# US 9,435,928 B2 · Light guiding system, edge-lighting backlight module and LCD device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,435,928 B2 - Document ID: US9435928B2 - Status: Granted - Kind: B2 - Application number: 13/819,342 - Filed: 2013-01-17 - Published: 2015-10-15 - Granted: 2016-09-06 - Earliest claimed: 2013-01-16 - Assignees: Shenzhen China Star Optoelectronics Technology Co., Ltd. - Applicants: Shenzhen China Star Optoelectronics Technology Co., Ltd. - Inventors: Che-chang Hu; Kuang-yao Chang; Chao Ning; Yong Fan - Web page: https://patentgrep.com/patent/US9435928B2 ## CPC - G02B 6/0028: {Light guide, e.g. taper} - G02B 6/0066: {characterised by the light source being coupled to the light guide} - G02B 6/0031: {Reflecting element, sheet or layer} - G02B 6/0035: {provided on the surface of the light guide or in the bulk of it} - G02B 6/0055: {Reflecting element, sheet or layer} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A light guiding system includes an ambient light gathering system, multiple light guiding devices and a wedge light guiding bar. The ambient light gathering system facing ambient light is used for absorbing the ambient light. Each light guiding device absorbs the absorbed light. The wedge light guiding bar has a light-out surface and a light-in surface coupled to the light-out surface. The light-in surface is a wide surface coupled to an inclined surface. The light-out surface is opposite to the inclined surface and next to a light-in side of a light guide plate. The wedge light guiding bar for use in the light guiding system, an edge-lighting backlight module and an LCD device can reduce cost of material and weight. Also, the light uniformity of the light output end is improved and the optical quality of the edge-lighting backlight module is raised. ## Claims ### Claim 1 A light guiding system for use in an edge-lighting backlight module comprising: an ambient light gathering system, facing to ambient light, for absorbing the ambient light to generate absorbed light; a plurality of light guiding devices, each light guiding device having a light input end and a light output end near to the ambient light gathering system, and the absorbed light from the light input end being guided to the light output end; and a wedge light guiding bar having a light-out surface, a light-in surface, an inclined surface, and a first surface, wherein the light-out surface is connected to the light-in surface, the inclined surface is a single surface remaining a specific angle, is adjacent to and directly connected between the first surface and light-in surface, and is opposite to the light-out surface, and the light-in surface is wider than the first surface and is near the light out end of the plurality of light guiding devices, wherein a plurality of cylindrical nodes are set up on the inclined surface and protrude from the inclined surface; wherein the plurality of cylindrical nodes are arranged to scatter light from the light-in surface so as to make the light from the light-out surface more even. ### Claim 2 (depends on 1) The light guiding system of claim 1, wherein the light guiding device is an optical fiber. ### Claim 3 (depends on 1) The light guiding system of claim 1, wherein reflectors are disposed on the inclined surface, a narrow surface opposite to the light-in surface, a bottom surface coupled to the inclined surface and a top surface opposite to the bottom surface. ### Claim 4 (depends on 1) The light guiding system of claim 1, wherein a plurality of semisphere nodes are set up on the inclined surface. ### Claim 5 (depends on 1) The light guiding system of claim 1, wherein the wedge light guiding bar is made of polymethyl methacrylate (PMMA). ### Claim 6 An edge-lighting backlight module comprising: a light guide plate, comprising a light-in side, a bottom side and a light-out side being opposite to each other and coupled to the light-in side; a back bezel, disposed under the bottom side; an optical film, disposed over the light-out side; and a light guiding system comprising: an ambient light gathering system, facing to ambient light, for absorbing the ambient light to generate absorbed light; a plurality of light guiding devices, each light guiding device having a light input end and a light output end near to the ambient light gathering system, and the absorbed light from the light input end being guided to the light output end; and a wedge light guiding bar having a light-out surface, a light-in surface, an inclined surface, and a first surface, wherein the light-out surface is connected to the light-in surface, the inclined surface is a single surface remaining a specific angle, is adjacent to and directly connected between the first surface and light-in surface, and is opposite to the light-out surface, and is directly connected between the first surface and light-in surface and is opposite to the light-out surface, and the light-in surface is wider than the first surface and is near the light out end of the plurality of light guiding devices, wherein a plurality of cylindrical nodes are set up on the inclined surface and protrude from the inclined surface; wherein the plurality of cylindrical nodes are arranged to scatter light from the light-in surface so as to make the light from the light-out surface more even. ### Claim 7 (depends on 6) The edge-lighting backlight module of claim 6, wherein the light guiding device is an optical fiber. ### Claim 8 (depends on 6) The edge-lighting backlight module of claim 6, wherein reflectors are disposed on the inclined surface, a narrow surface opposite to the light-in surface, a bottom surface coupled to the inclined surface and a top surface opposite to the bottom surface. ### Claim 9 (depends on 6) The edge-lighting backlight module of claim 6, wherein a plurality of semisphere nodes are set up on the inclined surface. ### Claim 10 (depends on 6) The edge-lighting backlight module of claim 6, wherein the wedge light guiding bar is made of polymethyl methacrylate (PMMA). ### Claim 11 A liquid crystal display device comprising: a light guide plate, comprising a light-in side, a bottom side and a light-out side being opposite to each other and coupled to the light-in side; a back bezel, disposed under the bottom side; an optical film, disposed over the light-out side; a display panel, disposed over the optical film; and an edge-lighting backlight module comprising: an ambient light gathering system, facing to ambient light, for absorbing the ambient light to generate absorbed light; a plurality of light guiding devices, each light guiding device having a light input end and a light output end near to the ambient light gathering system, and the absorbed light from the light input end being guided to the light output end; and a wedge light guiding bar having a light-out surface, a light-in surface, an inclined surface, and a first surface, wherein the light-out surface is connected to the light-in surface, the inclined surface is a single surface remaining a specific angle, is adjacent to and directly connected to the first surface and light-in surface, and is opposite to the light-out surface, and the light-in surface is wider than the first surface and is near the light out end of the plurality of light guiding devices, wherein a plurality of cylindrical nodes are set up on the inclined surface and protrude from the inclined surface; wherein the plurality of cylindrical nodes are arranged to scatter light from the light-in surface so as to make the light from the light-out surface more even. ### Claim 12 (depends on 11) The liquid crystal display device of claim 11, wherein the light guiding device is an optical fiber. ### Claim 13 (depends on 11) The liquid crystal display device of claim 11, wherein reflectors are disposed on the inclined surface, a narrow surface opposite to the light-in surface, a bottom surface coupled to the inclined surface and a top surface opposite to the bottom surface. ### Claim 14 (depends on 11) The liquid crystal display device of claim 11, wherein a plurality of semisphere nodes are set up on the inclined surface. ### Claim 15 (depends on 11) The liquid crystal display device of claim 11, wherein the wedge light guiding bar is made of polymethyl methacrylate (PMMA).