Display device, preparation method and display equipment

Abstract

The invention relates to a display device, a preparation method and display equipment, the display device comprises a first substrate, a second substrate and an electrophoresis layer, the first substrate is close to a light emitting side, the electrophoresis layer comprises a plurality of electrophoresis units and a plurality of light-tight retaining wall structures, and the retaining wall structures are located between any two adjacent electrophoresis units. Any two electrophoresis units are not connected; the electrophoresis unit comprises a first electrode, a second electrode and charged particles, the first electrode and the second electrode are oppositely arranged, the charged particles are located between the first electrode and the second electrode, the first electrode is close to the first substrate, the second electrode is close to the second substrate, the voltage intensity of the first electrode is recorded as a first voltage, and the voltage intensity of the second electrode is recorded as a second voltage; the absolute value of the first voltage is greater than that of the second voltage. The technical problem that when the electric field intensities needed by particle movement in all pixel display units are different, dark-state light leakage or bright-state brightness insufficiency of part of display areas occurs is solved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display device, a preparation method and a display equipment. Background Art

[0002] In recent years, electronic paper display devices have been widely used in conference nameplates, supermarket labels, public transportation billboards, and e-reader displays because of their thinness, softness, and erasability, which meet the needs of users.

[0003] In the related art, electronic paper is mainly composed of a common electrode, an electronic ink film layer and a pixel electrode, and the common electrode is closer to the light-emitting side. When a high voltage is provided to the pixel electrode and a low voltage is provided to the common electrode, an electric field is formed from bottom to top, which controls the movement of particles with different charges in the electronic ink film layer to reflect or absorb ambient light, thereby realizing bright or dark display.

[0004] However, in the related art, due to differences in the manufacturing process, the thickness of each film layer is different, resulting in different distances between the common electrode and the pixel electrode in each pixel display unit, that is, the electric field strength required for the movement of particles in each pixel display unit is different, and the pixel electrode voltage is higher than the voltage of the common electrode. Therefore, when the same voltage is applied to each pixel display unit, for pixel display units with a long distance between the pixel electrode and the common electrode, the charged particles will be arranged in a disordered manner. The packing density of particles close to the light-emitting side is insufficient, and there are gaps between the disordered particles. Ambient light enters from the gaps, resulting in light leakage in the dark state or insufficient brightness in the bright state, resulting in problems such as a dull color gamut. Summary of the invention

[0005] The present application aims to provide a display device, a preparation method and a display equipment to solve the technical problem in the related art that some display areas of an electronic paper display device leak light in a dark state or have insufficient brightness in a bright state, resulting in a dull color gamut.

[0006] In a first aspect, an embodiment of the present application proposes a display device, comprising a first substrate, a second substrate and an electrophoretic layer, wherein the first substrate and the second substrate are arranged opposite to each other, and the first substrate is close to the light emitting side, and the electrophoretic layer is located between the first substrate and the second substrate.

[0007] The electrophoretic layer includes a plurality of electrophoretic units and a plurality of non-transparent retaining wall structures, wherein the retaining wall structure is located between any two adjacent electrophoretic units so that any two electrophoretic units are not connected; the electrophoretic unit includes a first electrode, a second electrode and charged particles, wherein the first electrode and the second electrode are arranged opposite to each other, and the charged particles are located between the first electrode and the second electrode, the first electrode is close to the first substrate, and the second electrode is close to the second substrate, the voltage intensity of the first electrode is recorded as the first voltage, and the voltage intensity of the second electrode is recorded as the second voltage, and the absolute value of the first voltage is greater than the absolute value of the second voltage.

[0008] In a possible implementation, the charged particles include first electrophoretic particles and second electrophoretic particles with opposite electrical properties, the first electrophoretic particles are used to reflect light, and the second electrophoretic particles are used to absorb light.

[0009] In a possible implementation manner, a color filter film is further included, which is located between the first substrate and the electrophoretic layer, and the color filter film includes a filter portion and a light shielding portion.

[0010] The color filter film includes a filter portion and a light shielding portion. The filter portion is projected on the second substrate as a first projection. The electrophoresis unit is projected on the second substrate as a second projection. The first projection covers the second projection.

[0011] In a possible implementation, the display device further includes a driving circuit layer, the driving circuit layer includes a plurality of driving switches, the driving switches are projected on the second substrate as a third projection, the shading portion is projected on the second substrate as a fourth projection, and the fourth projection covers the third projection.

[0012] In a possible implementation, the first electrode includes a first portion, and the first portion is arranged parallel to the color filter film.

[0013] In one possible implementation, the first electrode or the second electrode includes a second part, the first part is connected to the second part, the driving switch includes a gate layer, a source layer and a drain layer, the first part is electrically connected to the drain layer, and the second electrode is electrically connected to the source layer.

[0014] In a possible implementation, an inorganic protective layer is further included, which is located between the color filter film and the driving circuit layer.

[0015] In a second aspect, an embodiment of the present application provides a method for manufacturing a display device, comprising:

[0016] A first substrate is provided.

[0017] An electrophoretic layer is formed on the first substrate.

[0018] The second substrate is packaged on the electrophoretic layer.

