ORGANIC LIGHT-EMITTING DISPLAY DEVICE

• US 20130083001A1
• Filed: 10/04/2012
• Published: 04/04/2013
• Est. Priority Date: 10/04/2011
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: JEONG, Ui Taek
• Granted Patent: US 9,349,315 B2
• Time in Patent Office: Days
• US Class Current: 345/212
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/0814 used for selection purposes, e.g. logical AND for partial update
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• 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 3/30 using electroluminescent panels
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3266 Details of drivers for scan electrodes

Abstract

An organic light-emitting display device includes: an organic light-emitting panel defined into a plurality of pixel regions which each includes a drive transistor configured to drive an organic light emission element and a load capacitor configured to charge a threshold voltage of the drive transistor; and a controller configured to calculate an offset information on the basis of the threshold voltage and derive a second image signal by reflecting the offset information to a first image signal.

Claims

1. An organic light-emitting display device comprising:

an organic light-emitting panel defined into a plurality of pixel regions, the pixel region including a drive transistor configured to drive an organic light emission element and a load capacitor configured to charge a threshold voltage of the drive transistor; and

a controller configured to calculate offset information on the basis of the threshold voltage and derive a second image signal by reflecting the offset information to a first image signal.

2. The organic light-emitting display device of claim 1, wherein

the load capacitor charges a first voltage in a first sensing interval and a second voltage in a second sensing interval, and

the controller obtains the gain information from the first and second voltages and reflects the gain information to the first image signal.

3. The organic light-emitting display device of claim 2, further comprising:

a scan driver configured to apply scan signals to the organic light-emitting panel; and

a data driver configured to apply one of a pre-charge data voltages and data voltages to the organic light-emitting panel,

wherein the pre-charge data voltage is used for detecting the threshold voltage.

4. The organic light-emitting display device of claim 3, wherein the data driver includes:

a DAC configured to convert a pre-charge data signal and the second image signal, which each corresponds to digital signals, into one of the pre-charge data voltage and the data voltage which each corresponds to analog signals;

a ADC configured to convert a first sensing information including the threshold voltage and the first and second voltages, which each corresponds to the analog signals, into a second sensing information corresponding the digital signal; and

a selector configured to selectively connect the data lines on the organic light-emitting panel to one of the DAC and the ADC.

5. The organic light-emitting display device of claim 4, wherein the controller includes:

an offset adjuster configured to calculate offset information on the basis of the threshold voltage and store the offset information; and

a data adjuster configured to generate the second image signal by reflecting the offset information to the first image signal.

6. The organic light-emitting display device of claim 5, wherein the offset adjuster is configured to include an offset LUT into which the offset information in accordance with a plurality of threshold voltages is stored in a table, and obtain the offset information corresponding to the threshold voltage from the offset LUT.

7. The organic light-emitting display device of claim 5, wherein the controller further includes:

a gain adjuster configured to calculate a slope on the basis of the first and second voltages, obtain gain information from the calculated slope, and store the gain information,

wherein the data adjuster reflects the gain information to the first image signal.

8. The organic light-emitting display device of claim 7, wherein the slope is derived from the first and second voltages in a mobility detection interval, which is defined by a difference between the first and second sensing intervals.

9. The organic light-emitting display device of claim 4, wherein

the pre-charge data voltage is charged into the load capacitor within the pixel region for a first interval,

the threshold voltage of the drive transistor is detected for a second interval by enabling the drive transistor responding to the pre-charge data voltage to be driven, and

the data driver receives the detected threshold voltage through the data line for a third interval.