JP2008233457A - Liquid crystal display and inspection method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display in which a continuity test between a conductive layer and a housing can be easily performed, even when it is difficult to bring a lead of a tester for continuity test into contact with the conductive layer grounded to the housing. <P>SOLUTION: The liquid crystal display is provided with a liquid crystal panel 1 on which a conductive film 18 is arranged; a conductive housing 3; first and second connecting parts 31, 32 of a conductor for electrically connecting the conductive film 18 to the housing 3 by contacting with both of the conductive film 18 and the housing 3; and an aperture 3h. Since an inspection member 41a is inserted from the aperture 3h into the device, contact between the second connecting part 32 and the housing 3 can be prevented, electrical connection between the second connecting part 32 and the housing 3 is released, and the second connecting part 32 is electrically connected to the inspection member 41a. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a liquid crystal display device having a connection portion for short-circuiting a conductive film of a liquid crystal panel to a housing and a test method thereof.

Conventionally, as a display device, a liquid crystal display device that performs display by utilizing a change in optical properties of liquid crystal is known. Conventional liquid crystal display devices include a vertical electric field type liquid crystal display device and a horizontal electric field type liquid crystal display device.

Further, the conventional liquid crystal display device generally includes a liquid crystal display panel having a structure in which a TFT substrate and a CF substrate are arranged to face each other with a liquid crystal layer interposed therebetween. The TFT substrate is a substrate in which a thin film transistor (TFT) is formed on the surface facing the CF substrate, and the CF substrate is a substrate in which a color filter (CF) is formed on the surface facing the TFT substrate. It is. In the conventional vertical electric field type liquid crystal display device, electrodes are formed on the mutually opposing surfaces of the TFT substrate and the CF substrate, and the liquid crystal in the liquid crystal layer is generated by the vertical electric field generated by the electrodes. The orientation direction of the molecule is controlled. Further, in the conventional liquid crystal display device of the lateral electric field type, an electrode is formed only on the surface of the TFT substrate facing the CF substrate, and the liquid crystal molecules in the liquid crystal layer are generated by the lateral electric field generated by the electrode. The orientation direction is controlled.
As described above, in the conventional liquid crystal display device, various characters and images are displayed by changing the light transmittance by controlling the alignment direction of the liquid crystal molecules in the liquid crystal layer.

In the above-described conventional lateral electric field type liquid crystal display device, an unintended electric field may be applied to the liquid crystal layer due to the generation of static electricity on the CF substrate side on which no electrode is formed. There is an inconvenience. For this reason, in a conventional lateral electric field type liquid crystal display device, countermeasures against static electricity are taken on the CF substrate side on which no electrode is formed (see, for example, Patent Document 1).

In the above-mentioned Patent Document 1, a transparent conductive film is disposed on the surface of the CF substrate opposite to the TFT substrate, and the transparent conductive film is electrically connected by a conductive spacer to a housing that houses the liquid crystal display panel. A horizontal electric field type liquid crystal display device is disclosed. Patent Document 1 configured as described above
Then, since accumulation of electric charges on the CF substrate side where no electrode is formed is suppressed, it is possible to suppress the occurrence of problems due to static electricity.
JP 2001-147441 A JP 2003-279937 A

However, even if it is attempted to conduct a continuity test with a tester as to whether or not the electrical connection between the transparent conductive film of the liquid crystal panel and the housing is reliably performed, as shown in FIG. Since the polarizing plate is disposed on the film, the tester leads cannot be brought into contact with the transparent conductive film.

If a conductive film is formed on the surface of the polarizing plate that is exposed, it will be a countermeasure against static electricity. The polarizing plate is subjected to a surface treatment such as a problem that the thickness of the polarizing plate is reduced (see Patent Document 2), the thickness of the polarizing plate is increased by the amount of the conductive film, and an anti-reflection treatment that reduces the reflectance. There is a problem that can not be. For this reason, a conductive film is not formed on the surface of the polarizing plate that is normally exposed.

Further, such a problem is not limited to the lateral electric field method, but occurs in a liquid crystal display device in which it is difficult to bring the lead of a continuity test tester into contact with a grounded conductive layer. For example, in Patent Document 2, in order to increase the strength of a portion touched by a finger, the antistatic conductive layer of the touch panel is covered with a protective sheet.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a liquid crystal display device in which a conduction test between a conductive layer and a housing is easy. It is another object of the present invention to provide a test method that facilitates a continuity test between a conductive layer and a casing.

In order to solve the above problems, a liquid crystal display device according to the present invention includes a liquid crystal panel provided with a conductive film, a conductive casing, and the conductive film by contacting both the conductive film and the casing. And a first connecting portion of a conductor that electrically connects the casing, a second connecting portion of a conductor that is electrically connected to the conductive film, and an opening, and an inspection member from the opening into the apparatus Is inserted, the second connection portion and the inspection member are electrically connected.

Thus, since the connection part which conducts with the conductive film and the opening for connecting the inspection member (tester lead) to this are provided, when conducting the conduction test between the conductive film and the casing, the conductive film is inside the apparatus. Even if they are disposed in the test leads, the tester leads can be easily electrically connected to the conductive film.

