Projection Display Light Masking for Uniform Illumination
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Solution Overview
Problem
Conventional projection type image display apparatuses face challenges in achieving uniform illumination distribution while increasing light masking, leading to nonuniformity and adverse effects on contrast performance, especially when light masking is performed at larger angles relative to the image display element.
Innovation Solution
A projection type image display apparatus using a light-masking unit with array lenses, where the light-masking area of lens cells adjacent to the optical axis is smaller than that of other cells, allowing for controlled light masking to maintain uniform illumination distribution and enhance contrast performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light-masking area is increased to increase the amount of light masking, then the dynamic range and contrast performance are improved, but the illumination distribution becomes nonuniform
Solution Approach 1:
The patent applies local quality by making the light-masking area of lens cells adjacent to the optical axis smaller than that of other lens cells. This non-uniform light-masking configuration compensates for the natural non-uniformity in illumination distribution, thereby maintaining overall uniformity while achieving increased total light masking for improved dynamic range and contrast performance.
2Illumination intensity
If light masking is performed at larger angles relative to the image display element to improve contrast performance, then the contrast is enhanced, but the image display element performance degrades
Solution Approach 1:
The patent employs asymmetry in the light-masking configuration by differentiating the light-masking area of lens cells based on their position relative to the optical axis. This asymmetric masking pattern optimizes the angular distribution of masked light, enhancing contrast performance while avoiding excessive incident angles that would degrade the image display element performance.
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 configuration enables a larger amount of light masking while maintaining uniform illumination distribution, thereby improving the dynamic range and contrast performance of the image display apparatus.
Implementation Method 1
makes uniform the light of the light source using two array lenses
Implementation Method 2
light-masking unit masks the array lens installed on the light source side in their particular area
Data Source
AI summary
According to the present invention, a projection type image display apparatus enables control of a large amount of light masking through a light-masking unit while maintaining a uniform illumination distribution in an area to be illuminated by the illumination light. The apparatus uses two array lenses on which lens cells are arranged in matrix form, where light-masking unit masks the array lens installed on the light source side in their particular area. The light-masking unit adjusts the amount of light emitted from the light source. The light-masking area of lens cells adjacent to lens cells closest to an optical axis is made smaller than the light-masking area of other cells.