Touch Position Detection Using Baseline Subtraction
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Solution Overview
Problem
Touch displays face challenges in accurately determining object positions due to noise interference, which affects signal values and leads to errors in position detection, especially with human body signals that introduce significant noise variations.
Innovation Solution
The method involves acquiring second touch-related sensing information to calculate centroid positions by subtracting a base value from the first touch-related sensing information, thereby reducing noise accumulation and determining positions directly from differential sensing information, improving the signal-to-noise ratio and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing information is obtained by scanning along horizontal and vertical axes of the touch panel, then position detection is enabled, but noise interference affects signal values and causes errors in position detection
Solution Approach 1:
The patent applies preliminary action by establishing a baseline of sensing information before the external object touches or approaches the touch panel. This baseline is stored and subsequently used for comparison to eliminate noise interference. The baseline represents the initial state of the touch panel without external influence, allowing the system to distinguish between normal variations and actual touch signals.
Solution Approach 2:
The patent implements feedback by continuously comparing current sensing information with the stored baseline and using this comparison to determine position. The system feeds back the difference between current and baseline values to identify touch events, thereby compensating for noise and improving measurement precision.
2Ease of operation
If baseline comparison method is used to determine touch position, then position detection is simplified, but noise variations directly or indirectly affect signal values causing detection errors
Solution Approach 1:
The system performs preliminary action by capturing and storing the baseline sensing information before any touch occurs. This pre-established reference allows for straightforward comparison with subsequent readings while accounting for environmental noise and human body interference, thus maintaining both simplicity and accuracy.
Solution Approach 2:
The comparison between current sensing information and the stored baseline creates a feedback mechanism that automatically compensates for noise. The system uses this feedback to identify genuine touch events versus noise variations, preserving operational simplicity while enhancing measurement precision.
3Productivity
If sensing information is accumulated to convert into signal values, then position calculation is facilitated, but noise values are accumulated too degrading the signal-to-noise ratio
Solution Approach 1:
The patent applies taking out by extracting and storing the baseline sensing information separately before accumulation. By removing the baseline component first, the system prevents noise accumulation during the accumulation process, thereby maintaining a high signal-to-noise ratio while still enabling efficient position calculation through accumulation of the cleaned signal values.
Solution Approach 2:
The system performs preliminary subtraction of the baseline before accumulating sensing information. This preliminary action eliminates noise from the accumulation process, allowing the system to maintain both high productivity through efficient accumulation and high measurement precision by preventing noise degradation of the signal-to-noise ratio.
Data Source
AI summary
The method and device for position detection are disclosed. Corresponding to a first touch related sensing information, a second touch related sensing information is acquired for determining at least one position. Each position is used separately for determining the position of a centroid according to the first touch related sensing information or the second touch related sensing information.