阅读说明：本技术 反射式电子纸显示模组及其制作方法、显示装置 (Reflective electronic paper display module, manufacturing method thereof and display device ) 是由 华刚 王光泉 邓立广 王冬 王哲 李少波 王敏 胡锦堂 苏少凯 刘景昊 潘靓靓 于 2021-08-18 设计创作，主要内容包括：本公开是关于一种反射式电子纸显示模组及其制作方法、显示装置,本公开的反射式电子纸显示模组,电子墨水屏设于像素电极远离衬底基板的一侧,在电子墨水屏与薄膜晶体管之间设彩色滤光层,或将电子墨水屏为彩色电子墨水屏,衬底基板的第二面为显示模组的显示面。光线经衬底基板入射至电子墨水屏,经电子墨水屏反射后的光形成显示画面,通过衬底基板的第二面进行显示,实现彩色显示效果。衬底基板直接作为导光板,无需单独设置导光板,减小了显示模组的厚度。该显示模组可以通过光刻的方式在薄膜晶体管层上形成彩色滤光层,加工工艺简单且对位精度较高。彩色滤光层与电子墨水屏之间的距离大大缩小,使得显示时没有颜色损失,分辨率较高。(The invention relates to a reflective electronic paper display module, a manufacturing method thereof and a display device. The light is incident to the electronic ink screen through the substrate, the light reflected by the electronic ink screen forms a display picture, and the display is carried out through the second surface of the substrate, so that the color display effect is realized. The substrate base plate directly is as the light guide plate, need not to set up the light guide plate alone, has reduced display module's thickness. The display module can form the color filter layer on the thin film transistor layer in a photoetching mode, and is simple in processing technology and high in alignment precision. The distance between the color filter layer and the electronic ink screen is greatly reduced, so that color loss is avoided during display, and the resolution is high.)

1. The utility model provides a reflective electronic paper display module assembly which characterized in that includes:

the substrate base plate is provided with a first surface and a second surface which are oppositely arranged, and the second surface is a display surface of the display module;

a pixel array including a plurality of sub-pixel regions formed on the substrate base;

a plurality of thin film transistors respectively provided in the sub-pixel regions;

the pixel electrodes are respectively arranged in the sub-pixel areas and are connected with the drain electrodes of the thin film transistors;

the electronic ink screen is positioned on one side of the pixel electrode, which is far away from the substrate;

the common electrode is positioned on one side of the electronic ink screen far away from the pixel electrode;

the electronic ink screen is a black-and-white electronic ink screen, and a color filter layer is arranged between the electronic ink screen and the thin film transistor; or the electronic ink screen is a color electronic ink screen.

2. The reflective electronic paper display module of claim 1, wherein the color filter layer is located between the pixel electrode and the thin film transistor, and the pixel electrode is connected to the drain electrode through a via hole formed in the color filter layer.

3. The reflective electronic paper display module of claim 1, further comprising a storage capacitor electrode, wherein a capacitor is formed between the storage capacitor electrode and the pixel electrode, and the storage capacitor electrode is located between the substrate and the color filter layer.

4. The reflective electronic paper display module of claim 3, wherein the storage capacitor electrode is located between the substrate base plate and the thin film transistor.

5. The reflective electronic paper display module of claim 3, wherein the pixel electrode and the storage capacitor electrode are transparent metal oxides.

6. The reflective electronic paper display module of claim 1, wherein the electronic ink layer comprises a transparent carrier and a plurality of microcapsules fixed in the transparent carrier, the microcapsules comprising a wrapping layer, the wrapping layer containing a transparent fluid, the transparent fluid containing black particles and white particles of different electrical properties.

7. A display device, comprising the reflective electronic paper display module according to any one of claims 1 to 6.

8. A manufacturing method of a reflective electronic paper display module is characterized by comprising the following steps:

providing a substrate base plate, wherein the substrate base plate is provided with a first surface and a second surface which are oppositely arranged;

forming a pixel array including a plurality of sub-pixel regions on the first face;

forming a thin film transistor in each sub-pixel region;

forming the color filter layer between the pixel electrode and the thin film transistor, and arranging a through hole on the color filter layer;

forming a pixel electrode in each sub-pixel area respectively, and connecting the pixel electrode with the drain electrode of the thin film transistor through the through hole;

and forming an electronic ink screen and a common electrode on one side of the pixel electrode far away from the substrate.

