Head-Up Display Optics With Free-Form Aberration Correction
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Solution Overview
Problem
Conventional head-up display devices struggle to correct aberration effectively when displaying larger virtual images, limiting their ability to provide clear and accurate visual information to drivers.
Innovation Solution
The head-up display device incorporates a display unit with a reflection mirror and a transparent cover. The reflection mirror enlarges and reflects the display light, while the transparent cover, featuring a free-form face, corrects aberrations in the enlarged light, ensuring accurate and clear virtual image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If only a magnifying glass is used to enlarge the virtual image, then the device complexity is low, but the aberration correction capability is insufficient
Solution Approach 1:
The optical system is segmented into distinct functional components: a magnifying lens for image enlargement and a free-form transparent cover for aberration correction. This segmentation allows each component to be optimized for its specific function, with the magnifying glass handling enlargement and the free-form cover handling aberration correction, thereby resolving the contradiction between maintaining low device complexity and achieving high aberration correction capability
Solution Approach 2:
The transparent cover serves multiple functions: it acts as a protective cover for the optical components while simultaneously functioning as a free-form aberration correction element. This multi-functionality reduces the need for additional separate components, maintaining device simplicity while achieving effective aberration correction
2Area of moving object
If a larger virtual image is displayed, then the visibility and information quantity are improved, but the aberration correction becomes more difficult
Solution Approach 1:
The transparent cover is designed with a free-form surface that provides localized aberration correction tailored to the specific requirements of large virtual image display. The free-form geometry allows for precise control of light paths across different regions of the enlarged image, enabling effective aberration correction specifically optimized for larger image sizes rather than a generic correction approach
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 allows for improved aberration correction and enlargement of virtual images, enhancing the clarity and accuracy of the displayed information, thus enabling a more effective head-up display for drivers.
Implementation Method 1
a reflection mirror that is accommodated in the housing and reflects enlarged display light obtained by enlarging the display light emitted from the display
Implementation Method 2
a transparent cover that closes the opening and transmits light, the transparent cover having a free-form face that performs aberration correction on the enlarged display light reflected by the reflection mirror
Implementation Method 3
displays a virtual image by reflecting display light emitted toward a light transmissive reflecting member toward an eye point by the reflecting member
Data Source
AI summary
A head-up display device includes a housing and a display unit. The housing has an opening facing a window shield, and the display unit is assembled therein. The display unit includes a display, a reflection mirror, and a transparent cover. The display is accommodated in the housing and emits display light. The reflection mirror is accommodated in the housing, and reflects enlarged display light obtained by enlarging the display light emitted from the display toward the window shield through the opening. The transparent cover is a cover that closes the opening and transmits light, and includes a free-form face that performs aberration correction on the enlarged display light reflected by the reflection mirror.