Display device, and portable apparatus having projector function
AssigneeFunai Electric Co., Ltd.
InventorsKen Nishioka, Kenji Nagashima, Atsuya Hirano, Atsuhiko Chikaoka
Life of this patent
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Abstract
Disclosed is a display device capable of inhibiting a projected picture from occurrence of brightness unevenness while reducing speckle noise. The display device (100) includes a control portion (15) continuously supplying current to a laser beam generation portion (12, 13, 14) nonstop for a period longer than a first period thereby controlling the laser beam generation portion to output the laser beam and controlling the laser beam generation portion to stop the output of the laser beam at least once in a second period scanning one image forming element (1, 2).
Claims20
A display device (100) comprising:
- a laser beam generation portion (12, 13, 14) supplied with current thereby outputting a laser beam;
- a projection portion (17) projecting an image formed by a plurality of image forming elements (1, 2) on an arbitrary projection area (2) by scanning said laser beam;
- and
- a control portion (15) continuously supplying current to said laser beam generation portion nonstop for a period longer than a first period when such relaxation oscillation occurs that the output of said laser beam becomes unstable at the initial lasing stage thereby controlling said laser beam generation portion to output said laser beam and controlling the supply of the current to said laser beam generation portion to stop the output of said laser beam at least once in a second period scanning one image forming element.
A portable apparatus (100) having a projector function, comprising a display device (100) including a laser beam generation portion (12, 13, 14) supplied with current thereby outputting a laser beam, a projection portion (17) projecting an image formed by a plurality of image forming elements (1, 2) on an arbitrary projection area (2) by scanning said laser beam and a control portion (15) continuously supplying current to said laser beam generation portion nonstop for a period longer than a first period when such relaxation oscillation occurs that the output of said laser beam becomes unstable at the initial lasing stage thereby controlling said laser beam generation portion to output said laser beam and controlling the supply of the current to said laser beam generation portion to stop the output of said laser beam at least once in a second period scanning one image forming element.
Dependencies are inferred from the claim text.