Display device

Abstract

A display device (1), comprising: a first selective light reflection assembly (20), configured to reflect first color light (L1); a second selective light reflection assembly (50), provided above the first selective light reflection assembly (20), and configured to reflect second color light (L2) and allow the first color light (L1) to pass through; and a filter assembly (30), provided between the first selective light reflection assembly (20) and the second selective light reflection assembly (50), wherein the wavelength range of light to be absorbed by the filter assembly (30) overlaps the wavelength range of the second color light (L2). According to the display device (1), interfering light reflected by the first selective light reflection assembly (20), excluding the first color light (L1), can be absorbed by means of the filter assembly (30), such that the display color of the display device (1) in a large viewing angle direction has no color cast, thereby improving the purity of the display color.

Description

Display device Technical Field

[0001] The present invention relates to the field of display technology, and more particularly, to a display device. Background Art

[0002] With the increasing popularity of display devices, people's demand for display quality is no longer limited to color quality at standard viewing angles; the demand for color quality at wider viewing angles is also increasing. However, existing display devices have not yet proposed an effective solution to remove the internal interference light generated by their structures. As a result, this interference light causes light mixing at wide viewing angles, resulting in color shift in the displayed colors and, in turn, insufficient color purity.

[0003] Therefore, it is necessary to improve the display device in the prior art to solve the above problems.

[0004] Summary of the Invention

[0005] An object of the present invention is to provide a display device to solve the technical problem of insufficient color purity of display devices in the prior art when displaying at a wide viewing angle.

[0006] According to one embodiment of the present application, the present application provides a display device, which includes: a first selective light reflecting component, which is configured to reflect a first color light; a second selective light reflecting component, which is arranged above the first selective light reflecting component and is configured to reflect a second color light and allow the first color light to pass through; and a filter component, which is arranged between the first selective light reflecting component and the second selective light reflecting component, and the absorption wavelength range of the filter component overlaps with the wavelength range of the second color light.

[0007] According to another embodiment of the present application, the present application provides a display device comprising: a first liquid crystal layer configured to reflect a first color light; a filter layer disposed on the first liquid crystal layer; and a second liquid crystal layer disposed on the filter layer and configured to reflect a second color light having a wavelength range substantially the same as the absorption wavelength range of the filter layer.

[0008] According to another embodiment of the present application, the present application provides a display device, which includes: a first liquid crystal layer, which is configured to reflect a first color light; a filter layer, which is arranged on the first liquid crystal layer, and the absorption wavelength range of the filter layer does not overlap with the wavelength range of the first color light; and a second liquid crystal layer, which is arranged on the filter layer and configured to reflect the second color light and allow the first color light to pass through.

[0009] Compared with the prior art, the present invention has at least the following technical effects:

[0010] The present application provides a display device that, by disposing a filter component (i.e., a filter layer) between a first selective light reflecting component (i.e., a first liquid crystal layer) and a second selective light reflecting component (i.e., a second liquid crystal layer), can absorb interfering light (excluding the first color light) reflected by the first selective light reflecting component (i.e., the first liquid crystal layer). This prevents color shift in the display color of the display device across a wide viewing angle, thereby improving the purity of the displayed color. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The following briefly describes the drawings necessary to describe the embodiments of the present invention or the prior art. Obviously, the drawings described below only represent some embodiments of the present invention. Those skilled in the art can, without requiring creative effort, derive drawings for other embodiments based on the illustrations in these drawings.

[0012] FIG1 is a schematic structural diagram of a display device provided in an embodiment of the present application.

[0013] FIG. 2 is a schematic diagram of a light path of the display device of FIG. 1 .

[0014] FIG3 is a schematic structural diagram of a display device provided in an embodiment of the present application.

[0015] Explanation of symbols: 1: display device; 1a: display device; 20: first selective light reflection component, first liquid crystal layer; 21: conductive substrate; 21a: conductive substrate; 211: substrate; 211a: substrate; 212: electrode layer; 22: conductive substrate; 22a: conductive substrate; 221: substrate; 221a: substrate; 222: electrode layer; 23: first cholesterol liquid crystal; 24: first sealing material; 30: filter component, filter layer; 40: light absorption layer; 50: second selective light reflection component Light-reflecting component, second liquid crystal layer; 51: conductive substrate; 51a: conductive substrate; 511: base material; 511a: base material; 512: electrode layer; 52: conductive substrate; 52a: conductive substrate; 521: base material; 521a: base material; 522: electrode layer; 53: second cholesteric liquid crystal; 54: second sealing material; L1: first color light; L2: second color light; L3: third color light; λ1: wavelength range; λ2: wavelength range; λ3: wavelength range; λ a : Absorption wavelength range of light. DETAILED DESCRIPTION

[0016] In order to better understand the spirit of this application, it is further described below in conjunction with some preferred embodiments of this application.

