KR100296786B1 - Driving Method of Plasma Address Liquid Crystal Display - Google Patents
Driving Method of Plasma Address Liquid Crystal Display Download PDFInfo
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- KR100296786B1 KR100296786B1 KR1019980046980A KR19980046980A KR100296786B1 KR 100296786 B1 KR100296786 B1 KR 100296786B1 KR 1019980046980 A KR1019980046980 A KR 1019980046980A KR 19980046980 A KR19980046980 A KR 19980046980A KR 100296786 B1 KR100296786 B1 KR 100296786B1
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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
- G09G3/22—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
- G09G3/30—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 electroluminescent panels
- G09G3/32—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 electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—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 electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—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 electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—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 electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
Abstract
본 발명은 크로스토크를 방지하는 플라즈마 어드레스 액정 표시장치 구동방법에 관한 것이다.The present invention relates to a plasma address liquid crystal display driving method for preventing crosstalk.
본 발명에 따른 플라즈마 어드레스 액정 표시장치 구동방법은 플라즈마부에 형성된 양극에 소정간격마다 극성이 변화되는 양극전압이 인가되는 단계와, 플라즈마부에 양극과 나란하게 형성된 음극에 양극전압의 변화에 대응하여 전압레벨이 가변되는 음극 전압이 인가되는 단계를 포함한다.In the method of driving a plasma address liquid crystal display according to the present invention, an anode voltage whose polarity is changed at predetermined intervals is applied to an anode formed in the plasma portion, and a cathode voltage formed in parallel with the anode in the plasma portion is changed in response to a change in anode voltage. And applying a negative voltage having a variable voltage level.
이에따라, 본 발명에 따라 플라즈마 어드레스 액정 표시장치 구동방법은 플라즈마 어드레스 액정 표시장치의 오방전 및 크로스토크를 방지하게 된다.Accordingly, the method of driving the plasma address liquid crystal display according to the present invention prevents mis-discharge and crosstalk of the plasma address liquid crystal display.
Description
본 발명은 평판 표시장치에 관한 것으로, 특히 크로스토그를 방지하는 플라즈마 어드레스 액정 표시장치 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 method of driving a plasma address liquid crystal display for preventing crosstalk.
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.
도1을 참조하면, 종래기술에 따른 PALC는 백라이트부(1O), 플라즈마부 및 액정부를 구비한다. PALC는 PDP와 같이 플라스마 방전을 이용하지만 방전조건에 있어서 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 것이 매우 중요하다. 이에 대한 상세한 설명은 후술하기로 한다.Referring to FIG. 1, a PALC according to the related art includes a backlight unit 10, a plasma unit, and a liquid crystal unit. PALC uses plasma discharge like PDP, but differs from PDP in terms of 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 제1편광판(22)과, 하부기판(24)의 상부에 나란하게 형성된 양극(A) 음극(K)과, 하부기판(24)의 상부에 수직으로 형성되어 각각의 방전채널을 분리하는 격벽(34)과, 격벽(34)의 상부에 형성된 절연막(36)을 구비한다. 하나의 방전채널에는 한쌍의 양극(A)과 음극(K)이 배치되어 있으며, He, Ne등의 방전가스가 채워져 있다. 상기 플라즈마부는 플라즈마 방전에 의해 형성된 가상전극을 이용하여 액정의 배열을 변화시키는 스위치소자의 역할을 수행하게 된다. 즉, 플라즈마는 LCD의 박막 트랜지스터(Thin Film Transistor : 이하 "TFT"라 한다.)와 동일한 스위치소자의 기능을 수행하게 된다. 한편, 액정모듈은 절연막(36)의 상부에 형성된 액정층(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 제2편광판(32)을 구비한다. 제1및 제2편관판(22,32)은 광빔의 수평 또는 수직 편광특성을 변화시키게 된다. 