JPH112839A - Active matrix liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the active matrix liquid crystal display device which can actualize short-circuit inspection between signal lines through a short bar and is equipped with electrostatic protecting circuit constitution capable of preventing problems of dielectric breakdown caused at an intersection part between the common line and a signal line of an electrostatic protecting circuit. SOLUTION: Short bars SHde and SHdo of electrostatic protecting circuits of electrically independent even-numbered signal lines (group) D2j and odd- numbered signal lines (group) D2j-1 are coupled by a coupling element part CONEL consisting of a nonlinear element or high-resistance element and thus placed in an electrically connected state from a floating state. Consequently, both the even-numbered and odd-numbered electrostatic protecting circuit systems are held at the same potential and the intersection parts between the signal lines and common line are held at the same potential to prevent dielectric breakdown.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active matrix type liquid crystal display device, and more particularly, to an active matrix type liquid crystal display device having an electrostatic protection circuit formed on an active element substrate having a switching element to protect the active element from static electricity. The present invention relates to an active matrix type liquid crystal display device.

[0002]

2. Description of the Related Art Liquid crystal displays are widely used as devices for displaying various images including still images and moving images.

In a liquid crystal display device, a liquid crystal layer is sandwiched between two substrates, at least one of which is made of transparent glass or the like, and a voltage is selectively applied to various electrodes for pixel formation formed on the substrate. Is applied to turn on and off a predetermined pixel, the above-described various electrodes and a thin film transistor (T
An active element including a switching element such as FT) is formed, and by selecting this active element, a predetermined pixel is turned on and off.

[0004] In particular, the latter type of liquid crystal display device is called an active matrix type, and has become the mainstream of the liquid crystal display device because of its contrast performance, high-speed display performance and the like.

An active matrix type liquid crystal display device is
A liquid crystal panel having liquid crystal interposed between a color filter substrate and an active element substrate on which display pixel electrodes and switching elements are formed, and an electric circuit unit, an optical circuit unit,
Others are formed.

A conventional active matrix type liquid crystal display device employs a so-called vertical electric field method in which an electric field for changing the orientation of a liquid crystal layer is applied between an electrode formed on one substrate and an electrode formed on the other substrate. Was adopted.

In recent years, a so-called in-plane switching (IPS) liquid crystal display device has been realized in which the direction of an electric field applied to a liquid crystal layer is substantially parallel to the substrate surface. As this in-plane switching type liquid crystal display device, a device in which a very wide viewing angle is obtained by using a comb electrode on one of two substrates is known (Japanese Patent Publication No. 63-21907, US Patent No. 43
No. 45249).

A protection circuit for protecting the switching element from static electricity is formed on the active element substrate.

FIG. 12 is a plan view of the structure of a conventional active element substrate viewed from a direction perpendicular to the substrate. FIG. 13 is a sectional view of one pixel in FIG. In the following description, a plurality of various signal lines such as a video signal line and a scanning signal line formed on an active element substrate are simply described as “signal lines”. Also means.

In FIG. 12, Gi is a scanning signal line, Dj
Denotes a video signal line. The even-numbered video signal lines are D
2j, the odd-numbered video signal line may be indicated by D2j-1. A switching element (generally a TFT), which is an active element, not shown, is provided near these wiring intersections.

As shown in the sectional view of FIG. 13, the TFT includes a metal layer GM (gate Gd) of a scanning signal line layer, a gate insulating film Gin, a semiconductor layer aSi, and a metal of a video signal line layer formed on a substrate SUB. It is composed of a layer DM and a protective film PAS.

An output electrode of the switching element is connected to a pixel electrode for applying an electric field to the liquid crystal, and a two-dimensionally arranged display pixel (i, j) (i, j =
1, 2, 3,...). DPAD outside the display area is a terminal (D-line external connection terminal) for externally connecting a driving electric circuit to the video signal line. DDPAD provided on the opposite side is a probe terminal (disconnection inspection terminal) for disconnection inspection and the like. Similarly, GPAD is a terminal (G line external connection terminal) for externally connecting a driving electric circuit to the scanning signal line.

