Autostereoscopic Display with Steerable Backlight for Multi-User 3D
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Solution Overview
Problem
Conventional autostereoscopic displays face challenges in providing a stereoscopic viewing experience for multiple users due to reduced 3D mode spatial resolution and the loss of stereoscopic effect at transition edges between viewing cones, with existing solutions either reducing spatial resolution or being limited to single-user applications.
Innovation Solution
An autostereoscopic display system featuring a steerable backlight with a lenticular lens array, head/eye tracking, and a controller that provides views to two eyes of each tracked viewer simultaneously or time-sequentially, allowing for multi-user support and eliminating dead zones by adjusting the number and direction of views based on viewer position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a lenticular lens array is used to provide multiple viewing directions, then multi-user capability is improved, but spatial resolution is reduced
Solution Approach 1:
The patent implements dynamic view assignment where the controller adjusts which views are provided to which users based on real-time eye tracking data. This dynamic adaptation allows the system to optimize spatial resolution for each user's specific viewing position while maintaining multi-user capability, resolving the contradiction between versatility and resolution.
Solution Approach 2:
The display is segmented into multiple viewing zones with dedicated views for different users. The lenticular lens array divides the light output into distinct directional beams, each corresponding to a specific user position. This segmentation allows each user to receive optimized high-resolution imagery tailored to their location, maintaining both multi-user support and spatial resolution.
2Adaptability or versatility
If views are provided to multiple users simultaneously, then multi-user support is improved, but image processing complexity increases
Solution Approach 1:
The system uses time-sequential view switching combined with eye tracking to serve multiple users. Rather than processing all user views simultaneously, the controller alternates between providing views to different users in rapid succession, synchronized with their eye movements. This periodic action reduces image processing complexity while maintaining multi-user support.
Solution Approach 2:
The eye tracking system automatically identifies user positions and the controller autonomously assigns appropriate views without requiring manual input or complex real-time optimization algorithms. This self-service approach simplifies the image processing burden while enabling multi-user capability.
3Adaptability or versatility
If the number of views is increased to cover more viewing angles, then viewing coverage is improved, but spatial resolution decreases
Solution Approach 1:
The system dynamically adjusts the number and angular distribution of views based on detected user positions via eye tracking. When few users are present, fewer high-resolution views are generated. When multiple users at different angles are detected, the system increases viewing coverage by assigning additional views to appropriate users, maintaining high resolution for each user while expanding overall coverage as needed.
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 achieves high-resolution, multi-user capable autostereoscopic displays with reduced image processing requirements and minimal crosstalk, ensuring an optimal 3D experience by dynamically adjusting views for each user's position and perspective.
Implementation Method 1
a lenticular lens array, each lens of which is focused near a corresponding line of light output
Implementation Method 2
a second lenticular array for generating at least two views to different viewing directions
Data Source
AI summary
An autostereoscopic display includes a steerable display backlight, having a light output arrangement for providing lines of light output and a first lenticular lens array, with each lens focused near a corresponding line of light output. A display panel is illuminated by the backlight and a second lenticular array generates at least two views to different viewing directions. Head and/or eye tracking is used for tracking at least two viewers. Views are provided to the two eyes of a tracked viewer at the same time, and views are provided to the two eyes of different tracked viewers time-sequentially.