JP2000077191A - Display device - Google Patents

Display device

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Publication number
JP2000077191A
JP2000077191A JP24524498A JP24524498A JP2000077191A JP 2000077191 A JP2000077191 A JP 2000077191A JP 24524498 A JP24524498 A JP 24524498A JP 24524498 A JP24524498 A JP 24524498A JP 2000077191 A JP2000077191 A JP 2000077191A
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Prior art keywords
light
layer
tft
organic el
display device
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JP24524498A
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Japanese (ja)
Inventor
Naoaki Furumiya
Tsutomu Yamada
直明 古宮
努 山田
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Sanyo Electric Co Ltd
三洋電機株式会社
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L2251/00Indexing scheme relating to organic semiconductor devices covered by group H01L51/00
    • H01L2251/50Organic light emitting devices
    • H01L2251/53Structure
    • H01L2251/5307Structure specially adapted for controlling the direction of light emission
    • H01L2251/5315Top emission
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L27/00Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/28Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including components using organic materials as the active part, or using a combination of organic materials with other materials as the active part
    • H01L27/32Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including components using organic materials as the active part, or using a combination of organic materials with other materials as the active part with components specially adapted for light emission, e.g. flat-panel displays using organic light-emitting diodes [OLED]
    • H01L27/3206Multi-colour light emission
    • H01L27/322Multi-colour light emission using colour filters or colour changing media [CCM]
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L27/00Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/28Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including components using organic materials as the active part, or using a combination of organic materials with other materials as the active part
    • H01L27/32Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including components using organic materials as the active part, or using a combination of organic materials with other materials as the active part with components specially adapted for light emission, e.g. flat-panel displays using organic light-emitting diodes [OLED]
    • H01L27/3241Matrix-type displays
    • H01L27/3244Active matrix displays

Abstract

PROBLEM TO BE SOLVED: To provide a display device which can be designed without any restriction on the size and capacity of TFT for driving an organic electroluminescent(EL) element.
SOLUTION: The display device formed on an insulating substrate 2 is provided with a TFT provided with a source electrode 9 and a drain electrode 10, and an organic EL element which is formed by laminating an anode 12 connected to the source electrode 9 or the drain electrode 10 and made of Mo and ITO and a cathode 17 composed of a light emitting element layer made of an organic material and ITO in this order and is driven by the TFT. A color filter 22 is disposed on the anode 12 side in the organic EL element.
COPYRIGHT: (C)2000,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、基板上に、エレクトロルミネッセンス(Electro Luminescence:以下、 BACKGROUND OF THE INVENTION The present invention has, on a substrate, an electroluminescent (Electro Luminescence: less,
「EL」と称する。 It referred to as "EL". )素子及び薄膜トランジスタ(Thin ) Element and a thin film transistor (Thin
Film Transistor:以下、「TFT」と称する。 Film Transistor: hereinafter referred to as "TFT". )を備えた表示装置に関する。 ) It relates to a display device equipped with.

【0002】 [0002]

【従来の技術】近年、EL素子を用いた表示装置が、C In recent years, display devices using EL elements, C
RTやLCDに代わる表示装置として注目されている。 It has been attracting attention as a display device to replace the RT and LCD.

【0003】図3に、従来のEL素子及びTFTを備えたカラー表示装置の断面図を示す。 [0003] FIG. 3 shows a cross-sectional view of a color display device having a conventional EL element and TFT.

