KR100822171B1 - Data filter for TFT-LCD driver - Google Patents

Data filter for TFT-LCD driver Download PDF

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KR100822171B1
KR100822171B1 KR1020020042359A KR20020042359A KR100822171B1 KR 100822171 B1 KR100822171 B1 KR 100822171B1 KR 1020020042359 A KR1020020042359 A KR 1020020042359A KR 20020042359 A KR20020042359 A KR 20020042359A KR 100822171 B1 KR100822171 B1 KR 100822171B1
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enable signal
converting
tft
filter
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KR20040008689A (en
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홍유석
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매그나칩 반도체 유한회사
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • 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
    • G09G3/3614—Control of polarity reversal in general
    • 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
    • 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
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving

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  • Nonlinear Science (AREA)
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Abstract

본 발명은 칩사이즈를 줄이고 소비전력을 감소시킬 수 있는 TFT-LCD 드라이버용 데이터필터에 관한 것이다. 본 발명의 데이터 필터는 데이터변환 인에이블신호에 따라서 데이터 비트를 1의 보수값으로 변환하는 인버터수단과, 화이트 인에이블신호에 따라 필터링된 데이터를 출력하는 데이터 변환수단을 구비하는 TFT-LCD 드라이버용 데이터필터에 있어서, 상기 인버터수단은 상기 데이터비트를 1의 보수값으로 변환하기 위한 변환수단과, 데이터변환 인에이블신호에 따라 상기 변환수단을 통해 변환된 데이터 또는 데이터비트를 그대로 출력신호로서 전달하기 위한 전달수단을 구비하며, 상기 데이터 변환수단은 상기 화이트 인에이블신호에 따라 하이레벨신호 또는 인버터수단의 출력신호를 필터링된 데이터로 출력하기 위한 제1 및 제2변환수단으로 이루어진다. 본 발명의 TFT-LCD 드라이버용 데이터필터는 인버터수단이 4개의 트랜지스터, 데이터 변환수단이 2개의 트랜지스터로 이루어져, 총 6개의 트랜지스터로 구성되므로 면적을 감소시켜 소비전력을 감소시킬 수 있다.The present invention relates to a data filter for a TFT-LCD driver capable of reducing chip size and reducing power consumption. The data filter of the present invention is a TFT-LCD driver having an inverter means for converting a data bit into a one's complement value in accordance with a data conversion enable signal, and a data conversion means for outputting filtered data in accordance with a white enable signal. In the data filter, the inverter means converts the data bits into a complement value of 1, and transfers the data or data bits converted through the converting means as output signals in accordance with a data conversion enable signal. And a transfer means for transmitting the first and second conversion means for outputting the high level signal or the output signal of the inverter means as filtered data according to the white enable signal. In the data filter for TFT-LCD driver of the present invention, since the inverter means is composed of four transistors and the data conversion means is composed of six transistors in total, the area can be reduced to reduce power consumption.

TFT LCD, 드라이버, 데이터필터TFT LCD, Driver, Data Filter

Description

ＴＦＴ-ＬＣＤ 드라이버용 데이터필터{Data filter for TFT-LCD driver} Data filter for TFT-LCD driver             

도 1은 종래의 TFT-LCD 드라이버용 데이터필터의 블럭도,1 is a block diagram of a data filter for a conventional TFT-LCD driver;

도 2는 도 1에 도시된 종래의 데이터필터의 상세회로도,FIG. 2 is a detailed circuit diagram of a conventional data filter shown in FIG. 1;

도 3은 본 발명의 실시예에 따른 TFT-LCD 드라이버용 데이터필터의 상세회로도,3 is a detailed circuit diagram of a data filter for a TFT-LCD driver according to an embodiment of the present invention;

*도면의 주요부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *

100 : 반전수단 200 : 데이터 변환수단100: inversion means 200: data conversion means

101, 103, 201 : PMOS 트랜지스터101, 103, 201: PMOS transistors

102, 104, 202 : NMOS 트랜지스터
102, 104, 202: NMOS transistors

본 발명은 TFT-LCD 드라이버용 데이터필터에 관한 것으로서, 보다 구체적으로는 회로면적을 줄이고 전력소모를 감소시킬 수 있는 데이터필터에 관한 것이다.The present invention relates to a data filter for a TFT-LCD driver, and more particularly, to a data filter capable of reducing a circuit area and reducing power consumption.

