KR100483534B1 - LCD Display Power Supply Sequence Circuit - Google Patents

LCD Display Power Supply Sequence Circuit Download PDF

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KR100483534B1
KR100483534B1 KR1019970076676A KR19970076676A KR100483534B1 KR 100483534 B1 KR100483534 B1 KR 100483534B1 KR 1019970076676 A KR1019970076676 A KR 1019970076676A KR 19970076676 A KR19970076676 A KR 19970076676A KR 100483534 B1 KR100483534 B1 KR 100483534B1
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power supply
transistor
voltage
liquid crystal
crystal display
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KR1019970076676A
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Korean (ko)
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KR19990056667A (en
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고성현
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삼성전자주식회사
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    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/04—Display protection
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

이 발명은 액정표시장치 전원 시퀀스 회로에 관한 것으로, 액정표시장치의 드라이버 집적회로에 전원을 공급하는 회로에 있어서, 아날로그 전원을 입력받아, 디지털 로우전압으로 변환하여 상기 드라이버 집적회로에 출력하는 전압변환기와; 상기 디지털 로우전압이 일정수준에 도달하면, 상기 아날로그 전원을 상기 드라이버 집적회로에 출력하는 스위칭부를 포함하여 구성되어, 액정표시장치의 드라이버 집적회로에 인가되는 전원을 낮은 전압에서 높은 전압의 순서로 인가되도록 하는 액정표시장치 전원 시퀀스 회로에 관한 것이다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply sequence circuit for a liquid crystal display device, the circuit for supplying power to a driver integrated circuit of a liquid crystal display device, comprising: a voltage converter which receives an analog power source, converts it into a digital low voltage, and outputs it to the driver integrated circuit Wow; When the digital low voltage reaches a predetermined level, it comprises a switching unit for outputting the analog power to the driver integrated circuit, the power applied to the driver integrated circuit of the liquid crystal display device in order from low voltage to high voltage The present invention relates to a liquid crystal display power supply sequence circuit.

Description

액정표시장치 전원 시퀀스 회로LCD Display Power Supply Sequence Circuit

본 발명은 액정표시장치(LCD: Liquid Crystal Display) 전원 시퀀스(Sequence) 회로에 관한 것으로, 더욱 상세하게 말하자면, 액정표시장치의 드라이버 집적회로에 인가되는 전원을 낮은 전압에서 높은 전압의 순서로 인가되도록 하는 액정표시장치 전원 시퀀스 회로에 관한 것이다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display (LCD) power supply sequence circuit, and more particularly, to apply power applied to a driver integrated circuit of a liquid crystal display in order of low voltage to high voltage. The present invention relates to a liquid crystal display power supply sequence circuit.

액정표시장치는 경박단소하고 저전압구동과 저전력소모라는 장점을 바탕으로 널리 이용되고 있으며, 그 발전속도도 연 10%이상이며, 차세대 디스플레이로 인식되고 있다.Liquid crystal display devices are widely used based on the advantages of low weight, low voltage driving and low power consumption, and the generation speed is more than 10% per year, and is recognized as next generation display.

또한, 그 응용분야도 다양하며, 노트북 컴퓨터, 휴대폰, 카 네비게이션 시스템(CNS: Car Navigation System), 무선호출기, 캠코더 등 각종 전자기기에 널리 사용되고 있다.In addition, its applications are diverse, and are widely used in various electronic devices such as notebook computers, mobile phones, car navigation systems (CNS), wireless pagers, and camcorders.

최근, 액정표시장치의 개발방향은 오랫동안 단점으로 지적되어 온 좁은 시야각과 화질을 개선하는데 그 초점이 맞추어져 있다. 그리하여 씨알티(CRT: Cathode Ray Tube)에 견줄만한 시야각을 가진 액정표시장치들이 등장하게 되었다.Recently, the development direction of the liquid crystal display device has been focused on improving the narrow viewing angle and image quality, which has been pointed out for a long time. This led to the emergence of liquid crystal displays with a viewing angle comparable to Cathode Ray Tube (CRT).

