Projector Optical Path Shifting for Red-Band Color Accuracy
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Solution Overview
Problem
Existing projectors face issues with reduced response speed and color deviation due to thin liquid crystal layers, leading to decreased brightness and color tone deterioration, particularly in the red wavelength band.
Innovation Solution
The projector employs multiple liquid crystal panels with varying thicknesses and frame rates, along with a biaxial shifting device to optimize optical path shifting, ensuring high rotation efficiency and frame rates to maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the thickness of the liquid crystal layer is reduced to increase response speed, then the response speed is improved, but the rotation efficiency in the red wavelength band decreases causing color deviation and brightness loss
Solution Approach 1:
The invention divides the liquid crystal display system into multiple panels with different liquid crystal layer thicknesses for different wavelength bands. Specifically, the green liquid crystal panel has a first thickness optimized for green light, while the red liquid crystal panel has a second thickness (greater than the first) optimized for red light. This segmentation allows each panel to be optimized for its specific wavelength band, preventing color deviation while maintaining high response speeds across all colors.
2Productivity
If the thickness of the liquid crystal layer is reduced to increase frame rate, then the frame rate is improved, but the brightness and color tone deteriorate
Solution Approach 1:
The system segments the display into multiple liquid crystal panels with different thicknesses optimized for different wavelength bands. The red liquid crystal panel uses a greater thickness than the green panel, ensuring sufficient light modulation for brightness in the red band while all panels operate at high frame rates. This resolves the contradiction between high frame rate and brightness maintenance.
Solution Approach 2:
Each liquid crystal panel is given a specific local quality in terms of thickness according to its wavelength band requirements. The red liquid crystal panel has a greater thickness locally optimized for red light transmission and modulation, while green and blue panels have thinner layers optimized for their respective bands. This local optimization ensures each panel delivers optimal brightness and color purity at high frame rates.
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 prevents color deviation and brightness loss by balancing liquid crystal layer thickness and frame rates, enhancing image clarity and definition.
Implementation Method 1
a first liquid crystal panel configured to modulate light in a first wavelength band to generate first image light, a second liquid crystal panel configured to modulate light in a second wavelength band
Implementation Method 2
the rotation efficiency of the liquid crystal is maximized
Implementation Method 3
a light combining element configured to combine the first image light and the second image light to generate composite image light
Implementation Method 4
an optical shifting device configured to shift an optical path of at least one of the first image light, the second image light, and the composite image light
Data Source
AI summary
A projector includes a first liquid crystal panel configured to modulate light in a first wavelength band to generate first image light, a second liquid crystal panel configured to modulate light in a second wavelength band having a center wavelength longer than a center wavelength of the first wavelength band to generate second image light, a light combining element configured to combine the first image light and the second image light to generate composite image light, a projection optical system configured to project the composite image light, and an optical shifting device configured to shift an optical path of at least one of the first image light, the second image light, and the composite image light, wherein a thickness of a liquid crystal layer of the second liquid crystal panel is larger than a thickness of a liquid crystal layer of the first liquid crystal panel, and a frame rate of the first liquid crystal panel is higher than a frame rate of the second liquid crystal panel.