A double-sided reflective display panel

Abstract

This application provides a double-sided reflective display panel, including a first dimming liquid crystal cell, a first transflective layer, a second transflective layer, and a second dimming liquid crystal cell arranged sequentially. By setting the first transflective layer and the second transflective layer between the first dimming liquid crystal cell and the second dimming liquid crystal cell, since the first light transmission axis of the first transflective layer is parallel to the second light reflection axis of the second transflective layer, and the second light transmission axis of the second transflective layer is parallel to the first light reflection axis of the first transflective layer, when the double-sided reflective display panel is displaying an image, light rays with polarization directions parallel to the first light reflection axis can be reflected and utilized by the first transflective layer, and light rays with polarization directions parallel to the second light reflection axis can be reflected and utilized by the second transflective layer, thereby improving the utilization rate of ambient light and enhancing display brightness and display effect.

Description

Technical Field

[0001] This application relates to the field of display panel technology, and more particularly to a double-sided reflective display panel. Background Technology

[0002] Liquid Crystal Display (LCD) technology maintains a dominant position in the display market due to its excellent performance and comprehensive technological system. Based on different light source utilization methods, LCD technology is finely divided into three main categories: transmissive, reflective, and transflective-reflective (or semi-transmissive-reflective). In particular, reflective and transflective LCD devices exhibit unique advantages in outdoor applications. They can efficiently utilize ambient light, meeting display requirements by reflecting external light, thus reducing reliance on internal light sources, enhancing visual clarity in outdoor environments, and achieving energy savings.

[0003] However, most mainstream reflective display panels on the market are currently limited to single-sided displays, a limitation that restricts their application potential in various fields. Especially in public spaces such as digital billboards, communication electronic equipment, point-of-sale terminals, information service windows, and exhibition halls, display devices often need to transmit information in two directions simultaneously to accommodate the viewing needs of audiences in different positions. For example, in exhibition halls, a display panel with double-sided display capabilities can show content to both sides of the exhibition area simultaneously, eliminating the need for audiences to move or gather on one side, significantly improving the speed of information dissemination and the visitor experience. Summary of the Invention

[0004] This application provides a double-sided reflective display panel, which can improve the utilization of ambient light to enhance display brightness and display effect, and also reduce power consumption and save energy.

[0005] To achieve the above objectives, this application provides a double-sided reflective display panel, comprising a first dimming liquid crystal cell, a first transmissive layer, a second transmissive layer, and a second dimming liquid crystal cell arranged sequentially, wherein:

[0006] The first dimming liquid crystal cell includes a first substrate, a first opposing substrate disposed opposite to the first substrate, and a first cholesteric liquid crystal layer disposed between the first substrate and the first opposing substrate. The first opposing substrate is adjacent to the first transflective layer. A first control electrode is disposed on the first substrate adjacent to the first cholesteric liquid crystal layer. A first color resist layer is disposed on the side of the first substrate close to the first control electrode. The first color resist layer is used to selectively transmit a first preset color. A second control electrode is disposed on the first opposing substrate adjacent to the first cholesteric liquid crystal layer. The first cholesteric liquid crystal layer includes first cholesteric liquid crystal and is used to transmit or reflect light.

[0007] The second dimming liquid crystal cell includes a second substrate, a second opposing substrate disposed opposite to the second substrate, and a second cholesteric liquid crystal layer disposed between the second substrate and the second opposing substrate. The second opposing substrate is adjacent to the second transflective layer. A third control electrode is provided on the second substrate adjacent to the second cholesteric liquid crystal layer. A second color resist layer is provided on the side of the second substrate close to the third control electrode. The second color resist layer is used to selectively transmit a second preset color. A fourth control electrode is provided on the second opposing substrate adjacent to the second cholesteric liquid crystal layer. The second cholesteric liquid crystal layer includes a second cholesteric liquid crystal. The second dimming liquid crystal cell is used to transmit or reflect light.

[0008] The first transflective layer has a first light transmission axis and a first light reflection axis. The first transflective layer can transmit light parallel to the first light transmission axis and reflect light parallel to the first light reflection axis. The second transflective layer has a second light transmission axis and a second light reflection axis. The second transflective layer can transmit light parallel to the second light transmission axis and reflect light parallel to the second light reflection axis. The first light transmission axis and the second light reflection axis are parallel to each other, and the second light transmission axis and the first light reflection axis are parallel to each other.

[0009] As a further improvement of this application, the first cholesteric liquid crystal has a transparent state, a focal conic state, and a planar textured state;

[0010] When the first cholesteric liquid crystal is in a planar textured state, the first cholesteric liquid crystal can reflect light of a specific color;

[0011] When the first cholesteric liquid crystal is in a transparent state, the first cholesteric liquid crystal has the function of transmitting light;

[0012] When the first cholesteric liquid crystal is in a focal conic state, the first cholesteric liquid crystal can scatter light and increase the emission angle of the light.

[0013] And / or, the second cholesteric liquid crystal has a transparent state, a focal conic state, and a planar textured state;

[0014] When the second cholesteric liquid crystal is in a planar textured state, the second cholesteric liquid crystal can reflect light of a specific color;

[0015] When the second cholesteric liquid crystal is in a transparent state, the second cholesteric liquid crystal has the function of transmitting light;

[0016] When the second cholesteric liquid crystal is in a focal conic state, it can scatter light and increase the emission angle of the light.

