Electrophoresis display panel and electrophoresis display device

Abstract

This application belongs to the field of display technology, specifically relating to electrophoretic display panels and electrophoretic display devices. The electrophoretic display panel includes an electronic ink layer and a first substrate and a second substrate disposed opposite to each other. The first substrate and the second substrate are respectively provided with a first electrode and a second electrode. The electronic ink layer includes multiple electronic ink units, each of which includes a shell and a dispersion liquid, black particles, color-developing particles, and conversion particles encapsulated within the shell. In display mode: under the action of the electric field force of the driving electric field, the color-developing particles move towards the light-transmitting side, the black particles move away from the light-transmitting side, and the conversion particles are located between the color-developing particles and the black particles. The color-developing particles can filter external light to obtain monochromatic light and ultraviolet light, and the conversion particles can convert ultraviolet light into visible light, reflecting the monochromatic light and visible light back to the color-developing particles and emitting them from the light-transmitting side. This application's solution can enhance display brightness.

Description

Technical Field

[0001] This application belongs to the field of display technology, specifically relating to an electrophoretic display panel and an electrophoretic display device. Background Technology

[0002] With the advancement of flat panel display technology, more and more electronic products are equipped with display devices, especially portable electronic products such as mobile phones, e-readers, and digital cameras. As portable electronic products are trending towards being lightweight, small in size, and thin, the display devices used in portable electronic products also need to have the advantages of being lightweight, small in size, and thin.

[0003] To promote paperless technology, electronic billboards, such as electrophoretic displays (EPDs) or electronic paper displays (EPDs), can replace traditional printed billboards. Electronic billboards are not only lightweight and thin, but can also be designed to be flexible.

[0004] Common electronic paper display (EPD) technology employs either electrophoretic E-link capsule-type or electrophoretic SiPix microcup-type electronic ink display technology. Both structures contain suspended colored particles with varying positive and negative charges. Under the influence of an electric field, these charged particles move towards electrodes of opposite polarity. EPD technology primarily displays light through the reflection or absorption of ambient light, resulting in relatively low brightness in dark environments. Summary of the Invention

[0005] The purpose of this application is to provide an electrophoretic display panel and an electrophoretic display device that can enhance display brightness.

[0006] A first aspect of this application provides an electrophoretic display panel, including a first substrate and a second substrate disposed opposite to each other. A first electrode and a second electrode are respectively disposed on the first substrate and the second substrate, and the first electrode and the second electrode are disposed opposite to each other, forming a driving electric field between the first electrode and the second electrode. The first substrate or the second substrate is a light-transmitting side. The electrophoretic display panel further includes:

[0007] An electronic ink layer is disposed between the first substrate and the second substrate. The electronic ink layer includes a plurality of electronic ink units. Each electronic ink unit includes a shell and a dispersion liquid, black particles, color developing particles and conversion particles encapsulated in the shell. The black particles and the color developing particles are charged, and the charge of the black particles is opposite to that of the color developing particles.

[0008] The electrophoretic display panel includes a display mode. In the display mode, under the action of the electric field force of the driving electric field, the color-developing particles move towards the light-transmitting side, the black particles move away from the light-transmitting side, and the conversion particles are located between the color-developing particles and the black particles. The color-developing particles can filter external light to obtain monochromatic light and ultraviolet light, and the conversion particles can convert the ultraviolet light into visible light, reflect the monochromatic light and the visible light back to the color-developing particles, and emit them from the light-transmitting side.

[0009] In one exemplary embodiment of this application, the conversion particles are uncharged; the spherical colored particles, the black particles, and the conversion particles are distributed in the dispersion.

[0010] Under the influence of the electric field force of the driving electric field, the color particles and the black particles move toward different substrates respectively, and the conversion particles are located in the middle of the electronic ink unit.

[0011] In one exemplary embodiment of this application, the hemispherical color-developing particles and the hemispherical conversion particles are integrally formed;

[0012] Under the influence of the electric field force of the driving electric field, the hemispherical conversion particles move along with the hemispherical color-developing particles.