[0017] Various embodiments of the present application are discussed in detail below. Although specific implementations have been discussed, it should be understood that these embodiments are for illustrative purposes only. Those skilled in the relevant art will recognize that other components and configurations may be used without departing from the spirit and scope of the present application.

[0018] Figure 1 is a schematic diagram of the structure of a display device 1 provided in an embodiment of the present application. Figure 2 is a schematic diagram of the light path of the display device 1 in Figure 1 . As shown in Figures 1 and 2 , the display device 1 includes a first selective light reflecting component 20, a filter component 30, a light absorbing layer 40, and a second selective light reflecting component 50. In some embodiments of the present application, the display device 1 may include, but is not limited to, a liquid crystal display device. The display device 1 may include, but is not limited to, a cholesteric liquid crystal display device.

[0019] The first selective light-reflecting component 20 can be configured to reflect the first color light L1. In some embodiments of the present application, the first selective light-reflecting component 20 can include a first cholesteric liquid crystal 23. Therefore, in some embodiments of the present application, the first selective light-reflecting component 20 can also be referred to as the "first liquid crystal layer 20." In some embodiments of the present application, as shown in Figures 1 and 2, the first selective light-reflecting component 20 (i.e., the first liquid crystal layer 20) can further include a conductive substrate (e.g., a lower conductive substrate) 21, a conductive substrate (e.g., an upper conductive substrate) 22, and a first sealant 24. The first cholesteric liquid crystal 23 can be disposed between the conductive substrate (e.g., the lower conductive substrate) 21 and the conductive substrate (e.g., the upper conductive substrate) 22. The first sealant 24 can surround the first cholesteric liquid crystal 23. The first sealant 24 can seal the first cholesteric liquid crystal 23 together with the conductive substrate (e.g., the lower conductive substrate) 21 and the conductive substrate (e.g., the upper conductive substrate) 22. In some embodiments of the present application, the conductive substrate (e.g., the lower conductive substrate) 21 can include a base material (e.g., a lower base material) 211 and an electrode layer (e.g., a lower electrode layer) 212. The conductive substrate (e.g., upper conductive substrate) 22 may include a substrate (e.g., upper substrate) 221 and an electrode layer (e.g., upper electrode layer) 222. In some embodiments of the present application, the substrate (e.g., lower substrate) 211 and the substrate (e.g., upper substrate) 221 may be glass substrates. The electrode layer (e.g., lower electrode layer) 212 may be disposed on (e.g., upper surface) of the substrate (e.g., lower substrate) 211. The electrode layer (e.g., upper electrode layer) 222 may be disposed on (e.g., lower surface) of the substrate (e.g., upper substrate) 221. In some embodiments of the present application, the electrode layer (e.g., lower electrode layer) 212 and the electrode layer (e.g., upper electrode layer) 222 may include, but are not limited to, indium tin oxide (ITO) electrodes. In some embodiments of the present application, the first selective light reflecting element 20 (i.e., the first liquid crystal layer 20) may determine the rotation direction of the first cholesteric liquid crystal 23 by the voltage difference between the electrode layer (e.g., lower electrode layer) 212 and the electrode layer (e.g., upper electrode layer) 222. In some embodiments of the present application, the first cholesteric liquid crystal 23 can be rotated at an angle or in a parallel state to reflect the first color light L1. When the display device 1 is to display black, the first cholesteric liquid crystal 23 can be in a vertical state, or a focal-conic state, and not reflect the first color light L1.

[0020] The first color light L1 has a wavelength range λ1. The first color light L1 is the color light required for the display device 1 to display colors. In some embodiments of the present application, the first color light L1 may include but is not limited to green light, red light, or yellow light.

[0021] In some embodiments of the present application, the first selective light-reflecting component 20 (i.e., the first liquid crystal layer 20) can reflect third color light L3. The third color light L3 is light traveling toward a wide viewing angle (e.g., a viewing angle greater than or equal to 140°). The third color light L3 can enter the display device 1 at an incident angle greater than or equal to 70°. The third color light L3 has a wavelength range λ3. In some embodiments of the present application, the wavelength range λ3 of the third color light L3 does not overlap with the wavelength range λ1 of the first color light L1.

