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KR20080076545A - Organic light emitting device - Google Patents

Organic light emitting device Download PDF

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Publication number
KR20080076545A
KR20080076545A KR1020070016631A KR20070016631A KR20080076545A KR 20080076545 A KR20080076545 A KR 20080076545A KR 1020070016631 A KR1020070016631 A KR 1020070016631A KR 20070016631 A KR20070016631 A KR 20070016631A KR 20080076545 A KR20080076545 A KR 20080076545A
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South Korea
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light emitting
organic light
thin film
emitting device
film transistor
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KR1020070016631A
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Korean (ko)
Inventor
최범락
고준철
박경태
송영록
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삼성전자주식회사
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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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K10/00—Organic devices specially adapted for rectifying, amplifying, oscillating or switching; Organic capacitors or resistors having potential barriers
    • H10K10/40—Organic transistors
    • H10K10/46—Field-effect transistors, e.g. organic thin-film transistors [OTFT]
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/123—Connection of the pixel electrodes to the thin film transistors [TFT]
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30—Devices specially adapted for multicolour light emission

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

본 발명은 유기전계발광장치에 관한 것이다. 본 발명에 따른 유기전계발광장치는 구동박막트랜지스터와, 구동박막트랜지스터에 직렬로 연결되어 있는 복수의 유기발광소자와, 유기발광소자에 연결되어 있는 공통전극과, 각 유기발광소자와 구동박막트랜지스터 간의 연결 및 각 유기발광소자와 공통전극 간의 연결을 스위칭하는 스위칭부와, 복수의 유기발광소자가 순차 및 반복적으로 구동되도록 스위칭부를 제어하는 제어부를 포함하는 것을 특징으로 한다. 이에 의하여 제조가 간단하면서 광효율이 향상된 유기전계발광장치가 제공된다.The present invention relates to an organic electroluminescent device. The organic light emitting device according to the present invention comprises a driving thin film transistor, a plurality of organic light emitting elements connected in series to the driving thin film transistor, a common electrode connected to the organic light emitting element, between each organic light emitting element and the driving thin film transistor And a switching unit for switching the connection and the connection between each organic light emitting element and the common electrode, and a control unit for controlling the switching unit to sequentially and repeatedly drive the plurality of organic light emitting elements. As a result, an organic electroluminescent device having simple manufacturing and improved light efficiency is provided.

Description

유기전계발광장치{ORGANIC LIGHT EMITTING DIODE}Organic Light Emitting Device {ORGANIC LIGHT EMITTING DIODE}

도 1은 본 발명의 일 실시예에 따른 유기전계발광장치의 등가 회로도이고,1 is an equivalent circuit diagram of an organic light emitting display device according to an embodiment of the present invention,

도 2는 본 발명의 일 실시예에 따른 유기전계발광장치의 발광층의 적층 구조를 도시한 개략도이고,2 is a schematic diagram showing a laminated structure of a light emitting layer of an organic light emitting display device according to an embodiment of the present invention;

도 3은 본 발명의 일 실시예에 따른 유기전계발광장치의 제어부에 의한 제1프레임 내지 제3프레임 구동에 따른 스위칭부의 온/ 오프를 도시한 도면이고,3 is a diagram illustrating on / off of a switching unit according to driving of the first frame to the third frame by the controller of the organic light emitting display device according to an embodiment of the present invention.

도 4 는 도3의 제1프레임에 따른 구동전류의 흐름을 도시한 등가회로도이고,4 is an equivalent circuit diagram illustrating a flow of driving current according to the first frame of FIG. 3;

도 5 는 도3의 제2프레임에 따른 구동전류의 흐름을 도시한 등가회로도이고,FIG. 5 is an equivalent circuit diagram illustrating a flow of driving current according to the second frame of FIG. 3;

도 6 는 도3의 제3프레임에 따른 구동전류의 흐름을 도시한 등가회로도이고,6 is an equivalent circuit diagram illustrating a flow of driving current according to a third frame of FIG. 3,

도 7은 본 발명의 일 실시예에 따른 유기전계발광장치의 제어부에 의한 제1프레임 내지 제4프레임 구동에 따른 스위칭부의 온/ 오프를 도시한 도면이고,FIG. 7 is a diagram illustrating on / off of a switching unit according to driving of first to fourth frames by a controller of an organic light emitting display device according to an embodiment of the present invention.

