Reflective display device and driving method

Abstract

The invention discloses a reflective display device and a driving method. The reflective display device comprises a bistable liquid crystal box and a reflective layer, the bistable liquid crystal box comprises a first opposed substrate, a first array substrate and a bistable liquid crystal layer, bistable liquid crystal molecules of the bistable liquid crystal layer reflect invisible light rays in a reflection plane state, a first transparent pixel electrode is arranged on the first array substrate, a first transparent common electrode is arranged on the first opposed substrate, and a second transparent pixel electrode is arranged on the second opposed substrate. And a color resistance layer is arranged on the first opposite substrate or the first array substrate on one side far away from the external environment. The bistable liquid crystal molecules for reflecting invisible light rays are adopted, the color resistance layer is arranged on the side, away from the external environment, of the substrate, and then the reflecting layer is matched, so that when colors are reflected, the bistable liquid crystal molecules are in a reflecting plane state, the visible light rays are reflected through the reflecting layer, the corresponding colors are displayed after light filtering of the color resistance layer, and color display is achieved; and the light reflectivity is increased, and the display brightness is improved.

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. 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, bistable 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] Figure 1 This is one of the structural diagrams of a reflective display device using a single-layer bistable liquid crystal cell in the prior art, such as Figure 1 As shown, conventional reflective display devices using bistable liquid crystals (LCDs) reflect only one color due to the required pitch of the bistable liquid crystals, while transmitting light of other colors. Consequently, single-layer bistable liquid crystal reflective display devices 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 product applications. Furthermore, the color of light reflected by the bistable liquid crystals is poor, affecting the display quality. Figure 2 FIG. 1 is a schematic diagram of a structure of a reflective display device using a three-layer bistable liquid crystal cell in the prior art. Figure 2 As shown, if white display or color display is required, the reflective display device needs to use a three-layer bistable liquid crystal box to reflect red / green / blue light respectively, thereby achieving white display and color display. However, the three-layer bistable liquid crystal box is not only thicker but also more expensive.

[0005] Figure 3 This is the second structural diagram of a reflective display device using a single-layer bistable liquid crystal cell in the prior art. Figure 3 As shown, in order to solve the problem that a single-cell bistable liquid crystal reflective display device can only reflect one color or that a three-layer bistable liquid crystal cell has a large cell thickness, the prior art also uses a bistable liquid crystal that reflects non-visible light and is combined with RGB color resistors. The ambient light reflected by the fogged (FC) bistable liquid crystal is filtered by the RGB color resistors to achieve RGB three-color display. However, the fogged bistable liquid crystal has a low reflectivity to light, resulting in a low brightness of the bistable liquid crystal display device. Summary of the Invention

[0006] In order to overcome the shortcomings and deficiencies in the prior art, an object of the present invention is to provide a reflective display device and a driving method thereof, so as to solve the problem of low reflectivity of the bistable liquid crystal display device in the prior art.

[0007] The purpose of the present invention is achieved through the following technical solutions: The present invention provides a reflective display device, comprising a bistable liquid crystal cell and a reflective layer provided on a side of the bistable liquid crystal cell away from an external environment; The bistable liquid crystal cell includes a first opposing substrate, a first array substrate disposed opposite to the first opposing substrate, and a bistable liquid crystal layer located between the first opposing substrate and the first array substrate. The bistable liquid crystal layer contains bistable liquid crystal molecules, all of which reflect non-visible light in a reflective planar state. A first transparent pixel electrode is provided on the first array substrate, a first transparent common electrode cooperating with the first transparent pixel electrode is provided on the first opposing substrate, and a color resist layer is provided on the first opposing substrate or the first array substrate facing away from the external environment. In the color state, the bistable liquid crystal molecules are in a reflective planar state; in the white state, the bistable liquid crystal molecules are in a focal conic state.

[0008] Furthermore, the reflective layer is a total reflective layer or a semi-transmissive and semi-reflective layer.

[0009] Furthermore, the reflective layer is a semi-transmissive and semi-reflective layer, and the reflective display device includes a polymer dispersed liquid crystal cell provided on a side of the reflective layer away from the bistable liquid crystal cell; The polymer dispersed liquid crystal cell includes a second opposing substrate, a second array substrate disposed opposite to the second opposing substrate, and a polymer dispersed liquid crystal layer located between the second opposing substrate and the second array substrate, a second transparent pixel electrode being provided on the second array substrate, and a second transparent common electrode being provided between the second opposing substrate and the second transparent pixel electrode; In the color state, the bistable liquid crystal molecules are in a reflective planar state, and the polymer dispersed liquid crystal layer is in a foggy state; in the white state, the bistable liquid crystal molecules are in a focal conic state, and the polymer dispersed liquid crystal layer is in a transparent state.

[0010] Furthermore, the reflective display device has a plurality of pixel units distributed in an array, and each of the pixel units is correspondingly provided with the first transparent pixel electrode and the color resist layer.

[0011] Furthermore, the plurality of pixel units include green pixel units, blue pixel units and red pixel units, the color resist layer includes a green color resist layer, a blue color resist layer and a red color resist layer, the green color resist layer corresponds to the green pixel unit, the blue color resist layer corresponds to the blue pixel unit, and the red color resist layer corresponds to the red pixel unit.

[0012] Furthermore, the plurality of pixel units further include black pixel units, the color resist layer includes a black color resist layer, and the black color resist layer corresponds to the black pixel unit.

[0013] 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: In the color state, a common signal voltage is applied to the first transparent common electrode, and a reflective state voltage is applied to the first transparent pixel electrode to control the bistable liquid crystal molecules to present a reflective planar state; In the white state, a common signal voltage is applied to the first transparent common electrode, and a focal conic voltage is applied to the first transparent pixel electrode to control the bistable liquid crystal molecules to present a focal conic state.

[0014] The present application also provides a reflective display device, comprising a bistable liquid crystal cell and a polymer dispersed liquid crystal cell disposed on a side of the bistable liquid crystal cell away from an external environment; The bistable liquid crystal cell includes a first opposing substrate, a first array substrate disposed opposite to the first opposing substrate, and a bistable liquid crystal layer located between the first opposing substrate and the first array substrate. The bistable liquid crystal layer contains bistable liquid crystal molecules, all of which reflect non-visible light in a reflective planar state. A first transparent pixel electrode is provided on the first array substrate, a first transparent common electrode cooperating with the first transparent pixel electrode is provided on the first opposing substrate, and a color resist layer is provided on the first opposing substrate or the first array substrate on a side closer to the external environment. The polymer dispersed liquid crystal cell includes a second opposing substrate, a second array substrate disposed opposite to the second opposing substrate, and a polymer dispersed liquid crystal layer located between the second opposing substrate and the second array substrate, a second transparent pixel electrode being provided on the second array substrate, and a second transparent common electrode being provided between the second opposing substrate and the second transparent pixel electrode; In the dark state, the bistable liquid crystal molecules are in a reflective planar state, and the polymer dispersed liquid crystal layer is in a transparent state; in the color state, the bistable liquid crystal molecules are in a focal conic state, and the polymer dispersed liquid crystal layer is in a foggy state.

