KR101237702B1 - 평판표시장치의 무신호 처리회로 - Google Patents

평판표시장치의 무신호 처리회로 Download PDF

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Publication number
KR101237702B1
KR101237702B1 KR1020100115641A KR20100115641A KR101237702B1 KR 101237702 B1 KR101237702 B1 KR 101237702B1 KR 1020100115641 A KR1020100115641 A KR 1020100115641A KR 20100115641 A KR20100115641 A KR 20100115641A KR 101237702 B1 KR101237702 B1 KR 101237702B1
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South Korea
Prior art keywords
signal
driving
driving chips
input
oscillator
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KR1020100115641A
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English (en)
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KR20120054320A (ko
Inventor
김병민
김영기
나준호
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주식회사 실리콘웍스
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Priority to KR1020100115641A priority Critical patent/KR101237702B1/ko
Priority to US13/298,952 priority patent/US9035925B2/en
Publication of KR20120054320A publication Critical patent/KR20120054320A/ko
Application granted granted Critical
Publication of KR101237702B1 publication Critical patent/KR101237702B1/ko

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    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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    • G09G2300/0421—Structural details of the set of electrodes
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    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G09G3/3655—Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3674—Details of drivers for scan electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3685—Details of drivers for data electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3696—Generation of voltages supplied to electrode drivers

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  • Engineering & Computer Science (AREA)
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  • Computer Hardware Design (AREA)
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  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

본 발명은 평판표시장치에서 제어부가 각각의 구동소자에 병합된 형태의 구동칩을 사용하는 경우, 임의의 구동칩에서 무신호 상태를 검출할 때 모든 구동칩들이 동시에 무신호 모드로 전환되도록 하는 기술에 관한 것이다.
이를 위해, 평판표시장치의 구동회로에 외부로부터 LVDS가 입력되지 않는 무신호 상태가 검출될 때 자신 및 다른 구동칩의 무신호검출패드의 전위를 동시에 천이시켜 모든 구동칩이 무신호 모드로 동작되도록 하는 복수의 구동칩을 구비한다.

