JPH11212481A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid connection defects in a circuit board. SOLUTION: In a liquid crystal display device, plural signal electrodes and scan electrodes are arranged like a matrix in a liquid crystal display panel 1, and a display signal from a signal-side circuit board 2 is supplied to signal electrodes and a scan signal from a scan-side circuit board is supplied to scan electrodes to drive the liquid crystal. In this case, the signal-side circuit board 2 is divided into plural parts and is provided with a connection member 4 which electrically connects a divided circuit board 2a and a divided circuit board 2b, and elongation generated for heat connection per divided circuit board is reduced to 1/(the number of divided circuit boards).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to various types of information equipment,
The present invention relates to a liquid crystal display device used as a display unit of a V device and an advertising display.

[0002]

2. Description of the Related Art As shown in FIGS. 7 and 8, a conventional liquid crystal display device has a liquid crystal display panel 31 in which a plurality of signal electrodes and a plurality of scanning electrodes are arranged in a matrix so as to face each other.
And a signal side circuit board 32 on which a drive circuit (not shown) for supplying a display signal to the liquid crystal display panel 31 is mounted.
32, and a scanning circuit board 33 on which a drive circuit (not shown) for supplying a scanning signal to the liquid crystal display panel 31 is mounted.

When an external input signal such as an image signal is supplied to the signal side circuit board 32 and the scanning side circuit board 33, the scanning signal is transmitted from the scanning side circuit board 33 to the liquid crystal display panel 31 via the flexible circuit board 36a. And the display signal is supplied to the flexible circuit board 3.
6b to the liquid crystal display panel 3 from the signal side circuit board 32.
The signal is supplied to one signal electrode.

The wiring pattern and shape of the signal side circuit board 32 are vertically symmetrical with respect to the liquid crystal display panel 31, as shown in FIGS. The scanning-side circuit board 33 is disposed so that its longitudinal direction is orthogonal to the longitudinal direction of the signal-side circuit board 32.
And the scanning side circuit board 33 are connected to a jumper connector 35.
They are connected to each other by 35.

The signal-side circuit board 32 and the scanning-side circuit board 33 have, for example, a multilayer structure as shown in FIG. 11, and a glass epoxy resin 43 or a prepreg 44 is provided between copper foils 42. The surface is coated with a resist film 41.

The copper foil 42 is coated on a glass epoxy resin 43, the thickness is 0.045 μm, and the thickness of the copper foil 42 coated on both sides of the prepreg 44 is 0.03 μm. The thickness is set to (0.6 ± 0.15) mm.

The copper foils 42 are electrically connected by through holes (not shown), and the resist films 41 are removed from the connection terminals (not shown) on the surface.

When the conventional circuit board having the above structure is a single long circuit board, the circuit board is stretched or warped by heat because of a structure in which a plurality of layers of materials having different coefficients of thermal expansion are sandwiched and fixed. Occurs.

The manufacturing flow is as follows. After the connecting portion of the flexible circuit board 36b is aligned with the electrode of the liquid crystal display panel 31 via the anisotropic conductive film (not shown), the connection of the flexible circuit board 36b is performed. Connect the crimping tool to the part. The temperature of the crimping tool at that time is
It is set at 180 ° C to 200 ° C.

By the way, since the flexible circuit board can be connected to an external board at a time, increases the degree of freedom in arranging the external board, and can realize a compact product, it can be used as a connector or as a semiconductor element. As a hybrid board on which electronic components are mounted, it is widely used for mounting cameras, calculators, watches, liquid crystal display panels, and the like. The connection between the flexible circuit board and the external board is performed by soldering, heat sealing, anisotropic conductive film (300 μm).
(m pitch or less).

