KR100753866B1 - Apparatus for displaying oled using zener diode - Google Patents

Apparatus for displaying oled using zener diode Download PDF

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KR100753866B1
KR100753866B1 KR1020060040761A KR20060040761A KR100753866B1 KR 100753866 B1 KR100753866 B1 KR 100753866B1 KR 1020060040761 A KR1020060040761 A KR 1020060040761A KR 20060040761 A KR20060040761 A KR 20060040761A KR 100753866 B1 KR100753866 B1 KR 100753866B1
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zener diode
zener
oled
voltage
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장진호
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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
    • G09G3/3291—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
    • 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]
    • G09G3/3216—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 a passive matrix
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • 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
    • H10K59/17—Passive-matrix OLED displays
    • 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
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Control Of El Displays (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

An OLED(Organic Light Emitting Diode) display device using a zener diode is provided to reduce power consumption of an OLED panel by preventing a voltage from being applied under scan lines turned on when a voltage per step is applied to a data line. An OLED display device includes a bottom electrode layer, an emission layer and a top electrode layer. A zener diode layer acting as a zener diode(21) is formed on a partial layer between the bottom electrode layer and the top electrode layer. The zener diode layer is formed by stacking a zener N layer and a zener P layer.

Description

제너 다이오드를 이용한 ＯＬＥＤ 표시 장치{APPARATUS FOR DISPLAYING OLED USING ZENER DIODE}OLED display using Zener diodes {APPARATUS FOR DISPLAYING OLED USING ZENER DIODE}

도 1 은 기존의 OLED 표시 장치를 도시한 블럭도.1 is a block diagram showing a conventional OLED display.

도 2 는 기존의 OLED 표시 장치의 각 픽셀의 구성을 보인 도면.2 is a view showing the configuration of each pixel of a conventional OLED display.

도 3은 본 발명에 의한 제너 다이오드를 이용한 OLED 표시 장치의 각 픽셀의 구성을 보인 도면.3 is a view showing the configuration of each pixel of an OLED display device using a zener diode according to the present invention.

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

1 : 유기EL소자 1: organic EL element

2 : 유기EL패널2: organic EL panel

3, 3a, 3b, 3c, 3d, 3e : 데이터선3, 3a, 3b, 3c, 3d, 3e: data line

4, 4a, 4b, 4c : 주사선4, 4a, 4b, 4c: scan line

5 : 데이터선구동회로5: Data line driving circuit

6 : 주사선구동회로6: scan line driving circuit

21 : 제너다이오드21: Zener Diode

22 : 커패시터22: capacitor

본 발명은 제너 다이오드를 이용한 OLED 표시 장치에 관한 것으로, 더 상세하게는 수동형 메트릭스 OLED 패널 상의 주사선 단위로 제너 전압이 다른 제너 다이오드를 각 픽셀에 추가하여 구성함으로써 데이터 라인에 단계별 전압 인가시 턴 온 되는 주사선 아래로는 전압이 인가되지 않도록 하여 OLED 패널의 소비전력을 감소시키는 제너 다이오드를 이용한 OLED 표시 장치에 관한 것이다.The present invention relates to an OLED display device using a zener diode, and more particularly, by adding a zener diode having a different zener voltage to each pixel in units of scan lines on a passive matrix OLED panel, the pixel is turned on when voltage is applied stepwise to a data line. The present invention relates to an OLED display device using a zener diode which reduces power consumption of an OLED panel by preventing a voltage from being applied below the scan line.

일반적으로 OLED(ORGANIC LIGHT EMITTING DIODES) 소자들을 사용하는 발광표시장치에서는 OLED소자들이 매트릭스형태로 배치된다. OLED소자들은 예를들면, 행들의 소자들을 주사선구동회로(행구동회로)에 의해 열방향으로 순차적으로 주사하고 행구동회로에 의해 선택된 특정 행의 소자들에 구동전류를 선택적으로 공급함으로써 발광된다. 구동전류는 데이터선 구동회로(열구동회로)에 의해 공급된다. 이러한 OLED 표시장치는 백라이트(backlight)를 요하지 않는 자가발광표시장치로서 대중의 이목을 끌어왔다.In general, in a light emitting display device using OLED (ORGANIC LIGHT EMITTING DIODES) devices, OLED devices are arranged in a matrix form. OLED elements are emitted by, for example, sequentially scanning the elements of the rows in the column direction by the scan line driver circuit (row driver circuit) and selectively supplying the driving current to the elements of a particular row selected by the row driver circuit. The drive current is supplied by the data line drive circuit (column drive circuit). Such OLED displays have attracted the public's attention as self-luminous displays that do not require backlight.