[0017] As a further improvement of this application, the double-sided reflective display panel is provided with multiple pixel units arranged in an array.

[0018] The first color resist layer includes a plurality of first color resist blocks, a plurality of second color resist blocks, and a plurality of first colorless resist regions arranged in an array. The plurality of first color resist blocks, the plurality of second color resist blocks, and the plurality of first colorless resist regions are respectively located in a plurality of pixel units. The first color resist blocks selectively transmit light of a first color, the second color resist blocks selectively transmit light of a second color, the first colorless resist regions transmit light of various colors, and the area of ​​the first cholesteric liquid crystal layer corresponding to the first colorless resist region reflects light of a third color. The second control electrode includes a plurality of first pixel electrodes arranged in an array. The plurality of first pixel electrodes are located in a plurality of pixel units.

[0019] And / or, the second color resist layer includes a plurality of third color resist blocks, a plurality of fourth color resist blocks, and a plurality of second colorless resist regions arranged in an array. The plurality of third color resist blocks, the plurality of fourth color resist blocks, and the plurality of second colorless resist regions are respectively located within a plurality of the pixel units. The third color resist blocks selectively transmit light of a first color, the fourth color resist blocks selectively transmit light of a second color, the second colorless resist regions transmit light of various colors, and the region of the second cholesteric liquid crystal layer corresponding to the second colorless resist region reflects light of a third color. The fourth control electrode includes a plurality of second pixel electrodes arranged in an array. The plurality of second pixel electrodes are located within a plurality of the pixel units.

[0020] As a further improvement of this application, any one of the first color light, the second color light, and the third color light is red light, another is green light, and yet another is blue light.

[0021] As a further improvement of this application, when the cholesteric liquid crystals corresponding to the plurality of first color blocks and the plurality of second color blocks are in a transparent state or a focal cone state, the cholesteric liquid crystals corresponding to the plurality of first colorless regions are in a planar textured state.

[0022] And / or, when the cholesteric liquid crystals corresponding to the plurality of third color blocks and the plurality of fourth color blocks are in a transparent state or a focal cone state, the cholesteric liquid crystals corresponding to the plurality of second colorless blocking regions are in a planar textured state.

[0023] As a further improvement of this application, the first cholesteric liquid crystal layer includes a first dye liquid crystal, the first dye liquid crystal and the first cholesteric liquid crystal exhibit the same color under preset conditions; and / or, the second cholesteric liquid crystal layer includes a second dye liquid crystal, the second dye liquid crystal and the second cholesteric liquid crystal exhibit the same color under preset conditions.

[0024] As a further improvement of this application, a first black substrate is disposed on the first pixel electrode corresponding to the first colorless resistive region, and the first black substrate is adjacent to the first opposing substrate.

[0025] And / or, a second black substrate is disposed on the second pixel electrode corresponding to the second colorless resistive region, the second black substrate being adjacent to the second opposing substrate.

[0026] As a further improvement of this application, when the cholesteric liquid crystals corresponding to the plurality of first color blocks and the plurality of second color blocks exhibit a planar textured state, the cholesteric liquid crystals corresponding to the plurality of first colorless regions exhibit a transparent state or a focal cone state.

[0027] And / or, when the cholesteric liquid crystals corresponding to the plurality of third color blocks and the plurality of fourth color blocks exhibit a planar textured state, the cholesteric liquid crystals corresponding to the plurality of second colorless blocking regions exhibit a transparent state or a focal cone state.

[0028] As a further improvement of this application, both the first and second reflective layers are APF films or metal wire grid polarizers.

[0029] As a further improvement of this application, the first substrate, the first opposing substrate, the second substrate, and the second opposing substrate are all made of transparent glass or transparent plastic, and the first control electrode, the second control electrode, the third control electrode, and the fourth control electrode are all made of transparent conductive material.

[0030] The beneficial effects of this application are as follows: The double-sided reflective display panel provided by this invention, by setting a first transflective layer and a second transflective layer between a first dimming liquid crystal cell and a second dimming liquid crystal cell, since the first light transmission axis of the first transflective layer is parallel to the second light reflection axis of the second transflective layer, and the second light transmission axis of the second transflective layer is parallel to the first light reflection axis of the first transflective layer, when the double-sided reflective display panel is displaying an image, light with a polarization direction parallel to the first light reflection axis can be reflected and utilized by the first transflective layer, and light with a polarization direction parallel to the second light reflection axis can be reflected and utilized by the second transflective layer, thereby improving the utilization rate of ambient light and enhancing the display brightness and display effect. Furthermore, the first dimming liquid crystal cell and the second dimming liquid crystal cell respectively have a first cholesteric liquid crystal and a second cholesteric liquid crystal, and the cholesteric liquid crystal can switch between different states, reducing energy consumption. Attached Figure Description

[0031] Figure 1 This is a cross-sectional schematic diagram of a state of the double-sided reflective display panel according to an embodiment of the present invention;

[0032] Figure 2 This is a cross-sectional schematic diagram of another state of the double-sided reflective display panel according to an embodiment of the present invention;

[0033] Figure 3 This is a cross-sectional schematic diagram of another state of the double-sided reflective display panel according to an embodiment of the present invention;

[0034] Figure 4 This is a cross-sectional schematic diagram of another state of the double-sided reflective display panel according to an embodiment of the present invention.

