Vehicle Display Photochromic Layer for HUD Reflection Control
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Solution Overview
Problem
Head-up displays (HUDs) in vehicles can create a reflected image on windshields at night, distracting drivers and increasing the risk of accidents.
Innovation Solution
A display device for vehicles featuring a light control layer with photochromic lines that can change from transparent to opaque when exposed to ultraviolet light, allowing for selective control of the viewing angle to reduce reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the HUD displays information with illuminated pixels, then the driver receives necessary visual information, but the illuminated pixels create reflected images on the windshield that distract the driver
Solution Approach 1:
The patent applies photochromic material that changes its optical properties (from transparent to opaque) when exposed to ultraviolet light. This allows the light control layer to dynamically adjust its appearance, blocking reflected light from reaching the driver's eyes while still allowing the HUD information to be displayed and viewed by the driver directly.
Solution Approach 2:
The patent introduces a light control layer as an intermediary component between the display panel and the windshield. This intermediate layer selectively controls light transmission and reflection, blocking harmful reflected light while maintaining the useful function of displaying information to the driver.
2Object-affected harmful factors
If the light control layer uses photochromic material to block reflected light, then driver distraction is reduced, but the viewing angle control complexity increases
Solution Approach 1:
The photochromic material in the light control layer automatically responds to ultraviolet light exposure by changing its transparency state without requiring external control mechanisms. This self-service property simplifies the overall system complexity, as the material autonomously adjusts to block reflected light based on environmental conditions.
Solution Approach 2:
The patent utilizes the inherent parameter change capability of photochromic material, which transitions between transparent and opaque states based on ultraviolet light exposure. This natural parameter change eliminates the need for complex mechanical or electronic control systems, reducing device complexity while achieving effective light blocking.
3Object-affected harmful factors
If the photochromic lines are made opaque to block reflections, then the reflected image visibility is reduced, but the brightness of the displayed image may be affected
Solution Approach 1:
The light control layer is positioned specifically between the display panel and the windshield, targeting only the reflected light path. This localized application ensures that the photochromic material blocks reflected light while not interfering with the direct light path from the display to the driver's eyes, thereby maintaining image brightness.
Solution Approach 2:
The patent divides the light control functionality into specific regions using photochromic lines that can be selectively activated. This segmentation allows different portions of the display area to have different light control characteristics, enabling reflection blocking in specific zones while maintaining brightness in viewing zones.
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 the visibility of the HUD image in the windshield reflection, minimizing driver distraction and enhancing safety, while also optimizing brightness and power consumption.
Implementation Method 1
a first light control layer disposed between the display panel and the window and including first photochromic lines, wherein the first photochromic lines extend in the first direction, are arranged along the second direction, and include a photochromic material
Data Source
AI summary
The present disclosure relates to a display device. The display device may be used for a vehicle and may include a display panel, a window, and a first light control layer. The display panel includes pixels arranged along a first direction and a second direction crossing the first direction. The window is disposed on the display panel. The first light control layer is disposed between the display panel and the window and including first photochromic lines. The first photochromic lines extend in the first direction and are arranged along the second direction and include a photochromic material.