Head-Up Display Dual Concave Reflector Vertical Crossing
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Solution Overview
Problem
Conventional head-up displays face design restrictions due to the proximity of the second display surface to the optical path of the first image light, limiting the degree of freedom in designing virtual image display distances.
Innovation Solution
A head-up display design featuring a first and second display surface with differing optical path lengths, utilizing a first and second concave reflector to cross each other vertically, allowing the second display surface to be spaced further from the optical path and enabling improved design flexibility by positioning the second virtual image lower in the vertical direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the second display surface is positioned closer to the viewer to achieve a shorter optical path length for the second virtual image, then the display distance of the second virtual image is reduced, but the design freedom is restricted due to overlap with the optical path of the first image light
Solution Approach 1:
The patent introduces a vertical dimension to separate the optical paths of the first and second image lights. The first reflector and second reflector are positioned at different vertical heights, allowing the second display surface to be closer to the viewer without overlapping the first image light path. This dimensional separation resolves the contradiction by enabling shorter optical path length while maintaining design freedom.
Solution Approach 2:
The patent divides the reflection function into two separate reflectors (first reflector and second reflector) positioned at different vertical locations. This segmentation allows independent optimization of each optical path, enabling the second display surface to achieve shorter optical path length without interfering with the first image light path, thus resolving the contradiction between display distance and design freedom.
2Length of moving object
If the second display surface is positioned closer to the viewer to reduce optical path length, then the second virtual image appears at a lower display distance, but the second display surface must be placed in a restricted space that does not overlap with the first image light path
Solution Approach 1:
The patent utilizes the vertical dimension to create separate spatial zones for the first and second image light paths. By positioning the first reflector and second reflector at different vertical heights, the system expands the available space for the second display surface without causing overlap with the first image light path, thus resolving the contradiction between optical path length and available space.
3Device complexity
If conventional reflectors are used without vertical crossing configuration, then the structure is simpler, but the ability to correct distortion and maintain high magnification is reduced
Solution Approach 1:
The patent employs curved reflector surfaces (first reflector and second reflector) that are configured to cross each other vertically. This curvature and crossing configuration enables the reflectors to correct distortion and maintain high magnification of the displayed images, resolving the contradiction between device complexity and distortion correction capability by using geometrically optimized curved surfaces.
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 the display of multiple virtual images with different distances, enhancing design freedom and maintaining high magnification and distortion correction capabilities.
Implementation Method 1
a first concave reflector to reflect the first image light and the second image light
Implementation Method 2
a second concave reflector to reflect towards the transmission reflection surface the first image light and the second image light that have been reflected by the first concave reflector
Data Source
Figure 1
Figure 2
AI summary
Provided is a head-up display capable of displaying a plurality of virtual images presented at different distances while increasing the design flexibility in the display device for creating the virtual images. The head-up display comprises: a first display surface 11 disposed to extend the light path of first image light N1 emitted toward a viewer and a second display surface 21 disposed to make the light path of second image light N2 emitted shorter than that of the first image light N1; a first concave reflector 30 for reflecting the first image light N1 and the second image light N2; and a second concave reflector 40 for reflecting the image light reflected from the first concave reflector 30. The first concave reflector 30 is configured such that the first image light N1 and the second image light N2 intersect with each other in the vertical direction between the first concave reflector 30 and the second concave reflector 40.