(1) Field of the Invention
The present invention relates to a liquid crystal display device, and in particular, to the form of a sealing portion through which a TFT substrate and a facing substrate are pasted together in a liquid crystal display panel.
(2) Related Art Statement
In liquid crystal display devices, the space between the TFT substrate on which pixel electrodes and thin film transistors (TFT's) are formed in a matrix and the facing substrate on which color filters are formed is filled in with liquid crystal, so that molecules of the liquid crystal can be controlled through an electrical field, and thus, images can be formed. In general, a sealing material is applied around the periphery of the facing substrate using a sealing material applying apparatus, referred to as dispenser, and the TFT substrate and the facing substrate are pasted together.
In the case where the space between the substrates is filled in with liquid crystal in accordance with a suction method, the TFT substrate and the facing substrate are pasted together with a sealing material in between and the sealing material is cured, and after that, the inside space is vacuumed and filled with liquid crystal. Meanwhile, in the case where the space between the substrates is filled in with liquid crystal in accordance with a dropping method, liquid crystal is dropped on the TFT substrate before the TFT substrate and the facing substrate are pasted together, and then the facing substrate is pasted to the TFT substrate. After that, the sealing material is cured.
In the case where a sealing material is provided using a dispenser, the sealing material is applied in annular form around the periphery of the facing substrate in such a manner that the starting point of application using a dispenser overlaps with the finishing point, for example. “Patent Document 1” and “Patent Document 2” describe a technology for forming the finishing point or the starting point of application as described above at a distance from the display region toward the outside so that the overlapping portion does not affect the display region.    (Patent document 1) Japanese Unexamined Patent Publication 2003-241204    (Patent Document 2) Japanese Unexamined Patent Publication 2002-122870