Vehicle Display Light Control Layer for Windshield Reflection
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Solution Overview
Problem
Light emitted from vehicle display devices can obstruct a driver's vision when reflected by the windshield, necessitating a solution to control the exit angle of light emission.
Innovation Solution
A display device with a light control layer featuring transmission portions and light blocking portions, where the thickness and width of the transmission portions are determined by the refractive index and exit angle of light, reducing the width of the light blocking portions to enhance light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light control film is used to limit the exit angle of light, then driver vision obstruction is prevented, but light transmittance is reduced
Solution Approach 1:
The light control layer is segmented into alternating transmission portions and light blocking portions. The transmission portions have thickness and width dimensions determined by a function of refractive index and exit angle, allowing light to pass through at specific angles, while the light blocking portions block light at other angles. This segmentation enables selective light control, preventing windshield reflection while maintaining adequate light transmittance for display visibility.
2Illumination intensity
If the width of light blocking portions is reduced to enhance light transmittance, then more light can pass through, but the light control effectiveness may be compromised
Solution Approach 1:
The thickness and width of the transmission portions are precisely controlled according to a function involving the refractive index of the transmission portions and the desired exit angle of light. By adjusting these dimensional parameters, the light control layer achieves optimal balance between light transmittance and exit angle control, ensuring that light blocking portions are sufficiently narrow to allow light through while remaining wide enough to effectively block light at unwanted angles.
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 display device achieves improved light transmittance and prevents image reflection on the windshield, thereby enhancing driver visibility.
Implementation Method 1
A thickness (T0) of each of the transmission portions and a width (S0) of each of the transmission portions in a cross-section are determined by a function of wherein n is a refractive index of the transmission portions, and 0 is an exit angle of a light emitted from the display panel and propagating through the light control layer.
Data Source
AI summary
A display device includes a display panel, an optical layer disposed on the display panel, a window disposed on the optical layer, and a light control layer. The light control layer is disposed between the display panel and the optical layer or between the optical layer and the window. The light control layer includes a plurality of transmission portions spaced apart from each other and a light blocking portion filled between the transmission portions. A thickness of each of the transmission portions and a width of each of the transmission portions in a cross-section are determined by a function of a refractive index of the transmission portions, and an exit angle of light emitted from the display panel and propagating through the light control layer.