Vehicle Head-Up Display Polarization Switching for Dual-Depth Imaging
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Solution Overview
Problem
Existing head up display systems require two screens or complex structures to project two layers of virtual images with different depths of field, leading to increased cost, volume, and reliability issues due to the need for high-precision motors and wavelength limitations.
Innovation Solution
A head up display system utilizing a single display component and dimming component with a polarization state adjusting unit, metal wire grid, and reflector, which modulates light into different polarization directions in time division manner to project two layers of virtual images onto a windshield, reducing system volume and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two different screens are used to provide light for two layers of virtual images, then the display capability is improved, but the cost and volume of the head up display system increase
Solution Approach 1:
The patent merges the functions of two separate screens into a single screen by using a polarization state adjusting unit that can dynamically switch between different polarization states. This single screen alternates between displaying the first virtual image (with first polarization state) and the second virtual image (with second polarization state), thereby achieving dual-layer display capability while reducing system volume and component count
Solution Approach 2:
The patent implements periodic action by having the polarization state adjusting unit alternately switch between first and second polarization states at different time intervals. During a first time interval, the screen displays content with first polarization state for the first virtual image; during a second time interval, it displays content with second polarization state for the second virtual image. This time-division multiplexing approach enables dual-layer display using a single screen
2Productivity
If a motor driving reflector is used to quickly turn over for double-layer image display, then the display switching capability is improved, but the reliability decreases and cost increases due to high precision requirements
Solution Approach 1:
The patent replaces the mechanical motor-driven reflector system with an optical control system. Instead of using a motor to physically rotate a reflector for switching between display layers, the invention uses an electrically controllable polarization state adjusting unit that switches polarization states through electrical signals. This substitution eliminates mechanical moving parts, thereby improving reliability while maintaining fast switching capability
Solution Approach 2:
The patent changes the optical parameter (polarization state) of the light from the single screen to achieve different display layers. By controlling the polarization state adjusting unit to output light with different polarization states (first polarization state for first virtual image, second polarization state for second virtual image), the system achieves rapid display switching without mechanical movement, improving both reliability and response speed
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
Achieves an augmented reality display effect with reduced system volume and lower costs by using a single display component and dimming component to project polarized light in different polarization directions, enhancing the display effect while maintaining the depth of field for both virtual images.
Implementation Method 1
The polarization state adjusting unit is configured to modulate, in a first display period t1, the imaging light into polarized light in a first polarization direction, where the polarized light in the first polarization direction is reflected to the imaging module through the metal wire grid; modulate, in a second display period t2, the imaging light into polarized light in a second polarization direction
Implementation Method 2
the polarized light in the first polarization direction is reflected to the imaging module through the metal wire grid
Implementation Method 3
the polarized light in the second polarization direction is transmitted to the reflector through the metal wire grid, and reflected to the imaging module through the reflector
Implementation Method 4
the imaging module is configured to transmit the polarized light in the first polarization direction or the polarized light in the second polarization direction to a windshield, and the windshield reflects the polarized light in the first polarization direction or the polarized light in the second polarization direction into a human eye for imaging
Data Source
AI summary
Provided are a head up display system and a vehicle. The head up display system includes a control module, an image source module and an imaging module. The image source module includes a display component and a dimming component, and the dimming component includes a polarization state adjusting unit, a metal wire grid and a reflector. The display component is electrically connected to the control module. The polarization state adjusting unit is configured to modulate the imaging light into polarized light in a first polarization direction and polarized light in a second polarization direction. The imaging module is configured to transmit the polarized light in the first polarization direction or the polarized light in the second polarization direction to a windshield, and the windshield reflects the first polarization direction or the polarized light in the second polarization direction into a human eye for imaging.