Description

평판표시장치의 무신호 처리회로{CIRCUIT FOR CONTROLLING NON-SIGNAL OF PLAT PANEL DISPLAY DEVICE}
본 발명은 평판표시장치에서 무신호에 대한 처리기술에 관한 것으로, 특히 제어부가 각각의 구동소자에 병합된 형태의 구동칩을 사용하는 경우 하나의 구동칩에서 무신호 상태를 검출할 때 다른 모든 구동칩들이 동시에 페일 세이프 모드로 전환하는데 적당하도록 한 평판표시장치의 무신호 처리회로에 관한 것이다.
근래 들어, 액정표시장치(LCD), 피디피(PDP), 유기발광다이오드(OLED) 패널 등과 같은 평판 디스플레이 장치가 널리 보급되어 사용되고 있으며, 그 중에서 액정표시장치의 보급율이 더욱 두드러지게 나타나고 있다.
도 1은 종래 평판표시장치의 한 예로써 액정표시장치에 대한 블록도로서 이에 도시한 바와 같이, 다수의 데이터라인과 다수의 게이트라인의 교차부에 매트릭스 형태로 배치되는 다수의 액정화소를 구비한 액정패널(110); 상기 액정패널(110)을 구동하기 위해 화상 데이터를 처리하고 각종 제어신호를 생성하는 타이밍 콘트롤러(120); 상기 타이밍 콘트롤러(120)의 제어를 받아 상기 액정패널(110)의 데이터라인에 데이터전압을 공급하는 다수의 소스드라이버 집적소자(130A-130C); 상기 타이밍 콘트롤러(120)의 제어를 받아 상기 액정패널(110)의 게이트라인에 스캔신호를 공급하는 게이트 드라이버 집적소자(140)를 구비한다.
액정패널(110)은 다수의 데이터라인과 다수의 게이트라인의 교차부에 매트릭스 형태로 배치되는 다수의 화소를 구비한다. 상기 화소에 각기 형성된 트랜지스터는 해당 게이트라인으로부터 공급되는 스캔신호에 응답하여 데이터라인으로부터 입력되는 데이터전압을 액정셀로 전달한다. 또한, 상기 액정셀 각각에는 스토리지 커패시터가 형성되는데, 이는 그 액정셀의 전압을 일정하게 유지시키는 역할을 수행한다. 이에 따라, 액정패널상에 화상이 디스플레이된다.
타이밍 콘트롤러(120)는 상기 액정패널(110)과 분리된 메인 보드상에 설치되어 시스템으로부터 공급되는 수직/수평동기신호와 클럭신호를 이용하여 게이트 드라이버(140)를 제어하기 위한 게이트제어신호와 소스 드라이버 집적소자(130A-130C)를 제어하기 위한 데이터 제어신호를 발생한다. 또한, 상기 타이밍 콘트롤러(120)는 상기 시스템으로부터 입력되는 디지털 비디오 데이터(RGB)인 LVDS(Low-Voltage Differential Signaling)를 재정렬하여 상기 소스 드라이버 집적소자(130A-130C)에 공급한다.
소스 드라이버 집적소자(130A-130C)는 일반적으로 상기 액정패널(110)의 일측 가장자리에 부착되는데, 이들은 상기 타이밍 콘트롤러(120)로부터 공급되는 데이터제어신호에 응답하여 상기 디지털 비디오 데이터(RGB)를 계조값에 대응하는 데이터전압으로 변환하여 상기 액정패널(110)의 데이터라인에 공급한다.
게이트 드라이버 집적소자(140)는 일반적으로 상기 액정패널(110)의 타측 가장자리에 부착되는데, 이는 상기 타이밍 콘트롤러(120)로부터 공급되는 게이트 제어신호에 응답하여 스캔신호를 게이트라인에 순차적으로 공급하여 데이터가 공급되는 상기 액정패널(110)의 수평라인들이 선택적으로 구동된다.
상기와 같이 하나의 타이밍 콘트롤러(120)가 외부로부터 LVDS를 입력받아 다수의 소스드라이버 집적소자(130A-130C)에 전달하는 방식의 시스템에서는 그 타이밍 콘트롤러(120)가 LVDS가 입력되지 않는 무신호 상태를 체크하여 동시에 그 소스 드라이버 집적소자(130A-130C)에 현재 무신호 상태임을 알린다. 따라서, 상기 다수의 소스 드라이버 집적소자(130A-130C)는 동시에 무신호 모드로 동작할 수 있게 된다.
그런데, 최근 들어 액정표시장치에 대한 대형화 및 슬림화 요구에 부응하기 위하여, 타이밍 콘트롤러가 각각의 소스 드라이버 집적소자(Source Driver IC)에 각기 병합(merge)된 반도체칩이 개발되었다.
상기와 같은 타이밍 콘트롤러가 병합된 소스드라이버 집적소자(이하, '구동칩'이라 칭함)를 사용하는 경우, 각각의 구동칩은 내부의 발진기를 이용하여 화상 데이터 및 게이트라인 제어신호를 생성하는데, 이들에 의해 발생되는 주파수는 조금씩 차이가 있다.
따라서, 각각의 구동칩들이 동시에 무신호 상태에 놓이게 되는 경우, 무신호 상태를 감지하는 시점은 상기 주파수 차이만큼의 차이가 발생되는데, 도 2는 그 예를 나타낸 파형도이다.