【0004】同図に示す如く、ガラスや合成樹脂などから成る絶縁性基板2上に、ゲート電極3、ゲート絶縁膜4、ソース領域6及びドレイン領域7を備えた能動層5、層間絶縁膜8、ソース領域6及びドレイン領域7にそれぞれ接続されたソース電極9及びドレイン電極1 [0004] As shown in the figure, on the insulating substrate 2 made of glass or synthetic resin, the gate electrode 3, the gate insulating film 4, an active layer 5 having a source region 6 and drain region 7, an interlayer insulating film 8 , the source electrode 9 and a drain electrode 1 connected to the source region 6 and drain region 7
0、平坦化絶縁膜11を順次形成してなるTFTを形成する。 0, to form a TFT formed by sequentially forming a planarization insulating film 11. このTFTは、そのソース電極9が有機EL素子のITO(Indium Tin Oxide)からなる陽極12に接続されており、有機EL素子のスイッチング素子として機能する。 This TFT has its source electrode 9 is connected to the anode 12 made of ITO of the organic EL element (Indium Tin Oxide), and functions as a switching element of the organic EL element.

【0005】このTFTの上に有機EL素子を形成する。 [0005] forming an organic EL element on the TFT.

【0006】有機EL素子は、TFTのソース電極に接続されたITO等の透明導電材料から成る陽極12、M [0006] The organic EL element includes an anode 12 made of a transparent conductive material such as ITO which is connected to the source electrode of the TFT, M
TDATA(4,4'-bis( 3-methylphenylphenylamino)b TDATA (4,4'-bis (3-methylphenylphenylamino) b
iphenyl)から成る第2ホール輸送層16、TPD(4, The second hole transport layer 16, TPD (4 consisting iphenyl),
4',4”-tris(3-methylphenylphenylamino)triphenylan 4 ', 4 "-tris (3-methylphenylphenylamino) triphenylan
ine)からなる第1ホール輸送層15、発光層14、B The first hole transport layer 15 made of ine), light-emitting layer 14, B
ebq2から成る電子輸送層13、マグネシウム・インジウム合金(MgIn)から成る陰極17がこの順番で積層形成されている。 Electron transport layer 13 made of Ebq2, cathode 17 made of magnesium-indium alloy (MgIn) are laminated in this order. このように、各層13,14,1 In this way, each layer 13,14,1
5,16は有機化合物から成り、その各層と陽極12及び陰極17とによって有機EL素子が構成されている。 5,16 is made of an organic compound, an organic EL element is constituted by the each layer and the anode 12 and cathode 17.

【0007】その有機EL素子は、陽極12から注入されたホールと、陰極17から注入された電子とが発光層14の内部で再結合し、発光層14を形成する有機分子を励起して励起子が生じる。 [0007] The organic EL element, holes injected from the anode 12 and electrons injected from the cathode 17 are recombined inside the light-emitting layer 14, the excitation to excite organic molecules forming the emissive layer 14 child occurs. この励起子が放射失活する過程で発光層14から光が放たれ、この光が透明な陽極12から透明絶縁基板2を介して外部へ出射される(図中、矢印方向)。 The excitons light emitted from the light emitting layer 14 in the process of radiative deactivation, the light is emitted to the outside through the transparent insulating substrate 2 from the transparent anode 12 (in the figure, arrow).

【0008】 [0008]

【発明が解決しようとする課題】ところで、上述の従来の表示装置の構造では、有機EL素子からの光放出の方向がTFTを設けた絶縁性基板2側であるため、放出される光がTFTによって遮断されてしまい表示画素の開口率が低下してしまうという欠点があった。 [SUMMARY OF THE INVENTION Incidentally, in the structure of the conventional display device described above, since the direction of light emission from the organic EL element is an insulating substrate 2 side provided with the TFT, light emitted is TFT the aperture ratio of the display pixels will be cut off has a drawback that decreases by.

【0009】また従来の構造であると、発光光を遮断しない程度にTFTを極力小さくしなければならないという制約があるため、TFTのサイズ及びTFTの能力にも制限があった。 [0009] If it is the conventional structure, since there is a limitation that must be as small as possible a TFT so as not to block the emitted light, there are limits on the size and TFT ability of the TFT.

