JP7512449B2 - Display device and wiring board - Google Patents

Description

The present invention relates to a display device and a wiring board.

Some display devices use flexible circuit boards to connect to a host device. Techniques for providing a shielding layer have been proposed as a measure against noise in flexible circuit boards (for example, JP 2009-130198 A and JP 2010-154492 A).

JP 2009-130198 A JP 2010-154492 A

The objective of the present invention is to provide a technology that can reduce noise generated from flexible circuit boards.

Other objects and novel features will become apparent from the description of this specification and the accompanying drawings.

The following is a brief overview of the most representative aspects of the present invention.

That is, the display device includes a display panel and a first flexible circuit board connected to the display panel. The first flexible circuit board includes a plurality of first wirings to which differential signals are input, a plurality of second wirings to which data signals are input, a first ground potential wiring, a second ground potential wiring, a first shield wiring connected to the first ground potential wiring, and a second shield wiring connected to the second ground potential wiring. The plurality of first wirings are covered with the first shield wiring, and the plurality of second wirings are covered with the second shield wiring.

The display device also includes a display panel and a first flexible circuit board connected to the display panel. The first flexible circuit board includes a plurality of first wirings to which AC signals are input, a plurality of second wirings to which data signals are input, a first reference potential wiring, a second reference potential wiring, a first shield wiring connected to the first reference potential wiring, and a second shield wiring connected to the second reference potential wiring. The plurality of first wirings are covered with the first shield wiring, and the plurality of second wirings are covered with the second shield wiring.

The wiring board also includes a plurality of first wirings to which AC signals are input, a plurality of second wirings to which data signals are input, a first reference potential wiring to which a first reference potential is supplied, a second reference potential wiring to which a second reference potential is supplied, a first shield wiring connected to the first reference potential wiring, and a second shield wiring connected to the second reference potential wiring. The plurality of first wirings are covered with the first shield wiring, and the plurality of second wirings are covered with the second shield wiring.

1 is a plan view showing the appearance of a display device according to an embodiment of the present invention; 2 is a diagram showing a basic configuration of a pixel PX and an equivalent circuit of a display device. FIG. 1A and 1B are diagrams illustrating an example of a wiring configuration of a flexible printed circuit board. FIG. 2 is a diagram showing the wiring of a flexible printed circuit board that connects between each external terminal for output of a host device and each external terminal for input of a printed circuit board. FIG. 2 is a plan view illustrating the configuration of each wire of the flexible printed circuit board. 6 is a schematic cross-sectional view of the flexible printed circuit board taken along line AA in FIG. 5. 6 is a schematic cross-sectional view of the flexible printed circuit board taken along line BB in FIG. 5. FIG. 1 is a schematic cross-sectional view of a flexible printed circuit board according to a comparative example. FIG. 1 is a schematic cross-sectional view of a flexible printed circuit board according to a comparative example.

Each embodiment of the present invention will be described below with reference to the drawings.

Note that the disclosure is merely an example, and appropriate modifications that a person skilled in the art can easily conceive of while maintaining the gist of the invention are naturally included within the scope of the present invention. In addition, in order to make the explanation clearer, the drawings may show the width, thickness, shape, etc. of each part diagrammatically compared to the actual embodiment, but these are merely examples and do not limit the interpretation of the present invention. In this specification and each figure, elements similar to those described above with respect to the previous figures are given the same reference numerals, and detailed explanations may be omitted as appropriate.

In this embodiment, a liquid crystal display device is disclosed as an example of a display device. This liquid crystal display device can be used in various devices such as smartphones, tablet terminals, mobile phone terminals, personal computers, television receivers, in-vehicle devices, and game consoles.

In this specification and claims, the terms "upper" and "lower" used in describing the drawings express the relative positional relationship between a structure of interest and other structures. Specifically, when viewed from the side, the direction from the first substrate (array substrate) to the second substrate (counter substrate) is defined as "upper," and the opposite direction is defined as "lower."

In addition, "inside" and "outside" refer to the relative positional relationship of the two parts with the display area as the reference. In other words, "inside" refers to the side closer to the display area relative to the other part, and "outside" refers to the side farther from the display area relative to the other part. However, the definitions of "inside" and "outside" here apply to the liquid crystal display device when it is not folded.

