JPH0854638A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To provide the constitution of a liquid crystal display device capable of reducing the size of the whole liquid crystal display device while maintaining a required size of a liquid crystal display panel. CONSTITUTION:In the liquid crystal display device 1 constituted of the liquid crystal display panel 2, the drive circuit substrates 3, 4-1, 4-2 of the liquid crystal display panel 2 and a control circuit substrate 5, a first drive circuit substrate 3 being at least a part of the drive circuit substrate is connected to the liquid crystal display panel 2 through a flexible connection wiring part 30, and second drive circuit substrates 4-1, 4--2 being the remaining drive circuit substrates are connected to the liquid crystal display panel 2 fixedly, and the flexible connection wiring parts 61, 62 are connected to the second drive circuit substrates 4-1, 4-2, and connector insertion parts 63, 64 are provided on one end parts E of the flexible connection wiring parts 61, 62, and input/output connector parts 51, 52 fitting to and connecting with the connector insertion parts 63, 64 are provided on the control circuit substrate 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device. More specifically, the area occupied by a drive control system provided around a liquid crystal display panel is reduced to reduce the size of the entire liquid crystal display device. The present invention relates to a liquid crystal display device that can be realized.

[0002]

2. Description of the Related Art Conventionally, as a standard configuration of a liquid crystal display device, as shown in FIG. 4, a liquid crystal display panel section 2 and one side 21 of the liquid crystal display panel section 2 are provided with an image scanning and timing. A common electrode drive circuit board 3 provided with a plurality of driving ICs 31 to 3n for driving and controlling a common electrode (Y electrode) to be operated is provided, and the other pair of sides 2 is provided.
2 and 23 are provided with a plurality of driving ICs 41 for driving and controlling the segment electrodes (X electrodes) for inputting image information.
Segment electrode drive circuit board 4-1 provided with
And 4-2 are provided.

Further, in the above-mentioned conventional liquid crystal display device, the driving I provided on the common electrode drive circuit board 3 and the segment electrode drive circuit boards 4-1 and 4-2 are used.
The control circuit board 5 is composed of an LSI or the like for individually controlling the driving of each of C31 to 3n and 41 to 4n, an input / output unit 6, and a microcomputer or the like for controlling the arithmetic processing of the control circuit board 5. Central computing means 7
A peripheral circuit board 8 and the like are provided.

In the conventional liquid crystal display device 1 as described above, the common electrode drive circuit board 3 and the segment electrode drive circuit boards 4-1 and 4-2 are generally the same as those of the liquid crystal display panel 2. A driving IC integrally and fixedly joined to the side edge portion and provided on the common electrode drive circuit board 3 and the segment electrode drive circuit boards 4-1 and 4-2.
31 to 3n and 41 to 4n are suitable wirings 9, 10, 1
It is connected to a predetermined input / output terminal portion of the control circuit board 5 via 1 or the like.

Therefore, in the conventional liquid crystal display device 1, in addition to the size of the liquid crystal display panel 2, the common electrode drive circuit board 3 and the segment electrode drive circuit boards 4-1 and 4-2 are included. Since the respective sizes are added, the size of the liquid crystal display device 1 as a whole is inevitably larger than the size of the liquid crystal display panel 2 and therefore the size of the liquid crystal display device 1 as a whole. In the case of downsizing, there is no choice but to sacrifice the size of the liquid crystal display panel 2 itself.

Further, as shown in FIG. 4, when the driving circuit ICs 3, 9 and 10 for driving the common electrodes and the segment electrodes are mounted on a liquid crystal display panel, for example, the liquid crystal display panel 2 faces at least 2 A liquid crystal is sandwiched between a pair of transparent glass substrates or plastic substrates, and the periphery of the liquid crystal is sealed with a sealing material. IC41 ~
So-called C where 4n is mounted face down
In the case of the OG (chip on glass) structure, since the connection between the control circuit board 5 and the liquid crystal display panel 2 is configured as shown in FIG. 4, the input / output terminals connect the control circuit board 5 to the liquid crystal display panel 2. Concentrate on face-to-face.

