Dual-sided reflective display panel

Abstract

This invention relates to the field of display technology, and its embodiments disclose a double-sided reflective display panel, comprising a first liquid crystal cell, a first transflective layer, a dimming liquid crystal cell, a second transflective layer, and a second liquid crystal cell arranged sequentially. The first liquid crystal cell includes a first array substrate, a first opposing substrate, and a first liquid crystal layer; the second liquid crystal cell includes a second array substrate, a second opposing substrate, and a second liquid crystal layer. The first transflective layer has a first light transmission axis and a first light reflection axis, and the second transflective layer has a second light transmission axis and a 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 dimming liquid crystal cell includes a cholesteric liquid crystal layer, and the dimming liquid crystal cell is used to increase the emission angle of light or reflect light of a specific color. This double-sided reflective display panel can improve the utilization rate of ambient light, thereby improving display brightness and display effect.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a double-sided reflective display panel. Background Technology

[0002] Liquid crystal displays (LCDs) have become mainstream products in the market due to their superior performance and mature technology. LCDs can be classified according to the type of light source, including transmissive, reflective, and transflective-transparent (also known as semi-transmissive / semi-reflective). Existing reflective and transflective LCDs can be used outdoors to fully utilize ambient light, reflecting external light to obtain all (reflective) or part (transflective) of the light source needed to display the image.

[0003] Currently, most reflective display panels on the market are single-sided displays. However, in many situations, such as advertising equipment in public places like digital signage, electronic communication equipment, cash registers, information desks, and exhibition halls, it is often necessary to achieve double-sided display of reflective display panels, that is, the displayed image can be viewed simultaneously from both the front and back of the reflective display panel.

[0004] Existing double-sided reflective display panels typically incorporate a metal reflective layer within the panel to reflect ambient light, thus using ambient light as a light source. However, the low reflectivity of the metal reflective layer results in low utilization of ambient light by the double-sided reflective display panel, consequently affecting display brightness and display quality. Summary of the Invention

[0005] The purpose of this invention is to provide a double-sided reflective display panel that can improve the utilization of ambient light, thereby enhancing display brightness and display effect.

[0006] This invention provides a double-sided reflective display panel, comprising a first liquid crystal cell, a first transflective layer, a dimming liquid crystal cell, a second transflective layer, and a second liquid crystal cell arranged sequentially. The first liquid crystal cell includes a first array substrate, a first opposing substrate disposed opposite to the first array substrate, and a first liquid crystal layer disposed between the first array substrate and the first opposing substrate, wherein the first opposing substrate is located on the side of the first liquid crystal layer away from the first transflective layer. The second liquid crystal cell includes a second array substrate, a second opposing substrate disposed opposite to the second array substrate, and a second liquid crystal layer disposed between the second array substrate and the second opposing substrate, wherein the second opposing substrate is located on the side of the second liquid crystal layer away from the second transflective layer.

[0007] 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.

[0008] The dimming liquid crystal cell includes a cholesteric liquid crystal layer, which contains cholesteric liquid crystal. The dimming liquid crystal cell is used to increase the emission angle of light or reflect light of a specific color.

[0009] In one achievable manner, the cholesteric liquid crystal has a hazy state and a transparent state; when the cholesteric liquid crystal is in a hazy state, it can scatter light to increase the light emission angle; when the cholesteric liquid crystal is in a transparent state, it has the function of transmitting light.

[0010] In one feasible manner, the cholesteric liquid crystal has a planar texture and is capable of reflecting light of a specific color.

[0011] In one possible implementation, a first spacer layer and a plurality of first pixel electrodes arranged in an array are provided on the side of the first array substrate near the first opposing substrate. The first pixel electrodes are stacked adjacent to the first spacer layer, and the first pixel electrodes are located on the side of the first spacer layer near the first opposing substrate. The surface of the first spacer layer near the first pixel electrode has an uneven structure, and the first pixel electrode has an uneven structure.

[0012] And / or, the second array substrate has a second spacer layer and a plurality of second pixel electrodes arranged in an array on the side near the second opposing substrate, the second pixel electrodes are stacked adjacent to the second spacer layer, and the second pixel electrodes are located on the side of the second spacer layer near the second opposing substrate; the surface of the second spacer layer near the second pixel electrode has an uneven structure, and the second pixel electrode has an uneven structure.

[0013] In one possible implementation, a third spacer layer and a first common electrode are provided on the side of the first opposing substrate near the first array substrate. The first common electrode and the third spacer layer are stacked adjacent to each other, and the first common electrode is located on the side of the third spacer layer near the first array substrate. The surface of the third spacer layer near the first common electrode has an uneven structure, and the first common electrode also has an uneven structure.

[0014] And / or, a fourth spacer layer and a second common electrode are provided on the side of the second opposing substrate near the second array substrate, the second common electrode and the fourth spacer layer are stacked adjacent to each other, and the second common electrode is located on the side of the fourth spacer layer near the second array substrate; the surface of the fourth spacer layer near the second common electrode has an uneven structure, and the second common electrode has an uneven structure.

