Optical Touch Device Multi-Module Ghost Point Filtering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current optical touch sensing devices face challenges in accurately detecting multiple touch points due to 'ghost points' errors and reduced sensing accuracy at the edges or beyond a certain distance, leading to increased complexity and computation requirements.
Innovation Solution
The optical touch device employs multiple sets of optical sensing modules with a processing unit that excludes coordinates data from areas with lower reliability, simplifying the determination of touch points by filtering out unreliable data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple optical sensing modules are used to detect multiple touch objects, then the ability to detect multi-touch is improved, but the complexity of identifying and calculating touch points increases and ghost points errors occur
Solution Approach 1:
The patent divides the touch detection task into multiple independent optical sensing modules, each responsible for detecting touch objects from its own perspective. Each module independently captures images and generates touch point candidates, which are then integrated by the processing unit. This segmentation allows the system to handle multi-touch scenarios while distributing the computational load across multiple independent detection channels.
2Measurement precision
If additional touch devices are added at different locations to assist determining touch points and filtering ghost points, then the accuracy of touch point determination is improved, but the device complexity and required computation amount increase
Solution Approach 1:
The patent combines multiple optical sensing modules into a single integrated touch detection system. Instead of using separate touch devices at different locations, the invention merges the sensing functions of multiple optical cameras and integrates their data through a unified processing unit. This merging approach maintains the accuracy benefits of multiple detection points while reducing overall device complexity and computational requirements through coordinated data processing.
3Device complexity
If the touch device is limited to two optical sensing modules, then the device complexity is reduced, but the sensing accuracy decreases in areas close to the connection line between the two modules or beyond certain distance ranges
Solution Approach 1:
The patent extends the detection capability from a two-module linear arrangement to a multi-dimensional spatial configuration with multiple optical sensing modules positioned at different locations. This dimensional expansion allows the system to cover a broader touch area with improved accuracy across the entire surface, including regions that would be problematic in a simple two-module setup. The processing unit integrates data from multiple angles and positions to maintain high precision throughout the touch zone.
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 approach enhances the accuracy of touch point determination by reducing the consideration of unreliable data, thereby improving the detection of real touch points and reducing computational complexity.
Implementation Method 1
An application principle of the optical touch technique is to detect a position of a finger by detecting a light shielded or reflected by a touch object
Data Source
AI summary
An optical touch device and a sensing method thereof are provided. The optical touch device includes a plurality of optical sensors and a processing unit. The optical sensors are arranged around a touch plane and are spaced from each other. The two adjacent optical sensors located at one side of the touch plane are defined as one set of an optical sensing module, such that the optical sensors are paired to form multiple sets of the optical sensing modules. The processing unit generates a plurality of touch coordinates data corresponding to the plurality sets of the optical sensing modules according to the optical touch data, and determines whether the touch coordinates data corresponding to each set of the optical sensing modules is in at least one touch-excluded area corresponding to each set of the optical sensing modules, and respectively excludes the touch coordinates data in the touch-excluded area.