Display device and method for manufacturing display device

• US 20110121714A1
• Filed: 11/23/2010
• Published: 05/26/2011
• Est. Priority Date: 11/24/2009
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Kim, Joon-Hyung, Park, Jin-Han, Roh, Cheol-Lae
• Granted Patent: US 8,450,916 B2
• Time in Patent Office: Days
• US Class Current: 313/317
• CPC Class Codes: H01J 2211/48 Sealing, e.g. seals specially adapted for leading-in conductors
• CPC Class Codes: H01J 2329/8675 Seals between the frame and the front and/or back plate
• CPC Class Codes: H01J 9/261 the vessel being for a flat panel display for flat discharge lamps H01J9/268
• CPC Class Codes: H10K 50/8426 Peripheral sealing arrangements, e.g. adhesives, sealants
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/871 Self-supporting sealing arrangements
• CPC Class Codes: H10K 59/8722 Peripheral sealing arrangements, e.g. adhesives, sealants

Abstract

A display device including a first substrate; a display unit on the first substrate, the display unit displaying an image; and a second substrate facing the first substrate with the display unit interposed therebetween, wherein the first substrate and the second substrate are optical contact bonded to each other.

Claims

1. A display device, comprising:

a first substrate;

a display unit on the first substrate, the display unit displaying an image; and

a second substrate facing the first substrate with the display unit interposed therebetween,

wherein the first substrate and the second substrate are optical contact bonded to each other.

2. The display device as claimed in claim 1, wherein the optical contact bond between the first substrate and the second substrate is formed by a Van der Waal'"'"'s force between a first molecule of the first substrate and a second molecule of the second substrate.

3. The display device as claimed in claim 1, wherein optical contact bonding portions of the first substrate and the second substrate are made of amorphous glass.

4. The display device as claimed in claim 3, wherein a first portion of the first substrate contacting the second substrate and a second portion of the second substrate contacting the first substrate are optical surfaces.

5. The display device as claimed in claim 4, wherein the first and second portions have a surface flatness of about 0.1λ

to about 0.25λ

(λ

is substantially 632.8 nm).

6. The display device as claimed in claim 5, wherein the first and second portions have a maximum peak-to-valley roughness of about 100 to about 500 Å

or a root-mean-square roughness (RMS value) of about 1 to about 10 Å

.

7. The display device as claimed in claim 6, wherein the first and second portions have a scratch and dig of about 60-40.

8. The display device as claimed in claim 1, wherein the display unit includes an organic light emitting diode for emitting light.

9. The display device as claimed in claim 1, wherein the first substrate includes a second protrusion protruding in the direction of the second substrate, the second protrusion contacting the second substrate.

10. The display device as claimed in claim 1, wherein the second substrate includes a first protrusion protruding in the direction of the first substrate and contacting the first substrate.

11. The display device as claimed in claim 10, wherein the first substrate includes a second protrusion protruding in the direction of the second substrate contacting the second substrate, wherein the second protrusion contacts the first protrusion.

12. A method for manufacturing a display device, the method comprising:

preparing a first substrate such that the first substrate has a display unit thereon;

preparing a second substrate such that the second substrate faces the first substrate with the display unit interposed therebetween; and

optical contact bonding the first substrate and the second substrate together.

13. The method as claimed in claim 12, wherein optical contact bonding portions of the first and second substrates are made of amorphous glass.

14. The method as claimed in claim 13, wherein the optical contact bonding portions have a surface flatness of about 0.1λ

to about 0.25λ

(λ

is substantially 632.8 nm), a maximum peak-to-valley roughness of about 100 to about 500 Å

or a root-mean-square roughness (RMS value) of about 1 to about 10 Å

, and a scratch and dig of about 60-40.

15. The method of claim 14, wherein washing the first and second portions includes:

removing inorganic materials from the first and second portions;

removing organic materials from the first and second portions with hydrochloric acid (HCl);

firstly washing the first and second portions with acetone; and

secondly washing the first and second portions with alcohol.

16. The method as claimed in claim 14, wherein the optical contact bonding of the first substrate and the second substrate includes pressing the first and second substrates together with a pressure of about 0.2 to about 1.2 kg/cm².

17. The method as claimed in claim 16, wherein the optical contact bonding the first substrate and the second substrate includes heating the first substrate and the second substrate, and the first and second substrates are heated to a temperature of about 30 to about 520°

C.

18. The method as claimed in claim 12, further comprising:

optically polishing a first portion of the first substrate and a second portion of the second substrate; and

washing the first portion of the first substrate and the second portion of the second substrate,

wherein the polishing and washing are performed prior to the optical contact bonding.

19. The method as claimed in claim 12, wherein the optical contact bonding is performed using a Van der Waal'"'"'s force acting between a first molecule of the first substrate and a second molecule of the second substrate.

20. The method as claimed in claim 12, wherein the first and second substrates are prepared such that at least one of the first and second substrates includes a protrusion protruding in the direction of and contacting the other of the first and second substrates.