Multiview Display Aperture Mask for Driver Safety
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Solution Overview
Problem
Conventional displays with multiple viewing zones face challenges in reducing weight, cost, complexity, and aesthetic appeal, as well as limitations in shape and size, while also posing safety risks due to uniform illumination that can distract drivers with passenger content.
Innovation Solution
A multiview display utilizing an LCD panel with a backlight layer featuring distinct light sources and a layer of optical devices, such as an aperture mask or parallax barrier, to direct light selectively to each viewing zone, ensuring that images are visible only in their intended zones, thereby reducing cross-talk and allowing for asymmetric viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple independent displays are used for different viewing zones, then viewing functionality is improved, but weight, expense, and complexity increase
Solution Approach 1:
The patent combines multiple display functions into a single display device by integrating a layer of optical elements that directs light from a common backlight through the LCD panel to different viewing zones. This merging approach allows multiple viewing zones to share one display unit, reducing overall complexity while maintaining the ability to display different content for different observers.
Solution Approach 2:
The patent segments the backlight into multiple independent light sources, where each light source corresponds to a specific viewing zone. This segmentation allows selective illumination of different zones, enabling independent control of content displayed to each viewer while using a single integrated display structure.
2Ease of manufacture
If uniform illumination is used across the display, then manufacturing simplicity is maintained, but driver safety deteriorates due to distraction from passenger content
Solution Approach 1:
The patent applies local quality by providing different illumination characteristics to different regions of the display. The backlight includes multiple light sources with different intensities and characteristics tailored to specific viewing zones, allowing the driver zone to receive reduced illumination while the passenger zone receives full illumination, thus eliminating driver distraction while maintaining manufacturing feasibility.
3Weight of stationary object
If a single display is used for multiple viewing zones, then weight and cost are reduced, but cross-talk between zones increases
Solution Approach 1:
The patent introduces a layer of optical elements as an intermediary between the backlight and the LCD panel. This intermediary layer, positioned at a specific distance from the LCD panel, acts as a mediator that directs light from each backlight source to its corresponding viewing zone while blocking light from reaching other zones, thereby eliminating cross-talk while maintaining a single integrated display structure.
4Measurement precision
If multiple displays are used for different viewing zones, then image visibility is improved, but aesthetic appeal and space utilization worsen
Solution Approach 1:
The patent merges multiple display functions into a single aesthetic unit by integrating the optical element layer with the LCD panel and backlight assembly. This creates one cohesive display structure that maintains visual appeal while providing distinct viewing zones, avoiding the aesthetic degradation that would result from installing multiple separate display units.
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 the display of distinct images in multiple viewing zones with reduced brightness and illumination for the driver, enhancing safety and user experience by minimizing distractions and optimizing light distribution, while maintaining a compact and aesthetically pleasing design.
Implementation Method 1
a layer of optical devices arranged between said backlight and said LCD panel, said layer of optical devices comprising an aperture mask or a parallax barrier for blocking light from said first light source to reach said second viewing zone and blocking light from said second light source to reach said first viewing zone
Implementation Method 2
a layer of optical devices arranged between said backlight and said LCD panel, said layer of optical devices directing more light from said first light source to said first viewing zone than to said second viewing zone
Data Source
AI summary
A multiview display including a LCD panel for generating first and second images, a backlight including first and second light sources, the first light source illuminating the LCD panel the first image is generated and the second light source illuminating the LCD panel when the second image is generated, optical devices between the backlight and the LCD panel and including: an aperture mask comprising a plurality of apertures, the aperture mask blocking light from the light sources from reaching opposite viewing zones, and a lenticular sheet positioned adjacent to the aperture mask, first and second diffusers disposed between the backlight and the optical devices, and arranged for diffusing light horizontally and vertically, where a longitudinal axis of each aperture has an angle of 5 to 30 degrees.