Electronic paper display panel and display device

Abstract

The invention relates to the field of display panels, in particular to an electronic paper display panel and a display device. The electronic paper display panel comprises a pixel layer and a driving circuit for controlling display of the pixel layer, the pixel layer comprises first sub-pixels arranged in an array mode, and the driving circuit comprises pixel electrodes arranged corresponding to the first sub-pixels; the first sub-pixel comprises a pixel sub-cavity, a first color film layer and black charged particles, and the first color film layer is arranged in the pixel sub-cavity and is red, green or blue; the pixel sub-cavities are filled with the black charged particles, and the black charged particles can be driven by the pixel electrodes to move towards the upper portion of the first color film layer or move away from the upper portion of the first color film layer; the first color film layer is shielded when the black charged particles move to the position above the first pixel sub-cavities, and the first color film layer is exposed and the first sub-pixels display corresponding colors when the black charged particles move away from the position above the first color film layer. The electronic paper display panel can improve the display effect.

Description

Technical Field

[0001] The present application relates to the field of display panels, and in particular to an electronic paper display panel and a display device. Background Art

[0002] At present, electronic paper has been widely used. The most common electronic paper on the market is black and white electronic paper, while three-color electronic paper (black, white and red) and color electronic paper are relatively rare. Electronic paper has excellent properties such as low power consumption and long life. Color electronic paper can display multiple colors without backlight. Compared with black and white electronic paper, it has a wider range of uses and will have broad application prospects in the future display market. However, at present, the display effect of color electronic paper needs to be improved. Summary of the invention

[0003] The present application provides an electronic paper display panel and a display device, wherein the electronic paper display panel can improve display effects.

[0004] In a first aspect, the present application provides an electronic paper display panel, comprising a pixel layer and a driving circuit for controlling display of the pixel layer, wherein the pixel layer comprises first sub-pixels arranged in an array, and the driving circuit comprises pixel electrodes arranged corresponding to the first sub-pixels; the first sub-pixels comprise:

[0005] pixel sub-cavity;

[0006] A first color filter layer, disposed in the pixel sub-cavity, the first color filter layer being red, green or blue;

[0007] Black charged particles are filled in the pixel sub-cavity and are configured to move toward or away from the top of the first color filter layer under the drive of the pixel electrode; when the black charged particles move to the top of the first color filter layer, the first color filter layer is blocked, and when the black charged particles move away from the top of the first color filter layer, the first color filter layer is exposed and the first sub-pixel displays a corresponding color.

[0008] In some embodiments, the pixel electrode includes a first electrode and a second electrode, and the first electrode and the second electrode are respectively disposed above and below the first color filter layer;

[0009] The first color filter layer divides the pixel subcavity into a first cavity in an upper layer and a second cavity in a lower layer. The first color filter layer is provided with a particle channel connecting the first cavity and the second cavity and allowing the black charged particles to pass through.

[0010] In some embodiments, a support member for supporting the first color filter layer is disposed in the pixel sub-cavity.

[0011] In some embodiments, a second color filter layer is provided at the bottom of the pixel subcavity, and the second color filter layer has the same color as the first color filter layer; the second color filter layer is located below the first color filter layer, and the projection of the second color filter layer on the first color filter layer at least covers the particle channel.

[0012] In some embodiments, the upper surface of the first color filter layer is a slope extending downwardly toward the particle channel.

[0013] In some embodiments, the pixel electrode includes a first vertical electrode disposed on both sides of the pixel sub-cavity, and a second vertical electrode disposed in the center of the pixel sub-cavity, and the first vertical electrode and the second vertical electrode are disposed parallel to each other;

[0014] The upper surface of the first color filter layer is an inclined surface extending downward from the center to both sides thereof, and both sides of the upper surface of the first color filter layer form a collection area for collecting black charged particles, and the second vertical electrode is arranged in the center of the first color filter layer;

[0015] The first vertical electrode is used to adsorb the black charged particles in a first power-on state, so that the black charged particles move away from the upper surface of the first color filter layer, and the second vertical electrode is used to adsorb the black charged particles in a second power-on state, so that the black charged particles adhere to the upper surface of the first color filter layer.

[0016] In some embodiments, the longitudinal section of the first color filter layer is an isosceles triangle, and the second vertical electrode is located on a perpendicular bisector of the bottom surface of the first color filter layer.

