AMOLED Anti-Reflection Stack for Thin Foldable Display Panels
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Solution Overview
Problem
Existing AMOLED display panels suffer from high reflectivity due to silver anodes, leading to visibility issues from external ambient light, and the use of thick polarizers compromises flexibility and folding ability.
Innovation Solution
Incorporating an anti-reflection structure with alternating layers of transparent dielectric and metal layers between the display device and the touch-control electrode layer, reducing the need for a circular polarizer and enhancing anti-reflection performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a circular polarizer is added to offset external ambient light, then visibility is improved, but the panel thickness increases and flexibility deteriorates
Solution Approach 1:
The patent changes the optical parameters by using a multi-layer dielectric structure with specific refractive indices and thicknesses to achieve anti-reflection functionality, replacing the traditional circular polarizer approach. This reduces the overall optical stack thickness while maintaining visibility performance.
Solution Approach 2:
The patent employs a composite multi-layer structure consisting of alternating high and low refractive index dielectric layers. This composite material approach enables effective anti-reflection performance through constructive and destructive interference of light waves, achieving the same visibility improvement as circular polarizers but with reduced thickness.
2Illumination intensity
If a circular polarizer is added to offset external ambient light, then contrast is improved, but repeated folding ability deteriorates
Solution Approach 1:
The patent modifies the optical stack parameters by implementing a thin-film multi-layer dielectric structure that provides anti-reflection functionality without the bulk thickness of circular polarizers. This enables flexible displays to maintain contrast performance while withstanding repeated folding cycles.
Solution Approach 2:
The patent uses thin-film dielectric layers that are inherently flexible and adaptable to bending. These thin films replace the rigid circular polarizer structure, enabling the display to maintain contrast enhancement while preserving repeated folding ability and mechanical reliability.
3Use of energy by moving object
If silver is used as anode material to improve light extraction efficiency, then light extraction efficiency is improved, but reflectivity of external ambient light increases
Solution Approach 1:
The patent segments the optical management function into two distinct components: the silver anode handles light extraction from the OLED layer, while the multi-layer dielectric anti-reflection coating handles external ambient light reflection. This segmentation allows each component to optimize its specific function without compromising the other.
Solution Approach 2:
The patent introduces the multi-layer dielectric structure as an intermediary layer between the silver anode and the external environment. This intermediary maintains the high light extraction efficiency of the silver anode while simultaneously providing anti-reflection functionality to reduce ambient light interference.
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 anti-reflection structure significantly reduces glare from ambient light reflection, decreases panel thickness, and improves bending resistance, maintaining visibility and flexibility.
Implementation Method 1
The reflectivity of silver in a visible light band is 90% or above, which is very prone to reflect external ambient light
Implementation Method 2
an anti-reflection structure between the display device and the touch-control electrode layer, wherein the anti-reflection structure includes at least two transparent dielectric layers and at least one metal layer which are arranged in an alternating and stacked manner
Data Source
AI summary
A display apparatus and a manufacturing method therefor. The display apparatus comprises: a substrate; a display device, which is located on the substrate; a touch-control electrode layer, which is located on the side of the display device that faces away from the substrate; and an anti-reflection structure, which is located between the display device and the touch-control electrode layer, wherein the anti-reflection structure comprises transparent dielectric layers and a metal layer, which are arranged in an alternating and stacked manner, the metal layer being located between the transparent dielectric layers, there being at least two transparent dielectric layers, and there being at least one metal layer.