Display panel, method of manufacturing display panel, and display device

Abstract

The application discloses a display panel, a method for manufacturing the display panel and a display device. The display panel comprises a first substrate and a second substrate arranged oppositely, the first substrate is provided with a first electrode layer on one side, and the second substrate is provided with a second electrode layer on one side. The display panel further comprises a plurality of electronic ink units, the electronic ink units are located between the first substrate and the second substrate, and each electronic ink unit is provided with a dispersion liquid and a plurality of particles. The particles have electric charges, and the color of the particles is white. The dispersion liquid comprises a first dispersion liquid and a second dispersion liquid, the first dispersion liquid and the second dispersion liquid are mutually insoluble, the first dispersion liquid is transparent, the first dispersion liquid is close to a light-emitting side of the display panel, and the second dispersion liquid contains light-absorbing materials. Thus, when the display is in a bright state, the white particles move to the light-emitting side of the display panel, the white particles are interposed with the transparent first dispersion liquid, the bright-state reflectivity is improved, the contrast is improved, and the display effect is improved.

Description

Technical Field

[0001] This invention belongs to the field of display technology, specifically relating to display panels, methods for manufacturing display panels, and display devices. Background Technology

[0002] Reflective display devices are devices that use natural light for display. They can display clearly in both strong and weak light conditions, as well as using ambient light. They have the advantages of low driving voltage, energy saving, and minimal eye damage.

[0003] Electrophoretic display is a reflective display technology based on the principle of electrophoresis. This technology utilizes the electrophoretic properties of pigment particles, placing color particles with different charges or electrical charges within an electrophoretic display chamber (microcup or microcapsule). An electric field is applied, causing the pigment particles to move along the direction of the electric field (positively charged particles) or against the direction of the electric field (negatively charged particles), accumulating on the display unit corresponding to the electric field, thus displaying pixels in the information image. However, existing display panels have relatively poor display quality.

[0004] Therefore, it is necessary to improve the display panel. Summary of the Invention

[0005] This invention is based on the inventor's discovery and understanding of the following facts and problems.

[0006] Electrophoretic displays are categorized into single-particle displays and multi-particle displays based on the type of particles. In multi-particle displays, a reference... Figure 1 The microcapsules contain black and white microparticles. The black microparticles are negatively charged, and the white microparticles are positively charged, maintaining an overall electrical equilibrium. When a positive charge is applied to the backplate, the black microparticles move towards the backplate electrode, while the white microparticles are distributed above the microcapsules. Ambient light incident from above is reflected at the white microparticles, resulting in a bright display. When a negative charge is applied to the backplate, the white microparticles move towards the backplate electrode, while the black microparticles are distributed above the microcapsules. Ambient light incident from above is absorbed at the black microparticles, resulting in a dark display. Multi-particle displays require the inclusion of two types of particles with opposite charges within the microcapsules, making the process complex.

[0007] In single-particle displays, microcapsules contain particles with an electrical charge (positive or negative). The microcapsules also contain an insulating electrophoretic solution containing dissolved dye. Under an applied electric field, the charged particles migrate electrophoretically in the solution, thus displaying images and text. When the external electric field changes, the particles within the chamber also move accordingly, displaying different images and text. Specifically, the particles in the microcapsules can be white, and the electrophoretic solution can be black. When displaying a dark state, refer to... Figure 2, the white particles move downward, at this time, the color of the electrophoretic fluid is displayed, which is black. When the bright state is displayed, the reference Figure 3 , the white particles move upward to the surface of the substrate, but the white particles cannot completely expel the black electrophoretic fluid, and thus the white particles are mixed with the black electrophoretic fluid, the bright state has low brightness and poor display effect.

[0008] To improve the above technical problems, the present application provides a display panel, which comprises a first substrate and a second substrate arranged oppositely, the first substrate is provided with a first electrode layer on a side close to the second substrate, and the second substrate is provided with a second electrode layer on a side close to the first substrate; the display panel further comprises a plurality of electronic ink units, the electronic ink units are located between the first substrate and the second substrate, and each of the electronic ink units is provided with a dispersion liquid and a plurality of particles; the particles have electric charges, and the color of the particles is white; the dispersion liquid comprises a first dispersion liquid and a second dispersion liquid, the first dispersion liquid and the second dispersion liquid are immiscible with each other, the first dispersion liquid is transparent, the first dispersion liquid is close to a light exit side of the display panel, and the second dispersion liquid contains light-absorbing material. Thus, when the bright state is displayed, the white particles move and gather to the substrate close to the light exit side of the display panel, and the white particles are mixed with the transparent first dispersion liquid, the design of the present application improves the reflectivity of the bright state, thereby improving the contrast and the display effect.

