Light Field Display With Controllable Light-Steering Layers
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Solution Overview
Problem
Current 3D display technologies face challenges such as low resolution, large size, and high manufacturing costs in volumetric displays, and limitations in creating detailed spatial light modulators for holographic displays, while light field displays struggle with coarse stepwise view changes affecting the quality of the 3D experience due to diffraction and limited angular density.
Innovation Solution
A light-emitting layer with an addressable array of elements and a periodic optical layer, combined with controllable light-steering layers, enables precise direction of light to create high-resolution 3D images by focusing light onto specific voxel positions, overcoming the vergence-accommodation conflict and achieving smooth transitions between views.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If volumetric display techniques are used to produce 3D images in true 3D space, then correct retinal focus cues are provided, but the displays suffer from low resolution, large physical size, and expensive manufacturing costs
Solution Approach 1:
The display system segments the 3D image into multiple focal planes, with each plane containing discrete light-emitting elements arranged in specific patterns. This segmentation allows precise control over light emission at different depths while maintaining compact form factor and high resolution, overcoming the limitations of traditional volumetric displays
Solution Approach 2:
The invention transitions from traditional volumetric 3D space to a multi-planar arrangement where light-emitting elements are positioned at different focal planes along the optical axis. This dimensional reorganization enables high-resolution 3D imaging with correct focus cues while reducing physical footprint and manufacturing complexity
2Reliability
If light field displays use multiple views per single eye to create parallax, then correct retinal blur is produced, but coarse stepwise view changes reduce the quality of the 3D experience
Solution Approach 1:
The display system dynamically controls the activation of light-emitting elements across multiple focal planes in real-time. By selectively activating elements at different planes and positions, the system generates smooth continuous view transitions rather than coarse stepwise changes, while maintaining correct retinal blur and parallax effects
Solution Approach 2:
The display employs periodic scanning or activation patterns across the multiple focal planes, systematically cycling through different view angles and focal depths. This periodic action enables smooth interpolation between views and maintains continuous 3D visual experience without abrupt transitions
3Reliability
If holographic displays reconstruct whole light wavefronts, then natural retinal focus cues are achieved, but suitable Spatial Light Modulator components are lacking
Solution Approach 1:
The invention introduces an intermediary optical system comprising multiple focal planes with light-emitting elements and corresponding optical elements (lenses or diffractive structures). This intermediary structure mediates between simple light emission and complex wavefront reconstruction, achieving natural retinal focus cues through controlled light focusing at different planes without requiring complex SLM components
Solution Approach 2:
The invention replaces the need for complex mechanical or electro-optical Spatial Light Modulators with a simpler multi-planar light emission system. By using discrete light-emitting elements at different focal planes with corresponding optical focusing elements, the system achieves wavefront-like control through geometric and optical means rather than requiring sophisticated SLM technology
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 high-resolution, compact, and cost-effective 3D light field displays that provide natural retinal focus cues and improved motion parallax effects, enhancing the 3D experience by overcoming the limitations of existing technologies.
Implementation Method 1
A light-emitting layer with an addressable array of elements and a periodic optical layer, combined with controllable light-steering layers, enables precise direction of light to create high-resolution 3D images by focusing light onto specific voxel positions
Implementation Method 2
A first controllable light-steering layer is disposed between the light-emitting layer and the periodic optical layer. The first controllable light-steering layer is switchable between directing light from the first light-emitting element through the first periodic optical feature and directing light from the first light-emitting element through the second periodic optical feature
Data Source
AI summary
A light-emitting layer of an apparatus includes an addressable array of light-emitting elements including a first light-emitting element and a periodic optical layer overlaying the light-emitting layer. The periodic optical layer includes at least a first periodic optical feature having a first optical power and a second periodic optical feature having a different optical power. A first controllable light-steering layer is disposed between the light-emitting layer and the periodic optical layer. The first controllable light-steering layer is switchable between directing light from the first light-emitting element through the first periodic optical feature and directing light from the first light-emitting element through the second periodic optical feature.