Reflective display device and driving method

Abstract

The present invention discloses a reflective display device and a driving method. The reflective display device includes an opposing substrate, an array substrate, and a liquid crystal layer. The liquid crystal layer includes first-color cholesteric liquid crystal molecules and first-color dye liquid crystal molecules. The first-color cholesteric liquid crystal molecules reflect first-color light in a reflective state. The reflective display device includes multiple pixel units, including a first pixel unit and a second pixel unit. The opposing substrate is transparent in a region corresponding to the first pixel unit and is provided with a color resist layer in a region corresponding to the second pixel unit. The array substrate is provided with a reflective layer in a region corresponding to the second pixel unit. This allows the first pixel unit to display black and a first color, and the second pixel unit to display a color corresponding to the color resist layer and black. Furthermore, the display colors of the first pixel unit and the second pixel unit can be mixed to form a plurality of colors.

Description

Technical Field

[0001] The present invention relates to the technical field of displays, and in particular to a reflective display device and a driving method thereof. Background Art

[0002] Display panels offer advantages such as lightness, durability, and low power consumption, which are energy-efficient and environmentally friendly. However, they require a backlight, resulting in thick modules and high costs. Electronic paper displays (e-paper displays) have become a popular display option. Unlike LCDs, which require a backlight, e-paper displays utilize external light sources to display images. Therefore, even in strong outdoor sunlight, information on the e-paper can still be clearly seen without viewing angle issues. Due to their power savings, high reflectivity, and contrast ratio, e-paper displays are now widely used in e-readers (e-books, e-newspapers) and other electronic components (e.g., price tags).

[0003] Existing e-paper displays typically utilize E-Ink microcapsule technology (microcapsule electronic ink technology), SiPix microcup technology (microcup electrophoretic display technology), Bridgestone electronic liquid powder technology, cholesteric liquid crystal display (CLCD) technology, microelectromechanical systems (MEMS) technology, or electrowetting technology. However, compared to LCD technology, existing e-paper display technology is less mature, with low mass production efficiency and relatively high manufacturing costs. Furthermore, existing e-paper displays cannot display color.

[0004] Existing reflective display devices using cholesteric liquid crystals (LCs) reflect only one color due to the helical pitch requirements of the LCs, while transmitting light of other colors. Consequently, single-layer LC reflective displays typically display black text on a yellow background, yellow text on a black background, red text on a black background, or black text on a red background. They are unable to achieve white text on a black background or black text on a white background, as in books. This significantly limits their application. Furthermore, cholesteric LCs reflect light with poor color, which affects the display quality. Figure 1 FIG. 1 is a schematic diagram of the structure of a reflective display device using a three-layer cholesteric liquid crystal cell in the prior art. Figure 1 As shown, if white display or color display is required, the reflective display device needs to use a three-layer cholesteric liquid crystal box to reflect red / green / blue light respectively, thereby achieving white display and color display. However, the three-layer cholesteric liquid crystal box is not only thicker but also more expensive. Summary of the Invention

[0005] In order to overcome the shortcomings and deficiencies in the prior art, the present invention aims to provide a reflective display device and a driving method thereof, so as to solve the problem of poor reflection color in the reflective display device of the prior art using a single layer of cholesteric liquid crystal.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] The present invention provides a reflective display device, comprising an opposing substrate, an array substrate disposed opposite the opposing substrate, and a liquid crystal layer located between the opposing substrate and the array substrate. The liquid crystal layer comprises first-color cholesteric liquid crystal molecules and first-color dye liquid crystal molecules that are mixed with the first-color cholesteric liquid crystal molecules. The first-color dye liquid crystal molecules rotate synchronously with the first-color cholesteric liquid crystal molecules. The first-color cholesteric liquid crystal molecules reflect first-color light in a reflective state. Pixel electrodes are provided on the array substrate, and a common electrode cooperating with the pixel electrodes is provided on the opposing substrate.

[0008] The reflective display device comprises a plurality of pixel units distributed in an array, each of the pixel units being provided with the pixel electrode, the plurality of pixel units comprising a first pixel unit and a second pixel unit, the opposing substrate being transparent in a region corresponding to the first pixel unit, the opposing substrate being provided with a color resist layer in a region corresponding to the second pixel unit, and the array substrate being provided with a reflective layer in a region corresponding to the second pixel unit;

[0009] When the first pixel unit is in a bright state, the first color cholesteric liquid crystal molecules in the area corresponding to the first pixel unit are all in a reflective state; when the first pixel unit is in a dark state, the first color cholesteric liquid crystal molecules in the area corresponding to the first pixel unit are all in a transparent state or a foggy state; when the second pixel unit is in a bright state, the first color cholesteric liquid crystal molecules in the area corresponding to the second pixel unit are all in a transparent state or a foggy state; when the second pixel unit is in a dark state, the first color cholesteric liquid crystal molecules in the area corresponding to the second pixel unit are all in a reflective state.

[0010] Furthermore, the second pixel unit includes a second color pixel unit, and the color resist layer includes a second color resist layer corresponding to the second color pixel unit, wherein the first color and the second color are complementary colors.

[0011] Furthermore, the second pixel unit includes a second color pixel unit and a third color pixel unit, and the color resist layer includes a second color resist layer corresponding to the second color pixel unit and a third color resist layer corresponding to the third color pixel unit;

[0012] The first color, the second color and the third color are each one of red, green and blue.

[0013] Furthermore, the plurality of pixel electrodes include transparent pixel electrodes and reflective pixel electrodes, the transparent pixel electrodes correspond to the first pixel units, the reflective pixel electrodes correspond to the second pixel units, and the reflective pixel electrodes are reused as the reflective layer.

[0014] Furthermore, a light absorbing layer is provided on the array substrate, and the light absorbing layer is used to absorb light passing through the liquid crystal layer.

[0015] Furthermore, a projection of the light absorbing layer on the array substrate overlaps with the first pixel unit;

[0016] Alternatively, the light absorbing layer is a planar structure that covers the entire surface of the array substrate.

[0017] Furthermore, a black matrix is ​​provided on the opposing substrate, and the black matrix corresponds to the non-display area at the edge of the reflective display device, or the black matrix is ​​provided in both the display area and the non-display area of ​​the reflective display device, and the black matrix separates the multiple pixel units from each other in the display area.

[0018] The present application also provides a driving method for a reflective display device, for driving the reflective display device as described above, the driving method comprising:

[0019] When the first pixel unit is in a bright state, the cholesteric liquid crystal molecules of the first color in the area corresponding to the first pixel unit are controlled to be in a reflective state. At this time, the liquid crystal layer in the area corresponding to the first pixel unit reflects the first color light. When the first pixel unit is in a dark state, the cholesteric liquid crystal molecules of the first color in the area corresponding to the first pixel unit are controlled to be in a transparent state or a foggy state. At this time, the light directly passes through the liquid crystal layer.

