Display device and method of inspecting the same

Patent metadata

Field	Value
Publication number	US-2016372017-A1
Application number	US-201615063797-A
Country	US
Kind code	A1
Filing date	Mar 8, 2016
Priority date	Jun 16, 2015
Publication date	Dec 22, 2016
Grant date	—

Abstract

A display device according to one or more embodiments of the present disclosure includes a plurality of pixels located at crossing regions of a plurality of scan lines and a plurality of data lines; a data driver coupled to ends of the plurality of data lines at a first side and configured to supply a plurality of data signals to the plurality of data lines; an inspection unit coupled to ends of the plurality of data lines at a second side and configured to supply a plurality of inspection signals to the plurality of pixels; at least one detection line electrically coupled to the inspection unit and extending from a first side of the panel to a second side of the panel; and a reset transistor coupled between the detection line and a reset power supply and configured to turn on when it receives a first control signal.

First claim

What is claimed is:

1 . A display device comprising:
a plurality of pixels located at crossing regions of a plurality of scan lines and a plurality of data lines; a data driver coupled to ends of the plurality of data lines at a first side and configured to supply a plurality of data signals to the plurality of data lines; an inspection unit coupled to ends of the plurality of data lines at a second side and configured to supply a plurality of inspection signals to the plurality of pixels; at least one detection line electrically coupled to the inspection unit and extending from a first side of a panel to a second side of the panel; and a reset transistor coupled between the detection line and a reset power supply and configured to turn on in response to a first control signal.

2 . The display device according to claim 1 , wherein a voltage of the reset power supply is lower than that of the data signals supplied from the data driver.

3 . The display device according to claim 2 , wherein the voltage of the reset power supply is lower than that of a data signal of white.

4 . The display device according to claim 1 , further comprising a scan driver configured to supply a plurality of scan signals to the plurality of scan lines.

5 . The display device according to claim 4 , wherein the plurality of pixels comprises:
a first pixel configured to display a first color; a second pixel configured to display a second color; and a third pixel configured to display a third color.

6 . The display device according to claim 5 , wherein the first color is red, the second color is blue, and the third color is green.

7 . The display device according to claim 4 , wherein the inspection unit comprises:
a first control transistor coupled between ends of a first side of the detection lines and a specific data line coupled to the third pixel, the first control transistor being configured to turn on in response to a second control signal; and a second control transistor coupled between ends of a second side of the detection lines and a third inspection line that is configured to supply an inspection signal to the third pixel, the second control transistor being configured to turn on in response to the second control signal.

8 . The display device according to claim 7 , wherein the first control signal does not overlap with the second control signal.

9 . The display device according to claim 7 , wherein the data driver is configured to supply a data signal of white when the first control signal is supplied during a first period of inspection, and
wherein a voltage corresponding to a data signal of black is supplied to the third inspection line and the scan driver sequentially supplies the plurality of scan signals to the plurality of scan lines when the second control signal is supplied during a second period of inspection.

10 . The display device according to claim 9 , further comprising a demultiplexer unit coupled between the data driver and the plurality of data lines.

11 . The display device according to claim 10 , wherein the demultiplexer unit comprises:
first switching elements coupled to respective ones of the data lines that are coupled to the first pixels; second switching elements coupled to respective ones of the data lines that are coupled to the second pixels; and third switching elements coupled to respective ones of the data lines that are coupled to the third pixels, and wherein the third switching elements are turned on during the first period.

12 . The display device according to claim 7 , wherein the inspection unit comprises:
first transistors coupled between respective ones of the data lines that are coupled to the first pixels and a first inspection line, and that turn on in response to the second control signal; second transistors coupled between respective ones of the data lines that are coupled to the second pixels and a second inspection line, and that turn on in response to the second control signal; and third transistors coupled between respective ones of the data lines that are coupled to the third pixels, other than the specific data lines and a third inspection line, and that turn on in response to the second control signal.

13 . The display device according to claim 12 , wherein the third transistors are dual gate transistors.

14 . The display device according to claim 12 , wherein at least one of the first transistors and the second transistors are dual gate transistors.

15 . A method of inspecting a display device comprising an inspection unit configured to supply a plurality of inspection signals to a plurality of pixels, and at least one detection line having first and second ends that are electrically coupled to the inspection unit, the method comprising:
turning off a first control transistor between the first end of the at least one detection line and a specific data line, and turning off a second control transistor between the second end of the at least one detection line and an inspection line; turning on a reset transistor coupled between the at least one detection line and a reset power supply; supplying a data signal to the specific data line; and supplying a voltage from the inspection line to the specific data line by turning off the reset transistor and turning on the first control transistor and the second control transistor.

16 . The method of inspecting the display device according to claim 15 , wherein a voltage of the data signal is a voltage corresponding to a gray level of white.

17 . The method of inspecting the display device according to claim 15 , wherein the voltage from the inspection line is a voltage corresponding to a data signal of black.

18 . The method of inspecting the display device according to claim 15 , wherein the specific data line is coupled to pixels of green.

19 . The method of inspecting the display device according to claim 15 , wherein a voltage of the reset power supply is lower than that of the data signal.

20 . The method of inspecting the display device according to claim 15 , further comprising:
supplying a plurality of scan signals to a plurality of scan lines to activate a plurality of pixels coupled to the specific data line in a row when a voltage from the inspection line is supplied to the specific data line.

Assignees

• Samsung Display Co Ltd

Inventors

• Byun Min Woo
• Lee Seung Kyu

Classifications

• G09G2300/0426

  Layout of electrodes and connections · 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

• G09G3/006 Primary

  Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays (testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309) · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title

• G09G2300/08

  Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements · CPC title