Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Patent
1998-05-27
2000-11-14
Sikes, William L.
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
349115, 359599, G02F 11335
Patent
active
061477338
DESCRIPTION:
BRIEF SUMMARY
This application claims the priority of Japanese Patent Application No. Heisei 8-215523, filed Jul. 26, 1996, Japanese Patent Application No. Heisei 9-98528, filed Mar. 31, 1997, Japanese Patent Application No. Heisei 9-98529, filed Mar. 31, 1997, and Japanese Patent Application No. Heisei 9-98532, filed Mar. 31, 1997 which are incorporated herein by reference.
TECHNICAL FIELD
The present invention relates to a diffusing film and a liquid crystal display element, and in particular, relates to an improvement of its color tone.
BACKGROUND ART
In recent years, a liquid crystal display element is used in various fields, and in particular, is largely used in a field of electronic industries such as a notebook personal computer, portable liquid crystal television, and the like, since the liquid crystal display element is thin-type and lightweight. This liquid crystal display element indicates image by controlling light transmission/shielding from an external light or back lighting (internal light source) by means of a liquid crystal shutter, since the liquid crystal display element does not emit light in itself unlike a plasma display. Namely, in a liquid crystal display element, a diffusing film, which is to provide a light in uniformly to an entire liquid crystal panel, is inserted into the backside of a liquid crystal panel in general. A reflective film that has high diffused reflectance is used in the liquid crystal display which uses an external light. The reflective film scatters and reflects the external light which is entered from the obverse side of the liquid crystal panel and returns to the liquid crystal panel. The display indicates image by controlling transmission/shielding by means of a liquid crystal shutter. While a diffusing film that has high diffused transmittance is used in the liquid crystal display which uses a back lighting. The diffusing film diffuses and transmits the internal light from the reverse side of a liquid crystal panel and provides a light to the liquid crystal panel. Transmission/shielding of light is controlled by means of the liquid crystal shutter. Further, a semitransmissive diffusing film which properly uses the external light and the back lighting according to ON/OFF of the back lighting, also can be used.
Conventionally, as for a technique regarding a transmissive diffusing film which diffuses a light flux from a back lighting, the technique mentioned in Japanese Unexamined Patent Publication No. Sho 57-88401 is known. Also, as for a technique for complementing a color tone, the technique mentioned in Japanese Unexamined Patent Publication No. Sho 60- 250382 is known.
A transmissive diffusing film mentioned in said Japanese Unexamined Patent Publication No. Sho 57-88401 comprises one pearly pigment and diffuses a light flux from a back lighting by this pearly pigment.
On the other hand, in addition to said pearly pigment, a polarizer disclosed in said Japanese Unexamined Patent Publication No. Sho 60-250382 further comprises fluorescent dye, blue dye and the like. A color tone is obtained by absorbing an optical component which has a specific wavelength among a light flux from the back lighting, to dye.
However, the light transmittance in the case where white light was entered, was low in short wave range as compared with long wave range, in the diffusing film mentioned in said Japanese Unexamined Patent Publication No. Sho 57-88401, as shown in FIG. 1a. Therefore, a color tone of a transmitted light in a diffusing film became dark liver brown and satisfactory color tone and lightness could not be obtained even when this diffusing film was used for a liquid crystal display element.
Also, a polarizing film mentioned in said Japanese Unexamined Patent Publication No. Sho 60-250382 is exemplified as for a technique to complement an inferiority of color tone. However, an incident light from a back lighting was not effectively used since an optical component which has a specific wavelength among the incident light from the back lighting was absorbed by dye. According
Kimura Asa
Miyamoto Tsuyoshi
Shiseido Co. Ltd.
Sikes William L.
Snider Ronald R.
Ton Toan
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