JPH10311974A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the liquid crystal display device which is small-sized and thin by securely and efficiently holding an LCD(liquid crystal display) cell by a holder. SOLUTION: The LCD cell equipped with 1st and 2nd glass substrates 26 and 28 arranged opposite each other across liquid crystal and polarizing plates 42 and 44 provided on the external surface sides of the 1st and 2nd glass substrates 26 and 28 is held by the holder 20 of the liquid crystal display device by using an upper receiving plate 54. The upper receiving plate 54 is almost as thick as the polarizing plate 33 and in an end area on the external surface of the 2nd glass substrate 28 arranged on the display surface side of the liquid crystal display device, the LCD cell is pressed without overlapping with the polarizing plate 44 arranged on the same external surface. Further, the upper receiving plate 54 functions as a shield for electromagnetic noise generated by a circuit board 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LCD (liquid crystal display), and more particularly to a combination arrangement of an LCD cell and a circuit board.

[0002]

2. Description of the Related Art CRTs have been used as broadcast televisions, computers or various monitor outputs. In recent years, various flat displays have been used for these displays, contributing to miniaturization and thinning of devices. doing.
In particular, such a flat display is indispensable for making a computer portable and compact, and various types of liquid crystal displays, plasma displays, fluorescent display panels, and the like have been proposed. However, in general, a liquid crystal display, that is, a liquid crystal display device which has a small power consumption and obtains a stable display action is widely used. In a portable computer or the like, by incorporating the liquid crystal display device in a lid, it is extremely easy to use. Good computer is obtained.

FIG. 6 shows a conventional general liquid crystal display device, in which a well-known LCD cell 10 is connected to a display circuit board 1.
2 and fixed.

The LCD cell 10 itself has a structure in which a liquid crystal is sealed between two glass plates forming a common electrode and a segment electrode, and a polarizing plate is usually provided on the outer surfaces of both glass plates.

A predetermined display circuit element is mounted on the back side of the circuit board 12 so as to supply a predetermined drive voltage to the common electrode and the segment electrode of the LCD cell 10. A desired driving voltage is supplied to the LCD cell by connecting the pins with a pin or by using a conductive rubber or the like, and an arbitrary display operation is achieved.

Conventionally, an I cell is directly connected to an LCD cell.
It has been proposed to reduce the size of the device by mounting a C circuit. For example, an IC is directly mounted on a glass surface of an LCD cell as a COG (chip-on-glass) method to reduce the size and thickness.

Another conventional method is TAB.
It has been proposed to integrate an LCD cell and an IC circuit mounted on an FPC by a method.

[0008]

However, in such a conventional liquid crystal display device, as is apparent from FIG. 6, the LCD cell 10 and the display circuit board 12 are superimposed as a whole, so that the size and thickness of the liquid crystal display device are reduced. However, there is still a problem that the thickness of a portable computer which is strictly required is large.

[0009] Therefore, it has been the actual situation that the thickness of the display has not yet been reduced to a satisfactory level as a display incorporated in the lid of the above-mentioned computer which is carried in an attache case or the like.

[0010] In the conventional COG method described above, I
In order to reduce the input resistance of C, a metal film is required not only for the ITO of the LCD cell but also for the input pattern to the IC, and as a result, there is a problem that the cost of the LCD cell increases. In addition, in this COG method, if even a part of the IC mounted on the LCD cell becomes defective, the LCD cell itself must be discarded, and a defect is found after mounting the IC including such a defective part. in case of,
There is a problem that the production yield is remarkably reduced, and further, such an integrated cell requires a substrate for input.

Also, in the conventional TAB system which is another conventional system, it is necessary to form bumps for connecting the LCD cells, which increases the FPC cost and requires an input substrate. .

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described problems, and an object of the present invention is to provide an improved liquid crystal display device which does not deteriorate its functional characteristics while further reducing the thickness of the liquid crystal display device. .

[0013]

In order to achieve the above object, the present invention divides a display circuit board into a common circuit and a segment circuit board and arranges each circuit board corresponding to an electrode terminal edge of an LCD cell. Each circuit board and the LCD cell are connected by a flat cable.

Therefore, according to the present invention, the LCD cell and each circuit board are arranged on substantially the same plane. Further, in the present invention, each of the circuit boards is disposed so that an end thereof is overlapped with each corresponding glass end of the LCD cell, and at this time, each circuit board is electrically connected to the LCD cell. The flat cable is folded one or two times and folded between the LCD cell and the circuit board.

Further, according to the present invention, it is possible to obtain an extremely compact liquid crystal display device even in a plane without providing an unnecessary gap between the liquid crystal cell and the circuit board.

