Patent ID: 8237691

Claim:
A display driver circuit of a display device comprising: a first digital to analog converter configured to convert a digital data to a gray-scale potential within a first potential range; and a second digital to analog converter configured to convert a digital data to a gray-scale potential within a second potential range, wherein maximum and minimum values of said first potential range are respectively higher than maximum and minimum values of said second potential range, and said maximum value of said second potential range is higher than a common potential that is applied to pixels of said display device in common, and said minimum value of the second potential range is lower than the common potential, wherein said first digital to analog converter includes a first transistor of a first conductivity type configured to output a first gray-scale potential not less than said common potential to an output terminal of said first digital to analog converter, wherein said second digital to analog converter includes: a second transistor of said first conductivity type configured to output a second gray-scale potential not less than said common potential to an output terminal of said second digital to analog converter; and a third transistor of a second conductivity type different than the first conductivity type, configured to output a third gray-scale potential not more than said common potential to said output terminal of said second digital to analog converter, wherein a second substrate potential applied to a back gate of said second transistor is lower than a first substrate potential applied to a back gate of said first transistor.