High-Refractive Index Polysilicon Layer for Blue OLED Luminance
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Solution Overview
Problem
Current organic light-emitting display apparatuses face challenges in enhancing blue light emission properties, particularly in terms of luminance and color reproducibility, due to limitations in the structural design and materials used in the blue sub-pixel region.
Innovation Solution
The introduction of a high-refractive index layer with a refractive index greater than the DBR layer, formed of polysilicon, is positioned between the substrate and the DBR layer in the blue sub-pixel region, along with an auxiliary silicon oxide layer, to improve light efficiency and color purity by optimizing the resonance effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional DBR layer structure is used in the blue sub-pixel region, then the device structure remains simple, but the luminance and color reproducibility of blue light emission are insufficient
Solution Approach 1:
The patent applies local quality by introducing a high-refractive index layer specifically in the blue sub-pixel region, while other regions (red and green sub-pixels) maintain the conventional DBR structure. This localized modification optimizes blue light emission properties without unnecessarily complicating the entire device structure. The high-refractive index layer is positioned between the substrate and the DBR layer in the blue sub-pixel region, creating a resonant cavity that enhances luminance and color reproducibility specifically for blue emission.
Solution Approach 2:
The patent employs composite materials by combining the high-refractive index layer (made of polysilicon) with the conventional DBR layer structure (alternating layers of silicon oxide and silicon nitride). This composite structure creates a resonant cavity that improves optical properties. The combination of different materials with varying refractive indices enables enhanced light emission efficiency and color purity for the blue sub-pixel region.
2Manufacturing precision
If the DBR layer is used without a high-refractive index layer, then the manufacturing process remains simple, but the color purity and emission efficiency of blue light are limited
Solution Approach 1:
The patent applies preliminary action by forming the high-refractive index layer before depositing the DBR layer in the blue sub-pixel region. This sequence ensures that the resonant cavity is established beforehand, allowing the subsequent DBR layers to be deposited with precise thickness control for optimal optical performance. The preliminary formation of the high-refractive index layer facilitates better color reproducibility without significantly complicating the overall manufacturing process.
3Illumination intensity
If a high-refractive index layer is added to improve blue light emission, then luminance and color reproducibility improve, but the device structure becomes more complex
Solution Approach 1:
The patent applies local quality by introducing the high-refractive index layer specifically in the blue sub-pixel region, while red and green sub-pixels maintain the conventional DBR structure without additional layers. This localized approach enhances blue light emission properties (luminance and color reproducibility) without unnecessarily increasing the complexity of the entire display device structure. The selective application minimizes the overall structural complexity increase.
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 the luminance and color reproducibility of blue light emission, reducing the Moiré phenomenon and improving overall emission properties in organic light-emitting display apparatuses.
Implementation Method 1
to improve light efficiency and color purity by optimizing the resonance effect
Implementation Method 2
The DBR layer may be formed by alternately stacking a first layer and a second layer that have different refractive indices
Data Source
AI summary
A method of manufacturing an organic light-emitting display includes a first mask process forming an active layer of a TFT and a refractive layer on a substrate, forming a DBR layer covering the active and refractive layers, a second mask process forming a gate electrode and a first electrode unit on the DBR layer, forming an interlayer insulation layer covering the gate electrode and the first electrode unit, a third mask process forming contact holes in the interlayer insulation layer and the DBR layer exposing portions of the active layer and a hole exposing the first electrode unit, a fourth mask process forming source and drain electrodes on the interlayer insulation layer that contact the active layer via the contact holes, and forming a pixel electrode from the first electrode unit, and a fifth mask process forming a pixel definition layer exposing the pixel electrode.