However, when a flexible circuit board having a small conductive pattern pitch and a liquid crystal display panel are connected via an anisotropic conductive film, the insulating resin of the flexible circuit board and the liquid crystal display panel are heated to 150 ° C. or lower by a heating tool. Heat to 200 ° C. Therefore, both thermally expand. In this case, since the thermal expansion coefficients of the two are different from each other, a shift occurs between the conductive pattern on the flexible circuit board and the conductive pattern on the liquid crystal display panel, and the overlapping portion of the two patterns becomes small, and after the completion of thermocompression bonding. The deviation is also maintained. Therefore, it is extremely difficult to accurately connect the flexible circuit board and the liquid crystal display panel. This is particularly remarkable when the conductive pattern pitch is 100 μm or less and the width of the collective connection portion of the flexible circuit boards to be collectively connected exceeds 10 mm. In this case, stable connection becomes impossible.

Therefore, as a technique for overcoming the deviation between the conductive patterns caused by heating, for example, Japanese Patent Laid-Open No. 3-108789 is known. According to this publication, as shown in FIG. 9, the driving IC 54 is extended to a conductive pattern (not shown) on the flexible circuit board 51 via a bump (not shown) by a collective connection called a TAB method. It is connected to a lead (not shown). This flexible circuit board 51 is connected to a liquid crystal display panel 59 at a joint 52. The flexible circuit board 51 is made of an insulating resin, and the insulating resin is provided with a slit 56 in parallel with the conductive pattern. By providing the slit 56, the expansion of the insulating resin of the flexible circuit board 51 is reduced, and the flexible circuit board 51 and the liquid crystal display panel 59 are connected via the conductive pattern.

The above publication also discloses a connection between a flexible circuit board 63 and another board 61, as shown in FIG. 10. On the flexible circuit board 63, active components 64 such as ICs, resistors and capacitors are provided. The flexible circuit board 63 is connected to another board 61 at the joint 62 by thermocompression bonding. The flexible circuit board 63 is made of an insulating resin, and the insulating resin is provided with a plurality of slits 66 in parallel with a conductive pattern (not shown). By providing these slits 66, the expansion of the insulating resin of the flexible circuit board 63 is reduced, and the flexible circuit board 63 and the separate board 61 are connected via the conductive pattern.

[0014]

However, the prior art described in Japanese Patent Application Laid-Open No. 3-108789 has the following problems.

That is, the flexible circuit board 51 (6
By providing slits 56 (66) in the insulating resin of 3), the expansion of the flexible circuit board itself caused by heat is reduced, but the expansion of the liquid crystal display panel 59 (separate substrate 61) caused by heat is reduced. Not considered at all. That is, the flexible circuit board 5 disclosed in the above publication
1 (63) and a long liquid crystal display panel 59 (another substrate 61)
Is connected by thermocompression bonding, the liquid crystal display panel 5
9 (separate board 61) is shifted from the connection position of flexible circuit board 51 (63).

For example, in the case of the example shown in FIG.
1 has a coefficient of thermal expansion of 9.7 × 10 ⁻⁵ / ° C. (the other substrate 61 extends 97 μm per cm), and the coefficient of thermal expansion of the flexible circuit board 63 is 2.0 × 10 ⁻⁵ / ° C. (flexible per cm). The circuit board 63 extends 20 μm).
A deviation of (97 μm−20 μm) = 77 μm per m will occur. When the deviation due to the difference in the thermal expansion coefficient is accumulated, the area of the overlapping portion of the two conductive patterns is further reduced, so that a load is imposed on the connecting portion and the disconnection is caused.

In the case of the prior art shown in FIGS. 7 and 8, the longer the lengths of the scanning circuit board 33 and the signal circuit board 32 are, the greater the positional deviation due to the heat-induced extension is, and the jumper connector. It becomes difficult to make connections by 35.35. Moreover, the longer the length of the circuit board,
The influence due to the warpage due to heat is also increased, and the occurrence rate of defects such as poor connection is increased accordingly.

In addition, if a failure occurs in the circuit board after connection, it is necessary to replace the defective circuit board. In this case, the entire circuit board must be replaced, so the mounting process In this case, a man-hour loss occurs. In particular, in the case of a large model employing a flexible circuit board (for example, a large-screen liquid crystal display device, etc.), the length of the circuit board becomes long. Since the flexible circuit board must be removed, the number of steps is increased accordingly.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a liquid crystal display device capable of avoiding a connection failure in a circuit board.

