Electronic circuit wiring and display device

Electronic circuit wiring and display device

The present invention relates to an electronic circuit wiring which aims to protect a circuit during electrostatic discharge, etc., and has a main circuit structure that surrounds the internal main circuit at the peripheral edge of the substrate, and has only one part of the electronic circuit wiring open. Display devices such as liquid crystal display device panels.

It is known that a display device such as a liquid crystal display panel has a structure for protecting a circuit from electrostatic discharge and the like (for example, refer to Patent Documents 1 and 2).

For example, in a display panel such as a liquid crystal display panel, in order to protect against noise mixing, malfunction, damage, etc. caused by electrostatic discharge, an open-curve electronic circuit wiring area made of metal is provided on the periphery of the substrate. It has a structure that encloses the internal circuit and has an opening.

FIG. 1 is a diagram schematically showing a wiring part of an open curve electronic circuit configured in a conventional display panel.

As shown in FIG. 1, the display panel 1 has a rectangular effective display (pixel) area 2 formed in the center. At the periphery of the effective display area 2, an open-curved electronic circuit wiring 3 is arranged.

The open-curve electronic circuit wiring 3 has a start terminal A1 and an end terminal B1, and the end terminal B1 is a power terminal or a ground terminal that has a discharge and fruit discharge than the start terminal A1.

These start terminal A1 and end terminal 1 are connected to the flexible connection terminal portion 4 provided at the left edge portion 1a of the display panel 1 in the figure.

In the path of the open-curved electronic circuit wiring 3, a high-resistance element R1 is connected, and a region 5 for crossing several wirings 6 through an insulating layer is provided.

In this crossing region 5, for example, on the lower side of the open-curved electronic circuit wiring 3, pixel drive wirings of the effective display region 2 and the like are laid out with an insulating layer or the like interposed therebetween.

In addition, in the conventional display panel 1, the open-curved electronic circuit wiring 3 is arranged in the order of "start terminal A1crossing area 5high resistance element R1end terminal B1".

[Patent Document 1] Japanese Patent Laid-Open No. 2000-19556 [Patent Document 2] Japanese Patent No. 2965687

As described above, in the conventional display panel 1, since the open-curved electronic circuit wiring 3 is arranged in the order of "start terminal A1crossing area 5high resistance element R1end terminal B1", charges will accumulate On the resistance element R1, the voltage applied to the capacitor portion across the region 5 will be greater than necessary. As a result, a voltage exceeding the withstand voltage of the insulating layer will cause insulation breakdown, and the upper and lower wirings will be short-circuited and defective, and a problem of so-called panel manufacturing yield and reliability will be reduced.

When electrostatic discharge occurs, although it is a very short time, there will be a large inrush current of about 30 amperes in an instant, in the order of "start terminal A1crossing area 5high resistance element R1end terminal B1" Flow through the open-curved electronic circuit wiring 3.

At this time, the charge tends to accumulate on the high-resistance element R1, and the voltage value at this place will be very high instantaneously.

Therefore, the voltage across the upper and lower wirings of the area 5 will rise and exceed the withstand voltage of the insulating layer, and then the insulation will be broken, and the wiring will be disconnected.

Regarding this question, I will explain it in more detail with a diagram.

2A and 2B are diagrams showing the layout patterns in the display panel 1 of FIG. 1 in a simplified manner; FIG. 2A is the main part, and FIG. 2B is the equivalent circuit.

Furthermore, in the equivalent circuit of FIG. 2B, the capacitor PC inserted into the ground with the resistor string represents a dynamic parasitic capacitance that occurs when a high current of electrostatic discharge is injected.

If a surge current caused by electrostatic discharge flows through the open-curved electronic circuit wiring 3 from the start terminal A1 to the end terminal B1, the high-frequency current component contained in the surge current IS will pass through a The parasitic capacitance PC formed on the crossing area 5 flows to the ground GND.

On the other hand, the components with larger energy whose frequency is not that high will flow to the resistance element R1 without consuming the energy, and the potential of the place will rise.

As a result, the capacitor PC formed in the crossover area 5 will exceed the withstand voltage, and the insulating layer between the upper and lower wirings will cause insulation breakdown, so that the upper and lower wirings will cause a short circuit.

In addition, in Japanese Patent Documents 1 and 2, the voltage rise across the upper and lower wirings of the region 5 exceeds the withstand voltage of the insulating layer, which causes insulation breakdown, and the disconnection of wiring and other disadvantages are not considered. .

