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

Abstract

The application discloses an electronic paper display panel and a preparation method and an electronic paper display device thereof, and mainly relates to the technical field of display. The electronic paper display panel comprises a first substrate, a micro-cup barrier wall, a light reflection control structure, a photoluminescence structure, a common electrode layer and a light channel layer. The micro-cup barrier wall is arranged on the first substrate and defines a plurality of micro-cups. The light reflection control structure is located in the micro-cup. The photoluminescence structure is arranged on the inner wall of the micro-cup barrier wall. The light channel layer is arranged on the side of the micro-cup barrier wall away from the first substrate. The common electrode layer is located between the light channel layer and the micro-cup barrier wall. The light channel layer comprises a plurality of light channels. The light channels correspond to the photoluminescence structure. The first substrate is used for controlling the light reflection control structure to reflect or absorb light. Through the above design, the display picture uniformity of the electronic paper display panel is improved, and the display effect of the electronic paper display panel is improved.

Description

Technical Field

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

[0002] As a reflective display technology, electronic paper display panels have been widely used in e-readers, electronic shelf labels, wearable devices and other fields due to their visual experience close to that of traditional paper, ultra-low power consumption and excellent visibility under strong light. The technical principle of traditional electronic paper display panels determines that they must rely on ambient light sources to be perceived by the human eye.

[0003] Therefore, long-persistence materials are usually placed in electronic paper display panels to provide a light source for displaying images in the absence of natural light. However, existing electronic paper display panels with long-persistence materials have low uniformity of display images. Summary of the Invention

[0004] The purpose of this application is to provide an electronic paper display panel and its preparation method, as well as an electronic paper display device, to improve the uniformity of the display image of the electronic paper display panel, thereby improving the display effect of the electronic paper display panel.

[0005] This application discloses an electronic paper display panel, which includes a first substrate, a microcup barrier, a light reflection control structure, a photoluminescent structure, a common electrode layer, and a light channel layer. The microcup barrier is disposed on the first substrate and defines a plurality of microcups. The light reflection control structure is located inside the microcups. The photoluminescent structure is disposed on the inner wall of the microcup barrier. The light channel layer is disposed on the side of the microcup barrier away from the first substrate. The common electrode layer is located between the light channel layer and the microcup barrier. The light channel layer includes a plurality of light channels, which correspond to the photoluminescent structure. The first substrate is used to control the light reflection control structure to reflect or absorb light.

[0006] Optionally, the electronic paper display panel further includes a second substrate and a controllable light-shielding layer. The controllable light-shielding layer and the second substrate are sequentially disposed on the side of the light channel layer opposite to the first substrate. The controllable light-shielding layer includes a plurality of light valve structures, which are disposed corresponding to the light channel. The second substrate is used to control the state of the light valve structures to switch between light transmission and light opacity.

[0007] Optionally, the electronic paper display panel further includes a light-concentrating structure disposed within the light channel, the light-concentrating structure being used to focus external light onto the photoluminescent structure.

[0008] Optionally, the electronic paper display panel further includes a color resist layer, which is disposed on the side of the microcup barrier away from the first substrate; the color resist layer includes a first color resist, a second color resist, and a third color resist, and the microcup corresponding to the first color resist is defined as the first microcup, the microcup corresponding to the second color resist is defined as the second microcup, and the microcup corresponding to the third color resist is defined as the third microcup; The photoluminescent structure in the first microcup is defined as the first photoluminescent structure, the photoluminescent structure in the second microcup is defined as the second photoluminescent structure, and the photoluminescent structure in the third microcup is defined as the third photoluminescent structure. The light emitted by the first photoluminescent structure is red, the light emitted by the second photoluminescent structure is green, and the light emitted by the third photoluminescent structure is blue.

[0009] Optionally, the difference between each pair of the afterglow brightness of the first photoluminescent structure, the afterglow brightness of the second photoluminescent structure, and the afterglow brightness of the third photoluminescent structure is less than a preset brightness difference.

[0010] Optionally, the number of light-emitting particles in the first photoluminescent structure is greater than the number of light-emitting particles in the third photoluminescent structure, and the number of light-emitting particles in the second photoluminescent structure is less than the number of light-emitting particles in the third photoluminescent structure.

[0011] Optionally, the electronic paper display panel further includes a second substrate and a controllable light-shielding layer. The controllable light-shielding layer and the second substrate are sequentially disposed on the side of the light channel layer away from the first substrate. The controllable light-shielding layer includes a plurality of light valve structures, which are disposed corresponding to the light channel. The second substrate is used to control the state of the light valve structures to switch between light transmission and light opacity. The light valve structure includes an anode control layer, a cathode control layer, a first electrochromic layer, a second electrochromic layer, and a third electrochromic layer. The first electrochromic layer corresponds to the first photoluminescent structure, the second electrochromic layer corresponds to the second photoluminescent structure, and the third electrochromic layer corresponds to the third photoluminescent structure. The anode control layer and the cathode control layer are respectively located close to the second substrate and away from the second substrate on the sides of the first electrochromic layer, the second electrochromic layer, and the third electrochromic layer. Under the same voltage, the transmittance of the second electrochromic layer, the transmittance of the third electrochromic layer, and the transmittance of the first electrochromic layer increase sequentially.