Further, according to the present invention, the LCD cell and each circuit board are fixed to a predetermined holder.
While connecting the CD cell and each circuit board with a flat cable, each board is arranged side by side with the LCD cell in the thickness direction, and the LCD cell and each board are arranged so that their ends are overlapped. Therefore, the overall thickness can be significantly reduced, and a thin liquid crystal display device suitable for a portable computer can be obtained.

[0017]

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

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

The liquid crystal display device according to the present embodiment comprises a display device with a backlight, and an EL (electroluminescence) light emitting plate 22 and an LCD cell 24 for forming a backlight are stacked on a holder case 20 to form a cell holder and a common circuit board. A screw fixing arrangement 30 is provided.

The LCD cell 24 has a laminated arrangement of a common glass 26 and a segment glass 28 in which liquid crystal is sealed in the same manner as in the prior art. Further, a polarizing plate, which will be described later, is laminated on the surfaces of the glasses 26 and 28.

As is well known, a common electrode is disposed on the surface of the common glass 26, and the common electrode terminal extends to the periphery of the common glass 26, that is, to the right end 26a in FIG. Similarly, a well-known segment electrode is also arranged on the surface of the segment glass 28, and the terminal of the segment electrode extends to the periphery indicated by reference numeral 28a.

In this embodiment, the display circuit board is divided into a common circuit board 30 and a segment circuit board 32, and these two boards 30 and 32 are connected to the respective electrode terminals 26 of the common glass 26 and the segment glass 28, respectively.
a, 28a.

Therefore, in the embodiment, the segment circuit board 32 has a board length substantially equal to the width of the terminal 28a of the segment glass 28, while the common circuit board 30 has a length equal to that of the common glass 26. Terminal 26
The width is set substantially equal to the sum of the width of a and the width of the segment circuit board 32. As a result, when the liquid crystal display device is assembled, the overall size is set to be a rectangle having the minimum area.

The common circuit board 30 and the segment circuit board 32 are formed of a heat-resistant resin board having both surfaces thereof affixed with copper, and an LCD driver IC is mounted on the lower surface. These driver ICs are mounted on a substrate with bare chips, wire-bonded, and then resin-sealed. As a result, the plane space of each substrate is reduced. Wirings for input signals and power are mounted on the upper surface pattern of each board, and electrical connection is made to each driver IC through through holes, thereby forming each of the circuit boards 30 and 32 with a minimum width. doing.

The common electrode terminal 26a and the common circuit board 30 are electrically connected by a flat cable 34. Similarly, the segment electrode terminal 28a and the segment circuit board 32 are electrically connected by a flat cable 36. Have been.

As is well known, the flat cable 36
Is also known as a heat seal connector, in which silver and graphite printed wiring are provided on a flexible thin polyester film substrate of 25 to 50 μm, and further, electrode terminals 26 are provided.
a, 28a and a hot-melt type adhesive are printed on the electrical connection portions with the circuit boards 30, 32, and the cable itself is freely bent by such a heat seal connector, so that a simple operation can be performed. A low-cost connector that is easily bonded and has high connection reliability can be formed.

FIG. 2 is a sectional view showing a connection state between the common electrode terminal 26a of the common glass 26 and the common circuit board 30.

In the drawing, the common glass 2 of the LCD cell 24 is attached to the holder case 20 via a cushion rubber 38.
6 is fixedly held. As is apparent from the figure, LC4 is provided between the common glass 26 and the segment glass 28.
0 is enclosed and held, and polarizing plates 42 and 44 are laminated on the surfaces of both glasses 26 and 28, respectively. In the gap between the holder case 20 and the LCD cell 24 formed by the cushion rubber 38, the above-described EL light emitting plate 22 for backlight is detachably inserted.

Normally, the life of the EL is thousands of hours, and it is essential to replace the EL in a practical use. However, the EL inserted in the gap by the structure shown in the embodiment is, for example, the left side of the holder. It can be easily replaced without removing screws or the like from the opening.

On the other hand, the end of the holder case 20 further extends leftward in the figure, and the common circuit board 30 is fixedly held by a set screw 46 as shown in the figure.
In this embodiment, a display circuit element 48 such as a common-side drive IC is mounted on the common circuit board 30 toward the back surface side of the liquid crystal display device, and even in an assembled state as shown in FIG. The thickness of the liquid crystal display 30 does not exceed the thickness of the LCD cell 24, and in the present invention, the liquid crystal display device can be significantly thinned.

