Touch Display Sensing Pads Area Adjustment for Capacitance Uniformity
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Solution Overview
Problem
Conventional touch type display devices face limitations in maintaining consistent intervals between touch electrodes, leading to deviations in capacitance and reduced touch sensitivity due to manufacturing inaccuracies and curvature of the touch sensing electrode plate.
Innovation Solution
A touch type display device with a method that adjusts the area of sensing pads proportionally to the interval between the first touch electrode and the second touch electrode, ensuring uniform capacitance across regions by calculating virtual areas and setting identical intervals, thereby improving touch sensitivity and minimizing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the interval between the first touch electrode and the second touch electrode is maintained constantly, then touch sensitivity is improved, but manufacturing precision deteriorates due to plate curvature and assembly variations
Solution Approach 1:
The patent divides the touch sensing electrode plate into multiple regions and assigns different area values to sensing pads in each region. This local differentiation compensates for interval variations caused by plate curvature and assembly tolerances, maintaining consistent capacitance values across the entire display surface despite manufacturing imperfections.
Solution Approach 2:
The patent changes the area parameter of sensing pads based on their positional location. By calculating and applying position-dependent area adjustments, the system compensates for interval variations without requiring strict mechanical precision in maintaining the electrode spacing.
2Ease of manufacture
If the area of sensing pads is made uniform across all regions, then manufacturing complexity is reduced, but touch sensitivity deteriorates due to capacitance variations in different regions
Solution Approach 1:
Instead of using uniform sensing pads, the patent implements local quality by assigning different area values to sensing pads based on their specific regional characteristics. This ensures that each region achieves optimal capacitance values for consistent touch sensitivity across the entire display, while the area variations are pre-calculated and integrated into the manufacturing process.
3Ease of operation
If the interval between electrodes varies across regions, then ease of assembly is improved, but touch sensitivity uniformity deteriorates due to capacitance deviations
Solution Approach 1:
The patent compensates for interval variations by dynamically adjusting the area parameter of sensing pads. The system calculates position-dependent area values that offset capacitance deviations caused by assembly tolerances, allowing flexible assembly while maintaining uniform touch sensitivity across all regions.
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 enhances touch sensitivity by maintaining uniform capacitance across regions, reducing noise and malfunctions, and providing consistent touch recognition across the display surface.
Implementation Method 1
the capacitive type touch panels are more durable, have a long lifetime, easily support multi-touch, and provide high light transmittance
Implementation Method 2
When the display panel 10 is pressed, a touch sensor immediately measures a change in capacitance caused by a decrease in an interval d2 between the touch driving electrode E1 and the touch sensing electrode E2
Data Source
AI summary
A touch type display device includes a display panel which includes a first touch electrode, and a second touch electrode including a plurality of sensing pads located outside the display panel, wherein an area of each of the plurality of sensing pads is proportional to an interval between the first touch electrode and each of the plurality of sensing pads.