KR20070011014A - Method for driving organic electrolumineascence - Google Patents

Method for driving organic electrolumineascence Download PDF

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KR20070011014A
KR20070011014A KR1020050066064A KR20050066064A KR20070011014A KR 20070011014 A KR20070011014 A KR 20070011014A KR 1020050066064 A KR1020050066064 A KR 1020050066064A KR 20050066064 A KR20050066064 A KR 20050066064A KR 20070011014 A KR20070011014 A KR 20070011014A
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data
driving
organic
scan
lines
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KR1020050066064A
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Korean (ko)
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김정근
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주식회사 대우일렉트로닉스
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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]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3283—Details of drivers for data electrodes in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements
    • 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
    • G09G2320/0238—Improving the black level
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/08—Fault-tolerant or redundant circuits, or circuits in which repair of defects is prepared

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

A method for driving an organic electro-luminescent device is provided to remove a stripe from a displayed image by setting each data line output, from a floating state to a ground state in displaying a black pattern. When a black pattern is displayed, vertical driving switches(S21~S2m) of a data driver(20) are set to a ground state, so that driving currents from respective data lines(D1~Dm) are controlled, horizontal driving switches(S11~S1n) of a scan driver(10) are set to the ground state and driving data is inputted. Then, the driving data is sensed, and the corresponding vertical driving switch of the data driver is set to the ground state, so that a driving voltage is set to 0V and a stripe is removed from a displayed image.

Description

유기 ＥＬ 구동 방법{Method for driving Organic electrolumineascence}Organic EL driving method {Method for driving Organic electrolumineascence}

도 1 은 일반적인 유기 EL 표시장치의 구동 회로도.1 is a driving circuit diagram of a general organic EL display device.

도 2 는 도 1 의 R,G,B 서브픽셀의 구성을 나타낸 도면.FIG. 2 is a diagram illustrating a configuration of R, G, and B subpixels of FIG. 1. FIG.

도 3 은 본 발명에 따른 유기 EL 표시장치의 구동 방법을 나타낸 구동 회로도.3 is a drive circuit diagram showing a driving method of an organic EL display device according to the present invention;

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

10 : 스캔 구동부 20 : 데이터 구동부10: scan driver 20: data driver

30 : 패널 40 : 픽셀30: panel 40: pixel

S11~S1n : 수평 구동 절환 스위치 S11 ~ S1n: Horizontal Drive Switch

S21~s2m : 수직 구동 절환 스우치S21 ~ s2m: Vertical Drive Switching Souch

S1~Sn : 스캔 라인 D1~Dm : 데이터 라인S1 ~ Sn: Scan Line D1 ~ Dm: Data Line

본 발명은 유기 EL 구동 방법에 관한 것으로서, 더욱 상세하게는 블랙 패턴을 디스플레이시 각 데이터 라인 출력을 플로우팅 상태에서 접지로 설정하여 픽셀 결함으로 인해 발생되는 휘선을 제거할 수 있도록 한 유기 이엘 구동 방법에 관한 것이다. The present invention relates to an organic EL driving method, and more particularly, an organic EL driving method capable of removing bright lines caused by pixel defects by setting each data line output to a ground in a floating state when displaying a black pattern. It is about.

현재 사용되고 있는 화상표시소자로는 음극선관(CRT)과 평판 표시소자인 액정표시소자(LCD), 플라즈마 디스플레이 패널(PDP), 유기 이엘(Organic electrolumineascencee) 등이 있다. Currently used image display devices include a cathode ray tube (CRT) and a flat panel display (LCD), a plasma display panel (PDP), and an organic EL (Organic electroluminea scencee).

이중 음극선관은 화질 및 밝기의 측면에서 다른 소자에 비해 월등히 우수한 성능을 갖고 있으나, 부피가 크고 무겁기 때문에 대형 스크린을 필요로 하는 용도로는 적합하지 않다는 단점이 있다. The double cathode ray tube has superior performance compared to other devices in terms of image quality and brightness, but has a disadvantage in that it is not suitable for applications requiring a large screen because it is bulky and heavy.

