Electronic paper display screen, display device and bonding method

Abstract

The present invention relates to the field of display technology, and discloses an electronic paper display screen, a display device, and a bonding method to improve the substrate utilization rate of the electronic paper display screen, and improve the yield rate and service life of the electronic paper display screen. The electronic paper display screen includes a substrate, electronic paper, a bonding electrode, an electronic ink conduction structure, and a chip-on-film, wherein the substrate includes a display area and a bonding area, the electronic paper is arranged on one side of the display area of ​​the substrate, and the edge of the electronic paper close to the bonding area has an electronic ink conduction structure extending to the substrate bonding area; the chip-on-film is electrically connected to the substrate through the bonding electrode, and one end of the chip-on-film close to the display area is sandwiched between the substrate and the electronic ink conduction structure.

Description

[0001] Technology

[0002] The present invention relates to the field of display technology, and in particular to an electronic paper display screen, a display device and a bonding method. Background Art

[0003] Electronic paper display, also known as digital paper. It is an ultra-thin and ultra-light display, which can be understood as a "display as thin as paper, soft and rewritable". Generally, a type of display technology that can achieve comfortable reading like paper, ultra-thin and light, bendable, and ultra-low power consumption is called electronic paper technology; because it has the characteristics of paper, can switch to display different pictures for content display, and has low power consumption and foldable and bendable functions, delicate picture display and wide viewing angle. Compared with other display technologies, the biggest advantage is good visibility in sunlight and no dead angle. Domestic and foreign research institutions and enterprises are actively carrying out electronic paper research. The electronic paper display is embedded with electronic paper, which is in the form of a thin film, on which a layer of electronic ink is coated to form electronic paper. At present, the main ways to realize electronic paper technology include cholesterol liquid crystal display technology, electrophoretic display technology (EPD) and electrowetting display technology, among which electrophoretic display technology is the most promising technical approach.

[0004] Electronic ink is actually a new type of liquid material that can be printed on the surface of any material to display text or image information. In this liquid material, there are hundreds of microcapsules about the same size as the diameter of a human hair, each of which is composed of positively charged particles and negatively charged particles. As long as a certain process is adopted, this electronic ink can be printed on the surface of glass, fiber or even paper medium to form electronic paper. Of course, these carriers that carry electronic ink also need to be specially processed, and a simple pixel control circuit is constructed for each pixel in it, so that the electronic ink can display the images and text we need. Electronic ink technology can make any surface an electronic paper display screen. It allows us to completely jump out of the conceptual constraints of the original display device and slowly penetrate into every corner of our living space. However, the existing electronic paper display screen still has slow response speed, slow conversion speed, complex manufacturing process, and is easily affected by the environment (water vapor, oxygen and other factors), resulting in low yield, poor display effect, and short life of good products. Therefore, how to improve the life and precise bonding of flexible electronic paper display screens and provide better visual display has always been a hot topic of research at home and abroad. Summary of the invention

[0005] The present invention provides an electronic paper display screen, a display device and a bonding method, so as to improve the utilization rate of a substrate of the electronic paper display screen, and improve the yield rate and service life of the electronic paper display screen.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] An electronic paper display screen comprises a substrate, electronic paper, bonding electrodes, an electronic ink conduction structure and a chip-on-chip film, wherein the substrate comprises a display area and a bonding area located at least on one side of the display area and adjacent to the display area, the display area of ​​the substrate is provided with electronic paper, and an edge of the electronic paper close to the bonding area has an electronic ink conduction structure extending to the bonding area of ​​the substrate; the chip-on-chip film is electrically connected to the bonding electrodes, and one end of the chip-on-chip film close to the display area is sandwiched between the substrate and the electronic ink conduction structure.

[0008] The electronic paper display screen provided by the embodiment of the present invention has an electronic ink conduction structure in the bonding area, and the end of the chip-on-chip film close to the display area is sandwiched between the substrate and the electronic ink conduction structure, and the electronic paper is connected to the chip-on-chip film and the bonding electrode on the substrate through the electronic ink conduction structure to form a path. The end of the chip-on-chip film close to the display area is sandwiched between the substrate and the electronic ink conduction structure, which can improve the substrate utilization rate of the electronic paper display screen, and improve the yield rate and service life of the electronic paper display screen.

