Display Panel Protrusion Pattern for Sealing Uniformity
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Solution Overview
Problem
In organic EL display panels, the thick sealing material at the outer edge can lead to gaps and humidity invasion, causing faulty mounting issues and increased production costs due to the need for high viscosity materials or additional structural features like partitions.
Innovation Solution
A protrusion pattern on the opposing substrate, matching the layer structure of the display region, is used to equalize the sealing material thickness, dispersing pressure and preventing protrusion, thus reducing the likelihood of gaps and mounting faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thick sealing material is used at the outer edge to ensure sealing coverage, then sealing reliability is improved, but manufacturing precision deteriorates due to gaps and protrusions
Solution Approach 1:
A protrusion pattern is formed on the opposing substrate before sealing material application. This preliminary structural feature pre-determines the sealing material thickness distribution, ensuring uniform thickness while maintaining adequate sealing coverage at the outer edge, thereby preventing gaps and protrusions during the sealing process
Solution Approach 2:
The protrusion pattern creates localized structural variations on the opposing substrate, with different heights in different regions. This local quality variation allows the sealing material to maintain uniform thickness overall while providing enhanced sealing capability at specific critical locations such as the outer edge, resolving the contradiction between uniformity and sealing reliability
2Object-affected harmful factors
If thick sealing material is used at the outer edge to prevent humidity invasion, then protection against harmful factors is improved, but device complexity increases due to protrusion issues
Solution Approach 1:
The protrusion pattern is pre-formed on the opposing substrate to control sealing material distribution. This preliminary action ensures that the sealing material forms a uniform, gap-free layer that effectively prevents humidity invasion without creating complex protrusion structures that would increase device complexity
Solution Approach 2:
The protrusion pattern creates a simplified structural solution where the sealing material thickness is controlled by the pre-formed pattern rather than by varying the material application process. This copying of the structural feature simplifies the overall sealing structure while maintaining effective humidity protection
3Reliability
If thick sealing material is used to ensure coverage, then sealing effectiveness is improved, but productivity deteriorates due to faulty mounting and reduced yield
Solution Approach 1:
The protrusion pattern is formed in advance on the opposing substrate to pre-determine the sealing material thickness distribution. This preliminary action ensures uniform sealing material application, eliminating gaps and protrusions that cause mounting faults, thereby improving production yield without sacrificing sealing effectiveness
Solution Approach 2:
The invention replaces complex mechanical control of sealing material application with a pre-formed structural pattern on the opposing substrate. This substitution simplifies the sealing process, reduces variability in sealing material thickness, and eliminates defects that would require rework or scrap, thus improving productivity and yield
Data Source
AI summary
A display panel is disclosed which suppresses appearance of structural fault at a frame portion of an opposing glass plate. The display panel has a panel structure ready for an active matrix driving method and includes an element having a formation face on which pixel circuits are formed, and an opposing substrate configured to seal the formation face. The opposing substrate has a protrusion pattern formed in a region thereof opposing to an outer edge of the opposing substrate. The protrusion pattern has a layer structure similar to that in a display region of the formation face.