Reflective display device and driving method

Abstract

A reflective display device and a driving method. The reflective display device comprises: a plurality of reflective display panels (10, 20, 30) stacked on top of one another, each reflective display panel (10, 20, 30) having a data line; and a data driving chip (41) and a data signal distributor (42), the data driving chip (41) being electrically connected to the data signal distributor (42) and used for inputting a data driving signal to the data signal distributor (42), the data lines on the plurality of reflective display panels (10, 20, 30) being electrically connected to the same data signal distributor, and the data signal distributor (42) being used for distributing the data driving signal to the data lines on the corresponding reflective display panels (10, 20, 30). The plurality of reflective display panels (10, 20, 30) share a data signal distributor (42), and the data signal distributor (42) can allocate to the data lines on the corresponding reflective display panels (10, 20, 30) the data driving signal input by the data driving chip (41), so that the plurality of reflective display panels (10, 20, 30) can share the data driving chip (41), thereby reducing the number of data driving chips (41) and reducing manufacturing costs.

Description

Reflective display device and driving method Technical Field

[0001] This invention relates to the field of display technology, and in particular to a reflective display device and a driving method thereof. 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. Technical issues

[0004] Existing technologies employ cholesteric liquid crystal reflective displays. Due to the pitch requirements of cholesteric liquid crystals, a cholesteric liquid crystal with a specific pitch can only reflect one color while transmitting other colors of light. To achieve full-color reflective display, a three-layer liquid crystal cell architecture is required, utilizing the color mixing principle of the three layers. Since each of the three liquid crystal cells needs to control different reflection states, most existing liquid crystal cells are packaged in COG (Chip On Glass), COF (Chip On Flex, or Chip On Film, etc.). This necessitates three scan driver chips and three data driver chips for control, hindering product miniaturization and increasing manufacturing costs. Furthermore, because different color images need to be displayed, the grayscale signals on each liquid crystal cell are different. Therefore, reducing the number of data driver chips is a significant challenge in this field. Technical solutions

[0005] In order to overcome the shortcomings and deficiencies of the prior art, the present invention aims to provide a reflective display device and a driving method to solve the problems of the large number of driving chips and high cost used in the prior art for reflective display devices.

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

[0007] This invention provides a reflective display device, comprising:

[0008] Multiple reflective display panels are stacked on top of each other, and each of the reflective display panels has a data line;

[0009] A data driver chip and a data signal distributor are provided. The data driver chip is electrically connected to the data signal distributor and is used to input a data driving signal to the data signal distributor. The data lines on the plurality of reflective display panels are all electrically connected to the same data signal distributor. The data signal distributor is used to distribute the data driving signal to the corresponding data line on the reflective display panel.

[0010] Furthermore, among the plurality of reflective display panels, the one furthest from the external environment is a cholesteric liquid crystal reflective display panel or an electrophoretic reflective display panel, and the remaining reflective display panels are all cholesteric liquid crystal reflective display panels.

[0011] Furthermore, the number of reflective display panels is three, and the three reflective display panels are arranged sequentially as a first reflective display panel, a second reflective display panel, and a third reflective display panel in the direction facing the external environment. When in reflective state, the first reflective display panel, the second reflective display panel, and the third reflective display panel reflect a first color light, a second color light, and a third color light, respectively. The first color light, the second color light, and the third color light are one of red light, blue light, and green light, respectively.

[0012] Furthermore, the reflective display device includes a data signal circuit board, one end of which is electrically connected to the data signal distributor, and the other end of which is electrically connected to the data line on the reflective display panel.

[0013] Furthermore, the data signal circuit board is provided with multiple data signal branch circuit boards, and the data signal branch circuit boards are electrically connected to the reflective display panel one by one.

[0014] Alternatively, there may be multiple data signal circuit boards, each electrically connected to a corresponding reflective display panel.

[0015] Furthermore, each of the reflective display panels has scanning lines, and the reflective display device includes:

[0016] The system includes a scan driver chip and a scan signal distributor. The scan driver chip is electrically connected to the scan signal distributor and is used to input scan drive signals to the scan signal distributor. The scan lines on multiple reflective display panels are all electrically connected to the same scan signal distributor. The scan signal distributor is used to distribute the scan drive signals to the corresponding scan lines on the reflective display panels.

[0017] Furthermore, the reflective display device includes a scanning signal circuit board, one end of which is electrically connected to the scanning signal distributor, and the other end of which is electrically connected to the scanning line on the reflective display panel.

[0018] Furthermore, the scanning signal circuit board is provided with multiple scanning signal branch circuit boards, and the scanning signal branch circuit boards are connected to the reflective display panel one by one;

[0019] Alternatively, there may be multiple scanning signal circuit boards, each of which is electrically connected to the reflective display panel in a one-to-one correspondence.

[0020] Furthermore, each of the reflective display panels has scanning lines, and the reflective display device includes:

[0021] Multiple scan driver chips are provided, each electrically connected to a corresponding reflective display panel. Each scan driver chip is used to directly input the scan drive signal to the corresponding scan line on the reflective display panel.

[0022] Furthermore, the reflective display device also includes a color correction circuit, which is electrically connected to the data signal distributor and is used to adjust the color output of each of the reflective display panels.

[0023] This application also provides a driving method for a reflective display device, used to drive the reflective display device as described above, the driving method comprising:

[0024] The data driver chip inputs a data driver signal to the data signal distributor;

[0025] The data signal distributor is controlled to distribute the corresponding data drive signal to the data lines on each of the reflective display panels.

[0026] Furthermore, the driving method includes: controlling the data signal distributor to simultaneously distribute the corresponding data driving signal to the data lines on each of the reflective display panels;

[0027] Alternatively, the data signal distributor can be controlled to sequentially distribute the corresponding data drive signals to the data lines on each of the reflective display panels.

[0028] Furthermore, each of the reflective display panels has a scanning line, and the reflective display device includes a scanning driver chip and a scanning signal distributor. The scanning driver chip is electrically connected to the scanning signal distributor and is used to input a scanning driving signal to the scanning signal distributor. The scanning lines on multiple reflective display panels are all electrically connected to the same scanning signal distributor, and the scanning signal distributor is used to distribute the scanning driving signal to the corresponding scanning line on the reflective display panel.

[0029] The driving method includes:

[0030] When the data signal distributor is controlled to distribute the corresponding data driving signal to the data lines on each of the reflective display panels, the scan signal distributor is simultaneously controlled to distribute the corresponding scan driving signal to the scan lines on the reflective display panels that distribute the data driving signal.

[0031] Furthermore, each of the reflective display panels has a scanning line, and the reflective display device includes a plurality of scanning driving chips. The scanning driving chips are electrically connected to the reflective display panels one by one, and the scanning driving chips are used to input the scanning driving signal to the scanning line on the corresponding reflective display panel.

[0032] The driving method includes:

[0033] When the control data signal distributor distributes the corresponding data driving signal to the data lines on each of the reflective display panels, it simultaneously controls the corresponding scan driving chip to input the corresponding scan driving signal to the scan line on the reflective display panel that distributed the data driving signal.

[0034] Furthermore, the reflective display device also includes a color correction circuit, which is electrically connected to the data signal distributor and is used to adjust the color output of each of the reflective display panels;

[0035] The driving method includes:

[0036] Based on the color response range of each of the reflective display panels, the data driving signal is mapped to the color space of the reflective display device for compression or expansion processing. Based on the transition relationship between different colors, the parameters of the mapping algorithm are adjusted, and the data driving signal corresponding to each of the reflective display panels is adjusted by color interpolation or curve fitting.

[0037] Based on the color response characteristics and color space standards of each of the reflective display panels, a second difference adjustment is performed by calling a calibration curve or lookup table and dynamically adjusting the data driving signal corresponding to each of the reflective display panels.

[0038] The system acquires ambient light levels, monitors the color output brightness and color saturation of each of the reflective display panels, monitors the rate of change of color brightness and the rate of change of color protection in the color transition area, adjusts the data driving signal that exceeds a preset rate of change threshold, and performs a third differential adjustment on the data driving signal corresponding to each of the reflective display panels based on the standard parameters of the display mode of the reflective display device.

[0039] The color transition region of the data driving signal is determined, and the color gradient difference of the color transition region is weighted and corrected according to the color transition requirements of different color display regions. The color transition path is smoothed in the color space to perform a fourth difference adjustment on the data driving signal corresponding to each of the reflective display panels. Beneficial effects

[0040] By sharing a single data signal distributor among multiple reflective display panels, the data signal distributor can distribute the data driving signal input from the data driver chip to the data lines on the corresponding reflective display panel. This allows multiple reflective display panels to share the data driver chip, thereby reducing the number of data driver chips and lowering manufacturing costs. Attached Figure Description

[0041] Figure 1 is a schematic diagram of the planar structure of the reflective display device in Embodiment 1 of the present invention.

