Gate On-State Voltage Boosting for LCD Flickering Prevention
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Solution Overview
Problem
In Liquid Crystal Display (LCD) panels with Gate on Array (GOA) circuits, long-term aging can cause drift in Thin Film Transistor (TFT) characteristics, leading to insufficient gate on-state voltage for turning on TFTs when the panel is powered off, resulting in residual charges and flickering issues due to incomplete charge release.
Innovation Solution
A gate on-state voltage supply unit comprising a shutdown determination module and a voltage supply module that boosts the gate on-state voltage when the display device is shut down, ensuring all TFTs can be turned on and charges fully released, preventing flickering by applying a boosted voltage to the gate driving circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gate on-state voltage is maintained at normal operating levels, then the display device operates normally during operation, but the voltage is insufficient to turn on all TFTs in the GOA units when the display panel is powered off, resulting in incomplete charge release and flickering
Solution Approach 1:
The patent applies preliminary action by detecting the shutdown state of the display device before complete power off occurs, and proactively boosting the gate on-state voltage to ensure all TFTs are turned on and charges are completely released. The shutdown determination module monitors the core voltage from the power source management integrated circuit, and when shutdown is detected, the voltage supply module boosts the gate on-state voltage in advance before residual charges can cause flickering issues.
2Reliability
If the gate on-state voltage is boosted to ensure complete charge release, then flickering is prevented, but additional voltage boosting circuitry and control mechanisms are required
Solution Approach 1:
The patent applies universality by designing the voltage supply module to perform dual functions: during normal operation, it supplies standard gate on-state voltage to the gate driving circuit, and during shutdown, it boosts the gate on-state voltage to ensure complete charge release. This multi-functional design eliminates the need for separate boosting circuits, reducing overall device complexity while maintaining reliability.
Solution Approach 2:
The patent implements feedback through the shutdown determination module that continuously monitors the core voltage from the power source management integrated circuit. When the core voltage indicates shutdown state, the module provides feedback by generating a control signal to trigger the voltage boosting operation, ensuring the gate on-state voltage is adjusted appropriately based on the actual power state of the display device.
3Adaptability or versatility
If the display device is powered off frequently or abnormally, then power management flexibility is improved, but residual charges remain in the display panel causing flickering due to insufficient voltage for complete charge release
Solution Approach 1:
The patent applies preliminary anti-action by detecting the shutdown state before complete power off occurs and proactively boosting the gate on-state voltage to prevent the accumulation of residual charges. The shutdown determination module monitors the core voltage and, upon detecting shutdown, triggers the voltage supply module to boost the gate on-state voltage in advance, counteracting the potential harmful effect of incomplete charge release that would otherwise occur during frequent or abnormal power cycling.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents flickering by ensuring complete charge release and maintaining proper TFT operation, even after frequent power cycling or abnormal shutdowns, by boosting the gate on-state voltage when the display device is powered off.
Implementation Method 1
the voltage supply module is configured to, upon the receipt of the boosting control signal, boost a gate on-state voltage to acquire a boosted gate on-state voltage
Data Source
AI summary
The present disclosure provides a gate on-state voltage supply unit, a gate on-state voltage supply method, a display driving module and a display device. The gate on-state voltage supply unit is used in the display device including a display driving module. The gate on-state voltage supply unit includes a shutdown determination module and a voltage supply module. The shutdown determination module is configured to determine whether the display device has been shut down, and when the display device has been shut down, transmit a boosting control signal to the voltage supply module. The voltage supply module is configured to, upon the receipt of the boosting control signal, boost a gate on-state voltage to acquire a boosted gate on-state voltage, and apply the boosted gate on-state voltage to a gate driving circuit of the display driving module.