Electrophoretic display panel and electrophoretic display device

Abstract

The invention belongs to the technical field of display, and particularly relates to an electrophoretic display panel and an electrophoretic display device.The electrophoretic display panel comprises an electronic ink layer, a first substrate and a second substrate, the first substrate and the second substrate are oppositely arranged, and the first substrate and the second substrate are provided with a first electrode and a second electrode respectively; the electronic ink layer comprises a plurality of electronic ink units, and each electronic ink unit comprises a shell, and dispersion liquid, black particles, color development particles and conversion particles which are wrapped in the shell; 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 towards the side away from the light transmitting side, the conversion particles are located between the color developing particles and the black particles, and the color developing particles can filter external light to obtain monochromatic light and ultraviolet light. The conversion particles can convert ultraviolet rays into visible light, reflect monochromatic light and the visible light back to the color development particles and emit out from the light transmitting side. According to the scheme, the display brightness can be enhanced.

Description

Technical Field

[0001] The present application belongs to the field of display technology, and specifically relates to an electrophoretic display panel and an electrophoretic display device. Background Art

[0002] With the advancement of flat display technology, more and more electronic products are equipped with display devices, especially portable electronic products such as mobile phones, e-books, digital cameras, etc. As portable electronic products are developing towards light weight, small size and thin thickness, the display devices used in portable electronic products must also have the advantages of light weight, small size and thin thickness.

[0003] In order to promote paperless advertising, electronic billboards such as electrophoretic display (EPD) or electronic paper display (EPD) can replace traditional printed billboards. Electronic billboards are not only light and thin, but can also be designed to be flexible.

[0004] Common electronic paper display technology (EPD) uses electrophoretic E-link capsule type or electrophoretic SiPix microcup type electronic ink display technology. The two structures can be composed of a number of positively charged and negatively charged colored particles suspended. Under the action of the electric field, the differently charged particles will move toward the electrodes with opposite polarities. Electronic paper display technology mainly displays by reflecting or absorbing external light, which makes the existing electronic paper display technology display low brightness in dark environments. Summary of the invention

[0005] The purpose of the present application is to provide an electrophoretic display panel and an electrophoretic display device, which can enhance display brightness.

[0006] In a first aspect, the present application provides an electrophoretic display panel, including a first substrate and a second substrate arranged opposite to each other, a first electrode and a second electrode are respectively provided on the first substrate and the second substrate, the first electrode and the second electrode are arranged opposite to each other, and a driving electric field can be formed between the first electrode and the second electrode; the first substrate or the second substrate is a light transmission side, and the electrophoretic display panel further includes:

[0007] An electronic ink layer is provided between the first substrate and the second substrate, the electronic ink layer comprises a plurality of electronic ink units, each of the electronic ink units comprises 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 are both charged, and the electrical property of the black particles is opposite to that of the color-developing particles;

[0008] Among them, 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 toward the light-transmitting side, and the black particles move away from the light-transmitting 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 rays. The conversion particles can convert the ultraviolet rays 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 an exemplary embodiment of the present application, the conversion particles are uncharged; the color-developing particles, the black particles and the conversion particles of spherical structure are distributed in the dispersion;

[0010] Under the action of the electric field force of the driving electric field, the color-developing 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 an exemplary embodiment of the present application, the hemispherical color-developing particles and the hemispherical conversion particles are integrally formed;

[0012] Under the action of the electric field force of the driving electric field, the hemispherical conversion particles move following the hemispherical color-developing particles.

[0013] In an exemplary embodiment of the present application, the conversion particles are not charged.

[0014] In an exemplary embodiment of the present application, the conversion particles have the same electrical properties as the color-developing particles, and the charge of the conversion particles is less than the charge of the color-developing particles.

[0015] In an exemplary embodiment of the present application, the conversion particles have the same electrical properties and charge as the color-developing particles, and the density of the conversion particles is greater than the density of the color-developing particles.

[0016] In an exemplary embodiment of the present application, the transforming particles include gelatin and deoxyribonucleic acid.