예를 들어, 제1-3구동칩을 사용하고, 제1구동칩에서 사용하는 발진기의 주파수가 제일 빠르고, 제2구동칩에서 사용하는 발진기의 주파수가 그 다음으로 빠르며, 제3구동칩에서 사용하는 발진기의 주파수가 제일 느린 경우, 도 2의 (a)-(c)에서와 같이 제1구동칩이 제일 먼저 무신호 상태를 검출하고, 제2구동칩에서 그 다음에 무신호 상태를 검출하며, 제3구동칩이 마지막으로 무신호 상태를 검출하게 된다. 도 2의 (d)는 제1-3구동칩이 무신호 상태에 놓이게 되는 시점을 나타낸 것이다.
이와 같이 TMIC 형태의 구동칩을 사용하는 종래의 평판표시 장치에 있어서는 내부 발진기의 주파수 차이만큼 무신호 상태를 검출하는 시점이 차이가 나므로 모든 구동칩들이 동시에 무신호 모드(Fail Safe Mode)로 동작하지 못하게 되고, 이로 인하여 시스템이 해당 시점에서 불안정하게 되는 문제점이 있다.
따라서, 본 발명의 목적은 평판표시장치에서 제어부가 각각의 구동소자에 병합된 형태의 구동칩을 사용하는 경우, 임의의 구동칩에서 무신호 상태를 검출할 때 모든 구동칩들이 동시에 무신호 모드로 전환되도록 하는데 있다.
본 발명의 목적들은 앞에서 언급한 목적으로 제한되지 않는다. 본 발명의 다른 목적 및 장점들은 아래 설명에 의해 더욱 분명하게 이해될 것이다.
상기와 같은 목적을 달성하기 위한 본 발명은,
타이밍 콘트롤러와 소스드라이버를 포함하며, 외부로부터 정상신호가 입력되지 않는 무신호 상태가 검출될 때 자신 및 다른 구동칩을 동시에 무신호 모드로 동작되도록 하는 복수의 구동칩;
상기 복수의 구동칩으로부터 입력되는 데이터의 계조값에 대응되는 데이터전압에 의해 구동되어 화상을 표시하는 디스플레이 패널을 구비한다.
본 발명은 평판표시장치에서 제어부가 각각의 구동소자에 병합된 형태의 구동칩을 사용하는 경우, 임의의 구동칩에서 무신호 상태를 검출할 때 모든 구동칩들이 동시에 무신호 모드로 전환되도록 함으로써, 무신호 모드 전환시 시스템이 불안정한 상태로 되는 것을 방지할 수 있는 효과가 있다.
도 1은 종래 액정표시장치의 블록도이다.
도 2의 (a)-(d)는 복수의 구동칩에서 무신호 상태를 검출하는 예를 나타낸 파형도이다.
도 3은 본 발명에 의한 평판표시장치의 무신호 처리회로의 블록도이다.
도 4는 도 3에서 구동칩에 대한 상세 블록도이다.
이하, 첨부한 도면을 참조하여 본 발명의 바람직한 실시예를 상세히 설명하면 다음과 같다.
도 3은 본 발명에 의한 평판표시장치의 무신호 처리회로의 블록도로서 이에 도시한 바와 같이, 제1-3구동칩(310A-310C) 및 디스플레이 패널(320)을 구비한다.
제1-3구동칩(310A-310C)은 제어부가 구동소자에 각기 병합된 형태의 반도체칩(TMIC)이다. 예를 들어, 평판표시장치가 액정표시장치인 경우 상기 제어부는 타이밍 콘트롤러에 해당되고 구동소자는 소스 드라이버에 해당된다. 이와 같은 경우, 상기 제1-3구동칩(310A-310C)은 외부로부터 입력되는 디지털 비디오 데이터(RGB)를 정렬한 후 계조값에 대응하는 데이터전압으로 변환하여 디스플레이 패널(320)의 데이터라인에 공급한다. 상기 비디오 데이터는 LVDS(Low-Voltage Differential Signaling) 방식으로 전송될 수 있다.
디스플레이 패널(320)은 액정표시장치(LCD), 피디피(PDP), 유기발광다이오드(OLED)의 패널을 모두 포함한다. 예를 들어, 상기 디스플레이 패널(320)이 액정패널인 경우 다수의 데이터라인과 다수의 게이트라인의 교차부에 매트릭스 형태로 배치되는 다수의 화소를 구비한다. 상기 화소에 각기 형성된 트랜지스터는 해당 게이트라인으로부터 공급되는 스캔신호에 응답하여 상기 데이터라인으로부터 입력되는 데이터전압을 액정셀로 전달하여 액정패널상에 화상이 디스플레이된다.
상기 제1-3구동칩(310A-310C)은 각각 별도의 내부 발진기를 사용하는데, 이들의 발진주파수는 제조공정상의 조건이나 주변의 환경변화에 의해 조금씩 차이가 난다. 따라서, 상기 제1-3구동칩(310A-310C)이 동시에 LVDS가 입력되지 않는 무신호 상태에 놓이게 되더라도 내부 발진기의 주파수 차이만큼 무신호 상태를 검출하는 시점이 차이가 난다. 여기서, 무신호 상태는 전원은 인가되었으나 신호(수직동기신호, 수평동기신호, 데이터 인에이블신호 또는 클럭신호 등)가 입력되지 않는 상태를 포함한다.
하지만, 상기 제1-3구동칩(310A-310C) 중 임의의 구동칩에서 제일 먼저 LVDS가 입력되지 않는 무신호 상태를 검출할 때 모든 구동칩(310A-310C)이 동시에 무신호 모드(Fail Safe Mode)로 동작되게 함으로써 발진주파수 차이로 인한 부작용이 발생되지 않는데, 이에 대하여 도 4를 참조하여 상세히 설명하면 다음과 같다.
