JPH10288771A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a liquid crystal display device thin in thickness by improving the arrangement of a circuit board. SOLUTION: In this liquid crystal display device provided with a liquid crystal panel 2, a circuit board 3 arranged on the side of the panel 2, plural circuit elements 4 for driving liquid crystal connected between the panel 2 and the board 3, and a reinforcing plate 6 arranged between the panel 2 and the board 3, one end part of the plate 6 is arranged on the back side of the connecting part between the panel 2 and the element 4, and another end part 62 (63) of the plate 6 is arranged between the elements 4 on the upper surface of the board 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a liquid crystal display device suitable for thinning.

[0002]

2. Description of the Related Art A conventional liquid crystal display device is disclosed in
As shown in JP-A-318933 (see FIG. 2 (b)) and the like, a thick cushion member is provided between the upper surface of the upper glass of the liquid crystal panel and the outer case to protect the liquid crystal panel. Is arranged, there is a gap of about 1 to 3 mm between the liquid crystal panel and the outer case. However, at present, the thickness of the liquid crystal display device is required to be reduced in units of 0.1 mm, and an attempt has been made to make the above-mentioned interval almost zero. As described above, as the distance between the liquid crystal panel and the outer case becomes shorter, the distance between the circuit board and the outer case arranged on the side of the liquid crystal panel becomes shorter. In particular, TAB, TCP
When a circuit element for driving a liquid crystal called a liquid crystal driving device is arranged, there is a problem that the thick IC portion hits the outer case.

In order to solve this problem, an outer case I
It is conceivable that an opening is provided in a portion corresponding to C and the upper part of the IC is positioned in the opening.

However, if an opening is provided in the outer case corresponding to the IC, there is a possibility that dust may enter the inside through the opening. To prevent this, it is preferable to attach a film covering this opening to the case. Affixing films individually to each opening is not preferable because it leads to an increase in work processes. An insulating film may be provided so as to cover a circuit board or a circuit element for driving a liquid crystal. The insulating film may be attached to the back side of the outer case to cover each of the openings. However, there arises a problem that this is inhibited by the insulating film.

[0005]

SUMMARY OF THE INVENTION Therefore, the main object of the present invention is to reduce the thickness of a liquid crystal display device by devising the arrangement of circuit boards. Another object of the present invention is to protect a liquid crystal driving circuit element when reducing the thickness. Another object is to reduce the thickness of a liquid crystal display device by effectively using parts constituting the liquid crystal display device. Another object is to prevent dust from entering the device even when the device is thinned.

[0006]

A liquid crystal display device according to the present invention comprises a liquid crystal panel, a circuit board disposed on a side of the liquid crystal panel, and a plurality of liquid crystal driving devices connected between the liquid crystal panel and the circuit board. In a liquid crystal display device including a circuit element and a reinforcing plate disposed between the liquid crystal panel and the circuit board, one end of the reinforcing plate is disposed on a back side of a connection portion between the liquid crystal panel and a liquid crystal driving circuit element. The other end of the reinforcing plate is disposed between the liquid crystal driving circuit elements on the upper surface of the circuit board.

A liquid crystal display device according to the present invention comprises: a liquid crystal panel;
A circuit board disposed on a side of the liquid crystal panel; a circuit element for driving a liquid crystal connected between the liquid crystal panel and the circuit board; and a reinforcing plate disposed between the liquid crystal panel and the circuit board. In a liquid crystal display device in which a driving circuit element is arranged to be inclined at a predetermined angle with respect to the circuit board, an end of the reinforcing plate is provided at a gap formed between the liquid crystal driving circuit element and the circuit board due to the predetermined angle of inclination. Are arranged.

A liquid crystal display device according to the present invention comprises: a liquid crystal panel;
A circuit board disposed on the side of the liquid crystal panel, a liquid crystal driving circuit element connected between the liquid crystal panel and the circuit board, a display opening for exposing a display area of the liquid crystal panel, and the liquid crystal driving circuit element A liquid crystal display device having an opening for parts corresponding to the IC part of the above, and comprising an outer case covering the liquid crystal panel, the circuit board, and the front side of the circuit element for driving the liquid crystal. An insulating film is attached so as to cover the substrate and the liquid crystal driving circuit element, and a part of the insulating film is cut to cover the component opening and move in the component opening direction. A possible covering piece is formed.

