Dual-Layer Head-Up Display Using Polarization Separation
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Solution Overview
Problem
Existing head-up display systems fatigue drivers by requiring frequent eye focus adjustments to view projected 2D images, increasing the risk of accidents due to prolonged eye strain.
Innovation Solution
A head-up display device with a dual-layer display function utilizing a display component, first and second optical components, and a synthesizing component to output and process light in different polarization directions, allowing for the dual-layer display of state and augmented reality information without requiring frequent eye focus adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a 2D display image is projected to a fixed distance in front of the driver, then the driver can see the information without looking down, but the driver has to frequently adjust the focus of his or her eyes which causes eye fatigue
Solution Approach 1:
The patent transitions from a single 2D display plane to a dual-layer display system with different depth positions. The first image is displayed at a first distance from the driver's eyes, while the second image is displayed at a second distance that is farther away. This dimensional addition in the depth direction allows the driver to view information at multiple focal depths, reducing the need for frequent focus adjustment and thereby alleviating eye fatigue.
2Reliability
If important information is projected onto the front windshield, then the driver can get instantaneous reading without diverting field of view, but the driver's eyes become easily fatigued due to frequent focus adjustment
Solution Approach 1:
The patent introduces a dual-layer display architecture where information is presented at two distinct depth planes. The first image appears at a closer distance while the second image appears at a farther distance, both within the driver's forward field of view. This multi-depth presentation allows critical safety information to remain accessible without requiring the driver to repeatedly refocus eyes, thus maintaining driving safety while reducing eye fatigue.
3Device complexity
If a single 2D display image is used, then the display structure is simple, but the driver must frequently adjust focus which causes eye strain and potential accidents
Solution Approach 1:
The patent adds a depth dimension to the display system by implementing dual-layer imaging at different distances from the driver. While this increases structural complexity compared to a single 2D display, it significantly improves driving safety by eliminating the need for frequent focus adjustment. The additional optical components required for dual-layer display are justified by the substantial safety benefit of preventing accidents caused by eye fatigue.
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
Enables comfortable viewing of dual-layer information, with state information displayed closer and augmented reality information at a farther distance, reducing eye strain and minimizing the risk of accidents.
Implementation Method 1
the first optical component is configured to transmit the first projection light and third projection light to the synthesizing component, and to reflect the second projection light to the second optical component, wherein the third projection light has the first polarization direction
Implementation Method 2
the second optical component is configured to convert the polarization direction of the second projection light from the second polarization direction to the first polarization direction to obtain the third projection light
Data Source
AI summary
A head-up display device, a method for controlling the same, and a vehicle are provided. The head-up display device includes a display component, a first optical component, a second optical component, and a synthesizing component. The light in different polarization directions or states can be transmitted or reflected by the first optical component, so that state information projection light and augmented reality information projection light can be separated from each other to thereby be dual-layer displayed. For example, augmented reality information can be displayed at a longer distance from eyes of a driver so that the focus of the human eyes does not need to be adjusted frequently to thereby make it comforter to view the information so as to eliminate a hidden risk.