Electronic paper display panel, driving method thereof, and display device

Abstract

The application discloses an electronic paper display panel and a driving method thereof and a display device, and mainly relates to the technical field of display. The first pixel unit comprises a first upper driving electrode, a first electrophoretic containing cavity and a first lower driving electrode, the first upper driving electrode and the first lower driving electrode are arranged on the two sides of the first electrophoretic containing cavity respectively, and the first pixel unit further comprises first light-absorbing particles, second light-absorbing particles and first light-reflecting particles arranged in the first electrophoretic containing cavity. The charge quantity of the first light-absorbing particles, the charge quantity of the first light-reflecting particles and the charge quantity of the second light-absorbing particles decrease in turn, the polarity of the first light-absorbing particles is the same as that of the second light-absorbing particles, and the polarity of the first light-absorbing particles is opposite to that of the first light-reflecting particles. The electronic paper display panel can be switched between double-sided display and single-sided display, and the picture resolution during single-sided display is improved.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to an electronic paper display panel and its driving method and display device. Background Technology

[0002] As people's demand for reading quality increases, the technology of electronic paper display panels has developed rapidly, and many novel electronic paper display panels are constantly being developed. Compared with ordinary paper reading, electronic paper display panel reading can greatly save ecological resources, and it also has many advantages such as low power consumption, thinness, long lifespan, and flexibility.

[0003] Current electronic paper display panels cannot meet the requirement of switching between single-sided and double-sided displays. Summary of the Invention

[0004] The purpose of this application is to provide an electronic paper display panel and its driving method and display device, which enables the electronic paper display panel to switch between double-sided display and single-sided display, and improves the screen resolution when displaying on a single side.

[0005] This application discloses an electronic paper display panel, which further includes a first substrate, a plurality of first pixel units, a plurality of second pixel units, and a second substrate. The first pixel units and the second pixel units are both located between the first substrate and the second substrate. The plurality of first pixel units and the plurality of second pixel units are arranged in a matrix, and the plurality of first pixel units and the plurality of second pixel units are spaced apart.

[0006] The first pixel unit includes a first upper driving electrode, a first electrophoresis receiving cavity, and a first lower driving electrode. The first upper driving electrode and the first lower driving electrode are respectively disposed on both sides of the first electrophoresis receiving cavity. The first pixel unit also includes a first light absorbing particle, a second light absorbing particle, and a first light reflecting particle disposed in the first electrophoresis receiving cavity.

[0007] The charge of the first light-absorbing particle, the charge of the first light-reflecting particle, and the charge of the second light-absorbing particle decrease sequentially. The first light-absorbing particle and the second light-absorbing particle have the same polarity, and the first light-absorbing particle and the first light-reflecting particle have opposite polarities.

[0008] Optionally, the second pixel unit includes a second upper driving electrode, a second electrophoresis receiving cavity, and a second lower driving electrode. The second upper driving electrode and the second lower driving electrode are respectively disposed on both sides of the second electrophoresis receiving cavity. The second pixel unit also includes a third light-absorbing particle, a fourth light-absorbing particle, and a second light-reflecting particle disposed in the second electrophoresis receiving cavity.

[0009] The charge of the third light-absorbing particle, the charge of the second light-reflecting particle, and the charge of the fourth light-absorbing particle decrease sequentially. The third light-absorbing particle and the fourth light-absorbing particle have the same polarity, and the third light-absorbing particle and the second light-reflecting particle have opposite polarities.

[0010] Optionally, the electronic paper display panel further includes a light-shielding layer disposed on the first substrate, and the orthographic projection of the light-shielding layer on the first substrate covers the orthographic projection of the second pixel unit on the first substrate;

[0011] The second pixel unit includes a second upper driving electrode, a second electrophoresis accommodating cavity, and a second lower driving electrode. The second upper driving electrode and the second lower driving electrode are respectively disposed on both sides of the second electrophoresis accommodating cavity. The second pixel unit also includes a multistable liquid crystal disposed in the second electrophoresis accommodating cavity. The side of the second substrate facing away from the first substrate is the display surface of the second pixel unit.

[0012] Optionally, the electronic paper display panel may also include a first driving unit, a second driving unit, a third driving unit, and a fourth driving unit;

[0013] The first driving unit is connected to the first upper driving electrode, the second driving unit is connected to the first lower driving electrode, the third driving unit is connected to the second upper driving electrode, and the fourth driving unit is connected to the second lower driving electrode.

[0014] The second driving unit, the fourth driving unit, the first lower driving electrode, and the second lower driving electrode are all disposed on the first substrate; the first driving unit, the third driving unit, the first upper driving electrode, and the second upper driving electrode are all disposed on the second substrate.

[0015] The second driving unit and the fourth driving unit are located within the orthographic projection of the light-shielding layer on the first substrate, and the first driving unit and the third driving unit are located within the orthographic projection of the first pixel unit on the second substrate.

[0016] Optionally, the electronic paper display panel further includes a magnetic layer disposed on the second substrate and located between the first pixel unit and the second substrate, wherein the second light-absorbing particles are magnetic.

[0017] Optionally, the magnetic layer is located on the side of the first lower driving electrode facing the first upper driving electrode, and the material of the magnetic layer includes a carbon-based magnetic material.

[0018] Optionally, the direction in which the first substrate faces the second substrate is defined as the first direction, the width of the first electrophoresis containment cavity gradually decreases along the first direction, and the width of the second electrophoresis containment cavity gradually increases along the first direction.

[0019] Optionally, the number of the second light-absorbing particles is less than the number of the first light-absorbing particles, and the number of the second light-absorbing particles is less than the number of the first light-reflecting particles.

[0020] This application also discloses a control method for an electronic paper display panel, the control method for controlling the electronic paper display panel includes the following steps:

[0021] When switched to a mode where the display surfaces of the first pixel unit and the second pixel unit are on different sides, the first upper driving electrode and the first lower driving electrode are used to drive the second light-absorbing particle to be located on the side of the first light-reflecting particle closer to the display surface of the second pixel unit.

