JP4227622B2 - Structure of liquid crystal display device - Google Patents

Description

  In the present invention, a driving IC chip is fixed to a liquid crystal display element in which two transparent substrates are sealed and bonded together, and one end of a flexible flat cable for external connection is fixed. The structure of a liquid crystal display device of the type

  In a recent liquid crystal display device, when a liquid crystal display element is formed by sealing and bonding two transparent substrates made of glass or the like between them, one of the transparent substrates is transparent to the other transparent substrate. A terminal part that protrudes from the board is integrally provided, and a driving IC chip that is long in the direction perpendicular to the protruding direction of the terminal part is mounted on the surface of the terminal part, and for connection to the outside. One end of the flexible flat cable is fixed so that the flexible flat cable extends in the protruding direction of the terminal portion.

  In this case, conventionally, in order to reduce the width dimension of the terminal portion, that is, the protruding dimension from the other transparent substrate as much as possible, and to reduce the size and weight of the liquid crystal display device, A plurality of connection terminal electrodes, in which the IC chip and one end of the flexible flat cable are arranged side by side in a direction perpendicular to the protruding direction of the terminal portion, and are further connected to the driving IC chip via wiring patterns, respectively. Are arranged in a line along the protruding direction in the terminal portion, and each wiring in the flexible flat cable is electrically connected to each connection terminal electrode.

  However, with such a configuration, the protruding dimension at the terminal portion can be made smaller than when the driving IC chip and one end of the flexible flat cable are aligned and fixed in the protruding direction at the terminal portion. The display device has the advantage that it can be reduced in size and weight, but on the other hand, since the plurality of connection terminal electrodes for the flexible flat cable are arranged in a row in the protruding direction in the terminal portion, each of these connection terminal electrodes is formed. The length of each wiring pattern for connecting between the connection terminal electrode and the driving IC chip is considerably long.

  In this case, each of the wiring patterns is formed of a very thin conductive transparent film in the same manner as the pixel transparent electrode pattern (not shown) in both transparent electrodes. Since it is considerably larger than the wiring in the cable, as described above, when the wiring pattern becomes longer, the resistance value and the impedance from the flexible flat cable to the driving IC chip increase. As a result, the voltage drop becomes considerably large, and noise is generated.

  In addition, as described above, when the connection terminal electrodes are formed in a row in the protruding direction in the terminal portion, both the driving IC chip and one end portion of the flexible flat cable are provided. In the case where the terminal portion is bonded and fixed using an anisotropic conductive adhesive film and electrically connected at the same time, the driving IC chip is bonded and the flexible flat cable is bonded to one end. , Each of them must use a separate anisotropic conductive adhesive film, which not only increases the amount of expensive anisotropic conductive adhesive film used, but also increases the number of steps required to apply this separately. There was also a problem that the cost increased considerably.

The present invention has a technical problem to solve these problems.

In order to achieve this technical problem, the present invention
“One of the two transparent substrates sealed with liquid crystal and bonded together is provided with a terminal part that protrudes from the other transparent substrate. , One end portion of the flexible flat cable extending in the protruding direction in the terminal portion is arranged in a direction perpendicular to the protruding direction in the terminal portion, and the driving IC chip is fixed to the surface of the terminal portion; In the liquid crystal display device, a plurality of wiring patterns for connecting the driving IC chip to the flexible flat cable are formed on the surface of the terminal portion.
A plurality of first connection terminal electrodes formed on the surface of the terminal portion for connecting one end of each wiring pattern to the driving IC chip are connected to the flexible flat of both short sides of the driving IC chip. The short side portion adjacent to the cable side and the one long side of the driving IC chip are arranged so as to be close to the flexible flat cable, and one end of each wiring pattern is attached to the flexible flat cable. A plurality of second connection terminal electrodes formed on the surface of the terminal portion to be connected to each other are arranged in a protruding direction of the terminal portion on a portion of the surface of the terminal portion adjacent to the driving IC chip. while disposed side by side in Jo, closer to the drive IC chip of the left and right sides in the width direction of the one end portion of the flexible flat cable Overlapping a portion on each of the second connecting terminal electrode, this portion only, the relative surface of the terminal portion, an anisotropic conductive adhesive film in each wiring each second connection terminal of the flexible flat cable It is fixed so as to be electrically connected to the electrode, and further, a portion close to the driving IC chip on both the left and right sides in the width direction of the flexible flat cable, and the terminal portion in the longitudinal direction of the flexible flat cable An incision was provided in the part adjacent to . "
It is characterized by that.

