Decorative panel and display device

Abstract

The present invention discloses a decorative panel and a display device. The display device includes a first substrate, a first transparent conductive layer, a light-transmitting structure, a second substrate, a second transparent conductive layer, and a first cholesteric liquid crystal layer. The first transparent conductive layer is disposed on the first substrate. The light-transmitting structure is disposed on the first substrate. The second substrate is disposed opposite to the first substrate. The second transparent conductive layer is disposed on the second substrate. The first cholesteric liquid crystal layer is disposed between the first transparent conductive layer and the second transparent conductive layer. The display device is adapted to present a decorative pattern, and the decorative pattern corresponds to the light-transmitting structure.

Description

Technical Field

[0001] The present invention relates to an optoelectronic panel and an optoelectronic device, and more particularly to a decorative panel and a display device. Background Art

[0002] In recent years, the electric vehicle market has developed rapidly. Generally, electric vehicles use a very high proportion of display devices to display driving information and / or entertainment information. To create the overall atmosphere of the vehicle interior space, the surface of the display device often has a decorative film that can present decorative patterns, such as wood grain, checkerboard decorative films, etc. However, regardless of whether the display device is turned on or off, the decorative pattern of the display device always exists, and the user cannot freely choose whether to present the decorative pattern according to their needs. Summary of the Invention

[0003] The present invention provides a decorative panel that can present or not present a decorative pattern according to the user's choice.

[0004] The present invention provides a display device that can present or not present a decorative pattern according to the user's choice.

[0005] The decorative panel of the present invention includes a first substrate, a first transparent conductive layer, a light-transmitting structure, a second substrate, a second transparent conductive layer, and a first cholesteric liquid crystal layer. The first transparent conductive layer is disposed on the first substrate. The light-transmitting structure is disposed on the first substrate. The second substrate is disposed opposite to the first substrate. The second transparent conductive layer is disposed on the second substrate. The first cholesteric liquid crystal layer is disposed between the first transparent conductive layer and the second transparent conductive layer. The decorative panel is adapted to present a decorative pattern, and the decorative pattern corresponds to the light-transmitting structure.

[0006] The display device of the present invention includes the above-mentioned decorative panel and a display panel. The decorative panel is disposed above the display panel. The display device is adapted to present a decorative pattern, and the decorative pattern corresponds to the light-transmitting structure. Brief Description of the Drawings

[0007] Figure 1 is a schematic cross-sectional view of a display device according to an embodiment of the present invention;

[0008] Figure 2 is a schematic diagram of a decorative pattern according to an embodiment of the present invention;

[0009] Figure 3 is a schematic diagram of the relationship between the incident light wavelength and the reflectivity of the first cholesteric liquid crystal layer with various thicknesses;

[0010] Figure 4 is a schematic cross-sectional view of a display device according to another embodiment of the present invention;

[0011] Figure 5 is a schematic cross-sectional view of a display device according to yet another embodiment of the present invention;

[0012] Figure 6 Schematic cross-sectional view of a display device according to another embodiment of the present invention.

[0013] Symbol description

[0014] 10, 10A, 10B, 10C: Display device

[0015] 100: Display panel

[0016] 200: Decorative panel

[0017] 200a: First region

[0018] 200b: Second region

[0019] 200b-1: First sub-region

[0020] 200b-2: Second sub-region

[0021] 210: First substrate

[0022] 220: First transparent conductive layer

[0023] 230: Light-transmitting structure

[0024] 232: First part

[0025] 234: Second part

[0026] 240: Second substrate

[0027] 250: Second transparent conductive layer

[0028] 260: First cholesteric liquid crystal layer

[0029] 300: Color adjustment section

[0030] 320: Third transparent conductive layer

[0031] 330: Third substrate

[0032] 340: Fourth transparent conductive layer

[0033] 350: Second cholesteric liquid crystal layer

[0034] d: Distance

[0035] H, H1, H2: Height

[0036] P: Pitch

[0037] PT: Decoration pattern

[0038] PTa: Wood area

[0039] PTb, PTb-1, PTb-2: Wood grain area

[0040] T, T1, T2, T2-1, T2-2: Thickness

[0041] z: Direction Detailed implementation manners

[0042] 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 will be used in the drawings and the description to refer to the same or like parts.

