US3154715A - Beam-indexing picture display system with two sets of indexing stripes - Google Patents

Beam-indexing picture display system with two sets of indexing stripes Download PDF

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Publication number
US3154715A
US3154715A US64191A US6419160A US3154715A US 3154715 A US3154715 A US 3154715A US 64191 A US64191 A US 64191A US 6419160 A US6419160 A US 6419160A US 3154715 A US3154715 A US 3154715A
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Prior art keywords
stripes
indexing
backing layer
display
sets
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US64191A
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English (en)
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Jackson Richard Norman
Rudd Dennis Arthur
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US Philips Corp
North American Philips Co Inc
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US Philips Corp
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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

  • FIGA F V INVENTOR RICHARD N. JACKSON MNNIS A. RUDD BY M M l AGEN R. N. JACKSON EI'AL 3,154,715 BEAM-INDEXING PICTURE DISPLAY SYSTEM WITH TWO SETS OF INDEXING STRIPES Oct. 27, 1964 Filed Oct. 21, 1960 2 Sheets-Sheet 2 FIG.5
  • This invention relates to a beam-indexing picture tube for colour television display comprising a display screen formed as an iterative pattern of groups of two or more luminescent display stripes with each stripe of a group adapted to produce light in a differing colour, a backing layer formed on the electron-gun side of said screen, a first set of ultra-violet photoemissive indexing stripes parallel to said display stripes which set has the same pitch as that of said pattern, and a second set of ultraviolet photo-emissive indexing stripes of the same pitch parallel to those of the first set and interleaved therebe tween.
  • information is derived either continuously or periodically about the position of the light spot relative to the array of phosphors on the tube screen. This information is used either to maintain the correct positional relationship between the spot and the phosphor array, or to maintain the correct time relationship between the colour signal which is applied to the beam intensity control electrode and the spot position.
  • luminescent colour stripes of the display system may be associated with photo-cells so as to act also as indexing stripes.
  • the indexing stripes may all be stripes other than the visibly luminescent display stripes, for example secondary-emissive or ultra-violet emissive stripes provided solely for indexing purposes.
  • a combination of visibly and non-visibly emissive stripes may be used for indexing purposes.
  • a beam-indexing picture tube for colour television is characterized in that the first set of indexing stripes is provided on the inner side or rear of the backing layer and the second set of indexing stripes is provided on the outer side or front of the backing layer whereas said backing layer is substantially opaque to radiation emitted by any of said indexing stripes.
  • This arrangement permits one ultra-violet photo-sensitive pick-up device to be located so as to view the set of indexing stripes on the inner or gun side of the luminescent screen and another pick-up device to view the other set on the outer side or front of the screen, the arrangement being such that the radiation from the one set is substantially excluded from being received by thepick-up device pertaining to. the other set and vice versa,
  • the backing layer is opaque to radiation from any of the indexing stripes.
  • Indexing stripes forming a third set may be added but,
  • the indexing stripes of the three sets will preferably be disposed at equal distances along the screen so as to produce three partial signals out of phase with each other.
  • a beam-indexing tube having three stripes in each group of luminescent stripes for display in three colours, and only two indexing stripes for each group of three luminescent stripes, the indexing stripes of one set being symmetrically interleaved between those of the other set. Such a tube permits two partial indexing signals to be obtained which signals are apart.
  • the backing layer may be a metallic layer having the same functions as a conductive layer usually provided in picture tubes.
  • the backing layer is substantially opaque to radiation from the indexing stripes, it permits two photo-cells to be placed in such positions that each receives substantially only radiation from one set of indexing stripes, and the two sets may employ phosphors of the same composition.
  • the phosphor screen comprises triplets of stripes of the three colour phosphors red (R), green (G) and blue (B) between which guard-bands 1 are provided and a first set (U) of indexing phosphor stripes adapted to emit ultraviolet radiation forwardly.
  • a further set (V) of stripes of ultraviolet emissive phosphor is deposited on the rear or electron-gun side of the backing layer A. The disposition of these phosphors will be discussed later, but it will be noted here that each (U) stripe forms part of a guard-band 1 between the red (R) and green (G) phosphor stripes.
  • Pa and Pv are photo-cells sensitive substantially only to ultra-violet radiation.
  • cell Pu will receive radiation substantially only from stripes (U) and Pv substantially only from stripes (V).
  • the density of the backing layer A is such that substantially no radiation from stripes (U) can pass through the layer to cell Pv and vice versa.
  • two independent partial indexing signals are obtained and the phases of one or both may be shifted so that they coincide and can be added together to form the desired final indexing signal as previously described in the aforesaid patent application Serial No. 43,814.
  • this is achieved by delaying the phase of the Pv signal by 180 in device 2. Thereafter it is applied to a device 3 to which also the signal from the cell Pu is applied. Both signals are added together in the device 3' so that at the output thereof the final indexing signal is attained.
  • the indexing stripes of sets (U) and (V) of FIGURE 2 have their centres 180 apart on the basis of each colour triplet system representing a 360 cycle.
  • condition (1) this is a beam energy consideration and ensures that a phosphor at the back of the screen does not absorb electrons at the same time as the beam should be exciting a further phosphor located in front of the backing layer.
  • the guard-bands 1 occupy a relatively large area of the screen with consequent limitation of the efliciency of the system. This is overcome in the arrangement of FIGURE 3 where the width of all the stripes is doubled and the width of the guard-bands 1 is correspondingly reduced while maintaining the conditions (a) and (b).
