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Electrode Configurations to Reduce the Power Consumption and Enhance the Contrast of the Matrix-Addressed Smectic a Liquid Crystal Display

IP.com Disclosure Number: IPCOM000044499D
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 3 page(s) / 33K

Publishing Venue

IBM

Related People

Liu, K: AUTHOR [+2]

Abstract

The abbreviation MASD will stand for the thermal-activated, electric field selected, matrix-addressed smectic A liquid crystal displays. The detailed structure and properties of MASD can be found in [1,2,3]. The recent publication [3] revealed that MASD is attractive for direct-view flat panel display except that it requires about 25 watts to write a display panel of about 1,000 characters in two seconds. As a comparison, a typical refreshed, matrix-addressed EL panel of comparable size consumes about 1 watt. (Electric power inputs into the panel. By the way, the power consumption will be about 15 watts including drivers.) A comparable vacuum fluorescent panel will consume about 6 watts. The electrode configuration of MASD is a simple structure.

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Electrode Configurations to Reduce the Power Consumption and Enhance the Contrast of the Matrix-Addressed Smectic a Liquid Crystal Display

The abbreviation MASD will stand for the thermal-activated, electric field selected, matrix-addressed smectic A liquid crystal displays. The detailed structure and properties of MASD can be found in [1,2,3]. The recent publication
[3] revealed that MASD is attractive for direct-view flat panel display except that it requires about 25 watts to write a display panel of about 1,000 characters in two seconds. As a comparison, a typical refreshed, matrix-addressed EL panel of comparable size consumes about 1 watt. (Electric power inputs into the panel. By the way, the power consumption will be about 15 watts including drivers.) A comparable vacuum fluorescent panel will consume about 6 watts. The electrode configuration of MASD is a simple structure. The smectic liquid crystal (LC) medium is sandwiched in between two conductive-film-coated glass substrates.

The conductive films are in direct contact with the LC medium. Both conductive films are sectionalized into separated parallel strips. The parallel conducting strips on one of the substrates are orientated perpendicular to those strips on the other substrate to form the so-called row and column electrodes, respectively. This article will describe a new electrode configuration for MASD to reduce the power consumption from 25 watts to about 5 watts. The new electrode configuration will also enhance the contrast ratio of MASD.

The name of the display panel associated with this new invention will be called MMASD, where no change on the column electrode of the MASD, but the resistive row electrode of MASD is replaced by the form of a metal mesh deposited on a polymer substrate or a polymer film on a glass substrate. It has been shown by Yang [4] and Armitage [5] that a polymer substrate will reduce the power consumption a factor of two as compared to a glass substrate. Fig. 1a shows a typical strip of the resistive row electrode of MASD. The width S ranges from 100 to 400 mm. A typical strip of meshed row electrodes of MMASD is shown in Fig. 1b, where 1 and w are about 5 and 25 mm or 2 and 10 mm, respectively. The electrode area of Fig. 1b is only about .36 compared to that corresponding to Fig. 1a. Therefore, the power consumption should be reduced by a factor of about 2.5. In addition, in MASD, the whole solid strip S is heated up so that the LC medium adjacent to it is also heated up to the isotropic state nearly uniformly. During coding, the contours of equal thermal grading, more...