JP2002031813A - Liquid crystal display (lcd) device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LCD device with an improved repairability corresponding to requirements such as resource saving, reusability and so on. SOLUTION: The LCD device is provided with an LCD panel terminal 4 of an LCD panel 1 and a dust proof sheet 8 placed opposite to a connection part B on the rear side of a TAB(tape automated bonding) output terminal 5 of a TAB 2 and having a dimension to close off a gap S formed between the LCD panel 1 and a circuit substrate 3. A counter edge 8a on the LCD panel 1 side of the dust proof sheet 8 is stuck to an end face 1a of the LCD panel 1 with an adhesive such as a double sided adhesive tape and its counter edge 8b on the circuit substrate 3 side is pressed to stick to an end face 3a of the circuit substrate 3 with repulsive force of the dust proof sheet 8. Consequently the gap S formed between the LCD panel 1 and the circuit substrate 3 is closed off with the dust proof sheet 8 and invasion of foreign matters made of metal and so on into the connection part B of the LCD panel terminal 4 of the LCD panel 1 and the TAB output terminal 5 of the TAB 2 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an L-shaped electrode having an electrode portion.
Liquid crystal display device including CD panel, circuit board, and TAB for connecting LCD panel and circuit board, especially LC
The present invention relates to a liquid crystal display device in which a connection portion between a D panel and a TAB is subjected to dustproofing.

[0002]

2. Description of the Related Art As shown in FIG. 4, a liquid crystal display device used as a display device of a personal computer or the like has an LCD panel 1 having an LCD panel terminal 4 as an electrode part in a peripheral portion, a circuit board 3, and an LCD panel 1 as shown in FIG. And a circuit board 3 for connecting the TAB 2. And LCD
In connecting the panel 1, the circuit board 3 and the TAB 2, the LCD panel terminal 4 of the LCD panel 1 and the TAB output terminal 5 of the TAB 2, the board terminal 9 of the circuit board 3 and the TAB 2
TAB terminals 14 are electrically connected by the anisotropic conductive material 10, respectively.

Further, a resin coat 6 is filled in a gap formed between the LCD panel 1 and the TAB 2. Also T
A driver IC 7 for driving the LCD panel 1 is mounted on AB2.

[0004]

As described above, LCDs
Since the resin coat 6 is filled in the gap formed between the panel 1 and the TAB 2, the connection portion on the front side between the LCD panel terminal 4 of the LCD panel 1 and the TAB output terminal 5 of the TAB 2 is hermetically sealed with the resin coat 6. Although no problem is caused by being covered, the LCD panel terminals 4 and T
The connection portion A (see FIG. 4) on the back side of the TAB output terminal 5 of the AB 2 has a structure that is exposed to an external structure from a gap formed between the LCD panel 1 and the circuit board 3.

Therefore, as shown in FIG. 4, when a metal foreign substance or the like enters from outside and adheres to the connection portion A on the back side of the LCD panel terminal 4 of the LCD panel 1 and the TAB output terminal 5 of the TAB 2, the adjacent LCD panel The terminal 4 and the TAB output terminal 5 are short-circuited by metal foreign matter,
There is a problem that a display abnormality such as a line defect of the panel 1 is caused.

A structure for solving this problem is disclosed in Japanese Patent No. 2847.
No. 831 (JP-A-3-184077). The structure disclosed in Japanese Patent No. 2847831 will be described with reference to FIG.

[0007] The structure described above, as shown in FIG.
In addition to covering the connection portion on the front side between the LCD panel terminal 4 of the panel 1 and the TAB output terminal 5 of the TAB 2 with the resin coat 6, the LCD panel terminal 4 of the LCD panel 1 and the TAB 2
Connection part on the back side of TAB output terminal 5 (part A in FIG. 4)
Is covered with a resin coat 6a.

[0008] In the structure shown in FIG.
Since the connection portion between the CD panel terminal 4 and the TAB output terminal 5 of the TAB 2 is covered from both the front and back sides, it is possible to prevent metal foreign matter or the like from entering this portion.

[0009] As shown in FIG.
The fact that the connection portion between the panel terminal 4 and the TAB output terminal 5 of the TAB 2 is airtightly covered from both front and back sides has the above-described advantage, but also has a disadvantage.

That is, in recent years, there has been an increasing demand for resource saving, repair use, and the like.
It is desired to deal with the repair of the D panel 1, the circuit board 3, and the TAB2.

