Radiation imagery chemistry: process – composition – or product th – Post imaging processing – Physical developing
Patent
1987-07-17
1988-10-11
Arnold, Bruce Y.
Radiation imagery chemistry: process, composition, or product th
Post imaging processing
Physical developing
350339F, 430 7, G02B 520, G02F 1133, H01M 1400
Patent
active
047766719
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a color filter for use in various types of display devices and a method for manufacturing the same. More particularly, the invention relates to a high property, high precision color filter for use in liquid crystal display devices and the like having color display capability and a method for manufacturing the same.
BACKGROUND ART
Various kinds of color filters for display devices have been known in the art, but as typical examples there of, color filters for liquid crystal display devices are taken up for discussion herein.
Liquid crystal display devices are widely used for digital display in electronic calculators and clocks and for analog display in measuring devices, instrumentation, household appliances, and audio equipment. Recently, needs have been increasing for incorporation of color display capability into such display devices, particularly in such applications as peripheral terminal displays in various kinds of equipment, mounted display, telephone display, and TV image display. In attempts to meet said needs, various liquid crystal color display devices have been proposed, some of .hiwch are now being put in practical application. However, none of the color display systems for liquid crystal display devices so far proposed have been successful in meeting the user's needs.
One known type of color filter applicable to liquid crystal display devices having color display capability is such that a transparent substrate has gelatin layers formed in the interior thereof, the gelatin layers being colored by the photolithography technique in different colors, one layer after another.
Any color filter produced by such technique, however, involves the following difficulties. That is, (a) it lacks evenness: since gelatin layers in different colors are laid one over another, level unevenness is likely to be produced; (b) it lacks heat resistance and, therefore, a crack is likely to be caused in the color filter by heating when a transparent conductive film is formed by deposition on the filter. If the deposition step is carried out at a low temperature in order to avoid aforesaid difficulty of cracking, the transparent conductive film is likely to show an increased resistance or allow less transmission of light. And (c) such color filter lacks water resistance, whereby washing the filter with an aqueous solution becomes difficult, it being thus likely that the display performance quality of the liquid crystal is deteriorated by stains. Further, (d) the color filter lacks resistance to weathering, and (e) the manufacturing process for it is complicated. For these reasons, color filters produced by the photolithography method have not satisfactorily met user's needs.
Another construction of a color filter of the type is known which incorporates aluminum oxide layers. For example, one such color filter comprises aluminum oxide anode layers formed in the interior of a transparent substrate, the anode layers being colored (Japanese Published Unexamined Patent Application Nos. 53-99822 and 53-110379), and another comprises porous layers formed by deposition on the interior of a transparent substrate, the porous layers each having a coloring material deposited thereon (Japanese Published Unexamined Patent Application No. 55-166607).
However, these color filters have critical drawbacks in that (a) they have no transparency and that (b) they have poor dye affinity. Therefore, neither of them has been put into practical application.
In view of these facts, the present inventors made extensive studies in an attempt to overcome the difficulties with color filters produced by aforesaid photolithography technique and to provide a color filter which could be put to practical use. As a result, they developed, as their previous invention, a color filter comprising active film layers formed of a colloidal alumina and a colloidal silica, the film layers being dyed (see Japanese Patent Application No. 59-97210, laid open to public inspection on Dec. 14, 1986 under Japanese Pu
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Hiratani Tenri
Inako Yoshihide
Nishida Masahiro
Sumi Takao
Arnold Bruce Y.
Callaghan Terry S.
Nissha Printing Co. Ltd.
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