Optical Touch Sensing via Pixel Zone Angle Interpolation
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Solution Overview
Problem
Large-sized optical touch screens face challenges in maintaining the optical sensing module and reflector on the same plane, leading to deformation of the touch plane, which affects reflective efficiency and makes it difficult to determine the touch point accurately, requiring time-consuming analysis of each sensing pixel for incident angles.
Innovation Solution
The method selects a plurality of sensing pixel zones on the optical sensing module, chooses a main incident angle based on light intensity distribution, and calculates corresponding angles for unselected zones using linear interpolation, allowing for faster determination of touch points without analyzing all pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an optical sensing module with image sensing array is provided for receiving light within an incident angle range, then the ability to handle touch plane deformation is improved, but the time required for analyzing each sensing pixel to determine touch point increases
Solution Approach 1:
The image sensing array is divided into multiple sensing pixel zones, each associated with a specific incident angle range. This segmentation allows the system to process different regions of the sensor array independently, enabling parallel analysis of multiple zones simultaneously rather than sequentially processing each pixel individually, thus reducing overall processing time while maintaining the ability to handle touch plane deformation across the entire sensing area
Solution Approach 2:
The system pre-establishes the correspondence between sensing pixel zones and incident angle ranges before touch detection occurs. By pre-configuring which pixel zones correspond to which incident angle ranges, the system eliminates the need for real-time calculation of incident angles for each pixel during touch detection, significantly reducing processing time while maintaining accurate touch point determination
2Reliability
If the optical sensing module and reflector are disposed on the same plane, then the reflective efficiency is improved, but this becomes difficult to maintain in large-sized touch screens
Solution Approach 1:
The system dynamically adjusts the incident angle ranges associated with different sensing pixel zones based on the actual geometric relationship between the optical sensing module and reflector. This dynamic adaptation allows the system to compensate for deviations from the ideal same-plane configuration, maintaining reliable touch detection and reflective efficiency even when the sensing module and reflector cannot be perfectly aligned on the same plane in large-sized screens
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 enables faster and more accurate determination of touch points by obtaining main incident angles for each sensing pixel, improving the touch sensing rate and reducing operation time.
Implementation Method 1
The sensing beam travels through a touch sensing area and is reflected back to the optical sensing module by a reflector
Implementation Method 2
an optical sensing module having an image sensing array is provided for receiving light that enters the optical sensing module within an incident angle range
Data Source
AI summary
A sensing method of optical touch, adapted for providing and sensing a sensing beam through at least one optical sensing module, is provided. The sensing method of optical touch includes the following steps. A plurality of sensing pixel zones of the optical sensing module is selected, and a main incident angle is chosen in an incident angle range according to light intensity sensed by each of the selected sensing pixel zones, wherein the sensing beam entering the optical sensing module at the main incident angle has a maximum light intensity. Main incident angles corresponding to the unselected sensing pixel zones are computed according to the main incident angles corresponding to the selected sensing pixel zones.