Reflective display device and control method

Abstract

The invention discloses a reflective display device and a control method, the reflective display device comprises a liquid crystal box and an electronic ink screen stacked on the lower side of the liquid crystal box, and first pixel units of the liquid crystal box are in one-to-one correspondence with second pixel units of the electronic ink screen; the liquid crystal box comprises a first opposed substrate, a first array substrate and a cholesterol liquid crystal layer; the electronic ink screen comprises a second opposite substrate, a second array substrate and an ink capsule, a second pixel electrode is arranged on the second array substrate, an auxiliary electrode is arranged on the second opposite substrate, and the second pixel electrode comprises a first sub-pixel electrode block and a second sub-pixel electrode block which are independent from each other. The electronic ink screen is arranged below the cholesterol liquid crystal box, and the second pixel electrode of the electronic ink screen is divided into the first sub-pixel electrode block and the second sub-pixel electrode block which are mutually independent, so that the electronic ink screen can control at least three kinds of brightness, and the gray scale brightness of the cholesterol liquid crystal box is richer.

Description

Technical Field

[0001] The present invention relates to the technical field of displays, and in particular to a reflective display device and a control method thereof. 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, the existing electronic paper display technology is not very mature, the mass production efficiency is low, the manufacturing cost is relatively high, and the existing electronic paper display cannot realize color display and white display, and the grayscale brightness of this electronic paper display cannot be adjusted. Summary of the invention

[0004] 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 control method to solve the problem that the grayscale brightness of the electronic paper display in the prior art cannot be adjusted.

[0005] The purpose of the present invention is achieved through the following technical solutions: The present invention provides a reflective display device, comprising a liquid crystal box and an electronic ink screen stacked on the lower side of the liquid crystal box, wherein the liquid crystal box has a plurality of first pixel units distributed in an array, and the electronic ink screen has second pixel units corresponding to the first pixel units one by one; The liquid crystal box comprises a first opposing substrate, a first array substrate arranged opposite to the first opposing substrate, and a cholesterol liquid crystal layer located between the first opposing substrate and the first array substrate, wherein the cholesterol liquid crystal layer reflects light of a first color in a reflection state, the first array substrate is provided with first pixel electrodes corresponding to the first pixel units one by one, and the first opposing substrate is provided with a first common electrode matched with the first pixel electrode; The electronic ink screen includes a second opposing substrate, a second array substrate arranged opposite to the second opposing substrate, and ink capsules located between the second opposing substrate and the second array substrate. All of the ink capsules are provided with electrophoretic liquid and black ink particles and second color ink particles of opposite polarities. The second color ink particles are used to reflect light of a second color. The second array substrate is provided with second pixel electrodes corresponding one-to-one to the second pixel units. The second opposing substrate is provided with an auxiliary electrode cooperating with the second pixel electrode. The second pixel electrode includes first sub-pixel electrode blocks and second sub-pixel electrode blocks that are independent of each other.

[0006] The present application also provides a reflective display device, comprising a liquid crystal box and an electronic ink screen stacked on the lower side of the liquid crystal box, wherein the liquid crystal box has a plurality of first pixel units distributed in an array, and the electronic ink screen has second pixel units corresponding to the first pixel units one by one; The liquid crystal box comprises a first opposing substrate, a first array substrate arranged opposite to the first opposing substrate, and a polymer dispersed liquid crystal layer located between the first opposing substrate and the first array substrate, wherein the polymer dispersed liquid crystal layer reflects light of a first color in a foggy state, the first array substrate is provided with first pixel electrodes corresponding to the first pixel units one by one, and the first opposing substrate is provided with a first common electrode matched with the first pixel electrode; The electronic ink screen includes a second opposing substrate, a second array substrate arranged opposite to the second opposing substrate, and ink capsules located between the second opposing substrate and the second array substrate. All of the ink capsules are provided with electrophoretic liquid and black ink particles and second color ink particles of opposite polarities. The second color ink particles are used to reflect light of a second color. The second array substrate is provided with second pixel electrodes corresponding one-to-one to the second pixel units. The second opposing substrate is provided with an auxiliary electrode cooperating with the second pixel electrode. The second pixel electrode includes first sub-pixel electrode blocks and second sub-pixel electrode blocks that are independent of each other.

[0007] Further, the first color and the second color are both white; Alternatively, the first color is a color, and the polymer dispersed liquid crystal layer includes polymer liquid crystal molecules and dye molecules of the first color that are mixed with each other.

[0008] Further, the second color is white; Alternatively, the second color is the same color as the first color; Alternatively, the second color is a color different from the first color.

[0009] Furthermore, the electrophoresis fluid is a transparent electrophoresis fluid; Alternatively, the electrophoretic fluid is an electrophoretic fluid of a third color, and the first color, the second color, and the third color are each one of red, green, and blue.

[0010] Furthermore, the auxiliary electrode is a second common electrode that entirely covers the second opposing substrate; Alternatively, the second opposing substrate is a third array substrate, the auxiliary electrode includes a plurality of third pixel electrodes distributed in an array, the third pixel electrodes correspond one-to-one to the second pixel units, the third pixel electrodes include a third sub-pixel electrode block and a fourth sub-pixel electrode block that are independent of each other, the third sub-pixel electrode block cooperates with the first sub-pixel electrode block, and the fourth sub-pixel electrode block cooperates with the second sub-pixel electrode block.

[0011] The present application also provides a control method for a reflective display device, which is used to drive the reflective display device as described above, wherein the electrophoretic liquid is a transparent electrophoretic liquid, and the second color is white. The control method comprises: When the pixel displays black, the cholesterol liquid crystal layer in the area corresponding to the pixel is controlled to be in a mist state or a transparent state, and all the black ink particles in the ink capsule in the area corresponding to the pixel are controlled to be concentrated on the upper side; When the pixel displays white, the cholesterol liquid crystal layer in the area corresponding to the pixel is controlled to be in a mist state or a transparent state, and all the second color ink particles in the ink capsule in the area corresponding to the pixel are controlled to be concentrated on the upper side and reflect the second color light; When the pixel displays gray, the cholesterol liquid crystal layer in the area corresponding to the pixel is controlled to be in a mist state or a transparent state, and part of the black ink particles and part of the second color ink particles in the ink capsule in the area corresponding to the pixel are controlled to be concentrated on the upper side; When the pixel is at the first color brightness, the cholesterol liquid crystal layer in the area corresponding to the pixel is controlled to be in a reflective state and reflect the light of the first color, and the black ink particles in all the ink capsules in the area corresponding to the pixel are controlled to be concentrated on the upper side; When the pixel is at the second color brightness, the cholesterol liquid crystal layer in the area corresponding to the pixel is controlled to be in a reflective state and reflect light of the first color, and part of the black ink particles and part of the second color ink particles in the ink capsule in the area corresponding to the pixel are controlled to be concentrated on the upper side.

[0012] The present application also provides a control method for a reflective display device, which is used to drive the reflective display device as described above, wherein the electrophoretic liquid is a transparent electrophoretic liquid, and the second color is the same color as the first color. The control method includes: When the pixel displays black, the cholesterol liquid crystal layer in the area corresponding to the pixel is controlled to be in a mist state or a transparent state, and all the black ink particles in the ink capsule in the area corresponding to the pixel are controlled to be concentrated on the upper side; When the pixel displays the first color brightness, the cholesterol liquid crystal layer in the area corresponding to the pixel is controlled to be in a reflective state and reflect the light of the first color, and the black ink particles in all the ink capsules in the area corresponding to the pixel are controlled to be concentrated on the upper side; When the pixel displays the second color brightness, the cholesterol liquid crystal layer in the area corresponding to the pixel is controlled to be in a reflective state and reflect the light of the first color, and part of the black ink particles and part of the second color ink particles in the ink capsule in the area corresponding to the pixel are controlled to be concentrated on the upper side; When the pixel displays the third color brightness, the cholesterol liquid crystal layer in the area corresponding to the pixel is controlled to be in a reflective state and reflect the light of the first color, and all the ink particles of the second color in the ink capsule in the area corresponding to the pixel are controlled to be concentrated on the upper side and reflect the light of the second color; When the pixel displays the fourth color brightness, the cholesterol liquid crystal layer in the area corresponding to the pixel is controlled to be in a mist state or a transparent state, and all the ink particles of the second color in the ink capsule in the area corresponding to the pixel are controlled to be concentrated on the upper side and reflect the light of the second color; When the pixel displays the fifth color brightness, the cholesterol liquid crystal layer in the area corresponding to the pixel is controlled to be in a misty state or a transparent state, and part of the black ink particles and part of the second color ink particles in the ink capsule in the area corresponding to the pixel are controlled to be concentrated on the upper side.

[0013] The present application also provides a control method for a reflective display device, which is used to drive the reflective display device as described above, wherein the electrophoretic liquid is an electrophoretic liquid of a third color, and the first color, the second color, and the third color are each one of red, green, and blue. The control method includes: When the pixel displays black, the cholesterol liquid crystal layer in the area corresponding to the pixel is controlled to be in a mist state or a transparent state, and all the black ink particles in the ink capsule in the area corresponding to the pixel are controlled to be concentrated on the upper side; When the pixel is in the first color, the cholesterol liquid crystal layer in the area corresponding to the pixel is controlled to be in a reflective state and reflect the light of the first color, and the black ink particles in all the ink capsules in the area corresponding to the pixel are controlled to be concentrated on the upper side; When the pixel is in the second color, the cholesterol liquid crystal layer in the area corresponding to the pixel is controlled to be in a mist state or a transparent state, and all the ink particles of the second color in the ink capsule in the area corresponding to the pixel are controlled to be concentrated on the upper side and reflect the light of the second color; When the pixel is in the third color, the cholesterol liquid crystal layer in the area corresponding to the pixel is controlled to be in a misty state or a transparent state, and all the black ink particles and all the second color ink particles in the ink capsule in the area corresponding to the pixel are controlled to be concentrated on the lower side.

