Vehicle Window Display Light Control for Windshield Reflection
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Solution Overview
Problem
Display devices in vehicles emit light that can be reflected by the windshield, causing driver distraction and increasing the risk of accidents due to the inability to effectively reduce light reflection at large angles.
Innovation Solution
A display device with a light control structure that adjusts the emitting angle of light, ensuring that only light within a specific effective emitting angle is perceived by the user, thereby reducing reflections from the windshield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display device emits light at large angles to ensure sufficient viewing area, then the viewing coverage is improved, but the light reflection on the windshield increases causing driver distraction
Solution Approach 1:
The patent applies local quality by differentiating the light emission characteristics for different viewing directions. The light control structure allows wide-angle light emission toward the rear of the vehicle while restricting light emission toward the windshield direction, creating direction-dependent optical properties that simultaneously achieve broad viewing coverage and minimize driver distraction
Solution Approach 2:
The patent changes the optical parameters of the display system by introducing a light control structure that dynamically or statically adjusts the emitting angle of light. By controlling the effective emitting angle θ to satisfy θ≤arctan(dz1/dx1), the system transforms the light distribution pattern to reduce reflection while maintaining adequate viewing area
2Reliability
If the display device restricts light emitting angle to reduce windshield reflection, then driver safety is improved, but the viewing area coverage is reduced
Solution Approach 1:
The patent segments the viewing space into different angular zones with different light emission characteristics. The light control structure divides the light emission into restricted zones (toward the windshield) and permitted zones (toward the rear), allowing the system to maintain driver safety while preserving viewing area through spatial segmentation of optical properties
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 light control structure effectively minimizes the reflection of light with excessive emitting angles, enhancing driver safety by reducing visual interference and maintaining clear visibility during vehicle operation.
Implementation Method 1
the large-angle light emitted by the display device in the car may be reflected by the windshield to the driver's eyes
Data Source
AI summary
A display device for a vehicle with a window includes a substrate, a light control structure disposed on the substrate and a plurality of light emitting units disposed between the substrate and the light control structure. The light emitting units emit a light passing through the light control structure. In a cross-sectional view, a viewing region is defined on the window, a first reference point at the window is out of the viewing region and corresponding to an upper side of the viewing region, a distance dx1 exists between the first reference point and the display device in a horizontal direction, a distance dz1 exists between the first reference point and a center of the display device in a vertical direction, the light control structure has an effective emitting angle θ, and the effective emitting angle θ satisfy the following equation: θ≤arctan(dz1/dx1).