[0009] Preferably, the electronic paper and electronic ink conductive structure has a transparent electrode layer on a side away from the substrate, the electronic ink conductive structure has a slot, and the transparent electrode layer is retained at the slot.

[0010] Optionally, the electronic ink conductive structure includes a plurality of terminal electrodes distributed at intervals, and one end of the chip-on-film close to the display area is sandwiched between the substrate and the plurality of terminal electrodes at the edge of the electronic paper.

[0011] Preferably, the electronic paper and the terminal electrode have a transparent electrode layer on a side away from the substrate, a slot is formed on the terminal electrode, and the transparent electrode layer is retained at the slot.

[0012] Preferably, the substrate is hollowed out in an area corresponding to the orthographic projections of the multiple terminal electrodes on the substrate, the chip-on-chip film is arranged in the hollowed-out area of ​​the substrate and the spacing area of ​​the multiple terminal electrodes, and the chip-on-chip films in the hollowed-out area and the spacing area are not in the same plane and are staggered.

[0013] Preferably, the slot is filled with conductive glue, and the conductive glue is in contact with the transparent electrode layer at the slot.

[0014] Preferably, a first protective film is attached to a surface of the electronic paper away from the substrate, and a second protective film is attached to a surface of the substrate away from the electronic paper; and the first protective film and the second protective film are box-sealed.

[0015] Preferably, a portion of the bonding area corresponding to the first protective film and the second protective film is filled with frame sealing glue, and the edge of the first protective film and the second protective film where the box is sealed are filled with frame sealing glue.

[0016] Preferably, the substrate is a flexible substrate, and the bonding electrodes are flexible bonding electrodes.

[0017] The embodiment of the present invention also provides an electronic paper display screen bonding method, comprising the following steps:

[0018] Step S1: forming electronic paper in the display area of ​​the substrate;

[0019] Step S2: forming a bonding electrode in the bonding area of ​​the substrate;

[0020] Step S3: forming an electronic ink conductive structure on an edge of the electronic paper close to the bonding area, wherein the electronic ink conductive structure has a slot;

[0021] Step S4: sandwiching one end of the chip-on-film close to the display area between the substrate and the electronic ink conductive structure, and the chip-on-film is electrically connected to the substrate through the bonding electrode.

[0022] The embodiment of the present invention provides an electronic paper display bonding method, which is applied to the above-mentioned electronic paper display, can improve the substrate utilization rate of the electronic paper display product, and improve the yield and service life of the electronic paper display.

[0023] An embodiment of the present invention further provides an electronic paper display device, comprising the above-mentioned electronic paper display screen.

[0024] The electronic paper display device provided by the embodiment of the present invention includes the above-mentioned electronic paper display screen, which can also improve the substrate utilization rate of the electronic paper display screen and improve the yield rate and service life of the electronic paper display screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the structure of an electronic paper display screen provided by an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of the three-dimensional structure of an electronic paper display screen provided by an embodiment of the present invention;

[0027] Figure 3 A schematic diagram of the structure of an electronic paper display screen provided by another embodiment of the present invention;

[0028] Figure 4 A schematic structural diagram of an electronic paper display screen provided by another preferred embodiment of the present invention;

[0029] Figure 5A schematic diagram of a structure in which a chip-on-chip film of an electronic paper display screen provided in another preferred embodiment of the present invention is arranged in a step-difference manner;

[0030] Figure 6 A top view of an electronic paper display screen provided by an embodiment of the present invention;

[0031] Figure 7 A schematic cross-sectional view of an electronic paper display screen taken along the line aa provided by an embodiment of the present invention;

[0032] Figure 8 A schematic cross-sectional view of an electronic paper display screen taken along the line bb provided by an embodiment of the present invention;

[0033] Fig. 9 A schematic cross-sectional view of an electronic paper display screen provided by an embodiment of the present invention;

[0034] Fig.10 A flow chart of an electronic paper display screen bonding method provided in an embodiment of the present invention.

