 may be connected to the power 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, a gate, and a drain, wherein the source is connected to the power line 46, the gate is connected to the first thin film transistor 57, and the drain is 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 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 line 46 and the source of the second thin film transistor 58. The first capacitor 59 may adjust the light emission time of the light emitting diode 56.

[0052] Figure 5 Shows Figure 2 An example of the diffusion layer 30 in FIG.

[0053] Reference Figure 5 , the diffusion layer 30 may have a plurality of convex portions on the lower side of the upper substrate 52 of the pixel 50. The plurality of convex portions may be disposed under the first light emitting diode 51, the second light emitting diode 53, and the third light emitting diode 55, respectively.

[0054] Figure 6 Shows Figure 2 An example of the diffusion layer 30 in FIG.

[0055] Reference Figure 6 , the diffusion layer 30 may be disposed between the reflective layer 20 and the pixel 50, without Figure 2 The insulating layer 12 in the embodiment of the present invention. The diffusion layer 30 may be disposed between the reflection layer 20 and the lower line 40. The diffusion layer 30 may be flat.

[0056] Fig. 7Aand 7B Each shows Figure 6 An example of the diffusion layer 30 in FIG.

[0057] Reference Fig. 7A and Figure 7B , the diffusion layer 30 may have a plurality of diffusion particles 39. The diffusion particles 39 may be disposed in the diffusion layer 30. When the diffusion layer 30 is extended in the first direction D1 or the second direction D2, the distance between the diffusion particles 39 may decrease. The diffusion particles 39 may each have a refractive index higher than that of the diffusion layer 30. For example, the diffusion particles 39 may include a transparent polymer.

[0058] Figure 8 One example of a stretchable display device 100 according to an embodiment of the inventive concept is shown. Fig. 9 and Fig.10 The Figure 8 Views taken along lines II-II' and III-III'.

[0059] Reference Figures 8 to 10 , the light emitting diodes 56 of the stretchable display device 100 according to an embodiment of the inventive concept may be arranged in a ring shape. In a plan view, the diffusion layer 30 may be disposed outside and inside the light emitting diodes 56. The diffusion layer 30 may overlap the light emitting diodes 56.

[0060] Reference Fig. 9 The diffusion layer 30 may include a boundary diffusion layer 32 , a lens diffusion layer 34 and an internal diffusion layer 36 .

[0061] The boundary diffusion layer 32 may be disposed outside the light emitting diode 56. The boundary diffusion layer 32 may surround the periphery of the pixel 50. That is, the boundary diffusion layer 32 may be disposed at the boundary of the pixel 50. The boundary diffusion layer 32 may have a plan view as follows: Figure 8 The boundary diffusion layer 32 can diffuse light to the outside of the light emitting diode 56.

[0062] The internal diffusion layer 36 may be disposed between the light emitting diodes 56. The internal diffusion layer 36 may be disposed inside the light emitting diodes 56. The internal diffusion layer 36 may have a circular shape in a plan view. The internal diffusion layer 36 may diffuse light between the light emitting diodes 56.

[0063] The lens diffusion layer 34 may be disposed between the inner diffusion layer 36 and the boundary diffusion layer 32. The lens diffusion layer 34 may be disposed below the light emitting diode 56. The lens diffusion layer 34 may diffuse light below the light emitting diode 56.

[0064] Reference Fig.10The lens diffusion layer 34 may include a first fan-shaped diffusion layer 31 , a second fan-shaped diffusion layer 33 and a third fan-shaped diffusion layer 35 .

[0065] The first fan-shaped diffusion layer 31 may be aligned below the first light emitting diode 51. The first fan-shaped diffusion layer 31 may diffuse the red light of the first light emitting diode 51.

[0066] The second fan-shaped diffusion layer 33 may be disposed at one side of the first fan-shaped diffusion layer 31. The second fan-shaped diffusion layer 33 may be aligned below the second light emitting diode 53. The second fan-shaped diffusion layer 33 may diffuse the green light of the second light emitting diode 53.

[0067] The third fan-shaped diffusion layer 35 may be disposed at one side of the second fan-shaped diffusion layer 33. The third fan-shaped diffusion layer 35 may be aligned below the third light emitting diode 55. The third fan-shaped diffusion layer 35 may diffuse the blue light of the third light emitting diode 55.

[0068] Fig.11 One example of a stretchable display device 100 according to an embodiment of the inventive concept is shown.

[0069] Reference Fig.11 , the light emitting diodes 56 of the stretchable display device 100 according to an embodiment of the inventive concept may be arranged in a circular shape. Each of the first light emitting diode 51, the second light emitting diode 53, and the third light emitting diode 55 may have a fan-shaped 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 an azimuth direction.

