Pixel Circuit
AssigneeCambridge Display Technology Limited
InventorEuan C. Smith
Life of this patent
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Abstract
A pixel driver circuit for active matrix driving of an organic light emitting diode (OLED) comprises a drive transistor having a current path connected to a first voltage supply line at one end and to an OLED at the other end and a gate terminal connected to a storage element connected between gate and source of the drive transistor to memorize a drive signal for the drive transistor under the control of a first switch transistor having a gate connection to a first selection line and a current path connected between gate and drain of the drive transistor, and a second switch transistor having a gate connection to a second selection line, wherein the second switch transistor has a current path connected to the data line at one end and a node at the other end located between the drive transistor and the OLED.
Claims27
A pixel driver circuit for driving an organic light-emitting diode (OLED) comprising:
- a first selection line;
- a second selection line;
- a data line;
- a first voltage supply line;
- and
- a drive transistor having a current path connected to the first voltage supply line at one end and the OLED at the other end and a gate terminal connected to a storage element connected between gate and source of the drive transistor to memorize a drive signal for the drive transistor under the control of a first switch transistor having a gate connection to the first selection line and a current path connected between gate and drain of the drive transistor;
- and, a second switch transistor having a gate connection to the second selection line, wherein the second switch transistor has a current path connected to the data line at one end and a node at the other end located between the drive transistor and the OLED.
A pixel driver circuit as claimed in 2, wherein the first and second selection lines are common.
A pixel driver circuit for driving an organic light-emitting diode (OLED) comprising:
- a first selection line;
- a data line;
- a first voltage supply line;
- and
- a drive transistor having a current path connected to the first voltage supply line at one end and the OLED at the other end and a gate terminal connected to a storage element connected to the data line to memorize a drive signal for the drive transistor under the control of first and second switch transistors having gate connections to the first selection line;
- and,
- a third switch transistor having a gate connection to a second selection line, wherein the third switch transistor is located in the current path of the drive transistor in series between the OLED and drive transistor.
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Dependencies are inferred from the claim text.