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

Abstract

The application discloses an electronic paper display panel and a driving method and an electronic paper display device thereof, and mainly relates to the technical field of display. The electronic paper display panel comprises an array substrate, an electrophoretic particle reflection layer and a common electrode layer. The electrophoretic particle reflection layer is arranged on the array substrate, and the common electrode layer is arranged on the side of the electrophoretic particle reflection layer away from the array substrate. The electrophoretic particle reflection layer comprises first electrophoretic particles and second electrophoretic particles. The first electrophoretic particles comprise a first light reflection part and a first light absorption part, and the first light reflection part and the first light absorption part are connected. The second electrophoretic particles comprise a second light reflection part and a second light absorption part, and the second light reflection part and the second light absorption part are connected. Only the first light reflection part in the first electrophoretic particles has a first polarity, and only the second light absorption part in the second electrophoretic particles has a second polarity. Through the above design, the response speed of the electronic paper display panel is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to an electronic paper display panel, a driving method thereof and an electronic paper display device. BACKGROUND

[0002] With the increasing demand for reading quality, the technology of electronic paper display panel has been rapidly developed, and many novel electronic paper display panels have been continuously developed. Compared with ordinary paper reading, electronic paper display panel reading can greatly save ecological resources, and has many advantages such as low power consumption, thinness, long service life, and flexibility.

[0003] However, the current electronic paper display panel realizes the display of the picture by controlling the up-down movement of the electrophoretic particles, which leads to the reduction of the response speed of the entire electronic paper display panel. SUMMARY

[0004] The purpose of the present application is to provide an electronic paper display panel, a driving method thereof and an electronic paper display device to improve the response speed of the electronic paper display panel.

[0005] The present application discloses an electronic paper display panel, which comprises an array substrate, an electrophoretic particle reflection layer and a common electrode layer, the electrophoretic particle reflection layer is arranged on the array substrate, and the common electrode layer is arranged on the side of the electrophoretic particle reflection layer away from the array substrate.

[0006] The electrophoretic particle reflection layer comprises first electrophoretic particles and second electrophoretic particles, the first electrophoretic particles comprise a first light reflection part and a first light absorption part, and the first light reflection part and the first light absorption part are connected; the second electrophoretic particles comprise a second light reflection part and a second light absorption part, and the second light reflection part and the second light absorption part are connected; only the first light reflection part in the first electrophoretic particles has a first polarity, and only the second light absorption part in the second electrophoretic particles has a second polarity.

[0007] Optionally, the shape of the first electrophoretic particles and the shape of the second electrophoretic particles are both ellipsoids.

[0008] Optionally, the electronic paper display panel comprises a plurality of pixel units, the array substrate comprises an active switch layer and a pixel electrode layer, and the pixel electrode layer is arranged on the active switch layer; the pixel electrode layer comprises a plurality of pixel electrode groups, the pixel electrode groups and the pixel units correspond one by one; the pixel electrode group comprises a first sub-pixel electrode part and a second sub-pixel electrode part, and the first sub-pixel electrode part and the second sub-pixel electrode part are used to load different polarity voltage values.

[0009] Optionally, the first sub-pixel electrode portion surrounds the periphery of the second sub-pixel electrode portion.

[0010] Optionally, the electronic paper display panel includes a plurality of pixel units, and the electronic paper display panel further includes a color resist layer, which is disposed on the side of the electrophoretic particle reflective layer away from the array substrate; the color resist layer includes a plurality of sub-color resists, each of the sub-color resists corresponding to each pixel unit.

[0011] Optionally, the first polarity is the negative polarity and the second polarity is the positive polarity.

[0012] Optionally, the first polarity is positive and the second polarity is negative.

[0013] This application also discloses a driving method for an electronic paper display panel. The driving method for the electronic paper display panel is used to drive the electronic paper display panel. The electronic paper display panel includes a plurality of pixel units. The array substrate includes an active switching layer and a pixel electrode layer. The pixel electrode layer is disposed on the active switching layer.

[0014] A pixel electrode driving voltage is loaded into the pixel electrode layer, and a common electrode driving voltage is loaded into the common electrode layer;

[0015] An electric field is formed between the pixel electrode layer and the common electrode layer to control the movement and rotation of the first electrophoretic particle and the second electrophoretic particle.

[0016] Optionally, the pixel electrode layer includes multiple pixel electrode groups, and each pixel electrode group corresponds to a pixel unit; each pixel electrode group includes a first sub-pixel electrode portion and a second sub-pixel electrode portion, the first sub-pixel electrode portion and the second sub-pixel electrode portion being used to load voltage values ​​of different polarities; the first sub-pixel electrode portion surrounds the periphery of the second sub-pixel electrode portion; the first polarity is negative, and the second polarity is positive;

[0017] The steps of loading a pixel electrode driving voltage into the pixel electrode layer and loading a common electrode driving voltage into the common electrode layer include:

[0018] When the current pixel unit displays a first range of gray levels, the common electrode layer is loaded with a first negative voltage, and the first sub-pixel electrode portion is loaded with a second negative voltage;

[0019] The second sub-pixel electrode portion is loaded with a first positive voltage, and the absolute value of the first positive voltage is less than the absolute value of the first negative voltage, while the absolute value of the second negative voltage is greater than the absolute value of the first negative voltage.

[0020] When the current pixel unit displays the second range of gray levels, the common electrode layer is loaded with a first negative voltage, and the second sub-pixel electrode portion is loaded with a first positive voltage;

[0021] The first sub-pixel electrode portion is loaded with a second negative voltage, and the absolute value of the first positive voltage is greater than the absolute value of the first negative voltage, while the absolute value of the second negative voltage is less than the absolute value of the first negative voltage.

