Autostereoscopic HUD Mode Switching and Reflection Suppression
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Solution Overview
Problem
Conventional head-up displays (HUDs) in vehicles have a limited field of view and are prone to interfering reflections, which affect the visibility and comfort of the driver, especially due to restricted installation space and inadequate antireflection techniques.
Innovation Solution
A method for operating a visual field display apparatus with an autostereoscopic planar pixel arrangement that switches between stereoscopic, monoscopic, and monocular modes based on surroundings and user parameters, combined with a reflection-suppressing deflection arrangement to enhance visibility and comfort by adapting the display mode to the environment and user needs, and suppressing ambient light reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a conventional projection optical unit is used in the HUD, then the display image can be generated, but the field of view is restricted and the installation space requirement is large
Solution Approach 1:
The projection optical unit is divided into multiple separate components: a display unit with pixel arrangement and multiple independent deflection elements (mirrors or prisms). Each deflection element can be independently positioned and angled to deflect light beams in different directions, enabling a expanded field of view without requiring a single large-volume optical system.
Solution Approach 2:
The patent arranges multiple deflection elements in a nested or compact configuration where each element is positioned to work in sequence with the others. This nested arrangement allows the system to achieve a large effective optical path and field of view while maintaining a compact overall installation footprint within the vehicle dashboard.
2Object-affected harmful factors
If a covering panel is used to seal the projection unit, then reflections are prevented, but the display visibility is reduced due to light absorption
Solution Approach 1:
The patent extracts the reflection suppression function from a separate covering panel and integrates it directly into the deflection elements themselves. The deflection elements are designed with reflection-suppressing surfaces (such as black-coated backs or specific geometric configurations) that actively absorb or redirect ambient light away from the user's view, eliminating the need for an additional sealing panel that would block display light.
Solution Approach 2:
The deflection elements serve as intermediary components between the display unit and the user's eye. These intermediaries perform dual functions: deflecting the display light beams toward the user while simultaneously suppressing ambient light reflections through their specialized surface treatments and geometric designs, thus mediating between the conflicting requirements of visibility and reflection suppression.
3Reliability
If a stereoscopic display mode is used, then depth perception is improved, but the visibility is reduced under certain surrounding conditions
Solution Approach 1:
The patent implements dynamic switching between different display modes (stereoscopic, monoscopic, monocular) based on real-time analysis of surrounding conditions, user preferences, and environmental factors. The control unit automatically adjusts the display mode to optimize both depth perception and visibility, making the system adaptive rather than static.
Solution Approach 2:
The display unit is designed to perform multiple functions through a single unified system that can operate in different modes. The same pixel arrangement and deflection elements can generate both stereoscopic images for depth perception and monoscopic images for maximum visibility, making the system universal and adaptable to various operating conditions without requiring separate hardware systems.
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 solution significantly expands the field of view, improves the visibility and comfort of the driver by adapting the display mode to the surroundings and user conditions, and effectively suppresses ambient light reflections, enabling a more immersive and reliable 3D experience.
Implementation Method 1
an autostereoscopic planar pixel arrangement for generating a projection light beam with display content
Implementation Method 2
which projects this projection light beam onto a partly transparent projection screen, for example the windshield of the motor vehicle
Implementation Method 3
from where it is reflected to the driver
Implementation Method 4
deflection means such as a matrix-like arrangement of small lenses, for example, are provided in the beam path between the display unit and the windshield, the deflection means deflecting the light beams from different luminous spots in different emission directions
Data Source
AI summary
A method operates a visual field display device, particularly for a motor vehicle, which includes an autostereoscopic planar pixel array for generating a projecting light beam containing a display content, and is designed to project this onto a partially transparent, reflective projection screen, particularly a front windscreen of the motor vehicle, in such a way that a virtual display image superimposed into a field of vision of a user is generated behind the screen. The method provides at least one surroundings parameter and/or user parameter, and switches between at least two qualitatively different 3D, 2D and/or monocular operating modes of the planar pixel array, depending on the surroundings parameters and/or user parameters provided, in order to adapt the virtual display image to qualitative operational changes relating to the surroundings and/or the user of the visual field display device.