JP2000235176A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device structure which facilitates assembly work of a circuit board and facilitates overhaul as well of a liquid crystal display device having a liquid crystal display panel and circuit board mounted on a supporting body. SOLUTION: L-shaped hooks 41a of a rectangular shape in plan view are formed on the rear surface of a light transmission plate part 41 in the positions corresponding to detaining holes 35f on the outer side of the effective display region 30A of the liquid crystal display panel 30 shown in (a). T-shaped projections 41b of the rectangular shape in plan view are formed in the positions corresponding to fitting holes 35g. The L-shaped hooks 41a are inserted into the detaining holes 35f of the circuit board 35 and detain the opening edges of the detaining holes 35f so as to press the same from above. The T-shaped projections 41b are fitted into the fitting holes 35g of the circuit board 35 from above.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a liquid crystal display device, and more particularly to a structure of a liquid crystal display device having a structure in which a liquid crystal display panel and a circuit board are mounted on a support having a function as a light guide plate.

[0002]

2. Description of the Related Art In general, a liquid crystal display device has a liquid crystal display panel having a structure in which a liquid crystal layer is sandwiched between two transparent substrates. In order to fix the liquid crystal display panel inside various devices, a support to which the liquid crystal display panel is attached may be used. As the support, there is a support having only a function as an intervening body for simply fixing the liquid crystal display panel inside the device, and a support also serving as a backlight of the transmission type liquid crystal display panel.

In some cases, a circuit board such as a flexible printed circuit board (FPC) or a tape carrier package (TCP) is conductively connected to external terminals formed on a liquid crystal display panel. In a structure for mounting a panel, the circuit board may be mounted and held so as to overlap the back side of the support.

As an example of a liquid crystal display device having the above-described structure, there is a liquid crystal display device having a schematic structure shown in FIG. 5 for use in a relatively small electronic device such as a mobile phone. FIG. 5 is a schematic schematic sectional view showing a sectional structure of the liquid crystal display device. The liquid crystal display panel 10 has a known structure in which transparent substrates 11 and 12 made of glass or the like are bonded together, a liquid crystal layer (not shown) is sealed with a sealing material 13, and a polarizing sheet is bonded on the outer surfaces of the transparent substrates 11 and 12. It is provided with. On one side of the liquid crystal display panel 10, an overhang region 11 a of the transparent substrate 11 that extends beyond the transparent substrate 12 is provided. An external terminal portion 14 in which a number of external terminals are arranged in parallel is formed on the overhang region 11a. The above liquid crystal display panel 10
It is stuck on the front surface of the support 20 formed in a plate shape with a double-sided adhesive tape or the like.

The support 20 includes a plate-shaped light guide plate 21 formed to overlap the liquid crystal display panel 10 and a light guide plate 2.
1 has a frame-shaped portion 22 formed in a frame shape so as to be in contact with the end in the direction of the paper surface of FIG. 1 and a mounting hole formed at an end of the frame-shaped portion 22 and provided with a mounting hole for mounting inside various devices. Part 2
3 is provided. A reflection film 24 made of a white resin plate or the like is adhered on the back surface of the light guide plate portion 21.

The liquid crystal display panel 10 has a flexible circuit board 15 made of a flexible resin sheet as a base material.
Are conductively connected. More specifically, a conductive connection portion 15a formed at one end of the circuit board 15 is conductively connected to the external terminal portion 14 via a method such as thermocompression bonding via an anisotropic conductive layer or the like. . Circuit board 15
Is folded back from the conductive connecting portion 15a to the back side of the support 20 and deformed so as to overlap along the light guide plate portion 21, and on the surface of the light guide plate portion 21 or the reflective film 24 stuck thereon. , With a double-sided adhesive tape 25 interposed therebetween. The circuit board 15 is provided with the conductive connection portion 15a.
And the support 2 formed following the conductive connection portion 15a.
0, a folded portion 15b bent from the front side to the back side, and a support 2 following the folded portion 15b.
0 is provided on the back side with a double-sided adhesive tape 25. Generally, the folded portion 15b is formed only with a wiring circuit drawn out from the conductive connection portion 15a, and the overlapping arrangement portion 15c is for irradiating the liquid crystal driving circuit and the light guide plate portion 21 connected to the wiring circuit with light. A light source driving circuit and the like including the light-emitting elements of FIG.

