Directional Pixel Grating for Light Field Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current display screens, including 3D technologies, fail to accurately reproduce a light field due to inefficiencies in angular and spatial resolution and difficulty in fabricating displays with precise light field control at the pixel level for wide viewing angles and resolutions.
Innovation Solution
The directional pixel design, featuring a patterned grating of parallel and slanted grooves on a light propagating layer, scatters a controlled fraction of input planar light into a directional lightbeam, allowing precise control of light direction and angular spread through grating length, width, orientation, and pitch, ensuring only one directional lightbeam emerges regardless of output angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional 3D display technologies (holographic gratings, parallax barriers, lenticular lenses) are used, then three-dimensional viewing effect is achieved, but angular and spatial resolution are insufficient and the number of views is limited
Solution Approach 1:
The display is divided into individual directional pixels, each containing a grating structure that independently controls light direction. This segmentation allows precise control of light rays at the pixel level, enabling high angular resolution while maintaining wide viewing angles through coordinated operation of multiple segmented elements.
Solution Approach 2:
Each directional pixel is designed with specific grating parameters (groove orientation, pitch, depth) tailored to control light in particular directions. This local customization of optical properties enables precise control of angular distribution for each pixel, achieving high angular resolution while collectively providing wide viewing coverage.
2Adaptability or versatility
If light field control is implemented at the pixel level for wide viewing angles, then image quality across multiple views is improved, but manufacturing precision requirements increase significantly
Solution Approach 1:
The patent replaces complex mechanical alignment systems with a planar grating structure where light direction is controlled through fixed geometric parameters (groove orientation, pitch). This substitution of mechanical control with geometric optics simplifies the manufacturing process and reduces the need for high-precision mechanical assembly while maintaining precise light field control.
Solution Approach 2:
The invention controls light direction by adjusting grating parameters (groove pitch, orientation, depth) rather than requiring precise mechanical positioning. These parameter changes can be implemented through standard semiconductor fabrication techniques, significantly reducing manufacturing precision requirements compared to mechanical alignment approaches.
3Measurement precision
If directional gratings are used to control light output angle, then angular resolution is improved, but device complexity increases due to additional structural elements
Solution Approach 1:
The directional control function is merged into the pixel structure itself through integrated grating patterns, eliminating the need for separate mechanical steering components. This merging of light direction control directly into the pixel architecture achieves high angular resolution without proportionally increasing overall device complexity.
Solution Approach 2:
The patent uses replicated grating patterns across the display array, where each directional pixel contains a copy of the grating structure with appropriate parameter adjustments. This copying approach standardizes the complex optical control function across all pixels, making the system more manageable despite the complexity of individual pixel structures.
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 enables precise light direction and angular control, allowing for the creation of multi-view display screens that emulate a light field, providing accurate image quality across a wide range of viewing angles and spatial resolutions, and can be used in privacy displays for secure viewing.
Implementation Method 1
The directional pixel has a patterned grating of substantially parallel and slanted grooves arranged in or on top of a light propagating layer... scatters a small, controlled fraction of the input planar lightbeam into an output directional lightbeam
Data Source
AI summary
A directional pixel for use in a display screen is disclosed. The directional pixel receives a planar lightbeam and includes a light propagating layer and a grating to scatter a portion of the planar lightbeam into a directional lightbeam having a direction and angular spread controlled by the grating.