반면에, 평판 표시소자는 음극선관에 비해 부피와 무게가 매우 작다는 장점이 있어 그 용도가 점차로 확대되고 있는 추세이며, 차세대용 표시소자로서 그에 대한 연구가 활발하게 진행되고 있다. On the other hand, the flat panel display device has an advantage that the volume and weight is very small compared to the cathode ray tube, and its use is gradually increasing, and research on the display device as a next generation display device is being actively conducted.

특히, 유기 EL은 외부전기장이 형광성 유기 발광물질에 인가되면 유기물 내에서 전자와 홀이 결합하여 빛을 내는 자체발광 현상을 이용한 평판 디스플레이로서, 마주보는 상판 글라스와 하판 글라스의 세로 전극패턴과 가로 전극패턴 사이의 구성 교차점에서 전기장이 유기 발광물질에 인가됨에 따라 발광하여 갖가지 문자나 패턴을 표시하게 된다. In particular, the organic EL is a flat panel display using a self-luminous phenomenon in which electrons and holes are combined to emit light when an external electric field is applied to the fluorescent organic light emitting material. As the electric field is applied to the organic light emitting material at the constituent intersection point between the patterns, various characters or patterns are displayed.

또한, 유기 EL 디스플레이는 고품위 패널 특성인 저전력, 고휘도, 고반응속도, 저중량을 나타내고 있어, 이동통신단말기나 PDA, 캠코더, 팜PC(Palm PC) 등의 휴대장치의 디스플레이로 각광받고 있다.In addition, organic EL displays exhibit high power panel characteristics such as low power, high brightness, high response speed, and low weight, and are therefore attracting attention as displays of mobile communication terminals, portable devices such as PDAs, camcorders, Palm PCs, and the like.

도 1 에 도시된 바와 같은 유기 EL 표시장치는 크게 다수의 스캔라인(S1~Sn)들 중 어느 하나에 스캔 신호를 공급함으로써 스캔라인을 선택하는 스캔 구동부(10)와, 스캔 라인(S1~Sn)들과 교차하는 다수의 데이터라인(D1~Dm)들에 정전압을 공급하기 위한 데이터 구동부(20)로 구성되어 있다. As shown in FIG. 1, the organic EL display device includes a scan driver 10 which selects a scan line by supplying a scan signal to one of a plurality of scan lines S1 to Sn, and a scan line S1 to Sn. The data driver 20 is configured to supply a constant voltage to the plurality of data lines D1 to Dm that intersect the plurality of data lines.

여기서, 도면부호(30)는 패널이고, 도면부호(40)은 픽셀이다. Here, reference numeral 30 is a panel, and reference numeral 40 is a pixel.

이러한, 유기 EL 표시장치는 스캔 라인들(S1~Sn)과 데이터 라인들(D1~Dm)이 매트릭스 형태로 배열되고, 매트릭스 형태로 배열된 스캔 라인들(S1~Sn)과 데이터 라인들(D1~Dm) 각각에 일단이 연결된 다이오드 형태의 유기 EL 소자(OLED)가 연결되어 있다. 그리고, 유기 EL 소자(OLED)의 양극은 데이터 라인들(D1~Dm)에 연결되어 있고, 음극은 스캔 라인들(S1~Sn)에 연결되어 있다. In the organic EL display, scan lines S1 to Sn and data lines D1 to Dm are arranged in a matrix, and scan lines S1 to Sn and data lines D1 are arranged in a matrix. Dm) is connected to an organic EL device (OLED) in the form of a diode having one end connected to each. The anode of the organic EL element OLED is connected to the data lines D1 to Dm, and the cathode is connected to the scan lines S1 to Sn.

스캔 구동부(10)는 n개의 스캔 라인들(S1~Sn)에 순차적으로 스캔신호를 공급함으로써 화상을 디스플레이하기 위한 스캔라인(S1~Sn)을 선택한다. 데이터 구동부(20)는 해당 스캔 라인에 m비트의 데이터를 입력하여 m개의 데이터 라인들(D1~Dn)로 데이터를 출력한다. The scan driver 10 selects scan lines S1 to Sn for displaying an image by sequentially supplying scan signals to the n scan lines S1 to Sn. The data driver 20 inputs m bits of data into the corresponding scan line and outputs data to the m data lines D1 to Dn.

