Electronic paper display panel and display device

Abstract

The application 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 the display of the pixel layer, the pixel layer comprises first sub-pixels arranged in an array, and the driving circuit comprises pixel electrodes arranged correspondingly to the first sub-pixels; the first sub-pixel comprises a pixel sub-cavity, a first color film layer and black charged particles; the first color film layer is arranged in the pixel sub-cavity, and the first color film layer is red, green or blue; the black charged particles are filled in the pixel sub-cavity and can move towards the upper side of the first color film layer or away from the upper side of the first color film layer under the drive of the pixel electrode; the black charged particles shield the first color film layer when moving to the upper side of the first pixel sub-cavity, and the black charged particles expose the first color film layer and make the first sub-pixel display the corresponding color when moving away from the upper side of the first color film layer. The above-mentioned electronic paper display panel can improve the display effect.

Description

TECHNICAL FIELD

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

[0002] Currently, electronic paper has been widely used. Common electronic paper on the market is black and white electronic paper, three-color electronic paper (black, white and red), and relatively less color electronic paper. Electronic paper has excellent performance such as low power consumption and long service life. Color electronic paper can display multiple colors without backlight, and has more extensive use than black and white electronic paper, and will have a wide application prospect in the future display market. However, the display effect of color electronic paper needs to be improved at present. SUMMARY

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

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

[0005] a pixel sub-cavity;

[0006] a first color film layer arranged in the pixel sub-cavity, wherein the first color film layer is red, green or blue;

[0007] black charged particles filled in the pixel sub-cavity and configured to move towards or away from the upper side of the first color film layer under the drive of the pixel electrode; when the black charged particles move to the upper side of the first color film layer, the first color film layer is shielded, and when the black charged particles move away from the upper side of the first color film layer, the first color film layer is exposed and the first sub-pixel displays the corresponding color.

[0008] In some embodiments, the pixel electrode comprises a first electrode and a second electrode, and the first electrode and the second electrode are arranged above and below the first color film layer, respectively.

[0009] The first color film layer divides the pixel sub-cavity into a first cavity in the upper layer and a second cavity in the lower layer, and the first color film layer is provided with a particle channel for the black charged particles to pass through and communicate the first cavity and the second cavity.

[0010] In some embodiments, the pixel sub-cavity is provided with a support member for supporting the first color film layer.

[0011] In some embodiments, the bottom of the pixel sub-cavity is provided with a second color film layer, the color of the second color film layer is the same as that of the first color film layer; the second color film layer is located below the first color film layer, and the projection of the second color film layer on the first color film layer covers at least the particle channel.

[0012] In some embodiments, the upper surface of the first color film layer is a downwardly inclined slope extending from the center to the two sides.

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

[0014] The upper surface of the first color film layer is a downwardly inclined slope extending from the center to the two sides, the two sides of the upper surface of the first color film layer form a collection area for the black charged particles to collect, and the second vertical electrode is arranged at the center of the first color film layer.

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

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

[0017] In some embodiments, the upper surface of the first color film layer is arranged as two oppositely arranged downwardly inclined slopes extending from the two sides to the center, the center of the upper surface of the first color film layer forms a collection area for the black charged particles to collect, and the pixel electrode is arranged in close contact with the upper surface of the first color film layer.

[0018] In some embodiments, the top of the pixel sub-cavity is provided with a reflecting member, the reflecting member is arranged corresponding to the collection area; when the black charged particles move away from the upper surface of the first color film layer and collect in the collection area, the reflecting member is used to reflect the light irradiated to the reflecting member to the upper surface of the first color film layer.

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

[0020] Compared with the prior art, the above technical solution provided by the embodiment of the present application has the following advantages: different electric fields are generated by the pixel electrode of the driving circuit, so that the black charged particles in the pixel sub-cavity move; when the pixel electrode generates a first electric field to drive the black charged particles to move towards the upper side of the first color filter layer, the black charged particles shield 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 upper side of the first color filter layer, the first color filter layer is exposed, so that the first sub-pixel displays a color same as the color of the first color filter layer in the pixel sub-cavity thereof.

