🔍 Possible Causes of the Flickering: 1. Incorrect Level Shifting / Driving Logic If you're still using 5V logic signals (e.g., from a microcontroller or TTL), they may not be able to properly switch the 12V supply through the driver circuit, especially if the driver requires a certain input voltage to turn on fully (like a transistor base or MOSFET gate). 2. Insufficient Current or Pull-down Resistance When switching higher voltages, you may need pull-down resistors or MOSFET drivers to cleanly switch the segment lines. Otherwise, the segments can float or partially turn on, causing visible flickering. 3. Driver Circuit Configuration You mentioned adding a driver circuit—if it’s a transistor or MOSFET array, make sure: The gate/base is driven properly (use resistor if needed). You are using NPN or N-MOS for low-side switching, or PNP/P-MOS for high-side switching, depending on your design. Proper current-limiting resistors are used for each segment. 4. Timing or Refresh Rate If you are using multiplexing (scanning digits one at a time), and the refresh rate is too low, it can cause flickering. Make sure the scanning happens fast enough (>60 Hz per digit) for a stable visual effect. 💡 Suggestions: Double-check your driver circuit—post a diagram if you can. Verify voltage levels going into the segment pins. Try measuring with a multimeter or oscilloscope to see if the segment pins are toggling cleanly between 0V and 12V. If using a microcontroller, consider adding a level shifter IC (like 74HCT series) between the MCU and the high-voltage side.
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