[0020] When the second pixel unit is in a bright state, the first color cholesteric liquid crystal molecules in the area corresponding to the second pixel unit are controlled to be in a transparent state or a foggy state. At this time, the second pixel unit reflects light corresponding to the color of the color resist layer; when the second pixel unit is in a dark state, the first color cholesteric liquid crystal molecules in the area corresponding to the second pixel unit are controlled to be in a reflective state, and the ambient light is absorbed by both the color resist layer and the first color dye liquid crystal molecules.

[0021] Furthermore, the second pixel unit includes a second color pixel unit, the color resist layer includes a second color resist layer corresponding to the second color pixel unit, the first color and the second color are complementary colors, and the driving method includes:

[0022] When the reflective display device displays a first color, all of the first pixel units are controlled to be in a bright state and all of the second pixel units are controlled to be in a dark state; when the reflective display device displays a second color, all of the first pixel units are controlled to be in a dark state and all of the second pixel units are controlled to be in a bright state; when the reflective display device displays white, all of the first pixel units and the second pixel units are controlled to be in a bright state.

[0023] Furthermore, the second pixel unit includes a second color pixel unit and a third color pixel unit, the color resist layer includes a second color resist layer corresponding to the second color pixel unit and a third color resist layer corresponding to the third color pixel unit, and the driving method includes:

[0024] When the reflective display device displays a first color, all the first pixel units are controlled to be in a bright state and all the second pixel units are controlled to be in a dark state; when the reflective display device displays a second color, all the first pixel units and the third color pixel units are controlled to be in a dark state and all the second color pixel units are controlled to be in a bright state; when the reflective display device displays a third color, all the first pixel units and the second color pixel units are controlled to be in a dark state and all the third color pixel units are controlled to be in a bright state; when the reflective display device displays white, all the first pixel units and the second pixel units are controlled to be in a bright state.

[0025] The beneficial effects of the present invention are as follows: by mixing first color dye liquid crystal molecules into first color cholesteric liquid crystal molecules that reflect first color light, and providing a transparent area corresponding to the first pixel unit and a color resist layer corresponding to the second pixel unit on the opposite substrate, and providing a reflective layer in the area corresponding to the second pixel unit on the array substrate, the first pixel unit can achieve a display effect of black and the first color, and the second pixel unit can achieve a display effect of black and the color corresponding to the color resist layer, and the display colors of the first pixel unit and the second pixel unit can also be mixed with each other to form more colors. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of a reflective display device using a three-layer cholesteric liquid crystal cell in the prior art;

[0027] Figure 2 is a schematic structural diagram of the reflective display device in the initial state in the first embodiment of the present invention;

[0028] Figure 3 Schematic diagram of the pixel arrangement structure of the reflective display device in the first embodiment of the present invention;

[0029] Figure 4 1 is a schematic diagram of the planar structure of the array substrate in the first embodiment of the present invention;

[0030] Figure 5 Schematic diagram of the principle of the three-state transformation of cholesteric liquid crystal in Example 1 of the present invention;

[0031] Figure 6 Schematic diagram of driving signals for the three-state transformation of cholesteric liquid crystal in the first embodiment of the present invention;

[0032] Figure 7 1 is a schematic structural diagram of the reflective display device in the first embodiment of the present invention when displaying a pure red image;

[0033] Figure 8 This is one of the structural schematic diagrams of the reflective display device in the first embodiment of the present invention when displaying a pure green image;

[0034] Figure 9 This is a second structural diagram of the reflective display device in the first embodiment of the present invention when displaying a pure green image;

[0035] Figure 10 This is one of the structural schematic diagrams of the reflective display device in the first embodiment of the present invention when displaying a pure blue image;

[0036] Figure 11 This is a second structural diagram of the reflective display device in the first embodiment of the present invention when displaying a pure blue image;

[0037] Figure 12 This is one of the structural schematic diagrams of the reflective display device in the first embodiment of the present invention when displaying a white image;

[0038] Figure 13 This is a second structural diagram of the reflective display device in the first embodiment of the present invention when displaying a white image;

[0039] Figure 14 1 is a schematic structural diagram of the reflective display device in the first embodiment of the present invention when displaying a pure black image;

[0040] Figure 15 is a schematic structural diagram of the reflective display device in the initial state in the second embodiment of the present invention;

[0041] Figure 16 is a schematic structural diagram of the reflective display device in the initial state in the third embodiment of the present invention;

[0042] Figure 17 Schematic diagram of the pixel arrangement structure of the reflective display device in the third embodiment of the present invention;

[0043] Figure 18is a schematic diagram of the planar structure of the array substrate in the third embodiment of the present invention;

[0044] Figure 19 3 is a schematic structural diagram of the reflective display device in the initial state in the fourth embodiment of the present invention. DETAILED DESCRIPTION

[0045] To further illustrate the technical means and effects of the present invention to achieve the intended purpose, the following detailed description of the reflective display device and driving method according to the present invention, including the accompanying drawings and preferred embodiments, includes the following:

[0046] [Example 1]

[0047] Figure 2 3 is a schematic structural diagram of the reflective display device in the initial state in the first embodiment of the present invention. Figure 3 Schematic diagram of the pixel arrangement structure of the reflective display device in the first embodiment of the present invention. Figure 4 It is a schematic diagram of the planar structure of the array substrate in the first embodiment of the present invention.

[0048] like Figures 2 to 4 As shown, a reflective display device provided in a first embodiment of the present invention includes an opposing substrate 11, an array substrate 12 disposed opposite the opposing substrate 11, and a liquid crystal layer 13 located between the opposing substrate 11 and the array substrate 12. The liquid crystal layer 13 includes first-color cholesteric liquid crystal molecules 131 and first-color dye liquid crystal molecules 132 that are mixed with the first-color cholesteric liquid crystal molecules 131. The first-color dye liquid crystal molecules 132 rotate synchronously with the first-color cholesteric liquid crystal molecules 131. The first-color cholesteric liquid crystal molecules 131 reflect light of the first color in a reflective state.

[0049] The reflective display device 10 includes a plurality of pixel units P arranged in an array, wherein the plurality of pixel units P include a first pixel unit P1 and a second pixel unit P2. The opposing substrate 11 is transparent in the region corresponding to the first pixel unit P1, and a color resist layer 113 is provided in the region corresponding to the second pixel unit P2. The array substrate 12 is provided with a reflective layer in the region corresponding to the second pixel unit P2. Specifically, for example, the opposing substrate 11 may provide a transparent color resist W in the region corresponding to the first pixel unit P1, and a color resist is provided in the region corresponding to the second pixel unit P2. In other embodiments, the opposing substrate 11 may not provide a transparent color resist W in the region corresponding to the first pixel unit P1, and this is not a limitation here.