[0021] By controlling the movement of the black charged particles driven by the pixel electrode to switch the display state, the response speed of the electronic paper display panel is ensured; different first sub-pixels reflect incident light through the first color filter layer of the corresponding color to display red, green and blue, and compared with the floating display of red, green and blue charged particles, the uniformity and stability of the display are better, which helps to improve the display effect. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings incorporated into the specification and constituting a part of the specification show embodiments consistent with the present application and, together with the specification, serve to explain the principles of the present application.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows, and obviously, other drawings can also be obtained by those skilled in the art without creative labor under the premise of not paying any creative labor.

[0024] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings, and these exemplary illustrations do not constitute a limitation on the embodiments, and the elements with the same reference numerals in the drawings represent similar elements, unless otherwise specified, and the drawings do not constitute a proportional limitation.

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

[0026] Figure 2 Another pixel arrangement schematic diagram of a first sub-pixel in a sub-pixel unit of an electronic paper display panel provided by the embodiment of the present application is shown in FIG. 2;

[0027] Figure 3 A pixel arrangement schematic diagram of a sub-pixel unit of an electronic paper display panel is shown in FIG. 3; Figure 1 A pixel arrangement schematic diagram of a sub-pixel unit of an electronic paper display panel is shown in FIG. 3;

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

[0029] Figure 5 A plan view of the first sub-pixel provided for the first embodiment of the present application;

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

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

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

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

[0034] BRIEF DESCRIPTION OF DRAWINGS

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

[0036] In order to make the objects, technical solutions, and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0037] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplicity, the components and arrangements of the various examples are described in the following detailed description. These are, of course, merely examples and are not intended to limit the application from that described. Furthermore, the application can be implemented in a wide variety of environments and contexts. Consequently, specific examples are not described in order to simplify the present application. In addition, reference numerals and / or letters can be repeated in different examples. Such repetition is for the purpose of simplicity and clarity and does not indicate a relationship between the various embodiments and / or arrangements discussed.

[0038] For ease of description, spatial relative terms can be used herein to describe the positional relationship or movement of one element or feature relative to another element or feature as shown in the drawings, such as "inner", "outer", "inward", "outward", "lower", "below", "upper", "above", "front", "back", and the like. 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 drawings. For example, if the device in the drawings is turned over or reversed, or the device is moved or rotated, the indication of the direction as "below" or "under" another element or feature will be correspondingly changed to "above" or "over" the other element or feature. Therefore, the example term "below" can include both upward and downward orientations. The device can be additionally oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein are interpreted accordingly.

[0039] To solve the technical problem of poor display effect of the electronic paper display panel 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 "up", "down", "left" and "right" referred to in the present application are all with reference to the horizontal placement of the electronic paper display panel. 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 drawings and the following examples, "R" represents red, "G" represents green, and "B" represents blue.

[0040] The present application provides an electronic paper display panel, as shown in the drawings, Figures 1 to 4 The electronic paper display panel includes a display layer and a driving circuit for controlling the display of the display layer. The display layer includes a plurality of sub-pixel units 20 arranged in an array, and each sub-pixel unit 20 includes a plurality of sub-pixel regions 30 capable of displaying red, green and blue respectively. Each sub-pixel region 30 includes a plurality of first sub-pixels 31 capable of displaying the same color, and the driving circuit includes a pixel electrode corresponding to each first sub-pixel 31. The electronic paper display panel can display red, green or blue light by controlling the first sub-pixels 31 of a certain sub-pixel region 30 of the sub-pixel unit 20 to display, so that the sub-pixel unit 20 displays red, green or blue light; or the electronic paper display panel can 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 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 comprises a pixel sub-cavity 32, a first color film layer 35 arranged in the pixel sub-cavity 32, and black charged particles 33 filled in the pixel sub-cavity 32. The pixel electrode is used to generate a preset electric field, so as to drive the black charged particles 33 to move towards or away from the upper surface of the first color film layer 35. Different electric fields generated by the pixel electrode of the driving circuit make the black charged particles 33 in the pixel sub-cavity 32 move in the pixel sub-cavity 32, so as to control 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 towards the upper side of the first color film layer 35, the black charged particles 33 shield the first color film 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 upper side of the first color film layer 35, the first color film layer 35 is exposed, so that the first sub-pixel 31 displays the same color as the color of the first color film layer 35 in the pixel sub-cavity 32.

