Projector Pixel Shifting Device Suppresses Color Mixture
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Solution Overview
Problem
Existing projectors face challenges in suppressing color mixture and enhancing image quality, particularly in enlarging and projecting images, where the inter-pixel portions tend to be recognized, leading to reduced color purity.
Innovation Solution
A projector configuration that includes a light source, a light modulation section with a pixel region segmented by a black matrix, a projection system, and a pixel shifting device. The pixel shifting device shifts the optical path of image light to position it at specific display positions, ensuring that the image light from a reference unit pixel does not overlap with adjacent pixels, thereby superimposing it on the black matrix regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution is increased in a pseudo manner by shifting the optical path, then the apparent resolution is improved, but color mixture occurs between adjacent pixels reducing color purity
Solution Approach 1:
The patent divides the pixel region into multiple unit pixels segmented by black matrices, and further segments the optical path by introducing multiple optical path shifts. Each unit pixel's light is directed to different display positions through optical path shifting, effectively separating the light paths to prevent color mixture while maintaining high apparent resolution.
Solution Approach 2:
The patent introduces a new dimension of optical path shifting beyond the traditional single path. By shifting the optical path multiple times and directing light from unit pixels to different display positions (first, second, third display positions), the system creates a multi-dimensional optical path structure that prevents overlap between adjacent pixels while enhancing resolution.
2Area of stationary object
If the image is enlarged and projected, then the projection size is increased, but inter-pixel portions become recognizable reducing image quality
Solution Approach 1:
The patent applies preliminary optical path shifting before the light reaches the projection lens. By pre-shifting the optical path of light from each unit pixel to different display positions, the system ensures that even after enlargement, the inter-pixel portions do not align with visible regions on the projection surface, thereby preventing their recognition while maintaining large projection size.
3Adaptability or versatility
If color light from a pixel is mixed with light from an adjacent pixel, then the optical paths overlap, but this reduces the color purity of the image
Solution Approach 1:
The patent applies different optical path shifts to different unit pixels within the pixel region. Each unit pixel is directed to a specific display position (first, second, or third display position) based on its local position and the black matrix segmentation. This localized optical path control ensures that color light from each unit pixel does not mix with adjacent pixels, maintaining color purity while allowing flexible optical path routing.
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 effectively reduces the visibility of inter-pixel portions and suppresses color mixture, resulting in improved image quality and increased apparent resolution without compromising color purity.
Implementation Method 1
a pixel shifting device that is disposed between the light modulation section and the projection system and shifts an optical path of the image light output from the light modulation section
Data Source
AI summary
A projector according to an aspect of the present disclosure includes a light modulation section that has a pixel region containing a plurality of unit pixels segmented by a black matrix, a projection system, and a pixel shifting device that shifts the optical path of image light output from the light modulation section. One of the plurality of unit pixels in the pixel region is set as a reference unit t pixel, and the pixel shifting device superimposes the image light output from the reference unit pixel at a shifted display position on the region corresponding to the black matrix and surrounding the reference unit pixel at a reference display position in such a way that the image light does not overlap with other unit pixels adjacent to the reference unit pixel out of the unit pixels.