JPH11327506A - Driving circuit for el display device - Google Patents

Driving circuit for el display device

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Publication number
JPH11327506A
JPH11327506A JP13042898A JP13042898A JPH11327506A JP H11327506 A JPH11327506 A JP H11327506A JP 13042898 A JP13042898 A JP 13042898A JP 13042898 A JP13042898 A JP 13042898A JP H11327506 A JPH11327506 A JP H11327506A
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data
device
part
pixels
display
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JP13042898A
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Japanese (ja)
Inventor
Tatsuo Fukuda
Yoshihisa Tsuruoka
辰男 福田
誠久 鶴岡
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Futaba Corp
双葉電子工業株式会社
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/22Control 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
    • G09G3/30Control 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
    • G09G3/32Control 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]
    • G09G3/3208Control 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]
    • G09G3/3216Control 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
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0233Improving the luminance or brightness uniformity across the screen
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0285Improving the quality of display appearance using tables for spatial correction of display data
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/2007Display of intermediate tones
    • G09G3/2011Display of intermediate tones by amplitude modulation
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/2007Display of intermediate tones
    • G09G3/2014Display of intermediate tones by modulation of the duration of a single pulse during which the logic level remains constant

Abstract

PROBLEM TO BE SOLVED: To keep the display quality of an EL display device by making luminance of respective pixels uniform even when pixels having different areas are included as a light emitting part in the device.
SOLUTION: In an EL display device 8, organic layers are laminated between transparent electrodes and metallic electrodes to form pixels as a light emitting part and pixels having different areas are included in the device. Correction data in accordance with respective areas of the pixels of the device 8 are stored in a luminance correction data storage part 14B. A scan output circuit 15 successively scans the metallic electrodes and an arithmetic control circuit 16 reads out correction data of the respective pixels made to correspond to display data stored in a display data storage part 14A from the luminance correction data storage part 14B. In a data outputting part 17, an input voltage is varied for every transparent electrode in synchronization with the scan output circuit 15 by the read out correction data. Then, current values between the electrodes are varied for every pixel by making the energizing time of the current flowing between the electrodes constant.
COPYRIGHT: (C)1999,JPO

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【発明の属する技術分野】本発明は、少なくとも一方が透明な導電材料からなる一対の電極間に、正孔輸送層や発光層等の有機化合物からなる有機層が所定の表示パターン形状に積層形成されたエレクトロルミネッセンス表示装置(以下、EL表示装置という)の駆動回路に関する。 BACKGROUND OF THE INVENTION The present invention, at least one of the pair of electrodes made of a transparent conductive material, laminated organic layer made of an organic compound such as a hole transport layer and a light emitting layer on a predetermined display pattern formation been electroluminescence display device (hereinafter, referred to as EL display device) to a drive circuit.

【0002】 [0002]

【従来の技術】有機エレクトロルミネッセンス素子(以下、有機EL素子という)は、蛍光性有機化合物を含む薄膜を陰極電極と陽極電極の間に挟んだ構造を有し、前記薄膜に電子及び正孔を注入して再結合させることにより励起子(エキシントン)を生成させ、この励起子が失活する際の光の放出(蛍光・燐光)を利用した素子である。 BACKGROUND ART Organic electroluminescent device (hereinafter, referred to as organic EL element) has a sandwich structure in which a thin film containing a fluorescent organic compound between the cathode electrode and the anode electrode, the electrons and holes into the thin film to generate excitons (Ekishinton) by injecting to be recombined is a device which utilizes emission (fluorescence or phosphorescence) of light when the excitons are deactivated.

【0003】図4は有機EL素子を用いたEL表示装置の概略構成を示す側断面図である。 [0003] FIG. 4 is a side sectional view showing a schematic configuration of an EL display device using an organic EL element. 図4に示すEL表示装置は、絶縁性及び透光性を有するガラス基板31上にITO(Indium Tin Oxide)からなる透明電極32が形成されている。 EL display device shown in FIG. 4, a transparent electrode 32 made of ITO (Indium Tin Oxide) on a glass substrate 31 having an insulating property and translucency are formed. 透明電極32上には、有機蛍光体薄膜による有機層33が積層されている。 On the transparent electrode 32, the organic layer 33 by the organic phosphor thin film are stacked. 有機層33は、正孔輸送層33A、発光層33Bの順に透明電極32上に形成された2層構造であり、発光部をなす画素34を形成している。 The organic layer 33, the hole transport layer 33A, a two-layer structure formed on the transparent electrode 32 in the order of the light-emitting layer 33B, and forms a pixel 34 forming the light-emitting portion. 発光層33B上には、Al、Ag、Mg:A On the light emitting layer 33B, Al, Ag, Mg: A
g、Al:Li等の金属電極35が積層されている。 g, Al: Metal electrode 35 Li or the like is laminated.

