Electronic paper display panel, preparation method thereof and display device

Abstract

The application discloses an electronic paper display panel, a preparation method thereof and a display device, and mainly relates to the technical field of display. The electronic paper display panel comprises an array substrate, a light utilization layer, an electrophoretic reflection layer and a counter substrate, the light utilization layer and the electrophoretic reflection layer are located between the array substrate and the counter substrate; the array substrate comprises a first substrate, an active switch layer, a plurality of pixel electrodes and a plurality of color resistors, the active switch layer, the pixel electrodes and the color resistors are sequentially arranged on the first substrate, there is an electrode gap between two adjacent pixel electrodes, the light utilization layer is located at the electrode gap, and the light utilization layer defines a plurality of pixel unit regions, the pixel electrodes, the color resistors and the pixel unit regions correspond to each other in one-to-one correspondence; the light utilization layer is used for reflecting light irradiated onto the light utilization layer from the side of the counter substrate to the direction of adjacent color resistors, and through the above design, the display brightness, contrast and color performance of the electronic paper display panel are improved.

Description

Technical Field

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

[0002] With the continuous development of technology, electronic digital products are being updated and replaced at an increasingly rapid pace, and various new products are constantly being developed. Electronic paper display panels are a new type of display device, mainly used in devices such as electronic tags, billboards, and e-readers. The display effect of this electronic paper display panel is close to that of natural paper, which can reduce eye strain during reading.

[0003] For electronic paper display panels where the array substrate is located on the light-emitting side of the electronic paper display panel, although the movement of electrophoretic particles can be controlled better, it will cause the light transmittance in each pixel unit area of ​​the electronic paper display panel to decrease, thereby causing the display brightness of the electronic paper display panel to decrease. Summary of the Invention

[0004] The purpose of this application is to provide an electronic paper display panel, its manufacturing method, and a display device, which improves the display brightness, contrast, and color performance of the electronic paper display panel.

[0005] This application discloses an electronic paper display panel, which includes an array substrate, a light utilization layer, an electrophoretic reflective layer, and a counter substrate, wherein the light utilization layer and the electrophoretic reflective layer are located between the array substrate and the counter substrate.

[0006] The array substrate includes a first substrate, an active switching layer, multiple pixel electrodes, and multiple color resists. The active switching layer, the pixel electrodes, and the color resists are sequentially disposed on the first substrate. There are electrode gaps between two adjacent pixel electrodes. The light utilization layer is located at the electrode gaps and defines multiple pixel unit regions. The pixel electrodes, the color resists, and the pixel unit regions correspond one-to-one.

[0007] The light-utilizing layer is used to reflect light rays that are incident on the light-utilizing layer from the opposite substrate side toward the adjacent color resist.

[0008] Optionally, the light-utilizing layer includes a partition wall, a receiving groove, and white electrophoretic particles. One end of the partition wall abuts against the opposing substrate, and the other end abuts against the array substrate, and is located between two adjacent color resists. The receiving groove is located at the end of the partition wall away from the opposing substrate, and the white electrophoretic particles are located in the receiving groove.

[0009] The receiving groove includes a first inclined wall and a second inclined wall, both of which are inclined and face the two adjacent color resists respectively.

[0010] Optionally, two adjacent pixel unit regions can be defined as the first pixel unit region and the second pixel unit region;

[0011] The light utilization layer further includes a first electrode, a second electrode, and black electrophoretic particles. The black electrophoretic particles are located in the receiving tank. The first electrode is located on the first inclined wall, and the second electrode is located on the second inclined wall. The first electrode is located on the side of the second electrode close to the first pixel unit region, and the second electrode is located on the side of the first electrode close to the second pixel unit region. The first electrode is connected to the pixel electrode in the first pixel unit region, and the second electrode is connected to the pixel electrode in the second pixel unit region.

[0012] Optionally, the pixel electrode in the first pixel unit region is defined as the first pixel electrode, and the pixel electrode in the second pixel unit region is defined as the second pixel electrode;

[0013] The light utilization layer further includes a first electrode connection section and a second electrode connection section. There is a first stepped surface between the first inclined wall and the outer wall of the partition wall, and a second stepped surface between the second inclined wall and the outer wall of the partition wall. The first electrode connection section is disposed on the first stepped surface, and the second electrode connection section is disposed on the second stepped surface.

[0014] The first electrode is connected to the first pixel electrode through the first electrode connection segment, and the second electrode is connected to the second pixel electrode through the second electrode connection segment. The width of the partition wall is greater than the width of the electrode gap. The orthographic projection of the first pixel electrode on the first substrate covers the orthographic projection of the first electrode connection segment on the first substrate, and the orthographic projection of the second pixel electrode on the first substrate covers the orthographic projection of the second electrode connection segment on the first substrate.

[0015] Optionally, the electronic paper display panel further includes a light guide plate, which is disposed on the side of the opposing substrate away from the first substrate, and a light outlet is provided on the side of the light guide plate that is in contact with the opposing substrate. The orthographic projection of the light outlet on the opposing substrate coincides with the orthographic projection of the partition wall on the opposing substrate.

