OLED Repair Ring Bypasses Faulty Data Lines
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Solution Overview
Problem
Conventional organic light emitting diode (OLED) displays face challenges in repairing faulty pixels without experiencing a voltage drop, which hinders effective image display and device performance.
Innovation Solution
The solution involves a substrate with a display unit, scan lines, data lines, pixels, a repair ring, driving pads, and a driving circuit that allows for the transmission of data signals to dummy pads connected to the repair ring, enabling the short-circuiting of faulty data lines and the transmission of signals through the repair ring to faulty pixels without voltage drops, using a dummy connection wire for enhanced signal path elongation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional repair methods are used for faulty pixels in OLED displays, then repair can be attempted, but voltage drop occurs during the repair process which hinders effective image display and device performance
Solution Approach 1:
A dummy data line is introduced as an intermediary pathway to bypass the faulty data line. The dummy data line is connected to a repair pad, allowing signal transmission through an alternative route that avoids the voltage drop issue in the original faulty line, thus enabling successful pixel repair without energy loss.
Solution Approach 2:
The data transmission path is segmented into multiple routes: the original data line and the alternative dummy data line. By dividing the signal path, the system can switch to the dummy line when the original line experiences voltage drop, ensuring continuous and reliable signal transmission for pixel repair operations.
2Reliability
If a repair ring is added to the OLED display structure, then faulty pixels can be repaired without voltage drop, but device complexity increases
Solution Approach 1:
The dummy data line and repair pad structure serve multiple functions: they act as a backup transmission path for faulty lines, provide a routing path for laser repair processes, and can be integrated into existing OLED manufacturing workflows. This multi-functionality justifies the added structural elements by providing versatile repair capabilities.
Solution Approach 2:
The repair pad is positioned at the periphery of the display panel, utilizing the peripheral space dimension rather than occupying display area. This spatial arrangement allows the repair infrastructure to be added without compromising the active display region, effectively managing structural 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
This method allows for the successful repair of faulty pixels in OLED displays without voltage drops, ensuring continuous image display and improved device performance by effectively driving faulty data lines through the repair ring, thereby maintaining image quality and extending device lifespan.
Implementation Method 1
a driving circuit configured to transmit a data signal to the plurality of driving pads and to the pair of dummy driving pads
Implementation Method 2
an amplifier positioned at the driving circuit output line
Data Source
AI summary
An organic light emitting device includes a substrate including a display unit configured to display an image and a peripheral portion surrounding the display unit, a plurality of scan lines on the substrate and extending in a first direction, a plurality of data lines on the substrate and intersecting the scan lines in a second direction, a plurality of pixels at the display unit and connected to the scan lines and the data lines, a repair ring surrounding the display unit, a plurality of driving pads on the peripheral portion and connected to ends of the plurality of data lines, a pair of dummy driving pads on the peripheral portion and connected to ends of the repair ring, and a driving circuit configured to transmit a data signal to the plurality of driving pads and to the pair of dummy driving pads.