Sequential Gate Voltage Control for Display Inrush Current Reduction
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Solution Overview
Problem
Display devices face the risk of gate driving circuit burnout due to large inrush currents when powered down or shut down, as existing methods involve simultaneously applying normal turn-on voltage to all gate lines.
Innovation Solution
Divide the display region into sub-regions and sequentially apply turn-on voltage to each sub-region's gate lines, while setting the data lines to a grayscale value of 0 to prevent residual images and reduce inrush current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gate driving circuit simultaneously inputs normal turn-on voltage to all gate lines during shutdown, then the display image becomes black (solving image residual), but large inrush current is generated causing gate driving circuit burnout risk
Solution Approach 1:
The patent divides the display region into multiple sub-regions and applies turn-on voltage to gate lines in each sub-region sequentially rather than simultaneously. This segmentation approach splits the total inrush current into multiple smaller current pulses occurring at different times, preventing the gate driving circuit from being overloaded while still achieving complete black display coverage.
Solution Approach 2:
The patent applies turn-on voltage to gate lines in a predetermined sequential order across different sub-regions before the complete shutdown process finishes. This preliminary staged activation ensures that not all pixel circuits are activated at the same moment, thereby preventing the simultaneous inrush current surge that would otherwise occur with simultaneous activation of all gate lines.
2Speed
If the gate driving circuit simultaneously inputs normal turn-on voltage to all gate lines, then the display image becomes black quickly, but the gate driving circuit is at risk of being burned down
Solution Approach 1:
The display region is divided into multiple sub-regions with gate lines activated in sequence. This segmentation maintains relatively fast shutdown performance by activating regions in rapid succession, while preventing gate driving circuit burnout by ensuring that the total current load never exceeds safe limits during the transition period.
Solution Approach 2:
The patent employs periodic sequential activation of gate lines across different sub-regions during shutdown. Instead of a single simultaneous activation event, the system uses multiple periodic activation pulses spaced in time, each activating a portion of the gate lines. This periodic approach maintains effective shutdown speed while distributing the electrical stress over time to protect the gate driving circuit.
Data Source
AI summary
A display method for a display device and the display device are provided. The display device includes multiple gate lines and multiple data lines, each of the gate lines extends in a row direction, and each of the data lines extends in a column direction. The method includes: dividing a display region of the display device into multiple sub-regions, where each of the sub-regions includes all of the data lines in the row direction and includes at least one of the gate lines in the column direction; controlling, when the display device is shut down or powered down, a gate driving circuit of the display device to input a turn-on voltage into the gate lines in each of the sub-regions one by one; and controlling a source driving circuit of the display device to input a voltage corresponding to a grayscale value of 0 to each of the data lines.