In addition, a liquid crystal panel in which a conductive film is disposed, a conductive casing, and a conductor that electrically connects the conductive film and the casing by contacting both the conductive film and the casing. 1. A second connection portion and an opening are provided, and an inspection member is inserted into the apparatus through the opening to prevent contact between the second connection portion and the housing, thereby preventing the second connection portion and the housing from being contacted. The electrical connection of the body is released and the second connection portion and the inspection member are electrically connected.

As described above, since the second connection portion for the continuity test also electrically connects the conductive film and the housing, the reliability of the ground of the conductive film is increased. Further, the second connection part can be used in common with the first connection part.

Further, the opening is closed by the second connection portion. Thereby, the invasion of foreign matter from the opening can be prevented.

Further, the second connecting portion presses and contacts the casing by elasticity, and the inspection member presses the second connecting portion against the pressing of the second connecting portion by an insertion force into the apparatus. This prevents contact between the second connecting portion and the housing.

Thus, in order to make an electrical connection using elasticity, the electrical connection between the second connection part and the housing and the reliability of the electrical connection between the second connection part and the inspection member are ensured. improves.

The inspection member is inserted in a direction opposite to the pressing direction of the second connection portion. Thereby, by only inserting the inspection member in one direction, the connection between the second connection portion and the housing can be opened and the inspection member can be connected to the second connection portion.

Further, the inspection member is inserted between the second connection portion and the housing, thereby the second member.
Contact between the connecting portion and the housing is prevented.

As a result, it is possible to open the connection between the second connection portion and the housing and to connect the inspection member to the second connection portion.

In addition to the opening, the first connection portion and the housing are prevented from coming into contact with each other by being inserted into the apparatus, thereby opening the electrical connection between the first connection portion and the housing and the first connection. A preliminary opening into which the inspection member electrically connected to the unit is inserted.

As a result, it is possible to identify two defective connections (between the first connection portion and the housing or between the second connection portion and the housing) by performing two inspections.

In order to solve the above problems, a liquid crystal display inspection method according to the present invention includes a liquid crystal panel having a conductive film disposed on a surface thereof, a conductive casing, and both the conductive film and the casing. The method for inspecting a short circuit of a liquid crystal display device that short-circuits the conductive film and the housing by including a first connection part that comes into contact with the liquid crystal display device,
The liquid crystal display device includes a second connection portion that short-circuits the conductive film and the casing by contacting both the conductive film and the casing, and the casing includes an opening, and the opening is provided in the apparatus. Inspection to prevent contact between the second connecting portion and the housing by being inserted to open an electrical connection between the second connecting portion and the housing and to be electrically connected to the second connecting portion. Comprising a member,
The inspection member is inserted from the opening to open the electrical connection between the second connection portion and the housing and to be electrically connected to the second connection portion, and to electrically connect the inspection member and the housing. The correct connection.

Thus, since the connection part which conducts with the conductive film and the opening for connecting the inspection member (tester lead) to this are provided, when conducting the conduction test between the conductive film and the casing, the conductive film is inside the apparatus. Even if they are disposed in the test leads, the tester leads can be easily electrically connected to the conductive film.

The housing includes a preliminary opening, and the inspection member is inserted into the apparatus through the preliminary opening, thereby preventing the first connection portion and the housing from contacting each other. Opening the electrical connection of the body and being electrically connected to the first connection part;
The inspection member is inserted from the preliminary opening to release the electrical connection between the first connection portion and the housing and to be electrically connected to the first connection portion, and between the inspection member and the housing. Check the electrical connection.

As a result, it is possible to identify two defective connections (between the first connection portion and the housing or between the second connection portion and the housing) by performing two inspections.

Hereinafter, the best embodiment of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a liquid crystal display device for embodying the technical idea of the present invention, and is not intended to identify the present invention as this liquid crystal module, and claims Other embodiments that fall within the scope are equally applicable.
(First embodiment)
FIG. 1 is a schematic diagram of a head-up display including the liquid crystal display device 100 according to the first embodiment. As shown in FIG. 1, the liquid crystal display device 100 according to the first embodiment is mounted on a predetermined device so that display light L <b> 1 can be projected onto a display object 101 (for example, a windshield of an automobile). ing. Specifically, the liquid crystal display device 100 is disposed between the backlight 102 and the concave mirror 103. The display light L <b> 1 emitted from the liquid crystal display device 100 is generated when the light L <b> 2 from the backlight 102 enters the liquid crystal display device 100. Further, the display light L <b> 1 emitted from the liquid crystal display device 100 is reflected by the concave mirror 103 toward the display object 101 and projected onto the display object 101. still,
The liquid crystal display device 100, the backlight 102, and the concave mirror 103 described above are housed in a case 104 having a window portion 104a for transmitting the display light L1.