A liquid crystal display device according to the present invention comprises: a liquid crystal panel;
A circuit board disposed on the side of the liquid crystal panel, a liquid crystal driving circuit element connected between the liquid crystal panel and the circuit board, a display opening for exposing a display area of the liquid crystal panel, and the liquid crystal driving circuit element A liquid crystal panel, the circuit board, and an outer case for covering a front side of the liquid crystal driving circuit element, and an IC case of the liquid crystal driving circuit element for the component. In a liquid crystal display device arranged to face the opening, an insulating film is attached to the back side of the outer case so as to cover the circuit board and the liquid crystal driving circuit element, and the insulating film is partially adhered to the insulating film. A notch is formed to cover the component opening and form a cover piece that is movable in the component opening direction by contact with the IC portion. To.

[0010] The surface of the insulating film that is in contact with the outer case may be an adhesive surface, and the cover piece may be a non-adhesive surface.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a plan view of a main part of the liquid crystal display device 1, FIG. 2 is a cross-sectional view taken along AA of FIG. 1, FIG. 3 is a plan view corresponding to FIG. 1 in a state where an outer case 5 and an insulating film 7 are removed,
4A and 4B are plan views of components, FIG. 4A is a plan view of a reinforcing plate, FIG. 4B is a plan view showing another configuration of the reinforcing plate,
FIG. 3C is a plan view of the insulating film.

As shown in FIG. 2, the liquid crystal display device 1 according to the present embodiment comprises a liquid crystal panel 2, a circuit board 3 arranged on the side of the liquid crystal panel 2 substantially in parallel with the liquid crystal panel 2, and A liquid crystal driving circuit element 4 connected between the liquid crystal panel 2 and the circuit board 3; an outer case 5 covering the liquid crystal panel 2, the circuit board 3 and the front side of the liquid crystal driving circuit element 4; A reinforcement plate 6 is provided between the liquid crystal panel 2 and the circuit board 3 to hold the panel at a lower position than the panel 2.

In the liquid crystal panel 2, liquid crystal is sealed between upper and lower transparent substrates 21 and 22 having transparent electrodes on opposing surfaces, and a polarizing plate, a phase difference plate or the like is sandwiched between the transparent substrates 21 and 22. Are arranged and arranged.
An external connection terminal 25 connected to an internal transparent electrode is provided on a side of the lower transparent substrate 22 facing the circuit board 3. One end of the liquid crystal drive circuit element 4 is connected to the external connection terminal 25. The connection is made via a conductive adhesive.

The circuit board 3 is formed of a relatively rigid and long printed board, and the other end of the liquid crystal driving circuit element 4 is connected to the upper surface thereof by a conductive member such as solder. If the circuit board 3 is arranged on the same plane as the liquid crystal panel 2, it is difficult to arrange thick components due to the restriction by the distance to the outer case 5, so that the circuit board 3 is lower than the liquid crystal panel with less height regulation. To use the space of
It is arranged at a lower position than the liquid crystal panel 2, and its position is determined by the reinforcing plate 6.

The liquid crystal driving circuit element 4 has a structure called TAB, TCP or the like in which a base film is provided with a liquid crystal driving IC 41. The IC 41 and the conductive pattern are protected by an insulating resin 42. ing. The liquid crystal driving circuit element 4 includes the liquid crystal panel 2 and the circuit board 3.
Are disposed at predetermined intervals therebetween, and both end portions thereof are connected to the liquid crystal panel 2 and the circuit board 3 as described above. The connection portions are provided with a moisture-resistant protective resin (see FIG. (Not shown) is applied. Further, since the upper surface of the circuit board 3 is at a lower position than the external connection terminal 25 of the liquid crystal panel 2, the liquid crystal driving circuit element 4 is arranged to be inclined at a predetermined angle with respect to the circuit board 3. As a result, the circuit board 3
A gap 43 is formed between the liquid crystal panel 2 and the external connection terminal portion 25, and the gap 43 increases in distance toward the liquid crystal panel 2.
When the range in which the gap 43 is formed is widened, a force for bending the liquid crystal driving circuit element 4 downward is likely to be applied, and thereby unnecessary stress is easily applied to the IC 41. Since the gap 43 is gradually widened, when a protective resin is applied to a connection portion between the circuit board 3 and the circuit element 4 for liquid driving, the resin may enter the gap 43 over a wide area by a capillary phenomenon. It acts to prevent

