CN114879425A - Display panel, method of making display panel, and display device - Google Patents

Abstract

The invention discloses a display panel, a method for manufacturing the display panel and a display device. The display panel includes a first substrate and a second substrate arranged oppositely, a first electrode layer is provided on one side of the first substrate, and one side of the second substrate is provided A second electrode layer is arranged on the side; the display panel also includes 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 Charge, the color of the particles is white; 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 display panel The light-emitting side of the second dispersion liquid contains a light-absorbing material. Therefore, when the bright state is displayed, the white particles move to the light-emitting side of the display panel, and the white particles are mixed with the transparent first dispersion liquid, which improves the reflectivity in the bright state, thereby improving the contrast ratio and improving the display effect.

Description

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

technical field

The invention belongs to the field of display technology, and in particular relates to a display panel, a method for manufacturing the display panel and a display device.

Background technique

The reflective display device is a device structure that uses natural light to display. It can be clearly displayed under strong light and weak light and also by ambient light. It has the advantages of low driving voltage, energy saving and little damage to the eyes.

Electrophoretic display is a reflective display technology based on the principle of electrophoresis. This technology utilizes the electrophoretic properties of pigment particles to place color particles with different charges or electric quantities in the electrophoretic display chamber (microcup or microcapsule) and apply an electric field. , the pigment particles move in the direction of the electric field (positively charged particles) or in the opposite direction of the electric field (negatively charged particles), and gather on the display unit corresponding to the electric field, thereby displaying the pixels in the information image. However, the display effect of the existing display panel is poor.

Therefore, it is necessary to improve the display panel.

SUMMARY OF THE INVENTION

The present invention has been made based on the inventors' findings and recognition of the following facts and problems.

Electrophoretic display can be divided into single particle display and multi-particle display according to different particle types. In the multi-particle display, referring to Figure 1, the inside of the microcapsule contains black particles and white particles, the black particles are negatively charged, and the white particles are positively charged, and the microcapsules are in an electrical equilibrium state as a whole. When the backplane is positively charged, the black particles approach the backplane electrode, the white particles are distributed above the microcapsules, and the ambient light incident from above is reflected at the white particles of the microcapsules, and the display device appears bright; when the backplane is negatively charged , the white particles approach the backplane electrode, the black particles are distributed above the microcapsules, the ambient light incident from above is absorbed at the black particles of the microcapsules, and the display device appears dark. In the multi-particle display, two kinds of particles with opposite charges need to be added into the microcapsule, and the process is complicated.

In the single-particle display, the microcapsules have a kind of particle, the particles are charged (positive or negative), and the microcapsules also have an insulating electrophoresis solution containing dyes. Under the action of an external electric field, the charged particles are in the electrophoresis solution. The corresponding electrophoretic migration occurs in the image and text. When the external electric field is converted, the particles in the chamber also move accordingly, presenting different images and texts. Specifically, the color of the particles in the microcapsules can be white, and the color of the electrophoresis solution can be black. When the dark state is displayed, referring to FIG. 2, the white particles move downward, and the color of the electrophoresis solution is displayed at this time. black. When displaying the bright state, referring to Fig. 3, the white particles move upward to the surface of the substrate, but the white particles cannot completely displace the black electrophoretic solution, thus causing the white particles to be mixed with the black electrophoretic solution. The brightness of the bright state is low, and the display less effective.

In order to improve the above technical problems, the present invention provides a display panel, the display panel includes a first substrate and a second substrate arranged oppositely, and the first substrate is provided with a first electrode on a side close to the second substrate The second substrate is provided with a second electrode layer on the side close to the first substrate; the display panel further includes a plurality of electronic ink units, and the electronic ink units are located between the first substrate and the first substrate. Between the second substrates, 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 includes a first dispersion liquid and a second Two dispersion liquids, 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 the light-emitting side of the display panel, and the first dispersion liquid is transparent. The two dispersions contain light absorbing materials. Therefore, when the bright state is displayed, the white particles move and gather on the substrate near the light-emitting side of the display panel, and the white particles are mixed with the transparent first dispersion liquid. The design of the present invention improves the reflectivity of the bright state, thereby Improve the contrast, improve the display effect.

