JPH0643472A - Circuit connecting unit - Google Patents

Abstract

PURPOSE:To obtain the circuit connecting unit having an effect of miniaturization and profitability by forming a flexible connecting substrate for constituting the circuit connecting unit to a shape for taking it out economically from a raw material of a rectangular flexible substrate, and also, avoiding waste in the periphery of a display screen of a liquid crystal display body being an instance of body to be connected for constituting the circuit connecting unit. CONSTITUTION:In an electronic device for connecting a first circuit unit, and a second circuit unit having an X electrode and a Y electrode to be connected to the face in the vertical direction, respectively, by using a flexible connecting substrate, the circuit connecting unit is constituted by forming a connecting part of an X electrode part 22 and a Y electrode part 23 of a flexible connecting substrate 20 on a roughly straight line, and also, fetching a first circuit unit in parallel to the X electrode part 22 or the Y electrode part 23 and forming an electrode, and also, bending a part of the flexible connecting substrate 20 and forming it to a right angle arranged shape in which the X electrode part 22 and the Y electrode part 23 are positioned roughly at a right angle to each other, and connecting the flexible connecting substrate 20 of the right angle arranged shape and a body to be connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substrate on which electrodes are arranged substantially at right angles such as the X-axis direction and the Y-axis direction, and a connection substrate for transmitting electric signals from the substrate and a separate substrate. And a circuit unit having the separate substrate, for connecting a display electrode of a liquid crystal display device to a circuit for controlling or driving the display formed separately from the display, etc. And a circuit connecting unit in which a display member, a connecting member and a control circuit are integrated.

[0002]

2. Description of the Related Art Plasma display devices, liquid crystal display devices and the like are available as means for optically displaying electrical signals, but these display devices require a circuit for controlling the display portion, and the display portion. Need a circuit to drive the.
These circuits are generally separated from the display unit, but the circuit for driving the display unit may be formed integrally with the display unit. Therefore, a means for connecting the display section and the circuit section is required. As this means, a flexible connection board, which is a board that can be freely deformed and is easily mass-produced, is used.

As an example of the second circuit unit, an X electrode is generally provided in the X-axis direction and a Y electrode is provided in the Y-axis direction at the end portion of the display section of the display device. An X electrode flexible substrate and a Y electrode flexible substrate are arranged along the X electrode and the Y electrode of the display unit, and the connecting electrodes of each flexible substrate and the X electrode and the Y electrode of the display unit are anisotropically conductively bonded. Connection is made through a conductive means such as an agent. Further, the first circuit unit connecting portion provided at the end of each of the flexible substrates for the X electrodes and the Y electrodes is flexible with the first circuit unit which is a control circuit unit of the display unit which is separated from the display unit. It is configured to connect the connection board.

A conventional example will be shown with reference to FIG. 8 disclosed in Japanese Patent Laid-Open No. 1-235922. Second in FIG.
In the liquid crystal display body which is an example of the circuit unit 10, two upper and lower glass substrates having electrodes formed on one surface are opposed to each other, the liquid crystal is sandwiched in this gap, and the periphery of the sandwiched liquid crystal is sealed. The display unit 11 is formed of a liquid crystal part, which is made of a sealing material. Further, a driving IC for driving the liquid crystal is mounted on the end portions of the upper and lower glass substrates, and the display unit 11 is provided in order to provide electrodes for connecting with the flexible connection substrate 20.
The glass substrate is formed to be larger than the outer circumference. In FIG. 8, the lower glass substrate is a Y electrode 13 which is an electrode in the Y-axis direction.
And the upper glass substrate forms an X electrode 12 which is an electrode in the X-axis direction. X of the second circuit unit 10
In order to electrically connect the electrode 12, the Y electrode 13, and the first circuit unit 30, a substantially right-angled flexible connection board 20 is provided, and the right-angled flexible connection board 20 is arranged in the X-axis direction. The X electrode portion 22 is formed, the X electrode 12 of the upper glass substrate and the X electrode portion 22 of the flexible connection substrate 20 are bonded with an anisotropic conductive adhesive, and the Y electrode 13 of the lower glass substrate and the flexible connection substrate 20 are bonded. Y electrode portion 23
And are bonded with an anisotropic conductive adhesive. Further, the circuit unit connection portion 21 is formed in the direction opposite to the X electrode portion of the flexible connection board 20, and the second circuit unit 10 and the first circuit unit 30 which are liquid crystal display bodies are connected via the flexible connection board 20. .

However, the flexible connection substrate 20 disclosed in the above publication has the X electrode portion 22 and the Y electrode portion 2
3 has a substantially right-angled shape (L shape), and the circuit unit connection portion 21 is formed in the direction opposite to the X electrode portion, so that the flexible connection substrate has a T shape. Therefore, if a T-shaped or L-shaped flexible connection substrate is die-cut and taken out from the raw material of the rectangular flexible substrate, the flexible substrate corresponding to the liquid crystal display portion is wasted. Japanese Patent Laid-Open No. 2-170132 is disclosed as a countermeasure.

