Pixel circuits for amoled displays
AssigneeIgnis Innovation Inc.
InventorsYaser Azizi, Gholamreza Chaji
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Abstract
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.
Claims17
1-10. (canceled)
A method of determining at least one characteristic of a first organic light emitting device (OLED) in a first pixel in pair of pixels in an array of pixels in a display in which each pixel includes, a drive transistor coupling a supply voltage source to an OLED for controlling the supply of current to the OLED from said supply voltage source, a voltage or current of the first OLED affecting measurements of a second OLED of a second pixel of the pair of pixels and a voltage or current of the second OLED affecting measurements of the first OLED, said display system including a monitor line controllably coupled to said pair of pixels, said method comprising:
- measuring a voltage or current over the monitor line generating one or more measurements;
- and
- determining the at least one characteristic of the first OLED with use of said one or more measurements taking into account the effect of the voltage or current of the first OLED on measurements of the second OLED and the effect of the voltage or current of the second OLED on measurements of the first OLED.
A system for determining at least one characteristic of a first organic light emitting device (OLED) in a first pixel of a pair of pixels in an array of pixels in a display in which each pixel includes a drive transistor coupling a supply voltage source to an OLED for controlling the supply of current to the OLED from said supply voltage source, a voltage or current of the first OLED affecting measurements of a second OLED of a second pixel of the pair of pixels and a voltage or current of the second OLED affecting measurements of the first OLED, said display system including a monitor line controllably coupled to said pair of pixels, said system comprising a controller adapted to:
- measure a voltage or current over the monitor line generating one or more measurements;
- and
- determine the at least one characteristic of the first OLED with use of said one or more measurements taking into account the effect of the voltage or current of the first OLED on measurements of the second OLED and the effect of the voltage or current of the second OLED on measurements of the first OLED.
Dependencies are inferred from the claim text.