[0019] Among them, the first substrate is close to the light output side, the electrophoretic layer includes a plurality of electrophoretic units and a plurality of retaining wall structures, the retaining wall structure is located between any two adjacent electrophoretic units so that any two electrophoretic units are not connected; the electrophoretic unit includes a first electrode, a second electrode and charged particles, the first electrode and the second electrode are arranged opposite to each other, the charged particles are located between the first electrode and the second electrode, the first electrode is close to the first substrate, the second electrode is close to the second substrate, the voltage strength of the first electrode is recorded as the first voltage, the voltage strength of the second electrode is recorded as the second voltage, and the absolute value of the first voltage is greater than the absolute value of the second voltage.

[0020] In a possible implementation, the electrophoretic layer on the first substrate includes:

[0021] Forming non-light-transmissive barrier wall structures that are spaced and distributed on the first substrate;

[0022] An electrophoresis unit is formed between two adjacent retaining wall structures.

[0023] In a third aspect, an embodiment of the present application provides a display device, including:

[0024] A display device as mentioned in the first aspect, and a power supply module for supplying power to the display device.

[0025] A display device, a preparation method and a display equipment provided by an embodiment of the present application, the display device includes a first substrate, a second substrate and an electrophoretic layer, the first substrate and the second substrate are arranged opposite to each other, and the first substrate is close to the light output side, the electrophoretic layer is located between the first substrate and the second substrate, the electrophoretic layer includes a plurality of electrophoretic units and a plurality of non-light-transmissive retaining wall structures, the retaining wall structure is located between any two adjacent electrophoretic units so that any two electrophoretic units are not connected, the electrophoretic unit includes a first electrode, a second electrode and charged particles, the first electrode and the second electrode are arranged opposite to each other, the charged particles are located between the first electrode and the second electrode, the first electrode is close to the first substrate, the second electrode is close to the second substrate, the voltage intensity of the first electrode is recorded as the first voltage, the voltage intensity of the second electrode is recorded as the second voltage, and the absolute value of the first voltage is greater than the absolute value of the second voltage. Compared with the related art in which multiple electrophoretic units share a common electrode, that is, the voltage on one side of the common electrode of multiple electrophoretic units is the same, the present application sets an independent first electrode and a second electrode in each electrophoretic unit to individually control the display of the electrophoretic unit, and the absolute value of the first voltage is greater than the absolute value of the second voltage. The first electrode with a stronger voltage is placed close to the light-emitting side, so that the charged particles are evenly and neatly arranged on one side of the first electrode. Even close to the light-emitting side, the charged particles are evenly and neatly arranged, avoiding gaps between the charged particles, thereby avoiding ambient light from entering from the gaps. This solves the technical problem that when there is a difference in the thickness of each film layer, resulting in different electric field strengths required for particle movement in each pixel display unit, some display areas leak light in the dark state or the brightness in the bright state is insufficient, resulting in a dull color gamut. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The features, advantages and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings. In the accompanying drawings, the same reference numerals are used for the same components. The accompanying drawings are not drawn according to the actual scale, but are only used to illustrate the relative position relationship. The layer thickness of some parts is exaggerated for easy understanding, and the layer thickness in the accompanying drawings does not represent the proportional relationship of the actual layer thickness.

[0027] Figure 1 A schematic diagram showing the structure of a display device in the related art is shown;

[0028] Figure 2 A schematic diagram showing the structure of a display device provided in Embodiment 1 of the present application is shown;

[0029] Figure 3 A specific structural schematic diagram of a display device provided in Embodiment 1 of the present application when the first electrode is a pixel electrode is shown;

[0030] Figure 4 A specific structural schematic diagram of another display device provided in the first embodiment of the present application when the first electrode is a pixel electrode is shown;

[0031] Figure 5 A schematic diagram showing a process of a method for preparing a display device provided in Embodiment 2 of the present application;

[0032] Figure 6 A structural schematic diagram corresponding to the method for preparing a display device provided in Embodiment 2 of the present application is shown;

[0033] Figure 7 A schematic structural diagram of a display device provided in Embodiment 3 of the present application is shown.

[0034] Reference numerals:

[0035] 100. Display device;

[0036] 10. a first substrate;

[0037] 20, driving circuit layer; 21, driving switch; 211, gate layer; 212, source layer; 213, drain layer; 214, gate insulation layer; 215, planar layer;

[0038] 30. electrophoretic layer; 31. first electrode; 311. first part; 312. second part; 32. second electrode; 33. charged particles; 331. first electrophoretic particles; 332. second electrophoretic particles; 34. electrophoretic unit; 35. retaining wall structure;

[0039] 40. a second substrate;

[0040] 50, color filter film; 51, filter portion; 52, light shielding portion;

[0041] 60. Inorganic protective layer;

[0042] 200, power supply module;

[0043] 300. Display device. DETAILED DESCRIPTION

[0044] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least part of the known structures and technologies are not shown to avoid unnecessary ambiguity in the present application; and, for clarity, the size of the regional structure may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

[0045] In the related art, electronic paper is mainly composed of a common electrode, an electronic ink film layer and a pixel electrode, and the common electrode is closer to the light-emitting side. A high voltage is provided to the pixel electrode, and a low voltage is provided to the common electrode, forming an electric field from bottom to top, controlling the movement of particles with different charges in the electronic ink film layer to reflect or absorb ambient light, thereby achieving bright or dark display.

