阅读说明：本技术 显示面板及显示装置 (Display panel and display device ) 是由 钟德镇 余嘉洺 蔡志承 房耸 于 2020-12-08 设计创作，主要内容包括：本发明公开了一种显示面板及显示装置,显示面板包括第一基板、第二基板以及位于第一基板与第二基板之间的挡墙,挡墙将第一基板与第二基板之间的间隙间隔形成多个密闭的容置腔,显示面板具有多个像素单元,每个容置腔至少对应一个像素单元,容置腔内设有黑色带电粒子,黑色带电粒子能够在电场的作用下移动,第一基板上设有能够反射光线的像素电极以及设于像素电极周缘的第一公共电极,像素电极与像素单元相对应,第二基板上设有与像素电极和第一公共电极对应的第二公共电极。通过像素电极、第一公共电极以及第二公共电极来控制黑色带电粒子在容置腔内的分布位置,从而控制像素电极反射光线的强弱,以实现利用环境光的正常显示。(The invention discloses a display panel and a display device, wherein the display panel comprises a first substrate, a second substrate and a retaining wall positioned between the first substrate and the second substrate, the retaining wall enables a gap between the first substrate and the second substrate to form a plurality of closed containing cavities at intervals, the display panel is provided with a plurality of pixel units, each containing cavity at least corresponds to one pixel unit, black charged particles are arranged in the containing cavities and can move under the action of an electric field, a pixel electrode capable of reflecting light rays and a first common electrode arranged on the periphery of the pixel electrode are arranged on the first substrate, the pixel electrode corresponds to the pixel units, and a second common electrode corresponding to the pixel electrode and the first common electrode is arranged on the second substrate. The distribution position of the black charged particles in the accommodating cavity is controlled through the pixel electrode, the first common electrode and the second common electrode, so that the intensity of light reflected by the pixel electrode is controlled, and normal display by utilizing ambient light is realized.)

1. A display panel is characterized by comprising a first substrate (10), a second substrate (20) arranged opposite to the first substrate (10) and a retaining wall (30) positioned between the first substrate (10) and the second substrate (20), wherein the retaining wall (30) forms a plurality of closed accommodating cavities (31) at intervals in a gap between the first substrate (10) and the second substrate (20), the display panel is provided with a plurality of pixel units (SP), each accommodating cavity (31) at least corresponds to one pixel unit (SP), black charged particles (40) are arranged in each accommodating cavity (31), each black charged particle (40) can move under the action of an electric field, a pixel electrode (12) capable of reflecting light and a first common electrode (14) arranged on the periphery of the pixel electrode (12) are arranged on the first substrate (10), and the pixel electrode (12) corresponds to the pixel unit (SP), a second common electrode (23) corresponding to the pixel electrode (12) and the first common electrode (14) is provided on the second substrate (20).

2. The display panel according to claim 1, wherein the first substrate (10) is further provided with a microstructure protrusion (11), the pixel electrode (12) covers the microstructure protrusion (11), and the surface shape of the pixel electrode (12) facing the second substrate (20) is the same as the surface shape of the microstructure protrusion (11).

3. The display panel according to claim 2, wherein the cross-sectional shape of the microstructure protrusions (11) is semicircular, semi-elliptical, and triangular.

4. The display panel according to claim 1, wherein the first substrate (10) is further provided with a boss (13), and the first common electrode (14) is provided above the boss (13).

5. The display panel according to claim 4, wherein the first substrate (10) further comprises a scan line (1), a data line (2) and a thin film transistor (3), and the pixel electrode (12) is electrically connected to the scan line (1) and the data line (2) adjacent to the thin film transistor (3) through the thin film transistor (3).

6. The display panel according to claim 5, wherein the scan lines (1), the data lines (2) and the TFTs (3) are disposed above the mesas (13); or the boss (13) is arranged above the scanning line (1), the data line (2) and the thin film transistor (3).

7. The display panel according to claim 1, wherein the first common electrode (14) is provided with electrode stripes (142), the electrode stripes (142) being located within the pixel cells (SP) and being arranged laterally or/and longitudinally.

8. The display device according to claim 1, wherein the second substrate (20) is provided with a black matrix (21) and a color resist layer (22), the black matrix (21) corresponding to the first common electrode (14), the black matrix (21) spacing a plurality of the color resist layers (22), each of the color resist layers (22) corresponding to one of the pixel units (SP); or the second substrate (20) is provided with a black matrix (21), the black matrix (21) corresponds to the first common electrode (14), and the second substrate (20) is in a transparent state in a region corresponding to the pixel unit (SP).

