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Browse Prior Art Database

Pixel Design for Two Domain Twisted Nematic Liquid Crystal Display

IP.com Disclosure Number: IPCOM000116824D
Original Publication Date: 1995-Nov-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 89K

Publishing Venue

IBM

Related People

Momoi, Y: AUTHOR [+4]

Abstract

Disclosed is a design of the shape of storage capacitance lines or any other light-shield layer in pixels of the two-domain twisted nematic (TDTN) thin-film-transistor (TFT) driven Liquid Crystal Display (LCD) to shut the leaking light from the desclination lines of the domain boundaries.

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Pixel Design for Two Domain Twisted Nematic Liquid Crystal Display

      Disclosed is a design of the shape of storage capacitance lines
or any other light-shield layer in pixels of the two-domain twisted
nematic (TDTN) thin-film-transistor (TFT) driven Liquid Crystal
Display (LCD) to shut the leaking light from the desclination lines
of the domain boundaries.

      Figs. 1 through 3 show the pixels of the TFT-LCD.  (1) is the
aperture area.  (2) is the TFT.  (3) is the storage capacitance or
any other light-shield layer.  (4) is the desclination line.  The
leaking light from the desclination line, which is the bright line
found in the center of each pixel (Fig. 1 (4)), causes contrast ratio
reduction.  To maintain high contrast ratio, it is needed to cover
the desclination lines completely.  To cover the disclination lines
completely by the conventional rectangular shape of the storage
capacitance lines, the width of the storage capacitance lines become
wide and the aperture ratio of the pixel becomes decreased (Fig. 2).
The proposed shape of the storage capacitance lines or some
light-shield layer in this article, is the one along to the
descrination line (Fig. 3).  It provides both perfect light shield
and large aperture ratio.