Reflective display panel with switchable wide and narrow viewing angles and driving method

Abstract

The invention discloses a reflective display panel with switchable wide and narrow viewing angles and a driving method, the reflective display panel comprises an electronic ink screen, a cholesterol liquid crystal box and a color reflective plate which are sequentially stacked, and first pixel units of the electronic ink screen are in one-to-one correspondence with second pixel units of the cholesterol liquid crystal box; the color reflecting plate is used for reflecting the first color light; a first pixel unit of the electronic ink screen can be controlled to be in a light transmission state, a light absorption state or a light reflection state, and can reflect second color light in the light reflection state; the cholesterol liquid crystal box can be controlled to be in a reflection state or a light-transmitting state, and can reflect third-color light in the reflection state. Therefore, the reflective display panel can realize color picture display, and the electronic ink screen is of a shutter structure by controlling the first pixel units corresponding to the first strip-shaped areas to be in a light absorption state and the first pixel units corresponding to the second strip-shaped areas to be in a light transmission state or a light reflection state, so that a narrow viewing angle mode is realized, and the display effect of the electronic ink screen is improved. Therefore, wide and narrow visual angles can be switched.

Description

Technical Field

[0001] The present invention relates to the technical field of displays, and in particular to a reflective display panel with switchable wide and narrow viewing angles and a driving method. Background Art

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

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

[0004] When an existing electronic paper display needs to achieve anti-peeping display, a louver film is usually attached to the display screen to achieve a method of switching between wide and narrow viewing angles. When anti-peeping is needed, the screen can be covered with the louver film to narrow the viewing angle. However, this method requires additional louver film, which causes great inconvenience to the user. Moreover, a louver film can only achieve one viewing angle. Once the louver film is attached, the viewing angle is fixed in the narrow viewing angle mode, making it impossible to switch freely between the wide viewing angle mode and the narrow viewing angle mode. In addition, the anti-peeping film will reduce the brightness and affect the display effect. Summary of the invention

[0005] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a reflective display panel with switchable wide and narrow viewing angles and a driving method to solve the problem that electronic paper displays in the prior art cannot achieve color display and cannot achieve switchable wide and narrow viewing angles.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] The present invention provides a reflective display panel with switchable wide and narrow viewing angles, comprising an electronic ink screen, a cholesteric liquid crystal cell and a color reflector which are sequentially stacked, wherein the electronic ink screen has a plurality of first pixel units distributed in an array, the cholesteric liquid crystal cell has a plurality of second pixel units distributed in an array, the first pixel units correspond to the second pixel units one by one, and the color reflector is used to reflect a first color light;

[0008] The electronic ink screen comprises a first opposing substrate, a first array substrate arranged opposite to the first opposing substrate, and a plurality of ink capsules arranged between the first opposing substrate and the first array substrate, the ink capsules corresponding to the first pixel units one by one, each of the ink capsules containing black ink particles and second color ink particles of opposite polarities, a first common electrode arranged on the first opposing substrate, a first pixel electrode corresponding to the first pixel units one by one arranged on the first array substrate, a first side electrode and a second side electrode parallel to each other arranged between the first opposing substrate and the first array substrate, the first side electrode corresponding to the first pixel units one by one, and the ink capsules located between adjacent first side electrodes and second side electrodes;

[0009] The cholesteric liquid crystal box comprises a second opposing substrate, a second array substrate arranged opposite to the second opposing substrate, and a cholesteric liquid crystal layer located between the second opposing substrate and the second array substrate, all of the cholesteric liquid crystal layers reflect light of a third color in a reflective state, the second array substrate is provided with a second pixel electrode corresponding to the second pixel unit one by one, and the second opposing substrate is provided with a second common electrode matched with the second pixel electrode;

[0010] The reflective display panel has a first strip area and a second strip area arranged alternately. In a narrow viewing angle mode, the first pixel unit corresponding to the first strip area is controlled to be in a light absorbing state, and the first pixel unit corresponding to the second strip area is controlled to be in a light transmitting state or a light reflecting state. At this time, the electronic ink screen has a shutter structure.

[0011] Further, a plurality of first scan lines, a plurality of first data lines and a plurality of first thin film transistors are provided on the first array substrate, the plurality of first scan lines and the plurality of first data lines are mutually cross-insulated and defined to form a plurality of first pixel units, and the first pixel electrode is conductively connected to the first scan line and the first data line adjacent to the first thin film transistor through the first thin film transistor;

[0012] The second array substrate is provided with a plurality of second scanning lines, a plurality of second data lines and a plurality of second thin film transistors. The plurality of second scanning lines and the plurality of second data lines are cross-insulated and mutually arranged to define a plurality of second pixel units. The second pixel electrode is conductively connected to the second scanning lines and the second data lines adjacent to the second thin film transistors through the second thin film transistors.

[0013] Furthermore, a plurality of third thin film transistors are further provided on the first array substrate, and the first side electrode is conductively connected to the first scanning line and the first data line adjacent to the third thin film transistors through the third thin film transistors;

[0014] Any of the first pixel electrodes and the first side electrodes are respectively connected to two different first scan lines and / or two different first data lines.

[0015] Furthermore, a plurality of third scan lines, a plurality of third data lines and a plurality of third thin film transistors are provided on the first opposing substrate, the plurality of third scan lines and the plurality of third data lines are cross-insulated and mutually arranged to define a plurality of first pixel units, and the first side electrode is conductively connected to the third scan lines and the third data lines adjacent to the third thin film transistors through the third thin film transistors.

[0016] Furthermore, the first common electrode is a planar electrode that entirely covers the first opposing substrate or a block electrode that corresponds one-to-one to the first pixel units;

[0017] The second common electrode is a planar electrode that entirely covers the second opposing substrate or a block electrode that corresponds one-to-one to the second pixel units.

[0018] Furthermore, the second side electrodes are strip electrodes, and each of the second side electrodes corresponds to a column / row of the first pixel units.

[0019] Furthermore, the first opposing substrate and / or the first array substrate is provided with a side electrode signal line, and all the second side electrodes are electrically connected to the side electrode signal line;

[0020] Alternatively, all of the second side electrodes are electrically connected to the first common electrode.

[0021] Further, the second color is white, and the first color and the third color are monochromatic colors of different colors;

[0022] Alternatively, the first color, the second color, and the third color are each one of red, green, and blue.