According to an embodiment of the present invention, the display panel further includes a blocking wall structure, and the blocking wall structure is located between the adjacent electronic ink units. Thus, the closed cavity formed by the first electrode layer, the second electrode layer, and the retaining wall structure constitutes an electronic ink unit, and dispersion liquid and a plurality of particles are distributed in the closed cavity. The shape of the e-ink unit has a better display.

According to an embodiment of the present invention, the first electrode layer is a surface electrode; the second electrode layer includes a plurality of sub-electrodes arranged at intervals, and the orthographic projection of the sub-electrodes on the second substrate is the same as that of the barrier The orthographic projections of the wall structures on the second substrate do not overlap. In this way, different electronic ink units can be individually controlled, and different voltages can be applied to electronic ink units located at different positions as required, thereby controlling the display effect.

According to an embodiment of the present invention, the display panel further includes a driving circuit layer, the driving circuit layer is located between the second electrode layer and the second substrate; a plurality of sub-driving circuits are arranged in the driving circuit layer , the number of the sub-driving circuits is the same as the number of the sub-electrodes. In this way, the magnitude of the voltage and the direction of the electric field applied to the electronic ink unit directly above the sub-drive circuit can be controlled, thereby controlling the display effect thereof.

According to an embodiment of the present invention, the display panel further includes 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 first electrode layer away from the first substrate. The insulating layer is located on the 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 retaining wall structure on the second substrate projection. Therefore, through the first insulating layer and the second insulating layer, the size of the charges carried by the particles can be kept unchanged, thereby prolonging the service life of the display panel.

According to an embodiment of the present invention, the first dispersion liquid and the second dispersion liquid are independently selected from hydrophilic solvents or lipophilic solvents; thus, the first dispersion liquid and the second dispersion liquid are mutually incompatible Dissolved, can be layered.

The lipophilic solvent includes at least one of alkane compounds, aromatic hydrocarbon compounds, halogenated hydrocarbon compounds, and naphthenic hydrocarbon compounds; and the hydrophilic solvent includes water.

According to an embodiment of the present invention, the light-absorbing material includes at least one of black dye, black hollow carbon spheres, and carbon nanotubes; the color of the retaining wall structure is black, so that when the dark state is displayed, external light enters After the electronic ink unit can be absorbed by the light-absorbing material in the second dispersion liquid and the black retaining wall structure of the sidewall, it appears black, which can make the dark state have a better display effect.

The material from which the particles are formed includes titanium dioxide, whereby the particles can appear white.

所述第一绝缘层的厚度为

所述第二电极层的厚度为

所述挡墙结构的高度为5-50μm；所述第二绝缘层的厚度为

形成所述第一基板的材料和形成所述第二基板的材料包括玻璃；形成所述第一电极层的材料和形成所述第二电极层的材料包括ITO；形成所述第一绝缘层的材料和形成所述第二绝缘层的材料包括SiO。由此，可以使显示面板具有更好的显示效果。According to an embodiment of the present invention, 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 retaining wall structure is 5-50 μm; the thickness of the second insulating layer is

The material for forming the first substrate and the material for forming the second substrate include glass; the material for forming the first electrode layer and the material for forming the second electrode layer include ITO; the material for forming the first insulating layer The material and the material forming the second insulating layer include SiO. Therefore, the display panel can have a better display effect.

The present 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; and forming a first electrode layer on one side of the second substrate forming a second electrode layer; 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 includes multiple an electronic ink unit, the particles have electric charge, and the color of the particles is white; the dispersion liquid includes a first dispersion liquid and a second dispersion liquid, and the first dispersion liquid and the second dispersion liquid are mutually exclusive Compatible; the first dispersion liquid is transparent, and the first dispersion liquid is close to the light-emitting side of the display panel; the second dispersion liquid contains a light-absorbing material. Therefore, when the manufactured display panel displays the bright state, the white particles move and gather toward the light-emitting side close to the display panel, and the white particles are mixed with the transparent first dispersion liquid. The design of the present invention can improve the reflection in the bright state. rate, thereby increasing the contrast ratio and improving the display effect.

The present invention also provides a display device, which includes the aforementioned display panel. Therefore, the display device has all the features and advantages of the aforementioned display panel, which will not be repeated here. In general, the display device can improve the reflectivity in the bright state, thereby improving the contrast ratio and improving the display effect.

