Color filter substrate and electrophoretic display device

Abstract

This disclosure relates to the field of display technology, and discloses a color filter substrate and an electrophoretic display device. The color filter substrate includes a first substrate, a filter layer, a first electrode, and a light enhancement layer. The filter layer is disposed on one side of the first substrate. The first electrode is disposed on the side of the filter layer opposite to the first substrate. The light enhancement layer is disposed on the side of the first electrode opposite to the first substrate, and a recess is provided on the side of the light enhancement layer opposite to the first substrate. This color filter substrate has high contrast.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and more specifically, to a color filter substrate and an electrophoretic display device including the color filter substrate. Background Technology

[0002] Electrophoresis is the phenomenon where charged particles dispersed in a liquid migrate due to an applied electric field. Electrophoresis is a well-known phenomenon, and electrophoretic (E-Paper) devices have been developed that utilize it. These devices combine the advantages of ordinary paper and electronic displays, offering both readability and portability. They also boast advantages such as low energy consumption, eye protection, good readability in sunlight, and low production costs. Therefore, electrophoretic displays have been recognized as a viable alternative to traditional paper media.

[0003] However, the contrast of current electrophoretic display devices is relatively low.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this disclosure is to overcome the shortcomings of the prior art in terms of low contrast, and to provide a color filter substrate with high contrast and an electrophoretic display device including the color filter substrate.

[0006] According to one aspect of this disclosure, a color filter substrate is provided, comprising:

[0007] First substrate;

[0008] A filter layer is disposed on one side of the first substrate.

[0009] The first electrode is disposed on the side of the filter layer opposite to the first substrate.

[0010] A light enhancement layer is disposed on the side of the first electrode away from the first substrate, and a recess is provided on the side of the light enhancement layer away from the first substrate.

[0011] In one exemplary embodiment of this disclosure, the distance between the sidewall of the recess and the first substrate increases with the increase of the distance from the center of the recess to the first surface, the first surface being parallel to the side of the first substrate near the filter layer.

[0012] In one exemplary embodiment of this disclosure, the sidewall of the recess includes one or both of an arc surface and an inclined surface.

[0013] According to another aspect of this disclosure, an electrophoresis display device is provided, comprising:

[0014] The color filter substrate is any one of the color filter substrates described above;

[0015] An array substrate is disposed on the side of the light enhancement layer of the color filter substrate facing away from the first substrate, and a receiving space is provided between the array substrate and the color filter substrate;

[0016] A sealed barrier structure is disposed between the array substrate and the color filter substrate, and divides the accommodating space into multiple sub-pixel spaces;

[0017] Electrophoretic solution is disposed within the sub-pixel space;

[0018] Reflecting particles are placed within the electrophoretic solution.

[0019] In one exemplary embodiment of this disclosure, the refractive index of the electrophoretic solution is greater than the refractive index of the light enhancement layer.

[0020] In one exemplary embodiment of this disclosure, the array substrate includes:

[0021] Second substrate;

[0022] A driving backplate is disposed on the side of the second substrate close to the color filter substrate, and the driving backplate includes a plurality of switching units;

[0023] The second electrode is connected to the driving back plate and is disposed on the side of the driving back plate away from the second substrate.

[0024] A second dielectric layer, at least covering the second electrode;

[0025] A light-absorbing structure is disposed on the side of the driving backplate away from the second substrate.

[0026] In one exemplary embodiment of this disclosure, the second electrode is configured as a ring, and the light-absorbing structure is disposed within the ring of the second electrode.

[0027] In an exemplary embodiment of this disclosure, a first groove is provided on the driving back plate, the second electrode is located in the first groove, and a second groove opposite to the first groove is provided on the side of the second dielectric layer facing away from the second substrate; the distance between the side of the light-absorbing structure close to the second substrate and the second substrate is greater than the distance between the side of the second electrode facing away from the second substrate and the second substrate.

[0028] In one exemplary embodiment of this disclosure, the light-absorbing structure includes:

[0029] A support portion is provided on the side of the drive back plate that is away from the second substrate.

[0030] A light-absorbing layer is disposed on the side of the support portion away from the second substrate, and the orthogonal projection of the light-absorbing layer on the second substrate covers the orthogonal projection of the support portion on the second substrate and the orthogonal projection of the second electrode on the second substrate.

[0031] In one exemplary embodiment of this disclosure, the particle size of the reflective particles is greater than or equal to 150 nanometers and less than or equal to 400 nanometers.