[0043] The display state is switched by controlling the pixel electrode to drive the black charged particles 33 to move, so as to ensure the response speed of the electronic paper display panel. Different first sub-pixels 31 respectively display red, green and blue by reflecting incident light through the first color film layer 35 of the corresponding color, which is better than the display using red, green and blue charged particles floating or by means of backlight display in uniformity and stability, and is helpful to improve the display effect. Moreover, the above-mentioned electronic paper display panel displays by reflecting 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 of driving the black charged particles 33 to move in the pixel sub-cavity 32 by the pixel electrode to realize the switching of the display state will be described below in combination with the drawings and specific embodiments.

[0045] Embodiment one

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

[0047] The first electrode 10 is a transparent electrode, and 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 divides the pixel sub-cavity 32 into a first cavity and a second cavity which are isolated from each other. The black charged particles 33 are filled in the pixel sub-cavity 32, and the first color filter layer 35 can be arrayed with a plurality of particle channels which connect the first cavity and the second cavity, and the size of the particle channels is greater 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 channels. The pixel sub-cavity 32 is filled with a transmittance-increasing liquid, which can achieve the effect of increasing transmittance and facilitate electrophoresis of the black charged particles 33 to improve the response speed.

[0048] For example, the black charged particles 33 can be negatively charged. When the first electrode 10 is connected to the positive pole of the driving circuit and the second electrode 40 is connected to the negative pole 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 move from the lower second cavity to the upper first cavity through the particle channels, so that the black charged particles 33 move to the upper side of the first color filter layer 35 to shield the first color filter layer 35. At this time, the light incident on the pixel sub-cavity 32 is absorbed by the black charged particles 33 and cannot be irradiated to the first color filter layer 35 to realize reflective display.

[0049] When the first electrode 10 is connected to the negative pole of the driving circuit and the second electrode 40 is connected to the positive pole 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 move from the upper first cavity to the lower second cavity through the particle channels, and the black charged particles 33 no longer shield 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, and the light with a color different from that of the first color filter layer 35 is absorbed, and the light with the same color as that of 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, that is, red, green or blue.

[0050] In the above embodiment, by controlling the power supply of the first electrode 10 and the second electrode 40 respectively, a preset electric field is generated between the first electrode 10 and the second electrode 40, and the black charged particles 33 are driven to move towards and away from the upper side of the first color filter layer 35 by the preset electric field, so as to control the first sub-pixel 31 to switch between the black state and the color state of the reflective display of the first color filter layer 35.

[0051] In a specific implementation, the black charged particles 33 can also be positively charged, and the energized 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 sub-cavity 32 can also be filled with transparent charged particles 34 having an opposite charge polarity to the black charged particles 33, and the transparent charged particles 34 can be spherical. When the black charged particles 33 move to the lower second cavity under the action of the electric field between the first electrode 10 and the second electrode 40, the transparent charged particles 34 move to the upper first cavity through the particle channel. Since the spherical transparent particles can act as a lens and can refract more ambient light, more light can be irradiated to the upper surface of the first color film layer 35, and more light can be reflected into the human eye, that is, the visibility and brightness can be increased.

[0052] The particle channel of the first color film layer 35 can be distributed in a grid shape according to the structure shown in the figure, and can also be opened at a set interval as needed. The opening of the particle channel can 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 film layer 35 is stably fixed at the middle position of the depth direction of the pixel sub-cavity 32, a support 37 can also be arranged in the pixel sub-cavity 32, and the support 37 is arranged below the first color film layer 35. The support 37 can improve the reliability of the fixation of the first color film layer 35. Specifically, the support 37 can be arranged on both sides or the periphery below the first color film layer 35, and the support 37 is arranged to avoid the particle channel of the first color film layer 35, so as not to affect 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, and the two are arranged in parallel and opposite to each other. The ITO thin film has the characteristics of high light transmittance, low resistivity, and good chemical stability. The ITO thin film mainly plays the roles of conducting and transmitting light in electronic devices, and is an important part of realizing 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 bottom outside the pixel sub-cavity 32, but also can be arranged in the pixel sub-cavity 32 as needed. As long as the first electrode 10 and the second electrode 40 are respectively located above and below the first color film layer 35 and are respectively connected to different electrodes of the driving circuit.

