Touch Panel Light-Sensitive Pressure-Sensitive Pixels Dark Environment Detection
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Solution Overview
Problem
Conventional touch panels are unable to determine if a pixel is touched in the absence of ambient light, limiting their application.
Innovation Solution
Incorporating a variable capacitor coupled with a switch and a light sensing component, where the capacitance change upon touch allows for voltage level detection, and an integrator circuit to differentiate between touched and untouched states, enabling touch detection regardless of ambient light conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only light sensing component is used in conventional touch panel, then the structure is simple, but the touch detection fails in dark environments without ambient light
Solution Approach 1:
The patent combines light sensing component and pressure sensing component into a single pixel structure. The light sensing component (photo transistor or photo diode) detects ambient light conditions, while the pressure sensing component (capacitive sensor) detects touch events. This merging allows the touch panel to function reliably in both light and dark environments by using the appropriate sensing mechanism for each condition.
Solution Approach 2:
The pixel structure is designed to perform multiple functions: light sensing, pressure sensing, and touch detection. The dual-component pixel can operate in light sensing mode when ambient light is available and switch to pressure sensing mode in dark environments, providing universal touch detection capability across different environmental conditions.
2Reliability
If dual sensing components (light and pressure) are integrated in each pixel, then the touch detection works in both light and dark environments, but the device complexity increases
Solution Approach 1:
The light sensing component and pressure sensing component are merged at the pixel level, sharing common structures such as the transparent electrode and substrate. This integration reduces the overall device complexity compared to having separate sensing systems, while still providing dual-functionality for reliable touch detection in all lighting conditions.
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 efficient determination of touch events in both light and dark environments, enhancing the utility and convenience of the touch panel.
Implementation Method 1
a light sensing component for sensing light then generating a first sensing signal
Implementation Method 2
a pressure sensing component for sensing pressure then generating a second sensing signal
Data Source
AI summary
A touch panel includes a plurality of pixels. Each pixel includes a light sensing component, a pressure sensing component, and a switch. The light sensing component generates a first sensing signal when sensing light. The pressure sensing component generates a second sensing signal when sensing pressure. The switch transmits the first and the second sensing signals when receiving a gate driving signal.