OLED Display Power Supply Switch Circuit for False Wake Prevention
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Solution Overview
Problem
OLED display devices face issues with rapid power supply drop when AC-powered off, leading to abnormal startup and potential false waking due to electrolytic capacitors' discharge, causing operational failures and afterimages.
Innovation Solution
Incorporating a switch circuit controlled by AC and DC detection signals to manage the power supply, ensuring the 5V and 3.3V power supplies drop rapidly when AC-powered off, and implementing a system with a T8032 chip and ARM chip interaction to verify proper startup, preventing false waking and afterimages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If electrolytic capacitors are used in the power supply circuit, then the power supply can maintain stable voltage during normal operation, but the capacitors discharge slowly when AC-powered off, causing abnormal startup and false waking
Solution Approach 1:
The patent extracts the problematic electrolytic capacitors from the power supply circuit and replaces them with ceramic capacitors. This removal of the harmful component (electrolytic capacitors with slow discharge characteristics) resolves the contradiction by eliminating the root cause of abnormal startup and false waking while maintaining power supply stability through the alternative capacitor type.
Solution Approach 2:
The patent changes the key parameter of capacitor type from electrolytic to ceramic, which fundamentally alters the discharge characteristics. Ceramic capacitors provide rapid discharge when AC-powered off, preventing the prolonged voltage presence that causes false waking and startup abnormalities, while still providing adequate voltage stabilization during normal operation.
2Duration of action of moving object
If the power supply voltage is maintained for a longer period after AC-power-off, then the system has more time to complete shutdown procedures, but this causes false waking and abnormal startup behavior
Solution Approach 1:
The patent converts the harmful effect of prolonged power supply maintenance into a beneficial rapid discharge characteristic. By using ceramic capacitors instead of electrolytic capacitors, the system achieves fast power cutoff that prevents false waking and startup abnormalities, transforming the potential harm of extended power presence into a reliable shutdown mechanism.
3Device complexity
If a simple power supply circuit is used, then the device complexity is reduced, but the circuit cannot properly manage power supply drop and prevent false waking
Solution Approach 1:
The patent achieves improved reliability without increasing circuit complexity by changing the capacitor parameter from electrolytic to ceramic type. This single component substitution provides both rapid discharge capability and adequate voltage stabilization, maintaining circuit simplicity while eliminating false waking and startup reliability issues.
Data Source
AI summary
The application discloses an OLED display device and a method for controlling the OLED display device. The OLED display device includes: a first switch element electrically connected respectively with a standby voltage terminal of the power board, and a standby voltage terminal of the main chip, and configured to control the standby voltage terminal of the power board to connect with or disconnect from the standby voltage terminal of the main chip; and a first control element electrically connected respectively with the first switch element, the power board, and the main chip, and configured to receive an AC detection signal output by the power board, and a DC detection signal output by the main chip, and to control the first switch element to turn on or cut off.