Reflective display device and driving method

Abstract

The invention discloses a reflective display device and a driving method, the reflective display device comprises a plurality of reflective display panels which are mutually stacked, and each reflective display panel is provided with a data line; the data driving chip is electrically connected with the data signal distributor and is used for inputting a data driving signal to the data signal distributor, and the data lines on the plurality of reflective display panels are electrically connected with the same data signal distributor; and the data signal distributor is used for distributing the data driving signals to the data lines on the corresponding reflective display panels. A plurality of reflective display panels share one data signal distributor, and the data signal distributor can distribute data driving signals input by a data driving chip to data lines on the corresponding reflective display panels, so that the plurality of reflective display panels can share the data driving chip; the number of data driving chips is reduced, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of displays, and in particular to a reflective display device and a driving method. Background Art

[0002] Display panels are thin, durable, and energy-saving and environmentally friendly with low power consumption, but they need to be used with a backlight, resulting in thick modules and high costs. Electronic paper displays (reflective displays) have become a type of display that meets the needs of the public. Electronic paper displays can use external light sources to display images, unlike LCD displays that require backlights. Therefore, in outdoor environments with strong sunlight, the information on the electronic paper can still be clearly seen without viewing angle issues. In addition, electronic paper displays are now widely used in electronic readers (such as e-books, e-newspapers) or other electronic components (such as price tags) due to their advantages such as power saving, high reflectivity and contrast ratio.

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

[0004] Technical issues

[0005] In the prior art, a cholesteric liquid crystal reflective display is used. Due to the requirements of the cholesteric liquid crystal pitch, a cholesteric liquid crystal of a certain pitch can only reflect one color and transmit light of other colors. If full-color reflective display is required, a three-layer liquid crystal box architecture needs to be used to achieve full-color reflective display through the color mixing principle of the three-layer liquid crystal box. Since the three liquid crystal boxes need to control different reflective states respectively, most of the existing liquid crystal box packaging forms are COG (Chip On Glass), COF (Chip On Flex or Chip On Film, etc. Therefore, three scanning driver chips and three data driver chips are required for control, which is not conducive to product miniaturization and has a high production cost. Among them, since different color images need to be displayed, the grayscale signals on each liquid crystal box are different. Therefore, how to reduce the number of data driver chips is a major problem in this field.

[0006] Technical Solution In order to overcome the shortcomings and deficiencies in the prior art, the object of the present invention is to provide a reflective display device and a driving method to solve the problem that the reflective display device in the prior art uses a large number of driving chips and has a high cost. The object of the present invention is achieved through the following technical solutions:

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

[0008] A plurality of reflective display panels stacked on each other, each of the reflective display panels having a data circuit;

[0009] A data driving chip and a data signal distributor, wherein the data driving 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 multiple reflective display panels are all electrically connected to the same data signal distributor, and the data signal distributor is used to distribute the data driving signal to the corresponding data lines on the reflective display panels.

[0010] Furthermore, the reflective display panel farthest from the external environment among the multiple reflective display panels is a cholesteric liquid crystal reflective display panel or an electrophoretic reflective display panel, and the other reflective display panels are all cholesteric liquid crystal reflective display panels.

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

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

[0013] Furthermore, the data signal circuit board is provided with a plurality of data signal branch circuit boards, and the data signal branch circuit boards are electrically connected to the reflective display panels in a one-to-one correspondence;

[0014] Alternatively, there are multiple data signal circuit boards, and the data signal circuit boards are electrically connected to the reflective display panels in a one-to-one correspondence.

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

[0016] A scan driver chip and a scan signal distributor, wherein the scan driver chip is electrically connected to the scan signal distributor and is used to input a scan driver signal to the scan signal distributor, the scan lines on the multiple reflective display panels are all electrically connected to the same scan signal distributor, and the scan signal distributor is used to distribute the scan driver signal to the corresponding scan lines on the reflective display panels.

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

[0018] Furthermore, the scan signal circuit board is provided with a plurality of scan signal branch circuit boards, and the scan signal branch circuit boards are connected to the reflective display panels in a one-to-one correspondence;

[0019] Alternatively, there are multiple scan signal circuit boards, and the scan signal circuit boards are electrically connected to the reflective display panels in a one-to-one correspondence.

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

[0021] A plurality of scan driving chips are electrically connected to the reflective display panels in a one-to-one correspondence, and the scan driving chips are used to directly input the scan driving signal to the scan line corresponding to the reflective display panel.

[0022] Furthermore, the reflective display device further comprises 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] The present application also provides a driving method of a reflective display device, which is used to drive the reflective display device as described above, and the driving method includes:

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

[0025] The data signal distributor is controlled to distribute the corresponding data driving 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] Or, the data signal distributor is controlled to distribute the corresponding data driving signal to the data lines on each of the reflective display panels in sequence.

[0028] Further, each of the reflective display panels has a scan circuit, and the reflective display device includes a scan driver chip and a scan signal distributor, wherein the scan driver chip is electrically connected to the scan signal distributor and is used to input a scan driver signal to the scan signal distributor, and the scan circuits on the plurality of reflective display panels are electrically connected to the same scan signal distributor, and the scan signal distributor is used to distribute the scan driver signal to the scan circuits on the corresponding reflective display panels;

[0029] The driving method comprises:

[0030] When the data signal distributor is controlled to distribute the corresponding data drive signal to the data lines on each of the reflective display panels, the scan signal distributor is simultaneously controlled to distribute the corresponding scan drive signal to the scan line on the reflective display panel to which the data drive signal is distributed.

[0031] Further, each of the reflective display panels has a scan circuit, and the reflective display device includes a plurality of scan driver chips, the scan driver chips are electrically connected to the reflective display panels one by one, and the scan driver chips are used to input the scan driver signal to the scan circuit on the corresponding reflective display panel;

[0032] The driving method comprises:

[0033] When the data signal distributor is controlled to distribute the corresponding data driving signal to the data lines on each reflective display panel, the corresponding scanning driving chip is simultaneously controlled to input the corresponding scanning driving signal to the scanning line on the reflective display panel to which the data driving signal is distributed.

[0034] Furthermore, the reflective display device further comprises 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 comprises:

[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, and based on the transition relationship between different colors, the parameters of the mapping algorithm are adjusted to perform a first difference adjustment on the data driving signal corresponding to each of the reflective display panels through a color interpolation method or a curve fitting method;

[0037] Based on the color response characteristics and color space standard of each of the reflective display panels, calling a correction curve or a lookup table, and performing a second difference adjustment by dynamically adjusting the data drive signal corresponding to each of the reflective display panels;

[0038] Acquiring an ambient light level, monitoring the color output brightness and color saturation of each of the reflective display panels, monitoring the color brightness change rate and color protection change rate of a color transition area, adjusting the data drive signal exceeding a preset change rate threshold, and performing a third difference adjustment on the data drive signal corresponding to each of the reflective display panels based on a display mode standard parameter of the reflective display device;

[0039] Determine the color transition area of ​​the data driving signal, perform weighted correction on the color gradient difference of the color transition area according to the color transition requirements of different color display areas, and smoothly adjust the color transition path in the color space to perform a fourth difference adjustment on the data driving signal corresponding to each of the reflective display panels.

[0040] Beneficial Effects

[0041] By having multiple reflective display panels share a data signal distributor, the data signal distributor can distribute the data driving signal input by the data driving chip to the data line on the corresponding reflective display panel, so that multiple reflective display panels can share the data driving chip to reduce the number of data driving chips and reduce the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the planar structure of the reflective display device in the first embodiment of the present invention.

