Electronic Mirror Polarizer Haze Tuning for Anti-Glare Visibility
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Solution Overview
Problem
Electronic mirrors with anti-glare functions can reduce user visibility due to increased reflected light and scattering, leading to phenomena like white blur, double reflection, and rainbow effects.
Innovation Solution
The electronic mirror incorporates a configuration with a first polarization plate, a liquid crystal layer, a reflection-type polarization plate, a second polarization plate, a liquid crystal cell, and a backlight, where the haze of the second polarization plate is within 3.0% to 8.0%, and the reflection-type polarization plate and second polarization plate are adhered by an adhesive member. This configuration adjusts the applied voltage to the liquid crystal layer based on illuminance sensors to control reflectance and suppress unwanted reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an anti-glare function is provided in an electronic mirror, then reflected light from surrounding vehicles is reduced, but user visibility deteriorates due to white blur, double reflection, and rainbow effects
Solution Approach 1:
The patent applies anti-glare processing to the second polarization plate, which changes the optical parameters of the plate by introducing controlled haze (3.0% to 8.0%). This parameter change allows the plate to scatter harmful reflected light while maintaining sufficient visibility for the user, resolving the contradiction between glare reduction and visibility preservation
Solution Approach 2:
The patent uses a composite structure combining multiple polarization plates with different properties. The first polarization plate maintains high transparency for normal viewing, while the second polarization plate incorporates anti-glare processing with specific haze characteristics. This composite approach allows the system to simultaneously achieve glare reduction and visibility maintenance
2Object-generated harmful factors
If the haze of the second polarization plate is increased to suppress reflections, then white blur and double reflection are reduced, but transmission loss increases
Solution Approach 1:
The patent precisely controls the haze parameter of the second polarization plate within the range of 3.0% to 8.0%. This optimized parameter range is sufficient to suppress white blur and double reflection effects while minimizing transmission loss, achieving the best balance between harmful factor suppression and energy efficiency
Solution Approach 2:
The anti-glare processing is applied specifically to the second polarization plate rather than uniformly across all optical components. This localized application of haze creates different optical qualities in different parts of the system, allowing suppression of reflections at the critical second plate while maintaining high transmission through the first polarization plate
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 suppresses the occurrence of white blur, double reflection, and rainbow effects, thereby improving user visibility and maintaining the operability of vehicles.
Implementation Method 1
a liquid crystal layer disposed on a back surface side of the first polarization plate and configured to control optical rotation of light by an applied voltage
Implementation Method 2
a reflection-type polarization plate disposed on a back surface side of the liquid crystal layer and configured to reflect or transmit light from the liquid crystal layer based on a polarization axis
Implementation Method 3
a liquid crystal cell disposed on a back surface side of the second polarization plate
Data Source
AI summary
An electronic mirror includes: a first polarization plate; a liquid crystal layer disposed on a back surface side of the first polarization plate and configured to control optical rotation of light by an applied voltage; a reflection-type polarization plate disposed on a back surface side of the liquid crystal layer and configured to reflect or transmit light from the liquid crystal layer based on a polarization axis; a second polarization plate disposed on a back surface side of the reflection-type polarization plate; a liquid crystal cell disposed on a back surface side of the second polarization plate; and a backlight disposed on a back surface side of the liquid crystal cell, and haze of the second polarization plate is within a range of 3.0% to 8.0%.