9. The display panel according to claim 1, wherein the first substrate (10) is further provided with a first insulating layer (15) covering the pixel electrode (12) and the first common electrode (14), and the second substrate (20) is further provided with a second insulating layer (24) covering the second common electrode (23).

10. A display device characterized by comprising the display panel according to any one of claims 1 to 9.

Technical Field

The present invention relates to the field of display technologies, and in particular, to a display panel and a display device.

Background

The display panel has the advantages of lightness, thinness, durability, low power consumption and the like which accord with energy conservation and environmental protection, but the backlight source is needed to be matched, so that the module is thick and the cost is high. The electronic paper display is a display meeting public needs, and can display images by using an external light source, unlike a liquid crystal display which needs a backlight source, so that information on electronic paper can still be clearly seen in an outdoor environment with strong sunlight without the problem of viewing angle, and the electronic paper display is widely applied to electronic readers (such as electronic books and electronic newspapers) or other electronic elements (such as price tags) due to the advantages of power saving, high reflectivity, contrast ratio and the like.

The electronic paper display displays images by reflecting an external light source, and the conventional electronic paper display usually needs to be matched with a polarizer, which has more light loss, and when the external light source is weaker, the brightness of the electronic paper display is lower.

Disclosure of Invention

In order to overcome the disadvantages and shortcomings of the prior art, an object of the present invention is to provide a display panel and a display device, so as to solve the problem of display brightness reduction caused by the need of using a polarizer in the prior art.

The purpose of the invention is realized by the following technical scheme:

the invention provides a display panel, which comprises a first substrate, a second substrate arranged opposite to the first substrate and a retaining wall positioned between the first substrate and the second substrate, wherein the retaining wall enables a gap between the first substrate and the second substrate to form a plurality of closed accommodating cavities at intervals, the display panel is provided with a plurality of pixel units, each accommodating cavity at least corresponds to one pixel unit, black charged particles are arranged in the accommodating cavities and can move under the action of an electric field, a pixel electrode capable of reflecting light and a first common electrode arranged at the periphery of the pixel electrode are arranged on the first substrate, the pixel electrode corresponds to the pixel unit, and a second common electrode corresponding to the pixel electrode and the first common electrode is arranged on the second substrate.

Furthermore, the first substrate is also provided with a microstructure protrusion, the pixel electrode covers above the microstructure protrusion, and the shape of the surface of the pixel electrode facing the second substrate is the same as that of the surface of the microstructure protrusion.

Further, the cross-sectional shape of the microstructure protrusion is semicircular, semielliptical and triangular.

Furthermore, the first substrate is further provided with a boss, and the first common electrode is arranged above the boss.

Furthermore, the first substrate is further provided with a scanning line, a data line and a thin film transistor, and the pixel electrode is electrically connected with the scanning line and the data line adjacent to the thin film transistor through the thin film transistor.

Furthermore, the scanning line, the data line and the thin film transistor are all arranged above the boss; or the boss is arranged above the scanning line, the data line and the thin film transistor.

Further, the first common electrode is provided with electrode stripes which are located in the pixel unit and arranged laterally or/and longitudinally.

Furthermore, the second substrate is provided with a black matrix and a color resistance layer, the black matrix corresponds to the first common electrode, the black matrix separates a plurality of color resistance layers, and each color resistance layer corresponds to one pixel unit; or the second substrate is provided with a black matrix corresponding to the first common electrode, and the second substrate is in a transparent state in a region corresponding to the pixel unit.

Further, the first substrate is further provided with a first insulating layer covering the pixel electrode and the first common electrode, and the second substrate is further provided with a second insulating layer covering the second common electrode.

The invention also provides a display device comprising the display panel.

The invention has the beneficial effects that: the display panel comprises a first substrate, a second substrate and a retaining wall, wherein the second substrate is arranged opposite to the first substrate, the retaining wall is positioned between the first substrate and the second substrate, the retaining wall enables a gap between the first substrate and the second substrate to form a plurality of closed containing cavities at intervals, the display panel is provided with a plurality of pixel units, each containing cavity at least corresponds to one pixel unit, black charged particles are arranged in the containing cavities and can move under the action of an electric field, a pixel electrode capable of reflecting light rays and a first common electrode arranged on the periphery of the pixel electrode are arranged on the first substrate, the pixel electrode corresponds to the pixel units, and a second common electrode corresponding to the pixel electrode and the first common electrode is arranged on the second substrate. The distribution position of the black charged particles in the accommodating cavity is controlled through the pixel electrode, the first common electrode and the second common electrode, so that the intensity of light reflected by the pixel electrode is controlled, normal display by utilizing ambient light is realized, a backlight source and a polaroid are not required to be arranged, and the liquid crystal display is light, thin, portable, energy-saving, environment-friendly and low in cost.