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)(28R), 녹색(Green; 이하 "G"라 한다)(28G) 및 청색(Blue;이하 "B"라 한다)(28B)의 칼타필터(28)가 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 includes a first polarizing plate 22 attached to the lower substrate 24 so as to face the backlight unit 10, an anode A and a cathode K formed side by side on the upper portion of the lower substrate 24, and a lower portion thereof. A barrier rib 34 is formed vertically on the substrate 24 to separate each discharge channel, and an insulating layer 36 is formed on the barrier rib 34. One discharge channel is provided with a pair of anodes A and K, and filled with discharge gases such as He and Ne. The plasma unit serves as a switch element for changing the arrangement of liquid crystals by using a virtual electrode formed by plasma discharge. That is, the plasma performs the same function as the switch element of the thin film transistor (hereinafter, referred to as TFT) of the LCD. Meanwhile, the liquid crystal module includes a liquid crystal layer 26 formed on the liquid crystal layer 36 formed on the insulating film 36, a transparent electrode (ITO) 38 formed on the liquid crystal layer 26, and a transparent electrode ( A color filter 28 formed on the upper portion of the upper surface 38, an upper substrate 30 formed on the upper portion of the color filter 28, and a second polarizing plate 32 attached to the upper substrate 30 are provided. The first and second polarizing plates 22 and 32 change the horizontal or vertical polarization characteristics of the light beam. 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, the upper portion of the transparent electrode 38 is referred to as red (Red) (hereinafter referred to as "R") 28R, green (hereinafter referred to as "G") (28G) and blue (hereinafter referred to as "B"). ), The calta filter 28 is formed to achieve the desired color.
한편, 도2를 결부하여 PALC의 동작원리에 대해서 상세히 살펴보기로 한다. 도2에 도시된바와같이 방전채널에 배치된 양극(A)에 OV, 음극(K)에 -350V를 인가하면 플라즈마 방전이 일어나게 된다. 이 경우, 방전채널의 내부에는 플라즈마 방전에 의해 형성된 하전입자(42)들에 의해 음극(k)의 주위를 제외하고는 양극전위를 가지게 된다. 이에 따라, 플라즈마 스위치(44)가 온(on)되어 양극(A)이 전기적으로 단락(Short)된 가상전극(Virtual Electrode;40)을 형성하게 된다. 즉, 플라방전이 일어나는 경우 가상전극(40)이 형성되어 양극(A)에 대해서 단락(Short)된Meanwhile, the operation principle of the PALC will be described in detail with reference to FIG. 2. As shown in FIG. 2, when OV and -350V are applied to the anode A disposed in the discharge channel, plasma discharge occurs. In this case, inside the discharge channel, the charged particles 42 formed by plasma discharge have the anode potential except for the periphery of the cathode k. Accordingly, the plasma switch 44 is turned on to form a virtual electrode 40 in which the anode A is electrically shorted. That is, in the case of a flame discharge, the virtual electrode 40 is formed and shorted with respect to the anode A.
상태를 가지게 된다. 반면에, 플라즈마 방전이 종료된 경우 플라즈마 스위치(44)는You have a state. On the other hand, when the plasma discharge is finished, the plasma switch 44
오프(0ff)되어 가상전극(40)이 형성되지 않으므로 양극에 대해서 개방(Open)된 상태를 가지게 된다. 또한, 방전기간중(즉, 가상전극(40)이 형성된 경우) 투명전극(38)에 영상신호가 인가되면, 절연층(36)과 액정층(26)의 용량분압비에 의한 전위차가 액정층(26)에 발생하여 액정의 배열구조를 변화시켜 광빔의 투과량을 조절하게 된다. 이와 같이, 방전채널 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 종료된 비선택기간에도 방전채널에는 그 상태가 유지되므로 액정의 상태를 메모리하는 것이 가능하게 된다. 이에따라, PALC는 플라즈마 방전에 의해 형성된 가상전극(40)을 이용하여 액정의 배열을 변화시켜 영상신호에 대응하는 화면을 표시하게 된다. 한편, 액정은 자발광 소자가 아니므로 외부의 광을 공급하기 위해 백라이트부(10)를 사용하게 된다. 이때, 백라이트부(10)에서 광빔이 조사될 때 전극의 위치 및 방전채널의 구조에 의해 광효율 또는 휘도가 달라지게 된다.Since the virtual electrode 40 is not formed because it is turned off (0ff), it is in an open state with respect 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 40 is formed), the potential difference due to the capacitance partial pressure ratio of the insulating layer 36 and the liquid crystal layer 26 becomes the liquid crystal layer. It occurs at 26 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 channel performs a switching operation, and as a result, controls 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 channel even in the non-selection period after the discharge is completed, 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. On the other hand, since the liquid crystal is not a self-luminous element, the backlight unit 10 is used to supply external light. At this time, when the light beam is irradiated from the backlight unit 10, the light efficiency or luminance is changed by the position of the electrode and the structure of the discharge channel.
