Display Grooves and Voltage Line Exposure for Moisture Protection
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Solution Overview
Problem
Organic light-emitting display apparatuses are susceptible to degradation due to moisture and oxygen infiltration, which compromises their performance and longevity.
Innovation Solution
A method of manufacturing a display apparatus that includes forming grooves around through holes in the substrate to prevent moisture and oxygen infiltration, using a multi-layered structure with inorganic and organic encapsulation layers, and exposing voltage lines to ensure effective sealing and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grooves are formed around through holes to prevent moisture and oxygen infiltration, then reliability is improved, but device complexity increases
Solution Approach 1:
The encapsulation structure is segmented into multiple functional components: grooves formed around through holes to create physical barriers, inorganic encapsulation layers deposited on specific surfaces, and organic encapsulation layers filling remaining spaces. This segmentation allows each component to address specific protection needs while maintaining overall system reliability
Solution Approach 2:
The patent employs composite encapsulation using both inorganic materials (such as aluminum oxide, silicon oxide) and organic materials (such as polyimide, acrylic). The inorganic layers provide barrier properties against moisture and oxygen penetration, while organic layers provide flexibility and fill gaps, creating a synergistic protective system that enhances reliability without excessive complexity
2Manufacturing precision
If voltage lines are exposed to ensure effective sealing, then manufacturing precision is improved, but object-generated harmful factors increase
Solution Approach 1:
Voltage lines are exposed and positioned in advance during the manufacturing process before final encapsulation. The grooves are formed and voltage lines are arranged in their final positions before the inorganic and organic encapsulation layers are applied, ensuring precise positioning while allowing subsequent protective layers to be deposited without disturbing the voltage line configuration
Solution Approach 2:
Thin film encapsulation layers (inorganic and organic) are deposited over the exposed voltage lines to provide protection. These thin films conform to the voltage line geometry and provide environmental protection while maintaining the electrical functionality and precise positioning of the voltage lines
Data Source
AI summary
A method of manufacturing a display apparatus includes forming a thin-film transistor on a substrate and forming a planarization layer to cover the thin-film transistor, forming, on the planarization layer, a pixel electrode electrically connected to the thin-film transistor and a pixel defining layer exposing at least a center portion of the pixel electrode, and defining at least one groove having a closed curve shape at a location corresponding to a second non-display area. When the thin-film transistor is formed, a voltage line is also formed at a location corresponding to a first non-display area. When the at least one groove is formed, a portion of the planarization layer disposed between the pad area and the display area is simultaneously removed such that a portion of the voltage line between the pad area and the display area is exposed.