[0007]

However, in the above-mentioned conventional liquid crystal display device, the circuit board 15 is fixed to the back side of the support 20 by the double-sided adhesive tape 25. Work including the steps of removing the release paper, sticking on the surface of the support 20, removing the release paper on the other side, and attaching the liquid crystal display panel 10 is necessary. There was a problem that it took time and effort.

Further, the circuit board 15 is attached to a double-sided adhesive tape 25.
Once adhered to the support 20, it is extremely difficult to remove the circuit board 15 from the support 20 even if the circuit board 15 is to be disassembled due to the occurrence of a defect in a subsequent process. The adhesive may remain on the panel surface or the support surface, and there is a problem that it is extremely difficult to disassemble and repair.

Further, when the liquid crystal display device is incorporated in a device body such as a mobile phone and mounted, it is necessary to supply power, data signals and various control signals from a circuit board on the device body side. Electrical connection with the circuit board of the device main body is required, and it is necessary to accurately fix the connection terminal portion 15e of the circuit board 15 at a position determined in accordance with the restriction on the connection position.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a liquid crystal display device having a liquid crystal display panel and a circuit board attached to a support, in which the circuit board can be easily assembled. It is intended to provide a device structure that can be easily disassembled and repaired.

[0011]

In order to solve the above-mentioned problems, a liquid crystal display device according to the present invention comprises a support integrally formed having a light guiding function, and a support attached to a front side of the support. A liquid crystal display panel, comprising: a liquid crystal display panel; and a circuit board conductively connected to external terminals formed on the liquid crystal display panel, wherein the circuit board is mounted on a back side of the support. At least a locking structure configured to lock an edge of the circuit board, and a fitting structure configured to fit and hold the circuit board to the support are provided on a back side of the device. It is characterized by having either one.

According to the present invention, since the edge of the circuit board is locked by the locking structure, the circuit board can be temporarily held on the back side of the support. Since the circuit board can be fitted and held by the fitting structure, the circuit board is reliably positioned in a state where the circuit board is positioned by the locking by the locking structure and / or the fitting by the fitting structure. It can be attached to a support having a light guiding function. At this time, the circuit board is temporarily held on the back side of the support by the locking structure, and in this state, the fitting structure can be fitted to the circuit board by the fitting structure. The work of attaching to the support can be easily performed, and the circuit board once attached can be easily removed in the reverse order. In addition, even when the positional accuracy of the circuit board with respect to the support is required, the positioning can be performed with high accuracy by appropriately setting the fitting dimension between the fitting structure and the circuit board.

Further, in the present invention, the locking structure portion has a hook shape configured to protrude from the back surface of the support and then to protrude sideways to hold an edge of the circuit board. Is preferred. ADVANTAGE OF THE INVENTION According to this invention, a circuit board can be hold | maintained on the back side of a support body easily by latching so that the edge part of a circuit board may go under a hook shape lower side.

In the above liquid crystal display device, the circuit board has a locking opening through which the locking structure is inserted,
The opening edge of the locking opening is configured to be held by the hook shape.

According to this liquid crystal display device, the locking structure is inserted into the locking opening, and then the locking structure is locked to the opening edge of the locking opening. Thus, the locking state between the locking structure and the locking opening is less likely to come off, and the circuit board can be reliably held on the support. Here, the locking opening means not only a hole-shaped opening formed on the board surface of the circuit board, but also a slit-shaped or concave-shaped opening cut from the peripheral edge of the circuit board. Is also included.

In the present invention, the circuit board is conductively connected to the external terminals of the liquid crystal display panel disposed on the front side of the support, and is bent toward the back side of the support, and The structure portion is provided with an overhang portion extending from a bent portion of the circuit board in a direction in which the circuit board is pulled out to the back side of the support or in a direction opposite thereto.

According to the present invention, the locking structure is provided with the extending portion extending in the direction in which the circuit board is pulled out to the back side of the support or in the opposite direction, thereby extending the edge of the circuit board. By slipping under the protruding portion and sliding in the above-described direction or the opposite direction, the edge of the circuit board is locked to the locking structure and can be held on the support, so that the locking work is easier. Can be done.

