US3102967A - Electron beam-intercepting structure for color image-producing cathode ray tubes - Google Patents

Electron beam-intercepting structure for color image-producing cathode ray tubes Download PDF

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Publication number
US3102967A
US3102967A US33769A US3376960A US3102967A US 3102967 A US3102967 A US 3102967A US 33769 A US33769 A US 33769A US 3376960 A US3376960 A US 3376960A US 3102967 A US3102967 A US 3102967A
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United States
Prior art keywords
stripes
color
emissive
light
index
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Expired - Lifetime
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US33769A
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English (en)
Inventor
Louis R Focht
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Maxar Space LLC
Original Assignee
Philco Ford Corp
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Publication date
Priority to NL265401D priority Critical patent/NL265401A/xx
Application filed by Philco Ford Corp filed Critical Philco Ford Corp
Priority to US33769A priority patent/US3102967A/en
Priority to FR862415A priority patent/FR1300156A/fr
Priority to GB19964/61A priority patent/GB965100A/en
Application granted granted Critical
Publication of US3102967A publication Critical patent/US3102967A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/16—Picture reproducers using cathode ray tubes
    • H04N9/22—Picture reproducers using cathode ray tubes using the same beam for more than one primary colour information
    • H04N9/24—Picture reproducers using cathode ray tubes using the same beam for more than one primary colour information using means, integral with, or external to, the tube, for producing signal indicating instantaneous beam position