도 8은 도 7의 제4프레임에 따른 구동전류의 흐름을 도시한 등가회로도이다.FIG. 8 is an equivalent circuit diagram illustrating a flow of driving current according to the fourth frame of FIG. 7.

* 도면의 주요 부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

10 : 게이트선 20 : 데이터선10: gate line 20: data line

30 : 구동전압선 40 : 스위칭박막트랜지스터30: driving voltage line 40: switching thin film transistor

50 : 구동박막트랜지스터 60 : 축전기50: driving thin film transistor 60: capacitor

70 : 유기발광소자 80 : 공통전극70 organic light emitting device 80 common electrode

90 : 스위칭부 100 : 제어부90: switching unit 100: control unit

본 발명은 유기전계발광장치에 관한 것으로서, 보다 상세하게는 색변환부재가 필요 없는 유기전계발광장치와 그 구동방법에 관한 것이다.The present invention relates to an organic light emitting device, and more particularly, to an organic light emitting device that does not require a color conversion member and a driving method thereof.

최근 종래의 브라운관을 대신하여 유기전계발광장치(organic light emitting diode, OLED), 액정표시장치(liquid crystal display device, LCD), 플라즈마디스플레이패널(plasma display panel, PDP) 등의 평판표시장치가 많이 개발되고 있다. Recently, many flat panel display devices such as organic light emitting diodes (OLEDs), liquid crystal display devices (LCDs), and plasma display panels (PDPs) have been developed in place of conventional CRTs. It is becoming.

이 중 유기전계발광장치는 저전압 구동, 경량 박형, 광시야각 그리고 고속응답 등의 장점으로 인하여 각광 받고 있다. Among them, the organic light emitting display device is in the spotlight due to its advantages such as low voltage driving, light weight, wide viewing angle, and high speed response.

유기전계발광장치는 빛을 발광하는 유기발광소자를 포함한다.The organic light emitting device includes an organic light emitting device that emits light.

한편, 유기발광소자가 붉은색의 빛과, 녹색의 빛 및 파란색의 빛을 발광할 경우, 추가적인 쉐도우마스크를 이용하여 화소를 분할하는 미세 패터닝을 해야 하는 문제가 있다.On the other hand, when the organic light emitting device emits red light, green light and blue light, there is a problem in that fine patterning for dividing pixels using an additional shadow mask is required.

또한, 유기발광소자가 백색의 빛을 발광할 경우, 유기전계발광장치는 유기발광소자가 발광하는 백색의 빛의 색을 변환시키기 위해 컬러필터와 같은 색변환부재를 포함하게 된다.In addition, when the organic light emitting device emits white light, the organic light emitting device includes a color conversion member such as a color filter to convert the color of the white light emitted by the organic light emitting device.

그런데, 유기발광소자에서 발광된 백색의 빛이 색변환부재를 지나면서 광효율이 감소하는 문제가 있다.However, there is a problem in that the light efficiency of the white light emitted from the organic light emitting element is passed through the color conversion member is reduced.

따라서, 본 발명의 목적은 제조가 간단하면서 광효율이 향상된 유기전계발광장치를 제공하는 것이다.Accordingly, an object of the present invention is to provide an organic light emitting display device which is simple in manufacturing and has improved light efficiency.

상기 본 발명의 목적은 구동박막트랜지스터와, 구동박막트랜지스터에 직렬로 연결되어 있는 복수의 유기발광소자와, 유기발광소자에 연결되어 있는 공통전극과, 각 유기발광소자와 구동박막트랜지스터 간의 연결 및 각 유기발광소자와 공통전극 간의 연결을 스위칭하는 스위칭부와, 복수의 유기발광소자가 순차 및 반복적으로 구동되도록 스위칭부를 제어하는 제어부를 포함하는 유기전계발광장치에 의하여 달성될 수 있다.An object of the present invention is a driving thin film transistor, a plurality of organic light emitting elements connected in series to the driving thin film transistor, a common electrode connected to the organic light emitting element, the connection between each organic light emitting element and the driving thin film transistor and each It can be achieved by an organic light emitting device including a switching unit for switching the connection between the organic light emitting element and the common electrode, and a control unit for controlling the switching unit so that the plurality of organic light emitting elements are driven sequentially and repeatedly.

