Patent ID: 7750348

Claim:
A display device with a polysilicon substrate, comprising: a display region; a driving region; a first plurality of thin film transistors, each transistor including a source, gate and drain region, and located in the display region; a second plurality of thin film transistors, each transistor including a source, gate and drain region, and located in the driving region; primary crystal grain boundaries in the polysilicon substrate in the display region and in the driving region; secondary crystal grain boundaries in the polysilicon substrate in the display region and in the driving region; wherein the primary crystal grain boundaries are located within the gate regions of the first plurality of thin film transistors and are inclined to a first direction of current flowing from source to drain of each of the first plurality of thin film transistors in the display region at an angle of −30° to 30° and the secondary crystal grain boundaries are located within the gate regions of the first plurality of thin film transistors and are inclined to a second direction of current flowing from source to drain of each of the first plurality of thin film transistors in the display region, and wherein the primary crystal grain boundaries are located within the gate regions of the second plurality of thin film transistors and are inclined to the second direction of current flowing from source to drain of each of the second plurality of thin film transistors in the driving region at an angle of 30° to 150° and the secondary crystal grain boundaries are located within the gate regions of the second plurality of thin film transistors and are inclined to the first direction of the current flowing from source to drain of each of the second plurality of thin film transistors in the driving region.