KR100350533B1 - Method for gray a bistable twisted nematic liquid crystal display - Google Patents
Method for gray a bistable twisted nematic liquid crystal display Download PDFInfo
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- KR100350533B1 KR100350533B1 KR1019990052518A KR19990052518A KR100350533B1 KR 100350533 B1 KR100350533 B1 KR 100350533B1 KR 1019990052518 A KR1019990052518 A KR 1019990052518A KR 19990052518 A KR19990052518 A KR 19990052518A KR 100350533 B1 KR100350533 B1 KR 100350533B1
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- 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
- G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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- 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
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
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- G—PHYSICS
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- 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
- G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/139—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
- G02F1/1396—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell
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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
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0469—Details of the physics of pixel operation
- G09G2300/0478—Details of the physics of pixel operation related to liquid crystal pixels
- G09G2300/0495—Use of transitions between isotropic and anisotropic phases in liquid crystals, by voltage controlled deformation of the liquid crystal molecules, as opposed to merely changing the orientation of the molecules as in, e.g. twisted-nematic [TN], vertical-aligned [VA], cholesteric, in-plane, or bi-refringent liquid crystals
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Abstract
쌍안정 트위스티드네마틱 액정표시소자의 계조를 표시할때 쌍안정 트위스티드네마틱 액정표시소자의 자체 메모리 특성을 이용하여 계조를 표시하는 프레임을 비월 주사함으로써 프레임의 주사시간을 줄일 수 있도록 한 쌍안정 트위스티드네마틱 액정소자의 계조방법에 관한 것으로,When displaying the gray level of a bistable twisted nematic liquid crystal display device A bistable twisted twisted frame is used to reduce the scanning time of a frame by interlacing a frame displaying the gray level using its memory characteristic of the bistable twisted nematic liquid crystal display device. Regarding the gradation method of the nematic liquid crystal element,
본 발명은 쌍안정 트위스티드 네마틱 액정소자로 구현되는 하나의 화상을 8 계조 인 7 서브 프레임으로 표현할때, 화상의 홀수 라인에 임의로 설정된 소정의 데이타 값을 갖는 7 서브 프레임을 먼저 주사하고, 이어서 짝수라인에 홀수 라인에서 데이타 값을 유지하고 있지 않은 프레임에 임의로 설정된 데이타값을 주사하도록 한 것을 특징으로 한다.In the present invention, when a single image implemented by a bistable twisted nematic liquid crystal device is represented by 7 subframes, which are 8 gray scales, 7 subframes having predetermined data values arbitrarily set in odd lines of the image are first scanned, and then even. It is characterized by scanning a data value set arbitrarily in a frame which does not hold a data value in odd lines on a line.
Description
본 발명은 쌍안정 트위스티드네마틱 액정소자의 계조방법에 관한 것으로, 보다 상세하게는 쌍안정 트위스티드네마틱 액정표시소자의 계조를 표시할때 쌍안정 트위스티드네마틱 액정표시소자의 자체 메모리 특성을 이용하여 계조를 표시하는 프레임을 비월 주사함으로써 프레임의 주사시간을 줄일 수 있도록 한 쌍안정 트위스티드네마틱 액정소자의 계조방법에 관한 것이다.The present invention relates to a gradation method of a bistable twisted nematic liquid crystal display device. More particularly, the present invention relates to a gray scale method of a bistable twisted nematic liquid crystal display device. The present invention relates to a gradation method of a bistable twisted nematic liquid crystal device so as to reduce scanning time of a frame by interlacing a frame displaying gray scales.
일반적으로 트위스티드 네마틱 액정표시소자는 단순 매트릭스 구동소자 로서, 수퍼 트위스티드 네마틱(SUPER TWISTED NEMATIC ; STN)과 쌍안정 트위스티드네마틱(BISTABLE TWISTED NEMATIC ; BTN)이 있다.Generally, a twisted nematic liquid crystal display device is a simple matrix driving device, and there are a super twisted nematic (STN) and a bistable twisted nematic (BTN).