Further, CTLN indicates a cutting line of the substrate SUB, and is finally cut along this line.
Short bars SHde and S described later outside the TLN
Hdo and the like are cut off.

Display area and connection terminal DPA for video signal line
D, odd-numbered common line Com (e) and even-numbered common line Com provided between connection terminals GPAD for scanning signal lines
(O), the scanning common line COM-G and the discharge element DIO form a first electrostatic protection circuit.

DIO is a video signal line Dj or a scanning signal line Gi.
A discharge element (non-linear element: switching element) for discharging static electricity that has entered, and an odd-numbered (EVEN side) common line Com (e) for each of the scanning signal line Gi and the video signal line Dj;
Even side (ODD side) common line Com (o), scanning common line C
OM-G.

These common lines Com (e), Com
(O), COM-G is a common line for absorbing discharged static electricity, and is connected to the common connection terminal VcomPAD and the discharge element common connection terminal ESDPAD, and through this, the common electrode on the color filter substrate side and external electric Connected to the circuit. A non-linear element such as a bidirectional diode is often used as the discharging element DIO.

The discharge element DIO is introduced at:
It is not limited to the portion shown in the figure, and may be provided on the opposite side or both sides of the terminals GPAD and DPAD of the scanning signal line Gi and the video signal line Dj, or may be provided on the opposite side alternately.

Further, a second electrostatic protection circuit is provided. In FIG. 12, the odd-numbered and even-numbered short bars SHde and SH outside the substrate cutting line CTLN are shown.
do or SHg is an example of an element constituting the second electrostatic protection circuit.

These short bars SHde, SHd
Symbols o and SHg are wires provided on the outer peripheral portion, and are wires for absorbing static electricity. This short bar SHde,
Terminals of the signal lines Gi and Dj are electrically coupled to SHdo and SHg.

This terminal and the short bars SHde, SHd
The positions of connection with o and SHg are not limited to the case shown in the figure. When the connection is made between the connection terminals GPAD and DPAD of the scanning signal line Gi and the video signal line Dj, when the connection is made on the opposite side, , Or alternately on the opposite side.

FIG. 14 is a plan view for explaining the structure of the display pixel portion, and FIG. 15 is a sectional view taken along the line bb 'of FIG. 14, where Gi is a scanning signal line and Dj is a video signal line. Gd extending a part of the scanning signal line Gi is a gate electrode of the switching element (TFT), and Dd extending a part of the video signal line Dj is a signal electrode (drain electrode) of the switching element. is there. Sd in the same layer as the signal electrode Dd is an output electrode (source electrode) and is connected to the transparent pixel electrode ITO that applies an electric field to the liquid crystal.

ASi is a semiconductor layer of the switching element, C
“st” is a storage capacitance unit, and is provided for each pixel (i, j).

In FIG. 14 and FIG. 15, first, a scanning signal line GM as a first metal layer is formed on a substrate (glass substrate) SUB.
(Gd) is formed. After laminating a gate insulating film Gin such as SiNx thereon, a semiconductor layer aSi is formed, and further thereon a video signal line layer DM (Dd, Sd) of a second metal layer is formed.
Is formed.

Then, a protective film PA such as SiNx is formed thereon.
S is formed, and finally, a transparent pixel electrode layer ITO is formed.
The connection between the output electrode Sd and the transparent pixel electrode ITO is formed by the protective film PA.
This is performed through the through hole Th of S.

The processing of the gate insulating film Gin is performed by the protective film PA.
The configuration is such that it can be formed simultaneously at the same time when the S through hole Th is processed.

In the configuration of the active element substrate illustrated in FIGS. 12 to 15, the electrostatic protection circuit according to the present invention has the following configuration.

In the first electrostatic protection circuit configuration,
As shown in FIG. 12, the non-linear elements DIO of the respective video signal lines Dj are alternately provided on the opposite side and have a vertically separated configuration, each of which has a common line Com (e), Com (o).
Is joined to.

