Hybrid pulse-width-modulation pixels
AssigneeDaktronics, Inc.
InventorsImre Knausz, Ronald S. Cok
Life of this patent
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Abstract
A hybrid pulse-width-modulation pixel includes a light controller responsive to a variable power signal specifying different powers and a pixel controller. The pixel controller is operable receive a pixel luminance signal comprising multiple bits specifying a desired light-controller luminance, generate the variable power signal in response to the pixel luminance signal, and drive the light controller to emit light at different luminances in response to the variable power signal for different time periods. The pixel controller is operable to provide the variable power signal at a constant first power for a first time period and provide the variable power signal at a constant second power different from the constant first power for a second time period.
Claims11
A method of controlling a pixel, the method comprising:
- receiving, by a pixel controller, a pixel luminance signal comprising multiple binary bits specifying a desired light-controller luminance for a frame period;
- generating, by the pixel controller, a digital variable power signal in response to the pixel luminance signal;
- and
- driving a light controller with the pixel controller to provide light at different constant luminances with different constant non-zero amounts of power for different time periods within the frame period in response to the digital variable power signal, wherein the different constant non-zero amounts of power for the different time periods comprise a constant first power for a first time period and at a non-zero constant second power that is different from the constant first power for a second time period,
- wherein the digital variable power signal specifies (i) a pulse-width-modulation signal having two or more different pulse periods during which the constant first power is provided and (ii) a power signal for the second time period.
Dependencies are inferred from the claim text.