[0011] As shown in FIG.
In a structure in which the connection portion between the D panel terminal 4 and the TAB output terminal 5 of the TAB 2 is sealed with resin coats 6 and 6a from both sides of the front and back, not only it takes time to peel off the resin coat 6a, but also peels off the resin coat 6a. In this case, the LCD panel terminal 4 of the LCD panel 1 or the TAB output terminal 5 of the TAB 2
May be peeled off, resulting in a new problem that the repairability is deteriorated. Japanese Patent No. 2,573,812 discloses a technique for preventing dust with a shield material. In this technique, the shield material is attached using a support board of a backlight.

[0012] It is an object of the present invention to take the technology disclosed in Japanese Patent No. 2573812 one step further and perform dust protection from a process stage before mounting a backlight support board, and include a process of mounting a backlight support board. To provide a liquid crystal display device with improved pairing in response to demands such as resource saving and repair use.

[0013]

In order to achieve the above object, a liquid crystal display device according to the present invention comprises an LC having an electrode portion.
In a liquid crystal display device including a D panel, a circuit board, and a TAB for connecting the LCD panel and the circuit board, a connection portion between the LCD panel and the TAB is covered with a dustproof sheet. is there.

Further, the dustproof sheet has a structure in which the dustproof sheet is detachably attached to a liquid crystal display device main body.

The dustproof sheet has an opposite side L.
It has a structure in which it is attached to a CD panel and the other side opposite to the CD panel is pressed against a circuit board by the elastic force of a dustproof sheet.

The dustproof sheet has an opposite side made of LC.
It has a structure in which it is attached to a D panel and a circuit board, respectively.

Further, the dust-proof sheet is interposed in a gap formed between the LCD panel and the circuit board, and the mounting position of the dust-proof sheet with respect to the LCD panel and the circuit board is opposed to each other across the gap. In this case, the dustproof sheet is bent to give a resilient force.

Further, both edges sandwiching the opposite side of the dustproof sheet are sandwiched and sealed by a frame of a liquid crystal display device main body.

The LC which is not covered with the dustproof sheet
It has a structure in which a connection portion between the D panel and the TAB is covered with a resin coat.

The dust-proof sheet has a structure subjected to an antistatic treatment.

The dust-proof sheet has a moisture-proof property.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a liquid crystal display device according to one embodiment of the present invention, and FIG. 2 is an LCD panel, a circuit board, and a TA in the liquid crystal display device according to one embodiment of the present invention.
FIG. 3 is an exploded perspective view showing a liquid crystal display device according to an embodiment of the present invention.

A liquid crystal display device according to an embodiment of the present invention shown in FIGS. 1 to 3 includes an LCD panel 1, a circuit board 3,
The configuration includes a TAB 2 that connects the LCD panel 1 and the circuit board 3.

As shown in FIGS. 1 to 3, the liquid crystal display device according to one embodiment of the present invention basically has a structure in which a connection portion between the LCD panel 1 and the TAB 2 is covered with a dustproof sheet 8. It is a feature.

The liquid crystal display device shown in FIG. 1 is a liquid crystal display device having a flat type structure, but the present invention is not limited to this type. For convenience of explanation, a liquid crystal display device having a flat type structure will be described as an example.

More specifically, the LCD panel 1 used in the flat-type liquid crystal display device is composed of a combination of two glass substrates, and the two glass substrates have a plurality of ITOs covered with an alignment film. Electrodes and these ITO
The liquid crystal is sealed between two glass substrates, and the TFT is placed on one of the glass substrates.
Is provided, a color filter is provided on the other substrate, and a polarizing plate is provided on two combined glass substrates.

The glass substrate on the side of the LCD panel 1 on which the TFT is provided is provided with the IT as a display electrode.
The LCD panel terminal 4 for taking out the O electrode to an external circuit
It is provided on the periphery of panel 1.

Since the structure of the LCD panel 1 shown in FIG. 1 is a general-purpose structure, the structure is not shown in cross section, and only the LCD panel terminals 4 are shown.

The circuit board 3 is horizontally attached to the LCD panel 1 as shown in FIGS.
Is provided with one or several capacitors, resistors, ICs and the like as necessary.

As shown in FIGS. 1 to 3, the circuit board 3 and the L
The CD panel 1 is electrically connected to the CD panel 1 by TAB2.

The TAB 2 has a structure in which a circuit is formed on a film made of polyimide and a driver IC 7 is mounted. When connecting the circuit board 3 and the TAB 2, as shown in FIG. Panel terminal 4, TAB output terminal 5 of TAB2, circuit board 3
And the TAB terminal 14 of the TAB 2 are electrically connected by the anisotropic conductive material 10, respectively.

