公开(公告)号：US20140247416A1

公开(公告)日：2014-09-04

申请号：US14278795

申请日：2014-05-15

Applicant: Japan Display Inc.

Inventor： Yosuke Hyodo ,  Koichi Igeta ,  Toshiki Kaneko ,  Noboru Kunimatsu ,  Hidehiro Sonoda

IPC: G02F1/1339

CPC classification number: G02F1/13394 ,  G02F1/133371 ,  G02F1/13378 ,  G02F1/1339 ,  G02F1/1341 ,  G02F1/1368 ,  G02F2001/13398 ,  G02F2001/13415 ,  G02F2201/50

Abstract: A display device includes a first substrate having organic and alignment films, a second substrate adhered to the first substrate by a sealant which surrounds a pixel region, a columnar spacer formed on the second substrate defining a distance between the first substrate and the second substrate, and a recessed portion formed in the organic film of the pixel region, the recessed portion facing to the columnar spacer. The recessed portion has a convex portion at a bottom of the recessed portion, and a height of a top of the convex portion from the first substrate is lower than a height of an upper surface of the organic film from the first substrate. A thickness of an alignment film on the convex portion is smaller than a thickness of the bottom of the recessed portion, and a top of the columnar spacer is in contact with the convex portion.

Abstract translation: 显示装置包括具有有机和取向膜的第一基板，通过围绕像素区域的密封剂粘附到第一基板的第二基板，形成在第二基板上的形成在第一基板和第二基板之间的距离的柱状间隔件， 以及形成在像素区域的有机膜中的凹部，凹部与柱状间隔物相对。 凹部在凹部的底部具有凸部，凸部的与第一基板的顶部的高度比第一基板的有机薄膜的上表面的高度低。 凸部上的取向膜的厚度小于凹部的底部的厚度，柱状间隔件的顶部与凸部接触。

公开(公告)号：US11914254B2

公开(公告)日：2024-02-27

申请号：US18127035

申请日：2023-03-28

Applicant: Japan Display Inc.

Inventor： Yasushi Tomioka ,  Toshimasa Ishigaki ,  Hidehiro Sonoda ,  Sumito Ueta

IPC: G02F1/1362 ,  G02F1/1333 ,  G02F1/1335 ,  G02F1/1337 ,  G02F1/1368

CPC classification number: G02F1/136227 ,  G02F1/133345 ,  G02F1/133512 ,  G02F1/1337 ,  G02F1/133707 ,  G02F1/1368 ,  G02F1/133357 ,  G02F2201/121 ,  G02F2201/123

Abstract: 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.

公开(公告)号：US11852923B2

公开(公告)日：2023-12-26

申请号：US17685441

申请日：2022-03-03

Applicant: Japan Display Inc.

Inventor： Takenori Hirota ,  Yasuhiro Kanaya ,  Hidehiro Sonoda ,  Toshiki Kaneko

IPC: G02F1/1339 ,  G02F1/1333

CPC classification number: G02F1/1339 ,  G02F1/133345 ,  G02F1/133388

Abstract: A reliability of seal portion of a liquid crystal display device can be improved by the following structure. A liquid crystal display device includes: a TFT substrate which includes a display region and a terminal part, and has an inorganic insulating film formed on an organic passivation film and an alignment film formed over the inorganic insulating film; a counter substrate, the TFT substrate and the counter substrate bonded together by a sealing material formed at a seal part surrounding the display region; and a liquid crystal sealed inside. At the seal part, a transparent conductive oxide film is formed between the inorganic insulating film and the alignment film. The transparent conductive oxide film exists inside an edge of the TFT substrate and hence, the edge of the TFT substrate is free of the transparent conductive oxide film.

公开(公告)号：US20230236463A1

公开(公告)日：2023-07-27

申请号：US18127035

申请日：2023-03-28

Applicant: Japan Display Inc.

Inventor： Yasushi TOMIOKA ,  Toshimasa Ishigaki ,  Hidehiro Sonoda ,  Sumito Ueta

IPC: G02F1/1362 ,  G02F1/1337 ,  G02F1/1333 ,  G02F1/1335 ,  G02F1/1368

CPC classification number: G02F1/136227 ,  G02F1/1337 ,  G02F1/1368 ,  G02F1/133345 ,  G02F1/133512 ,  G02F1/133707 ,  G02F1/133357 ,  G02F2201/121 ,  G02F2201/123

Abstract: 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.

公开(公告)号：US11474403B2

公开(公告)日：2022-10-18

申请号：US17499952

申请日：2021-10-13

Applicant: Japan Display Inc.

Inventor： Yasushi Tomioka ,  Toshimasa Ishigaki ,  Hidehiro Sonoda ,  Sumito Ueta

IPC: G02F1/13 ,  G02F1/1362 ,  G02F1/1337 ,  G02F1/1333 ,  G02F1/1335 ,  G02F1/1368

Abstract: 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.

公开(公告)号：US11300835B2

公开(公告)日：2022-04-12

申请号：US16937962

申请日：2020-07-24

Applicant: Japan Display Inc.

