HUD Optical Path Layout for Compact Oblique Virtual Images
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Solution Overview
Problem
Existing head-up display (HUD) systems require large installation spaces and complex adjustments to form oblique images, which compromises their compactness and convenience.
Innovation Solution
A display device comprising a first image source, a refraction element, and a first reflection element, where the refraction element refracts image light from a partial region of the display area, and the image light forms a virtual image with a proximal end close to the observation area and a distal end away from it, achieving an oblique image without the need for large installation spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional HUD systems use traditional optical designs to form oblique images, then the oblique image effect is achieved, but the installation space requirement increases and device complexity increases
Solution Approach 1:
The patent introduces a refraction element with a specific optical path design that changes the dimensional relationship between the image source and the virtual image. By controlling the optical distance along the direction from the first end to the second end of the display area, the system achieves oblique image formation without requiring additional installation space, effectively utilizing the existing optical path dimensions.
Solution Approach 2:
The patent modifies the optical parameters by implementing a refraction element that creates a non-uniform optical distance distribution across the display area. The optical distance gradually changes from the first end to the second end, which transforms the light propagation characteristics to achieve oblique image formation while maintaining a compact structure.
2Shape
If conventional HUD systems use traditional optical designs to form oblique images, then the oblique image effect is achieved, but the device structure becomes more complex
Solution Approach 1:
The patent combines the refraction element with the existing display area and reflection element into an integrated optical system. The refraction element is positioned to work in conjunction with the image source and reflection element, merging multiple optical functions into a unified structure that reduces overall system complexity while achieving oblique image formation.
Solution Approach 2:
The patent applies the refraction element selectively to specific regions of the optical path, creating local optical distance variations only where needed to achieve the oblique image effect. This localized approach allows the rest of the optical system to maintain its original simple structure, reducing overall device complexity.
3Shape
If the optical distance is uniformly distributed, then the optical path is simple, but the oblique image effect cannot be achieved
Solution Approach 1:
The patent deliberately introduces a non-uniform optical distance parameter along the direction from the first end to the second end of the display area. This parameter variation is controlled through the refraction element's design, creating the necessary conditions for oblique image formation while maintaining a relatively simple optical path structure.
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 display device enables the formation of oblique images with reduced installation requirements and a compact structure, enhancing the usability and flexibility of HUD systems.
Implementation Method 1
the refraction element is configured to refract image light emitted from at least partial region of the first display area
Implementation Method 2
the image light refracted by the refraction element is reflected by the first reflection element and propagated to an observation area to form a first virtual image
Data Source
AI summary
A display device, a head-up display and a transportation equipment are provided. In the display device, a first image source includes a first display area; a refraction element is configured to refract image light emitted from at least partial region of the first display area; the image light refracted by the refraction element is reflected by a first reflection element and propagated to an observation area to form a first virtual image; along a direction from a first end of the at least partial region to a second end of the at least partial region, an optical distance of at least part of the image light emitted from the at least partial region between a light incident surface of the refraction element and a light exiting surface of the refraction element gradually decreases.