Display device, manufacturing method, and display apparatus

Abstract

The application relates to a display device, a preparation method and a display equipment, the display device comprising a first substrate, a second substrate and an electrophoretic layer, the first substrate being close to a light-emitting side, the electrophoretic layer comprising a plurality of electrophoretic units and a plurality of non-light-transmitting barrier wall structures, the barrier wall structures being located between any two adjacent electrophoretic units, so that any two electrophoretic units are not connected; the electrophoretic unit comprising a first electrode, a second electrode and charged particles, the first electrode and the second electrode being oppositely arranged, the charged particles being located between the first electrode and the second electrode, the first electrode being close to the first substrate, the second electrode being close to the second substrate, the voltage intensity of the first electrode being recorded as a first voltage, the voltage intensity of the second electrode being recorded as a second voltage, and the absolute value of the first voltage being greater than the absolute value of the second voltage. Technical problems of dark-state light leakage or insufficient brightness in a bright state in a part of a display area when the electric field intensity required for particle movement in each pixel display unit is different are solved.

Description

TECHNICAL FIELD

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

[0002] In recent years, electronic paper display devices are widely used in conference nameplates, supermarket labels, public transportation billboards, and electronic reader display fields because they are thin, flexible, and erasable, meeting the needs of users.

[0003] In related technologies, 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 state display.

[0004] However, in related technologies, due to process differences and differences in the thickness of each film layer, the distance between the common electrode and the pixel electrode in each pixel display unit is not the same, that is, the electric field strength required for the movement of particles in each pixel display unit is different, and the voltage of the pixel electrode is higher than that of the common electrode. Therefore, when the same voltage is applied to each pixel display unit, the charged particles in the pixel display unit with a longer distance between the pixel electrode and the common electrode will be arranged in disorder. The particle accumulation density near the light-emitting side is insufficient, and there are gaps between the particles arranged in disorder. Ambient light enters from the gaps, resulting in dark state light leakage or insufficient brightness in the bright state, which causes the color gamut to be not bright. SUMMARY

[0005] The present application aims to provide a display device, a preparation method and a display equipment to solve the technical problem of dark state light leakage or insufficient brightness in the bright state in part of the display area of the electronic paper display device in related technologies, which causes the color gamut to be not bright.

[0006] In a first aspect, an embodiment of the present application provides a display device, comprising a first substrate, a second substrate, and an electrophoretic layer, the first substrate and the second substrate are oppositely arranged, and the first substrate is closer to the light-emitting side, and the electrophoretic layer is located between the first substrate and the second substrate.

[0007] The electrophoretic layer comprises a plurality of electrophoretic units and a plurality of non-light-transmitting barrier structures, the barrier structures are located between any two adjacent electrophoretic units to make any two electrophoretic units not connected; the electrophoretic 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, 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 comprise first electrophoretic particles and second electrophoretic particles with opposite electric properties, the first electrophoretic particles are used for reflecting light, and the second electrophoretic particles are used for absorbing light.

[0009] In a possible implementation, the display device further comprises a color filter film located between the first substrate and the electrophoretic layer, and the color filter film comprises a light filtering part and a light shielding part.

[0010] The color filter film comprises a light filtering part and a light shielding part, the orthographic projection of the light filtering part on the second substrate is recorded as a first projection, the orthographic projection of the electrophoretic unit on the second substrate is recorded as a second projection, and the first projection covers the second projection.

[0011] In a possible implementation, the display device further comprises a driving circuit layer comprising a plurality of driving switches, the orthographic projection of the driving switch on the second substrate is recorded as a third projection, the orthographic projection of the light shielding part on the second substrate is recorded as a fourth projection, and the fourth projection covers the third projection.

[0012] In a possible implementation, the first electrode comprises a first part, and the first part is arranged in parallel with the color filter film.

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

[0014] In a possible implementation, the display device further comprises an inorganic protective layer located between the color filter film and the driving circuit layer.

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

[0016] A first substrate is provided.

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

[0018] A second substrate is encapsulated on the electrophoretic layer.