[0017] In some embodiments, the upper surface of the first color filter layer is configured as an inclined surface extending downward from both sides toward the center and arranged opposite to each other, and the center of the upper surface of the first color filter layer forms a gathering area for gathering black charged particles, and the pixel electrode is arranged in contact with the upper surface of the first color filter layer.

[0018] In some embodiments, a reflector is provided on the top of the pixel sub-cavity, and the reflector is arranged corresponding to the collection area; when the black charged particles leave the upper surface of the first color filter layer and collect in the collection area, the reflector is used to reflect the light irradiated to the reflector to the upper surface of the first color filter layer.

[0019] In a second aspect, the present application provides a display device, using any of the electronic paper display panels described above.

[0020] The above-mentioned technical scheme provided by the embodiment of the present application has the following advantages compared with the prior art: different electric fields are generated by means of the pixel electrodes of the driving circuit, so that the black charged particles in the pixel sub-cavity move in the pixel sub-cavity; when the pixel electrode generates a first electric field to drive the black charged particles to move toward the top of the first color filter layer, the black charged particles block the first color filter layer, so that the first sub-pixel displays black; when the pixel electrode generates a second electric field to drive the black charged particles to move away from the top of the first color filter layer, the first color filter layer is exposed, so that the first sub-pixel displays the same color as the first color filter layer in its pixel sub-cavity.

[0021] The display state is switched by controlling the pixel electrode to drive the movement of black charged particles, thereby ensuring the response speed of the electronic paper display panel; different first sub-pixels reflect the incident light through the first color film layer of the corresponding color to display red, green and blue. Compared with the floating display using red, green and blue charged particles, the display uniformity and stability are better, which helps to improve the display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0024] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0025] Figure 1 A schematic diagram of a pixel arrangement of a first sub-pixel in a sub-pixel unit of an electronic paper display panel provided in an embodiment of the present application;

[0026] Figure 2 A schematic diagram of another pixel arrangement of a first sub-pixel in a sub-pixel unit of an electronic paper display panel provided in an embodiment of the present application;

[0027] Figure 3 for Figure 1 A schematic diagram of pixel arrangement of sub-pixel units of an electronic paper display panel;

[0028] Figure 4A longitudinal cross-sectional view of a first sub-pixel provided in the first embodiment of the present application;

[0029] Figure 5 A top view of a first sub-pixel provided in the first embodiment of the present application;

[0030] Figure 6 A longitudinal cross-sectional view of a first sub-pixel provided in a second embodiment of the present application;

[0031] Figure 7 A longitudinal cross-sectional view of a first sub-pixel provided in a third embodiment of the present application;

[0032] Figure 8 A longitudinal cross-sectional view of a first sub-pixel provided in a fourth embodiment of the present application;

[0033] Fig. 9 A longitudinal cross-sectional view of the first sub-pixel provided in the fifth embodiment of the present application.

[0034] Description of reference numerals:

[0035] 10-first electrode; 20-sub-pixel unit; 30-sub-pixel area; 31-first sub-pixel; 32-pixel sub-cavity; 33-black charged particles; 34-transparent charged particles; 35-first color filter layer; 36-second color filter layer; 37-support member; 40-second electrode; 50-first vertical electrode; 60-second vertical electrode; 70-inclined electrode; 80-collecting electrode; 90-reflective member. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0037] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0038] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0039] In order to solve the technical problem of poor display effect of electronic paper display panels in the prior art, the present application provides an electronic paper display panel and a display device, which can ensure the response speed of the electronic paper display panel and improve the display effect. It should be noted that the "up", "down", "left" and "right" referred to in this application are all based on the electronic paper display panel when it is placed horizontally. Among them, "up" refers to the side of the electronic paper display panel close to the light-emitting side or the display side. In the accompanying drawings and the embodiments below, "R" represents red, "G" represents green, and "B" represents blue.

