Electronic Zoom Center Alignment for Lens Shift in Projectors
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Solution Overview
Problem
Liquid crystal projectors face challenges in maintaining high luminance during zooming due to variations in lens shift positions, requiring appropriate zooming adjustments to align angles of view, especially when using lens-interchangeable systems, and fixed focal lenses prefer electronic zooming over optical zooming to achieve optimal image projection.
Innovation Solution
An image projection apparatus with an electronic zoom unit that adjusts the size of the image formation area on a light modulation element by electronic zooming centered at a predetermined position, controlled by a unit that manages the optical axis displacement relative to the image formation center, allowing for precise electronic zooming based on lens information such as shift position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electronic zooming is performed with the image formation center as the reference, then the zooming operation is simple, but the projection image luminance becomes non-uniform when the lens optical axis is displaced from the image formation center
Solution Approach 1:
The patent applies local quality by dynamically adjusting the zoom reference position based on lens shift detection. When the lens optical axis is displaced from the image formation center, the system shifts the electronic zoom reference position to align with the displaced optical axis, ensuring uniform luminance distribution across the projection image while maintaining simple zooming operation.
Solution Approach 2:
The system changes the parameter of zoom reference position dynamically based on lens shift amount. By detecting the lens optical axis position and adjusting the electronic zoom center accordingly, the system maintains optimal luminance uniformity across different lens configurations while keeping the zooming operation straightforward.
2Manufacturing precision
If optical zooming is used to adjust image size, then image quality is maintained, but the angle of view cannot be properly aligned when lens shift position varies
Solution Approach 1:
The patent replaces mechanical optical zooming with electronic zooming that dynamically adjusts the reference position based on lens shift detection. This substitution maintains image quality through proper electronic scaling while achieving adaptable angle of view alignment by shifting the zoom center to match the lens optical axis position, eliminating the alignment problems of traditional optical zooming.
Solution Approach 2:
The system introduces dynamics by making the zoom reference position variable rather than fixed. The electronic zoom center is dynamically adjusted according to the detected lens shift position, enabling the system to adapt to different lens configurations and maintain proper angle of view alignment while preserving image quality.
3Illumination intensity
If the image formation area is shifted to align with the lens optical axis, then luminance uniformity improves, but the zooming center becomes misaligned
Solution Approach 1:
The patent changes the parameter of zoom reference position to match the shifted image formation area. By detecting the lens optical axis position and setting the electronic zoom center at the same location, the system simultaneously achieves luminance uniformity through proper alignment and maintains ease of operation with a correctly positioned zoom center.
Data Source
AI summary
An image projection apparatus (1) is an image projection apparatus in which an optical axis of a projection lens (19) for projecting an image and a center position of an image formation area on a light modulation element (32) may be displaced relative to each other, and the image projection apparatus includes electronic zoom means (13) for magnifying or reducing a size of the image formation area on the light modulation element by electronic zooming centered at a predetermined position, and control means (14) for controlling the electronic zoom unit to perform the electronic zooming with the predetermined position as the optical axis.