JPH07254629A - IC chip and connection structure with this IC chip - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the size of liquid crystal display devices and reduce the number of connection points. [Structure] A plurality of common wirings 26 are provided in parallel with each other on the upper surface of a protruding portion protruding from an upper transparent substrate 24 of a lower transparent substrate 25. On the other hand, on the lower surface of the IC chip 22 for driving the liquid crystal display panel 21, a plurality of input terminals 30 are arranged on a straight line inclined with respect to the direction in which the common wiring 26 extends. Then, these input terminals 30 are electrically connected to the corresponding common wirings 26, respectively. In this case, the IC chip 22 is placed on the lower transparent substrate 25.
Since it is directly mounted on the common wiring 26, the size can be reduced and the number of connection points can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an IC chip and a connection structure with the IC chip.

[0002]

2. Description of the Related Art In a liquid crystal display device, for example, an electronic component such as a liquid crystal display panel, a drive circuit IC chip for driving the liquid crystal display panel, and a control circuit circuit board for controlling the IC chip is generally used. Is equipped with.

FIG. 5 shows an example of such a conventional liquid crystal display device. This liquid crystal display device includes a liquid crystal display panel 1, a printed wiring board 2, six TAB tapes 4 on which IC chips 3 are mounted, a circuit board for a control circuit (not shown), and the like. Among them, the liquid crystal display panel 1 is
A liquid crystal (not shown) is sealed between the upper and lower transparent substrates 5 and 6, one end of the lower transparent substrate 6 is projected to the outside of the upper transparent substrate 5, and a plurality of the liquid crystals are provided at predetermined four positions on the upper surface of the projecting portion. A set of connecting terminals 7 is provided, and one end of the upper transparent substrate 5 is projected to the outside of the lower transparent substrate 6, and a plurality of wires are provided at predetermined two locations on the lower surface of the projecting portion. The structure is such that one set of connection terminals 8 is provided. The printed wiring board 2 is substantially L-shaped, and a plurality of segment electrode common wirings 9 and common electrode common wirings 10 are provided on each of the upper surfaces on one side and the other side, although one is shown in the figure. Thus, one end of the common wiring 10 for the common electrode is provided on the lower surface side through the through-hole conducting portion. The printed wiring board 2 is arranged outside two predetermined sides of the liquid crystal display panel 1. A plurality of input terminals (not shown) provided at one end of the lower surface of the predetermined four TAB tapes 4 are electrically connected to the common wiring 9 for the segment electrodes of the printed wiring board 2, respectively, and the other end of the lower surface is provided. A plurality of output terminals (not shown) provided in the section are electrically connected to the connection terminals 7 of the lower transparent substrate 6, respectively. Remaining two TAB tapes 4
Input terminals (not shown) provided on one end of the upper surface of the
Are electrically connected to the common wiring 10 for the common electrode of the printed wiring board 2 respectively, and the plurality of output terminals (not shown) provided at the other end of the upper surface are connected to the connection terminals 8 of the upper transparent substrate 5. Each is electrically connected. Further, a predetermined portion of the printed wiring board 2 is electrically connected to the control circuit circuit board.

[0004]

However, in such a conventional liquid crystal display device, a substantially L-shaped printed wiring board 2 is arranged outside the predetermined two sides of the liquid crystal display panel 1, and both of them are separated by six. Since they are electrically connected via the TAB tape 4, not only the occupying area of the TAB tape 4 and the printed wiring board 2 becomes large and the size becomes large, but also
At least the TAB tape 4 at the connection (bonding) point
In other words, there are problems that the number of IC chips 3 is twice as many as 12 and therefore the number of bonding steps increases and the cost increases. An object of the present invention is to provide an IC chip that can be downsized and can reduce the number of connection points, and a connection structure with the IC chip.