소형 TFT-LCD 패널의 구동소자는 저가격화를 위하여 통합되는 추세이며, 이 에 따라 TFT-LCD 콘트롤러와 소오스 드라이버가 통합된 소자가 제작되었다. 이러한 소자는 디스플레이정보를 저장하는 메모리에서 소오스 드라이버로 가는 모든 데이터를 병렬로 연결할 수 있게 됨으로써 인터페이스에 필요한 회로와 전력소모를 줄일 수 있었다. The driving device of small TFT-LCD panel is being integrated for low price, and thus, a device integrating TFT-LCD controller and source driver has been manufactured. These devices can connect all the data from the memory storing the display information to the source driver in parallel, reducing the circuitry and power consumption required for the interface.

그러나, 이로 인하여 콘트롤러내의 메모리로부터 소오스 드라이버로 전달되는 데이터가 2000비트 이상에 이르게 되고, 2000비트 이상의 병렬데이타가 동일한 클럭사이클에 전송되었다. 이를 위하여 데이터를 콘버팅하거나 또는 특정한 값으로 설정하기 위한 필터가 각 비트마다 필요하게 되었다.However, this results in more than 2000 bits of data being transferred from the memory in the controller to the source driver, and more than 2000 bits of parallel data are transmitted in the same clock cycle. To do this, a filter is required for each bit to convert the data or to set a specific value.

이에 따라, TFT-LCD 콘트롤러는 동작특성상 데이터를 1의 보수값으로 바꾸는 기능과, 모든 데이터비트를 "하이레벨(H)" 값으로 바꾸는 기능을 필요로 하는데, 이러한 기능을 데이터 필터로 구현할 수 있다.Accordingly, the TFT-LCD controller requires a function of changing data to one's complement value and a function of changing all data bits to a "high level (H)" value due to its operation characteristics, which can be implemented as a data filter. .

도 1은 종래의 TFT-LCD 드라이버용 데이터 필터의 블록도를 도시한 것이고, 도 2는 도 1에 도시된 데이터필터의 상세회로도를 도시한 것이다. FIG. 1 shows a block diagram of a conventional data filter for a TFT-LCD driver, and FIG. 2 shows a detailed circuit diagram of the data filter shown in FIG.

도 1 및 도 2를 참조하면, 종래의 데이터 필터는 데이터 변환 인에인블신호(IN_EN)에 따라 데이터 비트(DB)를 그대로 출력하거나, 1의 보수값으로 변환하기 위한 반전수단(10)과, 화이트인에이블신호(WT_EN)에 따라 상기 반전수단(10)의 출력신호 또는 "하이레벨(H)" 신호를 필터링된 데이터로(FD)로 출력하는 데이터 변환수단(20)으로 이루어진다.Referring to FIGS. 1 and 2, the conventional data filter may include an inverting means 10 for outputting the data bits DB as they are or converting them into one's complement value according to the data conversion enable signal IN_EN. The data conversion means 20 outputs the output signal of the inversion means 10 or the "high level H" signal as filtered data FD according to the white enable signal WT_EN.

상기 인터버수단(10)은 PMOS 트랜지스터(11)와 NMOS 트랜지스터(12)로 이루어진 제1CMOS 트랜지스터와, PMOS 트랜지스터(PM13)와 NMOS 트랜지스터(14)로 이루 어진 제2CMOS 트랜지스터와, 전달게이트(15)로 이루어진 익스클루시브 노아게이트(XOR)로 이루어진다. The interleaver means 10 comprises a first CMOS transistor comprising a PMOS transistor 11 and an NMOS transistor 12, a second CMOS transistor comprising a PMOS transistor PM13 and an NMOS transistor 14, and a transfer gate 15. It consists of an Exclusive Noah Gate (XOR).

상기 데이터변환수단(20)은 직렬연결된 PMOS 트랜지스터(21) 및 NMOS 트랜지스터(22, 23)와, 상기 화이트인에이블신호(WT_EN)에 따라 전원전압(Vcc)의 하이레벨신호를 필터링된 데이터(FD)로 제공하는 PMOS 트랜지스터(24)로 이루어진다.The data converting means 20 filters the high level signal of the power supply voltage Vcc according to the PMOS transistor 21 and the NMOS transistors 22 and 23 connected in series and the white enable signal WT_EN. It is composed of a PMOS transistor 24 to be provided.

상기한 바와같은 종래의 TFT-LCD 드라이버용 데이터 필터의 동작을 설명하면 다음과 같다.The operation of the conventional data filter for TFT-LCD driver as described above is as follows.