[0016] Optionally, the cross-sectional shape of the receiving groove is inverted and triangular.

[0017] Optionally, the cross-sectional shape of the receiving groove is an inverted isosceles trapezoid.

[0018] This application also discloses a method for preparing an electronic paper display panel, the steps of which include:

[0019] An active switching layer is formed on the first substrate;

[0020] A pixel electrode is formed on the active switching layer;

[0021] Color resist is formed on the pixel electrode to form an array substrate;

[0022] A light-utilizing layer is formed on the opposing substrate, and an electrophoretic reflective layer is formed on the light-utilizing layer.

[0023] The opposing substrate and the array substrate are arranged in a box, and the light utilization layer and the electrophoretic reflective layer are located between the opposing substrate and the array substrate.

[0024] Optionally, the step of forming a light-utilizing layer on the opposing substrate includes:

[0025] A substrate layer is formed on the opposing substrate;

[0026] A receiving groove is formed on the substrate layer at the position corresponding to the electrode gap, and the receiving groove includes a first inclined wall and a second inclined wall;

[0027] A first electrode is formed on the surface of the first inclined wall, and a second electrode is formed on the surface of the second inclined wall;

[0028] Microcup grooves are formed at the locations corresponding to pixel unit regions in the substrate layer, and black electrophoretic particles and white electrophoretic particles are filled in the microcup grooves and the receiving grooves.

[0029] This application also discloses a display device, which includes a driving circuit and an electronic paper display panel, wherein the driving circuit drives the electronic paper display panel to display an image.

[0030] Compared to existing electronic paper display panels, the electronic paper display panel of this application reflects light from the opposing substrate side onto the light-utilizing layer in the direction of the adjacent color resist. This means the light from the opposing substrate side onto the light-utilizing layer is reflected onto the adjacent color resist, then passes through the color resist and is absorbed or reflected by the electrophoretic particles below it. Because this increases the amount of light entering from the opposing substrate side, the display brightness of the electronic paper display panel can be improved. Furthermore, the light reflected by the light-utilizing layer passes through the color resist and is then absorbed or reflected by the electrophoretic particles below it, thereby improving the contrast and color performance of the electronic paper display panel. Attached Figure Description

[0031] 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:

[0032] Figure 1 This is a schematic diagram of a display device according to an embodiment of this application;

[0033] Figure 2 This is a schematic diagram of an electronic paper display panel according to the first embodiment of this application;

[0034] Figure 3 This is a schematic diagram of a light-utilizing layer according to the first embodiment of this application;

[0035] Figure 4 This is a schematic diagram of an active switching layer according to the first embodiment of this application;

[0036] Figure 5 This is a schematic diagram of a first electrode and a second electrode according to the first embodiment of this application;

[0037] Figure 6 This is an enlarged schematic diagram of a first electrode and a second electrode according to the first embodiment of this application;

[0038] Figure 7 This is a schematic diagram of a separation wall according to the first embodiment of this application;

[0039] Figure 8 This is a schematic diagram of a method for manufacturing an electronic paper display panel according to an embodiment of this application;

[0040] Figure 9 This is a schematic diagram of the manufacturing process of an electronic paper display panel according to an embodiment of this application;

[0041] Figure 10 This is a schematic diagram of the fabrication process of a light-utilizing layer 200 according to an embodiment of this application;

[0042] Figure 11 This is a schematic diagram of an electronic paper display panel according to a second embodiment of this application;

[0043] Figure 12 This is an enlarged schematic diagram of a receiving groove according to a second embodiment of this application.

[0044] Among them, 10 is a display device; 20 is a driving circuit; 30 is an electronic paper display panel; 40 is a pixel unit area; 41 is a first pixel unit area; 42 is a second pixel unit area; 100 is an array substrate; 110 is a first substrate; 120 is an active switching layer; 121 is a data line; 122 is a scan line; 123 is a common electrode; 130 is a pixel electrode; 131 is a first pixel electrode; 132 is a second pixel electrode; 140 is an electrode gap; 150 is a color resist; 200 is a light utilization layer; 210 is a partition wall; 220 is a receiving groove; 221 is the second pixel unit area; 222 is the third pixel unit area; 223 is the fourth pixel unit area; 100 is an array substrate; 110 is a first substrate; 120 is an active switching layer; 121 is a data line; 122 is a scan line; 123 is a common electrode; 130 is a pixel electrode; 131 is a first pixel electrode; 132 is a second pixel electrode; 140 is an electrode gap; 150 is a color resist; 200 is a light utilization layer; 210 is a partition wall; 220 is a receiving groove; 221 is the second pixel unit area; 222 is the third ... 222. Inclined wall; 230. Light reflection structure; 241. White electrophoretic particles; 242. Black electrophoretic particles; 251. First electrode; 252. Second electrode; 253. First electrode connection segment; 254. Second electrode connection segment; 260. Separation wall; 270. Protrusion; 281. First step surface; 282. Second step surface; 290. Substrate layer; 291. Microcup groove; 300. Electrophoretic reflective layer; 400. Opposing substrate; 410. Second substrate; 420. Common electrode; 500. Light guide plate; 510. Light outlet. Detailed Implementation

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] The present application will now be described in detail with reference to the accompanying drawings and optional embodiments.