[0022] The filter assembly 30 may be disposed on the first selective light-reflecting assembly 20 (i.e., the first liquid crystal layer 20). In some embodiments of the present application, the filter assembly 30 may also be referred to as the "filter layer 30." In some embodiments of the present application, the first cholesteric liquid crystal 23 of the first selective light-reflecting assembly 20 (i.e., the first liquid crystal layer 20) may reflect the first color light L1 toward the filter assembly 30 (i.e., the filter layer 30).

[0023] The light absorbing layer 40 may be disposed below the first selective light reflecting component 20 (i.e., the first liquid crystal layer 20). The light absorbing layer 40 may be configured to absorb non-reflected light (including, for example, light not reflected by the first selective light reflecting component 20). In some embodiments of the present application, as shown in FIG1 and FIG2 , the light absorbing layer 40 may be separated from the light filtering component 30 (i.e., the light filtering layer 30) by the first selective light reflecting component 20 (i.e., the first liquid crystal layer 20).

[0024] The second selective light-reflecting component 50 may be disposed above the first selective light-reflecting component 20 (i.e., the first liquid crystal layer 20). The second selective light-reflecting component 50 may be configured to reflect the second color light L2. The second selective light-reflecting component 50 allows the first color light L1 to pass through. In some embodiments of the present application, the second selective light-reflecting component 50 may include a second cholesteric liquid crystal 53. Therefore, in some embodiments of the present application, the second selective light-reflecting component 50 may also be referred to as the "second liquid crystal layer 50." In some embodiments of the present application, as shown in Figures 1 and 2, the second selective light-reflecting component 50 (i.e., the second liquid crystal layer 50) may further include a conductive substrate (e.g., a lower conductive substrate) 51, a conductive substrate (e.g., an upper conductive substrate) 52, and a second sealing material 54. The second cholesteric liquid crystal 53 may be disposed between the conductive substrate (e.g., the lower conductive substrate) 51 and the conductive substrate (e.g., the upper conductive substrate) 52. The second sealing material 54 may surround the second cholesteric liquid crystal 53. The second sealing material 54, together with the conductive substrate (e.g., the lower conductive substrate) 51 and the conductive substrate (e.g., the upper conductive substrate) 52, may seal the second cholesteric liquid crystal 53. In some embodiments of the present application, a conductive substrate (e.g., a lower conductive substrate) 51 may include a base material (e.g., a lower base material) 511 and an electrode layer (e.g., a lower electrode layer) 512. A conductive substrate (e.g., an upper conductive substrate) 52 may include a base material (e.g., an upper base material) 521 and an electrode layer (e.g., an upper electrode layer) 522. In some embodiments of the present application, the base material (e.g., the lower base material) 511 and the base material (e.g., the upper base material) 521 may be glass substrates. The electrode layer (e.g., the lower electrode layer) 512 may be disposed on the base material (e.g., the lower base material) 511 (e.g., the upper surface). The electrode layer (e.g., the upper electrode layer) 522 may be disposed on the base material (e.g., the upper base material) 521 (e.g., the lower surface). In some embodiments of the present application, the electrode layer (e.g., the lower electrode layer) 512 and the electrode layer (e.g., the upper electrode layer) 522 may include, but are not limited to, indium tin oxide (ITO) electrodes. In some embodiments of the present application, the second selective light-reflecting element 50 (i.e., the second liquid crystal layer 50) can determine the rotation direction of the second cholesteric liquid crystal 53 by using the voltage difference between the electrode layer (e.g., the lower electrode layer) 512 and the electrode layer (e.g., the upper electrode layer) 522. In some embodiments of the present application, the second cholesteric liquid crystal 53 can be rotated at an angle or assume a parallel orientation to reflect the second color light L2. When the display device 1 is intended to display black, the second cholesteric liquid crystal 53 can assume a homeotropic orientation, or a focal-conic state, and not reflect the second color light L2.