9. The method as claimed in claim 8, wherein the color filter layer is formed by photolithography on a side of the thin film transistor away from the substrate.

10. The method of claim 8, further comprising:

and forming a storage capacitor electrode between the substrate base plate and the thin film transistor, wherein a capacitor is formed between the storage capacitor electrode and the pixel electrode.

Technical Field

The disclosure relates to the technical field of display, in particular to a reflective electronic paper display module, a manufacturing method thereof and a display device.

Background

An Electronic Paper Display (EPD) is a paper-like Electronic display. The electronic paper can bring comfortable visual display like paper, and can also realize the display function of a common display.

The alignment process of the sub-pixel region of the conventional electronic paper display is complex, and the alignment precision of the sub-pixel region cannot be ensured, so that the resolution is low during display, and the display effect is poor.

It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The present disclosure is directed to overcome the defects of complicated alignment process and poor alignment precision of sub-pixel regions of the conventional electronic paper display, and provides a reflective electronic paper display module with simple alignment process and high alignment precision and a manufacturing method thereof.

According to one aspect of the disclosure, a reflective electronic paper display module is provided, which includes a substrate, a plurality of thin film transistors, a plurality of pixel electrodes, an electronic ink screen, and a common electrode, wherein the substrate has a first surface and a second surface that are arranged oppositely, the second surface is a display surface of the display module, a pixel array is formed on the substrate, the pixel array includes a plurality of sub-pixel regions, the plurality of thin film transistors are respectively disposed in the sub-pixel regions, the plurality of pixel electrodes are respectively disposed in the sub-pixel regions and connected to drain electrodes of the thin film transistors, the electronic ink screen is located on a side of the pixel electrodes away from the substrate, and the common electrode is located on a side of the electronic ink screen away from the pixel electrodes; the electronic ink screen is a black-and-white electronic ink screen, and a color filter layer is arranged between the electronic ink screen and the thin film transistor; or the electronic ink screen is a color electronic ink screen.

In one embodiment of the disclosure, the color filter layer is located between the pixel electrode and the thin film transistor, and the pixel electrode is connected to the drain electrode through a via hole formed in the color filter layer.

In an embodiment of the disclosure, the display module further includes a storage capacitor electrode, a capacitor is formed between the storage capacitor electrode and the pixel electrode, and the storage capacitor electrode is located between the substrate and the color filter layer.

In one embodiment of the present disclosure, the storage capacitor electrode is located between the substrate base plate and the thin film transistor.

In one embodiment of the present disclosure, the pixel electrode and the storage capacitor electrode are transparent metal oxides.

In one embodiment of the present disclosure, the electronic ink layer includes a transparent carrier and a plurality of microcapsules fixed in the transparent carrier, the microcapsules include a wrapping layer, a transparent fluid is disposed in the wrapping layer, and black particles and white particles of different electric properties are disposed in the transparent fluid.

According to another aspect of the present disclosure, a display device is provided, which includes the reflective electronic paper display module according to one aspect of the present disclosure.

According to another aspect of the present disclosure, a method for manufacturing a reflective electronic paper display module is provided, the method comprising:

providing a substrate base plate, wherein the substrate base plate is provided with a first surface and a second surface which are oppositely arranged;

forming a pixel array including a plurality of sub-pixel regions on the first face;

respectively forming a thin film transistor in each sub-pixel region;

forming a pixel electrode in each sub-pixel area, and connecting each pixel electrode with the drain electrode of the corresponding thin film transistor;

forming an electronic ink screen on one side of the pixel electrode, which is far away from the substrate;

and forming a common electrode on the side of the electronic ink screen far away from the pixel electrode.

In one embodiment of the present disclosure, the method further comprises: and forming a color filter layer between the pixel electrode and the thin film transistor, arranging a through hole on the color filter layer, and connecting the pixel electrode with the drain electrode through the through hole.

In one embodiment of the disclosure, the color filter layer is formed on the side of the thin film transistor far away from the substrate by means of photolithography.

In one embodiment of the present disclosure, the method further comprises: a storage capacitor electrode is formed between the substrate and the thin film transistor, and a capacitor is formed between the storage capacitor electrode and the pixel electrode.

