KR20160044133A - Driving method of organic light emitting display device - Google Patents

Driving method of organic light emitting display device Download PDF

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KR20160044133A
KR20160044133A KR1020140138379A KR20140138379A KR20160044133A KR 20160044133 A KR20160044133 A KR 20160044133A KR 1020140138379 A KR1020140138379 A KR 1020140138379A KR 20140138379 A KR20140138379 A KR 20140138379A KR 20160044133 A KR20160044133 A KR 20160044133A
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pixels
light emitting
organic light
channel
regression equation
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KR1020140138379A
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Korean (ko)
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이욱
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삼성디스플레이 주식회사
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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
    • G09G3/3258—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 voltage across the light-emitting element
    • 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
    • G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage 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
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0876—Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery
    • 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
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

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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 El Displays (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The present invention relates to a method for driving an organic electroluminescence display device, which is capable of improving display quality. According to an embodiment of the present invention, a method for driving an organic electroluminescence display device, including a compensation unit extracting degradation information of an organic light emitting diode included in pixels, comprises the steps of: extracting voltage from the pixels while changing voltage, which is supplied to the pixels, at least two times; computing a regression equation for each channel in accordance with the voltage extracted from the pixels; generating a representative drift curve from the regression equation; generating a compensation value for each channel while fitting the regression equation for each channel against the representative drift curve.

Description

유기전계발광 표시장치의 구동방법{DRIVING METHOD OF ORGANIC LIGHT EMITTING DISPLAY DEVICE}TECHNICAL FIELD [0001] The present invention relates to a driving method of an organic light emitting display,

본 발명의 실시예는 유기전계발광 표시장치의 구동방법에 관한 것으로, 특히 표시품질을 향상시킬 수 있도록 한 유기전계발광 표시장치의 구동방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving method of an organic light emitting display, and more particularly, to a driving method of an organic light emitting display in which display quality can be improved.

정보화 기술이 발달함에 따라 사용자와 정보간의 연결매체인 표시장치의 중요성이 부각되고 있다. 이에 부응하여 액정 표시장치(Liquid Crystal Display Device), 유기전계발광 표시장치(Organic Light Emitting Display Device) 및 플라즈마 디스플레이 패널(Plasma Display Panel) 등과 같은 평판 표시장치(Flat Panel Display)의 사용이 증가하고 있다.As the information technology is developed, the importance of the display device, which is a connection medium between the user and the information, is emphasized. In response to this, the use of flat panel displays such as a liquid crystal display device, an organic light emitting display device, and a plasma display panel has been increasing .

유기전계발광 표시장치는 복수의 데이터선, 주사선, 전원선의 교차부에 매트릭스 형태로 배열되는 복수개의 화소를 구비한다.　 화소들은 일반적으로 유기 발광 다이오드, 유기 발광 다이오드로 흐르는 전류량을 제어하기 위한 구동 트랜지스터를 포함한다.　 이와 같은 화소들은 데이터신호에 대응하여 구동 트랜지스터로부터 유기 발광 다이오드로 전류를 공급하면서 소정 휘도의 빛을 생성한다. An organic light emitting display includes a plurality of pixels arranged in a matrix at intersections of a plurality of data lines, a plurality of scanning lines, and a plurality of power lines. The pixels generally include an organic light emitting diode and a driving transistor for controlling the amount of current flowing to the organic light emitting diode. Such pixels generate light of a predetermined luminance while supplying a current from the driving transistor to the organic light emitting diode corresponding to the data signal.

이와 같은 유기전계발광 표시장치는 시간이 지남에 따라서 유기 발광 다이오드가 열화되고, 이에 따라 균일한 영상을 표시하지 못한다. 이를 극복하기 위하여, 유기 발광 다이오드의 열화를 외부에서 보상하는 방법이 제안되었다. 하지만, 유기 발광 다이오드의 열화를 외부에서 보상하는 경우 채널간 편차에 의하여 정확한 보상이 이루어 지지 않는다.In such an organic light emitting display device, the organic light emitting diode deteriorates over time, and accordingly, a uniform image can not be displayed. In order to overcome this problem, a method of externally compensating the deterioration of the organic light emitting diode has been proposed. However, when the deterioration of the organic light emitting diode is externally compensated, accurate compensation can not be performed due to the interchannel deviation.

