OLED Repair Ring Width Variation for Voltage Drop Reduction
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Solution Overview
Problem
OLED displays face issues with voltage drops in signals through repair rings, which are used to address pixel defects, leading to undesired signal delays and inefficiencies.
Innovation Solution
The OLED display design incorporates a repair ring with specific structural features, including varying widths, contact holes, and peripheral signal lines, to minimize capacitance and electrical resistance, thereby suppressing voltage drops in the signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a repair ring is formed to repair defective pixels, then pixel defects can be repaired, but voltage drop occurs in the signal through the repair ring
Solution Approach 1:
The repair ring is designed with variable width where the first portion has a smaller width than the second portion. This local variation in geometry optimizes the balance between repair functionality and electrical performance, reducing voltage drop in specific critical areas while maintaining overall repair capability.
Solution Approach 2:
The width parameter of the repair ring is changed along its length, creating a tapered structure. This parameter change allows optimization of electrical characteristics (reducing resistance and voltage drop) while maintaining the structural integrity and repair function of the ring.
2Loss of energy
If the repair ring has a larger width to reduce resistance, then electrical resistance decreases, but capacitance increases causing signal delay
Solution Approach 1:
Different portions of the repair ring have different widths optimized for different functions: the first portion has smaller width to reduce capacitance and signal delay, while the second portion has larger width to reduce electrical resistance. This local optimization resolves the contradiction between resistance and capacitance.
Solution Approach 2:
The repair ring structure is extended into the vertical dimension with multiple layers (first and second portions at different heights). This dimensional expansion allows the structure to reduce resistance through increased cross-sectional area while maintaining reduced capacitance through strategic positioning and spacing.
Data Source
AI summary
An organic light-emitting diode display is disclosed. In one aspect, the display includes a substrate including a display area configured to display an image and a peripheral area surrounding the display area, a plurality of scan lines formed over the substrate and a plurality of data lines crossing the scan lines. A plurality of pixels is formed in the display area and electrically connected to the scan lines and the data lines, a repair ring is formed in the peripheral area and surrounding the display area, and the repair ring includes a first portion and a connecting portion different from the first portion. The first portion has a width less than that of the connecting portion different from the first portion. A driving circuit is configured to generate a data signal that is output to the data lines and the repair ring.