CN113655667B

CN113655667B - Reflective electronic paper display module, manufacturing method thereof and display device

Info

Publication number: CN113655667B
Application number: CN202110948987.XA
Authority: CN
Inventors: 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
Original assignee: BOE Technology Group Co Ltd; Beijing BOE Display Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Beijing BOE Display Technology Co Ltd
Priority date: 2021-08-18
Filing date: 2021-08-18
Publication date: 2023-10-17
Anticipated expiration: 2041-08-18
Also published as: CN113655667A

Abstract

The application relates to a reflective electronic paper display module, a manufacturing method thereof and a display device. The light rays are 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 performed through the second surface of the substrate, so that a color display effect is realized. The substrate is directly used as the light guide plate, and the light guide plate is not required to be arranged independently, so that the thickness of the display module is reduced. The display module can form a color filter layer on the thin film transistor layer in a photoetching mode, and has simple processing technology and higher alignment precision. The distance between the color filter layer and the electronic ink screen is greatly reduced, so that no color loss exists during display, and the resolution ratio is high.

Description

Reflective electronic paper display module, manufacturing method thereof and display device

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

The sub-pixel region alignment process of the existing electronic paper display is complex, and the alignment precision of the sub-pixel region cannot be guaranteed, so that the resolution ratio is lower during display, and the display effect is poor.

It should be noted that the information disclosed in the above background section is only for enhancing 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 application aims to overcome the defects of complex alignment process and poor alignment precision of a sub-pixel area of the existing electronic paper display and provide 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, including a substrate, a plurality of thin film transistors, a plurality of pixel electrodes, an electronic ink screen and a common electrode, where the substrate has a first surface and a second surface which are oppositely arranged, 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 areas, the plurality of thin film transistors are respectively arranged in the sub-pixel areas, the plurality of pixel electrodes are respectively arranged in the sub-pixel areas and connected with drain electrodes of the thin film transistors, the electronic ink screen is located at one side of the pixel electrode far away from the substrate, and the common electrode is located at 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.

In one embodiment of the present 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 provided on the color filter layer.

In one 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 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 disclosure, the electronic ink screen 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 with different electrical properties are disposed in the transparent fluid.

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

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

providing a substrate, wherein the substrate 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 a first surface;

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

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

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

a common electrode is formed on a side of the electronic ink screen remote 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, and arranging a via hole in the color filter layer, wherein the pixel electrode is connected with the drain electrode through the via hole.

In one embodiment of the present disclosure, the color filter layer is formed on a side of the thin film transistor away from the substrate by 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 capacitance is formed between the storage capacitor electrode and the pixel electrode.

The reflective electronic paper display module is characterized in that the electronic ink screen is arranged on one side of the pixel electrode far away from the substrate, 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, and the second surface of the substrate is a display surface of the display module. The light rays are 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 performed through the second surface of the substrate, so that a color display effect is realized. The substrate can be directly used as the light guide plate without arranging the light guide plate independently, so that the thickness of the display module is reduced. 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, RGB color blocks in the color filter layer can be set to be the same as a sub-pixel region in size, and one sub-pixel region is aligned with one RGB color block. The distance between the color filter layer and the electronic ink screen is greatly reduced, so that no color loss exists during display, and the resolution ratio 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 disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.

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

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

Fig. 3 is a diagram showing a correspondence relationship between sub-color blocks and sub-pixel areas of a display module according to the related art.

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

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

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

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

Fig. 8 is a partial view of a cross-sectional structure of a display module according to an embodiment of the present 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 color block, 1072-green color block, 1073-blue 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;

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

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many 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 the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof 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" are used in this specification to describe the relative relationship of one component of an icon to another component, these terms are used in this specification for convenience only, such as in terms of the orientation of the examples described in the figures. It will be appreciated that if the device of the icon is flipped upside down, the recited "up" component will become the "down" component. 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 through another structure.

