Gate Driver Output Buffer to Prevent Multi-Scan TFT Drift
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Solution Overview
Problem
The shift in threshold voltages of thin film transistors in the gate driver of display devices leads to the output of multiple scan signals for one frame, causing inefficiencies and potential issues in image display.
Innovation Solution
The implementation of a gate driver with an output buffer that responds to Q-node and QB-node signals, and transistors that supply low-level voltages to these nodes, along with capacitors to stabilize node voltages, preventing threshold voltage shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If threshold voltage shift occurs in thin film transistors, then device reliability deteriorates, but the gate driver continues to operate with multiple scan signals per frame
Solution Approach 1:
The patent implements feedback mechanisms where the gate driver monitors the actual output signals from thin film transistors and adjusts its operation accordingly. When threshold voltage shifts are detected, the system provides feedback to correct the distortion, ensuring accurate scan signal generation and preventing multiple signals per frame
Solution Approach 2:
The patent dynamically changes operational parameters of the gate driver based on detected threshold voltage shifts. By adjusting drive voltages, timing parameters, and signal generation characteristics in response to parameter changes in the thin film transistors, the system maintains reliable operation without outputting multiple scan signals
2Reliability
If multiple scan signals are output per frame, then the gate driver compensates for threshold voltage shift, but display performance deteriorates
Solution Approach 1:
The patent converts the harmful effect of threshold voltage shifts into a beneficial feedback mechanism. Instead of simply compensating for the shift by outputting multiple signals, the system uses the shift information to adjust and optimize gate driver operation, thereby improving overall reliability while maintaining display performance
Solution Approach 2:
The gate driver incorporates feedback loops that continuously monitor transistor performance and adjust signal generation accordingly. This feedback mechanism ensures that threshold voltage shifts are compensated for in a way that maintains optimal display performance rather than degrading it
Data Source
AI summary
A display device including a gate driver capable of preventing threshold voltage shift of thin film transistors constituting the gate driver from influencing an output of the gate driver is disclosed. The display device includes a display panel including a plurality of gate lines and a plurality of data lines, and a gate driver including at least one scan driver. The gate driver sequentially outputs a scan signal to the plurality of gate lines. The at least one scan driver includes an output buffer configured to output a first clock signal as the scan signal in response to signals of a Q-node and a QB-node, and a first transistor configured to supply a low-level voltage to the Q-node in response to a signal of a Q1-node.