[0013] In one exemplary embodiment of this application, the converted particles are uncharged.

[0014] In one exemplary embodiment of this application, the conversion particles have the same electrical charge as the colorimetric particles, and the charge of the conversion particles is less than the charge of the colorimetric particles.

[0015] In one exemplary embodiment of this application, the conversion particles and the color-developing particles carry the same charge and electrical charge, and the density of the conversion particles is greater than the density of the color-developing particles.

[0016] In one exemplary embodiment of this application, the transformed particles include gelatin and deoxyribonucleic acid.

[0017] In one exemplary embodiment of this application, the first substrate is the light-transmitting side, and the first electrode is a light-transmitting electrode.

[0018] In one exemplary embodiment of this application, the electronic ink layer includes at least one of red electronic ink units, green electronic ink units, and blue electronic ink units, wherein the color-developing particles in the red electronic ink unit are red particles, the color-developing particles in the green electronic ink unit are green particles, and the color-developing particles in the blue electronic ink unit are blue particles.

[0019] A second aspect of this application provides an electrophoresis display device, comprising:

[0020] Motherboard, and

[0021] In any of the above-described electrophoretic display panels, the first electrode and the second electrode are electrically connected to the motherboard.

[0022] The electrophoresis display panel and electrophoresis display device of this application have at least the following beneficial effects:

[0023] The electrophoretic display panel of this application includes a first substrate, a second substrate, and an electronic ink layer sandwiched between them. A first electrode and a second electrode are respectively disposed on the first and second substrates, and a driving electric field can be formed between the first and second electrodes. The first or second substrate is the light-transmitting side, meaning that external light can pass through the first or second substrate and enter the electronic ink layer. The electronic ink layer includes multiple electronic ink units, each of which includes a shell and a dispersion liquid, black particles, color-developing particles, and conversion particles encapsulated within it. Both the black particles and the color-developing particles are charged, and the charge of the black particles is opposite to that of the color-developing particles. The electrophoretic display panel includes a display mode. In the display mode: under the action of the electric field force of the driving electric field, the color-developing particles move towards the light-transmitting side, the black particles move away from the light-transmitting side, and the conversion particles are located between the color-developing particles and the black particles. The color-developing particles can filter external light to obtain monochromatic light and ultraviolet light, and the conversion particles can convert ultraviolet light into visible light, reflecting the monochromatic light and visible light back to the color-developing particles and emitting them from the light-transmitting side. Compared to existing technologies that only emit monochromatic light from the substrate side, this application's solution increases the emission of visible light from the substrate side, thereby increasing the amount of light emitted from the substrate side. This enhances the display brightness of the electrophoretic display panel, improving its brightness in dark environments and ultimately increasing the overall brightness of the electrophoretic display device. Furthermore, the stronger the ultraviolet light, the more visible light is converted by the conversion particles, resulting in a greater amount of light emanating from the light-transmitting side and a more significant brightness enhancement effect on the electrophoretic display panel. In addition, utilizing conversion particles to convert ultraviolet light into visible light reduces the long-term exposure of the internal components of the electrophoretic display panel to ultraviolet light, preventing aging and overheating caused by prolonged ultraviolet absorption and effectively extending the lifespan of the internal components.

[0024] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0025] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that 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 inventive effort.

[0027] Figure 1 A schematic diagram of the electrophoretic display panel structure provided in Embodiment 1 or Embodiment 3 of this application is shown.

[0028] Figure 2 A schematic diagram of the electronic ink unit provided in Embodiment 1 or Embodiment 3 of this application is shown.

[0029] Figure 3 This shows a schematic diagram of the electrophoretic display panel provided in Embodiment 1 or Embodiment 3 of this application in a black state.

[0030] Figure 4 A schematic diagram of the electrophoresis display panel provided in Embodiment 1 or Embodiment 3 of this application in display mode is shown.

[0031] Figure 5 A schematic diagram of the electronic ink unit provided in Embodiment 2 or Embodiment 3 of this application is shown.