[0019] The first substrate is close to the light-out side, the electrophoretic layer comprises a plurality of electrophoretic cells and a plurality of barrier wall structures, the barrier wall structures are located between any two adjacent electrophoretic cells to make any two electrophoretic cells not connected, the electrophoretic cell 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, 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 is formed on the first substrate, and comprises:

[0021] The non-light-transmitting barrier wall structures are formed on the first substrate in a spaced distribution;

[0022] The electrophoretic cells are formed between the adjacent two barrier wall structures.

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

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

[0025] The display device, the preparation method and the display device provided by the embodiments of the present application, the display device comprises a first substrate, a second substrate and an electrophoretic layer, the first substrate and the second substrate are oppositely arranged, and the first substrate is close to the light-out side, the electrophoretic layer is located between the first substrate and the second substrate, the electrophoretic layer comprises a plurality of electrophoretic cells and a plurality of non-light-transmitting barrier wall structures, the barrier wall structures are located between any two adjacent electrophoretic cells to make any two electrophoretic cells not connected, the electrophoretic cell 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, 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. Compared with the related art in which a plurality of electrophoretic cells share a common electrode, that is, the voltage on the side of the common electrode of the plurality of electrophoretic cells is the same, the present application sets an independent first electrode and a second electrode in each electrophoretic cell to control the display of the electrophoretic cell individually, and the absolute value of the first voltage is greater than the absolute value of the second voltage. The first electrode with stronger voltage is close to the light-out side, so that the charged particles are uniformly and orderly arranged on the side of the first electrode, that is, the charged particles are uniformly and orderly arranged close to the light-out side, so as to avoid the gaps between the charged particles, thereby avoiding the ambient light from entering from the gaps, and solving the technical problem that when there is a difference in the thickness of each film layer, the electric field intensity required for the particle movement in each pixel display unit is different, part of the display area leaks light in dark state or the brightness is insufficient in bright state, resulting in that the color gamut is not bright. Attached Figure Description

[0026] The features, advantages, and technical effects of exemplary embodiments of the present application will now be described with reference to the accompanying drawings. In the drawings, the same components are referred to by the same reference numerals. The drawings are not drawn to scale and are only used to illustrate relative positions. The layer thicknesses in some areas are exaggerated for ease of understanding; the layer thicknesses in the drawings do not represent actual layer thickness proportions.

[0027] Figure 1 This diagram illustrates the structure of a display device in the related art.

[0028] Figure 2 This diagram illustrates the structure of a display device according to Embodiment 1 of this application.

[0029] Figure 3 This illustration shows a specific structural diagram of a display device provided in Embodiment 1 of this application when the first electrode is a pixel electrode;

[0030] Figure 4 This illustration shows a specific structural diagram of another display device provided in Embodiment 1 of this application when the first electrode is a pixel electrode;

[0031] Figure 5 This diagram illustrates a process flow chart of a method for manufacturing a display device according to Embodiment 2 of this application.

[0032] Figure 6 This diagram shows a structural schematic corresponding to the manufacturing method of the display device provided in Embodiment 2 of this application;

[0033] Figure 7 This is a schematic diagram of the structure of a display device provided in Embodiment 3 of this application.

[0034] Figure label:

[0035] 100. Display device;

[0036] 10. First substrate;

[0037] 20. Driver circuit layer; 21. Driver switch; 211. Gate layer; 212. Source layer; 213. Drain layer; 214. Gate insulating layer; 215. Planarization layer;

[0038] 30. Electrophoretic layer; 31. First electrode; 311. First part; 312. Second part; 32. Second electrode; 33. Charged particle; 331. First electrophoretic particle; 332. Second electrophoretic particle; 34. Electrophoretic unit; 35. Barrier structure;

[0039] 40. 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] Features and exemplary embodiments of various aspects of the present application will be described below in detail. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without some or all of these specific details. The description of the embodiments is merely intended to provide a better understanding of the present application by showing examples of the present application. In the drawings and the following description, well-known structures and techniques are not shown in order to avoid unnecessary obscuring of the present application; and, for clarity, the dimensions of regions can be exaggerated. Furthermore, features, structures or characteristics described below can be combined in any suitable manner in one or more embodiments.

