COMPOSITE LIGHT GUIDE PLATE

PROBLEM TO BE SOLVED: To provide a composite light guide plate having a thickness of more than about 1 mm, for use in LCD backlights or in general illumination devices.SOLUTION: An extrusion roll molding process is combined with a coating step and a lamination step to enable a cost effective roll-to...

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Bibliographische Detailangaben
Hauptverfasser:	JEHUDAH GREENER, BOMBA RICHARD D, HERRON LAY, MICHAEL R LAUNDRY
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING 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 FREQUENCY-CHANGING HEATING INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21Sand F21V, RELATING TO THEFORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THELIGHT EMITTED LIGHTING MECHANICAL ENGINEERING NON-LINEAR OPTICS NON-PORTABLE LIGHTING DEVICES OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS SYSTEMS THEREOF TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a composite light guide plate having a thickness of more than about 1 mm, for use in LCD backlights or in general illumination devices.SOLUTION: An extrusion roll molding process is combined with a coating step and a lamination step to enable a cost effective roll-to-roll or roll-to-sheet manufacture of a thick composite light guide plate. One or both of principal surfaces of the light guide plate contain a pattern to enable extraction and redirection of light by the light guide plate from a light source or multiple light sources placed at one or multiple edges of the light guide plate. The composite light guide plate comprises a patterned film 410 and a pre-cut sheet 515 joined together by an adhesive layer 505. In order to attain good light extraction efficiency, the adhesive layer 505 and two constituent layers of the light guide plate must be optically matched such that the refractive indices of any two of three materials of the composite light guide plate can differ by no more than 0.01.