This display is made of 128x32 individual white OLED pixels, each one is turned on or off by the controller chip. Because the display makes its own light, no backlight is required. This reduces the power required to run the OLED and is why the display has such high contrast.
Adafruit have taken the OLED display and put it onto a breakout PCB along with support circuitry hich allows you to use a 3.3V logic level. Since the display communicates via I2C you can easily connect it up with just two wires. Adafruit have also included SparkFun qwiic compatible STEMMA QT connectors for the I2C bus so you don't even need to solder.
Diagonal Screen Size：0.91"
Number of Pixels：128 × 32
Color Depth：Monochrome (White)
Brightness ( cd/m2)：150 (Typ) @ 7.25V
Display current draw is completely dependent on your usage: each OLED LED draws current when on so the more pixels you have lit, the more current is used. They tend to draw ~15mA or so in practice but for precise numbers you must measure the current in your usage circuit.
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