Vehicle Light-Emitting Display with Angle-Blocking Patterns
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Solution Overview
Problem
Conventional light emitting display devices in vehicles suffer from light emission that interferes with driver visibility, particularly at night when light is reflected from the windshield, due to the lack of effective light blocking mechanisms.
Innovation Solution
A light emitting display device with integrated light blocking patterns on the front surface of the light emitting layer, featuring a trapezoidal shape in cross-section, where the first portion has a lower etching rate and the second portion is made of transparent organic material, ensuring light is not emitted at angles greater than 45 degrees, thereby preventing reflection on the windshield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If light blocking patterns are added to block light emission at specific angles, then driver visibility is improved and windshield reflection is prevented, but device structure becomes more complex
Solution Approach 1:
The patent combines the light blocking pattern layer with the pixel defining layer, integrating two functional layers into one structure. The light blocking patterns are formed within the pixel defining layer using the same manufacturing process, eliminating the need for a separate light blocking layer and reducing overall device complexity while maintaining effective light blocking at specific angles.
Solution Approach 2:
The pixel defining layer is given multiple functions: it defines pixel boundaries and simultaneously provides light blocking patterns for controlling light emission angles. This multi-functional design prevents windshield reflection and protects driver visibility without adding extra dedicated components, thus resolving the contradiction between functionality and structural complexity.
2Object-affected harmful factors
If light blocking patterns are formed with complex multi-layer structure, then light blocking performance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The light blocking patterns are formed with varying local properties within the pixel defining layer. By controlling the etching rate at different locations and depths, the patent creates patterns with specific light blocking characteristics that prevent windshield reflection while maintaining manageable manufacturing precision requirements through localized material property variations.
3Object-affected harmful factors
If more light blocking layers are added, then light blocking effectiveness is improved, but transmittance of useful light is reduced
Solution Approach 1:
The patent uses light blocking patterns with specific optical properties that selectively block light at certain angles while maintaining transmittance for useful light directions. The patterns are designed to control the angular distribution of emitted light, blocking reflected light paths to the windshield while preserving forward light transmission to the driver, thus resolving the contradiction between blocking effectiveness and transmittance.
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 blocks light emission at specific angles, reducing glare and improving driver visibility at night by ensuring light is not reflected from the windshield, while maintaining high transmittance and reducing manufacturing costs.
Implementation Method 1
a plurality of light blocking patterns that are disposed on the pixel defining layer and the plurality of light emitting layers, and extend in a first direction. Each of the plurality of light blocking patterns includes a first portion and a second portion formed on the first portion and having a width decreasing toward an upper portion thereof
Implementation Method 2
a plurality of light emitting diodes that are disposed above the substrate and include a plurality of light emitting layers
Implementation Method 3
Each of the plurality of light emitting diodes may have a viewing angle so that light emitted from the each of the plurality of light emitting diodes is not emitted at an angle greater than or equal to the viewing angle with respect to a normal line
Data Source
AI summary
A light emitting display device and a car including the same according to embodiments include: a substrate; a plurality of light emitting diodes that are disposed above the substrate and include a plurality of light emitting layers; a pixel defining layer that has openings corresponding to the plurality of light emitting layers; and a plurality of light blocking patterns that are disposed on the pixel defining layer and the plurality of light emitting layers, and extend in a first direction. Each of the plurality of light blocking patterns includes a first portion and a second portion formed on the first portion and having a width decreasing toward an upper portion thereof.