According to the reflective electronic paper display module, the electronic ink screen is arranged on one side, away from the substrate base plate, of the pixel electrode, and the color filter layer is arranged between the electronic ink screen and the thin film transistor, or the electronic ink screen is a color electronic ink screen, and the second surface of the substrate base plate is a display surface of the display module. The light is incident to the electronic ink screen through the substrate, the light reflected by the electronic ink screen forms a display picture, and the display is carried out through the second surface of the substrate, so that the color display effect is realized. The substrate base plate can directly be as the light guide plate, need not to set up the light guide plate alone, has reduced display module's thickness. The display module can form the color filter layer on the thin film transistor layer in a photoetching mode, the processing technology is simple, the alignment precision is high, the size of an RGB color block in the color filter layer can be set to be the same as that of a sub-pixel area, and the sub-pixel area is aligned to the RGB color block. The distance between the color filter layer and the electronic ink screen is greatly reduced, so that color loss is avoided during display, and the resolution is high. Therefore, the display module has better display effect.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.

Fig. 1 is a cross-sectional structural view of a display module according to the related art.

Fig. 2 is a cross-sectional structural view of another display module according to the related art.

Fig. 3 is a diagram illustrating a corresponding relationship between sub-color blocks and sub-pixel regions of a display module according to the related art.

Fig. 4 is a diagram illustrating a corresponding relationship between RGB color blocks and sub-pixel regions of a display module according to the related art.

Fig. 5 is a partial cross-sectional view of a display module according to the related art.

Fig. 6 is a cross-sectional structural view of a display module according to an embodiment of the disclosure.

Fig. 7 is a diagram illustrating a correspondence relationship between RGB color blocks and sub-pixel regions of a display module according to an embodiment of the present disclosure.

Fig. 8 is a partial cross-sectional view of a display module according to an embodiment of the disclosure.

Fig. 9 is a flowchart of a method for manufacturing a display module according to an embodiment of the disclosure.

In fig. 1 to 5: 101-array substrate, 1011-thin film transistor, 1012-grid line, 1013-data line, 1014-pixel electrode, 102-buffer layer, 103-electronic ink screen, 104-first adhesive layer, 105-substrate, 106-second adhesive layer, 107-color filter layer, 1070-RGB color block, 1071-red sub-color block, 1072-green sub-color block, 1073-blue sub-color block, 108-glass substrate, 109-third adhesive layer, 110-light guide plate, 111-fourth adhesive layer, 112-cover plate, 113-sub-pixel region, 114-waterproof film;

in fig. 6 to 9: 201-substrate base plate, 202-grid electrode, 203-grid insulating layer, 204-active layer, 205-source electrode, 206-drain electrode, 207-protective layer, 208-color filter layer, 2080-RGB color block, 2081-red sub color block, 2082-green sub color block, 2083-blue sub color block, 209-pixel electrode, 210-electronic ink screen, 211-common electrode, 212-storage capacitor electrode, 213-sub pixel area, 214-thin film transistor, 215-grid line and 216-data line.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.

Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.

The terms "a," "an," "the," "said," and "at least one" are used to indicate the presence of one or more elements/components/parts/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and are not limiting on the number of their objects.

An Electronic Paper Display (EPD) is a paper-like display, and its working principle is that black particles and white particles of an Electronic ink screen undergo electrophoresis under the action of voltage to form black and white colors. The electronic paper display is relatively single in color at present, is only suitable for narrow commercial display markets, and is enhanced in color necessity as eye protection factors become more and more important education industry standards, and common consumers have stronger and stronger requirements for reading colored cartoons and drawing books. Therefore, a color electronic paper display is proposed, and the current color electronic paper display realizes color display by using a technique of combining multicolor particles with color printing (print color), and needs to print color ink separately and has complex technical operation.

In the related art, a display module is provided, which can realize a color display effect and is beneficial to cost reduction. As shown in fig. 1, the display module includes an array substrate 101, a buffer layer 102, an electronic ink panel 103, a first adhesive layer 104, a substrate 105, a second adhesive layer 106, and a color filter layer 107, where the buffer layer 102 is disposed on one side of the array substrate 101, the electronic ink panel 103 is disposed on one side of the buffer layer 102 away from the array substrate 101, the first adhesive layer 104 is disposed on one side of the electronic ink panel 103 away from the array substrate 101, the second adhesive layer 106 is disposed on one side of the first adhesive layer 104 away from the array substrate 101, the color filter layer 107 is disposed on one side of the second adhesive layer 106 away from the array substrate 101, and the color filter layer 107 is disposed on a glass substrate 108 to form a color filter glass. It can be seen that the display module is provided with an electronic ink screen 103 on an array substrate 101, and a color filter layer 107 is provided on the electronic ink screen 103.

