Gate Driving Circuit Ripple Preventer for Display Noise Reduction
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Solution Overview
Problem
Existing gate driving circuits in liquid crystal displays suffer from reliability issues due to noise generation and signal distortion, particularly at high temperatures, which affect the display quality and operational margin.
Innovation Solution
The proposed gate driving circuit incorporates a ripple preventer with a diode and transistor configuration to prevent noise transmission to the inverter, enhancing the reliability and quality of the gate signal by using a pull-up unit, pull-down unit, holder, and inverter, along with a ripple preventer diode and transistor, to manage clock signals and prevent signal ripples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional gate driving circuit with inverter is used, then the gate signal can be turned on/off, but noise is generated and signal distortion occurs particularly at high temperatures
Solution Approach 1:
A ripple preventer circuit is introduced as an intermediary component between the gate line and the inverter. This ripple preventer includes a ripple preventing diode with anode connected to the gate line and cathode connected to the inverter input, and a ripple preventing transistor that controls the diode's operation. The ripple preventer blocks noise and ripple signals from reaching the inverter while allowing valid gate signals to pass through, thereby resolving the contradiction between maintaining inverter functionality and preventing noise generation at high temperatures.
Solution Approach 2:
The harmful ripple and noise components are extracted and isolated from the main signal path by the ripple preventer circuit. The ripple preventing diode and transistor combination selectively removes the high-frequency noise components while preserving the useful gate drive signals, thus taking out the harmful factors without affecting the overall gate driving function.
2Ease of operation
If the inverter is coupled directly to the gate line, then the holder can be controlled, but distorted signals are generated at the next stage gate signal
Solution Approach 1:
The ripple preventer serves as a mediator between the gate line and the inverter-input holder control circuit. It allows the holder to be properly controlled for on/off functionality while simultaneously filtering out distorted signals and noise that would otherwise propagate to the next stage, thus maintaining both ease of operation and signal integrity.
3Device complexity
If noise is not prevented, then the circuit structure remains simple, but the display quality and operational margin are affected
Solution Approach 1:
A relatively simple ripple preventer circuit consisting of a diode and transistor is introduced as an intermediary component. This adds minimal complexity to the overall circuit structure while effectively preventing noise and ripple signals from degrading display quality and operational margin, thus resolving the contradiction between circuit simplicity and display quality.
Data Source
AI summary
A gate driving circuit and a display device having the same, a pull-up unit pulls up a current gate signal by using a first clock signal during a first period of one frame. A pull-up driver coupled to the pull-up unit receives a carry signal from one of the previous stages to turn on the pull-up unit. A pull-up unit receives a gate signal from one of the next stages, discharges the current gate signal to an off voltage level, and turns off the pull-up unit. A holder holds the current gate signal at the voltage level. An inverter turns on/off the holder in response to a first clock signal. A ripple preventer has a source and a gate coupled in common to an output terminal of the pull-up unit and a drain coupled to an input terminal of the inverter, and includes a ripple preventing diode for preventing a ripple from being applied to the inverter.