[0032] The color filter substrate and electrophoretic display device disclosed herein have a light enhancement layer disposed on the side of the first electrode facing away from the first substrate, and a recessed portion disposed on the side of the light enhancement layer facing away from the first substrate. On the one hand, the sidewall of the recessed portion has a large surface area, which allows more reflective particles to participate in reflection within the same area of ​​sub-pixels, increasing the area of ​​the reflective interface and improving the white state reflectivity, thereby improving the contrast ratio. On the other hand, when ambient light shines on the recessed portion, the diffuse reflection of ambient light through the sidewall of the recessed portion and the reflective particles is more uniform, resulting in a better viewing angle for the display device.

[0033] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0034] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0035] Figure 1 This is a schematic diagram illustrating the principle of electrophoretic display technology.

[0036] Figure 2 This is a schematic diagram of an example embodiment of the color filter substrate disclosed herein.

[0037] Figures 3-4 To form Figure 2 A schematic diagram of the structure of each step of the color filter substrate.

[0038] Figures 5-7 The diagram shows the structure of three example implementations of the light enhancement layer.

[0039] Figure 8 This is a schematic diagram of an example embodiment of the electrophoretic display device disclosed herein.

[0040] Figure 9 This is a schematic diagram of the structure and optical path of a sub-pixel in the electrophoretic display device of this disclosure when it is in the white state.

[0041] Figure 10 This is a schematic diagram of the structure and optical path of a sub-pixel of the electrophoretic display device disclosed herein when it is in a dark state.

[0042] Figure 11 for Figure 8 A schematic diagram of an example implementation of the drive backplane.

[0043] Figure 12 for Figure 8 A schematic diagram of another example implementation of the drive backplane.

[0044] Figure 13 This is a top view of the drive backplate.

[0045] Figure 14 In order to be in Figure 12 This is a schematic diagram of the structure after the light-absorbing structure is formed based on the above.

[0046] Figure 15 for Figure 14 A top-down view.

[0047] Figure 16 This is a schematic diagram of the structure of a sub-pixel of the electrophoretic display device of this disclosure in a dark state, according to an example embodiment.

[0048] Figure 17 This is a schematic diagram of the structure after a sealing barrier structure is formed on the color filter substrate.

[0049] Explanation of reference numerals in the attached figures:

[0050] 1. Color filter substrate; 11. First substrate; 12. Filter layer; 121. Black matrix; 122. Filter portion; 13. First electrode; 14. First dielectric layer; 15. Light enhancement layer; 151. Recessed portion; 16. Protective layer;

[0051] 2. Array substrate; 21. Second substrate;

[0052] 22. Driver backplane; 221. Light-shielding layer; 222. Buffer layer; 223. Active layer; 2231. Channel portion; 2232. Conductor portion; 224. Gate insulating layer; 2251. Gate; 2252. Gate line; 226. Interlayer dielectric layer; 2271. Data line; 2272. Source; 2273. Drain; 228. Passivation layer; 229. First groove;

[0053] 23. Second electrode; 24. Second dielectric layer; 241. Second groove; 25. Light-absorbing structure; 251. Support; 252. Light-absorbing layer;

[0054] 3. Electrophoresis solution;

[0055] 4. Reflecting particles; 5. Sealed retaining wall structure;

[0056] 61. Microcapsules; 62. Black microparticles; 63. White microparticles. Detailed Implementation

[0057] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.

[0058] Although relative terms such as "up" and "down" are used in this specification to describe the relative relationship of one component of an icon to another, these terms are used only for convenience, such as according to the orientation of the examples shown in the accompanying drawings. It is understood that if the device of the icon is flipped upside down, the component described as "up" will become the component described as "down." When a structure is "up" of another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" mounted on the other structure, or that the structure is "indirectly" mounted on the other structure through another structure.

[0059] The terms “a,” “one,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” and “third,” etc., are used only as markers and are not a limitation on the number of objects.

[0060] Reference Figure 1As shown, the principle of electrophoretic (E-Paper) display technology is as follows: Microcapsules 61 are added to the electrophoretic solution 3 of the electrophoretic display device. Each microcapsule 61 contains black microparticles 62 and white microparticles 63. The black microparticles 62 are negatively charged, and the white microparticles 63 are positively charged, resulting in an overall electrical equilibrium state for the microcapsule 61. When the driving backplate 22 applies a positive charge to the second electrode 23, the black microparticles 62 move closer to the second electrode 23, while the white microparticles 63 are distributed above the microcapsules 61. Ambient light incident from above is reflected at the white microparticles 63 within the microcapsules 61, resulting in a bright display. When the driving backplate 22 applies a negative charge to the second electrode 23, the white microparticles 63 move closer to the second electrode 23, while the black microparticles 62 are distributed above the microcapsules 61. Ambient light incident from above is absorbed at the black microparticles 62 within the microcapsules 61, resulting in a dark display.