복수의 유기발광소자는 서로 다른 색의 빛을 발광하는 제1유기발광소자와, 제2유기발광소자와, 제3유기발광소자를 포함할 수 있다.The organic light emitting diodes may include a first organic light emitting diode, a second organic light emitting diode, and a third organic light emitting diode that emit light of different colors.

제1유기발광소자는 붉은색의 빛을 발광하는 제1발광층을 포함하고, 제2유기발광소자는 녹색의 빛을 발광하는 제2발광층을 포함하고, 제3유기발광소자는 파란색의 빛을 발광하는 제3발광층을 포함할 수 있다.The first organic light emitting device includes a first light emitting layer emitting red light, the second organic light emitting device includes a second light emitting layer emitting green light, and the third organic light emitting device emits blue light. It may include a third light emitting layer.

제1발광층과, 제2발광층과, 제3발광층은 두께방향으로 순차적으로 적층되어 있을 수 있다.The first light emitting layer, the second light emitting layer, and the third light emitting layer may be sequentially stacked in the thickness direction.

제어부는 제1유기발광소자의 구동과, 제2유기발광소자의 구동과, 제3유기발광소자의 구동과, 제1유기발광소자와 제2유기발광소자와 제3유기발광소자의 동시 구동이 순차 및 반복되도록 스위칭부를 제어할 수 있다.The controller is configured to drive the first organic light emitting element, the second organic light emitting element, the third organic light emitting element, and simultaneously drive the first organic light emitting element, the second organic light emitting element, and the third organic light emitting element. The switching unit can be controlled to be sequentially and repeated.

이하, 첨부도면을 참조하여 본 발명에 대하여 설명한다.Hereinafter, the present invention will be described with reference to the accompanying drawings.

이하, 도 1 및 도 2를 참조하여, 본 발명의 일 실시예에 따른 유기전계발광장치의 화소에 대한 등가회로도를 설명한다.Hereinafter, an equivalent circuit diagram of a pixel of an organic light emitting display device according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

도 1에 도시된 바와 같이, 하나의 화소에는 복수의 신호선이 마련되어 있다. 신호선은 주사신호를 전달하는 게이트선(10), 데이터 신호를 전달하는 데이터선(20), 구동 전압을 전달하는 구동전압선(30)을 포함한다. 데이터선(20)과 구동전압선(30)은 서로 인접하여 나란히 배치되어 있으며, 게이트선(10)은 데이터선(20) 및 구동전압선(30)과 수직을 이루며 연장되어 있다.As shown in FIG. 1, a plurality of signal lines are provided in one pixel. The signal line includes a gate line 10 for transmitting a scan signal, a data line 20 for transmitting a data signal, and a driving voltage line 30 for transmitting a driving voltage. The data line 20 and the driving voltage line 30 are adjacent to each other and are arranged side by side, and the gate line 10 extends perpendicular to the data line 20 and the driving voltage line 30.

각 화소는 스위칭박막트랜지스터(40), 구동박막트랜지스터(50), 축전기(60), 유기발광소자(70), 공통전극(80), 스위칭부(90), 제어부(100)를 포함한다.Each pixel includes a switching thin film transistor 40, a driving thin film transistor 50, a capacitor 60, an organic light emitting element 70, a common electrode 80, a switching unit 90, and a controller 100.

스위칭박막트랜지스터(40)는 제어 단자, 입력 단자 및 출력 단자를 가지는데, 제어 단자는 게이트선(10)에 연결되어 있고, 입력 단자는 데이터선(20)에 연결되어 있으며, 출력 단자는 구동박막트랜지스터(50)의 제어 단자에 연결되어 있다. 스위칭박막트랜지스터(40)는 게이트선(10)에 인가되는 주사 신호에 따라 데이터선(20)에 인가되는 데이터 신호를 구동박막트랜지스터(50)에 전달한다.The switching thin film transistor 40 has a control terminal, an input terminal, and an output terminal. The control terminal is connected to the gate line 10, the input terminal is connected to the data line 20, and the output terminal is a driving thin film. It is connected to the control terminal of the transistor 50. The switching thin film transistor 40 transfers the data signal applied to the data line 20 to the driving thin film transistor 50 according to the scan signal applied to the gate line 10.

