Display panel and manufacturing method thereof, electronic device

Abstract

This invention discloses a display panel and its fabrication method, as well as an electronic device. The display panel includes: a first substrate and a second substrate disposed opposite to each other; a reflective layer located on one side of the first substrate; a color resist layer located on the side of the reflective layer away from the first substrate; a pixel electrode layer located on the side of the color resist layer away from the first substrate, the pixel electrode layer including a plurality of sub-pixel electrodes spaced apart; a common electrode layer located on one side of the second substrate; and pixel isolation pillars located between the first and second substrates, defining a plurality of sub-pixel regions between the first and second substrates. Each sub-pixel region contains black charged microspheres and white charged microspheres. Each sub-pixel region has at least two sub-pixel electrodes, and the projected area of ​​the sub-pixel electrodes within a sub-pixel region on the first substrate is smaller than the projected area of ​​the color resist layer on the first substrate. This improves the display brightness of the display panel in white mode.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more specifically, to display panels and their manufacturing methods, and electronic devices. Background Technology

[0002] Reflective display devices utilize natural light for display, providing clear visibility in both strong and weak light conditions. They offer advantages such as low driving voltage, energy efficiency, and minimal eye strain. Currently, reflective display devices can be categorized into two types based on their material systems: capsule-type and ink-type. Capsule-type reflective display devices achieve black and white display through particles within capsules. Ink-type reflective display devices achieve black and white display through particles in ink. Due to the fluidity of ink, ink-type reflective display devices require reflective microcup structures to ensure a sufficient number of particles in the sub-pixel areas, thereby guaranteeing display quality. Current reflective display technologies suffer from issues such as significant color deviation and low brightness in color display.

[0003] Therefore, current display panels, their manufacturing methods, and electronic devices still need improvement. Summary of the Invention

[0004] The present invention aims to at least alleviate or resolve at least one of the aforementioned problems to some extent.

[0005] In one aspect of the present invention, a display panel is provided, comprising: a first substrate and a second substrate disposed opposite to each other, wherein one side of the second substrate is a light-incident side; a reflective layer located on one side of the first substrate; a color resist layer located on the side of the reflective layer away from the first substrate; a pixel electrode layer located on the side of the color resist layer away from the first substrate, the pixel electrode layer including a plurality of sub-pixel electrodes spaced apart; a common electrode layer located on one side of the second substrate; and pixel isolation pillars located between the first substrate and the second substrate, defining a plurality of sub-pixel regions between the first and second substrates, wherein each sub-pixel region has black charged microspheres and white charged microspheres, wherein each sub-pixel region has at least two sub-pixel electrodes, and the projected area of ​​the sub-pixel electrodes in one sub-pixel region on the first substrate is smaller than the projected area of ​​the color resist layer on the first substrate. This improves the display brightness of the display panel in white mode.

[0006] According to an embodiment of the present invention, the color resist layer includes a plurality of spaced-apart color resist blocks, and the reflective layer includes a plurality of spaced-apart reflective blocks, the reflective blocks being disposed corresponding to the color resist blocks. Thus, color display can be achieved.

[0007] According to an embodiment of the present invention, the method further includes: an insulating layer located on the side of the color resist layer away from the first substrate, and covering the color resist layer and the reflective layer; the insulating layer further includes a plurality of vias, wherein the orthographic projection of the vias on the first substrate does not coincide with the orthographic projection of the reflective layer on the first substrate, and the orthographic projection of the vias on the first substrate does not coincide with the orthographic projection of the color resist layer on the first substrate; the vias are filled with the pixel electrode layer, and the pixel electrode layer is electrically connected to the first substrate through the vias. This facilitates the application of voltage to the pixel electrode layer.

[0008] According to an embodiment of the present invention, the display panel is configured such that, while applying a first voltage to all the sub-pixel electrodes and a second voltage to the common electrode layer, the white charged microspheres are moved to the light-incident side, so that light incident from the light-incident side is reflected by the white charged microspheres and emitted from the light-incident side, thereby achieving a white state display. Thus, a white state display can be achieved.

[0009] According to an embodiment of the present invention, the display panel is configured to: when a first voltage is applied to all the sub-pixel electrodes and a second voltage is applied to the common electrode layer, move the black charged microspheres to the light-incident side, so that light incident from the light-incident side is absorbed by the black charged microspheres, thereby achieving dark-state display. Thus, dark-state display can be achieved.