[0050] 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 drives the electronic paper display panel 30 to display images.

[0051] 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:

[0052] Example 1:

[0053] Figure 2 This is a schematic diagram of an electronic paper display panel according to the first embodiment of this application, as shown below. Figure 2 As shown, Figure 2 The direction indicated by the dashed arrow in the middle represents the propagation direction of some light rays. This application discloses an electronic paper display panel 30, which includes an array substrate 100, a light utilization layer 200, an electrophoretic reflective layer 300, and an opposing substrate 400. The light utilization layer 200 and the electrophoretic reflective layer 300 are located between the array substrate 100 and the opposing substrate 400.

[0054] The array substrate 100 includes a first substrate 110, an active switching layer 120, a plurality of pixel electrodes 130, and a plurality of color resists 150. The active switching layer 120, the pixel electrodes 130, and the color resists 150 are sequentially disposed on the first substrate 110. There is an electrode gap 140 between two adjacent pixel electrodes 130. The light utilization layer 200 is located at the electrode gap 140 and defines a plurality of pixel unit regions 40. The pixel electrodes 130, the color resists 150, and the pixel unit regions 40 correspond one-to-one.

[0055] The light-utilizing layer 200 is used to reflect light rays that are incident on the light-utilizing layer 200 from the side of the opposing substrate 400 toward the adjacent color filter 150.

[0056] The light-utilizing layer 200 defines a plurality of microcup grooves 291 between the array substrate 100 and the opposing substrate 400, and the electrophoretic reflective layer 300 fills the microcup grooves 291.

[0057] For example, the electrophoretic reflective layer 300 includes electrophoretic particles, including white electrophoretic particles 241 and black electrophoretic particles 242. Of course, the electrophoretic particles may also include red electrophoretic particles, green electrophoretic particles and blue electrophoretic particles. This application takes the electrophoretic reflective layer 300 including black electrophoretic particles 242 and white electrophoretic particles 241 as an example.

[0058] The opposing substrate 400 includes a second substrate 410 and a common electrode 420. The common electrode 420 is disposed on the side of the second substrate 410 close to the common electrode 420. The common electrode 420 and the pixel electrode 130 form an electric field to drive the black electrophoretic particles 242 and the white electrophoretic particles 241 to move up and down, thereby absorbing and reflecting the light entering from the array substrate 100 side, and thus displaying the image.

[0059] The electronic paper display panel 30 described in this application is an electronic paper display panel 30 with light incident from the array substrate 100 side. Simply put, the color resist 150 is disposed on the side of the array substrate 100, and the array substrate 100 is the light emitting surface.

[0060] White electrophoretic particles 241 carry a positive charge, and black electrophoretic particles 242 carry a negative charge. The pixel electrode 130 of this application is closer to the output surface. This allows the pixel electrode 130 to directly drive the electrophoretic particles during display. Furthermore, the closer the pixel electrode 130 and the electrophoretic particles are, the stronger the interaction force between them, thereby improving the response speed of the electronic paper display panel 30. Moreover, since electrophoretic particles with the same charge repel each other, the pixel electrode 130 can also help the electrophoretic particles to aggregate more during display.

[0061] For example, when the current pixel unit area 40 needs to display a high grayscale, the pixel electrode 130 is negatively charged, and the white electrophoretic particles 241 are attracted to the pixel electrode 130. As the distance between the white electrophoretic particles 241 and the pixel electrode 130 gets closer, the white electrophoretic particles 241 move faster and become more concentrated.

[0062] For example, when the current pixel unit area 40 needs to display the bottom gray level, the pixel electrode 130 is positively charged, and the black electrophoretic particles 242 are attracted to the pixel electrode 130. As the distance between the black electrophoretic particles 242 and the pixel electrode 130 gets closer, the black electrophoretic particles 242 move faster and become more concentrated.

[0063] However, the electronic paper display panel 30 that uses the array substrate 100 side as the light-emitting side, especially the electronic paper display panel 30 that also has a color resist 150, has a low brightness display problem. The main reason is that the external light needs to pass through the array substrate 100 first and shine on the electrophoretic reflective layer 300. The light reflected by the electrophoretic reflective layer 300 needs to pass through the array substrate 100 again before it can enter the user's eyes.

[0064] Since each pixel unit region 40 in the array substrate 100 of the electronic paper display panel 30 contains a pixel electrode 130, a common electrode 123, an active switch, a data line 121, and a scan line 122, and the movement speed of the electrophoretic particles in the electronic paper display panel 30 is slower than the charging speed of the pixel electrode 130.