도 4는 상기 도 3에서 제1-3구동칩(310A-310C)의 구현예를 나타낸 상세 블록도로서 이에 도시한 바와 같이, 제1구동칩(310A)이 발진기(311A), 무신호 검출기(312A) 및 트랜지스터(M1)를 구비하고, 제2구동칩(310B) 또한 상기 제1구동칩(310A)과 동일한 구조의 발진기(311B), 무신호 검출기(312B) 및 트랜지스터(M2)를 구비하며, 제3구동칩(310C) 또한 상기 제1구동칩(310A)과 동일한 구조의 발진기(311C), 무신호 검출기(312C) 및 트랜지스터(M3)를 구비한다.
제1-3구동칩(310A-310C)에서, 각각의 무신호 검출기(312A-312C)는 내부에 구비된 전용의 발진기(311A-311C)에서 출력되는 클럭신호를 이용하여 LVDS가 입력되지 않는 무신호 상태를 체크하여 그에 따른 검출신호(INT_DET)를 출력한다.
예를 들어 제1구동칩(310A)의 무신호 상태 검출동작을 살펴보면, 무신호 검출기(312A)는 발진기(311A)에서 출력되는 클럭신호를 이용하여 정상신호(LVDS)가 입력되지 않는 무신호 상태인지 체크하여 무신호 상태가 아닌 경우 검출신호(INT_DET)를 '로우'로 출력한다. 이에 따라, 트랜지스터(M1)가 오프상태로 유지된다. 따라서, 무신호검출패드(DET1)는 '하이'로 유지된다.
그러나, 상기 무신호 검출기(312A)가 상기와 같이 정상신호(LVDS)가 입력되지 않는 무신호 상태인지 체크하여 무신호 상태인 경우에는 검출신호(INT_DET)를 '하이'로 출력한다. 이에 따라, 상기 트랜지스터(M1)가 턴온된다. 따라서, 저항(R1)을 통해 무신호검출패드(DET)에 공급되는 전원단자(VCC)의 전압이 상기 트랜지스터(M1)를 통해 접지단자로 뮤팅되므로 그 무신호검출패드(DET1)가 '로우' 상태로 전환된다.
상기 제1,2구동칩(310B),(310C)에서도 상기 제1구동칩(310A)과 같이 무신호 상태를 체크하여 무신호 상태일 때 무신호검출패드(DET2),(DET3)를 '로우' 상태로 전환시킨다.
그런데, 상기 설명에서와 같이 상기 제1-3구동칩(310A-310C)에 사용되는 각각의 발진기(311A-311C)에서 출력되는 클럭신호의 주파수가 조금씩 차이가 나므로 이들이 동시에 무신호 상태에 놓이게 되는 경우, 무신호 상태를 감지하는 시점은 상기 주파수 차이만큼의 차이가 발생되는데, 도 2는 그 예를 나타낸 파형도이다.
예를 들어, 제1구동칩(310A)에서 사용하는 발진기(311A)의 주파수가 제일 빠르고, 제2구동칩(310B)에서 사용하는 발진기(311B)의 주파수가 그 다음으로 빠르며, 제3구동칩(310C)에서 사용하는 발진기(311C)의 주파수가 제일 느린 경우, 도 2의 (a)-(c)에서와 같이 제1구동칩(310A)이 제일 먼저 무신호 상태를 검출하고, 제2구동칩(310B)에서 그 다음에 무신호 상태를 검출하며, 제3구동칩(310C)이 마지막으로 무신호 상태를 검출하게 된다.
하지만, 상기 설명에서와 같이 제1-3구동칩(310A-310C) 중에서 임의의 어느 하나에서 무신호 상태를 검출할 때 이에 의해 무신호검출패드(DET1-DET3) 중에서 해당 무신호검출패드가 '로우' 상태로 전환된다. 그런데, 도 4에서와 같이 상기 무신호검출패드(DET1-DET3)들은 검출배선으로 공통 접속되어 그 접속점이 상기 저항(R1)을 통해 전원단자(VCC)에 연결되어 있다.
따라서, 상기 제1-3구동칩(310A-310C) 중에서 임의의 어느 하나에서 무신호 상태를 검출할 때 이들의 무신호검출패드(DET1-DET3)가 동시에 '로우' 상태로 전환된다. 이에 따라, 상기 임의의 어느 하나에서 무신호 상태를 검출하는 시점에서 상기 제1-3구동칩(310A-310C)이 동시에 무신호 모드(Fail Safe Mode)로 동작하게 된다.
상기 무신호검출패드(DET1-DET3)의 '로우' 레벨은 제1-3구동칩(310A-310C)들의 수평동기신호, 수직동기신호, 데이터인에이블신호 등을 동기화시키는데 사용될 수 있다.
도 2의 (d)는 제1-3구동칩(310A-310C)이 무신호 상태에 놓이게 되는 시점을 나타낸 것으로, 이 시점에서 상기 제1-3구동칩(310A-310C) 모두가 동시에 무신호 모드로 동작하게 된다.
이상에서 본 발명의 바람직한 실시예에 대하여 상세히 설명하였지만, 본 발명의 권리범위가 이에 한정되는 것이 아니라 다음의 청구범위에서 정의하는 본 발명의 기본 개념을 바탕으로 보다 다양한 실시예로 구현될 수 있으며, 이러한 실시예들 또한 본 발명의 권리범위에 속하는 것이다.
310A-310C : 제1-3구동칩
311A-311C : 발진기
312A-312C : 무신호 검출기
320 : 디스플레이 패널