[0014] The present application also provides a control method for a reflective display device, which is used to drive the reflective display device as described above, wherein the polymer dispersed liquid crystal layer includes polymer liquid crystal molecules and dye molecules of a first color that are mixed with each other, the electrophoretic liquid is an electrophoretic liquid of a third color, and the first color, the second color, and the third color are each one of red, green, and blue, and the control method includes: When the pixel displays black, the polymer dispersed liquid crystal layer in the area corresponding to the pixel is controlled to be in a transparent state, and all the black ink particles in the ink capsule in the area corresponding to the pixel are controlled to be concentrated on the upper side; When the pixel is in the first color, the polymer dispersed liquid crystal layer in the area corresponding to the pixel is controlled to be in a mist state and reflect the light of the first color, and the black ink particles in all the ink capsules in the area corresponding to the pixel are controlled to be concentrated on the upper side; When the pixel is in the second color, the polymer dispersed liquid crystal layer in the area corresponding to the pixel is controlled to be in a transparent state, and all the ink particles of the second color in the ink capsule in the area corresponding to the pixel are controlled to be concentrated on the upper side and reflect the light of the second color; When the pixel is in the third color, the polymer dispersed liquid crystal layer in the area corresponding to the pixel is controlled to be in a transparent state, and all the black ink particles and all the second color ink particles in the ink capsule in the area corresponding to the pixel are controlled to be concentrated on the lower side.

[0015] The beneficial effect of the present invention is that by setting an electronic ink screen under the cholesterol liquid crystal box and dividing the second pixel electrode of the electronic ink screen into mutually independent first sub-pixel electrode blocks and second sub-pixel electrode blocks, the electronic ink screen can control multiple brightnesses, so that the grayscale brightness of the cholesterol liquid crystal box is richer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 1 is a schematic structural diagram of the reflective display device in the initial state in the first embodiment of the present invention.

[0017] Figure 2 It is a schematic diagram of the planar structure of the first array substrate in the first embodiment of the present invention.

[0018] Figure 3 It is a schematic diagram of the planar structure of the second array substrate in the first embodiment of the present invention.

[0019] Figure 4 It is a schematic diagram of the principle of the three-state transformation of cholesterol liquid crystal in Example 1 of the present invention.

[0020] Figure 5 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.

[0021] Figure 6 It is a schematic structural diagram of the reflective display device in the first embodiment of the present invention when reflecting the first color light.

[0022] Figure 7 Schematic diagram of the structure of the reflective display device in the black state in the first embodiment of the present invention.

[0023] Figure 8 1 is a schematic diagram of the structure of the reflective display device in the first embodiment of the present invention when displaying white.

[0024] Fig. 9 It is a schematic structural diagram of the reflective display device in the first embodiment of the present invention when displaying gray.

[0025] Fig.10 It is a schematic diagram of the structure of the reflective display device in the first embodiment of the present invention when displaying a color picture.

[0026] Fig.11 It is a schematic diagram of the structure of the reflective display device in the first embodiment of the present invention when displaying a color image and a black and white image.

[0027] Fig.12 This is one of the structural schematic diagrams of the reflective display device in the initial state in the second embodiment of the present invention.

[0028] Fig.13This is the second structural schematic diagram of the reflective display device in the initial state in the second embodiment of the present invention.

[0029] Fig.14 It is a schematic diagram of the planar structure of the third array substrate in the second embodiment of the present invention.

[0030] Fig.15 It is a schematic structural diagram of the reflective display device in the initial state in the third embodiment of the present invention.

[0031] Fig.16 It is a schematic structural diagram of the reflective display device in Embodiment 3 of the present invention when displaying red.

[0032] Fig.17 It is a schematic structural diagram of the reflective display device in the initial state in the fourth embodiment of the present invention.

[0033] Fig.18 It is a schematic diagram of the structure of the reflective display device in the fourth embodiment of the present invention when displaying a color picture.

[0034] Fig.19 It is a schematic structural diagram of the reflective display device in the initial state in the fifth embodiment of the present invention.

[0035] Fig. 20 It is a schematic diagram of the structure of the reflective display device in the fifth embodiment of the present invention when the screen is black and white.

[0036] Fig.21 It is a schematic structural diagram of the reflective display device in the initial state in the sixth embodiment of the present invention.

[0037] Fig. 22 It is a schematic diagram of the structure of the reflective display device in the sixth embodiment of the present invention when displaying a color picture. DETAILED DESCRIPTION

[0038] 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 control method proposed by the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments: [Example 1] Figure 1 1 is a schematic structural diagram of the reflective display device in the initial state in the first embodiment of the present invention. Figure 2 It is a schematic diagram of the planar structure of the first array substrate in the first embodiment of the present invention. Figure 3 It is a schematic diagram of the planar structure of the second array substrate in the first embodiment of the present invention.

[0039] like Figures 1 to 3As shown, a reflective display device provided by Embodiment 1 of the present invention includes a liquid crystal box 10 and an electronic ink screen 20 stacked on the lower side of the liquid crystal box 10, wherein the side of the reflective display device close to the ambient light is the upper side, and the side away from the ambient light is the lower side, that is, the liquid crystal box 10 is located on the side of the electronic ink screen 20 close to the ambient light. The liquid crystal box 10 has a plurality of first pixel units P1 distributed in an array, and the electronic ink screen 20 has a plurality of second pixel units P2 distributed in an array, and the first pixel units P1 correspond to the second pixel units P2 one by one.

[0040] The liquid crystal box 10 includes a first opposing substrate 11, a first array substrate 12 arranged opposite to the first opposing substrate 11, and a cholesterol liquid crystal layer 13 located between the first opposing substrate 11 and the first array substrate 12, and all the cholesterol liquid crystal layers 13 reflect light of the first color in the reflection state. In this embodiment, the first opposing substrate 11 is located on the side of the liquid crystal box 10 close to the external environment, and the first array substrate 12 is located on the side of the liquid crystal box 10 close to the electronic ink screen 20. The first array substrate 12 is provided with a first pixel electrode 121 corresponding to the first pixel unit P1, and the first common electrode 111 matched with the first pixel electrode 121 is provided on the first opposing substrate 11. The first pixel electrode 121 is a block electrode corresponding to the first pixel unit P1, and the first common electrode 111 is a planar electrode covering the entire surface of the first opposing substrate 11.

[0041] Among them, the cholesterol liquid crystal in the cholesterol liquid crystal layer 13 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.

[0042] Figure 4 Schematic diagram of the principle of the three-state transformation of cholesterol liquid crystal in the first embodiment of the present invention. Figure 5 Schematic diagram of the driving signal for the three-state transformation of cholesterol liquid crystal in the first embodiment of the present invention. Figure 4 and Figure 5As shown, a common voltage signal Vcom is applied to the first common electrode 111, and a first electric signal V1 is continuously applied to the first pixel electrode 121, a voltage difference (for example, 16V) is formed between the common voltage signal Vcom and the first electric signal V1, a strong vertical electric field is formed between the first common electrode 111 and the first pixel electrode 121, and the cholesterol liquid crystal in the cholesterol liquid crystal layer 13 rotates and stagnates in the H state (transparent state); a common voltage signal Vcom is applied to the first common electrode 111, and a second electric signal V2 is applied to the first pixel electrode 121, a voltage difference (for example, 16V) is formed 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 first common electrode 111 and the first pixel electrode 121, and then the vertical electric field disappears slowly, so that the cholesterol liquid crystal in the cholesterol liquid crystal layer 13 rotates and stops in the FC state, which is a scattering state and has a light-scattering effect; a common voltage signal Vcom is applied to the first common electrode 111, and a third electric signal V3 is applied to the first pixel electrode 121. There is a voltage difference (for example, 16V) 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 first common electrode 111 and the first pixel electrode 121, and then the vertical electric field disappears quickly, so that the cholesterol liquid crystal in the cholesterol liquid crystal layer 13 rotates and stops in the P state, which is a reflection 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. The reflection spectrum band (Δλ) of cholesterol liquid crystal is proportional to the helical pitch (Po) and birefringence (Δn=ne-no) of cholesterol liquid crystal, and the formula is: Δλ=PoΔn. Therefore, cholesterol liquid crystals with different helical pitches can reflect light of different colors in the reflection state. P state and FC state do not require voltage to maintain.

[0043] like Figure 2As shown, a plurality of first scan lines 101, a plurality of first data lines 102 and a plurality of first thin film transistors 103 are provided on the first array substrate 12, and a first pixel electrode 121 and a first thin film transistor 103 are provided in a region corresponding to each first pixel unit P1 of the first array substrate 12. The first pixel electrode 121 is electrically connected to the first scan line 101 and the first data line 102 adjacent to the first thin film transistor 103 through the first thin film transistor 103. The first thin film transistor 103 includes a first gate, a first active layer, a first drain and a first source, the first gate and the first scan line 101 are located in the same layer and are electrically connected, the first gate and the first active layer are separated by an insulating layer, the first source is electrically connected to the first data line 102, and the first drain is electrically connected to the first pixel electrode 121 through a contact hole.