[0050] When the first pixel unit P1 is in a bright state, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the region corresponding to the first pixel unit P1 are both in a flat position, so that the first color cholesteric liquid crystal molecules 131 in the region corresponding to the first pixel unit P1 are all in a reflective state. When the first pixel unit P1 is in a dark state, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the region corresponding to the first pixel unit P1 are both perpendicular to the counter substrate 11 and the array substrate 12, or are both in a disordered tilted state, so that the first color cholesteric liquid crystal molecules 131 in the region corresponding to the first pixel unit P1 are all in a transparent or foggy state. Ambient light directly passes through the liquid crystal layer 13 and is absorbed by the light absorption layer, appearing black or foggy black. When the second pixel unit P2 is in a bright state, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the second pixel unit P2 are both perpendicular to the opposing substrate 11 and the array substrate 12 or are both in a disordered tilted state, so that the first color cholesteric liquid crystal molecules 131 in the area corresponding to the second pixel unit P2 are both in a transparent state or a foggy state; when the second pixel unit P2 is in a dark state, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the second pixel unit P2 are both in a lying state, so that the first color cholesteric liquid crystal molecules 131 in the area corresponding to the second pixel unit P2 are both in a reflective state, and the ambient light is absorbed by the color resist layer 113 and the first color dye liquid crystal molecules 132, appearing black.

[0051] Furthermore, the array substrate 12 is provided with a pixel electrode 121 . Each pixel unit P is provided with a corresponding pixel electrode 121 . The pixel electrodes 121 correspond one-to-one with the pixel units P. The pixel electrodes 121 are block electrodes corresponding to the pixel units P. The counter substrate 11 is provided with a common electrode 111 that cooperates with the pixel electrodes 121 . The common electrode 111 is a planar electrode that covers the entire surface of the counter substrate 11 .

[0052] The cholesteric liquid crystal in the first-color cholesteric liquid crystal molecules 131 has three stable textures: the P state (Planar, reflective), the FC state (Focal Conic, foggy), and the H state (transparent). In the P state, the cholesteric liquid crystal's reflection spectrum is within the visible spectrum, and it reflects bright colored light. The specific color of the reflected light can be set based on the cholesteric liquid crystal's helical pitch. In the FC state, the cholesteric liquid crystal no longer reflects the colored light, allowing light to scatter and pass through it. In the H state, the cholesteric liquid crystal no longer reflects the colored light, allowing light to pass directly through it without any scattering effect. These three states can transition between each other under a certain electric field.

[0053] Figure 5This is a schematic diagram of the principle of the three-state transformation of cholesteric liquid crystal in the present invention. Figure 6 Schematic diagram of the driving signal for the three states of the cholesteric liquid crystal in the present invention. Figure 5 and Figure 6 As shown, a common voltage signal Vcom is applied to the common electrode 111, and a first electrical signal V1 is continuously applied to the pixel electrode 121. There is a voltage difference (about 20V) between the common voltage signal Vcom and the first electrical signal V1. A strong vertical electric field is formed between the common electrode 111 and the pixel electrode 121, and the first color cholesteric liquid crystal molecules 131 rotate and stagnate in the H state (transparent state). A common voltage signal Vcom is applied to the common electrode 111, and a second electrical signal V2 is applied to the pixel electrode 121. A voltage difference (e.g., 20V) exists between the second electrical signal V2 and the common voltage signal Vcom, and the second electrical signal V2 gradually becomes the same as the common voltage signal Vcom within a first preset time. That is, the second electrical signal V2 first has a large voltage difference with the common voltage signal Vcom, and then slowly decreases and becomes the same as the common voltage signal Vcom. Therefore, a strong vertical electric field is first formed between the common electrode 111 and the pixel electrode 121, and then the vertical electric field slowly disappears, causing the cholesteric liquid crystals in the first color cholesteric liquid crystal molecules 131 to rotate and stagnate in the FC state, which is a scattering state and has a light-scattering effect. A common voltage signal Vcom is applied to the common electrode 111, and a third electrical signal V3 is applied to the pixel electrode 121. A voltage difference (e.g., 30V) exists between the third electrical signal V3 and the common voltage signal Vcom. The third electrical signal V3 directly becomes equal to the common voltage signal Vcom at a second preset time, which is shorter than the first preset time. This means that the third electrical signal V3 initially has a large voltage difference from the common voltage signal Vcom, then rapidly decreases and becomes equal to the common voltage signal Vcom. Consequently, a strong vertical electric field is first formed between the common electrode 111 and the pixel electrode 121, which then quickly disappears, causing the first-color cholesteric liquid crystal molecules 131 to rotate and stagnate in the P state, a reflective state. The cholesteric liquid crystals, due to their different arrangement directions, reflect different visible light spectra, while the remaining spectrum is transmitted. The P and FC states do not require voltage to maintain. The reflection spectrum band (Δλ) of cholesteric liquid crystal molecules is proportional to their helical pitch (Po) and average refractive index (n=(ne+no) / 2), using the formula: Δλ=nPo. Therefore, cholesteric liquid crystal molecules with different helical pitches reflect different colors of light in their reflective state.

[0054] The first color liquid crystal molecules 132 are positive dye liquid crystal molecules. The light absorption capacity of the long axis of the positive dye liquid crystal molecules is greater than that of the short axis. Positive dye liquid crystal molecules have the characteristic of strong light absorption along their long axis and weak light absorption along their short axis. The long axis absorbs some light, thereby displaying the color corresponding to the first color liquid crystal molecules 132. For example, if the first color liquid crystal molecules 132 are purple dye liquid crystal molecules, the long axis of the purple dye liquid crystal molecules can absorb the green wavelength band, resulting in a purple appearance. Similarly, if the first color liquid crystal molecules 132 are red dye liquid crystal molecules, the long axis of the red dye liquid crystal molecules can absorb the cyan wavelength band, resulting in a red appearance. Of course, the first color liquid crystal molecules 132 can also be dye liquid crystal molecules of other single colors, such as blue, green, or yellow.

