BACK LIGHT

PROBLEM TO BE SOLVED: To improve the front luminance of the back light and to expand the field angle by using as a diffusion film a thermoplastic resin film having a craze and setting the direction of the craze parallel to the cold cathode tube of a side light type back light. SOLUTION: The thermopl...

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Bibliographic Details
Main Author MIZUGUCHI KEIICHI
Format Patent
LanguageEnglish
Published 29.09.1998
Edition6
Subjects
ADVERTISING
BLASTING
CRYPTOGRAPHY
DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING
DISPLAY
DISPLAYING
EDUCATION
FREQUENCY-CHANGING
FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF
HEATING
LABELS OR NAME-PLATES
LIGHTING
MECHANICAL ENGINEERING
NON-LINEAR OPTICS
OPTICAL ANALOGUE/DIGITAL CONVERTERS
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICAL LOGIC ELEMENTS
OPTICS
PHYSICS
SEALS
SIGNS
STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR
TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
WEAPONS
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Summary:PROBLEM TO BE SOLVED: To improve the front luminance of the back light and to expand the field angle by using as a diffusion film a thermoplastic resin film having a craze and setting the direction of the craze parallel to the cold cathode tube of a side light type back light. SOLUTION: The thermoplastic resin film 3 which has the craze 5 is used as the diffusion film and arranged so that the direction of the craze 4 is parallel to the cold cathode tube 1 of the side light type back light. This craze film 3 is obtained by making stress exceeding critical stress operate on an amourphous thermoplastic resin film and then generating the craze at right angles of the operating direction of the stress. This craze film 3 can be manufactured by drawing, so the film can easily be homogeneous and have large area. Light which is projected obliquely from a light guide plate is therefore reflected and diffused by the craze wall surface. Consequently, the quantity of light which is projected on the front is larger than that of scattered light obtained by an embossed film and the field angle can be made wide.
Bibliography:Application Number: JP19970064581