[0022] This application also discloses a display device, which includes a driving circuit and an electronic paper display panel. The driving circuit is connected to the electronic paper display panel and is used to control the display screen of the electronic paper display panel.

[0023] Compared to existing electronic paper display panel solutions, the solution of this application sets a first pixel unit and a second pixel unit spaced apart between a first substrate and a second substrate. The first electrophoretic cavity of the first pixel unit contains a first light-absorbing particle, a second light-absorbing particle, and a first light-reflecting particle. The charge of the first light-absorbing particle, the charge of the first light-reflecting particle, and the charge of the second light-absorbing particle decrease sequentially. The first light-absorbing particle and the second light-absorbing particle have the same polarity, while the first light-absorbing particle and the first light-reflecting particle have opposite polarities. This allows the first upper control electrode and the first lower control electrode to control the second light-absorbing particle to be positioned on the side of the first light-reflecting particle closer to the display surface of the second pixel unit. This enables the electronic paper display panel to switch between double-sided and single-sided display, improving its applicability. When switching to single-sided display, the first pixel unit and the second pixel unit jointly display one image, improving the screen resolution of the electronic paper display panel in single-sided display mode. Attached Figure Description

[0024] The accompanying drawings, which form part of the specification, are used to provide a further understanding of the embodiments of this application and illustrate the implementation methods of this application, together with the textual description, to explain the principles of this application. Obviously, the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings:

[0025] Figure 1 This is a schematic diagram of a display device according to an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of the first pixel unit absorbing light when the display surfaces of the first pixel unit and the second pixel unit are on different sides in an electronic paper display panel according to the first embodiment of this application.

[0027] Figure 3 This is a schematic diagram of light reflected by the first pixel unit in an electronic paper display panel according to the first embodiment of this application when the display surfaces of the first pixel unit and the second pixel unit are on different sides;

[0028] Figure 4 This is a schematic diagram of light absorption by the first pixel unit in an electronic paper display panel according to the first embodiment of this application, where the display surfaces of the first pixel unit and the second pixel unit are on the same side;

[0029] Figure 5This is a schematic diagram of light reflected by the first pixel unit in an electronic paper display panel according to the first embodiment of this application, where the display surfaces of the first pixel unit and the second pixel unit are on the same side;

[0030] Figure 6 This is a schematic diagram of a first pixel unit and a second pixel unit arranged at intervals in one of the first embodiments of this application;

[0031] Figure 7 This is a schematic diagram of another arrangement of the first pixel unit and the second pixel unit in the first embodiment of this application;

[0032] Figure 8 This is a schematic diagram of a driving unit according to the first embodiment of this application;

[0033] Figure 9 This is a schematic diagram of the second and fourth driving units in another driving unit according to the first embodiment of this application;

[0034] Figure 10 This is a schematic diagram of the first driving unit and the third driving unit in another driving unit of the first embodiment of this application;

[0035] Figure 11 This is a schematic diagram of a magnetic layer according to the first embodiment of this application;

[0036] Figure 12 This is a schematic diagram of an electromagnetic unit according to the first embodiment of this application;

[0037] Figure 13 This is a schematic diagram of a first electrophoresis receiving cavity and a second electrophoresis receiving cavity according to the first embodiment of this application;

[0038] Figure 14 This is a schematic diagram of an electronic paper display panel according to a second embodiment of this application;

[0039] Figure 15 This is a schematic diagram of a control method for an electronic paper display panel according to an embodiment of this application.

[0040] Among them, 10 is a display device; 20 is a driving circuit; 30 is an electronic paper display panel; 110 is a first substrate; 120 is a second substrate; 200 is a first pixel unit; 210 is a first upper driving electrode; 220 is a first electrophoresis receiving cavity; 230 is a first lower driving electrode; 240 is a first light-absorbing particle; 250 is a second light-absorbing particle; 260 is a first light-reflecting particle; 300 is a second pixel unit; 310 is a second upper driving electrode; 320 is a second electrophoresis receiving cavity; 330 is a second lower driving electrode; 340 is a third light-absorbing particle; 350 is a fourth light-absorbing particle; 360 is a second light-reflecting particle; 370 is a multi-stable liquid crystal; 410 is a first driving unit; 420 is a second driving unit; 430 is a third driving unit; 440 is a fourth driving unit; 510 is a light-shielding layer; 520 is a magnetic layer; 600 is an electromagnetic unit; 610 is an electromagnetic electrode plate; and 620 is an electromagnetically controlled active switch. Detailed Implementation

[0041] It should be understood that the terminology, specific structural and functional details used herein are merely for describing particular embodiments and are representative. However, this application may be implemented in many alternative forms and should not be construed as being limited to the embodiments set forth herein.

[0042] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating relative importance or implying the number of technical features indicated. Therefore, unless otherwise stated, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "multiple" means two or more. The term "comprising" and any variations thereof mean non-exclusive inclusion, where one or more other features, integers, steps, operations, units, components, and / or combinations thereof may be present or added.

[0043] In addition, terms such as “center,” “horizontal,” “up,” “down,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer” that indicate orientation or positional relationship are based on the orientation or relative positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this application and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0044] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0045] The present application will now be described in detail with reference to the accompanying drawings and optional embodiments.

[0046] Figure 1 This is a schematic diagram of a display device according to an embodiment of this application, as shown below. Figure 1 As shown, this application discloses a display device 10, which includes a driving circuit 20 and an electronic paper display panel 30. The driving circuit 20 is connected to the electronic paper display panel 30 and is used to control the electronic paper display panel 30 to display an image.

[0047] For example, the driving circuit 20 is used to charge the first upper driving electrode 210, the first lower driving electrode 230, the second upper driving electrode 310, and the second lower driving electrode 330 in the electronic paper display panel 30 with the required voltage, so that an electric field is formed between the first upper driving electrode 210 and the first lower driving electrode 230, controlling the first light absorbing particle 240, the second light absorbing particle 250, and the first light reflecting particle 260 to move within the electric field; an electric field is formed between the second upper driving electrode 310 and the second lower driving electrode 330, controlling the third light absorbing particle 340, the fourth light absorbing particle 350, and the second light reflecting particle 360 ​​to move within the electric field, or controlling the deflection of the multistable liquid crystal 370.

