Thin-type picture display device

Claim 2

A picture display device comprising an evacuable envelope and including a face plate bearing a luminescent screen and means for selectively directing electrons toward the screen for producing a picture composed of pixels, said means comprising: a. at least one electron source; b. a plurality of adjacent, longitudinally extending transport ducts having respective walls comprising an electrically insulating material having a predetermined secondary emission coefficient, said ducts each having: (1) an input portion in communication with the at least one electron source for receiving electrons; and (2) means for affecting the transport of the electrons longitudinally through the duct by means of secondary emission to establish a substantially uniform electron current within a predefined length of said duct; and c. selection plate means including: (1) a first plurality of apertures disposed along said predefined lengths and providing respective passageways for withdrawal of electrons from the transport ducts; (2) first selection means for effecting the passage of electrons from the ducts through selected ones of the first plurality of apertures for transport toward the screen; (3) a second plurality of apertures providing respective passageways to the transport ducts from the at least one electron source; and (4) second selection means for effecting the passage of electrons from the at least one electron source through selected once of the second plurality of apertures and into the ducts.

Claim 3

A picture display device as in claim 1 where the at least one electron source is supported by the selection plate means.

Claim 4

A picture display device as in claim 1 where the second selection means comprises a plurality of electrodes disposed on the selection plate means and having apertures aligned with the second plurality of apertures.

Claim 5

A picture display device as in claim 3 where the at least one electron source is disposed proximate an edge of the selection plate means.

Claim 6

A picture display device as in claim 4 including a rear plate connected to the face plate by means of a plurality of partitions, said edge extending beyond at least one of the partitions.

Claim 7

A picture display device as in claim 1 where the first plurality of apertures are arranged along parallel lines extending transversely of the transport ducts.

Claim 8

A picture display device as in claim 6 where the selection plate means is spaced from the face plate by means of a plurality of mutually parallel walls disposed between adjacent ones of the first plurality of apertures.

Claim 9

A picture display device as in claim 7 where the plurality of mutually parallel walls extend transversely of the parallel lines along which the the first plurality of apertures are arranged.

Claim 10

A picture display device as in claim 8 where the first plurality of apertures includes, along each parallel line, at least first and second extraction apertures for each duct, and where the first selection means comprises at least first and second systems of electrodes disposed on the selection plate means and having, for each parallel line of apertures, respective first and second apertures aligned with the first and second extraction apertures for each duct.

Claim 11

A picture display device as in claim 6 where the screen comprises a predetermined number N of materials for luminescing in respective colors, and where the number of parallel lines of apertures substantially corresponds to N times a number of raster lines to be displayed on the screen.

Claim 12

A picture display device as in claim 1 where the selection plate means includes a preselection plate having the first and second pluralities of apertures, and a fine selection plate disposed between the preselection plate and the face plate and having at least two apertures associated with each of said first plurality of apertures.

Claim 13

A picture display device as in claim 1 where one side of the selection plate means forms one wall of each duct.

Claim 14

A picture display device comprising an evacuable envelope and including a face plate bearing a luminescent screen and means for selectively directing electrons toward the screen for producing a picture composed of pixels, said means comprising: a. an arrangement of juxtaposed electron sources; b. a plurality of adjacent, longitudinally extending transport ducts arranged in columns and having respective walls comprising an electrically insulating material having a predetermined secondary emission coefficient, said ducts each having: (1) an input portion in communication with the at least one electron source for receiving electrons; and (2) means for effecting the transport of the electrons longitudinally through the duct by means of secondary emission to establish a substantially uniform electron current within a predefined length of said duct; and c. selection plate means including: (1) a first plurality of apertures disposed along said predefined lengths and arranged in rows extending transversely of said columns and providing respective passageways between the transport ducts and the screen; (2) first selection means for effecting the extraction of electrons from the ducts through selected ones of the first plurality of apertures and toward the screen; (3) a second plurality of apertures providing respective passageways between the transport ducts and the electron sources; and (4) second selection means for effecting the passage of electrons from the electron sources through selected ones of the second plurality of apertures and into the ducts.

