Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
2002-09-27
2003-05-27
Kim, Robert H. (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C349S122000, C349S124000, C349S129000
Reexamination Certificate
active
06570635
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a liquid crystal display device and a manufacturing method therefor and particularly to a liquid crystal display device having a wide range of viewing angle and a method of manufacturing the same.
2. Description of the Prior Art
In general, liquid crystal display devices have been used as display devices for various electronic equipment, etc. because they can be manufactured to be thin in thickness and light in weight. However, the liquid crystal display device has a disadvantage that the viewing angle thereof is narrower than CRT. Therefore, a technique for widening the viewing angle of the liquid crystal display device has been hitherto proposed.
FIG. 10
is a perspective view showing a conventional liquid crystal display device disclosed in Japanese Patent Laid-open Publication No. 7-199193. In the conventional liquid crystal display device, uneven surface
52
is provided at each pixel
51
on one substrate
56
or both substrates
56
,
57
.
FIG. 10
shows a case where uneven surfaces
52
are provided on the substrate
56
. Upon applying a voltage between the substrates
56
and
57
, the rise-up direction of liquid crystal molecules
53
between the substrates
56
and
57
is determined by an angle which is dependent on the surface structure of the substrate
56
, whereby areas
54
and
55
having different orientation directions are provided at the voltage application time and the visual characteristic is compensated between the respective areas
54
and
55
. Therefore, a liquid crystal display device having a wide range of viewing angle can be obtained.
FIGS. 11A
to
11
D are cross-sectional views showing a series of steps of a method of manufacturing a substrate used for the above conventional liquid crystal display device.
First, thermoplastic resist
61
is coated on substrate
60
with electrodes (FIG.
11
A).
Subsequently, the resist
61
is partially shielded and then exposed to light to dissolve and remove undesired portions of the resist, whereby resist
61
a
remains in a partial area (FIG.
11
B).
Subsequently, the substrate
60
is heated to deform the resist
61
a
, thereby forming resist
61
b
having an uneven structure surface respectively (FIG.
11
C).
However, the conventional liquid crystal display device described above has a disadvantage that it has lower transparency as compared with similar organic materials having no photosensitive group because a photosensitive resist is used even when the whole-surface light exposure is performed, so that a display image is darkened or colored.
Furthermore, it is described in the above publication that according to the method of manufacturing the substrate used in the above conventional liquid crystal display device, slant and uneven portions are formed in a wide range by deforming the thermoplastic resist. However, the thermoplastic resist is actually deformed at only the end portions of the residual resist like the resist
61
c
, and it is difficult to form the slant and uneven portions in a wide range (FIG.
11
D). Accordingly, the conventional liquid crystal display device has a disadvantage that a regulation force is insufficient to keep the uniform rise-up direction and thus a stable orientation state cannot be obtained.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a liquid crystal display device having a wide range of viewing angle characteristic with which transparency is enhanced and a stable orientation state can be obtained, and a method of manufacturing the liquid crystal display device.
In order to attain the above object, according to a first aspect of the present invention, a liquid crystal display device having a pair of substrates and a liquid crystal layer disposed therebetween, is characterized in that orientation control slope portions composed of an organic film are provided on at least one of the substrates so as to be slopewise formed in different directions within each pixel, and an opaque shielding electrode is disposed at a boundary portion at which the slope direction is varied in each of the orientation control slope portions.
According to a second aspect of the present invention, a liquid crystal display device having a first substrate, a second substrate and a liquid crystal layer disposed between the first substrate and the second substrate, is characterized in that the first substrate comprises a first transparent substrate, first transparent electrodes provided on the first transparent substrate, orientation control slope portions which are slopewise formed in different directions within each pixel and composed of organic film and provided on the first transparent electrodes and a first orientation layer coated on the orientation control slope portions, the second substrate comprises a second transparent substrate, one or more second transparent electrodes provided on the second transparent substrate and a second orientation layer coated on the one or more second transparent electrodes, and an opaque shielding electrode is disposed a boundary portion at which the slope direction is varied in each of the orientation control slope portions.
According to a third aspect of the present invention, a liquid crystal display device having a first substrate, a second substrate and a liquid crystal layer disposed between the first substrate and the second substrate, is characterized in that the first substrate comprises a first transparent substrate, pixel electrodes provided on the first transparent substrate, first orientation control slope portions which are slopewise formed in different directions within each pixel and composed of organic film and provided on the pixel electrodes, and a first orientation layer coated on the first orientation control slope portions, the second substrate comprises a second transparent substrate, one or more opposite electrodes provided on the second transparent substrate, a second orientation control slope portions which are slopewise formed in different directions within each pixel and composed of organic film and provided on the one or more opposite electrodes, and a second orientation layer coated on the second orientation control slope portions, the first and second orientation control slope portions being formed so that the confronting surfaces thereof are substantially parallel to each other, and an opaque shielding electrode is disposed at a boundary portion at which the slope direction is varied in each of the first orientation control slope portions.
According to a fourth aspect of the present invention, a liquid crystal display device having a first substrate, a second substrate and a liquid crystal layer disposed between the first substrate and the second substrate, is characterized in that the first substrate comprises a first transparent substrate, pixel electrodes provided on the first transparent substrate, first orientation control slope portions which are slopewise formed in different directions within each pixel and composed of organic film and provided on the pixel electrodes, and a first orientation layer coated on the first orientation control slope portions, the second substrate comprises a second transparent substrate, one or more opposite electrodes provided on the second transparent substrate, a second orientation control slope portions which are slopewise formed in different directions within each pixel and composed of organic film and provided on the one or more opposite electrodes, and a second orientation layer coated on the second orientation control slope portions, the first and second orientation control slope portions being formed so that the confronting surfaces thereof are substantially parallel to each other, and an opaque shielding electrode is disposed at a boundary portion at which the slope direction is varied in each of the second orientation control slope portions.
According to a fifth aspect of the present invention, a liquid crystal display device having a pair of substrates and a liquid cr
Chung David
Foley & Lardner
Kim Robert H.
NEC Corporation
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