KR890011423A - LCD Projector Auto Focus System - Google Patents

LCD Projector Auto Focus System Download PDF

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Publication number
KR890011423A
KR890011423A KR1019870015524A KR870015524A KR890011423A KR 890011423 A KR890011423 A KR 890011423A KR 1019870015524 A KR1019870015524 A KR 1019870015524A KR 870015524 A KR870015524 A KR 870015524A KR 890011423 A KR890011423 A KR 890011423A
Authority
KR
South Korea
Prior art keywords
lcd
automatic
data
half mirror
lcd projector
Prior art date
Application number
KR1019870015524A
Other languages
Korean (ko)
Other versions
KR910005250B1 (en
Inventor
박홍철
Original Assignee
최근선
주식회사 금성사
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 최근선, 주식회사 금성사 filed Critical 최근선
Priority to KR1019870015524A priority Critical patent/KR910005250B1/en
Publication of KR890011423A publication Critical patent/KR890011423A/en
Application granted granted Critical
Publication of KR910005250B1 publication Critical patent/KR910005250B1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/72—Modifying the appearance of television pictures by optical filters or diffusing screens
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Automatic Focus Adjustment (AREA)
  • Projection Apparatus (AREA)

Abstract

내용 없음No content

Description

LCD프로젝터의 포커스 자동조정 시스템LCD Projector Auto Focus System

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 본 발명에 따른 LCD프로젝터의 포커스 자동조정 시스템 구성도.1 is a configuration diagram of the automatic focus control system of the LCD projector according to the present invention.

제3도는 본 발명에 따른 콘트롤 회로의 상세도.3 is a detailed view of a control circuit according to the present invention.

Claims (4)

LCD프로젝터의 프로젝션렌즈를 전, 후로 이동하여 핀트를 자동적으로 조절하는 자동포커스 시스템에 있어서, 자동 포커스 조절시에 하프미러(3)를 프로젝션렌즈(2)와 LCD(4)사이에 설치하고, LCD(4)와 하프미러(3)사이의 거리와 같은 광측에 수직인 자리에 이메지스캔너를 설치하여 프로젝션렌즈(2)와 하프미러(3)를 통해 이메지스캔너 위에 맺힌 이메지의 콘트라스트를 최대로 맞춰지도록 조절하므로써 자동포커스를 시행할 수 있도록 한 것을 특징으로 하는 LCD프로젝터의 포커스 자동조정 시스템.In an autofocus system for automatically adjusting the focus by moving the projection lens of the LCD projector forward and backward, a half mirror (3) is installed between the projection lens (2) and the LCD (4) during automatic focus adjustment. An image scanner is installed at a position perpendicular to the light side, such as the distance between (4) and the half mirror (3), to maximize the contrast of the image formed on the image scanner through the projection lens (2) and the half mirror (3). Automatic focusing system for LCD projectors, characterized in that the automatic focusing can be carried out by adjusting it. 제1항에 있어서, 자동 포커스 조절시 스위치(28)를 누를 때 임의의 한 방향으로 렌즈를 이동시키도록 구성한 것을 특징으로 하는 LCD프로젝터의 포커스 자동조정 시스템.2. The system of claim 1, wherein the lens is configured to move the lens in any one direction when the switch (28) is pressed during the automatic focus adjustment. 제1항에 있어서, 검출된 콘트라스트를 디지탈데이타로 변환한 후 수직동기신호에 의해 구동되는 레지스터에 두 프레임의 데이타를 세이브하고, 이 두 데이타를 비교하므로써 모터(14)의 구동방향을 조절하도록 한 것을 특징으로 하는 LCD프로젝터의 포커스 자동조정 시스템.The method according to claim 1, wherein after converting the detected contrast into digital data, two frames of data are stored in a register driven by a vertical synchronization signal, and the driving directions of the motor 14 are adjusted by comparing the two data. Focus automatic adjustment system of the LCD projector, characterized in that. 제1, 제3항에 있어서, 두 프레임의 콘트라스트 데이타 차이가 어떤 기준치보다 작을 경우에는 모터(14)의 구동을 정지시키도록 한 것을 특징으로 하는 LCD프로젝터의 포커스 자동조정 시스템.4. The system according to claim 1 or 3, wherein the driving of the motor (14) is stopped when the contrast data difference between the two frames is smaller than a reference value. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019870015524A 1987-12-31 1987-12-31 Focus control system of lcd projector KR910005250B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019870015524A KR910005250B1 (en) 1987-12-31 1987-12-31 Focus control system of lcd projector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019870015524A KR910005250B1 (en) 1987-12-31 1987-12-31 Focus control system of lcd projector

Publications (2)

Publication Number Publication Date
KR890011423A true KR890011423A (en) 1989-08-14
KR910005250B1 KR910005250B1 (en) 1991-07-24

Family

ID=19267802

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019870015524A KR910005250B1 (en) 1987-12-31 1987-12-31 Focus control system of lcd projector

Country Status (1)

Country Link
KR (1) KR910005250B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100934654B1 (en) * 2003-04-17 2009-12-31 엘지전자 주식회사 Projection TV's Auto Focusing Device and Method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100934654B1 (en) * 2003-04-17 2009-12-31 엘지전자 주식회사 Projection TV's Auto Focusing Device and Method

Also Published As

Publication number Publication date
KR910005250B1 (en) 1991-07-24

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