LED BRIGHTNESS CONTROL
First Claim
Patent Images
1. A device for use in controlling one or more LEDs (light emitting diodes), comprising:
- a modulator having at least 11 bits of pulse width modulation resolution;
a buffer adapted to receive pulses from the modulator; and
a buffer output that provides pulses from the buffer adapted for connection to a driver.
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Abstract
A device for controlling the brightness of a one or more LEDs (light emitting diodes) includes a modulator having at least 11 bits of pulse width modulation resolution. A buffer receives pulses from the modulator. A driver may be coupled to receive pulses from the buffer and drive the one or more LEDs. A currently limiter may be employed to prevent damage to the one or more LEDs. An update rate may be selected to limit perceptible flicker of the one or more LEDs.
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Citations
22 Claims
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1. A device for use in controlling one or more LEDs (light emitting diodes), comprising:
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a modulator having at least 11 bits of pulse width modulation resolution;
a buffer adapted to receive pulses from the modulator; and
a buffer output that provides pulses from the buffer adapted for connection to a driver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device comprising:
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one or more LEDs (light emitting diodes);
a modulator having at least 11 bits of pulse width modulation resolution while maintaining an update rate fast enough to preclude perceptible flicker;
a buffer adapted to receive pulses from the modulator; and
a driver that receives pulses from the buffer and provides them to the one or more LEDs.
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10. A device for controlling one or more LEDs (light emitting diodes), the device comprising:
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a modulator having at least 11 bits of pulse width modulation resolution while maintaining an update rate fast enough to preclude perceptible flicker;
a buffer coupled to the modulator and adapted to receive pulses from the modulator; and
a driver that receives pulses from the buffer and having an output for coupling to the one or more LEDs. - View Dependent Claims (11, 12, 13)
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15. A method for controlling one or more LEDs (light emitting diodes), the method comprising:
- receiving a control signal having at least 11 bits of pulse width modulation resolution and an update rate that precludes flicker over a wide dimming range;
buffering the control signal using a buffer that operates with a response time at least as fast as the shortest duration pulse of said control signal to obtain a buffered control signal; and
making the buffered control signal available to a driver to drive the one or more LEDs according to said buffered control signal. - View Dependent Claims (16, 17)
- receiving a control signal having at least 11 bits of pulse width modulation resolution and an update rate that precludes flicker over a wide dimming range;
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18. A method for controlling the brightness of a LED device, the method comprising:
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receiving a pulse width modulated control signal representative of a desired LED device brightness and having at least 11 bit resolution and an update rate that prevents flicker;
supplying power to the LED device in accordance with said pulse width modulated control signal; and
preventing a magnitude of current drawn by the LED device from exceeding a predetermined threshold value while maintaining continued operation of the LED device. - View Dependent Claims (19)
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20. A device for use in controlling one or more LEDs (light emitting diodes), comprising:
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a modulator having a dimming resolution of at least 211;
a buffer adapted to buffer pulses from the modulator; and
a buffer output adapted to provide pulses from the modulator to a driver. - View Dependent Claims (21, 22)
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Specification