Liquid crystal display device manufacturing method, liquid crystal display device manufactured with the liquid crystal display device manufacturing method, and liquid-crystal-display-device-mounted electronic device

• US 20050134791A1
• Filed: 12/08/2004
• Published: 06/23/2005
• Est. Priority Date: 12/17/2003
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Sakurada, Kazuaki, Iwata, Yuji
• Granted Patent: US 7,433,013 B2
• Time in Patent Office: Days
• US Class Current: 349/187
• CPC Class Codes: G02F 1/133351 Manufacturing of individual cells out of a plurality of cells, e.g. by dicing
• CPC Class Codes: G02F 1/13415 Drop filling process

Abstract

A manufacturing method of a liquid crystal display device enables decreasing the fraction defective of a liquid crystal panel upon manufacturing the liquid crystal display device using the liquid crystal dropping model in a large-sized board. The manufacturing method of a liquid crystal display device includes a preliminary liquid crystal coating process, a film thickness measurement process, a liquid crystal discharge condition calculation process, and a liquid crystal coating process. The preliminary liquid crystal coating process scans a plurality of the cell forming areas of the sample board with a droplet discharge head in a predetermined scanning direction, and coats the liquid crystal with a predetermined discharge condition. The film thickness measurement process respectively measures the film thickness of the liquid crystal coated onto the plurality of the cell forming areas. The liquid crystal discharge condition calculation process calculates the liquid crystal discharge condition to discharge to the plurality of the cell forming areas from the droplet discharge head, based on the measuring result of film thickness. The liquid crystal coating process scans the plurality of the cell forming areas of the first motherboard with the droplet discharge head in the predetermined scanning direction, and coats the liquid crystal in accordance with the liquid crystal discharge condition calculated.

Claims

1. A manufacturing method of a liquid crystal display device dropping liquid crystal to at least either one of a first motherboard and a second motherboard, forming a large-sized panel structure that contains plurality of liquid crystal panel units by pasting together the first motherboard and the second motherboard with sealing material, and cutting the plurality of liquid crystal panel units that contains a plurality of liquid panel units, the method comprising;

a preliminary liquid crystal coating process, to coat and discharge liquid crystal to a plurality of cell forming areas of a sample board as well as scan a droplet discharge head toward a predetermined scanning direction under a predetermined discharge condition;

a film thickness measurement process, to respectively measure each of the film thicknesses of liquid crystal coated onto the plurality of cell forming areas;

a liquid crystal discharge condition calculation process, to calculate a liquid crystal discharge condition to discharge liquid crystal to the plurality of cell forming areas from the droplet discharge head, based on the measuring result of film thicknesses in the film thickness measurement process; and

a liquid crystal coating process, to coat liquid crystal to the plurality of cell forming areas in the first motherboard or the second motherboard as well as scan the droplet discharge head toward the predetermined scanning direction in accordance with the liquid crystal discharge condition calculated in the droplet discharge condition calculation process.

2. The manufacturing method of liquid crystal display device according to claim 1, further including in the liquid crystal discharge condition calculation process, individually calculating a liquid crystal discharge condition of the droplet discharge head by calculating individually for every cell forming area, based on the film thickness of liquid crystal measured by the film thickness measurement process over the plurality of cell forming areas.

3. The manufacturing method of liquid crystal display device according to claim 1, further including in the liquid crystal discharge condition calculation process, analyzing a fluctuation pattern of the film thickness of liquid crystal measured in the film thickness measurement process on the plurality of the cell forming, and calculating the liquid crystal discharge condition of the droplet discharge head discharging to the plurality of cell forming areas in accordance with a analyzed fluctuation pattern.

4. The manufacturing method of a liquid crystal display device according to claim 3, further including analyzing the fluctuation pattern of the film thickness of liquid crystal over the entire plurality of cell forming areas, or by column or row.

5. The manufacturing method of liquid crystal display device according to claim 1, further including setting the discharge condition by a driving voltage waveform of the droplet discharge head and/or a liquid crystal dropping frequency.

6. The manufacturing method of liquid crystal display device, according to claim 1, further including warming the droplet discharge head by a warmer.

7. A liquid crystal display device manufactured with the manufacturing method of liquid crystal display device, according to claim 1.

8. An electronic device, provided with the liquid crystal display device according to claim 7.