Display device

Abstract

The invention provides a display device which comprises a display panel, a flexible light guide plate, a light-emitting assembly and an optical layer. The display panel has a display side and a back side opposite the display side. The flexible light guide plate comprises a light source part, a light incident part and a middle part between the light source part and the light incident part. The middle part is bent with the bending radius smaller than 1 mm, so that the light source part is arranged on the display side of the display panel, the light incident part is arranged on the back side of the display panel, and the Young's modulus of the soft light guide plate is about 10-1000 million Pa (MPa). The light-emitting assembly is arranged adjacent to the light incident part of the flexible light guide plate, and the light-emitting surface of the light-emitting assembly faces the side edge of the flexible light guide plate. The optical layer is arranged on and contacts the surface of the light source part of the flexible light guide plate, and a first refractive index difference between the optical layer and the flexible light guide plate is in a range of 0.1 to 0.2.

Description

Technical Field

[0001] The present invention relates to an electronic product, and in particular to a display device. Background Art

[0002] Large screens and narrow bezels are key design and development trends for many electronic products. In addition to minimizing the size of circuitry components within the non-display area, some product designs also incorporate these components on the back of the product. However, achieving narrow bezels is challenging for traditional light-source products, as the light source is located between the display panel and the user. Summary of the Invention

[0003] The present invention is directed to a display device that can realize a front light source product with a narrow frame.

[0004] According to an embodiment of the present invention, a display device includes a display panel, a flexible light guide plate, a light-emitting component, and an optical layer. The display panel has a display side and a back side opposite to the display side. The flexible light guide plate includes a light source portion, a light incident portion, and an intermediate portion between the light source portion and the light incident portion. The intermediate portion is bent with a bending radius of less than 1 millimeter (mm) so that the light source portion is arranged on the display side of the display panel, and the light incident portion is arranged on the back side of the display panel, wherein the Young's modulus of the flexible light guide plate is approximately 10 to 1000 megapascals (MPa). The light-emitting component is arranged adjacent to the light incident portion of the flexible light guide plate, and the light-emitting surface of the light-emitting component faces the side of the flexible light guide plate. The optical layer is arranged on and contacts the surface of the light source portion of the flexible light guide plate, and the first refractive index difference between the optical layer and the flexible light guide plate falls in the range of 0.1 to 0.2.

[0005] In the display device according to the embodiment of the present invention, the thickness of the flexible light guide plate is 100 μm to 200 μm.

[0006] In the display device according to the embodiment of the present invention, the refractive index of the flexible light guide plate is greater than the refractive index of the optical layer.

[0007] In a display device according to an embodiment of the present invention, the storage modulus of the optical layer is between 10 kPa and 60 kPa. The optical layer exposes the light-entry portion and the middle portion of the flexible light guide plate, and the thickness of the optical layer is, for example, between 25 μm and 75 μm.

[0008] In a display device according to an embodiment of the present invention, the optical layer continuously covers the light source portion, light incident portion, and intermediate portion of the flexible light guide plate, and the thickness of the optical layer is 5 to 25 microns. The display device may further include an adhesive layer, with the optical layer disposed between the adhesive layer and the flexible light guide plate. The adhesive layer may have a greater refractive index than the optical layer, for example.

[0009] In a display device according to an embodiment of the present invention, the optical layer comprises two layers, including a first optical layer and a second optical layer. The first optical layer is disposed on a first surface of the light source portion of the flexible light guide plate, and the second optical layer is disposed on a second surface of the light source portion of the flexible light guide plate, with the first surface and the second surface facing each other.

[0010] In the display device according to the embodiment of the present invention, the display device further comprises a stacked layer, wherein the flexible light guide plate and the optical layer are located between the stacked layer and the display panel.

[0011] Based on the above, a display device according to an embodiment of the present invention includes a front light source comprising a flexible light guide plate and a light-emitting component. The flexible light guide plate can be bent and partially positioned on the back side of the display panel, and the light-emitting component is positioned on the back side of the display panel. This eliminates the need for a light-emitting component on the display side of the display device, enabling a narrow bezel design. Furthermore, optical layers can be positioned on both sides of the flexible light guide plate, with the refractive index difference between the optical layer and the flexible light guide plate falling within a range of 0.1 to 0.2. This helps guide light outward and improves light utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic diagram of a display device according to an embodiment of the present invention;

[0013] Figure 2 is a schematic diagram of a display device according to an embodiment of the present invention;

[0014] Figure 3 FIG. 1 is a schematic diagram of a display device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0015] Reference will now be made in detail to exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals are used in the drawings and the description to refer to the same or like parts.