FIG. 2 is a perspective view of the liquid crystal display device 100 as viewed from the front side. FIG. 3 is an exploded perspective view of the liquid crystal display device 100 according to the first embodiment shown in FIG. FIG. 4 is a cross-sectional view of the liquid crystal display panel of the liquid crystal display device 100 according to the first embodiment shown in FIG. 5 is shown in FIG.
FIG. 6 is an exploded perspective view of the front case of the liquid crystal display device 100 according to the first embodiment shown in FIG. 6, and FIG. 6 is a plan view of the front case of the liquid crystal display device 100 according to the first embodiment shown in FIG. . FIG. 7 is a perspective view of the first and second connecting portions held in the front case of the liquid crystal display device 100 according to the first embodiment shown in FIG. FIGS. 8-11 is a figure for demonstrating the detailed structure of the front side case of the liquid crystal display device 100 by 1st Embodiment shown in FIG. FIG.
Are leads for inspecting the liquid crystal display device 100.

First, the structure of the liquid crystal display device 100 according to the first embodiment will be described with reference to FIGS. As shown in FIGS. 2 and 3, the liquid crystal display device 100 according to the first embodiment is
A horizontal electric field type liquid crystal display panel 1, a front side case 2 provided on the front side of the liquid crystal display panel 1, and a rear side case 3 provided on the rear side of the liquid crystal display panel 1 are provided. The front side case 2 is made of resin so that the projection onto the display object 101 is difficult to be visually recognized,
It is comprised so that reflection of light can be suppressed. Specifically, the color of the front side case 2 is made black, or the surface of the front side case 2 is given fine irregularities so as to diffusely reflect light. The rear case 3 is configured by bending a metal plate. Although not shown, the metal rear case 3 is connected to the ground potential. The liquid crystal display panel 1 is stored in a box-shaped storage case configured by combining the front side case 2 and the rear side case 3. The liquid crystal display panel 1 is an example of the “display panel” in the present invention. The front side case 2 is an example of the “resin case” in the present invention, and the rear side case 3 is an example of the “metal case” in the present invention.

When the liquid crystal display panel 1 is stored in the storage case, the liquid crystal display panel 1
The non-display area 1 b other than the display area 1 a is covered with the front case 2, and the liquid crystal display panel 1 is placed on the rear case 3. Further, in a state where the liquid crystal display panel 1 is stored inside the storage case, the side portion 2a of the front side case 2 so as to surround the liquid crystal display panel 1.
2b, 2c and 2d are arranged, and side portions 3a, 3b, 3c and 3d of the rear case 3 are arranged along the outer surfaces of the side portions 2a to 2d of the front case 2. The side portions 2a to 2d are examples of the “first side portion” of the present invention, and the side portions 3a to 3d are examples of the “second side portion” of the present invention.

As shown in FIG. 4, the liquid crystal display panel 1 has a structure in which a liquid crystal layer 13 is sandwiched between a TFT substrate 11 located on the rear side and a CF substrate 12 located on the front side. T
A thin film transistor (TFT) (not shown) is formed on the surface of the FT substrate 11 facing the CF substrate 12.
On the surface of the CF substrate 12 facing the TFT substrate 11,
A color filter (CF) 12a is formed. Also, the CF substrate 12 of the TFT substrate 11
A pixel electrode 14 and a common electrode 15 for generating a lateral electric field are formed in the liquid crystal layer 13 on the surface opposite to. The alignment direction of the liquid crystal molecules in the liquid crystal layer 13 is controlled by a lateral electric field generated between the pixel electrode 14 and the common electrode 15.

A liquid crystal display panel controlled by a lateral electric field has a structure in which a first electrode and a second electrode are formed on the liquid crystal layer side of one of a pair of substrates sandwiching a liquid crystal layer. The first
The liquid crystal layer is driven by an electric field generated between the electrode and the second electrode. Therefore,
The first electrode is formed on the liquid crystal layer side of one of the pair of substrates sandwiching the liquid crystal layer, and the second electrode is formed on the first electrode via an insulating film, A so-called fringe field switching mode liquid crystal display panel for driving a liquid crystal layer by an electric field generated between the first electrode and the second electrode is also controlled by the lateral electric field described above. include.

A rear polarizing plate 16 is provided on the surface of the TFT substrate 11 opposite to the CF substrate 12, and the front side of the surface of the CF substrate 12 opposite to the TFT substrate 11 is provided. A polarizing plate 17 is provided. The rear-side polarizing plate 16 and the front-side polarizing plate 17 are arranged so that their transmission axis directions are shifted from each other by about 90 °.

Moreover, the liquid crystal display panel 1 further includes an ITO film 18 for preventing static electricity disposed on the front side. Specifically, the ITO film 18 of the liquid crystal display panel 1 is disposed on the surface of the CF substrate 12 on the front side polarizing plate 17 side. The ITO film 18 is electrically connected to the rear case 3 through first and second connection portions 31 and 32 described later (see FIG. 8). For this reason, the first
In the embodiment, since the accumulation of electric charges on the front side of the liquid crystal display panel 1 is suppressed, it is possible to suppress the occurrence of problems due to static electricity. The ITO film 18 is an example of the “transparent conductive film” in the present invention. Here, in the first embodiment, a transparent conductive film other than the ITO film 18 may be used. For example, a conductive material may be mixed in an adhesive used when the front-side polarizing plate 17 is attached, and the adhesive mixed with the conductive material may be used as the transparent conductive film.
Alternatively, the front side polarizing plate 17 may be made of a conductive material, and the conductive front side polarizing plate 17 may be a transparent conductive film.

