Laser Projection Display Pixel Alignment and Distortion Correction
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Solution Overview
Problem
Laser projection displays using optical scanners often experience image distortion due to misalignment and convergence issues of red, green, and blue images, primarily caused by optical and mechanical factors, including structural tolerance and environmental heating.
Innovation Solution
A method for compensating image distortion in laser projection displays involves performing pixel alignment and distortion compensation for each color image using distortion compensation functions, where pixel coordinate values are calculated and mapped to correct misalignment, with an alignment controller selecting images for alignment and a driving unit generating drive signals to align and compensate for distortions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light rays of different colors are projected through different paths, then color image generation is achieved, but image misalignment and distortion occur
Solution Approach 1:
The patent segments the image processing for different colors (R, G, B) by creating separate lookup tables for each color channel. This allows independent distortion compensation for each color image while maintaining the overall color generation capability, resolving the misalignment issue caused by different optical paths
Solution Approach 2:
The patent changes the coordinate parameters by creating lookup tables that map original coordinates to compensated coordinates for each color. This parameter transformation compensates for the distortion introduced by different optical paths without requiring physical realignment of the optical components
2Speed
If optical scanner is used for image display, then dynamic image projection is achieved, but image distortion occurs due to structural tolerance and heating
Solution Approach 1:
The patent performs preliminary distortion compensation by pre-calculating and storing lookup tables that compensate for expected distortion from the optical scanner. This preliminary action corrects the image before it is projected, counteracting the distortion that would otherwise occur due to structural tolerance and heating of the optical scanner
Solution Approach 2:
The patent implements a feedback mechanism where the actual display position and distortion characteristics are measured, and this information is used to generate appropriate lookup tables for compensation. The system continuously adapts to the optical scanner's performance, correcting for heating and structural variations in real-time
3Measurement precision
If pixel alignment is performed for each color image, then alignment accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent creates simplified copies of the alignment and distortion compensation process for each color channel using lookup tables. Instead of implementing complex real-time processing for each color, pre-computed lookup tables provide the same alignment accuracy with much simpler processing, reducing device complexity while maintaining precision
Data Source
AI summary
A laser projection display and a method of compensating for image distortion of the same stereoscopic liquid crystal display device having a touch panel and a method for manufacturing the same are disclosed. Herein, the method includes displaying a picture including a red image, a green image, and a blue image, selecting one of the red image, the green image, and the blue image so as to perform pixel alignment of the picture, calculating pixel coordinate values x+dx and y+dy corresponding to the selected image (herein, x represents the x coordinate value prior to alignment, y represents the y coordinate value prior to alignment, dx represents a varied x coordinate value after alignment, and dy represents a varied y coordinate value after alignment), calculating distortion compensation coordinate values X′ and Y′ corresponding to the pixel coordinate values x+dx and y+dy, and mapping the distortion compensation values X′ and Y′, thereby compensating for an image distortion occurring in the selected image.