[0012] This application also discloses a method for preparing an electronic paper display panel. The method includes the following steps: Microcup walls are formed on a first substrate, the microcup walls defining a plurality of microcup; A photoluminescent structure is provided on the inner wall of the microcup baffle; A light reflection control structure is provided inside the microcup; A common electrode layer is formed on the optical channel layer, the optical channel layer including multiple optical channels, the optical channels corresponding to the photoluminescent structure, to form an opposing substrate; The opposing substrate is encapsulated in the microcup barrier.

[0013] Optionally, the step of forming a common electrode layer on the optical channel layer, wherein the optical channel layer includes a plurality of optical channels corresponding to the photoluminescent structure, to form a counter substrate includes: A controllable light-shielding layer is formed on a second substrate, the controllable light-shielding layer including multiple light valve structures; A light channel layer is formed on the controllable light-shielding layer. The light channel layer includes multiple light channels. The light valve structure is configured correspondingly to the light channels. The light channels are configured correspondingly to the photoluminescent structure. A common electrode layer is formed on the optical channel layer to form a counter substrate.

[0014] This application also discloses an electronic paper display device, which includes a driving circuit and an electronic paper display panel, wherein the driving circuit is connected to the electronic paper display panel.

[0015] Compared to existing electronic paper display panels with photoluminescent structures, this application provides a photoluminescent structure on the side wall of the microcup, i.e., one side of the microcup baffle, and provides a light channel on the top of the photoluminescent structure. This allows external light to directly illuminate the photoluminescent structure below when the ambient light is bright, thereby storing energy in the photoluminescent structure and improving the uniformity of the display image of the electronic paper display panel after the ambient light dims, thus improving the display effect of the electronic paper display panel. Attached Figure Description

[0016] 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: Figure 1 This is a schematic diagram of an electronic paper display device according to an embodiment of this application; Figure 2 This is a schematic diagram of the optical path of an electronic paper display panel in a bright ambient light environment, according to the first embodiment of this application. Figure 3 This is a schematic diagram of the optical path of an electronic paper display panel in a dimly lit environment, according to the first embodiment of this application. Figure 4 This is a schematic diagram of a controllable light-shielding layer according to the first embodiment of this application; Figure 5 This is a schematic diagram of a light-concentrating structure according to the first embodiment of this application; Figure 6 This is a schematic diagram of a color resist layer according to the first embodiment of this application; Figure 7 This is a schematic diagram of a light valve structure according to the first embodiment of this application; Figure 8 yes Figure 7 A magnified view of a portion of the image; Figure 9 This is a schematic diagram of a voltage compensation module according to the first embodiment of this application; Figure 10 This is a schematic diagram of an electronic paper display panel according to a second embodiment of this application; Figure 11 This is a process diagram illustrating a method for manufacturing an electronic paper display panel according to an embodiment of this application; Figure 12 This is a schematic flowchart of a method for preparing an electronic paper display panel according to an embodiment of this application; Figure 13 This is a process diagram illustrating a method for preparing a controllable light-shielding layer according to an embodiment of this application; Figure 14a This is a partial flowchart illustrating a method for preparing a controllable light-shielding layer according to an embodiment of this application; Figure 14b This is a schematic diagram of the remaining part of a method for preparing a controllable light-shielding layer according to an embodiment of this application.

[0017] Among them, 10 is an electronic paper display device; 20 is a driving circuit; 30 is an electronic paper display panel; 40 is a voltage compensation module; 110 is a first substrate; 120 is a first substrate; 130 is a first active switching layer; 131 is a first active switch; 132 is a pixel electrode; 140 is a microcup barrier; 141 is a microcup; 151 is a first microcup; 152 is a second microcup; 153 is a third microcup; 200 is a light reflection control structure; 210 is a reflective layer; 220 is a hydrophobic layer; 230 is an electrophoretic ink; 300 is a photoluminescent structure; 310 is a first photoluminescent structure; 320 is a second photoluminescent structure; 330 is a third photoluminescent structure. Light-emitting structure; 410, common electrode layer; 420, color resist layer; 421, first color resist; 422, second color resist; 423, third color resist; 430, light channel layer; 431, light channel; 500, focusing structure; 510, left focusing section; 520, middle focusing section; 530, right focusing section; 600, controllable light-blocking layer; 610, light valve structure; 611, anode control layer; 612, cathode control layer; 621, first electrochromic layer; 622, second electrochromic layer; 623, third electrochromic layer; 700, second substrate; 710, second substrate; 720, second active switch layer; 721, second active switch. Detailed Implementation

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] The present application will now be described in detail with reference to the accompanying drawings and optional embodiments.

[0023] 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 The present 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.

[0024] 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, which is specifically described through several embodiments: Example 1: Figure 2 This is a schematic diagram of the optical path of an electronic paper display panel according to the first embodiment of this application in a bright ambient light environment. Figure 3 This is a schematic diagram of the optical path of an electronic paper display panel in a low ambient light environment, according to the first embodiment of this application. Figures 2-3 As shown, Figure 2 and Figure 3 The dashed arrow indicates the direction of propagation of some light rays.