[0015] In one possible implementation, a first color resist layer is provided on the side of the first opposing substrate near the first array substrate. 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 white color resist blocks arranged in an array. The first color resist blocks can selectively transmit light of a first color, the second color resist blocks can selectively transmit light of a second color, and the cholesteric liquid crystal can reflect light of a third color. A plurality of first pixel electrodes are provided on the side of the first array substrate near the first opposing substrate. The first pixel electrodes corresponding to the first color resist blocks and the second color resist blocks are metal reflective electrodes, and the first pixel electrodes corresponding to the first white color resist blocks are transparent electrodes.

[0016] And / or, a second color resist layer is provided on the side of the second opposing substrate near the second array substrate. 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 white color resist blocks arranged in an array. The third color resist blocks can selectively transmit light of a first color, the fourth color resist blocks can selectively transmit light of a second color, and the cholesteric liquid crystal can reflect light of a third color. A plurality of second pixel electrodes are provided on the side of the second array substrate near the second opposing substrate. The second pixel electrodes corresponding to the third color resist blocks and the fourth color resist blocks are metal reflective electrodes, and the second pixel electrodes corresponding to the second white color resist blocks are transparent electrodes.

[0017] In one feasible manner, 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.

[0018] In one possible embodiment, the dimming liquid crystal cell further includes a first substrate and a second substrate disposed opposite to each other, with the cholesteric liquid crystal layer located between the first substrate and the second substrate; a first control electrode is provided on the side of the first substrate near the second substrate, and a second control electrode cooperating with the first control electrode is provided on the side of the second substrate near the first substrate.

[0019] In one possible implementation, both the first and second transflective layers are APF films or metal wire grid polarizers.

[0020] In one possible implementation, the first liquid crystal cell has a first circular polarizer on the side away from the first reflective layer, and the second liquid crystal cell has a second circular polarizer on the side away from the second reflective layer.

[0021] The present invention also provides a display device, including the above-described double-sided reflective display panel.

[0022] The double-sided reflective display panel provided by this invention, by setting a first reflective layer and a second reflective layer between a first liquid crystal cell and a second liquid crystal cell, and by having the first light transmission axis of the first reflective layer parallel to the second light reflection axis of the second reflective layer, and vice versa, improves the utilization of ambient light and enhances display brightness and effect when the double-sided reflective display panel is displaying an image. This is achieved by setting a dimming liquid crystal cell between the first and second reflective layers, which includes a cholesteric liquid crystal layer. The dimming liquid crystal cell can increase the light emission angle or reflect specific colors of light, thereby achieving diffuse reflection display effects or single-color / full-color display, diversifying functions, meeting different product needs, and enhancing product competitiveness. Attached Figure Description

[0023] Figure 1 This is a cross-sectional schematic diagram of the double-sided reflective display panel in the first embodiment of the present invention when the cholesteric liquid crystal is in a foggy state.

[0024] Figure 2 This is a cross-sectional schematic diagram of the double-sided reflective display panel in the first embodiment of the present invention when the cholesteric liquid crystal is in a transparent state.

[0025] Figure 3 This is a cross-sectional schematic diagram of the double-sided reflective display panel in the second embodiment of the present invention.

[0026] Figure 4 This is a cross-sectional schematic diagram of the double-sided reflective display panel in the third embodiment of the present invention.

[0027] Figure 5 This is a cross-sectional schematic diagram of the double-sided reflective display panel in the fourth embodiment of the present invention. Detailed Implementation

[0028] 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.

[0029] 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.

[0030] 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.

[0031] First Embodiment

[0032] Figure 1 This is a cross-sectional schematic diagram of the double-sided reflective display panel in the first embodiment of the present invention when the cholesteric liquid crystal is in a foggy state. Figure 2 This is a cross-sectional schematic diagram of the double-sided reflective display panel in the first embodiment of the present invention when the cholesteric liquid crystal is in a transparent state. Figure 1 and Figure 2 As shown, the first embodiment of the present invention provides a double-sided reflective display panel that uses ambient light as its light source, thus eliminating the need for a backlight. This double-sided reflective display panel has multiple pixel units arranged in an array, including a first liquid crystal cell 1, a first transflective layer 2, a dimming liquid crystal cell 3, a second transflective layer 4, and a second liquid crystal cell 5 arranged sequentially. The first liquid crystal cell 1 includes a first array substrate 11, a first opposing substrate 12 disposed opposite to the first array substrate 11, and a first liquid crystal layer 13 disposed between the first array substrate 11 and the first opposing substrate 12. The first opposing substrate 12 is located on the side of the first liquid crystal layer 13 away from the first transflective layer 2 (i.e., the first opposing substrate 12 is located on the light-emitting side of the first liquid crystal layer 13). The second liquid crystal cell 5 includes a second array substrate 51, a second opposing substrate 52 disposed opposite to the second array substrate 51, and a second liquid crystal layer 53 disposed between the second array substrate 51 and the second opposing substrate 52. The second opposing substrate 52 is located on the side of the second liquid crystal layer 53 away from the second transflective layer 4 (i.e., the second opposing substrate 52 is located on the light-emitting side of the second liquid crystal layer 53).