[0040] The present application embodiment provides an electronic paper display panel, such as Figures 1 to 4 As shown, the electronic paper display panel includes a display layer and a driving circuit for controlling the display layer to display. The display layer includes sub-pixel units 20 arranged in an array, and the sub-pixel units 20 include sub-pixel regions 30 that can display red, green and blue respectively, and each sub-pixel region 30 includes a plurality of first sub-pixels 31 that can display the same color, and the driving circuit includes pixel electrodes arranged in a one-to-one correspondence with the first sub-pixels 31. The electronic paper display panel can display by controlling the first sub-pixel 31 of a certain sub-pixel region 30 of the sub-pixel unit 20, so that the sub-pixel unit 20 displays red, green or blue colored light; or control all the sub-pixel regions 30 of the sub-pixel unit 20 to switch to black, so that the sub-pixel unit 20 displays black.

[0041] The present application mainly improves the structure of the first sub-pixel 31, so as to ensure the response speed of the electronic paper display panel and improve the display effect. The first sub-pixel 31 includes a pixel sub-cavity 32, a first color filter layer 35 arranged in the pixel sub-cavity 32, and black charged particles 33 filled in the pixel sub-cavity 32. Among them, the pixel electrode is used to generate a preset electric field, thereby driving the black charged particles 33 to move toward or away from the upper surface of the first color filter layer 35. Different electric fields are generated by the pixel electrodes of the driving circuit, so that the black charged particles 33 in the pixel sub-cavity 32 move in the pixel sub-cavity 32, thereby controlling the display color (state) of the first sub-pixel 31.

[0042] When the pixel electrode generates a first electric field to drive the black charged particles 33 to move toward the top of the first color filter layer 35, the black charged particles 33 shield the first color filter layer 35, so that the first sub-pixel 31 displays black. When the pixel electrode generates a second electric field to drive the black charged particles 33 to move away from the top of the first color filter layer 35, the first color filter layer 35 is exposed, so that the first sub-pixel 31 displays the same color as the first color filter layer 35 in its pixel sub-cavity 32.

[0043] The switching of the display state is achieved by controlling the pixel electrode to drive the movement of the black charged particles 33, thereby ensuring the response speed of the electronic paper display panel; different first sub-pixels 31 respectively reflect the incident light through the first color filter layer 35 of the corresponding color to display red, green and blue. Compared with the floating of red, green and blue charged particles or the display with the help of backlight, the display uniformity and stability are better, which helps to improve the display effect. In addition, the electronic paper display panel displays by reflecting the incident light without backlight, which can significantly reduce the display power consumption of the electronic paper display panel.

[0044] The structure of the first sub-pixel 31 and the principle that the pixel electrode drives the black charged particles 33 to move in the pixel sub-cavity 32 to achieve display state switching will be described below in conjunction with the accompanying drawings and specific embodiments.

[0045] Embodiment 1

[0046] See also Figure 4 and Figure 5 In this embodiment, the first sub-pixel 31 includes a pixel sub-cavity 32, a first color filter layer 35 and black charged particles 33, and the pixel electrode includes a first electrode 10 and a second electrode 40. The first electrode 10, the pixel sub-cavity 32 and the second electrode 40 are stacked in sequence from the display side to the direction away from the display side. The first color filter layer 35 is a red color filter layer. In other first sub-pixels 31, the first color filter layer 35 can also be a green or blue color filter layer, so that different first sub-pixels 31 display red, green or blue through different first color filter layers 35.

[0047] The first electrode 10 is a transparent electrode to avoid affecting the reflected light and display of the first color filter layer 35. The second electrode 40 can be a transparent electrode as needed. The first color filter layer 35 is arranged in the middle of the pixel sub-cavity 32, and the pixel sub-cavity 32 is divided into a first cavity and a second cavity isolated from each other. The black charged particles 33 are filled in the pixel sub-cavity 32. The first color filter layer 35 can be arranged in an array to open a plurality of particle channels connecting the first cavity and the second cavity. The size of the particle channel is larger than the size of the black charged particles 33, so that the black charged particles 33 can move between the first cavity and the second cavity through the particle channel. The pixel sub-cavity 32 is filled with an anti-permeability liquid, which can achieve an anti-permeability effect and facilitate the electrophoresis of the black charged particles 33 to improve the response speed.