[0015] Furthermore, the reflective display device includes a black light absorbing layer provided on a side of the polymer dispersed liquid crystal cell away from the external environment.

[0016] 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: In a dark state, a common signal voltage is applied to the first transparent common electrode and the second transparent common electrode, a reflective state voltage is applied to the first transparent pixel electrode, and a transparent state voltage is applied to the second transparent pixel electrode, so as to control the bistable liquid crystal molecules to present a reflective planar state and the polymer dispersed liquid crystal layer to present a transparent state; In the color state, a common signal voltage is applied to the first transparent common electrode and the second transparent common electrode, a focal conic voltage is applied to the first transparent pixel electrode, and a fog voltage is applied to the second transparent pixel electrode, so as to control the bistable liquid crystal molecules to present a focal conic state and the polymer dispersed liquid crystal layer to present a fog state.

[0017] The beneficial effects of the present invention are as follows: by using bistable liquid crystal molecules that reflect invisible light, and disposing a color resist layer on the substrate (first opposing substrate or first array substrate) on the side away from the external environment, and then using a reflective layer, when reflecting color, the bistable liquid crystal molecules are in a reflective planar state, and visible light is reflected by the reflective layer. After being filtered by the color resist layer, it displays the corresponding color, thereby achieving color display, increasing the reflectivity of light, and improving display brightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is one of the structural schematic diagrams of a reflective display device using a single-layer bistable liquid crystal cell in the prior art.

[0019] Figure 2 It is a schematic structural diagram of a reflective display device using a three-layer bistable liquid crystal cell in the prior art.

[0020] Figure 3 This is the second structural diagram of a reflective display device using a single-layer bistable liquid crystal cell in the prior art.

[0021] Figure 4 3 is a schematic structural diagram of the reflective display device in the initial state in the first embodiment of the present invention.

[0022] Figure 5 Schematic diagram of the arrangement structure of the color resist on the first opposing substrate in the first embodiment of the present invention.

[0023] Figure 6 It is a schematic diagram of the planar structure of the first array substrate in the first embodiment of the present invention.

[0024] Figure 7 It is a schematic diagram of the principle of state transformation of bistable liquid crystal molecules in the first embodiment of the present invention.

[0025] Figure 8 Schematic diagram of driving signals corresponding to state changes of bistable liquid crystal molecules in the first embodiment of the present invention.

[0026] Figure 9 3 is a schematic structural diagram of the reflective display device in the first embodiment of the present invention when displaying a color image.

[0027] Figure 10 3 is a schematic structural diagram of the reflective display device in the first embodiment of the present invention when displaying a white image.

[0028] Figure 11 3 is a schematic structural diagram of the reflective display device in the initial state in the second embodiment of the present invention.

[0029] Figure 12 Schematic diagram of the arrangement structure of the color resist on the first opposing substrate in the second embodiment of the present invention.

[0030] Figure 13 1 is a curve showing the relationship between wavelength and reflectivity of black resist of different materials in the second embodiment of the present invention.

[0031] Figure 14 3 is a schematic structural diagram of the reflective display device in the second embodiment of the present invention when displaying a color image.

[0032] Figure 15 3 is a schematic structural diagram of the reflective display device in the second embodiment of the present invention when displaying a white image.

[0033] 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.

[0034] Figure 17 It is a schematic diagram of the planar structure of the second array substrate in the third embodiment of the present invention.

[0035] Figure 183 is a schematic structural diagram of the reflective display device in the third embodiment of the present invention when displaying a color image.

[0036] Figure 19 3 is a schematic structural diagram of the reflective display device in the third embodiment of the present invention when displaying a white image.

[0037] Figure 20 3 is a schematic structural diagram of the reflective display device in the initial state in the fourth embodiment of the present invention.

[0038] Figure 21 3 is a schematic structural diagram of the reflective display device in the fourth embodiment of the present invention when displaying a color image.

[0039] Figure 22 3 is a schematic structural diagram of the reflective display device in the fourth embodiment of the present invention when displaying a black image. DETAILED DESCRIPTION

[0040] To further illustrate the technical means and effects of the present invention to achieve the intended purpose, the following detailed description of the specific implementation, structure, features, and effects of the reflective display device and driving method proposed in the present invention is given in conjunction with the accompanying drawings and preferred embodiments. [Example 1] Figure 4 3 is a schematic structural diagram of the reflective display device in the initial state in the first embodiment of the present invention. Figure 5 Schematic diagram of the arrangement structure of the color resist on the first opposing substrate in the first embodiment of the present invention. Figure 6 It is a schematic diagram of the planar structure of the first array substrate in the first embodiment of the present invention.

[0041] like Figures 4 to 6 As shown, a reflective display device provided in a first embodiment of the present invention includes a bistable liquid crystal cell 10 and a reflective layer 20 disposed on the side of the bistable liquid crystal cell 10 facing away from the external environment. Ambient light first enters the reflective display device from one side of the bistable liquid crystal cell 10, is reflected by the reflective layer 20, and then passes through the bistable liquid crystal cell 10 and is emitted. In this embodiment, the reflective layer 20 is a fully reflective layer, for example, made of a metal with a high reflectivity such as silver or aluminum, thereby increasing the reflectivity of light. Of course, the reflective layer 20 can also be a semi-transmissive and semi-reflective layer, such as an APF (Advanced Polarizing Film) film, a DBEF (Dual Brightness Enhancement Film) film, or a metal wire grid polarizer.

[0042] The bistable liquid crystal cell 10 includes a first opposing substrate 11, a first array substrate 12 disposed opposite the first opposing substrate 11, and a bistable liquid crystal layer 13 located between the first opposing substrate 11 and the first array substrate 12. The bistable liquid crystal layer 13 contains bistable liquid crystal molecules 131, all of which reflect non-visible light in the planar reflective state. In this embodiment, the first opposing substrate 11 is disposed on the side of the bistable liquid crystal cell 10 facing the reflective layer 20, that is, the first opposing substrate 11 is disposed on the side of the bistable liquid crystal cell 10 facing away from the external environment. The first array substrate 12 is disposed on the side of the bistable liquid crystal cell 10 facing the external environment. A color resist layer 113 is provided on the side of the first opposing substrate 11 facing away from the external environment. Of course, in other embodiments, the first array substrate 12 may be arranged on the side of the bistable liquid crystal box 10 facing the reflective layer 20, that is, the first array substrate 12 is arranged on the side of the bistable liquid crystal box 10 away from the external environment, and the first opposing substrate 11 is arranged on the side of the bistable liquid crystal box 10 facing the external environment, and the color resist layer 113 is provided on the first array substrate 12 on the side away from the external environment.

