Integrated Sensor Circuit Touch Detection Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional touch panel-integrated liquid crystal displays face issues with reduced optical properties and increased thickness, leading to decreased accuracy in touch position detection.
Innovation Solution
A display apparatus with integrated sensor circuits that include multiple sensors capable of detecting different external signals, such as visible and infrared light, connected to a switching device and capacitor configuration, allowing for improved accuracy in touch position detection by simplifying the circuit configuration and increasing sensor resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate touch panel is prepared from the liquid crystal display, then touch input function is achieved, but optical properties (brightness and viewing angle) are deteriorated
Solution Approach 1:
The patent combines the touch sensor circuits with the liquid crystal display panel by integrating sensor circuits into the display panel structure. The sensor circuits share common electrodes and signal lines with the display, merging two functions (display and touch sensing) into a single integrated structure, thereby maintaining optical properties while enabling touch input.
2Adaptability or versatility
If a separate touch panel is prepared from the liquid crystal display, then touch input function is achieved, but entire thickness increases by thickness of touch panel
Solution Approach 1:
The sensor circuits are integrated within the display panel structure, sharing common electrodes and signal lines. This merging eliminates the need for a separate touch panel layer, thereby reducing the overall thickness while maintaining touch input functionality.
3Device complexity
If multiple sensors are commonly connected to an output terminal, then circuit configuration is simplified, but signal detection accuracy may be compromised
Solution Approach 1:
The patent applies preliminary action by charging a capacitor with a specific voltage level before the sensing phase. This pre-charged capacitor provides a reference voltage that enables accurate detection of external signals even when multiple sensors share a common output terminal. The capacitor's stored charge compensates for signal interference, maintaining detection accuracy while allowing circuit simplification.
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
Enhances the accuracy of touch position detection and simplifies the circuit configuration, reducing the number of switching devices while increasing the number of sensors, thereby improving the resolution of the touch panel.
Implementation Method 1
a capacitor disposed between the scan line and the output terminal, charged with a first voltage in response to the scan signal, and charged with a second voltage greater than the first voltage in response to the current signal after the scan line is floated
Implementation Method 2
The sensors sense the at least two external signals and outputs a current signal corresponding to the external signals
Data Source
AI summary
A display apparatus includes a display panel, sensor circuits, and a detection circuit. Each sensor circuit senses at least two external signals different from each other and outputs a sensing signal. The detection circuit receives the sensing signal to detect a position to which the external signals are applied. Each sensor circuit includes sensors commonly connected to an output terminal, a scan line which receives a scan signal, a capacitor disposed between the scan line and the output terminal, charged with a first voltage in response to the scan signal, and charged with a second voltage greater than the first voltage in response to the current signal after the scan line is floated, a switching device which outputs the sensing signal in response to the second voltage, and a readout line which applies the sensing signal output from the switching device to the detection circuit.