【0010】そこで本発明は、上記の従来の欠点に鑑みて為されたものであり、表示画素の開口率を向上させるとともに、EL素子を駆動するTFTのサイズや駆動能力の決定に自由度の増大が図れる表示装置を提供することを目的とする。 [0010] The present invention has been made in consideration of the conventional drawbacks described above, improves the aperture ratio of the display pixels, the degree of freedom in determining the size and driving ability of the TFT for driving the EL element and to provide a display device which increase can be achieved.

【0011】 [0011]

【課題を解決するための手段】本発明の表示装置は、基板上に、ソース及びドレインを備えた薄膜トランジスタと、該薄膜トランジスタの上層に、該薄膜トランジスタのソース又はドレインに接続され不透明導電材料からなる陽極、発光素子層、及び透明導電材料からなる陰極を順に積層して成り前記薄膜トランジスタによって駆動されるエレクトロルミネッセンス素子と、を備えているものである。 Display device of the present invention, in order to solve the problem] has, on a substrate, an anode and a thin film transistor comprising a source and a drain, the upper layer of the thin film transistor, comprising a source or opaque conductive material is connected to the drain of the thin film transistors are those provided with the light emitting element layer, and the electroluminescent element a cathode made of a transparent conductive material is driven by the thin film transistor formed by laminating in this order, the.

【0012】また、前記エレクトロルミネッセンス素子の前記陰極側に色要素を備えた透明基板を配置し、該透明基板上の色要素はカラーフィルタ層又は蛍光変換層である。 Further, a transparent substrate having a color element on the cathode side of the electroluminescence element is arranged, the color elements on the transparent substrate is a color filter layer or a fluorescence conversion layer.

【0013】 [0013]

【発明の実施の形態】<第1の実施の形態>本発明の表示装置について以下に説明する。 DETAILED DESCRIPTION OF THE INVENTION <First Embodiment> described below the display device of the present invention.

【0014】図1は第1の実施の形態であり色要素としてカラーフィルタを備えた表示装置の断面図である。 [0014] Figure 1 is a cross-sectional view of a display device comprising the color filter as is color elements in the form of the first embodiment.

【0015】各表示画素1は、ガラスや合成樹脂などから成る絶縁基板、又は絶縁性薄膜であるSiN膜、Si [0015] Each display pixel 1, a glass or an insulating substrate made of a synthetic resin, or an insulating thin film in which the SiN film, Si
2膜等を堆積して表面が絶縁性を有する導電性基板あるいは半導体基板等の絶縁性基板2上に、TFT及び有機EL素子を積層形成して成っており、各表示画素がマトリクス状に配置されてカラー表示パネルを形成する。 O 2 surface by depositing a film or the like on an insulating substrate 2 such as a conductive substrate or a semiconductor substrate having an insulating property, and made by laminating forming a TFT and the organic EL element, each display pixel matrix They are arranged to form a color display panel.
絶縁性基板2は透明でも不透明でも良い。 Insulating substrate 2 may be transparent or opaque. TFTは、図1に示すように、ゲート電極3をゲート絶縁膜4の下に設けたいわゆるボトムゲート型のTFTであり、能動層として多結晶シリコン膜を用いた従来の構造と同様であるので説明を省略する。 TFT, as shown in FIG. 1, a so-called bottom gate type TFT in which a gate electrode 3 under the gate insulating film 4 is the same as the conventional structure using a polycrystalline silicon film as the active layer description thereof will be omitted.

【0016】TFTのソース電極9は有機EL素子の陽極12に接続されている。 [0016] The source electrode 9 of the TFT is connected to the anode 12 of the organic EL element.

