Third Dam Structure for Organic Material Overflow Control
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Solution Overview
Problem
Existing display apparatuses face challenges in effectively controlling the overflow of organic materials in narrow dead spaces, leading to potential defects and impurity infiltration due to reduced dead space areas.
Innovation Solution
The implementation of a third dam structure between the display area and the first dam, featuring a first insulating layer with protrusions and a second insulating layer in dot patterns, reduces the reflow velocity of organic materials and redirects overflowed materials back to the display area, thereby controlling the amount and location of organic material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the dead space area is reduced to minimize the display apparatus size, then the area occupied by the display apparatus is reduced, but the control of organic material overflow becomes ineffective leading to defects and impurity infiltration
Solution Approach 1:
The dam structure is segmented into multiple insulating layers (first insulating layer and second insulating layer) with different patterns. The first insulating layer has a continuous pattern while the second insulating layer has a dot pattern, creating segmented barriers that effectively control organic material overflow in the reduced dead space area.
Solution Approach 2:
Different regions of the dam structure have different local qualities through the use of continuous and dot patterns in the insulating layers. The continuous pattern provides complete barrier coverage while the dot pattern allows selective overflow control, enabling effective management of organic materials in specific local areas of the narrow dead space.
2Device complexity
If a simple dam structure is used, then the device complexity is reduced, but the ability to control organic material reflow velocity and redirect overflow is insufficient
Solution Approach 1:
The dam structure is divided into multiple insulating layers with distinct patterns. The first insulating layer provides a continuous barrier while the second insulating layer with dot patterns creates controlled overflow paths. This segmentation enables precise control of organic material flow without requiring complex three-dimensional structures.
Solution Approach 2:
The multi-layer insulating structure acts as an intermediary between the display area and the external environment. It mediates the flow of organic materials by providing both continuous and dot patterns that control reflow velocity and redirect overflow, achieving precise control without direct complex mechanical intervention.
3Area of stationary object
If the dead space is minimized, then the display apparatus area is reduced, but impurity infiltration increases due to insufficient overflow control
Solution Approach 1:
The dam structure segments the overflow control function into multiple insulating layers with different patterns. This segmentation creates effective barriers that prevent impurity infiltration while maintaining a minimized display apparatus area, as the layered structure provides comprehensive protection without requiring large dead space.
Solution Approach 2:
The continuous and dot patterns in different insulating layers provide localized quality variations that specifically address impurity prevention. The continuous pattern blocks impurity paths while the dot pattern manages overflow, effectively preventing impurity infiltration in the compact design.
Data Source
AI summary
A display apparatus includes a substrate, a display area including a plurality of pixels, a non-display area outside the display area, a first dam surrounding the display area, a second dam surrounding the first dam, a third dam between the display area and the first dam. The third dam including a first insulating layer and a second insulating layer on the first insulating layer, and a thin film encapsulation layer covering the display area, the thin film encapsulation layer including at least one inorganic encapsulation layer and at least one organic encapsulation layer. The third dam includes a first region in which the second insulating layer is spaced along a direction in which the first insulating layer extends, and a second region in which the second insulating layer is continuously present along the direction in which the first insulating layer extends, the second region not overlapping the first region.