Display Device Light-Blocking Patterns for Viewing Angle Control
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Solution Overview
Problem
Display devices struggle to effectively limit the viewing angle of images for security and privacy purposes while maintaining image quality.
Innovation Solution
A display device design incorporating light-blocking patterns with tapered sides and different refractive indices in organic layers, along with metal or metal oxide materials, to control the viewing angle by creating trenches and slit patterns that restrict the emission of light beyond a specific angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light-blocking patterns are added to limit viewing angle, then security and privacy are improved, but device complexity increases
Solution Approach 1:
The light-blocking element is segmented into multiple light-blocking patterns (first light-blocking pattern and second light-blocking pattern) arranged in different directions. Each pattern is formed in a separate organic layer (first organic layer and second organic layer), dividing the complex light-blocking function into manageable segments that can be manufactured independently and then combined to achieve the desired viewing angle limitation.
Solution Approach 2:
The solution transitions from a single-layer light-blocking approach to a multi-layer structure where light-blocking patterns are distributed across different vertical layers (first organic layer and second organic layer). This dimensional arrangement allows light to be blocked from multiple directions simultaneously, effectively limiting viewing angle while maintaining a systematic manufacturing process.
2Reliability
If multiple organic layers with different refractive indices are used to control light emission, then viewing angle limitation is improved, but manufacturing complexity increases
Solution Approach 1:
Different organic layers are assigned different refractive indices tailored to their specific functions. The first organic layer has a refractive index optimized for blocking light in one direction, while the second organic layer has a refractive index optimized for blocking light in another direction. This local optimization of material properties allows each layer to perform its light-blocking function efficiently without requiring complex manufacturing processes.
Solution Approach 2:
The refractive index parameter is deliberately changed between different organic layers to achieve directional light control. By selecting organic materials with specific refractive indices for each layer, the patent controls the path and emission angle of light passing through the display device, enabling viewing angle limitation through material parameter selection rather than complex structural design.
3Reliability
If light-blocking patterns with tapered sides are formed, then light emission control is improved, but manufacturing precision requirements increase
Solution Approach 1:
The organic layers are formed with predetermined refractive indices and thicknesses before the light-blocking patterns are created. This preliminary preparation ensures that when the light-blocking patterns with tapered sides are formed, the surrounding organic material is already optimized to work with the tapered geometry, reducing the precision requirements for pattern formation while maintaining effective light emission control.
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 narrows the viewing angle of the displayed image, enhancing security and privacy while maintaining image quality and emission efficiency.
Implementation Method 1
a first light-blocking pattern protruding from an upper surface of the etch protection layer, and including a first light-blocking material, an organic layer covering the first light-blocking pattern, and defining a trench exposing an upper surface of the first light-blocking pattern, and a second light-blocking pattern in the trench, including a second light-blocking material
Implementation Method 2
A refractive index of the first organic layer may be different from a refractive index of the second organic layer
Data Source
AI summary
A display device includes a light-emitting element, an encapsulation layer covering the light-emitting element, an etch protection layer on the encapsulation layer, a first light-blocking pattern protruding from an upper surface of the etch protection layer, and including a first light-blocking material, an organic layer covering the first light-blocking pattern, and defining a trench exposing an upper surface of the first light-blocking pattern, and a second light-blocking pattern in the trench, including a second light-blocking material, and defining an inner space surrounded by the second light-blocking material.