Organic light emitting display

• US 20060262130A1
• Filed: 03/27/2006
• Published: 11/23/2006
• Est. Priority Date: 04/28/2005
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Mobile Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Kim, Yang Wan, Oh, Choon Yul
• Granted Patent: US 7,855,700 B2
• Time in Patent Office: Days
• US Class Current: 345/589
• CPC Class Codes: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2300/0861 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 Class Codes: G09G 2310/0251 Precharge or discharge of pixel before applying new pixel voltage
• CPC Class Codes: G09G 2310/0297 Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns
• CPC Class Codes: G09G 2320/0223 Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3291 in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements

Abstract

Disclosed is an organic light emitting display that reduces the number of output lines and adjusts a white balance. A scan driver supplies scan signals to a plurality of scan lines. A data driver supplies data signals to a plurality of output lines. Demultiplexers are installed at the respective output lines, and supply the data signals to the plurality of data lines. Data capacitors are coupled with the data lines, and charge a voltage corresponding to the data signals. An image display device is coupled with the scan lines and the data lines, and includes red pixels having a red organic light emitting diode, green pixels having a green organic light emitting diode, and blue pixels having a blue organic light emitting diode. A first initialization power supply supplies a first voltage to the red pixels. A second initialization power supply supplies a second voltage to the green pixels. A third initialization power supply supplies a third voltage to the blue pixels. Voltages of the first, second, and third initialization power supplies are differently set, respectively.

Claims

1. An organic light emitting display comprising:

a scan driver connected to a plurality of scan lines;

a data driver connected to a plurality of first data lines;

a plurality of sets of second data lines;

a plurality of demultiplexers, each of the demultiplexers being connected at its input to a respective one of the first data lines and at its outputs to a respective one set of the second data lines;

an image display device connected to the scan lines and the second data lines, the image display device having a plurality of pixels, the plurality of pixels comprising red pixels, green pixels, and blue pixels;

an initialization power supply connected to the image display device, the initialization power supply comprising;

a first initialization power supply connected to the red pixels;

a second initialization power supply connected to the green pixels; and

a third initialization power supply connected to the blue pixels,

wherein the voltages supplied by the first, second, and third initialization power supplies are different from one another; and

a plurality of data capacitors, each of the data capacitors being coupled with a respective one of the second data lines.

2. The organic light emitting display of claim 1, wherein the voltage of the first initialization power supply is lower than that of the second initialization power supply.

3. The organic light emitting display of claim 2, wherein the voltage of the first initialization power supply is higher than that of the third initialization power supply.

4. The organic light emitting display of claim 1, wherein each of the pixels comprises:

an organic light emitting diode;

a second transistor coupled between one of the second data lines and one of the scan lines;

a storage capacitor for charging a voltage corresponding to a data signal supplied from the one of the second data lines;

a first transistor for supplying an electric current corresponding to the voltage charged in the storage capacitor to the organic light emitting diode;

a third transistor for causing the first transistor to be diode-connected; and

a fourth transistor coupled with the initialization power supply.

5. The organic light emitting display of claim 4, further comprising at least one fifth transistor coupled with a light emitting control line for controlling a supply time of an electric current flowing from the first transistor to the organic light emitting diode.

6. The organic light emitting display of claim 1, wherein the scan driver supplies a scan signal during a first period that is a part of one horizontal period.

7. The organic light emitting display of claim 6, wherein the data driver supplies a plurality of data signals to the first data line during a second period which does not overlap with the first period of the one horizontal period.

8. The organic light emitting display of claim 7, wherein the demultiplexer comprises a plurality of transistors, each of the transistors being coupled with a respective one of the second data lines.

9. The organic light emitting display of claim 8, wherein the plurality of transistors are sequentially turned-on during the second period to supply the data signal to the data capacitors.

10. The organic light emitting display of claim 9, wherein the voltage stored in the data capacitors is supplied to the red, green, and blue pixels during the first period.

11. An organic light emitting display comprising:

means for providing scan signals to a plurality of scan lines;

means for providing data signals to a plurality of first data lines;

a plurality of sets of second data lines;

a plurality of means for receiving a data signal from a respective one of the first data lines and outputting data signals to a respective one set of the second data lines;

means for displaying an image according to the scan signals from the scan lines and the data signals from the second data lines; and

means for supplying power to the means for displaying,

wherein the means for displaying comprises pixels of different colors, and wherein the pixels of different colors are provided with initialization power supplies of different voltage levels.