Capacitance Adjusting Wiring for Display Touch Detection
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Solution Overview
Problem
Capacitive touch detection devices face challenges in maintaining uniform detection sensitivity due to variations in capacitance of outgoing lines caused by signal lines and other wirings, leading to degraded accuracy and increased frame size in display devices.
Innovation Solution
The implementation of redundancy patterns on the same layer as touch detection lines, which adjust parasitic capacitance and act as shields, equalizing load and reducing noise interference, thereby maintaining accuracy without expanding the frame region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If outgoing lines are extended to connect touch detection electrodes to detection circuits, then touch detection function is enabled, but capacitance varies due to signal lines and other wirings, degrading uniformity of detection sensitivity
Solution Approach 1:
A capacitance adjusting wiring portion is introduced as an intermediary element between the first electrode and the detection circuit. This intermediate component specifically compensates for capacitance variations caused by signal lines and other wirings, thereby maintaining uniform detection sensitivity across the touch detection surface without requiring additional wire layers or process changes.
Solution Approach 2:
The capacitance of the outgoing line is adjusted by modifying the physical parameters of the capacitance adjusting wiring portion, such as its length, width, or position. By changing these geometric parameters, the total capacitance of the outgoing line can be optimized to compensate for variations introduced by signal lines and other wirings, thereby achieving uniform detection sensitivity.
2Area of stationary object
If frame region is reduced for narrower design, then device size is reduced, but maintaining touch detection accuracy becomes more difficult due to limited space for wiring
Solution Approach 1:
The capacitance adjusting wiring portion is arranged in a planar configuration on the same layer as the touch detection electrode, utilizing the two-dimensional space efficiently. This dimensional approach allows capacitance adjustment without requiring additional vertical layers, thereby maintaining a compact design with reduced frame region while preserving touch detection accuracy.
3Measurement precision
If additional wire layers are added to adjust capacitance, then uniformity of detection sensitivity is improved, but device complexity and manufacturing process become more complex
Solution Approach 1:
The capacitance adjusting wiring portion serves multiple functions: it acts as both a capacitance compensation element and a signal transmission path. By integrating these functions into a single component on the same layer, the invention avoids the need for separate additional wire layers, thereby maintaining manufacturing simplicity while achieving uniform detection sensitivity.
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 solution enhances touch detection accuracy and uniformity by homogenizing capacitance and reducing noise interference, allowing for a narrower frame design while maintaining sensitivity, without the need for additional wire layers or process changes.
Implementation Method 1
a first capacitance adjusting wiring portion connected to the first wiring portion on the same layer and serving to adjust the total capacitance of the first electrode and the outgoing line
Data Source
AI summary
A display device includes an array substrate and a counter substrate. The array substrate includes an outgoing line for connecting a first electrode for capacitive touch detection to a detection circuit. The outgoing line includes: a first wiring portion extended from the first electrode side to the detection circuit side; and a first capacitance adjusting wiring portion connected to the first wiring portion on the same layer and serving to adjust the total capacitance of the first electrode and the outgoing line.