OPTICAL SHEET, BACKLIGHT UNIT, AND LIQUID CRYSTAL DISPLAY DEVICE

• Main Author: SAKAKI YUICHI
• Format: Patent
• Language: English
• Published: 22.04.2013
• Subjects: 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; PHYSICS; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; SYSTEMS THEREOF; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

PROBLEM TO BE SOLVED: To provide an optical sheet capable of controlling luminous unevenness peculiar to a light guide plate in a direction where the luminous unevenness is compensated, and having contact resistance and abrasion resistance.SOLUTION: In the optical sheet, columnar prism lenses of which the cross-sectional shape is an isosceles triangle are arranged in a stripe form so that an arrangement pitch may become a bottom length of the isosceles triangle, and moreover, two or more semispherical lenses are arranged on the prism lenses. The height of the semispherical lens is higher than the prism lens and a vertex angle of the prism lens is within a range of 90°to 120°.