Drawings

FIG. 1 is a schematic cross-sectional view illustrating a display panel in an initial state according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view illustrating a display panel in a display state according to an embodiment of the present invention;

FIG. 3 is a schematic plan view illustrating a first substrate according to one embodiment of the present invention;

fig. 4 is a schematic plan view of a first common electrode according to a first embodiment of the present invention;

FIG. 5 is a schematic plan view of a retaining wall according to an embodiment of the present invention;

fig. 6 is a schematic plan view of the first common electrode according to the second embodiment of the present invention;

FIG. 7 is a schematic cross-sectional view of a display panel in an initial state according to a third embodiment of the present invention;

fig. 8 is a schematic plan view of a first substrate according to a fourth embodiment of the invention.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of the display panel and the display device according to the present invention with reference to the accompanying drawings and the preferred embodiments is as follows:

[ example one ]

Fig. 1 is a schematic structural diagram of a display panel in an initial state according to a first embodiment of the present invention, fig. 2 is a schematic structural diagram of a display panel in a display state according to a first embodiment of the present invention, fig. 3 is a schematic plan structural diagram of a first substrate according to a first embodiment of the present invention, fig. 4 is a schematic plan structural diagram of a first common electrode according to a first embodiment of the present invention, and fig. 5 is a schematic plan structural diagram of a bank according to a first embodiment of the present invention.

As shown in fig. 1 to fig. 5, a display panel according to a first embodiment of the present invention includes a first substrate 10, a second substrate 20 disposed opposite to the first substrate 10, and a retaining wall 30 disposed between the first substrate 10 and the second substrate 20, wherein the retaining wall 30 forms a plurality of closed accommodating cavities 31 at intervals between the first substrate 10 and the second substrate 20, the display panel has a plurality of pixel units SP, each accommodating cavity 31 corresponds to at least one pixel unit SP, black charged particles 40 are disposed in the accommodating cavity 31, and the black charged particles 40 can move under the action of an electric field. The first substrate 10 is provided with a pixel electrode 12 capable of reflecting light and a first common electrode 14 disposed on a periphery of the pixel electrode 12, the pixel electrode 12 corresponds to the pixel unit SP, and the second substrate 20 is provided with a second common electrode 23 corresponding to the pixel electrode 12 and the first common electrode 14. In this embodiment, the retaining wall 30 supports the first substrate 10 and the second substrate 20, and a plurality of closed accommodating cavities 31 are formed at intervals between the first substrate 10 and the second substrate 20, wherein each accommodating cavity 31 corresponds to one pixel unit SP. In other embodiments, each accommodating cavity 31 may correspond to two or three pixel units SP, that is, two or three pixel electrodes 12 are disposed in each accommodating cavity 31.

In this embodiment, the first substrate 10 is an array substrate, and the second substrate 20 is a color filter substrate. The first substrate 10 is provided with a scan line 1, a data line 2 and a thin film transistor 3, and the pixel electrode 12 is electrically connected to the scan line 1 and the data line 2 of the adjacent thin film transistor 3 through the thin film transistor 3. The thin film transistor 3 includes a gate electrode, an active layer, a drain electrode and a source electrode, the gate electrode and the scan line 1 are located in the same layer and electrically connected, the gate electrode and the active layer are isolated by a gate insulating layer, the source electrode is electrically connected to the data line 2, and the drain electrode is electrically connected to the pixel electrode 12. The second substrate 20 is provided with a black matrix 21 and a color resistance layer 22, the black matrix 21 corresponds to the first common electrode 14, the black matrix 21 separates the color resistance layers 22, each color resistance layer 22 corresponds to one pixel unit SP, and the color resistance layer 22 includes color resistance materials of three colors of red (R), green (G), and blue (B), and correspondingly forms the pixel units SP of the three colors of red (R), green (G), and blue (B). Of course, in other embodiments, the second substrate 20 is provided with the black matrix 21, the black matrix 21 corresponds to the position of the first common electrode 14, and the second substrate 20 is in a transparent state without the color resist layer 22 in the region corresponding to the pixel unit SP.

In this embodiment, the pixel electrode 12 is a block electrode corresponding to the pixel unit SP, the first common electrode 14 is a stripe electrode which is staggered horizontally and vertically, and the second common electrode 23 is a planar electrode which is entirely covered on the second substrate 20. The pixel electrode 12 is a reflective electrode such as aluminum (Al) or silver (Ag) that reflects light, but it is needless to say that molybdenum (Mo) may be coated on at least one of the upper and lower sides of aluminum (Al) or silver (Ag) in order to increase the connection strength between aluminum (Al) or silver (Ag) and other layers. The first common electrode 14 may be a transparent electrode (e.g., Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), or the like), or the first common electrode 14 may be an opaque electrode (e.g., molybdenum (Mo)). The second common electrode 23 is a transparent electrode (e.g., Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO)).