구동박막트랜지스터(50)는 제어 단자, 입력 단자 및 출력단자를 가지는데, 제어단자는 스위칭박막트랜지스터(40)에 연결되어 있고, 입력 단자는 구동전압선(30)에 연결되어 있으며, 출력 단자는 유기발광소자(70)에 연결되어 있다.The driving thin film transistor 50 has a control terminal, an input terminal and an output terminal. The control terminal is connected to the switching thin film transistor 40, the input terminal is connected to the driving voltage line 30, and the output terminal is organic. It is connected to the light emitting element 70.

축전기(60)는 구동박막트랜지스터(50)의 제어 단자와 입력단자 사이에 연결되어 있다. 축전기(60)는 구동박막트랜지스터(50)의 제어 단자에 입력되는 데이터 신호를 충전하고 유지한다.The capacitor 60 is connected between the control terminal and the input terminal of the driving thin film transistor 50. The capacitor 60 charges and maintains a data signal input to the control terminal of the driving thin film transistor 50.

유기발광소자(70)는 복수로 마련되어 있으며, 구동박막트랜지스터(50)의 출력 단자에 연결되는 애노드(anode)와 공통전극(80)에 연결되어 있는 캐소드(cathode)를 가진다. 유기발광소자(70)는 구동박막트랜지스터(50)의 출력 전류에 따라 세기를 달리하여 발광함으로써 영상을 표시한다. 구동박막트랜지스터(50)의 전류는 제어 단자와 출력 단자 사이에 걸리는 전압에 따라 그 크기가 달라진다.The organic light emitting diode 70 is provided in plural and has an anode connected to the output terminal of the driving thin film transistor 50 and a cathode connected to the common electrode 80. The organic light emitting diode 70 displays an image by emitting light at different intensities according to the output current of the driving thin film transistor 50. The current of the driving thin film transistor 50 varies in magnitude depending on the voltage applied between the control terminal and the output terminal.

유기발광소자(70)는 서로 다른 색의 빛을 발광하며, 서로 직렬로 연결되어 있는 제1유기발광소자(71)와, 제2유기발광소자(72)와, 제3유기발광소자(73)를 포함한다.The organic light emitting diode 70 emits light of different colors, and is connected to the first organic light emitting diode 71, the second organic light emitting diode 72, and the third organic light emitting diode 73. It includes.

도 1 및 도 2에 도시된 바와 같이, 제1유기발광소자(71)는 붉은색의 빛을 발광하는 제1발광층(71a)을 포함하고, 제2유기발광소자(72)는 녹색의 빛을 발광하는 제2발광층(72a)을 포함하며, 제3유기발광소자(73)는 파란색의 빛을 발광하는 제3발광층(73a)을 포함한다.As shown in FIGS. 1 and 2, the first organic light emitting diode 71 includes a first light emitting layer 71a for emitting red light, and the second organic light emitting diode 72 emits green light. The second light emitting layer 72a emits light, and the third organic light emitting device 73 includes a third light emitting layer 73a that emits blue light.

제1발광층(71a)과, 제2발광층(72a) 및 제3발광층(73a)은 두께 방향인 제1방향으로 순차적으로 적층되어 있다. 이 때, 제1발광층(71a)과, 제2발광층(72a) 및 제3발광층(73a)은 동일한 오픈마스크(open mask)를 이용하여 간단히 제조할 수 있다.The first light emitting layer 71a, the second light emitting layer 72a, and the third light emitting layer 73a are sequentially stacked in the first direction in the thickness direction. In this case, the first light emitting layer 71a, the second light emitting layer 72a, and the third light emitting layer 73a may be simply manufactured using the same open mask.

