The Problem :
When powering off or switching sources, a reverse current can sneak into your display module—especially in shared supply systems. This backflow can damage delicate display drivers, flicker the screen, or even reduce the display’s lifespan.
The Solution :
To prevent this, use a Schottky diode or a P-channel MOSFET in reverse protection mode. These act like one-way valves—allowing power to flow to the display but blocking current from flowing backward. Schottky diodes are great for low current loads, while MOSFETs offer higher efficiency for larger displays.
Practical Example :
Imagine you’re using a 5V LCD with multiple power sources (e.g., USB + battery). When USB is unplugged, battery current can flow into the USB line and damage the LCD’s power rail. Add a 1N5819 Schottky diode, and reverse current is blocked instantly—your display stays safe.
Sample Calculation :
Let’s calculate the power drop across a Schottky diode:
Efficient and effective!
Product Suggestion :
Try ‘1N5819 diode’ or ‘P channel MOSFET’, both available here:
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