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Browse Prior Art Database

Interactive Capability for EL Faceplate Storage CRT

IP.com Disclosure Number: IPCOM000089413D
Original Publication Date: 1977-Oct-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Chang, IF: AUTHOR

Abstract

It is known that a memory EL (electroluminescent) panel may be incorporated in a CRT to allow electron-beam addressing and to achieve storage display. But in storage CRTs, light pen interaction (a very desirable feature in graphics, text editing, etc.) is generally not easily obtainable. Described here are methods for achieving such interactive capability.

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Interactive Capability for EL Faceplate Storage CRT

It is known that a memory EL (electroluminescent) panel may be incorporated in a CRT to allow electron-beam addressing and to achieve storage display. But in storage CRTs, light pen interaction (a very desirable feature in graphics, text editing, etc.) is generally not easily obtainable. Described here are methods for achieving such interactive capability.

To facilitate light pen interaction, the EL faceplate may be constructed as follows: As shown in the figure, a glass substrate 1 is coated with transparent conductor 2, and deposited thereon are an optional insulating layer 3 and an EL layer 4 with memory property. A CL (cathodoluminescent) layer 5, with proper wavelength emission for switching the EL memory effect, is deposited on 4. A thin layer of conducting electrode 6 is then deposited on 5. It should be noted that layer 5 and layer 6 may be interchanged in sequence, and an additional insulating film may be added on layer 4 for breakdown protection. In addition, another CL layer 7, having a different emission spectrum from layer 5 but suitable for light pen detection, is deposited on layer 6 or 5. In operation, the electron-beam voltage is switched to high potential to allow penetration into layer 5 for triggering storage display and to lower potential to allow beam penetration only into layer 7 so that a different wavelength CL is available for light pen detection.

Alternatively, a light pen with frequen...