KR20000032930A - Plasma address liquid crystal display and drive method of the same - Google Patents
Plasma address liquid crystal display and drive method of the same Download PDFInfo
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- KR20000032930A KR20000032930A KR1019980049567A KR19980049567A KR20000032930A KR 20000032930 A KR20000032930 A KR 20000032930A KR 1019980049567 A KR1019980049567 A KR 1019980049567A KR 19980049567 A KR19980049567 A KR 19980049567A KR 20000032930 A KR20000032930 A KR 20000032930A
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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
- G09G3/28—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
- G09G3/2935—Addressed by erasing selected cells that are in an ON state
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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
Description
본 발명은 평판 표시장치에 관한 것으로, 특히 휘도 및 광효율을 향상시키도록 구성된 고휘도 플라즈마 어드레스 액정 표시장치 및 그 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 high brightness plasma address liquid crystal display and a driving method thereof configured to improve 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 것이 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 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 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 수평 또는 수직 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 칼라필터(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 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 barrier rib 34 is formed vertically on the lower substrate 4 to separate respective discharge channels, and an insulating layer 36 is formed on the barrier rib 34. In one discharge channel, a pair of anodes (A) and cathodes (K) are arranged 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 horizontal or vertical 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 28 of red (hereinafter referred to as "R"), green (hereinafter referred to as "G"), and blue (hereinafter referred to as "B") is disposed on the transparent electrode 38. ) Is formed to achieve the desired color.
한편, 도 2를 결부하여 PALC의 동작원리에 대해서 상세히 살펴보기로 한다. 도 2에 도시된바와같이 방전채널에 배치된 양극(A)에 0V, 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. 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 양극(A)에 대해서 단락(Short)된 상태를 가지게 된다. 반면에, 플라즈마 방전이 종료된 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(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 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 channel and −350 V is applied to the cathode K, 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, when plasma discharge occurs, the virtual electrode 40 is formed to have a short state with respect to the anode A. FIG. On the other hand, when the plasma discharge is completed, 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 26 is changed to the liquid crystal layer 26. 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 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.
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. 이하, 도 3을 결부하여 종래기술에 따른 PALC의 전극구조에 대해서 살펴보기로 한다.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. Hereinafter, the electrode structure of the PALC according to the prior art will be described with reference to FIG. 3.
도 3을 참조하면, 종래기술에 따른 PALC의 전극구조가 도시되어 있다. 하부기판(24)의 상부에 수직으로 형성된 제1 내지 제n 격벽(34a 내지 34n)들 사이에는 다수개의 방전채널들이 마련되어 있다. 상기 방전채널에는 한쌍의 음극(K)과 양극(A)이 배치되어 있다. 이 경우, 음극(K)과 양극(A)은 하부기판(24)의 상부에 배치되어 있으므로 음극(K) 및 양극(A)이 마련된 부분을 투과하는 광빔은 차단된다. 이에따라, PALC의 광효율 및 휘도 레벨을 저하시키는 문제점이 도출되고 있다. 또한, 격벽(34) 내에 배치된 음극(K) 및 양극(A)의 간격이 인접하는 방전채널과 동일하도록 구성되어 있어 플라즈마 방전시 인접한 셀이 오방전 또는 크로스토크를 유발하는 문제점이 도출되고 있다.3, there is shown an electrode structure of a PALC according to the prior art. A plurality of discharge channels are provided between the first to n-th partition walls 34a to 34n formed vertically on the lower substrate 24. A pair of cathodes K and anodes A are disposed in the discharge channel. In this case, since the cathode K and the anode A are disposed above the lower substrate 24, the light beams passing through portions provided with the cathode K and the anode A are blocked. Accordingly, a problem of lowering the light efficiency and luminance level of the PALC has been derived. In addition, since the gap between the cathode K and the anode A disposed in the barrier rib 34 is the same as the adjacent discharge channel, a problem in which adjacent cells cause mis-discharge or crosstalk during plasma discharge has been derived. .
따라서, 본 발명의 목적은 휘도 및 광효율을 향상시키도록 구성된 고휘도 플라즈마 어드레스 액정 표시장치 및 그 구동방법을 제공 하는데 있다.Accordingly, an object of the present invention is to provide a high brightness plasma address liquid crystal display and a driving method thereof configured to improve brightness and light efficiency.
도 1은 종래의 기술에 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 도 1의 전극구성을 도시한 도면.3 is a view showing the electrode configuration of FIG.
도 4는 본 발명에 따른 PALC의 구조를 도시한 도면.4 illustrates the structure of a PALC according to the present invention.
도 5는 도 4의 전극구성을 도시한 도면.5 is a view showing the electrode configuration of FIG.
도 6은 본 발명의 일실시예에 따른 PALC 구동방법을 설명하기 위해 도시한 도면.6 is a view illustrating a PALC driving method according to an embodiment of the present invention.
도 7은 본 발명의 다른 실시예에 따른 PALC 구동방법을 설명하기 위해 도시한 도면.7 is a view for explaining a PALC driving method according to another embodiment of the present invention.
