Image display apparatus and image display method

An image display apparatus comprising:

• a light source which includes a plurality of light emitting elements for emitting a plurality of light beams arranged in a direction corresponding to a sub-scanning direction on an image display screen;
• a light source driver which individually modulates intensities of the plurality of light beams in accordance with input image data;
• a light scanning unit which performs main scanning and sub-scanning in such a way that light irradiation positions on the image display screen that are irradiated with the plurality of light beams are moved in a main scanning direction on the image display screen during the main scanning and the light irradiation positions are moved in the sub-scanning direction during the sub-scanning;
• the image display screen which receives the plurality of light beams scanned in the main scanning direction and the sub-scanning direction by the light scanning unit, thereby causing an image to be displayed;
• and
• a controller which controls the light scanning unit so as to perform one sub-scanning each time that the plurality of light beams are scanned in the main scanning direction;
• wherein the controller controls the light scanning unit in such a way that scanning lines of the main scanning at the same light irradiation position in previous frame and current frame are displayed by the main scanning of different ones of the plurality of light beams arranged in the direction corresponding to the sub-scanning direction.

An image display method comprising the steps of:

• emitting a plurality of light beams arranged in a direction corresponding to a sub-scanning direction on an image display screen from a plurality of light emitting elements of a light source, intensities of the plurality of light beams being individually modulated in accordance with input image data;
• and
• performing main scanning and sub-scanning by a light scanning unit in such a way that light irradiation positions on the image display screen that are irradiated with the plurality of light beams are moved in a main scanning direction on the image display screen during the main scanning and the light irradiation positions are moved in the sub-scanning direction during the sub-scanning, one sub-scanning being performed each time that the plurality of light beams are scanned in the main scanning direction;
• wherein, in one frame period, a distance of movement of the light irradiation positions on the image display screen moved by one sub-scanning is a distance obtained by multiplying an interval between adjacent two scanning lines in the sub-scanning direction on the image display screen by a predetermined integer which is an integer smaller than number of the plurality of light beams arranged in the direction corresponding to the sub-scanning direction.

An image display method comprising the steps of:

• emitting a plurality of light beams arranged in a direction corresponding to a sub-scanning direction on an image display screen from a plurality of light emitting elements of a light source, intensities of the plurality of light beams being individually modulated in accordance with input image data;
• and
• performing main scanning and sub-scanning by a light scanning unit in such a way that light irradiation positions on the image display screen that are irradiated with the plurality of light beams are moved in a main scanning direction on the image display screen during the main scanning and the light irradiation positions are moved in the sub-scanning direction during the sub-scanning, one sub-scanning being performed each time that the plurality of light beams are scanned in the main scanning direction;
• wherein the controller controls the light scanning unit in such a way that scanning lines of the main scanning at the same light irradiation position in previous frame and current frame are displayed by the main scanning of different ones of the plurality of light beams arranged in the direction corresponding to the sub-scanning direction.