JP2000252386A - Display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent variable display and a connection failure between an electrode terminal of a semiconductor device for driving and an electrode pad of an extended electrode. SOLUTION: On a non-indication region of a signal-side substrate, a pattern of extended electrodes 18(18a, 18b, (18c)) is formed and a semiconductor device for driving is bonded face down. Electrode pads 20a of the extended electrodes 18a are arranged by a pitch P1 and electrode pads 20b of the extended electrodes 18b, (18c) are arranged by a pitch P2. In correspondence with these electrodes pads 20a, 20b, electrode terminals of the semiconductor device for driving are also formed by the same pitches P1, P2. The extended width L of each electrode pad 20a and the width D of each electrode terminal 21a for output are so set as to satisfy (L-D)<(P2-P1).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device such as a liquid crystal display device or an EL display device in which a driving semiconductor element is mounted face-down.

[0002]

2. Description of the Related Art A known liquid crystal display device will be described with reference to FIGS. 4 is a plan view of the COG-type liquid crystal display device 1, FIG. 5 is a cross-sectional view taken along the line XX of FIG. 4, FIG. 6 is a cross-sectional view of a main part near the driving semiconductor element, and FIG. FIG. 8 is a plan view of a main part of the vicinity, and FIG. 8 is a plan view of a main part of an electrode pad group on which a driving semiconductor element is mounted.

According to the COG type liquid crystal display device 1, a scanning side substrate 4 and a signal side substrate 5 each formed of a glass substrate having ITO transparent electrodes 2 and 3 formed on the inner surface thereof are arranged to face each other. An alignment film of a polyimide resin is provided on each of the substrates 2 and 3.
The liquid crystal 8 is sealed with the spacing between the substrates fixed by a spacer 7 made of, for example, a resin spherical body. A driving semiconductor element 9 is provided on the non-display area 12 of the signal-side substrate 5, and an FPC for an input cable is provided.
10 is connected.

[0004] The display unit 1 is provided by both substrates 4 and 5.
1 and a large number of transparent electrodes 3 forming a display unit 11 extend on the non-display area 12 of the signal side substrate 5, and the transparent electrode 2 on the other scanning side substrate 4 also passes through the Ag paste 13 on the signal side. It extends over the non-display area 12 of the substrate 5 and forms an extended electrode 14.

Moreover, in order to mount the driving semiconductor element 9 on the signal side substrate 5, a method of directly mounting the semiconductor element 9 face down is used. That is, the anisotropic conductive resin 2 in which conductive particles are dispersed in a resin containing epoxy as a main component is formed by the bump electrodes 22 of the driving semiconductor element 9 made of gold.
3 through an electromechanical connection.

In the region on the signal side substrate 5 where the driving semiconductor element 9 is mounted, a pattern of the extended electrode 14 is formed as shown in FIGS.

Each of the driving semiconductor elements 9 has a long shape.
A large number of electrode terminals are arranged along the periphery of the display unit 11 in a substantially parallel manner along the periphery of the display unit 11 and on the mounting surface of the driving semiconductor element 9 along four circumferences. An input electrode terminal is arranged on one side of the electrode terminal group arranged on the long side of the driving semiconductor element 9, and an input electrode 15 is arranged on the signal side substrate 5 correspondingly, Are electrode terminals for output, and correspondingly, the extended electrodes 14 are provided on the signal side substrate 5.
a is formed. Extended electrode 14 connected to output electrode terminal groups arranged on both short sides of drive semiconductor element 9
b, 14c are also formed.

In the electrode terminal group of the driving semiconductor element 9, the electrode terminals are arranged at substantially equal intervals on each side, and the extended electrodes 14a, 14b,.
The electrode pads provided at each end of 14c are also arranged at the same pitch.

FIG. 8 shows an electrode pad 16a of the extended electrode 14a.
And the electrode pads 16b of the extended electrodes 14b are arranged at a pitch P1. An output electrode terminal 17a disposed on the electrode pad 16a and an output electrode terminal disposed on the electrode pad 16b Terminal 17b is also shown.

[0010]

However, in the liquid crystal display device 1 described above, the driving semiconductor element 9 is provided between the extended electrode 14a and the extended electrodes 14b and 14c.
The length of the extended electrode 14 having a long wiring length
The wiring resistances of b and 14c are larger than those of the extended electrode 14a, and as a result, image quality deterioration such as display unevenness has occurred.

When the driving semiconductor element 9 is mounted, it tends to swing in the y-axis direction as shown in FIG. 9, so that the output electrode terminals 17a and 17b of the driving semiconductor element 9
The positional relationship between the electrode pads 16a and 16b is shifted,
When the inclination angle θ due to such a shake becomes large, a remarkable shift occurs particularly in the positional relationship between the electrode pad 16b and the output electrode terminal 17b, and as a result, the output electrode terminal 17b of the driving semiconductor element 9 There is a problem that a connection failure occurs.