도 1 은 기존의 OLED 표시 장치를 도시한 블럭도이고, 도 2는 기존의 OLED 표시 장치의 각 픽셀의 구성을 보인 도면이다. 복수개의 OLED 소자들(1)이 매트릭스형태로 배치되어 OLED 패널(2)을 형성한다. 단순화를 위해, 각각의 OLED 소자(1)는 도 1에 다이오드만으로 구성된 것으로 보여졌다. 그러나, 각 OLED 소자(1)는 도 2 에 도시한 바와 같이 그 소자(1)와 병렬로 배치된 기생커패시터를 구비하며, 이 기생커패시터는 소자(1)를 통해 흐르는 전류에 대하여 매우 큰 기생용량을 가진다.FIG. 1 is a block diagram illustrating a conventional OLED display, and FIG. 2 is a diagram illustrating a configuration of each pixel of the conventional OLED display. A plurality of OLED elements 1 are arranged in a matrix to form an OLED panel 2. For the sake of simplicity, each OLED element 1 is shown as consisting only of diodes in FIG. 1. However, each OLED element 1 has a parasitic capacitor arranged in parallel with the element 1 as shown in FIG. 2, which has a very large parasitic capacitance with respect to the current flowing through the element 1. Has

도 1에 도시된 바와 같이, 각 열의 유기EL소자들(1)은 그것들의 애노드들에 의해 각 데이터선(3; 3a, 3b, 3c, 3d, 3e, 등)에 연결된다. 데이터선들(3)은 열구동회로(5)에 연결된다. 각 행의 유기EL소자들(1)은 그것들의 캐소드들에 의해 각 주사선(4; 4a, 4b, 4c, 4d, 등)에 연결된다. 주사선들(4)은 행구동회로(6)에 연결된다. 데이터선들(3)은 분로(shunt)스위치들(7; 7a, 7b, 7c, 7e, 등)을 통해 접지레벨에 선택적으로 접속될 수 있다. 열구동회로(5)에서, 각 신호전류원(8)은 구동스위치들(9; 9a, 9b, 9c, 9d, 9e, 등)을 통해 데이터선(3)에 연결된다.As shown in Fig. 1, the organic EL elements 1 in each column are connected to each data line 3 (3a, 3b, 3c, 3d, 3e, etc.) by their anodes. The data lines 3 are connected to the column drive circuit 5. The organic EL elements 1 in each row are connected to each scan line 4 (4a, 4b, 4c, 4d, etc.) by their cathodes. The scan lines 4 are connected to the row drive circuit 6. The data lines 3 may be selectively connected to the ground level through shunt switches 7 (7a, 7b, 7c, 7e, etc.). In the column drive circuit 5, each signal current source 8 is connected to the data line 3 through drive switches 9 (9a, 9b, 9c, 9d, 9e, etc.).

각 주사선(4)은 행구동회로(6)의 복수개의 주사스위치들(10a, 10b, 10c, 10d, 등)로 된 주사스위치(10)에 연결된다. 주사선들(4)은 주사스위치들(10)을 통해 전원(V2) 또는 접지레벨에 선택적으로 접속된다. 열구동회로(5)의 구동스위치들(9), 행구동회로(6)의 주사스위치들(10) 및 분로스위치들(7)은 제어회로(11)에 의해 제어된다.Each scan line 4 is connected to a scan switch 10 made up of a plurality of scan switches 10a, 10b, 10c, 10d, etc. of the row drive circuit 6. The scan lines 4 are selectively connected to the power supply V2 or ground level via the scan switches 10. The drive switches 9 of the column drive circuit 5, the scan switches 10 and the shunt switches 7 of the row drive circuit 6 are controlled by the control circuit 11.

이러한 구성을 갖는 기존의 유기EL표시장치에서, 제어회로(11)는 영상표시데이터를 수신하며 주사선들(4)을 연속적으로 주사하도록 행구동회로(6)를 제어한다. 주사선(4)이 선택된 동안, 열구동회로(5)는 소정의 전류를 구동전류로 하여 특정한 선택된 데이터선(3)에 공급한다.In the existing organic EL display device having such a configuration, the control circuit 11 receives the image display data and controls the row driving circuit 6 to continuously scan the scanning lines 4. While the scan line 4 is selected, the column drive circuit 5 supplies a predetermined current as a drive current to the specific selected data line 3.