Therefore, it is necessary to narrow the space between the adjacent input / output terminals and to reduce the thickness of the electrodes. Therefore, there is a problem that short-circuits between the electrodes, disconnection, and electrode resistance increase. It was Furthermore, in the conventional case, in a liquid crystal display device in which a control circuit board is configured with a common electrode drive circuit and then connected to a liquid crystal display panel by a flexible board, the mounting yield of the control circuit section is There is also a problem that the cost of the product is increased because a difference from the mounting yield of the common electrode drive circuit unit occurs and the yield of the board is determined by the bad mounting yield.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to improve the above-mentioned drawbacks of the prior art and to reduce the size of the entire liquid crystal display device while maintaining the required size of the liquid crystal display panel. A liquid crystal display that provides the structure of a display device, solves the problem of short-circuiting or disconnection between adjacent input / output terminals, or increases the electrode resistance, and can improve the packaging yield and reduce the cost of the product. A device is provided. Is.

[0009]

In order to achieve the above-mentioned object, the present invention basically adopts the technical constitution as described below. That is, a liquid crystal display panel and a drive circuit board that is arranged around the liquid crystal display panel and has a panel drive IC group that drives the panel and the drive circuit board are connected to each panel drive I of the drive circuit board.
A liquid crystal display device comprising a control circuit board for individually driving and controlling C, wherein at least a part of the first drive circuit board is a flexible connection wiring portion. In the liquid crystal display device, the second drive circuit board, which is the remaining drive circuit board, is fixedly connected to the liquid crystal display panel while being connected to the liquid crystal display panel via Connection wiring connected to the input terminal of each panel drive IC provided on the second drive circuit board and supplying a control signal for individually controlling the drive of each panel drive IC. Is connected to a flexible and flexible connection wiring portion, a connector insertion portion is provided at one end of the flexible and flexible connection wiring portion, and the control circuit board is Second A connector section for outputting a control signal for individually driving and controlling each panel drive IC provided on the drive circuit board is provided, and the connector section and the connector insertion section can be fitted and connected to each other. It is a liquid crystal display device configured in.

Further, in the liquid crystal display device according to the present invention, the drive connected to the liquid crystal display panel via the flexible connection wiring portion is utilized by utilizing the above-mentioned basic structure. A liquid crystal display device in which the circuit board or the drive circuit board and a control board that controls driving of the drive circuit board are arranged below the back surface of the liquid crystal display panel in a folded state.

[0011]

Since the liquid crystal display device 1 according to the present invention employs the basic technical structure as described above, the drive circuit board is in a folded state, and the liquid crystal display panel 1 has a rear surface. Since it is possible to arrange the drive circuit board in the lower part, at least a part of the drive circuit board conventionally arranged around the liquid crystal display panel of the liquid crystal display device,
Since the area occupied exclusively can be omitted, the area of the peripheral circuit portion of the liquid crystal display panel can be reduced accordingly, and therefore the overall size of the liquid crystal display device can be maintained while maintaining the required size of the liquid crystal display panel. , Can be reduced.