In the embodiment, a circuit element such as a relatively large capacitor as indicated by reference numeral 50 may be mounted on the common circuit board 30, but as shown in FIG. EL for backlight
When the light-emitting plates 22 and the like are stacked, the arrangement of the present invention makes it possible to incorporate a circuit element having a large thickness such as the element 50 into the display without sufficiently increasing the thickness of the liquid crystal display device. Become.

As described above, the circuit terminals 26a of the common glass 26 and the common circuit board 30 are electrically connected by the flat cable 34, and as shown in FIG. The other end is connected to a terminal provided at an end of the common circuit board 30.

Then, after the connection between the two is completed, in the present invention, the end 3 of the common circuit board 30 is
Reference numeral 0a denotes an end of the common glass 26, and in the embodiment, is overlapped with the common electrode terminal 26a. In this state, the common circuit board 30 and the shield plate 45
Is firmly fixed to the holder case 20 by the set screw 46, and at the same time, the LCD cell 24 is also
Firmly held.

One end of the shield plate 45 is connected to the ground end of the common circuit board 30, and the shield plate 45 and the holder case 20 are electrically connected to each other via screws, thereby connecting the common circuit board 30 to the common circuit board 30. The shield plate 45 covers to prevent leakage of electromagnetic noise to the outside.

In this embodiment, in this state, the flat cable 34 connects the common circuit board 30 and the electrode terminal 26a of the common glass 26 by a single turn. Therefore, as is apparent from FIG.
The LCD cell 24 and the common circuit board 30 are partially overlapped with each other at their ends, thereby providing an arrangement in which a planar space can be significantly reduced.

Similarly, FIG. 4 shows the connection between the electrode terminals 28a of the segment glass 28 and the segment circuit board 32.
The upper receiving plate 54 is firmly held with respect to the segment circuit board 32 by a set screw 52, and the upper receiving plate 54 is arranged on the segment circuit board 32 by the set screw 52. A secure connection and fixing structure is obtained by fixing to the case 20. That is, the upper receiving plate 54 has one end 54a extending to the end of the segment glass 28 of the LCD cell 24, and
4 is firmly fixed to the holder case 20.
The upper receiving plate 54 and the holder case 20 are electrically connected via screws, and can effectively shield the segment circuit board 32 that generates electromagnetic noise.

A display circuit element 56 such as a segment drive IC is also arranged on the segment circuit board 32 toward the back side of the LCD cell 24. The thickness of the upper receiving plate 54 is substantially equal to the thickness of the upper polarizing plate 44. The circuit board and each mounted display circuit element can be accommodated without increasing the thickness of the liquid crystal display device.

FIG. 5 shows a state in which the segment glass 28 and the segment circuit board 32 are electrically connected to each other simply by the flat cable 36 as shown in FIG. The ICs mounted on each of the common circuit boards 30 are the LCD cells 24.
And the connector electrodes of these boards are provided on the side where the IC is arranged. The electrode terminal 28a of the segment glass 28 faces the lower side of the figure, and the connector electrode 32a of the segment circuit board 32 also faces the lower side. Therefore, as shown in FIG. 4, the flat cable 36 is electrically connected by double-folding as shown in FIG. 4 by overlapping the segment glass 28 at the connector end 32a of the segment circuit board 32 as shown in FIG. They are connected in a mechanically stable state.

Therefore, the LCD cell 24 is connected to both circuit boards 3
0, 32 together with the metal holder case 20,
Furthermore, it is screwed and fixed to the housing of the computer by a mounting tab or the like (not shown). As a result, external force applied to the computer housing is received by the metallic holder case 20 and the
It is possible to provide the cell 24 and the circuit boards 30 and 32 with a structure in which external force does not reach.

As described above, each of the circuit boards 30, 32
Are arranged substantially on the same plane as the liquid crystal cell 24 with the circuit element mounted thereon, and a part thereof is placed on top of the glass constituting the liquid crystal cell. Thus, a thin liquid crystal display device can be obtained.

In the above embodiment, the LCD cell is a double-sided polarizing plate type cell with a backlight, but the cell itself can be of any type.

[0042]

As described above, according to the present invention,
Divide the circuit board into a common circuit board and a segment circuit board, connect both boards to the electrode terminals of the LCD cell with a flat cable, and further superimpose the end of each circuit board on the corresponding LCD glass end By arranging the liquid crystal display, a liquid crystal display device whose thickness and planar dimensions are significantly reduced in size and thickness can be realized, and a display device particularly suitable for a portable computer or the like can be provided at a low price.

[Brief description of the drawings]

FIG. 1 is a plan view of a preferred embodiment in which a part of a liquid crystal display device according to the present invention is disassembled.