이런 식으로, 선택된 주사선(4)에 연결된 유기EL소자(1)는 발광된다. 예를 들면, 행구동회로(6)가 주사선(4b)을 주사하는 동안, 주사선(4b)에 연결된 유기EL 소자들(1) 중에서 데이터선들(3b 및 3c)에 연결된 유기EL소자들(1)은, 행구동회로(6)를 제어하여 주사스위치들(10b)을 접지측으로 절환하고 다른 주사선들(4a, 4c, 4d, 4e, 등)에 연결된 주사스위치들(10a, 10c, 10d, 10e, 등)을 전원(V2)측으로 절환함으로써 발광 될 수 있다. In this way, the organic EL element 1 connected to the selected scan line 4 emits light. For example, while the row driving circuit 6 scans the scanning line 4b, of the organic EL elements 1 connected to the scanning line 4b, the organic EL elements 1 connected to the data lines 3b and 3c are selected. Control the row drive circuit 6 to switch the scan switches 10b to the ground side and scan switches 10a, 10c, 10d, 10e, etc. connected to the other scan lines 4a, 4c, 4d, 4e, etc. Can be emitted by switching to the power supply V2 side.

열구동회로(5)는 분로스위치들(7b 및 7c)을 턴오프시키고 구동스위치들(9b 및 9c)을 턴온시켜 신호전류원(8)으로부터의 전원(V1)을 데이터선들(3b 및 3c)에 인가한다.The column drive circuit 5 turns off the shunt switches 7b and 7c and turns on the drive switches 9b and 9c to connect the power supply V1 from the signal current source 8 to the data lines 3b and 3c. Is authorized.

그 때 열구동회로(5)는 분로스위치들(7a, 7d, 7e, 등)을 턴온시키고 구동스위치들(9a, 9d 및 9e)을 턴오프시켜 데이터선들(3a, 3d 및 3e)을 접지에 접속시킨다. 이와 동시에, 주사선(4b)은 접지전위로 된다. 이런 식으로, 전원(V1) 및 접지간의 전위차에 기초하여, 신호전류원(8)으로부터 데이터선들(3b 및 3c)로 공급된 구동전류는, 데이터선들(3b 및 3c) 및 주사선(4b) 사이에 연결된 유기EL소자들(1)을 통해 흐른다. 이런 식으로 소자들(1)은 발광된다.The column drive circuit 5 then turns on the shunt switches 7a, 7d, 7e, etc. and turns off the drive switches 9a, 9d, and 9e to bring the data lines 3a, 3d and 3e to ground. Connect. At the same time, the scan line 4b becomes the ground potential. In this way, based on the potential difference between the power supply V1 and ground, the drive current supplied from the signal current source 8 to the data lines 3b and 3c is between the data lines 3b and 3c and the scanning line 4b. It flows through the connected organic EL elements (1). In this way, the elements 1 emit light.

데이터선들(3b 및 3c) 및 다른 주사선들(4a, 4c, 4d, 4e, 등)에 연결된 소자들(1)은 주사스위치들(10a, 10c, 10d, 10e)을 통해 전원(V2)에 접속되는 캐소드들을 가진다. 이런 식으로 전원(V1)은 데이터선들(3b 및 3c)을 통해 소자들(1)의 애노드들에 인가되고 전원(V2)은 역바이어스로서 주사선들(4a, 4c, 4d, 4e, 등)을 통해 소자들(1)의 캐소드들에 인가된다. 전원들(V1 및 V2)의 전압들이 유사한 레벨로 설정되므로, 그러한 소자들(1)의 애노드 및 캐소드 사이에 가해진 전위차는 없다. 결과적으로, 소자들(1)은 발광되지 않는다. 주사선(4b) 및 다른 데이터선들(3a, 3d, 3e, 등)에 연결된 유기EL소자들(1)은 그것들의 애노드들 및 캐소드들이 접지되고, 그것들 간에 전위차가 없다. 결과적으로, 이러한 소자들(1)은 발광되지 않는다.The elements 1 connected to the data lines 3b and 3c and the other scan lines 4a, 4c, 4d, 4e, etc. are connected to the power supply V2 via the scan switches 10a, 10c, 10d, 10e. Have cathodes. In this way, the power supply V1 is applied to the anodes of the elements 1 via the data lines 3b and 3c and the power supply V2 is the reverse bias to scan the lines 4a, 4c, 4d, 4e, and the like. Through the cathodes of the elements 1. Since the voltages of the power sources V1 and V2 are set to similar levels, there is no potential difference applied between the anode and the cathode of such elements 1. As a result, the elements 1 do not emit light. The organic EL elements 1 connected to the scanning line 4b and the other data lines 3a, 3d, 3e, etc. have their anodes and cathodes grounded and there is no potential difference between them. As a result, these elements 1 do not emit light.

