Emission driver for organic light emitting display device
AssigneeSamsung Mobile Display Co., Ltd.
InventorBo-Yong Chung
Life of this patent
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Abstract
An emission driver for an organic light emitting display device is disclosed. The emission driver includes a plurality of flip-flops, and each flip-flop selectively receives two input signals and inverts a level of a received input signal. Also, each flip-flop transmits the level-inverted signal to an adjacent flip-flop, inverts the level-inverted signal, and transmits the inverted level-inverted signal to the adjacent flip-flop and as an emission control signal. To invert the level of the received input signal, the emission driver includes a level shifter, which includes transistors of the same conductivity type arranged to reduce power consumption.
Claims16
An emission driver for an organic light emitting display device, comprising:
- a plurality of flip-flops coupled together in series,
- wherein a first flip-flop comprises:
- a first switching unit to transmit a first input signal in response to a first clock signal;
- a level shifter to receive the first input signal from the first switching unit and to output an output signal with an inverted level of the first input signal;
- a second switching unit to receive the output signal and to transmit the output signal to a second flip-flop in response to a second clock signal;
- and
- an inverter to invert the output signal to generate an emission control signal and transmit the emission control signal to the second flip-flop.
A method of forming an emission control signal, comprising:
- outputting a first output signal and a first inverted output signal from a first flip-flop to a second flip-flop;
- and
- outputting a second output signal and second inverted output signal from the second flip-flop,
- wherein the second output signal is delayed by one clock cycle with respect to the first output signal and wherein the first flip-flop comprises:
- a first switching unit to transmit a first input signal in response to a first clock signal;
- a level shifter to receive the first input signal from the first switching unit and to output the first output signal with an inverted level of the first input signal;
- a second switching unit to receive the first output signal and to transmit the first output signal to a second flip-flop in response to a second clock signal;
- and an inverter to invert the first output signal to generate an emission control signal and transmit the emission control signal to the second flip-flop.
Dependencies are inferred from the claim text.