Display Device Power Supply Line Branch Spacing
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Solution Overview
Problem
Existing display devices face issues with lifting defects or corrosion defects in the junction area, which can lead to rapid deterioration of the organic light emitting material and reduce the quality and lifespan of the display.
Innovation Solution
A display device design that includes a substrate with a main area and a sub-area, a circuit layer with a power supply line that has a branch portion in the junction area, and a sealing layer that prevents oxygen or moisture permeation. The branch portion of the power supply line is spaced apart from the bank and dam portions, reducing the impact of tensile forces and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the power supply line is disposed close to the bank and dam portions in the junction area, then the device complexity is reduced, but lifting defects and corrosion defects occur due to tensile forces
Solution Approach 1:
The branch portion of the power supply line is extracted from the high-stress region near the bank and dam portions, and disposed in a separate location within the junction area. This spatial separation removes the power supply line from the harmful tensile force zone, preventing lifting and corrosion defects while maintaining functional connectivity through the sub-connection portion.
2Reliability
If the branch portion is spaced apart from the bank and dam portions, then lifting defects and corrosion defects are reduced, but the device complexity increases
Solution Approach 1:
The power supply line is segmented into distinct functional portions: the sub-connection portion that extends from the main supply and connects to the branch, and the branch portion that protrudes to supply power in the junction area. This segmentation allows each portion to be optimized for its specific function while reducing overall device complexity through modular design.
3Duration of action of stationary object
If the sealing layer is added to prevent oxygen and moisture permeation, then the lifespan is improved, but the device complexity increases
Solution Approach 1:
The sealing layer serves multiple functions simultaneously: it provides the primary barrier against oxygen and moisture permeation to protect the organic light emitting material, and it structurally seals the junction area where the power supply line is disposed. This multi-functionality extends the lifespan of the display device without proportionally increasing device complexity.
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 proposed solution effectively reduces the likelihood of lifting defects and corrosion in the junction area, thereby improving the quality and lifespan of the display device by preventing moisture and oxygen ingress.
Implementation Method 1
The sealing layer may block permeation of oxygen or moisture, thereby preventing rapid deterioration of the organic light emitting material of the light emitting element layer.
Data Source
AI summary
A display device includes a substrate, a circuit layer, an element layer, and a sealing layer. The substrate includes a main area and a sub-area. The main area includes a display area and a non-display area. The non-display area includes a dam area in which one or more dam portions surrounding the display area are arranged, and a junction area surrounding the dam area. The sub-area includes a bending area, a first sub-area, and a second sub-area. The circuit layer includes a power supply line. The power supply line includes a main supply portion disposed in the non-display area, a sub-connection portion extending from the main supply portion to the sub-area, and a branch portion disposed in the junction area and protruding from one side of the sub-connection portion. The branch portion is spaced apart from a bank covering a bending hole of the bending area.