[0065] Therefore, a large storage capacitor is needed to maintain the movement of electrophoretic particles to ensure that the electrophoretic particles can move to the target position. As a result, the area of ​​the common electrode 123 is large. Although both the common electrode 123 and the pixel electrode 130 are made of light-transmitting conductive materials, such as ITO, the brightness of the entire electronic paper display panel 30 is reduced because external light needs to pass through the pixel electrode 130 and the common electrode 123 twice. In addition, the color resist 150 is also set.

[0066] Therefore, this application adds a light utilization layer 200 to the electronic paper display panel 30. Compared with existing electronic paper display panels, the electronic paper display panel 30 of this application reflects light irradiated from the opposing substrate 400 side onto the light utilization layer 200 towards the adjacent color resist 150 through the light utilization layer 200. In this way, the light irradiated from the opposing substrate 400 side onto the light utilization layer 200 is reflected onto the adjacent color resist 150, and then passes through the color resist 150 and is absorbed or reflected by the electrophoretic particles below the color resist 150. Firstly, the increased light from the opposing substrate 400 side can improve the display brightness of the electronic paper display panel 30. Secondly, the light reflected by the light utilization layer 200 passes through the color resist 150 and is then absorbed or reflected by the electrophoretic particles below the color resist 150, thereby improving the contrast and color performance of the electronic paper display panel 30.

[0067] The second substrate 410 is a transparent glass substrate. The common electrode 420 can be made entirely of a light-transmitting conductive material, such as ITO. Alternatively, it can be partially made of a light-transmitting conductive material and partially made of an opaque conductive material. For example, the common electrode 420 directly below the light-utilizing layer 200 can be made of a light-transmitting conductive material, while other areas can be made of an opaque conductive material. This satisfies the requirement that external light can irradiate the light-utilizing layer 200 from the side of the opposing substrate 400. Preferably, the entire common electrode 420 of this application is made of a light-transmitting conductive material.

[0068] The light utilization layer 200 includes a partition wall 210, a receiving groove 220 and a light reflection structure 230. One end of the partition wall 210 abuts against the opposing substrate 400 and the other end abuts against the array substrate 100, and is located between two adjacent color filters 150. The receiving groove 220 is located at the end of the partition wall 210 away from the opposing substrate 400.

[0069] The receiving groove 220 includes a first inclined wall 221 and a second inclined wall 222. The first inclined wall 221 and the second inclined wall 222 are both inclined and face the two adjacent color filters 150 respectively. The surfaces of the first inclined wall 221 and the second inclined wall 222 are provided with light reflection structures 230.

[0070] The material of the partition wall 210 includes either PFA (Polyfluoroalkoxy, soluble polytetrafluoroethylene) or PS (Polystyrene). Since PFA and PS have high transmittance, light can pass through the partition wall 210 with low loss.

[0071] In this way, the light that shines from the opposing substrate 400 onto the light reflection structure 230 will be reflected by the light reflection structure 230 to the underside of the adjacent color resist 150, and thus be reflected out of the electronic paper display panel 30 by the white electrophoretic particles 241 under the color resist 150, or absorbed by the black electrophoretic particles 242 under the color resist 150.

[0072] Figure 3 This is a schematic diagram of a light-utilizing layer according to the first embodiment of this application, combined with... Figure 3 As shown, preferably, the light utilization layer 200 of this application does not have a light reflection structure 230, but instead has white electrophoretic particles 241. In this way, when the light utilization layer 200 is prepared, the white electrophoretic particles 241 in the light utilization layer 200 and the white electrophoretic particles 241 in the electrophoretic reflection layer 300 can be filled at the same time, thereby reducing one step of the process and improving the preparation efficiency.

[0073] Specifically, the light utilization layer 200 includes a partition wall 210, a receiving groove 220, and white electrophoretic particles 241. One end of the partition wall 210 abuts against the opposing substrate 400, and the other end abuts against the array substrate 100, and is located between two adjacent color resists 150. The receiving groove 220 is located at the end of the partition wall 210 away from the opposing substrate 400, and the white electrophoretic particles 241 are located in the receiving groove 220.

[0074] The receiving groove 220 includes a first inclined wall 221 and a second inclined wall 222, both of which are inclined and face the two adjacent color resists 150 respectively.

[0075] In simple terms, the angle between the first inclined wall 221 on the left and the horizontal plane is less than 90 degrees, and the angle between the second inclined wall 222 on the right and the horizontal plane is less than 90 degrees. In this embodiment, the cross-sectional shape of the receiving groove 220 is inverted and triangular.

[0076] Furthermore, when the pixel unit area 40 on the side away from the first inclined wall 221 displays black (in other words, displays a low grayscale), and the pixel unit area 40 on the side away from the second inclined wall 222 displays a bright color (in other words, displays a high grayscale), the pixel electrode 130 in the black pixel unit area 40 is positively charged, and the pixel electrode 130 in the bright pixel unit area 40 is negatively charged. The pixel electrode 130 in the black pixel unit area 40 will drive the white electrophoretic particles 241 in the receiving groove 220 to the second inclined wall 222, and the pixel electrode 130 in the bright pixel unit area 40 will attract the white electrophoretic particles 241 in the receiving groove 220 to the second inclined wall 222. At this time, the white electrophoretic particles 241 are located on the second inclined wall 222.

