Organic light emitting display device
In an organic light emitting display device which displays an image in a first mode or a second mode, the organic light emitting display device includes: a first scan driver which supplies a first scan signal having a first voltage to first scan lines; a second scan driver which supplies a second scan signal having a second voltage larger than the first voltage to second scan lines; and a pixel unit including pixels each coupled to a corresponding first scan line and a corresponding second scan line. When a first image displayed in the second mode is changed to a second image to be displayed in the second mode, the second image is displayed in the first mode during a predetermined portion of a period, in which the second image is displayed, and is displayed in the second mode during the remaining portion of the period.
1 . A light emitting display device comprising:
pixels;
a controller to drive the pixels according to an input image stream in a plurality of driving frequencies;
a first scan driver which supplies a first scan signal to first scan lines in response to a first scan driving control signal from the controller; and a second scan driver which supplies a second scan signal to second scan lines in response to a second scan driving control signal from the controller, wherein at least one of the pixels comprises:
a first transistor having a gate electrode coupled to a first node and coupled between a second node and a third node, the second node coupled to a first power source;
a light emitting diode having an anode electrode coupled to the third node and a cathode electrode coupled to a second power source node;
a second transistor coupled between a data line and the second node, and having a gate electrode coupled to one of the first scan lines;
a storage capacitor coupled between the first power source and the first node;
a third transistor coupled between the first node and the third node, and having a gate electrode coupled to one of the second scan lines that is different from the one of the first scan lines;
a fourth transistor coupled between the first node and an initialization power source, and having a gate electrode coupled to another one of the second scan lines; and
a seventh transistor coupled between the initialization power source and the anode electrode of the light emitting diode, and having a gate electrode coupled to a signal line different from the another one of the second scan lines, and
wherein the first and second transistors are poly-silicon semiconductor transistors, and the third, fourth, and seventh transistors are oxide semiconductor transistors, and
wherein the first scan signal applied to the gate electrode of the second transistor through the one of the first scan lines is different from the second scan signal applied to the gate electrode of the third transistor through the one of the second scan lines.
2 . The light emitting display device of claim 1 , wherein:
at least one of the pixels further comprises:
a fifth transistor coupled between the first power source and the second node; and
a sixth transistor coupled between the third node and the anode electrode of the light emitting diode; and
at least one of the fifth and sixth transistors has a gate electrode coupled to an emission control line, and
wherein the signal line coupled to the gate electrode of the seventh transistor is the emission control line.
3 . The light emitting display device of claim 2 , wherein both the gate electrodes of the fifth and sixth transistors are coupled to the emission control line.
4 . The light emitting display device of claim 1 , wherein, when the pixels are driven in a first driving frequency of the plurality of driving frequencies, the controller is configured to, in response to a transition of the input image stream from a first image to a second image, drive the pixels in a second driving frequency of the plurality of driving frequencies to display the second image before the pixels are driven in the first driving frequency to display the second image.
5 . The light emitting display device of claim 4 , wherein the controller is configured to drive the pixels in the first frequency to display the first image.
6 . The light emitting display device of claim 4 , wherein in response to the transition of the input image stream from the first image to the second image, the controller is configured to:
driving the pixels in the second frequency to display the second image during a first period; and driving the pixels in the first frequency to display the second image during a second period immediately after the first period.
7 . The light emitting display device of claim 6 , wherein the first period is an initial portion of the entire display period of the second image.
8 . The light emitting display device of claim 6 , wherein the controller is configured to drive the pixels to display one or more first frames in the second driving frequency during the first period, one or more first frames corresponding to the second image.
9 . The light emitting display device of claim 8 , wherein the controller is configured to drive the pixels to display one or more second frames in the first driving frequency during the second period, one or more second frames corresponding to the second image.
10 . The light emitting display device of claim 4 , wherein the second driving frequency is higher than the first driving frequency.
11 . The light emitting display device of claim 4 , wherein the input image stream comprises a first input image having the first image and a second input image having the second image, the second input image following the first input image.
12 . The light emitting display device of claim 4 , wherein the second image is different from the first image.
13 . The light emitting display device of claim 4 , wherein each of the first image and the second image is a static image.