Display Driving Device Abnormal Power Off Charge Discharge
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Solution Overview
Problem
Existing display driving devices face issues with residual electric charges in pixels leading to flickering and afterimage effects when power is abnormally disrupted, such as during sudden battery removal or blackouts, as these charges are not effectively removed.
Innovation Solution
A display driving device with a power circuit to generate gate supply voltages, a gate driver to apply a gate driving signal, and a controller to control the power circuit, allowing the gate supply voltages to be naturally discharged when abnormal power off occurs, thereby removing residual electric charges from pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If residual electric charges are not discharged from pixels during abnormal power off, then the display can operate continuously without active discharge mechanisms, but flickering and afterimage effects occur when power is disrupted
Solution Approach 1:
The gate driver is configured to automatically set the gate driving signal to gate supply voltages when abnormal power off is detected, performing the discharge action in advance before the harmful effects manifest. This preliminary action prevents residual charges from causing flickering and afterimage effects during subsequent power restoration
Solution Approach 2:
The invention converts the harmful residual electric charges into a beneficial discharge current by utilizing the gate supply voltages applied through the gate driver. The residual charges naturally discharge through the gate lines when the gate driving signal is set to gate supply voltages, transforming the harmful effect into a self-discharging mechanism
2Object-affected harmful factors
If active discharge circuits are added to remove residual charges, then flickering and afterimage effects are prevented, but device complexity increases
Solution Approach 1:
The gate driver performs multiple functions: normal display operation during powered state and automatic discharge of residual charges during abnormal power off. By configuring the gate driver to set the gate driving signal to gate supply voltages under abnormal conditions, the same circuit component handles both display driving and charge discharge functions, eliminating the need for separate discharge circuits
Solution Approach 2:
The display system uses its own existing gate supply voltages and gate driver to discharge residual charges from pixels, without requiring external discharge circuits or additional power management components. The system serves itself by utilizing internal resources for the discharge function
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
Prevents flickering and afterimage effects by effectively discharging residual electric charges in pixels during abnormal power off scenarios, ensuring stable display operation when power is restored.
Implementation Method 1
control the power circuit to allow the gate supply voltages to be discharged naturally
Data Source
AI summary
A display driving device includes a power circuit, a gate driver, a data driver, and a controller. The power circuit generates gate supply voltages. The gate driver applies a gate driving signal to gate lines. The data driver applies data signals to data lines intersecting the gate lines. The controller controls the power circuit, the gate driver, and the data driver to set the gate driving signal to be at least one of the gate supply voltages when abnormal power off occurs. The controller also controls the power circuit to allow the gate supply voltages to be discharged naturally.