In addition, the display module further includes a third adhesive layer 109, a light guide plate 110, a fourth adhesive layer 111 and a cover plate 112, the third adhesive layer 109 is disposed on a side of the glass substrate 108 away from the array substrate 101, the light guide plate 110 is disposed on a side of the third adhesive layer away from the array substrate 101, the fourth adhesive layer 111 is disposed on a side of the light guide plate 110 away from the array substrate 101, and the cover plate 112 is disposed on a side of the fourth adhesive layer 111 away from the array substrate 101. The light guide plate 110 is disposed on the color filter layer 107, so as to improve the light reflection effect, especially under the condition of poor ambient light.

The light emitted by the electronic ink screen 103 is filtered by the color filter layer 107, so that a colored display effect can be realized, the color filter layer 107 is arranged in a pasting mode, the distance between the color filter layer 107 of the display module and the electronic ink screen 103 is large, and the RGB color blocks 1070 of the color filter layer 107 are difficult to align with one sub-pixel region 113, so that the color loss is severe during imaging.

Therefore, on the basis of the display module, the distance between the color filter layer 107 and the electronic ink screen 103 is reduced, and another display module is provided. As shown in fig. 2, the display module reduces the thickness of the color filter layer 107, reduces the layer structure between the color filter layer 107 and the electronic ink screen 103, directly manufactures the printed RGB color blocks 1070 on the substrate 105 to form the color filter layer 107, and arranges the waterproof film 114 on the side of the color filter layer 107 away from the array substrate 101. When the RGB color block 1070 is printed, the RGB color block 1070 is strictly corresponding to the sub-pixel region 113 by a high-precision alignment device, thereby improving the display effect. The color filter layer 107 needs to be bonded by the first adhesive layer 104. The display module is complex in manufacturing process and complex in alignment requirement.

As shown in fig. 3 and 4, in the display module according to the above embodiments, in order to meet the alignment and display requirements, colorization is generally implemented by using one RGB color block by combining a plurality of pixels. One sub-color block in the RGB color block 1070 corresponds to three sub-pixel regions 113, that is, one RGB color block 1070 corresponds to nine sub-pixel regions 113, wherein one RGB color block 1070 is formed by three sub-color blocks of different colors in the transverse direction, one RGB color block 1070 is formed by three sub-color blocks of different colors in the longitudinal direction, and the plurality of RGB color blocks 1070 are sequentially arranged in the transverse direction and the longitudinal direction, respectively. It can be found that the area of the sub-color block is smaller than the area of the three sub-pixel regions 113 corresponding thereto. This approach can reduce the color loss of the display module, but at the same time sacrifice resolution and pixel density (Pixels Per inc, PPI).

As shown in fig. 5, in the display module shown in fig. 1 and 2, the array substrate 101 includes a thin film transistor 1011, a gate electrode of the thin film transistor 1011 is connected to a control circuit board through a gate line 1012, and one of a source electrode and a drain electrode of the thin film transistor 1011 is connected to the control circuit board through a data line 1013. The different thin film transistors 1011 are driven by the control circuit board, and the other of the source and drain electrodes of the thin film transistors 1011 is connected to the pixel electrode 1014 to change the electric field between the pixel electrode 1014 and a common electrode (not shown in the figure), thereby forming a plurality of sub-pixel regions. By driving each thin film transistor, the corresponding sub-pixel region emits light, and the color image to be displayed is displayed through the RGB color blocks 1070 corresponding to the sub-pixel region.

The embodiment of the disclosure provides another reflective electronic paper display module. As shown in fig. 6 to 8, the display module includes a substrate 201, a plurality of thin film transistors 214, a plurality of pixel electrodes 209, an electronic ink screen 210 and a common electrode 211, the substrate 201 has a first surface and a second surface which are oppositely disposed, and the second surface is a display surface of the display module; a pixel array is formed on the substrate 201, the pixel array includes a plurality of sub-pixel regions 213, a plurality of thin film transistors 214 are respectively disposed in the sub-pixel regions 213, a plurality of pixel electrodes 209 are respectively disposed in the sub-pixel regions 213 and connected to the drain 205 of the thin film transistor 214, the electronic ink panel 210 is located on a side of the pixel electrodes 209 away from the substrate 201, and the common electrode 211 is located on a side of the electronic ink panel 210 away from the pixel electrodes 209. The electronic ink screen 210 is a black-and-white electronic ink screen, and a color filter layer 208 is arranged between the electronic ink screen 210 and the thin film transistor 214; or the electronic ink screen 210 is a color electronic ink screen.

