Polarized Transparent Screen to Suppress Rear Image Light Leakage
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Solution Overview
Problem
Existing image projection systems in vehicles fail to provide a favorable viewing environment for both the driver and passenger, as they often result in image light leakage and interference with the background view.
Innovation Solution
A screen with a corrugated surface and an optical element unit that emits image light in a predetermined polarized state, utilizing reflection surfaces for diffusion and reflection, and an optical element unit to restrict image light transmission, creating a transparent screen that suppresses image light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a transparent screen is used to allow background view, then transparency is improved, but image light leakage to the back side worsens
Solution Approach 1:
The patent applies parameter changes by utilizing the polarized state of image light and configuring the optical element unit accordingly. The optical element unit is configured in accordance with a polarized state of the image light to restrict transmission of the image light to the back side while maintaining transparency for normal viewing. This changes the optical parameters of the screen to achieve both transparency and light leakage prevention.
Solution Approach 2:
The patent employs composite materials by combining the corrugated surface with the optical element unit in a integrated screen structure. The screen includes both the corrugated surface for image display and the optical element unit for selective light transmission control, creating a composite structure that simultaneously achieves transparency and prevents image light leakage.
2Object-generated harmful factors
If the optical element unit restricts transmission of image light to the back side, then image light leakage is suppressed, but transmission of light from the back side worsens
Solution Approach 1:
The optical element unit is configured in accordance with a polarized state of the image light, which allows it to selectively restrict transmission of image light to the back side while still transmitting at least part of light entering from the back side. This parameter-based configuration enables differential light transmission control.
3Illumination intensity
If the corrugated surface diffuses and reflects image light, then image display to front side viewer is improved, but image light transmission to back side worsens
Solution Approach 1:
The patent segments the screen into two functional parts: the corrugated surface for image display and the optical element unit for light transmission control. The corrugated surface includes a plurality of reflection surfaces that diffuse and reflect image light to the front side, while the optical element unit separately handles the restriction of light transmission to the back side.
Solution Approach 2:
The optical element unit is configured in accordance with a polarized state of the image light to selectively restrict transmission of the image light to the back side. This parameter-based control allows the system to maintain the light-diffusing function of the corrugated surface while preventing harmful light leakage.
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 provides a favorable viewing environment by diffusing and reflecting image light while allowing transparency, preventing image light leakage and enhancing visibility for the viewer.
Implementation Method 1
The corrugated surface includes a plurality of reflection surfaces, the plurality of reflection surfaces having light transmissivity and diffusing and reflecting the emitted image light
Implementation Method 2
The corrugated surface includes a plurality of reflection surfaces, the plurality of reflection surfaces having light transmissivity and diffusing and reflecting the emitted image light
Implementation Method 3
The optical element unit is configured in accordance with a polarized state of the image light on a second side opposite to a first side of the corrugated surface on which the image light is emitted, restricts transmission of the image light to the second side
Data Source
AI summary
There is provided a screen that displays an image in accordance with emission of image light including light in a predetermined polarized state as a major component and includes a corrugated surface and an optical element unit. The corrugated surface includes a plurality of reflection surfaces, the plurality of reflection surfaces having light transmissivity and diffusing and reflecting the emitted image light. The optical element unit is configured in accordance with a polarized state of the image light on a second side opposite to a first side of the corrugated surface on which the image light is emitted, restricts transmission of the image light to the second side, and transmits at least part of light entering from the second side.