Polarized Projection Optics With Dichroic Layer for Higher Contrast
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing image projection systems, such as in-vehicle head-up displays, do not provide sufficient clarity and contrast for projected images, making them difficult to see.
Innovation Solution
Incorporating a light absorption anisotropic layer containing dichroic substances between the image projection device and the screen, with a transmittance central axis aligned towards the screen, to absorb light not parallel to this axis, enhancing image contrast and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional image projection device is used without additional optical layers, then the device structure remains simple, but the projection image lacks sufficient contrast and visibility
Solution Approach 1:
A light absorption anisotropic layer is introduced as an intermediary component between the image projection device and the screen. This layer selectively absorbs light based on its polarization direction, allowing the projection image to achieve high contrast and visibility without complicating the overall device structure. The layer acts as a mediator that transforms the polarization state of light to enhance image quality.
Solution Approach 2:
The light absorption anisotropic layer changes the polarization parameter of light passing through it. By aligning the absorption axis of the dichroic substance in the layer with the polarization direction of the projection light, the system maximizes light transmission for the image while absorbing peripheral light, thereby enhancing image visibility through parameter optimization.
2Illumination intensity
If light is allowed to pass through all directions to the screen, then the screen receives sufficient overall light, but peripheral light interference reduces image contrast
Solution Approach 1:
The light absorption anisotropic layer exhibits local quality in its light absorption characteristics. It selectively absorbs light based on the polarization direction, allowing light parallel to the transmittance central axis to pass through while absorbing light in other directions. This local differentiation eliminates peripheral light interference while maintaining sufficient overall light transmission to the screen.
Solution Approach 2:
The dichroic substance in the light absorption anisotropic layer exhibits dichroism, which is a form of optical property change based on light polarization. This property allows the layer to differentially transmit and absorb light based on its polarization state, effectively filtering out peripheral light that would otherwise interfere with image contrast while maintaining overall illumination.
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 solution improves the visibility and contrast of projected images by minimizing peripheral light interference, allowing observers to easily recognize the projection image.
Implementation Method 1
a light absorption anisotropic layer which is disposed between the image projection device and the screen and through which the projection light passes, in which the light absorption anisotropic layer contains a dichroic substance
Implementation Method 2
a transmittance central axis of the light absorption anisotropic layer is in a direction toward the screen
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present invention provides an image projection system in which a projection image is easier to see. An image projection system according to an embodiment of the present invention has: an image projection device which emits projection light that is linearly polarized light; a screen which is irradiated with the projection light emitted from the image projection device; and a light absorption anisotropic layer which is disposed between the image projection device and the screen and through which the projection light passes, the light absorption anisotropic layer contains a dichroic substance, and a transmittance central axis of the light absorption anisotropic layer is in a direction toward the screen.