KR20060023730A - Manufacturing method and driving method of plane organic light-emitting device - Google Patents
Manufacturing method and driving method of plane organic light-emitting device Download PDFInfo
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Abstract
본 발명은 유기 전계 발광 소자의 면광원을 구동함에 있어서 휘도 균일성을 확보함과 동시에 고휘도, 수명향상에 관한 것이다.The present invention relates to ensuring luminance uniformity and improving high luminance and lifetime in driving a surface light source of an organic EL device.
통상적으로 유기 전계 발광 소자의 면광원은 크게 양전극, 유기물층, 음전극으로 구성되어 있다. 일반적으로 양전극에 + 전원을, 음전극에 - 전원을 인가하여 발광시킨다. 이때, 양전극 음전극 각각 한쪽씩만 전원을 인가하면 양전극 근처부터 유기 전계 발광 소자의 휘도의 불균일, 수명 감소 현상이 나타난다.In general, the surface light source of the organic EL device is largely composed of a positive electrode, an organic material layer, and a negative electrode. In general, positive power is applied to the positive electrode and negative power is applied to the negative electrode. At this time, if only one of each of the positive electrode negative electrode is applied to the power, the non-uniformity of the luminance of the organic electroluminescent device and the reduction of the lifetime appear.
본 발명은 상기와 같은 문제점을 해결하기 위하여 유기 전계 발광 소자의 양전극, 음전극 끝단에 각각 전원을 인가하여 휘도의 균일성을 확보하고, 고휘도, 수명향상 등을 특징으로 한다.The present invention is to solve the above problems by applying power to the positive electrode and the negative electrode end of the organic light emitting device, respectively, to ensure the uniformity of the brightness, it characterized by high brightness, life improvement.
OLED, 면광원, BLU, 구동, 균일한 휘도, 장수명,OLED, surface light source, BLU, driving, uniform brightness, long life,
Description
도 1a는 종래의 유기 전계 발광 소자 구조를 나타낸 개략도 1A is a schematic diagram showing a structure of a conventional organic EL device
도 1b는 종래의 유기 전계 발광 소자의 면광원 구동 상태를 도시한 개략도 1B is a schematic diagram showing a surface light source driving state of a conventional organic EL device
도 2a는 본 발명의 유기 전계 발광 소자 구조를 나타낸 개략도 2A is a schematic diagram showing the structure of an organic EL device of the present invention
도 2b는 본 발명의 유기 전계 발광 소자의 면광원 구동 상태를 도시한 개략도2B is a schematic diagram showing a surface light source driving state of the organic EL device of the present invention;
도 3은 본 발명에 사용한 ITO 패턴과 보조전극 패턴을 나타낸 개략도3 is a schematic view showing an ITO pattern and an auxiliary electrode pattern used in the present invention
도 4는 일반적인 면광원으로의 유기 전계 발광 소자가 발광할 때의 사진4 is a photograph when an organic electroluminescent element to a general surface light source emits light
도 5는 본 발명에 따른 전극패턴을 이용하여 제작한 유기 전계 발광 소자가 발광할 때의 사진5 is a photograph when the organic electroluminescent device manufactured using the electrode pattern according to the present invention emits light
본 발명은 유기 전계 발광 소자의 면광원을 구동함에 있어서 휘도 균일성을 확보함과 동시에 고휘도, 수명향상에 관한 것이다.The present invention relates to ensuring luminance uniformity and improving high luminance and lifetime in driving a surface light source of an organic EL device.
