U.S. patent application number 16/471783 was filed with the patent office on 2021-11-18 for touch panel and display device.
The applicant listed for this patent is WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO., LTD.. Invention is credited to Xiaoliang FENG.
Application Number | 20210357077 16/471783 |
Document ID | / |
Family ID | 1000005763596 |
Filed Date | 2021-11-18 |
United States Patent
Application |
20210357077 |
Kind Code |
A1 |
FENG; Xiaoliang |
November 18, 2021 |
TOUCH PANEL AND DISPLAY DEVICE
Abstract
The present invention provides a touch panel and a display
device. The touch panel includes multiple first electrode chains
and multiple second electrode chains. Each of the first electrode
chains includes multiple first electrodes electrically connected
through bridging layers. Each of the first electrodes, the bridging
layers, and the second electrode chains consists of mesh metal
lines. Each of the first electrode includes a first mesh metal line
defect portion, and each of the second electrode chain includes
multiple second mesh metal line defect portions. The bridging
layers are complementary to the first mesh metal line defect
portions and the second mesh metal line defect portions.
Inventors: |
FENG; Xiaoliang; (Wuhan,
Hubei, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY
CO., LTD. |
Wuhan, Hubei |
|
CN |
|
|
Family ID: |
1000005763596 |
Appl. No.: |
16/471783 |
Filed: |
March 13, 2019 |
PCT Filed: |
March 13, 2019 |
PCT NO: |
PCT/CN2019/077928 |
371 Date: |
June 20, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G06F 2203/04112
20130101; G06F 3/0412 20130101; G06F 3/0446 20190501 |
International
Class: |
G06F 3/044 20060101
G06F003/044; G06F 3/041 20060101 G06F003/041 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 13, 2018 |
CN |
201811525540.6 |
Claims
1. A touch panel, comprising: a touch region, the touch region
comprising a plurality of first electrode chains and a plurality of
second electrode chains which are intersected with and electrically
insulated from each other; and a wiring region and a bonding
region, the wiring region comprising a plurality of touch control
lines, one end of each of the touch control lines being connected
to one of the first electrode chains or one of the second electrode
chains, the other end of each of the touch control lines being
extended to the bonding region through the wiring region; wherein a
plurality of first electrodes are spaced apart at intersections of
the first electrode chains and the second electrode chains, and
each adjacent two of the first electrodes in the first electrode
chain are electrically connected to each other through a bridging
layer, wherein each of the first electrodes, the bridging layers,
and the second electrode chains consists of a plurality of mesh
metal lines, and wherein each first electrode comprises a first
mesh metal line defect portion, each second electrode chain
comprises a plurality of second mesh metal line defect portions,
and each bridging layer comprises a third mesh metal line defect
portion; and wherein each first mesh metal line defect portion is
arranged corresponding to and is complementary to a vertical
projection of each bridging layer projected onto a corresponding
one of the first electrodes, and each second mesh metal line defect
portion is arranged corresponding to and is complementary to a
vertical projection of each bridging layer projected onto a
corresponding one of the second electrode chains.
2. The touch panel according to claim 1, wherein the mesh metal
lines comprise a plurality of first metal lines and a plurality of
second metal lines intersected with each other, each of the second
electrode chains comprises a plurality of second electrodes, and
each adjacent two of the second electrodes are electrically
connected through corresponding ones of the second metal lines.
3. The touch panel according to claim 2, wherein the first mesh
metal line defect portions and the third mesh metal line defect
portions both exclude the second metal lines, and the second mesh
metal line defect portions exclude the first metal lines.
4. The touch panel according to claim 3, wherein each second mesh
metal line defect portion and each third mesh metal line defect
portion are both disposed at a corresponding one of intersections
of the bridging layers and the second electrode chains.
5. The touch panel according to claim 2, wherein the first mesh
metal line defect portions and the second mesh metal line defect
portions both exclude the first metal lines, and the third mesh
metal line defect portions exclude the second metal lines.
6. The touch panel according to claim 5, wherein each second mesh
metal line defect portion is disposed at a corresponding one of
intersections of the bridging layers and the second electrode
chains, each third mesh metal line defect portion is disposed at a
corresponding one of intersections of the bridging layers and the
second electrode chains, and two ends of each bridging layer are
disposed corresponding to corresponding two of the first mesh metal
line defect portions.