[0009] According to the embodiment of the present application, the display panel further comprises a barrier structure between adjacent electronic ink units. Thus, the closed cavities formed by the first electrode layer, the second electrode layer and the barrier structure constitute the electronic ink units, and the dispersion liquid and the plurality of particles are distributed in the closed cavities. Compared with the microcapsules, the shape of the electronic ink units of the present application has better display effect.

[0010] According to the embodiment of the present application, the first electrode layer is a surface electrode; the second electrode layer comprises a plurality of sub-electrodes arranged at intervals, and the orthographic projection of the sub-electrodes on the second substrate does not overlap with the orthographic projection of the barrier structure on the second substrate. Thus, different electronic ink units can be controlled individually, and different voltages can be applied to the electronic ink units located at different positions as needed, thereby controlling the display effect.

[0011] According to the embodiment of the present application, the display panel further comprises a driving circuit layer between the second electrode layer and the second substrate; the driving circuit layer is provided with a plurality of sub-driving circuits, and the number of the sub-driving circuits is the same as the number of the sub-electrodes. Thus, the size of the voltage and the direction of the electric field applied to the electronic ink unit located directly above the sub-driving circuit can be controlled by the sub-driving circuit, thereby controlling the display effect.

[0012] According to an embodiment of the present application, the display panel further comprises a first insulating layer and a second insulating layer, the first insulating layer is located on the side of the first electrode layer away from the first substrate, and the second insulating layer is located on the side of the second electrode layer away from the second substrate; the second insulating layer covers the projection of the barrier structure on the second substrate. Thus, the first insulating layer and the second insulating layer can keep the size of the charge carried by the particles unchanged, thereby prolonging the service life of the display panel.

[0013] According to an embodiment of the present application, the first dispersion liquid and the second dispersion liquid are independently selected from a hydrophilic solvent or a lipophilic solvent; thus, the first dispersion liquid and the second dispersion liquid are not miscible with each other and can be layered.

[0014] The lipophilic solvent comprises at least one of an alkane compound, an aromatic hydrocarbon compound, a halogenated hydrocarbon compound, and a cycloalkane compound; and the hydrophilic solvent comprises water.

[0015] According to an embodiment of the present application, the light-absorbing material comprises at least one of a black dye, a black hollow carbon sphere, and a carbon nanotube; the color of the barrier structure is black; thus, when displaying a dark state, the external light entering the electronic ink unit can be absorbed by the light-absorbing material in the second dispersion liquid and the black barrier structure of the sidewall, and the dark state can have a better display effect.

[0016] The material forming the particles comprises titanium dioxide; thus, the particles can be white.

[0017] According to an embodiment of the present application, the display panel satisfies at least one of the following conditions: the thickness of the first electrode layer is 0.1-1.0 μm; the thickness of the first insulating layer is 0.1-1.0 μm; the thickness of the second electrode layer is 0.1-1.0 μm; the height of the barrier structure is 5-50 μm; and the thickness of the second insulating layer is 0.1-1.0 μm. The material forming the first substrate and the material forming the second substrate comprise glass; the material forming the first electrode layer and the material forming the second electrode layer comprise ITO; and the material forming the first insulating layer and the material forming the second insulating layer comprise SiO. Thus, the display panel can have a better display effect.

[0018] This invention also provides a method for manufacturing a display panel, the method comprising: providing a first substrate and a second substrate; forming a first electrode layer on one side of the first substrate; forming a second electrode layer on one side of the second substrate; assembling the first substrate and the second substrate, injecting a dispersion liquid and a plurality of particles between the first substrate and the second substrate to form electronic ink units; wherein the first electrode layer is located on the side of the first substrate closer to the second substrate, and the second electrode layer is located on the side of the second substrate closer to the first substrate; the display panel includes a plurality of electronic ink units, the particles are charged, and the particles are white; the dispersion liquid includes a first dispersion liquid and a second dispersion liquid, the first dispersion liquid and the second dispersion liquid being immiscible; the first dispersion liquid is transparent and located near the light-emitting side of the display panel; the second dispersion liquid contains a light-absorbing material. Thus, when the manufactured display panel displays a bright state, the white particles move and aggregate towards the light-emitting side of the display panel, with the transparent first dispersion liquid interspersed among the white particles. This design of the present invention can improve the reflectivity in a bright state, thereby improving contrast and display effect.

