Reflective display device and driving method

Abstract

The invention discloses a reflective display device and a driving method, the reflective display device comprises an opposed substrate, an array substrate and a liquid crystal layer, the liquid crystal layer comprises first color cholesterol liquid crystal molecules, a pixel electrode is arranged on the array substrate, and a common electrode matched with the pixel electrode is arranged on the opposed substrate; the reflective display device is provided with a plurality of pixel units which are distributed in an array mode, a pixel electrode is correspondingly arranged in each pixel unit, each pixel unit comprises a first sub-pixel area and a second sub-pixel area which are different in area, and each pixel electrode comprises a first sub-pixel electrode and a second sub-pixel electrode which are independently controlled. The first sub-pixel electrode corresponds to the first sub-pixel area, and the second sub-pixel electrode corresponds to the second sub-pixel area. The brightness and darkness states of the first sub-pixel area and the second sub-pixel area in each pixel unit are independently controlled, so that the pixel units can present more gray scale display, and the gray scale number of the cholesteric liquid crystal reflective display device is increased.

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 are thin, durable, and energy-saving and environmentally friendly with low power consumption, but they need to be used with a backlight, resulting in thick modules and high costs. Electronic paper displays (reflective displays) have become a type of display that meets the needs of the public. Electronic paper displays can use external light sources to display images, unlike LCD displays that require backlights. Therefore, in outdoor environments with strong sunlight, the information on the electronic paper can still be clearly seen without viewing angle issues. In addition, electronic paper displays are now widely used in electronic readers (such as e-books, e-newspapers) or other electronic components (such as price tags) due to their advantages such as power saving, high reflectivity and contrast ratio.

[0003] Existing electronic paper displays usually use E-Ink microcapsule technology (microcapsule electronic ink technology), SiPix microcup technology (microcup electrophoretic display technology), Bridgestone electronic liquid powder technology, cholesterol liquid crystal display (CLCD) technology, micro-electromechanical system (MEMS) technology or electrowetting technology. However, compared with liquid crystal display technology, existing electronic paper display technology is not very mature, mass production efficiency is low, manufacturing cost is relatively high, and existing electronic paper displays cannot achieve color display.

[0004] In the prior art, the reflective display device using cholesterol liquid crystal can only reflect one color and transmit light of other colors due to the requirement of cholesterol liquid crystal pitch. Therefore, the reflective display device of single-layer cholesterol liquid crystal mostly displays in the form of black text on yellow background, yellow text on black background, red text on black background, or black text on red background, and cannot realize the display of white text on black background or black text on white background like books, which is greatly limited in product application; and the color of light reflected by cholesterol liquid crystal is poor, which affects the display effect. Figure 1 Schematic diagram of the structure of a reflective display device using a three-layer cholesterol liquid crystal cell in the prior art. Figure 1As shown, if white display or color display is required, the reflective display device needs to use a three-layer cholesterol liquid crystal box to reflect red / green / blue light respectively, so as to realize white display and color display. However, the three-layer cholesterol liquid crystal box is not only thicker, but also more expensive. In addition, since cholesterol liquid crystal can only switch between three states: P state (Planar, planar texture state, reflective state), FC state (Focal Conic, focal conic state, fog state) and H state (transparent state), the characteristics of cholesterol liquid crystal are not ordinary liquid crystal curves in the middle tone part, resulting in the reflective display device using cholesterol liquid crystal can only have two grayscales: black state and bright state, so grayscale display is a big challenge. Summary of the invention

[0005] 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 to solve the problem of a small number of grayscales in the reflective display device using cholesteric liquid crystal in the prior art.

[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 arranged opposite to the opposing substrate, and a liquid crystal layer located between the opposing substrate and the array substrate, wherein the liquid crystal layer comprises cholesterol liquid crystal molecules of a first color, wherein the cholesterol liquid crystal molecules of the first color reflect light of a first color in a reflective state, a pixel electrode is arranged on the array substrate, and a common electrode matched with the pixel electrode is arranged on the opposing substrate;

[0008] The reflective display device has a plurality of pixel units distributed in an array, each of the pixel units is provided with a corresponding pixel electrode, the pixel unit includes a first sub-pixel area and a second sub-pixel area with different areas, the pixel electrode includes a first sub-pixel electrode and a second sub-pixel electrode that are independently controlled from each other, the first sub-pixel electrode corresponds to the first sub-pixel area, and the second sub-pixel electrode corresponds to the second sub-pixel area.

[0009] Further, the array substrate is provided with a plurality of scan lines, a plurality of data lines, a plurality of first thin film transistors and a plurality of second thin film transistors, the plurality of scan lines include a first scan line and a second scan line, the upper side of each row of pixel units is correspondingly provided with the first scan line, the lower side of each row of pixel units is correspondingly provided with the second scan line, and the first scan line and the second scan line are provided between any two rows of pixel units;

[0010] In each of the pixel units, the first sub-pixel electrode is conductively connected to the corresponding first scan line and the data line through the first thin film transistor, and the second sub-pixel electrode is conductively connected to the corresponding second scan line and the data line through the second thin film transistor.

[0011] Furthermore, the first sub-pixel electrode and the second sub-pixel electrode in each of the pixel units are connected to the same data line; or the first sub-pixel electrode and the second sub-pixel electrode in each of the pixel units are respectively connected to two different data lines.

[0012] Furthermore, a gate driving circuit is provided on the array substrate, and the gate driving circuit includes multiple main scanning lines, a first control line, a second control line, multiple third thin film transistors and multiple fourth thin film transistors. The first scanning line is conductively connected to the first control line and the corresponding main scanning line through the third thin film transistor, and the second scanning line is conductively connected to the second control line and the corresponding main scanning line through the fourth thin film transistor. The third thin film transistors controlling the first scanning line and the fourth thin film transistors controlling the second scanning line on the upper and lower sides of the pixel units in the same row are connected to the same main scanning line.

[0013] Further, the array substrate is provided with a plurality of scan lines, a plurality of data lines, a plurality of first thin film transistors and a plurality of second thin film transistors, the plurality of data lines include a first data line and a second data line, the left side of each column of the pixel units is correspondingly provided with the first data line, the right side of each column of the pixel units is correspondingly provided with the second data line, and the first data line and the second data line are provided between any two columns of the pixel units;

[0014] In each of the pixel units, the first sub-pixel electrode is conductively connected to the corresponding scan line and the first data line through the first thin film transistor, and the second sub-pixel electrode is conductively connected to the corresponding scan line and the second data line through the second thin film transistor.

[0015] Furthermore, the liquid crystal layer further includes first color dye liquid crystal molecules that are mixed with the first color cholesterol liquid crystal molecules, and the first color dye liquid crystal molecules rotate synchronously with the first color cholesterol liquid crystal molecules;

[0016] The plurality of pixel units include a first pixel unit and a second pixel unit, the opposing substrate is transparent in a region corresponding to the first pixel unit, the opposing substrate is provided with a color resist layer in a region corresponding to the second pixel unit, and the array substrate is provided with a reflective layer in a region corresponding to the second pixel unit;

[0017] When the first pixel unit is in a bright state, the first color cholesterol liquid crystal molecules in the corresponding area of ​​the first pixel unit are all in a reflective state, and when the first pixel unit is in a dark state, the first color cholesterol liquid crystal molecules in the corresponding area of ​​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 cholesterol liquid crystal molecules in the corresponding area of ​​the second pixel unit are all in a transparent state or a foggy state, and when the second pixel unit is in a dark state, the first color cholesterol liquid crystal molecules in the corresponding area of ​​the second pixel unit are all in a reflective state.

[0018] Further, 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, wherein the first color and the second color are complementary colors;

[0019] Alternatively, 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 first color, the second color and the third color are each one of red, green and blue.

