Projection Display Unit High Dynamic Range Optical Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Increasing the dynamic range in projection display units leads to deterioration in optical utilization efficiency, which is not effectively addressed by existing technologies.
Innovation Solution
A projection display unit is designed with a first spatial light modulator and an integrator optical system that separates high-luminance regions, allowing the first spatial light modulator to form only the high-luminance region while maintaining luminance in other areas, using a second spatial light modulator to illuminate the integrator optical system with light from a second light source, thereby achieving high dynamic range without compromising optical utilization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the dynamic range is increased to achieve high-luminance representation, then the luminance level is improved, but the optical utilization efficiency deteriorates
Solution Approach 1:
The patent divides the image into high-luminance regions and standard-luminance regions, processing them through different optical paths. The high-luminance region is formed using only light from the first light source through the first spatial light modulator, while the standard-luminance region utilizes both the first light source and the second light source. This segmentation allows the system to achieve high peak luminance in specific regions without compromising overall optical efficiency.
Solution Approach 2:
The patent applies different optical processing qualities to different regions of the image. The high-luminance region receives dedicated optical resources (first light source only) to achieve peak luminance, while the standard-luminance region utilizes combined optical resources (both light sources) for optimal efficiency. This local differentiation resolves the contradiction by providing high luminance only where needed rather than uniformly across the entire image.
2Illumination intensity
If the first spatial light modulator processes the entire image, then the luminance is maintained, but the optical utilization efficiency deteriorates due to the need to form only high-luminance regions
Solution Approach 1:
The patent segments the image processing function between two spatial light modulators. The first spatial light modulator processes only the high-luminance region, while the second spatial light modulator processes the standard-luminance region. This functional segmentation allows each modulator to operate optimally for its specific region, improving overall optical utilization efficiency while maintaining the required luminance levels.
Solution Approach 2:
The patent extracts the high-luminance region processing from the overall image processing function and handles it separately through the first spatial light modulator. This extraction allows the main image processing (standard-luminance regions) to proceed through the second spatial light modulator with optimized optical efficiency, while the high-luminance regions receive dedicated processing resources only when needed.
Data Source
AI summary
A projection display unit includes a first spatial light modulator that first light enters; and an integrator optical system that second light and light passing through the first spatial light modulator enter.