[0056] Embodiment Two

[0057] Reference Figure 6, the first sub-pixel 31 comprises the pixel sub-cavity 32, the first color filter layer 35 and the black charged particles 33, and the pixel electrode comprises the first electrode 10 and the second electrode 40. The first color filter layer 35 separates the pixel sub-cavity 32 to form a first cavity in the upper layer and a second cavity in the lower layer, and the first cavity and the second cavity are communicated through the particle channel. The difference is that the first sub-pixel 31 provided in the embodiment further comprises a second color filter layer 36. The second color filter layer 36 and the first color filter layer 35 are of the same color and are 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 arranged only in the area corresponding to the particle channel, or can cover the entire cross section of the pixel sub-cavity 32, as long as the orthographic projection of the second color filter layer 36 on the first color filter layer 35 at least covers the particle channel, so as to display the particle channel area by means of the second color filter layer 36, and improve the display effect.

[0059] When the first sub-pixel 31 needs to be displayed as black, the black charged particles 33 are driven by the first electrode 10 and the second electrode 40 to enter the first cavity in the upper layer from the second cavity in the lower layer along the particle channel, that is, the black charged particles 33 move to the upper side of the first color filter layer 35, and shield the part 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 be displayed by means of the first color filter layer 35, the black charged particles 33 are driven by the first electrode 10 and the second electrode 40 to enter the second cavity in the lower layer from the first cavity in the upper layer along the particle channel. Since the color of the second color filter layer 36 is the same as that 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 display the area of the particle channel complementarily, thereby improving the display effect.

[0061] Further, the area of the second color filter layer 36 corresponding to the particle channel can also be arranged as 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 to deviate from directly below the particle channel, so as to ensure that the area of the second color filter layer 36 corresponding to the particle channel is not shielded by the black charged particles 33, and improve the compensation display effect of the second color filter layer 36 at the particle channel.

[0062] Embodiment three

[0063] Reference Figure 7In the embodiment, the first sub-pixel 31 comprises a pixel sub-cavity 32, a first color filter layer 35 and black charged particles 33, and the pixel electrode comprises a first electrode 10 and a second electrode 40. The first electrode 10, the pixel sub-cavity 32 and the second electrode 40 are arranged as in Embodiment One. 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.

[0064] The difference between the above embodiment and the present embodiment is the arrangement position of the particle channel and the upper surface structure of the first color filter layer 35. Figure 7 In the embodiment, the particle channel can be in a strip shape and arranged on one side or both sides between the first color filter layer 35 and the pixel sub-cavity 32, that is, the width of the first color filter layer 35 is smaller than the width of the pixel sub-cavity 32, so that the particle channel is formed on at least one side between the first color filter layer 35 and the pixel sub-cavity 32. The upper surface of the first color filter layer 35 is arranged to extend downwardly and obliquely from the side far away from the particle channel to the side close to the particle channel.

[0065] In this way, when the first sub-pixel 31 needs to display black, the driving circuit controls the first electrode 10 and the second electrode 40 to be electrified 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 uniformly above the upper surface of the first color filter layer 35, fully shield the first color filter layer 35, avoid the first sub-pixel 31 producing a mixed color, interfere with the display of the adjacent first sub-pixel 31, and help to improve and enhance the display effect.

[0066] When the first sub-pixel 31 needs to display through the first color filter layer 35, the driving circuit controls the first electrode 10 and the second electrode 40 to be electrified 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 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 and gather to one side of the particle channel along the inclined surface of the upper surface of the first color filter layer 35, thereby ensuring that all the black charged particles 33 in the first cavity enter the second cavity, avoiding that part of the black charged particles 33 remain in the first cavity to shield the first color filter layer 35 and affect the display of the first sub-pixel 31, and helping to improve and enhance the display effect.

