GB895773A - Improvements in and relating to colour television systems - Google Patents

Improvements in and relating to colour television systems

Info

Publication number
GB895773A
GB895773A GB29784/58A GB2978458A GB895773A GB 895773 A GB895773 A GB 895773A GB 29784/58 A GB29784/58 A GB 29784/58A GB 2978458 A GB2978458 A GB 2978458A GB 895773 A GB895773 A GB 895773A
Authority
GB
United Kingdom
Prior art keywords
strips
colour
indexing
layer
photo
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB29784/58A
Inventor
Reginald Graham
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SYLVANIA THORN COLOUR TELEVISION LABORATORIES Ltd
Original Assignee
SYLVANIA THORN COLOUR TELEVISION LABORATORIES Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SYLVANIA THORN COLOUR TELEVISION LABORATORIES Ltd filed Critical SYLVANIA THORN COLOUR TELEVISION LABORATORIES Ltd
Priority to GB29784/58A priority Critical patent/GB895773A/en
Publication of GB895773A publication Critical patent/GB895773A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)

Abstract

895,773. Colour television tubes. SYLVANIA-THORN COLOUR TELEVISION LABORATORIES Ltd. Oct. 19, 1959 [Sept. 17, 1958], No. 29784/58. Class 39(1). In a colour television receiver tube having a multi-colour strip screen, the screen includes a layer of photo-emissive material selectively responsive only to certain of the strips which act as indexing strips. The emitted electrons pass to a collecting coating on the wall of the tube and the indexing signal is derived directly from this coating or from an aluminium coating on the screen, or indirectly from the coating on the tube wall by coupling to an exterior overlying coating. In Fig. 1 the screen includes colour strips R, G, B, guard strips A of a phosphor which does not emit light, a transparent aluminium layer 11 and the photo-emissive layer 12. The exciting radiation for the photo-emissive layer may be the light emitted by one of the colour strips, or a phosphor emitting the exciting radiation may be mixed with the phosphor of certain of the strips R, G, B or A. The indexing strips may emit ultra-violet radiation, the photoemissive layer being responsive only to this radiation. Alternatively, or in addition, a colour filter passing only the desired radiation may be provided between the phosphor strips and the photo-emissive layer. The colour strips may be of phosphors having a long afterglow compared with the indexing strips so that the colour strips produce a negligible effect. The indexing strips may be spaced by distances not equal to those between the groups of colour strips, as described in Specification 895,772, so that the frequencies generated by scanning the colour and indexing strips respectively are different. In Fig. 3 a layer 11<SP>1</SP> of a material, e.g. aluminium, opaque to the light emitted by the colour strips is applied over the colour phosphor strips R, G, B. The indexing strips 1 are applied over the aluminium layer 11<SP>1</SP> and finally the photo-emissive layer 12 is applied. The photo-emissive layer may be continuous or applied in strips over the indexing strips.
GB29784/58A 1958-09-17 1958-09-17 Improvements in and relating to colour television systems Expired GB895773A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB29784/58A GB895773A (en) 1958-09-17 1958-09-17 Improvements in and relating to colour television systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB29784/58A GB895773A (en) 1958-09-17 1958-09-17 Improvements in and relating to colour television systems

Publications (1)

Publication Number Publication Date
GB895773A true GB895773A (en) 1962-05-09

Family

ID=10297107

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29784/58A Expired GB895773A (en) 1958-09-17 1958-09-17 Improvements in and relating to colour television systems

Country Status (1)

Country Link
GB (1) GB895773A (en)

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