그리고, 유기 이엘 소자(OLED)는 발광 다이오드의 동작과 유사하게 스캔 라인에 "로우" 레벨의 전압이 인가되고, 데이터 라인에는 유기 이엘 소자의 순방향 전압 이상의 전압이 인가되면 발광한다. Similar to the operation of the light emitting diode, the organic EL element OLED emits light when a voltage having a "low" level is applied to the scan line and a voltage equal to or higher than the forward voltage of the organic EL element is applied to the data line.

따라서, 유기 전계 발광 표시장치는 각각 다른 발광재료로 제조되어 레드(R), 그린(G), 블루(B)의 색상으로 발광하는 서브픽셀들이 하나의 픽셀(40)을 구성함으로써 풀 칼라(full-color)를 구현하게 된다. Accordingly, the organic light emitting display device is made of different light emitting materials, and subpixels emitting light of red (R), green (G), and blue (B) colors each pixel 40 to form a full pixel. -color).

하지만, 이러한 유기 EL 표시장치는 오랜 기간 사용 중에 블랙 패턴을 디스플레이하는 경우, 데이터 구동부(20)의 데이터 라인(D1~Dm) 출력을 플로우팅(floating) 상태로 구동하는데, 이와 같이, 진행성 픽셀 결함(defect)이 발생하는 경우에는 플로우팅 상태로의 구동에 따른 데이터 라인(D1~Dm)과 스캔 라인(S1~Sn)이 상호 쇼트 상태가 되고 이로 인하여 그 데이터 라인(D1~Dm)상에는 전체가 휘선으로 나타나는 문제점이 있었다. However, when the organic EL display displays a black pattern during long periods of use, the organic EL display drives the output of the data lines D1 to Dm of the data driver 20 in a floating state. If a defect occurs, the data lines D1 to Dm and the scan lines S1 to Sn according to the driving in the floating state are shorted to each other, and thus, the entire lines are formed on the data lines D1 to Dm. There was a problem appearing as a dashed line.

본 발명은 전술한 문제점을 해결하기 위해 안출된 것으로서, 블랙 패턴을 디스플레이시 각 데이터 라인 출력을 플로우팅 상태에서 접지로 설정하여 픽셀 결함으로 인해 발생되는 휘선을 제거할 수 있도록 한 유기 이엘 구동 방법을 제공하는 데 그 목적이 있다. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and an organic EL driving method capable of removing bright lines caused by pixel defects by setting each data line output to a ground in a floating state when displaying a black pattern. The purpose is to provide.

전술한 목적을 달성하기 위해 안출된 본 발명의 구성은 다음과 같다. 본 발명은 매트릭스 형태로 로우방향과 컬럼 방향으로 배열되는 픽셀과, 다수의 스캔라 인이 설치되어 상기 스캔 라인 중 어느 하나를 통해 상기 픽셀로 스캔 신호를 공급하는 스캔구동부, 및 상기 스캔 라인들과 교차하는 다수의 데이터 라인들을 통해 상기 픽셀에 구동전류를 공급하는 데이터 구동부로 이루어진 유기 EL 표시장치의 구동 방법에 있어서, 블랙 패턴 디스플레이시에 상기 각 데이터 라인의 출력을 접지로 설정하여 상기 유기 EL 표시장치의 픽셀 결함으로 인한 휘선을 제거할 수 있도록 한 것을 특징으로 한다. The configuration of the present invention devised to achieve the above object is as follows. According to the present invention, a pixel arranged in a row direction and a column direction in a matrix form, a scan driver configured to supply a scan signal to the pixel through any one of the scan lines, is provided with a plurality of scan lines, and the scan lines; A driving method of an organic EL display device comprising a data driver for supplying a driving current to the pixel through a plurality of crossing data lines, the organic EL display by setting an output of each data line to ground during a black pattern display. Characterized in that it is possible to remove the bright lines caused by the pixel defects of the device.

이하에서는 본 발명의 바람직한 실시예를 첨부된 도면을 참조하여 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

도 3 은 본 발명에 따른 유기 EL 표시장치의 구동 방법을 나타낸 구동 회로도이다.3 is a driving circuit diagram showing a driving method of an organic EL display device according to the present invention.