[0045] In the related art, an electronic paper mainly consists of a common electrode, an electronic ink film layer, and a pixel electrode, and the common electrode is closer to the light exit side. A high voltage is provided to the pixel electrode, and a low voltage is provided to the common electrode, to form an electric field from bottom to top, to control the movement of particles with different charges in the electronic ink film layer, to reflect or absorb ambient light, to realize bright state or dark state display.

[0046] However, in the related art, due to process differences, the thicknesses of the film layers are different, resulting in different distances between the common electrode and the pixel electrode in each pixel display unit, i.e., different electric field strengths required for the movement of particles in each pixel display unit, and the voltage of the pixel electrode is higher than that of the common electrode. Therefore, when the same voltage is applied to each pixel display unit, for the pixel display unit with a longer distance between the pixel electrode and the common electrode, the charged particles will be arranged in disorder. The particle accumulation density near the light exit side is insufficient, and there are gaps between the particles arranged in disorder, ambient light enters from the gaps, and this part of the dark state leaks light or the bright state has insufficient brightness, resulting in problems such as unvibrant color gamut.

[0047] In view of this, the embodiment of the present application provides a display device, a preparation method and a display equipment. By arranging the first electrode close to the light-out side, the second electrode close to the backlight side, and the absolute value of the first voltage greater than the absolute value of the second voltage, the charged particles are uniformly and orderly arranged on one side of the first electrode. Even if the charged particles are uniformly and orderly arranged close to the light-out side, the gap between the charged particles is avoided, so that the ambient light is prevented from entering from the gap, and the technical problem of the color gamut not being bright due to the dark-state light leakage or the insufficient brightness in the bright state of part of the display area caused by the different electric field strengths required for the particle movement in each pixel display unit when the thicknesses of the film layers are different is solved.

[0048] The specific structure and process of the display device, the preparation method and the display equipment provided by the embodiments of the present application are described below with reference to the accompanying drawings.

[0049] First embodiment

[0050] Figure 1 A structure diagram of a display device 100 in the related art is shown. Figure 2 A structure diagram of a display device 100 provided by the first embodiment of the present application is shown.

[0051] As shown in Figure 1 , 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-out side than the first electrode 31. Specifically, in Figure 1 , 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 the common electrode side of the multiple display units is the same, about 0-+5V. Since when the voltage of the second electrode 32 is lower than the voltage of the first electrode 31, i.e., 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 disorder, i.e., the charged particles 33 close to the light-out side are arranged in disorder, the charged particles 33 far from the light-out side are arranged in order, and the gap between the charged particles 33 close to the light-out side, the ambient light enters from the gap between the charged particles 33, and the display quality is affected.

[0052] As shown in Figures 2-4 , the first embodiment of the present application provides a display device 100, which includes a first substrate 10, a second substrate 40 and an electrophoretic layer 30. The first substrate 10 and the second substrate 40 are oppositely arranged, and the first substrate 10 is close to the light-out side. 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 cells 34 and a plurality of non-light-transmissive barrier structures 35 between any two adjacent electrophoretic cells 34 to isolate any two electrophoretic cells 34 from each other. The electrophoretic cell 34 includes a first electrode 31, a second electrode 32 and charged particles 33, the first electrode 31 and the second electrode 32 are oppositely arranged, and the charged particles 33 are 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 first electrode 31 has a first voltage, and the second electrode 32 has a second voltage. 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 cells 34 are isolated, that is, the voltage of the electrode in the electrophoretic cell 34 can be controlled independently in the present application. The absolute value of the second voltage is the absolute value of the voltage of the electrode close to the backlight side or the absolute value of the voltage of the electrode close to the light-emitting side in the related art. The barrier structure 35 prevents the light reflected by the two adjacent electrophoretic cells 34 from affecting each other.

