KR0183157B1 - Circuit for protecting crt in television - Google Patents
Circuit for protecting crt in television Download PDFInfo
- Publication number
- KR0183157B1 KR0183157B1 KR1019950067783A KR19950067783A KR0183157B1 KR 0183157 B1 KR0183157 B1 KR 0183157B1 KR 1019950067783 A KR1019950067783 A KR 1019950067783A KR 19950067783 A KR19950067783 A KR 19950067783A KR 0183157 B1 KR0183157 B1 KR 0183157B1
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- KR
- South Korea
- Prior art keywords
- crt
- digital signal
- signal processor
- microcomputer
- processed
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
- H04N3/20—Prevention of damage to cathode-ray tubes in the event of failure of scanning
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/004—Diagnosis, testing or measuring for television systems or their details for digital television systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- General Health & Medical Sciences (AREA)
- Theoretical Computer Science (AREA)
- Processing Of Color Television Signals (AREA)
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
Abstract
CRT에 화상자국이 생기는 것을 방지하기위해 정지화면상태가 계속되는 것을 감지하여 이에 의해 CRT의 빔전류를 줄여 CRT의 수명을 연장시키기 의해It detects that the still image state continues to prevent image marks on the CRT, thereby reducing the beam current of the CRT and extending the life of the CRT.
수신되는 디지탈 신호를 디지탈 신호 처리부(10)에서 받아 처리하고, 상기 디지탈 신호 처리부(10)에서 처리된 신호는 마이콤(50)의 제어에 의해 크로마 신호 처리부(40)에서 처리하여 CRT를 구동키 위한 CRT구동부(60)를 구비한 시스템에 있어서, 상기 디지탈 신호처리부(10)에서 출력되는 제1,2필드 화상신호로 부터 정지화상을 판별하는 정지화상 판별부(20)와, 상기 정지화상 판별부(20)에서 판별된 정지화상이 장시간인지 단시간인지를 검출하여 검출결과를 상기 마이콤(50)에 제공하는 적분기(30)로 구성된다.The digital signal processor 10 receives and processes the received digital signal, and the signal processed by the digital signal processor 10 is processed by the chroma signal processor 40 under the control of the microcomputer 50 to drive the CRT. In the system provided with the CRT driving section 60, a still picture discriminating section 20 for discriminating a still picture from the first and second field image signals output from the digital signal processing section 10, and the still picture discriminating section. And an integrator 30 which detects whether or not the still image determined in step 20 is a long time or a short time and provides a detection result to the microcomputer 50.
Description
제1도는 본 발명의 실시예에 따른 블럭도.1 is a block diagram according to an embodiment of the present invention.
제2도는 제1도의 구체 회로도.2 is a concrete circuit diagram of FIG.
본 발명은 디지탈 신호처리를 하는 텔레비젼 수상기 또는 표시장치에서 CRT의 수명을 연장하는 장치에 관한 것으로, 특히 과도한 빔전류가 정지화상상태에서 계속 흐를시 발생되는 자국을 방지하기 위해 정지화상의 상태를 판별하여 정지화상이 일정시간 계속 진행되면 CRT의 빔전류를 줄여주어 CRT의 형광체 보호로 CRT의 수명을 연장시키는 텔레비젼 수상기의 CRT 수명 연장회로에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for extending the life of a CRT in a television receiver or display device that performs digital signal processing. In particular, the present invention relates to a device for determining the state of a still picture in order to prevent a mark generated when excessive beam current continues to flow in the still picture state. The present invention relates to a CRT life extension circuit of a television receiver which reduces the beam current of the CRT when the still image continues for a predetermined time, thereby extending the life of the CRT by protecting the phosphor of the CRT.
종래의 디지털신호처리 텔레비젼수상기에서 정지 화상을 수시간 동안 강한 빔(beam) 전류로 표시를 하게 되면 CRT에 정지화상에 대한 자국이 남게 되어 CRT수명을 단축시키게 되는 문제점이 있다.When displaying a still image with a strong beam current for several hours in a conventional digital signal processing television receiver, there is a problem that marks on the still image remain in the CRT, thereby shortening the life of the CRT.
