OLED Transmittance Control Layer for Privacy Viewing Angles
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Solution Overview
Problem
Existing organic light emitting display devices lack a mechanism to limit the viewing angle, which is necessary for privacy and safety, and the addition of light control films increases cost and thickness, hindering the development of lightweight and thin displays.
Innovation Solution
Incorporating a transmittance control layer with a black matrix and a gray pattern that includes a reflective layer, allowing for adjustable viewing angles by blocking and recycling light, thereby maintaining display thinness and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light control film is applied to limit viewing angle, then viewing angle limitation is achieved, but manufacturing cost increases and device thickness increases
Solution Approach 1:
The patent extracts the light control function from a separate film component and integrates it directly into the display device structure through the transmittance control layer. This eliminates the need for additional light control films while achieving the same viewing angle limitation effect, thereby reducing both cost and thickness.
Solution Approach 2:
The transmittance control layer combines multiple functions into a single integrated component: it serves as both the display structure element and the light control element. The lens-shaped transparent pattern and gray pattern are merged within this layer to achieve viewing angle limitation without requiring separate films.
2Object-affected harmful factors
If viewing angle is limited for privacy protection, then privacy and safety are enhanced, but display structure becomes more complex
Solution Approach 1:
The patent applies local quality by creating spatially varying transmittance properties within the transmittance control layer. The lens-shaped transparent pattern provides different optical properties in different regions, allowing light to pass through at certain angles while blocking it at others,从而实现 viewing angle limitation without requiring complex overall structure.
3Object-affected harmful factors
If transmittance control layer with gray pattern is used, then viewing angle is limited, but light emission efficiency may decrease
Solution Approach 1:
The patent utilizes parameter changes by varying the thickness of the gray pattern across different regions of the transmittance control layer. This thickness variation allows precise control of light transmittance at different angles, achieving viewing angle limitation while optimizing light emission efficiency through parameter optimization rather than simple blocking.
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 limits the viewing angle to enhance privacy and safety while maintaining display efficiency and reducing production costs, without the need for additional films.
Implementation Method 1
a transmittance control layer, light emitted from the first to third light emitting diodes being transmitted toward the transmittance control layer, the transmittance control layer including a lens-shaped transparent pattern and a gray pattern
Implementation Method 2
the transmittance control layer including a lens-shaped transparent pattern and a gray pattern
Data Source
AI summary
An organic light emitting display device includes a substrate including first to third sub-pixels; first to third light emitting diodes disposed on the substrate and respectively located in the first to third sub-pixels; and a transmittance control layer, light emitted from the first to third light emitting diodes being transmitted toward the transmittance control layer, the transmittance control layer including a lens-shaped transparent pattern and a gray pattern, wherein the gray pattern is located to cover the lens-shaped transparent pattern, and has different thicknesses according to a thick of the transparent pattern.