[0055] In an embodiment, the first substrate 10 and the second substrate 40 are mainly used for supporting the display device 100. The first substrate 10 and the second substrate 40 can be rigid substrates made of glass or flexible substrates made of insulating materials such as polyether sulfone (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 can also be flexible substrates made of polyimide (PI) and the like. That is, the display device 100 of the present application is not limited to rigid and non-flexible, but can also be flexible and bendable.

[0057] Specifically, in the embodiment, the first substrate 10 is close to the light-out side, and the second substrate 40 is close to the backlight side, that is, the light in the environment first passes through the first substrate 10 and enters, 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 application only limits that the absolute value of the voltage of the first electrode 31 close to the light-out side is 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 application does not limit the electrical properties of the charges carried by the first electrode 31 and the second electrode 32. Even in the pixel display unit with a long distance between the pixel electrode and the common electrode, because the voltage on the side of the first electrode 31 is high, the charged particles 33 are arranged in order on the side of the first electrode 31, that is, the charged particles 33 close to the light-out side are arranged closely, and there is no gap between the charged particles 33, thereby avoiding the ambient light from entering through the gap and affecting the picture display.

[0058] For example, when the first electrode 31 is a pixel electrode and the second electrode 32 is a common electrode, the absolute value of the voltage of the common electrode is conventionally set, and the absolute value of the voltage of the pixel electrode on the light-out side is larger, then the charged particles 33 on the light-out side are arranged closely. When the first electrode 31 is a common electrode and the second electrode 32 is a pixel electrode, the absolute value of the voltage of the common electrode on the light-out side is larger, then the charged particles 33 on the light-out side are arranged closely. Because the various electrophoretic units 34 are arranged at intervals in the application, the voltage of the electrode in the electrophoretic unit 34 can be controlled individually. When the picture is switched, the absolute value of the voltage of the first electrode 31 is still greater than the absolute value of the voltage of the second electrode 32. In the related art, because all the electrophoretic units 34 share a common electrode, and the common electrode is located on the light-out side, when the picture is switched, only by adjusting the voltage of the pixel electrode, the difference between the absolute value of the voltage of the pixel electrode and the absolute value of the voltage of the common electrode can be controlled to realize the movement of the charged particles. In 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-out side are not arranged uniformly, and the ambient light enters from the gap, causing the dark state of the part of the display device to leak light or the bright state to have insufficient brightness, and the color gamut is not bright.

[0059] In the embodiment, the application arranges the first electrode with a larger voltage close to the light-out side, so that the charged particles 33 are uniformly and orderly arranged on the side of the pixel electrode. Even if the charged particles 33 on the light-out side are uniformly and orderly arranged, gaps between the charged particles 33 are avoided, thereby avoiding the ambient light from entering from the gap, and solving the technical problem that when the thicknesses of the film layers are different, the electric field strengths required for the movement of the particles in the pixel display units are different, the dark state of part of the display area leaks light or the bright state has insufficient brightness, and the color gamut is not bright.

[0060] Figure 3 Fig. 1 shows a schematic diagram of a display device according to an embodiment of the present application.

[0061] As shown in Fig. 1, in some embodiments, the charged particles 33 include first electrophoretic particles 331 and second electrophoretic particles 332, the first electrophoretic particles 331 are used to reflect light, and the second electrophoretic particles 332 are used to absorb light. Figure 3

[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 particles 331 are close to the first electrode 31, and the second electrophoretic particles 332 are close to the second electrode 32, i.e., the white electrophoretic particles are close to the pixel electrode on the light-emitting side, and the black electrophoretic particles are close to the common electrode, the light in the environment is incident on the white electrophoretic particles, the white electrophoretic particles reflect the light, the display device 100 displays white light, the white light enters the human eye, and at this time, the display device 100 is in a bright state. Because the voltage of the pixel electrode is higher, the white electrophoretic particles are arranged in order, and there is no gap between the white electrophoretic particles, i.e., all the light in the environment is reflected, thereby 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, i.e., 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 incident on the black electrophoretic particles, the black electrophoretic particles absorb the light, the display device 100 does not emit light, i.e., no light enters the human eye, and at this time, the display device 100 is in a dark state. Because the voltage of the pixel electrode is higher, the black electrophoretic particles are arranged in order, and there is no gap between the black electrophoretic particles, i.e., all the light in the environment is absorbed, thereby 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, the voltage of the first electrode 31 is +3V and the voltage of the second electrode 32 is -1V in the first picture, 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 cell 34 presents a dark state; when the picture is switched, the voltage of the first electrode 31 is -3V and the voltage of the second electrode 32 is +1V in the second picture, 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 cell 34 presents a bright state. As can be seen, in the present application, whether in a bright state or a 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 in order, avoiding the ambient light from entering the gap.