[0016] Figure 1 FIG. 1 is a schematic diagram of a display device according to an embodiment of the present invention. Figure 1In the embodiment, the display device 100 basically includes a display panel 110, a flexible light guide plate 120, and a light-emitting component 130. The display panel 110 has a display side 112 and a back side 114 opposite the display side 112. The flexible light guide plate 120 is disposed on the display panel 110. The light-emitting component 130 is disposed so that the light-emitting surface 132 of the light-emitting component 130 faces the side 122 of the flexible light guide plate 120. The flexible light guide plate 120 can guide light emitted by the light-emitting component 130 to the display side 112 of the display panel 110 and allow the light emitted by the light-emitting component 130 to be irradiated toward the display panel 110. The display panel 110 can be a reflective display panel, and the light irradiated toward the display panel 110 by the flexible light guide plate 120 is reflected by the display panel 110 to provide a display image to a user facing the display side 112. Therefore, the display device 100 is a front-lit product. In some embodiments, the display panel 110 is, for example, an electronic paper display panel.

[0017] In some embodiments, the flexible light guide plate 120 may include a light source portion 1202, a light incident portion 1204, and a middle portion 1206 between the light source portion 1202 and the light incident portion 1204. The flexible light guide plate 120 is larger than the display panel 110, and the light source portion 1202, the light incident portion 1204, and the middle portion 1206 may be distinguished based on the positional relationship between the flexible light guide plate 120 and the display panel 110. For example, the portion of the flexible light guide plate 120 located on the display side 112 of the display panel 110 and overlapping the display panel 110 in the thickness direction may be the light source portion 1202. The portion of the flexible light guide plate 120 extending beyond the display panel 110 and adjacent to the light-emitting element 130 may be the light incident portion 1204. The portion of the flexible light guide plate 120 extending beyond the display panel 110 and located between the light incident portion 1204 and the light source portion 1202 may be the middle portion 1206. The light source portion 1202, the light incident portion 1204, and the middle portion 1206 are distinguished by relative positions without physical boundaries therebetween, but the present invention is not limited thereto. In addition, the light source portion 1202 can be used to provide light to the display panel 110, and thus the light source portion 1202 can have multiple microstructures (such as dot structures) to distribute the light.

[0018] The Young's modulus of the flexible light guide plate 120 is lower than 1000 megapascals, for example, it is approximately between 10 and 1000 megapascals. In some embodiments, the material of the flexible light guide plate 120 may include thermoplastic polyurethane (TPU), polydimethylsiloxane (PDMS) or the like, but is not limited thereto. In addition, the thickness of the flexible light guide plate 120 is, for example, 100 microns to 200 microns. The light-emitting component 130 includes, for example, a light-emitting diode having a certain height (such as 400 microns to 600 microns), so the thickness of the flexible light guide plate 120 is greater than 100 microns to allow the light of the light-emitting component 130 to fully enter the flexible light guide plate 120 to achieve good light utilization efficiency. In some embodiments, the light-emitting component 130 may be a light bar including a plurality of light-emitting diodes, but is not limited thereto.

[0019] In some embodiments, the flexible light guide plate 120 having a thickness of 100 to 200 microns is bendable. For example, the middle portion 1206 of the flexible light guide plate 120 can be bent in the direction of arrow A1 so that the light entrance portion 1204 is disposed on the back side 114 of the display panel 110. The light-emitting component 130 adjacent to the light entrance portion 1204 of the flexible light guide plate 120 can be located on the back side 114 of the display panel 110, and the light-emitting surface 132 of the light-emitting component 130 remains facing the side 122 of the flexible light guide plate 120. In this way, the display device 100 does not need to reserve an area for the installation of the light-emitting component 130 and can achieve a narrow bezel design. In other words, the width of the bezel around the display area of ​​the display device 100 can be smaller than the width of the light-emitting component 130.