[0043] Figure 2 It is a schematic diagram of the circuit structure of the data driving signal on the reflective display device in the first embodiment of the present invention.

[0044] Figure 3 It is a schematic diagram of the circuit structure of the scanning driving signal on the reflective display device in the first embodiment of the present invention.

[0045] Figure 4 It is a schematic diagram of the principle of the signal distributor in the first embodiment of the present invention.

[0046] Figure 5 1 is a schematic structural diagram of the reflective display device in the initial state in the first embodiment of the present invention.

[0047] Figure 6 It is a schematic diagram of the planar structure of the first array substrate in the first embodiment of the present invention.

[0048] Figure 7 It is a schematic diagram of the planar structure of the second array substrate in the first embodiment of the present invention.

[0049] Figure 8 It is a schematic diagram of the planar structure of the third array substrate in the first embodiment of the present invention.

[0050] Fig. 9 It is a schematic diagram of the principle of the transformation of the three states of the cholesteric liquid crystal in the first embodiment of the present invention.

[0051] Fig.10 It is a schematic diagram of the driving signal for the three-state transformation of the cholesteric liquid crystal in the first embodiment of the present invention.

[0052] Fig.11 It is a schematic structural diagram of the reflective display device in the first embodiment of the present invention when displaying a red picture.

[0053] Fig.12 It is a schematic structural diagram of the reflective display device in the first embodiment of the present invention when displaying a green picture.

[0054] Fig.13 It is a schematic structural diagram of the reflective display device in the first embodiment of the present invention when displaying a blue picture.

[0055] Fig.14 Schematic diagram of the structure of the reflective display device in the white state in the first embodiment of the present invention.

[0056] Fig.15 Schematic diagram of the structure of the reflective display device in the black state in the first embodiment of the present invention.

[0057] Fig.16 It is a schematic diagram of the planar structure of the reflective display device in the second embodiment of the present invention.

[0058] Fig.17 It is a schematic diagram of the circuit structure of the scanning driving signal on the reflective display device in the second embodiment of the present invention.

[0059] Fig.18 Schematic diagram of the structure of the reflective display device in the third embodiment of the present invention in the white state.

[0060] Fig.19 3 is a schematic diagram of the structure of the reflective display device in the black state in the third embodiment of the present invention.

[0061] Embodiments of the present invention

[0062] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the reflective display device and driving method proposed by the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments:

[0063] [Example 1]

[0064] Figure 1 It is a schematic diagram of the planar structure of the reflective display device in the first embodiment of the present invention. Figure 2 It is a schematic diagram of the circuit structure of the data driving signal on the reflective display device in the first embodiment of the present invention. Figure 3 It is a schematic diagram of the circuit structure of the scanning driving signal on the reflective display device in the first embodiment of the present invention.

[0065] like Figures 1 to 3 As shown, a reflective display device provided in Embodiment 1 of the present invention comprises: a plurality of reflective display panels stacked on each other, each reflective display panel having a data circuit. The data circuit comprises a plurality of data lines ( Figure 6-Figure 8 The first data line 102, the second data line 202, and the third data line 302 in the display are used to apply a data driving signal to the reflective display panel through the data line.

[0066] The data driver chip 41 and the data signal distributor 42 are electrically connected to the data signal distributor 42 and are used to input a data driver signal (e.g., a grayscale signal) to the data signal distributor 42. The number of the data driver chip 41 and the data signal distributor 42 is one, and the data lines on the multiple reflective display panels are electrically connected to the same data signal distributor 42. The data signal distributor 42 is used to distribute the data driver signal to the data lines on the corresponding reflective display panels. By sharing one data signal distributor 42 with multiple reflective display panels, the data signal distributor 42 can distribute the data driver signal input by the data driver chip 41 to the data lines on the corresponding reflective display panels, so that multiple reflective display panels can share the data driver chip 41, so as to reduce the number of data driver chips and reduce the manufacturing cost.

[0067] Furthermore, the reflective display panel farthest from the external environment among the multiple reflective display panels is a cholesteric liquid crystal reflective display panel or an electrophoretic reflective display panel, and the remaining reflective display panels are cholesteric liquid crystal reflective display panels. In this embodiment, all reflective display panels are cholesteric liquid crystal reflective display panels.

[0068] Figure 5Schematic diagram of the structure of the reflective display device in the initial state in the first embodiment of the present invention. Figure 5 As shown, there are three reflective display panels, and the three reflective display panels are sequentially a first reflective display panel 10, a second reflective display panel 20, and a third reflective display panel 30 in the direction toward the external environment, that is, the third reflective display panel 30 is closest to the external environment, the first reflective display panel 10 is farthest 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, and the ambient light of the external environment is sequentially incident on the third reflective display panel 30, the second reflective display panel 20, and the first reflective display panel 10. Among them, the first reflective display panel 10, the second reflective display panel 20, and the third reflective display panel 30 respectively reflect the first color light, the second color light, and the third color light in the reflective state, and the first color light, the second color light, and the third color light are lights of different colors, and the first color light, the second color light, and the third color light are respectively one of red light, blue light, and green light, and the full-color picture display is realized according to the principle of mixing the three primary colors of light. Of course, in other embodiments, the number of reflective display panels can also be two, but the color gamut of the color picture is low and full-color picture display cannot be achieved; alternatively, one of the reflective display panels can reflect two colors of light in the reflective state, thereby achieving full-color picture display, but the manufacturing process of the reflective display panel that reflects two colors of light is more difficult and the cost is higher.

[0069] 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 may be provided on the side of the reflective display device away from the external environment, for example, a light absorbing layer may be provided on the side of the first reflective display panel 10 away from the external environment, so that the light passing through the first reflective display panel 10, the second reflective display panel 20 and the third reflective display panel 30 may be absorbed, so that the reflective display device is darker in the black state, so as to improve the contrast.

[0070] 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, and the first cholesteric liquid crystal layer 13 is used to reflect the first color light in the reflective state. 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, and the second cholesteric liquid crystal layer 23 is used to reflect the second color light in the reflective state. 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, and the third cholesteric liquid crystal layer 33 is used to reflect the third color light in the reflective state. Among them, in the direction toward the external environment, there are the first array substrate 12, the first cholesteric liquid crystal layer 13, the first opposing substrate 11, the second array substrate 22, the second cholesteric liquid crystal layer 23, the second opposing substrate 21, the third array substrate 32, the third cholesteric liquid crystal layer 33 and the third opposing substrate 31 in order.

[0071] A first pixel electrode 121 is provided on the first array substrate 12, and a first common electrode 111 matched with the first pixel electrode 121 is provided on the first opposing substrate 11, and the first cholesteric liquid crystal layer 13 is controlled to switch between a reflective state and a light-transmitting state by 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 matched with the second pixel electrode 221 is provided on the second opposing substrate 21, and the second cholesteric liquid crystal layer 23 is controlled to switch between a reflective state and a light-transmitting state by 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 matched with the third pixel electrode 321 is provided on the third opposing substrate 31, and the third cholesteric liquid crystal layer 33 is controlled to switch between a reflective state and a light-transmitting state by the third pixel electrode 321 and the third common electrode 311. Among them, the first common electrode 111, the second common electrode 211 and the third common electrode 311 are all planar electrodes covering the entire surface.