[0048] This application also discloses an electronic paper display panel 30, which can be used in the display device 10 described above. Regarding the electronic paper display panel 30, this application provides the following design, which is specifically described through several embodiments:

[0049] Example 1:

[0050] Figure 2 This is a schematic diagram illustrating the absorption of light by the first pixel unit when the display surfaces of the first pixel unit and the second pixel unit are on different sides in an electronic paper display panel according to the first embodiment of this application. Figure 3 This is a schematic diagram of light reflected by the first pixel unit in an electronic paper display panel according to the first embodiment of this application, where the display surfaces of the first pixel unit and the second pixel unit are on different sides.

[0051] Figure 4This is a schematic diagram illustrating the absorption of light by the first pixel unit in an electronic paper display panel according to the first embodiment of this application, where the display surfaces of the first pixel unit and the second pixel unit are on the same side. Figure 5 This is a schematic diagram of the reflection of light by the first pixel unit in an electronic paper display panel according to the first embodiment of this application, where the display surfaces of the first pixel unit and the second pixel unit are on the same side. Figures 2-5 As shown.

[0052] Absorbing light can be understood as displaying black, while reflecting light can be understood as reflecting white or the color of the particle itself. For example, when the particle is white, it will be displayed as white, and when the particle is red, green, or blue, it will be displayed as red, green, or blue.

[0053] This application also discloses an electronic paper display panel 30, which further includes a first substrate 110, a plurality of first pixel units 200, a plurality of second pixel units 300, and a second substrate 120. The first pixel units 200 and the second pixel units 300 are both located between the first substrate 110 and the second substrate 120. The plurality of first pixel units 200 and the plurality of second pixel units 300 are arranged in a matrix, and the plurality of first pixel units 200 and the plurality of second pixel units 300 are spaced apart.

[0054] The first pixel unit 200 includes a first upper driving electrode 210, a first electrophoresis receiving cavity 220 and a first lower driving electrode 230. The first upper driving electrode 210 and the first lower driving electrode 230 are respectively disposed on both sides of the first electrophoresis receiving cavity 220. The first pixel unit 200 also includes a first light absorbing particle 240, a second light absorbing particle 250 and a first light reflecting particle 260 disposed in the first electrophoresis receiving cavity 220.

[0055] The charge of the first light-absorbing particle 240, the charge of the first light-reflecting particle 260, and the charge of the second light-absorbing particle 250 decrease sequentially. The first light-absorbing particle 240 and the second light-absorbing particle 250 have the same polarity, and the first light-absorbing particle 240 and the first light-reflecting particle 260 have opposite polarities.

[0056] It is permissible for the first light-absorbing particle 240 and the second light-absorbing particle 250 to both be negatively polarized, and for the first light-reflecting particle 260 to be positively polarized; alternatively, it is permissible for the first light-absorbing particle 240 and the second light-absorbing particle 250 to both be positively polarized, and for the first light-reflecting particle 260 to be negatively polarized. For ease of explanation, this application uses the example of the first light-absorbing particle 240 and the second light-absorbing particle 250 being positively polarized, and the first light-reflecting particle 260 being negatively polarized.

[0057] For ease of explanation, this application uses the example of the first light-absorbing particle 240 and the second light-absorbing particle 250 being black, and the first light-reflecting particle 260 being white. Of course, the first light-reflecting particle 260 being red, green, or blue is also within the scope of protection of this application.

[0058] For example, a first substrate 110 can be used as a base, the first pixel unit 200 and the second pixel unit 300 can be disposed on the first substrate 110, the first lower driving electrode 230 can be disposed on the first substrate 110, and the first upper driving electrode 210 can be disposed on the side of the first electrophoresis receiving cavity 220 away from the first substrate 110. In this way, by charging the first upper driving electrode 210 and the first lower driving electrode 230 through the driving circuit 20, the first light absorbing particle 240, the second light absorbing particle 250 and the first light reflecting particle 260 in the first electrophoresis receiving cavity 220 can be driven to move to display the image.

[0059] For example, when the display surfaces of the first pixel unit 200 and the second pixel unit 300 are on different sides, the first upper driving electrode 210 and the first lower driving electrode 230 are used to drive the second light absorbing particle 250 to be located on the side of the first light reflecting particle 260 that is close to the display surface of the second pixel unit 300.

[0060] For example, when the display surface of the second pixel unit 300 is the side of the second substrate 120 that is away from the first substrate 110, then the display surface of the first pixel unit 200 is the side of the first substrate 110 that is away from the second substrate 120.

[0061] When the first pixel unit 200 needs to display white, a negative voltage can be applied to the first upper driving electrode 210, causing the second light-absorbing particle 250 and the first light-absorbing particle 240 to move upward; a positive voltage can be applied to the first lower driving electrode 230, causing the first light-reflecting particle 260 to move downward; thereby making the first pixel unit 200 display white, and the side of the first pixel unit 200 facing the second substrate 120 is the second light-absorbing particle 250, which will not interfere with the display of the second pixel unit 300.

[0062] When the first pixel unit 200 needs to display black, a negative voltage can be applied to the first upper driving electrode 210, causing the second light-absorbing particle 250 and the first light-absorbing particle 240 to move upward; a positive voltage can be applied to the first lower driving electrode 230, causing the first light-reflecting particle 260 to move downward.

[0063] Then, a negative voltage is applied to the first lower driving electrode 230 and a positive voltage is applied to the first upper driving electrode 210. Since the charge of the first light-absorbing particle 240 is greater than the charge of the second light-absorbing particle 250, the movement of the second light-absorbing particle 250 also needs to overcome the friction between the electrophoretic liquids.