Furthermore, in the liquid crystal display device 1 according to the present invention, each panel drive IC is individually driven and controlled on a part of the drive circuit board directly connected to the liquid crystal display panel. The flexible connecting wiring portion including the connecting wiring for supplying the control signal is connected, and one end of the flexible connecting wiring portion, that is, the end closer to the control circuit board is connected. A connector insertion part in which the ends of the respective wiring parts are gathered together, and the control circuit board individually controls the drive of each panel drive IC provided on the drive circuit board. The control circuit board is provided with a connector section for outputting the control signal, and the connector section and the connector insertion section are configured so that they can be fitted and connected to each other. But LCD display Even if that is allowed disposed below the back surface of the panel, or by appropriately bending the connection wiring portion with the flexible flexible, by the bend,
Since the connector insertion portion is configured to be easily inserted into the connector portion, the assembly operation becomes easy,
In addition to contributing to a remarkable improvement in work efficiency, it becomes possible to manufacture a small liquid crystal display panel having a stable and reliable connection portion.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific examples of the liquid crystal display device according to the present invention will be described in detail below with reference to the drawings. That is, in FIG.
FIG. 1 is a plan view showing a configuration of a specific example of a liquid crystal display device 1 according to the present invention, in which a liquid crystal display panel 2 and a panel drive IC group arranged around the liquid crystal display panel 2 and driving the panel 2 are shown. Drive circuit boards 3, 4-1 and 4-2 having 31 to 3n and 41 to 4n and the drive circuit boards 3, 4-1
And 4-2, and each panel drive IC 31-3n and 41-4n of the drive circuit board 3, 4-1 and 4-2.
In the liquid crystal display device 1 including a control circuit board 5 for individually driving and controlling the first drive circuit board 3, at least a part of the first drive circuit board 3 is a flexible and flexible connection. The second drive circuit boards 4-1 and 4-2 which are connected to the liquid crystal display panel 2 via the wiring portion 30 and are the remaining drive circuit boards are fixed to the liquid crystal display panel 2. In the liquid crystal display device 1 that is electrically connected, the second drive circuit boards 4-1 and 4
Reference numeral 2 denotes a control signal that is connected to the input terminals of the panel drive ICs 41 to 4n provided on the drive circuit boards 4-1 and 4-2 and that individually controls the panel drive ICs 41 to 4n. The flexible and flexible connection wiring portions 61 and 62 including the supply wirings 9 and 10 are connected, and the flexible and flexible connection wiring portion 6 is connected.
Panel insertion ICs provided with connector insertion portions 63 and 64 at one end E of the first drive circuit 62 and the second drive circuit board 4-1 and 4-2 provided on the control circuit board 5.
Input / output connector sections 51 and 52 for outputting control signals for individually controlling the drive of the 41 to 4n are provided, and the connector sections 51 and 52 and the connector insertion sections 63 and 64 are fitted and connected to each other. A liquid crystal display device 1 is shown, which is constructed in a sensible manner.

In the liquid crystal display device 1 according to the present invention, the flexible connecting wiring portions 3 and 6 are provided.
1 and 62 are used in an appropriate combination, and connector insertion portions 63 and 64 are provided at the free end portions E of the flexible connection wiring portions 61 and 62, and the connector is inserted into the control circuit board. Since the connector parts 51 and 52 for receiving the parts 63 and 64 are arranged, the flexible connecting wiring parts 3, 61 and 6 are provided.
2 is bent, curved, or bent as necessary, so that the connector insertion portions 63, 64 and the connector portion 51,
Since it is possible to compactly arrange the connection portion with 52 on the lower peripheral portion of the liquid crystal display panel 2, it is possible to reduce the overall size while maintaining the size of the image display portion of the liquid crystal display panel 2. Is possible.

That is, in the liquid crystal display device 1 of the present invention shown in FIG. 1, as an example, the first drive circuit board 3 and the second drive circuit board 4 connected to the liquid crystal display panel 2 are connected. 1 and 4-2, which is a first drive circuit board for operating image scanning and timing, and a plurality of drive ICs 31 for driving and controlling a common electrode (Y electrode)
To 3n are connected to the common electrode drive circuit board 3 to the liquid crystal display panel 2 via the flexible and flexible connection wiring portion 30, and the common electrode drive circuit board 3 is the first drive circuit board. The electrode drive circuit board 3 is configured to be bendable, bendable, and foldable with respect to the liquid crystal display panel 2.

That is, in each of the plurality of driving IC groups 31 to 3n provided on the common electrode driving circuit board 3, the output terminal portion of each driving IC group 31 to 3n is flexible and flexible. Each printed wiring is connected to a certain connection wiring portion 30, and is electrically connected to each of the common electrodes (Y electrodes) of the liquid crystal display panel 2 via the respective wirings.