"Display device" refers to a display device in general that displays an image using a display panel. "Display panel" refers to a structure that displays an image using an electro-optical layer. For example, the term display panel may refer to a display cell that includes an electro-optical layer, or may refer to a structure in which other optical components (e.g., polarizing components, backlight, touch panel, etc.) are attached to the display cell. Here, the "electro-optical layer" may include a liquid crystal layer, an electrochromic (EC) layer, an organic EL, a micro LED, etc., as long as there is no technical contradiction. Therefore, the embodiments described below will be described using a liquid crystal panel that includes a liquid crystal layer as an example of the display panel, but this does not exclude application to display panels that include the other electro-optical layers described above.

(Example of the overall configuration of a display device)
1 is a plan view showing the appearance of the display device DSP of this embodiment. The display device DSP includes a display panel PNL, a flexible printed circuit board (second flexible circuit board) FPC2, a display driving IC chip DDIC, a printed circuit board PCB, and a flexible printed circuit board (first flexible circuit board) FPC1. A host device HOST is connected to the flexible printed circuit board FPC1. The display panel PNL, the flexible printed circuit board FPC2, the printed circuit board PCB, and the flexible printed circuit board FPC1 are connected in this order.

The display panel PNL includes a first substrate (also called an array substrate) SUB1, a second substrate (also called an opposing substrate) SUB2, a liquid crystal layer LC (described later), and a sealing material SE.

The display panel PNL has a display section (display area) DA that displays an image, and a frame-shaped non-display section (non-display area, peripheral area) NDA that surrounds the display section DA. The display section DA has a plurality of pixels PX arranged in a matrix in the first direction X and the second direction Y.

The second substrate SUB2 faces the first substrate SUB1. The first substrate SUB1 has a mounting portion MA that extends further in the second direction Y than the second substrate SUB2. The sealant SE is located in the non-display portion NDA, and bonds the first substrate SUB1 and the second substrate SUB2 together, as well as sealing the liquid crystal layer LC. A backlight device may be provided below the first substrate SUB1.

One end of the flexible printed circuit board FPC2 is connected to the mounting section MA, and the other end of the flexible printed circuit board FPC2 is connected to the printed circuit board PCB. The display driving IC chip DDIC is mounted on the flexible printed circuit board FPC2. The display driving IC chip DDIC may be mounted on the mounting section MA. The display driving IC chip DDIC outputs signals required for image display to the display panel PNL in a display mode in which an image is displayed.

For example, a power supply IC chip PSIC and a timing controller IC chip TCON are mounted on the printed circuit board PCB.

One end of the flexible printed circuit board FPC1 is connected to the printed circuit board PCB. The other end of the flexible printed circuit board FPC1 is connected to the host device HOST. The power supply IC chip PSIC and the timing controller IC chip TCON are supplied with power supply potential, ground potential, analog signals, display data signals, multiple differential signals, digital signals, and other reference potentials from the host device HOST via multiple wirings provided on the flexible printed circuit board FPC1. The power supply IC chip PSIC and the timing controller IC chip TCON generate control signals, display data signals, and power supplies for the display drive IC chip DDIC, and power supplies for the display panel PNL, based on the power supply potential, ground potential, analog signals, display data signals, and multiple differential signals supplied from the host device HOST.

A bending portion BP is provided between one end and the other end of the flexible printed circuit board FPC1. By bending the flexible printed circuit board FPC1 at the bending portion BP, the host device HOST can be positioned below the first substrate SUB1.

The display panel PNL of this embodiment may be a transmissive type with a transmissive display function that displays images by selectively transmitting light from the rear side of the first substrate SUB1, a reflective type with a reflective display function that displays images by selectively reflecting light from the front side of the second substrate SUB2, or a semi-transmissive type with both a transmissive display function and a reflective display function.

The display panel PNL may have any of the following configurations: a display mode that uses a vertical electric field along the normal to the main surface of the substrate; a display mode that uses an inclined electric field that is inclined obliquely with respect to the main surface of the substrate; and a display mode that uses an appropriate combination of the above-mentioned horizontal electric field, vertical electric field, and inclined electric field.