따라서 본 발명의 목적은 CRT에 화상자국이 생기는 것을 방지하기 위해 정지화면상태가 계속되는 것을 감지하여 이에 의해 CRT의 빔전류를 줄여 CRT의 수명을 연장시키는 장치를 제공함에 있다.Accordingly, an object of the present invention is to provide a device that detects that the still picture state is continued in order to prevent image marks on the CRT and thereby extends the life of the CRT by reducing the beam current of the CRT.
이하 본 발명을 첨부된 도면을 참조하여 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
제1도는 본 발명에 따라 블럭도로서, 수신되는 디지탈 신호를 디지탈 신호 처리부(10)에서 받아 처리하고, 상기 디지탈 신호 처리부(10)에서 처리된 신호는 마이콤(50)의 제어에 의해 크로마 신호 처리부(40)에서 치리하여 CRT를 구동키 위한 CRT구동부(60)를 구비한 시스템에 있어서, 상기 디지탈 신호처리부(10)에서 출력되는 제1,2필드 화상신호로 부터 정지화상을 판별하는 정지화상 판별부(20)와, 상기 정지화상 판별부(20)에서 판별된 정지화상이 장시간인지 단시간인지를 검출하여 검출결과를 상기 마이콤(50)에 제공하는 적분기(30)로 구성된다.1 is a block diagram according to the present invention, in which the received digital signal is received and processed by the digital signal processor 10, and the signal processed by the digital signal processor 10 is subjected to the chroma signal processor by the control of the microcomputer 50. In a system having a CRT driver 60 for driving a CRT at 40, a still picture discrimination for discriminating a still picture from the first and second field image signals output from the digital signal processor 10 is performed. And an integrator 30 which detects whether the still image determined by the still image discriminating unit 20 is a long time or a short time and provides a detection result to the microcomputer 50.
제2도는 제1도의 정지화상 판별부(20)와, 적분기(30)의 실시예를 구체적으로 도시한 것으로, 상기 정지화상 판별부(20)는 상기 디지탈 신호처리부(10)로 부터 필드 단위로 순서대로 저장하기 위한 제1,2필드메모리(21,22)와, 상기 제1,2필드메모리(21.22)의 출력을 비교하여 정지화상인지 여부를 판단하는 비교기(23)로 구성된다.FIG. 2 is a diagram illustrating an embodiment of the still image discriminating unit 20 and the integrator 30 of FIG. 1, and the still image discriminating unit 20 is a field unit from the digital signal processing unit 10. And first and second field memories 21 and 22 for storing in order, and a comparator 23 for comparing the outputs of the first and second field memories 21 and 22 to determine whether the image is a still picture.
상기 적분기(30)는 상기 비교기(23)의 출력을 저항(R1-R3)과 캐패시터(C1)를 통해 적분하여 트랜지스터(Q1)를 구동하여 상기 마이콤(50)에 제공되어 상기 검출된 정지화상 정보에 대해 시간 지속여부를 검출하도록 구성되어 있다.The integrator 30 integrates the output of the comparator 23 through the resistors R1-R3 and the capacitor C1 to drive the transistor Q1 and is provided to the microcomputer 50 to detect the detected still image information. It is configured to detect whether the time duration for.
따라서 본 발명의 구체적 일실시예를 제1도-제2도를 참조하여 상세히 설명하면,Therefore, a specific embodiment of the present invention will be described in detail with reference to FIGS. 1 to 2.
