Semi-Transmissive LCD Rearview Mirror for Blind Spot Elimination
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Solution Overview
Problem
Existing rearview mirrors for vehicles have a blind area of viewing field, especially when turning, which poses a significant risk to driving safety.
Innovation Solution
A rearview system incorporating an image pick-up device and a liquid crystal display device with a semi-transmissive and semi-reflective functional layer, which transmits backlight light when on and reflects ambient light when off, along with a wide-angle liquid crystal display panel and a direct type backlight module with LED light sources, to provide a wide-angle view and eliminate blind spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional rearview mirror is used, then the structure is simple and cost is low, but blind areas exist in the viewing field especially when turning
Solution Approach 1:
The rearview system segments the viewing function into multiple components: an image pickup device captures wide-angle images of blind areas, while a liquid crystal display device presents the processed images to the driver. This segmentation allows elimination of blind spots without requiring a completely different mirror structure.
Solution Approach 2:
The liquid crystal display device serves multiple functions: it displays real-time images from the image pickup device to eliminate blind areas, and simultaneously acts as a reflective mirror when the backlight is off. This multi-functionality integrates blind spot elimination with conventional rearview functionality in a single device.
2Adaptability or versatility
If a liquid crystal display device with semi-transmissive and semi-reflective functional layer is used, then the device can function as both display and normal reflector, but the device complexity increases
Solution Approach 1:
The liquid crystal display device is designed with a semi-transmissive and semi-reflective functional layer that enables it to perform both display and reflection functions. When the backlight module is on, it transmits light to display images; when off, it reflects ambient light to serve as a conventional mirror, providing dual functionality in one device.
Solution Approach 2:
The optical properties of the liquid crystal display device are dynamically controllable through the backlight module. By switching the backlight state, the device dynamically transitions between transmissive display mode and reflective mirror mode, adapting to different usage scenarios as needed.
3Area of stationary object
If a wide-angle liquid crystal display panel is used to eliminate blind areas, then the viewing field coverage is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The system addresses the limited viewing field of conventional mirrors by adding a temporal dimension - capturing images from wide-angle positions and presenting them in real-time on the liquid crystal display. This transforms the spatial limitation into a time-based solution where multiple viewing angles are sequentially presented.
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 system effectively eliminates blind areas by displaying a wide-angle image of the vehicle's surroundings and functions as both a displayable and normal reflector, enhancing driving safety and meeting various user needs.
Implementation Method 1
The semi-transmissive and semi-reflective functional layer is configured to transmit light emitted by the backlight module when the backlight module is turned on and to reflect external ambient light when the backlight module is turned off
Implementation Method 2
a liquid crystal display panel, a semi-transmissive and semi-reflective functional layer arranged between the backlight module and the liquid crystal display panel
Implementation Method 3
the light source is configured to emit light and diffuse the emitted light
Implementation Method 4
a diffuser, and one or more optical films; and the light source is configured to emit light and diffuse the emitted light
Implementation Method 5
the night vision image pick-up device may include an infrared lighting unit and an image pick-up unit
Data Source
AI summary
A rearview system for a vehicle and a vehicle having the rearview system are disclosed. The rearview system includes: an image pick-up device configured to acquire an image showing a condition beside and behind the vehicle; and a liquid crystal display device configured to display the image acquired by the image pick-up device in real time. The liquid crystal display device comprises a backlight module, a liquid crystal display panel, a semi-transmissive and semi-reflective functional layer arranged between the backlight module and the liquid crystal display panel. The semi-transmissive and semi-reflective functional layer is configured to transmit light emitted by the backlight module when the backlight module is turned on and to reflect external ambient light when the backlight module is turned off.