Mobile Terminal Display Panel Driver Charge Discharge Circuit
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Solution Overview
Problem
Mobile terminals face issues with abnormal shutdowns due to sudden power cutoffs from power storage devices, leading to residue charge in display panels, which can cause burn-in and abnormal displays.
Innovation Solution
A mobile terminal configuration that includes a display panel with source and gate lines, a power storage device, a power circuit, gate and source line driving sections, a regulator, and a logic circuit to control the discharge of charge from the display panel when power is cut off, utilizing a charge transport path and bypass capacitors to maintain voltage and ensure proper shutdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power supply from the power storage device is suddenly cut off, then the system operation stops, but charge residue remains in the display panel causing burn-in and abnormal display
Solution Approach 1:
The logic circuit detects voltage drops on power supply lines before complete power cutoff occurs, and proactively activates the discharge operation by controlling the source line driving section and gate line driving section to discharge charge from the display panel, preventing burn-in before it can occur
Solution Approach 2:
The logic circuit continuously monitors the voltage levels of power supply lines through detection circuits, and based on this feedback information, dynamically controls the discharge operation of the display panel to ensure charge is removed during abnormal shutdown conditions
2Reliability
If a logic circuit controls discharge operation during power cutoff, then charge residue is eliminated, but additional circuit components and complexity are required
Solution Approach 1:
The logic circuit serves multiple functions: it controls normal display operations during powered state, detects abnormal power conditions through voltage monitoring, and activates discharge operations during shutdown, making a single circuit component perform multiple critical functions
Solution Approach 2:
The detection circuits for monitoring power supply voltage are integrated within the logic circuit, and the discharge control functionality is combined with the existing source line and gate line driving sections, merging multiple functions into unified circuit structures
Data Source
AI summary
A power circuit section generates a first logic power supply voltage and an analog power supply voltage to supply to a first power supply line and a second power supply line, respectively. A regulator steps the first logic power supply voltage down to generate a second logic power supply voltage and supplies the second logic power supply voltage to a third power supply line. A logic circuit controls A source line driving section and A gate line driving section in response to a decrease of a voltage of the first power supply line so that the charge stored in the display panel is discharged. A charge transporting path is configured to transport the charge from the second power supply line to a third power supply line in response to the decrease of the voltage of the first power supply line.