【0017】その陽極12は、平坦化絶縁膜11及びこの平坦化絶縁膜11に設けたコンタクトホールを含む面に形成した不透明導電材料であるモリブデン(Mo)1 [0017] The anode 12, the planarizing insulating film 11 and the flattening insulating film 11 of molybdenum is opaque conductive material formed on the surface including the contact hole formed (Mo) 1
2'より成っており、その上にITOを堆積する。 And consist 2 ', depositing ITO thereon. Mo Mo
とITOとは同形状でよい。 It may be the same shape and ITO. Moは、発光層で発生した光を反射し、効率よく光を放出するために設けられる。 Mo reflects light generated in the light emitting layer is provided in order to efficiently emit light.
不透明導電材料は、Moに限定されることなく、アルミニウム(Al)、銀(Ag)等の金属でもよい。 The opaque conductive material is not limited to Mo, aluminum (Al), may be a metal such as silver (Ag). また、 Also,
その上にITOを設けたのは、仕事関数が高くMoと発光素子層の発光を効率よく行うためである。 As was provided an ITO on is to efficiently perform emission work function higher Mo and the light emitting element layer.

【0018】有機EL素子は、ソース電極9に接続された陽極12とITO等の透明導電膜から成る陰極17との間に、Bebq2から成る電子輸送層13、発光層1 [0018] The organic EL element, between the cathode 17 made of a transparent conductive film of the anode 12 and the ITO or the like connected to the source electrode 9, the electron transport layer 13 made of Bebq2, the light-emitting layer 1
4、TPD(4,4',4”-tris(3-methylphenylphenylami 4, TPD (4,4 ', 4 "-tris (3-methylphenylphenylami
no)triphenylanine)からなる第1ホール輸送層15、 The first hole transport layer 15 made of no) triphenylanine),
MTDATA(4,4'-bis(3-methylphenylphenylamino) MTDATA (4,4'-bis (3-methylphenylphenylamino)
biphenyl)から成る第2ホール輸送層16、リチウム、 The second hole transport layer 16 made of biphenyl), lithium,
ナトリウム等のアルカリ金属、カリウム、カルシウム、 Alkali metal, potassium, calcium such as sodium,
マグネシウム等のアルカリ土類金属、又はこれら金属のフッ素化合物等の仕事関数の高い材料からなるバッファ層25からなる発光素子層がこの順番で積層形成されて成る。 Alkaline earth metals such as magnesium metal, or a light emitting element layer consisting of a buffer layer 25 made of a material having high work function of the fluorine compounds of these metals is formed by laminated in this order.

【0019】有機EL素子から発光される光は透明な陰極17から外部(図中、紙面上方向)へ出射される。 The light emitted from the organic EL element is emitted to the outside from the transparent cathode 17 (in the figure, the upward direction of the paper surface). 即ち、TFTの存在しない側に発光する。 That is, light emission on the side that does not exist of the TFT. なお、陰極17 It should be noted that the cathode 17
は共通電極であり、また発光層14、電子輸送層13、 It is a common electrode, also the light-emitting layer 14, electron transport layer 13,
各ホール輸送層15,16、バッファ層25は絶縁膜1 Each hole transport layer 15 and 16, the buffer layer 25 is an insulating film 1
8にて隣接する各表示画素1間で絶縁されている。 It is insulated between the respective display pixels 1 adjacent at 8.

【0020】この有機EL表示装置の表示パネルに色要素としてカラーフィルタ22を設ける。 The provision of the color filter 22 as color elements in the display panel of the organic EL display device.

【0021】図1に示すように、陰極17側に、透明フィルム又はガラス基板等の透明絶縁基板21上に赤(R)、緑(G)、青(B)を備えたカラーフィルタ2 As shown in FIG. 1, the cathode 17 side, red (R) on a transparent insulating substrate 21 such as a transparent film or glass substrate, a color filter 2 having a green (G), and blue (B)
2を設ける。 2 provided.

【0022】このカラーフィルタ22は、有機EL素子の陰極17側にその周辺を接着機能を有するシール剤にて接着して固定する。 [0022] The color filter 22 is adhered and fixed to the periphery to the cathode 17 side of the organic EL element at the sealing agent having a bonding function. なお、カラーフィルタ22は有機EL素子とTFTからなる表示画素1に対応して各色が設けられている。 The color filter 22 has the respective colors are provided corresponding to the display pixel 1 consisting of an organic EL element and TFT. 各色間には光を遮断するブラックマトリックス(BM)23が備えられていても良い。 A black matrix (BM) 23 may be provided for blocking light between each color.