[0020]

According to a first aspect of the present invention, there is provided a liquid crystal display device having a plurality of signal electrodes and a plurality of scanning electrodes arranged in a matrix in a liquid crystal display panel. In a liquid crystal display device that drives a liquid crystal by supplying a display signal from a signal side circuit board to the signal electrode and supplying a scan signal from a scanning side circuit board to the scan electrode, the following measures have been taken. It is characterized by.

That is, in the liquid crystal display device described above, at least the signal side circuit board of the circuit board is divided into a plurality of parts, and a connection member for electrically connecting the divided circuit boards is provided.

According to the above arrangement, an input signal such as an image signal to be displayed is externally supplied to the signal side circuit board and the scanning side circuit board. The signal-side circuit board and the scanning-side circuit board generate a display signal and a scan signal based on the input signal, and supply them to the signal electrode and the scan electrode in the liquid crystal display panel, respectively. The liquid crystal is driven based on the display signal and the scanning signal, and a display according to the input signal is performed.

The signal-side circuit board and the scanning-side circuit board are respectively connected to the liquid crystal display panel by a heating tool or the like. During this heating, each of these circuit boards and the liquid crystal display panel expands due to thermal expansion. However, since their thermal expansion coefficients are different from each other, each circuit board and the liquid crystal display panel are connected in a shifted state, Even after the termination, such a deviation remains.

However, in the structure of the first aspect, at least the signal side circuit board of the circuit board is divided into a plurality of parts, so that the elongation due to the heating of the circuit board is distributed to the plurality of divided circuit boards. Will be. That is, the elongation per one divided circuit board is reduced to (1 / the number of divided circuit boards) as compared with the case where one divided circuit board is used.

Further, since the divided circuit boards are electrically connected to each other by the connecting members, the electrical performance is maintained as in the case where each board is composed of one board.

According to a second aspect of the present invention, there is provided a liquid crystal display device according to the first aspect, wherein the connection member is covered with a flexible insulating resin. It has a configuration.

According to the above configuration, in addition to the operation of the first aspect, the connection member is covered with the insulating resin. Sex is preserved. In addition, since the connection member has flexibility, the degree of freedom in arranging the connection member and each divided circuit board is significantly increased.

According to a third aspect of the present invention, there is provided a liquid crystal display device according to the first or second aspect, wherein the connection member is a flexible circuit board in each of the circuit boards. (A non-mounting surface of the flexible circuit board) opposite to the mounting surface.

According to the above configuration, in addition to the function of the first or second aspect, the connection member is provided on the surface of each of the circuit boards opposite to the mounting surface of the flexible circuit board. Therefore, each space of the mounting surface and the non-mounting surface of the flexible circuit board in each circuit board is effectively used.

According to a fourth aspect of the present invention, there is provided a liquid crystal display device according to the first, second, or third aspect of the invention, wherein the connecting member and the divided circuit board are provided in a plurality. Each having a terminal portion with a terminal,
When the corresponding terminal portions are connected to each other, the divided circuit boards are electrically connected to each other, and the terminal portions include a dummy terminal.

According to the above construction, the first, second or third aspect of the present invention is provided.
In addition to the operation of the configuration described above, the connection members and the divided circuit boards are electrically connected to each other by connecting the corresponding terminal portions. Also,
Since the terminal portion includes the dummy terminal, the strength of the interconnection between the divided circuit boards is improved accordingly.

According to a fifth aspect of the present invention, there is provided a liquid crystal display device according to the fourth aspect, wherein the terminal portion of the connecting member and the terminal portion of the divided circuit board are formed as follows. A configuration in which the divided circuit boards are provided linearly in a substantially longitudinal direction, and the terminal portions of the connection members are internally wired in a U-shape so that terminals of adjacent divided circuit boards correspond to each other. have.