[0044] The electronic ink screen 20 includes a second opposing substrate 21, a second array substrate 22 arranged opposite to the second opposing substrate 21, and an ink capsule 23 located between the second opposing substrate 21 and the second array substrate 22. All ink capsules 23 are provided with an electrophoretic liquid 233 and black ink particles 231 and second color ink particles 232 of opposite polarity. The second color ink particles 232 are used to reflect light of the second color. In this embodiment, the second opposing substrate 21 is located on the side of the electronic ink screen 20 close to the liquid crystal box 10, and the second array substrate 22 is located on the side of the electronic ink screen 20 away from the liquid crystal box 10. By providing electric fields in different directions to the ink capsules 23, the black ink particles 231 and the second color ink particles 232 can move in corresponding directions. For example, the black ink particles 231 are negatively charged and the second color ink particles 232 are positively charged, so that the second color ink particles 232 move in the direction of the electric field and the black ink particles 231 move in the opposite direction of the electric field. If an electric field is provided in the upward direction, the second color ink particles 232 move in the upward direction and the black ink particles 231 move in the downward direction; if an electric field is provided in the downward direction, the second color ink particles 232 move in the downward direction and the black ink particles 231 move in the upward direction. Of course, the black ink particles 231 may be positively charged and the second color ink particles 232 may be negatively charged, so that the black ink particles 231 move in the direction of the electric field and the second color ink particles 232 move in the opposite direction of the electric field.

[0045] The second array substrate 22 is provided with a second pixel electrode 221 corresponding to the second pixel unit P2, and the second opposing substrate 21 is provided with an auxiliary electrode 211 matched with the second pixel electrode 221. The second pixel electrode 221 includes a first sub-pixel electrode block 221a and a second sub-pixel electrode block 221b that are independent of each other. In this embodiment, the auxiliary electrode 211 is a second common electrode that covers the entire surface of the second opposing substrate 21. By controlling the voltage polarity on the second pixel electrode 221, the direction of the electric field between the second pixel electrode 221 and the auxiliary electrode 211 is controlled, so as to control the ink capsule 23 to switch between the black state (light absorption state) and the second color state. For example, a 0V common voltage is applied to the auxiliary electrode 211. If a positive voltage is applied to the second pixel electrode 221, the direction of the electric field between the second pixel electrode 221 and the auxiliary electrode 211 is directed to the upward direction; if a negative voltage is applied to the second pixel electrode 221, the direction of the electric field between the second pixel electrode 221 and the auxiliary electrode 211 is directed to the downward direction.

[0046] like Figure 3 As shown, a plurality of second scan lines 201, a plurality of second data lines 202, a plurality of second thin film transistors 203 and a plurality of third thin film transistors 204 are provided on the second array substrate 22, and a second pixel electrode 221 and two second thin film transistors 203 are provided in the area corresponding to each second pixel unit P2 of the second array substrate 22. The first sub-pixel electrode block 221a and the second sub-pixel electrode block 221b are each electrically connected to the second scan line 201 and the second data line 202 adjacent to the second thin film transistor 203 through a second thin film transistor 203, and the first sub-pixel electrode block 221a and the second sub-pixel electrode block 221b are independent of each other and are individually applied with corresponding voltages through the second scan line 201, the second data line 202, the second thin film transistor 203 and the third thin film transistor 204. The second thin film transistor 203 includes a second gate, a second active layer, a second drain and a second source. The second gate is located in the same layer as the second scan line 201 and is electrically connected. The second gate is separated from the second active layer by an insulating layer. The second source is electrically connected to the second data line 202. The second drain is electrically connected to the first sub-pixel electrode block 221a through a contact hole. The third thin film transistor 204 includes a third gate, a third active layer, a third drain and a third source. The third gate is located in the same layer as the second scan line 201 and is electrically connected. The third gate is separated from the third active layer by an insulating layer. The third source is electrically connected to the second data line 202. The third drain is electrically connected to the second sub-pixel electrode block 221ba through a contact hole.

[0047] The first counter substrate 11, the first array substrate 12, the second counter substrate 21 and the second array substrate 22 may be made of transparent substrates such as glass, acrylic and polycarbonate. The first common electrode 111, the first pixel electrode 121, the second common electrode 221 and the second pixel electrode 222 may be made of transparent electrodes such as indium tin oxide (ITO) or indium zinc oxide (IZO).

[0048] In this embodiment, the second color is white, that is, the second color ink particles 232 are white ink particles, so that they can reflect white light. The electrophoretic liquid 233 is a transparent electrophoretic liquid, and light can directly pass through the electrophoretic liquid 233. The first color is red, that is, the cholesterol liquid crystal layer 13 reflects red light in the reflection state. Of course, other colors of light can also be reflected in the reflection state by changing the pitch of the cholesterol liquid crystal layer 13.

[0049] This embodiment also provides a control method for driving the reflective display device as described above. The following is an example in which the black ink particles 231 are negatively charged and the second color ink particles (white) 232 are positively charged. The control method includes: Figure 6 Schematic diagram of the structure of the reflective display device in the first embodiment of the present invention when reflecting the first color light. Figure 6 As shown, when the pixel is at the first color brightness, the cholesterol liquid crystal layer 13 in the area corresponding to the pixel is controlled to be in a reflective state and reflect the light of the first color, and the black ink particles 231 in all the ink capsules 23 in the area corresponding to the pixel are controlled to be concentrated on the upper side. At this time, the pixel presents the first color (red of the first brightness). Specifically, the common voltage signal Vcom is applied to the first common electrode 111, and the third electrical signal V3 ( Figure 5), there is a voltage difference (for example, 16V) between the third electrical signal V3 and the common voltage signal Vcom, and the third electrical 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 electrical 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 first common electrode 111 and the first pixel electrode 121, and then the vertical electric field disappears quickly, so that the cholesterol liquid crystal in the cholesterol liquid crystal layer 13 rotates and stagnates in the P state, which is a reflective state and reflects the light of the first color (red). A common voltage of 0V is applied to the auxiliary electrode 211, and a negative voltage (for example, -15V) is applied to the second pixel electrode 221, that is, a negative voltage (for example, -15V) is applied to both the first sub-pixel electrode block 221a and the second sub-pixel electrode block 221b. Then, the electric field direction between the second pixel electrode 221 and the auxiliary electrode 211 is downward, and the second color ink particles 232 move downward, and the black ink particles 231 move upward and concentrate on the side close to the auxiliary electrode 211. Other light passing through the liquid crystal box 10 is absorbed by the black ink particles 231, so that the pixel presents the first color with a first brightness.

[0050] When the pixel is at the second color brightness, the cholesterol liquid crystal layer 13 in the area corresponding to the pixel is controlled to be in a reflective state and reflect the light of the first color, and part of the black ink particles 231 and part of the second color ink particles 232 in the ink capsule 23 in the area corresponding to the pixel are controlled to be concentrated on the upper side. At this time, the pixel presents the first color (red of the second brightness). Specifically, the common voltage signal Vcom is applied to the first common electrode 111, and the third electrical signal V3 ( Figure 5), there is a voltage difference (for example, 16V) between the third electrical signal V3 and the common voltage signal Vcom, and the third electrical 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 electrical 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 first common electrode 111 and the first pixel electrode 121, and then the vertical electric field disappears quickly, so that the cholesterol liquid crystal in the cholesterol liquid crystal layer 13 rotates and stagnates in the P state, which is a reflective state and reflects the light of the first color (red). A common voltage of 0V is applied to the auxiliary electrode 211, a negative voltage (for example, -5V) is applied to the first sub-pixel electrode block 221a, and a positive voltage (for example, +5V) is applied to the second sub-pixel electrode block 221b. Then, the electric field direction between the first sub-pixel electrode block 221a and the auxiliary electrode 211 is downward, and the electric field direction between the second sub-pixel electrode block 221b and the auxiliary electrode 211 is upward. Then, part of the second color ink particles 232 move upward and concentrate on the side close to the auxiliary electrode 211, and part of the black ink particles 231 move upward and concentrate on the side close to the auxiliary electrode 211, so that part of the black ink particles 231 and part of the second color ink particles 232 are concentrated on the upper side, and part of the other light passing through the liquid crystal box 10 is absorbed by the black ink particles 231, and the other part of the light is reflected back by the second color ink particles 232, so that the pixel presents the first color with a second brightness.

[0051] Figure 7 Schematic diagram of the structure of the reflective display device in the black state in the first embodiment of the present invention. Figure 7 As shown, when the pixel displays black, the cholesterol liquid crystal layer 13 in the area corresponding to the pixel is controlled to be in a mist state or a transparent state, and all the black ink particles 231 in the ink capsule 23 in the area corresponding to the pixel are controlled to be concentrated on the upper side, and the light passing through the liquid crystal box 10 is absorbed by the black ink particles 231, and the pixel appears black at this time. Specifically, as Figure 7 Shown and referenced Figure 5, a common voltage signal Vcom is applied to the first common electrode 111, and a second electric signal V2 is applied to the first pixel electrode 121. There is a voltage difference (e.g., 16V) 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 first common electrode 111 and the first pixel electrode 121, and then the vertical electric field slowly disappears, so that the cholesterol liquid crystal in the cholesterol liquid crystal layer 13 rotates and stagnates in the FC state, which is a scattering state and has a light-scattering effect. A common voltage of 0V is applied to the auxiliary electrode 211, and a negative voltage (for example, -15V) is applied to the second pixel electrode 221, that is, a negative voltage (for example, -15V) is applied to both the first sub-pixel electrode block 221a and the second sub-pixel electrode block 221b. Then, the electric field direction between the second pixel electrode 221 and the auxiliary electrode 211 is downward, and the second color ink particles 232 move downward, and the black ink particles 231 move upward and concentrate on the side close to the auxiliary electrode 211. The light passing through the liquid crystal box 10 is absorbed by the black ink particles 231, thereby appearing black (foggy black). Of course, a common voltage signal Vcom can also be applied to the first common electrode 111, and the first electrical signal V1 can be continuously applied to the first pixel electrode 121. There is a voltage difference (for example, 16V) between the common voltage signal Vcom and the first electrical signal V1. A strong vertical electric field will be formed between the first common electrode 111 and the first pixel electrode 121. The cholesterol liquid crystal in the cholesterol liquid crystal layer 13 rotates and stagnates in the H state (transparent state). The light passing through the liquid crystal box 10 is absorbed by the black ink particles 231, and the pixel will also appear black (bright black).