따라서, 본 발명이 이루고자 하는 기술적 과제는 표시품질을 향상시킬 수 있도록 한 유기전계발광 표시장치의 구동방법을 제공하는 것이다. SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a method of driving an organic light emitting display device capable of improving display quality.

본 발명의 실시예에 의한 화소들에 포함된 유기 발광 다이오드의 열화정보를 추출하기 위한 보상부를 구비하는 유기전계발광 표시장치의 구동방법에 있어서, 상기 화소들로 공급되는 전압을 적어도 두 번 이상 변경하면서 상기 화소들로부터 전압을 추출하는 단계와, 상기 화소들로부터 추출된 전압에 대응하여 채널별 회귀식을 산출하는 단계와, 상기 회귀식으로부터 대표 추세선을 생성하는 단계와, 상기 채널별 회귀식을 상기 대표 추세선으로 피팅하면서 상기 채널별 보상값을 생성하는 단계를 포함한다.The method of driving an organic light emitting display including a compensator for extracting deterioration information of an organic light emitting diode included in pixels according to an exemplary embodiment of the present invention includes the steps of: Calculating a regression equation for each channel corresponding to the voltage extracted from the pixels, generating a representative trend line from the regression equation, and calculating a regression equation for each channel, And generating the channel-specific compensation value while fitting to the representative trend line.

실시 예에 의한, 상기 대표 추세선은 상기 회귀식들을 최소 자승법 또는 평균화하여 생성된다.According to an embodiment, the representative trendline is generated by least squares or averaging the regression equations.

실시 예에 의한, 상기 보상부로부터 상기 화소들 각각의 열화정보가 추출된 후 상기 보상값을 이용하여 상기 채널별 편차를 보상하는 단계를 더 포함한다.The method may further include compensating the channel-by-channel variation using the compensation value after deteriorating information of each of the pixels is extracted from the compensating unit according to the embodiment.

실시 예에 의한, 상기 화소들 각각에 포함된 유기 발광 다이오드의 특성을 반영하여 상기 보정값을 정정하는 단계를 더 포함한다.The method may further include correcting the correction value by reflecting characteristics of the organic light emitting diode included in each of the pixels according to the embodiment.

본 발명의 실시예에 의한 유기전계발광 표시장치의 구동방법에 의하면 채널 편차가 보상될 수 있는 보정값을 저장하고, 화소들로부터 추출되는 열화정보를 상기 보정값을 이용하여 보정한다. 그러면, 화소들 각각의 열화정보에서 채널 편차가 보정되고, 이에 따라 정확한 보상이 이루어질 수 있다. According to the driving method of an organic light emitting display according to an embodiment of the present invention, a correction value capable of compensating for a channel deviation is stored, and deterioration information extracted from pixels is corrected using the correction value. Then, the channel deviation is corrected in the deterioration information of each of the pixels, and accurate compensation can be performed accordingly.

도 1은 본 발명의 실시예에 의한 유기전계발광 표시장치를 나타내는 도면이다.
도 2는 도 1에 도시된 화소 및 보상부의 실시예를 나타내는 도면이다.
도 3은 본 발명의 실시예에 의한 채널 편차 보상방법을 나타내는 도면이다.
도 4a 내지 도 4c는 도 3의 보상방법에 대한 구동과정을 나타내는 도면이다.
도 5는 본 발명의 다른 실시예에 의한 채널 편차 보상방법을 나타내는 도면이다. 1 is a view illustrating an organic light emitting display according to an embodiment of the present invention.
2 is a view showing an embodiment of the pixel and the compensation unit shown in FIG.
3 is a diagram illustrating a channel deviation compensation method according to an embodiment of the present invention.
4A to 4C are diagrams illustrating a driving procedure for the compensation method of FIG.
5 is a diagram illustrating a channel deviation compensation method according to another embodiment of the present invention.