[0032] Figure 6 This diagram illustrates the structure of the electrophoretic display panel provided in Embodiment 2 or Embodiment 3 of this application in a black state.

[0033] Figure 7 This illustration shows a schematic diagram of the electrophoresis display panel provided in Embodiment 2 or Embodiment 3 of this application in display mode.

[0034] Figure 8 A schematic diagram of the connection between the motherboard and the first and second electrodes provided in Embodiment 3 is shown.

[0035] Explanation of reference numerals in the attached figures:

[0036] 10. Electrophoretic display device; 100. Electrophoretic display panel; 110. First substrate; 111. First electrode; 120. Second substrate; 121. Second electrode; 130. Electronic ink layer; 131. Electronic ink unit; 1310. Housing; 1311. Black particles; 1312. Color developing particles; 1313. Conversion particles; 200. Main board. Detailed Implementation

[0037] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0038] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0039] In this application, unless otherwise expressly specified and limited, the terms "assembly," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0041] Example 1

[0042] See Figure 1 As shown, Embodiment 1 of this application provides an electrophoretic display panel 100, which includes a first substrate 110 and a second substrate 120 disposed opposite to each other, and an electronic ink layer 130 located between the first substrate 110 and the second substrate 120.

[0043] Both the first substrate 110 and the second substrate 120 can be glass substrates, but are not limited to them. They can also be substrates made of other materials, such as polyimide (PI) material, etc.

[0044] In some embodiments of this application, see Figure 1As shown, a first electrode layer is provided on the side of the first substrate 110 facing the second substrate 120, and the first electrode layer includes a first electrode 111. The first electrode 111 can be provided on the entire surface; it can also be a block electrode, that is, the first electrode layer can include multiple first electrode blocks, and adjacent first electrode blocks are spaced apart from each other.

[0045] Accordingly, see Figure 1 As shown, a second electrode layer is provided on the side of the second substrate 120 facing the first substrate 110, and the second electrode layer includes a second electrode 121. The second electrode 121 can be provided on the entire surface; it can also be a block electrode, that is, the second electrode layer can include multiple second electrode blocks, and adjacent second electrode blocks are spaced apart from each other.

[0046] It is understandable that when different voltages are applied to the first electrode 111 and the second electrode 121, a driving electric field will be generated between the first electrode 111 and the second electrode 121. The driving electric field has an electric field direction. When the voltages of the first electrode 111 and the second electrode 121 are switched, the electric field direction of the driving electric field can be switched.

[0047] In addition, light can enter or exit through the first substrate 110 or the second substrate 120, thereby realizing the display or shutdown of the electrophoretic display panel 100, that is, the side of the first substrate 110 or the second substrate 120 is the light transmission side.

[0048] In some embodiments of this application, the first substrate 110 is the light-transmitting side, and external light will pass through the first substrate 110 and enter the electronic ink layer 130, and the electronic ink layer 130 will reflect the light back to the first substrate 110 and emit it.

[0049] In some embodiments of this application, see Figure 1 and Figure 2 As shown, the electronic ink layer 130 includes a plurality of electronic ink units 131, which are spaced apart from each other or may be adjacent to each other. Each electronic ink unit 131 includes a shell 1310 and a dispersion liquid, black particles 1311, color developing particles 1312, and conversion particles 1313 encapsulated within the shell 1310. The black particles 1311 and the color developing particles 1312 are both charged, and the charge of the black particles 1311 is opposite to that of the color developing particles 1312.

[0050] Among them, see Figure 3 and Figure 4As shown, the electrophoretic display panel 100 includes a black mode and a display mode. In the black mode, under the action of the electric field force of the driving electric field, black particles 1311 move towards the first substrate 110, and color particles 1312 are located on the side of the black particles 1311 away from the first substrate 110. The black particles 1311 can absorb the light passing through the first substrate 110 and appear black. In the display mode, under the action of the electric field force of the driving electric field, color particles 1312 move towards the light-injecting side, and black particles 1311 move towards the side away from the light-injecting side. Conversion particles 1313 are located between the color particles 1312 and the black particles 1311.

