Image Projection System With Gradation Inversion for Monochromatic Light
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Solution Overview
Problem
Existing image projection systems using monochromatic light, such as yellow light, often result in projection images with low visibility due to uniform illumination, making characters and figures difficult to read.
Innovation Solution
The image projection system inverts the gradation of at least a partial region of the input image in response to a predetermined condition, such as an operator input, to enhance visibility by increasing the contrast between irradiated and non-irradiated regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If monochromatic light is used for projection, then the light source can be simple and cost-effective, but the visibility of the projection image deteriorates due to uniform illumination
Solution Approach 1:
The patent inverts the gradation of the input image before projection. Instead of projecting the image as-is with uniform monochromatic light, the control unit inverts the brightness levels (dark regions become bright, bright regions become dark) so that when projected with monochromatic light, the contrast is enhanced and visibility is improved. This inversion compensates for the uniform illumination characteristic of monochromatic light sources.
2Device complexity
If the input image is projected directly with uniform illumination, then the projection system is simple, but the contrast between background and characters/figures is low making readability poor
Solution Approach 1:
The patent applies preliminary action by processing the input image before it reaches the projection optical system. The control unit inverts the gradation of the input image in advance, so that when the image is projected with uniform monochromatic light, the desired contrast and readability are achieved. This preliminary image processing compensates for the limitations of the projection system without requiring complex optical components.
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 approach results in a projection image with improved readability by increasing the illuminance difference between background and characters/figures, making the image more easily viewable.
Implementation Method 1
a light source to emit light
Implementation Method 2
an image display element to modulate the light emitted from the light source to display an image based on an input image
Implementation Method 3
a projection optical system to project the image displayed by the image display element
Data Source
AI summary
An image projection system includes a light source to emit light, an image display element to modulate the light emitted from the light source to display an image based on an input image, a projection optical system to project the image displayed by the image display element, and a control unit to invert gradation of at least a partial region of the input image based on a command information generated when a predetermined condition is satisfied.