A full-surface foldable touch screen and its manufacturing method and application

A production method and touch screen technology, applied in the direction of instrumentation, calculation, electrical digital data processing, etc., can solve the problems of signal short circuit, short service life, easy cracking and damage of ITO, etc., so as to improve service life and stability, and solve problems The effect of resistance to bending and improving the effect of folding stability

Active Publication Date: 2021-06-11
常州第六元素半导体有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Existing touch screens basically use ITO as the conductive layer. Since ITO is not resistant to bending, it cannot be folded and used. Therefore, in the display field, ITO can only be used as an ideal material for flat display.
However, with the ever-changing changes in the display industry, the size of the flat display is getting larger and larger, which is very convenient to use, but it is very inconvenient to take and place because the screen is too large, so the curved display and foldable Display devices have become a popular research direction at present, and foldable devices can effectively reduce the space for picking up and placing devices while ensuring ease of use, and can significantly improve the convenience of use, thus becoming a recognized future display trend. Display devices The foldable of the display mainly includes two parts, the foldable display and the foldable touch screen on the surface of the display. The foldable research of the display, including Samsung and LG, are at the forefront, and there are corresponding prototypes available. The most important interface for interaction—on the foldable touch screen, there is still no good way to realize the foldable. One of the main reasons is that the current touch screen is basically made of ITO, and ITO is easy to crack and break, and cannot withstand more than 90 The inward bending of more than 30 degrees, and the outward bending of more than 30 degrees will easily crack and damage the ITO
[0003] For example, the foldable display device introduced in patent No. CN105324807A / CN105810104A etc. is actually two display screens, and the two display screens are on the same plane when in use through the bending device in the middle, and can be folded in half when not in use, and can be foldable device, but in fact it only forms a folding effect through external mechanical parts, and cannot really realize the complete folding of the entire screen
This kind of structure that requires a bending device in the middle is complicated, the process is complicated, and the problem of signal short circuit between the two display screens is prone to occur, and the service life is short
[0004] Patent No. CN106373490 introduces a foldable device, which can realize inward and outward 180-degree bending without adding other auxiliary devices, but does not explain the characteristics of the foldable touch screen used in the display device

Method used

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  • A full-surface foldable touch screen and its manufacturing method and application
  • A full-surface foldable touch screen and its manufacturing method and application
  • A full-surface foldable touch screen and its manufacturing method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] According to the shape of the foldable display device (such as figure 1 ) Design the corresponding touch screen shape (such as figure 2 ) and mark the folded area.

[0055] The process flow of ITO+graphene composite touch screen (i.e. the whole surface of the present invention can be bent touch screen) is as follows (such as Figure 5 ):

[0056] 1) Mark the area to be folded on the 25 micron thick ITO conductive film;

[0057] 2) transferring the single-layer graphene film at the marked folded region;

[0058] 3) The entire graphene + ITO conductive film is patterned by the laser direct writing process, so that the graphene as the metal lead area of ​​the touch sensor is removed, exposing the surface of the ITO conductive film, so that the metal lead can be overlapped with ITO;

[0059] 4) Print silver paste wires, so that the silver paste and the ITO conductive film overlap to form a complete touch circuit;

[0060] 5) Use laser direct writing patterning to patt...

Embodiment 2

[0063] According to the shape of the foldable display device (such as image 3 ) Design the corresponding touch screen shape (such as Figure 4 ) and mark the folded area.

[0064] The process flow of ITO+graphene composite touch screen is as follows (such as Image 6 ):

[0065] 1) Mark the area to be folded on the 50 micron thick ITO conductive film;

[0066] 2) transfer the bilayer graphene film at the marked folded region;

[0067] 3) The entire graphene + ITO conductive film is patterned by the laser direct writing process, so that the graphene as the metal lead area of ​​the touch sensor is removed, exposing the surface of the ITO conductive film, so that the metal lead can be overlapped with ITO;

[0068] 4) Print silver paste wires, so that the silver paste and the ITO conductive film overlap to form a complete touch circuit;

[0069] 5) Use laser direct writing patterning to pattern silver paste and other ITO and graphene coverage areas to form touch sensor patte...

Embodiment 3

[0072] According to the shape of the foldable display device (such as figure 1 ) Design the corresponding touch screen shape (such as figure 2 ) and mark the folded area.

[0073] The process flow of ITO+graphene composite touch screen is as follows (such as Figure 5 ):

[0074] 1) Mark the area to be folded on the 25 micron thick ITO conductive film (corresponding to the bending part of the ITO conductive layer, the same below);

[0075] 2) transferring the single-layer graphene film at the marked folded region;

[0076] 3) The entire graphene + ITO conductive film is patterned by the laser direct writing process, so that the graphene as the metal lead area of ​​the touch sensor is removed, exposing the surface of the ITO conductive film, so that the metal lead can be overlapped with ITO;

[0077] 4) Copper wire is sputtered, so that the copper wire overlaps with the ITO conductive film to form a complete touch circuit;

[0078] 5) Use laser direct writing patterning t...

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Abstract

The invention discloses a full-surface foldable touch screen and its preparation method and application, wherein, the full-surface foldable touch screen includes: a base film; an ITO conductive layer arranged on the surface of the base film, including a window area and a bending part And the edge lead area; the graphene layer arranged at the bending part of the ITO conductive layer; the electrode arranged at the edge lead area of ​​the ITO conductive layer and the lead area of ​​the overlapping part with the graphene layer. The invention can not only solve the adhesion problem of graphene film in the process of making touch sensor, but also solve the problem of bending resistance of ITO film in the process of making touch sensor, so as to improve the service life and stability of foldable touch sensor Combining the advantages of the two conductive films, using the graphene + ITO composite film, transfer part of the graphene on the ITO surface in the bending area of ​​the touch screen to enhance the bending resistance of the conductive layer in the bending area.

Description

technical field [0001] The invention relates to a display screen of a foldable display device, a preparation method thereof, and a corresponding display device. Background technique [0002] Existing touch screens basically use ITO as the conductive layer. Since ITO is not resistant to bending and cannot be folded, the current display field can only use ITO as an ideal material for flat display. However, with the ever-changing changes in the display industry, the size of the flat display is getting larger and larger, which is very convenient to use, but it is very inconvenient to take and place because the screen is too large, so the curved display and foldable Display devices have become a popular research direction at present, and foldable devices can effectively reduce the space for picking up and placing devices while ensuring ease of use, and can significantly improve the convenience of use, thus becoming a recognized future display trend. Display devices The foldable ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/041
CPCG06F3/041G06F2203/04103
Inventor 袁凯刘海滨谭化兵
Owner 常州第六元素半导体有限公司
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