Scan Driver Gate Voltage Control for Display Panel Discharge
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Solution Overview
Problem
Display devices face instability and potential damage due to inrush current during discharging, which can cause burnt issues at vulnerable parts, primarily attributed to peak current fluctuations.
Innovation Solution
Implementing a display device with a scan driver that applies a second gate high voltage lower than the initial gate high voltage during discharging, controlled by a logic controller and voltage converter, to reduce peak current and prevent inrush current-related damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display panel is discharged using the initial gate high voltage, then the discharging operation can be performed, but peak current occurs causing inrush current and potential damage to vulnerable parts
Solution Approach 1:
The patent applies parameter changes by modifying the gate high voltage level during the discharging operation. Specifically, the scan driver uses a second gate high voltage that is lower than the initial gate high voltage when discharging the display panel. This voltage parameter adjustment reduces the peak current during discharge, thereby preventing inrush current and protecting vulnerable components while maintaining reliable discharging operation.
2Object-affected harmful factors
If the gate high voltage is reduced during discharging, then peak current and inrush current are reduced, but the discharging operation may be delayed
Solution Approach 1:
The patent implements preliminary action by detecting the power supply state before initiating the discharging operation. The logic controller monitors whether the power supply is in a powered-off state and only initiates discharge when appropriate conditions are met. This preliminary check ensures that the voltage reduction strategy is applied only when necessary, optimizing both current protection and discharge timing.
3Productivity
If the scan driver simultaneously switches scan signals during discharge, then discharging can be achieved, but inrush current occurs at vulnerable parts
Solution Approach 1:
The patent resolves this contradiction by changing the voltage parameter during the discharge process. The scan driver applies a second gate high voltage (lower than the initial voltage) while simultaneously switching scan signals, which maintains discharge functionality while reducing peak current. This parameter adjustment allows the system to achieve discharging speed without generating harmful inrush current at vulnerable parts.
Data Source
AI summary
A display device includes a display panel displaying an image, a scan driver configured to apply scan signals to the display panel, and a power supply configured to apply a gate high voltage and a gate low voltage to the scan driver. The scan driver discharges the display panel based on a second gate high voltage lower than the gate high voltage during a discharging operation of the display panel.