(Example of a circuit configuration of a display device)
FIG. 2 is a diagram showing a basic configuration of a pixel PX and an equivalent circuit of a display device DSP. A plurality of pixels PX are arranged in a matrix in a first direction X and a second direction Y. A plurality of scanning lines G (G1, G2, ...) are connected to a scanning line driving circuit GD. A plurality of signal lines S (S1, S2, ...) are connected to a signal line driving circuit SD. A plurality of common electrodes CE (CE1, CE2, ...) are connected to a voltage supply unit CD of a common voltage (Vcom) and are arranged across a plurality of pixels PX. One pixel PX is connected to one scanning line, one signal line, and one common electrode CE. Note that the scanning lines G and the signal lines S do not necessarily have to extend linearly, and may be partially bent. For example, the signal line S is assumed to extend in the second direction Y even if a portion of it is bent.

Each pixel PX includes a switching element SW, a pixel electrode PE, a common electrode CE, a liquid crystal layer LC, etc. The switching element SW is, for example, a thin film transistor (TFT) and is electrically connected to a scanning line G and a signal line S. The scanning line G is connected to the switching element SW in each of the pixels PX aligned in the first direction X. The signal line S is connected to the switching element SW in each of the pixels PX aligned in the second direction Y. The pixel electrode PE is electrically connected to the switching element SW. Each pixel electrode PE faces the common electrode CE, and the liquid crystal layer LC is driven by the electric field generated between the pixel electrode PE and the common electrode CE. The storage capacitance CS is formed, for example, between an electrode having the same potential as the common electrode CE and an electrode having the same potential as the pixel electrode PE.

(Example of the configuration of the flexible printed circuit board FPC1)
Fig. 3 is a diagram showing an example of the wiring configuration of the flexible printed circuit board FPC 1. Fig. 4 is a diagram showing each of the wirings of the flexible printed circuit board FPC 1 that connects between each of the output external terminals of the host device HOST and each of the input external terminals of the printed circuit board PCB.

Figure 3 shows the wiring of the flexible printed circuit board FPC1 that connects between each external terminal for output of the host device HOST and the printed circuit board PCB. As shown in Figure 3, the flexible printed circuit board FPC1 has a plurality of first wirings L1 to which a plurality of differential signals are input from the host device HOST, and a plurality of second wirings L2 to which a data signal, an analog signal, or a power supply potential is input from the host device HOST. The flexible printed circuit board FPC1 also has a plurality of first ground potential wirings LG1 to which a ground potential is input from the host device HOST, and a plurality of second ground potential wirings LG2 to which a ground potential is input from the host device HOST.

The flexible printed circuit board FPC1 also includes a first shield wiring SHI1 connected to the multiple first ground potential wirings LG1, and a second shield wiring SHI2 connected to the multiple second ground potential wirings LG2. The first shield wiring SHI1 is provided along the wiring direction of the multiple first wirings L1 so as to cover the multiple first wirings L1. The second shield wiring SHI2 is provided so as to cover the multiple second wirings L2 and the first shield wiring SHI1. Therefore, the second shield wiring SHI2 overlaps with the first shield wiring SHI1. Furthermore, the second ground potential wiring LG2 and the multiple second wirings L2 are provided outside the first ground potential wiring LG1 and the multiple first wirings L1 in a planar view.

However, as illustrated in FIG. 5, the second shield wiring SHI2 is not provided at the bent portion BP of the flexible printed circuit board FPC1. In other words, the second shield wiring SHI2 has an opening at the bent portion BP of the flexible printed circuit board FPC1.

The host device HOST has a plurality of first external terminals ((S1P, S1N), (S2P, S2N), (S3P, S3N), (S4P, S4N)) that output a plurality of differential signals. The plurality of first external terminals ((S1P, S1N), (S2P, S2N), (S3P, S3N), (S4P, S4N)) are respectively connected to a plurality of first wirings L1. The host device HOST also has a plurality of second external terminals A1-A12 that output a data signal, an analog signal, or a power supply potential. The plurality of second external terminals A1-A12 are respectively connected to a plurality of second wirings L2. The host device HOST has a plurality of first ground potential external terminals GND2 that output a ground potential, and a plurality of second ground potential external terminals GND1 that output a ground potential. The plurality of first ground potential external terminals GND2 are respectively connected to a plurality of first ground potential wirings LG1. The multiple second ground potential external terminals GND1 are respectively connected to the multiple second ground potential wirings LG2.