The outer case 5 is made of a rigid metal such as an iron plate, and corresponds to the display opening 51 for exposing the display area of the liquid crystal panel 2 and the circuit element 4 for driving the liquid crystal, particularly the IC 41 thereof. Component Openings 52 Formed
Is formed. The component opening 52 is provided when the distance between the circuit board 3 and the outer case 5 is made shorter than the height of the IC 41 portion of the liquid crystal driving circuit element 4 as the device becomes thinner. It is provided to allow a part.

The reinforcing plate 6 is made of a rigid synthetic resin, metal, or the like, and has a stepped cross section so that one end 61 on the liquid crystal panel 2 side and the other end 62 on the circuit board 3 side have a predetermined step. Has formed. One end 61 of the reinforcing plate 6
Is fixed to the back side of the external connection terminal portion 25 of the liquid crystal panel 2 using an adhesive 61a such as a double-sided adhesive so as not to hinder display. The other end 62 of the reinforcing plate 6 is disposed on the upper surface of one end of the circuit board 3 so as to be located in the gap 43 formed between the circuit board 3 and the liquid crystal driving circuit element 4. The other end 62 is connected to the liquid crystal driving circuit element 4.
The liquid crystal driving circuit element 4 is supported by contacting the rear surface of the liquid crystal driving element 4 and acts to reduce the stress applied to the liquid crystal driving circuit element 4 downward.

As shown in FIG. 4A, a plurality of supporting pieces 63 are formed at the other end 62 of the reinforcing plate 6 at intervals slightly longer than the length of the liquid crystal driving circuit element 4. Since the support pieces 63 are located between the liquid crystal driving circuit elements 4, the upward movement of the circuit board 3 can be restricted over a wide area. When the reinforcing plate 6 is fixed to the circuit board 3, the support piece 63 may function as a fixing portion of the reinforcing plate 6, so that both can be fixed without being obstructed by the liquid crystal driving circuit element 4. it can. Reinforcement plate 6
Is formed of a tin-plated iron plate or a metal that is easily solderable such as a copper plate, a copper foil pattern of a predetermined shape is formed on the upper surface of the circuit board 3 corresponding to the concave portion 64 of the support piece 63 and also serves as a mark for positioning. If such a method is formed, fixing with solder can be easily performed. When the reinforcing plate 6 is made of a synthetic resin and is fixed to the circuit board 3, the support pieces 63 can be fixed using an adhesive such as a double-sided adhesive.

When the reinforcing plate 6 is fixed to the circuit board 3,
Although it can be fixed to the back side of the circuit board 3, the back side of the circuit board 3 is hardly restricted by the height dimension of the arranged components,
Since the frequency of use is higher than that of the front side, it is preferable to dispose the reinforcing plate on the front side with a low use frequency in order to effectively use the limited area.

The circuit board 3 and the liquid crystal driving circuit element 4
In the case where it is not necessary to dispose the reinforcing plate 6 in the gap 43 between them, the configuration of the reinforcing plate 6 can be changed as shown in FIG. That is, the other end 62 to be disposed on the upper surface of the circuit board 3 is made only of the support piece 63, and the plurality of support pieces 63 are located between the liquid crystal driving circuit elements 4, and the support piece 63 is used only for the support piece 63. The structure of the reinforcing plate 6 can be changed so as to restrict the upward movement. As described above, if the plurality of supporting pieces 63 are located between the liquid crystal driving circuit elements 4, the space between the liquid crystal driving circuit elements 4 can be effectively used for the arrangement of the reinforcing plate 6, and the device can be effectively used. Can be prevented from increasing in thickness.