[0072] Figure 6 Schematic diagram of the planar structure of the first array substrate in the first embodiment of the present invention. Figure 6As shown, a plurality of first scan lines 101 and a plurality of first data lines 102 are provided on the first array substrate 12, and the plurality of first scan lines 101 and the plurality of first data lines 102 are insulated from each other and cross to define a plurality of first pixel units P1. The first array substrate 12 is provided with a first thin film transistor 103 and a first pixel electrode 121 in each first pixel unit P1, and 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 is located in the same layer as the first scan line 101 and is electrically connected, the first gate is separated from the first active layer by an insulating layer, the first source is electrically connected to the first data line 102, and the first drain is electrically connected to the first pixel electrode 121 through a contact hole.

[0073] Figure 7 Schematic diagram of the planar structure of the second array substrate in the first embodiment of the present invention. Figure 7 As shown, a plurality of second scan lines 201 and a plurality of second data lines 202 are provided on the second array substrate 22, and the plurality of second scan lines 201 and the plurality of second data lines 202 are insulated from each other and cross to define a plurality of second pixel units P2. The second array substrate 22 is provided with a second thin film transistor 203 and a second pixel electrode 221 in each second pixel unit P2, and 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 is located in the same layer as the second scan line 201 and is electrically connected, the second gate is separated from the second active layer by an insulating layer, the second source is electrically connected to the second data line 202, and the second drain is electrically connected to the second pixel electrode 221 through a contact hole.

[0074] Figure 8 Schematic diagram of the planar structure of the third array substrate in the first embodiment of the present invention. Figure 8As shown, a plurality of third scan lines 301 and a plurality of third data lines 302 are provided on the third array substrate 32, and the plurality of third scan lines 301 and the plurality of third data lines 302 are insulated from each other and cross to define a plurality of third pixel units P3. The third array substrate 32 is provided with a third thin film transistor 303 and a third pixel electrode 321 in each third pixel unit P3, and 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 is located in the same layer as the third scan line 301 and is electrically connected, the third gate is separated from the third active layer by an insulating layer, the third source is electrically connected to the third data line 302, and the third drain is electrically connected to the third pixel electrode 321 through a contact hole.

[0075] The projections of the first pixel unit P1, the second pixel unit P2 and the third pixel unit P3 on the third array substrate 32 are aligned with each other, so that three colors of light can be reflected in one sub-pixel (pixel unit), that is, one sub-pixel forms one pixel, so as to increase the resolution of the reflective display panel.

[0076] The first counter substrate 11, the first array substrate 12, the second counter substrate 21, the second array substrate 22, the third counter substrate 31 and the third array substrate 32 may be made of materials such as glass, acrylic acid and polycarbonate. 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 may be made of materials such as indium tin oxide (ITO) or indium zinc oxide (IZO).

[0077] 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 is used to reflect red light in the reflective state, 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. 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 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 red light; or, the first color light may be green light, the second color light may be red light, and the third color light may be blue light.

[0078] The cholesteric liquid crystal in the cholesteric liquid crystal layer (the first cholesteric liquid crystal layer 13, the second cholesteric liquid crystal layer 23, and the third cholesteric liquid crystal layer 33) has three stable textures: P state (Planar, planar texture state, reflective state), FC state (Focal Conic, focal conic state, foggy state) and H state (transparent state), wherein the FC state (Focal Conic, focal conic state, foggy state) and H state (transparent state) are both light-transmitting states. In the P state, the reflection spectrum of the cholesteric liquid crystal is in the visible spectrum, and the cholesteric liquid crystal reflects bright colored light, and its specific reflected color can be set according to the pitch of the cholesteric liquid crystal; in the FC state, the cholesteric liquid crystal no longer reflects the above colored light, and the light can be scattered and passed through the cholesteric liquid crystal; in the H state, the cholesteric liquid crystal no longer reflects the above colored light, and the light can directly pass through the cholesteric liquid crystal, and it does not have a scattering effect on the light. Under the action of a certain electric field, these three states can be converted into each other. Among them, the P state (Planar, planar texture state, reflective state) and FC state (Focal Conic, focal conic state, foggy state) are stable textures. They do not require voltage to maintain, while the H state (transparent state) requires voltage to maintain.

[0079] Fig. 9 It is a schematic diagram of the principle of the transformation of the three states of the cholesteric liquid crystal in the first embodiment of the present invention. Fig.10 Schematic diagram of the driving signal for the three states of the cholesteric liquid crystal in the first embodiment of the present invention. Fig. 9 and Fig.10As shown, a common voltage signal Vcom is applied to the common electrodes (the first common electrode 111, the second common electrode 211, and the third common electrode 311), and a first electrical signal V1 is continuously applied to the pixel electrodes (the first pixel electrode 121, the second pixel electrode 221, and the third pixel electrode 321), and a voltage difference (for example, 16V) is formed between the common voltage signal Vcom and the first electrical signal V1, and a strong vertical electric field is formed between the common electrode and the pixel electrode, and the cholesteric liquid crystal in the cholesteric liquid crystal layer 13 rotates and stagnates in the H state (transparent state); a common voltage signal Vcom is applied to the common electrodes, and a second electrical signal V2 is applied to the pixel electrodes, and a voltage difference (for example, 16V) is formed between the second electrical signal V2 and the common voltage signal Vcom, and 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 first formed between the common electrode and the pixel electrode, and then the vertical electric field disappears slowly, causing the cholesteric liquid crystal in the cholesteric liquid crystal layer 13 to rotate and stagnate in the FC state, which is a scattering state and has a light-scattering effect; a common voltage signal Vcom is applied to the common electrode, and a third electric signal V3 is applied to the pixel electrode, and there is a voltage difference (for example, 16V) between the third electric signal V3 and the common voltage signal Vcom, and the third electric signal V3 directly becomes the same as the common voltage signal Vcom at the second preset time, and the second preset time is less than the first preset time, that is, the third electric signal V3 first has a large voltage difference with the common voltage signal Vcom, and then quickly decreases and becomes the same as the common voltage signal Vcom. Therefore, a strong vertical electric field is first formed between the common electrode and the pixel electrode, and then the vertical electric field disappears quickly, causing the cholesteric liquid crystal in the cholesteric liquid crystal layer 13 to rotate and stagnate in the P state, which is a reflection state. Among them, the arrangement direction of the cholesteric liquid crystal is different, the reflected visible light spectrum is different, and the remaining spectrum is transmitted. The reflection spectrum band (Δλ) of cholesteric liquid crystal is proportional to the helical pitch (Po) and birefringence (Δn=ne-no) of cholesteric liquid crystal, and the formula is: Δλ=PoΔn. Therefore, cholesteric liquid crystals with different helical pitches can reflect light of different colors in the reflection state. The P state and FC state do not require voltage to maintain.

[0080] like Figure 1As shown, the reflective display device includes a data signal circuit board 43, one end of the data signal circuit board 43 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. The data signal circuit board 43 can be a flexible circuit board (FPC, Flexible Printed Circuit Board), and the data signal distributor 42 transmits a data drive signal to the data line on the reflective display panel through the data signal circuit board 43. For example, a binding area is provided at the edge of each reflective display panel, and the data line extends from the display area to the binding area. The data signal circuit board 43 is bound to the binding area at the edge of the reflective display panel, thereby achieving electrical connection with the data line.