Claim 15

A picture display device comprising an evacuable envelope and including a face plate bearing a luminescent screen and means for selectively directing electrons toward the screen for producing a picture composed of pixels, said means comprising: a. an arrangement of juxtaposed electron sources; b. a plurality of adjacent, longitudinally extending transport ducts arranged in columns and having respective walls comprising an electrically insulating material having a predetermined secondary emission coefficient, said ducts each having: (1) an input portion in communication with the at least one electron source for receiving electrons; and (2) means for effecting the transport of the electrons longitudinally through the duct by means of secondary emission to establish a substantially uniform electron current within a predefined length of said duct; and c. selection plate means including: (1) a first plurality of apertures disposed along said predefined lengths and arranged in rows extending transversely of said columns and providing respective passageways between the transport ducts and the screen; (2) first selection means for effecting the extraction of electrons from the ducts through selected ones of the first plurality of apertures and toward the screen; (3) a second plurality of apertures providing respective passageways between the transport ducts and the electron sources; and (4) second selection means for effecting the passage of electrons from the electron sources through selected ones of the second plurality of apertures and into the ducts.

Claim 16

A picture display device as in claim 13 where the electron sources are supported by the selection plate means.

Claim 17

A picture display device as in claim 13 where the second selection means comprises a plurality of electrodes disposed on the selection plate means and having apertures aligned with the second plurality of apertures.

Claim 18

A picture display device as in claim 15 where the electron sources are disposed proximate an edge of the selection plate means.

Claim 19

A picture display device as in claim 16 including a rear plate connected to the face plate by means of a plurality of partitions, said edge extending beyond at least one of the partitions.

Claim 20

A picture display device as in claim 13 where the rows of the first plurality of apertures are arranged along parallel lines extending transversely of the transport ducts.

Claim 21

A picture display device as in claim 18 where the selection plate means is spaced from the face plate by means of a plurality of mutually parallel walls disposed between adjacent ones of the first plurality of apertures.

Claim 22

A picture display device as in claim 19 where the plurality of mutually parallel walls extend transversely of the parallel lines along which the the first plurality of apertures are arranged.

Claim 23

A picture display device as in claim 20 where the first plurality of apertures includes, along each parallel line, at least first and second extraction apertures for each duct, and where the first selection means comprise at least first and second systems of electrodes disposed on the selection plate means and having, for each parallel line of apertures, respective first and second apertures aligned with the first and second extraction apertures for each duct.

Claim 24

A picture display device as in claim 18 where the screen comprises a predetermined number N of materials for luminescing in respective colors, and where the number of parallel lines of apertures substantially corresponds to N times a number of raster lines to be displayed on the screen.

Claim 25

A picture display device as in claim 13 where the selection plate means includes a preselection plate having the first and second pluralities of apertures, and a fine selection plate disposed between the preselection plate and the face plate and having at least two apertures associated with each of said first plurality of apertures.

Claim 26

A picture display device as in claim 13 where one side of the selection plate means forms one wall of each duct.

Claim 27

A picture display device comprising an evacuable envelope and including a face plate bearing a luminescent screen and means for selectively directing electrons toward the screen for producing a picture composed of pixels, said means comprising: a. at least one electron source; b. a plurality of adjacent, longitudinally extending transport ducts arranged in columns and having respective walls comprising an electrically insulating material having a predetermined secondary emission coefficient, said ducts each having: (1) an input portion in communication with the at least one electron source through an input aperture in a longitudinal duct wall for receiving electrons; and (2) means for effecting the transport of the electrons longitudinally through the duct by means of secondary emission to establish a substantially uniform electron current within a predefined length of said duct; c. selection means including: (1) a first plurality of apertures disposed along said predefined lengths and arranged in rows extending transversely of said columns and providing respective passageways between the transport ducts and the screen; and (2) first selection means for effecting the extraction of electrons from the ducts through selected ones of the first plurality of apertures and toward the screen; and (3) second selection means for effecting the passage of electrons from the at least one electron source through selected ones of the input apertures and into the ducts.

Claim 28

A picture display device comprising an evacuable envelope and including a face plate bearing a luminescent screen and means for selectively directing electrons toward the screen for producing a picture composed of pixels, said means comprising: a. at least one electron source; b. a plurality of adjacent, longitudinally extending transport ducts arranged in columns and having respective walls comprising an electrically insulating material having a predetermined secondary emission coefficient, said ducts each having: (1) an input portion in communication with the at least one electron source through an input aperture in a longitudinal duct wall for receiving electrons; and (2) means for effecting the transport of the electrons longitudinally through the duct by means of secondary emission to establish a substantially uniform electron current within a predefined length of said duct; c. selection means including: (1) a first plurality of apertures disposed along said predefined lengths and arranged in rows extending transversely of said columns and providing respective passageways between the transport ducts and the screen; and (2) first selection means for effecting the extraction of electrons from the ducts through selected ones of the first plurality of apertures and toward the screen; and (3) second selection means for effecting the passage of electrons from the at least one electron source through selected ones of the input apertures and into the ducts.

