Multibeam Diffraction Grating for Glasses-Free 3D Display
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Solution Overview
Problem
Passive electronic displays, which do not emit light, face limitations in practical applications due to their inability to emit light, often requiring an external light source for functionality, which can restrict their use in various applications.
Innovation Solution
A 3D electronic display system utilizing a grating-based backlight with multibeam diffraction gratings that couples light into a light guide, producing differently directed light beams, allowing for the creation of a composite image that spatially interleaves pixels from multiple 3D views, enabling 'glasses-free' 3D image rendering without the need for external light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If passive displays are coupled to an external light source, then light emission capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the light source and light guide functions into a single integrated backlight unit that is coupled to the display panel. This integration combines multiple components (light source, collimator, light guide, diffraction grating) into one unified structure, achieving light emission capability while managing device complexity through systematic integration rather than separate components.
Solution Approach 2:
The backlight unit serves multiple functions simultaneously: it provides illumination, guides light through the display panel, and enables 3D image display through diffraction gratings. This multi-functionality reduces the need for separate components, improving light emission capability without proportionally increasing device complexity.
2Adaptability or versatility
If a grating-based backlight with multibeam diffraction gratings is used, then 3D image rendering capability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The diffraction grating is divided into multiple independent gratings, each producing a specific light beam at a predetermined angle. This segmentation allows each grating to be optimized for its specific function, improving 3D image rendering capability while enabling modular manufacturing that can reduce overall precision requirements compared to a single complex grating system.
Solution Approach 2:
The patent varies parameters such as the pitch and orientation of diffraction gratings to control light beam directions. By changing these parameters systematically, the system achieves versatile 3D image rendering capability while using standardized manufacturing processes that can maintain precision within achievable limits.
3Illumination intensity
If color filters are used to transform white light into various colors, then color display capability is improved, but light transmission efficiency decreases
Solution Approach 1:
The collimator pre-processes light from the light source before it reaches the display panel, organizing light rays into parallel beams. This preliminary action optimizes light distribution early in the optical path, improving overall light transmission efficiency and reducing energy loss that would otherwise occur through unoptimized light propagation through the display stack.
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 the efficient display of 3D information by modulating light beams with different principal angular directions, facilitating the distribution of 3D pixels across the display, thus enhancing the capability of 3D electronic displays to render 3D images without the need for external illumination, improving their applicability and user experience.
Implementation Method 1
a multibeam diffraction grating configured to diffractively couple out the guided, collimated light as a plurality of light beams, each of the plurality of light beams having a different principal angular direction
Data Source
AI summary
A three-dimensional (3D) display driver includes a single buffer and a mapping circuit. The single buffer is configured to store a tiled image that includes a contiguously arranged plurality of tiles. Each tile represents a different 3D view of a 3D image. The different 3D views have associated angular ranges and principal angular directions. The mapping circuit is configured to access the stored tiled image and to map pixels from the different 3D views into pixels at corresponding locations in a composite image. The composite image is configured to spatially interleave the pixels from the different 3D views so that pixels from each of the different 3D views are distributed across the composite image. A 3D electronic display includes the mapping circuit.