또한, 액정표시장치 패널의 광온도 범위 구동 특성의 온도 변화에 따른 패널의 휘도, 색좌표, 플리커(Flicker), 크로스토크(Crosstalk), 잔상 등에 대한 관심이 높아지고 있다.In addition, interest in panel brightness, color coordinates, flicker, crosstalk, and afterimages due to temperature changes in driving characteristics of the wide temperature range of LCD panels is increasing.

종래의 티에프티(TFT) 액정표시장치를 이용한 디스플레이 장치들은 주로 노트북 컴퓨터에 응용되어 왔으나, 현재는 모니터 등으로 그 범위가 확대되고 있다.Conventional display devices using TFT liquid crystal display devices have been mainly applied to notebook computers, but the range thereof is now expanded to monitors and the like.

특히, 액정표시장치 모니터는 21세기 정보 디스플레이로서 총애를 받고 있으며, 업체간의 개발경쟁 또한 매우 치열하다.In particular, LCD monitors have been favored as information displays in the 21st century, and the development competition between companies is also very fierce.

이러한 액정표시장치 모니터는 아날로그 전원(Vaa, 주로 하이전압)과 디지털 전원(Vdd, 주로 로우전압)을 필요로 하며, 아날로그 전원 또는 디지털 전원중 하나를 외부에서 입력받거나 둘 다를 입력받는 경우가 있지만 주로 하이전압이 효율상 유리하고, 12V 백라이트(B/L)와의 연계성을 고려하여 아날로그 전압을 이용하는 것이 일반적인 추세이다.The LCD monitor requires an analog power supply (Vaa, mainly high voltage) and a digital power supply (Vdd, mainly low voltage), and may receive either an analog power supply or a digital power supply from an external source, or both. High voltage is advantageous in efficiency, and it is a general trend to use analog voltage in consideration of the connection with 12V backlight (B / L).

이와 같은 전원을 입력받아 액정표시장치 내부에서 필요한 디지털 전압(Vdd, 3V, 5V)을 만들어 사용하고 있다.The power supply is used to create and use the necessary digital voltages (Vdd, 3V, 5V) inside the liquid crystal display.

그러나, 종래의 방식은 아날로그 전원인 하이전압이 인가되고 다음에 디지털 전압인 로우전압이 소스 드라이버에 인가되기 때문에 접합(junction)파괴 등 소자의 손상을 유발하여 드라이버의 고장을 발생시키는 단점이 있다.However, in the conventional method, since a high voltage, which is an analog power supply, is applied to a source driver, a low voltage, which is a digital voltage, is applied to the source driver, thereby causing damage to the device, such as a junction breakdown, and causing a driver failure.

일반적인 다전원 디바이스는 로우전압부터 입력하여 하이전압을 입력하는 것이 안정하다. 하이 전압을 먼저 입력할 경우 전원 불안 등의 원인에 의해 디바이스의 접합파괴 등 치명적인 에러를 유발할 수 있기에 다전원 입력 디바이스 외부입력전원의 순서를 규정하고 있다. 특정업체는 자체적인 보호회로를 내장하기도 하는 추세이다. In general, a multi-supply device inputs from a low voltage to a high voltage. If a high voltage is input first, it can cause a fatal error such as device breakdown due to power instability. Certain companies tend to embed their own protection circuits.

그러므로 본 발명의 목적은 종래의 단점을 해결하고자 하는 것으로, 액정표시장치의 드라이버 집적회로에 인가되는 전원을 낮은 전압에서 높은 전압의 순서로 인가되도록 하여 회로소자의 신뢰성 및 안정성을 보장하는 액정표시장치 전원 시퀀스 회로를 제공하는 것이다.Therefore, an object of the present invention is to solve the disadvantages of the prior art, the liquid crystal display device to ensure the reliability and stability of the circuit elements by applying the power applied to the driver integrated circuit of the liquid crystal display device in the order of low voltage to high voltage It is to provide a power supply sequence circuit.

