# US 10,503,001 B2 · Display 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 10,503,001 B2 - Document ID: US10503001B2 - Status: Granted - Kind: B2 - Application number: 16/027,972 - Filed: 2018-07-05 - Published: 2019-03-21 - Granted: 2019-12-10 - Earliest claimed: 2017-09-20 - Assignees: Boe Technology Group Co., Ltd. - Applicants: BOE Technology Group Co., Ltd. - Inventors: Yafeng Yang; Wei Wang; Xiaochuan Chen; Xue Dong; Jifeng Tan; Xianqin Meng; Xiandong Meng - Web page: https://patentgrep.com/patent/US10503001B2 ## CPC - G02F 1/133504: {Diffusing, scattering, diffracting elements (associated to illuminating devices G02F1/133606)} - G02F 1/133345: {Insulating layers (G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence)} - G02F 1/133514: {Colour filters} - G02F 1/13439: {characterised by their electrical, optical, physical properties; materials therefor; method of making} - G02F 1/134381: {Hybrid switching mode, i.e. for applying an electric field with components parallel and orthogonal to the substrates} - G02F 1/13706: {the liquid crystal having positive dielectric anisotropy} - G02F 2201/30: grating - 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 The display module includes a first substrate, a second substrate, a first electrode, a liquid crystal layer, a second electrode, and a plurality of gratings and drive electrodes, wherein the liquid crystal layer includes only positive liquid crystal molecules; both a refractive index of the first electrode and a refractive index of the first substrate are greater than a normal refractive index no of liquid crystal in the liquid crystal layer; and a refractive index of each of the plurality of gratings lies between the normal refractive index no and an abnormal refractive index ne of the liquid crystal. ## Claims ### Claim 1 A display module, comprising a first substrate and a second substrate, both of which are cell-assembled with each other, and a first electrode, a liquid crystal layer, and a second electrode arranged between the first substrate and the second substrate in that order, wherein: the display module further comprises a plurality of gratings distributed in an array on a surface of the first electrode on a side thereof facing the liquid crystal layer, and drive electrodes arranged respectively on sides of respective gratings facing away from the first electrode; the liquid crystal layer comprises only positive liquid crystal molecules; both a refractive index of the first electrode and a refractive index of the first substrate are greater than a normal refractive index no of liquid crystal in the liquid crystal layer; and a refractive index of each of the plurality of gratings lies between the normal refractive index no and an abnormal refractive index ne of the liquid crystal. ### Claim 2 (depends on 1) The display module according to claim 1, wherein the liquid crystal is blue-phase liquid crystal. ### Claim 3 (depends on 1) The display module according to claim 1, wherein the refractive index of the first electrode is greater or less than the refractive index of the first substrate. ### Claim 4 (depends on 1) The display module according to claim 1, wherein the display module further comprises a first insulation layer arranged on the surface of the first electrode on the side thereof facing the liquid crystal layer, and a second insulation layer arranged on a surface of the second electrode on a side thereof facing the liquid crystal layer; the plurality of gratings are arranged on a surface of the first insulation layer on a side thereof facing the liquid crystal layer. ### Claim 5 (depends on 4) The display module according to claim 4, wherein both a refractive index of the first insulation layer and a refractive index of the second insul ation layer are greater than the normal refractive index no of the liquid crystal. ### Claim 6 (depends on 1) The display module according to claim 1, wherein a length of each of the plurality of gratings is equal to a length of a corresponding drive electrode, and the length of each of the plurality of gratings is equal to a transverse spacing between adjacent gratings, along a row direction of the plurality of gratings; and a width of each of the plurality of gratings is equal to a width of a corresponding drive electrode, and the width of each of the plurality of gratings is equal to a longitudinal spacing between adjacent gratings, along a column direction of the plurality of gratings. ### Claim 7 (depends on 1) The display module according to claim 1, wherein a thickness of each of the plurality of gratings ranges from 200 nm to 1000 nm along a direction from the first substrate to the second substrate. ### Claim 8 (depends on 1) The display module according to claim 1, wherein all of the first electrode, the second electrode, and the drive electrodes are made of a transparent conductive material. ### Claim 9 (depends on 1) The display module according to claim 1, wherein the first electrode is a plate-shaped electrode, and has a thickness ranging from 100 nm to 1000 nm; and the second electrode is a plate-shaped electrode. ### Claim 10 (depends on 1) The display module according to claim 1, wherein the display module further comprises a first protection layer arranged on a surface of the first substrate on a side thereof facing away from the second substrate, and a second protection layer arranged on a surface of the second substrate on a side thereof facing away from the first substrate. ### Claim 11 (depends on 1) The display module according to claim 1, wherein the first substrate is an array substrate and the second substrate is a color filter substrate; or the first substrate is the color filter substrate, and the second substrate is the array substrate. ### Claim 12 A display device, comprising a display module, wherein the display module comprises a first substrate and a second substrate, both of which are cell-assembled with each other, and a first electrode, a liquid crystal layer, and a second electrode arranged between the first substrate and the second substrate in that order, wherein: the display module further comprises a plurality of gratings distributed in an array on a surface of the first electrode on a side thereof facing the liquid crystal layer, and drive electrodes arranged respectively on sides of respective gratings facing away from the first electrode; the liquid crystal layer comprises only positive liquid crystal molecules; both a refractive index of the first electrode and a refractive index of the first substrate are greater than a normal refractive index no of liquid crystal in the liquid crystal layer; and a refractive index of each of the plurality of gratings lies between the normal refractive index no and an abnormal refractive index ne of the liquid crystal. ### Claim 13 (depends on 12) The display device according to claim 12, wherein the liquid crystal is blue-phase liquid crystal. ### Claim 14 (depends on 12) The display device according to claim 12, wherein the refractive index of the first electrode is greater or less than the refractive index of the first substrate. ### Claim 15 (depends on 12) The display device according to claim 12, wherein the display module further comprises a first insulation layer arranged on the surface of the first electrode on the side thereof facing the liquid crystal layer, and a second insulation layer arranged on a surface of the second electrode on a side thereof facing the liquid crystal layer; the plurality of gratings are arranged on a surface of the first insulation layer on a side thereof facing the liquid crystal layer. ### Claim 16 (depends on 15) The display device according to claim 15, wherein both a refractive index of the first insulation layer and a refractive index of the second insulation layer are greater than the normal refractive index no of the liquid crystal. ### Claim 17 (depends on 12) The display device according to claim 12, wherein a length of each of the plurality of gratings is equal to a length of a corresponding drive electrode, and the length of each of the plurality of gratings is equal to a transverse spacing between adjacent gratings, along a row direction of the plurality of gratings; and a width of each of the plurality of gratings is equal to a width of a corresponding drive electrode, and the width of each of the plurality of gratings is equal to a longitudinal spacing between adjacent gratings, along a column direction of the plurality of gratings. ### Claim 18 (depends on 12) The display device according to claim 12, wherein a thickness of each of the plurality of gratings ranges from 200 nm to 1000 nm along a direction from the first substrate to the second substrate. ### Claim 19 (depends on 12) The display device according to claim 12, wherein the first electrode is a plate-shaped electrode, and has a thickness ranging from 100 nm to 1000 nm; and the second electrode is a plate-shaped electrode. ### Claim 20 (depends on 12) The display device according to claim 12, wherein the first substrate is an array substrate and the second substrate is a color filter substrate; or the first substrate is the color filter substrate, and the second substrate is the array substrate.