According to the above construction, in addition to the function of the construction of the fourth aspect, since each terminal portion is provided linearly in the substantially longitudinal direction of the divided circuit board, the work of solder connection is processed linearly. Work efficiency is improved. Further, since the terminal portions of the connection members are internally wired in a U-shape, the layout of the wiring on each divided circuit board can be easily designed.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention relates to a large-screen liquid crystal display device, which will be described below with reference to FIGS.

FIG. 1 is a front view of a liquid crystal display element provided in the liquid crystal display device according to the present embodiment.
One signal side circuit board 2 and one scanning side circuit board 3
Are connected via a flexible circuit board 6b (see FIG. 2) and a flexible circuit board 6a, respectively, and the scanning side circuit board 3 and the signal side circuit board 2.2 are electrically connected to each other by jumper connectors 5.5. It has become.

Each signal side circuit board 2 is divided into a plurality. For example, FIG. 2 shows a case where each signal-side circuit board 2 is divided into a divided circuit board 2a and a divided circuit board 2b. FIG. 2 is a rear view of the liquid crystal display device of FIG.

The signal-side circuit board 2 and the scanning-side circuit board 3 are connected to the liquid crystal display panel 1 by a heating tool or the like, respectively. Each of these substrates and the liquid crystal display panel 1 extend by thermal expansion. In this case, since both have different coefficients of thermal expansion, each circuit board and the liquid crystal display panel 1 are connected in a shifted state, and such a shift remains after the completion of the thermocompression bonding.

However, in this embodiment, since the signal side circuit board 2 is divided into a plurality as described above,
The elongation resulting from the heating is distributed to the plurality of divided circuit boards, and is reduced to (1 / the number of divided circuit boards) as compared with the case where the signal side circuit board 2 is formed of one board. Therefore,
The overlapping portion at the connection portion is sufficiently ensured, and disconnection at the connection portion can be reliably prevented. In addition, the influence due to the warpage due to heat is also reduced by dividing the circuit board into a plurality of parts, compared to the case where the circuit board is composed of one board, and the occurrence rate of defects (such as poor connection) due to the warpage of the board is reduced. It can be kept low.

In addition, when a defect occurs in the divided circuit board after connection and the defective circuit board is replaced, it is not necessary to replace the entire circuit board as in the related art, and it is necessary to deal with the place where the failure has occurred. Since only the divided circuit board need be replaced, a normal divided circuit board can be used as it is,
Replacement man-hours can be greatly reduced. Therefore, cost reduction becomes possible.

The divided circuit board 2a and the divided circuit board 2b are electrically connected by a connecting member 4.
As shown in FIG. 1, the connection member 4 is provided on a surface of each signal-side circuit board 2 opposite to the mounting surface of the flexible circuit board 6b (non-mounting surface of the flexible circuit board 6b).

By providing the connection member 4 as described above, the mounting area on the mounting surface side of the flexible circuit board 6b in the divided circuit boards 2a and 2b can be reduced.
That is, the width of the divided circuit boards 2a and 2b (the width in the direction perpendicular to the longitudinal direction) is reduced, so that the frame of the liquid crystal display device can be narrowed. Thus, in the present embodiment, in each of the divided circuit boards 2a and 2b, the surface opposite to the mounting surface of the flexible circuit board 6b is effectively used.

FIG. 3 shows a state before connection of the jumper connectors 5.5 connecting the signal side circuit board 2 and the scanning side circuit board 3 and the connection member 4 connecting the divided circuit boards in FIG. It shows. When the connection member 4 is connected by soldering, the connection terminal pads 8a and 8b (see FIG. 3) of the divided circuit boards 2a and 2b and the terminal 1 of the connection member 4
1a and 11b (see FIG. 4) are connected to each other, whereby the divided circuit boards 2a and 2b are electrically connected to each other.

FIG. 4 shows the structure of the connecting member 4, and as shown in FIG. 4B, the inside of the connecting member 4 is wired in a U-shape. In this way, by arranging the wires 9 so that the wires 9 do not cross each other, it is possible to have a margin in the pitch of the terminal portions 11a and 11b of the connection member 4 (the pitch can be set to about 1.0 mm) and to divide The layout of the connection terminal pads 8a and 8b on the circuit boards 2a and 2b can be easily performed, and the wiring space can be rationalized.

