Metasurface Beam Shaping for Thin Naked-Eye 3D Displays
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Solution Overview
Problem
Existing three-dimensional display technologies, particularly naked-eye types, face challenges with thickness and portability due to the use of heavy collimation backlight structures, leading to issues like visual fatigue and reduced comfort, and suffer from crosstalk and limited design freedom in forming three-dimensional effects.
Innovation Solution
A three-dimensional display device incorporating a stop unit and a collimation and refraction unit, where the refraction unit is a metasurface, to limit and refract light beams, allowing for a lighter, thinner design with improved control over refraction directions and reduced crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a collimation backlight structure is used in naked-eye three-dimensional display technology, then light field control and three-dimensional effect are achieved, but the device becomes heavy and thick, reducing portability and comfort
Solution Approach 1:
The patent extracts the collimation function from a separate backlight unit and integrates it directly into the display panel structure. The collimation layer is positioned adjacent to the light-emitting elements, eliminating the need for a dedicated collimation backlight module and thereby reducing overall device weight while maintaining light field control capabilities
Solution Approach 2:
The patent merges the collimation function with the display panel structure by integrating a collimation layer directly into the panel. This combination of the display function and collimation function into a single integrated structure reduces the number of separate components, thereby decreasing device weight and thickness while preserving three-dimensional display performance
2Reliability
If a collimation backlight structure is used in naked-eye three-dimensional display technology, then light field adjustment is achieved, but the device thickness increases, affecting portability
Solution Approach 1:
The patent extracts the collimation function from a separate backlight unit and integrates it directly into the display panel structure. The collimation layer is positioned adjacent to the light-emitting elements, eliminating the need for a dedicated collimation backlight module and thereby reducing overall device thickness while maintaining light field control capabilities
Solution Approach 2:
The patent merges the collimation function with the display panel structure by integrating a collimation layer directly into the panel. This combination of the display function and collimation function into a single integrated structure reduces the number of separate components, thereby decreasing device thickness while preserving three-dimensional display performance
3Reliability
If conventional refraction structures are used, then three-dimensional effect is formed, but crosstalk between viewpoints occurs and design freedom is limited
Solution Approach 1:
The patent applies local quality by using metasurfaces with spatially varying phase profiles that are specifically designed for each pixel or pixel group. Each metasurface region has customized refraction characteristics tailored to its local position and function, enabling precise control of light direction for different viewpoints while minimizing crosstalk between adjacent view areas
Solution Approach 2:
The patent employs metasurfaces that can dynamically adjust refraction parameters such as phase delay and orientation. By changing these optical parameters across different regions of the metasurface, the system can precisely control light propagation directions for multiple viewpoints, reducing viewpoint crosstalk and enhancing three-dimensional display quality
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 combination of a stop unit and metasurface-based collimation and refraction unit enhances the three-dimensional display effect by reducing thickness, improving portability, minimizing crosstalk, and increasing design freedom, resulting in a high-quality naked-eye 3D experience.
Implementation Method 1
a stop unit array, including a plurality of stop units, where the plurality of stop units is in one-to-one correspondence with a plurality of sub-pixels in the plurality of pixel units, and is configured to limit a divergence angle of a light beam emitted from each sub-pixel
Implementation Method 2
a collimation and refraction array, including a plurality of collimation and refraction units, where the plurality of collimation and refraction units is in one-to-one correspondence with the plurality of stop units, and is configured to collimate and refract the light beam limited by the stop unit array
Implementation Method 3
each collimation and refraction unit is a metasurface, and the metasurface includes a plurality of micro-nano structural units formed on a substrate
Implementation Method 4
the metasurface is used, so that a refraction direction of a viewpoint can be adjusted and controlled more freely
Data Source
AI summary
A three-dimensional display device includes a light source, having a pixel unit array, where each pixel unit in the pixel unit array includes a plurality of sub-pixels; a stop unit array, including a plurality of stop units, where the plurality of stop units is in one-to-one correspondence with a plurality of sub-pixels in a plurality of pixel units and is configured to limit a divergence angle (γ) of a light beam emitted from each sub-pixel; and a collimation and refraction array, including a plurality of collimation and refraction units, where the plurality of collimation and refraction units is in one-to-one correspondence with the plurality of stop units and is configured to separately collimate and refract the light beam whose divergence angle (γ) is limited.