JP2007232796A - Organic el display device - Google Patents

Organic el display device Download PDF

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JP2007232796A
JP2007232796A JP2006051247A JP2006051247A JP2007232796A JP 2007232796 A JP2007232796 A JP 2007232796A JP 2006051247 A JP2006051247 A JP 2006051247A JP 2006051247 A JP2006051247 A JP 2006051247A JP 2007232796 A JP2007232796 A JP 2007232796A
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power supply
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JP5023271B2 (en
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Hisanori Tokuda
尚紀 徳田
Hiroshi Kageyama
景山　　寛
Masamitsu Furuya
政光 古家
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Japan Display Inc
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Hitachi Displays Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To improve picture quality defects such as a luminance inclination and a smear by reducing the wiring resistance of a power supply bus wiring line supplying electric power to an organic EL element. <P>SOLUTION: A plurality of pixels 22 arranged in a matrix are connected to a plurality of power lines 23, which are connected to the power supply bus wiring line 24. Both ends of the power supply bus wiring line 24 are connected to a power source section 25 through an FPC 16. The electric power is supplied from the power source section 25 to both the ends of the power supply bus wiring line 24, and thus the wiring resistance of the power supply bus wiring line is reduced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、画素として有機ＥＬ素子を用いた有機ＥＬ表示装置に関し、特に、有機ＥＬ素子を発光させるための電力を供給する電源配線を改善したものである。   The present invention relates to an organic EL display device using an organic EL element as a pixel, and in particular, improves power supply wiring for supplying electric power for causing the organic EL element to emit light.

有機ＥＬ素子は、電流を流して発光させる電流発光型の素子であり、有機ＥＬ素子が形成されているＴＦＴ基板内の電源配線に、数十から百ｍＡの大電流が流れる。特に、有機ＥＬ表示パネルを定電圧駆動する場合に、表示パネル入口の端子からＴＦＴ基板内の電源配線を経て各画素に電力を供給する際に、電源配線の抵抗に起因して生じる電圧降下により、輝度傾斜やスメア等の画質不艮が発生する。このためＴＦＴ基板内（表示パネル入口から各画素まで）の電源配線の抵抗を低減させることが必要である。   The organic EL element is a current-emitting element that emits light by passing a current, and a large current of several tens to several hundred mA flows through a power supply wiring in the TFT substrate on which the organic EL element is formed. In particular, when the organic EL display panel is driven at a constant voltage, a voltage drop caused by the resistance of the power supply wiring is caused when power is supplied to each pixel from the terminal at the entrance of the display panel via the power supply wiring in the TFT substrate. In addition, image quality defects such as brightness gradient and smear occur. For this reason, it is necessary to reduce the resistance of the power supply wiring in the TFT substrate (from the display panel entrance to each pixel).

電源配線抵抗の低減について、下記特許文献１には、マトリクス状に配置された複数の有機ＥＬ素子を駆動する駆動電源線の抵抗による電圧降下を低減するために、駆動電源線の両端（及び中間）に補助電源線を接続することが記載されている。
特開２００３−１０８０６８号公報 Regarding the reduction of power supply wiring resistance, the following Patent Document 1 describes both ends (and intermediate) of a drive power supply line in order to reduce a voltage drop due to resistance of the drive power supply line that drives a plurality of organic EL elements arranged in a matrix. ) To connect an auxiliary power line.
JP 2003-108068 A

上記特許文献１においては、複数の有機ＥＬ素子に接続する駆動電源線の電圧降下を低減しているが、複数の駆動電源線に接続する補助電源線の電圧降下については考慮されていない。   In Patent Document 1, the voltage drop of the drive power supply line connected to the plurality of organic EL elements is reduced, but the voltage drop of the auxiliary power supply line connected to the plurality of drive power supply lines is not considered.

そこで、本発明は、複数の有機ＥＬ素子に接続される電源線に電力を供給する電源バス配線の電圧降下を低減した有機ＥＬ表示装置を提供することを目的とする。   Therefore, an object of the present invention is to provide an organic EL display device in which a voltage drop of a power supply bus line for supplying power to a power supply line connected to a plurality of organic EL elements is reduced.

本発明は、複数の有機ＥＬ素子に接続する電源線と、この電源線に接続される電源バス配線とからなり、この電源バス配線の両端に電力を供給することを特徴とする。   The present invention includes a power supply line connected to a plurality of organic EL elements and a power supply bus line connected to the power supply line, and supplies power to both ends of the power supply bus line.

