# US 8,465,194 B2 · Backlight module, light guide plate thereof and ink thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,465,194 B2 - Document ID: US8465194B2 - Status: Granted - Kind: B2 - Application number: 12/947,140 - Filed: 2010-11-16 - Published: 2011-08-18 - Granted: 2013-06-18 - Earliest claimed: 2010-02-12 - Assignees: Chi Lin Optoelectronics Co., Ltd. - Applicants: Hsi-Hsin Shih; Hung-Wen Wang; Chin-Ming Wang; Chien-Tsung Wu; Shao-Ming Lee - Inventors: Hsi-Hsin Shih; Hung-Wen Wang; Chin-Ming Wang; Chien-Tsung Wu; Shao-Ming Lee - Web page: https://patentgrep.com/patent/US8465194B2 ## CPC - G02B 6/0043: {provided on the surface of the light guide} - G02F 1/1336: {Illuminating devices} - G02B 6/0046: {Tapered light guide, e.g. wedge-shaped light guide} - G02B 6/0055: {Reflecting element, sheet or layer} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - 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 The present invention relates to a backlight module, light guide plate thereof and ink thereof. The ink includes a base resin and an additive. The additive is dispersed in the base resin for increasing the printability of the ink. The additive comprises a polymer having hydroxy functional group, ester functional group, ether functional group or combination thereof. Use of the ink of the present invention will reduce the color difference and the variation of color temperature of the light guide plate. In addition, the ink has higher flowability, which increases the printability of the ink. ## Claims ### Claim 1 An ink comprising: a base resin; and an additive, dispersed in the base resin for increasing the printability of the ink, and comprising a polymer having hydroxy functional group, ester functional group, ether functional group or combination thereof. ### Claim 2 (depends on 1) The ink as claimed in claim 1, wherein the base resin comprises at least one selected from the group consisting of epoxy resin, polyester resin, acrylic resin, polyvinyl resin, polyamide resin, polyurethane resin, a copolymer thereof and a combination thereof. ### Claim 3 (depends on 1) The ink as claimed in claim 1, wherein the polymer of the additive is polytether polyol or polyester polyol. ### Claim 4 (depends on 3) The ink as claimed in claim 3, wherein the polytether polyol is selected from the group consisting of poly(ethylene oxide) (PEO), poly(ethylene glycol) (PEG), poly(tetramethylene oxide) (PTMO) and poly(tetramethylene glycol) (PTMG). ### Claim 5 (depends on 3) The ink as claimed in claim 3, wherein the molecular weight of the polyester polyol is 300 to 10,000 g/mole. ### Claim 6 (depends on 1) The ink as claimed in claim 1, wherein the amount of the additive is 0.5 to 30 weight % of the ink. ### Claim 7 (depends on 1) The ink as claimed in claim 1, wherein the amount of the additive is 0.5 to 15 weight % of the ink. ### Claim 8 (depends on 1) The ink as claimed in claim 1, further comprising a plurality of fine particles dispersed in the base resin for diffusing light, the fine particles being polymeric or inorganic. ### Claim 9 (depends on 1) The ink as claimed in claim 1, wherein the chemical structure of the polymer of the additive has a branch structure, a brush structure or a star structure. ### Claim 10 A light guide plate comprising: a light guide plate body, having a first surface; and an ink disposed on the first surface of the light guide plate body, the ink comprising: a base resin; and an additive, dispersed in the base resin for increasing the printability of the ink, and comprising a polymer having hydroxy functional group, ester functional group, ether functional group or combination thereof. ### Claim 11 (depends on 10) The light guide plate as claimed in claim 10, wherein the material of the light guide plate body is polymethyl methacrylate (PMMA), arcylic-based polymer, polycarbonate (PC), polyethylene terephthalate (PET), polystyrene (PS) or a copolymer thereof. ### Claim 12 (depends on 10) The light guide plate as claimed in claim 10, wherein the base resin comprises at least one selected from the group consisting of epoxy resin, polyester resin, acrylic resin, polyvinyl resin, polyamide resin, polyurethane resin, a copolymer thereof and a combination thereof. ### Claim 13 (depends on 10) The light guide plate as claimed in claim 10, wherein the polymer of the additive is polytether polyol or polyester polyol. ### Claim 14 (depends on 13) The light guide plate as claimed in claim 13, wherein the polytether polyol is selected from the group consisting of poly(ethylene oxide) (PEO), poly(ethylene glycol) (PEG), poly(tetramethylene oxide) (PTMO) and poly(tetramethylene glycol) (PTMG). ### Claim 15 (depends on 13) The light guide plate as claimed in claim 13, wherein the molecular weight of the polyester polyol is 300 to 10,000 g/mole. ### Claim 16 (depends on 10) The light guide plate as claimed in claim 10, wherein the amount of the additive is 0.5 to 30 weight % of the ink. ### Claim 17 (depends on 10) The light guide plate as claimed in claim 10, wherein the amount of the additive is 0.5 to 15 weight % of the ink. ### Claim 18 (depends on 10) The light guide plate as claimed in claim 10, wherein the ink further comprises a plurality of fine particles dispersed in the base resin for diffusing light, the fine particles being polymeric or inorganic. ### Claim 19 (depends on 10) The light guide plate as claimed in claim 10, wherein the chemical structure of the polymer of the additive has a branch structure, a brush structure or a star structure. ### Claim 20 A backlight module comprising: a light source, for providing a light beam; a light guide plate, for receiving and mixing the light beam from the light source, the light guide plate comprising: a light guide plate body, having a first surface and a second surface; and an ink disposed on the first surface of the light guide plate body, the ink comprising: a base resin; and an additive, dispersed in the base resin for increasing the printability of the ink, and comprising a polymer having hydroxy functional group, ester functional group, ether functional group or combination thereof; a reflector, disposed below the light guide plate, and being used to reflect part of the light beam back to the light guide plate; and an diffusion film, disposed above or on the light guide plate, and being used to diffuse the light beam from the second surface of the light guide plate body.