[0067] Embodiment Four

[0068] Reference Figure 8In the embodiment, the first sub-pixel 31 comprises the pixel sub-cavity 32, the first color filter layer 35 and the black charged particles 33, and 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 comprises a pair of first vertical electrodes 50 and a second vertical electrode 60, and the upper surface of the first color filter layer 35 is inclined downward from the center to the two sides, so as to form a collection area for the black charged particles 33 in the area where the pixel sub-cavity 32 is located on the two sides of the first color filter layer 35. The pair of first vertical electrodes 50 are arranged on the two sides of the pixel sub-cavity 32 respectively, and the second vertical electrode 60 is embedded in the central area of the first color filter layer 35. The first vertical electrodes 50 and the second vertical electrode 60 are arranged in parallel with each other and parallel to the depth direction of the pixel sub-cavity 32.

[0069] When the driving circuit controls the first vertical electrodes 50 and the second vertical electrode 60 to switch to the first energized state, a preset electric field is generated between the second vertical electrode 60 and the first vertical electrodes 50 on the two sides thereof, and the first vertical electrodes 50 carry charges opposite in electric property to the black charged particles 33, so as to adsorb the black charged particles 33 away from the upper surface of the first color filter layer 35 and collect them towards the collection area, so that the first sub-pixel 31 can display by means of the first color filter layer 35.

[0070] When the driving circuit controls the first vertical electrodes 50 and the second vertical electrode 60 to switch to the second energized state, an electric field opposite in direction to the above-mentioned preset electric field is generated between the second vertical electrode 60 and the first vertical electrodes 50 on the two sides thereof, and the second vertical electrode 60 carries charges opposite in electric property 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, i.e. the inclined surfaces on the two sides of the second vertical electrode 60, and shield the first color filter layer 35, so that the first sub-pixel 31 displays black.

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

[0072] Embodiment Five

[0073] Reference Figure 9, the first sub-pixel 31 comprises 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 provided as a slope extending downward from both sides to the center, a pair of slopes are oppositely arranged, and the middle connection area of the pair of opposite slopes forms a collection area for the black charged particles 33. The pixel electrode comprises a slope electrode 70 arranged on the upper surface (slope) of the first color filter layer 35, the slope electrode 70 is a transparent electrode, the incident light entering the pixel sub-cavity 32 can pass through the slope 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 slope electrode 70 to exit the pixel sub-cavity 32.

[0074] When the slope electrode 70 is connected with a charge opposite to the charge of the black charged particles 33, the black charged particles 33 can move towards the slope electrode 70 and then uniformly adhere to the upper surface of the first color filter layer 35 to shield the first color filter layer 35. In the power-off state, the black charged particles 33 can be collected along the slope to the collection area, 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 display the same color as the first color filter layer 35 by reflecting the incident light through the first color filter layer 35.

[0075] In order to facilitate the black charged particles 33 to gather towards the collection area in the center of the upper surface of the first color filter layer 35, the pixel electrode further comprises a collection electrode 80 arranged below the first color filter layer 35, and the collection electrode 80 is preferably arranged at the bottom of the pixel sub-cavity 32 and corresponds to the collection area. In the black display state, the slope electrode 70 is powered to adsorb the black charged particles 33, and the collection electrode 80 is powered off. In the color display state, the slope electrode 70 is powered off, and the collection electrode 80 is powered on to adsorb the black charged particles 33 towards 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 further comprises a reflecting piece 90 arranged at the top of the pixel sub-cavity 32. The reflecting piece 90 is arranged corresponding to the collection area of the black charged particles 33, that is, the reflecting piece 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 reflecting piece 90 can reflect the light irradiating the surface of the reflecting piece 90 to the upper surface of the first color filter layer 35, thereby increasing the light entering the pixel sub-cavity 32 and improving the display brightness of the first sub-pixel 31 in the color display state and improving the display effect.