[0022] The minimum value within the first grayscale range is greater than the maximum value within the second grayscale range.

[0023] This application also discloses an electronic paper 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 drive the electronic paper display panel to display an image.

[0024] Compared to existing electronic paper display panel solutions, the electronic paper display panel of this application integrates a light-absorbing part and a light-reflecting part onto a single electrophoretic particle. The first electrophoretic particle has only the first light-reflecting part exhibiting a first polarity, while the second electrophoretic particle has only the second light-absorbing part exhibiting a second polarity. An array substrate and a common electrode layer control the rotation of the first and second electrophoretic particles to control the absorption and reflection of light for image display. Controlling the rotation of the first and second electrophoretic particles is faster than controlling the movement of the electrophoretic particles, thereby improving the response speed of the electronic paper display panel. Attached Figure Description

[0025] 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:

[0026] Figure 1 This is a schematic diagram of an electronic paper display device according to an embodiment of this application;

[0027] Figure 2 This is a schematic diagram of an electronic paper display panel according to the first embodiment of this application;

[0028] Figure 3 This is a schematic diagram of a microcapsule according to the first embodiment of this application;

[0029] Figure 4 This is a schematic diagram of a first electrophoretic particle according to the first embodiment of this application;

[0030] Figure 5 This is a schematic diagram of a second electrophoretic particle according to the first embodiment of this application;

[0031] Figure 6 This is a schematic diagram of a first pixel electrode group according to the first embodiment of this application;

[0032] Figure 7 This is a schematic diagram of the second type of pixel electrode group according to the first embodiment of this application;

[0033] Figure 8 This is a schematic diagram of the left-right arrangement of a first sub-pixel electrode portion and a second sub-pixel electrode portion according to a first embodiment of this application;

[0034] Figure 9 This is a schematic diagram of a full-surface first sub-pixel electrode portion and a second sub-pixel electrode portion according to the first embodiment of this application;

[0035] Figure 10 This is a schematic diagram of an array substrate according to a second embodiment of this application;

[0036] Figure 11 This is a schematic diagram of a driving method for an electronic paper display panel according to an embodiment of this application.

[0037] Among them, 10 is an electronic paper display device; 20 is a driving circuit; 30 is an electronic paper display panel; 40 is a pixel unit; 41 is a first pixel unit; 42 is a second pixel unit; 100 is an array substrate; 110 is an active switching layer; 120 is an active switching group; 121 is a first sub-active switch; 122 is a second sub-active switch; 200 is a pixel electrode layer; 210 is a pixel electrode group; 211 is a first sub-pixel electrode portion; 221 is a first surrounding portion; 222 is a second surrounding portion; 223 is a third surrounding portion; 224 is a fourth surrounding portion; 231 is a second sub-pixel electrode portion; 300 is an electrophoretic particle reflective layer; 310 is a first electrophoretic particle; 311 is a first... Light reflecting section; 331, first distal end section; 332, first middle end section; 333, first proximal end section; 312, first light absorbing section; 320, second electrophoretic particle; 321, second light reflecting section; 322, second light absorbing section; 341, second distal end section; 342, second middle end section; 343, second proximal end section; 410, upper membrane; 420, lower membrane; 430, barrier; 440, microcapsule; 450, microcup cavity; 500, common electrode layer; 510, color resist layer; 511, sub-color resist; 611, first data line; 612, second data line; 613, third data line; 621, first scan line; 622, second scan line. Detailed Implementation

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] The present application will now be described in detail with reference to the accompanying drawings and optional embodiments.

[0043] Figure 1 This is a schematic diagram of an electronic paper display device according to an embodiment of this application, as shown below. Figure 1 As shown, this application discloses an electronic paper 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 drive the electronic paper display panel 30 to display an image.

[0044] This application also discloses an electronic paper display panel 30, which can be used in the electronic paper display device 10 described above. Regarding the electronic paper display panel 30, this application provides the following design:

[0045] Figure 2 This is a schematic diagram of an electronic paper display panel according to the first embodiment of this application. Figure 3 This is a schematic diagram of a microcapsule according to the first embodiment of this application, as shown below. Figures 2-3 As shown, this application discloses an electronic paper display panel 30, which includes an array substrate 100, an electrophoretic particle reflective layer 300, and a common electrode layer 500. The electrophoretic particle reflective layer 300 is disposed on the array substrate 100, and the common electrode layer 500 is disposed on the side of the electrophoretic particle reflective layer 300 facing away from the array substrate 100.

[0046] The electrophoretic particle reflective layer 300 includes a first electrophoretic particle 310 and a second electrophoretic particle 320. The first electrophoretic particle 310 includes a first light reflecting part 311 and a first light absorbing part 312, which are connected. The second electrophoretic particle 320 includes a second light reflecting part 321 and a second light absorbing part 322, which are connected. In the first electrophoretic particle 310, only the first light reflecting part 311 has a first polarity, and in the second electrophoretic particle 320, only the second light absorbing part 322 has a second polarity.

[0047] For example, the electrophoretic particle reflective layer 300 may adopt a microcup-shaped structure or a microcapsule 440-shaped structure depending on the electronic paper display panel 30.

[0048] See Figure 2 The electrophoretic particle reflective layer 300 has a microcup structure. The electrophoretic particle reflective layer 300 includes an upper membrane 410, a lower membrane 420, and a baffle 430. The baffle 430 is disposed between the upper membrane 410 and the lower membrane 420 and forms a plurality of microcup cavities 450. The first electrophoretic particle 310 and the second electrophoretic particle 320 are located in the microcup cavity 450.