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

[0018] In an exemplary embodiment of the present application, the electronic ink layer includes at least one of a red electronic ink unit, a green electronic ink unit and a blue electronic ink unit, 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 the present application provides an electrophoretic display device, comprising:

[0020] motherboard, and

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

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

[0023] The electrophoretic display panel of the present application solution includes a first substrate, a second substrate and an electronic ink layer sandwiched therebetween. The first substrate and the second substrate are respectively provided with a first electrode and a second electrode. A driving electric field can be formed between the first electrode and the second electrode. The first substrate or the second substrate is a light transmission side, that is, external light can be injected into the electronic ink layer through the first substrate or the second substrate. The electronic ink layer includes a plurality of electronic ink units, each of which includes a shell and a dispersion liquid, black particles, color particles and conversion particles wrapped therein. Both the black particles and the color particles are charged, and the electrical properties of the black particles are opposite to those of the color 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 particles move toward the light transmission side, and the black particles move away from the light transmission side. The conversion particles are located between the color particles and the black particles. The color particles can filter the external light to obtain monochromatic light and ultraviolet rays. The conversion particles can convert ultraviolet rays into visible light, reflect the monochromatic light and visible light back to the color particles, and emit them from the light transmission side. Compared with the prior art solution that only monochromatic light is emitted from the substrate side, the present application solution increases the visible light emitted from the substrate side, increases the amount of light emitted from the substrate side, and thus can increase the display brightness of the electrophoretic display panel, so as to increase the display brightness of the electrophoretic display panel in a dark environment, and thus increase the brightness of the electrophoretic display device. In addition, the stronger the ultraviolet light, the more visible light is converted by the conversion particles, the more light is emitted from the light transmission side, and the more obvious the brightness enhancement effect of the electrophoretic display panel is. In addition, by using conversion particles to convert ultraviolet light into visible light, it is also possible to reduce the long-term exposure of ultraviolet light to the internal equipment of the electrophoretic display panel, avoid the problems of aging and heating of the internal equipment of the electrophoretic display panel due to long-term absorption of ultraviolet light, and effectively extend the service life of the internal equipment of the electrophoretic display panel.

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

[0025] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

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

[0028] Figure 2 A schematic diagram of the structure of the electronic ink unit provided in the first or third embodiment of the present application is shown.

[0029] Figure 3 A schematic structural diagram of the electrophoretic display panel provided in the first or third embodiment of the present application in a black state is shown.

[0030] Figure 4 A schematic diagram of the structure of the electrophoretic display panel provided in the first or third embodiment of the present application in the display mode is shown.

[0031] Figure 5 A schematic diagram of the structure of the electronic ink unit provided in the second or third embodiment of the present application is shown.

[0032] Figure 6 A schematic structural diagram of the electrophoretic display panel provided in the second or third embodiment of the present application in a black state is shown.

[0033] Figure 7 A schematic diagram of the structure of the electrophoretic display panel provided in the second or third embodiment of the present application in the display mode is shown.

[0034] Figure 8 A schematic structural diagram of the connection between the main board provided in the third embodiment and the first electrode and the second electrode is shown.

[0035] Description of reference numerals:

[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 particles; 1313. Conversion particles; 200. Main board. DETAILED DESCRIPTION

[0037] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concept of the example 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 understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0039] In this application, unless otherwise clearly specified and limited, the terms "assembly", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0041] Embodiment 1

[0042] See also Figure 1 As shown, the first embodiment of the present application provides an electrophoretic display panel 100 , which includes a first substrate 110 and a second substrate 120 that are oppositely arranged and an electronic ink layer 130 located between the first substrate 110 and the second substrate 120 .

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

[0044] In some embodiments of the present 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; or it can be a block electrode, that is, the first electrode layer can include a plurality of first electrode blocks, and adjacent first electrode blocks are provided at intervals.

[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; or it can be a block electrode, that is, the second electrode layer can include a plurality of second electrode blocks, and adjacent second electrode blocks are provided at intervals.

[0046] It can be understood 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 be injected into or emitted from the first substrate 110 or the second substrate 120 to realize display or shut-off of the electrophoretic display panel 100 in turn, that is, the first substrate 110 or the second substrate 120 side is the light transmission side.