Definitions

  • This invention relates to color image-producing cathode ray tubes of the index type wherein the color image is produced by successive and repetitive electron beam scanning of elements emissive of light of different primary colors, such 'as red, green and blue, and wherein an index signal is also produced which is utilized to eifect coordination between instantaneous beam modulation and beam position, such coordination being essential 'for proper color rendition.
  • Such cathode ray tubes are now well known. They are useful, for example, in color television receivers.
  • This invention relates to beam-intercepting structures or screens for such cathode ray tubes.
  • the beam-intercepting structure of a tube of this type preferably comprises phosphor stripes in successive triplets which extend transversely to the direction of line scanning motion of the electron beam, the stripes of each triplet being successively emissive of light of different colors as the beam traverses them.
  • the index signal is produced by electron beam impingement of index elements which vmay also be in the form of stripes extending transversely to the direction of line scanning. They may be composed of a iluorescent material, such as zinc oxide, having a spectral output in the non-visible light region, and the index signal may be derived ⁇ from a suitable photoelectric cell arranged, ⁇ for example, in a side wall portion of the cathode ray tube out of the path of the electron beam and facing the beam-intercepting structure. Alternatively, the index signal may be produced by secondary electron emission as Well understood in the art.
  • the index elements tend to cause product-ion of an undesirable visible pattern in the color image.
  • the index elements necessarily overlap or shadow certain of the color elements and tend to cause production of an undesirable visible pattern.
  • the principal object of the present invention is to provide an improved beam-intercepting str-ucture, the beam scanning of which does not produce a visible pattern in the color image.
  • Another object of the invention is to provide a highly eicient beam-intercepting structure.
  • the structure is caused to be non-productive of the yundesirable visible pattern in the color image by a combination of dimensioning of the shadowed elements and adding other shadowing elements.
  • the structure is caused to be non-productive of the undesirable visible pattern simply by dimensioninfg of the shadowed elements.
  • FIG. l is a greatly enlarged fragmentary sectional plan View of a beam-intercepting structure of a desirable form in which, however, the index elements cause production of the aforementioned undesirable visible pattern in the color image;
  • FIG. 2 is a similar yiew of ⁇ a beam-intercepting structure of the same general -form but embodying one form of this invention.
  • FIG. 3 is a similar view of a beam-intercepting structure embodying another form of this invention.
  • the beam-intercepting structure there shown comprises a transparent substrate 1t) on which the color phosphor stripes are deposited.
  • the substrate 19 may be the faceplate of the cathode ray tube or it may be a transparent member in proximity to the faceplate.
  • Red light-emissive phosphor stripes are shown at 1l; green light-emissive phosphor stripes are shown at 12; Iand blue light-emissive phosphor stripes are shown at 13. Since the red light-emissive phosphor is less eilicient than the green light-emissive and blue light-emissive phosphors, the stripes 11 are made wider than the stripes 12 and 13 in order to achieve white balance.
  • a conventional electron-permeable and light-reilecting layerV 1li On the ⁇ rear of the color phosphor stri-pes there is provided a conventional electron-permeable and light-reilecting layerV 1li.
  • This layer which may be composed of laluminum for example, increases the brightness of the image by rellecting toward the observer those rays of light emitted from the rear of the color phosphor stripes in response to impingement of the electron beam thereon.
  • the index stripes 15 are deposited on the layer la, ⁇ and the latter also serves to separate the index stripes from the image-producing stripes.
  • index stripes l5 disposed behind alternate spaces between the color phosphor stripes.
  • This is intended to serve twopurposes-namely, (a) to produce an index signal having a frequency 3/2)c where is the color writing frequency as explained above, and (b) to avoid shadowing of the color phosphor stripes by the index stripes.
  • a 3/21 i.e. 9 mc., index signal
  • this is a so-called ambiguous signal which is converted to a signal having the frequency f.
  • the reason for the production of the 3/2]c signal There is no need to explain here the reason for the production of the 3/2]c signal. For an explanation of this, reference may be had. to the copending application of F. P.
  • Keiper et al. Serial No. 797,684, filed March ⁇ 6, 1959, assigned to the assignee of the present application.
  • the index stripes decrease the electron irnpingement on the overlapped or shadowed color phos-l phor stripes and hence decrease the light-emission of the stripes. While this is undesirable, it necessarily results from the widening of the red light-emissive stripes 11, as may be seen in FIG. 1, which will now be explained.
  • the distance between the center lines of two consecutive red light-emissive stripes represents one cycle of color Writing, or 360 color degrees.
  • the distance d1 represents one cycle and the distance d2 represents the next cycle. Since this spacingof the red light-emissive stripes must be maintained to maintain the proper color writing frequency, increasing the width of the red light-emssive stripes necessarily decreases the width of the spaces between each of those stripes and the adjacent blue and green light-emissive stripes, resulting in overlapping or shadowing of the red light-emissive stripes by some of the index stripes. This reduces the light output of the red light-emissive stripes ⁇ and causes production of an undesirable visible pattern in the color image as will now be explained.
  • the cycle d1 is representative of alternate color cycles and the cycle d2 is representative of the other alternate color cycles. That is to say, the color cycle following d2 is the same las d1, the next color cycle is the same as d2, and so on.
  • the emitted red light output of the screen is lower than it is in the other alternate color cycles, and this produces a pattern at one-half the color writing lfrequency, i.e. 3 mc., which is within lthe resolution capability of the human eye and which appearsas Y a coarse-line structure in the color image.
  • FIG. 2 there is shown a beam-intercepting structure or screen according to one embodiment of the present invention.
  • This structure is generally of the form of that of FIG. 1 but it embodies features according to this invention.
  • the elements corresponding to those of FIG. l are'designated by the same reference numerals with ythe addition of the suix a.
  • red light-emissive stripes 11a are widened further on both sides to abut the adjacent blue and green light-emissive stripes, and additional stripes 16 are provided as shown. These stripes may have substantially the same electron transparency as the index stripes 15a but they should not interfere With the pro- Eor example, where the index stripes ⁇ are emissive of invisible light, stripes 16 y.should be composed of a material, such as an unactvated phosphor, which will not emit light.
  • FIG. 3 there is shown a beam-intercepting structure according to another embodiment of this invention.
  • 'Ihis structure is also generally similar to that of FIG. 1 and the elements are designated by the 'same reference numerals with ⁇ the sux b added.
  • the red light-emissive stripes 11b vare Widened in the areas adjacent the index stripes. While the added portion of each red phosphor stripe is shadowed, the light output is increased.
  • the index stripes are 50 percent transmissive of electrons.
  • each index stripe covers 30 color degrees of the red phosphor, which is as if 15 color degrees had been removed.v
  • FIG. 3 this is counteracted by adding 30 color degrees of red phosphor adjacent each index stripe.
  • the light output of the red light-emissive stripes is uniform in the successive color cycles. That is' to say, it is the same in the d2 color cycles as it is in the d1 rcolor cycles. Therefore as the electron beam scans the screen there is no undesirable visible pattern as in the case of FIG. 1.
  • this invention provides a screen which is non-productive of an undesirable visible pattern by equalizing the light output of the shadowed elements in successive color cycles.
  • a color image-producing screen having colored lightemissive elements which are scanned by an electron beam in successive color cycles at a predetermined color writing frequency and also having index elements at least some of which overlap portions of yelements emissive of light of a particular color and tend to produce fa visible pattern at a frequency lower than said writing frequenc said screen being characterized by structure for causing the light ⁇ output of the latter elements to be substantially uniform or equal in the successive color cycles so that lno undesirablevisible pattern is produced in the color image by virtue :of the shadowing effect of the overlapping index elements.
  • a color image-producing screen according to claim l, wherein the index elements are adjacent to and coextensive with portions of said elements emissive of light of aV particular color.
  • a color image-producing screen wherein additional elements are provided on the screen at least some ⁇ of which overlap portions of said elements emissive .of light of a particular color, said additional elements having substantially the same electron transparency as said index elements and serving to prevent production of an undesirable visible pattern in the color image.
  • a colorr image-producing screen having colored light-emissive stripes which are scanned transversely by an electron bearn in successive color cycles alt a predetermined color writing frequency and also having index stripes which in alternate color cycles overlap portions of stripes emissive of light ot a particular color and tend to produce a visible pattern at one-half the writing frequency, said screen being characterized by structure for causing the light output of the latter stripes to be substantially uniform or equal in the successive color cycles so that no ⁇ undesirable visibile pattern is produced in the color image by virtue of the shadowing effect of the overlapping index stripes in alternate color cycles.
  • An electron beam-intercepting structure for a color ⁇ image-producing cathode ⁇ ray tube comprising a transparent substrate, stripes supported by said substrate which are successively and rrepetitively emissive Iof light of different colors ⁇ in response to electron beam impingement, the stripes emissive of light of one color being wider than the other stripes, light-emissive index stripes each adjacent to and coextensive with a portion of one of said wider stripes, and other stripes not emissive of light each adjacent to and coextensive with another portion of ⁇ one of said wider stripes, said other stripes having sub-v stantially the same electron transparency as said index stripes.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US33769A 1960-06-03 1960-06-03 Electron beam-intercepting structure for color image-producing cathode ray tubes Expired - Lifetime US3102967A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NL265401D NL265401A (en(2012)) 1960-06-03
US33769A US3102967A (en) 1960-06-03 1960-06-03 Electron beam-intercepting structure for color image-producing cathode ray tubes
FR862415A FR1300156A (fr) 1960-06-03 1961-05-19 Structure d'interception de faisceau électronique pour tubes à rayons cathodiques générateurs d'image en couleurs
GB19964/61A GB965100A (en) 1960-06-03 1961-06-02 Improvements in and relating to colour-image producing cathode ray tubes

