Array Substrate Layout for In-Cell Touch Field Uniformity
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Solution Overview
Problem
In-Cell touch screens face issues with non-uniform electric fields and contaminants due to the arrangement of touch signal lines in the middle of sub-pixels, which affect the yield and quality of display products.
Innovation Solution
The array substrate design includes touch signal lines arranged in light shielding regions between sub-pixels, with metal pattern units overlapping the touch signal lines to create a stable electric field and reduce dependence on the black matrix for light shielding, thereby preventing contaminants and enhancing display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch signal lines are arranged in the middle of sub-pixels, then touch function is achieved, but non-uniform electric fields and contaminants occur leading to reduced display quality
Solution Approach 1:
The sub-pixel region is segmented into light-emitting region and light shielding region. Touch signal lines are relocated from the middle of sub-pixels to the light shielding regions, separating the touch signal transmission path from the light emission area, thereby eliminating electric field non-uniformity while preserving touch functionality.
Solution Approach 2:
The arrangement of touch signal lines transitions from a horizontal arrangement (in the middle of sub-pixels) to a vertical arrangement (in the light shielding regions between sub-pixels). This dimensional reorganization eliminates the harmful electric field effects while maintaining touch signal transmission.
2Object-affected harmful factors
If black matrix is used for light shielding, then light shielding is achieved, but manufacturing cost increases
Solution Approach 1:
The metal pattern units, which are already present for other functions, are made to serve dual purposes by providing light shielding properties. This eliminates the need for separate black matrix structures, reducing manufacturing steps and costs while achieving effective light shielding.
Solution Approach 2:
The metal pattern units are designed to perform multiple functions simultaneously: electrical connection for touch signals and light shielding. This multi-functionality eliminates the need for dedicated black matrix structures, simplifying manufacturing and reducing costs.
3Stability of the object's composition
If metal pattern units overlap touch signal lines, then electric field stability is improved, but device complexity increases
Solution Approach 1:
The metal pattern units are merged with the touch signal line structure, combining electrical connection and electric field stabilization functions into a single integrated component. This merging approach stabilizes the electric field without adding separate stabilization structures, thereby avoiding increased complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively shields touch signal lines and data lines, preventing non-uniform electric fields and contaminants, while reducing the light shielding area of the black matrix, thus improving the yield and quality of display products.
Implementation Method 1
an overlapping area between an orthogonal projection of the first metal strip onto the base substrate and an orthogonal projection of the touch signal line onto the base substrate is A, and a ratio of the overlapping area A to an area of the orthogonal projection of the touch signal line onto the base substrate is greater than a threshold
Implementation Method 2
metal pattern units corresponding to the sub-pixels respectively and each arranged in the light shielding region of the corresponding sub-pixel
Data Source
AI summary
The present disclosure provides an array substrate and a display device. The array substrate includes: a plurality of gate lines extending in a first direction, and a plurality of data lines extending in a second direction and crossing the gate lines to define a plurality of sub-pixels; a plurality of touch signal lines extending in the second direction and arranged in light shielding regions of the sub-pixels; a plurality of touch electrodes insulated from each other; and a plurality of metal pattern units corresponding to the sub-pixels respectively and arranged in the light shielding region of each sub-pixel. The metal pattern unit includes a first metal strip arranged on at least one side of the data line and extending in the second direction.