KR100639602B1 - Nematic liquid crystal driving method - Google Patents
Nematic liquid crystal driving method Download PDFInfo
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- KR100639602B1 KR100639602B1 KR1019980019532A KR19980019532A KR100639602B1 KR 100639602 B1 KR100639602 B1 KR 100639602B1 KR 1019980019532 A KR1019980019532 A KR 1019980019532A KR 19980019532 A KR19980019532 A KR 19980019532A KR 100639602 B1 KR100639602 B1 KR 100639602B1
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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
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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
- G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
- G09G3/16—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions by control of light from an independent source
- G09G3/18—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions by control of light from an independent source using liquid crystals
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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
- G09G2310/00—Command of the display device
- G09G2310/06—Details of flat display driving waveforms
- G09G2310/065—Waveforms comprising zero voltage phase or pause
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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
- G09G3/3622—Control of matrices with row and column drivers using a passive matrix
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Abstract
이 발명은 응답속도를 빠르게 하고, 3색 백라이트에 의한 칼라화나 동적인 화상의 재생에 있어서, 브라운관 사용의 디스플레이와 동등 이상의 성능을 얻을 수 있게 하기 위한 것이며, 2개의 전극의 사이에 끼워진 네마틱액정과 편광판을 조합시켜 이루어지는 액정표시장치에 있어서, 2개의 전극의 사이의 전압을 소정의 주기에 소정시간과 소정전압으로 유지하게 한다.This invention is intended to increase the response speed and to achieve a performance equal to or higher than that of a CRT display in colorization and dynamic image reproduction by three-color backlight, and a nematic liquid crystal sandwiched between two electrodes. In the liquid crystal display device which combines and a polarizing plate, the voltage between two electrodes is hold | maintained at predetermined time and predetermined voltage at predetermined period.
Description
이 발명은 액정의 구동방법, 특히, 네마틱액정의 구동방법에 관한 것이다.The present invention relates to a method of driving a liquid crystal, in particular a method of driving a nematic liquid crystal.
투명전극을 갖는 2장의 투명한 평판에 네마틱액정을 끼우고 2장의 편광판의 사이에 두면, 상기 2개의 투명전극에 가하는 전압에 따라 상기 2장의 편광판을 통하는 빛의 투과율이 변화하는 것으로 알려져 있다.It is known that when a nematic liquid crystal is sandwiched between two transparent plates having transparent electrodes and placed between two polarizing plates, the transmittance of light through the two polarizing plates changes depending on the voltage applied to the two transparent electrodes.
이 원리를 이용한 액정표시장치는 두께가 얇고 전력소비가 적은 것 등과 같은 특징을 갖고 손목시계나 전자계산기를 비롯하여 널리 사용되고 있다.Liquid crystal displays using this principle have features such as thin thickness and low power consumption, and are widely used including watches and electronic calculators.
또한, 근년에는 칼라필터와 조합해서 노트북컴퓨터나 소형의 액정텔레비젼 등의 칼라표시 디스플레이장치에 사용되고 있다.In recent years, in combination with color filters, it has been used in color display displays such as notebook computers and small liquid crystal televisions.
칼라필터와 조합해서 칼라표시가 가능하게 한 액정표시장치에 있어서는 적, 녹, 청의 3색의 도트를 조합해서 칼라표시를 행하고 있지만, 이 칼라필터는 매우 고가이고, 패널에 길게 맞추는 작업도 높은 정밀도가 요구된다.In the liquid crystal display device in which color display is possible in combination with a color filter, the color display is performed by combining three colors of red, green, and blue dots. However, this color filter is very expensive, and the work of fitting the panel for a long time is also highly accurate. Is required.
또한, 흑백의 액정표시패널과 동등한 해상도를 내기 위해서는 3배의 도트수가 필요하기 때문에 통상의 액정패널로서는 수평방향의 구동회로의 수가 3배로 되어 버리고, 비용이 소요됨과 아울러 패널과 구동회로의 접속점의 수도 3배로 되기 때문에, 접속작업도 곤란해져 버린다.In addition, three times the number of dots is required to achieve the same resolution as that of a black and white liquid crystal display panel. As a result, the number of driving circuits in the horizontal direction is tripled for the liquid crystal panel. As the number of times triples, connection work becomes difficult.