以上、本発明によると、有機ＥＬ素子の電源線に電力を供給する電源バス配線の配線抵抗による電圧低下が低減され、電源バス配線による輝度傾斜やスメア等の画質不良を改善した有機ＥＬ表示装置が得られる。   As described above, according to the present invention, the voltage drop due to the wiring resistance of the power supply bus wiring that supplies power to the power supply line of the organic EL element is reduced, and the image quality defects such as luminance gradient and smear due to the power supply bus wiring are improved. Is obtained.

本発明に係る表示装置は、ＴＶ、ＰＣモニタ、ノートＰＣ、ＰＤＡ、携帯電話、テジタルスチルカメラ、デジタルビテオカメラ、カーナビ用モニタ等に適用でき、また、他の自発光型ディスプレイにも適用可能である。   The display device according to the present invention can be applied to a TV, a PC monitor, a notebook PC, a PDA, a mobile phone, a digital still camera, a digital video camera, a car navigation monitor, and the like, and can also be applied to other self-luminous displays. is there.

以下、図面を用いて、本発明の実施例を説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１は、本発明に係る有機ＥＬ表示装置の概観図であって、同図（ａ）は正面図、同図（ｂ）は断面図である。図１において、ＴＦＴ基板（表示パネル）１１には画素部１２が形成され、画素部１２は、ＴＦＴ基板１１とそれに対向する封止基板１３とシール材１４とで封止される。封止された空間には、画素部１２における有機ＥＬ素子が湿気で劣化するのを防止するために、乾燥材１５が封入されている。また、ＴＦＴ基板１１には、有機ＥＬ素子を駆動するための信号と電源部からの電力を供給するためのＦＰＣ(Flexible Printed Circuit)１６が設けられている。   1A and 1B are schematic views of an organic EL display device according to the present invention, in which FIG. 1A is a front view and FIG. 1B is a cross-sectional view. In FIG. 1, a pixel portion 12 is formed on a TFT substrate (display panel) 11, and the pixel portion 12 is sealed with a TFT substrate 11, a sealing substrate 13 facing the TFT substrate 11, and a sealing material 14. In the sealed space, a desiccant 15 is enclosed in order to prevent the organic EL element in the pixel unit 12 from being deteriorated by moisture. The TFT substrate 11 is provided with an FPC (Flexible Printed Circuit) 16 for supplying a signal for driving the organic EL element and electric power from the power supply unit.

図２は、図１に示す有機ＥＬ表示装置の駆動回路図である。図２において、表示領域２１には、有機ＥＬ素子からなる画素２２がマトリクス状に配置されている。これら複数の画素２２は、電源線２３に接続され、複数の電源線２３は、電源バス配線２４に接続される。この電源バス配線２４の両端は、表示パネル１１の両側に設けたＦＰＣ１６を介して、電源部２５に接続されている。このようにして、両側の電源部２５から電源バス配線２４の両端に電力を供給することで、画素２２における有機ＥＬ素子が発光する。   FIG. 2 is a drive circuit diagram of the organic EL display device shown in FIG. In FIG. 2, pixels 22 made of organic EL elements are arranged in a matrix in the display area 21. The plurality of pixels 22 are connected to a power supply line 23, and the plurality of power supply lines 23 are connected to a power supply bus line 24. Both ends of the power supply bus line 24 are connected to the power supply unit 25 via the FPCs 16 provided on both sides of the display panel 11. In this manner, by supplying power from both power supply units 25 to both ends of the power supply bus wiring 24, the organic EL elements in the pixels 22 emit light.

また、マトリクス状に配置された複数の画素２２は、走査線２６とデータ線２７に接続され、走査線駆動回路２８で選択された走査線２６の走査信号と、データ線駆動回路２９に接続されているデータ線２７からのデータ信号とで駆動される。   The plurality of pixels 22 arranged in a matrix are connected to the scanning line 26 and the data line 27, and are connected to the scanning signal of the scanning line 26 selected by the scanning line driving circuit 28 and the data line driving circuit 29. It is driven by the data signal from the data line 27.