[0020] 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;

[0021] Alternatively, a light absorbing layer is provided on the array substrate, the light absorbing layer is used to absorb light passing through the liquid crystal layer, the projection of the light absorbing layer on the array substrate overlaps with the first pixel unit, or the light absorbing layer is a planar structure that covers the entire surface of the array substrate;

[0022] Alternatively, 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.

[0023] The present application also provides a driving method of a reflective display device, which is used to drive the reflective display device as described above, and the driving method includes:

[0024] When the pixel unit is in a dark state, controlling the first sub-pixel region and the second sub-pixel region to be in a dark state;

[0025] When the pixel unit is at a first grayscale brightness, the first sub-pixel region is controlled to be in a bright state, and the second sub-pixel region is controlled to be in a dark state;

[0026] When the pixel unit is at a second grayscale brightness, the first sub-pixel region is controlled to be in a dark state, and the second sub-pixel region is controlled to be in a bright state;

[0027] When the pixel unit is at a third grayscale brightness, the first sub-pixel region and the second sub-pixel region are controlled to be in a bright state.

[0028] Furthermore, the array substrate is provided with a plurality of scan lines, a plurality of data lines, a plurality of first thin film transistors and a plurality of second thin film transistors, the plurality of scan lines include a first scan line and a second scan line, the upper side of each row of pixel units is correspondingly provided with the first scan line, the lower side of each row of pixel units is correspondingly provided with the second scan line, and the first scan line and the second scan line are provided between any two rows of pixel units; in each of the pixel units, the first sub-pixel electrode is conductively connected to the corresponding first scan line and the data line through the first thin film transistor, and the second sub-pixel electrode is conductively connected to the corresponding first scan line and the data line through the second thin film transistor. The first scan line is conductively connected to the data line; a gate driving circuit is provided on the array substrate, and the gate driving circuit includes a plurality of main scan lines, a first control line, a second control line, a plurality of third thin film transistors and a plurality of fourth thin film transistors; the first scan line is conductively connected to the first control line and the corresponding main scan line through the third thin film transistor; the second scan line is conductively connected to the second control line and the corresponding main scan line through the fourth thin film transistor; the third thin film transistors controlling the first scan line and the fourth thin film transistors controlling the second scan line on the upper and lower sides of the pixel units in the same row are connected to the same main scan line;

[0029] The driving method comprises:

[0030] The first control line and the second control line control the third thin film transistor and the fourth thin film transistor to be turned on or off alternately;

[0031] Alternatively, in the Nth frame, the first control line controls the third thin film transistor to turn on, and the second control line controls the fourth thin film transistor to turn off; in the N+1th frame, the first control line controls the third thin film transistor to turn off, and the second control line controls the fourth thin film transistor to turn on, where N is an integer greater than or equal to 1.

[0032] The beneficial effect of the present invention is that the pixel unit includes a first sub-pixel area and a second sub-pixel area with different areas, and the first sub-pixel area and the second sub-pixel area are respectively controlled by the first sub-pixel electrode and the second sub-pixel electrode. The light and dark states of the first sub-pixel area and the second sub-pixel area are then combined with each other, so that the pixel unit can present more grayscale displays, thereby increasing the number of grayscales of the reflective display device of the cholesterol liquid crystal. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the structure of a reflective display device using a three-layer cholesteric liquid crystal cell in the prior art.

[0034] Figure 2 1 is a schematic structural diagram of the reflective display device in the initial state in the first embodiment of the present invention.

[0035] Figure 3 Schematic diagram of the pixel arrangement structure of the reflective display device in the dark state in the first embodiment of the present invention.

[0036] Figure 4 It is a schematic diagram of the planar structure of the array substrate in the first embodiment of the present invention.

[0037] Figure 5 It is a schematic diagram of the principle of the three-state transformation of cholesterol liquid crystal in Example 1 of the present invention.

[0038] Figure 6 It is a schematic diagram of the driving signal for the three-state transformation of the cholesterol liquid crystal in the first embodiment of the present invention.

[0039] Figure 7 1 is a schematic diagram of the pixel arrangement structure of the reflective display device in the first embodiment of the present invention when it is in the first grayscale brightness state.

[0040] Figure 8 Schematic diagram of the pixel arrangement structure of the reflective display device in the second grayscale brightness state in the first embodiment of the present invention.

[0041] Fig. 9 Schematic diagram of the pixel arrangement structure of the reflective display device in the first embodiment of the present invention in the third grayscale brightness state.

[0042] Fig.10 It is a schematic structural diagram of the reflective display device in the first embodiment of the present invention when displaying a pure blue picture.

[0043] Fig.11 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 red picture.

[0044] Fig.12This is the second structural schematic diagram of the reflective display device in the first embodiment of the present invention when displaying a pure red image.

[0045] Fig.13 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 picture.

[0046] Fig.14 This is the second structural schematic diagram of the reflective display device in the first embodiment of the present invention when displaying a pure green picture.

[0047] Fig.15 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 picture.

[0048] Fig.16 This is the second structural schematic diagram of the reflective display device in the first embodiment of the present invention when displaying a white picture.

[0049] Fig.17 It is a schematic diagram of the structure of the reflective display device in the first embodiment of the present invention when displaying a pure black picture.

[0050] Fig.18 This is one of the planar structural schematic diagrams of the array substrate in the second embodiment of the present invention.

[0051] Fig.19 This is the second schematic diagram of the planar structure of the array substrate in the second embodiment of the present invention.

[0052] Fig. 20 It is a schematic diagram of the planar structure of the gate driving circuit in the third embodiment of the present invention.

[0053] Fig.21 Schematic diagram of the waveform of the first gate driving signal in the third embodiment of the present invention.

[0054] Fig. 22 This is one of the waveform diagrams of the second gate driving signal in the third embodiment of the present invention.

[0055] Fig.23 This is the second waveform diagram of the second gate driving signal in the third embodiment of the present invention.

[0056] Fig.24 It is a schematic structural diagram of the reflective display device in the initial state in the fourth embodiment of the present invention.

[0057] Fig.25 It is a schematic structural diagram of the reflective display device in the initial state in the fifth embodiment of the present invention.

[0058] Fig.26 It is a schematic diagram of the pixel arrangement structure of the reflective display device in the fifth embodiment of the present invention.

[0059] Fig. 27 It is a schematic diagram of the planar structure of the array substrate in the fifth embodiment of the present invention.

[0060] Fig.28 It is a schematic structural diagram of the reflective display device in the initial state in the sixth embodiment of the present invention. DETAILED DESCRIPTION

[0061] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the reflective display device and driving method proposed by the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments:

[0062] [Example 1]

[0063] Figure 2 1 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.

[0064] like Figures 2 to 4 As shown, a reflective display device 10 provided in Embodiment 1 of the present invention includes 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 includes first color cholesterol liquid crystal molecules 131, and the first color cholesterol liquid crystal molecules 131 reflect first color light in a reflective state.

[0065] The reflective display device 10 has a plurality of pixel units P distributed in an array, and a pixel electrode 121 is correspondingly arranged in each pixel unit P, and the pixel electrode 121 corresponds to the pixel unit P one by one, and the pixel electrode 121 is a block electrode. A common electrode 111 matching the pixel electrode 121 is arranged on the opposing substrate 11, and the common electrode 111 is a planar electrode covering the entire surface of the opposing substrate 11. Among them, the pixel unit P includes a first sub-pixel area Pa and a second sub-pixel area Pb with different areas, and the pixel electrode 121 includes a first sub-pixel electrode 121a and a second sub-pixel electrode 121b that are independently controlled from each other, and the first sub-pixel electrode 121a corresponds to the first sub-pixel area Pa, and the second sub-pixel electrode 121b corresponds to the second sub-pixel area Pb, that is, the first sub-pixel electrode 121a is a block electrode corresponding to the first sub-pixel area Pa, and the second sub-pixel electrode 121b is a block electrode corresponding to the second sub-pixel area Pb. The first sub-pixel electrode 121a and the second sub-pixel electrode 121b are used to control the brightness and darkness of the first sub-pixel area Pa and the second sub-pixel area Pb respectively, and then the brightness and darkness of the first sub-pixel area Pa and the second sub-pixel area Pb are combined with each other, so that the pixel unit P can present more grayscale displays, thereby increasing the number of grayscales of the cholesterol liquid crystal reflective display device 10.