따라서, 액정패널을 사용해서 칼라표시를 하는 방법으로서, 칼라필터를 사용하는 방식은 비용적으로는 고가로 될 요소가 많고, 저렴하게 제조하기가 곤란했었다. 또한, 칼라필터에 의한 빛의 투과율이 약 20퍼센트 내외로 되고, 칼라필터를 사용함으로써 밝기가 약 5분의 1로 되어 버리기 때문에, 백라이트의 소비전력이 매우 커져 버리는 단점이 있었다.Therefore, as a method of color display using a liquid crystal panel, the method of using a color filter has many factors that will be expensive in terms of cost, and it has been difficult to manufacture inexpensively. In addition, since the light transmittance of the color filter is about 20 percent and the brightness is about one fifth by using the color filter, the power consumption of the backlight is very large.
또한, 종래의 액정표시장치는 액정의 응답속도가 느리기 때문에, 텔레비젼 등의 동적인 화상을 재생하는 경우나, 퍼스널 컴퓨터 등의 마우스 커서를 고속으로 이동시킨 경우 등에는 브라운관을 사용한 디스플레이에 비교해서 성능적으로 열악했다.In addition, the conventional liquid crystal display device has a slow liquid crystal response speed. Therefore, the performance of the conventional liquid crystal display device is higher than that of a display using a CRT when reproducing a dynamic image such as a television or moving a mouse cursor such as a personal computer at a high speed. The enemy was bad.
칼라필터를 사용하지 않은 칼라액정표시장치로서는 일본 특허공개평성1-179914호와 같이 흑백액정패널과 3색의 백라이트를 조합해서 칼라표시를 행하는 방법이 제안되고 있고, 칼라필터방식에 비교해서 저렴하게 고도로 정밀한 칼라표시를 실현시킬 가능성이 있다. 그러나, 종래의 액정구동방법에서는 네마틱액정의 응답속도는 수십 밀리초 내지 수백 밀리초가 걸렸다. 따라서, 네마틱액정을 사용한 액정패널로서는 3색 백라이트에 의한 칼라화를 실현할 수 있는 응답속도인 8밀리초 이하의 응답속도를 얻기는 곤란할 것으로 여겨진다.As a color liquid crystal display device that does not use a color filter, a method of performing color display by combining a black and white liquid crystal panel and three colors of backlights has been proposed as in Japanese Patent Application Laid-Open No. Hei 1-79914, which is cheaper than the color filter method. There is a possibility of realizing highly accurate color display. However, in the conventional liquid crystal driving method, the response speed of the nematic liquid crystal took several tens of milliseconds to several hundred milliseconds. Therefore, it is considered difficult for a liquid crystal panel using nematic liquid crystals to obtain a response speed of 8 milliseconds or less, which is a response speed capable of realizing colorization by three-color backlights.
고속으로 동작하는 액정패널로서 강유전액정이나 반강유전액정을 사용한 액정패널이 제안되고 있지만, 액정의 셀갭이 1μm 이하로 매우 좁은 갭으로 할 필요가 있는 것 등으로 인해, 제조가 곤란하고, 실용화에 이르지 못했다.Liquid crystal panels using ferroelectric liquid crystals and antiferroelectric liquid crystals have been proposed as liquid crystal panels operating at high speed. I couldn't.
이 발명이 해결하려는 과제는 구동방법의 변경에 의해 종래로부터 이용하고 있는 TN형이나 STN형의 네마틱액정의 응답속도를 빠르게 하고, 앞서 설명한 3색의 백라이트에 의한 칼라화나 동적인 화상의 재생에 의해서 브라운관을 사용한 디스플레이와 동등 이상의 성능을 얻을 수 있게 하는 것이고, 즉, 응답속도가 빠른 네마틱액정의 구동방법을 제공하는 것이다.The problem to be solved by the present invention is to speed up the response speed of the nematic liquid crystals of the TN type or STN type conventionally used by changing the driving method, and to improve the colorization and dynamic image reproduction by the three-color backlight described above. By this, it is possible to obtain a performance equal to or higher than that of a display using a CRT, that is, to provide a method of driving a nematic liquid crystal having a fast response speed.
상기 과제를 해결하기 위해 이루어진 이 발명은 종래의 액정의 구동회로와 다른 타이밍으로 액정에 전압을 가함으로써 액정의 응답속도를 빠르게 함을 특징으로 하는 것이다.The present invention made to solve the above problems is characterized in that the response speed of the liquid crystal is increased by applying a voltage to the liquid crystal at a different timing than the conventional driving circuit of the liquid crystal.
