Projection video display apparatus and brightness adjustment method therefor
OwnerTooru Sugiyamainventor
Life of this patent
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Abstract
This invention is applied to a projection video display apparatus which causes a DMA to modulate light from a light source having a plurality of two-dimensionally arrayed LEDs in accordance with a video signal and projects the modulated video light onto a screen via a projection optical lens. The two-dimensionally arrayed LEDs are sequentially turned off from outside to inside when a drive device for ON/OFF-driving the LEDs of the light source is designated to darken the light source. Alternatively, the two-dimensionally arrayed light-emitting elements are sequentially turned on from inside to outside when the drive device is designated to brighten the light source.
Claims10
A projection video display apparatus comprising:
- a light source device which has two-dimensionally arrayed light-emitting elements;
- an optical space modulation element which receives light generated by the light source device, executes optical space modulation in accordance with a video signal, and outputs video light obtained by the optical space modulation;
- a projection device which projects the video light from the optical space modulation element to a screen via a projection optical lens;
- a light-emitting element driving device which ON/OFF-drives each of the light-emitting elements in the light source device;
- a designation device which designates a brightness level of the light source device;
- and
- an adjustment device which adjusts brightness of the light source device by controlling the ON/OFF driving operation of the light-emitting element driving device in accordance with the brightness level designated by the designation device,
- wherein the adjustment device compares the brightness level designated by the designation device with a current brightness level, controls the light-emitting element driving device to sequentially turn off the two-dimensionally arrayed light-emitting elements from outside to inside when the screen is designated to be darkened, and controls the light-emitting element driving device to sequentially turn on the two-dimensionally arrayed light-emitting elements from inside to outside when the screen is designated to be brightened.
A projection video display apparatus comprising:
- a plurality of light source devices each of which has two-dimensionally arrayed light-emitting elements, and emits one of three primary colors of R, G, and B;
- an optical space modulation element which sequentially receives light beams time-divisionally generated by said plurality of light source devices, executes optical space modulation in accordance with a video signal, and outputs video light obtained by the optical space modulation;
- a projection device which projects the video light from the optical space modulation element to a screen via a projection optical lens;
- a light-emitting element driving device which ON/OFF-drives the light-emitting elements in said plurality of light source devices;
- a designation device which designates a brightness level of the light source device;
- and
- an adjustment device which adjusts brightness of the light source device by controlling the ON/OFF driving operation of the light-emitting element driving device in accordance with the brightness level designated by the designation device,
- wherein the adjustment device compares the brightness level designated by the designation device with a current brightness level, controls the light-emitting element driving device to sequentially turn off the two-dimensionally arrayed light-emitting elements from outside to inside when the screen is designated to be darkened, and controls the light-emitting element driving device to sequentially turn on the two-dimensionally arrayed light-emitting elements from inside to outside when the screen is designated to be brightened.
A brightness adjustment method applied to a projection video display apparatus which modulates light generated by a light source which has two-dimensionally arrayed light-emitting elements by an optical space modulation element in accordance with a video signal, and projects video light obtained by the modulation onto a screen via a projection optical lens, comprising:
- designating a brightness level of the light source;
- and
- adjusting brightness of the light source by controlling the ON/OFF driving operation of the light-emitting element of the light source in accordance with the brightness level designated in the designating,
- wherein in the adjusting, the brightness level designated in the designating is compared with a current brightness level, the light-emitting element driving device is controlled to sequentially turn off the two-dimensionally arrayed light-emitting elements from outside to inside when the screen is designated to be darkened, and the light-emitting element driving device is controlled to sequentially turn on the two-dimensionally arrayed light-emitting elements from inside to outside when the screen is designated to be brightened.
A brightness adjustment method applied to a projection video display apparatus which has two-dimensionally arrayed light-emitting elements, and modulates light beams time-divisionally generated by said plurality of light source devices emitting three primary colors of R, G, and B, and projects the video light to a screen via a projection optical lens, comprising:
- designating a brightness level of the light source device;
- and
- adjusting brightness of the light source device by controlling the ON/OFF driving operation of the light-emitting elements of said plurality of the light source devices in accordance with the brightness level designated in the designating,
- wherein in the adjusting, the brightness level designated in the designating is compared with a current brightness level, the light-emitting element driving device is controlled to sequentially turn off the two-dimensionally arrayed light-emitting elements from outside to inside when the screen is designated to be darkened, and the light-emitting element driving device is controlled to sequentially turn on the two-dimensionally arrayed light-emitting elements from inside to outside when the screen is designated to be brightened.
Dependencies are inferred from the claim text.