[0070] Fig.12 One example of a stretchable display device 100 according to an embodiment of the inventive concept is shown.

[0071] Reference Fig.12 , the light emitting diodes 56 of the stretchable display device 100 according to the embodiment of the inventive concept may be arranged in a rectangular 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 an azimuth direction. The first light emitting diode 51 and the second light emitting diode 53 may each have a trapezoidal shape. The third light emitting diode 55 may have a pentagonal shape.

[0072] Fig.13 Shows Fig.12 An example of a pixel 50, a scan line 42, and a data line 44 in FIG.

[0073] Reference Fig.13, the upper substrate 52 of the pixel 50 may be connected to one scan line 42 in the first direction D1, and to three data lines 44 in the second direction D2. The scan line 42 and the data line 44 may each have a meandering shape in a plan view. The scan line 42 and the data line 44 may extend in the first direction D1 and the second direction D2, respectively.

[0074] As described above, the stretchable display device according to an embodiment of the inventive concept may reduce or minimize a reduction in resolution using a diffusion layer between a lower substrate and pixels when the lower substrate is stretched.

[0075] Although the embodiments of the present invention have been described, it is understood that the present invention should not be limited to these embodiments, but various changes and modifications can be made by those of ordinary skill in the art within the spirit and scope of the claimed invention. Therefore, it should be understood that the above embodiments are intended to be illustrative, rather than limiting in all aspects.

Claims

1. A stretchable display device, comprising: lower base plate; a reflective layer on the lower substrate; a pixel disposed on the reflective layer and configured to generate light; The diffusion layer is disposed between the pixel and the reflection layer and is configured to diffuse the light onto the reflection layer.

2. The stretchable display device according to claim 1, wherein: Each of the pixels comprises: upper base plate; First to third light emitting diodes are provided on the upper substrate.

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

4. The stretchable display device according to claim 3, wherein: The diffusion layer comprises: A boundary diffusion layer is arranged outside the first to third light-emitting diodes; An internal diffusion layer, disposed inside the boundary diffusion layer; The lens diffusion layer is disposed between the inner diffusion layer and the boundary diffusion layer and is disposed below each of the first to third light emitting diodes.

5. The stretchable display device according to claim 4, wherein: The lens diffusion layer includes a first fan-shaped diffusion layer to a third fan-shaped diffusion layer, wherein the first fan-shaped diffusion layer to the third fan-shaped diffusion layer are aligned under the first light-emitting diode to the third light-emitting diode, respectively.

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

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

8. The stretchable display device according to claim 1, wherein: The diffusion layer has a semicircular or half-moon shape.

9. The extendable display device according to claim 1, further comprising: An insulating layer is between the diffusion layer and the reflection layer.

10. The stretchable display device according to claim 1, wherein: The diffusion layer has a plurality of diffusion particles.

11. A stretchable display device, comprising: substrate; A reflective layer, disposed on the substrate; an insulating layer, disposed on the reflective layer; a pixel disposed on the insulating layer and configured to generate light; A diffusion layer is disposed in the insulating layer and is configured to diffuse the light onto the reflective layer.

12. The stretchable display device according to claim 11, wherein: The substrate includes a stretchable substrate.

13. The stretchable display device according to claim 11, wherein: The diffusion layer includes a boundary diffusion layer, wherein the boundary diffusion layer is disposed outside the pixel.

14. The stretchable display device according to claim 13, wherein: The diffusion layer further includes an inner diffusion layer inside the boundary diffusion layer.

15. The stretchable display device according to claim 14, wherein: The diffusion layer further includes a lens diffusion layer, wherein the lens diffusion layer is disposed between the boundary diffusion layer and the internal diffusion layer.

16. A stretchable display device, comprising: substrate; a reflective layer on the substrate; Pixels, arranged on the reflective layer; a diffusion layer, disposed between the pixel and the reflective layer, Wherein, the diffusion layer includes a first sector-shaped diffusion layer to a third sector-shaped diffusion layer.

17. The stretchable display device according to claim 16, wherein: The first to third sector-shaped diffusion layers are arranged in a ring shape.

18. The stretchable display device according to claim 16, wherein: Each of the pixels includes first to third light emitting diodes on the first to third fan-shaped diffusion layers.

19. The stretchable display device according to claim 16, wherein: The diffusion layer further includes: an inner diffusion layer, wherein the inner diffusion layer is between the first sector-shaped diffusion layer to the third sector-shaped diffusion layer.

20. The stretchable display device according to claim 16, wherein: The diffusion layer further includes: a boundary diffusion layer, wherein the boundary diffusion layer is outside the first to third sector-shaped diffusion layers.

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