[0051] It should be noted that the color-developing particles 1312 can filter external light into ultraviolet light and monochromatic light. The color of this monochromatic light is the same as the color of the color-developing particles 1312, allowing it to pass through the color-developing particles 1312. The mixed light of ultraviolet light and monochromatic light is directed towards the conversion particles 1313, which can convert ultraviolet light into visible light and reflect both monochromatic and visible light. In other words, when external light passes through the color-developing particles 1312 near the first substrate 110, it is filtered into a mixed light of monochromatic light and ultraviolet light. After the monochromatic light and ultraviolet light enter the conversion particles 1313, the ultraviolet light is converted into visible light and reflected back to the color-developing particles 1312 along with the monochromatic light. The visible light, after passing through the color-developing particles 1312, displays the same color as the display particles. Combined with the original monochromatic light, this increases the amount of light emitted from the first substrate 110 side, thereby improving the display brightness of the electrophoretic display panel 100 and enhancing viewing brightness in dark environments.

[0052] In addition, by using conversion particles 1313 to convert ultraviolet light into visible light, the long-term exposure of ultraviolet light to the internal equipment of the electrophoretic display panel 100 can be reduced, avoiding problems such as aging and overheating caused by long-term absorption of ultraviolet light by the internal equipment of the electrophoretic display panel 100, and effectively extending its service life.

[0053] It is worth mentioning that the electronic ink unit 131 can be a microcapsule structure or a microcup structure. That is, the cross-sectional shape of the outer shell 1310 of the electronic ink unit 131 can be circular, square, or trapezoidal.

[0054] In some embodiments of this application, the electronic ink unit 131 includes a light conversion layer comprising a plurality of conversion particles 1313. The conversion particles 1313 are light-converting silicone spheres, comprising polymers and biomass aerogel spheres prepared from gelatin (GE) and deoxyribonucleic acid (DNA), wherein the polymer is used to coat or modify the biomass aerogel spheres.

[0055] It is worth mentioning that modification and coating can be performed using physical or chemical methods. Physical methods include grinding and spraying. Chemical methods include coagulation, emulsion polymerization, or dispersion polymerization; in these methods, the polymer uses styrene (St) as a monomer and then introduces other different substances for polymerization.

[0056] It should be noted that the conversion particles 1313 can be charged or uncharged, as long as they can satisfy the condition that when the color-developing particles 1312 are close to the first substrate 110, the conversion particles 1313 are located between the color-developing particles 1312 and the black particles 1311.

[0057] It should be understood that when the conversion particle 1313 is charged, its charge is less than that of the particles with the same charge, so that it can be located between the black particle 1311 and the color-developing particle 1312, so that it can better absorb ultraviolet light and better convert ultraviolet light into visible light and reflect it back to the color-developing particle 1312.

[0058] Furthermore, the charge of the transformed particles 1313 can be achieved by polymer coating or modification of biomass aerogel spheres, where the charge can be applied to the outer edge of the polymer during surface modification.

[0059] In some embodiments of this application, the conversion particles 1313, color-developing particles 1312, and black particles 1311 are all spherical structures. The spherical conversion particles 1313, color-developing particles 1312, and black particles 1311 are all dispersed in a dispersion liquid. Under the action of the electric field force of the driving electric field, the spherical color-developing particles 1312 and black particles 1311 move toward different substrates respectively.

