Display device and testing method thereof

• US 10,134,646 B2
• Filed: 12/20/2016
• Issued: 11/20/2018
• Est. Priority Date: 08/31/2016
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Byun, Hyuntae, Song, Eunah, Kim, Junggi, Cho, Kwang Nam
• Primary Examiner(s): CAMPBELL, SHAUN M
• Application Number:
  US15/385,255
• Publication Number:
  US 20180061722A1
• Time in Patent Office: 700 Days
• Field of Search: None
• 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: H01L 22/14 for electrical parameters, e.g. resistance, deep-levels, CV, diffusions by electrical means
• CPC Class Codes: H01L 22/32 Additional lead-in metallisation on a device or substrate, e.g. additional pads or pad portions, lines in the scribe line, sacrificed conductors arrangements for conducting electric current to or from the solid state body in operation H01L23/48
• CPC Class Codes: H10K 2102/341 Short-circuit prevention
• CPC Class Codes: H10K 50/841 Self-supporting sealing arrangements
• CPC Class Codes: H10K 50/8426 Peripheral sealing arrangements, e.g. adhesives, sealants
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 59/121 characterised by the geometry or disposition of pixel elements
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/8722 Peripheral sealing arrangements, e.g. adhesives, sealants
• CPC Class Codes: H10K 59/8731 multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 71/70 Testing, e.g. accelerated lifetime tests
• CPC Class Codes: H10K 71/861 Repairing

Abstract

A display device and a testing method thereof are disclosed, in which a defect caused by an overflow of an organic film constituting an encapsulation film can be detected. The display device comprises a substrate including a display area where pixels are arranged, and a pad area including a plurality of pads formed outside the display area; an encapsulation film covering the display area, including at least one inorganic film and at least one organic film; a dam arranged between the display area and the pad area; and a conductive testing line arranged between the dam and the pad area and not electrically connected with another conductive line or electrode arranged on the substrate.

Claims

1. A display device comprising:

a substrate including a display area where pixels are arranged, and a pad area including a plurality of pads formed outside the display area;

an encapsulation film covering the display area, the encapsulation film including at least one inorganic film and at least one organic film;

a first dam arranged between the display area and the pad area; and

a conductive testing line arranged between the first dam and the pad area,

wherein the conductive testing line is electrically isolated from any other conductive lines or electrodes formed on the substrate.

2. The display device of claim 1, wherein the encapsulation film includes:

a first inorganic film covering the display area;

an organic film covering the first inorganic film; and

a second inorganic film covering the organic film,

wherein the first inorganic film does not cover the conductive testing line.

3. The display device of claim 2, wherein the second inorganic film covers the first dam and the conductive testing line.

4. The display device of claim 1, wherein the first dam and the conductive testing line are arranged to surround the display area.

5. The display device of claim 1, wherein the first dam is arranged to surround four sides of the display area, the conductive testing line includes first, second, third and fourth conductive testing lines respectively arranged along the four sides of the display area, and the first, second, third and fourth conductive testing lines are arranged to be spaced apart from one another and electrically isolated with respect to one another.

6. The display device of claim 1, further comprising a second dam arranged between the first dam and the pad area.

7. The display device of claim 6, wherein the conductive testing line is arranged between the first dam and the second dam.

8. The display device of claim 1, wherein the conductive testing line is arranged between the first dam and the display area.

9. The display device of claim 1, wherein each of the pixels includes an organic light emitting diode that includes an anode electrode and a cathode electrode, and the conductive testing line is made of the same material as that of at least one of the anode electrode and the cathode electrode.