Description of drawings

FIG. 1 is a schematic diagram of the principle of adopting a multi-particle display method in an existing electrophoretic display panel;

FIG. 2 is a schematic diagram of the principle of displaying a dark state in an existing electrophoretic display panel when a single particle display mode is adopted;

FIG. 3 is a schematic diagram of the principle of displaying a bright state when a single particle display mode is adopted in an existing electrophoretic display panel;

FIG. 4 is a schematic structural diagram of a display panel according to an embodiment of the present invention;

5 is a schematic structural diagram of a display panel in another embodiment of the present invention;

6 is a top view of a retaining wall structure in an embodiment of the present invention;

FIG. 7 is a schematic diagram of the principle of the display panel in FIG. 5 when it is in a bright state;

FIG. 8 is a schematic diagram of the principle of the display panel in FIG. 5 when displaying a dark state;

9 is a flowchart of a method for manufacturing a display panel in an embodiment of the present invention;

10 is a schematic structural diagram of a first electrode layer and a first insulating layer formed on the surface of the first substrate in an embodiment of the present invention;

11 is a schematic structural diagram of forming a driving circuit layer and a second electrode layer on the surface of the second substrate in an embodiment of the present invention;

12 is a schematic structural diagram of a retaining wall structure formed on the second substrate according to an embodiment of the present invention;

13 is a schematic structural diagram of a second insulating layer formed on the surfaces of the second electrode layer and the retaining wall structure in an embodiment of the present invention.

Description of reference numerals

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, 520-particle , 511-first dispersion liquid, 512-second dispersion liquid, 600-retaining wall structure, 700-drive circuit layer, 800-first insulating layer, 900-second insulating layer.

Detailed ways

Embodiments of the present invention are described in detail below. The embodiments described below are exemplary, only for explaining the present invention, and should not be construed as limiting the present invention. If no specific technique or condition is indicated in the examples, the technique or condition described in the literature in the field or the product specification is used. The reagents used are not marked with the manufacturer, they are all conventional products that can be obtained from the market.

When the existing display panel displays the bright state, referring to FIG. 3 , the white particles move upward to the surface of the substrate, and the white particles cannot completely displace the black electrophoretic solution, thus causing the white particles to be mixed with the black electrophoretic solution. lower, the display effect is poor.

In order to improve the above-mentioned technical problems, the present invention provides a display panel. Referring to FIG. 4 , the display panel 1000 includes a first substrate 100 and a second substrate 200 arranged opposite to each other. The first substrate 100 is provided with a side close to the second substrate 200 The first electrode layer 300 and the second substrate 200 are 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, and the electronic ink units 500 are located between the first substrate 100 and the first substrate 100. Between the two substrates 200, each electronic ink unit 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 511. Dispersion 512, the first dispersion 511 and the second dispersion 512 are incompatible with each other, the first dispersion 511 is transparent, the first dispersion 511 is close to the light-emitting side of the display panel 1000, and the second dispersion 512 contains light absorbing Material. Therefore, under the action of the 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 invention are immiscible with each other, the first dispersion liquid 511 and the second dispersion liquid 512 are layered, and the layered interface is j (refer to FIG. 4 ). When the bright state is displayed, The white particles 520 move to the surface close to the light-emitting side of the display panel 1000, and the white particles 520 are mixed with the transparent first dispersion liquid 511. Compared with the existing single-particle display, the design of the present invention improves the bright state The reflectivity increases the contrast ratio of the display panel, thereby improving the display effect.

The present invention does not limit the shape of the electronic ink unit 500, and the shape of the electronic ink unit 500 may be a microcapsule (as shown in FIG. 4 ) or other shapes (as shown in FIG. 5 ).

According to an embodiment of the present invention, the display panel 1000 further includes a blocking wall structure 600 , and the blocking wall structure 600 is located between adjacent electronic ink units 500 . Therefore, the closed cavity formed by the first substrate 100 , the second substrate 200 , and the retaining wall structure 600 can be used as the electronic ink unit 500 . The dispersion liquid and a plurality of particles are distributed in the closed cavity. do not communicate with each other. Compared with the microcapsules, the shape of the e-ink unit in Figure 5 has a better display effect.

Referring to FIG. 6 , the retaining wall structures 600 are distributed along a first direction and a second direction, and the first direction and the second direction intersect. The retaining wall structure 600 defines the display panel 1000 into a non-light-emitting area and a plurality of light-emitting areas. There is an electronic ink unit 500 in each light emitting area. By controlling the electric field direction and voltage applied to the electronic ink unit 500, the movement of particles in the electronic ink unit 500 can be controlled, and the display effect of the light emitting area can be controlled.

