U.S. patent application number 11/181986 was filed with the patent office on 2005-11-10 for display device.
This patent application is currently assigned to ADVANCED DISPLAY INC.. Invention is credited to Hirosue, Miyuki, Nakayama, Akio.
Application Number | 20050248713 11/181986 |
Document ID | / |
Family ID | 28672180 |
Filed Date | 2005-11-10 |
United States Patent
Application |
20050248713 |
Kind Code |
A1 |
Hirosue, Miyuki ; et
al. |
November 10, 2005 |
Display device
Abstract
A display device comprises scan lines on a insulating substrate,
signal lines intersecting with the scan lines with an insulating
film interposed therebetween, a display area comprising pixel
electrodes connected to the signal lines, a scan line driver
circuit connected to the scan lines, a signal line driver circuit
connected to the signal lines. The scan line driver circuit and the
signal line driver circuit are mounted directly on the insulating
substrate outside of the display area and close to one side of the
display area. Lines connecting the scan line driver circuit and the
signal line driver circuit are formed in an area in which the scan
line driver circuit and the signal line driver circuit are
mounted.
Inventors: |
Hirosue, Miyuki;
(Kikuchi-gun, JP) ; Nakayama, Akio; (Kikuchi-gun,
JP) |
Correspondence
Address: |
OBLON, SPIVAK, MCCLELLAND, MAIER & NEUSTADT, P.C.
1940 DUKE STREET
ALEXANDRIA
VA
22314
US
|
Assignee: |
ADVANCED DISPLAY INC.
Kikuchi-gun
JP
|
Family ID: |
28672180 |
Appl. No.: |
11/181986 |
Filed: |
July 15, 2005 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
11181986 |
Jul 15, 2005 |
|
|
|
10403086 |
Apr 1, 2003 |
|
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Current U.S.
Class: |
349/158 |
Current CPC
Class: |
G02F 1/133354 20210101;
G02F 1/13452 20130101; G02F 1/133351 20130101; G02F 1/1345
20130101 |
Class at
Publication: |
349/158 |
International
Class: |
G02F 001/1333 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 4, 2002 |
JP |
2002-102051 |
Claims
1-11. (canceled)
12. A display device comprising: an opposing substrate opposite to
a insulating substrate with liquid crystals interposed
therebetween; a plurality of liquid crystal panels formed in the
opposing substrate and the insulating substrate, wherein an
alignment mark or a mark for confirmation after alignment is formed
on the opposing substrate for cutting a liquid crystal panel off
the opposing substrate and the insulating substrate.
Description
BACKGROUND OF THE INVENTION
[0001] 1 . Field of the Invention
[0002] The present invention relates to a display device which is
driven by driver circuits and more particularly to a preferred
display device that is applied to a liquid crystal display
device.
[0003] 2 . Related Background Art
[0004] Display devices which are employed in conventional liquid
crystal display monitor devices or notebook computers and the like
require a display pixel count of 480.times.640 even for a small VGA
(Video Graphic Array) mode display device, and require drive signal
lines pertaining to several hundred levels. Where active matrix
drive-type display devices are concerned, a plurality of respective
driver circuits is needed to drive the sources or gates of the thin
film transistors. Accordingly, the driver circuits or TCPs (Tape
Carrier Packages) which afford a connection to the driver circuits
are disposed on extending lines on the same side of the drive
signal lines within the display region.
[0005] In small and medium display devices such as those in
cellular telephones, PDAs (Personal Digital Assistants) and the
like which have achieved rapid growth in recent years as
application fields for liquid crystal display devices, there are
cases of there being one driver circuit for the drive of the source
lines and gate lines due to the relatively small display pixel
count. However, in this case, with methods that involve the
placement of TCPs or driver circuits on extending lines of the
drive signal lines of the display region as per the prior art,
there have been problems such as the great complications involved
in implementing the miniaturization of the display device. In cases
where there is a concentration of the driver circuits, and the
flexible substrates that supply a potential from outside the liquid
crystal panels to these driver circuits, and so forth, in the
vicinity of one side of the display region, and, at the same time,
the side periphery region whereon these driver circuits and
flexible substrates and so forth are mounted which excludes the
display region is reduced, the layout of the wiring from the driver
circuits to the display region, the placement of transfer
electrodes that supply a potential to the opposing electrodes of
the opposing substrate and of cutting or overlap marks, and the
placement of the input/output terminals of the driver circuits and
the wiring that is connected to these terminals, and so forth, is
problematic. There has also been the problem of the wiring
resistance required for the display characteristics not being
satisfied or the manufacturing yield being reduced.
