OLED Anode Cutout for Detour Path Short Circuit Prevention
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Solution Overview
Problem
In organic light emitting diode (OLED) displays, over-deposition of conductive materials during the formation of connection bridges can lead to short circuits with other metal or conductive materials, causing pixel defects and reducing the reliability of detour paths for data signals.
Innovation Solution
The design incorporates a cutout in the anode electrode corresponding to the data line, allowing for the formation of a detour path using a connection bridge, which reduces the likelihood of short circuits even when the conductive material is over-deposited by positioning the cutout concave from one edge towards the center of the electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a connection bridge is formed by sputtering tungsten to create a detour path, then the data signal can be routed around defective pixels, but over-deposition of the conductive material causes the connection bridge to protrude and increase the possibility of short circuits with other conductive materials
Solution Approach 1:
The anode is intentionally cut out at the position corresponding to the data line, extracting the problematic overlapping region. This removal eliminates the risk of short circuits between the connection bridge and the anode, while still allowing the connection bridge to form a detour path for the data signal through the exposed data line.
Solution Approach 2:
The anode cutout is formed in advance before the connection bridge is deposited. This preliminary action prepares the structure to accommodate the connection bridge without causing short circuits, even if over-deposition occurs. The cutout is positioned to expose the data line, ensuring the detour path can be formed subsequently.
2Reliability
If the data line is disconnected at the defective pixel to prevent signal leakage, then the defective pixel becomes a black pixel, but a detour path must be formed to maintain data signal transmission to other pixels
Solution Approach 1:
The data line is segmented at the defective pixel location by disconnecting it, creating separate sections. The connection bridge then provides an alternative routing path that bypasses the disconnected section, allowing the data signal to reach subsequent pixels without passing through the defective pixel.
Solution Approach 2:
The connection bridge acts as an intermediary structure that mediates between the disconnected portions of the data line. It provides a detour path that allows the data signal to bypass the defective pixel while maintaining electrical connectivity to the rest of the display.
Data Source
AI summary
An organic light emitting diode display according to an example embodiment of the present invention includes: a substrate; a scan line and a data line that are insulated from one another and crossing each other on the substrate; a first transistor on the substrate and connected to the scan line and the data line; a second transistor connected to the first transistor; a first electrode connected to the second transistor and having a cutout; an organic emission layer on the first electrode; and a second electrode on the organic emission layer, wherein the cutout is at a position corresponding to the data line.