[0023] The present application also provides a driving method of a reflective display panel, which is used to drive the reflective display panel with switchable wide and narrow viewing angles as described above, and the driving method includes:

[0024] In the wide viewing angle mode, the first pixel units in the electronic ink screen are controlled to be in a corresponding light-transmitting state, a light-absorbing state, and a light-reflecting state;

[0025] In the narrow viewing angle mode, the first pixel unit corresponding to the first strip area is controlled to be in a light absorbing state, and the first pixel unit corresponding to the second strip area is controlled to be in a light transmitting state or a light reflecting state. The first strip areas and the second strip areas are arranged alternately with each other. At this time, the electronic ink screen has a shutter structure.

[0026] Furthermore, the driving method includes:

[0027] When the sub-pixel of the reflective display panel displays a first color, the corresponding first pixel unit and the second pixel unit are controlled to be in a light-transmitting state, and the color reflector reflects the first color light;

[0028] When the sub-pixel of the reflective display panel displays a second color, the corresponding first pixel unit is controlled to be in a reflective state and reflect the second color light, and the corresponding second pixel unit is controlled to be in a reflective state or a translucent state;

[0029] When the sub-pixel of the reflective display panel displays a third color, the corresponding first pixel unit is controlled to be in a light-transmitting state, and the corresponding second pixel unit is controlled to be in a reflective state and reflect light of the third color;

[0030] When the sub-pixel of the reflective display panel displays black, the corresponding first pixel unit is controlled to be in a light-absorbing state, and the corresponding second pixel unit is controlled to be in a reflective state or a light-transmitting state.

[0031] The beneficial effects of the present invention are as follows: by adopting an electronic ink screen, a cholesterol liquid crystal cell and a color reflector which are stacked in sequence, the first pixel unit of the electronic ink screen corresponds to the second pixel unit of the cholesterol liquid crystal cell one by one; the color reflector is used to reflect the first color light; the first pixel unit of the electronic ink screen can be controlled to be a light-transmitting state, a light-absorbing state or a light-reflecting state, and can reflect the second color light in the light-reflecting state; the cholesterol liquid crystal cell can be controlled to be a reflective state or a light-transmitting state, and can reflect the third color light in the light-reflecting state. Thus, the reflective display panel can realize color picture display, and by controlling the first pixel unit corresponding to the first strip area to be a light-absorbing state, and controlling the first pixel unit corresponding to the second strip area to be a light-transmitting state or a light-reflecting state, the electronic ink screen is in a shutter structure to realize a narrow viewing angle mode, and by controlling the first pixel unit of the first strip area and the second strip area to switch between the light-absorbing state, the light-transmitting state and the light-reflecting state, the wide and narrow viewing angles can be switched. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 1 is a schematic diagram of the structure of the reflective display panel with switchable wide and narrow viewing angles in the initial state in the first embodiment of the present invention.

[0033] Figure 2 It is a schematic diagram of the planar structure of the first array substrate in the first embodiment of the present invention.

[0034] Figure 3 It is a schematic diagram of the planar structure of the first side electrode and the second side electrode in the first embodiment of the present invention.

[0035] Figure 4 It is a schematic diagram of the planar structure of the second array substrate in the first embodiment of the present invention.

[0036] Figure 5 It is a schematic diagram of the principle of the three-state transformation of cholesterol liquid crystal in Example 1 of the present invention.

[0037] Figure 6 It is a schematic diagram of the driving signal for the three-state transformation of the cholesterol liquid crystal in the first embodiment of the present invention.

[0038] Figure 7 It is a simulation diagram of the reflectivity spectrum of the red cholesterol liquid crystal in the reflection state with a white substrate and a black substrate in the first embodiment of the present invention.

[0039] Figure 8 This is a color gamut simulation diagram of the red cholesterol liquid crystal in the reflection state with a white substrate and a black substrate in the first embodiment of the present invention.

[0040] Fig. 9 This is one of the structural schematic diagrams of the reflective display panel with switchable wide and narrow viewing angles during color display in the first embodiment of the present invention.

[0041] Fig.10 This is the second structural schematic diagram of the reflective display panel with switchable wide and narrow viewing angles during color display in the first embodiment of the present invention.

[0042] Fig.11 This is one of the structural schematic diagrams of the reflective display panel with switchable wide and narrow viewing angles in the narrow viewing angle mode in the first embodiment of the present invention.

[0043] Fig.12 This is the second structural schematic diagram of the reflective display panel with switchable wide and narrow viewing angles in the narrow viewing angle mode in the first embodiment of the present invention.

[0044] Fig.13 It is a schematic diagram of the cross-sectional structure of the electronic ink screen in the narrow viewing angle mode in the first embodiment of the present invention.

[0045] Fig.14 It is a schematic diagram of the planar structure of the electronic ink screen in the narrow viewing angle mode in the first embodiment of the present invention.

[0046] Fig.15 1 is a schematic diagram of the structure of the reflective display panel with switchable wide and narrow viewing angles in the initial state in the second embodiment of the present invention.

[0047] Fig.16 It is a schematic diagram of the planar structure of the first array substrate in the second embodiment of the present invention.

[0048] Fig.17 It is a schematic diagram of the planar structure of the first opposing substrate in the second embodiment of the present invention.

[0049] Fig.18 This is one of the structural schematic diagrams of the reflective display panel with switchable wide and narrow viewing angles during color display in the third embodiment of the present invention.

[0050] Fig.19 This is the second structural schematic diagram of the reflective display panel with switchable wide and narrow viewing angles during color display in the third embodiment of the present invention.

[0051] Fig. 20 This is the third structural schematic diagram of the reflective display panel with switchable wide and narrow viewing angles during color display in the third embodiment of the present invention.

[0052] Fig.21 This is the fourth structural schematic diagram of the reflective display panel with switchable wide and narrow viewing angles during color display in the third embodiment of the present invention.

[0053] Fig. 22 This is the fifth structural schematic diagram of the reflective display panel with switchable wide and narrow viewing angles during color display in the third embodiment of the present invention.

[0054] Fig.23This is the sixth structural schematic diagram of the reflective display panel with switchable wide and narrow viewing angles during color display in the third embodiment of the present invention.

[0055] Fig.24 It is one of the planar structural schematic diagrams of the display device in the present invention.

