Array Substrate Unidirectional Devices for Data-Data Short Circuit Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional array substrates face difficulties in detecting and locating data-data short (DDS) issues, which impairs the yield and repair process due to the inability to accurately determine short circuit locations using existing technologies.
Innovation Solution
The implementation of unidirectional devices at connection points between signal-load lines and data lead wires, allowing external testing signals to be transmitted in a single direction, enabling precise identification of short circuits without altering the testing process, and facilitating proper repair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional testing methods are used to detect data-data short circuits, then the testing process remains simple, but the ability to accurately locate short circuit positions is lost
Solution Approach 1:
The patent introduces unidirectional devices as intermediary components between signal-load lines and data lead wires. These devices allow testing signals to be injected in a controlled direction while blocking reverse signal flow, enabling precise localization of short circuits without requiring complex bidirectional testing arrangements. The unidirectional devices act as mediators that simplify the testing architecture while improving measurement precision.
2Reliability
If data lines in fanout region are made from gate metal layer to reduce horizontal lines, then display line defects are reduced, but data-data short circuits become difficult to detect and locate
Solution Approach 1:
The patent segments the data lead wires into groups, with each group connected to a dedicated signal-load line through unidirectional devices. This segmentation allows independent testing of each data lead wire group, enabling precise identification of which specific wire has a short circuit. The segmentation strategy maintains the reliability benefit of using gate metal layer for data lines while solving the detection difficulty.
3Measurement precision
If unidirectional devices are added at connection points to enable single-direction signal transmission, then short circuit location accuracy improves, but manufacturing complexity increases
Solution Approach 1:
The patent merges the formation of unidirectional devices with existing fabrication steps. The unidirectional devices are formed using the same gate metal layer and patterning processes already required for the display device, combining multiple functions into a single fabrication sequence. This merging approach reduces the overall manufacturing complexity despite adding functional components.
4Productivity
If multiple signal-load lines are used to connect to different groups of data lead wires, then testing capability and yield improvement are achieved, but device structure becomes more complex
Solution Approach 1:
The patent designs the unidirectional devices and signal-load line structure to serve multiple functions: they enable precise short circuit detection, facilitate yield improvement through better testing capability, and maintain compatibility with existing display device architectures. The same structural elements serve both testing and operational functions, reducing the need for separate dedicated testing structures.
Data Source
AI summary
The present application discloses a fabrication method for forming an array substrate, including: forming, in a fanout region, a first signal-load line connected to a first group of data lead wires, and a second signal-load line connected to a second group of data lead wires; and forming, in the fanout region, at least one unidirectional device at a connection point of the first signal-load line and a data lead wire, at least one unidirectional device at a connection point of the second signal-load line and a data lead wire. The first signal-load line and the second signal-load line are each configured to transmit an external testing signal along a single direction to the data lead wires through the unidirectional devices.