Multiview Display with User Tracking and Multibeam Backlight
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Solution Overview
Problem
Passive displays, such as LCDs and EP displays, lack the ability to emit light, limiting their practical applications, and often require external light sources like backlights to function as active displays, which can lead to issues like reduced angular field-of-view and 'jumps' or 'inverted views' when viewed at oblique angles.
Innovation Solution
A multiview display system that employs a multibeam backlight and a light valve array to provide different sets of views based on user location, using a combination of periodic user location measurement and relative motion to adjust the display, offering an increased angular field-of-view and mitigating perception issues by incorporating a secondary view beyond the primary view set.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If passive displays are coupled to an external light source to function as active displays, then the displays can emit light and improve brightness, but the angular field-of-view is reduced and perception issues occur at oblique angles
Solution Approach 1:
The backlight is segmented into multiple independent light beams, each directed at specific angles toward the display panel. This segmentation allows different angular regions to receive light optimized for their viewing direction, thereby expanding the overall angular field-of-view while maintaining brightness performance.
Solution Approach 2:
Different regions of the display receive light with different angular characteristics tailored to their specific viewing zones. The multibeam backlight system provides locally optimized illumination quality for each angular sector, ensuring consistent image quality and preventing perception issues like jumps or inverted views at oblique angles.
2Adaptability or versatility
If a multibeam backlight is used to increase angular field-of-view, then more views are available, but the device complexity increases
Solution Approach 1:
The multibeam backlight structure employs a nested arrangement where multiple light beams are integrated within a compact backlight assembly. This nesting approach allows the system to provide multiple angular views without proportionally increasing the overall device footprint or structural complexity.
Solution Approach 2:
The patent transitions from a conventional single-direction backlight to a multibeam system that utilizes angular dimensionality. By distributing light across multiple angular dimensions rather than a single plane, the system achieves expanded viewing capabilities while maintaining a relatively simple planar structure.
3Ease of operation
If user tracking is implemented to dynamically adjust views, then user experience is improved, but measurement and control complexity increases
Solution Approach 1:
The display system incorporates user tracking with feedback mechanisms that monitor user position and dynamically adjust the active view set. This feedback loop enables the system to automatically optimize the displayed content based on real-time user location, enhancing user experience while managing measurement complexity through systematic control algorithms.
Solution Approach 2:
The view set configuration is made dynamic rather than static, allowing the system to adaptively switch between different view configurations based on detected user position. This dynamic adjustment capability improves ease of operation by automatically presenting the most appropriate view without requiring manual user intervention.
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 enhances the angular field-of-view and reduces perception issues like 'jumps' or 'inverted views' by dynamically adjusting the view set based on user position, effectively transforming passive displays into more versatile and user-friendly active displays.
Implementation Method 1
a multibeam backlight configured to provide a plurality of emitted or scattered-out light beams having different principal angular directions corresponding to the different view directions of the plurality of views
Implementation Method 2
a light valve array configured to modulate the plurality of scattered-out light beams to provide the plurality of views
Implementation Method 3
a diffraction grating configured to scatter out of the light guide a portion of the guided light as a plurality of directional light beams having different principal angular directions
Data Source
AI summary
A user-tracking multiview display and a user-tracking multiview display system selectively provide a primary set of views and a secondary view according to a location of a user determined by a both a relative motion of the user-tracking multiview display and a periodic user location measurement. The user-tracking multiview display includes a multibeam backlight configured to provide directional light beams corresponding to different view directions of a multiview image and a light valve array configured to modulate the directional light beams to provide a plurality of views including the primary view set and the secondary view. The user-tracking multiview display system further includes a user tracker configured to determine a position of a user using both a periodic user location measurement and relative motion of the user-tracking multiview display system.