System and method for intensity control of a pixel
First Claim
1. A system for intensity control of a pixel having 2N gray-scale tones, comprising:
- a pixel having 2s subpixels, two of the subpixels with the lowest light output having a light output ratio of about 1;
1; and
a driver to apply a pulse-width modulated waveform to the subpixels, the modulated waveform having 2N-s pulses of different pulse widths.
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Accused Products
Abstract
An LCOS chip may have a pixel divided into an outer subpixel and an inner subpixel. A driver may independently drive the subpixels. The driving technique may be pulse-width modulation. Because of the pixel is divided into subpixels, pulses of short widths that drive an undivided pixel may be replaced with pulses of longer duration. In an alternative embodiment, the pixel is not divided into subpixels. The driving technique may be a combination of pulse width and pulse height modulation. The waveform may replace pulses of short widths with pulses of longer duration and reduced voltage levels.
27 Citations
22 Claims
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1. A system for intensity control of a pixel having 2N gray-scale tones, comprising:
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a pixel having 2s subpixels, two of the subpixels with the lowest light output having a light output ratio of about 1;
1; and
a driver to apply a pulse-width modulated waveform to the subpixels, the modulated waveform having 2N-s pulses of different pulse widths. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for intensity control of a pixel, comprising:
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a first subpixel;
a second subpixel, the first subpixel and the second subpixel having a light output ratio of about 1;
1; and
a driver to apply a pulse-width modulated waveform to the first subpixel and the second subpixel, the modulated waveform having a first pulse and a second pulse, the first pulse being applied to the first subpixel and the second pulse being applied to the first subpixel and the second subpixel. - View Dependent Claims (8, 9, 10, 11, 13, 14, 15, 17, 18, 19)
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12. A method of intensity control of a pixel, comprising:
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applying a first pulse with a first width to a first subpixel of the pixel to produce a first gray-scale tone; and
applying a second pulse with the first width to the first subpixel and a second subpixel of the pixel to produce a second gray-scale tone.
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16. A system for intensity control of a pixel, comprising:
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a pixel; and
a driver to apply a pulse-width and amplitude modulated waveform to the pixel, the modulated waveform having at least two pulses of different pulse widths, a first one of the at least two pulses having a first width and a first amplitude and a second one of the at least two pulses having about the first width and a second amplitude greater than the first amplitude, the first pulse being applied to the pixel to produce a first gray-scale tone and the second pulse being applied to the pixel to produce a second gray-scale tone.
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20. A method of intensity control of a pixel, comprising:
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applying a first pulse with a first width and a first amplitude to the pixel to produce a first gray-scale tone; and
applying a second pulse with the first width and a second amplitude of about twice the first amplitude to the pixel to produce a second gray-scale tone. - View Dependent Claims (21, 22)
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Specification