# US 10,310,168 B2 · Light guide plate, backlight unit having the same, display apparatus having the same, and method of manufacturing the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,310,168 B2 - Document ID: US10310168B2 - Status: Granted - Kind: B2 - Application number: 14/817,958 - Filed: 2015-08-04 - Published: 2016-04-07 - Granted: 2019-06-04 - Earliest claimed: 2014-10-07 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Hyoung-Joo Kim; Sunhee Oh; Dongyeon Kang - Web page: https://patentgrep.com/patent/US10310168B2 ## CPC - G02B 6/0065: {Manufacturing aspects; Material aspects} - G02B 6/002: {by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces} - G02B 6/0036: {2-D arrangement of prisms, protrusions, indentations or roughened surfaces} - G02B 6/0055: {Reflecting element, sheet or layer} - G02B 6/0061: {to provide homogeneous light output intensity} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A light guide plate includes a light incident surface to which a light is configured to be incident, a light exit surface from which the light incident through the light incident surface is configured to exit, a bottom surface facing the light exit surface configured to reflect at least a portion of the incident light, and a scattering pattern disposed on the bottom surface. The scattering pattern includes a first protrusion portion protruding from the bottom surface, a recess portion disposed along a circumference of the first protrusion portion and recessed from the bottom surface and a second protrusion portion spaced apart from the first protrusion portion and disposed along a portion of the recess portion. ## Claims ### Claim 1 A light guide plate comprising: a light incident surface to which a light is configured to be incident; a light exit surface from which the light incident through the light incident surface is configured to exit; a bottom surface facing the light exit surface configured to reflect at least a portion of the incident light; and a scattering pattern disposed on the bottom surface, wherein the scattering pattern consists of: a first protrusion portion protruding from the bottom surface; a recess portion disposed along a circumference of the first protrusion portion and recessed from the bottom surface; and a second protrusion portion spaced apart from the first protrusion portion and disposed along a portion of the recess portion, wherein the first protrusion portion has a circular shape and the second protrusion portion is disposed only in a first region with respect to an imaginary line crossing a center of the first protrusion portion and dividing the scattering pattern into the first region and a second region. ### Claim 2 (depends on 1) The light guide plate of claim 1, wherein the second protrusion portion is disposed along at least a portion of the recess portion disposed in the first region. ### Claim 3 (depends on 1) The light guide plate of claim 1, wherein the first protrusion portion has a height different from a height of the second protrusion portion. ### Claim 4 (depends on 1) The light guide plate of claim 1, wherein the light exit surface comprises a slant surface disposed adjacent to the light incident surface and slanted towards the bottom surface. ### Claim 5 (depends on 4) The light guide plate of claim 4, wherein the slant surface becomes farther away from the bottom surface as a distance from the light incident surface becomes smaller. ### Claim 6 (depends on 5) The light guide plate of claim 5, wherein the light exit surface further comprises: a first flat surface substantially parallel to the bottom surface; and a second flat surface disposed between the light incident surface and the slant surface and substantially parallel to the bottom surface. ### Claim 7 (depends on 6) The light guide plate of claim 6, wherein a thickness between the bottom surface and the second flat surface is greater than a thickness between the bottom surface and the first flat surface. ### Claim 8 (depends on 1) The light guide plate of claim 1, wherein the scattering pattern is provided in a plural number. ### Claim 9 (depends on 8) The light guide plate of claim 8, wherein the scattering patterns have different sizes from each other. ### Claim 10 (depends on 8) The light guide plate of claim 8, wherein the scattering patterns are regularly arranged along at least one of row and column directions. ### Claim 11 (depends on 8) The light guide plate of claim 8, wherein the first protrusion portion of each of the scattering patterns has a circular shape, the second protrusion portion is disposed only in a first region with respect to imaginary lines each crossing a center of the first protrusion portion and dividing a corresponding scattering pattern of the scattering patterns into the first region and a second region, and the imaginary lines are substantially parallel to each other. ### Claim 12 A light guide plate comprising: a light incident surface to which a light is configured to be incident; a light exit surface from which the light incident through the light incident surface is configured to exit; a bottom surface facing the light exit surface configured to reflect at least a portion of the incident light; and a scattering pattern disposed on the bottom surface, wherein the scattering pattern comprises: a first protrusion portion having a circular shape and protruding from the bottom surface; a recess portion disposed along a circumference of the first protrusion portion and recessed from the bottom surface; and a second protrusion portion spaced apart from the first protrusion portion and disposed along a portion of the recess portion, wherein scattering pattern is divided into the first region and a second region with respect to an imaginary line crossing a center of the first protrusion portion, the second protrusion portion is disposed only in a first region, and the maximum height in a portion of the first region, which is not overlapped with the first protrusion, is higher than the maximum height in a portion of the second region, which is not overlapped with the first protrusion.