[0043] The reflective display device includes a plurality of pixel units P arranged in an array. A first transparent pixel electrode 121 is provided on a first array substrate 12. A first transparent common electrode 111 cooperating with the first transparent pixel electrode 121 is provided on a first opposing substrate 11. A color resist layer 113 is provided in regions corresponding to the pixel units P. Each pixel unit P is provided with a first transparent pixel electrode 121 and a color resist layer 113. The first transparent pixel electrode 121 is a block electrode corresponding one-to-one with each pixel unit P. The first transparent common electrode 111 is a planar electrode covering the entire surface of the first opposing substrate 11. The first transparent pixel electrode 121 and the first transparent common electrode 111 cooperate with each other to control the deflection of bistable liquid crystal molecules 131 in the bistable liquid crystal layer 13, thereby controlling the bistable liquid crystal molecules 131 to assume different states. The first transparent pixel electrode 121 is disposed on a side of the first array substrate 12 closest to the bistable liquid crystal layer 13 , and the first transparent common electrode 111 is disposed on a side of the first opposing substrate 11 closest to the bistable liquid crystal layer 13 to improve the response speed of the bistable liquid crystal layer 13 .

[0044] When the pixel cell P is in the white state, the bistable liquid crystal molecules 131 in the region corresponding to the pixel cell P exhibit a disordered, chaotic arrangement, resulting in a foggy state. By controlling the foggy state of the bistable liquid crystal molecules 131 and reflecting ambient light, the pixel cell P is rendered white. When the pixel cell P is in a color state, the bistable liquid crystal molecules 131 in the region corresponding to the pixel cell P exhibit a regular, periodic spiral arrangement, resulting in a reflective planar state and selective reflection. The bistable liquid crystal molecules 131 reflect invisible light, while visible light in the ambient light passes through the color-resistance layer 113 and is reflected back by the reflective layer 20, displaying the corresponding color. The visible light reflected by the reflective layer 20, filtered by the color-resistance layer 113, displays the corresponding color, achieving color display and increasing light reflectivity, thereby enhancing display brightness.

[0045] Among them, bistable liquid crystal molecules have three stable textures: P state (Planar, planar texture state, reflective planar state), FC state (FocalConic, focal conic state, foggy state), and H state (transparent state). In the P state, the reflection spectrum of the bistable liquid crystal molecules is in the non-visible spectrum range. The bistable liquid crystal molecules reflect non-visible light. The specific reflected light can be set according to the pitch of the bistable liquid crystal molecules. The reflected wavelength satisfies the condition λ = n * P (λ is wavelength, P is pitch, and n is refractive index). In the FC state, the bistable liquid crystal molecules no longer reflect the above-mentioned light, and the light can be scattered and passed through the bistable liquid crystal molecules. In the H state, the bistable liquid crystal molecules also no longer reflect the above-mentioned light, and the light can directly pass through the bistable liquid crystal molecules without having a scattering effect on the light. Under the action of a certain electric field, these three states can be converted into each other. The bistable liquid crystal molecules are, for example, cholesteric liquid crystal molecules.

[0046] Figure 7 It is a schematic diagram of the principle of state transformation of bistable liquid crystal molecules in the first embodiment of the present invention. Figure 8 Schematic diagram of the driving signal corresponding to the state change of the bistable liquid crystal molecules in the first embodiment of the present invention. Figure 7 and Figure 8As shown, a common voltage signal Vcom is applied to the first transparent common electrode 111, and a first electrical signal V1 is continuously applied to the first transparent pixel electrode 121. A first voltage difference (about 20V) is formed between the common voltage signal Vcom and the first electrical signal V1. A strong vertical electric field is formed between the first transparent common electrode 111 and the first transparent pixel electrode 121, and the bistable liquid crystal molecules rotate and stagnate in the H state (transparent state). A common voltage signal Vcom is applied to the first transparent common electrode 111, and a second electrical signal V2 is applied to the first transparent pixel electrode 121. A second voltage difference (e.g., 30V) exists between the second electrical signal V2 and the common voltage signal Vcom, and the second electrical signal V2 directly becomes the same as the common voltage signal Vcom at 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 quickly decreases and becomes the same as the common voltage signal Vcom. Therefore, a strong vertical electric field is first formed between the first transparent common electrode 111 and the first transparent pixel electrode 121, and then the vertical electric field quickly disappears, causing the bistable liquid crystal molecules to first rotate to the H state, and then rotate and stagnate in the P state, which is a reflective planar state. A common voltage signal Vcom is applied to the first transparent common electrode 111, and a third electrical signal V3 is applied to the first transparent pixel electrode 121. A first voltage difference (e.g., 20V) exists between the third electrical signal V3 and the common voltage signal Vcom. The third electrical signal V3 gradually becomes equal to the common voltage signal Vcom within a second preset time. Specifically, the third electrical signal V3 initially has a large voltage difference with the common voltage signal Vcom, then slowly decreases and becomes equal to the common voltage signal Vcom. The first preset time is shorter than the second preset time. Consequently, a strong vertical electric field is first formed between the first transparent common electrode 111 and the first transparent pixel electrode 121, and then the vertical electric field slowly disappears, causing the bistable liquid crystal molecules to first rotate to the H state and then rotate and stagnate in the high-haze FC state, which is a scattering state and has a light-scattering effect. The bistable liquid crystal molecules are arranged in different directions, reflecting different visible light spectra, while transmitting the remaining spectrum. The P and FC states do not require voltage to maintain.

[0047] In this embodiment, the bistable liquid crystal molecules 131 are infrared bistable liquid crystal molecules and reflect infrared light in the planar reflective state. That is, the primary reflection wavelength is above 780 nm. When the refractive index n is 1.6, as calculated by λ = n * p, the corresponding helical pitch is greater than 500 nm. Alternatively, the bistable liquid crystal molecules 131 may be ultraviolet bistable liquid crystal molecules and reflect ultraviolet light in the planar reflective state. That is, the primary reflection wavelength is below 380 nm. When the refractive index n is 1.6, as calculated by λ = n * p, the corresponding helical pitch is less than 250 nm. Consequently, the bistable liquid crystal molecules 131 reflect light invisible to the human eye in the planar reflective state, while visible light is absorbed by both the color resist layer 113 and the black matrix layer 22, achieving a black state effect.

[0048] In this embodiment, the plurality of pixel units P include green pixel units, blue pixel units, and red pixel units. The color resist layer 113 includes a green color resist layer 113a, a blue color resist layer 113b, and a red color resist layer 113c. The green color resist layer 113a corresponds to the green pixel unit, the blue color resist layer 113b corresponds to the blue pixel unit, and the red color resist layer 113c corresponds to the red pixel unit. This allows the reflective display device to display various colors based on the color mixing principle of red / green / blue light, and furthermore, with the multiple grayscale brightness of the pixel unit P, a richer color display can be achieved. Figure 5 As shown, a column of green pixel units, a column of blue pixel units and a column of red pixel units are alternately arranged in sequence along the row direction.

