JP2008032878A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device wherein a thermistor arrangement process is reduced and adhesion reliability of a thermistor mounting part can be enhanced. <P>SOLUTION: The thermistor 15 is mounted in the vicinity of an electrode terminal 13a for panel connection of a flexible wiring board 10 and a film base material 11 at a portion on which the thermistor 15 is mounted is made to adhere to a liquid crystal display panel 2 by using an adhesive 17. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a display device including a flexible wiring board on which a thermistor for temperature detection is mounted, and in particular, a display capable of reducing the thermistor installation process and improving the adhesion reliability of the thermistor mounting portion. Relates to the device.

  A conventional general display device includes a display device provided with a thermistor for measuring the temperature of the display panel and adjusting the drive voltage according to the temperature of the display panel. For example, in a liquid crystal display device, liquid crystal molecules have a characteristic of being activated at a high temperature and inactivated at a low temperature.

  A liquid crystal display device including such a conventional thermistor includes a liquid crystal display panel and a flexible wiring substrate for driving the liquid crystal display panel on which the thermistor is mounted.

  In the liquid crystal display panel, a pair of transparent electrode substrates each formed with a predetermined pattern made of ITO (Indium Tin Oxide) and arranged with transparent electrodes crossing each other are arranged to face each other. In-plane spacers are dispersed in the display area, and a sealing material is disposed and bonded to the peripheral edge of the display area of the other transparent electrode substrate, and liquid crystal is injected from a liquid crystal injection port previously formed in the sealing material. It is formed by sealing.

  Further, one of the pair of transparent electrode substrates constituting the liquid crystal display panel is integrally provided with an overhanging portion that projects laterally from the other transparent electrode substrate. An electrode terminal to which the IC chip and the flexible wiring board are connected is disposed on the overhanging portion.

  The flexible wiring board is made of an insulating resin material having flexibility, and is formed in a predetermined pattern on a film base material in which extending portions extending in an L shape on the side are integrally formed. An electrode made of copper foil or the like is disposed, and a cover film is formed on the electrode except for the panel connection electrode terminal and the thermistor mounting electrode terminal formed at the tip of the extension portion. .

  A thermistor for temperature detection is mounted on the electrode terminal for mounting the thermistor on the extended portion of the flexible wiring board.

  Then, the electrode terminal of the liquid crystal display panel is connected to the IC chip and the electrode terminal for panel connection of the flexible wiring board by an adhesive, and the back surface which is a non-electrode terminal forming surface of the projecting portion of the liquid crystal display panel A liquid crystal display device is formed by sticking a thermistor mounted on the extended portion of the flexible wiring board with a double-sided adhesive tape.

  According to the conventional liquid crystal display device having the above-described configuration, the temperature of the liquid crystal display panel is detected by the thermistor attached to the liquid crystal display panel, and the driving voltage of the liquid crystal is determined according to the operating environment temperature of the liquid crystal display panel. By adjusting this, it is possible to display a good image with a high contrast ratio regardless of the ambient temperature at which the liquid crystal display device is used (see, for example, Patent Document 1).

JP 2005-215334 A

  However, in the above-described conventional liquid crystal display device, for example, the thermistor mounted on the extended portion of the flexible wiring board is attached to the back surface, which is the non-electrode terminal forming surface of the extended portion of the liquid crystal display panel, using a double-sided adhesive tape. Therefore, the process of adhering the flexible wiring board to the liquid crystal display panel and the process of adhering the thermistor are required, which complicates the work and requires a double-sided adhesive tape for adhering the thermistor. It was.

  In addition, since the thermistor is attached to the liquid crystal display panel with a double-sided adhesive tape, there is a problem in the adhesion reliability of the thermistor mounting portion.

  Accordingly, an object of the present invention is to provide a display device capable of reducing the thermistor disposition process and improving the adhesion reliability of the thermistor mounting portion.

