PURPOSE: To simplify a circuit constitution with performing the pattern display such as a cursor frame and continuous ruled lines without using ROM by controlling a shift register with a logical operation circuit.

CONSTITUTION: Information indicating left, upper, lower and right ruled line display is successively inputted to terminals E1 to E4 of control circuit 2 as ruled line information from a refresh memory; and for example, when information is inputted to only terminal E1, parallel input terminals A, B and C of parallel-series conversion register 1 become L-level and D becomes H-level. Each information set in register 1 is shifted by two shift clock pulses before and after a one-character time, and left ruled line video signals are obtained as the series output at terminal QD. Similarly, upper, lower and right ruled line video signals are obtained; and in case of upper and lower ruled line indication, scanning line information RCO and RC13 are given as the control input simultaneously