[0010] According to an embodiment of the present invention, the color resist block includes a red color resist block, a green color resist block, and a blue color resist block. The display panel is configured such that when a first voltage and a second voltage are respectively applied to at least two sub-pixel electrodes within a sub-pixel region, light incident from the light-incident side is reflected by the reflective layer and emitted from the light-incident side, thereby achieving color display. The first voltage and the second voltage are electrically opposite. Thus, color display can be achieved.

[0011] According to an embodiment of the present invention, the difference between the first voltage and the second voltage is -40 to 40V. This improves the color display effect.

[0012] According to an embodiment of the present invention, a sub-pixel region includes a plurality of sub-pixel electrodes, and the difference in applied voltage between adjacent sub-pixel electrodes is a fixed value. This improves the response speed of the display panel.

[0013] According to an embodiment of the present invention, the number of sub-pixel electrodes in one sub-pixel region is no more than 10. This improves the response speed of the display panel.

[0014] According to an embodiment of the present invention, the sub-pixel electrodes within the sub-pixel region are arranged at equal intervals. This improves the response speed of the display panel.

[0015] According to an embodiment of the present invention, the plurality of sub-pixel electrodes within a sub-pixel region are independently powered and controlled by a driving circuit unit. Thus, the voltage of each sub-pixel electrode can be controlled separately.

[0016] According to an embodiment of the present invention, the reflective layer is made of a metallic material, and the reflectivity of the metallic material is not less than 95%. This improves the color display effect of the display panel.

[0017] According to an embodiment of the present invention, the thickness of the color resist layer is 0.5-5 μm. This improves the color display effect of the display panel.

[0018] According to an embodiment of the present invention, the diameter of the charged microspheres is 50-300 nm, and the charge-to-mass ratio of the charged microspheres is 1 × 10⁻⁶. 7 -10×10 7 C / kg. This can improve the response speed and display effect of the display panel.

[0019] In another aspect, the present invention provides a method for preparing the aforementioned display panel, comprising: forming a reflective layer on a first substrate; forming a color resist layer on the side of the reflective layer away from the first substrate; forming a pixel electrode layer on the side of the color resist layer away from the first substrate; forming a common electrode layer on a second substrate; forming pixel isolation pillars on the first substrate and / or the second substrate; aligning the first substrate and the second substrate to form a sub-pixel sealing space; injecting ink into the sub-pixel sealing space and performing a sealing process to obtain the display panel. This method can produce the aforementioned display panel, thus possessing all the features and advantages of the aforementioned display panel, which will not be elaborated further here.

[0020] In another aspect, the present invention provides a display device comprising the aforementioned display panel. Thus, the display device possesses all the features and advantages of the aforementioned display panel, which will not be repeated here. Attached Figure Description

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0022] Figure 1 A schematic diagram of the structure of a display panel according to an embodiment of the present invention is shown;

[0023] Figure 2 This shows a schematic diagram of the structure of a display panel in the related technology;

[0024] Figure 3 This shows a schematic diagram of the structure of a display panel in the related technology;

[0025] Figure 4 A schematic diagram of the structure of a display panel according to yet another embodiment of the present invention is shown;

[0026] Figure 5 A schematic diagram illustrating the principle of a display panel presenting a white state according to an embodiment of the present invention is shown;

[0027] Figure 6 A schematic diagram illustrating the principle of a display panel presenting a dark state according to an embodiment of the present invention is shown;

[0028] Figure 7 A schematic diagram illustrating the principle of a display panel presenting a color display according to an embodiment of the present invention is shown;

[0029] Figure 8 A schematic diagram illustrating the principle of a display panel presenting a color display according to an embodiment of the present invention is shown;

[0030] Figure 9 A partial structural schematic diagram of a method for manufacturing a display panel according to an embodiment of the present invention is shown;

[0031] Figure 10 A partial structural schematic diagram of a method for manufacturing a display panel according to yet another embodiment of the present invention is shown;

[0032] Figure 11 A partial structural schematic diagram of a method for manufacturing a display panel according to yet another embodiment of the present invention is shown;

[0033] Figure 12 A top view showing a portion of the structure of a display panel according to an embodiment of the present invention is shown.