[0046] However, in the related art, due to differences in the manufacturing process, the thickness of each film layer is different, resulting in different distances between the common electrode and the pixel electrode in each pixel display unit, that is, the electric field strength required for the movement of particles in each pixel display unit is different, and the pixel electrode voltage is higher than the voltage of the common electrode. Therefore, when the same voltage is applied to each pixel display unit, for pixel display units with a long distance between the pixel electrode and the common electrode, the charged particles will be arranged in a disordered manner. The packing density of particles close to the light-emitting side is insufficient, and there are gaps between the disordered particles. Ambient light enters from the gaps, resulting in light leakage in the dark state or insufficient brightness in the bright state, resulting in problems such as a dull color gamut.

[0047] In view of this, the embodiments of the present application provide a display device, a preparation method and a display equipment. By making the first electrode close to the light-emitting side and the second electrode close to the backlight side, and the absolute value of the first voltage is greater than the absolute value of the second voltage, the charged particles are evenly and neatly arranged on one side of the first electrode. Even if the charged particles are close to the light-emitting side, gaps between the charged particles are avoided, thereby preventing ambient light from entering through the gaps. This solves the technical problem that when there is a difference in the thickness of each film layer, resulting in different electric field strengths required for particle movement in each pixel display unit, some display areas leak light in the dark state or the brightness in the bright state is insufficient, resulting in a dull color gamut.

[0048] The specific structures and processes of the display device, preparation method and display equipment provided by each embodiment of the present application are described below in conjunction with the accompanying drawings.

[0049] First embodiment

[0050] Figure 1 A schematic structural diagram of a display device 100 in the related art is shown; Figure 2 A schematic structural diagram of a display device 100 provided in Embodiment 1 of the present application is shown.

[0051] like Figure 1 As shown, the display device 100 in the related art includes a first substrate 10, a second substrate 40, an electrophoretic layer 30 and a driving circuit layer 20. The electrophoretic layer 30 includes a first electrode 31, a second electrode 32 and charged particles 33. The voltage of the first electrode 31 is greater than the voltage of the second electrode 32, and the second electrode 32 is closer to the light-emitting side than the first electrode 31. Specifically, Figure 1 In the display device, the first electrode 31 is a pixel electrode, and the second electrode 32 is a common electrode. Since multiple display units share the same common electrode, the voltage on one side of the common electrode of the multiple display units is the same, which is about 0-+5V. When the voltage of the second electrode 32 is lower than the voltage of the first electrode 31, that is, the voltage of the common electrode is lower than the voltage of the pixel electrode, the charged particles 33 close to the common electrode are arranged in a disordered manner, that is, the charged particles 33 close to the light-emitting side are arranged in a disordered manner, and the charged particles 33 far from the light-emitting side are arranged in an orderly manner. Gaps appear between the charged particles 33 close to the light-emitting side, and the light in the environment enters from the gaps between the charged particles 33, affecting the display quality.

[0052] like Figure 2-Figure 4 As shown, the first embodiment of the present application provides a display device 100, including a first substrate 10, a second substrate 40 and an electrophoretic layer 30. The first substrate 10 and the second substrate 40 are arranged opposite to each other, and the first substrate 10 is close to the light emitting side, and the electrophoretic layer 30 is located between the first substrate 10 and the second substrate 40.

[0053] The electrophoretic layer 30 includes a plurality of electrophoretic units 34 and a plurality of non-transparent retaining wall structures 35, wherein the retaining wall structure 35 is located between any two adjacent electrophoretic units 34 so that any two electrophoretic units 34 are not connected; the electrophoretic unit 34 includes a first electrode 31, a second electrode 32 and a charged particle 33, wherein the first electrode 31 and the second electrode 32 are arranged opposite to each other, and the charged particle 33 is located between the first electrode 31 and the second electrode 32, the first electrode 31 is close to the first substrate 10, and the second electrode 32 is close to the second substrate 40, the voltage intensity of the first electrode 31 is recorded as the first voltage, and the voltage intensity of the second electrode 32 is recorded as the second voltage, and the absolute value of the first voltage is greater than the absolute value of the second voltage.

[0054] Compared with the prior art, the two electrophoretic units 34 are not connected, that is, the electrode voltage in the electrophoretic unit 34 can be controlled separately in the present application. The absolute value of the second voltage is the absolute value of the electrode voltage close to the backlight side or the absolute value of the electrode voltage close to the light-emitting side in the related art. And the retaining wall structure 35 prevents the light reflected by the two adjacent electrophoretic units 34 from affecting each other.

[0055] In one embodiment, the first substrate 10 and the second substrate 40 are mainly used to support the display device 100, and can be a rigid substrate made of glass, or can be made of an insulating material such as a polymer resin (polyethersulfone (PES), polyacrylate (PA), polyarylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyallylate, polyimide (PI), polycarbonate (PC), cellulose triacetate (CAT), cellulose acetate propionate (CAP) or a combination thereof.

