Touch Screen Display Pixel Shift Correction via Lookup Table
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Solution Overview
Problem
Display devices like organic light emitting displays and liquid crystal displays suffer from pixel deterioration leading to afterimages, which is mitigated by pixel shifting, but this requires storing multiple image data sets, increasing manufacturing costs.
Innovation Solution
A touch screen display device with an image corrector that generates second image data based on first image data and a lookup table, correcting touch positions by calculating pixel shift amounts and directions to align moved image data with original positions, reducing pixel deterioration and improving touch operation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pixel shifting technology is used to prevent afterimage, then pixel deterioration is reduced, but manufacturing cost increases due to needing to store multiple image data sets
Solution Approach 1:
The patent extracts only the essential shift information (shift amount and shift direction) from the complete image data, storing this minimal information in a lookup table rather than storing multiple complete image data sets. This reduces memory requirements and manufacturing cost while maintaining the pixel shifting functionality needed to prevent afterimage.
Solution Approach 2:
The patent creates a simplified copy of the image data in the form of a lookup table that contains only the positional shift information. This lookup table serves as a reference that can be used to generate shifted image data without needing to store multiple complete image data sets, thereby reducing manufacturing cost while maintaining reliability.
2Reliability
If image data is moved by pixel shifting, then afterimage is prevented, but touch position accuracy deteriorates because the moved image does not align with the original touch position
Solution Approach 1:
The patent implements a feedback mechanism where the system detects the shift amount and shift direction of the image data, stores this information in a lookup table, and then uses this stored information to correct the touch position. This feedback loop ensures that the touch position accurately reflects the user's intended input despite the image being displayed in a shifted position, thereby maintaining both afterimage prevention and touch accuracy.
Solution Approach 2:
The patent performs preliminary action by pre-calculating and storing the shift information (shift amount and shift direction) in a lookup table before touch input occurs. This allows the system to quickly retrieve the appropriate correction values when a touch event happens, ensuring accurate touch position mapping without introducing processing delays.
3Duration of action of moving object
If multiple image data sets are stored for pixel shifting, then image can be moved to prevent afterimage, but device complexity increases due to additional memory storage requirements
Solution Approach 1:
The patent extracts only the critical shift parameters (shift amount and shift direction) from the complete image data and stores only these extracted parameters in the lookup table. This dramatically reduces the memory storage requirements compared to storing multiple complete image data sets, thereby reducing device complexity while maintaining the ability to move images for afterimage prevention.
Data Source
AI summary
A touch screen display device includes: an image corrector configured to generate second image data based on first image data and to generate a second lookup table based on a positional relationship between a first pixel driven corresponding to predetermined data in the first image data and a second pixel driven corresponding to the predetermined data in the second image data; a data driver configured to generate a data signal based on the second image data; a display panel comprising pixels configured to emit light with a brightness corresponding to the data signal; and a processor configured to correct a second touch position on the second pixel to a first touch position on the first pixel based on the second lookup table.