Transparent Display with Holographic Diffuser for Large Eyebox
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Solution Overview
Problem
Existing transparent displays are costly to produce, lack robustness for harsh environments, and have limited field of view and eyebox, especially in large formats.
Innovation Solution
A transparent display design incorporating a holographic diffuser and a projector with a reflection unit, where the image generating unit is opposite the diffuser plane, utilizing a holographic diffuser that scatters light in a targeted manner to create a large eyebox and field of view, and a method to produce large-format holographic diffusers by dividing them into tile portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional transparent displays are used, then the display can be transparent, but the production cost is very high and robustness for harsh environments is insufficient
Solution Approach 1:
The patent uses a holographic diffuser that creates optical copies of the image through light scattering, allowing the same image to be displayed across a large area without requiring proportionally larger expensive OLED panels. This copying approach reduces material costs while maintaining display quality and transparency.
Solution Approach 2:
The patent replaces conventional mechanical projection systems with a holographic diffuser-based system that uses light scattering and interference patterns to create images. This substitution reduces the need for complex mechanical components and reduces production costs while improving robustness.
2Area of stationary object
If head-up displays are used, then images can be projected onto transparent substrates, but the field of view and eyebox are limited
Solution Approach 1:
The patent transitions from two-dimensional image projection on a flat substrate to three-dimensional holographic display using a volumetric diffuser. This dimensional change allows light to be scattered in multiple directions simultaneously, creating a large field of view and extended eyebox without increasing the physical size of the display device.
Solution Approach 2:
The holographic diffuser is divided into multiple tile portions that can be independently manufactured and then assembled. This segmentation allows the creation of large-format displays by combining smaller units, effectively increasing the field of view while keeping individual components manageable and cost-effective.
3Area of stationary object
If large-format transparent displays are produced, then the display area increases, but the production cost increases significantly
Solution Approach 1:
The patent divides the large-format holographic diffuser into multiple tile portions that can be manufactured separately using standardized processes. This segmentation enables cost-effective production by allowing parallel manufacturing of smaller units that are then assembled into the complete large-format display, significantly reducing overall production costs compared to manufacturing a single large unit.
Solution Approach 2:
The holographic diffuser creates optical copies of the image across the entire display area through light scattering, allowing the same image data to be replicated across multiple tiles. This copying mechanism enables large-format displays without requiring proportionally larger and more expensive OLED panels for each tile.
4Area of stationary object
If conventional diffusers are used, then light scattering occurs, but the scattering is not targeted and does not create a large eyebox
Solution Approach 1:
The patent changes the parameters of light scattering by using a holographic diffuser with specific refractive index profiles and curvature radius. These parameter changes enable the diffuser to scatter light in targeted directions while maintaining a large eyebox, unlike conventional diffusers that scatter light uniformly in all directions.
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 design achieves a cost-effective, robust, and high-quality transparent display with a large field of view and eyebox, suitable for large formats, while maintaining a compact depth and high transparency.
Implementation Method 1
a holographic diffuser which extends substantially in a two-dimensional diffuser plane... which scatters incident light from one or more specific directions in a targeted manner
Implementation Method 2
a reflection unit, wherein the reflection unit is configured to reflect images generated by the image generating unit in the direction of the holographic diffuser
Data Source
AI summary
The invention relates to a transparent display comprising a holographic diffuser that extends substantially in a two-dimensional diffuser plane and comprising a projector, the projector having an image generation unit, in particular a digital micromirror device (DMD), and a reflection unit, wherein the reflection unit is configured to reflect, in the direction of the holographic diffuser, images generated by the image generation unit, and the image generation unit is arranged on a side of the diffuser plane lying opposite the reflection unit. The invention also relates to a method for producing a holographic diffuser.