통상적으로 유기 전계 발광 소자는 도 1a, 도1b에서와 같이 유리, 가요성 필름 등과 같은 투명한 기판 위에 양전극인 ITO(Indium-tin-oxide)를 스퍼터 방식으로 증착하고, 그 상면에 발광 유기물질 및 음전극인 알루미늄(Al) 등과 같은 금속을 진공 열증착하여 제작한다. 또한 유기 전계 발광 소자 면광원의 구동은 도 1a, 도 1b에서와 같이 양전극에는 + 전원을 음전극에는 - 전원을 인가하면 발광층에서 빛이 나와 투명기판을 향해 나간다. In general, an organic electroluminescent device is formed by sputtering a positive electrode of indium-tin-oxide (ITO) on a transparent substrate such as glass or a flexible film as shown in FIGS. 1A and 1B, and a light emitting organic material and a negative electrode on the upper surface thereof. A metal such as phosphorous aluminum (Al) is produced by vacuum thermal deposition. In addition, the driving of the surface light source of the organic EL device is that when + power is applied to the positive electrode and-power is applied to the negative electrode, as shown in FIGS. 1A and 1B, light is emitted from the light emitting layer and goes toward the transparent substrate.
상기 도 1a, 도 1b와 같이 구동을 하면 양전극인 ITO와 음전극인 금속전극이 만나는 부분이 휘도가 가장 밝고, 양전극에서 멀어질수록 휘도가 감소된다. 그 이유는 양전극인 ITO의 면저항값이 약 10Ω/□ 로 정공 주입이 + 전원 근처에는 잘 되다가 멀어질수록 ITO 면저항에 의하여 정공 주입이 안 되어 휘도 불균일이 일어난다. 휘도 불균일이 일어나면 고휘도를 내기가 어려울뿐만 아니라 유기 전계 발광 소자의 수명에도 악영향을 끼친다.As shown in FIGS. 1A and 1B, the brightness of the portion where the positive electrode ITO and the negative electrode metal electrode meet is the brightest and decreases as the distance from the positive electrode increases. The reason for this is that the sheet resistance of the positive electrode ITO is about 10 mA / square, and the hole injection becomes good near the + power supply, and as the distance increases, the hole injection is not performed by the ITO sheet resistance, resulting in uneven luminance. When the luminance nonuniformity occurs, it is difficult to produce high luminance, and also adversely affects the life of the organic EL device.
본 발명에서는 상기와 같은 문제점을 해결하기 위하여 도 2a, 도 2b와 같이 유기 전계 발광 소자의 양전극인 ITO 양 끝단에 + 전원을 인가하고, 음전극인 금속의 양 끝단에 - 전원을 인가하여 휘도의 균일성을 확보함과 동시에 고휘도, 수명 향상 등을 목적으로 하고 있다. In the present invention, in order to solve the above problems, + power is applied to both ends of ITO, which is the positive electrode of the organic electroluminescent device, and-power is applied to both ends of the metal, which is the negative electrode, as shown in FIGS. 2A and 2B. It aims to ensure the high performance and to improve the brightness and life.
본 발명의 다른 목적은 도 3에서와 같이 양전극인 ITO 상면에 저항값이 낮은 보조전극을 삽입하여 ITO의 면저항값을 낮춰 휘도의 균일성 확보, 고휘도, 수명향 상 등을 목적으로 하고 있다.
Another object of the present invention is to insert a secondary electrode having a low resistance value on the upper surface of the ITO, which is a positive electrode, to lower the sheet resistance of the ITO, thereby ensuring uniformity of luminance, high luminance, and improvement of lifetime.
이하, 본 발명에 의한 유기 전계 발광 소자 면광원 제작방법 및 구동방법을 바람직한 실시예를 첨부한 도면을 참조하여 구체적으로 설명한다.Hereinafter, a method and a method of manufacturing an organic EL device surface light source according to the present invention will be described in detail with reference to the accompanying drawings.
도 2a는 본 발명의 실시예에 따른 면광원을 위한 유기 전계 발광 소자를 도시한 것이다. 하기 실시예에서는 녹색 발광 유기 전계 발광 소자 제작 방법에 대해 기술하였다. 2A illustrates an organic electroluminescent device for a surface light source according to an embodiment of the present invention. In the following example, a method of fabricating a green light emitting organic electroluminescent device was described.
상기 유기 발광 소자의 제작 방법은 다음과 같다. The manufacturing method of the organic light emitting device is as follows.