Further, the first substrate 10 is further provided with a microstructure protrusion 11, the pixel electrode 12 covers above the microstructure protrusion 11, and the shape of the surface of the pixel electrode 12 facing the second substrate 20 is the same as the shape of the surface of the microstructure protrusion 11, so that the pixel electrode 12 realizes diffuse reflection. The cross-sectional shape of the microstructure protrusions 11 is semicircular, semielliptical, or triangular. In other embodiments, the microstructure protrusions 11 may not be disposed below the pixel electrode 12, and the surface of the pixel electrode 12 facing the second substrate 20 may be frosted to make the surface of the pixel electrode 12 facing the second substrate 20 a rough plane, so as to implement diffuse reflection.

Further, the first substrate 10 is further provided with a boss 13, and the first common electrode 14 is disposed above the boss 13. In this embodiment, the scan line 1, the data line 2 and the thin film transistor 3 are all disposed above the boss 13.

Further, the first substrate 10 is further provided with a first insulating layer 15 covering the pixel electrode 12 and the first common electrode 14, and the second substrate 20 is further provided with a second insulating layer 24 covering the second common electrode 23.

Specifically, in this embodiment, the microstructure protrusion 11 and the boss 13 are first fabricated on the first substrate 10, the microstructure protrusion 11 and the boss 13 are fabricated from a thin film of the same OC material, then the scan line 1 and the gate electrode are fabricated on the boss 13, the gate insulating layer covering the scan line 1 and the gate electrode is fabricated on the first substrate 10, the active layer is fabricated above the corresponding gate electrode, and then the molybdenum layer and the aluminum layer are covered, the molybdenum layer and the aluminum layer are etched to form the data line 2, the drain electrode, the source electrode and the pixel electrode 12, so that it is not necessary to fabricate a contact hole at the drain electrode, then the insulating layer covering the data line 2, the drain electrode, the source electrode and the pixel electrode 12 is fabricated, the first common electrode 14 is fabricated on the insulating layer, and finally the first insulating layer 15 covering the first common electrode 14 and the pixel electrode 12 is fabricated. Of course, the manufacturing sequence can be adjusted according to the actual situation, and is not limited to this.

In the present embodiment, the first common electrode 14 and the pixel electrode 12 have a partial overlap to form a storage capacitance between the first common electrode 14 and the pixel electrode 12.

Further, the first common electrode 14 is provided with a conductive portion 141, the conductive portion 141 extends to the bonding region of the display panel, and the first common electrode 14 inputs an electrical signal through the conductive portion 141.

The black charged particles 40 may be positively or negatively charged, and are not limited thereto. The material of the black charged particles 40 is not limited, and may be, for example, a black resin doped with charged particles. As shown in fig. 2, taking the positively charged black charged particles 40 as an example, in a white state (a green sub-pixel in fig. 2), the first common electrode 14 applies a first common voltage (e.g. 4V), the second common electrode 23 applies a second common voltage (e.g. 3V), the pixel electrode 12 applies a highest gray scale voltage (e.g. 3V), and the voltage applied on the first common electrode 14 is the highest, the direction of the formed electric field is directed from the first common electrode 14 to the second common electrode 23 and the pixel electrode 12, respectively, the black charged particles 40 move toward the first common electrode 14 and are collected near the first common electrode 14, i.e. the black charged particles 40 are collected toward the periphery of the pixel unit SP, the middle of the pixel unit SP is in a transparent state, the pixel electrode 12 can reflect all external ambient light, and the corresponding sub-pixel is in a white state. In the black state (blue sub-pixel in fig. 2), the first common electrode 14 applies a first common voltage (e.g. 4V), the second common electrode 23 applies a second common voltage (e.g. 3V), the pixel electrode 12 applies a lowest gray scale voltage (e.g. 6V), and the voltage applied to the pixel electrode 12 is the highest, the direction of the formed electric field is directed to the first common electrode 14 and the second common electrode 23 by the pixel electrode 12, the black charged particles 40 move towards the pixel electrode 12 and are gathered near the pixel electrode 12, the black charged particles 40 block all external ambient light, the pixel electrode 12 cannot reflect the external ambient light, and the corresponding sub-pixel is in the black state. When other gray-scale states are displayed (red sub-pixel in fig. 2), the first common electrode 14 applies a first common voltage (e.g. 4V), the second common electrode 23 applies a second common voltage (e.g. 3V), the pixel electrode 12 applies a predetermined gray-scale voltage (e.g. between 3V and 6V), the charged black particles 40 are dispersed, and the pixel electrode 12 can reflect a portion of the external ambient light. When the charged black particles 40 are negatively charged, the principle is similar to that of the positively charged black particles 40, and the voltages applied to the first common electrode 14, the second common electrode 23, and the pixel electrode 12 can be adjusted according to practical situations, which is not described herein again.