[0048] Exemplarily, the charge carried by the black charged particles 33 may be a negative charge. When the first electrode 10 is connected to the positive electrode of the driving circuit and the second electrode 40 is connected to the negative electrode of the driving circuit, a first electric field is generated between the first electrode 10 and the second electrode 40. Under the action of the first electric field, the black charged particles 33 pass through the particle channel and move from the second cavity of the lower layer to the first cavity of the upper layer, so that the black charged particles 33 move to the top of the first color filter layer 35 to block the first color filter layer 35. At this time, the light incident on the pixel subcavity 32 is absorbed by the black charged particles 33 and cannot be irradiated to the first color filter layer 35 to achieve reflective display.

[0049] When the first electrode 10 is connected to the negative electrode of the driving circuit and the second electrode 40 is connected to the positive electrode of the driving circuit, a second electric field is generated between the first electrode 10 and the second electrode 40. Under the action of the second electric field, the black charged particles 33 pass through the particle channel and enter the second cavity of the lower layer from the first cavity of the upper layer, and the black charged particles 33 no longer block the upper surface of the first color filter layer 35. At this time, the light incident on the pixel sub-cavity 32 reaches the upper surface of the first color filter layer 35, the light with a different color from the first color filter layer 35 is absorbed, and the light with the same color as the first color filter layer 35 is reflected out of the pixel sub-cavity 32, so that the first sub-pixel 31 displays the same color as the first color filter layer 35 inside it, that is, red, green or blue.

[0050] In the above embodiment, by controlling the first electrode 10 and the second electrode 40 to be energized respectively, a preset electric field is generated between the first electrode 10 and the second electrode 40, and the preset electric field is used to drive the black charged particles 33 to move toward and away from the top of the first color filter layer 35, thereby controlling the first sub-pixel 31 to switch between a black state and a color state reflected and displayed by the first color filter layer 35.

[0051] In a specific implementation, the black charged particles 33 can also be set to be positively charged, and the power-on state of the first electrode 10 and the second electrode 40 and the preset electric field between the two can be adaptively changed. The pixel subcavity 32 can also be filled with transparent charged particles 34 with the opposite charge to the black charged particles 33, and the transparent charged particles 34 can be spherical. When the black charged particles 33 move through the particle channel to the second cavity of the lower layer under the action of the electric field between the first electrode 10 and the second electrode 40, the transparent charged particles 34 move through the particle channel to the first cavity of the upper layer. Since the spherical transparent particles can play the role of a lens and can refract more ambient light, more light is irradiated to the upper surface of the first color filter layer 35, and more light is reflected into the human eye, which can increase visibility and brightness.

[0052] The particle channels of the first color filter layer 35 may be distributed in a grid shape as shown in the figure, and may be opened at set intervals as required. The opening of the particle channels only needs to ensure that the black charged particles 33 and the transparent charged particles 34 can pass through.

[0053] In some embodiments, in order to ensure that the first color filter layer 35 is stably fixed in the middle position in the depth direction of the pixel sub-cavity 32, a support member 37 may be further provided in the pixel sub-cavity 32, and the support member 37 is provided below the first color filter layer 35. With the help of the support member 37, the reliability of fixing the first color filter layer 35 may be improved. Specifically, the support member 37 may be provided on both sides or the periphery below the first color filter layer 35, and the support member 37 and the particle channel of the first color filter layer 35 are avoided to avoid affecting the movement of the black charged particles 33 and the transparent charged particles 34 between the first cavity and the second cavity.

[0054] The first electrode 10 and the second electrode 40 can be ITO (Indium tin oxide) thin film electrodes, which are arranged parallel to each other. ITO thin film has the characteristics of high light transmittance, low resistivity and good chemical stability. ITO thin film mainly plays the role of conductivity and light transmission in electronic devices, and is an important component to achieve the performance of electronic devices.

[0055] It should be noted that the first electrode 10 and the second electrode 40 can not only be arranged on the top and the bottom outside the pixel sub-cavity 32, but also can be arranged inside the pixel sub-cavity 32 as required. It is sufficient to ensure that the first electrode 10 and the second electrode 40 are respectively located above and below the first color filter layer 35 and are respectively connected to different electrodes of the driving circuit.