That is, an even-numbered line (an even-numbered video signal line is expressed as 2j) D2j and an odd-numbered line (an odd-numbered video signal line is expressed as 2j-1) D2j-1 are divided into upper and lower lines. Independent configuration. Further, in the second electrostatic protection circuit configuration, the coupling of each video signal line Dj with the short bar is similarly illustrated in FIG. 12, even-numbered video signal lines D2j and odd-numbered video signal lines D2j.
-1 is divided into upper and lower parts, short bar SHde and SHd
It has an independent configuration that is coupled to each of o.

With such a configuration, in various inspections performed after the completion of the active element substrate, for example, a short inspection between video signal lines adjacent to each other is performed by applying probe needles to upper and lower short bars SHde and SHdo. By performing a short-circuit inspection during that time, it can be easily realized.

The case of the video signal line Dj has been described above, but the same applies to the scanning signal line Gi.

[0031]

However, the above-described structure of the electrostatic protection circuit has the following problems.

FIG. 16 is a schematic diagram showing an example of the configuration of the static electricity protection circuit for the video signal line Dj in FIG. 12, and the same reference numerals as in FIG. 12 indicate the same parts.

In the figure, even-numbered signal lines D2j
Is coupled to an even-numbered common line Com (e) for an even-numbered video signal line via a nonlinear element DIO formed of a bidirectional protection diode, and the signal line is terminated outside the external terminal side DPAD. Is connected to the even-numbered short bar SHde for the even-numbered signal line.

The odd-numbered signal line D2j-1 is coupled to the lower odd-numbered side common line Com (o) for the odd-numbered video signal line via the non-linear element DIO. It is coupled to an odd-numbered short bar SHdo for odd-numbered video signal lines outside the inspection terminal DDPAD.

As described above, the even-numbered signal line group and the odd-numbered signal line group are electrically independent. For this reason, the short-circuit inspection between adjacent wirings can be simply and collectively realized through the two short bars SHde and SHdo.

In such a configuration, a portion indicated by a mark in the drawing, that is, an intersection between an even-numbered common line Com (e) at a floating potential and an odd-numbered video signal line Dj, or conversely, an odd number Electrostatic breakdown occurs at the intersection between the third-side common line Com (o) and the even-numbered video signal line Dj, and a portion that should be insulated is in a dielectric breakdown state, and eventually a line display failure occurs. Problem has occurred.

Accordingly, an object of the present invention is to enable a short test between signal lines to be easily realized through the short bars SHde and SHdo, and to prevent an insulation breakdown occurring at an intersection of a common line and a signal line of an electrostatic protection circuit. An object of the present invention is to provide an active matrix type liquid crystal display device having an electrostatic protection circuit configuration capable of preventing a problem.

[0038]

In order to achieve the above object, the present invention provides an even-numbered signal line (group) and an odd-numbered signal line formed on an active element substrate constituting an active matrix type liquid crystal display device. It is characterized in that the (group) electrostatic protection circuit systems are connected by a non-linear element or a high resistance element.

That is, the present invention has the following configuration.

(1) A liquid crystal is sealed between a pair of substrates consisting of an active element substrate having at least a switching element for selecting a display pixel and an electrode group constituting a display pixel, and a color filter substrate having at least a color filter. In an active matrix type liquid crystal display device comprising a liquid crystal panel stopped, an active element substrate constituting the liquid crystal display panel includes a short bar terminating a signal line and a common line coupled to the signal line via a non-linear element. The short bar and the common line are electrically connected, and the short bar or the common line is connected by a non-linear element or a high resistance element.

(2) The short bar in (1) is divided into a short bar for an even-numbered signal line and a common line, and a short bar for an odd-numbered signal line and a common line. And the common line was electrically connected, and the odd-numbered signal line short bar was electrically connected to the common line.

(3) The short bar in (1) is divided into a short bar for even-numbered signal lines and a common line, and a short bar for odd-numbered signal lines and a common line. A non-linear element or a high-resistance element is connected between the first and second odd-numbered short bars or between the even-numbered signal line common line and the odd-numbered signal line common line.

(4) The configuration of the short bar in (2) or (3) is applied to a video signal line.

(5) The configuration of the short bar in (2) or (3) is applied to a scanning signal line.

