Image Display Device
First Claim
1. An image display device that displays an image on a projection surface using scanning with laser light involving a variation in scanning speed, comprising:
- a laser light source that emits the laser light with an output level corresponding to a display grayscale of a pixel within a pixel display period which is set to increase as the scanning speed is reduced, such that a total time of a unique relaxation oscillation of the laser light source increases as the scanning speed is reduced; and
a scanning mirror that reflects the laser light emitted from the laser light source according to its deflection angle in a predetermined scanning order so as to be projected onto the projection surface.
1 Assignment
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Accused Products
Abstract
Provided is a technique capable of effectively reducing local speckle noise caused by scanning with laser light involving a variation in scanning speed and improving the overall quality of an image.
A laser light source emits laser light with an output level Lc corresponding to a display grayscale of a pixel according to a predetermined waveform pattern PT within a pixel display period which is set to increase as a scanning speed Vh is reduced. The waveform pattern PT is set such that a unique relaxation oscillation of the laser light source increases as the scanning speed Vh is reduced. A scanning mirror reflects the laser light emitted from the laser light source in a predetermined scanning order according to its deflection angle so as to be projected onto a projection surface.
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Citations
12 Claims
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1. An image display device that displays an image on a projection surface using scanning with laser light involving a variation in scanning speed, comprising:
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a laser light source that emits the laser light with an output level corresponding to a display grayscale of a pixel within a pixel display period which is set to increase as the scanning speed is reduced, such that a total time of a unique relaxation oscillation of the laser light source increases as the scanning speed is reduced; and a scanning mirror that reflects the laser light emitted from the laser light source according to its deflection angle in a predetermined scanning order so as to be projected onto the projection surface. - View Dependent Claims (6)
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2. An image display device that displays an image on a projection surface using scanning with laser light involving a variation in scanning speed, comprising:
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a laser control unit that selects a first waveform pattern for generating a unique relaxation oscillation of a laser light source within a first pixel display period for a first pixel and selects a second waveform pattern for generating a larger number of relaxation oscillations than the first waveform pattern within a second pixel display period longer than the first pixel display period for a second pixel which is scanned at a lower scanning speed than the first pixel; a laser light source that emits the laser light with an output level corresponding to a display grayscale of the first pixel according to the first waveform pattern selected by the laser control unit and emits the laser light with an output level corresponding to a display grayscale of the second pixel according to the second waveform pattern selected by the laser control unit; and a scanning mirror that reflects the laser light related to the first pixel which is emitted from the laser light source and the laser light related to the second pixel which is emitted from the laser light source in a predetermined scanning order according to its deflection angle so as to be projected onto the projection surface. - View Dependent Claims (9)
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3. An image display device that displays an image on a projection surface using scanning with laser light involving a variation in scanning speed, comprising:
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a laser control unit that selects a first waveform pattern including at least one on period which rises from an off state within a first pixel display period for a first pixel and selects a second waveform pattern including a larger number of on periods rising from the off state than the first waveform pattern within a second pixel display period longer than the first pixel display period for a second pixel which is scanned at a lower scanning speed than the first pixel; a laser light source that emits the laser light with an output level corresponding to a display grayscale of the first pixel according to the first waveform pattern selected by the laser control unit and emits the laser light with an output level corresponding to a display grayscale of the second pixel according to the second waveform pattern selected by the laser control unit; and a scanning mirror that reflects the laser light related to the first pixel which is emitted from the laser light source and the laser light related to the second pixel which is emitted from the laser light source in a predetermined scanning order according to its deflection angle so as to be projected onto the projection surface. - View Dependent Claims (4, 5, 7, 8, 10, 11, 12)
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Specification