[0066] In the related art, still taking the example that the white electrophoretic particles are positively charged and the black electrophoretic particles are negatively charged, the voltage of the common electrode close to the light-emitting side is still +3V and the voltage of the pixel electrode is +1V in the first picture, 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 greater, and the black electrophoretic particles are arranged uniformly without gaps. However, when the picture is switched, in order to make the second picture present a bright state, that is, the white electrophoretic particles with positive charges are close to the common electrode and the black electrophoretic particles with negative charges are close to the pixel electrode. Since all the electrophoretic cells 34 share a common electrode, the voltage of the common electrode is fixed and remains +3V, and the voltage of the pixel electrode needs to be increased so that the voltage of the pixel electrode is greater than the voltage of the common electrode, for example, the voltage of the pixel electrode is +5V. At this time, since the absolute value of the voltage of the pixel electrode is greater than the absolute value of the voltage of the common electrode, when the distance between the pixel electrode and the common electrode in the electrophoretic cell 34 is large, the black electrophoretic particles close to the backlight side are arranged in order, while the white electrophoretic particles close to the light-emitting side are arranged in disorder, and there are gaps between the two white electrophoretic particles. At this time, external light enters through the gap, causing the electrophoretic cell to have a problem of reduced darkness.

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

[0068] The orthogonal projection of the light filtering part 51 on the second substrate 40 is recorded as a first projection, and the orthogonal projection of the electrophoretic cell 34 on the second substrate 40 is recorded as a second projection, and the first projection covers the second projection.

[0069] The light filtering part 51 includes a red light part, a green light part and a blue light part, so that the light in the environment emits red light, green light and blue light after passing through the red light part, the green light part and the blue light part, and the display device 100 realizes color display.

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

[0071] The electrophoretic unit 34 can further include an electrophoretic liquid, and the first electrophoretic particles 331 and the second electrophoretic particles 332 are soaked in the electrophoretic liquid. The electrophoretic liquid is a transparent and 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 light filtering part 51 is greater than or equal to the orthographic projection of the electrophoretic unit 34. Since there is an included angle between the reflected light of the first electrophoretic particles 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 particles 331 can pass through the light filtering part 51, reducing the case that the light reflected by the first electrophoretic particles 331 irradiates the light shielding part 52, avoiding light waste, and reducing the brightness of the display device 100.

[0073] In some embodiments, the display device 100 further includes a driving circuit layer 20, and the driving circuit layer 20 includes a plurality of driving switches 21. The orthographic projection of the second substrate 40 on the driving circuit layer 20 is referred to as a third projection, and the orthographic projection of the light shielding part 52 on the second substrate 40 is referred to as a fourth projection. The fourth projection covers the third projection.

[0074] The driving circuit layer 20 is connected with the pixel electrode. Specifically, when the pixel electrode is the first electrode 31, the driving circuit layer 20 is located on the light-out 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 that the driving switch 21 shields the electrophoretic unit 34 and affects the ambient light incidence and emission, and ensure the quality of the display picture.