(6) A pixel transparent electrode is provided on the protective film of the active element substrate in (1), (2), (3), (4) or (5), and processing of the gate insulating film is performed by processing of the protective film. And after lump formation.

With these configurations, the short bar SH can be tested for short-circuiting between signal lines formed on the active element substrate.
It can be easily realized through de and SHdo, and can prevent dielectric breakdown occurring at the intersection of the common line and the signal line of the electrostatic protection circuit.

[0047]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 16, a problematic point causing insulation breakdown is the intersection of an even-numbered signal line (group) common line Com (e) and an odd-numbered signal line D2j-1. , Or conversely, the odd-numbered signal line (group) common line Com
It is at the intersection of (o) and the even-numbered signal line D2j. As described above, the short bar S
In order to easily realize between Hde and SHdo, the configuration of the electrostatic protection circuit is such that even-numbered signal lines (group)
And odd-numbered signal lines (groups) are electrically independent. Therefore, both are electrically floating with each other when the active element substrate is used alone. Note that, after the color filter substrate is bonded to the active element substrate, the common lines Com (e), Co
Since the common line is connected to the common electrode on the color filter substrate via the VcomPAD connected to m (o), the common line can be maintained at the same potential from the floating state. The electrostatic protection circuits of the line (group) and the odd-numbered signal line (group) are maintained at the same potential.

Since the active element substrates are electrically floating with each other in a single state, if static electricity accumulates between them, a charged potential difference is generated at the intersection of the problem areas. If this potential difference is equal to or higher than the dielectric breakdown voltage at the intersection, dielectric breakdown occurs, resulting in failure.
The above is the cause of the problem.

Therefore, the present invention eliminates this cause,
An electrostatic protection circuit was constructed in such a manner that both did not float in the stage of the active element substrate.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic diagram showing a configuration of a first embodiment of an electrostatic protection circuit for an active matrix type liquid crystal display device according to the present invention. The configuration of the electrostatic protection circuit in the case of a video signal line Dj as in FIG. An example is extracted and shown, and the same reference numerals as those in FIG. 16 correspond to the same parts.

In this embodiment, in order to avoid both the even-numbered signal lines (group) and the odd-numbered signal lines (group) from the conventional floating state, the configuration of FIG. Is connected to the even-numbered short bar SHde and the odd-numbered common line Com (e) by a coupling line SHVcomPAD.

Similarly, the odd-numbered short bar SHdo and the common line Com (o) on the lower side in the figure are also connected to the coupling line SHVc.
omPAD, and the upper and lower even-numbered short bars SHde and odd-numbered short bars SHdo were electrically connected to each other.

The electrical connection is made by the connection line SHeoCon.
And through the coupling element CONEL. This coupling element CO
The NEL includes a non-linear element or a high-resistance element as described later.

With the configuration of this embodiment, the even-numbered short bar SHde and the odd-numbered short bar SHdo are electrically connected to each other from the floating state (the same potential). As a result, even if static electricity accumulates between both the even-numbered signal lines (group) and the odd-numbered signal lines (group), the static electricity is discharged through the above-described electrical coupling portion. , The electrostatic protection circuits of the even-numbered signal lines (group) and the odd-numbered signal lines (group) are maintained at the same potential, and the intersection of the common line and the signal line, which has caused a problem of dielectric breakdown, has the same potential. , No charge potential difference occurs,
The cause of the dielectric breakdown can be eliminated.

With respect to the short-circuit inspection between adjacent signal lines,
By forming the coupling element CONEL with a non-linear element or a high-resistance element as described later, a simple collective short-circuit test between the upper and lower short bars SHde and SHdo can be performed.

FIG. 2 is a schematic diagram showing the configuration of a second embodiment of the static electricity protection circuit for an active matrix type liquid crystal display device according to the present invention. Like the embodiment of FIG. 1, the static electricity protection circuit for the video signal line Dj is used. A configuration example of the protection circuit is extracted and shown, and the same reference numerals as those in FIG. 1 correspond to the same parts.