Claims (6)

  1. 타이밍 콘트롤러와 소스드라이버를 포함하며, 외부로부터 정상신호가 입력되지 않는 무신호 상태가 검출될 때 자신 및 다른 구동칩을 동시에 무신호 모드로 동작되도록 하는 복수의 구동칩; 및
    상기 복수의 구동칩으로부터 입력되는 데이터의 계조값에 대응되는 데이터전압에 의해 구동되어 화상을 표시하는 디스플레이 패널;을 포함하되,
    상기 복수의 구동칩은 외부로부터 정상신호가 입력되지 않는 무신호 상태가 검출될 때 자신 및 다른 구동칩의 무신호검출패드의 전위를 동시에 천이시켜 모든 구동칩이 무신호 모드로 동작되도록 하는 것을 특징으로 하는 평판표시장치의 무신호 처리회로.
  2. 삭제
  3. 제1항에 있어서, 자신 및 다른 구동칩의 무신호검출패드는 서로 공통으로 접속되고 그 공통 접속점이 전원단자에 접속된 것을 특징으로 하는 평판표시장치의 무신호 처리회로.
  4. 제1항에 있어서, 복수의 구동칩은
    클럭신호를 발생하는 발진기;
    상기 발진기에서 출력되는 클럭신호를 이용하여 정상신호가 입력되지 않는 무신호 상태를 검출하여 그에 따른 로직의 신호를 출력하는 무신호 검출기;
    상기 무신호 검출기가 무신호 상태 검출시 출력하는 신호에 의해 턴온되어 자신의 무신호검출패드 및 다른 구동칩의 무신호검출패드의 전위를 동시에 천이시키는 트랜지스터를 포함하여 구성된 것을 특징으로 하는 평판표시장치의 무신호 처리회로.
  5. 제1항에 있어서, 복수의 구동칩은 다른 구동칩의 발진기에서 출력되는 주파수보다 높은 주파수의 클럭신호를 발생하는 발진기를 사용하는 구동칩이 상기 무신호 상태를 먼저 검출하는 것을 특징으로 하는 평판표시장치의 무신호 처리회로.
  6. 타이밍컨트롤러와 소스드라이버가 병합된 제1구동칩 및 제2구동칩을 포함하며, 상기 제1구동칩은 제1클럭을 생성하는 제1발진기, 상기 제1클럭을 이용하여 정상신호 입력여부를 감시하며 정상신호가 입력되지 않으면 제1제어신호를 인에이블시키는 제1신호검출기, 일단이 접지단자에 연결되고 타단이 제1검출패드에 연결되며 상기 제1제어신호에 응답하여 상기 제1검출패드를 상기 접지단자에 연결시키는 제1트랜지스터를 포함하고,
    상기 제2구동칩은 제2클럭을 생성하는 제2발진기, 상기 제2클럭을 이용하여 정상신호 입력여부를 감시하며 정상신호가 입력되지 않으면 제2제어신호를 인에이블시키는 제2신호검출기, 일단이 접지단자에 연결되고 타단이 제2검출패드에 연결되며 상기 제2제어신호에 응답하여 상기 제2검출패드를 상기 접지단자에 연결시키는 제2트랜지스터를 포함하고,
    상기 제1검출패드와 제2검출패드는 검출배선으로 연결된 것을 특징으로 하는 평판표시장치의 무신호 처리회로.
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