Reflective display panel and driving method

Abstract

The application discloses a reflective display panel and a driving method. The reflective display panel comprises a liquid crystal box and an electronic ink screen stacked on the lower side of the liquid crystal box. The liquid crystal box comprises a first opposed substrate, a first array substrate arranged opposite to the first opposed substrate, and a cholesteric liquid crystal layer between the first opposed substrate and the first array substrate. All the cholesteric liquid crystal layers reflect light of a first color in a reflective state. The electronic ink screen comprises a second opposed substrate, a second array substrate arranged opposite to the second opposed substrate, and an ink capsule between the second opposed substrate and the second array substrate. All the ink capsules are provided with black ink particles and second color ink particles of opposite polarity. The second color ink particles are used for reflecting light of a second color. The application does not need to set a polaroid and multiple cholesteric liquid crystal boxes, realizes color display, improves the utilization rate of ambient light, and reduces the thickness of the reflective display panel and the driving power consumption.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a reflective display panel and its driving method. Background Technology

[0002] Display panels offer advantages such as thinness, durability, and low power consumption, which are energy-efficient and environmentally friendly. However, they require a backlight, resulting in a thicker module and higher cost. Electronic paper displays (reflective displays) have emerged as a solution to meet the needs of the general public. Unlike LCD displays, which require a backlight, electronic paper displays can use external light sources to display images. Therefore, even in strong sunlight, the information on the electronic paper remains clearly visible without viewing angle issues. Furthermore, due to their energy efficiency, high reflectivity, and high contrast ratio, electronic paper displays are now widely used in e-readers (such as e-books and e-newspapers) and other electronic components (such as price tags).

[0003] Existing electronic paper displays typically employ E-Ink microcapsule technology (microcapsule electronic ink technology), SiPix microcup technology (microcup electrophoretic display technology), Bridgestone electronic liquid powder technology, Cholesteric Liquid Crystal Display (CLCD) technology, microelectromechanical systems (MEMS) technology, or electrowetting technology. However, existing electronic paper display technologies are less mature than liquid crystal display technologies, have lower mass production efficiency, higher manufacturing costs, and cannot achieve color display.

[0004] To achieve color reflective display, reflective liquid crystal displays (LCDs) are typically used. However, this requires polarizers, which cause significant light loss. When the ambient light source is weak, the brightness of the reflective LCD will be even lower, resulting in lower contrast. Alternatively, cholesteric liquid crystal bistable reflective displays can be used. Due to the pitch requirements of cholesteric liquid crystals, a single pitch can only reflect one color. Generally, a single-cell architecture can only perform monochrome or black-and-white reflective displays. If color reflective display is required, a three-layer liquid crystal cell architecture is needed, resulting in a thicker overall structure. Summary of the Invention

[0005] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this invention is to provide a reflective display panel and driving method to solve the problem that electronic paper displays in the prior art cannot achieve color display or that the thickness of the cell for achieving color display is too thick.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] The present invention provides a reflective display panel, including a liquid crystal cell and an electronic ink screen stacked on the underside of the liquid crystal cell;

[0008] The liquid crystal cell includes a first opposing substrate, a first array substrate disposed opposite to the first opposing substrate, and a cholesteric liquid crystal layer located between the first opposing substrate and the first array substrate. All of the cholesteric liquid crystal layers reflect light of a first color in the reflective state. A first pixel electrode is provided on the first array substrate, and a first common electrode that cooperates with the first pixel electrode is provided on the first opposing substrate.

[0009] The electronic ink screen includes a second opposing substrate, a second array substrate disposed opposite to the second opposing substrate, and an ink capsule located between the second opposing substrate and the second array substrate. All the ink capsules contain black ink particles and second color ink particles of opposite polarity. The second color ink particles are used to reflect light of the second color. The second array substrate is provided with a second pixel electrode, and the second opposing substrate is provided with a second common electrode that cooperates with the second pixel electrode.

[0010] Furthermore, the first color and the second color are complementary colors, and the light of the first color and the light of the second color are mixed to form white light.

[0011] Furthermore, the first color is cyan and the second color is red; or the first color is purple and the second color is green; or the first color is yellow and the second color is blue.

[0012] Furthermore, the first color is a single color, and the second color is white.

[0013] Furthermore, a first side electrode and a second side electrode that are parallel to each other are provided between the second opposing substrate and the second array substrate, and the first side electrode and the second side electrode are alternately arranged, with the ink capsule located between adjacent first side electrodes and second side electrodes;

[0014] The second pixel electrode is a reflective electrode with reflective properties.

[0015] Furthermore, the liquid crystal cell has a plurality of first pixel units arranged in an array, and the electronic ink screen has a plurality of second pixel units arranged in an array, with the first pixel units corresponding one-to-one with the second pixel units.

[0016] This application also provides a driving method for a reflective display panel, used to drive the reflective display panel as described above, the driving method comprising:

[0017] When a pixel displays black, the cholesteric liquid crystal layer in the area corresponding to the pixel is controlled to be in a foggy or transparent state, and the black ink particles in the ink capsule in the area corresponding to the pixel are controlled to concentrate on the side close to the second common electrode.

[0018] When a pixel displays color, the cholesteric liquid crystal layer in the region corresponding to the pixel is controlled to be in a reflective state and reflect light of the first color, and the black ink particles in the ink capsule in the region corresponding to the pixel are controlled to be concentrated near the second common electrode; or, the cholesteric liquid crystal layer in the region corresponding to the pixel is controlled to be in a foggy or transparent state, and the second color ink particles in the ink capsule in the region corresponding to the pixel are controlled to be concentrated near the second common electrode and reflect light of the second color.

[0019] Furthermore, the first color and the second color are complementary colors, and the light of the first color and the light of the second color mix to form white light. The driving method includes:

[0020] When a pixel displays white, the cholesteric 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 the ink particles of the second color in the ink capsule in the area corresponding to the pixel are controlled to concentrate near the second common electrode and reflect light of the second color.

[0021] Further, the first color is a single color, the second color is white, and the driving method includes:

[0022] When a pixel displays white, the cholesteric liquid crystal layer in the area corresponding to the pixel is controlled to be in a foggy or transparent state, and the second color ink particles in the ink capsule in the area corresponding to the pixel are controlled to concentrate near the second common electrode and reflect the second color light.

