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Replacing EL backlit LCD with LED backlit LCD - Again

I posted about this a few weeks ago, but I still have a concern.

I deal a lot with a legacy device with an EL backlit LCD. The backlight on this unit fades badly over time and the inverter is also prone to failure, so I sometimes need to fix them. Not only that, but EL backlit LCDs seem to be getting hard to find, and in particular the LCD module used in this unit is now almost impossible to find.

So I'm thinking of using LED backlit LCDs, which are much easier to find. The inverter for the original LCD takes 5V dc input and produces

100V ac at 400Hz. I'm thinking of just bypassing the inverter altogether and route its 5V dc input directly to the LED backlight.

Here's my concern. The LED backlit LCD's I've seen all indicate a 1/16 duty method for the backlight. I assume that means a PWM source which is on only 1/16 of the time. If that's the case, I think it blows my plan, since that would require a microprocessor or something.

Is my concern founded, or should I just go ahead and hook a continuous

5V supply to the LED backlight?
Reply to
Jim T. Kirk
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I've used LCD panels with LED backlighting, and just run them from DC. Some are specced to just run straight from 5v, and some require a series resistor. I would just go ahead and try one of the panels that you are intending to use, and put a resistor in series first, and see what the brightness and current draw is like.

Arfa

Reply to
Arfa Daily

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