JP3432504B2 - Display device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode unit of a circuit unit having an X electrode and a Y electrode on orthogonal sides, respectively, the electrode unit being connected to the X electrode and the Y electrode. And a circuit unit using the same. 2. Description of the Related Art As means for optically displaying electric signals, for example, there are a plasma display device and a liquid crystal display device, and these display devices require a circuit for controlling a display section. Yes, and a circuit for driving the display unit is required. These circuits generally have a configuration separated from the display unit. However, a circuit for driving the display unit may have a structure integrally formed with the display unit. For this reason, means for connecting the display section and the circuit section is required. As this means, a flexible connection substrate, which is a substrate which can be easily deformed and easily mass-produced, is used. [0003] As an example of the second circuit unit, an X electrode is generally provided at an end of the display section of the display device in the X-axis direction, and a Y electrode is provided in the Y-axis direction. A flexible connection board for X electrodes and a flexible connection board for Y electrodes are arranged along the X electrodes and Y electrodes of the display section, and the connection electrodes of each flexible connection board and the X of the display section are arranged.
The electrodes and the Y electrodes are connected via conductive means such as an anisotropic conductive adhesive. Further, a first circuit unit which is a control circuit unit of the display unit separated from the display unit by a first circuit unit connection unit provided at an end of each of the flexible connection substrates for the X electrode and the Y electrode is provided. It is configured to connect a flexible connection board. A conventional example is shown in FIG. 8 disclosed in Japanese Patent Application Laid-Open No. 1-235922 (hereinafter referred to as "conventional example 1"). In the liquid crystal display, which is an example of the second circuit unit 10 in FIG. 8, two upper and lower glass substrates having electrodes formed on one surface are opposed to each other, and the liquid crystal is sandwiched in this gap. The periphery of the liquid crystal is sealed with a sealing material, and the display section 11 is formed by the liquid crystal portion. Further, a driving IC for driving the liquid crystal is mounted on the ends of the upper and lower glass substrates, and the glass substrate is formed larger than the outer periphery of the display unit 11 in order to provide an electrode for connecting to the flexible connection substrate 20. In FIG. 8, the lower glass substrate forms 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. In order to electrically connect the X electrode 12, the Y electrode 13, and the first circuit unit 30 of the second circuit unit 10, a flexible connection substrate 20 having a substantially right-angled shape is provided.
X in the X-axis direction of the right-angled flexible connection substrate 20
An electrode portion 22 is formed, and 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 Y electrode The electrode portion 23 is bonded with an anisotropic conductive adhesive. Further, a circuit unit connection portion 21 is formed in a direction opposite to the X electrode portion of the flexible connection substrate 20,
The second circuit unit 10, which is a liquid crystal display, is connected to the first circuit unit 30 via the flexible connection board 20. [0005] However, the flexible connection substrate 20 disclosed in the above publication has an X electrode section 22 and a Y electrode section 2.
3 form a substantially right-angled shape (L shape), and since the circuit unit connection portion 21 is formed in a direction opposite to the X electrode portion, the flexible connection substrate has a T shape. For this reason, T from the raw material of the rectangular flexible connection substrate
There is a problem that when a flexible connection substrate having a shape or an L-shape is cut out and taken out, the flexible connection substrate corresponding to the liquid crystal display portion is wasted. Is disclosed. Japanese Unexamined Patent Publication No. Hei 2-170132 (hereinafter referred to as "conventional example 2") discloses that a rectangular parallelepiped flexible connection board is formed on a side of a rectangular display portion as a second circuit unit. After being bent 90 degrees twice in a U-shape along the line, it is connected to the second circuit unit, and furthermore, a flexible connection board for tape carrier (TA) having a configuration in which a display drive circuit is formed on the flexible connection board.
B) is disclosed. In the above publication, since the flexible connection substrate is a rectangular parallelepiped, waste of the flexible connection substrate can be eliminated. However, in the above-mentioned publication, the first circuit unit provided with the drive circuit and the display unit on the flexible connection board separately is connected, so that the first end is connected to 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 in accordance with the U-shape of the flexible connection board, which has the problem that the printed circuit board is wasted. I have. Further, the width of the flexible connection board is wide, and the display section of the second circuit unit is covered with the flexible connection board, and the display section is narrowed.
