Pixel Driving Circuit Redundant Switch Transistors for Carbon Nanotube Short Circuits
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The presence of metallic single-walled carbon nanotubes in semiconductor single-walled carbon nanotube channels of TFT devices can cause short circuits, leading to abnormal TFT device performance and display defects in display panels due to uncontrolled current flow between the source and drain.
Innovation Solution
A pixel driving circuit with N redundant switch transistors, where the gate of each switch transistor and redundant switch transistor is coupled to a gate line, and the electrodes are connected in series, allowing normal operation even if one switch transistor is short-circuited, ensuring the display panel's functionality and reducing maintenance costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If semiconductor single-walled carbon nanotube material is used for TFT channel, then mobility and flexibility are improved, but metallic nanotubes may cause short circuits and device failure
Solution Approach 1:
The patent introduces a redundant switch transistor connected in parallel with the main switch transistor. This redundant component serves as a pre-prepared backup that can compensate for potential failures caused by metallic nanotube short circuits, thereby cushioning the harmful effects before they propagate through the display panel circuitry.
Solution Approach 2:
The patent modifies the circuit configuration by adding redundant transistors and changing the connectivity structure. This parameter change transforms the system from a single-point-failure configuration to a fault-tolerant configuration, allowing the display panel to maintain functionality even when metallic nanotubes cause short circuits in individual transistors.
2Reliability
If redundant switch transistors are added to the pixel driving circuit, then fault tolerance and yield are improved, but device complexity and area increase
Solution Approach 1:
The patent segments the switching function into multiple independent transistor units (main switch transistor and redundant switch transistors). Each segment operates independently, and the segmentation allows failure isolation so that defects in one segment do not affect the overall system functionality, thereby improving yield without requiring complete circuit redesign.
Solution Approach 2:
The patent creates copies of the switch transistor structure (redundant switch transistors) that replicate the basic transistor design. This copying approach leverages existing proven transistor designs and processes, reducing the complexity of verifying new designs while providing fault tolerance through duplication.
3Productivity
If redundant switch transistors are implemented in the pixel driving circuit, then maintenance costs are reduced through improved yield, but manufacturing complexity increases
Solution Approach 1:
The patent merges the main switch transistor and redundant switch transistors into a unified pixel driving circuit structure that shares common elements such as gate lines, data lines, and control signaling. This merging approach allows the redundant components to be manufactured using the same process steps and material layers as the main transistor, thereby reducing manufacturing complexity despite the increased component count.
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
The redundant switch transistors in the pixel driving circuit prevent display failures by maintaining switching functionality when short circuits occur, enhancing the overall yield and reducing maintenance costs of the display panel.
Implementation Method 1
a semiconductor single-walled carbon nanotube (s-SWCNT) material has characteristics of high mobility
Data Source
AI summary
The present disclosure provides a pixel driving circuit, an array substrate and a display panel. The pixel driving circuit of the present disclosure includes a switch transistor and N redundant switch transistors, the switch transistor and the N redundant switch transistors are connected in series, a second electrode of an Nth redundant switch transistor is coupled to a first electrode of the switch transistor, and a second electrode of the switch transistor is coupled to a display electrode.