본 발명에 따른 유기 EL 구동 방법은 진행성 픽셀 결함시 유기 EL 소자에 발생되는 쇼트에 의한 휘선을 제거하기 위한 것으로서, 블랙 패턴을 디스플레이하는 경우엔 각 데이터 라인(D1~Dm)을 통해 입력되는 구동전류을 제어하기 위해 데이터 드라이버(20)의 수직 구동 절환 스위치(S21~S2m)을 접지로 설정한다. The organic EL driving method according to the present invention is to remove the bright lines caused by the short generated in the organic EL element in the case of a progressive pixel defect. When the black pattern is displayed, the driving current inputted through each data line D1 to Dm is used. In order to control, the vertical drive switching switches S21 to S2m of the data driver 20 are set to ground.

즉, 블랙 패턴을 디스플레이하는 경우엔, 스캔 구동부(10)의 해당 수평 구동 절환 스위치(S11~S1n)는 접지 상태로 둔 상태이고, 구동 데이터가 0000가 입력되므로 이를 감지하여 데이터 구동부(20)의 해당 수직 구동 절환 스위치(S21~S2m)를 접지 상태로 연결함으로써, 구동전원이 0V가 인가되도록 한다. That is, in the case of displaying the black pattern, the corresponding horizontal drive switching switches S11 to S1n of the scan driver 10 are in a ground state, and since 0000 is inputted, the drive data is sensed to detect the black pattern. By connecting the corresponding vertical drive switching switch (S21 ~ S2m) to the ground state, the drive power is applied to 0V.

이에 따라, 데이터 구동부(20)를 통해 입력되는 구동전원이 0V가 되어 해당 데이터 라인(D1~Dm)에 발생되는 휘선을 제거할 수가 있다. As a result, the driving power input through the data driver 20 becomes 0V, so that bright lines generated in the data lines D1 to Dm can be removed.

본 발명은 전술한 실시예에 국한되지 않고 본 발명의 기술사상이 허용하는 범위 내에서 다양하게 변형하여 실시할 수 있다. The present invention is not limited to the above-described embodiments and can be carried out in various modifications within the scope of the technical idea of the present invention.

이와 같이 구성되는 본 발명에 따르면, 블랙 패턴을 디스플레이시 각 데이터 라인 출력을 플로우팅 상태에서 접지로 설정하여 픽셀 결함으로 인해 발생되는 휘선을 제거할 수 있다. According to the present invention configured as described above, when the black pattern is displayed, each data line output can be set to ground in a floating state to remove bright lines caused by pixel defects.

Claims (1)

매트릭스 형태로 로우방향과 컬럼 방향으로 배열되는 픽셀과, 다수의 스캔라인이 설치되어 상기 스캔 라인 중 어느 하나를 통해 상기 픽셀로 스캔 신호를 공급하는 스캔구동부, 및 상기 스캔 라인들과 교차하는 다수의 데이터 라인들을 통해 상기 픽셀에 구동전류를 공급하는 데이터 구동부로 이루어진 유기 EL 표시장치의 구동 방법에 있어서, Pixels arranged in a row direction and a column direction in a matrix form, a plurality of scan lines are provided, and a scan driver for supplying a scan signal to the pixels through any one of the scan lines, and a plurality of intersecting scan lines. A driving method of an organic EL display device comprising a data driver for supplying a driving current to the pixel through data lines, 블랙 패턴 디스플레이시에 상기 각 데이터 라인의 출력을 접지로 설정하여 상기 유기 EL 표시장치의 픽셀 결함으로 인한 휘선을 제거할 수 있도록 한 것을 특징으로 하는 유기 EL 구동 방법.And a bright line caused by pixel defects of the organic EL display device by setting the output of each data line to ground during black pattern display.
KR1020050066064A 2005-07-20 2005-07-20 Method for driving organic electrolumineascence KR20070011014A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101469481B1 (en) * 2011-11-25 2014-12-05 엘지디스플레이 주식회사 Display panel for display device and method for detecting defects of signal line

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101469481B1 (en) * 2011-11-25 2014-12-05 엘지디스플레이 주식회사 Display panel for display device and method for detecting defects of signal line

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