KR100301663B1 - Operation Method of Plasma Address Liquid Crystal Display - Google Patents
Operation Method of Plasma Address Liquid Crystal Display Download PDFInfo
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- KR100301663B1 KR100301663B1 KR1019980050591A KR19980050591A KR100301663B1 KR 100301663 B1 KR100301663 B1 KR 100301663B1 KR 1019980050591 A KR1019980050591 A KR 1019980050591A KR 19980050591 A KR19980050591 A KR 19980050591A KR 100301663 B1 KR100301663 B1 KR 100301663B1
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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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/13334—Plasma addressed liquid crystal cells [PALC]
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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
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
- G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
- G09G3/293—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for address discharge
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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
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
- G09G3/3662—Control of matrices with row and column drivers using an active matrix using plasma-addressed liquid crystal displays
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J17/00—Gas-filled discharge tubes with solid cathode
- H01J17/38—Cold-cathode tubes
- H01J17/48—Cold-cathode tubes with more than one cathode or anode, e.g. sequence-discharge tube, counting tube, dekatron
- H01J17/485—Plasma addressed liquid crystal displays [PALC]
Abstract
본 발명은 휘도 및 광효율을 향상시키는 플라즈마 어드레스 액정 표시장치의 구동방법에 관한 것이다.The present invention relates to a driving method of a plasma address liquid crystal display device for improving luminance and light efficiency.
본 발명에 따른 플라즈마 어드레스 액정 표시장치의 구동방법은 다수의 음극라인들에 플라즈마 방전을 일으키기 위한 방전펄스를 순차적으로 인가하는 단계와, 플라즈마 방전에 의해 생성된 공간전하를 위한 소거 펄스가 음극라인들에 순차적으로 인가되는 단계를 포함한다.According to an exemplary embodiment of the present invention, a method of driving a plasma address liquid crystal display includes sequentially applying discharge pulses for generating plasma discharge to a plurality of cathode lines, and erasing pulses for space charges generated by the plasma discharge. Sequentially applied to the.
이에따라, 본 발명에 따른 플라즈마 어드레스 액정 표시장치의 구동방법은 방전셀의 오방전을 방지함과 아울러, 광효율 및 휘도를 향상시키게 된다.Accordingly, the driving method of the plasma address liquid crystal display device according to the present invention prevents erroneous discharge of the discharge cells and improves light efficiency and brightness.
Description
본 발명은 평판 표시장치에 관한 것으로, 특히 휘도 및 광효율을 향상시키는 플라즈마 어드레스 액정 표시장치의 구동방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display, and more particularly, to a driving method of a plasma address liquid crystal display for improving brightness and light efficiency.
최근, 액정표시장치(Liquid Crystal Display; 이하 "LCD"라 한다), 전계방출 표시장치(Field Emission Display; 이하 "FED"라 한다) 및 플라즈마 표시장치(Plasma Display Panel; 이하 "PDP"라 한다)등의 평면 표시장치가 활발히 개발되고 있는 추세이다. 이들중에서도 플라즈마 어드레스 액정 표시장치(Plasma Address Liquid Crystal : 이하 "PALC"라 한다)와 PDP는 휘도와 화질이 우수하며 40인치 이상으로 대형화하기에 유리한 장점을 가지고 있어 주목을 받고 있다.Recently, a liquid crystal display (hereinafter referred to as "LCD"), a field emission display (hereinafter referred to as "FED") and a plasma display panel (hereinafter referred to as "PDP") Such flat display devices are being actively developed. Among them, a plasma address liquid crystal display device (hereinafter referred to as " PALC ") and a PDP are attracting attention because they have excellent brightness and image quality and are advantageous for being larger than 40 inches.