【0004】上記EL表示装置では、透明電極32を陽極電極として両電極32,35間に電圧を印加して定電流を流す。 [0004] In the EL display device, a transparent electrode 32 by applying a voltage between the electrodes 32 and 35 as an anode electrode conducts a constant current. これにより、有機層33に対して各電極3 Thus, each electrode 3 relative to the organic layer 33
2,35から電子と正孔が注入される。 Electrons and holes are injected from 2,35. そして、注入された電子と正孔が再結合して励起子を生成し、この励起子が失活する際の光の放出により所望の表示がなされる。 The injected electrons and holes are recombined to generate excitons, desired display is performed by the emission of light when the excitons are deactivated. その際の発光は、透明電極32を介してガラス基板31側から観測される。 Emission at that time, is observed from the glass substrate 31 side through the transparent electrode 32.

【0005】 [0005]

【発明が解決しようとする課題】ところで、上記EL表示装置では、均一な輝度を得るとともに、素子の経時変化を補償するため、各画素の電流を一定にして駆動している。 [SUMMARY OF THE INVENTION Incidentally, in the above EL display device, along with obtaining a uniform brightness to compensate for aging of the element, is driven by the current of each pixel constant. しかしながら、面積の異なる画素を組み合わせて表示を行う構成では、定電流駆動すると、発光面積に反比例した輝度となり、均一な輝度を得ることができず、 However, in the configuration for performing display by combining pixels with different areas, when the constant current drive becomes a luminance inversely proportional to the light emitting area, it can not be obtained a uniform brightness,
表示品位を損なうという問題があった。 There is a problem that impair the display quality. また、画素が異なる発光色、又は画素が異なる発光効率を含む場合にも、上記と同様の問題を生じていた。 Also, emission color pixels are different, or even if the pixel includes a different luminous efficiency, have produced the same problem.

【0006】そこで、本発明は、上記問題点に鑑みてなされたものであり、画素の面積、発光色、発光効率が異なっても、各画素の輝度を均一にでき、表示品位を保つことができるEL表示装置の駆動回路を提供することを目的としている。 [0006] The present invention has been made in view of the above problems, the area of ​​the pixel, the emission color, even the luminous efficiency is different, can be a luminance of each pixel uniform, to keep the display quality and its object is to provide a driving circuit of an EL display device capable.

【0007】 [0007]

【課題を解決するための手段】上記目的を達成するため、請求項1の発明は、発光部として面積の異なる画素6A,6Bが形成されるように、少なくとも一方の電極が透光性部材からなる2つの電極2,7間に有機層5が積層形成され、一方の電極2を陽極として電圧を印加し、前記2つの電極2,7間に一定の電流を流して所望の表示を行うEL表示装置の駆動回路11において、前記画素6A,6Bそれぞれの面積に応じた補正データが格納された輝度補正データ記憶部14Bを備え、表示データに対応した各画素6A,6Bの補正データを前記輝度補正データ記憶部14Bから読み出し、この読み出した補正データに基づき、前記電極2,7間に流れる電流の通電時間を一定として前記電極2,7間の電流値を前記画素6毎に可変制御 To achieve the above object, according to an aspect of, the invention of claim 1, different pixel 6A in area as the light-emitting portion, so 6B is formed, at least one electrode of a light-transmitting member the organic layer 5 between the two electrodes 2 and 7 are laminated made, one of the electrodes 2 a voltage is applied as an anode, performing a desired display by applying a constant current between the two electrodes 2 and 7 EL in the driving circuit 11 of the display device, the pixel 6A, 6B comprises a luminance correction data storage unit 14B which correction data is stored according to the respective areas, each pixel 6A corresponding to the display data, 6B and the brightness correction data read from the correction data storage unit 14B, based on the correction data thus read out, variably controlling the current value between the electrodes 2 and 7 in each pixel 6 energization time of the current flowing between the electrodes 2 and 7 as a constant ることを特徴とする。 And wherein the Rukoto.

