Integrated Phase Retardance Mirror for Compact Vehicle HUD
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Solution Overview
Problem
Existing head-up displays for vehicles are bulky and complex, with a large front and rear width due to the separation and independent mounting of phase retardance and polarization reflection mirrors, which complicates assembly and increases the number of components.
Innovation Solution
A compact head-up display design that integrates a phase retardance mirror with a rear mirror and a phase retarder on its front surface, along with a polarization reflection mirror, to minimize the front and rear width by sharing a common holder and simplifying the structure, while maintaining efficient image light conversion and reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phase retardance mirror and polarization reflection mirror are separated and independently mounted, then each mirror can be optimized for its specific function, but the front and rear width of the head up display increases and the number of components increases
Solution Approach 1:
The patent combines the phase retardance mirror and polarization reflection mirror into a single integrated mirror assembly. The phase retardance layer is deposited on the rear surface of the polarization reflection mirror, creating a unified component that performs both phase retardance and polarization reflection functions simultaneously. This merging eliminates the need for separate mounting of two independent mirrors, thereby reducing the front and rear width of the head up display while maintaining the functional optimization of both mirrors.
Solution Approach 2:
The integrated mirror assembly serves multiple functions: it acts as a polarization reflection mirror for reflecting image light to the windshield, and simultaneously functions as a phase retardance mirror for converting the phase of image light. By combining these functions into a single component, the design reduces the total number of components and simplifies the overall structure while maintaining the specialized functionality of each mirror type.
2Reliability
If phase retardance mirror and polarization reflection mirror are separated and independently mounted, then each mirror can be optimized for its specific function, but the number of components and assembly complexity increases
Solution Approach 1:
The patent merges two separate mirror components into one integrated mirror assembly. The phase retardance layer is applied to the rear surface of the polarization reflection mirror, creating a single component that replaces what would otherwise be two separate mirrors. This reduces the number of components from two independent mirrors with separate mounting structures to one unified assembly, thereby reducing assembly complexity while preserving the functional optimization of both mirror types.
3Reliability
If phase retardance mirror and polarization reflection mirror are separated and independently mounted, then each mirror can be optimized for its specific function, but assembly complexity increases
Solution Approach 1:
By integrating the phase retardance layer onto the rear surface of the polarization reflection mirror, the patent eliminates the need for separate assembly steps for mounting two independent mirrors. The integrated structure allows for simpler manufacturing and assembly processes, as the combined component can be installed as a single unit rather than requiring the precise alignment and mounting of two separate mirror assemblies.
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 design achieves a more compact and efficient head-up display with reduced component count and assembly complexity, enhancing space utilization within vehicles while maintaining effective image projection onto the windshield.
Implementation Method 1
a polarized light plate configured to linearly polarize the image light emitted from the display panel
Implementation Method 2
a reflection mirror configured to reflect the image light to a windshield of the vehicle
Implementation Method 3
a phase retardance mirror spaced apart from the reflection mirror to reflect the image light forward while converting a phase of the image light
Implementation Method 4
a polarization reflection mirror disposed between the reflection mirror and the phase retardance mirror and configured to reflect the image light passing through the polarized light plate to the phase retardance mirror
Data Source
AI summary
A head up display for a vehicle, the head up display including a display panel configured to emit image light; a polarized light plate configured to linearly polarize the image light emitted from the display panel; a reflection mirror configured to reflect the image light to a windshield of the vehicle; a phase retardance mirror spaced apart from the reflection mirror to reflect the image light forward while converting a phase of the image light, wherein the phase retardance mirror includes a rear mirror and a phase retarder disposed on a front surface of the rear mirror; and a polarization reflection mirror disposed between the reflection mirror and the phase retardance mirror and configured to reflect the image light passing through the polarized light plate to the phase retardance mirror, wherein the image light reflected to the phase retardance mirror is converted in phase by the phase retardance mirror and reflected by the phase retardance mirror to pass through the polarization reflection mirror.