Display apparatus

Patent metadata

Field	Value
Publication number	US-2020074908-A1
Application number	US-201916559244-A
Country	US
Kind code	A1
Filing date	Sep 3, 2019
Priority date	Sep 4, 2018
Publication date	Mar 5, 2020
Grant date	—

Abstract

A display apparatus is disclosed, which is capable of reducing the number of output channels in a column driving circuit. The display apparatus comprises a display portion including pixels arranged in pixel areas defined by row line groups and column line groups, a row driving circuit configured to supply a scan control signal to the row line groups, a column driving circuit configured to sequentially output a data signal every horizontal period, and a data distribution circuit configured to sequentially supply the data signal, which is sequentially output from each of output channels of the column driving circuit, to the column line groups in accordance with a data selection signal, wherein a period of the data selection signal is longer than 1 horizontal period.

First claim

What is claimed is:

1 . A display apparatus comprising:
a display portion including pixels in pixel areas defined by row line groups and column line groups; a row driving circuit configured to supply a scan control signal to the row line groups; a column driving circuit configured to sequentially output a data signal every horizontal period; and a data distribution circuit configured to sequentially supply the data signal, which is sequentially output from each of output channels of the column driving circuit, to the column line groups in accordance with a data selection signal, wherein a period of the data selection signal is longer than one (1) horizontal period.

2 . The display apparatus according to claim 1 , wherein a period of the data selection signal corresponds to two (2) horizontal periods.

3 . The display apparatus according to claim 2 ,
wherein the column driving circuit sequentially outputs a first data signal and a second data signal to be supplied to the pixels for displaying different colors every horizontal period, and the second data signal of the (i)th horizontal period and the first data signal of the (i+1)th horizontal period are sequentially supplied to the pixels disposed in the different horizontal lines and configured to display the same color, where ‘i’ is a natural number.

4 . The display apparatus according to claim 3 , wherein the data distribution circuit includes a plurality of demultiplex circuits configured to sequentially supply the first data signal and the second data signal, which are sequentially provided from the output channels of the column driving circuit, to the two column line groups.

5 . A display apparatus comprising:
a display portion including pixels arranged in pixel areas defined by row line groups and column line groups; a row driving circuit configured to supply a scan control signal to the row line groups; a column driving circuit configured to sequentially output a first data signal and a second data signal to the pixels configured to display different color every horizontal period; and a data distribution circuit configured to sequentially supply the first data signal and the second data signal, which are sequentially output from each of output channels of the column driving circuit, to the two column line groups, wherein the second data signal of the (i)th horizontal period and the first data signal of the (i+1)th horizontal period are sequentially supplied to the pixels disposed in the different horizontal lines and configured to display the same color, where ‘i’ is a natural number, and the data distribution circuit continuously supplies the second data signal of the (i)th horizontal period and the first data signal of the (i+1)th horizontal period to any one of the two column line groups.

6 . The display apparatus according to claim 5 , wherein a period of the data selection signal is longer than one (1) horizontal period.

7 . The display apparatus according to claim 6 , wherein the data distribution circuit includes a plurality of demultiplex circuits configured to sequentially supply the first data signal and the second data signal, which are sequentially provided from the output channels of the column driving circuit, to the two column line groups in accordance with the data selection signal.

8 . The display apparatus according to claim 7 ,
wherein the horizontal period includes a first time-division period, and a second time-division period which is longer than the first time-division period, and the column driving circuit outputs the first data signal in the first time-division period, and outputs the second data signal in the second time-division period.

9 . The display apparatus according to claim 8 , wherein the scan control signal is supplied in the second time-division period.

10 . The display apparatus according to claim 7 ,
wherein the data selection signal includes the first data selection signal, and the second data selection signal which is different from the first data selection signal, and each of the plurality of demultiplex circuits includes: an input line connected with the corresponding output channel among the output channels of the column driving circuit; first and second output lines connected with the two column line groups in a one-to-one correspondence; a first switch which is turned-on by the first data selection signal of the data selection signal, and outputs the first data signal, which is supplied through the input line, to the first output line; and a second switch which is turned-on by the second data selection signal of the data selection signal, and outputs the second data signal, which is supplied through the input line, to the second output line.

11 . The display apparatus according to claim 10 ,
wherein each of the first data selection signal and the second data selection signal includes a switch-on period configured to maintain a switch-on voltage level, and a switch-off period configured to maintain a switch-off voltage level, the scan control signal includes a transistor-on period configured to maintain a transistor-on voltage level, and a transistor-off period configured to maintain a transistor-off voltage level, and the transistor-on period of the scan control signal is shorter than the switch-on period in each of the first data selection signal and the second data selection signal.

12 . The display apparatus according to claim 11 , wherein the transistor-on period of the scan control signal is overlapped with the switch-off period of the first data selection signal and the switch-on period of the second data selection signal.

13 . The display apparatus according to claim 11 ,
wherein each of the first data selection signal and the second data selection signal includes a first transition start point at which a transition from the switch-on voltage level to the switch-off voltage level is started, and a second transition start point at which a transition from the switch-off voltage level to the switch-on voltage level is started, the second transition start point of the first data selection signal is overlapped with the switch-off period of the second data selection signal, and the second transition start point of the second data selection signal is overlapped with the switch-off period of the first data selection signal.

14 . The display apparatus according to claim 11 ,
wherein each of the first data selection signal and the second data selection signal includes a first transition start point at which a transition from the switch-on voltage level to the switch-off voltage level is started, and a second transition start point at which a transition from the switch-off voltage level to the switch-on voltage level is started, the scan control signal includes a first transition start point at which a transition from the transistor-off voltage level to the transistor-on voltage level is started, and a second transition start point at which a transition from the transistor-on voltage level to the transistor-off voltage level is started, and the first transition start point of the scan control signal has a predetermined time difference from the second transition start point of the first data selection signal or the second transition start point of the second data selection signal.

15 . The display apparatus according to claim 14 , wherein the first transition start point of the scan control signal is delayed from the second transition start point of the first data selection signal, or a start point after a second transition completion point of the second d

Assignees

• Lg Display Co Ltd

Inventors

• Kang Gyutae

Classifications

• G09G3/3283

  in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements · CPC title

• G09G2300/0452

  Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components · CPC title

• G09G2310/08

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

• G09G2300/0426

  Layout of electrodes and connections · CPC title

• G09G3/3233 Primary

  with pixel circuitry controlling the current through the light-emitting element · CPC title