The terminal portions 11a and 11 of the connecting member 4
b (T1 to T2 in FIG. 4B)
(26 terminals of No. 6) includes the dummy connection terminal, thereby remarkably strengthening the connection and improving the reliability of the device. The dummy connection terminal itself does not contribute to the propagation of the electric signal, but contributes to strengthening the connection between the divided circuit boards.

The reliability of the connection improves as the number of dummy connection terminals increases. For example, dummy connection terminals are provided every other wiring terminal (for example, in FIG. 4B, T2, T4,...). , T24, and T26 as dummy connection terminals), the noise resistance is improved, the distance between the wirings can be secured, and the connection reliability can be significantly enhanced.

The wiring 9 of the connection member 4 employs a multilayer structure (for example, a two-layer structure) not shown. As a result, even if one layer is disconnected, the connection is maintained in the remaining layers, the reliability of the wiring is improved, and the wiring can have a margin.

The outside of the connection member 4 is covered with an insulating resin such as a polyimide resin. As a material of the wiring 9,
A copper foil is used, and these wirings 9 are formed in a U-shape and do not intersect with each other, maintaining a predetermined interval via an acrylic resin adhesive member.

The acrylic resin adhesive member and the copper foil are both thin, and the polyimide resin has flexibility, so that the degree of freedom of arrangement on the circuit board is increased, and space is saved by bending or the like. Can be achieved.

In FIG. 3, when the connection terminal pad 8a and the connection terminal pad 8b are connected, since the outside of the connection member 4 is covered with a flexible insulating resin, even if a slight displacement occurs in mounting. , Can ease it. That is, due to its flexibility, reconnection can be freely performed, and connection without deviation can be performed. In addition, since the outside is covered with a flexible insulating resin, even if the divided circuit board is touched, the worst case such as a short circuit can be reliably avoided.

The adhesive member 10 shown in FIG. 4 is provided for temporarily fixing the connecting member 4 on the circuit board when connecting the connecting member 4 in the state shown in FIG. After temporary fixing in this way, soldering connection is performed to complete the connection process.
Although a double-sided tape is used as the adhesive member 10,
This is because, when the flexible circuit board 6b is temporarily fixed on the divided circuit board, the flexible circuit board 6b is easily peeled off, so that it can be easily redone any number of times, and furthermore, the mounting stability and the impact resistance can be improved. preferable.

Further, by covering the connection member 4 with a translucent resin (an insulating resin such as a polyimide resin is also translucent), it is possible to immediately visually check whether or not the wiring is disconnected in the resin. It is possible to make a determination, and it is possible to reliably prevent a defective product of the connection member 4 from being used for connection.

Here, the outline of the mounting of the liquid crystal display device according to the present embodiment will be described with reference to FIGS. FIG.
1 is an exploded perspective view showing a structure of a liquid crystal display device according to the present embodiment. As shown in FIG. 5, the liquid crystal display element 13 having the above-mentioned configuration is placed on the backlight 14, and the upper bezel 12 is put on the liquid crystal display element 13 from above, and as shown in FIG. (Bent inward) to hold the inside.

According to the present embodiment, the signal side circuit board 2
The connection member 4 is provided on one side (the surface opposite to the mounting surface of the flexible circuit board 6b), but the present invention is not limited to this, and the space on the circuit board may be sufficient. For example, the space on both surfaces of the signal-side circuit board 2 (both the mounting surface and the non-mounting surface of the flexible circuit board 6b) may be used as the installation location of the connection member 4. In this case, as compared with the case where the connection member 4 is provided only on one side, the connection is further strengthened, and the reliability of the liquid crystal display device is significantly improved.

In the manufacturing flow, after the flexible circuit board 6b is crimped to the glass terminal (not shown) of the liquid crystal display panel 1, the signal input terminal (not shown) of the flexible circuit board 6b and the divided circuit board 2a ( 2b). Then, the divided circuit board 2a and the divided circuit board 2b are connected by soldering the connection member 4.