【0008】請求項2の発明は、発光部として面積の異なる画素6A,6Bが形成されるように、少なくとも一方の電極が透光性部材からなる2つの電極2,7間に有機層5が積層形成され、一方の電極2を陽極として電圧を印加し、前記2つの電極2,7間に一定の電流を流して所望の表示を行うEL表示装置の駆動回路11において、前記画素6A,6Bそれぞれの面積に応じた補正データが格納された輝度補正データ記憶部14Bを備え、 [0008] The second aspect of the present invention, the area of ​​different pixel 6A as a light emitting portion, so 6B is formed, at least one electrode an organic layer 5 between the two electrodes 2,7 consisting of light-transmitting member are laminated, one electrode 2 a voltage is applied as the anode, the driving circuit 11 of the EL display device for performing a desired display by applying a constant current between the two electrodes 2 and 7, the pixel 6A, 6B includes a luminance correction data storage unit 14B which correction data is stored according to the respective areas,
表示データに対応した各画素6A,6Bの補正データを前記輝度補正データ記憶部14Bから読み出し、この読み出した補正データに基づき、前記画素6A,6Bのそれぞれに流れる電流値を一定として前記電極2,7間に流れる電流の通電時間を前記画素6A,6B毎に可変制御することを特徴とする。 Reading each pixel 6A corresponding to the display data, correction data 6B from the luminance correction data storage unit 14B, based on the correction data thus read out, the electrode 2 of the pixel 6A, the current flowing through the respective 6B is constant, the pixel 6A energization time of the current flowing between 7, characterized in that variably controlled for each 6B.

【0009】請求項1又は2のEL表示装置の駆動回路11において、前記補正データは、画素6A,6Bの面積に応じたデータの他、画素6A,6Bの発光色に応じたデータ、画素6A,6Bの発光効率に応じたデータ、 [0009] In the driving circuit 11 of the EL display device according to claim 1 or 2, wherein the correction data, other data according to the area of ​​the pixel 6A, 6B, pixel 6A, 6B data corresponding to the emission color of the pixel 6A , data corresponding to the 6B luminous efficiency,
又はこれらの組合せによるデータとしてもよい。 Or as data by these combinations.

【0010】 [0010]

【発明の実施の形態】図1は本発明による駆動回路が採用されるEL表示装置の一構成例を示す平面図、図2は図1の部分拡大側断面図、図3は本発明によるEL表示装置の駆動回路の実施の形態を示すブロック図である。 DESCRIPTION OF THE PREFERRED EMBODIMENTS Figure 1 is a plan view showing a configuration example of an EL display device driving circuit according to the present invention is employed, Figure 2 is a partially enlarged side sectional view of FIG. 1, EL according to FIG. 3 according to the present invention is a block diagram showing an embodiment of a driving circuit of a display device.

【0011】図1に示すEL表示装置は、矩形状の素子基板1を基部としている。 [0011] EL display device shown in FIG. 1, a rectangular element substrate 1 has a base. 素子基板1は、絶縁性及び透光性を有するガラス基板で構成される。 The element substrate 1 is constituted by a glass substrate having an insulating property and transparency. 素子基板1の表面には、ITO等の透光性部材からなる透明電極2がエッチング法、マクス蒸着法等により略均一な厚さで形成されている。 On the surface of the element substrate 1, the transparent electrode 2 is etching made of a translucent member such as ITO, and is formed with a substantially uniform thickness by Makusu deposition method. 図1における透明電極2は、上列3つの透明電極2Aと、下列3つの透明電極2Bにより2行3列のマトリクス状に形成されている。 The transparent electrode 2 in FIG. 1, the top row of three transparent electrodes 2A, are formed in a matrix of two rows and three columns by the bottom row of three transparent electrodes 2B. 各透明電極2A,2 Each transparent electrode 2A, 2
Bは、その一部が配線をなして素子基板1の外側まで引き出されて後述する駆動回路11のデータ出力回路17 B is the data output circuit 17 of the drive circuit 11, part of which later pulled out to the outside of the element substrate 1 forms a wire
に接続されている。 It is connected to the.

【0012】図1及び図2に示すように、透明電極2上には、例えばエポキシ樹脂、フリットガラスや有機シリカ化合物の焼成等からなる高抵抗の絶縁層3が方形状に積層形成されている。 [0012] As shown in FIGS. 1 and 2, on the transparent electrode 2, an epoxy resin, for example, high-resistance insulating layer 3 made of baking or the like of the frit glass and an organic silica compound are stacked in a square shape . 絶縁層3は、各透明電極2A,2 Insulating layer 3, the transparent electrodes 2A, 2
Bの形状にくり抜かれた貫通部4を有してパターン化されている。 It is patterned with a through portion 4 which is hollowed out in the shape of B.

