Light-Sensing Oxide Semiconductor Transistor Circuit for Optical Touch Panels
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Solution Overview
Problem
Current touch panels and image acquisition apparatuses face challenges in scaling due to complex circuit structures and sensitivity issues, limiting their effectiveness in larger sizes and requiring smaller light-sensitive devices for optical touch panels and image acquisition.
Innovation Solution
A light-sensitive oxide semiconductor transistor is used as both a light sensing device and a driving circuit, with a simple circuit configuration including a row selection line, driving voltage line, and data line, utilizing threshold voltage signals to sense light and output data, and integrated into a remote optical touch panel and image acquisition apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional photodiodes with PN junction structure are used for light sensing, then light sensing function is achieved, but device complexity and circuit structure become complex
Solution Approach 1:
The patent merges the light sensing function and driving circuit functions into a single oxide semiconductor transistor. The transistor simultaneously acts as the light sensing device and the driving circuit, eliminating the need for separate photodiode structures and reducing overall device complexity while maintaining reliable light sensing functionality.
Solution Approach 2:
The oxide semiconductor transistor is designed to perform multiple functions: it serves as both the light sensing element and the driving circuit. This multi-functional design simplifies the overall device structure by eliminating separate components that would otherwise be required for light sensing and circuit control.
2Area of stationary object
If touch panel size is increased to large-sized screens, then display size is improved, but line resistance and parasitic resistance increase causing inefficient operation
Solution Approach 1:
The patent replaces the mechanical/electrical contact-based resistive touch panel system with an optical sensing system using oxide semiconductor transistors. This substitution eliminates the line resistance and parasitic resistance issues inherent in large-sized resistive touch panels, enabling efficient operation across large display areas.
3Area of stationary object
If optical touch panel size is increased, then display size is improved, but light sensing device size must be reduced maintaining sensitivity
Solution Approach 1:
The patent utilizes changes in the threshold voltage parameter of the oxide semiconductor transistor in response to light incidence. This parameter change allows the transistor to maintain high light sensing sensitivity while being miniaturized, enabling large-sized optical touch panels with reduced individual sensing element dimensions.
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
The solution enhances photosensitivity, allowing for a simplified pixel structure and efficient light sensing, enabling larger-sized optical touch panels and image acquisition systems with improved performance and reduced noise.
Implementation Method 1
a light-sensitive oxide semiconductor transistor including a channel layer of a light-sensitive oxide semiconductor, wherein the light-sensitive oxide semiconductor transistor is configured as a light sensing device that senses light
Data Source
AI summary
Example embodiments are directed to light sensing circuits having a relatively simpler structure by using light-sensitive oxide semiconductor transistors as light sensing devices, and remote optical touch panels and image acquisition apparatuses, each including the light sensing circuits. The light sensing circuit includes a light-sensitive oxide semiconductor transistor in each pixel, wherein the light-sensitive oxide semiconductor transistor is configured as a light sensing device, and a driving circuit that outputs data. The light sensing circuit may have a relatively simple circuit structure including a plurality of transistors in one pixel. As a result, the structure and operation of the light sensing circuit may be simplified.