Color Convergence Correction in Projection Systems
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Solution Overview
Problem
Display technologies based on RGB three-color light sources face color convergence errors due to mechanical errors and chromatic aberration, affecting image clarity.
Innovation Solution
A method and apparatus for correcting color convergence errors by projecting a test pattern with RGB three-color light sources in a dark room, adjusting assembly parameters based on the positions of projection light points to ensure accurate superposition of red, green, and blue pixels, using an image collecting module, adjusting module, and error correcting module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If RGB three-color light source display technology is used to expand color gamut, then color reproduction capability is improved, but color convergence error occurs due to mechanical assembly error and chromatic aberration
Solution Approach 1:
The patent applies preliminary action by performing color convergence detection and correction during the assembly process before the projection system is deployed for actual use. The method detects color convergence errors using a test pattern and camera system, then adjusts the optical components (such as adjusting screws on the optical chip or lens positions) to correct the misalignment of RGB pixels before final assembly completion, thereby preventing color convergence errors from affecting final image quality
Solution Approach 2:
The patent implements feedback by using a camera to capture the positions of projected light points from RGB sources, comparing these positions against reference coordinates, and using this information to guide adjustment of the optical components. The system continuously monitors color convergence through the test pattern projection and camera detection, providing real-time feedback for correction until the RGB pixels are properly aligned
2Productivity
If traditional assembly methods are used without color convergence correction, then assembly process is simple and fast, but image clarity deteriorates due to overlapping error in RGB pixels
Solution Approach 1:
The patent applies self-service by enabling the assembly system to automatically detect and correct its own color convergence errors through the integrated camera and test pattern system. The assembly device performs self-diagnosis by projecting test patterns and capturing images of the projected light points, then automatically calculates correction amounts and adjusts its own optical components without requiring external intervention or complex manual alignment procedures
Data Source
AI summary
Provided are a method and an apparatus for correcting a color convergence error. The method includes: in a dark room environment, collecting a projection light point on a projection screen projected by a projection system, to obtain a projection image; adjusting the test pattern, so that a first projection light point corresponding to the white point of a first coordinate on the test pattern after being projected by a first color light source is located in a center of the projection image; obtaining a second and/or a third projection light points corresponding to the white point of the first coordinate after being projected by a second and/or a third color light sources from the projection image; and adjusting an assembly parameter of the projection system according to a position of the second and/or the third projection light points and a position of the first projection light point.