Gate Driving Circuit Noise Cancellation Between Adjacent Stages
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Solution Overview
Problem
Prior art amorphous silicon gate (ASG) circuits fail to effectively control noise at high temperatures, leading to abnormal gate-on signals and display defects in liquid crystal displays (LCDs) due to noise generated during the gate-off period.
Innovation Solution
A method and switching circuit that electrically connects and disconnects the terminals of adjacent stages with opposite noise components during specific periods to cancel out noise, utilizing a switching circuit with multiple stages and noise removing circuits integrated in the gate driving circuit to manage noise effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If prior art ASG circuits use holding sections to decrease noise, then noise during gate-off period is reduced, but noise cannot be effectively controlled at high temperatures resulting in abnormal gate-on signals
Solution Approach 1:
The gate driving circuit is divided into multiple stages, with each stage independently controlling noise cancellation for specific time periods. The switching circuit segments the noise control function across different stages (first stage, second stage, third stage) that operate during different periods (first period, second period, third period) to effectively cancel noise at high temperatures without causing abnormal gate-on signals.
Solution Approach 2:
The switching circuit dynamically connects and disconnects adjacent stages based on time periods and temperature conditions. The circuit transitions between different operational states (connecting during first period, disconnecting during second period, connecting during third period) to adapt to high temperature conditions and maintain reliable noise control.
2Object-affected harmful factors
If a switching circuit with multiple stages is used to cancel noise, then noise removal effectiveness is improved, but device complexity increases
Solution Approach 1:
The noise removing circuit merges the switching elements of adjacent stages into a unified control structure. Multiple switching elements are integrated into a single noise removing circuit that coordinates their operation, reducing overall device complexity while maintaining effective noise cancellation across all stages.
Solution Approach 2:
The switching circuit elements serve multiple functions: they control signal transmission, manage noise cancellation, and adapt to different temperature conditions. Each switching element operates during different periods to achieve both signal routing and noise removal, reducing the need for separate dedicated circuits.
Data Source
AI summary
A method for removing noise of a gate signal that is outputted from a gate driving circuit including a plurality of stages, the method includes electrically connecting two terminals of two adjacent stages that have noise components opposite in phase to each other during a first period, and electrically disconnecting the two terminals of the two adjacent stages that have the noise components opposite in phase to each other during a second period.