[0061] This disclosure provides a color filter substrate 1 according to an exemplary embodiment, with reference to... Figures 2-7 As shown, the color filter substrate 1 may include a first substrate 11, a filter layer 12, a first electrode 13, and a light enhancement layer 15; the filter layer 12 is disposed on one side of the first substrate 11; the first electrode 13 is disposed on the side of the filter layer 12 away from the first substrate 11; the light enhancement layer 15 is disposed on the side of the first electrode 13 away from the first substrate 11, and a recess 151 is provided on the side of the light enhancement layer 15 away from the first substrate 11.

[0062] The color filter substrate 1 and electrophoretic display device disclosed herein have the following advantages: on the one hand, the sidewall of the recessed portion 151 has a large surface area, which allows more reflective particles 4 to participate in reflection within the same area of ​​sub-pixels, increasing the area of ​​the reflective interface and improving the white state reflectivity, thereby improving the contrast ratio; on the other hand, when ambient light shines on the recessed portion 151, the diffuse reflection of ambient light through the sidewall of the recessed portion 151 and the reflective particles 4 is more uniform, resulting in a better viewing angle for the display device.

[0063] In this exemplary embodiment, the material of the first substrate 11 may include inorganic materials, such as glass, quartz, or metal. The material of the first substrate 11 may also include organic materials, such as resins like polyimide, polycarbonate, polyacrylate, polyetherimide, polyethersulfone, polyethylene terephthalate, and polyethylene naphthalate. The first substrate 11 may be formed from multiple material layers; for example, it may include multiple substrate layers, the material of which can be any of the aforementioned materials. Alternatively, the first substrate 11 may be a single layer, and can be any of the aforementioned materials.

[0064] In this example implementation, refer to Figures 2-4As shown, a filter layer 12 is disposed on one side of the first substrate 11. The filter layer 12 may include a black matrix 121 and filter portions 122. The black matrix 121 may be configured as a grid, with one filter portion 122 disposed within each grid. Alternatively, multiple vias may be disposed on the black matrix 121, with one filter portion 122 disposed within each via. The filter portions 122 can filter incident and outgoing light, ensuring color uniformity and preventing color mixing. The filter portions 122 may include red, green, blue, and white filter portions; however, in some other example embodiments, the white filter portion may be omitted. A protective layer 16 may also be disposed on the side of the filter layer 12 facing away from the first substrate 11. The protective layer 16 may be made of OC, an organic resin adhesive, which, when coated on the RGB filter portion, primarily serves to ensure the surface flatness of the filter layer 12.

[0065] In this example implementation, refer to Figure 2 and Figure 4 As shown, a first electrode 13 is disposed on the side of the filter layer 12 facing away from the first substrate 11. Specifically, the first electrode 13 is disposed on the side of the protective layer 16 facing away from the first substrate 11. The thickness of the first electrode 13 is approximately 350 angstroms. The material of the first electrode 13 can be a transparent conductive material, such as ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), etc. ITO can be subjected to an annealing crystallization process. Natural light can enter and exit through the first electrode 13. The first electrode 13 is disposed as a single layer.

[0066] In some exemplary embodiments of this disclosure, reference is made to Figure 8 As shown, a first dielectric layer 14 can be provided on the side of the first electrode 13 away from the first substrate 11. The material of the first dielectric layer 14 can be an insulating material, such as silicon oxide, silicon nitride, silicon oxynitride, etc. The first dielectric layer 14 covers the first electrode 13, and the first electrode 13 can be insulated and isolated from other external structures through the first dielectric layer 14.

[0067] In this example implementation, refer to Figure 2As shown, a light enhancement layer 15 is provided on the side of the first electrode 13 facing away from the first substrate 11, and a recess 151 is provided on the side of the light enhancement layer 15 facing away from the first substrate 11. Specifically, the distance between the sidewall of the recess 151 and the first substrate 11 increases with the distance from the center of the recess 151 to the first surface, and the first surface is parallel to the side of the first substrate 11 near the filter layer 12; that is, the recess 151 is configured with a structure where the area is smaller the closer it is to the cross-section of the first substrate 11, and the cross-section is parallel to the side of the first substrate 11 near the filter layer 12. The light enhancement layer 15 can be fabricated to form the recess 151 using a nano-pressing process.