[0034] Explanation of reference numerals in the attached figures:

[0035] 10: Black charged microspheres; 20: White charged microspheres; 110: First substrate; 111: Reflective layer; 112: Color resist layer; 113: Insulating layer; 114: Through hole; 120: Second substrate; 210: Sub-pixel electrode; 220: Common electrode layer; 300: Pixel isolation pillar. Detailed Implementation

[0036] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0037] In one aspect of the invention, a display panel is provided, with reference to... Figure 1 and Figure 4 The system includes: a first substrate 110 and a second substrate 120 disposed opposite to each other, with one side of the second substrate 120 being the light-incident side; a reflective layer 111 located on one side of the first substrate 110; a color resist layer 112 located on the side of the reflective layer 111 away from the first substrate 110; a pixel electrode layer located on the side of the color resist layer 112 away from the first substrate 110, the pixel electrode layer including a plurality of sub-pixel electrodes 210 spaced apart; and a common electrode layer 220 located on the second substrate 120. On one side of the 0; a pixel isolation pillar 300 is located between the first substrate 110 and the second substrate 120, defining a plurality of sub-pixel regions between the first substrate 110 and the second substrate 120. Each sub-pixel region contains black charged microspheres 10 and white charged microspheres 20. Each sub-pixel region has at least two sub-pixel electrodes 210, and the projected area of ​​the sub-pixel electrode 210 on the first substrate 110 is smaller than the projected area of ​​the color resist layer 112 on the first substrate 110 within that sub-pixel region. By increasing the horizontal electric field formed by the sub-pixel electrodes and fabricating the color resist layer and pixel electrodes on the same side substrate, the display brightness during white state display is effectively improved while satisfying white state, dark state, and color display requirements.

[0038] To facilitate understanding, the principle behind the aforementioned beneficial effects of the display panel in this application will be explained below:

[0039] There are two main types of color in reflective display devices in related technologies: color display is achieved by increasing the variety of colors of charged particles in the ink, or color display is achieved by adding a color resist layer to the back plate on the light-emitting side.

[0040] The inventor discovered, based on Figure 2 When color display is achieved by increasing the number of charged particles in the ink to achieve color display, such as by filling the reflective cup with ink containing three-color particles (particles 1', 2', and 3') to achieve three-color display, or by adding n-color particles to the ink to achieve n-color display, the limited selection of colored particles in the ink makes it impossible to meet the practical needs of multiple specific colors. Furthermore, when the ink contains multi-color particles, it is difficult to apply voltage to drive multiple particles to move simultaneously and controllably. Under the three display effects of 100a, 100b, and 100c, it is necessary to precisely control the electric field between the upper and lower substrates so that particles of different colors are in their corresponding positions to achieve color display. The device is difficult to control, resulting in poor display effect of the final reflective device.

[0041] The inventors also discovered that, reference Figure 3 When color display is achieved by adding a color resist layer to the back panel on the light-emitting side, if white display is required, taking a color resist layer including a conventional red color resist layer R, a green color resist layer G, and a blue color resist layer B as an example, a mixed bright state of red, green, and blue is needed to achieve white display. However, the filtering and absorption of ambient light by the color resist layer causes a significant decrease in the final white state brightness. The intensity of the emitted light after reflection by the reflection structure 100' is significantly lower than the intensity of the incident light, resulting in poor display brightness of the display device in the white state, which cannot meet the usage requirements.

[0042] The display panel in this invention, based on the original vertical electric field of the e-ink reflective display device, references... Figure 1 and Figure 4 By increasing the horizontal electric field formed by the pixel electrode layer including multiple sub-pixel electrodes 210, and fabricating the color resist layer 112 and the sub-pixel electrodes 210 on the same side substrate 110, while realizing color display, the ambient light does not pass through the color resist layer when the display panel displays white, thereby effectively improving the display brightness in white state. This effectively solves the problem of low white state brightness caused by low transmittance of the color resist layer in the color reflective display scheme of related technologies.