상기 수퍼 트위스티드 네마틱 액정소자(STN)는 액정분자의 배열이 90°비틀린 액정을 2 매의 편광필터 사이에 두고 구성되어, 액정분자에 전압을 인가하지 않는 상태에서는 투과되는 광이 액정분자의 배열을 따라 90°비틀리면서 편광필터를 통과하고, 상기 액정분자에 전압을 인가하게 되면 투과되는 광은 비트림이 없이 직진하게 되어 편광필터를 통과하지 못하므로 화면상에 검게 표시되는 즉 전압인가시 액정이 광을 차단하는 액정소자이다.The super twisted nematic liquid crystal device (STN) is configured by arranging liquid crystal molecules with 90 ° twisted liquid crystals between two polarizing filters, so that light transmitted through the liquid crystal molecules without applying voltage to the liquid crystal molecules is arranged. When passing through the polarization filter while twisted by 90 ° and applying a voltage to the liquid crystal molecules, the transmitted light goes straight without a bitrim and does not pass through the polarization filter. It is a liquid crystal element which blocks this light.
이와 같이 구동하는 상기 수퍼 트위스티드 네마틱 액정소자는 제조공정이 복잡하지 않고, 가격이 싼 반면에 응답속도가 느리며, 대 화면 구동시 동화상 구현에 어려움이 있다.The super twisted nematic liquid crystal device thus driven is not complicated in manufacturing process, inexpensive but slow in response time, and has difficulty in realizing moving images when driving a large screen.
반면에 상기 쌍안정 트위스티드네마틱 소자(BTN)는 네막틱 소자에 카이잘 물질을 첨가하여 원하는 꼬임각을 갖도록 한 액정표시 소자로, 그 구동은 액정소자에 전압을 인가하지 않은 상태에서 액정분자가 180°의 꼬임각을 갖는 안정된 상태로 존재하고, 상기 상태에서 전압을 인가하면 전계 방향으로 상기 액정분자가 일어서게 되고, 이때 전압을 프레데릭스(Fredericks)전압이라고 한다.On the other hand, the bistable twisted nematic element (BTN) is a liquid crystal display device having a desired twist angle by adding a kajal material to the nemaktic element, and the driving of the liquid crystal molecules without applying voltage to the liquid crystal element It exists in a stable state with a twist angle of 180 °, and when a voltage is applied in this state, the liquid crystal molecules rise in the electric field direction, and the voltage is called Fredericks voltage.
이어서 상기 프레데릭스전압 이상의 리셋 전압이 인가되면, 셀의 중앙부분의 액정분자가 거의 90°로 서게되는 리셋 상태가 된다.Subsequently, when a reset voltage equal to or greater than the Frederik's voltage is applied, the liquid crystal molecules in the center portion of the cell are brought into a reset state where the liquid crystal molecules stand at about 90 °.
상기 리셋 상태에서 다음에 인가하게 되는 선택전압의 크기에 따라 서로 다른 2 가지의 준 안정상태를 가지게 되며, 이때 2 가지 준안정 상태중 하나를 선택하기 위한 경계가 되는 전압을 임계전압이라 한다.In the reset state, two different quasi-stable states are different according to the magnitude of the next selection voltage to be applied next. In this case, a threshold voltage for selecting one of the two metastable states is called a threshold voltage.
따라서 상기 임계전압 보다 크거나, 작은 전압 인가상태에 따라 전체 꼬임각0°또는 360°인 준안정 상태로 전이되고, 이 준안전 상태는 오랜시간 그 상태를 유지하는 메모리 특성을 가지게 되어 스위칭속도가 빨라 대화면의 동화상 구현이 가능하다.Therefore, depending on the voltage applied state greater than or less than the threshold voltage, the transition to a metastable state of the total twist angle of 0 ° or 360 °, this quasi-safe state has a memory characteristic to maintain the state for a long time, the switching speed is It is possible to implement a large screen moving image quickly.
이와같은 동작 특성을 갖는 쌍안정 트위스티드 네마틱소자에 프레임 변조방식을 이용하여 계조 표시를 할때, 종래에는 도 1 에 도시한 바와같이 8 계조로 표시하는 경우, 상기 8 계조는 7 개의 서브 프레임을 실행하여야만 가능하다, 즉 1 개의 화상을 표시할때 각 서브 프레임의 온,오프 데이타 (8개의 데이타값: 0000000, 0000001, 0000011, 0000111, 0001111, 0011111, 0111111, 1111111을 순서에 관계없음)를 순차적으로 조정하면서 주사하여 1 개의 화상을 구현하게 된다.When gray scale display is performed on a bi-stable twisted nematic element having such an operation characteristic by using a frame modulation method, when eight gray levels are conventionally displayed as shown in FIG. 1, the eight gray levels represent seven sub-frames. This is possible only when executing one image, that is, on / off data of each subframe (8 data values: 0000000, 0000001, 0000011, 0000111, 0001111, 0011111, 0111111, 1111111, regardless of the order) Scanning while adjusting to realize one image.
