JPS5917535A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To improve the ease and reliability of positioning and assembling, by coupling a liquid crystal panel and a circuit substrate with a filmlike electrode connector by using a hot melt type adhesive agent, and supporting the coupled part with a support. CONSTITUTION:Members 61 having elasticity are disposed on both of the top and bottom surface of a support 6, and further members 62 having tackiness or adhesiveness on the surface thereof. The support 6 may be obtd. by adhering double-side coated tapes on the top and bottom surfaces of the rigid members 61. Both of the juncture between a liquid crystal panel 1 and a film-like connector 5, and the juncture between a circuit substrate 3 mounted with a driving element and the filmlike electrode connector 5 are surely held by the support 6 attached with the adhesive or tacky-adhesive agent, whereby the reliability of connection is improved and the deviation in the position of the panel 1 after assembling is prevented. It is also possible to maintain the spacing between the rear of the panel and the driving circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a liquid crystal display device. Specifically, the present invention relates to a liquid crystal display device in which a liquid crystal panel is integrated with a substrate on which a driving circuit is mounted.

Such liquid crystal display devices are used for displaying clocks and alphanumeric (hereinafter abbreviated as αN) displaying numbers and letters kW. Uninvented use of film electrode connector, LCD panel and circuit board? The present invention provides a liquid crystal display device that is connected, reliable, and easy to assemble.

Conventionally, conductive rubber has generally been used to connect a liquid crystal panel and a circuit board. However, conductive rubber is difficult to align. In order to make an electrical connection, the conductive rubber must be pressed down with a certain amount of force, and it is difficult to adjust the amount of force. Easy to use with uneven presser foot. Conductive rubber? The crushing force can also cause the circuit board to bend or damage its reliability. There were drawbacks such as.

An advantage of the present invention is to provide a liquid crystal display device that is easy to align and assemble.

Another object of the present invention is to provide a reliable liquid crystal display device. It is in the point of providing.

The liquid crystal display device of the present invention uses a film-like electrode connector, and the film-like electrode connector is bonded to a liquid crystal panel and a circuit board by heat and pressure bonding, and a hard member and a A support is arranged consisting of elastic bodies disposed on the upper and lower surfaces, and the support is formed of the film-like t.
All of the above objectives have been achieved by pressing at least 175 gold of the joint between the M connector and the liquid crystal panel, or the joint between the film electrode connector and the circuit board.

As a film electrode connector, JP-A-55-609
There is a connector disclosed in Japanese Patent No. 87.

The present invention is an entire liquid crystal display device that uses a connector made of aluminum and has excellent assemblability and reliability.

Hereinafter, the liquid crystal display device 1 of the present invention will be explained using the drawings.

FIG. 1 is a schematic diagram of a first embodiment of the liquid crystal display device of the present invention. The liquid crystal panel 1 is attached to the circuit board 3 by the holding frame 2.
A power supply and other simple signals are inputted from the outside to the terminals on the circuit board 5 and displayed on the liquid crystal panel 1 (for example, +gpsoN)'.

FIG. 2 shows a sectional view of the liquid crystal display device of the present invention, which is a first embodiment of the present invention shown in FIG. 1, and FIG. 3 shows an exploded view.

FIG. 29 The liquid crystal panel 1 shown in FIG. 3 consists of at least two substrates made of glass plates or plastic films, and a liquid crystal material sandwiched between them.
In the case of a twisted nematic type (hereinafter abbreviated as TN type), the upper and lower polarizing plates and the reversible plate are fixed to the substrate with a silicone-based or acrylic-based adhesive or adhesive.

The LCD panel 1 is a White Taylor guest host type (
In the case of the GH type (hereinafter abbreviated as GH type), a UV filter is attached to the upper surface of the liquid crystal panel 1, and a reflection plate is attached to the lower surface.