[0052] Figure 8 Schematic diagram of the structure of the reflective display device in the first embodiment of the present invention when displaying white. Figure 8 As shown, when the pixel displays white, the cholesterol liquid crystal layer 13 in the area corresponding to the pixel is controlled to be in a mist state or a transparent state, and all the second color ink particles (white) 232 in the ink capsule 23 in the area corresponding to the pixel are controlled to be concentrated on the upper side and reflect the second color light. The light passing through the liquid crystal box 10 is reflected back by the second color ink particles 232, and the pixel appears white at this time. Figure 8 Shown and referenced Figure 5, a common voltage signal Vcom is applied to the first common electrode 111, and a second electric signal V2 is applied to the first pixel electrode 121. There is a voltage difference (e.g., 16V) 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 first common electrode 111 and the first pixel electrode 121, and then the vertical electric field slowly disappears, so that the cholesterol liquid crystal in the cholesterol liquid crystal layer 13 rotates and stagnates in the FC state, which is a scattering state and has a light-scattering effect. A common voltage of 0V is applied to the auxiliary electrode 211, and a positive voltage (for example, +15V) is applied to the second pixel electrode 221, that is, a positive voltage (for example, +15V) is applied to both the first sub-pixel electrode block 221a and the second sub-pixel electrode block 221b. Then, the electric field direction between the second pixel electrode 221 and the auxiliary electrode 211 is upward, and the black ink particles 231 move downward, and the second color ink particles 232 move upward and concentrate on the side close to the auxiliary electrode 211. Other light passing through the liquid crystal box 10 is reflected back by the second color ink particles 232, thereby appearing white (foggy white). Of course, a common voltage signal Vcom can also be applied to the first common electrode 111, and the first electrical signal V1 can be continuously applied to the first pixel electrode 121. There is a voltage difference (for example, 16V) between the common voltage signal Vcom and the first electrical signal V1. A strong vertical electric field will be formed between the first common electrode 111 and the first pixel electrode 121. The cholesterol liquid crystal in the cholesterol liquid crystal layer 13 rotates and stagnates in the H state (transparent state). The light passing through the liquid crystal box 10 is absorbed by the black ink particles 231, and the pixel will also appear white (bright white).

[0053] Fig. 9 Schematic diagram of the structure of the reflective display device in the first embodiment of the present invention when displaying gray. Fig. 9 As shown, when the pixel displays gray, the cholesterol liquid crystal layer 13 in the area corresponding to the pixel is controlled to be in a mist state or a transparent state, and part of the black ink particles 231 and part of the second color ink particles 232 in the ink capsule 23 in the area corresponding to the pixel are controlled to be concentrated on the upper side, and part of the other light passing through the liquid crystal box 10 is absorbed by the black ink particles 231, and the other part of the light is reflected back by the second color ink particles 232, so that the pixel appears gray. Fig. 9 Shown and referenced Figure 5, a common voltage signal Vcom is applied to the first common electrode 111, and a second electric signal V2 is applied to the first pixel electrode 121. There is a voltage difference (e.g., 16V) 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 first common electrode 111 and the first pixel electrode 121, and then the vertical electric field slowly disappears, so that the cholesterol liquid crystal in the cholesterol liquid crystal layer 13 rotates and stagnates in the FC state, which is a scattering state and has a light-scattering effect. A common voltage of 0V is applied to the auxiliary electrode 211, a negative voltage (for example, -5V) is applied to the first sub-pixel electrode block 221a, and a positive voltage (for example, +5V) is applied to the second sub-pixel electrode block 221b. The electric field direction between the first sub-pixel electrode block 221a and the auxiliary electrode 211 is downward, and the electric field direction between the second sub-pixel electrode block 221b and the auxiliary electrode 211 is upward. Then, part of the second color ink particles 232 move upward and concentrate on the side close to the auxiliary electrode 211, and part of the black ink particles 231 move upward and concentrate on the side close to the auxiliary electrode 211, so that part of the black ink particles 231 and part of the second color ink particles 232 are concentrated on the upper side, and part of the other light passing through the liquid crystal box 10 is absorbed by the black ink particles 231, and the other part of the light is reflected back by the second color ink particles 232, so that the pixel appears gray (foggy gray). Of course, a common voltage signal Vcom can also be applied to the first common electrode 111, and a first electrical signal V1 can be continuously applied to the first pixel electrode 121. There is a voltage difference (for example, 16V) between the common voltage signal Vcom and the first electrical signal V1. A strong vertical electric field will be formed between the first common electrode 111 and the first pixel electrode 121. The cholesterol liquid crystal in the cholesterol liquid crystal layer 13 rotates and stagnates in the H state (transparent state). The light passing through the liquid crystal box 10 is absorbed by the black ink particles 231, and the pixel will also appear white (bright gray).

[0054] Fig.10 Schematic diagram of the structure of the reflective display device in the first embodiment of the present invention when displaying a color image. Fig.10 As shown, when the reflective display device displays a color picture (red, black, white, gray), it only needs to control the corresponding pixels to display the corresponding colors, so that the reflective display device can display pictures of multiple colors. Of course, in another embodiment, Fig.11 1 is a schematic diagram of the structure of the reflective display device in the first embodiment of the present invention when displaying a color image and a black and white image. Fig.11As shown, the second array substrate 22 in the present application adopts a transparent substrate. Therefore, the reflective display device in the present application can also realize double-sided display, wherein the side close to the liquid crystal box 10 can display a color picture (red, black, white, gray), and the side close to the electronic ink screen 20 can display a black, white and gray picture. The pictures displayed on both sides are basically the same, but the colors are different.

[0055] [Example 2] Fig.12 This is one of the structural schematic diagrams of the reflective display device in the initial state in the second embodiment of the present invention. Fig.13 This is the second structural schematic diagram of the reflective display device in the initial state in the second embodiment of the present invention. Fig.14 FIG. 1 is a schematic diagram of the planar structure of the third array substrate in the second embodiment of the present invention. Figure 12 to Figure 14 As shown, the reflective display device and control method provided in the second embodiment of the present invention are the same as those in the first embodiment ( Figures 1 to 11 ) are basically the same, except that: In this embodiment, if Fig.12 As shown, the second array substrate 22 is located on the side of the electronic ink screen 20 close to the liquid crystal box 10, and the second opposing substrate 21 is located on the side of the electronic ink screen 20 away from the liquid crystal box 10. This allows the second pixel electrode 221 to more easily control the black ink particles 231 and the second color ink particles 232 to move toward the second pixel electrode 221, so that the reflective display device has better effects in gray display, second color brightness display and double-sided display.

[0056] In another embodiment, if Fig.13 and Fig.14As shown, the second opposing substrate 21 is a third array substrate, the auxiliary electrode 211 includes a plurality of third pixel electrodes distributed in an array, the third pixel electrodes correspond to the second pixel units P2 one by one, the third pixel electrodes include a third sub-pixel electrode block 211a and a fourth sub-pixel electrode block 211b that are independent of each other, the third sub-pixel electrode block 211a cooperates with the first sub-pixel electrode block 221a, and the fourth sub-pixel electrode block 211b cooperates with the second sub-pixel electrode block 221b. Among them, the projections of the first sub-pixel electrode block 221a and the third sub-pixel electrode block 211a on the third array substrate overlap with each other, and the projections of the second sub-pixel electrode block 221b and the fourth sub-pixel electrode block 211b on the third array substrate overlap with each other. Optionally, the first sub-pixel electrode block 221a and the second sub-pixel electrode block 221b have the same area, and the third sub-pixel electrode block 211a and the fourth sub-pixel electrode block 211b have the same area. The first sub-pixel electrode block 221a and the second sub-pixel electrode block 221b are arranged in the row direction, and the third sub-pixel electrode block 211a and the fourth sub-pixel electrode block 211b are arranged in the row direction; or the first sub-pixel electrode block 221a and the second sub-pixel electrode block 221b can also be arranged in the column direction, and the third sub-pixel electrode block 211a and the fourth sub-pixel electrode block 211b can also be arranged in the column direction. Thus, the second pixel electrode 221 and the third pixel electrode can better control the movement of the black ink particles 231 and the second color ink particles 232, thereby improving the display effect.

[0057] Further, such as Fig.14As shown, a plurality of third scan lines 205, a plurality of third data lines 206, a plurality of fourth thin film transistors 207 and a plurality of fifth thin film transistors 208 are provided on the third array substrate, and a second pixel electrode 221 and two fourth thin film transistors 207 are provided in the region corresponding to each second pixel unit P2 on the third array substrate. The third sub-pixel electrode block 211a and the fourth sub-pixel electrode block 211b are each electrically connected to the third scan line 205 and the third data line 206 adjacent to the fourth thin film transistor 207 through a fourth thin film transistor 207, and the third scan line 205, the third data line 206, the fourth thin film transistor 207 and the fifth thin film transistor 208 are used to realize that the third sub-pixel electrode block 211a and the fourth sub-pixel electrode block 211b are independent of each other and are individually applied with corresponding voltages. The fourth thin film transistor 207 includes a fourth gate, a fourth active layer, a fourth drain and a fourth source. The fourth gate is located in the same layer as the third scan line 205 and is electrically connected. The fourth gate is separated from the fourth active layer by an insulating layer. The fourth source is electrically connected to the third data line 206. The fourth drain is electrically connected to the third sub-pixel electrode block 211a through a contact hole. The fifth thin film transistor 208 includes a fifth gate, a fifth active layer, a fifth drain and a fifth source. The fifth gate is located in the same layer as the third scan line 205 and is electrically connected. The fifth gate is separated from the fifth active layer by an insulating layer. The fifth source is electrically connected to the third data line 206. The fifth drain is electrically connected to the fourth sub-pixel electrode block 211b through a contact hole.