[0042] Figure 2 is a schematic diagram of the circuit structure of the data driving signal on the reflective display device in Embodiment 1 of the present invention.

[0043] Figure 3 is a schematic diagram of the circuit structure of the scanning drive signal on the reflective display device in Embodiment 1 of the present invention.

[0044] Figure 4 is a schematic diagram of the signal distributor in Embodiment 1 of the present invention.

[0045] Figure 5 is a structural schematic diagram of the reflective display device in the initial state according to Embodiment 1 of the present invention.

[0046] Figure 6 is a schematic diagram of the planar structure of the first array substrate in Embodiment 1 of the present invention.

[0047] Figure 7 is a schematic diagram of the planar structure of the second array substrate in Embodiment 1 of the present invention.

[0048] Figure 8 is a schematic diagram of the planar structure of the third array substrate in Embodiment 1 of the present invention.

[0049] Figure 9 is a schematic diagram illustrating the principle of the three state transformations of cholesteric liquid crystal in Embodiment 1 of the present invention.

[0050] Figure 10 is a schematic diagram of the driving signals for the three state transitions of the cholesteric liquid crystal in Embodiment 1 of the present invention.

[0051] Figure 11 is a schematic diagram of the structure of the reflective display device in Embodiment 1 of the present invention when displaying a red image.

[0052] Figure 12 is a schematic diagram of the structure of the reflective display device in Embodiment 1 of the present invention when displaying a green image.

[0053] Figure 13 is a schematic diagram of the structure of the reflective display device in Embodiment 1 of the present invention when displaying a blue image.

[0054] Figure 14 is a schematic diagram of the reflective display device in the white state in Embodiment 1 of the present invention.

[0055] Figure 15 is a schematic diagram of the reflective display device in the black state in Embodiment 1 of the present invention.

[0056] Figure 16 is a schematic diagram of the planar structure of the reflective display device in Embodiment 2 of the present invention.

[0057] Figure 17 is a schematic diagram of the circuit structure of the scanning drive signal on the reflective display device in Embodiment 2 of the present invention.

[0058] Figure 18 is a schematic diagram of the reflective display device in the white state in Embodiment 3 of the present invention.

[0059] Figure 19 is a schematic diagram of the reflective display device in the black state in Embodiment 3 of the present invention. Embodiments of the present invention

[0060] 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 device and driving method proposed according to the present invention:

[0061] [Example 1]

[0062] Figure 1 is a planar structural schematic diagram of the reflective display device in Embodiment 1 of the present invention. Figure 2 is a circuit structural schematic diagram of the data driving signal on the reflective display device in Embodiment 1 of the present invention. Figure 3 is a circuit structural schematic diagram of the scanning driving signal on the reflective display device in Embodiment 1 of the present invention.

[0063] As shown in Figures 1 to 3, a reflective display device provided in Embodiment 1 of the present invention includes: a plurality of reflective display panels stacked on top of each other, each reflective display panel having a data line. The data line includes multiple data lines on each reflective display panel (first data line 102, second data line 202, and third data line 302 in Figures 6-8), through which data driving signals are applied to the reflective display panels.

[0064] The system includes a data driver chip 41 and a data signal distributor 42. The data driver chip 41 is electrically connected to the data signal distributor 42 and is used to input data driving signals (e.g., grayscale signals) to the data signal distributor 42. There is only one data driver chip 41 and one data signal distributor 42. The data lines on multiple reflective display panels are all electrically connected to the same data signal distributor 42. The data signal distributor 42 is used to distribute the data driving signals to the corresponding data lines on the reflective display panels. By sharing a single data signal distributor 42 among multiple reflective display panels, the data signal distributor 42 can distribute the data driving signals input from the data driver chip 41 to the corresponding data lines on the reflective display panels. This allows multiple reflective display panels to share the data driver chip 41, reducing the number of data driver chips and lowering manufacturing costs.

[0065] Furthermore, among the multiple reflective display panels, the one furthest from the external environment is a cholesteric liquid crystal reflective display panel or an electrophoretic reflective display panel, while the remaining reflective display panels are all cholesteric liquid crystal reflective display panels. In this embodiment, all reflective display panels are cholesteric liquid crystal reflective display panels.

[0066] Figure 5 is a schematic diagram of the reflective display device in its initial state according to Embodiment 1 of the present invention. As shown in Figure 5, there are three reflective display panels. The three reflective display panels are arranged in sequence towards the external environment as a first reflective display panel 10, a second reflective display panel 20, and a third reflective display panel 30. That is, the third reflective display panel 30 is closest to the external environment, the first reflective display panel 10 is furthest from the external environment, and the second reflective display panel 20 is located between the first reflective display panel 10 and the third reflective display panel 30. Ambient light from the external environment enters the third reflective display panel 30, the second reflective display panel 20, and the first reflective display panel 10 in sequence. In this embodiment, the first reflective display panel 10, the second reflective display panel 20, and the third reflective display panel 30 reflect a first color light, a second color light, and a third color light, respectively, in their reflective state. The first, second, and third color lights are all different colors of light, specifically red, blue, and green, respectively. Based on the principle of mixing the three primary colors of light, a full-color image is achieved. Alternatively, in other embodiments, there can be two reflective display panels, but the color gamut of the image will be lower, making full-color display impossible. Or, one of the reflective display panels can reflect two colors of light in its reflective state, thus achieving full-color display. However, manufacturing a reflective display panel that reflects two colors of light is more difficult and costly.

[0067] In this embodiment, the first reflective display panel 10, the second reflective display panel 20, and the third reflective display panel 30 are all cholesteric liquid crystal reflective display panels. Optionally, a light-absorbing layer can be provided on the side of the reflective display device away from the external environment. For example, a light-absorbing layer can be provided on the side of the first reflective display panel 10 away from the external environment, thereby absorbing the light passing through the first reflective display panel 10, the second reflective display panel 20, and the third reflective display panel 30, making the reflective display device darker in a black state, thus improving contrast.

[0068] The first reflective display panel 10 includes a first opposing substrate 11, a first array substrate 12 disposed opposite to the first opposing substrate 11, and a first cholesteric liquid crystal layer 13 located between the first opposing substrate 11 and the first array substrate 12. In a reflective state, the first cholesteric liquid crystal layer 13 reflects a first color of light. The second reflective display panel 20 includes a second opposing substrate 21, a second array substrate 22 disposed opposite to the second opposing substrate 21, and a second cholesteric liquid crystal layer 23 located between the second opposing substrate 21 and the second array substrate 22. In a reflective state, the second cholesteric liquid crystal layer 23 reflects a second color of light. The third reflective display panel 30 includes a third opposing substrate 31, a third array substrate 32 disposed opposite to the third opposing substrate 31, and a third cholesteric liquid crystal layer 33 located between the third opposing substrate 31 and the third array substrate 32. In a reflective state, the third cholesteric liquid crystal layer 33 reflects a third color of light. Among them, in the direction facing the external environment, there are, in order, a first array substrate 12, a first cholesteric liquid crystal layer 13, a first opposing substrate 11, a second array substrate 22, a second cholesteric liquid crystal layer 23, a second opposing substrate 21, a third array substrate 32, a third cholesteric liquid crystal layer 33, and a third opposing substrate 31.

[0069] A first pixel electrode 121 is provided on the first array substrate 12, and a first common electrode 111 cooperating with the first pixel electrode 121 is provided on the first opposing substrate 11. The first cholesteric liquid crystal layer 13 is controlled to switch between a reflective state and a transparent state through the first pixel electrode 121 and the first common electrode 111. A second pixel electrode 221 is provided on the second array substrate 22, and a second common electrode 211 cooperating with the second pixel electrode 221 is provided on the second opposing substrate 21. The second cholesteric liquid crystal layer 23 is controlled to switch between a reflective state and a transparent state through the second pixel electrode 221 and the second common electrode 211. A third pixel electrode 321 is provided on the third array substrate 32, and a third common electrode 311 cooperating with the third pixel electrode 321 is provided on the third opposing substrate 31. The third cholesteric liquid crystal layer 33 is controlled to switch between a reflective state and a transparent state through the third pixel electrode 321 and the third common electrode 311. The first common electrode 111, the second common electrode 211, and the third common electrode 311 are all planar electrodes covering the entire surface.