The principle of the display panel 1000 of the present invention for displaying a bright state and a dark state will be described below.

Referring to FIG. 7 , by controlling the magnitude of 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 white particles 520 can be blocked by the external light. Reflection and scattering return, appearing white, the bright state.

Referring to FIG. 8 , by controlling the magnitude of 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 , that is, the white particles 520 enter the first electrode. In the second dispersion liquid 512, the external light entering the electronic ink unit 500 is absorbed by the second dispersion liquid 512 and the retaining wall structure 600 of the side wall, and appears black, that is, a dark state.

According to an embodiment of the present invention, referring to FIG. 5 , 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 and the retaining wall The orthographic projections of the structure 600 on the second substrate 200 do not overlap. Therefore, different voltages can be applied to different e-ink units 500, and the display effect of each e-ink unit 500 can be individually controlled; the blocking wall structure 600 can separate adjacent e-ink units 500 to avoid The ink unit 500 has a cross-color problem.

According to an embodiment of the present invention, referring to FIG. 5 , the display panel 1000 further includes a driving circuit layer 700 located between the second electrode layer 400 and the second substrate 200 ; thus, the driving circuit layer 700 can make the electronic ink The unit 500 is placed in an electric field, and the magnitude of the voltage and the direction of the electric field applied to the first electrode layer 300 and the second electrode layer 400 can be controlled by the driving circuit layer 700, so that the white particles 520 in the electronic ink unit 500 move in a directional manner. Color rendering.

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

In some embodiments of the present invention, the sub-driving circuit is located between the sub-electrodes 410 and the second substrate 200 , that is, under each sub-electrode 410 , and a sub-driving circuit is provided. That is, the orthographic projection of the sub-driving circuit on the second substrate 200 overlaps with the orthographic projection of the sub-electrode 410 on the second substrate 200 .

Since the particles 520 are charged, during the use of the display panel 1000, the particles 520 can reciprocate between the first electrode layer 300 and the second electrode layer 400 to perform color development; if the charged particles 520 are directly connected to the first electrode layer 300. The direct contact of the second electrode layer 400 will affect the chargeability of the particles 520, which will reduce the charge of the particles 520, or even make the particles 520 uncharged, resulting in the failure of the electronic ink unit 500 and affecting the normal display of the display panel 1000. . In order to improve this technical problem, referring to FIG. 5 , the present invention provides a first insulating layer 800 and a second insulating layer 900 in the display panel 1000 . 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 on the two substrates 200 covers the orthographic projection of the retaining wall structure 600 on the second substrate 200 . Therefore, during the use of the display panel 1000 , the charge carried by the particles 520 can be guaranteed to be stable and unchanged, thereby prolonging the service life of the display panel 1000 .

According to an embodiment of the present invention, the first dispersion liquid 511 and the second dispersion liquid 512 are independently selected from hydrophilic solvents or lipophilic solvents; that is, the first dispersion liquid 511 may be selected from hydrophilic solvents, The second dispersion liquid 512 is selected from lipophilic solvents; alternatively, the first dispersion liquid 511 may be selected from lipophilic solvents, and the second dispersion liquid 512 is selected from hydrophilic solvents.

The lipophilic solvent includes at least one of alkanes, aromatic hydrocarbons, halogenated hydrocarbons, and naphthenic compounds; further, the alkanes include isoparaffins.

Hydrophilic solvents include water.

According to an embodiment of the present invention, the light-absorbing material includes at least one of black dye, black hollow carbon spheres, and carbon nanotubes; thus, the light-absorbing material can absorb visible light.

The color of the retaining wall structure 600 is black; thus, when the dark state is displayed, after the external light enters the electronic ink unit 500, the external light can be absorbed by the retaining wall structure 600 on the side wall and the light absorbing material in the second dispersion 512 , renders black, and makes the display in the dark state better.

Exemplarily, the material for forming the retaining wall structure 600 may be black resin glue.

The material forming the particles 520 includes titanium dioxide, whereby the particles 520 appear white.

第二电极层400的厚度为

此时，显示面板具有更好的显示效果。According to the embodiment of the present invention, the thickness of the first electrode layer 300 is

The thickness of the second electrode layer 400 is

At this time, the display panel has a better display effect.