【0013】絶縁層3は、印刷法、マスク蒸着法、エッチング法等により略均一な厚さで形成される。 [0013] insulating layer 3, a printing method, mask deposition method, is formed in a substantially uniform thickness by etching or the like. 具体的には、SiNやSiO 2をエッチング法により所望のパターン形状に抜く他、フリットガラスや有機シリカ化合物を所望のパターン形状に印刷して焼成したり、耐熱性感光樹脂をフォトリソグラフィの手法により所定のパターン形状にパターンニングすることで絶縁層3が形成される。 Specifically, in addition to removing the SiN or SiO 2 in a desired pattern by etching, the frit glass or organic silica compound or calcined by printing a desired pattern shape, the heat-resistant photosensitive resin by photolithography technique insulating layer 3 is formed by patterning into a predetermined pattern shape.

【0014】図2に示すように、透明電極2上には、絶縁層3の貫通部4を埋めるようにして有機層5が積層形成されている。 [0014] As shown in FIG. 2, on the transparent electrode 2, the organic layer 5 are stacked so as to fill the through portion 4 of the insulating layer 3. 図2に示す有機層5は、例えばDiamine The organic layer 5 shown in FIG. 2, for example Diamine
等の有機化合物からなる正孔輸送層5Aと、有機化合物からなる発光層5Bとの2層で構成され、正孔輸送層5 A hole transport layer 5A made of organic compounds such as composed of two layers of a light-emitting layer 5B made of an organic compound, a hole transport layer 5
A、発光層5Bの順に積層される。 A, are stacked in this order of the light-emitting layer 5B.

【0015】絶縁層3の貫通部4を穴埋めした有機層5 The organic layer 5 filling the through portion 4 of the insulating layer 3
の部分が発光部をなす画素6を形成している。 Portion forms a pixel 6 forming the light-emitting portion. 図1の例において、上列3つの画素6Aは、一辺の長さaの正方形状に形成されている。 In the example of FIG. 1, top row three pixels 6A is formed in a square shape of length a of one side. 下列3つの画素6Bは、上列の画素6Aの面積の2倍の面積の長方形状に形成されている。 Bottom row three pixels 6B is formed in a rectangular 2 times the area of ​​the area of ​​a pixel 6A of the upper row. そして、有機層5が発光することにより、素子基板1側から画素6の形状による表示を観測することができる。 By organic layer 5 emits light, it is possible to observe the display due to the shape of the pixel 6 from the element substrate 1 side.

【0016】なお、発光層5Bの発光材料としては、発光層5Bそのものを発光させる場合には、例えばアルミキノリン(Alq)やジスチルアリーレン系化合物等が使用される。 [0016] Note that the light-emitting material of the light-emitting layer 5B, in the case where the the light emitting layer 5B itself, for example, aluminum quinoline (Alq) and di still arylene-based compounds are used. 発光層5Bに別の発光材料(ドーパント) Another light-emitting material in the light emitting layer 5B (dopant)
を微量ドーピングすることで発光させる場合には、ドーパントとしてキナクリドン(Qd)やレーザ用の色素等が使用される。 The When light emission by trace doping, dyes quinacridone (Qd) and a laser is used as a dopant.

【0017】図1に示すように、発光層5B上には、各列毎の画素6A,6Bを覆うようにして金属電極7(7 As shown in FIG. 1, the light emitting layer On 5B, pixel 6A of each column, a metal electrode 7 so as to cover the 6B (7
A,7B)が積層形成されている。 A, 7B) are stacked. 金属電極7は、A Metal electrodes 7, A
l、Ag、Mg:Ag、Al:Li等からなり、エッチング法、マスク蒸着法等により略均一な厚さで形成される。 l, Ag, Mg: Ag, Al: consists Li or the like, an etching method, to form a substantially uniform thickness by a mask deposition method. 各金属電極7A,7Bは後述する駆動回路11のスキャン出力回路16に接続されている。 Each metal electrode 7A, 7B is connected to the scan output circuit 16 of the drive circuit 11 to be described later.

【0018】素子基板1の外周部分には、水を極力取り除いた不活性ガス(例えばドライ窒素)やドライエアによる雰囲気において、封着部材としての封着用基板9が接着剤により固着される。 [0018] On the outer peripheral portion of the element substrate 1, in an atmosphere with an inert gas (e.g. dry nitrogen) or dry air was removed as much as possible the water, sealing the substrate 9 serving as a sealing member is fixed by an adhesive. これにより、両電極2,7及び有機層5を保護するとともに、高精細な有機EL表示デバイスを実現している。 Thus, to protect the both electrodes 2, 7 and the organic layer 5, thereby realizing a high-definition organic EL display device.

