Display Device Outer Dam for Bezel Reduction and Encapsulation Control
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Solution Overview
Problem
Existing display devices face challenges in reducing bezel size, preventing organic encapsulation layer overflow, and minimizing crack formation, which affect process efficiency.
Innovation Solution
Incorporation of an outer dam structure that includes a first and second outer dam, with the first dam having a greater height than the second, and a substrate design with specific layers and materials to enhance protection and reduce bezel size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the bezel size is reduced, then the display area is increased, but the organic encapsulation layer may overflow through the outer dam
Solution Approach 1:
The encapsulation system is segmented into multiple layers (first encapsulation layer, second encapsulation layer) with the organic encapsulation layer positioned between them. The outer dam is also segmented into multiple structural components (bank, protective layer) that work together to contain the encapsulation layers, preventing overflow while maintaining a reduced bezel size.
Solution Approach 2:
The outer dam structure including the bank and protective layer is formed in advance before the organic encapsulation layer is deposited. This preliminary action creates a containment structure that prevents the organic encapsulation layer from overflowing during the subsequent inkjet printing process, enabling reduced bezel size without compromising containment reliability.
2Reliability
If the outer dam height is increased to prevent encapsulation layer overflow, then the containment reliability is improved, but the device complexity increases
Solution Approach 1:
The outer dam structure merges multiple functions into a unified design. The bank and protective layer are combined to form an integrated outer dam that provides both mechanical containment and structural support. This merging reduces the number of separate components needed, thereby reducing device complexity while maintaining effective containment of the encapsulation layers.
Solution Approach 2:
The outer dam structure serves multiple functions simultaneously: it acts as a containment barrier for the organic encapsulation layer, provides mechanical support for the encapsulation layers, and contributes to the overall structural integrity of the display device. This multi-functionality reduces the need for additional dedicated components, thereby reducing device complexity.
3Productivity
If the outer dam is designed to function as both dam and crack stopper, then the process efficiency is increased, but the manufacturing precision requirements are increased
Solution Approach 1:
The outer dam structure is designed to perform multiple functions: containing the organic encapsulation layer during manufacturing and preventing crack propagation in the final device. By integrating the crack stopper function into the existing outer dam structure, the patent eliminates the need for separate crack prevention components, thereby improving process efficiency. The unified structure maintains manufacturing precision by providing clear structural guidelines for formation.
Data Source
AI summary
Embodiments of the present disclosure relate to a display device. A display device may include a substrate including a display area and a non-display area, a first planarization layer disposed on the substrate, a second planarization layer disposed on the first planarization layer, a bank disposed on the second planarization layer, a first encapsulation layer disposed on the bank, a touch sensor disposed on the first encapsulation layer, a second encapsulation layer disposed on the touch sensor, and a first outer dam disposed on an outer side of the second encapsulation layer, and including at least one of the first planarization layer, the second planarization layer, and the bank, thereby reducing the bezel size.