In the embodiment shown in FIG. 1, the LCD panel 1
Although the driver IC 7 is mounted on the TAB 2 to drive the driver IC 7, the present invention is not limited to this. The driver IC 7 may be mounted on the circuit board 3 or the LCD panel 1. It is not always necessary to use the driver IC 7 as long as the driver IC 7 can be driven.

The circuit board 3 and the LCD panel 1 are TAB2
As shown in FIGS. 1 to 3, a gap S is formed between the LCD panel 1 and the circuit board 3 so that metal dusts and the like can flow through the LC panel 1 through the gap.
This gap S is inserted into the connection portion (portion A in FIG. 1) on the back side of the D panel terminal 4 and the TAB output terminal 5 of the TAB 2.
Need to be closed.

Therefore, the liquid crystal display device according to the present invention has a LC
The connection part A between the D panel 1 and the TAB 2 is covered with a dust-proof sheet 8, and the dust-proof sheet 8 is detachably attached to the main body of the liquid crystal display device.

More specifically, the dustproof sheet 8 is shown in FIG.
As shown in FIG. 2, the LCD panel 1 has a size that is large enough to close a gap S formed between the LCD panel 1 and the circuit board 3 facing each other. For example, a double-sided adhesive tape or the like is used to attach and detachably attach the other side 8 b to the dustproof sheet 8.
It has a structure in which it is pressure-bonded to the circuit board with the resilience of.

As shown in FIGS. 1 and 2, the dustproof sheet 8 has only one opposing side 8a attached to the LCD panel 1, but the other opposing side 8b is attached and removed with an adhesive such as a double-sided adhesive tape. It may be attached as possible. When the opposite sides 8a and 8b of the dust-proof sheet 8 are attached and detachably attached with an adhesive such as a double-sided adhesive tape, the dust-proof sheet 8 may be made of a material other than a material that stores elastic force. However, a material having elasticity may be used.

The dust-proof sheet 8 is interposed in a gap S formed between the LCD panel 1 and the circuit board 3, and the mounting position of the dust-proof sheet 8 with respect to the LCD panel 1 and the circuit board 3 is sandwiched by the gap S. By setting them at contradictory locations, the dustproof sheet 8 is flexed to provide elasticity.

That is, the LCD of the dustproof sheet 8 interposed in the gap S formed between the LCD panel 1 and the circuit board 3
The mounting position for the panel 1 is the outer end surface 1a of the LCD panel 1 with the gap S interposed therebetween.
The mounting position of the dust-proof sheet 8 on the LCD panel 1 and the circuit board 3 is set at an opposite position with the gap S therebetween as the inner end surface 3a of the circuit board 3 with the gap S therebetween. 8 is configured to bend to provide elasticity.

As shown in FIG. 3, the frame of the main body of the liquid crystal display device comprises an upper frame 11a and a lower frame 11b.
The LCD panel 1 is positioned by pressing the corner 1b of the LCD panel 1 against the guide 12 of the lower frame 11b.
a and the lower frame 11b sandwich the periphery of the LCD panel 1. In FIG. 3, a part of the lower frame 11b hidden by the LCD panel 1 is also drawn by a solid line to clarify the relationship between the upper frame 11a, the LCD panel 1, and the lower frame 11b.

As shown in FIG. 3, inside the guide 12,
The tongue piece 13 supporting the periphery of the LCD panel 1 is an upper frame 11a.
Since both the edges 8c and 8d (see FIG. 2) sandwiching the opposing sides 8a and 8b of the dustproof sheet 8 are provided on both the frame 11a and the lower frame 11b, the frame 11a and 11b of the main body of the liquid crystal display device, particularly the upper frame 11a. And the tongue piece 13 of the lower frame 11b to seal the gap S on both ends 8c and 8d, which sandwich the opposing sides 8a and 8b of the dustproof sheet 8, with the dustproof sheet 8. As shown in FIG. 3, a gap S between adjacent TABs 2 and 2 is closed by a frame portion 11c of the upper and lower frames 11a and 11b, so that metal dust does not enter the gap S.

In the embodiment, the sealing process of the both edges 8c, 8d sandwiching the opposing sides 8a, 8b of the dustproof sheet 8 is performed by the frames 11a, 11b of the main body of the liquid crystal display device, in particular, the tongue of the upper frame 11a and the lower frame 11b. Although the process is performed using the piece 13, the present invention is not limited to this, and the opposing sides 8 a,
Any structure may be used as long as the structure can seal both end edges 8c and 8d sandwiching 8b.