[0077] In combination with reference Figures 1 to 4, the pixel layer comprises sub-pixel units 20 arranged in a regular hexagon, each sub-pixel unit 20 comprises three sub-pixel regions 30, and each of the three sub-pixel regions 30 comprises a plurality of first sub-pixels 31 as in the above embodiment. The first sub-pixels 31 of each sub-pixel region 30 adopt the same color first color film layer 35, and the first sub-pixels 31 of the three sub-pixel regions 30 respectively comprise red, green and blue first color film layers 35, that is, the three sub-pixel regions 30 are respectively used to display red, green and blue, and the display of different sub-pixel regions 30 is controlled to enable the sub-pixel unit 20 to display red, green and blue respectively.

[0078] As shown in Figure 1 , the three sub-pixel regions 30 are arranged in the form of equal size and same shape rhombus. To ensure and improve the color fusion and display effect, the first sub-pixels 31 of each sub-pixel region 30 comprise inner layer sub-pixels close to the central region of the sub-pixel unit 20 and outer layer sub-pixels close to the peripheral region of the sub-pixel unit 20. The inner layer sub-pixels and the outer layer sub-pixels can be displayed respectively, and the inner layer sub-pixels can be preferentially controlled to display during display. The inner layer sub-pixels of each sub-pixel region 30 can be arranged in two, and the inner layer sub-pixels present an isosceles triangle. The outer layer sub-pixels of each sub-pixel region 30 are arranged in two, and the outer layer sub-pixels present 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 layer 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 layer regular hexagon to form a regular hexagonal sub-pixel unit 20 together with the inner layer regular hexagon.

[0079] Figure 1 In the embodiment shown, the three sub-pixel regions 30 of the sub-pixel unit 20 adopt the arrangement 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 embodiment shown, the sub-pixel unit 20 is also composed of three groups of sub-pixel regions 30, and the sub-pixel regions 30 are spliced by inner layer sub-pixels and outer layer sub-pixels. The difference is that part of the outer layer sub-pixels are replaced by black sub-pixels. Exemplarily, the whole sub-pixel unit 20 adopts the arrangement form of R3G4B2, that is, red 3, green 4 and blue 2, and the remaining 3 groups of outer layer sub-pixels can be replaced by black pixel units. In this way, by adjusting the color and number of the first sub-pixels 31 of the sub-pixel region 30, different color level combinations of the sub-pixel unit 20 are realized, the color fusion effect of the sub-pixel unit 20 is improved, and the display effect of the electronic paper display panel is further improved.

[0081] As shown in Figure 3As shown, the colors of the adjacent sub-pixel regions 30 of the adjacent sub-pixel units 20 of the pixel layer are different, so that the adjacent junctions of the three sub-pixel units 20 each include sub-pixel regions 30 respectively in RGB, i.e., red, green and blue, thereby facilitating color blending and improving display effect.

[0082] The embodiment of the present application also provides a display device, which can be an electronic reader and the like and can apply the electronic paper display panel provided by the above embodiment. Other parts of the display device can refer to the prior art.

[0083] It should be understood that the terms used herein are for the purpose of describing particular example embodiments only and are not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and the like are to be construed to be inclusive (i.e., to include both instances of open- and closed- ended conditions) unless otherwise indicated with certainty by context. The methods described herein can be implemented by one or more computer programs or software modules that operate to perform the methods.

[0084] Although the terms first, second, third, etc. can be used herein to describe various 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 be only used to distinguish one element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms when used herein do not imply a sequence or order. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

[0085] The above description is merely that of the specific embodiments of the present application, making it possible for those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the present application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electronic paper display panel, characterized by, The display panel comprises a pixel layer and a driving circuit for controlling the display of the pixel layer, the pixel layer comprises a first sub-pixel arranged in an array, and the driving circuit comprises a pixel electrode arranged corresponding to the first sub-pixel; the first sub-pixel comprises: a pixel sub-cavity; a first color film layer arranged in the pixel sub-cavity, the first color film layer is red, green or blue; black charged particles filled in the pixel sub-cavity and configured to move towards or away from the upper side of the first color film layer under the driving of the pixel electrode; the black charged particles shield the first color film layer when moving to the upper side of the first color film layer, and the black charged particles expose the first color film layer and make the first sub-pixel display the corresponding color when moving away from the upper side of the first color film layer; the pixel electrode comprises a first electrode and a second electrode, the first electrode and the second electrode are arranged above and below the first color film layer respectively; the first color film layer divides the pixel sub-cavity into a first cavity in the upper layer and a second cavity in the lower layer, the first color film layer is provided with a particle channel for communicating the first cavity and the second cavity and passing the black charged particles; the bottom of the pixel sub-cavity is provided with a second color film layer, the color of the second color film layer is the same as that of the first color film layer; the second color film layer is located below the first color film layer, and the projection of the second color film layer on the first color film layer at least covers the particle channel.