[0025] This application discloses an electronic paper display panel 30, which includes a first substrate 110, a microcup barrier 140, a light reflection control structure 200, a photoluminescent structure 300, a common electrode layer 410, and a light channel layer 430. The microcup barrier 140 is disposed on the first substrate 110 and defines a plurality of microcup 141. The light reflection control structure 200 is located inside the microcup 141. The photoluminescent structure 300 is disposed on the inner wall of the microcup barrier 140. The light channel layer 430 is disposed on the side of the microcup barrier 140 away from the first substrate 110. The common electrode layer 410 is located between the light channel layer 430 and the microcup barrier 140. The light channel layer 430 includes a plurality of light channels 431, which correspond to the photoluminescent structure 300. The first substrate 110 is used to control the light reflection control structure 200 to reflect or absorb light.

[0026] It is understood that the light channel 431 corresponds to the photoluminescent structure 300, that is, the light channel 431 is located above the photoluminescent structure 300.

[0027] For ease of understanding, exemplarily, the light reflection control structure 200 includes a reflective layer 210, a hydrophobic layer 220, and an electrophoretic ink 230. The reflective layer 210 and the hydrophobic layer 220 are respectively disposed between the microcup 141 and the first substrate 110. The electrophoretic ink 230 is filled in the microcup 141, and the state of the electrophoretic ink 230 is controlled by an electric field formed between the first substrate 110 and the common electrode layer 410.

[0028] When the electrophoretic ink 230 is in a flat state, light entering the microcup 141 from the outside cannot be reflected out through the reflective layer 210, thus appearing black; when the electrophoretic ink 230 is in a converged state, light entering the microcup 141 from the outside can be reflected out through the reflective layer 210, thus appearing white.

[0029] For example, the first substrate 110 includes a first substrate 120 and a first active switching layer 130. The first active switching layer 130 is disposed on the first substrate 120 and includes a plurality of first active switches 131 and pixel electrodes 132. The first active switches 131 are connected to the pixel electrodes 132. The pixel electrodes 132 and the microcup 141 correspond one-to-one. By turning the first active switches 131 on and off, the display voltage is controlled to charge the pixel electrodes 132, so that an electric field is formed between the pixel electrodes 132 and the common electrode layer 410, thereby realizing the display of the image.

[0030] The existing photoluminescent structure 300 is located below the light reflection control structure 200. This can lead to situations where, for example, when the microcup 141 is displaying black for a long time, external light cannot reach the photoluminescent structure 300, resulting in uneven energy storage in the photoluminescent structure 300 of the electronic paper display panel 30. Consequently, the display image of the electronic paper display panel 30 becomes uneven after the ambient light dims.

[0031] Therefore, compared with the existing electronic paper display panel 30 with a photoluminescent structure 300, this application provides a photoluminescent structure 300 on the side wall of the microcup 141 and a light channel 431 on the top of the photoluminescent structure 300. This allows external light to directly illuminate the photoluminescent structure 300 below through the light channel 431 when the ambient light is bright, thereby enabling the photoluminescent structure 300 to store energy and improving the uniformity of the display image of the electronic paper display panel 30 after the ambient light dims, thus improving the display effect of the electronic paper display panel 30.

[0032] Figure 4 This is a schematic diagram of a controllable light-shielding layer according to the first embodiment of this application, combined with... Figure 4 As shown, the electronic paper display panel 30 further includes a second substrate 700 and a controllable light-shielding layer 600. The controllable light-shielding layer 600 and the second substrate 700 are sequentially disposed on the side of the light channel layer 430 away from the first substrate 110. The controllable light-shielding layer 600 includes a plurality of light valve structures 610. The light valve structures 610 are correspondingly disposed with the light channel 431. The second substrate 700 is used to control the state of the light valve structures 610 to switch between light transmission and light opacity.

[0033] It is understood that the light channel 431 is located above the photoluminescent structure 300, and the light valve structure 610 is located on the light channel 431. In this way, the state of the light valve structure 610 is controlled by the second substrate 700 to switch between light transmission and light opacity.

[0034] When the ambient light is bright, the second substrate 700 controls the state of the light valve structure 610 to be light-transmitting. At this time, the ambient light can pass through the light valve structure 610 and the light channel 431 to irradiate the photoluminescent structure 300, and the photoluminescent structure 300 stores energy.

[0035] When the ambient light is bright, the second substrate 700 controls the light valve structure 610 to be opaque. At this time, the light from the outside cannot pass through the light valve structure 610 and the light channel 431 to illuminate the photoluminescent structure 300. The long afterglow light emitted by the photoluminescent structure 300 will not be emitted directly to the outside through the light channel 431, thus not affecting the display of the electronic paper display panel 30.

[0036] For example, in certain specific scenarios, the second substrate 700 can switch between light transmission and opacity by controlling the state of the light valve structure 610 at a fixed time, such as when the external ambient light is relatively bright for a fixed period of time and relatively dark for a fixed period of time.

