# US 2010/0164874 A1 · Backlight Module and Related Manufacturing Method and Operation Interface > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2010/0164874 A1 - Document ID: US20100164874A1 - Status: Published application - Kind: A1 - Application number: 12/435,389 - Filed: 2009-05-04 - Published: 2010-07-01 - Earliest claimed: 2008-12-31 - Assignees: Wistron Corporation - Inventors: Chih-Feng Yeh; Cheng-Ju Lee; Chia-Hung Chan - Web page: https://patentgrep.com/patent/US20100164874A1 ## CPC - G06F 1/1613: {for portable computers (cooling arrangements therefor G06F1/203; constructional details or arrangements for pocket calculators, electronic agendas or books G06F15/0216; constructional details of portable telephone sets: with several bodies H04M1/0202)} - G02B 6/0035: {provided on the surface of the light guide or in the bulk of it} - G06F 1/1662: {Details related to the integrated keyboard} - H01H 13/83: characterised by legends, e.g. Braille, liquid crystal displays, light emitting or optical elements - H01J 9/227: with luminescent material discontinuously arranged, e.g. in dots or lines - G02B 6/0065: {Manufacturing aspects; Material aspects} - H01H 2219/044: Edge lighting of layer - H01H 2219/052: Phosphorescence - H01H 2219/062: Light conductor - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - H01H: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B7/10; electrolytic self-interrupters H01G9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K17/00) - H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H) ## Abstract A backlight module for an operation interface of a portable electronic device is disclosed. The operation interface includes at least one keypad. The backlight module includes a light guide film including at least one hole corresponding to the at least one keypad, a backlight board installed in the bottom of the light guide film for reflecting light, and a light emitting unit installed in a side of the light guide film for generating light source to inside of the light guide film, wherein the at least one hole of the light guide film is filled with a phosphor material. ## Claims ### Claim 1 A backlight module for an operation interface of a portable electronic device, the operation interface comprising at least one keypad, the backlight module comprising: a light guide film, comprising at least one hole corresponding to the at least one keypad, and filled with a phosphor material into the hole; a backlight board, installed at a bottom of the light guide film, for reflecting light; and a light emitting unit, installed on a side of the light guide film, for generating a light source to an inside of the light guide film. ### Claim 2 (depends on 1) The backlight module of claim 1, wherein the phosphor material is liquid. ### Claim 3 (depends on 2) The backlight module of claim 2, wherein a volume of the phosphor material after dry is smaller than a volume of the phosphor material before dry. ### Claim 4 (depends on 3) The backlight module of claim 3, wherein the phosphor material forms a double concave structure in the at least one hole. ### Claim 5 (depends on 1) The backlight module of claim 1, wherein the phosphor material is powdery. ### Claim 6 (depends on 5) The backlight module of claim 5, wherein the phosphor material is filled in the at least one hole by hot pressing. ### Claim 7 (depends on 6) The backlight module of claim 6, wherein the phosphor material forms a double concave structure in the at least one hole. ### Claim 8 A method of manufacturing a backlight module comprising: forming a light guide film; forming at least one hole at a position corresponding to at least one keypad of an operation interface in the light guide film; filling the at least one hole with a phosphor material; forming a backlight board at a bottom of the light guide film; and forming a light emitting unit on a side of the light guide film. ### Claim 9 (depends on 8) The method of claim 8, wherein a volume of the phosphor material after dry is smaller than a volume of the phosphor material before dry. ### Claim 10 (depends on 8) The method of claim 8, wherein the phosphor material is filled in the at least one hole by hot pressing. ### Claim 11 (depends on 8) The method of claim 8 further comprising forming a double concave structure in the phosphor material of the at least one hole. ### Claim 12 An operation interface for a portable electronic device comprising: at least one keypad; a backlight module comprising: a light guide film, comprising at least one hole corresponding to the at least one keypad, and filled with a phosphor material; a backlight board, installed at a bottom of the light guide film, for reflecting light; and a light emitting unit, installed on a side of the light guide film, for generating a light source to an inside of the light guide film; a power supply device, for providing a power source to the light emitting unit; and a control circuit, for controlling the power supply device according to a pressing condition of the at least one keypad. ### Claim 13 (depends on 12) The operation interface of claim 12, wherein the phosphor material is liquid. ### Claim 14 (depends on 13) The operation interface of claim 13, wherein a volume of the phosphor material after dry is smaller than a volume of the phosphor material before dry. ### Claim 15 (depends on 14) The operation interface of claim 14, wherein the phosphor material forms a double concave structure in the at least one hole. ### Claim 16 (depends on 12) The operation interface of claim 12, wherein the phosphor material is powdery. ### Claim 17 (depends on 16) The operation interface of claim 16, wherein the phosphor material is filled in the at least one hole by hot pressing. ### Claim 18 (depends on 17) The operation interface of claim 17, wherein the phosphor material forms a double concave structure in the at least one hole. ### Claim 19 (depends on 12) The operation interface of claim 12, wherein the control circuit comprises: a determining unit, for determining the pressing condition of the at least one keypad, to generate a determination result; and a switching unit, for controlling the power supply device to intermittently output the power source to the light emitting unit while the determination result indicates that the at least one keypad is pressed.