[0064] Therefore, the magnitude of the negative voltage applied to the first lower driving electrode 230 and the positive voltage applied to the first upper driving electrode 210 is sufficient to move the first light-absorbing particle 240, but insufficient to move the second light-absorbing particle 250. Thus, the first light-reflecting particle 260 is located between the first light-absorbing particle 240 and the second light-absorbing particle 250, and the side of the first pixel unit 200 facing the second substrate 120 is occupied by the second light-absorbing particle 250. This results in the first pixel unit 200 displaying black on both the side facing the first substrate 110 and the side facing the second substrate 120, without interfering with the display of the second pixel unit 300.

[0065] When the display surfaces of the first pixel unit 200 and the second pixel unit 300 are on the same side, the first pixel unit 200 and the second pixel unit 300 can be used to display an image. For example, when the display surface of the second pixel unit 300 is the side of the second substrate 120 away from the first substrate 110, the side of the first substrate 110 facing away from the second substrate 120 is not used for displaying an image. Therefore, even if the first light reflecting particle 260 moves to the side of the first substrate 110, it does not matter and does not affect the image display on the side of the second substrate 120 facing away from the first substrate 110.

[0066] At this time, when both the first pixel unit 200 and the second pixel unit 300 need to display black, a positive voltage is applied to the first upper driving electrode 210, causing the first light reflecting particle 260 to move upward, and a negative voltage is applied to the first lower driving electrode 230, causing the first light absorbing particle 240 and the second light absorbing particle 250 to move downward.

[0067] When both the first pixel unit 200 and the second pixel unit 300 need to display white, a negative voltage is applied to the first upper driving electrode 210, causing the first light absorbing particle 240 to move upward or both the first light absorbing particle 240 and the second light absorbing particle 250 to move upward. A positive voltage is applied to the first lower driving electrode 230, causing the first light reflecting particle 260 to move downward.

[0068] Compared to existing electronic paper display panel solutions, the solution in this application involves setting a first pixel unit 200 and a second pixel unit 300 between a first substrate 110 and a second substrate 120. Then, a first light-absorbing particle 240, a second light-absorbing particle 250, and a first light-reflecting particle 260 are disposed within the first electrophoretic cavity 220 of the first pixel unit 200. The charge of the first light-absorbing particle 240, the charge of the first light-reflecting particle 260, and the charge of the second light-absorbing particle 250 decrease sequentially. The charge of the first light-absorbing particle 240 and the second light-absorbing particle 250... The first light-absorbing particle 240 and the first light-reflecting particle 260 have the same polarity, and their polarities are opposite. This allows the first upper control electrode and the first lower control electrode to control the second light-absorbing particle 250 to be located on the side of the first light-reflecting particle 260 closer to the display surface of the second pixel unit 300. This enables the electronic paper display panel 30 to switch between double-sided and single-sided display, improving the applicability of the electronic paper display panel 30. When switching to single-sided display, the first pixel unit 200 and the second pixel unit 300 jointly display the same image, which can improve the image resolution of the electronic paper display panel 30 in single-sided display.

[0069] Figure 6 This is a schematic diagram of one embodiment of the first pixel unit and the second pixel unit arranged at intervals. Figure 7 This is a schematic diagram of another arrangement of the first pixel unit and the second pixel unit according to the first embodiment of this application, in conjunction with... Figure 6 and Figure 7 As shown, for example, since an electronic paper display panel 30 includes a plurality of first pixel units 200 and a plurality of second pixel units 300, it is possible that a first pixel unit 200 and a second pixel unit 300 are spaced apart, that is, the first pixel unit 200 is located between two adjacent second pixel units 300, and the second pixel unit 300 is located between two adjacent first pixel units 200.

[0070] For example, the three first pixel units 200 and the three second pixel units 300 can also be arranged sequentially, that is, the three first pixel units 200 are located between two adjacent second pixel units 300, and the three second pixel units 300 are located between two adjacent first pixel units 200. In other words, the three first pixel units 200 form a group, and the three second pixel units 300 form a group. In the horizontal direction, one group of first pixel units 200 is located between two adjacent groups of second pixel units 300, and one group of second pixel units 300 is located between two adjacent groups of first pixel units 200.

[0071] For example, it is also possible to have one first pixel unit 200 as a group and three second pixel units 300 as a group, with one group of first pixel units 200 located between two adjacent groups of second pixel units 300, and one group of second pixel units 300 located between two adjacent groups of first pixel units 200.

[0072] The alternating arrangement of the first pixel unit 200 and the second pixel unit 300 should all fall within the protection scope of this application.

[0073] See Figures 2-5 In this embodiment, the display surface of the second pixel unit 300 is fixed. The electronic paper display panel 30 also includes a light-shielding layer 510, which is disposed on the first substrate 110. The orthogonal projection of the light-shielding layer 510 on the first substrate 110 covers the orthogonal projection of the second pixel unit 300 on the first substrate 110.

[0074] The second pixel unit 300 includes a second upper driving electrode 310, a second electrophoresis receiving cavity 320, and a second lower driving electrode 330. The second upper driving electrode 310 and the second lower driving electrode 330 are respectively disposed on both sides of the second electrophoresis receiving cavity 320. The second pixel unit 300 also includes a multistable liquid crystal 370 disposed in the second electrophoresis receiving cavity 320. The side of the second substrate 120 facing away from the first substrate 110 is the display surface of the second pixel unit 300.

[0075] The display surface of the second pixel unit 300 is fixed on the side of the second substrate 120 that is away from the first substrate 110. Then, by setting a light-shielding layer 510 on the first substrate 110, the control difficulty can be reduced. Moreover, by setting a light-shielding layer 510 on the first substrate 110, when the display surfaces of the first pixel unit 200 and the second pixel unit 300 are displayed on different sides, the side of the second pixel unit 300 that is closer to the first substrate 110 will not emit light, and will not affect the normal display of the first pixel unit 200. The light-shielding layer 510 can be made of black matrix material.