FIG. 2 is a cross-sectional view of a main part showing a connection state between a common-side electrode terminal and a circuit board in FIG. 1;

FIG. 3 is an explanatory view showing a folded state of the flat cable in FIG. 2;

FIG. 4 is a cross-sectional view of a main part showing a connection state between a segment-side electrode terminal and a circuit board in FIG. 1;

FIG. 5 is an explanatory view showing a folded state of the flat cable in FIG. 4;

FIG. 6 is a plan view showing a schematic configuration of a conventional liquid crystal display device.

[Explanation of symbols]

20 holder case, 24 LCD cell, 26 common glass, 26a common electrode terminal, 28 segment glass, 28a segment electrode terminal, 30 common circuit board, 32 segment circuit board, 34, 36 flat cable.

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] May 26, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Liquid crystal display device

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LCD (liquid crystal display), and more particularly to a combination arrangement of an LCD cell and a circuit board.

[0002]

2. Description of the Related Art CRTs have been used as broadcast televisions, computers or various monitor outputs. In recent years, various flat displays have been used for these displays, contributing to miniaturization and thinning of devices. doing.
In particular, such a flat display is indispensable for making a computer portable and compact, and various types of liquid crystal displays, plasma displays, fluorescent display panels, and the like have been proposed. However, in general, a liquid crystal display, that is, a liquid crystal display device which has a small power consumption and obtains a stable display action is widely used. In a portable computer or the like, by incorporating the liquid crystal display device in a lid, it is extremely easy to use. Good computer is obtained.

FIG. 6 shows a conventional general liquid crystal display device, in which a well-known LCD cell 10 is connected to a display circuit board 1.
2 and fixed.

The LCD cell 10 itself has a structure in which a liquid crystal is sealed between two glass plates forming a common electrode and a segment electrode, and a polarizing plate is usually provided on the outer surfaces of both glass plates.

A predetermined display circuit element is mounted on the back side of the circuit board 12 so as to supply a predetermined drive voltage to the common electrode and the segment electrode of the LCD cell 10. A desired driving voltage is supplied to the LCD cell by connecting the pins with a pin or by using a conductive rubber or the like, and an arbitrary display operation is achieved.

Conventionally, an I cell is directly connected to an LCD cell.
It has been proposed to reduce the size of the device by mounting a C circuit. For example, as a COG (chip-on-glass) method, an IC is directly mounted on the glass surface of an LCD cell to reduce the size and thickness.

Another conventional method is TAB.
It has been proposed to integrate an LCD cell and an IC circuit mounted on an FPC by a method.

[0008]

However, in such a conventional liquid crystal display device, as is apparent from FIG. 6, the LCD cell 10 and the display circuit board 12 are superimposed as a whole, so that the size and thickness of the liquid crystal display device are reduced. However, there is still a problem that the thickness of a portable computer which is strictly required is large.

[0009] Therefore, it has been the actual situation that the thickness of the display has not yet been reduced to a satisfactory level as a display incorporated in the lid of the above-mentioned computer which is carried in an attache case or the like.

[0010] In the conventional COG method described above, I
In order to reduce the input resistance of C, a metal film is required not only for the ITO of the LCD cell but also for the input pattern to the IC, and as a result, there is a problem that the cost of the LCD cell increases. In addition, in this COG method, if even a part of the IC mounted on the LCD cell becomes defective, the LCD cell itself must be discarded, and a defect is found after mounting the IC including such a defective part. in case of,
There is a problem that the production yield is remarkably reduced, and further, such an integrated cell requires a substrate for input.

Also, in the conventional TAB system which is another conventional system, it is necessary to form bumps for connecting the LCD cells, which increases the FPC cost and requires an input substrate. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide an improved liquid crystal display device which does not deteriorate the characteristics of the display device while further reducing the thickness of the liquid crystal display device. is there.

[0013]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and has the following features. First, in the liquid crystal display device of the present invention, an LCD cell configured by sealing liquid crystal between two substrates is housed in a device housing, and the outer surface of the substrate at least on the display front side of the LCD cell A polarizing plate, and in a cell edge region of the LCD cell, and in a region not covered by the polarizing plate, a cell upper receiving member presses the LCD cell from the display front side, and the device It is fixed and held in the housing.

