⚠️ The Problem: Reverse Current Can Damage Your Display

When powering LCD or OLED displays, reverse current (when voltage flows the wrong way) can occur during shutdown or supply switching. This can cause flickering, performance issues, or even permanent damage to sensitive display circuits—especially in battery-powered IoT devices and prototyping boards.

🔧 The Solution: Add Reverse Current Protection

To protect your display, you can use a Schottky diode or a P-channel MOSFET in a high-side configuration. These components prevent current from flowing back into the display when the power supply drops or switches unexpectedly. It’s a simple yet effective way to ensure display longevity and reliability.

💡 Practical Example: DIY Smart Display with Multiple Power Sources

Imagine a hobbyist project where a 5V OLED is powered either by USB or a battery. Without protection, switching between these sources might allow current from the battery to flow backward into the USB circuit. Adding a P-channel MOSFET between the power input and the display avoids this, ensuring only forward current flows.

🧮 Sample Calculation: Diode Voltage Drop

Using a Schottky diode with a forward voltage of 0.3V:

If your display needs 5V, the diode output would be 5V – 0.3V = 4.7V — still safe for most 5V-rated displays.

🛍️ Product Suggestion:

Try high-quality MOSFETs or Schottky diodes for protection circuits.

🔗 Shop MOSFET – Made in India

🔗 [Shop Schottky Diode – Made in India]

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