Touch Sensor Mesh Density Variation for Parasitic Capacitance Reduction
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Solution Overview
Problem
The sensitivity of capacitive touch sensors in display devices is deteriorated by parasitic capacitance, which increases as the distance between touch electrodes and the display panel electrodes decreases, affecting the accuracy of touch information detection.
Innovation Solution
A display device with a touch electrode layer featuring a mesh pattern where the density of the mesh is varied, with a higher density at the outer portions and a lower density at the central portion, reducing parasitic capacitance while maintaining mutual capacitance, thereby enhancing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the distance between touch electrode and display panel electrode is decreased, then the device structure is more compact, but parasitic capacitance increases and sensitivity deteriorates
Solution Approach 1:
The touch electrode is designed with non-uniform mesh density: higher density at outer portions and lower density at central portion. This local variation optimizes the balance between maintaining mutual capacitance for touch detection and reducing parasitic capacitance with display panel electrodes, thereby improving touch sensitivity in a compact device structure.
2Ease of manufacture
If uniform mesh density is used in touch electrode, then manufacturing is simpler, but parasitic capacitance cannot be effectively reduced
Solution Approach 1:
The touch electrode employs a mesh pattern with spatially varying density, where the central portion has lower density and outer portions have higher density. This local differentiation reduces parasitic capacitance generated between the touch electrode and display panel electrodes, while remaining compatible with standard manufacturing processes.
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 design effectively reduces parasitic capacitance without compromising mutual capacitance, leading to improved sensitivity performance of the touch sensor.
Implementation Method 1
due to the parasitic capacitance generated between the touch electrode and the electrode of the display panel, sensitivity of the sensor may deteriorate
Data Source
AI summary
A display device includes a substrate and a touch electrode layer disposed on the substrate. The touch electrode layer includes a touch electrode having a mesh pattern. The density of the mesh pattern in a central portion of the touch electrode is different from the density of the mesh pattern at an outer portion of the touch.