도 4를 참조하면, 종래기술에 따른 PALC 구동방법을 설명하기 위한 도면이Referring to Figure 4, a view for explaining a PALC driving method according to the prior art
도시되어 있다. 도 3에 도시된 바와같이 하부기판(24)의 상부에 수직으로 형성된Is shown. As shown in FIG. 3, the upper portion of the lower substrate 24 is vertically formed.
제1 내지 제n 격벽(34a 내지 34n)들 사이에는 다수개의 방전채널들이 마련되어 있다. 상기 방전채널에는 한쌍의 전극(즉, 음극(K)과 양극(A))이 배치되어 있다. 이러한 전극구조를 갖는 PALC의 구동방법에 대해서 설명하기로 한다.A plurality of discharge channels are provided between the first to n-th partition walls 34a to 34n. A pair of electrodes (that is, the cathode K and the anode A) is disposed in the discharge channel. A method of driving a PALC having such an electrode structure will be described.
도4에 도시된 바와같이 양극(A)은 기저전압원(GND)에 공통 접속되어 OV의 전위를 가지게 된다. 음극(K)에는 소정의 전압레벨을 갖는 구동전압(예를들면, -350V)을 인가하면 방전채널에 플라즈마 방전이 일어나게 된다. 이에따라, 방전채널에서는 플라즈마 방전에 의한 스위칭 동작에 의해 액정층(26)에 전압이 충전되어 질 준비가 된다. 이어서, 계조 제어전압이 인가되면 액정층(26)에는 절연막(36)과As shown in FIG. 4, the anode A is commonly connected to the ground voltage source GND to have a potential of OV. When a driving voltage (for example, -350 V) having a predetermined voltage level is applied to the cathode K, plasma discharge occurs in the discharge channel. Accordingly, in the discharge channel, the liquid crystal layer 26 is ready to be charged by the switching operation by plasma discharge. Subsequently, when the gray scale control voltage is applied, the liquid crystal layer 26 may have an insulating film 36.
액정층(26)의 용량분압비에 따른 계조 제어전압이 인가되어 계조를 구현하게 된다.The gray scale control voltage according to the capacitance partial ratio of the liquid crystal layer 26 is applied to implement gray scale.
이 경우, 액정층(26)의 열화를 방지하기 위해 스캔 라인별 또는 매 프레임별로 계In this case, in order to prevent deterioration of the liquid crystal layer 26, the scan lines or frames are framed.
조 제어전압의 위상을 반대로 공급하는 것이 바람직하다.It is preferable to reverse the phase of the bath control voltage.
