Holographic Optical Element Depth Perception in Vehicle Windshield Displays
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Solution Overview
Problem
Current display devices for projecting virtual images on vehicle windshields lack a natural sense of depth, as the virtual images are not effectively aligned with the background, leading to a diminished sense of depth perception for the user.
Innovation Solution
The display device incorporates a holographic optical element that reflects light at a specific angle of incidence to a Bragg reflection surface, combined with a concave mirror and a display panel inclined at an increased angle, to adjust the distances of image light components and enhance the sense of depth by maintaining brightness and optical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional display device projects virtual images on a windshield, then the virtual images are displayed, but the virtual images lack a natural sense of depth and do not align effectively with the background
Solution Approach 1:
The patent introduces a holographic optical element that manipulates light in three-dimensional space to create virtual images with proper depth perception. By using volumetric holographic structures rather than planar reflection, the system achieves natural depth alignment with the background environment, resolving the contradiction between alignment precision and depth perception.
Solution Approach 2:
The patent employs a concave mirror with specific curvature parameters to adjust the optical path and focal distances of image light components. By changing the geometric parameters of the optical system (mirror curvature, element positioning), the virtual images achieve both precise alignment with the background and natural depth perception, simultaneously improving both contradiction aspects.
2Ease of operation
If the display panel angle is increased to improve depth perception, then the sense of depth is enhanced, but the optical characteristics and brightness may be compromised
Solution Approach 1:
The holographic optical element acts as an intermediary between the display panel and the viewer, manipulating light paths to maintain brightness while enabling the inclined display panel configuration. The element refracts and reflects light to preserve illumination intensity even when the panel is angled, allowing depth enhancement without brightness loss.
3Manufacturing precision
If the holographic optical element reflects light at a specific angle to a Bragg reflection surface, then the image light distances are adjusted for depth perception, but the system complexity increases
Solution Approach 1:
The holographic optical element performs multiple functions simultaneously: it reflects light at specific angles for depth adjustment, maintains optical characteristics, and works with the concave mirror system. This multi-functionality reduces the need for separate adjustment mechanisms, managing system complexity while achieving precise image light distance control.
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 configuration enhances the sense of depth perception of virtual images by adjusting the image light distances, ensuring they align with the background while maintaining optical quality and brightness, thereby providing a more natural and immersive visual experience.
Implementation Method 1
the holographic optical element reflects light incident at a specific angle of incidence on a Bragg reflection surface and transmits the light incident at an angle of incidence different from the specific angle of incidence
Implementation Method 2
a concave mirror which reflects the image light reflected by the holographic optical element
Data Source
AI summary
According to one embodiment, a display device includes an illumination device which emits illumination light, a display panel which modulates the illumination light and emits image light, a holographic optical element which reflects the image light emitted from the display panel, and a concave mirror which reflects the image light reflected by the holographic optical element, wherein when the image light reflected by the concave mirror enters a projection member, a virtual image is projected, and the holographic optical element reflects light incident at a specific angle of incidence on a Bragg reflection surface and transmits the light incident at an angle of incidence different from the specific angle of incidence.