7. The touch panel according to claim 2, wherein each bridging
layer is connected to each of adjacent two of the first electrodes
through a via hole at a bridging connection position, and each
bridging layer and each second electrode chain are electrically
insulated from each other.
8. The touch panel according to claim 7, wherein the bridging
connection positions are at the intersections of the first metal
lines and the second metal lines.
9. A display device, comprising a plurality of pixel units and the
touch panel of claim 1, wherein each first electrode chain and each
second electrode chain are disposed in a gap between adjacent two
of the pixel units.
10. A touch panel, comprising: a touch region, the touch region
comprising a plurality of first electrode chains and a plurality of
second electrode chains which are intersected with and electrically
insulated from each other; and a plurality of first electrodes
spaced apart from each other at intersections of the first
electrode chains and the second electrode chains, each adjacent two
of the first electrodes in a corresponding one of the first
electrode chains are electrically connected to each other through a
bridging layer; wherein each of the first electrodes, the bridging
layers, and the second electrode chains consists of a plurality of
mesh metal lines; each of the first electrodes comprises a first
mesh metal line defect portion, each of the second electrode chains
comprises a plurality of second mesh metal line defect portions,
and each bridging layer comprises a third mesh metal line defect
portion; wherein each first mesh metal line defect portion is
arranged corresponding to and is complementary to a vertical
projection of each bridging layer projected onto a corresponding
one of the first electrodes; each second mesh metal line defect
portion is arranged corresponding to and is complementary to a
vertical projection of each bridging layer projected onto a
corresponding one of the second electrode chains.
11. The touch panel according to claim 10, wherein the mesh metal
lines comprise a plurality of first metal lines and a plurality of
second metal lines intersected with each other, each of the second
electrode chains comprises a plurality of second electrodes, and
each adjacent two of the second electrodes are electrically
connected through corresponding ones of the second metal lines.
12. The touch panel according to claim 11, the first mesh metal
line defect portions and the third mesh metal line defect portions
both exclude the second metal lines, and the second mesh metal line
defect portions exclude the first metal lines.
13. The touch panel according to claim 12, wherein each second mesh
metal line defect portion and each third mesh metal line defect
portion are both disposed at a corresponding one of intersections
of the bridging layers and the second electrode chains.
14. The touch panel according to claim 11, wherein the first mesh
metal line defect portions and the second mesh metal line defect
portions both exclude the first metal lines, and the third mesh
metal line defect portions exclude the second metal lines.
15. The touch panel according to claim 14, wherein each second mesh
metal line defect portion is disposed at a corresponding one of
intersections of the bridging layers and the second electrode
chains, each third mesh metal line defect portion is disposed at a
corresponding one of intersections of the bridging layers and the
second electrode chains, and two ends of each bridging layer are
disposed corresponding to corresponding two of the first mesh metal
line defect portions.
16. The touch panel according to claim 11, wherein each bridging
layer is connected to each of adjacent two of the first electrodes
through a via hole at a bridging connection position, and each
bridging layer and each second electrode chain are electrically
insulated from each other.
17. The touch panel according to claim 16, wherein each bridging
connection position is disposed at a corresponding one of the
intersections of the first metal lines and the second metal lines.
Description
1. FIELD OF DISCLOSURE
[0001] The present invention relates to a field of display devices
and in particular, to a touch panel and a display device.
2. DESCRIPTION OF RELATED ART
[0002] At present, touch panels generally include a carrier layer
and a touch structure formed on the carrier layer, and touch
positions are sensed by a capacitance change of the touch
structure. With development of touch panels, metal mesh
mutual-capacitive touch structures are increasingly used in
production due to their excellent performance. However, the metal
mesh mutual-capacitive touch structures are often affected by
bridging point connection manners. Conditions in bridging point
connection, such as poor linking or stacking position deviation,
may cause bridging point connection lines to appear widened, which
results in optical defects or even local moire patterns.
[0003] Therefore, conventional techniques have drawbacks and are in
urgent need of improvement.
SUMMARY
[0004] The present invention provides a touch panel and a display
device, which can improve stacking position deviation between a
bridging layer and an electrode pattern layer, thereby avoiding
optical defects or local moire patterns.