As shown in FIG. 3, the timing controller IC chip TCON mounted on the printed circuit board PCB has a plurality of differential input circuits IN1-IN4. Each of the differential input circuits IN1-IN4 includes a differential circuit and a termination resistor. For example, the differential input circuit IN1 is connected to a pair of first differential output terminals S1P, S1N of the host device HOST, and the differential input circuit IN2 is connected to a pair of second differential output terminals S2P, S2N of the host device HOST. Similarly, the differential input circuit IN3 is connected to a pair of third differential output terminals S3P, S3N of the host device HOST, and the differential input circuit IN4 is connected to a pair of fourth differential output terminals S4P, S4N of the host device HOST.

As shown in FIG. 4, the output external terminals of the host device HOST and the input external terminals of the printed circuit board PCB connected to the output external terminals of the host device HOST are indicated by the same reference symbols. For example, the first external terminals ((S1P, S1N), (S2P, S2N), (S3P, S3N), (S4P, S4N)) of the host device HOST are respectively connected to the first external terminals for input ((S1P, S1N), (S2P, S2N), (S3P, S3N), (S4P, S4N)) of the printed circuit board PCB. The second external terminals A1-A12 of the host device HOST are respectively connected to the second external terminals for input A1-A12 of the printed circuit board PCB. The multiple first ground potential external terminals GND2 of the host device HOST are respectively connected to the multiple first ground potential external terminals GND2 for input of the printed circuit board PCB, and the multiple second ground potential external terminals GND1 of the host device HOST are respectively connected to the multiple second ground potential external terminals GND1 for input of the printed circuit board PCB. The other configurations are the same as those in FIG. 3, and the description thereof will be omitted.

Figure 5 is a plan view illustrating the configuration of each wiring of the flexible printed circuit board FPC1. Figure 6 is a schematic cross-sectional view of the flexible printed circuit board FPC1 along line A-A in Figure 5. Figure 7 is a schematic cross-sectional view of the flexible printed circuit board FPC1 along line B-B in Figure 5. Note that in Figure 5, in order to simplify the drawing, each wiring L1, L2, LG1, and LG2 described in Figures 3 and 4 is written to the side (or above) of the reference field symbol indicating each external terminal for input of the printed circuit board PCB. Also, on the left side of Figures 6 and 7, the number of wiring L2 is drawn to be small in order to simplify the drawing.

In FIG. 5, the second shield wiring SHI2 is provided on both sides of the bent portion BP of the flexible printed circuit board FPC1. In other words, the flexible printed circuit board FPC1 has an opening at the bent portion BP.

The first shield wiring SHI1 is disposed below the second shield wiring SHI2, is provided along the wiring direction of the flexible printed circuit board FPC1 over almost the entire area, and covers the multiple first wirings L1. Therefore, the second shield wiring SHI2 overlaps with the first shield wiring SHI1 in a planar view.

As shown in Figures 3 and 4, the multiple first wirings L1 are provided between the multiple first ground potential wirings LG1. In addition, the second ground potential wiring LG2 and the multiple second wirings L2 are provided outside the multiple first ground potential wirings LG1 and the multiple first wirings L1 in a plan view.

As shown in Figures 6 and 7, wiring L1, L2, LG1, and LG2 are provided on the underside of the substrate 60 of the flexible printed circuit board FPC1.

As shown in FIG. 6, at the bent portion BP, a first shield wiring SHI1 is provided on the upper side of the surface of the substrate 60 located above the multiple first wirings L1 so as to cover the multiple first wirings L1. The multiple first wirings L1 are arranged between the multiple first ground potential wirings LG1. The upper and side surfaces of the first shield wiring SHI1 are covered with a first protective film PR1 such as an insulating layer, and a second protective film PR2 such as an insulating layer is provided on the upper surface of the first protective film PR1. In addition, each of the wirings L1, L2, LG1, and LG2 provided on the lower surface of the substrate 60 of the flexible printed circuit board FPC1 is covered with a third protective film PR3 such as an insulating layer.