表示制御部３０は、外部からの信号を受け取り、走査線駆動回路２８とデータ線駆動回路２９に、ＦＰＣ１６を介して、走査信号とデータ信号を供給すると共に、電源部２５を制御する。この電源部２５と表示制御部３０は、ＦＰＣ１６に設けるように図示されているが、必ずしもＦＰＣ１６に設ける必要はない。   The display control unit 30 receives a signal from the outside, supplies a scanning signal and a data signal to the scanning line driving circuit 28 and the data line driving circuit 29 via the FPC 16, and controls the power supply unit 25. Although the power supply unit 25 and the display control unit 30 are illustrated as being provided in the FPC 16, they are not necessarily provided in the FPC 16.

なお、カソードコンタクト３１は、画素２２における有機ＥＬ素子の陰極に接続され、表示パネル１１において接地されると共に、ＦＰＣ１６を介して、ＦＰＣ１６においても接地される。   The cathode contact 31 is connected to the cathode of the organic EL element in the pixel 22 and is grounded in the display panel 11 and is also grounded in the FPC 16 via the FPC 16.

図３は、図２に示す有機ＥＬ素子からなる画素２２の詳細図である。図３において、表示領域２１内の複数の画素２２には、走査線駆動回路２８で選択され、データ線駆動回路２９からのデータ信号を取り入れるスイッチングＴＦＴ４１と、データ信号を記憶する容量４２と、データ信号に応じて有機ＥＬ素子４３を駆動するドライバＴＦＴ４４が設けられている。電源バス配線２４の両端には電源部２５が接続されている。   FIG. 3 is a detailed view of the pixel 22 composed of the organic EL element shown in FIG. In FIG. 3, a plurality of pixels 22 in the display area 21 are selected by the scanning line driving circuit 28, a switching TFT 41 that takes in a data signal from the data line driving circuit 29, a capacitor 42 that stores the data signal, and data A driver TFT 44 that drives the organic EL element 43 in accordance with a signal is provided. A power supply unit 25 is connected to both ends of the power supply bus wiring 24.

有機ＥＬ素子４３の陽極側は、ドライバＴＦＴ４４に接続され、陰極側は、基準電位（接地電位）を保つ陰極電流線４５に接続され、この陰極電流線４５はカソードコンタクト３１に接続される。   The anode side of the organic EL element 43 is connected to the driver TFT 44, and the cathode side is connected to a cathode current line 45 that maintains a reference potential (ground potential). The cathode current line 45 is connected to the cathode contact 31.

本実施例では、電源バス配線２４の両端から電力を供給するから、片方の端子から供給するものに比べて、電源バス配線２４の配線抵抗による電圧降下を低減することができる。このように、電圧降下を低減することで、水平な電源バス配線２４の水平方向の輝度傾斜を低減することができる。なお、垂直な電源線２３の電圧降下による垂直方向の輝度傾斜は無視している。   In this embodiment, since power is supplied from both ends of the power supply bus wiring 24, voltage drop due to the wiring resistance of the power supply bus wiring 24 can be reduced as compared with the case where power is supplied from one terminal. Thus, by reducing the voltage drop, it is possible to reduce the luminance gradient in the horizontal direction of the horizontal power supply bus wiring 24. Note that the luminance gradient in the vertical direction due to the voltage drop of the vertical power supply line 23 is ignored.

図４は、実施例１の図２に対応する有機ＥＬ表示装置の駆動回路図である。実施例１と異なる点は、上側電源バス配線５１を設けた点である。その他の構成は図２と同様であるので、詳細な説明は省略する。   FIG. 4 is a drive circuit diagram of the organic EL display device corresponding to FIG. 2 of the first embodiment. The difference from the first embodiment is that an upper power supply bus line 51 is provided. Since other configurations are the same as those in FIG. 2, detailed description thereof is omitted.

図４において、複数の電源線２３の一方の端は、下側の電源バス配線２４に、他方の端は、上側電源バス配線５１に接続されている。下側の電源バス配線２４と上側電源バス配線５１には、ＦＰＣ１６側の電源部２５から電力が供給される。   In FIG. 4, one end of the plurality of power supply lines 23 is connected to the lower power supply bus line 24, and the other end is connected to the upper power supply bus line 51. Power is supplied to the lower power supply bus line 24 and the upper power supply bus line 51 from the power supply unit 25 on the FPC 16 side.

このように、電源線２３の両端から電力を供給することにより、電源線２３の電圧降下を低減することができる。   Thus, by supplying power from both ends of the power supply line 23, the voltage drop of the power supply line 23 can be reduced.