[0005] In order to solve the above-mentioned problem, the present
invention provides a touch panel, comprising:
[0006] a touch region, the touch region comprising a plurality of
first electrode chains and a plurality of second electrode chains
which are intersected with and electrically insulated from each
other; and
[0007] a wiring region and a bonding region, the wiring region
comprising a plurality of touch control lines, one end of each of
the touch control lines being connected to one of the first
electrode chains or one of the second electrode chains, the other
end of each of the touch control lines being extended to the
bonding region through the wiring region;
[0008] wherein a plurality of first electrodes are spaced apart at
intersections of the first electrode chains and the second
electrode chains, and each adjacent two of the first electrodes in
the first electrode chain are electrically connected to each other
through a bridging layer, wherein each of the first electrodes, the
bridging layers, and the second electrode chains consists of a
plurality of mesh metal lines, and wherein each first electrode
comprises a first mesh metal line defect portion, each second
electrode chain comprises a plurality of second mesh metal line
defect portions, and each bridging layer comprises a third mesh
metal line defect portion; and
[0009] wherein each first mesh metal line defect portion is
arranged corresponding to and is complementary to a vertical
projection of each bridging layer projected onto a corresponding
one of the first electrodes, and each second mesh metal line defect
portion is arranged corresponding to and is complementary to a
vertical projection of each bridging layer projected onto a
corresponding one of the second electrode chains.
[0010] In the touch panel of the present invention, the mesh metal
lines comprise a plurality of first metal lines and a plurality of
second metal lines intersected with each other, each of the second
electrode chains comprises a plurality of second electrodes, and
each adjacent two of the second electrodes are electrically
connected through corresponding ones of the second metal lines.
[0011] In the touch panel of the present invention, the first mesh
metal line defect portions and the third mesh metal line defect
portions both exclude the second metal lines, and the second mesh
metal line defect portions exclude the first metal lines.
[0012] In the touch panel of the present invention, each second
mesh metal line defect portion and each third mesh metal line
defect portion are both disposed at a corresponding one of
intersections of the bridging layers and the second electrode
chains.
[0013] In the touch panel of the present invention, the first mesh
metal line defect portions and the second mesh metal line defect
portions both exclude the first metal lines, and the third mesh
metal line defect portions exclude the second metal lines.
[0014] In the touch panel of the present invention, each second
mesh metal line defect portion is disposed at a corresponding one
of intersections of the bridging layers and the second electrode
chains, each third mesh metal line defect portion is disposed at a
corresponding one of intersections of the bridging layers and the
second electrode chains, and two ends of each bridging layer are
disposed corresponding to corresponding two of the first mesh metal
line defect portions.
[0015] In the touch panel of the present invention, each bridging
layer is connected to each of adjacent two of the first electrodes
through a via hole at a bridging connection position, and each
bridging layer and each second electrode chain are electrically
insulated from each other.
[0016] In the touch panel of the present invention, each bridging
connection position is at a corresponding one of intersections of
the first metal lines and the second metal lines.
[0017] Accordingly, the present invention provides a display
device, comprising a plurality of pixel units and the touch panel
mentioned above, wherein each first electrode chain and each second
electrode chain are disposed in a gap between adjacent two of the
pixel units.
[0018] In order to solve the above-mentioned problem, the present
invention provides a touch panel, comprising:
[0019] a touch region, the touch region comprising a plurality of
first electrode chains and a plurality of second electrode chains
which are intersected with and electrically insulated from each
other; and
[0020] a plurality of first electrodes spaced apart from each other
at intersections of the first electrode chains and the second
electrode chains, each adjacent two of the first electrodes in a
corresponding one of the first electrode chains are electrically
connected to each other through a bridging layer;
[0021] wherein each of the first electrodes, the bridging layers,
and the second electrode chains consists of a plurality of mesh
metal lines; each of the first electrodes comprises a first mesh
metal line defect portion, each of the second electrode chains
comprises a plurality of second mesh metal line defect portions,
and each bridging layer comprises a third mesh metal line defect
portion;
[0022] wherein each first mesh metal line defect portion is
arranged corresponding to and is complementary to a vertical
projection of each bridging layer projected onto a corresponding
one of the first electrodes; each second mesh metal line defect
portion is arranged corresponding to and is complementary to a
vertical projection of each bridging layer projected onto a
corresponding one of the second electrode chains.