[0056] In another embodiment, the first substrate 10 and the second substrate 40 may also be flexible substrates made of materials such as polyimide (PI). That is, the display device 100 of the present application is not limited to being rigid and non-bendable, but may also be flexible and bendable.

[0057] Specifically, in the present embodiment, the first substrate 10 is close to the light-emitting side, and the second substrate 40 is close to the backlight side, that is, the light in the environment first enters through the first substrate 10, and the first substrate 10 is a light-transmitting material, and the influence on the light can be ignored. Among them, the first electrode 31 can be a pixel electrode or a common electrode. If the first electrode 31 is a pixel electrode, the second electrode 32 is a common electrode; if the first electrode 31 is a common electrode, the second electrode 32 is a pixel electrode. The present application only limits the absolute value of the voltage of the first electrode 31 close to the light-emitting side to be greater than the absolute value of the voltage of the second electrode 32 close to the backlight side. The electrical properties of the first electrode 31 and the second electrode 32 are opposite, and the present application does not limit the electrical properties of the charges carried by the first electrode 31 and the second electrode 32. Even in a pixel display unit where the distance between the pixel electrode and the common electrode is far, since the voltage on one side of the first electrode 31 is high, the charged particles 33 on one side of the first electrode 31 are arranged neatly and orderly, that is, the charged particles 33 close to the light-emitting side are arranged closely, and there are no gaps between the charged particles 33, thereby preventing ambient light from entering through the gaps and affecting the picture display.

[0058] Exemplarily, when the first electrode 31 is a pixel electrode, the second electrode 32 is a common electrode, and the absolute value of the voltage of the common electrode is conventionally set, the absolute value of the voltage of the pixel electrode on the light-emitting side is larger, and the charged particles 33 on the light-emitting side are arranged closely. When the first electrode 31 is a common electrode, the second electrode 32 is a pixel electrode, and the absolute value of the voltage of the common electrode on the light-emitting side is larger, the charged particles 33 on the light-emitting side are arranged closely. Since each electrophoretic unit 34 is arranged at intervals in the present application, the electrode voltage in the electrophoretic unit 34 can be controlled individually. When the screen is switched, it can still be ensured that the absolute value of the voltage of the first electrode 31 is greater than the absolute value of the second electrode 32. In the related art, since all electrophoretic units 34 share a common electrode, and the common electrode is located on the light-emitting side, when the screen is switched, the movement of the charged particles can be achieved only by adjusting the voltage of the pixel electrode and controlling the difference between the absolute value of the pixel electrode voltage and the absolute value of the common electrode voltage. During this process, the absolute value of the voltage of the common electrode may be greater than the absolute value of the voltage of the pixel electrode, that is, the charged particles on the light-emitting side are unevenly arranged, and ambient light enters from the gaps, causing dark-state light leakage or insufficient bright-state brightness in this part of the display device, and the color gamut is not bright.

[0059] In this embodiment, the present application places the first electrode with a larger voltage close to the light-emitting side, so that the charged particles 33 are evenly and neatly arranged on one side of the pixel electrode. Even if the charged particles 33 on the light-emitting side are evenly and neatly arranged, gaps between the charged particles 33 are avoided, thereby preventing ambient light from entering from the gaps. This solves the technical problem that when there is a difference in the thickness of each film layer, resulting in different electric field strengths required for particle movement in each pixel display unit, some display areas leak light in the dark state or the brightness in the bright state is insufficient, resulting in a dull color gamut.

[0060] Figure 3 A specific structural schematic diagram of a display device provided in Embodiment 1 of the present application when the first electrode is a pixel electrode is shown.

[0061] like Figure 3 As shown, in some embodiments, the charged particles 33 include first electrophoretic particles 331 and second electrophoretic particles 332 with opposite electrical properties. The first electrophoretic particles 331 are used to reflect light, and the second electrophoretic particles 332 are used to absorb light.

[0062] Specifically, the first electrophoretic particles 331 and the second electrophoretic particles 332 are white electrophoretic particles and black electrophoretic particles, respectively, wherein the white electrophoretic particles can reflect light in the external environment, and the black electrophoretic particles can absorb light in the external environment.

[0063] When the first electrophoretic particle 331 is close to the first electrode 31, and the second electrophoretic particle 332 is close to the second electrode 32, that is, the white electrophoretic particle is close to the pixel electrode on the light-emitting side, and the black electrophoretic particle is close to the common electrode, the light in the environment shines on the white electrophoretic particle, and the white electrophoretic particle reflects the light, and the display device 100 displays white light, and the white light enters the human eye. At this time, the display device 100 is in a bright state. Since the voltage of the pixel electrode is higher, the white electrophoretic particles are arranged neatly, and there are no gaps between the white electrophoretic particles, that is, all the light in the environment is reflected, ensuring the brightness of the display device 100.

[0064] When the second electrophoretic particles 332 are close to the first electrode 31, and the first electrophoretic particles 331 are close to the second electrode 32, that is, the black electrophoretic particles are close to the pixel electrode on the light-emitting side, and the white electrophoretic particles are close to the common electrode, the light in the environment is irradiated on the black electrophoretic particles, and the black electrophoretic particles absorb the light, and the display device 100 has no light emitted, that is, no light enters the human eye, and the display device 100 is in a dark state. Since the voltage of the pixel electrode is higher, the black electrophoretic particles are arranged neatly, and there are no gaps between the black electrophoretic particles, that is, all the light in the environment is absorbed, avoiding light leakage in the dark state of the display device 100.