＜ 도면의 주요 부분에 대한 부호의 설명 ＞<Description of the code | symbol about the principal part of drawing>
10,70 : 백라이트부 22,32,52,62 : 편광필터10,70: backlight 22,32,52,62: polarization filter
24,54 : 하부기판 26,56 : 액정24,54: lower substrate 26,56: liquid crystal
28,58 : 칼라필터 30,60 : 상부기판28,58: color filter 30,60: upper substrate
34,64 : 격벽 36,66 : 절연막34,64 bulkhead 36,66 insulating film
38,68 : 투명전극 40 : 가상전극38,68 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 표시장치는 플라즈마부를 각각의 방전채널로 분할하는 격벽과, 격벽의 하부에 형성된 전극을 구비한다.In order to achieve the above object, the plasma address liquid crystal display according to the present invention includes a partition wall that divides the plasma unit into respective discharge channels, and an electrode formed under the partition wall.
또한, 본 발명에 따른 플라즈마 어드레스 액정 표시장치의 구동방법은 제1 내지 제n 전극이 매 수평주기 마다 반대의 극성을 갖도록 상기 제1 내지 제n 전극에 순차적으로 구동전압을 인가한다.In addition, the driving method of the plasma address liquid crystal display according to the present invention sequentially applies a driving voltage to the first to n-th electrodes such that the first to n-th electrodes have opposite polarities every horizontal period.
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 4 내지 도 6을 참조하여 본 발명의 바람직한 실시예에 대하여 설명 하기로 한다.A preferred embodiment of the present invention will be described with reference to FIGS. 4 to 6.
도 4를 참조하면, 본 발명에 따른 플라즈마 어드레스 액정 표시장치가 도시되어있다. 본 발명에 따른 PALC는 백라이트부, 플라즈마부 및 액정부를 구비한다. 상기 백라이트부 및 액정부의 기능 및 동작은 도 1 및 도 2에서 충분히 기술되었으므로 상세한 설명은 생략하기로 한다. 한편, 플라즈마부는 백라이트부(70)에 대향되도록 하부기판(54)에 부착된 제1 편광판(52)과, 하부기판(54)의 상부에 수직으로 형성된 격벽(64)과, 격벽(64)의 하부에 형성된 전극(E)과, 격벽(64)의 상부에 형성된 절연막(56)을 구비한다. 종래 PALC의 플라즈마부에는 하나의 방전채널에 1개의 양극(A)과 1개의 음극(K)이 마련된 것에 비해 본 발명에 따른 PALC의 플라즈마부는 하나의 방전채널에 1개의 전극(E)이 마련되어 있다. 또한, 하나의 방전채널을 구분하기 위해 인접하게 형성된 제1 및 제2 격벽(64a,64b)의 하부에 마련된 제1 및 제2 전극(E1,E2) 사이에 전위차가 발생되면 플라즈마 방전을 일으키게 된다. 이 경우, 하나의 방전채널에 인접한 일측 전극(예를들면, 제1 전극)은 양극으로 사용되고 타측 전극(예를들면, 제2 전극)은 음극으로 사용된다. 즉, 하나의 방전채널에 하나의 전극(E)이 마련되어 하나의 스캔라인에 대응하게 된다. 이에따라, 본 발명에 따른 PALC의 플라즈마부는 하나의 방전채널에 1개의 전극만을 필요로 하므로 종래의 PALC 플라즈마부에 비해 전극의 수를 감소시켜 광효율 및 휘도가 향상된다.4, a plasma address liquid crystal display according to the present invention is shown. PALC according to the present invention includes a backlight unit, a plasma unit and a liquid crystal unit. Since the functions and operations of the backlight unit and the liquid crystal unit are sufficiently described in FIGS. 1 and 2, detailed descriptions thereof will be omitted. On the other hand, the plasma portion of the first polarizing plate 52 attached to the lower substrate 54 so as to face the backlight unit 70, the partition 64 formed perpendicular to the upper portion of the lower substrate 54, and the partition 64 The electrode E formed in the lower part and the insulating film 56 formed in the upper part of the partition 64 are provided. The plasma part of the conventional PALC is provided with one anode (A) and one cathode (K) in one discharge channel, whereas the plasma part of the PALC according to the present invention is provided with one electrode (E) in one discharge channel. . In addition, when a potential difference is generated between the first and second electrodes E1 and E2 provided under the adjacent first and second partitions 64a and 64b to distinguish one discharge channel, plasma discharge is caused. . In this case, one electrode (eg, the first electrode) adjacent to one discharge channel is used as the anode and the other electrode (eg, the second electrode) is used as the cathode. That is, one electrode E is provided in one discharge channel to correspond to one scan line. Accordingly, since the plasma portion of the PALC according to the present invention requires only one electrode in one discharge channel, the number of electrodes is reduced compared to the conventional PALC plasma portion, thereby improving light efficiency and luminance.
