BACKLIGHT MODULE AND ITS LENS

• Main Author: WU MENGAI
• Format: Patent
• Language: English
• Published: 27.07.2006
• 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; 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; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; WEAPONS

PROBLEM TO BE SOLVED: To provide a backlight module keeping a uniform screen brightness. SOLUTION: The lens 21 has a light-transmitting surface 211 at the bottom. Cross-section of the light-transmitting surface 211 is concave. A light-reflecting surface 212 adjacent to the light-transmitting surface 211 contains a front reflective layer 215 and a back reflective layer 216. Cross-section of the light-reflecting surface 212 is concave. A side surface 213 is translucent or transparent, which connects the light-reflecting surface 212 and the light-transmitting surface 211 with its position inclined. A diffusion surface 214 with a convex profile is formed on a medial axis of the light-reflecting surface. The light-transmitting surface 211 has a space 217 to accommodate a light source at its center. COPYRIGHT: (C)2006,JPO&NCIPI