Organic light emitting display and method of driving the same

Patent metadata

Field	Value
Publication number	US-9159257-B2
Application number	US-201113200399-A
Country	US
Kind code	B2
Filing date	Sep 23, 2011
Priority date	Oct 28, 2010
Publication date	Oct 13, 2015
Grant date	Oct 13, 2015

Abstract

The organic light emitting display includes a plurality of pixels positioned at intersections of scan lines, emission control lines, and data lines, a scan driver for sequentially supplying scan signals to the scan lines at a first driving frequency in order to select the pixels in units of horizontal lines, and an emission driver for sequentially supplying emission control signals to the emission control lines at a second driving frequency different from the first driving frequency in order to control emission of the pixels.

First claim

What is claimed is:

1. An organic light emitting display, comprising:
a plurality of pixels positioned at intersections of scan lines, emission control lines, and data lines, the plurality of pixels arranged in at least three of rows and a plurality of columns;
a scan driver to sequentially supply scan signals to the scan lines at a first driving frequency to select the pixels in units of horizontal lines; and
an emission driver to sequentially supply emission control signals to the emission control lines at a second driving frequency to control emission of the pixels, wherein
the scan signals and the emission control signals are sequentially supplied by a frame, and a slope of supply of the scan signals is substantially different from a slope of supply of the emission control signals, wherein
the slope of supply of the scan signals is inversely proportional to an interval between adjacent scan signals, and the slope of supply the emission control signals is inversely proportional to an interval between adjacent emission control signals, wherein
after an j-th scan signal of the scan signals is supplied to pixels in an j-th row, an j-th emission control signal of the emission control signals is supplied to the pixels in the j-th row with an j-th interval between the j-th scan signal and the j-th emission control signal, and wherein
the j-th interval decreases by a constant time, as j increases by 1 (j is a natural number).

2. The organic light emitting display as claimed in claim 1 , wherein the second driving frequency is higher than the first driving frequency.

3. The organic light emitting display as claimed in claim 2 , wherein the first driving frequency is 120 Hz.

4. The organic light emitting display as claimed in claim 2 , wherein the second driving frequency is at least 240 Hz.

5. The organic light emitting display as claimed in claim 1 , wherein the scan driver is to supply the scan signals to the scan lines for one horizontal period.

6. The organic light emitting display as claimed in claim 5 , wherein the emission driver is to supply an emission control signal to a j-th emission control line to overlap a scan signal supplied to a scan line.

7. The organic light emitting display as claimed in claim 6 , wherein the emission driver is to supply an emission control signal to a (j+1)-th emission control line subsequent to the emission control signal being supplied to the j-th emission control line, and after a first period, the first period being shorter than a first horizontal period corresponding to the interval between adjacent scan signals.

8. The organic light emitting display as claimed in claim 1 , wherein the emission driver is to supply the emission control signals not to overlap emission time of the pixels of an i-th (i is a natural number) frame and emission time of the pixels of an (i+1)-th frame each other.

9. The organic light emitting display as claimed in claim 1 , further comprising a data driver to:
supply left data signals to the data lines in synchronization with scan signals supplied to the scan lines in an i-th frame (i is a natural number), and
supply right data signals to the data lines in synchronization with scan signals supplied to the scan lines in an (i+1)-th frame.

10. The organic light emitting display as claimed in claim 1 , wherein a width of each of the emission control signals is equal to or lesser than a half (½) of a frame.

11. The organic light emitting display as claimed in claim 1 , wherein each of the plurality of pixels comprises:
an organic light emitting diode (OLED);
a pixel circuit to charge a voltage corresponding to a data signal when a scan signal is supplied to a scan line,
the pixel circuit to control an amount of current supplied to the OLED to correspond to the charged voltage; and
a control transistor coupled between the OLED and the pixel circuit, wherein
the control transistor is turned off when an emission control signal is supplied to an emission control line, and
the control transistor is turned on in the other cases.

12. The organic light emitting display as claimed in claim 1 , wherein the slopes of the supply of the emission control signals have steeper slopes than slopes of the supply of the scan signals.

13. The organic light emitting display as claimed in claim 1 , each of the plurality of pixels includes a first transistor, a second transistor, and a storage capacitor, wherein
a first electrode of the first transistor is coupled to a data line, a second electrode of the first transistor is coupled to a gate electrode of the second transistor, and a gate electrode of the first transistor is coupled to a scan line.

14. The organic light emitting display as claimed in claim 13 , wherein the gate electrode of the second transistor is coupled to the second electrode of the first transistor.

15. The organic light emitting display as claimed in claim 1 , wherein
the constant time is the interval between the adjacent emission control signals.

16. A method of driving an organic light emitting display including a plurality of pixels positioned at intersections of scan lines, emission control lines, and data lines, the plurality of pixels arranged in at least three of rows and a plurality of columns, the method comprising:
sequentially supplying scan signals to the scan lines at a first driving frequency to select the pixels; and
sequentially supplying emission control signals to the emission control lines at a second driving frequency, different from the first driving frequency, to control emission of the pixels, wherein
the scan signals and the emission control signals are sequentially supplied by a frame, and a slopes of supply of the scan signals is re substantially different from a slopes of supply of the emission control signals, wherein
the slopes of supply of the scan signals are inversely proportional to an interval between adjacent scan signals, and the slopes of supply the emission control signals is inversely proportional to an interval between adjacent emission control signals, wherein
after an j-th scan signal of the scan signals is supplied to pixels in an j-th row, an j-th emission control signal of the emission control signals is supplied to the pixels in the j-th row with an j-th interval between the j-th scan signal and the j-th emission control signal, and wherein
the j-th interval decreases by a constant time, as j increases by 1 (j is a natural number).

17. The method as claimed in claim 16 , wherein the second driving frequency is higher than the first driving frequency.

18. The method as claimed in claim 17 , wherein the first driving frequency is 120 Hz.

19. The method as claimed in claim 17 , wherein the second driving frequency is at least 240 Hz.

20. The method as claimed in claim 16 , wherein an emission control signal is supplied to a j-th emission control line to overlap a scan signal supplied to a j-th scan line.

21. The method as claimed in claim 20 , wherein an emission control signal is supplied to a (j+1)-th emission control line subsequent to the emission control signal being supplied to the j-th emission control line, and after a period shorter than one horizontal period, the one horizontal period being a width of a scan signal.

22. The method as claimed in claim 16 , wherein each width of the emission control signals is set not to overlap emission time of the pixels of an i-th (i is a natural number) frame and emission time of the pixels of an (i+1)-th f

Assignees

• Kim Keum-Nam
• Choi Sang-Moo
• Chung Bo-Yong
• Nam Hui
• Samsung Display Co Ltd

Inventors

• Kim Keum-Nam
• Choi Sang-Moo
• Chung Bo-Yong
• Nam Hui

Classifications

• G09G2300/0842

  forming a memory circuit, e.g. a dynamic memory with one capacitor · CPC title

• G09G2300/0861

  with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes · CPC title

• G09G2320/0209

  Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display · CPC title

• G09G3/003 Primary

  to produce spatial visual effects · CPC title

• G09G3/3225 Primary

  using an active matrix · CPC title