Emission control driver and organic light emitting display device having the same

Patent metadata

Field	Value
Publication number	US-9548026-B2
Application number	US-201313781861-A
Country	US
Kind code	B2
Filing date	Mar 1, 2013
Priority date	Aug 21, 2012
Publication date	Jan 17, 2017
Grant date	Jan 17, 2017

Abstract

An emission control driver includes stages sequentially outputting emission control signals through emission control lines. Each stage includes a first signal processor receiving a first voltage and generating first and second signals in response to first and second sub-control signals, a second signal processor receiving a second voltage having a level higher than a level of the first voltage and generating third and fourth signals in response to the third sub-control signal, the first signal, and the second signal, and a third signal processor receiving the first and second voltages and generating the emission control signal in response to the third and fourth signals. The first signal processor of each stage receives the emission control signal output from a previous stage as the first sub-control signal, and the first signal processor of a first stage among the stages receives a start signal as the first sub-control signal.

First claim

What is claimed is:

1. An emission control driver, comprising:
a plurality of stages that sequentially outputs emission control signals through emission control lines, each stage including:
a first signal processing circuit that receives a first voltage and outputs first and second signals in response to first and second sub-control signals;
a second signal processing circuit that receives a second voltage having a level higher than a level of the first voltage and outputs third and fourth signals in response to a third sub-control signal, the first signal, and the second signal; and
a third signal processing circuit that receives the first and second voltages and outputs the emission control signal in response to the third and fourth signals, wherein:
the first signal processing circuit of a first stage among the stages receives a start signal as the first sub-control signal,
the first signal processing circuit of each stage except the first stage receives the emission control signal output from a previous stage as the first sub-control signal,
wherein:
the fourth signal changes from a second level to a third level at a time point at which the third sub-control signal changes from a first level to the second level, and
the fourth signal changes from the second level to the first level at a time point at which the start signal changes from the second level to the first level, the second level lower than the first level, and the third level lower than the second level.

2. The emission control driver as claimed in claim 1 , wherein:
the first signal processing circuit of each of odd-numbered stages of the stages receives a first clock signal as the second sub-control signal,
the second signal processing circuit of each of the odd-numbered stages of the stages receives a second clock signal as a third sub-control signal,
the first signal processing circuit of each of even-numbered stages of the stages receives the second clock signal as the second sub-control signal, and
the second signal processing circuit of each of the even-numbered stages of the stages receives the first clock signal as the third sub-control signal.

3. The emission control signal as claimed in claim 2 , wherein the first and second clock signals have a same frequency and the second clock signal is obtained by shifting the first clock signal by a first duration corresponding to a half of a period of the first clock signal.

4. The emission control driver as claimed in claim 3 , wherein the start signal is activated at a time point at which the first clock signal changes from the first level to the second level smaller than the first level, and the activation of the start signal is maintained during a second duration corresponding to four times of the first duration.

5. The emission control driver as claimed in claim 3 , wherein each of the light emission control signals has the level of the second voltage during a third duration that is three times the first duration and the emission control signals are sequentially shifted by the first duration.

6. The emission control driver as claimed in claim 2 , wherein the first signal processing circuit comprises:
a first transistor having a gate terminal applied with the second sub-control signal and a first terminal applied with the first sub-control signal;
a second transistor having a gate terminal connected to a second terminal of the first transistor and a second terminal applied with the second sub-control signal;
a third transistor having a gate terminal applied with the second sub-control signal, a first terminal connected to a first terminal of the second transistor, and a second terminal applied with the first voltage, wherein
the first signal is output from the first terminals of the second and third transistors, which are connected to each other, and the second signal is output from the second terminal of the first transistor.

7. The emission control driver as claimed in claim 6 , wherein the second signal processing circuit comprises:
a fourth transistor having a gate terminal applied with the third sub-control signal and a second terminal connected to a first node and the second terminal of the first transistor
a first capacitor having a first electrode applied with the third sub-control signal and a second electrode connected to the second terminal of the fourth transistor;
a fifth transistor having a gate terminal connected to the first terminal of the third transistor and a second node, a first terminal applied with the second voltage, and a second terminal connected to a first terminal of the fourth transistor;
a sixth transistor having a gate terminal connected to the second node and a second terminal applied with the third sub-control signal;
a second capacitor having a first electrode connected to the gate terminal of the sixth transistor and a second electrode connected to a first terminal of the sixth transistor; and
a seventh transistor having a gate terminal applied with the third sub-control signal, a first terminal connected to a third node, and a second terminal connected to the first terminal of the sixth transistor, wherein the third signal is applied to the third node and the fourth signal is applied to the first node.

8. The emission control driver as claimed in claim 7 , wherein the third signal processing circuit comprises:
an eighth transistor having a gate terminal connected to the first node, a first terminal applied with the second voltage, and a second terminal connected to the third node;
a third capacitor having a first electrode applied with the second voltage and a second electrode connected to the third node;
a ninth transistor having a gate terminal connected to the third node, a first terminal applied with the second voltage, and a second terminal connected to a corresponding emission control line; and
a tenth transistor having a gate terminal connected to the first node, a first terminal connected to the corresponding emission control line, and a second terminal applied with the first voltage, wherein the second terminal of the ninth transistor and the first terminal of the tenth transistor are connected to a first terminal of a first transistor of a first signal processing circuit of a next stage.

9. An organic light emitting display device, comprising:
a display panel that includes a plurality of pixels each being connected to a corresponding scan line of scan lines, a corresponding data line of data lines, and a corresponding emission control line of emission control lines;
a scan driver that sequentially applies scan signals to the pixels through the scan lines;
a data driver that applies data voltages to the pixels through the data lines; and
an emission control driver that includes a plurality of stages sequentially applying emission control signals to the pixels through the emission control lines, each of the stages including:
a first signal processing circuit that receives a first voltage and outputs first and second signals in response to first and second sub-control signals;
a second signal processing circuit that receives a second voltage having a level higher than a level of the first voltage and outputs third and fourth signals in response to a third sub-control signal, the first signal, and the second signal; and
a third signal processing circuit that receives the first and second voltages and outputs the emission control signal in response to the third and fourth signals, wherein:
the first signal processing circuit of a first stage among the stages receives a start signal as the first sub-control signal,
the first signal processing circuit of each stage except the first stage receives the emission control signal output from a p

Assignees

• Jang Hwan Soo
• Samsung Display Co Ltd

Inventors

• Jang Hwan Soo

Classifications

• G09G3/3266 Primary

  Details of drivers for scan electrodes · CPC title

• G09G3/3291 Primary

  in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements · CPC title

• G09G2310/0286

  Details of a shift registers arranged for use in a driving circuit · CPC title

• G09G2310/0202

  Addressing of scan or signal lines · CPC title

• G09G2310/0262

  The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes · CPC title