  • ultra-violet emissive phosphor is mixed together with a colour phosphor to provide, simultaneously from the same stripe, a colour output and an invisible indexing output, the indexing stripe position consequently being coincident with the colour stripe position.
  • each blue (B) stripe may be combined with an ultra-violet (U) stripe to form a single mixed stripe having a width twice that of the stripes of FIGURE 2, and FIGURE 4 shows how such an arrangement can be made to fulfil the condition (a).
  • condition (b) it is true that the blue (B) and ultra-violet (U) components of a mixed (B-l- U) stripe take energy simultaneously from the electron beam, but this is partly compensated for by the fact that a smaller luminous output is required from the blue phosphor than from the red and green phosphors.
  • the tube screen of FIGURE 4 is suitable for the circuit of FIGURE 1.
  • FIGURES 2 to 4 are suitable for circuits in accordance with the aforesaid prior patent specification, they may be applied to other circuits requiring a plurality of partial indexing signals.
  • a suitable range of ultra-violet wavelengths is 3800-4000 A., in which case the (U) and (V) phosphors may be of the kind available commercially under the designation P16.
  • the thickness of the usual aluminium film deposited behind the phosphor layer in television picture tubes is such that the light transmission backwards is only one or two percent of the light output in the forward direction.
  • the high reflectivity of the film more than compensates for the loss in energy of electrons passing through the film.
  • Aluminium films of this thickness retain their high reflectivity for a wide range of wavelength--in fact down to 2,000 Angstroms, which is well beyond the aforesaid ultraviolet range of 3,8004,000 A.
  • FIGURE 5 which is a side elevation
  • the system in front of the screen employs a cell Pu which gathers direct radiation mainly from the upper half of the screen, radiation from the lower half being largely gathered by reflection from a mirror M extending along the lower edge of the screen.
  • This arrangement leaves a clear field for viewing the screen and also permits the overall depth of the apparatus (in the viewing direction) to be kept compact.
  • FIGURE 6 which both to the photo-cell Pu and to an observer at O (the positions of the cell and observer can, of course, be exchanged).
  • the tube axis of the arrangement of FIGURE 6 may be orientated in the vertical direction so that the cell Pu lies above'the mirror M instead of to one side.
  • a normal phosphor may be used which emits radiation situated in the blue part of the spectrum.
  • the cell Pu as shown in FIG- URE 5 mustthen be sensitive to blue radiation only so that the blue (B) phosphor stripes at the same time act as indexing stripes at the front of the screen.
  • Another possibility is to compose the material of the indexing stripes (V) at the rear of the screen such that these stripes will emit radiation situated in the violet or blue part of the spectrum.
  • the decay time of such stripes is quick enough to let them act as indexing stripes and the radiation, which is now situated in a visible part of the spectrum, is not seen by the observer 0 due to the opaque backing layer. It will be clear that in this case the cell Pu must be sensitive to the said violet or blue radiation from the stripes (V).
  • the mirror M is semi-transparent andthus provides an unobstructed central view of the screen 3 .linl
  • a display screen for a color television beam-indexing picture tube comprising an iterative pattern of a plurality of groups of luminescent display stripes with each stripe of a group being adapted to produce light or" a different color, a backing layer provided on one side of said stripes, a first set of indexing stripes parallel to said display stripes on the same side of said backing layer, and a second set of indexing stripes parallel to said display stripes on the other side of said backing layer, said first and second sets having the sure pitch as that of said iterative pattern of display stripes, said second set being interleaved with said first set, said backing layer being substantially opaque to radiation emitted by the stripes of said first and second sets.
  • a display screen comprising a transparent support member, an iterative pattern of a plurality of groups of luminescent display stripes on the electron gun side of said support member, the stripes of each group being adapted to produce light of difierent colors, a backing layer on the side of said stripes away from said support member, and first and second sets of indexing stripe means parallel to said display stripes on opposite sides of said backing layer, said first and second sets having the same pitch as that of said iterative pattern of display stripes, said first and second sets being interleaved, said backing layer being substantially opaque to radiation emitted by said indexing stripe means.
  • a display screen comprising a transparent support member, an iterative pattern of a plurality of parallel groups of parallel stripes on the electron gun side of said support member, a backing layer on the side of said stripes away from said support member, and a set of stripes parallel to the stripes of said groups on the other side of Said backing layer, the stripes of said set having the same pitch as that of said pattern, at least two of the stripes of each of said groups being luminescent display stripes adapted to produce light of difierent colors, at least one of the stripes of each of said groups being ultra-violet photo-emissive, the stripes of said'set being ultra-violet photo-emissive, the photo-emissive stripes of said groups being interleaved with the stripes of said set, said backing layer being substantially opaque to the ultra-violet radiation emitted by the photo-emissive stripes of said groups and set.
  • a color television system comprising a beam-indexing picture tube having a display screen, said display screen comprising a transparent support member, an iterative pattern of a plurality of groups of luminescent display stripes on the electron gun side of said support member, the stripes of each group being adapted to produce light of difierent colors, a backing layer on the side of said stripes away from said support member, and first and second sets of indexing stripe means parallel to said display stripes on opposite sides of said backing layer, said first and second sets having the same pitch as that of said iterative pattern of display stripes, said first and second sets being interleaved, said backing layer being substantially opaque to radiation emitted by said indexing stripe means, and first and second photo-cell means positioned to receive radiation from said first and second sets respectively.

