METHOD OF MANUFACTURING LIQUID CRYSTAL DISPLAY DEVICE

• US 20110297645A1
• Filed: 06/08/2011
• Published: 12/08/2011
• Est. Priority Date: 06/08/2010
• Status: Active Grant

• Current Assignee: Japan Display Central Incorporated (Japan Display Incorporated)
• Original Assignee: Toshiba Mobile Display Company Limited (Japan Display Incorporated)
• Inventors: Miyata, Sumio
• Granted Patent: US 8,551,350 B2
• Time in Patent Office: Days
• US Class Current: 216/23
• CPC Class Codes: B32B 2457/202 LCD, i.e. liquid crystal displays
• CPC Class Codes: B32B 37/1018 using only vacuum
• CPC Class Codes: G02F 1/133351 Manufacturing of individual cells out of a plurality of cells, e.g. by dicing
• CPC Class Codes: G02F 1/1341 Filling or closing of cells

Abstract

In one embodiment, a first substrate having a plurality of array regions is prepared. A seal material is formed in each of the array regions. A peripheral seal material is arranged outside the array regions extending in a first direction. The peripheral seal material has an exhaust opening provided at a portion of the peripheral seal material extending in a second direction. A dummy seal material is formed between the peripheral seal material extending in the first direction and the seal material formed in the array region. A second substrate is arranged on a surface of the first substrate in a jig. The inside of the jig is decompressed, and the atmosphere between the first and second substrates is exhausted while applying a pressure to the first and second substrates. Then, the first and second substrates are attached by curing the seal material, the peripheral seal material and the dummy seal material.

Claims

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

preparing a first substrate having a plurality of array regions arranged in a first direction and a second direction orthogonally crossing the first direction;

forming a seal material in each of the array regions on the first substrate;

forming a peripheral seal material arranged outside the array regions and extending in the first and second directions, the peripheral seal material having an exhaust opening provided at a portion of the peripheral seal material extending in the second direction on the first substrate;

forming a dummy seal material between the peripheral seal material extending in the first direction and the seal material formed in the array region;

arranging a second substrate on a surface of the first substrate in which the seal material is formed, in a jig;

decompressing the inside of the jig;

exhausting atmosphere between the first and second substrates in the jig while applying a pressure to the first and second substrates; and

attaching the first and second substrates by curing the seal material, the peripheral seal material and the dummy seal material.

2. The method of manufacturing a liquid crystal display device according to claim 1, wherein the steps of forming the seal material, the peripheral seal material, and the dummy seal material respectively include the steps of:

forming the peripheral seal material having a first line portion and a second line portion extending in the first direction,

forming the seal material having a first seal material formed in a first array region adjacent to the first line portion and a second seal material formed in a second array region adjacent to the second line portion, and

forming the dummy seal in an approximately middle position between the second line portion and the second seal material.

3. The method of manufacturing a liquid crystal display device according to claim 2, wherein a distance (D1) between the first line portion and the first seal material in the second direction is approximately the same as a distance (D2) between the dummy seal material and the second seal material in the second direction and a distance (D3) between the second line portion and the dummy seal material in the second direction.

4. The method of manufacturing a liquid crystal display device according to claim 3, wherein a distance (D4) between the seal materials respectively formed in the adjacent array regions in the second direction is approximately the same as the distance (D1).

5. The method of manufacturing a liquid crystal display device according to claim 1, wherein the step of forming the peripheral seal material includes a step of forming the exhaust opening at a position corresponding to a space formed between the adjacent seal materials in the second direction.

6. The method of manufacturing a liquid crystal display device according to claim 1, wherein the seal material, the peripheral seal material, and the dummy seal material are formed of the same material using at least one of a UC curing resin and a thermosetting resin.

7. The method of manufacturing a liquid crystal display device according to claim 1, wherein the seal material, the peripheral seal material, and the dummy seal material are formed of a screen printing method or a drawing method using a dispenser.

8. The method of manufacturing a liquid crystal display device according to claim 1, wherein a dummy seal element is arranged adjacent to the exhaust opening to control an exhaust velocity of atmosphere.

9. The method of manufacturing a liquid crystal display device according to claim 1, further comprising a step of polishing the surfaces of the first and second substrates after sealing the exhaust opening.

10. The method of manufacturing a liquid crystal display device according to claim 9, wherein the step of polishing the surfaces of the first and second substrates is performed by at least one of the chemical polishing method and the mechanical polishing method.

11. A method of manufacturing a liquid crystal display device, comprising the steps of:

preparing a first substrate having a plurality of array regions arranged in a first direction and a second direction orthogonally crossing the first direction;

forming a seal material having an injecting mouth in each of the array regions on the first substrate;

forming a peripheral seal material arranged outside the array region and extending in the first and second directions, the peripheral seal material having an exhaust opening provided at a portion of the peripheral seal material extending in the second direction on the first substrate;

forming a dummy seal material between the peripheral seal material extending in the first direction and the seal material formed in the array region;

arranging a second substrate on a surface of the first substrate in which the seal material is formed on the surface, in a jig;

decompressing the inside of the jig;

exhausting atmosphere between the first and second substrates in the jig while applying a pressure to the first and second substrates;

attaching the first and second substrates to form a substrate set by curing the seal material, the peripheral seal material and the dummy seal material;

cutting the substrate set into display panel units each having a plurality of liquid crystal display panels; and

injecting a liquid crystal material into the respective display panels through the injecting mouth.

12. The method of manufacturing a liquid crystal display device according to claim 11, further comprising a step of polishing the surfaces of the first and second substrates after sealing the exhaust opening.

13. The method of manufacturing a liquid crystal display device according to claim 12, wherein the step of polishing the surfaces of the first and second substrates is performed by at least one of the chemical polishing method and the mechanical polishing method.

14. The method of manufacturing a liquid crystal display device according to claim 11, wherein the step of forming the peripheral seal material includes a step of forming the exhaust opening at a position corresponding to a space formed between the adjacent seal materials in the second direction.