【0023】有機EL素子の発光層からの発光光は、カラーフィルタ22を通ってそれぞれの色を図の矢印の方向に出射する。 The light emitted from the light-emitting layer of the organic EL element emits each color through a color filter 22 in the direction of the arrow.

【0024】ここで、有機EL素子の発光層の発光材料について説明する。 [0024] Here will be described the light emitting material of the emission layer of the organic EL element.

【0025】有機EL素子の発光層14の発光材料は、 The light emitting material of the light-emitting layer 14 of the organic EL element,
有機EL素子上に設けた色要素に応じて選択する。 Selected according to the color element provided on the organic EL element. 即ち、本実施形態の場合のように、R,G,Bを備えたカラーフィルタを用いる場合には、有機EL素子から発光する光として白色光を用いる。 That is, as in the case of the present embodiment, in the case of using a color filter with R, G, and B are used white light as the light emitted from the organic EL element.

【0026】白色光を発光させるためには、発光層14 [0026] In order to emit white light, the light emitting layer 14
の材料としては、ZnBTZ錯体を用いたり、あるいは積層体のTPD(芳香族ジアミン)/p−EtTAZ The materials, or using a ZnBTZ complex, or a laminate TPD (aromatic diamine) / p-EtTAZ
(1,2,4−トリアゾール誘導体)/Alq(ただし、「Alq」は赤色発光色素であるニールレッドで部分的にドープすることを意味する。)を用いることにより実現できる。 (1,2,4-triazole derivative) / Alq (where "Alq" is meant to. That partially doped with Neal red which is a red light emitting pigment) can be achieved by using a.

【0027】こうして、カラーフィルタ22を設けた基板21側から光を放出することができるので、TFTによって光が遮断されることがないため表示画素の開口率を最大限に設計することが可能となるとともに、EL素子を駆動するTFTのサイズや駆動能力の決定に自由度の増大が図れる。 [0027] Thus, it is possible to emit light from the substrate 21 side provided with the color filter 22, it can be designed to maximize the aperture ratio of the display pixel since no light is blocked by the TFT together it becomes, thereby the increase in the degree of freedom in determining the size and driving ability of the TFT for driving the EL element.

【0028】また、表示画素の開口率を向上できるので、明るい表示を得るために電流密度を大きくする必要もなくなり有機EL素子の寿命を長くすることができる。 Further, since it improves the aperture ratio of the display pixels, it is possible to increase the life of the necessary eliminating the organic EL element to increase the current density in order to obtain a bright display.

【0029】また、有機EL素子の発光層として用いる発光材料は本実施形態の場合には、白色発光材料を1種類用いるだけでよく、また、透明基板21上にR,G, Further, when the light emitting material used as a light-emitting layer of the organic EL element of the present embodiment, a white light emitting material may only use one type, addition, R on the transparent substrate 21, G,
Bの3色からなるカラーフィルタを配置してそのカラーフィルタ形成面と有機EL素子の陰極側とを接着するだけであるから、従来の如く3原色を発光するために有機EL素子層内に3種類の発光層の材料を形成していたのに比べて非常に工程が簡略化できる。 Since only by arranging a color filter of three colors of B to bond the cathode side of the color filter forming surface and the organic EL element, the organic EL element layer to emit three primary colors as in the conventional 3 very process can be simplified as compared to the other to form a material of the type of the light-emitting layer.

