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Browse Prior Art Database

Liquid Crystal Numerical Display

IP.com Disclosure Number: IPCOM000077483D
Original Publication Date: 1972-Aug-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Fan, GJ: AUTHOR

Abstract

The characteristic of the present numerical display is providing a numeral display in which every numeral is independent, although several numerals can be shared due to their related shapes. The display provided is a plurality of contiguous cells. A cell unit is illustrated in the figure. Each cell is comprised of glass container 1, having transparent electrodes 2 and 3 on two of its adjacent inner walls, a liquid-crystal material 4 sandwiched between the electrodes 2 and 3 and a transparent numeral 5 between one electrode and the wall of the cell. On applying a voltage between the electrodes 2 and 3, a change in the transmission of the liquid crystal occurs which results in an observable numeral.

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Liquid Crystal Numerical Display

The characteristic of the present numerical display is providing a numeral display in which every numeral is independent, although several numerals can be shared due to their related shapes. The display provided is a plurality of contiguous cells. A cell unit is illustrated in the figure. Each cell is comprised of glass container 1, having transparent electrodes 2 and 3 on two of its adjacent inner walls, a liquid-crystal material 4 sandwiched between the electrodes 2 and 3 and a transparent numeral 5 between one electrode and the wall of the cell. On applying a voltage between the electrodes 2 and 3, a change in the transmission of the liquid crystal occurs which results in an observable numeral.

In this display several numerals can be shared. If sharing is not used, 5 contiguous cells can be used to display the entire numeral set. If the following numeral sets are shared, i.e., (1, 4), (3, 8), (5, 6) and (9, 0) on one surface, only 3 cells are needed for the entire numeral set.

The display has the advantages of low cost of manufacture; it can be illuminated by an external source, including room light, hence it has no ambient light level or color limitation; it provides a set of natural looking numerals; and due to its low-power requirement, less than 20 mu w/cm/2/, the device can be used in portable systems.

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