이와같이 종래에는 상기 1 개의 화상을 8 계조로 구현하려면 서브 프레임수는 최소 7 개가 필요하게 되고, 이 7 개의 서브 프레임 모두를 순차적으로 하나 하나 주사하게 되므로 그 만큼 전체 프레임 시간이 증가하게 되는 문제점을 가지고 있었다.As described above, at least seven subframes are required to implement one image in eight grayscales, and thus, the entire frame time is increased accordingly because the seven subframes are sequentially scanned one by one. there was.
따라서 본 발명의 목적은 자체 메모리특성을 가진 쌍안정 트위스티드네마틱 액정소자로 1 개의 화상을 8 계조로 표시할 때, 이 8 계조를 구성하는 7 개의 서브 프레임을 상기 화상의 행 라인 중 먼저 홀수 라인을 주사하고 나서, 짝수 라인을 주사하되, 상기 짝수 라인에서는 상기 홀수 라인에서 주사되지 않은 프레임에 대하여 주사를 실시하도록 함으로써, 서브 프레임의 주사시간을 크게 줄일 수 있도록 하고자 하는데 있다.Accordingly, an object of the present invention is to display the seven sub-frames constituting the eight gradations in the first odd line among the row lines of the images when one image is displayed in eight gradations with a bistable twisted nematic liquid crystal device having its own memory characteristics. After scanning, the even lines are scanned, but the even lines are scanned in a frame not scanned in the odd lines, thereby greatly reducing the scanning time of the subframe.
도 1 은 종래 쌍안정 트위스티드네마틱 액정소자의 계조 프레임1 is a gradation frame of a conventional bistable twisted nematic liquid crystal device
도 2 는 본 발명에 이용되는 쌍안정 트위스티드네마틱 액정소자의 구동회 로도2 is a driving circuit diagram of a bistable twisted nematic liquid crystal device used in the present invention.
도 3 은 본 발명 쌍안정 트위스티드네마틱 액정소자의 계조 프레임3 is a gradation frame of the bistable twisted nematic liquid crystal device of the present invention.
상기의 목적을 실현하기 위하여 본 발명은 쌍안정 트위스티드 네마틱 액정소자로 구현되는 하나의 화상을 8 계조 인 7 서브 프레임으로 표현할때, 화상의 홀수 라인에 임의로 설정된 소정의 데이타 값을 갖는 7 서브 프레임을 먼저 주사하고, 이어서 짝수라인에 홀수 라인에서 데이타 값을 유지하고 있지 않은 프레임에 임의로 설정된 데이타값을 주사하도록 한 것을 특징으로 한다.In order to realize the above object, the present invention provides seven sub-frames having predetermined data values arbitrarily set in odd lines of an image when one image implemented by a bistable twisted nematic liquid crystal device is represented by eight sub-grays of seven sub-frames. Is scanned first, and then the data values arbitrarily set in the frames that do not hold the data values in the odd lines on the even lines.
그러므로 본 발명에 의하면, 쌍안정 트위스티드 네마틱 액정소자로 구현되는 하나의 화상을 8 계조 7 서브 프레임으로 표현시, 홀수 라인에 임의의 데이타 값을 가진 7 서브 프레임을 먼저 주사하고 나서, 짝수 라인에서는 상기 주사된 홀수 라인에서 데이타가 유지되지 않은 프레임에 주사하도록 함으로써, 상기 하나의 화상을 8 계조로 표현시 홀수, 짝수라인의 7 서브 프레임을 모두 주사하지 않아도 되므로, 그 만큼 서브 프레임 주사시간을 줄일 수 있게 된다.Therefore, according to the present invention, when an image implemented by a bistable twisted nematic liquid crystal device is represented by 8 grayscale 7 subframes, the first 7 subframes having arbitrary data values in the odd lines are first scanned, and then in the even lines. By scanning the frame in which no data is maintained in the scanned odd lines, it is not necessary to scan all seven sub-frames of odd and even lines when representing one image in eight gray levels, thereby reducing the sub-frame scanning time by that amount. It becomes possible.
이하 본 발명의 바람직한 실시예를 첨부되는 도면에 의거 상세히 설명하면 다음과 같다.Hereinafter, described in detail with reference to the accompanying drawings, preferred embodiments of the present invention.