이하, 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 본 발명을 용이하게 실시할 수 있는 바람직한 실시 예가 첨부된 도 1 내지 도 5를 참조하여 자세히 설명하면 다음과 같다.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명의 실시예에 의한 유기전계발광 표시장치를 나타내는 도면이다.1 is a view illustrating an organic light emitting display according to an embodiment of the present invention.

도 1을 참조하면, 본 발명의 실시예에 의한 유기전계발광 표시장치는 주사선들(S1 내지 Sn) 및 데이터선들(D1 내지 Dm)의 교차부에 위치되는 화소들(140)을 포함하는 화소부(130)와, 주사선들(S1 내지 Sn)을 구동하기 위한 주사 구동부(110)와, 데이터선들(D1 내지 Dm)을 구동하기 위한 데이터 구동부(120)를 구비한다. 1, an organic light emitting display according to an exemplary embodiment of the present invention includes a pixel 140 including pixels 140 located at intersections of scan lines S1 to Sn and data lines D1 to Dm, A scan driver 130 for driving the scan lines S1 to Sn and a data driver 120 for driving the data lines D1 to Dm.

또한, 본 발명의 실시예에 의한 유기전계발광 표시장치는 화소들(140) 각각에 포함된 유기 발광 다이오드의 열화정보를 추출하기 위한 보상부(160)와, 보상부(160)로부터 추출되는 열화정보 및 채널 편차를 보상할 수 있는 보정값이 저장되는 저장부(170)와, 주사 구동부(110), 데이터 구동부(120) 및 보상부(160)를 제어하기 위한 타이밍 제어부(150)를 구비한다. The organic light emitting display according to an embodiment of the present invention includes a compensation unit 160 for extracting deterioration information of an organic light emitting diode included in each of the pixels 140, And a timing controller 150 for controlling the scan driver 110, the data driver 120, and the compensator 160. The scan driver 110, the data driver 120, .

화소부(130)는 주사선들(S1 내지 Sn) 및 데이터선들(D1 내지 Dm)에 의하여 구획된 영역에 위치되는 화소들(140)을 구비한다. 화소들(140)은 외부로부터 제 1전원(ELVDD) 및 제 2전원(ELVSS)을 공급받는다. 이와 같은 화소들(140)은 데이터신호에 대응하여 제 1전원(ELVDD)으로부터 유기 발광 다이오드(미도시)를 경유하여 제 1전원(ELVSS)으로 공급되는 전류량을 제어한다. The pixel unit 130 includes pixels 140 positioned in a region partitioned by the scan lines S1 to Sn and the data lines D1 to Dm. The pixels 140 are supplied with a first power ELVDD and a second power ELVSS from the outside. The pixels 140 control the amount of current supplied from the first power source ELVDD to the first power source ELVSS via an organic light emitting diode (not shown) corresponding to the data signal.

주사 구동부(110)는 타이밍 제어부(150)의 제어에 대응하여 주사선들(S1 내지 Sn)로 주사신호를 공급한다. 일례로, 주사 구동부(110)는 주사선들(S1 내지 Sn)로 주사신호를 순차적으로 공급할 수 있다. 주사선들(S1 내지 Sn)로 주사신호가 순차적으로 공급되면 화소들(140)이 수평라인 단위로 순차적으로 선택된다. The scan driver 110 supplies the scan signals to the scan lines S1 to Sn in response to the control of the timing controller 150. [ For example, the scan driver 110 may sequentially supply the scan signals to the scan lines S1 to Sn. When the scan signals are sequentially supplied to the scan lines S1 to Sn, the pixels 140 are sequentially selected in units of horizontal lines.