[0065] For example, in the present application, when the white electrophoretic particles are positively charged and the black electrophoretic particles are negatively charged, in the first screen, the voltage of the first electrode 31 is +3V, and the voltage of the second electrode 32 is -1V. At this time, the white electrophoretic particles are close to the second electrode 32, and the black electrophoretic particles are close to the first electrode 31, and the electrophoretic unit 34 is in a dark state; when the screen is switched, the voltage of the first electrode 31 is -3V and the voltage of the second electrode 32 is +1V in the second screen. At this time, the white electrophoretic particles are close to the first electrode 31, and the black electrophoretic particles are close to the second electrode 32, and the electrophoretic unit 34 is in a bright state. It can be seen that in the present application, regardless of the bright state or the dark state, the absolute value of the voltage of the first electrode 31 close to the light-emitting side is always greater than the absolute value of the voltage of the second electrode 32 on the backlight side, that is, the white electrophoretic particles or the black electrophoretic particles close to the light-emitting side are arranged neatly to prevent ambient light from entering from the gap.

[0066] In the related art, the example of white electrophoretic particles carrying positive charge and black electrophoretic particles carrying negative charge is still taken. In the first screen, the voltage of the common electrode close to the light-emitting side is still +3V, and the voltage of the pixel electrode is +1V. At this time, the white electrophoretic particles are close to the pixel electrode, and the black electrophoretic particles are close to the common electrode. At this time, it is a dark state, and the absolute value of the voltage of the common electrode on the light-emitting side is larger. The black electrophoretic particles are arranged evenly without gaps. However, when the screen is switched, in order to make the second screen appear bright, the white electrophoretic particles with positive charge are close to the common electrode, and the black electrophoretic particles with negative charge are close to the pixel electrode. Since all electrophoretic units 34 share a common electrode, the voltage of the common electrode is fixed and remains +3V, so the pixel electrode voltage needs to be increased so that the pixel electrode voltage is greater than the common voltage, such as the pixel electrode voltage is +5V. At this time, since the absolute value of the pixel electrode voltage is greater than the absolute value of the common electrode voltage, when the distance between the pixel electrode and the common electrode in the electrophoretic unit 34 is large, the black electrophoretic particles close to the backlight side are arranged neatly, while the white electrophoretic particles close to the light-emitting side are arranged chaotically, and there is a gap between the two white electrophoretic particles. At this time, external light enters through the gap, causing the electrophoretic unit to have a problem of reduced darkness.

[0067] In some embodiments, a color filter film 50 is further included and is located between the first substrate 10 and the electrophoretic layer 30 . The color filter film 50 includes a filter portion 51 and a light shielding portion 52 .

[0068] The orthographic projection of the filter portion 51 on the second substrate 40 is recorded as a first projection, and the orthographic projection of the electrophoresis unit 34 on the second substrate 40 is recorded as a second projection. The first projection covers the second projection.

[0069] The filter unit 51 includes a red light unit, a green light unit and a blue light unit, so that light in the environment emits red light, green light and blue light after passing through the red light unit, the green light unit and the blue light unit, thereby enabling the display device 100 to achieve color display.

[0070] Specifically, the color filter film 50 may be disposed on the first substrate 10 , and in this case, the first substrate 10 may be referred to as a color filter substrate.

[0071] The electrophoretic unit 34 may further include an electrophoretic liquid, so that the first electrophoretic particles 331 and the second electrophoretic particles 332 are immersed in the electrophoretic liquid. The electrophoretic liquid is a transparent insulating liquid, and the first electrophoretic particles 331 and the second electrophoretic particles 332 are uniformly dispersed in the electrophoretic liquid.

[0072] The first projection covers the second projection, that is, the area of ​​the filter portion 51 is greater than or equal to the positive projection of the electrophoretic unit 34. Since there is an angle between the light reflected by the first electrophoretic particle 331 and the incident ambient light, when the first projection is greater than the second projection, most of the light reflected by the first electrophoretic particle 331 can pass through the filter portion 51, reducing the situation where the light reflected by the first electrophoretic particle 331 is irradiated on the light shielding portion 52, avoiding light waste, and reducing the brightness of the display device 100.

[0073] In some embodiments, the display device 100 also includes a driving circuit layer 20, the driving circuit layer 20 includes multiple driving switches 21, the driving switch 21 is projected on the second substrate 40 as a third projection, and the shading portion 52 is projected on the second substrate 40 as a fourth projection, and the fourth projection covers the third projection.

[0074] The driving circuit layer 20 is connected to the pixel electrode. Specifically, when the pixel electrode is the first electrode 31, the driving circuit layer 20 is located on the light-emitting side of the first electrode 31, that is, the driving circuit layer 20 is located between the first electrode 31 and the color filter film 50, or between the first electrode 31 and the first substrate 10. When the pixel electrode is the second electrode 32, the driving circuit layer is located between the second electrode 32 and the second substrate 40. The structure in which the pixel electrode is the second electrode 32 is not shown in the drawings of the specification.