도 2 는 본 발명에 이용되는 쌍안정 트위스티드네마틱 액정소자의 구동회로도 이고, 도 3 은 본 발명 쌍안정 트위스티드네마틱 액정소자의 계조 프레임로서,2 is a driving circuit diagram of a bistable twisted nematic liquid crystal device used in the present invention, and FIG. 3 is a gradation frame of the bistable twisted nematic liquid crystal device of the present invention.
쌍안정 트위스티드네마틱 액정소자(BTN)의 구동회로 전체에 전원을 공급하는 전원부(20)와; 입력되는 데이타신호및 동기신호를 기설정된 알고리즘에 의하여 제어하여 제어된 신호를 출력하는 콘트롤러(21)와; 상기 콘트롤러(21)에서 제어되어 출력되는 신호를 받아 메모리 특성을 갖는 쌍안정 트위스티드네마틱 액정(26)의 행에 주사신호를 출력하는 행드라이버(23)와; 상기 콘트롤러(21)로 부터 제어되어 출력되는 신호를 받아 상기 쌍안정 트위스티드네마틱(26)의 열에 데이타신호를 출력하는 상,하 열 드라이버(24)(25)로 구성하게 된다.A power supply unit 20 for supplying power to the entire driving circuit of the bistable twisted nematic liquid crystal device BTN; A controller 21 for controlling the input data signal and the synchronization signal by a predetermined algorithm and outputting a controlled signal; A row driver 23 for receiving a signal controlled by the controller 21 and outputting a scanning signal to a row of a bistable twisted nematic liquid crystal 26 having memory characteristics; The upper and lower column drivers 24 and 25 are configured to receive a signal output from the controller 21 and output a data signal to a column of the bistable twisted nematic 26.
이와 같이 구성되는 쌍안정 트위스티드네마틱 액정소자의 구동회로는 전원부(20)로 부터 전원이 공급되고, 이어서 콘트롤러(21)에 데이타 신호와 동기신호가 입력되게 되면 상기 콘트롤러(21)에서는 기설정된 알고리즘으로 입력되는 신호를 제어하고, 이 제어된 신호를 행드라이브(23)와 열 드라이버(24)(25)에 각각 출력하게 된다.The driving circuit of the bistable twisted nematic liquid crystal device configured as described above is supplied with power from the power supply unit 20, and then a data signal and a synchronization signal are input to the controller 21. The control signal is inputted, and the controlled signal is output to the row drives 23 and the column drivers 24 and 25, respectively.
그러므로 상기 행드라이버(23)와 열드라이버(24)(25)에서는 쌍안정 트위스티드네마틱액정(26)의 행 과 열 각각에 주사신호 및 데이타신호를 출력하여, 하나의 화상을 표시하게 되고, 이때 하나의 화상을 8 계조로 표시한다면, 7 개의 서브 프레임을 콘트롤러(21)의 제어신호에 의하여 상기 행드라이버(23)에서 행으로 주사하여 화상을 표시하게 된다.Therefore, the row driver 23 and the column driver 24 and 25 output a scan signal and a data signal to each of the rows and columns of the bistable twisted nematic liquid crystal 26 to display one image. If one image is displayed in eight gradations, the seven sub-frames are scanned in rows by the row driver 23 according to the control signal of the controller 21 to display the images.
이와 같이 7 개의 서브 프레임을 주사하여 하나의 화상을 표시하는 일련의 과정을 예를들어 설명하면, 상기 콘트롤러(21)에서는 행 드라이버(23)를 통해서 쌍안정 트위스티드네마틱 액정(26)의 홀수 라인에 도 3 에 도시한 바와같이 첫번째 서브 프레임에 최소유효자리비트(LSB)의 데이타값을 준다.As described above, a series of processes of scanning seven sub-frames to display one image will be described. For example, in the controller 21, the odd lines of the bistable twisted nematic liquid crystal 26 through the row driver 23 will be described. As shown in Fig. 3, a data value of least significant digit bit (LSB) is given to the first subframe.
이어서 두번째 서브 프레임에는 2 번째 비트 데이타값을 주게 되면, 상기 홀수 라인의 세번째 서브 프레임에서는 아무 작업을 하지 않게 되는데, 이때 세번째 서브 프레임에는 쌍안정 트위스티드네마틱 액정(26)의 자체 메모리 특성에 의하여상기 홀수 라인의 두번째 서브 프레임의 2 번째 비트 데이타가 그대로 유지되고 있기 때문이다.Subsequently, if a second bit data value is given to the second subframe, no operation is performed in the third subframe of the odd line. In this case, the third subframe may be configured according to its own memory characteristic of the bistable twisted nematic liquid crystal 26. This is because the second bit data of the second subframe of the odd line is maintained as it is.