Further, according to Japanese Patent Laid-Open No. 2-170132, a rectangular parallelepiped flexible connection board is formed into a U-shape along a side of a rectangular display portion which is a second circuit unit. After bending 90 degrees twice, second
A flexible substrate (TAB) for tape carrier is disclosed which is connected to a circuit unit and further has a display drive circuit formed on a flexible connection substrate. In the above publication, since the flexible connection board is a rectangular parallelepiped, waste of the flexible connection board can be omitted. However, in the above publication, in order to connect the first circuit unit in which the drive circuit on the flexible connection board and the display section are separately provided, the first circuit unit is provided at the opposite end of the flexible connection board connected to the second circuit unit. The printed circuit board on which the circuit unit is formed must be connected, and therefore the printed circuit board on which the circuit unit is formed must be shaped to match the U-shape of the flexible connection board. There is. Furthermore, the width of the flexible connection board is wide,
The flexible connection board covers the display portion of the second circuit unit to narrow the display portion.

[0007]

In the prior art as described above, the flexible connecting board has to be formed in conformity with the second circuit unit, and the flexible connecting board has a T shape or an L shape. If a T-shaped or L-shaped flexible connection substrate is die-cut and taken out from the raw material of the flexible connection substrate forming the above, the flexible substrate corresponding to the liquid crystal display portion is wasted. In addition, if a flexible connection board that is a rectangular parallelepiped is bent 90 degrees twice in a U-shape along the side of the rectangular display portion that is the second circuit unit, the flexible connection board is opposite to the flexible connection board. There is a problem in that the printed circuit board must be connected to the end of the board and the shape of the printed circuit board forming the external control circuit must be determined according to the flexible connection board. Further, the width of the flexible connection board is wide, and it is difficult to arrange the flexible connection board so that the flexible board does not cover the display portion of the second circuit unit.

[0008]

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems is to provide a first circuit unit and a second circuit having an X electrode and a Y electrode for connecting to the surfaces of the circuit board in a direction perpendicular to each other. In an electronic device for connecting a circuit unit using a flexible connection board, the X electrode section and the Y electrode section of the flexible connection board are formed on a substantially straight line, and the X electrode section and the Y electrode section are connected. Part, the first circuit unit connection part is formed in parallel with the X electrode part or the Y electrode part, and a part of the flexible connection board is bent so that the X electrode part and the Y electrode part are positioned substantially at right angles to each other. A circuit connection unit having a right-angled arrangement shape, in which the flexible connection board having the right-angled shape and the second circuit unit are connected to each other, and a contact on an electrode on a board of the second circuit unit. Circuit connection unit, characterized in configuration elaborate bent inwardly of the substrate of the second circuit unit protrusions of the flexible connection substrate that is.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 5 are diagrams for explaining the configuration of the first embodiment. FIG. 1 shows a liquid crystal display which is an example of the second circuit unit 10. When viewed from the front side in FIG. 1, the X electrode 12 is formed on the back surface side of the connected body 10 and the Y electrode 13 is formed on the front surface side. In FIG. 2, a flexible circuit for connecting a first circuit unit 30 and a second circuit unit 10 on which a circuit for driving or controlling a liquid crystal display body illustrated in the conventional example is mounted. A connection board 20 is shown, a Y electrode portion 23 and an X electrode portion 22 are formed on the flexible connection board 20, and a connection portion between the X electrode portion 22 and the Y electrode portion 23 is formed on a substantially straight line. Further, a circuit unit connecting portion 21 for connecting to the first circuit unit 30 is formed in parallel with the X electrode portion 22 or the Y electrode portion 23. The Y electrode portion 23 of the flexible connection substrate 20 and the Y electrode 13 of the connected body 10 are arranged in parallel and the electrodes are overlapped with each other, and the Y electrode 13 and the Y electrode portion 23 are bonded with an anisotropic conductive adhesive. To do. After adhering the Y electrode 13 and the Y electrode portion 23, the end portion of the Y electrode portion 23 opposite to the adhering end portion is attached to the Y electrode 1
The Y electrode portion 2 of the flexible connection substrate 20 which is bent 180 degrees around the end portion of 3 and is not related to the connection with the Y electrode 13.
3 is arranged on the back surface of the Y electrode 13. This state is shown in FIG. 3 with the second circuit unit 10 omitted. In FIGS. 3 and 4 in which the second circuit unit 10 is omitted, a portion closer to the X electrode portion than the vicinity of the coupling portion between the X electrode portion 22 and the Y electrode portion 23 from the state of FIG. The flexible connection board 20 is bent by approximately 180 degrees so that the X electrode 12 of the circuit unit 10 and the X electrode portion 22 of the flexible connection board 20 face each other, and the state shown in FIG. 4 is obtained. The X electrode 12 of the second circuit unit 10 and the X electrode portion 22 of the flexible connection board 20 facing each other are connected by an anisotropic conductive adhesive. Further, as shown in FIG. 5, the X electrode portion 22 is connected to the second circuit unit 1.
A circuit characterized in that a flexible connection board 20 is disposed on the back surface of the X electrode 12 by bending an end portion of the 0 electrode opposite to the end portion connecting to the X electrode 12 by about 180 degrees around the end portion of the X electrode 12. It is a connection unit.