Claim 29

A picture display device comprising an evacuable envelope and including a face plate bearing a luminescent screen and means for selectively directing electrons toward the screen for producing a picture composed of pixels, said means comprising: a. at least one electron source; b. a plurality of adjacent, longitudinally extending transport ducts arranged in columns and having respective walls comprising an electrically insulating material having a predetermined secondary emission coefficient, said ducts each having: (1) an input portion in communication with the at least one electron source for receiving electrons; and (2) means for effecting the transport of the electrons longitudinally through the duct by means of secondary emission to establish a substantially uniform electron current within a predefined length of said duct; c. selection means including: (1) a first plurality of apertures disposed along said predefined lengths and arranged in rows extending transversely of said columns and providing respective passageways between the transport ducts and the screen; and (2) first selection means for effecting the extraction of electrons from the ducts through selected ones of the first plurality of apertures and toward the screen; and d. a front spacer arranged adjacent the luminescent screen, said front spacer having walls of a material having a secondary emission coefficient which, for electron energies above a predetermined magnitude, is so low that in operation there is substantially no field emission.

Claim 30

A picture display device comprising an evacuable envelope and including a face plate bearing a luminescent screen and means for selectively directing electrons toward the screen for producing a picture composed of pixels, said means comprising: a. at least one electron source; b. a plurality of adjacent, longitudinally extending transport ducts arranged in columns and having respective walls comprising an electrically insulating material having a predetermined secondary emission coefficient, said ducts each having: (1) an input portion in communication with the at least one electron source for receiving electrons; and (2) means for effecting the transport of the electrons longitudinally through the duct by means of secondary emission to establish a substantially uniform electron current within a predefined length of said duct; c. selection means including: (1) a first plurality of apertures disposed along said predefined lengths and arranged in rows extending transversely of said columns and providing respective passageways between the transport ducts and the screen; and (2) first selection means for effecting the extraction of electrons from the ducts through selected ones of the first plurality of apertures and toward the screen; and d. a front spacer arranged adjacent the luminescent screen, said front spacer having walls of a material having a secondary emission coefficient which, for electron energies above a predetermined magnitude, is so low that in operation there is substantially no field emission.

Claim 31

A picture display device comprising an evacuable envelope and including a face plate bearing a luminescent screen and means for selectively directing electrons toward the screen, said means comprising: a. at least one electron source; b. a plurality of adjacent, longitudinally extending transport ducts arranged in columns and having respective walls comprising an electrically insulating material having a predetermined secondary emission coefficient, said ducts each having: (1) an input portion in communication with the at least one electron source for receiving electrons; and (2) means for effecting the transport of the electrons longitudinally through the duct by means of secondary emission to establish a substantially uniform electron current within a predefined length of said duct; and c. selection means including: (1) a first plurality of apertures disposed along said predefined lengths and arranged in rows extending transversely of said columns and providing respective passageways between the transport ducts and the screen; and (2) first selection means for effecting the extraction of electrons from the ducts through selected ones of the first plurality of apertures and toward the screen for producing a picture composed of pixels, the pixel spacing along respective lines transverse to the longitudinal axes of the transport ducts being substantially smaller than the pitch of the transport ducts.

Claim 32

A picture display device comprising an evacuable envelope and including a face plate bearing a luminescent screen and means for selectively directing electrons toward the screen, said means comprising: a. at least one electron source; b. a plurality of adjacent, longitudinally extending transport ducts arranged in columns and having respective walls comprising an electrically insulating material having a predetermined secondary emission coefficient, said ducts each having: (1) an input portion in communication with the at least one electron source for receiving electrons; and (2) means for effecting the transport of the electrons longitudinally through the duct by means of secondary emission to establish a substantially uniform electron current within a predefined length of said duct; and c. selection means including: (1) a first plurality of apertures disposed along said predefined lengths and arranged in rows extending transversely of said columns and providing respective passageways between the transport ducts and the screen; and (2) first selection means for effecting the extraction of electrons from the ducts through selected ones of the first plurality of apertures and toward the screen for producing a picture composed of pixels, the pixel spacing along respective lines transverse to the longitudinal axes of the transport ducts being substantially smaller than the pitch of the transport ducts.