In the present invention, it is preferable that the locking structure has a substantially L-shape.

In the present invention, the fitting structure may have a projection shape protruding from a back surface of the support, and the circuit board may have a fitting opening fitted to the fitting structure. Is desirable. According to this means, the projecting shape of the fitting structure is fitted into the fitting opening of the circuit board, and the circuit board can be positioned and held on the support. Here, the fitting opening means not only a hole-shaped opening formed on the board surface of the circuit board, but also a slit-shaped or concave-shaped opening cut from a peripheral edge of the circuit board. Including.

In the present invention, the fitting structure portion may have a width at least in a predetermined direction larger than a diameter of the fitting opening at a predetermined portion protruding from the base of the projection shape, and And a fitting holding portion having a shape that can be fitted into the device.

According to the present invention, the fitting structure portion has a width at least in the predetermined direction larger than the diameter of the fitting opening at the predetermined portion in the projecting direction from the base of the projection shape, and fits into the fitting opening. Since it has a possible shape, it is possible to prevent the fitting state from coming off.

Here, the fitting opening can be fitted, and the width in the predetermined direction is larger than the diameter of the fitting opening. Therefore, the width in the predetermined direction is larger than the diameter of the fitting opening. It is preferable to provide a fitting holding portion in which the width in the direction different from the direction is smaller than the diameter of the fitting opening. According to this liquid crystal display device, when the fitting holding portion of the fitting structure is fitted into the fitting opening, the fitting opening is temporarily deformed so as to pass through the fitting holding portion, and then fitted. Since the joint opening can be returned to the original shape and fitted to the protrusion-shaped base of the fitting structure,
The fitting operation is easy, and it is possible to set the fitting size with a small play between the base and the fitting opening. This is advantageous in that accurate positioning can be performed and the fitting state can be prevented from coming off.

In the present invention, it is preferable that the fitting holding portion of the fitting structure has a substantially T-shaped or mushroom-shaped head.

Further, in the present invention, it is preferable that the support is configured to expose a peripheral end face of the circuit board to the side at least in the vicinity of the fitting structure. According to this means, the exposed peripheral end face of the circuit board can be pulled up from the support in the vicinity of the fitting structure portion by using a tool having a thin plate-shaped tip portion or the like. The work of removing the fitting portion of the board becomes easy.

Next, the liquid crystal display device according to the present invention comprises an integrally formed support having a light guide function, a liquid crystal display panel mounted on the front side of the support, and the liquid crystal display. A circuit board conductively connected to external terminals formed on the panel, wherein the circuit board is attached to the surface of the circuit board and the support in a liquid crystal display device mounted on the back side of the support. The circuit board is attached to the back side of the support by a single-sided adhesive sheet.

According to the present invention, the circuit board can be extremely easily attached to the support by sticking the single-sided adhesive sheet to the front surface of the circuit board and the support. Since the adhesive sheet is exposed to the outside, it can be easily peeled off. Therefore, the assembling work and the removing work of the liquid crystal display device can be performed more easily than before.

In the present invention, the single-sided pressure-sensitive adhesive sheet is preferably a device identification tag. According to the present invention, the circuit board can be attached to the support by an identification tag that records some information for identifying the liquid crystal display device, so that there is no need to provide a structure for attachment or a separate attachment component. In addition, the structure can be simplified and the number of parts can be reduced.

Further, in the present invention, the circuit board has a planar shape that exposes a part of the back surface of the support in the mounted state, and the single-sided adhesive sheet includes the part and the part facing the part. It is preferable that it is stuck so as to straddle the periphery of the circuit board. According to this means,
Since the planar shape of the circuit board is formed so as to expose a part of the back surface of the support, the single-sided adhesive sheet can be more easily and reliably adhered to the circuit board and the support.

