JP2007065487A - Antistatic device of display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antistatic device that is durable even against repeated use. <P>SOLUTION: Polarizing plates 14, 15 are stuck to the outer faces of glass substrates 11, 12 of a liquid crystal panel 10, respectively, and protective films 16, 17 to be stripped in a manufacturing process are stuck to the outer faces of the polarizing plates 14, 15, respectively. An antistatic device 30 comprises a grounded container 32 and water 33 having conductivity stored in the container 32. When an FPC (flexible printed circuit) 31 connected to the connector section 20 of a printed board 19 connected to the liquid crystal panel 10 is put into the container 32, the FPC 31 is grounded via the water 33. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an antistatic device for a display panel.

  The liquid crystal display device has a configuration in which a backlight, which is an external light source, is assembled on the back side of a liquid crystal panel. The liquid crystal panel has a configuration in which a liquid crystal is sandwiched between a pair of glass substrates and a polarizing plate is attached to each of the outer surface sides of both glass substrates. Among these, although the protective film for protecting the surface is affixed on the outer surface of a polarizing plate, this protective film is peeled in a manufacturing process so that it may mention later.

  A switching element such as a TFT, a bus line connected to the switching element, and a terminal portion arranged at the end of the bus line are formed on the inner surface side of one glass substrate of the liquid crystal panel. A driver is connected to the driver and a printed circuit board is connected to the driver, and a signal is supplied to the printed circuit board from an external circuit.

  In the manufacturing process of the liquid crystal display device described above, an operation of sandwiching a liquid crystal panel obtained by attaching a polarizing plate with a protective film on the outer surfaces of both glass substrates between a bezel and a frame formed in a frame shape together. However, prior to that, it is necessary to perform the work of peeling off the front and back protective films. When the protective film is peeled off, static electricity is generated, and there is a concern that the static electricity may adversely affect the switching elements and drivers of the liquid crystal panel.

  In order to prevent such static electricity, it is conceivable that the liquid crystal panel is grounded when the protective film is peeled off. Specifically, for example, one end of an FPC (Flexible Printed Circuit) is connected to a connector of a printed circuit board, and the other end of the FPC is connected to a connector connected to the ground.

As a technique for preventing static electricity in the process of manufacturing such a liquid crystal panel, one described in Patent Document 1 below is known.
JP-A-10-186299

  However, in order to mass-produce liquid crystal display devices, the FPC is repeatedly attached and detached, so there is a concern that the FPC and the connector may be deteriorated due to friction generated between the FPC and the connector. There were problems such as frequent need.

  The present invention has been completed based on the above circumstances, and an object thereof is to provide an antistatic device that can withstand repeated use.

  As means for achieving the above object, the invention of claim 1 is for preventing static electricity of a display panel capable of displaying an image by a signal supplied from an external circuit, and is connected to ground. And a connecting part connected to the signal input part of the display panel is placed in the container, and the liquid is passed through the liquid. It is characterized in that the connection component is configured to be grounded.

  According to a second aspect of the present invention, in the first aspect, the container includes a container main body having an opening and a lid that can close the opening, and the lid includes the connection component. It is characterized in that an insertion port into which can be inserted is formed.

  The invention of claim 3 is characterized in that, in the invention of claim 1 or 2, the liquid is constituted by water.

<Invention of Claim 1>
When a connection part connected to the signal input part of the display panel is put in a container and immersed in a liquid having conductivity, the connection part, that is, the signal input part of the display panel is grounded via the liquid. . Thereby, the static electricity prevention of a display panel can be aimed at.

  According to the present invention, since mechanical friction does not occur when the connecting part is taken in and out of the container, the deterioration of the connecting part can be reduced, and therefore, it is suitable for repeated use.

<Invention of Claim 2>
Since the opening of the container main body is closed by the lid except for the insertion port for inserting the connection component, it is possible to prevent the liquid from being scattered or evaporated.

<Invention of Claim 3>
It is suitable in terms of safety and cost.

<Embodiment>
An embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the antistatic device 30 of the liquid crystal panel 10 constituting the liquid crystal display device is shown.

  First, the structure of the liquid crystal display device will be described. The liquid crystal display device has a configuration in which a liquid crystal panel 10 for displaying an image and a backlight (not shown) that emits light from the back side of the liquid crystal panel 10 are assembled to each other. Among them, the backlight is provided with a large number of linear light sources such as cold cathode tubes arranged in a line, and converts the light from the linear light source into a surface on the surface facing the liquid crystal panel 10 side. It is set as the structure provided in the state which laminated | stacked the several optical sheet.