먼저, 데이터변환 인에이블신호(IN_EN)가 하이레벨인 경우에는, 반전수단(10)의 제2CMOS 트랜지스터의 NMOS 트랜지스터(14)가 턴온된다. 그러므로, 데이터비트(DA)는 PMOS 트랜지스터(11)와 NMOS 트랜지스터(12)로 구성된 제1CMOS 트랜지스터를 통해 1의 보수값으로 변환되고, 변환된 데이터는 NMOS 트랜지스터(14)를 통해 데이터 변환수단(20)으로 인가된다. First, when the data conversion enable signal IN_EN is at the high level, the NMOS transistor 14 of the second CMOS transistor of the inverting means 10 is turned on. Therefore, the data bit DA is converted into a complement value of 1 through the first CMOS transistor composed of the PMOS transistor 11 and the NMOS transistor 12, and the converted data is converted into the data conversion means 20 through the NMOS transistor 14. ) Is applied.

다음, 데이터변환 인에이블신호(IN_EN)가 로우레벨인 경우에는 제2CMOS 트랜지스터의 PMOS 트랜지스터(13)가 턴온된다. 따라서 데이터 비트(DA)는 PMOS 트랜지스터(13)를 통해 그대로 데이터 변환수단(20)으로 제공된다.Next, when the data conversion enable signal IN_EN is at the low level, the PMOS transistor 13 of the second CMOS transistor is turned on. Therefore, the data bit DA is provided to the data converting means 20 as it is through the PMOS transistor 13.

데이터 변환수단(20)은 화이트 인에이블신호(WT_EN)가 하이레벨인 경우, NMOS 트랜지스터(22)가 턴온되어 반전수단(10)의 출력신호(Cout11)를 필터링된 데이터(FD)로 출력한다. 한편, 화이트 인에이블신호(WT_EN)가 로우레벨인 경우에는, 데이터 변환수단(20)은 NMOS 트랜지스터(22)가 턴오프되고 PMOS 트랜지스터(24)가 턴온되어 상기 반전수단(10)의 출력신호(Cout11)에 관계없이 하이레벨신호를 필터 링된 데이터(FD)로 출력한다. 따라서, TFT-LCD 화면은 백색으로 표시된다.When the white enable signal WT_EN is at a high level, the data converting means 20 turns on the NMOS transistor 22 to output the output signal Cout11 of the inverting means 10 as filtered data FD. On the other hand, when the white enable signal WT_EN is at the low level, the data converting means 20 turns off the NMOS transistor 22 and the PMOS transistor 24 to turn on the output signal of the inverting means 10. Irrespective of Cout11), a high level signal is output as filtered data FD. Thus, the TFT-LCD screen is displayed in white.

상기한 바와같은 데이터필터는 각 데이터 비트마다 데이터 필터가 필요하며, 각 데이터 필터는 10개의 트랜지스터로 구성된 하나의 익스클루시브 오아게이트와 낸드게이트로 이루어지므로, 전력소모가 커진다. 특히 2000 비트정도의 데이터비트가 병렬로 사용되는 경우에는 약 20000개의 트랜지스터가 필요하므로, 전력소모가 더욱 심각해지는 문제점이 있었다.
The data filter as described above requires a data filter for each data bit, and each data filter is composed of one exclusive or gate and NAND gate composed of ten transistors, thereby increasing power consumption. In particular, when data bits of about 2000 bits are used in parallel, about 20000 transistors are required, and thus power consumption becomes more serious.

본 발명은 상기한 바와같은 종래 기술의 문제점을 해결하기 위한 것으로서, 면적을 감소시켜 전력소모를 감소시킬 수 있는 TFT-LCD 드라이버용 데이터필터를 제공하는 데 그 목적이 있다.
SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art as described above, and an object thereof is to provide a data filter for a TFT-LCD driver which can reduce power consumption by reducing an area.

