Upsizing an OLED display???

[OLDmarty]

Hi All,

I have a few small OLED displays (ebay) on my picaxe projects, but these things are tiny at 128x64 pixel resolution.



If i upgrade to a physically bigger OLED display, for example 256x128 pixels (double my original size) will this result in my graphics only filling 1 quarter of the new display? and will i have to now adjust all my graphics/numbers to upscale to fill up the new (larger) display?

What i believe might happen:



I was thinking about this just recently, when i was asked by a friend if i could add a larger display to some (Non-Picaxe) equipment, but i have a strong feeling this won't work correctly without adjusting the code within the 3rd party product (which i clearly don't have access to).

Thanks in advance, if anyone has attempted something like this before?

 

[oracacle]

The answer is - it depends.
If the equipement ask the LCD about its specs and then works out what to display from there it could work just fine providing they share common commands and instructions.
I don't really see that being the case.
I have been playing with a u8g screen recently, and the code examples that I have ask the screen for information like hight and width, but the library used in those examples explictly state the chipset, size and interface type.

 

[hippy]

If i upgrade to a physically bigger OLED display, for example 256x128 pixels (double my original size) will this result in my graphics only filling 1 quarter of the new display? and will i have to now adjust all my graphics/numbers to upscale to fill up the new (larger) display?

I would have generally expected "yes" to both. But doubling horizontal and vertical resolutions shouldn't be too hard; it's basically putting a single pixel out twice to make it wider, repeating each line twice to make it taller.

The trickiness comes in converting some inevitable 8-bit data item holding 8 pixels to become a 16-bit data or pixels for output. That can slow things down if done at run-time so a change to 'font bitmap' or similar might be desirable.

 

[AllyCat]

Hi,

.... will this result in my graphics only filling 1 quarter of the new display?

No, it very probably won't work at all.

It all depends on the "Display Controller Chip" and two different ones are used even for the "standard" 128 x 64 pixel displays. Actually, the 128 x 32 pixel displays use the same controller chip and "pixel map" as the 128 x 64, but only half are shown at any time (i.e. with the capability of vertical scrolling).

Therefore, I would forget about using a PICaxe to drive a 256 pixel wide display (at least with individual pixels), but I have discussed the 128 by 32/64 OLED drivers HERE .

Cheers, Alan.