Organic light emitting display and method for driving the same

Patent metadata

Field	Value
Publication number	US-10170054-B2
Application number	US-201514691039-A
Country	US
Kind code	B2
Filing date	Apr 20, 2015
Priority date	Nov 26, 2014
Publication date	Jan 1, 2019
Grant date	Jan 1, 2019

Abstract

An organic light emitting display that defines a plurality of pixels arranged in a matrix form as a plurality of pixel row groups, each of which includes the same number of pixel rows and individually drives the respective pixel row groups. The organic light emitting display includes a display unit including the plurality of pixels, a plurality of data lines, and a plurality of scan lines: a scan driving unit configured to apply scan signals to the plurality of pixels; a data driving unit configured to apply data voltages that are provided to the plurality of pixels to a first output line; and a data distribution unit configured to selectively connect at least two data lines that are continuously arranged to the first output line according to demultiplexing signals. The demultiplexing signals that correspond to the pixel rows included in the respective pixel row groups have different pulse widths.

First claim

What is claimed is:

1. An organic light emitting display that defines a plurality of pixels arranged in a matrix as a plurality of pixel row groups, each of which comprises the same number of pixel rows and individually drives the respective pixel row groups, the organic light emitting display comprising:
a display unit comprising the plurality of pixels, a plurality of data lines, and a plurality of scan lines;
a scan driving unit configured to apply scan signals to the plurality of pixels;
a data driving unit configured to apply data voltages, that are to be provided to the plurality of pixels, to a first output line; and
a data distribution unit including a plurality of demultiplexers, each demultiplexer comprising two switches configured to selectively connect at least two data lines that are continuously arranged to the first output line according to at least two demultiplexing signals, each switch controlling connection between its respective data line and the first output line in response to receiving one of said demultiplexing signals,
wherein;
the demultiplexing signals that correspond to the pixel rows included in the respective row groups have different pulse widths, a first pulse width of each of the demultiplexing signals that corresponds to a first pixel row of the pixel row group is greater than a last pulse width of each of the demultiplexing signals that corresponds to a last pixel row of the pixel row group; and
the demultiplexing signals are sequentially output corresponding to the scan signals that are sequentially output.

2. The organic light emitting display of claim 1 , wherein the pulse widths of the demultiplexing signals are sequentially decreased.

3. The organic light emitting display of claim 1 , wherein one of the pulse widths of each of the demultiplexing signals that corresponds to at least one of the pixel rows between the first pixel row and the last pixel row is less than the first pulse width of each of the demultiplexing signals that corresponds to the first pixel row and is greater than the last pulse width of each of the demultiplexing signals that corresponds to the last pixel row.

4. A method for driving an organic light emitting display that includes a plurality of demultiplexers, a plurality of pixels, a plurality of data lines, and a plurality of scan lines, and defines the plurality of pixels as a plurality of pixel row groups, each of which includes the same number of pixel rows and individually drives the respective pixel row groups, the method comprising:
applying a reference voltage to the respective pixel row groups;
providing scan signals to the respective pixel row groups;
inputting data voltages, that are to be provided to the respective pixel row groups in correspondence to the scan signals, to a first output line;
making the respective pixel row groups emit light based on the inputted data voltages; and
selectively connecting at least two data lines that are continuously arranged to the first output line according to at least two demultiplexing signals, wherein each demultiplexed signal is applied to one of two switches that comprise a single demultiplexer, each switch controlling connection between its respective data line and said first output line, wherein;
the demultiplexing signals that correspond to the pixel rows included in the respective row groups have different pulse widths, a first pulse width of each of the demultiplexing signals that corresponds to a first pixel row of the pixel row group is greater than a last pulse width of each of the demultiplexing signals that corresponds to a last pixel row of the pixel row group; and
the demultiplexing signals are sequentially output corresponding to the scan signals that are sequentially output.

5. The method of claim 4 , wherein the pulse widths of the demultiplexing signals are sequentially decreased.

6. The method of claim 4 , further comprising applying an initialization voltage to the respective pixel row groups before the reference voltage is applied.

7. The method of claim 4 , wherein the reference voltage is simultaneously applied to the pixel rows included in the respective pixel row groups.

8. The method of claim 4 , wherein the respective pixel row groups are sequentially driven.

Assignees

• Samsung Display Co Ltd

Inventors

• Park Sang Hun
• Park Dong Wan
• Song Myoung Seop

Classifications

• G09G2320/043

  Preventing or counteracting the effects of ageing · CPC title

• G09G2310/08

  Details of timing specific for flat panels, other than clock recovery · CPC title

• G09G2310/0297

  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 title

• G09G2310/0218

  with collection of electrodes in groups for n-dimensional addressing · CPC title

• G09G2310/021

  Double addressing, i.e. scanning two or more lines, e.g. lines 2 and 3; 4 and 5, at a time in a first field, followed by scanning two or more lines in another combination, e.g. lines 1 and 2; 3 and 4, in a second field · CPC title