Parallel TFT Layout for Repairable Display Panel Short Circuits
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In display panels using gate drive on array (GOA) technology, short circuits between the gate and source or gate and drain of thin-film transistors (TFTs) cannot be repaired, leading to abnormal display and reduced yield.
Innovation Solution
A display panel design featuring a TFT layer with multiple TFTs arranged in parallel, where the first metal layer includes gates connected in parallel, and the second metal layer includes electrodes connected in parallel, with specific connection portions in cutting and non-cutting regions to facilitate laser repair of short circuits without damaging adjacent TFTs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the TFT in the pull-up module is set as a large-area entire structure to satisfy driving requirements, then the driving capability is improved, but the repairability of short circuits deteriorates
Solution Approach 1:
The gate connection portion is divided into multiple segments: a first connection portion connecting gates in parallel, and a second connection portion connecting first electrodes in parallel. These segments are spatially separated and can be independently cut by laser, allowing repair of short circuits while preserving other functional segments.
Solution Approach 2:
The gate connection portion and electrode connection portion are extracted as separate functional modules. The gate connection portion is positioned in a first region while the electrode connection portion is positioned in a second region, allowing independent laser cutting and repair operations on each module without affecting the other.
2Ease of repair
If laser cutting is performed to resolve short circuit between source and drain, then the short circuit repair is achieved, but short circuit between gate and source/drain cannot be repaired
Solution Approach 1:
The connection portions are segmented into gate connection portions and electrode connection portions located in different regions. This segmentation allows selective laser cutting of specific connection portions based on the type of short circuit, enabling repair of gate-to-source, gate-to-drain, and source-to-drain short circuits.
Solution Approach 2:
The gate connection portion and electrode connection portion serve as intermediary structures that can be independently modified by laser cutting. These intermediaries allow the laser to selectively disconnect specific electrical paths without directly affecting the TFT active regions, enabling versatile short circuit repair.
3Ease of manufacture
If the TFT structure is integrated in the entire array substrate, then the manufacturing simplicity is improved, but the precision of short circuit repair deteriorates
Solution Approach 1:
The integrated TFT structure is segmented into distinct connection portions (gate connection portion in first region, electrode connection portion in second region) that can be independently accessed and modified. This segmentation enables precise laser cutting operations on specific connection portions without affecting other parts of the integrated structure.
Solution Approach 2:
Different regions of the TFT structure are assigned different functional qualities: the gate connection portion in the first region is optimized for gate electrical connections, while the electrode connection portion in the second region is optimized for source/drain electrical connections. This local differentiation enables precise repair operations tailored to specific connection types.
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 design allows for the repair of short circuits between the gate and electrodes, ensuring other TFTs continue to function, thereby improving display panel reliability and yield by enabling laser cutting within designated regions.
Implementation Method 1
a drain part of the short-circuited TFT is cut off merely in a laser manner to resolve a short circuit between a source and a drain of the TFT
Data Source
AI summary
A display panel and a mobile terminal are provided. The display panel includes a base and a thin film transistor (TFT) layer that is disposed on the base and includes at least two TFTs arranged in parallel. According to the present disclosure, the TFT layer includes at least two TFTs arranged in parallel, thereby resolving the problem that a short circuit between a gate and a source and/or a short circuit between the gate and a drain in the TFT cannot be repaired.