[0025] In some embodiments of the present application, the second selective light-reflecting component 50 (i.e., the second liquid crystal layer 50) may be disposed on the filter component 30 (i.e., the filter layer 30), such that the filter component 30 (i.e., the filter layer 30) is located or disposed between the first selective light-reflecting component 20 (i.e., the first liquid crystal layer 20) and the second selective light-reflecting component 50 (i.e., the second liquid crystal layer 50). In some embodiments of the present application, the filter component 30 (i.e., the filter layer 30) may contact the first selective light-reflecting component 20 (i.e., the first liquid crystal layer 20). In some embodiments of the present application, the filter component 30 (i.e., the filter layer 30) may contact the conductive substrate 22. In some embodiments of the present application, the filter component 30 (i.e., the filter layer 30) may contact the second selective light-reflecting component 50 (i.e., the second liquid crystal layer 50). In some embodiments of the present application, the filter component 30 (i.e., the filter layer 30) may contact the conductive substrate 51. In some embodiments of the present application, the second cholesteric liquid crystal 53 of the second selective light reflector 50 (i.e., the second liquid crystal layer 50) can reflect the second color light L2 in a direction opposite to that of the filter element 30 (i.e., the filter layer 30). Furthermore, the filter element 30 (i.e., the filter layer 30) is structurally located between the first cholesteric liquid crystal 23 and the second cholesteric liquid crystal 53.

[0026] The second color light L2 has a wavelength range λ2. The second color light L2 is the color light required for the display device 1 to display colors. In some embodiments of the present application, the wavelength range λ2 of the second color light L2 may be numerically smaller (including, for example, the upper and lower limits of the wavelength range) than the wavelength range λ1 of the first color light L1. In some embodiments of the present application, the second color light L2 may include, but is not limited to, blue light, cyan light, or green light.

[0027] In some embodiments of the present application, the display device 1 can display colors separately or in combination using the first color light L1 reflected by the first selective light reflecting element 20 (i.e., the first liquid crystal layer 20) and the second color light L2 reflected by the second selective light reflecting element 50 (i.e., the second liquid crystal layer 50). However, when the display device 1 displays a single color using only the first color light L1 reflected by the first selective light reflecting element 20 (i.e., the first liquid crystal layer 20), and the wavelength range λ3 of the third color light L3 overlaps with or is substantially the same as the wavelength range λ2 of the second color light L2, the third color light L3 may mix with the first color light L1 at wide viewing angles (e.g., viewing angles greater than or equal to 140°), resulting in insufficient purity of the displayed single color (i.e., a color shift).

[0028] The filter element 30 (ie, the filter layer 30) has an absorption wavelength range λ a In some embodiments of the present application, the absorption wavelength range of the filter component 30 (ie, the filter layer 30) is λ aThe wavelength range λ3 of the third color light L3 may overlap or be substantially the same as that of the third color light L3 to absorb the third color light L3 and prevent the third color light L3 from interfering with the color display of the display device 1 in a wide viewing angle (eg, viewing angle greater than or equal to 140°).

[0029] Considering that the above-mentioned situation of insufficient monochromatic purity (i.e., color cast) is likely to occur when the wavelength range λ3 of the third color light L3 overlaps or is substantially the same as the wavelength range λ2 of the second color light L2, the absorption wavelength range λ of the filter element 30 (i.e., the filter layer 30) is a On the other hand, in order to allow the filter element 30 (i.e., the filter layer 30) to allow the first color light L1 to pass through (i.e., not absorb the first color light L1), the absorption wavelength range λ of the filter element 30 (i.e., the filter layer 30) is a The wavelength range λ1 of the first color light L1 does not overlap with the wavelength range λ1 of the first color light L1 to prevent the first color light L1 from being absorbed. In some embodiments of the present application, the absorption wavelength range λ of the filter element 30 (ie, the filter layer 30) is a The value (including, for example, the upper limit and the lower limit of the wavelength range) of the wavelength range may be smaller than the wavelength range λ1 of the first color light L1 .

[0030] In some embodiments of the present application, the filter component 30 (i.e., the filter layer 30 ) may include, but is not limited to, an optically clear adhesive (OCA). The OCA may absorb the third color light L3 . The OCA may allow the first color light L1 to pass through (i.e., not absorb the first color light L1 ).

[0031] In the embodiment shown in Figures 1 and 2 , the display device 1 effectively absorbs the third color light L3 reflected by the first selective light reflecting element 20 (i.e., the first liquid crystal layer 20) by disposing a filter element 30 (i.e., a filter layer 30) between the first selective light reflecting element 20 (i.e., the first liquid crystal layer 20) and the second selective light reflecting element 50 (i.e., the second liquid crystal layer 50). Without interference from the third color light L3, the display device 1 exhibits no color shift across wide viewing angles (e.g., a viewing angle greater than or equal to 140°), thereby enhancing the purity of the displayed colors.

[0032] The present application further uses the following embodiment and FIG. 2 to illustrate the operation of the display device 1 performing color display through the first selective light reflecting component 20 (i.e., the first liquid crystal layer 20 ), the filter component 30 (i.e., the filter layer 30 ), and the second selective light reflecting component 50 (i.e., the second liquid crystal layer 50 ).

