Organic Light Emitting Display Device

• US 20150170565A1
• Filed: 12/10/2014
• Published: 06/18/2015
• Est. Priority Date: 12/13/2013
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Ryu, Ho Jin, Hong, Sang Pyo
• Granted Patent: US 9,646,533 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2310/067 Special waveforms for scanning, where no circuit details of the gate driver are given
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2320/0295 by monitoring each display pixel
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 3/3225 using an active matrix
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element

Abstract

An organic light emitting display device that increases an aperture ratio is provided. The organic light emitting display device comprises a display panel that includes a plurality of sub pixels provided in a pixel region defined by a plurality of scan control lines and a plurality of data lines, each scan control line crossing each data line, wherein some of the plurality of sub pixels have a first aperture ratio, and the other sub pixels have a second aperture ratio smaller than the first aperture ratio.

Claims

1. An organic light emitting display device comprising a display panel that includes a plurality of sub pixels provided in a pixel region defined by a plurality of scan control lines and a plurality of data lines, each scan control line crossing each data line,

wherein some of the plurality of sub pixels have a first aperture ratio, and the other sub pixels have a second aperture ratio smaller than the first aperture ratio.

2. The organic light emitting display device of claim 1, wherein each of the plurality of sub pixels includes:

an organic light emitting device emitting light through a current; and

a pixel circuit having at least two transistors and at least one capacitor, controlling the current flowing in the organic light emitting device on the basis of a scan pulse supplied to the scan control line and a data voltage supplied to the data line, and

the pixel circuit of the sub pixels having the first aperture ratio includes transistors different from the number of transistors included in the pixel circuit of the sub pixels having the second aperture ratio.

3. The organic light emitting display device of claim 1, wherein at least three sub pixels adjacent to one another constitute one unit pixel, and

any one of the sub pixels constituting the unit pixel has the second aperture ratio and the other sub pixels have the first aperture ratio.

4. The organic light emitting display device of claim 3, wherein the display panel further includes a plurality of sensing control lines and a plurality of reference lines,

the sub pixels having the second aperture ratio are connected to the scan control line and the data line, and

the sub pixels having the first aperture ratio are connected to the scan control line, the sensing control line, the reference line and the data line.

5. The organic light emitting display device of claim 4, wherein the sub pixel having the first aperture ratio includes:

a first organic light emitting device emitting light through a current;

a switching transistor outputting the data voltage supplied to the data line in accordance with the scan pulse supplied to the scan control line;

a first driving transistor controlling the current flowing in the first organic light emitting device in accordance with the data voltage output from the switching transistor; and

a capacitor connected between source-gate electrodes of the first driving transistor, storing the data voltage.

6. The organic light emitting display device of claim 5, wherein the sub pixel having the second aperture ratio includes:

a second organic light emitting device emitting light through a current;

a first switching transistor outputting the data voltage supplied to the data line in accordance with the scan pulse supplied to the scan control line;

a second driving transistor controlling the current flowing in the second organic light emitting device in accordance with the data voltage output from the first switching transistor;

a capacitor connected between source-gate electrodes of the second driving transistor, storing the data voltage; and

a second switching transistor supplying a voltage supplied to the reference line to an anode electrode of the second organic light emitting device in accordance with the scan pulse of the sensing control line.

7. The organic light emitting display device of claim 6, further comprising a panel driver for displaying an image in each sub pixel of the display panel, and

wherein the panel driver sets the sub pixels having the second aperture ratio to sensing sub pixels and sets the sub pixels having the first aperture ratio to non-sensing sub pixels, generates sensing data by sensing characteristic variation of the second driving transistor included in the sensing sub pixels through each of the plurality of reference lines, and displays input data of each sub pixel in the corresponding sub pixel by correcting the input data on the basis of the sensing data of the sensing sub pixels.

8. The organic light emitting display device of claim 7, wherein the panel driver includes a timing controller correcting the input data of each sub pixel on the basis of the sensing data of the sensing sub pixels, and

wherein the timing controller generates compensation data of the sensing sub pixels, which are intended to compensate for characteristic variation of the second driving transistor included in the sensing sub pixels on the basis of the sensing data of the sensing sub pixels, generates compensation data of the non-sensing sub pixels, which are intended to compensate for characteristic variation of the first driving transistor included in the non-sensing sub pixels of each unit pixel through interpolation based on the compensation data of the sensing sub pixel, and corrects input data of the corresponding sub pixels on the basis of the compensation data of each of the sensing sub pixels and the non-sensing sub pixels.

9. The organic light emitting display device of claim 6, wherein the second switching transistors of the sub pixels having the second aperture ratio, which are set in two unit pixels adjacent to each other in an up and down direction, share one sensing control line.

10. The organic light emitting display device of claim 9, further comprising a panel driver for displaying an image in each sub pixel of the display panel, and

wherein the panel driver sets the sub pixels having the second aperture ratio to sensing sub pixels and sets the sub pixels having the first aperture ratio to non-sensing sub pixels, generates sensing data by sensing characteristic variation of the second driving transistor included in the sensing sub pixels through each of the plurality of reference lines, and displays input data of each sub pixel in the corresponding sub pixel by correcting the input data on the basis of the sensing data of the sensing sub pixels.

11. The organic light emitting display device of claim 10, wherein the panel driver includes a timing controller correcting the input data of each sub pixel on the basis of the sensing data of the sensing sub pixels, and

wherein the timing controller generates compensation data of the sensing sub pixels, which are intended to compensate for characteristic variation of the second driving transistor included in the sensing sub pixels on the basis of the sensing data of the sensing sub pixels, generates compensation data of the non-sensing sub pixels, which are intended to compensate for characteristic variation of the first driving transistor included in the non-sensing sub pixels of each unit pixel through interpolation based on the compensation data of the sensing sub pixel, and corrects input data of the corresponding sub pixels on the basis of the compensation data of each of the sensing sub pixels and the non-sensing sub pixels.

12. The organic light emitting display device of claim 6, wherein the sub pixels having the second aperture ratio are set as sub pixels of different colors per unit pixels adjacent to each other in an up and down direction.

13. The organic light emitting display device of claim 12, further comprising a panel driver for displaying an image in each sub pixel of the display panel, and

wherein the panel driver sets the sub pixels having the second aperture ratio to sensing sub pixels and sets the sub pixels having the first aperture ratio to non-sensing sub pixels, generates sensing data by sensing characteristic variation of the second driving transistor included in the sensing sub pixels through each of the plurality of reference lines, and displays input data of each sub pixel in the corresponding sub pixel by correcting the input data on the basis of the sensing data of the sensing sub pixels.

14. The organic light emitting display device of claim 13, wherein the panel driver includes a timing controller correcting the input data of each sub pixel on the basis of the sensing data of the sensing sub pixels, and

wherein the timing controller generates compensation data of the sensing sub pixels, which are intended to compensate for characteristic variation of the second driving transistor included in the sensing sub pixels on the basis of the sensing data of the sensing sub pixels, generates compensation data of the non-sensing sub pixels, which are intended to compensate for characteristic variation of the first driving transistor included in the non-sensing sub pixels of each unit pixel through interpolation based on the compensation data of the sensing sub pixel, and corrects input data of the corresponding sub pixels on the basis of the compensation data of each of the sensing sub pixels and the non-sensing sub pixels.