[0056] Embodiment 2

[0057] refer to Figure 6, the setting of the first sub-pixel 31 refers to the first embodiment, that is, the first sub-pixel 31 includes a pixel sub-cavity 32, a first color filter layer 35 and black charged particles 33, and the pixel electrode includes a first electrode 10 and a second electrode 40. The first color filter layer 35 separates the pixel sub-cavity 32 into a first cavity located in the upper layer and a second cavity located in the lower layer, and the first cavity and the second cavity are connected through a particle channel. What is different is that the first sub-pixel 31 provided in this embodiment also includes a second color filter layer 36. The second color filter layer 36 has the same color as the first color filter layer 35 and is arranged below the first color filter layer 35, and the orthographic projection of the second color filter layer 36 on the first color filter layer 35 at least covers the particle channel.

[0058] In other words, the second color filter layer 36 can be set only corresponding to the area of ​​the particle channel, or it can cover the entire cross-section of the pixel sub-cavity 32, as long as the second color filter layer 36 is transparent enough to cover the particle channel in the positive state of the first color filter layer 35, so as to supplement the display of the particle channel area with the help of the second color filter layer 36 to improve the display effect.

[0059] When the first sub-pixel 31 needs to be displayed as black, the black charged particles 33, driven by the first electrode 10 and the second electrode 40, enter the first cavity of the upper layer from the second cavity of the lower layer along the particle channel, that is, the black charged particles 33 move to the top of the first color filter layer 35, and block the parts of the first color filter layer 35 and the second color filter layer 36 corresponding to the particle channel.

[0060] When the first sub-pixel 31 needs to display with the help of the first color filter layer 35, the black charged particles 33 enter the second cavity of the lower layer from the first cavity of the upper layer along the particle channel under the drive of the first electrode 10 and the second electrode 40. Since the color of the second color filter layer 36 is the same as the color of the first color filter layer 35, the part of the second color filter layer 36 not covered by the black charged particles 33 can supplement the area of ​​the particle channel, thereby improving the display effect.

[0061] Furthermore, the area of ​​the second color filter layer 36 corresponding to the particle channel can also be set to a slope structure, so that the black charged particles 33 falling on the area of ​​the second color filter layer 36 corresponding to the particle channel can move along the slope structure and deviate from the bottom of the particle channel, ensuring that the area of ​​the second color filter layer 36 corresponding to the particle channel will not be blocked by the black charged particles 33, thereby improving the compensation display effect of the second color filter layer 36 on the particle channel.

[0062] Embodiment 3

[0063] refer to Figure 7In this embodiment, the first sub-pixel 31 includes a pixel sub-cavity 32, a first color filter layer 35 and black charged particles 33, and the pixel electrode includes a first electrode 10 and a second electrode 40. The arrangement of the first electrode 10, the pixel sub-cavity 32 and the second electrode 40 is referred to in the first embodiment. The first color filter layer 35 is a red color filter layer, and in other first sub-pixels 31, the first color filter layer 35 can also be a green or blue color filter layer, so that different first sub-pixels 31 display red, green or blue through different first color filter layers 35.

[0064] The difference from the above embodiment lies in the location of the particle channel and the upper surface structure of the first color filter layer 35 . Figure 7 In the illustrated embodiment, the particle channel may be strip-shaped and disposed on one side or both sides between the first color filter layer 35 and the pixel subcavity 32, that is, the width of the first color filter layer 35 is smaller than the width of the pixel subcavity 32, so that the particle channel is formed on at least one side between the first color filter layer 35 and the pixel subcavity 32. The upper surface of the first color filter layer 35 is configured to extend obliquely downward from a side away from the particle channel to a side close to the particle channel.

[0065] In this way, when the first sub-pixel 31 needs to be displayed as black, the driving circuit controls the first electrode 10 and the second electrode 40 to be energized and generate a preset electric field, and the black charged particles 33 enter the first cavity from the second cavity along the particle channel. After entering the first cavity, the black charged particles 33 can climb along the upper surface of the first color filter layer 35, that is, the inclined surface, so that the black charged particles 33 move more evenly above the upper surface of the first color filter layer 35, fully shielding the first color filter layer 35, avoiding the first sub-pixel 31 from generating mixed colors, causing interference to the display of adjacent first sub-pixels 31, and helping to improve and enhance the display effect.