SUMMARY OF THE INVENTION
[0006] In view of the foregoing problems, it is an object of the
present invention to provide a display device that makes
miniaturization possible without there being a reduction in the
display characteristics and the manufacturing yield.
[0007] The first display device according to the present invention
is a display device having scan lines on a insulating substrate;
signal lines intersecting with the scan lines with an insulating
film interposed therebetween; a display area comprising pixel
electrodes connected to the signal lines; a scan line driver
circuit connected to the scan lines; a signal line driver circuit
connected to the signal lines, wherein the scan line driver circuit
and the signal line driver circuit are mounted directly on the
insulating substrate outside of the display area and close to one
side of the display area, and lines connecting the scan line driver
circuit and the signal line driver circuit are formed in an area in
which the scan line driver circuit and the signal line driver
circuit are mounted.
[0008] The second display device according to the present invention
is a display device according to the first display device, wherein
at least a part of lines connecting the scan line driver circuit
and the scan lines in the display area is formed in an area in
which the signal line driver circuit is mounted.
[0009] The third display device according to the present invention
is a display device according to the first display device, wherein
at least a part of lines connecting the signal line driver circuit
and the signal lines in the display is formed in an area in which
the scan line driver circuit is mounted.
[0010] The fourth display device according to the present invention
is a display device according to the first display device, wherein
lines connecting the scan line driver circuit and the scan lines
intersect with lines connecting the signal line driver circuit and
the signal lines in the display area with a insulating film
interposed therebetween.
[0011] The fifth display device according to the present invention
is a display device according to the first display device, wherein
a ratio of a line width to a space between lines is a predetermined
value in substantially all area in which lines connecting the scan
line driver circuit and the scan lines in the display area are
formed.
[0012] The sixth display device according to the present invention
is a display device according to the first display device, wherein
a ratio of a line width to a line interval is a predetermined value
in substantially all area in which lines connecting the signal line
driver circuit and the signal lines in the display area are
formed.
[0013] The seventh display device according to the present
invention is a display device having scan lines on a insulating
substrate; signal lines intersecting with the scan lines with a
insulating film interposed therebetween; a display area comprising
pixel electrodes connected to the signal lines; a scan line driver
circuit connected to the scan lines; a signal line driver circuit
connected to the signal lines; an opposing substrate opposite to
the insulating substrate, wherein the scan line driver circuit and
the signal line driver circuit are mounted directly on the
insulating substrate outside of the display area and close to one
side of the display area, and a transfer electrode on the
insulating substrate for supplying a potential to an opposite
electrode on the opposing substrate is formed close to a side
opposite to the one side of the display area to which the scan line
driver circuit and the signal line driver circuit are mounted
close.
[0014] The eighth display device according to the present invention
is a display device according to the seventh display device,
wherein lines connecting the scan line driver circuit and the
signal line driver circuit are formed in an area in which the scan
line driver circuit and the signal line driver circuit are
mounted.
[0015] The ninth display device according to the present invention
is a display device having scan lines on a insulating substrate;
signal lines intersecting with the scan lines with a insulating
film interposed therebetween; a display area comprising pixel
electrodes connected to the signal lines; a scan line driver
circuit connected to the scan lines; a signal line driver circuit
connected to the signal lines; a flexible substrate providing a
scan potential to the scan line circuit and a signal potential to
the signal line circuit from outside, wherein the scan line driver
circuit and the signal line driver circuit are mounted directly on
the insulating substrate outside of the display area and close to
one side of the display area, and a common alignment mark is formed
for mounting the scan line driver circuit and the signal line
driver circuit on the insulating substrate and mounting the
flexible substrate on the insulating substrate.
