Asymmetric Light Homogenizing Element for Projection Sharpness
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Solution Overview
Problem
Existing projection devices suffer from light beam non-uniformity due to optical path differences, resulting in poorly focused light spots on the light valve, especially at positions farther from the light homogenizing element, which affects image sharpness.
Innovation Solution
A light homogenizing element with a non-planar light-emitting surface, featuring sides of different lengths and non-parallel angles, ensuring that all endpoints have unique vertical projection positions on the central axis, allowing for flexible design and improved focusing of light beams across the light valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the light homogenizing element is disposed obliquely relative to the light valve, then the light beam can be transmitted to the light valve, but a portion of the light spot formed on the light valve that is farther away from or closer to the light homogenizing element will not be focused sharply due to optical path difference
Solution Approach 1:
The light-emitting surface is designed with asymmetric geometry where the first side is not parallel to the second side, and the light-emitting surface is not parallel to the light incident surface. This asymmetric structure compensates for the optical path differences caused by oblique disposition, enabling all portions of the light spot to be focused sharply on the light valve simultaneously.
Solution Approach 2:
The patent introduces a non-planar light-emitting surface with varying vertical projection positions of endpoints on the central axis. This dimensional variation along the central axis compensates for the optical path differences in different regions, allowing uniform focusing across the entire light valve surface despite oblique arrangement.
2Volume of moving object
If the light homogenizing element is disposed obliquely relative to the light valve, then the device structure can be compact, but the portion of the light spot at a position far from the light homogenizing element is not well focused
Solution Approach 1:
The asymmetric light-emitting surface design with non-parallel sides and non-planar configuration enables compact oblique arrangement while maintaining uniform focusing quality across the light valve, particularly improving the focus of light spot portions far from the light homogenizing element.
Solution Approach 2:
The patent varies the vertical projection positions of the endpoints on the central axis, creating a non-uniform geometric configuration that compensates for optical path differences and maintains focusing quality in compact oblique arrangements.
3Manufacturing precision
If the light-emitting surface has non-parallel sides and unique vertical projection positions, then all portions of the light spot can be sharply focused simultaneously, but the device complexity increases
Solution Approach 1:
The asymmetric light-emitting surface with non-parallel sides and varying vertical projection positions achieves uniform focusing across all light spot portions. The complexity is managed by implementing the asymmetry only in the light-emitting surface geometry while maintaining a relatively simple overall structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design ensures that light spots on the light valve are sharply focused in all portions simultaneously, enhancing image sharpness and correcting for optical path differences, thereby improving the overall performance of the projection device.
Implementation Method 1
a light beam is emitted from the light homogenizing element and transmitted to the light valve... due to the optical path difference
Data Source
AI summary
A light homogenizing element comprising a light incident surface, a light-emitting surface and a plurality of side surfaces is provided. The plurality of side surfaces are connected between the light incident surface and the light-emitting surface, the light-emitting surface is not parallel to the light incident surface, and the light-emitting surface includes a first side and a second side opposite to the first side, and the first side is not parallel to the second side. A projection device using the light homogenizing element is also provided.