This OLED dis­play mod­ule is small, only 0.96” diag­o­nal, it is made of 128x64 indi­vid­ual blue OLED pix­els, each one is turn on or off by the con­troller chip. It works with­out back­light, that is, in a dark envi­ron­ment, OLED dis­play is high­er com­pared to that of LCD dis­play, you will like the minia­ture for its crisp­ness.    The Dri­ver chip of this OLED is SSD1306, which is com­pat­i­ble with IIC or SPI com­mu­ni­ca­tion. So this mod­ule can be con­trolled by SPI or I2C. There are 2 resis­tors at the back of the mod­ule and sick-screen to remind you how to set the com­mu­ni­ca­tion mode, the default mode is 4‑wires SPI mode. That is, except the VCC and GND, 4 wires would be need­ed when using 4‑wires SPI mode. You can also set to the I2C mode, in which mode 2 con­trol wires is need­ed. There is also a sim­ple switch-cap charge pump that turns 5v into a high volt­age dri­ve for the OLEDs, mak­ing this mod­ule the eas­i­est ways to get an OLED into your project.SpecificationDiag­o­nal Screen Size：0.96″Num­ber of Pixels：128 × 64Col­or Depth：Monochrome (Blue)Dimension：27.8 x27.3x 4.3 mmWork­ing Volt­age: 3.3~ 5V DCPow­er: 0.06W MaxView­ing Angle: >160 DegreeDuty：1/32Bright­ness ( cd/m2)：150 (Typ) @ 5VInterface：4‑wire SPI/3‑wire SPI/I2C Selec­tableDownloadFor Arduino Plat­form, thanks to Adafruit, this mod­ule works per­fect­ly with Adafruit OLED LibraryEle­crow Demo0.96” OLED On 51 plat­form using I2C0.96” OLED On 51 plat­form using SPI0.96” OLED On STM32 plat­formHow to make an gray image that can be shown on OLED128x64Wiki link