公开(公告)号：EP1361475A4

公开(公告)日：2005-07-20

申请号：EP01273682

申请日：2001-12-25

Applicant: IBM

Inventor： TAKENAKA ATSUSHI ,  IKEZAKI MITSURU ,  KUSAFUKA KAORU

IPC: G09G3/36

CPC classification number: G09G3/3648 ,  G09G3/3614 ,  G09G2300/0434 ,  G09G2320/0204 ,  G09G2320/0219 ,  G09G2320/0247 ,  G09G2330/026

Abstract: A liquid crystal display device requiring no flicker adjustment after manufactured. The liquid crystal display device is of IPS drive type. Just after the liquid crystal display device is turned on, there is an intial voltage component between a pixel electrode and a common electrode. The initial DC voltage component is considered to cause flicker. When the DC voltage component is automatically lowered to an allowable value in a predetermined time after the power is turned on, flicker adjustment is not required by changing the potential applied to the electrodes in the pixels. For this, it is necessary to lower the initial DC compositions sufficiently and to make a construction in which charge can migrate at a high speed in the liquid crystal panel. A punching-through compensation drive method is adopted as one technique of lowering the initial DC components. The construction of opposed substrates are made preferrable to facilitate the migration of charge therein.

公开(公告)号：CA2436451A1

公开(公告)日：2002-08-15

申请号：CA2436451

申请日：2001-12-25

Applicant: IBM

Inventor： IKEZAKI MITSURU ,  KUSAFUKA KAORU ,  TAKENAKA ATSUSHI

IPC: G09G3/36 ,  G02F1/133 ,  G02F1/1368 ,  G09G3/20

Abstract: A liquid crystal display device requiring no flicker adjustment after manufactured. The liquid crystal display device is of IPS drive type. Just after the liquid crystal display device is turned on, there is an intial voltage component between a pixel electrode and a common electrode. The initial DC voltage component is considered to cause flicker. When the DC voltage component is automatically lowered to an allowable value in a predetermined time after the power is turned on, flicker adjustment is not required by changing the potential applied to the electrodes in the pixels. For this, it is necessary to lower the initial DC compositions sufficiently and to make a construction in which charge can migrate at a high speed in th e liquid crystal panel. A punching-through compensation drive method is adopte d as one technique of lowering the initial DC components. The construction of opposed substrates are made preferrable to facilitate the migration of charg e therein.

公开(公告)号：JP2002098982A

公开(公告)日：2002-04-05

申请号：JP2000270143

申请日：2000-09-06

Applicant: IBM

Inventor： SHIMIZU EIJU ,  KUSAFUKA KAORU ,  IKEZAKI MITSURU ,  TERUKINA ASAO

IPC: G02F1/1343 ,  G02F1/136 ,  G02F1/1368

Abstract: PROBLEM TO BE SOLVED: To provide a display panel and a display device, capable of enhancing opening ratio of a pixel area. SOLUTION: In each pixel area of a liquid crystal panel 100 of a transverse electric field system, a pixel electrode 18 is made into a two-layer structure consisting of a lower part pixel electrode 21, which is positioned on the same layer as that of a signal line 15 and a upper part pixel electrode 22, which is positioned on the same layer as that of a common electrode 17, and the electrode part of the lower part pixel electrode 21 is set closer to the signal line 15 than to the upper part pixel electrode 22. Moreover, the signal line 15, a gate line 16 and the common electrode 17 are arranged overlapped.

公开(公告)号：JP2001242828A

公开(公告)日：2001-09-07

申请号：JP2000050048

申请日：2000-02-25

Applicant: IBM

Inventor： YAMASHITA HIROSHI ,  YAMAUCHI KAZUSHI ,  KUSAFUKA KAORU

IPC: G02F1/1335 ,  G02F1/133 ,  G09G3/20 ,  G09G3/36 ,  G09G5/02 ,  H04N5/66 ,  H04N9/30

Abstract: PROBLEM TO BE SOLVED: To increase the number of gradation levels which can be displayed in a liquid crystal display device, particularly the number of gradation levels which can be displayed in a monochromatic liquid crystal display device by leaps and bounds. SOLUTION: The image display device for multigradation expression has subpixels 52, 53 which transmit achromatic light with a first transmittance and a subpixel 51 which transmits achromatic light with a second transmittance different from the first transmittance of the subpixels 52, 53 and the gradation levels possessed by the inputted video data are expressed by the combination of the gradation expression made by the first transmittance in the subpixels 52, 53 an the gradation expression made by the second transmittance in the subpixel 51.