도 1을 참조하면, 종래기술에 따른 PALC는 백라이트부, 플라즈마부 및 액정부를 구비한다. PALC는 PDP와 같이 플라즈마 방전을 이용하지만 방전조건에 있어서는 PDP와 다르다. 가장 큰 차이점으로는 방전영역의 크기가 서로 다른 것이다. 예를들어 설명하면, PDP의 방전영역은 화소영역이고 PALC의 방전영역은 스캔라인영역이 된다. 즉, PALC의 방전영역이 PDP의 방전영역에 비해 수천배이상 큼을 알 수 있다. 이와같이, PALC는 스캔라인별로 방전이 일어나므로 균일하고 안정적인 방전을 일으키는 것은 매우 중요하다. 이에 대한 상세한 설명은 후술하기로 한다.Referring to FIG. 1, a PALC according to the related art includes a backlight unit, a plasma unit, and a liquid crystal unit. PALC uses plasma discharge like PDP, but differs from PDP in discharge conditions. The biggest difference is that the discharge area is different in size. For example, the discharge area of the PDP is the pixel area and the discharge area of the PALC is the scan line area. That is, it can be seen that the discharge area of the PALC is thousands of times larger than the discharge area of the PDP. As such, since PALCs generate discharges per scan line, it is very important to generate uniform and stable discharges. Detailed description thereof will be described later.
한편, 백라이트부(10)는 플라즈마부 및 액정부에 광빔을 공급한다. 또한, 플라즈마부는 백라이트부(10)에 대향되도록 하부기판(24)에 부착된 제1 편광판(22)과, 하부기판(24)의 상부에 나란하게 형성된 양극(A) 및 음극(K)과, 하부 기판(4)의 상부에 수직으로 형성된 격벽(34)과, 격벽(34)의 상부에 형성된 절연막(36)을 구비한다. 격벽(34)은 각각의 방전셀을 분할하게 된다. 이때, 하나의 방전셀에는 한쌍의 양극(A)과 음극(K)이 배치되어 있으며 He, Ne등의 방전가스가 채워져 있다. 상기 플라즈마부는 플라즈마 방전에의해 형성된 가상전극을 이용하여 액정의 배열을 변화시키는 스위치소자의 역할을 수행하게 된다. 즉, 플라즈마부는 LCD의 박막 트랜지스터(Thin Film Transistor : 이하 "TFT"라 한다)와 동일한 스위치소자의 기능을 수행하게 된다. 한편, 액정모듈은 절연막(36)의 상부에 형성된 액정층(26)과, 액정층(26)의 상부에 형성된 투명전극(ITO;38)과, 투명전극(38)의 상부에 형성된 칼라필터(Color Filter;28)와, 칼라필터(28)의 상부에 형성된 상부기판(30)과, 상부기판(30)에 부착된 제2 편광판(32)을 구비한다. 제1 및 제2 편광판(22,32)은 광빔의 편광특성을 변화시키게 된다. 또한, 액정층(26)은 절연막(36)과 액정층(26)의 용량분압비에 따라 인가되는 영상신호에 대응하여 광빔의 투과량을 조절하게 된다. 이때, 투명전극(38)의 상부에는 적색(Red; 이하 "R"이라 한다), 녹색(Green; 이하 "G"라 한다) 및 청색(Blue; 이하 "B"라 한다)의 칼라필터가 형성되어 원하는 색을 구현하게 된다.The backlight unit 10 supplies light beams to the plasma unit and the liquid crystal unit. In addition, the plasma unit may include a first polarizing plate 22 attached to the lower substrate 24 to face the backlight unit 10, an anode A and a cathode K formed side by side on the lower substrate 24, and A partition wall 34 formed vertically on the lower substrate 4 and an insulating film 36 formed on the partition wall 34 are provided. The partition wall 34 divides each discharge cell. At this time, a pair of the positive electrode (A) and the negative electrode (K) are arranged in one discharge cell and filled with discharge gases such as He and Ne. The plasma unit serves as a switch element for changing the arrangement of the liquid crystal using the virtual electrode formed by the plasma discharge. In other words, the plasma unit performs a function of a switch element that is the same as a thin film transistor (“TFT”) of an LCD. Meanwhile, the liquid crystal module includes a liquid crystal layer 26 formed on the insulating film 36, a transparent electrode (ITO) 38 formed on the liquid crystal layer 26, and a color filter formed on the transparent electrode 38. A color filter 28, an upper substrate 30 formed on the color filter 28, and a second polarizing plate 32 attached to the upper substrate 30. The first and second polarizers 22 and 32 change the polarization characteristics of the light beam. In addition, the liquid crystal layer 26 adjusts the transmission amount of the light beam in response to an image signal applied according to the capacitance partial pressure ratio of the insulating layer 36 and the liquid crystal layer 26. At this time, a color filter of red (hereinafter referred to as "R"), green (hereinafter referred to as "G"), and blue (hereinafter referred to as "B") is formed on the transparent electrode 38. To achieve the desired color.
