OLED Sealant Adhesion via Fill-Up Layer Planarization
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Solution Overview
Problem
The adhesion of the sealant in OLED displays deteriorates due to step differences caused by testing/aging wires, leading to potential separation of the sealing member from the display substrate, which compromises the strength and reliability of the OLED display.
Innovation Solution
The implementation of a fill-up layer, formed from the same material as the semiconductor layer or planarization layer, is disposed under or over the contact region of the conductive wire, which supplements the insulating layer and maintains a flat surface for the second conductive wire and sealant, preventing adherence issues and enhancing the structural integrity of the OLED display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If testing/aging wires are formed along edges of OLED display, then image quality test and aging process can be performed, but step difference is generated that deteriorates sealant adhesion
Solution Approach 1:
A fill-up layer is introduced as an intermediary structure between the testing/aging wires and the sealant. This fill-up layer fills the step difference created by the wires, providing a flat surface for the sealant and maintaining adhesion while preserving the testing functionality.
Solution Approach 2:
The fill-up layer is applied locally only at the edge regions where testing/aging wires are present, rather than across the entire display. This localized approach addresses the adhesion problem at specific problem areas while maintaining the overall structure and functionality of the OLED display.
2Reliability
If sealant is coated along edge of sealing member, then display substrate can be sealed with sealing member, but sealant may separate from display substrate due to step difference
Solution Approach 1:
The fill-up layer serves as a mediator between the uneven wire structure and the sealant coating process. By providing a flat intermediate surface, it enables proper sealant adhesion and prevents separation while maintaining the sealing function.
Solution Approach 2:
The fill-up layer is formed in advance before the sealant is coated. This preliminary action creates a flat surface that prevents adhesion deterioration during the subsequent sealant coating process, ensuring proper sealing.
3Reliability
If insulating layer is formed over conductive wire, then electrical insulation is provided, but step difference deteriorates sealant adhesion
Solution Approach 1:
The fill-up layer acts as an intermediary that compensates for the step difference created by the insulating layer over the conductive wire. It provides a flat surface for the sealant while preserving the electrical insulation function of the insulating layer.
Data Source
AI summary
An organic light emitting diode (OLED) display. The OLED display includes a first substrate member, a first conductive wire having a contact region and formed over the first substrate member, an insulating layer including a plurality of wire contact holes exposing a part of the contact region of the first conductive wire and formed over the first conductive wire, a second conductive wire formed over the first conductive wire and connected to the first conductive wire through the plurality of wire contact holes of the insulating layer, a sealant formed over the second conductive wire, a sealing member formed over the sealant, and a fill-up layer disposed above or under the contact region of the first conductive wire.