# US 7,609,332 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 7,609,332 B2 - Document ID: US7609332B2 - Status: Granted - Kind: B2 - Application number: 11/827,993 - Filed: 2007-07-13 - Published: 2007-11-22 - Granted: 2009-10-27 - Earliest claimed: 2000-09-08 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Inventors: Yoshiharu Hirakata; Yuriko Hamamoto; Rumo Satake - Web page: https://patentgrep.com/patent/US7609332B2 ## CPC - G02F 1/136209: {Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element} - G02F 1/1333: Constructional arrangements; {Manufacturing methods}(G02F1/135, G02F1/136 take precedence) - G02F 1/133707: {Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes} - G02F 1/13373: {Disclination line; Reverse tilt} - G02F 1/133776: {having structures locally influencing the alignment, e.g. unevenness} - G02F 1/134336: {Matrix} - 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 Disclination of an active matrix liquid crystal display device is reduced. Portions of pixel electrodes are formed so as to mutually overlap with a convex portion. If the height of the convex portion is too tall, the amount of light leakage increases due to liquid crystals orienting diagonally with respect to a substrate surface. (See FIG. 1C.) If the height of the convex portion is low, the disclination reduction effect is low. The optimal convex portion height is thus determined. ## Claims ### Claim 1 A liquid crystal display device comprising: at least one semiconductor layer over a substrate; a gate insulating film over the at least one semiconductor layer; a gate electrode over the gate insulating film; an insulating film over the gate electrode; at least one gate wiring over the insulating film, and overlapping a portion of the at least one semiconductor layer; at least one source wiring over the substrate; at least one convex portion overlapping with the at least one of the at least one gate wiring and the at least one source wiring; and at least one pixel electrode partially overlapping with, and provided over the at least one convex portion. ### Claim 2 A liquid crystal display device comprising: at least one semiconductor layer over a substrate; a gate insulating film over the at least one semiconductor layer; a gate electrode over the gate insulating film; an insulating film over the gate electrode; at least one gate wiring over the insulating film, and overlapping a portion of the at least one semiconductor layer; at least one source wiring over the substrate; at least one convex portion having a first height overlapping with the at least one gate wiring; at least one convex portion having a second height overlapping with the at least one source wiring; and at least one pixel electrode partially overlapping with, and provided over the at least one convex portion having the first height and the at least one convex portion having the second height. ### Claim 3 (depends on 1) A liquid crystal display device according to claim 1, wherein the at least one convex portion comprises a film selected from the group consisting of a photosensitive organic resin film, an organic resin film, a silicon oxide film, a silicon nitride film and a silicon oxynitride film. ### Claim 4 (depends on 2) A liquid crystal display device according to claim 2, wherein the at least one convex portion comprises a film selected from the group consisting of a photosensitive organic resin film, an organic resin film, a silicon oxide film, a silicon nitride film and a silicon oxynitride film. ### Claim 5 (depends on 1) A liquid crystal display device according to claim 1, wherein a taper angle of the at least one convex portion is less than 90°. ### Claim 6 (depends on 2) A liquid crystal display device according to claim 2, wherein a taper angle of the at least one convex portion is less than 90°. ### Claim 7 (depends on 1) A liquid crystal display device according to claim 1, wherein each of the at least one gate wiring and the at least one source wiring comprises an element selected from the group consisting of Ta, W, Ti, Mo, Al, and Cu, and an alloy material having one of these elements as its main constituent, and a chemical compound material. ### Claim 8 (depends on 2) A liquid crystal display device according to claim 2, wherein each of the at least one gate wiring and the at least one source wiring comprises an element selected from the group consisting of Ta, W, Ti, Mo, Al, and Cu, and an alloy material having one of these elements as its main constituent, and a chemical compound material. ### Claim 9 (depends on 1) A liquid crystal display device according to claim 1, wherein the liquid crystal display device is a reflective type liquid crystal display device. ### Claim 10 (depends on 2) A liquid crystal display device according to claim 2, wherein the liquid crystal display device is a reflective type liquid crystal display device. ### Claim 11 (depends on 1) A liquid crystal display device according to claim 1, wherein the liquid crystal display device is a transmission type liquid crystal display device. ### Claim 12 (depends on 2) A liquid crystal display device according to claim 2, wherein the liquid crystal display device is a transmission type liquid crystal display device. ### Claim 13 (depends on 1) A liquid crystal display device according to claim 1, wherein the at least one convex portion extends in parallel with the at least one of the at least one gate wiring and the at least one source wiring. ### Claim 14 (depends on 2) A liquid crystal display device according to claim 2, wherein the at least one convex portion having a first height extends in parallel with the at least one gate wiring; and the at least one convex portion having a second height extends in parallel with the at least one source wiring.