한편, 도 2를 결부하여 PALC의 동작원리에 대해서 상세히 살펴보기로 한다. 도 2에 도시된바와같이 방전셀에 배치된 양극(A)에 0V, 음극(K)에 -350V를 인가하면 플라즈마 방전이 일어나게 된다. 이 경우, 방전셀의 내부에는 플라즈마 방전에 의해 형성된 하전입자(42)들에 의해 음극(k)의 주위를 제외하고는 양극전위를 가지게 된다. 이에따라, 플라즈마 스위치(44)가 온(On)되어 양극(A)이 전기적으로 단락(Short)된 가상전극(Virtual Electrode;40)을 형성하게 된다. 즉, 플라즈마 방전이 일어나는 경우 가상전극(40)이 형성되어 양극에 대해서 단락(Short)된 상태를 가지게 된다. 반면에, 플라즈마 방전이 일어나지 않는 경우 플라즈마 스위치(44)는 오프(Off)되어 가상전극(40)이 형성되지 않으므로 양극에 대해서 개방(Open)된 상태를 가지게 된다. 또한, 방전기간중(즉, 가상전극이 형성된 경우) 투명전극(38)에 영상신호가 인가되면, 절연층(36)과 액정층(36)의 용량분압비에 의한 전위차가 액정층(36)에 발생하여 액정의 배열구조를 변화시켜 광빔의 투과량을 조절하게 된다. 이와 같이, 방전셀 내부의 플라즈마 방전이 스위칭 동작을 하고 결과적으로 액정부의 광빔 투과량을 조절하는 역할을 수행하게 된다. 즉, PALC의 플라즈마부는 LCD의 TFT와 동일한 기능을 수행하게 된다. 또한, 방전이 중지된 비선택기간에도 방전셀에는 그 상태가 유지되므로 액정의 상태를 메모리하는 것이 가능하게 된다. 이에따라, PALC는 플라즈마 방전에의해 형성된 가상전극(40)을 이용하여 액정의 배열을 변화시켜 영상신호에 대응하는 화면을 표시하게 된다.Meanwhile, the operation principle of the PALC will be described in detail with reference to FIG. 2. As shown in FIG. 2, when 0 V is applied to the anode A disposed in the discharge cell and −350 V is applied to the cathode K, plasma discharge occurs. In this case, the inside of the discharge cell has the anode potential except for the vicinity of the cathode k by the charged particles 42 formed by the plasma discharge. Accordingly, the plasma switch 44 is turned on to form a virtual electrode 40 in which the anode A is electrically shorted. That is, when the plasma discharge occurs, the virtual electrode 40 is formed to have a short state with respect to the anode. On the other hand, when the plasma discharge does not occur, since the plasma switch 44 is turned off and the virtual electrode 40 is not formed, the plasma switch 44 is open to the anode. In addition, when an image signal is applied to the transparent electrode 38 during the discharge period (that is, when the virtual electrode is formed), the potential difference due to the capacitance partial ratio of the insulating layer 36 and the liquid crystal layer 36 is changed to the liquid crystal layer 36. To occur to change the arrangement of the liquid crystal to control the transmission amount of the light beam. As such, the plasma discharge inside the discharge cell performs the switching operation, and as a result, serves to control the light beam transmission amount of the liquid crystal unit. In other words, the plasma portion of the PALC performs the same function as the TFT of the LCD. In addition, since the state is maintained in the discharge cell even in the non-selection period in which discharging is stopped, the state of the liquid crystal can be memorized. Accordingly, the PALC displays the screen corresponding to the image signal by changing the arrangement of the liquid crystal using the virtual electrode 40 formed by the plasma discharge.