이 발명자는 3색 백라이트에 의한 칼라화를 실현할 수 있는 응답속도를 갖는 액정패널을 개발하기 위해 네마틱액정의 인가전압파형과 광투과율의 동적인 특성의 측정을 행했는 바, 인가전압의 파형에 따라서는 인가전압이 변화한 때에 광투과율이 고속으로 변화하는 상태가 존재하는 것이 판명되었다.This inventor measured dynamic voltage characteristics of applied voltage waveform and light transmittance of nematic liquid crystal in order to develop a liquid crystal panel having a response speed that can realize colorization by three-color backlight. Accordingly, it has been found that there exists a state where the light transmittance changes at a high speed when the applied voltage changes.
이 광투과율이 고속으로 변화하는 상태를 반복적으로 발생시킴으로써 종래의 구동방법에 비해 응답속도가 매우 빠르고 밝은 저소비전력의 칼라액정패널을 얻는 것이 가능해졌다.By repeatedly generating a state in which the light transmittance changes at a high speed, it is possible to obtain a color liquid crystal panel having a very fast response speed and a bright low power consumption compared with the conventional driving method.
[발명의 실시의 형태][Embodiment of the Invention]
도 1은 이 발명의 실시의 형태를 나타내는 것이고, 네마틱액정 패널에 대한 인가전압파형과 그 절대치, 광투과율의 변화를 나타내고 있다. 도 2는 이 발명의 실시의 형태에 대응한 종래기술에 있어서의 네마틱액정 패널에 대한 인가전압파형과 그 실효치, 광투과율의 변화를 나타내고 있다.Fig. 1 shows an embodiment of this invention, and shows a change in the applied voltage waveform, the absolute value thereof, and the light transmittance of the nematic liquid crystal panel. Fig. 2 shows changes in applied voltage waveforms, effective values, and light transmittances of the nematic liquid crystal panel in the prior art corresponding to the embodiment of the present invention.
도 1 및 도 2에 있어서의 네마틱액정 패널은 종래부터 사용되고 있는 TN 액정 또는 STN 액정을 사용하여 액정재료 및 셀갭 등을 최적화하여 고속화한 패널이고, 도 1 및 도 2에 있어서의 액정패널은 동일의 패널에 대한 것이다. 또한, 도 1 및 도 2에 있어서의 T1 내지 T6은 동일시간이고, 시간의 길이는 앞서 설명한 3색 백라이트방식에 의한 칼라화에 필요한 액정의 구동주기인 8밀리초 이하의 시간이다.The nematic liquid crystal panel shown in FIGS. 1 and 2 is a panel obtained by optimizing a liquid crystal material, a cell gap, and the like by using a TN liquid crystal or an STN liquid crystal, which has been conventionally used, and speeding up the liquid crystal panel in FIGS. 1 and 2. Is for the panel. In addition, T1 to T6 in FIGS. 1 and 2 are the same time, and the length of time is 8 milliseconds or less, which is the driving period of the liquid crystal required for colorization by the three-color backlight method described above.
종래부터 알려진 바와 같이, 액정의 인가전압에 대한 광투과율의 변화는 인가하는 전압의 극성에는 관계가 없다. 다만, 액정에 직류전압을 계속 인가하면, 액정재료가 전기화학반응에 의해 열악해지는 것 등과 같은 문제가 있기 때문에, 일정시간마다 인가하는 전압의 극성을 반전시키는 것이 일반적으로 행해지고 있다. 이 발명의 실시예에서도 극성반전은 행해지고 있지만, 이 발명의 목적인 액정의 고속구동에 대해서 극성반전을 행함으로써 액정의 동작속도는 크게 변하지 않는다. 이 발명에 있어서의 액정의 인가전압에서는 극성에 관계 없이 절대치가 문제로 된다. 아래에서는 도 1 및 도 2의 비교에 의해 이 발명의 동작을 설명한다.As is known in the art, the change in the light transmittance with respect to the applied voltage of the liquid crystal is irrelevant to the polarity of the applied voltage. However, if a direct current voltage is continuously applied to the liquid crystal, there is a problem such that the liquid crystal material is poor due to an electrochemical reaction. Therefore, it is generally performed to reverse the polarity of the voltage to be applied every predetermined time. Polarity inversion is also performed in the embodiment of the present invention, but the polarization inversion is performed with respect to the high speed driving of the liquid crystal, which is the object of the present invention, and the operation speed of the liquid crystal does not change significantly. In the voltage applied to the liquid crystal in this invention, the absolute value becomes a problem regardless of the polarity. In the following, the operation of the present invention will be described by comparison of FIGS. 1 and 2.
