DISPLAY PANEL AND METHOD FOR TESTING DISPLAY PANEL

• US 20140145739A1
• Filed: 07/16/2013
• Published: 05/29/2014
• Est. Priority Date: 11/23/2012
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: PARK, Jae Chul, PARK, Je Hyung
• Granted Patent: US 9,576,512 B2
• Time in Patent Office: Days
• US Class Current: 324/750.3
• CPC Class Codes: G09G 3/006 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 Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters

Abstract

A display panel including a display part including a plurality of sub-pixels configured to display a plurality of colors, and a plurality of data lines connected with the sub-pixels; a first test part configured to supply a test signal to (2K−1)th data lines (‘K’ is an integer above 0) by each color for the sub-pixels among the plurality of data lines; and a second test part configured to supply a test signal to 2Kth data lines by each color for the sub-pixels among the plurality of data lines when the first test part supplies the test signal. Further, a polarity of the test signal supplied by the second test part is opposite to a polarity of the test signal supplied by the first test part.

Claims

1. A method of testing a display panel including a plurality of first sub-pixels for displaying a first color, a plurality of second sub-pixels for displaying a second color, and a plurality of third sub-pixels for displaying a third color, the method comprising:

supplying a first test signal to (2K−

1)th first data lines (‘

K’

is an integer above

     0) among first data lines connected with the first sub-pixels; and

supplying a second test signal whose polarity is opposite to that of the first test signal to 2Kth first data lines among the first data lines when the first test signal is supplied to the (2K−

1)th first data lines so as to alternately light the first sub-pixels connected with the (2K−

1)th first data lines and the first sub-pixels connected with the 2Kth first data lines.

2. The method of claim 1, wherein the supplying the first test signal to the (2K−

1)th first data lines is performed by supplying the first test signal to the (2K−

1)th first data lines connected with the first sub-pixels so as to display a red color.

3. The method of claim 1, further comprising:

supplying the second test signal to (2K−

1)th second data lines among second data lines connected with the second sub-pixels when the first test signal is supplied to the (2K−

1)th first data lines;

supplying the first test signal to 2Kth second data lines when the first test signal is supplied to the (2K−

1)th first data lines so as to alternately light the second sub-pixels connected with the (2K−

1)th second data lines and the second sub-pixels connected with the 2Kth second data lines;

supplying the first test signal to (2K−

1)th third data lines among third data lines connected with the third sub-pixels when the first test signal is supplied to the (2K−

1)th first data lines; and

supplying the second test signal to 2Kth third data lines when the first test signal is supplied to the (2K−

1)th first data lines so as to alternately light the third sub-pixels connected with (2K−

1)th third data lines and the third sub-pixels connected with the 2Kth third data lines.

4. The method of claim 3, wherein the supplying the first test signal to the (2K−

1)th first data lines includes supplying the first test signal to the (2K−

1)th first data lines connected with the first sub-pixels so as to display a red color,

wherein the supplying the second test signal to the (2K−

1)th second data lines includes supplying the second test signal to the (2K−

1)th second data lines connected with the second sub-pixels to display a green color, and

wherein the supplying the first test signal to the (2K−

1)th third data lines includes supplying the first test signal to the (2K−

1)th third data lines connected with the third sub-pixels to display a blue color.

5. A method of testing a display panel, the method comprising:

supplying a positive polarity test signal to (2K−

1)th data lines (‘

K’

is an integer above

     0) among a plurality of data lines included in the display panel, and simultaneously supplying a negative polarity test signal to 2Kth data lines; and

supplying the negative polarity test signal to the (2K−

1)th data lines, and simultaneously supplying the positive polarity test signal to the 2Kth data lines.

6. The method of claim 5, further comprising:

repetitively performing the supplying steps after a voltage of the test signal is changed.

7. A display panel, comprising:

a display part including a plurality of sub-pixels configured to display a plurality of colors, and a plurality of data lines connected with the sub-pixels;

a first test part configured to supply a test signal to (2K−

1)th data lines (‘

K’

is an integer above

     0) by each color for the sub-pixels among the plurality of data lines; and

a second test part configured to supply a test signal to 2Kth data lines by each color for the sub-pixels among the plurality of data lines when the first test part supplies the test signal,

wherein a polarity of the test signal supplied by the second test part is opposite to a polarity of the test signal supplied by the first test part.

8. The display panel of claim 7, wherein the first test part and the second test part alternately light the sub-pixels connected with the (2K−

1)th data lines and the sub-pixels connected with the 2Kth data lines by each color for the sub-pixels.

9. The display panel of claim 7, wherein the first test part is configured to supply a positive polarity test signal to (2K−

1)th first data lines among first data lines connected with first sub-pixels, supply a negative polarity test signal to (2K−

1)th second data lines among second data lines connected with second sub-pixels positioned next to the first sub-pixels, and supply the positive polarity test signal to (2K−

1)th third data lines among third data lines connected with third sub-pixels positioned next to the second sub-pixels, and

wherein the second test part is further configured to supply the negative polarity test signal to 2Kth first data lines, supply the positive polarity test signal to 2Kth second data lines, and supply the negative polarity test signal to 2Kth third data lines.

10. The display panel of claim 7, wherein the first test part is further configured to alternately supply positive polarity and negative polarity test signals, in sequence, by firstly supplying the positive polarity test signal and secondly supplying the negative polarity test signal to (2K−

1)th first data lines among first data lines connected with first sub-pixels, and

wherein the second test part is further configured to alternately supply negative polarity and positive polarity test signals, in sequence, by firstly supplying the negative polarity test signal and secondly supplying the positive polarity test signal to 2Kth first data lines, so as to alternately light on the first sub-pixels connected with the (2K−

1)th first data lines and the first sub-pixels connected with the 2Kth first data lines.

11. The display panel of claim 7, wherein the first test part and the second test part are further configured to simultaneously supply the test signals having opposite polarities to the (2K−

1)th data lines and the 2Kth data lines by each color for the sub-pixels so as to perform a lighting test in a column inversion method.

12. The display panel of claim 7, wherein the first test part includes:

a first test pad configured to be in contact with a test apparatus so as to receive a first test signal from the test apparatus, wherein a positive polarity test signal and negative polarity test signal with respect to a common voltage are sequentially supplied and alternately applied as the first test signal;

a second test pad configured to be in contact with the test apparatus so as to receive a second test signal from the test apparatus, wherein a negative polarity test signal and positive polarity test signal with respect to a common voltage are sequentially supplied and alternately applied as the second test signal;

a third test pad configured to be in contact with the test apparatus so as to receive the first test signal from the test apparatus;

a first connection line connecting the first test pad with (2K−

1)th first data lines among first data lines connected with first sub-pixels to display a first color;

a second connection line connecting the second test pad with (2K−

1)th second data lines among second data lines connected with second sub-pixels to display a second color; and

a third connection line connecting the third test pad with (2K−

1)th third data lines among third data lines connected with third sub-pixels to display a third color.

13. The display panel of claim 12, wherein the second test part includes:

a fourth test pad configured to be in contact with the test apparatus so as to receive the second test signal from the test apparatus;

a fifth test pad configured to be in contact with the test apparatus so as to receive the first test signal from the test apparatus;

a sixth test pad configured to be in contact with the test apparatus so as to receive the second test signal from the test apparatus;

a fourth connection line connecting the fourth test pad with 2Kth first data lines;

a fifth connection line connecting the fifth test pad with 2Kth second data lines; and

a sixth connection line connecting the sixth test pad with 2Kth third data lines.