Display Optical Stack for Vehicle Glare Angle Control
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Solution Overview
Problem
Light emitted by display devices, particularly in vehicles, can be directed in specific directions that may hinder driver attention or visibility due to reflection on vehicle glass surfaces, posing safety risks.
Innovation Solution
A display device design featuring light blocking patterns with varying refractive indices and configurations to control light emission angles, including integral light blocking patterns and a metal layer to prevent light from being directed in specific directions, thereby reducing reflection on vehicle glass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If light blocking patterns are added to control light emission angles, then light direction control is improved, but device complexity increases
Solution Approach 1:
The light blocking structure is segmented into multiple layers: a first layer with light blocking patterns having a first refractive index, and a second layer with light blocking patterns having a second refractive index. Each layer is positioned at different heights above the substrate, creating a multi-level light control system that achieves precise angular control without requiring a single complex structure
Solution Approach 2:
Different regions of the light blocking patterns have different refractive indices tailored to their specific functions. The first layer patterns have refractive indices optimized for blocking light at certain angles, while the second layer patterns have refractive indices optimized for blocking light at other angles. This local optimization of optical properties enables effective light direction control through a relatively simple layered structure
2Object-affected harmful factors
If multiple layers with different refractive indices are used to control light reflection, then light direction control is improved, but manufacturing complexity increases
Solution Approach 1:
The invention controls light reflection by changing the refractive index parameter across different layers and regions. The first layer uses materials with a first refractive index range, while the second layer uses materials with a second refractive index range. This parameter-based differentiation allows each layer to target specific reflection angles, achieving comprehensive light direction control through standard manufacturing processes for multi-layer structures
3Stability of the object's composition
If light blocking patterns extend across multiple light emitting diodes, then uniform light blocking is improved, but transmittance decreases
Solution Approach 1:
The light blocking patterns are arranged in the vertical dimension with the first layer positioned at a first height and the second layer positioned at a second height above the substrate. This vertical stacking creates a three-dimensional light blocking architecture that achieves uniform angular control across multiple LEDs while maintaining higher light transmittance compared to extensive two-dimensional patterns, as the layered structure allows light to pass through gaps between layers at non-blocking 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 solution effectively prevents light from being directed towards the driver's eyes, maintaining visibility and attention by minimizing glare and reflection, while offering advantages such as uniform light blocking, reduced manufacturing costs, and high transmittance.
Implementation Method 1
A refractive index of the first layer is greater than a refractive index of the second layer. At least part of the light generated by the light emitting diode is totally reflected on an interface of the first layer and the second layer.
Data Source
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AI summary
A display device includes, a light emitting diode (LED) disposed on a substrate (110), and including an emission layer (EMLr, ELMg,EMLb), an encapsulation layer (400) disposed on the light emitting diode, a first layer (502) disposed on the encapsulation layer and including an opening (OP1, OP2), a light blocking pattern (BL, 503, 504) disposed in the opening and extending in a first direction (DR1), and a second layer (510) disposed on the first layer and the light blocking pattern. A refractive index of the first layer and a refractive index of the second layer are different from each other.