Browse Prior Art Database

Multicolor Display

IP.com Disclosure Number: IPCOM000093372D
Original Publication Date: 1967-Sep-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Keller, SP: AUTHOR [+2]

Abstract

The display is formed by a cathode ray tube having two electron guns 10 and 12. A single layer 14 of light-emitting phosphor is coated on the face of the tube. This layer includes particles of two different phosphors, for example, Zn (S, Se); Cu and (Zn, Cd)S; Cu which respectively emit green and red light. Both phosphors can be quenched by heat. The green-emitting phosphor is quenched at a lower temperature than the red-emitting phosphor. Gun 10 is a high-voltage gun which illuminates the entire layer 14 and penetrates this layer to cause both phosphors to emit light in which case an orange output is produced across the face of the tube. Gun 12 is a low-voltage, high-current write gun which is scanned across the surface of layer 14.

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Multicolor Display

The display is formed by a cathode ray tube having two electron guns 10 and 12. A single layer 14 of light-emitting phosphor is coated on the face of the tube. This layer includes particles of two different phosphors, for example, Zn (S, Se); Cu and (Zn, Cd)S; Cu which respectively emit green and red light. Both phosphors can be quenched by heat. The green-emitting phosphor is quenched at a lower temperature than the red-emitting phosphor. Gun 10 is a high-voltage gun which illuminates the entire layer 14 and penetrates this layer to cause both phosphors to emit light in which case an orange output is produced across the face of the tube. Gun 12 is a low-voltage, high-current write gun which is scanned across the surface of layer 14. The narrow beam low-voltage energy of gun 12 is confined to the dead layer of phosphor on the surface of layer 14 so that it has the effect of heating rather than exciting the phosphors in this layer. Write gun 12 is controlled by a cathode gate voltage to determine the temperature to which the layer 14 is heated. When the write gun current is high, both phosphors are quenched and a black line scan is produced. When gun 12 scans at a lower value of applied cathode gate voltage, only the green phosphor is quenched, and a red line scan is produced.

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