JP2010102881A - Organic electroluminescent display device and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce an impact from electrostatic discharge. <P>SOLUTION: A substrate 10 is prepared that includes a display area 12 and a peripheral region 14 that encircles the display area 12. The display area 12 is formed with a plurality of pixel electrodes 16 and a plurality of thin-film transistors 18 corresponding to the pixel electrodes 16. The peripheral region 14 is formed with drive circuits 20 for driving the thin-film transistors 18 and with an organic material film 24 for covering the thin-film transistors 18 and drive circuits 20. A bank 26 for encircling at least a portion of each of the plurality of pixel electrodes 16 is formed of an organic material. A luminous layer 30 is each formed within a plurality of regions encircled by the bank 26 and above the plurality of pixel electrodes 16. Counter electrodes 32 are formed above the plurality of pixel electrodes 16 and above the luminous layers 30. During the process of forming the bank 26, a protection layer 28 for covering the drive circuits 20 is formed simultaneously with the formation of the bank 26. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an organic electroluminescence display device and a manufacturing method thereof.

  In the manufacturing process of an organic electroluminescence display device (hereinafter referred to as “organic EL display device”), various processes such as applying an organic material to the substrate and curing it are repeated, so the substrate is handled many times. Electrostatic discharge occurs when the substrate leaves the stage. A TFT (Thin Film Transistor) for switching and a drive circuit are formed on the substrate, and it has been a problem to reduce the influence of these electrostatic discharges.

Patent Document 1 discloses that an electrostatic breakdown inducing portion is formed outside the panel region of the substrate, thereby preventing electrostatic breakdown from being exerted on the display pixels and the drive circuit inside the panel region. . However, there is a problem that not only an additional process for forming the electrostatic breakdown induction part is necessary, but also a region for forming the electrostatic breakdown induction part must be secured, so that the apparatus becomes large.
JP 2007-163818 A

  The present invention aims to reduce the effects of electrostatic discharge.

  (1) A method for manufacturing an organic EL display device according to the present invention includes a display region and a peripheral region surrounding the display region, and the display region includes a plurality of pixel electrodes and a plurality of pixel electrodes corresponding to the plurality of pixel electrodes. Forming a substrate on which the thin film transistor is formed, a drive circuit for driving the plurality of thin film transistors is formed in the peripheral region, and an inorganic material film covering the thin film transistor and the drive circuit is formed; Forming a bank surrounding at least a part of each of the pixel electrodes with an organic material; forming a light emitting layer in each of the plurality of regions surrounded by the banks and above the plurality of pixel electrodes; Forming a counter electrode above the plurality of pixel electrodes and above the light emitting layer, and forming the bank with the organic material, A protective layer covering the driving circuit, characterized by simultaneously forming said banks. According to the present invention, since the driving circuit is covered with the protective layer made of an organic material, the influence from electrostatic discharge can be reduced. Moreover, since the protective layer is formed simultaneously with the formation of the bank, it can be formed without increasing the number of steps.

  (2) In the manufacturing method of the organic EL display device described in (1), the protective layer may be formed so as to cover an end surface of a peripheral edge of the substrate.

  (3) In the method of manufacturing an organic EL display device described in (1) or (2), the substrate has light transmittance, and the plurality of pixel electrodes are formed of a light transmitting material. It is good.

  (4) In the manufacturing method of the organic EL display device according to any one of (1) to (3), the method further includes a step of attaching a sealing member for sealing the display area, It is good also as attaching to the above-mentioned peripheral region and the above-mentioned protective layer.

  (5) In the method for manufacturing an organic EL display device according to any one of (1) to (3), the method further includes a step of attaching a sealing member that seals the display area, and forming the bank. In the step, the protective layer is formed so as to avoid the end portion of the substrate, and the sealing member is attached to the end portion of the substrate on the peripheral region while avoiding the protective layer. It is good.