[0066] Among them, the cholesterol liquid crystal in the first color cholesterol liquid crystal molecule 131 has three stable textures: P state (Planar, planar texture state, reflection state), FC state (Focal Conic, focal conic state, fog state) and H state (transparent state). In the P state, the reflection spectrum of the cholesterol liquid crystal is in the visible spectrum, and the cholesterol liquid crystal reflects bright colored light. The specific reflected color can be set according to the pitch of the cholesterol liquid crystal; in the FC state, the cholesterol liquid crystal no longer reflects the above colored light, and the light can be scattered through the cholesterol liquid crystal; in the H state, the cholesterol liquid crystal no longer reflects the above colored light, and the light can directly pass through the cholesterol liquid crystal, and it has no scattering effect on the light. Under the action of a certain electric field, these three states can be converted to each other.

[0067] Figure 5 Schematic diagram of the principle of the three-state transformation of cholesterol liquid crystal in the present invention, Figure 6 Schematic diagram of the driving signal for the three states of cholesterol liquid crystal in the present invention. Figure 5 and Figure 6As 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 cholesterol 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 electric signal V2 is applied to the pixel electrode 121. There is a voltage difference (for example, 20V) between the second electric signal V2 and the common voltage signal Vcom, and the second electric signal V2 gradually becomes the same as the common voltage signal Vcom within a first preset time, that is, the second electric 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 cholesterol liquid crystal in the first color cholesterol liquid crystal molecule 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 electric signal V3 is applied to the pixel electrode 121. There is a voltage difference (for example, 30V) between the third electric signal V3 and the common voltage signal Vcom, and the third electric signal V3 directly becomes the same as the common voltage signal Vcom at the second preset time, and the second preset time is less than the first preset time, that is, the third electric signal V3 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 common electrode 111 and the pixel electrode 121, and then the vertical electric field disappears quickly, so that the first color cholesterol liquid crystal molecules 131 rotate and stagnate in the P state, which is a reflective state. Among them, the arrangement direction of the cholesterol liquid crystal is different, the reflected visible light spectrum is different, and the remaining spectrum is transmitted, and the P state and the FC state do not need voltage to maintain. The reflection spectrum band (Δλ) of cholesterol liquid crystal molecules is proportional to the helical pitch (Po) and the average refractive index (n=(ne+no) / 2) of the cholesterol liquid crystal molecules, and the formula is: Δλ=nPo. Therefore, cholesterol liquid crystal molecules with different helical pitches can reflect light of different colors in the reflection state.

[0068] like Figure 4As shown, a plurality of scan lines 101, a plurality of data lines 102, a plurality of first thin film transistors 103 and a plurality of second thin film transistors 104 are provided on the array substrate 12, and a first thin film transistor 103 and a second thin film transistor 104 are provided in each pixel unit P. In this embodiment, the plurality of scan lines 101 include a first scan line 101a and a second scan line 101b, the upper side of each row of pixel units P is correspondingly provided with a first scan line 101a, the lower side of each row of pixel units P is correspondingly provided with a second scan line 101b, and the first scan line 101a and the second scan line 101b are provided between any two rows of pixel units P. In each pixel unit P, the first sub-pixel electrode 121a is conductively connected to the corresponding first scan line 101a and the data line 102 through the first thin film transistor 103, and the second sub-pixel electrode 121b is conductively connected to the corresponding second scan line 101b and the data line 102 through the second thin film transistor 104. The first sub-pixel electrode 121a and the second sub-pixel electrode 121b in each pixel unit P are connected to the same data line 102. The thin film transistor 103 and the second thin film transistor 104 each include a gate, an active layer, a drain and a source. The gate is located in the same layer as the scan line 101 and is electrically connected. The gate is separated from the active layer 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.

[0069] like Figure 2-Figure 4 As shown, in one embodiment, the liquid crystal layer 13 further includes first color dye liquid crystal molecules 132 mixed with the first color cholesterol liquid crystal molecules 131, and the first color dye liquid crystal molecules 132 rotate synchronously with the first color cholesterol liquid crystal molecules 131. 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 area corresponding to the first pixel unit P1, the opposing substrate 11 is provided with a color color resist layer 113 in the area corresponding to the second pixel unit P2, and the array substrate 12 is provided with a reflective layer in the area corresponding to the second pixel unit P2. Specifically, for example, the opposing substrate 11 is provided with a transparent color resist W in the area corresponding to the first pixel unit P1, and is provided with a color color resist in the area corresponding to the second pixel unit P2. In other embodiments, the opposing substrate 11 may not be provided with a transparent color resist W in the area corresponding to the first pixel unit P1, which is not limited here. Alternatively, the first color dye liquid crystal molecules 132 may not be provided in the liquid crystal layer 13, and the color color resist layer 113 may not be provided on the opposing substrate 11, that is, the other structures of the reflective display device 10 except the pixel structure and the array substrate 12 may adopt conventional settings.

[0070] When the first pixel unit P1 is in a bright state, the first color cholesterol liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the first pixel unit P1 are both in a flat position, so that the first color cholesterol liquid crystal molecules 131 in the area corresponding to the first pixel unit P1 are in a reflective state. When the first pixel unit P1 is in a dark state, the first color cholesterol liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the first pixel unit P1 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 cholesterol liquid crystal molecules 131 in the area corresponding to the first pixel unit P1 are in a transparent state or a foggy state, and the ambient light directly passes through the liquid crystal layer 13, is absorbed by the light absorption layer, and appears black or foggy black. When the second pixel unit P2 is in a bright state, the first color cholesterol liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the corresponding area of ​​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 cholesterol liquid crystal molecules 131 in the corresponding area of ​​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 cholesterol liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the corresponding area of ​​the second pixel unit P2 are both in a lying posture, so that the first color cholesterol liquid crystal molecules 131 in the corresponding area of ​​the second pixel unit P2 are all 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, and appears black.

[0071] It can be understood that the first pixel unit P1 and the second pixel unit P2 both include a first sub-pixel region Pa and a second sub-pixel region Pb. Specifically, for the first pixel unit P1, when the first sub-pixel area Pa and / or the second sub-pixel area Pb is in a bright state, the first color cholesterol liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the corresponding areas of the first sub-pixel area Pa and / or the second sub-pixel area Pb are both in a lying posture, so that the first color cholesterol liquid crystal molecules 131 in the corresponding areas of the first sub-pixel area Pa and / or the second sub-pixel area Pb are both in a reflective state; when the first sub-pixel area Pa and / or the second sub-pixel area Pb is in a dark state, the first color cholesterol liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the corresponding areas of the first sub-pixel area Pa and / or the second sub-pixel area Pb 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 cholesterol liquid crystal molecules 131 in the corresponding areas of the first sub-pixel area Pa and / or the second sub-pixel area Pb are both in a transparent state or a foggy state, and the ambient light directly passes through the liquid crystal layer 13, is absorbed by the light absorbing layer, and appears black or foggy black. For the second pixel unit P2, when the first sub-pixel area Pa and / or the second sub-pixel area Pb is in a bright state, the first color cholesterol liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the corresponding areas of the first sub-pixel area Pa and / or the second sub-pixel area Pb 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 cholesterol liquid crystal molecules 131 in the corresponding areas of the first sub-pixel area Pa and / or the second sub-pixel area Pb are both in a transparent state or a foggy state; when the first sub-pixel area Pa and / or the second sub-pixel area Pb is in a dark state, the first color cholesterol liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the corresponding areas of the first sub-pixel area Pa and / or the second sub-pixel area Pb are both in a lying posture, so that the first color cholesterol liquid crystal molecules 131 in the corresponding areas of the first sub-pixel area Pa and / or the second sub-pixel area Pb 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, presenting black.

