Color-Based Distortion Correction Circuit for Laser Projectors
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Solution Overview
Problem
Laser projectors face color shifts in displayed images due to positional variations of laser beams by color, leading to complex control circuits required for adjustment.
Innovation Solution
A circuit apparatus with a distortion correction circuit that performs color-based distortion correction using warp parameters specific to each color, simplifying the control circuit by correcting shifts in display positions across colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an adjuster is added to adjust laser beam drive timings to correct color shifts, then color shift correction is achieved, but the control circuit becomes complicated
Solution Approach 1:
The patent merges the distortion correction function and color shift correction function into a single distortion correction circuit. By performing distortion correction on a color basis with color-specific warp parameters, the circuit simultaneously corrects both geometric distortion and color positional shifts without requiring separate adjustment circuits for each function.
Solution Approach 2:
The distortion correction circuit is designed to perform multiple functions: geometric distortion correction and color shift correction. By using color-specific warp parameters in the distortion correction process, the single circuit achieves both correction objectives, eliminating the need for separate dedicated adjustment circuits.
2Measurement precision
If separate adjustment circuits are used for each color to correct positional shifts, then color positional accuracy is improved, but the overall circuit complexity increases
Solution Approach 1:
The patent segments the distortion correction process into color-specific processing paths. By performing distortion correction separately for each color (red, green, blue) using color-specific warp parameters, the system achieves precise positional accuracy for each color while maintaining a unified circuit structure rather than requiring completely separate adjustment circuits.
Data Source
AI summary
A circuit apparatus is used in a laser projector that projects an image onto a projection surface by using laser beams having different wavelengths or a plurality of colors. The circuit apparatus includes a distortion correction circuit and an output circuit. The distortion correction circuit performs distortion correction on a color basis on display image data corresponding to the plurality of colors. The output circuit outputs the display image data as a result of the distortion correction. The distortion correction circuit performs the distortion correction on a color basis by using warp parameters different from one another among the plurality of colors.