Brushing – scrubbing – and general cleaning
Reexamination Certificate
2001-10-09
2002-10-15
Ton, Toan (Department: 2871)
Brushing, scrubbing, and general cleaning
C349S189000
Reexamination Certificate
active
06463977
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device having such an electrode structure that a sealant can be easily cured.
2. Description of the Related Art
Generally, a liquid crystal display (LCD) device controls the light transmissivity of liquid crystal cells in accordance with video signals to thereby display a picture corresponding to the video signals on a liquid crystal panel having the liquid crystal cells arranged in a matrix pattern. To this end, the LCD device includes an active area having the liquid crystal cells arranged in an active matrix type, and driving circuits for driving the liquid crystal cells in the active area. More specifically, the LCD device includes a lower plate in which thin film transistors for switching the liquid crystal cells, driving circuits for driving the thin film transistors and signal lines connected between the driving circuits and the thin film transistors are mounted on a lower substrate; an upper plate having color filters coated on a upper substrate in correspondence with the matrix liquid crystal cells in such a manner to be separated for each cell area by a black matrix stripe, and transparent electrodes coated on the surfaces of the color filters; a spacer provided between the upper plate and the lower plate to assure a certain cell gap; and a liquid crystal cell filled in a space defined between the upper and lower plates by the spacer. Such a liquid crystal display device is fabricated by preparing the upper plate and the lower plate separately to adhere them to each other and then injecting a liquid crystal through liquid crystal injection holes provided at the side portion thereof, and thereafter by coating the liquid crystal injection holes with a sealant and then curing the sealant. In this case, the sealant is cured by irradiating an ultraviolet ray continuously from the side portion and the rear portion after the coating. A reason why an ultraviolet ray is not irradiated from the front portion is because the color filters are coated on the upper substrate to prevent an ultraviolet ray from being transmitted. If the sealant is left alone as it is after the coating upon mass production of the LCD device, however, the sealant with a viscosity flows into the interior thereof. Accordingly, when an ultraviolet ray is irradiated from the side portion and the rear portion of the LCD device, metal signal wiring mounted on the lower substrate shuts off an ultraviolet ray irradiated from the rear portion and thus the flowing sealant is left without being completely cured to react on the liquid crystal, thereby causing a problem in that a stain is produced on the screen. Hereinafter, the above mentioned problem in the LCD device will be described in detail with reference to the accompanying drawings. FIG.
1
and
FIG. 2
is a plan view and a perspective view showing a portion of the LCD device
10
provided liquid crystal injection holes
22
, respectively. In
FIG. 1
, first to third signal wiring
14
,
16
and
18
are arranged at the outer area
28
of an active area
26
in which thin film transistors and pixel electrodes are mounted on a lower plate
12
. A seal
20
coated with an adhesive and injection holes
22
for injecting a liquid crystal are provided in a desired shape. The first signal wiring
14
is gate row lines for applying a low-level voltage to gate lines in the active area
26
, the second wiring
16
is redundancy lines, and the third wiring
18
is common voltage lines for applying a common voltage. After the lower plate having the structure as described above and the upper plate
30
prepared separately were arranged in position and adhered to each other with the aid of the seal coated with an adhesive, a liquid crystal is injected through the liquid crystal injection holes
22
provided at the side portion. The liquid crystal injection holes
22
are sealed by coating the liquid crystal injection holes
22
with a sealant
24
with a viscosity and thereafter curing the same by a continuous irradiation of ultraviolet ray (UV) before the sealant
24
flows into the interior thereof. In this case, since a major area of the upper plate
30
of the LCD device
10
is coated with the color filters to shield a UV, the UV is usually irradiated from the side portion and the rear portion of the LCD device as shown in FIG.
2
.
By the way, if the LCD device is left alone for more than a certain time after coating of the sealant upon its mass production, the sealant flows into an area in which the first to third signal wiring
14
,
16
and
18
are arranged. In this case, since the signal wiring arranged on the lower plate, particularly, the third signal wiring
18
adjacent to the liquid crystal injection holes
22
shuts off a UV irradiated from the rear portion of the LCD device, there occurs a phenomenon that the sealant
24
flowing into the third signal wiring
18
is not cured and thus flows into the active area
26
. Accordingly, the sealant flowing into the active area
26
reacts on the liquid crystal to thereby cause a problem in that a stain is generated on the screen.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a liquid crystal display device that is capable of preventing a stain from being generated at the peripherals of liquid crystal injection holes due to a non-curing of a sealant, by changing a shape of signal wiring to prevent a shut-off of an ultraviolet ray irradiated from the rear portion thereof.
In order to achieve these and other objects of the invention, a liquid crystal display device according to one aspect of the present invention includes at least one signal wiring arranged on a substrate provided with liquid crystal injection holes and has a shape indented at an inflow position of a sealant.
A liquid crystal display device according to another aspect of the present invention includes at least one signal wiring arranged on a substrate provided with liquid crystal injection holes and is set to have a smaller width at an inflow position of a sealant.
REFERENCES:
patent: 5858482 (1999-01-01), Ishiwata
patent: 5933209 (1999-08-01), Yonemoto
patent: 6018380 (2000-01-01), Hu et al.
L.G. Philips Co., Ltd.
Long Aldridge & Norman LLP
Ton Toan
LandOfFree
LCD with particular relationship between wirings and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with LCD with particular relationship between wirings and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and LCD with particular relationship between wirings and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2940696