[0056] Fig.25 This is the second schematic diagram of the planar structure of the display device in the present invention. DETAILED DESCRIPTION

[0057] 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 panel with switchable wide and narrow viewing angles and the driving method proposed by the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments:

[0058] [Example 1]

[0059] Figure 1 1 is a schematic diagram of the structure of the reflective display panel with switchable wide and narrow viewing angles in the initial state in the first embodiment of the present invention. Figure 2 It is a schematic diagram of the planar structure of the first array substrate in the first embodiment of the present invention. Figure 3 It is a schematic diagram of the planar structure of the first side electrode and the second side electrode in the first embodiment of the present invention. Figure 4 It is a schematic diagram of the planar structure of the second array substrate in the first embodiment of the present invention.

[0060] like Figures 1 to 4 As shown, a reflective display panel with switchable wide and narrow viewing angles provided in Embodiment 1 of the present invention comprises an electronic ink screen 10, a cholesterol liquid crystal cell 20 and a color reflector 30 which are stacked in sequence, the electronic ink screen 10 is arranged on the side of the reflective display panel close to the external environment, the color reflector 30 is arranged on the side of the reflective display panel away from the external environment, and the cholesterol liquid crystal cell 20 is arranged between the electronic ink screen 10 and the color reflector 30. Among them, the electronic ink screen 10 has a plurality of first pixel units P1 distributed in an array, the cholesterol liquid crystal cell 20 has a plurality of second pixel units P2 distributed in an array, the first pixel units P1 correspond to the second pixel units P2 one by one, and the color reflector 30 is used to reflect the first color light.

[0061] The electronic ink screen 10 includes a first opposing substrate 11, a first array substrate 12 arranged opposite to the first opposing substrate 11, and a plurality of ink capsules 13 arranged between the first opposing substrate 11 and the first array substrate 12, wherein the ink capsules 13 correspond to the first pixel units P1 one by one. Each ink capsule 13 is provided with black ink particles 131 and second color ink particles 132 of opposite polarity. By providing electric fields in different directions to the ink capsules 13, the black ink particles 131 and the second color ink particles 132 can move in corresponding directions. For example, the black ink particles 131 are negatively charged and the second color ink particles 132 are positively charged, so that the second color ink particles 132 move in the direction of the electric field and the black ink particles 131 move in the opposite direction of the electric field. If an electric field is provided in the upward direction, the second color ink particles 132 move in the upward direction and the black ink particles 131 move in the downward direction; if an electric field is provided in the downward direction, the second color ink particles 132 move in the downward direction and the black ink particles 131 move in the upward direction. Of course, the black ink particles 131 may be positively charged and the second color ink particles 132 may be negatively charged, so that the black ink particles 131 move in the direction of the electric field and the second color ink particles 132 move in the opposite direction of the electric field.

[0062] A first common electrode 111 is provided on the first opposing substrate 11, and a first pixel electrode 121 corresponding to the first pixel unit P1 is provided on the first array substrate 12. By controlling the voltage polarity on the first pixel electrode 121, the direction of the electric field between the first pixel electrode 121 and the first common electrode 111 is controlled, so as to control the ink capsule 13 to switch between the black state (light absorption state) and the reflection of the second color (reflection state). For example, 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 oriented 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 oriented downward. The first common electrode 111 may be a planar electrode covering the entire surface of the first opposing substrate 11; the first common electrode 111 may also be a block electrode corresponding to the first pixel unit P1, and then a plurality of block electrodes are connected together through wires and a common voltage is applied together.

[0063] A first side electrode 141 and a second side electrode 142 are provided between the first opposing substrate 11 and the first array substrate 12, and the first side electrodes 141 correspond to the first pixel units P1 one by one. The ink capsule 13 is located between the adjacent first side electrodes 141 and the second side electrodes 142. The direction of the electric field between the first side electrodes 141 and the second side electrodes 142 is controlled by the voltage polarity on the first side electrodes 141 and the second side electrodes 142, so that the ink capsule 13 is in a light-transmitting state. The first side electrode 141 and the second side electrode 142 are provided on the inner side surface of each first pixel unit P1; or, the first side electrode 141 is provided on the inner side surface of each first pixel unit P1, and one second side electrode 142 is shared between two adjacent first pixel units P1, so that the first side electrode 141 and the second side electrode 142 can control each first pixel unit P1 to be in a light-transmitting state. If a negative voltage is applied to the first side electrode 141 and a 0V common voltage is applied to the second side electrode 142, the direction of the electric field between the first side electrode 141 and the second side electrode 142 is from the second side electrode 142 to the first side electrode 141; if a positive voltage is applied to the first side electrode 141 and a 0V common voltage is applied to the second side electrode 142, the direction of the electric field between the first side electrode 141 and the second side electrode 142 is from the first side electrode 141 to the second side electrode 142. Therefore, by matching the first pixel electrode 121 and the first common electrode 111 with the first side electrode 141 and the second side electrode 142, each first pixel unit P1 can be controlled to realize a light-transmitting state, a light-absorbing state or a light-reflecting state.

[0064] The first opposing substrate 11 and the first array substrate 12 are provided with an insulating layer on the side facing the ink capsule 13 to cover the first common electrode 111 and the first pixel electrode 121 to avoid short circuit between the first side electrode 141 and the second side electrode 142 .

[0065] like Figure 2As shown, a plurality of first scan lines 101, a plurality of first data lines 102 and a plurality of first thin film transistors 103 are provided on the first array substrate 12. The plurality of first scan lines 101 and the plurality of first data lines 102 are mutually cross-insulated and defined to form a plurality of first pixel units P1. A first pixel electrode 121 and a first thin film transistor 103 are provided in each first pixel unit P1. The first pixel electrode 121 is conductively connected to the first scan line 101 and the first data line 102 adjacent to the first thin film transistor 103 through the first thin film transistor 103. The first thin film transistor 103 includes a first gate, a first active layer, a first drain and a first source. The first gate and the first scan line 101 are located in the same layer and are electrically connected. The first gate and the first active layer are separated by an insulating layer. The first source is electrically connected to the first data line 102. The first drain is electrically connected to the first pixel electrode 121 through a contact hole.

