Laser projection display device, and method for controlling laser lightsource driving unit used for same
First Claim
1. A laser projection display device that projects laser light beams of a plurality of colors corresponding to image signals and displays an image corresponding to the image signals, comprising:
- a laser light source that generates the laser light beams of the plurality of colors;
a laser light source driver configured to modulate the laser light source;
an optical sensor that detects an amount of light of the laser light beams which are generated by the laser light source; and
an image processor configured to process the image signals and to supply a plurality of drive signals to the laser light source driver on the basis of the amount of light of the laser light beams detected by the optical sensor, the drive signals including the processed image signals and a threshold current value,wherein the image processor is further configured to;
when the image is displayed with a first luminance, update the threshold current value in a first execution cycle and supply the threshold current value, which is updated in the first execution cycle, to the laser light source driver,when changing luminance of the image from the first luminance to a second luminance, update the threshold current value based on an average current level (ACL) of the image and supply the threshold current value to the laser light source driver, andfor a predetermined period after the luminance of the image is changed from the first luminance to the second luminance, update the threshold current value in a second execution cycle, that is shorter than the first execution cycle, and supply the threshold current value, which is updated in the second execution cycle, to the laser light source driver.
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Abstract
The laser projection display device includes: a photo-sensor for detecting the quantity of laser light generated by the laser light source; and an image processing unit for processing a drive signal on the basis of the quantity of light of the detected laser light and supplying the processed drive signal to a driving unit for the laser light source. Right after the dimming, the image processing unit supplies the drive signal to the driving unit for the laser light source on the basis of the quantity of light of the detected laser light within a second execution cycle shorter than a first execution cycle which is the execution cycle used during the normal operation.
44 Citations
19 Claims
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1. A laser projection display device that projects laser light beams of a plurality of colors corresponding to image signals and displays an image corresponding to the image signals, comprising:
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a laser light source that generates the laser light beams of the plurality of colors; a laser light source driver configured to modulate the laser light source; an optical sensor that detects an amount of light of the laser light beams which are generated by the laser light source; and an image processor configured to process the image signals and to supply a plurality of drive signals to the laser light source driver on the basis of the amount of light of the laser light beams detected by the optical sensor, the drive signals including the processed image signals and a threshold current value, wherein the image processor is further configured to; when the image is displayed with a first luminance, update the threshold current value in a first execution cycle and supply the threshold current value, which is updated in the first execution cycle, to the laser light source driver, when changing luminance of the image from the first luminance to a second luminance, update the threshold current value based on an average current level (ACL) of the image and supply the threshold current value to the laser light source driver, and for a predetermined period after the luminance of the image is changed from the first luminance to the second luminance, update the threshold current value in a second execution cycle, that is shorter than the first execution cycle, and supply the threshold current value, which is updated in the second execution cycle, to the laser light source driver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A laser projection display device that projects laser light beams of a plurality of colors corresponding to image signals and displays an image corresponding to the image signals, comprising:
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a laser light source that generates the laser light beams of the plurality of colors; a laser light source driver configured to modulate the laser light source; an optical sensor that detects an amount of light of the laser light beams which are generated by the laser light source; and an image processor configured to process the image signals and to supply a plurality of drive signals to the laser light source driver on the basis of the amount of light of the laser light beams detected by the optical sensor, the drive signals including the processed image signals and a current gain value, wherein the image processor is further configured to; when the image is displayed with a first luminance, update the current gain value in a first execution cycle and supply the current gain value, which is updated in the first execution cycle, to the laser light source driver, when changing luminance of the image from the first luminance to a second luminance, update the current gain value based on an average current level (ACL) of the image and supply the current gain value to the laser light source driver, and for a predetermined period after the luminance of the image is changed from the first luminance to the second luminance, update the current gain value in a second execution cycle, that is shorter than the first execution cycle, and supply the current gain value, which is updated in the second execution cycle, to the laser light source driver. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for controlling a laser light source driver that modulates a laser light source of a laser projection display device that projects laser light beams of a plurality of colors corresponding to image signals and displays an image, the method comprising:
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supplying a plurality of drive signals to the laser light source driver to modulate the laser light source, the drive signals including the processed image signals and at least one current value; when the image is displayed with a first luminance, updating the at least one current value in a first execution cycle and supply the at least one current value, which is updated in the first execution cycle, to the laser light source driver; when changing luminance of the image from the first luminance to a second luminance, updating the at least one current value based on an average current level (ACL) of the image and supply the at least one current value to the laser light source driver; and for a predetermined period after the luminance of the image is changed from the first luminance to the second luminance, updating the at least one current value in a second execution cycle, that is shorter than the first execution cycle, and supplying the at least one current value, which is updated in the second execution cycle, to the laser light source driver, wherein the at least one current value includes one of a threshold current value and a current gain value. - View Dependent Claims (18, 19)
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Specification