[0033] Both the first transflective layer 2 and the second transflective layer 4 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 that are perpendicular to each other. It transmits light parallel to the first transmission axis (i.e., light with a polarization direction parallel to the first transmission axis) and reflects light parallel to the first reflection axis (i.e., light with a polarization direction parallel to the first reflection axis). The second transflective layer 4 has a second transmission axis and a second reflection axis that are perpendicular to each other. It transmits light parallel to the second transmission axis (i.e., light with a polarization direction parallel to the second transmission axis) and reflects light parallel to the second reflection axis (i.e., light with a polarization direction parallel to the second reflection axis). Specifically, 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.

[0034] The dimming liquid crystal cell 3 includes a cholesteric liquid crystal layer 33, which includes a cholesteric liquid crystal 331. The dimming liquid crystal cell 3 has a dimming function and is used to increase the emission angle of light, that is, the dimming liquid crystal cell 3 is used to form a diffuse reflection structure.

[0035] Specifically, the working principle of this double-sided reflective display panel is as follows: Figure 1As shown, in this embodiment, both the first transflective layer 2 and the second transflective layer 4 are APF (Advanced Polarizer Film) films, i.e., reflective polarizing ultrathin optical films. The first transmission axis of the first transflective layer 2 is 0° and the first reflection axis is 90°. The second transmission axis of the second transflective layer 4 is 90° and the second reflection axis is 0° (of course, in other embodiments, the first transmission axis, the first reflection axis, the second transmission axis, and the second reflection axis can also be other angles, as long as 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). When the first 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) passes through the first reflective layer 2. Light with a polarization direction of 90° is reflected by the first reflective layer 2, while light with a polarization direction of 0° passes through the first reflective layer 2 and reaches the second reflective layer 4, where it is reflected. This allows both 0° and 90° polarized light to be reflected and utilized, thereby improving the utilization rate of ambient light and enhancing display brightness and effect. Similarly, when the second liquid crystal cell 5 is displaying an image (i.e., displaying an image on the lower side of the double-sided reflective display panel), the incident light (ambient light) passes through the second reflective layer 4. Light with a polarization direction of 0° is reflected by the second reflective layer 4, while light with a polarization direction of 90° passes through the second reflective layer 4 and reaches the first reflective layer 2, where it is reflected. This allows both 0° and 90° polarized light to be reflected and utilized, thereby improving the utilization rate of ambient light and enhancing display brightness and effect. Of course, in other embodiments, the first reflective layer 2 and the second reflective layer 4 can also be metal wire grid polarizers.

[0036] like Figure 1 and Figure 2 As shown, in one embodiment, the cholesteric liquid crystal 331 has a hazy state and a transparent state and can switch between the two states. Figure 1As shown, when the cholesteric liquid crystal 331 is in a hazy state (i.e., FC focal conic state), it can scatter light (scatter the light) to increase the light emission angle, thereby increasing the viewing angle range. (It should be noted that for the first liquid crystal cell 1, only the light reflected by the second transflective layer 4 can be scattered by the cholesteric liquid crystal layer 33, while the light reflected by the first transflective layer 2 cannot be scattered by the cholesteric liquid crystal layer 33; for the second liquid crystal cell 5, only the light reflected by the first transflective layer 2 can be scattered by the cholesteric liquid crystal layer 33, while the light reflected by the second transflective layer 4 cannot be scattered by the cholesteric liquid crystal layer 33). In addition, a diffuse reflection layer (OC) can also be provided in the first liquid crystal cell 1 and the second liquid crystal cell 5. For example, a diffuse reflection layer is provided on the first array substrate 11 near the first opposing substrate 12 (or on the first opposing substrate 12 near the first array substrate 11) and on the second array substrate 51 near the second opposing substrate 52 (or on the second opposing substrate 52 near the second array substrate 51), thereby improving the viewing angle of the reflective display while further reducing the impact of specular reflection on the display; such as Figure 2 As shown, when the cholesteric liquid crystal 331 is in a transparent state (i.e., H-field nematic phase state), it has the function of transmitting light (at this time, it cannot scatter light), meaning that light can directly pass through the cholesteric liquid crystal layer 33. When different electric fields are applied to the cholesteric liquid crystal 331, the cholesteric liquid crystal 331 can switch between a hazy state and a transparent state. That is, in this embodiment, the dimming liquid crystal cell 3 is used to increase the emission angle of light, and does not have the function of reflecting specific color light.

[0037] Specifically, in this embodiment, such as Figure 1 As shown, when the cholesteric liquid crystal 331 is in a foggy state, the bi-reflective display panel displays the image (i.e., at this time, the first liquid crystal layer 13 and the second liquid crystal layer 53 form tone differences in each pixel unit by applying grayscale voltage). For example... Figure 2 As shown, when the cholesteric liquid crystal 331 is transparent, the entire first liquid crystal layer 13 is in a transmissive state (i.e., the first liquid crystal layer 13 has the highest transmittance of light, the grayscale brightness is the highest, and the brightness is the same at all positions of the first liquid crystal cell 1), so that the side of the double-sided reflective display panel close to the first liquid crystal cell 1 is in a specular reflective state (i.e., similar to a mirror, only reflecting light and not displaying an image); the second liquid crystal layer 53 is in a transmissive state, so that the side of the double-sided reflective display panel close to the second liquid crystal cell 5 is in a specular reflective state.

