# US 10,120,245 B2 · Liquid crystal display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,120,245 B2 - Document ID: US10120245B2 - Status: Granted - Kind: B2 - Application number: 15/349,032 - Filed: 2016-11-11 - Published: 2017-03-02 - Granted: 2018-11-06 - Earliest claimed: 2013-12-18 - Assignees: Japan Display Inc. - Applicants: Japan Display Inc. - Inventors: Takeyuki Tsuruma; Hidemasa Yamaguchi - Web page: https://patentgrep.com/patent/US10120245B2 ## CPC - G02F 1/134336: {Matrix} - G02F 1/133345: {Insulating layers (G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence)} - G02F 1/134363: {for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]} - G02F 1/1368: in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)} - G02F 1/134372: {for fringe field switching [FFS] where the common electrode is not patterned} - G02F 1/13439: {characterised by their electrical, optical, physical properties; materials therefor; method of making} - G02F 1/136227: {Through-hole connection of the pixel electrode to the active element through an insulation layer} - G02F 2201/123: pixel - G02F 2202/103: a-Si - 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 In order to increase the transmittance around a pixel and to increase the brightness of the screen in an IPS mode liquid crystal display device, a pixel electrode with a slit is formed on a common electrode through an interlayer insulating film. An opening is formed in the common electrode on the outside of the end portion of the pixel electrode as seen in a plane view. Because of the presence of the opening, the electric field lines from the end portion of the pixel electrode reach the layer above the liquid crystal layer and reach further away from the end portion of the pixel electrode, so that it is possible to increase the control ability to the liquid crystal around the pixel. As a result, the pixel transmittance can be increased as a whole and the brightness of the screen can be increased. ## Claims ### Claim 1 A display device comprising: a TFT substrate having scanning lines extending in a first direction, video signal lines extending in a second direction crossing the first direction, a first electrode overlapped with the scanning lines and the video signal lines, an insulating film formed on the first electrode, and a second electrode formed on the insulating film overlapping with the first electrode; and a counter substrate opposed to the TFT substrate; wherein the second electrode is formed in an area surrounded by the scanning lines and the video lines, the first electrode has an opening formed in the area, the opening is formed along the second electrode and an edge of the opening in the first direction is apart from the second electrode, in a plan view, and the edge of the opening is between the second electrode and the video signal lines, in a plan view. ### Claim 2 (depends on 1) The display device according to claim 1, wherein the distance is in the range of 0.25 μm to 5 μm. ### Claim 3 (depends on 1) The display device according to claim 1, wherein the distance is in the range of 0.5 μm to 3 μm. ### Claim 4 (depends on 1) The display device according to claim 1, wherein the opening does not overlap the video signal line as seen in a plan view. ### Claim 5 (depends on 1) The display device according to claim 1, wherein the opening does not overlap the scanning line as seen in a plan view. ### Claim 6 (depends on 1) The display device according to claim 1, wherein the opening is formed between the video signal line and the second electrode, wherein a part of the opening overlaps with the second electrode. ### Claim 7 (depends on 1) The display device according to claim 1, wherein the second electrode is a line shape electrode and does not have a slit. ### Claim 8 (depends on 1) The display device according to claim 1, wherein the opening does not overlap with the second electrode, in a plan view. ### Claim 9 (depends on 8) The display device according to claim 8, wherein the opening includes a first opening and a second opening, and the second electrode is between the first opening and the second opening, in a plan view. ### Claim 10 (depends on 9) The display device according to claim 9, wherein the second electrode opposes to the first electrode between the first opening and the second opening. ### Claim 11 (depends on 1) The display device according to claim 1, wherein the TFT substrate has a thin film transistor in the area, and the second electrode is connected to the thin film transistor through a through hole. ### Claim 12 (depends on 11) The display device according to claim 11, wherein the first electrode has a hole corresponding to the through hole, and the hole and the opening are not connected.