[0077] In this way, the light irradiated from the opposing substrate 400 onto the second inclined wall 222 will be reflected by the white electrophoretic particles 241 in the receiving groove 220 onto the color resist 150 in the pixel unit area 40 that displays bright colors, and thus reflected out of the electronic paper display panel 30 by the white electrophoretic particles 241 under the color resist 150 in the pixel unit area 40 that displays bright colors.

[0078] Figure 4 This is a schematic diagram of an active switching layer according to the first embodiment of this application, combined with... Figure 4As shown, the active switching layer 120 further includes data lines 121 and scan lines 122. The data lines 121 and scan lines 122 are both disposed on the first substrate 110, and the data lines 121 and scan lines 122 are arranged in a crisscross pattern to define the pixel unit region 40. The data lines 121 and scan lines 122 are both made of a metal material such as Cu, and the orthogonal projection of the light utilization layer 200 on the first substrate 110 covers the orthogonal projection of the data lines 121 and scan lines 122 on the first substrate 110.

[0079] In this way, the light that would otherwise be unable to escape at the data lines 121 and scan lines 122 will be reflected by the light utilization layer 200 and exit above the color resist 150, thereby further improving the brightness, contrast, and color performance of the electronic paper display panel 30. Moreover, the presence of the data lines 121 and scan lines 122 can also prevent light entering from the array substrate 100 side from shining on the electrophoretic particles in the receiving groove 220, thus avoiding the appearance of abnormal quadrants in the image.

[0080] Figure 5 This is a schematic diagram of a first electrode and a second electrode according to the first embodiment of this application. Figure 6 This is an enlarged schematic diagram of a first electrode and a second electrode according to the first embodiment of this application, in conjunction with... Figure 5 and Figure 6 As shown, two adjacent pixel unit regions 40 are defined as the first pixel unit region 41 and the second pixel unit region 42.

[0081] The light utilization layer 200 further includes a first electrode 251, a second electrode 252, and black electrophoretic particles 242. The black electrophoretic particles 242 are located within the receiving groove 220. The first electrode 251 is located on the first inclined wall 221, and the second electrode 252 is located on the second inclined wall 222. The first electrode 251 is located on the side of the second electrode 252 closer to the first pixel unit region 41, and the second electrode 252 is located on the side of the first electrode 251 closer to the second pixel unit region 42. The first electrode 251 is connected to the pixel electrode 130 in the first pixel unit region 41, and the second electrode 252 is connected to the pixel electrode 130 in the second pixel unit region 42.

[0082] Specifically, the first electrode 251 is connected to the pixel electrode 130 in the first pixel unit region 41 to drive the movement of electrophoretic particles in the receiving groove 220; the second electrode 252 is connected to the pixel electrode 130 in the second pixel unit region 42 to drive the movement of electrophoretic particles in the receiving groove 220. It is understood that the first electrode 251 and the second electrode 252 are not connected together.

[0083] Thus, when the first pixel unit area 41 displays a low grayscale and the second pixel unit area 42 displays a high grayscale, the pixel electrode 130 in the first pixel unit area 41 is positively charged and the pixel electrode 130 in the second pixel unit area 42 is negatively charged.

[0084] The pixel electrode 130 in the first pixel unit region 41 will drive the white electrophoretic particles 241 in the receiving tank 220 onto the second inclined wall 222 through the first electrode 251 and the second electrode 252, and the pixel electrode 130 in the first pixel unit region 41 will adsorb the black electrophoretic particles 242 in the receiving tank 220 onto the first inclined wall 221 through the first electrode 251 and the second electrode 252.

[0085] The pixel electrode 130 in the second pixel unit region 42 will attract the white electrophoretic particles 241 in the receiving groove 220 to the second inclined wall 222 through the first electrode 251 and the second electrode 252. The pixel electrode 130 in the second pixel unit region 42 will drive the black electrophoretic particles 242 in the receiving groove 220 to the first inclined wall 221 through the first electrode 251 and the second electrode 252. At this time, the white electrophoretic particles 241 are located on the second inclined wall 222, and the black electrophoretic particles 242 are located on the first inclined wall 221.

[0086] In this way, the light that shines from the opposing substrate 400 onto the second inclined wall 222 will be reflected by the white electrophoretic particles 241 in the receiving groove 220 onto the color resist 150 in the second pixel unit area 42 that displays high grayscale, and thus reflected by the white electrophoretic particles 241 below out of the electronic paper display panel 30.

[0087] The light rays illuminating the first inclined wall 221 from the opposing substrate 400 are directly absorbed by the black electrophoretic particles 242 in the receiving groove 220, thereby further improving the contrast of the electronic paper display panel 30. Moreover, there is no need to add a separate driving circuit 20 to the electrophoretic particles in the receiving groove 220, thus saving the driving cost of the electronic paper display panel 30.