[0075] The fourth projection covers the third projection, that is, the third projection does not overlap with the first projection and the second projection, so as to avoid the driving switch 21 blocking the electrophoresis unit 34 and avoid affecting the incidence and emission of ambient light, thereby ensuring the quality of the displayed image.

[0076] In some embodiments, the first electrode 31 includes a first portion 311 , and the first portion 311 is disposed parallel to the color filter film 50 .

[0077] Since the absolute value of the voltage of the first electrode 31 is greater than the absolute value of the voltage of the second electrode 32, the charged particle 33 is parallel to the first portion 311 of the first electrode 31. Figure 4 situation. Figure 4FIG. 1 is a schematic diagram showing a specific structure of another display device 100 provided in the first embodiment of the present application when the first electrode is a pixel electrode. Figure 4 As shown, when the first portion 311 is not parallel to the color filter film 50, that is, the first electrophoretic particle 331 is not parallel to the color filter film 50, part of the light reflected by it enters the light shielding portion 52. And because the first electrophoretic particle 331 is not parallel to the color filter film 50, the distances between each first electrophoretic particle 331 and the first substrate 10 are not equal. For the first electrophoretic particle 331 at a short distance, the attenuation of its reflected light during the transmission process is small; while for the first electrophoretic particle 331 at a long distance, the attenuation of its reflected light during the transmission process is large. As a result, the light intensity received by the user is different, which reduces the user experience.

[0078] In some embodiments, the first electrode 31 or the second electrode 32 includes a second part 312, the first part 311 is connected to the second part 312, the driving switch 21 includes a gate layer 211, a source layer 212 and a drain layer 213, the first part 311 is electrically connected to the drain layer 213, and the second electrode 32 is electrically connected to the source layer 212 (not shown in the figure).

[0079] The pixel electrode includes a second portion 312. When the pixel electrode is the first electrode 31, the first electrode 31 includes the second portion 312; when the pixel electrode is the second electrode 32, the second electrode 32 includes the second portion 312. The drawings only take the pixel electrode as the first electrode 31 as an example, and do not show the structure of the pixel electrode as the second electrode 32.

[0080] The gate layer 211 may be made of metals such as Al, Cu, and Mo; the source layer 212 and the drain layer 213 may be made of metals such as Al, Cu, and Mo. An active layer is disposed between the source layer 212 and the drain layer 213 and may be made of polysilicon.

[0081] Specifically, a gate insulating layer 214 is provided between the gate layer 211 and the source layer 212 or the drain layer 213, and the material thereof is silicon nitride SiNx and silicon oxide SiOx. A flat layer 215 is provided between the source layer 212 or the drain layer 213 and the electrophoretic layer 30. It is worth noting that a groove is provided on the flat layer 215, and the second portion 312 of the first electrode 31 is electrically connected to the drain layer 213 through the groove.

[0082] In some embodiments, an inorganic protective layer 60 is further included, located between the color filter film 50 and the driving circuit layer 20. The inorganic protective layer 60 is used to prevent the color filter film 50 from being etched when preparing the driving circuit layer 20. The inorganic protective layer 60 is usually made of transparent silicon nitride SiNx.

[0083] In this embodiment, the present application places the pixel electrode with a larger voltage close to the light-emitting side, so that the charged particles 33 are arranged uniformly and neatly on one side of the pixel electrode. Even if the charged particles 33 on the light-emitting side are arranged uniformly and neatly, gaps between the charged particles 33 are avoided, thereby preventing ambient light from entering from the gaps. This solves the technical problem that when there are differences in the thickness of each film layer, resulting in different electric field strengths required for particle movement in each pixel display unit, some display areas leak light in the dark state or the brightness in the bright state is insufficient, resulting in a dull color range. For a display device 100 that can present a color image, the area of ​​the filter portion 51 is greater than or equal to the positive projection of the electrophoretic unit 34, reducing the situation where the light reflected by the first electrophoretic particle 331 is irradiated on the shading portion 52, avoiding light waste, and ensuring the brightness of the display device 100. Avoid driving the switch 21 to block the electrophoretic unit 34, thereby avoiding affecting the incidence and emission of ambient light and ensuring the quality of the displayed image. The first portion 311 of the first electrode 31 is arranged parallel to the color filter film 50. On the one hand, it prevents part of the light reflected by the first electrophoretic particle 331 from entering the light shielding portion 52, thereby reducing the brightness of the display screen; on the other hand, it prevents the light intensity received by the user from being different, thereby ensuring the user experience. An inorganic protective layer 60 is arranged between the color filter film 50 and the driving circuit layer 20 to protect the color filter film 50.

[0084] Second embodiment

[0085] Figure 5 A schematic flow chart of a method for preparing a display device provided in Embodiment 2 of the present application is shown.

[0086] like Figure 5 As shown, Embodiment 2 of the present application provides a method for manufacturing a display device, comprising:

[0087] Step S101: providing a first substrate.

[0088] Step S102: forming an electrophoretic layer on the first substrate.

[0089] Step S103: packaging a second substrate on the electrophoretic layer.

