Patent ID: 6154072
Filing Date: 2000-11-28
Classification: G09G,H03K

Abstract:
A signal production circuit for producing a control signal used in a driving and controlling circuit of a display device externally input to the driving and controlling circuit, using an external interface signal, which includes a vertical synchronization signal having a predetermined frequency and a reference clock signal in synchronization with the vertical synchronization signal, the signal production circuit comprising:a first counter circuit for counting a number of reference clock signal pulses up to a value of a parameter which is preset based on a time interval of one cycle of the vertical synchronization signal and a predetermined target period;a second counter circuit for counting a number of reference clock signal pulses corresponding to the target period, the counting being performed based on the parameter and a number of reference clock signal pulses for one cycle of the vertical synchronization signal; anda signal output circuit for outputting a signal having a predetermined time period based on the number of reference clock signal pulses corresponding to the target period.