[0019] The present invention also provides a display device comprising the display panel described above. Thus, the display device possesses all the features and advantages of the display panel described above, which will not be repeated here. In general, the display device can improve luminous reflectivity, thereby improving contrast and display effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram illustrating the principle of multi-particle display in existing electrophoretic display panels;

[0021] Figure 2 This is a schematic diagram illustrating the principle of displaying the dark state in an existing electrophoretic display panel using a single-particle display method.

[0022] Figure 3 This is a schematic diagram illustrating the principle of displaying a bright state in an existing electrophoretic display panel using a single-particle display method.

[0023] Figure 4 This is a schematic diagram of the structure of the display panel in one embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the display panel structure in another embodiment of the present invention;

[0025] Figure 6 This is a top view of the retaining wall structure in one embodiment of the present invention;

[0026] Figure 7 for Figure 5A schematic diagram showing the principle of the display panel in a bright state;

[0027] Figure 8 For Figure 5 A schematic diagram showing the principle of the display panel in a dark state;

[0028] Figure 5 A flow chart of the method for manufacturing the display panel in an embodiment of the present application;

[0029] Figure 9 A schematic diagram showing the structure of the first substrate with the first electrode layer and the first insulating layer formed on the surface of the first substrate in an embodiment of the present application;

[0030] Figure 10 A schematic diagram showing the structure of the second substrate with the driving circuit layer and the second electrode layer formed on the surface of the second substrate in an embodiment of the present application;

[0031] Figure 11 A schematic diagram showing the structure of the second substrate with the barrier structure formed on the surface of the second substrate in an embodiment of the present application;

[0032] Figure 12 A schematic diagram showing the structure of the second substrate with the second insulating layer formed on the surface of the second electrode layer and the barrier structure in an embodiment of the present application.

[0033] Explanation of reference numerals

[0034] 1000 - display panel, 100 - first substrate, 200 - second substrate, 300 - first electrode layer, 400 - second electrode layer, 410 - sub-electrode, 500 - electronic ink unit, 510 - dispersion liquid, 520 - particle, 511 - first dispersion liquid, 512 - second dispersion liquid, 600 - barrier structure, 700 - driving circuit layer, 800 - first insulating layer, 900 - second insulating layer. DETAILED DESCRIPTION

[0035] Embodiments of the present application are described in detail below. The embodiments described below are exemplary only, and are not intended to be limiting of the present application. Unless otherwise indicated, technical or scientific terms used in the embodiments have the same meaning as commonly understood by one of ordinary skill in the art to which the present application pertains. Unless otherwise indicated, all technical and scientific words, terms, phrases, and / or symbols used herein have the same meanings as commonly understood by one of ordinary skill in the art to which this application pertains when read in light of the teachings and disclosures embodied herein.

[0036] The existing display panel in a bright state, referring to Figure 13 , white particles move up to the surface of the substrate, and it is impossible for the white particles to completely expel the black electrophoretic liquid, thereby causing the white particles to be mixed with the black electrophoretic liquid, and the bright state has a low brightness and a poor display effect.

