Polarization Conversion in Vehicle Displays for Even Color Imaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing projection display technologies suffer from uneven color rendering and imaging effects due to different colored lights having different wavelength ranges, leading to issues such as ghosting and reduced color rendering, particularly in reflective devices like windshields.
Innovation Solution
A picture generation apparatus utilizing a beam splitter and polarization conversion unit to separate and adjust the polarization directions of colored lights, ensuring that different colored lights follow distinct paths, thereby improving color rendering evenness and imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a camera is mounted on the rear view mirror to capture images of the driver's face, then the driver's drowsiness can be detected, but the driver may feel uneasy due to constant monitoring
Solution Approach 1:
The image generation apparatus captures images periodically at predetermined intervals rather than continuously, reducing the psychological burden on the driver while maintaining effective drowsiness detection through periodic monitoring
Solution Approach 2:
The system extracts only the necessary facial region from the captured image to generate the target image, focusing monitoring on specific areas (eyes, mouth) rather than the entire face, thereby reducing the feeling of constant surveillance while maintaining detection accuracy
2Measurement precision
If images are captured frequently to ensure accurate drowsiness detection, then detection accuracy improves, but the image generation time increases
Solution Approach 1:
The system performs preliminary processing by extracting only the necessary facial region from the captured image before generating the target image, reducing processing time while maintaining detection accuracy through focused analysis of key facial areas
Solution Approach 2:
The image generation unit extracts only the necessary region from the captured image to create the target image, reducing the amount of data to be processed and thereby decreasing image generation time while preserving detection accuracy
3Loss of information
If the entire captured image is used to generate the target image, then comprehensive information is obtained, but the image generation time increases
Solution Approach 1:
The system extracts only the necessary facial region from the captured image to generate the target image, focusing on key areas for drowsiness detection while discarding unnecessary background and other regions, thereby reducing processing time without losing critical information
Solution Approach 2:
The image generation apparatus applies different processing to different regions of the captured image, focusing detailed processing on the facial region while using simpler processing for other areas, optimizing the balance between information retention and processing efficiency
Data Source
Figure 1a~1b
Figure 1c
Figure 2~3
AI summary
A picture generation apparatus (100), a display device, and a transportation means are provided, to alleviate a display defect of a part of colored lights, and improve overall imaging effect. The picture generation apparatus (100) includes: a light source (110), configured to provide a light beam; and a beam splitting unit (120), configured to separate a linearly polarized polychromatic light from the light beam, and input the linearly polarized polychromatic light into a spatial light modulator (130), where the spatial light modulator (130) is configured to perform light modulation on the linearly polarized polychromatic light based on picture data, and input a modulated linearly polarized polychromatic light into a polarization conversion unit (140); and the polarization conversion unit (140) is configured to convert a polarization direction of a first colored light in the modulated linearly polarized polychromatic light, and output an imaging light, where the imaging light includes the first colored light and a second colored light whose polarization directions are perpendicular to each other.