As described above, by dividing the signal-side circuit board 2 into a plurality of parts, even if a board failure occurs, only the defective divided board needs to be partially replaced. It is not necessary to replace the entire board, and loss of man-hours in the mounting process can be reliably avoided. Also,
In the case of a large model that uses a flexible circuit board (for example, a large-screen liquid crystal display device), it is possible to remove one row of connected flexible circuit boards when replacing a circuit board due to a defect, as in the past. Since it becomes unnecessary, the number of man-hours is greatly reduced.

In the present embodiment, for convenience of explanation, the case where only the signal side circuit board 2 is divided into a plurality is described, but the present invention is not limited to this, and the liquid crystal display device is mounted. Depending on the device (model) of the destination, both the signal side circuit board 2 and the scanning side circuit board 3 may be divided into a plurality. The description of the case where the scanning side circuit board 3 is divided into a plurality of parts is essentially the same as the case where the signal side circuit board 2 is divided into a plurality of parts, and thus a detailed description will be omitted.

Further, in the present embodiment, the case where the number of divisions is 2 is exemplified for convenience of explanation, but the present invention is not limited to this. As the number of divisions increases, the elongation per divided circuit board due to heating decreases, but the configuration becomes more complicated, and therefore the device (model) on which the liquid crystal display device according to the present invention is mounted. In consideration of the above, the optimum number of divisions may be determined for each device.

[0058]

As described above, in the liquid crystal display device according to the first aspect of the present invention, at least the signal side circuit board is divided into a plurality of circuit boards, and the divided circuit boards are electrically connected to each other. It has a configuration provided with a connection member.

Therefore, the elongation due to the heating of the signal side circuit board and the scanning side circuit board is distributed to a plurality of divided circuit boards, respectively, and is smaller than that of the case where only one board is used.
Since it is reduced to (1 / number of divided circuit boards), the overlapping portion at the connection portion is sufficiently ensured, and disconnection at the connection portion can be reliably prevented. In addition, the influence due to the warpage due to heat is smaller than in the case of a single substrate, so that the occurrence rate of defects (such as poor connection) due to the warpage of the substrate can be reduced.

In addition, when a defective circuit board is connected and the defective circuit board is replaced, it is not necessary to replace the entire circuit board as in the prior art, and only the divided circuit board on which the defect has occurred is required. , The cost can be reduced, resources can be effectively used, and the number of steps required for substrate replacement can be greatly reduced.

Further, even if each circuit board is divided, the connection members are provided, so that the electric performance can be maintained.

As described above, the liquid crystal display device according to the second aspect of the present invention has a configuration in which the connection member is covered with a flexible insulating resin in the liquid crystal display device according to the first aspect. ing.

Therefore, in addition to the effect of the first aspect, the connection member is covered with the insulating resin.
Insulation with each circuit board is maintained. In addition, since the connection member has flexibility, the worst case of short-circuiting by contact with each circuit board (including electronic components mounted on the board) can be reliably avoided, and the connection member can be prevented. In addition, there is an effect that the degree of freedom of arrangement of the divided circuit boards can be significantly increased.

As described above, in the liquid crystal display device according to the third aspect of the present invention, in the liquid crystal display device according to the first or second aspect, the connection member is formed on each of the circuit boards by a mounting surface of a flexible circuit board. Has a configuration provided on the opposite surface.

Therefore, in addition to the effects of the first and second aspects, the connection member is provided on the non-mounting surface of the flexible circuit board in each circuit board, so that the flexible circuit board in each circuit board is not mounted. The space on the mounting surface and the space on the non-mounting surface can be effectively used, and the mounting area on each substrate can be small, so that the width of each substrate (each divided substrate) can be reduced and the frame of the liquid crystal display device can be narrowed. It also has the effect that can be done.

As described above, a liquid crystal display device according to a fourth aspect of the present invention is the liquid crystal display device according to the first, second, or third aspect, wherein the connection member and the divided circuit board have a plurality of terminals. Each of the divided circuit boards has a terminal portion, and the corresponding terminal portions are connected to each other to electrically connect the divided circuit boards, and the terminal portion includes a dummy terminal.