[0035] Reference numerals:

[0036] 1-Substrate

[0037] 2-Electronic paper

[0038] 3-Bonding Electrode

[0039] 4-Chip-on-chip film

[0040] 5-Electronic ink conduction structure

[0041] 51-Slot

[0042] 52-Terminal electrode

[0043] 61-First protective film

[0044] 62-Second protective film

[0045] 7-Sealing glue

[0046] 8-Conductive glue

[0047] 9-Printed Circuit Board

[0048] 10- Transparent electrode layer

[0049] AA-Display Area

[0050] BA-Bonding Area DETAILED DESCRIPTION

[0051] In order to improve the substrate utilization rate of the electronic paper display screen, and to increase the yield rate and service life of the electronic paper display screen, the embodiments of the present invention provide an electronic paper display screen, a display device and a bonding method. In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention is further described in detail with reference to the following embodiments.

[0052] refer to Figure 1 and Figure 2 A display panel detection device provided by an embodiment of the present invention includes a substrate 1, an electronic paper 2, a bonding electrode 3, an electronic ink conductive structure 5 and a flip chip film 4, wherein the substrate 1 includes a display area AA and a bonding area BA located at least on one side of the display area AA and adjacent to the display area AA, the electronic paper 2 is arranged on one side of the display area AA of the substrate 1, and the edge of the electronic paper 2 close to the bonding area BA has an electronic ink conductive structure 5 extending to the bonding area BA of the substrate 1; the bonding area BA of the substrate 1 is also provided with a bonding electrode 3, the flip chip film 4 is electrically connected to the bonding electrode 3, and the end of the flip chip film 4 close to the display area AA is sandwiched between the substrate 1 and the electronic ink conductive structure 5.

[0053] The electronic paper display screen provided by the embodiment of the present invention has an electronic ink conduction structure in the bonding area, and the end of the chip-on-chip film close to the display area is sandwiched between the substrate and the electronic ink conduction structure, and the electronic paper is connected to the chip-on-chip film and the bonding electrode on the substrate through the electronic ink conduction structure to form a path. The end of the chip-on-chip film close to the display area is sandwiched between the substrate and the electronic ink conduction structure, which can improve the substrate utilization rate and internal structure stability of the electronic paper display screen, thereby improving the yield rate and service life of the electronic paper display screen.

[0054] The electronic paper in the embodiment of the present invention is the main display element used in the electronic paper display screen. The electronic paper is a thin film with an electronic ink coating on the surface. Hundreds of microcapsules with a diameter similar to that of a human hair are suspended in the electronic ink. Each microcapsule is composed of positively charged particles and negatively charged particles. The electronic paper can display images by dividing the above-mentioned large number of microcapsules into different pixel units and cooperating with the pixel control circuit in the chip-on-film.

[0055] In the preferred embodiment of this embodiment, reference is made to Figure 1 and Figure 2In the embodiment of the present invention, the electronic paper 2 and the electronic ink conductive structure 5 of the electronic paper display screen have a transparent electrode layer 10 on the side away from the substrate 1, and the electronic ink conductive structure 5 is provided with a slot 51, and the transparent electrode layer 10 is retained at the slot 51. The slot is formed on the electronic ink conductive structure of the electronic paper. In order to conduct the transparent electrode layer on the surface of the electronic paper, the substrate is hollowed out to form the slot, but the transparent electrode layer on the surface is retained at the hollowed-out position, thereby providing a fixed node and a conduction point for the electronic paper display screen at the same time, further improving the substrate utilization rate of the electronic paper display screen.

[0056] In another embodiment of the present invention, Figure 3 As shown, the electronic ink conduction structure 5 of the electronic paper display screen includes a plurality of terminal electrodes 52 distributed at intervals, and the end of the chip-on-chip film 4 close to the display area AA is sandwiched between the substrate 1 and the plurality of terminal electrodes 52 at the edge of the electronic paper. In this embodiment, the electronic ink conduction structure is arranged in the form of a plurality of terminal electrodes, so that the chip-on-chip film is cross-clamped by the plurality of terminal electrodes and the substrate, which can further improve the structural stability of the electronic paper display screen on the basis of improving the substrate utilization rate of the electronic paper display screen, thereby improving the yield rate and service life of the electronic paper display screen. Figure 3 The terminal electrode 52 shown is arranged on one side of the electronic paper 2 is only an example and should not be understood as limiting the present invention. The terminal electrode can be selectively arranged according to the orientation of the bonding area BA of the electronic paper display screen, such as Figure 4 As shown, the display area AA of the electronic paper 2 has evenly bonded areas BA on both sides, and the terminal electrodes 52 are disposed in both bonding areas BA.