[ example two ]

Fig. 6 is a schematic plan view of the first common electrode according to the second embodiment of the present invention. As shown in fig. 6, the display panel according to the second embodiment of the present invention has substantially the same structure as the display panel according to the first embodiment (fig. 1 to fig. 5), except that in the present embodiment, the first common electrode 14 is provided with the electrode strips 142, the electrode strips 142 are located in the pixel units SP and arranged horizontally or/and vertically for enhancing the electric field strength and increasing the response time, and the positions corresponding to the electrode strips 142 can reduce the reflection of light from the pixel electrodes 12, so as to reduce the reflection of light in the black state and improve the contrast. In this embodiment, two transverse electrode bars 142 are disposed in each pixel unit SP.

In this embodiment, the black matrix 21 may be added at the position of the second substrate 20 corresponding to the electrode strip 142, so as to further reduce the black-state reflection and improve the contrast.

It should be understood by those skilled in the art that the rest of the structure and the operation principle of the present embodiment are the same as those of the first embodiment, and are not described herein again.

[ third example ]

Fig. 7 is a schematic cross-sectional view of a display panel in an initial state according to a third embodiment of the present invention. As shown in fig. 7, a display panel according to a third embodiment of the present invention is substantially the same as the display panel according to the first embodiment (fig. 1 to fig. 5), except that in the present embodiment, the retaining wall 30 includes a first retaining wall portion 30a and a second retaining wall portion 30b, an end of the first retaining wall portion 30a away from the second retaining wall portion 30b is fixed to the first substrate 10, and an end of the second retaining wall portion 30b away from the first retaining wall portion 30a is fixed to the second substrate 20. That is, the retaining walls 30 are formed on the first substrate 10 and the second substrate 20 through two processes, and finally the first substrate 10 and the second substrate 20 are boxed. The problem that one process is difficult to complete due to the fact that the retaining wall 30 is too high is avoided. The second barrier portions 30b are formed on the second substrate 20 side, which is advantageous for preventing crosstalk between sub-pixels and improving gravity mura.

It should be understood by those skilled in the art that the rest of the structure and the operation principle of the present embodiment are the same as those of the first embodiment, and are not described herein again.

[ example four ]

Fig. 8 is a schematic plan view of a first substrate according to a fourth embodiment of the invention. As shown in fig. 8, the display panel according to the fourth embodiment of the present invention has substantially the same structure as the display panel according to the first embodiment (fig. 1 to 5), except that in this embodiment, the dummy club 13 may also be disposed above the scan line 1, the data line 2 and the tft 3. Specifically, a scan line 1, a gate electrode, a gate insulating layer, an active layer, a data line 2, a drain electrode and a source electrode are sequentially formed on a first substrate 10, and then an OC material is covered and a microstructure protrusion 11 and a bump 13 are formed, a contact hole 101 is formed at the corresponding source, a pixel electrode 12 is formed to cover the microstructure protrusion 11, the pixel electrode 12 is electrically connected to the drain through the contact hole 101, then, the first common electrode 14 and the first insulating layer 15 covering the first common electrode 14 and the pixel electrode 12 are sequentially formed, and the pixel electrode 12 and the first common electrode 14 can be formed by using the same metal film, but when the scanning line 1 is made, the capacitor plate 4 partially overlapping the pixel electrode 12 is also made, the capacitor plate 4 and the scan line 1 are disposed in the same layer, are located in the pixel unit SP, and are disposed opposite to the pixel electrode 12, and are used for forming a storage capacitor with the pixel electrode 12.

It should be understood by those skilled in the art that the rest of the structure and the operation principle of the present embodiment are the same as those of the first embodiment, and are not described herein again.

The invention also provides a display device comprising the display panel.

In this document, the terms of upper, lower, left, right, front, rear and the like are used to define the positions of the structures in the drawings and the positions of the structures relative to each other, and are only used for the sake of clarity and convenience in technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims. It is also to be understood that the terms "first" and "second," etc., are used herein for descriptive purposes only and are not to be construed as limiting in number or order.

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.