Further, in the present invention, it is preferable that the circuit board is provided with an exposure opening for exposing the part. The exposure opening includes a slit-shaped or concave-shaped opening cut from a peripheral edge of the circuit board, in addition to a hole-shaped opening formed on the substrate surface of the circuit board. . In this case, by providing the opening for exposure, the shape of the circuit board is less restricted, and an exposed portion of the support for appropriately attaching the single-sided adhesive sheet can be provided at an arbitrary position.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the liquid crystal display device according to the present invention will be described in detail. Of the embodiments described below, the first and second embodiments relate to a liquid crystal display device having a circuit board fixed with a locking structure and a fitting structure on the back side of a support. The third embodiment relates to a liquid crystal display device in which a single-sided adhesive sheet is attached to the surface of a circuit board and the back of a support to fix the circuit board.

FIG. 1 is a plan view (a) and a side view (b) showing a schematic structure of a first embodiment of a liquid crystal display device according to the present invention. In this embodiment, a liquid crystal display panel 30 similar to that shown in FIG. 5 is mounted on the front side (lower side in the figure) of a support 40 made of a transparent synthetic resin or the like.

A liquid crystal display panel 3 similar to that shown in FIG.
A conductive connection portion 35a of a flexible circuit board 35 made of a flexible printed circuit (FPC), a tape carrier package (TCP), or the like is conductively connected to an external terminal portion (not shown). The details of the wiring patterns and the mounted components on the circuit board 35 are omitted for easy understanding of the configuration.
The circuit board 35 is bent at a portion shown as a folded portion 35b connected to the conductive connecting portion 35a and folded back toward the back side of the support 40, and a rectangular overlapping arrangement portion 35c guides light from a light source (not shown). It is attached so as to overlap on the back surface of the support 40 having a function. A protruding wiring lead portion 35d is formed at the tip of the overlapping arrangement portion 35c of the circuit board 35, and a connection terminal portion 35e is formed at the tip of the wiring drawing portion 35d. The connection terminal portion 35e is electrically connected to a connector or the like provided on a circuit board of a device main body provided inside various devices on which the liquid crystal display device is mounted and incorporated.

A pair of rectangular shapes are formed on the overlapping arrangement portion 35c of the circuit board 35 at the front end side (left side in the drawing) of the folded portion 35b of the circuit board 35 toward the back side of the support 40 from the folded portion 35b. Locking hole 35 serving as a locking opening
f is formed, and a circular fitting hole 35g, which is a pair of fitting openings, is formed on the rear end side (right side in the figure).

As in the case of the support 20 shown in FIG. 5, the support 40 has a light guide plate portion 41, a frame portion 42, and a mounting portion 43 formed thereon. 1 is provided on the back surface of the light guide plate portion 41.
The effective display area 30A of the liquid crystal display panel 30 shown in FIG.
A L-shaped hook 41a having a rectangular shape in a plan view is formed on the outside and at a position corresponding to the locking hole 35f. A T-shaped projection 41b having a rectangular shape in a plan view is formed at a position corresponding to the fitting hole 35g. L-shaped hook 41a
Is inserted into the locking hole 35f and locked so as to press down the opening edge of the locking hole 35f from above (the folded portion 35b side). As shown in FIG. 2, the L-shaped hook 41a is
An L-shape including a base 41a-1 protruding from the back surface of the light guide plate portion 41, and an overhang portion 41a-2 projecting from the tip of the base portion 41a-1 substantially parallel to the back surface of the light guide plate portion 41 and projecting therefrom. It has a shape. On the other hand, the T-shaped projection 41b having the projection-shaped fitting holding portion as the head is fitted in the fitting hole 35g, and positions the circuit board 35 on the back surface of the light guide plate portion 41. As shown in FIG. 2, the T-shaped projection 41 b has a base 41 b-1 protruding from the back surface of the light guide plate 41, and a head 41 b-2 having a shape enlarged in the left-right direction in the drawing at the tip of the base 41 b-1. And has a T-shape.

The frame portion 42 of the support 40 is formed in a frame shape so as to protect the circuit board 35 disposed on the back surface of the light guide plate portion 41 from both sides. A notch or concave portion is formed in the vicinity of the T-shaped protrusion 41b in the frame-shaped portion 42 so that a part of the peripheral edge surface 35h of the circuit board 35 superimposed on the light guide plate portion 41 is exposed to the side and faced. An end face exposing groove 42a is formed. Further, the opening may be formed in the frame portion 42.