本実施例においては、下側の電源バス配線２４と上側電源バス配線５１の電圧降下を低減すると共に、電源線２３の電圧降下をも低減することができるので、実施例１と同様に、水平方向の輝度傾斜を低減し、さらに、電源線２３の配線抵抗による垂直方向の輝度傾斜をも低減できる。   In the present embodiment, the voltage drop of the lower power supply bus line 24 and the upper power supply bus line 51 can be reduced and the voltage drop of the power supply line 23 can also be reduced. The luminance gradient in the direction can be reduced, and the luminance gradient in the vertical direction due to the wiring resistance of the power supply line 23 can also be reduced.

図５は、実施例１の図２に対応する有機ＥＬ表示装置の駆動回路図である。実施例１と異なる点は、図２に示す右側のＦＰＣ１６と電源部２５を省略して、電源バス配線２４をＵ字型とした点である。その他の構成は図２と同様であるので、詳細な説明は省略する。   FIG. 5 is a drive circuit diagram of the organic EL display device corresponding to FIG. 2 of the first embodiment. The difference from the first embodiment is that the right FPC 16 and the power supply unit 25 shown in FIG. 2 are omitted, and the power supply bus wiring 24 is U-shaped. Since other configurations are the same as those in FIG. 2, detailed description thereof is omitted.

図５において、Ｕ字型の電源バス配線２４の両端に、ＦＰＣ１６側の電源部２５から電力が供給される。Ｕ字型の電源バス配線２４の部分ｂの配線幅を太くするなどしてその抵抗を、部分ａの抵抗より低くしてある。したがって、Ｕ字型の電源バス配線２４の部分ａと部分ｂとは、実質的に並列に接続されることになり、電源バス配線２４の実質的な抵抗を部分ｂの抵抗よりさらに低くすることになる。   In FIG. 5, power is supplied from the power supply unit 25 on the FPC 16 side to both ends of the U-shaped power supply bus wiring 24. The resistance is made lower than the resistance of the portion a by increasing the wiring width of the portion b of the U-shaped power supply bus wiring 24. Therefore, the part a and the part b of the U-shaped power supply bus line 24 are connected substantially in parallel, and the substantial resistance of the power supply bus line 24 is made lower than the resistance of the part b. become.

本実施例においては、電源バス配線２４の電圧降下を簡単な構成で低減することができるので、実施例と同様に、水平方向の輝度傾斜を低減することができる。   In the present embodiment, the voltage drop of the power supply bus wiring 24 can be reduced with a simple configuration, so that the luminance gradient in the horizontal direction can be reduced as in the embodiment.

図６は、実施例３の図５に対応する有機ＥＬ表示装置の駆動回路図である。実施例３と異なる点は、上側電源バス配線５１をＵ字型とした点である。その他の構成は図５と同様であるので、詳細な説明は省略する。   FIG. 6 is a drive circuit diagram of an organic EL display device corresponding to FIG. 5 of the third embodiment. The difference from the third embodiment is that the upper power supply bus wiring 51 is U-shaped. Since other configurations are the same as those in FIG. 5, detailed description thereof is omitted.

図６において、Ｕ字型の電源バス配線５１の両端に、ＦＰＣ１６側の電源部２５から電力が供給される。Ｕ字型の電源バス配線５１の部分ｂの配線幅を太くするなどしてその抵抗を、部分ａの抵抗より低くしてある。したがって、Ｕ字型の電源バス配線５１の部分ａと部分ｂとは、実質的に並列に接続されることになり、電源バス配線２４の実質的な抵抗を部分ｂの抵抗よりさらに低くすることになる。   In FIG. 6, power is supplied from the power supply unit 25 on the FPC 16 side to both ends of the U-shaped power supply bus wiring 51. The resistance is made lower than the resistance of the part a by increasing the wiring width of the part b of the U-shaped power supply bus wiring 51. Therefore, the part a and the part b of the U-shaped power supply bus line 51 are connected substantially in parallel, and the substantial resistance of the power supply bus line 24 is made lower than the resistance of the part b. become.

本実施例においては、電源バス配線２４の電圧降下をさらに低減すると共に、電源線２３の電圧降下をも低減することができるので、実施例３と同様に、水平方向の輝度傾斜を低減すると共に、電源線２３の配線抵抗による垂直方向の輝度傾斜をも低減できる。   In the present embodiment, the voltage drop of the power supply bus line 24 can be further reduced, and the voltage drop of the power supply line 23 can also be reduced, so that the luminance gradient in the horizontal direction is reduced as in the third embodiment. In addition, the luminance gradient in the vertical direction due to the wiring resistance of the power supply line 23 can also be reduced.

