OLED Display Connection Line Segmentation for Laser Repair
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Solution Overview
Problem
The repair process for OLED displays faces a low success rate due to difficulties in cutting signal lines, particularly the thick copper layers in the power and sensing connection lines, which can lead to short circuits during the laser cutting process.
Innovation Solution
The OLED display device is designed with the power and sensing connection lines having a one-layered structure in the repair portion, formed from materials like molybdenum titanium, allowing for easier laser cutting and preventing copper flow and short circuits by reducing the thickness to 100 Å to 1,500 Å, while the gate lines maintain a two-layered structure for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power connection line and sensing connection line have a thick multi-layered copper structure, then the electrical conductivity and current carrying capacity are improved, but the laser cutting difficulty increases and short circuit risk during repair increases
Solution Approach 1:
The connection line is divided into two distinct parts: a first portion with a thick multi-layered copper structure for high conductivity in non-repair areas, and a second portion with a thin single-layer copper structure for easy laser cutting in repair areas. This segmentation allows each part to optimize its function independently.
Solution Approach 2:
Different portions of the connection line have different structural characteristics tailored to their specific functions. The first portion has thick multi-layered copper for electrical performance, while the second portion has thin single-layer copper for repairability. This local differentiation resolves the contradiction between conductivity and ease of repair.
2Reliability
If the power connection line and sensing connection line have a thick multi-layered copper structure, then the electrical conductivity is improved, but the risk of copper flow and short circuit during laser cutting increases
Solution Approach 1:
The connection line is segmented into a first portion with thick copper for conductivity and a second portion with thin copper for safe laser processing. This segmentation isolates the harmful effect to only the thin portion during repair, while the thick portion maintains electrical performance.
Solution Approach 2:
The thin single-layer copper portion acts as an intermediary structure that facilitates safe laser cutting. It serves as a controlled interface between the thick copper structure and the laser beam, preventing direct interaction between high-power laser and thick copper that would cause melting and short circuits.
3Ease of repair
If the connection lines have a reduced thickness for easier laser cutting, then the repair success rate is improved, but the electrical conductivity and current carrying capacity decrease
Solution Approach 1:
The connection line is segmented into two portions with different thicknesses. The first portion maintains thick multi-layered copper for high conductivity, while the second portion uses thin single-layer copper for easy repair. This segmentation allows the system to achieve both high repair success rate and maintained electrical conductivity through the first portion.
Solution Approach 2:
Different portions of the connection line have different thickness characteristics optimized for their specific roles. The first portion has thick copper for electrical performance, while the second portion has thin copper for repairability. This local quality differentiation resolves the contradiction between repair ease and conductivity.
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 configuration enhances the repair success rate by facilitating precise laser cutting of the connection lines and prevents short circuits, ensuring reliable repair processes without damaging the display components.
Implementation Method 1
a success rate of the repair process is reduced depending on a thickness, a stacking structure, or a position of the signal line, etc.
Data Source
AI summary
A display device for increasing a repair success rate by easily cutting signal lines in a repair process of subpixels and preventing a short circuit of the signal lines is disclosed. The display device includes subpixels positioned on a first substrate, each subpixel including an emission area, in which a light emitting element is disposed, and a circuit area in which a circuit for driving the light emitting element is disposed, and a first power connection line, a sensing connection line, and at least one gate line positioned in the circuit area and connected to the subpixels. A number of stacked layers of a portion of at least one of the first power connection line and the sensing connection line is less than a number of stacked layers of the gate line.