[0081] Furthermore, the data signal circuit board 43 is provided with a plurality of data signal branch circuit boards, and the data signal branch circuit boards are electrically connected to the reflective display panels one by one. Therefore, the number of data signal circuit boards 43 is the same as that of the 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, thereby reducing the manufacturing cost. Figure 1 and Figure 6-Figure 8 As shown, there are three data signal branch circuit boards, namely 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, wherein an end of the first data signal branch circuit board 431 away from the data signal distributor 42 is further bound (electrically connected) to the data circuit (first data line 102) on the first reflective display panel 10, an end of the second data signal branch circuit board 432 away from the data signal distributor 42 is further bound to the data circuit (second data line 202) on the second reflective display panel 20, and an end of the third data signal branch circuit board 433 away from the data signal distributor 42 is further bound to the data circuit (third data line 302) on the third reflective display panel 30. Of course, in other embodiments, the number of data signal circuit boards 43 can also be multiple, and the data signal circuit boards 43 are electrically connected to the reflective display panels one by one, that is, each reflective display panel is separately provided with a data signal circuit board 43 to transmit signals with the data signal distributor 42, but the number of binding times of the data signal circuit board 43 and the data signal distributor 42 will increase.

[0082] In this embodiment, each reflective display panel has a scanning circuit, and the scanning circuit includes a plurality of scanning lines ( Figure 6-Figure 8 The first scanning line 101, the second scanning line 201, and the third scanning line 301 in the reflective display panel are applied with a scanning driving signal through the scanning line, so that the thin film transistors ( Figure 6-Figure 8The first thin film transistor 103, the second thin film transistor 203, and the third thin film transistor 303 in the reflective display panel are turned on to ensure that the scanning circuit can apply a scanning drive signal to the pixel electrodes (the first pixel electrode 121, the second pixel electrode 221, and the third pixel electrode 321) on the corresponding reflective display panel.

[0083] like Figure 1 and Figure 3 As shown, the reflective display device further includes: a scan drive chip 51 and a scan signal distributor 52. The scan drive chip 51 is electrically connected to the scan signal distributor 52 and is used to input a scan drive signal 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 signal to the scan lines on the corresponding reflective display panels. By having multiple reflective display panels share one scan signal distributor 52, the scan signal distributor 52 can distribute the scan drive signal input by the scan drive chip 51 to the scan lines on the corresponding reflective display panels, so that multiple reflective display panels can share the scan drive chip 51, thereby reducing the number of scan drive chips and reducing the manufacturing cost.

[0084] Furthermore, the reflective display device includes a scan signal circuit board 53, one end of the scan signal circuit board 53 is electrically connected to the scan signal distributor 52, and the other end is electrically connected to the scan circuit 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 a scan drive signal to the scan circuit on the reflective display panel through the scan signal circuit board 53. For example, a binding area is provided at the edge of each reflective display panel, and the scan circuit extends from the display area to the binding area. The scan signal circuit board 53 is bound to the binding area at the edge of the reflective display panel, thereby achieving electrical connection with the scan circuit.

[0085] The scanning signal circuit board 53 is provided with a plurality of scanning signal branch circuit boards, and the scanning signal branch circuit boards are connected to the reflective display panels one by one. Therefore, the number of scanning signal circuit boards 53 is the same as that of the scanning signal distributors 52, 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, thereby reducing the manufacturing cost. In this embodiment, if Figure 1 and Figure 6-Figure 8As shown, there are three scan signal branch circuit boards, namely a first scan signal branch circuit board 531, a second scan signal branch circuit board 532 and a third scan signal branch circuit board 533, wherein the end of the first scan signal branch circuit board 531 away from the scan signal distributor 52 is further bound (electrically connected) to the scan circuit (first scan line 101) on the first reflective display panel 10, the end of the second scan signal branch circuit board 532 away from the scan signal distributor 52 is further bound to the scan circuit (second scan line 201) on the second reflective display panel 20, and the end of the third scan signal branch circuit board 533 away from the scan signal distributor 52 is further bound to the scan circuit (third scan line 301) on the third reflective display panel 30. Of course, in other embodiments, the number of scanning signal circuit boards 53 can also be multiple, and the scanning signal circuit boards 53 are electrically connected to the reflective display panels one by one, that is, each reflective display panel is separately provided with a scanning signal circuit board 53 to transmit signals with the scanning signal distributor 52, but the number of binding times between the scanning signal circuit board 53 and the scanning signal distributor 52 will increase.

[0086] Figure 4 Schematic diagram of the principle of the signal distributor in the first embodiment of the present invention. Figure 4As shown, 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 a signal from a signal source to multiple different channels as needed. The signal distribution function is called a signal distributor. Its function is equivalent to a single-pole multi-throw switch with multiple outputs. The circuit that can transmit an input signal to any output end of m output ends as needed is called a signal distributor, also known as a multiplexer, and its logical function is exactly the opposite of the 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 signal input by the data driving chip 41 is Va / Vb / Vc, and 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 line (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 line (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 line (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. Figure 6-Figure 8 The scanning drive signal of each reflective display panel is the same. The scanning drive chip 51 only needs to input a scanning drive signal to the scanning signal distributor 52, and then the scanning signal distributor 52 distributes a scanning drive signal input by the scanning drive chip 51 to the scanning line on the corresponding reflective display panel according to the control signal applied by the driving chip (scanning drive chip 51) or the central processing unit.

[0087] The following description is based on the assumption that the cholesteric liquid crystal layers (the first cholesteric liquid crystal layer 13, the second cholesteric liquid crystal layer 23, and the third cholesteric liquid crystal layer 33) are all in the reflective state in the initial state, and the light-transmitting state is the FC state (Focal Conic, focal conic state, fog state). The light-transmitting state is the FC state, which can save power consumption during static reflective display. Of course, in other embodiments, the cholesteric liquid crystal layers (the first cholesteric liquid crystal layer 13, the second cholesteric liquid crystal layer 23, and the third cholesteric liquid crystal layer 33) can also be in the light-transmitting state (for example, the FC state (Focal Conic, focal conic state, fog state)) in the initial state. Alternatively, the light-transmitting state can also be the H state (transparent state), but the power consumption is higher.

[0088] Fig.11 Schematic diagram of the structure of the reflective display device in the first embodiment of the present invention when displaying a red image. Fig.11 As shown, when displaying a red picture, the first common electrode 111, the second common electrode 211 and the third common electrode 311 are all applied with a common voltage of 0V, the second pixel electrode 221 and the third pixel electrode 321 are all applied with a grayscale voltage, and then the voltage is slowly reduced to 0, so as to control the second cholesteric liquid crystal layer 23 and the third cholesteric liquid crystal layer 33 to be in a light-transmitting state. No voltage is applied to the first pixel electrode 121, so as to control the first cholesteric liquid crystal layer 13 to be in a reflective state and reflect the first color light, i.e., reflect red light. That is, the data signal distributor 42 distributes the data driving signal in the light-transmitting state to the second reflective display panel 20 and the third reflective display panel 30, and distributes the data driving signal in the reflective state to the first reflective display panel 10 according to the control signal applied by the driving chip or the central processing unit.

[0089] Fig.12 Schematic diagram of the structure of the reflective display device in the first embodiment of the present invention when displaying a green picture. Fig.12 As shown, when displaying a green picture, the first common electrode 111, the second common electrode 211 and the third common electrode 311 are all applied with a common voltage of 0V, the first pixel electrode 121 and the third pixel electrode 321 are all applied with a grayscale voltage, and then the voltage is slowly reduced to 0, so as to control the first cholesteric liquid crystal layer 13 and the third cholesteric liquid crystal layer 33 to be in a light-transmitting state. No voltage is applied to the second pixel electrode 221, so as to control the second cholesteric liquid crystal layer 23 to be in a reflective state and reflect the second color light, i.e., reflect green light. That is, the data signal distributor 42 distributes the data driving signal in the light-transmitting state to the first reflective display panel 10 and the third reflective display panel 30, and distributes the data driving signal in the reflective state to the second reflective display panel 20 according to the control signal applied by the driving chip or the central processing unit.