[0058] 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.

[0059] [Example 3] Fig.15 It is a schematic structural diagram of the reflective display device in the initial state in the third embodiment of the present invention. Fig.16 Schematic diagram of the structure of the reflective display device in the third embodiment of the present invention when displaying red. Fig.15 and Fig.16 As shown, the reflective display device and control method provided in the third embodiment of the present invention are the same as those in the first embodiment ( Figures 1 to 11 )、Example 2 ( Figure 12 to Figure 14 ) are basically the same, except that: In this embodiment, the second color is the same color as the first color, that is, in this embodiment, the first color and the second color are both red, the cholesterol liquid crystal layer 13 reflects red light in the reflective state, and the second color ink particles 232 are red ink particles. Therefore, when the reflective display device displays the second color, the chromaticity of the second color is better.

[0060] This embodiment also provides a control method for driving the reflective display device as described above. The following is an example in which the black ink particles 231 are negatively charged and the second color ink particles (red) 232 are positively charged. The control method includes: When the pixel displays black, the cholesterol liquid crystal layer 13 in the area corresponding to the pixel is controlled to be in a misty or transparent state, and all the black ink particles 231 in the ink capsule 23 in the area corresponding to the pixel are controlled to be concentrated on the upper side. The light passing through the liquid crystal box 10 is absorbed by the black ink particles 231, and the pixel appears black at this time.

[0061] like Fig.16 For the first pixel in the image (from left to right), when the pixel displays the first color brightness, the cholesterol liquid crystal layer 13 in the corresponding area of ​​the pixel is controlled to be in a reflective state and reflect the light of the first color, and the black ink particles 231 in all the ink capsules 23 in the corresponding area of ​​the pixel are controlled to be concentrated on the upper side. At this time, the pixel presents the first color (red of the first brightness). Specifically, the common voltage signal Vcom is applied to the first common electrode 111, and the third electrical signal V3 ( Figure 5 ), there is a voltage difference (for example, 16V) between the third electrical signal V3 and the common voltage signal Vcom, and the third electrical 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 electrical 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 first common electrode 111 and the first pixel electrode 121, and then the vertical electric field disappears quickly, so that the cholesterol liquid crystal in the cholesterol liquid crystal layer 13 rotates and stagnates in the P state, which is a reflective state and reflects the light of the first color (red). A common voltage of 0V is applied to the auxiliary electrode 211, and a negative voltage (for example, -15V) is applied to the second pixel electrode 221, that is, a negative voltage (for example, -15V) is applied to both the first sub-pixel electrode block 221a and the second sub-pixel electrode block 221b. Then, the electric field direction between the second pixel electrode 221 and the auxiliary electrode 211 is downward, and the second color ink particles 232 move downward, and the black ink particles 231 move upward and concentrate on the side close to the auxiliary electrode 211. Other light passing through the liquid crystal box 10 is absorbed by the black ink particles 231, so that the pixel presents the first color with a first brightness.

[0062] like Fig.16For the second pixel in the image (from left to right), when the pixel displays the second color brightness, the cholesterol liquid crystal layer 13 in the corresponding area of ​​the pixel is controlled to be in a reflective state and reflect the light of the first color, and part of the black ink particles 231 and part of the second color ink particles 232 in the ink capsule 23 in the corresponding area of ​​the pixel are controlled to be concentrated on the upper side. At this time, the pixel presents the first color (red of the second brightness). Specifically, the common voltage signal Vcom is applied to the first common electrode 111, and the third electrical signal V3 ( Figure 5 ), there is a voltage difference (for example, 16V) between the third electrical signal V3 and the common voltage signal Vcom, and the third electrical 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 electrical 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 first common electrode 111 and the first pixel electrode 121, and then the vertical electric field disappears quickly, so that the cholesterol liquid crystal in the cholesterol liquid crystal layer 13 rotates and stagnates in the P state, which is a reflective state and reflects the light of the first color (red). A common voltage of 0V is applied to the auxiliary electrode 211, a negative voltage (for example, -5V) is applied to the first sub-pixel electrode block 221a, and a positive voltage (for example, +5V) is applied to the second sub-pixel electrode block 221b. The electric field direction between the first sub-pixel electrode block 221a and the auxiliary electrode 211 is downward, and the electric field direction between the second sub-pixel electrode block 221b and the auxiliary electrode 211 is upward. Then, part of the second color ink particles 232 move upward and concentrate on the side close to the auxiliary electrode 211, and part of the black ink particles 231 move upward and concentrate on the side close to the auxiliary electrode 211, so that part of the black ink particles 231 and part of the second color ink particles 232 are concentrated on the upper side. Since the cholesterol liquid crystal in the reflective state cannot completely reflect the red light, part of the red light passing through the liquid crystal box 10 is absorbed by the black ink particles 231, and the other part is reflected back by the second color ink particles 232, so that the pixel presents the first color of the second brightness.

[0063] like Fig.16 For the third pixel (from left to right), when the pixel displays the third color brightness, the cholesterol liquid crystal layer 13 in the corresponding area of ​​the pixel is controlled to be in a reflective state and reflect the light of the first color, and all the second color ink particles 232 in the ink capsule 23 in the corresponding area of ​​the pixel are controlled to be concentrated on the upper side and reflect the light of the second color. At this time, the pixel presents the first color (red of the third brightness). Specifically, the common voltage signal Vcom is applied to the first common electrode 111, and the third electrical signal V3 ( Figure 5), there is a voltage difference (for example, 16V) between the third electrical signal V3 and the common voltage signal Vcom, and the third electrical 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 electrical 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 first common electrode 111 and the first pixel electrode 121, and then the vertical electric field disappears quickly, so that the cholesterol liquid crystal in the cholesterol liquid crystal layer 13 rotates and stagnates in the P state, which is a reflective state and reflects the light of the first color (red). A common voltage of 0V is applied to the auxiliary electrode 211, and a positive voltage (for example, +15V) is applied to the second pixel electrode 221, that is, a positive voltage (for example, +15V) is applied to both the first sub-pixel electrode block 221a and the second sub-pixel electrode block 221b. The electric field direction between the second pixel electrode 221 and the auxiliary electrode 211 is upward, and the black ink particles 231 move downward, and the second color ink particles 232 move upward and concentrate on the side close to the auxiliary electrode 211. Since the cholesterol liquid crystal in the reflective state cannot completely reflect the red light, the red light passing through the liquid crystal box 10 is reflected back by the second color ink particles 232, so that the pixel presents the first color of the third brightness.

[0064] like Fig.16, when the pixel displays the fourth color brightness, the cholesterol liquid crystal layer 13 in the corresponding area of ​​the pixel is controlled to be in a mist state or a transparent state, and all the second color ink particles 232 in the ink capsule 23 in the corresponding area of ​​the pixel are controlled to be concentrated on the upper side and reflect the light of the second color. At this time, the pixel presents the first color (red of the fourth brightness). Specifically, a common voltage signal Vcom is applied to the first common electrode 111, and a second electric signal V2 is applied to the first pixel electrode 121. There is a voltage difference (for example, 16V) 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 first common electrode 111 and the first pixel electrode 121, and then the vertical electric field slowly disappears, so that the cholesterol liquid crystal in the cholesterol liquid crystal layer 13 rotates and stagnates in the FC state, which is a scattering state and has a light-scattering effect. A common voltage of 0V is applied to the auxiliary electrode 211, and a positive voltage (for example, +15V) is applied to the second pixel electrode 221, that is, a positive voltage (for example, +15V) is applied to both the first sub-pixel electrode block 221a and the second sub-pixel electrode block 221b. The electric field direction between the second pixel electrode 221 and the auxiliary electrode 211 is upward, and the black ink particles 231 move downward, and the second color ink particles 232 move upward and concentrate on the side close to the auxiliary electrode 211. The red light passing through the liquid crystal box 10 is reflected back by the second color ink particles 232, so that the pixel presents the first color (fog red) of the fourth brightness. Of course, a common voltage signal Vcom can also be applied to the first common electrode 111, and the first electrical signal V1 can be continuously applied to the first pixel electrode 121. There is a voltage difference (for example, 16V) between the common voltage signal Vcom and the first electrical signal V1. A strong vertical electric field will be formed between the first common electrode 111 and the first pixel electrode 121. The cholesterol liquid crystal in the cholesterol liquid crystal layer 13 rotates and stagnates in the H state (transparent state). The red light passing through the liquid crystal box 10 is reflected back by the second color ink particles 232. At this time, the pixel will also appear red (bright red).