[0076] In some embodiments, the first electrode 31 includes a first part 311, and the first part 311 is disposed in parallel with 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 particles 33 are parallel to the first part 311 of the first electrode 31. For the first electrophoretic particles 331, the case that the charged particles 33 are not parallel to the first part 311 of the first electrode 31 is avoided. Figure 4 Figure 4 ​A specific structure schematic diagram of another display device 100 when the first electrode is a pixel electrode is shown in FIG. 1C. As shown in FIG. 1C, the first electrode 31 is a pixel electrode, and the second electrode 32 is a common electrode. Figure 4 As shown in FIG. 1C, when the first part 311 is not parallel to the color filter film 50, i.e., the first electrophoretic particles 331 are not parallel to the color filter film 50, the reflected part of the light enters the light shielding part 52. Moreover, because the first electrophoretic particles 331 are not parallel to the color filter film 50, the distance between each first electrophoretic particle 331 and the first substrate 10 is not equal. For the first electrophoretic particles 331 close to the first substrate 10, the reflected light has less attenuation in the transmission process; and for the first electrophoretic particles 331 far from the first substrate 10, the reflected light has more attenuation in the transmission process. This causes the light intensity received by the user to be not equal, 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 with 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 with the drain layer 213, and the second electrode 32 is electrically connected with the source layer 212 (not shown in the figure).

[0079] The pixel electrode includes the second part 312. When the pixel electrode is the first electrode 31, the first electrode 31 includes the second part 312; and when the pixel electrode is the second electrode 32, the second electrode 32 includes the second part 312. In the figure, only the case that the pixel electrode is the first electrode 31 is shown, and the structure when the pixel electrode is the second electrode 32 is not shown.

[0080] The material of the gate layer 211 can be Al, Cu, Mo, or the like. The materials of the source layer 212 and the drain layer 213 can be Al, Cu, Mo, or the like. The source layer 212 and the drain layer 213 are provided with a source layer, and the material of the source layer can be polysilicon.

[0081] Specifically, the gate layer 211 and the source layer 212 or the drain layer 213 are provided with a gate insulating layer 214, and the material of the gate insulating layer 214 is silicon nitride SiNx and silicon oxide SiOx. The source layer 212 or the drain layer 213 is provided with a planarization layer 215, and it is worth noting that the planarization layer 215 is provided with a groove, and the second part 312 of the first electrode 31 is electrically connected with the drain layer 213 through the groove.

[0082] In some embodiments, an inorganic protective layer 60 is further included 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 the driving circuit layer 20 is prepared. The inorganic protective layer 60 is usually prepared from transparent silicon nitride SiNx.

[0083] In the embodiment, the pixel electrode with a large voltage is close to the light-out side, and the charged particles 33 are uniformly and orderly arranged on one side of the pixel electrode. Even if the charged particles 33 are uniformly and orderly arranged on the light-out side, gaps between the charged particles 33 are avoided, so that ambient light is prevented from entering the gaps, and the technical problem that when the thicknesses of the film layers are different, the electric field intensity required for particle movement in each pixel display unit is different, part of the display area leaks light in a dark state or the brightness is insufficient in a bright state, and the color gamut is not bright is solved. For the display device 100 capable of presenting a color picture, the area of the light filter part 51 is greater than or equal to the orthographic projection of the electrophoretic unit 34, the light reflected by the first electrophoretic particle 331 is reduced to illuminate the light shielding part 52, the light is avoided to be wasted, and the brightness of the display device 100 is ensured. The driving switch 21 avoids shielding the electrophoretic unit 34, so that the ambient light is prevented from being affected to enter and exit, and the quality of the display picture is ensured. The first part 311 of the first electrode 31 is arranged in parallel with the color filter film 50, which on the one hand avoids part of the light reflected by the first electrophoretic particle 331 from entering the light shielding part 52, and reduces the brightness of the display picture; on the other hand, the light intensity received by the user is avoided to be different, and the user experience is ensured. The 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 flowchart showing a preparation method of a display device provided by the second embodiment of the application is shown.

[0086] As Figure 5 shown, the preparation method of the display device provided by the second embodiment of the application comprises the following steps.

[0087] Step S101: providing a first substrate.

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

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

[0090] The first substrate is close to the light-out side, the electrophoretic layer comprises a plurality of electrophoretic units and a plurality of barrier wall structures, the barrier wall structure is located between any two adjacent electrophoretic units to make any two electrophoretic units not connected, the electrophoretic 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 the absolute value of the second voltage.

