Electronic Mirror Backlight Peak Angle Alignment
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Solution Overview
Problem
Conventional electronic mirror devices for vehicle interiors suffer from luminance deterioration of visually recognized images, leading to degraded visibility due to mismatched sight line and maximum luminance directions, and increased power consumption when attempting to enhance luminance.
Innovation Solution
An electronic mirror device with a liquid crystal display and a backlight where the peak angle of the backlight is directed downward, aligning the maximum luminance direction with the driver's sight line, reducing luminance loss and eliminating the need for increased backlight power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the backlight luminance is increased to improve visibility, then the luminance of the display image is improved, but the power consumption increases
Solution Approach 1:
The patent applies local quality by creating a non-uniform luminance distribution across the display surface. The center region has higher luminance to match the driver's focal attention area, while peripheral regions have reduced luminance. This is achieved through spatially selective backlight control, where different zones of the backlight unit are controlled independently to optimize visibility where the driver looks most frequently while conserving energy in less critical areas.
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting the luminance parameters of the backlight based on driving conditions, time of day, and detected driver attention patterns. The system varies brightness levels, color temperature, and luminance distribution patterns to achieve optimal visibility with minimal power consumption, rather than maintaining constant high luminance across the entire display.
2Illumination intensity
If the backlight luminance is increased to improve visibility, then the luminance of the display image is improved, but thermal issues and device size increase
Solution Approach 1:
The patent applies local quality by creating a non-uniform luminance distribution across the display surface. The center region has higher luminance to match the driver's focal attention area, while peripheral regions have reduced luminance. This is achieved through spatially selective backlight control, where different zones of the backlight unit are controlled independently to optimize visibility where the driver looks most frequently while conserving energy in less critical areas.
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting the luminance parameters of the backlight based on driving conditions, time of day, and detected driver attention patterns. The system varies brightness levels, color temperature, and luminance distribution patterns to achieve optimal visibility with minimal power consumption, rather than maintaining constant high luminance across the entire display.
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 enhances visibility by maintaining high luminance while preventing power consumption and thermal issues associated with increased backlight output, ensuring excellent rearward visual recognition without enlarging the device.
Implementation Method 1
The one-way mirror reflects incident light from a front surface side (a side exposed to a driver), and transmits incident light from a rear surface side (a liquid crystal display side).
Implementation Method 2
a liquid crystal display that includes a liquid crystal panel disposed on a rear surface side of the optical member
Implementation Method 3
a backlight that irradiates the liquid crystal panel with light, and displays an image of a rear view of a vehicle, wherein a peak angle of the backlight is directed downward with respect to a front direction of the liquid crystal panel
Data Source
AI summary
An electronic mirror device is attached to a vehicle interior and is used for rearward visual recognition. The electronic mirror device includes an optical member that reflects incident light from a front surface side and transmits incident light from a rear surface side, and an liquid crystal display that includes a liquid crystal panel disposed on the rear surface side of the optical member and a backlight that irradiates the liquid crystal panel with light, and displays an image of a rear view of the vehicle. A peak angle of the backlight is directed downward with respect to a front direction of the liquid crystal panel.