  In the liquid crystal panel 10, a pair of transparent glass substrates 11 and 12 opposed to each other are bonded together with a predetermined gap therebetween by a spacer, and optical characteristics change between the glass substrates 11 and 12 by applying a voltage. The liquid crystal 13 is sandwiched. Polarizing plates 14 and 15 are attached to the outer surface sides of the glass substrates 11 and 12, respectively, and protective films 16 and 17 for protecting the surfaces are attached to the outer surface sides of the polarizing plates 14 and 15, respectively. It is attached. The protective films 16 and 17 are peeled off in the manufacturing process of the liquid crystal display device.

  A switching element such as a TFT connected to a source bus line (source wiring) and a gate bus line (gate wiring) orthogonal to each other is provided on the inner surface of the glass substrate 12 on the back side of the glass substrates 11 and 12 on the front side. On the inner surface of the glass substrate 11, R, G, and B pixel electrodes are provided in a matrix. A terminal portion connected to each bus line is provided on a side end portion of the glass substrate 12 on the back side, and a thin film driver (electronic component) 18 such as SOF (System On Film) is provided in this terminal portion. One end side of each is crimped and connected via an ACF (anisotropic conductive film). A printed circuit board 19 is crimped to the other end of the SOF via an ACF. The printed circuit board 19 is provided with a connector portion 20 so that an FPC constituting an external circuit can be inserted and connected, and an electrical signal necessary for displaying an image is supplied from the external circuit. It has come to be. In FIG. 1, two printed circuit boards 19 are connected to the liquid crystal panel 10.

  The liquid crystal panel 10 is held in a state of being sandwiched between a front-side bezel and a back-side frame (both bezels not shown) both formed in a frame shape, and the bezel or frame is held against the backlight. Thus, a liquid crystal display device is configured. Therefore, in the manufacturing process of the liquid crystal display device, it is necessary to peel off the protective films 16 and 17 attached to the outer surfaces of the polarizing plates 14 and 15 before the bezel and frame are assembled.

  Then, the antistatic device 30 used at the time of the peeling operation | work of the protective films 16 and 17 is demonstrated. The antistatic device 30 is installed on a worktable 40 that can be rotated in a state where the liquid crystal panel 10 is laid down (horizontal), and is rotated together with the liquid crystal panel 10 by rotating the worktable 40. It is like that. A panel receiving portion 41 for receiving the liquid crystal panel 10 is provided on the work table 40.

  The antistatic device 30 includes an FPC 31 that can be inserted into and removed from the connector portion 20 of the printed circuit board 19, a container 32 into which the FPC 31 can be inserted and removed, and water 33 that is placed in the container 32 and has conductivity. . Among these, the container 32 is formed of a conductive material, and includes a container body 34 having a substantially box shape with an upper surface opened, and a lid 35 that can close the opening of the container body 34.

  The container body 34 is connected to the ground G via a ground wire or the like. The lid 35 is detachably attached to the container main body 34, and a pair of insertion ports 36 that allow the FPC 31 to be inserted and removed in a state where the opening is closed, An opening is formed.

  The FPC 31 has a structure in which a plurality of parallel conductive paths are sandwiched between a pair of insulating and flexible films, and portions of the conductive paths exposed to the outside at both ends of the FPC 31 are formed. The terminal portions are connectable to connectors or the like. One of the end portions of the FPC 31 is inserted into the connector portion 20 of the printed circuit board 19 so that electrical connection to the liquid crystal panel 10 is achieved, whereas the other end portion is provided. Is put in the container 32 and immersed in the water 33 inside, thereby being connected to the ground G through the water 33 having conductivity. The FPC 31 can be inserted into and removed from the connector portion 20 of the printed circuit board 19 at either end. Further, at least the terminal portion of the end portion of the FPC 31 on the side that is put in the container 32 is subjected to rust prevention treatment on the surface.

  This embodiment has the structure as described above, and the operation thereof will be described subsequently. In the manufacturing process of the liquid crystal display device, the polarizing plates 14 and 15 with the protective films 16 and 17 are respectively attached to the outer surfaces of the glass substrates 11 and 12 of the liquid crystal panel 10, and then the SOF and the printed circuit board 19 are pressure-bonded. Work to connect. Then, an operation of sandwiching the liquid crystal panel 10 between the frame and the bezel is performed. Prior to that, an operation of peeling off the protective films 16 and 17 is performed. Hereinafter, the peeling operation of the protective films 16 and 17 will be described in detail.

  When the liquid crystal panel 10 is placed on the panel receiving portion 41 on the work table 40, one end side of the FPC 31 is inserted into the connector portion 20 of the printed circuit board 19 so as to be electrically connected. Then, as shown in FIG. 2, the other end of the FPC 31 is inserted into the insertion port 36 of the lid 35 of the container 32 installed on the work table 40. As a result, the other end of the FPC 31 is immersed in the water 33 in the container 32, and its terminal portion is connected to the ground G through the water 33. The operation of connecting the FPC 31 to the printed circuit board 19 may be performed at a stage before the liquid crystal panel 10 is placed on the work table 40.