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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)
US64191A 1959-11-16 1960-10-21 Beam-indexing picture display system with two sets of indexing stripes Expired - Lifetime US3154715A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB38769/59A GB897983A (en) 1959-11-16 1959-11-16 Improvements in or relating to beam-indexing picture display systems

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US3154715A true US3154715A (en) 1964-10-27

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US (1) US3154715A (de)
DE (1) DE1139148B (de)
GB (1) GB897983A (de)
NL (1) NL257901A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3258527A (en) * 1962-09-24 1966-06-28 Rca Corp Index signal generation
US3497758A (en) * 1964-08-10 1970-02-24 Clayton A Washburn Error correction system for cathode-ray tube information display
US4507585A (en) * 1981-09-18 1985-03-26 Hitachi, Ltd. Beam-indexing color picture tube arrangement
US4654559A (en) * 1984-09-18 1987-03-31 Sanyo Electric Co., Ltd. Flat color cathode-ray tube
US4720655A (en) * 1984-09-17 1988-01-19 Sanyo Electric Co., Ltd. Flat color cathode-ray tube with phosphor index stripes

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1121908A (en) * 1978-11-24 1982-04-13 Kinya Shinkai Beam index color cathode ray tube

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2945087A (en) * 1957-10-11 1960-07-12 Graham Reginald Indexing in colour television receivers

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2945087A (en) * 1957-10-11 1960-07-12 Graham Reginald Indexing in colour television receivers

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3258527A (en) * 1962-09-24 1966-06-28 Rca Corp Index signal generation
US3497758A (en) * 1964-08-10 1970-02-24 Clayton A Washburn Error correction system for cathode-ray tube information display
US4507585A (en) * 1981-09-18 1985-03-26 Hitachi, Ltd. Beam-indexing color picture tube arrangement
US4720655A (en) * 1984-09-17 1988-01-19 Sanyo Electric Co., Ltd. Flat color cathode-ray tube with phosphor index stripes
US4654559A (en) * 1984-09-18 1987-03-31 Sanyo Electric Co., Ltd. Flat color cathode-ray tube

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GB897983A (en) 1962-06-06
NL257901A (de)
DE1139148B (de) 1962-11-08

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