한편, 도 3 및 도 6을 결부하여 종래기술에 따른 PALC의 구동방법에 대해서 살펴보기로 한다.Meanwhile, the driving method of the PALC according to the prior art will be described with reference to FIGS. 3 and 6.
도 3을 참조하면, 플라즈마 방전과 영상신호의 관계를 설명하기 위한 타이밍도가 도시되어 있다. 플라즈마 방전을 일으키기 위해 도 4에 도시된바와같이 양극(A)은 기저전압원(GND)에 공통접속되고, 음극(k)은 각 스캔라인별로 독립된 전극구조를 가지게 된다. 도 3의 (b)에 도시된 바와같이 음극(K)에 부(-)의 전압레벨(예를들면, -350V)을 갖는 펄스를 인가하면 양극과 음극사이에 전위차가 발생하여 제n 라인은 플라즈마 방전을 일으키게 된다. 또한, 플라즈마 방전에 의해 제n 라인의 방전셀 내부에는 양극의 전위를 갖는 공간전하가 존재하게 되어 가상전극(40)을 형성하게 된다. 한편, 시간이 지남에 따라 도 3의 (a)에 도시된 바와같이 방전셀 내부에 존재하는 공간전하는 지수함수적으로 감소하게 된다. 이때, 방전셀 내부의 공간전하량의 변화는 제n+1 라인에서도 동일하게 일어나게 된다. 이와같이, 지수함수적으로 감소하는 공간전하는 플라즈마 방전의 발광효율을 저하시킴과 아울러, 영상신호의 라이팅이 어렵게 되어 오방전을 유발하게 된다. 또한, 방전셀 내부에 공간전하가 분포하는 시점에서, 투명전극(38)에 영상신호가 인가되면, 절연막(26) 및 액정층(36)의 용량분압비에 따른 전압이 도 3의 (c)에 도시된 바와같이 액정층(36)에 인가되어 액정의 배열구조를 변화시켜 화상을 구현하게 된다. 이 경우, 도 3의 (c)에 도시된바와같이 제n 라인에 공급되는 영상신호와 제n+1 라인에 공급되는 영상신호는 액정의 열화를 방지하기 위해 반대의 위상을 가지도록 하는 것이 바람직하다.Referring to FIG. 3, a timing diagram for explaining the relationship between the plasma discharge and the image signal is shown. As shown in FIG. 4, the anode A is commonly connected to the ground voltage source GND, and the cathode k has an independent electrode structure for each scan line to generate a plasma discharge. As shown in FIG. 3B, when a pulse having a negative voltage level (for example, -350 V) is applied to the cathode K, a potential difference occurs between the anode and the cathode, so that the n-th line is It causes a plasma discharge. In addition, the space discharge having the potential of the anode exists inside the discharge cell of the nth line by the plasma discharge, thereby forming the virtual electrode 40. On the other hand, as time goes by, as shown in (a) of FIG. 3, the space charge present in the discharge cell decreases exponentially. At this time, the change of the amount of space charge in the discharge cell is the same in the n + 1th line. As described above, the exponentially decreasing space charge not only lowers the luminous efficiency of the plasma discharge, but also makes it difficult to write an image signal, causing false discharge. In addition, when an image signal is applied to the transparent electrode 38 at the time when space charges are distributed in the discharge cell, the voltage according to the capacitance partial ratio of the insulating film 26 and the liquid crystal layer 36 is shown in FIG. As shown in FIG. 2, the liquid crystal layer 36 is applied to the liquid crystal layer 36 to change the arrangement of the liquid crystals to implement an image. In this case, as shown in (c) of FIG. 3, it is preferable that the video signal supplied to the nth line and the video signal supplied to the n + 1th line have opposite phases to prevent deterioration of the liquid crystal. Do.
