Array Substrate Switch Circuit Reduces Electrode Resistance
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Solution Overview
Problem
Traditional capacitive type in-cell touch panels face issues with high resistance in touch scanning and sensing electrodes, leading to inaccurate positioning of touch points due to the large resistance of ITO-based common electrodes and lines.
Innovation Solution
An array substrate with a switch circuit between the common electrodes and data lines, which connects them in parallel during the touch scanning phase, reducing the equivalent resistance and enhancing the signal-to-noise ratio for more accurate voltage signal monitoring and precise touch point positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ITO material is used for common electrodes and lines in touch scanning phase, then the touch panel achieves capacitive sensing function, but the resistance of touch scanning electrodes and sensing electrodes becomes large
Solution Approach 1:
The patent merges the common electrode function with the touch scanning electrode function by using the same electrode structure for both purposes. During touch scanning phase, the common electrodes serve dual roles as both common electrodes for display and scanning electrodes for touch detection, eliminating the need for separate high-conductivity electrode materials.
Solution Approach 2:
The common electrodes are designed to perform multiple functions: they serve as common electrodes during display phase and as scanning electrodes during touch scanning phase. This multi-functionality allows the ITO material to fulfill both display and touch sensing requirements without needing additional specialized materials.
2Device complexity
If ITO-based common electrodes are used, then the touch panel structure is simplified, but the signal-to-noise ratio decreases due to large resistance
Solution Approach 1:
The patent combines the common electrode and scanning electrode into a single structure, reducing device complexity while maintaining adequate signal quality through optimized electrode geometry and switching circuitry that compensates for the ITO material's inherent resistance.
Solution Approach 2:
The electrode system dynamically switches between display mode and touch scanning mode. During touch scanning, the switching circuitry actively manages the electrode configuration to optimize signal detection, allowing the system to adapt its electrical characteristics based on operational phase.
3Adaptability or versatility
If two layers of strip ITO electrodes are fabricated at the surface of TFT array substrate, then the touch panel achieves in-cell integration, but the thickness of TFT array substrate increases
Solution Approach 1:
The patent merges the touch electrode layers with the display electrode layers, fabricating both functions within the same substrate structure. This integration eliminates the need for additional separate electrode layers, thereby maintaining thin substrate thickness while achieving in-cell touch functionality.
Solution Approach 2:
The same electrode structures serve dual purposes: they function as display electrodes for the liquid crystal modulation and as touch sensing electrodes for capacitance detection. This multi-functionality enables in-cell integration without increasing substrate thickness.
4Adaptability or versatility
If two layers of strip ITO electrodes are fabricated at the surface of TFT array substrate, then the touch function is achieved, but the transmittance of the array substrate decreases
Solution Approach 1:
The patent combines touch electrodes and display electrodes into a single integrated structure, eliminating the need for additional separate electrode layers. This merging approach maintains high substrate transmittance by avoiding extra ITO layers that would otherwise block light.
Solution Approach 2:
The integrated electrodes perform both display and touch functions simultaneously, allowing the substrate to maintain its optical transparency while providing full touch sensing capability through the same electrode structure.
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 the resistance of touch scanning electrodes, improving the signal-to-noise ratio and enabling more accurate monitoring of voltage signals and precise positioning of touch points.
Implementation Method 1
a switch circuit is provided between the first common electrode and the data line, which is turned on at a touch scanning phase so that the first common electrode and the data line is connected with each other in parallel
Implementation Method 2
a sensing capacitance is formed at the intersection of different planes of two strip ITO electrodes. When a human body touches the touch panel, the capacitance value of the sensing capacitance changes, then the voltage signal coupled by the touch sensing lines is changed, and the position of the touch point can be determined according to changes of the voltage signal
Data Source
AI summary
An array substrate, a touch panel and a driving method thereof, and a display device are disclosed. The array substrate comprises a base substrate (1) which is formed with gate lines, data lines (8), first common electrodes (5) and second common electrodes (6) thereon, and the second common electrodes (6) comprise: transverse electrode groups (601) located in the same row and metal jumper wires (302) connecting two adjacent transverse electrode groups (601) in the same row; the first common electrodes (5) comprise longitudinal electrode groups (501), and switch circuits (701, 702) are provided between the first common electrodes (5) and the data lines (8). At the touch scanning phase, the conduction of the switch circuits (701, 702) renders the parallel connection between the first common electrodes (5) and the data lines (8), and then results in the reduction of the equivalent resistance of the first common electrodes (5), and the signal-to-noise ratio of the first common electrodes (5) is indirectly enhanced, thus the present invention achieves more accurate monitoring of voltage signals coupled by touch sensing electrodes and precise positioning of a touch point.