Auxiliary Electrodes for Uniform Electric Field in In-Cell Touch Displays
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Solution Overview
Problem
In-cell touch display panels experience non-uniform display brightness due to the additional electric field created by bridge structures in the metal wiring, leading to differences in electric field distribution and brightness between regions with and without the bridge structure.
Innovation Solution
The implementation of an array substrate with a pixel electrode layer, a common electrode layer, and a wiring layer, where auxiliary electrodes are connected to the wiring and disposed above the common electrode blocks, ensuring the electric potential and electric field distribution are uniform across the display panel by eliminating the bridge structure's impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bridge structures are used to electrically connect wirings with common electrode blocks, then electrical connection is achieved, but non-uniform display brightness occurs due to additional electric field
Solution Approach 1:
The patent extracts and removes the bridge structures from the display panel to eliminate the additional electric field they create. By taking out these problematic connecting structures, the non-uniformity in electric field distribution and display brightness is resolved while maintaining electrical connection through alternative means.
Solution Approach 2:
The patent introduces a common electrode block as an intermediary element that can be electrically connected to wirings through alternative methods without requiring bridge structures. This intermediary approach allows electrical connection to be maintained while avoiding the creation of additional electric fields that cause brightness non-uniformity.
2Device complexity
If bridge structures are disposed in the same layer as pixel electrode, then wiring connection is simplified, but electric field distribution becomes non-uniform
Solution Approach 1:
The patent extracts bridge structures from the pixel electrode layer to eliminate their disruptive effect on electric field distribution. By removing these elements from the same layer as pixel electrodes, the electric field stability is restored while wiring connections are maintained through other means.
Solution Approach 2:
The patent resolves the layering conflict by changing the dimensional arrangement - instead of placing bridge structures in the same layer as pixel electrodes, the solution moves to alternative connection methods that do not occupy the same spatial dimension, thereby eliminating electric field interference while maintaining electrical connectivity.
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 configuration maintains uniform electric field distribution and brightness across the display panel, eliminating non-uniformity and enhancing the overall display quality.
Implementation Method 1
an additional electric field formed between the pixel electrode and the bridge structure is added to an existing electric field formed between the common electrode block and the pixel electrode
Data Source
AI summary
An array substrate, a touch display panel and a touch display device. The array substrate includes: a substrate; a pixel electrode layer; a common electrode layer, which comprises a plurality of common electrode blocks, wherein the common electrode blocks are operable as touch electrodes; a wiring layer, comprises a plurality of wirings, wherein each of the wirings is electrically connected with a corresponding one of the common electrode blocks, and at least one wiring is each overlapped with at least one common electrode block electrically insulated therefrom; and first bridge structures and auxiliary electrodes disposed in the pixel electrode layer, wherein each first bridge structure is configured for a connection between the wiring and the common electrode block, and each auxiliary electrode is connected with one of the wirings and disposed above the common electrode block insulated from and overlapped with the wiring.