[0035] In the figure: 1. First dimming liquid crystal cell; 2. First transflective layer; 3. Second transflective layer; 4. Second dimming liquid crystal cell; 11. First substrate; 12. First opposing substrate; 13. First control electrode; 14. Second control electrode; 15. First cholesteric liquid crystal layer; 16. First color resist layer; 21. Second substrate; 22. Second opposing substrate; 23. Third control electrode; 24. Fourth control electrode; 25. Second cholesteric liquid crystal layer; 26. Second color resist layer. Detailed Implementation

[0036] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0037] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and claims of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0038] The directional terms such as "up," "down," "left," "right," "front," "back," "top," and "bottom" (if present) used in the specification and claims of this invention are defined by the position of the structures in the drawings and the relative positions of the structures, and are only for the clarity and convenience of expressing the technical solution. It should be understood that the use of directional terms should not limit the scope of protection claimed in this application.

[0039] Example 1

[0040] Figure 1 This is a cross-sectional schematic diagram of a state of the double-sided reflective display panel according to an embodiment of the present invention; as shown. Figure 1 As shown, this embodiment provides a double-sided reflective display panel that uses ambient light as its light source. It includes a first dimming liquid crystal cell 1, a first transflective layer 2, a second transflective layer 3, and a second dimming liquid crystal cell 4, arranged sequentially.

[0041] The first dimming liquid crystal cell 1 includes a first substrate 11, a first opposing substrate 12 disposed opposite to the first substrate 11, and a first cholesteric liquid crystal layer 15 disposed between the first substrate 11 and the first opposing substrate 12. The first opposing substrate 12 is adjacent to the first transflective layer 2. The first substrate 11 adjacent to the first cholesteric liquid crystal layer 15 is provided with a first control electrode 13. The first substrate 11 is provided with a first color resist layer 16 on the side near the first control electrode 13. The first color resist layer 16 is used to select the transmission of a first preset color. The first opposing substrate 12 adjacent to the first cholesteric liquid crystal layer 15 is provided with a second control electrode 14. The first cholesteric liquid crystal layer 15 includes first cholesteric liquid crystal and is used to transmit or reflect light.

[0042] The second dimming liquid crystal cell 4 includes a second substrate 21, a second opposing substrate 22 disposed opposite to the second substrate 21, and a second cholesteric liquid crystal layer 25 disposed between the second substrate 21 and the second opposing substrate 22. The second opposing substrate 22 is adjacent to the second transflective layer 3. A third control electrode 23 is provided on the second substrate 21 adjacent to the second cholesteric liquid crystal layer 25. A second color resist layer 26 is provided on the side of the second substrate 21 near the third control electrode 23. The second color resist layer 26 is used to selectively transmit a second preset color. A fourth control electrode 24 is provided on the second opposing substrate 22 adjacent to the second cholesteric liquid crystal layer 25. The second cholesteric liquid crystal layer 25 includes second cholesteric liquid crystal. The second dimming liquid crystal cell 4 is used to transmit or reflect light.

[0043] Both the first transflective layer 2 and the second transflective layer 3 are capable of transmitting and reflecting light with a specific polarization direction. The first transflective layer 2 has a first transmission axis and a first reflection axis. The first transflective layer 2 is capable of transmitting light parallel to the first transmission axis and reflecting light parallel to the first reflection axis. The second transflective layer 3 has a second transmission axis and a second reflection axis. The second transflective layer 3 is capable of transmitting and reflecting light parallel to the second transmission axis. The first transmission axis and the second reflection axis are parallel to each other, and the second transmission axis and the first reflection axis are parallel to each other.

[0044] Specifically, the working principle of the double-sided reflective display panel is as follows: both the first reflective layer 2 and the second reflective layer 3 are APF (Advance Polarizer Film) films, i.e., reflective polarizing ultra-thin optical films. The first light transmission axis of the first reflective layer 2 is 0° and the first light reflection axis is 90°. The second light transmission axis of the second reflective layer 3 is 90° and the second light reflection axis is 0° (of course, in other embodiments, the first light transmission axis, the first light reflection axis, the second light transmission axis and the second light reflection axis can also be other angles, as long as the first light transmission axis and the second light reflection axis are parallel to each other, and the second light transmission axis and the first light reflection axis are parallel to each other).

[0045] When the first dimming liquid crystal cell 1 is displaying an image (i.e., displaying an image on the upper side of the double-sided reflective display panel), the first cholesteric liquid crystal layer 15 in the first dimming liquid crystal cell 1 is in a transparent state, a focal conic state, or a planar textured state. The incident light (ambient light) passes through the first color resist layer 16, the first cholesteric liquid crystal layer 15, and the first transflective layer 2 in sequence. When passing through the first transflective layer 2, the light with a polarization direction of 90° is reflected by the first transflective layer 2, and the light with a polarization direction of 0° passes through the first transflective layer 2 and reaches the second transflective layer 3, where it is reflected. This allows light with polarization directions of 0° and 90° to be reflected and utilized, thereby improving the utilization rate of ambient light and enhancing the display brightness and display effect.