[0070] Figure 6 is a schematic diagram of the planar structure of the first array substrate in Embodiment 1 of the present invention. As shown in Figure 6, the first array substrate 12 is provided with multiple first scan lines 101 and multiple first data lines 102. The multiple first scan lines 101 and multiple first data lines 102 are mutually insulated and intersecting to form multiple first pixel units P1. The first array substrate 12 provides a first thin-film transistor 103 and a first pixel electrode 121 in 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 are 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. The first drain is electrically connected to the first pixel electrode 121 through a contact hole.

[0071] Figure 7 is a schematic diagram of the planar structure of the second array substrate in Embodiment 1 of the present invention. As shown in Figure 7, the second array substrate 22 is provided with multiple second scan lines 201 and multiple second data lines 202. The multiple second scan lines 201 and multiple second data lines 202 are mutually insulated and intersecting to form multiple second pixel units P2. The second array substrate 22 provides a second thin film transistor 203 and a second pixel electrode 221 in 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 are 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. The second drain is electrically connected to the second pixel electrode 221 through a contact hole.

[0072] Figure 8 is a schematic diagram of the planar structure of the third array substrate in Embodiment 1 of the present invention. As shown in Figure 8, the third array substrate 32 is provided with multiple third scan lines 301 and multiple third data lines 302. The multiple third scan lines 301 and multiple third data lines 302 are mutually insulated and intersecting to form multiple third pixel units P3. The third array substrate 32 provides a third thin film transistor 303 and a third pixel electrode 321 in each third pixel unit P3. The third pixel electrode 321 is electrically connected to the third scan line 301 and the third data line 302 adjacent to the third thin film transistor 303 through the third thin film transistor 303. The third thin film transistor 303 includes a third gate, a third active layer, a third drain, and a third source. The third gate and the third scan line 301 are located on the same layer and are electrically connected. The third gate and the third active layer are isolated by an insulating layer. The third source is electrically connected to the third data line 302. The third drain is electrically connected to the third pixel electrode 321 through a contact hole.

[0073] In this design, the projections of the first pixel unit P1, the second pixel unit P2, and the third pixel unit P3 onto the third array substrate 32 are aligned with each other. This allows a sub-pixel (pixel unit) to reflect three different colors of light, meaning that one sub-pixel corresponds to one pixel, thereby increasing the resolution of the reflective display panel.

[0074] The first opposing substrate 11, the first array substrate 12, the second opposing substrate 21, the second array substrate 22, the third opposing substrate 31, and the third array substrate 32 can be made of materials such as glass, acrylic, and polycarbonate. The materials of the first common electrode 111, the first pixel electrode 121, the second common electrode 211, the second pixel electrode 221, the third common electrode 311, and the third pixel electrode 321 can be indium tin oxide (ITO) or indium zinc oxide (IZO), etc.

[0075] In this embodiment, the first color light is red light, the second color light is green light, and the third color light is blue light. That is, the first cholesteric liquid crystal layer 13 reflects red light in the reflective state, the second cholesteric liquid crystal layer 23 reflects green light in the reflective state, and the third cholesteric liquid crystal layer 33 reflects blue light in the reflective state. Of course, in other embodiments, the first color light may be red light, the second color light may be blue light, and the third color light may be green light; or, the first color light may be blue light, the second color light may be red light, and the third color light may be green light; or, the first color light may be blue light, the second color light may be green light, and the third color light may be red light; or, the first color light may be green light, the second color light may be blue light, and the third color light may be blue light.

[0076] The cholesteric liquid crystal in the cholesteric liquid crystal layers (first cholesteric liquid crystal layer 13, second cholesteric liquid crystal layer 23, and third cholesteric liquid crystal layer 33) has three stable textures: P-state (Planar, reflective state), FC-state (Focal Conic, hazy state), and H-state (transparent state). Both the FC-state and H-state are light-transmitting states. In the P-state, the reflection spectrum of the cholesteric liquid crystal is in the visible spectrum, reflecting bright colored light. The specific color reflected 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 the cholesteric liquid crystal. In the H-state, the cholesteric liquid crystal no longer reflects the aforementioned colored light, and light can pass directly through the cholesteric liquid crystal without any scattering effect. Under the influence of a certain electric field, these three states can be transformed into each other. Among them, the P state (Planar, reflective state) and the FC state (Focal Conic, hazy state) are stable textures and do not require voltage to maintain, while the H state (transparent state) requires voltage to maintain.

[0077] Figure 9 is a schematic diagram illustrating the principle of the three state transitions of the cholesteric liquid crystal in Embodiment 1 of the present invention. Figure 10 is a schematic diagram illustrating the driving signals for the three state transitions of the cholesteric liquid crystal in Embodiment 1 of the present invention. As shown in Figures 9 and 10, a common voltage signal Vcom is applied to the common electrodes (first common electrode 111, second common electrode 211, and third common electrode 311), and a first electrical signal V1 is continuously applied to the pixel electrodes (first pixel electrode 121, second pixel electrode 221, and third pixel electrode 321). 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 common electrodes and the pixel electrodes. The cholesteric liquid crystal in the cholesteric liquid crystal layer 13 rotates and stagnates in the H state (transparent state). The common voltage signal Vcom is applied to the common electrodes, and a second electrical signal V2 is applied to the pixel electrodes. 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 common electrode and the pixel electrode. This 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, a scattering state with a light-scattering effect. A common voltage signal Vcom is applied to the common electrode, and a third electrical signal V3 is applied to the pixel electrode. 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, then rapidly decreases and becomes the same as the common voltage signal Vcom. Therefore, a strong vertical electric field is initially formed between the common electrode and the pixel electrode. This 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, 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 reflection 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.

[0078] As shown in Figure 1, the reflective display device includes a data signal circuit board 43. One end of the data signal circuit board 43 is electrically connected to a data signal distributor 42, and the other end is electrically connected to the data lines on the reflective display panel. The data signal circuit board 43 can be a flexible printed circuit board (FPC). The data signal distributor 42 transmits data drive signals to the data lines on the reflective display panel through the data signal circuit board 43. For example, each reflective display panel has a bonding area at its edge. The data lines extend from the display area to the bonding area, and the data signal circuit board 43 is bonded to the bonding area at the edge of the reflective display panel, thereby achieving an electrical connection with the data lines.

[0079] Furthermore, the data signal circuit board 43 is provided with multiple data signal branch circuit boards, and the data signal branch circuit boards are electrically connected to the reflective display panel one by one. Therefore, the number of data signal circuit boards 43 is the same as that of data signal distributors 42, and they only need to be bound once, which can reduce the number of data signal circuit boards 43 and the number of binding times, and reduce the manufacturing cost. As shown in Figures 1 and 6-8, there are three data signal branch circuit boards: a first data signal branch circuit board 431, a second data signal branch circuit board 432, and a third data signal branch circuit board 433. The end of the first data signal branch circuit board 431 furthest from the data signal distributor 42 is further bonded (electrically connected) to the data line (first data line 102) on the first reflective display panel 10. The end of the second data signal branch circuit board 432 furthest from the data signal distributor 42 is further bonded to the data line (second data line 202) on the second reflective display panel 20. The end of the third data signal branch circuit board 433 furthest from the data signal distributor 42 is further bonded to the data line (third data line 302) on the third reflective display panel 30. Of course, in other embodiments, there may be multiple data signal circuit boards 43. Each data signal circuit board 43 is electrically connected to a reflective display panel in a one-to-one correspondence. That is, each reflective display panel is provided with a separate data signal circuit board 43 to transmit signals with the data signal distributor 42. However, the number of times the data signal circuit board 43 is bound to the data signal distributor 42 will increase.

[0080] In this embodiment, each reflective display panel has a scanning line, which includes multiple scanning lines on each reflective display panel (first scanning line 101, second scanning line 201, and third scanning line 301 in Figures 6-8). The scanning line applies a scanning drive signal to the reflective display panel, causing the thin-film transistors (first thin-film transistor 103, second thin-film transistor 203, and third thin-film transistor 303 in Figures 6-8) on the corresponding reflective display panel to turn on, ensuring that the scanning line can apply a scanning drive signal to the pixel electrodes (first pixel electrode 121, second pixel electrode 221, and third pixel electrode 321) on the corresponding reflective display panel.

[0081] As shown in Figures 1 and 3, the reflective display device further includes a scan driver chip 51 and a scan signal distributor 52. The scan driver chip 51 is electrically connected to the scan signal distributor 52 and is used to input scan drive signals to the scan signal distributor 52. The scan lines on multiple reflective display panels are all electrically connected to the same scan signal distributor 52. The scan signal distributor 52 is used to distribute the scan drive signals to the scan lines on the corresponding reflective display panels. By sharing a single scan signal distributor 52 among multiple reflective display panels, the scan signal distributor 52 can distribute the scan drive signals input by the scan driver chip 51 to the scan lines on the corresponding reflective display panels, thereby allowing multiple reflective display panels to share the scan driver chip 51, reducing the number of scan driver chips and lowering manufacturing costs.