Also, as shown in FIG. 1, a connection portion between the LCD panel 1 and the TAB 2 which is not covered with the dustproof sheet 8 is covered with the resin coat 6. Therefore, since the connection portion B on the front side of the LCD panel terminal 4 of the LCD panel 1 and the TAB output terminal 5 of the TAB 2 is covered with the resin coat 6, the LCD panel terminal 4 of the LCD panel 1 and the TAB output terminal 5 of the TAB 2 are connected. The foreign matter made of metal or the like is prevented from being mixed into the connection portion B on the front side by the resin coat 6. The resin coat 6 is made of a silicone resin.

Further, the dustproof sheet 8 has a structure subjected to an antistatic treatment. In the present invention, for example, polycarbonate, PET, polyester or the like, which has been subjected to an antistatic treatment, is used as the dustproof sheet 8. However, the present invention is not limited to this. It is desirable to use a moisture-proof sheet as the dust-proof sheet 8; however, the present invention is not limited to this, and a sheet having a structure that has air permeability but blocks only metal foreign matter or the like may be used. Good thing.

In the present invention, as shown in FIG.
The D panel 1 and the TAB 2 are connected by using the anisotropic conductive film 10, and the TAB 2 and the circuit board 3 are also connected by using the anisotropic conductive film 10. As shown in (1), dust clearance processing is performed on the gap S formed between the LCD panel 1 and the circuit board 3.

That is, as shown in FIGS. 1 and 2, the dustproof sheet 8 is interposed in the gap S formed between the LCD panel 1 and the circuit board 3, and the dustproof sheet 8 is By setting the attachment position with respect to 3 at a position opposite to the gap S, the dustproof sheet 8 is bent to give elasticity.

That is, the LCD of the dustproof sheet 8 interposed in the gap S formed between the LCD panel 1 and the circuit board 3
The mounting position for the panel 1 is the outer end surface 1a of the LCD panel 1 with the gap S interposed therebetween.
The mounting position of the dust-proof sheet 8 on the LCD panel 1 and the circuit board 3 is set at an opposite position with the gap S therebetween as the inner end surface 3a of the circuit board 3 with the gap S therebetween. 8 to provide a resilient force, and the resilient force is applied to the opposing side 8 of the dustproof sheet 8.
b to the inner end face 3 a of the circuit board 3,
The gap S formed between the edge of the LCD panel 1 to which the opposite sides 8a and 8b are attached and the edge of the circuit board 3 is sealed with a dustproof sheet 8.

Next, the corner 1b of the LCD panel 1 is pressed against the guide 12 of the lower frame 11b shown in FIG.
Of the dust-proof sheet 8, the opposite edges 8 c and 8 d (see FIG. 2) sandwiching the opposing sides 8 a and 8 b of the dust-proof sheet 8 are sandwiched between the tongue pieces 13 of the upper and lower frames 11 a and 11 b of the main body of the liquid crystal display device. The gap S on the side of both ends 8c, 8d sandwiching the opposing sides 8a, 8b is sealed with the dustproof sheet 8.

As a result, the gap S formed between the LCD panel 1 and the circuit board 3 is completely closed by the dustproof sheet 8, and the adjacent LCD panel terminal 4 and the TAB output terminal 5 are made of metal through the gap S. Foreign matter and the like are prevented from adhering, and a display abnormality such as a line defect of the LCD panel 1 due to a short circuit between the LCD panel terminal 4 and the TAB output terminal 5 can be prevented. Further, dust can be prevented by the dust-proof sheet 8 from the stage in which the LCD panel 1, the circuit board 3, and the TAB 2 are combined, and dust can be prevented in a manufacturing line including a backlight assembly process performed in a later process. .

Further, as shown in FIGS. 1 and 2, the dustproof sheet 8 is detachably attached to the LCD panel 1 with its opposite side 8a attached to the LCD panel 1 with an adhesive such as a double-sided adhesive tape.
The opposite side 8b is pressed against the circuit board by the resilience of the dust-proof sheet 8 so that the LCD panel 1 can be easily repaired when the liquid crystal display device is repaired.
The dustproof sheet 8 can be removed without peeling off the panel terminal 4 or the TAB output terminal 5 of the TAB 2, thereby improving repairability.

Further, in order to securely seal both edges 8c and 8d (see FIG. 2) sandwiching the opposite sides 8a and 8b of the dustproof sheet 8, the LCD panel terminals 4 and T
It is possible to completely prevent metal dust and the like from adhering to the back connection portion A of the TAB output terminal 5 of the AB 2.