공통전극(80)은 유기발광소자(70)와 연결되어 있으며, 소정의 공통전압이 인가되어 있다.The common electrode 80 is connected to the organic light emitting diode 70 and a predetermined common voltage is applied.

스위칭부(90)는 제1박막트랜지스터(91)와, 제2박막트랜지스터(92)와, 제3박막트랜지스터(93)와, 제4박막트랜지스터(94)를 포함한다.The switching unit 90 includes a first thin film transistor 91, a second thin film transistor 92, a third thin film transistor 93, and a fourth thin film transistor 94.

스위칭부(90)는 각 박막트랜지스터를 온(on)/ 오프(off)함으로써, 제1유기발광소자(71)와, 제2유기발광소자(72) 및 제3유기발광소자(73)와 구동박막트랜지스터(50) 간의 연결 및 제1유기발광소자(71)와, 제2유기발광소자(72) 및 제3유기발광소자(73)와 공통전극(80) 간의 연결을 스위칭한다.The switching unit 90 drives the first organic light emitting element 71, the second organic light emitting element 72, and the third organic light emitting element 73 by turning on / off each thin film transistor. The connection between the thin film transistors 50 and the connection between the first organic light emitting device 71 and the second organic light emitting device 72 and the third organic light emitting device 73 and the common electrode 80 are switched.

제어부(100)는 제1유기발광소자(71)의 구동과, 제2유기발광소자(72)의 구동 및 제3유기발광소자(73)의 구동이 순차 및 반복되도록 스위칭부(90)를 제어한다.The controller 100 controls the switching unit 90 to sequentially and repeat the driving of the first organic light emitting element 71, the driving of the second organic light emitting element 72, and the driving of the third organic light emitting element 73. do.

이를 도 3 내지 도 6을 참조하여, 제어부(100)에 의한 제1프레임 내지 제3프레임 구동에 따른 스위칭부(90)의 온/ 오프를 설명한다. 각 프레임에서 스위칭박막트랜지스터(40)와 구동박막트랜지스터(50)는 온된다. 제1프레임 내지 제3프레임은 하나의 화소가 하나의 색상을 나타내는 것을 의미한다.3 to 6, the on / off of the switching unit 90 according to the driving of the first frame to the third frame by the controller 100 will be described. In each frame, the switching thin film transistor 40 and the driving thin film transistor 50 are turned on. The first to third frames mean that one pixel represents one color.

도 3에 도시된 바와 같이, 제1프레임에서는 제1박막트랜지스터(91) 내지 제3박막트랜지스터(93)는 오프되고, 제4박막트랜지스터(94)는 온된다.As illustrated in FIG. 3, in the first frame, the first thin film transistors 91 to the third thin film transistors 93 are turned off and the fourth thin film transistor 94 is turned on.

이에 의해 도4에 도시된 바와 같이, 구동전압선(30)에 인가된 구동전류는 구동박막트랜지스터(50) - 제1유기발광소자(71) - 제4박막트랜지스터(94) - 공통전 극(80) 순으로 이동한다. 이 때, 제1유기발광소자(71)는 붉은색의 빛을 발광한다.As a result, as shown in FIG. 4, the driving current applied to the driving voltage line 30 is driven by the driving thin film transistor 50-the first organic light emitting element 71-the fourth thin film transistor 94-the common electrode 80 ) In order. At this time, the first organic light emitting element 71 emits red light.

제2프레임에서는 제1박막트랜지스터(91) 및 제4박막트랜지스터(94)는 오프되고, 제2박막트랜지스터(92) 및 제3박막트랜지스터(93)는 온된다.In the second frame, the first thin film transistor 91 and the fourth thin film transistor 94 are turned off, and the second thin film transistor 92 and the third thin film transistor 93 are turned on.

이에 의해 도5에 도시된 바와 같이, 구동전압선(30)에 인가된 구동전류는 구동박막트랜지스터(50) - 제2박막트랜지스터(92) - 제2유기발광소자(72) - 제3박막트랜지스터(93) - 공통전극(80) 순으로 이동한다. 이 때 제2유기발광소자(72)는 녹색의 빛을 발광한다.As a result, as shown in FIG. 5, the driving current applied to the driving voltage line 30 is driven by the driving thin film transistor 50-the second thin film transistor 92-the second organic light emitting element 72-the third thin film transistor ( 93)-move to the common electrode 80; At this time, the second organic light emitting element 72 emits green light.