[0082] Furthermore, the reflective display device includes a scan signal circuit board 53, one end of which is electrically connected to a scan signal distributor 52, and the other end is electrically connected to the scan lines on the reflective display panel. The scan signal circuit board 53 can be a flexible printed circuit board (FPC), and the scan signal distributor 52 transmits scan drive signals to the scan lines on the reflective display panel through the scan signal circuit board 53. For example, each reflective display panel has a bonding area at its edge, and the scan lines extend from the display area to the bonding area. The scan signal circuit board 53 is bonded to the bonding area at the edge of the reflective display panel, thereby achieving an electrical connection with the scan lines.

[0083] The scanning signal circuit board 53 is provided with multiple scanning signal branch circuit boards, and the scanning signal branch circuit boards are connected one-to-one with the reflective display panel. Therefore, the number of scanning signal circuit boards 53 and scanning signal distributors 52 is the same, and they only need to be bound once, which can reduce the number of scanning signal circuit boards 53 and the number of binding times, and reduce the manufacturing cost. In this embodiment, as shown in Figures 1 and 6-8, there are three scanning signal branch circuit boards: a first scanning signal branch circuit board 531, a second scanning signal branch circuit board 532, and a third scanning signal branch circuit board 533. The end of the first scanning signal branch circuit board 531 away from the scanning signal distributor 52 is further bound (electrically connected) to the scanning line (first scan line 101) on the first reflective display panel 10. The end of the second scanning signal branch circuit board 532 away from the scanning signal distributor 52 is further bound to the scanning line (second scan line 201) on the second reflective display panel 20. The end of the third scanning signal branch circuit board 533 away from the scanning signal distributor 52 is further bound to the scanning line (third scan line 301) on the third reflective display panel 30. Of course, in other embodiments, there may be multiple scanning signal circuit boards 53. Each scanning signal circuit board 53 is electrically connected to a reflective display panel in a one-to-one correspondence. That is, each reflective display panel is provided with a separate scanning signal circuit board 53 to transmit signals with the scanning signal distributor 52. However, the number of times the scanning signal circuit board 53 is bound to the scanning signal distributor 52 will increase.

[0084] Figure 4 is a schematic diagram of the signal distributor in Embodiment 1 of the present invention. As shown in Figure 4, the signal distributor can distribute the driving signal input by the driving chip to the corresponding reflective display panel according to the control signal (distribution instruction) applied by the driving chip or the central processing unit. The signal distributor is a logic circuit that sends the signal from one signal source to multiple different channels as needed. Its function is equivalent to a single-pole multi-throw switch with multiple outputs. A circuit that can transmit one input signal to any of the m output terminals as needed is called a signal distributor, also known as a multiplexer. Its logic function is exactly the opposite of that of a signal selector. For example, the data signal distributor 42 can distribute the data driving signal input by the data driving chip 41 to the data line on the corresponding reflective display panel according to the control signal applied by the driving chip (data driving chip 41) or the central processing unit. The data driving signals input by the data driving chip 41 are Va / Vb / Vc, where Va, Vb, and Vc correspond to the data driving signals of the first reflective display panel 10, the second reflective display panel 20, and the third reflective display panel 30, respectively. The data signal distributor 42 can distribute the first data driving signal Va input by the data driving chip 41 to the data lines (first data line 102) on the first reflective display panel 10, distribute the second data driving signal Vb input by the data driving chip 41 to the data lines (second data line 202) on the second reflective display panel 20, and distribute the third data driving signal Vc input by the data driving chip 41 to the data lines (third data line 302) on the third reflective display panel 30, according to the control signal applied by the driving chip (data driving chip 41) or the central processing unit. Since the scan drive signal applied by the scan drive chip 51 is used to control the switching state of the thin-film transistors (the first thin-film transistor 103, the second thin-film transistor 203, and the third thin-film transistor 303 in Figures 6-8) on the reflective display panel, the scan drive signal for each reflective display panel is the same. The scan drive chip 51 only needs to input one scan drive signal to the scan signal distributor 52. Then, the scan signal distributor 52 distributes the scan drive signal input by the scan drive chip 51 to the scan line on the corresponding reflective display panel according to the control signal applied by the drive chip (scan drive chip 51) or the central processing unit.

[0085] The following description assumes that the cholesteric liquid crystal layers (first cholesteric liquid crystal layer 13, second cholesteric liquid crystal layer 23, and third cholesteric liquid crystal layer 33) are all in a reflective state in their initial state, and the transparent state is FC (Focal Conic, hazy state). The FC transparent state saves power in static reflective displays. Of course, in other embodiments, the cholesteric liquid crystal layers (first cholesteric liquid crystal layer 13, second cholesteric liquid crystal layer 23, and third cholesteric liquid crystal layer 33) can also all be in a transparent state in their initial state (e.g., FC state, hazy state). Alternatively, the transparent state can also be H state (transparent state), but this results in higher power consumption.

[0086] Figure 11 is a schematic diagram of the reflective display device in Embodiment 1 of the present invention when displaying a red image. As shown in Figure 11, when displaying a red image, a 0V common voltage is applied to the first common electrode 111, the second common electrode 211, and the third common electrode 311, and a grayscale voltage is applied to the second pixel electrode 221 and the third pixel electrode 321. Then, the voltage is gradually reduced to 0, controlling the second cholesteric liquid crystal layer 23 and the third cholesteric liquid crystal layer 33 to be in a transparent state. No voltage is applied to the first pixel electrode 121, controlling the first cholesteric liquid crystal layer 13 to be in a reflective state and reflecting the first color light, i.e., reflecting red light. That is, the data signal distributor 42 distributes the transparent state data driving signal to the second reflective display panel 20 and the third reflective display panel 30, and distributes the reflective state data driving signal to the first reflective display panel 10, according to the control signal applied by the driver chip or the central processing unit.

[0087] Figure 12 is a schematic diagram of the reflective display device in Embodiment 1 of the present invention when displaying a green image. As shown in Figure 12, when displaying a green image, a 0V common voltage is applied to the first common electrode 111, the second common electrode 211, and the third common electrode 311, and a grayscale voltage is applied to the first pixel electrode 121 and the third pixel electrode 321. Then, the voltage is gradually reduced to 0, controlling the first cholesteric liquid crystal layer 13 and the third cholesteric liquid crystal layer 33 to be in a transparent state. No voltage is applied to the second pixel electrode 221, controlling the second cholesteric liquid crystal layer 23 to be in a reflective state and reflecting the second color light, i.e., reflecting green light. That is, the data signal distributor 42 distributes the transparent state data driving signal to the first reflective display panel 10 and the third reflective display panel 30, and distributes the reflective state data driving signal to the second reflective display panel 20, according to the control signal applied by the driver chip or the central processing unit.

[0088] Figure 13 is a schematic diagram of the reflective display device in Embodiment 1 of the present invention when displaying a blue image. As shown in Figure 13, when displaying a blue image, a 0V common voltage is applied to the first common electrode 111, the second common electrode 211, and the third common electrode 311, and a grayscale voltage is applied to the first pixel electrode 121 and the second pixel electrode 221. Then, the voltage is gradually reduced to 0, controlling the first cholesteric liquid crystal layer 13 and the second cholesteric liquid crystal layer 23 to be in a transparent state. No voltage is applied to the third pixel electrode 321, controlling the third cholesteric liquid crystal layer 33 to be in a reflective state and reflecting the third color light, i.e., reflecting blue light. That is, the data signal distributor 42 distributes the transparent state data driving signal to the first reflective display panel 10 and the second reflective display panel 20, and distributes the reflective state data driving signal to the third reflective display panel 30, according to the control signal applied by the driver chip or the central processing unit.

[0089] Figure 14 is a schematic diagram of the reflective display device in the white state according to Embodiment 1 of the present invention. As shown in Figure 14, when displaying a white screen, a 0V common voltage is applied to the first common electrode 111, the second common electrode 211, and the third common electrode 311, while no voltage is applied to the first pixel electrode 121, the second pixel electrode 221, and the third pixel electrode 321. The first cholesteric liquid crystal layer 13 is controlled to be in a reflective state and reflect the first color light, i.e., reflect red light; the second cholesteric liquid crystal layer 23 is controlled to be in a reflective state and reflect the second color light, i.e., reflect green light; and the third cholesteric liquid crystal layer 33 is controlled to be in a reflective state and reflect the third color light, i.e., reflect blue light, thereby making the reflective display device display a white screen. That is, the data signal distributor 42 distributes the data driving signal of the reflective state to the first reflective display panel 10, the second reflective display panel 20, and the third reflective display panel 30 according to the control signal applied by the driver chip or the central processing unit.