[0066] In this embodiment, a plurality of third thin film transistors 104 are further provided on the first array substrate 12, and the first side electrode 141 is conductively connected to the first scan line 101 and the first data line 102 adjacent to the third thin film transistor 104 through the third thin film transistor 104. Wherein, any first pixel electrode 121 and the first side electrode 141 are respectively connected to two different first scan lines 101 and / or two different first data lines 102, so as to ensure that each first pixel electrode 121 and each first side electrode 141 can be controlled separately. For example, any first pixel electrode 121 and the first side electrode 141 can be connected to the same first scan line 101 and to two different first data lines 102; or, any first pixel electrode 121 and the first side electrode 141 can be connected to two different first scan lines 101 and to the same first data line 102; or, any first pixel electrode 121 and the first side electrode 141 are respectively connected to two different first scan lines 101 and to two different first data lines 102. Among them, the third thin film transistor 104 includes a third gate, a third active layer, a third drain and a third source. The third gate and the first scan line 101 are located in the same third layer and are electrically connected. The third gate and the third active layer are separated by an insulating layer. The third source is electrically connected to the first data line 102, and the third drain is electrically connected to the first side electrode 141 through a contact hole.

[0067] Further, such as Figure 3As shown, the second side electrode 142 is a strip electrode, each second side electrode 142 corresponds to a column of first pixel units P1, that is, a column of first pixel units P1 shares a second side electrode 142, and the first side electrode 141 and the second side electrode 142 both extend along the direction of the first data line 102. Optionally, the first data line 102, the first side electrode 141 and the second side electrode 142 are all located between two columns of first pixel units P1, thereby reducing the impact on the aperture ratio. Of course, in other embodiments, each second side electrode 142 corresponds to a row of first pixel units P1, that is, a row of first pixel units P1 shares a row of second side electrodes 142, and the first side electrode 141 and the second side electrode 142 both extend along the direction of the first scan line 101.

[0068] Furthermore, the first array substrate 12 is provided with a side electrode signal line 143, and all the second side electrodes 142 are electrically connected to the side electrode signal line 143, so that a common voltage can be applied to all the second side electrodes 142 through the side electrode signal line 143. In other embodiments, the first opposing substrate 11 may be provided with a side electrode signal line 143, and all the second side electrodes 142 are electrically connected to the side electrode signal line 143; or, the first opposing substrate 11 and the first array substrate 12 may be provided with a side electrode signal line 143, and all the second side electrodes 142 are electrically connected to the side electrode signal line 143. Alternatively, all the second side electrodes 142 are electrically connected to the first common electrode 111, so that the same common voltage is applied to the second side electrodes 142 and the first common electrode 111.

[0069] The reflective display panel has a first strip region A1 and a second strip region A2 that are alternately arranged. The first strip region A1 and the second strip region A2 are both strip-shaped and parallel to the second side electrode 142. The first strip region A1 and the second strip region A2 each correspond to at least one column / row of first pixel units. The widths of the first strip region A1 and the second strip region A2 can be set according to the actual required anti-peeping angle, thereby determining how many columns / rows of first pixel units they correspond to. For example, Fig.13 is a schematic diagram of the cross-sectional structure of the electronic ink screen in the narrow viewing angle mode in the first embodiment of the present invention, Fig.13As shown, the thickness of the electronic ink screen 10 is 200um, the width L of the second strip area A2 is 115.47um, and the ratio of the width L of the second strip area A2 to the width W of the first strip area A1 is 0.6, that is, L / W=0.6, then the anti-peeping angle θ=2*arctan(H / L)=60°, H is the thickness of the electronic ink screen 10, and 30° in the left and right directions. In the narrow viewing angle mode, the first pixel unit P1 corresponding to the first strip area A1 is controlled to be in the light-absorbing state, and the first pixel unit P1 corresponding to the second strip area A2 is controlled to be in the light-transmitting state or the light-reflecting state. At this time, the electronic ink screen 10 is in a shutter structure, thereby achieving an anti-peeping effect.

[0070] The cholesterol liquid crystal cell 20 includes a second opposing substrate 21, a second array substrate 22 arranged opposite to the second opposing substrate 21, and a cholesterol liquid crystal layer 23 located between the second opposing substrate 21 and the second array substrate 22, and all the cholesterol liquid crystal layers 23 reflect light of the third color in the reflection state. The second opposing substrate 21 is located on the side of the cholesterol liquid crystal cell 20 close to the electronic ink screen 10, and the second opposing substrate 21 is located on the side of the cholesterol liquid crystal cell 20 close to the color reflector 30. A second pixel electrode 221 corresponding to the second pixel unit P2 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. The second pixel electrode 221 is a block electrode corresponding to the second pixel unit P2, and the second common electrode 211 is a planar electrode covering the entire surface of the second opposing substrate 21. Of course, the second common electrode 211 can also be a block electrode corresponding to the second pixel unit P2, and then a plurality of block electrodes are connected together through wires and a common voltage is applied together.

[0071] Among them, the cholesterol liquid crystal in the cholesterol liquid crystal layer 23 has three stable textures: P state (Planar, planar texture state, reflection state), FC state (Focal Conic, focal conic state, fog state) and H state (transparent state). In the P state, the reflection spectrum of the cholesterol liquid crystal is in the visible spectrum, and the cholesterol liquid crystal reflects bright colored light. The specific reflected color can be set according to the pitch of the cholesterol liquid crystal; in the FC state, the cholesterol liquid crystal no longer reflects the above colored light, and the light can be scattered through the cholesterol liquid crystal; in the H state, the cholesterol liquid crystal no longer reflects the above colored light, and the light can directly pass through the cholesterol liquid crystal, and it has no scattering effect on the light. Under the action of a certain electric field, these three states can be converted to each other.