[0090] Fig.13 Schematic diagram of the structure of the reflective display device in the first embodiment of the present invention when displaying a blue picture. Fig.13 As shown, when displaying a blue picture, the first common electrode 111, the second common electrode 211 and the third common electrode 311 are all applied with a common voltage of 0V, the first pixel electrode 121 and the second pixel electrode 221 are all applied with a grayscale voltage, and then the voltage is slowly reduced to 0, so as to control the first cholesteric liquid crystal layer 13 and the second cholesteric liquid crystal layer 23 to be in a light-transmitting state. No voltage is applied to the third pixel electrode 321, so as to control the third cholesteric liquid crystal layer 33 to be in a reflective state and reflect the third color light, i.e., reflect blue light. That is, the data signal distributor 42 distributes the data driving signal in the light-transmitting state to the first reflective display panel 10 and the second reflective display panel 20, and distributes the data driving signal in the reflective state to the third reflective display panel 30 according to the control signal applied by the driving chip or the central processing unit.

[0091] Fig.14 Schematic diagram of the structure of the reflective display device in the white state in the first embodiment of the present invention. Fig.14 As shown, when displaying a white state picture, the first common electrode 111, the second common electrode 211 and the third common electrode 311 are all applied with a common voltage of 0V, and the first pixel electrode 121, the second pixel electrode 221 and the third pixel electrode 321 are all not applied with a voltage, and the first cholesteric liquid crystal layer 13 is controlled to be in a reflective state and reflect the first color light, that is, reflect red light; the second cholesteric liquid crystal layer 23 is controlled to be in a reflective state and reflect the second color light, that is, 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, that is, reflect blue light, so that the reflective display device presents a white state picture. That is, the data signal distributor 42 distributes the reflective state 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 driving chip or the central processing unit.

[0092] Fig.15 Schematic diagram of the structure of the reflective display device in the black state in the first embodiment of the present invention. Fig.15As shown, when displaying a black state image, the first common electrode 111, the second common electrode 211 and the third common electrode 311 are all applied with a 0V common voltage, the first pixel electrode 121, the second pixel electrode 221 and the third pixel electrode 321 are all applied with a grayscale voltage, and then the voltage is slowly reduced to 0, the first cholesteric liquid crystal layer 13, the second cholesteric liquid crystal layer 23 and the third cholesteric liquid crystal layer 33 are controlled to be in a light-transmitting state, and the ambient light sequentially passes through the third reflective display panel 30, the second reflective display panel 20 and the first reflective display panel 10, so that the reflective display device presents a black state image. That is, the data signal distributor 42 distributes the light-transmitting state 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 driving chip or the central processing unit.

[0093] Among them, when it is necessary to realize a color picture, 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 by the first cholesteric liquid crystal layer 13, the second cholesteric liquid crystal layer 23 and the third cholesteric liquid crystal layer 33, and realize full-color picture display according to 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 all use the same data driver chip 41 and data signal distributor 42, the data drive signal actually transmitted to the reflective display panel will inevitably deviate, resulting in picture distortion. The color correction circuit can be used to correct the data drive signal to improve the displayed image quality.

[0094] Optionally, some correction elements or circuits can be integrated into the hardware design of the driver chip or the reflective display device as a color correction circuit to optimize the color effect. 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 drive circuit of the reflective display device to ensure the consistency of the response time during the color transition process, thereby achieving a smooth and continuous color transition effect. The correction technology of the color correction circuit can achieve color balance in the early stage of the drive signal generation, reducing the subsequent color processing requirements.

[0095] The present application also provides a driving method of a reflective display device, which is used to drive the reflective display device as described above. The driving method comprises:

[0096] The data driving chip 41 inputs a data driving signal to the data signal distributor 42;

[0097] The control data signal distributor 42 distributes the corresponding data driving signal to the data lines on each reflective display panel. In this embodiment, the number of reflective display panels is three, and the three reflective display panels are the first reflective display panel 10, the second reflective display panel 20 and the third reflective display panel 30 in the direction facing the external environment. The data driving signal includes 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 line (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 line (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 line (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.

[0098] Further, the control data signal distributor 42 sequentially distributes the corresponding data driving signal to the data lines on each reflective display panel, that is, the control data signal distributor 42 can distribute the corresponding data driving signal to the data lines on each reflective display panel in time periods. For example, in a first time period, the data driver 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 driver chip 41 to the data line (first data line 102) on the first reflective display panel 10; in a second time period, the data driver 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 driver chip 41 to the data line (second data line 202) on the second reflective display panel 20; in a third time period, the data driver 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 driver chip 41 to the data line (third data line 302) on the third reflective display panel 30. By superimposing the display images 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 is displayed, which has low requirements on the data processing capabilities of the data driver chip 41 and the data signal distributor 42 .

[0099] In another embodiment, the control data signal distributor 42 distributes the corresponding data driving signals to the data lines on each reflective display panel at the same time. For example, the data driver chip 41 simultaneously inputs the first data driving signal Va, the second data driving signal Vb and the third data driving signal Vc to the data signal distributor 42, and the data signal distributor 42 distributes the first data driving signal Va input by the data driver chip 41 to the data line (first data line 102) on the first reflective display panel 10, distributes the second data driving signal Vb input by the data driver chip 41 to the data line (second data line 202) on the second reflective display panel 20, and distributes the third data driving signal Vc input by the data driver chip 41 to the data line (third data line 302) on the third reflective display panel 30 according to the control signal applied by the driver chip (data driver chip 41) or the central processor. By superimposing the display 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, but this requires a high data processing capability of the data driver chip 41 and the data signal distributor 42.

[0100] In this embodiment, each reflective display panel has a scan circuit, and the reflective display device 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 a scan drive signal to the scan signal distributor 52. The scan circuits on multiple reflective display panels are electrically connected to the same scan signal distributor 52, and the scan signal distributor 52 is used to distribute the scan drive signal to the scan circuits on the corresponding reflective display panels. The driving method also includes:

[0101] When the control data signal distributor 42 distributes the corresponding data driving signal to the data lines on each reflective display panel, the control scan signal distributor 52 distributes the corresponding scan driving signal to the scan line on the reflective display panel to which the data driving signal is distributed. 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 driving signal input by the scan driving chip 51 to the scan line (first scan line 101) on the first reflective display panel 10 according to the control signal applied by the driver chip (scan driving chip 51) or the central processing unit, and at the same time, the data signal distributor 42 distributes the first data driving signal Va input by the data driving chip 41 to the data line (first data line 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 driving signal input by the scan driving chip 51 to the scan line (first data line 102) on the second reflective display panel 20 according to the control signal applied by the driver chip (scan driving chip 51) or the central processing unit. The data signal distributor 42 distributes the second data driving signal Vb input by the data driver 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 scanning line 301) on the third reflective display panel 30 according to the control signal applied by the driving chip (scanning driving chip 51) or the central processing unit, and at the same time, the data signal distributor 42 distributes the third data driving signal Vc input by the data driver chip 41 to the data line (third data line 302) on the third reflective display panel 30.