[0090] Figure 15 is a schematic diagram of the reflective display device in the black state according to Embodiment 1 of the present invention. As shown in Figure 15, when displaying a black screen, a 0V common voltage is applied to the first common electrode 111, the second common electrode 211, and the third common electrode 311, and a grayscale voltage is applied to the first pixel electrode 121, the second pixel electrode 221, and the third pixel electrode 321. Then, the voltage is gradually reduced to 0, controlling the first cholesteric liquid crystal layer 13, the second cholesteric liquid crystal layer 23, and the third cholesteric liquid crystal layer 33 to be in a light-transmitting state. Ambient light passes through the third reflective display panel 30, the second reflective display panel 20, and the first reflective display panel 10 in sequence, thereby making the reflective display device display a black screen. That is, the data signal distributor 42 distributes the light-transmitting data driving signal to the first reflective display panel 10, the second reflective display panel 20, and the third reflective display panel 30 according to the control signal applied by the driver chip or the central processing unit.

[0091] In one embodiment, when a color image is required, it is only necessary to control the grayscale voltage (0-255 grayscale) applied to the first pixel electrode 121, the second pixel electrode 221, and the third pixel electrode 321 to control the reflectivity of the first cholesteric liquid crystal layer 13, the second cholesteric liquid crystal layer 23, and the third cholesteric liquid crystal layer 33, thereby achieving full-color image display based on the principle of mixing the three primary colors of light. In another embodiment, the reflective display device also includes a color correction circuit, which is electrically connected to the data signal distributor 42 and is used to adjust the color output of each reflective display panel. Since multiple reflective display panels use the same data driver chip 41 and data signal distributor 42, the actual data driver signal transmitted to the reflective display panels will inevitably deviate, resulting in image distortion. The color correction circuit can correct the data driver signal to improve the display quality.

[0092] Optionally, correction elements or circuits can be integrated into the driver chip or the hardware design of the reflective display device as color correction circuits to optimize color effects. In one embodiment, a color compensation circuit can be used to add a compensation voltage to the drive signal to adjust the color output. In another embodiment, the signal transmission rate can be optimized in the driver circuit of the reflective display device to ensure consistent response time during color transitions, thereby achieving a smooth and continuous color transition effect. The correction technique using the color correction circuit can achieve color balance in the early stages of drive signal generation, reducing the need for subsequent color processing.

[0093] This application also provides a driving method for a reflective display device, used to drive the reflective display device as described above. The driving method includes:

[0094] The data driver chip 41 inputs a data drive signal to the data signal distributor 42;

[0095] The control data signal distributor 42 distributes corresponding data driving signals to the data lines on each reflective display panel. In this embodiment, there are three reflective display panels, which are arranged sequentially in the direction facing the external environment as a first reflective display panel 10, a second reflective display panel 20, and a third reflective display panel 30. The data driving signals include a first data driving signal Va corresponding to the first reflective display panel 10, a second data driving signal Vb corresponding to the second reflective display panel 20, and a third data driving signal Vc corresponding to the third reflective display panel 30. The data signal distributor 42 can distribute the first data driving signal Va input by the data driving chip 41 to the data lines (first data line 102) on the first reflective display panel 10, distribute the second data driving signal Vb input by the data driving chip 41 to the data lines (second data line 202) on the second reflective display panel 20, and distribute the third data driving signal Vc input by the data driving chip 41 to the data lines (third data line 302) on the third reflective display panel 30, according to the control signals applied by the data driving chip (data driving chip 41) or the central processing unit.

[0096] Furthermore, the control data signal distributor 42 sequentially distributes the corresponding data driving signals to the data lines on each reflective display panel, that is, the control data signal distributor 42 can distribute the corresponding data driving signals to the data lines on each reflective display panel in time periods. For example, in the first time period, the data driving chip 41 inputs a first data driving signal Va to the data signal distributor 42, and the data signal distributor 42 distributes the first data driving signal Va input by the data driving chip 41 to the data lines (first data line 102) on the first reflective display panel 10; in the second time period, the data driving chip 41 inputs a second data driving signal Vb to the data signal distributor 42, and distributes the second data driving signal Vb input by the data driving chip 41 to the data lines (second data line 202) on the second reflective display panel 20; in the third time period, the data driving chip 41 inputs a third data driving signal Vc to the data signal distributor 42, and distributes the third data driving signal Vc input by the data driving chip 41 to the data lines (third data line 302) on the third reflective display panel 30. By superimposing the images displayed on the first reflective display panel 10, the second reflective display panel 20, and the third reflective display panel 30 in three time periods, a full-color image can be displayed, which places lower demands on the data processing capabilities of the data driver chip 41 and the data signal distributor 42.

[0097] In another embodiment, the control data signal distributor 42 simultaneously distributes corresponding data driving signals to the data lines on each reflective display panel. For example, the data driving chip 41 simultaneously inputs a first data driving signal Va, a second data driving signal Vb, and a third data driving signal Vc to the data signal distributor 42. The data signal distributor 42, based on control signals applied by the driving chip (data driving chip 41) or the central processing unit, simultaneously distributes the first data driving signal Va input by the data driving chip 41 to the data lines (first data line 102) on the first reflective display panel 10, distributes the second data driving signal Vb input by the data driving chip 41 to the data lines (second data line 202) on the second reflective display panel 20, and distributes the third data driving signal Vc input by the data driving chip 41 to the data lines (third data line 302) on the third reflective display panel 30. By superimposing the displayed images on the first reflective display panel 10, the second reflective display panel 20, and the third reflective display panel 30 at the same time, a full-color image is displayed. However, this places high demands on the data processing capabilities of the data driving chip 41 and the data signal distributor 42.

[0098] In this embodiment, each reflective display panel has a scanning line. The reflective display device includes a scanning driver chip 51 and a scanning signal distributor 52. The scanning driver chip 51 is electrically connected to the scanning signal distributor 52 and is used to input a scanning driving signal to the scanning signal distributor 52. The scanning lines on multiple reflective display panels are all electrically connected to the same scanning signal distributor 52. The scanning signal distributor 52 is used to distribute the scanning driving signal to the scanning lines on the corresponding reflective display panels. The driving method further includes:

[0099] When the control data signal distributor 42 distributes the corresponding data drive signal to the data lines on each reflective display panel, it simultaneously controls the scan signal distributor 52 to distribute the corresponding scan drive signal to the scan lines on the reflective display panel that distributes the data drive signal. For example, when it is necessary to control the first reflective display panel 10 to refresh the screen, the scan signal distributor 52 distributes the scan drive signal input by the scan drive chip 51 to the scan lines (first scan lines 101) on the first reflective display panel 10 according to the control signal applied by the driver chip (scan driver chip 51) or the central processing unit. At the same time, the data signal distributor 42 distributes the first data drive signal Va input by the data driver chip 41 to the data lines (first data lines 102) on the first reflective display panel 10. When it is necessary to control the second reflective display panel 20 to refresh the screen, the scan signal distributor 52 distributes the scan drive signal input by the scan driver chip 51 to the second reflective display panel 20 according to the control signal applied by the driver chip (scan driver chip 51) or the central processing unit. The scanning line (second scan line 201) on the second reflective display panel 20 is distributed by the data signal distributor 42, which distributes the second data driving signal Vb input by the data driving chip 41 to the data line (second data line 202) on the second reflective display panel 20. When it is necessary to control the third reflective display panel 30 to refresh the screen, the scanning signal distributor 52 distributes the scanning driving signal input by the scanning driving chip 51 to the scanning line (third scan line 301) on the third reflective display panel 30 according to the control signal applied by the driving chip (scan driving chip 51) or the central processing unit. At the same time, the data signal distributor 42 distributes the third data driving signal Vc input by the data driving chip 41 to the data line (third data line 302) on the third reflective display panel 30.

[0100] Specifically, the control scan signal distributor 52 can sequentially distribute the corresponding scan drive signals to the scan lines on each reflective display panel, that is, the control scan signal distributor 52 can distribute the corresponding scan drive signals to the scan lines on each reflective display panel in time intervals. Alternatively, the control scan signal distributor 52 can also distribute the corresponding scan drive signals to the scan lines on each reflective display panel simultaneously.