전원(V2)은 캐소드들에 인가되고 접지전위는 다른 데이터선들(3a, 3d, 3e, 등) 및 다른 주사선들(4a, 4c, 4d, 등) 사이에 연결된 유기EL소자들(1)의 애노드들에 인가된다. 결과적으로, 역방향의 전위차가 이 소자들(1)에 가해진다. 그러므로, 전류가 그러한 소자들(1)을 통해 흐르지 않고, 그 소자들(1)은 밝아지지 않는다. 그러나, 역방향의 전위차가 그 소자들(1)에 가해지므로, 그 소자들(1)의 기생커패시터들은 도시된 소자들(1)의 기생커패시터들이 충전되는 방향에 역방향으로 충전된다.The power supply V2 is applied to the cathodes and the ground potential is the anode of the organic EL elements 1 connected between the other data lines 3a, 3d, 3e, etc. and the other scan lines 4a, 4c, 4d, etc. Is applied to the field. As a result, the reverse potential difference is applied to these elements 1. Therefore, no current flows through such elements 1, and the elements 1 do not brighten. However, since the reverse potential difference is applied to the elements 1, the parasitic capacitors of the elements 1 are charged in the reverse direction in the direction in which the parasitic capacitors of the elements 1 shown are charged.

전술한 바와 같이, 기존의 OLED 표시장치에서는, 주사동작이 하나의 주사선에서부터 다른 주사선으로 진행할 때, 주사선들(4a, 등) 모두와 데이터선들(3a, 등) 모두는 접지 또는 전원에 접속된다. 이런 식으로 유기EL패널(2)에 존재하는 기생커패시터들은 완전히 방전되고, 기생커패시터는 다음의 주사단계에서 0V로부터 발광이 얻어질 수 있는 전압으로 충전된다.As described above, in the conventional OLED display, when the scanning operation proceeds from one scan line to another scan line, all of the scan lines 4a and the like and all of the data lines 3a and the like are connected to ground or a power source. In this way, the parasitic capacitors present in the organic EL panel 2 are completely discharged, and the parasitic capacitors are charged to a voltage at which light emission can be obtained from 0 V in the next scanning step.

이처럼, 종래에는 이러한 기생 커패시터로 인해 OLED 패널의 소비전력이 많이 소모되는 문제점이 있었다.As such, in the related art, the parasitic capacitor has a problem in that power consumption of the OLED panel is consumed much.

본 발명은 상기와 같은 종래 기술의 문제점을 해결하기 위해 창안된 것으로, 수동형 메트릭스 OLED 패널 상의 주사선 단위로 제너 전압이 다른 제너 다이오드를 각 픽셀에 추가하여 구성함으로써 데이터 라인에 단계별 전압 인가시 턴 온 되는 주사선 아래로는 전압이 인가되지 않도록 하여 OLED 패널의 소비전력을 감소시키는 제너 다이오드를 이용한 OLED 표시 장치를 제공하는데 그 목적이 있다.The present invention was devised to solve the above-described problems of the prior art, and is formed by adding a zener diode having a different zener voltage to each pixel in units of scan lines on a passive matrix OLED panel, thereby being turned on when voltage is applied stepwise to a data line. It is an object of the present invention to provide an OLED display device using a zener diode which reduces power consumption of the OLED panel by preventing a voltage from being applied below the scan line.

상기와 같은 목적을 달성하기 위한 본 발명은 하부전극층, 발광층, 상부전극층을 포함하는 OLED 표시장치에 있어서, 상기 하부전극층과 상기 상부전극층 사이의 일부 층면에 형성되어 제너 다이오드 역할을 하는 제너다이오드층을 포함하며, 상기 제너다이오드층은 제너N층과 제너P층이 적층되어 형성되는 것을 특징으로 한다.According to an aspect of the present invention, an OLED display device including a lower electrode layer, a light emitting layer, and an upper electrode layer may include a zener diode layer formed on a portion of a surface between the lower electrode layer and the upper electrode layer to serve as a zener diode. The zener diode layer is formed by stacking a Zener N layer and a Zener P layer.