상기 목적을 달성하기 위한 이 발명의 구성은,The configuration of the present invention for achieving the above object,

액정표시장치의 드라이버 집적회로에 전원을 공급하는 회로에 있어서,In a circuit for supplying power to a driver integrated circuit of a liquid crystal display device,

아날로그 전원을 입력받아, 디지털 로우전압으로 변환하여 상기 드라이버 집적회로에 출력하는 전압변환기와;A voltage converter configured to receive an analog power source, convert the analog power voltage into a digital low voltage, and output the converted voltage to the driver integrated circuit;

상기 디지털 로우전압이 일정수준에 도달하면, 상기 아날로그 전원을 상기 드라이버 집적회로에 출력하는 스위칭부를 포함하는 것을 특징으로 한다.And a switching unit for outputting the analog power source to the driver integrated circuit when the digital low voltage reaches a predetermined level.

상기 구성에 의하여 이 발명을 실시할 수 있는 가장 바람직한 실시예를 첨부된 도면을 참조로 하여 설명하면 다음과 같다.When described with reference to the accompanying drawings the most preferred embodiment which can implement this invention by the above configuration as follows.

도1은 본 발명의 실시예에 따른 액정표시장치 전원 시퀀스 회로의 구성도이고, 도2는 본 발명의 실시예에 따른 액정표시장치 전원 시퀀스 회로의 각 전압 파형도이다.1 is a configuration diagram of a liquid crystal display power supply sequence circuit according to an embodiment of the present invention, Figure 2 is a voltage waveform diagram of each of the liquid crystal display power supply sequence circuit according to an embodiment of the present invention.

도1에 도시되어 있듯이, 본 발명의 실시예에 따른 액정표시장치 전원 시퀀스 회로의 구성은 액정표시장치의 드라이버 집적회로(2)에 전원을 공급하는 회로로서, 아날로그 전원(Vaa)을 입력받아, 디지털 로우전압(Vdd)으로 변환하여 드라이버 집적회로(2)에 출력하는 전압변환기(1), 전압변환기(1)의 출력단에 일단이 연결된 제1저항(R1) 및 아날로그 전원(Vaa)과 제1저항(R1)의 나머지 단에 연결되어 있는 스위칭부(3)를 포함한다.As shown in FIG. 1, the configuration of the liquid crystal display power supply sequence circuit according to the embodiment of the present invention is a circuit for supplying power to the driver integrated circuit 2 of the liquid crystal display device, and receives an analog power supply (Vaa), The voltage converter 1 converting the digital low voltage Vdd and outputting it to the driver integrated circuit 2, the first resistor R1 connected to the output terminal of the voltage converter 1, the analog power supply Vaa and the first And a switching unit 3 connected to the remaining end of the resistor R1.

스위칭부(2)는 제1저항(R1)에 베이스 단자가 연결되고, 아날로그 전원(Vaa)에 제2저항(R2)을 통해 컬렉터 단자가 연결되며, 에미터 단자가 접지된 제1트랜지스터(Q1)와 아날로그 전원(Vaa)에 소스 단자가 연결되고, 상기 제1트랜지스터(Q1)의 컬렉터 단자에 게이트 단자가 연결되고, 드레인 단자가 상기 드라이버 집적회로(2)에 연결된 제2트랜지스터(Q2)로 이루어진다.The switching unit 2 has a base terminal connected to the first resistor R1, a collector terminal connected to the analog power supply Vaa through a second resistor R2, and a first transistor Q1 having an emitter terminal grounded. Source terminal is connected to the analog power supply (Vaa), the gate terminal is connected to the collector terminal of the first transistor (Q1), and the drain terminal is connected to the second transistor (Q2) connected to the driver integrated circuit (2). Is done.

상기한 제1트랜지스터(Q1)는 엔형 트랜지스터이고, 제2트랜지스터(Q2)는 피형 모스 트랜지스터이다.The first transistor Q1 is an N-type transistor, and the second transistor Q2 is an MOS transistor.

