# US 11,442,327 B2 · Display panel > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,442,327 B2 - Document ID: US11442327B2 - Status: Granted - Kind: B2 - Application number: 16/644,935 - Filed: 2020-01-08 - Published: 2021-12-30 - Granted: 2022-09-13 - Earliest claimed: 2019-12-23 - Assignees: Tcl China Star Optoelectronics Technology Co., Ltd. - Applicants: TCL China Star Optoelectronics Technology Co., Ltd. - Inventors: Xingwu Chen - Web page: https://patentgrep.com/patent/US11442327B2 ## CPC - G02F 1/167: by electrophoresis - G02F 1/16755: Substrates - G02F 1/1676: Electrodes - G02F 1/1681: having two or more microcells partitioned by walls, e.g. of microcup type - G02F 1/16762: having three or more electrodes per pixel - G02F 2201/50: Protective arrangements - 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 An embodiment of the present application provides a display panel including a first substrate, a second substrate, barrier walls, and an electrophoretic material. The second substrate is disposed opposite to the first substrate, and the second substrate includes a substrate layer, a metal layer, a first protective layer, a nanoparticle layer, and a second protective layer arranged in a stack. The second protective layer is disposed on a side of the second substrate facing the first substrate. The barrier walls are disposed between the first substrate and the second substrate, a plurality of receiving spaces are defined by the barrier walls, the first substrate, and the second substrate, and the electrophoretic material is contained in each of the receiving spaces. ## Claims ### Claim 1 A display panel, comprising: a first substrate; a second substrate disposed opposite to the first substrate, wherein the second substrate comprises a substrate layer, a metal layer, a first protective layer, a nanoparticle layer, and a second protective layer arranged in a stack, and the second protective layer is disposed on a side of the second substrate facing the first substrate; a plurality of barrier walls disposed between the first substrate and the second substrate, wherein a plurality of receiving spaces are defined by the barrier walls, the first substrate, and the second substrate; an electrophoretic material contained in each of the receiving spaces; wherein the nanoparticle layer comprises metal nanoparticles distributed in an array; wherein the metal nanoparticles are configured to generate a structural color by plasma resonance with a metal in the metal layer, so that the second substrate reflects visible light; and wherein each of the receiving spaces comprises a plurality of first accommodation spaces, a plurality of second accommodation spaces, or a plurality of third accommodation spaces, a gap positioned between adjacent metal nanoparticles in each of the first accommodation spaces is a first pitch, a gap positioned between adjacent metal nanoparticles in each of the second accommodation spaces is a second pitch, and a gap positioned between adjacent metal nanoparticles in each of the third accommodation spaces is a third pitch, the first pitch is different from the second pitch, the first pitch is different from the third pitch, and the second pitch is different from the third pitch. ### Claim 2 (depends on 1) The display panel according to claim 1, wherein the electrophoretic material comprises an electrophoretic liquid and electrophoretic particles, and the electrophoretic particles are black charged particles. ### Claim 3 (depends on 2) The display panel according to claim 2, wherein a material of the barrier walls is a hydrophobic material, and the electrophoretic particles are particles having a hydrophobic surface. ### Claim 4 (depends on 2) The display panel according to claim 2, wherein a material of the barrier walls is a hydrophilic material, and the electrophoretic particles are particles having a hydrophilic surface. ### Claim 5 (depends on 2) The display panel according to claim 2, wherein the electrophoretic particles are configured to move toward the first substrate under an action of an electric field, so that the display panel is in a dark state. ### Claim 6 (depends on 2) The display panel according to claim 2, wherein the electrophoretic particles are configured to adsorb onto the barrier walls, so that the display panel is in a reflective state. ### Claim 7 (depends on 1) The display panel according to claim 1, further comprising a plurality of first electrodes and a plurality of second electrodes, wherein the first electrodes are disposed on the first substrate, and the second electrodes are disposed on the second substrate. ### Claim 8 (depends on 7) The display panel according to claim 7, wherein each of the first electrodes is a transparent electrode, the first electrodes cover a side of the first substrate facing the second substrate and are disposed between the barrier walls, and the second electrodes are disposed at a plurality of corners formed by the second substrate and the barrier walls. ### Claim 9 (depends on 8) The display panel according to claim 8, wherein the first electrode is configured to apply a voltage opposite to a polarity of the electrophoretic particles to the electrophoretic particles to make the electrophoretic particles move toward the first substrate, so that the display panel is in a dark state; and the second electrode is configured to apply a voltage opposite to a polarity of the electrophoretic particles to the electrophoretic particles to make the electrophoretic particles move toward the corners formed by the second substrate and the barrier walls, so that the display panel returns to a reflective state from the dark state. ### Claim 10 (depends on 1) The display panel according to claim 1, wherein each of the first accommodation spaces is a red region, each of the second accommodation spaces is a green region, and each of the third accommodation spaces is a blue region. ### Claim 11 (depends on 1) The display panel according to claim 1, wherein a material of the metal nanoparticles comprises magnesium, aluminum, molybdenum, copper, silver, or titanium. ### Claim 12 (depends on 1) The display panel according to claim 1, wherein a size of each of the metal nanoparticles ranges from 3 nanometers to 200 nanometers. ### Claim 13 (depends on 1) The display panel according to claim 1, wherein a gap between adjacent metal nanoparticles in the nanoparticle layer ranges from 3 nanometers to 400 nanometers. ### Claim 14 (depends on 1) The display panel according to claim 1, wherein the electrophoretic material is electronic ink. ### Claim 15 (depends on 1) The display panel according to claim 1, wherein a material of the metal layer comprises magnesium, aluminum, molybdenum, copper, silver, or titanium. ### Claim 16 (depends on 1) The display panel according to claim 1, wherein a material of the first protective layer comprises aluminum oxide, silicon nitride, or silicon oxide. ### Claim 17 (depends on 1) The display panel according to claim 1, wherein a material of the second protective layer is aluminum oxide, silicon nitride, or silicon oxide.