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Using a ILI9341V display
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Please be positive and constructive with your questions and comments.

Using a ILI9341V display

by PPGFlyer on Thu Apr 22, 2021 10:05 am

Does anybody have experience with porting code from a ILI9341 to a ILI9341V display driver? I'm trying to replace a screen on a working project that uses a 2.8" TFT CPT display with what I expected to be a drop in replacement (except for the CTP pins being external to the 50 pin), and can't get the display to light up. I've cross checked the specs sheets for both drivers and can't find any difference. I'm hoping someone here has come across this issue or at least knows where to look?

My code works for the previous ILI9341 display, but not the new ILI9341V display.

I'm replacing the screen on this board:
https://www.adafruit.com/product/2090

With this screen:
https://www.allshore.com/portals/0/PDFs ... AKCRNA.PDF

ILI9341 specs: (previous display)
https://cdn-shop.adafruit.com/datasheets/ILI9341.pdf

ILI9341V specs (new display)
https://dn.odroid.com/source_peripheral ... heet(V.100)_20130425.pdf

I'm using this library and using the framebuffer:
https://github.com/KurtE/ILI9341_t3n

I've tried the adafruit example codes and the adafruit library

Teensy 4.1 if that matters

Thanks in advance for any help.

PPGFlyer
 
Posts: 3
Joined: Sat Nov 14, 2020 8:23 am

Re: Using a ILI9341V display

by paulstoffregen on Tue Apr 27, 2021 6:36 am

It should "just work" if you connect IM0-IM3 (pins 6-9) for "4-wire 8-bit data serial interface II" as documented on page 10, and then of course connect the usual 5 signals to the proper pins.

paulstoffregen
 
Posts: 444
Joined: Sun Oct 11, 2009 11:23 am
Location: Portland, Oregon, USA

Re: Using a ILI9341V display

by PPGFlyer on Fri Apr 30, 2021 2:49 pm

Well I've figured out that yes, "it just works", I can see my code running on the screen. But my display backlight has a 6.4v forward voltage and the adafruit breakout only supplies 3.3 volts. Is there a way I can tap into this with my own 6.5 volts to supply the backlight? I'm this one step away from making this new brighter screen work!

If not, does anyone know of a 50 pin fpc shield I can use to make this work?

Thanks!

PPGFlyer
 
Posts: 3
Joined: Sat Nov 14, 2020 8:23 am

Please be positive and constructive with your questions and comments.