# US 10,502,886 B2 · Reflective polarizing module having diffusion pattern and backlight unit including same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,502,886 B2 - Document ID: US10502886B2 - Status: Granted - Kind: B2 - Application number: 15/578,919 - Filed: 2016-05-21 - Published: 2018-06-21 - Granted: 2019-12-10 - Earliest claimed: 2015-06-04 - Assignees: Lms Co., Ltd. - Applicants: Lms Co.,Ltd - Inventors: Jee Hong Min; Eun Mi Lee - Web page: https://patentgrep.com/patent/US10502886B2 ## CPC - G02B 6/0056: {for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing elements} - G02B 5/0221: {the surface having an irregular structure (G02B5/0226 takes precedence)} - G02B 5/0231: {the surface having microprismatic or micropyramidal shape (macroscopic prism arrays G02B5/045)} - G02B 6/0051: {Diffusing sheet or layer} - G02B 6/0053: {Prismatic sheet or layer; Brightness enhancement element, sheet or layer} - G02B 6/0055: {Reflecting element, sheet or layer} - G02B 27/28: for polarising (used in stereoscopes G02B30/25) - G02F 1/13362: {providing polarized light, e.g. by converting a polarisation component into another one} - G02B 6/0031: {Reflecting element, sheet or layer} - G02B 6/0046: {Tapered light guide, e.g. wedge-shaped light guide} - 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 A reflective polarizing module is provided which includes a reflective polarizing sheet to selectively transmit light; a light-condensing sheet having continuously repeating light-condensing bodies, wherein each of the light-condensing bodies has a gradually decreasing transverse cross-sectional area from the lower portion to the upper portion of the reflective polarizing sheet, and the upper end of the first unit light-condensing body is bonded to the lower portion of the reflective polarizing sheet so as to have a first transverse width; and a coating layer on the upper surface of the reflective polarizing sheet and having a diffusion pattern to diffuse light transmitted through the reflective polarizing sheet, the diffusion pattern being constituted by a plurality of diffusion protrusions protruding from the upper surface of the coating layer, wherein at least some of the plurality of diffusion protrusions are formed to have a transverse width relatively smaller than the first transverse width. ## Claims ### Claim 1 A reflective polarizing module comprising: a reflective polarizing sheet having a plurality of layers with different refractive indices stacked one above another to selectively transmit light; a first light-condensing sheet having a first structuralized pattern in which first unit light-condensing bodies are continuously repeated, wherein each of the first unit light-condensing bodies has an upwardly gradually decreasing transverse cross-sectional area, and an upper end of each of the first unit light-condensing bodies is bonded to a lower portion of the reflective polarizing sheet so as to have a first width along a traverse direction; and a coating layer located on an upper surface of the reflective polarizing sheet and having a diffusion pattern formed on an upper surface thereof to diffuse light transmitted through the reflective polarizing sheet, the diffusion pattern having a plurality of diffusion protrusions protruding from the upper surface of the coating layer, wherein at least two of the plurality of diffusion protrusions are respectively formed to have a transverse width relatively smaller than the first width. ### Claim 2 (depends on 1) The reflective polarizing module of claim 1, wherein the diffusion protrusion has a non-uniform size and is formed on the upper surface of the coating layer. ### Claim 3 (depends on 1) The reflective polarizing module of claim 1, further comprising a bonding layer which is located on a lower surface of the reflective polarizing sheet and is embedded and bonded so that the upper end of each of the first unit light-condensing bodies has a boundary surface of a second width in the transverse direction, wherein at least two of the plurality of diffusion protrusions are respectively formed to have a transverse width relatively smaller than the second width. ### Claim 4 (depends on 3) The reflective polarizing module of claim 3, wherein the bonding layer has a plurality of non-uniform bonding patterns and is located on the lower surface of the reflective polarizing sheet. ### Claim 5 (depends on 4) The reflective polarizing module of claim 4, wherein a length of a transverse width of one of the bonding patterns formed on the bonding layer is relatively smaller than the first width. ### Claim 6 (depends on 1) The reflective polarizing module of claim 1, wherein the first light-condensing sheet has a non-uniform vertical distance ranging from a lowermost end to an uppermost end of each of the first unit light-condensing bodies. ### Claim 7 (depends on 6) The reflective polarizing module of claim 6, wherein the first structuralized pattern is formed in such a manner that the first unit light-condensing bodies are extended lengthways and repeatedly formed and a height of each of the first unit light-condensing bodies is changed along an extension direction. ### Claim 8 A back light unit comprising: a light guide plate having a light source at one side thereof and transmitting light generated from the light source downwardly; a reflector which is stacked on a lower surface of the light guide plate and reflects light transmitted through the light guide plate upwardly; an optical module comprising a diffusion sheet stacked on an upper portion of the light guide plate to diffuse light transmitted from below and a first light-condensing sheet having a first structuralized pattern which is coupled to an upper portion of the diffusion sheet, and in which first unit light-condensing bodies are continuously repeated, wherein each of the first unit light-condensing bodies has an upwardly gradually decreasing transverse cross-sectional area; and a reflective polarizing module comprising a reflective polarizing sheet having a plurality of layers with different refractive indices stacked one above another to selectively transmit light, a second light-condensing sheet having a second structuralized pattern in which second unit light-condensing bodies are continuously repeated, wherein each of the second unit light-condensing bodies has an upwardly gradually decreasing transverse cross-sectional area, and an upper end of each of the second unit light-condensing bodies is bonded to a lower portion of the reflective polarizing sheet so as to have a first width along a traverse direction, and a coating layer located on an upper surface of the reflective polarizing sheet and having a diffusion pattern formed on an upper surface thereof to diffuse light transmitted through the reflective polarizing sheet, the diffusion pattern having a plurality of diffusion protrusions protruding from the upper surface of the coating layer, wherein at least two of the plurality of diffusion protrusions are formed to have a transverse width relatively smaller than the first width.