Further, as shown in FIG. 1, the connection portion B between the LCD panel 1 and the TAB 2 which is not covered with the dustproof sheet 8 is covered with the resin coat 6, so that the LCD panel terminal 4 of the LCD panel 1 and the TAB output terminal 5 of the TAB 2 are connected. The resin coat 6 can prevent metal foreign matter or the like from being mixed into the connection portion B on the front side.

Since the resin coating 6 is not attached to the gap S between the LCD panel 1 and the circuit board 3 but is a place where the resin coating 6 can be directly removed from the front side, the resin coating 6 is removed. The work can be performed easily as compared with the conventional technique shown in FIG. 5, and the accident of peeling off the LCD panel terminal 4 of the LCD panel 1 or the TAB output terminal 5 of the TAB 2 can be prevented, and the repairability can be improved. .

In addition, the dustproof sheet 8 is particularly provided on one of the opposite sides 8.
a is attached to the end face 1a of the LCD panel 1 and the other opposing side 8b is pressure-bonded to the end face 3a of the circuit board 3, thereby facilitating attachment / detachment and greatly affecting repairability. In addition, an effect of preventing foreign matter from being mixed can be obtained.

The present invention can be applied not only to a liquid crystal display device which is a desktop type or a notebook type display device but also to a liquid crystal display device such as a mobile type display device.

[0056]

As described above, according to the present invention, it is possible to prevent foreign matter such as metal from adhering to the adjacent LCD panel terminal and TAB output terminal, and to prevent the LCD panel terminal and TAB output terminal from being short-circuited. An abnormal display such as a line defect of the panel 1 can be prevented.

Further, since the dustproof sheet and the like can be removed, the repairability can be improved, and the terminal of the LCD panel or TAB can be removed by removing the dustproof sheet and the like.
Can be obtained without peeling off the terminal and without significantly affecting the repairability.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a connection relationship between an LCD panel, a circuit board, and TAB in the liquid crystal display device according to the embodiment of the present invention.

FIG. 3 is an exploded perspective view of a liquid crystal display device according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a liquid crystal display device according to a conventional example.

FIG. 5 is a sectional view showing another liquid crystal display device according to a conventional example.

[Explanation of symbols]

 Reference Signs List 1 LCD panel 2 TAB 3 Circuit board 4 LCD panel terminal 5 TAB output terminal 6 Resin coat 7 Driver IC 8 Dustproof sheet

Claims (9)

[Claims] 1. A liquid crystal display device including an LCD panel having an electrode portion, a circuit board, and a TAB for connecting the LCD panel and the circuit board, wherein a connection portion between the LCD panel and the TAB is a dustproof sheet. A liquid crystal display device characterized in that the liquid crystal display device is configured to be covered with a liquid crystal display. 2. The liquid crystal display device according to claim 1, wherein the dustproof sheet has a structure that is detachably attached to a liquid crystal display device main body. 3. The dust-proof sheet has an opposite side having an LC side.
2. The liquid crystal display device according to claim 1, wherein the liquid crystal display device has a structure in which the other side facing the D panel is pressed against a circuit board by the resilience of a dustproof sheet. 4. The LCD device according to claim 1, wherein the opposite side of the dustproof sheet is an LCD.
The liquid crystal display device according to claim 1, wherein the liquid crystal display device has a structure in which the panel is attached to a panel and a circuit board, respectively. 5. The dust-proof sheet is interposed in a gap formed between the LCD panel and the circuit board, and a mounting position of the dust-proof sheet with respect to the LCD panel and the circuit board is opposite to each other with the gap interposed therebetween. The liquid crystal display device according to claim 3, wherein the liquid crystal display device has a structure in which the dustproof sheet is bent to give elasticity by being set at a location. 6. The liquid crystal according to claim 3, wherein both edges sandwiching the opposite side of the dustproof sheet are sandwiched and sealed by a frame of a liquid crystal display device main body. Display device. 7. The LCD not covered with the dustproof sheet
The liquid crystal display device according to claim 1, wherein a connection portion between the panel and the TAB is covered with a resin coat. 8. The apparatus according to claim 1, wherein the dustproof sheet has a structure subjected to an antistatic treatment.
8. The liquid crystal display device according to 4, 5, 6, or 7. 9. The dustproof sheet according to claim 1, wherein the dustproof sheet has a moistureproof property.
9. The liquid crystal display device according to 7 or 8.