[0055] In this embodiment, the second pixel unit P2 includes a second color pixel unit P21 and a third color pixel unit P22. The color filter layer 113 includes a second color filter layer 113a corresponding to the second color pixel unit P21 and a third color filter layer 113b corresponding to the third color pixel unit P22. A column of second color pixel units P21, a column of third color pixel units P22, and a column of first pixel units P1 are periodically arranged in the row direction. The first color, the second color, and the third color are each one of red, green, and blue. In this embodiment, the first color cholesteric liquid crystal molecules 131 are red cholesteric liquid crystal molecules, the first color dye liquid crystal molecules 132 are red dye liquid crystal molecules, the second color filter layer 113a is a green filter, and the third color filter layer 113b is a blue filter. Of course, in other embodiments, the first color cholesteric liquid crystal molecules 131 are red cholesteric liquid crystal molecules, the first color dye liquid crystal molecules 132 are red dye liquid crystal molecules, the second color resist layer 113a is blue resist, and the third color resist layer 113b is green resist; or, the first color cholesteric liquid crystal molecules 131 are green cholesteric liquid crystal molecules, the first color dye liquid crystal molecules 132 are green dye liquid crystal molecules, the second color resist layer 113a is red resist, and the third color resist layer 113b is blue resist; or, the first color cholesteric liquid crystal molecules 131 are green cholesteric liquid crystal molecules, the first color dye liquid crystal molecules 132 are green dye liquid crystal molecules, the second color resist layer 113a is red resist, and the third color resist layer 113b is blue resist; 132 is a green dye liquid crystal molecule, the second color resist layer 113a is a blue color resist, and the third color resist layer 113b is a red color resist; alternatively, the first color cholesteric liquid crystal molecule 131 is a blue cholesteric liquid crystal molecule, the first color dye liquid crystal molecule 132 is a blue dye liquid crystal molecule, the second color resist layer 113a is a red color resist, and the third color resist layer 113b is a green color resist; alternatively, the first color cholesteric liquid crystal molecule 131 is a blue cholesteric liquid crystal molecule, the first color dye liquid crystal molecule 132 is a blue dye liquid crystal molecule, the second color resist layer 113a is a green color resist, and the third color resist layer 113b is a red color resist. This is not limited here.

[0056] like Figure 4 As shown, the array substrate 12 is provided with a plurality of scan lines 101 and a plurality of data lines 102. The plurality of scan lines 101 and the plurality of data lines 102 are insulated from each other and cross to define a plurality of pixel units P. The array substrate 12 is provided with a thin film transistor 103 and a pixel electrode 121 in each pixel unit P. The pixel electrode 121 is electrically connected to the scan line 101 and the data line 102 adjacent to the thin film transistor 103 through the thin film transistor 103. The thin film transistor 103 includes a gate, an active layer, a drain, and a source. The gate and the scan line 101 are located on the same layer and are electrically connected. The gate and the active layer are separated by an insulating layer. The source is electrically connected to the data line 102, and the drain is electrically connected to the pixel electrode 121 through a contact hole.

[0057] In this embodiment, the plurality of pixel electrodes 121 include a transparent pixel electrode 121a and a reflective pixel electrode 121b. The transparent pixel electrode 121a corresponds to the first pixel unit P1, and the reflective pixel electrode 121b corresponds to the second pixel unit P2. The reflective pixel electrode 121b also serves as a reflective layer. The transparent pixel electrode 121a can be made of a transparent electrode such as indium tin oxide (ITO) or indium zinc oxide (IZO), while the reflective pixel electrode 121b can be made of a transparent electrode such as indium tin oxide (ITO) or indium zinc oxide (IZO) and aluminum (Al) or silver (Ag). For example, the transparent pixel electrode 121a and the reflective pixel electrode 121b are first etched from the same transparent conductive layer, and then a layer of aluminum (Al) or silver (Ag) is coated on the reflective pixel electrode 121b to increase the conductivity of the reflective pixel electrode 121b. Of course, the reflective pixel electrode 121b can also be made of aluminum (Al) or silver (Ag) alone. Alternatively, in other embodiments, the pixel electrodes 121 may all be made of transparent electrodes such as indium tin oxide (ITO) or indium zinc oxide (IZO), while the reflective layer may be made of a single layer of aluminum (Al) or silver (Ag).

[0058] Furthermore, a light absorbing layer 122 is provided on the array substrate 12. The light absorbing layer 122 is used to absorb light that passes through the liquid crystal layer 13, thereby making the reflective display device 10 darker in the black state to improve the contrast. Optionally, the light absorbing layer 122 uses black ink. The L value (representing lightness and darkness) of the black ink is greater than 25 and the OD value (optical density) is greater than 4. As a result, the light absorbing layer 122 has the characteristics of high blackness and good glossiness, ensuring that the black screen is darker. Of course, the light absorbing layer 122 can be made of BM material. In this embodiment, the light absorbing layer 122 is a planar structure that covers the entire surface of the array substrate 12. The light absorbing layer 122 covers the side of the array substrate 12 away from the liquid crystal layer 13.

[0059] Furthermore, a black matrix 112 is provided on the counter substrate 11. The black matrix 112 corresponds to the non-display area at the edge of the reflective display device 10. The black matrix 112 is not required in the display area of ​​the reflective display device 10. In this embodiment, the second color resist layer 113a and the third color resist layer 113b of the color resist layer 113 in the counter substrate 11 correspond to the respective pixel electrodes 121 in the array substrate 12. That is, a gap is provided between the second color resist layer 113a and the third color resist layer 113b, and this gap corresponds to the scan lines 101, data lines 102, and thin-film transistors 103 on the counter substrate 11. Because the scan lines 101, data lines 102, and thin-film transistors 103 on the counter substrate 11 are made of metal, the scan lines 101, data lines 102, and thin-film transistors 103 in this gap can reflect ambient light to a certain extent, thereby improving display brightness. In other embodiments, a transparent color resist W may also be disposed in the gap between the second color resist layer 113 a and the third color resist layer 113 b , which is not limited here.

[0060] The present application also provides a driving method for a reflective display device, which is used to drive the reflective display device 10 as described above. The driving method includes:

[0061] When the first pixel unit P1 is in a bright state, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the first pixel unit P1 are controlled to lie flat, so that the first color cholesteric liquid crystal molecules 131 in the area corresponding to the first pixel unit P1 are all in a reflective state. At this time, the liquid crystal layer 13 in the area corresponding to the first pixel unit P1 reflects the first color light. The first color cholesteric liquid crystal molecules 131 can reflect the first color light (red light), while the first color dye liquid crystal molecules 132 can filter the reflected light, making the color of the reflected light purer. When the first pixel unit P1 is in a dark state, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the first pixel unit P1 are controlled to be perpendicular to the opposing substrate 11 and the array substrate 12, or to be in a disordered tilted state. The first color cholesteric liquid crystal molecules 131 in the area corresponding to the first pixel unit P1 are all in a transparent or foggy state. At this time, ambient light directly passes through the liquid crystal layer 13 and is absorbed by the light absorption layer 122, appearing black or foggy black.

[0062] When the second pixel unit P2 is in a bright state, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the second pixel unit P2 are controlled to be perpendicular to the opposing substrate 11 and the array substrate 12, or to be in a disordered tilted state, so that the first color cholesteric liquid crystal molecules 131 in the area corresponding to the second pixel unit P2 are all in a transparent or foggy state. At this time, the second pixel unit P2 reflects light corresponding to the color of the color filter layer 113. When the second pixel unit P2 is in a dark state, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the second pixel unit P2 are controlled to be in a flat position, so that the first color cholesteric liquid crystal molecules 131 in the area corresponding to the second pixel unit P2 are all in a reflective state. Ambient light is absorbed by the color filter layer 113 and the first color dye liquid crystal molecules 132, resulting in a black color.