The object of the present invention is to provide an electronic circuit wiring and a display device with the wiring, and the wiring can reduce a wiring damage caused by electrostatic discharge, improve the yield, and improve the reliability of the display panel.

In order to achieve the above-mentioned object, the first aspect of the present invention is an electronic circuit wiring, which is to protect a main circuit formed on a substrate from static electricity. The layer straddles the crossing area of other wirings; and has a start terminal, an end terminal disposed on the side of the start terminal through the crossing area, and a resistance element, and the resistance element is relative to the crossing area , And is connected to the above-mentioned starting terminal side.

The second aspect of the present invention has an effective display area formed on a substrate and an electronic circuit wiring. In order to protect the effective display area from static electricity, the electronic circuit wiring is configured to surround the effective display area and the wiring contains A part of the electronic circuit wiring has a start terminal, a terminal terminal arranged on the side of the start terminal through the straddle area, and a resistance element through the insulating layer. The resistance element is connected to the above-mentioned starting terminal side with respect to the crossing area.

Preferably, the end terminal is a terminal that has a discharge effect on the start terminal.

Preferably, the terminal terminal is connected to a power line of a specific potential.

Preferably, the terminal terminal is grounded.

According to the present invention, it is set such that, for example, the surge current caused by electrostatic discharge flows from the start terminal to the end terminal and flows through the electronic circuit wiring.

At this time, although a potential rise occurs at the position of the resistance element, a current flows through the resistance element, and a large potential drop occurs at this time. As a result, the potential across the region hardly rises.

In other words, a considerable part of the energy of the surge current will first be consumed on the resistance element, so the large energy will not reach the crossover area.

Therefore, defects such as short circuits between the upper and lower wirings caused by the breakdown of the insulation on the crossing area will not occur.

According to the present invention, there will be advantages in that the damage to the wiring caused by electrostatic discharge is reduced, the yield will be improved, and the reliability will also be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 3 is a diagram schematically showing a panel type display device equipped with an open-curved electronic circuit wiring portion according to the present invention.

The main components of the panel-type display device 10 disclosed in this embodiment include a display panel 11, an effective display (pixel) area 12 as a main circuit, an open-curved electronic circuit wiring 13, a flexible connector terminal portion 14, and a crossover Region 15, across wiring 16, and high resistance element R11.

In the panel-type display device 10 disclosed in this embodiment, the display panel 11 is shown in FIG. 3, and a rectangular effective display (pixel) area 12 is formed in the center; and at the periphery of the effective display area 12, there is a wiring For example, open curve electronic circuit wiring made of aluminum.

The effective display area 12 is arranged in a matrix with a pixel area including a pixel grid (such as a liquid crystal grid) and a thin film transistor (TFT), and supplies scanning signals to a plurality of scanning lines of each TFT, and a display signal is supplied to the pixel grid through the TFT The multiple signal lines are arranged perpendicular to each other.

That is, the panel display device 10 disclosed in this embodiment is configured as an active matrix liquid crystal display device.

The open-curve electronic circuit wiring 13 has a start terminal A11 and an end terminal B11. Compared with the start terminal A11, the end terminal B11 is a power terminal or ground terminal with a discharge effect.

The start terminal A11 and the end terminal B11 are connected to a flexible connector terminal portion 14 arranged at the left edge portion 11a of the display panel 11 in the figure.

In the path of the open-curved electronic circuit wiring 13, a high-resistance element R11 (for example, a resistance value of 1M ohm) is connected, and a crossing area ( In this embodiment, the crossing area 15 is used for illustration).

In the crossing area 15, for example, the pixel driving wiring of the effective display area 12 is laid under the open-curved electronic circuit wiring 13 with an insulating layer interposed therebetween.

FIG. 4 is a schematic cross-sectional view of the crossing area 15 disclosed in this embodiment.

As shown in FIG. 4, the crossing area 15 is formed on the insulating substrate 151 with pixel driving wiring of the effective display area 12 and the crossing wiring 16, and on the crossing wiring 16 and the insulating substrate 151, covering the crossing wiring 16 is formed There is an insulating layer 152.

On the insulating layer 152 and the insulating substrate 151, an interlayer insulating layer 154 including a barrier layer 153 is formed.

Next, on the interlayer insulating layer 154, an open-curved electronic circuit wiring 13 is formed that overlaps the cross wiring 16 in a partial area with the insulating layer 152 and the interlayer insulating layer 154 interposed therebetween.