【0019】上記EL表示装置の他の構成として、透明電極2と金属電極7を逆転させた構成としてもよい。 [0019] As another configuration of the EL display device, it may be configured to reverse the transparent electrode 2 and the metal electrode 7. その場合、素子基板1が必ずしも透光性を有する必要はないため、絶縁性を有するガラス基板で構成することができる。 In that case, since the element substrate 1 is not necessarily have a light-transmitting property can be composed of a glass substrate having an insulating property. また、電極2,7としては、少なくとも一方の電極が透光性部材で形成されていればよい。 As the electrodes 2 and 7, at least one electrode may be formed of a translucent member.

【0020】上記構成によるEL表示装置は、一方の電極(例えば透明電極)を陽極として電圧を印加し、各透明電極2と金属電極7間に一定の電流を流すことにより所望の表示が行われる。 The EL display device according to the above structure, one electrode (e.g., transparent electrode) voltage is applied as the anode, the desired display is performed by passing a constant current between the transparent electrode 2 and the metal electrodes 7 .

【0021】上記EL表示装置を一定電流で駆動する駆動回路11は、タイミング信号発生回路12、データ制御部13、表示データ記憶部14Aと輝度補正データ記憶部14Bからなる記憶部14、スキャン出力回路1 The driving circuit 11 for driving the EL display device in a constant current, the timing signal generating circuit 12, the data control unit 13, the display data storage unit 14A and a storage unit 14 composed of a luminance correction data storage unit 14B, the scan output circuit 1
5、演算制御回路16、データ出力回路17を備えて構成される。 5, the arithmetic control circuit 16, and a data output circuit 17.

【0022】タイミング信号発生回路12は、金属電極7を列単位で順次選択走査し、これに同期して各透明電極2にデータ信号を入力して所望の表示が行われるべく、データ制御部13、記憶部14、スキャン出力回路15、演算制御回路16のそれぞれに対して所定のタイミング信号を出力している。 The timing signal generating circuit 12, a metal electrode 7 are sequentially selected scanning by columns, to desired display this by entering the data signal in synchronization with the transparent electrodes 2 is performed, the data control unit 13 , storage unit 14, the scan output circuit 15, and outputs a predetermined timing signal to each of the arithmetic and control circuit 16.

【0023】データ制御部13は、外部から順次入力される表示データ(図1の構成では、例えば英文字「T」、「I」、「L」等を表示するためのデータ)をタイミング発生回路12からのタイミング信号により時系列的に取り込んで表示データ記憶部14Aに記憶している。 The data control unit 13 (in the configuration of FIG. 1, for example, letters "T", "I", "L" data for displaying the like) are sequentially input as the display data from the external timing generating circuit stored in the display data storage unit 14A fetches in chronological by a timing signal from 12.

【0024】輝度補正データ記憶部14Bには、各画素6の面積に応じた輝度補正データがテーブル形式に格納されている。 [0024] luminance correction data storage unit 14B, the luminance correction data corresponding to the area of ​​each pixel 6 is stored in a table format. 更に説明すると、所定面積の画素に印加されるべき電圧レベルを予め基準データとして定め、この基準データを元に各画素6の面積に応じた電圧レベルによる補正データがテーブル形式に格納されている。 With further described, determined in advance as reference data voltage level to be applied to the pixels in a predetermined area, the correction data by the voltage level corresponding to the area of ​​each pixel 6 of the reference data based on is stored in a table format.

【0025】又は、所定面積の画素に印加されるべき電圧のパルス幅を予め基準データとして定め、この基準データを元に各画素6の面積に応じた電圧レベルによる補正データがテーブル形式に格納されている。 [0025] or, set in advance as reference data the pulse width of the voltage to be applied to the pixels in a predetermined area, the correction data by the voltage level corresponding to the area of ​​each pixel 6 of the reference data based on the stored in the table format ing.

【0026】スキャン出力回路15は、タイミング発生回路12からのタイミング信号によりEL表示装置の金属電極7A,7Bを列単位で順次選択走査している。 The scan output circuit 15, a metal electrode 7A of the EL display device by the timing signal from the timing generating circuit 12 are sequentially selected scanning 7B column by column. 図1の例では、上列3つの金属電極7A、下列3つの金属電極7Bの順に選択走査される。 In the example of FIG. 1, top row three metal electrodes 7A, are selected sequentially scanned under column three metal electrodes 7B.