[0072] The first color dye liquid crystal molecule 132 uses positive dye liquid crystal molecules. The light absorption capacity of the long axis of the positive dye liquid crystal molecule is greater than that of the short axis. The positive dye liquid crystal molecule has the characteristics that the long axis has a strong ability to absorb light, while the short axis has a very weak ability to absorb light. The long axis absorbs part of the light, thereby presenting a color corresponding to the first color dye liquid crystal molecule 132. For example, the first color dye liquid crystal molecule 132 uses purple dye liquid crystal molecules, and the long axis of the purple dye liquid crystal molecule can absorb the green band and present purple; similarly, if it is a red dye liquid crystal molecule, the long axis of the red dye liquid crystal molecule can absorb the cyan band and present red. Of course, the first color dye liquid crystal molecule 132 can also use other single color dye liquid crystal molecules, such as blue, green, yellow, etc.

[0073] In this embodiment, 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 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 blue, red, and green. In this embodiment, the first color cholesterol liquid crystal molecules 131 are blue cholesterol liquid crystal molecules, the first color dye liquid crystal molecules 132 are blue dye liquid crystal molecules, the second color resist layer 113a is a red resist, and the third color resist layer 113b is a green resist. Of course, in other embodiments, the first color cholesterol liquid crystal molecules 131 are blue cholesterol liquid crystal molecules, the first color dye liquid crystal molecules 132 are blue dye liquid crystal molecules, the second color color resist layer 113a is green color resist, and the third color color resist layer 113b is red color resist; or, the first color cholesterol liquid crystal molecules 131 are red cholesterol liquid crystal molecules, the first color dye liquid crystal molecules 132 are red dye liquid crystal molecules, the second color color resist layer 113a is blue color resist, and the third color color resist layer 113b is green color resist; or, the first color cholesterol liquid crystal molecules 131 are red cholesterol liquid crystal molecules, the first color dye liquid crystal molecules 132 are red dye liquid crystal molecules, the second color color resist layer 113a is blue color resist, and the third color color resist layer 113b is green color resist; 132 is a red dye liquid crystal molecule, the second color color resist layer 113a is a green color resist, and the third color color resist layer 113b is a blue color resist; or, the first color cholesterol liquid crystal molecule 131 is a green cholesterol liquid crystal molecule, the first color dye liquid crystal molecule 132 is a green dye liquid crystal molecule, the second color color resist layer 113a is a blue color resist, and the third color color resist layer 113b is a red color resist; or, the first color cholesterol liquid crystal molecule 131 is a green cholesterol liquid crystal molecule, the first color dye liquid crystal molecule 132 is a green dye liquid crystal molecule, the second color color resist layer 113a is a red color resist, and the third color color resist layer 113b is a blue color resist. No limitation is made here.

[0074] In this embodiment, the plurality of pixel electrodes 121 include a transparent pixel electrode 1211 and a reflective pixel electrode 1212. The transparent pixel electrode 1211 corresponds to the first pixel unit P1, the reflective pixel electrode 1212 corresponds to the second pixel unit P2, and the reflective pixel electrode 1212 is reused as a reflective layer. It can be understood that the transparent pixel electrode 1211 and the reflective pixel electrode 1212 both include a first sub-pixel electrode 121a and a second sub-pixel electrode 121b. The transparent pixel electrode 1211 can be made of a transparent electrode such as indium tin oxide (ITO) or indium zinc oxide (IZO), and the reflective pixel electrode 1212 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 1211 and the reflective pixel electrode 1212 are first etched from the same transparent conductive layer, and then a layer of aluminum (Al) or silver (Ag) is covered on the reflective pixel electrode 1212, so that the conductivity of the reflective pixel electrode 1212 can be increased. Of course, the reflective pixel electrode 1212 may also be made of aluminum (Al) or silver (Ag) alone. Alternatively, in other embodiments, the pixel electrodes 121 may also be made of transparent electrodes such as indium tin oxide (ITO) or indium zinc oxide (IZO), and the reflective layer may be made of a layer of aluminum (Al) or silver (Ag) alone.

[0075] Furthermore, a light absorbing layer 122 is provided on the array substrate 12, and the light absorbing layer 122 is used to absorb the light passing through the liquid crystal layer 13, so that the reflective display device 10 is darker in the black state to improve the contrast. Optionally, the light absorbing layer 122 uses black ink, and the L value (representing the brightness) of the black ink is greater than 25 and the OD value (optical density) is greater than 4, so that 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, and the light absorbing layer 122 covers the side of the array substrate 12 away from the liquid crystal layer 13.

[0076] Furthermore, a black matrix 112 is provided on the counter substrate 11, and the black matrix 112 corresponds to the non-display area at the edge of the reflective display device 10, while the black matrix 112 may not be provided in the display area of ​​the reflective display device 10. In this embodiment, the second color color resist layer 113a and the third color color resist layer 113b of the color resist layer 113 in the counter substrate 11 correspond to each pixel electrode 121 in the array substrate 12, that is, a gap is provided between the second color color resist layer 113a and the third color color resist layer 113b, and the gap corresponds to the scan line 101, the data line 102 and the thin film transistor 103 on the counter substrate 11. Since the scan line 101, the data line 102 and the thin film transistor 103 on the counter substrate 11 are made of metal materials, the scan line 101, the data line 102 and the thin film transistor 103 at the gap can reflect the ambient light to a certain extent, so as to improve the 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 herein.

[0077] The present application also provides a driving method of a reflective display device, which is used to drive the reflective display device 10 as described above. The driving method includes:

[0078] Figure 3 Schematic diagram of the pixel arrangement structure of the reflective display device in the dark state in the first embodiment of the present invention. Figure 3 As shown, when the pixel unit P is in a dark state, the first sub-pixel area Pa and the second sub-pixel area Pb are controlled to be in a dark state. In this embodiment, for the first pixel unit P1, when the first pixel unit P1 is in a dark state, the first color cholesterol liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the corresponding areas of the first sub-pixel area Pa and the second sub-pixel area Pb 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 cholesterol liquid crystal molecules 131 in the corresponding areas of the first sub-pixel area Pa and the second sub-pixel area Pb are in a transparent state or a foggy state, and the ambient light directly passes through the liquid crystal layer 13, is absorbed by the light absorption layer, and appears black or foggy black. For the second pixel unit P2, when the second pixel unit P2 is in a dark state, the first color cholesterol liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the corresponding areas of the first sub-pixel area Pa and the second sub-pixel area Pb are controlled to be in a lying posture, so that the first color cholesterol liquid crystal molecules 131 in the corresponding areas of the first sub-pixel area Pa and the second sub-pixel area Pb are 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, showing black.