[0046] Similarly, when the second dimming liquid crystal cell 4 is displaying an image (i.e., displaying an image on the lower side of the double-sided reflective display panel), the second cholesteric liquid crystal layer 25 within the second dimming liquid crystal cell 4 is in a transparent state, a focal conic state, or a planar textured state. Incident light (ambient light) passes sequentially through the second color resist layer 26, the second cholesteric liquid crystal layer 25, and the second reflective layer 3. When passing through the second reflective layer 3, light with a polarization direction of 0° is reflected by the second reflective layer 3, while light with a polarization direction of 90° passes through the second reflective layer 3 and reaches the first reflective layer 2, where it is reflected. This allows light with polarization directions of 0° and 90° to be reflected and utilized, thereby improving the utilization rate of ambient light and enhancing display brightness and display effect. Of course, in other embodiments, the first reflective layer 2 and the second reflective layer 3 can also be metal wire grid polarizers.

[0047] In an optional embodiment, the first cholesteric liquid crystal has a transparent state, a focal conic state, and a planar textured state, and can switch between the three states. When the first cholesteric liquid crystal is in the focal conic state (i.e., FC focal conic state), it can scatter light, increase the emission angle of the light, and thus increase the viewing angle range. (It should be noted that for the first dimming liquid crystal cell 1, the light reflected by the first reflective layer 2 and the second reflective layer 3 can be scattered by the first cholesteric liquid crystal layer 15; for the second dimming liquid crystal cell 4, the light reflected by the first reflective layer 2 and the second reflective layer 3 can be scattered by the second cholesteric liquid crystal layer 25). When the first cholesteric liquid crystal is in the transparent state (i.e., H-field nematic phase state), it has the function of transmitting light (at this time, it cannot scatter light), that is, the light can directly pass through the first cholesteric liquid crystal layer 15. When the first cholesteric liquid crystal is in a planar textured state (i.e., P state), the first cholesteric liquid crystal can reflect light of a specific color, that is, the first dimming liquid crystal cell 1 can achieve the function of reflecting light of a specific color.

[0048] Similarly, the second cholesteric liquid crystal also has a transparent state, a focal conic state, and a planar textured state, and can switch between these three states. When the second cholesteric liquid crystal is in the focal conic state (i.e., FC focal conic state), it can scatter light, increasing the light emission angle and thus increasing the viewing angle. When the second cholesteric liquid crystal is in the transparent state (i.e., H-field nematic phase state), it has the function of transmitting light (at this time, it cannot scatter light), that is, light can directly pass through the second cholesteric liquid crystal layer 25. When the second cholesteric liquid crystal is in the planar textured state (i.e., P state), it can reflect light of a specific color, that is, the second dimming liquid crystal cell 4 can achieve the function of reflecting light of a specific color. In addition, the FC focal conic state is a stable state and does not require long-term power supply. When the first cholesteric liquid crystal and / or the second cholesteric liquid crystal are in the focal conic state, the double-sided reflective display panel is in a low-power energy-saving mode.

[0049] Specifically, in this embodiment, when both the first cholesteric liquid crystal and the second cholesteric liquid crystal exhibit a focal conic state, a transmissive state, or a planar textured state, the double-sided reflective display panel displays an image. The first dimming liquid crystal cell 1 displays a first preset color selected by the first color resist layer 16, and the second dimming liquid crystal cell 4 displays a second preset color selected by the second color resist layer 26. The difference lies in the fact that the brightness and angle of the image displayed by the double-sided reflective display panel are inconsistent in the three states. The first preset color and the second preset color can be the same or different. In this embodiment, the first color resist layer 16 can absorb colors other than red light, and the second color resist layer 26 can absorb colors other than red light. Therefore, the first dimming liquid crystal cell 1 displays red, the second dimming liquid crystal cell 4 displays red, and the double-sided reflective display panel can display a single red color display. In other embodiments, by changing different color resist layers, the dimming liquid crystal cells can also display other colors of light, such as blue light, green light, etc.

[0050] In optional embodiments, the first substrate 11, the first opposing substrate 12, the second substrate 21, and the second opposing substrate 22 can be made of transparent glass, transparent plastic, or other materials. The first control electrode 13, the second control electrode 14, the third control electrode 23, and the fourth control electrode 24 can be made of transparent conductive materials, such as indium tin oxide (ITO), indium zinc oxide (IZO), or aluminum zinc oxide.

[0051] This invention also provides a display device, including the above-described double-sided reflective display panel.

