JP2009016392A - Manufacturing method of electrooptical display device, and flexible substrate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform connection of a flexible substrate and coating with protection resin almost at the same time. <P>SOLUTION: When the flexible substrate 200 having a signal output electrode portion 230 formed on one end side of a base film 210 is electrically and mechanically connected, through a heat seal connection means 30, to a terminal portion 11a of a display panel 10 formed with a signal input electrode portion, a flap piece 211 formed by extending only the base film 210 from the signal output electrode portion 230 by a predetermined length along the depth of the terminal portion 11a is provided successively to the one end side of the flexible substrate 200, and a layer of protection resin 40 is formed on the flap piece 211, the flap piece 211 is heated and pressed together with the heat seal connection means 30 to cause the protection resin 40 to project from the flap piece 211, thereby coating the terminal portion 11a with the protection resin 40. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for manufacturing an electro-optical display device and a flexible substrate connected to a terminal portion of the electro-optical display device. More specifically, a protective resin is applied on the terminal portion as the flexible substrate is connected. It is about technology.

  The electro-optical display device includes a liquid crystal display panel, an organic EL panel, a plasma display panel, etc. In any case, a flexible substrate is connected to a display panel having a display element, and display is performed via the flexible substrate. A display drive signal is given to the panel, and FIG. 3 shows an example in which a flexible substrate is connected to the liquid crystal display panel.

  This will be described. The liquid crystal display panel 10 has a cell substrate in which a pair of electrode substrates 11 and 12 each having a transparent electrode (not shown) formed on the inner surface are bonded via a peripheral sealing material 13. Is filled with a predetermined liquid crystal substance 14.

  In this example, the terminal portion 11a is continuously provided on the one electrode substrate 11 side so as to protrude sideways. Although not shown, a display drive signal is input to the transparent electrode in the display portion in the terminal portion 11a. The signal input electrode portion is formed.

  In this case, the transparent electrode on the one electrode substrate 11 side is connected to the signal input electrode portion through the routing wiring that goes through the peripheral sealing material 13, and the transparent electrode on the other electrode substrate 11 side is in the peripheral sealing material 13. It is connected to the signal input electrode portion through the provided transfer means.

  The flexible substrate 20 includes a signal output electrode (not shown) corresponding to the signal input electrode portion of the terminal portion 11 a on one end 20 a side, and the signal output electrode and the signal input electrode portion are electrically connected via the heat seal connection means 30. , Mechanically connected.

  In many cases, the heat seal connecting means 30 is made of an anisotropic conductive film (ACF), a paste containing fine silver particles in a thermoplastic resin, or the like.

  Although not shown, the connection jig uses a heater bar with a built-in electric heater, and is included in the signal output electrode and the signal input electrode portion by pressing the heater bar from above the flexible substrate 20. Many lead electrodes are connected together.

  The other end side of the flexible substrate 20 is connected to a display control substrate (not shown), and a display drive signal output from the display control substrate is input to the liquid crystal display panel 10 via the flexible substrate 20, thereby the liquid crystal display panel 10. Are driven in a predetermined manner.

  By the way, each lead electrode included in the signal input electrode portion of the terminal portion 11a is usually formed of the same ITO (Indium Tin Oxide) as the transparent electrode in the display portion, but other than the connection portion by the heat seal connection means 30. If this portion is exposed, it disappears due to corrosion or acid corrosion due to acid or alkali, and in extreme cases, it may be disconnected.

  Therefore, conventionally, as shown in FIG. 3, a protective resin 40 such as a silicone resin or an epoxy resin is applied on the terminal portion 11a as a moisture-proof coating material, and each lead electrode included in the signal input electrode portion is applied. It is made to protect (for example, refer patent document 1, 2).

JP-A-6-289410 JP 9-33941 A

  However, since the application of the protective resin 40 is performed after the flexible substrate 20 is connected, foreign matter such as dust and human secretions may adhere to the terminal portion 11a after the connection and before the protective resin is applied. There is a concern about short circuit due to leakage, deterioration of reliability, and the like.

  Another problem is that the connection process of the flexible substrate 20 and the application process of the protective resin 40 are performed separately, which is not preferable in terms of productivity.

  Therefore, an object of the present invention is to enable connection of a flexible substrate and application of a protective resin almost simultaneously.

  In order to solve the above-described problems, the present invention provides a display panel having a terminal portion on which a signal input electrode portion for display driving is formed, and one end of one surface of a base film. A flexible substrate on which a signal output electrode portion corresponding to the signal input electrode portion is formed, and one end side of the flexible substrate is overlaid on the terminal portion, and the signal input electrode portion, the signal output electrode portion, In the method of manufacturing an electro-optical display device in which the terminal portion other than the connection portion is covered with a protective resin, the one end side of the flexible substrate. In addition, a flap piece is formed by continuously connecting only the base film from the signal output electrode portion in the depth direction of the terminal portion by a predetermined length, and the signal output of the flap piece is provided. The protective resin layer is formed on the surface on the pole side, the flap piece is heated and pressurized together with the heat seal connecting means, and the protective resin is protruded from the flap piece, except for the connection portion by the heat seal connecting means. The terminal portion is covered with a protective resin.