  (6) An organic EL display device according to the present invention includes a substrate including a display region and a peripheral region surrounding the display region, a plurality of pixel electrodes and the plurality of pixel electrodes formed in the display region of the substrate. A plurality of thin film transistors corresponding to pixel electrodes; a drive circuit for driving the plurality of thin film transistors formed in the peripheral region of the substrate; an inorganic material film covering the thin film transistors and the drive circuit; and a plurality of pixels A bank made of an organic material surrounding at least a part of each of the electrodes; a light emitting layer formed in a plurality of regions surrounded by the banks and above the plurality of pixel electrodes; and the plurality of pixels A counter electrode formed above the light emitting layer above the electrode and a protection made of the organic material formed on the inorganic material film so as to cover the drive circuit And having a, the. According to the present invention, since the driving circuit is covered with the protective layer made of an organic material, the influence from electrostatic discharge can be reduced.

  (7) In the organic EL display device described in (6), the protective layer may be formed so as to cover an end surface of a peripheral edge of the substrate.

  (8) In the organic EL display device described in (6) or (7), the substrate has a light transmission property, and the plurality of pixel electrodes are formed of a light transmission material. Also good.

  (9) The organic EL display device according to any one of (6) to (8), further including a sealing member that seals the display region, wherein the sealing member is formed on the peripheral region. And it is good also as being characterized by being attached on the said protective layer.

  (10) The organic EL display device according to any one of (6) to (8), further including a sealing member that seals the display region, wherein the protective layer is an end of the substrate. The sealing member may be attached to the end portion of the substrate so as to avoid the protective layer on the peripheral region.

  Embodiments of the present invention will be described below with reference to the drawings.

  1-5 is a figure explaining the manufacturing method of the organic electroluminescence display which concerns on embodiment of this invention. 2 is a cross-sectional view taken along the line II-II of the substrate and the like shown in FIG.

  As shown in FIG. 1, a substrate 10 is prepared. The substrate 10 (for example, a glass substrate) has optical transparency. The substrate 10 includes a display area 12 and a peripheral area 14 surrounding the display area 12.

  In the display area 12, a plurality of pixel electrodes 16 and a plurality of thin film transistors 18 corresponding to the plurality of pixel electrodes 16 are formed. The thin film transistor 18 is a switch for the pixel electrode 16. The plurality of pixel electrodes 16 are formed of a light transmissive material (for example, ITO; Indium Tin Oxide). A drive circuit 20 for driving the plurality of thin film transistors 18 is formed in the peripheral region 14. Note that a wiring 22 electrically connected to the thin film transistor 18, the pixel electrode 16, and the drive circuit 20 is formed in the peripheral region 14.

An inorganic material film 24 that covers the thin film transistor 18 and the drive circuit 20 is formed on the substrate 10. The inorganic material film 24 is an electrical insulating film. For example, by forming a Si ₃ N ₄ film having a dielectric breakdown voltage of 1000 V / μm with a film thickness of 0.5 μm, the inorganic material film 24 is formed so as to withstand a voltage of 500 V.

  As shown in FIG. 3, a bank 26 surrounding (opening or exposing) at least a part of each of the plurality of pixel electrodes 16 is formed of an organic material (for example, resin). In the step of forming the bank 26, the protective layer 28 that covers the drive circuit 20 is formed simultaneously with the bank 26 by an organic material. The bank 26 and the protective layer 28 are also electrically insulating films. For example, the protective layer 28 can be formed to withstand a voltage of 600 V or more by forming an acrylic resin layer having a dielectric breakdown voltage of 300 V / μm with a film thickness of 2 μm or more.

  According to the present embodiment, since the drive circuit 20 is covered with the protective layer 28 made of an organic material in addition to the inorganic material film 24, the influence from electrostatic discharge can be reduced. In the example described above, the inorganic material film 24 and the protective layer 28 can withstand a voltage of 1100 V or more. Moreover, since the protective layer 28 is formed simultaneously with the formation of the bank 26, it can be formed without increasing the number of steps.

  The protective layer 28 is formed so as to cover the end surface of the peripheral edge of the substrate 10. By doing so, the drive circuit 20 can be protected from an electric field passing through the inside of the substrate 10.

  As shown in FIG. 4, the light emitting layer 30 is formed in each of the plurality of regions surrounded by the bank 26 and above the plurality of pixel electrodes 16. If the pixel electrode 16 is an anode, a hole transport layer may be formed before the light emitting layer 30 is formed, or a hole injection layer may be further formed before the hole transport layer is formed.