In the liquid crystal display device 1 according to the present invention, as shown in FIG. 1, the first drive circuit board 3 is flexibly connected to the liquid crystal display panel 2, and Second drive circuit board 4 which is another drive circuit board
-1 and 4-2, that is, the drive circuit boards 4-1 and 4-2 having a plurality of drive IC groups 41 to 4n for driving and controlling the segment electrodes (X electrodes) are provided to the liquid crystal display panel 2. Although, for example, an example in which they are fixedly or integrally arranged is shown, the liquid crystal display device 1 according to the present invention
Is not limited to the specific example, and the drive circuit boards 4-1 and 4-2 are connected to the liquid crystal through the wiring printed on the flexible connection wiring portions 61 and 62. It goes without saying that the common electrode drive circuit board 3 electrically connected to each of the segment electrodes (X electrodes) of the display panel and fixedly connected to the liquid crystal display panel 2 may be used. .

Further, as illustrated in FIG. 3, a plurality of driving IC groups 41 to 4n for driving and controlling the segment electrodes (X electrodes) are provided on the flexible and flexible connection wiring portions 61 and 62. It may be configured as implemented,
All the drive circuit boards 3, 4-1 and 4-2 are connected to the liquid crystal display panel via wiring printed on the flexible connecting wiring portions 30, 61 and 62. You can

Wherein, the first used in the present invention
Connection circuit part 30 which is flexible and connects the drive circuit board 3 and the liquid crystal display panel 2, and / or the second drive circuit boards 4-1 and 4-2 and the control circuit board. 5, flexible connecting wiring portions 61 and 62, and further, a flexible connecting wiring portion that connects the first drive circuit board 3 and the control circuit board 5 with each other. As 50 or the like, it is possible to use, for example, a base film made of a polyimide resin on which a wiring portion constituted by a predetermined number of lead patterns obtained by etching a copper foil is formed.

In the present invention, the liquid crystal display device 1 is provided.
Since it has the above-mentioned structure, the flexible circuit board 3 connected to the liquid crystal display panel 2 through the flexible connection wiring part 30 has the flexibility as shown in FIG. It is desirable that the connection wiring part 30 having a certain shape is bent and arranged below the back surface part of the liquid crystal display panel 2 by utilizing its flexibility.

By adopting such a configuration, it is possible to eliminate the space area which was conventionally occupied by the drive circuit board 3 and the control circuit board 5. That is, the drive circuit board 3 and the control circuit board 5 can be arranged in the liquid crystal display panel portion which is a connection portion between the liquid crystal display panel 2 and the connection wiring portion 30 and does not form an image. .

Further, in another embodiment of the liquid crystal display device 1 according to the present invention, the first drive circuit board 3 and the second drive circuit boards 4-1 and 4-2 are individually provided. In the control circuit board 5 for drive control, the first drive circuit board is connected to the liquid crystal display panel 2 through at least the flexible connection wiring portion 30, that is, in the above specific example. In other words, the control circuit board unit 5 that drives and controls the common electrode (Y electrode) drive circuit board 3 is connected to the drive circuit board 3 through another flexible and flexible connection wiring unit 50. Is desirable.

In the present invention, as described above, in the control circuit board portion 5, the drive control circuit 5'for controlling the drive of the first drive circuit board 3 and the second drive circuit. Board 4
-1 and 4-2 drive control circuit 5 "for controlling the drive,
When formed on different circuit boards different from each other, only the first drive circuit board 3 and the drive control circuit 5 ′ for controlling the drive of the first drive circuit board 3 are flexible. The connection wiring section 50 may be used for connection, but in the control circuit board section 5, a drive control circuit 5 ′ for controlling the drive of the first drive circuit board 3 and the second drive circuit. The drive control circuit 5 ″ for controlling the drive of the substrates 4-1 and 4-2 is
When they are formed on the same substrate, the control circuit 5
The whole may be connected to the first drive circuit board 3 via the flexible and flexible connection wiring portion 50.