[0102] The control scan signal distributor 52 may distribute the corresponding scan drive signal to the scan lines on each reflective display panel in sequence, that is, the control scan signal distributor 52 may distribute the corresponding scan drive signal to the scan lines on each reflective display panel in time periods. Alternatively, the control scan signal distributor 52 may also distribute the corresponding scan drive signal to the scan lines on each reflective display panel at the same time.

[0103] Since multiple reflective display panels all use the same data driver chip 41 and data signal distributor 42, the data driver signal actually transmitted to the reflective display panel will inevitably be biased, resulting in image distortion. The color correction circuit can be used to correct the data driver signal to improve the displayed image quality. Therefore, 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. The driving method also includes:

[0104] 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, and based on the transition relationship between different colors, the parameters of the mapping algorithm are adjusted, and the first difference adjustment is performed on the data driving signal corresponding to each reflective display panel through color interpolation or curve fitting.

[0105] Exemplarily, the color mapping algorithm can optimize the mapping relationship of color transitions to ensure that the transition between different colors is smooth. The color mapping algorithm maps the input data drive signal to the color space of the reflective display device and takes into account the characteristics of each reflective display panel. For example, if the color response range of a reflective display panel is narrow, the mapping algorithm can compress or expand the input data drive 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, a smoother and more accurate color transition effect can be achieved.

[0106] Exemplarily, before the data drive signal is mapped to the color space of the reflective display device, the reflective display device may be color corrected 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 color more accurate and consistent. Then, according to the color response range of each reflective display panel, a mapping algorithm is used to map the input data drive signal to the color space of the reflective display device. The mapping process can be completed by using a gamma correction algorithm, a Look-Up Table (LUT) algorithm, linear interpolation, polynomial fitting, etc.

[0107] Exemplarily, gamma correction is a common mapping algorithm used to adjust the brightness level of the input data drive signal to match the response curve of the display device. Gamma correction can improve the brightness uniformity and color accuracy of the display by nonlinearly adjusting the input data drive signal. The steps of mapping with the gamma correction algorithm include:

[0108] S11: Determine the Gamma value to be used. The Gamma value represents the nonlinear relationship between the brightness of the input data driving signal and the output brightness. Common Gamma values ​​are usually between 1.8 and 2.5, depending on the characteristics of the display device and the desired display effect.

[0109] S12: Perform nonlinear transformation on the input data driving signal to adjust its brightness level. Gamma correction uses a power function, expressed as:

[0110] [V_{\text{out}}=V_{\text{in}}^\gamma]

[0111] Among them, (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.

[0112] S13: Gamma correction is performed on the input data driving signal of each gray level to obtain a corresponding output data driving signal, so that the brightness of each gray level can be adjusted to make it more accurate and consistent when displayed on the output device.

[0113] S14: Balance the brightness to ensure that the overall display effect is uniform and smooth. When performing gamma correction, it is usually necessary to consider the issue of brightness balance. Because gamma correction is nonlinear, brightness balance can avoid some brightness level distortion.

[0114] Exemplarily, the Look-Up Table (LUT) algorithm performs mapping by mapping the input data drive signal to the output color space through a pre-established lookup table. This method can accurately correct the output of each reflective display panel to achieve the desired color performance effect. The steps of mapping using the Look-Up Table algorithm include:

[0115] S21: Create a Look-Up Table according to 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 the input data driving signal and the corresponding output data driving signal.

[0116] S22: Discretize input data. Discretize the value range of the input data driving signal, usually dividing it into several discrete values ​​or levels. These discrete values ​​will serve as inputs to the LUT table.

[0117] S23: For each discretized input data driving signal value, the corresponding output data driving signal value is calculated by a mapping algorithm, and the pair of input and output data driving signal values ​​is filled into the LUT table. This filling process can be completed by gamma correction, polynomial fitting and other methods.

[0118] S24: When a new input data driving signal is received, the system will search the LUT table for the corresponding output data driving signal value according to the input data driving signal. This search process is very fast because the LUT table can calculate all possible mapping relationships in advance.

[0119] 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 display and full utilization of colors.

[0120] For example, linear interpolation is a simple but effective mapping algorithm that maps the input data drive signal to the output color space by linearly transforming the value of the input data drive signal. Although not as accurate as gamma correction and LUT mapping, linear interpolation can improve the accuracy and smoothness of color to a certain extent. The steps of mapping with the linear interpolation algorithm include:

[0121] S31: Determine the value range of the input data driving signal, which is to ensure that the input data driving signal is properly processed to adapt to 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 driving signal is usually determined according to the specific color response range of the reflective display panel and the color space of the reflective display device.

[0122] S32: Determine the value range of the output data driving signal to ensure that it is adapted to 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 driving signal is within the correct range so as to correctly drive the reflective display panel to display the correct color and brightness.

[0123] S33: According to the value ranges of the input data driving signal and the output data driving signal, a linear mapping relationship is established to perform interpolation calculation, which usually involves determining the values ​​of two endpoints, that is, the values ​​of the output data driving signal corresponding to the minimum value and the maximum value of the input data driving signal.

[0124] 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 estimates or predicts the values ​​between these data points through a linear relationship. The linear interpolation algorithm is usually based on known data points, such as the values ​​of the endpoints, and calculates the values ​​between these data points through a linear relationship to obtain the value of the output data drive signal.

[0125] S35: According to the output data driving signal value obtained by linear interpolation calculation, it is sent as a processed signal to the corresponding reflective display panel to ensure accurate display and full utilization of colors. This step ensures that the output data driving signal after interpolation calculation is correctly applied to the reflective display panel to display the correct color and brightness, thereby realizing signal compression or expansion processing.

[0126] Exemplarily, polynomial fitting is a mapping algorithm based on a mathematical model. By fitting the mathematical function between the input data driving signal and the output color space, a method of approximating the relationship between discrete data points through polynomials is used to find the best fitting curve to minimize the difference between the predicted value and the actual data point to achieve accurate color correction and mapping. This method usually requires more complex calculations, but can provide more accurate color matching. The process of mapping with a polynomial fitting algorithm includes:

[0127] S41: Collect input and output characteristic data of the display device (reflective display apparatus), which usually include actual display brightness or color values ​​under different input data driving signal strengths.

[0128] S42: Select a suitable polynomial order. The order of the polynomial determines the complexity of the fitted curve. Generally, the higher the order, the more accurate the curve fitting.

[0129] S43: Establish a polynomial model according to the selected order. For example, a quadratic polynomial model can be expressed as:

[0130] P(x)=ax^2+bx+c

[0131] Where a, b, and c are the polynomial coefficients and x is the input data drive signal.

[0132] S44: Calculate the coefficients of the polynomial using the collected data points. This is usually achieved by the least square method, that is, finding the coefficients so that the sum of the squared errors between the fitted curve and the actual data points is minimized.

[0133] S45: Establishing a polynomial fitting curve based on the calculated coefficients. This curve describes the relationship between the input data driving signal and the output of the display device.

[0134] S46: Mapping the input data driving signal to the color space of the display device through the fitting curve. For example, if the intensity of the input data driving signal is x, the value calculated by the polynomial P(x) is the intensity that the reflective display panel should display.

[0135] S35: driving the signal value according to the calculated output data, and sending it as a processed signal to the corresponding reflective display panel to ensure accurate display and full utilization of the color. The validity of the polynomial fitting mapping can also be verified by comparing the mapped output with the expected output.

[0136] Step B: Based on the color response characteristics and color space standard of each reflective display panel, a correction curve or a lookup table is called, and a second difference adjustment is performed by dynamically adjusting the data driving signal corresponding to each reflective display panel.

