Sub-pixel Shift Correction for High-Resolution Display Quality
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Solution Overview
Problem
High-performance image display apparatuses, such as projectors, face challenges in maintaining image quality due to shifts in the display positions of sub-pixels, which become more pronounced with increased pixel density, leading to deterioration in image quality.
Innovation Solution
An image display apparatus and method that includes a shift-amount storing unit to store positional shifts of sub-pixels, an image-signal correcting unit to correct input signals based on these shifts, and an image display unit to display images using the corrected signals, allowing for accurate alignment and reduction in storage capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels of the matrix liquid crystal display device is increased to improve image quality, then the image quality of the display image is improved, but the shifts of display positions of sub-pixels become conspicuous and cause deterioration in image quality
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction data for sub-pixel position shifts in a correction data storage unit. Before actual image display, the system stores the relationship between sub-pixel positions and correction values, obtained through preliminary measurement of the optical system's chromatic aberration characteristics. This allows the image signal processing unit to quickly apply corrections without real-time calculation, resolving the contradiction by preparing correction data in advance.
Solution Approach 2:
The patent employs parameter changes by adjusting image signals based on stored correction data that compensates for sub-pixel position shifts. The system changes the parameters of image signals (brightness, color components) according to the correction values, effectively counteracting the position shifts caused by optical aberrations. This allows high-resolution display while maintaining accurate sub-pixel alignment through parameter adjustment rather than physical repositioning.
2Measurement precision
If the number of pixels is increased, then image quality is improved, but positional adjustment for each pixel by the optical system becomes more difficult
Solution Approach 1:
The patent replaces mechanical adjustment of the optical system with electronic signal processing. Instead of physically adjusting the positions of optical components to align sub-pixels, the system uses the image signal processing unit to electronically correct image signals based on stored correction data. This substitution of mechanical adjustment with electronic processing resolves the contradiction by maintaining high pixel density without increasing optical system complexity.
Solution Approach 2:
The patent creates a digital copy of the optical system's aberration characteristics through correction data. By measuring and storing the relationship between sub-pixel positions and their actual display positions, the system creates a correction map that replicates the optical behavior. This digital copy allows the processing unit to compensate for optical imperfections without physically modifying the optical system, reducing adjustment complexity while maintaining image quality.
Data Source
AI summary
An image display apparatus that displays an image on the basis of input image signals corresponding to sub-pixels forming one pixel includes a shift-amount storing unit that stores shift amounts of display positions of the sub-pixels relative to given reference positions in a display image, an image-signal correcting unit that corrects the input image signals according to the shift amounts, and an image display unit that displays an image on the basis of the image signals corrected by the image-signal correcting unit.