[0023] Furthermore, a first side electrode and a second side electrode, parallel to each other, are provided between the second opposing substrate and the second array substrate. The first side electrode and the second side electrode are alternately arranged. The ink capsule is located between adjacent first side electrodes and second side electrodes. The second pixel electrode is a reflective electrode with reflective properties. The driving method includes:

[0024] When the reflective display panel is mirror-reflected, it controls all the cholesterol liquid crystal layers to be in a foggy or transparent state, and controls all the black ink particles and the second color ink particles in the ink capsules to be concentrated on the left and right sides of the ink capsules, respectively.

[0025] The beneficial effects of this invention are as follows: by cooperating between the cholesteric liquid crystal cell that reflects the first color light and the electronic ink screen that reflects the second color light, color reflective display can be achieved without setting up a polarizer and multiple cholesteric liquid crystal cells, thereby improving the utilization rate of ambient light and contrast, and reducing the cell thickness and driving power consumption of the reflective display panel. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the reflective display panel in Embodiment 1 of the present invention when reflecting the first color light;

[0027] Figure 2 This is a schematic diagram of the planar structure of the first array substrate in Embodiment 1 of the present invention;

[0028] Figure 3 This is a schematic diagram of the planar structure of the second array substrate in Embodiment 1 of the present invention;

[0029] Figure 4 This is a schematic diagram illustrating the principle of the three state transitions of cholesterol liquid crystal in Embodiment 1 of the present invention;

[0030] Figure 5 This is a schematic diagram of the driving signals for the three state transitions of cholesterol liquid crystal in Embodiment 1 of the present invention;

[0031] Figure 6 This is one of the structural schematic diagrams of the reflective display panel in the black state in Embodiment 1 of the present invention;

[0032] Figure 7 This is the second schematic diagram of the reflective display panel in the black state in Embodiment 1 of the present invention;

[0033] Figure 8 This is one of the structural schematic diagrams of the reflective display panel in Embodiment 1 of the present invention when reflecting a second color light;

[0034] Figure 9 This is the second schematic diagram of the structure of the reflective display panel in Embodiment 1 of the present invention when reflecting the second color light;

[0035] Figure 10 This is a schematic diagram of the structure of the reflective display panel in Embodiment 1 of the present invention when reflecting white light;

[0036] Figure 11 This is one of the structural schematic diagrams of the reflective display panel in color display according to Embodiment 1 of the present invention;

[0037] Figure 12 This is the second schematic diagram of the reflective display panel in color display according to Embodiment 1 of the present invention;

[0038] Figure 13This is one of the structural schematic diagrams of the reflective display panel in color display according to Embodiment 2 of the present invention;

[0039] Figure 14 This is the second schematic diagram of the reflective display panel in color display according to Embodiment 2 of the present invention;

[0040] Figure 15 This is a schematic diagram of the reflective display panel in color display according to Embodiment 3 of the present invention;

[0041] Figure 16 This is one of the structural schematic diagrams of the reflective display panel in the fourth embodiment of the present invention when it is mirror-reflected;

[0042] Figure 17 This is a schematic diagram of the structure of the first side electrode and the second side electrode in Embodiment 4 of the present invention;

[0043] Figure 18 This is the second schematic diagram of the reflective display panel in the fourth embodiment of the present invention when it is mirrored. Detailed Implementation

[0044] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description, in conjunction with the accompanying drawings and preferred embodiments, provides a detailed explanation of the specific implementation methods, structures, features, and effects of the reflective display panel and driving method proposed according to the present invention:

[0045] [Example 1]

[0046] Figure 1 This is a schematic diagram of the structure of the reflective display panel in Embodiment 1 of the present invention when reflecting the first color light. Figure 2 This is a schematic diagram of the planar structure of the first array substrate in Embodiment 1 of the present invention. Figure 3 This is a schematic diagram of the planar structure of the second array substrate in Embodiment 1 of the present invention.

[0047] like Figures 1 to 3 As shown, a reflective display panel provided in Embodiment 1 of the present invention includes a liquid crystal cell 10 and an electronic ink screen 20 stacked below the liquid crystal cell 10. The side of the reflective display panel closer to ambient light is the upper side, and the side farther from ambient light is the lower side; that is, the liquid crystal cell 10 is located on the side of the electronic ink screen 20 closer to ambient light. The liquid crystal cell 10 has a plurality of first pixel units P1 arranged in an array, and the electronic ink screen 20 has a plurality of second pixel units P2 arranged in an array. In this embodiment, the first pixel units P1 and second pixel units P2 correspond one-to-one; of course, one first pixel unit P1 can correspond to multiple second pixel units P2, or multiple first pixel units P1 can correspond to one second pixel unit P2.

[0048] The liquid crystal cell 10 includes a first opposing substrate 11, a first array substrate 12 disposed opposite to the first opposing substrate 11, and a cholesteric liquid crystal layer 13 located between the first opposing substrate 11 and the first array substrate 12. All cholesteric liquid crystal layers 13 reflect light of a first color in reflective state. The first opposing substrate 11 is located on the side of the liquid crystal cell 10 closest to the external environment, and the first array substrate 12 is located on the side of the liquid crystal cell 10 closest to the e-ink screen 20. The first array substrate 12 is provided with a first pixel electrode 121, which corresponds one-to-one with a first pixel unit P1. The first opposing substrate 11 is provided with a first common electrode 111 that cooperates with the first pixel electrode 121. 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 that covers the entire surface of the first opposing substrate 11.

[0049] The cholesteric liquid crystal in the cholesteric liquid crystal layer 13 possesses three stable textures: P-state (Planar, reflective state), FC-state (Focal Conic, hazy state), and H-state (transparent state). In the P-state, the cholesteric liquid crystal's reflection spectrum is in the visible spectrum, reflecting bright colored light; the specific reflected color can be set according to the pitch of the cholesteric liquid crystal. In the FC-state, the cholesteric liquid crystal no longer reflects the aforementioned colored light, and light can be scattered and transmitted through it. In the H-state, the cholesteric liquid crystal no longer reflects the aforementioned colored light, and light can pass directly through it without any scattering effect. Under a certain electric field, these three states can interconvert.