By supporting the LCD cell so that the upper receiving plate member does not cover a polarizing plate having a predetermined thickness,
The thickness of the liquid crystal display device can be reduced accordingly. In particular, if the thickness of the upper receiving plate member is substantially equal to that of the polarizing plate, the contribution to the reduction in the thickness of the device is increased. Further, since the area of the LCD cell not covered by the polarizing plate is a non-display area that does not contribute to normal display, even if such a non-display area is pressed by the upper receiving plate member, the effective display area is not affected. Without this, it is also possible to prevent the light from the light source arranged behind the LCD cell from leaking to the display surface side (display front side) due to the absence of the polarizing plate.

Further, a circuit board on which a display circuit element for driving the LCD cell is mounted is disposed in a side space of the LCD cell fixed and held in the apparatus housing, The plate member extends to a cell edge region of the LCD cell so as to cover a display front side of the circuit board.

Further, since the above-mentioned receiving plate member on the cell has an electromagnetic shielding function, it is possible not only to mechanically protect the circuit board but also to effectively shield the circuit board which generates electromagnetic noise. Becomes

Further, in the present invention, the above-mentioned cell receiving plate member is screwed and fixed to the device housing, and the LCD cell is connected to the display front side at one end extending from a fixing portion of the above-mentioned cell receiving plate member. It is possible to adopt a configuration in which pressing is performed.

Another feature of the present invention is that in a liquid crystal display device, an LCD in which liquid crystal is sealed between two substrates is provided.
A cell is housed in a device housing, and in the device housing, the LCD is provided in a lateral space of the LCD cell fixed and held.
A circuit board on which a display circuit element for driving a cell is mounted is disposed so as to at least partially overlap the LCD cell near a cell end region, and the circuit board and the L board
In the cell end region where the CD cell overlaps, the upper receiving plate member presses the LCD cell and the circuit board from the front side of the display and fixes and holds the LCD cell and the circuit board to the apparatus housing.

Further, the upper receiving plate member is fixed to the device housing by screws, extends from the fixed end to which the screws are fixed in the front direction of the display, and has a free end formed with the LCD.
A configuration in which the cell and the circuit board are pressed from the front side of the display can be adopted.

With such a configuration, the LCD cell and the circuit board can be easily and reliably fixed to the apparatus housing by using the upper receiving plate member.

A further feature of the present invention is that a cushion for supporting the cell end region of the LCD cell from the display back side of the device is arranged in a gap between the device housing and the LCD cell. is there.

For example, when at least a part of the circuit board is overlapped with the LCD cell in the vicinity of the cell edge region of the LCD cell, the cushion member is placed in the vicinity of the overlapped region. It is arranged in a gap between the device housing and the LCD cell. The cushion member is, for example, rubber.

When the circuit board is disposed on the display back side of the LCD cell, a circuit board superposed on the LCD cell is interposed between the LCD cell and the cushion member.

The LCD cell, which is held down from the front side of the display by the upper receiving plate member and pressed against the display housing, is supported by the cushion member from the rear side thereof, so that the LCD cell formed using a glass substrate or the like can be used. Damage can be prevented. In particular, when the circuit board and the LCD cell are superposed and arranged in the cell edge region, these regions are supported from the back side by using a cushion member, so that the LCD cell is supported.
Damage to both the cell and the circuit board can be prevented. In addition, the stress applied to the housing of the liquid crystal display device can be absorbed by the cushion member, which contributes to the improvement of the reliability of the device.

Still another feature of the present invention is a liquid crystal display device in which an LCD cell formed by enclosing liquid crystal between two substrates is accommodated in a device housing, wherein the LCD cell is fixed in the device housing. In the lateral space of the held LCD cell, the LCD
A circuit board on which a display circuit element for driving the cell is mounted is arranged, and the circuit board presses the cell end area of the LCD cell from the front side of the display so that the cell end area of the LCD cell is That is, the LCD cells are fixedly held on the device housing by the circuit board.

With such a configuration, the LCD cell can be fixedly held on the device housing without providing a special member separately.

Further, the LCD cell is supported from the display back side in the gap between the device housing and the LCD cell near the cell end region where the LCD cell and the circuit board are overlapped and arranged. If you place a cushion member,
The LCD cell and the circuit board can be prevented from being damaged, and the stress resistance of the device can be increased.

Further, if a display circuit element is mounted on the display back side of the circuit board and a shield member is disposed on the display front side of the circuit board, the display circuit element generating electromagnetic noise can be shielded. It can be easily shielded by a member (for example, a shield metal plate).

Still further, in the present invention, the circuit board is superimposed on one of the substrates constituting the LCD cell, and the circuit board is substantially equal to or less than the thickness of the other substrate forming a pair with the one substrate. Or the total thickness of the thickness of the substrate disposed on the front side of the display and the thickness of the polarizing plate provided on the outer surface thereof.