[0068] The sidewall of the recess 151 may include one or both of an arc surface and an inclined surface; that is, the sidewall of the recess 151 may include an arc surface, the sidewall of the recess 151 may also include an inclined surface, or the sidewall of the recess 151 may include both an arc surface and an inclined surface. Specifically, refer to... Figures 5-7 As shown, the recessed portion 151 can be configured as a spherical cap structure or an ellipsoidal cap structure; the recessed portion 151 can also be configured as a conical structure or a pyramidal structure. Of course, in some other exemplary embodiments of this disclosure, the recessed portion 151 can also be configured as a half-spherical cap structure or an ellipsoidal cap structure, and the other half as a conical structure or a pyramidal structure.

[0069] Reference Figure 9 As shown, the recessed portion 151 has a large surface area, allowing more reflective particles 4 to participate in reflection within the same area of ​​sub-pixels. This increases the area of ​​the reflective interface, improves white-state reflectivity, and thus enhances contrast. When ambient light shines on the light enhancement layer 15, because the surface of the light enhancement layer 15 is designed with an uneven structure, the diffuse reflection of ambient light through the sidewalls of the recessed portion 151 and the reflective particles 4 is more uniform, resulting in a better viewing angle for the display device.

[0070] The light enhancement layer 15 can be made of an insulating material. Therefore, in this example embodiment, the first dielectric layer 14 may not be provided. The light enhancement layer 15 can insulate and isolate the first electrode 13 from other external structures, thus serving the function of the first dielectric layer 14.

[0071] It should be noted that the recessed portion 151 and the protrusion are opposite to each other. If the recessed portion 151 is provided on the side of the light enhancement layer 15 that is away from the first substrate 11, then the protrusion must be provided on the side of the light enhancement layer 15 that is away from the first substrate 11.

[0072] Based on the same inventive concept, this disclosure provides an electrophoresis display device, with reference to... Figures 8-16As shown, the electrophoretic display device may include a color filter substrate 1, an array substrate 2, a sealing barrier structure 5, an electrophoretic liquid 3, and reflective particles 4; the color filter substrate 1 is any of the above-mentioned color filter substrates 1; the array substrate 2 is disposed on the side of the light enhancement layer 15 of the color filter substrate 1 facing away from the first substrate 11, and an accommodating space is provided between the array substrate 2 and the color filter substrate 1; the sealing barrier structure 5 is disposed between the array substrate 2 and the color filter substrate 1, and divides the accommodating space into multiple sub-pixel spaces; the electrophoretic liquid 3 is disposed in the sub-pixel spaces; and the reflective particles 4 are disposed in the electrophoretic liquid 3.

[0073] In this example embodiment, reflective particles 4 are provided in the electrophoresis solution 3. These reflective particles 4 can be white microparticles or other particles with reflective properties. The reflective particles 4 can be positively or negatively charged, and their driving method is the same; only the polarities of the second electrode 23 and the first electrode 13 are set as needed. The particle size of the reflective particles 4 plays a crucial role in the reflective performance. The formula for calculating the optimal particle size is as follows:

[0074] And λ = d / k,

[0075] In the formula, λ is the wavelength of light; m is the scattering rate, m = refractive index of reflective particle 4 / refractive index of electrophoretic solution 3; n is the refractive index of electrophoretic solution 3; d is the particle size of reflective particle 4; and k is a constant.

[0076] The particle size of the reflective particle 4 can be calculated from the above formula. For any specific wavelength of reflected light, the optimal particle size of the reflective particle 4 can be half of that specific wavelength. The particle size of the reflective particle 4 is preferably selected as nanoparticles in the range of 150-400 nm.

[0077] The wavelength of visible light is greater than or equal to 390 nanometers and less than or equal to 780 nanometers. Considering factors such as error, the particle size of the reflective particle 4 is greater than or equal to 150 nanometers and less than or equal to 400 nanometers. For example, the particle size of the reflective particle 4 can be 156 nanometers, 173 nanometers, 12 nanometers, 203 nanometers, 215 nanometers, 224 nanometers, 237 nanometers, 246 nanometers, 253 nanometers, 262 nanometers, 273 nanometers, 281 nanometers, 295 nanometers, 300 nanometers, 308 nanometers, 315 nanometers, 328 nanometers, 336 nanometers, 349 nanometers, 350 nanometers, 368 nanometers, 375 nanometers, 378 nanometers, 386 nanometers, 394 nanometers, etc.

[0078] The size of a particle is called its "particle size," also known as "grain diameter." The size of spherical particles is expressed as their diameter. For non-spherical particles, there are generally three methods to define their particle size: projected diameter, geometric equivalent diameter, and physical equivalent diameter. Projected diameter refers to the particle size observed under a microscope. Geometric equivalent diameter is the diameter of a spherical particle when it is equal to a certain geometric quantity of the particle. Physical equivalent diameter is the diameter of a spherical particle when it is equal to a certain physical quantity of the particle.