[0065] When the pixel displays the fifth color brightness, the cholesterol liquid crystal layer 13 in the area corresponding to the pixel is controlled to be in a mist state or a transparent state, and part of the black ink particles 231 and part of the second color ink particles 232 in the ink capsule 23 in the area corresponding to the pixel are controlled to be concentrated on the upper side, and the pixel presents the first color (red of the fifth brightness). Specifically, a common voltage signal Vcom is applied to the first common electrode 111, and a second electric signal V2 is applied to the first pixel electrode 121. There is a voltage difference (for example, 16V) 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 first common electrode 111 and the first pixel electrode 121, and then the vertical electric field slowly disappears, so that the cholesterol liquid crystal in the cholesterol liquid crystal layer 13 rotates and stagnates in the FC state, which is a scattering state and has a light-scattering effect. A common voltage of 0V is applied to the auxiliary electrode 211, a negative voltage (for example, -5V) is applied to the first sub-pixel electrode block 221a, and a positive voltage (for example, +5V) is applied to the second sub-pixel electrode block 221b. The electric field direction between the first sub-pixel electrode block 221a and the auxiliary electrode 211 is downward, and the electric field direction between the second sub-pixel electrode block 221b and the auxiliary electrode 211 is upward. Some of the second color ink particles 232 move upward and concentrate on the side close to the auxiliary electrode 211, and some of the black ink particles 231 move upward and concentrate on the side close to the auxiliary electrode 211, so that some of the black ink particles 231 and some of the second color ink particles 232 are concentrated on the upper side, and part of the red light passing through the liquid crystal box 10 is absorbed by the black ink particles 231, and the other part of the red light is reflected back by the second color ink particles 232, so that the pixel presents the first color (foggy red) of the fifth brightness. Of course, a common voltage signal Vcom can also be applied to the first common electrode 111, and the first electrical signal V1 can be continuously applied to the first pixel electrode 121. There is a voltage difference (for example, 16V) between the common voltage signal Vcom and the first electrical signal V1. A strong vertical electric field will be formed between the first common electrode 111 and the first pixel electrode 121. The cholesterol liquid crystal in the cholesterol liquid crystal layer 13 rotates and stagnates in the H state (transparent state). The red light passing through the liquid crystal box 10 is reflected back by the second color ink particles 232. At this time, the pixel will also appear red (bright red).

[0066] 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 and Embodiment 2, and will not be described in detail here.

[0067] [Example 4] Fig.17 It is a schematic structural diagram of the reflective display device in the initial state in the fourth embodiment of the present invention. Fig.18 Schematic diagram of the structure of the reflective display device in the fourth embodiment of the present invention when displaying a color image. Fig.17 and Fig.18 As shown, the reflective display device and control method provided by the fourth embodiment of the present invention are the same as those provided by the first embodiment ( Figures 1 to 11 )、Example 2 ( Figure 12 to Figure 14 ) are basically the same, except that: In this embodiment, the electrophoretic liquid 233 is an electrophoretic liquid of the third color, and the first color, the second color, and the third color are each one of red, green, and blue, so that various colors can be mixed. For example, the first color is red, the second color is green, and the third color is blue; or the first color is red, the second color is blue, and the third color is green; or the first color is green, the second color is red, and the third color is blue; or the first color is green, the second color is blue, and the third color is red; or the first color is blue, the second color is green, and the third color is red; or the first color is blue, the second color is green, and the third color is red; or the first color is blue, the second color is green, and the third color is red; or the first color is blue, the second color is red, and the third color is green.

[0068] Furthermore, the second opposing substrate 21 is a third array substrate, the auxiliary electrode 211 includes a plurality of third pixel electrodes distributed in an array, the third pixel electrodes correspond to the second pixel units P2 one by one, the third pixel electrodes include a third sub-pixel electrode block 211a and a fourth sub-pixel electrode block 211b that are independent of each other, the third sub-pixel electrode block 211a cooperates with the first sub-pixel electrode block 221a, and the fourth sub-pixel electrode block 211b cooperates with the second sub-pixel electrode block 221b. Among them, the projections of the first sub-pixel electrode block 221a and the third sub-pixel electrode block 211a on the second array substrate 22 overlap with each other, and the projections of the second sub-pixel electrode block 221b and the fourth sub-pixel electrode block 211b on the second array substrate 22 overlap with each other. That is, the second opposing substrate 21 in this embodiment is the same as that in the second embodiment ( Fig.13 and Fig.14 ), of course, the second opposing substrate 21 in this embodiment may also be the second opposing substrate 21 in embodiment 1.

[0069] This embodiment also provides a control method for driving the reflective display device as described above. The following is an example of black ink particles 231 being negatively charged and second color ink particles 232 being positively charged. The control method includes: like Fig.18For the first pixel in the figure (from left to right), when the pixel displays black, the cholesterol liquid crystal layer 13 in the area corresponding to the pixel is controlled to be in a misty or transparent state, and all the black ink particles 231 in the ink capsule 23 in the area corresponding to the pixel are controlled to be concentrated on the upper side. The light passing through the liquid crystal box 10 is absorbed by the black ink particles 231, and the pixel appears black at this time.

[0070] like Fig.18 For the fourth pixel in the image (from left to right), when the pixel is in the first color, the cholesterol liquid crystal layer 13 in the area corresponding to the pixel is controlled to be in a reflective state and reflect the light of the first color, and the black ink particles 231 in all the ink capsules 23 in the area corresponding to the pixel are controlled to be concentrated on the upper side, and other light passing through the liquid crystal box 10 is absorbed by the black ink particles 231, so that the pixel presents the first color (red).

[0071] like Fig.18 For the second pixel in the image (from left to right), when the pixel is in the second color, the cholesterol liquid crystal layer 13 in the area corresponding to the pixel is controlled to be in a foggy state or a transparent state, and all the second color ink particles 232 in the ink capsule 23 in the area corresponding to the pixel are controlled to be concentrated on the upper side and reflect the second color light. The green light passing through the liquid crystal box 10 is reflected back by the second color ink particles 232, thereby presenting the second color (foggy green or bright green).

[0072] like Fig.18 For the third pixel in the image (from left to right), when the pixel is in the third color, the cholesterol liquid crystal layer 13 in the area corresponding to the pixel is controlled to be in a foggy state or a transparent state, and all the black ink particles 231 and all the second color ink particles 232 in the ink capsule 23 in the area corresponding to the pixel are concentrated on the lower side, and the blue light passing through the liquid crystal box 10 is reflected back by the second color ink particles 232, thereby presenting a third color (foggy blue or bright blue). Among them, by controlling the voltage on the first sub-pixel electrode block 221a, the second sub-pixel electrode block 221b, the third sub-pixel electrode block 211a and the fourth sub-pixel electrode block 211b, all the black ink particles 231 and all the second color ink particles 232 can be concentrated on the lower side, all the black ink particles 231 and all the second color ink particles 232 can be concentrated on the upper side, part of the black ink particles 231 and part of the second color ink particles 232 can be concentrated on the upper side, all the black ink particles 231 can be concentrated on the lower side and all the second color ink particles 232 can be concentrated on the upper side, or all the black ink particles 231 can be concentrated on the upper side and all the second color ink particles 232 can be concentrated on the lower side.

[0073] When the reflective display device needs to display color, it only needs to control the corresponding pixels to display the corresponding colors. According to the principle of the three primary colors of light, the reflective display device can display pictures in multiple colors.

[0074] 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 and Embodiment 2, and will not be described in detail here.

[0075] [Example 5] Fig.19 It is a schematic structural diagram of the reflective display device in the initial state in the fifth embodiment of the present invention. Fig. 20 Schematic diagram of the structure of the reflective display device in the fifth embodiment of the present invention when the screen is black and white. Fig.19 and Fig. 20 As shown, the reflective display device and control method provided in the fifth embodiment of the present invention are similar to those in the first embodiment ( Figures 1 to 11 ) are basically the same, except that: In this embodiment, the liquid crystal box 10 includes a first opposing substrate 11, a first array substrate 12 disposed opposite to the first opposing substrate 11, and a polymer dispersed liquid crystal layer 14 (PDLC) located between the first opposing substrate 11 and the first array substrate 12. The polymer dispersed liquid crystal layer 14 reflects light of a first color in a foggy state. The first array substrate 12 is provided with a first pixel electrode 121 corresponding to the first pixel unit P1, and the first opposing substrate 11 is provided with a first common electrode 111 matched with the first pixel electrode 121. In the scattering mode, the voltage difference between the first pixel electrode 121 and the first common electrode 111 is less than a first preset value, so that the polymer dispersed liquid crystal layer 14 is in a foggy state and has a light scattering effect; in the transmission mode, the voltage difference between the first pixel electrode 121 and the first common electrode 111 is greater than a second preset value, so that the polymer dispersed liquid crystal layer 14 is in a transparent state. Thus, the polymer dispersed liquid crystal layer 14 is controlled to switch between the foggy state and the transparent state by controlling the electrical signals applied to the first pixel electrode 121 and the first common electrode 111. The smaller the voltage difference between the first pixel electrode 121 and the first common electrode 111 , the closer the polymer dispersed liquid crystal layer 14 is to a mist state. Conversely, the larger the voltage difference between the first pixel electrode 121 and the first common electrode 111 , the closer the polymer dispersed liquid crystal layer 14 is to a transparent state.

[0076] In this embodiment, the first color and the second color are both white, that is, the polymer dispersed liquid crystal layer 14 can reflect white light in a foggy state, and the second color ink particles 232 are white ink particles and reflect white light. The polymer dispersed liquid crystal layer 14 includes polymer liquid crystal molecules 141, so that it can reflect white light in a foggy state.

[0077] This embodiment also provides a control method for driving the reflective display device as described above. The following is an example of black ink particles 231 being negatively charged and second color ink particles 232 being positively charged. The control method includes: like Fig. 20 For the first pixel in the image (from left to right), when the pixel displays white of the first brightness, the polymer dispersed liquid crystal layer 14 in the area corresponding to the pixel is controlled to be in a foggy state, and all the second color ink particles 232 in the ink capsules 23 in the area corresponding to the pixel are controlled to be concentrated on the upper side and reflect the second color light. Part of the light is reflected back by the polymer dispersed liquid crystal layer 14, and another part of the light passes through the liquid crystal box 10 and is reflected back by the second color ink particles 232. At this time, the pixel displays white of the first brightness.