[0057] In another preferred embodiment, reference Figure 3 , Figure 4 and Fig. 9 The electronic paper 2 and the end electrode 52 of the electronic paper display screen have a transparent electrode layer 10 on the side away from the substrate 1, and a slot 51 is opened on the end electrode 52, and the transparent electrode layer 10 is retained at the slot 51. Figure 7 and Fig. 9 As shown, the slot 51 of the electronic paper display is filled with conductive glue 8. In order to conduct the electronic paper and the transparent electrode layer on the surface of the terminal electrode, the substrate at the terminal electrode is hollowed out to form a slot, but the transparent electrode layer on the surface is retained at the hollowed-out position, thereby providing a fixed node and a conduction point for the electronic paper display at the same time, further improving the substrate utilization rate of the electronic paper display.

[0058] Further, refer to Figure 5, the substrate 1 is hollowed out in the area corresponding to the orthographic projection of the plurality of terminal electrodes 52 on the substrate 1, and the chip-on-cover film 4 is arranged in the hollowed-out area of ​​the substrate 1 and the spaced area of ​​the plurality of terminal electrodes 52, and the chip-on-cover film 4 in the hollowed-out area and the spaced-out area is not on the same plane and is staggered. In this embodiment, the plurality of terminal electrodes and the substrate in the electronic ink conduction structure are cross-woven to clamp the chip-on-cover film, and the chip-on-cover film in the hollowed-out area and the spaced-out area is staggered in a step-difference arrangement, thereby further improving the stability of the chip-on-cover film clamped by the plurality of terminal electrodes and the substrate, and also improving the space utilization inside the electronic paper display screen, thereby improving the substrate utilization, yield rate and service life of the electronic paper display screen of the embodiment of the present invention.

[0059] In the electronic paper display provided in the embodiment of the present invention, reference Figure 7 and Fig. 9 The slot 51 of the electronic paper display is filled with conductive glue 8, and the conductive glue 8 is in contact with the transparent electrode layer 10 at the slot 51. The side of the chip-on-chip film 4 also has an external bonding connection element printed circuit board 9. The conductive glue allows the electronic paper to be electrically connected to the chip-on-chip film through the electronic ink conductive structure to form a path; the bonding electrode on the substrate is electrically connected to the chip-on-chip film to form a path. Figure 6 , Figure 7 and Figure 8 , the electronic paper display screen of the embodiment of the present invention has a first protective film 61 attached to the surface of the side of the electronic paper 2 away from the substrate 1, and the second protective film 62 attached to the surface of the side of the substrate 1 away from the electronic paper 2; and the first protective film 61 and the second protective film 62 are box-encapsulated. The present invention does not specifically limit the material of the protective film, and preferably adopts a transparent organic resin material to effectively protect and fix the electronic paper display screen, and the second protective film of the electronic paper display screen of the present invention preferably adopts a double-layer protective film, which further improves the packaging effect of the electronic paper display screen of the present invention and can isolate the influence of external water vapor and oxygen on internal components. Further, the portion of the bonding area BA corresponding to the first protective film 61 and the second protective film 62 of the outer layer of the electronic paper display screen is filled with a frame sealant 7, and the edge of the first protective film 61 and the second protective film 62 is filled with a frame sealant 7 at the box-encapsulation. The frame sealant further improves the structural stability and sealing of the electronic paper display screen of the embodiment of the present invention. And the substrate in the electronic paper display screen is preferably a flexible substrate, and the bonding electrode is preferably a flexible bonding electrode. The electronic paper display screen has a flexible bending function and can be applied to the working environment of a flexible display screen.

[0060] The embodiment of the present invention also provides an electronic paper display screen bonding method, such as Fig.10 As shown, the following steps are included:

[0061] Step S1: forming electronic paper in the display area of ​​the substrate;

[0062] Step S2: forming a bonding electrode in the bonding area of ​​the substrate;

[0063] Step S3: forming an electronic ink conductive structure on an edge of the electronic paper close to the bonding area, wherein the electronic ink conductive structure has a slot;

[0064] Step S4: sandwiching one end of the chip-on-film close to the display area between the substrate and the electronic ink conductive structure, and the chip-on-film is electrically connected to the substrate through the bonding electrode.

