Grating Compound Lens Deflects Light for Wide-Angle Display Imaging
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Solution Overview
Problem
Conventional display devices face challenges in achieving high-quality imaging with a wide view angle while maintaining a thin and lightweight design, as off-axis imaging results in significant aberration and poor imaging quality, and increasing the focal length to improve imaging quality increases the device thickness and complexity in fabrication.
Innovation Solution
The display device incorporates a grating compound lens unit that deflects light to intersect the image-space central visual field direction with the optical axis, allowing for paraxial imaging and reducing aberration, while also enabling a wider view angle and thinner design by arranging grating compound lens units to form multiple viewpoints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the focal length is increased to improve imaging quality, then imaging quality is improved, but device thickness and fabrication complexity increase
Solution Approach 1:
The lens is divided into multiple lens units, each with different optical powers. The first lens unit has positive optical power and the second lens unit has negative optical power. This segmentation allows the system to achieve high imaging quality with a shorter effective focal length, avoiding the need for a single long focal length lens that would increase device thickness and fabrication complexity.
2Adaptability or versatility
If off-axis imaging is used to achieve wide view angle, then view angle is increased, but imaging quality deteriorates due to significant aberration
Solution Approach 1:
The patent employs asymmetric optical design in the lens units, particularly in the arrangement and curvature of lens elements. The first and second lens units have different optical powers and are positioned asymmetrically relative to the optical axis. This asymmetric configuration enables the system to maintain high imaging quality across a wide field of view by compensating for off-axis aberrations without requiring symmetric off-axis imaging arrangements.
3Device complexity
If a single lens unit is used to simplify structure, then device complexity is reduced, but imaging quality and view angle are compromised
Solution Approach 1:
The lens is segmented into multiple lens units with distinct optical functions. The first lens unit provides positive optical power for focusing, while the second lens unit provides negative optical power for expanding the field of view and correcting aberrations. This segmentation achieves superior imaging quality and wide view angle while keeping each individual lens unit relatively simple in structure.
Solution Approach 2:
Each lens unit serves multiple functions: the first lens unit not only focuses light but also contributes to aberration correction, while the second lens unit both expands the field of view and corrects optical aberrations. This multi-functionality allows the system to achieve high performance without requiring additional corrective elements, thus avoiding excessive structural complexity.
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 solution enhances imaging quality, reduces the focal length, and increases the view angle of the display device, improving user experience while simplifying the fabrication and alignment of the display layer with the lens layer.
Implementation Method 1
the grating unit is configured to deflect the light for imaging, so that the image-space central visual field direction of the grating compound lens unit intersects with an extension direction of an optical axis of the lens unit
Implementation Method 2
the lens unit is configured to optically image the display pixel set
Data Source
AI summary
A display device is disclosed, and the display device includes a display layer and a lens layer; the lens layer is provided on a light emergent side of the display layer, and includes at least one grating compound lens unit; the display layer includes at least one display pixel set, and the display pixel set is configured to emit light for imaging toward the grating compound lens unit during display; the grating compound lens unit is configured to optically image the display pixel set; and the grating compound lens unit is further configured to deflect the light for imaging, to make an image-space central visual field direction of the grating compound lens unit intersect with an extension direction of an optical axis of the grating compound lens unit, so that the display device has one or more viewpoints.