제3프레임에서는 제2박막트랜지스터(92) 내지 제4박막트랜지스터(94)는 오프되고, 제1박막트랜지스터(91)는 온된다.In the third frame, the second thin film transistors 92 to the fourth thin film transistor 94 are turned off, and the first thin film transistor 91 is turned on.

이에 의해 도6에 도시된 바와 같이, 구동전압선(30)에 인가된 구동전류는 구동박막트랜지스터(50) - 제1박막트랜지스터(91) - 제3유기발광소자(73) - 공통전극(80) 순으로 이동한다. 이 때 제3유기발광소자(73)는 파란색의 빛을 발광한다.As a result, as shown in FIG. 6, the driving current applied to the driving voltage line 30 is the driving thin film transistor 50-the first thin film transistor 91-the third organic light emitting element 73-the common electrode 80. Go in order. At this time, the third organic light emitting element 73 emits blue light.

이상 설명한 바와 같이, 제어부(100)는 스위칭부(90)를 제어하여 제1프레임 내지 제3프레임을 순차 및 반복하여 유기발광소자(70)로부터 붉은색의 빛과 녹색의 빛과 파란색의 빛을 순차 및 반복적으로 발광시킨다.As described above, the controller 100 controls the switching unit 90 to sequentially and repeat the first frame to the third frame to emit red light, green light, and blue light from the organic light emitting diode 70. It emits light sequentially and repeatedly.

또한, 제어부(100)는 제1유기발광소자(71)의 구동과, 제2유기발광소자(72)의 구동과, 제3유기발광소자(73)의 구동과, 제1유기발광소자(71)와 제2유기발광소자(72)와 제3유기발광소자(73)의 동시 구동이 순차 및 반복되도록 스위칭부(90)를 제어한다In addition, the control unit 100 drives the first organic light emitting element 71, the second organic light emitting element 72, the third organic light emitting element 73, and the first organic light emitting element 71. ) And the switching unit 90 so that simultaneous driving of the second organic light emitting device 72 and the third organic light emitting device 73 is sequentially and repeated.

이를 도 7 및 도 8을 참조하여, 제어부(100)에 의한 제1프레임 내지 제4프 레임 구동에 따른 스위칭부(90)의 온/ 오프를 설명한다. 각 프레임에서 스위칭박막트랜지스터(40)와 구동박막트랜지스터(50)는 온된다. 제1프레임 내지 제4프레임은 하나의 화소가 하나의 색상을 나타내는 것을 의미한다.7 and 8, the on / off of the switching unit 90 according to the first to fourth frame driving by the controller 100 will be described. In each frame, the switching thin film transistor 40 and the driving thin film transistor 50 are turned on. The first to fourth frames mean that one pixel represents one color.

제1프레임 내지 제3프레임은 전술하였다.The first to third frames have been described above.

도 7에 도시된 바와 같이, 제4프레임에서는 제1박막트랜지스터(91) 내지 제4박막트랜지스터(94)는 오프된다.As shown in FIG. 7, in the fourth frame, the first thin film transistors 91 to 4 th are turned off.

이에 의해 도8에 도시된 바와 같이, 구동전압선(30)에 인가된 구동전류는 구동박막트랜지스터(50) - 제1유기발광소자(71) - 제2유기발광소자(72) - 제3유기발광소자(73) - 공통전극(80) 순으로 이동한다. 이 때, 제1유기발광소자(71)가 발광하는 붉은색의 빛과, 제2유기발광소자(72)가 발광하는 녹색의 빛과, 제3유기발광소자(73)가 발광하는 파란색의 빛이 혼합되어 백색의 빛을 발광한다.As a result, as shown in FIG. 8, the driving current applied to the driving voltage line 30 is the driving thin film transistor 50-the first organic light emitting element 71-the second organic light emitting element 72-the third organic light emitting element. The device 73 moves in the order of the common electrode 80. At this time, red light emitted by the first organic light emitting element 71, green light emitted by the second organic light emitting element 72, and blue light emitted by the third organic light emitting element 73 are emitted. It is mixed to emit white light.