[0049] See Figure 3 The electrophoretic particle reflective layer 300 has a microcapsule 440 structure. The electrophoretic particle reflective layer 300 includes an upper membrane 410, a lower membrane 420 and a microcapsule 440. The microcapsule 440 is disposed between the upper membrane 410 and the lower membrane 420. The first electrophoretic particle 310 and the second electrophoretic particle 320 are located inside the microcapsule 440.

[0050] Currently, electrophoretic particles are mainly divided into white electrophoretic particles and black electrophoretic particles, and the polarities of white electrophoretic particles and black electrophoretic particles are opposite. When it is necessary to control the reflection of light by pixel unit 40, the white electrophoretic particles are controlled to move upward and the black electrophoretic particles are controlled to move downward. When it is necessary to control the absorption of light by pixel unit 40, the white electrophoretic particles are controlled to move downward and the black electrophoretic particles are controlled to move upward. However, the movement speed of electrophoretic particles is relatively slow, especially in low temperature environments, which leads to a decrease in the response speed of the entire electronic paper display panel 30.

[0051] Compared to existing electronic paper display panel solutions, the electronic paper display panel 30 of this application integrates a light-absorbing portion and a light-reflecting portion onto a single electrophoretic particle. The first electrophoretic particle 310 has only the first light-reflecting portion 311 exhibiting a first polarity, while the second electrophoretic particle 320 has only the second light-absorbing portion 322 exhibiting a second polarity. The array substrate 100 and the common electrode layer 500 control the rotation of the first electrophoretic particle 310 and the second electrophoretic particle 320 to achieve controlled light absorption and reflection for image display. Controlling the rotation of the first electrophoretic particle 310 and the second electrophoretic particle 320 is faster than controlling the movement of the electrophoretic particles, thereby improving the response speed of the electronic paper display panel 30.

[0052] For example, the first polarity is negative and the second polarity is positive. Simply put, the first light-reflecting part 311 in the first electrophoretic particle 310 is negative, and the second light-reflecting part 321 in the second electrophoretic particle 320 is positive. In this way, when a black screen needs to be displayed, the array substrate 100 can be made positive, thereby driving the second electrophoretic particle 320 to move upward and driving the first electrophoretic particle 310 to move downward. At this time, the second light-absorbing part 322 and the first light-absorbing part 312 face upward, and the first light-reflecting part 311 and the second light-reflecting part 321 face downward.

[0053] When a white image needs to be displayed, the array substrate 100 can be made negative, thereby driving the second electrophoretic particle 320 to move downward and the first electrophoretic particle 310 to move upward. At this time, the second light reflecting part 321 and the first light reflecting part 311 face upward, while the first light absorbing part 312 and the second light absorbing part 322 face downward.

[0054] Of course, it is also possible for the first polarity to be positive and the second polarity to be negative. This is not a limitation; the accompanying drawings of this application use an example of the first polarity being negative and the second polarity being positive for explanation and illustration.

[0055] To achieve color display on the electronic paper display panel 30, this application also includes a color resist layer 510. Specifically, the electronic paper display panel 30 includes multiple pixel units 40, and the color resist layer 510 is disposed on the side of the electrophoretic particle reflective layer 300 facing away from the array substrate 100. The color resist layer 510 includes multiple sub-color resists 511, each sub-color resist 511 corresponding to each pixel unit 40. The multiple sub-color resists 511 include red, green, and blue color resists, thus achieving a color display effect on the electronic paper display panel 30 through filtering by the sub-color resists 511.

[0056] Figure 4 This is a schematic diagram of a first electrophoretic particle according to the first embodiment of this application. Figure 5 This is a schematic diagram of a second electrophoretic particle according to the first embodiment of this application, as shown below. Figures 4-5 As shown, the first electrophoretic particle 310 and the second electrophoretic particle 320 are both ellipsoids.

[0057] In order to further increase the rotational speed of the first electrophoretic particle 310 and the second electrophoretic particle 320, thereby improving the response speed of the electronic paper display panel 30, this application sets the shape of the first electrophoretic particle 310 and the shape of the second electrophoretic particle 320 to be ellipsoids.

[0058] For example, the aspect ratio of the first electrophoretic particle 310 and the second electrophoretic particle 320 is 3:2-3:1. Thus, when the first electrophoretic particle 310 and the second electrophoretic particle 320 are subjected to the electric field force between the array substrate 100 and the common electrode layer 500, the direction of the electric field force will be applied to the long axis direction of the first electrophoretic particle 310 and the second electrophoretic particle 320, thereby enabling the first electrophoretic particle 310 and the second electrophoretic particle 320 to obtain a larger effective torque, thereby increasing the rotational speed of the first electrophoretic particle 310 and the second electrophoretic particle 320.

[0059] Furthermore, since traditional electronic paper display panels 30 all use electrophoretic particles that are fully positively and negatively charged, when voltage is applied to the pixel electrode layer 200 and the common electrode layer 500, the electrophoretic particles move to the edge of the common electrode layer 500 under the action of the electric field before they can reflect light to achieve display. The electrophoretic particles need a certain amount of time to move, which results in a relatively slow response speed.

[0060] In this invention, the electrophoretic particles are configured as ellipsoids that are half charged and half uncharged. Specifically, in the first electrophoretic particle 310, only the first light-reflecting part 311 exhibits the first polarity, and in the second electrophoretic particle 320, only the second light-absorbing part 322 exhibits the second polarity.

[0061] Compared to spherical electrophoretic particles, ellipsoidal electrophoretic particles have a semi-ellipsoidal charged part, which has a larger torque along the major axis of the ellipsoid. Under the action of the electric field, they can rotate faster, which can greatly improve the response speed of electronic paper.

