Shift Register Unit With Threshold Voltage Control For Noise Reduction

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Solution Overview

Problem

Conventional gate driving circuits face challenges in reducing power consumption while maintaining pixel brightness stability, especially at ultra-low refresh frequencies, where noise in the scan signal output affects pixel display.

Innovation Solution

The implementation of a shift register unit with a dual-gate transistor output circuit, where the threshold voltage of transistors can be adjusted using threshold voltage control signals, reduces noise by optimizing transistor conduction and leakage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If the refresh frequency is reduced to lower power consumption, then power consumption is reduced, but noise in the scan signal output increases and affects pixel display

Engineering Contradiction:

Improvepower consumptionVSAvoidnoise in scan signal

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent changes the operating parameters of the transistor by applying a threshold voltage control signal to dynamically adjust the threshold voltage. This allows the circuit to maintain stable output at ultra-low refresh frequencies by optimizing the transistor's conduction characteristics without increasing power consumption

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces dynamic control of the threshold voltage through a control signal that can adjust the transistor's threshold voltage in real-time. This dynamic adjustment enables the circuit to adapt to ultra-low refresh frequency operation and suppress noise while maintaining low power consumption

Inventive Principle:

Principle #15Dynamics

2Object-affected harmful factors

If the threshold voltage of transistors is adjusted to reduce noise, then noise is reduced, but the gate voltage of transistors would normally need to be altered

Engineering Contradiction:

Improvenoise in output signalVSAvoidvoltage control mechanism

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent separates the gate voltage control into two independent parts: a fixed gate voltage for normal operation and a separate threshold voltage control signal for noise suppression. This segmentation allows the threshold voltage to be adjusted without affecting the main gate voltage, enabling noise reduction while maintaining operational simplicity

Inventive Principle:

Principle #1Segmentation

Data Source

PatentEP4141855B1Shift register unit and driving method therefor, gate drive circuit and display device

Publication Date: 2025.02.19 BOE TECHNOLOGY GROUP CO LTD

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AI summary

A shift register unit and a method for driving the same, a gate driving circuit, and a display device. The shift register unit includes: a control circuit (10) coupled to an input signal terminal (IN), a clock signal terminal (CLK), and an output control terminal (GP), and configured to provide an output control signal to the output control terminal (GP) based on a signal from the input signal terminal (IN) and a signal from the clock signal terminal (CLK); and an output circuit (20) coupled to the output control terminal (GP), an output signal terminal (GO), and a threshold voltage control terminal (DG), and configured to provide an output signal to the output signal terminal (GP) under control of a potential at the output control terminal (GP), and adjust a threshold voltage of at least one of a plurality of transistors in the output circuit (20) under control of a signal from the threshold voltage control terminal.