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Topic: using a TFT display in sunlight (Read 1 time) previous topic - next topic

Wild_Bill

I have completed my first Arduino project using a Mega 2650, Touch Screen Shield V2.2 and a 3.2" TFT LCD screen purchased on Ebay. My sketch uses the UTFT.h and URTouch.h libraries with the UTFT defined as an ILI9341. The project is designed to be used outdoors, but the display was washed out and hard to read. I eliminated the colored sections and changed the text to all capitals, white text on a black background. This was a slight improvement.

I tried using the Grotesk Bold font, but my sketch and the Mega did not like that option. I have also tried myGLCD.setBrightness(16) and myGLCD.setContrast(64) with no apparent change in the display. I have also added a sun hood to the project.

Has anyone been able to use a TFT display in sunlight? I would prefer to stay with a 3.2" display, but might consider rebuilding my project to accommodate a smaller form factor if the display can be improved. Thank you for any suggestions.

demkat1

I have the same problem (sunlight) .
Found that all the brightness depend on backlight. these models are around 200cd/m2 and needed at least 800. Heard that some "Newheaven" (maker) models accomplish that.
good luck

bitbank

Obvious question - have you considered using a monochrome transflective display? Something like the ST7920 / UC1701 2" 128x64 are very readable in sunlight and quite inexpensive.
Library? We don't need no stinkin' library...we write our own

Wild_Bill

#3
Jun 25, 2018, 02:15 am Last Edit: Jun 25, 2018, 10:41 am by Wild_Bill
Obvious question - have you considered using a monochrome transflective display? Something like the ST7920 / UC1701 2" 128x64 are very readable in sunlight and quite inexpensive.

I should have mentioned that my project is centered around a touch keypad.

Thanks demkat1 for the lead, I'm trying to justify the price.

Wild_Bill

I had an epiphany yesterday and rewrote the sketch to use black text on a white screen. Still need to use the sun shade, but the screen is much more readable. :) 

Bwanna

#5
Aug 31, 2018, 04:27 pm Last Edit: Aug 31, 2018, 04:59 pm by Bwanna
I have a current project with similar general requirements: to be used outside (on my motorcycle) and with touchscreen.  The current working project uses a 1.8" TFT w/o touch... so I have physical buttons for now.

I'm looking to change to a transflective display with touch... so I think we're pursuing the same general goals.   Recently I came across the displays from this company that might provide what we need.
Fanscoo 2.4" Transflective TFT ili9341 display

Have sent an inquiry re: if these provide touch.  They seem to offer a range of drivers as well, but would be happy to use the same ili9341 driver as my current TFT display.  Here's their company listing of displays: Fanscoo Display listings

Would appreciate your thoughts on these products.  If I can get a few samples from them, I'll be glad to share my observations and outcomes.

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