  Further, the counter electrode 32 is formed above the plurality of pixel electrodes 16 and above the light emitting layer 30. If the counter electrode 32 is a cathode, an electron transport layer may be formed before the counter electrode 32 is formed, or a counter electrode 32 may be formed after an electron injection layer is further formed after the formation of the electron transport layer. Good. An inkjet method may be applied to the formation of the light emitting layer 30, the hole transport layer, the hole injection layer, the electron transport layer, or the electron injection layer.

  As shown in FIG. 5, a sealing member 34 that seals the display region 12 is attached. The sealing member 34 is attached on the protective layer 28 on the peripheral region 14. For example, the sealing member 36 is applied by a dispenser or the like and a sealing member 34 formed by forming a recess in the glass substrate is pasted. A desiccant 38 is attached to the surface of the sealing member 34 on the sealing space side.

  The manufacturing method of the organic EL display device according to the present embodiment includes the content of a known manufacturing method of an organic EL display device in addition to the above content.

  The organic EL display device according to the present embodiment has a substrate 10. The substrate 10 is light transmissive. The substrate 10 includes a display area 12 and a peripheral area 14 surrounding the display area 12. A plurality of pixel electrodes 16 and a plurality of thin film transistors 18 corresponding to the plurality of pixel electrodes 16 are formed in the display region 12 of the substrate 10. The plurality of pixel electrodes 16 are made of a light transmissive material. That is, the organic EL display device according to the present embodiment is a bottom emission type. A drive circuit 20 for driving the plurality of thin film transistors 18 is formed in the peripheral region 14 of the substrate 10.

  An inorganic material film 24 that covers the thin film transistor 18 and the drive circuit 20 is formed on the substrate 10. A bank 26 is formed on the substrate 10 so as to surround at least a part of each of the plurality of pixel electrodes 16. The bank 26 is made of an organic material. A light emitting layer 30 is formed in each of a plurality of regions surrounded by the bank 26 and above the plurality of pixel electrodes 16. A counter electrode 32 is formed above the plurality of pixel electrodes 16 and above the light emitting layer 30. A protective layer 28 is formed so as to cover the drive circuit 20. The protective layer 28 is formed on the inorganic material film 24. The protective layer 28 is made of an organic material. The protective layer 28 is formed so as to cover the end surface of the peripheral edge of the substrate 10. The organic EL display device includes a sealing member 34 that seals the display region 12. The sealing member 34 is attached on the protective layer 28 on the peripheral region 14.

  The organic EL display device according to the present embodiment further includes a configuration that is obvious from the above manufacturing method. According to this embodiment, since the drive circuit 20 is covered with the protective layer 28 made of an organic material, the influence from electrostatic discharge can be reduced.

(Modification)
FIG. 6 is a diagram illustrating a modification of the organic EL display device according to the embodiment of the present invention and a method for manufacturing the same.

  The organic EL display device includes a sealing member 134 that seals the display region 112. The protective layer 128 is formed so as to avoid the end portion of the substrate 110. The sealing member 134 is attached to the edge of the substrate 110 on the peripheral region 114 while avoiding the protective layer 128. This modification is particularly applicable to large products.

  In the method of manufacturing the organic EL display device, the protective layer 128 is formed so as to avoid the edge of the substrate 110 in the step of forming the bank 126. Then, the sealing member 134 is attached to the end portion of the substrate 110 on the peripheral region 114 while avoiding the protective layer 128. By attaching the sealing member 134 to the substrate 110, it is possible to maintain a higher adhesive force than when attaching to the protective layer 128. The other details correspond to the contents described in the above-described embodiment.

  The present invention is not limited to the embodiment described above, and various modifications are possible. For example, the configuration described in the embodiment can be replaced with a substantially the same configuration, a configuration that exhibits the same operational effects, or a configuration that can achieve the same purpose.

It is a figure explaining the manufacturing method of the organic electroluminescence display concerning an embodiment of the invention. It is II-II sectional view taken on the line of the board | substrate etc. which are shown in FIG. It is a figure explaining the manufacturing method of the organic electroluminescence display concerning an embodiment of the invention. It is a figure explaining the manufacturing method of the organic electroluminescence display concerning an embodiment of the invention. It is a figure explaining the manufacturing method of the organic electroluminescence display concerning an embodiment of the invention. It is a figure explaining the modification of the organic electroluminescence display which concerns on embodiment of this invention, and its manufacturing method.