According to an embodiment of the present invention, the height of the retaining wall structure 600 is 5-50 μm; the height of the retaining wall refers to the length of the retaining wall structure 600 along the extending direction perpendicular to the first substrate 100 .

由此，可以对带电颗粒520起到保护作用，保证了颗粒520所带的电荷稳定不变，有效的延长了显示面板1000的使用寿命。如果第一绝缘层800的厚度过小，则不能有效的保护颗粒520所带的电荷稳定不变。如果第一绝缘层800的厚度过大，会影响透过率，进而导致显示效果变差。According to the embodiment of the present invention, the thickness of the first insulating layer 800 is

In this way, the charged particles 520 can be protected, and the charge carried by the particles 520 is guaranteed to be stable and unchanged, thereby effectively prolonging the service life of the display panel 1000 . If the thickness of the first insulating layer 800 is too small, the charge carried by the particles 520 cannot be effectively protected from being stable. If the thickness of the first insulating layer 800 is too large, the transmittance will be affected, and the display effect will be deteriorated.

由此，可以保证颗粒520所带的电荷稳定不变，进而延长显示面板1000的使用寿命。如果第二绝缘层900的厚度过小，则不能有效的保护颗粒520所带的电荷稳定不变。如果第二绝缘层900的厚度过大，会影响透过率，导致显示效果变差。According to the embodiment of the present invention, the thickness of the second insulating layer 900 is

In this way, the charge carried by the particles 520 can be guaranteed to be stable and unchanged, thereby prolonging the service life of the display panel 1000 . If the thickness of the second insulating layer 900 is too small, the charge carried by the particles 520 cannot be effectively protected to remain stable. If the thickness of the second insulating layer 900 is too large, the transmittance will be affected, resulting in poor display effect.

According to an embodiment of the present invention, the material for forming the first substrate 100 and the material for forming the second substrate 200 include glass; the material for forming the first electrode layer 300 and the material for forming the second electrode layer 400 include ITO; the first insulating layer is formed The material of 800 and the material forming the second insulating layer 900 include SiO. Therefore, it can ensure that the first substrate 100 , the first electrode layer 300 and the first insulating layer 800 are transparent, that is, the structure near the light-emitting side of the display panel 1000 is transparent, which can ensure that the display panel 1000 has a better display effect .

The present invention also provides a method for manufacturing a display panel, with reference to FIG. 9 , the method includes:

S100, providing a first substrate and a second substrate

The material forming the first substrate and the material forming the second substrate include glass.

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

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 can protect the internal structure of 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.

After forming the first electrode layer, the method further includes the step of forming a first insulating layer on the side of the first electrode layer away from the first substrate, and the obtained structure is shown in FIG. 10 .

S300, forming a second electrode layer on one side of the second substrate;

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.

In some embodiments of the present invention, before forming the second electrode layer, the method includes: forming a driving circuit layer on one side of the second substrate, and then forming an electrode layer on a side of the driving circuit layer away from the second substrate, The electrode layer is then patterned to form a second electrode layer, and the obtained structure is shown in Figure 11, and then a retaining wall structure is formed on the surface of the driving circuit layer not covered by the second electrode layer, and the obtained structure is shown in Figure 12 As shown, a second insulating layer is subsequently formed on the side of the second electrode layer and the retaining wall structure away from the driving circuit layer, and the resulting structure is shown in FIG. 13 .

Specifically, a conventional exposure and development process can be used to fabricate the driving circuit layer, and the blocking wall structure can be fabricated through an exposure and development process.

S400, assembling the first substrate and the second substrate, and 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 display panel includes a plurality of electronic ink units, the particles have electric charges, and the color of the particles is white; the dispersion liquid includes a first dispersion liquid and a second dispersion liquid, the first dispersion liquid and the The second dispersion liquid is incompatible with each other; the first dispersion liquid is transparent, and the first dispersion liquid is close to the light emitting side of the display panel; the second dispersion liquid contains a light absorbing material.

According to an embodiment of the present invention, the manner of injecting the dispersion liquid and the plurality of particles may be injection or inkjet printing.

Injecting the dispersion and the plurality of particles includes: injecting the second dispersion first and then the first dispersion; wherein the particles may be mixed into the first dispersion and/or the second dispersion and added.