  In order to achieve the above-described object, the display device according to the present invention is characterized in that a display panel and an electrode terminal for panel connection bonded to an electrode terminal of the display panel by an adhesive are aligned on one end side of the film substrate. A display panel driving flexible wiring board in which a thermistor is mounted in the vicinity of the panel connection electrode terminal, wherein the thermistor or the film substrate on which the thermistor is mounted is bonded to the display panel. The display panel is adhered to the display panel with the same kind of adhesive as the material.

  By adopting such a configuration, the process of adhering the flexible wiring board to the display panel and the process of adhering the thermistor mounted on the flexible wiring board can be performed in one process, and the manufacturing process Can be reduced.

  Further, by bonding the thermistor with an adhesive, it is not necessary to use a double-sided pressure-sensitive adhesive tape as in the prior art, and the manufacturing cost can be reduced.

  Another feature of the display device according to the present invention resides in that the thermistor is mounted at a position deviated from the extension in the alignment direction of the panel connection electrode terminals.

  By adopting such a configuration, mechanical interference such as contact between the crimping head and the thermistor can be prevented in the step of bonding the flexible wiring board to the display panel.

  Another feature of the display device according to the present invention is that the adhesive is an ultraviolet curable resin.

  By adopting such a configuration, the thermistor can be more firmly bonded to the overhanging portion of the display panel.

  According to the display device of the present invention, the thermistor disposition process can be reduced and the adhesion reliability of the thermistor mounting portion can be improved.

  Then, by adhering the thermistor to the display panel with an adhesive, it is not necessary to use a double-sided adhesive tape, and the manufacturing cost can be reduced.

  Hereinafter, the display device according to the present invention will be described with reference to the liquid crystal display device of the embodiment shown in the drawings.

  1 is a schematic top view showing a liquid crystal display device according to an embodiment of the present invention, FIG. 2 is a side view of FIG. 1, and FIG. 3 is another embodiment of a flexible wiring board in the liquid crystal display device according to the embodiment of the present invention. It is a top view schematic diagram shown.

  As shown in FIGS. 1 and 2, the liquid crystal display device 1 of this embodiment includes a liquid crystal display panel 2 and a flexible wiring board 10 on which a thermistor 15 is mounted.

  The liquid crystal display panel 2 is made of glass, plastic, or the like, and a pair of transparent electrode substrates 3 and 4 having transparent electrodes 5 and 6 made of ITO, which are formed in a predetermined pattern on opposite surfaces and are opposed to each other. have. The transparent electrode substrate 3 is provided with an extended portion 3a that protrudes more than the transparent electrode substrate 4. On the extended portion 3a, an IC chip 16 for driving a liquid crystal display panel and the above-mentioned Electrode terminals 7 to which the flexible wiring board 10 is bonded are formed.

  Then, a sealant 8 is disposed on the peripheral portion of the display area of one transparent electrode substrate 3, and in-plane spacers (not shown) are dispersed in the display area of the other transparent electrode substrate 4, and each of the transparent The liquid crystal display panel 2 is configured by bonding the electrode substrates 3 and 4, injecting liquid crystal 9 from a liquid crystal injection port (not shown) formed in the sealing material 8 in advance, and sealing the liquid crystal injection port. ing.

  The flexible wiring board 10 includes an electrode 12 made of a copper foil or the like formed in a predetermined pattern on a film substrate 11 made of a flexible insulating resin material such as polyimide, and the film A cover film 14 is formed on the electrode 12 excluding electrode terminals (only one is shown) 13 at both ends of the substrate 11.

  And the width | variety of the film base material 11 which comprises the flexible wiring board 10 of this embodiment is formed a little wider than the width | variety of the formation area of the electrode terminal 7 of the said liquid crystal display panel 2, The said electrode terminal 13 is The panel connection electrode terminals 13a formed on the surface 11a and formed at the same pitch as the electrode terminals 7 of the liquid crystal display panel 2 are extended in the vicinity of the sides of the panel connection electrode terminals 13a, and each through A thermistor mounting electrode terminal 13b that extends to the back surface 11b through the holes 18, 18... And is formed so as to face the non-electrode terminal formation region in the vicinity of the electrode terminal 7 of the liquid crystal display panel 2. A thermistor 15 is mounted on the thermistor mounting electrode terminal 13b. The spacing between the panel connecting electrode terminal 13a and the thermistor mounting electrode terminal 13b is such that when the thermistor 15 mounted on the thermistor mounting electrode terminal 13b is bonded to the liquid crystal display panel 2, the thermistor 15 It is assumed that a predetermined interval is provided so as not to be subjected to mechanical interference such as contact with a crimping head (not shown).

