Touch Compensation for Capacitive Screen Jitter
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Capacitive touch screens face inaccuracies in touch recognition due to interference from internal and external signals, leading to abnormal line drawing and jitter, particularly in applications requiring high accuracy like manual drawing or writing.
Innovation Solution
A touch compensation method that estimates coordinates of a point to be compensated based on previous touch recognition points, calculates compensation data, and adjusts second touch data using interference removal coefficients to improve recognition accuracy by reducing interference influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch data is directly used for recognition, then the system responds quickly, but interference from internal and external signals causes inaccuracies in touch recognition
Solution Approach 1:
The patent applies preliminary action by estimating coordinates of touch points at the current moment based on historical touch recognition data from previous moments before actual touch recognition occurs. This predictive approach pre-compensates for potential interference effects, allowing the system to correct touch data proactively rather than reactively, thereby improving accuracy without significantly increasing processing complexity during real-time operation
Solution Approach 2:
The patent implements feedback by continuously monitoring touch recognition results and using the estimated coordinates from multiple previous moments to calculate compensation data. This closed-loop approach feeds back correction information to adjust current touch recognition, systematically reducing interference effects while maintaining a balanced processing complexity through iterative refinement
2Measurement precision
If compensation data is calculated using multiple previous moments, then touch recognition accuracy improves, but processing time increases
Solution Approach 1:
The patent applies partial action by selectively using n previous moments (where n is a positive integer) to estimate current touch coordinates rather than processing all available historical data. This selective approach provides sufficient compensation accuracy for most scenarios while avoiding the excessive processing time that would result from analyzing every possible data point, achieving an optimal balance between precision and efficiency
3Reliability
If interference removal coefficient is applied to second touch data, then the influence of interference is reduced, but the complexity of data processing increases
Solution Approach 1:
The patent applies parameter changes by introducing an interference removal coefficient that modifies the second touch data obtained at the current moment. This coefficient adjusts the touch data parameters to reduce interference effects systematically, improving reliability through a straightforward mathematical transformation rather than complex multi-step processing, thereby enhancing trustworthiness while maintaining manageable system complexity
Data Source
AI summary
A touch compensation method includes: for at least one line, estimating coordinates of a point to be compensated at a current moment according to coordinates of n touch recognition points at n previous moments, and n being an integer greater than or equal to 2; calculating compensation data of a touch model corresponding to the point to be compensated according to first touch data of a touch model corresponding to a touch recognition point of a previous 1st moment T1; obtaining all touch data of a touch screen at the current moment, and obtaining second touch data at the current moment at a place where the touch model corresponding to the point to be compensated is located from the all touch data according to the coordinates of the point to be compensated; and compensating the second touch data according to the compensation data.