OLED Dummy Pixel Defining Layer Adhesion to Prevent Short Circuits
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Solution Overview
Problem
In OLED display devices, the use of hydrophobic materials in pixel defining layers can lead to reduced adherence with other layers, causing separation issues and potential short-circuits due to the hydrophobic nature of these materials, particularly when combined with insulating layers.
Innovation Solution
The implementation of a display device structure that includes a first adhesive auxiliary layer made of an inorganic insulating material and a second adhesive auxiliary layer, both positioned strategically to enhance adherence between the pixel defining layer and other components, preventing lifting and short-circuiting by ensuring proper planarization and alignment of the hydrophobic dummy pixel defining layer with the second adhesive auxiliary layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pixel defining layer includes hydrophobic material to prevent droplet flow, then droplet containment is improved, but adherence with other layers deteriorates causing separation
Solution Approach 1:
An adhesive auxiliary layer is introduced between the pixel defining layer and the insulating layer to serve as a mediator. This intermediate layer has good adhesion to both the hydrophobic pixel defining layer and the insulating layer, thereby maintaining droplet containment while preventing separation caused by poor adherence.
Solution Approach 2:
The adhesive auxiliary layer is formed using a composite structure of multiple materials with different properties. The layer combines materials that provide both adhesive strength to the insulating layer and compatibility with the hydrophobic pixel defining layer, resolving the contradiction between containment and adherence.
2Manufacturing precision
If the pixel defining layer uses hydrophobic material, then droplet discharge control is improved, but structural integrity deteriorates due to layer separation
Solution Approach 1:
The adhesive auxiliary layer acts as a stabilizing intermediary that maintains structural integrity between the hydrophobic pixel defining layer and the insulating layer. This prevents layer separation and maintains the stability of the overall device composition while preserving precise droplet discharge control.
Solution Approach 2:
The adhesive auxiliary layer is positioned beforehand to cushion and prevent the harmful effect of layer separation. By anticipating the adhesion problem caused by hydrophobic materials, the auxiliary layer pre-establishes a bonding interface that maintains structural integrity throughout the device operation.
3Manufacturing precision
If hydrophobic material is used in pixel defining layer, then emission layer formation is improved, but short-circuit risk increases due to layer separation
Solution Approach 1:
The adhesive auxiliary layer serves as a protective intermediary that prevents direct contact between conductive layers that might occur due to separation. By maintaining proper spacing and adhesion between the pixel defining layer and insulating layer, it prevents short-circuits while allowing precise emission layer formation through the inkjet process.
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 configuration effectively prevents the pixel defining layer from lifting and the metal layer on the pixel defining layer from being short-circuited, thereby enhancing the structural integrity and operational reliability of the OLED display device.
Implementation Method 1
a first adhesive auxiliary layer made of an inorganic insulating material and a second adhesive auxiliary layer, both positioned strategically to enhance adherence between the pixel defining layer and other components
Data Source
AI summary
A display device according to an embodiment includes: a substrate including a display area, a dummy area, and a peripheral area; a passivation layer positioned in the display area, the dummy region, and the peripheral area of the substrate; a first adhesive auxiliary layer positioned on the passivation layer and positioned in the dummy region; a dummy pixel defining layer positioned on the first adhesive auxiliary layer and including a hydrophobic material; a second adhesive auxiliary layer positioned on the passivation layer, positioned in the peripheral area, and including a lateral side contacting the dummy pixel defining layer; a common voltage transmitter positioned in the peripheral area; and a common electrode connected to the common voltage transmitter, and positioned on the second adhesive auxiliary layer and the dummy pixel defining layer.