Windshield Display Luminance Control for Real and Virtual Images
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Solution Overview
Problem
Conventional vehicle display devices cause visual discomfort and dazzling due to differences in luminance when switching between displays inside and outside the vehicle, as the display positions are viewed with different environmental lighting conditions.
Innovation Solution
A vehicle display device with a control unit that adjusts light intensity to maintain a predetermined luminance difference between real and virtual images, using a display unit and reflection unit to emit polarized light for both types of images, ensuring appropriate luminance levels based on environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display position is switched between inside and outside the vehicle, then the display can be viewed in different environmental conditions, but the luminance difference causes visual discomfort and dazzling
Solution Approach 1:
The patent applies dynamics by making the light intensity adjustable and changeable based on the display position. The control unit dynamically adjusts the light intensity of the light source according to whether the display is shown inside or outside the vehicle, enabling the system to adapt to different environmental conditions and eliminate visual discomfort caused by fixed luminance levels.
Solution Approach 2:
The patent changes the luminance parameter (light intensity) based on the display position. By adjusting the light intensity parameter when switching between inside and outside display positions, the system maintains appropriate luminance levels for each environment, preventing the harmful effect of luminance difference and visual discomfort.
2Illumination intensity
If the light intensity is increased for outside display, then the visibility improves in bright environmental light, but the display becomes too bright and dazzling when viewed inside the vehicle
Solution Approach 1:
The patent applies local quality by providing different luminance levels for different display positions. The control unit adjusts the light intensity specifically for outside display positions to ensure adequate visibility in bright environmental light, while maintaining lower luminance for inside vehicle display to avoid dazzling effects, thus optimizing the display quality for each specific location.
Solution Approach 2:
The system dynamically adjusts the light intensity based on the selected display position. When the display is switched to outside position, the light intensity is increased to overcome bright environmental light. When switched to inside position, the light intensity is reduced to prevent dazzling, making the luminance adaptive rather than fixed.
3Object-affected harmful factors
If the light intensity is decreased for inside display, then the comfort is improved in vehicle interior conditions, but the visibility is insufficient when viewed outside the vehicle
Solution Approach 1:
The patent implements local quality by optimizing the luminance level for each specific display position. For inside vehicle display, the light intensity is decreased to provide visual comfort in the vehicle interior environment. For outside display, the light intensity is increased to ensure adequate visibility against the external environment, thus maintaining information visibility while ensuring comfort for each location.
Solution Approach 2:
The system uses dynamic adjustment of light intensity to maintain both comfort and visibility. When the display position is set to inside, the lower light intensity provides comfort for interior viewing. When the position is set to outside, the higher light intensity ensures visibility in external conditions, making the system adaptable to different viewing environments without compromising either comfort or visibility.
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 device allows occupants to comfortably view both real and virtual images with reduced visual discomfort by controlling light intensity, preventing dazzling effects during transitions between display modes.
Implementation Method 1
a display unit 12 that includes a display element, the display unit 12 transmitting light emitted by a light source 11 and displaying the display image
Implementation Method 2
a reflection unit 13 that reflects light representing the display image displayed on the display unit 12 toward the translucent member WS
Data Source
AI summary
A vehicle display device, which emits display light from an opening toward a windshield and thereby allows a virtual image and a real image of a display image represented by the display light to be visually recognized, includes a display unit including a display element, transmitting light emitted by a light source, and displaying the display image, a reflection unit reflecting light representing the display image displayed on the display unit toward the windshield, and a control unit. The control unit executes light intensity control processing of controlling a light intensity of the light source in such a way that a real image display luminance setting when a real image is visually recognized and a virtual image display luminance setting when a virtual image is visually recognized have a predetermined luminance difference from each other.