Can we PWM an LED backlight on LCD module

[Demon]

Comparison between LCDs from AliExpress (first batch), and LCDs from Alibaba. The viewing angle on the Alibaba units is really good.

Note that the contrast and backlight are not tuned for the Alibaba units. The (rough) adjustments were done using the AliExpress units.

[HenrikOlsson]

Oooh, me like the blue-ish/white on black in the second half, almost looks like VFDs.

[Demon]

Oooh, me like the blue-ish/white on black in the second half, almost looks like VFDs.

Yup, they are just awesome! I'm so happy I went with this supplier. If you ever want to order a large batch, let me know and I'll give you the rep's contact info over at https://cle.en.alibaba.com. They have other colours, the black-on-yellow background was real nice.

I still have current tests to do, as well as fine-tune the contrast and backlight adjustment (I want to limit the range to a safe usable range that won't fatigue the LEDs).

[Ioannis]

I am interested in the supplier please.

Ioannis

[Demon]

First test with 4 dual-encoders with LCD driven from 16F18877.

Barely 25mA to drive entire circuit, including backlight.




I still have to do more contrast & backlight tests on these, but this is awesome. I expected this to be at least 150mA.

[Demon]

I suspected my voltmeter gave a faulty reading, so I connected 2 ammeters in series (removed my yellow power LED at the bottom to give a more true reading).



14.5mA! That's just crazy low. :O

[Ioannis]

That's incredible!

Amazing LCD's...!

Ioannis