[0049] like Figure 6 As shown, a first array substrate 12 is provided with a plurality of first scan lines 101 and a plurality of first data lines 102. The plurality of first scan lines 101 and the plurality of first data lines 102 are insulated from each other and cross to define a plurality of pixel units P. The first array substrate 12 is provided with a first thin film transistor 103 and a first transparent pixel electrode 121 in each pixel unit P. The first transparent pixel electrode 121 is electrically connected to the first scan line 101 and the first data line 102 adjacent to the first thin film transistor 103 through the first thin film transistor 103. The first thin film transistor 103 includes a first gate, a first active layer, a first drain, and a first source. The first gate and the first scan line 101 are located on the same layer and are electrically connected. The first gate and the first active layer are separated by an insulating layer. The first source is electrically connected to the first data line 102. The first drain is electrically connected to the first transparent pixel electrode 121 through a contact hole.

[0050] Furthermore, a black matrix 112 is provided on the first opposing substrate 11. The black matrix 112 is used to separate the multiple pixel units P from each other. Specifically, the black matrix 112 is used to separate the green color-resistance layer 113a, the blue color-resistance layer 113b, and the red color-resistance layer 113c from each other on the first opposing substrate 11, thereby preventing color mixing between adjacent pixel units P. The projection of the black matrix 112 on the first array substrate 12 corresponds to the first scan line 101, the first data line 102, and the first thin-film transistor 103, thereby providing a light shielding effect for the first scan line 101, the first data line 102, and the first thin-film transistor 103.

[0051] The first counter substrate 11 and the first array substrate 12 can be made of transparent substrates such as glass, acrylic, and polycarbonate. The first transparent common electrode 111 and the first transparent pixel electrode 121 can be made of transparent electrodes such as indium tin oxide (ITO) or indium zinc oxide (IZO).

[0052] 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 comprises: In the color state, a common signal voltage is applied to the first transparent common electrode 111 , and a reflective state voltage is applied to the first transparent pixel electrode 121 to control the bistable liquid crystal molecules 131 to present a reflective planar state. Figure 9 FIG. 1 is a schematic diagram of the structure of the reflective display device in the first embodiment of the present invention when displaying a color image. Figure 8 and Figure 9 As shown, when displaying a color image, a common voltage signal Vcom is applied to the first transparent common electrode 111, and a second electrical signal V2 is applied to the first transparent pixel electrode 121. A second voltage difference (e.g., 30V) exists between the second electrical signal V2 and the common voltage signal Vcom, and the second electrical signal V2 directly becomes the same as the common voltage signal Vcom at a first predetermined time. That is, the second electrical signal V2 first has a large voltage difference with the common voltage signal Vcom, and then quickly decreases and becomes the same as the common voltage signal Vcom. Therefore, a strong vertical electric field is first formed between the first transparent common electrode 111 and the first transparent pixel electrode 121, and then the vertical electric field quickly disappears, causing the bistable liquid crystal molecules to first rotate to the H state and then rotate and stagnate in the P state, which is a reflective planar state. The bistable liquid crystal molecules 131 reflect invisible light, while visible light in the ambient light passes through the color resist layer 113 and is reflected back by the reflective layer 20 to present the corresponding color (e.g., red / green / blue).

[0053] In the white state, a common signal voltage is applied to the first transparent common electrode 111 , and a focal conic voltage is applied to the first transparent pixel electrode 121 to control the bistable liquid crystal molecules 131 to present a focal conic state. Figure 10 Schematic diagram of the structure of the reflective display device in the first embodiment of the present invention when displaying a white image. Figure 8 and Figure 10As shown, when a white screen is displayed, a common voltage signal Vcom is applied to the first transparent common electrode 111, and a third electrical signal V3 is applied to the first transparent pixel electrode 121. A first voltage difference (e.g., 20V) exists between the third electrical signal V3 and the common voltage signal Vcom, and the third electrical signal V3 gradually becomes the same as the common voltage signal Vcom within a second preset time. That is, the third electrical signal V3 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. The first preset time is shorter than the second preset time. Therefore, a strong vertical electric field is first formed between the first transparent common electrode 111 and the first transparent pixel electrode 121, and then the vertical electric field slowly disappears, causing the bistable liquid crystal molecules to first rotate to the H state, and then rotate and stagnate in the high-haze FC state, which is a scattering state and has a light-scattering effect, thereby causing the reflective display device to appear white.

[0054] By controlling different pixel units P to present their respective corresponding color states or white states, the reflective display device can display a color image on a white background.

[0055] [Example 2] Figure 11 3 is a schematic structural diagram of the reflective display device in the initial state in the second embodiment of the present invention. Figure 12 FIG. 1 is a schematic diagram of the arrangement structure of the color resist on the first opposing substrate in the second embodiment of the present invention. Figure 11 and Figure 12 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 4 to 10 ) are basically the same, except that: In this embodiment, the plurality of pixel units P include green pixel units, blue pixel units, red pixel units, and black pixel units. The color resist layer 113 includes a green color resist layer 113a, a blue color resist layer 113b, a red color resist layer 113c, and a black color resist layer 113d. The green color resist layer 113a corresponds to the green pixel unit, the blue color resist layer 113b corresponds to the blue pixel unit, the red color resist layer 113c corresponds to the red pixel unit, and the black color resist layer 113d corresponds to the black pixel unit. Thus, the reflective display device can realize the display of various colors based on the color mixing principle of red / green / blue light, and realize the display of richer colors by combining the multiple grayscale brightness of the pixel unit P. In addition, by combining the black pixel unit, it can realize the display of color and black images. Among them, as Figure 12 As shown, a column of black pixel units, a column of blue pixel units, a column of red pixel units and a column of green pixel units are alternately arranged in the row direction. The black color resist layer 113d can be made of metal chromium (Cr) to improve the reflectivity of the reflective display device.

[0056] The following table shows the relationship between the wavelength and reflectivity of black color resist of different materials.

[0057]

[0058] Figure 13 : is the relationship curve between the wavelength and reflectivity of the black color resist of different materials in the second embodiment of the present invention. Figure 13 As can be seen from the above table, the black color resist layer 113d made of metal chromium (Cr) has a higher reflectivity than the black color resist layer 113d made of conventional resin (Resin), and can also achieve black color.