[0060] In one example, the color-developing particles 1312 are negatively charged, the black particles 1311 are positively charged, and the conversion particles 1313 are uncharged. The first electrode 111 is connected to the positive electrode, and the second electrode 121 is connected to the negative electrode. Due to the principle of like charges repelling and unlike charges attracting, the color-developing particles 1312 move towards the first substrate 110, the black particles 1311 move towards the second substrate 120, and the conversion particles 1313, being uncharged, are repelled by the first electrode 111 and the second electrode 121 and remain in the middle position of the electronic ink unit 131, that is, the conversion particles 1313 are located between the black particles 1311 and the color-developing particles 1312. When light enters the electronic ink unit 131 from the first substrate 110 side, it is filtered into monochromatic light and ultraviolet light by the color-developing particles 1312. The ultraviolet light is converted into visible light after contacting the conversion particles 1313. The conversion particles 1313 reflect the monochromatic light and the converted visible light back into the color-developing particles 1312. After dyeing, the light is emitted from the first substrate 110 side. The increased number of emitted light rays improves the brightness of the display panel, ensuring display brightness in dark environments and enhancing the user experience of the electrophoretic display panel 100 in dark conditions. Furthermore, because the conversion particles 1313 reduce the amount of ultraviolet light entering the electrophoretic display panel 100, it avoids aging and overheating problems caused by long-term ultraviolet absorption by the internal components of the electrophoretic display panel 100, effectively extending the lifespan of the internal components.

[0061] In another example, the color-developing particles 1312 are negatively charged, the black particles 1311 are positively charged, and the conversion particles 1313 are uncharged. The first electrode 111 is connected to the negative electrode, and the second electrode 121 is connected to the positive electrode. Due to the principle of like charges repelling and unlike charges attracting, the color-developing particles 1312 move towards the second substrate 120, the black particles 1311 move towards the first substrate 110, and the conversion particles 1313, being uncharged, are repelled by the first electrode 111 and the second electrode 121 and remain in the middle position of the electronic ink unit 131, i.e., the conversion particles 1313 are located between the black particles 1311 and the color-developing particles 1312. When light enters the electronic ink unit 131 from the first substrate 110 side, it is absorbed by the black particles 1311, and the electrophoretic display panel 100 appears black.

[0062] It is worth mentioning that the sum of the diameters of the same layer of conversion particles 1313 is equal to the width of the electronic ink unit 131, ensuring that ultraviolet light transmitted through the color-developing particles 1312 is completely converted into visible light and reflected back into the color-developing particles 1312. Furthermore, the fact that the sum of the diameters of the same layer of conversion particles 1313 is equal to the width of the electronic ink unit 131 also better prevents ultraviolet light from entering the electrophoretic display panel 100.

[0063] Furthermore, the ratio of conversion particles 1313, color-developing particles 1312, and black particles 1311 can be 1:1:1 or 2:1:1.

[0064] It is understandable that the number of conversion particles 1313 is greater than the number of color particles 1312 and black particles 1311, which can ensure that most of the ultraviolet light can be converted into visible light by the conversion particles 1313, effectively increasing the amount of light emitted from the first substrate 110 side, and also preventing ultraviolet light from entering the electrophoretic display panel 100, effectively solving the aging and heat generation problems and extending the service life.

[0065] In some embodiments of this application, the electronic ink layer 130 includes at least one of red electronic ink units, green electronic ink units, and blue electronic ink units. That is, the electronic ink layer 130 may consist entirely of red electronic ink units, green electronic ink units, or blue electronic ink units; the electronic ink layer 130 may also consist of red and green electronic ink units, red and blue electronic ink units, or green and blue electronic ink units; or the electronic ink layer 130 may consist of red, green, and blue electronic ink units.

[0066] It is understandable that the electronic ink layer 130 may also include electronic ink units 131 of other colors, such as white, yellow, etc.

[0067] Furthermore, the color-developing particles 1312 corresponding to the red electronic ink unit are red, the color-developing particles 1312 corresponding to the green electronic ink unit are green, and the color-developing particles 1312 corresponding to the blue electronic ink unit are blue. All three electronic ink units—red, green, and blue—include conversion particles 1313, which can convert ultraviolet light transmitted through the color-developing particles 1312 into visible light, thereby enhancing the brightness of the electrophoretic display panel 100.

[0068] In some embodiments of this application, the first electrode 111 is a light-transmitting electrode to avoid the first electrode 111 blocking light and to ensure that light can pass through the first electrode 111 and enter the electronic ink unit 131.