Further, as shown in FIG. 3, an FPC (flexible printed wiring board) 19 is connected to the liquid crystal display panel 1 (TFT substrate 11). The external connection terminal 19a (
1) is connected to an electronic device (not shown) on the automobile side.

As shown in FIG. 5, the front case 2 of the first embodiment includes a case member 21 having a covering portion 21 a that covers a non-display area 1 b (see FIG. 3) of the liquid crystal display panel 1, and the liquid crystal display panel 1. It is divided | segmented into the case member 22 which has the support part 22a which supports the side end surface. The case members 21 and 22 are examples of the “second case member” and the “first case member” in the present invention, respectively.

Further, as shown in FIGS. 5 and 6, two engaging pieces 21 b projecting outward are formed at portions corresponding to the side portions 2 a and 2 b of the case member 21.
Further, each of the portions corresponding to the side portions 2a and 2b of the case member 22 is formed with one engaging piece 22b protruding outward, and corresponds to the side portion 2c of the case member 22. Two engaging pieces 22b projecting outward are formed in the portion. Also,
As shown in FIG. 3, the side holes 3a and 3b of the rear case 3 have engagement holes 3e that engage with the engagement pieces 21b and 22b of the front case 2 (case members 21 and 22), respectively. Are formed three by three. Further, two engagement holes 3e that engage with the engagement pieces 22b of the front side case 2 (case member 22) described above are formed in the side portion 3c of the rear side case 3. And as shown in FIG. 1, the engagement piece 2 of the front side case 2 (case members 21 and 22).
The front case 2 is fixed to the rear case 3 by engaging the engaging holes 3e of the rear case 3 with 1b and 22b. Further, the front case 2 is fixed to the rear case 3, whereby the storage case constituted by the front case 2 and the rear case 3 is held in a box shape.

Further, as shown in FIG. 5, the portion corresponding to the side portion 2d of the case member 22 has a front-rear direction (
A groove 22c is formed so as to be recessed in the (A direction). As shown in FIGS. 1 and 3, the open end of the groove portion 22c of the case member 22 is a portion 21c (hereinafter referred to as the side portion 2d side) of the covering portion 21a of the case member 21 by combining the case members 21 and 22. , Blocking part 2
1c). For this reason, by combining the case members 21 and 22, an opening 2 e constituted by the closing portion 21 c of the case member 21 and the groove portion 22 c of the case member 22 is formed in the side portion 2 d of the front side case 2. Become. An opening (notch) 3f is formed in the side 3d of the rear case 3 (the portion corresponding to the opening 2e of the front case 2). In the state where the liquid crystal display panel 1 is housed in the housing case constituted by the front side case 2 and the rear side case 3, the liquid crystal display panel 1
The external connection terminal 19a of the FPC 19 connected to the front side case 2 and the rear side case 3
Are pulled out from the respective openings 2e and 3f.

Here, in 1st Embodiment, as shown in FIG. 5, the 1st, 2nd connection parts 31 and 32 used for the above-mentioned countermeasure against static electricity are hold | maintained at the side part 2c of the front side case 2. As shown in FIG. 1st connection part 3
1 and the 2nd connection part 32 are the same material and the same shape. The first and second connecting portions 31 and 32 are
As shown in FIG. 7 and FIG. 8, it is constituted by a stainless steel leaf spring having a thickness of about 0.1 mm, and the two spring portions 31a, 32a and 31b, 32b are L-shaped connecting portions 31c, It has the shape connected integrally through 32c. The spring portions 31 a and 32 a of the first and second connection portions 31 and 32 are disposed inside the side portion 2 c of the front side case 2, and the spring portions of the first and second connection portions 31 and 32. 31b and 32b are arrange | positioned on the outer side of the side part 2c of the front side case 2. As shown in FIG. Further, the spring portions 31a and 32a of the first and second connection portions 31 and 32 are bent so that an urging force is generated in the front-rear direction (A direction). The spring portions 31b and 32b of the first and second connection portions 31 and 32 are in the thickness direction of the side portions 2c and 3c (
It is folded in a U shape so that a biasing force is generated in the (B direction). In the first embodiment, the U-shaped spring portions 31b and 32b of the first and second connection portions 31 and 32 are arranged so that their open ends do not face the A direction.