FIG. 2 is a schematic end view showing a procedure for mounting the circuit board 35 on the back surface of the support 40 of the present embodiment. As shown in FIG. 2A, the liquid crystal display panel 30
The circuit board 35 conductively connected to the external terminal portion 34 is folded back toward the back side of the support 40 and is extended along the support 40 as shown by the arrow in the figure. Next, as shown by the arrow in the figure, the circuit board 35 is brought closer to the support 40, and the locking hole 35f formed on the tip end side of the circuit board 35 is set to L
It is inserted through the mold hook 41a. Next, the circuit board 35 is slid along the plate surface of the support 40 as shown by the arrow in the drawing, and the left side of the opening edge of the locking hole 35f in the figure is extended by the overhanging portion 41a-2 of the L-shaped hook 41a. To be locked.

When the opening edge of the locking hole 35f is locked by the projection 41a-2 of the L-shaped hook 41a as described above, the circuit board 35 is supported in the state shown in FIG. 40
Temporarily held on the back. In this state, the portion of the circuit board 35 near the base of the overlapping arrangement portion 35c is shown in FIG.
As shown by the arrow (b), the fitting hole 35g is pressed toward the support 40, and the fitting hole 35g passes through the head 41b-2 of the T-shaped projection 41b while slightly deforming, and the base 4 of the T-shaped projection 41b.
By fitting into 1b-1, the circuit board 35 comes into close contact with the back surface of the support 40 (on the reflection film 44 attached to the back surface of the light guide plate portion 41). At this time, the fitting hole 35
Since the g and the T-shaped protrusion 41b are fitted to each other, the circuit board 35 is positioned in a planar manner on the back surface of the support 40.

According to this embodiment, the L-shaped hook 41a
The circuit board 35 is held on the back side of the support body 40 by locking the opening edge of the locking hole 35f, and then the T-shaped projection 41b is fitted into the fitting hole 35g, so that the circuit board 35 The overlapping arrangement part 35c is the light guide plate part 41.
And is positioned in the planar direction. Therefore, the circuit board 35 can be easily supported by the support 4.
0 can be attached. Further, by removing the T-shaped projection 41b from the fitting hole 35g and further removing the L-shaped hook 41a from the locking hole 35f, the circuit board 35 can be easily removed from the support 40.

Here, as shown in FIG. 1, a notch-shaped end face exposing groove 42a is formed in the frame portion 42 of the support 40, so that the circuit mounted on the back side of the support 40 is formed. Since the peripheral end surface 35h of the substrate 35 is exposed to the side, a tool such as a driver is inserted between the peripheral end surface 35h of the circuit substrate 35 and the light guide plate portion 41 from the end surface exposing groove 42a to form the T-shaped projection 41b. By releasing the fitting state with the fitting hole 35g, the circuit board 35 can be easily removed from the support 40 and separated.

In this embodiment, the position of the circuit board 35 in the planar direction is accurately positioned by fitting the T-shaped projection 41b and the fitting hole 35g. The position of the connection terminal portion 35e thus obtained can be accurately obtained, and when a liquid crystal display device is mounted and fixed inside various devices, it is possible to prevent the occurrence of a connection failure due to a displacement of the connection terminal portion 35e.

In the present embodiment, the liquid crystal display panel 30
Although the example in which the circuit board 35 is directly conductively connected to the liquid crystal display panel has been described, the first terminal is formed of a tape carrier package (TCP) in which electronic components such as a semiconductor chip and a chip capacitor are mounted on the external terminals of the liquid crystal display panel. A circuit board is conductively connected, a second circuit board such as a flexible printed circuit board (FPC) is further conductively connected to the first circuit board, and the second circuit board is attached to the back side of the support 40. May be. In this case, the first circuit board may be a flexible printed circuit board (FPC) in which electronic components such as a semiconductor chip and a chip capacitor are mounted by solder or an anisotropic conductive film, or the second circuit board. Electronic components may be mounted on the board, or the first circuit board and the second circuit board may be interchanged and connected.

Further, the semiconductor chip may be mounted on the liquid crystal display panel 30 by COG (Chip On Glass).