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

An electronic paper display (Electronic paper display, EPD) is a paper-like display, which operates on the principle that black particles and white particles of an electronic ink screen are subjected to electrophoresis under the action of a voltage, thereby forming black and white colors. The electronic paper display is relatively single in color at present and is only suitable for narrower commercial display markets, along with the fact that eye protection factors become education industry standards which are more and more important, the necessity of increasing color of eye protection of the electronic paper display is enhanced, and in addition, the demand of common consumers for color cartoon reading and drawing book reading is also more and more strong. Therefore, a color electronic paper display is proposed, and the current color electronic paper display realizes color display by multicolor particle and color printing (print color) technology, which requires 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 screen 103, a first bonding layer 104, a substrate 105, a second bonding 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 screen 103 is disposed on one side of the buffer layer 102 away from the array substrate 101, the first bonding layer 104 is disposed on one side of the electronic ink screen 103 away from the array substrate 101, the second bonding layer 106 is disposed on one side of the first bonding layer 104 away from the array substrate 101, the color filter layer 107 is disposed on one side of the second bonding 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 the electronic ink screen 103 on the array substrate 101, and the 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, where 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 three adhesive layers 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 enhance the light reflection effect, especially in the case of poor ambient light.

The light emitted by the electronic ink screen 103 is filtered by the color filter layer 107, so that a color display effect can be achieved, the color filter layer 107 is set 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 area 113, so that color loss is relatively serious in 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 thickness of the color filter layer 107 is reduced, the layer structure between the color filter layer 107 and the electronic ink screen 103 is simplified, printed RGB color blocks 1070 are directly fabricated on the substrate 105, the color filter layer 107 is formed, and a waterproof film 114 is disposed on a 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 area 113 by the high-precision alignment device, so that the display effect is improved. The color filter layer 107 needs to be bonded by the first bonding layer 104. The manufacturing process of the display module is complex, and the alignment requirement is complex.

As shown in fig. 3 and 4, in the display module according to the above embodiment, in order to meet the alignment and display requirements, colorization is generally achieved by using one RGB color block in combination with a plurality of pixels. One sub-color block of the RGB color blocks 1070 corresponds to three sub-pixel regions 113, that is, one RGB color block 1070 corresponds to nine sub-pixel regions 113, wherein three sub-color blocks of different colors in the lateral direction form one RGB color block 1070, three sub-color blocks of different colors in the longitudinal direction form one RGB color block 1070, and a plurality of RGB color blocks 1070 are sequentially arranged in the lateral direction and the longitudinal direction, respectively. It can be found that the area of the sub-color patch is smaller than the areas 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 sacrifices resolution and pixel density (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 the drain of the thin film transistor 1011 is connected to the pixel electrode 1014 to change an electric field between the pixel electrode 1014 and a common electrode (not shown in the drawing), thereby forming a plurality of sub-pixel regions. By driving each thin film transistor, the corresponding sub-pixel region emits light and passes through the RGB color block 1070 corresponding to the sub-pixel region, thereby displaying a color image to be displayed.

The embodiment of the disclosure provides a 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, where the substrate 201 has a first surface and a second surface that are oppositely disposed, and the second surface is a display surface of the display module; the substrate 201 is formed with a pixel array, the pixel array includes a plurality of sub-pixel regions 213, the plurality of thin film transistors 214 are respectively disposed in each sub-pixel region 213, the plurality of pixel electrodes 209 are respectively disposed in each sub-pixel region 213 and connected to the drain electrode 205 of the thin film transistor 214, the electronic ink screen 210 is disposed on a side of the pixel electrode 209 away from the substrate 201, and the common electrode 211 is disposed on a side of the electronic ink screen 210 away from the pixel electrode 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 electronic ink screen 210 is a color electronic ink screen.

The light is incident to the electronic ink screen 210 through the substrate 201, the light reflected by the electronic ink screen 210 forms a display screen, the display screen is displayed through the second surface of the substrate 201, and the user can watch the display screen in the direction facing the second surface, so that the user can see the colorful screen.

The substrate is directly used as the light guide plate, and the light guide plate is not required to be arranged independently, so that the thickness of the display module is reduced. The display module can be provided with 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 monochrome block in the color filter layer 208 can be set to be the same as the size of one sub-pixel area 213, and one sub-pixel area 213 is aligned with one monochrome block. The distance between the color filter layer 208 and the electronic ink screen 210 is greatly reduced, so that no color is lost during display, and the resolution is high. Therefore, the display module has better display effect.

