Patent ID: 8421780

Claim:
A control signal generating circuit comprising: a counter circuit including, a counter configured to count a number of pulses in a pulse signal during a display period, and a selector circuit configured to select the pulse signal from among a plurality of pulse signals based on a selection signal and supply the pulse signal to the counter; a plurality of synchronization signal generating circuits, each synchronization signal generating circuit configured to generate a control signal according to an output signal of the counter circuit and the selection signal; and a trigger pulse generating circuit configured to generate a trigger pulse signal by use of one or more bits of the output signal of the counter circuit, wherein the control signal is generated by use of the trigger pulse signal generated by the trigger pulse generating circuit, the plurality of synchronization signal generating circuits are configured to generate the control signal according to the trigger pulse signal and the selection signal, wherein the selection signal indicates a type of the pulse signal which is to be selected and supplied to the counter by the selector circuit, and each of the plurality of synchronization signal generating circuits includes: a two-input NAND circuit configured to receive the trigger pulse signal and a signal indicating that the selector circuit selects a pulse signal which is to be supplied to the counter and which has a type corresponding to a respective one of the plurality of synchronization generating circuits; and a flip-flop configured to receive an output signal of the NAND circuit.