The head 41b of the T-shaped projection 41b
2 is formed so as to widen in the front-back direction (the left-right direction in the drawing) of the circuit board 35, but the head widening direction is arbitrary. It is preferable that the shape of the head has an extended shape including a portion that is wider than the inner diameter of the fitting hole 35g and a portion that is narrower than the inner diameter of the fitting hole 35g, as in the above embodiment. This is so configured that the fitting hole 35g is temporarily deformed so that the head 41b-2 can pass through the fitting hole 35g, and after passing through the head, the fitting hole 3g is formed.
5g can be configured to return to the original shape and fit with the base portion 41b-1 with little play, and when the base portion 41b-1 and the fitting hole 35g are fitted, the head 4
This is because the widened shape of 1b-2 makes it difficult for the fitted state to come off. However, the shape of the T-shaped projection 41b is arbitrary as long as the required positioning accuracy can be obtained. For example, the T-shaped projection 41b may have a mushroom shape whose head is expanded in all directions.

[Second Embodiment] Next, a second embodiment according to the present invention will be described with reference to FIG. In this embodiment, a support 60 having a function of guiding light from a light source (not shown) to which a liquid crystal display panel 50 similar to the first embodiment is attached is provided. A first circuit board 55 is conductively connected to the external terminal section 54 of the liquid crystal display panel 50. The first circuit board 55 is a tape carrier package (TCP) provided with a flexible base material on which a semiconductor chip which is a driver for driving a liquid crystal display panel (not shown) is mounted in the present embodiment. This first circuit board 5
Reference numeral 5 denotes a support member 60 which is electrically connected to the external terminal portion 54 of the liquid crystal display panel 50 by a conductive connection portion 55a.
Is bent back to the back side of the support 60. A connection terminal portion 55b is provided at the end of the first circuit board 55.
Is formed, and the connection terminal portion 55b is connected to the second circuit board 56.
Is electrically conductively connected to the connection terminal portion 56a. A protruding wiring lead portion 56b is formed at the tip of the second circuit board 56, and a connection terminal portion 56c is formed at the tip of the wiring drawing portion 56b. The connection terminal 56c is electrically connected to, for example, a connector on a circuit board side of a device main body provided in various devices on which a liquid crystal display device is mounted and incorporated.

The support 60 is provided with a light guide plate 61 similar to the above.
And a frame 62, and a printed circuit board 64 on which a light source such as a light emitting diode array is mounted is fixed along one side of the frame 62. The printed board 64 is a power supply circuit (not shown) configured in the second circuit board 56.
And a wiring pattern (not shown) connected to a light source control unit (not shown) and an end of the second circuit board are conductively connected by a conductor 65 such as a metal terminal or solder.

This embodiment also has a locking structure and a fitting structure arranged outside the effective display area 50A of the liquid crystal display panel 50. The second circuit board 56 has a pair of rectangular locking holes 56d and a pair of circular fitting holes 56d.
e is formed. The light guide plate 6 of the support 60
1 has an L-shaped hook 61 similar to that of the first embodiment.
a and a T-shaped projection 61b are formed. L-shaped hook 6
1a can be inserted into the locking hole 56d, and the L-shaped hook 6
The projection 1a locks the opening edge of the locking hole 56d. Also, the head of the T-shaped projection 61b has a fitting hole 5
6e is configured to be insertable while slightly deforming it, and the base of the T-shaped projection 61b is configured to fit into the fitting hole 56e.

In this embodiment, since the second circuit board 56 is attached to the printed board 64 fixed to the support 60 by the conductor 65 by soldering or the like,
Although it is difficult to remove the second circuit board 56, it is possible to achieve substantially the same effects as in the first embodiment.

The contents of the assembling process in this embodiment are as follows. First, in a state where the first circuit board 55 and the second circuit board 56 are conductively connected to each other, the liquid crystal display attached to the front side of the support body 60 is connected. Conductive connection 5 between panel 50
The first circuit board 55 and the second circuit board 56 are folded back from 5a to the back side of the support 50. Next, the second circuit board 56
Is inserted through the L-shaped hook 61a protruding from the light guide plate portion 61, the second circuit board 56 is slid slightly to the left in the drawing, and the locking hole 56d is drawn by the protruding portion of the L-shaped hook 61a. Engage the right opening edge. Further, in this state, the left side of the second circuit board 56 in the figure is pressed against the support 60, and the T-shaped projection 61b is fitted into the fitting hole 56e.
Since the second circuit board 56 is positioned in a planar manner with respect to the support body 60 in this manner, the second circuit board 5
6 and the light source unit 64 are electrically connected by a conductor 65.