[0037] At this time, the second substrate 700 can control the state of the light valve structure 610 to transmit light during a relatively bright period of time when the external ambient light is fixed, and the second substrate 700 can control the state of the light valve structure 610 to not transmit light during a relatively dark period of time when the external ambient light is fixed.

[0038] For example, the electronic paper display panel 30 further includes a light sensing module and a control module. The light sensing module is connected to the control module, and the control module is connected to the second substrate 700. By pre-setting a brightness threshold, when the light sensor detects that the external light brightness exceeds the brightness threshold, the control module controls the light valve structure 610 to be transparent through the second substrate 700; when the light sensor detects that the external light brightness is lower than the brightness threshold, the control module controls the light valve structure 610 to be opaque through the second substrate 700.

[0039] Since the photoluminescent structure 300 of this application is disposed on the inner wall of the microcup 141, the lateral thickness of the photoluminescent structure 300 is less than the lateral thickness of the microcup 141. The corresponding light channel 431 is also located between the two microcups 141, and its thickness is also less than the lateral thickness of the microcup 141. This results in a limited amount of light received by the photoluminescent structure 300. Therefore, this application addresses this by setting a light-concentrating structure 500 within the light channel 431. Specifically: Figure 5 This is a schematic diagram of a light-concentrating structure according to the first embodiment of this application, combined with... Figure 5 As shown, the electronic paper display panel 30 also includes a light-concentrating structure 500, which is disposed within the light channel 431 and is used to focus external light onto the photoluminescent structure 300.

[0040] It is understood that the light-concentrating structure 500 is located above the photoluminescent structure 300. By setting the light-concentrating structure 500 in the light channel 431, the light-concentrating structure 500 can focus the light on the photoluminescent structure 300, thereby increasing the light intensity per unit area and avoiding insufficient energy storage of the photoluminescent structure 300.

[0041] For example, the light-concentrating structure 500 includes a left light-concentrating part 510, a middle light-concentrating part 520, and a right light-concentrating part 530. The cross-sectional shape of the middle light-concentrating part 520 is semi-elliptical, the cross-sectional shape of the left light-concentrating part 510 is triangular, and the cross-sectional shape of the right light-concentrating part 530 is triangular. The left light-concentrating part 510 refracts light downwards towards the middle light-concentrating part 520, and the right light-concentrating part 530 refracts light downwards towards the middle light-concentrating part 520, thereby concentrating light onto the photoluminescent structure 300 below.

[0042] Figure 6 This is a schematic diagram of a color resist layer according to the first embodiment of this application, combined with... Figure 6 As shown, in this embodiment, the electronic paper display panel 30 further includes a color resist layer 420, which is disposed on the side of the microcup barrier 140 away from the first substrate 110. The color resist layer 420 includes a first color resist 421, a second color resist 422, and a third color resist 423. The microcup 141 corresponding to the first color resist 421 is defined as the first microcup 151, the microcup 141 corresponding to the second color resist 422 is defined as the second microcup 152, and the microcup 141 corresponding to the third color resist 423 is defined as the third microcup 153.

[0043] The photoluminescent structure 300 within the first microcup 151 is defined as the first photoluminescent structure 310, the photoluminescent structure 300 within the second microcup 152 is defined as the second photoluminescent structure 320, and the photoluminescent structure 300 within the third microcup 153 is defined as the third photoluminescent structure 330.

[0044] The light emitted by the first photoluminescent structure 310 is red, the light emitted by the second photoluminescent structure 320 is green, and the light emitted by the third photoluminescent structure 330 is blue, the light emitted by the third photoluminescent structure 423 is blue.

[0045] For example, the color resist layer 420 and the light channel layer 430 are disposed in the same layer. The first color resist 421, the second color resist 422 and the third color resist 423 of the color resist layer 420 are all located above the microcup 141, and the light channel 431 of the light channel layer 430 is located above the gap between the two microcup 141.

[0046] It is understood that, in order to avoid the problem of light mixing, the microcup barrier 140 in this embodiment is made of an opaque material. Alternatively, the microcup barrier 140 can be made of a reflective material, so that the light emitted by the first photoluminescent structure 310, the second photoluminescent structure 320 and the third photoluminescent structure 330 will be reflected and utilized by the microcup barrier 140 in their respective microcup 141, and will not penetrate the microcup barrier 140.

[0047] The light emitted by the first photoluminescent structure 310 is red, the light emitted by the second photoluminescent structure 320 is green, and the light emitted by the third photoluminescent structure 330 is blue, achieving color display of the electronic paper display panel 30.

[0048] For example, the material of the first photoluminescent structure 310 includes Y2O2S:Eu³ + ,Mg² + Ti 4+ Or SrGa2O4:Cu² + The first photoluminescent structure uses yttrium oxysulfate as a substrate, doped with europium for red light emission, and further doped with magnesium and titanium or strontium gallate as a substrate, doped with divalent copper ions as the light-emitting center; the second photoluminescent structure 320 is made of SrAl2O4:Eu²⁻. + ,Dy³ + Specifically, it uses strontium aluminate as a substrate, doped with divalent europium as a green light source, and doped with dysprosium ions; the material of the third photoluminescent structure 330 includes CaAl2O4:Eu²⁺. + ,Nd³ + That is, calcium aluminate is used as the matrix and divalent europium is used as the blue light source, and neodymium ions are doped.