[0079] Furthermore, according to the scattering ability (scattering rate) formula in coating theory, the greater the difference in refractive index, the stronger the scattering ability and the better the white state effect; the scattering ability (scattering rate) formula is:

[0080] In the formula, n is the refractive index of electrophoretic solution 3, n a Let be the refractive index of the reflecting particle 4, and m be the scattering ability. Therefore, the reflecting particle 4 should ideally be a particle with a high refractive index, such as titanium dioxide, which has a refractive index of 2.8, resulting in good scattering and a better white state effect.

[0081] Furthermore, the refractive index of the electrophoretic solution 3 is greater than that of the light-enhancing layer 15, meaning that the electrophoretic solution 3 is an optically denser medium relative to the light-enhancing layer 15. When light travels from the electrophoretic solution 3 to the light-enhancing layer 15, it enters from an optically denser medium into an optically less dense medium. When the incident angle is greater than the critical angle, total internal reflection will occur at the interface. Therefore, referring to... Figure 10 As shown, in the dark state, even if a small amount of light is reflected by the light-absorbing structure 25 or scattered by the not-fully-hidden reflective particles 4, this residual light will undergo total internal reflection at the interface between the electrophoretic liquid 3 and the light-enhancing layer 15, returning to the sub-pixel and being absorbed a second time by the light-absorbing structure 25. Moreover, the recess 151 on the side of the light-enhancing layer 15 facing away from the first substrate 11 will further increase the incident angle of the incident light, increasing the amount of light undergoing total internal reflection and minimizing the emission of light in the dark state.

[0082] Specifically, for example, the light-enhancing layer 15 can be made of vinyl ether materials with a refractive index of 1.3 or less. The electrophoretic solution 3 can be made of tetrachloroethylene, etc., with a refractive index of 1.5 or greater. Of course, the light-enhancing layer 15 can also be made of acrylic, thiol / olefin, or other materials with relatively low refractive indices. The electrophoretic solution 3 can be made of other high-refractive-index fluorine organic solvents.

[0083] In this example implementation, refer to Figure 11As shown, the array substrate 2 may include a second substrate 21. The material of the second substrate 21 may include inorganic materials, such as glass, quartz, or metal. The material of the second substrate 21 may also include organic materials, such as resins like polyimide, polycarbonate, polyacrylate, polyetherimide, polyethersulfone, polyethylene terephthalate, and polyethylene naphthalate. The second substrate 21 may be formed from multiple layers of material; for example, the second substrate 21 may include multiple base layers, and the material of the base layers may be any of the materials mentioned above. Of course, the second substrate 21 may also be a single layer, and may be any of the materials mentioned above.

[0084] A light-shielding layer 221 may also be disposed on one side of the second substrate 21. Light incident from the second substrate 21 into the active layer 223 will generate photogenerated carriers in the active layer 223, which will have a significant impact on the characteristics of the thin-film transistor and ultimately affect the display quality of the display device. The light-shielding layer 221 can block the light incident from the second substrate 21, thereby avoiding the impact on the characteristics of the thin-film transistor and the display quality of the display device. In addition, depending on the type of thin-film transistor, the light-shielding layer 221 may be omitted.

[0085] A buffer layer 222 can also be formed on the side of the light-shielding layer 221 facing away from the second substrate 21. The buffer layer 222 serves to block water vapor and impurity ions in the second substrate 21 (especially organic materials), and also serves to increase hydrogen ions for the subsequently formed active layer 223. The buffer layer 222 is made of an insulating material, which can insulate the light-shielding layer 221 from the active layer 223. In addition, depending on the type of thin-film transistor, the buffer layer 222 can be omitted; other isolation layers can also be provided.

[0086] An active layer 223 is disposed on the side of the buffer layer 222 facing away from the second substrate 21. The active layer 223 can be made of polysilicon, metal oxide, amorphous silicon, etc. Different materials of the active layer 223 result in different types of thin-film transistors. The active layer 223 may include a channel portion 2231 and conductor portions 2232 disposed at both ends of the channel portion 2231. One of the two conductor portions 2232 is a source connection portion, and the other is a drain connection portion. A gate insulating layer 224 is disposed on the side of the active layer 223 facing away from the second substrate 21.

[0087] A gate 2251 and a gate line 2251 are provided on one side of the gate insulating layer 224. The gate 2251 is connected to the gate line 2251, or a portion of the gate line 2251 can serve as the gate 2251. Of course, in some other exemplary embodiments of this disclosure, two gates 2251 may be provided, with an insulating layer between the two gates 2251.