Light is incident to the electronic ink screen 210 through the substrate 201, light reflected by the electronic ink screen 210 forms a display image, the display image is displayed through the second surface of the substrate 201, and a user can see a color image when watching the display image in a direction facing the second surface.

The substrate base plate directly is as the light guide plate, need not to set up the light guide plate alone, has reduced display module's thickness. The display module can arrange the color filter layer 208 on the thin film transistor 214 in a photoetching mode, the processing technology is simple, the alignment precision is high, the size of a single color block in the color filter layer 208 can be the same as that of one sub-pixel area 213, and one sub-pixel area 213 is aligned with one single color block. The distance between the color filter layer 208 and the electronic ink screen 210 is greatly reduced, so that color loss is avoided during display, and the resolution is higher. Therefore, the display module has better display effect.

The color filter layer 208 is disposed on the tft 214 by photolithography, so that an array substrate having the color filter layer 208 can be formed, and the common electrode is usually attached to the electronic ink panel 210 at a side away from the substrate 201 in a whole layer, and is usually integrally formed when the array substrate is shipped. Therefore, when the reflective electronic paper display module is manufactured, only the electronic ink screen 210 with the common electrode and the array substrate with the color filter layer 208 need to be assembled, so that the reflective electronic paper display module is efficient, convenient and fast and has high production efficiency.

It can be understood that the user can also view the black-and-white picture corresponding to the color picture from the direction facing the first surface of the substrate base 201.

As shown in fig. 6, the thin film transistor includes a gate electrode 202, a gate insulating layer 203, an active layer 204, a source electrode 205, and a drain electrode 206, the gate electrode 202 is disposed on a first surface of the substrate base 201, the gate electrode 202 is connected to a control circuit board through a gate line connected thereto, the gate insulating layer 203 is disposed on a side of the gate electrode 202 away from the substrate base 201, the active layer 204 is disposed on a side of the gate insulating layer 203 away from the substrate base 201, the source electrode 205 is disposed on a side of the active layer 204 away from the substrate base 201, the source electrode 205 is connected to the active layer 204 and connected to the control circuit board through a data line connected thereto, the drain electrode 206 is disposed on a side of the active layer 204 away from the substrate base 201, and the drain electrode 206 is connected to the active layer 204 and connected to the pixel electrode 209. The source electrode 205 may be connected to the pixel electrode 209, and the drain electrode 206 may be connected to the control circuit board through a data line connected thereto.

The drain 206 is connected to the pixel electrode 209 as an example. The color filter layer 208 is provided with a plurality of first via holes corresponding to the pixel electrodes one to one. The pixel electrode is connected to the drain electrode 206 through the first via hole. The thin film transistor may further include a protective layer 207, the protective layer 207 is disposed on the source and drain electrodes 205 and 206 on a side away from the substrate base 201, a second via hole communicating with the first via hole is disposed on the protective layer 207, and the pixel electrode is connected to the drain electrode 206 through the first via hole and the second via hole in sequence. It is understood that the thin film transistors, the pixel electrodes, and the sub-pixel regions 213 correspond one to one.

The color filter layer 208 may be formed directly as an insulating layer on the source electrode 205 and the drain electrode 206 on the side away from the base substrate 201 by a technique of forming a color filter layer (COA) on a Thin Film Transistor (TFT). The color filter layer 208 can be further arranged on the side, away from the substrate 201, of the protective layer 207, the protective layer is added, so that the data lines are far away from the pixel electrodes, the data lines and the pixel electrodes cannot be affected with each other, the area of the pixel electrodes can be maximized, and the display uniformity and the display effect are improved. Meanwhile, the protective layer 207 increases the thickness between the dielectric materials between the thin film transistor 214 and the pixel electrode 209, and improves the pressure resistance of the display module, thereby improving the product yield of the display module.

