Here are some details about the 0.91 inch oled display 4 Pin 128x32 :

The most attractive thing about using OLED displays is that they do not need a backlight like conventional LCD/LED screens. The organic material itself has a property known as Electroluminescence (EL), which causes the material to “glow” when stimulated by a current or an electric field. Best energy-saving displays ever!!!

This 0.91 inch 128×32 White OLED Module offers 128×32 pixel resolution. They feature much less thickness than LCD displays with good brightness and also produce better and true colors.

This OLED Display Module is very compact and will add a great user interface experience to your Arduino project. The connection of this display with Arduino is made through the I2C(also called as IIC) serial interface.

The 0.91 inch 128×32 White OLED Module produces blue text on a black background with very good contrast when supplied with a DC 2.8V supply. The OLED Display Modules also offer a very wide viewing angle.