At least the liquid crystal panel 1 is driven and displayed on the circuit board 3. ■A drive element 4 such as C is mounted. Board 3
For example, a glass evo substrate, a paper evo substrate, a paper phenol substrate, or CC4 & (manufactured by Hitachi Chemical) is conveniently used. Gala Evo substrates have high reliability, such as having a high hardness, low heat shrinkage, and good environmental resistance. Paper evo substrates, paper phenol substrates, or 004 substrates are inexpensive. %
The manufacturing process for the 004 base is simple and the cost is low. The circuit board 3 needs to have a certain degree of hardness, and extremely soft materials such as flexible boards are generally not suitable. (ii) Since the connection between the liquid crystal panel 1 and the circuit board 3 is made by thermocompression bonding of the film-like electrode connector 5, compared to the case where conventional conductive rubber is used,
The hardness of the circuit board 3 is soft and good. On the circuit board 3, a metal pattern on the circuit board 3 is exposed to a pre-connection movement (hereinafter abbreviated as board connector section) 6 of the film-like electrode connector 5. The metal pattern is generally copper foil and has 3 to 2
Thickness of 0μm or less is better; ordinary copper foil is 39μm thick.
However, the circuit board 3 used in the uninvented liquid crystal display device
The thickness of the copper foil for the board connector portion 31 is within the range of 3 to 20 μm. A thin metal layer of 0.1 to 3 μm may be formed on the copper foil pattern by nickel plating, hammer plating, gold plating, gold flash, electroless gold plating, silver plating, silver flash, or electroless silver plating. In the case where such a thin metal layer is formed, the thickness of the metal pattern of the board connector portion 61 is within the range of 3 to 20 μm including the thin metal layer. By forming a thin metal layer on a metal pattern such as copper foil, the reliability of the electrical connection between the film electrode connector 5 and the circuit board &3 is improved due to rust prevention of the metal pattern. The electrical resistance of the connecting portion is reduced, and when driving the liquid crystal panel, there is no sag in the driving waveform due to the number of OR0 times, so there are advantages such as the same driving display characteristics as above. This is a great advantage when forming a thin metal on copper foil.In fields where reliability is particularly important, electrolytic gold plating is used, and when the terminals cannot be removed for electrolytic plating, electroless gold plating is used. It is best to use gold plating or gold flash. External terminals 32 are provided at the ends of the circuit board 3 for electrical connection to the outside. A connector may be connected to this. At the four ends of the circuit board 3,
A mounting hole 30, which is a through hole, is provided so that this liquid crystal display device can be mounted to all external devices.

The liquid crystal display device of the present invention, in which the holding frame 2 is also provided with the through holes 20, can be attached to the mounting holes 20 with bolts, nuts, screws, etc.
It is used by attaching it to an external device via 30.

The film-like electrode connector 5 electrically connects the circuit board 3 and the liquid crystal panel 1. The film-like 11-pole connector 5 is made by forming a lead part and a lead part on a polyester film having a thickness of 10 to 50 μm, for example. An insulating part is formed, at least the insulating part is made of hot melt adhesive, and the liquid crystal panel 1 and the circuit board 3 are connected to each other. Electrical and mechanical connections are made by thermocompression bonding. For the conductive pattern section, a bed of conductive powder such as silver powder, graphite powder, or carbon black is mixed into an epoxy, rubber, or thermoplastic adhesive, and screen printing is performed to create a redundant pattern. printed.

Examples of such adhesives include Spot Weld Sealer 163M manufactured by Cemetain KK and Conductive Adhesive E202 manufactured by Epotek. Further, an insulating hot-melt adhesive is formed between the conductive pattern parts by screen printing. An example of such an adhesive is "6500" manufactured by Cemedine KK. In addition, the conductive adhesive that forms the conductive pattern is
Conductive powder such as silver powder, graphite, carbon black, etc. may be completely mixed into a hot melt type adhesive such as "6500" so that the adhesive as a whole has both hot melt properties and conductivity. 1fc
, Is there any hot-melt property other than the terminal part of the film electrode connector 5? It may be coated or screen printed with an insulating adhesive or paint. This adhesive may be an epoxy or thermoplastic adhesive or paint, such as Cemedine KK's "1565" or "181".
There is. Other examples of such conductive adhesives, hot-melt wettable agents, insulating adhesives or coatings, and film 8-electrode connectors are described in detail in Japanese Patent Laid-Open No. 55-60987. The film-like electrode connector 5 disclosed in Japanese Patent Application Laid-Open No. 55-60987 is called "Heat Seal" (Japan Graphite KKfi). This film-like electrode connector is connected to a liquid crystal panel or a circuit board by heat and pressure, in an airtight and mechanical manner.The heat and pressure bonding conditions are, for example, 5 Kg/ct/I under pressure of 180 mm. ℃ for about 10 seconds is sufficient.