[0016] The tenth display device according to the present invention
is a display device having scan lines on a insulating substrate;
signal lines intersecting with the scan lines with a insulating
film interposed therebetween; a display area comprising pixel
electrodes connected to the signal lines; a scan line driver
circuit connected to the scan lines; a signal line driver circuit
connected to the signal lines; a flexible substrate providing a
scan potential to the scan line circuit and a signal potential to
the signal line circuit from outside, wherein the scan line driver
circuit and the signal line driver circuit are mounted directly on
the insulating substrate outside of the display area and close to
one side of the display area, and terminals on the insulating
substrate connecting the flexible substrate and the scan line
driver circuit or the signal line driver circuit, and lines
connecting terminals of the flexible substrate and the scan line
driver circuit or the signal line driver circuit, are formed wider
with the longer lines.
[0017] The eleventh display device according to the present
invention is a display device having a display area comprising a
plurality of pixels; scan lines on a insulating substrate; signal
lines intersecting with the scan lines with a insulating film
interposed therebetween; pixel electrodes connected to the signal
lines; a scan line driver circuit connected to the scan lines; a
signal line driver circuit connected to the signal lines; a
flexible substrate providing a potential scan to the scan line
circuit and a potential signal to the signal line circuit from
outside, wherein the scan line driver circuit and the signal line
driver circuit are mounted directly on the insulating substrate
outside of the display area and close to one side of the display
area, and a dummy terminal, which is not connected to the scan line
driver circuit nor the signal line driver circuit, is formed
between or at the outermost side of terminals on the insulating
substrate connecting the flexible substrate and the scan line
driver circuit or the signal line driver circuit.
[0018] The twelfth display device according to the present
invention is a display device having an opposing substrate opposite
to a insulating substrate with liquid crystals interposed
therebetween; a plurality of liquid crystal panels formed in the
opposing substrate and the insulating substrate, wherein an
alignment mark or a mark for confirmation after alignment is formed
on the opposing substrate for cutting a liquid crystal panel off
the opposing substrate and the insulating substrate.
[0019] The present invention will become more fully understood from
the detailed description given hereinbelow and the accompanying
drawings which are given by way of illustration only, and thus are
not to be considered as limiting the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0020] FIG. 1 is a plan view of a liquid crystal display device
according to the first embodiment of the present invention.
[0021] FIG. 2 is a cross-sectional view along line A-A in FIG.
1.
[0022] FIG. 3 is a plan view of a liquid crystal display device
according to the second embodiment of the present invention.
[0023] FIG. 4 is a plan view of a liquid crystal display device
according to the third embodiment of the present invention.
[0024] FIG. 5 is a plan view of a liquid crystal display device
according to the fourth embodiment of the present invention.
[0025] FIG. 6 is another plan view of a liquid crystal display
device according to the fourth embodiment of the present
invention.
[0026] FIG. 7 is a plan view of a liquid crystal display device
according to the fifth embodiment of the present invention.
[0027] FIG. 8 is another plan view of a liquid crystal display
device according to the fifth embodiment of the present
invention.
[0028] FIG. 9 is another plan view of a liquid crystal display
device according to the fifth embodiment of the present
invention.
[0029] FIG. 10 is a plan view of a liquid crystal display device
according to the sixth embodiment of the present invention.
[0030] FIG. 11 is another plan view of a liquid crystal display
device according to the sixth embodiment of the present
invention.
[0031] FIG. 12 is an explanatory view of a liquid crystal display
device according to the seventh embodiment of the present
invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0032] First Embodiment
[0033] A first embodiment of the present invention will be
described by means of FIGS. 1 and 2. FIG. 1 is a planar view of the
liquid crystal display device according to the first embodiment of
the present invention, and FIG. 2 is a cross-section along the line
A-A in FIG. 1.
