OLED Drive Circuit Voltage Stabilization via Threshold Detection
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Solution Overview
Problem
Organic Light-Emitting Diode (OLED) displays experience instability and screen flickering due to unstable power-supply and data voltages during startup and shutdown, affecting the service life and user experience.
Innovation Solution
A drive circuit with a voltage output module, including a detection module and an isolation module, regulates voltage signals by determining if they exceed a preset threshold, controlling the electrical coupling between input and output terminals to prevent unstable voltage outputs, thereby stabilizing the power-supply and data voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the capacitor is charged when powering the display on, then the power-supply voltage can be generated, but a relatively large capacitive charging current is generated causing voltage instability and affecting OLED service life
Solution Approach 1:
The detection module detects the voltage value before the voltage output module outputs the voltage signal. When the voltage value is less than the preset voltage threshold, the isolation module breaks the electrical coupling in advance, preventing unstable voltage from reaching the display panel and causing screen flickering.
Solution Approach 2:
The isolation module acts as an intermediary between the voltage input terminal and the voltage output terminal. It conditionally conducts or breaks electrical coupling based on the detection module's output, mediating the transmission of voltage signals to prevent instability from affecting the display panel.
2Loss of time
If the capacitor is discharged when shutting the display down, then the power-supply voltage line voltage can be zeroed, but screen flickering occurs due to residual voltage superimposed with residual charge in drive circuit
Solution Approach 1:
The detection module detects the voltage value before the voltage output module outputs the voltage signal. When the voltage value is less than the preset voltage threshold, the isolation module breaks the electrical coupling in advance, preventing unstable voltage from reaching the display panel and causing screen flickering.
Solution Approach 2:
The isolation module acts as an intermediary between the voltage input terminal and the voltage output terminal. It conditionally conducts or breaks electrical coupling based on the detection module's output, mediating the transmission of voltage signals to prevent instability from affecting the display panel.
3Reliability
If the detection module outputs control signals to control the isolation module, then unstable voltage outputs are prevented, but the device complexity increases
Solution Approach 1:
The detection module automatically detects the voltage value and generates control signals based on the detected voltage, eliminating the need for external control circuits. The system serves itself by using the voltage detection to automatically control the isolation module's electrical coupling state.
Solution Approach 2:
The detection module continuously monitors the voltage value and provides feedback control signals to the isolation module. When the voltage value is less than the preset threshold, the isolation module breaks coupling; when the voltage value exceeds the threshold, the isolation module conducts, creating a feedback control mechanism.
Data Source
AI summary
A drive circuit of a display panel and a display device are provided in the disclosure. The drive circuit includes a voltage output module. The voltage output module includes a voltage input terminal, a voltage output terminal, a detection module, and an isolation module. The voltage input terminal is configured to receive a voltage signal. The voltage output terminal is electrically coupled with the display panel. The detection module is electrically coupled with the voltage input terminal and configured to determine whether a voltage value of the voltage signal received at the voltage input terminal is greater than or equal to a preset voltage threshold. The detection module is configured to output a second control signal when the voltage value of the voltage signal is less than the preset voltage threshold.