# US 2021/0333459 A1 · Light guide plate, backlight module and display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0333459 A1 - Document ID: US20210333459A1 - Status: Published application - Kind: A1 - Application number: 16/332,263 - Filed: 2018-09-14 - Published: 2021-10-28 - Earliest claimed: 2017-09-19 - Assignees: Beijing Boe Display Technology Co., Ltd.; Boe Technology Group Co., Ltd. - Applicants: Beijing Boe Display Technology Co., Ltd.; Boe Technology Group Co., Ltd. - Inventors: Yonglian QI; Xue DONG; Huijuan WANG; Zezhou YANG; Hebin ZHAO; Lianjie QU; Shuai LIU - Web page: https://patentgrep.com/patent/US20210333459A1 ## CPC - G02B 6/0003: {the light guides being doped with fluorescent agents} - G02B 6/0051: {Diffusing sheet or layer} - G02B 6/0053: {Prismatic sheet or layer; Brightness enhancement element, sheet or layer} - G02B 6/0068: {Arrangements of plural sources, e.g. multi-colour light sources} - G02B 6/0073: {Light emitting diode [LED]} - G02F 1/133603: {with LEDs} - G02F 1/133606: {including a specially adapted diffusing, scattering or light controlling members} - G02F 1/133614: {using photoluminescence, e.g. phosphors illuminated by UV or blue light} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - 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 light guide plate, a backlight module and a display device are provided. A plurality of blind holes is arranged at a surface of the light guide plate; the blind hole is filled with a light-converting unit; the light-converting unit includes an accommodating cavity made of a light-transmitting material, and a light-converting material located in the accommodating cavity; and a gap is between an outer wall of the accommodating cavity and an inner wall of the blind hole. ## Claims ### Claim 1 A light guide plate, wherein, a plurality of blind holes is arranged at a first surface of the light guide plate, each of the plurality of blind holes is filled with a light-converting unit, the light-converting unit comprises an accommodating cavity made of a light-transmitting material, and a light-converting material located in the accommodating cavity, and a gap is between an outer wall of the accommodating cavity and an inner wall of each blind hole. ### Claim 2 (depends on 1) The light guide plate according to claim 1, wherein the light-converting material comprises at least one of a quantum dot material and a fluorescent material. ### Claim 3 (depends on 1) The light guide plate according to claim 1, wherein a diameter of each blind hole is in a range of 100 μm to 1000 μm, a depth of each blind hole is in a range of 100 μm to 1000 μm, and a diameter of the accommodating cavity is smaller than 100 μm. ### Claim 4 (depends on 1) The light guide plate according to claim 1, wherein the light-transmitting material comprises a glass or a transparent resin. ### Claim 5 (depends on 1) The light guide plate according to claim 1, wherein a plurality of diffusion dots is arranged on a light-entering surface of the light guide plate. ### Claim 6 (depends on 1) The light guide plate according to claim 1, wherein each blind hole is cylinder-like, and the accommodating cavity is truncated cone-like. ### Claim 7 (depends on 1) The light guide plate according to claim 1, wherein a refractive index of a medium filled into the gap is less than a refractive index of the light-converting material. ### Claim 8 (depends on 7) The light guide plate according to claim 7, wherein the medium in the gap is air. ### Claim 9 (depends on 1) The light guide plate according to claim 1, wherein the outer wall of the accommodating cavity is an inclined surface. ### Claim 10 (depends on 1) The light guide plate according to claim 1, wherein the first surface is a light-exiting surface or a light-entering surface of the light guide plate. ### Claim 11 A backlight module, comprising: a light guide plate, wherein a plurality of blind holes is arranged at a first surface of the light guide plate, each of the plurality of blind holes is filled with a light-converting unit, the light-converting unit comprises an accommodating cavity made of a light-transmitting material, and a light-converting material located in the accommodating cavity, and a gap is between an outer wall of the accommodating cavity and an inner wall of each blind hole; and a light source arranged on a side of a light-entering surface of the light guide plate and configured to excite the light-converting material to emit light. ### Claim 12 (depends on 11) The backlight module according to claim 11, wherein the light source comprises a LED (Light Emitting Diode) array, and each LED in the LED array corresponds to at least one light-converting unit. ### Claim 13 (depends on 12) The backlight module according to claim 12, wherein the LED array is arranged on a transparent substrate, and a light reflecting layer is arranged on a side of the transparent substrate facing away from the LED array. ### Claim 14 (depends on 11) The backlight module according to claim 11, further comprising: a light-shielding metal pattern located on the first surface of the light guide plate, wherein an orthographic projection of the light-shielding metal pattern onto the first surface overlaps with an orthographic projection of the light-converting unit onto the first surface. ### Claim 15 (depends on 14) The backlight module according to claim 14, further comprising at least one of a scattering film and a brightness enhancement film, wherein the scattering film and the brightness enhancement film are both located on a side of the light-shielding metal pattern facing away from the first surface of the light guide plate. ### Claim 16 (depends on 13) The backlight module according to claim 13, wherein each LED in the LED array is a blue LED. ### Claim 17 (depends on 11) A display device, comprising the backlight module according to claim 11. ### Claim 18 (depends on 11) The backlight module according to claim 11, wherein the light-converting material comprises at least one of a quantum dot material and a fluorescent material. ### Claim 19 (depends on 11) The backlight module according to claim 11, wherein a diameter of each blind hole is in a range of 100 μm to 1000 μm, a depth of each blind hole is in a range of 100 μm to 1000 μm, and a diameter of the accommodating cavity is smaller than 100 μm. ### Claim 20 (depends on 11) The backlight module according to claim 11, wherein the light-transmitting material comprises a glass or a transparent resin; each blind hole is cylinder-like, and the accommodating cavity is truncated cone-like; a refractive index of a medium filled into the gap is less than a refractive index of the light-converting material; the medium in the gap is air, and the outer wall of the accommodating cavity is an inclined surface; and the first surface is a light-exiting surface or the light-entering surface of the light guide plate.