Patent ID: 11361707

Abstract:
A display driver has current reference units and current-generating units. Each current reference unit generates a reference current and scaling it to form a scaled reference current. Each current-generating unit generates an output current from one scaled reference current to drive a selected light emitter (LE) of a LE matrix over a time slice allocated for driving the selected LE. Each current-generating unit has a switching circuit modulating the scaled reference current according to a switching sequence to form output current pulses to drive a LE. The processor determines the switching sequence to avoid a shortest current pulse shorter than a minimum current pulse width via (a) calculating a duty cycle as a ratio of an average output current to the scaled reference current, (b) mapping the duty cycle to a modulation sequence, and (c) repeating stretching a time duration of the modulation sequence by double, splitting the modulation sequence into half, and allocating the split sequence into two times of original time slice, until the shortest current pulse satisfies the above-mentioned requirement.