PURPOSE: To obtain a simpler zigzag head data generating circuit by using a switch circuit so as to put an inputted serial data into an S/P conversion circuit and an S/P conversion circuit with a delay circuit one by one bit alternately.
CONSTITUTION: A serial signal from an input terminal 1 is inputted to the S/P conversion circuit 6 and the S/P conversion circuit 8 with a delay circuit by a switch circuit 5 alternately while being distributed at every bit. An even number order data is inputted directly to the circuit 6 and an odd number order data is inputted to a shift register 9. Thus, the odd number order data inputted at the same time as the existing data in the circuit 6 exists at the first half of the register 9 and the data of the odd number order before one line is given to the latter half of the register 9 and the odd number order data before two lines exists in a shift register 10. Thus, in inputting a strobe signal to an input terminal 2, the even order number data inputted just before is outputted from a drive circuit 7 and the odd number order of data inputted before two lines is outputted from a drive circuit 11.