[0137] Exemplarily, the color correction algorithm can ensure the color balance of each reflective display panel by real-time processing of the generated data drive signal based on the color response characteristics of the reflective display device and the standard color space. The color correction algorithm can be adjusted according to the characteristics of the panel and the differences in the manufacturing process. For example, if the response of a certain reflective display panel is uneven, the algorithm can weight or correct the corresponding data drive signal to achieve overall color balance. The core of color correction is to adjust the color during the conversion of the data drive signal according to the color response characteristics of the reflective display device and the standard color space. For the color transition problem, the color correction algorithm can ensure the smoothness and consistency of the color during the transition from one color to another. They avoid incoherent or uneven color transition effects by appropriately weighting or correcting the data drive signal in the transition area. These algorithms can dynamically adjust the data drive signal according to the specific color transition situation to ensure the natural and smooth color transition.

[0138] 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 of 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.

[0139] Exemplarily, a sensor or feedback mechanism can be used to monitor the color output of a reflective display device, and the generated data drive signal can be adjusted in real time according to the monitoring results. For color transition problems, intelligent adjustment technology can monitor the color response in the transition area and dynamically adjust the data drive signal to ensure the smoothness and continuity of the color transition. For example, by detecting the changes in color brightness and saturation in the transition area, the system can adaptively adjust the color output to eliminate discontinuities or jumps in color transitions. For example, by monitoring the ambient light level through an optical sensor, the system can adjust the data drive signal to adapt to different lighting conditions to ensure color balance. Intelligent adjustment technology can also be adaptively adjusted according to the aging degree or temperature changes of the panel.

[0140] Step D: Determine the color transition area of ​​the data driving signal, perform weighted correction on the color gradient difference of the color transition area according to the color transition requirements of different color display areas, and smoothly adjust 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.

[0141] Exemplarily, a color management system (CMS) is a software or hardware system, usually embedded in a driver chip or display controller, that can dynamically adjust the output of each reflective display panel. In the color transition problem, the color management system can improve the color transition effect by optimizing the color transition path in the color space. It can smoothly adjust the color output in the transition area according to the needs of the color transition to ensure the continuity and consistency of the color. Through the correction curve or lookup table (LUT), the CMS can achieve fine adjustment of the color transition to meet the needs and preferences of the user. Exemplarily, the color management system can dynamically adjust the output of each reflective display panel according to the user's preferences or preset color standards. It can be achieved through a correction curve or a lookup table (LUT) to ensure the color balance of each reflective display panel. The color management system can also provide a user interface to allow users to make color adjustments according to their needs.

[0142] [Example 2]

[0143] Fig.16 It is a schematic diagram of the planar structure of the reflective display device in the second embodiment of the present invention. Fig.17 FIG. 1 is a schematic diagram of a circuit structure of a scanning drive signal on a reflective display device in Embodiment 2 of the present invention. Fig.16 and Fig.17 As shown, the reflective display device and driving method provided in the second embodiment of the present invention are similar to those in the first embodiment ( Figures 1 to 15 ) are substantially the same, except that, in this embodiment:

[0144] The reflective display device includes multiple scanning driver chips 51, which are electrically connected to the reflective display panels one by one. The scanning driver chips 51 are used to directly input scanning driver signals to the scanning circuits on the corresponding reflective display panels. Each reflective display panel uses a separate scanning driver chip 51 to apply a scanning driver signal, thereby eliminating the need for a scanning signal distributor 52.

[0145] Furthermore, there are three reflective display panels, which are sequentially a first reflective display panel 10, a second reflective display panel 20, and a third reflective display panel 30 in the direction facing the external environment. There are three scan driver chips 51, which are sequentially a first scan driver chip 511, a second scan driver chip 512, and a third scan driver chip 513. Among them, the first scan driver chip 511 is arranged on the first reflective display panel 10 and is electrically connected to the scan line (first scan line 101) on the first reflective display panel 10, and the first scan driver chip 511 is used to directly input the scan drive signal to the scan line (first scan line 101) on the first reflective display panel 10; the second scan driver chip 512 is arranged on the second reflective display panel 20 and is electrically connected to the scan line (second scan line 201) on the second reflective display panel 20, and the second scan driver chip 512 is used to directly input the scan drive signal to the scan line (second scan line 201) on the second reflective display panel 20; the third scan driver chip 513 is arranged on the third reflective display panel 30 and is electrically connected to the scan line (third scan line 301) on the third reflective display panel 30, and the third scan driver chip 513 is used to directly input the scan drive signal to the scan line (third scan line 301) on the third reflective display panel 30.

[0146] It should be understood by those skilled in the art that the rest of the structure and working principle of this embodiment are the same as those of the first embodiment and will not be described in detail here.

[0147] [Example 3]

[0148] Fig.18 Schematic diagram of the structure of the reflective display device in the third embodiment of the present invention in the white state. Fig.19 Schematic diagram of the structure of the reflective display device in the black state in the third embodiment of the present invention. Fig.18 and Fig.19 As shown, the reflective display device and driving method provided in the third embodiment of the present invention are similar to those in the first embodiment ( Figures 1 to 15 )、Example 2 ( Figure 16 to Figure 17 ) are substantially the same, except that, in this embodiment:

[0149] Among the multiple reflective display panels, the reflective display panel farthest from the external environment is an electrophoretic reflective display panel, and the other reflective display panels are cholesteric liquid crystal reflective display panels. In this embodiment, the number of reflective display panels is three, and 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 in the direction toward the external environment, wherein the first reflective display panel 10 is an electrophoretic reflective display panel, the second reflective display panel 20 and the third reflective display panel 30 are cholesteric liquid crystal reflective display panels, and the structures of the second reflective display panel 20 and the third reflective display panel 30 can refer to the first embodiment.

[0150] The first reflective display panel 10 includes a first opposing substrate 11, a first array substrate 12 arranged opposite to the first opposing substrate 11, and an ink capsule 14 located between the first opposing substrate 11 and the first array substrate 12. All ink capsules 14 are provided with black ink particles 141, first color ink particles 142 and electrophoretic liquid of opposite polarity. The first color ink particles 142 are used to reflect the light of the first color, and the black ink particles 141 are used to absorb light of various colors, so that the reflective display device is darker in the black state to improve the 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, so that the first color ink particles 142 move in the direction of the electric field, and the black ink particles 141 move in the opposite direction of the electric field. If an electric field is applied in an upward direction, the first color ink particles 142 move upward and the black ink particles 141 move downward; if an electric field is applied in a downward direction, the first color ink particles 142 move downward and the black ink particles 141 move upward. Of course, the black ink particles 141 may be positively charged and the first color ink particles 142 may be negatively charged, so that the black ink particles 141 move in the direction of the electric field and the first color ink particles 142 move in the opposite direction of the electric field.

[0151] A first pixel electrode 121 is provided on the first array substrate 12, and a first common electrode 111 matched with the first pixel electrode 121 is provided on the first opposing substrate 11. The direction of the electric field between the first pixel electrode 121 and the first common electrode 111 is controlled by controlling the voltage polarity on the first pixel electrode 121, so as to control the ink capsule 14 to switch between the black state (light absorption state) and the reflection state. For example, if a 0V common voltage is applied to the first common electrode 111, if 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 directed 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 directed downward.

[0152] 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.

