3D Display Grating Structures Resolve Focusing-Converging Mismatch
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Solution Overview
Problem
Current three-dimensional display devices cause inconsistent focusing positions between a single eye and the converging positions of double eyes, leading to a dizzying effect for viewers due to parallax differences.
Innovation Solution
A three-dimensional display device incorporating sub-pixels and corresponding grating structures that direct light to converge into specific viewpoints for both eyes, ensuring consistent focusing and converging positions by using waveguide portions and collimation light sources, with grating structures designed to meet specific optical parameters for optimal light convergence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional 3D display technology is used to create stereoscopic images, then the converging position of double eyes can be adjusted, but the focusing position of one single eye remains fixed at the screen, causing inconsistency between focusing and converging positions
Solution Approach 1:
The patent divides the backlight into multiple independent light sources corresponding to different depth positions. Each light source emits light that converges at a specific depth, allowing the system to segment the 3D space into multiple focal planes. This segmentation enables both focusing and converging positions to be adjusted to the same depth, resolving the inconsistency between single-eye focusing and double-eye converging.
Solution Approach 2:
The patent changes the optical parameters of the backlight system by using light sources with different emission angles and positions. By adjusting parameters such as the emission angle θ and position coordinates (x, y) of each light source, the system can control where light converges in 3D space. This parameter adjustment allows the focusing position (determined by lens optics) to match the converging position (determined by light source geometry).
2Measurement precision
If grating structures are added to each sub pixel to control light direction, then light convergence at specific viewpoints is achieved, but the device complexity increases
Solution Approach 1:
The patent makes the backlight module serve multiple functions: it provides both the illumination function and the 3D light convergence function. By integrating the 3D control functionality into the existing backlight module rather than adding separate components, the system achieves precise light convergence without proportionally increasing overall device complexity. The backlight module becomes a multi-functional component that handles both lighting and stereoscopic image generation.
Solution Approach 2:
The patent introduces a grating structure as an intermediary element between the light source and the display panel. This grating structure modulates the light from each backlight source to achieve precise convergence at specific viewpoints. By using this intermediary optical element, the system achieves high measurement precision for light convergence while keeping the overall device architecture relatively simple, as the grating can be integrated into existing display layers.
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 enables single-eye focusing three-dimensional displays, ensuring consistent focusing positions for both eyes, thereby eliminating dizzying effects and enhancing image quality and field depth in VR/AR applications.
Implementation Method 1
each grating structure is configured to enable light to emerge according to an assigned direction, so that emergent light of the three-dimensional display device is converged into at least two viewpoints at a left eye of an observer and converged into at least two viewpoints at a right eye of the observer
Implementation Method 2
at least one waveguide portion arranged in a laminating mode and a collimation light source located at a position of a light incident surface of each waveguide portion
Data Source
AI summary
A three-dimensional display device includes: a plurality of sub pixels and a plurality of grating structures in a one-to-one correspondence with the plurality of sub pixels; each grating structure is configured to enable light to emerge according to an assigned direction, so that emergent light of the three-dimensional display device is converged into at least two viewpoints at a left eye of an observer and converged into at least two viewpoints at a right eye of the observer.