[0048] In some embodiments of the present application, the first substrate 110 is a light transmission 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 out.

[0049] In some embodiments of the present application, see Figure 1 and Figure 2 As shown, the electronic ink layer 130 includes a plurality of electronic ink units 131, and each electronic ink unit 131 is arranged at intervals or close to each other. Each electronic ink unit 131 includes a shell 1310 and a dispersion liquid, black particles 1311, color particles 1312, and conversion particles 1313 wrapped in the shell 1310. The black particles 1311 and the color particles 1312 are both charged, and the charge of the black particles 1311 is opposite to that of the color 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, the black particles 1311 move toward the first substrate 110 side, and the 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 present a black state. In the display mode, under the action of the electric field force of the driving electric field, the color particles 1312 move toward the light incident side, the black particles 1311 move toward the side away from the light incident side, and the conversion particles 1313 are located between the color particles 1312 and the black particles 1311.

[0051] It should be noted that the color particles 1312 can filter external light into ultraviolet light and monochromatic light, and the color of the monochromatic light is the same as the color of the color particles 1312, so that it can pass through the side of the color particles 1312. The mixed light of ultraviolet light and monochromatic light is emitted to the conversion particles 1313, and the conversion particles 1313 can convert ultraviolet light into visible light and can reflect the monochromatic light and visible light. In other words, when the external light passes through the color particles 1312 on the side close to the first substrate 110, the external light is filtered into a mixed light of monochromatic light and ultraviolet light. After the monochromatic light and ultraviolet light are emitted into the conversion particles 1313, the ultraviolet light is converted into visible light and reflected back to the color particles 1312 together with the monochromatic light. After the visible light passes through the color particles 1312, it shows the same color as the display particles. Together with the original monochromatic light, the amount of light emitted from the side of the first substrate 110 is increased, thereby improving the display brightness of the electrophoretic display panel 100 and improving the viewing brightness in a dark environment.

[0052] In addition, by using the conversion particles 1313 to convert ultraviolet rays into visible light, long-term ultraviolet rays irradiating the internal devices of the electrophoretic display panel 100 can be reduced, thereby avoiding aging and heating of the internal devices of the electrophoretic display panel 100 due to long-term absorption of ultraviolet rays, and effectively extending the service life.

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

[0054] In some embodiments of the present application, the electronic ink unit 131 includes a light conversion layer, and the light conversion layer includes a plurality of conversion particles 1313. The conversion particles 1313 are light conversion silica gel balls, and the conversion particles 1313 include polymers and biomass aerogel balls prepared from gelatin (GE) and deoxyribonucleic acid (DNA), and the polymers are coated or modified by the biomass aerogel balls.

[0055] It is worth mentioning that modification and coating can be carried out by physical or chemical methods. Physical methods include grinding and spraying. Chemical methods include coagulation, emulsion polymerization or dispersion polymerization, among which 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 may be charged or uncharged, as long as they can satisfy the requirement that when the color particles 1312 are close to the first substrate 110 , the conversion particles 1313 are located between the color particles 1312 and the black particles 1311 .

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

[0058] In addition, the conversion particles 1313 can be charged by coating or modifying the biomass aerogel balls with polymers, and the charge can be applied to the outside of the polymer during surface modification.

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

[0060] In an example, the color particles 1312 are negatively charged as a whole, the black particles 1311 are positively charged as a whole, 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. Under the principle of like charges repel and opposite charges attract, the color particles 1312 move toward the first substrate 110, and the black particles 1311 move toward the second substrate 120. Since the conversion particles 1313 are uncharged, they are repelled by the first electrode 111 and the second electrode 121 and are maintained 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 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 coloring 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 to the coloring particles 1312, and emit from the first substrate 110 side after dyeing. The amount of light emitted increases, which improves the brightness of the display panel, ensures the display brightness in a dark environment, and improves the user experience of the electrophoretic display panel 100 in a dark state. In addition, since the conversion particles 1313 reduce the amount of ultraviolet light entering the electrophoretic display panel 100, the aging and heating problems caused by the long-term absorption of ultraviolet light by the internal devices of the electrophoretic display panel 100 can be avoided, and the service life of the internal devices of the electrophoretic display panel 100 can be effectively extended.