In this case, as described above, the second drive circuit boards 4-1 and 4-2 and the second drive circuit board 4 are used.
-1 and 4-2 are connected to the drive control circuit 5 "for driving and controlling them through flexible and flexible connecting wiring portions 61 and 62, and the flexible and flexible connecting wiring portions are connected. Connector parts 51, 52 provided in a drive control circuit 5 ″ for driving and controlling the second drive circuit boards 4-1 and 4-2 with the connector insertion parts 63, 64 provided at one end parts of 61, 62. By inserting and fittingly connecting to the connection wiring part 30,
It is possible to easily perform the connecting operation while appropriately bending, curving, and maintaining the folded state of 50, 61, and 62.

Therefore, in the above-described specific example of the present invention, as shown in FIG. 2, the liquid crystal display panel 2 is connected to the liquid crystal display panel 2 through the flexible connection wiring portion 30, for example. The drive circuit board 3 and the control circuit board portion 5 connected to the drive circuit board 3 via the flexible connection wiring portion 50 are folded and overlapped with each other. The liquid crystal display panel 2 can be arranged below the back surface.

Therefore, in the above-described specific example of the present invention, the space area portion which the control circuit board 3 and the drive circuit board 5 occupy in the prior art can be omitted.
The area of the peripheral control circuit portion of the liquid crystal display panel 2 in the liquid crystal display device 1 can be significantly reduced. On the other hand, in the specific example of the liquid crystal display device according to the present invention described above, the connection relationship between the common electrode (Y electrode) drive circuit board 3 and the control circuit board 5 has been mainly described. Second drive circuit board 4-1 of liquid crystal display device 1 according to the invention
And an example of the connection relation between 4-2 and the control circuit board 5 is shown in FIG.
-It demonstrates, referring FIG.

That is, in the above specific example, the second drive circuit boards 4-1 and 4-2 are shown as an example in which they are fixedly connected to the liquid crystal display panel 2. In such an example, the plurality of drive IC groups 41 to 4n provided on the second drive circuit boards 4-1 and 4-2 for driving and controlling the segment electrodes (X electrodes) are, for example, A flexible wiring portion 61, 6 in which a wiring portion composed of a predetermined number of lead patterns obtained by etching a copper foil is formed on a base film made of a polyimide resin.
2 is connected to each of the wiring portions 9 and 10.

The connecting method in such a structure may use an anisotropic conductive adhesive in which conductive particles are mixed in a resin adhesive, or may use solder. Is also good. On the other hand, connector insertion portions 63 and 64 are individually formed at one ends of the flexible wiring portions 61 and 62, and the connector insertion portions 63 and 64 are provided on the control circuit board 5. Also, the second drive circuit board 4
The input and output connector sections 51 and 52 for the -1 and 4-2 control circuit sections can be individually fitted.

Then, as described above and shown in FIG. 2, the control circuit board 5 and the drive circuit board 3 are arranged below the back surface of the liquid crystal display panel 2 in a folded and superposed state. In the pressed state, the second
As shown in FIG. 3, the flexible wiring portions 61 and 62 connected to the drive circuit boards 4-1 and 4-2 are bent or bent to wrap around the lower portion of the back surface of the liquid crystal display panel 2. Control of the second drive circuit boards 4-1 and 4-2 provided on the control circuit board 5 with the connector insertion portions 63 and 64 provided at one end of each of the flexible wiring portions 61 and 62. It is preferable to individually fit the circuit signal input or output connector units 51 and 52.

By adopting such a configuration, it is possible to omit at least the space area portions corresponding to the wiring portions 61 and 62 even in the upper and lower side edge portions of the liquid crystal display panel 2, so that This can largely contribute to the size reduction of the liquid crystal display device 1.

[0031]

Since the liquid crystal display device 1 according to the present invention has the above-mentioned technical structure, the drive circuit board is
Since it can be placed below the back surface of the liquid crystal display panel in a folded state, at least one of the drive circuit boards conventionally arranged around the liquid crystal display panel of the liquid crystal display device. Since the area occupied by the drive circuit board of the liquid crystal display panel can be omitted, the area of the peripheral circuit portion of the liquid crystal display panel can be reduced accordingly, so that the size of the liquid crystal display device as a whole can be reduced. It is possible to reduce the size while maintaining the required size.

