Voltage-programming scheme for current-driven AMOLED displays

摘要

A system and method for driving an AMOLED display is provided. The AMOLED display includes a plurality of pixel circuits. A voltage-programming scheme, a current-programming scheme or a combination thereof is applied to drive the display. Threshold shift information, and/or voltage necessary to obtain hybrid driving circuit may be acquired. A data sampling may be implemented to acquire a current/voltage relationship. A feedback operation may be implemented to correct the brightness of the pixel.

主权项

1. A system for programming at least one pixel circuit in a display, the system comprising:
a voltage driver for generating a current or a voltage to apply to a data node of the at least one pixel circuit to thereby program the at least one pixel circuit according to the generated current or voltage; a programmable current source for providing a first current and a second current to apply to the data node of the at least one pixel circuit; a sampler for reading a first voltage on the data node while the first current is maintained through the at least one pixel circuit via the programmable current source and for reading a second voltage on the data node while the second current is maintained through the at least one pixel circuit via the programmable current source; and a controller configured to:
generate a voltage versus current relationship for the at least one pixel circuit based on the first current and the second current and based on the sampled first and second voltages,extract, based on the voltage versus current relationship for the at least one pixel circuit, a voltage corresponding to a zero current level, andprogram the at least one pixel circuit via the data node with a programming current or voltage generated by the voltage driver that is set according to display data and according to the extracted voltage corresponding to the zero current level.