[0023] In the touch panel of the present invention, the mesh metal
lines comprise a plurality of first metal lines and a plurality of
second metal lines intersected with each other, each of the second
electrode chains comprises a plurality of second electrodes, and
each adjacent two of the second electrodes are electrically
connected through each second metal line.
[0024] In the touch panel of the present invention, the first mesh
metal line defect portions and the third mesh metal line defect
portions both exclude the second metal lines, and the second mesh
metal line defect portions exclude the first metal lines.
[0025] In the touch panel of the present invention, each second
mesh metal line defect portion and each third mesh metal line
defect portion are both disposed at a corresponding one of
intersections of the bridging layers and the second electrode
chains.
[0026] In the touch panel of the present invention, the first mesh
metal line defect portions and the second mesh metal line defect
portions both exclude the first metal lines, and the third mesh
metal line defect portions exclude the second metal lines.
[0027] In the touch panel of the present invention, each second
mesh metal line defect portion is disposed at a corresponding one
of intersections of the bridging layers and the second electrode
chains, each third mesh metal line defect portion is disposed at a
corresponding one of intersections of the bridging layers and the
second electrode chains, and two ends of each bridging layer are
disposed corresponding to corresponding two of the first mesh metal
line defect portions.
[0028] In the touch panel of the present invention, each bridging
layer is connected to each of adjacent two of the first electrodes
through a via hole at a bridging connection position, and each
bridging layer and each second electrode chain are electrically
insulated from each other.
[0029] In the touch panel of the present invention, each bridging
connection position is disposed at a corresponding one of
intersections of the first metal lines and the second metal
lines.
[0030] Compared with the existing touch panels, advantages of the
touch panel and the display device provided by the present
invention are as follows: the bridging layer cooperates with the
first electrode chain and the second electrode chain, thereby
reducing overlapping metal lines in directions vertical to the
first electrode chains and the second electrode chains, such that
the bridging layer is connected to the first electrode chain
through the via holes at the bridging connection positions only.
Excluding the bridging connection positions, and at positions
corresponding to the bridging layer, the first electrode chains and
the second electrode chains don't have metal lines arranged in same
directions of the metal lines of the bridging layer. This avoids
widening of the metal lines caused by alignment deviation between
upper and lower layers, thus improving stacking position deviation.
In addition, connection through the via holes can be realized
easily with high precision in manufacturing processes.
BRIEF DESCRIPTION OF DRAWINGS
[0031] In order to more clearly illustrate the embodiments of the
present disclosure or related art, figures which will be described
in the embodiments are briefly introduced hereinafter. It is
obvious that the drawings are merely for the purposes of
illustrating some embodiments of the present disclosure, and a
person having ordinary skill in this field can obtain other figures
according to these figures without an inventive work or paying the
premise.
[0032] FIG. 1 is a schematic structural view illustrating a touch
panel of the present invention;
[0033] FIG. 2 is an enlarged view of an area A in FIG. 1;
[0034] FIG. 3 is a schematic view showing a bridging layer, first
electrodes, and second electrodes, presented in an independent
manner from other, according to one embodiment of the present
invention;
[0035] FIG. 4 is another schematic view showing the bridging layer,
the first electrodes, and the second electrodes, presented in an
independent manner from each other, according to one embodiment of
the present invention;
[0036] FIG. 5 is a cross-sectional view taken along line A-A of
FIG. 2; and
[0037] FIG. 6 is a cross-sectional view taken along line B-B of
FIG. 2.
DETAILED DESCRIPTION OF EMBODIMENTS
[0038] Embodiments of the present disclosure are described in
detail with reference to the accompanying drawings as follows.
Directional terms such as up/down, front/rear, right/left,
inside/outside, and the like may be used for the purpose of
enhancing a reader's understanding about the accompanying drawings,
but are not intended to be limiting. Specifically, the
terminologies in the embodiments of the present disclosure are
merely for the purpose of describing certain embodiments, but not
intended to limit the scope of the invention. The same reference
numbers are used throughout the drawings to refer to the same or
similar parts.
[0039] The present invention is directed to solving an existing
problem in conventional touch panels. The problem is that the metal
mesh-like bridging layer and the electrode layer may have a
stacking position deviation, which causes connection lines of the
bridging layer to appear to be widened, thereby causing optical
defects and even local moire patterns. The present invention can
solve this problem.