[0049] Because the light-emitting particles of the second photoluminescent structure 320 (i.e., the green photoluminescent material) have a moderate trap depth and high quantum efficiency, they absorb energy quickly and emit light strongly; the light-emitting particles of the first photoluminescent structure 310 (i.e., the red photoluminescent material) have a deeper trap, absorb energy slowly, and emit light slowly and weakly; while the light-emitting particles of the third photoluminescent structure 330 (i.e., the blue photoluminescent material) are located between the green and red photoluminescent materials; in order to avoid abnormal grayscale phenomena in the electronic paper display panel 30 due to inconsistent afterglow brightness of the first, second, and third photoluminescent structures 310, the second, and third photoluminescent structures 320, this application controls the difference between each pair of afterglow brightness of the first, second, and third photoluminescent structures 330 to be less than a preset brightness difference.

[0050] For example, the preset brightness difference value is 5%.

[0051] That is, the relative brightness difference between the afterglow brightness of the first photoluminescent structure 310 and the afterglow brightness of the second photoluminescent structure 320 is less than 5%, the relative brightness difference between the afterglow brightness of the second photoluminescent structure 320 and the afterglow brightness of the third photoluminescent structure 330 is less than 5%, and the relative brightness difference between the afterglow brightness of the first photoluminescent structure 310 and the afterglow brightness of the third photoluminescent structure 330 is less than 5%.

[0052] Figure 7 This is a schematic diagram of a light valve structure according to the first embodiment of this application. Figure 8 yes Figure 7 A partially enlarged schematic diagram, combined with Figure 7 and Figure 8 As shown, for example, the transmittance of the controllable light-shielding layer 600 can be controlled to make the difference between each pair of the afterglow brightness of the first photoluminescent structure 310, the second photoluminescent structure 320, and the third photoluminescent structure 330 less than a preset brightness difference. That is, the electronic paper display panel 30 further includes a second substrate 700 and a controllable light-shielding layer 600. The controllable light-shielding layer 600 and the second substrate 700 are sequentially disposed on the side of the light channel layer 430 away from the first substrate 110. The controllable light-shielding layer 600 includes a plurality of light valve structures 610. The light valve structures 610 are correspondingly disposed with the light channel 431. The second substrate 700 is used to control the state of the light valve structures 610 to switch between light transmission and light opacity. The light valve structure 610 includes an anode control layer 611, a cathode control layer 612, a first electrochromic layer 621, a second electrochromic layer 622, and a third electrochromic layer 623. The first electrochromic layer 621 corresponds to the first photoluminescent structure 310, the second electrochromic layer 622 corresponds to the second photoluminescent structure 320, and the third electrochromic layer 623 corresponds to the third photoluminescent structure 330. The anode control layer 611 and the cathode control layer 612 are respectively located close to the second substrate 700 and away from the second substrate 700 on the sides of the first electrochromic layer 621, the second electrochromic layer 622, and the third electrochromic layer 623.

[0053] Understandably, the first electrochromic layer 621 is above the first photoluminescent structure 310, and light passing through the first electrochromic layer 621 illuminates the first photoluminescent structure 310; the second electrochromic layer 622 is above the second photoluminescent structure 320, and light passing through the second electrochromic layer 622 illuminates the second photoluminescent structure 320; the third electrochromic layer 623 is above the third photoluminescent structure 330, and light passing through the third electrochromic layer 623 illuminates the third photoluminescent structure 330.

[0054] Under the same voltage, the transmittance of the second electrochromic layer 622, the transmittance of the third electrochromic layer 623, and the transmittance of the first electrochromic layer 621 increase sequentially.

[0055] For example, the second substrate 700 includes a second substrate 710 and a second active switching layer 720. The second active switching layer 720 is disposed on the second substrate 710, and a second active switch 721 in the second active switching layer 720 is connected to the anode control layer 611.

[0056] By increasing the transmittance of the second electrochromic layer 622, the third electrochromic layer 623, and the first electrochromic layer 621 sequentially under the same voltage, the energy received by the second photoluminescent structure 320, the third photoluminescent structure 330, and the first photoluminescent structure 310 gradually increases when energy is stored in them. This results in the afterglow intensity of the second photoluminescent structure 320, the third photoluminescent structure 330, and the first photoluminescent structure 310 approaching each other, thereby reducing the control difficulty during display and improving the uniformity of the display image of the electronic paper display panel 30.

[0057] By adjusting the thicknesses of the first photoluminescent structure 310, the second photoluminescent structure 320, and the third photoluminescent structure 330, such as by decreasing the thicknesses of the second photoluminescent structure 320, the third photoluminescent structure 330, and the first photoluminescent structure 310 in sequence, the transmittance of the second electrochromic layer 622, the transmittance of the third electrochromic layer 623, and the transmittance of the first electrochromic layer 621 can be increased in sequence under the same voltage.

[0058] For example, the number of light-emitting particles in the first photoluminescent structure 310 can be greater than the number of light-emitting particles in the third photoluminescent structure 330, and the number of light-emitting particles in the second photoluminescent structure 320 can be less than the number of light-emitting particles in the third photoluminescent structure 330.