[0059] 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 comprises: In the color state, a common signal voltage is applied to the first transparent common electrode 111 , and a reflective state voltage is applied to the first transparent pixel electrode 121 to control the bistable liquid crystal molecules 131 to present a reflective planar state. Figure 14 FIG. 1 is a schematic diagram of the structure of the reflective display device in the second embodiment of the present invention when displaying a color image. Figure 8 and Figure 14 As shown, when displaying a color image, a common voltage signal Vcom is applied to the first transparent common electrode 111, and a second electrical signal V2 is applied to the first transparent pixel electrode 121. A second voltage difference (e.g., 30V) exists between the second electrical signal V2 and the common voltage signal Vcom. At a first predetermined time, the second electrical signal V2 directly becomes equal to the common voltage signal Vcom. That is, the second electrical signal V2 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 first transparent common electrode 111 and the first transparent pixel electrode 121, and then the vertical electric field quickly disappears, causing the bistable liquid crystal molecules to first rotate to the H state and then rotate and stabilize in the P state, which is a reflective planar state. The bistable liquid crystal molecules 131 reflect non-visible light. Visible light in the ambient light passes through the color resist layer 113 and is reflected back by the reflective layer 20, presenting the corresponding color (e.g., red / green / blue / black).

[0060] In the white state, a common signal voltage is applied to the first transparent common electrode 111 , and a focal conic voltage is applied to the first transparent pixel electrode 121 to control the bistable liquid crystal molecules 131 to present a focal conic state. Figure 15 FIG. 1 is a schematic diagram of the structure of the reflective display device in the second embodiment of the present invention when displaying a white image. Figure 8 and Figure 15As shown, when a white screen is displayed, a common voltage signal Vcom is applied to the first transparent common electrode 111, and a third electrical signal V3 is applied to the first transparent pixel electrode 121. A first voltage difference (e.g., 20V) exists between the third electrical signal V3 and the common voltage signal Vcom, and the third electrical signal V3 gradually becomes the same as the common voltage signal Vcom within a second preset time. That is, the third electrical signal V3 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. The first preset time is shorter than the second preset time. Therefore, a strong vertical electric field is first formed between the first transparent common electrode 111 and the first transparent pixel electrode 121, and then the vertical electric field slowly disappears, causing the bistable liquid crystal molecules to first rotate to the H state, and then rotate and stagnate in the high-haze FC state, which is a scattering state and has a light-scattering effect, thereby causing the reflective display device to appear white.

[0061] 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.

[0062] [Example 3] 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 FIG. 1 is a schematic diagram of the planar structure of the second array substrate in the third embodiment of the present invention. Figure 16 and Figure 17 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 4 to 10 ), Example 2 ( Figures 11 to 15 ) are basically the same, except that: In this embodiment, the reflective layer 20 is a semi-transmissive and semi-reflective layer, such as an APF (Advanced Polarizing Film) film, a DBEF (Dual Brightness Enhancement Film) film, or a metal wire grid polarizer.

[0063] The reflective display device includes a polymer dispersed liquid crystal cell 30 disposed on a side of the reflective layer 20 away from the bistable liquid crystal cell 10. The polymer dispersed liquid crystal cell 30 includes a second opposing substrate 31, a second array substrate 32 disposed opposite the second opposing substrate 31, and a polymer dispersed liquid crystal layer 33 disposed between the second opposing substrate 31 and the second array substrate 32. A second transparent pixel electrode 321 is disposed on the second array substrate 32, and a second transparent common electrode 311 is disposed between the second opposing substrate 31 and the second transparent pixel electrode 321.

[0064] The second transparent pixel electrode 321 is a block electrode corresponding one-to-one with each pixel unit P, that is, the first transparent pixel electrode 121 corresponds one-to-one with the second transparent pixel electrode 321. The second transparent common electrode 311 is a planar electrode that covers the entire surface of the second opposing substrate 31. The second transparent pixel electrode 321 and the second transparent common electrode 311 are used to control the polymer dispersed liquid crystal layer 33 to switch between a foggy state and a transparent state. When the voltage difference between the second transparent pixel electrode 321 and the second transparent common electrode 311 is less than a first preset value, the polymer dispersed liquid crystal layer 33 is foggy and has a light-scattering effect. When the voltage difference between the second transparent pixel electrode 321 and the second transparent common electrode 311 is greater than a second preset value, the polymer dispersed liquid crystal layer 33 is transparent.

[0065] like Figure 17 As shown, a plurality of second scan lines 301 and a plurality of second data lines 302 are provided on the second array substrate 32. The plurality of second scan lines 301 and the plurality of second data lines 302 are insulated from each other and cross-define a plurality of pixel units P. The second array substrate 32 includes a second thin-film transistor 303 and a second transparent pixel electrode 321 in each pixel unit P. The second transparent pixel electrode 321 is electrically connected to the second scan line 301 and the second data line 302 adjacent to the second thin-film transistor 303 through the second thin-film transistor 303. The second thin-film transistor 303 includes a second gate, a second active layer, a second drain, and a second source. The second gate and the second scan line 301 are located on the same second layer and are electrically connected. The second gate and the second active layer are separated by an insulating layer. The second source is electrically connected to the second data line 302. The second drain is electrically connected to the second transparent pixel electrode 321 through a contact hole.

[0066] 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 comprises: In the color state, a common signal voltage is applied to the first transparent common electrode 111 and the second transparent common electrode 311, a reflective state voltage is applied to the first transparent pixel electrode 121, and a fogging state voltage is applied to the second transparent pixel electrode 321 to control the bistable liquid crystal molecules 131 to present a reflective planar state and the polymer dispersed liquid crystal layer 33 to present a fogging state. Figure 18 FIG. 1 is a schematic diagram of the structure of the reflective display device in the third embodiment of the present invention when displaying a color image. Figure 8 and Figure 18As shown, when displaying a color image, a common voltage signal Vcom is applied to the first transparent common electrode 111, and a second electrical signal V2 is applied to the first transparent pixel electrode 121. A second voltage difference (e.g., 30V) exists between the second electrical signal V2 and the common voltage signal Vcom. At a first predetermined time, the second electrical signal V2 directly becomes equal to the common voltage signal Vcom. That is, the second electrical signal V2 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 first transparent common electrode 111 and the first transparent pixel electrode 121, and then rapidly disappears, causing the bistable liquid crystal molecules to rotate to the H state and then rotate and stagnate in the P state, which is a reflective planar state. The common voltage signal Vcom is applied to both the second transparent pixel electrode 321 and the second transparent common electrode 311, causing the polymer dispersed liquid crystal layer 33 to appear foggy and have a light-scattering effect. The bistable liquid crystal molecules 131 reflect non-visible light. After the visible light in the ambient light passes through the color resist layer 113, part of the light is reflected back by the reflective layer 20. The light that passes through the reflective layer 20 is partially reflected back by the polymer dispersed liquid crystal layer 33 to present the corresponding color (e.g., red / green / blue). A good reflection effect can also be achieved by combining a transflective layer with a foggy polymer dispersed liquid crystal layer 33.