[0078] like Fig. 20 For the second pixel in the image (from left to right), when the pixel displays white of the second brightness, the polymer dispersed liquid crystal layer 14 in the area corresponding to the pixel is controlled to be transparent, and all the second color ink particles 232 in the ink capsules 23 in the area corresponding to the pixel are controlled to be concentrated on the upper side and reflect the second color light. The light passing through the liquid crystal box 10 is reflected back by the second color ink particles 232, and the pixel displays white of the second brightness.

[0079] like Fig. 20 For the third pixel in the image (from left to right), when the pixel displays white at the third brightness, the polymer dispersed liquid crystal layer 14 in the area corresponding to the pixel is controlled to be in a foggy state, and part of the black ink particles 231 and part of the second color ink particles 232 in the ink capsule 23 in the area corresponding to the pixel are controlled to be concentrated on the upper side. Part of the light is reflected back by the polymer dispersed liquid crystal layer 14, and another part of the light passing through the liquid crystal box 10 is reflected back by the second color ink particles 232 and absorbed by the black ink particles 231. At this time, the pixel displays white at the third brightness.

[0080] like Fig. 20 The fourth pixel in the image (from left to right), when the pixel displays black, the polymer dispersed liquid crystal layer 14 in the area corresponding to the pixel is controlled to be transparent, and all the black ink particles 231 in the ink capsule 23 in the area corresponding to the pixel are controlled to be concentrated on the upper side, and the light passing through the liquid crystal box 10 is absorbed by the black ink particles 231, and the pixel appears black at this time.

[0081] When the pixel displays gray, the polymer dispersed liquid crystal layer 14 in the area corresponding to the pixel is controlled to be transparent, and some black ink particles 231 and some second color ink particles 232 in the ink capsule 23 in the area corresponding to the pixel are concentrated on the upper side. Part of the light passing through the liquid crystal box 10 is reflected back by the second color ink particles 232, and the other part of the light is absorbed by the black ink particles 231. At this time, the pixel appears gray.

[0082] 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.

[0083] [Example 6] Fig.21 It is a schematic structural diagram of the reflective display device in the initial state in the sixth embodiment of the present invention. Fig. 22 FIG. 1 is a schematic diagram of the structure of the reflective display device in Embodiment 6 of the present invention when displaying a color image. Fig.21 and Fig. 22 As shown, the reflective display device and control method provided in the sixth embodiment of the present invention are similar to those in the fourth embodiment ( Fig.17 and Fig.18 ) are basically the same, except that: In this embodiment, the liquid crystal box 10 includes a first opposing substrate 11, a first array substrate 12 disposed opposite to the first opposing substrate 11, and a polymer dispersed liquid crystal layer 14 (PDLC) located between the first opposing substrate 11 and the first array substrate 12. The polymer dispersed liquid crystal layer 14 reflects light of a first color in a foggy state. The first array substrate 12 is provided with a first pixel electrode 121 corresponding to the first pixel unit P1, and the first opposing substrate 11 is provided with a first common electrode 111 matched with the first pixel electrode 121. In the scattering mode, the voltage difference between the first pixel electrode 121 and the first common electrode 111 is less than a first preset value, so that the polymer dispersed liquid crystal layer 14 is in a foggy state and has a light scattering effect; in the transmission mode, the voltage difference between the first pixel electrode 121 and the first common electrode 111 is greater than a second preset value, so that the polymer dispersed liquid crystal layer 14 is in a transparent state. Thus, the polymer dispersed liquid crystal layer 14 is controlled to switch between the foggy state and the transparent state by controlling the electrical signals applied to the first pixel electrode 121 and the first common electrode 111. The smaller the voltage difference between the first pixel electrode 121 and the first common electrode 111 , the closer the polymer dispersed liquid crystal layer 14 is to a mist state. Conversely, the larger the voltage difference between the first pixel electrode 121 and the first common electrode 111 , the closer the polymer dispersed liquid crystal layer 14 is to a transparent state.

[0084] In this embodiment, the first color is a color, and the polymer dispersed liquid crystal layer 14 includes polymer liquid crystal molecules 141 mixed with each other and dye molecules 142 of the first color. Among them, the light absorption capacity of the long axis of the dye molecule 142 of the first color is greater than the light absorption capacity of the short axis, that is, the dye molecule 142 has the characteristics of strong light absorption capacity of the long axis and very weak light absorption capacity of the short axis. Charged particles with opposite polarities can be set at both ends of the dye molecule 142, so that the dye molecule 142 can be deflected in the electric field.

[0085] Furthermore, the electrophoretic liquid 233 is a third color electrophoretic liquid, and the first color, the second color and the third color are each one of red, green and blue, so that various colors can be mixed. In this embodiment, the first color is red, the second color is green, and the third color is blue.

[0086] This embodiment also provides a control method for driving the reflective display device as described above. The following is an example of black ink particles 231 being negatively charged and second color ink particles 232 being positively charged. The control method includes: like Fig. 22 For the first pixel in the image (from left to right), when the pixel displays black, the polymer dispersed liquid crystal layer 14 in the area corresponding to the pixel is controlled to be transparent, and the dye molecules 142 are in a vertical state, and all the black ink particles 231 in the ink capsules 23 in the area corresponding to the pixel are controlled to be concentrated on the upper side, and the light passing through the liquid crystal box 10 is absorbed by the black ink particles 231, and the pixel appears black at this time.

[0087] like Fig. 22 For the fourth pixel in the image (from left to right), when the pixel is in the first color, the polymer dispersed liquid crystal layer 14 in the area corresponding to the pixel is controlled to be in a foggy state, and the dye molecules 142 are in a tilted or lying state and reflect the light of the first color, and the black ink particles 231 in all the ink capsules 23 in the area corresponding to the pixel are controlled to be concentrated on the upper side, and other light passing through the liquid crystal box 10 is absorbed by the black ink particles 231, so that the pixel presents the first color (red).

[0088] like Fig. 22 For the second pixel in the image (from left to right), when the pixel is in the second color, the polymer dispersed liquid crystal layer 14 in the area corresponding to the pixel is controlled to be transparent, and the dye molecules 142 are in a vertical state, and all the second color ink particles 232 in the ink capsules 23 in the area corresponding to the pixel are controlled to be concentrated on the upper side and reflect the second color light, and the green light passing through the liquid crystal box 10 is reflected back by the second color ink particles 232, thereby presenting the second color (green).

[0089] like Fig. 22For the third pixel in the image (from left to right), when the pixel is in the third color, the polymer dispersed liquid crystal layer 14 in the area corresponding to the pixel is controlled to be transparent, and the dye molecules 142 are in a vertical state, and all the black ink particles 231 and all the second color ink particles 232 in the ink capsule 23 in the area corresponding to the pixel are concentrated on the lower side, and the blue light passing through the liquid crystal box 10 is reflected back by the second color ink particles 232, thereby presenting the third color (blue). Among them, by controlling the voltage on the first sub-pixel electrode block 221a, the second sub-pixel electrode block 221b, the third sub-pixel electrode block 211a and the fourth sub-pixel electrode block 211b, all the black ink particles 231 and all the second color ink particles 232 can be concentrated on the lower side, all the black ink particles 231 and all the second color ink particles 232 can be concentrated on the upper side, part of the black ink particles 231 and part of the second color ink particles 232 can be concentrated on the upper side, all the black ink particles 231 can be concentrated on the lower side and all the second color ink particles 232 can be concentrated on the upper side, or all the black ink particles 231 can be concentrated on the upper side and all the second color ink particles 232 can be concentrated on the lower side.

[0090] When the reflective display device needs to display color, it only needs to control the corresponding pixels to display the corresponding colors. According to the principle of the three primary colors of light, the reflective display device can display pictures in multiple colors.

[0091] 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 fourth embodiment and will not be described in detail here.

[0092] 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.

[0093] 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: It comprises a liquid crystal box (10) and an electronic ink screen (20) stacked on the lower side of the liquid crystal box (10), wherein the liquid crystal box (10) has a plurality of first pixel units (P1) distributed in an array, and the electronic ink screen (20) has second pixel units (P2) corresponding one-to-one to the first pixel units (P1); The liquid crystal box (10) comprises a first opposing substrate (11), a first array substrate (12) arranged opposite to the first opposing substrate (11), and a cholesterol liquid crystal layer (13) located between the first opposing substrate (11) and the first array substrate (12); the cholesterol liquid crystal layer (13) reflects light of a first color in a reflective state; the first array substrate (12) is provided with a first pixel electrode (121) corresponding one-to-one to the first pixel unit (P1); and the first opposing substrate (11) is provided with a first common electrode (111) matched with the first pixel electrode (121); The electronic ink screen (20) comprises a second opposing substrate (21), a second array substrate (22) arranged opposite to the second opposing substrate (21), and ink capsules (23) located between the second opposing substrate (21) and the second array substrate (22); all the ink capsules (23) are provided with electrophoretic liquid (233) and black ink particles (231) and second color ink particles (232) of opposite polarity; the second color ink particles (232) are used to reflect light of a second color; the second array substrate (22) is provided with second pixel electrodes (221) corresponding one-to-one to the second pixel units (P2); the second opposing substrate (21) is provided with an auxiliary electrode (211) matched with the second pixel electrode (221); the second pixel electrode (221) comprises a first sub-pixel electrode block (221a) and a second sub-pixel electrode block (221b) which are independent of each other.