As another conventional technique, there is a technique disclosed in Japanese Patent Application Laid-Open No. 62-289815 (hereinafter referred to as "Conventional Example 3"). In the prior art such as the above-mentioned prior art 1 or 2, the flexible connection board must be formed in accordance with the second circuit unit. In order to make the shape or L-shape, from the raw material of the flexible connection board which is rectangular,
If a T-shaped or L-shaped flexible connection substrate is cut out and taken out, there is a problem that the flexible connection substrate corresponding to the liquid crystal display portion is wasted. A rectangular parallelepiped flexible connection board is formed in a U-shape along the side of the rectangular display unit which is the second circuit unit.
When using a flexible connection board that is bent 90 degrees, a printed board must be connected to the opposite end of the flexible connection board, and the shape of the printed board that forms the external control circuit is determined according to the flexible connection board. Have problems that must be addressed. Further, there is also a problem that the width of the flexible connection substrate is wide and it is difficult to arrange the flexible connection substrate so that the display portion of the second circuit unit is not covered by the flexible connection substrate. In the case of Conventional Example 3 described above, it is considered to be superior to Conventional Examples 1 and 2 in that a flexible connection substrate can be efficiently obtained from raw materials. However, when the flexible connection board is bent in order to reduce the space for disposing the flexible connection board, there is a problem that the number of bent portions increases.
That is, as apparent from a comparison between FIG. 1 and FIG. 3 of the same publication, in order to fold the common side, an additional bent portion is provided near the 90-degree bent portion of the flexible connection board. Required, and then one additional fold to fold the segment side. That is, a total of three bent portions are required in the intermediate portion other than the bent portion of the electrode portion. If the electrode portion is bent to the opposite side of the substrate, the bending angle of the bent portion can be 90 degrees or more, but the bending angle at the intermediate portion becomes an acute angle, and there is a risk of disconnection. . Increasing the bending angle in order to avoid the risk of disconnection increases the thickness of the bent portion and wastes space. Therefore, it is desirable that the number of such bent portions be as small as possible. [0008] In order to solve the above problems,
The present invention provides an X-electrode on each of two adjacent and orthogonal sides.
And a display body having a Y electrode, and the X electrode and
The X electrode portion and the Y electrode portion connected to each of the Y electrodes
A connection formed on the other end and connected to a circuit outside the display body
And a flexible connection substrate having a portion.
Wherein the flexible connection substrate comprises the Y electrode
The front and back of the Y electrode portion are centered on an axis parallel to the side having
A first bent portion that is bent so as to be inverted;
With respect to the axis inclined with respect to the side provided with the electrode, the X
The second bending that bends the electrode part so that it is upside down
Around the axis parallel to the side provided with the X electrode
Third folding of the X electrode part to be turned upside down
A bent portion, the first bent portion, the second bent portion
A bent portion and a third bent portion provided with the Y electrode.
Intersection of an axis parallel to the side and an axis parallel to the side with the X electrode
A display device formed at a position deviating from the difference portion.
Place. That is, the gist of the present invention for solving the above problem is to provide a circuit unit having an X electrode and a Y electrode on orthogonal sides, respectively, and a flexible connection substrate having an electrode portion connected to the X electrode and the Y electrode. Another object of the present invention is to economically take out raw materials of a flexible connection substrate and reduce the number of bent portions for reducing the space for disposing the flexible connection substrate. An embodiment of the present invention will be described below with reference to the drawings for a liquid crystal display device. 1 to 5 are diagrams for explaining the configuration of the first embodiment. FIG. 1 shows the second
A liquid crystal display as an example of the circuit unit 10 is shown. When X is viewed from the front direction, X
An electrode 12 is formed, and a Y electrode 13 is formed on the surface side. Further, FIG. 2 shows a first circuit unit 30 in which a circuit for driving or a circuit for controlling the liquid crystal display as shown in the conventional example is mounted, and
A flexible connection board 20 for connecting to the circuit unit 10 is illustrated . In FIG. 2, flexiv
The connection electrode 20 has a Y electrode portion 23 and an X electrode portion 22 as shown in FIG.