By setting the circuit board to such a thickness,
This circuit board can be placed on top of one of the LCD cell substrates without increasing the thickness of the device.

[0031]

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

FIG. 1 is a plan view showing a state where a part of the liquid crystal display device according to the embodiment of the present invention is disassembled.

The liquid crystal display device according to the present embodiment comprises a display device with a backlight. An EL (electroluminescence) light-emitting plate 22 and an LCD cell 24 for forming a backlight are laminated on a holder case 20, and a cell holder and a common circuit board are provided. A screw fixing arrangement 30 is provided.

The LCD cell 24 has a laminated arrangement of a common glass 26 enclosing liquid crystal and a segment glass 28 as in the prior art, and a polarizing plate described later is laminated on the outer surfaces of both glasses 26, 28. .

As is well known, a common electrode is disposed on the surface of the common glass 26, and the common electrode terminal extends to the periphery of the common glass 26, that is, to the right end 26a in FIG. Similarly, a well-known segment electrode is also arranged on the surface of the segment glass 28, and the terminal of the segment electrode extends to the periphery indicated by reference numeral 28a.

In this embodiment, the display circuit board is divided into a common circuit board 30 and a segment circuit board 32, and these two boards 30, 32 are respectively connected to the electrode terminals 26 of the common glass 26 and the segment glass 28 described above.
a, 28a.

Accordingly, in the embodiment, the length of the segment circuit board 32 is set substantially equal to the width of the terminal 28a of the segment glass 28, while the length of the common circuit board 30 is set to the length of the common glass 26. Terminal 26
The width is set substantially equal to the sum of the width of a and the width of the segment circuit board 32. As a result, when the liquid crystal display device is assembled, the overall size is set to be a rectangle having the minimum area.

The common circuit board 30 and the segment circuit board 32 are made of a heat-resistant resin board having both surfaces thereof affixed with copper, and an LCD driver IC is mounted on the lower surface. These driver ICs are mounted on a substrate with bare chips, wire-bonded, and then resin-sealed. As a result, the plane space of each substrate is reduced. Wirings for input signals and power are mounted on the upper surface pattern of each board, and electrical connection is made to each driver IC through through holes, thereby forming each of the circuit boards 30 and 32 with a minimum width. doing.

The common electrode terminal 26a and the common circuit board 30 are electrically connected by a flat cable 34. Similarly, the segment electrode terminal 28a and the segment circuit board 32 are electrically connected by a flat cable 36. Have been.

As is well known, the flat cable 36
Is also known as a heat seal connector, in which silver and graphite printed wiring are provided on a flexible thin polyester film substrate of 25 to 50 μm, and further, electrode terminals 26 are provided.
a, 28a and a hot-melt type adhesive are printed on the electrical connection portions with the circuit boards 30, 32, and the cable itself is freely bent by such a heat seal connector, so that a simple operation can be performed. A low-cost connector that is easily bonded and has high connection reliability can be formed.

FIG. 2 is a sectional view showing the positional relationship between the LCD cell 24 and the common circuit board 30 and the connection between the common electrode terminal 26a of the common glass 26 and the common circuit board 30.

In the figure, an LCD is provided on a holder case 20, which is an apparatus housing, through a cushion member (this material is, for example, rubber; hereinafter, referred to as cushion rubber) 38.
The common glass 26 of the cell 24 is fixedly held. In the end portion of the common glass 26, that is, in the cell end region of the LCD cell 24, the common circuit board 30 is overlapped with the common glass 26, and the common circuit board 30 displays the common glass 26 in the display front direction, that is, in the upper part of FIG. The cushion rubber 38 supports the common glass 26 from the rear side of the display. In addition, as is clear from the figure,
L between the common glass 26 and the segment glass 28
C40 is enclosed and held. In addition, both glasses 26, 28
The polarizing plates 42 and 44 are respectively laminated on the surface of. Further, as shown in FIG. 2, the thickness of the common circuit board 30 is equal to or less than the total thickness of the segment glass 28 facing the common glass 26 and the thickness of the polarizing plate 44 on the outer surface thereof. (Specifically, in the present embodiment, the thickness of the common circuit board 30 is set to be equal to or less than the thickness of the segment glass 28 provided therewith).

As shown in FIG.
The end of the common circuit board 30 extends leftward in the figure, and the common circuit board 30 is fixed to the case 2 by a set screw 46 as shown in the figure.
0 is fixedly held. A display circuit element 48 such as a common-side drive IC is mounted on the common circuit board 30 facing the display back side of the device. Even in an assembled state as shown in the drawing, the circuit board 30 in the circuit element mounted state is mounted on the common circuit board 30. The thickness does not exceed the thickness of the LCD cell 24, and in the present invention, the liquid crystal display device can be significantly thinned.