7, the first shield wiring SHI1 is connected to a plurality of first ground potential wirings LG1. The second shield wiring SHI2 includes shield wiring portions SHI20, SHI21, and SHI22. The shield wiring portions SHI21 and SHI22 are connected to a plurality of second ground potential wirings LG2 different from the first ground potential wiring LG1 on both sides of the substrate 60. The upper sides of the plurality of second wirings L2 are covered by the second shield wirings SHI21 and SHI22. The shield wiring portion SHI20 is connected to the shield wiring portions SHI21 and SHI22 via a through hole TH1 provided in the first protective film PR1. As a result, the second shield wiring SHI2 is provided on the upper side of the first shield wiring SHI1 so as to cover the first shield wiring SHI1. As shown in FIG. 7, at least the top and side surfaces of the first shield wiring SHI1 are covered with a first protective film PR1 such as an insulating layer. The first shield wiring SHI1 and the second shield wiring SHI2 may be connected via a through hole TH1 provided in the first protective film. As shown in FIG. 7, the top and side surfaces of the second shield wiring SHI2 are covered with a second protective film PR2, and the wirings L1, L2, LG1, and LG2 provided on the bottom surface of the substrate 60 of the flexible printed circuit board FPC1 are covered with a third protective film PR3.

Figures 8 and 9 are schematic cross-sectional views of a flexible printed circuit board FPC1 according to a comparative example. Figure 8 shows a cross-sectional view of the bent portion of the flexible printed circuit board FPC1 corresponding to Figure 6, and Figure 9 is a cross-sectional view of the flexible printed circuit board FPC1 corresponding to Figure 7. Note that in Figures 8 and 9, the wiring provided on the underside of the substrate 60 of the flexible printed circuit board FPC1 is the same as in Figures 6 and 7.

As shown in FIG. 8, in the comparative example, the first shield wiring SHI1 as shown in FIG. 6 is not provided in the folded portion of the flexible printed circuit board FPC1. Also, as shown in FIG. 9, in the comparative example, the first shield wiring SHI1 and the second shield wiring SHI2 as shown in FIG. 7 are not provided, and only the shield wiring SHIA that is commonly connected to the multiple first ground potential wirings LG1 and the multiple second ground potential wirings LG2 is provided.

In the shield wiring configuration shown in Figures 8 and 9, the signal components of the multiple first wirings L1, to which differential signals are input, may be transmitted to the shield wiring SHIA, causing EMI noise. Furthermore, this noise may be transmitted to the signals input to the multiple second wirings L2, causing the display device to malfunction.

On the other hand, in an embodiment of the present invention, as shown in Figures 5, 6, and 7, the upper sides of the multiple first wirings L1 to which differential signals are input are covered by first shield wiring SHI1 connected to multiple first ground potential wirings LG1 over the entire wiring direction of the flexible printed circuit board FPC1. The upper sides of the multiple second wirings L2 are covered by second shield wiring SHI2 connected to multiple second ground potential wirings LG2 different from the multiple first ground potential wirings LG1. Furthermore, except at the position of the bent portion BP, the second shield wiring SHI2 is provided to overlap and cover the first shield wiring SHI1.

As a result, even if EMI noise occurs due to the differential signals input to the multiple first wirings L1, the multiple second wirings L2 covered by the second shield wiring SHI2 are not significantly affected by the noise. Therefore, malfunction of the display device can be prevented.

The first shield wiring SHI is covered by the second shield wiring SHI2, which reduces the generation of EMI noise.

At the position of the bending portion BP of the flexible printed circuit board FPC1, only the first shield wiring SHI1 is present, and the second shield wiring SHI2 is not present. In other words, the second shield wiring SHI2 has an opening at the position of the bending portion BP. This makes it easy to bend the flexible printed circuit board FPC1 at the position of the bending portion BP. Furthermore, bending the flexible printed circuit board FPC1 does not cause a break in the second shield wiring SHI2. Therefore, even if the flexible printed circuit board FPC1 is bent at the position of the bending portion BP, the shielding effect of the second shield wiring SHI2 can be maintained.

The signals input to the multiple first wirings L1 are not limited to differential signals, and may be other digital signals or AC signals. Furthermore, the first shield wiring SHI and the second shield wiring SHI2 may be connected to a reference voltage or power supply voltage other than the ground potential. For example, a first reference potential may be supplied to the first shield wiring SHI, and a second reference potential that is equal to or different from the first reference potential may be supplied to the second shield wiring SHI2.