The support body 6 is made up of at least a hard member 60 and an elastic member 61 disposed on the upper and lower surfaces thereof. The hard member 60 is Bakelite, a synthetic wood piece, a natural wood piece, Tokilite, vinyl chloride, iron? It is made from a piece of metal such as aluminum, stainless steel, or copper. The elastic body may be sponge, silicone rubber, synthetic rubber, natural rubber, urethane foam, polyurethane foam, synthetic rubber foam, polyethylene foam, neoturen, or the like. Hard member 6o and elastic? The connection between the two members 61 is made using a commercially available adhesive or pressure-sensitive adhesive such as epoxy, rubber, polyurethane, or nitrile rubber.

The thickness is about 0.1 to 4 mm. The liquid crystal panel 1 maintains a distance between the liquid crystal panel 1 and the circuit board 3 by a support 60 and a hard member 60. There is a hard member 6 in the support 6.
Since 0 is placed, the gap between the liquid crystal panel 1 and the circuit board 5 is added to a certain value, and cannot be less than that value. The conductive pattern portion of the terminal connection portion of the film-like electrical connector 5 is mechanically attached to the adherend such as the liquid crystal panel 1 or the circuit board 3 using a hot-melt insulating adhesive formed outside the conductive pattern portion. If the elastic body 61 is connected to
11. is pressing the terminal part against the hot melt adhesive. In addition to adhesion, since the force exerted by the pressing force of the elastic body 61 acts, the reliability of the connection is improved both mechanically and electrically. Even if the film-like electrode connector 5 has a conductive hot-melt adhesive layer formed on the conductive pattern portion of the terminal connection portion, the mechanical and electrical connection cannot be achieved when the elastic body 61 is used to hold the film-like electrode connector 5. The reliability is the same as above. Since the elastic member 61 is formed on the upper and lower surfaces of the hard member 60 and constitutes the support body 6, the hard member 60 constituting the support body 6 does not directly contact the film-like electrode connector 5, and the hard member 60 There is no breakage or tearing of the connector due to edges, corners, etc. of the member 60.

An adhesive or adhesive member 62 may be formed on the surface of the elastic member 61. This includes acrylic, rubber,
Commercially available adhesives or adhesives such as thermoplastic plastics, epoxys, polyurethanes, nitrile rubbers, etc., or commercially available double-sided tapes may be used.

For example, Cemedine xK's l"54ooj"
501" etc.

Further, as the elastic body 61, a double-sided tape whose surface is coated with an adhesive or an adhesive may be used. Examples of this elastic member with an adhesive or pressure-sensitive adhesive formed on its surface include Nitto Hosei KK's double-sided adhesive tapes "A300J~"16
591".

These base materials include nonwoven fabrics, cloth, low foam polyurethane,
Foamed urethane, foamed urethane, foamed neorene, foamed soft polyethylene, foamed synthetic rubber, etc. are used, and synthetic resin-based or rubber-based adhesives are used as the adhesive, and the total thickness is 0.06 to 5. It is something. In this way, apply adhesive or adhesive Jf162 to at least one part of the upper and lower surfaces of support body B.
If this is formed, the support body 6 can reliably press the bonding portions of the liquid crystal panel 1 and the circuit board 3 with the film-like electrode connectors 5. Since the position of the support body 6 is fixed, the position of the liquid crystal panel 1 is fixed in the affected area.

The presser frame 2 is a thin metal plate with a thickness of 0.1 to 1.2
It is about 1. Materials include iron, copper, bronze, brass, stainless steel, and aluminum plates. Thin metal used for presser frame 2 &
The thickness of the material is one foot, and the remaining material after rolling, such as rolled steel plate, is the best material, and S+ iron material is the cheapest available.

When using iron materials, plating with nickel, chromium, etc. will have a rust-preventing effect. In addition, when stainless steel plates are used entirely, there are advantages such as being resistant to rust, easy to process, and strong. The presser frame 2 is thus made by forming a single metal plate into the desired shape using a press or the like, and then bending the metal plate.

Next, a method for assembling the liquid crystal display device of the present invention using such parts will be explained. 1. On the LCD panel 1,
The film-like electrode connector is heat-pressed using a 5-gehot press. Next, the external terminals of the film electrode connector 5 are connected to the circuit board 3 by hot pressing. Next, the elastic body 6 is installed under the terminal of the liquid crystal 13-panel 1. Next, the presser frame 2 is set from above the liquid crystal panel 1 so that the legs 23 enter the holes 33 of the circuit board 3. Next, the legs 23 of the holding frame 2 protruding from the back side of the hole 33 of the circuit board are twisted to fix the holding frame 2 and the liquid crystal panel 1 to the circuit board 3.