Also in this embodiment, it is necessary to reduce the displacement between the support 60 and the connection terminal 56c.
Since the second circuit board 56 is accurately positioned by the fitting between the T-shaped projection 61b and the fitting hole 56e, the connection terminal portion 5
6c can be reduced. In particular, in the case of this embodiment, the fitting structure is formed on the side of the connection terminal 56c, which is advantageous in terms of positional accuracy.

Third Embodiment Finally, a third embodiment according to the present invention will be described with reference to FIG. This embodiment includes a liquid crystal display panel 70 and a support 40 similar to the liquid crystal display panel 30 of the first embodiment, and a circuit board 35 and a support 40 of the first embodiment.
And a circuit board 75 and a support 80 which are almost the same except for details.

The circuit board 75 is, as in the first embodiment,
The liquid crystal display panel 70 includes a conductive connection part 75a, a folded part 75b, an overlap arrangement part 75c, a wiring lead part 75d, and a connection terminal part 75e. The support 80 includes a light guide plate portion 81, a frame portion 82, and a mounting portion 83, as in the first embodiment.

The overlapping portion 7 of the circuit board 75 of the present embodiment
A concave notch portion 75f is formed on the peripheral edge portion on the tip side of 5c.
The notch-shaped portion 75f forms a part of the support 70 (the light guide plate portion 71 in the present embodiment) or the reflection film adhered to the support 70 by the circuit board 7.
5 is exposed without being covered. And
The single-sided adhesive sheet 90 is overlapped with the circuit board 75 on the overlapping portion 75c.
And the back surface of the support 70 exposed by the notch-shaped portion 75f. In the case of the present embodiment, the single-sided pressure-sensitive adhesive sheet 90 informs the liquid crystal display device of the present embodiment of some information such as the structure and type, lot number, serial number, manufacturing date, manufacturing location, shipping destination, and type of manufacturing process. The identification information 91 is recorded on the surface of the identification tag by a method such as printing.

In this embodiment, the circuit board 75 is attached to the back side of the support 80 by the single-sided adhesive sheet 90. Since the single-sided adhesive sheet 90 only needs to be adhered from the front side of the circuit board 75, the work of mounting the circuit board 75 can be performed extremely easily. In addition, the removal operation is not difficult as in the case of using a conventional double-sided adhesive tape, and the circuit can be extremely easily formed only by peeling the single-sided adhesive sheet 90 exposed on the surface of the circuit board 75. The substrate 75 can be removed. In this embodiment, when the mounting accuracy of the circuit board 75 to the support 80 is required, the positional accuracy can be ensured by positioning the circuit board 75 and the support 80 in contact with each other in the plane direction. For example, a contact portion between the peripheral end surface of the circuit board 75 and the frame portion 82 may be formed.

It should be noted that the liquid crystal display device of the present invention is not limited to the illustrated example described above, and it is needless to say that various changes can be made without departing from the scope of the present invention. In each of the above embodiments, the circuit board is bent from the front side to the back side of the support,
The circuit board may be disposed on the back side of the support and may be conductively connected to the liquid crystal display panel.

Further, each of the above-mentioned supports has a flat plate shape configured to cover the entire back surface of the liquid crystal display panel, but has a frame shape for fixing the peripheral portion of the liquid crystal display panel. Those having various structures and shapes can be used.

[0056]

As described above, according to the present invention,
The circuit board is temporarily held on the back side of the support by the locking structure, and in this state, the fitting structure can be fitted to the circuit board by the fitting structure. The mounting operation can be easily performed, and the circuit board once mounted can be easily removed in the reverse order. In addition, even when the positional accuracy of the circuit board with respect to the support is required, the positioning can be performed with high accuracy by appropriately setting the fitting dimension between the fitting structure and the circuit board.

[Brief description of the drawings]

FIG. 1 is a schematic plan view (a) and a schematic side view (b) showing the structure of a liquid crystal display device according to a first embodiment of the present invention.