[0050] Figure 4 This is a schematic diagram illustrating the principle of the three state transitions of cholesterol liquid crystal in Embodiment 1 of the present invention. Figure 5 This is a schematic diagram of the driving signals for the three state transitions of cholesterol liquid crystal in Embodiment 1 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 electrical signal V1 is continuously applied to the first pixel electrode 121. There is a voltage difference (e.g., 16V) between the common voltage signal Vcom and the first electrical signal V1. A strong vertical electric field is 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). A common voltage signal Vcom is applied to the first common electrode 111, and a second electrical signal V2 is applied to the first pixel electrode 121. There is a voltage difference (e.g., 16V) between the second electrical signal V2 and the common voltage signal Vcom. The second electrical signal V2 gradually becomes the same as the common voltage signal Vcom within a first preset time. That is, the second electrical signal V2 first has a large voltage difference with the common voltage signal Vcom, and then slowly decreases and becomes the same as the common voltage signal Vcom. Therefore, a strong vertical electric field is initially formed between the first common electrode 111 and the first pixel electrode 121. This vertical electric field then slowly disappears, causing the cholesteric liquid crystal in the cholesteric liquid crystal layer 13 to rotate and remain stationary 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 electrical signal V3 is applied to the first pixel electrode 121. There is a voltage difference (e.g., 16V) between the third electrical signal V3 and the common voltage signal Vcom. The third electrical signal V3 directly becomes the same as the common voltage signal Vcom at a second preset time. The second preset time is shorter than the first preset time; that is, the third electrical signal V3 initially has a large voltage difference with the common voltage signal Vcom, and then rapidly decreases to become the same as the common voltage signal Vcom. Therefore, a strong vertical electric field is initially formed between the first common electrode 111 and the first pixel electrode 121. This vertical electric field then rapidly disappears, causing the cholesteric liquid crystal in the cholesteric liquid crystal layer 13 to rotate and remain stationary in the P state, which is a reflecting state. Different arrangement directions of the cholesteric liquid crystal result in different reflected visible light spectra, while the remaining spectrum is transmitted. The reflectance spectral band (Δλ) of cholesteric liquid crystals is proportional to the pitch (Po) and birefringence (Δn = ne - no) of the cholesteric liquid crystal, with the formula: Δλ = PoΔn. Therefore, cholesteric liquid crystals with different pitches can reflect different colors of light in the reflective state. The P state and FC state do not require voltage to maintain.

[0051] like Figure 2As shown, the first array substrate 12 is provided with multiple first scan lines 101, multiple first data lines 102, and multiple first thin-film transistors 103. The first array substrate 12 provides a first pixel electrode 121 and a first thin-film transistor 103 in the region corresponding to each first pixel unit P1. 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 on the same layer and electrically connected. The first gate and the first active layer are isolated 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.

[0052] The e-ink screen 20 includes a second opposing substrate 21, a second array substrate 22 disposed opposite to the second opposing substrate 21, and ink capsules 23 located between the second opposing substrate 21 and the second array substrate 22. Each ink capsule 23 contains black ink particles 231 and second-color ink particles 232 of opposite polarities. The second-color ink particles 232 reflect light of a second color. The second opposing substrate 21 is located on the side of the e-ink screen 20 closest to the liquid crystal cell 10, and the second array substrate 22 is located on the side of the e-ink screen 20 furthest from the liquid crystal cell 10. By providing electric fields of 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, if the black ink particles 231 are negatively charged and the second-color ink particles 232 are positively charged, 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 upward-facing electric field is provided, the second-color ink particle 232 moves upward, and the black ink particle 231 moves downward; if a downward-facing electric field is provided, the second-color ink particle 232 moves downward, and the black ink particle 231 moves upward. Alternatively, the black ink particle 231 can be positively charged, and the second-color ink particle 232 negatively charged, causing the black ink particle 231 to move in the direction of the electric field, and the second-color ink particle 232 to move in the opposite direction of the electric field.

[0053] The second array substrate 22 is provided with a second pixel electrode 221, which corresponds one-to-one with the second pixel unit P2. The second opposing substrate 21 is provided with a second common electrode 211 that cooperates with the second pixel electrode 221. The second pixel electrode 221 is a block electrode corresponding to the second pixel unit P2, and the second common electrode 211 is a planar electrode that covers the entire surface of the second opposing substrate 21. By controlling the voltage polarity on the second pixel electrode 221, the electric field direction between the second pixel electrode 221 and the second common electrode 211 is controlled, thereby controlling the ink capsule 23 to switch between a black state (light-absorbing state) and a second color state. For example, if a 0V common voltage is applied to the second common electrode 211, and a positive voltage is applied to the second pixel electrode 221, the electric field direction between the second pixel electrode 221 and the second common electrode 211 is upward; if a negative voltage is applied to the second pixel electrode 221, the electric field direction between the second pixel electrode 221 and the second common electrode 211 is downward.

[0054] like Figure 3 As shown, the second array substrate 22 is provided with multiple second scan lines 201, multiple second data lines 202, and multiple second thin-film transistors 203. The second array substrate 22 provides a second pixel electrode 221 and a second thin-film transistor 203 in the region corresponding to each second pixel unit P2. The second pixel electrode 221 is electrically connected to the second scan line 201 and the second data line 202 adjacent to the second thin-film transistor 203 through the second thin-film transistor 203. The second thin-film transistor 203 includes a second gate, a second active layer, a second drain, and a second source. The second gate and the second scan line 201 are located on the same layer and electrically connected. The second gate and the second active layer are isolated by an insulating layer. The second source is electrically connected to the second data line 202, and the second drain is electrically connected to the second pixel electrode 221 through a contact hole.

[0055] The first opposing substrate 11, the first array substrate 12, the second opposing substrate 21, and the second array substrate 22 can 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 can be made of transparent electrodes such as indium tin oxide (ITO) or indium zinc oxide (IZO).