[0076] In this application, the display surface of the second pixel unit 300 is fixed as the side of the second substrate 120 that is away from the first substrate 110. Of course, the display surface of the second pixel unit 300 can also be fixed as the side of the first substrate 110 that is away from the second substrate 120, as long as the light-shielding layer 510 is adjusted onto the second substrate 120.

[0077] Figure 8 This is a schematic diagram of a driving unit according to the first embodiment of this application, see below. Figure 8 As shown, the electronic paper display panel 30 also includes a first driving unit 410, a second driving unit 420, a third driving unit 430, and a fourth driving unit 440.

[0078] The first driving unit 410 is connected to the first upper driving electrode 210, the second driving unit 420 is connected to the first lower driving electrode 230, the third driving unit 430 is connected to the second upper driving electrode 310, and the fourth driving unit 440 is connected to the second lower driving electrode 330.

[0079] The second driving unit 420, the fourth driving unit 440, the first lower driving electrode 230 and the second lower driving electrode 330 are all disposed on the first substrate 110; the first driving unit 410, the third driving unit 430, the first upper driving electrode 210 and the second upper driving electrode 310 are all disposed on the second substrate 120.

[0080] The second driving unit 420 and the fourth driving unit 440 are located within the orthographic projection of the light-shielding layer 510 on the first substrate 110, and the first driving unit 410 and the third driving unit 430 are located within the orthographic projection of the first pixel unit 200 on the second substrate 120.

[0081] Among them, the first driving unit 410, the second driving unit 420, the third driving unit 430 and the fourth driving unit 440 are all dual-gate active switches. Since the area of ​​the dual-gate active switches is large, the second driving unit 420 and the fourth driving unit 440 are disposed under the light-shielding layer 510. This can improve the effective display area of ​​the first pixel unit 200, i.e., the aperture ratio, when the display surfaces of the first pixel unit 200 and the second pixel unit 300 are on different sides.

[0082] Figure 9 This is a schematic diagram of the second and fourth drive units in another drive unit of the first embodiment of this application. Figure 10 This is a schematic diagram of the first driving unit and the third driving unit in another driving unit of the first embodiment of this application, combined with... Figures 9-10 As shown, the first driving unit 410 is connected to the first upper driving electrode 210, the second driving unit 420 is connected to the first lower driving electrode 230, the third driving unit 430 is connected to the second upper driving electrode 310, and the fourth driving unit 440 is connected to the second lower driving electrode 330.

[0083] The first driving unit 410, the second driving unit 420, the third driving unit 430, the fourth driving unit 440, the first lower driving electrode 230 and the second lower driving electrode 330 are all disposed on the first substrate 110; the first upper driving electrode 210 and the second upper driving electrode 310 are both disposed on the second substrate 120.

[0084] The first driving unit 410, the second driving unit 420, the third driving unit 430, and the fourth driving unit 440 are located within the orthogonal projection of the light-shielding layer 510 onto the first substrate 110.

[0085] The first driving unit 410, the second driving unit 420, the third driving unit 430, and the fourth driving unit 440 are all disposed on the first substrate 110, and are all located below the light-shielding layer 510. The second driving unit 420 and the fourth driving unit 440 can be directly connected to the first lower driving electrode 230 and the second lower driving electrode 330. The first driving unit 410 and the second driving unit 420 are connected to the first upper driving electrode 210 and the second upper driving electrode 310 on the other side by a connecting line provided in the second electrophoresis receiving cavity 320. In this way, whether it is a single-sided display or a double-sided display, the first driving unit 410, the second driving unit 420, the third driving unit 430, and the fourth driving unit 440 will not affect the effective display area of ​​the electronic paper display panel 30, i.e., the aperture ratio.

[0086] Figure 11 This is a schematic diagram of a magnetic layer according to the first embodiment of this application. See also: Figure 11As shown, when the display surfaces of the first pixel unit 200 and the second pixel unit 300 are on different sides, for example, when the display surface of the second pixel unit 300 is the side of the second substrate 120 away from the first substrate 110, the display surface of the first pixel unit 200 is the side of the first substrate 110 away from the second substrate 120; it is necessary to control the first upper driving electrode 210 to drive the second light absorbing particle 250 to move towards the second substrate 120, and then the first lower driving electrode 230 drives the first light reflecting particle 260 and the first light absorbing particle 240 to display the image.

[0087] In particular, when the first pixel unit 200 displays black, a negative voltage needs to be applied to the first upper driving electrode 210 first, causing the second light-absorbing particle 250 and the first light-absorbing particle 240 to move upward; a positive voltage needs to be applied to the first lower driving electrode 230 first, causing the first light-reflecting particle 260 to move downward; then a negative voltage needs to be applied to the first lower driving electrode 230 and a positive voltage to the first upper driving electrode 210. Since the charge of the first light-absorbing particle 240 is greater than the charge of the second light-absorbing particle 250, the magnitude of the applied negative voltage of the first lower driving electrode 230 and the positive voltage of the first upper driving electrode 210 can make the first light-absorbing particle 240 move, but will not make the second light-absorbing particle 250 move.

[0088] The first light-reflecting particle 260 is located between the first light-absorbing particle 240 and the second light-absorbing particle 250, so that the side of the first pixel unit 200 facing the first substrate 110 and the side facing the second substrate 120 both display black, and the side of the first pixel unit 200 facing the second substrate 120 is the second light-absorbing particle 250, which will not interfere with the display of the second pixel unit 300.

[0089] However, there will still be a slight repulsive force between the positive voltage of the first upper driving electrode 210 and the second light-absorbing particle 250. To prevent the repulsive force from causing the second light-absorbing particle 250 to move towards the first substrate 110 and causing the first pixel unit 200 to leak light in the direction away from the first substrate 110 on the second substrate 120, this application also provides a magnetic layer 520 on the second substrate 120, and then provides a magnetic material on the second light-absorbing particle 250; specifically:

[0090] The electronic paper display panel 30 further includes a magnetic layer 520, which is disposed on the second substrate 120 and located between the first pixel unit 200 and the second substrate 120. The second light-absorbing particle 250 is magnetic.

