METHOD AND APPARATUS FOR DRIVING LIQUID CRYSTAL DISPLAY PANEL

摘要

A LCD apparatus has a control circuit 40 which makes a timing of the rear edge of scanning pulses provided to predetermined scanning lines coincide with the time when the display potential is renewed, wherein each of the predetermined scanning lines corresponds to an addition of picture line to a picture or a reduction from two picture lines to one picture line on a picture in order to compensate a difference between the number of scanning lines of the LCD and that of lines of the picture to be displayed. In the control circuit 40, a circuit 45 detects cycle times of the vertical and horizontal sync pulses, a MPU 46 determines the reference value REF on the basis of the detected value and count CH of the horizontal sync pulse *HS from a counter 44, and a circuit 47 generates a signal AE which makes the time when the pulse count CD of pixel clock CLKD from the counter 42 becomes equal to the REF coincide with the timing of the rear edge of scanning pulse.