Opposed Substrate Static Protection Segmentation for LCD Touch Panels
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Solution Overview
Problem
In capacitive touch screens integrated with ADS TFT-LCDs, the static electricity protective layer interferes with the capacitive touch layer, compromising touch sensitivity and display quality.
Innovation Solution
An opposed substrate with a static electricity protective electrode, a bridging electrode, and a touch induction electrode is designed, where the static electricity protective electrode is distributed in dummy regions between the touch induction electrode's sub-units, ensuring insulation and preventing large capacitance formation between the static electricity protective layer and the capacitive touch layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a static electricity protective layer (ITO layer) is deposited on the back surface of the color filter substrate, then display quality is improved by mitigating static electricity influence, but touch sensitivity is compromised due to large capacitance formation with the capacitive touch layer
Solution Approach 1:
The static electricity protective layer is segmented into multiple discrete electrode regions distributed across the substrate, rather than forming a continuous layer. These segmented electrodes are positioned in dummy regions between the touch induction electrode sub-units, creating spatial separation that reduces capacitance coupling while maintaining static protection functionality.
Solution Approach 2:
The static electricity protective electrode is strategically distributed in specific dummy regions between the touch induction electrode sub-units, rather than uniformly across the entire substrate. This local placement optimizes the balance between providing static protection where needed and minimizing interference with the capacitive touch layer.
2Measurement precision
If the static electricity protective layer is omitted to improve touch sensitivity, then touch response sensitivity is improved, but display quality deteriorates due to loss of static electricity protection
Solution Approach 1:
The continuous static electricity protective layer is divided into discrete segmented electrodes positioned in dummy regions. This segmentation allows the structure to provide static protection through distributed electrode coverage while minimizing the total overlapping area with the capacitive touch layer, thus preserving touch sensitivity.
Solution Approach 2:
The bridging electrode acts as an intermediary structure that connects the segmented static electricity protective electrodes while maintaining insulation from the touch induction electrode. This intermediary structure enables the static protective function to operate without directly interfering with the capacitive touch layer's electric field distribution.
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 high display quality while enhancing touch sensitivity by preventing static electricity interference and allowing for effective static charge release, thus ensuring both good touch effect and display quality.
Implementation Method 1
the static electricity protective electrode, the bridging electrode and the touch induction electrode are insulated from each other
Data Source
AI summary
An opposed substrate (9′) comprises: a substrate (1); a static electricity protective electrode (2), a bridging electrode (4) and a touch induction electrode (6) comprising a plurality of sub-units sequentially formed on the substrate (1), wherein the distribution of the static electricity protective electrode (2) on the substrate (1) corresponds to dummy regions between sub-units, and the static electricity protective electrode (2), the bridging electrode (4) and the touch induction electrode (6) are insulated from each other. The opposed substrate (9′) has a good touching effect. A method for manufacturing the opposed substrate, and a liquid crystal display touch panel are also disclosed.