Display apparatus for vehicle

A display apparatus having a knob, comprising:

• a screen on which an image is displayed;
• a projector projecting the image to the screen;
• a knob rotatably disposed at one side of the screen, wherein the knob includes:
• a knob rotator;
• a plurality of reference protrusions provided at a first distance along an outer circumference of the knob rotator;
• and a plurality of directional protrusions provided at a second distance along the outer circumference of the knob rotator;
• a vibration sensor sensing a vibration from the knob and outputting a vibration signal;
• a controller configured to determine a rotational direction and a rotational amount of the knob based on the vibration signal output from the vibration sensor,
• a first vibrator configured to generate a first vibration by friction with the reference protrusions;
• and
• a second vibrator configured to generate a second vibration by friction with the directional protrusions,
• wherein the vibration sensor senses the first vibration to output a first pulse and senses the second vibration to output a second pulse, and
• wherein a level of the first pulse is different from a level of the second pulse and an output timing of the first pulse is different from an output timing of the second pulse.