Touch Panel Assembly Multi-Touch Coordinate Determination
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Solution Overview
Problem
Resistive type touch panels require a large number of electrodes and wires, increasing the bezel width of display panels and reducing productivity due to the need for multiple cells to detect single touches, which limits their ability to accurately determine multi-touch coordinates.
Innovation Solution
A method and touch panel design that detects touch coordinates by determining the number of touches based on the distance between electrodes, using a first and second substrate with overlapping electrodes to measure electrical signals and calculate expected touch coordinates, allowing for accurate detection of multi-touches with fewer electrodes and wires, thereby reducing the bezel width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of cells are used to increase touch panel resolution, then the resolution is improved, but the number of upper and lower electrodes and wires increases, causing the bezel width to increase
Solution Approach 1:
The patent transitions from detecting touches at discrete cell intersections to continuously measuring touch positions within cells using voltage division principles. By applying voltages to electrode terminals and measuring voltages at touch positions, the system achieves sub-cell resolution without increasing the number of electrodes or wires, effectively adding a dimensional aspect to touch detection precision.
Solution Approach 2:
The patent changes the detection parameter from discrete cell identification to continuous voltage measurement. By measuring voltage values at touch positions and calculating touch coordinates based on voltage ratios, the system achieves high-resolution touch detection without increasing electrode density, thereby reducing bezel width while maintaining measurement precision.
2Measurement precision
If the number of upper and lower electrodes and wires is increased to increase touch panel resolution, then the resolution is improved, but the bezel width increases, decreasing productivity
Solution Approach 1:
The patent introduces voltage measurement as an additional detection dimension within each cell, allowing high-resolution touch detection without increasing the physical number of electrodes. This enables more panels to be cut from each mother glass while maintaining touch detection quality, thereby improving productivity.
Solution Approach 2:
The patent makes each electrode serve multiple functions: defining cell boundaries, providing voltage references for division, and enabling continuous position measurement within cells. This multi-functionality eliminates the need for additional electrodes to achieve high resolution, reducing bezel width and increasing the number of panels producible from each mother glass.
3Device complexity
If a resistive type touch panel uses a single cell to detect touches, then the number of electrodes is reduced, but the ability to accurately determine multi-touch coordinates is limited
Solution Approach 1:
The patent adds the dimension of voltage measurement within each cell to distinguish multiple touches. By measuring voltages at different positions and calculating coordinates based on voltage ratios, the system can accurately determine multiple touch points even within a single cell, maintaining low electrode complexity while achieving high multi-touch detection accuracy.
Solution Approach 2:
The patent replaces the mechanical approach of using separate physical cells for each touch detection zone with an electrical field-based measurement system. By using voltage division and measurement, the system can distinguish multiple touches within the same physical space without requiring separate mechanical or structural divisions, thereby maintaining simplicity while enabling accurate multi-touch detection.
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
Enables accurate determination of multi-touch coordinates with a reduced number of electrodes and wires, decreasing the bezel width and increasing productivity by recognizing multiple touches in a single cell, enhancing the efficiency of touch panel technology.
Implementation Method 1
detecting a touch position in the detected touch cell based on a first electrical signal measured at least one of a plurality of terminals of the first and second touch electrodes
Data Source
AI summary
A method of determining a touch coordinate in a touch panel includes detecting a touch cell among a plurality of touch cells, wherein the plurality of touch cells are defined by a plurality of areas in the touch panel in which a first touch electrode and a second touch electrode overlap with each other, detecting a touch position in the detected touch cell based on a first electrical signal measured at least one of a plurality of terminals of the first and second touch electrodes, determining a number of touches based on a distance between a first touch and a second touch, determining expected touch coordinates corresponding to the number of touches, and determining the touch coordinate based on a second electrical signal measured at least one of the plurality of terminals of the first and second touch electrodes and the expected touch coordinates.