[0037] To improve the above technical problems, the present application provides a display panel, referring to Figure 3 The display panel 1000 includes a first substrate 100 and a second substrate 200 arranged oppositely, the first substrate 100 is provided with a first electrode layer 300 on the side close to the second substrate 200, and the second substrate 200 is provided with a second electrode layer 400 on the side close to the first substrate 100; the display panel 1000 further includes a plurality of electronic ink units 500, the electronic ink units 500 are located between the first substrate 100 and the second substrate 200, and each of the electronic ink units 500 is provided with a dispersion liquid 510 and a plurality of particles 520; the particles 520 have electric charges, and the color of the particles 520 is white; the dispersion liquid 510 includes a first dispersion liquid 511 and a second dispersion liquid 512, the first dispersion liquid 511 and the second dispersion liquid 512 are immiscible with each other, the first dispersion liquid 511 is transparent, the first dispersion liquid 511 is close to the light exit side of the display panel 1000, and the second dispersion liquid 512 contains light-absorbing materials. Thus, under the action of an electric field, the white particles 520 can reciprocate between the first substrate 100 and the second substrate 200. The first dispersion liquid 511 and the second dispersion liquid 512 of the present application are immiscible with each other, the first dispersion liquid 511 and the second dispersion liquid 512 are layered, and the interface of the layering is j (referring to Figure 4 When the display is in a bright state, the white particles 520 move to the surface close to the light exit side of the display panel 1000, and the white particles 520 are interposed with the transparent first dispersion liquid 511. Compared with the existing single-particle display, the design of the present application improves the bright-state reflectivity and the contrast ratio of the display panel, thereby improving the display effect.

[0038] The present application does not limit the shape of the electronic ink unit 500, which can be a microcapsule (as shown in Figure 4 ), or other shapes (as shown in Figure 4 ).

[0039] According to an embodiment of the present application, the display panel 1000 further includes a barrier wall structure 600, the barrier wall structure 600 is located between adjacent electronic ink units 500. Thus, the closed cavity formed by the first substrate 100, the second substrate 200, and the barrier wall structure 600 can serve as an electronic ink unit 500, the closed cavity is distributed with the dispersion liquid and the plurality of particles, and different electronic ink units 500 are not communicated with each other. Compared with the microcapsule, Figure 5 The shape of the electronic ink unit in the present application has better display effect.

[0040] Referring to Figure 5The barrier wall structure 600 is distributed along a first direction and a second direction, and the first direction and the second direction intersect. The barrier wall structure 600 defines the display panel 1000 as a non-luminous area and a plurality of luminous areas. In each luminous area, there is an electronic ink unit 500. By controlling the direction and voltage of the electric field applied to the electronic ink unit 500, the movement of the particles in the electronic ink unit 500 can be controlled, and thus the display effect of the luminous area can be controlled.

[0041] The principle of the display panel 1000 displaying a bright state and a dark state is described below.

[0042] With reference to Figure 6 By controlling the voltage and the direction of the electric field applied to the first electrode layer 300 and the second electrode layer 400, the white particles 520 can be moved upward to the top of the electronic ink unit 500, and the external light is reflected and scattered back by the white particles 520, presenting white, i.e., the bright state.

[0043] With reference to Figure 7 By controlling the voltage and the direction of the electric field applied to the first electrode layer 300 and the second electrode layer 400, the white particles 520 can enter the bottom of the electronic ink unit 500, i.e., the white particles 520 enter the second dispersion liquid 512, and the external light entering the electronic ink unit 500 is absorbed by the second dispersion liquid 512 and the barrier wall structure 600 of the sidewall, presenting black, i.e., the dark state.

[0044] According to an embodiment of the present application, with reference to Figure 8 The first electrode layer 300 is a surface electrode; the second electrode layer 400 includes a plurality of sub-electrodes 410 arranged at intervals, and the orthographic projection of the sub-electrodes 410 on the second substrate 200 does not overlap the orthographic projection of the barrier wall structure 600 on the second substrate 200. In this way, different voltages can be applied to different electronic ink units 500, and the display effect of each electronic ink unit 500 can be controlled individually; the barrier wall structure 600 can separate adjacent electronic ink units 500, avoiding the problem of color bleeding between adjacent electronic ink units 500.

[0045] According to an embodiment of the present application, with reference to Figure 5 The display panel 1000 further includes a driving circuit layer 700, and the driving circuit layer 700 is located between the second electrode layer 400 and the second substrate 200. In this way, the driving circuit layer 700 can place the electronic ink unit 500 in an electric field, and the driving circuit layer 700 can control the voltage and the direction of the electric field applied to the first electrode layer 300 and the second electrode layer 400, so that the white particles 520 in the electronic ink unit 500 move directionally and develop color.

[0046] Further, a plurality of sub-driving circuits (not shown in the figure) are arranged in the driving circuit layer 700, the number of the sub-driving circuits is the same as the number of the sub-electrodes 410, the sub-driving circuits correspond to the sub-electrodes 410 one by one, and each sub-driving circuit is connected with one sub-electrode 410. Thus, each electronic ink unit 500 can be controlled individually, so that the display panel 1000 has better display effect. Specifically, by the sub-driving circuit, the movement of the white particles 520 in the electronic ink unit 500 located above the sub-driving circuit can be controlled, and then the color, pattern or text displayed by the electronic ink unit 500 can be controlled.