  With the configuration described in claim 1, the length of each wiring pattern formed on the surface of the terminal portion can be significantly shortened without greatly changing the protruding dimension of the terminal portion. .

Therefore, according to the present invention, the voltage drop between the flexible flat cable and the driving IC chip can be reliably reduced, and the generation of noise can also be reliably reduced.
In addition, since the flexible flat cable is easily bent at the cut portion, the bending deformation in the portion of the flexible flat cable that extends outward from the terminal portion reaches the fixing portion to the terminal portion, and the fixing is released. Can be reliably reduced.

According to a second aspect of the present invention, the driving IC chip and one end of the flexible flat cable are simultaneously fixed to the terminal using a single anisotropic conductive adhesive film. Therefore, it is possible to reliably avoid an increase in manufacturing cost when an anisotropic conductive adhesive film is used.

  Embodiments of the present invention will be described below with reference to FIGS.

  In this figure, reference numeral 11 denotes a liquid crystal display element in which two transparent substrates 12 and 13 are sealed with liquid crystal sealed therebetween, and one transparent substrate 12 in the liquid crystal display element 11 has the other transparent substrate 12 on the other side. A terminal portion 14 that is appropriately protruded from the transparent substrate 13 by a dimension L is integrally provided.

  Reference numeral 15 denotes an IC chip for driving the liquid crystal display element 11, reference numeral 16 denotes a flexible flat cable for connection to the outside, and the driving IC chip 15 is formed in a rectangular shape. Yes.

  Then, the driving IC chip 15 is placed on the surface of the terminal portion 14, the short side of the rectangle extends in the protruding direction of the terminal portion 14, and the long side of the rectangle is perpendicular to the protruding direction of the terminal portion 14. The flexible flat cable 16 is fixed so that the one end of the flexible flat cable 16 extends in the protruding direction of the terminal portion 14, and is attached to the surface of the terminal portion 14. A plurality of wiring patterns 18 are formed for electrically connecting the driving IC chip 15 to the flexible flat cable 16, and one end of each wiring pattern 18 is connected to the driving IC chip 15. One connection terminal electrode 18 ′ and the other end of each wiring pattern 18 are connected to the flexible flat cable 16. Forming a second connecting terminal electrode 17 for connecting to the definitive each wire.

  Then, the driving IC chip 15 and one end of the flexible flat cable 16 are arranged side by side in a direction perpendicular to the protruding direction of the terminal portion 14, and both of them are formed as one anisotropic conductive film. Using the adhesive film 19, the driving IC chip 15 is connected to each of the first connection terminal electrodes 18 ′, and each of the second connection terminal electrodes 17 of the flexible flat cable 16 is connected to the terminal portion 14. The wiring is fixed so as to be electrically connected to each other.

  In this case, each of the first connection terminal electrodes 18 ′ is connected to the portion of the short side 15 ′ on the flexible flat cable 16 side of the short side of the driving IC chip 15 and one side of the driving IC chip 15. One long side 15 ″ is distributed and arranged in a portion close to the flexible flat cable 16.

On the other hand, each of the second connection terminal electrodes 17 is arranged in a line in the protruding direction of the terminal portion 14 in a portion adjacent to the driving IC chip 15 on the surface of the terminal portion 14. 17 is overlapped with a portion 16A close to the driving IC chip 15 of the left and right sides 16A and 16B in the width direction at one end of the flexible flat cable 16, and only the close portion 16A is placed on the surface of the terminal portion 14. On the other hand, each wiring of the flexible flat cable 16 is fixed by the anisotropic conductive adhesive film 19 so as to be electrically connected to each connection terminal electrode 17.

  Further, the left and right sides 16A and 16B in the width direction of the flexible flat cable 16 are close to the portion 16A close to the driving IC chip 15, and the portion adjacent to the terminal portion 14 in the longitudinal direction of the flexible flat cable 16 is The notch 20 is provided.