[0090] Among them, the first substrate is close to the light output side, the electrophoretic layer includes a plurality of electrophoretic units and a plurality of retaining wall structures, the retaining wall structure is located between any two adjacent electrophoretic units so that any two electrophoretic units are not connected, the electrophoretic unit includes a first electrode, a second electrode and charged particles, the first electrode and the second electrode are arranged opposite to each other, the charged particles are located between the first electrode and the second electrode, the first electrode is close to the first substrate, the second electrode is close to the second substrate, the voltage strength of the first electrode is recorded as the first voltage, the voltage strength of the second electrode is recorded as the second voltage, and the absolute value of the first voltage is greater than the absolute value of the second voltage.

[0091] It is worth noting that the first substrate is a light-emitting side substrate, which is made of a light-transmitting material and has a negligible effect on light.

[0092] Specifically, the absolute value of the voltage of the first electrode is greater than that of the second electrode, so that the charged particles are arranged more neatly and orderly on the side of the first electrode with higher voltage, that is, there are no gaps between the charged particles close to the light-emitting side, thereby preventing ambient light from entering through the gaps and affecting the picture display.

[0093] In this embodiment, a first substrate is provided; an electrophoretic layer is formed on the first substrate; and a second substrate is encapsulated on the electrophoretic layer; the charged particles are arranged uniformly and neatly on the side of the first electrode where the absolute value of the voltage is higher. This allows the charged particles on the light-emitting side to be arranged uniformly and neatly, avoiding gaps between the charged particles, thereby preventing ambient light from entering through the gaps. This solves the technical problem that when the thickness of each film layer is different, resulting in different electric field strengths required for particle movement in each pixel display unit, some display areas leak light in the dark state or have insufficient brightness in the bright state, resulting in a dull color gamut.

[0094] In some embodiments, step S102 forms an electrophoretic layer on the first substrate, including:

[0095] Step S1021: forming non-light-transmissive barrier wall structures that are spaced apart on the first substrate.

[0096] Step S1022: forming an electrophoresis unit between two adjacent retaining wall structures.

[0097] Specifically, the non-light-transmissive retaining wall structure is grooved to form a groove. A first electrode is formed at the bottom of the groove, and charged particles and electrophoresis liquid are filled, and then a second electrode is formed above the groove. The non-light-transmissive retaining wall structure 35 is located between two adjacent electrophoresis units 34 to prevent the light reflected by the two adjacent electrophoresis units 34 from affecting each other.

[0098] Specifically, an electrophoresis unit is formed between two adjacent retaining wall structures, including:

[0099] A first electrode is prepared on a first substrate; charged particles are filled in a space formed by the first electrode and the retaining wall structures on both sides; and a second electrode is prepared on the retaining wall structures.

[0100] In some embodiments, electrophoretic liquid is further filled between the first electrode and the second electrode so that the charged particles are immersed in the electrophoretic liquid.

[0101] In some embodiments, a packaging layer is disposed in the groove to seal the electrophoretic particles and the electrophoretic liquid.

[0102] In some embodiments, for a display device that displays a color image, step S102 includes:

[0103] Step S1021: preparing a color filter film on the first substrate.

[0104] Step S1022: preparing an electrophoretic layer on the color filter film.

[0105] Figure 6 A schematic structural diagram corresponding to the method for preparing a display device provided in the second embodiment of the present application is shown; wherein Figure 6 (a) A schematic diagram of the structure corresponding to steps S101 and S1021, Figure 6 (b) is a schematic diagram of the structure of preparing a driving circuit layer on a color filter film. Figure 6 (c) Schematic diagram of the structure of the retaining wall structure prepared on the driving circuit layer, Figure 6 (d) Schematic diagram of the structure corresponding to steps S1022 and S103.

[0106] In this embodiment, by providing a first substrate; forming an electrophoretic layer on the first substrate; and encapsulating a second substrate on the electrophoretic layer; the present application makes the first electrode with a higher absolute voltage value close to the light-emitting side, so that the charged particles on the light-emitting side are arranged uniformly and neatly, avoiding gaps between the charged particles, thereby preventing ambient light from entering from the gaps, and solving the technical problem that when there are differences in the thickness of each film layer, resulting in different electric field strengths required for particle movement in each pixel display unit, some display areas leak light in the dark state or the brightness in the bright state is insufficient, resulting in a dull color range. And by preparing an encapsulation layer, the sealing degree of the electrophoretic particles is improved.

[0107] Third embodiment

[0108] Figure 7 A schematic structural diagram of a display device 300 provided in Embodiment 3 of the present application is shown.

[0109] like Figure 7 As shown, the third embodiment of the present application provides a display device 300, including:

[0110] The display device 100 mentioned in the first embodiment or the second embodiment, and the power supply module 200 for supplying power to the display device 100 .

[0111] In this embodiment, compared with the common electrode with lower voltage being close to the light-emitting side in the related art, the present application places the pixel electrode with higher voltage close to the light-emitting side, so that the charged particles 33 are evenly and neatly arranged on one side of the pixel electrode, even if the charged particles 33 on the light-emitting side are evenly and neatly arranged, gaps between the charged particles 33 are avoided, thereby avoiding the entry of ambient light from the gaps, solving the technical problem that when the thickness of each film layer is different, resulting in different electric field strengths required for particle movement in each pixel display unit, some display areas leak light in the dark state or the brightness in the bright state is insufficient, resulting in a dull color gamut. The color gamut vividness of the display device 300 is improved.