위와 같이 본 발명은 수동형 메트릭스 OLED 패널 상의 주사선 단위로 제너 전압이 다른 제너 다이오드를 각 픽셀에 추가하여 구성함으로써 데이터 라인에 단계별 전압 인가시 턴 온 되는 주사선 아래로는 전압이 인가되지 않도록 하여 OLED 패널의 소비전력을 감소시킨다.As described above, the present invention is configured by adding a Zener diode having a different zener voltage to each pixel in units of scan lines on a passive matrix OLED panel so that voltage is not applied below the scan lines turned on when voltage is applied to the data lines step by step. Reduce power consumption

이하, 본 발명의 바람직한 실시예를 첨부한 도면을 참고하여 상세히 설명한다.Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

도 3은 본 발명에 의한 제너 다이오드를 이용한 OLED 표시 장치의 각 픽셀의 구성을 보인 도면이다.3 is a diagram illustrating a configuration of each pixel of an OLED display using a zener diode according to the present invention.

도 3 에 도시한 바와 같이, 본 발명은 하부전극층, 발광층, 상부전극층을 포함하는 OLED 표시장치에 있어서, 상기 하부전극층과 상기 상부전극층 사이의 일부 층면에 형성되어 제너 다이오드 역할을 하는 제너다이오드층을 포함하며, 상기 제너다이오드층은 제너N층과 제너P층을 적층시켜 형성한다.
즉, 상기 OLED 표시장치 각각의 픽셀 상의 에노드(Anode) 단 투명전극(ITO:Indium-Tin Oxide) 위에 순차적으로 제너N층과 제너P층과 발광층과 알루미늄(Al)이 적층된 각 픽셀로 OLED 패널을 구성한다.As shown in FIG. 3, in the OLED display device including a lower electrode layer, a light emitting layer, and an upper electrode layer, a zener diode layer is formed on a portion of a layer between the lower electrode layer and the upper electrode layer to serve as a zener diode. The zener diode layer is formed by stacking a Zener N layer and a Zener P layer.
That is, each pixel in which a Zener N layer, a Zener P layer, a light emitting layer, and aluminum (Al) are sequentially stacked on an anode-indium transparent electrode (ITO) on each pixel of the OLED display device Configure the panel.

이러한 구성을 갖는 OLED 표시장치는 제1주사선(또는 Row1열)이 턴 온(Turn on) 될 시 데이터 라인(또는 Column)에 인가된 전압은 제1주사선의 제너 전압을 만족하지만 제2주사선~제N주사선까지의 제너 전압보다는 낮은 전압으로 인가되어 제1주사선을 제외한 타 주사선의 기생 커패시터는 발생하지 않게 된다.In the OLED display having such a configuration, when the first scan line (or Row1 column) is turned on, the voltage applied to the data line (or column) satisfies the zener voltage of the first scan line, but the second scan line to the first scan line. Since a voltage lower than the Zener voltage to the N scan line is applied, parasitic capacitors of other scan lines except for the first scan line do not occur.

또한, 제2주사선(또는 Row2열)이 턴 온 될 시에는 제1주사선 및 제2주사선에만 제너 전압이 발생하여 역전류가 흐르나 접지 연결은 제2주사선만 되는 상태이고, 제1주사선에는 기생 커패시터가 발생한다.In addition, when the second scan line (or Row2 column) is turned on, a zener voltage is generated only on the first scan line and the second scan line so that a reverse current flows, but the ground connection is only a second scan line, and a parasitic capacitor is applied to the first scan line. Occurs.

