Vehicle Head-Up Display Compact Optical Path
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Solution Overview
Problem
Conventional head-up displays for vehicles are bulky due to the spatial requirements of their optical components, which hinders compact design and efficient assembly.
Innovation Solution
The proposed head-up display configuration includes a display panel, a polarized light plate, a reflective mirror, and a phase delay mirror, where the phase delay mirror is larger than the other components and positioned between them, forming a zigzag optical path to minimize the overall width and optimize the arrangement of these components within a holder, allowing for a compact and efficient assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional optical components are arranged in a traditional configuration, then the optical path can be established, but the width of the head up display in the forward and backward direction increases
Solution Approach 1:
The patent transforms the traditional linear optical path into a zigzag configuration by utilizing the phase delay mirror to reflect light at oblique angles. This dimensional change in the optical path arrangement allows the system to achieve the required optical functionality while significantly reducing the forward-backward width of the display assembly.
Solution Approach 2:
The patent positions the polarized light plate, polarized light reflective mirror, and phase delay mirror in a nested configuration where components are closely integrated. The polarized light plate is disposed under and between the polarized light reflective mirror and the phase delay mirror, creating a compact nested structure that minimizes the overall width while maintaining functional separation.
2Length of moving object
If the phase delay mirror is positioned between the polarized light plate and the polarized light reflective mirror, then the width is minimized, but the assembly precision requirement increases
Solution Approach 1:
The patent introduces a holder structure that serves as an intermediary component to precisely position and fix the polarized light plate, polarized light reflective mirror, and phase delay mirror. The holder includes specific openings and mounting positions that ensure accurate alignment of the optical components, thereby reducing the assembly precision requirements for the components themselves.
3Volume of moving object
If the optical components are closely positioned to minimize width, then the compactness is improved, but the heat dissipation capability may be affected
Solution Approach 1:
The patent employs thin film structures for the polarized light plate and reflective mirrors, which allow for close positioning of components while maintaining effective heat dissipation pathways. The thin film design reduces thermal mass and allows heat to dissipate efficiently through the compact structure without requiring large spacing between components.
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 minimizes the width and total size of the head-up display while enhancing assembly efficiency and maintainability by closely positioning the polarized light reflective mirror and phase delay mirror, achieving a compact and simple structure.
Implementation Method 1
a polarized light plate configured to make the image light emitted from the display linearly polarized
Implementation Method 2
a reflective mirror configured to reflect the image light on a windshield of a vehicle
Implementation Method 3
a phase delay mirror configured to convert a phase of the light inputted from the polarized light plate and reflect the converted phase to the polarized light reflective mirror
Data Source
AI summary
A head up display for a vehicle according to an embodiment includes a display panel configured to emit an image light; a polarized light plate configured to make the image light emitted from the display linearly polarized; a reflective mirror configured to reflect the image light onto a windshield of a vehicle; a polarized light reflective mirror configured to be disposed to face the reflective mirror; and a phase delay mirror configured to convert a phase of the light inputted from the polarized light plate and reflect the converted phase to the polarized light reflective mirror, and to convert a phase of the light reflected from the polarized light reflective mirror and reflect the converted phase to the polarized light reflective mirror, thereby minimizing a width in the forward and backward direction.