The first was presented as a two-colour OLED element that is attached to a product package. When the package is unopened, a green tick is displayed. When the package is opened, the fuse is blown and the tick changes into a red cross.
Read more: http://www.vtt.fi/uutta/2008/28102008_oled-elementti.jsp?lang=en
that's kinda cool
karlsenw 2 years ago