이상 설명한 바와 같이, 제어부(100)는 스위칭부(90)를 제어하여 제1프레임 내지 제4프레임을 순차 및 반복하여 유기발광소자(70)로부터 붉은색의 빛과 녹색의 빛과 파란색의 빛과 백색의 빛을 순차 및 반복적으로 발광시킨다.As described above, the control unit 100 controls the switching unit 90 to sequentially and repeat the first to fourth frames, and the red light, the green light, and the blue light and the like from the organic light emitting diode 70. White light is emitted sequentially and repeatedly.

이상 설명한 본 발명의 일 실시예에 따른 유기전계발광장치의 효과를 설명한다.The effect of the organic light emitting display device according to the embodiment of the present invention described above will be described.

기존에 유기발광소자가 백색의 빛을 발광할 경우, 유기전계발광장치는 유기발광소자에서 발광된 백색의 빛의 색을 변화시키기 위해 컬러필터와 같은 색변환부재를 포함하였다. 유기발광소자에서 발광된 백색의 빛은 색변환부재를 지나면서 광효율이 감소한다.When the organic light emitting device emits white light, the organic light emitting device includes a color conversion member such as a color filter to change the color of the white light emitted from the organic light emitting device. White light emitted from the organic light emitting device is reduced in light efficiency as it passes through the color conversion member.

그러나, 본 발명의 일 실시예에 따른 유기전계발광장치의 유기발광소자(70)는 붉은색의 빛과, 녹색의 빛과, 파란색의 빛과, 백색의 빛을 발광함으로써, 유기발광소자(70)에서 발광된 빛의 색 변환을 위한 색변환부재가 필요하지 않다.However, the organic light emitting device 70 of the organic light emitting device according to the embodiment of the present invention emits red light, green light, blue light, and white light, thereby emitting an organic light emitting device 70. There is no need for a color conversion member for the color conversion of the light emitted from.

이에 의해, 광효율이 향상된 유기전계발광장치가 제공된다.Thereby, the organic electroluminescent device with improved light efficiency is provided.

또한, 기존에 유기발광소자가 붉은색의 빛과, 녹색의 빛 및 파란색의 빛을 발광할 경우, 추가적인 쉐도우마스크를 이용하여 화소를 분할하는 미세 패터닝을 하였다.In addition, when the organic light emitting device emits red light, green light and blue light, fine patterning for dividing pixels is performed by using an additional shadow mask.

그러나, 본 발명의 일 실시예에 따른 유기전계발광장치의 유기발광소자(70)는 제1발광층(71a)과, 제2발광층(72a) 및 제3발광층(73a)을 동일한 오픈마스크(open mask)를 이용하여 간단히 제조할 수 있다.However, in the organic light emitting diode 70 of the organic light emitting device according to the embodiment of the present invention, the first light emitting layer 71a, the second light emitting layer 72a and the third light emitting layer 73a have the same open mask. Can be prepared simply.

이에 의해, 제조가 간단한 유기전계발광장치가 제공된다Thereby, the organic electroluminescent device which is easy to manufacture is provided.

비록 본 발명의 실시예가 도시되고 설명되었지만, 본 발명이 속하는 기술분야의 통상의 지식을 가진 당업자라면 본 발명의 원칙이나 정신에서 벗어나지 않으면서 본 실시예를 변형할 수 있음을 알 수 있을 것이다. 본 발명의 범위는 첨부된 청구항과 그 균등물에 의해 정해질 것이다.Although embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that the present embodiments may be modified without departing from the spirit or spirit of the invention. It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents.

이상 설명한 바와 같이, 본 발명에 따르면, 제조가 간단하면서 광효율이 향상된 유기전계발광장치가 제공된다.As described above, according to the present invention, there is provided an organic light emitting display device which is simple in production and has improved light efficiency.

