# US 2014/0192556 A1 · Backlight unit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0192556 A1 - Document ID: US20140192556A1 - Status: Published application - Kind: A1 - Application number: 14/058,084 - Filed: 2013-10-18 - Published: 2014-07-10 - Earliest claimed: 2013-01-10 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Taek-Sun SHIN; Seul-Gi KIM; Yongkyu KANG; Hayoung LEE - Web page: https://patentgrep.com/patent/US20140192556A1 ## CPC - G02B 6/0016: {Grooves, prisms, gratings, scattering particles or rough surfaces} - G02B 6/0018: {Redirecting means on the surface of the light guide} - G02B 6/002: {by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces} - G02B 6/0021: {for housing at least a part of the light source, e.g. by forming holes or recesses} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A back light unit includes a light source and a light guide unit having a first surface emitting light to a display panel, a second surface facing the first surface, and a plurality of connecting surfaces connecting the first surface and the second surface. The connecting surfaces includes a first side surface, a second side surfaces and a third side surface between the first side surface and a second side surface, A first included angle of the first incident surface and the first diffusion surface is equal to or greater than about 90 degree. ## Claims ### Claim 1 A backlight unit comprising: a light source emitting light; and a light guide unit that includes a first surface, a second surface facing the first surface, and a plurality of connecting surfaces connecting the first surface and the second surface, the light guide unit guide the light from the light source to the display panel, the connecting surfaces comprising: a first side surface extending in a first direction; a second side surface facing the first side surface; a third side surface extending in a second direction substantially perpendicular to the first direction; and a first incident surface disposed between the first side surface and the third side surface, the first incident surface receiving the light from the light source and including at least one first serration pattern having a first diffusion surface and a second diffusion surface which is closer to the third side surface than the first diffusion surface, wherein a first included angle of the first incident surface and the first diffusion surface is equal to or greater than about 90 degree. ### Claim 2 (depends on 1) The backlight unit of claim 1, wherein the first included angle is equal to or smaller than 120 degree. ### Claim 3 (depends on 2) The backlight unit of claim 2, wherein the first included angle of the first incident surface and the first diffusion surface is equal to or smaller than 117 degree. ### Claim 4 (depends on 3) The backlight unit of claim 3, wherein the at least one first serration pattern is provided in a plural number, wherein a second included angle of the first incident surface and the second diffusion surface of one of the first serration patterns is differ from a second included angle of the first incident surface and the second diffusion surface of other one of the first serration patterns. ### Claim 5 (depends on 4) The backlight unit of claim 4, wherein each of the first serration patterns further comprises a third diffusion surface disposed between the first diffusion surface and the second diffusion surface, the third diffusion surface is substantially parallel to the first incident surface. ### Claim 6 (depends on 5) The backlight unit of claim 5, wherein the first serration patterns are spaced apart from each other. ### Claim 7 (depends on 6) The backlight unit of claim 6, wherein the second included angle surface is equal to or greater than about 35 degree and equal to or smaller than 60 degree. ### Claim 8 (depends on 4) The backlight unit of claim 4, wherein the first serration patterns are spaced apart from each other. ### Claim 9 (depends on 8) The backlight unit of claim 8, wherein the second included angle surface is equal to or greater than about 35 degree and equal to or smaller than 60 degree. ### Claim 10 (depends on 3) The backlight unit of claim 3, further comprising: a third diffusion surface disposed between the first diffusion surface and the second diffusion surface, the third diffusion surface is substantially parallel to the first incident surface. ### Claim 11 (depends on 10) The backlight unit of claim 10, wherein the first serration pattern is provided in a plural number, wherein the first serration patterns are spaced apart from each other. ### Claim 12 (depends on 3) The backlight unit of claim 3, wherein the first serration pattern is provided in a plural number, wherein the first serration patterns are spaced apart from each other. ### Claim 13 (depends on 2) The backlight unit of claim 2, wherein the first serration pattern is provided in a plural number, wherein a second included angle of the first incident surface and the second diffusion surface of one of the first serration patterns is differ from a second included angle of the first incident surface and the second diffusion surface of other one of the first serration patterns. ### Claim 14 (depends on 13) The backlight unit of claim 13, wherein each of the first serration patterns further comprises a third diffusion surface disposed between the first diffusion surface and the second diffusion surface, the third diffusion surface is substantially parallel to the first incident surface. ### Claim 15 (depends on 14) The backlight unit of claim 14, wherein the first serration patterns are spaced apart from each other. ### Claim 16 (depends on 15) The backlight unit of claim 15, wherein the second included angle surface is equal to or greater than about 35 degree and equal to or smaller than 60 degree. ### Claim 17 (depends on 13) The backlight unit of claim 13, wherein the first serration patterns are spaced apart from each other. ### Claim 18 (depends on 17) The backlight unit of claim 17, wherein the second included angle surface is equal to or greater than about 35 degree and equal to or smaller than 60 degree. ### Claim 19 (depends on 2) The backlight unit of claim 2, wherein the at least one first serration pattern further comprises a third diffusion surface disposed between the first diffusion surface and the second diffusion surface, the third diffusion surface is substantially parallel to the first incident surface. ### Claim 20 (depends on 19) The backlight unit of claim 19, wherein the at least one first serration pattern includes two serration patterns, the at least one first serration pattern further includes a portion of the first incident surface disposed between two first serration patterns. ### Claim 21 A backlight unit comprising: a light source emitting a light; and a light guide unit that includes a first surface, a second surface facing the first surface, and a plurality of connecting surfaces connecting the first surface and the second surface to guide the light from the light source, the connecting surfaces comprising: a first side surface extending in a first direction; a second side surface facing the first side surface; a third side surface that extends in a second direction crossing the first direction; and a first incident surface disposed between the first side surface and the third side surface, receiving the light from the light source, and including at least one first serration pattern having a first diffusion surface and a second diffusion surface, wherein the first incident surface defines a first included angle with respect to an extension surface of the third side surface, and wherein a second included angle of the first diffusion surface with respect to the first incident surface is in a range determined by the following Equation, and a third included angle of the second diffusion surface with respect to the first incident surface is smaller than the second included angle, Equation 90≦θ2≦90+θ1, where θ2 denotes the second included angle and θ1 denotes the first included angle. ### Claim 22 (depends on 21) The backlight unit of claim 21, wherein the first included angle is greater than about 20 degrees and smaller than about 30 degrees. ### Claim 23 (depends on 21) The backlight unit of claim 21, further comprising a second incident surface disposed between the second side surface and the third side surface, receiving the light from the light source, and including at least one second serration pattern. ### Claim 24 (depends on 23) The backlight unit of claim 23, wherein the first incident surface has a shape symmetrical with a shape of the second incident surface when viewed in a plan view. ### Claim 25 (depends on 21) The backlight unit of claim 21, wherein the first serration pattern further comprises a third diffusion surface disposed between the first diffusion surface and the second diffusion surface. ### Claim 26 (depends on 21) The backlight unit of claim 21, wherein the first serration pattern is provided in a plural number. ### Claim 27 (depends on 26) The backlight unit of claim 26, wherein any one of the first serration patterns has a shape different from a shape of another one of the first serration patterns when viewed in a plan view. ### Claim 28 (depends on 27) The backlight unit of claim 27, wherein an included angle between the third side surface and the second diffusion surface of each of the any one of the first serration patterns and the another one of the first serration patterns is equal to or greater than about 35 degrees and equal to or smaller than about 60 degrees.