[0043] It should be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element, or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, no intervening elements are present. As used herein, "connected" can refer to physical and / or electrical connection. Furthermore, "electrically connected" or "coupled" can mean that there are other elements between two elements.

[0044] As used herein, "about", "approximate", or "substantially" includes the stated value and an average within an acceptable deviation range of a particular value determined by one of ordinary skill in the art, taking into account the particular amount of the measurement and the errors associated with the measurement (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations of the stated value, or within ±30%, ±20%, ±10%, ±5%. Furthermore, "about", "approximate", or "substantially" as used herein can be selected to have a more acceptable deviation range or standard deviation depending on optical properties, etching properties, or other properties, rather than using one standard deviation for all properties.

[0045] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and this invention, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0046] Figure 1 It is a schematic cross-sectional view of a display device according to an embodiment of the present invention. Figure 2 It is a schematic view of a decorative pattern according to an embodiment of the present invention.

[0047] Please refer to Figure 1, the display device 10 includes a decorative panel 200. In this embodiment, the display device 10 further includes a display panel 100, which is disposed behind the decorative panel 200. Please refer to Figure 1 and Figure 2 , the decorative panel 200 is used to present a decorative pattern PT, and the display panel 100 is used to display information. For example, in this embodiment, the display device 10 can be selectively applied in the vehicle field. The decorative pattern PT presented by the decorative panel 200 is, for example, a wood grain, and the display information of the display panel 100 is, for example, driving information such as vehicle speed and map, but the present invention is not limited thereto. In this embodiment, the display panel 100 can be a self-emitting display panel (for example: a micro light-emitting diode display panel, an organic light-emitting diode display panel, etc.) or a non-self-emitting display panel (for example: a liquid crystal display panel, etc.), and the present invention does not limit it.

[0048] Please refer to Figure 1 , the decorative panel 200 includes a first substrate 210. The first substrate 210 is light-transmissive. For example, in this embodiment, the material of the first substrate 210 can be glass, quartz, an organic polymer, or other applicable materials.

[0049] The decorative panel 200 further includes a first light-transmissive conductive layer 220, which is disposed on the first substrate 210. In this embodiment, the first light-transmissive conductive layer 220 is a whole-surface conductive pattern and can overlap multiple pixels (not shown) of the display panel 100. For example, in this embodiment, the material of the first light-transmissive conductive layer 220 can be a metal oxide, such as: indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, indium germanium zinc oxide, other suitable oxides, or a stacked layer of at least two of the above, but the present invention is not limited thereto.

[0050] The decorative panel 200 further includes a light-transmissive structure 230, which is disposed on the first substrate 210. For example, in this embodiment, the light-transmissive structure 230 can be selectively disposed on the first light-transmissive conductive layer 220, and the first light-transmissive conductive layer 220 is located between the light-transmissive structure 230 and the first substrate 210, but the present invention is not limited thereto. The light-transmissive structure 230 can be conductive or insulating. For example, in this embodiment, the light-transmissive structure 230 can be insulating; the material of the light-transmissive structure 230 is, for example, but not limited to, an organic material. However, the present invention is not limited thereto. In another embodiment, the light-transmissive structure 230 can also be conductive; the material of the light-transmissive structure 230 is, for example, but not limited to, indium tin oxide.

[0051] The decorative panel 200 further includes a second substrate 240, which is disposed opposite to the first substrate 210. The second substrate 240 is light-transmissive. For example, in this embodiment, the material of the second substrate 240 can be glass, quartz, an organic polymer, or other applicable materials.

[0052] The decorative panel 200 further includes a second light-transmitting conductive layer 250 disposed on the second substrate 240. In the present embodiment, the second light-transmitting conductive layer 250 is a conductive pattern on the entire surface, and may overlap a plurality of pixels (not shown) of the display panel 100. For example, in the present embodiment, the material of the second light-transmitting conductive layer 250 may be a metal oxide, such as indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, indium germanium zinc oxide, other suitable oxides, or a stacked layer of at least two of the above, but the present invention is not limited thereto.

