# US 8,570,271 B2 · Electronic paper display device and manufacturing method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,570,271 B2 - Document ID: US8570271B2 - Status: Granted - Kind: B2 - Application number: 12/643,823 - Filed: 2009-12-21 - Published: 2011-03-17 - Granted: 2013-10-29 - Earliest claimed: 2009-09-14 - Assignees: Samsung Electro-Mechancis Co., Ltd. - Applicants: Sang Moon Lee; Hwan-Soo Lee; Young Woo Lee; Jeong Bok Kwak - Inventors: Sang Moon Lee; Hwan-Soo Lee; Young Woo Lee; Jeong Bok Kwak - Web page: https://patentgrep.com/patent/US8570271B2 ## CPC - G02F 1/167: by electrophoresis - G02B 26/026: {based on the rotation of particles under the influence of an external field, e.g. gyricons, twisting ball displays (based on orientable dipolar particles G02F1/172; based on electrophoresis G02F1/167)} - G02F 1/16757: Microcapsules - G09F 9/372: {the positions of the elements being controlled by the application of an electric field} - G02F 1/1681: having two or more microcells partitioned by walls, e.g. of microcup type - 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 - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS ## Abstract There is provided an electronic paper display device and a manufacturing method thereof. The electronic paper display device includes a first electrode formed of a transparent material; at least one or more second electrodes disposed to face the first electrode with differing gaps therebetween; and at least one or more display units disposed between the first and second electrodes and having optical properties varied according to voltage applied to the first and second electrodes. The display units are disposed between the first electrode and the second electrodes disposed to face the first electrode with differing gaps, so respective rotation amounts or rotation angles of the display units become different when the same magnitude of voltage is applied. Accordingly, a wide range of contrast levels is displayed. ## Claims ### Claim 1 An electronic paper display device comprising: a first electrode formed of a transparent material; at least one or more second electrodes disposed to face the first electrode with differing gaps therebetween; and at least one or more display units disposed between the first and second electrodes and having optical properties varied according to voltage applied to the first and second electrodes; wherein, for each of the one or more second electrodes, the gap between the first electrode and the second electrode is substantially the same across the gap. ### Claim 2 (depends on 1) The electronic paper display device of claim 1, wherein the second electrodes are formed on a lower structure including at least one or more stepped parts having different heights. ### Claim 3 (depends on 1) The electronic paper display device of claim 1, wherein the first electrode is formed on a first substrate formed of a light-transmitting material. ### Claim 4 (depends on 1) The electronic paper display device of claim 1, wherein the first and second electrodes have a plurality of partitions provided therebetween in order to accommodate the display units. ### Claim 5 (depends on 1) The electronic paper display device of claim 1, wherein two or more of the display units, disposed on two or more of the second electrodes facing the first electrode with differing gaps therebetween, form a single pixel. ### Claim 6 (depends on 1) The electronic paper display device of claim 1, wherein the display units comprise rotatable balls having two display areas having different colors and different electrical charge properties. ### Claim 7 (depends on 6) The electronic paper display device of claim 6, wherein the rotatable balls have a shape of a sphere, an oval-shaped sphere or a cylinder. ### Claim 8 (depends on 1) The electronic paper display device of claim 1, wherein the display units comprise microcapsules having transparent fluid including two types of charged particles sealed therein, the charged particles being spread in the transparent fluid and having different electrical charge properties. ### Claim 9 (depends on 1) The electronic paper display device of claim 1, wherein the display units comprise transparent fluid and two types of charged particles spread in the transparent fluid and having different electrical charge properties. ### Claim 10 A method of manufacturing an electronic paper display device, the method comprising: forming a lower structure having at least one or more stepped parts having different heights; forming at least one or more first electrodes on the stepped parts; disposing display units on the first electrodes; and forming a second electrode disposed to face the first electrodes and covering the display units; wherein, for each of the one or more first electrodes, a gap formed between the first electrode and the second electrode is substantially the same across the gap. ### Claim 11 (depends on 10) The method of claim 10, further comprising forming partitions to accommodate the display units on the lower structure. ### Claim 12 (depends on 10) The method of claim 10, wherein the lower structure is formed by implanting, injection molding, laser patterning, or photolithography.