[0079] Figure 7Schematic diagram of the pixel arrangement structure of the reflective display device in the first grayscale brightness state in the first embodiment of the present invention. Figure 7 As shown, when the pixel unit P is in the first grayscale brightness, the first sub-pixel area Pa is controlled to be in a bright state, and the second sub-pixel area Pb is controlled to be in a dark state. In this embodiment, for the first pixel unit P1, when the first sub-pixel area Pa is in a bright state, the first color cholesterol liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the first sub-pixel area Pa are controlled to be in a flat posture, so that the first color cholesterol liquid crystal molecules 131 in the area corresponding to the first sub-pixel area Pa are in a reflective state; when the second sub-pixel area Pb is in a dark state, the first color cholesterol liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the second sub-pixel area Pb 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 cholesterol liquid crystal molecules 131 in the area corresponding to the second sub-pixel area Pb are in a transparent state or a foggy state, and the ambient light directly passes through the liquid crystal layer 13, is absorbed by the light absorption layer, and appears black or foggy black. For the second pixel unit P2, when the first sub-pixel area Pa is in a bright state, the first color cholesterol liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the corresponding area of ​​the first sub-pixel area Pa are controlled to be perpendicular to the opposing substrate 11 and the array substrate 12 or are in a disordered tilted state, so that the first color cholesterol liquid crystal molecules 131 in the corresponding area of ​​the first sub-pixel area Pa are in a transparent state or a foggy state; when the second sub-pixel area Pb is in a dark state, the first color cholesterol liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the corresponding area of ​​the second sub-pixel area Pb are controlled to be in a lying posture, so that the first color cholesterol liquid crystal molecules 131 in the corresponding area of ​​the second sub-pixel area Pb are 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, and appears black.

[0080] Figure 8 Schematic diagram of the pixel arrangement structure of the reflective display device in the second grayscale brightness state in the first embodiment of the present invention. Figure 8As shown, when the pixel unit P is in the second grayscale brightness, the first sub-pixel area Pa is controlled to be in a dark state, and the second sub-pixel area Pb is controlled to be in a bright state. In this embodiment, for the first pixel unit P1, when the first sub-pixel area Pa is in a dark state, the first color cholesterol liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the first sub-pixel area Pa 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 cholesterol liquid crystal molecules 131 in the area corresponding to the first sub-pixel area Pa are in a transparent state or a foggy state, and the ambient light directly passes through the liquid crystal layer 13 and is absorbed by the light absorption layer, showing black or foggy black; when the second sub-pixel area Pb is in a bright state, the first color cholesterol liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the second sub-pixel area Pb are controlled to be in a flat posture, so that the first color cholesterol liquid crystal molecules 131 in the area corresponding to the second sub-pixel area Pb are in a reflective state. For the second pixel unit P2, when the first sub-pixel area Pa is in a dark state, the first color cholesterol liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the first sub-pixel area Pa are controlled to be in a lying posture, so that the first color cholesterol liquid crystal molecules 131 in the area corresponding to the first sub-pixel area Pa are all 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, showing black; when the second sub-pixel area Pb is in a bright state, the first color cholesterol liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the second sub-pixel area Pb 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 cholesterol liquid crystal molecules 131 in the area corresponding to the second sub-pixel area Pb are all in a transparent state or a foggy state.

[0081] Fig. 9 Schematic diagram of the pixel arrangement structure of the reflective display device in the third grayscale brightness state in the first embodiment of the present invention. Fig. 9As shown, when the pixel unit P is in the third grayscale brightness, the first sub-pixel area Pa and the second sub-pixel area Pb are controlled to be in a bright state. In this embodiment, for the first pixel unit P1, when the first pixel unit P1 is in a bright state, the first color cholesterol liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the corresponding areas of the first sub-pixel area Pa and the second sub-pixel area Pb are controlled to be in a flat posture, so that the first color cholesterol liquid crystal molecules 131 in the corresponding areas of the first sub-pixel area Pa and the second sub-pixel area Pb are in a reflective state. For the second pixel unit P2, when the second pixel unit P2 is in a bright state, the first color cholesterol liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the corresponding areas of the first sub-pixel area Pa and the second sub-pixel area Pb 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 cholesterol liquid crystal molecules 131 in the corresponding areas of the first sub-pixel area Pa and the second sub-pixel area Pb are in a transparent state or a foggy state.

[0082] Fig.10 Schematic diagram of the structure of the reflective display device in the first embodiment of the present invention when displaying a pure blue picture. Fig.10 As shown, when the reflective display device 10 displays the first color (blue), 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. Specifically, the first color cholesterol 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 posture, so that the first color cholesterol 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 (blue light); and the first color cholesterol 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 posture, so that the first color cholesterol liquid crystal molecules 131 in the area corresponding to the second pixel unit P2 are 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, and presents black.

[0083] Fig.11 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 red picture. Fig.12 FIG. 2 is a second structural diagram of the reflective display device in the first embodiment of the present invention when displaying a pure red image. Fig.11 and Fig.12 As shown, when the reflective display device 10 displays the second color (red), 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. Fig.11As shown, the first color cholesterol 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 cholesterol liquid crystal molecules 131 in the area corresponding to the first pixel unit P1 are in a transparent state. At this time, the ambient light directly passes through the liquid crystal layer 13, is absorbed by the light absorption layer 122, and appears black; and the first color cholesterol 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 The first color cholesterol liquid crystal molecules 131 are all 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, showing black; and the first color cholesterol 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 cholesterol 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 (red light) corresponding to the color of the second color resist layer 113a. Or, Fig.12 As shown, the first color cholesterol liquid crystal molecules 131 in the area corresponding to the first pixel unit P1 are controlled to be in a disordered tilted state, so that the first color cholesterol 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; and the first color cholesterol 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 posture, so that the first color cholesterol liquid crystal molecules 131 in the area corresponding to the third color pixel unit P22 are all in a reflective state, and the ambient light is absorbed by the color blocking layer 122. Layer 113 and the first color dye liquid crystal molecules 132 absorb together and appear black; and the first color cholesterol 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 cholesterol 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 the light (red light) corresponding to the color of the second color color resist layer 113a. Since the first color cholesterol liquid crystal molecules 131 are in a foggy state, the second color pixel unit P21 is in a slow reflection state, thereby achieving a foggy red display effect.

[0084] Fig.13 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 picture. Fig.14 FIG. 2 is a second structural diagram of the reflective display device in the first embodiment of the present invention when displaying a pure green image. Fig.13 and Fig.14As shown, when the reflective display device 10 displays the third color (green), 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. Fig.13 As shown, the first color cholesterol 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 cholesterol liquid crystal molecules 131 in the area corresponding to the first pixel unit P1 are in a transparent state. At this time, the ambient light directly passes through the liquid crystal layer 13, is absorbed by the light absorption layer 122, and appears black; and the first color cholesterol 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 posture, so that the area corresponding to the second color pixel unit P21 The first color cholesterol liquid crystal molecules 131 are all 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, showing black; and the first color cholesterol 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 cholesterol 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 resist layer 113b (green light). Or, Fig.14 As shown, the first color cholesterol 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 disordered tilted state, so that the first color cholesterol 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. ; and controlling the first color cholesterol liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the second color pixel unit P21 to be in a lying posture, so that the first color cholesterol liquid crystal molecules 131 in the area corresponding to the second color pixel unit P21 are 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 together, and appears black; and controlling the first color cholesterol liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the third color pixel unit P22 to be in a disordered tilted state, so that the first color cholesterol liquid crystal molecules 131 in the area corresponding to the third color pixel unit P22 are in a foggy state. At this time, the third color pixel unit P22 reflects the light corresponding to the color of the third color resist layer 113b (green light). Since the first color cholesterol liquid crystal molecules 131 are in a foggy state, the third color pixel unit P22 is in a slow reflection state, achieving a foggy green display effect.