Claims (5)

유기전계발광장치에 있어서,In the organic electroluminescent device, 구동박막트랜지스터와;A driving thin film transistor; 상기 구동박막트랜지스터에 직렬로 연결되어 있는 복수의 유기발광소자와;A plurality of organic light emitting elements connected in series with the driving thin film transistor; 상기 유기발광소자에 연결되어 있는 공통전극과;A common electrode connected to the organic light emitting diode; 상기 각 유기발광소자와 상기 구동박막트랜지스터 간의 연결 및 상기 각 유기발광소자와 상기 공통전극 간의 연결을 스위칭하는 스위칭부와;A switching unit for switching a connection between each of the organic light emitting diodes and the driving thin film transistor and a connection between each of the organic light emitting diodes and the common electrode; 상기 복수의 유기발광소자가 순차 및 반복적으로 구동되도록, 상기 스위칭부를 제어하는 제어부를 포함하는 것을 특징으로 하는 유기전계발광장치.And a control unit for controlling the switching unit so that the plurality of organic light emitting elements are sequentially and repeatedly driven. 제1항에 있어서,The method of claim 1, 상기 복수의 유기발광소자는 서로 다른 색의 빛을 발광하는 제1유기발광소자와, 제2유기발광소자와, 제3유기발광소자를 포함하는 것을 특징으로 하는 유기전계발광장치.The organic light emitting device includes a first organic light emitting device for emitting light of different colors, a second organic light emitting device, and a third organic light emitting device. 제2항에 있어서,The method of claim 2, 상기 제1유기발광소자는 붉은색의 빛을 발광하는 제1발광층을 포함하고, 상기 제2유기발광소자는 녹색의 빛을 발광하는 제2발광층을 포함하고, 상기 제3유기발광소자는 파란색의 빛을 발광하는 제3발광층을 포함하는 것을 특징으로 하는 유 기전계발광장치.The first organic light emitting diode includes a first light emitting layer that emits red light, the second organic light emitting diode includes a second light emitting layer that emits green light, and the third organic light emitting device has a blue color. An organic electroluminescent device comprising a third light emitting layer for emitting light. 제3항에 있어서,The method of claim 3, 상기 제1발광층과 상기 제2발광층과 상기 제3발광층은 두께방향으로 순차적으로 적층되어 있는 것을 특징으로 하는 유기전계발광장치.And the first light emitting layer, the second light emitting layer and the third light emitting layer are sequentially stacked in the thickness direction. 제2항 내지 제4항 중 어느 한 항에 있어서,The method according to any one of claims 2 to 4, 상기 제어부는 상기 제1유기발광소자의 구동과, 상기 제2유기발광소자의 구동과, 상기 제3유기발광소자의 구동과, 상기 제1유기발광소자와 상기 제2유기발광소자와 상기 제3유기발광소자의 동시 구동이 순차 및 반복되도록 상기 스위칭부를 제어하는 것을 특징으로 하는 유기전계발광장치.The controller is configured to drive the first organic light emitting device, the second organic light emitting device, the third organic light emitting device, the first organic light emitting device, the second organic light emitting device, and the third organic light emitting device. An organic electroluminescence device, characterized in that for controlling the switching unit so that simultaneous driving of the organic light emitting device is sequentially and repeated.
KR1020070016631A 2007-02-16 2007-02-16 Organic light emitting device Withdrawn KR20080076545A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102820006A (en) * 2012-08-02 2012-12-12 京东方科技集团股份有限公司 Pixel circuit for compensating shift of threshold voltage and thin film transistor backplane
CN111081889A (en) * 2019-11-21 2020-04-28 武汉华星光电半导体显示技术有限公司 Lighting device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102820006A (en) * 2012-08-02 2012-12-12 京东方科技集团股份有限公司 Pixel circuit for compensating shift of threshold voltage and thin film transistor backplane
CN102820006B (en) * 2012-08-02 2015-10-14 京东方科技集团股份有限公司 A kind of image element circuit of compensating threshold voltage drift and thin film transistor backplane
CN111081889A (en) * 2019-11-21 2020-04-28 武汉华星光电半导体显示技术有限公司 Lighting device
CN111081889B (en) * 2019-11-21 2022-05-31 武汉华星光电半导体显示技术有限公司 Lighting device

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