[0056] In this embodiment, the first color and the second color are complementary colors. The light of the first color and the light of the second color mix to form white light. Optionally, the first color is cyan, and the second color is red. That is, all the cholesteric liquid crystal layers 13 reflect cyan light in the reflective state, and the second color ink particles 232 are red ink particles used to reflect red light. When the pixel displays white, the cholesteric liquid crystal layer 13 in the corresponding area of ​​the pixel is controlled to be in a reflective state and reflect cyan light, and the red ink particles in the ink capsule 23 in the corresponding area of ​​the pixel are controlled to concentrate near the second common electrode 211 and reflect red light. White light is formed by the mixing of cyan and red light.

[0057] This embodiment also provides a driving method for driving the reflective display panel described above. The following description uses an example of black ink particles 231 being negatively charged and second-color ink particles 232 being positively charged. The driving method includes:

[0058] Figure 6 This is one of the structural schematic diagrams of the reflective display panel in the black state in Embodiment 1 of the present invention. Figure 7 This is the second schematic diagram of the reflective display panel in the black state in Embodiment 1 of the present invention. Figure 6 and Figure 7 As shown, when a pixel displays black, the cholesteric liquid crystal layer 13 in the corresponding area of ​​the pixel is in a hazy state. Figure 6 or light-transmitting state ( Figure 7 The black ink particles 231 in the ink capsule 23 corresponding to the pixel area are concentrated near the second common electrode 211. Light transmitted through the liquid crystal cell 10 is absorbed by the black ink particles 231, thus appearing black. Specifically, as Figure 6 As shown and referenced Figure 5 A common voltage signal Vcom is applied to the first common electrode 111, and a second electrical signal V2 is applied to the first pixel electrode 121. There is a voltage difference (e.g., 16V) between the second electrical signal V2 and the common voltage signal Vcom. The second electrical signal V2 gradually becomes the same as the common voltage signal Vcom within a first preset time period; that is, the second electrical signal V2 initially has a large voltage difference with the common voltage signal Vcom, and then slowly decreases to become the same as the common voltage signal Vcom. Therefore, a strong vertical electric field is initially formed between the first common electrode 111 and the first pixel electrode 121, and then the vertical electric field slowly disappears, causing the cholesterol liquid crystal in the cholesterol liquid crystal layer 13 to rotate and remain stationary in the FC state. This is a scattering state and has a light-scattering effect; or, as... Figure 7 As shown and referenced Figure 5A common voltage signal Vcom is applied to the first common electrode 111, and a first electrical signal V1 is continuously applied to the first pixel electrode 121. There is a voltage difference (e.g., 16V) between the common voltage signal Vcom and the first electrical signal V1. A strong vertical electric field is formed between the first common electrode 111 and the first pixel electrode 121. The cholesteric liquid crystal in the cholesteric liquid crystal layer 13 rotates and stagnates in the H state (transparent state). A common voltage of 0V is applied to the second common electrode 211, and a negative voltage (e.g., -15V) is applied to the second pixel electrode 221. The electric field direction between the second pixel electrode 221 and the second common electrode 211 is downward. The second color ink particles 232 move downward, and the black ink particles 231 move upward and concentrate near the second common electrode 211. The light transmitted through the liquid crystal cell 10 is absorbed by the black ink particles 231, thus appearing black.

[0059] When a pixel displays color, the cholesteric liquid crystal layer 13 in the corresponding area of ​​the pixel is controlled to be in a reflective state and reflect light of the first color, and the black ink particles 231 in the ink capsule 23 in the corresponding area of ​​the pixel are controlled to concentrate on the side near the second common electrode 211, at which time the pixel displays the first color. Figure 1 As shown and referenced Figure 5 Specifically, a common voltage signal Vcom is applied to the first common electrode 111, and a third electrical signal V3 is applied to the first pixel electrode 121. There is a voltage difference (e.g., 16V) between the third electrical signal V3 and the common voltage signal Vcom. The third electrical signal V3 directly becomes the same as the common voltage signal Vcom at a second preset time. The second preset time is shorter than the first preset time; that is, the third electrical signal V3 initially has a large voltage difference with the common voltage signal Vcom, and then rapidly decreases to become the same as the common voltage signal Vcom. Therefore, a strong vertical electric field is initially formed between the first common electrode 111 and the first pixel electrode 121, and then the vertical electric field rapidly disappears, causing the cholesterol liquid crystal in the cholesterol liquid crystal layer 13 to rotate and remain in the P state, which is a reflective state and reflects the light of the first color. When a 0V common voltage is applied to the second common electrode 211 and a negative voltage (e.g., -15V) is applied to the second pixel electrode 221, the electric field between the second pixel electrode 221 and the second common electrode 211 is directed downwards. As a result, the second color ink particles 232 move downwards, and the black ink particles 231 move upwards and concentrate on the side close to the second common electrode 211. Other light passing through the liquid crystal cell 10 is absorbed by the black ink particles 231, thereby making the pixel display the first color.

[0060] Figure 8 This is one of the structural schematic diagrams of the reflective display panel in Embodiment 1 of the present invention when reflecting a second color light; Figure 9This is the second schematic diagram of the reflective display panel in Embodiment 1 of the present invention when reflecting a second color of light. For example... Figure 8 and Figure 9 As shown, when a pixel displays color, the cholesteric liquid crystal layer 13 in the corresponding area of ​​the pixel can also be controlled to be in a hazy state. Figure 8 or light-transmitting state ( Figure 9 The second-color ink particles 232 in the ink capsule 23 corresponding to the pixel area are concentrated near the second common electrode 211 and reflect the second-color light, at which time the pixel displays the second color. Specifically, as shown in the figure... Figure 8 As shown and referenced Figure 5 A common voltage signal Vcom is applied to the first common electrode 111, and a second electrical signal V2 is applied to the first pixel electrode 121. There is a voltage difference (e.g., 16V) between the second electrical signal V2 and the common voltage signal Vcom. The second electrical signal V2 gradually becomes the same as the common voltage signal Vcom within a first preset time period; that is, the second electrical signal V2 initially has a large voltage difference with the common voltage signal Vcom, and then slowly decreases to become the same as the common voltage signal Vcom. Therefore, a strong vertical electric field is initially formed between the first common electrode 111 and the first pixel electrode 121, and then the vertical electric field slowly disappears, causing the cholesterol liquid crystal in the cholesterol liquid crystal layer 13 to rotate and remain stationary in the FC state. This is a scattering state and has a light-scattering effect; or, as... Figure 9 As shown and referenced Figure 5 A common voltage signal Vcom is applied to the first common electrode 111, and a first electrical signal V1 is continuously applied to the first pixel electrode 121. There is a voltage difference (e.g., 16V) between the common voltage signal Vcom and the first electrical signal V1. A strong vertical electric field is formed between the first common electrode 111 and the first pixel electrode 121. The cholesteric liquid crystal in the cholesteric liquid crystal layer 13 rotates and stagnates in the H state (transparent state). A common voltage of 0V is applied to the second common electrode 211, and a positive voltage (e.g., +15V) is applied to the second pixel electrode 221. The electric field direction between the second pixel electrode 221 and the second common electrode 211 is upward. The black ink particles 231 move downward, and the second color ink particles 232 move upward and concentrate near the second common electrode 211. Other light passing through the liquid crystal cell 10 is reflected by the second color ink particles 232, thereby making the pixel display the second color. In the FC state, the cholesterol liquid crystal layer 13 scatters the light reflected by the second color ink particles 232, presenting a diffuse reflection effect to improve the display effect.

