Touch Screen Display Pixel Shift Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Touch screen display devices face inaccuracies in touch position detection due to pixel degradation and image movement, leading to afterimages and errors in touch perception when pixel shift technology is used to prevent pixel deterioration.
Innovation Solution
The implementation of an image correcting unit and a touch correcting unit that adjust image and touch positions by determining movement amounts and applying mathematical formulas to generate corrected coordinates, ensuring accurate touch detection and image display despite pixel degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pixel shift technology is used to prevent pixel deterioration, then pixel reliability is improved, but touch position detection accuracy deteriorates
Solution Approach 1:
The system uses feedback by detecting the actual touch position and comparing it with the expected position based on image coordinates. The touch correcting unit calculates correction values based on the discrepancy between detected touch positions and image coordinates, then applies these corrections to compensate for pixel shift effects, thereby maintaining touch accuracy while using pixel shift technology
Solution Approach 2:
The system changes parameters by calculating movement amounts between different image coordinates and using these parameter changes to determine correction values. The touch position is adjusted based on the relationship between image coordinate movements and actual touch position movements, allowing the system to adapt to pixel shift variations
2Reliability
If image coordinates are moved to prevent afterimages, then display reliability is improved, but touch perception accuracy deteriorates
Solution Approach 1:
The touch correcting unit acts as an intermediary between the touch sensor and the display system. It receives raw touch position data, calculates corrections based on image coordinate movements, and outputs corrected touch positions. This intermediary function allows the system to maintain both image movement for afterimage prevention and accurate touch perception
Solution Approach 2:
The system performs preliminary action by pre-calculating correction values based on image coordinate movements before touch input is processed. The movement amount between image coordinates is determined in advance, and correction values are prepared accordingly, enabling accurate touch position detection even when images are moved to prevent afterimages
Data Source
Figure 1
Figure 2
Figure 3
AI summary
According to aspects of embodiments of the present invention a touch screen display device includes: a touch sensor; a touch controller configured to detect a position touched on the touch sensor; and a touch correcting unit configured to correct an initial touch position detected by the touch controller to a final touch position, wherein the touch correcting unit comprises: a first computing unit configured to convert the initial touch position to a temporary touch position; a second computing unit configured to compute a touch movement amount between the initial touch position and the temporary touch position; and a third computing unit configured to compute the final touch position by subtracting the touch movement amount from the initial touch position.