It should be noted that, no matter the color filter layer 208 is directly formed as an insulating layer on the side of the source electrode 205 and the drain electrode 206 away from the base substrate 201, or the color filter layer 208 is formed on the side of the protection layer 207 away from the base substrate 201, the color filter layer 208 can be formed on the tft 214 by photolithography using an exposure machine, the process is relatively simple, and the accuracy of the RGB color patches 2080 and the alignment accuracy of the sub-pixel regions 213 can be ensured.

In other embodiments, the color filter layer 208 may also be disposed between the pixel electrode 209 and the electronic ink layer 210, that is, an insulating layer is disposed on the pixel electrode, and the color filter layer 208 is lithographically etched on a side of the insulating layer away from the substrate 201, so that a distance between the color filter layer 208 and the electronic ink screen 210 can be further reduced, a color loss during display can be further reduced, and a resolution can be improved. However, the thickness of the display module is increased due to the addition of one insulating layer.

As shown in fig. 6, the color filter layer 208 includes a plurality of RGB patches 2080, each RGB patch 2080 including three different color sub-patches, namely: the color image display device comprises red sub-color blocks 2081, green sub-color blocks 2082 and blue sub-color blocks 2083, wherein the blue sub-color blocks 2083 are displayed, and the red sub-color blocks 2081 and the green sub-color blocks 2082 are only partially displayed, but the cross-section sizes of the three sub-color blocks with different colors are consistent. Each sub-color block is provided with a first through hole, the pixel electrode passes through the first through hole to be connected with the drain electrode 206, and one sub-color block corresponds to one pixel electrode. As shown in fig. 7, one RGB color patch may correspond to three sub-pixel regions 213. It can be understood that the area of the sub-pixel region 213 is smaller, so that the resolution and the pixel density are higher, which is beneficial to improving the fineness of the colorized display. On the basis, the area of the sub-pixel region 213 can be further reduced, the RGB color blocks can be made smaller adaptively, and the fineness of the colorized display is further improved.

The electronic ink screen 210 includes an organic carrier and a plurality of microcapsules fixed in the organic carrier, the microcapsules include a wrapping layer, a transparent fluid is provided in the wrapping layer, and black particles and white particles having different electrical properties are provided in the transparent fluid. The electric field between the pixel electrode and the common electrode 211 is changed by controlling the pixel electrode through the thin film transistor. When the electric field between the pixel electrode and the common electrode 211, i.e. the common electrode, is changed, the black particles and the white particles move to the pixel electrode or the common electrode 211 according to the direction of the electric field, so that each microcapsule appears black or white.

If color display is to be achieved according to requirements, black particles and white particles in microcapsules corresponding to different color sub-color blocks are controlled to move towards the pixel electrode or the common electrode 211 according to the direction of an electric field, so that one side, close to the color filter layer 208, of each microcapsule in the corresponding sub-pixel region 213 presents black or white, the black particles absorb external incident light and present a dark state, the white particles reflect the incoming external light, and the reflected light is filtered by the corresponding sub-color blocks, so that the color corresponding to the sub-color blocks can be displayed. Therefore, the user can see the color picture displayed by the display module.

The display substrate is provided with the light source, so that the display module can be used under the condition that no external light exists. The light source is generally arranged on the side surface of the display module, the substrate is used as a light guide plate, and light emitted by the light source is reflected by the substrate and then is incident to the electronic ink screen. Even use under the darker condition of ambient light, also can not receive the influence basically, can promote this display module's display effect.

The electronic ink screen 210 may be attached to the pixel electrodes 209 by a transparent conductive adhesive, and the common electrode 211 is typically integrally formed with the electronic ink screen 210. A reflective layer may be further disposed on a side of the electronic ink layer away from the substrate 201 or a side of the common electrode 211 close to the substrate 201 to improve the display effect. The common electrode 211 may be made of metal directly to achieve a light reflecting effect. In addition, an encapsulation substrate (not shown in the figure) may be disposed on a side of the common electrode 211 away from the substrate 201, and the encapsulation substrate may be adhered to the common electrode 211 by an optically transparent adhesive.

The user can also look at the side of the package substrate far away from the substrate 201 to see the black and white picture corresponding to the color picture. As required, the common electrode 211 may be a transparent conductive film to prevent the transmittance of the display module from being affected. For example, the material of the common electrode 211 may be Indium Tin Oxide (ITO).

It should be noted that, because the processing technology of the color filter layer 208 is simple and the alignment precision is high, the substrate 201 and the package substrate may be flexible substrates, and the display module can be bent according to the display requirement, so as to achieve the curved surface display effect.

