OLED Pixel Repair Using Shorting Assistance Material
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for repairing defective pixels in organic light emitting diode displays, such as the laser repair process, often result in unwanted damage due to high-energy laser beams, which can destroy the insulating layer or metal and fail to properly form a short circuit.
Innovation Solution
The organic light emitting diode display incorporates a substrate with a scan line, repair line, data line, and driving voltage line, along with transistors and an organic light emitting diode, utilizing a first shorting assistance material to induce a chain reaction and form a short between the repair line and emission control connector when a laser beam of predetermined energy is applied, allowing for effective repair without excessive damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-energy laser beam is used to short-circuit the data wire and connect the transistor and organic light emitting diode to a metal repair line, then the short circuit can be formed, but the insulating layer or metal are destroyed by the excessive energy of the beam
Solution Approach 1:
The patent introduces a shorting assistance material as an intermediary substance between the repair line and the emission control connector. This material has a melting point lower than both the repair line and connector materials, allowing it to melt first and create a conductive path without requiring high energy that would damage the surrounding insulating layer or metal structures.
Solution Approach 2:
The patent changes the physical parameter (melting point) of the shorting assistance material to be lower than the repair line and emission control connector. This parameter difference enables the laser beam to selectively melt the assistance material at lower energy levels, forming a short circuit without destroying the insulating layer or metal components.
2Ease of manufacture
If a high-energy laser beam is applied to form a short circuit, then the connecting member can be shorted, but the short circuit may not properly form while the insulating layer or metal are destroyed
Solution Approach 1:
The shorting assistance material serves as a mediator that facilitates short circuit formation at lower energy levels. Its lower melting point allows it to melt and create a conductive path before the repair line or emission control connector are affected, ensuring precise short circuit formation without collateral damage.
Solution Approach 2:
The patent converts the potentially harmful high-energy laser beam into a beneficial low-energy process by introducing the shorting assistance material. The material's lower melting point allows the laser energy to be focused on melting only the assistance material, transforming what would be excessive energy into a controlled, precise manufacturing process.
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 enables successful repair of defective pixels using a low-energy laser beam, reducing damage and improving the success rate of the repair process by facilitating a chain reaction that forms a short between the repair line and emission control connector.
Implementation Method 1
when a laser beam in a predetermined energy range is applied
Implementation Method 2
the first shorting assistance material to induce a chain reaction to allow a short to form between the repair line and the emission control connector
Data Source
AI summary
An organic light emitting diode display includes an emission control connector between a driving transistor and an organic light emitting diode of a pixel. The emission control connector connects the driving transistor and the organic light emitting diode and overlaps a portion of a repair line. A first shorting assistance member overlaps the repair line and the emission control connector, and serves to induce a chain reaction to allow a short to form between the repair line and the emission control connector when a low-energy laser beam is applied.