[0034] In FIGS. 1 and 2, 1 denotes an insulating substrate
constituted by a glass substrate, for example; 2 denotes an
opposing substrate; 3 denotes a display region that comprises pixel
electrodes, and so forth; 4 denotes a scan line driver circuit; 5
denotes a signal line driver circuit; 6 denotes a group of lines
that connects scan lines on one side of the display region and a
scan line driver circuit; 7 denotes a group of lines that connects
scan lines on a side that lies opposite to the one side of the
display region and the scan line driver circuit; 8 denotes a group
of lines that connects the signal lines of the display region and
the signal line driver circuit; 9 denotes connecting lines that
connects the scan line driver circuit and the signal line driver
circuit; 10 denotes driver-circuit connecting terminals which are
formed on the insulating substrate; 11 denotes a sealing material;
12 denotes connection material; and 13 denotes liquid crystals.
Further, in this specification, `a group of lines` indicates an
arbitrary number of lines such as scan lines or signal lines.
[0035] As shown in FIGS. 1 and 2, display material such as liquid
crystals 13 and the like, for example, is first filled and sealed
with sealant 11 between the insulating substrate 1 and the opposing
substrate 2, and then driver circuits 4 and 5, which drive a liquid
crystal display device, are directly mounted by means of connection
material 12 on the insulating substrate 1 in a region excluding the
display area and being in the vicinity of an arbitrary side of the
display region. In the case of a so-called double-sided input in
which scan lines 6 and 7, which are connected from the scan line
driver circuit 4 to the display region, for example, are connected
to one side of the display region and to another side opposite to
the one side, at least a part of the group of scan lines 6, which
is connected to one side of the display region, is formed in a
region on the insulating substrate in which the signal line driver
circuit is mounted so as to detour around the group of signal lines
8 that connects the signal line driver circuit and the signal lines
of the display region, and the section of the connection between
the group of signal lines 8 and the signal line driver circuit.
Further, at least a part of the connecting wiring 9 that connects
the scan line driver circuit 4 and the signal line driver circuit 5
is formed in a region on the insulating substrate in which the
driver circuits 4 and 5 are mounted.
[0036] As a result of the above constitution, in the case of a
liquid crystal display device in which a scan line driver circuit
and a signal line driver circuit are mounted directly on an
insulating substrate close to one side of a display region, the
display device can be miniaturized by making the wiring regions
excluding the mount regions of the driver circuits extremely small.
Further, in the present embodiment, an example is illustrated in
which a constitution for the group of scan lines 6 and a
constitution for the driver circuit connecting wiring 9 are both
applied, but such constitutions may be employed independently.
Further, in the present embodiment, a constitution is illustrated
in which at least a part of the group of scan lines connected to
one side of the display region is formed in a region on the
insulating substrate in which the signal line driver circuit is
mounted. However, even if at least a part of the group of signal
lines 8, which connects the signal line driver circuit and the
signal lines of the display region, is formed in a region on the
insulating substrate in which the scan line driver circuit is
mounted so as to make a detour around the group of scan lines 7
that connects the scan line driver circuit and the scan lines of a
side opposite to the one side of the display region, and the
section of the connection between the group of scan lines 7 and the
scan line driver circuit, the display device can be miniaturized in
the same manner as described above.
[0037] Second Embodiment
[0038] The second embodiment of the present invention will now be
described by referring to FIG. 3. FIG. 3 is a planar view of the
liquid crystal display device of the second embodiment of the
present invention. In FIG. 3, the same reference numerals is
assigned to constituent parts which are the same as those in FIGS.
1 and 2, and a description is therefore provided with respect to
the differences. In FIG. 3, 14 denotes crossover points between the
group of scan lines 6 and the group of signal lines 8. In the
present embodiment, unlike the constitution as in the first
embodiment above in which at least a part of the group of scan
lines, which is connected to one side of the display region, is
formed in a region on the insulating substrate in which the signal
line driver circuit is mounted, the group of scan lines 6 and the
group of signal lines 8 are formed so as to intersect at the
crossover points 14 in a region of overlap between the insulating
substrate 1 and the opposing substrate 2. In this case, because the
group of scan lines 6 and the group of signal lines 8 are formed so
as to intersect via an insulation film or the like, for example, a
short circuit between these groups of lines can be prevented.
[0039] As a result of such a constitution, similarly to the first
embodiment, in the case of a liquid crystal display device in which
a scan line driver circuit and a signal line driver circuit are
mounted directly on an insulating substrate close to one side of a
display region, the display device can be miniaturized. Further,
the display device can be miniaturized further by also applying the
constitution of the driver circuit connecting wiring 9 according to
the first embodiment described above to the present embodiment.
