Gate Drive Circuit Reset Timing Adjustment

Resolve Bottlenecks,
Find Innovative Solutions
Generate Solutions

Solution Overview

Problem

Conventional gate driving circuits in TFT-LCDs experience a flash screen phenomenon due to extremely short reset times of shift register units, leading to poor display performance and low yield.

Innovation Solution

The phase relationship of clock signals and reset signals is adjusted in the cascading stages of shift register units within the gate driving circuit, extending the reset time without modifying the structure of the conventional shift register units, thereby alleviating the flash screen phenomenon.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If multiple clocks are used in the gate driving circuit, then the scanning speed is improved, but the flash screen phenomenon occurs due to extremely short reset time

Engineering Contradiction:
Improvescanning speedVSAvoiddisplay quality
Core Design Contradiction:
SpeedVSReliability

Solution Approach 1:

The patent applies dynamics by making the reset time adjustable rather than fixed. By controlling the reset signal timing dynamically based on the clock phase relationships, the system can adapt the reset duration to prevent flash screen while maintaining high scanning speed. The reset signal is generated with a controlled delay relative to the clock signal, allowing optimization of both speed and reliability.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of reset time by adjusting the phase relationship between clock signals and reset signals. Specifically, the reset signal is delayed by a controlled amount of time relative to the clock signal, transforming the fixed extremely short reset time into an adjustable parameter that can be optimized to prevent flash screen while maintaining fast scanning operation.

Inventive Principle:
Principle #35Parameter changes

2Reliability

If the reset time is extended to prevent flash screen, then display quality is improved, but the scanning speed decreases

Engineering Contradiction:
Improvedisplay qualityVSAvoidscanning speed
Core Design Contradiction:
ReliabilityVSSpeed

Solution Approach 1:

The system dynamically adjusts the reset signal timing based on clock phase relationships. By making the reset time variable rather than fixed, the patent can optimize the balance between display quality and scanning speed. The reset signal is generated with a controlled delay that can be adjusted to achieve the optimal trade-off point.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent utilizes periodic action by synchronizing the reset signal with the clock signal cycles. The reset signal is generated periodically based on the clock rhythm, creating a regular pattern that allows predictable timing control. This periodic generation enables precise control of reset duration to prevent flash screen while maintaining efficient scanning operation.

Inventive Principle:
Principle #19Periodic action

Data Source

PatentEP3709287B1Gate drive circuit and drive method therefor, and display device
Publication Date: 2024.03.06 BOE TECHNOLOGY GROUP CO LTD
  • EP3709287B1 patent drawingFigure 1
  • EP3709287B1 patent drawingFigure 2
  • EP3709287B1 patent drawingFigure 3

AI summary

Embodiments of the present disclosure disclose a gate driving circuit, a method for driving the same, and a display apparatus. The gate driving circuit includes N stages of cascaded shift registers, N being an integer greater than or equal to 4. In the N stages of shift registers, an output signal terminal of an nth stage of shift register is connected to an input signal terminal of an (n+I/2)th stage of shift register, and a reset signal terminal of the nth stage of shift register is connected to an output signal terminal of an (n+K)th stage of shift register, wherein n is an integer greater than or equal to 1 and less than (N-I/2), K is an integer greater than I/2 and less than I, and I is a number of clock signal lines connected to the gate driving circuit, which is an even number greater than or equal to 4.