Patent ID: 8023042

Claim:
A portable telephone comprising: a voice output section; a voice input section; operation switches; a display device including a driver circuit and a pixel section; wherein the driver circuit comprising: a third thin film transistor comprising: a channel forming region overlapped with a gate electrode through a gate insulating film; and a second impurity region having an n-type conductivity and a first impurity region having the n-type conductivity which forms a source region or a drain region, wherein the second impurity region is between the channel forming region and the first impurity region, and wherein the first impurity region and the second impurity region are not overlapped with the gate electrode through the gate insulating film; and a fifth thin film transistor comprising: a channel forming region and a fifth impurity region having p-type conductivity which forms a source region or a drain region; and wherein the pixel section comprises: a storage capacitor; and a fourth thin film transistor comprising: a channel forming region overlapped with a gate electrode through the gate insulating film; and a fourth impurity region having the n-type conductivity and a first impurity region having the n-type conductivity which forms a source region or a drain region, wherein the fourth impurity region is between the channel forming region and the first impurity region, and wherein the first impurity region and the fourth impurity region are not overlapped with the gate electrode through the gate insulating film, wherein a length of the second impurity region is different from a length of the fourth impurity region, wherein the storage capacitor is formed by a light shielding film over the fourth thin film transistor, a dielectric film over the light shielding film, and a pixel electrode over the dielectric film, wherein the pixel electrode is connected to the fourth thin film transistor through an opening formed in a spacer, and wherein the spacer is provided on and in contact with the light shielding film.