Formed in a substantially rectangular shape with long and short sides like
Have been. Such a flexible connection substrate 20
Flexible substrate having X electrode portion 22 on the long side of rectangle
Section and flexible having a Y electrode section 23 on the long side of the rectangle
It consists of a substrate part. A frame having these X electrode portions 22
Flexible base having a kibble substrate part and a Y electrode part 23
Plates are arranged so that their long sides are parallel to each other
ing. Also, a flexible substrate having a Y electrode portion 23
How to extend the flexible substrate part whose part has the X electrode part 22
Direction, and are connected to each other on the short side.
And one of the flexible connection substrates 20
A part is formed. This flexible connection board 20
Is between the Y electrode portion 23 and the X electrode portion 22 as shown in FIG.
Circuit unit connecting portion 21 drawn obliquely downward from
Is provided. This circuit unit connection portion 21
Flexible substrate portion having electrode portion 23 and X electrode portion 22
Integrated so that it can be connected to a flexible substrate with
After being pulled obliquely downward from the vicinity of the formed part, X
Substantially parallel to the long side of the flexible substrate portion having the electrode portion 22
It extends to become. Flexible connection board 20
FIG. 5, which is a state assembled in the two-circuit unit 10,
As shown, the circuit unit connecting portion 21 is connected to the X electrode 1
Across the side of the second circuit unit 10 having
Of ing to be drawn to the lower side of the looking at the figure. like this
The circuit unit connecting part 21 drawn out to the X electrode
The extension of the side of the second circuit unit 10 having the
The extension line of the side of the second circuit unit 10 having the pole 13 is
Connect to external circuits without passing through the intersection
Can be. Further, the flexible connection substrate 20 shown in FIG.
The second circuit unit of the X electrode section 22 and the Y electrode section 23
The connection part connected to the gate 10 is formed on a substantially straight line. this
The long sides of the X electrode section 22 and the Y electrode section 23 are formed substantially in parallel.
ing. For connecting to the first circuit unit 30.
The circuit unit connection part 21 having a substantially rectangular shape is
The longer side of the X electrode portion 22 or the Y electrode portion 23
Flexible connection board 2 so as to be substantially parallel to the long side
0 is formed. The X electrode portion 22 and the Y electrode
The pole part 23 is provided with the tip sides on the connection side substantially parallel to each other.
And the tip sides are arranged in the same direction.
It has a unique configuration. As described above, the Y electrode portion 23 and the X electrode portion 22 are formed on the flexible connection substrate 20, and the connection portion between the X electrode portion 22 and the Y electrode portion 23 is formed on a substantially straight line. A circuit unit connecting portion 21 for connecting to the first circuit unit 30 in parallel with the portion 22 or the Y electrode portion 23 is formed. FIG.
As is clear from FIG. 5, the tip sides of the X electrode portion 22 and the Y electrode portion 23 are provided substantially parallel to each other and in the same direction . The Y electrode portion 23 of the flexible connection substrate 20 and the Y electrode 13 of the second circuit unit 10 which is the connected body are arranged in parallel and the electrodes are overlapped with each other so that the Y electrode 13 and the Y electrode portion 23 are anisotropic. With a conductive adhesive . After the Y electrode 13 and the Y electrode 23 are bonded, the end opposite to the bonded end of the Y electrode 23 is bent 180 degrees around the end of the Y electrode 13 to be flexible regardless of the connection with the Y electrode 13. The Y electrode portion 23 of the connection substrate 20 is arranged on the back surface of the Y electrode 13. That is, the flexible connection substrate 20 is
An axis parallel to the side of the second circuit unit 10 provided with 3
Fold it around the center so that the X electrode part 22 is upside down.
Bent to form a first fold. Such a file
The flexible connection board 20 is connected to the X
The pole 12 and the Y electrode 13 are connected.
In addition, since connection cannot be made with the rectangular shape,
The connection board 20 is bent. This is further explained
Then, the Y electrode portion 23 of the flexible connection substrate 20 and the second
The Y electrode 13 of the circuit unit 10 is connected with an anisotropic conductive adhesive.