그러므로 상기 짝수 라인의 세번째 서브 프레임에 2 번째 비트 데이타를 주고, 반면에 상기 홀수 라인의 네번째 서브 프레임에는 최대 유효자리 비트(MSB) 데이타를 주며, 이때 짝수 라인의 네번째 서브 프레임에서는 상기 짝수 라인의 세번째 서브 프레임의 2 번째 비트 데이타가 그대로 유지되고 있기 때문에 아무런 작업을 하지 않게 된다.Therefore, the second bit data is given to the third subframe of the even line, while the maximum significant digit bit (MSB) data is given to the fourth subframe of the odd line, and the third subframe of the even line is given to the fourth subframe of the even line. Since the second bit data of the subframe is maintained as it is, no operation is performed.
한편 홀수 라인의 다섯번째 서브 프레임, 여섯번째 서브 프레임, 일곱번째 서브 프레임에는 아무런 작업을 하지 않게 되는데, 상기 홀수 라인의 네번째 서브프레임에서 최대유효자리 비트(MSB)데이타 값이 일곱번째 서브 프레임까지 그대로 유지되기 때문이다.On the other hand, no operation is performed on the fifth subframe, the sixth subframe, and the seventh subframe of the odd line. In the fourth subframe of the odd line, the maximum significant digit bit (MSB) data value remains until the seventh subframe. Because it is maintained.
반면에 짝수 라인의 다섯번째 서브 프레임은 3 번째 서브 프레임에서 주어진 2 번째 비트 데이타가 유지되지 않기 때문에, 최소유효자리 비트(LSB)를 주고, 여섯번째 서브 프레임에는 다시 최대 유효자리 비트(MSB) 데이타 값을 주게 되는데, 이때 다섯번째 서브 프레임에 주어진 데이타 값이 최소 유효자리 비트(LSB) 데이타 값이므로, 상기 여섯번째 서브 프레임까지 데이타 값이 유지되지 않게 되므로 상기 여섯번째 서브 프레임에 최대유효자리 비트(MSB) 데이타 값을 주게 된다.On the other hand, the fifth subframe of the even line gives the least significant bit (LSB) because the second bit data given in the third subframe is not maintained, and the sixth subframe again has the maximum significant digit bit (MSB) data. In this case, since the data value given in the fifth subframe is the least significant bit (LSB) data value, the data value is not maintained until the sixth subframe. MSB) gives the data value.
그러므로 상기 홀수 라인의 일곱번째 서브 프레임과 짝수 라인의 일곱번째 서브 프레임은 전 서브 프레임의 데이타값이 그대로 유지되게 되므로 아무런 작업을 하지 않아도 하나의 화상을 표시하게 되는 것이다.Therefore, the seventh subframe of the odd-numbered lines and the seventh subframe of the even-numbered lines maintain a data value of all subframes so that one image is displayed without any work.
이상에서 설명한 바와같이 본 발명은 자체 메모리 특성을 갖는 쌍안정 트위스티드네마틱 액정소자로 1 개의 화상을 8 계조로 표시할 때, 이 8 계조를 구성하는 7 개의 서브 프레임을 상기 화상의 행 라인 중 먼저 홀수 라인을 주사하고 나서, 짝수 라인을 주사하는 비월주사를 실시하도록 함으로써 상기 하나의 화상을 8 계조로 표현시 홀수, 짝수라인의 7 서브 프레임을 모두 주사하지 않아도 되므로, 그 만큼 서브 프레임 주사시간을 줄일 수 있게 되고, 나아가서는 전체 프레임을 크게 줄일 수 있는 효과를 제공하게 되는 것이다.As described above, in the present invention, when one image is displayed in eight gray levels with a bistable twisted nematic liquid crystal device having its own memory characteristics, seven sub-frames constituting the eight gray levels are first displayed among the row lines of the image. The interframe scanning time is performed by scanning the odd lines and then performing the interlaced scanning to scan the even lines, so that when the single image is expressed in eight gray levels, it is not necessary to scan all seven subframes of the odd and even lines. It can be reduced, and further, the effect of greatly reducing the entire frame is provided.
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