In addition, when assembling, if holes 20 and 30 are made for assembly in the presser frame 2 and the circuit board B, work efficiency will be improved.
〃) The alignment of the liquid crystal panel 1 is completed, and a liquid crystal display device with an improved appearance is assembled.

This is done when fixing the presser frame 2 to the circuit board 3.
A long and thin rod (hereinafter referred to as a bottle) is passed through the assembly hole 20 of the circuit board 3 and the assembly hole 30 of the circuit board 3, respectively, and the relative positions of the circuit board 3 and the holding frame 2 are adjusted using the bottle. Above hole 2
The positions of 0+30 and the bottle are such that the outer periphery of the liquid crystal panel 1 is exactly in contact with the hole 20°30 and the outer periphery of the bottle. Next, attach the liquid crystal panel 1 so that its outer circumference corresponds to the hole 20+50.
Move it so that it touches the outer periphery of the bottle inserted. Next, twist the legs 23 of the presser frame 2 to fix the liquid crystal panel 1 and the presser frame 2 to the circuit board 314-. . FIG. 4(a) is a plan view, and FIG. 4(b) is a sectional view. 51 is polyester, polyethylene,
This is a base film made of materials such as cellulose acetate. The thickness is 5 to 5 μmT; J:r. base film 5
1 has a conductive pattern on which a conductive member 52 is disposed, and an insulating part on which a hot-melt insulating adhesive 53 is disposed.The conductive member 52 itself also has hot-melt adhesive properties. You can leave it there.

FIG. 5 shows the film 1! used in the liquid crystal display device of the present invention. This is another embodiment of the polar connector 6.

FIG. 5 (Al is a plan view, (b) is a cross-sectional view. 51 is a base film made of a material such as polyester, polyethylene, cellulose acetate, etc. Base film 51
There is a conductive pattern section on which a conductive member 52 is disposed, and an insulating section on which a hot-melt insulating adhesive 53 is disposed, and an insulating member 54 is disposed outside the terminal section. .

The insulating member 54 does not have hot-melt properties and, for example, a thermosetting epoxy adhesive or a rubber adhesive is used. By arranging the insulating member 54 in this way, a film-like electrode connector 6 is strong and less likely to tear or break due to breakage, and there is no possibility of short-circuiting due to contact with the metal holding frame 2, etc.

FIG. 6 is a sectional view of a second embodiment of the inventive liquid crystal display device. On the upper surface of the support body B, an elastic member 61 is provided on a hard member 60, and a viscous member 62 is provided on the upper surface thereof. The support 6 may have the above-mentioned double-sided adhesive or double-sided adhesive tape pasted on its upper surface.

In this way, the terminal tube adhesive case connected to the film-like electrode connector 5 of the liquid crystal panel 1 or the support body 6 provided with the adhesive member can be reliably pressed, so that the liquid crystal panel 1 can be The reliability of the connection of the film-like polar connector 5 is the same as above.

FIG. 7 is a sectional view of a third embodiment of the liquid crystal display device of the present invention. An elastic member 61 is disposed on both the upper and lower surfaces of the support 6, and an adhesive or adhesive member 62 is disposed on the surface thereof. The support body 6 may have the above-mentioned double-sided tape attached to the upper and lower surfaces of the hard member 61.

In this way, both the connection part between the liquid crystal panel 1 and the film electrode connector 5, and the connection part between the circuit board 5 and the film electrode connector 5 are secured by the support 6 coated with the demulcent or adhesive. The reliability of the connection is the same as above. Furthermore, the position of the liquid crystal panel 1 is difficult to shift after assembly.

Configuring the liquid crystal display device of the present invention in this manner has the following advantages.

11) Attach the liquid crystal panel 1 to the film electrode connector 5.
The liquid crystal display device of the present invention is connected to the liquid crystal panel 1 and the circuit board 3 via a hot-melt adhesive. This increases the reliability of the connection both electrically and mechanically. In terms of electricity, since the conductive part of the film electrode connector 5 and the terminal part of the liquid crystal panel 1 or circuit board 3 are subjected to more pressure than the elastic body B, the electrical resistance of the connection part becomes smaller. The drivability of the liquid crystal panel 1 also has the same advantage as above.

