ESD Circuit TFT Channel Length Design for Leakage Current Reduction
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Solution Overview
Problem
In display devices, the deterioration of thin film transistors (TFTs) in electrostatic discharge (ESD) circuits over time leads to a shift in threshold voltage, causing leakage currents even in normal operating conditions, which reduces image luminance and increases power consumption.
Innovation Solution
The design increases the resistance value of the TFTs in the ESD circuits by forming a channel length greater than the channel width, preventing leakage currents from flowing in normal states and ensuring static electricity is effectively managed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the channel length of TFT in ESD circuit is made greater than channel width to increase resistance, then leakage current is reduced, but the ability to discharge static electricity may be compromised
Solution Approach 1:
The patent applies parameter changes by specifically setting the channel length to be greater than the channel width of the TFT in the ESD circuit. This dimensional parameter change increases the resistance of the TFT, thereby reducing leakage current during normal operation while maintaining the ability to discharge static electricity when needed.
2Duration of action of stationary object
If TFT threshold voltage shifts due to deterioration over time, then ESD circuit remains functional, but leakage current increases and image luminance decreases
Solution Approach 1:
The patent applies preliminary action by designing the TFT with a channel length greater than channel width from the beginning, which pre-establishes a higher resistance state that compensates for future threshold voltage shifts due to deterioration. This preliminary structural design ensures that even as the TFT degrades over time, the resistance remains sufficiently high to minimize leakage current and maintain image quality.
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 approach reduces leakage currents, maintains image quality, and minimizes power consumption by preventing unnecessary current flow through the data lines, even as TFTs deteriorate.
Implementation Method 1
The design increases the resistance value of the TFTs in the ESD circuits by forming a channel length greater than the channel width
Implementation Method 2
an ESD circuit that prevents static electricity from occurring or prevents a damage caused by the static electricity
Data Source
AI summary
Disclosed is a display device. The display device includes a panel in which a plurality of pixels are respectively formed in a plurality of pixel areas defined by intersections between a plurality of gate lines and a plurality of data lines, a source driving IC coupled to the plurality of data lines in a first non-display area of the panel and configured to respectively supply data voltages to the plurality of data lines, and an ESD circuit in which, to prevent static electricity from flowing into the plurality of data lines, in the first non-display area, a end of one side of the ESD circuit is coupled to a corresponding data line, a end of the other side is coupled to a power line, and a length of a channel through which a current flows is formed greater than a width of the channel.