The inventor of the present invention has conducted intensive studies in view of the above circumstances. As a result, a driving semiconductor device having electrode terminals arranged at a pitch P1 in the long side direction and electrode terminals at a pitch P2 in the short side direction. Is used, the relationship between the extended dimension width L and the electrode terminal width D in the electrode pads arranged in the long side direction is (L−
D) It has been found that both problems can be solved by performing face-down connection on an electrode pad group defined so that <P2-P1.

The present invention has been completed based on the above findings, and has as its object to eliminate uneven display and poor connection between the electrode terminals of the driving semiconductor element and the electrode pads of the extended electrodes, thereby achieving high quality and high quality. An object of the present invention is to provide a highly reliable liquid crystal display device.

Another object of the present invention is to provide a low cost liquid crystal display device by eliminating the connection failure, thereby increasing the production yield and reducing the production cost.

Still another object of the present invention is to simplify the manufacturing process management by design conditions for eliminating both display unevenness and poor connection, thereby reducing the production cost. It is in.

[0016]

[Means for Solving the Problems] The display device of the present invention comprises:
On a non-display area of a substrate having a rectangular display such as a liquid crystal or an EL, a large number of electrodes constituting the display are extended to form an electrode pad group at an end, and the electrode pads are formed along the periphery of the display. In a configuration in which each electrode terminal of a long driving semiconductor element arranged substantially in parallel is face-down connected to an electrode pad group, the electrodes are arranged at a pitch P1 in the long side direction and at a pitch P2 in the short side direction. The driving semiconductor element having the terminals arranged therein,
The electrode pads are arranged on an electrode pad group defined such that the relationship between the extended dimension width L and the electrode terminal width D in the electrode pads arranged in the long side direction is (LD) <(P2-P1). It is characterized by.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a display device of the present invention will be exemplified by a liquid crystal display device. The present invention uses the C shown in FIGS.
It has the same configuration as that of the OG type liquid crystal display device 1 and is characterized by the electrode terminal arrangement structure of the driving semiconductor element and the electrode pad arrangement structure on the substrate.
This will be described below.

FIG. 1 is a plan view of a main portion near a driving semiconductor element mounted on the liquid crystal display device 1a, FIG. 2 is a cross-sectional view taken along line YY of FIG. 1, and FIG. 3 is an electrode on which the driving semiconductor element is mounted. It is a principal part top view of a pad group. The conventional liquid crystal display device 1
The same reference numerals are given to the same members.

According to the liquid crystal display device 1a, the signal side substrate 5
The pattern of the extended electrode 18 is formed on the non-display portion region 12 of FIG. 1, and the driving semiconductor element 9 a is connected face-down on the extended electrode 18.

On the mounting surface of the driving semiconductor element 9a, a large number of electrode terminals are arranged along four circumferences. One of the electrode terminals arranged on the long side is an input electrode terminal. The other electrode terminal group is an output electrode terminal, and is joined to the extended electrode 18a. Further, regarding the output electrode terminal groups arranged on both short sides of the driving semiconductor element 9a, the extended electrodes 18b, 18c
Connected to

Then, as shown in FIG.
Are arranged at a pitch P1, the electrode pads 20b of the extended electrodes 18b, 18c are arranged at a pitch P2, and correspond to these electrode pads 20a, 20b, and the electrode terminal group of the driving semiconductor element 9a is also arranged. Same pitch P1, P2
Is formed. Further, FIG. 3 shows the positional relationship between the electrode pads 20a and 20b and the output electrode terminals 21a and 21b of the driving semiconductor element 9a. The output electrode terminals 21a and the output electrode terminals 21b have a general rectangular shape, but are not limited thereto, and may have a circular shape, an elliptical shape, or a square shape.

In the present invention, the relationship between the extended dimension width L of the electrode pad 20a and the electrode terminal width D of the output electrode terminal 21a is defined so that (LD) <(P2-P1). ing.

In the liquid crystal display device 1a having the above structure,
Since P2> P1 based on such a rule, the line width of the extended electrode 18b (or 18c) is
The line width of the extended electrode 18b can be reduced by reducing the resistivity of the extended electrode 18b.
Even if it is longer than the wiring length of a, the resistance difference between both can be reduced, and furthermore, the resistance difference can be almost eliminated.
As a result, the signal waveform was not rounded, and display unevenness was prevented. Such (LD) is 10 to
When the thickness is 30 μm, preferably 20 to 24 μm, the variation in mounting of the face-down mounting device can be sufficiently absorbed.