[0052] The double-sided reflective display panel provided in this embodiment of the invention, by setting a first reflective layer 2 and a second reflective layer 3 between a first dimming liquid crystal cell 1 and a second dimming liquid crystal cell 4, since the first light transmission axis of the first reflective layer 2 is parallel to the second light reflection axis of the second reflective layer 3, and the second light transmission axis of the second reflective layer 3 is parallel to the first light reflection axis of the first reflective layer 2, when the double-sided reflective display panel is displaying an image, light with a polarization direction parallel to the first light reflection axis can be reflected and utilized by the first reflective layer 2, and light with a polarization direction parallel to the second light reflection axis can be reflected and utilized by the second reflective layer 3 (whether it is a single-sided display or a double-sided display, the first reflective layer 2 and the second reflective layer 3 can be used to reflect light), thereby improving the utilization rate of ambient light and enhancing the display brightness and display effect.

[0053] Example 2

[0054] Continue to refer to Figure 1 The double-sided reflective display panel has multiple pixel units arranged in an array. The first color resist layer 16 includes multiple first color resist blocks, multiple second color resist blocks, and multiple first colorless resist areas arranged in an array. The multiple first color resist blocks, multiple second color resist blocks, and multiple first colorless resist areas are respectively located within the multiple pixel units. The first color resist blocks selectively transmit light of a first color, the second color resist blocks selectively transmit light of a second color, and the first colorless resist areas transmit light of various colors. The area of ​​the first cholesteric liquid crystal layer 15 corresponding to the first colorless resist area reflects light of a third color. The second control electrode 14 includes multiple first pixel electrodes arranged in an array. Located within multiple pixel units; and / or, the second color resist layer 26 includes multiple third color resist blocks, multiple fourth color resist blocks, and multiple second colorless resist areas arranged in an array. The multiple third color resist blocks, multiple fourth color resist blocks, and multiple second colorless resist areas are respectively located within multiple pixel units. The third color resist blocks selectively transmit light of a first color, the fourth color resist blocks selectively transmit light of a second color, the second colorless resist areas transmit light of various colors, and the area of ​​the second cholesteric liquid crystal layer 25 corresponding to the second colorless resist area reflects light of a third color. The fourth control electrode 24 includes multiple second pixel electrodes arranged in an array, located within multiple pixel units. The double-sided reflective display panel has multiple cholesteric liquid crystals within the arrayed pixel units that are individually controlled.

[0055] In an optional implementation, any one of the first color light, the second color light, and the third color light is red light, another of which is green light, and yet another of which is blue light.

[0056] In an optional embodiment, the first cholesteric liquid crystal layer 15 includes a first dye liquid crystal, the first dye liquid crystal exhibiting the same color as the first cholesteric liquid crystal under preset conditions; and / or, the second cholesteric liquid crystal layer 25 includes a second dye liquid crystal, the second dye liquid crystal exhibiting the same color as the second cholesteric liquid crystal under preset conditions. For example, the first cholesteric liquid crystal reflects red light in a planar textured state, at which time the first dye liquid crystal absorbs light other than red light; and / or, the second cholesteric liquid crystal reflects red light in a planar textured state, at which time the second dye liquid crystal absorbs light other than red light.

[0057] Specifically, in this embodiment, both the first and second cholesteric liquid crystals can reflect red light, while the first and second dye liquid crystals absorb light other than red. The first and third color blocks absorb colors other than green light, i.e., selectively transmit green light, and the second and fourth color blocks absorb colors other than blue light, i.e., selectively transmit blue light. In other embodiments, the first and second cholesteric liquid crystals can also display other colors of light, such as blue and green light, and the first, second, third, and fourth color blocks can also selectively transmit other colors of light, such as red light.

[0058] Specifically, the working principle of this double-sided reflective display panel is as follows: the first reflective layer 2 and the second reflective layer 3 are both APF (Advance Polarizer Film) films, and their working principle is as described above, and will not be repeated here.

[0059] Figure 1 A cross-sectional schematic diagram of a state of the double-sided reflective display panel of this embodiment is shown. Specifically, the first cholesteric liquid crystal layer 15 corresponding to the plurality of first color blocks and the plurality of second color blocks is in a transparent state, the first cholesteric liquid crystal layer 15 corresponding to the plurality of first colorless resistive regions is in a planar textured state, and at the same time, the second cholesteric liquid crystal layer 25 corresponding to the plurality of third color blocks and the plurality of fourth color blocks is in a transparent state, and the second cholesteric liquid crystal layer 25 corresponding to the plurality of second colorless resistive regions is in a planar textured state.

[0060] Figure 2 A cross-sectional schematic diagram showing another state of the double-sided reflective display panel of this embodiment is shown. Specifically, the first cholesteric liquid crystal layer 15 corresponding to the plurality of first color blocks and the plurality of second color blocks is in a focal conical state, the first cholesteric liquid crystal layer 15 corresponding to the plurality of first colorless resistive regions is in a planar textured state, and at the same time, the second cholesteric liquid crystal layer 25 corresponding to the plurality of third color blocks and the plurality of fourth color blocks is in a focal conical state, and the second cholesteric liquid crystal layer 25 corresponding to the plurality of second colorless resistive regions is in a planar textured state.