[0062] Furthermore, the advantage of this configuration is that when voltage is applied to the pixel electrode layer 200 and the common electrode layer 500, the first electrophoretic particle 310 and the second electrophoretic particle 320 can quickly rotate to the desired display surface while rising. Therefore, even if the first electrophoretic particle 310 and the second electrophoretic particle 320 do not rise to the side close to the display surface, the required image can still be displayed normally without affecting the display of the electronic paper display panel 30, thus greatly improving the display responsiveness.

[0063] Secondly, the advantage of having both the first electrophoretic particle 310 and the second electrophoretic particle 320 in the shape of ellipsoids is that they have a larger area of ​​force application in the electric field and more uniform force application, which reduces the movement delay caused by uneven local force application and further optimizes the display effect.

[0064] Furthermore, the first spherical electrophoretic particle makes point contact with other spherical electrophoretic particles, resulting in high pressure per unit area and a tendency to "get stuck" due to van der Waals forces or electrostatic adsorption. In contrast, both the first electrophoretic particle 310 and the second electrophoretic particle 320 are ellipsoids, which align in an electric field (with their major axes parallel to the field direction). This means that during movement, the contact surface is at the end of the major axis, resulting in a contact area much smaller than that of the spherical electrophoretic particles. This significantly reduces static friction, making it easier for the particles to move out of their stationary state.

[0065] Secondly, according to Stokes' drag formula: Fd = 6πηrv, where r is the equivalent radius. The shape of the ellipsoidal first electrophoretic particle 310 and the projected cross-sectional area of ​​the second electrophoretic particle 320 in the direction of motion are smaller than those of a sphere of the same volume. When the major axis is parallel to the direction of motion, the frontal area is minimized, thus reducing fluid resistance.

[0066] The third spherical electrophoretic particles are prone to agglomeration due to van der Waals forces or uneven charge, and the agglomerates increase drag. The ellipsoidal shape of the first electrophoretic particle 310 and the second electrophoretic particle 320, due to their anisotropic shapes, make it difficult for them to pack tightly, reducing the probability of agglomeration.

[0067] Therefore, the design of both the first electrophoretic particle 310 and the second electrophoretic particle 320 as ellipsoids reduces the frictional resistance between particles, making their movement in the electric field smoother, thereby further shortening the response time.

[0068] Meanwhile, both the first electrophoretic particle 310 and the second electrophoretic particle 320 are elliptical in shape. In the first electrophoretic particle 310, only the first light reflecting part 311 has the first polarity, and in the second electrophoretic particle 320, only the second light absorbing part 322 has the second polarity. The arrangement on the side closer to the display surface is more compact, which improves the light reflection efficiency and makes the display picture clearer and brighter. Its design can also effectively reduce energy consumption and extend the service life of the electronic paper display panel 30.

[0069] Furthermore, elliptic electrophoretic particles experience a dielectric torque in an electric field, causing their long axis to automatically align with the electric field direction. Thus, when the electric field direction changes, the particles quickly adjust their orientation by rotating, maintaining their long axis parallel to the new electric field. The particle's motion direction is always consistent with the electric field direction, resulting in a straight line or smooth curve trajectory with predictable path height. In contrast, spherical electrophoretic particles are non-directional, rotating randomly in the electric field. Their motion direction deviates from the electric field direction, causing their paths to appear "zigzag" or "diffuse," with delayed response and low positional accuracy.

[0070] Therefore, the elliptical shape of both the first electrophoretic particle 310 and the second electrophoretic particle 320 makes their motion trajectory in the electric field more controllable, reduces randomness, and makes the display panel more accurate in complex image processing.

[0071] Furthermore, traditional spherical electrophoresis particles exhibit disordered motion trajectories (random rotation, agglomeration), thus requiring a larger electrode spacing to prevent particles from getting stuck or deviating. In contrast, ellipsoidal electrophoresis particles exhibit precise directional motion trajectories (parallel electric field along the long axis), reducing the fault tolerance requirements between electrodes and eliminating the need for such a large electrode spacing.

[0072] Therefore, the elliptical shape of both the first electrophoretic particle 310 and the second electrophoretic particle 320 effectively reduces the thickness of the electronic paper display panel 30, improving the portability of the device. Its fast response characteristics enable the electronic paper display panel 30 to perform better in various application scenarios, especially maintaining a clear and visible display effect in strong outdoor light environments.

[0073] The first light-reflecting part 311 of the first electrophoretic particle 310 is negatively polarized by attaching a negatively polarized material to the surface of the first light-reflecting part 311. In the second electrophoretic particle 320, only the second light-absorbing part 322 is positively polarized by attaching a positively polarized material to the surface of the second light-absorbing part 322.

[0074] The first light-reflecting portion 311 is divided into a first distal end portion 331, a first middle end portion 332, and a first proximal end portion 333. The first distal end portion 331 and the first proximal end portion 333 are located on both sides of the first middle end portion 332, and the first distal end portion 331 is located on the side of the first middle end portion 332 away from the first light-absorbing portion 312. The first proximal end portion 333 is located between the first middle end portion 332 and the first light-absorbing portion 312. The negative polarity material is only attached to the first distal end portion 331.

[0075] The second light-absorbing portion 322 is divided into a second distal end portion 341, a second middle end portion 342, and a second proximal end portion 343. The second distal end portion 341 and the second proximal end portion 343 are located on both sides of the second middle end portion 342, and the second distal end portion 341 is located on the side of the second middle end portion 342 away from the second light-reflecting portion 321. The second proximal end portion 343 is located between the second middle end portion 342 and the second light-reflecting portion 321. The positive polarity material is only attached to the second distal end portion 341.

