Lozenge Electrode Touch Sensor Panel for Accurate Position Detection
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Solution Overview
Problem
Existing touch sensor panels face challenges in accurately detecting the position of touches, especially with objects like stylus pens, without degrading the performance of the display module, due to non-linear capacitance changes across the touch surface.
Innovation Solution
A touch sensor panel design featuring lozenge-shaped unit electrodes in a column direction with receiving electrodes arranged to cross through the center, forming an orthogonal array across different layers, and an insulation layer in between, which enhances the linearity of capacitance changes for precise touch position detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional electrode patterns are used, then the touch sensor panel can detect touch input, but the capacitance change is non-linear making accurate touch position detection difficult
Solution Approach 1:
The drive electrode is divided into multiple lozenge-shaped unit electrodes arranged in a column. Each unit electrode has a specific geometric shape (lozenge with 60-degree angles) that creates a controlled electric field distribution. This segmentation allows the capacitance change to vary linearly with touch position, improving measurement precision while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent changes the geometric parameters of the unit electrodes to lozenge shapes with specific angles (60 degrees) and arrangements. By optimizing these geometric parameters, the electric field distribution is controlled to produce linear capacitance changes across the touch surface, directly improving touch position detection accuracy without increasing device complexity.
2Device complexity
If the touch sensor panel uses a simple electrode arrangement, then the device complexity is low, but the linearity of capacitance changes is poor reducing detection accuracy
Solution Approach 1:
The unit electrodes use curved lozenge shapes rather than straight-edged geometric forms. The curved boundaries of the lozenge-shaped electrodes create a more uniform electric field distribution across the touch surface, which improves the linearity of capacitance changes. This curved geometry achieves better measurement precision while maintaining visual and structural simplicity.
3Measurement precision
If stylus pen with small contact area is used, then precise input is possible, but accurate detection of touch position becomes more challenging
Solution Approach 1:
The lozenge-shaped unit electrodes create localized electric field regions with specific characteristics. Each unit electrode's geometric shape is optimized to produce a controlled local electric field that responds linearly to small contact areas. This local optimization ensures that even with a stylus pen's small contact area, the capacitance change remains detectable and linearly related to position, improving measurement precision without being adversely affected by the small contact area.
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 improves the accuracy of touch position detection by ensuring linear capacitance changes, simplifying the detection process and maintaining the display module's performance, as demonstrated by simulations showing improved linearity and interpolability compared to conventional patterns.
Implementation Method 1
the touch sensor panel senses a touch on the touch sensor panel and a position of the touch through a capacitance change or a capacitance change amount
Data Source
AI summary
A touch sensor panel may be provided that includes a plurality of drive electrodes formed in a first layer; and a plurality of receiving electrodes which are arranged to cross the plurality of drive electrodes and are formed in a second layer. In the plurality of drive electrodes, a column of drive electrodes is formed by connecting a plurality of lozenge-shaped unit electrodes in a column direction, and the drive electrodes of each column are disposed at a regular interval in a row direction. The plurality of receiving electrodes are composed of a line having a predetermined width and are arranged in the row direction in such a way as to pass through a center of the unit electrode. Through this, the touch sensor panel capable of linearly detecting the change of the capacitance is provided, so that touch position can be accurately detected.