GB710786A - Arrangement for improving the contrast of luminous screen images - Google Patents

Arrangement for improving the contrast of luminous screen images

Info

Publication number
GB710786A
GB710786A GB29859/51A GB2985951A GB710786A GB 710786 A GB710786 A GB 710786A GB 29859/51 A GB29859/51 A GB 29859/51A GB 2985951 A GB2985951 A GB 2985951A GB 710786 A GB710786 A GB 710786A
Authority
GB
United Kingdom
Prior art keywords
filter
screen
contrast
improving
arrangement
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
GB29859/51A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB710786A publication Critical patent/GB710786A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/89—Optical or photographic arrangements structurally combined or co-operating with the vessel
    • H01J29/898—Spectral filters

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

710,786. Polarizing apparatus. STANDARD TELEPHONES & CABLES, Ltd. Dec. 20, 1951 (Feb. 17, 1951], No. 29859/51. Class 97(1) [Also in Group XL(b)] The contrast of a luminous screen image, such as a television image formed on the screen of a cathode ray tube L, is improved in the presence of external light by placing a plane polarized filter P in-front of the screen. The filter may be used alone or in conjunction with corresponding filters, such as P1, placed in front of the sources of external light. The filters are arranged to be rotatable so that their planes may be set perpendicular to each other. The filter P can be formed on the screen of the cathode ray tube. Alternatively it may be formed on a glass or similar transparent disc as may be mounted between two such discs. Fig. 2 (not shown) illustrates a construction in which the filter is supported in a rotatable holder attached to the front panel of the television set. Herapatite is referred to as a suitable. polarizing material.
GB29859/51A 1951-02-17 1951-12-20 Arrangement for improving the contrast of luminous screen images Expired GB710786A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE710786X 1951-02-17

Publications (1)

Publication Number Publication Date
GB710786A true GB710786A (en) 1954-06-16

Family

ID=6619394

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29859/51A Expired GB710786A (en) 1951-02-17 1951-12-20 Arrangement for improving the contrast of luminous screen images

Country Status (1)

Country Link
GB (1) GB710786A (en)

Similar Documents

Publication Publication Date Title
GB572338A (en) Viewing device for cathode ray tube screens
GB562168A (en) Improvements in colour television
GB534973A (en) Improvements in or relating to television receivers
GB710786A (en) Arrangement for improving the contrast of luminous screen images
ES418656A1 (en) Optical multiple projector
GB897983A (en) Improvements in or relating to beam-indexing picture display systems
GB722501A (en) Improvements in and relating to television receivers
GB810181A (en) Television apparatus
GB708365A (en) Improvements in or relating to viewing windows for cathode ray tube apparatus
GB539428A (en) Improvements in or relating to luminescent screens
GB680318A (en) Improvements in television receivers
GB695001A (en) Multi-coloured filter
GB491886A (en) Improvements in or relating to television and like receivers
GB1268808A (en) Animation system for visual communication means
CA470550A (en) Rear projection viewing screens
GB594327A (en) Color flicker reducing apparatus for color television receivers
AU416217B2 (en) High contrast cathode ray tube viewing screen
THOMAS Micromesh filters for contrast enhancement of electronic displays(Image contrast enhancement of cathode ray tube cockpit displays with micromesh optical filters)
GB578108A (en) Improvements in apparatus for displaying optical images
GB490523A (en) Improvements in or relating to television apparatus
CA507626A (en) Light reflecting screen for cathode ray tubes
AU2570767A (en) High contrast cathode ray tube viewing screen
CA495604A (en) Black screen television cathode ray tube
GB521904A (en) Bi-visual fluoroscope
CA497047A (en) Fluorescent light screen