[0069] Example 2

[0070] The difference between Embodiment 2 and Embodiment 1 of this application is that, see [link to Embodiment 1]. Figures 5 to 7 As shown, both the color-developing particle 1312 and the conversion particle 1313 have a hemispherical structure and are integrally formed. That is, the color-developing particle 1312 and the conversion particle 1313 are made into a spherical particle, with one half of the spherical particle being the color-developing particle 1312 and the other half being the conversion particle 1313.

[0071] In some embodiments of this application, the conversion particles 1313 are uncharged, the color-developing particles 1312 are negatively charged, and the black particles 1311 are positively charged. In display mode, under the action of the electric field force of the driving electric field, the color-developing particles 1312 drive the conversion particles 1313 to move towards the side closer to the first substrate 110. The color-developing particles 1312 are located on the side of the conversion particles 1313 that are closer to the first substrate 110, so that after the light passes through the color-developing particles 1312, impurities can be filtered out, and the mixed light of monochromatic light and ultraviolet light is directed towards the conversion particles 1313. The conversion particles 1313 convert ultraviolet light into visible light and reflect it back to the color-developing particles 1312, thereby increasing the amount of light emitted from the first substrate 110 side and improving the display brightness of the electrophoretic display panel 100.

[0072] It is worth mentioning that the density of the conversion particles 1313 and the color-developing particles 1312 can be the same or different, as long as it can be ensured that the color-developing particles 1312 are closer to the first substrate 110 during display.

[0073] In other embodiments of this application, the conversion particles 1313 are negatively charged, the color-developing particles 1312 are negatively charged, and the charge of the conversion particles 1313 is less than the charge of the color-developing particles 1312. The black particles 1311 are positively charged. In display mode, under the action of the electric field force of the driving electric field, the color-developing particles 1312 and the conversion particles 1313 move towards the side closer to the first substrate 110. Since the charge of the conversion particles 1313 is less than the charge of the color-developing particles 1312, the color-developing particles 1312 are located on the side of the conversion particles 1313 that is closer to the first substrate 110. This allows the light to filter out impurities after passing through the color-developing particles 1312, while the mixed light of monochromatic light and ultraviolet light is directed towards the conversion particles 1313. The conversion particles 1313 convert the ultraviolet light into visible light and reflect it back to the color-developing particles 1312, thereby increasing the amount of light emitted from the first substrate 110 side and improving the display brightness of the electrophoretic display panel 100.

[0074] In some embodiments of this application, the spherical particles composed of color-developing particles 1312 and conversion particles 1313 are negatively charged as a whole, that is, the color-developing particles 1312 and conversion particles 1313 carry the same amount of charge, and the density of conversion particles 1313 is greater than the density of color-developing particles 1312, while the black particles 1311 are positively charged. When display is required, under the action of the electric field force of the driving electric field, the color-developing particles 1312 and the conversion particles 1313 move simultaneously toward the side closer to the first substrate 110. Since the density of the conversion particles 1313 is greater than that of the color-developing particles 1312, the color-developing particles 1312 are located on the side of the conversion particles 1313 that is closer to the first substrate 110. This allows the light to filter out impurities after passing through the color-developing particles 1312, while the mixed light of monochromatic light and ultraviolet light is directed toward the conversion particles 1313. The conversion particles 1313 convert the ultraviolet light into visible light and reflect it back to the color-developing particles 1312, thereby increasing the amount of light emitted from the first substrate 110 side and improving the display brightness of the electrophoretic display panel 100.

[0075] It is worth mentioning that the spherical structure composed of color-developing particles 1312 and conversion particles 1313 can be formed by spraying on the upper and lower surfaces of the polymer spheres.

[0076] Optionally, biomass aerogel (i.e., gelatin and DNA in Example 1) and a color-blocking film can be directionally sprayed onto the upper and lower surfaces of the polymer spheres (using a thin film material such as a molecular sieve with sieve-like pores so that the spheres are located within the pores of the membrane layer) to form transforming particles 1313 and chromogenic particles 1312. The biomass aerogel can be ground into nanoparticles, and the color-blocking film is an organic dye. These two materials have different cross-linking materials, and then targeted modification is performed on the different cross-linking materials. Targeted modification can give different hemispheres different amounts of charge, or the weight of the cross-linking material can be adjusted, thus achieving different densities of transforming particles 1313 and chromogenic particles 1312.

