Display apparatus power management controller and methods of operation thereof

A method for providing power to a light source from a power management integrated circuit (PMIC), the PMIC having an output terminal to which the light source and a capacitor are coupled, comprising:

• determining an output sequence for displaying a first plurality of subframes during a first time period and a second plurality of subframes during a second time period according to a time division multiplexing image formation process, the output sequence indicating light source illumination levels and durations for each of the first and second plurality of subframes;
• providing a plurality of current pulses to the light source from the PMIC, the plurality of current pulses corresponding to the first and the second plurality of subframes;
• drawing a first substantially constant current from a DC voltage source powering the PMIC and providing a first substantially constant output current over substantially the entirety of the first time period;
• and
• drawing a second substantially constant current, different from the first substantially constant current, from the DC voltage source and providing a second substantially constant output current over substantially the entirety of the second time period.

An apparatus comprising:

• first light emitting means for emitting light of a first color responsive to current flow, including a first terminal and a second terminal, wherein the first terminal is coupled to a first capacitor;
• and
• a power management device receiving power from a DC voltage source, including:
• first digital-to-analog converting (DAC) means coupled to the first terminal of the first light emitting means for causing a plurality of current pulses to flow from the first light emitting means to illuminate the first light emitting means for a first plurality of subframes during a first time period and for a second plurality of subframes during a second time period, and
• first programmable DC/DC converting means, an output of which is coupled to the second terminal of the first light emitting means and to the first capacitor, for drawing a first substantially constant current from the DC voltage source and provide a first substantially constant output current over substantially the entirety of the first time period and for drawing a second substantially constant current, different from the first substantially constant current, from the DC voltage source and provide a second substantially constant output current over substantially the entirety of the second time period.

A non-transitory computer readable storage medium having instructions encoded thereon, which when executed by a processor cause the processor to perform a method for providing power to a light source from a power management integrated circuit (PMIC), the PMIC having an output terminal to which the light source and a capacitor are coupled, comprising:

• determining an output sequence for displaying a first plurality of subframes during a first time period and a second plurality of subframes during a second time period according to a time division multiplexing image formation process, the output sequence indicating light source illumination levels and durations for each of the first and second plurality of subframes;
• providing a plurality of current pulses to the light source from the PMIC, the plurality of current pulses corresponding to the first and the second plurality of subframes;
• drawing a first substantially constant current from a DC voltage source powering the PMIC and providing a first substantially constant output current over substantially the entirety of the first time period;
• and
• drawing a second substantially constant current, different from the first substantially constant current, from the DC voltage source and providing a second substantially constant output current over substantially the entirety of the second time period.