[0091] This allows the second light-absorbing particles 250 to adhere more closely to the side of the first electrophoresis containment cavity 220 closest to the second substrate 120. When the display surfaces of the first pixel unit 200 and the second pixel unit 300 are on different sides, and the first pixel unit 200 displays black, the first pixel unit 200 will not reflect light in the direction away from the first substrate 110 on the second substrate 120, thus not affecting the normal picture when the electronic paper display panel 30 is displayed on both sides.

[0092] Furthermore, the magnetic layer 520 is located on the side of the first upper driving electrode 210 facing the first lower driving electrode 230, and the material of the magnetic layer 520 includes a carbon-based magnetic material. The fact that the magnetic layer 520 is made of a carbon-based magnetic material ensures that it does not affect the electric field between the first upper driving electrode 210 and the first lower driving electrode 230, thus preventing the uncontrollable situation where the first light-absorbing particle 240, the second light-absorbing particle 250, and the first light-reflecting particle 260 cannot be controlled.

[0093] Figure 12 This is a schematic diagram of an electromagnetic unit according to the first embodiment of this application. See also: Figure 12 As shown, the electronic paper display panel 30 further includes an electromagnetic unit 600, which includes an electromagnetic electrode plate 610 and an electromagnetic control active switch 620. The electromagnetic electrode plate 610 and the electromagnetic control switch are both disposed on the second substrate 120, and the electromagnetic electrode plate 610 is located between the first upper driving electrode 210 and the second substrate 120. The electromagnetic electrode plate 610 is used to generate a controllable magnetic field to control the movement of the second light-absorbing particles 250.

[0094] The gate of the electromagnetic active switch is connected to the first upper driving electrode 210. When the first pixel unit 200 needs to display black, the first upper driving electrode 210 needs to be loaded with a positive voltage. At the same time, the electromagnetic active switch 620 can be turned on, so that external current can pass through the electromagnetic active switch, causing the electromagnetic electrode plate 610 to generate magnetism.

[0095] When the first pixel unit 200 needs to display white, the first upper driving electrode 210 needs to be loaded with a negative voltage, preventing the electromagnetic control active switch 620 from opening. This prevents external current from passing through the electromagnetic active switch, causing the second light-absorbing particle 250 to move, thus avoiding affecting the movement of the first light-absorbing particle 240 and the first light-reflecting particle 260. This reduces the difficulty of control.

[0096] Furthermore, the intensity of the electromagnetic electrode plate 610 increases as the gray level of the first pixel unit 200 decreases, in order to prevent the second light-absorbing particles 250 from moving downward toward the first substrate 110.

[0097] Figure 13 This is a schematic diagram of a first electrophoresis receiving cavity and a second electrophoresis receiving cavity according to the first embodiment of this application. See also... Figure 13 As shown, the direction from the first substrate 110 to the second substrate 120 is defined as the first direction. The width of the first electrophoresis receiving cavity 220 gradually decreases along the first direction, and the width of the second electrophoresis receiving cavity 320 gradually increases along the first direction. Thus, in double-sided display, both the first pixel unit 200 and the second pixel unit 300 have a large effective display area.

[0098] Moreover, this setting allows the number of the second light-absorbing particles 250 to be less than the number of the first light-absorbing particles 240, and the number of the second light-absorbing particles 250 to be less than the number of the first light-reflecting particles 260.

[0099] By gradually decreasing the width of the first electrophoresis cavity 220 along the first direction, even a smaller number of second light-absorbing particles 250 are sufficient to cover the side of the first electrophoresis cavity 220 near the second substrate 120. This reduces the number of second light-absorbing particles 250, making the total amount of second light-absorbing particles 250 and first light-absorbing particles 240 less different from the total amount of first light-reflecting particles 260. Furthermore, the total charge of the second light-absorbing particles 250 and first light-absorbing particles 240 is equal to the total charge of the first light-reflecting particles 260.

[0100] This avoids uneven migration and distribution of the first light-absorbing particles 240 and the first light-reflecting particles 260, which could lead to local color deviations or grayscale abnormalities on the screen, such as white areas appearing dim due to insufficient first light-reflecting particles 260.

[0101] Example 2:

[0102] Figure 14 This is a schematic diagram of an electronic paper display panel according to a second embodiment of this application. See also... Figure 14As shown, unlike the first embodiment, the second electrophoresis receiving cavity 320 of the second pixel unit 300 in this embodiment is provided with a third light-absorbing particle 340, a fourth light-absorbing particle 350 and a second light-reflecting particle 360. The second pixel unit 300 includes a second upper driving electrode 310, a second electrophoresis receiving cavity 320 and a second lower driving electrode 330. The second upper driving electrode 310 and the second lower driving electrode 330 are respectively disposed on both sides of the second electrophoresis receiving cavity 320. The second pixel unit 300 also includes the third light-absorbing particle 340, the fourth light-absorbing particle 350 and the second light-reflecting particle 360 ​​disposed in the second electrophoresis receiving cavity 320.

[0103] The charge of the third light-absorbing particle 340, the charge of the second light-reflecting particle 360, and the charge of the fourth light-absorbing particle 350 decrease sequentially. The third light-absorbing particle 340 and the fourth light-absorbing particle 350 have the same polarity, and the third light-absorbing particle 340 and the second light-reflecting particle 360 ​​have opposite polarities.

[0104] For example, a first substrate 110 can be used as a base, the second lower driving electrode 330 can be disposed on the first substrate 110, and the second upper driving electrode 310 can be disposed on the side of the first electrophoresis receiving cavity 220 away from the first substrate 110. In this way, by charging the second upper driving electrode 310 and the second lower driving electrode 330 through the driving circuit 20, the first light absorbing particle 240, the second light absorbing particle 250 and the first light reflecting particle 260 in the first electrophoresis receiving cavity 220 can be driven to move to display the image.

