Thanks! I got a pair of I2C 0,96" displays. I do not need high performance, but some better resolution due to info amount... I am also a bit limited in terms of pins. Most higher resolution screens need more pins, usually abusing many A-pins which I need all even on a mega, is there a way to connect something like ST7735 or ILI9225 based screen over I2C (except of course using another arduino for them, and making my main arduino tell the info over i2C...)
There aren't a whole lot of dot matrix I2C displays beyond the SSD1306. I've been looking for one as well. Some screens support 3-wire SPI mode (which requires bit-banging the protocol), but the screens you mentioned require only 4 wires (MOSI, CLK, RESET, D/C). Those wires can be shared among multiple displays with 1 unique CS (chip select) to enable each display for listening to new data. If you're only connecting one screen, then the CS and backlight pins can be tied to the correct logic levels and not take any GPIO pins.