[0088] Furthermore, to ensure the connection reliability between the first electrode 251 and the first pixel electrode 131 in the first pixel unit region 41, and to ensure the connection reliability between the second electrode 252 and the second pixel electrode 132 in the second pixel unit region 42, this application also adds a first electrode connection segment 253 and a second electrode 252 connection segment, as follows:

[0089] The pixel electrode 130 in the first pixel unit region 41 is defined as the first pixel electrode 131, and the pixel electrode 130 in the second pixel unit region 42 is defined as the second pixel electrode 132.

[0090] The light utilization layer 200 further includes a first electrode connection section 253 and a second electrode connection section 252. There is a first step surface 281 between the first inclined wall 221 and the outer wall of the partition wall 210, and a second step surface 282 between the second inclined wall 222 and the outer wall of the partition wall 210. The first electrode connection section 253 is disposed on the first step surface 281, and the second electrode connection section 254 is disposed on the second step surface 282.

[0091] The first electrode 251 is connected to the first pixel electrode 131 through the first electrode connection segment 253, and the second electrode 252 is connected to the second pixel electrode 132 through the second electrode connection segment 254. The width of the partition wall 210 is greater than the width of the electrode gap 140. The orthographic projection of the first pixel electrode 131 on the first substrate 110 covers the orthographic projection of the first electrode connection segment 253 on the first substrate 110, and the orthographic projection of the second pixel electrode 132 on the first substrate 110 covers the orthographic projection of the second electrode connection segment 254 on the first substrate 110.

[0092] In other words, when setting the receiving groove 220, the maximum width of the receiving groove 220 is less than the width of the partition wall 210. The maximum width of the receiving groove 220 is the width of the opening. This ensures that a first step surface 281 and a second step surface 282 are formed on the left and right sides of the opening of the receiving groove 220. Furthermore, the distance between the first pixel electrode 131 and the second pixel electrode 132 is reduced. This ensures that when the opposing substrate 400 and the array substrate 100 are aligned, the first electrode connection segment 253 on the first step surface 281 can abut against the first pixel electrode 131, and the second electrode connection segment 254 on the second step surface 282 can abut against the second pixel electrode 132. This ensures the reliability of the connection between the first electrode 251 and the first pixel electrode 131 in the first pixel unit region 41, and the reliability of the connection between the second electrode 252 and the second pixel electrode 132 in the second pixel unit region 42.

[0093] Furthermore, the depth of the receiving groove 220 is the same as the thickness of the color resist 150, so as to ensure that the light reflected from the first inclined wall 221 or the second inclined wall 222 can pass through the adjacent color resist 150 and will not directly irradiate the electrophoretic particles in the microcup groove 291.

[0094] This application also provides a light guide plate 500 on the side of the opposing substrate 400 away from the array substrate 100, that is, the electronic paper display panel 30 further includes a light guide plate 500. The light guide plate 500 is disposed on the side of the opposing substrate 400 away from the first substrate 110, and a light outlet 510 is provided on the side of the light guide plate 500 that is in contact with the opposing substrate 400. The orthographic projection of the light outlet 510 on the opposing substrate 400 coincides with the orthographic projection of the partition wall 210 on the opposing substrate 400.

[0095] By setting the light guide plate 500, most of the light that shines on the light guide plate 500 can be guided into the light utilization layer 200, which can further increase the light intensity in the light utilization layer 200 and further increase the brightness of the electronic paper display panel 30.

[0096] Figure 7 This is a schematic diagram of a separation wall according to the first embodiment of this application, as shown below. Figure 7 As shown, a separation wall 260 is provided in the receiving groove 220. The separation wall 260 is located between four adjacent pixel unit regions 40 arranged in a matrix, thereby avoiding interference between electrophoretic particles in the left and right and upper and lower receiving grooves 220 of the separation wall 260.

[0097] Figure 8 This is a schematic diagram illustrating a method for manufacturing an electronic paper display panel according to an embodiment of this application. Figure 9 This is a schematic diagram of the fabrication process of an electronic paper display panel according to an embodiment of this application, combined with... Figure 8 and Figure 9 This application also discloses a method for manufacturing an electronic paper display panel 30, the steps of which include:

[0098] S1: An active switching layer is formed on the first substrate;

[0099] S2: A pixel electrode is formed on the active switching layer;

[0100] S3: Forming color resist on the pixel electrode to form an array substrate;

[0101] S4: A light-utilizing layer is formed on the opposing substrate, and an electrophoretic reflective layer is formed on the light-utilizing layer.

[0102] S5: The opposing substrate and the array substrate are arranged in a box, and the light utilization layer and the electrophoretic reflective layer are located between the opposing substrate and the array substrate.

