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Split text (mostly where intended by OP, but where only 1 x Enter had been used) to prevent "wall of text". Some minor grammar changes to improve readability.
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SamGibson ♦
SamGibson ♦
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imI'm currently trying to figure out how to drive a bare 7seg7-segment 4 digit lcd-digit LCD glass (without driver). Part

Part number of display: VI-415-DP-RC-S I’m

I’m currently planingplanning to apply a (min.) 30 Hz square wave to active segments. With VOn = 3V. The common pin of the lcdLCD is currently planedplanned to be at GND (0V) Is

Is that valid? Because I have read that DC is the worst thing that could happen to a lcdan LCD and I don’t know if a square wave is preventing the display from damage. If

If I need a “real” AC source, is it valid to put 1.5V on the common lead of the display via a resistor ladder? This would result toin a voltage from -1.5V to 1.5V on Segment pins. If

If this is valid, witchwhich current should be flowing down the resistor ladder.? And I assume that the segment off voltage then needs to be 1.5V —> 0V for the lcdLCD between segment and common. Thanks in advance

im currently trying to figure out how to drive a bare 7seg 4 digit lcd glass (without driver). Part number of display: VI-415-DP-RC-S I’m currently planing to apply a (min.) 30 Hz square wave to active segments. With VOn = 3V. The common pin of the lcd is currently planed to be at GND (0V) Is that valid? Because I have read that DC is the worst thing that could happen to a lcd and I don’t know if a square wave is preventing the display from damage. If I need a “real” AC source is it valid to put 1.5V on the common lead of the display via a resistor ladder? This would result to a voltage from -1.5V to 1.5V on Segment pins. If this is valid, witch current should be flowing down the resistor ladder. And I assume that the segment off voltage then needs to be 1.5V —> 0V for the lcd between segment and common. Thanks in advance

I'm currently trying to figure out how to drive a bare 7-segment 4-digit LCD glass (without driver).

Part number of display: VI-415-DP-RC-S

I’m currently planning to apply a (min.) 30 Hz square wave to active segments. With VOn = 3V. The common pin of the LCD is currently planned to be at GND (0V)

Is that valid? Because I have read that DC is the worst thing that could happen to an LCD and I don’t know if a square wave is preventing the display from damage.

If I need a “real” AC source, is it valid to put 1.5V on the common lead of the display via a resistor ladder? This would result in a voltage from -1.5V to 1.5V on Segment pins.

If this is valid, which current should be flowing down the resistor ladder? And I assume that the segment off voltage then needs to be 1.5V —> 0V for the LCD between segment and common.

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Ohjurot
Ohjurot
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LCD Glass driving waveform

im currently trying to figure out how to drive a bare 7seg 4 digit lcd glass (without driver). Part number of display: VI-415-DP-RC-S I’m currently planing to apply a (min.) 30 Hz square wave to active segments. With VOn = 3V. The common pin of the lcd is currently planed to be at GND (0V) Is that valid? Because I have read that DC is the worst thing that could happen to a lcd and I don’t know if a square wave is preventing the display from damage. If I need a “real” AC source is it valid to put 1.5V on the common lead of the display via a resistor ladder? This would result to a voltage from -1.5V to 1.5V on Segment pins. If this is valid, witch current should be flowing down the resistor ladder. And I assume that the segment off voltage then needs to be 1.5V —> 0V for the lcd between segment and common. Thanks in advance