Projector, apparatus and method for driving optical scanner thereof

A projector apparatus including an optical scanner for scanning an image on a screen, the projector apparatus comprising:

• an optical scanner;
• a video processor for receiving video data and a vertical synchronization signal of the video data;
• and
• a scanner driver for controlling a number of horizontal lines of a horizontal driving signal of the optical scanner to be varied based on the received vertical synchronization signal,
• wherein the scanner driver comprises:
• a sensing signal processor for receiving a sensing signal that represents sensing of operation of the optical scanner and for generating a horizontal scan signal corresponding to a horizontal frequency of the optical scanner based on the received sensing signal;
• and
• a driving signal generator for generating at least one of a horizontal reference signal including line information that indicates the number of horizontal lines of the horizontal driving signal of the optical scanner, a reference clock signal and a scanner driving signal for driving the optical scanner based on the generated horizontal scan signal,
• wherein the driving signal generator decreases the number of horizontal lines of a frame when a frequency of the horizontal scan signal is decreased, and
• the driving signal generator increases the number of horizontal lines of a frame when a frequency of the horizontal scan signal is increased,
• wherein when the frequency of the horizontal scan signal is varied, the total number of horizontal lines for a predetermined time is fixed and the number of horizontal lines only for each video frame is varied in the predetermined time, and
• wherein the number of horizontal lines varied is located in a blank period of the horizontal scan signal.