[0005]

The invention according to claim 1 is
I having a plurality of input terminals and a plurality of output terminals on the same surface
In the C chip, at least a part of the output terminal is arranged on one straight line, and the input terminal is arranged on another straight line inclined with respect to the one straight line. Claim 2
In the invention described, a plurality of common wires are provided on one surface in parallel with each other, and a plurality of input terminals are provided on a surface facing the one surface of the board in a direction in which the common wires of the board extend. And an IC chip arranged on a straight line inclined with respect to each other, and each input terminal of the IC chip is electrically connected to each common wiring of the corresponding substrate.

[0006]

According to the present invention, a plurality of common wirings are provided in parallel on one surface of the substrate, and a plurality of input terminals are provided on the surface of the IC chip facing the one surface of the substrate. If they are provided on a straight line inclined with respect to the extending direction and these input terminals are electrically connected to the respective common wirings of the corresponding boards, the IC chip can be directly mounted on the common wirings of the board. Therefore, the size can be reduced and the number of connection points can be reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a liquid crystal display device to which an embodiment of the present invention is applied. This liquid crystal display device includes a liquid crystal display panel 21, six IC chips 22, a flexible wiring board 23, a circuit board for a control circuit (not shown), and the like. Of these, the liquid crystal display panel 21 is formed by enclosing a liquid crystal (not shown) between the upper and lower transparent substrates 24 and 25. One end portion of the lower transparent substrate 25 is projected to the outside of the upper transparent substrate 24, and eight segment electrode common wirings 26 are provided in parallel with each other on the upper surface of the projecting portion, and also at predetermined four positions. Is provided with an output wiring 27 which is a set of eight wires. Also, the upper transparent substrate 2
One end of 4 is projected to the outside of the lower transparent substrate 25, and eight common wirings for common electrodes 28 are provided in parallel with each other on the lower surface of this projection, and eight wirings are provided at predetermined two places. A pair of output wirings 29 are provided. The flexible wiring board 23 is substantially F-shaped and
The protrusions 4 and 25 are arranged near the intersection. The first end 23 of the flexible wiring board 23
a is the common wiring 2 for the segment electrodes of the lower transparent substrate 25
6 is electrically connected to one end, the second end 23b is electrically connected to one end of the common electrode common wiring 28 of the upper transparent substrate 24, and the third end 23c is for the control circuit. It is electrically connected to the circuit board.

As shown in FIGS. 2A and 2B, the IC chip 22 is formed in a planar rectangular shape, and has eight input terminals 30 and eight output terminals 31 on its bottom surface. . That is, the output terminals 31 are arranged at a predetermined interval on a straight line inside the predetermined side of the IC chip 22 and the input terminal 30 is inclined with respect to the straight line on which the output terminal 31 is arranged. Are arranged at predetermined intervals on a straight line. In this case, since each terminal 30, 31 generally has a relatively large area, rather than arranging the input terminal 30 on a straight line orthogonal to the straight line on which the output terminal 31 is arranged,
The IC chip 22 can be made smaller by arranging it on the inclined straight line. Then, the predetermined four IC chips 22 are mounted at predetermined four positions on the upper surface of the protruding portion of the lower transparent substrate 25. That is, as shown in FIGS. 3A and 3B, each input terminal 30 of the IC chip 22 is for segment electrode of the lower transparent substrate 25 through the conductive particles in the anisotropic conductive adhesive 32. Each output terminal 31 is electrically connected to the common wiring 26, and each output terminal 31 is connected to the output wiring 2 of the lower transparent substrate 25 via conductive particles in the anisotropic conductive adhesive 32.
7 are electrically connected to each. In this case, IC
Since each input terminal 30 of the chip 22 is arranged on a straight line inclined with respect to the direction in which the segment electrode common wiring 26 extends, the pitch between the segment electrode common wirings 26 can be reduced, and as a result, Side transparent substrate 25
The amount of protrusion of the protrusion can be reduced, and therefore the lower transparent substrate 25 can be downsized as a whole. Similarly, the remaining two IC chips 22 are mounted at two predetermined positions on the lower surface of the protruding portion of the upper transparent substrate 24. Also in this case, the lower transparent substrate 25 described above
Similarly, the upper transparent substrate 24 can be downsized as a whole. As a result, the entire liquid crystal display panel 21 can be downsized. The electrical connection of the IC chip 22 is not limited to the anisotropic conductive adhesive 32, but may be an electrical connection by the solder bump 33 as shown in FIG.