상기 구성에 의한 본 발명의 실시예에 따른 액정표시장치 전원 시퀀스 회로의 작용은 다음과 같다.The operation of the liquid crystal display power supply sequence circuit according to the embodiment of the present invention by the above configuration is as follows.

본 발명의 실시예에서는 소스 드라이버 집적회로의 아날로그 전압과 디지털 전압을 예로 든 것이고, 제1저항(R1)은 블러킹(blocking)용이고, 제2저항(R2)은 제1트랜지스터(Q1)의 턴온 저항보다 매우 크고 제2트랜지스터(Q2)의 턴 오프 저항보다는 매우 작은 저항값을 가진다. In the exemplary embodiment of the present invention, the analog voltage and the digital voltage of the source driver integrated circuit are taken as an example. The first resistor R1 is for blocking and the second resistor R2 is turned on of the first transistor Q1. It has a resistance value that is much larger than the resistance and much smaller than the turn-off resistance of the second transistor Q2.

먼저 사용자에 의해 아날로그 전원(Vaa)이 인가되면, 본 발명의 실시예에 따른 액정표시장치 전원 시퀀스 회로의 동작이 시작된다.First, when the analog power supply Vaa is applied by the user, the operation of the liquid crystal display power supply sequence circuit according to the embodiment of the present invention starts.

동작이 시작되면, 전압변환기(1)는 아날로그 전압(Vaa)을 디지털 전압(Vdd)으로 변환하여 출력한다.When the operation starts, the voltage converter 1 converts the analog voltage Vaa into a digital voltage Vdd and outputs the converted voltage.

이때, 디지털 전압(Vdd)이 제1트랜지스터(Q1)를 턴 온하지 못하는 로우전압이라면, 도1의 A점의 전압(VA)은 'Vaa≥R2/(R2+Q1의 턴 오프 저항)으로서 아날로그 전압(Vaa)에 가깝다.At this time, if the digital voltage Vdd is a low voltage that does not turn on the first transistor Q1, the voltage VA at the point A of FIG. It is close to the voltage (Vaa).

즉, 제2트랜지스터(Q2)를 턴 온하지 못하므로 제2트랜지스터(Q2)의 출력전압(Vpp)은 하이 임피던스 상태로서 그라운드 레벨이며, 도2의 T2이전 상태이다.That is, since the second transistor Q2 cannot be turned on, the output voltage Vpp of the second transistor Q2 is a high impedance state, a ground level, and is a state before T2 in FIG. 2.

시간이 경과함에 따라, 디지털 전압(Vdd)이 정상적인 레벨에 도달하게 되고, 그러면 제1트랜지스터(Q1)의 베이스 단자는 하이레벨이 된다. As time passes, the digital voltage Vdd reaches a normal level, and then the base terminal of the first transistor Q1 becomes high level.

그러면 제1트랜지스터(Q1)가 턴온이 되고, A점의 전압(VA)은 "Vaa×R2/(R2+Q1의 턴 온 저항)'이 되어 그라운드 레벨에 가깝다.Then, the first transistor Q1 is turned on, and the voltage VA at the point A becomes "Vaa x R2 / (turn-on resistance of R2 + Q1)" and is close to the ground level.

다음, 제2트랜지스터(Q2)는 턴 온되고, 제2트랜지스터(Q2)의 출력전압(Vpp)은 드라이버 집적회로(2)에 인가된다.Next, the second transistor Q2 is turned on, and the output voltage Vpp of the second transistor Q2 is applied to the driver integrated circuit 2.

상기 과정의 결과로 도2에서와 같이, 아날로그 전압(Vaa)이 먼저 인가되나 늦게 생성된 디지털 전압(Vdd)이 먼저 드라이버에 집적회로(2)에 인가되는 결과가 된다.As a result of the above process, as shown in FIG. 2, the analog voltage Vaa is applied first, but the late generated digital voltage Vdd is first applied to the integrated circuit 2 by the driver.