[0101] Since multiple reflective display panels all use the same data driver chip 41 and data signal distributor 42, deviations in the actual data driver signals transmitted to the reflective display panels are inevitable, leading to image distortion. A color correction circuit can be used to correct the data driver signals to improve the display quality. Therefore, in another embodiment, the reflective display device further includes a color correction circuit electrically connected to the data signal distributor 42 and used to adjust the color output of each reflective display panel. The driving method further includes:

[0102] Step A: Based on the color response range of each reflective display panel, the data driving signal is mapped to the color space of the reflective display device for compression or expansion processing. Based on the transition relationship between different colors, the parameters of the mapping algorithm are adjusted, and the data driving signal corresponding to each reflective display panel is adjusted for the first difference through color interpolation or curve fitting.

[0103] For example, color mapping algorithms can optimize the mapping relationship of color transitions, ensuring smooth transitions between different colors. Color mapping algorithms map input data driving signals into the color space of a reflective display device, taking into account the characteristics of each reflective display panel. For instance, if a reflective display panel has a narrow color response range, the mapping algorithm can compress or expand the input data driving signal to ensure that all reflective display panels are fully utilized. By optimizing the mapping algorithm, overall color balance and accuracy can be achieved. For color transition problems, these algorithms can achieve continuous and natural color transition effects by optimizing the color transition path in the color space. By adjusting the parameters of the mapping algorithm, such as the color interpolation method or curve fitting method, smoother and more accurate color transition effects can be achieved.

[0104] For example, before the data-driven signal is mapped to the color space of a reflective display device, the reflective display device can be color-calibrated to ensure that the color response range and color output of each reflective display panel meet the expected standards. This may involve adjusting the color response curve of the reflective display panel or calibrating the panel to make the output colors more accurate and consistent. Then, based on the color response range of each reflective display panel, a mapping algorithm is used to map the input data-driven signal to the color space of the reflective display device. Gamma correction algorithms, Look-Up Table (LUT) algorithms, linear interpolation, polynomial fitting, etc., can be used to complete the mapping process.

[0105] For example, gamma correction is a common mapping algorithm used to adjust the brightness level of an input data drive signal to match the response curve of a display device. By making a non-linear adjustment to the input data drive signal, gamma correction can improve the brightness uniformity and color accuracy of the display. The steps of mapping using a gamma correction algorithm include:

[0106] S11: Determine the Gamma value to be used. The Gamma value represents the non-linear relationship between the brightness of the input data driving signal and the output brightness. Common Gamma values ​​are typically between 1.8 and 2.5, depending on the characteristics of the display device and the desired display effect.

[0107] S12: Performs a nonlinear transformation on the input data driving signal to adjust its brightness level. Gamma correction uses a power function, expressed as: [V_{out}}=V_{in}}^\gamma]

[0108] Where (V_{\text{in}}) is the brightness value (grayscale brightness) of the input data driving signal, (V_{\text{out}}) is the brightness value of the output data driving signal after Gamma correction, and (\gamma) is the selected Gamma value.

[0109] S13: Perform Gamma correction on the input data drive signal for each grayscale level to obtain the corresponding output data drive signal. This allows adjustment of the brightness of each grayscale level to make it more accurate and consistent in display on the output device.

[0110] S14: Perform brightness equalization processing to ensure a uniform and smooth overall display effect. Brightness equalization is typically considered during Gamma correction. Because Gamma correction is non-linear, brightness equalization processing can prevent distortion at certain brightness levels.

[0111] For example, the Look-Up Table (LUT) algorithm maps input data driving signals to the output color space using a pre-built lookup table. This method can precisely correct the output of each reflective display panel to achieve the desired color performance. The steps of mapping using the Look-Up Table algorithm include:

[0112] S21: Create a Look-Up Table based on the color response range of each reflective display panel and the color space of the reflective display device. This table contains the mapping relationship between input data drive signals and corresponding output data drive signals.

[0113] S22: Discretize the input data. Discretize the range of values ​​of the input data driving signal, typically by dividing it into several discrete values ​​or levels. These discretized values ​​will be used as input to the LUT table.

[0114] S23: For each discretized input data driving signal value, calculate the corresponding output data driving signal value using a mapping algorithm, and fill this pair of input and output data driving signal values ​​into the LUT table. This filling process can be completed using methods such as gamma correction and polynomial fitting.

[0115] S24: When a new input data drive signal is received, the system will look up the corresponding output data drive signal value in the LUT table based on the input data drive signal. This lookup process is very fast because the LUT table can pre-calculate all possible mapping relationships.

[0116] S25: Finally, the output data driving signal value found in the LUT table is sent as a processed signal to the corresponding reflective display panel to ensure accurate color display and full utilization.

[0117] For example, linear interpolation is a simple yet effective mapping algorithm that maps the input data driving signal to the output color space by performing a linear transformation on the signal's value. While not as precise as Gamma correction and LUT mapping, linear interpolation can improve color accuracy and smoothness to some extent. The steps for mapping using a linear interpolation algorithm include:

[0118] S31: Determine the value range of the input data drive signal. This is to ensure that the input data drive signal is processed appropriately to suit the color response range of the reflective display panel and the color space of the reflective display device. The value range of the input data drive signal is usually determined based on the specific color response range of the reflective display panel and the color space of the reflective display device.

[0119] S32: Determine the value range of the output data drive signal to ensure it is compatible with the color space of the reflective display device and the color response range of the reflective display panel. This is to ensure that the output data drive signal is within the correct range so as to correctly drive the reflective display panel to display the correct colors and brightness.

[0120] S33: Establish a linear mapping relationship based on the value ranges of the input and output data driving signals to facilitate interpolation calculations. This typically involves determining the values ​​of the two endpoints: the minimum and maximum values ​​of the input data driving signal, respectively, corresponding to the values ​​of the output data driving signal.

[0121] S34: When a new input data drive signal is received, a linear interpolation algorithm is used to calculate the corresponding output data drive signal value. This calculation process is based on known data points and uses a linear relationship to estimate or predict values ​​between these data points. The linear interpolation algorithm is typically based on known data points, such as endpoint values, and uses a linear relationship to calculate values ​​between these data points to obtain the value of the output data drive signal.

[0122] S35: Based on the output data drive signal value calculated by linear interpolation, it is sent as a processed signal to the corresponding reflective display panel to ensure accurate color display and full utilization. This step ensures that the interpolated output data drive signal is correctly applied to the reflective display panel to display the correct colors and brightness, thereby achieving signal compression or expansion processing.

[0123] For example, polynomial fitting is a mapping algorithm based on a mathematical model. It approximates the relationship between discrete data points by fitting a mathematical function between the input data-driven signal and the output color space using a polynomial. This allows it to find the optimal fitting curve to minimize the difference between predicted values ​​and actual data points, thus achieving accurate color correction and mapping. This method typically requires more complex calculations but can provide more accurate color matching. The mapping process using a polynomial fitting algorithm includes:

[0124] S41: Acquire input / output characteristic data of the display device (reflective display device). This data typically includes the actual display brightness or color values ​​under different input data drive signal strengths.

[0125] S42: Choose an appropriate polynomial order. The polynomial order determines the complexity of the fitted curve. Generally, the higher the order, the more accurate the curve fit.

[0126] S43: Based on the selected order, construct a polynomial model. For example, a quadratic polynomial model can be represented as: P(x) = ax^2 + bx + c

[0127] Where a, b, and c are polynomial coefficients, and x is the input data driving signal.

[0128] S44: Use the collected data points to calculate the coefficients of the polynomial. This is usually achieved using the least squares method, i.e., finding the coefficients that minimize the sum of squared errors between the fitted curve and the actual data points.

[0129] S45: Based on the calculated coefficients, establish a polynomial fitting curve. This curve describes the relationship between the input data driving signal and the output of the display device.

[0130] S46: Map the input data driving signal to the color space of the display device using a fitted curve. For example, if the intensity of the input data driving signal is x, then the value calculated by the polynomial P(x) is the intensity that the reflective display panel should display.

[0131] S35: Based on the calculated output data, the driving signal value is sent as a processed signal to the corresponding reflective display panel to ensure accurate color display and full utilization. The effectiveness of the polynomial fitting mapping can also be verified by comparing the mapped output with the expected output.

[0132] Step B: Based on the color response characteristics and color space standards of each reflective display panel, invoke the calibration curve or lookup table, and perform a second difference adjustment by dynamically adjusting the data drive signal corresponding to each reflective display panel.

[0133] For example, color correction algorithms can ensure color balance for each reflective display panel by processing the generated data-driven signals in real time, based on the color response characteristics of the reflective display device and a standard color space. Color correction algorithms can be adjusted according to panel characteristics and manufacturing process variations. For instance, if the response of a reflective display panel is uneven, the algorithm can weight or correct the corresponding data-driven signals to achieve overall color balance. The core of color correction lies in adjusting colors during data-driven signal conversion based on the color response characteristics of the reflective display device and a standard color space. For color transition issues, color correction algorithms can ensure smoothness and consistency in color transitions from one color to another. They avoid disjointed or uneven color transitions by appropriately weighting or correcting the data-driven signals in transition areas. These algorithms can dynamically adjust the data-driven signals according to specific color transition conditions to ensure natural and smooth color transitions.