데이터 구동부(120)는 타이밍 제어부(150)로부터 공급되는 제 2데이터(Data2)들을 이용하여 데이터신호를 생성하고, 생성된 데이터신호를 주사신호에 동기되도록 데이터선들(D1 내지 Dm)로 공급한다. 그러면, 주사신호에 의하여 선택된 화소들(140)로 데이터신호가 공급되고, 이에 따라 화소들(140)에는 데이터신호에 대응하는 전압이 저장된다. The data driver 120 generates data signals using the second data Data2 supplied from the timing controller 150 and supplies the generated data signals to the data lines D1 to Dm in synchronization with the scan signals. Then, a data signal is supplied to the pixels 140 selected by the scan signal, and accordingly, a voltage corresponding to the data signal is stored in the pixels 140.

타이밍 제어부(150)는 주사 구동부(110), 데이터 구동부(120) 및 보상부(160)를 제어한다. 그리고, 타이밍 제어부(150)는 보상부(160)를 경유하여 채널의 편차가 보상될 수 있는 보정값을 추출하고, 추출된 보정값을 저장부(170)에 저장한다. 또한, 타이밍 제어부(150)는 보상부(160)로부터 화소들(140) 각각에 포함된 유기 발광 다이오드의 열화정보를 추출하고, 보정값을 이용하여 열화정보에서 채널 편차를 제거한 후 저장부(170)에 저장한다. 이후, 타이밍 제어부(150)는 저장부(170)에 저장된 열화정보에 대응하여 유기 발광 다이오드의 열화가 보상될 수 있도록 외부로부터 입력되는 제 1데이터(Data1)의 비트값을 변경하여 제 2데이터(Data2)를 생성한다.The timing controller 150 controls the scan driver 110, the data driver 120, and the compensator 160. The timing control unit 150 extracts a correction value that can compensate for the channel deviation via the compensation unit 160 and stores the extracted correction value in the storage unit 170. [ The timing controller 150 extracts deterioration information of the organic light emitting diodes included in each of the pixels 140 from the compensator 160 and removes the channel deviation from the deterioration information using the correction values, ). The timing controller 150 changes the bit value of the first data Data1 input from the outside so that the deterioration of the organic light emitting diode can be compensated for in accordance with the deterioration information stored in the storage unit 170, Data2).

보상부(160)는 타이밍 제어부(150)의 제어에 대응하여 화소들(140) 각각으로부터 유기 발광 다이오드의 열화정보 및 채널 편차를 보상하기 위한 보정값을 추출한다.
The compensation unit 160 extracts correction values for compensating deterioration information and channel deviation of the organic light emitting diodes from each of the pixels 140 in response to the control of the timing controller 150. [

도 2는 도 1에 도시된 화소 및 보상부의 실시예를 나타내는 도면이다.2 is a view showing an embodiment of the pixel and the compensation unit shown in FIG.

도 2를 참조하면, 본 발명의 실시예에 의한 화소(140)는 화소회로(142)와 유기 발광 다이오드(OLED)를 구비한다. Referring to FIG. 2, a pixel 140 according to an embodiment of the present invention includes a pixel circuit 142 and an organic light emitting diode (OLED).

유기 발광 다이오드(OLED)의 애노드전극은 화소회로(142)에 접속되고, 캐소드전극은 제 2전원(ELVSS)에 접속된다. 이와 같은 유기 발광 다이오드(OLED)는 화소회로(142)로부터 공급되는 전류에 대응하여 소정 휘도의 빛을 생성한다. The anode electrode of the organic light emitting diode (OLED) is connected to the pixel circuit 142, and the cathode electrode is connected to the second power source ELVSS. The organic light emitting diode OLED generates light having a predetermined luminance corresponding to the current supplied from the pixel circuit 142.