In this embodiment, in order to avoid both the even-numbered signal lines (group) and the odd-numbered signal lines (group) from the conventional floating state, the even-numbered short bar on the upper side in FIG. SHde and even-side common line Com
(E) is connected by a coupling line SHVcomPAD, and the odd-numbered short bar SHdo on the lower side and the common line Com are similarly connected.
(O) is also connected by the coupling line SHVcomPAD, and the upper and lower even-numbered common lines Com (e) and odd-numbered common lines Com
(O) were electrically coupled to each other.

This electrical connection is made by the connection line SHeoCon.
And through the coupling element part CONEL. Coupling element part CO
The NEL includes a non-linear element or a high-resistance element REMT as described later. As a result, Com (e) and Com (o) are electrically connected to each other from the floating state.

According to the structure of this embodiment, even if static electricity is accumulated between both the even-numbered signal lines (group) and the odd-numbered signal lines (group), the static electricity is discharged through this joint. In other words, the electrostatic protection circuit systems of the even-numbered signal lines (group) and the odd-numbered signal lines (group) are maintained at the same potential, and the intersection of the common line and the signal line, which has been a problem point of causing dielectric breakdown, is also at the same potential. Thus, no charge potential difference occurs, and the cause of the dielectric breakdown can be eliminated.

Regarding the short-circuit test between adjacent signal lines,
By forming the coupling element part CONEL with a non-linear element or a high-resistance element REMT as described later, as in the first embodiment shown in FIG.
And SHdo can be performed by a simple batch short inspection.

FIG. 3 is a schematic diagram illustrating a specific example of a coupling line and a coupling element for coupling an upper and lower short bar or a common line, FIG. 4 is an equivalent circuit diagram of the coupling, and FIG. 5 is another equivalent circuit of the coupling. FIG.

As shown in FIG. 3, the upper and lower short bars S
Hde, SHdo or common line Com (e), Com
(O) connecting line SHeoCon and connecting element section C
The ONEL has a coupling portion constituted by a coupling element section CONEL introduced between the short bars SHde and SHdo or between the common lines Com (e) and Com (o) and a coupling line SHeoCon connected at the connection ends 10a and 10b.

The coupling element REMT of the coupling element unit CONEL
Is a non-linear element or a high-resistance element that limits leak current, guarantees the above-described simple batch short-circuit test, and discharges static electricity to suppress the generation of a potential.

FIG. 4A shows a case where nonlinear elements DI01 and DI02 using a diode-connected transistor are connected in a complementary manner, and FIG. 4B shows a case where nonlinear elements DI01 and DI02 using a diode are connected in a complementary manner. 5 is an equivalent circuit example of the coupling element unit CONEL.

FIG. 5 is an example of an equivalent circuit of a coupling element section CONEL having a coupling element REMT using a high resistance element RGT.

A plurality of such nonlinear elements DIO and high-resistance elements RGT are introduced in parallel as needed.

The GDC1 and GD shown in FIGS.
C2, GD1, GD2, Dd1, Dd2, Sd1, Sd
2, SDa and SDb correspond to the same reference numerals in FIGS. 6 to 9 described later.

FIG. 6 is a plan view of the coupling element shown in FIG. 4A, and FIG. 7 is a sectional view taken along the line dd 'in FIG.

FIG. 8 is a plan view of the coupling element shown in FIG. 5, and FIG. 9 is a sectional view taken along line ee 'of FIG.

In the bidirectional diode configuration shown in FIGS. 6 and 7, gate electrodes GD1, GD2 and output electrode D
The electrical connections GDC1 and GDC2 of d1 and Dd2 are shown in FIG.
2, the through holes Th11 and Th12 and the through holes Th21 and Th22 just like the configuration described in FIGS.
And is connected to the transparent electrode ITO via the

In the structure using the high-resistance element RGT shown in FIGS. 8 and 9, the high-resistance element RGT is formed by connecting the semiconductor layer aSi to the second metal layers Sda and Sdb which are part of the connection ends 10a and 10b. It is realized with a bridged structure.

With these configurations, the short bar SH can be inspected between the signal lines formed on the active element substrate.
It can be easily realized via de and SHdo, and also prevents dielectric breakdown occurring at the intersection of the common line and the signal line of the electrostatic protection circuit.