[0038] like Figure 1As shown, in one embodiment, the dimming liquid crystal cell 3 further includes a first substrate 31 and a second substrate 32 disposed opposite to each other, with a cholesteric liquid crystal layer 33 located between the first substrate 31 and the second substrate 32; a first control electrode 34 is provided on the first substrate 31 near the second substrate 32, and a second control electrode 35 cooperating with the first control electrode 34 is provided on the second substrate 32 near the first substrate 31. By adjusting the voltage applied between the first control electrode 34 and the second control electrode 35, the cholesteric liquid crystal 331 is controlled to switch between a hazy state and a transparent state.

[0039] like Figure 1 As shown, in one embodiment, no color resist layer is provided in either the first liquid crystal cell 1 or the second liquid crystal cell 5. Therefore, the double-sided reflective display panel can only display black and white images on both sides. Of course, in other embodiments, color resist layers can also be provided in the first liquid crystal cell 1 and the second liquid crystal cell 5 (for example, RGB color resist layers can be provided on the side of the first opposing substrate 12 near the first array substrate 11 and on the side of the second opposing substrate 52 near the second array substrate 51) so that the double-sided reflective display panel can display colors on both sides.

[0040] like Figure 1 As shown, in one embodiment, a plurality of first pixel electrodes 14 and a plurality of first thin-film transistors (TFTs, not shown) are arranged in an array on the side of the first array substrate 11 near the first opposing substrate 12. The first pixel electrodes 14 have a block structure, and the plurality of first pixel electrodes 14 and the plurality of first thin-film transistors are respectively located in a plurality of pixel units. The first pixel electrodes 14 are electrically connected to the corresponding first thin-film transistors. A first common electrode 15 cooperating with the first pixel electrodes 14 is provided on the side of the first opposing substrate 12 near the first array substrate 11. The first common electrode 15 has a planar structure covering the first opposing substrate 12. Both the first pixel electrodes 14 and the first common electrode 15 are planar structures.

[0041] On the side of the second array substrate 51 near the second opposing substrate 52, there are multiple second pixel electrodes 54 and multiple second thin-film transistors (not shown) arranged in an array. The second pixel electrodes 54 have a block structure, and the multiple second pixel electrodes 54 and multiple second thin-film transistors are respectively located in multiple pixel units. The second pixel electrodes 54 are electrically connected to the corresponding second thin-film transistors. On the side of the second opposing substrate 52 near the second array substrate 51, there is a second common electrode 55 that cooperates with the second pixel electrodes 54. The second common electrode 55 has a planar structure covering the second opposing substrate 52. Both the second pixel electrodes 54 and the second common electrode 55 are planar structures.

[0042] like Figure 1As shown, in one embodiment, a first circular polarizer 61 is provided on the side of the first liquid crystal cell 1 away from the first reflective layer 2, and the first circular polarizer 61 can convert ambient light into circularly polarized light. A second circular polarizer 62 is provided on the side of the second liquid crystal cell 5 away from the second reflective layer 4, and the second circular polarizer 62 can convert ambient light into circularly polarized light. Both the first circular polarizer 61 and the second circular polarizer 62 respectively include a linear polarizer and a quarter-wave plate combined with each other.

[0043] In one embodiment, a first black matrix (not shown) is provided on the side of the first opposing substrate 12 near the first array substrate 11, and a second black matrix (not shown) is provided on the side of the second opposing substrate 52 near the second array substrate 51.

[0044] In one implementation, the first array substrate 11, the first opposing substrate 12, the second array substrate 51, the second opposing substrate 52, the first substrate 31, and the second substrate 32 can be made of transparent glass, transparent plastic, or other materials. The first pixel electrode 14, the first common electrode 15, the second pixel electrode 54, the second common electrode 55, the first control electrode 34, and the second control electrode 35 can be made of transparent conductive materials, such as indium tin oxide (ITO), indium zinc oxide (IZO), or aluminum zinc oxide.

[0045] This invention also provides a display device, including the above-described double-sided reflective display panel.

[0046] 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 4 between a first liquid crystal cell 1 and a second liquid crystal cell 5, 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 4, and the second light transmission axis of the second reflective layer 4 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 4 (whether it is a single-sided display or a double-sided display, the first reflective layer 2 and the second reflective layer 4 can be used to reflect light), thereby improving the utilization rate of ambient light and enhancing the display brightness and display effect. Meanwhile, by setting a dimming liquid crystal cell 3 between the first transflective layer 2 and the second transflective layer 4 (both the first liquid crystal cell 1 and the second liquid crystal cell 5 can be dimmed using the dimming liquid crystal cell 3 when displaying images), the dimming liquid crystal cell 3 includes a cholesteric liquid crystal layer 33. The dimming liquid crystal cell 3 can increase the light emission angle, thereby achieving a diffuse reflection display effect, realizing functional diversification, meeting different product needs, and enhancing product competitiveness.

