Display backlighting systems and methods for adaptive pulse width modulation and modulo pulse width modulation

A control circuitry, comprising:

• an array of light emitting diodes (LEDs) having controllable brightness levels;
• and
• display driver circuitry for driving the array of light emitting diodes (LEDs), wherein the display driver circuitry is configured to generate for lower brightness levels below a threshold brightness level a PWM signal including at least one of a first modulo PWM signal that modifies a pulse width of one pulse for each line of a pulse train to generate a fractional pulse width for each line until the fractional pulse width is less than a minimum pulse width to illuminate the array of light emitting diodes (LEDs) or a second modulo PWM signal that partitions pulses of backlight updates into groups based on consecutive self-refresh cycles of a backlight update for controlling the brightness of the array of the LEDs.

An electronic device, comprising:

• an array of light-emitting diodes (LEDs);
• and
• driver circuitry coupled to the array of LEDs, wherein the driver circuitry is configured to generate a PWM signal based on a modified pulse-width modulated (PWM) code having PWM offset functionality to control the array of the light-emitting diodes with the PWM offset functionality, wherein the PWM offset functionality causes a positive or negative pulse width to be added to each pulse of the PWM signal that is added for improved linearity of the LEDs.

An electronic device, comprising:

• an array of light-emitting diodes (LEDs);
• and
• processing circuitry to execute an algorithm to determine a desired brightness level for the array of LEDs, to determine whether the desired brightness level is greater than a threshold brightness level, and to cause a pulse-width modulated (PWM) signal to be generated when the desired brightness level is below the threshold brightness level, and to cause a pulse-amplitude modulated (PAM) signal to be generated when the desired brightness level is greater than the threshold brightness level.