[0076] In simple terms, the first distal end 331 of the first light reflecting part 311 is made negative, and the second distal end 341 of the second light absorbing part 322 is made positive. In this way, under the action of the electric field force, the first electrophoretic particle 310 and the second electrophoretic particle 320 can generate a larger effective torque, thereby further increasing the rotation speed.

[0077] For example, the method for preparing the first electrophoretic particle 310 can be to use an anodic aluminum oxide (AAO) elliptical hole template, fill the template by electrodeposition or sol-gel, and obtain elliptical particles after dissolving the template. Then, a masking step-by-step coloring method can be used to fix the elliptical particles on the substrate, cover half of the particle surface with a photoresist or PDMS (polydimethylsiloxane) mask, and coat the unmasked side with a white material (such as TiO2) by physical vapor deposition (PVD) or sol-gel method to prepare the first light-reflecting part 311. After removing the mask, cover the white-coated area, and coat the other side with a black material (such as carbon black or Fe3O4) to prepare the first light-absorbing part 312.

[0078] Then, a PDMS film is used to cover the first light-absorbing part 312. The surface of the first light-reflecting part 311 is activated by plasma treatment to generate Si-OH groups. It is then immersed in a 3-(trimethoxysilyl)propyl acrylate (TMSPA) ethanol solution (2% v / v, 60°C, 2 h) to graft carboxyl groups (-COOH), making it negatively charged. Then, a PDMS film is used to cover the first light-reflecting part 311. Polymethyl methacrylate (PMMA) or a fluorinated polymer (such as PTFE) is spin-coated onto the first light-absorbing part 312 to form an insulating layer, thereby forming the first electrophoretic particles 310.

[0079] An exemplary method for preparing the second electrophoretic particle 320 is as follows: using an anodic aluminum oxide (AAO) elliptical hole template, the template is filled by electrodeposition or sol-gel method, and elliptical particles are obtained after dissolving the template. Then, a masking step-by-step coloring method can be used to fix the elliptical particles on a substrate, cover half of the particle surface with a photoresist or PDMS (polydimethylsiloxane) mask, and coat the unmasked side with a white material (such as TiO2) by physical vapor deposition (PVD) or sol-gel method to prepare the second light-reflecting part 321. After removing the mask, the white-coated area is covered, and a black material (such as carbon black or Fe3O4) is coated on the other side to prepare the second light-absorbing part 322.

[0080] Then, a PDMS film is used to cover the second light-reflecting part 321, and the surface of the second light-absorbing part 322 is activated by plasma treatment. The second light-absorbing part 322 is then immersed in an ethanol solution of 3-aminopropyltriethoxysilane (APTES) to graft amino groups (-NH2) onto its surface, making it positively charged. The second light-absorbing part 322 is then covered with a PDMS film, and polymethyl methacrylate (PMMA) or a fluorinated polymer (such as PTFE) is spin-coated onto the second light-reflecting part 321 to form an insulating layer, thereby forming the second electrophoretic particles 320.

[0081] Figure 6 This is a schematic diagram of the first pixel electrode group according to the first embodiment of this application. Figure 7 This is a schematic diagram of the second type of pixel electrode group according to the first embodiment of this application, combined with Figures 2-7 As shown, the electronic paper display panel 30 includes a plurality of pixel units 40, and the array substrate 100 includes an active switching layer 110 and a pixel electrode layer 200. The pixel electrode layer 200 is disposed on the active switching layer 110. The pixel electrode layer 200 includes a plurality of pixel electrode groups 210, and the pixel electrode groups 210 correspond one-to-one with the pixel units 40. The pixel electrode group 210 includes a first sub-pixel electrode portion 211 and a second sub-pixel electrode portion 231, and the first sub-pixel electrode portion 211 and the second sub-pixel electrode portion 231 are used to load voltage values ​​of different polarities.

[0082] One of the first sub-pixel electrode portion 211 and the second sub-pixel electrode portion 231 is used to control the rotation and movement of the first electrophoretic particle 310 and the second electrophoretic particle 320, and the other is used to control the deflection of the first electrophoretic particle 310 and the second electrophoretic particle 320, so as to achieve grayscale control.

[0083] The active switch layer 110 includes a plurality of active switch groups 120, each active switch group 120 including a first sub-active switch 121 and a second sub-active switch 122. The first sub-active switch 121 is connected to the first sub-pixel electrode portion 211, and the second sub-active switch 122 is connected to the second sub-pixel electrode portion 231.

[0084] The pixel electrode group 210, the active switch group 120, and the pixel unit 40 correspond one-to-one; in other words, a pixel unit 40 is provided with a pixel electrode group 210 and an active switch group 120.

[0085] See Figure 6 As shown, the electronic paper display panel 30 includes a first data line 611, a second data line 612, a first scan line 621, and a second scan line 622. The first scan line 621 is connected to the gate of the first sub-active switch 121, and the second scan line 622 is connected to the gate of the second sub-active switch 122. The first data line 611 is connected to the source of the first sub-active switch 121, and the second data line 612 is connected to the source of the second sub-active switch 122. In simple terms, the first sub-pixel electrode 211 and the second sub-pixel electrode 231 are charged through two data lines, namely the first data line 611 and the second data line 612.

