BEAM Authentic's smart display button is a wearable display that uses a 1.4" 400x400 round AMOLED display to can hold up to 100 images and display these for up to 24 hours. The BEAM button is controlled via smartphone application and can also be used as a panic button.

BEAM Authentic smart display button photo

The BEAM display button is shipping for $119 (note: affiliate link to Amazon).

OLED type: 

1.4" 400x400 round AMOLED

Kyulux - Hyperfluoresence OLED emittersKyulux - Hyperfluoresence OLED emitters