The spring portions 31a and 32a of the first and second connection portions 31 and 32 have contact portions 31d and 32d that are in contact with the front surface of the ITO film 18 included in the liquid crystal display panel 1. 1
The second connection parts 31 and 32 are electrically connected to the ITO film 18 by the contact parts 31d and 32d coming into contact with the front surface of the ITO film 18. The tips of the spring portions 31 a and 32 a of the first and second connection portions 31 are bent so as not to contact the front surface of the ITO film 18. Furthermore, the spring portions 31b and 32b of the first and second connection portions 31 and 32 have contact portions 31e and 32e that come into contact with the inner surface of the side portion 3c of the rear surface side case 3, respectively. The connecting portions 31 and 32 are electrically connected to the rear case 3 when the contact portions 31 e and 32 e come into contact with the inner surface of the side portion 3 c of the rear case 3. The contact portion 31d,
32d, 31e, and 32e are examples of the “first contact portion” and the “second contact portion” in the present invention, respectively.

Moreover, in 1st Embodiment, the part by which the 1st, 2nd connection parts 31 and 32 of the side part 2c of the front side case 2 are hold | maintained has the following structures. That is, in the first embodiment, FIG.
As shown in FIG. 10, a groove portion 22d is formed in a portion corresponding to the side portion 2c of the case member 22 which is a constituent member of the front side case 2 so as to be recessed in the A direction. As shown in FIG. 10, the open end of the groove portion 22d of the case member 22 is a portion 21d (hereinafter referred to as a closed portion) on the side portion 2c side of the covering portion 21a of the case member 21 when the case members 21 and 22 are combined. 21d). For this reason, in the first embodiment, by combining the case members 21 and 22, the opening 2 f constituted by the closing portion 21 d of the case member 21 and the groove portion 22 d of the case member 22 is changed to the side portion 2 c of the front side case 2. Will be formed.

In the first embodiment, the case members 21 and 22 are combined in a state where the coupling portions 31c and 32c of the first and second connection portions 31 and 32 are fitted in the groove portions 22d of the case member 22, thereby the front side. The first and second connection portions 31 and 32 are held on the side portion 2 c of the case 2. That is, in the first embodiment, the spring portions 31b, 3 of the first and second connection portions 31, 32 are used.
2b (contact portions 31e, 32e) is in a state of being drawn out of the side portion 2c of the front side case 2 from the opening 2f formed in the side portion 2c of the front side case 2.

Further, in a state where the first and second connection portions 31 and 32 are held on the side portion 2 c of the front side case 2, the connection portions 31 c and 32 c of the first and second connection portions 31 and 32 are connected to the case member 21. Blocking part 21
It is pressed toward the rear side by d. Thereby, the urging | biasing force of A direction has generate | occur | produced in the spring parts 31a and 32a (contact part 31d, 32d) of the 1st, 2nd connection parts 31 and 32. FIG. Therefore, in a state where the first and second connection portions 31 and 32 are held on the side portion 2c of the front side case 2, the liquid crystal display panel 1 is contacted by the contact portions 31d and 32d of the first and second connection portions 31 and 32. The surface on the front side of the ITO film 18 contained in is energized.

Further, as shown in FIGS. 8 to 10, B of the portion 22 e around the groove portion 22 d of the case member 22.
The thickness in the direction is determined by the spring portions 31b and 32b (contact portions 31e and 3b) of the first and second connection portions 31 and 32.
2e) is set so as to be smaller than the thickness of the other portion 22f in the B direction in order to secure a space for disposing. That is, the first and second sides 2c of the front case 2
In the state where the connection portions 31 and 32 are held, the spring portions 31b of the first and second connection portions 31 and 32,
32 b (contact portions 31 e and 32 e) is sandwiched between the outer surface of the portion 22 e of the case member 22 and the inner surface of the side portion 3 c of the rear case 3. Accordingly, the first and second connection portions 31
, 32 spring portions 31b, 32b (contact portions 31e, 32e) generate a biasing force in the B direction. For this reason, when the first and second connection portions 31 and 32 are held on the side portion 2c of the front side case 2, the rear side case 3 is formed by the contact portions 31e and 32e of the first and second connection portions 31 and 32. The inner side surface of the side portion 3c is biased.

Further, as shown in FIGS. 9 and 11, the bent portions of the spring portions 31 b and 32 b of the first and second connection portions 31 and 32 are formed on the outer surface of the portion corresponding to the side portion 2 c of the case member 22. 3
A groove 22g into which 1f and 32f are inserted is formed. The groove 22 of the case member 22
The width of d in the C direction (see FIG. 9) is set to be larger than the width of the coupling portions 31c and 32c of the first and second connection portions 31 and 32 in the C direction. Accordingly, the first and second connection portions 31 and 32 are slid in the C direction after the coupling portions 31c and 32c of the first and second connection portions 31 and 32 are fitted in the groove portion 22d of the case member 22, thereby the first 1, 2nd connection part 31, 3
The two bent portions 31 f and 32 f can be inserted into the groove portion 22 g of the case member 22.

In the first embodiment, as described above, the first and second connection portions 31 and 32 electrically connected to the ITO film 18 of the liquid crystal display panel 1 are connected to the side portion 2c of the resin front side case 2. By forming an opening 2f for pulling out a part (contact portions 31e, 32e) to the outside of the front side case 2, a part (contact portions 31e, 32e) of the first and second connection portions 31, 32 is formed. Front case 2
Since it can be pulled out from the opening 2f to the outside of the front case 2, electrical connection between the metal rear case 3 and the first and second connecting portions 31 and 32 can be easily performed. That is, the electrical connection between the ITO film 18 and the rear case 3 by the first and second connection portions 31 and 32 can be easily performed. As a result, it is possible to easily take measures against static electricity on the front side of the liquid crystal display panel 1.

