Browse Prior Art Database

Storage CRT Display Terminals: Evolution and Trends Disclosure Number: IPCOM000131259D
Original Publication Date: 1978-Nov-01
Included in the Prior Art Database: 2005-Nov-10
Document File: 10 page(s) / 36K

Publishing Venue

Software Patent Institute

Related People

Richard B. Preiss: AUTHOR [+3]


Tektronix, Inc.

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This record contains textual material that is copyright ©; 1978 by the Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Contact the IEEE Computer Society (714-821-8380) for copies of the complete work that was the source of this textual material and for all use beyond that as a record from the SPI Database.

Storage CRT Display Terminals: Evolution and Trends

Richard B. Preiss

Tektronix, Inc.

Storage-tube display technology and costs will continue to attract new users and new applications, especially where verily high information density is needed.

The direct view storage tube was invented by Robert H. Anderson in the late 1950's' and first introduced in the model 564 oscilloscope. As computer display requirements matured, it was felt that a larger-screen version of the DVST might fulfill a need in the computing industry, and thus the 611 11-inch storage monitor was introduced in 1967.2 By 1970, Computek, Adage, and Tektronix all had graphics terminals on the market based on the 611 monitor. Even though these terminals represented a cost breakthrough at the time ($9000 as opposed to an IBM 2250 at $80,000), success was not assured and knowledgeable people were predicting a fiveyear life for the DVST technology. Then, in 1972, Tektronix introduced the 4010 DVST graphics terminal at $4000. This terminal launched the storage graphics revolution. Was cost the only important factor? Perhaps not, for in 1973 the 4014 19-inch storage terminal was introduced at $8995, and it became an even bigger success than the 4010, resulting in a new class of customers using storage graphics terminals. Knowledgeable people continued to predict a five-year life for the DVST technology and were now carefully watching the declining cost of RAM memory. Now, five years later, RAM costs are still being watched, and the 611 storage monitor is still selling. Complex interactions are evidently operating in the storage-terminal marketplace.

The direct view storage tube

The DVST was not the first storage CRT developed. Mesh storage was pioneered by Hughes with the "Memoscope" in the mid-1950's. While

mesh storage has high writing rates and excellent brightness, it is also plagued by drawbacks such as blooming, poor spot size, and too much sensitivity to be useful in computer display applications. Many of these drawbacks were remembered and associated with DVSTs when they were first introduced. This, coupled with a poor understanding of some of the unique aspects of the DVST, resulted in poor early sales of DVST display devices in the computer marketplace.

The direct view storage tube contains a writing gun, a flood-gun system, and a phosphor collector target. Figure 1 shows this general structure. The writing gun and the flood gun both influence the secondary electron yields from the target. Figure 2 shows the relationship. Flood electrons continu...