# US 12,007,638 B2 · Display panel and preparation method thereof, 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 12,007,638 B2 - Document ID: US12007638B2 - Status: Granted - Kind: B2 - Application number: 17/622,728 - Filed: 2021-12-15 - Published: 2024-02-01 - Granted: 2024-06-11 - Earliest claimed: 2021-12-07 - Assignees: Wuhan China Star Optoelectronics Technology Co., Ltd. - Applicants: Wuhan China Star Optoelectronics Technology Co., Ltd. - Inventors: Qian Deng; Rui He; Wei Cheng - Web page: https://patentgrep.com/patent/US12007638B2 ## CPC - G02F 1/1334: based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals - G02F 1/1336: {Illuminating devices} - G02F 1/134309: {characterised by their geometrical arrangement} - 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 Embodiments of the present application disclose a display panel and a preparation method thereof, and a display device. The display panel comprises a polymer liquid crystal cell and a light source. The polymer liquid crystal cell comprises a first region close to the light source and a second region away from the light source, and the second region has a higher haze than the first region, thereby reducing the light emitting intensity close to the light source region and increasing the light emitting intensity away from the light source region, so that light guide and light emitting in each region of the polymer liquid crystal cell uniform. ## Claims ### Claim 1 A display panel, comprising: a polymer liquid crystal cell comprising a polymer dispersed liquid crystal; and a light source disposed outside of at least one side end of the polymer liquid crystal cell; wherein the polymer liquid crystal cell comprises a first region close to the light source and a second region away from the light source, and the second region has a higher haze than the first region; and wherein droplet size of the polymer dispersed liquid crystal in the second region is smaller than droplet size of the polymer dispersed liquid crystal in the first region, and droplet number of the polymer dispersed liquid crystal in the second region is larger than droplet number of the polymer dispersed liquid crystal in the first region. ### Claim 2 (depends on 1) The display panel according to claim 1, wherein a haze gradually increases from the first region to the second region. ### Claim 3 (depends on 1) The display panel according to claim 1, wherein the polymer liquid crystal cell comprises a first side end and a second side end, the first side end and the second side end are disposed opposite to each other, the light source is disposed outside the first side end, and the second region corresponds to the second side end. ### Claim 4 (depends on 1) The display panel according to claim 1, wherein the polymer liquid crystal cell comprises a first side end and a second side end, the first side end and the second side end are disposed opposite to each other, the light source is disposed outside the first side end and outside the second side end, and the second region corresponds to an intermediate portion between the first side end and the second side end. ### Claim 5 (depends on 1) The display panel according to claim 1, wherein a haze of the polymer dispersed liquid crystal in the first region of the polymer liquid crystal cell ranges from 20% to 60%, and a haze of the polymer dispersed liquid crystal in the second region of the polymer liquid crystal cell ranges from 80% to 95%. ### Claim 6 (depends on 1) The display panel according to claim 1, wherein the polymer liquid crystal cell comprises a first substrate, a second substrate, a first electrode layer disposed on the first substrate, and a second electrode layer disposed on the second substrate, the first electrode layer and the second electrode layer are disposed opposite to each other in the polymer liquid crystal cell, and the polymer dispersed liquid crystal is sandwiched between the first electrode layer and the second electrode layer. ### Claim 7 (depends on 6) The display panel according to claim 6, wherein the display panel is a transparent display panel, and the light source comprises at least a plurality of red sub-light sources, a plurality of green sub-light sources, and a plurality of blue sub-light sources; and the polymer liquid crystal cell comprises a plurality of sub-pixels, each sub-pixel comprises a plurality of pixel electrodes located on the first electrode layer or the second electrode layer. ### Claim 8 A display device, comprising a display liquid crystal cell and a display panel, wherein the display panel comprises: a polymer liquid crystal cell comprising a polymer dispersed liquid crystal; a light source disposed outside of at least one side end of the polymer liquid crystal cell; wherein the polymer liquid crystal cell comprises a first region close to the light source and a second region away from the light source, and the second region has a higher haze than the first region; and wherein droplet size of the polymer dispersed liquid crystal in the second region is smaller than droplet size of the polymer dispersed liquid crystal in the first region, and droplet number of the polymer dispersed liquid crystal in the second region is larger than droplet number of the polymer dispersed liquid crystal in the first region; and wherein the display liquid crystal cell is located on one side of the polymer liquid crystal cell. ### Claim 