[0105] Compared to existing electronic paper display panel solutions, the solution in this application involves setting a first pixel unit 200 and a second pixel unit 300 between a first substrate 110 and a second substrate 120. Then, a first light-absorbing particle 240, a second light-absorbing particle 250, and a first light-reflecting particle 260 are disposed within the first electrophoretic cavity 220 of the first pixel unit 200. The charge of the first light-absorbing particle 240, the charge of the first light-reflecting particle 260, and the charge of the second light-absorbing particle 250 decrease sequentially. The charge of the first light-absorbing particle 240 and the second light-absorbing particle 250... The first light-absorbing particle 240 and the first light-reflecting particle 260 have the same polarity, and their polarities are opposite. This allows the first upper control electrode and the first lower control electrode to control the second light-absorbing particle 250 to be located on the side of the first light-reflecting particle 260 closer to the display surface of the second pixel unit 300. This enables the electronic paper display panel 30 to switch between double-sided and single-sided display, improving the applicability of the electronic paper display panel 30. When switching to single-sided display, the first pixel unit 200 and the second pixel unit 300 jointly display the same image, which can improve the image resolution of the electronic paper display panel 30 in single-sided display.

[0106] Moreover, compared to the solution of the first embodiment, this embodiment provides a third light-absorbing particle 340, a fourth light-absorbing particle 350, and a second light-reflecting particle 360 ​​within the second electrophoresis cavity 320. The charge of the third light-absorbing particle 340, the charge of the second light-reflecting particle 360, and the charge of the fourth light-absorbing particle 350 decrease sequentially. The third light-absorbing particle 340 and the fourth light-absorbing particle 350 have the same polarity, while the third light-absorbing particle 340 and the second light-reflecting particle 360 ​​have opposite polarities. Therefore, it is not necessary to provide a light-shielding layer 510 on the first substrate 110. Thus, when switching to a single-sided display, the side of the first substrate 110 facing away from the second substrate 120 can be used as one side of the display panel, and the side of the second substrate 120 facing away from the first substrate 110 can also be used as one side of the display panel.

[0107] Figure 15 This is a schematic diagram of a control method for an electronic paper display panel according to an embodiment of this application. See also: Figure 15 As shown, this application also discloses a control method for an electronic paper display panel 30. The control method for the electronic paper display panel 30 is used to control the electronic paper display panel 30, and includes the following steps:

[0108] S1: When switching to a mode where the display surfaces of the first pixel unit and the second pixel unit are on different sides, the first upper driving electrode and the first lower driving electrode are used to drive the second light-absorbing particle to be located on the side of the first light-reflecting particle that is closer to the display surface of the second pixel unit.

[0109] Wherein, S1: In the mode where the display surfaces of the first pixel unit and the second pixel unit are on different sides, the step of using the first upper driving electrode and the first lower driving electrode to drive the second light-absorbing particle to be located on the side of the display surface of the first light-reflecting particle closer to the second pixel unit further includes:

[0110] S11: When switching to a mode where the display surfaces of the first pixel unit and the second pixel unit are on different sides, when the first pixel unit needs to display black, a negative voltage is applied to the first upper driving electrode, causing the second light-absorbing particles and the first light-absorbing particles to move upward; a positive voltage is applied to the first lower driving electrode, causing the first light-reflecting particles to move downward.

[0111] S12: A negative voltage is applied to the first lower driving electrode, a positive voltage is applied to the first upper driving electrode, the first light-absorbing particle moves downward, and the first light-reflecting particle is located between the first light-absorbing particle and the second light-absorbing particle.

[0112] In this case, the negative voltage applied to the first lower driving electrode 230 is insufficient, which causes the second light-absorbing particle 250 to move against the resistance.

[0113] S13: When the first pixel unit needs to display white, a negative voltage is applied to the first upper driving electrode, causing the second light-absorbing particle and the first light-absorbing particle to move upward; a positive voltage is applied to the first lower driving electrode, causing the first light-reflecting particle to move downward.

[0114] The control method for the electronic paper display panel 30 further includes the following steps:

[0115] S2: When switching to a mode where the display surfaces of the first pixel unit and the second pixel unit are on the same side, the first upper driving electrode and the first lower driving electrode are used to drive the second light-absorbing particle to be located on the side of the first light-reflecting particle away from the display surface of the first pixel unit.

[0116] S2: In the mode where the display surfaces of the first pixel unit and the second pixel unit are on the same side, the step of using the first upper driving electrode and the first lower driving electrode to drive the second light-absorbing particle to be located on the side of the first light-reflecting particle away from the display surface of the first pixel unit includes:

[0117] S21: When switching to a mode where the display surfaces of the first pixel unit and the second pixel unit are on the same side, when the first pixel unit needs to display black, a negative voltage is applied to the first upper driving electrode, causing the second light-absorbing particles and the first light-absorbing particles to move upward; a positive voltage is applied to the first lower driving electrode, causing the first light-reflecting particles to move downward.

[0118] S22: When the first pixel unit needs to display white, a positive voltage is applied to the first upper driving electrode, causing the first light reflecting particle to move upward; a negative voltage is applied to the first lower driving electrode, causing the second light absorbing particle and the first light absorbing particle to move downward.

[0119] By setting a first pixel unit 200 and a second pixel unit 300 between a first substrate 110 and a second substrate 120, and then setting a first light-absorbing particle 240, a second light-absorbing particle 250, and a first light-reflecting particle 260 in the first electrophoretic accommodating cavity 220 of the first pixel unit 200, the charge of the first light-absorbing particle 240, the charge of the first light-reflecting particle 260, and the charge of the second light-absorbing particle 250 decreases sequentially. The first light-absorbing particle 240 and the second light-absorbing particle 250 have the same polarity. The absorptive particles 240 and the first light-reflecting particles 260 have opposite polarities; this allows the first upper control electrode and the first lower control electrode to control the second light-absorbing particles 250 to be located on the side of the first light-reflecting particles 260 closer to the display surface of the second pixel unit 300, enabling the electronic paper display panel 30 to switch between double-sided and single-sided display, thus improving the applicability of the electronic paper display panel 30; when switched to single-sided display, the first pixel unit 200 and the second pixel unit 300 jointly display the same image, which can improve the image resolution of the electronic paper display panel 30 in single-sided display.