이 발명의 실시의 형태에 의한 구동방법에서는 도 1에 보이듯이 T1 내지 T6의 각각의 기간에 있어서 화상데이터에 따라 인가전압의 절대치가 V1이나 0V의 어느 것으로 되어 있는 시간과, 일정한 주기에서 일정한 시간과 인가전압의 절대치가 반드시 0V로 되어 있는 2개의 상태가 존재하고 있다.In the driving method according to the embodiment of the present invention, as shown in Fig. 1, the time when the absolute value of the applied voltage is either V1 or 0V according to the image data in each of the periods of T1 to T6, and a constant time at a constant period. There are two states in which the absolute value of the overvoltage is always 0V.
도 1에 있어서, T3 및 T5의 기간에는 인가전압의 절대치가 내내 0이고 광투과율도 흑의 상태 그대로이다.In Fig. 1, in the periods of T3 and T5, the absolute value of the applied voltage is zero all the time and the light transmittance remains black.
도 1에 있어서, T1, T2, T4 및 T6의 기간에서는 우선 인가전압의 절대치가 V1으로 되며, 광투과율이 백의 상태로 변한다. 이어서, 인가전압의 절대치가 0V로 되고, 광투과율이 흑의 상태로 변한다. 따라서, 각각의 기간에 광투과율이 흑으로부터 백으로 변화하고, 그 후 다시 흑으로 고속으로 복귀한다.In Fig. 1, in the periods of T1, T2, T4, and T6, first, the absolute value of the applied voltage becomes V1, and the light transmittance changes to a white state. Then, the absolute value of the applied voltage becomes 0V, and the light transmittance changes to the black state. Therefore, in each period, the light transmittance changes from black to white, and then returns to black again at a high speed.
종래의 구동방법에서는 도 2에 보이듯이 표시해야 할 화상데이터에 의해 인가전압의 절대치가 V2나 0V의 어느 것으로 되지만, 다음의 화상데이터로 전환되기까지의 기간에는 인가전압의 절대치가 일정하다. 이러한 구동방법에서는 TN 액정 또는 STN 액정패널은 동작속도가 느리고, 예를 들면, 도 2의 T2 내지 T3와 같이 인가전압이 V2로부터 0V로 변화하더라도 T3의 기간에서는 광투과율이 완전히 흑으로 되지 않는다.In the conventional driving method, as shown in Fig. 2, the absolute value of the applied voltage is either V2 or 0V depending on the image data to be displayed, but the absolute value of the applied voltage is constant in the period until switching to the next image data. In this driving method, the TN liquid crystal or the STN liquid crystal panel has a slow operation speed. For example, even if the applied voltage is changed from V2 to 0V as in T2 to T3 of FIG. 2, the light transmittance does not become completely black in the period of T3.
도 1 및 도 2를 비교하면, 광투과율을 백의 상태로 하기 위해 가하는 전압이 종래의 구동방법에서는 도 2와 같이 V2이었지만, 이 발명의 실시의 형태에서는 도 1과 같이 V2보다 높은 V1의 전압을 가할 수 있다. 따라서, 광투과율이 흑으로부터 백으로 변화하는 시간은 이 발명의 실시의 형태의 경우에서 고속화할 수 있다. 또한, 이 발명의 실시의 형태와 같이 일정주기에서 일정한 시간에 인가전압의 절대치가 반드시 0V로 됨으로써 백으로부터 흑으로 변화하는 시간도 고속화할 수 있다.Comparing Fig. 1 and Fig. 2, although the voltage applied to bring the light transmittance into the bag state was V2 as shown in Fig. 2 in the conventional driving method, in the embodiment of the present invention, a voltage of V1 higher than V2 as shown in Fig. 1 is applied. Can be added. Therefore, the time when light transmittance changes from black to white can be speeded up in the case of embodiment of this invention. In addition, as in the embodiment of the present invention, since the absolute value of the applied voltage is always 0V at a constant time in a constant cycle, the time of changing from white to black can also be increased.