그러나, 플라즈마 방전시 직류(DC)방전이 형성되어 방전채널에 과다한 공간전하가 누적되어 오동작을 야기시킨다. 또한, 방전시 방전채널의 일측에만 대부분의 공간전하가 분포된 후 디케이(Decay) 되는 시간이 길어져 인접한 스캔라인간의 전하량이 달라져서 크로스토크(Crosstalk)를 발생하게 된다. 이에 대해서 상세히 설명하기로 한다. 예를들어, 제n음극라인(Kn)에서 방전이 일어난후 음의 전압레벨을 갖는 계조 제어전압을 라이팅하여 제n 음극라인의 제조를 구현하게 된다. 이후, 액정층(26)은 현재의 상태를 유지하게 된다. 이어서, 소정의 시간(즉, 1수직동기시간)후, 제n+1 음극라인(Kn+1)에서도 동일한 방법에 의해 화상을 표시하게 된다. 이때, 방전채널에 누적된 공간전하로 인해 디케이 타임(Decay Time)이 길어져 제n 음극라인(Kn)의 계조 제어전압의 라이팅이 완료되기전에 제n+1 음극라인(Kn+1)의 플라즈마 방전이 일어날 경우 다른 라인의 계조 제어전압이 라이팅 되거나 오방전되어 인접 방전채널간에 크로스토크가 발생되는 문제점이 도출되고 있다.However, a direct current (DC) discharge is formed during plasma discharge, causing excessive space charge to accumulate in the discharge channel, causing malfunction. In addition, since most space charges are distributed only on one side of the discharge channel during discharge, the decay time is long, and thus the amount of charge between adjacent scan lines is changed to generate crosstalk. This will be described in detail. For example, after the discharge occurs in the nth negative electrode line Kn, the gray level control voltage having a negative voltage level is written to implement the manufacture of the nth negative electrode line. Thereafter, the liquid crystal layer 26 maintains its current state. Subsequently, after a predetermined time (that is, one vertical synchronous time), the image is displayed by the same method even in the n + 1th cathode line Kn + 1. At this time, the decay time becomes longer due to the space charge accumulated in the discharge channel, and the plasma discharge of the n + 1 cathode line Kn + 1 is completed before the gray level control voltage of the nth cathode line Kn is completed. In this case, there is a problem that crosstalk is generated between adjacent discharge channels due to the gray-level control voltage of another line being written or mis-discharged.
따라서, 본 발명의 목적은 크로스토크를 방지하는 플라즈마 어드레스 액정표시장치 구동방법을 제공 하는데 있다.Accordingly, an object of the present invention is to provide a plasma address liquid crystal display driving method for preventing crosstalk.
도1은 종래의 기술에 따른 PALC의 구조를 도시한 사시도.1 is a perspective view showing the structure of a PALC according to the prior art.
도2는 PALC의 동작원리를 설명하기 위해 도시한 도면.2 is a view for explaining the operation principle of PALC.
도3은 도1의 전극구성을 도시한 도면.3 is a view showing the electrode configuration of FIG.
도4는 도1의 구동방법을 설명하기 위해 도시한 도면.4 is a view for explaining the driving method of FIG.
도5는 본 발명에 따른 PALC의 양극 및 음극에 인가되는 구동전압의 파형을 도시한 파형도.5 is a waveform diagram showing waveforms of driving voltages applied to the anode and cathode of the PALC according to the present invention;
도6은 본 발명에 따른 PALC의 계조를 구현하기 위한 계조신호의 파형을 도시한 파형도.6 is a waveform diagram showing waveforms of a gradation signal for implementing gradation of a PALC according to the present invention;
* 도면의 주요 부분에 대한 부호의 간단한 설명* Brief description of symbols for the main parts of the drawing
10 : 백라이트부 22,32 : 편광필터10: backlight 22, 32: polarization filter
24 : 하부기판 26 : 액정24: lower substrate 26: liquid crystal
28 : 칼라필터 30 : 상부기판28: color filter 30: upper substrate
34 : 격벽 36 : 절연막34: partition 36: insulating film
38 : 투명전극 40 : 가상전극38: transparent electrode 40: virtual electrode
42 : 하전입자 41 : 플라즈마 스위치42: charged particle 41: plasma switch
상기 목적을 달성하기 위하여 본 발명에 따른 플라즈마 어드레스 액정 표시장치 구동방법은 플라즈마부에 형성된 양극에 소정간격마다 극성이 변화되는 양극전압이 인가되는 단계와, 플라즈마부에 양극과 나란하게 형성된 음극에 양극전압의In order to achieve the above object, a method of driving a plasma address liquid crystal display according to the present invention includes applying an anode voltage whose polarity is changed at a predetermined interval to an anode formed in a plasma portion, and an anode formed on a cathode formed parallel to the anode in the plasma portion. Voltage
변화에 대응하여 전압레벨이 가변되는 음극 전압이 인가되는 단계를 포함한다.And applying a negative voltage having a variable voltage level in response to the change.