제2도의 디지탈 신호처리부(10)에서 A/D변환된 디지탈 신호를 제2도의 제1,2필드메모리(21)과 (22)에 입력시킨다. 그리고 비교기(23)에서는 필드 데이타를 비교기(23)에서 서로 비교하여 제1,2필드메모리(21,22)의 내용이 동일 한지를 판별한다. 상기 동일한 경우와 동일하지 않은 경우의 정보데이타는 서로 상반되게 출력단(24)를 통해 적분기(30)로 전송시킨다. 단, 제2도의 제1,2필드메모리(21,22)에는 같은 필드의 동일한 데이타가 입력되지 않게 해야 한다. 제2도의 적분기(30)에서는 정지화상 판별부(20)의 출력단(24)을 통하여 입력된 신호로 부터 저항(R1)과 캐패시터(C1)를 통해 적분하여 트랜지스터(Q1)의 구동으로 정지화상에 대한 인식정보가 짧은 시간동안의 정지화상정보인지 장시간에 대한 정지 화상정보인지를 판별하여 짧은 시간동안의 정지화상인 경우에는 마이콤(50)으로 정지화상 정보를 전달하지 않고, 장시간인 경우에만 정지화상 정보를 마이콤(50)으로 입력시킨다. 상기 제2도의 마이콤(50)에서는 트랜지스터(Q1)의 출력단(31)을 통해 입력된 정지화상 정보를 받아 들이어 정지화상 상태가 일정시간 지속되면 마이콤(50)의 출력단(51)을 통하여 화면의 명암, 밝기등을 점차적으로 낮춰주는 신호를 출력시킨다. 상기 크로마 신호 처리부(40)은 마이콤(50)의 출력단(51)을 통해 입력된 명암, 밝기 등을 낮추어 정지화상 상태가 계속 지속 되더라도 CRT에 자국이 생기는 것이 방지된다.The digital signal processed by the digital signal processor 10 of FIG. 2 is input to the first and second field memories 21 and 22 of FIG. The comparator 23 compares the field data with each other in the comparator 23 to determine whether the contents of the first and second field memories 21 and 22 are the same. The information data in the case of not identical to the same case is transmitted to the integrator 30 through the output terminal 24 in opposition to each other. However, the same data of the same field must not be input to the first and second field memories 21 and 22 of FIG. In the integrator 30 of FIG. 2, the signal is input from the signal input through the output terminal 24 of the still image discriminating unit 20 and integrated through the resistor R1 and the capacitor C1 and driven by the transistor Q1. It is determined whether the recognition information is the still image information for a short time or the still image information for a long time. In the case of a still image for a short time, the still image information is not transmitted to the microcomputer 50. Information is entered into the microcomputer 50. The microcomputer 50 of FIG. 2 receives still image information input through the output terminal 31 of the transistor Q1, and when the still image state lasts for a predetermined time, the screen of the screen is output through the output terminal 51 of the microcomputer 50. Outputs a signal that gradually lowers the contrast and brightness. The chroma signal processor 40 lowers the contrast, brightness, and the like input through the output terminal 51 of the microcomputer 50 to prevent a mark on the CRT even if the still image state continues.
상술한 바와같이 본 발명을 사용하면 정지화상이 장시간 디스플레이 되더라도 CRT에 자국이 생기지 않게 되어 CRT의 수명을 연장시킬 수 있는 이점이 있다.As described above, when the still image is displayed for a long time, there is an advantage that a mark is not generated in the CRT, thereby extending the life of the CRT.
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Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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KR1019950067783A KR0183157B1 (en) | 1995-12-30 | 1995-12-30 | Circuit for protecting crt in television |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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KR1019950067783A KR0183157B1 (en) | 1995-12-30 | 1995-12-30 | Circuit for protecting crt in television |
Publications (2)
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KR970056814A KR970056814A (en) | 1997-07-31 |
KR0183157B1 true KR0183157B1 (en) | 1999-05-01 |
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KR1019950067783A KR0183157B1 (en) | 1995-12-30 | 1995-12-30 | Circuit for protecting crt in television |
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- 1995-12-30 KR KR1019950067783A patent/KR0183157B1/en not_active IP Right Cessation
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