Mechanically, it also prevents the film-like electrode connector 5 from peeling off from the liquid crystal panel 1 and circuit board 371).

(2) The support body 6 includes a hard member 60 and an elastic member 6
0, and the rigid member 60 prevents the gap between the liquid crystal panel 1 and the circuit board @3 from being less than 1 foot, so when standing up early or after assembly, the reflective plate of the liquid crystal panel does not touch the circuit board 3. The reflection plate will not be damaged by the driving element 4. Further, the liquid crystal panel 1 is connected to the hard member 6 of the support body 6.
It is securely fixed at a certain position at 0Vc.

(3) Due to the fc elastic bodies provided on the upper and lower surfaces of the support body 6,
When the support body 6 presses the film-like electrode connector 5, the hard member 60 of the support body does not directly contact the film-like electrode connector 5, so that the film-like electrode connector 5 is not cut or torn by the hard member 60. Also,
When an impact force or vibration is applied, the impact force and vibration are absorbed by the elastic support member 61, and therefore,
The liquid crystal panel 1 is not cracked or damaged. Therefore, the liquid crystal display device of the present invention has a structure that is strong against impact force and vibration.

(4) Since the liquid crystal panel 1 and the circuit board 5 are adhesively connected by the film electrode connector 5, the liquid crystal panel 1
The electrical connection between the circuit board 3 and the circuit board 3 is easy and reliable. Conductive rubber? However, in the liquid crystal display device of the present invention, the film-like electrode connector 5 is attached to the liquid crystal display by heating and compressing the film-like electrode connector 5 with a hot-melt adhesive. Since it is connected to the panel 1 and the circuit board 3, the workability is easy and reliable, and there is no misalignment of connections between the terminals, resulting in reliability and good workability.

(4) In the liquid crystal display device of the present invention, since the support having a hard member is provided between the circuit board @ 6 and the liquid crystal panel 1 by the presser frame 2, it is not conductive as in the case of using conductive rubber. Rubber? The circuit board 3 will not bend or bend due to the repulsive force of the crushing, and you can also choose a blade that is soft to the circuit board 3.

In this way, the uninvented liquid crystal display device provides a highly reliable liquid crystal display device, which allows the material of the circuit board 3 to be selected from a wide variety of materials with different properties, contributing to the development of industry. Dingi is also known as Dai.

[Brief explanation of the drawing]

FIG. 1 is a schematic view of the first embodiment of the liquid crystal display device of the present invention, FIG. 2 is a sectional view, and FIG. 3 is an exploded assembly view. Example 1. FIG. 5 shows a second embodiment of the film-like electrode connector. FIG. 6 shows a second embodiment of the inventive liquid crystal display device. FIG. 7 shows a third embodiment of the liquid crystal display device of the present invention. 1... Liquid crystal panel 2... Holding frame 3... Circuit board 5... Film electrode connector 6... Support body and above Applicant Hakushu Seiki Co., Ltd. Agent Patent Attorney Mogami Tsutomu 21- ) Figure 1, Figure 2 Ol Figure 4 Figure 5 Figure 6 Figure 7

Claims (3)

[Claims] (1) A liquid crystal display device comprising at least a liquid crystal bag, a circuit board on which a driving element for driving the liquid crystal bag is mounted, and a holding frame for fixing the liquid crystal panel to the circuit board. , the liquid crystal panel and the circuit board are electrically coupled using a film-like electrode connector based on a plastic film, and the film-like electrode connector is bonded to the liquid crystal panel and the circuit board by heating and crushing a hot-melt adhesive. Mechanically coupled to the circuit board, between the liquid crystal panel and the circuit board is a joint between the film electrode connector and the liquid crystal panel or a joint between the film electrode connector and the circuit board. A support body is arranged so as to suppress at least one force, the support body is composed of a hard member and an elastic member arranged on the upper and lower surfaces, and the support body supports the liquid crystal panel. Patented liquid crystal display device. (2) An adhesive member is arranged on at least one surface of the elastic member arranged on the upper and lower surfaces of the support, and the support is attached to the liquid crystal panel of the film-like L-pole connector via the adhesive member. 2. The liquid crystal display device according to claim 1, wherein the connecting portion of the film-like electrode connector is connected to at least one of the connecting portions of the film-like electrode connector and the circuit board. (3) The liquid crystal display device according to claim 1, wherein the elastic body is made of double-sided adhesive tape.