화소회로(142)는 주사선(S1)으로 주사신호가 공급될 때 데이터선(D1)으로부터 데이터신호를 공급받는다. 데이터신호를 공급받은 화소회로(142)는 데이터신호에 대응하여 제 1전원(ELVDD)으로부터 유기 발광 다이오드(OLED)를 경유하여 제 2전원(ELVSS)으로 흐르는 전류량을 제어한다. 이를 위하여, 화소회로(142)는 하나 이상의 트랜지스터 및 커패시터를 포함하도록 구성된다. 본원 발명에서 화소회로(142)는 현재 공지된 다양한 형태의 회로로 구성될 수 있다.The pixel circuit 142 receives the data signal from the data line D1 when the scanning signal is supplied to the scanning line S1. The pixel circuit 142 receiving the data signal controls the amount of current flowing from the first power source ELVDD to the second power source ELVSS via the organic light emitting diode OLED in response to the data signal. To this end, the pixel circuit 142 is configured to include one or more transistors and a capacitor. In the present invention, the pixel circuit 142 may be composed of various types of circuits currently known.

본 발명의 실시예에 의한 보상부(160)는 적분기(162), 제 1커패시터(C1), 제 2커패시터(C2) 및 아날로그 디지털 변환기(Analog Digital Converter : 이하 "ADC"라 하기로 함)(164)를 구비한다. The compensation unit 160 according to the embodiment of the present invention includes an integrator 162, a first capacitor C1, a second capacitor C2 and an analog digital converter (ADC) 164.

적분기(162)의 제 1입력단자(+)는 기준전원(Vref)과 접속되고, 제 2입력단자(-)는 데이터선(D1)에 접속된다. 이와 같은 적분기(162)는 기준전원(Vref)의 전압에 대응하여 제 2입력단자(-)로부터 유기 발광 다이오드(OLED)의 열화정보를 포함하는 소정의 전압을 공급받는다. The first input terminal (+) of the integrator 162 is connected to the reference power supply Vref, and the second input terminal (-) is connected to the data line D1. The integrator 162 receives a predetermined voltage including the deterioration information of the organic light emitting diode (OLED) from the second input terminal (-) corresponding to the voltage of the reference power supply Vref.

제 1커패시터(C1)는 제 2입력단자(-)와 적분기(162)의 출력단자 사이에 접속된다. 제 2커패시터(C2)는 그라운드 전압과 적분기(162)의 출력단자 사이에 접속된다.The first capacitor C1 is connected between the second input terminal (-) and the output terminal of the integrator 162. [ The second capacitor (C2) is connected between the ground voltage and the output terminal of the integrator (162).

ADC(164)는 적분기(162)의 출력단자에 접속된다. 이와 같은 ADC(162)는 적분기(162)로부터 공급되는 소정의 전압을 디지털값으로 변환하고, 변화된 디지털값을 열화정보로써 타이밍 제어부(150)로 공급한다. The ADC 164 is connected to the output terminal of the integrator 162. The ADC 162 converts a predetermined voltage supplied from the integrator 162 into a digital value and supplies the changed digital value to the timing controller 150 as deterioration information.

한편, 본원 발명에서 보상부(160)는 ADC(164)를 포함하도록 현재 공지된 다양한 형태의 회로로 구성될 수 있다. 일례로, 보상부(160)는 도시되지 않은 멀티플렉서를 추가로 구비하며, ADC(164)가 복수의 데이터선과 순차적으로 접속되도록 제어할 수 있다.
In the present invention, the compensation unit 160 may be configured with various types of circuits currently known to include the ADC 164. For example, the compensator 160 may further include a multiplexer (not shown) and may be controlled so that the ADC 164 is sequentially connected to the plurality of data lines.

도 3은 본 발명의 실시예에 의한 채널 편차 보상방법을 나타내는 도면이다.3 is a diagram illustrating a channel deviation compensation method according to an embodiment of the present invention.