[0134] Step C: Obtain the ambient light level, monitor the color output brightness and color saturation of each reflective display panel, monitor the color brightness change rate and color protection change rate in the color transition area, adjust the data drive signal that exceeds the preset change rate threshold, and perform a third difference adjustment on the data drive signal corresponding to each reflective display panel based on the display mode standard parameters of the reflective display device.

[0135] For example, sensors or feedback mechanisms can be used to monitor the color output of a reflective display device and adjust the generated data-driven signal in real time based on the monitoring results. For color transition issues, intelligent adjustment technology can monitor color response in transition areas and dynamically adjust the data-driven signal to ensure smoothness and continuity of color transitions. For instance, by detecting changes in color brightness and saturation in transition areas, the system can adaptively adjust the color output to eliminate discontinuities or abrupt changes in color transitions. For example, by monitoring ambient light levels through optical sensors, the system can adjust the data-driven signal to adapt to different lighting conditions to ensure color balance. Intelligent adjustment technology can also adaptively adjust based on the panel's aging level or temperature changes.

[0136] Step D: Determine the color transition area of ​​the data driving signal, and perform weighted correction on the color gradient difference of the color transition area according to the color transition needs of different color display areas. Smooth the color transition path in the color space to perform a fourth difference adjustment on the data driving signal corresponding to each reflective display panel.

[0137] For example, a color management system (CMS) is a software or hardware system, typically embedded in a driver chip or display controller, that dynamically adjusts the output of each reflective display panel. In addressing color transition issues, a color management system can improve color transition effects by optimizing the color transition path within the color space. It can smoothly adjust the color output in transition areas as needed to ensure color continuity and consistency. Through calibration curves or lookup tables (LUTs), a CMS can achieve fine-tuning of color transitions to meet user needs and preferences. For example, a color management system can dynamically adjust the output of each reflective display panel based on user preferences or preset color standards. This can be achieved through calibration curves or lookup tables (LUTs) to ensure color balance for each reflective display panel. The color management system can also provide a user interface, allowing users to adjust colors according to their needs.

[0138] [Example 2]

[0139] Figure 16 is a planar structural schematic diagram of the reflective display device in Embodiment 2 of the present invention. Figure 17 is a circuit structural schematic diagram of the scanning drive signal on the reflective display device in Embodiment 2 of the present invention. As shown in Figures 16 and 17, the reflective display device and driving method provided in Embodiment 2 of the present invention are basically the same as those in Embodiment 1 (Figures 1 to 15), except that in this embodiment:

[0140] The reflective display device includes multiple scan driver chips 51, which are electrically connected to the reflective display panels one by one. The scan driver chip 51 is used to directly input scan drive signals to the scan lines on the corresponding reflective display panels. Each reflective display panel uses a separate scan driver chip 51 to apply scan drive signals, thus eliminating the need for a scan signal distributor 52.

[0141] Furthermore, there are three reflective display panels, which are, in order, a first reflective display panel 10, a second reflective display panel 20, and a third reflective display panel 30 facing the external environment. There are also three scan driver chips 51, which are, in order, a first scan driver chip 511, a second scan driver chip 512, and a third scan driver chip 513. The first scan driver chip 511 is disposed on the first reflective display panel 10 and electrically connected to the scan line (first scan line 101) on the first reflective display panel 10. The first scan driver chip 511 is used to directly input scan drive signals to the scan line (first scan line 101) on the first reflective display panel 10. The second scan driver chip 512 is disposed on the second reflective display panel 20 and electrically connected to the scan line (second scan line 201) on the second reflective display panel 20. The second scan driver chip 512 is used to directly input scan drive signals to the scan line (second scan line 201) on the second reflective display panel 20. The third scan driver chip 513 is disposed on the third reflective display panel 30 and electrically connected to the scan line (third scan line 301) on the third reflective display panel 30. The third scan driver chip 513 is used to directly input scan drive signals to the scan line (third scan line 301) on the third reflective display panel 30.

[0142] 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.

[0143] [Example 3]

[0144] Figure 18 is a schematic diagram of the reflective display device in the white state according to Embodiment 3 of the present invention. Figure 19 is a schematic diagram of the reflective display device in the black state according to Embodiment 3 of the present invention. As shown in Figures 18 and 19, the reflective display device and driving method provided in Embodiment 3 of the present invention are basically the same as those in Embodiment 1 (Figures 1 to 15) and Embodiment 2 (Figures 16 to 17), except that in this embodiment:

[0145] Among the multiple reflective display panels, the one furthest from the external environment is an electrophoretic reflective display panel, while the remaining reflective display panels are cholesteric liquid crystal reflective display panels. In this embodiment, there are three reflective display panels, which are arranged sequentially towards the external environment as a first reflective display panel 10, a second reflective display panel 20, and a third reflective display panel 30. The first reflective display panel 10 is an electrophoretic reflective display panel, while the second reflective display panel 20 and the third reflective display panel 30 are cholesteric liquid crystal reflective display panels. The structures of the second reflective display panel 20 and the third reflective display panel 30 can be referred to in Embodiment 1.

[0146] The first reflective display panel 10 includes a first opposing substrate 11, a first array substrate 12 disposed opposite to the first opposing substrate 11, and ink capsules 14 located between the first opposing substrate 11 and the first array substrate 12. Each ink capsule 14 contains black ink particles 141 of opposite polarities, first-color ink particles 142, and an electrophoretic solution. The first-color ink particles 142 reflect light of a first color, while the black ink particles 141 absorb light of various colors, making the reflective display device appear darker in a black state, thereby improving contrast. By providing electric fields in different directions to the ink capsules 14, the black ink particles 141 and the first-color ink particles 142 can move in corresponding directions. For example, the black ink particles 141 are negatively charged, and the first-color ink particles 142 are positively charged, causing the first-color ink particles 142 to move in the direction of the electric field, and the black ink particles 141 to move in the opposite direction of the electric field. If an upward-facing electric field is provided, the first-color ink particle 142 moves upward, and the black ink particle 141 moves downward; if a downward-facing electric field is provided, the first-color ink particle 142 moves downward, and the black ink particle 141 moves upward. Alternatively, the black ink particle 141 can be positively charged, and the first-color ink particle 142 negatively charged, causing the black ink particle 141 to move in the direction of the electric field, and the first-color ink particle 142 to move in the opposite direction of the electric field.

[0147] A first pixel electrode 121 is provided on the first array substrate 12, and a first common electrode 111 cooperating with the first pixel electrode 121 is provided on the first opposing substrate 11. By controlling the voltage polarity on the first pixel electrode 121, the direction of the electric field between the first pixel electrode 121 and the first common electrode 111 is controlled, thereby controlling the ink capsule 14 to switch between a black state (light-absorbing state) and a reflective state. For example, if a 0V common voltage is applied to the first common electrode 111, and a positive voltage is applied to the first pixel electrode 121, the direction of the electric field between the first pixel electrode 121 and the first common electrode 111 is upward; if a negative voltage is applied to the first pixel electrode 121, the direction of the electric field between the first pixel electrode 121 and the first common electrode 111 is downward.

[0148] In this embodiment, the first color light is red light, the second color light is green light, and the third color light is blue light. That is, the first color ink particles 142 are used to reflect red light, the second cholesteric liquid crystal layer 23 is used to reflect green light in the reflective state, and the third cholesteric liquid crystal layer 33 is used to reflect blue light in the reflective state.

[0149] The following explanation uses an example where black ink particles 231 are negatively charged and first-color ink particles 142 are positively charged. As shown in Figure 18, when displaying a white screen, a 0V common voltage is applied to the first common electrode 111, the second common electrode 211, and the third common electrode 311. A positive grayscale voltage is applied to the first pixel electrode 121, while no voltage is applied to the second pixel electrode 221 and the third pixel electrode 321. The first-color ink particles 142 in the ink capsule 14 are controlled to concentrate near the first common electrode 111 and reflect the first color light, i.e., reflect red light; the second cholesteric liquid crystal layer 23 is controlled to be in a reflective state and reflect the second color light, i.e., reflect green light; and the third cholesteric liquid crystal layer 33 is controlled to be in a reflective state and reflect the third color light, i.e., reflect blue light, thereby causing the reflective display device to display a white screen. That is, the data signal distributor 42 distributes the reflective data driving signal to the first reflective display panel 10, the second reflective display panel 20, and the third reflective display panel 30 according to the control signal applied by the driver chip or the central processing unit.

