Light Scattering Layer for OLED Luminance and Viewing Angle
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Solution Overview
Problem
Current methods for manufacturing large active matrix organic light-emitting displays (AM-OLEDs) face challenges with precision control and material characteristics, leading to issues with luminance, viewing angle, and light-leaking phenomena due to limitations in deposition techniques and material properties.
Innovation Solution
The proposed solution involves an organic light-emitting display apparatus with a substrate, color filters, an overcoat layer, passivation layers, a light scattering layer made of high refractive metal oxides, and electrodes, optimized to improve luminance, viewing angle, and prevent light-leaking by precise layer formation and material selection, including silicon oxide and nitride compositions, and the use of niobium pentoxide, zinc oxide, or indium gallium zinc oxide for the light scattering layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light scattering layer is added to improve viewing angle and luminance characteristics, then the device complexity increases
Solution Approach 1:
The patent divides the display structure into multiple functional layers, including a dedicated light scattering layer positioned between the color filter and the organic light-emitting layer. This segmentation allows each layer to perform its specific function optimally, with the light scattering layer specifically responsible for improving viewing angle and luminance characteristics without affecting other layers.
Solution Approach 2:
The light scattering layer acts as an intermediary element between the color filter layer and the organic light-emitting layer. It mediates the light path by scattering light in multiple directions, which improves viewing angle and luminance characteristics while maintaining the functional integrity of adjacent layers.
2Reliability
If multiple layers are added to improve luminance and prevent light-leaking, then manufacturing precision requirements increase
Solution Approach 1:
The patent incorporates a light scattering layer and multiple passivation layers during the manufacturing process to proactively prevent light-leaking phenomena before they occur. The light scattering layer is positioned and configured in advance to scatter potential leak light, while passivation layers are applied to encapsulate and seal the structure, preventing light leakage at interfaces.
Solution Approach 2:
The patent uses multiple passivation layers and a light scattering layer as protective measures applied beforehand to cushion against potential light-leaking issues. These layers create barriers and scattering paths that preemptively address light leakage problems that might arise from interface defects or structural imperfections.
3Reliability
If deposition methods are used to form RGB emissive layers, then material characteristics improve, but process complexity and precision control become difficult
Solution Approach 1:
The patent segments the color formation process by using a white organic light-emitting layer combined with a color filter layer, rather than using separate RGB emissive layers deposited by complex deposition methods. This segmentation simplifies the manufacturing process while maintaining color quality, as the white layer can be formed by simpler methods and the color filter provides the necessary color differentiation.
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
This configuration enhances luminance characteristics, light utility efficiency, and viewing angle while preventing light-leaking, thereby improving the overall performance and reliability of the AM-OLEDs.
Implementation Method 1
a light scattering layer formed on the first passivation layer
Implementation Method 2
The OLED emits light due to holes injected from the anode and electrons injected from the cathode recombining in the organic light-emitting layer
Implementation Method 3
The WOLED-CF method uses the color filter for color patterning
Data Source
AI summary
In an aspect, an organic light-emitting display apparatus including: a substrate; at least one color filter formed on the substrate; an overcoat layer covering the at least one color filter; a first passivation layer formed on the overcoat layer; a light scattering layer formed on the first passivation layer; a first electrode formed on the light scattering layer; a second electrode facing the first electrode; and an organic layer located between the first and second electrodes is provided.