Further, as shown in FIG. 5, a fixing means 24 such as a double-sided adhesive tape or an adhesive is attached to the X of the flexible connection board.
A circuit connection unit characterized in that it is provided near the electrode portion 22, near the Y electrode portion 23, or near both electrode portions, and fixes the flexible connection substrate 20 bent 180 degrees around the electrode end portion of the second circuit unit 10. Is.

Further, even if the circuit unit connecting portion 21 is arranged on the extension of the X electrode portion 22 in the X-axis direction as shown in FIG. 6, the conventional drawback can be solved. Further, even if the circuit unit connecting portion 21 is arranged on the extension of the Y electrode portion 23 in the Y-axis direction as shown in FIG. 7, the circuit connecting unit solves the conventional drawbacks.

[0012]

As described above, according to the present invention, since it is not necessary to form the flexible connection board in the T shape or the L shape in accordance with the second circuit unit, the flexible connection board in the substantially linear state can be formed. Economical flexible connection because it is possible to eliminate the flexible board corresponding to the liquid crystal display part that is wasted when the flexible connection board is die-cut from the raw material of the rectangular flexible connection board, which has been a problem in the conventional technology. Can manufacture substrates. In addition, when using another conventional flexible connection board having a rectangular parallelepiped shape, which is bent in a U-shape twice at 90 degrees along the side of the rectangular display portion which is the second circuit unit, The problem that the printed circuit board forming the first circuit unit has to be shaped according to the flexible connection board, which is caused by the above, is solved by forming the circuit unit connection section in parallel or in a straight line with the X electrode section and the Y electrode section. Further, the problem that the width of the conventional flexible connection substrate is wide and the display portion of the second circuit unit is covered by the flexible substrate can be solved by bending along the electrode end portion of the second circuit unit. Further, since the flexible connection board of the wiring portion of the X electrode portion and the Y electrode portion of the flexible connection board is bent under the electrode of the second circuit unit, the display portion of the liquid crystal display body which is an example of the second circuit unit is enlarged. Therefore, the circuit connecting unit can be obtained which has the effects of downsizing the entire device and economical efficiency.

Further, since the wiring portions of the X electrode portion and the Y electrode portion of the flexible connection board are bent under the electrodes of the second circuit unit and the flexible connection board is fixed by the fixing member, the flexible connection board pops out on the display screen. There is no danger and the workability of assembling the circuit connection unit is also improved.

Further, according to the present invention, I is provided on a flexible connection board which is one component constituting the circuit connection unit.
The same effect as described above can be obtained with TAB in which C is arranged.
In particular, the effect of the circuit connection unit of the present invention is great with respect to a COG type liquid crystal display body having a display portion such as a liquid crystal display body and having an IC mounted on the end of the second circuit unit.

[Brief description of drawings]

FIG. 1 is a plan view of a second circuit unit of the circuit connecting unit according to the first embodiment of the present invention.

FIG. 2 is a plan view in which the first circuit unit in the circuit connection unit according to the first embodiment of the present invention is omitted.

FIG. 3 is a plan view in which the flexible connection board and the first circuit unit in the circuit connection unit according to the first embodiment of the present invention are omitted.

FIG. 4 is a plan view in which the flexible connection board and the first circuit unit in the circuit connection unit according to the first embodiment of the present invention are omitted.

FIG. 5 is a plan view in which the first circuit unit in the circuit connection unit according to the first embodiment of the present invention is omitted.

FIG. 6 is a plan view of a flexible connection board showing a second embodiment of the present invention.

FIG. 7 is a plan view of a flexible connection board showing a third embodiment of the present invention.

FIG. 8 is a plan view of a circuit connection unit showing a conventional example.

[Explanation of symbols]

 10 2nd circuit unit 11 Display part 12 X electrode 13 Y electrode 20 Flexible connection board 21 Circuit unit connection part 22 X electrode part 23 Y electrode part 24 Fixing means 30 1st circuit unit

Claims (2)

[Claims] 1. An electronic device for connecting a first circuit unit and a second circuit unit having an X electrode and a Y electrode for connecting to a surface of a circuit board in a direction perpendicular to each other by using a flexible connection board. While forming the X electrode portion and the Y electrode portion of the flexible connection board on a substantially straight line,
A first circuit unit connection portion for connecting the first circuit unit is formed in parallel with the X electrode portion or the Y electrode portion from the connection portion between the X electrode portion and the Y electrode portion, and the flexible connection substrate A circuit connecting unit characterized in that a part thereof is bent to form a right angle arrangement in which the X electrode portion and the Y electrode portion are positioned substantially at right angles to each other, and the flexible connection board having the right angle arrangement is connected to the second circuit unit. . 2. A circuit connecting unit characterized in that a protrusion of the flexible connecting board connected to an electrode on the board of the second circuit unit is bent inside the board of the second circuit unit.