OLED Power Line Segmentation for Voltage Drop Repair
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Solution Overview
Problem
Organic light-emitting diode (OLED) displays face issues with voltage drops and increased short possibilities due to the wide power voltage supply line (ELVDD) overlapping with other wires, making it difficult to repair defective pixels effectively.
Innovation Solution
The display apparatus includes a configuration with sub pixels connected by scan lines and data lines, where a first power supply line is connected perpendicularly to the sub pixels, and additional second power supply lines are connected to the first power supply line, allowing for bypass functionality to prevent voltage drops and facilitate repair of defective pixels by disconnecting the first power supply line from defective sub pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power voltage supply line (ELVDD) is made wider to supply sufficient power, then the power supply capability is improved, but the area where the wire overlaps with other wires increases, thereby increasing the possibility of short between different wires
Solution Approach 1:
The first power supply line is divided into multiple segments by introducing second power supply lines that connect to intermediate points. This segmentation allows the power distribution network to maintain adequate power supply capability while reducing the width and overlap area of any single power line segment, thereby lowering short circuit risk.
Solution Approach 2:
Instead of extending the power supply line only in one direction, the patent introduces second power supply lines that extend in a perpendicular direction to connect to intermediate points of the first power supply line. This dimensional change creates a two-dimensional power distribution network that improves power delivery while reducing the required width of individual lines.
2Reliability
If the first power supply line is disconnected to repair a short circuit, then the short circuit is fixed, but the sub pixels connected to the first power supply line cannot receive power
Solution Approach 1:
The second power supply lines serve as intermediary power delivery paths. When a short circuit is detected in the first power supply line, the second power supply lines act as mediators to provide alternative power delivery routes to the affected sub pixels, allowing the system to maintain power delivery while isolating and repairing the defective section.
Solution Approach 2:
The patent enables localized power supply management where different sections of the display can be powered independently through the first and second power supply lines. When a short circuit occurs in one section, only that local area is affected and can be isolated for repair while other sections continue to receive power through the alternative path.
3Power
If the width of the power voltage supply line is increased, then the voltage drop is reduced, but the area of overlap with other wires increases
Solution Approach 1:
The power supply network is segmented into multiple first and second power supply lines that work together. This segmentation allows each individual line to have reduced width and overlap area while collectively maintaining sufficient current carrying capacity and voltage stability through the distributed network structure.
Data Source
AI summary
A display apparatus and a method of repairing a display apparatus are disclosed. According to one aspect, the display includes a plurality of unit pixels each including a plurality of sub pixels, scan lines branching off a scan wire in a first direction for each of the plurality of unit pixels and connecting the plurality of sub pixels emitting the same color as that of a neighboring unit pixel, data lines extending in a second direction orthogonal to the first direction and connected to the plurality of sub pixels, a first power supply line extending in the second direction and connected to the plurality of sub pixels, and second power supply lines extending in the first direction and connected to the first power supply line.