[0053] The decorative panel 200 further includes a first cholesteric liquid crystal layer 260 disposed between the first light-transmitting conductive layer 220 and the second light-transmitting conductive layer 250. The pitch of the first cholesteric liquid crystal layer 260 may be determined according to the wavelength that the decorative panel 200 is intended to reflect, and the present invention is not limited thereto.

[0054] Please refer to Figure 1 and Figure 2 , the display device 10 can switch between display and decoration modes. When the display device 10 is in decoration mode, the decoration panel 200 is not enabled (that is, the potential difference between the first light-transmitting conductive layer 220 and the second light-transmitting conductive layer 250 is substantially 0), the first cholesterol liquid crystal layer 260 is in a reflective state (or a planar state), and the display device 10 presents a decorative pattern PT. In particular, the decorative pattern PT presented by the display device 10 corresponds to the light-transmitting structure 230 of the decorative panel 200. In this embodiment, the decorative pattern PT substantially overlaps with the light-transmitting structure 230. That is to say, in the top view of the display device 10, the texture of the decorative pattern PT is substantially consistent with the position of the light-transmitting structure 230. The following coordination Figure 1 , Figure 2 and Figure 3 The mechanism by which the display device 10 presents the decorative pattern PT will be described.

[0055] Figure 3 The relationship between the wavelength of incident light and the reflectivity of the first cholesterol liquid crystal layer of various thicknesses is shown. Figure 3 , P is the pitch of the first cholesterol liquid crystal layer. Taking the wavelength of the incident light equal to 1.6P (for example: 750nm) as an example, when the thickness T of the first cholesterol liquid crystal layer is more times the pitch P (or, when the thickness T of the first cholesterol liquid crystal layer is thicker), the reflectivity of the first cholesterol liquid crystal layer is higher.

[0056] Please refer to Figure 1, the first region 200a of the decorative panel 200 does not include the light-transmitting structure 230, the second region 200b of the decorative panel 200 includes the light-transmitting structure 230, and the thickness T1 of the first cholesteric liquid crystal layer 260 in the first region 200a is greater than the thickness T2 of the first cholesteric liquid crystal layer 260 in the second region 200b. When the display device 10 is in the decorative mode, the decorative panel 200 is not enabled and the first cholesteric liquid crystal layer 260 is in a reflective state. At this time, the reflectivity of the first region 200a is relatively high and tends to present the color that the decorative panel 200 desires to reflect, while the reflectivity of the second region 200b is relatively low (i.e., the transmittance is relatively high) and tends to present the color of the display panel 100 behind the decorative panel 200. Thus, the decorative panel 200 can present the decorative pattern PT (drawn in Figure 2 ).

[0057] For example, in this embodiment, the color that the decorative panel 200 desires to reflect can be red-yellow similar to the color of wood; when the display device 10 is in the decorative mode, the display panel 100 can be selectively disabled and present black. When the display device 10 switches to the decorative mode, the first region 200a of the decorative panel 200 tends to present red-yellow similar to the color of wood, while the second region 200b of the decorative panel 200 tends to present the black color of the disabled display panel 100. That is to say, the first region 200a of the decorative panel 200 is the wood region PTa corresponding to the decorative pattern PT, the second region 200b of the decorative panel 200 corresponds to the wood grain region PTb of the decorative pattern PT, and the entire decorative pattern PT presents a cross-section of a log. However, the present invention is not limited thereto. In other embodiments, by changing the pattern of the light-transmitting structure 230 and / or the height of the light-transmitting structure 230, the decorative pattern PT can also be other patterns.

[0058] In this embodiment, the first cholesteric liquid crystal layer 260 has a pitch, the direction z is perpendicular to the first substrate 210, the first light-transmitting conductive layer 220 and the second light-transmitting conductive layer 250 have a maximum distance d in the direction z, the maximum distance d is the liquid crystal gap of the decorative panel 200, and the ratio of the maximum distance d to the pitch of the first cholesteric liquid crystal layer 260 can fall within the range of 2 to 15, so that the reflectivity of the first region 200a of the decorative panel 200 is high, thereby providing a decorative pattern PT with good visual effects. The ratio of the maximum distance d to the pitch of the first cholesteric liquid crystal layer 260 preferably falls within the range of 5 to 10, but the present invention is not limited thereto.