In the first embodiment, as described above, the opening 2f is formed in the side portion 2c of the front side case 2 to thereby form the rear side case along the outer side surfaces of the side portions 2a to 2d of the front side case 2. 3
Since the side portions 3a to 3d are arranged, a part of the first and second connection portions 31 and 32 (contact portion 3
1e, 32e) from the opening 2f formed in the side 2c of the front case 2 to the front case 2
The first and second connection portions 31 can be drawn out without performing complicated routing.
A part (contact portions 31e, 32e) of 32 can be electrically connected to the inner surface of the side portion 3c of the rear case 3.

In the first embodiment, as described above, the contact portions 31d and 32 of the first and second connection portions 31 are provided.
The front surface side of the ITO film 18 included in the liquid crystal display panel 1 is urged by d, so that the contact portions 31d and 32d of the first and second connection portions 31 are on the front surface side of the ITO film 18. Therefore, the electrical connection between the ITO film 18 and the first and second connection portions 31 can be reliably performed. In this case, the first and second connection portions 31 and 3
2 is constituted by a metal leaf spring, whereby the first and second connecting portions 31 as described above,
32 can be easily obtained.

In the first embodiment, as described above, the contact portions 31e of the first and second connection portions 31 and 32 are provided.
, 32e is configured so that the inner surface of the side portion 3c of the rear surface side case 3 is urged so that the contact portions 31e, 32e of the first and second connection portions 31, 32 are side portions of the rear surface side case 3. 3c
Since it can suppress that it leaves | separates from the inner surface of this, electrical connection with the rear surface side case 3 and the 1st, 2nd connection parts 31 and 32 can be performed reliably. In this case, the first and second connecting portions 3
By configuring 1 and 32 with metal leaf springs, the first and second connection portions 31 and 32 as described above can be easily obtained.

In the first embodiment, as described above, the front side case 2 is divided into the two case members 21 and 22, and the opening 2 f formed in the side portion 2 c of the front side case 2 is replaced with the case member 21.
The first and second connecting portions 31 and 32 are fitted into the groove portion 22d of the case member 22 and the case member 21 and the groove portion 22d provided in the case member 22. 22 is easily combined with the first and second connection portions 31.
, 32 (contact portions 31e, 32e) can be drawn out from the opening 2f of the front case 2 to the outside of the front case 2.

Next, a test method for confirming electrical connection by the first and second connection portions 31 and 32 will be described. 12 is a perspective view showing the first lead 41 of the tester 40 inserted into the liquid crystal display device 100 for conducting the continuity test, and FIG. 13 is a plan view showing a state in which the first lead 41 is inserted in FIG. 14 is a cross-sectional view showing a state where the first lead 41 is inserted in FIG. 10, FIG. 15 is a view showing a connection state before the first lead 41 is inserted, and FIG. 1 is a diagram showing an electrical connection state when one lead 41 is inserted into the second connection portion 32 side.
7 is a diagram showing an electrical connection state when the first lead 41 is inserted into the first connection portion 31 side.

As shown in FIGS. 3 and 10, first and second openings 3 g and 3 h are provided in the side portion 3 c of the rear case 3 where the contact portions 31 e and 32 e of the first and second connection portions 31 and 32 are in contact with each other. The first and second openings 3g and 3h of the rear case 3 are arranged at positions and sizes so as to be blocked by the contact portions 31e and 32e of the first and second connection portions 31 and 32. Accordingly, the first and second connection portions 31 and 32 prevent foreign matters from entering the apparatus through the first and second openings 3g and 3h.

Tester 40 for conducting a continuity test from the first and second openings 3g and 3h (see FIGS. 15 and 16)
The first terminal 41a of the first lead 41 is inserted. As shown in FIG. 12, the first terminal 41a includes an insulating material grip 41b and a conductive material contact 41c protruding from the tip of the grip 41b. As shown in FIGS. 13 and 14, when the first terminal 41a is inserted from the preliminary opening 3g or the opening 3h, the contact portion 41c of the first terminal 41a moves in the B direction of the first connection portion 31 or the second connection portion 32. The contact portion 31e of the first connection portion 31 or the contact portion 32 of the second connection portion 32 against the urging force.
e is pressed, and the connection between the first connection part 31 or the second connection part 32 and the side part 3c of the rear case 3 is released. At this time, the contact portion 41c of the first terminal 41a is electrically connected to the first connection portion 31 or the second connection portion 32, but is blocked by the grip portion 41b of the insulating material, and the rear case 3
And are not electrically connected.

As described above, since the first lead 41 is inserted against the urging force of the electrical connection of the second connection portion 32, the electrical connection between the second connection portion 32 and the rear case 3 can be performed only by the insertion work. In addition to releasing the connection, the second connection portion 32 and the first lead 41 can be electrically connected. In addition, since the second connection portion 32 and the first lead 41 are press-contacted by the elastic reaction force of the second connection portion 32, the reliability of electrical connection is increased.

