TW248627B - Video system including apparatus for deactivating an automatic control arrangement - Google Patents

Video system including apparatus for deactivating an automatic control arrangement

Info

Publication number
TW248627B
TW248627B TW081103331A TW81103331A TW248627B TW 248627 B TW248627 B TW 248627B TW 081103331 A TW081103331 A TW 081103331A TW 81103331 A TW81103331 A TW 81103331A TW 248627 B TW248627 B TW 248627B
Authority
TW
Taiwan
Prior art keywords
contrast control
white
level
deactivating
threshold level
Prior art date
Application number
TW081103331A
Other languages
Chinese (zh)
Inventor
Adamson Lagoni William
Lawrence O'brien Robert
Original Assignee
Thomson Consumer Electronics
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 filed Critical Thomson Consumer Electronics
Application granted granted Critical
Publication of TW248627B publication Critical patent/TW248627B/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/57—Control of contrast or brightness

Abstract

A projection television system includes an automatic contrast control section for controlling the amplitude of the luminance signal in response to the peak value of a luminance-representative image component signal in order to prevent white-spot blooming. Circuitry is provided for deactivating the automatic contrast control section when a user sets the contrast control level above a given threshold level, e.g., corresponding to the maximum contrast level. As a result white-spot blooming is inhibited in order toensure sharp images for a contrast control range below the given threshold level while allowing maximum white image components to be produced (at the expense of white spot blooming) when the contrast control level is set above the threshold level, depending on the preference of the user.
TW081103331A 1991-08-30 1992-04-28 Video system including apparatus for deactivating an automatic control arrangement TW248627B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US75181091A 1991-08-30 1991-08-30

Publications (1)

Publication Number Publication Date
TW248627B true TW248627B (en) 1995-06-01

Family

ID=25023580

Family Applications (1)

Application Number Title Priority Date Filing Date
TW081103331A TW248627B (en) 1991-08-30 1992-04-28 Video system including apparatus for deactivating an automatic control arrangement

Country Status (7)

Country Link
JP (1) JPH05236385A (en)
KR (2) KR930005462A (en)
CN (1) CN1033129C (en)
MX (1) MX9205002A (en)
MY (1) MY111249A (en)
PL (1) PL169171B1 (en)
TW (1) TW248627B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10246120A1 (en) * 2002-10-01 2004-04-22 Deutsche Thomson-Brandt Gmbh Automatic contrast control with suppression of interference signals

Also Published As

Publication number Publication date
PL295690A1 (en) 1993-03-08
JPH05236385A (en) 1993-09-10
MX9205002A (en) 1993-04-01
PL169171B1 (en) 1996-06-28
CN1070783A (en) 1993-04-07
CN1033129C (en) 1996-10-23
MY111249A (en) 1999-10-30
KR100252723B1 (en) 2000-04-15
KR930005462A (en) 1993-03-23

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