[0033] Example 1

[0034] The first color light L1 reflected by the first selective light reflecting component 20 (ie, the first liquid crystal layer 20 ) is green light, and its wavelength range λ1 is 501 nm to 590 nm;

[0035] The second color light L2 reflected by the second selective light reflection element 50 (ie, the second liquid crystal layer 50 ) is blue light, and its wavelength range λ2 is 415 nm to 500 nm; and

[0036] The absorption wavelength range of the filter element 30 (ie, the filter layer 30) is λ a 415nm to 500nm.

[0037] With the above configuration, the display device of Example 1 can generate colors including at least green, blue, cyan, and black. Furthermore, after measurement with a color analyzer, no color shift occurs, indicating that color purity has been improved.

[0038] Example 2

[0039] The first color light L1 reflected by the first selective light reflecting component 20 (ie, the first liquid crystal layer 20 ) is red light, and its wavelength range λ1 is 590 nm to 740 nm;

[0040] The second color light L2 reflected by the second selective light reflection element 50 (ie, the second liquid crystal layer 50 ) is blue light, and its wavelength range λ2 is 415 nm to 500 nm; and

[0041] The absorption wavelength range of the filter element 30 (ie, the filter layer 30) is λ a 415nm to 500nm.

[0042] With the above configuration, the display device of Example 2 can generate colors including at least red, blue, magenta, and black. Furthermore, after measurement with a color analyzer, no color shift occurs, indicating that color purity has been improved.

[0043] Example 3

[0044] The first color light L1 reflected by the first selective light reflecting component 20 (i.e., the first liquid crystal layer 20 ) is red light, and its wavelength range λ1 is 591 nm to 740 nm;

[0045] The second color light L2 reflected by the second selective light reflecting element 50 (ie, the second liquid crystal layer 50 ) is green light, and its wavelength range λ2 is 500 nm to 590 nm; and

[0046] The absorption wavelength range of the filter element 30 (ie, the filter layer 30) is λ a 500nm to 590nm.

[0047] With the above configuration, the display device of Example 3 can generate colors including at least green, red, yellow, and black. Furthermore, after measurement with a color analyzer, no color shift occurs, indicating that color purity has been improved.

[0048] Example 4

[0049] The first color light L1 reflected by the first selective light reflecting component 20 (ie, the first liquid crystal layer 20 ) is yellow light, and its wavelength range λ1 is 520 nm to 640 nm;

[0050] The second color light L2 reflected by the second selective light reflection element 50 (ie, the second liquid crystal layer 50 ) is blue light, and its wavelength range λ2 is 415 nm to 500 nm; and

[0051] The absorption wavelength range of the filter element 30 (ie, the filter layer 30) is λ a 415nm to 500nm.

[0052] With the above configuration, the display device of Example 4 can generate colors including at least yellow, blue, white, and black. Furthermore, after measurement with a color analyzer, no color shift occurs, indicating that color purity has been improved.

[0053] Example 5

[0054] The first color light L1 reflected by the first selective light reflecting component 20 (ie, the first liquid crystal layer 20 ) is red light, and its wavelength range λ1 is 590 nm to 740 nm;

[0055] The second color light L2 reflected by the second selective light reflecting element 50 (ie, the second liquid crystal layer 50 ) is cyan light, and its wavelength range λ2 is 460 nm to 550 nm; and

[0056] The absorption wavelength range of the filter element 30 (ie, the filter layer 30) is λ a 460nm to 550nm.

[0057] With the above configuration, the display device of Example 5 can generate colors including at least cyan, red, white, and black. Furthermore, after measurement with a color analyzer, no color shift occurs, indicating that color purity has been improved.

[0058] Example 6

[0059] The first color light L1 reflected by the first selective light reflecting component 20 (ie, the first liquid crystal layer 20 ) is yellow light, and its wavelength range λ1 is 520 nm to 640 nm;

[0060] The second color light L2 reflected by the second selective light reflecting element 50 (ie, the second liquid crystal layer 50 ) is cyan light, and its wavelength range λ2 is 460 nm to 550 nm; and

[0061] The absorption wavelength range of the filter element 30 (ie, the filter layer 30) is λ a 460nm to 550nm.

[0062] With the above configuration, the display device of Example 6 can generate colors including at least yellow, cyan, white, and black. Furthermore, after measurement with a color analyzer, no color shift occurs, indicating that color purity has been improved.