FIGS. 2A and 2B are schematic end views (a) and (b) showing a procedure and a situation when a circuit board is attached to a support in the liquid crystal display device of the first embodiment.

FIG. 3 is a schematic plan view showing a structure of a liquid crystal display device according to a second embodiment of the present invention.

FIG. 4 is a schematic plan view showing the structure of a liquid crystal display device according to a third embodiment of the present invention.

FIG. 5 is a schematic sectional view showing the structure of a conventional liquid crystal display device.

[Explanation of symbols]

 10, 30, 50, 70 Liquid crystal display panel 15, 35, 75 Circuit board 20, 40, 60, 80 Support 21, 21, 61, 71 Light guide plate 22, 42, 62, 72 Frame 35f, 56d Stop holes 35g, 56e Fitting holes 41a, 61a L-shaped hooks (locking structure) 41b, 61b T-shaped projections (fitting structure) 55 First circuit board 56 Second circuit board 75f Cut-off section 90 Single-sided adhesive sheet

Claims (13)

[Claims] 1. A support integrally formed with a light guiding function, a liquid crystal display panel mounted on a front side of the support, and electrically connected to external terminals formed on the liquid crystal display panel. And a circuit board mounted on the back side of the support, wherein the circuit board is configured to lock an edge of the circuit board on the back side of the support. A liquid crystal display device comprising at least one of a locking structure portion and a fitting structure portion configured to fit and hold the circuit board on the support. 2. The locking structure according to claim 1, wherein the locking structure has a hook shape configured to protrude from a back surface of the support and then protrude laterally to hold an edge of the circuit board. A liquid crystal display device characterized by the above-mentioned. 3. The circuit board according to claim 2, wherein the circuit board includes a locking opening through which the locking structure is inserted, and an opening edge of the locking opening is held by the hook shape. A liquid crystal display device characterized in that: 4. One of claims 1 to 3
In the paragraph, the circuit board is conductively connected to the external terminals of the liquid crystal display panel disposed on the front side of the support and bent toward the back side of the support, and the locking structure portion is A liquid crystal display device comprising an overhang extending from a bent portion of the circuit board in a direction in which the circuit board is pulled out to the back side of the support or in a direction opposite thereto. 5. The method according to claim 1, wherein:
3. The liquid crystal display device according to claim 1, wherein the locking structure has a substantially L-shape. 6. Any one of claims 1 to 5
In the paragraph, the fitting structure portion has a projection shape protruding from the back surface of the support, and the circuit board is formed with a fitting opening for fitting to the fitting structure portion. Liquid crystal display. 7. The fitting structure according to claim 6, wherein:
At a predetermined portion in a protruding direction from the base of the protruding shape, a width of at least a predetermined direction is larger than a diameter of the fitting opening, and a fitting holding portion having a shape capable of fitting into the fitting opening is provided. A liquid crystal display device comprising: 8. The liquid crystal display device according to claim 7, wherein the fitting holding portion of the fitting structure has a substantially T-shaped or mushroom-shaped head. 9. Any one of claims 1 to 8
3. The liquid crystal display device according to item 1, wherein the support is configured to expose a peripheral end face of the circuit board to the side at least in the vicinity of the fitting structure. 10. A support integrally formed with a light guiding function, a liquid crystal display panel mounted on a front side of the support, and conductively connected to external terminals formed on the liquid crystal display panel. A liquid crystal display device comprising: a circuit board provided on the back side of the support, wherein the circuit board is provided by a single-sided adhesive sheet attached to the surface of the circuit board and the support. A liquid crystal display device, which is attached to the back side of the support. 11. The liquid crystal display device according to claim 10, wherein the one-sided pressure-sensitive adhesive sheet is a device identification tag. 12. The method according to claim 10, wherein
The circuit board has a planar shape that exposes a part of the back surface of the support in the mounted state, and the single-sided adhesive sheet straddles the part and a peripheral portion of the circuit board facing the part. A liquid crystal display device, which is attached to a liquid crystal display device. 13. The liquid crystal display device according to claim 12, wherein the circuit board is provided with an exposure opening for exposing the part.