[0067] In the white state, a common signal voltage is applied to the first transparent common electrode 111 and the second transparent common electrode 311, a focal conic state voltage is applied to the first transparent pixel electrode 121, and a transparent state voltage is applied to the second transparent pixel electrode 321, so as to control the bistable liquid crystal molecules 131 to present a focal conic state and the polymer dispersed liquid crystal layer 33 to present a transparent state. Figure 19 Schematic diagram of the structure of the reflective display device in the third embodiment of the present invention when displaying a white image. Figure 8 and Figure 19As shown, when a white screen is displayed, a common voltage signal Vcom is applied to the first transparent common electrode 111, and a third electrical signal V3 is applied to the first transparent pixel electrode 121. A first voltage difference (e.g., 20V) exists between the third electrical signal V3 and the common voltage signal Vcom, and the third electrical signal V3 gradually becomes the same as the common voltage signal Vcom within a second preset time. That is, the third electrical signal V3 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. The first preset time is shorter than the second preset time. Therefore, a strong vertical electric field is first formed between the first transparent common electrode 111 and the first transparent pixel electrode 121, and then the vertical electric field slowly disappears, causing the bistable liquid crystal molecules to first rotate to the H state, and then rotate and stagnate in the high-haze FC state, which is a scattering state and has a light-scattering effect, thereby causing the reflective display device to appear white. A common signal voltage Vcom is applied to the second transparent common electrode 311 , and a transparent state voltage is applied to the second transparent pixel electrode 321 . The voltage difference between the second transparent pixel electrode 321 and the second transparent common electrode 311 is, for example, 7V-15V, to control the polymer dispersed liquid crystal layer 33 to be in a transparent state.

[0068] 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.

[0069] [Example 4] Figure 20 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 20 As shown, the reflective display device and driving method provided by the fourth embodiment of the present invention are similar to those provided by the first embodiment ( Figures 4 to 10 ) are basically the same, except that: The reflective display device includes a bistable liquid crystal cell 10 and a polymer-dispersed liquid crystal cell 30 disposed on the side of the bistable liquid crystal cell 10 facing away from the external environment. Ambient light first enters the reflective display device from the side of the bistable liquid crystal cell 10, is reflected by the mist-state polymer-dispersed liquid crystal cell 30, and then passes through the bistable liquid crystal cell 10 and exits. This eliminates the need for a reflective layer 20 and allows a black state to be achieved. Optionally, the reflective display device includes a black light-absorbing layer 40 disposed on the side of the polymer-dispersed liquid crystal cell 30 facing away from the external environment to enhance the black state effect.

[0070] The bistable liquid crystal cell 10 includes a first counter substrate 11, a first array substrate 12 disposed opposite the first counter substrate 11, and a bistable liquid crystal layer 13 located between the first counter substrate 11 and the first array substrate 12. The bistable liquid crystal layer 13 contains bistable liquid crystal molecules 131. All bistable liquid crystal molecules 131 reflect non-visible light when in a planar reflective state. In this embodiment, the first array substrate 12 is disposed on the side of the bistable liquid crystal cell 10 facing the reflective layer 20, that is, the first array substrate 12 is disposed on the side of the bistable liquid crystal cell 10 facing away from the external environment. The first counter substrate 11 is disposed on the side of the bistable liquid crystal cell 10 facing the external environment. A color resist layer 113 is provided on the first counter substrate 11 on the side facing the external environment. Of course, in other embodiments, the first counter substrate 11 may be disposed on the side of the bistable liquid crystal cell 10 facing the reflective layer 20, that is, the first counter substrate 11 is disposed on the side of the bistable liquid crystal cell 10 facing away from the external environment, and the first array substrate 12 is disposed on the side of the bistable liquid crystal cell 10 facing the external environment, with the color resist layer 113 being disposed on the first array substrate 12 on the side facing the external environment. In this way, light is filtered by the color resist layer 113 before entering the bistable liquid crystal layer 13.

[0071] The reflective display device includes a plurality of pixel units P arranged in an array. A first transparent pixel electrode 121 is provided on a first array substrate 12. A first transparent common electrode 111 cooperating with the first transparent pixel electrode 121 is provided on a first opposing substrate 11. A color resist layer 113 is provided in regions corresponding to the pixel units P. Each pixel unit P is provided with a first transparent pixel electrode 121 and a color resist layer 113. The first transparent pixel electrode 121 is a block electrode corresponding one-to-one with each pixel unit P. The first transparent common electrode 111 is a planar electrode covering the entire surface of the first opposing substrate 11. The first transparent pixel electrode 121 and the first transparent common electrode 111 cooperate with each other to control the deflection of bistable liquid crystal molecules 131 in the bistable liquid crystal layer 13, thereby controlling the bistable liquid crystal molecules 131 to assume different states. The first transparent pixel electrode 121 is disposed on a side of the first array substrate 12 closest to the bistable liquid crystal layer 13 , and the first transparent common electrode 111 is disposed on a side of the first opposing substrate 11 closest to the bistable liquid crystal layer 13 to improve the response speed of the bistable liquid crystal layer 13 .

[0072] In this embodiment, the bistable liquid crystal molecules 131 are infrared bistable liquid crystal molecules and reflect infrared light in the planar reflective state. That is, the primary reflection wavelength is above 800 nm. When the refractive index n is 1.6, as calculated by λ = n * p, the corresponding helical pitch is greater than 500 nm. Alternatively, the bistable liquid crystal molecules 131 may be ultraviolet bistable liquid crystal molecules and reflect ultraviolet light in the planar reflective state. That is, the primary reflection wavelength is below 400 nm. When the refractive index n is 1.6, as calculated by λ = n * p, the corresponding helical pitch is less than 250 nm. Consequently, the bistable liquid crystal molecules 131 reflect light invisible to the human eye in the planar reflective state, while visible light is absorbed by both the color resist layer 113 and the black matrix layer 22, achieving a black state effect.

[0073] In this embodiment, the plurality of pixel units P include green pixel units, blue pixel units, and red pixel units. The color resist layer 113 includes a green color resist layer 113a, a blue color resist layer 113b, and a red color resist layer 113c. The green color resist layer 113a corresponds to the green pixel unit, the blue color resist layer 113b corresponds to the blue pixel unit, and the red color resist layer 113c corresponds to the red pixel unit. This allows the reflective display device to display various colors based on the color mixing principle of red / green / blue light, and furthermore, with the multiple grayscale brightness of the pixel unit P, a richer color display can be achieved. Figure 5 As shown, a column of green pixel units, a column of blue pixel units and a column of red pixel units are alternately arranged in sequence along the row direction.

