OLED Display Substrate Diversion Channel for Encapsulation Flatness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The encapsulation performance of existing OLED display devices is inadequate due to poor surface flatness of the organic encapsulation thin film, leading to defects like pits and orange peel-like defects, which affect the production yield and service life of OLED display devices.
Innovation Solution
A display substrate with a diversion channel on its surface, which allows the encapsulation material to level out and fill the channel, ensuring uniform thickness and improved flatness of the encapsulation layer, thereby enhancing the encapsulation performance and preventing moisture and oxygen ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a thin film encapsulation layer is formed on the light-emitting unit to isolate it from moisture and oxygen, then the service life of the OLED display device is improved, but the encapsulation performance deteriorates due to poor surface flatness causing defects like pits and orange peel-like defects
Solution Approach 1:
The diversion channel is formed in advance on the pixel definition layer before the encapsulation layer is applied. This preliminary structural preparation allows the encapsulation material to flow and level out properly, preventing surface defects while maintaining the protective encapsulation function that extends device service life
Solution Approach 2:
The diversion channel acts as an intermediary structure between the pixel definition layer and the encapsulation layer. It mediates the flow of encapsulation material, enabling uniform distribution and flat surface formation, thereby resolving the contradiction between achieving good encapsulation performance and maintaining long service life
2Object-affected harmful factors
If the encapsulation layer is formed to cover the light-emitting unit, then protection against moisture and oxygen is achieved, but surface flatness deteriorates leading to pits and orange peel-like defects
Solution Approach 1:
The diversion channel is created beforehand on the pixel definition layer surface. This preliminary action establishes a flow path that guides the encapsulation material to level out uniformly, ensuring both adequate coverage for protection and high surface flatness to prevent manufacturing defects
Solution Approach 2:
The diversion channel utilizes fluid dynamics principles to allow the encapsulation material to flow and self-level. By providing a controlled flow path, the material distributes evenly across the surface, achieving both comprehensive protection and high manufacturing precision in terms of surface flatness
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 diversion channel ensures a high-flatness encapsulation layer, improving production yield and reducing defects, thus extending the service life of OLED display devices by effectively preventing moisture and oxygen from affecting the organic light-emitting material layer.
Implementation Method 1
the encapsulation material levels out on the side of the pixel definition layer that is away from the base via the diversion channel
Data Source
AI summary
A display substrate, a method for manufacturing the same and a display device are provided. The display substrate includes a base, a pixel definition layer disposed on the base, and a light-emitting unit disposed in a pixel opening region defined by the pixel definition layer; the display substrate further includes: a diversion channel provided on a surface of the pixel definition layer that is away from the base; and an encapsulation layer covering the light-emitting unit and the pixel definition layer, wherein the encapsulation layer fills the diversion channel. The display substrate in the present disclosure is used for displaying an image.