Patent ID: 8779689

Claim:
An electronic driver apparatus for powering an OLED array, comprising: a DC-DC converter with an input receiving DC input power and an output, the DC-DC converter comprising: first and second switching devices coupled in series between first and second DC input terminals, the first and second switching devices being joined at an internal node, a driver including a driver control input, the driver operative to provide first and second switch control signals in complementary fashion to the first and second switching devices, respectively, at least partially according to a signal received at the driver control input, a filter circuit coupled between the internal node and the DC-DC converter output, and a PWM circuit, comprising: an error amplifier with a first input receiving a converter setpoint signal, a second input receiving a feedback signal representing current supplied to the driven OLED array, and an error amplifier output providing an error signal representing a difference between the converter setpoint signal and the feedback signal, and a PWM controller with an input connected to the error amplifier output to receive the error signal, the PWM controller operative to provide a pulse width modulated signal to the driver control input according to the error signal; and a waveform generator receiving an input setpoint signal, the waveform generator operative to provide the converter setpoint signal to the PWM circuit at least partially according to the input setpoint signal, the converter setpoint signal having rise time values of 1 us or more and 10 ms or less and fall time values of his or more and 10 ms or less.