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BParh.1
BParh.1
Senior III
May 21, 2021
Question

Can I use bigger LCD display for smaller display application?

  • May 21, 2021
  • 3 replies
  • 904 views

So I bought STM32F769 Disco board which come with LCD 800 x 480 size. But then the project decide to use smaller LCD size say 480 x 272.

Can use the same display for this? So in away, I dont mind to see the application graphics shown by portion of the display since this is prototyping only, This way can save some bucks :)

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3 replies

Osto
Osto
Senior
May 21, 2021

You have 2 ways. Either you scale to fit into 800x480 or you use only the required area. So the rest of the screen is always black.

Romain DIELEMAN
Romain DIELEMAN
ST Employee
May 21, 2021

Hi,

Like Osto said you could decide to do your project on only on the top left portion of the display and set a black background everywhere else. This way when you will move to the real hardware you will be able to import your UI project using the "Import GUI" option.

You could also potentially change the resolution of your display to 480*272, but this will be quite annoying to be honest (mostly because it is a DSI LCD display). To do so you will need to modify the LTDC settings and TouchGFX Generator settings in STM32CubeMX. You will also need to write a new LCD driver (or find one) as the one used in the application template for the STM32F769-DK is based on the 800*480 resolution (file otm8009a.h). You will also have to edit the TouchGFXHAL.cpp file to set your new resolution.

/Romain

BParh.1
BParh.1Author
Senior III
May 24, 2021

>  to do your project on only on the top left portion of the display and set a black background everywhere else

Thank you @Romain DIELEMAN​ , first approach sounds appealing to me to try, would you care to elaborate please?

Where the changes needed? CubeMX ? TouchGFX designer or manual code ?

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