[0061] Figure 10 This is a schematic diagram of the reflective display panel in Embodiment 1 of the present invention when reflecting white light. Figure 10As shown, when a pixel displays white, the cholesteric liquid crystal layer 13 in the corresponding area of ​​the pixel is controlled to be in a reflective state and reflect light of the first color, and the second color ink particles 232 in the ink capsule 23 in the corresponding area of ​​the pixel are controlled to concentrate on the side near the second common electrode 211 and reflect light of the second color. White light is formed by the mixing of the first color light and the second color light. Specifically, as Figure 10 As shown and referenced Figure 5 A common voltage signal Vcom is applied to the first common electrode 111, and a third electrical signal V3 is applied to the first pixel electrode 121. There is a voltage difference (e.g., 16V) between the third electrical signal V3 and the common voltage signal Vcom. The third electrical signal V3 directly becomes the same as the common voltage signal Vcom at a second preset time. The second preset time is shorter than the first preset time; that is, the third electrical signal V3 initially has a large voltage difference with the common voltage signal Vcom, and then rapidly decreases to become the same as the common voltage signal Vcom. Therefore, a strong vertical electric field is initially formed between the first common electrode 111 and the first pixel electrode 121, and then the vertical electric field rapidly disappears, causing the cholesterol liquid crystal in the cholesterol liquid crystal layer 13 to rotate and stagnate in the P state, which is a reflective state and reflects the light of the first color. When a 0V common voltage is applied to the second common electrode 211 and a positive voltage (e.g., +15V) is applied to the second pixel electrode 221, the electric field between the second pixel electrode 221 and the second common electrode 211 is directed upwards. As a result, the black ink particles 231 move downwards, and the second color ink particles 232 move upwards and concentrate near the second common electrode 211. Other light passing through the liquid crystal cell 10 is reflected by the second color ink particles 232, and the light of the first color and the light of the second color mix to form white light.

[0062] Figure 11 This is one of the structural schematic diagrams of the reflective display panel in color display according to Embodiment 1 of the present invention. Figure 12 This is the second schematic diagram of the reflective display panel in color display according to Embodiment 1 of the present invention. Figure 11 and Figure 12 As shown, when a reflective display panel displays a color image, different pixels present their respective corresponding colors, such as black, white, a first color, and a second color, thus presenting a color image. The grayscale brightness of the corresponding pixel can be controlled by changing the voltage on the first pixel electrode 121 and / or the second pixel electrode 221.

[0063] [Example 2]

[0064] Figure 13 This is a schematic diagram of the reflective display panel in color display according to Embodiment 2 of the present invention. Figure 14This is the second schematic diagram of the reflective display panel in color display according to Embodiment 2 of the present invention. Figure 13 and Figure 14 As shown, the reflective display panel and driving method provided in Embodiment 2 of the present invention are the same as those in Embodiment 1. Figures 1 to 12 The reflective display panel and driving method are basically the same as those in the previous embodiment, except that in this embodiment:

[0065] like Figure 13 As shown, the first color is purple, and the second color is green. That is, all the cholesteric liquid crystal layers 13 reflect purple light in the reflective state, and the second-color ink particles 232 are green ink particles used to reflect green light. When a pixel displays white, the cholesteric liquid crystal layer 13 in the corresponding area of ​​the pixel is controlled to be in a reflective state and reflect purple light, and the green ink particles in the ink capsules 23 in the corresponding area of ​​the pixel are controlled to concentrate near the second common electrode 211 and reflect green light. White light is formed by the mixing of purple and green light.

[0066] like Figure 14 As shown, the first color is yellow, and the second color is blue. That is, all the cholesteric liquid crystal layers 13 reflect yellow light in their reflective state, and the second-color ink particles 232 are blue ink particles used to reflect blue light. When a pixel displays white, the cholesteric liquid crystal layer 13 in the corresponding area of ​​the pixel is controlled to be in a reflective state and reflect yellow light, and the blue ink particles in the ink capsules 23 in the corresponding area of ​​the pixel are controlled to concentrate near the second common electrode 211 and reflect blue light. White light is formed by the mixing of yellow and blue light. Of course, in other embodiments, other colors can also be used, so that the first-color light and the second-color light mix to form white light.

[0067] Those skilled in the art should understand that the remaining structures and working principles of this embodiment are the same as those of Embodiment 1, and will not be repeated here.

[0068] [Example 3]

[0069] Figure 15 This is a schematic diagram of the reflective display panel in color display according to Embodiment 3 of the present invention. Figure 15 As shown, the reflective display panel and driving method provided in Embodiment 3 of the present invention are the same as those in Embodiment 1. Figures 1 to 12 Example 2 Figures 13 to 14 The reflective display panel and driving method are basically the same as those in the previous embodiment, except that in this embodiment:

[0070] The first color is a monochromatic color (i.e., a single color, such as red, orange, yellow, green, cyan, blue, violet, etc.), and the second color is white. This means that all cholesteric liquid crystal layers 13 reflect monochromatic light in their reflective state, and the second-color ink particles 232 are white ink particles used to reflect white light. Therefore, when a pixel displays white, the cholesteric liquid crystal layer 13 in the corresponding area of ​​the pixel is controlled to be in a foggy or transparent state, and the white ink particles in the ink capsules 23 in the corresponding area of ​​the pixel are controlled to concentrate near the second common electrode 211 and reflect white light. The white light reflected directly from the white ink particles creates a white display.