In each of the above embodiments, the video signal line Dj
However, the present invention is not limited to this, and can be applied to the scanning signal line Gi in the same manner.

In each of the above embodiments, the so-called ITO top structure in which the transparent electrode is formed on the protective film PAS,
Although the structure in which the processing of the gate insulating film Gin can be performed simultaneously with the processing of the PAS film has been described, the present invention is not limited to this, and the same applies to other substrate configurations. Applicable.

FIG. 10 is an exploded perspective view for explaining the entire structure of the active matrix type liquid crystal display device according to the present invention.

FIG. 11 shows a liquid crystal display device (hereinafter, referred to as a liquid crystal display device) according to the present invention.
The liquid crystal display panel, the circuit board, the backlight, and a module in which other components are integrated: this is referred to as MDL).

SHD is a shield case (also called a metal frame) made of a metal plate, WD is a display window, INS1
To 3 are insulating sheets, PCB1 to 3 are circuit boards (PCB1
Is a drain side circuit board: a video signal line driving circuit board, P
CB2 is a gate side circuit board, PCB3 is an interface circuit board), JN1 to 3 are joiners for electrically connecting the circuit boards PCB1 to 3, TCP1 and TCP2 are tape carrier packages, PNL is a liquid crystal display panel, G
C is a rubber cushion, ILS is a light shielding spacer, PRS is a prism sheet, SPS is a diffusion sheet, GLB is a light guide plate, RFS is a reflection sheet, MCA is a lower case (mold frame) formed by integral molding, MO is MC
A opening, LP is fluorescent tube, LPC is lamp cable, G
B denotes a rubber bush supporting the fluorescent tube LP, BAT denotes a double-sided adhesive tape, BL denotes a backlight made of a fluorescent tube, a light guide plate, and the like, and a liquid crystal display module MDL is assembled by stacking diffusion plate members in the arrangement shown in the figure. .

The liquid crystal display module MDL has two kinds of storage / holding members of a lower case MCA and a shield case SHD, and includes insulating sheets INS1 to INS3 and circuit boards PCB1 to PCB1.
3. A metal shield case SHD in which the liquid crystal display panel PNL is housed and fixed, and a lower case MCA in which a backlight BL including a fluorescent tube LP, a light guide plate GLB, a prism sheet PRS, and the like are housed are combined.

An integrated circuit chip for driving each pixel of the liquid crystal display panel PNL is mounted on the video signal line driving circuit board PCB1.
The B3 includes an integrated circuit chip that receives a video signal from an external host, receives a control signal such as a timing signal, and a timing converter TCON that processes a timing to generate a clock signal.

The clock signal generated by the timing converter is integrated on the video signal line driving circuit board PCB1 via the clock signal line CLL laid on the interface circuit board PCB3 and the video signal line driving circuit board PCB1. Supplied to the circuit chip.

The interface circuit board PCB3 and the video signal line driving circuit board PCB1 are multilayer wiring boards, and the clock signal line CLL is connected to the interface circuit board PCB3 and the video signal line driving circuit board PC
It is formed as an inner wiring of B1.

The liquid crystal display panel PNL has a drain-side circuit board PCB1, a gate-side circuit board PCB2 and an interface circuit board PC for driving TFTs.
B3 is connected by tape carrier packages TCP1 and TCP2, and the circuit boards are connected by joiners JN1, JN2, JN3.

The liquid crystal display panel PNL is the active matrix type liquid crystal panel according to the present invention described above, and the structure for preventing dielectric breakdown of the active element substrate is as described in the above embodiment.

FIG. 11 is an external view of a personal computer for explaining an example of an information processing apparatus in which the liquid crystal display device according to the present invention is mounted.
Is an inverter power supply for driving the fluorescent tube, and CPU is a central processing unit on the host side.

As shown in the figure, a personal computer on which the liquid crystal display device according to the present invention is mounted is a video signal line driving circuit board (horizontal driving circuit board: drain side circuit board) PC
By arranging B1 only at the upper part of the screen, a space below the display unit (keyboard side) can be given a margin, and the installation space (hinge space) of the hinge connecting the keyboard unit and the display unit can be reduced. Therefore, the outer size of the display unit can be reduced, and the size of the entire personal computer can be reduced.