The above-described EL light-emitting plate 22 for a backlight is detachably inserted into the gap between the holder case 20 and the LCD cell 24 formed by the cushion rubber 38. Normally, the life of the EL is thousands of hours, and in practice it is essential to replace the EL in use.
With the structure shown in the embodiment, the EL inserted in the gap can be easily replaced without removing a screw or the like from the opening on the left side of the holder, for example. Further, in the embodiment, a circuit element such as a relatively large capacitor such as 50 is mounted on the common circuit board 30 in some cases. However, as shown in FIG. When the EL light emitting plates 22 and the like are stacked and arranged,
A display circuit element mounted on a circuit board, for example, a circuit element having a large thickness such as the element 50 can be arranged in a space beside the EL light emitting plate 22 and the LCD cell 24, thereby increasing the thickness of the liquid crystal display device. Such an element can be incorporated in the housing without the need.

The circuit terminal 26a of the common glass 26 and the common circuit board 30 are connected to the flat cable 34 as described above.
, And as shown in FIG.
The flat cable 34 has one end connected to the common circuit terminal 26a and the other end connected to the common circuit board 30.
Is connected to the terminal provided at the end of.

After the connection is completed in this manner, in the present embodiment, the end 30a of the common circuit board 30 becomes the end of the common glass 26 (cell end region). Is the common electrode terminal 26 described above.
a. In this state, the common circuit board 30 and the shield plate 45 are firmly fixed to the holder case 20 by the set screw 46, and the LCD cell 24 is firmly fixed and held by the circuit board 30 at the same time.

One end of the shield plate 45 is connected to the ground end of the common circuit board 30, and the shield board 45 and the holder case 20 are electrically connected to each other via screws, thereby connecting the common circuit board 30 to the common circuit board 30. The shield plate 45 covers to prevent leakage of electromagnetic noise to the outside.

In this embodiment, in such a state, the flat cable 34 connects the common circuit board 30 and the electrode terminal 26a of the common glass 26 by a single turn. Therefore, as is apparent from FIG.
The LCD cell 24 and the common circuit board 30 are partially overlapped with each other at their ends, thereby providing an arrangement in which a planar space can be significantly reduced.

FIG. 4 shows the positional relationship between the LCD cell 24 and the segment circuit board 32 and the connection between the electrode terminals 28a of the segment glass 28 and the segment circuit board 32. The segment circuit board 32 is the holder case 20
The upper receiving plate 54 is disposed on the segment circuit board 32 with the set screw 52, and the upper receiving plate 54 is integrally held with the segment circuit board 32 by the set screw 52. It is fixed to the case 20 to obtain a firmly connected and fixed structure. Here, one end 54a of the upper receiving plate 54 is fixed to the LCD cell 24 from the fixed portion.
, The LCD cell 24 is pressed down from the front side of the display, that is, from above in FIG. 4, and the LCD cell 24 is fixed and held firmly on the holder case 20. I have. Here, as shown in FIG. 4, one end of the upper receiving plate 54 is a free end, and the free end is fixed to the polarizing plate 44 on the surface of the segment glass 28 from the screwed fixed end. It extends to the uncovered end region and holds the segment glass 28 from above. Further, as shown in FIG. 4, the thickness of the upper receiving plate 54 is set to be substantially the same as the thickness of the upper polarizing plate 44, and the circuit board and each of the mounted components are provided without increasing the thickness of the liquid crystal display device. It is possible to house the display circuit element. Further, the upper receiving plate 54 and the holder case 20 are electrically connected via screws, and the upper receiving plate 54 covers the segment circuit board 32 from the fixing portion thereof to the end region of the segment glass 28. Therefore, the segment circuit board 32 that generates electromagnetic noise is effectively shielded.

A display circuit element 56 such as a segment driving IC is also mounted on the segment circuit board 32. These elements 56 are provided on the back side of the LCD cell 24, that is, on the display back side of the circuit board 32. .

As is clear from FIG. 4, in the present embodiment, the segment glass 28 and the segment circuit board 3
The cushion rubber 38 is provided in a region where the second rubber 2 and the second rubber 2 are overlapped and pressed from above by the upper receiving plate 54. The cushion rubber 38 is used for the circuit board 3.
It is supported from the back side of the display with the segment glass 28 via 2.

