OLED Power Line Slit Layout for Crack-Free Laser Cut-Off
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Solution Overview
Problem
During the manufacturing process of OLED display cells, the large width of power supply voltage lines can lead to defects such as cracks due to incomplete laser processing, which affects the integrity and functionality of the display cells.
Innovation Solution
The power supply voltage lines are divided into sublines by a slit pattern in the cut-off area, with the slit pattern's width set greater than or equal to the pitch of the laser spot, allowing for effective laser penetration and preventing cracks during the cutting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power supply voltage line has a large width to ensure adequate power supply, then the power supply capability is improved, but laser processing completeness deteriorates leading to cracks
Solution Approach 1:
The power supply voltage line is divided into multiple sublines by introducing slit patterns. This segmentation allows the laser to completely process through each narrower subline without the incompleteness issues that occur with wide lines, while the collective arrangement of sublines maintains the required power supply capability.
2Reliability
If the power supply voltage line is made wider to reduce resistance, then the electrical conductivity is improved, but the structural integrity deteriorates due to laser processing defects
Solution Approach 1:
The wide power supply voltage line is segmented into multiple narrower sublines using slit patterns. Each subline can be completely processed by the laser without defects, ensuring structural integrity, while the parallel arrangement of sublines collectively provides the required electrical conductivity and low resistance.
3Manufacturing precision
If the slit pattern width is increased to ensure complete laser penetration, then the laser processing completeness is improved, but the power supply efficiency may deteriorate
Solution Approach 1:
The slit pattern width is optimized to a specific range (greater than or equal to the laser spot pitch) to ensure complete laser penetration and processing completeness. The number and arrangement of slits are adjusted to maintain adequate conductive cross-section, balancing laser processing completeness with power supply efficiency.
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 cells by ensuring complete laser processing, maintaining the structural integrity and functionality of the OLED display cells.
Implementation Method 1
the slit pattern's width set greater than or equal to the pitch of the laser spot, allowing for effective laser penetration
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.