[0085] Fig.15This is one of the structural schematic diagrams of the reflective display device in the first embodiment of the present invention when displaying a white picture. Fig.16 FIG. 2 is a second structural diagram of the reflective display device in the first embodiment of the present invention when displaying a white image. Fig.15 and Fig.16 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. Fig.15 As shown, the first color cholesterol 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 posture, so that the first color cholesterol 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 (blue light); and the first color cholesterol 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 area corresponding to the second color pixel unit P21 The first color cholesterol 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 color resist layer 113a (red light); and the first color cholesterol 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 cholesterol 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 color resist layer 113b (green light). Or, Fig.16As shown, the first color cholesterol 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 posture, so that the first color cholesterol 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 (blue light); and the first color cholesterol 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 cholesterol 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 the second color color resist layer 11. 3a color corresponding light (red light), because the first color cholesterol liquid crystal molecules 131 are in a foggy state, the second color pixel unit P21 is in a slow reflection state, to achieve a foggy red display effect; and control the first color cholesterol liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the corresponding area of ​​the third color pixel unit P22 to be in a disordered tilt state, so that the first color cholesterol liquid crystal molecules 131 in the corresponding area of ​​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 color resist layer 113b (green light), because the first color cholesterol liquid crystal molecules 131 are in a foggy state, the third color pixel unit P22 is in a slow reflection state, to achieve a foggy green display effect. Among them, the blue, red and green three-color light is mixed with each other to form white light.

[0086] Fig.17 Schematic diagram of the structure of the reflective display device in the first embodiment of the present invention when displaying a pure black picture. Fig.17As shown, when the reflective display device 10 displays a pure black screen, all the first pixel units P1 and the second pixel units P2 (the second color pixel unit P21 and the third color pixel unit P22) are controlled to be in a dark state. Specifically, the first color cholesterol 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 cholesterol liquid crystal molecules 131 in the corresponding area of ​​the first pixel unit P1 are 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, showing black; and the first color cholesterol 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 posture, so that the first color cholesterol liquid crystal molecules 131 in the corresponding area of ​​the second pixel unit P2 (the second color pixel unit P21 and the third color pixel unit P22) are 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, showing black. Of course, the first color cholesterol 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 cholesterol 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.

[0087] In this embodiment, the reflective display device 10 can also display colors. When the reflective display device 10 displays colors, the corresponding first pixel unit P1, second color pixel unit P21, and third color pixel unit P22 can be controlled to be in a bright state. Specifically, the brightness of the first pixel unit P1, the second color pixel unit P21, and the third color pixel unit P22 can be adjusted by controlling the brightness and darkness of the first sub-pixel area Pa and the second sub-pixel area Pb in the first pixel unit P1, the second color pixel unit P21, and the third color pixel unit P22. For details, refer to Figure 3 , Figure 7-Figure 9 Description.

[0088] [Example 2]

[0089] Fig.18 This is one of the planar structural schematic diagrams of the array substrate in the second embodiment of the present invention. Fig.19 FIG. 2 is a second schematic diagram of the planar structure of the array substrate in the second embodiment of the present invention. Fig.18 and Fig.19 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 17 ) are substantially the same, except that, in this embodiment:

[0090] like Fig.18 As shown, a plurality of scan lines 101, a plurality of data lines 102, a plurality of first thin film transistors 103 and a plurality of second thin film transistors 104 are provided on the array substrate 12, and a first thin film transistor 103 and a second thin film transistor 104 are provided in each pixel unit P. In this embodiment, the plurality of scan lines 101 include a first scan line 101a and a second scan line 101b, the upper side of each row of pixel units P is correspondingly provided with a first scan line 101a, the lower side of each row of pixel units P is correspondingly provided with a second scan line 101b, and the first scan line 101a and the second scan line 101b are provided between any two rows of pixel units P. In each pixel unit P, the first sub-pixel electrode 121a is conductively connected to the corresponding first scan line 101a and the data line 102 through the first thin film transistor 103, and the second sub-pixel electrode 121b is conductively connected to the corresponding second scan line 101b and the data line 102 through the second thin film transistor 104. The first sub-pixel electrode 121a and the second sub-pixel electrode 121b in each pixel unit P are respectively connected to two different data lines 102.

[0091] like Fig.19 As shown, in one embodiment, the array substrate 12 is provided with a plurality of scan lines 101, a plurality of data lines 102, a plurality of first thin film transistors 103, and a plurality of second thin film transistors 104. The plurality of data lines 102 include a first data line 102a and a second data line 102b. The left side of each column of pixel units P is correspondingly provided with a first data line 102a, the right side of each column of pixel units P is correspondingly provided with a second data line 102b, and the first data line 102a and the second data line 102b are provided between any two columns of pixel units P. In each pixel unit P, the first sub-pixel electrode 121a is conductively connected to the corresponding scan line 101 and the first data line 102a through the first thin film transistor 103, and the second sub-pixel electrode 121b is conductively connected to the corresponding scan line 101 and the second data line 102b through the second thin film transistor 104. The first sub-pixel electrode 121a and the second sub-pixel electrode 121b in each pixel unit P are connected to the same scan line 101. Of course, in other embodiments, the first sub-pixel electrode 121 a and the second sub-pixel electrode 121 b in each pixel unit P may also be connected to two different scan lines 101 respectively.

[0092] It should be understood by those skilled in the art that the rest of the structure and working principle of this embodiment are the same as those of the first embodiment and will not be described in detail here.

[0093] [Example 3]

[0094] Fig. 20 Schematic diagram of the planar structure of the gate drive circuit in the third embodiment of the present invention. Fig. 20 As shown, the reflective display device and driving method provided in the third embodiment of the present invention are similar to those provided in the first embodiment ( Figures 1 to 17 ) are substantially the same, except that, in this embodiment:

[0095] The array substrate 12 is provided with a gate driving circuit, which includes a plurality of main scanning lines 1, a first control line 2, a second control line 3, a plurality of third thin film transistors 4 and a plurality of fourth thin film transistors 5. The first scanning line 101a is conductively connected to the first control line 2 and the corresponding main scanning line 1 through the third thin film transistor 4, and the second scanning line 101b is conductively connected to the second control line 3 and the corresponding main scanning line 1 through the fourth thin film transistor 5. The third thin film transistors 4 controlling the first scanning line 101a and the fourth thin film transistors 5 controlling the second scanning line 101b on the upper and lower sides of the same row of pixel units P are connected to the same main scanning line 1. By designing the gate driving circuit in this embodiment, the dual-gate architecture in this application can adopt a conventional gate driving chip (G-IC), and the pins of the gate driving chip can be reduced by half.

[0096] The present application also provides a driving method for a reflective display device, which is similar to the first embodiment ( Figures 1 to 17 ) is substantially the same, except that, in this embodiment, the driving method further comprises:

[0097] Fig.21 is a waveform diagram of the first gate drive signal in the third embodiment of the present invention. Fig.21 As shown, the first control line 2 and the second control line 3 control the third thin film transistor 4 and the fourth thin film transistor 5 to be turned on or off alternately. For example, when the first scan line 101a is scanned, the first control line 2 is at a high level (H) and controls the third thin film transistor 4 to be turned on, and the second control line 3 is at a low level (L) and controls the fourth thin film transistor 5 to be turned off; when the second scan line 101b is scanned, the first control line 2 is at a low level (L) and controls the third thin film transistor 4 to be turned off, and the second control line 3 is at a high level (H) and controls the fourth thin film transistor 5 to be turned on.

[0098] Fig. 22 This is one of the waveform diagrams of the second gate driving signal in the third embodiment of the present invention. Fig.23 FIG. 2 is a second waveform diagram of the second gate driving signal in the third embodiment of the present invention. In another embodiment, Fig. 22 As shown, in the Nth frame, the first control line 2 is at a high level (H) and controls the third thin film transistor 4 to be turned on, and the second control line 3 is at a low level (L) and controls the fourth thin film transistor 5 to be turned off; Fig.23As shown, in the N+1 frame, the first control line 2 is at a low level (L) and controls the third thin film transistor 4 to be turned off, and the second control line 3 is at a high level (H) and controls the fourth thin film transistor 5 to be turned on, and N is an integer greater than or equal to 1. In the N frame, the first control line 2 can be always at a high level (H), or can be switched between a high level (H) and a low level (L), and it is switched once each time a scanning line 101 is scanned; in the N+1 frame, the second control line 3 can be always at a high level (H), or can be switched between a high level (H) and a low level (L), and it is switched once each time a scanning line 101 is scanned.