[0061] In another example, the color particles 1312 are negatively charged as a whole, the black particles 1311 are positively charged as a whole, 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 opposite charges attracting, the color particles 1312 move toward the second substrate 120, and the black particles 1311 move toward the first substrate 110. Since the conversion particles 1313 are uncharged, they are repelled by the first electrode 111 and the second electrode 121 and are maintained 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 particles 1312. When light enters the electronic ink unit 131 from the side of the first substrate 110, 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 conversion particles 1313 in the same layer is equal to the width of the electronic ink unit 131, so as to ensure that the ultraviolet rays passing through the color particles 1312 can be completely converted into visible light and reflected back into the color particles 1312. In addition, the sum of the diameters of the conversion particles 1313 in the same layer is equal to the width of the electronic ink unit 131, which can better prevent ultraviolet rays from entering the electrophoretic display panel 100.

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

[0064] It can be understood that the number of conversion particles 1313 is greater than the number of color-developing particles 1312 and black particles 1311, which can ensure that most of the ultraviolet rays 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 preventing ultraviolet rays from entering the electrophoretic display panel 100, effectively solving aging and heat problems and extending the service life.

[0065] In some embodiments of the present application, the electronic ink layer 130 includes at least one of a red electronic ink unit, a green electronic ink unit, and a blue electronic ink unit. That is, the electronic ink layer 130 may be all red electronic ink units, green electronic ink units, or blue electronic ink units; the electronic ink layer 130 may also be red electronic ink units and green electronic ink units, red electronic ink units and blue electronic ink units, or green electronic ink units or blue electronic ink units; the electronic ink layer 130 may also be red electronic ink units, green electronic ink units, 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] In addition, the color particles 1312 corresponding to the red electronic ink unit are red, the color particles 1312 corresponding to the green electronic ink unit are green, and the color particles 1312 corresponding to the blue electronic ink unit are blue. The red electronic ink unit, the green electronic ink unit, and the blue electronic ink unit all include conversion particles 1313, which can convert ultraviolet rays passing through the color particles 1312 into visible light, thereby enhancing the brightness of the electrophoretic display panel 100.

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

[0069] Embodiment 2

[0070] The difference between the second embodiment of the present application and the first embodiment is that, see Figures 5 to 7 As shown, the color particles 1312 and the conversion particles 1313 are both hemispherical structures, and the color particles 1312 and the conversion particles 1313 are integrally formed. That is, the color particles 1312 and the conversion particles 1313 are made into a spherical particle, half of which is the color particle 1312 and the other half is the conversion particle 1313.

[0071] In some embodiments of the present application, the conversion particles 1313 are uncharged, the color particles 1312 are negatively charged, and the black particles 1311 are positively charged. In the display mode, under the electric field force of the driving electric field, the color particles 1312 drive the conversion particles 1313 to move toward the side close to the first substrate 110 at the same time. The color particles 1312 are located on the side of the conversion particles 1313 closer to the first substrate 110, so that after the light passes through the color particles 1312, the miscellaneous colors can be filtered out, and the mixed light of the monochromatic light and the ultraviolet light is emitted to the conversion particles 1313. The conversion particles 1313 convert the ultraviolet light into visible light and reflect it back to the color 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 may be the same or different, as long as it can ensure that the color-developing particles 1312 are closer to the first substrate 110 during display.

[0073] In some other embodiments of the present application, the conversion particles 1313 are negatively charged, the color particles 1312 are negatively charged, and the charge of the conversion particles 1313 is less than the charge of the color particles 1312, and the black particles 1311 are positively charged. In the display mode, under the action of the electric field force of the driving electric field, the color particles 1312 and the conversion particles 1313 move toward the side close to the first substrate 110 at the same time, and because the charge of the conversion particles 1313 is less than the charge of the color particles 1312, the color particles 1312 are located on the side of the conversion particles 1313 closer to the first substrate 110, so that after the light passes through the color particles 1312, the mixed colors can be filtered out, and the mixed light of the monochromatic light and the ultraviolet light is emitted to the conversion particles 1313, and the conversion particles 1313 convert the ultraviolet light into visible light and reflect it back to the color particles 1312, thereby increasing the emission amount of light on the side of the first substrate 110 and improving the display brightness of the electrophoretic display panel 100.