[0061] like Figure 1 and Figure 2 As shown, when the first dimming liquid crystal cell 1 is displaying an image (i.e., displaying an image on the upper side of the double-sided reflective display panel): the incident light (ambient light) corresponding to the multiple first color blocks passes through the first color block layer 16, and all colors except green light are absorbed. The green light passes through the first cholesteric liquid crystal layer 15 and the first transflective layer 2 in sequence. When passing through the first transflective layer 2, the light with a polarization direction of 90° is reflected by the first transflective layer 2, and the light with a polarization direction of 0° passes through the first transflective layer 2 and reaches the second transflective layer 3, where it is reflected. This allows both light with polarization directions of 0° and 90° to be reflected and utilized, thereby displaying green in the multiple first color block areas; the incident light (ambient light) corresponding to the multiple second color blocks passes through the first color block layer 16. Afterwards, all colors except blue light are absorbed. Blue light passes sequentially through the first cholesteric liquid crystal layer 15 and the first transflective layer 2. When passing through the first transflective layer 2, light with a polarization direction of 90° is reflected by the first transflective layer 2, while light with a polarization direction of 0° passes through the first transflective layer 2 and reaches the second transflective layer 3, where it is reflected. This allows light with polarization directions of 0° and 90° to be reflected and utilized, thus making the multiple second color blocking areas display blue. The incident light (ambient light) corresponding to the multiple first colorless blocking areas passes sequentially through the first color blocking layer 16 and the first cholesteric liquid crystal layer 15. The incident light is absorbed by the first dye liquid crystal, and the red light reflected by the first cholesteric liquid crystal is reflected out through the multiple first colorless blocking areas, making the multiple first colorless blocking areas display red. After three-color mixing, the first dimming liquid crystal cell 1 ultimately displays white.

[0062] Similarly, such as Figure 1 and Figure 2 As shown, when the second dimming liquid crystal cell 4 is displaying an image (i.e., displaying an image on the upper side of the double-sided reflective display panel), the second cholesteric liquid crystal layer 25 corresponding to the multiple third color blocks and multiple fourth color blocks in the second dimming liquid crystal cell 4 is in a transparent state (see reference). Figure 1 ) or focal conic state (reference) Figure 2When the incident light (ambient light) corresponding to the multiple third color blocks passes through the second color block 26, all colors except green light are absorbed. The green light passes sequentially through the second cholesteric liquid crystal layer 25 and the second reflective layer 3. When passing through the second reflective layer, light with a polarization direction of 0° is reflected by the second reflective layer 3, while light with a polarization direction of 90° passes through the second reflective layer 3 and reaches the first reflective layer 2, where it is reflected. This ensures that light with polarization directions of 0° and 90° can be reflected and utilized, thus displaying green in the multiple third color block areas. Similarly, when the incident light (ambient light) corresponding to the multiple fourth color blocks passes through the second color block 26, all colors except blue light are absorbed. After passing through the second cholesteric liquid crystal layer 25 and the second transflective layer 3, the light with a polarization direction of 0° is reflected by the second transflective layer 3, while the light with a polarization direction of 90° passes through the second transflective layer 3 and reaches the first transflective layer 2, where it is reflected. This ensures that both 0° and 90° polarized light can be reflected and utilized, thus causing the multiple fourth color blocking regions to display blue. The incident light (ambient light) corresponding to the multiple second colorless blocking regions passes through the second color blocking layer 26 and the second cholesteric liquid crystal layer 25, where it is absorbed by the second dye liquid crystal. The red light reflected by the second cholesteric liquid crystal is reflected by the multiple second colorless blocking regions, causing them to display red. After three-color mixing, the second dimming liquid crystal cell 4 ultimately displays white.

[0063] Example 3

[0064] The difference between this embodiment and Embodiment 2 is that the double-sided reflective display panel can achieve double-sided or single-sided black display.

[0065] In an optional implementation, a first black substrate is disposed on the first pixel electrode corresponding to the first colorless resistive region, the first black substrate being adjacent to the first opposing substrate 12; and / or, a second black substrate is disposed on the second pixel electrode corresponding to the second colorless resistive region, the second black substrate being adjacent to the second opposing substrate 22.

[0066] Figure 3 A cross-sectional schematic diagram of a state of the double-sided reflective display panel of this embodiment is shown. Specifically, the first cholesteric liquid crystal layer 15 corresponding to the plurality of first color blocks and the plurality of second color blocks has a planar textured state, the first cholesteric liquid crystal layer 15 corresponding to the plurality of first colorless resistive regions has a transparent state, and at the same time, the second cholesteric liquid crystal layer 25 corresponding to the plurality of third color blocks and the plurality of fourth color blocks has a planar textured state, and the first cholesteric liquid crystal layer 15 corresponding to the plurality of second colorless resistive regions has a transparent state.

[0067] Figure 4A cross-sectional schematic diagram showing another state of the double-sided reflective display panel of this embodiment is shown. Specifically, the first cholesteric liquid crystal layer 15 corresponding to the multiple first color resist blocks and the multiple second color resist blocks exhibits a planar textured state, and the first cholesteric liquid crystal layer 15 corresponding to the multiple first colorless resistive regions exhibits a focal conical state. Simultaneously, the second cholesteric liquid crystal layer 25 corresponding to the multiple third color resist blocks and the multiple fourth color resist blocks exhibits a planar textured state, and the first cholesteric liquid crystal layer 15 corresponding to the multiple second colorless resistive regions exhibits a focal conical state. This state is a steady state, requiring no prolonged power supply, and is a low-power energy-saving mode.