[0150] As shown in Figure 19, when displaying a black screen, a 0V common voltage is applied to the first common electrode 111, the second common electrode 211, and the third common electrode 311, and a negative grayscale voltage is applied to the first pixel electrode 121. Grayscale voltages are applied to the second pixel electrode 221 and the third pixel electrode 321, and then the voltage is gradually reduced to 0. This controls the black ink particles 141 in the ink capsule 14 to concentrate near the first common electrode 111 and be in a light-absorbing state; it also controls the second cholesteric liquid crystal layer 23 and the third cholesteric liquid crystal layer 33 to be in a light-transmitting state. Ambient light passes sequentially through the third reflective display panel 30 and the second reflective display panel 20 and is absorbed by the black ink particles 141 in the first reflective display panel 10, thereby causing the reflective display device to display a black screen. That is, the data signal distributor 42 distributes the light-transmitting data driving signal to the second reflective display panel 20 and the third reflective display panel 30, and distributes the light-absorbing data driving signal to the first reflective display panel 10, according to the control signal applied by the driver chip or the central processing unit.

[0151] When a color image is required, it is only necessary to control the grayscale voltage (0-255 grayscale) applied to the first pixel electrode 121, the second pixel electrode 221 and the third pixel electrode 321 to control the amount of light reflected from the ink capsule 14, the second cholesteric liquid crystal layer 23 and the third cholesteric liquid crystal layer 33, and to achieve full-color image display based on the principle of mixing the three primary colors of light.

[0152] 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.

[0153] 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.

[0154] 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. Industrial applicability

[0155] By sharing a single data signal distributor among multiple reflective display panels, the data signal distributor can distribute the data driving signal input from the data driver chip to the data lines on the corresponding reflective display panel. This allows multiple reflective display panels to share the data driver chip, thereby reducing the number of data driver chips and lowering manufacturing costs.

Claims

1. A reflective display device, characterized in that, include: Multiple reflective display panels are stacked on top of each other, and each of the reflective display panels has a data line; A data driver chip (41) and a data signal distributor (42) are provided. The data driver chip (41) is electrically connected to the data signal distributor (42) and is used to input data driving signals to the data signal distributor (42). The data lines on the plurality of reflective display panels are all electrically connected to the same data signal distributor (42). The data signal distributor (42) is used to distribute the data driving signals to the corresponding data lines on the reflective display panels.

2. The reflective display device according to claim 1, characterized in that, Of the plurality of reflective display panels, the one furthest from the external environment is a cholesteric liquid crystal reflective display panel or an electrophoretic reflective display panel, and the remaining reflective display panels are all cholesteric liquid crystal reflective display panels.

3. The reflective display device according to claim 2, characterized in that, The number of reflective display panels is three. The three reflective display panels are, in order, a first reflective display panel (10), a second reflective display panel (20), and a third reflective display panel (30) facing the external environment. When in a reflective state, the first reflective display panel (10), the second reflective display panel (20), and the third reflective display panel (30) reflect a first color light, a second color light, and a third color light, respectively. The first color light, the second color light, and the third color light are one of red light, blue light, and green light, respectively.

4. The reflective display device according to claim 1, characterized in that, The reflective display device includes a data signal circuit board (43), one end of which is electrically connected to the data signal distributor (42), and the other end is electrically connected to the data line on the reflective display panel.

5. The reflective display device according to claim 4, characterized in that, The data signal circuit board (43) is provided with multiple data signal branch circuit boards, and the data signal branch circuit boards are electrically connected to the reflective display panel one by one; or, the number of data signal circuit boards (43) is multiple, and the data signal circuit boards (43) are electrically connected to the reflective display panel one by one.

6. The reflective display device according to any one of claims 1-5, characterized in that, Each of the reflective display panels has scanning lines, and the reflective display device includes: A scan driver chip (51) and a scan signal distributor (52) are provided. The scan driver chip (51) is electrically connected to the scan signal distributor (52) and is used to input scan drive signals to the scan signal distributor (52). The scan lines on the plurality of reflective display panels are all electrically connected to the same scan signal distributor (52). The scan signal distributor (52) is used to distribute the scan drive signals to the corresponding scan lines on the reflective display panels.

7. The reflective display device according to claim 6, characterized in that, The reflective display device includes a scanning signal circuit board (53), one end of which is electrically connected to the scanning signal distributor (52), and the other end is electrically connected to the scanning line on the reflective display panel.

8. The reflective display device according to claim 7, characterized in that, The scanning signal circuit board (53) is provided with multiple scanning signal branch circuit boards, and the scanning signal branch circuit boards are connected to the reflective display panel one by one; Alternatively, there may be multiple scanning signal circuit boards (53), and each scanning signal circuit board (53) may be electrically connected to the reflective display panel in a one-to-one correspondence.

9. The reflective display device according to any one of claims 1-5, characterized in that, Each of the reflective display panels has scanning lines, and the reflective display device includes: Multiple scanning driver chips (51) are electrically connected to the reflective display panel one-to-one. The scanning driver chip (51) is used to directly input the scanning driving signal to the corresponding scanning line on the reflective display panel.

10. The reflective display device according to any one of claims 1-5, characterized in that, The reflective display device further includes a color correction circuit, which is electrically connected to the data signal distributor (42) and is used to adjust the color output of each of the reflective display panels.

11. A driving method for a reflective display device, characterized in that, The driving method for driving the reflective display device as described in any one of claims 1-10 includes: The data driver chip (41) inputs a data driver signal to the data signal distributor (42); The data signal distributor (42) is controlled to distribute the corresponding data drive signal to the data lines on each of the reflective display panels.

12. The driving method for the reflective display device according to claim 11, characterized in that, The driving method includes: controlling the data signal distributor (42) to simultaneously distribute the corresponding data driving signal to the data lines on each of the reflective display panels; Alternatively, the data signal distributor (42) can be controlled to sequentially distribute the corresponding data driving signals to the data lines on each of the reflective display panels.

13. The driving method for the reflective display device according to claim 12, characterized in that, Each of the reflective display panels has a scanning line. The reflective display device includes a scanning driver chip (51) and a scanning signal distributor (52). The scanning driver chip (51) is electrically connected to the scanning signal distributor (52) and is used to input a scanning driving signal to the scanning signal distributor (52). The scanning lines on the multiple reflective display panels are all electrically connected to the same scanning signal distributor (52). The scanning signal distributor (52) is used to distribute the scanning driving signal to the corresponding scanning line on the reflective display panel. The driving method includes: When the data signal distributor (42) is controlled to distribute the corresponding data driving signal to the data lines on each of the reflective display panels, the scan signal distributor (52) is simultaneously controlled to distribute the corresponding scan driving signal to the scan lines on the reflective display panels that distribute the data driving signal.

14. The driving method for the reflective display device according to claim 12, characterized in that, Each of the reflective display panels has a scanning line, and the reflective display device includes a plurality of scanning driving chips (51). The scanning driving chips (51) are electrically connected to the reflective display panels one by one, and the scanning driving chips (51) are used to input the scanning driving signal to the scanning line on the corresponding reflective display panel. The driving method includes: When the control data signal distributor (42) distributes the corresponding data driving signal to the data lines on each of the reflective display panels, it simultaneously controls the corresponding scan driving chip (51) to input the corresponding scan driving signal to the scan line on the reflective display panel that distributes the data driving signal.

15. The driving method for the reflective display device according to any one of claims 11-14, characterized in that, The reflective display device further includes a color correction circuit, which is electrically connected to the data signal distributor (42) and is used to adjust the color output of each of the reflective display panels; The driving method includes: Based on the color response range of each of the reflective display panels, the data driving signal is mapped to the color space of the reflective display device for compression or expansion processing. Based on the transition relationship between different colors, the parameters of the mapping algorithm are adjusted, and the data driving signal corresponding to each of the reflective display panels is adjusted by color interpolation or curve fitting. Based on the color response characteristics and color space standards of each of the reflective display panels, a second difference adjustment is performed by calling a calibration curve or lookup table and dynamically adjusting the data driving signal corresponding to each of the reflective display panels. The system acquires ambient light levels, monitors the color output brightness and color saturation of each of the reflective display panels, monitors the rate of change of color brightness and the rate of change of color protection in the color transition area, adjusts the data driving signal that exceeds a preset rate of change threshold, and performs a third differential adjustment on the data driving signal corresponding to each of the reflective display panels based on the standard parameters of the display mode of the reflective display device. The color transition region of the data driving signal is determined, and the color gradient difference of the color transition region is weighted and corrected according to the color transition requirements of different color display regions. The color transition path is smoothed in the color space to perform a fourth difference adjustment on the data driving signal corresponding to each of the reflective display panels.

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