OLED SSD1351: Pixel position error

[audreylim]

Hello, I'm trying to display numbers on my 1.5inch OLED ST1351 128x128 (with ESP8266). I wanted the text to look as sharp as this:

As advertised: https://www.hawkusa.com/manufacturers/newhaven/displays/nhd-15-128128ugc3?gclid=CjwKCAiA6seQBhAfEiwAvPqu1xuJyPlAAslXiiE0YohiaL7sGPuy0Q19w6c7ZqEvOC4Qu92xEk6CWRoCncIQAvD_BwE Edit: The actual one is this: https://www.amazon.com/1-5inch-Interface-Raspberry-Examples-Provided/dp/B07D9NVJPZ/ref=pd_lpo_2?pd_rd_i=B07D9NVJPZ&psc=1

Instead, I got this:

I'm running this code: https://github.com/Bodmer/TFT_eSPI/blob/11b006e1d926b84508d257fdac9d7e90cabfcd5f/examples/Smooth%20Fonts/SPIFFS/Print_Smooth_Font/Print_Smooth_Font.ino

This code is much sharper than the other fonts like yellowtail etc, but it's still not sharp as the one in the first image. Am I missing something or is the sharpness constrained by the OLED model?

Edit: I found a much sharper font! https://github.com/Bodmer/TFT_eSPI/blob/master/examples/160%20x%20128/RLE_Font_test/RLE_Font_test.ino But let me know if I'm still missing anything else and what I should look at the make my text sharper.

[audreylim]

Hmm so this font looks pretty smooth on my LCD https://github.com/Bodmer/TFT_eSPI/blob/master/examples/160%20x%20128/RLE_Font_test/RLE_Font_test.ino

Only problem is that I can't make the text size smaller.

I also cannot use the letter "S" or "," with font 6, or the whole thing doesn't render.

   tft.drawString("S123", 0, 0, 4);

Looks like this is an issue: https://github.com/Bodmer/TFT_eSPI/issues/965

Any solutions to still get smooth fonts and be able to make the the text smaller?

[Bodmer]

The fonts with numbers 6,7 and 8 are numerals only plus a few others for numeric/time values of the screen. These fonts were built for the UNO originally which was very FLASH constrained.

I am not sure what you mean by "sharpness". The smooth fonts use anti-aliasing to reduce pixel resolution jaggedness.

[Bodmer]

If your are not getting the font you expect it may be becuase you have not created a SPIFFS partition and uploaded the files.

If you have enough FLASH then you can use these array based examples since then you do not have to configure and upload the SPIFFS files.

[audreylim]

Hmm, I uploaded the examples again and they are anti-aliased, thank you.

Is there a way to adjust the size of this font? https://github.com/Bodmer/TFT_eSPI/blob/master/examples/160%20x%20128/RLE_Font_test/RLE_Font_test.ino

[audreylim]

I'm actually getting these when running this code: https://github.com/Bodmer/TFT_eSPI/tree/master/examples/Smooth%20Fonts/FLASH_Array/Font_Demo_1_Array

The large font has noise at the back and the small font is not rendered cleanly.

[Bodmer]

Looks like screen rotation does not work on that screen driver. Try rotation 0 only (default). That OLED driver was submitted by a user, I don't have one of those screens, so I am unable to test :-(

[Bodmer]

I had a look at this and see I changed the pixel drawing code recently and introduced a bug.

I will upload a new fixed version.

[Bodmer]

New version is 2.4.40, please test as I am unable to do so.

[audreylim]

Much better although the last image still seems buggy.

[audreylim]

I just realized it's intentional https://github.com/Bodmer/TFT_eSPI/blob/c11ecd6932d50cdd63260e346a8b10eb519c7a69/examples/Smooth%20Fonts/FLASH_Array/Font_Demo_1_Array/Font_Demo_1_Array.ino#L107.

Thanks! It works fine.

[Bodmer]

Thanks for testing and reporting this problem.