[0072] Figure 5 Schematic diagram of the principle of the three-state transformation of cholesterol liquid crystal in the first embodiment of the present invention. Figure 6 Schematic diagram of the driving signal for the three-state transformation of cholesterol liquid crystal in the first embodiment of the present invention. Figure 5 and Figure 6As shown, a common voltage signal Vcom is applied to the second common electrode 211, and a first electric signal V1 is continuously applied to the second pixel electrode 221, a voltage difference (for example, 16V) is formed between the common voltage signal Vcom and the first electric signal V1, a strong vertical electric field is formed between the second common electrode 211 and the second pixel electrode 221, and the cholesterol liquid crystal in the cholesterol liquid crystal layer 23 rotates and stagnates in the H state (transparent state); a common voltage signal Vcom is applied to the second common electrode 211, and a second electric signal V2 is applied to the second pixel electrode 221, a voltage difference (for example, 16V) is formed between the second electric signal V2 and the common voltage signal Vcom, and the second electric signal V2 gradually becomes the same as the common voltage signal Vcom within a first preset time, that is, the second electric signal V2 first has a large voltage difference with the common voltage signal Vcom, and then slowly decreases and becomes the same as the common voltage signal Vcom. Therefore, a strong vertical electric field is first formed between the second common electrode 211 and the second pixel electrode 221, and then the vertical electric field disappears slowly, so that the cholesterol liquid crystal in the cholesterol liquid crystal layer 23 rotates and stops in the FC state, which is a scattering state and has a light-scattering effect; a common voltage signal Vcom is applied to the second common electrode 211, and a third electric signal V3 is applied to the second pixel electrode 221. 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 second common electrode 211 and the second pixel electrode 221, and then the vertical electric field disappears quickly, so that the cholesterol liquid crystal in the cholesterol liquid crystal layer 23 rotates and stops in the P state, which is a reflection state. Among them, the arrangement direction of the cholesterol liquid crystal is different, the reflected visible light spectrum is different, and the remaining spectrum is transmitted. The reflection spectrum band (Δλ) of cholesterol liquid crystal is proportional to the helical pitch (Po) and birefringence (Δn=ne-no) of cholesterol liquid crystal, and the formula is: Δλ=PoΔn. Therefore, cholesterol liquid crystals with different helical pitches can reflect light of different colors in the reflection state. The P state and FC state do not require voltage to maintain.

[0073] A plurality of second scan lines 201, a plurality of second data lines 202 and a plurality of second thin film transistors 203 are provided on the second array substrate 22. The plurality of second scan lines 201 and the plurality of second data lines 202 are mutually cross-insulated and defined to form a plurality of second pixel units P2. A second pixel electrode 221 and a second thin film transistor 203 are provided in each second pixel unit P2. The second pixel electrode 221 is conductively connected to the second scan line 201 and the second data line 202 adjacent to the second thin film transistor 203 through the second thin film transistor 203. The second thin film transistor 203 includes a second gate, a second active layer, a second drain and a second source. The second gate and the second scan line 201 are located in the same second layer and are electrically connected. The second gate and the second active layer are separated by an insulating layer. The second source is electrically connected to the second data line 202. The second drain is electrically connected to the second pixel electrode 221 through a contact hole.

[0074] Optionally, the projections of the first scan line 101 and the second scan line 201 on the second array substrate 22 overlap with each other, the projections of the first data line 102 and the second data line 202 on the second array substrate 22 overlap with each other, the projections of the first thin film transistor 103 and the second thin film transistor 203 on the second array substrate 22 overlap with each other, and the projections of the first pixel electrode 121 and the second pixel electrode 221 on the second array substrate 22 overlap with each other.

[0075] The first opposing substrate 11, the first array substrate 12, the second opposing substrate 21 and the second array substrate 22 may be made of transparent substrates such as glass, acrylic and polycarbonate. The materials of the first common electrode 111, the first pixel electrode 121, the second common electrode 211, the second pixel electrode 221, the first side electrode 141 and the second side electrode 142 may be made of transparent electrodes such as indium tin oxide (ITO) or indium zinc oxide (IZO). The materials of the first side electrode 141 and the second side electrode 142 are transparent electrodes, which can avoid the influence of the electronic ink screen 10 on the wide viewing angle effect. Of course, the materials of the first side electrode 141 and the second side electrode 142 can also be made of opaque metal materials, so as to increase the anti-peeping effect of the electronic ink screen 10 at a narrow viewing angle.

[0076] Furthermore, the color reflector 30 may be formed by coating a layer of color ink on the reflector, so that the reflector only reflects light of a color corresponding to the color ink.

[0077] In this embodiment, the second color is white, and the first color and the third color are single colors of different colors, and the first color and the third color can be one of red, green and blue. For example, the first color is blue and the third color is red, that is, the color reflector 30 is a blue reflector and reflects blue light, the second color ink particles 132 are white ink particles and reflect white light, and the cholesterol liquid crystal layer 23 reflects red light in the reflective state; or, the first color is blue and the third color is green, that is, the color reflector 30 is a blue reflector and reflects blue light, and the cholesterol liquid crystal layer 23 reflects green light in the reflective state; or, the first color is red and the third color is green, that is, the color reflector 30 is a red reflector and reflects red light, and the cholesterol liquid crystal layer 23 reflects green light in the reflective state. In the reflective state, green light is reflected; or, the first color is red and the third color is blue, that is, the color reflector 30 is a red reflector and reflects red light, and the cholesterol liquid crystal layer 23 reflects blue light in the reflective state; or, the first color is green and the third color is red, that is, the color reflector 30 is a green reflector and reflects green light, and the cholesterol liquid crystal layer 23 reflects red light in the reflective state; or, the first color is green and the third color is blue, that is, the color reflector 30 is a green reflector and reflects green light, and the cholesterol liquid crystal layer 23 reflects blue light in the reflective state.

[0078]

[0079] Figure 7 It is a simulation diagram of the reflectivity spectrum of the red cholesterol liquid crystal in the reflection state with a white substrate and a black substrate in the first embodiment of the present invention. Figure 8 This is a color gamut simulation diagram of the red cholesterol liquid crystal in the reflection state with a white substrate and a black substrate in the first embodiment of the present invention. Figure 7 and Figure 8 As shown, the reflectivity ratio of the red cholesterol liquid crystal in the P state (reflective state) with the white substrate and the black substrate at wavelengths of 530nm, 680nm, and 450nm is 1:0.4:0.18.

[0080] The present application also provides a method for driving a reflective display panel, which is used to drive the reflective display panel with switchable wide and narrow viewing angles as described above. The driving method comprises:

[0081] Fig. 9 This is one of the structural schematic diagrams of the reflective display panel with switchable wide and narrow viewing angles during color display in the first embodiment of the present invention. Fig.10 FIG2 is a second structural diagram of a reflective display panel with switchable wide and narrow viewing angles in color display in the first embodiment of the present invention. Fig. 9 and Fig.10As shown, in the wide viewing angle mode, the first pixel units P1 in the electronic ink screen 10 are controlled to be in the corresponding light-transmitting state, light-absorbing state and light-reflecting state.

[0082] Specifically, when the sub-pixel of the reflective display panel displays the first color (blue), the corresponding first pixel unit P1 and the second pixel unit P2 are controlled to be in a light-transmitting state, the ink capsule 13 in the first pixel unit P1 is controlled to be in a light-transmitting state through the first side electrode 141 and the second side electrode 142, and the cholesterol liquid crystal layer 23 in the second pixel unit P2 is controlled to be in a fogging state ( Fig. 9 ) or transparent state ( Fig.10 ), the ambient light passes through the electronic ink screen 10 and the cholesterol liquid crystal box 20, and the color reflector 30 reflects the first color light (blue light Lb).