[0020] The display device 100 may further include an optical layer 140, and the optical layer 140 is disposed on and contacts the surface of the light source portion 1202 of the flexible light guide plate 120. The optical layer 140 has two layers, for example. The difference in refractive index between each optical layer 140 and the flexible light guide plate 120 falls within the range of 0.1 to 0.2, for example. In some embodiments, the refractive index of the flexible light guide plate 120 may be less than 1.5. The storage modulus of each optical layer 140 may be less than 60 kPa, for example, ranging from 10 kPa to 60 kPa, but is not limited thereto. In some embodiments, the material of each optical layer 140 is, for example, a silicone (siliicon) system optical adhesive, and each optical layer 140 may also serve as an adhesive layer. In Figure 1 In the embodiment, each optical layer 140 can expose the light incident portion 1204 and the middle portion 1206 of the flexible light guide plate 120 , and the thickness of each optical layer 140 is 25 μm to 75 μm. In other words, each optical layer 140 can be disposed to overlap only the light source portion 1202 of the flexible light guide plate 120 .

[0021] The optical layer 140 may include a first optical layer 142 and a second optical layer 144. The first optical layer 142 may be disposed on and in contact with the first surface S1 of the light source portion 1202 of the flexible light guide plate 120, and the second optical layer 144 may be disposed on and in contact with the second surface S2 of the light source portion 1202 of the flexible light guide plate 120, with the first surface S1 and the second surface S2 facing each other. The first optical layer 142 may directly contact the flexible light guide plate 120 and the display panel 110 for attaching the flexible light guide plate 120 to the display side 112 of the display panel 110. In one embodiment, the optical layer 140 may be coated on the flexible light guide plate 120. In some embodiments, the display device 100 further includes an additional stacked layer 150, and the light source portion 1202 of the flexible light guide plate 120 and the two optical layers 140 (the first optical layer 142 and the second optical layer 144) are located between the stacked layer 150 and the display panel 110. When the second optical layer 144 also serves as an adhesive layer, the stacked layer 150 can be attached to the second surface S2 of the flexible light guide plate 120 via the second optical layer 144 in the optical layer 140. In some embodiments, the stacked layer 150 can include a touch panel, a protective layer, a combination of the two, or any combination of the two and other layered components.

[0022] After light emitted from the light-emitting component 130 enters the flexible light guide plate 120, it travels through the light entrance portion 1204 and the intermediate portion 1206 within the flexible light guide plate 120 to reach the light source portion 1202. In some embodiments, the refractive index of the flexible light guide plate 120 is greater than the refractive index of each optical layer 140. Therefore, light within the flexible light guide plate 120 can travel within the light source portion 1202 away from the intermediate portion 1206. In some embodiments, the flexible light guide plate 120 may have dispersed microstructures (e.g., dots) so that light within the flexible light guide plate 120 can exit the flexible light guide plate 120 locally at different locations within the light source portion 1202, thereby radiating light toward or away from the display panel 110. In some embodiments, the refractive index difference between the individual optical layers 140 and the flexible light guide plate 120 falls within the range of 0.1 to 0.2, for example. This helps control the total internal reflection at the interface between the individual optical layers 140 and the flexible light guide plate 120 so that a sufficient amount of light is directed toward the display panel 110 as a display light source, which helps optimize the display effect and light utilization of the display device 100.

[0023] In some embodiments, when the thickness of the flexible light guide plate 120 is, for example, 150 microns, the refractive index of the flexible light guide plate 120 is, for example, approximately 1.51, and the refractive index of each optical layer 140 is, for example, approximately 1.41, the light provided by the light-emitting component 130 can have a distribution uniformity of up to 80% in the light source area 1202 of the flexible light guide plate 120. Here, the distribution uniformity can be estimated using a nine-point uniformity detection method. For example, nine points are selected in the display area (or active area) for detection, and the detection points must include the center point of the panel and eight additional points, where the distance between the outermost point and the edge of the display area is 1 / 6 of the length / width of the display area. During the detection, a light measuring instrument can be used to measure at the above-mentioned detection points in a direction perpendicular to the display device 100, so that the uniformity can be calculated from the detection results of each point. In addition, the brightness efficiency of the display device 100 can reach approximately 130 nits / W. The contrast ratio of the display panel 110 in the off state can reach 19, while the contrast ratio of the display panel 110 in the on state can reach 14.5. Overall, the brightness efficiency of the display device 100 can be improved and the brightness uniformity can be optimized.