도 3을 참조하면, 먼저 타이밍 제어부(150)는 기준전원(Vref)을 2개 이상의 전압으로 순차적으로 변경한다.(S10) 기준전원(Vref)의 전압이 변경되며 데이터선(D)을 경유하여 화소(140)로부터 추출되는 전압도 변경된다. 여기서, 도 4a와 같이 기준전원(Vref)의 전압이 3번 변경되는 경우 화소(140)로부터 추출되는 전압(Vp)도 기준전원(Vref)의 전압에 따라서 3번 변경된다. 3, the timing controller 150 sequentially changes the reference power supply Vref to two or more voltages. (S10) The voltage of the reference power supply Vref is changed and the data voltage V The voltage extracted from the pixel 140 is also changed. 4A, when the voltage of the reference power supply Vref is changed three times, the voltage Vp extracted from the pixel 140 is also changed three times according to the voltage of the reference power supply Vref.

이후, 타이밍 제어부(150)는 화소(140)로부터 추출되는 복수의 전압을 이용하여 각 채널별 회귀식을 산출한다.(S12) 일례로, ADC(164) 각각이 디멀티플렉서에 의하여 4개의 데이터선과 접속되는 경우 도 4b와 같이 각 채널별 회귀식이 산출될 수 있다. Thereafter, the timing controller 150 calculates a regression equation for each channel using a plurality of voltages extracted from the pixel 140. (S12) In one example, each of the ADCs 164 is connected to four data lines by a demultiplexer The regression equation for each channel can be calculated as shown in FIG. 4B.

도4b에서 Sadc는 각 채널별 ADC의 기울기 정보를 나타내며, Soled는 각 화소별 유기 발광 다이오드(OLED)의 기울기 정보를 의미한다. 그리고, OFFSEToled는 각 화소별 유기 발광 다이오드(OLED)의 오프셋 값, OFFSETADC는 각 채널별 ADC의 오프셋 값을 의미한다. In FIG. 4B, Sadc represents slope information of the ADC for each channel, and Soled represents slope information of the organic light emitting diode (OLED) for each pixel. OFFSEToled means the offset value of the organic light emitting diode (OLED) for each pixel, and OFFSET ADC means the offset value of the ADC for each channel.

S12 단계에서 회귀식이 산출된 후 최소 자승법 또는 각 회귀식들을 평균화하여 대표 추세선을 생성한다.(S14) 여기서, 대표 추세선은 도 4b에 도시된 바와 같이 Y = SAVG × Vref + OFFSETAVG로 표시될 수 있다. The representative trend line is represented by Y = S AVG x Vref + OFFSET AVG , as shown in FIG. 4B. [0064] In step S12, the representative trend line is generated by calculating a regression equation and averaging the least squares method or each regression equation .

S14 단계에서 대표 추세선이 생성된 후 각 채널별 회귀식을 대표 추세선으로 피팅(fitting)한다.(S16) 즉, S14 단계에서는 도 4c와 같이 대표 추세선과 유사 또는 일치되도록 각 채널별 회귀식을 조절한다. S16 단계에서 각 채널별 휘귀식이 조절될 때 각 채널별로 보정값이 생성된다.(S18) 여기서, 보정값은 각 채널별 회귀식이 대표 추세선과 일치되도록 보정하는 값, 즉 채널별 편차를 보상할 수 있는 값으로 설정된다.In step S14, the representative trend line is generated and then the regression equation for each channel is fitted to the representative trend line. (S16) In other words, in step S14, the regression equation for each channel is adjusted to be similar to or coincident with the representative trend line as shown in FIG. do. In step S16, a correction value is generated for each channel when the channel equation is adjusted for each channel (S18). Here, the correction value is a value for correcting the channel-by- Lt; / RTI >

