Organic light emitting diode driver

摘要

Disclosed are controllable drive circuits for powering an organic light emitting diode (OLED) or other electronic load. According to one implementation, a circuit structure is provided that applies a pulse width modulated (PWM) drive current to an OLED. The time-average drive current to the OLED can be modulated in accordance with a periodically sampled control signal. In turn, the luminance of the OLED can be suitably varied over a control range. Circuit structures provided may be fabricated at least in part on a common substrate such that respective integrated circuit devices are defined. In one or more implementations, at least a portion of drive circuits may be fabricated within a 65 nanometer (or smaller) environment.

主权项

1. An electronic circuit, comprising:
a first transistor; a second transistor; a charge storage device, wherein the first transistor, the second transistor and the charge storage device are cooperatively configured to provide a pulse width modulated (PWM) drive current to a load in accordance with a periodic ramp signal and a control signal coupled to the charge storage device via the second transistor; and a third transistor configured to directly receive the periodic ramp signal, the third transistor coupled between the charge storage device and the load, and configured to conduct current from the charge storage device to the load at least partially based on the periodic ramp signal.