  In the invention of claim 1, as described in claim 2, it is preferable that an electrically insulating thermoplastic resin is used as the protective resin. More preferably, as described in claim 2, a thermoplastic resin that is the same as or similar to the thermoplastic resin contained in the heat seal connecting means may be used.

  In addition, as described in claim 4, it is preferable that the thickness of the protective resin is gradually increased from the draw base side to the tip side of the flap piece.

  The present invention also includes the flexible substrate according to claim 5. That is, the flexible substrate according to claim 5 includes a signal output electrode portion on one end side of one surface of the base film, and the signal output electrode portion is formed on a terminal portion of the display panel. In a flexible board that is electrically and mechanically connected through a heat seal connection means, a flap piece is formed by pulling out only the base film from the signal output electrode part by a predetermined length in the depth direction of the terminal part, A protective resin layer for the terminal portion is formed on a surface of the flap piece on the signal output electrode portion side.

  In the invention of claim 5, as described in claim 6, it is preferable that the layer thickness of the protective resin is gradually increased from the draw base side to the tip side of the flap piece.

  According to the method of manufacturing an electro-optical display device according to the present invention, a signal corresponding to the signal input electrode portion on one end side of one surface of the base film is formed on the terminal portion where the signal input electrode portion of the display panel is formed. When the flexible substrate on which the output electrode portion is formed is electrically and mechanically connected through the heat seal connecting means, only the base film from the signal output electrode portion is connected to the terminal portion on one end side of the flexible substrate. A flap piece drawn out by a predetermined length in the depth direction is continuously provided, a protective resin layer is formed on one surface of the flap piece, and the flap piece is heated and pressurized together with the heat seal connecting means to thereby protect the protection piece. The resin protruded from the flap piece, and the terminal portion other than the connection portion by the heat seal connection means was covered with a protective resin. More, without giving time for foreign matter to adhere to the terminal portion, it is possible to perform a coating of protective resin and the flexible board connected substantially simultaneously.

  In this case, the protective resin can be more easily protruded from the flap piece by gradually increasing the thickness of the protective resin layer from the flap base to the tip side.

  Next, an embodiment of the present invention will be described with reference to FIGS. 1A to 1C are schematic cross-sectional views for explaining the manufacturing method of the electro-optical display device of the present invention in the order of steps, and FIG. 2A is a cross-sectional view showing the printed circuit board of the present invention. FIG.2 (b) is the bottom view (figure seen from the terminal part side of the panel).

  In this embodiment as well, the electro-optical display device is the liquid crystal display panel 10 as in the conventional example described with reference to FIG. 3, but the illustration is omitted in FIGS. 1A to 1C in FIG. The signal input electrode portion provided in the terminal portion 11a on the panel side is indicated by reference numeral 11c. The signal input electrode portion 11c is arranged on the end edge 11b side of the terminal portion 11a.

  As shown in FIG. 1A, in connecting the flexible substrate 200 to the terminal portion 11a of the liquid crystal display panel 10, in the present invention, the following configuration is adopted for the flexible substrate 200.

  Referring to FIGS. 2A and 2B, the flexible substrate 200 is formed on one surface of the base film 210 as a basic configuration, for example, a base film 210 made of a polyimide resin film and having flexibility. A wiring layer 220 including a large number of lead wires 221, a signal output electrode portion 230 disposed on one end side of the wiring layer 220, and an electrically insulating cover layer 240 formed on the wiring layer 220. ing.

  The signal output electrode portion 230 includes an end portion of each lead wire 221 as a lead electrode 221a. Heat seal bonding means 30 is provided on the signal output electrode section 230, and the signal output electrode section 230 is electrically connected to the signal input electrode section 11 c provided on the panel side terminal section 11 a via the heat seal bonding means 30. , Mechanically connected.

  For the heat seal bonding means 30, for example, an anisotropic conductive film (ACF) or a paste containing fine silver particles in a thermoplastic resin may be used.

  In the conventional flexible substrate, as described with reference to FIG. 3, the signal output electrode portion is provided on the one end 20a side of the flexible substrate 20 and terminates there. However, in the flexible substrate 200 of the present invention, the signal output electrode portion is provided. 230 is provided with a flap piece 211 that is formed by further pulling out only the base film 210 by a predetermined length in the depth direction of the terminal portion 11a.

  The depth direction of the terminal portion 11a is a direction from the end edge 11b of the terminal portion 11a toward the peripheral sealing material 13.

  In the present invention, a protective resin 40 layer for protection is formed on one surface of the flap piece 211 facing the terminal portion 11a, preferably in the entire width direction. This protective resin 40 is for covering the lead electrode exposed to the terminal portion 11a of the signal input electrode portion 11c and protecting it from foreign matter, as in the conventional example.