한편, 도 5에 도시된 바와같이 플라즈마 방전에 의해 형성된 공간전하가 지수적으로 감소되는 시간을 디케이 타임(Decay Time; t)이라고 할때, 디케이 타임(t)에 따라 액정패널의 투과율이 달라짐을 알 수 있다. 또한, 디케이 타임(t)이 종료되는 시점에 계조 제어전압이 소정시간(예를들면, 20㎲)동안 인가된다. 이 경우, 디케이 타임(t)이 길면 길수록 액정패널을 투과하는 광 투과량은 줄어들어 도 6에 도시된 바와같이 휘도 및 광 효율을 저하시키게 됨을 알수있다. 예를들어 설명하면, 디케이 타임(t)이 "0㎲"인 경우의 광투과율은 100%인 반면에 디케이 타임(t)이 "18㎲"인 경우의 광투과율은 50%가 됨을 알수있다. 한편, 디케이 타임(t)이 "18㎲"이후에서는 액정이 포화되어 영상신호의 라이팅이 불가능하게 된다.Meanwhile, as shown in FIG. 5, when the time when the space charge formed by plasma discharge is exponentially reduced is called decay time (t), the transmittance of the liquid crystal panel varies according to the decay time (t). Able to know. In addition, the gray scale control voltage is applied for a predetermined time (for example, 20 ms) at the end of the decay time t. In this case, the longer the decay time (t), the smaller the amount of light transmitted through the liquid crystal panel, and as shown in FIG. For example, it can be seen that the light transmittance when the decay time t is "0 ms" is 100% while the light transmittance when the decay time t is "18 ms" is 50%. On the other hand, after the decay time t is " 18 ms ", the liquid crystal is saturated, making it impossible to write the video signal.
상술한 바와같이, 디케이 타임(t)이 길수록 PALC의 화질, 휘도 및 그레이 스케일(Gray Scale)등이 저하됨과 아울러, 오방전을 유발시키는 문제점이 도출되고 있다. 이에따라, 디케이 타임을 줄이기 위한 새로운 방안이 요구되고 있는 실정이다.As described above, the longer the decay time t, the lower the image quality, luminance, gray scale, and the like of the PALC, and a problem that causes misdischarge has been derived. Accordingly, a new method for reducing decay time is required.
따라서, 본 발명의 목적은 디케이 타임을 줄여 휘도 및 광효율을 향상시키는 플라즈마 어드레스 액정 표시장치의 구동방법을 제공 하는데 있다.Accordingly, an object of the present invention is to provide a method of driving a plasma address liquid crystal display device which reduces decay time and improves brightness and light efficiency.
도 1은 종래기술에 따른 PALC의 구조를 도시한 사시도.1 is a perspective view showing the structure of a PALC according to the prior art.
도 2는 PALC의 동작원리를 설명하기 위해 도시한 도면.2 is a view for explaining the operation principle of the PALC.
도 3은 방전과 영상신호의 관계를 설명하기 위해 도시한 타이밍도.Fig. 3 is a timing chart showing the relationship between discharge and video signal.
도 4는 도 1의 전극 구성을 도시한 도면.4 is a view showing an electrode configuration of FIG.
도 5는 디케이 타임과 액정패널의 투과율 관계를 설명하기 위해 도시한 타이밍도.5 is a timing diagram illustrating a relationship between decay time and transmittance between liquid crystal panels.
도 6은 디케이 타임에 대한 액정패널의 투과율 변화를 도시한 특성도.6 is a characteristic diagram showing a change in transmittance of a liquid crystal panel with respect to a decay time;
도 7은 본 발명의 일실시예에 따른 PALC의 구동방법을 설명하기 위해 도시한 도면.7 is a view for explaining a method of driving a PALC according to an embodiment of the present invention.
