Projection Lens Relay Beam Splitting for Stereoscopic HUDs
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Solution Overview
Problem
Existing head-up display (HUD) systems suffer from suboptimal stereoscopic displaying effects due to issues such as image resolution loss, distortion, and crosstalk between left-eye and right-eye images, particularly in stereoscopic displaying technologies based on a binocular parallax principle.
Innovation Solution
A projection lens comprising a first imaging lens, a light adjustment apparatus, and a second imaging lens is used to split imaging light into spatially distributed sub-lights for left-eye and right-eye images, with the light adjustment apparatus performing beam splitting on a relay image plane to enhance stereoscopic displaying, while avoiding image distortion and crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a diffusion screen is used for beam splitting in existing HUD systems, then stereoscopic displaying function is achieved, but image resolution loss, image distortion, and crosstalk between left-eye and right-eye images occur
Solution Approach 1:
The patent introduces a light adjustment apparatus as an intermediary component between the imaging light source and the projection lens. This apparatus includes beam splitting elements that separate left-eye and right-eye imaging light without requiring a diffusion screen, thereby achieving stereoscopic display while avoiding image resolution loss and distortion.
Solution Approach 2:
The patent replaces the diffusion screen-based beam splitting mechanism with a more precise optical system consisting of beam splitting elements and light adjustment apparatus. This substitution eliminates the harmful scattering effects of diffusion screens while maintaining the stereoscopic displaying function.
2Device complexity
If the distance between the light adjustment apparatus and the imaging light emission position is increased, then the apparatus structure is simplified, but the beam splitting effect deteriorates
Solution Approach 1:
The patent optimizes the spatial arrangement by positioning the relay image plane at a specific distance from the light adjustment apparatus. This dimensional optimization ensures that the beam splitting elements receive well-collimated light, achieving good beam splitting effect without requiring excessive distance that would increase device complexity.
3Reliability
If stereoscopic displaying technology based on binocular parallax is applied to HUD, then driving safety is improved, but the displaying effect has room for improvement due to image quality issues
Solution Approach 1:
The patent segments the imaging light into distinct left-eye and right-eye sub-lights using beam splitting elements. This segmentation ensures that each eye receives only its designated image without crosstalk, thereby improving the overall displaying effect while maintaining the safety benefits of stereoscopic display.
Solution Approach 2:
The patent applies different optical treatments to different regions of the optical path. The light adjustment apparatus is specifically designed to optimize the quality of imaging light in different spatial zones, ensuring that left-eye and right-eye images maintain high quality throughout their respective optical paths without mutual interference.
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 improves stereoscopic displaying effect by ensuring good beam splitting and reducing image distortion and crosstalk, maintaining a simple structure and low costs, with minimal impact on the image generation apparatus' volume.
Implementation Method 1
The first imaging lens is configured to: receive imaging light, and perform imaging on the imaging light on a side that is of the light adjustment apparatus and that is close to the first imaging lens, to form a relay image plane
Implementation Method 2
The light adjustment apparatus is configured to: split the imaging light on the relay image plane. after split, the first imaging sub-light and the second imaging sub-light in the imaging light are projected onto the second imaging lens in different directions
Data Source
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AI summary
A projection lens (5), an image generation apparatus (1), a display device (100), and a transportation means (200) are provided, and relate to the field of light display technologies, to improve stereoscopic displaying effect. The projection lens (5) includes a first imaging lens (51), a light adjustment apparatus (53), and a second imaging lens (52). The first imaging lens (51) is configured to: receive imaging light (P1), and perform imaging on the imaging light (P1) on a side that is of the light adjustment apparatus (53) and that is close to the first imaging lens (51), to form a relay image plane (50). The imaging light (P1) includes first imaging sub-light (P11) and second imaging sub-light (P12), and the first imaging sub-light (P11) and the second imaging sub-light (P12) are respectively used to form a left-eye image and a right-eye image for implementing stereoscopic displaying. The light adjustment apparatus (53) is configured to split the imaging light (P1) on the relay image plane (50). after split, the first imaging sub-light (P11) and the second imaging sub-light (P12) in the imaging light (P1) are projected onto the second imaging lens (52) in different directions. The second imaging lens (52) is configured to project the first imaging sub-light (P11) and the second imaging sub-light (P12). The projection lens (5) may be used in the image generation apparatus (1), the display device (100), and the transportation means (200).