9 (depends on 8) The display device according to claim 8, wherein a haze gradually increases from the first region to the second region. ### Claim 10 (depends on 8) The display device according to claim 8, wherein the polymer liquid crystal cell comprises a first side end and a second side end, the first side end and the second side end are disposed opposite to each other, the light source is disposed outside the first side end, and the second region corresponds to the second side end. ### Claim 11 (depends on 8) The display device according to claim 8, wherein the polymer liquid crystal cell comprises a first side end and a second side end, the first side end and the second side end are disposed opposite to each other, the light source is disposed outside the first side end and outside the second side end, and the second region corresponds to an intermediate portion between the first side end and the second side end. ### Claim 12 (depends on 8) The display device according to claim 8, wherein a haze of the polymer dispersed liquid crystal in the first region of the polymer liquid crystal cell ranges from 20% to 60%, and a haze of the polymer dispersed liquid crystal in the second region of the polymer liquid crystal cell ranges from 80% to 95%. ### Claim 13 A method of preparing a display panel, wherein the method comprises: step S100: providing a patterned mask plate, wherein a first portion of the mask plate has a smaller ultraviolet light transmittance than a second portion of the mask plate; step S200: providing a polymer liquid crystal cell comprising a polymer dispersed liquid crystal; step S300: aligning the mask plate with the polymer liquid crystal cell, wherein the first portion of the mask plate corresponds to a first region of the polymer liquid crystal cell, and the second portion of the mask plate corresponds to a second region of the polymer liquid crystal cell; allowing droplet size of the polymer dispersed liquid crystal in the second region to be smaller than droplet size of the polymer dispersed liquid crystal in the first region, and allowing droplet number of the polymer dispersed liquid crystal in the second region to be larger than droplet number of the polymer dispersed liquid crystal in the first region; step S400: irradiating the polymer liquid crystal cell with an ultraviolet light through the mask plate, wherein the polymer dispersed liquid crystal in the polymer liquid crystal cell is subjected to reactions of separating of liquid crystal from a polymer phase and curing, so that the second region has a higher haze than the first region; and step S500: providing a light source, and disposing the light source outside a first side end of the polymer liquid crystal cell, and the first side end corresponds to the first region. ### Claim 14 (depends on 13) The method according to claim 13, wherein in the step S100, an ultraviolet light transmittance gradually increases from the first portion to the second portion; and in the step S400, a haze gradually increases from the first region to the second region. ### Claim 15 (depends on 14) The method according to claim 14, wherein in the step S500, the polymer liquid crystal cell comprises a second side end disposed opposite to the first side end portion, and the second region is located at the second side end. ### Claim 16 (depends on 14) The method according to claim 14, wherein in the step S500, the polymer liquid crystal cell comprises a first side end and a second side end, the first side end and the second side end are disposed opposite to each other, the light source is disposed outside the first side end and outside the second side end, and the second region corresponds to an intermediate portion between the first side end and the second side end. ### Claim 17 (depends on 15) The method according to claim 15, wherein the mask plate is prepared by a following method: step S1110: providing a transparent substrate; step S1120: forming a film medication on the transparent substrate; step S1130: exposing the film medication with an exposure illuminance gradually decreasing from the first portion to the second portion; and step S1140: developing the film medication, so that an ultraviolet light transmittance of the film medication decreases gradually from the second portion to the first portion. ### Claim 18 (depends on 15) The method according to claim 15, wherein the mask plate is prepared by a following method: step S1210: providing a substrate; step S1220: forming a metal layer on the substrate; and step S1230: patterning the metal layer by a nanoimprinting method to form a metal wire grid polarizer, direction of metal wire grid of the metal wire grid polarizer gradually changes from a first direction of the first portion to a second direction of the second portion, the first portion corresponds to the first region, the second portion corresponds to the second region, and the first direction intersects the second direction. ### Claim 19 (depends on 18) The method according to claim 18, wherein when the metal wire grid polarizer is irradiated with a polarized ultraviolet light, transmittance of the metal wire grid polarizer gradually increases from the first portion to the second portion. ### Claim 20 (depends on 15) The method according to claim 15, wherein the mask plate comprises a small hole or a slit, and the small hole or the slit is provided corresponding to the second portion.