[0086] See Figure 7 As shown, the electronic paper display panel 30 includes a third data line 613, a first scan line 621, and a second scan line 622. The first scan line 621 is connected to the gate of the first sub-active switch 121, and the second scan line 622 is connected to the gate of the second sub-active switch 122. The third data line 613 is connected to both the source and the source of the first sub-active switch 121 and the second sub-active switch 122. By controlling the first scan line 621 and the second scan line 622 to control the on / off state of the first sub-active switch 121 and the second sub-active switch 122, the first sub-pixel electrode 211 or the second sub-pixel electrode 231 can be charged sequentially. In simple terms, the first sub-pixel electrode 211 and the second sub-pixel electrode 231 are charged in a time-division manner through a single data line, the third data line 613, which can reduce the number of metal lines in the electronic paper display panel 30.

[0087] The first sub-pixel electrode portion 211 and the second sub-pixel electrode portion 231 can be distributed horizontally or vertically. That is, the first sub-pixel electrode portion 211 and the second sub-pixel electrode portion 231 in each pixel unit 40 are both distributed horizontally, or the first sub-pixel electrode portion 211 and the second sub-pixel electrode portion 231 in each pixel unit 40 are both distributed vertically. This makes the distribution of pixel units 40 more uniform and easier to manufacture. For example, the first sub-pixel electrode portion 211 and the second sub-pixel electrode portion 231 have the same shape and equal area.

[0088] Figure 8 This is a schematic diagram of the left-right arrangement of the first sub-pixel electrode portion and the second sub-pixel electrode portion according to the first embodiment of this application. See also Figure 8 As shown, when the first sub-pixel electrode portion 211 and the second sub-pixel electrode portion 231 of the entire pixel unit 40 are arranged horizontally or vertically, bright and dark stripes appear when displaying images of the same grayscale in certain areas. This is because the deflection directions of the first electrophoretic particles 310 and the second electrophoretic particles 320 within each pixel unit 40 are consistent, and the angle of deflection of the first electrophoretic particles 310 and the second electrophoretic particles 320 decreases the further away from the pixel electrode controlling the deflection of the first electrophoretic particles 310 and the second electrophoretic particles 320. This results in... Figure 8 The grayscale of pixel unit 40 changes from left to right.

[0089] Figure 9 This is a schematic diagram of a first sub-pixel electrode portion and a second sub-pixel electrode portion covering an entire surface, according to the first embodiment of this application. Figure 9 As shown, to avoid the problem of bright and dark stripes appearing when the electronic paper display panel 30 displays a completely black or completely white image in some areas, this application further improves the first sub-pixel electrode 211 and the second sub-pixel electrode 231, specifically:

[0090] The extension direction of the first scan line 621 is defined as the first direction, the direction perpendicular to the first direction is defined as the second direction, and two adjacent pixel units 40 are defined as the first pixel unit 41 and the second pixel unit 42.

[0091] In the first pixel unit 41, the second sub-pixel electrode portion 231 is located on one side of the first sub-pixel electrode portion 211 along a first direction; in the second pixel unit 42, the second sub-pixel electrode portion 231 is located on one side of the first sub-pixel electrode portion 211 along a second direction.

[0092] In simple terms, the first sub-pixel electrode portion 211 and the second sub-pixel electrode portion 231 within the first pixel unit 41 are arranged horizontally, while the first sub-pixel electrode portion 211 and the second sub-pixel electrode portion 231 within the second pixel unit 42 are arranged vertically. This avoids the first and second sub-electrophoretic particles within each pixel unit 40 having the same deflection direction in areas displaying the same grayscale; thus avoiding the problem of bright and dark stripes appearing when the electronic paper display panel 30 displays a completely black or completely white image in some areas.

[0093] Example 2:

[0094] Figure 10 This is a schematic diagram of an array substrate according to a second embodiment of this application, as shown below. Figure 10 As shown, unlike the first embodiment, the first sub-pixel electrode portion 211 surrounds the periphery of the second sub-pixel electrode portion 231.

[0095] The first sub-pixel electrode portion 211 includes a first surrounding portion 221, a second surrounding portion 222, a third surrounding portion 223, and a fourth surrounding portion 224. The first surrounding portion 221, the second surrounding portion 222, the third surrounding portion 223, and the fourth surrounding portion 224 are connected in sequence. The first surrounding portion 221 and the third surrounding portion 223 are located on both sides of the second pixel electrode along a first direction, and the second surrounding portion 222 and the fourth surrounding portion 224 are located on both sides of the second pixel electrode along a second direction.

[0096] For example, the first surrounding portion 221, the second surrounding portion 222, the third surrounding portion 223 and the fourth surrounding portion 224 have the same shape and the same area, which makes it convenient to control the grayscale of the pixel unit 40 according to the voltage.

[0097] The minimum value within the first grayscale range is greater than the maximum value within the second grayscale range. Taking a grayscale range of 0-255 as an example, the first grayscale range can be 127-255, and the second grayscale range can be 0-126.

[0098] Furthermore, during control, when the current pixel unit 40 displays a first range of gray levels, the common electrode layer 500 is loaded with a first negative voltage, and the first sub-pixel electrode portion 211 is loaded with a second negative voltage.

[0099] The second sub-pixel electrode portion 231 is loaded with a first positive voltage, and the absolute value of the first positive voltage is less than the absolute value of the first negative voltage, while the absolute value of the second negative voltage is greater than the absolute value of the first negative voltage.

[0100] When the current pixel unit 40 displays a high grayscale image, a second negative voltage can be applied to the first sub-pixel electrode 211 to control the first light reflecting part 311 of the first electrophoretic particle 310 to rotate upward and move the first electrophoretic particle 310 upward; and the second light absorbing part 322 of the second electrophoretic particle 320 to rotate downward and move the second electrophoretic particle downward; then, by applying a first positive voltage to the second sub-pixel electrode 231, the first electrophoretic particle 310 and the second electrophoretic particle 320 are deflected to achieve grayscale display. At this time, within the pixel unit 40, the color diffuses from the center to the surrounding area, presenting a change from white to gray, thereby avoiding the problem of color mixing between adjacent pixel units 40 when achieving grayscale display.