[0059] For example, with the same concentration of luminescent particles, the thickness of the first photoluminescent structure 310 can be greater than the thickness of the third photoluminescent structure 330, so that the number of luminescent particles in the first photoluminescent structure 310 is greater than the number of luminescent particles in the third photoluminescent structure 330; and the thickness of the second photoluminescent structure 320 can be less than the thickness of the third photoluminescent structure 330, so that the number of luminescent particles in the second photoluminescent structure 320 is less than the number of luminescent particles in the third photoluminescent structure 330.

[0060] For example, with the same thickness and area, the number of light-emitting particles in the first photoluminescent structure 310 can be greater than the number of light-emitting particles in the third photoluminescent structure 330 by having a higher concentration of light-emitting particles in the first photoluminescent structure 310 than in the third photoluminescent structure 330; and the number of light-emitting particles in the second photoluminescent structure 320 can be less than the number of light-emitting particles in the third photoluminescent structure 330 by having a lower concentration of light-emitting particles in the second photoluminescent structure 320 than in the third photoluminescent structure 330.

[0061] Of course, besides controlling the difference between the afterglow brightness of the first photoluminescent structure 310, the afterglow brightness of the second photoluminescent structure 320, and the afterglow brightness of the third photoluminescent structure 330 to be less than a preset brightness difference, it is also possible to compensate for the problem of inconsistent long afterglow light intensity between the second photoluminescent structure 320, the third photoluminescent structure 330, and the first photoluminescent structure 310 by controlling the driving voltage of the pixel electrode 132. Specifically: Figure 9 This is a schematic diagram of a voltage compensation module according to the first embodiment of this application, as shown below. Figure 9 As shown, the electronic paper display device 10 of this application further includes a voltage compensation module 40. The input terminal of the voltage compensation module 40 is connected to the driving circuit 20, and the output terminal of the voltage compensation module 40 is connected to the first substrate 110 in the electronic paper display panel 30. The voltage compensation module 40 is used to receive an initial driving voltage, which is a voltage applied to the pixel electrode 132, and to determine whether the initial driving voltage corresponds to the first microcup 151, the second microcup 152, or the third microcup 153.

[0062] The initial driving voltage corresponding to the first microcup 151 can be defined as the first initial driving voltage, the initial driving voltage corresponding to the second microcup 152 can be defined as the second initial driving voltage, and the initial driving voltage corresponding to the third microcup 153 can be defined as the third initial driving voltage; the first compensation voltage is stored in the first microcup 151, and the second compensation voltage is stored in the second microcup 152.

[0063] Then, a second compensation voltage is applied corresponding to the second initial voltage to control the opening in the second microcup 152 to decrease; a first compensation voltage is applied corresponding to the first initial voltage to control the opening in the first microcup 151 to increase. This improves the uniformity of the display image on the electronic paper display panel 30 while reducing the manufacturing difficulty of the electronic paper display panel 30.

[0064] Example 2: Figure 10 This is a schematic diagram of an electronic paper display panel according to a second embodiment of this application, as shown below. Figure 10 As shown, unlike the first embodiment, the photoluminescent structure 300 in this embodiment emits white light.

[0065] Specifically, the electronic paper display panel 30 includes a first substrate 110, a microcup barrier 140, a light reflection control structure 200, a photoluminescent structure 300, a common electrode layer 410, and a light channel layer 430. The microcup barrier 140 is disposed on the first substrate 110 and defines a plurality of microcups 141. The light reflection control structure 200 is located inside the microcups 141. The photoluminescent structure 300 is disposed on the inner wall of the microcup barrier 140. The light channel layer 430 is disposed on the side of the microcup barrier 140 away from the first substrate 110. The common electrode layer 410 is located between the light channel layer 430 and the microcup barrier 140. The light channel layer 430 includes a plurality of light channels 431, which correspond to the photoluminescent structure 300. The first substrate 110 is used to control the light reflection control structure 200 to reflect or absorb light.

[0066] The electronic paper display panel 30 further includes a color resist layer 420, which is disposed on the side of the microcup barrier 140 away from the first substrate 110. The color resist layer 420 includes a first color resist 421, a second color resist 422, and a third color resist 423. The microcup 141 corresponding to the first color resist 421 is defined as the first microcup 151, the microcup 141 corresponding to the second color resist 422 is defined as the second microcup 152, and the microcup 141 corresponding to the third color resist 423 is defined as the third microcup 153.

[0067] The photoluminescent structure 300 within the first microcup 151 is defined as the first photoluminescent structure 310, the photoluminescent structure 300 within the second microcup 152 is defined as the second photoluminescent structure 320, and the photoluminescent structure 300 within the third microcup 153 is defined as the third photoluminescent structure 330.

[0068] The first color resist 421 is red, the second color resist 422 is green, and the third color resist 423 is blue. The light emitted by the first photoluminescent structure 310, the second photoluminescent structure 320, and the third photoluminescent structure 330 is white.

