Display Panel Corner Guard Encapsulation Against Bubbles and Cracks
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Solution Overview
Problem
Existing encapsulation methods for display panels, particularly OLED display panels, often result in bubble formation and cracking at corner positions due to inadequate reinforcement, leading to compromised encapsulation effectiveness during transportation and use.
Innovation Solution
A display panel design featuring a reinforcing layer with corner guards and a closed-loop dam structure, where the corner guards match and support the dam's corners, and a filling layer that contacts the inner walls of the corner guards to prevent bubble formation and enhance structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional encapsulation methods are used for OLED display panels, then the encapsulation process is simple, but bubbles form and cracking occurs at corner positions during transportation and use
Solution Approach 1:
The patent applies local quality by adding corner guards specifically at the corner positions of the encapsulation structure. These corner guards provide localized reinforcement where stress concentration and cracking are most likely to occur, while the rest of the encapsulation structure maintains its original simple design. This targeted approach improves reliability at critical locations without unnecessarily complicating the entire encapsulation system.
Solution Approach 2:
The encapsulation structure is segmented into multiple functional components: the base encapsulation layer, corner guards at each corner position, and a filling layer. This segmentation allows each component to perform its specific function - the base structure provides overall encapsulation, corner guards prevent cracking at stress points, and the filling layer prevents bubble formation - thereby improving overall reliability through specialized local functions.
2Reliability
If corner reinforcement structures are added to prevent cracking, then the encapsulation effectiveness improves, but the manufacturing process becomes more complex
Solution Approach 1:
The corner guards are designed with pre-formed arc-shaped structures that match the corner geometry of the encapsulation. This preliminary shaping allows the corner guards to be directly positioned and attached to the corner positions without requiring complex on-site forming or adjustment operations, thereby reducing manufacturing complexity while maintaining effective cracking prevention.
Solution Approach 2:
The corner guards feature arc-shaped structures with specific radii that match the corner curvature of the encapsulation. This curved geometry naturally distributes stress along the arc, effectively preventing cracking, while the standardized arc shapes can be easily manufactured using conventional curving techniques, keeping the manufacturing process relatively simple.
3Reliability
If the filling layer contacts the inner walls of corner guards, then bubble formation is prevented, but the manufacturing precision requirements increase
Solution Approach 1:
The corner guards serve as intermediary structures between the filling layer and the corner positions. By providing a physical interface with inner walls that the filling layer contacts, the corner guards guide the filling layer material to properly fill the corner regions. This intermediary structure reduces the precision requirements for direct filling layer positioning, as the corner guards themselves provide the necessary geometric constraints.
Solution Approach 2:
The corner guards are pre-installed at the corner positions before the filling layer is applied. This preliminary action establishes the geometric boundaries and contact surfaces that guide the filling layer material, ensuring proper filling without requiring high precision during the filling operation itself. The pre-positioned corner guards act as templates for the filling process.
Data Source
AI summary
A display panel includes: a display substrate having a display area and a peripheral area around the display area; a cover plate assembled with the display substrate; a reinforcement layer disposed in the peripheral area, the reinforcement layer including a plurality of first corner guards, and the first corner guards being distributed around the display area at intervals; a dam disposed in the peripheral area, the dam being of a closed loop structure around the display area, the dam having a plurality of corners, and inner walls of the corners being matched with and in contact with outer walls of the first corner guards in one-to-one correspondence; and a filling layer filled in a space enclosed by the display substrate, the cover plate, the first corner guards and the dam, the filling layer being in contact with inner walls of the first corner guards.