Optical Touch Control Device Using Single Detector and Pulse Analysis
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Solution Overview
Problem
Conventional optical touch control devices require multiple optical detectors to estimate touch coordinates, increasing production costs and calculation complexity.
Innovation Solution
An optical touch control device utilizing a single optical sense module to emit light signals and obtain image data, with a calculation module determining touch coordinates based on pulse parameters, including position and intensity, to simplify the system and reduce detector count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple optical detectors are used to estimate touch coordinates via triangulation, then measurement precision is improved, but device complexity and production cost increase
Solution Approach 1:
The patent segments the touch detection function into two parts: a single optical detector captures the entire light pattern from multiple light sources, while computational algorithms segment and analyze different light source contributions to determine touch coordinates. This replaces the physical segmentation of multiple detectors with functional segmentation through signal processing.
Solution Approach 2:
The patent replaces the mechanical/optical system of multiple physical detectors with a computational system. Instead of using multiple detectors to physically capture light from different angles, the system uses a single detector combined with algorithms that process the light intensity patterns to calculate touch coordinates, substituting physical complexity with computational processing.
2Measurement precision
If multiple optical detectors are used to obtain image data, then measurement precision is improved, but calculation complexity increases due to synchronization and data comparison requirements
Solution Approach 1:
The patent extracts the coordinate estimation function from the hardware configuration and places it entirely in the computational domain. By taking out the need for multiple detectors and their synchronization requirements, the system uses a single detector where the computational algorithms extract all necessary information from the light intensity distribution, eliminating synchronization complexity.
Solution Approach 2:
The patent substitutes the complex synchronization and data comparison mechanisms required by multiple detectors with a simplified single-detector system. The computational algorithms process the light intensity pattern directly without needing to synchronize multiple data streams or perform complex inter-detector comparisons, reducing calculation complexity while maintaining precision.
3Measurement precision
If multiple optical detectors are installed, then production cost increases, but touch coordinate detection capability is maintained
Solution Approach 1:
The patent makes the single optical detector perform multiple functions that previously required multiple specialized detectors. The single detector captures light patterns from multiple light sources simultaneously, and through computational processing, it performs touch coordinate detection, touch pressure estimation, and touch object identification, replacing multiple detectors with one multi-functional sensor.
Solution Approach 2:
The patent replaces the expensive multi-detector hardware system with a cheaper single-detector system enhanced by computational algorithms. This substitution reduces component costs, simplifies assembly, and lowers production expenses while maintaining or improving detection capabilities through software-based processing of the light intensity data.
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
This solution reduces production costs and calculation complexity while maintaining accurate touch coordinate determination, enhancing the efficiency of the optical touch control device.
Implementation Method 1
an optical module, including a light source and a sense module for emitting a light signal to a touch object
Implementation Method 2
obtaining an image data of the touch object via the sense module
Data Source
AI summary
An optical touch control device includes a touch zone, an optical module, including a light source and a sense module for emitting a light signal to a touch object within the touch zone and obtaining an image data of the touch object via the sense module, and a calculation module coupled to the optical module for determining a touch coordinate of the touch object relative to the touch zone according to a pulse of the image data, wherein the pulse comprises a position parameter and a value parameter.