[0069] Compared to the solution in the first embodiment, the light emitted by the first photoluminescent structure 310, the second photoluminescent structure 320, and the third photoluminescent structure 330 in this application is all white. Therefore, the materials of the first photoluminescent structure 310, the second photoluminescent structure 320, and the third photoluminescent structure 330 are the same, thereby avoiding the problem of different afterglow light intensities of the first photoluminescent structure 310, the second photoluminescent structure 320, and the third photoluminescent structure 330, and improving the uniformity of the display screen of the electronic paper display panel 30.

[0070] Figure 11 This is a process diagram illustrating a method for manufacturing an electronic paper display panel according to an embodiment of this application. Figure 12 This is a schematic flowchart illustrating a method for fabricating an electronic paper display panel according to an embodiment of this application. Figure 11 and Figure 12 As shown, this application also discloses a method for preparing an electronic paper display panel 30. The method for preparing the electronic paper display panel 30 includes the following steps: S1: A microcup barrier is formed on a first substrate, the microcup barrier defining a plurality of microcups; S2: A photoluminescent structure is provided on the inner wall of the microcup baffle; S3: A light reflection control structure is provided inside the microcup; For example, the light reflection control structure 200 includes a reflective layer 210, a hydrophobic layer 220, and an electrophoretic ink 230.

[0071] S4: A common electrode layer is formed on the light channel layer, the light channel layer including multiple light channels, the light channels corresponding to the photoluminescent structure, to form an opposing substrate; S5: The opposing substrate is encapsulated in the microcup baffle.

[0072] By providing a photoluminescent structure 300 on the side wall of the microcup 141 and a light channel 431 on the top of the photoluminescent structure 300, when the ambient light is bright, external light can directly shine through the light channel 431 onto the photoluminescent structure 300 below, thereby realizing the energy storage of the photoluminescent structure 300. This improves the uniformity of the display image of the electronic paper display panel 30 after the ambient light dims, thus improving the display effect of the electronic paper display panel 30.

[0073] Figure 13 This is a schematic diagram of the fabrication process of a controllable light-shielding layer according to an embodiment of this application. Figure 14a This is a partial flowchart illustrating a method for preparing a controllable light-shielding layer according to an embodiment of this application. Figure 14b This is a schematic diagram of the remaining part of a method for preparing a controllable light-shielding layer according to an embodiment of this application, combined with... Figures 13-14b As shown.

[0074] Step S4: Forming a common electrode layer on the light channel layer, wherein the light channel layer includes multiple light channels, and the light channels correspond to the photoluminescent structure, to form the opposing substrate includes: S41: A controllable light-shielding layer is formed on the second substrate, the controllable light-shielding layer including multiple light valve structures; S42: A light channel layer is formed on the controllable light-shielding layer. The light channel layer includes multiple light channels. The light valve structure is arranged correspondingly to the light channels. The light channels are arranged correspondingly to the photoluminescent structure. The inner wall of the light channel 431, as an example, can be made of opaque materials such as BM material.

[0075] S43: A common electrode layer is formed on the optical channel layer to form a counter substrate.

[0076] Furthermore, between step S42: forming a light channel layer on the controllable light-shielding layer, the light channel layer including multiple light channels, the light valve structure corresponding to the light channels, and the light channels corresponding to the photoluminescent structure, and step S43: forming a common electrode layer on the light channel layer to form a counter substrate, the following may also be included: S421: A light-focusing structure is set within the light channel.

[0077] It is understood that the light channel 431 is located above the photoluminescent structure 300, and the light valve structure 610 is located on the light channel 431. In this way, the state of the light valve structure 610 is controlled by the second substrate 700 to switch between light transmission and light opacity.

[0078] When the ambient light is bright, the second substrate 700 controls the light valve structure 610 to be transparent, allowing external light to pass through the light valve structure 610 and the light channel 431 and illuminate the photoluminescent structure 300, whereby the photoluminescent structure 300 stores energy. When the ambient light is bright, the second substrate 700 controls the light valve structure 610 to be opaque, preventing external light from passing through the light valve structure 610 and the light channel 431 and illuminating the photoluminescent structure 300. The long afterglow emitted by the photoluminescent structure 300 will not be directly emitted to the outside through the light channel 431, thus not affecting the display of the electronic paper display panel 30.

[0079] For example, in certain specific scenarios, the second substrate 700 can switch between light transmission and opacity by controlling the state of the light valve structure 610 at regular intervals. For instance, when the external ambient light is relatively bright for a fixed period of time and relatively dark for another fixed period of time, the second substrate 700 can control the state of the light valve structure 610 at regular intervals to transmit light during the period when the external ambient light is relatively bright and to opaque during the period when the external ambient light is relatively dark.

[0080] For example, the electronic paper display panel 30 further includes a light sensing module and a control module. The light sensing module is connected to the control module, and the control module is connected to the second substrate 700. By pre-setting a brightness threshold, when the light sensor detects that the external light brightness exceeds the brightness threshold, the control module controls the light valve structure 610 to be transparent through the second substrate 700; when the light sensor detects that the external light brightness is lower than the brightness threshold, the control module controls the light valve structure 610 to be opaque through the second substrate 700.

[0081] 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.

[0082] 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.

