Organic Light Emitting Display Device with Multi-Layered Organic Structure
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Solution Overview
Problem
Current organic light emitting display devices face limitations in achieving high resolution due to structural constraints, leading to increased power consumption, reduced lifespan, and reliability issues as the number of pixels per unit area increases, along with limitations in luminance and efficiency characteristics.
Innovation Solution
The organic light emitting display device incorporates a substrate with defined pixel regions, featuring a multi-layered organic layer structure including charge generating layers and light emitting layers of varying thicknesses, optimized for Micro Cavity effect to enhance light emission efficiency, and uses materials with high hole mobility in the light emitting layers to improve current efficiency and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels per unit area is increased to achieve high resolution, then display resolution is improved, but power consumption increases and lifespan reduces
Solution Approach 1:
The patent applies local quality by creating different thicknesses of light emitting layers in different pixel regions. Specifically, the first light emitting layer has a first thickness in a first pixel region and a second thickness in a second pixel region, where the first thickness is greater than the second thickness. This allows different regions to have optimized characteristics for their specific requirements, improving overall device performance while managing power consumption.
Solution Approach 2:
The patent changes physical parameters of the organic layer structure, specifically the thickness of light emitting layers and the introduction of charge generating layers. By adjusting the thickness parameter of light emitting layers in different regions and incorporating charge generating layers between unit organic layers, the device achieves improved current efficiency and reduced power consumption while maintaining high resolution.
2Measurement precision
If the number of pixels per unit area is increased to achieve high resolution, then display resolution is improved, but reliability reduces
Solution Approach 1:
The patent implements local quality by varying the thickness of light emitting layers across different pixel regions. The first light emitting layer has different thicknesses in different pixel regions, allowing optimization of reliability characteristics in high-stress regions while maintaining high resolution across the entire display.
Solution Approach 2:
The patent uses composite material structures by combining multiple unit organic layers with charge generating layers between them. This composite structure of organic layers and charge generating layers improves device reliability by better managing electrical stress and thermal characteristics in high-resolution displays.
3Ease of manufacture
If conventional organic light emitting display device structure is used, then manufacturing is simple, but current efficiency and luminance are limited
Solution Approach 1:
The patent applies segmentation by dividing the organic layer into multiple unit organic layers with different thicknesses. The light emitting layer is segmented into first and second light emitting layers with different thicknesses in different pixel regions, allowing optimization of luminance while maintaining manufacturability through systematic layer deposition.
Solution Approach 2:
The patent changes the thickness parameter of light emitting layers to optimize luminance. By setting the first thickness of the first light emitting layer to be greater than the second thickness in different pixel regions, the device achieves enhanced luminance characteristics while remaining compatible with existing manufacturing processes.
4Ease of manufacture
If uniform thickness light emitting layers are used, then manufacturing is easy, but current efficiency is limited
Solution Approach 1:
The patent implements local quality by creating non-uniform thickness in light emitting layers across different pixel regions. The first light emitting layer has a first thickness in a first pixel region and a second thickness in a second pixel region, optimizing current efficiency for different viewing conditions while maintaining reasonable manufacturing complexity.
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 approach results in improved current efficiency, extended lifespan, and enhanced reliability, allowing for high-resolution displays with reduced power consumption and increased luminance, while maintaining excellent performance at high temperatures.
Implementation Method 1
emits light when exciton obtained by combination of the injected electrons and holes is transited from an excited state to a ground state
Implementation Method 2
optimized for Micro Cavity effect to enhance light emission efficiency
Data Source
AI summary
Disclosed is an organic light emitting display device having excellent lifespan and current efficiency characteristics, as well as high luminance to provide increased resolution and improved reliability, and a method for manufacturing the same. The organic light emitting display device comprises a substrate having first, second, and third pixel regions; a first electrode arranged on the substrate; a second electrode arranged on the first electrode; and an organic layer arranged between the first electrode and the second electrode. The organic layer includes first, second and third organic layers on the first, second and third pixel regions, respectively. Each of the first, second and third organic layers includes a plurality unit organic layers and at least one charge generating layer arranged between the plurality of unit organic layers.