[0059] In this embodiment, the first light-transmitting conductive layer 220 and the second light-transmitting conductive layer 250 have a maximum distance d in the direction z, the maximum distance d is the liquid crystal gap of the decorative panel 200, the light-transmitting structure 230 has a height H in the direction z, and the maximum distance d and the height H can satisfy: To make the difference in reflectivity between the first region 200a and the second region 200b of the decorative panel 200 large, so that the texture of the decorative pattern PT is more obvious.

[0060] In this embodiment, to present a decorative pattern PT with richer levels, the light-transmitting structure 230 may selectively include a first part 232 and a second part 234 with different heights. The height H1 of the first part 232 of the light-transmitting structure 230 is greater than the height H2 of the second part 234 of the light-transmitting structure 230.

[0061] The second region 200b of the decorative panel 200 includes a first sub-region 200b-1 and a second sub-region 200b-2. The first sub-region 200b-1 of the second region 200b of the decorative panel 200 includes the first part 232 of the higher light-transmitting structure 230. The second sub-region 200b-2 of the second region 200b of the decorative panel 200 includes the second part 234 of the lower light-transmitting structure 230. The thickness T2-1 of the first cholesteric liquid crystal layer 260 in the first sub-region 200b-1 of the second region 200b is less than the thickness T2-2 of the first cholesteric liquid crystal layer 260 in the second sub-region 200b-2 of the second region 200b. When the decorative panel 200 is not enabled and the first cholesteric liquid crystal layer 260 is in a reflective state, the reflectivity of the first sub-region 200b-1 is lower than that of the second sub-region 200b-2. That is to say, the transmittance of the first sub-region 200b-1 will be higher than that of the second sub-region 200b-2, and the first sub-region 200b-1 will present more colors of the display panel 100 than the second sub-region 200b-2. Thus, in this embodiment, the decorative panel 200 can create wood grains corresponding to the first sub-region 200b-1 with a darker color and wood grains corresponding to the second sub-region 200b-2 with a lighter color, thereby making the decorative pattern PT more layered.

[0062] Please refer to Figure 1 and Figure 3, for example, in this embodiment, the pitch of the first cholesterol liquid crystal layer 260 is 0.47 μm. The maximum distance d between the first light-transmissive conductive layer 220 and the second light-transmissive conductive layer 250 (i.e., the liquid crystal gap of the decorative panel 200) can be 4.7 μm (i.e., 10 times the pitch). The reflectivity of the first region 200a is 1, and the first region 200a corresponds to the wood region PTa of the decorative pattern PT. The height H2 of the second part 234 of the light-transmissive structure 230 can be 2.35 μm. The thickness T2-2 of the first cholesterol liquid crystal layer 260 in the second sub-region 200b-2 can be 2.35 μm (i.e., 5 times the pitch). The reflectivity of the second sub-region 200b-2 is 92%, and the second sub-region 200b-2 corresponds to the lighter wood grain region PTb-2 of the decorative pattern PT. The height H1 of the first part 232 of the light-transmissive structure 230 can be 3.76 μm. The thickness T2-1 of the first cholesterol liquid crystal layer 260 in the first sub-region 200b-1 can be 0.94 μm (i.e., 2 times the pitch). The reflectivity of the first sub-region 200b-1 can be 42%, and the first sub-region 200b-1 corresponds to the deeper wood grain region PTb-2 of the decorative pattern PT. The above values are used to illustrate the present invention, but the present invention is not limited thereto.

[0063] Please refer to Figure 1 , on the other hand, in addition to being switchable to the decorative mode, the display device 10 can also be switched to the display mode. When the display device 10 is in the display mode, the decorative panel 200 is enabled (i.e., the potential difference between the first light-transmissive conductive layer 220 and the second light-transmissive conductive layer 250 is substantially greater than 0), and the first cholesterol liquid crystal layer 260 is in a transmissive state. At this time, the display light beam emitted by the display panel 100 will pass through the decorative panel 200 and transmit the display information carried thereon to the user's eyes. In this embodiment, the transmissive state can refer to the focal conic state or the vertical state, and the present invention is not limited thereto.