  As described above, each first connection terminal electrode 18 ′ at one end of each wiring pattern 18 formed on the surface of the terminal portion 14 is connected to the short side on the flexible flat cable 16 side of both short sides in the driving IC chip 15. 15 ′ and the second long side 15 ″ of the driving IC chip 15 are distributed and arranged in a portion close to the flexible flat cable 16 while each second pattern at the other end of each wiring pattern 18 is arranged. By providing the connection terminal electrodes 17 in a row in the protruding direction of the terminal portion 14, the length of each wiring pattern 18 is significantly shortened without increasing the protruding dimension L of the terminal portion 14. In addition, both of the driving IC chip 15 and one end of the flexible flat cable 16 can be used. And with the terminal 14, it is possible to firmly secured simultaneously using a single anisotropic conductive adhesive film 19.

  Since the flexible flat cable 16 is easily bent at the cut portion 20 by providing the cut portion 20 in the flexible flat cable 16, a portion of the flexible flat cable 16 that extends outward from the terminal portion 14. Thus, it is possible to reliably reduce the influence of the bending deformation on the terminal portion 14 to the fixing portion and the fixing failure.

The cut portion 20 may be provided on both the long side edges 16A and 16B instead of being provided on the one long side edge 16A. However, the cut portion 20 may be provided on one of the long side edges 16A and 16B as illustrated in FIG. When provided on the long side edge (near part) 16A, one end of the flexible flat cable 16 is pressed against the terminal part 14 so as to compress the anisotropic conductive adhesive film 19 sandwiched therebetween. Since the notch portion serves to apply this pressing force only to the one end portion when it is fixed by the cable, it is fixed to the terminal portion at one end portion of the flexible flat cable 16 in an electrically connected state with respect to 14. There is an advantage that it is possible to improve the ease and reliability of

It is a perspective view which shows embodiment of this invention. FIG. 2 is an enlarged sectional view taken along line II-II in FIG. 1. It is a perspective view which shows the state which decomposed | disassembled embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Liquid crystal display element 12, 13 Transparent substrate 14 Terminal part 15 Driving IC chip 15 'Short side of driving IC chip 15 "Long side of driving IC chip 16 Flexible flat cable 16A, 16B Long side edge of flexible flat cable 17 Second connection terminal electrode 18 Wiring pattern 18 ′ First connection terminal electrode 19 Anisotropic conductive adhesive film 20 Cut portion

Claims (2)

A terminal part that protrudes from the other transparent substrate is integrally provided on one of the two transparent substrates sealed with liquid crystal, and an IC chip for driving is provided on the surface of the terminal part. One end portion of the flexible flat cable extending in the protruding direction in the terminal portion is arranged in a direction perpendicular to the protruding direction in the terminal portion, and the driving IC chip is fixed to the surface of the terminal portion. In the liquid crystal display device formed by forming a plurality of wiring patterns for connecting the driving IC chip to the flexible flat cable on the surface of the terminal portion,
A plurality of first connection terminal electrodes formed on the surface of the terminal portion for connecting one end of each wiring pattern to the driving IC chip are connected to the flexible flat of both short sides of the driving IC chip. The short side portion adjacent to the cable side and the one long side of the driving IC chip are arranged so as to be close to the flexible flat cable, and one end of each wiring pattern is attached to the flexible flat cable. A plurality of second connection terminal electrodes formed on the surface of the terminal portion to be connected to each other are arranged in a protruding direction of the terminal portion on a portion of the surface of the terminal portion adjacent to the driving IC chip. while disposed side by side in Jo, closer to the drive IC chip of the left and right sides in the width direction of the one end portion of the flexible flat cable Overlapping a portion on each of the second connecting terminal electrode, this portion only, the relative surface of the terminal portion, an anisotropic conductive adhesive film in each wiring each second connection terminal of the flexible flat cable Further, it is fixed so as to be electrically connected to the electrode, and further, a portion close to the driving IC chip on both the left and right sides in the width direction of the flexible flat cable, and the terminal portion in the longitudinal direction of the flexible flat cable A structure of a liquid crystal display device characterized in that a notch is provided in a portion adjacent to . 2. The liquid crystal according to claim 1, wherein the flexible flat cable and the driving IC chip are fixed to the terminal portion with a common anisotropic conductive adhesive film. The structure of the display device.

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