OLED Display Panel Barrier Pillar and Water Absorbing Layer Design
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Solution Overview
Problem
OLED display panels face moisture intrusion due to the collapse and breakage of thin film encapsulation layers, particularly at edges with steep slopes, leading to reduced yield and effectiveness.
Innovation Solution
A display panel design incorporating barrier pillars and a water absorbing layer around an organic light emitting device, with a multilayer thin film encapsulation structure, where the water absorbing layer is positioned between or around the barrier pillars to absorb external moisture and support the encapsulation layer, using materials like calcium carbonate, acrylate, and epoxy resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If two circles of barrier pillars are disposed around the OLED device to prevent encapsulation layer extension, then the ineffective area around the OLED device is reduced, but the encapsulation film located on the left side of the barrier pillar is easily collapsed and broken due to large slope
Solution Approach 1:
A water absorbing layer is disposed between or around the two circles of barrier pillars before the encapsulation layer is formed. This preliminary action creates a supportive structure that prevents the encapsulation layer from collapsing and breaking due to large slope, while still allowing the barrier pillars to effectively limit the encapsulation layer extension and maximize the effective area of the display panel.
2Ease of manufacture
If the thin film encapsulation layer is formed with high ductility to avoid extension, then the encapsulation layer can conform to the barrier pillars, but the encapsulation film is easily collapsed and broken due to large slope
Solution Approach 1:
The water absorbing layer is disposed in advance between or around the barrier pillars to provide structural support before the encapsulation layer is formed. This preliminary support structure allows the encapsulation layer to be formed with high ductility to conform to the barrier pillars, while the water absorbing layer prevents collapse and breaking due to large slope, thereby maintaining structural strength.
3Device complexity
If the encapsulation layer is made thinner to reduce manufacturing complexity, then the manufacturing process is simplified, but the encapsulation layer becomes more prone to breaking at steep slopes
Solution Approach 1:
The water absorbing layer is disposed in advance between or around the barrier pillars to provide preliminary structural support. This allows the encapsulation layer to be made thinner to reduce manufacturing complexity, while the water absorbing layer compensates for the reduced thickness by providing additional support that prevents breakage at steep slopes, thereby maintaining reliability.
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 solution effectively prevents moisture intrusion and improves the yield of OLED display panels by absorbing external water vapor when the encapsulation layer breaks, reducing the likelihood of damage and enhancing panel reliability.
Implementation Method 1
a water absorbing layer, wherein the water absorbing layer is disposed on the substrate, and the water absorbing layer is disposed around the plurality of barrier pillars
Data Source
AI summary
Provided are a display panel and a display device. The display panel includes a substrate; an organic light emitting element, disposed on the substrate; a plurality of barrier pillars, wherein the plurality of barrier pillars are disposed on the substrate, and the plurality of barrier pillars are disposed around the organic light emitting device; a water absorbing layer, wherein the water absorbing layer is disposed on the substrate, and the water absorbing layer is disposed around the plurality of barrier pillars; and a thin film encapsulation layer, disposed on the organic light emitting device, the substrate, the plurality of barrier pillars and the water absorbing layer.