公开(公告)号：JP2000321587A

公开(公告)日：2000-11-24

申请号：JP13021999

申请日：1999-05-11

Applicant: IBM

Inventor： SHIMIZU EIJU ,  KUSAFUKA KAORU

IPC: G02F1/1343

Abstract: PROBLEM TO BE SOLVED: To obtain a liquid crystal display device of a new structure having a wide viewing angle as well as high contrast over the whole viewing angle and to obtain the method for its production. SOLUTION: This device is equipped with a pair of first substrate 3 and a second substrate 4, a liquid crystal layer 5 held between the first substrate 3 and the second substrate 4, and switching electrodes comprising a first comblike electrode 1 and a second comblike electrode 2. Preferably, in the space between the protrusion 1-1 of the comblike electrode 1 and the protrusion 2-1 of the second comb-like electrode 2 which constitute the electrodes facing each other of the aforementioned switching electrodes, a first domain 6 and a second domain 7 symmetrically polarized, preferably in relation to the center X of the electrodes facing each other are formed.

公开(公告)号：JPH09179097A

公开(公告)日：1997-07-11

申请号：JP32918795

申请日：1995-12-18

Applicant: IBM

Inventor： KUSAFUKA KAORU ,  SHIMIZU EIJU ,  KIMURA SHINICHI

IPC: G02F1/133 ,  G09G3/36

Abstract: PROBLEM TO BE SOLVED: To provide a driving method for a low power consumption liquid crystal display device excellent in picture quality and reliability by outputting two-split correction voltages even in case a gate line load increases as a result of a large-sized and high precision display screen. SOLUTION: A potential of a gate line Gn+1 is raised up to Vc1a, and at the same time, a potential of the previous stage gate line Gn is raised from Vc1a to Vc1b. And, for example, by making the potential of the gate line Gn+1 to Vc1b after 1H, a final effective value correction is performed to a picture element connected with the gate line Gn+1. In this way, a punch-through correction potential Vc1a and the effective correction potential Vc1b are separated into two steps to be applied to an auxiliary capacitor Cs. And since the effective value correction is performed after the punch-through voltage correction at the first step, the effective value correction does not decrease as it approaches to the gate end part.

公开(公告)号：JP2001330841A

公开(公告)日：2001-11-30

申请号：JP2000075565

申请日：2000-03-17

Applicant: IBM

Inventor： KODATE MANABU ,  KIMURA SHINICHI ,  KUSAFUKA KAORU ,  SHIMIZU EIJU

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

Abstract: PROBLEM TO BE SOLVED: To obtain a liquid crystal display device with little image display failure or deterioration. SOLUTION: The device has a common wire 502, gate wire 503, source wire 204 and alignment film in the outer peripheral region of a liquid crystal cell. The alignment film is insulated by an insulating film from the gate wire 503 and the source wire 204. The common wire 502 has a common potential exposed part 401 through an opening formed in the insulating film and electrically connected with the alignment film. Since the common voltage which is near the average voltage of the cell is supplied on the alignment film, display failure in the screen or deterioration caused by impurity ions remaining on the surface of the alignment film or in the alignment film can be prevented.

公开(公告)号：JP2000019558A

公开(公告)日：2000-01-21

申请号：JP17607698

申请日：1998-06-23

Applicant: IBM

Inventor： SHIMIZU EIJU ,  KUSAFUKA KAORU ,  KIMURA SHINICHI

IPC: G02F1/1343 ,  G02F1/136 ,  G02F1/1362 ,  G02F1/1368

Abstract: PROBLEM TO BE SOLVED: To prevent the generation of after-images by suppressing reverse twisting and to make a response speed better and an aperture ratio higher with a TFT drive liquid crystal display device having an IPS structure. SOLUTION: The electrodes on the upper side and the electrodes on the lower side of the auxiliary capacitors of the electrode structure of the IPS mode, in which the switching electrodes of the one pole and the switching electrodes of the other pole are arranged in parallel and the auxiliary capacitors are arranged non-parallel with the switching elements, are formed to different shapes. More particularly the auxiliary capacitors in proximity to the regions where reverse the twisting occurs is desirably formed to the shapes obtd. by cutting off the portions of the upper electrode in contact with the light transparent regions 110, 112.