Continue. In this state, the Y electrode 1 of the second circuit unit 10
Front and back of the Y electrode portion 23 around an axis parallel to the side provided with 3
The first bent portion is bent by reversing
To form As shown in FIG. 2 to FIG. Further
The integrated part of the X electrode part 22 and the Y electrode part 23 is
Bent in the direction across the long side of the flexible connection substrate 20
Flexible with the X electrode 12 of the second circuit unit 10
The X electrode section 22 of the substrate unit 20 is connected. Sand
That is, the side provided with the Y electrode 13 of the second circuit unit 10
The X electrode part 22 is turned upside down about the tilted axis.
To form a second bent portion. Fig. 3
As shown in FIG. Furthermore, the second circuit unit 10
The X electrode portion 2 is centered on an axis parallel to the side having the X electrode 12.
A third bent portion that is bent so that the front and back of 2 are reversed.
To form As shown in FIG. 4 to FIG. in this way
By bending, the display device of the present invention shown in FIG. 5 is obtained.
You. The display device thus obtained is as shown in FIG.
The first bent portion, the second bent portion, and the third
The bent portion is provided with the Y electrode 13 of the second circuit unit 10.
And the axis parallel to the side with the X-electrode 12
The bent portion is not located at the intersection of. Further
As shown in FIG. 5, the bent portion is the second circuit unit 1.
0 or above or below the glass substrate
And the position where there is no glass substrate at the intersection is not
It is arranged in the position where it was. Folded like this
Because it is the flexible connection substrate 20,
It is effectively fixed by the double-sided adhesive tape.
In addition, in the position where the glass substrate which is the intersection does not exist,
Does not have the flexible connection substrate 20. Therefore,
Using this intersection, the display device of FIG.
It is possible to improve
Akira works effectively. 2 and 3, flexible
One of the X electrode portion 22 and the Y electrode portion 23 of the
The width of the short side in the embodied portion is the X electrode portion 22
A flexible substrate portion or a Y electrode portion 23 having
Thinner than the width of the short side of the flexible printed circuit. Shows a diagram is omitted second circuit unit 10 in FIG. 3. In FIGS. 3 and 4 where the second circuit unit 10 is omitted, FIG.
X electrode 12 from the state where near the X electrode portion from the integrated portion near <br/> beside the flexible substrate portion and a flexible substrate portion and the Y electrode 23 having an X electrode 22, the second circuit unit 10 And the X electrode portion 22 of the flexible connection substrate 20
The flexible connection board 20 is set to approximately 1 so that
It is bent by 80 degrees to obtain the state shown in FIG. That is, the Y electrode
13 around the axis inclined with respect to the side with
The electrode part 22 is folded upside down so that the second folding is performed.
Bends. The X electrode 12 of the second circuit unit 10 and the X electrode portion 22 of the flexible connection substrate 20 facing each other by the second bending are connected by an anisotropic conductive adhesive. Further, as shown in FIG. 5, the end opposite to the end where the X electrode portion 22 connects to the X electrode 12 of the second circuit unit 10 is bent substantially 180 degrees around the end of the X electrode 12 to obtain a flexible connection substrate. 20 is arranged on the back surface of the X electrode 12. From FIG. 5 and FIG.
As is evident, the second bend is in the second circuit unit.
Near the X electrode 12 of the second circuit unit 10
Located above. In the state of FIG.
A fixing means 24 made of a double-sided tape is provided.
In the flexible connection board section 20 having the X electrode section
Then, on the side opposite to the end of the X electrode section 22 by the fixing means.
Is fixed to the second circuit unit 10. This
Is connected to the second circuit unit 10 and assembled.
Circuit unit connection part 21 of flexible connection board 20
Is the side of the second circuit unit 10 where the X electrode 12 is provided.
It is assembled to protrude from. 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
The flexible connection board 20 may be provided in the vicinity of the electrode section 22, the Y electrode section 23, or both electrode sections, and fixed by 180 degrees around the electrode end of the second circuit unit 10. Further, even if the circuit unit connecting portion 21 is arranged on the X-electrode portion 22 extending in the X-axis direction as shown in FIG. Further, as shown in FIG.