[0047] In some embodiments of the present application, the sub-driving circuit is located between the sub-electrode 410 and the second substrate 200, that is, below each sub-electrode 410, and one sub-driving circuit is arranged below each sub-electrode 410. That is, the orthographic projection of the sub-driving circuit on the second substrate 200 overlaps the orthographic projection of the sub-electrode 410 on the second substrate 200.

[0048] Since the particles 520 are charged, in the use process of the display panel 1000, the particles 520 can reciprocate between the first electrode layer 300 and the second electrode layer 400 to develop color; if the charged particles 520 directly contact the first electrode layer 300 and the second electrode layer 400, the charging property of the particles 520 will be affected, the charge of the particles 520 will be reduced, and even the particles 520 will not be charged, which will cause the electronic ink unit 500 to fail and affect the normal display of the display panel 1000. To improve this technical problem, according to the present application, the first insulating layer 800 and the second insulating layer 900 are arranged in the display panel 1000. Figure 5 Specifically, the first insulating layer 800 is located on the side of the first electrode layer 300 away from the first substrate 100, and the second insulating layer 900 is located on the side of the second electrode layer 400 away from the second substrate 200; the orthographic projection of the second insulating layer 900 on the second substrate 200 covers the orthographic projection of the barrier structure 600 on the second substrate 200. Thus, in the use process of the display panel 1000, the charge carried by the particles 520 can be ensured to be stable and unchanged, and thus the service life of the display panel 1000 is prolonged.

[0049] According to the embodiments of the present application, the first dispersion liquid 511 and the second dispersion liquid 512 are independently selected from a hydrophilic solvent or an oleophilic solvent; that is, the first dispersion liquid 511 can be selected from a hydrophilic solvent, and the second dispersion liquid 512 is selected from an oleophilic solvent; or the first dispersion liquid 511 can be selected from an oleophilic solvent, and the second dispersion liquid 512 is selected from a hydrophilic solvent.

[0050] The oleophilic solvent includes at least one of an alkane compound, an aromatic hydrocarbon compound, a halogenated hydrocarbon compound, and a cycloalkane compound; further, the alkane compound includes an isomeric alkane.

[0051] The hydrophilic solvent includes water.

[0052] According to an embodiment of the present application, the light-absorbing material includes at least one of black dye, black hollow carbon sphere, and carbon nanotube; thereby, the light-absorbing material can absorb visible light.

[0053] The color of the barrier wall structure 600 is black; thereby, when displaying a dark state, the external light can be absorbed by the barrier wall structure 600 of the sidewall and the light-absorbing material in the second dispersion liquid 512 after the external light enters the electronic ink unit 500, and the display effect of the dark state is better.

[0054] For example, the material forming the barrier wall structure 600 can be black resin glue material.

[0055] The material forming the particle 520 includes titanium dioxide; thereby, the particle 520 is white.

[0056] According to an embodiment of the present application, the thickness of the first electrode layer 300 is 0.1-1.0 μm. The thickness of the second electrode layer 400 is 0.1-1.0 μm. At this time, the display panel has better display effect.

[0057] According to an embodiment of the present application, the height of the barrier wall structure 600 is 5-50 μm; the height of the barrier wall refers to the length of the barrier wall structure 600 along the direction perpendicular to the extension direction of the first substrate 100.

[0058] According to an embodiment of the present application, the thickness of the first insulating layer 800 is 0.1-1.0 μm. Thereby, the first insulating layer 800 can protect the charged particle 520, ensure the stability of the charge of the particle 520, and effectively prolong the service life of the display panel 1000. If the thickness of the first insulating layer 800 is too small, the charge of the particle 520 cannot be effectively protected. If the thickness of the first insulating layer 800 is too large, the transmittance is affected, and the display effect is deteriorated.

[0059] According to an embodiment of the present application, the thickness of the second insulating layer 900 is 0.1-1.0 μm. Thereby, the second insulating layer 900 can ensure the stability of the charge of the particle 520, and prolong the service life of the display panel 1000. If the thickness of the second insulating layer 900 is too small, the charge of the particle 520 cannot be effectively protected. If the thickness of the second insulating layer 900 is too large, the transmittance is affected, and the display effect is deteriorated.