[0088] An interlayer dielectric layer 226 is disposed on the side of the gate 2251 facing away from the second substrate 21. A first via is disposed on the interlayer dielectric layer 226, and the first via connects to the conductor portion 2232. A data line 2271, a source 2272, and a drain 2273 are disposed on the side of the interlayer dielectric layer 226 facing away from the second substrate 21. The data line 2271 can be connected to the drain 2273 as a single unit. The source 2272 and the drain 2273 are respectively connected to the two conductor portions 2232 through two first vias. A passivation layer 228 is disposed on the side of the source 2272 and the drain 2273 facing away from the second substrate 21. A second via is disposed on the passivation layer 228, and the second via connects to the source 2272. The active layer 223, the gate 2251, the source 2272, and the drain 2273 form a thin-film transistor.

[0089] It should be noted that the thin-film transistor described in this specification is a top-gate thin-film transistor. In other exemplary embodiments of this disclosure, the thin-film transistor may also be a bottom-gate or dual-gate type, and its specific structure will not be described in detail here. Moreover, in cases where thin-film transistors with opposite polarities are used or where the current direction changes during circuit operation, the functions of "source 2272" and "drain 2273" are sometimes interchanged. Therefore, in this specification, "source 2272" and "drain 2273" can be interchanged.

[0090] In this example implementation, refer to Figure 12 As shown, a second electrode 23 is provided on the side of the drive backplate 22 that faces away from the second substrate 21; specifically, referring to... Figure 11 As shown, a second electrode 23 is provided on the side of the passivation layer 228 away from the second substrate 21, and the second electrode 23 is connected to the source electrode 2272 of the drive back plate 22 through a second via.

[0091] The second electrode 23 and the first electrode 13 generate a vertical electric field, driving the charged reflective particles 4 to move. Without the first electrode 13, it would be difficult to drive the reflective particles 4 to move up and down using the horizontal electric field of the array substrate 2.

[0092] Reference Figure 13As shown, the second electrode 23 can be configured as a ring, specifically, it can be a rectangular ring; of course, it can also be a circular ring, an elliptical ring, etc.; it can also be a semi-enclosed shape, a semi-enclosed shape, etc. Each sub-pixel has one second electrode 23, positioned in the peripheral area of ​​the sub-pixel, avoiding its placement in the central area. This configuration prevents reflective particles 4 from concentrating in the central area of ​​the sub-pixel, minimizing light rays reaching the reflective particles 4 when the sub-pixel is in a dark state, thus reducing light leakage in dark conditions and improving contrast.

[0093] The second electrode 23 can be made of a transparent conductive material, such as ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), etc. These materials are non-reflective, so even if a small amount of light shines on the second electrode 23 when the pixel is in a dark state, the second electrode 23 will not reflect this light, reducing light leakage in dark states and improving contrast.

[0094] In this example implementation, refer to Figure 11 and Figure 12 As shown, a second dielectric layer 24 is disposed on the side of the second electrode 23 facing away from the second substrate 21. The second dielectric layer 24 at least covers the second electrode 23. For example, the second dielectric layer 24 may only cover the second electrode 23, or it may cover the entire drive backplate 22. The material of the second dielectric layer 24 may be an insulating material, such as silicon oxide, silicon nitride, silicon oxynitride, etc. The second dielectric layer 24 covers the second electrode 23, and the second electrode 23 can be insulated and isolated from other external structures through the second dielectric layer 24.

[0095] In this example embodiment, a light-absorbing structure 25 is provided on the side of the driving backplate 22 that faces away from the second substrate 21. (Refer to...) Figure 14 As shown, the light-absorbing structure 25 can be disposed on the side of the second dielectric layer 24 facing away from the second substrate 21. Of course, referring to... Figure 9 and Figure 10 As shown, the light-absorbing structure 25 can also be disposed between the second dielectric layer 24 and the driving backplate 22.

[0096] Reference Figure 15 As shown, the light-absorbing structure 25 can be disposed within the ring formed by the second electrode 23. Moreover, in order to provide a light-absorbing structure 25 with a large area, the edge line of the orthogonal projection of the light-absorbing structure 25 on the second substrate 21 coincides with the edge line of the orthogonal projection of the second electrode 23 on the second substrate 21.

[0097] In addition, the light-absorbing structure 25 can be made of insulating material. Therefore, in some example embodiments of this disclosure, the second dielectric layer 24 may not be provided. The second electrode 23 can be completely covered by the light-absorbing structure 25. The light-absorbing structure 25 can insulate and isolate the second electrode 23 from other external structures, thus serving the function of the second dielectric layer 24.