When the case 5 is made of metal, the circuit board 3 and the liquid crystal driving circuit element 4
In order to electrically insulate the circuit board 3 and the like, a long electrically insulating and flexible film 7 is attached so as to cover the circuit board 3 and the circuit element 4 for driving liquid crystal. As shown in FIG. 4 (c), the film 7 also has a function of preventing the intrusion of dust from the component opening 52, and a position corresponding to the component opening 52 formed in the outer case 5, as shown in FIG. In addition, a notch 71 is provided around the periphery, so that the component opening 52 is formed.
Cover piece 7 having an area equal to or slightly larger than component opening 52
2 are integrally formed. One surface of the film 7 is coated with an adhesive to form an adhesive surface 73.
The non-adhesive surface 7 to which the adhesive is not applied is used to allow the cover piece 72 to move when the IC is received.
It is set to 4.

In FIG. 2, reference numeral 8 denotes a connector terminal portion mounted on the back side of the circuit board 3, reference numeral 9 denotes a middle frame for supporting the liquid crystal panel 2, reference numeral 10 denotes a backlight device disposed on the back side of the liquid crystal panel 2, and reference numeral 11 denotes a liquid crystal display. The back plate covers the back surface of the device 1.

In assembling the liquid crystal display device 1 described above, the liquid crystal panel 2 is connected to each of the liquid crystal driving circuit elements 4, and then,
The liquid crystal panel 2 and the reinforcing plate 6 are fixed. In the case where the reinforcing plate 6 and the circuit board 3 are not fixed, the liquid crystal driving circuit element 4 is maintained in a state where the circuit board 3 is positioned by the reinforcing plate 6.
And the circuit board 3 are connected. When the reinforcing plate 6 and the circuit board 3 are fixed, the liquid crystal driving circuit element 4 and the circuit board 3 are connected after the positioning and fixing of the reinforcing plate 6 and the circuit board 3 are performed. A protective resin is applied to the connection between the liquid crystal driving circuit element 4 and the liquid crystal panel 2 and the circuit board 3 as necessary. The assembly of the liquid crystal panel 2 with the circuit board and the liquid crystal driving circuit element (not shown) is also performed in parallel. These assemblies are assembled into a middle frame 9, a backlight device 10, a back plate 11,
The liquid crystal display device 1 is assembled by assembling with the outer case 5 and the like to which the film 7 has been attached in advance.

As described above, since the reinforcing plate 6 having a step-like cross section for restricting the upward movement of the circuit board 3 is provided, the positioning of the circuit board 3 can be performed more reliably. Liquid crystal panel 2 that is less susceptible to height restrictions
The liquid crystal display device 1 can be made thinner by arranging the liquid crystal display device at a lower position than the above. If the end 62 of the reinforcing plate is arranged in the gap 43 between the circuit board 3 and the circuit element 4 for driving the liquid crystal, the force applied downward to the circuit element 4 for driving the liquid crystal (the component opening 52 Is provided, this opening 52
When the external case 5 is not provided with the component opening 52, the external force through the external case 5 or when a large amount of the protective resin flows into the gap 43. The force applied to the liquid crystal driving circuit element 4 can be reduced by effectively utilizing the reinforcing plate 6 to receive the force applied by the contraction of the resin.

When the assembly is completed, the IC 41 of the liquid crystal driving circuit element 4 is connected to the component opening 5 of the outer case 5.
2, but is partially inserted into
Is provided with a non-adhesive and movable covering piece 72 at a portion corresponding to the opening 52, so that the covering piece 72 can be easily deformed along with the arrangement of the IC 41. The opening 52 can be covered without giving unnecessary stress to the opening 52.

[0026]

As described above, according to the present invention, the circuit board is positioned by the reinforcing plate, and the circuit board can be arranged at a lower position than the liquid crystal panel which is hardly restricted in height. The thickness can be reduced. By arranging the reinforcing plate between the liquid crystal driving circuit elements, it is possible to effectively use the empty space.

If the reinforcing plate is disposed in the gap between the circuit board and the liquid crystal driving circuit element, the force applied downward to the liquid crystal driving circuit element is received effectively by using the reinforcing plate, and the liquid crystal driving circuit element is received. Stress applied to the circuit element can be reduced.