[0071] This embodiment also provides a driving method for driving the reflective display panel described above. The following description uses an example where black ink particles 231 are negatively charged and second-color ink particles 232 are positively charged. The driving method includes:

[0072] like Figure 15 As shown in the first pixel from left to right, when the pixel displays black, the cholesteric liquid crystal layer 13 in the corresponding area of ​​the pixel is in a hazy state. Figure 15 The first pixel from left to right in the middle) or in a transparent state, and the black ink particles 231 in the ink capsule 23 controlling the corresponding area of ​​the pixel are concentrated on the side near the second common electrode 211. The light transmitted through the liquid crystal cell 10 is absorbed by the black ink particles 231, thus appearing black. Specifically, as Figure 15 The first pixel from left to right is shown in the image and referenced. Figure 5 A common voltage signal Vcom is applied to the first common electrode 111, and a second electrical signal V2 is applied to the first pixel electrode 121. There is a voltage difference (e.g., 16V) between the second electrical signal V2 and the common voltage signal Vcom. The second electrical signal V2 gradually becomes the same as the common voltage signal Vcom within a first preset time period; that is, the second electrical signal V2 initially has a large voltage difference with the common voltage signal Vcom, and then slowly decreases to become the same as the common voltage signal Vcom. Therefore, a strong vertical electric field is initially formed between the first common electrode 111 and the first pixel electrode 121, and then the vertical electric field slowly disappears, causing the cholesterol liquid crystal in the cholesterol liquid crystal layer 13 to rotate and remain in the FC state, which is a scattering state and has a light-scattering effect; or, refer to... Figure 5A common voltage signal Vcom is applied to the first common electrode 111, and a first electrical signal V1 is continuously applied to the first pixel electrode 121. There is a voltage difference (e.g., 16V) between the common voltage signal Vcom and the first electrical signal V1. A strong vertical electric field is formed between the first common electrode 111 and the first pixel electrode 121. The cholesteric liquid crystal in the cholesteric liquid crystal layer 13 rotates and stagnates in the H state (transparent state). A common voltage of 0V is applied to the second common electrode 211, and a negative voltage (e.g., -15V) is applied to the second pixel electrode 221. The electric field direction between the second pixel electrode 221 and the second common electrode 211 is downward. The second color ink particles 232 move downward, and the black ink particles 231 move upward and concentrate near the second common electrode 211. The light transmitted through the liquid crystal cell 10 is absorbed by the black ink particles 231, thus appearing black.

[0073] When a pixel displays color, the cholesteric liquid crystal layer 13 in the corresponding area of ​​the pixel is controlled to be in a reflective state and reflect light of the first color, and the black ink particles 231 in the ink capsule 23 in the corresponding area of ​​the pixel are controlled to concentrate on the side near the second common electrode 211, at which time the pixel displays the first color. Figure 15 The second pixel from the left in the middle is shown and referenced. Figure 5 Specifically, a common voltage signal Vcom is applied to the first common electrode 111, and a third electrical signal V3 is applied to the first pixel electrode 121. There is a voltage difference (e.g., 16V) between the third electrical signal V3 and the common voltage signal Vcom. The third electrical signal V3 directly becomes the same as the common voltage signal Vcom at a second preset time. The second preset time is shorter than the first preset time; that is, the third electrical signal V3 initially has a large voltage difference with the common voltage signal Vcom, and then rapidly decreases to become the same as the common voltage signal Vcom. Therefore, a strong vertical electric field is initially formed between the first common electrode 111 and the first pixel electrode 121, and then the vertical electric field rapidly disappears, causing the cholesterol liquid crystal in the cholesterol liquid crystal layer 13 to rotate and remain in the P state, which is a reflective state and reflects the light of the first color. When a 0V common voltage is applied to the second common electrode 211 and a negative voltage (e.g., -15V) is applied to the second pixel electrode 221, the electric field between the second pixel electrode 221 and the second common electrode 211 is directed downwards. As a result, the second color ink particles 232 move downwards, and the black ink particles 231 move upwards and concentrate on the side close to the second common electrode 211. Other light passing through the liquid crystal cell 10 is absorbed by the black ink particles 231, thereby making the pixel display the first color.

[0074] like Figure 15 As shown in the 3rd and 4th pixels from left to right, when displaying color, the cholesteric liquid crystal layer 13 in the corresponding area of ​​the pixel can also be controlled to be in a hazy state. Figure 15 The third pixel from left to right) or in a transparent state ( Figure 15 The fourth pixel from left to right, and the second-color ink particles 232 in the ink capsule 23 controlling the corresponding area of ​​the pixel are concentrated on the side near the second common electrode 211 and reflect the second-color light, at which time the pixel presents the second color. Specifically, as shown in the figure... Figure 15 The third pixel from left to right is shown in the image and referenced. Figure 5 A common voltage signal Vcom is applied to the first common electrode 111, and a second electrical signal V2 is applied to the first pixel electrode 121. There is a voltage difference (e.g., 16V) between the second electrical signal V2 and the common voltage signal Vcom. The second electrical signal V2 gradually becomes the same as the common voltage signal Vcom within a first preset time period; that is, the second electrical signal V2 initially has a large voltage difference with the common voltage signal Vcom, and then slowly decreases to become the same as the common voltage signal Vcom. Therefore, a strong vertical electric field is initially formed between the first common electrode 111 and the first pixel electrode 121, and then the vertical electric field slowly disappears, causing the cholesterol liquid crystal in the cholesterol liquid crystal layer 13 to rotate and remain stationary in the FC state. This is a scattering state and has a light-scattering effect; or, as... Figure 15 The fourth pixel from left to right is shown in the image and referenced. Figure 5 A common voltage signal Vcom is applied to the first common electrode 111, and a first electrical signal V1 is continuously applied to the first pixel electrode 121. There is a voltage difference (e.g., 16V) between the common voltage signal Vcom and the first electrical signal V1. A strong vertical electric field is formed between the first common electrode 111 and the first pixel electrode 121. The cholesteric liquid crystal in the cholesteric liquid crystal layer 13 rotates and stagnates in the H state (transparent state). A common voltage of 0V is applied to the second common electrode 211, and a positive voltage (e.g., +15V) is applied to the second pixel electrode 221. The electric field direction between the second pixel electrode 221 and the second common electrode 211 is upward. The black ink particles 231 move downward, and the second color ink particles 232 move upward and concentrate near the second common electrode 211. Other light passing through the liquid crystal cell 10 is reflected by the second color ink particles 232, thereby making the pixel appear the second color, i.e., white. In this embodiment, the cholesteric liquid crystal layer 13, when in the FC state, scatters the light reflected by the second-color ink particles 232, exhibiting a diffuse reflection effect to improve the display effect. Therefore, in this embodiment, white display is achieved directly through the white light reflected by the white ink particles.