[0068] like Figure 3 and Figure 4 As shown, when the first dimming liquid crystal cell 1 is displaying an image (i.e., displaying an image on the upper side of the double-sided reflective display panel): the incident light (ambient light) corresponding to the multiple first color blocks and multiple second color blocks passes sequentially through the first color block layer 16 and the first cholesteric liquid crystal layer 15. The first dye within the first color block layer 16 and the first cholesteric liquid crystal layer 15 absorbs all the light, and the areas corresponding to the multiple first color blocks and multiple second color blocks do not reflect light. Similarly, the incident light (ambient light) corresponding to the multiple first colorless resist areas passes sequentially through the first color block layer 16, the first cholesteric liquid crystal layer 15, and the first pixel electrode, and is absorbed by the first black substrate. Therefore, the areas corresponding to the multiple first colorless resist areas also do not reflect light. Ultimately, the first dimming liquid crystal cell 1 displays black.

[0069] Similarly, such as Figure 3 and Figure 4 As shown, when the second dimming liquid crystal cell 4 is displaying an image (i.e., displaying an image on the upper side of the double-sided reflective display panel): the incident light (ambient light) corresponding to the multiple third color blocks and multiple fourth color blocks passes sequentially through the second color block layer 26 and the second cholesteric liquid crystal layer 25. The second dye within the second color block layer 26 and the second cholesteric liquid crystal layer 25 absorbs all the light, and the areas corresponding to the multiple third color blocks and multiple fourth color blocks do not reflect light. Similarly, the incident light (ambient light) corresponding to the multiple second colorless resist areas passes sequentially through the second color block layer 26, the second cholesteric liquid crystal layer 25, and the second pixel electrode, and is absorbed by the second black substrate. Therefore, the areas corresponding to the multiple second colorless resist areas also do not reflect light. Ultimately, the second dimming liquid crystal cell 4 displays black.

[0070] Example 4

[0071] The difference between this embodiment and Embodiment 1 is that, in this embodiment, the first color resist layer 16 is not provided in the first dimming liquid crystal cell 1, and the specific color is displayed only through the first cholesteric liquid crystal layer 15 in the first dimming liquid crystal cell 1; and / or, the second color resist layer 26 is not provided in the second dimming liquid crystal cell 4, and the specific color is displayed only through the second cholesteric liquid crystal layer 25 in the second dimming liquid crystal cell 4.

[0072] In an optional embodiment, when both the first cholesteric liquid crystal and the second cholesteric liquid crystal exhibit a planar textured state, the double-sided reflective display panel displays an image. The first dimming liquid crystal cell 1 displays a first preset color reflected by the first cholesteric liquid crystal, which can be red, green, blue, etc., and the second dimming liquid crystal cell 4 displays a second preset color reflected by the second cholesteric liquid crystal, which can be red, green, blue, etc. The first and second preset colors can be the same or different. Furthermore, when both the first and second cholesteric liquid crystals exhibit a focal conic or transmissive state, the double-sided reflective display panel exhibits a transparent or hazy state.

[0073] The detailed descriptions listed above are merely specific descriptions of feasible implementation methods of this application and are not intended to limit the scope of protection of this application. All equivalent implementation methods or modifications made without departing from the spirit of the art of this application should be included within the scope of protection of this application.

Claims

1. A double-sided reflective display panel, characterized in that, It includes a first dimming liquid crystal cell, a first transflective layer, a second transflective layer, and a second dimming liquid crystal cell arranged sequentially, wherein: The first dimming liquid crystal cell includes a first substrate, a first opposing substrate disposed opposite to the first substrate, and a first cholesteric liquid crystal layer disposed between the first substrate and the first opposing substrate. The first opposing substrate is adjacent to the first transflective layer. A first control electrode is disposed on the first substrate adjacent to the first cholesteric liquid crystal layer. A first color resist layer is disposed on the side of the first substrate close to the first control electrode. The first color resist layer is used to selectively transmit a first preset color. A second control electrode is disposed on the first opposing substrate adjacent to the first cholesteric liquid crystal layer. The first cholesteric liquid crystal layer includes first cholesteric liquid crystal and is used to transmit or reflect light. The second dimming liquid crystal cell includes a second substrate, a second opposing substrate disposed opposite to the second substrate, and a second cholesteric liquid crystal layer disposed between the second substrate and the second opposing substrate. The second opposing substrate is adjacent to the second transflective layer. A third control electrode is provided on the second substrate adjacent to the second cholesteric liquid crystal layer. A second color resist layer is provided on the side of the second substrate close to the third control electrode. The second color resist layer is used to selectively transmit a second preset color. A fourth control electrode is provided on the second opposing substrate adjacent to the second cholesteric liquid crystal layer. The second cholesteric liquid crystal layer includes a second cholesteric liquid crystal. The second dimming liquid crystal cell is used to transmit or reflect light. The first transflective layer has a first light transmission axis and a first light reflection axis. The first transflective layer can transmit light rays parallel to the first light transmission axis and reflect light rays parallel to the first light reflection axis. The second transflective layer has a second light transmission axis and a second light reflection axis. The second transflective layer can transmit light rays parallel to the second light transmission axis and reflect light rays parallel to the second light reflection axis. The first light transmission axis and the second light reflection axis are parallel to each other, and the second light transmission axis and the first light reflection axis are parallel to each other. The double-sided reflective display panel has multiple pixel units arranged in an array. The first color resist layer includes a plurality of first color resist blocks, a plurality of second color resist blocks, and a plurality of first colorless resist regions arranged in an array. The plurality of first color resist blocks, the plurality of second color resist blocks, and the plurality of first colorless resist regions are respectively located in a plurality of pixel units. The first color resist blocks selectively transmit light of a first color, the second color resist blocks selectively transmit light of a second color, the first colorless resist regions transmit light of various colors, and the area of ​​the first cholesteric liquid crystal layer corresponding to the first colorless resist region reflects light of a third color. The second control electrode includes a plurality of first pixel electrodes arranged in an array. The plurality of first pixel electrodes are located in a plurality of pixel units. And / or, the second color resist layer includes a plurality of third color resist blocks, a plurality of fourth color resist blocks, and a plurality of second colorless resist regions arranged in an array. The plurality of third color resist blocks, the plurality of fourth color resist blocks, and the plurality of second colorless resist regions are respectively located within a plurality of the pixel units. The third color resist blocks selectively transmit light of a first color, the fourth color resist blocks selectively transmit light of a second color, the second colorless resist regions transmit light of various colors, and the region of the second cholesteric liquid crystal layer corresponding to the second colorless resist region reflects light of a third color. The fourth control electrode includes a plurality of second pixel electrodes arranged in an array. The plurality of second pixel electrodes are located within a plurality of the pixel units.