[0098] Reference Figure 9 and Figure 10 As shown, a first groove 229 can be provided on the driving back plate 22, and the second electrode 23 is located in the first groove 229. The side of the second dielectric layer 24 facing away from the second substrate 21 is provided with a second groove 241 opposite to the first groove 229. This allows the reflective particles 4 that are attracted by the second electrode 23 to be gathered in the second groove 241, hiding the reflective particles 4 as much as possible. This prevents the light incident on the electrophoretic liquid 3 from being reflected out by the reflective particles 4, but instead absorbs it by the light-absorbing layer 252, reducing dark-state light leakage and improving contrast.

[0099] Furthermore, the distance H1 between the side of the light-absorbing structure 25 closest to the second substrate 21 and the second substrate 21 is greater than the distance H2 between the side of the second electrode 23 facing away from the second substrate 21 and the second substrate 21. This arrangement minimizes the visibility of the reflective particles 4 that converge due to the attraction of the second electrode 23. Only a small portion of perpendicularly incident light can reach the reflective particles 4, while light with a large tilt angle cannot reach them. Moreover, even if some light reaches the reflective particles 4, after reflection by the reflective particles 4, some of the reflected light will still reach the light-absorbing structure 25 and be absorbed by it. This ensures that the light incident into the electrophoretic liquid 3 is not reflected out by the reflective particles 4, but is absorbed by the light-absorbing layer 252, reducing light leakage in dark states and improving contrast.

[0100] Reference Figure 16 As shown, the light-absorbing structure 25 may include a support portion 251 and a light-absorbing layer 252. The support portion 251 may be disposed on the side of the driving back plate 22 away from the second substrate 21. The light-absorbing layer 252 is disposed on the side of the support portion 251 away from the second substrate 21. The support portion 251 serves to support the light-absorbing layer 252. Moreover, the orthogonal projection of the light-absorbing layer 252 on the second substrate 21 covers the orthogonal projection of the support portion 251 on the second substrate 21. That is, the orthogonal projection area of ​​the light-absorbing layer 252 on the second substrate 21 is larger than the orthogonal projection area of ​​the support portion 251 on the second substrate 21, so that an annular gap is formed between the light-absorbing layer 252 and the second dielectric layer 24, and the reflective particles 4 can be accommodated in the gap.

[0101] Furthermore, the orthogonal projection of the light-absorbing layer 252 onto the second substrate 21 also covers the orthogonal projection of the second electrode 23 onto the second substrate 21, meaning the orthogonal projection area of ​​the light-absorbing layer 252 onto the second substrate 21 is larger than the orthogonal projection area of ​​the second electrode 23 onto the second substrate 21. This allows the reflective particles 4, which converge due to the attractive force of the second electrode 23, to be blocked by the light-absorbing layer 252. The light-absorbing layer 252 not only absorbs the incident light but also blocks the reflective particles 4, ensuring that the light incident into the electrophoretic solution 3 is not reflected out by the reflective particles 4 but is absorbed by the light-absorbing layer 252, further reducing dark-state light leakage and improving contrast.

[0102] By replacing the black particles with the light-absorbing structure 25, the negatively charged black microparticles 62 and the positively charged white microparticles 63 are prevented from mixing in the electrophoretic solution 3, thus preventing discharge after the black microparticles 62 and white microparticles 63 come into contact. In other words, the negatively charged black particles and the positively charged white particles are prevented from agglomerating or canceling each other out under the action of electric force. This results in both the black microparticles 62 and the white microparticles 63 forming uncharged particles that cannot move under the action of an electric field and cannot achieve the display function. Therefore, the single-particle electrophoretic solution has better stability.

[0103] In this example embodiment, a sealing barrier structure 5 is further provided between the array substrate 2 and the color filter substrate 1, as shown in the figure. Figure 17 As shown, the sealing barrier structure 5 can be fabricated on the side of the light enhancement layer 15 of the color filter substrate 1 that faces away from the first substrate 11. Furthermore, the area of ​​the light enhancement layer 15 where the sealing barrier structure 5 needs to be set is made planar, providing a relatively flat base surface for the sealing barrier structure 5 and avoiding inconsistent heights of the formed sealing barrier structure 5, thus achieving the effect of sealing and isolating the sub-pixels. Then, electrophoretic solution 3 is dropped into the sub-pixel space formed by the sealing barrier structure 5. (Refer to...) Figures 8-10 as well as Figure 16 As shown, a color filter substrate 1 with a sealed barrier structure 5 and an array substrate 2 are assembled to form an electrophoretic display device.