[0075] In this reflective display panel, when displaying a color image, different pixels present their respective corresponding colors, such as black, a first color, and a second color (white), thus presenting a color image. The grayscale brightness of the corresponding pixel can be controlled by changing the voltage on the first pixel electrode 121 and / or the second pixel electrode 221.

[0076] Those skilled in the art should understand that the remaining structures and working principles of this embodiment are the same as those of Embodiment 1 and Embodiment 2, and will not be repeated here.

[0077] [Example 4]

[0078] Figure 16 This is one of the structural schematic diagrams of the reflective display panel in the fourth embodiment of the present invention when it is mirrored. Figure 17 This is a schematic diagram of the structure of the first side electrode and the second side electrode in Embodiment 4 of the present invention. Figure 18 This is the second schematic diagram of the reflective display panel in Embodiment 4 of the present invention during specular reflection. Figures 16 to 17 As shown, the reflective display panel and driving method provided in Embodiment 4 of the present invention are the same as those in Embodiment 1. Figures 1 to 12 Example 2 Figures 13 to 14 Example 3 Figure 15 The reflective display panel and driving method are basically the same as those in the previous embodiment, except that in this embodiment:

[0079] The second pixel electrode 221 is a reflective electrode with a reflective function. A first side electrode 241 and a second side electrode 242, parallel to each other, are disposed between the second opposing substrate 21 and the second array substrate 22. The first side electrode 241 and the second side electrode 242 are alternately arranged, and the ink capsule 23 is located between adjacent first side electrodes 241 and second side electrodes 242. By providing electric fields in different directions to the ink capsule 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, causing the second color ink particles 232 to move in the direction of the electric field, and the black ink particles 231 to move in the opposite direction of the electric field. If an electric field is provided in the left direction, the second color ink particles 232 move in the left direction, and the black ink particles 231 move in the right direction; if an electric field is provided in the right direction, the second color ink particles 232 move in the right direction, and the black ink particles 231 move in the left direction. Alternatively, the black ink particles 231 can be positively charged and the second-color ink particles 232 negatively charged, causing the black ink particles 231 to move in the direction of the electric field and the second-color ink particles 232 to move in the opposite direction of the electric field. By applying corresponding voltages to the first side electrode 241 and the second side electrode 242, the ink capsule 23 can be controlled to be transparent, allowing light to pass through the ink capsule 23 and be reflected back by the second pixel electrode 221.

[0080] like Figure 17 As shown, the second opposing substrate 21 or the second array substrate 22 is provided with a first electrode line 243 and a second electrode line 244 arranged opposite to each other. All the first side electrodes 241 are connected to the first electrode line 243, and all the second side electrodes 242 are connected to the second electrode line 244, so that all ink capsules 23 can be controlled to be transparent at the same time.

[0081] This embodiment also provides a driving method for driving the reflective display panel described above. The following description uses an example where black ink particles 231 are negatively charged and second-color ink particles 232 are positively charged. The driving methods for the pixels when displaying black, color, and white are basically the same as in Embodiments 1, 2, and 3, except that when the pixels display black, color, and white, no voltage is applied to the first side electrode 241 and the second side electrode 242; they are in an open-circuit state. Based on this, the driving method in this application further includes:

[0082] When the reflective display panel undergoes specular reflection, all cholesteric liquid crystal layers 13 are controlled to be in a foggy state. Figure 18 or light-transmitting state ( Figure 16The system controls the black ink particles 231 and the second-color ink particles 232 in the ink capsules 23 to concentrate on the left and right sides of the ink capsules 23, respectively. Light passes sequentially through the cholesteric liquid crystal layer 13 and the ink capsules 23, and is reflected back by the second pixel electrode 221, thus achieving a mirror reflection effect and functioning as a reflector. Specifically, as... Figure 18 As shown and referenced Figure 5 A common voltage signal Vcom is applied to the first common electrode 111, and a second electrical signal V2 is applied to the first pixel electrode 121. There is a voltage difference (e.g., 16V) between the second electrical signal V2 and the common voltage signal Vcom. The second electrical signal V2 gradually becomes the same as the common voltage signal Vcom within a first preset time period; that is, the second electrical signal V2 initially has a large voltage difference with the common voltage signal Vcom, and then slowly decreases to become the same as the common voltage signal Vcom. Therefore, a strong vertical electric field is initially formed between the first common electrode 111 and the first pixel electrode 121, and then the vertical electric field slowly disappears, causing the cholesterol liquid crystal in the cholesterol liquid crystal layer 13 to rotate and remain stationary in the FC state. This is a scattering state and has a light-scattering effect; or, as... Figure 16 As shown and referenced Figure 5 A common voltage signal Vcom is applied to the first common electrode 111, and a first electrical signal V1 is continuously applied to the first pixel electrode 121. A voltage difference (e.g., 16V) exists between the common voltage signal Vcom and the first electrical signal V1, creating a strong vertical electric field between the first common electrode 111 and the first pixel electrode 121. The cholesteric liquid crystal in the cholesteric liquid crystal layer 13 rotates and remains stationary in the H state (transparent state). No voltage is applied to any of the second common electrodes 211 and the second pixel electrode 221, resulting in an open circuit. Voltages of opposite polarities are applied to the first side electrode 241 and the second side electrode 242. A negative voltage is applied to all the first side electrodes 241, and a positive voltage is applied to all the second side electrodes 242. The electric field direction between the first side electrodes 241 and the second side electrodes 242 is from the second side electrode 242 towards the first side electrode 241. Consequently, the second color ink particles 232 move towards the first side electrode 241, and the black ink particles 231 move towards the second side electrode 242, making the ink capsule 23 transparent. Light passes sequentially through the cholesteric liquid crystal layer 13 and the ink capsule 23, and is reflected back by the second pixel electrode 221, thus achieving a specular reflection effect and functioning as a mirror. Specifically, when the cholesteric liquid crystal layer 13 is in the FC state, it scatters the light reflected from the second pixel electrode 221, resulting in a diffuse reflection effect. Of course, a positive voltage can also be applied to all the first side electrodes 241, and a negative voltage can be applied to all the second side electrodes 242.

