Claims
- 1. A picture display device comprising an envelope having a face plate bearing a luminescent screen comprising a multiplicity of predefined pixels, a plurality of juxtaposed sources for emitting electrons, a plurality of electron current transport ducts cooperating with the sources and extending substantially parallel to the face plate, and an active selection structure for selectively extracting electron currents from the transport ducts and for selectively directing said currents toward pixels of the luminescent screen, said active selection structure comprising:
- a. a preselection structure having extraction locations which can be activated and communicate row-by-row with the transport ducts;
- b. a selection plate having selection apertures which can be activated and are each associated with at least one of said pixels, each activatable extraction location of the preselection structure being associated with first and second apertures of the selection plate; and
- c. auxiliary electrodes, for intercepting unwanted elections, disposed along a respective electron paths from each extraction location to the associated first and second apertures of the selection plate.
- 2. A picture display device as in claim 1 where the auxiliary electrodes are located on a surface of an apertured plate disposed between the ducts and the luminescent screen.
- 3. A picture display device as in claim 2 where the apertured plate is disposed at a predetermined distance from the preselection structure.
- 4. A picture display device as in claim 1 where the preselection structure comprises a plate having apertures which become narrower with distance from the ducts.
- 5. A picture display device as in claim 2 where the auxiliary electrodes are arranged on the selection plate.
Priority Claims (1)
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9220016 |
Jan 1992 |
EPX |
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CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation of U.S. patent application 07/998,188 filed on 29 December 1992, now U.S. Pat. No. 5,489,815, which is a continuation-in-part of: U.S. patent application 07/830,951 filed on 6 February 1992, now U.S. Pat. No. 5,313,136, which is a continuation of U.S. patent application 07/528,677 filed on 24 May 1990 ab; and of U.S. patent application 07/954,949 filed on 30 September 1992 ab, which is a continuation of U.S. patent application 07/637,039 filed on 3 January 1991 ab, which is a continuation-in-part of U.S. patent application 07/528,677 filed on 24 May 1990 ab.
US Referenced Citations (2)
Number |
Name |
Date |
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5347199 |
Van Gorkom et al. |
Sep 1994 |
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5489815 |
Van Gorkom et al. |
Feb 1996 |
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Related Publications (1)
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954949 |
Sep 1992 |
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Continuations (3)
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998188 |
Dec 1992 |
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528677 |
May 1990 |
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Parent |
637039 |
Jan 1991 |
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Continuation in Parts (2)
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830951 |
Feb 1992 |
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528677 |
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