The array substrate with the color filter layer 208 can be formed by disposing the color filter layer 208 on the thin film transistor 214 by photolithography, and the common electrode is usually a whole layer attached to the side of the electronic ink screen 210 away from the substrate 201, and is usually integrally formed at the time of shipping. Therefore, when the reflective electronic paper display module is manufactured, the electronic ink screen 210 with the common electrode is only required to be assembled with the array substrate with the color filter layer 208, so that the reflective electronic paper display module is efficient, convenient and high in production efficiency.

It will be appreciated that the user may also view from a direction facing the first side of the substrate 201, looking at the black and white picture corresponding to the color picture.

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, wherein the gate electrode 202 is disposed on a first surface of the substrate 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 201, the active layer 204 is disposed on a side of the gate insulating layer 203 away from the substrate 201, the source electrode 205 is disposed on a side of the active layer 204 away from the substrate 201, the source electrode 205 is connected to the active layer 204 and is 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 201, and the drain electrode 206 is connected to the active layer 204 and is 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 via a data line connected thereto.

The drain electrode 206 is connected to the pixel electrode 209, which will be described in detail below. The color filter layer 208 is provided with a plurality of first vias corresponding to the pixel electrodes one by one. The pixel electrode is connected to the drain electrode 206 through the first via hole. The thin film transistor may further include a protection layer 207, the protection layer 207 is disposed on a side of the source electrode 205 and the drain electrode 206 away from the substrate 201, a second via hole communicating with the first via hole is disposed on the protection layer 207, and the pixel electrode sequentially passes through the first via hole and the second via hole to be connected with the drain electrode 206. It will be appreciated that the thin film transistors, the pixel electrodes and the sub-pixel regions 213 are in one-to-one correspondence.

The color filter layer 208 may be directly formed as an insulating layer on a side of the source electrode 205 and the drain electrode 206 away from the substrate 201 by a technique of forming a color filter layer (COA) on a thin film transistor (Thin Film Transistor, TFT). A color filter layer 208 can be further arranged on one side of the protective layer 207 away from the substrate 201, and the protective layer is added to enable the data line to be far away from the pixel electrode, so that the data line and the pixel electrode cannot be affected mutually, the area of the pixel electrode can be maximized, and the display uniformity and the display effect are improved. Meanwhile, the thickness between the dielectric materials between the thin film transistor 214 and the pixel electrode 209 is increased by the protective layer 207, and the compressive capacity of the display module is improved, so that the product yield of the display module is improved.

It should be noted that, whether 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 substrate 201, or the color filter layer 208 is formed on the side of the protective layer 207 away from the substrate 201, the color filter layer 208 may be formed on the thin film transistor 214 by photolithography using an exposure machine, the process is relatively simple, and the accuracy of the RGB color patch 2080 and the alignment accuracy of the sub-pixel region 213 may be ensured.

In other embodiments, the color filter layer 208 may 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 photo-etched on a side of the insulating layer away from the substrate 201, so that the distance between the color filter layer 208 and the electronic ink screen 210 may be further reduced, the color loss during display may be further reduced, and the resolution may be improved. However, the thickness of the display module is increased due to the additional insulating layer.

As shown in fig. 6, the color filter layer 208 includes a plurality of RGB color blocks 2080, and each RGB color block 2080 includes three sub-color blocks of different colors, namely: red, green, and blue color sub-blocks 2081, 2082, 2083, wherein blue color sub-block 2083 is shown, red and green color sub-blocks 2081, 2082 are only partially shown, but the cross-sectional sizes of the three different color sub-blocks are uniform. Each sub-color block is provided with a first via hole, the pixel electrode passes through the first via 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 block may correspond to three sub-pixel areas 213. It will be appreciated that the sub-pixel regions 213 have a smaller area, and thus a higher resolution and pixel density, which is advantageous for improving the fineness of the colorized display. On this basis, the area of the sub-pixel region 213 can be further reduced, the RGB color blocks can be adaptively made smaller, and the fineness of the colorized display can be further improved.