Claim 33

A picture display device comprising an evacuable envelope and including a face plate bearing a luminescent screen and means for selectively directing electrons toward the screen for producing a picture composed of pixels, said means comprising: a. at least one electron source; b. a plurality of adjacent, longitudinally extending transport ducts arranged in columns and having respective walls comprising an electrically insulating material having a predetermined secondary emission coefficient, said ducts each having: (1) an input portion in communication with the at least one electron source for receiving electrons; and (2) means for effecting the transport of the electrons longitudinally through the duct by means of secondary emission to establish a substantially uniform electron current within a predefined length of said duct; and (3) a plurality of rows of apertures disposed along said predefined length and extending transversely of said columns and providing respective passageways between the transport duct and the screen; and c. selection means for effecting the extraction of electrons from the ducts through selected ones of the apertures and toward the screen.

Claim 34

A picture display device comprising an evacuable envelope and including a face plate bearing a luminescent screen and means for selectively directing electrons toward the screen for producing a picture composed of pixels, said means comprising: a. at least one electron source; b. a plurality of adjacent, longitudinally extending transport ducts arranged in columns and having respective walls comprising an electrically insulating material having a predetermined secondary emission coefficient, said ducts each having: (1) an input portion in communication with the at least one electron source for receiving electrons; and (2) means for effecting the transport of the electrons longitudinally through the duct by means of secondary emission to establish a substantially uniform electron current within a predefined length of said duct; and (3) a plurality of rows of apertures disposed along said predefined length and extending transversely of said columns and providing respective passageways between the transport duct and the screen; and c. selection means for effecting the extraction of electrons from the ducts through selected ones of the apertures and toward the screen.

Claim 35

A picture display device comprising evacuable envelope and including a face plate bearing a luminescent screen and means for selectively directing electrons toward the screen for producing a picture composed of pixels, said means comprising: a. at least one electron source; b. a plurality of adjacent, longitudinally extending transport ducts arranged in columns and having respective walls comprising an electrically insulating material having a predetermined secondary emission coefficient, said ducts each having: (1) an input portion in communication with the at least one electron source for receiving electrons; and (2) means for effecting the transport of the electrons longitudinally through the duct by means of secondary emission to establish a substantially uniform electron current within a predefined length of said duct; and c. selection means including a plurality of extraction locations disposed along said predefined lengths and arranged in rows extending transversely of said columns and providing respective passageways between the transport ducts and the screen, there being two selectively drivable extraction apertures per extraction location.

Claim 36

A picture display device comprising evacuable envelope and including a face plate bearing a luminescent screen and means for selectively directing electrons toward the screen for producing a picture composed of pixels, said means comprising: a. at least one electron source; b. a plurality of adjacent, longitudinally extending transport ducts arranged in columns and having respective walls comprising an electrically insulating material having a predetermined secondary emission coefficient, said ducts each having: (1) an input portion in communication with the at least one electron source for receiving electrons; and (2) means for effecting the transport of the electrons longitudinally through the duct by means of secondary emission to establish a substantially uniform electron current within a predefined length of said duct; and c. selection means including a plurality of extraction locations disposed along said predefined lengths and arranged in rows extending transversely of said columns and providing respective passageways between the transport ducts and the screen, there being two selectively drivable extraction apertures per extraction location.

Claim 37

A picture display device comprising an evacuable envelope and including a face plate bearing a luminescent screen and means for selectively directing electrons toward the screen for producing a picture composed of pixels, said means comprising: a. at least one electron source; b. a plurality of adjacent, longitudinally extending transport ducts arranged in columns and having respective walls comprising an electrically insulating material having a predetermined secondary emission coefficient, said ducts each having: (1) an input portion in communication with the at least one electron source for receiving electrons; and (2) means for effecting the transport of the electrons longitudinally through the duct by means of secondary emission to establish a substantially uniform electron current within a predefined length of said duct; c. selection means including: (1) a first plurality of apertures disposed along said predefined lengths and arranged in rows extending transversely of said columns and providing respective passageways between the transport ducts and the screen; and (2) first selection means for effecting the extraction of electrons from the ducts through selected ones of the first plurality of apertures and toward the screen; and d. measuring means for checking the uniformity of the electron currents established in the respective ducts.