[0066] When the first sub-pixel 31 needs to display with the help of the first color filter layer 35, the driving circuit controls the first electrode 10 and the second electrode 40 to generate an electric field opposite to the above-mentioned preset electric field, and the black charged particles 33 enter the second cavity from the first cavity along the particle channel. In this process, after the black charged particles 33 located above the upper surface of the first color filter layer 35 contact the upper surface of the first color filter layer 35, they roll down along the inclined surface of the upper surface of the first color filter layer 35 and gather on one side of the particle channel, thereby ensuring that all the black charged particles 33 in the first cavity enter the second cavity, avoiding that some black charged particles 33 remain in the first cavity to block the first color filter layer 35, affecting the display of the first sub-pixel 31, and helping to improve and enhance the display effect.

[0067] Embodiment 4

[0068] refer to Figure 8In this embodiment, the first sub-pixel 31 includes a pixel sub-cavity 32, a first color filter layer 35 and black charged particles 33. The structure of the first color filter layer 35 and the arrangement of the pixel electrode are different from those in the above embodiment. The pixel electrode includes a pair of first vertical electrodes 50 and a second vertical electrode 60. The upper surface of the first color filter layer 35 adopts an inclined surface extending downward from the center to both sides, so that a collection area for the black charged particles 33 to collect is formed in the area where the pixel sub-cavity 32 is located on both sides of the first color filter layer 35. The pair of first vertical electrodes 50 are respectively arranged on both sides of the pixel sub-cavity 32, and the second vertical electrode 60 is embedded in the central area of ​​the first color filter layer 35. The first vertical electrode 50 and the second vertical electrode 60 are arranged parallel to each other and parallel to the depth direction of the pixel sub-cavity 32.

[0069] When the driving circuit controls the first vertical electrode 50 and the second vertical electrode 60 to switch to the first power-on state, a preset electric field is generated between the second vertical electrode 60 and the first vertical electrodes 50 on both sides thereof. The first vertical electrode 50 carries a charge with an opposite charge to the black charged particles 33, and can adsorb the black charged particles 33 to move them away from the upper surface of the first color filter layer 35 and converge them toward the collection area, so that the first sub-pixel 31 can be displayed with the help of the first color filter layer 35.

[0070] When the driving circuit controls the first vertical electrode 50 and the second vertical electrode 60 to switch to the second power-on state, an electric field opposite to the above-mentioned preset electric field direction is generated between the second vertical electrode 60 and the first vertical electrodes 50 on both sides thereof, and the second vertical electrode 60 carries charges with opposite electrical properties to the black charged particles 33, so that the black charged particles 33 move from the collection area to the upper surface of the first color filter layer 35, that is, the inclined surfaces on both sides of the second vertical electrode 60, to block the first color filter layer 35, so that the first sub-pixel 31 is displayed as black.

[0071] The longitudinal section of the first color filter layer 35 can be specifically configured as an isosceles triangle, so that the first color filter layer 35 has a symmetrical structure as a whole, so that the black charged particles 33 are relatively evenly attached to the inclined surfaces on both sides of the second vertical electrode 60 .

[0072] Embodiment 5

[0073] refer to Fig. 9The first sub-pixel 31 includes a pixel sub-cavity 32, a first color filter layer 35 and black charged particles 33. The upper surface of the first color filter layer 35 is set as an inclined surface extending downward from both sides to the center. A pair of inclined surfaces are arranged opposite to each other, and the middle connection area of ​​the pair of opposite inclined surfaces forms a collection area for the black charged particles 33 to collect. The pixel electrode includes an inclined surface electrode 70 arranged in contact with the upper surface (inclined surface) of the first color filter layer 35. The inclined surface electrode 70 is a transparent electrode. The incident light entering the pixel sub-cavity 32 can pass through the inclined surface electrode 70 to irradiate the upper surface of the first color filter layer 35, and the light reflected by the upper surface of the first color filter layer 35 can also pass through the inclined surface electrode 70 to emit out of the pixel sub-cavity 32.

[0074] When charges with opposite electrical properties to those carried by the black charged particles 33 are passed through the inclined electrode 70, the black charged particles 33 can be attracted to move toward the inclined electrode 70, and then uniformly attached to the upper surface of the first color filter layer 35 to shield the first color filter layer 35. When the inclined electrode 70 is powered off, the black charged particles 33 can be gathered to the gathering area along the inclined surface, and the upper surface of the first color filter layer 35 is no longer shielded by the black charged particles 33, so that the first sub-pixel 31 can reflect the incident light by the first color filter layer 35 and display the same color as the first color filter layer 35.