[0047] Second Embodiment

[0048] Figure 3 This is a cross-sectional schematic diagram of the double-sided reflective display panel in the second embodiment of the present invention. Figure 3 As shown, the double-sided reflective display panel provided in the second embodiment of the present invention is basically the same as that in the first embodiment, except that the state and function of the cholesteric liquid crystal 331 are different, and the display functions that the double-sided reflective display panel can achieve are different; at the same time, the way and position of the diffuse reflection structure are formed are different.

[0049] Specifically, in this embodiment, the cholesteric liquid crystal 331 is in a planar textured state (i.e., P state). The cholesteric liquid crystal 331 can reflect light of a specific color, that is, the dimming liquid crystal cell 3 plays the role of reflecting light of a specific color. At this time, the double-sided reflective display panel can realize a single color color display.

[0050] Specifically, the wavelength (i.e., the color of the reflected light) of the selectively reflected light by the cholesteric liquid crystal 331 is related to the pitch of the cholesteric liquid crystal 331. By changing the pitch of the cholesteric liquid crystal 331 (i.e., injecting cholesteric liquid crystal 331 with different pitches into the liquid crystal cell), the wavelength of the reflected light can be controlled. In this embodiment, the cholesteric liquid crystal 331 can reflect blue light (liquid crystal pitch range of 190 nm to 340 nm), and the double-sided reflective display panel can achieve a single blue color display. In other embodiments, the cholesteric liquid crystal 331 can also reflect other colors of light, such as orange light (liquid crystal pitch range of 230 nm to 580 nm).

[0051] like Figure 3 As shown, when the first liquid crystal cell 1 is displaying an image (i.e., displaying an image on the upper side of the double-sided reflective display panel), when the incident light (ambient light) passes through the first reflective layer 2, a portion of the light is reflected by the first reflective layer 2. The blue light in the light passing through the first reflective layer 2 is reflected by the cholesteric liquid crystal layer 33 (i.e., forming blue reflected light), while other colors of light passing through the first reflective layer 2 are reflected by the second reflective layer 4, thus achieving a single blue color display. (It should be noted that since the reflectivity of the cholesteric liquid crystal layer 33 is greater than that of the second reflective layer 4, the blue light reflected by the cholesteric liquid crystal layer 33 and the mixed-color light reflected by the second reflective layer 4 still result in blue light.) The principle of the second liquid crystal cell 5 performing a single blue color display is similar to the above and will not be repeated here.

[0052] like Figure 3 As shown, in one embodiment, no color resist layer is provided in either the first liquid crystal cell 1 or the second liquid crystal cell 5.

[0053] like Figure 3As shown, in one embodiment, a first spacer layer 16 and a plurality of first pixel electrodes 14 arranged in an array are provided on the side of the first array substrate 11 near the first opposing substrate 12. Each first pixel electrode 14 is made of a transparent conductive material. The first pixel electrodes 14 and the first spacer layer 16 are stacked adjacent to each other, and the first pixel electrodes 14 are located on the side of the first spacer layer 16 near the first opposing substrate 12. The surface of the first spacer layer 16 near the first pixel electrode 14 has an uneven structure, and the first pixel electrode 14 has an uneven structure, thereby forming a diffuse reflection structure (i.e., the first pixel electrode 14 and the first spacer layer 16 cooperate to form a microlens structure) to scatter light. The first spacer layer 16 is a planar structure covering the first array substrate 11 (of course, the first spacer layer 16 can also be a block structure corresponding one-to-one with the first pixel electrode 14), and the first spacer layer 16 can be made of OC material (organic resin material). The first common electrode 15 has a flat structure.

[0054] A second spacer layer 56 and a plurality of second pixel electrodes 54 arranged in an array are provided on the side of the second array substrate 51 near the second opposing substrate 52. Each second pixel electrode 54 is made of a transparent conductive material. The second pixel electrodes 54 and the second spacer layer 56 are stacked adjacent to each other, with the second pixel electrodes 54 located on the side of the second spacer layer 56 near the second opposing substrate 52. The surface of the second spacer layer 56 near the second pixel electrodes 54 has an uneven structure, which, together with the uneven structure of the second pixel electrodes 54, forms a diffuse reflection structure (i.e., the second pixel electrodes 54 and the second spacer layer 56 cooperate to form a microlens structure) to scatter light. The second spacer layer 56 is a planar structure covering the second array substrate 51 (of course, the second spacer layer 56 can also be a block structure corresponding one-to-one with the second pixel electrodes 54), and the second spacer layer 56 can be made of OC material (organic resin material). The second common electrode 55 has a flat structure.

[0055] Other structures in this embodiment are the same as or similar to those in the first embodiment, and will not be described in detail here.

[0056] Third Embodiment

[0057] Figure 4 This is a cross-sectional schematic diagram of the double-sided reflective display panel in the third embodiment of the present invention. Figure 4 As shown, the double-sided reflective display panel provided in the third embodiment of the present invention is basically the same as that in the second embodiment, except that the diffuse reflection structure is formed at a different location.