[0103] Compared to existing electronic paper display panels, the electronic paper display panel 30 of this application reflects light irradiated from the opposing substrate 400 side onto the light utilization layer 200 towards the adjacent color resist 150 through the light utilization layer 200. In this way, the light irradiated from the opposing substrate 400 side onto the light utilization layer 200 is reflected onto the adjacent color resist 150, and then passes through the color resist 150 and is absorbed or reflected by the electrophoretic particles below the color resist 150. Firstly, by increasing the light entering from the opposing substrate 400 side, the display brightness of the electronic paper display panel 30 can be improved. Secondly, the light reflected by the light utilization layer 200 passes through the color resist 150 and is then absorbed or reflected by the electrophoretic particles below the color resist 150, thereby improving the contrast and color performance of the electronic paper display panel 30.

[0104] Figure 10 This is a schematic diagram of the fabrication process of a light-utilizing layer 200 according to an embodiment of this application, as shown below. Figure 10 As shown, S4: The step of forming a light-utilizing layer 200 on the opposing substrate 400 and simultaneously forming an electrophoretic reflective layer 300 on the light-utilizing layer 200 includes:

[0105] S41: Form a base layer on the opposing substrate;

[0106] S42: A receiving groove is formed on the substrate layer at the position corresponding to the electrode gap, and the receiving groove includes a first inclined wall and a second inclined wall;

[0107] S43: A first electrode is formed on the surface of the first inclined wall, and a second electrode is formed on the surface of the second inclined wall;

[0108] S44: A microcup groove is formed at the position of the pixel unit area in the base layer, and black electrophoretic particles and white electrophoretic particles are filled in the microcup groove and the receiving groove to form a light utilization layer and an electrophoretic reflection layer.

[0109] The material of the substrate layer 290 may include any one of PFA or PS, with PFA and PS having high transmittance. Then, after the opposing substrate 400 and the array substrate 100 are assembled together, the first electrode 251 and the first pixel electrode 131 are connected, and the second electrode 252 and the second pixel electrode 132 are connected.

[0110] When the first pixel unit region 41 displays a low grayscale and the second pixel unit region 42 displays a high grayscale, the pixel electrode 130 in the first pixel unit region 41 is positively charged and the pixel electrode 130 in the second pixel unit region 42 is negatively charged.

[0111] The pixel electrode 130 in the first pixel unit region 41 will drive the white electrophoretic particles 241 in the receiving tank 220 onto the second inclined wall 222 through the first electrode 251 and the second electrode 252, and the pixel electrode 130 in the first pixel unit region 41 will adsorb the black electrophoretic particles 242 in the receiving tank 220 onto the first inclined wall 221 through the first electrode 251 and the second electrode 252.

[0112] The pixel electrode 130 in the second pixel unit region 42 will attract the white electrophoretic particles 241 in the receiving groove 220 to the second inclined wall 222 through the first electrode 251 and the second electrode 252. The pixel electrode 130 in the second pixel unit region 42 will drive the black electrophoretic particles 242 in the receiving groove 220 to the first inclined wall 221 through the first electrode 251 and the second electrode 252. At this time, the white electrophoretic particles 241 are located on the second inclined wall 222, and the black electrophoretic particles 242 are located on the first inclined wall 221.

[0113] In this way, the light that shines from the opposing substrate 400 onto the second inclined wall 222 will be reflected by the white electrophoretic particles 241 in the receiving groove 220 onto the color resist 150 in the second pixel unit area 42 that displays high grayscale, and thus reflected by the white electrophoretic particles 241 below out of the electronic paper display panel 30.

[0114] The light rays illuminating the first inclined wall 221 from the opposing substrate 400 are directly absorbed by the black electrophoretic particles 242 in the receiving groove 220, thereby further improving the contrast of the electronic paper display panel 30. Moreover, there is no need to add a separate driving circuit 20 to the electrophoretic particles in the receiving groove 220, thus saving the driving cost of the electronic paper display panel 30.

[0115] Example 2:

[0116] Figure 11 This is a schematic diagram of an electronic paper display panel according to a second embodiment of this application. Figure 12 This is an enlarged schematic diagram of a receiving groove according to a second embodiment of this application, as shown below. Figures 11-12 As shown, unlike the first embodiment, the cross-sectional shape of the receiving groove 220 in this embodiment is an inverted isosceles trapezoid.

[0117] Compared to the solution in the first embodiment, this embodiment sets the cross-sectional shape of the receiving groove 220 to an inverted isosceles trapezoid, which is equivalent to expanding the distance between the first inclined wall 221 and the second inclined wall 222. This avoids the possibility of the end of the first electrode 251 away from the first pixel electrode 131 and the end of the second electrode 252 away from the second pixel electrode 132 connecting, thus preventing the adjacent two pixel unit regions 40 from failing and failing to display normally.

[0118] Furthermore, a protrusion 270 can be provided at the bottom of the receiving groove 220. The cross-sectional shape of the protrusion 270 is an upright triangle. By providing the protrusion 270, the end of the first electrode 251 away from the first pixel electrode 131 and the second electrode 252 away from the second pixel electrode 132 can be connected during the preparation process. This can also prevent the white electrophoretic particles 241 and the black electrophoretic particles 242 from attracting each other and sticking together.