[0075] In order to facilitate the black charged particles 33 to gather toward the collection area in the center of the upper surface of the first color filter layer 35, the pixel electrode also includes a collection electrode 80 arranged below the first color filter layer 35. The collection electrode 80 is preferably arranged at the bottom of the pixel subcavity 32 and corresponding to the collection area. In the black display state, the bevel electrode 70 is powered on to adsorb the black charged particles 33, and the collection electrode 80 is powered off. In the color display state, the bevel electrode 70 is powered off, and the collection electrode 80 is powered on to adsorb the black charged particles 33 and collect them toward the collection area.

[0076] In the above embodiment, in order to increase the incident and reflected light and improve the display brightness, the electronic paper display panel also includes a reflector 90 arranged on the top of the pixel sub-cavity 32. The reflector 90 is arranged corresponding to the collection area of ​​the black charged particles 33, that is, the reflector 90 is located directly above the collection area, and basically does not affect the effective display area of ​​the first color filter layer 35. When the black charged particles 33 are separated from the upper surface of the first color filter layer 35, the reflector 90 can reflect the light irradiated to the surface of the reflector 90 to the upper surface of the first color filter layer 35, increase the amount of light entering the pixel sub-cavity 32, and then improve the display brightness of the first sub-pixel 31 in the color display state, and improve the display effect.

[0077] Combined with reference Figures 1 to 4The pixel layer includes sub-pixel units 20 that are regular hexagonal and arranged in an array. Each sub-pixel unit 20 includes three sub-pixel regions 30. The three sub-pixel regions 30 each include a plurality of first sub-pixels 31 as in the above embodiment. The first sub-pixels 31 of each sub-pixel region 30 use a first color filter layer 35 of the same color. The first sub-pixels 31 of the three sub-pixel regions 30 include red, green and blue first color filter layers 35, respectively. That is, the three sub-pixel regions 30 are used to display red, green and blue, respectively. By controlling different sub-pixel regions 30 for display, the sub-pixel unit 20 can display red, green and blue, respectively.

[0078] like Figure 1 As shown, the three sub-pixel regions 30 are set to be equal in size and diamond in shape. In order to ensure and improve color fusion and display effects, the first sub-pixel 31 of each sub-pixel region 30 includes an inner layer sub-pixel close to the central area of ​​the sub-pixel unit 20 and an outer layer sub-pixel close to the outer peripheral area of ​​the sub-pixel unit 20. The inner layer sub-pixel and the outer layer sub-pixel can be displayed separately, and the inner layer sub-pixel can be preferentially controlled for display during display. The inner layer sub-pixel of each sub-pixel region 30 can be set to two, and the inner layer sub-pixel presents an isosceles triangle. The outer layer sub-pixel of each sub-pixel region 30 is set to two, and the outer layer sub-pixel presents an isosceles trapezoid. The six inner layer sub-pixels of the three groups of sub-pixel regions 30 of each sub-pixel unit 20 are spliced ​​to form an inner regular hexagon, and the six outer layer sub-pixels of the three groups of sub-pixel regions 30 are connected to the outer periphery of the inner regular hexagon, and cooperate with the inner regular hexagon to form a regular hexagonal sub-pixel unit 20.

[0079] Figure 1 In the embodiment, the three sub-pixel regions 30 of the sub-pixel unit 20 are arranged in the form of R4G4B4, that is, red 4, green 4, and blue 4. That is, each sub-pixel region 30 has 4 color levels, so each sub-pixel unit 20 has 4*4*4=64 colors.

[0080] Figure 2 In the illustrated embodiment, the sub-pixel unit 20 is also composed of three groups of sub-pixel regions 30, and the sub-pixel region 30 is composed of inner sub-pixels and outer sub-pixels. The difference is that some outer sub-pixels are replaced by black sub-pixels. Exemplarily, the sub-pixel unit 20 as a whole adopts the arrangement of R3G4B2, that is, red 3, green 4, and blue 2, and the remaining 3 groups of outer sub-pixels can be replaced by black pixel units. In this way, by adjusting the color and number of the first sub-pixel 31 of the sub-pixel region 30, different color level combinations of the sub-pixel unit 20 are achieved, the color fusion effect of the sub-pixel unit 20 is improved, and the display effect of the electronic paper display panel is thereby enhanced.