도 8은 본 발명의 다른 실시예에 따른 PALC의 구동방법을 설명하기 위해 도시한 도면.8 is a view for explaining a method of driving a PALC according to another embodiment of the present invention.
< 도면의 주요 부분에 대한 부호의 설명 ><Description of Symbols for Main Parts of Drawings>
10 : 백라이트부 22,32 : 편광필터10: backlight 22, 32: polarization filter
24,52 : 하부기판 26 : 액정24,52: lower substrate 26: liquid crystal
28 : 칼라필터 30 : 상부기판28: color filter 30: upper substrate
34,50 : 격벽 36 : 절연막34, 50 partition 36 insulating film
38 : 투명전극 40 : 가상전극38: transparent electrode 40: virtual electrode
42 : 하전입자 44 : 플라즈마 스위치42: charged particle 44: plasma switch
상기 목적을 달성하기 위하여 본 발명에 따른 플라즈마 어드레스 액정 표시장치의 구동방법은 방전펄스에 상기 플라즈마 방전에 의해 형성된 공간전하를 강제로 제거시키기위한 소거펄스를 부가하여 상기 음극라인에 순차적으로 인가하여 구동한다.In order to achieve the above object, the driving method of the plasma address liquid crystal display device according to the present invention is driven by applying an erase pulse for forcibly removing the space charges formed by the plasma discharge to the discharge pulse and sequentially applying the discharge pulse to the cathode line. do.
상기 목적외에 본 발명의 다른 목적 및 특징들은 첨부도면을 참조한 실시예에 대한 설명을 통하여 명백하게 드러나게 될 것이다.Other objects and features of the present invention other than the above object will become apparent from the description of the embodiments with reference to the accompanying drawings.
도 7 내지 도 8을 참조하여 본 발명의 바람직한 실시예에 대하여 설명 하기로 한다.A preferred embodiment of the present invention will be described with reference to FIGS. 7 to 8.
도 7을 참조하면, 본 발명에 일실시예에 따른 PALC 구동방법을 설명하기 위한 음극라인 구동펄스 파형도가 도시되어 있다. 도 7에 도시된바와같이 음극라인 구동펄스는 플라즈마 방전을 일으키기 위한 방전펄스(Discharge Pulse)와, 플라즈마 방전에 의해 형성된 공간전하를 강제로 제거시키기위한 소거펄스(Erase Pulse)를 방전펄스에 부가시킨 파형을 가지게 된다. 이때, 소거펄스는 방전펄스보다는 높은 전압레벨(즉, -350V 보다 높은 전압레벨; Ve)을 갖는 스텝(Step)파형을 가지게 되며, 방전셀에 축적된 공간전하를 제거하여 디케이 타임(t)을 줄이게 된다. 이에따라, 본 발명의 일실시예에 따른 PALC구동방법은 방전셀의 오방전을 방지함과 아울러, 라이팅에 의한 화질, 휘도 및 발광효율의 저하를 사전에 방지하여 PALC의 광효율 및 휘도를 향상시키게 된다. 또한, 본 발명의 일실시예에 따른 PALC구동방법은 음극라인 구동펄스를 이용하여 디케이 타임을 조절함으로써, 그레이 스케일(Grade Scale) 및 고휘도 화상을 구현하게 된다.Referring to FIG. 7, a cathode line driving pulse waveform diagram for describing a PALC driving method according to an exemplary embodiment of the present invention is illustrated. As shown in FIG. 7, the cathode line driving pulse includes a discharge pulse for generating a plasma discharge and an erase pulse for forcibly removing the space charge formed by the plasma discharge. You will have a waveform. At this time, the erase pulse has a step waveform having a higher voltage level than the discharge pulse (that is, a voltage level higher than −350 V; Ve), and removes the space charge accumulated in the discharge cell, thereby reducing the decay time (t). Will be reduced. Accordingly, the PALC driving method according to an embodiment of the present invention improves the light efficiency and luminance of the PALC by preventing erroneous discharge of the discharge cell and preventing degradation of image quality, brightness and luminous efficiency due to lighting in advance. . In addition, the PALC driving method according to an embodiment of the present invention implements a gray scale and a high luminance image by adjusting the decay time using a cathode line driving pulse.