The second terminal 41d of the first lead 41 includes an insulating material grip 41e and a conductive material contact 41f protruding from the tip of the grip 41e. The contact portion 41c of the first terminal 41a and the contact portion 41f of the second terminal 41d are electrically connected, and the contact portion 41f of the second terminal 41d is the first input terminal 43 of the tester 40.
Connected. Thereby, the first connection part 31 or the second connection part 32 is electrically connected to the first input terminal 43 of the tester 40.

The second lead 42 electrically connects the rear case 3 and the second input terminal 44 of the tester 40. Then, the user checks the continuity between the first input terminal and the second input terminal with the tester 40.

As shown in FIG. 16, when the first lead 41 is inserted into the opening 3h on the second connecting portion 32 side,
If continuity is confirmed by the tester 40, the rear case 3 to the first connection part 31 to the ITO film 18 to
This means that the second connection portion 32 is conducted, and the ITO film 18 is normally grounded to the rear case 3 by the first connection portion 31. If non-conductivity is confirmed by the tester 40, three contact points (1B, 1A in FIG. 16) of the rear case 3 to the first connection part 31 to the ITO film 18 to the second connection part 32 will be described.
2A), at least one of them is non-conductive.

When the first lead 41 is inserted into the opening 3h on the second connection portion 32 side and non-conductivity is confirmed by the tester 40, the first lead 41 is inserted into the preliminary opening 3g on the first connection portion 31 side as shown in FIG. If the tester 40 confirms continuity, the rear case 3 to the first connection part 31 are non-conductive, and the non-conductive part can be specified. As described above, the openings are provided in both the first and second connection portions, and the non-conductive portion can be specified by performing the continuity test twice, and the repair becomes easy.

In the above-described embodiment, both the first connection portion 31 and the second connection portion 32 are in contact with the rear case 3. However, if the second connection portion 32 is dedicated to the test, the second connection portion 32 is Even if it is not in contact with the rear case 3, the continuity test of the rear case 3 to the first connection part 31 to the ITO film 18 to the second connection part 32 can be performed. However, if the second connection portion 32 is also brought into contact with the rear case 3, even if one of the electrical connections is defective, if the other is not defective, static electricity is prevented.
Reliability is improved.

(Second Embodiment)
Next, a second embodiment will be described. The second embodiment is different from the first embodiment in a method of opening an electrical connection between the rear case 3 and the first connection portion 31. FIG. 18 shows a tester (not shown)
FIG. 19 is a perspective view showing an insertion direction of the first lead 51 of the tester, and FIG. 20 is a perspective view showing an insertion state of the first lead 51 of the tester.

The tester according to the second embodiment is different from the first embodiment in the first lead 51. As shown in FIG. 18, the first terminal 51a of the first lead 51 of the second embodiment is an insulating material and is formed to be exposed only on one surface of the elongated rectangular parallelepiped grip 51b and the tip of the grip 51b. The conductive material contact portion 51c. The second terminal 41d is the same as in the second embodiment, the contact portion 41f of the second terminal 41d and the contact portion 51c of the first terminal 51a are electrically connected, and the contact portion 41 of the second terminal 41d.
f is connected to a first input terminal (not shown) of the tester.

As shown in FIG. 19, an opening 3i between the upper side portion 3c of the rear case 3 and one side portion 3b (
The first terminal 51a of the first lead 51 of the tester 50 is inserted from the gap). At this time, it inserts so that the exposed surface of the contact part 51c of the 1st terminal 51a may become the 1st connection part 31 side. FIG.
As indicated by 0, the first lead 51 is inserted between the first connecting portion 31 and the rear case 3 so that the electrical connection between the first connecting portion 31 and the rear case 3 is released. Then, the contact portion 51 c of the first terminal 51 a contacts the second contact portion 31 e of the first connection portion 31, and the first connection portion 31.
Are electrically connected to a first input terminal (not shown) of the tester.

Then, similarly to the first embodiment, the second input terminal (not shown) of the tester is electrically connected to the rear case 3 so that the rear case 3 to the second 2 are similar to the first embodiment. A continuity test of the connection part 31 to the ITO film 18 to the first connection part 32 can be performed.