[0043] To facilitate understanding, the working principle of the display panel in this application will be briefly explained below:

[0044] According to some embodiments of the present invention, the display panel is configured such that, while a first voltage is applied to all sub-pixel electrodes and a second voltage is applied to the common electrode layer, white charged microspheres are moved to the light-incident side, so that light incident from the light-incident side is reflected by the white charged microspheres and emitted from the light-incident side, thereby achieving a white state display. Specifically, refer to... Figure 5 When a voltage is applied to all sub-pixel electrodes to attract black charged microspheres, the black charged microspheres gather near the pixel electrode area, and the white charged microspheres gather near the common electrode area. Ambient light (such as...) Figure 5 The reflection occurs at the white microsphere on the light-emitting side (as indicated by the solid arrow). Figure 5 (As shown by the dashed arrow), a white state is achieved. At this time, ambient light is reflected directly at the white microspheres without passing through the color resist layer, maximizing the utilization of ambient light and significantly improving the brightness of the white state.

[0045] According to some embodiments of the present invention, the display panel is configured to: when a first voltage is applied to all sub-pixel electrodes and a second voltage is applied to the common electrode layer, move black charged microspheres to the light-incident side, so that light incident from the light-incident side is absorbed by the black charged microspheres, thereby achieving dark-state display. Specifically, refer to... Figure 6When a voltage is applied to all sub-pixel electrodes to attract white charged microspheres, the white charged microspheres gather near the pixel electrode area, and the black charged microspheres gather near the common electrode area. At this time, ambient light is absorbed at the black microspheres, achieving a dark state.

[0046] According to some embodiments of the present invention, the structure of the color resist layer is not particularly limited. For example, when the display panel needs to perform color display, the color resist layer 112 may include a plurality of spaced-apart color resist blocks. In this case, the reflective layer may include a plurality of spaced-apart reflective blocks, which are correspondingly arranged with the color resist blocks. It is understood that the reflective layer may also be a single-layer structure, as long as it can reflect incident light. Specifically, the color resist blocks may include red, green, and blue color resist blocks. The display panel is configured such that when a first voltage and a second voltage are applied to at least two sub-pixel electrodes in a sub-pixel region, light incident from the incident light side is reflected by the reflective layer and emitted from the incident light side to achieve color display, wherein the first voltage and the second voltage are electrically opposite.

[0047] Further, refer to Figure 7 and Figure 8 Taking a blue color resist as an example, when the common electrode layer is grounded or a fixed common voltage (e.g., -20V to 20V) is applied, and a gradient voltage is applied to multiple sub-pixel electrodes within a sub-pixel through the thin-film transistor corresponding to each sub-pixel electrode, the black and white charged microspheres move along the electric field lines shown in the figure (reference). Figure 8 (As indicated by the dashed arrow in the image) migration occurs, with black and white charged microspheres migrating and accumulating at the sub-pixel electrodes in the edge region of the reflector cup, respectively. External ambient light (such as...) Figure 7 (As shown by the solid arrow) The light is filtered into blue light by the color resist layer. After being reflected by the reflective layer, the blue light is reflected out of the reflective cup (as shown by the solid arrow). Figure 7 (As shown by the dashed arrow), the sub-pixel display appears blue. The ink solution, except for the black and white charged microspheres, is a transparent solution. The reflective layer has a higher reflectivity than the white charged microspheres. Although the incident light has a longer optical path after reflection through the reflective layer, it still has high light intensity. It can be understood that when color resists of different colors are used, the sub-pixels can display different colors. By combining multiple colors of color resists, multiple colors of sub-pixels can be displayed, thus achieving a color display on the display panel.

[0048] According to some embodiments of the present invention, the control method for applying voltage to sub-pixel electrodes is not particularly limited. For example, multiple sub-pixel electrodes in a sub-pixel region can be independently powered and controlled by corresponding driving circuit units, thereby controlling the voltage of each sub-pixel electrode separately. Specifically, the driving circuit unit may include a thin-film transistor.

[0049] According to some embodiments of the present invention, the structure of the display panel is not particularly limited, for example, referring to Figure 6 and Figure 12 The display panel may further include an insulating layer 113, which is located on the side of the color resist layer 112 away from the first substrate 110 and covers the color resist layer 112 and the reflective layer 111. According to other embodiments of the invention, the structure of the insulating layer is not particularly limited; for example, refer to… Figure 12 (The figure only includes the first substrate, the reflective layer (not shown), the color resist layer and the insulating layer). The insulating layer 113 may further include a plurality of through holes 114. The orthographic projection of the through holes 114 on the first substrate 110 does not coincide with the orthographic projection of the reflective layer 111 on the first substrate 110. The orthographic projection of the through holes 114 on the first substrate 110 does not coincide with the orthographic projection of the color resist layer 112 on the first substrate 110. The through holes 114 are filled with the pixel electrode layer 210, that is, the material of the sub-pixel electrode 210. The pixel electrode layer (that is, the sub-pixel electrode 210) is electrically connected to the first substrate 110 through the through holes 114, so that the sub-pixel electrode can be precisely voltage controlled by the driving circuit structure on the first substrate.