만약 입력되는 아날로그 전압(Vaa)이 (-)전원이라면, 제1트랜지스터(Q1)를 피형 트랜지스터로 바꾸고, 제2트랜지스터(Q2)를 엔형 모스 트랜지스터로 바꾸면 된다. If the input analog voltage Vaa is a negative power source, the first transistor Q1 may be replaced with a type transistor, and the second transistor Q2 may be replaced with an N-type MOS transistor.

이상에서와 같이, 본 발명의 실시예에서, 액정표시장치의 드라이버 집적회로에 인가되는 전원을 낮은 전압에서 높은 전압의 순서로 인가되도록 하여 회로소자의 신뢰성 및 안정성을 보장하는 장점을 가진 액정표시장치 전원 시퀀스 회로를 제공할 수 있다. As described above, in the embodiment of the present invention, the liquid crystal display device having the advantage of ensuring the reliability and stability of the circuit elements by applying the power applied to the driver integrated circuit of the liquid crystal display device in the order of low voltage to high voltage A power supply sequence circuit can be provided.

도1은 본 발명의 실시예에 따른 액정표시장치 전원 시퀀스 회로의 구성도이다.1 is a block diagram of a liquid crystal display power supply sequence circuit according to an embodiment of the present invention.

도2는 본 발명의 실시예에 따른 액정표시장치 전원 시퀀스 회로의 각 전압 파형도이다.2 is a voltage waveform diagram of a liquid crystal display power supply sequence circuit according to an embodiment of the present invention.

Claims (3)

액정표시장치의 드라이버 집적회로에 전원을 공급하는 회로에 있어서,In a circuit for supplying power to a driver integrated circuit of a liquid crystal display device, 아날로그 전원을 입력받아, 디지털 로우전압으로 변환하여 상기 드라이버 집적회로에 출력하는 전압변환기와;A voltage converter configured to receive an analog power source, convert the analog power voltage into a digital low voltage, and output the converted voltage to the driver integrated circuit; 상기 디지털 로우전압이 일정수준에 도달하면, 상기 아날로그 전원을 상기 드라이버 집적회로에 출력하는 스위칭부를 포함하여 구성되는 액정표시장치 전원 시퀀스 회로.And a switching unit for outputting the analog power supply to the driver integrated circuit when the digital low voltage reaches a predetermined level. 제1항에 있어서,The method of claim 1, 상기한 스위칭부는, The switching unit, 상기 전압변환기의 출력단에 베이스 단자가 연결되고, 입력 아날로그 전원에 컬렉터 단자가 연결되며, 에미터 단자가 접지된 제1트랜지스터와;A first transistor connected to an output terminal of the voltage converter, a collector terminal connected to an input analog power source, and an emitter terminal grounded; 아날로그 전원(Vaa)에 소스 단자가 연결되고, 상기 제1트랜지스터(Q1)의 컬렉터 단자에 게이트 단자가 연결되고, 드레인 단자가 상기 드라이버 집적회로(2)에 연결된 제2트랜지스터(Q2)를 포함하여 구성되는 것을 특징으로 하는 액정표시장치 전원 시퀀스 회로.A second transistor Q2 having a source terminal connected to an analog power supply Vaa, a gate terminal connected to a collector terminal of the first transistor Q1, and a drain terminal connected to the driver integrated circuit 2; A liquid crystal display power supply sequence circuit, characterized in that. 제2항에 있어서,The method of claim 2, 상기한 제1트랜지스터는 엔형 트랜지스터이고, 제2트랜지스터는 피형 모스 트랜지스터인 것을 특징으로 하는 액정표시장치 전원 시퀀스 회로.And the first transistor is an N-type transistor, and the second transistor is an MOS transistor.
KR1019970076676A 1997-12-29 1997-12-29 LCD Display Power Supply Sequence Circuit KR100483534B1 (en)

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KR20210000067A (en) 2019-06-24 2021-01-04 조계화 Fan

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KR20210000067A (en) 2019-06-24 2021-01-04 조계화 Fan

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