Liquid Repellent Barrier Rib for Display Ink Deposition
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Solution Overview
Problem
Display devices face defects and reliability issues due to the ink deposition process, particularly with ink mislanding, which can lead to gaps and cracks in the encapsulation layer, affecting the performance and longevity of the display.
Innovation Solution
A display device design featuring a barrier rib with distinct liquid repellent properties, where a first portion surrounding the light emitting regions is more liquid repellent than a second portion, preventing ink from spreading and reducing defects during the manufacturing process. This design includes a method of forming the barrier rib with varying light exposure levels to enhance liquid repellency and a structure with optical patterns within the openings to manage ink deposition effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ink is deposited during the manufacturing process, then optical patterns are formed, but ink mislanding occurs causing gaps and cracks in the encapsulation layer
Solution Approach 1:
The barrier rib acts as an intermediary structure between the ink deposition area and the encapsulation layer. It provides a dedicated pathway (opening) for ink to reach the optical pattern while preventing ink from spreading to areas that would compromise encapsulation layer integrity, thus resolving the conflict between deposition precision and reliability
Solution Approach 2:
The barrier rib structure creates locally differentiated properties: the opening region allows ink passage while the surrounding barrier portions prevent ink spread. This local quality differentiation enables precise ink deposition without compromising overall encapsulation integrity
2Reliability
If the barrier rib is made more liquid repellent to prevent ink spread, then ink mislanding is reduced, but the bonding process becomes more difficult
Solution Approach 1:
The barrier rib exhibits local quality differentiation in its liquid repellent properties. The opening portion has reduced liquid repellency to allow ink passage, while the surrounding barrier portions maintain high liquid repellency to prevent ink spread. This localized property variation resolves the contradiction between preventing ink mislanding and maintaining bonding ease
3Manufacturing precision
If the first portion of the barrier rib is more liquid repellent than the second portion, then ink spreading is prevented, but the structure becomes more complex
Solution Approach 1:
The barrier rib implements local quality by creating two portions with different liquid repellent properties. The first portion (opening area) has lower liquid repellency for ink access, while the second portion (barrier area) has higher liquid repellency for ink containment. This local differentiation achieves precise ink placement control without requiring complex external control systems
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
The solution effectively reduces defects and enhances the reliability of the display device by minimizing ink mislanding and subsequent bonding issues, leading to improved durability and performance by maintaining a consistent encapsulation layer.
Implementation Method 1
the first portion may be more liquid repellent than the second portion
Data Source
AI summary
A display device includes: a display layer in which a plurality of light emitting regions are defined; a barrier rib disposed on the display layer and having a plurality of first openings overlapping the plurality of light emitting regions defined therein; and a plurality of optical patterns disposed in the plurality of first openings. The barrier rib may include a first portion around the plurality of first openings and a second portion spaced apart from the plurality of first openings with the first portion therebetween, and the first portion may be more liquid repellent than the second portion.