[0050] According to some embodiments of the present invention, the voltage applied to multiple sub-pixel electrodes within a sub-pixel region is not particularly limited, as long as the voltages applied to adjacent sub-pixel electrodes have a certain difference along a certain direction. For example, referencing... Figure 1 When there are only two sub-pixel electrodes 210 in a sub-pixel region, taking the voltage applied to one sub-pixel electrode as the first voltage and the voltage applied to the other sub-pixel electrode as the second voltage as an example, when the difference between the first voltage and the second voltage is -40 to 40V, the above-mentioned color display effect can be achieved; for example, refer to Figure 4 and Figure 7 When a sub-pixel region has multiple sub-pixel electrodes 210, the particles move more fully under the action of the horizontal electric field. Taking the voltage applied to the sub-pixel electrode near one edge as the first voltage and the voltage applied to the sub-pixel electrode near the other edge as the second voltage as an example, as long as the difference between the first voltage and the second voltage is -40 to 40V, and the voltage applied to adjacent sub-pixel electrodes increases or decreases along the direction from the sub-pixel electrode to which the first voltage is applied to the sub-pixel electrode to which the second voltage is applied, the above-mentioned color display effect can be achieved.

[0051] According to some embodiments of the present invention, when a sub-pixel region has multiple sub-pixel electrodes 210, the specific value of the voltage applied to the multiple sub-pixel electrodes is not particularly limited. For example, when a sub-pixel region includes multiple sub-pixel electrodes, the difference in applied voltage between adjacent sub-pixel electrodes can be made a fixed value, thereby improving the uniformity of the electric field formed by adjacent sub-pixel electrodes, thereby increasing the migration rate of charged microspheres under the electric field, and ultimately improving the response speed of the display panel. Specifically, within a sub-pixel region, the difference in applied voltage between adjacent sub-pixel electrodes can be 0.5 to 5V.

[0052] According to some embodiments of the present invention, the number of sub-pixel electrodes within a sub-pixel region is not particularly limited; for example, the number of sub-pixel electrodes within a sub-pixel region may not exceed 10. As the number of sub-pixel electrodes within a sub-pixel region increases, the migration rate of black and white charged microspheres during color display will be faster, thereby improving the response speed of the display panel. Correspondingly, even if the sub-pixel electrode is a transparent electrode, the sub-pixel electrode 210 will inevitably partially block the color resist layer and reflective layer, thus reducing the area of ​​a single sub-pixel. Furthermore, when there are too many sub-pixel electrodes within a sub-pixel region, the fabrication precision requirements are high, and each sub-pixel electrode requires independent thin-film transistor control, resulting in higher process costs. When the number of sub-pixel electrodes within a sub-pixel region is no more than 10, both a higher display panel response speed and a larger single sub-pixel area can be achieved.

[0053] According to some embodiments of the present invention, the spacing between sub-pixel electrodes within a sub-pixel region is not particularly limited. For example, the sub-pixel electrodes within a sub-pixel region can be arranged at equal intervals, thereby improving the uniformity of the electric field formed by adjacent sub-pixel electrodes, thereby increasing the migration rate of charged microspheres under the electric field, and ultimately improving the response speed of the display panel.

[0054] According to some embodiments of the present invention, the material of the reflective layer is not particularly limited. For example, when the reflectivity of the reflective layer material is not less than 80%, the reflective layer can meet the requirements of color display. Furthermore, the material forming the reflective layer can be a metallic material, and the reflectivity of the metallic material can be not less than 95%, thereby significantly improving the color display effect of the display panel. Specifically, the metallic material can include metals with high reflectivity such as Ag and Al.

[0055] According to some embodiments of the present invention, the thickness of the color resist layer is not particularly limited, as long as it can filter the incident light into monochromatic light of the corresponding color. For example, the thickness of the color resist layer can be 0.5-5 μm.