[0063] Figure 7 Schematic diagram of the structure of the reflective display device in the first embodiment of the present invention when displaying a pure red image. Figure 7 As shown, when the reflective display device 10 displays the first color (red), all first pixel units P1 are controlled to be in a bright state and all second pixel units P2 are controlled to be in a dark state. Specifically, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the first pixel unit P1 are controlled to be in a flat position, so that the first color cholesteric liquid crystal molecules 131 in the area corresponding to the first pixel unit P1 are in a reflective state, and the liquid crystal layer 13 in the area corresponding to the first pixel unit P1 reflects the first color light (red light). In addition, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the second pixel unit P2 (the second color pixel unit P21 and the third color pixel unit P22) are controlled to be in a flat position, so that the first color cholesteric liquid crystal molecules 131 in the area corresponding to the second pixel unit P2 are in a reflective state. The ambient light is absorbed by the color resist layer 113 and the first color dye liquid crystal molecules 132, resulting in a black display.

[0064] Figure 8 This is one of the structural schematic diagrams of the reflective display device in the first embodiment of the present invention when displaying a pure green image. Figure 9 This is the second structural diagram of the reflective display device in the first embodiment of the present invention when displaying a pure green image. Figure 8 and Figure 9 As shown, when the reflective display device 10 displays the second color (green), all the first pixel units P1 and the third color pixel units P22 are controlled to be in the dark state and all the second color pixel units P21 are controlled to be in the bright state. Figure 8As shown, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the first pixel unit P1 are controlled to be perpendicular to the opposing substrate 11 and the array substrate 12, so that the first color cholesteric liquid crystal molecules 131 in the area corresponding to the first pixel unit P1 are all in a transparent state. At this time, the ambient light directly passes through the liquid crystal layer 13 and is absorbed by the light absorption layer 122, appearing black; and the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the third color pixel unit P22 are controlled to be in a flat position, so that the area corresponding to the third color pixel unit P22 is The first color cholesteric liquid crystal molecules 131 are all in a reflective state, and the ambient light is absorbed by the color filter layer 113 and the first color dye liquid crystal molecules 132, showing black; and the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the second color pixel unit P21 are controlled to be perpendicular to the opposing substrate 11 and the array substrate 12, so that the first color cholesteric liquid crystal molecules 131 in the area corresponding to the second color pixel unit P21 are all in a transparent state. At this time, the second color pixel unit P21 reflects the light corresponding to the color of the second color filter layer 113a (green light). Or, Figure 9 As shown, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the first pixel unit P1 are controlled to be perpendicular to the opposite substrate 11 and the array substrate 12, so that the first color cholesteric liquid crystal molecules 131 in the area corresponding to the first pixel unit P1 are all in a transparent state. At this time, the ambient light directly passes through the liquid crystal layer 13 and is absorbed by the light absorption layer 122, appearing black; and the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the third color pixel unit P22 are controlled to be in a flat position, so that the first color cholesteric liquid crystal molecules 131 in the area corresponding to the third color pixel unit P22 are all in a reflective state. The first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the second color pixel unit P21 are controlled to be in a disordered tilted state, so that the first color cholesteric liquid crystal molecules 131 in the area corresponding to the second color pixel unit P21 are all in a foggy state. At this time, the second color pixel unit P21 reflects light corresponding to the color of the second color filter layer 113a (green light). Since the first color cholesteric liquid crystal molecules 131 are in a foggy state, the second color pixel unit P21 is in a slow reflective state, achieving a foggy green display effect. Of course, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the first pixel unit P1 can also be controlled to be in a disordered tilted state, so that the first color cholesteric liquid crystal molecules 131 in the area corresponding to the first pixel unit P1 are all in a foggy state. In this case, the ambient light directly passes through the liquid crystal layer 13 and is absorbed by the light absorption layer 122, resulting in a foggy black display effect.

[0065] Figure 10 This is one of the structural diagrams of the reflective display device in the first embodiment of the present invention when displaying a pure blue image. Figure 11 This is the second structural diagram of the reflective display device in the first embodiment of the present invention when displaying a pure blue image. Figure 10 and Figure 11 As shown, when the reflective display device 10 displays the third color (blue), all the first pixel units P1 and the second color pixel units P21 are controlled to be in the dark state and all the third color pixel units P22 are controlled to be in the bright state. Figure 10 As shown, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the first pixel unit P1 are controlled to be perpendicular to the opposing substrate 11 and the array substrate 12, so that the first color cholesteric liquid crystal molecules 131 in the area corresponding to the first pixel unit P1 are all in a transparent state. At this time, the ambient light directly passes through the liquid crystal layer 13 and is absorbed by the light absorption layer 122, appearing black; and the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the second color pixel unit P21 are controlled to be in a flat position, so that the area corresponding to the second color pixel unit P21 is The first color cholesteric liquid crystal molecules 131 are all in a reflective state, and the ambient light is absorbed by the color filter layer 113 and the first color dye liquid crystal molecules 132, showing black; and the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the third color pixel unit P22 are controlled to be perpendicular to the opposing substrate 11 and the array substrate 12, so that the first color cholesteric liquid crystal molecules 131 in the area corresponding to the third color pixel unit P22 are all in a transparent state. At this time, the third color pixel unit P22 reflects the light corresponding to the color of the third color filter layer 113b (blue light). Or, Figure 11As shown, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the first pixel unit P1 are controlled to be perpendicular to the opposing substrate 11 and the array substrate 12, so that the first color cholesteric liquid crystal molecules 131 in the area corresponding to the first pixel unit P1 are all in a transparent state. At this time, the ambient light directly passes through the liquid crystal layer 13 and is absorbed by the light absorption layer 122, appearing black; and the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the second color pixel unit P21 are controlled to be in a flat position, so that the first color cholesteric liquid crystal molecules 131 in the area corresponding to the second color pixel unit P21 are all in a reflective state. The first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the third color pixel unit P22 are controlled to be in a disordered tilted state, so that the first color cholesteric liquid crystal molecules 131 in the area corresponding to the third color pixel unit P22 are all in a foggy state. In this case, the third color pixel unit P22 reflects light corresponding to the color of the third color filter layer 113b (blue light). Since the first color cholesteric liquid crystal molecules 131 are in a foggy state, the third color pixel unit P22 is in a slow reflective state, achieving a foggy blue display effect. Of course, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the first pixel unit P1 can also be controlled to be in a disordered tilted state, so that the first color cholesteric liquid crystal molecules 131 in the area corresponding to the first pixel unit P1 are all in a foggy state. In this case, the ambient light directly passes through the liquid crystal layer 13 and is absorbed by the light absorption layer 122, resulting in a foggy black display effect.