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.
도5 내지 도6을 참조하여 본 발명의 바람직한 실시예에 대하여 설명하기로 한다.5 to 6 will be described a preferred embodiment of the present invention.
도5를 참조하면, 본 발명에 따른 플라즈마 어드레스 액정 표시장치 구동방법을 설명하기 위한 도면이 도시되어 있다.5, there is shown a diagram for explaining a method of driving a plasma address liquid crystal display according to the present invention.
라인 또는 프레임마다 서로다른 극성을 갖는 양극 전압을 인가한다. 양극전압은 스캔라인별 또는 매 프레임별로 서로 반대의 위상을 갖는 전압이 인가된다. 이에따라, 방전채널을 인가하게 된다. 또한, 앙극 전압의 변화에 대응하여 일정한 구동전압 레벨을 유지하도록 변화되는 음극 전압을 인가한다. 음극 전압은 양극전압의 변화에 대응하여 자신의 전압레벨을 가변시키게 된다. 예를들어 설명하면, 양극 전압이 높은 레벨일 경우 음극 전압은 낮은 레벨을 가지게 된다. 반면에, 양극 전압이 낮은 레벨일 경우 음극 전압은 높은 레벨을 가지게 된다. 또한 음극 전압레벨에 따라 방전채널에 형성되는 공간전하의 양이 결정된다. 이에따라, 양극과 음극전압이 일정한 구동전압 레벨을 유지함에 의해 방전채널에는 균등한 공간전하가 형성되어 공간전하의 디케이 타임이 줄어들게 되므로 오방전 및 크로스토크를 방지하게 된다.A positive voltage with different polarities is applied to each line or frame. The anode voltage is applied with voltages having opposite phases to each other for each scan line or every frame. Accordingly, the discharge channel is applied. In addition, a cathode voltage that is changed to maintain a constant driving voltage level in response to the change of the anode voltage is applied. The negative voltage changes its voltage level in response to the change in the positive voltage. For example, when the positive voltage is at a high level, the negative voltage has a low level. On the other hand, when the anode voltage is at a low level, the cathode voltage has a high level. In addition, the amount of space charge formed in the discharge channel is determined by the cathode voltage level. Accordingly, since the positive and negative voltages maintain a constant driving voltage level, even space charges are formed in the discharge channel, thereby reducing the decay time of the space charges, thereby preventing mis-discharge and crosstalk.
또한, 도6에 도시된바와같이 계조 제어전압은 일정한 전압레벨을 유지하게된다. 상기 계조 제어전압과 양극전압의 전위차에 의해 액정층의 투과량을 조절하여 화상을 구현하게 된다. 이 경우, 계조 제어전압은 양극전압을 기준레벨로하며,상기 양극전압 레벨에서 소정의 높이를 갖는 단일극성의 파형을 가지게 된다. 또한, 양극전압이 라인 또는 프레임 마다 서로다른 극성의 펄스가 인가되므로 액정의 열화를 방지하게 된다. 이때, 음극전압 및 양극전압은 도5에 도시된바와같이 일정한 전압레벨을 유지하도록 가변되어진다.Also, as shown in FIG. 6, the gray scale control voltage maintains a constant voltage level. The transmission amount of the liquid crystal layer is controlled by the potential difference between the gray scale control voltage and the anode voltage to implement an image. In this case, the gray scale control voltage has a positive voltage as a reference level, and has a monopolar waveform having a predetermined height at the positive voltage level. In addition, since the anode voltage is applied with a pulse of different polarity for each line or frame, deterioration of the liquid crystal is prevented. At this time, the cathode voltage and the anode voltage are varied to maintain a constant voltage level as shown in FIG.
상술한 바와같이, 본 발명에 따른 플라즈마 어드레스 액정 표시장치 구동방법은 방전채널에 균등한 공간전하를 형성시켜 오방전 및 크로스토크를 방지할 수 있는 장점이 있다.As described above, the method of driving the plasma address liquid crystal display according to the present invention has the advantage of preventing an error discharge and crosstalk by forming an equal space charge in the discharge channel.
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.
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