2. The double-sided reflective display panel according to claim 1, characterized in that, The first cholesteric liquid crystal has a transparent state, a focal conic state, and a planar textured state; When the first cholesteric liquid crystal is in a planar textured state, the first cholesteric liquid crystal can reflect light of a specific color; When the first cholesteric liquid crystal is in a transparent state, the first cholesteric liquid crystal has the function of transmitting light; When the first cholesteric liquid crystal is in a focal conic state, the first cholesteric liquid crystal can scatter light and increase the emission angle of the light. And / or, the second cholesteric liquid crystal has a transparent state, a focal conic state, and a planar textured state; When the second cholesteric liquid crystal is in a planar textured state, the second cholesteric liquid crystal can reflect light of a specific color; When the second cholesteric liquid crystal is in a transparent state, the second cholesteric liquid crystal has the function of transmitting light; When the second cholesteric liquid crystal is in a focal conic state, it can scatter light and increase the emission angle of the light.

3. The double-sided reflective display panel according to claim 1, characterized in that, The light of the first color, the light of the second color, and the light of the third color are all red light, the other is green light, and yet another is blue light.

4. The double-sided reflective display panel according to claim 3, characterized in that, When the cholesteric liquid crystals corresponding to the plurality of first color blocks and the plurality of second color blocks are in a transparent state or a focal cone state, the cholesteric liquid crystals corresponding to the plurality of first colorless regions are in a planar textured state. And / or, when the cholesteric liquid crystals corresponding to the plurality of third color blocks and the plurality of fourth color blocks are in a transparent state or a focal cone state, the cholesteric liquid crystals corresponding to the plurality of second colorless blocking regions are in a planar textured state.

5. The double-sided reflective display panel according to claim 3, characterized in that, The first cholesteric liquid crystal layer includes a first dye liquid crystal, and the first dye liquid crystal and the first cholesteric liquid crystal present the same color under preset conditions; And / or, the second cholesteric liquid crystal layer includes a second dye liquid crystal, the second dye liquid crystal and the second cholesteric liquid crystal exhibiting the same color under preset conditions.

6. The double-sided reflective display panel according to claim 5, characterized in that, A first black substrate is disposed on the first pixel electrode corresponding to the first colorless resistive region, and the first black substrate is adjacent to the first opposing substrate. And / or, a second black substrate is disposed on the second pixel electrode corresponding to the second colorless resistive region, the second black substrate being adjacent to the second opposing substrate.

7. The double-sided reflective display panel according to claim 6, characterized in that, When the cholesteric liquid crystals corresponding to the plurality of first color blocks and the plurality of second color blocks exhibit a planar textured state, the cholesteric liquid crystals corresponding to the plurality of first colorless regions exhibit a transparent state or a focal cone state. And / or, when the cholesteric liquid crystals corresponding to the plurality of third color blocks and the plurality of fourth color blocks exhibit a planar textured state, the cholesteric liquid crystals corresponding to the plurality of second colorless blocking regions exhibit a transparent state or a focal cone state.

8. The double-sided reflective display panel according to claim 1, characterized in that, Both the first and second transflective layers are APF films or metal wire grid polarizers.

9. The double-sided reflective display panel according to claim 1, characterized in that, The first substrate, the first opposing substrate, the second substrate, and the second opposing substrate are all made of transparent glass or transparent plastic, and the first control electrode, the second control electrode, the third control electrode, and the fourth control electrode are all made of transparent conductive material.

Images