Directional Backlight Modulation for 3D Light Field Reproduction
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Solution Overview
Problem
Current display screens, including TVs, personal computers, and mobile devices, are unable to accurately reproduce a light field due to their two-dimensional nature, and existing 3D displays face inefficiencies in angular and spatial resolution, struggling to generate light fields with precision at the pixel level for wide viewing angles and spatial resolutions.
Innovation Solution
A directional backlight with a modulation layer and patterned gratings in directional pixels that scatter input planar lightbeams into directional lightbeams, allowing for precise control of light direction and angular spread, enabling the generation of 3D images with multiple views through modulators like LCD cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional 2D display screens are used, then manufacturing simplicity is maintained, but light field reproduction capability is lost
Solution Approach 1:
The display is segmented into multiple directional pixels, each capable of independently controlling light direction. This segmentation enables the system to reproduce light fields by manipulating individual light rays, transforming a traditional 2D display into a 3D light field display capable of multiple viewing angles and spatial resolutions.
Solution Approach 2:
The invention transitions from 2D display to 3D light field display by adding angular and spatial dimensions. Directional pixels control light rays in three-dimensional space, enabling viewers to experience depth and perspective as in real-world scenes, thereby achieving light field reproduction.
2Measurement precision
If existing 3D displays based on holograms, parallax barriers, or lenticular lenses are used, then 3D imaging capability is achieved, but angular and spatial resolution efficiency deteriorates
Solution Approach 1:
The invention replaces mechanical optical systems (holograms, parallax barriers, lenticular lenses) with electronically controllable directional pixels. Each directional pixel can be independently modulated to control light direction and intensity, enabling precise angular and spatial resolution control through electronic means rather than fixed optical structures.
3Manufacturing precision
If directional pixels with patterned gratings are implemented, then light direction control precision is improved, but device complexity increases
Solution Approach 1:
The invention controls light direction by changing parameters of directional pixels, including grating orientation, pitch, and depth. By adjusting these parameters, each pixel can precisely control the direction of scattered light beams, enabling accurate light field reproduction while maintaining a relatively simple pixel structure based on conventional grating techniques.
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 allows for the precise control of directional lightbeams, enabling the creation of 3D images with improved angular and spatial resolution, providing a more immersive viewing experience by accurately replicating light fields across various viewing angles and spatial positions.
Implementation Method 1
Each directional pixel scatters a fraction of the input planar lightbeams into an output directional lightbeam
Implementation Method 2
The modulators may be, for example, Liquid Crystal Display ('LCD') cells (with or without polarizers). Other types of modulators may be used, such as those based on a different mechanism including micro-electrical-mechanical ('MEMS'), fluidic, magnetic, electrophoretic, or other mechanism that modulates the intensity of light upon application of an electrical signal
Data Source
AI summary
A directional backlight has a directional backplane that has a plurality of directional pixels configured to scatter a plurality of input planar lightbeams into a plurality of directional lightbeams. Each directional lightbeam has a direction and angular spread controlled by characteristics of a directional pixel in the plurality of directional pixels. A modulation layer having a plurality of modulators configured to modulate the plurality of directional lightbeams. The directional backlight is configured to generate a 3D image with multiple views by specifying the characteristics of the directional pixels in the directional backplane.