Optical Touch Detection Circuit with Improved Signal-to-Noise Ratio
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Solution Overview
Problem
The signal-to-noise ratio of existing optical touch detection circuits is low, making it difficult to accurately determine the position of an optical touch.
Innovation Solution
An optical touch detection circuit comprising a photosensitive module and a detection module, where the photosensitive module generates a photoelectric signal, and the detection module processes this signal to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional optical touch detection circuit is used, then the touch function can be achieved, but the signal-to-noise ratio is low making accurate position determination difficult
Solution Approach 1:
The detection circuit is divided into multiple independent detection units, each responsible for detecting light changes at specific positions. This segmentation allows parallel processing of touch detection across different regions, improving overall signal quality and noise resistance while maintaining precise position determination through coordinated data from multiple units.
Solution Approach 2:
A light guide is introduced as an intermediary component between the light source and the detection units. The light guide efficiently transmits light to the detection positions while isolating the detection circuit from direct exposure to external light sources, thereby reducing noise interference and improving the signal-to-noise ratio for accurate touch position detection.
2Ease of manufacture
If the detection circuit structure is simplified, then manufacturing is easier, but the signal-to-noise ratio decreases
Solution Approach 1:
The detection units are designed with multi-functionality, serving both as light detectors and as noise filtering elements. Each detection unit can independently process signals and the entire array works together to enhance the signal-to-noise ratio, allowing the circuit to maintain simplicity while achieving high reliability through functional integration.
Solution Approach 2:
The circuit utilizes parameter changes in the light guide material and detection unit characteristics to optimize signal transmission. By adjusting optical parameters such as light transmission efficiency and detection sensitivity, the circuit achieves high signal-to-noise ratio without requiring complex structural modifications, maintaining ease of manufacture.
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 proposed circuit enhances the signal-to-noise ratio, enabling precise determination of the optical touch position.
Implementation Method 1
a photosensitive module configured to generate a photoelectric signal
Data Source
AI summary
An optical touch detection circuit and an optical touch display panel are provided. The optical touch detection circuit includes a photosensitive module and a detection module. The photosensitive module is configured to generate a photoelectric signal. The detection module is connected to the photosensitive module. The detection module is configured to implement an optical touch function based on the photoelectric signal. The provided optical touch detection circuit and optical touch display panel can improve a signal-to-noise ratio of the optical touch detection circuit. This is beneficial for accurately determining a position of an optical touch.