# US 11,029,562 B2 · Backlight unit and liquid crystal 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 11,029,562 B2 - Document ID: US11029562B2 - Status: Granted - Kind: B2 - Application number: 16/165,779 - Filed: 2018-10-19 - Published: 2019-05-02 - Granted: 2021-06-08 - Earliest claimed: 2017-10-31 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: Rok-Hee Lee; Yong-Seok Kwak; Il-Soo Kim - Web page: https://patentgrep.com/patent/US11029562B2 ## CPC - G02F 1/133605: {including specially adapted reflectors} - G02B 5/021: {the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures} - G02F 1/133504: {Diffusing, scattering, diffracting elements (associated to illuminating devices G02F1/133606)} - G02F 1/133603: {with LEDs} - G02F 1/133606: {including a specially adapted diffusing, scattering or light controlling members} - G02F 1/133611: {including means for improving the brightness uniformity} - G09G 3/3406: {Control of illumination source (illumination devices structurally associated with liquid crystal cells G02F1/1336)} - G09G 3/36: using liquid crystals - G02F 1/133607: {the light controlling member including light directing or refracting elements, e.g. prisms or lenses} - G02F 1/133614: {using photoluminescence, e.g. phosphors illuminated by UV or blue light} - G09G 3/342: {using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines} - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2320/0626: for control of overall brightness - 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 - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) ## Abstract A liquid crystal display device comprises a liquid crystal panel and a backlight unit under the liquid crystal panel and including a circuit board; a plurality of LED packages mounted on the circuit board; an encapsulation member over the circuit board and covering the plurality of LED packages; and a multi-pattern sheet over the encapsulation member and including a glass complex body containing a phosphor and a plurality of diffusion patterns on an upper surface of the glass complex body, wherein the plurality of diffusion patterns include at least one first pattern corresponding to an LED package and at least one second pattern corresponding to a portion between adjacent LED packages. ## Claims ### Claim 1 A backlight unit, comprising: a circuit board; a plurality of LED packages mounted on the circuit board; an encapsulation member over the circuit board and covering the plurality of LED packages; and a multi-pattern sheet over the encapsulation member and including a glass complex body containing a phosphor, and a plurality of diffusion patterns on an upper surface of the glass complex body, wherein the plurality of diffusion patterns includes a plurality of first patterns, each of the first patterns aligned with a respective LED package of the plurality of LED packages along a first direction, and a plurality of second patterns, each of the second patterns aligned with a respective portion between adjacent LED packages of the plurality of LED packages along the first direction and alternating the each of the first patterns such that a single second pattern is disposed between adjacent first patterns of the plurality of first patterns, wherein the first patterns and the second patterns are different patterns, wherein the single second pattern is a single horn having a vertex, and the single horn is disposed between the adjacent first patterns, and wherein a width of a bottom surface of the single horn contacting the upper surface of the glass complex body is smaller than a width of a bottom surface of each of the adjacent first patterns contacting the upper surface of the glass complex body. ### Claim 2 (depends on 1) The backlight unit of claim 1, wherein the first patterns include a curved surface without a vertex, and the second patterns include a triangle-like shape with a vertex. ### Claim 3 (depends on 2) The backlight unit of claim 2, wherein the first patterns include a hemispherical shape, and the second patterns include a conical shape, a polypyramid shape, or a conical shape having a curved side surface. ### Claim 4 (depends on 1) The backlight unit of claim 1, wherein the diffusion patterns include at least one of an embossed pattern or a depressed pattern. ### Claim 5 (depends on 1) The backlight unit of claim 1, wherein the multi-pattern sheet further includes a plurality of reflective patterns on a lower surface of the glass complex body, and the plurality of reflective patterns correspond to the plurality of LED packages, respectively. ### Claim 6 (depends on 5) The backlight unit of claim 5, wherein one or more of the plurality of reflective patterns have a transmittance at an edge portion that is higher than a transmittance at a center portion. ### Claim 7 (depends on 6) The backlight unit of claim 6, wherein the one or more of the plurality of reflective patterns includes first, second, and third pattern layers sequentially stacked, and an area of the second pattern layer is smaller than an area of the first pattern layer and greater than an area of the third pattern layer. ### Claim 8 (depends on 5) The backlight unit of claim 5, wherein a width d of each reflective pattern satisfies a following equation, d=2{(b−c)tan(θ/2)}, wherein b is a height of the encapsulation member, c is a height of each LED package, and θ is a beam angle of light emitted by the LED package. ### Claim 9 (depends on 1) The backlight unit of claim 1, wherein each LED package includes an LED chip and a reflection member over the LED chip, and the reflection member comprises two successively stacked layers having different refractive indexes. ### Claim 10 A backlight unit, comprising: a circuit board; a plurality of LED packages mounted on the circuit board; an encapsulation member over the circuit board and covering the plurality of LED packages; and a multi-pattern sheet over the encapsulation member and including a glass complex body containing a phosphor, a plurality of diffusion patterns on an upper surface of the glass complex body, and a plurality of reflective patterns on a lower surface of the glass complex body, wherein the plurality of diffusion patterns includes a plurality of first patterns, each of the first patterns aligned with a respective LED package of the plurality of LED packages along a first direction, and a plurality of second patterns, each of the second patterns aligned with a respective portion between adjacent LED packages of the plurality of LED packages along the first direction and alternating the each of the first patterns such that a single second pattern