S18 단계에서 생성된 보정값은 저장부(170)에 저장된다. 이후, 타이밍 제어부(150)는 보상부(160)로부터 열화정보를 공급받고, 공급받은 열화정보를 보정값을 이용하여 채널 편차가 제거되도록 하여 저장부(170)에 저장한다. 그러면, 채널 편차와 무관하게 화소(140) 각각에 포함된 유기 발광 다이오드의 순수 열화정보가 저장부(170)에 저장되고, 이에 따라 안정적으로 화소(140) 각각의 유기 발광 다이오드의 열화를 보상할 수 있다.The correction value generated in step S18 is stored in the storage unit 170. [ Thereafter, the timing controller 150 receives the deterioration information from the compensator 160, and stores the supplied deterioration information in the storage unit 170 so that the channel deviation is removed using the correction value. Then, the pure deterioration information of the organic light emitting diodes included in each of the pixels 140 is stored in the storage unit 170 regardless of the channel deviation, thereby compensating for the deterioration of the organic light emitting diodes of each pixel 140 stably .

추가적으로, 본원 발명에서는 각 채널에서 적어도 하나의 화소(140)로부터 보정값을 추출하여 저장부(170)에 저장한다. 그러면, 보정값에 의하여 채널별 편차를 제거할 수 있다. 또한, 본원 발명에서는 모든 화소들(140)로부터 보정값을 추출하여 저장부(170)에 저장할 수 있다. 그러면, 화소들(140) 각각에 대응하여 채널 편차가 보상될 수 있다.
In addition, in the present invention, correction values are extracted from at least one pixel 140 in each channel and stored in the storage unit 170. Then, the channel-specific deviation can be removed by the correction value. In the present invention, the correction values may be extracted from all the pixels 140 and stored in the storage unit 170. Then, the channel deviation can be compensated for in correspondence with each of the pixels 140.

도 5는 본 발명의 다른 실시예에 의한 채널 편차 보상방법을 나타내는 도면이다. 도 5를 설명할 때 도 4와 동일한 부분에 대해서는 동일한 도면부호를 할당함과 아울러 상세한 설명을 생략하기로 한다.5 is a diagram illustrating a channel deviation compensation method according to another embodiment of the present invention. 5, the same reference numerals are assigned to the same components as those in FIG. 4, and a detailed description thereof will be omitted.

도 5를 참조하면, S16 단계에서 채널별 회귀식을 대표 추세선으로 피팅한 후 유기 발광 다이오드(OLED)의 특성을 반영하여 보정값을 생성한다.(S17, S18) 5, in step S16, a channel-by-channel regression equation is fitted to a representative trend line, and a correction value is generated by reflecting characteristics of the organic light emitting diode OLED (S17, S18)

상세히 설명하면, 화소들(140) 각각에 포함된 유기 발광 다이오드(OLED)는 공정 편차에 의하여 상이한 특성을 갖는다. 이때, 유기 발광 다이오드(OLED)의 특성은 도 4b의 회귀식에 도시된 바와 Soled의 형태로 나타난다. In detail, the organic light emitting diode (OLED) included in each of the pixels 140 has different characteristics depending on the process variation. At this time, the characteristics of the organic light emitting diode (OLED) appear in the form of Soled as shown in the regression equation of FIG. 4B.

S17 단계에서는 각 채널별 휘귀식에서 Soled 값에 특정 값을 더하거나 감하여 유기 발광 다이오드(OLED)의 특성을 보상할 수 있다. 일례로, 각 채널별 Soled 값을 평균화하고, 이 평균값을 대표 추세선에 반영하여 보정값을 생성할 수 있다.In step S17, the characteristic value of the organic light emitting diode OLED can be compensated by adding or subtracting a specific value to the Soled value in each channel. For example, a Soled value for each channel may be averaged, and the average value may be reflected on a representative trend line to generate a correction value.

또한, S17 단계에서는 인접된 채널에서 적어도 하나의 Soled값을 추출하고, 추출된 값을 평균화할 수 있다. 이후, 이 평균값을 대표 추세선을 반영하여 보정값을 생성할 수 있다. Also, at step S17, at least one Soled value may be extracted from adjacent channels and the extracted values may be averaged. Thereafter, the average value can be generated by reflecting the representative trendline.