[0064] It is worth mentioning that by using the decorative panel 200 including the light-transmissive structure 230, the display device 10 can not only present the decorative pattern PT in the decorative mode, but also present the display information of the display panel 100 according to the user's selection without presenting the decorative pattern PT in the display mode, or display the information and the decorative pattern PT simultaneously. That is to say, through the switchable decorative panel 200, the display effect of the display device 10 can be more diversified.

[0065] It must be noted here that the following embodiments follow the component numbers and some contents of the foregoing embodiments, where the same numbers are used to represent the same or similar components, and the description of the same technical content is omitted. For the description of the omitted parts, reference can be made to the foregoing embodiments, and the following embodiments will not be repeated.

[0066] Figure 4 It is a schematic cross-sectional view of a display device according to another embodiment of the present invention.Figure 4 The display device 10A is similar to Figure 1 the display device 10, and the difference between the two is that the positions of the light-transmitting structures 230 of the decorative panels 200 and 200A are different. Please refer to Figure 4 . Specifically, in this embodiment, the light-transmitting structure 230 of the decorative panel 200A is located between the first light-transmitting conductive layer 220 and the first substrate 210.

[0067] Figure 5 is a schematic cross-sectional view of a display device according to another embodiment of the present invention. Figure 5 The display device 10B is similar to Figure 1 the display device 10, and the difference between the two is that: Figure 5 the display device 10B further includes a color adjustment unit 300.

[0068] Please refer to Figure 5 . The color adjustment unit 300 is disposed in front of the decorative panel 200, and the decorative panel 200 is located between the color adjustment unit 300 and the display panel 100. The color adjustment unit 300 includes a third light-transmitting conductive layer 320, a second cholesteric liquid crystal layer 350, a fourth light-transmitting conductive layer 340, and a third substrate 330. The second substrate 240 is located between the third light-transmitting conductive layer 320 and the second light-transmitting conductive layer 250. The third light-transmitting conductive layer 320 is located between the second cholesteric liquid crystal layer 350 and the second substrate 240. The second cholesteric liquid crystal layer 350 is located between the fourth light-transmitting conductive layer 340 and the third light-transmitting conductive layer 320. The fourth light-transmitting conductive layer 340 is located between the third substrate 330 and the second cholesteric liquid crystal layer 350.

[0069] In particular, the pitch of the second cholesteric liquid crystal layer 350 of the color adjustment unit 300 is different from the pitch of the first cholesteric liquid crystal layer 260 of the decorative panel 200. That is to say, the color adjustment unit 300 and the decorative panel 200 can reflect different wavelength ranges. By mixing the first color beam and the second color beam respectively reflected by the decorative panel 200 and the color adjustment unit 300, the display device 10B can present decorative patterns PT of more colors.

[0070] Figure 6 is a schematic cross-sectional view of a display device according to still another embodiment of the present invention. Figure 6 The display device 10C is similar to Figure 4 the display device 10A, and the difference between the two is that: Figure 6 the display device 10C further includes a color adjustment unit 300. Figure 6 The color adjustment unit 300 of Figure 5 is the same as the color adjustment unit 300 of , and thus will not be repeated here.

Claims

1. A decorative panel, comprising: A first substrate; A first transparent conductive layer disposed on the first substrate; A light-transmitting structure disposed on the first substrate, wherein the light-transmitting structure includes a first part and a second part with different heights; A second substrate disposed opposite to the first substrate; A second transparent conductive layer disposed on the second substrate; And A first cholesteric liquid crystal layer disposed between the first transparent conductive layer and the second transparent conductive layer; The decorative panel is adapted to present a decorative pattern, and the decorative pattern corresponds to the light-transmitting structure.

2. The decorative panel according to claim 1, wherein the decorative pattern substantially coincides with the light-transmitting structure.

3. The decorative panel according to claim 1, wherein when the decorative panel is not enabled, the first cholesteric liquid crystal layer is in a reflective state, and the decorative panel presents the decorative pattern.

4. The decorative panel according to claim 1, wherein When the decorative panel is enabled, the first cholesteric liquid crystal layer is in a transmissive state.

5. The decorative panel according to claim 1, wherein the first cholesteric liquid crystal layer has a pitch, the direction is perpendicular to the first substrate, the first transparent conductive layer and the second transparent conductive layer have a maximum distance in this direction, and the ratio of the maximum distance to the pitch falls within the range of 2 to 15.