먼저 투명 기판 위에 양전극으로 ITO(indium tin oxide)와 같은 투명한 도전막을 형성한다. 이어서, 상기 투명 전극 위에 도 3과 같이 저항값이 낮은 보조 전극을 형성한다. 이어서, 상기 투명 전극이 형성된 기판 위에 포토레지스트(Photo Resist : PR), SiOX, SiNX 등의 투명 절연체 등을 이용하여 소정의 패턴으로 절연막을 형성한 후 높은 일함수를 얻기 위하여 대기압 또는 진공 상태에서 산소 및 질소 이온으로 일정 시간동안 플라즈마 처리한다. 상기 플라즈마 처리한 투명 전극 위에 유기 발광층을 구성한다. First, a transparent conductive film such as indium tin oxide (ITO) is formed on the transparent substrate as a positive electrode. Subsequently, an auxiliary electrode having a low resistance value is formed on the transparent electrode as shown in FIG. 3. Subsequently, an insulating film is formed in a predetermined pattern by using a transparent insulator such as photoresist (PR), SiO X , SiN X, or the like on the substrate on which the transparent electrode is formed, and then at atmospheric pressure or in vacuum to obtain a high work function. Plasma treatment with oxygen and nitrogen ions for a period of time. An organic light emitting layer is formed on the plasma-treated transparent electrode.
상기 유기 발광층의 구조는 다음과 같다.The structure of the organic light emitting layer is as follows.
도 2a와 같이 상기 투명 양전극이 형성된 기판 위에 CuPC, MTDATA 등의 유기 막으로 된 100Å의 정공 주입층과 NPB, TPD 등의 유기막으로 된 500Å의 정공 수송층과 Alq3 혹은 Alq3:C545T(0.5%) 등으로 된 300Å의 녹색(Green) 발광층과 Alq3 로 된 300Å의 전자 수송층과 LiF, BCP:Cs로 된 5Å의 전자 주입층을 진공 열 증착법으로 연속 증착하여 유기 발광층을 구성한다. As shown in FIG. 2A, a hole injection layer of 100 μs made of an organic film such as CuPC and MTDATA, a hole transport layer of 500 μs made of an organic film such as NPB, TPD, and Alq 3 or Alq 3 : C545T (0.5%) are formed on a substrate on which the transparent positive electrode is formed. An organic light emitting layer is formed by successively depositing a 300 녹색 green light emitting layer made of 3) , a 300 전자 electron transport layer made of Alq 3 , and a 5 전자 electron injection layer made of LiF, BCP: Cs by vacuum thermal evaporation.
이어서, 상기 유기 발광층 위에 알루미늄 1000Å의 음전극을 형성한다. 상기 음전극이 형성된 기판 위에는 발광 소자를 보호하고 방습기능을 겸하는 한층 이상의 보호막을 구성할 수 있다. 본 실시예에서는 상기 보호막을 NPB, Alq3 등의 투명 유기막 혹은 SiN, SiON 등으로 된 투명 무기막을 이용하여 각각 1000Å의 두께로 형성하였다.Subsequently, a negative electrode of 1000 Å aluminum is formed on the organic light emitting layer. On the substrate on which the negative electrode is formed, one or more protective films may be formed to protect the light emitting device and serve as a moisture proof function. In this embodiment, the protective films were formed to have a thickness of 1000 kPa using transparent organic films made of NPB, Alq 3 or the like, or transparent inorganic films made of SiN, SiON or the like.
상기와 같이 제작한 유기 전계 발광 소자를 구동하기 위하여, 투명 양전극인 ITO 양끝단에 + 전원을 인가하고, 음전극인 알루미늄 양끝단에 - 전원을 인가한다. 상기 유기 전계 발광 소자 면광원의 양전극과 음전극에 가하는 전원은 펄스 전압 또는 펄스 전류, 직류 전압, 직류 전류 등의 전원를 인가하는 것을 특징으로 한다.In order to drive the organic electroluminescent device fabricated as described above, + power is applied to both ends of ITO which are transparent positive electrodes, and-power is applied to both ends of aluminum which are negative electrodes. The power applied to the positive electrode and the negative electrode of the surface of the organic light emitting device is characterized in that the power supply such as pulse voltage or pulse current, direct current voltage, direct current.