  The protective resin 40 is a thermoplastic synthetic resin, in particular, a thermoplastic synthetic resin (such as a hot melt resin) that is the same as or similar to the thermoplastic synthetic resin contained in the heat seal bonding means 30, and formed in the same process. It is preferable in that it can be heated and melted under the same conditions. Further, as shown in FIG. 2 (a), the protective resin 40 has a coating thickness that gradually increases from the lead base side (signal output electrode 230 side) of the flap piece 211 toward the tip side. It is preferable to apply to the flap piece 211.

  To connect the flexible substrate 200 to the terminal portion 11a, as shown in FIG. 1B, the signal output electrode portion 230 and the signal input electrode portion 11c are positioned and overlapped, and a flap piece with a protective resin 40 is provided. 211 is arranged on the terminal portion 11a.

  Next, as shown in FIG. 1C, a heater bar (not shown) is pressed against the portion from the heat seal bonding means 30 to the tip of the flap piece 211, so that the flap piece 211 is pressure-bonded so as to be substantially flat.

  As a result, the signal output electrode portion 230 and the signal input electrode portion 11c are electrically and mechanically connected, and the protective resin 40 is melted and protrudes from the flap piece 211, except for the current-carrying portion by the heat seal bonding means 30. The portion is covered with a protective resin 40.

  Thus, according to the present invention, electrical and mechanical connection by the heat seal bonding means 30 and application of the protective resin 40 can be performed in one step. Further, according to the present invention, after the flexible substrate 200 is connected to the terminal portion 11a, the heat seal bonding means 30 is not exposed to the outside air by the flap piece 211 and the protective resin 40. Can also be enhanced.

  In addition, by gradually increasing the thickness of the protective resin 40 from the leading base side to the leading end side of the flap piece 211, the protective resin 40 is prevented from flowing to the energizing portion side, and the protective resin 40 Since it becomes easy to be pushed out from the front end side of the flap piece 211, the protective resin 40 is also filled in a gap existing in a bowl shape below the end edge 12 a of the electrode substrate 12.

  In the case of a COG (Chip On Glass) model in which the liquid crystal driving chip component is mounted on the terminal portion 11a, an opening for fitting the chip component may be provided in the flap piece 211.

(A)-(c) Typical sectional drawing for demonstrating the manufacturing method of the electro-optical display apparatus of this invention to process order. (A) is sectional drawing which shows the printed circuit board of this invention, (b) is the bottom view. Schematic sectional view showing a conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Liquid crystal display panel 11,12 Electrode board | substrate 11a Terminal part 11c Signal input electrode part 13 Peripheral sealing material 14 Liquid crystal substance 30 Heat seal adhesion means 40 Protection resin 200 Flexible board 210 Base film 211 Flap piece 220 Wiring layer 230 Signal output electrode part 240 Cover layer

Claims (6)

A display panel having a terminal portion on which a signal input electrode portion for display driving is formed; a flexible substrate having a signal output electrode portion corresponding to the signal input electrode portion formed on one end of one surface of the base film; One end side of the flexible substrate is overlaid on the terminal portion, and the signal input electrode portion and the signal output electrode portion are electrically and mechanically connected through a heat seal connecting means, and other than the connecting portion. In the method of manufacturing an electro-optical display device in which the terminal portion is covered with a protective resin,
A flap piece formed by pulling out only the base film from the signal output electrode portion by a predetermined length in the depth direction of the terminal portion is connected to one end side of the flexible substrate, and the flap piece is on the signal output electrode portion side. Forming the protective resin layer on the surface, heating and pressurizing the flap piece together with the heat seal connecting means, causing the protective resin to protrude from the flap piece, and the terminals other than the connection portion by the heat seal connecting means A method of manufacturing an electro-optical display device, wherein the part is coated with a protective resin.   2. The method of manufacturing an electro-optical display device according to claim 1, wherein an electrically insulating thermoplastic resin is used as the protective resin.   3. The method of manufacturing an electro-optical display device according to claim 2, wherein the protective resin is the same or the same type of thermoplastic resin as the thermoplastic resin contained in the heat seal connecting means.   4. The electro-optical display device according to claim 1, wherein a thickness of the protective resin is gradually increased from a leading base side to a tip side of the flap piece. 5. Production method. A signal output electrode portion is provided on one end side of one surface of the base film, and the signal output electrode portion is electrically and mechanically connected to the signal input electrode portion formed on the terminal portion of the display panel via heat seal connection means. In the flexible substrate connected to
A flap piece is formed by drawing out only the base film from the signal output electrode portion by a predetermined length in the depth direction of the terminal portion, and the surface of the flap piece on the signal output electrode portion side is protected for the terminal portion. A flexible substrate, wherein a resin layer is formed.   6. The flexible substrate according to claim 5, wherein the thickness of the protective resin is gradually increased from the draw base side to the tip side of the flap piece.

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