[0058] Specifically, in this embodiment, a third spacer layer 17 and a first common electrode 15 are provided on the side of the first opposing substrate 12 near the first array substrate 11. The first common electrode 15 and the third spacer layer 17 are stacked adjacent to each other, and the first common electrode 15 is located on the side of the third spacer layer 17 near the first array substrate 11. The surface of the third spacer layer 17 near the first common electrode 15 has an uneven structure, and the first common electrode 15 also has an uneven structure, thereby forming a diffuse reflection structure (i.e., the first common electrode 15 and the third spacer layer 17 cooperate to form a microlens structure) to scatter light. The third spacer layer 17 is a planar structure covering the first opposing substrate 12, and the third spacer layer 17 can be made of OC material (organic resin material). The first pixel electrode 14 has a flat structure.

[0059] A fourth spacer layer 57 and a second common electrode 55 are provided on the side of the second opposing substrate 52 near the second array substrate 51. The second common electrode 55 and the fourth spacer layer 57 are stacked adjacent to each other, with the second common electrode 55 located on the side of the fourth spacer layer 57 closest to the second array substrate 51. The surface of the fourth spacer layer 57 near the second common electrode 55 has an uneven structure, and the second common electrode 55 also has an uneven structure, thereby forming a diffuse reflection structure (i.e., the second common electrode 55 and the fourth spacer layer 57 cooperate to form a microlens structure) to scatter light. The fourth spacer layer 57 is a planar structure covering the second opposing substrate 52, and the fourth spacer layer 57 can be made of OC material (organic resin material). The second pixel electrode 54 has a flat structure.

[0060] Other structures in this embodiment are the same as or similar to those in the second embodiment, and will not be described in detail here.

[0061] Fourth embodiment

[0062] Figure 5 This is a cross-sectional schematic diagram of the double-sided reflective display panel in the fourth embodiment of the present invention. Figure 5 As shown, the double-sided reflective display panel provided in the fourth embodiment of the present invention is basically the same as that in the second embodiment, except that the display functions that the double-sided reflective display panel can achieve are different.

[0063] Specifically, in this embodiment, the cholesteric liquid crystal 331 also exhibits a planar textured state (i.e., P-state). The cholesteric liquid crystal 331 can reflect light of a specific color, that is, the dimming liquid crystal cell 3 plays the role of reflecting light of a specific color.

[0064] A first color resist layer 18 is provided on the side of the first opposing substrate 12 near the first array substrate 11. The first color resist layer 18 includes a plurality of first color resist blocks 181, a plurality of second color resist blocks 182, and a plurality of first white color resist blocks 183 (i.e., W color resist blocks) arranged in an array. The plurality of first color resist blocks 181, the plurality of second color resist blocks 182, and the plurality of first white color resist blocks 183 are respectively located in a plurality of pixel units. The first color resist blocks 181 and the second color resist blocks 182 play a role in filtering light. The first color resist block 181 can selectively transmit light of a first color, the second color resist block 182 can selectively transmit light of a second color, the cholesteric liquid crystal 331 can reflect light of a third color, and the first white color resist block 183 can transmit light of all colors. The first array substrate 11 has a plurality of first pixel electrodes 14 arranged in an array on one side near the first opposing substrate 12. The first pixel electrodes 14 corresponding to the first color resist block 181 and the second color resist block 182 are metal reflective electrodes (i.e., they are made of reflective metal material and have the function of reflecting light), and the first pixel electrodes 14 corresponding to the first white color resist block 183 are transparent electrodes (i.e., they are made of transparent conductive material and can transmit light).

[0065] A second color resist layer 58 is provided on the side of the second opposing substrate 52 near the second array substrate 51. The second color resist layer 58 includes a plurality of third color resist blocks 581, a plurality of fourth color resist blocks 582, and a plurality of second white color resist blocks 583 (i.e., W color resist blocks) arranged in an array. The plurality of third color resist blocks 581, the plurality of fourth color resist blocks 582, and the plurality of second white color resist blocks 583 are respectively located in a plurality of pixel units. The third color resist blocks 581 and the fourth color resist blocks 582 play a role in filtering light. The third color resist block 581 can selectively transmit light of the first color, the fourth color resist block 582 can selectively transmit light of the second color, the cholesteric liquid crystal 331 can reflect light of the third color, and the second white color resist block 583 can transmit light of all colors. The second array substrate 51 has a plurality of second pixel electrodes 54 arranged in an array on one side near the second opposing substrate 52. The second pixel electrodes 54 corresponding to the third color block 581 and the fourth color block 582 are metal reflective electrodes (i.e., they are made of reflective metal material and have the function of reflecting light), and the second pixel electrodes 54 corresponding to the second white color block 583 are transparent electrodes (i.e., they are made of transparent conductive material and can transmit light).

[0066] Among them, 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, thus realizing the full-color display of the double-sided reflective display panel.

[0067] Specifically, in this embodiment, the first color light is red light, the second color light is green light, and the third color light is blue light. That is, the first color block 181 and the third color block 581 are red color blocks (i.e., R color blocks), the second color block 182 and the fourth color block 582 are green color blocks (i.e., G color blocks), and the cholesteric liquid crystal 331 can reflect blue light.