【0030】更に、発光光が陰極側に設けたカラーフィルタ側から表示画素の色として出射されるので従来の如くTFT基板側から出射されるよりも色が発光される面積が大きくなり明るく鮮明なカラー表示を得ることができる。 Furthermore, emitted light is vivid bright becomes large area color is emitted than is emitted from the TFT substrate side as in the conventional so is emitted as color of the display pixels from the color filter side which is provided on the cathode side it is possible to obtain a color display. <第2の実施の形態>図2に、色要素として蛍光変換層を用いた場合の表示装置の断面図を示す。 The <Second Embodiment> FIG. 2 illustrates a cross-sectional view of a display device in the case of using the fluorescent conversion layer as the color elements.

【0031】同図に示す如く、第1の実施形態と異なる点は、透明基板21上にカラーフィルタ22に代えて蛍光変換層24を形成した点、発光層14の材料が例えば青色発光材料を用いた点である。 [0031] As shown in the figure, is different from the first embodiment in that the formation of the fluorescence conversion layer 24 in place of the color filter 22 on the transparent substrate 21, the material of the light-emitting layer 14, for example, a blue light-emitting material is a point that was used.

【0032】ガラス基板等の透明基板21上に蒸着法により有機材料を蒸着して蛍光変換層24を形成する。 [0032] forming a fluorescence conversion layer 24 by depositing organic material by evaporation on a transparent substrate 21 such as a glass substrate. そしてその透明基板21を陰極17上に貼り付ける。 And paste the transparent substrate 21 on the cathode 17. 以下に、蛍光変換層24として有機EL素子の発光層を青色が発光される材料とした場合について説明する。 Hereinafter, a light emitting layer of the organic EL element of blue be described for the case where the material to be emitted as fluorescence conversion layer 24.

【0033】蛍光変換層24は、照射された着色光の色を他の色に変換する機能を有している。 The fluorescence conversion layer 24 has a function of converting the color of the irradiated colored light to another color. 従って、発光層14に青色発光の材料を用いてカラー表示装置から3原色のR,G,Bを得ようとする場合には、蛍光変換層2 Therefore, when the three primary colors of R from the color display device using a blue light emitting material in the light emitting layer 14, G, sought the B to the fluorescent conversion layer 2
4は、青色が赤色または緑色に変換される材料を用いて形成しなければならない。 4, must be formed of a material that blue is converted to red or green.

【0034】有機EL素子の発光層14から発光した青色光を赤色光に変換する場合には、その発光層を4−ジシアノメチレン−2−メチル−6−(p−ジメチルアミノスチルリン)−4H−ピラン(DCM)等を用いて形成する。 [0034] When converting blue light emitted from the light emitting layer 14 of the organic EL device to red light, the luminescent layer 4-dicyanomethylene-2-methyl-6-(p-dimethylamino still phosphorus) -4H - formed using pyran (DCM) and the like. そうすることにより、表示画素から赤色を出射することができる。 By doing so, it is possible to emit red from the display pixels.

【0035】次に、有機EL素子の発光層14から発光した青色光を緑色光に変換する材料として、2,3, Next, as a material for converting blue light emitted from the light emitting layer 14 of the organic EL element to green light, 2,3,
5,6−1H,4H−テトラヒドロ−8−トリフロルメチルキノリジノ(9,9a,1−gh)クマリン等を用いて形成する。 5,6-1H, 4H- tetrahydro-8-tri Furoru methyl quinolinium Gino (9,9a, 1-gh) is formed by using a coumarin. 表示画素から緑色を出射することができる。 It can emit green from the display pixels.

【0036】また、有機EL素子の発光層14から青色光を放出する表示画素には、青色の色純度を高めるために青色変換層を設けても良い。 Further, the display pixel to emit blue light from the light emitting layer 14 of the organic EL element, may be provided a blue conversion layer in order to enhance the blue color purity. その場合には例えば次の青色発光材料を形成する。 To form, for example, following the blue light-emitting material in that case.