[0101] When the current pixel unit 40 displays the second range of gray levels, the common electrode layer 500 is loaded with a first negative voltage, and the second sub-pixel electrode portion 231 is loaded with a first positive voltage.

[0102] The first sub-pixel electrode portion 211 is loaded with a second negative voltage, and the absolute value of the first positive voltage is greater than the absolute value of the first negative voltage, while the absolute value of the second negative voltage is less than the absolute value of the first negative voltage.

[0103] When the current pixel unit 40 displays a low grayscale image, a first positive voltage can be applied to the second sub-pixel electrode 231 to control the second light absorption part 322 of the second electrophoretic particle 320 to rotate upward and control the second electrophoretic particle 320 to move upward; and to control the first light reflection part 311 of the first electrophoretic particle 310 to rotate downward and control the first electrophoretic particle to move downward.

[0104] Then, by applying a second negative voltage to the first sub-pixel electrode 211, the first electrophoretic particle 310 and the second electrophoretic particle 320 are deflected to achieve grayscale display. At this time, within the pixel unit 40, the color diffuses from the center to the surrounding area, showing a change from gray to black. This avoids the problem of color mixing between adjacent pixel units 40 when achieving grayscale display.

[0105] In simple terms, the grayscale level is reduced from the center to the periphery within each pixel electrode, which is equivalent to forming a black matrix effect within two adjacent pixel units 40, thus avoiding color mixing problems.

[0106] Figure 11 This is a schematic diagram of a driving method for an electronic paper display panel according to an embodiment of this application, as shown below. Figure 11As shown, this application also discloses a driving method for an electronic paper display panel 30. The driving method for the electronic paper display panel 30 is used to drive the electronic paper display panel 30. The electronic paper display panel 30 includes a plurality of pixel units 40. The array substrate 100 includes an active switching layer 110 and a pixel electrode layer 200. The pixel electrode layer 200 is disposed on the active switching layer 110.

[0107] S1: Load a pixel electrode driving voltage into the pixel electrode layer and load a common electrode driving voltage into the common electrode layer;

[0108] S2: An electric field is formed between the pixel electrode layer and the common electrode layer to control the movement and rotation of the first electrophoretic particle and the second electrophoretic particle.

[0109] Compared to existing electronic paper display panel solutions, the electronic paper display panel 30 of this application integrates the light absorption part and the light reflection part onto a single electrophoretic particle. Then, by controlling the rotation of the first electrophoretic particle 310 and the second electrophoretic particle 320—where only the first light reflection part 311 of the first electrophoretic particle 310 exhibits a first polarity and only the second light absorption part 322 of the second electrophoretic particle 320 exhibits a second polarity—the array substrate 100 and the common electrode layer 500 control the absorption and reflection of light to display the image. Controlling the rotation of the first electrophoretic particle 310 and the second electrophoretic particle 320 is faster than controlling the movement of the electrophoretic particles, thereby improving the response speed.

[0110] To further enhance the display effect, the pixel electrode layer 200 includes multiple pixel electrode groups 210, each corresponding to a pixel unit 40. Each pixel electrode group 210 includes a first sub-pixel electrode portion 211 and a second sub-pixel electrode portion 231, which are used to load voltage values ​​of different polarities. The first sub-pixel electrode portion 211 surrounds the second sub-pixel electrode portion 231. The first polarity is negative, and the second polarity is positive.

[0111] S1: The steps of loading a pixel electrode driving voltage into the pixel electrode layer and loading a common electrode driving voltage into the common electrode layer include:

[0112] S11: When the current pixel unit displays a first range of gray levels, the common electrode layer is loaded with a first negative voltage, and the first sub-pixel electrode portion is loaded with a second negative voltage;

[0113] S12: The second sub-pixel electrode portion is loaded with a first positive voltage, and the absolute value of the first positive voltage is less than the absolute value of the first negative voltage, while the absolute value of the second negative voltage is greater than the absolute value of the first negative voltage.

[0114] S13: When the current pixel unit displays the second range of gray levels, the common electrode layer is loaded with a first negative voltage, and the second sub-pixel electrode portion is loaded with a first positive voltage;

[0115] S14: The first sub-pixel electrode portion is loaded with a second negative voltage, and the absolute value of the first positive voltage is greater than the absolute value of the first negative voltage, while the absolute value of the second negative voltage is less than the absolute value of the first negative voltage.

[0116] The minimum value within the first grayscale range is greater than the maximum value within the second grayscale range.

[0117] When the current pixel unit 40 displays a high grayscale image, a second negative voltage can be applied to the first sub-pixel electrode 211 to control the first light reflecting part 311 of the first electrophoretic particle 310 to rotate upward and move the first electrophoretic particle 310 upward; and the second light absorbing part 322 of the second electrophoretic particle 320 to rotate downward and move the second electrophoretic particle downward; then, by applying a first positive voltage to the second sub-pixel electrode 231, the first electrophoretic particle 310 and the second electrophoretic particle 320 are deflected to achieve grayscale display. At this time, within the pixel unit 40, the color diffuses from the center to the surrounding area, presenting a change from white to gray, thereby avoiding the problem of color mixing between adjacent pixel units 40 when achieving grayscale display.