本発明に係る有機ＥＬ表示装置の概観図。1 is a schematic view of an organic EL display device according to the present invention. 図１に示す実施例１の有機ＥＬ表示装置の駆動回路図。FIG. 2 is a drive circuit diagram of the organic EL display device of Example 1 shown in FIG. 1. 図２に示す有機ＥＬ素子からなる画素の詳細図。FIG. 3 is a detailed view of a pixel composed of the organic EL element shown in FIG. 2. 実施例２の有機ＥＬ表示装置の駆動回路図。FIG. 6 is a drive circuit diagram of an organic EL display device according to Example 2. 実施例３の有機ＥＬ表示装置の駆動回路図。FIG. 6 is a drive circuit diagram of an organic EL display device according to Example 3. 実施例４の有機ＥＬ表示装置の駆動回路図。FIG. 6 is a drive circuit diagram of an organic EL display device according to Example 4.

符号の説明Explanation of symbols

１１…ＴＦＴ基板（表示パネル）、１２…画素部、１３…封止基板、１４…シール材、１５…乾燥材、１６…ＦＰＣ、２１…表示領域、２２…画素、２３…電源線、２４…電源バス配線、２５…電源部、２６…走査線、２７…データ線、２８…走査線駆動回路、２９…データ線駆動回路、３０…表示制御部、３１…カソードコンタクト、４１…スイッチングＴＦＴ、４２…容量、４３…有機ＥＬ素子、４４…ドライバＴＦＴ、４５…陰極電流線、５１…上側電源バス配線。
DESCRIPTION OF SYMBOLS 11 ... TFT substrate (display panel), 12 ... Pixel part, 13 ... Sealing substrate, 14 ... Sealing material, 15 ... Drying material, 16 ... FPC, 21 ... Display area, 22 ... Pixel, 23 ... Power supply line, 24 ... Power supply bus wiring 25 ... Power supply unit 26 ... Scanning line 27 ... Data line 28 ... Scanning line drive circuit 29 ... Data line drive circuit 30 ... Display control unit 31 ... Cathode contact 41 ... Switching TFT 42 ... Capacitor 43 ... Organic EL element 44 ... Driver TFT 45 ... Cathode current line 51 ... Upper power supply bus line

Claims (4)

複数の画素に電力を供給する複数の電源線と、前記複数の電源線に接続された電源バス配線と、前記電源バス配線に電力を供給する電源部とを備えた有機ＥＬ表示装置において、
前記電源バス配線の両端に、ＦＰＣを介して、電源部からの電力を供給することを特徴とする有機ＥＬ表示装置。 In an organic EL display device comprising a plurality of power supply lines for supplying power to a plurality of pixels, a power supply bus line connected to the plurality of power supply lines, and a power supply unit for supplying power to the power supply bus line,
An organic EL display device, wherein power from a power supply unit is supplied to both ends of the power supply bus wiring through an FPC. 前記電源バス配線を、電源線の両端に設け、電源バス配線の両端に、ＦＰＣを介して、電源部からの電力を供給することを特徴とする請求項１に記載の有機ＥＬ表示装置。   2. The organic EL display device according to claim 1, wherein the power supply bus wiring is provided at both ends of the power supply line, and power from the power supply unit is supplied to both ends of the power supply bus wiring through the FPC. 前記電源バス配線を、Ｕ字型とし、Ｕ字型の電源バス配線の両端に、電源部からの電力を供給することを特徴とする請求項１に記載の有機ＥＬ表示装置。   2. The organic EL display device according to claim 1, wherein the power bus wiring is U-shaped, and power from a power supply unit is supplied to both ends of the U-shaped power bus wiring. 前記電源バス配線を、Ｕ字型として、電源線の両端に設け、Ｕ字型の電源バス配線の両端に、電源部からの電力を供給することを特徴とする請求項１に記載の有機ＥＬ表示装置。
2. The organic EL according to claim 1, wherein the power bus wiring is U-shaped and provided at both ends of a power supply line, and power from a power supply unit is supplied to both ends of the U-shaped power bus wiring. Display device.
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