Head-Up Display Anti-Reflection Layers for Clear Field of View
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Solution Overview
Problem
Existing head-up displays (HUDs) are susceptible to external light, which can reduce their visibility and affect the user's field of view.
Innovation Solution
The HUD system incorporates a first display panel, a reflective optical element, and an optical member with reflection reduction layers to minimize the impact of external light. The system includes a second display panel and an optical system that allows image light to travel towards the reflective optical element, further enhancing visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a head-up display is mounted on a movable body, then the user can view display information in the field of view, but external light reflection reduces visibility and affects the field of view
Solution Approach 1:
The patent applies anti-reflection coatings on the optical member surfaces to convert the harmful effect of external light reflection into a beneficial reduction of reflected light. The coating layers are specifically designed to reduce external light reflection while maintaining transmission of display information, thereby improving visibility without compromising the field of view.
Solution Approach 2:
The optical member acts as an intermediary element between the display panel and the user's field of view. By incorporating anti-reflection coatings on this intermediary component, the patent effectively mediates the interaction between external light and the display system, reducing harmful reflections while preserving the display information transmission.
2Illumination intensity
If an optical member is placed between the display panel and reflective optical element, then light transmission is improved, but surface reflections increase
Solution Approach 1:
The anti-reflection coatings on the optical member surfaces convert the harmful surface reflection effect into a beneficial reduction of reflected light. The multi-layer coating structure is specifically engineered to minimize reflection at each interface while maximizing light transmission, thereby resolving the contradiction between improved transmission and reduced surface reflection.
Solution Approach 2:
The optical member incorporates composite anti-reflection coating layers with different refractive indices and thicknesses. This composite structure is designed to create destructive interference for reflected light waves while allowing transmission of display information, effectively reducing surface reflection without compromising light transmission.
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 HUD system effectively reduces the susceptibility to reflected external light, maintaining a clear field of view for the user and enhancing the overall visibility of the displayed images.
Implementation Method 1
Each of the surface of the first display panel and the surface of the optical member includes a reflection reduction layer that reduces light reflection
Implementation Method 2
The reflective optical element at least partially reflects image light from the first image displayed by the first display panel toward a user of the movable body
Data Source
AI summary
A head-up display is mountable on a movable body, and includes a first display panel, a reflective optical element, and an optical member. The first display panel displays a first image. The reflective optical element at least partially reflects image light from the first image displayed by the first display panel toward a user of the movable body. The optical member is between the display panel and the reflective optical element and is light transmissive. The display panel includes a surface facing a surface of the optical member. Each of the surface of the display panel and the surface of the optical member includes a reflection reduction layer to reduce light reflection.