Display Panel Power-Off Discharge Circuit for Afterimage Prevention
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Solution Overview
Problem
Existing display panel power-off mechanisms inadequately discharge pixel electrodes, leading to afterimages due to insufficient discharging time caused by rapid voltage drop during power-off stages, where the power management integrated circuit supplies high-level voltage for a short duration.
Innovation Solution
A power-off discharge circuit that includes a switching circuit, power storage circuit, and discharge circuits to control connections between transmission lines and data lines, allowing extended discharge of pixel electrodes by maintaining an active level output from the gate driving circuit after the power management integrated circuit stops supplying voltage, using transistors, resistors, and capacitors to manage voltage and current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the power management integrated circuit supplies voltage rapidly during power-off, then the power-off process is efficient, but the pixel electrodes are not sufficiently discharged causing afterimages
Solution Approach 1:
The discharge circuit is activated in advance before the power management integrated circuit completely shuts down. The control circuit detects the power-off state and proactively enables the discharge circuit to maintain voltage on the gate driving circuit, ensuring pixel electrodes are fully discharged before power is completely removed, thus preventing afterimages while maintaining efficient power-off speed.
Solution Approach 2:
The control circuit acts as an intermediary between the power management integrated circuit and the gate driving circuit. During power-off, it detects the power state and activates the discharge circuit to bridge the gap, maintaining necessary voltage levels on the gate driving circuit even after the power management integrated circuit shuts down, thereby ensuring complete discharge of pixel electrodes.
2Reliability
If the power management integrated circuit supplies voltage for a longer duration, then pixel electrodes can be fully discharged, but the power consumption increases
Solution Approach 1:
The discharge circuit is activated in advance before the power management integrated circuit completely shuts down. The control circuit detects the power-off state and proactively enables the discharge circuit to maintain voltage on the gate driving circuit, ensuring pixel electrodes are fully discharged before power is completely removed, thus preventing afterimages while maintaining efficient power-off speed.
Solution Approach 2:
The discharge circuit is automatically controlled by the control circuit based on power-off detection. The system self-regulates by detecting when the power management integrated circuit shuts down and automatically activating the discharge circuit, eliminating the need for extended voltage supply from the power management integrated circuit and reducing overall power consumption.
3Measurement precision
If additional control signal lines are added to manage discharge timing, then discharge control precision is improved, but the circuit complexity increases
Solution Approach 1:
The control circuit performs multiple functions: it detects the power-off state of the power management integrated circuit, determines when to activate the discharge circuit, and controls the timing of discharge operations. By consolidating these control functions into a single multi-functional control circuit, the design achieves precise discharge control without adding multiple separate control signal lines, thus maintaining low circuit complexity.
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
Ensures sufficient discharge of pixel electrodes, preventing afterimages by prolonging the turned-on duration of display transistors during power-off stages without requiring additional control signal lines, thus enhancing discharge efficiency.
Implementation Method 1
a power storage circuit, coupled to the first transmission line and configured to perform, in response to a power control signal, one of storing power transmitted from the first transmission line and supplying stored power to the first transmission line
Data Source
AI summary
A power-off discharge circuit and an operation method of a display panel, and a display substrate are provided. The power-off discharge circuit includes a switching circuit and a power storage circuit. The switching circuit is coupled to the first transmission line and the second transmission line and configured to control a connection between the first transmission line and the second transmission line in response to a first control signal, and to control a connection between the second output terminal of the power management circuit and the second input terminal of the gate driving circuit in response to a second control signal. The power storage circuit is coupled to the first transmission line and configured to perform, in response to a power control signal, one of storing power transmitted from the first transmission line and supplying stored power to the first transmission line.