Electrochromic Rearview Mirror Reducing Hue Shift
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Solution Overview
Problem
Electrochromic rearview mirrors face challenges in maintaining color accuracy and minimizing perceived color change when transitioning between high and low transmittance states, leading to undesirable hue shifts that affect the display's visibility and accuracy.
Innovation Solution
The electrochromic system incorporates a display device with a light source that emits primary colors, such as red, green, and blue, and a partially transmissive, partially reflective electrode, which adjusts between high and low transmittance states while maintaining a minimal hue difference of less than 31 degrees, ensuring consistent color perception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the electrochromic medium adjusts between high and low transmittance states, then the glare protection function is improved, but the perceived color change of the display increases
Solution Approach 1:
The patent applies color change principles by carefully selecting the hues of primary colors (red, green, blue) emitted by the display device so that their hue differences between high and low transmittance states are controlled to be less than 31 degrees. This ensures that while the electrochromic medium changes transmittance for glare protection, the perceived color change of the display remains minimal and acceptable to users.
2Object-affected harmful factors
If the transmittance is reduced for night mode, then the glare protection is improved, but the display visibility deteriorates
Solution Approach 1:
The patent applies parameter change principles by optimizing the hue parameters of the display's primary colors. By controlling the hue difference to be less than 31 degrees between transmittance states, the display maintains adequate visibility in night mode while the electrochromic medium provides glare protection. This parameter optimization allows the system to achieve both glare reduction and acceptable display visibility simultaneously.
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 reduces the perceived color change, maintaining color accuracy and consistency across transmittance states, enhancing the display's visibility and reliability in rearview mirrors.
Implementation Method 1
an electro-optic medium in optical communication between the front element and the rear element, wherein the electro-optic medium is configured to adjust between at least a high transmittance state and a low transmittance state
Implementation Method 2
a display device with a light source that emits primary colors, such as red, green, and blue
Implementation Method 3
a partially transmissive, partially reflective electrode, which adjusts between high and low transmittance states while maintaining a minimal hue difference of less than 31 degrees
Data Source
AI summary
An electro-optic system is provided that includes a front element having first and second surfaces, a rear element including third and fourth surfaces, wherein the front and rear elements are sealably bonded together in a spaced-apart relationship to define a chamber, and an electro-optic medium contained in the chamber, and the electro-optic medium is adapted to be in at least a high transmittance state and a low transmittance state. The electro-optic system further includes a display device in optical communication with the electro-optic element, the display device including at least one light source and is configured to emit at least a first primary and a second primary, the first and second primaries each having a first hue (hab) when viewed through the electro-optic element in approximately the high transmittance state and a second hue (hab′) when viewed through the electro-optic element in approximately the low transmittance state, wherein a change in the first and second hues (Δhab) for both first and second primaries is less than approximately 31 degrees.