[0074] like Figure 6 As shown, a first array substrate 12 is provided with a plurality of first scan lines 101 and a plurality of first data lines 102. The plurality of first scan lines 101 and the plurality of first data lines 102 are insulated from each other and cross to define a plurality of pixel units P. The first array substrate 12 is provided with a first thin film transistor 103 and a first transparent pixel electrode 121 in each pixel unit P. The first transparent pixel electrode 121 is electrically connected to the first scan line 101 and the first data line 102 adjacent to the first thin film transistor 103 through the first thin film transistor 103. The first thin film transistor 103 includes a first gate, a first active layer, a first drain, and a first source. The first gate and the first scan line 101 are located on the same layer and are electrically connected. The first gate and the first active layer are separated by an insulating layer. The first source is electrically connected to the first data line 102. The first drain is electrically connected to the first transparent pixel electrode 121 through a contact hole.

[0075] Furthermore, a black matrix 112 is provided on the first opposing substrate 11. The black matrix 112 is used to separate the multiple pixel units P from each other. Specifically, the black matrix 112 is used to separate the green color-resistance layer 113a, the blue color-resistance layer 113b, and the red color-resistance layer 113c from each other on the first opposing substrate 11, thereby preventing color mixing between adjacent pixel units P. The projection of the black matrix 112 on the first array substrate 12 corresponds to the first scan line 101, the first data line 102, and the first thin-film transistor 103, thereby providing a light shielding effect for the first scan line 101, the first data line 102, and the first thin-film transistor 103.

[0076] The polymer dispersed liquid crystal box 30 includes a second opposing substrate 31, a second array substrate 32 arranged opposite to the second opposing substrate 31, and a polymer dispersed liquid crystal layer 33 located between the second opposing substrate 31 and the second array substrate 32. A second transparent pixel electrode 321 is provided on the second array substrate 32, and a second transparent common electrode 311 is provided to cooperate with the second opposing substrate 31 and the second transparent pixel electrode 321.

[0077] The second transparent pixel electrode 321 is a block electrode corresponding one-to-one with each pixel unit P, that is, the first transparent pixel electrode 121 corresponds one-to-one with the second transparent pixel electrode 321. The second transparent common electrode 311 is a planar electrode that covers the entire surface of the second opposing substrate 31. The second transparent pixel electrode 321 and the second transparent common electrode 311 are used to control the polymer dispersed liquid crystal layer 33 to switch between a foggy state and a transparent state. When the voltage difference between the second transparent pixel electrode 321 and the second transparent common electrode 311 is less than a first preset value, the polymer dispersed liquid crystal layer 33 is foggy and has a light-scattering effect. When the voltage difference between the second transparent pixel electrode 321 and the second transparent common electrode 311 is greater than a second preset value, the polymer dispersed liquid crystal layer 33 is transparent.

[0078] refer to Figure 18As shown, a plurality of second scan lines 301 and a plurality of second data lines 302 are provided on the second array substrate 32. The plurality of second scan lines 301 and the plurality of second data lines 302 are insulated from each other and cross-define a plurality of pixel units P. The second array substrate 32 includes a second thin-film transistor 303 and a second transparent pixel electrode 321 in each pixel unit P. The second transparent pixel electrode 321 is electrically connected to the second scan line 301 and the second data line 302 adjacent to the second thin-film transistor 303 through the second thin-film transistor 303. The second thin-film transistor 303 includes a second gate, a second active layer, a second drain, and a second source. The second gate and the second scan line 301 are located on the same second layer and are electrically connected. The second gate and the second active layer are separated by an insulating layer. The second source is electrically connected to the second data line 302. The second drain is electrically connected to the second transparent pixel electrode 321 through a contact hole.

[0079] 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 comprises: In the color state, a common signal voltage is applied to the first transparent common electrode 111 and the second transparent common electrode 311, a focal conic voltage is applied to the first transparent pixel electrode 121, and a fog voltage is applied to the second transparent pixel electrode 321, so as to control the bistable liquid crystal molecules 131 to present a focal conic state and the polymer dispersed liquid crystal layer 33 to present a fog state. Figure 21 FIG. 1 is a schematic diagram of the structure of the reflective display device in the fourth embodiment of the present invention when displaying a color image. Figure 8 and Figure 21As shown, in a color image, a common voltage signal Vcom is applied to the first transparent common electrode 111, and a third electrical signal V3 is applied to the first transparent pixel electrode 121. A first voltage difference (e.g., 20V) exists between the third electrical signal V3 and the common voltage signal Vcom. Within a second preset time, the third electrical signal V3 gradually becomes equal to the common voltage signal Vcom. Specifically, the third electrical signal V3 initially has a large voltage difference from the common voltage signal Vcom, then slowly decreases and becomes equal to the common voltage signal Vcom. The first preset time is shorter than the second preset time. Consequently, a strong vertical electric field is first formed between the first transparent common electrode 111 and the first transparent pixel electrode 121, and then the vertical electric field slowly disappears, causing the bistable liquid crystal molecules to first rotate to the H state and then rotate and stagnate in the high-haze FC state, which is a scattering state and has a light-scattering effect. The common voltage signal Vcom is applied to both the second transparent pixel electrode 321 and the second transparent common electrode 311, causing the polymer dispersed liquid crystal layer 33 to be hazy and have a light-scattering effect. After visible light in the ambient light passes through the color resist layer 113, part of the light is reflected back by the bistable liquid crystal layer 13. The light that passes through the bistable liquid crystal layer 13 is partially reflected back by the polymer dispersed liquid crystal layer 33 to present the corresponding color (e.g., red / green / blue). A good reflection effect can also be achieved by combining the foggy bistable liquid crystal layer 13 with the foggy polymer dispersed liquid crystal layer 33.

[0080] In the dark state, a common signal voltage is applied to the first transparent common electrode 111 and the second transparent common electrode 311, a reflective state voltage is applied to the first transparent pixel electrode 121, and a transparent state voltage is applied to the second transparent pixel electrode 321 to control the bistable liquid crystal molecules 131 to present a reflective planar state and the polymer dispersed liquid crystal layer 33 to present a transparent state. Figure 22 FIG. 1 is a schematic diagram of the structure of the reflective display device in the fourth embodiment of the present invention when displaying a black image. Figure 8 and Figure 22As shown, in the dark state, a common voltage signal Vcom is applied to the first transparent common electrode 111, and a second electrical signal V2 is applied to the first transparent pixel electrode 121. A second voltage difference (e.g., 30V) exists between the second electrical signal V2 and the common voltage signal Vcom. At a first predetermined time, the second electrical signal V2 directly becomes equal to the common voltage signal Vcom. That is, the second electrical signal V2 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 first transparent common electrode 111 and the first transparent pixel electrode 121, and then the vertical electric field quickly disappears, causing the bistable liquid crystal molecules to first rotate to the H state and then rotate and stagnate in the P state, which is a reflective planar state. Meanwhile, a common signal voltage Vcom is applied to the second transparent common electrode 311, and a transparent state voltage is applied to the second transparent pixel electrode 321. The voltage difference between the second transparent pixel electrode 321 and the second transparent common electrode 311 is, for example, 7V-15V, to control the polymer dispersed liquid crystal layer 33 to exhibit a transparent state. The bistable liquid crystal molecules 131 reflect invisible light, and the visible light in the ambient light passes through the color resist layer 113 , the bistable liquid crystal layer 13 and the polymer dispersed liquid crystal layer 33 in sequence and is absorbed by the black light absorbing layer 40 to present a black state.