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

If color display is to be realized according to the requirements, the black particles and the white particles in the microcapsules corresponding to the sub-color blocks of different colors are controlled to move to the pixel electrode or the common electrode 211 according to the electric field direction, so that the 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 the light incident from the outside to be in a dark state, the white particles reflect the incident 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 a light source, so that the display module can be used under the condition of no external light. The light source is generally arranged on the side surface of the display module, the substrate serves as a light guide plate, and light emitted by the light source is reflected by the substrate and then enters the electronic ink screen. Even if the display module is used under the condition of darker ambient light, the display module is not influenced basically, and the display effect of the display module can be improved.

The electronic ink 210 may be adhered to the pixel electrode 209 by a transparent conductive adhesive, and the common electrode 211 is generally integrally formed with the electronic ink 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 display effects. The common electrode 211 may be generally made directly of metal to achieve a light reflecting effect. In addition, a package substrate (not shown) may be disposed on a side of the common electrode 211 remote from the substrate 201, and the package substrate may be adhered to the common electrode 211 by an optically transparent adhesive.

The user can also watch the black-and-white picture corresponding to the color picture facing the side of the package substrate away from the substrate 201. The common electrode 211 may be a transparent conductive film as needed 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 may be bent according to the display requirement, so as to achieve the curved display effect.

The second surface of the substrate 201 is a display surface of the display module, and the transmittance thereof is lost to some extent. Specifically, the pixel electrodes 209, the tfts 214 and the wirings thereof may cause a certain loss of the transmittance of the display module, and in addition, the storage capacitor may also cause a certain loss of the transmittance of the display module due to the need of a larger storage capacitor of the display module.

In order to prevent the above problem, the structures of the storage capacitor and the thin film transistor can 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 this embodiment, the storage capacitor electrode is located between the substrate base and the thin film transistor.

Specifically, the storage capacitor electrode 212 may be disposed between the gate electrode 202 and the substrate 201, where the storage capacitor electrode 212 is in direct contact with the gate electrode 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 electrode 202 can be fabricated using the same set of equipment and process, thereby saving cost and improving efficiency.

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

It should be emphasized that the pixel electrode 209 and the storage capacitor electrode 212 are made of transparent conductive films, for example, a material of the pixel electrode 209 and the storage capacitor electrode 212 may be Indium Tin Oxide (ITO). In this way, the setting of the storage capacitor is completed, and the influence of the storage capacitor and the pixel electrode 209 on the transmittance of the display module is eliminated.

On the basis of the above, as shown in fig. 8, it is also possible to reduce the size of the thin film transistor and thin the wiring. It can be seen that the front projection of the thin film transistor on the pixel electrode occupies the width of the pixel electrode, the front projection of the gate line 215 connected to the gate electrode occupies the width of the pixel electrode, and the front projection of the data line 216 connected to the source or drain electrode occupies the width of the pixel electrode, which are relatively close, and the gate line and the data line are usually located in the non-display area of the display module, so that the thin film transistor is almost located in the non-display area of the display module. It can be understood that the thin film transistor and the lead thereof have smaller transmittance loss on the display module and even have no influence on the transmittance of the display module.

Through 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 side of the source electrode 205 and the drain electrode 206 away from the substrate 201, and the filter layer 208 may also have the insulating function of the protective layer 207.

When the transmittance of the display module is 50%, the back of the display module can primarily see the display picture, and the display picture on the back is darker because the transmittance of the display module is not high. After the transmissivity is improved, the back of the display module can obtain a display effect very close to the front of the display module with the transmissivity of 50%, and the display effect is good.

The display module is generally applied to consumer electronic products. The electronic product is generally provided with the light source on the display surface, and is generally arranged on the side surface of the display module, the substrate is used as the light guide plate, and the light emitted by the light source is reflected by the substrate and then is incident to the electronic ink screen, so that the electronic ink screen is basically not influenced even if the environment light is darker, and the display effect of the display module can be improved.