[0112] It should be easily understood that “on,” “above,” and “over” in this application should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above something” or “over,” but also may include the meaning of “above something” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0113] The term "substrate substrate" as used herein refers to the material on which subsequent material layers are added. The substrate substrate itself can be patterned. The material added on top of the substrate substrate can be patterned, or can remain unpatterned. In addition, the substrate substrate can include a wide range of materials, such as silicon, germanium, gallium arsenide, indium phosphide, etc. Alternatively, the substrate substrate can be made of a non-conductive material (e.g., glass, plastic, or sapphire wafer, etc.).

[0114] The term "layer" used in the text may refer to a material portion including an area with a certain thickness. A layer may extend over the entire underlying structure or overlying structure, or may have a range smaller than the range of the underlying or overlying structure. In addition, a layer may be an area of ​​a homogeneous or inhomogeneous continuous structure, the thickness of which is less than the thickness of the continuous structure. For example, a layer may be located between the top surface and the bottom surface of the continuous structure or between any paired lateral planes at the top surface and the bottom surface. A layer may extend laterally, vertically and / or along a tapered surface. A substrate substrate may be a layer, may include one or more layers therein, and / or may have one or more layers located thereon, above it and / or below it. A layer may include multiple layers. For example, an interconnect layer may include one or more conductors and a contact layer (forming contacts, interconnects and / or vias therein) and one or more dielectric layers.

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A display device, comprising a first substrate, a second substrate and an electrophoretic layer, wherein the first substrate and the second substrate are arranged opposite to each other, and the first substrate is close to the light-emitting side, and the electrophoretic layer is located between the first substrate and the second substrate, characterized in that: The electrophoretic layer includes a plurality of electrophoretic units and a plurality of non-transparent retaining wall structures, wherein the retaining wall structure is located between any two adjacent electrophoretic units; the electrophoretic unit includes a first electrode, a second electrode and charged particles, wherein the first electrode and the second electrode are arranged opposite to each other, and the charged particles are located between the first electrode and the second electrode, the first electrode is close to the first substrate, and the second electrode is close to the second substrate, the voltage intensity of the first electrode is recorded as a first voltage, and the voltage intensity of the second electrode is recorded as a second voltage, and the absolute value of the first voltage is greater than the absolute value of the second voltage.

2. The display device according to claim 1, characterized in that: The charged particles include first electrophoretic particles and second electrophoretic particles with opposite electrical properties, the first electrophoretic particles are used to reflect light, and the second electrophoretic particles are used to absorb light.

3. The display device according to claim 1, characterized in that: It also includes a color filter film, which is located between the first substrate and the electrophoretic layer, and the color filter film includes a filter portion and a light shielding portion; The orthographic projection of the filter portion on the second substrate is recorded as a first projection, the orthographic projection of the electrophoresis unit on the second substrate is recorded as a second projection, and the first projection covers the second projection.

4. The display device according to claim 3, characterized in that: The display device further includes a driving circuit layer, the driving circuit layer includes a plurality of driving switches, the orthographic projection of the driving switches on the second substrate is recorded as a third projection, the orthographic projection of the shading portion on the second substrate is recorded as a fourth projection, and the fourth projection covers the third projection.

5. The display device according to claim 4, characterized in that: The first electrode includes a first portion, and the first portion is arranged parallel to the color filter film.

6. The display device according to claim 5, characterized in that: The first electrode or the second electrode includes a second portion, the first portion is connected to the second portion, the driving switch includes a gate layer, a source layer and a drain layer, the first portion is electrically connected to the drain layer, and the second electrode is electrically connected to the source layer.

7. The display device according to claim 3, characterized in that: It also includes an inorganic protective layer located between the color filter film and the driving circuit layer.

8. A method for preparing a display device, characterized in that: include: providing a first substrate; forming an electrophoretic layer on the first substrate; encapsulating a second substrate on the electrophoretic layer; Among them, the first substrate is close to the light-emitting side, the electrophoretic layer includes a plurality of electrophoretic units and a plurality of retaining wall structures, the retaining wall structure is located between any two adjacent electrophoretic units so that any two electrophoretic units are not connected, the electrophoretic unit includes a first electrode, a second electrode and charged particles, the first electrode and the second electrode are arranged opposite to each other, the charged particles are located between the first electrode and the second electrode, the first electrode is close to the first substrate, the second electrode is close to the second substrate, the voltage intensity of the first electrode is recorded as the first voltage, the voltage intensity of the second electrode is recorded as the second voltage, and the absolute value of the first voltage is greater than the absolute value of the second voltage.

9. The method for manufacturing a display device according to claim 8, characterized in that: The electrophoretic layer on the first substrate comprises: forming non-light-transmissive retaining wall structures that are spaced apart on the first substrate; An electrophoresis unit is formed between two adjacent retaining wall structures.

10. A display device, characterized in that: include: A display device as claimed in any one of claims 1 to 7, and a power supply module for powering the display device.

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