[0066] Figure 12 This is one of the structural schematic diagrams of the reflective display device in the first embodiment of the present invention when displaying a white image. Figure 13 This is the second structural diagram of the reflective display device in the first embodiment of the present invention when displaying a white image. Figure 12 and Figure 13 As shown, when the reflective display device 10 displays white, all the first pixel units P1 and the second pixel units P2 (the second color pixel units P21 and the third color pixel units P22) are controlled to be in a bright state. Figure 12As shown, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the first pixel unit P1 are controlled to be in a flat position, so that the first color cholesteric liquid crystal molecules 131 in the area corresponding to the first pixel unit P1 are in a reflective state. At this time, the liquid crystal layer 13 in the area corresponding to the first pixel unit P1 reflects the first color light (red light); and the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the second color pixel unit P21 are controlled to be perpendicular to the opposite substrate 11 and the array substrate 12, so that the area corresponding to the second color pixel unit P21 The first color cholesteric liquid crystal molecules 131 are all in a transparent state. At this time, the second color pixel unit P21 reflects the light corresponding to the color of the second color filter layer 113a (green light); and the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the corresponding area of ​​the third color pixel unit P22 are controlled to be perpendicular to the opposing substrate 11 and the array substrate 12, so that the first color cholesteric liquid crystal molecules 131 in the corresponding area of ​​the third color pixel unit P22 are all in a transparent state. At this time, the third color pixel unit P22 reflects the light corresponding to the color of the third color filter layer 113b (blue light). Or, as Figure 13 As shown, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the first pixel unit P1 are controlled to be in a flat position, so that the first color cholesteric liquid crystal molecules 131 in the area corresponding to the first pixel unit P1 are in a reflective state. At this time, the liquid crystal layer 13 in the area corresponding to the first pixel unit P1 reflects the first color light (red light); and the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the second color pixel unit P21 are controlled to be in a disordered tilted state, so that the first color cholesteric liquid crystal molecules 131 in the area corresponding to the second color pixel unit P21 are in a foggy state. At this time, the second color pixel unit P21 reflects the second color color resist layer 11. In the example, the first color cholesteric liquid crystal molecules 131 are in a foggy state, and the second color pixel unit P21 is in a slow reflective state, achieving a foggy green display effect. Furthermore, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the third color pixel unit P22 are controlled to be in a disordered tilted state, so that the first color cholesteric liquid crystal molecules 131 in the area corresponding to the third color pixel unit P22 are all in a foggy state. At this time, the third color pixel unit P22 reflects the light corresponding to the color of the third color filter layer 113b (blue light). Since the first color cholesteric liquid crystal molecules 131 are in a foggy state, the third color pixel unit P22 is in a slow reflective state, achieving a foggy blue display effect. The red, green, and blue light rays are mixed to form white light.

[0067] Figure 14Schematic diagram of the structure of the reflective display device in the first embodiment of the present invention when displaying a pure black image. Figure 14 As shown, when the reflective display device 10 is displaying a pure black image, all of the first pixel units P1 and the second pixel units P2 (the second color pixel units P21 and the third color pixel units P22) are controlled to be in a dark state. Specifically, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the region corresponding to the first pixel units P1 are controlled to be perpendicular to the opposing substrate 11 and the array substrate 12, so that the first color cholesteric liquid crystal molecules 131 in the region corresponding to the first pixel units P1 are all in a transparent state. At this time, ambient light directly passes through the liquid crystal layer 13 and is absorbed by the light absorption layer 122, resulting in a black image. Furthermore, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the region corresponding to the second pixel units P2 are controlled to be in a flat position. Therefore, the first color cholesteric liquid crystal molecules 131 in the region corresponding to the second pixel units P2 (the second color pixel units P21 and the third color pixel units P22) are all in a reflective state. The ambient light is absorbed by both the color resist layer 113 and the first color dye liquid crystal molecules 132, resulting in a black image. Of course, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the first pixel unit P1 can also be controlled to be in a disordered tilted state, so that the first color cholesteric liquid crystal molecules 131 in the area corresponding to the first pixel unit P1 are all in a foggy state. At this time, the ambient light directly passes through the liquid crystal layer 13 and is absorbed by the light absorbing layer 122, presenting a foggy black color.

[0068] In this embodiment, the reflective display device 10 can also display color. When the reflective display device 10 is displaying color, it is sufficient to control the corresponding first pixel unit P1, the second color pixel unit P21, and the third color pixel unit P22 to be in a bright state. Specifically, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the corresponding area of ​​the corresponding first pixel unit P1 are controlled to be in a lying posture, so that the first color cholesteric liquid crystal molecules 131 in the corresponding area of ​​the first pixel unit P1 are in a reflective state. At this time, the liquid crystal layer 13 in the corresponding area of ​​the first pixel unit P1 reflects the first color light (red light); and the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the corresponding area of ​​the corresponding second color pixel unit P21 are controlled to be perpendicular to the opposing substrate 11 and the array substrate 12 or to be in a disordered tilted state, so that the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the corresponding area of ​​the ... The first-color cholesteric liquid crystal molecules 131 are all in a transparent or foggy state. In this case, the second-color pixel unit P21 reflects light corresponding to the color of the second-color color filter layer 113a (green light). Furthermore, the first-color cholesteric liquid crystal molecules 131 and the first-color dye liquid crystal molecules 132 in the corresponding area of ​​the corresponding third-color pixel unit P22 are controlled to be perpendicular to the opposing substrate 11 and the array substrate 12, or to be in a disordered tilted state. This makes the first-color cholesteric liquid crystal molecules 131 in the corresponding area of ​​the third-color pixel unit P22 all in a transparent or foggy state. In this case, the third-color pixel unit P22 reflects light corresponding to the color of the third-color color filter layer 113b (blue light). Based on the principle of mutual mixing of red, green, and blue light, various colors of light are formed, thereby achieving color display.

[0069] [Example 2]

[0070] Figure 15 FIG. 1 is a schematic structural diagram of the reflective display device in the initial state in the second embodiment of the present invention. Figure 15 As shown, the reflective display device and driving method provided in the second embodiment of the present invention are similar to those in the first embodiment ( Figures 1 to 14 ) are substantially the same, except that, in this embodiment:

[0071] A black matrix 112 is provided on the counter substrate 11. The black matrix 112 is provided in both the display area and the non-display area of ​​the reflective display device 10. The black matrix 112 separates the multiple pixel units P from each other in the display area. Compared to the first embodiment, this embodiment avoids the problem of color mixing between adjacent pixel units P, but the brightness of the reflective display device 10 is reduced.

[0072] It should be understood by those skilled in the art that the remaining structures and working principles of this embodiment are the same as those of the first embodiment and will not be described in detail here.

