Curved Lens Array for Uniform Naked-Eye 3D Display
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Solution Overview
Problem
Existing directional backlight stereoscopic display devices suffer from non-uniform screen luminance due to dark regions between viewing zones, affecting the visual experience by causing brightness variations when moving between left and right eye viewing zones.
Innovation Solution
A directional backlight stereoscopic display device with a lens array arranged as a concave surface of definite curvature, separated from the image display unit, ensures uninterrupted and uniform viewing zones by optimizing the spatial relationship between backlight and lens units, and includes a viewpoint detecting module to adjust light emission accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple backlight units are arranged to provide illumination for different viewing zone units, then the viewing zones can be formed, but dark regions appear between the viewing zones causing non-uniform screen luminance
Solution Approach 1:
The patent extracts and eliminates the harmful dark regions between viewing zones by introducing a light-guiding plate that redirects light from adjacent backlight units to illuminate these dark regions, thereby removing the non-uniformity problem while maintaining the multi-viewing-zone structure
Solution Approach 2:
A light-guiding plate is introduced as an intermediary component between the backlight units and the viewing zones. This light-guiding plate redirects light from adjacent backlight units into the dark regions between viewing zones, serving as a mediator to eliminate luminance non-uniformity without disrupting the original viewing zone formation
2Volume of moving object
If the lens array is positioned close to the image display unit, then the device structure is compact, but dark regions appear at the edges of viewing zone units
Solution Approach 1:
The patent introduces a new spatial dimension by adding the light-guiding plate between the backlight units and the viewing zones. This additional optical path in a different dimension allows light to reach dark regions without increasing the overall device volume, thus maintaining compactness while improving uniformity
3Ease of manufacture
If the lens array is arranged as a flat surface, then the manufacturing is simpler, but the viewing angle is limited and dark regions appear between viewing zones
Solution Approach 1:
The patent applies curvature to the lens array, arranging lens units along a curved surface rather than a flat plane. This curved configuration expands the viewing angle and eliminates dark regions between viewing zones while maintaining manufacturing feasibility through standard curved lens fabrication techniques
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
This configuration eliminates dark regions, enhances the viewing angle to ±15 degrees, and provides a uniform naked-eye 3D image experience while moving, with increased processing feasibility and reduced product costs.
Implementation Method 1
Light rays emitted from the light source sequentially passes through the lens array and the transmissive image display unit, and then are converged in a particular viewing zone
Data Source
AI summary
A direction backlight stereoscopic display device, comprises a backlight assembly, and sequentially comprises a lens array and an image display unit along a transmitting direction of light rays emitted from the backlight assembly. The lens array includes a plurality of lens units, and the lens units are arranged along a preset curvature, forming a concave surface facing toward the image display unit. The lens array of the directional backlight stereoscopic display device according to the embodiments of the present invention is arranged as a concave surface with a definite curvature, forming an uninterrupted viewing zone distribution in a viewing region to guarantee the viewing zone a visual effect of uniformity without any dark region.