본 발명에 따르면, 주사선구동회로에 의한 주사동작이 한 주사선으로부터 다음 주사선으로 진행할 때, 스위치들의 모두가 턴 온 된다. 이것은 구동전류를 데이터선들에 인가하기 직전에 데이터선들이 서로 접속되고 데이터선들을 각 픽셀에 구비된 제너 다이오드에 접속된다. 그러므로, 이전 주사단계 동안 발광된 화소들로부터 기생커패시터들에 저장된 전하는 기생커패시터들을 충전하기 위하여, 데이터선들을 통해 화소들 모두의 기생커패시터들 속으로 흐를 수 있다. 따라서, 각 화소의 유기EL소자는 제너 다이오드에 의해 결정된 전압으로 충전된다.According to the present invention, when the scan operation by the scan line driver circuit proceeds from one scan line to the next scan line, all of the switches are turned on. This is just before the driving current is applied to the data lines, the data lines are connected to each other, and the data lines are connected to the zener diode provided in each pixel. Therefore, the charge stored in the parasitic capacitors from the pixels emitted during the previous scanning step may flow into the parasitic capacitors of all the pixels through the data lines to charge the parasitic capacitors. Therefore, the organic EL element of each pixel is charged to the voltage determined by the zener diode.

즉, 데이터 라인에 단계별 전압 인가 시 턴 온 되는 주사선 아래로는 전압이 인가되지 않도록 하여 기생 커패시터를 줄여 소비전력을 절감시키는 것이다.That is, the power consumption is reduced by reducing parasitic capacitors by preventing voltage from being applied below the scan line which is turned on when voltage is applied to the data line step by step.

한편, 본 발명은 10 라인 또는 20 라인 등의 일정 간격 라인 단위로 제너 다 이오드를 삽입하여 구성할 수도 있다.On the other hand, the present invention can be configured by inserting the zener diode in units of a predetermined interval line, such as 10 lines or 20 lines.

위와 같이 본 발명은 수동형 메트릭스 OLED 패널 상의 주사선 단위로 제너 전압이 다른 제너 다이오드를 각 픽셀에 추가하여 구성함으로써 데이터 라인에 단계별 전압 인가시 턴 온 되는 주사선 아래로는 전압이 인가되지 않도록 하여 OLED 패널의 소비전력을 감소시킨다.As described above, the present invention is configured by adding a Zener diode having a different zener voltage to each pixel in units of scan lines on a passive matrix OLED panel so that voltage is not applied below the scan lines turned on when voltage is applied to the data lines step by step. Reduce power consumption

또한, 본 발명은 같은 구동 전류가 흘러도 제너 다이오드에 의한 동작 전압이 높아져 높은 휘도를 얻을 수 있어 라인의 휘도를 보상하고, 제너 다이오드의 정전압 유지 특성으로 안정적인 동작을 기대할 수 있다.In addition, according to the present invention, even when the same driving current flows, the operating voltage by the zener diode is increased to obtain high luminance, thereby compensating for the luminance of the line and expecting stable operation due to the constant voltage holding characteristic of the zener diode.

상술한 바와 같이, 본 발명은 수동형 메트릭스 OLED 패널 상의 주사선 단위로 제너 전압이 다른 제너다이오드를 각 픽셀에 추가하여 구성함으로써 데이터 라인에 단계별 전압 인가시 턴 온 되는 주사선 아래로는 전압이 인가되지 않도록 하여 OLED 패널의 소비전력 감소시키는 이점이 있다.As described above, the present invention is configured by adding a zener diode having a different zener voltage to each pixel in units of scan lines on a passive matrix OLED panel so that no voltage is applied below the scan lines turned on when voltage is applied to the data lines step by step. There is an advantage of reducing the power consumption of the OLED panel.

또한, 본 발명은 같은 구동 전류가 흘러도 제너 다이오드에 의한 동작 전압이 높아져 높은 휘도를 얻을 수 있어 라인의 휘도를 보상하고, 제너 다이오드의 정전압 유지 특성으로 안정적인 동작을 기대할 수 있는 이점이 있다.In addition, the present invention has the advantage that the operating voltage is increased by the zener diode even when the same drive current flows to obtain a high luminance to compensate for the luminance of the line, and stable operation can be expected by the constant voltage holding characteristics of the zener diode.

Claims (1)

하부전극층, 발광층, 상부전극층을 포함하는 OLED 표시장치에 있어서,An OLED display comprising a lower electrode layer, a light emitting layer, and an upper electrode layer, 상기 하부전극층과 상기 상부전극층 사이의 일부 층면에 형성되어 제너 다이오드 역할을 하는 제너다이오드층을 포함하며,A zener diode layer formed on a partial layer surface between the lower electrode layer and the upper electrode layer to serve as a zener diode; 상기 제너다이오드층은 제너N층과 제너P층이 적층되어 형성되는 것을 특징으로 하는 제너 다이오드를 이용한 OLED 표시 장치.The Zener diode layer is formed by stacking a Zener N layer and a Zener P layer.
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