OLED Blocking Walls for Water Oxygen Barrier
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Solution Overview
Problem
Current display panel packaging structures fail to effectively block water and oxygen, leading to corrosion of organic light emitting devices and low yield in OLEDs.
Innovation Solution
Incorporation of inorganic blocking walls between light emitting device units and pixel defining bodies, made from silicon nitride, to prevent water and oxygen infiltration, with the blocking walls contacting the planarization and anode layers and extending to cover side surfaces of pixel defining bodies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an inorganic/organic multiple alternating film structure is used for packaging, then the structure can relieve stress between adjacent inorganic layers, but the water and oxygen blocking performance is insufficient
Solution Approach 1:
The packaging structure is segmented into multiple functional layers: inorganic blocking layers for water/oxygen barrier, organic stress-relief layers, and pixel defining bodies with blocking walls. This segmentation allows each layer to specialize in its function, improving overall performance.
Solution Approach 2:
The patent uses composite packaging structures combining inorganic materials (for blocking) and organic materials (for stress relief). The pixel defining bodies also use composite structures with side walls and blocking walls made of different materials to achieve both mechanical stability and barrier functionality.
2Ease of manufacture
If the pixel defining bodies are used to define pixel regions, then the light emitting device units are structured, but water and oxygen can still diffuse horizontally between units
Solution Approach 1:
The blocking walls extend vertically from the substrate upward along the side surfaces of pixel defining bodies, adding a vertical barrier dimension to the horizontal pixel definition. This multi-dimensional approach prevents water and oxygen diffusion while maintaining pixel structure.
Solution Approach 2:
The blocking walls act as intermediary structures between adjacent pixel defining bodies, creating a barrier that prevents direct contact and diffusion of water and oxygen between neighboring light emitting device units.
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
Enhances water-oxygen resistance by blocking diffusion in a horizontal direction, thereby improving the longevity and reliability of OLEDs.
Implementation Method 1
a plurality of blocking walls, each being disposed between the neighboring light emitting device units for blocking water and oxygen
Data Source
AI summary
A display panel and a display device are provided. The display panel has an array substrate, a planarization layer, an anode layer, a light emitting device layer having light emitting device units, a plurality of pixel defining bodies, and a plurality of blocking walls disposed between the neighboring light emitting device units for blocking water and oxygen. Each of the blocking walls contacts with at least one of the planarization layer and the anode layer, and an upper surface of one of the blocking walls is not lower than an upper surface of one of the pixel defining bodies.