Handwriting System Dual Light Source Hover Touch Detection
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Solution Overview
Problem
Conventional handwriting systems using a single light spot fail to distinguish between 'touch' and 'hover' operations, leading to inaccurate control information generation.
Innovation Solution
A handwriting system employing two light source modules and an image sensing device to capture images of an object illuminated by either one or both lights, determining the state (hover or touch) based on the number of light spots, with the processing circuit generating corresponding control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single light spot is used to calculate object position, then the system structure is simple, but the system cannot distinguish between 'touch' and 'hover' operations
Solution Approach 1:
The patent divides the illumination into multiple independent light sources (first light source module and second light source module) that can operate independently. By segmenting the illumination system, the patent enables different lighting patterns (one light spot for hover, two light spots for touch) to represent different operations, thus resolving the contradiction between simple structure and operation distinction accuracy.
Solution Approach 2:
The patent transitions from a single-dimensional illumination approach to a multi-dimensional illumination approach by introducing multiple light sources at different positions. This dimensional expansion allows the system to encode additional information (operation type) into the light spot pattern, enabling distinction between hover and touch while maintaining reasonable system complexity.
2Measurement precision
If multiple light source modules are used to illuminate the object, then the system can distinguish between 'touch' and 'hover' states, but the device complexity increases
Solution Approach 1:
The patent designs the multiple light source modules to serve multiple functions: they not only provide illumination but also encode operation information through their activation patterns. The same illumination system that distinguishes operations also maintains the ability to calculate object position, achieving multi-functionality that justifies the increased device complexity.
Solution Approach 2:
The patent uses the image sensing device to capture and copy the light spot patterns generated by the light source modules. By copying the illumination pattern into the captured image data, the system preserves the operation distinction information while separating the physical illumination complexity from the processing logic.
3Measurement precision
If the system captures images with multiple light spots, then operation distinction is improved, but the image processing complexity increases
Solution Approach 1:
The patent performs preliminary action by pre-establishing the correspondence between light spot patterns (one spot, two spots) and operation types (hover, touch) in the processing circuit. This preliminary mapping allows the system to quickly determine operation type from captured images without complex real-time analysis, reducing image processing complexity while maintaining high state determination accuracy.
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
Effectively differentiates between hover and touch states, allowing for accurate control information generation and object position calculation, enhancing the system's operational precision.
Implementation Method 1
The first light source module is configured to provide a first light to illuminate an object on a plane. The second light source module is configured to provide a second light to illuminate the object on the plane
Implementation Method 2
The image sensing device is disposed above the plane and configured to capture an image of the object reflecting the first light only or an image of the object reflecting the first and the second lights both
Data Source
AI summary
A handwriting system includes a first light source module, a second light source module, an image sensing device and a processing circuit. The first light source module is configured to provide a first light to illuminate an object on a plane. The second light source module is configured to provide a second light to illuminate the object on the plane, wherein the second light source module is disposed under the first light source module. The image sensing device is disposed above the plane and configured to capture an image of the object reflecting the first light only or an image of the object reflecting the first and the second lights both. The processing circuit is electrically connected to the image sensing device and configured to receive the image captured by the image sensing device and generate control information according to light-spot information in the captured image.