[0083] When the sub-pixel of the reflective display panel displays the second color (white), the corresponding first pixel unit P1 is controlled to be in a reflective state and reflect the second color light (white light), and the corresponding second pixel unit P2 is controlled to be in a reflective state or a light-transmitting state. The ink capsule 13 in the first pixel unit P1 is controlled to be in a reflective state through the first pixel electrode 121 and the first common electrode 111, so that the second color ink particles 132 are close to the external environment and reflect the second color light (white light Lw); the cholesterol liquid crystal layer 23 in the second pixel unit P2 is controlled to be in a reflective state or a light-transmitting state (fog state or transparent state) through the second common electrode 211 and the second pixel electrode 221. Since light cannot pass through the ink capsule 13, the cholesterol liquid crystal layer 23 in the second pixel unit P2 can be in a reflective state, a foggy state or a transparent state.

[0084] When the sub-pixel of the reflective display panel displays the third color (red), the corresponding first pixel unit P1 is controlled to be in a light-transmitting state, and the corresponding second pixel unit P2 is controlled to be in a reflective state and reflect the third color light. The ink capsule 13 in the first pixel unit P1 is controlled to be in a light-transmitting state through the first side electrode 141 and the second side electrode 142; the cholesterol liquid crystal layer 23 in the second pixel unit P2 is controlled to be in a reflective state and reflect the third color light (red light Lr) through the second common electrode 211 and the second pixel electrode 221.

[0085] When the sub-pixel of the reflective display panel displays black, the corresponding first pixel unit P1 is controlled to be in a light-absorbing state, and the corresponding second pixel unit P2 is controlled to be in a reflective state or a light-transmitting state. The ink capsule 13 in the first pixel unit P1 is controlled to be in a light-absorbing state through the first pixel electrode 121 and the first common electrode 111, so that the black ink particles 131 are close to the external environment and reflect and absorb light, showing black; the cholesterol liquid crystal layer 23 in the second pixel unit P2 is controlled to be in a reflective state or a light-transmitting state (fog state or transparent state) through the second common electrode 211 and the second pixel electrode 221. Since light cannot pass through the ink capsule 13, the cholesterol liquid crystal layer 23 in the second pixel unit P2 can be in a reflective state, a foggy state or a transparent state.

[0086] Fig.11 This is one of the structural schematic diagrams of the reflective display panel with switchable wide and narrow viewing angles in the narrow viewing angle mode in the first embodiment of the present invention. Fig.12 This is the second structural schematic diagram of the reflective display panel with switchable wide and narrow viewing angles in the narrow viewing angle mode in the first embodiment of the present invention. Fig.13 It is a schematic diagram of the cross-sectional structure of the electronic ink screen in the narrow viewing angle mode in the first embodiment of the present invention. Fig.14 Schematic diagram of the planar structure of the electronic ink screen in the narrow viewing angle mode in the first embodiment of the present invention. Figures 11 to 14 As shown, in the narrow viewing angle mode, the first pixel unit P1 corresponding to the first strip area A1 is controlled to be in a light absorbing state, and the first pixel unit P1 corresponding to the second strip area A2 is controlled to be in a light transmitting state or a light reflecting state. The first strip area A1 and the second strip area A2 are arranged alternately with each other. At this time, the electronic ink screen 10 presents a shutter structure.

[0087] Among them, in the narrow viewing angle mode, the second pixel unit P2 corresponding to the first strip area A1 is controlled to be in a reflective state or a light-transmitting state, and the cholesterol liquid crystal layer 23 in the second pixel unit P2 is controlled to be in a reflective state or a light-transmitting state (fog state or transparent state) through the second common electrode 211 and the second pixel electrode 221. Since light cannot pass through the ink capsule 13, the cholesterol liquid crystal layer 23 in the second pixel unit P2 can be in a reflective state, a fog state or a transparent state. In this embodiment, in the narrow viewing angle mode, the first pixel unit P1 corresponding to the second strip area A2 is controlled to be in a light-transmitting state, and the ink capsule 13 in the first pixel unit P1 is controlled to be in a light-transmitting state through the first side electrode 141 and the second side electrode 142; and the second pixel unit P2 in the area corresponding to the second strip area A2 is used to display red and blue. Of course, the first pixel unit P1 corresponding to the second strip area A2 can also be controlled to be in a light-transmitting state, a light-absorbing state or a reflective state, so that the sub-pixel of the reflective display panel in the second strip area A2 can display black, white, red and blue, but the anti-peeping effect is slightly worse.

[0088] [Example 2]

[0089] Fig.15 1 is a schematic diagram of the structure of the reflective display panel with switchable wide and narrow viewing angles in the initial state in the second embodiment of the present invention. Fig.16 It is a schematic diagram of the planar structure of the first array substrate in the second embodiment of the present invention. Fig.17 FIG. 1 is a schematic diagram of the planar structure of the first opposing substrate in the second embodiment of the present invention. Figures 15 to 17 As shown, the reflective display panel with switchable wide and narrow viewing angles provided in the second embodiment of the present invention is different from the reflective display panel in the first embodiment ( Figures 1 to 14 ) are substantially the same as the reflective display panel with switchable wide and narrow viewing angles, except that, in this embodiment:

[0090] The first common electrode 111 may be a planar electrode that covers the entire surface of the first counter substrate 11 , thereby reducing one mask process.

[0091] In this embodiment, Fig.16 As shown, a plurality of first scan lines 101, a plurality of first data lines 102 and a plurality of first thin film transistors 103 are provided on the first array substrate 12. The plurality of first scan lines 101 and the plurality of first data lines 102 are mutually cross-insulated and defined to form a plurality of first pixel units P1. A first pixel electrode 121 and a first thin film transistor 103 are provided in each first pixel unit P1. The first pixel electrode 121 is conductively connected to the first scan line 101 and the first data line 102 adjacent to the first thin film transistor 103 through the first thin film transistor 103. The first thin film transistor 103 includes a first gate, a first active layer, a first drain and a first source. The first gate and the first scan line 101 are located in the same layer and are electrically connected. The first gate and the first active layer are separated by an insulating layer. The first source is electrically connected to the first data line 102. The first drain is electrically connected to the first pixel electrode 121 through a contact hole.