【0037】また、青色発光材料としては、オキサジアゾール(OXD)、アゾメチン−亜鉛錯体(AZM)、 Further, as a blue emitting material, oxadiazole (OXD), azomethine - zinc complex (AZM),
Al−キノリン混合配位子錯体+ペリレン等を用いる。 Using Al- quinoline mixed ligand complexes + perylene.

【0038】こうして有機EL素子の発光層として用いる発光材料は、本実施の形態の場合には青色発光材料1 [0038] Thus the light emitting material used as a light-emitting layer of the organic EL device, in the case of this embodiment the blue light emitting material 1
種類を用いるだけでよく、また、透明基板21上に3種類の蛍光変換材料を1層形成するだけであるから、従来の如く3原色を発光するために有機EL素子層内に3種類の発光層の材料を形成していたのに比べて非常に工程が簡略化できる。 We are only using the type, also because only one layer forming a three fluorescent conversion material on the transparent substrate 21, three in the organic EL element layer to emit three primary colors as in the conventional light emitting very process can be simplified as compared to the other to form a material of the layer.

【0039】なお、本実施の形態においては、発光層1 [0039] In the present embodiment, the light-emitting layer 1
4から発光する光が青色の場合について説明したが、本発明はそれに限定されるものではなく、発光層14からの光は赤色でも緑色でも良い。 While light emitted from the 4 has been described for the case of blue, the present invention is not limited thereto, the light from the light-emitting layer 14 may be a green color red. その際、赤色の光を発光する発光層とする場合には赤色を青色及び緑色に変換する材料から成る蛍光変換層を設け、緑色の光を発光する発光層とする場合には緑色を赤色及び青色に変換する材料から成る蛍光変換層を設ける。 At that time, in the case of the light-emitting layer that emits red light is provided a fluorescent conversion layer made of a material that converts the red to blue and green, red and green in the case of the light-emitting layer that emits green light providing a fluorescence conversion layer made of a material that converts blue.

【0040】このように、蛍光変換層24を設けた基板21側から光を放出することができるので、TFTによって光が遮断されることがないため表示画素の開口率を最大限に設計することが可能となるとともに、TFTのサイズや駆動能力の決定に自由度の増大が図れる。 [0040] Thus, it is possible to emit light from the substrate 21 side provided with the fluorescence conversion layer 24, be designed to maximize the aperture ratio of the display pixel for never light is blocked by the TFT together is possible, increasing the degree of freedom in determining the size and the drive capability of the TFT can be reduced.

【0041】また、表示画素の開口率を向上できるので、明るい表示を得るために電流密度を大きくする必要もなくなり有機EL素子の寿命を長くすることができる。 Further, since it improves the aperture ratio of the display pixels, it is possible to increase the life of the necessary eliminating the organic EL element to increase the current density in order to obtain a bright display.

【0042】更に、本実施の形態においても、発光光が陽極に設けた蛍光変換層側から出射されるので従来の如くTFT基板側から出射されるよりも色を発光する面積が大きくなり明るく鮮明なカラー表示を得ることができる。 [0042] Further, also in the present embodiment, clear bright large area whose emission colors than is emitted from the TFT substrate side as in the conventional so emitted from the fluorescent conversion layer side of the light-emitting light is provided on the anode it is possible to obtain a color display.

【0043】なお、上述の各実施の形態においては、色要素としてカラーフィルタ又は蛍光変換層を用いた場合を示したが、カラー表示を必要としない場合には、カラーフィルタ及び蛍光変換層は不要である。 [0043] In each embodiment described above, the case of using a color filter or a fluorescence conversion layer as the color component, if you do not need a color display, color filters and fluorescence conversion layer required it is.

【0044】また、上述の各実施の形態においては、T [0044] Further, in the embodiments described above, T
FTの構造はボトムゲート型について説明したが本発明はそれに限るものではなく、ゲート電極が能動層の上方に設けられるいわゆるトップゲート型でもよい。 Structure of FT has been described bottom gate type present invention is not limited thereto, the gate electrode may be a so-called top gate type provided above the active layer.