  Then, an IC chip 16 is mounted on the electrode terminal 7 of the liquid crystal display panel 2 with an anisotropic conductive film 19 as an adhesive, and the panel connection of the flexible wiring board 10 is performed with an ultraviolet curable resin 17 as an adhesive. The electrode terminal 13a for the liquid crystal display panel 2 is connected to the electrode terminal 7 for the liquid crystal display panel 2, and the thermistor 15 is disposed in the vicinity of the electrode terminal 7 of the liquid crystal display panel 2 through the film base 11 of the flexible wiring substrate 10 by the ultraviolet curable resin 17. The liquid crystal display device 1 is formed by bonding to the non-electrode terminal formation region 3b.

  According to the liquid crystal display device 1 of the present embodiment having the above-described configuration, the process of adhering the thermistor 15 to the liquid crystal display panel 2 is performed on the electrode terminals 7 of the flexible wiring board 10 on the electrode terminals 7 of the liquid crystal display panel 2. Can be performed simultaneously with the connecting step, and the step of bonding only the thermistor 15 can be eliminated.

  Further, when the thermistor 15 adheres the panel connection electrode terminal 13 a of the flexible wiring board 10 to the electrode terminal 7 of the liquid crystal display panel 2, the thermistor 15 is simultaneously non-bonded in the vicinity of the electrode terminal 7 of the liquid crystal display panel 2 by the ultraviolet curable resin 17. Since it is bonded to the electrode terminal forming region 3b and does not require a double-sided adhesive tape as in the prior art, the manufacturing cost can be reduced and the thermistor 15 can be firmly bonded to the liquid crystal display panel 2.

  In addition, this invention is not limited to embodiment mentioned above, A various change is possible as needed. For example, as shown in FIG. 3, an extension portion 11 c extending in an approximately L shape is integrally formed on the side of the film base material 11 constituting the flexible wiring board 10, and the extension portion 11 c A thermistor mounting electrode terminal 13c is formed at each end through through holes 18, 18..., And the thermistor mounting electrode terminal formed at a position off the extension in the alignment direction of the panel connection electrode terminal 13a. The thermistor 15 may be mounted on 13c, and the thermistor 15 may be adhered to the non-electrode terminal formation region 3b in the vicinity of the electrode terminal 7 of the liquid crystal display panel 2 by the ultraviolet curable resin 17.

1 is a schematic top view showing a liquid crystal display device according to an embodiment of the present invention. Side view of FIG. Schematic top view showing another embodiment of the flexible wiring board in the liquid crystal display device of the embodiment of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 2 Liquid crystal display panel 3 Transparent electrode substrate 4 Transparent electrode substrate 5 Transparent electrode 6 Transparent electrode 7 Electrode terminal 8 Sealing material 9 Liquid crystal 10 Flexible wiring substrate 11 Film base material 12 Electrode 13 Electrode terminal 13a Panel connection electrode terminal 13b Thermistor mounting electrode terminal 13c Thermistor mounting electrode terminal 14 Cover film 15 Thermistor 16 IC chip 17 UV curable resin 18 Through hole 19 Anisotropic conductive film

Claims (3)

A display panel;
A panel connection electrode terminal bonded to the electrode terminal of the display panel by an adhesive is aligned on one end side of the film base, and a thermistor is mounted in the vicinity of the panel connection electrode terminal. In a display device having a flexible wiring board,
The display device, wherein the thermistor or the film base material where the thermistor is mounted is bonded to the display panel with an adhesive of the same type as the adhesive.   2. The display device according to claim 1, wherein the thermistor is mounted on a portion that is out of the extension in the alignment direction of the panel connection electrode terminals.   The display device according to claim 1, wherein the adhesive is an ultraviolet curable resin.

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