Browse Prior Art Database

A Method of Capacitance Stabilization of Active Matrix Liquid Crystal Display Pixels

IP.com Disclosure Number: IPCOM000123190D
Original Publication Date: 1998-Jun-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Takasugi, S: AUTHOR [+3]

Abstract

Disclosed is a design method to stabilize a capacitance ratio of an active matrix liquid crystal display pixel.

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This is the abbreviated version, containing approximately 100% of the total text.

A Method of Capacitance Stabilization of Active Matrix Liquid Crystal
Display Pixels

   Disclosed is a design method to stabilize a capacitance
ratio of an active matrix liquid crystal display pixel.

   Figure 1 shows a typical pixel.  A pixel has two main
capacitances, Cs and Cgs, which affect its voltage-transparency
relationship.  Fluctuation of the Cs-Cgs ratio can be seen as color
fluctuation of a displayed image.  To avoid the fluctuation of the
capacitance ratio is important to improve the display quality.

   Figure 2 shows a pixel designed with the new method.  A
layer forms both of the Cs and the Cgs, which have similar shapes.
Etching and positioning fluctuations of the pixel electrode layer
have no effect on them because the Cs edge is formed by the signal
line layer.  Etching and positioning fluctuations of the signal line
layer still affect them, but their ratio will not fluctuate so much,
because of their shape similarity.