[0086]

As described above, according to the present invention,
Short-circuit inspection between adjacent signal lines formed on the active element substrate that constitutes the active matrix type liquid crystal display device can be easily and collectively realized through a short bar, and at the intersection of the common line of the electrostatic protection circuit and the signal line. It is possible to prevent dielectric breakdown due to generation of a potential difference.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of a first embodiment of an electrostatic protection circuit for an active matrix type liquid crystal display device according to the present invention.

FIG. 2 is a schematic diagram showing a configuration of a second embodiment of an electrostatic protection circuit for an active matrix type liquid crystal display device according to the present invention.

FIG. 3 is a schematic diagram illustrating a specific example of a coupling line for coupling an upper and lower short bar or a common line and a coupling element unit.

FIG. 4 is an equivalent circuit diagram of a coupling unit in FIG.

FIG. 5 is another equivalent circuit diagram of the coupling unit in FIG. 3;

FIG. 6 is a plan configuration diagram of the coupling element unit shown in FIG.

FIG. 7 is a sectional view taken along line d-d 'of FIG.

FIG. 8 is a plan view showing a configuration of a coupling element unit shown in FIG. 5;

FIG. 9 is a sectional view taken along the line e-e ′ of FIG. 8;

FIG. 10 is an exploded perspective view illustrating an overall configuration of an active matrix liquid crystal display device according to the present invention.

FIG. 11 is an external view of a personal computer illustrating an example of an information processing device equipped with a liquid crystal display device according to the present invention.

FIG. 12 is a plan view illustrating a configuration of a conventional active element substrate viewed from a direction perpendicular to the substrate.

13 is a cross-sectional view around one pixel in FIG.

FIG. 14 is a plan view illustrating a configuration of a display pixel portion.

FIG. 15 is a sectional view taken along the line b-b ′ of FIG.

16 is a schematic diagram illustrating a configuration example of an electrostatic protection circuit for the video signal line Dj in FIG. 12;

[Explanation of symbols]

 Gi Scan signal line Dj Video signal line SHde Short bar for even-numbered signal line SHdo Short bar for odd-numbered signal line Com (e) Common line for even-numbered signal line Com (o) Common line for odd-numbered signal line SHVcomPAD Short bar Coupling line of common line SHeoCon Coupling line between short bars or common lines CONEL Coupling element section between short bars or common lines REMT Coupling element.

Claims (6)

[Claims] 1. A liquid crystal is sealed between a pair of substrates including an electrode group forming a display pixel, an active element substrate having at least a switching element for selecting the display pixel, and a color filter substrate having at least a color filter. An active matrix liquid crystal display device comprising a liquid crystal panel comprising: an active element substrate constituting the liquid crystal display panel;
A short bar for terminating the signal line and a common line coupled to the signal line via a non-linear element are provided, and the short bar and the common line are electrically coupled to each other to connect the non-linear element or high line between the short bar or the common line. Active matrix type liquid crystal display device characterized by being connected by a resistance element 2. A short bar for an even-numbered signal line and a common line, and a short bar for an even-numbered signal line and a common line. 2. The active matrix liquid crystal display device according to claim 1, wherein lines are electrically connected, and the odd-numbered signal line short bar and a common line are electrically connected. 3. A short bar for an even-numbered signal line and a common line, and a short bar for an even-numbered signal line and a common line. 2. The structure according to claim 1, further comprising a configuration in which a non-linear element or a high-resistance element is connected between the common line for bars or between the common line for even-numbered signal lines and the common line for odd-numbered signal lines. 3. Active matrix type liquid crystal display device. 4. The active matrix type liquid crystal display device according to claim 2, wherein the configuration of said short bar is applied to a video signal line. 5. The active matrix type liquid crystal display device according to claim 2, wherein the configuration of said short bar is applied to a scanning signal line. 6. A gate insulating film having a pixel transparent electrode on a protective film of the active element substrate, and a gate insulating film formed in a lump after the processing of the protective film. Item 6. The active matrix liquid crystal display device according to item 1, 2, 3, 4, or 5.