본 발명의 기술 사상은 상기 바람직한 실시예에 따라 구체적으로 기술되었으나, 상기한 실시예는 그 설명을 위한 것이며 그 제한을 위한 것이 아님을 주의하여야 한다. 또한, 본 발명의 기술 분야의 통상의 지식을 가진 자라면 본 발명의 기술 사상의 범위 내에서 다양한 변형예가 가능함을 이해할 수 있을 것이다.While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be apparent to those skilled in the art that various modifications may be made without departing from the scope of the present invention.

110 : 주사 구동부 120 : 데이터 구동부
130 : 화소부 140 : 화소
142 : 화소회로 150 : 타이밍 제어부
160 : 보상부 162 : 적분기
164 : ADC 170 : 저장부110: scan driver 120:
130: pixel portion 140: pixel
142: pixel circuit 150: timing control section
160: compensator 162: integrator
164: ADC 170:

Claims (4)

화소들에 포함된 유기 발광 다이오드의 열화정보를 추출하기 위한 보상부를 구비하는 유기전계발광 표시장치의 구동방법에 있어서,
상기 화소들로 공급되는 전압을 적어도 두 번 이상 변경하면서 상기 화소들로부터 전압을 추출하는 단계와,
상기 화소들로부터 추출된 전압에 대응하여 채널별 회귀식을 산출하는 단계와,
상기 회귀식으로부터 대표 추세선을 생성하는 단계와,
상기 채널별 회귀식을 상기 대표 추세선으로 피팅하면서 상기 채널별 보상값을 생성하는 단계를 포함하는 것을 특징으로 하는 유기전계발광 표시장치의 구동방법.And a compensator for extracting deterioration information of the organic light emitting diodes included in the pixels, the method comprising:
Extracting a voltage from the pixels while changing a voltage supplied to the pixels at least twice or more;
Calculating a regression equation for each channel corresponding to the voltage extracted from the pixels;
Generating a representative trend line from the regression equation;
And generating the per-channel compensation value while fitting the regression equation for each channel to the representative trend line. 제 1항에 있어서,
상기 대표 추세선은 상기 회귀식들을 최소 자승법 또는 평균화하여 생성되는 것을 특징으로 하는 유기전계발광 표시장치의 구동방법. The method according to claim 1,
Wherein the representative trend line is generated by least squares or averaging the regression equations. 제 1항에 있어서,
상기 보상부로부터 상기 화소들 각각의 열화정보가 추출된 후 상기 보상값을 이용하여 상기 채널별 편차를 보상하는 단계를 더 포함하는 것을 특징으로 하는 유기전계발광 표시장치의 구동방법. The method according to claim 1,
And compensating the channel-by-channel variation using the compensation value after deteriorating information of each of the pixels is extracted from the compensation unit. 제 1항에 있어서,
상기 화소들 각각에 포함된 유기 발광 다이오드의 특성을 반영하여 상기 보정값을 정정하는 단계를 더 포함하는 것을 특징으로 하는 유기전계발광 표시장치의 구동방법.The method according to claim 1,
And correcting the correction value by reflecting a characteristic of the organic light emitting diode included in each of the pixels.
KR1020140138379A 2014-10-14 2014-10-14 Driving method of organic light emitting display device KR20160044133A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019061767A1 (en) * 2017-09-28 2019-04-04 深圳市华星光电半导体显示技术有限公司 Method for compensating amoled pixel differences
US10297193B2 (en) 2014-11-10 2019-05-21 Samsung Display Co., Ltd. Organic light-emitting display device and method of driving the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10297193B2 (en) 2014-11-10 2019-05-21 Samsung Display Co., Ltd. Organic light-emitting display device and method of driving the same
WO2019061767A1 (en) * 2017-09-28 2019-04-04 深圳市华星光电半导体显示技术有限公司 Method for compensating amoled pixel differences
US10748480B2 (en) 2017-09-28 2020-08-18 Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. Method of compensating AMOLED pixel difference

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