[0083] 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 in that, The electronic paper display panel includes a first substrate, a microcup barrier, a light reflection control structure, a photoluminescent structure, a common electrode layer, and a light channel layer. The microcup barrier is disposed on the first substrate and defines a plurality of microcups. The light reflection control structure is located inside the microcups. The photoluminescent structure is disposed on the inner wall of the microcup barrier. The light channel layer is disposed on the side of the microcup barrier away from the first substrate. The common electrode layer is located between the light channel layer and the microcup barrier. The light channel layer includes a plurality of light channels, which correspond to the photoluminescent structure. The first substrate is used to control the light reflection control structure to reflect or absorb light.

2. The electronic paper display panel according to claim 1, characterized in that, The electronic paper display panel further includes a second substrate and a controllable light-shielding layer. The controllable light-shielding layer and the second substrate are sequentially disposed on the side of the light channel layer away from the first substrate. The controllable light-shielding layer includes a plurality of light valve structures, which are disposed corresponding to the light channel. The second substrate is used to control the state of the light valve structures to switch between light transmission and light opacity.

3. The electronic paper display panel according to claim 2, characterized in that, The electronic paper display panel also includes a light-concentrating structure disposed within the light channel, which is used to focus external light onto the photoluminescent structure.

4. The electronic paper display panel according to claim 1, characterized in that, The electronic paper display panel further includes a color resist layer, which is disposed on the side of the microcup barrier away from the first substrate; the color resist layer includes a first color resist, a second color resist, and a third color resist, and the microcup corresponding to the first color resist is defined as the first microcup, the microcup corresponding to the second color resist is defined as the second microcup, and the microcup corresponding to the third color resist is defined as the third microcup; The photoluminescent structure in the first microcup is defined as the first photoluminescent structure, the photoluminescent structure in the second microcup is defined as the second photoluminescent structure, and the photoluminescent structure in the third microcup is defined as the third photoluminescent structure. The light emitted by the first photoluminescent structure is red, the light emitted by the second photoluminescent structure is green, and the light emitted by the third photoluminescent structure is blue.

5. The electronic paper display panel according to claim 4, characterized in that, The difference between each pair of the afterglow brightness of the first photoluminescent structure, the afterglow brightness of the second photoluminescent structure, and the afterglow brightness of the third photoluminescent structure is less than a preset brightness difference.

6. The electronic paper display panel according to claim 5, characterized in that, The number of light-emitting particles in the first photoluminescent structure is greater than the number of light-emitting particles in the third photoluminescent structure, and the number of light-emitting particles in the second photoluminescent structure is less than the number of light-emitting particles in the third photoluminescent structure.

7. The electronic paper display panel according to claim 5, characterized in that, The electronic paper display panel further includes a second substrate and a controllable light-shielding layer. The controllable light-shielding layer and the second substrate are sequentially disposed on the side of the light channel layer away from the first substrate. The controllable light-shielding layer includes a plurality of light valve structures, which are disposed corresponding to the light channel. The second substrate is used to control the state of the light valve structures to switch between light transmission and light opacity. The light valve structure includes an anode control layer, a cathode control layer, a first electrochromic layer, a second electrochromic layer, and a third electrochromic layer. The first electrochromic layer corresponds to the first photoluminescent structure, the second electrochromic layer corresponds to the second photoluminescent structure, and the third electrochromic layer corresponds to the third photoluminescent structure. The anode control layer and the cathode control layer are respectively located close to the second substrate and away from the second substrate on the sides of the first electrochromic layer, the second electrochromic layer, and the third electrochromic layer. Under the same voltage, the transmittance of the second electrochromic layer, the transmittance of the third electrochromic layer, and the transmittance of the first electrochromic layer increase sequentially.

8. A method for preparing an electronic paper display panel, characterized in that, The method for preparing the electronic paper display panel is used to prepare the electronic paper display panel as described in any one of claims 1-7, and the method for preparing the electronic paper display panel includes the following steps: Microcup walls are formed on a first substrate, the microcup walls defining a plurality of microcup; A photoluminescent structure is provided on the inner wall of the microcup baffle; A light reflection control structure is provided inside the microcup; A common electrode layer is formed on the optical channel layer, the optical channel layer including multiple optical channels, the optical channels corresponding to the photoluminescent structure, to form an opposing substrate; The opposing substrate is encapsulated in the microcup barrier.

9. The method for preparing an electronic paper display panel according to claim 8, characterized in that, The step of forming a common electrode layer on the optical channel layer, wherein the optical channel layer includes multiple optical channels corresponding to the photoluminescent structure, to form a counter substrate includes: A controllable light-shielding layer is formed on a second substrate, the controllable light-shielding layer including multiple light valve structures; A light channel layer is formed on the controllable light-shielding layer. The light channel layer includes multiple light channels. The light valve structure is configured correspondingly to the light channels. The light channels are configured correspondingly to the photoluminescent structure. A common electrode layer is formed on the optical channel layer to form a counter substrate.

10. An electronic paper display device, characterized in that, The electronic paper display device includes a driving circuit and an electronic paper display panel as described in any one of claims 1-7, wherein the driving circuit is connected to the electronic paper display panel.

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