Claim 38

A picture display device comprising an evacuable envelope and including a face plate bearing a luminescent screen and means for selectively directing electrons toward the screen for producing a picture composed of pixels, said means comprising: a. at least one electron source; b. a plurality of adjacent, longitudinally extending transport ducts arranged in columns and having respective walls comprising an electrically insulating material having a predetermined secondary emission coefficient, said ducts each having: (1) an input portion in communication with the at least one electron source for receiving electrons; and (2) means for effecting the transport of the electrons longitudinally through the duct by means of secondary emission to establish a substantially uniform electron current within a predefined length of said duct; c. selection means including: (1) a first plurality of apertures disposed along said predefined lengths and arranged in rows extending transversely of said columns and providing respective passageways between the transport ducts and the screen; and (2) first selection means for effecting the extraction of electrons from the ducts through selected ones of the first plurality of apertures and toward the screen; and d. measuring means for checking the uniformity of the electron currents established in the respective ducts.

Claim 39

A picture display device comprising an evacuable envelope and including a face plate bearing a luminescent screen and means for selectively directing electrons toward the screen for producing a picture composed of pixels, said means comprising: a. at least one electron source; b. a plurality of adjacent, longitudinally extending transport ducts arranged in columns and having respective walls comprising an electrically insulating material having a predetermined secondary emission coefficient, said ducts each having: (1) an input portion in communication with the at least one electron source for receiving electrons; and (2) means for effecting the transport of the electrons longitudinally through the duct by means of secondary emission to establish a substantially uniform electron current within a predefined length of said duct; and (3) first and second walls disposed closer and further, respectively, from the face plate, an auxiliary electrode for helping the electron transport being disposed on said second wall in the proximity of the input portion; c. selection means including: (1) a first plurality of apertures disposed in the first walls along said predefined lengths and arranged in rows extending transversely of said columns and providing respective passageways between the transport ducts and the screen; and (2) first selection means for effecting the extraction of electrons from the ducts through selected ones of the first plurality of apertures and toward the screen.

Claim 40

A picture display device comprising an evacuable envelope and including a face plate bearing a luminescent screen and means for selectively directing electrons toward the screen for producing a picture composed of pixels, said means comprising: a. at least one electron source; b. a plurality of adjacent, longitudinally extending transport ducts arranged in columns and having respective walls comprising an electrically insulating material having a predetermined secondary emission coefficient, said ducts each having: (1) an input portion in communication with the at least one electron source for receiving electrons; and (2) means for effecting the transport of the electrons longitudinally through the duct by means of secondary emission to establish a substantially uniform electron current within a predefined length of said duct; and (3) first and second walls disposed closer and further, respectively, from the face plate, an auxiliary electrode for helping the electron transport being disposed on said second wall in the proximity of the input portion; c. selection means including: (1) a first plurality of apertures disposed in the first walls along said predefined lengths and arranged in rows extending transversely of said columns and providing respective passageways between the transport ducts and the screen; and (2) first selection means for effecting the extraction of electrons from the ducts through selected ones of the first plurality of apertures and toward the screen.

Claim 41

A picture display device comprising an evacuable envelope and including a face plate bearing a luminescent screen and means for selectively directing electrons toward the screen for producing a picture composed of pixels, said means comprising: a. at least one electron source; b. a plurality of adjacent, longitudinally extending transport ducts arranged in columns and having respective walls comprising an electrically insulating material having a predetermined secondary emission coefficient, said ducts each having: (1) an input portion in communication with the at least one electron source for receiving electrons; and (2) means for effecting the transport of the electrons longitudinally through the duct by means of secondary emission to establish a substantially uniform electron current within a predefined length of said duct; and c. selection means including: (1) a plurality of apertures disposed along said predefined lengths and arranged in rows extending transversely of said columns and providing respective passageways between the transport ducts and the screen; and (2) rows of selection electrodes for effecting the extraction of electrons from the ducts through respective selected rows of the plurality of apertures and toward the screen, alternate rows of the selection electrodes including means for connection with external circuitry near one edge of the selection means and rows of the selection electrodes disposed between said alternate rows including means for connection with external circuitry near an opposite edge of the selection means.

Claim 42

A picture display device comprising an evacuable envelope and including a face plate bearing a luminescent screen and means for selectively directing electrons toward the screen for producing a picture composed of pixels, said means comprising: a. at least one electron source; b. a plurality of adjacent, longitudinally extending transport ducts arranged in columns and having respective walls comprising an electrically insulating material having a predetermined secondary emission coefficient, said ducts each having: (1) an input portion in communication with the at least one electron source for receiving electrons; and (2) means for effecting the transport of the electrons longitudinally through the duct by means of secondary emission to establish a substantially uniform electron current within a predefined length of said duct; and c. selection means including: (1) a plurality of apertures disposed along said predefined lengths and arranged in rows extending transversely of said columns and providing respective passageways between the transport ducts and the screen; and (2) rows of selection electrodes for effecting the extraction of electrons from the ducts through respective selected rows of the plurality of apertures and toward the screen, alternate rows of the selection electrodes including means for connection with external circuitry near one edge of the selection means and rows of the selection electrodes disposed between said alternate rows including means for connection with external circuitry near an opposite edge of the selection means.