이와 같은 목적을 달성하기 위한 본 발명은 데이터변환 인에이블신호에 따라서 데이터 비트를 1의 보수값으로 변환하는 반전수단과, 화이트 인에이블신호에 따라 필터링된 데이터를 출력하는 데이터 변환수단을 구비하는 TFT-LCD 드라이버용 데이터필터에 있어서, 상기 반전수단은 상기 데이터비트를 1의 보수값으로 변환하기 위한 변환수단과, 데이터변환 인에이블신호에 따라 상기 변환수단을 통해 변환된 데이터 또는 데이터비트를 그대로 출력신호로서 전달하기 위한 전달수단을 구비하며, 상기 데이터 변환수단은 상기 화이트 인에이블신호에 따라 하이레벨신호 또 는 반전수단의 출력신호를 필터링된 데이터로 출력하기 위한 제1 및 제2변환수단으로 이루어지는 TFT-LCD 드라이버용 데이터필터를 제공하는 것을 특징으로 한다.In order to achieve the above object, the present invention provides a TFT including inverting means for converting a data bit into a complement value of 1 according to a data conversion enable signal, and data converting means for outputting filtered data according to a white enable signal. In the data filter for an LCD driver, the inverting means outputs data or data bits converted through the converting means in accordance with a data converting enable signal and converting means for converting the data bits into a complement value of one. And means for transmitting as a signal, said data converting means comprising first and second converting means for outputting a high level signal or an output signal of an inverting means as filtered data according to said white enable signal. A data filter for a TFT-LCD driver is provided.

이하, 본 발명을 보다 구체적으로 설명하기 위하여 본 발명에 따른 실시예를 첨부 도면을 참조하면서 보다 상세하게 설명하고자 한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to describe the present invention in more detail.

도 3는 본 발명의 실시예에 따른 TFT-LCD 드라이버용 데이터필터의 상세회로도를 도시한 것이다.3 shows a detailed circuit diagram of a data filter for a TFT-LCD driver according to an embodiment of the present invention.

도 3을 참조하면, 본 발명의 실시예에 따른 TFT-LCD 드라이버용 데이터필터는 데이터변환 인에이블신호(IN_EN)에 따라서 데이터 비트(DA)를 그대로 출력하거나 또는 데이터 비트(DA)를 1의 보수값으로 변환하는 반전수단(100)과, 화이트 인에이블신호(WT_EN)에 따라 하이레벨신호를 필터링된 데이터(FD)로 출력하거나 또는 상기 반전수단(100)의 출력신호(Cout21)를 필터링된 데이터(FD)로 출력하는 데이터 변환수단(200)을 구비한다.Referring to FIG. 3, the data filter for a TFT-LCD driver according to an exemplary embodiment of the present invention outputs the data bit DA as it is or according to the data conversion enable signal IN_EN, or complements the data bit DA by one. The inverting means 100 for converting the value into a value, and outputs the high level signal as filtered data FD according to the white enable signal WT_EN, or the output signal Cout21 of the inverting means 100 is filtered. And a data converting means 200 for outputting to (FD).

상기 반전수단(100)은 상기 데이터비트(DA)를 1의 보수값으로 변환하기 위한 변환수단과, 데이터변환 인에이블신호(IN_EN)에 따라 상기 변환수단을 통해 변환된 데이터(Cout20)를 출력신호(Cout21)로서 전달하거나 또는 데이터비트(DA)를 그대로 출력신호(Cout21)로서 전달하기 위한 전달수단을 구비한다.The inverting means 100 converts the data bit DA into a one's complement value, and outputs the data Cout20 converted through the converting means according to the data conversion enable signal IN_EN. Transfer means for transferring as Cout21 or for transmitting the data bit DA as an output signal Cout21 as it is.

상기 변환수단은 상기 데이터비트(DA)가 각각 게이트에 인가되고 전원전압(Vcc)과 접지사이에 직렬연결된 PMOS 트랜지스터(101)와 NMOS 트랜지스터(102)로 구성된 CMOS 트랜지스터로 이루어진다.The converting means comprises a CMOS transistor composed of a PMOS transistor 101 and an NMOS transistor 102 in which the data bits DA are respectively applied to a gate and connected in series between a power supply voltage Vcc and ground.

상기 전달수단은 데이터변환 인에이블신호(IN_EN)에 따라 상기 변환수단을 통해 변환된 데이터(Cout20)를 출력신호(Cout21)로서 전달하기 위한 제1수단과, 상기 데이터변환 인에이블신호(IN_EN)에 따라 상기 데이터비트(DA)를 그대로 출력신호(Cout21)로 전달하기 위한 제2수단으로 이루어진다.The transfer means includes first means for transferring the data Cout20 converted through the conversion means as an output signal Cout21 according to the data conversion enable signal IN_EN, and the data conversion enable signal IN_EN. Accordingly, the data bit DA is provided as a second means for transferring the data bit DA to the output signal Cout21 as it is.