[0120] It should be noted that the limitations on each step involved in this solution are not considered as limiting the order of steps, provided that they do not affect the implementation of the specific solution. The steps listed first can be executed first, later, or even simultaneously. As long as this solution can be implemented, it should be considered to fall within the scope of protection of this application.

[0121] It should be noted that the inventive concept of this application can form many embodiments, but due to the limited space of the application documents, they cannot all be listed. Therefore, without conflict, the embodiments described above or the technical features can be arbitrarily combined to form new embodiments. After the embodiments or technical features are combined, the original technical effect will be enhanced.

[0122] The above description, in conjunction with specific optional embodiments, provides a further detailed explanation of this application and should not be construed as limiting the specific implementation of this application to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of this application, and all such modifications or substitutions should be considered within the scope of protection of this application.

Claims

1. An electronic paper display panel, characterized by, The electronic paper display panel further comprises a first substrate, a plurality of first pixel units, a plurality of second pixel units and a second substrate, the first pixel units and the second pixel units are located between the first substrate and the second substrate, the plurality of first pixel units and the plurality of second pixel units are arranged in a matrix manner, and the plurality of first pixel units and the plurality of second pixel units are arranged in a spaced manner. The first pixel unit comprises a first upper driving electrode, a first electrophoretic containing cavity and a first lower driving electrode, the first upper driving electrode and the first lower driving electrode are arranged on two sides of the first electrophoretic containing cavity respectively, and the first pixel unit further comprises first light-absorbing particles, second light-absorbing particles and first light-reflecting particles arranged in the first electrophoretic containing cavity. The charge quantity of the first light-absorbing particles, the charge quantity of the first light-reflecting particles and the charge quantity of the second light-absorbing particles decrease in turn, the polarity of the first light-absorbing particles is the same as that of the second light-absorbing particles, and the polarity of the first light-absorbing particles is opposite to that of the first light-reflecting particles.

2. The electronic paper display panel of claim 1, wherein, The second pixel unit comprises a second upper driving electrode, a second electrophoretic containing cavity and a second lower driving electrode, the second upper driving electrode and the second lower driving electrode are arranged on two sides of the second electrophoretic containing cavity respectively, and the second pixel unit further comprises third light-absorbing particles, fourth light-absorbing particles and second light-reflecting particles arranged in the second electrophoretic containing cavity. The charge quantity of the third light-absorbing particles, the charge quantity of the second light-reflecting particles and the charge quantity of the fourth light-absorbing particles decrease in turn, the polarity of the third light-absorbing particles is the same as that of the fourth light-absorbing particles, and the polarity of the third light-absorbing particles is opposite to that of the second light-reflecting particles.

3. The electronic paper display panel of claim 1, wherein, The electronic paper display panel further comprises a light-shielding layer, the light-shielding layer is arranged on the first substrate, and the orthographic projection of the light-shielding layer on the first substrate covers the orthographic projection of the second pixel unit on the first substrate. The second pixel unit comprises a second upper driving electrode, a second electrophoretic containing cavity and a second lower driving electrode, the second upper driving electrode and the second lower driving electrode are arranged on two sides of the second electrophoretic containing cavity respectively, and the second pixel unit further comprises third light-absorbing particles, fourth light-absorbing particles and second light-reflecting particles arranged in the second electrophoretic containing cavity.

4. The electronic paper display panel of claim 3, wherein, The electronic paper display panel further comprises a first driving unit, a second driving unit, a third driving unit and a fourth driving unit. The first driving unit is connected with the first upper driving electrode, the second driving unit is connected with the first lower driving electrode, the third driving unit is connected with the second upper driving electrode, and the fourth driving unit is connected with the second lower driving electrode. The second driving unit, the fourth driving unit, the first lower driving electrode and the second lower driving electrode are arranged on the first substrate; the first driving unit, the third driving unit, the first upper driving electrode and the second upper driving electrode are arranged on the second substrate. The second driving unit and the fourth driving unit are located in the orthographic projection of the light shielding layer on the first substrate, and the first driving unit and the third driving unit are located in the orthographic projection of the first pixel unit on the second substrate.

5. The electronic paper display panel of claim 3, wherein, The electronic paper display panel further comprises a magnetic layer, the magnetic layer is arranged on the second substrate, and the magnetic layer is located between the first pixel unit and the second substrate, and the second light-absorbing particles have magnetism.

6. The electronic paper display panel of claim 5, wherein, The magnetic layer is located on the side of the first lower driving electrode facing the first upper driving electrode, and the material of the magnetic layer comprises a carbon-based magnetic material.

7. The electronic paper display panel of claim 3, wherein, The direction of the first substrate facing the second substrate is defined as the first direction, the width of the first electrophoretic containing cavity gradually decreases along the first direction, and the width of the second electrophoretic containing cavity gradually increases along the first direction.

8. The electronic paper display panel of claim 7, wherein, The number of the second light-absorbing particles is less than the number of the first light-absorbing particles, and the number of the second light-absorbing particles is less than the number of the first light-reflecting particles. 9.A method for controlling an electronic paper display panel, characterized by, The control method of the electronic paper display panel is used for controlling the electronic paper display panel in any one of claims 1-8, and the control method of the electronic paper display panel comprises the steps of: When switching to a mode in which the display surfaces of the first pixel unit and the second pixel unit are different sides, the first upper driving electrode and the first lower driving electrode are used to drive the second light-absorbing particles to be located on the side of the first light-reflecting particles close to the display surface of the second pixel unit.

10. A display device, characterized by comprising: The display device comprises a driving circuit and the electronic paper display panel in any one of claims 1-8, the driving circuit is connected with the electronic paper display panel, and is used for controlling the electronic paper display panel to display a picture.

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