【0027】演算制御回路16は、タイミング発生回路12からのタイミング信号により表示データ記憶部14 The arithmetic control circuit 16 displays the timing signal from the timing generator 12 data storage unit 14
Aから読み出した表示データに対応する各画素6毎の補正データを輝度補正データ記憶部14Bから読み出してデータ出力回路17に出力している。 The correction data of each pixel every 6 corresponding to the display data read from the A reading from the luminance correction data storage unit 14B and outputs the data output circuit 17.

【0028】ここで、輝度補正データ記憶部14Bに電圧レベルによる補正データが格納された構成を採用した場合には、読み出した補正データによりデータ出力回路17のドライバ回路の入力電圧のレベルが可変され、各画素6の面積に応じて各透明電極2と金属電極7との間に流れる出力電流が可変される。 [0028] Here, in the case where the configuration in which correction data according to the voltage level to the luminance correction data storage unit 14B is stored is the level of the input voltage of the read correction data by the driver circuit of the data output circuit 17 is variable , the output current flowing between the respective transparent electrodes 2 and metal electrode 7 according to the area of ​​each pixel 6 is varied. その際の通電時間は一定であり、例えば画素6Aを発光させるときに入力される補正データの電圧レベルを基準データとし、そのときの出力電流を5mA/cm 2とすると、画素6Aの2倍の面積の画素6Bを発光させるときには、データ出力回路17に基準データの2倍のレベルの電圧が入力され、 Energizing time at this time is constant, for example, the voltage level of the correction data inputted when the light emission pixels 6A as a reference data, when the output current at that time and 5 mA / cm 2, twice the pixel 6A when light emission pixel 6B of the area, a voltage twice the level of the reference data to the data output circuit 17 are inputted,
その出力電流は10mA/cm 2となる。 The output current is 10 mA / cm 2.

【0029】これに対し、輝度補正データ記憶部14B [0029] In contrast, luminance correction data storage unit 14B
にパルス幅による補正データが格納された構成を採用した場合には、読み出した補正データによりデータ出力回路17のドライバ回路の入力電圧のパルス幅が可変され、各画素6の面積に応じて各透明電極2と金属電極7 When the correction data by the pulse width is adopted configurations stored in the pulse width of the input voltage of the driver circuit of the data output circuit 17 by the correction data read out is variably, the transparent depending on the area of ​​each pixel 6 electrode 2 and the metal electrodes 7
との間に流れる出力電流の通電時間が可変される。 Energization time of the output current flowing between the is varied. 例えば画素6Aを発光させるときに入力される補正データのパルス幅を基準データとし、そのときの出力電流を5m For example the pulse width of the correction data inputted when the light emission pixels 6A as a reference data, the output current at that time 5m
A/cm 2とすると、画素6Aの2倍の面積の画素6B When A / cm 2, the pixel 6B of 2 times the area of the pixel 6A
を発光させるときには、データ出力回路17に基準データの2倍のパルス幅の電圧が入力され、その出力電流は10mA/cm 2となる。 When emit, the voltage of twice the pulse width of the reference data to the data output circuit 17 is input, the output current is 10 mA / cm 2.

【0030】データ出力回路17は、スキャン出力回路15に同期して各画素6をオン・オフするデータ信号を出力している。 The data output circuit 17 outputs the data signal for turning on and off each pixel 6 in synchronism with the scan output circuit 15. 更に説明すると、データ出力回路17 In more detail, the data output circuit 17
は、定電流駆動のトランジスタを透明電極2の数だけ備えたドライバ回路で構成される。 It is composed of a driver circuit having a transistor of the constant current drive by the number of transparent electrodes 2. そして、データ出力回路17は、上述したように、演算制御回路16からの補正データに応じた出力電流が得られるように入力電圧が制御され、面積に応じた一定電流が各透明電極2と金属電極7との間に流れる。 Then, the data output circuit 17, as described above, the input voltage such that the output current corresponding to the correction data from the arithmetic control circuit 16 is obtained is controlled, constant current the transparent electrode 2 and the metal corresponding to the area It flows between the electrode 7.

【0031】このように、本実施の形態のEL表示装置によれば、異なる面積の画素6により発光部が形成されていても、各画素6の電流密度の平均値を同等にして各画素6の輝度を均一にでき、表示品位を保つことができる。 [0031] Thus, according to the EL display device of this embodiment, different even light emitting unit by the pixel 6 in area are formed, each pixel the average value of the current density of each pixel 6 in the same 6 can the brightness uniform, it is possible to maintain the display quality.