도 6 및 도 7을 참조하면, 본 발명의 실시예에 따른 PALC 구동방법을 설명하기위한 도면이 도시되어 있다. 본 발명에 따른 PALC를 구동하기 위해 도 5에 도시된바와같은 제1 내지 제n 전극(E1 내지 En)이 매 수평주기마다 반대의 극성을 갖도록 구동전압을 순차적으로 인가하게 된다. 예를들어 설명하면, 제1 수평주기(t1)동안 제1 및 제2 전극(E1,E2) 사이에 구동전압이 인가되면 제1 및 제2 전극사이에 전위차가 발생하여 방전채널에서는 플라즈마 방전이 일어난다. 이 경우, 제1 전극(E1)에는 양의 전압레벨을 갖는 펄스가 인가되고 제2 전극(E2)에는 음의 전압레벨을 갖는 펄스가 인가된다. 이어서, 제2 수평주기(t2)동안 제2 전극(E2)에는 양의 전압레벨을 갖는 펄스가 인가되고 제3 전극(E3)에는 음의 전압레벨을 갖는 펄스가 인가되어 플라즈마 방전을 일으키게 된다. 이와 동일한 방법으로 제n 수평주기(tn)까지 구동전압을 순차적으로 인가하면 한 프레임에 대응하는 화면을 구현하게 된다. 또한, 매 수평주기마다 하나의 전극의 극성은 양극(+)에서 음극(-)으로 자동적으로 반전 되므로 방전채널에 축적되는 공간전하가 감소되어 PALC의 고속 구동이 용이하게 된다.6 and 7, a diagram illustrating a PALC driving method according to an embodiment of the present invention is shown. In order to drive the PALC according to the present invention, driving voltages are sequentially applied such that the first to n th electrodes E1 to En as shown in FIG. 5 have opposite polarities every horizontal period. For example, when a driving voltage is applied between the first and second electrodes E1 and E2 during the first horizontal period t1, a potential difference is generated between the first and second electrodes, so that plasma discharge is performed in the discharge channel. Happens. In this case, a pulse having a positive voltage level is applied to the first electrode E1 and a pulse having a negative voltage level is applied to the second electrode E2. Subsequently, a pulse having a positive voltage level is applied to the second electrode E2 during the second horizontal period t2, and a pulse having a negative voltage level is applied to the third electrode E3 to cause plasma discharge. In the same way, when the driving voltage is sequentially applied to the nth horizontal period tn, a screen corresponding to one frame is realized. In addition, the polarity of one electrode is automatically inverted from the positive electrode (+) to the negative electrode (−) every horizontal period, so that the space charge accumulated in the discharge channel is reduced, thereby facilitating the fast drive of the PALC.
또한, 도 6에 도시된바와같이 전극(E)들에 인가되는 구동전압은 한 수평주기 동안 음의 전압레벨을 갖는 펄스에 소정의 수평주기동안 계단형태의 양의 전압레벨을 갖는 펄스가 부가된다. 이 경우, 양의 펄스는 기준전위에서 계단형태로 소정레벨씩 감소된다. 이에따라, 계조 제어전압의 레벨을 낮게 설정할수 있으므로 방전채널의 오동작 및 크로스토크를 방지하게 된다.In addition, as shown in FIG. 6, the driving voltage applied to the electrodes E is added to a pulse having a negative voltage level for one horizontal period and a pulse having a positive voltage level in a stepped shape for a predetermined horizontal period. . In this case, the positive pulse is reduced by a predetermined level in the form of steps at the reference potential. Accordingly, the level of the gradation control voltage can be set low, thereby preventing malfunction of the discharge channel and crosstalk.
한편, 도 7에 도시된바와같이 전극(E)들에 인가되는 구동전압은 한 수평주기동안 음의 전압레벨을 갖는 펄스에 한 수평주기동안 양의 전압레벨을 갖는 펄스가 부가된다. 이 경우, 각 방전채널에서는 균등한 플라즈마 방전을 일으켜 크로스토크를 방지하게 된다.On the other hand, as shown in Figure 7, the driving voltage applied to the electrodes (E) is added to a pulse having a positive voltage level for one horizontal period to a pulse having a negative voltage level for one horizontal period. In this case, an equal plasma discharge is generated in each discharge channel to prevent crosstalk.
상술한 바와같이, 본 발명에 따른 고휘도 플라즈마 어드레스 액정 표시장치는 전극의 수를 감소시켜 광효율 및 휘도를 향상시킬수 있는 장점이 있다.As described above, the high brightness plasma address liquid crystal display according to the present invention has an advantage of improving the light efficiency and brightness by reducing the number of electrodes.
또한, 본 발명에 따른 고휘도 플라즈마 어드레스 액정 표시장치 구동방법은 매 수평주기마다 하나의 전극 극성이 반전되도록 구동전압을 인가하여 크로스토크를 방지함과 아울러, 고속 구동시킬수 있는 장점이 있다.In addition, the method of driving the high brightness plasma address liquid crystal display according to the present invention has the advantage of preventing the crosstalk by applying a driving voltage such that one electrode polarity is inverted every horizontal period and driving the high speed.
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 (6)
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| KR1019980049567A KR20000032930A (en) | 1998-11-18 | 1998-11-18 | Plasma address liquid crystal display and drive method of the same |
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| KR1019980049567A KR20000032930A (en) | 1998-11-18 | 1998-11-18 | Plasma address liquid crystal display and drive method of the same |
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