HUD Opening Structure for Stray Light and Dust Control
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Solution Overview
Problem
Conventional head-up displays fail to effectively manage stray light from outside sources and prevent dust and dirt entry, leading to glare and potential damage to the image generator.
Innovation Solution
A display device with a light-transmissive member and a movable opening portion that adjusts its position to optimize the path of outside light, ensuring it does not enter the user's field of view and reducing dust and dirt ingress, while also projecting images onto a display medium like a vehicle's windshield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a fixed opening portion is used in conventional head-up displays, then the structure is simple, but outside light enters the optical path causing glare and dust/dirt enters damaging the image generator
Solution Approach 1:
The opening portion is made movable along the optical path between the display medium and image generator. By dynamically adjusting the position of the opening portion, the system can block outside light from entering the optical path and prevent dust/dirt from reaching the image generator, while maintaining a relatively simple structural design.
2Object-affected harmful factors
If a light-transmissive member is added to block outside light, then glare is reduced, but the device structure becomes more complex
Solution Approach 1:
A light-transmissive member is introduced as an intermediary element in the optical path. This member can selectively transmit or block light while maintaining the overall optical functionality, reducing glare without requiring complete structural redesign of the optical system.
3Illumination intensity
If the opening portion is positioned to block outside light, then glare is reduced, but the adjustment mechanism increases device complexity
Solution Approach 1:
The opening portion is designed to be movable along the optical path, allowing dynamic adjustment of its position to optimize light blocking. This dynamic capability enables the system to adapt to different lighting conditions while maintaining a relatively simple adjustment mechanism.
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 effectively reduces glare from outside light and prevents dust and dirt from entering the display device, enhancing user experience by minimizing distractions and protecting the image generator from excessive light and debris.
Implementation Method 1
outside light that passes along the reference and line enters the light-transmissive member... after the reference outside light is reflected at the light-transmissive member
Data Source
AI summary
In a display device, an opening portion includes a first edge portion on a forward side and a second edge portion on a backward side of the opening portion in a traveling direction of a mobile object. When the display device is mounted on the mobile object, a line connecting an upper end of the first edge portion and a lower end of the second edge portion is taken as a reference line, and outside light that passes along the reference line and enters a light-transmissive member is taken as reference outside light, the reference outside light for the case where the opening portion is in a first position arrives at a lower position, at least partially in an optical path after the reference outside light is reflected at the light-transmissive member, than the reference outside light for the case where the opening portion is in the second position.