Claim 43

A picture display device comprising an evacuable envelope and including a face plate bearing a luminescent screen and means for selectively directing electrons toward the screen for producing a picture composed of pixels, said means comprising: a. at least one electron source; b. a plurality of adjacent, longitudinally extending transport ducts arranged in columns and having respective walls comprising an electrically insulating material having a predetermined secondary emission coefficient, said ducts each having: (1) an input portion in communication with the at least one electron source for receiving electrons; and (2) means for effecting the transport of the electrons longitudinally through the duct by means of secondary emission to establish a substantially uniform electron current within a predefined length of said duct; c. selection means including: (1) a plurality of apertures providing respective passageways between the transport ducts and the screen; and (2) selection electrodes for effecting the extraction of electrons through selected ones of the plurality of apertures; and d. means for producing an accelerating electric field between the selection means and the luminescent screen for accelerating electrons toward the screen, the dimensions of said apertures being selected to prevent penetration of the accelerating electric field.

Claim 44

A picture display device comprising an evacuable envelope and including a face plate bearing a luminescent screen and means for selectively directing electrons toward the screen for producing a picture composed of pixels, said means comprising: a. at least one electron source; b. a plurality of adjacent, longitudinally extending transport ducts arranged in columns and having respective walls comprising an electrically insulating material having a predetermined secondary emission coefficient, said ducts each having: (1) an input portion in communication with the at least one electron source for receiving electrons; and (2) means for effecting the transport of the electrons longitudinally through the duct by means of secondary emission to establish a substantially uniform electron current within a predefined length of said duct; c. selection means including: (1) a plurality of apertures providing respective passageways between the transport ducts and the screen; and (2) selection electrodes for effecting the extraction of electrons through selected ones of the plurality of apertures; and d. means for producing an accelerating electric field between the selection means and the luminescent screen for accelerating electrons toward the screen, the dimensions of said apertures being selected to prevent penetration of the accelerating electric field.

Claim 45

A picture display device as in claim 25, 26, 27, 28, 29, 30, 31, 32 or 33 where the means for effecting the transport of the electrons comprises a resistive layer disposed along the duct length.

Claim 46

A picture display device as in claim 25, 26, 27, 28, 29 30, 31, 32 or 33 where the selection means comprises an apertured selection plate means.

Claim 47

A picture display device as in claim 25, 26, 27, 28, 29, 30, 31, 32 or 33 where the at least one electron source comprises an arrangement of juxtaposed electron sources.

Claim 48

A picture display device as in claim 25 where the selection means comprises an apertured selection plate means which includes the input apertures and the first plurality of apertures.

Claim 49

A picture display device as in claim 1 or 13 where the selection plate means includes a preselection plate having the first plurality of apertures and a fine selection plate disposed between the preselection plate and the face plate, said fine selection plate including: a. a first plurality of apertures arranged for receiving electrons from respective ones of the first plurality of apertures in the preselection plate; b. a second plurality of apertures arranged for receiving electrons from the same respective ones of the first plurality of apertures in said preselection plate; c. a first plurality of fine selection electrodes disposed proximate respective ones of the first plurality of apertures; d. a second plurality of fine selection electrodes disposed proximate respective ones of the second plurality of apertures.

Claim 50

A picture display device as in claim 38 where the first plurality of fine selection electrodes are electrically connected together and where the second plurality of fine selection electrodes are electrically connected together.

Claim 51

A picture display device as in claim 1 or 13 where the selection plate means includes a preselection plate having the first plurality of apertures and a fine selection plate disposed between the preselection plate and the face plate, said fine selection plate including, for each of said plurality of apertures: a. first, second and third apertures arranged for selectively passing electrons received from the respective aperture in the preselection plate; and b. first, second and third fine selection electrodes disposed proximate respective ones of the first, second and third apertures for effecting said selective passage of electrons through said apertures.

Claim 52

A picture display device as in claim 40 where the first plurality of fine selection electrodes are electrically connected together, the second plurality of fine selection electrodes are electrically connected together, and the third plurality of fine selection electrodes are electrically connected together.