# US 2014/0152643 A1 · Organic light emitting display

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- Number: US 2014/0152643 A1
- Document ID: US20140152643A1
- Status: Published application
- Kind: A1
- Application number: 14/095,564
- Filed: 2013-12-03
- Published: 2014-06-05
- Earliest claimed: 2012-12-04
- Assignees: LG Display Co., Ltd.
- Applicants: LG Display Co., Ltd.
- Inventors: Sunghoon KIM; Dongwon PARK; Younghwan AHN; Yunki WON
- Web page: https://patentgrep.com/patent/US20140152643A1

## CPC

- G09G 3/3258: with pixel circuitry controlling the voltage across the light-emitting element
- G09G 2330/06: Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## Abstract

Provided is an organic light emitting display including a display panel, a data driver supplying a data signal to the display panel, a timing controller controlling the data driver, a power source supply unit converting an external voltage and outputting a high potential voltage and a low potential voltage through a first power source line and a second power source line, a measurement unit measuring a current or a voltage flowing through the first power source line and the second power source line and outputting a measured value, and a compensation coefficient calculator matching the measured value and a reference value stored in the compensation coefficient calculator to a driving signal and comparing the measured value and the reference value to judge a degree of noise and calculating a compensation coefficient.

## Claims

### Claim 1

An organic light emitting display comprising:
a display panel;
a data driver supplying a data signal to the display panel;
a timing controller controlling the data driver;
a power source supply unit converting an external voltage supplied from an outside and outputting a high potential voltage and a low potential voltage through a first power source line and a second power source line;
a measurement unit measuring a current or a voltage flowing through the first power source line and the second power source line and outputting a measured value; and
a compensation coefficient calculator matching the measured value and a reference value stored in the compensation coefficient calculator to a driving signal supplied from the timing controller and comparing the measured value and the reference value to judge a degree of noise occurring at an output end of the power source supply unit, and calculating a compensation coefficient according to the degree of noise.

### Claim 2 (depends on 1)

The organic light emitting display of claim 1, wherein the compensation coefficient calculator matches the driving signal to the measured value and the reference value and compares the measured value and the reference value to generate the compensation coefficient so as to include information about a degree of compensation performed when a predetermined data signal is supplied during a predetermined frame period.

### Claim 3 (depends on 2)

The organic light emitting display of claim 2, wherein the compensation coefficient calculator judges whether a differential value between the reference value and the measured value is a positive value or a negative value through a simple calculation process where the measured value is subtracted from the reference value.

### Claim 4 (depends on 3)

The organic light emitting display of claim 3, wherein the compensation coefficient calculator supplies the compensation coefficient to the timing controller, and the timing controller reduces a grayscale of the data signal when the compensation coefficient corresponds to the positive value and increases the grayscale of the data signal when the compensation coefficient corresponds to the negative value.

### Claim 5 (depends on 1)

The organic light emitting display of claim 1, wherein the driving signal includes a vertical synchronization signal determining starting of a vertical position of an image displayed on the display panel and a source output enable signal allowing the data signal to be outputted.

### Claim 6

An organic light emitting display comprising:
a display panel;
a data driver supplying a data signal to the display panel;
a gamma unit supplying a gamma reference voltage to the data driver;
a timing controller controlling the data driver;
a power source supply unit converting an external voltage supplied from an outside and outputting a high potential voltage and a low potential voltage through a first power source line and a second power source line;
a measurement unit measuring a current or a voltage flowing through the first power source line and the second power source line and outputting a measured value; and
a compensation coefficient calculator matching the measured value and a reference value stored in the compensation coefficient calculator to a driving signal supplied from the timing controller and comparing the measured value and the reference value to judge a degree of noise occurring at an output end of the power source supply unit, and calculating first and second compensation coefficients used to distinguishably correct the data signal and the gamma reference voltage according to the degree of noise.

### Claim 7 (depends on 6)

The organic light emitting display of claim 6, wherein the compensation coefficient calculator matches the driving signal to the measured value and the reference value and compares the measured value and the reference value to distinguishably generate the first and second compensation coefficients to include information about a degree of compensation performed when a predetermined data signal is supplied during a predetermined frame period.

### Claim 8 (depends on 7)

The organic light emitting display of claim 7, wherein the compensation coefficient calculator judges whether a differential value between the reference value and the measured value is a positive value or a negative value through a simple calculation process where the measured value is subtracted from the reference value.

### Claim 9 (depends on 8)

The organic light emitting display of claim 8, wherein the compensation coefficient calculator supplies the first compensation coefficient to the timing controller and supplies the second compensation coefficient to the gamma unit,
the timing controller reduces a grayscale of the data signal when the first compensation coefficient corresponds to the positive value and increases the grayscale of the data signal when the first compensation coefficient corresponds to the negative value, and
the gamma unit reduces the gamma reference voltage when the second compensation coefficient corresponds to the positive value and increases the gamma reference voltage when the second compensation coefficient corresponds to the negative value.

### Claim 10 (depends on 6)

The organic light emitting display of claim 6, wherein the driving signal includes a vertical synchronization signal determining starting of a vertical position of an image displayed on the display panel and a source output enable signal allowing the data signal to be outputted.