Display Cell Power Line Slit Pattern for Laser Cut-Off Cracks
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Solution Overview
Problem
During the manufacturing process of OLED display cells, the wide metal lines used for power supply voltage lines are prone to defects such as cracks due to incomplete laser processing, which can lead to failures in the display cell.
Innovation Solution
The power supply voltage lines are divided into sublines by a slit pattern in the cut-off area between the peripheral and turn-on inspection areas, with the slit pattern and sublines being exposed to prevent cracks by ensuring the laser can penetrate effectively during the cutting process, and the insulating films are designed to include inorganic and organic materials over specific electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If wide metal lines are used for power supply voltage lines, then current carrying capacity is improved, but laser processing completeness deteriorates causing cracks
Solution Approach 1:
The power supply voltage line is divided into multiple sublines (first subline, second subline, third subline) separated by slits. This segmentation allows the laser to effectively process each narrower subline individually while maintaining the overall current carrying capacity through the parallel arrangement of multiple sublines.
Solution Approach 2:
The metal line structure is made non-uniform by introducing slits that create regions of different widths. The sublines have optimized local dimensions that balance current carrying requirements with laser processing capabilities, with each subline having appropriate width and spacing to ensure complete laser penetration while contributing to the total current capacity.
2Manufacturing precision
If slit width is increased to enable laser penetration, then laser processing effectiveness is improved, but electrical conductivity may deteriorate
Solution Approach 1:
The power supply voltage line is divided into multiple sublines (first subline, second subline, third subline) separated by slits. This segmentation allows the laser to effectively process each narrower subline individually while maintaining the overall current carrying capacity through the parallel arrangement of multiple sublines.
Solution Approach 2:
The metal line structure is made non-uniform by introducing slits that create regions of different widths. The sublines have optimized local dimensions that balance current carrying requirements with laser processing capabilities, with each subline having appropriate width and spacing to ensure complete laser penetration while contributing to the total current capacity.
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
This solution prevents defects like cracks in the display cell during the laser cutting process, ensuring the integrity and functionality of the power supply voltage lines, thereby enhancing the manufacturing reliability of OLED display cells.
Implementation Method 1
the slit pattern's width set to be greater than the laser spot pitch, allowing for effective laser penetration and preventing cracks
Data Source
AI summary
A display cell includes a signal line electrically connected to a pixel arranged in a display area, a signal pad unit disposed in a peripheral area adjacent to the display area, and including a signal pad electrically connected to the signal line, an inspection pad unit disposed in a turn-on inspection area, and including an inspection pad electrically connected to the signal pad, where the inspection pad is configured to receive a turn-on inspection signal, and a power supply voltage line configured to apply a power supply voltage to the pixel, extending from the inspection pad unit to the peripheral area, and divided into a plurality of sublines by at least one slit pattern in a cut-off area between the peripheral area and the turn-on inspection area.