[0024] Figure 2 FIG. 1 is a schematic diagram of a display device according to an embodiment of the present invention. Figure 2 , the display device 200 is similar to Figure 1 The display device 100 of the two embodiments is shown in FIG. 1 , and the components represented by the same component symbols in the two embodiments can be referenced to each other. In other words, Figure 2 The structure, material, configuration position, properties, etc. of the display panel 110, the flexible light guide plate 120, the light emitting component 130 and the stacked layer 150 of the display device 200 can be referred to Figure 1 In this embodiment, the optical layer 240 of the display device 200 is different from Figure 1 The optical layer 140 in FIG. Figure 2 As shown, the optical layer 240 continuously covers the light source portion 1202, the light incident portion 1204, and the middle portion 1206 of the flexible light guide plate 120. The thickness of the optical layer 240 is, for example, 5 to 25 microns. Furthermore, the display device 200 further includes an adhesive layer 260, wherein the optical layer 240 is disposed between the adhesive layer 260 and the light source portion 1202 of the flexible light guide plate 120.

[0025] In this embodiment, the optical layer 240 has two layers, and the adhesive layer 260 also has two layers. The two optical layers 240 can be respectively a first optical layer 242 disposed on the first surface S1 of the light source portion 1202 of the flexible light guide plate 120 and a second optical layer 244 disposed on the second surface S2 of the light source portion 1202 of the flexible light guide plate 120. The two adhesive layers 260 can be respectively a first adhesive layer 262 contacting the first optical layer 242 and a second adhesive layer 264 contacting the second optical layer 244. The first optical layer 242 and the second optical layer 244 can be made of the same material and can be formed on the surface of the flexible light guide plate 120 by coating, but are not limited thereto. In some embodiments, the first optical layer 242 and the first adhesive layer 262 can be applied to Figure 1 The display device 100 replaces the first optical layer 142, or the second optical layer 244 and the second adhesive layer 264 can be applied to Figure 1 The second optical layer 144 is replaced in the display device 100 .

[0026] In some embodiments, the difference in refractive index between each optical layer 240 and the flexible light guide plate 120 may fall within a range of 0.1 to 0.2, and the refractive index of each optical layer 240 may be lower than that of the flexible light guide plate 120. Therefore, the provision of each optical layer 240 allows light traveling within the flexible light guide plate 120 to exit the flexible light guide plate 120 at different locations. Furthermore, the refractive index of each adhesive layer 260 may be higher than that of each optical layer 240, allowing light traveling through the optical layer 240 to exit the optical layer 240 without being confined within the optical layer 240. In some embodiments, the material of each adhesive layer 260 may include, but is not limited to, an acrylic optical adhesive.

[0027] In some embodiments, the refractive index of the flexible light guide plate 120 is greater than that of the respective adhesive layers 260, and the refractive index of the respective adhesive layers 260 is greater than that of the respective optical layers 240. In some embodiments, when the thickness of the flexible light guide plate 120 is approximately 150 microns, the refractive index of the flexible light guide plate 120 is approximately 1.51, the refractive index of the respective optical layers 240 is less than 1.40, and the refractive index of the respective adhesive layers 260 is approximately 1.47, the light provided by the light-emitting component 130 can achieve a uniformity of 80% in the light source region 1202 of the flexible light guide plate 120. Furthermore, the luminance efficiency of the display device 100 can reach approximately 190 Nits / W. The contrast ratio of the display panel 110 can reach 20 when it is off, and 17.2 when it is on.

[0028] Figure 3 Schematic diagram of a display device according to an embodiment of the present invention. For the purpose of illustration, Figure 3The display device 300 omits the optical layer 140 or the combination of the optical layer 240 and the adhesive layer 260 described in the above embodiments. However, in a specific example of implementing the display device 300, the optical layer 140 or the combination of the optical layer 240 and the adhesive layer 260 described in the above embodiments may be included. In some embodiments, Figure 3 Examples can be used to illustrate Figure 1 Display device 100 or Figure 2 The flexible light guide plate of the display device 200 is bent.