[0056] According to some embodiments of the present invention, the charged microspheres include black charged microspheres and white charged microspheres. The size and charge of the charged microspheres are not particularly limited. For example, the diameter of the charged microspheres can be 50-300 nm. Furthermore, the charge-to-mass ratio of the charged microspheres can be 1 × 10⁻⁶. 7 -10×10 7 C / kg, which can improve the response speed of charged microspheres.

[0057] It is understood that the charged microspheres in this application include spherical charged particles and / or near-spherical charged particles, and those skilled in the art can choose according to the actual situation.

[0058] According to some embodiments of the present invention, the materials used to form the pixel electrode layer and the common electrode layer are not particularly limited, as long as they are transparent electrode materials.

[0059] In another aspect, the present invention provides a method for manufacturing the aforementioned display panel, which possesses all the features and advantages of the aforementioned display panel, and will not be repeated here. Specifically, it includes the following steps:

[0060] According to some embodiments of the present invention, reference Figure 9 In this step, a reflective layer can be formed on the first substrate; a color resist layer can be formed on the side of the reflection away from the first substrate. Specifically, a reflective layer 111 can be deposited on the first substrate 110 and patterned to form multiple reflective blocks. A color resist layer can then be prepared on the patterned reflective layer 111 and patterned, or the patterned color resist layer can be directly prepared to finally obtain multiple color resist blocks corresponding to the reflective blocks.

[0061] According to some embodiments of the present invention, reference Figure 10 In this step, a pixel electrode layer is formed on the side of the color resist layer away from the first substrate. Specifically, an insulating layer 113 can be deposited on the color resist layer 112 and patterned to form multiple vias, so that the sub-pixel electrodes can be electrically connected to the driving circuit under the insulating layer. Then, after the insulating layer is prepared, a pixel electrode layer is deposited on the insulating layer and patterned to obtain multiple spaced sub-pixel electrodes.

[0062] According to some embodiments of the present invention, the insulating layer material is not particularly limited. For example, the material forming the insulating layer may include organic insulating layer material or inorganic insulating layer material.

[0063] According to some embodiments of the present invention, reference Figure 11In this step, a common electrode layer is formed on the second substrate, and pixel isolation pillars are formed on the first substrate and / or the second substrate. Specifically, the method of forming the pixel isolation pillars is not particularly limited. For example, the pixel isolation pillars can be formed by nanoimprinting or exposure development processes.

[0064] According to some embodiments of the present invention, reference Figure 1 and Figure 4 In this step, the first substrate and the second substrate are joined together to form a sub-pixel sealed space; ink is injected into the sub-pixel sealed space and a sealing process is performed to obtain a display panel. This display panel, based on the original vertical electric field of the ink-type reflective display device, adds a horizontal electric field formed by the pixel electrode layer including multiple sub-pixel electrodes 210, and fabricates the color resist layer 112 and the sub-pixel electrodes 210 on the same side substrate 110. This achieves color display while also ensuring that ambient light does not pass through the color resist layer when the display panel is in a white state, thereby effectively improving the display brightness in the white state. This effectively solves the problem of low white state brightness caused by low transmittance of the color resist layer in related color reflective display schemes.

[0065] In another aspect, the present invention provides a display device comprising the aforementioned display panel. Thus, the display device possesses all the features and advantages of the aforementioned display panel, which will not be repeated here.

[0066] Unless otherwise stated, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. All patents and publications related to this invention are incorporated herein by reference in their entirety. The terms "comprising" or "including" are open-ended expressions, meaning they include what is specified in this invention but do not exclude other aspects. In this invention, all figures disclosed herein, whether or not the words "about" or "approximately" are used, are approximate values. The numerical value of each figure may vary by less than 10% or by a difference that is considered reasonable by one of ordinary skill in the art, such as 1%, 2%, 3%, 4%, or 5%.

[0067] In the description of this invention, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0068] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0069] In the description of this invention, "a plurality of" means two or more.

[0070] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0071] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0072] In the description of this application, "A and / or B" can include any of the cases of A alone, B alone, or A and B, where A and B are merely examples and can be any technical feature connected by "and / or" in this application.