도 4는 일반적인 면광원으로의 유기 전계 발광 소자가 발광할 때의 사진이고, 도 5는 본 발명에 따른 전극패턴을 이용하여 제작한 유기 전계 발광 소자의 발광 사진을 나타낸 것이다. 4 is a photograph when an organic EL device emits light as a general surface light source, and FIG. 5 is a photograph showing an emission picture of an organic EL device manufactured using an electrode pattern according to the present invention.
도 4와 도 5에서 볼 수 있듯이, 일반적인 유기 전계 발광 소자는 전원을 가하는 전극 쪽 부분이 밝게 빛나는 것을 볼 수 있지만, 본 발명에서 따른 전극패턴을 이용한 유기 전계 발광 소자는 균일한 휘도를 나타내는 것을 볼 수 있다. As can be seen in Figures 4 and 5, the general organic electroluminescent element can be seen that the electrode side to the power is bright shining, the organic electroluminescent element using the electrode pattern according to the present invention is seen to exhibit a uniform brightness Can be.
본 발명은 도면에 도시된 실시예를 참고로 설명되었으나 이는 예시적인 것에 불과하며, 본 기술 분야의 통상의 지식을 가진 자라면 이로부터 다양한 변형 및 균등한 타 실시예가 가능하다는 점을 이해할 것이다. 따라서, 본 발명의 진정한 기술적 보호 범위는 첨부된 등록청구범위의 기술적 사상에 의해 정해져야 할 것이다.Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.
이상에서 상술한 바와 같이 본 발명의 유기 전계 발광 소자 면광원 제작 방법 및 구동 방법에 대하여 다음과 같은 효과를 얻을 수 있다.As described above, the following effects can be obtained with respect to the method and the driving method of the organic EL device surface light source of the present invention.
첫째, 저항값이 낮은 보조 전극을 삽입함으로써 양전극인 ITO가 가지고 있는 면저항값을 낮춰 휘도의 균일성을 확보한다.First, by inserting an auxiliary electrode having a low resistance value, the sheet resistance value of the positive electrode ITO is lowered to ensure uniformity of luminance.
둘째, 양전극, 음전극 양 끝단에 각각 + 전원, - 전원을 인가하여 휘도의 균일성을 더욱 향상시켜 준다. Second, positive and negative powers are applied to both ends of the positive electrode and the negative electrode, respectively, to further improve the uniformity of luminance.
세째, 휘도의 균일성이 확보함에 따라 고휘도, 수명을 향상 시켜 준다.
Third, as the luminance uniformity is secured, it improves high brightness and lifespan.
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KR100739300B1 (en) * | 2006-07-31 | 2007-07-12 | 삼성에스디아이 주식회사 | Organic light emitting display device |
CN108767137A (en) * | 2018-08-17 | 2018-11-06 | 信利光电股份有限公司 | A kind of OLED light source and light-emitting device |
CN109065741A (en) * | 2018-08-17 | 2018-12-21 | 信利光电股份有限公司 | A kind of OLED light source and light emitting device |
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KR101369805B1 (en) | 2012-10-29 | 2014-03-06 | 네오뷰코오롱 주식회사 | Oled display panel having bus electrode layer |
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KR20000012579A (en) * | 1999-12-13 | 2000-03-06 | 박기점 | Chain led device for advertisement |
JP4620298B2 (en) * | 2001-07-23 | 2011-01-26 | パイオニア株式会社 | Silver or silver alloy wiring, method for forming the same, and display panel substrate |
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2004
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100739300B1 (en) * | 2006-07-31 | 2007-07-12 | 삼성에스디아이 주식회사 | Organic light emitting display device |
CN108767137A (en) * | 2018-08-17 | 2018-11-06 | 信利光电股份有限公司 | A kind of OLED light source and light-emitting device |
CN109065741A (en) * | 2018-08-17 | 2018-12-21 | 信利光电股份有限公司 | A kind of OLED light source and light emitting device |
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