HUD Movable Screen Shielding Stray Light
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Solution Overview
Problem
Existing head-up display systems face challenges in smoothly moving screens at high speeds while protecting surrounding components from intense stray light, which can cause overheating.
Innovation Solution
The image display device incorporates a movable screen and a fixed screen, where only the movable screen is driven to move within a necessary range for depth images, and a fixed support part shields the surrounding area from stray light using a cover with an opening that guides light, allowing the screen to protrude and support the movable part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one screen is used to display both depth images and fixed images, then the device complexity is reduced, but the movement range of the screen is remarkably extended making it difficult to move the screen stably at high speed
Solution Approach 1:
The patent divides the single screen into two separate screens: a movable screen for displaying depth images and a fixed screen for displaying fixed images. This segmentation allows the movable screen to have a limited movement range, enabling stable high-speed movement, while the fixed screen remains stationary to display information with constant visual distance.
2Adaptability or versatility
If the screen moves at high speed over an extended range, then both depth images and fixed images can be displayed, but stray light enters the screen causing surrounding members to be heated to high temperature
Solution Approach 1:
By separating the display functions into two screens, the movable screen only needs to move within a small range for depth images, reducing stray light exposure. The fixed screen handles fixed images without movement, eliminating stray light issues for that function.
Solution Approach 2:
The patent converts the harmful stray light issue into a design constraint that drives the segmentation solution. The limited movement range of the movable screen, initially a constraint, actually reduces stray light exposure and prevents overheating of surrounding members.
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
This configuration enables smooth high-speed movement of the screen for generating depth images while effectively protecting the surrounding components from intense stray light, preventing overheating and ensuring stable operation.
Implementation Method 1
a light source, a movable screen, a fixed screen... The movable screen is irradiated with light from the light source to form an image
Implementation Method 2
a laser light source such as a semiconductor laser can be used as a light source to generate a virtual image. This configuration causes a screen to be scanned with laser light modulated based on a video signal
Implementation Method 3
the light reflected by the windshield is applied to driver's eyes
Implementation Method 4
The optical system uses light from the movable screen and the fixed screen to generate a virtual image
Implementation Method 5
The cover has an opening that guides light from the scanning unit to the movable screen and the fixed screen
Data Source
AI summary
The image display device further includes a scanning unit that uses light from the light source to scan the movable screen and the fixed screen, and an optical system that uses light from the movable screen and the fixed screen to generate a virtual image, a drive unit that moves the movable screen, a structure body that supports the fixed screen at a fixed position such that the fixed screen is closer to the optical system than the movable screen is, and a magnetic cover that covers a movable part of the drive unit. The structure body covers an area around an opening of the magnetic cover to shield the movable part of the drive unit from stray light travelling backward via the optical system.