[0092] like Fig.17 As shown, a plurality of third scan lines 105, a plurality of third data lines 106 and a plurality of third thin film transistors 104 are provided on the first counter substrate 11, the plurality of third scan lines 105 and the plurality of third data lines 106 are mutually cross-insulated and defined to form a plurality of first pixel units P1, and the first side electrode 141 is conductively connected to the third scan line 105 and the third data line 106 adjacent to the third thin film transistor 104 through the third thin film transistor 104. The third thin film transistor 104 includes a third gate, a third active layer, a third drain and a third source, the third gate and the third scan line 105 are located in the same three layers and are electrically connected, the third gate and the third active layer are separated by an insulating layer, the third source is electrically connected to the third data line 106, and the third drain is electrically connected to the first side electrode 141 through a contact hole.

[0093] Optionally, the projections of the first scan line 101 and the third scan line 105 on the first array substrate 12 overlap with each other, the projections of the first data line 102 and the third data line 106 on the first array substrate 12 overlap with each other, and the projections of the first thin film transistor 103 and the third thin film transistor 104 on the first array substrate 12 overlap with each other.

[0094] 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.

[0095] [Example 3]

[0096] Fig.18 This is one of the structural schematic diagrams of the reflective display panel with switchable wide and narrow viewing angles during color display in the third embodiment of the present invention. Fig.19 This is the second structural schematic diagram of the reflective display panel with switchable wide and narrow viewing angles during color display in the third embodiment of the present invention. Fig. 20 This is the third structural schematic diagram of the reflective display panel with switchable wide and narrow viewing angles during color display in the third embodiment of the present invention. Fig.21 This is the fourth structural schematic diagram of the reflective display panel with switchable wide and narrow viewing angles during color display in the third embodiment of the present invention. Fig. 22 This is the fifth structural schematic diagram of the reflective display panel with switchable wide and narrow viewing angles during color display in the third embodiment of the present invention. Fig.23 This is the sixth structural schematic diagram of the reflective display panel with switchable wide and narrow viewing angles in the third embodiment of the present invention during color display. Figures 18 to 23 As shown, the reflective display panel with switchable wide and narrow viewing angles provided in the third embodiment of the present invention is different from the reflective display panel in the first embodiment ( Figures 1 to 14 )、Example 2 ( Figures 15 to 17 ) are substantially the same as the reflective display panel with switchable wide and narrow viewing angles, except that, in this embodiment:

[0097] The first color, the second color, and the third color are each one of red, green, and blue, so that a full-color picture display can be achieved. Fig.18 As shown, the first color is blue, the second color is green, and the third color is red, that is, the color reflector 30 is a blue reflector and reflects blue light, the second color ink particles 132 are green ink particles and reflect green light, and the cholesterol liquid crystal layer 23 reflects red light in the reflective state; or Fig.19 As shown, the first color is green, the second color is blue, and the third color is red, that is, the color reflector 30 is a green reflector and reflects green light, the second color ink particles 132 are blue ink particles and reflect blue light, and the cholesterol liquid crystal layer 23 reflects red light in the reflective state; or Fig. 20As shown, the first color is red, the second color is green, and the third color is blue, that is, the color reflector 30 is a red reflector and reflects red light, the second color ink particles 132 are green ink particles and reflect green light, and the cholesterol liquid crystal layer 23 reflects blue light in the reflective state; or Fig.21 As shown, the first color is green, the second color is red, and the third color is blue, that is, the color reflector 30 is a green reflector and reflects green light, the second color ink particles 132 are red ink particles and reflect red light, and the cholesterol liquid crystal layer 23 reflects blue light in the reflective state; or Fig. 22 As shown, the first color is blue, the second color is red, and the third color is green, that is, the color reflector 30 is a blue reflector and reflects blue light, the second color ink particles 132 are red ink particles and reflect red light, and the cholesterol liquid crystal layer 23 reflects green light in the reflective state; or Fig.23 As shown, the first color is red, the second color is blue, and the third color is green, that is, the color reflector 30 is a red reflector and reflects red light, the second color ink particles 132 are blue ink particles and reflect blue light, and the cholesterol liquid crystal layer 23 reflects green light in the reflective state.

[0098] 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.

[0099] Fig.24 and Fig.25 FIG. 1 is a schematic diagram of a planar structure of a display device in an embodiment of the present invention. Fig.24 and Fig.25 The display device is provided with a display mode switching button 40 for the user to send a display mode switching request to the display device. The display mode switching button 40 may be a physical button (such as Fig.24 As shown), it can also be a software control or application (APP) to implement the switching function (such as Fig.25 As shown, for example, the display mode is set by a slide bar). When the user needs to switch between the wide viewing angle mode and the narrow viewing angle mode, the user sends a viewing angle switching request to the display device by operating the display mode switching button 40, and finally the driving chip 50 controls the electrical signal applied to the first pixel electrode 121 and the first common electrode 111 and the electrical signal applied to the first side electrode 141 and the second side electrode 142, so that the display device can realize the switching between the wide viewing angle and the narrow viewing angle. When switching to the wide viewing angle, the driving method thereof adopts the driving method corresponding to the wide viewing angle mode, and when switching to the narrow viewing angle, the driving method thereof adopts the driving method corresponding to the narrow viewing angle mode. Therefore, the display device of the embodiment of the present invention has strong operational flexibility and convenience, and achieves a multifunctional display device integrating entertainment video and privacy.

[0100] 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.

