JPH11326904A - Liquid crystal module with electroluminescence - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reliability of a liquid crystal module by prolonging the life of EL(electroluminescence), to reduce the assembly man-hours, to lower the cost and to reduce electromagnetic and vibration noises. SOLUTION: This liquid crystal module 40A with EL integrally fits EL 30A on the side of a lower polarizing plate 10 as a back light of an LCD (liquid crystal module) 20 constituted by injecting and enclosing liquid crystal 8 between two sheets of upper and lower glass substrates 1 and 2 opposite to each other and mounting a driving IC on the glass substrates. In this case, the EL 30A is formed on a rigid insulating plate 32, the plate 32 and the lower glass substrate 2 of the LCD 20 are sealed hermetically by using a seal body 33 composed of a metal frame body 33a and a conductive adhesive sealant 33b to make it a united structure. Then, one or joined and united FPC(flexible printed circuit) cables which are branched for the EL and the driving IC for the liquid crystal are fitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal module with electroluminescence, which is provided with electroluminescence as a backlight in a liquid crystal module.

[0002]

2. Description of the Related Art In recent years, portable information processing apparatuses and the like which have been reduced in size have been used. In this type of device, a liquid crystal display device is generally used as a display device. LCD modules with ICs are installed in fax machines, mobile phones,
It is used for audio equipment, household products, and many other products. Electroluminescence (hereinafter abbreviated as EL) as a backlight for these liquid crystal modules
This structure illuminates the liquid crystal display of the liquid crystal module with this light emission.

FIGS. 11 to 15 show a conventional liquid crystal module with EL. FIG. 11 is a plan view of the liquid crystal module with EL, FIG. 12 is a side view of FIG. 11, and FIG.
14 is a cross-sectional view of EL of FIG. 11, and FIG. 15 is a plan view of the back surface side of FIG.

As shown in FIGS. 11 and 12, a liquid crystal module 40 with an EL is roughly
(FIG. 13) and EL30 (FIG. 14). EL30 on the back side as a backlight for the liquid crystal module 20
Is arranged. Liquid crystal module 2 by light emission of EL30
0 illuminates the LCD display. 11 and FIG. 12, an EL 30 incorporating an EL luminous body 30a is partially adhered (fixed on both sides in FIG. 11) to a lower glass substrate 2 of a liquid crystal module 20, which will be described later, with a sealant 31 such as a double-sided adhesive tape. Things. Then, it is connected to a driving device (inverter) (not shown) provided outside via a lead wire 29a.

Referring to FIG. 13, an outline of the structure of the liquid crystal module will be described. On the inner surface side of the transparent upper glass substrate 1 and the lower glass substrate 2 which are arranged to face each other,
A transparent upper display electrode 3 and a lower display electrode 4 are respectively formed. Further, an upper alignment film 5 and a lower alignment film 6 are provided thereon, and a liquid crystal material 8 is injected while being sealed with a sealing material 7. Further, an upper polarizer 9 and a lower polarizer 10 are provided on the upper surface of the upper glass substrate 1 and the lower surface of the lower glass substrate 2 to constitute a liquid crystal cell. A protruding frame portion 2a of either the upper glass substrate 1 or the lower glass substrate 2 (the lower glass substrate 2 in FIG. 9).
The conductive pattern 11 of the drive IC 12 is provided on the frame portion 2a, and the conductive pattern 11 is connected to the pattern of the upper display electrode 3 and the pattern of the lower display electrode 4. The driving IC 12 is provided on the conductive pattern 11 to form the liquid crystal module 20, and the FPC cable 13 or the heat seal is attached. The lead pattern of the upper display electrode 3 formed on the protruding portion 1a of the upper glass substrate 1 and the conductive pattern 11 of the IC 12 formed on the frame portion 2a of the lower glass substrate 2 are connected and conductive, and the upper display is performed. Electrode 3 and lower display electrode 4
When an AC voltage is applied to the liquid crystal material 8, the liquid crystal material 8 rises and a display appears.

