Array Substrate with Composite Electrodes for Signal Delay Reduction
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Solution Overview
Problem
Capacitive in-cell touch technology experiences signal delay due to the relatively high resistance of common electrodes made of transparent metal oxides like ITO or IZO, which affects the performance of touch driving electrodes in advanced super dimension switch (ADS)-mode liquid crystal panels.
Innovation Solution
The array substrate incorporates a common electrode layer partitioned into touch driving electrodes and common electrodes arranged alternately, with metal wires connecting adjacent touch driving sub-electrodes in series or parallel, reducing the resistance and overlapping area with touch sensing electrodes to minimize signal delay and improve touch performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If common electrodes are made of transparent metal oxide (ITO or IZO), then transparency is maintained, but resistance is relatively high causing signal delay
Solution Approach 1:
The patent uses a composite electrode structure combining transparent metal oxide (ITO or IZO) with metal materials. The common electrode layer includes a first common electrode made of transparent metal oxide and a second common electrode made of metal material, creating a composite structure that achieves both transparency and low resistance, thereby resolving the contradiction between maintaining transparency and reducing signal delay.
Solution Approach 2:
The patent changes the material parameters of the common electrode by introducing a dual-layer structure with different material compositions. The first layer uses transparent metal oxide for optical properties, while the second layer uses metal material for electrical properties, optimizing both transparency and resistance parameters simultaneously.
2Reliability
If common electrode resistance is reduced by using metal materials, then signal delay is reduced, but transparency deteriorates
Solution Approach 1:
The patent employs a composite electrode structure where the first common electrode (transparent metal oxide) and second common electrode (metal material) are stacked together. This composite design allows the transparent layer to maintain optical properties while the metal layer provides low resistance, effectively resolving the trade-off between transparency and signal delay reduction.
Solution Approach 2:
The common electrode is segmented into two distinct functional layers: the first common electrode made of transparent metal oxide for maintaining transparency, and the second common electrode made of metal material for reducing resistance. This segmentation allows each layer to optimize its specific function without compromising the other.
3Reliability
If touch driving electrodes are divided into sub-electrodes, then resistance is reduced, but device complexity increases
Solution Approach 1:
The touch driving electrode is divided into multiple touch driving sub-electrodes (first, second, third, and fourth sub-electrodes) arranged in a specific pattern. This segmentation reduces the resistance of each individual electrode segment while maintaining the overall functionality, effectively managing the trade-off between resistance reduction and structural 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
The solution effectively reduces signal delay and enhances touch performance by lowering the resistance of touch driving electrodes and optimizing the overlapping area between touch driving and sensing electrodes, thereby improving the accuracy and sensitivity of the in-cell touch panel.
Implementation Method 1
metal wires configured to connect the adjacent touch driving sub-electrodes
Implementation Method 2
a sensing capacitor is formed at a position where the two ITO electrodes overlap each other in different planes
Implementation Method 3
when a body part touches the touch panel, an electric field of the body part will act on the sensing capacitor, so as to change a capacitance value of the sensing capacitor
Data Source
AI summary
The present disclosure provides an array substrate and a capacitive in-cell touch panel with the array substrate. The array substrate includes a common electrode layer which is partitioned into a plurality of touch driving electrodes and a plurality of common electrodes arranged alternately. Each touch driving electrode is configured to be applied with a common electrode signal and a touch scanning signal in a time-division manner. Each touch driving electrode includes a plurality of touch driving sub-electrodes spaced apart from each other in an extension direction of the touch driving electrode, and metal wires configured to connect the adjacent touch driving sub-electrodes.