【0045】 [0045]

【発明の効果】本発明の表示装置によれば、有機EL素子からの光放出の方向がTFTを設けていない透明絶縁性基板側であるため、放出される光がTFTによって遮断されることがなく表示画素の開口率が低下することがない。 According to the display device of the present invention, since the direction of light emission from the organic EL element is a transparent insulating substrate provided with no TFT, that light emitted is cut off by the TFT without the aperture ratio of the display pixel is not to be reduced.

【0046】また、TFTが発光光を遮断することがないので、TFTの大きさのサイズ及びTFTの能力を最大限にすることが可能である。 [0046] Further, since no TFT blocks the emitted light, it is possible to maximize the size size and TFT's ability of the TFT.

【0047】更に、開口率が大きくできることから明るい表示を得るために電流密度を大きくする必要もなくなり有機EL素子の寿命を長くすることができる。 [0047] Further, the aperture ratio can increase the life of even eliminates the organic EL element necessary to increase the current density in order to obtain a bright display because it can be increased.

【0048】更にまた、発光光が陰極側に設けた色要素側から出射されるので、従来の如くTFT基板側から出射されるよりも色面積が大きくなり明るく鮮明なカラー表示を得ることができる。 [0048] Furthermore, since the emitted light is emitted from the color component side provided on the cathode side, it can be color area than is emitted from the conventional as TFT substrate side to obtain a bright and clear color display increases .

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

【図1】本発明の表示装置の第1実施形態を示す断面図である。 1 is a cross-sectional view showing a first embodiment of a display device of the present invention.

【図2】本発明の表示装置の第2実施形態を示す断面図である。 2 is a sectional view showing a second embodiment of the display device of the present invention.

【図3】従来の表示装置の断面図である。 3 is a cross-sectional view of a conventional display device.

【符号の説明】 DESCRIPTION OF SYMBOLS

2 基板 12 陽極 14 発光層 17 陰極 22 カラーフィルタ 24 蛍光変換層 2 substrate 12 anode 14 emitting layer 17 cathode 22 color filter 24 fluorescence conversion layer

───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 3K007 AB00 AB04 BA06 BB00 BB06 CA01 CA03 CB01 DA00 DB03 EB00 5C094 AA08 AA37 BA03 BA27 CA19 EA04 ED02 FB01 HA10 ────────────────────────────────────────────────── ─── front page of continued F-term (reference) 3K007 AB00 AB04 BA06 BB00 BB06 CA01 CA03 CB01 DA00 DB03 EB00 5C094 AA08 AA37 BA03 BA27 CA19 EA04 ED02 FB01 HA10

Claims (2)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 基板上に、ソース及びドレインを備えた薄膜トランジスタと、該薄膜トランジスタの上層に、該薄膜トランジスタのソース又はドレインに接続され不透明導電材料からなる陽極、発光素子層、及び透明導電材料からなる陰極を順に積層して成り、前記薄膜トランジスタによって駆動されるエレクトロルミネッセンス素子と、を備えていることを特徴とする表示装置。 To 1. A substrate, a thin film transistor having a source and a drain, the upper layer of the thin film transistor, comprising a source of the thin film transistor or an anode made of a transparent conductive material is connected to the drain, the light emitting element layer, and a transparent conductive material formed by laminating a cathode in this order, the display device characterized in that it and a electroluminescent device is driven by the thin film transistor.
  2. 【請求項2】 前記エレクトロルミネッセンス素子の前記陰極側に色要素を備えた透明基板を配置し、該透明基板上の色要素はカラーフィルタ層又は蛍光変換層であることを特徴とする請求項1記載の表示装置。 Wherein placing the transparent substrate having a color element on the cathode side of the electroluminescent device, according to claim 1 color element on the transparent substrate, characterized in that the color filter layer or the fluorescent conversion layer the display device according.
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