상기 전달수단의 제1 및 제2수단은 각각 상기 데이터변환 인에이블신호(IN_EN)가 각각 게이트에 인가되는 PMOS 트랜지스터(103)와 NMOS 트랜지스터(104)로 이루어진다.The first and second means of the transfer means each comprise a PMOS transistor 103 and an NMOS transistor 104 to which the data conversion enable signal IN_EN is applied to the gate, respectively.

상기 데이터 변환수단(200)은 상기 화이트 인에이블신호(WT_EN)에 따라 하이레벨신호를 필터링된 데이터(FD)로 출력하기 위한 제1수단과, 상기 화이트 인에이블신호(WT_EN)에 따라 반전수단(100)의 출력신호(Cout21)를 필터링된 데이터(FD)로 출력하기 위한 제2수단으로 이루어진다.The data converting means 200 may include first means for outputting a high level signal as filtered data FD according to the white enable signal WT_EN, and an inverting means according to the white enable signal WT_EN. And second means for outputting the output signal Cout21 of 100 as filtered data FD.

상기 데이터 변환수단(200)의 제1 및 제2수단은 전원전압(Vcc)과 반전수단(100)의 출력단(Cout21)사이에 직렬연결되고 화이트 인에이블신호(WT_EN)가 각각 게이트에 인가되는 PMOS 트랜지스터(201)와 NMOS 트랜지스터(202)로 이루어진다. The first and second means of the data converting means 200 are connected in series between the power supply voltage Vcc and the output terminal Cout21 of the inverting means 100 and the PMOS to which the white enable signal WT_EN is applied to the gate, respectively. It consists of a transistor 201 and an NMOS transistor 202.

상기한 바와같은 본 발명의 데이터 필터의 동작을 설명하면 다음과 같다.The operation of the data filter of the present invention as described above is as follows.

데이터비트(DA)는 변환수단인 PMOS트랜지스터(101)와 NMOS 트랜지스터(102)로 구성된 CMOS 트랜지스터를 통해 1의 보수값으로 변환된다. 이때, 데이터변환 인에이블신호(IN_EN)가 하이레벨인 경우에는 변환된 데이터(Cout20)를 NMOS 트랜지스터(104)를 통해 출력신호(Cout21)로서 데이터 변환수단(200)으로 제공하고, 데이터변환 인에이블신호(IN_EN)가 로우레벨인 경우에는 데이터비트(DA)를 PMOS트랜지스 터(103)를 통해 그대로 출력신호(Cout21)로서 데이터 변환수단(200)으로 제공한다.The data bit DA is converted into one's complement value through a CMOS transistor composed of a PMOS transistor 101 and an NMOS transistor 102 which are conversion means. In this case, when the data conversion enable signal IN_EN is at a high level, the converted data Cout20 is provided to the data conversion means 200 as an output signal Cout21 through the NMOS transistor 104, and the data conversion enable is enabled. When the signal IN_EN is at the low level, the data bit DA is directly provided to the data converting means 200 as the output signal Cout21 through the PMOS transistor 103.

상기 데이터 변환수단(200)은 화이트 인에이블신호(WT_EN)가 로우레벨이면 PMOS 트랜지스터(201)가 턴온되어 전원전압(Vcc)의 하이레벨신호를 필터링된 데이터(FD)로 출력하고, 화이트 인에이블신호(WT_EN)가 하이레벨이면 NMOS 트랜지스터(202)가 턴온되어 반전수단(100)의 출력신호(Cout21)를 필터링된 데이터(FD)로 출력한다.
When the white enable signal WT_EN is at a low level, the data conversion means 200 outputs the high level signal of the power supply voltage Vcc as filtered data FD when the PMOS transistor 201 is turned on. When the signal WT_EN is at a high level, the NMOS transistor 202 is turned on to output the output signal Cout21 of the inverting means 100 as filtered data FD.

상기한 바와같은 본 발명에 따르면, 각 데이터비트마다 6개의 트랜지스터로 구성된 데이터필터를 제공함으로써, 면적을 감소시켜 전력소모를 감소시킬 수 있는 이점이 있다.According to the present invention as described above, by providing a data filter consisting of six transistors for each data bit, there is an advantage that can reduce the power consumption by reducing the area.

