Liquid crystal display having biased bending vertical alignment

Details Liquid crystal display having biased bending vertical alignment Liquid crystal display having biased bending vertical alignment

2002-05-24

2004-10-12

Chowdhury, Tarifur R. (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

C349S143000, C349S144000

Reexamination Certificate

active

06803981

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a liquid crystal display, and more particularly, to a liquid crystal display having biased bending vertical alignment.
BACKGROUND OF THE INVENTION
In the conventional liquid display
1
as shown in
FIG. 1
, the first substrate
10
has a first electrode
11
, the second substrate
30
has a second electrode
31
, and a liquid crystal layer
20
is disposed between the first electrode
11
and the second electrode
31
. The protrusion
12
disposed on the first electrode
11
can divide each pixel area into a plurality of domains. So, each liquid crystal molecules
21
is not vertical but has an angle to the first substrate
10
, called multi-domain vertical alignment (MVA). As such, the view angle of a user is increased.
But the manufacture of the protrusion
12
is difficult so the cost of the conventional display
1
is very high and is easy to malfunction.
The other conventional liquid crystal display
4
is shown in FIG.
2
. The first substrate
40
has a first electrode
41
. The second substrate
60
has a plurality of second electrodes
62
each of which further has sub-electrodes
62
′ divided by the slit
62
a
. A third electrode
63
is disposed under the slit
62
a
so the liquid crystal molecules
51
of the liquid crystal layer
50
is always parallel to the first electrode
41
. And the other liquid molecules
52
have an angle to the first electrode
41
. The second electrode
62
and the third electrode
63
are disposed separately by insulating film
61
.
However, as shown in
FIG. 3
, the liquid crystal molecules
53
far from the third electrode
63
is pointed to the third electrode
63
. But when an electric field is present across between the first and second substrates
40
and
60
, the liquid crystal molecules
51
above the slit
62
a
is tilted and flows along the longitudinal direction of the third electrode
63
first, and after a period of time, the liquid crystal molecules
51
then rotates as the liquid crystal molecules
53
. It causes the slow responding time.
Another problem is that the liquid crystal molecules
52
above the edge
63
′ of the third electrode
63
will rotate suddenly because of the electric field resulting from the overlapping of the second electrode
62
and third electrode
63
. The unstable states of the liquid crystal molecules
52
not only cause the slow responding time but also cause the flicker of the liquid crystal display
4
.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a liquid crystal display having a short responding time.
It is another object of the present invention to provide a liquid crystal with flicker-free.
According to one preferred embodiment of the present invention, a liquid crystal display comprises a first substrate comprising a first electrode; a second substrate which disposing thereon a second electrode having a plurality of sub-electrodes and at least one elongate hole having a longitudinal direction and facing to the first electrode, a third electrode positioned under the at least one hole and between the second electrode and the second substrate, connected to a gate electrode or an independent electrode, and having at least one notch disposed on an edge thereof and a longitudinal direction perpendicular to the longitudinal direction of the elongate hole; a liquid crystal layer comprising a plurality of liquid crystal molecules and interposed between the first substrate and the second substrate; then the liquid crystal molecules above and in a vicinity to the hole are aligned to the longitudinal direction of the hole, and the liquid crystal molecules above and in a vicinity to the notch are pointed to a valley of the notch in a present of sufficient electric field across the first substrate and the second substrate.
The liquid crystal molecules in the liquid crystals display preferably are negative dielectric anisotropy material.
Certainly, the second electrode can be further divided to a plurality of sub-electrodes by a plurality of slits.
Certainly, the second electrode can further comprise a plurality of gaps aligned said slit and pointed to said third electrode.
The switching element preferably further connects to said second electrode.
The first electrode is preferably made of a transparent material.
The second electrode is preferably made of a transparent material.
The third electrode is preferably made of a non-transparent material.
The third electrode is preferably connected to a gate electrode.
The third electrode is preferably connected to an independent electrode.
The second electrode is preferably connected to a switching element.
In accordance with another aspect of the present invention, a liquid crystal display comprises a first substrate comprising a first electrode, a second substrate comprising a second electrode having at least one elongate hole having a longitudinal direction and facing to the first electrode, the second substrate further comprising a third electrode positioned under the at least one hole, and a liquid crystal layer comprising a plurality of liquid crystal molecules and interposed between the first substrate and the second substrate, wherein the liquid crystal molecules above and in a vicinity to the hole are aligned to the longitudinal direction of the hole in a presented of a sufficient electric field across the first substrate and the second substrate.
Preferably the second substrate further comprises a switching element electrically connected to the second electrode.
The second electrode preferably has at least one sub-electrode.


REFERENCES:
patent: 5136407 (1992-08-01), Clerc
patent: 5886762 (1999-03-01), Lee et al.
patent: 6157428 (2000-12-01), Koma
patent: 2003/0107695 (2003-06-01), Kubo et al.

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