Autostereoscopic Display Viewing Zone Expansion via Sub-Frame Control
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Solution Overview
Problem
Existing autostereoscopic 3D display apparatuses face a trade-off between image quality and viewing zone guidance, where improving one aspect typically compromises the other, failing to achieve simultaneous enhancement of both.
Innovation Solution
An autostereoscopic multi-view image display apparatus that includes a directional backlight unit, a viewing zone separator, and a controller to divide multi-view images into sub-frames and control light directions, allowing for sequential display of different viewpoint images to expand the viewing zone without degrading image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the viewing zone is increased in autostereoscopic 3D display apparatuses, then the guidance of the viewer is improved, but the image quality is reduced
Solution Approach 1:
The patent divides the multi-view image frame into multiple sub-frames, where each sub-frame corresponds to a specific viewing zone. This segmentation allows different portions of the image to be optimized for different viewing angles, enabling the overall viewing zone to be expanded while maintaining image quality within each segmented sub-frame.
Solution Approach 2:
The patent employs a directional backlight unit that can dynamically change the direction of light provision according to the displayed sub-frame. The backlight unit alternates between different light directions (e.g., first direction for first sub-frame, second direction for second sub-frame) to match the viewing zone requirements of each sub-frame, thereby expanding the effective viewing zone while maintaining image quality.
2Adaptability or versatility
If the viewing zone is increased to improve viewer guidance, then more viewers can view the 3D image, but the image quality degrades due to light distribution
Solution Approach 1:
The directional backlight unit dynamically adjusts its light direction based on which sub-frame is being displayed. When the first sub-frame is displayed, light is provided in the first direction; when the second sub-frame is displayed, light is provided in the second direction. This dynamic adaptation ensures optimal image quality for each viewing zone while collectively expanding the overall viewing zone coverage.
Solution Approach 2:
The patent uses periodic alternation between different sub-frames and corresponding light directions. The multi-view image frame is divided into sub-frames that are displayed in sequence, with the backlight unit periodically switching between different light directions to match each sub-frame's viewing zone requirements, thereby maintaining image quality across multiple viewing zones.
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 effectively increases the viewing zone while maintaining image quality by controlling light directions and dividing multi-view images into sub-frames, providing a wider viewing angle without compromising image clarity.
Implementation Method 1
a viewing zone separator disposed in front of the image panel and configured to provide different viewpoints according to viewing zones; The viewing zone separator may be a lenticular lens
Implementation Method 2
a backlight unit configured to provide light to the image panel; control lights of different directions to be provided to the image panel at points of time when the at least two sub-frames are displayed, respectively
Data Source
AI summary
An autostereoscopic multi-view image display apparatus includes an image panel including pixels arranged in rows and columns, a backlight unit configured to provide light to the image panel, and a viewing zone separator disposed in front of the image panel and configured to provide different viewpoints according to viewing zones. A processor is configured to control multi-view images included into one image frame to be divided into two groups, and to control two sub-frames including multi-view images included in the divided groups to be sequentially displayed. The lights of different directions are provided to the image panel at points of time when the two sub-frames are displayed, respectively.