[0091] It is worth mentioning that the first substrate is the light-emitting side substrate, which is made of a light-transmitting material and has 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 orderly on the side of the first electrode with higher voltage, i.e., there is no gap between the charged particles close to the light-emitting side, thereby avoiding the ambient light from entering through the gap and affecting the picture display.

[0093] In the embodiment, the first substrate is provided, the electrophoretic layer is formed on the first substrate, the second substrate is encapsulated on the electrophoretic layer, and the charged particles are uniformly and orderly arranged on the side of the first electrode with higher absolute value of voltage, i.e., the charged particles on the light-emitting side are uniformly and orderly arranged, and gaps between the charged particles are avoided, thereby avoiding the ambient light from entering through the gaps and solving the technical problem that when the thicknesses of the film layers are different, the electric field strengths required for the particle movement in the pixel display units are different, part of the display area leaks light in dark state or has insufficient brightness in bright state, and the color gamut is not bright.

[0094] In some embodiments, the step S102 of forming the electrophoretic layer on the first substrate comprises:

[0095] The step S1021 of forming the non-light-transmitting barrier wall structure in the spaced distribution on the first substrate.

[0096] The step S1022 of forming the electrophoretic unit between the adjacent two barrier wall structures.

[0097] Specifically, the non-light-transmitting barrier wall structure is slotted to form a groove. The first electrode is prepared at the bottom of the groove, and the charged particles and the electrophoretic fluid are filled, and then the second electrode is formed above the groove. The non-light-transmitting barrier wall structure 35 is located between the adjacent two electrophoretic units 34 to avoid the mutual influence of the reflected light of the adjacent two electrophoretic units 34.

[0098] Specifically, the step of forming the electrophoretic unit between the adjacent two barrier wall structures comprises:

[0099] The first electrode is prepared on the first substrate, the charged particles are filled in the space formed by the first electrode and the barrier wall structures on both sides, and the second electrode is prepared on the barrier wall structure.

[0100] In some embodiments, the electrophoretic fluid is also filled between the first electrode and the second electrode, so that the charged particles are soaked in the electrophoretic fluid.

[0101] In some embodiments, an encapsulation layer is arranged in the groove to seal the electrophoretic particles and the electrophoretic fluid.

[0102] In some embodiments, for the display device displaying a color picture, the step S102 comprises:

[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 structure diagram corresponding to the preparation method of the display device provided in Embodiment Two of the present application is shown; wherein Figure 6 (a) a structure diagram corresponding to steps S101 and S1021, Figure 6 (b) a structure diagram of preparing a driving circuit layer on the color filter film, Figure 6 (c) a structure diagram of preparing a barrier structure on the driving circuit layer, Figure 6 (d) a structure diagram corresponding to steps S1022 and S103.

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

[0107] Third Embodiment

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

[0109] As Figure 7 shown, Embodiment Three of the present application provides a display device 300, comprising:

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

[0111] In the present embodiment, compared with the low-voltage common electrode close to the light-out side in the related art, the present application makes the pixel electrode with a higher voltage close to the light-out side, so that the charged particles 33 are uniformly and neatly arranged on one side of the pixel electrode, i.e. the charged particles 33 on the light-out side are uniformly and neatly arranged, avoiding gaps between the charged particles 33, thereby avoiding ambient light from entering the gap, solving the technical problem that when there is a difference in thickness of each film layer, the electric field intensity required for particle movement in each pixel display unit is different, causing light leakage in dark state or insufficient brightness in bright state in part of the display area, resulting in unvibrant color gamut. The color gamut vibrancy of the display device 300 is improved.

[0112] It should be readily understood that "on," "over," and "above" in the present application should be interpreted in the broadest manner, such that "on" means not only "directly on" but also includes the implication of "on" with intervening features or layers therebetween, and "over" or "above" includes not only the implication of "over" or "above" but also the implication of "over" or "above" with no intervening features or layers therebetween (i.e., directly on).

[0113] As used herein, the term "substrate" refers to a material on which a subsequent layer of material is added. The substrate itself can be patterned. The material added on top of the substrate can be patterned or can remain unpatterned. Further, the substrate can comprise a wide range of materials, such as silicon, germanium, gallium arsenide, indium phosphide, etc. Alternatively, the substrate can be made of a non-conductive material, such as glass, plastic, or sapphire wafer, etc.