Further, in the present embodiment, a constitution is illustrated
in which the group of scan lines 6 and the group of signal lines 8
intersect in a region of overlap between the insulating substrate 1
and the opposing substrate 2. However, a constitution is also
possible in which the group of scan lines 6 and group of signal
lines 8 intersect in a region on the insulating substrate 1 in
which there is no overlap with the opposing substrate 2.
[0040] Third Embodiment
[0041] The third embodiment of the present invention will now be
described by means of FIG. 4. FIG. 4 is a planar view of the liquid
crystal display device according to the third embodiment of the
present invention. In FIG. 4, the same reference numerals are
assigned to constituent parts which are the same as those of FIGS.
1 to 3, and therefore a description will be provided with respect
to the. differences. In FIG. 4, 15 denotes transfer electrodes for
supplying an opposite potential (common potential) to the opposing
substrate, and 16 is common potential supply wiring for supplying
an opposite potential (common potential) to the transfer electrodes
15. As shown in FIG. 4, the present embodiment is such that wiring
such as the group of scan lines 6 and 7 and the group of signal
lines 8 is not present, and hence the transfer electrodes 15, which
supply an opposite potential (common potential) from outside the
liquid crystal panels to the opposing substrate via a driver
circuit are formed with a relatively high degree of freedom in the
vicinity of one side on the insulating substrate opposite to the
one side on which the driver circuits are mounted. In cases where
this common potential must also be inputted to the display region,
the difference in drive capacity, which depends on the distance
from the driver circuit, should be minimized, and it is desirable
that this common potential supply wiring be formed thickly and be
formed on the four sides of the display region so as to surround
the display region.
[0042] As a result of such a constitution, an enlargement of the
display device caused by the formation of the transfer electrodes
can be suppressed and the display device can therefore be
miniaturized. Further, the display device can be miniaturized
further by suitably combining the constitution of the driver
circuit connecting wiring of the above first and second embodiments
or the constitution of the scan-line or group of signal lines with
the present embodiment.
[0043] Fourth Embodiment
[0044] The fourth embodiment of the present invention will be
described by means of FIGS. 5 and 6. FIG. 5 is a planar view of the
liquid crystal display device according to the fourth embodiment of
the present invention, and FIG. 6 is another planar view of the
liquid crystal display device according to the fourth embodiment of
the present invention. In FIGS. 5 and 6, the same reference
numerals are assigned to the constituent elements which are the
same as those in FIGS. 1 to 4, and therefore a description will be
provided with respect to the differences. In FIGS. 5 and 6, 17 is a
flexible substrate (FPC: Flexible Print Circuit) that supplies a
scan line potential from outside the liquid crystal panel; 18 is a
flexible substrate (FPC) that supplies a signal line potential from
outside the liquid crystal panel; 19 are connecting terminals on
the insulating substrate for the FPCs 17 and 18; and 20 are
mounting overlap marks on the insulating substrate for the mounting
of the driver circuits or FPCs.
[0045] As shown in FIG. 5, the present embodiment is constituted so
as to permit further miniaturization of the display device by
mounting the driver circuits 4 and 5 and the FPCs 17 and 18 on an
end of the insulating substrate in the vicinity of one side and a
common alignment mark 20 are shared for mounting the driver
circuits and FPCs. In cases where additional mount precision is
sought for the mounting of the driver circuits or FPCs onto the
insulating substrate, an alignment mark is desirably also provided
in the gap between the driver circuits or FPCs. Due to restrictions
posed by mounted devices or the problem of mount precision, some of
the alignment marks 20 could also be formed in the gap between the
driver circuits which have then been mounted on the insulating
substrate, for example, as shown in FIG. 6.
[0046] In addition to the above-described alignment marks, any kind
of test marks of a display device test process, and so forth, could
also be utilized as the marks 20 according to the present
embodiment. In addition, the display device can be miniaturized
further by suitably combining the constitutions of the driver
circuit connecting wiring according to the above first to third
embodiments or the constitutions of the scan-line or group of
signal lines s, with the present embodiment.
