OLED Discharging Hole for Gas Management
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Solution Overview
Problem
Organic light emitting display devices face pixel shrinkage due to gases emitted from organic layers, which affects the device's performance and longevity.
Innovation Solution
Incorporating a discharging hole that extends through the common layer and potentially into the spacer and pixel defining layer, allowing gases to be discharged, thereby reducing or preventing pixel shrinkage. This is achieved through a laser drilling process that controls the depth and width of the discharging hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic layers (planarization layer, pixel defining layer, spacer) are used in the display device, then the device structure is protected and planarized, but gases are discharged from these organic layers causing pixel shrinkage
Solution Approach 1:
The patent introduces discharging holes that extend through the common layer to allow gases to escape from the organic layers. By providing a controlled discharge path, the harmful gas accumulation that causes pixel shrinkage is converted into a managed discharge process, protecting the pixel structure while maintaining the protective function of the organic layers
Solution Approach 2:
The patent segments the common layer by creating discharging holes that extend through it, allowing the layer to be divided into regions with different gas permeability. This segmentation enables selective gas discharge while maintaining the overall protective and planarization functions of the organic layers
2Object-affected harmful factors
If the discharging hole extends deeper into the spacer and pixel defining layer, then gas discharge effectiveness is improved, but the manufacturing complexity and precision requirements increase
Solution Approach 1:
The patent applies local quality by creating discharging holes with specific depth characteristics - extending through the common layer and selectively into the spacer or pixel defining layer based on local requirements. This allows optimized gas discharge at different depths without requiring uniform deep holes throughout, balancing effectiveness with manufacturing feasibility
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 discharging hole effectively reduces gas infiltration into the organic light emitting diode, delaying or preventing pixel shrinkage, thus maintaining the display's performance and extending its lifespan.
Implementation Method 1
the discharging hole may be formed by a laser drilling process which irradiates the common layer with a laser beam
Data Source
AI summary
An organic light emitting display device may include a base substrate including an emission area at which light is emitted and a peripheral area which is adjacent to the emission area; an encapsulation substrate disposed on the base substrate; a common layer between the base substrate and the encapsulation substrate, the common layer disposed in both the emission area and the peripheral area; between the base substrate and the common layer, each of: a planarization layer; a pixel electrode in the emission area; and a pixel defining layer; and a discharging hole disposed corresponding to the pixel defining layer, the discharging hole extending through the common layer.