The second surface of the substrate 201 is a display surface of the display module, and the transmittance thereof has a certain loss. Specifically, the pixel electrodes 209, the tfts 214 and the traces thereof cause a certain loss of transmittance of the display module, and the storage capacitor also causes a certain loss of transmittance of the display module because the display module needs a larger storage capacitor.

In order to prevent the above problem, the structures of the storage capacitor and the thin film transistor may be optimized by design.

As shown in fig. 6, the display module further includes a storage capacitor electrode 212, a capacitor is formed between the storage capacitor electrode 212 and the pixel electrode 209, and the storage capacitor electrode 212 is located between the substrate 201 and the color filter layer 208.

In the present embodiment, the storage capacitor electrode is located between the substrate base plate and the thin film transistor.

Specifically, the storage capacitor electrode 212 may be disposed between the gate 202 and the substrate 201, the storage capacitor electrode 212 is in direct contact with the gate 202, and the storage capacitor electrode 212 and the pixel electrode 209 form a storage capacitor. The advantage of this arrangement is that the storage capacitor electrode 212 and the gate 202 can be fabricated by the same equipment and process, which saves cost and improves efficiency.

In other embodiments, the storage capacitor electrode may be disposed on the gate insulating layer 203 and connected to the active layer 204, and the storage capacitor electrode may be disposed on the passivation layer and connected to the source 205 or the drain 206.

It is to be emphasized that the pixel electrode 209 and the storage capacitor electrode 212 are both made of transparent conductive films, and for example, the material of the pixel electrode 209 and the storage capacitor electrode 212 may be an Indium Tin Oxide (ITO) film. Thus, the storage capacitor is arranged, and the influence of the storage capacitor and the pixel electrode 209 on the transmittance of the display module is eliminated.

As shown in fig. 8, on the basis of the above, the size of the thin film transistor can be reduced and the routing can be thinned. It can be seen that the orthographic projection of the thin film transistor on the pixel electrode occupies the width of the pixel electrode, the orthographic projection of the gate line 215 connected to the gate electrode on the pixel electrode occupies the width of the pixel electrode, and the orthographic projection of the data line 216 connected to the source electrode or the drain electrode on the pixel electrode occupies the width of the pixel electrode, which are relatively close to each other, and usually, the gate line and the data line are located in the non-display area of the display module, so the thin film transistor is also located almost in the non-display area of the display module. It can be understood that the thin film transistor and the lead thereof cause less transmittance loss to the display module, and even have no influence on the transmittance of the display module.

By the technical means, the transmittance of the display surface of the display module can be improved to eighty-five percent to ninety-two percent. In order to further increase the transmittance of the display surface, the color filter layer 208 may be directly formed on the source electrode 205 and the drain electrode 206 on the side away from the substrate 201, and the filter layer 208 also has the insulating function of the protection layer 207.

When the display module is 50% of transmittance, the display picture can be seen from the back of the display module, and the display picture on the back is darker because the transmittance of 50% is not high. Promote the back with the transmissivity, the display module assembly back can obtain with the display module assembly of 50% transmissivity openly very close display effect, and display effect is better.

The display module is generally applied to consumer electronics. This kind of electronic product can dispose the light source at the display surface usually, generally locates the side of display module assembly, and the substrate base plate is as the light guide plate, and the light that the light source sent is incident to the electron ink screen even use under the darker circumstances of ambient light after the reflection of substrate base plate, also can not receive the influence basically, can promote this display module assembly's display effect.

Meanwhile, it can be understood that the display module has very obvious advantages in direct display under outdoor sunlight, and under the condition that outdoor light is strong, light rays reflected by the electronic ink screen 210 are increased, and the brightness of a display picture is correspondingly increased. Therefore, the display module can be widely applied to bus stop boards or outdoor advertising boards.

The display module can be a single-chip module, and the display module can be a single-chip module.

It should be noted that, the display device includes other necessary components and components besides the display module, taking a display as an example, specifically, such as a housing, a circuit board, a power line, and the like, and those skilled in the art can supplement the display device accordingly according to the specific use requirements of the display device, and details are not described herein.

The display device may be a conventional electronic device, for example: cell phones, computers, televisions, video recorders and video players, as well as emerging wearable devices such as VR glasses, not to mention here.

