# US 9,519,196 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 9,519,196 B2 - Document ID: US9519196B2 - Status: Granted - Kind: B2 - Application number: 14/564,129 - Filed: 2014-12-09 - Published: 2015-06-11 - Granted: 2016-12-13 - Earliest claimed: 2013-12-09 - Assignees: Japan Display Inc. - Applicants: Japan Display Inc. - Inventors: Yasushi Tomioka; Toshimasa Ishigaki; Hidehiro Sonoda; Sumito Ueta - Web page: https://patentgrep.com/patent/US9519196B2 ## CPC - G02F 1/136227: {Through-hole connection of the pixel electrode to the active element through an insulation layer} - G02F 1/133345: {Insulating layers (G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence)} - G02F 1/133512: {Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence)} - G02F 1/1337: Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers - G02F 1/133707: {Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes} - G02F 1/1368: in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)} - G02F 1/133357: {Planarisation layers} - G02F 2201/121: common or background - G02F 2201/123: pixel - 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 To prevent a phenomenon that an alignment film material is difficult to flow into the through-hole where a diameter of a through-hole for connecting between a pixel electrode and a source electrode is reduced. A liquid crystal display device comprising a TFT substrate having pixels each including a common electrode formed on an organic passivation film, an interlayer insulating film formed so as to cover the common electrode, a pixel electrode having a slit and formed on the interlayer insulating film, a through-hole formed in the organic passivation film and the interlayer insulating film, and a source electrode electrically conducted to the pixel electrode via the through-hole. A taper angle at a depth of D/2 of the through-hole is equal to or more than 50 degrees. The pixel electrode covers part of a side wall of the through-hole but does not cover the remaining part of the side wall of the through-hole. This configuration facilitates the alignment film material to flow into the through-hole, thereby solving a thickness unevenness of the alignment film in vicinity of the through-hole. ## Claims ### Claim 1 A liquid crystal display device comprising: a TFT substrate having pixels each including a common electrode formed on an organic passivation film, an interlayer insulating film formed so as to cover the common electrode, a pixel electrode formed on the interlayer insulating film, the pixel electrode having a slit, a through-hole formed in the organic passivation film and the interlayer insulating film, and a source electrode electrically conducted to the pixel electrode via the through-hole; a counter substrate having a black matrix formed thereon; and liquid crystal sandwiched between the TFT substrate and the counter substrate, wherein, where the through-hole formed in the organic passivation film assumes a cross-section in which a top face is defined on the side of the counter substrate and a bottom face is defined on the side of the source electrode, the top face having a diameter larger than that of the bottom face, the through-hole having a depth of D, a taper angle at a depth of D/2 of the through-hole is equal to or more than 50 degrees, and wherein the pixel electrode covers part of a side wall of the through-hole but does not cover the remaining part of the side wall of the through-hole. ### Claim 2 (depends on 1) A liquid crystal display device according to claim 1, wherein the taper angle of the through-hole is equal to or more than 60 degrees. ### Claim 3 A liquid crystal display device comprising: a TFT substrate having pixels each including a pixel electrode formed on an organic passivation film, a through-hole formed in the organic passivation film, a source electrode electrically conducted to the pixel electrode via the through-hole, an interlayer insulating film formed so as to cover the pixel electrode, and a common electrode formed on the interlayer insulating film, the common electrode having a slit; a counter substrate having a black matrix formed thereon; and liquid crystal sandwiched between the TFT substrate and the counter substrate, wherein, where the through-hole formed in the organic passivation film assumes a cross-section in which a top face is defined on the side of the counter substrate and a bottom face is defined on the side of the source electrode, the top face having a diameter larger than that of the bottom face, the through-hole having a depth of D, a taper angle at a depth of D/2 of the through-hole is equal to or more than 50 degrees, and wherein the common electrode covers part of a side wall of the through-hole but does not cover the remaining part of the side wall of the through-hole. ### Claim 4 (depends on 3) A liquid crystal display device according to claim 3, wherein the taper angle of the through-hole is equal to or more than 60 degrees. ### Claim 5 A liquid crystal display device comprising: a TFT substrate having pixels each including a common electrode formed on an organic passivation film, an interlayer insulating film formed so as to cover the common electrode, a pixel electrode formed on the interlayer insulating film, the pixel electrode having a slit, a through-hole formed in the organic passivation film and the interlayer insulating film, and a source electrode electrically conducted to the pixel electrode via the through-hole; a counter substrate having a black matrix formed thereon; and liquid crystal sandwiched between the TFT substrate and the counter substrate, wherein, where the through-hole formed in the organic passivation film assumes a cross-section in which a top face is defined on the side of the counter substrate and a bottom face is defined on the side of the source electrode, the top face having a diameter larger than that of the bottom face, the through-hole having a depth of D, a taper angle at a depth of D/2 of the through-hole is equal to or more than 50 degrees, and the slit of the pixel electrode extends to a depth of 1 μm or more from a top surface of the organic passivation film or to a depth of D/4 or more from the top surface of the organic passivation film. ### Claim 6 (depends on 5) A liquid crystal display device according to claim 5, wherein the slit extends to the bottom face of the through-hole. ### Claim 7 (depends on 6) A liquid crystal display device according to claim 6, wherein the taper angle of the through-hole is equal to or more than 60 degrees. ### Claim 8 (depends on 5) A liquid crystal display device according to claim 5, wherein the taper angle of the through-hole is equal to or more than 60 degrees. ### Claim 9 A liquid crystal display device comprising: a TFT substrate having pixels each including a pixel electrode formed on an organic passivation film, a through-hole formed in the organic passivation film, a source electrode electrically conducted to the pixel electrode via the through-hole, an interlayer insulating film formed so as to cover the pixel electrode, and a common electrode formed on the interlayer insulating film, the common electrode having a slit; a counter substrate having a black matrix formed thereon; and liquid crystal sandwiched between the TFT substrate and the counter substrate, wherein, where the through-hole formed in the organic passivation film assumes a cross-section in which a top face is defined on the side of the counter substrate and a bottom face is defined on the side of the source electrode, the top face having a diameter larger than that of the bottom face, the through-hole having a depth of D, a taper angle at a depth of D/2 of the through-hole is equal to or more than 50 degrees, and the slit of the pixel electrode extends to a depth of 1 μm or more from a top surface of the organic passivation film or to a depth of D/4 or more from the top surface of the organic passivation film. ### Claim 10 (depends on 9) A liquid crystal display device according to claim 9, wherein the slit extends to the bottom face of the through-hole. ### Claim 11 (depends on 10) A liquid crystal display device according to claim 10, wherein the taper angle of the through-hole is equal to or more than 60 degrees. ### Claim 12 (depends on 9) A liquid crystal display device according to claim 9, wherein the taper angle of the through-hole is equal to or more than 60 degrees.