[0060] According to an embodiment of the present application, the material forming the first substrate 100 and the material forming the second substrate 200 comprise glass; the material forming the first electrode layer 300 and the material forming the second electrode layer 400 comprise ITO; the material forming the first insulating layer 800 and the material forming the second insulating layer 900 comprise SiO. In this way, the first substrate 100, the first electrode layer 300, and the first insulating layer 800 can be ensured to be transparent, i.e., the structure close to the light-emitting side of the display panel 1000 is transparent, and the display panel 1000 can be ensured to have a better display effect.

[0061] The present application also provides a method for manufacturing a display panel, referring to Figure 5 , the method comprises:

[0062] S100, providing a first substrate and a second substrate

[0063] The material forming the first substrate and the material forming the second substrate comprise glass.

[0064] S200, forming a first electrode layer on one side of the first substrate

[0065] The first electrode layer is located on the side of the first substrate close to the second substrate, and the first substrate can support the structure of the first electrode layer and protect the structure inside the display panel. The material of the first electrode layer and the thickness of the first electrode layer have been described above and will not be repeated here.

[0066] After forming the first electrode layer, the method further comprises the step of forming a first insulating layer on the side of the first electrode layer away from the first substrate, and the resulting structure is as shown in Figure 9 .

[0067] S300, forming a second electrode layer on one side of the second substrate

[0068] The second electrode layer is located on the side of the second substrate close to the first substrate; the material of the second electrode layer and the thickness of the second electrode layer have been described above and will not be repeated here.

[0069] In some embodiments of the present application, before forming the second electrode layer, the method comprises: forming a driving circuit layer on one side of the second substrate, then forming an electrode layer on the side of the driving circuit layer away from the second substrate, then patterning the electrode layer to form the second electrode layer, and the resulting structure is as shown in Figure 10 , then forming a barrier structure on the surface of the driving circuit layer not covered by the second electrode layer, and the resulting structure is as shown in Figure 11 , then forming a second insulating layer on the side of the second electrode layer and the barrier structure away from the driving circuit layer, and the resulting structure is as shown in Figure 12 Figure 13 .

[0070] Specifically, the driving circuit layer can be manufactured using a conventional exposure and development process, and the barrier structure can be manufactured through the exposure and development process.

[0071] S400, injecting a dispersion liquid and a plurality of particles between the first substrate and the second substrate to form an electronic ink unit;

[0072] The display panel includes a plurality of electronic ink units, the particles have electric charges, and the particles are white in color; the dispersion liquid includes a first dispersion liquid and a second dispersion liquid, the first dispersion liquid and the second dispersion liquid are immiscible with each other; the first dispersion liquid is transparent, and the first dispersion liquid is close to the light exit side of the display panel; and the second dispersion liquid contains light-absorbing material.

[0073] According to an embodiment of the present application, the injection of the dispersion liquid and the plurality of particles can be inject or inkjet printing.

[0074] The injection of the dispersion liquid and the plurality of particles includes: first injecting the second dispersion liquid, and then injecting the first dispersion liquid; and the particles can be mixed into the first dispersion liquid and / or the second dispersion liquid.

[0075] For example, the second dispersion liquid mixed with the plurality of particles can be first injected, and then the first dispersion liquid is injected. Alternatively, the second dispersion liquid can be first injected, and then the first dispersion liquid mixed with the plurality of particles is injected. Alternatively, the second dispersion liquid mixed with a part of the particles can be first injected, and then the first dispersion liquid mixed with another part of the particles is injected.

[0076] Therefore, the display panel manufactured by the method can improve the bright-state reflectivity, thereby improving the contrast ratio and having a better display effect.

[0077] In some embodiments of the present application, the display panel manufactured by the method has the same structure as the display panel described above, and therefore, the method has all the features and advantages of the display panel described above, which will not be repeated here.

[0078] The present application also provides a display device including the display panel described above. Therefore, the display device has all the features and advantages of the display panel described above, which will not be repeated here. In general, the display device can improve the bright-state reflectivity, thereby improving the contrast ratio and having a better display effect.

