Patent ID: 8723849

Claim:
A liquid crystal display device, comprising a plurality of pixels provided at intersection parts where a plurality of sets of data lines each set including two data lines and a plurality of row scan lines intersect each other, each of the pixels, including: a display element in which a liquid crystal layer is sandwiched between a pixel electrode and a common electrode facing each other; a first sampling and holding part sampling a positive video signal supplied via one of the two data lines in one set using a first pixel selection transistor to hold the sampled signal in a first hold capacitor for a certain period of time; a second sampling and holding part sampling a negative video signal which has a polarity opposite to that of the positive video signal and is supplied via the other of the two data lines in one set using a second pixel selection transistor to hold the sampled signal in a second hold capacitor for a certain period of time; a first source-follower transistor having a gate connected to the first hold capacitor; a second source-follower transistor having a gate connected to the second hold capacitor; a first and a second switching transistor which switch a positive hold voltage of the first hold capacitor to be output through a source of the first source-follower transistor and a negative hold voltage of the second hold capacitor to be output through a source of the second source-follower transistor in a period shorter than a vertical scan period and apply the output voltages alternately to the pixel electrode, and also output voltage ranges of which are set so as to include linear ranges of input-output characteristics in the first and second source-follower transistors, respectively; and a constant current load transistor supplying a constant current to the first and second source-follower transistors through the first and second switching transistors, respectively, wherein respective threshold voltages of the first and second source-follower transistors are set by ion implantation so as to be different from a threshold voltage of the constant current load transistor.