Further, in the present invention, since a space can be provided between the adjacent input / output terminals, there is a problem that even if the size is reduced, short-circuiting or disconnection between the input / output terminals is increased or electrode resistance is increased. Therefore, it is possible to obtain a liquid crystal display device that can solve the above problem and improve the packaging yield and reduce the production cost of the product.

[Brief description of drawings]

FIG. 1 is a plan view showing a configuration of a specific example of a liquid crystal display device according to the present invention.

FIG. 2 is a side view showing the configuration of a specific example of the liquid crystal display device according to the present invention.

FIG. 3 is a perspective view showing the configuration of another specific example of the liquid crystal display device according to the present invention.

FIG. 4 is a plan view showing an example of the configuration of a conventional liquid crystal display device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display device 2 ... Liquid crystal display panel 3 ... Drive circuit board, 1st drive circuit board 4-1 and 4-2 ... Segment electrode (X electrode) drive circuit board 31-3n ... Common electrode (Y electrode) drive ICs 41 to 4n ... IC for driving segment electrodes (X electrodes) 5 ... Control circuit board 6 ... Input / output means 7 ... Central processing means 8 ... Peripheral circuit board 9, 10, 11 ... Connection wiring part 30, 50 ... Flexible Connection wiring portion 51, 52 ... Connector portion 61, 62 ... Flexible wiring portion 63, 64 ... Connector insertion portion

Claims (7)

[Claims] 1. A drive circuit board having a liquid crystal display panel and a panel drive IC group arranged around the liquid crystal display panel and driving the panel, and each drive circuit board connected to the drive circuit board. A liquid crystal display device comprising a control circuit board for individually driving and controlling ICs, wherein at least a part of the first drive circuit board is a flexible connection wiring portion. In the liquid crystal display device, the second drive circuit board, which is the remaining drive circuit board, is fixedly connected to the liquid crystal display panel while being connected to the liquid crystal display panel via , The second drive circuit board is connected to an input terminal of each panel drive IC provided on the drive circuit board, and supplies a control signal for individually controlling the drive of each panel drive IC. A flexible and flexible connection wiring portion including connection wiring is connected, and a connector insertion portion is provided at one end of the flexible and flexible connection wiring portion, and the control circuit board has A connector section for outputting a control signal for individually controlling the driving of each panel drive IC provided on the second drive circuit board, and the connector section and the connector insertion section are fitted to each other. A liquid crystal display device characterized by being configured so that they can be connected together. 2. The second drive circuit board is connected to the liquid crystal display panel via a flexible connecting wiring portion which is flexible with respect to the liquid crystal display panel. 1. The liquid crystal display device according to 1. 3. The drive circuit board connected to the liquid crystal display panel through the flexible connection wiring portion is arranged below the back surface of the liquid crystal display panel. The liquid crystal display device according to claim 1 or 2. 4. A fitting connection portion between the connector portion provided on the control circuit board and the connector insertion portion is arranged below a back surface portion of the liquid crystal display panel. The liquid crystal display device according to any one of claims 1 to 3. 5. At least the first of the control circuit boards
2. The control circuit board portion connected to the drive circuit board according to claim 1, is connected to the first drive circuit board via a flexible connecting wiring portion.
5. The liquid crystal display device according to any one of 4 to 4. 6. The drive circuit board connected to the liquid crystal display panel via the flexible connection wiring section, and the flexible connection wiring section to the drive circuit board. 6. The liquid crystal display device according to claim 5, wherein the control circuit board portion connected to the liquid crystal display panel is folded, and the control circuit board portion is arranged below the back surface portion of the liquid crystal display panel in a state of being overlapped with each other. 7. The arrangement structure according to claim 6, wherein the drive circuit board and the control circuit board are arranged in an overlapping manner in a state where the flexible connection wiring portion is bent. Liquid crystal display device.