상기에서는 본 발명의 바람직한 실시예를 참조하여 설명하였지만, 해당 기술 분야의 숙련된 당업자는 하기의 특허 청구의 범위에 기재된 본 발명의 사상 및 영역으로부터 벗어나지 않는 범위 내에서 본 발명을 다양하게 수정 및 변경시킬 수 있음을 이해할 수 있을 것이다.Although described above with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

Claims (5)

데이터변환 인에이블신호에 따라서 데이터 비트를 1의 보수값으로 변환하는 반전수단과, 화이트 인에이블신호에 따라 필터링된 데이터를 출력하는 데이터 변환수단을 구비하는 TFT-LCD 드라이버용 데이터필터에 있어서,A data filter for a TFT-LCD driver, comprising: inverting means for converting a data bit into a one's complement value in accordance with a data conversion enable signal, and data converting means for outputting filtered data according to a white enable signal; 상기 반전수단은 상기 데이터비트를 1의 보수값으로 변환하기 위한 변환수단과, 데이터변환 인에이블신호에 따라 상기 변환수단을 통해 변환된 데이터 또는 데이터비트를 그대로 출력신호로서 전달하기 위한 전달수단을 구비하며,The inverting means includes conversion means for converting the data bits into a complement value of one, and transfer means for transferring the data or data bits converted through the conversion means as output signals in accordance with a data conversion enable signal. , 상기 데이터 변환수단은 상기 화이트 인에이블신호에 따라 하이레벨신호 또는 반전수단의 출력신호를 필터링된 데이터로 출력하기 위한 제1 및 제2변환수단으로 이루어지는 것을 특징으로 하는 TFT-LCD 드라이버용 데이타필터.And said data converting means comprises first and second converting means for outputting a high level signal or an output signal of the inverting means as filtered data in accordance with said white enable signal. 제 1 항에 있어서, The method of claim 1, 상기 반전수단의 변환수단은 상기 데이터비트가 각각 게이트에 인가되고 전원전압과 접지사이에 직렬연결된 PMOS 트랜지스터와 NMOS 트랜지스터로 구성된 CMOS 트랜지스터로 이루어지는 것을 특징으로 하는 TFT-LCD 드라이버용 데이터 필터.And the converting means of the inverting means comprises a CMOS transistor comprising a PMOS transistor and an NMOS transistor in which the data bits are respectively applied to a gate and connected in series between a power supply voltage and a ground. 제 1 항에 있어서, The method of claim 1, 상기 반전수단의 전달수단은 데이터변환 인에이블신호에 따라 상기 변환수단을 통해 변환된 데이터 또는 상기 데이터비트를 그대로 출력신호로서 전달하기 위한 제1 및 제2수단으로 이루어지는 것을 특징으로 하는 TFT-LCD 드라이버용 데이터 필터.The transfer means of the inverting means comprises a first and second means for transferring the data or the data bits converted through the converting means as an output signal in accordance with a data conversion enable signal. Data filter. 제 3 항에 있어서, The method of claim 3, wherein 상기 전달수단의 제1 및 제2수단은 각각 상기 데이터변환 인에이블신호가 각각 게이트에 인가되는 PMOS 트랜지스터와 NMOS 트랜지스터로 이루어지는 것을 특징으로 하는 TFT-LCD 드라이버용 데이터 필터.And a first means and a second means of said transfer means each comprise a PMOS transistor and an NMOS transistor to which said data conversion enable signal is applied to a gate, respectively. 제 1 항에 있어서, The method of claim 1, 상기 데이터 변환수단의 제1 및 제2변환수단은 전원전압과 반전수단의 출력단사이에 직렬연결되고 화이트 인에이블신호가 각각 게이트에 인가되는 PMOS 트랜지스터와 NMOS 트랜지스터로 각각 이루어지는 것을 특징으로 하는 TFT-LCD 드라이버용 데이터 필터.The first and second converting means of the data converting means each comprise a PMOS transistor and an NMOS transistor connected in series between a power supply voltage and an output terminal of the inverting means, respectively, and a white enable signal is applied to a gate. Data filter for driver.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010007288A (en) * 1999-06-09 2001-01-26 가나이 쓰토무 Liquid crystal display apparatus
KR20010015252A (en) * 1999-07-09 2001-02-26 가나이 쓰토무 Liquid crystal display apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010007288A (en) * 1999-06-09 2001-01-26 가나이 쓰토무 Liquid crystal display apparatus
KR20010015252A (en) * 1999-07-09 2001-02-26 가나이 쓰토무 Liquid crystal display apparatus

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