HUD Replicator Expanding Eye Box via Hologram Duplication
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Solution Overview
Problem
Traditional head-up display (HUD) systems in vehicles have a limited eye box/exit pupil size due to the lack of hologram replication, which restricts the driver's field of view and can lead to discontinuity of virtual images when the eyes move.
Innovation Solution
A HUD system that includes a replicator configured to generate and output multiple identical holograms, with a transmissive element providing different transmittances at various locations and a reflective element ensuring 100% reflectivity, increasing the eye box size by replicating the hologram in multiple directions without overlap, allowing for a larger viewing area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a traditional HUD system displays information through a single hologram, then the system structure is simple, but the eye box/exit pupil size is limited
Solution Approach 1:
The patent applies the copying principle by using a replicator to generate multiple copies (N replications) of the single input hologram. Each replication is transmitted through the transparent element with different transmittance values, creating multiple virtual images that expand the eye box size. This allows the system to maintain a relatively simple overall structure while achieving a larger viewing area through hologram replication.
Solution Approach 2:
The patent implements local quality by assigning different transmittance values to different regions of the transparent element. Each region corresponds to a specific hologram replication and has a tailored transmittance value to optimize the intensity and visibility of each virtual image. This localized control of optical properties enables precise management of multiple holographic outputs while maintaining system simplicity.
2Ease of operation
If the driver moves their eyes to expand the field of view, then more information can be seen, but the virtual images become discontinuous
Solution Approach 1:
The patent applies segmentation by dividing the single hologram into multiple replications that are spatially distributed across different regions of the transparent element. Each replication serves as a separate viewing zone that maintains image continuity as the driver's eyes move across the field of view. This segmented approach ensures that at least one continuous virtual image remains visible regardless of eye position.
Solution Approach 2:
The patent utilizes another dimension by arranging multiple hologram replications in different spatial locations and orientations on the transparent element. This multi-dimensional distribution of virtual images provides continuous visual coverage across a broader field of view, maintaining image stability as the driver's eyes move in various directions.
3Area of stationary object
If multiple holograms are displayed simultaneously, then the eye box size increases, but the light intensity is distributed and each hologram appears dimmer
Solution Approach 1:
The patent implements local quality by assigning different transmittance values to different regions of the transparent element corresponding to each hologram replication. Regions with higher transmittance allow more light to pass through, compensating for the distributed light intensity and ensuring each virtual image maintains adequate brightness. This localized optimization enables multiple holograms to be displayed simultaneously with improved viewing area while maintaining acceptable intensity levels.
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 solution significantly enlarges the eye box/exit pupil size of the HUD system, ensuring continuous virtual images even when the viewer's eyes move, by replicating holograms in multiple directions without overlap, thereby enhancing the driver's field of view and maintaining image continuity.
Implementation Method 1
a reflective element configured to reflect light toward the transmissive element
Implementation Method 2
a transmissive element configured to receive the hologram and to output the N replications of the hologram, where N is an integer greater than or equal to 2
Data Source
AI summary
A head up display (HUD) system includes: one or more light sources and one or more phase modulators configured to generate and output a hologram; and a replicator configured to receive the hologram, to generate N replications of the hologram from the hologram, and to output the N replications of the hologram, where N is an integer greater than or equal to 2.