이 발명의 실시의 형태에서는 도 1과 같이 T1 내지 T6의 각각의 기간의 평균전압이 거의 0V로 되도록 각각의 기간내에 극성반전을 행하고 있다. 이 것은 액정이 고속으로 동작하기 때문에 각각의 기간마다 극성을 반전하면, 정의 인가전압과 부의 인가전압의 미묘한 절대치의 차이로부터 플리커가 발생해 버리기 때문이다.In the embodiment of the present invention, as shown in Fig. 1, the polarity inversion is performed within each period so that the average voltage of each period of T1 to T6 becomes almost 0V. This is because, because the liquid crystal operates at high speed, if the polarity is reversed in each period, flicker occurs from the subtle difference between the positive and negative applied voltages.
이 발명의 실시형태에서는 전압무인가의 상태로 흑을 표시하는 노말리블랙의 액정패널에 대해서 설명했지만, 일정주기에서 일정시간에 가하는 전압을 변경함으로써 전압무인가의 상태에서 백을 표시하는 노말리화이트의 액정패널에 대해서도 마찬가지의 효과를 발휘할 수 있다. 또한, 액정의 인가전압과 광투과율의 관계가 일반적인 액정패널과 다른 특수한 액정패널에 대해서도 마찬가지로 일정주기로 일정시간에 가하는 전압을 적정한 값으로 설정함으로써 마찬가지의 효과를 발휘할 수 있다.In the embodiment of the present invention, a liquid crystal panel of normally black which displays black in a state where no voltage is applied has been described. However, the normal white of which white is displayed in a state where no voltage is applied by changing a voltage applied at a constant time in a constant period is explained. The same effect can also be exhibited with respect to a liquid crystal panel. In addition, similar effects can be exerted by setting a voltage applied to a predetermined time at a predetermined period to a special liquid crystal panel in which the relationship between the applied voltage of the liquid crystal and the light transmittance is different from the general liquid crystal panel.
이 발명의 실시의 형태에 있어서, 콘트라스트비가 높게 표시를 행하기 위해서는 주기적으로 액정패널의 광투과율이 변화한 후에 광투과율이 원래의 상태로 복귀할 필요가 있다.In the embodiment of the present invention, in order to display with a high contrast ratio, it is necessary to periodically return the light transmittance to the original state after the light transmittance of the liquid crystal panel changes.
따라서, 이 발명의 실시의 형태에 있어서는 프레임주기를 짧게 하면, 광투과율이 완전히 원래의 상태로 복귀하기 전에 다음 주기로 이동해 버리고, 콘트라스트가 낮아져 버린다. 한편, 프레임주기를 지체시키면, 플리커가 발생하는 것 등과 같은 단점이 생겨 버린다.Therefore, in the embodiment of the present invention, if the frame period is shortened, the light transmittance moves to the next period before the light transmittance completely returns to the original state, and the contrast is lowered. On the other hand, if the frame period is delayed, disadvantages such as flickering occur.
광투과율이 원래의 상태로 복귀하는 시간은 액정재료의 특성, 특히, 액정재료의 점성 등에 의해 크게 변화한다.The time for the light transmittance to return to its original state varies greatly due to the characteristics of the liquid crystal material, in particular, the viscosity of the liquid crystal material and the like.
따라서, 광투과율이 원래의 상태로 복귀하는 시간이 짧은 액정재료를 선택함으로써 플리커의 발생을 억제하면서 콘트라스트비가 높은 표시를 행하는 것도 가능해진다.Therefore, by selecting a liquid crystal material having a short time for the light transmittance to return to its original state, it is possible to perform display with a high contrast ratio while suppressing generation of flicker.
또한, 광투과율이 원래의 값으로 복귀하는 시간이 액정재료의 점성 등에 크게 영향을 받으므로, 액정패널의 온도를 높임으로써 액정재료를 변경하지 않고도 콘트라스트비가 높은 표시를 행하는 것도 가능해진다.In addition, since the time at which the light transmittance returns to the original value is greatly influenced by the viscosity of the liquid crystal material and the like, it is also possible to display a high contrast ratio without changing the liquid crystal material by increasing the temperature of the liquid crystal panel.
이 발명에 의하면, 전압파형을 변경함으로써 액정패널에 화상을 그리고, 그 화상이 완전히 사라지기까지가 매우 짧은 시간에 행해지는 것이 가능해지고, 매우 고속의 응답속도가 얻어지며, 동적인 화상의 재생에 가장 적합한 방식이다.According to the present invention, by changing the voltage waveform, it is possible to draw an image on the liquid crystal panel and to completely disappear the image in a very short time, to obtain a very high response speed, and to reproduce dynamic images. This is the best way.
