OLED Display Substrate Protrusion Array Sealant Bonding
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Solution Overview
Problem
The Frit packaging technique for OLEDs is prone to water and oxygen erosion due to detachment and cracking of the frame sealant, leading to air leakage and reliability issues in OLED display devices.
Innovation Solution
A display substrate with functional films featuring a protrusion array on one side, where the protrusion portions are embedded in the frame sealant during assembly, enhancing the bonding strength and preventing displacement, thus reducing the likelihood of sealant detachment and cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Frit packaging technique is used with inorganic packaging medium, then water and oxygen blocking ability is improved, but frame sealant detachment and cracking occurs leading to reliability deterioration
Solution Approach 1:
The patent applies local quality by creating protrusion arrays at specific locations on the functional films where frame sealant bonding is critical. These protrusions are strategically positioned to enhance local bonding strength without affecting the overall packaging structure or the water/oxygen blocking properties of the inorganic packaging medium.
Solution Approach 2:
The patent transitions from a two-dimensional flat functional film surface to a three-dimensional structure with protrusions. This dimensional change increases the contact surface area between the functional film and frame sealant, providing mechanical interlocking that prevents detachment and cracking while maintaining the packaging's hermetic seal.
2Strength
If frame sealant is used to bond substrates, then substrate bonding is achieved, but displacement and cracking occur causing water and oxygen erosion
Solution Approach 1:
The patent creates a composite structure by integrating protrusion arrays into the functional films. This composite design combines the adhesive properties of the frame sealant with the mechanical interlocking capability of the protrusions, resulting in a bonded joint that resists both displacement and cracking forces.
Solution Approach 2:
The protrusion arrays are pre-formed on the functional films before the frame sealant is applied. This preliminary action ensures that when the frame sealant is bonded, the protrusions are already in position to provide immediate mechanical interlocking, preventing displacement before it can occur and reducing stress concentration that leads to cracking.
3Strength
If protrusion array is added to functional films, then bonding strength is improved, but device complexity increases
Solution Approach 1:
The patent segments the functional film surface into distinct regions: flat areas for general functionality and protrusion array regions for enhanced bonding. This segmentation allows the complex protrusion structure to be localized only where needed for frame sealant attachment, rather than complicating the entire functional film structure.
Data Source
AI summary
A display substrate, a method for fabricating the same, and a display apparatus are disclosed. The display substrate is provided with functional films, at least one of the functional films includes a protrusion array on a side away from the display substrate. When the display substrate is assembled with another display substrate, protrusion portions of the protrusion array are embedded into a frame sealant between the display substrate and the another display substrate.