[0114] As used herein, the term "layer" can refer to a portion of material that includes a region having a thickness. A layer can extend over an entire underlying or overlying structure, or can have a scope less than the underlying or overlying structure. Further, a layer can be a region of a continuous structure that is homogeneous or non-homogeneous and has a thickness less than the thickness of the continuous structure. For example, a layer can be between or at any pair of lateral planes between a top surface and a bottom surface of a continuous structure. A layer can extend laterally, vertically, and / or along a tapered surface. A substrate can be a layer, can include one or more layers therein, and / or can have one or more layers thereon, thereabove, and / or therebelow. A layer can include multiple layers. For example, an interconnect layer can include one or more conductor and contact layers (within which contacts, interconnect lines, and / or vias are formed) and one or more dielectric layers.

[0115] Finally, it should be noted that the above-described embodiments are merely intended to illustrate the technical solutions of the present application, but not to limit the same; even though the present application has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above-described embodiments, or equivalently replace some or all of the technical features thereof; and such 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, the first substrate and the second substrate are oppositely arranged, and the first substrate is close to a light-out side, the electrophoretic layer is between the first substrate and the second substrate, characterized in that: the electrophoretic layer comprises a plurality of electrophoretic cells and a plurality of non-light-transmitting barrier structures, the barrier structures are between any two adjacent electrophoretic cells to make any two adjacent electrophoretic cells not connected; the electrophoretic cell comprises a first electrode, a second electrode and charged particles, the first electrode and the second electrode are oppositely arranged, the charged particles are 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, the voltage intensity of the second electrode is recorded as a second voltage, the absolute value of the first voltage is greater than the absolute value of the second voltage, so that the charged particles close to the light-out side are closely arranged, and there is no gap between the charged particles; the first electrode and the second electrode are opposite in electric property, the charged particles comprise first electrophoretic particles and second electrophoretic particles opposite in electric property, the first electrophoretic particles are used for reflecting light, and the second electrophoretic particles are used for absorbing light. Further comprising a color filter film between the first substrate and the electrophoretic layer, the color filter film comprises a light filtering part and a light shielding part; the light filtering part is projected onto the second substrate as a first projection, the electrophoretic cell is projected onto the second substrate as a second projection, and the first projection covers the second projection.

2. The display device according to claim 1, wherein The display device further comprises a driving circuit layer, the driving circuit layer comprises a plurality of driving switches, the driving switches are projected onto the second substrate as a third projection, the light shielding part is projected onto the second substrate as a fourth projection, and the fourth projection covers the third projection. The first electrode comprises a first part, and the first part is arranged in parallel with the color filter film.

3. The display device of claim 2, wherein, The first electrode comprises a second part, the first part is connected with the second part, the driving switch comprises a gate layer, a source layer and a drain layer, and the first part is electrically connected with the drain layer.

4. The display device of claim 3, wherein, Further comprising an inorganic protective layer between the color filter film and the driving circuit layer.

5. The display device of claim 4, wherein, comprising:

6. The display device according to claim 3, wherein providing a first substrate; 7. A method of manufacturing a display device as claimed in any one of claims 1-6, characterized in that forming an electrophoretic layer on the first substrate; encapsulating a second substrate on the electrophoretic layer; ​ ​ The first substrate is close to the light emitting side, the electrophoretic layer comprises a plurality of electrophoretic cells and a plurality of barrier wall structures, the barrier wall structure is located between any two adjacent electrophoretic cells to make any two electrophoretic cells not connected, the electrophoretic cell 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 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.

8. The method of claim 7, wherein the display device is prepared by the steps of: The electrophoretic layer on the first substrate comprises: forming a non-light-transmitting barrier wall structure distributed at intervals on the first substrate; forming an electrophoretic cell between two adjacent barrier wall structures.

9. A display device, characterized by comprise: The display device according to any one of claims 1-6, and a power supply module for supplying power to the display device.

Images