# US 10,371,881 B2 · Optical member and display device including the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,371,881 B2 - Document ID: US10371881B2 - Status: Granted - Kind: B2 - Application number: 16/111,215 - Filed: 2018-08-24 - Published: 2019-03-14 - Granted: 2019-08-06 - Earliest claimed: 2017-09-08 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co. Ltd. - Inventors: Seong Yong Hwang; Young Min Park; Ju Young Yoon; Sung Kyu Shim; Sang Won Lee - Web page: https://patentgrep.com/patent/US10371881B2 ## CPC - G02B 6/0061: {to provide homogeneous light output intensity} - G02B 6/0035: {provided on the surface of the light guide or in the bulk of it} - G02B 6/005: {provided by one optical element, or plurality thereof, placed on the light output side of the light guide} - G02B 6/0055: {Reflecting element, sheet or layer} - G02B 6/0093: {Means for protecting the light guide} - G02B 6/0043: {provided on the surface of the light guide} - G02B 6/0068: {Arrangements of plural sources, e.g. multi-colour light sources} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract An optical member including a light guide plate including a surface disposed on a plane defined by a first direction and a second direction crossing the first direction, a low refractive index pattern disposed on the surface of the light guide plate and including an opening for exposing the surface of the light guide plate, a wavelength conversion layer disposed on the low refractive index pattern, and a passivation layer disposed on the wavelength conversion layer and covering a side surface of the wavelength conversion layer and a side surface of the low refractive index pattern at least one side portion. The low refractive index pattern has a lower index of refraction than the light guide plate, and a ratio of an area occupied by the low refractive index pattern to an area of the surface of the light guide plate decreases in the first direction. ## Claims ### Claim 1 An optical member comprising: a light guide plate including a surface disposed on a plane defined by a first direction and a second direction crossing the first direction; a low refractive index pattern disposed on the surface of the light guide plate and including an opening for exposing the surface of the light guide plate; a wavelength conversion layer disposed on the low refractive index pattern; and a passivation layer disposed on the wavelength conversion layer and configured to cover a side surface of the wavelength conversion layer and a side surface of the low refractive index pattern at at least one side portion, wherein: the low refractive index pattern has a lower index of refraction than the light guide plate; and a ratio of an area occupied by the low refractive index pattern to an area of the surface of the light guide plate decreases in the first direction. ### Claim 2 (depends on 1) The optical member of claim 1, wherein the surface of the light guide plate exposed by the opening is in contact with the wavelength conversion layer. ### Claim 3 (depends on 2) The optical member of claim 2, wherein the opening is a through hole configured to pass through the low refractive index pattern in a third direction perpendicular to the plane. ### Claim 4 (depends on 3) The optical member of claim 3, wherein the through hole comprises a plurality of through holes having a certain planar area in the first direction and the second direction. ### Claim 5 (depends on 4) The optical member of claim 4, wherein the plurality of through holes have an arrangement density gradually increasing in the first direction. ### Claim 6 (depends on 4) The optical member of claim 4, wherein the through hole comprises a plurality of through holes having a planar area gradually increasing in the first direction. ### Claim 7 (depends on 6) The optical member of claim 6, wherein the wavelength conversion layer has an area in contact with the surface of the light guide plate, and the area gradually increases in the first direction. ### Claim 8 (depends on 2) The optical member of claim 2, wherein the low refractive index pattern is composed of a plurality of low refractive index patterns spaced apart from each other to form the opening. ### Claim 9 (depends on 8) The optical member of claim 8, wherein each of the plurality of low refractive index patterns has a planar area gradually decreasing in the first direction. ### Claim 10 (depends on 9) The optical member of claim 9, wherein the wavelength conversion layer has an area in contact with the surface of the light guide plate, and the area gradually increases in the first direction. ### Claim 11 (depends on 1) The optical member of claim 1, wherein the light guide plate comprises an inorganic material. ### Claim 12 (depends on 11) The optical member of claim 11, wherein a difference between a refractive index of the light guide plate and a refractive index of the low refractive index pattern is 0.2 or more. ### Claim 13 (depends on 12) The optical member of claim 12, wherein the wavelength conversion layer has a higher refractive index than the low refractive index pattern. ### Claim 14 An optical member comprising: a light guide plate including a surface, a first side surface crossing the surface, and a second surface opposite the first side surface; a low refractive index pattern disposed on the surface of the light guide plate and comprising an opening for exposing the surface of the light guide plate; a wavelength conversion layer disposed on the low refractive index pattern; and a passivation layer disposed on the wavelength conversion layer and covering a side surface of the wavelength conversion layer and a side surface of the low refractive index pattern at at least one side portion, wherein: the low refractive index pattern has a lower index of refraction than the light guide plate; and a ratio of an area occupied by the low refractive index pattern to an area of the surface of the light guide plate decreases in a direction away from the first side surface. ### Claim 15 (depends on 14) The optical member of claim 14, wherein the ratio of the area occupied by the low refractive index pattern to an area of the surface of the light guide plate decreases in a direction away from the second side surface. ### Claim 16 (depends on 15) The optical member of claim 15, wherein the surface of the light guide plate exposed by the opening is in contact with the wavelength conversion layer. ### Claim 17 (depends on 16) The optical member of claim 16, wherein the wavelength conversion layer has a higher refractive index than the low refractive index pattern. ### Claim 18 A display device comprising: an optical member comprising, a light guide plate including a light incidence surface, a low refractive index layer disposed on the light guide plate and having a lower index of refraction than the light guide plate, a wavelength conversion layer disposed on the low refractive index layer, and a passivation layer disposed on the wavelength conversion layer and covering a side surface of the wavelength conversion layer and a side surface of the low refractive index layer at at least one side portion; a light source disposed at a side of the light incidence surface of the light guide plate; and a display panel disposed on the optical member, wherein the low refractive index layer comprises patterns, and an area in which the low refractive index layer is disposed decreases in a direction away from the light incidence surface. ### Claim 19 (depends on 18) The display device of claim 18, further comprising a reflective member disposed under the optical member, wherein the wavelength conversion layer is disposed between the light guide plate and the display panel. ### Claim 20 (depends on 18) The display device of claim 18, further comprising a reflective member disposed under the optical member, wherein the wavelength conversion layer is disposed between the light guide plate and the reflective member.