1 is a schematic view of an apparatus including a liquid crystal display device (liquid crystal display device) 100 according to a first embodiment of the present invention. It is a perspective view at the time of seeing the liquid crystal display device (display device) by a 1st embodiment from the front side. FIG. 3 is an exploded perspective view of the liquid crystal display device according to the first embodiment shown in FIG. 2. It is sectional drawing of the liquid crystal display panel of the liquid crystal display device by 1st Embodiment shown in FIG. It is a disassembled perspective view of the front side case of the liquid crystal display device by 1st Embodiment shown in FIG. It is a top view of the front side case of the liquid crystal display device by 1st Embodiment shown in FIG. FIG. 3 is a perspective view of first and second connecting portions held in a front case of the liquid crystal display device according to the first embodiment shown in FIG. 2. It is a perspective view for demonstrating the detailed structure of the front side case of the liquid crystal display device by 1st Embodiment shown in FIG. It is a top view for demonstrating the detailed structure of the front side case of the liquid crystal display device by 1st Embodiment shown in FIG. FIG. 10 is a cross-sectional view taken along line 100-100 in FIG. 9. It is sectional drawing along the 200-200 line | wire of FIG. It is a perspective view which shows the 1st lead | read | reed of the tester by 1st Embodiment. FIG. 10 is a plan view showing a state where the first lead is inserted in FIG. 9. FIG. 11 is a cross-sectional view illustrating a state where a first lead is inserted in FIG. 10. It is a figure which shows the electrical connection state of the ITO film | membrane and back side case by 1st Embodiment. FIG. 16 is a diagram illustrating a state in which the first lead is inserted into the second connection portion side in FIG. 15. FIG. 16 is a diagram illustrating a state where the first lead is inserted into the first connection portion side in FIG. 15. It is a perspective view which shows the 1st lead | read | reed of the tester by 2nd Embodiment. It is a perspective view showing the state where the 1st lead by a 2nd embodiment is inserted. It is a perspective view showing the state where the 1st lead by a 2nd embodiment was inserted.

Explanation of symbols

1 Liquid crystal display panel (display panel)
18 ITO film (transparent conductive film)
2, 40 Front side case (resin case)
2a, 2b, 2c, 2d, 40a, 40b, 40c, 40d Side (first side)
2f, 40f Opening 3 Rear side case (metal case)
3a, 3b, 3c, 3d side (second side)
3g Preliminary opening 3h Opening 3i Opening 21, 41 Case member (second case member)
21c, 41c Closure part 22, 42 Case member (first case member)
22d, 42d Groove part 31 1st, 2nd connection part 31d Contact part (1st contact part)
31e Contact part (second contact part)
40, 51 Tester 41, 51 First lead 41a, 51a First terminal 41c, 51c Contact part

Claims (9)

A liquid crystal panel in which a conductive film is disposed, a conductive casing, and a first connection of a conductor that electrically connects the conductive film and the casing by contacting both the conductive film and the casing , A second connection portion of a conductor that is electrically connected to the conductive film, and an opening, and when the inspection member is inserted into the apparatus from the opening, the second connection portion and the inspection member are A liquid crystal display device which is electrically connected. A liquid crystal panel in which a conductive film is disposed, a conductive casing, and a first conductor that electrically connects the conductive film and the casing by contacting both the conductive film and the casing. A second connecting portion and an opening, and an inspection member is inserted into the apparatus through the opening to prevent contact between the second connecting portion and the housing; A liquid crystal display device, wherein an electrical connection is released and the second connection portion and the inspection member are electrically connected. The liquid crystal display device according to claim 2, wherein the opening is closed by the second connection portion. The second connecting portion presses and contacts the casing by elasticity, and the inspection member presses the second connecting portion against the pressing of the second connecting portion by an insertion force into the apparatus. The second
The liquid crystal display device according to claim 2, wherein contact between the connection portion and the housing is prevented. The liquid crystal display device according to claim 4, wherein the inspection member is inserted in a direction opposite to a pressing direction of the second connection portion. The liquid crystal display device according to claim 2, wherein the inspection member is inserted between the second connection portion and the housing to prevent contact between the second connection portion and the housing. In addition to the opening, the first connection portion and the housing are prevented from contacting each other by being inserted into the apparatus to open the electrical connection between the first connection portion and the housing, and the first connection portion. The liquid crystal display device according to claim 2, further comprising a preliminary opening into which the inspection member to be electrically connected is inserted. Liquid crystal that short-circuits the conductive film and the casing by including a liquid crystal panel having a conductive film disposed on the surface, a conductive casing, and a first connection portion that contacts both the conductive film and the casing. A method for inspecting a short circuit of a display device, comprising:
The liquid crystal display device includes a second connection portion that short-circuits the conductive film and the casing by contacting both the conductive film and the casing, and the casing includes an opening, and the opening is provided in the apparatus. Inspection to prevent contact between the second connecting portion and the housing by being inserted to open an electrical connection between the second connecting portion and the housing and to be electrically connected to the second connecting portion. Comprising a member,
The inspection member is inserted from the opening to open the electrical connection between the second connection portion and the housing and to be electrically connected to the second connection portion, and to electrically connect the inspection member and the housing. A test method for a liquid crystal display device characterized by confirming proper connection. The housing includes a preliminary opening, and the inspection member is inserted into the apparatus through the preliminary opening, thereby preventing contact between the first connection portion and the housing, and the first connection portion and the housing. Opening an electrical connection and being electrically connected to the first connection part;
The inspection member is inserted from the preliminary opening to release the electrical connection between the first connection portion and the housing and to be electrically connected to the first connection portion, and between the inspection member and the housing. 9. The test method for a liquid crystal display device according to claim 8, wherein electrical connection is confirmed.

Images