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...where a bunch of geeks got together to make other people's ideas come to life.
This is a 1.8" 18-bit color display by Adafruit which uses 4-wire SPI to communicate. The display has a built in SSD1306 driver which handles all the RAM buffering, so that little work needs to be done by your microcontroller -- even a small one with low memory and few pins available!
The 1.8" display has 128 x 160 color pixels. Unlike the low cost "Nokia 6110" and similar LCD displays, which are CSTN type that have poor color and are slow to refresh, this display is a true TFT! The TFT driver (ST7735R) can display full 18-bit color (262,144 shades!). The LCD will always come with the same driver chip, so there are no worries that your code will not work from one to the other.
The breakout has the TFT display soldered on (it uses a delicate flex circuit connector) as well as an ultra-low-dropout 3.3V regulator and a 3/5V level shifter, so you can use it with 3.3V or 5V power and logic. There is also a Micro SD card holder so you can easily load full color bitmaps from a FAT16/FAT32 formatted Micro SD card. The Micro SD card is not included, but you can pick one up from our related products.
Adafruit has a great getting started tutorial for this board.