PIXEL CIRCUITS FOR AMOLED DISPLAYS
A method and system determine the characteristics of drive devices and load devices in selected pixels in an array of pixels in a display in which each pixel includes a drive device for supplying current to a load device. The method and system supply current to the load device via the drive device in a selected pixel, the current being a function of a current effective characteristic of at least one of the drive device and the load device; measure the current via a measurement line that is shared by adjacent pixels, and extract the value of a selected effective characteristic of one of the drive and load devices from the effect of the current on another of the drive and load devices. Current may be measured via a read transistor in each pixel.
1 . A method of determining the characteristics of drive devices and load devices in selected pixels in an array of pixels in a display in which each pixel includes a drive device for supplying current to a load device, said method comprising
supplying current to said load device via said drive device in a selected pixel, said current being a function of a current effective characteristic of at least one of the drive device and the load device,
measuring said current via a measurement line that is shared by adjacent pixels, and
extracting the value of a selected effective characteristic of one of said drive and load devices from the effect of said current on another of said drive and load devices.
2 . The method of claim 1 in which said load devices are optoelectronic devices.
3 . The method of claim 1 in which said current is supplied to said load device in each pixel via a drive device in each pixel.
4 . The method of claim 1 in which said current is measured via a read transistor in each pixel.
5 . The method of claim 1 in which the current is measured in different stages, and the selected effective characteristic is extracted from the measurements.
6 . A system for determining the characteristics of drive devices and load devices in selected pixels in an array of pixels in a display in which each pixel includes a drive device for supplying current to a load device, the system comprising a controller adapted to
supply current to said load device via said drive device in a selected pixel, said current being a function of a current effective characteristic of at least one of the drive device and the load device,
measure said current via a measurement line that is shared by adjacent pixels, and
extract the value of a selected effective characteristic of one of said drive and load devices from the effect of said current on another of said drive and load devices.
7 . The system of claim 6 in which said load devices are optoelectronic devices.
8 . The system of claim 6 in which said current is supplied to said load device in each pixel via a drive device in each pixel.
9 . The system of claim 6 in which said current is measured via a read transistor in each pixel.
10 . The system of claim 6 in which the current is measured in different stages, and the selected effective characteristic is extracted from the measurements.