[0073] In the description of this specification, references to terms such as "one embodiment," "another embodiment," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment is included in at least one embodiment of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples, without contradiction. Additionally, it should be noted that in this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0074] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A display panel, characterized in that, include: A first substrate and a second substrate are arranged opposite to each other, with one side of the second substrate being the light incident side; A reflective layer, wherein the reflective layer is located on one side of the first substrate; A color resist layer, wherein the color resist layer is located on the side of the reflective layer away from the first substrate; A pixel electrode layer is located on the side of the color resist layer away from the first substrate. The pixel electrode layer includes a plurality of sub-pixel electrodes, which are spaced apart. A common electrode layer, wherein the common electrode layer is located on one side of the second substrate; A pixel isolation pillar is located between a first substrate and a second substrate, defining a plurality of sub-pixel regions between the first and second substrates. Each sub-pixel region contains black charged microspheres and white charged microspheres. In one of the sub-pixel regions, there are at least two sub-pixel electrodes, and the projected area of ​​the sub-pixel electrodes in one of the sub-pixel regions on the first substrate is smaller than the projected area of ​​the color resist layer on the first substrate. The color resist layer includes a plurality of color resist blocks spaced apart, and the reflective layer includes a plurality of reflective blocks spaced apart, with the reflective blocks corresponding to the color resist blocks; The device further includes: an insulating layer located on the side of the color resist layer away from the first substrate, and covering the color resist layer and the reflective layer; the insulating layer further includes a plurality of through holes, the orthographic projection of the through holes on the first substrate does not coincide with the orthographic projection of the reflective layer on the first substrate, the orthographic projection of the through holes on the first substrate does not coincide with the orthographic projection of the color resist layer on the first substrate, the through holes are filled with the pixel electrode layer, and the pixel electrode layer is electrically connected to the first substrate through the through holes.

2. The display panel according to claim 1, characterized in that, The display panel is configured to: when a first voltage is applied to all the sub-pixel electrodes and a second voltage is applied to the common electrode layer, move the white charged microspheres to the light-incident side so that the light incident from the light-incident side is reflected by the white charged microspheres and emitted from the light-incident side to achieve white state display.

3. The display panel according to claim 1, characterized in that, The display panel is configured to: when a first voltage is applied to all the sub-pixel electrodes and a second voltage is applied to the common electrode layer, move the black charged microspheres to the light-incident side so that the light incident from the light-incident side is absorbed by the black charged microspheres to achieve dark-state display.

4. The display panel according to claim 1, characterized in that, The color resist blocks include a red color resist block, a green color resist block, and a blue color resist block. The display panel is configured such that when a first voltage and a second voltage are applied to at least two of the sub-pixel electrodes in the sub-pixel region, light incident from the incident light side is reflected by the reflective layer and emitted from the incident light side to achieve color display, wherein the first voltage and the second voltage are of opposite electrical polarity.

5. The display panel according to claim 4, characterized in that, The difference between the first voltage and the second voltage is -40 to 40V.

6. The display panel according to claim 4, characterized in that, A sub-pixel region includes a plurality of sub-pixel electrodes, and the difference in applied voltage between adjacent sub-pixel electrodes is a fixed value.

7. The display panel according to claim 6, characterized in that, The number of sub-pixel electrodes in a sub-pixel region is no more than 10.

8. The display panel according to claim 6, characterized in that, The sub-pixel electrodes within the sub-pixel region are arranged at equal intervals.

9. The display panel according to claim 6, characterized in that, The multiple sub-pixel electrodes within a sub-pixel region are independently powered and controlled by a driving circuit unit.

10. The display panel according to claim 1, wherein the reflective layer is made of a metallic material, and the reflectivity of the metallic material is not less than 95%.

11. The display panel according to claim 1, characterized in that, The thickness of the color resist layer is 0.5-5 μm.

12. The display panel according to claim 1, characterized in that, The charged microspheres have a diameter of 50-300 nm and a charge-to-mass ratio of 1 × 10⁻⁶. 7 -10×10 7 C / kg.

13. A method for preparing a display panel according to any one of claims 1-12, characterized in that: include: A reflective layer is formed on the first substrate; A color resist layer is formed on the side of the reflection away from the first substrate; A pixel electrode layer is formed on the side of the color resist layer away from the first substrate; A common electrode layer is formed on the second substrate; Pixel isolation pillars are formed on the first substrate and / or the second substrate; The first substrate and the second substrate are joined together to form a sub-pixel sealed space; Ink is injected into the sealed space of the sub-pixel and then sealed to obtain the display panel.

14. A display device, characterized in that, Includes the display panel as described in any one of claims 1-12.

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