Shift Register Unit Reset Signal Amplitude for Noise Reduction
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Solution Overview
Problem
Shift register units in Gate Driver on Array (GOA) technology for display panels face issues with insufficient noise reduction at pull-up nodes, leading to multi-output phenomena, especially in low temperature environments due to reduced channel current of noise reduction transistors, affecting image display quality.
Innovation Solution
The proposed shift register unit incorporates an input circuit, output circuit, first reset circuit, and reset control circuit, with a reset control circuit that adjusts the amplitude of the reset signal to ensure sufficient noise reduction by enabling the first reset circuit to be fully turned on, even in low temperature conditions, thereby preventing multi-output phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If noise reduction transistors are used to reduce noise at pull-up nodes, then noise reduction capability is improved, but in low temperature environments the channel current decreases causing insufficient noise reduction
Solution Approach 1:
The patent changes the voltage level parameter of the reset signal to a higher level, which increases the gate-source voltage of the reset transistor. This parameter change ensures that even in low temperature environments where channel current is reduced, the reset transistor remains fully turned on and maintains effective noise reduction capability at the pull-up node.
Solution Approach 2:
The reset circuit is activated before the shift register unit operates in the low temperature environment. By preliminarily resetting the pull-up node with a high-level reset signal, the circuit prepares the transistor in a fully conductive state, ensuring noise reduction effectiveness is established before temperature-related current reduction occurs.
2Object-affected harmful factors
If the reset circuit is fully turned on to ensure sufficient noise reduction, then noise reduction capability is improved, but circuit complexity increases
Solution Approach 1:
Instead of adding complex control mechanisms, the patent simply changes the voltage level parameter of the reset signal. This single parameter modification achieves full transistor turn-on and effective noise reduction without increasing circuit complexity, as it leverages the existing reset circuit structure with an optimized signal level.
Data Source
AI summary
A shift register unit, a method of driving a shift register unit, a gate drive circuit, and a display device are provided. The shift register unit includes an input circuit, an output circuit, a first reset circuit, and a reset control circuit. The input circuit is configured to control a level of a first node; the output circuit is configured to output a clock signal to an output terminal; the first reset circuit is configured to reset the first node; and the reset control circuit is configured to input the first reset signal to the first reset circuit in response to a reset control signal and a reference signal, to turn on the first reset circuit and the reset control circuit is further configured to enable an amplitude of a level of the first reset signal to be larger than an amplitude of a level of the reference signal.