[0073] [Example 3]

[0074] Figure 16 3 is a schematic structural diagram of the reflective display device in the initial state in the third embodiment of the present invention. Figure 17 Schematic diagram of the pixel arrangement structure of the reflective display device in the third embodiment of the present invention. Figure 18 FIG. 1 is a schematic diagram of the planar structure of the array substrate in the third embodiment of the present invention. Figures 16 to 18 As shown, the reflective display device and driving method provided in the third embodiment of the present invention are similar to those in the first embodiment ( Figures 1 to 14 ), Example 2 ( Figure 15 ) are substantially the same, except that, in this embodiment:

[0075] The second pixel unit P2 includes a second color pixel unit P21, and the color filter layer 113 includes a second color filter layer 113a corresponding to the second color pixel unit P21. The first color and the second color are complementary colors. That is, the second pixel unit P2 only includes the second color pixel unit P21, and the color filter layer 113 only includes the second color filter layer 113a. The plurality of pixel units P include pixel units P of two colors. A column of first pixel units P1 and a column of second color pixel units P21 are arranged alternately in the row direction. In this embodiment, the first color cholesteric liquid crystal molecules 131 are red cholesteric liquid crystal molecules, the first color dye liquid crystal molecules 132 are red dye liquid crystal molecules, and the second color filter layer 113a is a cyan filter. Of course, in other embodiments, the first color and the second color can also be other complementary colors, so that they can be mixed to produce a white image.

[0076] The present application also provides a driving method for a reflective display device, which is used to drive the reflective display device 10 as described above. The driving method includes:

[0077] When the reflective display device 10 displays the first color (red), all first pixel units P1 are controlled to be in a bright state and all second pixel units P2 are controlled to be in a dark state. Specifically, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the region corresponding to the first pixel unit P1 are controlled to lie flat, so that the first color cholesteric liquid crystal molecules 131 in the region corresponding to the first pixel unit P1 are all in a reflective state, and the liquid crystal layer 13 in the region corresponding to the first pixel unit P1 reflects the first color light (red light). Furthermore, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the region corresponding to the second pixel unit P2 (second color pixel unit P21) are controlled to lie flat, so that the first color cholesteric liquid crystal molecules 131 in the region corresponding to the second pixel unit P2 are all in a reflective state. The ambient light is absorbed by both the color resist layer 113 and the first color dye liquid crystal molecules 132, resulting in a black display.

[0078] When the reflective display device 10 displays the second color (cyan), all first pixel units P1 are controlled to be in a dark state, and all second pixel units P2 are controlled to be in a bright state. Specifically, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the region corresponding to the first pixel unit P1 are controlled to be perpendicular to the counter substrate 11 and the array substrate 12, so that the first color cholesteric liquid crystal molecules 131 in the region corresponding to the first pixel unit P1 are all in a transparent state. In this case, ambient light directly passes through the liquid crystal layer 13 and is absorbed by the light absorption layer 122, resulting in a black appearance. Furthermore, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the region corresponding to the second pixel unit P2 (second color pixel unit P21) are controlled to be perpendicular to the counter substrate 11 and the array substrate 12, or to be in a disordered tilted state. This causes the first color cholesteric liquid crystal molecules 131 in the region corresponding to the second pixel unit P2 to be in a transparent or foggy state. In this case, the second pixel unit P2 reflects light corresponding to the color of the second color resist layer 113a (cyan light).

[0079] When the reflective display device 10 displays white, all first pixel units P1 and second pixel units P2 are controlled to be in a bright state. Specifically, the first-color cholesteric liquid crystal molecules 131 and the first-color dye liquid crystal molecules 132 in the region corresponding to the first pixel unit P1 are controlled to lie flat, so that the first-color cholesteric liquid crystal molecules 131 in the region corresponding to the first pixel unit P1 are all in a reflective state, and the liquid crystal layer 13 in the region corresponding to the first pixel unit P1 reflects the first-color light (red light). Furthermore, the first-color cholesteric liquid crystal molecules 131 and the first-color dye liquid crystal molecules 132 in the region corresponding to the second pixel unit P2 (second-color pixel unit P21) are controlled to be perpendicular to the counter substrate 11 and the array substrate 12, or to be in a disordered tilted state, so that the first-color cholesteric liquid crystal molecules 131 in the region corresponding to the second pixel unit P2 are all in a transparent or foggy state. In this case, the second pixel unit P2 reflects light corresponding to the color of the second color resist layer 113a (cyan light). The red and cyan light rays are mixed to form white light.

[0080] When the reflective display device 10 displays a pure black image, all first pixel units P1 and second pixel units P2 (second color pixel units P21) are controlled to be in a dark state. Specifically, the first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the corresponding area of ​​the first pixel unit P1 are controlled to be perpendicular to the opposing substrate 11 and the array substrate 12, so that the first color cholesteric liquid crystal molecules 131 in the corresponding area of ​​the first pixel unit P1 are all in a transparent state. At this time, ambient light directly passes through the liquid crystal layer 13 and is absorbed by the light absorption layer 122, resulting in a black image. The first color cholesteric liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the corresponding area of ​​the second pixel unit P2 are controlled to be in a flat position, so that the first color cholesteric liquid crystal molecules 131 in the corresponding area of ​​the second pixel unit P2 are all in a reflective state. The ambient light is absorbed by both the color resist layer 113 and the first color dye liquid crystal molecules 132, resulting in a black image.

[0081] It should be understood by those skilled in the art that the remaining structures and working principles of this embodiment are the same as those of the first and second embodiments, and will not be described in detail here.

[0082] [Example 4]

[0083] Figure 19 FIG. 1 is a schematic structural diagram of the reflective display device in the initial state in the fourth embodiment of the present invention. Figure 19 As shown, the reflective display device and driving method provided in the fourth embodiment of the present invention are similar to those in the first embodiment ( Figures 1 to 14 ), Example 2 ( Figure 15 ), Example 3 ( Figures 16 to 18) are substantially the same as those in the reflective display device and driving method described above, with the difference being that, in this embodiment, a light absorbing layer 122 is provided on the array substrate 12. The light absorbing layer 122 is used to absorb light that passes through the liquid crystal layer 13, thereby making the reflective display device 10 appear darker in the black state and improving contrast. Optionally, the light absorbing layer 122 is made of black ink with an L value (representing lightness and darkness) greater than 25 and an OD value (optical density) greater than 4. This gives the light absorbing layer 122 high blackness and good glossiness, ensuring that black images appear darker. Of course, the light absorbing layer 122 can be made of BM. In this embodiment, the projection of the light absorbing layer 122 on the array substrate 12 overlaps with the first pixel unit P1, meaning that the light absorbing layer 122 is only provided in the area of ​​the array substrate 12 corresponding to the first pixel unit P1. The light absorbing layer 122 can be provided on the side of the array substrate 12 facing the liquid crystal layer 13 and stacked with the transparent pixel electrode 121a.

[0084] It should be understood by those skilled in the art that the remaining structures and working principles of this embodiment are the same as those of Embodiment 1, Embodiment 2, and Embodiment 3, and will not be described in detail here.

[0085] In this document, directional terms such as "up," "down," "left," "right," "front," and "back" are defined based on the positions of structures in the accompanying drawings and their relative positions to each other, for the sake of clarity and convenience in presenting the technical solution. It should be understood that the use of these directional terms does not limit the scope of protection claimed in this application. It should also be understood that the terms "first" and "second," etc., used herein, are used solely for distinctions and are not intended to limit quantity or order.