[0083] Those skilled in the art should understand that the remaining structures and working principles of this embodiment are the same as those of Embodiment 1, Embodiment 2, and Embodiment 3, and will not be repeated here.

[0084] In this document, the directional terms such as up, down, left, right, front, and back are defined according to the position of the structures in the accompanying drawings and the relative positions of the structures, and are only used for clarity and convenience in expressing the technical solution. It should be understood that the use of these directional terms should not limit the scope of protection claimed in this application. It should also be understood that the terms "first" and "second," etc., used herein are only used for distinction in name and are not used to limit the number or order.

[0085] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content without departing from the scope of the technical solution of the present invention, which are equivalent embodiments with equivalent changes. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the technical solution of the present invention shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. A reflective display panel, characterized in that, Includes a liquid crystal cell (10) and an electronic ink screen (20) stacked on the underside of the liquid crystal cell (10); The liquid crystal cell (10) includes a first opposing substrate (11), a first array substrate (12) disposed opposite to the first opposing substrate (11), and a cholesteric liquid crystal layer (13) located between the first opposing substrate (11) and the first array substrate (12). All of the cholesteric liquid crystal layers (13) reflect light of the first color in the reflective state. The first array substrate (12) is provided with a first pixel electrode (121), and the first opposing substrate (11) is provided with a first common electrode (111) that cooperates with the first pixel electrode (121). The electronic ink screen (20) includes a second opposing substrate (21), a second array substrate (22) disposed 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 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. The second array substrate (22) is provided with a second pixel electrode (221), and the second opposing substrate (21) is provided with a second common electrode (211) that cooperates with the second pixel electrode (221). A first side electrode (241) and a second side electrode (242) are provided between the second opposing substrate (21) and the second array substrate (22), and the first side electrode (241) and the second side electrode (242) are alternately arranged. The ink capsule (23) is located between adjacent first side electrodes (241) and second side electrodes (242). A first electrode line (243) and a second electrode line (244) are provided on the second opposing substrate (21) or the second array substrate (22), and all the first side electrodes (241) are connected to the first electrode line (243). All the second side electrodes (242) are connected to the second electrode line (244). The second pixel electrode (221) is a reflective electrode with a reflective effect. When the reflective display panel is mirror-reflected, all the cholesterol liquid crystal layers (13) are in a foggy or transparent state, and the black ink particles (231) and the second color ink particles (232) in all the ink capsules (23) are concentrated on the left and right sides of the ink capsules (23).

2. The reflective display panel according to claim 1, characterized in that, The first color and the second color are complementary colors. The light of the first color and the light of the second color mix to form white light.

3. The reflective display panel according to claim 2, characterized in that, The first color is cyan and the second color is red; or the first color is purple and the second color is green; or the first color is yellow and the second color is blue.

4. The reflective display panel according to claim 1, characterized in that, The first color is a single color, and the second color is white.

5. The reflective display panel according to any one of claims 1-4, characterized in that, The liquid crystal cell (10) has a plurality of first pixel units (P1) arranged in an array, and the electronic ink screen (20) has a plurality of second pixel units (P2) arranged in an array, with the first pixel unit (P1) and the second pixel unit (P2) corresponding one-to-one.

6. A driving method for a reflective display panel, characterized in that, The driving method for driving the reflective display panel as described in any one of claims 1-5 includes: When a pixel displays black, the cholesterol liquid crystal layer (13) in the area corresponding to the pixel is controlled to be in a foggy or transparent state, and the black ink particles (231) in the ink capsule (23) in the area corresponding to the pixel are controlled to concentrate on the side close to the second common electrode (211). When a pixel displays color, the cholesteric 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 the ink capsule (23) in the area corresponding to the pixel are controlled to be concentrated on the side close to the second common electrode (211); or, the cholesteric liquid crystal layer (13) in the area corresponding to the pixel is controlled to be in a foggy or transparent state, and 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 side close to the second common electrode (211) and reflect light of the second color.

7. The driving method for a reflective display panel according to claim 6, characterized in that, The first color and the second color are complementary colors. The light of the first color and the light of the second color mix to form white light. The driving method includes: When a pixel displays white, 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 ink particles (232) of the second color in the ink capsule (23) in the area corresponding to the pixel are controlled to concentrate on the side close to the second common electrode (211) and reflect light of the second color.

8. The driving method for a reflective display panel according to claim 6, characterized in that, The first color is a single color, the second color is white, and the driving method includes: When a pixel displays white, the cholesterol liquid crystal layer (13) in the area corresponding to the pixel is controlled to be in a foggy or transparent state, and the second color ink particles (232) in the ink capsule (23) in the area corresponding to the pixel are controlled to concentrate on the side close to the second common electrode (211) and reflect the second color light.

9. The driving method for a reflective display panel according to any one of claims 6-8, characterized in that, A first side electrode (241) and a second side electrode (242) are provided between the second opposing substrate (21) and the second array substrate (22), which are parallel to each other. The first side electrode (241) and the second side electrode (242) are alternately arranged. The ink capsule (23) is located between adjacent first side electrodes (241) and second side electrodes (242). The second pixel electrode (221) is a reflective electrode with a reflective function. The driving method includes: When the reflective display panel is mirror-reflected, it controls all the cholesterol liquid crystal layers (13) to be in a foggy or transparent state, and controls all the black ink particles (231) and the second color ink particles (232) in the ink capsules (23) to be concentrated on the left and right sides of the ink capsules (23), respectively.

Images