Organic Light-Emitting Display Device with Varying Organic Layer Sizes
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Solution Overview
Problem
Organic light-emitting display devices face reduced lifespan due to deterioration of organic layers, particularly those emitting blue light, which deteriorate faster than those emitting red or green light, and this is exacerbated by high electric current density.
Innovation Solution
The organic light-emitting display device is designed with varying sizes of organic layers based on the color of light emitted, with blue-emitting layers being larger and wider to reduce current density and extend lifespan, and the wiring lines are arranged in a zigzag pattern to improve aperture ratio and reduce current density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the size of organic layers is increased to reduce current density and extend lifespan, then the lifespan and reliability are improved, but the aperture ratio deteriorates
Solution Approach 1:
The patent applies local quality by making each organic layer have a different size according to its specific needs. Blue-emitting organic layers are made larger than red or green layers because blue layers deteriorate faster and require lower current density. This localized differentiation allows each layer to operate at optimal current density while maintaining overall device performance and aperture ratio.
2Duration of action of stationary object
If blue-emitting organic layers are made larger to reduce current density, then the deterioration is reduced and lifespan is extended, but the device complexity increases
Solution Approach 1:
The patent implements local quality by differentiating the size of organic layers based on their emission color and deterioration characteristics. Blue-emitting layers are designed with larger areas to reduce current density and extend lifespan, while red and green layers maintain standard sizes. This targeted approach extends device lifespan without requiring complete redesign of the entire structure.
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 design extends the lifespan of the organic light-emitting display device by reducing the deterioration of blue-emitting layers and enhancing the aperture ratio, ensuring consistent performance across different color emissions.
Implementation Method 1
The organic layer may emit light at a luminance level corresponding to an electric current flowing between the first electrode and the second electrode
Data Source
AI summary
An organic light-emitting display device comprising a substrate; an insulating layer disposed on the substrate; a plurality of bottom electrodes arranged on the insulating layer in a matrix pattern defining a plurality of intersecting rows and columns; an organic layer disposed on each of the bottom electrodes; a top electrode disposed on the organic layer; and a plurality of wiring lines adjacent to the first bottom electrode, the wiring lines being formed on the insulating layer placed between the rows of the bottom electrodes.