[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 embodiment and will not be described in detail here.

[0082] 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.

[0083] 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: It comprises a bistable liquid crystal box (10) and a reflective layer (20) provided on a side of the bistable liquid crystal box (10) away from the external environment; The bistable liquid crystal box (10) comprises a first opposing substrate (11), a first array substrate (12) arranged opposite to the first opposing substrate (11), and a bistable liquid crystal layer (13) located between the first opposing substrate (11) and the first array substrate (12); the bistable liquid crystal layer (13) comprises bistable liquid crystal molecules (131); all the bistable liquid crystal molecules (131) reflect non-visible light in a reflective plane state; a first transparent pixel electrode (121) is provided on the first array substrate (12); a first transparent common electrode (111) matched with the first transparent pixel electrode (121) is provided on the first opposing substrate (11); and a color resist layer (113) is provided on the first opposing substrate (11) or the first array substrate (12) on a side away from an external environment; In the color state, the bistable liquid crystal molecules (131) are in a reflective planar state; in the white state, the bistable liquid crystal molecules (131) are in a focal conic state.

2. The reflective display device according to claim 1, wherein: The reflective layer (20) is a total reflective layer or a semi-transmissive semi-reflective layer.

3. The reflective display device according to claim 2, wherein: The reflective layer (20) is a semi-transmissive and semi-reflective layer, and the reflective display device comprises a polymer dispersed liquid crystal cell (30) arranged on a side of the reflective layer (20) away from the bistable liquid crystal cell (10); The polymer dispersed liquid crystal box (30) comprises a second opposing substrate (31), a second array substrate (32) arranged opposite to the second opposing substrate (31), and a polymer dispersed liquid crystal layer (33) located between the second opposing substrate (31) and the second array substrate (32); a second transparent pixel electrode (321) is provided on the second array substrate (32); and a second transparent common electrode (311) is provided that cooperates with the second opposing substrate (31) and the second transparent pixel electrode (321); In the color state, the bistable liquid crystal molecules (131) are in a reflective plane state, and the polymer dispersed liquid crystal layer (33) is in a foggy state; in the white state, the bistable liquid crystal molecules (131) are in a focal conic state, and the polymer dispersed liquid crystal layer (33) is in a transparent state.

4. The reflective display device according to claim 1, wherein: The reflective display device comprises a plurality of pixel units (P) distributed in an array, and each of the pixel units (P) is correspondingly provided with the first transparent pixel electrode (121) and the color resist layer (113).

5. The reflective display device according to claim 4, wherein: The plurality of pixel units (P) include green pixel units, blue pixel units, and red pixel units; the color resist layer (113) includes a green color resist layer (113a), a blue color resist layer (113b), and a red color resist layer (113c); the green color resist layer (113a) corresponds to the green pixel unit, the blue color resist layer (113b) corresponds to the blue pixel unit, and the red color resist layer (113c) corresponds to the red pixel unit.

6. The reflective display device according to claim 6, wherein: The plurality of pixel units (P) further include black pixel units, and the color resist layer (113) includes a black color resist layer (113d), and the black color resist layer (113d) corresponds to the black pixel unit.

7. A driving method for a reflective display device, characterized in that: Used to drive the reflective display device according to any one of claims 1 to 6, the driving method comprising: In a color state, a common signal voltage is applied to the first transparent common electrode (111), and a reflection state voltage is applied to the first transparent pixel electrode (121) to control the bistable liquid crystal molecules (131) to present a reflection plane state; In the white state, a common signal voltage is applied to the first transparent common electrode (111), and a focal-conic voltage is applied to the first transparent pixel electrode (121), so as to control the bistable liquid crystal molecules (131) to present a focal-conic state.

8. A reflective display device, characterized in that: It comprises a bistable liquid crystal cell (10) and a polymer dispersed liquid crystal cell (30) arranged on a side of the bistable liquid crystal cell (10) away from the external environment; The bistable liquid crystal box (10) comprises a first opposing substrate (11), a first array substrate (12) arranged opposite to the first opposing substrate (11), and a bistable liquid crystal layer (13) located between the first opposing substrate (11) and the first array substrate (12); the bistable liquid crystal layer (13) comprises bistable liquid crystal molecules (131); all the bistable liquid crystal molecules (131) reflect non-visible light in a reflective plane state; a first transparent pixel electrode (121) is provided on the first array substrate (12); a first transparent common electrode (111) matched with the first transparent pixel electrode (121) is provided on the first opposing substrate (11); and a color resist layer (113) is provided on the first opposing substrate (11) or the first array substrate (12) on the side close to the external environment; The polymer dispersed liquid crystal box (30) comprises a second opposing substrate (31), a second array substrate (32) arranged opposite to the second opposing substrate (31), and a polymer dispersed liquid crystal layer (33) located between the second opposing substrate (31) and the second array substrate (32); a second transparent pixel electrode (321) is provided on the second array substrate (32); and a second transparent common electrode (311) is provided that cooperates with the second opposing substrate (31) and the second transparent pixel electrode (321); In a dark state, the bistable liquid crystal molecules (131) are in a reflective plane state, and the polymer dispersed liquid crystal layer (33) is in a transparent state; in a colored state, the bistable liquid crystal molecules (131) are in a focal conic state, and the polymer dispersed liquid crystal layer (33) is in a foggy state.

9. The reflective display device according to claim 8, wherein: The reflective display device comprises a black light absorbing layer (40) arranged on a side of the polymer dispersed liquid crystal box (30) away from the external environment.

10. A driving method for a reflective display device, characterized in that: For driving the reflective display device according to claim 8 or 9, the driving method comprises: In a dark state, a common signal voltage is applied to the first transparent common electrode (111) and the second transparent common electrode (311), a reflective state voltage is applied to the first transparent pixel electrode (121), and a transparent state voltage is applied to the second transparent pixel electrode (321), so as to control the bistable liquid crystal molecules (131) to present a reflective plane state and the polymer dispersed liquid crystal layer (33) to present a transparent state; In the color state, a common signal voltage is applied to the first transparent common electrode (111) and the second transparent common electrode (311), a focal conic voltage is applied to the first transparent pixel electrode (121), and a fog voltage is applied to the second transparent pixel electrode (321), so as to control the bistable liquid crystal molecules (131) to present a focal conic state and the polymer dispersed liquid crystal layer (33) to present a fog state.

Images