[0081] like Figure 3As shown, the colors of adjacent sub-pixel regions 30 of adjacent sub-pixel units 20 of the pixel layer are different, so that the adjacent joints of the three sub-pixel units 20 include sub-pixel regions 30 of RGB, i.e., red, green and blue, respectively, thereby promoting color fusion and improving display effects.

[0082] The embodiment of the present application also provides a display device, which uses the electronic paper display panel provided by the above embodiment. The display device can specifically be an electronic reader, etc. Other parts of the display device can refer to the existing technology.

[0083] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0084] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0085] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. An electronic paper display panel, characterized in that: The device comprises a pixel layer and a driving circuit for controlling display of the pixel layer, wherein the pixel layer comprises first sub-pixels arranged in an array, and the driving circuit comprises pixel electrodes arranged corresponding to the first sub-pixels; the first sub-pixels comprise: pixel sub-cavity; A first color filter layer, disposed in the pixel sub-cavity, the first color filter layer being red, green or blue; Black charged particles are filled in the pixel sub-cavity and are configured to move toward or away from the top of the first color filter layer under the drive of the pixel electrode; when the black charged particles move to the top of the first color filter layer, the first color filter layer is blocked, and when the black charged particles move away from the top of the first color filter layer, the first color filter layer is exposed and the first sub-pixel displays a corresponding color.

2. The electronic paper display panel according to claim 1, characterized in that: The pixel electrode comprises a first electrode and a second electrode, wherein the first electrode and the second electrode are respectively arranged above and below the first color filter layer; The first color filter layer divides the pixel subcavity into a first cavity in an upper layer and a second cavity in a lower layer. The first color filter layer is provided with a particle channel connecting the first cavity and the second cavity and allowing the black charged particles to pass through.

3. The electronic paper display panel according to claim 2, characterized in that: A support member for supporting the first color filter layer is arranged in the pixel sub-cavity.

4. The electronic paper display panel according to claim 2, characterized in that: A second color filter layer is provided at the bottom of the pixel subcavity, and the second color filter layer has the same color as the first color filter layer; the second color filter layer is located below the first color filter layer, and the projection of the second color filter layer on the first color filter layer at least covers the particle channel.

5. The electronic paper display panel according to any one of claims 2 to 4, characterized in that: The upper surface of the first color filter layer is an inclined surface extending downwardly toward the particle channel.

6. The electronic paper display panel according to claim 1, characterized in that: The pixel electrode comprises a first vertical electrode disposed at both sides of the pixel sub-cavity, and a second vertical electrode disposed at the center of the pixel sub-cavity, wherein the first vertical electrode and the second vertical electrode are disposed parallel to each other; The upper surface of the first color filter layer is an inclined surface extending downward from the center to both sides thereof, and both sides of the upper surface of the first color filter layer form a collection area for collecting black charged particles, and the second vertical electrode is arranged in the center of the first color filter layer; The first vertical electrode is used to adsorb the black charged particles in a first power-on state, so that the black charged particles move away from the upper surface of the first color filter layer, and the second vertical electrode is used to adsorb the black charged particles in a second power-on state, so that the black charged particles adhere to the upper surface of the first color filter layer.

7. The electronic paper display panel according to claim 6, characterized in that: The longitudinal section of the first color filter layer is an isosceles triangle, and the second vertical electrode is located on a perpendicular bisector of the bottom surface of the first color filter layer.

8. The electronic paper display panel according to claim 1, characterized in that: The upper surface of the first color filter layer is configured as inclined surfaces extending downward from both sides toward the center and arranged opposite to each other. The center of the upper surface of the first color filter layer forms a gathering area for gathering black charged particles. The pixel electrode includes an inclined electrode arranged in contact with the upper surface of the first color filter layer.

9. The electronic paper display panel according to any one of claims 6 to 8, characterized in that: A reflector is provided on the top of the pixel sub-cavity, and the reflector is arranged corresponding to the collection area; when the black charged particles leave the upper surface of the first color filter layer and gather in the collection area, the reflector is used to reflect the light irradiated to the reflector to the upper surface of the first color filter layer.

10. A display device, characterized in that: An electronic paper display panel according to any one of claims 1 to 9 is used.

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