또한, 이 발명에 의하면, TFT방식에 사용되는 인가전압파형과 기본적으로 동일하고, TFT방식의 액정패널에 사용할 수 있다. 덧붙여서, 기타의 구동방식에 대해서도 인가전압을 일정주기에서 일정시간에 소정의 전압으로 함으로써 액정의 동작속도를 고속화할 수 있다.Further, according to the present invention, it is basically the same as the applied voltage waveform used in the TFT method, and can be used for the liquid crystal panel of the TFT method. In addition, in other driving systems, the operating speed of the liquid crystal can be increased by setting the applied voltage to a predetermined voltage at a predetermined time at a predetermined cycle.
또한, 액정패널에 화상을 그리고, 그 화상이 완전히 사라지기까지가 1 프레임주기중에 행해지는 방식이기 때문에, 앞서 설명한 3색 백라이트를 사용한 칼라표시방법에 최적인 방법이고, 고성능이자 낮은 가격인 칼라표시 디스플레이를 실현할 수 있다.In addition, since the image is drawn on the liquid crystal panel and the image disappears completely in one frame period, it is an optimal method for the color display method using the three-color backlight described above, and high performance and low price color display. The display can be realized.
도 1 - 이 발명의 네마틱액정의 인가전압의 변화에 대한 광투과율의 시간변화를 나타내는 도면1 is a diagram showing a time change of light transmittance with respect to a change in the applied voltage of the nematic liquid crystal of the present invention.
도 2 - 종래기술에 따른 네마틱액정의 인가전압의 변화에 대한 광투과율의 시간변화를 나타내는 도면FIG. 2 is a diagram illustrating a time variation of light transmittance with respect to a change in applied voltage of a nematic liquid crystal according to the prior art. FIG.
Claims (11)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26781997A JPH1184341A (en) | 1997-09-12 | 1997-09-12 | Method for driving nematic liquid crystal |
| JP97-267819 | 1997-09-12 |
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|---|---|
| KR19990029212A KR19990029212A (en) | 1999-04-26 |
| KR100639602B1 true KR100639602B1 (en) | 2006-12-19 |
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| KR1019980019532A KR100639602B1 (en) | 1997-09-12 | 1998-05-28 | Nematic liquid crystal driving method |
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| EP (1) | EP0903721A3 (en) |
| JP (1) | JPH1184341A (en) |
| KR (1) | KR100639602B1 (en) |
| CN (1) | CN1161729C (en) |
| CA (1) | CA2243383C (en) |
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| DE2346974A1 (en) * | 1973-09-18 | 1975-04-03 | Commissariat Energie Atomique | Nematic crystal display junction-points values control - uses stimulation signals from voltage sources to junction electrodes |
| DD292601A7 (en) * | 1987-04-15 | 1991-08-08 | Zentralinstitut Fuer Elektronenphysik,De | METHOD FOR CONTROLLING A LIQUID CRYSTAL CELL |
| JPH03132692A (en) * | 1989-10-18 | 1991-06-06 | Matsushita Electric Ind Co Ltd | Method for driving liquid crystal display device and its driving circuit |
| US5088806A (en) * | 1990-01-16 | 1992-02-18 | Honeywell, Inc. | Apparatus and method for temperature compensation of liquid crystal matrix displays |
| JP2901438B2 (en) * | 1992-10-07 | 1999-06-07 | シャープ株式会社 | Driving method of liquid crystal display device |
| JPH1069260A (en) * | 1996-08-26 | 1998-03-10 | Buraito Kenkyusho:Kk | Method for driving nematic liquid crystal |
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| CN1161729C (en) | 2004-08-11 |
| CN1211778A (en) | 1999-03-24 |
| CA2243383C (en) | 2012-12-18 |
| CA2243383A1 (en) | 1999-03-12 |
| EP0903721A2 (en) | 1999-03-24 |
| JPH1184341A (en) | 1999-03-26 |
| KR19990029212A (en) | 1999-04-26 |
| EP0903721A3 (en) | 1999-07-21 |
| HK1019106A1 (en) | 2000-01-21 |
| TW421775B (en) | 2001-02-11 |
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