On the other hand, an outline of the structure of the EL will be described with reference to FIGS. 14 and 15. That is, a transparent electrode 22, a light emitting layer 23, and a dielectric layer 2 are formed on a transparent and highly moisture-proof polyethylene terephthalate (PET) film 21.
4. Laminated with the back electrode 25, and further, a PET film 26
It is structured to cover with. The transparent electrode 22 and the back surface electrode 25 are provided with extraction patterns 22a and 25a at a part of the outer peripheral portion for applying a voltage, and terminals 27a and 27b are provided ahead of them. Note that an insulating portion 28 is provided below the lead pattern 25a of the back electrode 25 so as not to come into contact with the transparent electrode 22 when the lead pattern 25a is provided. Further, a driving device (inverter) (not shown) is provided separately from the EL 30 having the above structure, and the inverter and the terminals 27a and 27
7b is connected to a lead wire 29a connected by solder 29 or the like (FIG. 11). In the above structure, when the AC voltage is applied from the inverter to the transparent electrode 22 and the back electrode 25 via the lead wire 29a, the light emitting layer 23 emits light, and the liquid crystal module 20 provided thereon is illuminated. Is what you do.

[0007]

However, the above-mentioned prior art has the following problems.
That is, although a highly moisture-resistant PET film is used for the luminous layer of the EL, moisture penetrates the microscopic holes of the film over a long period of time, and the luminous body of the luminous layer is deteriorated, so that the lifetime of the EL is reduced Will be reduced.

Further, since lead wires are used for conduction between the EL and the driving device, the number of parts such as lead wires and metal terminals is increased, and soldering work of lead wires, mounting to equipment, wiring work, etc. The number of man-hours for the work increases and the cost is high.

[0009] In particular, since the soldering place is performed under the FPC cable, the work is difficult. Further, there is a problem that nerves are used for turning the lead wires.

[0010] Further, since the vibration sound of the EL and the vibration sound of the driving device are directly exposed, noise is generated.

There is another problem that effective measures against electromagnetic noise of EL are not taken.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to extend the life of an EL, improve reliability, reduce the number of assembly steps, reduce costs, and reduce electromagnetic noise and vibration noise. And a liquid crystal module with EL.

[0013]

In order to achieve the above object, a liquid crystal module with electroluminescence according to the present invention is provided with an upper polarizing plate on an upper glass substrate and a lower polarizing plate on a lower glass substrate. A liquid crystal is injected and sealed between two glass substrates, and a driving IC is mounted on the glass substrate.
As a backlight of a liquid crystal module having mounted thereon, in a liquid crystal module with electroluminescence in which electroluminescence is disposed on the lower polarizing plate side, the electroluminescence is formed on a rigid insulating plate, and the insulating plate and the liquid crystal module are formed. Wherein the lower glass substrate is hermetically sealed with a sealing body, and the liquid crystal module and the electroluminescence are integrated.

Further, the seal body is characterized by comprising a metal frame and a conductive adhesive sealant.

Further, a conductive pattern for voltage input of electroluminescence and a conductive pattern for ground output from a sealant are formed on the insulating plate.

Two terminals, a connection terminal portion formed with a terminal connected to a pattern of a drive IC of the liquid crystal module and a connection terminal portion formed with a terminal connected to a pattern of a driving device (inverter) for electroluminescence. The present invention is characterized in that it is provided with a single piece or a joined FPC cable branched into parts.

Further, a drive device (inverter) for electroluminescence is integrally attached to the extension of the insulating plate.

The extension of the insulating plate extends in the longitudinal direction of the liquid crystal cell, and an FPC for electroluminescence is connected to the extension.

The extension of the insulating plate extends in the lateral direction of the liquid crystal cell, and an FPC for electroluminescence is connected to the extension.

Further, a driving device (invar) for electroluminescence is integrally attached to the FPC cable.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a liquid crystal module with an EL according to the present invention will be described with reference to the drawings. 1 to 4 relate to a first embodiment of the present invention, and FIG.
FIG. 2 is a plan view of the liquid crystal module with L, and FIG.
3 is a perspective view of the seal body of FIG. 2, and FIG.
FIG. 2 is a sectional view taken along line BB of FIG. 1. In the drawings, the same members as those of the prior art are denoted by the same reference numerals.

1 and 2, in the structure of the EL-equipped liquid crystal module 40A, the description of the same parts as those of the above-described conventional structure will be omitted. Features that are different from the past
An EL 30A having an EL luminous body 30a formed on a rigid insulating plate 32 instead of a conventional PET film, is sealed and sealed on a lower glass substrate 2 of a liquid crystal module (LCD) 20 via a seal body 33. It is. As the rigid insulating plate 32, a highly rigid glass, ceramic plate, acrylic plate or the like having a certain thickness can be used.
Due to the rigidity, the vibration noise generated by the EL 30A can be regulated. In addition, a pattern of power input to the inverter 34 and the EL is formed on the extended portion 32a of the insulating plate 32 and the inverter 34 is mounted. Further, the driving IC 1 of the liquid crystal module 20
Connection terminal 35 formed with a terminal connected to the second pattern
a and two terminals 1a and 1b branched into two terminal portions of a connection terminal portion 35b which forms a terminal connected to the pattern of the inverter 34.
The FPC cables 35 are attached by crimping the respective terminal portions of the FPC cables 35 to the mating pattern. In the present embodiment, the driving IC of the LCD 20 is used.
12 is mounted on the lower surface side of the protruding portion 1a of the upper glass substrate 1.