[0074] In some other embodiments of the present application, the spherical particles formed by the color-developing particles 1312 and the conversion particles 1313 are negatively charged as a whole, that is, the color-developing particles 1312 and the conversion particles 1313 carry the same charge, and the density of the conversion particles 1313 is greater than the density of the color-developing particles 1312, and 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 close to the first substrate 110. Since the density of the conversion particles 1313 is greater than the density 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, so that after the light passes through the color-developing particles 1312, the impurities can be filtered out, and the mixed light of monochromatic light and ultraviolet light is directed to 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 the color-developing particles 1312 and the conversion particles 1313 can be formed by spraying on the upper and lower surfaces of the polymer sphere.

[0076] Optionally, the upper and lower surfaces of the polymer spheres (thin film materials such as molecular sieves with sieve-like holes can be used to make the spheres located in the holes of the film layer) are sprayed with biomass aerogel (i.e., gelatin and DNA in Example 1) materials and color blocking films to form conversion particles 1313 and color-developing particles 1312. Biomass aerogel can be ground into nanoparticles, and the color blocking film is an organic dye material. These two materials have different cross-linking materials, and then directional modification is performed for different cross-linking materials. Directional modification can make different hemispheres carry different amounts of electrical properties, or the weight of the cross-linking material can be adjusted, so that the density of the conversion particles 1313 and the color-developing particles 1312 can be different.

[0077] Embodiment 3

[0078] See also Figure 8 As shown, embodiment three of the present application provides an electrophoretic display device 10, which includes a main board 200 and an electrophoretic display panel 100, and a first electrode 111 and a second electrode 121 are electrically connected to the main board 200, so that the first electrode 111 and the second electrode 121 are energized or have different electrical properties 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, the description with reference to the terms "some embodiments", "exemplarily", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0080] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application. Therefore, any changes or modifications made in accordance with the claims and description of the present application should fall within the scope of the patent of this application.

Claims

1. An electrophoretic display panel, comprising a first substrate and a second substrate arranged opposite to each other, wherein a first electrode and a second electrode are respectively provided on the first substrate and the second substrate, the first electrode and the second electrode are arranged opposite to each other, 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 includes: An electronic ink layer is provided between the first substrate and the second substrate, the electronic ink layer comprises a plurality of electronic ink units, each of the electronic ink units comprises 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 are both charged, and the electrical property of the black particles is opposite to that of the color-developing particles; Among them, 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 toward the light-transmitting side, and the black particles move away from the light-transmitting 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 rays. The conversion particles can convert the ultraviolet rays 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.

2. The electrophoretic display panel according to claim 1, characterized in that: The conversion particles are uncharged; the color-developing particles, the black particles and the conversion particles in a spherical structure are distributed in the dispersion; Under the action of the electric field force of the driving electric field, the color-developing particles and the black particles move toward different substrates respectively, and the conversion particles are located in the middle of the electronic ink unit.

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

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

5. The electrophoretic display panel according to claim 3, characterized in that: The conversion particles have the same electrical properties as the color-developing particles, and the charge of the conversion particles is less than the charge of the color-developing particles.

6. The electrophoretic display panel according to claim 5, characterized in that: The conversion particles have the same electrical properties and charge as the color-developing particles, and the density of the conversion particles is greater than the density of the color-developing particles.

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

8. The electrophoretic display panel according to claim 1, characterized in that: The first substrate is the light transmission side, and the first electrode is a light-transmitting electrode.

9. The electrophoretic display panel according to claim 1, characterized in that: The electronic ink layer includes at least one of a red electronic ink unit, a green electronic ink unit and a blue electronic ink unit, 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.

10. An electrophoretic display device, characterized in that: include: motherboard, and In the electrophoretic display panel according to any one of claims 1 to 9, the first electrode and the second electrode are electrically connected to the main board.

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