Device for cutting liquid crystal display panel and method for cutting using the same

• US 6,774,978 B2
• Filed: 04/22/2002
• Issued: 08/10/2004
• Est. Priority Date: 02/09/2002
• Status: Expired due to Term

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Shin, Sang-Sun
• Primary Examiner(s): Nguyen, Dung T.
• Assistant Examiner(s): SCHECHTER, ANDREW M
• Application Number:
  US10/126,698
• Publication Number:
  US 20030151717A1
• Time in Patent Office: 841 Days
• Field of Search: 349/158, 349/187, 225/96.5, 838/85
• US Class Current: 349/187
• CPC Class Codes: C03B 33/07 Cutting armoured, multi-layered, coated or laminated, glass products
• CPC Class Codes: G02F 1/133351 Manufacturing of individual cells out of a plurality of cells, e.g. by dicing
• CPC Class Codes: Y02P 40/57 Improving the yield, e-g- reduction of reject rates
• CPC Class Codes: Y10T 225/325 With means to apply moment of force to weakened work
• CPC Class Codes: Y10T 83/0378 On opposite sides of work

Abstract

A device for cutting a liquid crystal display panel includes a first scribing unit for forming a first scribing line at first and second mother substrates by using first and second wheels and pressing at least a portion of the first scribing line with a first roll, a second scribing unit for forming a second scribing line at the first and second mother substrates by using third and fourth wheels and pressing at least a portion of the second scribing line with a second roll, and a first rotating unit for rotating the first and second mother substrates to form the second scribing line.

Claims

1. A device for cutting a liquid crystal display panel, comprising:

a first scribing unit for forming a first set of scribing lines at first and second mother substrates by using first and second wheels and pressing at least a portion of the first set of scribing lines with a first roll;

a second scribing unit for forming a second set of scribing lines at the first and second mother substrates by using third and fourth wheels and pressing at least a portion of the second set of scribing lines with a second roll; and

a first rotating unit for rotating the first and second mother substrates to form the second set of scribing lines.

2. The device of claim 1, wherein the first mother substrate including a plurality thin film transistor substrates is stacked on the second mother substrate including a plurality of color filter substrates.

3. The device of claim 1, wherein the first wheel moves to form the first scribing line in a first direction and the first roll moves to press the first scribing line in a second direction.

4. The device of claim 1, wherein the first and second rolls are formed of urethane.

5. The device of claim 1, wherein the first rotating unit rotates the first and second mother substrates by 90°

.

6. A device for cutting a liquid crystal display panel comprising:

a first scribing unit for loading and holding first and second mother substrates between first and second tables, forming a first scribing line on first and second mother substrates with first and second wheels, and cutting the first and second mother substrates by moving the first and second tables;

a first rotating unit for rotating the first and second mother substrates by 90°

; and

a second scribing unit for loading and holding the first and second mother substrates between third and fourth tables, forming a second scribing line on the first and second mother substrates with the third and fourth wheels to cut the first and second mother substrates by moving the third and fourth tables.

7. The device of claim 6, wherein the first mother substrate including a plurality of thin film transistor substrates is stacked on the second mother substrates including a plurality of color filter substrates.

8. The device of claim 6, wherein at least one of the first to fourth tables has a plurality of vacuum suction holes for holding the substrate.

9. The device of claim 6, wherein at least one of the first to fourth tables has a vacuum suction unit.

10. A method for cutting a liquid crystal display panel, comprising:

forming a first set of scribing lines at first and second mother substrates;

pressing at least a portion of the first set of scribing lines with a first roll to cut the first and second mother substrates;

forming a second set of scribing lines at the first and second mother substrates; and

pressing at least a portion of the second set of scribing lines with a second roll to cut the first and second mother substrates,

wherein one of the first and second sets of scribing lines have lines that are at different relative positions on the respective first and second mother substrates.

11. The method of claim 10, wherein the first mother substrate including a plurality of thin film transistor substrates is stacked on the second mother substrate including a plurality of color filter substrates.

12. The device of claim 10, wherein the first and second rolls are formed of urethane.

13. The method of claim 10, wherein further comprising rotating the first and second mother substrates by 90°

prior to the second scribing line.

14. A method for cutting a liquid crystal display panel, comprising:

loading and holding first and second mother substrates between first and second tables;

forming a first scribing line at first and second mother substrates;

cutting the first and second mother substrates by moving the first and second tables;

loading and holding the first and second mother substrates between third and fourth tables;

forming a second scribing line at the first and second mother substrates; and

cutting the first and second mother substrates by moving the third and fourth tables.

15. The method of claim 14, wherein the first mother substrates including a plurality of thin film transistor substrates is stacked on the second mother substrate including a plurality of color filter substrates.

16. The method of claim 14, further comprising rotating the first and second mother substrates by 90°

prior to the loading and holding the first and second mother substrates between third and fourth tables.

17. The method of claim 14, wherein at least one of the first to fourth tables has a plurality of vacuum suction holes for holding the substrates.

18. The method of claim 14, wherein the at least one of the first to fourth tables has a vacuum suction unit.

19. A method for cutting a liquid crystal display panel, comprising:

holding first and second mother substrates to protrude a dummy region of the first and second mother substrates from a first table;

fanning a first scribing line at the protruded first and second mother substrates with first upper and lower wheels;

removing the dummy region from the first and second mother substrates along the first scribing line by using a robot grip;

moving the first and second mother substrates without the dummy region between the first and second tables spaced apart from each other to form a second scribing line at the first and second mother substrates by using the first upper and lower wheels; and

moving the first and second tables to cut the first and second mother substrates.

20. The method of claim 19, further comprising pressing at least a portion of one of the first and second scribing lines with a roll.

21. The method of claim 19, further comprising pressing one of the first and second scribing lines along the one of the first and second scribing lines with a roll.

22. The method of claim 20, wherein the roll is formed of urethane.

23. The method of claim 21, wherein the roll is formed of urethane.

24. The method of claim 19, wherein the first mother substrate including a plurality of thin film transistor substrates is stacked on the second mother substrate including a plurality of color filter substrates.

25. The method of claim 19, wherein at least one of the first and fourth tables has a plurality of vacuum suction holes for holding the substrates.

26. The method of claim 19, wherein at least one of the first to fourth tables has a vacuum suction unit.