[0047] Fifth Embodiment
[0048] The fifth embodiment of the present invention will now be
described by means of FIGS. 7 to 9. FIG. 7 is a planar view of the
liquid crystal display device according to the fifth embodiment of
the present invention. FIG. 8 is another planar view of the liquid
crystal display device according to the fifth embodiment of the
present invention. FIG. 9 is another planar view of the liquid
crystal display device according to the fifth embodiment of the
present invention. In FIGS. 7 to 9, the same reference numerals are
assigned to the constituent parts which are the same as those in
FIGS. 1 to 6, and a description is therefore provided with respect
to the differences. In FIGS. 7 to 9, 21 is connecting lines that
connects the connecting terminals of the driver circuits and of the
FPCs, while 22 denotes FPC dummy terminals on the insulating
substrate.
[0049] In FIG. 7, s1 to s4 denote the terminal width of each FPC
connecting terminal 19 on the insulating substrate, terminals with
the same reference numerals being terminals that have the same
width, where p1 denotes the mounting pitch of the terminals. In
FIG. 7, the mounting pitch of the FPC connecting terminals 19 on
the insulating substrate is pl. In order to reduce the wiring
resistance, the terminals connected to long lines are afforded a
larger terminal width as well as a larger line width, whereby a
lower resistance is achieved. As a result of such a constitution,
it is possible to minimize the difference in wiring resistance of
the wiring.
[0050] In addition, in FIG. 8, s1 denotes the terminal width of the
FPC connecting terminals 19 on the insulating substrate, while pl
to p4 denote the mounting pitch of each terminal, terminals with
the same reference numerals being terminals that have the same
pitch. In FIG. 8, the terminal width of the FPC connecting
terminals 19 on the insulating substrate is formed as s1. In order
to reduce the wiring resistance, the terminals connected to long
lines are afforded a smaller terminal pitch, whereby a lower
resistance is achieved. As a result of such a constitution, it is
possible to minimize the difference in wiring resistance of the
wiring.
[0051] Further, in FIG. 9, p1 denotes the mounting width of the FPC
connecting terminals 19 on the insulating substrate, while s1
denotes the terminal width. In FIG. 9, by making the terminal width
and terminal pitch of the FPC connecting terminals 19 on the
insulating substrate the same and forming dummy terminals 22 that
are not connected to the scan line driver circuit and the signal
line driver circuit on one side or both sides of the terminals with
a short wiring length, and the like, it is possible to minimize the
difference in wiring resistance of the wiring. Further, by also
forming the dummy terminals 22 on the outermost side of the FPC
connecting terminals 19, these dummy terminals 19 can also be used
as repair terminals for cases where the FPC connecting terminals 19
exhibit problems such as patterning defects or severance, and so
forth.
[0052] As a result of such a constitution, in a liquid crystal
display device in which a scan line driver circuit and a signal
line driver circuit are mounted directly onto an insulating
substrate in the vicinity of one side of a display region, and in
which scan lines for receiving signal inputs from outside and a
signal line potential supply FPC are mounted, the difference in
wiring resistance of the connecting wiring of the connecting
terminals of the driver circuits and the FPCs, which poses a
problem in attempts to miniaturize the display device, can be
minimized, whereby the display quality of the display device can be
improved. Further, the constitution of the present embodiment can
be used for either one of: the connecting wiring between the scan
line driver circuit and the scan line potential supply FPC, and the
connecting wiring between the signal line driver circuit and the
signal line potential supply FPC. Further, by combining the
constitution of the fourth embodiment above with the present
embodiment, the display device can be miniaturized and the display
quality can be improved.
[0053] Sixth Embodiment
[0054] The sixth embodiment of the present invention will now be
described by means of FIGS. 10 and 11. FIG. 10 is a planar view of
the liquid crystal display device according to the sixth embodiment
of the present invention. FIG. 11 is another planar view of the
liquid crystal display device according to the sixth embodiment of
the present invention. In FIGS. 10 and 11, the same reference
numerals have been assigned to constituent parts which are the same
as those in FIGS. 1 to 9, and a description is therefore provided
with respect to the differences. In FIGS. 10 and 11, 23 denotes
wiring that connects the display region and the scan line driver
circuit, while 24 denotes wiring that connects the display region
and the signal line driver circuit.
