Organic light emitting display, method for driving the same, and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-9779663-B2
Application number	US-201514864659-A
Country	US
Kind code	B2
Filing date	Sep 24, 2015
Priority date	Sep 26, 2012
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

An organic light emitting display, a method for driving the same, and a method for manufacturing the same are discussed. The organic light emitting display according to an embodiment includes a panel including subpixels each having a compensation circuit including a reference voltage supply transistor, which receives a reference voltage and initializes a node of a gate electrode or a drain electrode of a driving transistor using the reference voltage, a scan driver supplying a scan signal to scan lines of the panel, a data driver supplying a data signal to data lines of the panel, a timing controller that controls the scan driver and the data driver, and a reference voltage compensation unit supplying the reference voltage including a reverse voltage opposite a ripple generated in the reference voltage to the subpixels and cancel the ripple.

First claim

What is claimed is:

1. An organic light emitting display comprising:
a panel including subpixels each having a compensation circuit including a reference voltage supply transistor, which receives a reference voltage and initializes a node of a gate electrode or a drain electrode of a driving transistor using the reference voltage;
a scan driver configured to supply a scan signal to scan lines of the panel;
a data driver configured to supply a scan signal to data lines of the panel;
a timing controller configured to control the scan driver and the data driver; and
a reference voltage compensator configured to supply the reference voltage including a reverse voltage opposite a ripple generated in the reference voltage to the subpixels and cancel the ripple,
wherein the reference voltage compensator outputs the reference voltage including the reverse voltage based on a voltage level output from a digital-to-analog converter included in the data driver.

2. The organic light emitting display of claim 1 , wherein the timing controller includes:
a difference value calculator configured to compare an (n−1)th data signal with an nth data signal and obtain a difference value between them; and
a gain adjuster configured to output a voltage change signal, which is adjusted so that the reverse voltage is included in the reference voltage, based on the difference value.

3. The organic light emitting display of claim 2 , wherein the gain adjuster adds the difference values and then multiplies a sum of the difference values by a gain value to produce the voltage change signal,
wherein the gain value is a data value calculated for measuring and canceling the ripple appearing in the panel.

4. The organic light emitting display of claim 1 , wherein the reverse voltage includes first to ith positive reverse voltages, first to ith negative reverse voltages, or both, where ‘i’ is an integer equal to or greater than 2.

5. A method for driving an organic light emitting display comprising:
measuring a panel and dating a gain value for cancelling a ripple generated in a reference voltage;
supplying the reference voltage including a reverse voltage opposite the ripple generated in the reference voltage using the gain value to subpixels included in the panel to cancel the ripple;
supplying a scan signal to the subpixels included in the panel; and
supplying a data signal to the subpixels included in the panel,
wherein the reverse voltage includes first to ith positive reverse voltages, first to ith negative reverse voltages, or both, where is an integer equal to or greater than 2.

Assignees

• Lg Display Co Ltd

Inventors

• Kim Jihun
• Yu Sangho
• Nam Woojin
• Yoon Joongsun
• Chang Minkyu

Classifications

• G09G2320/045

  Compensation of drifts in the characteristics of light emitting or modulating elements · 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

• G09G2300/0852

  being a dynamic memory with more than one capacitor · 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

• G09G2300/0842

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