[0118] When the current pixel unit 40 displays a low grayscale image, a first positive voltage can be applied to the second sub-pixel electrode 231 to control the second light absorption part 322 of the second electrophoretic particle 320 to rotate upward and control the second electrophoretic particle 320 to move upward; and to control the first light reflection part 311 of the first electrophoretic particle 310 to rotate downward and control the first electrophoretic particle to move downward.

[0119] Then, by applying a second negative voltage to the first sub-pixel electrode 211, the first electrophoretic particle 310 and the second electrophoretic particle 320 are deflected to achieve grayscale display. At this time, within the pixel unit 40, the color diffuses from the center to the surrounding area, showing a change from gray to black. This avoids the problem of color mixing between adjacent pixel units 40 when achieving grayscale display.

[0120] In simple terms, the grayscale level is reduced from the center to the periphery within each pixel electrode, which is equivalent to forming a black matrix effect within two adjacent pixel units 40, thus avoiding color mixing problems.

[0121] 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.

[0122] 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.

[0123] 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 comprises an array substrate, an electrophoretic particle reflection layer and a common electrode layer, the electrophoretic particle reflection layer is arranged on the array substrate, and the common electrode layer is arranged on the side of the electrophoretic particle reflection layer away from the array substrate; The electrophoretic particle reflection layer comprises first electrophoretic particles and second electrophoretic particles, the first electrophoretic particles comprise a first light reflection part and a first light absorption part, and the first light reflection part and the first light absorption part are connected; the second electrophoretic particles comprise a second light reflection part and a second light absorption part, and the second light reflection part and the second light absorption part are connected; only the first light reflection part in the first electrophoretic particles has a first polarity, and only the second light absorption part in the second electrophoretic particles has a second polarity; When a black picture needs to be displayed, the second electrophoretic particles are driven to move upward, and the first electrophoretic particles are driven to move downward; when a white picture needs to be displayed, the second electrophoretic particles are driven to move downward, and the first electrophoretic particles are driven to move upward.

2. The electronic paper display panel of claim 1, wherein, The shape of the first electrophoretic particles and the shape of the second electrophoretic particles are both ellipsoids.

3. The electronic paper display panel according to any one of claims 1 and 2, characterized by, The electronic paper display panel comprises a plurality of pixel units, the array substrate comprises an active switch layer and a pixel electrode layer, the pixel electrode layer is arranged on the active switch layer; the pixel electrode layer comprises a plurality of pixel electrode groups, the pixel electrode groups and the pixel units correspond one by one; the pixel electrode group comprises a first sub-pixel electrode part and a second sub-pixel electrode part, and the first sub-pixel electrode part and the second sub-pixel electrode part are used to load voltage values of different polarities.

4. The electronic paper display panel of claim 3, wherein, The first sub-pixel electrode part surrounds the periphery of the second sub-pixel electrode part.

5. The electronic paper display panel of claim 1, wherein, The electronic paper display panel comprises a plurality of pixel units, and further comprises a color resistance layer, the color resistance layer is arranged on the side of the electrophoretic particle reflection layer away from the array substrate; the color resistance layer comprises a plurality of sub-color resistances, and each sub-color resistance corresponds to each pixel unit one by one.

6. The electronic paper display panel of claim 1, wherein, The first polarity is negative, and the second polarity is positive.

7. The electronic paper display panel of claim 1, wherein, The first polarity is positive, and the second polarity is negative. 8.A method for driving an electronic paper display panel, characterized by, The driving method of the electronic paper display panel is used for driving the electronic paper display panel as claimed in any one of claims 1-7, the electronic paper display panel comprises a plurality of pixel units, the array substrate comprises an active switch layer and a pixel electrode layer, and the pixel electrode layer is arranged on the active switch layer; Pixel electrode driving voltage is loaded into the pixel electrode layer, and common electrode driving voltage is loaded into the common electrode layer; An electric field is formed between the pixel electrode layer and the common electrode layer, and the first electrophoretic particles and the second electrophoretic particles are controlled to move and rotate. 9.The driving method of the electronic paper display panel according to claim 8, characterized in that, The pixel electrode layer comprises a plurality of pixel electrode groups, the pixel electrode groups and the pixel units correspond one by one; the pixel electrode group comprises a first sub-pixel electrode part and a second sub-pixel electrode part, and the first sub-pixel electrode part and the second sub-pixel electrode part are used to load voltage values of different polarities; and the first sub-pixel electrode part surrounds the periphery of the second sub-pixel electrode part. The first polarity is negative, and the second polarity is positive; The step of loading the pixel electrode driving voltage into the pixel electrode layer and loading the common electrode driving voltage into the common electrode layer comprises: When the current pixel unit displays a first range of gray scales, the common electrode layer is loaded with a first negative voltage, and the first sub-pixel electrode part is loaded with a second negative voltage; The second sub-pixel electrode part is loaded with a first positive voltage, and the absolute value of the first positive voltage is smaller than the absolute value of the first negative voltage, and the absolute value of the second negative voltage is greater than the absolute value of the first negative voltage; When the current pixel unit displays a second range of gray scales, the common electrode layer is loaded with a first negative voltage, and the second sub-pixel electrode part is loaded with a first positive voltage; The first sub-pixel electrode part is loaded with a second negative voltage, and the absolute value of the first positive voltage is greater than the absolute value of the first negative voltage, and the absolute value of the second negative voltage is smaller than the absolute value of the first negative voltage; The minimum value in the first range of gray scales is greater than the maximum value in the second range of gray scales.

10. An electronic paper display device, characterized by comprising: The electronic paper display device comprises a driving circuit and the electronic paper display panel as claimed in any one of claims 1-7, the driving circuit is connected with the electronic paper display panel, and is used for driving the electronic paper display panel to display a picture.

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