[0099] It should be understood by those skilled in the art that the rest of the structure and working principle of this embodiment are the same as those of the first embodiment and will not be described in detail here.

[0100] [Example 4]

[0101] Fig.24 Schematic diagram of the structure of the reflective display device in the initial state in the fourth embodiment of the present invention. Fig.24 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 17 )、Example 2 ( Fig.18 and Fig.19 )、Example 3 ( Figure 20 to Figure 23 ) are substantially the same, except that, in this embodiment:

[0102] A black matrix 112 is disposed on the counter substrate 11. The black matrix 112 is disposed in both the display area and the non-display area of ​​the reflective display device 10. The black matrix 112 separates a plurality of pixel units P from each other in the display area. Compared with the first embodiment, the problem of color mixing between adjacent pixel units P can be avoided in this embodiment, but the brightness of the reflective display device 10 will be reduced.

[0103] It should be understood by those skilled in the art that the rest of the structure and working principle of this embodiment are the same as those of Embodiment 1, Embodiment 2, and Embodiment 3, and will not be described in detail here.

[0104] [Example 5]

[0105] Fig.25 It is a schematic structural diagram of the reflective display device in the initial state in the fifth embodiment of the present invention. Fig.26 It is a schematic diagram of the pixel arrangement structure of the reflective display device in the fifth embodiment of the present invention. Fig. 27 FIG. 1 is a schematic diagram of the planar structure of the array substrate in the fifth embodiment of the present invention. Figure 25 to Figure 27 As shown, the reflective display device and driving method provided in the fifth embodiment of the present invention are similar to those in the first embodiment ( Figures 1 to 17 )、Example 2 ( Fig.18 and Fig.19 )、Example 3 ( Figure 20 to Figure 23 ), Embodiment 4 ( Fig.24 ) are substantially the same, except that, in this embodiment:

[0106] 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. That is, the second pixel unit P2 only has the second color pixel unit P21, and the color resist layer 113 only has the second color resist layer 113a, and the plurality of pixel units P have two colors of pixel units P. Among them, a column of first pixel units P1 and a column of second color pixel units P21 are alternately arranged in the row direction. In this embodiment, the first color cholesterol liquid crystal molecules 131 are blue cholesterol liquid crystal molecules, the first color dye liquid crystal molecules 132 are blue dye liquid crystal molecules, and the second color resist layer 113a is a cyan color resist. Of course, in other embodiments, the first color and the second color may also be other complementary colors, so that a white screen can be achieved after being mixed with each other.

[0107] The present application also provides a driving method of a reflective display device, which is used to drive the reflective display device 10 as described above. The driving method includes:

[0108] When the reflective display device 10 displays the first color (blue), 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. Specifically, the first color cholesterol 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 cholesterol 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 (blue light); and the first color cholesterol liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the second pixel unit P2 (second color pixel unit P21) are controlled to be in a flat position, so that the first color cholesterol liquid crystal molecules 131 in the area corresponding to the second pixel unit P2 are 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, and the color is black.

[0109] When the reflective display device 10 displays the second color (cyan), 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. Specifically, the first color cholesterol 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 opposite substrate 11 and the array substrate 12, so that the first color cholesterol liquid crystal molecules 131 in the corresponding area of ​​the first pixel unit P1 are 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, showing black; and the first color cholesterol liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the corresponding area of ​​the second pixel unit P2 (the second color pixel unit P21) are controlled to be perpendicular to the opposite substrate 11 and the array substrate 12 or to be in a disordered tilted state, so that the first color cholesterol liquid crystal molecules 131 in the corresponding area of ​​the second pixel unit P2 are in a transparent state or a foggy state. At this time, the second pixel unit P2 reflects the light (cyan light) corresponding to the color of the second color color resist layer 113a.

[0110] 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. Specifically, the first color cholesterol 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 cholesterol 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 (blue light); and the first color cholesterol 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) 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 cholesterol liquid crystal molecules 131 in the area corresponding to the second pixel unit P2 are in a transparent state or a foggy state, and at this time, the second pixel unit P2 reflects the light corresponding to the color of the second color color resist layer 113a (cyan light). Wherein, the blue and cyan light are mixed with each other to form white light.

[0111] When the reflective display device 10 displays a pure black screen, all the first pixel units P1 and the second pixel units P2 (the second color pixel units P21) are controlled to be in a dark state. Specifically, the first color cholesterol 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 cholesterol liquid crystal molecules 131 in the corresponding area of ​​the first pixel unit P1 are 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, showing black; and the first color cholesterol 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 lying posture, so that the first color cholesterol liquid crystal molecules 131 in the corresponding area of ​​the second pixel unit P2 (are 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, showing black.

[0112] It should be understood by those skilled in the art that the rest of the structure and working principle of this embodiment are the same as those of Embodiment 1, Embodiment 2, Embodiment 3, and Embodiment 4, and will not be described in detail here.

[0113] [Example 6]

[0114] Fig.28 Schematic diagram of the structure of the reflective display device in the initial state in the sixth embodiment of the present invention. Fig.28 As shown, the reflective display device and driving method provided in the sixth embodiment of the present invention are similar to those in the first embodiment ( Figures 1 to 17 )、Example 2 ( Fig.18 and Fig.19 )、Example 3 ( Figure 20 to Figure 23 ), Embodiment 4 ( Fig.24 )、Example 5 ( Figure 25 to Figure 27 ) are substantially the same, except that, in this embodiment:

[0115] A light absorbing layer 122 is provided on the array substrate 12, and the light absorbing layer 122 is used to absorb the light passing through the liquid crystal layer 13, so that the reflective display device 10 is darker in the black state to improve the contrast. Optionally, the light absorbing layer 122 uses black ink, and the L value (representing the brightness) of the black ink is greater than 25 and the OD value (optical density) is greater than 4, so that 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 projection of the light absorbing layer 122 on the array substrate 12 coincides with the first pixel unit P1, that is, the light absorbing layer 122 is only arranged on the area corresponding to the first pixel unit P1 on the array substrate 12. Among them, the light absorbing layer 122 can be arranged on the side of the array substrate 12 facing the liquid crystal layer 13 and stacked with the transparent pixel electrode 1211.

[0116] 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, Embodiment 3, Embodiment 4, and Embodiment 5, and will not be described in detail here.

[0117] In this document, the directional words such as up, down, left, right, front, and back are defined by the positions of the structures in the drawings and the positions of the structures relative to each other, just for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of the directional words should not limit the scope of protection claimed in this application. It should also be understood that the terms "first" and "second" used in this document are only used to distinguish names and are not used to limit quantity and order.

[0118] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used 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 modification, equivalent change and modification 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 still fall within the protection scope 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), wherein the liquid crystal layer (13) comprises cholesterol liquid crystal molecules (131) of a first color, wherein the cholesterol liquid crystal molecules (131) of the first color reflect light of a first color 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) comprises a plurality of pixel units (P) distributed in an array, each of the pixel units (P) being provided with the pixel electrode (121) correspondingly, the pixel unit (P) comprising a first sub-pixel region (Pa) and a second sub-pixel region (Pb) having different areas, the pixel electrode (121) comprising a first sub-pixel electrode (121a) and a second sub-pixel electrode (121b) which are independently controlled from each other, the first sub-pixel electrode (121a) corresponding to the first sub-pixel region (Pa), and the second sub-pixel electrode (121b) corresponding to the second sub-pixel region (Pb).