[0065] The embodiment of the present invention provides an electronic paper display bonding method, which is applied to the above-mentioned electronic paper display, can improve the substrate utilization rate of the electronic paper display product, and improve the yield and service life of the electronic paper display.

[0066] The embodiment of the present invention further provides an electronic paper display device, including the electronic paper display screen described above. The electronic paper display device provided by the embodiment of the present invention includes the electronic paper display screen described above, which can also improve the substrate utilization rate of the electronic paper display screen, and improve the yield rate and service life of the electronic paper display screen.

[0067] Obviously, those skilled in the art may make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An electronic paper display screen, characterized in that: include: A substrate, wherein the substrate comprises a display area and a bonding area located at least on one side of the display area and adjacent to the display area; Electronic paper, arranged in the display area of ​​the substrate; An electronic ink conductive structure, located at an edge of the electronic paper close to the bonding area and extending to the bonding area of ​​the substrate; A bonding electrode is disposed in a bonding area of ​​the substrate; A chip-on-chip film, the chip-on-chip film is electrically connected to the bonding electrode and the chip-on-chip film is in direct contact with the bonding electrode, and one end of the chip-on-chip film close to the display area is sandwiched between the substrate and the electronic ink conductive structure, and the chip-on-chip film is in direct contact with the electronic ink conductive structure; a printed circuit board of an external bonding connection element is disposed on the side of the chip-on-chip film; The electronic paper is connected to the chip-on-film and the bonding electrodes on the substrate through the electronic ink conductive structure to form a path.

2. The electronic paper display according to claim 1, characterized in that: The electronic paper and electronic ink conducting structure has a transparent electrode layer on a side away from the substrate, the electronic ink conducting structure is provided with slots, and the transparent electrode layer is retained at the slots.

3. The electronic paper display screen according to claim 1, characterized in that: The electronic ink conduction structure comprises a plurality of terminal electrodes distributed at intervals, and one end of the chip-on-chip film close to the display area is sandwiched between the substrate and the plurality of terminal electrodes at the edge of the electronic paper.

4. The electronic paper display screen according to claim 3, characterized in that: The electronic paper and the end electrode have a transparent electrode layer on a side away from the substrate, a slot is opened on the end electrode, and the transparent electrode layer is retained at the slot.

5. The electronic paper display screen according to claim 3, characterized in that: The substrate is hollowed out in areas corresponding to the orthographic projections of the multiple terminal electrodes on the substrate, and the flip chip film is arranged in the hollowed-out area of ​​the substrate and the spacing area of ​​the multiple terminal electrodes, and the flip chip films in the hollowed-out area and the spacing area are not on the same plane and are staggered.

6. The electronic paper display according to claim 2 or 4, characterized in that: The slot is filled with conductive glue, and the conductive glue is in contact with the transparent electrode layer at the slot.

7. The electronic paper display screen according to claim 1, characterized in that: A first protective film is attached to a surface of the electronic paper away from the substrate, and a second protective film is attached to a surface of the substrate away from the electronic paper; and the first protective film and the second protective film are sealed in a box.

8. The electronic paper display screen according to claim 7, characterized in that: The portion between the first protective film and the second protective film corresponding to the bonding area is filled with frame sealing glue, and the edge portions of the first protective film and the second protective film where they are sealed to the box are filled with frame sealing glue.

9. The electronic paper display screen according to claim 1, characterized in that: It also includes that the substrate is a flexible substrate, and the bonding electrode is a flexible bonding electrode.

10. A method for bonding an electronic paper display screen, characterized in that: include: forming electronic paper in a display area of ​​the substrate; forming a bonding electrode in a bonding area of ​​the substrate; An electronic ink conductive structure is formed on an edge of the electronic paper near the bonding area, wherein the electronic ink conductive structure has a slot; One end of the chip-on-chip film close to the display area is clamped between the substrate and the electronic ink conductive structure, and the chip-on-chip film is electrically connected to the substrate through the bonding electrodes and is in direct contact with the bonding electrodes, and the chip-on-chip film is in direct contact with the electronic ink conductive structure; an external bonding connection element printed circuit board is arranged on the side of the chip-on-chip film; wherein the electronic paper is connected to the chip-on-chip film and the bonding electrodes on the substrate through the electronic ink conductive structure to form a pathway.

11. An electronic paper display device, characterized in that: It comprises the electronic paper display screen as claimed in any one of claims 1 to 9.

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