【0032】ところで、上述した実施の形態では、有機層5が正孔輸送層5Aと発光層5Bの2層構造からなるものを一例として説明したが、この有機層5は、発光層と電荷輸送層(正孔輸送層、正孔注入・輸送層、電子注入層、電子注入・輸送層等)との組合せで構成してもよい。 [0032] In the embodiment described above, although the organic layer 5 has been described as an example that a two-layer structure of a hole transport layer 5A and the light-emitting layer 5B, the organic layer 5, a charge transport and light-emitting layer layer (a hole transport layer, hole injecting and transporting layer, an electron injection layer, an electron injecting and transporting layer, etc.) may be constituted in combination with. 具体的には、発光層1層のみ、発光層と正孔輸送層の2層、発光層と電子注入層の2層、正孔輸送層と発光層と電子注入層の3層等で構成される。 Specifically, only the light-emitting layer one layer, two layers of light-emitting layer and the hole transporting layer, two layers of light-emitting layer and the electron injection layer is composed of three layers such as the hole transport layer light emitting layer and the electron injection layer that.

【0033】なお、電子注入層としては、電子の注入をし易くするため、例えばLi、Na、Mg、Ca等の仕事関数の小さい金属材料単体、或いは例えばAl:L [0033] As the electron injection layer, in order to facilitate the injection of electrons, for example Li, Na, Mg, less metal material alone work function such as Ca, or for example Al: L
i、Mg:In、Mg:Ag等の仕事関数の小さい合金が使用される。 i, Mg: In, Mg: has a small alloy work function such as Ag used.

【0034】EL表示装置における画素6のパターンは図示のものに限定されるものではなく、その形状、面積、個数は表示形態に応じて任意に形成されるものである。 The pattern of the pixel 6 in the EL display device is not limited to the illustrated shape, area, number of which are optionally formed depending on the display mode.

【0035】上記実施の形態では、EL表示装置として、面積の異なる2種類の画素6A,6Bを備えた例について説明したが、異なる発光色の画素、異なる発光効率の画素を含むEL表示装置の場合でも、上記と同様の効果を奏する。 [0035] In the above embodiment, as an EL display device, two different types of pixels 6A in area, an example has been described with a 6B, different emission colors pixels, the EL display including pixels of different emission efficiency even if, the same effects as described above. その場合、輝度補正データ記憶部14B In that case, the luminance correction data storage unit 14B
には、各画素6の発光色又は発光効率毎の輝度補正データが画素6毎にテーブル形式に格納される。 The luminance correction data for emission colors or luminous efficiency for each of the pixels 6 are stored in a table format for each pixel 6.

【0036】更に説明すると、輝度補正データ記憶部1 [0036] To further illustrate, the luminance correction data storage unit 1
4Bには、画素6の発光色又は発光効率毎に印加されるべきレベル又はパルス幅の電圧が補正データとして格納される。 The 4B, the voltage of the emission color or level or pulse width to be applied for each emission efficiency of the pixel 6 is stored as correction data. そして、前述した面積の異なる画素6A,6B The different pixels 6A in area described above, 6B
を発光させる場合と同様、各画素6の必要とする輝度に対応する電流密度となるように、表示データに対応する補正データによりデータ出力回路17の出力が制御される。 As if to emit light, so that the current density corresponding to the luminance in need of each pixel 6, the output of the data output circuit 17 is controlled by the correction data corresponding to the display data. これにより、各透明電極2と金属電極7との間には、必要輝度に応じた一定電流が供給される。 Thus, between each transparent electrode 2 and the metal electrodes 7, a constant current corresponding to the necessary luminance is supplied.

【0037】また、輝度補正データ記憶部14Bに上述した画素6の面積、発光色、発光効率毎に印加されるべき電圧レベル又はパルス幅を補正データとして画素毎にテーブル形式で格納しておき、表示データに対応する補正データによりデータ出力回路17の出力を制御するようにしてもよい。 Further, the area of ​​the pixel 6 described above on the luminance correction data storage unit 14B, the emission color may be stored in a table format for each pixel the voltage level or pulse width to be applied for each emission efficiency as the correction data, it may be controlled the output of the data output circuit 17 by the correction data corresponding to the display data. なお、補正データとしては、画素6の面積、発光色、発光効率の組合せに応じた電圧レベル又はパルス幅のデータとしてもよい。 Incidentally, as the correction data, the area of ​​the pixel 6, the emission color may be data voltage level or pulse width corresponding to a combination of the luminous efficiency.

