# US 7,609,347 B2 · Liquid crystal display and method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,609,347 B2 - Document ID: US7609347B2 - Status: Granted - Kind: B2 - Application number: 11/862,567 - Filed: 2007-09-27 - Published: 2008-04-03 - Granted: 2009-10-27 - Earliest claimed: 2006-09-28 - Assignees: Samsung Electronics Co., Ltd. - Inventors: Jeong-Ho Lee; Min-Wook Park - Web page: https://patentgrep.com/patent/US7609347B2 ## CPC - G02F 1/133707: {Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes} - G02F 1/1343: Electrodes {(reflective electrodes G02F1/133553)} - G02F 2201/122: having a particular pattern - 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 A liquid crystal display (“LCD”) includes a first substrate, a second substrate, and a liquid crystal layer interposed between the first and second substrates. A pixel electrode is formed on the first substrate and provided with a first domain divider. A common electrode is formed on the second substrate and provided with a second domain divider. The second domain divider extends in a first direction and a second direction symmetric with the first direction in order to have a curved portion of the second domain divider. The common electrode has a concavo-convex portion in a saw-toothed shape in a plan view of the common electrode, and the concavo-convex portion is positioned in a region where the curved portion is formed. ## Claims ### Claim 1 A liquid crystal display comprising: a first substrate having a pixel area; a second substrate facing the first substrate; a liquid crystal layer interposed between the first and second substrates; a gate line and a data line arranged on the first substrate and crossing each other; a pixel electrode arranged in the pixel area and provided with a first domain divider; and a common electrode arranged on the second substrate and provided with a second domain divider, the first and second domain dividers dividing the pixel area into a plurality of domains, wherein the second domain divider extends in a first direction and a second direction symmetric with the first direction with respect to a longitudinal direction of the gate line in order to have a curved portion of the second domain divider, the common electrode has a concavo-convex portion in a saw-toothed shape in a plan view of the common electrode, and the concavo-convex portion is positioned in a region where the curved portion is formed. ### Claim 2 (depends on 1) The liquid crystal display of claim 1, wherein the concavo-convex portion is formed in a region where an included angle between the first direction and the second direction is greater than 180 degrees. ### Claim 3 (depends on 1) The liquid crystal display of claim 1, wherein the first domain divider is spaced apart from the second domain divider and portions of the first domain divider extend substantially parallel to portions of the second domain divider in order to have a curved portion of the first domain divider, the pixel electrode has a concavo-convex portion in a saw-toothed shape in a plan view of the pixel electrode, and the concavo-convex portion is positioned corresponding to the curved portion of the first domain divider. ### Claim 4 (depends on 3) The liquid crystal display of claim 3, wherein the concavo-convex portion of the common electrode and the concavo-convex portion of the pixel electrode are formed in a region where an included angle between the first direction and the second direction is greater than 180 degrees. ### Claim 5 (depends on 3) The liquid crystal display of claim 3, wherein the concavo-convex portion of the common electrode and the concavo-convex portion of the pixel electrode are alternately arranged with each other. ### Claim 6 (depends on 3) The liquid crystal display of claim 3, wherein the concavo-convex portion of the common electrode and the concavo-convex portion of the pixel electrode are arranged to an end portion of the first and second domain dividers, respectively. ### Claim 7 (depends on 3) The liquid crystal display of claim 3, wherein the saw-toothed shape of the concavo-convex portion of the common electrode and the concavo-convex portion of the pixel electrode is protruded toward a direction substantially perpendicular to the first direction in a region where the first and second domain dividers extend in the first direction and is substantially perpendicular to the second direction in a region where the first and second domain dividers extend in the second direction. ### Claim 8 (depends on 3) The liquid crystal display of claim 3, wherein the pixel electrode extends in the first and second directions and is curved in a curved region where a first extending portion of the pixel electrode in the first direction meets a second extending portion of the pixel electrode in the second direction. ### Claim 9 (depends on 8) The liquid crystal display of claim 8, wherein the concavo-convex portion of the pixel electrode is positioned corresponding to the curved region of the pixel electrode. ### Claim 10 (depends on 1) The liquid crystal display of claim 1, further comprising a storage electrode spaced apart from the gate line and overlapped with the curved portion in a plan view of the liquid crystal display. ### Claim 11 (depends on 10) The liquid crystal display of claim 10, further comprising a first transparent insulating layer pattern arranged between the data line and the pixel electrode, and partially opened in an area corresponding to the storage electrode. ### Claim 12 (depends on 11) The liquid crystal display of claim 11, wherein the concavo-convex portion is successively formed along an area corresponding to the storage electrode to an area corresponding to an end portion of the storage electrode. ### Claim 13 (depends on 11) The liquid crystal display of claim 11, wherein the first domain divider is spaced apart from the second domain divider and portions of the first domain divider extend substantially parallel to portions of the second domain divider in order to have a curved portion of the first domain divider, and the pixel electrode has a concavo-convex portion in a saw-toothed shape in a plan view of the pixel electrode, and the concavo-convex portion of the pixel electrode is positioned corresponding to the curved portion of the first domain divider. ### Claim 14 (depends on 13) The liquid crystal display of claim 13, wherein the concavo-convex portion of the pixel electrode is successively formed along an area corresponding to the storage electrode to an area corresponding to an end portion of the storage electrode. ### Claim 15 (depends on 11) The liquid crystal display of claim 11, further comprising a second transparent insulating layer pattern arranged between the storage electrode and the first transparent insulating layer pattern to cover the storage electrode. ### Claim 16 (depends on 15) The liquid crystal display of claim 15, wherein the first transparent insulating layer pattern is thicker than the second transparent insulating layer pattern and comprises an organic material, and the second transparent insulating layer pattern comprises an inorganic material. ### Claim 17 (depends on 1) The liquid crystal display of claim 1, wherein the first domain divider is defined by a cut-out section obtained by removing a portion of the pixel electrode. ### Claim 18 (depends on 17) The liquid crystal display of claim 17, wherein the second domain divider is defined by a cut-out section obtained by removing a portion of the common electrode. ### Claim 19 (depends on 17) The liquid crystal display of claim 17, wherein the second domain divider is defined by a protrusion formed on a portion of the common electrode. ### Claim 20 A method of improving a viewing angle of a liquid crystal display, the method comprising: forming a first domain divider in a pixel electrode; forming a second domain divider in a common electrode, the second domain divider spaced from the first domain divider in a plan view of the liquid crystal display, the second domain divider having a first portion extending in a first direction and a second portion extending in a second direction, the second portion meeting the first portion at a curved portion of the second domain divider; forming a concavo-convex portion in the common electrode at least at a region corresponding to the curved portion of the second domain divider; wherein a convex portion of the concavo-convex portion supplements a controlling force of the second domain divider over liquid crystals in the liquid crystal display and a concave portion of the concavo-convex portion increases an aperture ratio of the liquid crystal display.