2. A reflective display device, characterized in that: It comprises a liquid crystal box (10) and an electronic ink screen (20) stacked on the lower side of the liquid crystal box (10), wherein the liquid crystal box (10) has a plurality of first pixel units (P1) distributed in an array, and the electronic ink screen (20) has second pixel units (P2) corresponding one-to-one to the first pixel units (P1); The liquid crystal box (10) comprises a first opposing substrate (11), a first array substrate (12) arranged opposite to the first opposing substrate (11), and a polymer dispersed liquid crystal layer (14) located between the first opposing substrate (11) and the first array substrate (12); the polymer dispersed liquid crystal layer (14) reflects light of a first color in a foggy state; the first array substrate (12) is provided with a first pixel electrode (121) corresponding one-to-one to the first pixel unit (P1); and the first opposing substrate (11) is provided with a first common electrode (111) matched with the first pixel electrode (121); The electronic ink screen (20) comprises a second opposing substrate (21), a second array substrate (22) arranged opposite to the second opposing substrate (21), and ink capsules (23) located between the second opposing substrate (21) and the second array substrate (22); all the ink capsules (23) are provided with electrophoretic liquid (233) and black ink particles (231) and second color ink particles (232) of opposite polarity; the second color ink particles (232) are used to reflect light of a second color; the second array substrate (22) is provided with second pixel electrodes (221) corresponding one-to-one to the second pixel units (P2); the second opposing substrate (21) is provided with an auxiliary electrode (211) matched with the second pixel electrode (221); the second pixel electrode (221) comprises a first sub-pixel electrode block (221a) and a second sub-pixel electrode block (221b) which are independent of each other.

3. The reflective display device according to claim 2, characterized in that: The first color and the second color are both white; Alternatively, the first color is a color, and the polymer dispersed liquid crystal layer (14) comprises polymer liquid crystal molecules (141) mixed with each other and dye molecules (142) of the first color.

4. The reflective display device according to claim 1 or 2, characterized in that: The second color is white; Alternatively, the second color is the same color as the first color; Alternatively, the second color is a color different from the first color.

5. The reflective display device according to claim 1 or 2, characterized in that: The electrophoresis liquid (233) is a transparent electrophoresis liquid; Alternatively, the electrophoretic fluid (233) is an electrophoretic fluid of a third color, and the first color, the second color and the third color are each one of red, green and blue.

6. The reflective display device according to claim 1 or 2, characterized in that: The auxiliary electrode (211) is a second common electrode that entirely covers the second opposing substrate (21); Alternatively, the second opposing substrate (21) is a third array substrate, the auxiliary electrode (211) comprises a plurality of third pixel electrodes distributed in an array, the third pixel electrodes correspond one to one with the second pixel units (P2), the third pixel electrodes comprise a third sub-pixel electrode block (211a) and a fourth sub-pixel electrode block (211b) which are independent of each other, the third sub-pixel electrode block (211a) cooperates with the first sub-pixel electrode block (221a), and the fourth sub-pixel electrode block (211b) cooperates with the second sub-pixel electrode block (221b).

7. A control method for a reflective display device, characterized in that: Used to drive the reflective display device as claimed in claim 1, the electrophoretic liquid (233) is a transparent electrophoretic liquid, the second color is white, and the control method comprises: When the pixel displays black, the cholesterol liquid crystal layer (13) in the area corresponding to the pixel is controlled to be in a mist state or a transparent state, and all the black ink particles (231) in the ink capsule (23) in the area corresponding to the pixel are controlled to be concentrated on the upper side; When the pixel displays white, the cholesterol liquid crystal layer (13) in the area corresponding to the pixel is controlled to be in a mist state or a transparent state, and all the second color ink particles (232) in the ink capsule (23) in the area corresponding to the pixel are controlled to be concentrated on the upper side and reflect the light of the second color; When the pixel displays gray, the cholesterol liquid crystal layer (13) in the area corresponding to the pixel is controlled to be in a mist state or a transparent state, and part of the black ink particles (231) and part of the second color ink particles (232) in the ink capsule (23) in the area corresponding to the pixel are controlled to be concentrated on the upper side; When the pixel is at a first color brightness, the cholesterol liquid crystal layer (13) in the area corresponding to the pixel is controlled to be in a reflective state and reflect light of a first color, and the black ink particles (231) in all the ink capsules (23) in the area corresponding to the pixel are controlled to be concentrated on the upper side; When the pixel is at the second color brightness, the cholesterol liquid crystal layer (13) in the area corresponding to the pixel is controlled to be in a reflective state and reflect light of the first color, and part of the black ink particles (231) and part of the second color ink particles (232) in the ink capsule (23) in the area corresponding to the pixel are controlled to be concentrated on the upper side.

8. A control method for a reflective display device, characterized in that: Used to drive the reflective display device as claimed in claim 1, the electrophoretic liquid (233) is a transparent electrophoretic liquid, the second color is the same color as the first color, and the control method comprises: When the pixel displays black, the cholesterol liquid crystal layer (13) in the area corresponding to the pixel is controlled to be in a mist state or a transparent state, and all the black ink particles (231) in the ink capsule (23) in the area corresponding to the pixel are controlled to be concentrated on the upper side; When the pixel displays a first color brightness, the cholesterol liquid crystal layer (13) in the area corresponding to the pixel is controlled to be in a reflective state and reflect light of the first color, and the black ink particles (231) in all the ink capsules (23) in the area corresponding to the pixel are controlled to be concentrated on the upper side; When the pixel displays the second color brightness, the cholesterol liquid crystal layer (13) in the area corresponding to the pixel is controlled to be in a reflective state and reflect light of the first color, and part of the black ink particles (231) and part of the second color ink particles (232) in the ink capsule (23) in the area corresponding to the pixel are controlled to be concentrated on the upper side; When the pixel displays the third color brightness, the cholesterol liquid crystal layer (13) in the area corresponding to the pixel is controlled to be in a reflective state and reflect light of the first color, and all the ink particles (232) of the second color in the ink capsule (23) in the area corresponding to the pixel are controlled to be concentrated on the upper side and reflect light of the second color; When the pixel displays the fourth color brightness, the cholesterol liquid crystal layer (13) in the area corresponding to the pixel is controlled to be in a mist state or a transparent state, and all the second color ink particles (232) in the ink capsule (23) in the area corresponding to the pixel are controlled to be concentrated on the upper side and reflect the second color light; When the pixel displays the fifth color brightness, the cholesterol liquid crystal layer (13) in the area corresponding to the pixel is controlled to be in a mist state or a transparent state, and part of the black ink particles (231) and part of the second color ink particles (232) in the ink capsule (23) in the area corresponding to the pixel are controlled to be concentrated on the upper side.

9. A control method for a reflective display device, characterized in that: Used to drive the reflective display device as claimed in claim 1, the electrophoretic liquid (233) is an electrophoretic liquid of a third color, the first color, the second color and the third color are each one of red, green and blue, and the control method comprises: When the pixel displays black, the cholesterol liquid crystal layer (13) in the area corresponding to the pixel is controlled to be in a mist state or a transparent state, and all the black ink particles (231) in the ink capsule (23) in the area corresponding to the pixel are controlled to be concentrated on the upper side; When the pixel is in the first color, the cholesterol liquid crystal layer (13) in the area corresponding to the pixel is controlled to be in a reflective state and reflect light of the first color, and the black ink particles (231) in all the ink capsules (23) in the area corresponding to the pixel are controlled to be concentrated on the upper side; When the pixel is in the second color, the cholesterol liquid crystal layer (13) in the area corresponding to the pixel is controlled to be in a mist state or a transparent state, and all the ink particles (232) of the second color in the ink capsule (23) in the area corresponding to the pixel are controlled to be concentrated on the upper side and reflect the light of the second color; When the pixel is in the third color, the cholesterol liquid crystal layer (13) in the area corresponding to the pixel is controlled to be in a mist state or a transparent state, and all the black ink particles (231) and all the second color ink particles (232) in the ink capsule (23) in the area corresponding to the pixel are controlled to be concentrated on the lower side.

10. A control method for a reflective display device, characterized in that: Used to drive the reflective display device as claimed in claim 2, the polymer dispersed liquid crystal layer (14) comprises polymer liquid crystal molecules (141) and dye molecules (142) of a first color that are mixed with each other, the electrophoretic liquid (233) is an electrophoretic liquid of a third color, the first color, the second color and the third color are each one of red, green and blue, and the control method comprises: When a pixel displays black, the polymer dispersed liquid crystal layer (14) in the area corresponding to the pixel is controlled to be in a transparent state, and all the black ink particles (231) in the ink capsule (23) in the area corresponding to the pixel are controlled to be concentrated on the upper side; When the pixel is in the first color, the polymer dispersed liquid crystal layer (14) in the area corresponding to the pixel is controlled to be in a mist state and reflect light of the first color, and the black ink particles (231) in all the ink capsules (23) in the area corresponding to the pixel are controlled to be concentrated on the upper side; When the pixel is in the second color, the polymer dispersed liquid crystal layer (14) in the area corresponding to the pixel is controlled to be in a transparent state, and all the ink particles (232) of the second color in the ink capsule (23) in the area corresponding to the pixel are controlled to be concentrated on the upper side and reflect light of the second color; When the pixel is in the third color, the polymer dispersed liquid crystal layer (14) in the area corresponding to the pixel is controlled to be in a transparent state, and all the black ink particles (231) and all the second color ink particles (232) in the ink capsule (23) in the area corresponding to the pixel are controlled to be concentrated on the lower side.

Images