[0153] The black ink particles 231 are negatively charged and the first color ink particles 142 are positively charged. Fig.18 As shown, when displaying a white state picture, the first common electrode 111, the second common electrode 211 and the third common electrode 311 are all applied with a 0V common voltage, the first pixel electrode 121 is applied with a positive grayscale voltage, and the second pixel electrode 221 and the third pixel electrode 321 are not applied with a voltage. The first color ink particles 142 in the ink capsule 14 are controlled to be concentrated toward the side close to the first common electrode 111 and reflect the first color light, that is, reflect red light; the second cholesteric liquid crystal layer 23 is controlled to be in a reflective state and reflect the second color light, that is, reflect green light; the third cholesteric liquid crystal layer 33 is controlled to be in a reflective state and reflect the third color light, that is, reflect blue light, so that the reflective display device presents a white state picture. That is, the data signal distributor 42 distributes the reflective state 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 driving chip or the central processing unit.

[0154] like Fig.19As shown, when displaying a black state image, the first common electrode 111, the second common electrode 211 and the third common electrode 311 are all applied with a 0V common voltage, and a negative grayscale voltage is applied to the first pixel electrode 121. The second pixel electrode 221 and the third pixel electrode 321 are all applied with a grayscale voltage, and then the voltage is slowly reduced to 0. The black ink particles 141 in the ink capsule 14 are controlled to be concentrated toward the side close to the first common electrode 111 and be in a light absorption state; the second cholesteric liquid crystal layer 23 and the third cholesteric liquid crystal layer 33 are controlled to be in a light transmission state, and the ambient light sequentially passes 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, so that the reflective display device presents a black state image. That is, the data signal distributor 42 distributes the data driving signal in the light transmission state to the second reflective display panel 20 and the third reflective display panel 30 according to the control signal applied by the driving chip or the central processing unit, and distributes the data driving signal in the light absorption state to the first reflective display panel 10.

[0155] Among them, when it is necessary to realize a color picture, 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 reflection of the ink capsule 14, the second cholesteric liquid crystal layer 23 and the third cholesteric liquid crystal layer 33, and realize full-color picture display according to the principle of mixing the three primary colors of light.

[0156] It should be understood by those skilled in the art that the rest of the structure and working principle of this embodiment are the same as those of Embodiment 1 and Embodiment 2, and will not be described in detail here.

[0157] In this document, the directional words such as up, down, left, right, front, and back are defined by the positions of the structures in the drawings and the positions of the structures relative to each other, just for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of the directional words should not limit the scope of protection claimed in this application. It should also be understood that the terms "first" and "second" used in this document are only used to distinguish names and are not used to limit quantity and order.

[0158] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to the technical contents disclosed above without departing from the scope of the technical solution of the present invention, which are equivalent embodiments of equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the protection scope of the technical solution of the present invention.

[0159] Industrial Applicability

[0160] By having multiple reflective display panels share a data signal distributor, the data signal distributor can distribute the data driving signal input by the data driving chip to the data line on the corresponding reflective display panel, so that multiple reflective display panels can share the data driving chip to reduce the number of data driving chips and reduce the production cost.

Claims

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

2. The reflective display device according to claim 1, characterized in that: The reflective display panel farthest from the external environment among the multiple reflective display panels is a cholesteric liquid crystal reflective display panel or an electrophoretic reflective display panel, and the other reflective display panels are cholesteric liquid crystal reflective display panels.

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

4. The reflective display device according to claim 1, characterized in that: The reflective display device comprises a data signal circuit board (43), one end of the data signal circuit board (43) is electrically connected to the data signal distributor (42), and the other end of the data signal circuit board (43) is electrically connected to the data circuit 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 a plurality of data signal branch circuit boards, and the data signal branch circuit boards are electrically connected to the reflective display panels in a one-to-one correspondence; or, the number of the data signal circuit boards (43) is a plurality, and the data signal circuit boards (43) are electrically connected to the reflective display panels in a one-to-one correspondence.

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

7. The reflective display device according to claim 6, characterized in that: The reflective display device comprises a scanning signal circuit board (53), one end of the scanning signal circuit board (53) is electrically connected to the scanning signal distributor (52), and the other end of the scanning signal circuit board (53) is electrically connected to the scanning circuit 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 a plurality of scanning signal branch circuit boards, and the scanning signal branch circuit boards are connected to the reflective display panels in a one-to-one correspondence; Alternatively, there are multiple scanning signal circuit boards (53), and the scanning signal circuit boards (53) are electrically connected to the reflective display panels in a one-to-one correspondence.

9. The reflective display device according to any one of claims 1 to 5, characterized in that: Each of the reflective display panels has a scanning circuit, and the reflective display device includes: A plurality of scanning drive chips (51), the scanning drive chips (51) being electrically connected to the reflective display panels in a one-to-one correspondence, and the scanning drive chips (51) being used to directly input the scanning drive signal to the scanning circuit corresponding to the reflective display panel.

10. The reflective display device according to any one of claims 1 to 5, characterized in that: 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.

11. A method for driving a reflective display device, characterized in that: Used to drive the reflective display device according to any one of claims 1 to 10, the driving method comprising: The data driving chip (41) inputs a data driving 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 of the reflective display device according to claim 11, characterized in that: The driving method comprises: 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; Or, 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 in sequence.

13. The driving method of the reflective display device according to claim 12, characterized in that: Each of the reflective display panels has a scanning circuit, and the reflective display device comprises a scanning driving chip (51) and a scanning signal distributor (52), wherein the scanning driving 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), and the scanning circuits on a plurality of the reflective display panels are electrically connected to the same scanning signal distributor (52), and the scanning signal distributor (52) is used to distribute the scanning driving signal to the scanning circuits on the corresponding reflective display panels; The driving method comprises: When 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, the scan signal distributor (52) is simultaneously controlled to distribute the corresponding scan drive signal to the scan line on the reflective display panel to which the data drive signal is distributed.

14. The driving method of the reflective display device according to claim 12, characterized in that: Each of the reflective display panels has a scanning circuit, the reflective display device comprises a plurality of scanning drive chips (51), the scanning drive chips (51) are electrically connected to the reflective display panels in a one-to-one correspondence, and the scanning drive chips (51) are used to input the scanning drive signal to the scanning circuit on the corresponding reflective display panel; The driving method comprises: When 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, the corresponding scan drive chip (51) is simultaneously controlled to input the corresponding scan drive signal to the scan line on the reflective display panel to which the data drive signal is distributed.

15. The driving method of a reflective display device according to any one of claims 11 to 14, characterized in that: The reflective display device further comprises 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 comprises: 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, and based on the transition relationship between different colors, the parameters of the mapping algorithm are adjusted to perform a first difference adjustment on the data driving signal corresponding to each of the reflective display panels through a color interpolation method or a curve fitting method; Based on the color response characteristics and color space standard of each of the reflective display panels, calling a correction curve or a lookup table, and performing a second difference adjustment by dynamically adjusting the data drive signal corresponding to each of the reflective display panels; Acquiring an ambient light level, monitoring the color output brightness and color saturation of each of the reflective display panels, monitoring the color brightness change rate and color protection change rate of a color transition area, adjusting the data drive signal exceeding a preset change rate threshold, and performing a third difference adjustment on the data drive signal corresponding to each of the reflective display panels based on a display mode standard parameter of the reflective display device; Determine the color transition area of ​​the data driving signal, perform weighted correction on the color gradient difference of the color transition area according to the color transition requirements of different color display areas, and smoothly adjust the color transition path in the color space to perform a fourth difference adjustment on the data driving signal corresponding to each of the reflective display panels.

Images