In FIG. 3, a seal 33 is formed by applying a conductive adhesive seal 33b to the upper and lower surfaces of a metal frame 33a. The metal frame 33a is preferably made of a metal material having good conductivity, for example, an aluminum material, a copper material, or the like. By surrounding the EL30A with a metal frame 33a, the EL30
Electromagnetic waves generated from the A transparent electrode 22 and the back electrode 25 can be shielded. A known epoxy adhesive sealant may be used instead of the seal body 33. Further, the conductive sealant 33b is a conductive adhesive, and is preferably, for example, dootite prepared by coating silver powder or graphite powder. The sealing agent 33b serves to integrally bond the insulating plate 32, the metal frame 33a, and the lower glass substrate 2 of the LCD 20 constituting the EL 30A, and flows to the ground side with an earth pattern drawn from the sealing agent 33b. Play a role.

Referring to FIG. 4, an EL according to this embodiment is shown.
Will be described. The back electrode 25, the dielectric layer 24, the light emitting layer 23, and the transparent electrode 22 are laminated on the rigid insulating plate 32 described above, and are covered with the transparent PET film 21. The transparent PET film 21 is not always necessary, and if it is present, it is effective in enhancing the moisture-proof effect. The lead pattern 25a of the back electrode 25 and the lead pattern 22a of the transparent electrode 22 are formed by extending toward the extension 32a of the insulating plate 32. The conductive pattern of the inverter 34 is also formed by being connected to the lead pattern. And
The inverter 34 is mounted on the pattern of the inverter 34. In addition, the extraction pattern 2 of the transparent electrode 22
In forming 2a, an insulating portion 28 is provided thereunder so as not to contact the back surface electrode 25.

The insulating plate 32 on which the EL 30A having the above structure is formed and the lower glass substrate 2 constituting the LCD 20 are bonded in a vacuum state by the seal body 33. As described above, the seal body 33 is composed of the conductive metal frame 33a and the conductive sealant 33b applied to the upper and lower surfaces thereof,
The sealing plate 33a and the metal frame 33a are
And the lower glass substrate 2 of the LCD 20 are integrally bonded. At the same time, a draw-out pattern is formed from a part of the sealant 33b and is connected to the ground portion of the inverter 34. The lead pattern 22a of the transparent electrode 22 of the EL 30A and the lead pattern 25a of the back electrode 25 are provided.
In order to prevent electrical continuity, a portion is bonded with an insulating portion 36 interposed therebetween.

Here, the back electrode 25, the dielectric layer 24, the light emitting layer 23, and the transparent electrode 2 constituting the EL 30A described above.
The method for forming the extraction pattern 2, the transparent electrode 22, and the PET film 21 will be described.

First, the back electrode 25 is formed by coating ITO powder obtained by doping indium oxide with tin into a paint and screen-printing it on an insulating plate 32 (a glass plate in this embodiment) made of a glass plate. Form. At this time, the extraction pattern 25a of the back electrode 25 and the ground pattern,
The conductive pattern of the inverter 34 is also formed at the same time.

Next, the dielectric layer 24 is formed by screen printing with a paint in which barium oxide titanium is dispersed and blended.
The dielectric layer 24 serves to protect the light emitting layer 23 from electrical breakdown and to function as a reflector for reflecting light.

Next, the luminous layer 23 is formed by adding a trace amount of an inactivating agent of a metal or a halogen element to a phosphor of zinc sulfide to form a paint, and is formed by screen printing.

Next, the extraction pattern 22 of the transparent electrode 22
An insulating portion 28 is formed in the portion where a is to be formed. The insulating portion 28 is formed by screen-printing a fluororesin paint. In particular, the resin is not limited to a fluororesin, but is preferably a resin having excellent moisture resistance.

Next, the transparent electrode 22 is formed in the same manner as the back surface electrode 25, by forming an ITO powder into a paint and screen printing. At this time, the lead pattern 22a of the transparent electrode 22 is also printed and formed at the same time.