[0063] The operating conditions and color measurement results of Examples 1 to 6 of the present application are summarized in Table 1 below.

[0064] Table 1. Operating conditions and color measurement results of Examples 1 to 6

[0065] FIG3 is a schematic diagram of the structure of a display device 1a provided in an embodiment of the present application. The display device 1a of FIG3 has a similar structure to the display device 1 of FIG1 , except that the substrate 211a of the conductive substrate 21a, the substrate 221a of the conductive substrate 22a, the substrate 511a of the conductive substrate 51a, and the substrate 521a of the conductive substrate 52a in FIG3 are flexible substrates.

[0066] While the technical content and features of the present invention have been disclosed above, those skilled in the art may still make various substitutions and modifications based on the teachings and disclosures of the present invention without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited to the contents disclosed in the embodiments, but should include various substitutions and modifications that do not depart from the present invention, and should be covered by the claims of this patent application.

Claims

1. A display device comprising: a first selective light reflecting component configured to reflect a first color of light; a second selective light reflecting component disposed above the first selective light reflecting component and configured to reflect the second color light and allow the first color light to pass through; as well as The filter component is disposed between the first selective light reflecting component and the second selective light reflecting component, and the wavelength range of the light absorbed by the filter component overlaps with the wavelength range of the second color light. 2 . The display device as claimed in claim 1 , wherein the wavelength range of the light absorbed by the filter component is substantially the same as the wavelength range of the second color light. 3 . The display device as claimed in claim 1 , wherein the wavelength range of the light absorbed by the filter element does not overlap with the wavelength range of the first color light. 4 . The display device as claimed in claim 3 , wherein the wavelength range of the light absorbed by the filter component is smaller than the wavelength range of the first color light. 5 . The display device of claim 3 , wherein the wavelength range of the second color light is smaller in value than the wavelength range of the first color light. The display device as claimed in claim 1 , wherein the filter component contacts the first selective light reflection component.

7. The display device as claimed in claim 1, wherein the filter component contacts the second selective light reflection component. The display device as claimed in claim 1 , wherein the filter assembly comprises optically transparent adhesive.

9. The display device according to claim 1, further comprising: The light absorbing layer is disposed below the first selective light reflecting component and is configured to absorb light that is not reflected.

10. The display device of claim 9, wherein the light absorbing layer is separated from the light filtering component by the first selective light reflecting component.

11. The display device as claimed in claim 1, wherein the first selective light reflecting component reflects the first color light toward the filter component, and the second selective light reflecting component reflects the second color light in a direction opposite to the filter component.

12. A display device comprising: a first liquid crystal layer configured to reflect a first color light; a filter layer disposed on the first liquid crystal layer; as well as The second liquid crystal layer is disposed on the filter layer and is configured to reflect a second color light having a wavelength range substantially the same as the wavelength range of the light absorbed by the filter layer.

13. The display device of claim 12, wherein the first liquid crystal layer comprises a first cholesteric liquid crystal, the first cholesteric liquid crystal reflects the first color light toward the filter layer, and the filter layer does not absorb the first color light.

14. The display device of claim 13, wherein the second liquid crystal layer comprises a second cholesteric liquid crystal, the second cholesteric liquid crystal reflects the second color light in a direction opposite to the filter layer, and the filter layer is located between the first cholesteric liquid crystal and the second cholesteric liquid crystal. 15 . The display device according to claim 12 , wherein the wavelength range of the light absorbed by the filter layer is smaller than the wavelength range of the first color light.

16. A display device comprising: a first liquid crystal layer configured to reflect a first color light; a filter layer disposed on the first liquid crystal layer, wherein the filter layer has an absorption wavelength range that does not overlap with the wavelength range of the first color light; as well as The second liquid crystal layer is disposed on the filter layer and is configured to reflect the second color light and allow the first color light to pass through. 17 . The display device of claim 16 , wherein the first liquid crystal layer further reflects a third color light, a wavelength range of the third color light does not overlap with the wavelength range of the first color light, and the filter layer absorbs the third color light. The display device of claim 17 , wherein the wavelength range of the third color light overlaps with the wavelength range of the second color light. 19 . The display device of claim 18 , wherein the absorption wavelength range of the filter layer, the wavelength range of the third color light, and the wavelength range of the second color light are substantially the same. 20 . The display device as claimed in claim 17 , wherein the filter layer comprises an optically transparent adhesive, and the optically transparent adhesive absorbs the third color light and allows the first color light to pass through.

Images