2. The reflective display device according to claim 1, characterized in that: The array substrate (12) is provided with a plurality of scan lines (101), a plurality of data lines (102), a plurality of first thin film transistors (103) and a plurality of second thin film transistors (104); the plurality of scan lines (101) include a first scan line (101a) and a second scan line (101b); the upper side of each row of pixel units (P) is correspondingly provided with the first scan line (101a); the lower side of each row of pixel units (P) is correspondingly provided with the second scan line (101b); and the first scan line (101a) and the second scan line (101b) are provided between any two rows of pixel units (P); In each of the pixel units (P), the first sub-pixel electrode (121a) is conductively connected to the corresponding first scanning line (101a) and the data line (102) through the first thin film transistor (103), and the second sub-pixel electrode (121b) is conductively connected to the corresponding second scanning line (101b) and the data line (102) through the second thin film transistor (104).

3. The reflective display device according to claim 2, characterized in that: The first sub-pixel electrode (121a) and the second sub-pixel electrode (121b) in each of the pixel units (P) are connected to the same data line (102); or the first sub-pixel electrode (121a) and the second sub-pixel electrode (121b) in each of the pixel units (P) are respectively connected to two different data lines (102).

4. The reflective display device according to claim 2, wherein: The array substrate (12) is provided with a gate drive circuit, the gate drive circuit comprising a plurality of main scanning lines (1), a first control line (2), a second control line (3), a plurality of third thin film transistors (4) and a plurality of fourth thin film transistors (5); the first scanning line (101a) is conductively connected to the first control line (2) and the corresponding main scanning line (1) through the third thin film transistor (4); the second scanning line (101b) is conductively connected to the second control line (3) and the corresponding main scanning line (1) through the fourth thin film transistor (5); the third thin film transistors (4) controlling the first scanning line (101a) and the fourth thin film transistors (5) controlling the second scanning line (101b) on the upper and lower sides of the same row of pixel units (P) are connected to the same main scanning line (1).

5. The reflective display device according to claim 1, characterized in that: The array substrate (12) is provided with a plurality of scanning lines (101), a plurality of data lines (102), a plurality of first thin film transistors (103) and a plurality of second thin film transistors (104); the plurality of data lines (102) include a first data line (102a) and a second data line (102b); the first data line (102a) is correspondingly provided on the left side of each column of pixel units (P); the second data line (102b) is correspondingly provided on the right side of each column of pixel units (P); and the first data line (102a) and the second data line (102b) are provided between any two columns of pixel units (P); In each of the pixel units (P), the first sub-pixel electrode (121a) is conductively connected to the corresponding scan line (101) and the first data line (102a) through the first thin film transistor (103), and the second sub-pixel electrode (121b) is conductively connected to the corresponding scan line (101) and the second data line (102b) through the second thin film transistor (104).

6. The reflective display device according to any one of claims 1 to 5, characterized in that: The liquid crystal layer (13) further comprises first color dye liquid crystal molecules (132) mixed with the first color cholesterol liquid crystal molecules (131), and the first color dye liquid crystal molecules (132) rotate synchronously with the first color cholesterol liquid crystal molecules (131); 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 an area corresponding to the first pixel unit (P1); the opposing substrate (11) is provided with a color resist layer (113) in an area corresponding to the second pixel unit (P2); and the array substrate (12) is provided with a reflective layer in an area corresponding to the second pixel unit (P2); When the first pixel unit (P1) is in a bright state, the first color cholesterol 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 cholesterol 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 cholesterol 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 cholesterol liquid crystal molecules (131) in the area corresponding to the second pixel unit (P2) are all in a reflective state.

7. The reflective display device according to claim 6, characterized in that: 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), wherein the first color and the second color are complementary colors; Alternatively, 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 first color, the second color and the third color are each one of red, green and blue.

8. The reflective display device according to claim 6, characterized in that: The plurality of pixel electrodes (121) include a transparent pixel electrode (1211) and a reflective pixel electrode (1212), the transparent pixel electrode (1211) corresponds to the first pixel unit (P1), the reflective pixel electrode (1212) corresponds to the second pixel unit (P2), and the reflective pixel electrode (1212) is reused as the reflective layer; Alternatively, a light absorbing layer (122) is provided on the array substrate (12), the light absorbing layer (122) being used to absorb light passing through the liquid crystal layer (13), the projection of the light absorbing layer (122) on the array substrate (12) being overlapped with the first pixel unit (P1), or the light absorbing layer (122) is a planar structure that covers the entire surface of the array substrate (12); Alternatively, a black matrix (112) is provided on the opposing substrate (11), and the black matrix (112) corresponds 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.

9. A method for driving a reflective display device, characterized in that: Used to drive the reflective display device (10) according to any one of claims 1 to 8, the driving method comprising: When the pixel unit (P) is in a dark state, controlling the first sub-pixel region (Pa) and the second sub-pixel region (Pb) to be in a dark state; When the pixel unit (P) is at a first grayscale brightness, the first sub-pixel region (Pa) is controlled to be in a bright state, and the second sub-pixel region (Pb) is controlled to be in a dark state; When the pixel unit (P) is at a second grayscale brightness, the first sub-pixel region (Pa) is controlled to be in a dark state, and the second sub-pixel region (Pb) is controlled to be in a bright state; When the pixel unit (P) is at a third grayscale brightness, the first sub-pixel region (Pa) and the second sub-pixel region (Pb) are controlled to be in a bright state.

10. The driving method of the reflective display device according to claim 9, characterized in that: The array substrate (12) is provided with a plurality of scan lines (101), a plurality of data lines (102), a plurality of first thin film transistors (103) and a plurality of second thin film transistors (104); the plurality of scan lines (101) include a first scan line (101a) and a second scan line (101b); the upper side of each row of pixel units (P) is correspondingly provided with the first scan line (101a); the lower side of each row of pixel units (P) is correspondingly provided with the second scan line (101b); and the first scan line (101a) and the second scan line (101b) are provided between any two rows of pixel units (P); in each pixel unit (P), the first sub-pixel electrode (121a) is conductively connected to the corresponding first scan line (101a) and the data line (102) through the first thin film transistor (103); and the second sub-pixel electrode (121b) is conductively connected to the corresponding first scan line (101a) and the data line (102) through the second thin film transistor (1 04) is conductively connected to the corresponding second scanning line (101b) and the data line (102); a gate driving circuit is provided on the array substrate (12), the gate driving circuit comprises a plurality of main scanning lines (1), a first control line (2), a second control line (3), a plurality of third thin film transistors (4) and a plurality of fourth thin film transistors (5); the first scanning line (101a) is conductively connected to the first control line (2) and the corresponding main scanning line (1) through the third thin film transistor (4); the second scanning line (101b) is conductively connected to the second control line (3) and the corresponding main scanning line (1) through the fourth thin film transistor (5); the third thin film transistor (4) controlling the first scanning line (101a) and the fourth thin film transistor (5) controlling the second scanning line (101b) on the upper and lower sides of the same row of pixel units (P) are connected to the same main scanning line (1); The driving method comprises: The first control line (2) and the second control line (3) control the third thin film transistor (4) and the fourth thin film transistor (5) to be alternately turned on or off; Alternatively, in the Nth frame, the first control line (2) controls the third thin film transistor (4) to be turned on, and the second control line (3) controls the fourth thin film transistor (5) to be turned off; in the N+1th frame, the first control line (2) controls the third thin film transistor (4) to be turned off, and the second control line (3) controls the fourth thin film transistor (5) to be turned on, where N is an integer greater than or equal to 1.

Images