For example, the second dispersion liquid in which a plurality of particles are mixed may be injected first, and then the first dispersion liquid may be injected. Alternatively, the second dispersion liquid may be injected first, followed by the injection of the first dispersion liquid in which the plurality of particles are mixed. Alternatively, the second dispersion liquid mixed with a part of the particles may be injected first, and then the first dispersion liquid mixed with another part of the particles may be injected.

Therefore, the display panel prepared by the method can improve the reflectivity in the bright state, thereby improving the contrast ratio and having a better display effect.

In some embodiments of the present invention, the display panel produced by the method has the same structure as the display panel described above, and thus, the method has all the features and advantages of the display panel described above. , and will not be repeated here.

The present invention also provides a display device, which includes the aforementioned display panel. Therefore, the display device has all the features and advantages of the aforementioned display panel, which will not be repeated here. In general, the display device can improve the reflectivity in the bright state, thereby improving the contrast ratio and having a better display effect.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, only for the purpose of It is convenient to describe the present invention and to simplify the description, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

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

In the description of this specification, reference to the terms "one embodiment", "another embodiment", "some embodiments", "example", "specific example", or "some examples" or the like is meant to be used in conjunction with the description A particular feature, structure, material, or characteristic described by an example or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

Although the embodiments of the present invention have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present invention. Embodiments are subject to variations, modifications, substitutions and variations.

Claims (10)

1. The display panel is characterized by comprising a first substrate and a second substrate which are oppositely arranged, wherein a first electrode layer is arranged on one side of the first substrate close to the second substrate, and a second electrode layer is arranged on one side of the second substrate 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 electronic ink unit is internally provided with dispersion liquid and a plurality of particles;

the particles have an electric charge and the color of the particles is white; the display panel comprises a display panel and a light source, wherein the display panel comprises a display panel and a light source, the light source is arranged on the display panel, 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 close to the light emitting side of the display panel.

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

3. The display panel according to claim 2, wherein the first electrode layer is a face electrode;

the second electrode layer comprises a plurality of sub-electrodes arranged at intervals, and the orthographic projections of the sub-electrodes on the second substrate are not overlapped with the orthographic projections of the retaining wall structures on the second substrate.

4. The display panel according to claim 3, further comprising a driving circuit layer between the second electrode layer and the second substrate;

and a plurality of sub-driving circuits are arranged in the driving circuit layer, and the number of the sub-driving circuits is the same as that of the sub-electrodes.

5. The display panel according to claim 2, further comprising a first insulating layer on a side of the first electrode layer away from the first substrate, and a second insulating layer on a side of the second electrode layer away from the second substrate;

and the orthographic projection of the second insulating layer on the second substrate covers the orthographic projection of the retaining wall structure on the second substrate.

6. The display panel according to claim 1, wherein the first dispersion liquid and the second dispersion liquid are each independently selected from a hydrophilic solvent or an oleophilic solvent;

the oleophilic solvent comprises at least one of alkane compounds, aromatic compounds, halogenated hydrocarbon compounds and naphthenic compounds;

the hydrophilic solvent includes water.

7. The display panel according to claim 2, wherein the light absorbing material comprises at least one of a black dye, black hollow carbon spheres, carbon nanotubes;

the color of the retaining wall structure is black;

the material forming the particles comprises titanium dioxide.

8. The display panel according to claim 5, wherein the display panel satisfies at least one of the following conditions:

the thickness of the first electrode layer is

The first insulating layer has a thickness of

The thickness of the second electrode layer is

The height of the retaining wall structure is 5-50 mu m;

the second insulating layer has a thickness of

The material forming the first substrate and the material forming the second substrate include glass; the material forming the first electrode layer and the material forming the second electrode layer include ITO; the material forming the first insulating layer and the material forming the second insulating layer include SiO.

9. A method of making 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;

injecting a dispersion and a plurality of particles between the first substrate and the second substrate to form an electronic ink unit;

the first electrode layer is positioned on one side of the first substrate close to the second substrate, and the second electrode layer is positioned on one side of the second substrate close to the first substrate;

the display panel includes a plurality of electronic ink units, the particles have an electric charge, and the color of the particles is white; the dispersion comprises a first dispersion and a second dispersion, and the first dispersion and the second dispersion are immiscible;

the first dispersion is transparent, and the first dispersion is close to the light emitting side of the display panel; the second dispersion liquid contains a light absorbing material.

10. A display device characterized in that it comprises a display panel according to any one of claims 1 to 8.

Images