Next, the transparent PET film 21 is covered from above and fixed by thermocompression bonding or bonding.

In the present embodiment, the lead pattern of the transparent electrode 22 and the back electrode 25 and the pattern for the inverter are formed by coating the ITO powder with a paint, but may be formed by a silver paste having good conductivity. Things. The inverter 34 may be directly soldered and fixed to the formed pattern, or may be provided with a gold coating film on the pattern and fixed thereon to improve conductivity.

Next, as described above, the EL 30A and the LCD 20 are integrated by applying a conductive sealing agent 33b such as dootite on the upper and lower surfaces of a metal frame 33a made of a metal having good conductivity such as aluminum. The seal body 33 thus formed is sandwiched between the insulating plate 32 of the EL 30A and the lower glass substrate 2 of the LCD 20 and pressed together to be integrally bonded. Before the pressure contact, a part of the lead pattern 22a of the transparent electrode 22 and the lead pattern 25a of the back electrode 25 formed on the insulating plate 32, that is, an insulating portion 36 made of a fluororesin paint at a position where the sealing agent 33b is applied. Is formed by printing, and then the sheet is adhered with the seal body 33 interposed therebetween. Finally, a connection terminal portion 35a (FIG. 1) formed with a terminal connected to the pattern of the drive IC 12 of the LCD 20 and a connection terminal portion 35b (FIG. 1) formed by turning a part to form a terminal connected to the pattern of the inverter 34. 2)
By crimping each terminal portion of one FPC cable 35 branched into one terminal to a mating pattern,
35 is attached.

FIGS. 5 and 6 relate to a second embodiment of the present invention. FIG. 5 is a plan view of an LCD with an EL.
FIG. 6 is a sectional view taken along line CC of FIG. 5.

The difference from the first embodiment is that
The inverter 34 is mounted on the FPC cable 35. Therefore, the pattern for mounting the inverter 34 is not formed on the insulating plate 32 of the EL 30A,
Only a pattern for connection to the PC cable 35 is formed. The driving IC 12 of the LCD 20
Is mounted on the upper surface of the lower glass substrate 2. The rest is the same as in the first embodiment, and a description thereof will be omitted.

FIGS. 7 and 8 relate to a third embodiment of the present invention. FIG. 7 is a plan view of an LCD with an EL.
FIG. 8 is a sectional view taken along line DD of FIG. 7.

In the above-described first embodiment, the mounting position of the inverter 34 is the extension 32a of the insulating plate 32 extending in the longitudinal direction of the liquid crystal cell. Insulating plate 3 extending in the same direction as the direction
2 and the FPC 35 is attached to the LCD 20.
LCD drive IC cable 3 having a connection terminal portion 35a formed with a terminal connected to the pattern of the drive IC 12 of FIG.
5A and an EL cable 35B having a terminal 35b formed with a terminal connected to the pattern of the inverter 34.
Are joined together at the joint 35c to form a PFC.
35 are connected to the mating pattern by an anisotropic conductive film (AC
F) FPC integrated by pressing with 37
35 is attached. In the present embodiment, the LCD 20
Is an upper glass type mounted on the lower surface side of the protruding portion 1a of the upper glass substrate 1. Others are the first
The description is omitted because it is the same as that of the embodiment.

9 and 10 relate to a fourth embodiment of the present invention. FIG. 9 is a plan view of a liquid crystal module with an EL, and FIG. 10 is a sectional view taken along line EE of FIG.

The difference from the third embodiment is that
The drive IC 12 of the LCD 20 is provided with the protrusion 2 of the lower glass substrate 2.
It is a lower glass type mounted on the upper surface side of a. In other respects, a cable 35A for the LCD driving IC and a cable 35B for the EL are provided in the same manner as in the third embodiment, and finally the cable 35B for the EL is connected to the driving IC for the LCD. An FPC 35 is formed by joining two of the cables 35A at a joint 35c. FIG.
As shown in (5), the end of the EL cable 35B is inverted and attached to the extension 32b of the insulating plate 32 by crimping with an ACF 37 or the like.

[0041]

As described above, since the EL is hermetically sealed with the rigid insulating plate (eg, glass) and the lower glass substrate of the LCD via the sealing member, the moisture resistance is dramatically improved, and the EL is improved. Extend the life of the device.