In addition, when the drive semiconductor element 9a is face-down, if it swings from a predetermined disposition portion, the position of the electrode pad 20b and the output electrode terminal 21b of the drive semiconductor element 9a is reduced. Although the vibration is most remarkable, the degree of the vibration is reduced by making the pitch P2 larger than the pitch P1. By making the pitch difference (P2−P1) larger than (LD), a connection failure does not occur particularly between the electrode pad 20b and the output electrode terminal 21b, and the maximum effect is obtained. Have been obtained.

Next, as an example, the extended electrodes 18b, 1
8c has a wiring length of 2.5 mm.
a has a wiring length of 1 mm, a pitch P1 of 70 μm (width of the electrode pad 20a: 40 μm, a gap between the electrode pads 20a:
30 μm) and (LD) are 40 μm, the pitch P2 is set to 110 μm or more, so that the electrode pad 20 b and the output electrode are provided even if the drive semiconductor element 9 a shakes down when faced down. The connection failure with the terminal 21b no longer occurs. Then, the extended electrodes 18b, 1
The line width s of 8 c is 40 μm × (2.5 mm / 1 m
m) = 100 μm.

It should be noted that the present invention is not limited to the above embodiment, and various changes and improvements may be made without departing from the scope of the present invention. For example, in this embodiment, a description is given using a liquid crystal display device.
Instead, the same operation and effect can be obtained in other display devices such as an EL display device.

[0027]

As described above, according to the display device of the present invention, a large number of electrodes extend on the non-display portion region of the substrate having the display portion, and electrode pad groups are formed at the end portions. When face-down connection is made on the electrode pad group with each electrode terminal of the element, the driving semiconductor element having the electrode terminals arranged at a pitch P1 in the long side direction and at a pitch P2 in the short side direction is connected to the long side. The relationship between the extended dimension width L and the electrode terminal width D in the electrode pads arranged in the direction is (LD) <(P2
-P1), by disposing on the electrode pad group defined to be non-uniformity, it is possible to eliminate display unevenness and connection failure between the electrode terminal of the driving semiconductor element and the electrode pad of the extended electrode,
As a result, the production yield was increased, and the production cost was reduced. As a result, a low-cost, high-quality, high-reliability liquid crystal display device could be provided.

Further, in the present invention, the design conditions for eliminating both the display unevenness and the connection failure are defined, so that the manufacturing process management is facilitated and the production cost can be reduced. .

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a liquid crystal display device according to the present invention.

FIG. 2 is a sectional view taken along line YY shown in FIG.

FIG. 3 is a main part plan view of an electrode pad group of the liquid crystal display device according to the present invention.

FIG. 4 is a plan view of a COG type liquid crystal display device.

FIG. 5 is a sectional view taken along line XX shown in FIG. 1;

FIG. 6 is a sectional view of a main part of a liquid crystal display device of a COG system.

FIG. 7 is a plan view of a main part of a COG liquid crystal display device.

FIG. 8 is a plan view of a main part of an electrode pad group in a conventional liquid crystal display device.

FIG. 9 is a plan view showing a mounting deflection of the driving semiconductor element.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1, 1a Liquid crystal display device 2, 3 Transparent electrode 4 Scanning substrate 5 Signal side substrate 6 Sealing member 8 Liquid crystal 9, 9a Driving semiconductor element 11 Display part 12 Non-display part area 14, 14a, 14b, 14c, 18, 18a , 18
b, 18c extension electrode 15 input electrode 16a, 16b electrode pad 17a, 17b output electrode terminal 20a, 20b electrode pad 23 anisotropic conductive resin P1, P2 pitch L extension dimension width of electrode pad 20a D output electrode terminal Electrode terminal width

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) H05K 3/34 501 H05K 3/34 501E F term (Reference) 2H092 GA45 GA48 GA60 NA01 NA15 NA29 PA02 PA03 5C094 AA03 AA42 AA43 AA44 AA48 BA27 BA43 CA19 DA09 DB02 DB10 FA01 GB01 5E319 AA03 AB05 AC11 BB16 CC61 GG09 GG15 5E336 AA04 BC34 EE08 GG21 5F044 KK01 KK11 QQ02

Claims (1)

[Claims] 1. A large number of electrodes constituting the display section are extended on a non-display section area of a substrate having a rectangular display section such as a liquid crystal display or an EL display, and an electrode pad group is formed at an end thereof. A display device which is face-down connected to the electrode pad group with each electrode terminal of a long driving semiconductor element disposed substantially in parallel along the periphery of the display section, wherein a pitch P1 is set in a long side direction. In the above, the relationship between the extended dimension width L and the electrode terminal width D in the electrode pads arranged in the long side direction with respect to the driving semiconductor element in which the electrode terminals are arranged at the pitch P2 in the short side direction is (LD). A display device characterized by being disposed on an electrode pad group defined so as to satisfy (P2-P1).