Patent ID: 8009241

Claim:
A liquid crystal display device, comprising: a driving device of a structure that a plurality of thin film transistor having a channel of poly silicon are connected in parallel, in a driving circuit, wherein the driving device comprises an active layer formed to have a plurality of channels which are formed on a buffer film that is formed on a substrate, a gate electrode formed to overlap with the active layer and a gate insulating film therebetween, and a source electrode and a drain electrode being in contact with the active layer with the gate electrode and an intermediate insulating film therebetween; a hole exposing at least one of a substrate and the buffer film between the adjacent channels; and a heat conductive material formed between the adjacent channels of the driving device and close to the channel to transmit the heat generated at the channel, wherein the heat conductive material is in contact with the buffer film through the hole and is formed on the entire surface of the driving device to protect the driving device.