Tilted Transmissive Substrate for Projector Color Boundary
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Solution Overview
Problem
Projectors with color liquid crystal displays (LCDs) face issues with conspicuous color boundaries when displaying images in an enlarged manner, making the image appear unnatural.
Innovation Solution
A projector configuration that includes a light source device, a light modulation device with pixels of different colors, and a tilted light transmissive substrate to increase astigmatism, which overlaps adjacent colors and makes the color boundary fuzzy, thereby making it inconspicuous.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a color filter with regularly arranged red, green, and blue pixels is used, then the light modulation device can display multiple colors, but the boundary between colors becomes conspicuous when displaying images in an enlarged manner
Solution Approach 1:
The patent introduces a tilted light transmissive substrate that changes the optical parameters of the system by inducing astigmatism. This parameter change causes adjacent color pixels to overlap optically, softening the color boundaries and making them inconspicuous while preserving the multi-color display capability
Solution Approach 2:
The tilted light transmissive substrate acts as an intermediary optical element between the light modulation device and the projection optical device. It mediates the light path by introducing controlled astigmatism that overlaps adjacent colors, thereby solving the boundary problem without affecting the fundamental color display function
2Object-affected harmful factors
If the light transmissive substrate is tilted to increase astigmatism and make color boundaries inconspicuous, then the image appearance is improved, but the astigmatism of the projection optical device is increased
Solution Approach 1:
The patent converts the harmful effect of increased astigmatism into a beneficial outcome. By deliberately tilting the light transmissive substrate to increase astigmatism, the system achieves the desired color boundary softening effect, transforming what would normally be an optical defect into a useful feature for improving image appearance
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
The increased astigmatism due to the tilted substrate effectively makes the color boundary inconspicuous, resulting in a more natural and preferable image display, while simplifying the projector configuration by using a single light modulation unit and optimizing color settings based on color characteristics.
Implementation Method 1
the light transmissive substrate is disposed so as to be tilted with respect to an imaginary plane perpendicular to a light axis of the light beam modulated by the first light modulation unit... the astigmatism of the projection optical device is increased
Data Source
AI summary
A projector includes: a light source device; a light modulation device adapted to modulate a light beam emitted from the light source device; a light transmissive substrate adapted to transmit the light beam modulated by the light modulation device; and a projection optical device adapted to project the light beam transmitted through the light transmissive substrate, wherein the light modulation device includes a first light modulation unit having a plurality of pixels arranged, the pixels having colors different from each other, and the light transmissive substrate is disposed so as to be tilted with respect to an imaginary plane perpendicular to a light axis of the light beam modulated by the first light modulation unit.