# US 9,519,094 B2 · Backlight module and the liquid crystal display > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,519,094 B2 - Document ID: US9519094B2 - Status: Granted - Kind: B2 - Application number: 13/980,064 - Filed: 2013-06-27 - Published: 2014-11-27 - Granted: 2016-12-13 - Earliest claimed: 2013-05-23 - Assignees: Shenzhen China Star Optoelectronics Technology Co., Ltd. - Applicants: Shenzhen China Star Optoelectronics Technology Co., Ltd. - Inventors: Yongyuan Qiu; Yong Fan - Web page: https://patentgrep.com/patent/US9519094B2 ## CPC - G02B 6/0028: {Light guide, e.g. taper} - G02B 6/0008: {the light being emitted at the end of the fibre} - G02B 6/262: {Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A backlight module is disclosed. The backlight module includes an ambient light collector for collecting ambient lights, at least one optical fiber connecting to the ambient light collector, a light emitting plate arranged closely to an optical plate, at least one fixing sleeve being received in the through hole, and at least one optical fiber sleeve. The light emitting plate includes a plurality of through holes. The optical fiber sleeve is fixed within the fixing sleeve and engages with the light emitting ends of the optical fibers to fix the optical fibers on the light emitting plate. The backlight module utilizes the ambient lights as light source. In addition, by cutting the light emitting end of the optical fibers, the light emitting angle of the lights are greatly enlarged. As such, the brightness difference is decreased and the display performance is enhanced. ## Claims ### Claim 1 A backlight module, comprising: an ambient light collector for collecting ambient lights; at least one optical fiber connecting to the ambient light collector, the optical fiber comprises a core, a clad layer, and a coating layer, the coating layer is a polymer coating layer, and light emitting ends of the optical fiber are cut to enlarge light emitting angles, wherein the light emitting end of the optical fiber is substantially wedge-shaped or truncated conical-shape, wherein the light emitting end comprises two slopes symmetric to each other with respect to a central axis of the optical fiber, and two short sides of the light emitting surface are arc-shaped; a light emitting plate arranged closely to an optical plate, and the light emitting plate comprises a plurality of through holes; at least one fixing sleeve being received in the through hole; and at least one optical fiber sleeve being fixed within the fixing sleeve and engaging with the light emitting ends of the optical fibers so as to fix the optical fibers on the light emitting plate, wherein the optical fiber sleeve comprises a sleeve portion and an engaging portion, an internal diameter of the engaging portion gradually decreases along a direction from a connecting portion of the sleeve portion and the engaging portion toward an outlet of the engaging portion; and the light emitting angle of the light emitting surface of the optical fiber satisfying the equation: β=(2n+1)θ+α; wherein β indicates the light emitting angle of the light emitting surface of the optical fiber, θ indicates the angle between the slope with respect to the central axis of the optical fiber and a horizontal plane of the optical fiber, α indicates the angle between the slope and a direction of a light ray from an internal direction of the optical fiber upon the light emitting end, and n indicates a number of perfect reflections of the light ray upon the slope. ### Claim 2 (depends on 1) The backlight module as claimed in claim 1, wherein an outer wall of the fixing sleeve engages with the through holes by welding. ### Claim 3 (depends on 1) The backlight module as claimed in claim 1, wherein an outer wall of the fixing sleeve engages with the through holes by adhesive. ### Claim 4 (depends on 1) The backlight module as claimed in claim 1, wherein an internal diameter of the sleeve portion is the same with the diameter of the optical fiber, the engaging portion engages with the light emitting end of the optical fiber, and the sleeve portion is attached on the optical fibers. ### Claim 5 (depends on 4) The backlight module as claimed in claim 4, wherein the sleeve portion is attached on the optical fibers by adhesive. ### Claim 6 (depends on 1) The backlight module as claimed in claim 1, wherein an inner surface of the fixing sleeve comprises internal thread, and an outer surface of the sleeve portion comprises outside thread, the fixing sleeve engages with the sleeve portion by the internal thread and the outside thread so as to fix the fixing sleeve and the sleeve portion of the optical fiber sleeve. ### Claim 7 (depends on 1) The backlight module as claimed in claim 1, wherein the optical plate is a light guiding plate. ### Claim 8 (depends on 1) The backlight module as claimed in claim 1, wherein the optical plate is a diffusion plate. ### Claim 9 A liquid crystal display, comprising: a backlight module and a liquid crystal panel opposite to the backlight module, the backlight module provides a light source to the liquid crystal panel, and the backlight module comprises: an ambient light collector for collecting ambient lights; at least one optical fiber connecting to the ambient light collector, the optical fiber comprises a core, a clad layer, and a coating layer, the coating layer is a polymer coating layer, and light emitting ends of the optical fiber are cut to enlarge light emitting angles, wherein the light emitting end of the optical fiber is substantially wedge-shaped or truncated conical-shape, wherein the light emitting end comprises two slopes symmetric to each other with respect to a central axis of the optical fiber, and two short sides of the light emitting surface are arc-shaped; a light emitting plate arranged closely to an optical plate, and the light emitting plate comprises a plurality of through holes; at least one fixing sleeve being received in the through hole; and at least one optical fiber sleeve being fixed within the fixing sleeve and engaging with the light emitting ends of the optical fibers so as to fix the optical fibers on the light emitting plate, wherein the optical fiber sleeve comprises a sleeve portion and an engaging portion, an internal diameter of the engaging portion gradually decreases along a direction from a connecting portion of the sleeve portion and the engaging portion toward an outlet of the engaging portion; and the light emitting angle of the light emitting surface of the optical fiber satisfying the equation: β=(2n+1)θ+α; wherein β indicates the light emitting angle of the light emitting surface of the optical fiber, θ indicates the angle between the slope with respect to the central axis of the optical fiber and a horizontal plane of the optical fiber, α indicates the angle between the slope and a direction of a light ray from an internal direction of the optical fiber upon the light emitting end, and n indicates a number of perfect reflections of the light ray upon the slope. ### Claim 10 (depends on 9) The liquid crystal display as claimed in claim 9, wherein an outer wall of the fixing sleeve engages with the through holes by welding. ### Claim 11 (depends on 9) The liquid crystal display as claimed in claim 9, wherein an outer wall of the fixing sleeve engages with the through holes by adhesive. ### Claim 12 (depends on 9) The liquid crystal display as claimed in claim 9, wherein an internal diameter of the sleeve portion is the same with the diameter of the optical fiber, the engaging portion engages with the light emitting end of the optical fiber, and the sleeve portion is attached on the optical fibers. ### Claim 13 (depends on 12) The liquid crystal display as claimed in claim 12, wherein the sleeve portion is attached on the optical fibers by adhesive. ### Claim 14 (depends on 9) The liquid crystal display as claimed in claim 9, wherein an inner surface of the fixing sleeve comprises internal thread, and an outer surface of the sleeve portion comprises outside thread, the fixing sleeve engages with the sleeve portion by the internal thread and the outside thread so as to fix the fixing sleeve and the sleeve portion of the optical fiber sleeve. ### Claim 15 (depends on 9) The liquid crystal display as claimed in claim 9, wherein the optical plate is a light guiding plate. ### Claim 16 (depends on 9) The liquid crystal display as claimed in claim 9, wherein the optical plate is a diffusion plate.