Touch Panel Simultaneous Coordinate Detection Circuit
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Solution Overview
Problem
Conventional touch panel systems require multiple panel drive circuit switches and separate time periods to detect X-coordinates and Y-coordinates of two touched points, making it impossible to measure both coordinates simultaneously.
Innovation Solution
A touch panel device with a configuration of resistance films and electrodes that allows for simultaneous detection of X-coordinates and Y-coordinates by applying voltages and using detectors to calculate coordinates based on detected voltages, eliminating the need for separate circuits for intermediate points and positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate time periods and multiple panel drive circuit switches are used to detect X-coordinates and Y-coordinates, then the detection process can be completed, but the measurement time increases and the device complexity increases
Solution Approach 1:
The patent combines the detection of X-coordinates and Y-coordinates into a single simultaneous measurement process. By configuring electrodes to apply voltages in both X and Y directions and using detectors to measure voltages at contact points, the system obtains both coordinate values at the same time rather than sequentially, thereby reducing measurement time while maintaining detection accuracy.
Solution Approach 2:
The panel drive circuit is designed to perform multiple functions simultaneously: it can detect both X-coordinates and Y-coordinates using the same circuit without requiring separate dedicated circuits for each coordinate direction. This multi-functionality eliminates the need for multiple switches and separate time periods, reducing both device complexity and measurement time.
2Measurement precision
If multiple panel drive circuit switches are used to detect coordinates sequentially, then coordinate detection can be performed, but the device complexity increases
Solution Approach 1:
The patent merges the functionality of multiple coordinate detection circuits into a single integrated system. By using the same panel drive circuit to detect both X and Y coordinates simultaneously through properly configured voltage application and detection, the system eliminates the need for multiple separate circuits and switches, thereby reducing device complexity while maintaining full detection capability.
Solution Approach 2:
The panel drive circuit is designed as a universal circuit that can detect both X-coordinates and Y-coordinates without requiring dedicated separate circuits for each function. This multi-functional design reduces the number of components needed and simplifies the overall device architecture while preserving accurate coordinate detection capabilities.
3Measurement precision
If separate time periods are used to detect intermediate points and positions, then accurate measurement can be achieved, but the measurement time increases
Solution Approach 1:
The patent combines the detection of intermediate points and their positions into a single simultaneous measurement process. By applying voltages through configured electrodes and measuring the resulting voltages at contact points with detectors, the system determines both the intermediate point location and position coordinates at the same time, eliminating the need for separate measurement time periods while maintaining accurate measurement.
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 the measurement of X-coordinates and Y-coordinates of two touched points at the same time, reducing the overall measurement time and simplifying the panel driving circuit, while eliminating the need for additional circuits to detect intermediate points and positions.
Implementation Method 1
a first resistance film; a second resistance film opposed to the first resistance film; a pair of first electrodes that is arranged on the first resistance film, and applies a first voltage to the first resistance film
Data Source
AI summary
A touch panel device including: a first resistance film; a second resistance film opposed to the first resistance film; a pair of first electrodes that is arranged on the first resistance film, and applies a first voltage to the first resistance film; a pair of second electrodes that is arranged on both ends of the second resistance film in the same direction as an application direction of the first voltage; a first detector that is connected to the pair of the second electrodes, and detects voltages at the second electrodes, respectively; and a calculator that calculates coordinates of two points in the application direction of the first voltage based on the respective voltages detected by the first detector.