Further, the thickness of the segment circuit board 32 is
As shown in FIG. 4, the thickness is set to be equal to or less than the total thickness of the common glass 26 facing the segment glass 28 and the thickness of the polarizing plate 42 on the outer surface thereof (in this embodiment, in particular, The circuit board 32 is set to have a thickness equal to or less than the common glass 26 provided therewith.)

FIG. 5 shows a state in which the segment glass 28 and the segment circuit board 32 are simply electrically connected to each other with the flat cable 36 as shown in FIG. The ICs mounted on each of the common circuit boards 30 are the LCD cells 24.
And the connector electrodes of these boards are provided on the side where the IC is arranged. The electrode terminal 28a of the segment glass 28 faces the lower side of the figure, and the connector electrode 32a of the segment circuit board 32 also faces the lower side. Therefore, as shown in FIG. 4, the flat cable 36 is electrically folded and double-folded as shown in FIG. 4 by overlapping and overlapping the segment glass 28 at the connector electrode 32a of the segment circuit board 32 as shown in FIG. Connected in a mechanically stable state.

Therefore, the LCD cell 24 is connected to both circuit boards 3
0, 32 together with the metal holder case 20,
Furthermore, it is screwed and fixed to the housing of the computer by a mounting tab or the like (not shown). As a result, external force applied to the computer housing is received by the metallic holder case 20 and the
It is possible to provide the cell 24 and the circuit boards 30 and 32 with a structure in which external force does not reach.

As described above, each of the circuit boards 30, 32
Are arranged substantially on the same plane as the liquid crystal cell 24 with the circuit element mounted thereon, and a part thereof is placed on top of the glass constituting the liquid crystal cell. Thus, a thin liquid crystal display device can be obtained.

In the above-described embodiment, the LCD cell is a double-sided polarizing plate type cell with a backlight, but the cell itself can be of any type.

[0057]

As described above, according to the present invention,
An LC cell having a polarizing plate on at least the outer surface of the substrate on the display front side of the LCD cell but not covered by the polarizing plate
In the cell edge region of the D cell, the upper receiving plate member is
The cell is pressed from the front side of the display and fixedly held in the device housing.
By doing so, it is possible to provide a liquid crystal display device whose thickness and planar dimensions are significantly reduced in size and thickness, and it is possible to provide a display suitable for a portable computer or the like at a low price.

In a configuration in which a circuit board is superimposed on an LCD cell in the vicinity of a cell end area of the LCD cell in the apparatus housing, an area where the LCD cell and the circuit board overlap is formed by an upper receiving plate member. It is pressed down from the front of the display and fixedly held on the device housing. For this reason, LCD
The cell and the circuit board can be fixed and held securely and easily to the device housing.

Further, in the present invention, the cushion member is disposed on the display back side of the LCD cell (particularly, on the display back side in the area where the LCD cell and the circuit board overlap), so that the upper receiving plate member presses down from the display front side. An LCD cell or a circuit board to be used is supported by the cushion member from the display rear side. As a result, the LCD cell and the circuit board can be reliably held in the apparatus housing without being damaged by external force or the like.

[Brief description of the drawings]

FIG. 1 is a plan view of a preferred embodiment in which a part of a liquid crystal display device according to the present invention is disassembled.

FIG. 2 is a cross-sectional view of a main part showing a connection state between a common-side electrode terminal and a circuit board in FIG. 1;

FIG. 3 is an explanatory view showing a folded state of the flat cable in FIG. 2;

FIG. 4 is a cross-sectional view of a main part showing a connection state between a segment-side electrode terminal and a circuit board in FIG. 1;

FIG. 5 is an explanatory view showing a folded state of the flat cable in FIG. 4;

FIG. 6 is a plan view showing a schematic configuration of a conventional liquid crystal display device.

[Description of Signs] 20 holder case, 24 LCD cell, 26 common glass, 26a common electrode terminal, 28 segment glass, 28a segment electrode terminal, 30 common circuit board, 32 segment circuit board, 34, 36 flat cable.

Claims (1)

[Claims] 1. A common glass having a common electrode disposed on a surface thereof and having a common electrode terminal extending on a peripheral edge thereof, and a segment electrode having a common electrode disposed on a surface extending on a peripheral edge of the common glass and having a liquid crystal interposed between the common glass and the common glass. A liquid crystal display device comprising: an LCD cell having a sandwiched segment glass; and a circuit board on which a display circuit element is mounted and connected to an electrode terminal of the LCD cell, wherein the circuit board is a common circuit board, a segment circuit board, A liquid crystal display device, wherein each circuit board is connected to an electrode terminal of an LCD cell by a flat cable, and an end of the circuit board is arranged so as to overlap with an end of the corresponding LCD glass. .