[0086] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with this profession can make some changes or modifications to the technical contents disclosed above without departing from the scope of the technical solution of the present invention, which are equivalent embodiments of equivalent changes. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. A reflective display device, characterized in that: The invention comprises an opposing substrate (11), an array substrate (12) arranged opposite to the opposing substrate (11), and a liquid crystal layer (13) located between the opposing substrate (11) and the array substrate (12); the liquid crystal layer (13) comprises first-color cholesteric liquid crystal molecules (131) and first-color dye liquid crystal molecules (132) mixed with the first-color cholesteric liquid crystal molecules (131); the first-color dye liquid crystal molecules (132) rotate synchronously with the first-color cholesteric liquid crystal molecules (131); the first-color cholesteric liquid crystal molecules (131) reflect first-color light in a reflective state; the array substrate (12) is provided with a pixel electrode (121); and the opposing substrate (11) is provided with a common electrode (111) matched with the pixel electrode (121); The reflective display device (10) has a plurality of pixel units (P) distributed in an array, each of the pixel units (P) is provided with a corresponding pixel electrode (121), the plurality of pixel units (P) include a first pixel unit (P1) and a second pixel unit (P2), the opposing substrate (11) is transparent in a region corresponding to the first pixel unit (P1), the opposing substrate (11) is provided with a color resist layer (113) in a region corresponding to the second pixel unit (P2), and the array substrate (12) is provided with a reflective layer in a region corresponding to the second pixel unit (P2); When the first pixel unit (P1) is in a bright state, the first color cholesteric liquid crystal molecules (131) in the area corresponding to the first pixel unit (P1) are all in a reflective state; when the first pixel unit (P1) is in a dark state, the first color cholesteric liquid crystal molecules (131) in the area corresponding to the first pixel unit (P1) are all in a transparent state or a foggy state; when the second pixel unit (P2) is in a bright state, the first color cholesteric liquid crystal molecules (131) in the area corresponding to the second pixel unit (P2) are all in a transparent state or a foggy state; when the second pixel unit (P2) is in a dark state, the first color cholesteric liquid crystal molecules (131) in the area corresponding to the second pixel unit (P2) are all in a reflective state.

2. The reflective display device according to claim 1, wherein: The second pixel unit (P2) includes a second color pixel unit (P21), and the color resist layer (113) includes a second color resist layer (113a) corresponding to the second color pixel unit (P21), wherein the first color and the second color are complementary colors.

3. The reflective display device according to claim 1, wherein: The second pixel unit (P2) includes a second color pixel unit (P21) and a third color pixel unit (P22); the color resist layer (113) includes a second color resist layer (113a) corresponding to the second color pixel unit (P21) and a third color resist layer (113b) corresponding to the third color pixel unit (P22); The first color, the second color and the third color are each one of red, green and blue.

4. The reflective display device according to claim 1, wherein: The plurality of pixel electrodes (121) include a transparent pixel electrode (121a) and a reflective pixel electrode (121b), wherein the transparent pixel electrode (121a) corresponds to the first pixel unit (P1), the reflective pixel electrode (121b) corresponds to the second pixel unit (P2), and the reflective pixel electrode (121b) is reused as the reflective layer.

5. The reflective display device according to claim 1, wherein: A light absorbing layer (122) is provided on the array substrate (12), and the light absorbing layer (122) is used to absorb light passing through the liquid crystal layer (13).

6. The reflective display device according to claim 5, wherein: The projection of the light absorbing layer (122) on the array substrate (12) overlaps with the first pixel unit (P1); Alternatively, the light absorbing layer (122) is a planar structure that entirely covers the array substrate (12).

7. The reflective display device according to claim 1, wherein: A black matrix (112) is provided on the opposing substrate (11), the black matrix (112) corresponding to a non-display area at the edge of the reflective display device (10), or the black matrix (112) is provided in both the display area and the non-display area of ​​the reflective display device (10), and the black matrix (112) separates a plurality of pixel units (P) from each other in the display area.

8. A method for driving a reflective display device, characterized in that: For driving the reflective display device (10) according to any one of claims 1 to 7, the driving method comprising: When the first pixel unit (P1) is in a bright state, the first color cholesteric liquid crystal molecules (131) in the area corresponding to the first pixel unit (P1) are controlled to be in a reflective state, and at this time, the liquid crystal layer (13) in the area corresponding to the first pixel unit (P1) reflects the first color light; when the first pixel unit (P1) is in a dark state, the first color cholesteric liquid crystal molecules (131) in the area corresponding to the first pixel unit (P1) are controlled to be in a transparent state or a foggy state, and at this time, the light directly passes through the liquid crystal layer (13); When the second pixel unit (P2) is in a bright state, the first color cholesteric liquid crystal molecules (131) in the area corresponding to the second pixel unit (P2) are controlled to be in a transparent state or a foggy state. At this time, the second pixel unit (P2) reflects light corresponding to the color of the color resist layer (113); when the second pixel unit (P2) is in a dark state, the first color cholesteric liquid crystal molecules (131) in the area corresponding to the second pixel unit (P2) are controlled to be in a reflective state. The ambient light is absorbed by both the color resist layer (113) and the first color dye liquid crystal molecules (132).

9. The driving method of the reflective display device according to claim 8, wherein: The second pixel unit (P2) includes a second color pixel unit (P21), the color resist layer (113) includes a second color resist layer (113a) corresponding to the second color pixel unit (P21), the first color and the second color are complementary colors, and the driving method includes: When the reflective display device (10) displays a first color, all the first pixel units (P1) are controlled to be in a bright state and all the second pixel units (P2) are controlled to be in a dark state; when the reflective display device (10) displays a second color, all the first pixel units (P1) are controlled to be in a dark state and all the second pixel units (P2) are controlled to be in a bright state; when the reflective display device (10) displays white, all the first pixel units (P1) and the second pixel units (P2) are controlled to be in a bright state.

10. The driving method of the reflective display device according to claim 8, wherein: The second pixel unit (P2) includes a second color pixel unit (P21) and a third color pixel unit (P22); the color resist layer (113) includes a second color resist layer (113a) corresponding to the second color pixel unit (P21) and a third color resist layer (113b) corresponding to the third color pixel unit (P22); and the driving method includes: When the reflective display device (10) displays a first color, all the first pixel units (P1) are controlled to be in a bright state and all the second pixel units (P2) are controlled to be in a dark state; when the reflective display device (10) displays a second color, all the first pixel units (P1) and the third color pixel units (P22) are controlled to be in a dark state and all the second color pixel units (P21) are controlled to be in a bright state; when the reflective display device (10) displays a third color, all the first pixel units (P1) and the second color pixel units (P21) are controlled to be in a dark state and all the third color pixel units (P22) are controlled to be in a bright state; when the reflective display device (10) displays white, all the first pixel units (P1) and the second pixel units (P2) are controlled to be in a bright state.

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