Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Making named article
Reexamination Certificate
2000-12-05
2002-01-01
McPherson, John A. (Department: 1756)
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Making named article
C430S330000, C349S113000
Reexamination Certificate
active
06335150
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is related to a manufacturing method for reflecting panel of reflective liquid crystal display, in which the exposure time or developing/etching time is controlled to achieve insufficient exposure or incomplete development for creating small etching depth.
FIGS. 5A
to
7
show the manufacturing method for a reflecting panel of a conventional liquid crystal display. The reflecting panel
8
of the such liquid crystal display includes a substrate board
81
which is sprayed with photoresistor
82
and preheated. Then the reflecting panel
8
is covered by a photomask
9
and exposed. Then a developer is used to develop the exposed section or not exposed section so as to form multiple protuberance
83
on the photoresistor
82
. Then the semiproduct of reflecting panel
8
is placed upright and heat-treated to soften the protuberances
83
and round the surface thereof. Finally, a metal film
84
is precipitated onto the reflecting panel
8
to naturally form multiple deformed sections
841
and multiple bottom faces
842
. The deformed section
841
has an asymmetrical section. Light beam is reflected by the deformed section
841
at a predetermined angle.
The photoresistor
82
of the reflecting panel
8
of the liquid crystal display is etched by an etchant. However, the etching depth is very small. Therefore, in heat-treatment, it is hardly apparent to make the protuberances
83
flow downward due to gravity and it is difficult to achieve a desired deformation amount of the deformed section
841
. In
FIG. 5
, the substrate board
81
is tilted to help in making the asymmetrical section. However, the shape of the deformed section
841
is hard to control. Moreover, the photoresistor is thoroughly etched downward to the substrate board
81
. After the metal film
84
is precipitated, the bottom faces
842
are polished faces which totally reflect the light. As a result, the reflected light is very strong and glare. A human eye can hardly stare the panel for a long time and clearly see the picture shown by the display.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide a manufacturing method for reflecting panel of reflective liquid crystal display. The exposure time or developing/etching time for the photoresistor of the reflecting panel is controlled to achieve insufficient exposure or incomplete development/etching. The etched bottom faces have irregular roughness for scattering light beam and controlling strength of the reflected light as well as reduce glare. Therefore, the display can display clearer pictures.
The present invention can be best understood through the following description and accompanying drawings wherein:
REFERENCES:
patent: 5204765 (1993-04-01), Mitsui et al.
patent: 6097458 (2000-08-01), Tsuda et al.
patent: 6163353 (2000-12-01), Ting
patent: 6181397 (2001-06-01), Ichimura
patent: 2000-171794 (2000-06-01), None
McPherson John A.
Rosenberg , Klein & Lee
Wintek Corporation
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