【0038】 [0038]

【発明の効果】以上の説明で明らかなように、本発明によれば、画素の面積、発光色、発光効率が異なっても、 As is apparent from the foregoing description, according to the present invention, the area of ​​the pixel, the emission color, even the luminous efficiency is different,
各画素の電流密度の平均値を同等にして各画素の輝度を均一にでき、表示品位を保つことができるという効果を奏する。 The average value of the current density of each pixel in the same can the brightness of each pixel uniform, an effect that it is possible to maintain the display quality.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明による駆動回路が採用されるEL表示装置の一構成例を示す平面図 Plan view showing a configuration example of an EL display device [1] driving circuit according to the present invention is employed

【図2】図1の部分拡大側断面図 Figure 2 is a partial enlarged side sectional view of FIG. 1

【図3】本発明によるEL表示装置の駆動回路の実施の形態を示すブロック図 Block diagram illustrating an embodiment of a driving circuit of an EL display device according to the present invention; FIG

【図4】有機EL素子を用いたEL表示装置の概略構成を示す側断面図 Figure 4 is a side sectional view showing a schematic structure of an EL display device using an organic EL element

【符号の説明】 DESCRIPTION OF SYMBOLS

2…透明電極、5…有機層、6…画素、7…金属電極、 2 ... transparent electrode, 5: organic layer, 6 ... pixel, 7 ... metal electrode,
11…駆動回路、14A…表示データ記憶部、14B… 11 ... drive circuit, 14A ... display data storage unit, 14B ...
輝度補正データ記憶部。 Luminance correction data storage unit.

Claims (4)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 発光部として面積の異なる画素が形成されるように、少なくとも一方の電極が透光性部材からなる2つの電極間に有機層が積層形成され、一方の電極を陽極として電圧を印加し、前記2つの電極間に一定の電流を流して所望の表示を行うEL表示装置の駆動回路において、 前記画素それぞれの面積に応じた補正データが格納された輝度補正データ記憶部を備え、 表示データに対応した各画素の補正データを前記輝度補正データ記憶部から読み出し、この読み出した補正データに基づき、前記電極間に流れる電流の通電時間を一定として前記電極間の電流値を前記画素毎に可変制御することを特徴とするEL表示装置の駆動回路。 1. A such that different pixels in area as the light-emitting portion is formed, the organic layer is laminated between two electrodes at least one electrode made of a transparent member, a voltage one electrode as an anode applied to, in a driver circuit of an EL display device which performs a desired display by applying a constant current between the two electrodes, comprising a luminance correction data storage unit in which the correction data is stored in accordance with the area of ​​the pixel, respectively, reads out the correction data of each pixel corresponding to the display data from the luminance correction data storage unit, based on the correction data thus read out, each pixel of the current value between the electrodes energizing time of the current flowing between the electrodes is constant driving circuit of an EL display device characterized by variably controlling the.
  2. 【請求項2】 発光部として面積の異なる画素が形成されるように、少なくとも一方の電極が透光性部材からなる2つの電極間に有機層が積層形成され、一方の電極を陽極として電圧を印加し、前記2つの電極間に一定の電流を流して所望の表示を行うEL表示装置の駆動回路において、 前記画素それぞれの面積に応じた補正データが格納された輝度補正データ記憶部を備え、 表示データに対応した各画素の補正データを前記輝度補正データ記憶部から読み出し、この読み出した補正データに基づき、前記画素のそれぞれに流れる電流値を一定として前記電極間に流れる電流の通電時間を前記画素毎に可変制御することを特徴とするEL表示装置の駆動回路。 2. As different pixels of the area as the light-emitting portion is formed, the organic layer is laminated between two electrodes at least one electrode made of a transparent member, a voltage one electrode as an anode applied to, in a driver circuit of an EL display device which performs a desired display by applying a constant current between the two electrodes, comprising a luminance correction data storage unit in which the correction data is stored in accordance with the area of ​​the pixel, respectively, reads out the correction data of each pixel corresponding to the display data from the luminance correction data storage unit, based on the correction data thus read out, the energization time of the current flowing between the electrodes a current value flowing through each of the pixels is constant driving circuit of an EL display device characterized by variably controlled for each pixel.
  3. 【請求項3】 前記補正データが前記画素の発光色に応じたデータからなる請求項1又は2記載のEL表示装置の駆動回路。 Wherein said correction data driving circuit of an EL display device emission colors consisting response data to claim 1 or 2, wherein said pixel.
  4. 【請求項4】 前記補正データが前記画素の発光効率に応じたデータからなる請求項1又は2記載のEL表示装置の駆動回路。 Wherein said correction data driving circuit of an EL display device luminous efficiency consists response data to claim 1 or 2, wherein said pixel.
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