As described above, in this liquid crystal display device, the plurality of common wirings 26 and 28 are provided in parallel with each other on the protruding portions of the transparent substrates 24 and 25, and the common wirings 26 and 28 are provided to the protruding portions of the transparent substrates 24 and 25 of the IC chip 22. Multiple input terminals 3 on opposite sides
Since 0 is provided on a straight line that is inclined with respect to the direction in which the common wirings 26 and 28 extend and these input terminals 30 are electrically connected to the respective common wirings 26 and 28 of the corresponding transparent substrates 24 and 25, Common wiring 2 of transparent substrates 24 and 25
The IC chip 22 can be directly mounted on the 6, 28. As a result, since it is not necessary to use the TAB tape and the common wirings 26 and 28 are not required to be provided on the flexible wiring board 23, the flexible wiring board 23 can be miniaturized as much as possible, and therefore the entire device can be made. It can be miniaturized. Also, the connection point is the IC chip 2
2 of the connection between 2 and the transparent substrates 24 and 25 and 2 of the connection between the transparent substrates 24 and 25 and the flexible wiring substrate 23.
There are a total of 8 locations, which can be reduced from 12 locations in the conventional case. Therefore, the number of bonding steps can be reduced by that amount, and the cost can be reduced.

In the above embodiment, the IC chip 22 has eight input terminals 30 and eight output terminals 31, but the number of input terminals and the number of output terminals may be larger or smaller than this value. Good. Further, the number of input terminals and the number of output terminals may not be the same. Further, in the above embodiment, all the output terminals 31 of the IC chip 22 are arranged on one straight line, but the present invention is not limited to this, and for example, a part of the output terminal 31 is arranged on one straight line as in the above embodiment. And the rest may be arranged on a straight line extending from one end of the one straight line in a direction orthogonal to the straight line. Further, the present invention is not limited to the liquid crystal display device, and it is needless to say that the present invention can be applied to other electronic devices provided with a substrate having a similar wiring structure.

[0011]

As described above, according to the present invention, a plurality of common wirings are provided in parallel on one surface of a substrate, and a plurality of common wirings are provided on the surface of the IC chip facing the one surface of the substrate. When the input terminals are provided on a straight line that is inclined with respect to the direction in which the common wiring of the board extends and these input terminals are electrically connected to the respective common wirings of the corresponding boards, the IC chip is formed on the common wiring of the board. Can be mounted directly,
Therefore, the size can be reduced, the number of connecting points can be reduced, the number of bonding steps can be reduced, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view of a liquid crystal display device to which an embodiment of the present invention is applied.

2A is a bottom view of an IC chip used in the liquid crystal display device, and FIG. 2B is a side view thereof.

3A is a detailed view of a part of FIG. 1, and FIG.
-A sectional view taken along line B.

FIG. 4 is a diagram showing another example of electrical connection of IC chips.
(B) The same sectional view.

FIG. 5 is a plan view of a conventional liquid crystal display device.

[Explanation of symbols]

 21 liquid crystal display panel 22 IC chip 23 flexible wiring board 24, 25 transparent substrate 26, 28 common wiring 27, 29 output wiring 30 input terminal 31 output terminal 32 anisotropic conductive adhesive 33 solder bump

Claims (2)

[Claims] 1. An IC chip having a plurality of input terminals and a plurality of output terminals on the same surface, wherein at least a part of the output terminals are arranged on one straight line,
An IC chip, wherein the input terminal is arranged on another straight line inclined with respect to the one straight line. 2. A substrate having a plurality of common wirings provided on one surface in parallel with each other, and a plurality of input terminals on a surface facing the one surface of the substrate in a direction in which the common wirings of the substrate extend. And an IC chip arranged on a straight line inclined with respect to each other, wherein each input terminal of the IC chip is electrically connected to each common wiring of the corresponding substrate, connection with the IC chip Construction.