Laser scanning display with luminance adjustment
AssigneeRicoh Company, Ltd.
InventorsMakoto Inamoto, Yoshinori Hayashi, Hiroyuki Tanabe
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Abstract
A HUD device comprising a display device for scanning with light emitted by a light source (e.g., an LD) an optical element array (e.g., a micro lens array) including multiple optical elements (e.g., micro lenses) to form an image and for projecting the light that has formed the image. The display device includes a control unit 8060 that is capable of changing output power of the light In this case, it is possible to provide a display device that is capable of adjusting luminance of an image while controlling against luminance unevenness of the image from occurring.
Claims17
A display device comprising:
- a light source;
- a light deflector configured to deflect light emitted by the light source;
- an optical element array including a plurality of optical elements, which is scanned with the light deflected via the light deflector;
- a mirror configured to project the light that has traveled through the optical element array;
- and
- a control unit that is capable of changing an output power of the light source at least once while each of the plurality of optical elements is being scanned with the light deflected via the light deflector, wherein
- the control unit changes the output power of the light source by executing
- a high output power mode in which the output power of the light source is increased;
- and
- a low output power mode in which the output power of the light source is decreased, and
- a distance between centers of two adjacent beam spots, which are included in beam spots formed side-by-side in a scanning direction on the optical element array during the high output power mode, is narrower than a width of each of the plurality of optical elements in the scanning direction.
A display method for scanning an optical element array including a plurality of optical elements with scanning light and for projecting light that has traveled through the optical element array to display an image, the display method comprising:
- scanning each of the plurality of optical elements with the scanning light;
- changing an output power of a light source that emits the scanning light at least once while each of the plurality of optical elements is being scanned with the scanning light to execute each of a high output power mode and a low output power mode, wherein
- the high output power mode increases the output power of the light source,
- the low output power mode decreases the output power of the light source, and
- a distance between centers of two adjacent beam spots, which are included in beam spots formed side-by-side in a scanning direction on the optical element array during the high output power mode, is narrower than a width of each of the plurality of optical elements in the scanning direction.
Dependencies are inferred from the claim text.