METHOD OF MANUFACTURING LIQUID CRYSTAL DISPLAY

• US 20090213320A1
• Filed: 02/19/2009
• Published: 08/27/2009
• Est. Priority Date: 02/22/2008
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Son, Jong-Ho, Park, Seung-Beom, Lyu, Jae-Jin
• Granted Patent: US 8,169,575 B2
• Time in Patent Office: Days
• US Class Current: 349/191
• CPC Class Codes: G02F 1/133397 for suppressing after-image or image-sticking
• CPC Class Codes: G02F 1/133703 by introducing organic surfactant additives into the liquid crystal material
• CPC Class Codes: G02F 1/133707 Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
• CPC Class Codes: G02F 1/133753 with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle
• CPC Class Codes: G02F 1/133788 by light irradiation, e.g. linearly polarised light photo-polymerisation
• CPC Class Codes: G02F 2201/086 UV absorbing

Abstract

A method of manufacturing a liquid crystal display includes providing a first display panel, providing a second display panel, disposing liquid crystals and an alignment additive between the first display panel and the second display panel, applying a gradually increasing pre-tilting voltage to the first display panel and the second display panel, and hardening the alignment additive.

Claims

1. A method of manufacturing a liquid crystal display, the method comprising:

providing a first display panel;

providing a second display panel;

disposing liquid crystals and an alignment additive between the first display panel and the second display panel;

applying a gradually increasing pre-tilting voltage to the first display panel and the second display panel; and

hardening the alignment additive.

2. The method of claim 1, wherein the pre-tilting voltage gradually increases stepwise.

3. The method of claim 1, wherein the applying of the pre-tilting voltage gradually increases linearly.

4. The method of claim 1, wherein the pre-tilting voltage gradually increases during a first voltage applying period and stepwise during a second voltage applying period.

5. The method of claim 1, wherein the alignment additive comprises an ultraviolet (UV) monomer.

6. The method of claim 5, wherein hardening the alignment additive comprises irradiating UV light onto the alignment additive while applying the pre-tilting voltage.

7. The method of claim 5, wherein the UV monomer is present in an amount greater than 0 weight % and less than or equal to 1 weight % based on the total weight of the liquid crystals.

8. The method of claim 1, wherein the providing the first display panel comprises providing a first insulating substrate and forming a color filter, a black matrix, a pixel electrode, and a first alignment layer on the first insulating substrate, and

wherein providing the second display panel comprises providing a second insulating substrate and forming a common electrode and a second alignment layer on the second insulating substrate.

9. The method of claim 8, wherein forming the pixel electrode comprises forming a pixel electrode conductive layer on the first insulating substrate and patterning the pixel electrode conductive layer to form a plurality of micro electrodes and a plurality of micro slits.

10. The method of claim 8, wherein the alignment additive comprises an ultraviolet (UV) monomer, and hardening the alignment additive comprises irradiating UV light onto the alignment additive.

11. The method of claim 1, wherein providing the first display panel comprises providing a first insulating substrate and forming a pixel electrode and a first alignment layer on the first insulating substrate, and

wherein providing the second display panel comprises providing a second insulating substrate and forming a color filter, a black matrix, a common electrode, and a second alignment layer on the second insulating substrate.

12. The method of claim 11, wherein forming the pixel electrode comprises forming a pixel electrode conductive layer on the first insulating substrate and patterning the pixel electrode conductive layer to form a plurality of micro electrodes and a plurality of micro slits.

20. The method of claim 1, further comprising disposing an UV-hardening initiator between the first display panel and the second display panel, the UV-hardening initiator being present in an amount greater than 0 weight % and less than or equal to 0.05 weight % based on the total weight of the liquid crystals.

13. A method of manufacturing a liquid crystal display, the method comprising:

providing a first display panel on which a color filter, a black matrix, a pixel electrode, and a first alignment layer are disposed;

providing a second display panel on which a common electrode and a second alignment layer are disposed;

disposing liquid crystals and a reactive monomer between the first display panel and the second display panel;

applying a gradually increasing pre-tilting voltage to the first display panel and the second display panel; and

irradiating light downward from an upper portion to a lower portion of the second display panel to harden the reactive monomer.

14. The method of claim 13, wherein the pre-tilting voltage gradually increases stepwise.

15. The method of claim 13, wherein the pre-tilting voltage gradually increases linearly.

16. The method of claim 13, wherein the applying of the pre-tilting voltage gradually increases during a first voltage applying period and stepwise during a second voltage applying period.

17. The method of claim 13, wherein providing the first display panel comprises providing a first insulating substrate, forming a pixel electrode conductive layer on the first insulating substrate, and patterning the pixel electrode conductive layer to form a plurality of micro electrodes and a plurality of micro slits.

18. The method of claim 13, wherein the reactive monomer comprises an ultraviolet (UV) monomer, and wherein hardening the reactive monomer comprises irradiating UV light onto the reactive monomer.

19. The method of claim 18, wherein the UV monomer is present in an amount greater than 0 weight % and less than or equal to 1 weight % based on the total weight of the liquid crystals.