Redraw rate on 2.2" 18-bit color TFT LCD display with microS

[gothi]

I've watched this video http://youtu.be/H4fMNvYoCG0 and the draw rate of the screen is slower than I expected. I'd just like to understand what's causing this:

• Is it a limit of the screen itself?
• is it a limit of the Arduino?
• How it's connected?
• The image conversion (would a pre-converted file ready to be blitted be faster)?

Are there faster displays out there? I'm ideally looking for a 1 to 2 inch colour display where I can swap between 8 or so images with no visible redraw "lag"

[adafruit_support_rick]

It's a combination of SPI speed, the speed of the Arduino, and the speed of reading the SD card. Arduino has a small internal SRAM, so it has to transfer bitmaps from the SD card in small blocks. You can't fit an entire full-screen bitmap into SRAM.

[gothi]

Thanks Rick, with the 2K SRAM I guess my ideal of full colour images being swapped instantly is never going to happen with an Arduino.

Would a Raspberry Pi be faster or will the limiting factor be the SPI speed?

[adafruit_support_rick]

On a Pi, SPI will be the limiting factor, but it should be quicker than an Arduino.

You might have a look at out PiTFT, with is a 2.8" touchscreen designed for use with the Pi.
https://www.adafruit.com/products/1601 - resistive touchscreen
https://www.adafruit.com/products/1983 - capacitive touchscreen.

[gothi]

Thanks again Rick, slightly larger than I was hoping for but it looks like my options are a bit limited in this regard :-)