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

The embodiment of the disclosure provides a display device, which may include the display module set described in any one of the above, and the structure of the display module set has been described in detail above, so that details are not repeated here.

It should be noted that, the display device includes other necessary components and components besides the display module, for example, a display, specifically, a housing, a circuit board, a power cord, etc., and those skilled in the art can correspondingly supplement the components and components according to the specific usage requirement of the display device, which is not described herein.

The display device may be a conventional electronic device, for example: cell phones, computers, televisions, and camcorders, but also emerging wearable devices, such as VR glasses, are not listed 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 201 is provided, the substrate 201 having a first face and a second face disposed opposite to each other.

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, a color filter layer 208 is formed on a side of the thin film transistor layer 214 away from the substrate 201, and a first via hole is disposed 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 electrode 206 of the thin film transistor layer 214 through the first via hole.

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

The display module can be provided with 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 monochrome block in the color filter layer 208 can be set to be the same as the size of one sub-pixel area 213, and one sub-pixel area 213 is aligned with one monochrome block. The distance between the color filter layer 208 and the electronic ink screen 210 is greatly reduced, so that no color is lost during display, and the resolution is high. Therefore, the display module has better display effect.

The method may further comprise:

step S10 further includes: the substrate is subjected to a pretreatment, 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 disposing process of one thin film transistor may include:

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

forming a gate insulating layer 203 on a side of the gate electrode 202 remote from the substrate 201;

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

a source/drain plating layer is formed on a side of the active layer 204 away from the substrate 201, the source/drain plating layer is patterned to form a plurality of source electrodes 205 and drain electrodes 206, and one source electrode 205 and one drain electrode 206 are respectively connected to one active layer 204.

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

Step 40 may include:

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

Each RGB color block 2080 includes a red color sub-block 2081, a green color sub-block 2082, and a blue color sub-block 2083, and first vias are formed in the red color sub-block 2081, the green color sub-block 2082, and the blue color sub-block 2083, respectively.

The RGB material is resin, so that the color filter layer 208 can be disposed on the thin film transistor 214 by photolithography, and compared with the method of attaching and aligning the color filter layer, the processing technology is simple and the alignment precision is high, the monochrome block in the color filter layer 208 can be set to be the same as the size of one sub-pixel area 213, and one sub-pixel area 213 is aligned with one monochrome block, and the processing technology is simple and the alignment precision is high.

Step S50 may include:

a pixel electrode plating layer is formed on a 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 by one, and each pixel electrode 209 sequentially passes through the first via hole and the second via hole to be connected with the drain electrode 206.

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

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 adaptations, 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.

Claims

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

the substrate is provided with a first surface and a second surface which are oppositely arranged, the second surface is a display surface of the display module, and the substrate is directly used as a light guide plate without independently arranging the light guide plate;

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

the thin film transistors are respectively arranged in the sub-pixel areas;

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

the electronic ink screen is positioned at one side of the pixel electrode far away from the substrate base plate;

the public 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 according to 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 provided on the color filter layer.

3. The reflective electronic paper display module of claim 1, further comprising a storage capacitor electrode, wherein a capacitance is formed between the storage capacitor electrode and the pixel electrode, and wherein 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 and the thin film transistor.

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

6. The reflective electronic paper display module according to claim 1, wherein the electronic ink screen comprises a transparent carrier and a plurality of microcapsules fixed in the transparent carrier, the microcapsules comprise a wrapping layer, transparent fluid is arranged in the wrapping layer, and black particles and white particles with different electrical properties are arranged in the transparent fluid.

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

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

providing a substrate, wherein the substrate is provided with a first surface and a second surface which are oppositely arranged, and the substrate is directly used as a light guide plate without independently arranging the light guide plate;

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

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

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

forming a pixel electrode in each sub-pixel region respectively, and connecting the pixel electrode with the drain electrode of the thin film transistor through the via 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 of claim 8, wherein the color filter layer is formed on a side of the thin film transistor away from the substrate by photolithography.

10. The method for manufacturing a reflective electronic paper display module according to claim 8, further comprising:

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