Gate Driving Circuit Alternating Buffer Transistors
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Solution Overview
Problem
The gate driving circuit in display devices experiences stress on buffer transistors due to high voltage application and prolonged drive time, leading to reduced reliability.
Innovation Solution
A gate driving circuit is designed with signal transmitters that charge or discharge control nodes to alternately drive transistors, reducing stress on buffer transistors by dispersing the stress over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a buffer transistor is used to output gate pulses in a gate driving circuit, then the circuit can drive the switch elements effectively, but the buffer transistor experiences high stress due to high voltage application and prolonged drive time, reducing reliability
Solution Approach 1:
The buffer transistor is divided into multiple transistors (first buffer transistor and second buffer transistor) that operate alternately. Each transistor handles the driving task for only half of the driving period, segmenting the stress and duty cycle to improve individual transistor reliability while maintaining overall driving capability.
Solution Approach 2:
The invention implements periodic switching between the first and second buffer transistors using alternating high and low signals. The transistors are turned on and off in alternating periods, allowing each transistor to rest during the other's active period, thereby reducing cumulative stress and heat generation.
2Device complexity
If a single transistor handles the gate signal output continuously, then the circuit structure remains simple, but the transistor deteriorates faster due to prolonged drive time and high voltage stress
Solution Approach 1:
The continuous driving task is segmented into alternating intervals handled by different transistors. The first buffer transistor operates during high signal periods while the second operates during low signal periods, reducing the continuous drive time for each individual transistor.
Solution Approach 2:
The invention introduces dynamic switching between static transistors, where the active transistor changes periodically based on the signal phase. This dynamic allocation of driving tasks allows transistors to alternate between active and idle states, extending their operational lifespan.
Data Source
AI summary
Provided are a gate driving circuit and a display device including the same. The gate driving circuit includes a first controller configured to control a first control node to act as a pull-up control node to turn on a first transistor when an activation clock is input to the first controller for a first unit time, and to be deactivated when a deactivation clock is input thereto for a second unit time; and a second controller configured to control a second control node to act as a pull-up control node to turn on a second transistor when the activation clock is input to the second controller for the second unit time, and to be deactivated when the deactivation clock is input thereto for the first unit time.