ES2076309T3 - Circuito de control de un haz de tubo de rayos catodicos. - Google Patents

Circuito de control de un haz de tubo de rayos catodicos.

Info

Publication number
ES2076309T3
ES2076309T3 ES90304128T ES90304128T ES2076309T3 ES 2076309 T3 ES2076309 T3 ES 2076309T3 ES 90304128 T ES90304128 T ES 90304128T ES 90304128 T ES90304128 T ES 90304128T ES 2076309 T3 ES2076309 T3 ES 2076309T3
Authority
ES
Spain
Prior art keywords
rate
responsive
control signal
excursion
signal
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 - Lifetime
Application number
ES90304128T
Other languages
English (en)
Inventor
Gene Karl Sendelweck
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.)
Technicolor USA Inc
Original Assignee
Thomson Consumer Electronics Inc
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 Thomson Consumer Electronics Inc filed Critical Thomson Consumer Electronics Inc
Application granted granted Critical
Publication of ES2076309T3 publication Critical patent/ES2076309T3/es
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/44Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/57Control of contrast or brightness
    • H04N5/59Control of contrast or brightness in dependence upon beam current of cathode ray tube
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/14Picture signal circuitry for video frequency region
    • H04N5/141Beam current control means

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Receiver Circuits (AREA)
  • Details Of Television Scanning (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

ESTE INVENTO SE REFIERE GENERALMENTE AL CAMPO DE LOS CIRCUITOS PARA CONTROLAR LAS CORRIENTES DE HAZ CONDUCIDAS EN TUBOS DE RAYOS CATODICOS EN RECEPTORES DE TELEVISION, CON USO IMPORTANTE PARA IMPEDIR EL FALSO ENCUADRADO O LA VESICULACION DE LA MASCARA DE SOMBRA USADA EN CONJUNCION CON LOS TUBOS DE RAYOS CATODICOS PARA RECEPTORES DE TELEVISION DE COLOR, DEBIDO AL CALENTAMIENTO DESDE CORRIENTES DE HAZ DE PICO INTENSAS Y LOCALIZADAS. UN CIRCUITO ANTI-VESICULACION COMPRENDE UN PRIMER DETECTOR (Q1,R1,R2,R3) PARA DETECTAR LAS EXCURSIONES DE AMPLITUD DE UNA SEÑAL CON INFORMACION DE LUMINANCIA MAS ALLA DE UN UMBRAL DE NIVEL BLANCO DURANTE CADA BARRIDO HORIZONTAL. ESTO PERMITE AL CURCUITO SER MAS SENSIBLE RESPONDIENDO A EXCURSIONES QUE SE PRODUCEN DURANTE CADA LINEA DE BARRIDO HORIZONTAL. UN PRIMER SINCRONIZADOR (C1,R5), QUE RESPONDE AL PRIMER DETECTOR, PROPORCIONA UNA PRIMERA SEÑAL DE CONTROL RELACIONADA CON UNA DURACION MINIMA DE CADA EXCURSION DE AMPLITUD DE LA SEÑAL MAS ALLA DEL UMBRAL. ESTO PERMITE AL CIRCUITO EVITAR CONTROLAR LA CORRIENTE DE HAZ, POR EJEMPLO MEDIANTE LA REDUCCION DEL CONTRASTE, QUE RESPONDE A CORRIENTES DE PICO DE SEÑAL QUE SON DEMASIADO CORTAS PARA PRODUCIR VESICULACION O FALSO ENCUADRE. FINALMENTE, UN CONMUTADOR (Q2) Y UN SEGUNDO SINCRONIZADOR (C2,R6), QUE RESPONDEN A LA PRIMERA SEÑAL DE CONTROL, PROPORCIONAN UNA SEGUNDA SEÑAL DE CONTROL QUE CAE EN UN PRIMER INDICE PARA REDUCIR LA CORRIENTE DE HAZ, POR EJEMPLO MEDIANTE LA REDUCCION DE CONTRASTE, DURANTE CADA EXCURSION DE AMPLITUD DE DURACION MINIMA; Y LA CUAL SE ELEVA A UN SEGUNDO INDICE PARA PERMITIR A LA CORRIENTE DE HAZ QUE SE INCREMENTE DESPUES DE LA TERMINACION DE LA EXCURSION DE AMPLITUD, HASTA LA SIGUIENTE EXCURSION DE DURACION MINIMA. LA CONSTANTE DE TIEMPO PARA EL SEGUNDO INDICE ES MUCHO MAYOR QUE LA CONSTANTE DE TIEMPO DEL PRIMER INDICE.
ES90304128T 1989-04-20 1990-04-18 Circuito de control de un haz de tubo de rayos catodicos. Expired - Lifetime ES2076309T3 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US34065289A 1989-04-20 1989-04-20

Publications (1)

Publication Number Publication Date
ES2076309T3 true ES2076309T3 (es) 1995-11-01

Family

ID=23334368

Family Applications (1)

Application Number Title Priority Date Filing Date
ES90304128T Expired - Lifetime ES2076309T3 (es) 1989-04-20 1990-04-18 Circuito de control de un haz de tubo de rayos catodicos.

Country Status (9)

Country Link
EP (1) EP0394003B1 (es)
JP (1) JP3049506B2 (es)
KR (1) KR100188238B1 (es)
AT (1) ATE126957T1 (es)
CA (1) CA2013928C (es)
DE (1) DE69021764T2 (es)
ES (1) ES2076309T3 (es)
FI (1) FI97667C (es)
MY (1) MY105525A (es)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19818387A1 (de) * 1997-10-20 1999-04-22 Thomson Brandt Gmbh Verfahren zum Regeln der Bildleistung bei einem Fernsehempfänger

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5230821Y2 (es) * 1973-02-28 1977-07-14
US4689668A (en) * 1986-07-14 1987-08-25 Rca Corporation Auxiliary kinescope beam current limiter with plural cascaded low pass filter and peak detector stages

Also Published As

Publication number Publication date
EP0394003A2 (en) 1990-10-24
CA2013928C (en) 2002-06-18
DE69021764D1 (de) 1995-09-28
FI97667C (fi) 1997-01-27
FI97667B (fi) 1996-10-15
EP0394003B1 (en) 1995-08-23
JP3049506B2 (ja) 2000-06-05
CA2013928A1 (en) 1990-10-20
FI901858A0 (fi) 1990-04-12
EP0394003A3 (en) 1990-12-19
KR900017367A (ko) 1990-11-16
ATE126957T1 (de) 1995-09-15
JPH02295388A (ja) 1990-12-06
KR100188238B1 (ko) 1999-06-01
MY105525A (en) 1994-10-31
DE69021764T2 (de) 1996-04-04

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