Inventor： Takenori Hirota ,  Yasuhiro Kanaya ,  Hidehiro Sonoda ,  Toshiki Kaneko

IPC: G02F1/1339 ,  G02F1/1333

Abstract: A reliability of seal portion of a liquid crystal display device can be improved by the following structure. A liquid crystal display device includes: a TFT substrate which includes a display region and a terminal part, and has an inorganic insulating film formed on an organic passivation film and an alignment film formed over the inorganic insulating film; a counter substrate, the TFT substrate and the counter substrate bonded together by a sealing material formed at a seal part surrounding the display region; and a liquid crystal sealed inside. At the seal part, a transparent conductive oxide film is formed between the inorganic insulating film and the alignment film. The transparent conductive oxide film exists inside an edge of the TFT substrate and hence, the edge of the TFT substrate is free of the transparent conductive oxide film.

公开(公告)号：US11275274B2

公开(公告)日：2022-03-15

申请号：US17077412

申请日：2020-10-22

Applicant: Japan Display Inc.

Inventor： Noboru Kunimatsu ,  Masaki Matsumori ,  Hidehiro Sonoda ,  Yasushi Tomioka ,  Toshiki Kaneko

IPC: G02F1/1337 ,  G02F1/1339 ,  G02F1/1333 ,  G02F1/1362 ,  G02F1/1368 ,  G02F1/1343

Abstract: The present invention prevents the shaving of an alignment film caused by a columnar spacer in a liquid crystal display device of an IPS method using photo-alignment. A plinth higher than a pixel electrode is formed at a part where a columnar spacer formed over a counter substrate touches a TFT substrate. When an alignment film of a double-layered structure is applied over the pixel electrode and the plinth, the thickness of the alignment film over the plinth reduces by a leveling effect. When photo-alignment is applied in the state, a photodegraded upper alignment film over the plinth disappears and a lower alignment film having a high mechanical strength remains. As a result, it is possible to prevent the shaving of the alignment film.

公开(公告)号：US11156875B2

公开(公告)日：2021-10-26

申请号：US16704538

申请日：2019-12-05

Applicant: Japan Display Inc. ,  Panasonic Liquid Crystal Display Co., Ltd.

Inventor： Noboru Kunimatsu ,  Chikae Matsui ,  Hidehiro Sonoda ,  Yuko Matsumoto ,  Shoichi Uchino ,  Masaki Matsumori ,  Yasushi Tomioka

IPC: G02F1/1337 ,  G02F1/1343 ,  G02F1/1368 ,  H01L27/12 ,  C09K19/56

Abstract: A liquid crystal display device includes a TFT substrate having a first alignment film and an opposing substrate having a second alignment film with liquid crystals sandwiched therebetween. One of the first and second alignment films, comprises a first polyimide produced via polyamide acid ester containing cyclobutane as a precursor and a second polyimide produced via polyamide acid as a precursor. The polyamide acid has a higher polarity than that of the polyamide acid ester. The one of the first and second alignment films is responsive to photo-alignment. A first side of the one of the first and second alignment films is adjacent to the liquid crystals, and a second side thereof is closer to one of the TFT substrate and the counter substrate than the first side. The first side contains more of the first polyimide and less of the second polyimide than the second side.

公开(公告)号：US11150523B2

公开(公告)日：2021-10-19

申请号：US16953997

申请日：2020-11-20

Applicant: Japan Display Inc.

Inventor： Yasushi Tomioka ,  Yosuke Hyodo ,  Hidehiro Sonoda ,  Noboru Kunimatsu

IPC: G02F1/136 ,  G02F1/1343 ,  G02F1/1362 ,  G02F1/1333 ,  G02F1/1335 ,  G02F1/1368 ,  H01L27/12 ,  G02F1/1337

Abstract: In a liquid crystal display device, a common electrode is formed on an organic passivation film, an interlayer insulating film is formed on the common electrode, a pixel electrode with a slit is formed on the interlayer insulating film, and a through hole is formed in the organic passivation film and the interlayer insulating film, so that the pixel electrode is connected to a source electrode of a TFT through the through hole. Further, the taper angle around the upper base of the through hole is smaller than the taper angle around the lower base. Thus, the alignment film material can easily flow into the through hole when the diameter of the through hole is reduced to connect the pixel and source electrodes, preventing display defects such as uneven brightness due to the absence of the alignment film or due to the alignment film irregularity around the through hole.

公开(公告)号：US20210155755A1

公开(公告)日：2021-05-27

申请号：US17164973

申请日：2021-02-02

Applicant: Japan Display Inc.

Inventor： Hidehiro Sonoda ,  Takenori Hirota ,  Yasushi Tomioka ,  Noboru Kunimatsu

IPC: C08G73/10 ,  G02F1/1337 ,  C09D179/08

Abstract: According to one embodiment, a varnish for a photo alignment film includes an imidization promotor and a first polyamic acid-based compound in an organic solvent. The first polyamic acid-based compound is a polyamic acid or a polyamic acid ester. The imidization promotor has skeleton containing no primary amino group and no secondary amino group. The first polyamic acid-based compound has terminal skeletons containing no primary amino group.