[0040] Please refer to FIG. 1, which is a schematic structural view
illustrating a touch panel according to one embodiment of the
present invention. The touch panel comprises a touch region 10, a
wiring region 20, and a bonding region 30 disposed at one side of
the touch region 10. The touch region 10 comprises a plurality of
first electrode chains 101 and a plurality of second electrode
chains 102 which are intersected with and electrically insulated
from each other. A plurality of first electrodes 101a are spaced
apart at intersections of the first electrode chains 101 and the
second electrode chains 102. Each second electrode chain 102
comprises a plurality of second electrodes 102a connected through a
metal at a layer the same as a layer of the second electrode chains
102. The first electrodes 101a and the second electrodes 102a are
produced at the same layer. Each adjacent two of the first
electrodes 101a in the first electrode chain 101 are electrically
connected to each other through a bridging layer 103.
[0041] According to one embodiment of the present invention, each
first electrode 101a is a touch electrode, and each second
electrode 102a is a sensing electrode.
[0042] The wiring region 20 comprises a plurality of touch control
lines 201. One end of each of the touch control lines 201 is
connected to one of the first electrode chains 101 or one of the
second electrode chains 102, the other end of each of the touch
control lines 201 is extended to the bonding region 30 through the
wiring region 20.
[0043] Please refer to FIG. 2, which is an enlarged view of area A
in FIG. 1. Each of the first electrodes 101a, the bridging layers
103, and the second electrode chains 102 consists of a plurality of
mesh metal lines. The mesh metal lines comprise a plurality of
first metal lines 104 (i.e., vertical metal lines in the drawing)
and a plurality of second metal lines 105 (i.e., horizontal metal
lines in the drawing) intersected with each other. Each adjacent
two of the second electrodes 102a in each second electrode chain
102 are electrically connected through corresponding ones of the
second metal lines 105. Each bridging layer 103 is connected to
each of adjacent two of the first electrodes 101a through via holes
at bridging connection positions a, b, c, a', b', c', and each
bridging layer 103 and each second electrode chain 102 are
electrically insulated from each other.
[0044] According to one embodiment of the present invention, the
bridging connection positions a, b, c, a', b', c' are disposed at
the intersections of the first metal lines 104 and the second metal
lines 105. The bridging connection positions a, b, c, a', b', c'
are disposed at edges of the first electrodes 101a or inside the
first electrodes 101a.
[0045] Referring to FIGS. 2 and 3, FIG. 3 shows the bridging layer,
the first electrodes, and the second electrodes, presented in an
independent manner from each other, according to the present
embodiment. In the drawing, each first electrode 101a comprises a
first mesh metal line defect portion 101b, each second electrode
chain 102 comprises a plurality of second mesh metal line defect
portions 102b, and each bridging layer 103 comprises a third mesh
metal line defect portion 103b. The first mesh metal line defect
portions 101b and the third mesh metal line defect portions 103b
both exclude the second metal lines 105, and the second mesh metal
line defect portions 102b exclude the first metal lines 104. Each
second mesh metal line defect portion 102b and each third mesh
metal line defect portion 103b are both disposed at a corresponding
one of intersections of the bridging layers 103 and the second
electrode chains 102.
[0046] Two ends of each bridging layer 103 are connected to
adjacent two of the first electrodes 101a through the respective
via holes at the bridging connection positions a, b, c, a', b', c'.
The first metal lines 104 in each bridging layer 103 are aligned
with the first metal lines 104 of adjacent two first electrodes
101a and are connected to the adjacent two first electrodes 101a at
the bridging connection positions a, b, c, a', b', c'.
[0047] A length of each second metal line 105 in the bridging layer
103 is equal to a length of the second metal line 105 missing at
the first mesh metal line defect portion 101b. In other words, each
first mesh metal line defect portion 101b is arranged corresponding
to and is complementary to a vertical projection of each bridging
layer 103 projected onto a corresponding one of the first
electrodes 101a. Each second mesh metal line defect portion 102b is
arranged corresponding to and is complementary to a vertical
projection of each bridging layer 103 projected onto a
corresponding one of the second electrode chains 102.