Therefore, in addition to the effects of the first, second, or third aspect, since each terminal portion includes a dummy terminal, the strength of the interconnection between the divided circuit boards is improved, and the liquid crystal display device is improved. Has an effect that the impact resistance can be surely improved.

As described above, a liquid crystal display device according to a fifth aspect of the present invention is the liquid crystal display device according to the fourth aspect, wherein the terminal portion of the connecting member and the terminal portion of the divided circuit board are connected to the divided circuit board. And the terminal portions of the connection members are internally wired in a U-shape so that the terminals of the adjacent divided circuit boards correspond to each other. I have.

Therefore, in addition to the effect of the configuration of claim 4, since each terminal portion is provided linearly in the substantially longitudinal direction of the divided circuit board, work efficiency at the time of solder connection is improved, and mounting is performed. Overall work efficiency can be increased. Also,
Since the terminal part of the connection member is internally wired in a U shape,
The arrangement of wiring on each divided circuit board can be easily designed, and the arrangement of each divided circuit board can be easily designed.

[Brief description of the drawings]

FIG. 1 is a front view of a liquid crystal display element provided for a liquid crystal display device of the present invention.

FIG. 2 is a rear view of the liquid crystal display device of FIG.

FIG. 3 is an explanatory diagram showing a state before a jumper connector for connecting a signal side circuit board and a scanning side circuit board and a connection member for connecting divided circuit boards are connected in the liquid crystal display element of FIG. 1; .

4A is an explanatory view showing a connecting member for connecting the divided circuit boards of FIG. 1, and FIG. 4B is an explanatory view showing an internal wiring of the connecting member.

FIG. 5 is an exploded perspective view of the liquid crystal display device of the present invention.

FIG. 6 is an enlarged view of a main part of FIG. 5;

FIG. 7 is a front view of a conventional liquid crystal display device.

FIG. 8 is a rear view of FIG. 7;

FIG. 9 is an explanatory diagram showing a conventional technique for overcoming a deviation between conductive patterns caused by heating.

FIG. 10 is an explanatory view showing another conventional technique for overcoming a deviation between conductive patterns caused by heating.

FIG. 11 is an explanatory diagram showing a configuration example of a conventional circuit board.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 2 Signal side circuit board 2a Divided circuit board 2b Divided circuit board 3 Scanning circuit board 4 Connection member 5 Jumper connector 6a Flexible circuit board 6b Flexible circuit board 8a Connection terminal pad 8b Connection terminal pad 9 Wiring 10 Adhesive member 11a Terminal 11b Terminal

Claims (5)

[Claims] A plurality of signal electrodes and a plurality of scanning electrodes are arranged in a matrix in a liquid crystal display panel, and display signals from a signal side circuit board are supplied to the signal electrodes and scanning from the scanning side circuit board is performed. In a liquid crystal display device for driving a liquid crystal by supplying a signal to the scanning electrode, at least a signal side circuit board of the circuit board is divided into a plurality of parts, and a connection member for electrically connecting the divided circuit boards is provided. A liquid crystal display device comprising: 2. The liquid crystal display device according to claim 1, wherein said connection member is covered with a flexible insulating resin. 3. The liquid crystal display device according to claim 1, wherein the connection member is provided on a surface of each of the circuit boards opposite to a mounting surface of the flexible circuit board. 4. The connection member and the divided circuit board each have a terminal portion having a plurality of terminals, and the divided circuit boards are electrically connected to each other by connecting the corresponding terminal portions. 4. The liquid crystal display device according to claim 1, wherein said terminal portion includes a dummy terminal. 5. The terminal portion of the connection member and the terminal portion of the divided circuit board are provided linearly in a substantially longitudinal direction of the divided circuit board, and the terminal portions of the connection member are adjacent to each other. 5. The liquid crystal display device according to claim 4, wherein internal wiring is formed in a U-shape so that terminals of the circuit board correspond to each other.