[0068] like Figure 5 As shown, when the first liquid crystal cell 1 is displaying an image (i.e., displaying an image on the upper side of the double-sided reflective display panel), when the incident light (ambient light) passes through the first color block 181, red light is selectively transmitted and reflected by the corresponding first pixel electrode 14, causing the pixel unit corresponding to the first color block 181 to display red; when the incident light (ambient light) passes through the second color block 182, green light is selectively transmitted and reflected by the corresponding first pixel electrode 14, causing the pixel unit corresponding to the second color block 182 to display green; after the incident light (ambient light) passes through the first white color block 183 and the transparent first pixel electrode 14 in sequence, a portion of the light is reflected by the first reflective layer 2, and the blue light in the light after passing through the first reflective layer 2 is reflected by the cholesteric liquid crystal layer 33 (i.e., forming blue reflected light), and the other colors of light in the light after passing through the first reflective layer 2 are reflected by the second reflective layer 4, causing the pixel unit corresponding to the first white color block 183 to display blue, thereby achieving full-color display. The principle of full-color display in the second LCD cell 5 is similar to that described above, and will not be repeated here.

[0069] In one implementation, the first pixel electrode 14 corresponding to the first color resist block 181 and the second color resist block 182, and the second pixel electrode 54 corresponding to the third color resist block 581 and the fourth color resist block 582, can be made of reflective metal materials such as Cr, W, Ti, Ta, Mo, Al, Cu (or alloy materials, or composite films composed of multilayer metal films, etc.). The first pixel electrode 14 corresponding to the first white color resist block 183 and the second pixel electrode 54 corresponding to the second white color resist block 583 can be made of transparent conductive materials such as indium tin oxide (ITO), indium zinc oxide (IZO), or aluminum zinc oxide.

[0070] like Figure 5 As shown, in one embodiment, a first black matrix 19 is provided on the side of the first opposing substrate 12 near the first array substrate 11, and adjacent color resist blocks in the first color resist layer 18 are separated by the first black matrix 19. A second black matrix 59 is provided on the side of the second opposing substrate 52 near the second array substrate 51, and adjacent color resist blocks in the second color resist layer 58 are separated by the second black matrix 59.

[0071] like Figure 5As shown, in one embodiment, a first spacer layer 16 is provided on the first array substrate 11 near the first opposing substrate 12. A first pixel electrode 14 is stacked adjacent to the first spacer layer 16, with the first pixel electrode 14 located on the side of the first spacer layer 16 near the first opposing substrate 12. The surface of the first spacer layer 16 near the first pixel electrode 14 has an uneven structure, and the first pixel electrode 14 also has an uneven structure, thereby forming a diffuse reflection structure. Of course, in other embodiments, the first common electrode 15 can also be configured with an uneven structure to form a diffuse reflection structure.

[0072] A second spacer layer 56 is provided on the second array substrate 51 near the second opposing substrate 52. A second pixel electrode 54 is stacked adjacent to the second spacer layer 56, with the second pixel electrode 54 located on the side of the second spacer layer 56 near the second opposing substrate 52. The surface of the second spacer layer 56 near the second pixel electrode 54 has an uneven structure, and the second pixel electrode 54 also has an uneven structure, thus forming a diffuse reflection structure. Alternatively, in other embodiments, the second common electrode 55 can also be configured with an uneven structure to form a diffuse reflection structure.

[0073] Other structures in this embodiment are the same as or similar to those in the second embodiment, and will not be described in detail here.

[0074] The double-sided reflective display panel disclosed in this embodiment can increase the light emission angle by combining the dimming liquid crystal cell 3, the first liquid crystal cell 1, and the second liquid crystal cell 5, thereby achieving a diffuse reflection display effect. It can also achieve full-color display, realize functional diversification, meet different product needs, and enhance product competitiveness.

