Projection Image Color Shading Control During Range Shifting
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Solution Overview
Problem
Existing projection technologies struggle to effectively correct color shading and brightness unevenness in projected images, particularly when shifting the projection range, leading to reduced image quality.
Innovation Solution
A control device and method that combines output adjustment of the light source and image data adjustment in a projection apparatus to correct color shading and brightness unevenness by using a control device that includes a processor to manage the projection apparatus, adjusting the light source output and image data input to the light modulation element to maintain image quality during shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If projection range is shifted, then projection flexibility is improved, but color shading and brightness unevenness worsen
Solution Approach 1:
The patent applies parameter changes by adjusting the driving levels of liquid crystal pixels based on their positional information relative to the optical axis. Different pixels receive different driving level parameters to compensate for the inherent brightness and color unevenness that occurs during projection range shifting, thereby maintaining uniformity across the projection surface.
Solution Approach 2:
The patent implements local quality by applying position-specific correction to individual pixels or pixel groups. Each pixel's driving level is independently adjusted according to its distance from the optical axis and its location within the projection range, allowing localized compensation for shading and color unevenness rather than uniform correction across the entire image.
2Manufacturing precision
If liquid crystal panel driving level is adjusted per position, then color uniformity is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the relationship between pixel positions and optimal driving levels in a lookup table or correction data structure. During operation, the system simply retrieves pre-computed correction values based on pixel coordinates rather than performing complex real-time calculations, thereby reducing computational complexity while maintaining color uniformity.
3Manufacturing precision
If light source output is adjusted, then brightness uniformity is improved, but energy efficiency worsens
Solution Approach 1:
The patent applies local quality by selectively adjusting the driving levels of specific pixel regions rather than uniformly reducing light source output. Only pixels in regions experiencing excessive brightness or color unevenness receive modified driving levels, allowing the light source to maintain high overall output while achieving local brightness uniformity and minimizing energy waste.
Data Source
AI summary
A control device of a projection apparatus that projects an image optically modulated by a light modulation element, includes: a processor, and the processor is configured to perform a control of correcting color shading of a projection image that is projected, based on combined use of output adjustment of a light source used in the projection by the projection apparatus and adjustment of image data input into the light modulation element.