2. The electronic paper display panel of claim 1, wherein, The pixel sub-cavity is provided with a support for supporting the first color film layer.

3. The electronic paper display panel according to claim 1 or 2, characterized in that, The upper surface of the first color film layer is an inclined surface extending downwardly and obliquely towards the particle channel.

4. An electronic paper display panel, characterized by, The display panel comprises a pixel layer and a driving circuit for controlling the display of the pixel layer, the pixel layer comprises a first sub-pixel arranged in an array, and the driving circuit comprises a pixel electrode arranged corresponding to the first sub-pixel; the first sub-pixel comprises: a pixel sub-cavity; a first color film layer arranged in the pixel sub-cavity, the first color film layer is red, green or blue; black charged particles filled in the pixel sub-cavity and configured to move towards or away from the upper side of the first color film layer under the driving of the pixel electrode; the black charged particles shield the first color film layer when moving to the upper side of the first color film layer, and the black charged particles expose the first color film layer and make the first sub-pixel display the corresponding color when moving away from the upper side of the first color film layer; the pixel electrode comprises a first vertical electrode arranged on both sides of the pixel sub-cavity and a second vertical electrode arranged in the center of the pixel sub-cavity, the first vertical electrode and the second vertical electrode are arranged in parallel with each other; the upper surface of the first color film layer is an inclined surface extending downwardly and obliquely from the center to both sides of the first color film layer, both sides of the upper surface of the first color film layer form a collection area for the black charged particles, and the second vertical electrode is arranged in the center of the first color film layer; The first vertical electrode is configured to adsorb the black charged particles in a first energized state, so as to move the black charged particles away from the upper surface of the first color film layer; and the second vertical electrode is configured to adsorb the black charged particles in a second energized state, so as to attach the black charged particles to the upper surface of the first color film layer.

5. The electronic paper display panel of claim 4, wherein, The first color film layer has a longitudinal cross section in the shape of an isosceles triangle, and the second vertical electrode is located on a vertical bisector plane of the bottom surface of the first color film layer.

6. An electronic paper display panel, characterized by, The display panel comprises a pixel layer and a driving circuit configured to control the display of the pixel layer, the pixel layer comprises a first sub-pixel arranged in an array, and the driving circuit comprises a pixel electrode arranged correspondingly to the first sub-pixel; the first sub-pixel comprises: a pixel sub-cavity; a first color film layer arranged in the pixel sub-cavity, the first color film layer being red, green or blue; black charged particles filled in the pixel sub-cavity and configured to move towards or away from the upper surface of the first color film layer under the drive of the pixel electrode; the black charged particles shield the first color film layer when moving to the upper surface of the first color film layer, and the black charged particles expose the first color film layer and make the first sub-pixel display a corresponding color when moving away from the upper surface of the first color film layer; the upper surface of the first color film layer is arranged as two oppositely arranged inclined surfaces extending downward from both sides to the center, the center of the upper surface of the first color film layer forms a collection area for the black charged particles, and the pixel electrode comprises an inclined electrode arranged on the upper surface of the first color film layer.

7. The electronic paper display panel of any of claims 4-6, wherein, The top of the pixel sub-cavity is provided with a reflecting member, and the reflecting member is arranged correspondingly to the collection area; when the black charged particles move away from the upper surface of the first color film layer and are collected to the collection area, the reflecting member is configured to reflect the light irradiated to the reflecting member to the upper surface of the first color film layer.

8. A display device, characterized by comprising: The electronic paper display panel of any one of claims 1-7 is applied.

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