# US 11,906,846 B2 · Display device and manufacturing method therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,906,846 B2 - Document ID: US11906846B2 - Status: Granted - Kind: B2 - Application number: 18/113,359 - Filed: 2023-02-23 - Published: 2023-06-22 - Granted: 2024-02-20 - Earliest claimed: 2020-09-16 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Youngchol Lee; Hyungsuk Kim; Naewon Jang; Seokwoo Yong; Junsung Choi - Web page: https://patentgrep.com/patent/US11906846B2 ## CPC - G02F 1/1333: Constructional arrangements; {Manufacturing methods}(G02F1/135, G02F1/136 take precedence) - G02F 1/133614: {using photoluminescence, e.g. phosphors illuminated by UV or blue light} - G02F 1/133603: {with LEDs} - G02F 1/133605: {including specially adapted reflectors} - G02F 1/133606: {including a specially adapted diffusing, scattering or light controlling members} - G02F 1/133608: {including particular frames or supporting means} - G02F 1/133611: {including means for improving the brightness uniformity} - G02F 1/133612: {Electrical details} - G02F 1/133621: {providing coloured light (G02F1/133617, G02F1/133533 take precedence)} - G02F 2201/346: distributed (Bragg) reflector - G02F 2202/36: Micro- or nanomaterials - 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 display device according to the disclosure comprises: a liquid crystal panel having a front surface configured to display an image; and a light source plate disposed at the rear of the liquid crystal panel configured to provide light to the liquid crystal panel, wherein the light source plate comprises: a printed circuit board having a mounting surface; an LED chip directly mounted on the mounting surface as a chip on board (COB); a transparent resin disposed on the LED chip to encompass the LED chip; a light conversion layer configured to convert the wavelength of light emitted from the LED chip and encompassing the outer peripheral surface of the transparent resin; and a barrier layer covering the light conversion layer from the outside. ## Claims ### Claim 1 A display device comprising: a liquid crystal panel; and a light source plate disposed behind the liquid crystal panel configured to provide the liquid crystal panel with light, wherein the light source plate includes: a printed circuit board (PCB) having a mounting surface; a light emitting diode (LED) chip mounted on the mounting surface; a transparent resin disposed on the LED chip to substantially surround the LED chip; a light conversion layer configured to convert a wavelength of light emitted from the LED chip, the light conversion layer substantially surrounding an outer surface of the transparent resin; a barrier layer covering the light conversion layer from an outside; and an auxiliary light conversion layer disposed on the mounting surface adjacent to the LED chip, wherein a portion of the auxiliary light conversion layer above the mounting surface is substantially surrounded by the transparent resin and the auxiliary light conversion layer is configured to convert a wavelength of light emitted from the LED chip. ### Claim 2 (depends on 1) The display device of claim 1, wherein the light conversion layer includes quantum dot particles configured to convert a wavelength of light emitted from the LED chip. ### Claim 3 (depends on 2) The display device of claim 2, wherein the LED chip is configured to emit blue-based light, wherein the light conversion layer includes a red quantum dot configured to convert blue-based light into red-based light and a green quantum dots configured to convert blue-based light into green-based light. ### Claim 4 (depends on 1) The display device of claim 1, wherein the transparent resin has a dome shape formed on the mounting surface and having the LED chip disposed therein. ### Claim 5 (depends on 4) The display device of claim 4, wherein the LED chip includes a light emitting surface on a side that the liquid crystal panel faces, and is configured to emit light, and a region of an outer circumferential surface of the transparent resin provided at a position corresponding to the light emitting surface in a direction the light emitting surface faces is spaced apart from the light emitting surface. ### Claim 6 (depends on 5) The display device of claim 5, wherein the light source plate further includes a Distributed Bragg reflector (DBR) layer disposed on the light emitting surface configured to provide a greater light directivity angle with respect to the liquid crystal panel to light emitted from the light emitting surface. ### Claim 7 (depends on 1) The display device of claim 1, wherein the light source plate further includes: a plurality of auxiliary light conversion layers disposed on the mounting surface inside the transparent resin and different sides of the LED chip, and wherein the plurality of auxiliary light conversion layers are configured to convert a wavelength of light emitted from the LED chip. ### Claim 8 (depends on 1) The display device of claim 1, wherein the auxiliary light conversion layer includes a fluorescent material. ### Claim 9 (depends on 8) The display device of claim 8, wherein the LED chip is configured to emit blue-based light, and the fluorescent material is configured to convert blue-based light into red and green-based light. ### Claim 10 (depends on 1) The display device of claim 1, wherein the auxiliary light conversion layer is coated on the mounting surface. ### Claim 11 (depends on 1) The display device of claim 1, wherein the LED chip is directly mounted on the mounting surface as a Chip On Board (COB). ### Claim 12 (depends on 1) The display device of claim 1, wherein the light conversion layer is disposed on and substantially surrounds the transparent resin. ### Claim 13 (depends on 12) The display device of claim 12, wherein the barrier layer has a size corresponding to a size of the printed circuit board, and substantially surrounds the light conversion layer in a direction in which the mounting surface of the printed circuit board faces. ### Claim 14 (depends on 1) The display device of claim 1, wherein the barrier layer has a size corresponding to a size of the printed circuit board, and substantially surrounds the transparent resin in a direction in which the mounting surface of the printed circuit board faces. ### Claim 15 (depends on 1) The display device of claim 1, wherein the light conversion layer and the barrier layer each have a size corresponding to a size of the printed circuit board, and at least partially overlap and match with each other in a direction in which the mounting surface of the printed circuit board faces, and are bonded to the printed circuit bound in a direction in which the mounting surface of the printed circuit board faces. ### Claim 16 (depends on 1) The display device of claim 1, wherein the auxiliary light conversion layer is configured to convert the wavelength of light emitted from the LED chip into a mixed light and the mixed light reflected from the auxiliary light conversion layer passes through the transparent resin and the light conversion layer. ### Claim 17 (depends on 1) The display device of claim 1, wherein the a portion of the light emitted from the LED chip is incident onto the light conversion layer in a state of being pre-converted by the auxiliary light conversion layer. ### Claim 18 A display device comprising: a liquid crystal panel; and a light source plate disposed behind at least the liquid crystal panel and configured to provide the liquid crystal panel with light, wherein the light source plate includes: a printed circuit board (PCB) comprising a mounting surface; a light emitting diode (LED) chip; a transparent resin disposed on at least the LED chip to substantially surround the LED chip; a light conversion layer configured to convert a wavelength of light emitted from the LED chip, the light conversion layer substantially surrounding an outer surface of the transparent resin; a barrier layer covering the light conversion layer from an outside; and an auxiliary light conversion layer at least partially inside the transparent resin and configured to convert a wavelength of light emitted from the LED chip, and wherein the device is configured so that light reflected from the auxiliary light conversion layer is to pass through the transparent resin and then pass through the light conversion layer.