Touch Panel Adjusting Electrodes Reduce Capacitive Load
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Solution Overview
Problem
In capacitive touch display panels, the high capacitive load between sensing pads and common electrodes leads to reduced touch sensitivity and accuracy, as excessive capacitance variation detection affects the precise determination of touch points.
Innovation Solution
The introduction of adjusting electrodes, which are not electrically connected to the sensing pads, helps reduce capacitive loads by being connected to a fixed voltage or grounded, thereby enhancing touch sensitivity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the touch devices are disposed on an inner surface of the display panel (in-cell type), then the touch devices coordinate with the display panel most and the panel is thinnest, but the capacitive load between sensing pads and common electrodes becomes greater
Solution Approach 1:
The patent segments the conductive layer into multiple independent components: sensing pads for touch detection, adjusting electrodes for capacitance control, and bridge lines for electrical connection. This segmentation allows the adjusting electrodes to be positioned between the sensing pads and common electrodes to reduce capacitive load while maintaining the in-cell thin structure.
Solution Approach 2:
The adjusting electrodes serve as intermediary elements positioned between the sensing pads and the common electrodes of the display panel. These intermediate electrodes reduce the direct capacitive coupling between sensing pads and common electrodes, thereby lowering the capacitive load while preserving the thin in-cell structure.
2Adaptability or versatility
If the capacitive load between sensing pads and common electrodes exceeds a limit, then the integration is achieved, but the capacitance variation detected by the sensing pads is affected so that touch sensitivity and accuracy deteriorate
Solution Approach 1:
The patent applies local quality by creating regions with different capacitance characteristics. The adjusting electrodes are strategically positioned to create low-capacitance zones between sensing pads and common electrodes, while other regions maintain normal capacitance for display functions. This local modification reduces overall capacitive load without compromising integration.
Solution Approach 2:
The patent changes the capacitance parameter by introducing adjusting electrodes that can be independently controlled. By adjusting the voltage or configuration of these electrodes, the capacitive load between sensing pads and common electrodes can be dynamically optimized to maintain touch sensitivity and accuracy while preserving display integration.
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 capacitive loads between sensing pads and the common electrode are significantly decreased, improving touch sensitivity and accuracy, and reducing the required electricity for touch-driven sensing integrated circuits.
Implementation Method 1
the capacitive load between the sensing pads and the common electrodes is greater... If the capacitive load between the sensing pads and the common electrodes exceeds a limit, the capacitance variation detected by the sensing pads may be affected
Data Source
AI summary
A touch panel includes first sensing pads, first bridge lines, second sensing pads, adjusting electrodes, second bridge lines and third bridge lines. The first sensing pad has a first opening. The first sensing pads and the first bridge lines are arranged alternately along a first direction and electrically connected to each other. The second sensing pads and the second bridge lines are arranged alternately along a second direction and electrically connected to each other. The adjusting electrodes are disposed in the first openings and the second openings, and the adjusting electrodes are electrically disconnected from the first sensing pads and the second sensing pads. Adjacent adjusting electrodes are electrically connected through the third bridge line. The first sensing pads, the second sensing pads and the adjusting electrodes are made of a same patterned conductive layer.