[0104] The sealing barrier structure 5 can be configured as a grid, dividing the accommodating space between the array substrate 2 and the color filter substrate 1 into multiple sub-pixel spaces. Adjacent sub-pixel spaces are not interconnected and are sealed. One sub-pixel space is positioned opposite to one filter unit, and one sub-pixel space and one filter unit form one sub-pixel. The orthographic projection of the sealing barrier structure 5 on the second substrate 21 is located within the orthographic projection of the black matrix 121 on the second substrate 21. For example, the orthographic projection of the sealing barrier structure 5 on the second substrate 21 coincides with the orthographic projection of the black matrix 121 on the second substrate 21, or the orthographic projection of the black matrix 121 on the second substrate 21 covers and is larger than the orthographic projection of the sealing barrier structure 5 on the second substrate 21; thus, the black matrix 121 can block the sealing barrier structure 5.

[0105] This setup eliminates the need for microcapsules 61, reducing the technological complexity and cost of the electrophoretic display device; moreover, it improves production efficiency.

[0106] Moreover, the material of the sealed barrier structure 5 can be a light-absorbing material, so that in the dark, the sealed barrier structure 5 can absorb part of the light reflected by the light-absorbing layer 252, reducing light leakage in the dark and improving contrast.

[0107] Furthermore, the specific type of electrophoretic display device is not particularly limited, and any type of display device commonly used in the field is acceptable, such as mobile devices like mobile phones, wearable devices like watches, etc. Electrophoretic display devices have low energy consumption and can be used for electronic tags, e-book reading, and due to their eye-protection characteristics, they can also be used for online education, student monitors, etc.

[0108] Those skilled in the art can make appropriate selections based on the specific purpose of the display device, which will not be elaborated further here.

[0109] It should be noted that, in addition to the display panel, the display device also includes other necessary components and parts. Taking the monitor as an example, these include, for instance, the casing, circuit board, power cord, etc. Those skilled in the art can supplement these components according to the specific usage requirements of the display device, and will not be elaborated here.

[0110] Compared with the prior art, the beneficial effects of the display device provided by the example embodiments of the present invention are the same as the beneficial effects of the display panel provided by the example embodiments described above, and will not be repeated here.

[0111] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. An electrophoretic display device, characterized in that, include: A color filter substrate, the color filter substrate comprising a first substrate, a filter layer, a first electrode, and a light enhancement layer; the filter layer is disposed on one side of the first substrate; The first electrode is disposed on the side of the filter layer away from the first substrate; the light enhancement layer is disposed on the side of the first electrode away from the first substrate, and a recess is provided on the side of the light enhancement layer away from the first substrate. An array substrate is disposed on the side of the light enhancement layer of the color filter substrate facing away from the first substrate, and a receiving space is provided between the array substrate and the color filter substrate; A sealed barrier structure is disposed between the array substrate and the color filter substrate, and divides the accommodating space into multiple sub-pixel spaces; Electrophoretic solution is disposed within the sub-pixel space; Reflective particles are disposed within the electrophoretic solution; The array substrate includes: Second substrate; A driving backplate is disposed on the side of the second substrate close to the color filter substrate, and the driving backplate includes a plurality of switching units; The second electrode is connected to the driving back plate and is disposed on the side of the driving back plate away from the second substrate. A second dielectric layer, at least covering the second electrode; A light-absorbing structure is disposed on the side of the driving backplate away from the second substrate; the second electrode is configured as a ring, and the light-absorbing structure is disposed within the ring of the second electrode.

2. The electrophoretic display device according to claim 1, characterized in that, The refractive index of the electrophoretic solution is greater than that of the light enhancement layer.

3. The electrophoretic display device according to claim 1, characterized in that, The driving backplate is provided with a first groove, the second electrode is located in the first groove, and the side of the second dielectric layer facing away from the second substrate is provided with a second groove opposite to the first groove; the distance between the side of the light-absorbing structure close to the second substrate and the second substrate is greater than the distance between the side of the second electrode facing away from the second substrate and the second substrate.

4. The electrophoretic display device according to claim 1, characterized in that, The light-absorbing structure includes: A support portion is provided on the side of the drive back plate that is away from the second substrate. A light-absorbing layer is disposed on the side of the support portion away from the second substrate, and the orthogonal projection of the light-absorbing layer on the second substrate covers the orthogonal projection of the support portion on the second substrate and the orthogonal projection of the second electrode on the second substrate.

5. The electrophoretic display device according to claim 1, characterized in that, The distance between the sidewall of the recess and the first substrate increases with the increase of the distance from the center of the recess to the first surface, which is parallel to the side of the first substrate near the filter layer.

6. The electrophoretic display device according to claim 5, characterized in that, The sidewall of the recess includes one or both of the following: an arc surface and a slope surface.

7. The electrophoretic display device according to claim 1, characterized in that, The particle size of the reflective particles is greater than or equal to 150 nanometers and less than or equal to 400 nanometers.

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