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US33769A US3102967A (en) 1960-06-03 1960-06-03 Electron beam-intercepting structure for color image-producing cathode ray tubes

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3531587A1 (de) * 1984-09-04 1986-03-13 Sony Corp., Tokio/Tokyo Kathodenstrahlfarbbildroehre mit strahlmarkierung
US5818163A (en) * 1996-03-19 1998-10-06 Samsung Display Devices Co., Ltd. Fluorescent screen pattern for beam index tube and beam index tube including the pattern

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2633547A (en) * 1950-06-30 1953-03-31 Rca Corp Two-sided electron-sensitive screen
US2644855A (en) * 1950-12-28 1953-07-07 Philco Corp Cathode-ray tube system utilizing indexing signals
US2689269A (en) * 1951-01-26 1954-09-14 Philco Corp Electrical system
US2802964A (en) * 1953-07-10 1957-08-13 Marconi Wireless Telegraph Co Color television systems
US2899581A (en) * 1957-01-15 1959-08-11 clapp
US2945087A (en) * 1957-10-11 1960-07-12 Graham Reginald Indexing in colour television receivers

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2633547A (en) * 1950-06-30 1953-03-31 Rca Corp Two-sided electron-sensitive screen
US2644855A (en) * 1950-12-28 1953-07-07 Philco Corp Cathode-ray tube system utilizing indexing signals
US2689269A (en) * 1951-01-26 1954-09-14 Philco Corp Electrical system
US2802964A (en) * 1953-07-10 1957-08-13 Marconi Wireless Telegraph Co Color television systems
US2899581A (en) * 1957-01-15 1959-08-11 clapp
US2945087A (en) * 1957-10-11 1960-07-12 Graham Reginald Indexing in colour television receivers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3531587A1 (de) * 1984-09-04 1986-03-13 Sony Corp., Tokio/Tokyo Kathodenstrahlfarbbildroehre mit strahlmarkierung
US5818163A (en) * 1996-03-19 1998-10-06 Samsung Display Devices Co., Ltd. Fluorescent screen pattern for beam index tube and beam index tube including the pattern

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Publication number Publication date
GB965100A (en) 1964-07-29
NL265401A (en(2012))

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