In addition, because of the integral structure, especially when the FPC or the heat sheet is attached to the device, the connecting portion is one.
Since the connection between the LCD and the EL is completed at three locations, the handling of parts and the assembling into the equipment become easy, the number of assembling steps and the like are reduced, and the cost is reduced.

Since the EL and the inverter are fixed to a rigid insulating plate (glass), the vibration noise generated from the EL and the inverter is regulated by the glass, and the vibration noise (sound noise) is reduced.

Since the EL is surrounded by a metal frame, electromagnetic noise is reduced. And so on.

[Brief description of the drawings]

FIG. 1 is a plan view of a liquid crystal module with EL in which an inverter is mounted on an insulating plate according to a first embodiment of the present invention.

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

FIG. 3 is a perspective view of the seal body of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 1;

FIG. 5 is a plan view of a liquid crystal module with an EL in which an inverter is mounted on an FPC cable according to a second embodiment of the present invention.

FIG. 6 is a sectional view taken along line CC of FIG. 5;

FIG. 7 is a plan view of a liquid crystal module with EL in which an inverter is mounted on an insulating plate according to a third embodiment of the present invention.

FIG. 8 is a sectional view taken along line DD of FIG. 7;

FIG. 9 is a plan view of a liquid crystal module with EL in which an inverter is mounted on an insulating plate according to a fourth embodiment of the present invention.

FIG. 10 is a sectional view taken along line EE of FIG. 9;

FIG. 11 is a plan view of a conventional liquid crystal module with EL.

FIG. 12 is a side view of FIG. 11;

FIG. 13 is a sectional view of a conventional liquid crystal module.

FIG. 14 is a cross-sectional view of a conventional EL.

FIG. 15 is a plan view of the back side of FIG. 10;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 upper glass substrate 2 lower glass substrate 7 sealing material 8 liquid crystal material 9 upper polarizing plate 10 lower polarizing plate 11 conductive pattern of drive IC 12 drive IC 20 liquid crystal module 21 PET film 22 transparent electrode 23 light emitting layer 24 dielectric layer 25 Back electrode 28, 36 Insulating part 30A EL 32 Insulating plate 32a, 32b Insulating plate extension 33 Sealing body 33a Metal frame 33b Sealing agent 34 Inverter 35 FPC cable 35a Connection terminal part to be connected to drive IC pattern 35b Inverter Connection terminal part to be connected to the pattern 35c Joint part 35A Cable for LCD drive IC 35B Cable for EL 40A Liquid crystal module with EL

Claims (8)

[Claims] A liquid crystal is injected and sealed between two opposing glass substrates having an upper polarizing plate on the upper glass substrate side and a lower polarizing plate on the lower glass substrate side, and a driving IC is provided on the glass substrate.
As a backlight of a liquid crystal module having mounted thereon, in a liquid crystal module with electroluminescence in which electroluminescence is disposed on the lower polarizing plate side, the electroluminescence is formed on a rigid insulating plate, and the insulating plate and the liquid crystal module are formed. A liquid crystal module with electroluminescence, wherein the lower glass substrate is hermetically sealed with a sealing body, and the liquid crystal module and electroluminescence are integrated. 2. The liquid crystal module with electroluminescence according to claim 1, wherein the seal body is formed of a metal frame and a conductive adhesive sealant. 3. A conductive pattern for voltage input of electroluminescence and a conductive pattern for ground output from a sealant are formed on the insulating plate.
A liquid crystal module with electroluminescence according to the above. 4. A connection terminal portion having a terminal connected to a pattern of a drive IC of the liquid crystal module and a connection terminal portion having a terminal connected to a pattern of a drive device (inverter) for electroluminescence. 2. The liquid crystal module with electroluminescence according to claim 1, further comprising a flexible printed circuit (hereinafter abbreviated as "FPC") cable, which is branched into one part or joined and integrated. 5. The liquid crystal module with electroluminescence according to claim 1, wherein an electroluminescence driving device (inverter) is integrally attached to the extension of the insulating plate. 6. The liquid crystal module with electroluminescence according to claim 5, wherein an extension of the insulating plate is in a longitudinal direction of the liquid crystal cell, and an FPC for electroluminescence is connected to the extension. 7. The liquid crystal module with electroluminescence according to claim 5, wherein the extension of the insulating plate is in the lateral direction of the liquid crystal cell, and an FPC for electroluminescence is connected to the extension. . 8. The liquid crystal module with electroluminescence according to claim 1, wherein a driving device (inverter) for electroluminescence is integrally attached to the FPC cable.