Patent ID: 7813124

Claim:
An electronic information board comprising a frame ( 40 ), a flat display element ( 30 ) for displaying information, electronic equipment ( 62 ) for controlling the operation of the information board, a display casing ( 50 ), inside of which said display element has been placed, and a device casing ( 60 ), inside of which said electronic equipment have been placed, characterized in that: in the walls of the display casing and device casing there are flow holes ( 64 a , 64 b , 64 d ) for forming an air flow passage from the device casing to the display casing and from the display casing back to the device casing, and the information board further comprises: means for arranging closed circulation of cooling air through the display casing and the device casing and; a cooling device for cooling the air flowing through the display casing ( 50 ) and the device casing ( 60 ).