도 8을 참조하면, 본 발명에 다른 실시예에 따른 PALC 구동방법을 설명하기 위한 음극라인 구동펄스 파형도가 도시되어 있다. 본 발명의 다른 실시예에 따른 PALC구동방법은 일실시예와 동일한 원리를 가지나 소정의 기울기로 증가하는 파형을 갖는 소거펄스를 사용하는 점이 구별된다. 이 경우, 소거펄스의 기울기를 조절함에 의해 공간전하의 양에 대응하도록 디케이 타임(t)을 조절할수 있게 된다. 이에따라, 본 발명의 다른 실시예에 따른 PALC구동방법은 방전셀의 오방전을 방지함과 아울러, 라이팅에 의한 화질, 휘도 및 발광효율의 저하를 사전에 방지하여 PALC의 광효율 및 휘도를 향상시키게 된다. 또한, 본 발명의 다른 실시예에 따른 PALC구동방법은 음극라인 구동펄스를 이용하여 디케이 타임을 조절함으로써, 그레이 스케일(Grade Scale) 및 고휘도 화상을 구현하게 된다.Referring to FIG. 8, a cathode line driving pulse waveform diagram for describing a PALC driving method according to another exemplary embodiment of the present invention is illustrated. The PALC driving method according to another embodiment of the present invention has the same principle as that of the embodiment, but distinguishes between using an erase pulse having a waveform which increases with a predetermined slope. In this case, the decay time t can be adjusted to correspond to the amount of space charge by adjusting the slope of the erase pulse. Accordingly, the PALC driving method according to another embodiment of the present invention improves the light efficiency and luminance of the PALC by preventing erroneous discharge of the discharge cells and preventing degradation of image quality, brightness and luminous efficiency due to lighting in advance. . In addition, the PALC driving method according to another embodiment of the present invention implements a gray scale and a high luminance image by adjusting the decay time using a cathode line driving pulse.
상술한 바와같이, 본 발명에 따른 플라즈마 어드레스 액정 표시장치의 구동방법은 방전셀의 오방전을 방지함과 아울러, 라이팅에 의한 화질, 휘도 및 발광효율의 저하를 사전에 방지하여 PALC의 광효율 및 휘도를 향상시킬수 있는 장점이 있다.As described above, the driving method of the plasma address liquid crystal display device according to the present invention prevents the discharging of the discharge cells and prevents the degradation of the image quality, brightness and luminous efficiency due to lighting, and thus the light efficiency and luminance of the PALC. There is an advantage to improve.
이상 설명한 내용을 통해 당업자 라면 본 발명의 기술사상을 일탈하지 아니하는 범위에서 다양한 변경 및 수정이 가능함을 알수 있을 것이다. 따라서, 본 발명의 기술적 범위는 명세서의 상세한 설명에 기재된 내용으로 한정되는 것이 아니라 특허 청구의 범위에 의해 정하여 져야만 할 것이다.Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019980050591A KR100301663B1 (en) | 1998-11-25 | 1998-11-25 | Operation Method of Plasma Address Liquid Crystal Display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019980050591A KR100301663B1 (en) | 1998-11-25 | 1998-11-25 | Operation Method of Plasma Address Liquid Crystal Display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20000033643A KR20000033643A (en) | 2000-06-15 |
| KR100301663B1 true KR100301663B1 (en) | 2001-10-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019980050591A KR100301663B1 (en) | 1998-11-25 | 1998-11-25 | Operation Method of Plasma Address Liquid Crystal Display |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR100301663B1 (en) |
-
1998
- 1998-11-25 KR KR1019980050591A patent/KR100301663B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR20000033643A (en) | 2000-06-15 |
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