The embodiment of the disclosure also provides a manufacturing method of the display module. As shown in fig. 9, the method may include:

in step S10, a substrate board 201 is provided, where the substrate board 201 has a first side and a second side oppositely disposed.

In step S20, a pixel array including a plurality of sub-pixel regions 213 is formed on the first surface.

In step S30, one thin film transistor 214 is formed in each sub-pixel region 213.

In step S40, the color filter layer 208 is formed on the side of the thin-film transistor layer 214 away from the substrate 201, and a first via hole is formed in the color filter layer 208.

In step S50, a pixel electrode 209 is formed in each sub-pixel region 213, and the pixel electrode 209 is connected to the drain 206 of the thin-film transistor layer 214 through the first via.

In step S60, an electronic ink screen 210 and a common electrode 211 are formed on the side of the pixel electrode 209 away from the base substrate 201.

The display module can arrange the color filter layer 208 on the thin film transistor 214 in a photoetching mode, the processing technology is simple, the alignment precision is high, the size of a single color block in the color filter layer 208 can be the same as that of one sub-pixel area 213, and one sub-pixel area 213 is aligned with one single color block. The distance between the color filter layer 208 and the electronic ink screen 210 is greatly reduced, so that color loss is avoided during display, and the resolution is higher. Therefore, the display module has better display effect.

The color filter layer 208 is disposed on the tft 214 by photolithography, so that an array substrate having the color filter layer 208 can be formed, and the common electrode is usually attached to the electronic ink panel 210 at a side away from the substrate 201 in a whole layer, and is usually integrally formed when the array substrate is shipped. Therefore, when the reflective electronic paper display module is manufactured, only the electronic ink screen 210 with the common electrode and the array substrate with the color filter layer 208 need to be assembled, so that the reflective electronic paper display module is efficient, convenient and fast and has high production efficiency.

The method may further comprise:

step S10 further includes: the substrate is preprocessed, that is, a storage capacitor electrode 212 is formed between the first surface of the substrate 201 and the thin film transistor, and the storage capacitor electrode 212 and the pixel electrode 209 form a storage capacitor.

Step S30 may include: the process of disposing a thin film transistor may include:

forming a gate plating layer on a first surface of a substrate 201, and patterning the gate plating layer to form a plurality of gates 202;

forming a gate insulating layer 203 on one side of the gate 202 away from the substrate 201;

forming an active layer plating layer on one side of the gate insulating layer 203 far away from the substrate 201, and patterning the active layer plating layer to form a plurality of active layers 204;

forming a source-drain electrode cladding layer on one side of the active layer 204 far away from the substrate base plate 201, patterning the source-drain electrode cladding layer to form a plurality of source electrodes 205 and drain electrodes 206, and respectively connecting one source electrode 205 and one drain electrode 206 with one active layer 204.

Step S30 may further include: a protective layer 207 is formed on the source 205 and the drain 206 away from the substrate 201, and a second via hole is opened in the protective layer 207.

Step 40 may include:

a color filter coating is formed on one side of the protective layer 207, which is far away from the substrate 201, by means of photolithography, and the color filter coating is patterned to form a plurality of RGB color blocks 2080.

Each RGB patch 2080 includes a red sub-patch 2081, a green sub-patch 2082, and a blue sub-patch 2083, and first via holes are respectively formed in the red sub-patch 2081, the green sub-patch 2082, and the blue sub-patch 2083.

The RGB is made of resin, so the color filter layer 208 can be disposed on the tft 214 by photolithography, and compared with the method of attaching and aligning the color filter layer, the method has a simple processing process and high alignment accuracy, and can set the single color block in the color filter layer 208 to be the same as the size of one sub-pixel region 213, and align the single color block with one sub-pixel region 213, so that the processing process is simple and the alignment accuracy is high.

Step S50 may include:

a pixel electrode plating layer is formed on the side of the color filter layer 208 away from the substrate, the pixel electrode plating layer is patterned to form pixel electrodes 209 corresponding to the plurality of drain electrodes 206 one to one, and each pixel electrode 209 sequentially passes through the first via hole and the second via hole to be connected to the drain electrode 206.

Step S60 may include; an optically transparent adhesive is arranged on the side of the pixel electrode 209 far away from the substrate 201, the electronic ink screen 210 is adhered to the pixel electrode 209 through the optically transparent adhesive, and the common electrode 211 is formed in advance on the side of the electronic ink screen 210 far away from the substrate 201.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.