Displags news

Low complexity terminal Standard colour TVs are not capable of producing the high definition displays required for computer alpha- numerics and graphics. And specially designed high resolution monitors are often prohibitively expensive. To bridge this gap, Microvitec has intro- duced a low complexity colour display terminal.

The unit's 355 mm screen offers UP to 80 column capability in a metal cabin- et. It joins the Microvitec terminal range of a 355 mm f•am-cased unit and a 500 mm metal-cased terminal. The display has been adopted by a number of microcomputer companies and offers compatibil ity with others.

Microvitec Ltd, Boiling Road, Bradford, West Yorks, UK

Metal-cased low complexity microcomputer display

Pen and paper move Simultaneous movement of pen and paper on a Hewlett-Packard plotter for personal computers offers perfor- mance advantages over competing low-cost plotters, says the company. Two-colour capability and high resolution plotting at speeds up to 380 mms -1 give graphics suited to application in architecture, engineer- ing, banking and real estate.

215 x 280 mm plots are produced by the System's micro-grip drive. Reso-

lution (step size) is 25/~m and repeat- ability 100/zm. The low inertia of the pen-and-paper movement avoids the problems of conventional plotters - bulkiness, high power consumption and high cost. A variable relative velo- city between pen and paper suits special drawing conditions.

Hewlett-Packard Ltd, Nine Mile Ride, Easthampstead, Wokingham, Berks RG11 3LL, UK

Contrast is optimized using phosphor-matched filters

Phosphor-matched f i l ters Colour matching to specific phosphors maximizes the improvement in contrast and readability on a range of VDU screen filters from SGL International. The Homalite filters have a low reflec- tance surface cast into the fi l ter to pre- vent chipping and peeling. A range of colours and sizes is available to suit most CRT phosphors and mounting arrangements.

SGL International, 76 Euclid Avenue, Haddonfield, NJ 08803, USA

Automatic CRT measurement Spatial and photometric measurements can be made anywhere on the face of a CRT under computer control using a device from Centronic. No mechanical scanning is needed. Only the CRT's electron beam is moved to measure spot and luminance properties.

Centronic Sales Ltd, Centronic House, King Henry's Drive, New Addington, Croydon, Surrey CR9 0BG, UK

Flying spot driver LEDs of various colours incorporated in one display can be driven using a device from AEG Telefunken. The driver, intended for 30-element flying spot LED displays, requires nine address lines. A variable reference voltage range can display voltage ratios.

The drivers can be chained to drive multiples of 30 LEDs with direct con- nection of the integrated voltage dividers. This means that the reference voltage range only has to be adjusted once.

Hero Electronics L td, Dunstable Street, Ampthill, Beds MK45 2JS, UK

Squarer and flatter A flatter and more rectangular screen than on their other 305 mm 90 ° tubes is a feature of a new tube from Philips. The data graphic display tube is inten- ded for personal computers, stand- alone terminals and word processors. Resolution is approximately 1 300 lines offering a 2 000 character display. A choice of four phosphors and three anti-reflective treatments is available.

N V Philips" Gloeilampenfabrieken, Elcoma Division, PO Box 523, 5600 AM Eindhoven, The Netherlands

High voltage driver

Digits or segments can be driven using a driver integrated circuit from Rastra Electronics. The monolithic multiple driver is high-voltage, designed to inter- face between low-level digital logic and vacuum fluorescent displays. Eight independent stages with a common bias supply are included driving digits or segments of these displays. Voltage level shifting and pull-down compon- ents are incorporated into the one chip.

Rastra Electronics Ltd, 275-281 King Street, London W6 9NF, UK

DISPLAYS. JULY 1982 169