[0048] As shown in FIG. 2, the mesh metal lines of the bridging
layers 103 are complementary to the mesh metal lines of the first
electrodes 101a and the second electrode chains 102. That is to
say, in an area of the vertical projection of each bridging layer
103, the mesh metal lines of the first electrodes 101a and the mesh
metal lines of the bridging layers 103 are not in a same direction;
in an area of the vertical projection of each bridging layer 103,
the mesh metal lines of the second electrode chains 102 and the
mesh metal lines of the bridging layer 103 are not in a same
direction. As shown in the drawing, the vertical projection of each
bridging layer 103 projected onto a corresponding one of the first
electrodes 101a fills the second metal line 105 missing in the
first mesh metal line defect portion 101b. The vertical projection
of each bridging layer 103 projected onto a corresponding one of
the second electrode chains 102 fills the first metal line 104
missing in the first mesh metal line defect portion 102b. This way,
the mesh metal lines of the bridging layers 103 and the second
electrode chains 102 only intersect, and there is no overlap; the
mesh metal lines of the bridging layers 103 and the mesh metal
lines of the first electrodes 101a are connected only at the
bridging connection positions without overlap. Therefore, the
configuration avoids widening of the metal lines due to alignment
deviation between upper and lower layers, thereby improving
stacking position deviation.
[0049] Please refer to FIG. 4, which is another schematic view of
the present embodiment, illustrating the bridging layers, the first
electrodes, and the second electrodes, presented in a manner
independent from each other. FIG. 4 is different from FIG. 3 in
that the first mesh metal line defect portion 101b of each first
electrode 101a lacks the first metal line 104; each second mesh
metal line defect portion 102b of each second electrode chain 102
also lacks the first metal line 104; the third mesh metal line
defect portion 103b of the bridging layer 103 lacks the second
metal line 105. The second mesh metal line defect portions 102b are
located at intersections of the bridging layers 103 and the second
electrode chains 102. The third mesh metal line defect portions
103b are located at intersections of the bridging layers 103 and
the second electrode chains 102. Two ends of each bridging layer
103 are arranged corresponding to corresponding two of the first
mesh metal line defect portions 101b. The first metal lines 104 in
the bridging layers 103 are connected to the first electrodes 101a
through bridging connection positions a, b, c, a', b', c', wherein
the bridging connection positions a, b, c, a', b', c' are located
inside the first electrodes 101a.
[0050] Please refer to FIG. 5, which is a cross-sectional view
taken along line A-A of FIG. 2. The drawing shows a substrate 100,
a first insulating layer 200, and a second insulating layer 300,
and the drawing shows that the bridging layer 103 is connected to
the first electrode 101a through the via holes 201 at the bridging
connection positions a, b, c.
[0051] Please refer to FIG. 6, which is a cross-sectional view
taken along line B-B of FIG. 2. As shown in the drawing, the
bridging layer 103 is connected to the first electrodes 101a
through the via holes at the bridging connection positions c', c.
The bridging layer 103 is electrically insulated from the second
electrode chain at intersections e, f, g of the second electrode
chain and the bridging layer 103.
[0052] The present invention provides a display device. The display
device comprises a plurality of pixel units and the touch panel
mentioned above. The display device can be an add-on touch type or
an embedded touch type. The first electrode chains and the second
electrode chains are disposed at a gap between each two adjacent
pixel units.
[0053] In the touch panel and the display device provided by the
present invention, the bridging layers cooperates with the first
electrode chains and the second electrode chains, thereby reducing
overlapping metal lines in directions vertical to the first
electrode chains and the second electrode chains, such that the
bridging layers are connected to the first electrode chains through
the via holes at the bridging connection positions only. Excluding
the bridging connection positions and at positions corresponding to
the bridging layers, the metal lines of the first electrode chains
and the metal lines of the second electrode chains are not in same
directions of the metal lines of the bridging layer. This avoids
widening of the metal lines caused by alignment deviation between
upper and lower layers, thus improving stacking position deviation.
In addition, connection through the via holes can be realized
easily with high precision in the manufacturing process.
[0054] It is to be understood that the above descriptions are
merely the preferable embodiments of the present invention and are
not intended to limit the scope of the present invention.
Equivalent changes and modifications made in the spirit of the
present invention are regarded as falling within the scope of the
present invention.
* * * * *