[0077] Example 3

[0078] See Figure 8 As shown, Embodiment 3 of this application provides an electrophoretic display device 10, which includes a motherboard 200 and an electrophoretic display panel 100. The first electrode 111 and the second electrode 121 are electrically connected to the motherboard 200 so that the first electrode 111 and the second electrode 121 are energized or supplied with different electrical charges to generate a driving electric field to control the movement of particles in the electronic ink unit 131.

[0079] In the description of this specification, references to terms such as "some embodiments," "exemplarily," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0080] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application. Therefore, any changes or modifications made in accordance with the claims and description of this application should fall within the scope of this patent application.

Claims

1. An electrophoretic display panel, comprising a first substrate and a second substrate oppositely arranged, a first electrode and a second electrode are respectively arranged on the first substrate and the second substrate, the first electrode and the second electrode are oppositely arranged, and a driving electric field can be formed between the first electrode and the second electrode; characterized in that, The first substrate or the second substrate is a light transmission side, and the electrophoretic display panel further comprises: an electronic ink layer arranged between the first substrate and the second substrate, the electronic ink layer comprising a plurality of electronic ink units, each of the electronic ink units comprising a shell and a dispersion liquid, black particles, color-developing particles and conversion particles wrapped in the shell, the black particles and the color-developing particles being electrically charged, and the black particles and the color-developing particles being opposite in electric charge; wherein the electrophoretic display panel comprises a display mode, in the display mode: under the action of an electric field force of the driving electric field, the color-developing particles move towards the light transmission side, the black particles move away from the light transmission side, the conversion particles are located between the color-developing particles and the black particles, the color-developing particles can filter external light to obtain monochromatic light and ultraviolet light, the conversion particles can convert the ultraviolet light into visible light, reflect the monochromatic light and the visible light back to the color-developing particles, and emit from the light transmission side.

2. The electrophoretic display panel according to claim 1, characterized in that, The conversion particles are not electrically charged; the color-developing particles, the black particles and the conversion particles in spherical structure are distributed in the dispersion liquid; under the action of the electric field force of the driving electric field, the color-developing particles and the black particles move towards different substrates respectively, and the conversion particles are located at a middle position of the electronic ink unit.

3. The electrophoretic display panel according to claim 1, characterized in that, The color-developing particles and the conversion particles in hemispherical structure are integrally formed. Under the action of the electric field force of the driving electric field, the conversion particles in hemispherical structure move along with the color-developing particles in hemispherical structure.

4. The electrophoretic display panel according to claim 3, characterized in that, The conversion particles are not electrically charged.

5. The electrophoretic display panel according to claim 3, characterized in that, The conversion particles have the same electric charge as the color-developing particles, and the conversion particles have a smaller electric charge than the color-developing particles.

6. The electrophoretic display panel of claim 3, wherein, The conversion particles have the same electric charge and electric quantity as the color-developing particles, and the conversion particles have a larger density than the color-developing particles.

7. The electrophoretic display panel according to claim 2 or 3, characterized in that, The conversion particles comprise gelatin and deoxyribonucleic acid.

8. The electrophoretic display panel of claim 1, wherein, The first substrate is the light transmission side, and the first electrode is a light transmission electrode.

9. The electrophoretic display panel of claim 1, wherein, The electronic ink layer comprises at least one of red electronic ink units, green electronic ink units and blue electronic ink units, the color-developing particles in the red electronic ink units are red particles, the color-developing particles in the green electronic ink units are green particles, and the color-developing particles in the blue electronic ink units are blue particles.

10. An electrophoretic display device, characterized by comprise: a mainboard, and the electrophoretic display panel of any one of claims 1 to 9, the first electrode and the second electrode being electrically connected with the mainboard.

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