Vehicle Display Device with Variable Reflectance Mirror
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display devices for vehicles that display rear-side images captured by imaging devices lack effective reflectance control and glare reduction, leading to suboptimal performance in mirror and display modes.
Innovation Solution
A display device with a reflectance control part and control circuit that adjusts reflectance and display states, incorporating a variable reflectance mirror with a polarizing part, liquid crystal part, and polarization reflection part to switch between mirror and display modes, and apply low reflection processing to reduce glare.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional display device is used to display rear-side images, then the display function is provided, but glare is generated and visibility is reduced
Solution Approach 1:
The patent applies a variable reflectance mirror that can dynamically change its reflectance between a first state (high reflectance for mirror mode) and a second state (low reflectance for display mode). This dynamic adjustment allows the system to adapt to different operating conditions, reducing glare when displaying images while maintaining mirror functionality when needed.
Solution Approach 2:
The patent changes the optical parameter of reflectance by using a variable reflectance mirror with controllable reflectance states. By adjusting the reflectance parameter between high and low states, the system eliminates glare during display operation while maintaining adequate light reflection for mirror functionality, directly resolving the glare-visibility contradiction.
2Illumination intensity
If the display is always on to show images, then image visibility is improved, but the mirror function is compromised
Solution Approach 1:
The variable reflectance mirror dynamically switches between high reflectance (mirror mode) and low reflectance (display mode) states based on operational requirements. This allows the single device to fulfill both mirror and display functions adaptively, resolving the contradiction between maintaining mirror functionality and enabling image display.
Solution Approach 2:
The patent integrates both mirror and display functions into a single device by using a variable reflectance mirror that can operate in two distinct states. This multi-functionality allows the display device to serve as both a traditional mirror and an image display device, eliminating the need for separate components and resolving the functional compromise.
3Illumination intensity
If the reflectance control part is added to control glare, then visibility is improved, but device complexity increases
Solution Approach 1:
The patent merges the reflectance control function directly into the mirror structure by using a variable reflectance mirror that combines the mirror substrate with controllable reflectance properties. This integration eliminates the need for separate glare control components, reducing overall device complexity while maintaining improved visibility through controlled reflectance adjustment.
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 enables improved reflectance control, reducing glare and enhancing visibility in both mirror and display modes, while meeting legal reflectance requirements and mitigating user discomfort due to image positioning.
Implementation Method 1
a liquid crystal part (2020) having a pair of substrates (2021, 2023) and a liquid crystal material (2025) sandwiched therebetween, and configured to change a polarization direction of light incident from the polarizing part (2010)
Implementation Method 2
a polarization reflection part (2030) arranged on an opposite side relative to the liquid crystal part (2020) from the polarizing part (2010), and configured to perform polarization reflection on light transmitted through the liquid crystal part (2020)
Data Source
AI summary
The display device is mounted on a vehicle and includes a display, a reflectance control part, and a control circuit. The display includes a display surface on which a video is displayed, and is able to switch between on and off. The reflectance control part is positioned close to the display surface and is able to change a reflectance of incident light. The control circuit is configured to control a reflectance of the reflectance control part, the on and off of the display, and the video. The display surface is subjected to low reflection processing for reducing a reflectance of light.