Optical Module Aspect Ratio Matching for Virtual Image Distortion
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Solution Overview
Problem
Existing virtual image display devices face issues with distortion correction, particularly when the virtual image formed is distorted in a fan shape, leading to color unevenness at the upper and lower ends, and require increased capacity in line memory for correction processing.
Innovation Solution
An optical module with a first display panel and a control unit that corrects input images based on distortion generated in the optical system, where the aspect ratio of the input image signal is smaller than the display panel, allowing the display panel to display the corrected image without dividing the effective display region into blank regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the effective display region of the display panel is divided into three regions with upper and lower blank regions to correct fan-shaped distortion, then color unevenness at the upper and lower ends is eliminated, but the capacity of line memory increases
Solution Approach 1:
The patent changes the aspect ratio parameter of the display panel to match the aspect ratio of the input image signal. By setting the display panel's aspect ratio equal to the input image aspect ratio, the need for blank regions is eliminated while maintaining proper distortion correction, thus reducing line memory capacity requirements without sacrificing image quality
Solution Approach 2:
The patent extracts and removes the blank regions from the display panel configuration. By eliminating the upper and lower blank regions through proper aspect ratio matching, the system achieves distortion correction using only the effective display region, thereby reducing the memory capacity needed for correction processing
2Reliability
If the effective display region is divided into blank regions to prevent obscure images, then image clarity is improved, but the display area is reduced
Solution Approach 1:
The patent modifies the aspect ratio parameter of the display panel to match the input image signal's aspect ratio. This parameter change allows the entire display area to be utilized for displaying corrected images without requiring blank regions, thereby maintaining image clarity while maximizing display area
3Reliability
If distortion correction is applied to fan-shaped virtual images, then color unevenness is eliminated, but the complexity of correction processing increases
Solution Approach 1:
The patent simplifies correction processing by changing the aspect ratio parameter of the display panel to match the input image. This parameter alignment eliminates the need for complex correction algorithms and blank region management, reducing processing complexity while maintaining image quality through straightforward aspect ratio matching
Data Source
AI summary
An optical module according to the present disclosure includes: a first display panel that emits a first image light, a first virtual image optical system that forms a first exit pupil of the first image light, and a control unit corrects a video image signal to a first correction video signal based on distortion generated in the first optical system, an aspect ratio of the video image signal being smaller than an aspect ratio of the first display panel, wherein the control unit causes the first display panel to emit the first image light from the first display panel based on the first correction video image signal.