It may be arranged on the extension in the axial direction. As is clear from a comparison between FIG. 4 and FIG. 5, only two bending portions are required at the intermediate portion between the X electrode portion and the Y electrode portion. Further, in this embodiment, since the additional bent portion is bent so as to sandwich the substrate, the bending angle can be set to 90 degrees or more, and the possibility of disconnection can be greatly reduced. As described above, according to the present invention, it is not necessary to form the flexible connection board into a T-shape or an L-shape according to the second circuit unit, and the flexible connection board can be formed in a substantially linear state. Because it is possible, it is possible to eliminate the useless flexible connection substrate corresponding to the liquid crystal display portion when the flexible connection substrate is die-cut from the raw material of the rectangular flexible connection substrate, which has been a problem in the prior art, and is economical. It is possible to manufacture a flexible connection board with good quality. In addition, when a flexible connection substrate having a rectangular parallelepiped, which is another conventional example, is bent 90 degrees twice in a U-shape along a side of a rectangular display portion which is a second circuit unit when the flexible connection substrate is used. Occurs in the first
The problem of having to determine the shape of the printed circuit board that forms the circuit unit according to the flexible connection board is solved by forming the circuit unit connection part in parallel or on a straight line with the X electrode part and the Y electrode part. The problem that the connection board is wide and the display section of the second circuit unit is covered with the flexible connection board can also be solved by bending along the electrode end of the second circuit unit. Further, since the flexible connection substrate of the wiring portion of the X electrode portion and the Y electrode portion of the flexible connection substrate is bent below the electrode of the second circuit unit, the display portion of the liquid crystal display as an example of the second circuit unit is enlarged. This has the effect of reducing the size of the entire device and of economic 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 jumps out on the display screen. There is no danger, the workability of assembling the circuit connection unit is improved, and the number of bent portions at the intermediate portion other than the electrode portion is small, and the possibility of disconnection at the bent portion is greatly reduced, and the reliability is improved. In particular, if the bending at the intermediate portion is performed so as to sandwich both sides of the substrate, the effect is further enhanced. Further, the present invention provides a method for mounting an IC on a flexible connection substrate, which is one component of a circuit connection unit.
The same effect as described above can be obtained for TAB in which C is arranged.
In particular, the effect of the circuit connection unit of the present invention is great for a COG type liquid crystal display having a display portion such as a liquid crystal display and an IC mounted at an end of the second circuit unit.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a second circuit unit of a circuit connection unit according to a first embodiment of the present invention. FIG. 2 is a plan view of the circuit connection unit according to the first embodiment of the present invention, in which the first circuit unit is omitted. FIG. 3 is a plan view omitting a flexible connection board and a first circuit unit in the circuit connection unit according to the first embodiment of the present invention. FIG. 4 is a plan view omitting a flexible connection board and a first circuit unit in the circuit connection unit according to the first embodiment of the present invention. FIG. 5 is a plan view of the circuit connection unit according to the first embodiment of the present invention, in which the first circuit unit is omitted. FIG. 6 is a plan view of a flexible connection board according to a second embodiment of the present invention. FIG. 7 is a plan view of a flexible connection board according to a third embodiment of the present invention. FIG. 8 is a plan view of a circuit connection unit showing a conventional example. DESCRIPTION OF SYMBOLS 10 Second circuit unit 11 Display unit 12 X electrode 13 Y electrode 20 Flexible connection board 21 Circuit unit connection unit 22 X electrode unit 23 Y electrode unit 24 Fixing means 30 First circuit unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G02F 1/1345 H05K 1/02 H05K 1/14

Claims (1)

(57) [Claims 1] An X-electrode is applied to each of two adjacent and orthogonal sides.
A display body having a pole and a Y electrode;
An X electrode portion and a Y electrode portion connected to each of the Y electrodes;
Is formed on the other end, and a connection for connecting to a circuit outside the display body is formed.
And a flexible connection substrate having a connection portion.
In the device, the flexible connection substrate is provided on a side provided with the Y electrode.
Invert the front and back of the Y electrode section around a parallel axis.
A first bent portion that bends at a predetermined angle, and the Y electrode.
Front and back of the X electrode part around an axis inclined with respect to the side
A second bent portion to bend so as to reverse the;
The X electrode portion is centered on an axis parallel to the side having the X electrode.
Has a third bent part that bends upside down
And the first bent portion, the second bent portion, and
The third bent portion is formed by an axis parallel to the side having the Y electrode.
Deviation from the intersection of the axis parallel to the side with the X electrode
A display device formed at a different position.