MANUFACTURING METHOD FOR OPTICAL SHEET, LIGHT SOURCE UNIT INCLUDING THE OPTICAL SHEET, AND DISPLAY DEVICE

PROBLEM TO BE SOLVED: To provide a manufacturing method for an optical sheet by which a first optical sheet having a variety of surface shapes and optical characteristics can be manufactured from one shaping roll, because reduction in the cost and thickness is requested for a display device using a...

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Bibliographische Detailangaben
Hauptverfasser:	MATSUKAWA KENJI, AWAJI TOSHIO
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 FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF 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 PERFORMING OPERATIONS PHYSICS PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR SYSTEMS THEREOF TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF TRANSPORTING VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS WEAPONS WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a manufacturing method for an optical sheet by which a first optical sheet having a variety of surface shapes and optical characteristics can be manufactured from one shaping roll, because reduction in the cost and thickness is requested for a display device using a directly-below type light source unit. SOLUTION: In the method for manufacturing a first optical sheet, an optical sheet base material formed with cylindrical optical elements on the light-emitting surface with a pitch P of 200 μm or less, a height H of 200 μm or less, and an H/P value of 0.1 to 0.9 is stretched under the following condition: 100×(¾A-B¾)/((A+B)/2)≤10, wherein A is the brightness at a point directly above cold-cathode tube lamps on the optical sheet closest to a front panel, and B is the brightness at a center point of adjacent cold-cathode tube lamps on the optical sheet, when 2d