When the IC portion of the liquid crystal driving circuit element is positioned so as to be partially inserted into the component opening of the outer case, the circuit board and the insulating film of the liquid crystal driving circuit element are effectively used to make the non-conductive part. By providing the sticky and movable cover piece, the cover piece can cover the component opening of the outer case without applying unnecessary stress to the IC of the liquid crystal drive circuit element.

As a result, the thickness of the liquid crystal display device can be reduced. In addition, the circuit element for driving the liquid crystal can be protected even when the thickness is reduced. In addition, it is possible to effectively use components constituting the liquid crystal display device to reduce the thickness and prevent dust from entering the device.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view corresponding to FIG. 1 with an outer case 5 and an insulating film 7 removed.

FIGS. 4A and 4B are plan views of components, FIG. 4A is a plan view of a reinforcing plate, FIG. 4B is a plan view showing another configuration of the reinforcing plate, and FIG.
FIG. 3 is a plan view of an insulating film.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 2 Liquid crystal panel 25 External connection terminal part 3 Circuit board 4 Liquid crystal drive circuit element 41 IC 43 Gap 5 Outer case 52 Component opening 6 Reinforcement plate 61 One end 62 Other end 63 Supporting piece 7 Insulating film 71 Notch 72 Cover piece 73 Adhesive surface 74 Non-adhesive surface 8 Connector terminal part 9 Middle frame 10 Backlight device 11 Back plate

Claims (5)

[Claims] 1. A liquid crystal panel, a circuit board disposed on a side of the liquid crystal panel, a plurality of liquid crystal driving circuit elements connected between the liquid crystal panel and the circuit board, and a liquid crystal panel between the liquid crystal panel and the circuit board. A liquid crystal display device comprising a reinforcing plate disposed on a side of the circuit board, wherein one end of the reinforcing plate is disposed behind a connection portion between the liquid crystal panel and a circuit element for driving liquid crystal, and the other end of the reinforcing plate is connected to the circuit board. A liquid crystal display device characterized by being disposed between a liquid crystal driving circuit element on an upper surface and a liquid crystal driving circuit element. 2. A liquid crystal panel, a circuit board disposed on a side of the liquid crystal panel, a liquid crystal driving circuit element connected between the liquid crystal panel and the circuit board, and a liquid crystal driving circuit element disposed between the liquid crystal panel and the circuit board. A liquid crystal display device having a liquid crystal driving circuit element disposed at a predetermined angle with respect to the circuit board, wherein the liquid crystal driving circuit element and the circuit board are caused by the predetermined angle inclination. A liquid crystal display device, wherein an end of the reinforcing plate is disposed in a gap. 3. A liquid crystal panel, a circuit board disposed on a side of the liquid crystal panel, a liquid crystal driving circuit element connected between the liquid crystal panel and the circuit board, and a display for exposing a display area of the liquid crystal panel. A liquid crystal display device comprising: a liquid crystal panel, the circuit board, and an outer case that covers a front side of the liquid crystal driving circuit element, the liquid crystal display device having a component opening corresponding to an IC portion of the liquid crystal driving circuit element. Attaching an insulating film to the back side of the outer case so as to cover the circuit board and the liquid crystal driving circuit element,
A liquid crystal display device, wherein a cut piece is cut into a part of the insulating film to cover the component opening and to be movable in the component opening direction. 4. A liquid crystal panel, a circuit board disposed on a side of the liquid crystal panel, a circuit element for driving a liquid crystal connected between the liquid crystal panel and the circuit board, and a display for exposing a display area of the liquid crystal panel. A liquid crystal panel, the circuit board, and an outer case that covers a front side of the liquid crystal driving circuit element. Circuit element I
In a liquid crystal display device in which part C is arranged to face the opening for a component, an insulating film is attached to the back side of the outer case so as to cover the circuit board and the circuit element for driving the liquid crystal, and the insulating film A liquid crystal, characterized by forming a notch in a part thereof to cover the opening for the component and to be movable in the direction of the opening for the component by contact with the IC portion. Display device. 5. The liquid crystal display device according to claim 3, wherein the insulating film has a surface in contact with the outer case as an adhesive surface, and the cover piece has a non-adhesive surface.