[0029] Figure 3 The display device 300 includes a display panel 110, a flexible light guide plate 120, a light emitting component 130, a stacked layer 150, and an adhesive 170. The configuration relationship of the display panel 110, the flexible light guide plate 120, the light emitting component 130, and the stacked layer 150 can be referred to. Figure 1 and Figure 2 The display panel 110 has a display side 112 and a back side 114 opposite the display side 112. The flexible light guide plate 120 includes a light source portion 1202, a light incident portion 1204, and an intermediate portion 1206 between the light source portion 1202 and the light incident portion 1204. The Young's modulus of the flexible light guide plate 120 is approximately 10 to 1000 megapascals, and the thickness of the flexible light guide plate 120 can be 100 to 200 microns.

[0030] The flexible light guide plate 120 is a bendable light guide plate. Figure 3 As shown, the flexible light guide plate 120 is bent, for example, with a bending radius R of less than 1 mm, such that the light source portion 1202 is disposed on the display side 112 of the display panel 110, and the light incident portion 1204 is disposed on the back side 114 of the display panel 110. Furthermore, the light source portion 1202 is substantially parallel to the display side 112 of the display panel 110. The light-emitting element 130 is also disposed on the back side 114 of the display panel 110, and the light-emitting element 130 is positioned such that the light-emitting surface 132 faces the side 122 of the flexible light guide plate 120. The side 122 of the flexible light guide plate 120 can also be understood as the light incident surface of the flexible light guide plate 120.

[0031] In some embodiments, a layer may be provided between the stacked layer 150 and the flexible light guide plate 120. Figure 1 The second optical layer 144, and the stacked layer 150 can be Figure 1 The second optical layer 144 is attached to the flexible light guide plate 120. In some embodiments, a second optical layer 144 may be provided between the stacked layer 150 and the flexible light guide plate 120. Figure 2 The second adhesive layer 264 and the second optical layer 244, and the stacked layer 150 can be Figure 2The second adhesive layer 264 is attached to the flexible light guide plate 120. In this embodiment, the stacked layer 150 may include a touch panel 152 and a protective layer 154. The light source portion 1202 of the flexible light guide plate 120 and the optical layers 140 and 240 (not shown) are connected. Figure 1 、 Figure 2 ) is located between the protective layer 154 and the display panel 110, and the flexible light guide plate 120 and the optical layers 140 and 240 (see Figure 1 、 Figure 2 ) is located between the touch panel 152 and the display panel 110. In addition, the touch panel 152 is located between the protective layer 154 and the flexible light guide plate 120. In other embodiments, the stacked layer 150 may include one of the touch panel 152 and the protective layer 154. In some embodiments, the touch panel 152 may be larger than the display panel 110, and the touch panel 152 is flexible. The touch panel 152 may be further attached to the light incident portion 1204 of the flexible light guide plate 120. A portion of the touch panel 152 may be bent to the back side 114 of the display panel 110 in accordance with the flexible light guide plate 120, and fixed to the back side 114 of the display panel 110 by attaching the adhesive 170.

[0032] The touch panel 152 may include a supporting substrate, touch electrodes, and a touch drive circuit (not shown) to provide touch operation functions. The protective layer 154 may be a transparent film that allows light to pass through. In some embodiments, the protective layer 154 may be an anti-glare film. In some embodiments, the protective layer 154 may be a film layer / plate that has a water vapor barrier and supportive properties. In some embodiments, the protective layer 154 may be a composite layer of multiple thin films stacked together.

[0033] The light-emitting element 130 and the touch driver circuit on the touch panel 152 are all components that can affect the display image. However, the flexible light guide plate 120 and the touch panel 152 are bendable, allowing these components that would obscure the display image to be placed on the back side 114 of the display panel 110. This way, the display area of ​​the display device 300 is not limited by these components that affect the display image, allowing it to be maximized and have a narrow bezel design.

[0034] Figure 3 The flexible light guide plate 120 in the display device 300 shown in FIG. 3 can be applied to Figure 1 The display device 100 and Figure 2 Therefore, the display device 100, the display device 200 and the display device 300 can set the component that blocks the display area on the back side 114 of the display panel 110. In addition, the flexible light guide plate 120 is bent with a radius of less than 1 mm, which helps to achieve a narrow frame design. Figure 1The display device 100 and Figure 2 In the display device 200, an optical layer 140 / 240 may be provided on the opposite first surface S1 and second surface S2 of the flexible light guide plate 120, and the difference in refractive index between the flexible light guide plate 120 and the optical layer 140 / 240 falls between 0.1 and 0.2, which helps to transmit light in the flexible light guide plate 120 and optimize the light utilization efficiency and brightness uniformity of the display device 100 / 200 / 300. Figure 3 Although the optical layer 140 / 240 is not shown, the display device 300 may also include Figure 1 The optical layer 140, or Figure 2 The optical layer 240 and the adhesive layer 260 are combined. In addition, the display devices 100, 200, and 300 can be bendable flexible display devices. In addition to the flexible light guide plate 120, the optical layers 140 / 240, the display panel 110, and the stacked layer 150 can all be made of bendable flexible materials.