Explanation of symbols

  10 substrate, 12 display region, 14 peripheral region, 16 pixel electrode, 18 thin film transistor, 20 drive circuit, 22 wiring, 24 inorganic material film, 26 bank, 28 protective layer, 30 light emitting layer, 32 counter electrode, 34 sealing member, 36 sealing agent, 38 desiccant, 110 substrate, 112 display region, 114 peripheral region, 126 bank, 128 protective layer, 134 sealing member.

Claims (10)

A display region and a peripheral region surrounding the display region, wherein a plurality of pixel electrodes and a plurality of thin film transistors corresponding to the plurality of pixel electrodes are formed in the display region, and the plurality of thin film transistors are driven in the peripheral region A step of preparing a substrate on which a driving circuit is formed and an inorganic material film covering the thin film transistor and the driving circuit is formed;
Forming a bank surrounding at least a part of each of the plurality of pixel electrodes with an organic material;
Forming a light emitting layer in each of a plurality of regions surrounded by the banks and above the plurality of pixel electrodes;
Forming a counter electrode above the plurality of pixel electrodes and above the light emitting layer;
Including
In the step of forming the bank, a protective layer that covers the drive circuit is formed of the organic material at the same time as the bank, and the method for manufacturing an organic electroluminescence display device. In the manufacturing method of the organic electroluminescent display device according to claim 1,
The manufacturing method of an organic electroluminescence display device, wherein the protective layer is formed so as to cover an end surface of a peripheral edge of the substrate. In the manufacturing method of the organic electroluminescent display apparatus described in Claim 1 or 2,
The substrate has optical transparency;
A method of manufacturing an organic electroluminescence display device, wherein the plurality of pixel electrodes are formed of a light transmissive material. In the manufacturing method of the organic electroluminescent display apparatus described in any one of Claim 1 to 3,
A step of attaching a sealing member for sealing the display area;
A method for manufacturing an organic electroluminescence display device, comprising: mounting the sealing member on the peripheral region and on the protective layer. In the manufacturing method of the organic electroluminescent display apparatus described in any one of Claim 1 to 3,
A step of attaching a sealing member for sealing the display area;
In the step of forming the bank, the protective layer is formed to avoid the edge of the substrate,
A manufacturing method of an organic electroluminescence display device, wherein the sealing member is attached to the end portion of the substrate on the peripheral region while avoiding the protective layer. A substrate including a display area and a peripheral area surrounding the display area;
A plurality of pixel electrodes formed in the display area of the substrate and a plurality of thin film transistors corresponding to the plurality of pixel electrodes;
A driving circuit for driving the plurality of thin film transistors formed in the peripheral region of the substrate;
An inorganic material film covering the thin film transistor and the driving circuit;
A bank of organic material surrounding at least a portion of each of the plurality of pixel electrodes;
A light emitting layer formed in each of a plurality of regions surrounded by the bank and above the plurality of pixel electrodes;
A counter electrode formed above the plurality of pixel electrodes and above the light emitting layer;
A protective layer made of the organic material formed on the inorganic material film so as to cover the drive circuit;
An organic electroluminescence display device comprising: The organic electroluminescence display device according to claim 6,
The organic electroluminescence display device, wherein the protective layer is formed so as to cover an end surface of a peripheral edge of the substrate. In the organic electroluminescence display device according to claim 6 or 7,
The substrate has optical transparency;
The organic electroluminescence display device, wherein the plurality of pixel electrodes are made of a light transmissive material. The organic electroluminescence display device according to any one of claims 6 to 8,
A sealing member that seals the display area;
The organic electroluminescence display device, wherein the sealing member is mounted on the protective layer on the peripheral region. The organic electroluminescence display device according to any one of claims 6 to 8,
A sealing member that seals the display area;
The protective layer is formed avoiding the edge of the substrate,
The organic electroluminescence display device, wherein the sealing member is attached to the end portion of the substrate on the peripheral region while avoiding the protective layer.

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