Infrared Touch Position Scanning for Fast, Accurate Detection
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Solution Overview
Problem
Infrared touch control systems suffer from low scanning frame rates and significant positional deviations when scanning in multiple directions due to the sequential scanning of infrared transmitting and receiving tubes, leading to inaccuracies during fast touch operations.
Innovation Solution
Selecting a subset of infrared transmitting tubes for scanning and grouping receiving tubes to receive signals in sequence, reducing scanning time and improving frame rates by synchronizing data collection across both axes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all infrared transmitting tubes are scanned sequentially to ensure complete coverage, then measurement precision is improved, but productivity deteriorates due to low scanning frame rate
Solution Approach 1:
The patent divides the scanning task into segments by selecting only certain transmitting tubes (e.g., every other tube) as scanning transmitting tubes in each frame. This segmentation allows the system to scan a subset of tubes simultaneously, improving frame rate while still achieving complete coverage over multiple frames, thus resolving the contradiction between complete scanning coverage and high scanning speed.
2Device complexity
If sequential scanning along one direction is completed before scanning the other direction to simplify control, then device complexity is reduced, but loss of time increases due to slow response to fast moving touch points
Solution Approach 1:
The patent implements dynamic scanning where the selection of scanning transmitting tubes changes from frame to frame. In even frames, certain transmitting tubes are selected; in odd frames, different transmitting tubes are selected. This dynamic approach allows the system to scan both X and Y directions more quickly by overlapping scanning operations, reducing the time loss for fast touch operations while maintaining manageable control complexity through a systematic selection pattern.
3Productivity
If all transmitting tubes are activated simultaneously to improve scanning speed, then productivity is improved, but device complexity increases due to synchronized control requirements
Solution Approach 1:
Instead of activating all transmitting tubes simultaneously, the patent segments them into different groups that are activated in different frames. This segmentation reduces the control complexity compared to simultaneous activation of all tubes, while still improving productivity over sequential scanning by having multiple tubes active in parallel during each frame, thus resolving the contradiction between scanning speed and control complexity.
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
Enhances scanning frame rates and reduces positional deviations, ensuring accurate touch point determination even during fast operations by synchronizing data collection across both axes.
Implementation Method 1
sensing elements for transmitting and receiving an infrared ray are installed on the outer frame of a touch screen
Data Source
AI summary
Embodiments of the present application provide a method and an apparatus for determining a position of a touch point. The method includes: determining, according to a scanning frame, a plurality of scanning infrared transmitting tubes; controlling a target scanning infrared transmitting tube to transmit an infrared signal, and controlling multiple groups of corresponding infrared receiving tubes to receive the infrared signal in sequence so as to obtain scanning data corresponding to the target scanning infrared transmitting tube; updating the target scanning infrared transmitting tube to be any one of scanning infrared transmitting tubes that have not been used for scanning, to repeatedly perform the step of controlling the target scanning infrared transmitting tube to transmit an infrared signal until obtaining scanning data corresponding to all scanning infrared transmitting tubes; and determining, according to the scanning data corresponding to all scanning infrared transmitting tubes, the position of the touch point.