[0119] 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.

[0120] 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.

[0121] 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, a light utilization layer, an electrophoretic reflective layer and a counter substrate, the light utilization layer and the electrophoretic reflective layer are located between the array substrate and the counter substrate; The array substrate comprises a first substrate, an active switch layer, a plurality of pixel electrodes and a plurality of color resist, the active switch layer, the pixel electrodes and the color resist are sequentially arranged on the first substrate, there is an electrode gap between adjacent two pixel electrodes, the light utilization layer is located at the electrode gap, and the light utilization layer defines a plurality of pixel unit regions, the pixel electrodes, the color resist and the pixel unit regions correspond one by one; the light utilization layer is used for reflecting light rays irradiated onto the light utilization layer from the counter substrate side to the direction of adjacent color resist; The light utilization layer comprises a partition wall, a containing groove, white electrophoretic particles and black electrophoretic particles, one end of the partition wall abuts against the counter substrate, the other end abuts against the array substrate, and is located between adjacent two color resist, the containing groove is located at one end of the partition wall away from the counter substrate, the white electrophoretic particles are located in the containing groove, and the black electrophoretic particles are located in the containing groove; the containing groove comprises a first inclined wall and a second inclined wall, the first inclined wall and the second inclined wall are both inclinedly arranged and respectively face adjacent two color resist; Defining adjacent two pixel unit regions as a first pixel unit region and a second pixel unit region; the light utilization layer further comprises a first electrode and a second electrode, the first electrode is located on the first inclined wall, the second electrode is located on the second inclined wall, and the first electrode is located on the side of the second electrode close to the first pixel unit region, the second electrode is located on the side of the first electrode close to the second pixel unit region, the first electrode is connected with the pixel electrode in the first pixel unit region, and the second electrode is connected with the pixel electrode in the second pixel unit region.

2. The electronic paper display panel of claim 1, wherein, Defining the pixel electrode in the first pixel unit region as a first pixel electrode, and defining the pixel electrode in the second pixel unit region as a second pixel electrode; The light utilization layer further comprises a first electrode connecting section and a second electrode connecting section, there is a first step surface between the first inclined wall and the outer wall of the partition wall, there is a second step surface between the second inclined wall and the outer wall of the partition wall, the first electrode connecting section is arranged on the first step surface, and the second electrode connecting section is arranged on the second step surface; The first electrode is connected with the first pixel electrode through the first electrode connecting section, the second electrode is connected with the second pixel electrode through the second electrode connecting section, the width of the partition wall is greater than the width of the electrode gap, the orthographic projection of the first pixel electrode on the first substrate covers the orthographic projection of the first electrode connecting section on the first substrate, and the orthographic projection of the second pixel electrode on the first substrate covers the orthographic projection of the second electrode connecting section on the first substrate.

3. The electronic paper display panel of claim 1, wherein, The electronic paper display panel further comprises a light guide plate arranged on the side of the opposite substrate away from the first substrate, and a light outlet is arranged on the side of the light guide plate close to the opposite substrate, and the light outlet is arranged on the opposite substrate in a position where the orthographic projection of the light outlet on the opposite substrate coincides with the orthographic projection of the partition wall on the opposite substrate.

4. The electronic paper display panel of claim 1, wherein, The cross section of the accommodating groove is in the shape of an inverted triangle.

5. The electronic paper display panel of claim 1, wherein, The cross section of the accommodating groove is in the shape of an inverted isosceles trapezoid. 6.A method for manufacturing an electronic paper display panel, characterized by, The preparation method of the electronic paper display panel is used for preparing the electronic paper display panel as claimed in any one of claims 1-5, and the steps of the preparation method of the electronic paper display panel comprise: forming an active switch layer on the first substrate; forming a pixel electrode on the active switch layer; forming a color resistance on the pixel electrode to form an array substrate; forming a light utilization layer on the opposite substrate, and forming an electrophoretic reflective layer on the light utilization layer; arranging the opposite substrate and the array substrate in a sandwiched manner, and the light utilization layer and the electrophoretic reflective layer are located between the opposite substrate and the array substrate.

7. The method of claim 6, wherein the method further comprises: The step of forming the light utilization layer on the opposite substrate comprises: forming a base layer on the opposite substrate; forming an accommodating groove on the base layer at a position corresponding to the electrode gap, and the accommodating groove comprises a first inclined wall and a second inclined wall; forming a first electrode on the surface of the first inclined wall, and forming a second electrode on the surface of the second inclined wall; forming a micro-cup groove on the base layer at a position corresponding to a pixel unit region, and filling black electrophoretic particles and white electrophoretic particles in the micro-cup groove and the accommodating groove.

8. A display device, characterized by comprising: The display device comprises a driving circuit and the electronic paper display panel as claimed in any one of claims 1-5, and the driving circuit drives the electronic paper display panel to display a picture.

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