6. The decorative panel according to claim 1, wherein the direction is perpendicular to the first substrate, the first transparent conductive layer and the second transparent conductive layer have a maximum distance in this direction, the first part and the second part of the light-transmitting structure have a first height and a second height respectively in this direction, the maximum distance is d, the first height is H1, the second height is H2, and d and H1 satisfy: 0 ≤ ((d - H1)) / d < 1, d and H2 satisfy: 0 ≤ ((d - H2)) / d < 1.

7. The decorative panel according to claim 1, wherein the first transparent conductive layer is located between the light-transmitting structure and the first substrate.

8. The decorative panel according to claim 1, wherein the light-transmitting structure is located between the first transparent conductive layer and the first substrate.

9. The decorative panel according to claim 1, further comprising: A third transparent conductive layer, wherein the second substrate is located between the third transparent conductive layer and the second transparent conductive layer; A second cholesteric liquid crystal layer, wherein the third transparent conductive layer is located between the second cholesteric liquid crystal layer and the second substrate; A fourth transparent conductive layer, wherein the second cholesteric liquid crystal layer is located between the fourth transparent conductive layer and the third transparent conductive layer; And A third substrate, wherein the fourth transparent conductive layer is located between the third substrate and the second cholesteric liquid crystal layer; The pitch of the first cholesteric liquid crystal layer is different from the pitch of the second cholesteric liquid crystal layer.

10. A display device, comprising: A display panel; A decorative panel disposed above the display panel, wherein the decorative panel includes: A first substrate; A first transparent conductive layer disposed on the first substrate; A light-transmitting structure disposed on the first substrate, wherein the light-transmitting structure includes a first part and a second part with different heights; A second substrate disposed opposite to the first substrate; A second transparent conductive layer disposed on the second substrate; and A first cholesteric liquid crystal layer is disposed between the first light-transmissive conductive layer and the second light-transmissive conductive layer; wherein the display device is adapted to present a decorative pattern, and the decorative pattern corresponds to the light-transmissive structure.

11. The display device according to claim 10, wherein the decorative pattern substantially coincides with the light-transmissive structure.

12. The display device according to claim 10, wherein when the display device is in the decorative mode, the decorative panel is not enabled, the first cholesteric liquid crystal layer is in a reflective state, and the display device presents the decorative pattern.

13. The display device according to claim 10, wherein when the display device is in the display mode, the decorative panel is enabled, and the first cholesteric liquid crystal layer is in a transmissive state.

14. The display device according to claim 10, wherein the first cholesteric liquid crystal layer has a pitch, the direction is perpendicular to the first substrate, the first light-transmissive conductive layer and the second light-transmissive conductive layer have a maximum distance in this direction, and the ratio of the maximum distance to the pitch falls within the range of 2 to 15.

15. The display device according to claim 10, wherein the direction is perpendicular to the first substrate, the first light-transmissive conductive layer and the second light-transmissive conductive layer have a maximum distance in this direction, the first part and the second part of the light-transmissive structure have a first height and a second height respectively in this direction, the maximum distance is d, the first height is H1, the second height is H2, and d and H1 satisfy: 0 ≤ ((d - H1)) / d < 1, d and H2 satisfy: 0 ≤ ((d - H2)) / d < 1.

16. The display device according to claim 10, wherein the first light-transmissive conductive layer is located between the light-transmissive structure and the first substrate.

17. The display device according to claim 10, wherein the light-transmissive structure is located between the first light-transmissive conductive layer and the first substrate.

18. The display device according to claim 10, further comprising: a third light-transmissive conductive layer, wherein the second substrate is located between the third light-transmissive conductive layer and the second light-transmissive conductive layer; a second cholesteric liquid crystal layer, wherein the third light-transmissive conductive layer is located between the second cholesteric liquid crystal layer and the second substrate; a fourth light-transmissive conductive layer, wherein the second cholesteric liquid crystal layer is located between the fourth light-transmissive conductive layer and the third light-transmissive conductive layer; and a third substrate, wherein the fourth light-transmissive conductive layer is located between the third substrate and the second cholesteric liquid crystal layer; the pitch of the first cholesteric liquid crystal layer is different from the pitch of the second cholesteric liquid crystal layer.

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