Sealing method for flat panel display device

Patent metadata

Field	Value
Publication number	US-9530981-B2
Application number	US-201313949391-A
Country	US
Kind code	B2
Filing date	Jul 24, 2013
Priority date	Jan 31, 2013
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

A method of sealing a flat panel display device by using laser and a charge-coupled device (CCD) camera. The sealing method includes applying a sealant around a light-emitting unit on a substrate and covering above the light-emitting unit with the encapsulating substrate; irradiating light onto a sealant area to harden the sealant for the first time (first hardening); monitoring a hardening state of the sealant; and further irradiating light onto a region of the sealant in a bad hardening state based on the monitoring result to harden the region of the sealant in the bad hardening state (second hardening). The sealing method may prevent a sealing flaw caused from insufficient laser irradiation dosage, and thus ensure a more stable sealed structure. This may improve quality of the flat-plan-display-device.

First claim

What is claimed is:

1. A method of sealing a flat panel display device, the method comprising:
applying a sealant around a light-emitting unit on a substrate and covering above the light-emitting unit with the encapsulating substrate;
irradiating light onto a sealant area to harden the sealant for a first time forming a first hardening;
monitoring a hardening state of the sealant; and
further irradiating light onto a region of the sealant in a bad hardening state based on the monitoring result to harden the region of the sealant in a bad hardening state forming a second hardening,
wherein the second light irradiation dosage for the second hardening is about 70-80% of the first light irradiation dosage for the first hardening.

2. The method of claim 1 , wherein the monitoring of the hardening state of the sealant comprises real-time monitoring of the sealant area through a charge-coupled device (CCD) camera.

3. The method of claim 2 , wherein the CCD camera monitors the hardening state of the sealant while moving together with a light irradiating head.

4. The method of claim 2 , wherein the method further comprises installing a neutral density (ND) filter in the CCD camera.

5. The method of claim 1 , wherein the sealant comprises a frit.

6. The method of claim 1 , wherein the light comprises laser light.

7. The method of claim 1 , wherein the method further comprises mounting onto the encapsulating substrate a sealant hardening mask with a light transmitting slit which is in a shape corresponding to a shape of the sealant area, and light is irradiated onto the sealant area through the light transmitting slit.

8. A method of sealing a flat panel display device, the method comprising:
applying a sealant around a light-emitting unit on a substrate and covering above the light-emitting unit with the encapsulating substrate;
irradiating light onto a sealant area to harden the sealant for a first time forming a first hardening using a first light irradiating dosage;
monitoring a hardening state of the sealant; and
further irradiating light onto a region of the sealant in a bad hardening state based on the monitoring result to harden the region of the sealant in a bad hardening state forming a second hardening using a second light irradiating dosage,
wherein the second light irradiation dosage for the second hardening is about 70-80% of the first light irradiation dosage for the first hardening.

9. The method of claim 8 , wherein the monitoring of the hardening state of the sealant comprises realtime monitoring of the sealant area through a charge-coupled device (CCD) camera.

10. The method of claim 9 , wherein the CCD camera monitors the hardening state of the sealant while moving together with a light irradiating head.

11. The method of claim 10 , wherein the method further comprises installing a neutral density (ND) filter in the CCD camera.

12. The method of claim 8 , wherein the sealant comprises a frit.

13. The method of claim 8 , wherein the light comprises laser light.

14. The method of claim 8 , wherein the method further comprises mounting onto the encapsulating substrate a sealant hardening mask with a light transmitting slit which is in a shape corresponding to a shape of the sealant area, and light is irradiated onto the sealant area through the light transmitting slit.

Assignees

• Samsung Display Co Ltd

Inventors

• Koo Min-Sang

Classifications

• H10K71/00 Primary

  Manufacture or treatment specially adapted for the organic devices covered by this subclass · CPC title

• H10K59/8722

  Peripheral sealing arrangements, e.g. adhesives, sealants · CPC title

• H01L51/5246 Primary

  Electricity · mapped topic

• H10K50/8426 Primary

  Peripheral sealing arrangements, e.g. adhesives, sealants · CPC title

• H05B33/10

  Apparatus or processes specially adapted to the manufacture of electroluminescent light sources · CPC title