[0079] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0080] In addition, it should be noted that in the present specification, the terms "first", "second", "third", and the like are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated.

[0081] In the description of the present application, the description with reference to the terms "one embodiment", "another embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0082] Although the embodiments of the present application have been shown and described above, it should be understood that the above-described embodiments are exemplary and cannot be understood as a limitation of the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A display panel, characterized by, The display panel comprises a first substrate and a second substrate arranged oppositely, the first substrate is provided with a first electrode layer on a side close to the second substrate, and the second substrate is provided with a second electrode layer on a side close to the first substrate; The display panel further comprises a plurality of electronic ink units, the electronic ink units are located between the first substrate and the second substrate, and each of the electronic ink units is provided with a dispersion liquid and a plurality of particles; The particles have electric charges, and the particles are white in color; the dispersion liquid comprises a first dispersion liquid and a second dispersion liquid, the first dispersion liquid and the second dispersion liquid are immiscible with each other, the first dispersion liquid is transparent, the first dispersion liquid is close to a light-emitting side of the display panel, the second dispersion liquid contains light-absorbing material, and the light-absorbing material comprises at least one of black dye, black hollow carbon sphere and carbon nanotube; The display panel displays a bright state by moving the white particles to the top of the electronic ink unit, and displays a dark state by moving the white particles into the second dispersion liquid.

2. The display panel of claim 1, wherein, The display panel further comprises a barrier structure, and the barrier structure is located between adjacent electronic ink units.

3. The display panel of claim 2, wherein, The first electrode layer is a surface electrode; The second electrode layer comprises a plurality of sub-electrodes arranged at intervals, and the orthographic projection of the sub-electrodes on the second substrate does not overlap with the orthographic projection of the barrier structure on the second substrate.

4. The display panel of claim 3, wherein, The display panel further comprises a driving circuit layer, and the driving circuit layer is located between the second electrode layer and the second substrate; The driving circuit layer is provided with a plurality of sub-driving circuits, and the number of the sub-driving circuits is the same as the number of the sub-electrodes.

5. The display panel of claim 2, wherein, The display panel further comprises a first insulating layer and a second insulating layer, the first insulating layer is located on a side of the first electrode layer away from the first substrate, and the second insulating layer is located on a side of the second electrode layer away from the second substrate; The orthographic projection of the second insulating layer on the second substrate covers the orthographic projection of the barrier structure on the second substrate.

6. The display panel of claim 1, wherein, The first dispersion liquid and the second dispersion liquid are independently selected from a hydrophilic solvent or a lipophilic solvent; The lipophilic solvent comprises at least one of alkane compound, aromatic hydrocarbon compound, halogenated hydrocarbon compound and cycloalkane compound; The hydrophilic solvent comprises water.

7. The display panel of claim 2, wherein, The color of the barrier structure is black; The material forming the particles comprises titanium dioxide.

8. The display panel of claim 5, wherein, The display panel satisfies at least one of the following conditions: The thickness of the first electrode layer is The thickness of the first insulating layer is The thickness of the second electrode layer is The height of the barrier structure is 5-50 μm; The thickness of the second insulating layer is The material forming the first substrate and the material forming the second substrate comprise glass; the material forming the first electrode layer and the material forming the second electrode layer comprise ITO; and the material forming the first insulating layer and the material forming the second insulating layer comprise SiO.

9. A method of manufacturing the display panel according to any one of claims 1 to 8, characterized by, The method comprises: providing a first substrate and a second substrate; forming a first electrode layer on a side of the first substrate; forming a second electrode layer on a side of the second substrate; Cell-assembling the first substrate and the second substrate, injecting a dispersion liquid and a plurality of particles between the first substrate and the second substrate to form an electronic ink unit; Wherein, the first electrode layer is located on the side of the first substrate close to the second substrate, and the second electrode layer is located on the side of the second substrate close to the first substrate; The display panel comprises a plurality of electronic ink units, the particles have electric charges, and the color of the particles is white; the dispersion liquid comprises a first dispersion liquid and a second dispersion liquid, the first dispersion liquid and the second dispersion liquid are mutually insoluble; The first dispersion liquid is transparent, and the first dispersion liquid is close to the light-out side of the display panel; the second dispersion liquid contains light-absorbing material.

10. A display device, characterized by comprising: The display device comprises the display panel of any one of claims 1-8.

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