  Then, the operation | work which peels off the protective film 16 of the polarizing plate 14 affixed on the glass substrate 11 of the front side is performed. As the protective film 16 is peeled off, the glass substrate 11 is peeled off. If the static electricity charged at this time is discharged toward the terminal portion of the liquid crystal panel 10, there is a concern that a problem such as damage to a switching element connected to the terminal portion, an IC of the driver 18, or the like may occur.

  However, in this embodiment, since the FPC 31 connected to the printed circuit board 19 is connected to the ground G through the water 33 placed in the container 32, the static electricity generated by the peeling is directed to the terminal portion of the liquid crystal panel 10. Even if discharged, the static electricity can surely escape to the ground G. Thereby, it can avoid that the switching element of the liquid crystal panel 10, the driver 18, etc. are damaged by static electricity.

  After the operation of peeling off the front protective film 16 is completed, the FPC 31 is pulled out from the insertion port 36 and taken out of the container 32. Then, an operation of inverting the liquid crystal panel 10 on the work table 40 is performed. When the liquid crystal panel 10 is inverted, the other end of the FPC 31 is inserted into the insertion port 36 again, and the terminal portion is immersed in the water 33 in the container 32 as shown in FIG. In this state, the protective film 17 on the back side of the liquid crystal panel 10 is peeled off. The static electricity generated at this time is surely released to the ground G as described above.

  When the protective film 17 on the back side has been peeled off, the other end side of the FPC 31 is pulled out from the container 32 and one end side is pulled out from the connector portion 20 of the printed circuit board 19. Then, after performing the operation | work which attaches a flame | frame and a bezel with respect to the liquid crystal panel 10 of the state which peeled both the protective films 16 and 17, the processed liquid crystal panel 10 is taken out from the work table 40. Thereafter, the liquid crystal panel 10 with the protective films 16 and 17 to be processed next is placed on the work table 40, and one end side of the FPC 31 is inserted into the connector portion 20 of the printed circuit board 19. In the series of operations described above, the protective film 17 on the back side of the liquid crystal panel 10 may be peeled off first.

  As described above, according to the present embodiment, when the liquid crystal panel 10 is inverted or when the liquid crystal panel 10 to be processed is changed, the FPC 31 is taken in and out of the container 32. Since there is no mechanical friction between the two, the deterioration can be reduced even when the FPC 31 is used repeatedly. This is suitable for repeating the antistatic device 30 as the liquid crystal display device is mass-produced.

  Further, since the opening of the container main body 34 is closed by the lid 35 except for the insertion port 36 for inserting the FPC 31, the water 33 is scattered outside the container 32 when the FPC 31 is inserted and removed. In addition to prevention, evaporation of the water 33 can also be prevented. Further, since the lid 35 is detachable from the container main body 34, it is convenient when the water 33 is replenished or the water 33 is replaced.

  Further, since water 33 is used as the conductive liquid, it is preferable in terms of safety and cost.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.

  (1) In the above-described embodiment, the FPC is exemplified as the connection component, but other types of connection components such as FFC may be used.

  (2) In the above-described embodiment, the case where the FPC is reused in the manufacturing process is shown. However, the FPC mounted on the product may be used for ground connection.

  (3) In the above-described embodiment, the antistatic device used in the step of peeling the protective film of the polarizing plate is exemplified, but it may be used in other steps.

  (4) In the above-described embodiment, the antistatic device used in the manufacturing process of the liquid crystal display device is illustrated, but it may be used in the manufacturing process of other types of display devices.

  (5) In the above-described embodiment, the case where the container is composed of two parts, that is, the container main body and the lid, has been shown, but one part is also included in the present invention. Moreover, what abbreviate | omitted the cover body is also contained in this invention.

  (6) In the above-described embodiment, the case where water is used as the conductive liquid has been shown. However, any liquid other than water can be substituted if it has conductivity.

The top view of the antistatic device and liquid crystal panel which concern on one Embodiment of this invention Sectional drawing for demonstrating the operation | work which peels off the protective film of a front side Sectional drawing for demonstrating the operation | work which peels the protective film of a back side

Explanation of symbols

10 ... Liquid crystal panel (display panel)
20 ... Connector part (signal input part)
30 ... Antistatic device 31 ... FPC (connecting parts)
32 ... container 33 ... water (liquid)
34 ... Container body 35 ... Lid 36 ... Insert

Claims (3)

In order to prevent static electricity of a display panel that can display an image by a signal supplied from an external circuit,
When a connecting component connected to the signal input part of the display panel is placed in the container, the container is connected to the ground, and a conductive liquid is placed in the container. An antistatic device for a display panel, wherein the connection component is connected to ground via the ground. The container is composed of a container body having an opening and a lid capable of closing the opening, and the lid is formed with an insertion port into which the connection component can be inserted. The antistatic device for a display panel according to claim 1. 3. The static electricity prevention apparatus for a display panel according to claim 1, wherein the liquid is composed of water.

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