Next, in the panel display device 10 disclosed in this embodiment, the open-curved electronic circuit wiring 13 is arranged in the order of "start terminal A11high resistance element R11crossing area 15end terminal B11".

That is, in this embodiment, the resistance element R11 is arranged on the side of the start terminal A11 with respect to the straddle area 15.

In other words, regarding the arrangement positions of the resistance element R11 and the crossing area 15 between the start terminal A11 and the end terminal B11 of the open curve electronic circuit wiring 13, it is considered that the resistance element R11 is arranged close to the start terminal A11, and then Just cross area 15.

In this case, the inrush current IS11 caused by electrostatic discharge will flow through the open-curved electronic circuit wiring 13 in the order of "start point A11high resistance element R11crossing area 15end point B11".

In this case, the electric charge will accumulate in the resistance element R11. Although the voltage there is instantaneously increased, the rise of the voltage between the wirings across the region 15 is reduced, that is, it is difficult to produce a broken wire due to insulation breakdown.

In the following, it is difficult to produce a reason for defective wire breakage due to insulation failure, which is explained in more detail with a diagram.

5A and 5B are diagrams showing the layout patterns in the display panel 11 of FIG. 3 in a simplified manner. Figure 5A is its main part, and Figure 5B is its equivalent circuit.

In addition, in the equivalent circuit of FIG. 5B, the capacitor PC11 inserted in series with the resistor is a dynamic parasitic capacitance that occurs when high current is injected due to electrostatic discharge.

Now, as shown in FIGS. 5A and 5B, a surge current IS11 caused by electrostatic discharge flows through the open-curved electronic circuit wiring 13 from the start terminal A11 to the end terminal B11.

At this time, although the phenomenon of potential rise occurs where the resistance element R11 is located, a large potential drop occurs when the current passes through the resistance element R11. As a result, the potential across the region 15 does not rise.

In other words, since a considerable part of the energy of the inrush current IS11 is first consumed by the resistance element R11, there will be no considerable energy in the crossing area 15.

Therefore, it is difficult to cause a short circuit between the upper and lower wirings caused by the insulation breakdown on the crossing area 5 as shown in FIG. 1.

As described above, according to the present embodiment, there is an effective display area 12 formed on the substrate, and an effective display area 12 for protecting the effective display area 12 from static electricity, and wiring around the effective display area 12, and wiring The electronic circuit wiring includes a part of the electronic circuit wiring that crosses over with other wirings through an insulating layer; and the electronic circuit wiring 13 has a start terminal A11, and a part of the electronic circuit wiring is arranged on the side of the start terminal A11 through the crossing area. Since the end terminal B11, the resistance element R11, and the resistance element R11 are connected to the start terminal A11 side with respect to the crossing area, it is difficult to cause a short circuit between the upper and lower wirings caused by the insulation breakdown of the crossing area.

Therefore, there are advantages in that the damage to the wiring caused by electrostatic discharge is reduced, the yield is improved, and the reliability of the display panel is improved.

In addition, although this embodiment uses a liquid crystal display panel for description, the present invention can also be applied to other panel type display devices, such as organic electroluminescent (EL) display devices.

[Industrial Utilization Possibility]

The present invention can reduce the damage of wiring caused by electrostatic discharge, increase the yield, and improve the reliability of the display panel, so it is suitable for liquid crystal display panels or other panel type display devices.

<p>10Panel display device</p><p>11Display Panel</p><p>12Effective display (pixel) area</p><p>13Open curve electronic circuit wiring</p><p>14Flexible connector terminal part</p><p>15Across the area</p><p>16Across the wiring</p><p>151Insulating substrate</p><p>152Insulation layer</p><p>153Barrier</p><p>154Interlayer insulation</p><p>A11Start terminal</p><p>B11Terminal terminal</p><p>IS11Surge current</p><p>R11High resistance element</p>

FIG. 1 is a diagram illustrating a conventional panel type display device equipped with open-curved electronic circuit wiring.

FIGS. 2A and 2B are diagrams simplistically showing the layout patterns in the display panel of FIG. 1, FIG. 2A is a schematic diagram of the main parts, and FIG. 2B is an equivalent circuit diagram.

FIG. 3 is a diagram schematically showing a panel type display device equipped with an open-curved electronic circuit wiring portion according to the present invention.

Fig. 4 is a schematic cross-sectional view of the crossing area disclosed in this embodiment.

5A and 5B are diagrams that simply show the layout patterns in the display panel of FIG. 3, FIG. 5A is a diagram of the main parts, and FIG. 5B is an equivalent circuit diagram.