# US 9,039,222 B2 · Backlight module with light-guiding portions > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,039,222 B2 - Document ID: US9039222B2 - Status: Granted - Kind: B2 - Application number: 13/926,084 - Filed: 2013-06-25 - Published: 2014-03-06 - Granted: 2015-05-26 - Earliest claimed: 2012-09-04 - Assignees: Advanced Optoelectronic Technology, Inc. - Applicants: Advanced Optoelectronic Technology, Inc. - Inventors: Chao-Hsiung Chang; Pin-Chuan Chen; Li-Hsiang Chen - Web page: https://patentgrep.com/patent/US9039222B2 ## CPC - G02B 6/0011: {the light guides being planar or of plate-like form} - F21V 5/00: Refractors for light sources (characterised by cooling arrangements F21V29/504) - G02F 1/133603: {with LEDs} - G02F 1/133606: {including a specially adapted diffusing, scattering or light controlling members} - G02B 19/0061: {the light source comprising a LED} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS ## Abstract A backlight module includes a substrate, a plurality of LED packages mounted on the substrate and a light diffusion board located above the LED packages. The light diffusion board includes a light incident surface facing toward the LED packages and a light output surface. A plurality of light-guiding portions is configured extending from the incident surface of the light diffusion board toward the LED package. Each light-guiding portion comprises a concave surface at an outer periphery thereof. A diameter of each light-guiding portion decreases gradually from light diffusion board toward the LED packages. The concave surface of each light-guiding portion is recessed inwardly from the outer periphery of the light-guiding portion. Light from the LED packages and emitting into the light-guiding potions is divergently and uniformly adjusted into the light diffusion board by the concave surfaces of the light-guiding portions. ## Claims ### Claim 1 A backlight module comprising: a substrate; a plurality of separate light emitting diode (LED) packages mounted on the substrate; and a light diffusion board located above the LED packages, the light diffusion board comprising a light incident surface oriented toward the LED packages and a light outputting surface opposite to the light incident surface, a plurality of light-guiding portions being configured extending from the incident surface of the light diffusion board, the light-guiding portions facing toward and aligned with the LED packages, respectively, each light-guiding portion comprising a concave surface, light emitting into the light-guiding portions being divergently refracted by the concave surfaces of the light-guiding portions into the light diffusion board; wherein each light-guiding portion is funnel shaped, and a diameter of the light-guiding portion is decreasing gradually from a top end connecting the light diffusion board to a bottom end facing toward a corresponding LED package. ### Claim 2 (depends on 1) The backlight module of claim 1, wherein the concave surface is recessed inwardly from an outer periphery of the light-guiding portion. ### Claim 3 (depends on 2) The backlight module of claim 2, wherein a curvature of the concave surface is varied from 0.5 mm-1 to 1.5 mm-1. ### Claim 4 (depends on 1) The backlight module of claim 1, wherein a light diffusion film is coated on the light output surface of the light diffusion board. ### Claim 5 (depends on 1) The backlight module of claim 1 further comprising covers covering the LED packages respectively, wherein each cover defines a cavity therein, and the cavity receives a corresponding LED therein. ### Claim 6 (depends on 5) The backlight module of claim 5, wherein light emitted from the corresponding LED package and into an inner surface of each cover defining the cavity is refracted divergently by the inner surface into the light diffusion board. ### Claim 7 (depends on 6) The backlight module of claim 6, wherein the cavity is arc-shaped, and is recessed from a bottom surface connecting the substrate toward a top surface far away from the substrate. ### Claim 8 (depends on 6) The backlight module of claim 6, wherein the distance between the LED chip and the light incident surface of the light diffusion board is 30 millimeters. ### Claim 9 (depends on 5) The backlight module of claim 5, wherein optical lenses are located on the covers respectively, light emitted from each cover and into a corresponding optical lens is refracted divergently by the corresponding optical lens into the light diffusion board. ### Claim 10 (depends on 9) The backlight module of claim 9, wherein each optical lens comprises a main body and a light-diverging part formed on a top end of the main body, and light emitted into the optical lens is refracted divergently into the light diffusion board by the light-diverging part. ### Claim 11 (depends on 10) The backlight module of claim 10, wherein each light-diverging part comprises a plurality of circular protruding portions radiating outwardly from a center of a corresponding optical lens. ### Claim 12 (depends on 11) The backlight module of claim 11, wherein each light-diverging part comprise a first surface perpendicular to the main body of the light-diverging part and a second surface inclined downwardly from a top of the first surface toward the main body. ### Claim 13 (depends on 12) The backlight module of claim 12, wherein the second surface is inclined inwardly from the top of the first surface toward the center of the corresponding optical lens. ### Claim 14 (depends on 9) The backlight module of claim 9, wherein each optical lens is a Fresnel lens. ### Claim 15 (depends on 5) The backlight module of claim 5, wherein each LED package comprises a metal base mounted on the substrate and an LED chip arranged on the metal base, and a distance between the LED chip and the light incident surface of the light diffusion board is varied from 15 millimeters to 40 millimeters. ### Claim 16 A backlight module comprising: a substrate; a plurality of separate light emitting diode (LED) packages mounted on the substrate; and a light diffusion board located above the LED packages, the light diffusion board comprising a light incident surface oriented toward the LED packages and a light outputting surface opposite to the light incident surface, a plurality of light-guiding portions being configured extending from the incident surface of the light diffusion board, the light-guiding portions facing toward and aligned with the LED packages, respectively, each light-guiding portion comprising a concave surface, light emitting into the light-guiding portions being divergently refracted by the concave surfaces of the light-guiding portions into the light diffusion board; wherein the concave surface is recessed inwardly from an outer periphery of the light-guiding portion; wherein a curvature of the concave surface is varied from 0.5 mm-1 to 1.5 mm-1; wherein each light-guiding portion is funnel shaped, and a diameter of the light-guiding portion is decreasing gradually from a top end connecting the light diffusion board to a bottom end facing toward a corresponding LED package; and wherein the backlight module further comprising covers covering the LED packages respectively, each cover defines a cavity therein, and the cavity receives a corresponding LED therein.