[0075] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A double-sided reflective display panel, characterized in that, The system includes a first liquid crystal cell (1), a first reflective layer (2), a dimming liquid crystal cell (3), a second reflective layer (4), and a second liquid crystal cell (5) arranged sequentially. The first liquid crystal cell (1) includes a first array substrate (11), a first opposing substrate (12) disposed opposite to the first array substrate (11), and a first liquid crystal layer (13) disposed between the first array substrate (11) and the first opposing substrate (12). The first opposing substrate (12) is located on the side of the first liquid crystal layer (13) away from the first reflective layer (2). The second liquid crystal cell (5) includes a second array substrate (51), a second opposing substrate (52) disposed opposite to the second array substrate (51), and a second liquid crystal layer (53) disposed between the second array substrate (51) and the second opposing substrate (52). The second opposing substrate (52) is located on the side of the second liquid crystal layer (53) away from the second reflective layer (4). The first transflective layer (2) has a first light transmission axis and a first light reflection axis. The first transflective layer (2) can transmit light parallel to the first light transmission axis and reflect light parallel to the first light reflection axis. The second transflective layer (4) has a second light transmission axis and a second light reflection axis. The second transflective layer (4) 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. The dimming liquid crystal cell (3) includes a cholesteric liquid crystal layer (33), which includes a cholesteric liquid crystal (331). The dimming liquid crystal cell (3) is used to reflect light of a specific color. A first color resist layer (18) is provided on the side of the first opposing substrate (12) near the first array substrate (11). The first color resist layer (18) includes a plurality of first color resist blocks (181), a plurality of second color resist blocks (182) and a plurality of first white color resist blocks (183) arranged in an array. The first color resist blocks (181) can selectively transmit light of a first color, the second color resist blocks (182) can selectively transmit light of a second color, and the cholesteric liquid crystal (331) can reflect light of a third color. A plurality of first pixel electrodes (14) are arranged in an array on the side of the first array substrate (11) near the first opposing substrate (12). The first pixel electrodes (14) corresponding to the first color resist blocks (181) and the second color resist blocks (182) are metal reflective electrodes, and the first pixel electrodes (14) corresponding to the first white color resist blocks (183) are transparent electrodes. And / or, a second color resist layer (58) is provided on the side of the second opposing substrate (52) near the second array substrate (51). The second color resist layer (58) includes a plurality of third color resist blocks (581), a plurality of fourth color resist blocks (582) and a plurality of second white color resist blocks (583) arranged in an array. The third color resist blocks (581) can selectively transmit light of the first color, the fourth color resist blocks (582) can selectively transmit light of the second color, and the cholesteric liquid crystal (331) can reflect light of the third color. A plurality of second pixel electrodes (54) are arranged in an array on the side of the second array substrate (51) near the second opposing substrate (52). The second pixel electrodes (54) corresponding to the third color resist blocks (581) and the fourth color resist blocks (582) are metal reflective electrodes, and the second pixel electrodes (54) corresponding to the second white color resist blocks (583) are transparent electrodes.

2. The double-sided reflective display panel as described in claim 1, characterized in that, The cholesteric liquid crystal (331) has a hazy state and a transparent state; when the cholesteric liquid crystal (331) is in a hazy state, it can scatter light to increase the emission angle of light; when the cholesteric liquid crystal (331) is in a transparent state, it has the function of transmitting light.

3. The double-sided reflective display panel as described in claim 1, characterized in that, The cholesteric liquid crystal (331) has a planar texture and is capable of reflecting light of a specific color.

4. The double-sided reflective display panel as described in claim 1, characterized in that, The first array substrate (11) has a first spacer layer (16) and a plurality of first pixel electrodes (14) arranged in an array on the side near the first opposing substrate (12). The first pixel electrodes (14) are stacked adjacent to the first spacer layer (16) and the first pixel electrodes (14) are located on the side of the first spacer layer (16) near the first opposing substrate (12). The surface of the first spacer layer (16) near the first pixel electrode (14) has an uneven structure, and the first pixel electrode (14) also has an uneven structure. And / or, a second spacer layer (56) and a plurality of second pixel electrodes (54) arranged in an array are provided on the side of the second array substrate (51) near the second opposing substrate (52). The second pixel electrodes (54) are stacked adjacent to the second spacer layer (56) and the second pixel electrodes (54) are located on the side of the second spacer layer (56) near the second opposing substrate (52). The surface of the second spacer layer (56) near the second pixel electrode (54) has an uneven structure, and the second pixel electrode (54) has an uneven structure.

5. The double-sided reflective display panel as described in claim 1, characterized in that, A third spacer layer (17) and a first common electrode (15) are provided on the side of the first opposing substrate (12) near the first array substrate (11). The first common electrode (15) and the third spacer layer (17) are stacked adjacent to each other, and the first common electrode (15) is located on the side of the third spacer layer (17) near the first array substrate (11). The surface of the third spacer layer (17) near the first common electrode (15) has an uneven structure, and the first common electrode (15) also has an uneven structure. And / or, a fourth spacer layer (57) and a second common electrode (55) are provided on the side of the second opposing substrate (52) near the second array substrate (51). The second common electrode (55) and the fourth spacer layer (57) are stacked adjacent to each other, and the second common electrode (55) is located on the side of the fourth spacer layer (57) near the second array substrate (51). The surface of the fourth spacer layer (57) near the second common electrode (55) has an uneven structure, and the second common electrode (55) has an uneven structure.

6. The double-sided reflective display panel as described in claim 1, characterized in that, Of the first color light, the second color light, and the third color light, one is red light, another is green light, and yet another is blue light.

7. The double-sided reflective display panel as described in claim 1, characterized in that, The dimming liquid crystal cell (3) further includes a first substrate (31) and a second substrate (32) disposed opposite to each other, and the cholesteric liquid crystal layer (33) is located between the first substrate (31) and the second substrate (32); a first control electrode (34) is provided on the side of the first substrate (31) near the second substrate (32), and a second control electrode (35) cooperating with the first control electrode (34) is provided on the side of the second substrate (32) near the first substrate (31).

8. The double-sided reflective display panel as described in claim 1, characterized in that, Both the first reflective layer (2) and the second reflective layer (4) are APF films or metal wire grid polarizers.

9. The double-sided reflective display panel as described in any one of claims 1-8, characterized in that, The first liquid crystal cell (1) has a first circular polarizer (61) on the side away from the first reflective layer (2), and the second liquid crystal cell (5) has a second circular polarizer (62) on the side away from the second reflective layer (4).

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