[0055] In FIG. 10, L1 to L5 denote the line width in the respective
regions of the scan lines 23, and Ml to M5 denote the intervals in
respective regions of the scan lines 23. In FIG. 10, the scan lines
23 are patterned so that the ratio L/M between the line width and
the line interval in the respective regions of the wiring 23 is
equal to a predetermined value (L1/M1=L2/M2=L3/M3=L4/M4=L5/M5=a)
Further, similarly also in FIG. 11, L1 to L3 denote the line width
in respective regions of the signal lines 24, and Ml to M3 denote
the intervals in respective regions of the signal lines 24. The
signal lines 24 are patterned so that the ratio L/M between the
line width and the line interval in the respective regions of the
wiring 24 is equal to a predetermined value (L1/Ml=L2/M2=L3/M3=b) .
Further, in the present embodiment, the wiring 23 that connects the
display region and the scan line driver circuit in FIG. 10 is
connected to only one side of the display region, but, similarly to
the embodiment described above, could also be connected to an
opposite side.
[0056] As a result of such a constitution, in a liquid crystal
display device in which a scan line driver circuit and a signal
line driver circuit are mounted directly onto an insulating
substrate in the vicinity of one side of a display region, problems
with disconnection and. short-circuit can be prevented by applying
a predetermined ratio between the line width and the line interval
which serves to lower the rate of occurrence of disconnection
defects and short-circuit defects to substantially the entire
wiring region. Furthermore, by suitably combining the above first
to fifth embodiments with the present embodiment, the display
device can be miniaturized and severed line defects and
short-circuit defects can also be suppressed, meaning that it is
possible to obtain a display device with a high manufacturing
yield.
[0057] Seventh Embodiment
[0058] The seventh embodiment of the present invention will now be
described by means of FIG. 12. FIG. 12 is an explanatory view of
the liquid crystal display device according to the seventh
embodiment of the present invention. In FIG. 12, the same reference
numerals are assigned to the constituent parts which are the same
as those in FIGS. 1 to 11, and a description is therefore provided
with respect to the differences. In FIG. 12, 25 denotes a liquid
crystal panel formation region, 26 denotes cutting lines, and 27
denotes cutting marks.
[0059] In FIG. 12, after the insulating substrate 1 and the
opposing substrate 2 have been pasted together, cutting marks for
cutting off individual liquid crystal panels, or marks for
confirming the cutting accuracy, or the like, are formed on the
opposing substrate 2. Conventionally, marks 27 have been formed on
the insulating substrate 1 because of ease of pattern formation or
problems with pattern accuracy; however, it has required some
region for the mark formation due to other pattern restrictions,
and the like. The formation of the marks 27 on the opposing
substrate 2 as per the present embodiment permits miniaturization
of the display device and obviates the need for patterning on the
insulating substrate, meaning that fabrication can be performed
easily without the generation of additional steps (for example, an
increase in the short number and an increase in the short size of
the photolithographic process, and so forth) in the process of
fabricating the insulating substrate.
[0060] Further, as a result of suitably combining the constitutions
of the above first to sixth embodiments with the present
embodiment, not only can the display device be further
miniaturized, an increase in the display quality and the
manufacturing yield, and so forth, is also permitted.
[0061] A description has been provided hereinabove in the above
first to seventh embodiments for a liquid crystal display device
that comprises driver circuits for driving the liquid crystal
display device or FPCs for receiving signal inputs from outside.
However, the present invention is not limited to or by such a
liquid crystal display device, and it is obvious that no impediment
is caused even if the present invention is applied to a display
device that uses electroluminescent elements and so forth or indeed
to every kind of display device that comprises driver circuits or
FPCs for receiving signal inputs from outside.
[0062] From the invention thus described, it will be obvious that
the embodiments of the invention may be varied in many ways. Such
variations are not to be regarded as a departure from the spirit
and scope of the invention, and all such modifications as would be
obvious to one skilled in the art are intended for inclusion within
the scope of the following claims.
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