[0035] In addition, the display devices 100, 200, and 300 may further include or be connected to a display driver circuit (not shown) of the display panel 110. The display driver circuit may include a driver integrated circuit (or driver IC) and a flexible printed circuit board connecting the driver IC to the display panel 110. The flexible printed circuit board of the display driver circuit may be bent so that the driver IC is located on the back side 114 of the display panel 110. In some embodiments, the flexible printed circuit board of the display driver circuit and the flexible light guide plate 120 may extend from the same side of the display panel 110. However, in some embodiments, the flexible printed circuit board of the display driver circuit and the flexible light guide plate 120 may extend from different sides of the display panel 110.

[0036] In summary, the display device of an embodiment of the present invention has a flexible light guide plate. The flexible light guide plate can be bent to the back side of the display panel, allowing the light-emitting component to be placed on the back side, which helps to achieve a narrow frame design. In some embodiments, the flexible light guide plate has a thickness corresponding to the light-emitting component, allowing most of the light emitted by the light-emitting component to enter the light guide plate, which helps to improve the efficiency of light utilization and achieve energy saving. In some embodiments, the display device includes an optical layer that contacts the flexible light guide plate, and the refractive index difference between the flexible light guide plate and the optical layer falls within the range of 0.1 to 0.2, which helps to ensure the travel of light within the flexible light guide plate and optimize the uniformity of light distribution.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display device, characterized in that: include: a display panel having a display side and a back side opposite to the display side; A flexible light guide plate comprising a light source portion, a light incident portion, and an intermediate portion between the light source portion and the light incident portion, wherein the intermediate portion is bent with a bending radius of less than 1 mm such that the light source portion is disposed on the display side of the display panel and the light incident portion is disposed on the back side of the display panel, wherein the Young's modulus of the flexible light guide plate is approximately 10 to 1000 megapascals; a light-emitting component disposed adjacent to the light incident portion of the flexible light guide plate, with a light-emitting surface of the light-emitting component facing a side edge of the flexible light guide plate; as well as The optical layer is disposed on and contacts the surface of the light source portion of the flexible light guide plate, and the difference in refractive index between the optical layer and the flexible light guide plate falls within a range of 0.1 to 0.

2.

2. The display device according to claim 1, wherein The thickness of the flexible light guide plate is 100 micrometers to 200 micrometers.

3. The display device according to claim 1, wherein The refractive index of the flexible light guide plate is greater than the refractive index of the optical layer.

4. The display device according to claim 1, wherein The storage modulus of the optical layer is within a range of 10 kPa to 60 kPa.

5. The display device according to claim 4, wherein: The optical layer exposes the light incident portion and the middle portion of the flexible light guide plate, and the thickness of the optical layer is 25 micrometers to 75 micrometers.

6. The display device according to claim 1, wherein The optical layer continuously covers the light source portion, the light incident portion, and the middle portion of the flexible light guide plate, and the thickness of the optical layer is 5 micrometers to 25 micrometers.

7. The display device according to claim 6, wherein: An adhesive layer is further included, and the optical layer is arranged between the adhesive layer and the light source portion of the flexible light guide plate.

8. The display device according to claim 7, wherein: The adhesive layer has a greater refractive index than the optical layer.

9. The display device according to claim 1, wherein The optical layer has two layers and includes a first optical layer and a second optical layer. The first optical layer is arranged on the first surface of the light source part of the flexible light guide plate, and the second optical layer is arranged on the second surface of the light source part of the flexible light guide plate, and the first surface is opposite to the second surface.

10. The display device according to claim 1, wherein It also includes a stacked layer, wherein the flexible light guide plate and the optical layer are located between the stacked layer and the display panel.

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