is disposed between adjacent first patterns of the plurality of first patterns, wherein at least one of the LED packages, at least one of the reflective patterns, and at least one of the first patterns overlap each other, wherein the first patterns and the second patterns are different patterns, wherein the single second pattern is a single horn having a vertex, and the single horn is disposed between the adjacent first patterns, and wherein a width of a bottom surface of the single horn contacting the upper surface of the glass complex body is smaller than a width of a bottom surface of each of the adjacent first patterns contacting the upper surface of the glass complex body. ### Claim 11 A liquid crystal display device, comprising: a liquid crystal panel; and a backlight unit under the liquid crystal panel and including: a circuit board; a plurality of LED packages mounted on the circuit board; an encapsulation member over the circuit board and covering the plurality of LED packages; and a multi-pattern sheet over the encapsulation member and including a glass complex body containing a phosphor, and a plurality of diffusion patterns on an upper surface of the glass complex body, wherein the plurality of diffusion patterns includes a plurality of first patterns, each of the first patterns aligned with a respective LED package of the plurality of LED packages along a first direction, and a plurality of second patterns, each of the second patterns aligned with a respective portion between adjacent LED packages of the plurality of LED packages along the first direction and alternating the each of the first patterns such that a single second pattern is disposed between adjacent first patterns of the plurality of first patterns, each of the plurality of first patterns being spaced from each single pattern of the plurality of second patterns, wherein the first patterns and the second patterns are different patterns, wherein the single second pattern is a single horn having a vertex, and the single horn is disposed between the adjacent first patterns, and wherein a width of a bottom surface of the single horn contacting the upper surface of the glass complex body is smaller than a width of a bottom surface of each of the adjacent first patterns contacting the upper surface of the glass complex body. ### Claim 12 (depends on 11) The liquid crystal display device of claim 11, wherein the first patterns include a curved surface without a vertex, and the second patterns include a triangle-like shape with a vertex. ### Claim 13 (depends on 12) The liquid crystal display device of claim 12, wherein the first patterns include a hemispherical shape, and the second patterns include a conical shape, a polypyramid shape, or a conical shape having a curved side surface. ### Claim 14 (depends on 11) The liquid crystal display device of claim 11, wherein the multi-pattern sheet further includes a plurality of reflective patterns on a lower surface of the glass complex body, and the plurality of reflective patterns correspond to the plurality of LED packages, respectively. ### Claim 15 (depends on 14) The liquid crystal display device of claim 14, wherein one or more of the plurality of reflective patterns have a transmittance at an edge portion that is higher than a transmittance at a center portion. ### Claim 16 (depends on 15) The liquid crystal display device of claim 15, wherein the one or more of the plurality of reflective patterns includes first, second, and third pattern layers sequentially stacked, and an area of the second pattern layer is smaller than an area of the first pattern layer and greater than an area of the third pattern layer. ### Claim 17 (depends on 14) The liquid crystal display device of claim 14, wherein a width d of each reflective pattern satisfies a following equation, d=2{(b−c)tan(θ/2)}, wherein b is a height of the encapsulation member, c is a height of each LED package, and θ is a beam angle of light emitted by the LED package. ### Claim 18 (depends on 11) The liquid crystal display device of claim 11, wherein each LED package includes an LED chip and a reflection member over the LED chip, and the reflection member comprises two successively stacked layers having different refractive indexes. ### Claim 19 (depends on 1) The backlight unit of claim 1, wherein each LED package overlaps with a center of a first pattern and is spaced apart from a center of a second pattern adjacent to the center of the first pattern. ### Claim 20 (depends on 10) The backlight unit of claim 10, wherein the at least one of the LED packages overlaps with a center of the at least one of the first patterns and is spaced apart from a center of a second pattern adjacent to the center of the at least one of the first patterns. ### Claim 21 (depends on 11) The liquid crystal display device of claim 11, wherein each LED package overlaps with a center of a first pattern and is spaced apart from a center of a second pattern adjacent to the center of the first pattern. ### Claim 22 (depends on 11) The liquid crystal display device of claim 11, wherein each of the first patterns is overlapped with the respective LED package of the plurality of LED packages. ### Claim 23 A backlight unit, comprising: a circuit board; a plurality of LED packages mounted on the circuit board; an encapsulation member over the circuit board and covering the plurality of LED packages; and a multi-pattern sheet over the encapsulation member and including a glass complex body containing a phosphor, and a plurality of diffusion patterns on an upper surface of the glass complex body, wherein the plurality of diffusion patterns includes a plurality of first patterns, two first patterns aligned with a respective LED package of the plurality of LED packages along a first direction, and a plurality of second patterns, two second patterns aligned with a respective portion between adjacent LED packages of the plurality of LED packages along the first direction and alternating the two first patterns, wherein the two first patterns have a same size, and the two second patterns have a same size, wherein the first patterns and the second patterns are different patterns, and wherein a width of a bottom surface of each of the two second patterns contacting the upper surface of the glass complex body is smaller than a width of a bottom surface of each of the two first patterns contacting the upper surface of the glass complex body. ### Claim 24 (depends on 1) The backlight unit of claim 1, wherein a maximum thickness of the encapsulation member is five times a thickness of each of the plurality of LED packages.