[0101] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to the technical contents disclosed above without departing from the scope of the technical solution of the present invention, which are equivalent embodiments of equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A reflective display panel with switchable wide and narrow viewing angles, characterized in that: The invention comprises an electronic ink screen (10), a cholesterol liquid crystal box (20) and a color reflector (30) which are stacked in sequence, wherein the electronic ink screen (10) has a plurality of first pixel units (P1) distributed in an array, the cholesterol liquid crystal box (20) has a plurality of second pixel units (P2) distributed in an array, the first pixel units (P1) correspond to the second pixel units (P2) in a one-to-one manner, and the color reflector (30) is used for reflecting light of a first color; The electronic ink screen (10) comprises a first opposing substrate (11), a first array substrate (12) arranged opposite to the first opposing substrate (11), and a plurality of ink capsules (13) arranged between the first opposing substrate (11) and the first array substrate (12), wherein the ink capsules (13) correspond to the first pixel units (P1) one by one, each of the ink capsules (13) contains black ink particles (131) and second color ink particles (132) of opposite polarities, and the first opposing substrate (11) is provided with a first common electrode (111), a first pixel electrode (121) corresponding one-to-one to the first pixel unit (P1) being provided on the first array substrate (12), a first side electrode (141) and a second side electrode (142) parallel to each other being provided between the first opposing substrate (11) and the first array substrate (12), the first side electrode (141) corresponding one-to-one to the first pixel unit (P1), and the ink capsule (13) being located between adjacent first side electrodes (141) and second side electrodes (142); The cholesteric liquid crystal box (20) comprises a second opposing substrate (21), a second array substrate (22) arranged opposite to the second opposing substrate (21), and a cholesteric liquid crystal layer (23) located between the second opposing substrate (21) and the second array substrate (22), all of the cholesteric liquid crystal layers (23) reflect light of a third color in a reflective state, the second array substrate (22) is provided with a second pixel electrode (221) corresponding one-to-one to the second pixel unit (P2), and the second opposing substrate (21) is provided with a second common electrode (211) matched with the second pixel electrode (221); The reflective display panel comprises first strip regions (A1) and second strip regions (A2) which are alternately arranged. In a narrow viewing angle mode, the first pixel units (P1) corresponding to the first strip regions (A1) are controlled to be in a light absorbing state, and the first pixel units (P1) corresponding to the second strip regions (A2) are controlled to be in a light transmitting state or a light reflecting state. At this time, the electronic ink screen (10) presents a shutter structure.

2. The reflective display panel with switchable wide and narrow viewing angles according to claim 1, characterized in that: A plurality of first scanning lines (101), a plurality of first data lines (102) and a plurality of first thin film transistors (103) are provided on the first array substrate (12); the plurality of first scanning lines (101) and the plurality of first data lines (102) are cross-insulated and arranged to define a plurality of first pixel units (P1); and the first pixel electrode (121) is conductively connected to the first scanning line (101) and the first data line (102) adjacent to the first thin film transistor (103) through the first thin film transistor (103); The second array substrate (22) is provided with a plurality of second scanning lines (201), a plurality of second data lines (202) and a plurality of second thin film transistors (203); the plurality of second scanning lines (201) and the plurality of second data lines (202) are cross-insulated and arranged to define a plurality of second pixel units (P2); the second pixel electrode (221) is conductively connected to the second scanning line (201) and the second data line (202) adjacent to the second thin film transistor (203) through the second thin film transistor (203).

3. The reflective display panel with switchable wide and narrow viewing angles according to claim 2, characterized in that: A plurality of third thin film transistors (104) are also provided on the first array substrate (12), and the first side electrode (141) is conductively connected to the first scanning line (101) and the first data line (102) adjacent to the third thin film transistor (104) through the third thin film transistor (104); Any of the first pixel electrodes (121) and the first side electrodes (141) are respectively connected to two different first scanning lines (101) and / or two different first data lines (102).

4. The reflective display panel with switchable wide and narrow viewing angles according to claim 2, characterized in that: A plurality of third scanning lines (105), a plurality of third data lines (106) and a plurality of third thin film transistors (104) are provided on the first opposing substrate (11); the plurality of third scanning lines (105) and the plurality of third data lines (106) are cross-insulated and arranged to define a plurality of first pixel units (P1); the first side electrode (141) is conductively connected to the third scanning lines (105) and the third data lines (106) adjacent to the third thin film transistors (104) through the third thin film transistors (104).

5. The reflective display panel with switchable wide and narrow viewing angles according to claim 1, characterized in that: The first common electrode (111) is a planar electrode that covers the entire surface of the first opposing substrate (11) or a block electrode that corresponds one-to-one to the first pixel unit (P1); The second common electrode (211) is a planar electrode that entirely covers the second opposing substrate (21) or a block electrode that corresponds one-to-one to the second pixel units (P2).

6. The reflective display panel with switchable wide and narrow viewing angles according to claim 1, characterized in that: The second side electrode (142) is a strip electrode, and each of the second side electrodes (142) corresponds to a column / row of the first pixel unit (P1).

7. The reflective display panel with switchable wide and narrow viewing angles according to claim 6, characterized in that: The first opposing substrate (11) and / or the first array substrate (12) are provided with side electrode signal lines (143), and all the second side electrodes (142) are electrically connected to the side electrode signal lines (143); Alternatively, all of the second side electrodes (142) are electrically connected to the first common electrode (111).

8. The reflective display panel with switchable wide and narrow viewing angles according to any one of claims 1 to 7, characterized in that: The second color is white, and the first and third colors are monochromatic colors of different colors; Alternatively, the first color, the second color, and the third color are each one of red, green, and blue.

9. A method for driving a reflective display panel, characterized in that: Used to drive the reflective display panel with switchable wide and narrow viewing angles as claimed in any one of claims 1 to 8, the driving method comprising: In the wide viewing angle mode, the first pixel units (P1) in the electronic ink screen (10) are controlled to be in a corresponding light-transmitting state, a light-absorbing state and a light-reflecting state; In a narrow viewing angle mode, the first pixel unit (P1) corresponding to the first strip area (A1) is controlled to be in a light absorbing state, and the first pixel unit (P1) corresponding to the second strip area (A2) is controlled to be in a light transmitting state or a light reflecting state, and the first strip areas (A1) and the second strip areas (A2) are arranged alternately with each other. At this time, the electronic ink screen (10) presents a shutter structure.

10. The driving method of the reflective display panel according to claim 9, characterized in that: The driving method comprises: When the sub-pixel of the reflective display panel displays a first color, the corresponding first pixel unit (P1) and the second pixel unit (P2) are controlled to be in a light-transmitting state, and the color reflector (30) reflects the first color light; When the sub-pixel of the reflective display panel displays a second color, the corresponding first pixel unit (P1) is controlled to be in a reflective state and reflect the second color light, and the corresponding second pixel unit (P2) is controlled to be in a reflective state or a translucent state; When the sub-pixel of the reflective display panel displays a third color, the corresponding first pixel unit (P1) is controlled to be in a light-transmitting state, and the corresponding second pixel unit (P2) is controlled to be in a reflective state and reflect light of the third color; When a sub-pixel of a reflective display panel displays black, the corresponding first pixel unit (P1) is controlled to be in a light-absorbing state, and the corresponding second pixel unit (P2) is controlled to be in a reflective state or a light-transmitting state.

Images