Windshield HUD Layout for High-Resolution Display and Sunlight Blocking
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Solution Overview
Problem
Existing head-up-display (HUD) systems face challenges in achieving both downsizing and high resolution while preventing damage to liquid crystal panels due to sunlight penetration, leading to reduced image quality and safety concerns from detachment during accidents.
Innovation Solution
An in-vehicle information display system that uses the windshield glass as a reflection surface, incorporating optical components to project high-resolution images and absorb or redirect sunlight, ensuring the images are displayed at a distant position on the windshield, and using polarizers to block P-polarized sunlight components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a small liquid crystal display element is used for downsizing, then the apparatus size is reduced, but the resolution of the projection images deteriorates
Solution Approach 1:
The patent divides the display system into two independent parts: a small liquid crystal display element for generating images and a separate transmitting/reflecting member (hot mirror) for optical processing. This segmentation allows the display element to remain small while the optical system handles the resolution requirements through proper light management and reflection geometry.
Solution Approach 2:
The transmitting/reflecting member acts as an intermediary between the liquid crystal display element and the windshield glass. It receives light from the small display element, processes it through selective transmission and reflection, and directs it to the windshield, thereby enabling high-resolution image projection without requiring the display element itself to be large.
2Reliability
If the transmitting/reflecting member is arranged separately from the liquid crystal display panel, then the panel is protected from sunlight damage, but the device complexity increases
Solution Approach 1:
The patent extracts the transmitting/reflecting member (hot mirror) from the liquid crystal display panel assembly and positions it separately in the optical path. This extraction serves two purposes: it protects the liquid crystal panel from direct sunlight exposure while maintaining the optical functionality of the system. The hot mirror is placed between the display element and the windshield glass to intercept and redirect sunlight away from the panel.
Solution Approach 2:
The transmitting/reflecting member serves as an intermediary component that mediates between the liquid crystal display panel and the external sunlight environment. It selectively transmits display light while reflecting harmful sunlight, thereby protecting the panel without requiring direct contact or integration that would increase structural complexity.
3Area of stationary object
If the windshield glass is used as a reflection surface, then the system achieves large-scale virtual images, but sunlight penetration damages the liquid crystal panel
Solution Approach 1:
The patent converts the harmful effect of sunlight into a beneficial function by using the transmitting/reflecting member (hot mirror) to reflect sunlight away from the liquid crystal panel while allowing display light to pass through. The same optical component that enables large-scale virtual image projection on the windshield also serves to protect the panel from sunlight damage by strategically positioning it in the optical path to intercept and redirect harmful rays.
Solution Approach 2:
The transmitting/reflecting member acts as a protective intermediary between the liquid crystal panel and the windshield glass. It receives light from the panel, allows display light to reach the windshield for large-scale image projection, while simultaneously reflecting sunlight away from the panel, thereby enabling both large image display and panel protection functions.
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 system achieves high-resolution, large-scale virtual images with reduced distortion and aberration, protecting the liquid crystal panel from sunlight damage and ensuring safe operation by preventing sunlight from reaching the display apparatus.
Implementation Method 1
causing a windshield glass of a vehicle to reflect image light to display image information
Implementation Method 2
a transmitting/reflecting member (hot mirror) that transmits the display light output from the liquid crystal display panel but reflects the infrared ray
Implementation Method 3
using polarizers to block P-polarized sunlight components
Data Source
AI summary
An information display apparatus that displays image information on a vehicle includes a HUD apparatus projecting a large-scale virtual image onto a distant position and serving as a first information display apparatus arranged between a windshield glass of the vehicle and an instrument panel, and effectively displays a plurality of pieces of the image information by making coordination with a second information display apparatus close to the windshield glass, the second information display apparatus causing a transparent dispersion sheet in the windshield glass to directly reflect a screen of a large-10 scale high-resolution image display panel so that the screen is observed by the driver.