All display devices that can be implemented by a person skilled in the art through appropriate design modifications based on the display device described above as an embodiment of the present invention are within the scope of the present invention as long as they include the gist of the present invention.

A person skilled in the art may come up with various modifications and alterations within the scope of the concept of the present invention, and it is understood that these modifications and alterations also fall within the scope of the present invention. For example, to the above-mentioned embodiments, those in which a person skilled in the art has appropriately added or deleted components or modified the design, or added or omitted steps or changed conditions, are also included in the scope of the present invention as long as they contain the gist of the present invention.

In addition, other effects and advantages brought about by the aspects described in this embodiment that are obvious from the description in this specification or that would be conceivable to a person skilled in the art are naturally understood to be brought about by the present invention.

Various inventions can be created by appropriately combining multiple components disclosed in the above embodiments. For example, some components may be deleted from all components shown in the embodiments. Furthermore, components across different embodiments may be appropriately combined.

DSP: Display device PNL: Display panel FPC1, FPC2: Flexible printed circuit board PCB: Printed circuit board DDIC: Display driver IC chip PSIC: Power supply IC chip TCON: Timing controller IC chip HOST: Host device BP: Bending portion SHI1: First shield wiring SHI2: Second shield wiring LG1: First ground potential wiring LG2: Second ground potential wiring L1: First wiring L2: Second wiring

Claims (12)

A display panel;
a first flexible circuit board connected to the display panel;
The first flexible circuit board is
a plurality of first wirings to which differential signals are input;
A plurality of second wirings to which data signals are input;
A first ground potential wiring;
A second ground potential wiring;
a first shield wiring connected to the first ground potential wiring;
a second shield wiring connected to the second ground potential wiring;
an insulating layer provided between the first shield wiring and the second shield wiring;
the first wirings are covered with the first shield wiring,
the second wirings are covered with the second shield wiring;
the first shield wiring and the second shield wiring have a width in a direction intersecting an extending direction of the first wirings and the second wirings,
the first shield wiring and the second shield wiring overlap each other on the inner side of the second shield wiring in a width direction,
the first flexible circuit board has a bent portion;
At the bent portion, the first shield wiring does not have an opening, and the second shield wiring has an opening.
Display device. A display panel;
a first flexible circuit board connected to the display panel;
The first flexible circuit board is
A plurality of first wirings;
A plurality of second wirings;
A first ground potential wiring;
A second ground potential wiring;
a first shield wiring connected to the first ground potential wiring;
a second shield wiring connected to the second ground potential wiring;
an insulating layer provided between the first shield wiring and the second shield wiring;
the first wirings are covered with the first shield wiring,
the second wirings are covered with the second shield wiring;
the first shield wiring and the second shield wiring have a width in a direction intersecting an extending direction of the first wirings and the second wirings,
the first flexible circuit board has a bent portion;
At the bent portion, the first shield wiring does not have an opening, and the second shield wiring has an opening.
Display device. A display panel;
a first flexible circuit board connected to the display panel;
The first flexible circuit board is
A plurality of first wirings;
A plurality of second wirings;
an insulating layer provided between the first shield wiring and the second shield wiring;
the first wirings are covered with the first shield wiring,
the second wirings are covered with the second shield wiring;
the first shield wiring and the second shield wiring have a width in a direction intersecting an extending direction of the first wirings and the second wirings,
the first flexible circuit board has a bent portion;
At the bent portion, the first shield wiring does not have an opening, and the second shield wiring has an opening.
Display device. A display panel;
a first flexible circuit board connected to the display panel;
The first flexible circuit board is
a plurality of first wirings to which differential signals are input;
A plurality of second wirings to which data signals are input;
A first ground potential wiring;
A plurality of second ground potential wirings;
a first shield wiring connected to the first ground potential wiring;
a second shield wiring connected to the plurality of second ground potential wirings;
an insulating layer provided between the first shield wiring and the second shield wiring;
the first wirings are covered with the first shield wiring,
the second wirings are covered with the second shield wiring;
the first shield wiring and the second shield wiring have a width in a direction intersecting an extending direction of the first wirings and the second wirings,
a width of the first shield wiring is narrower than a distance between the second ground potential wirings to which the second shield wiring is connected in a width direction, and the first shield wiring and the second shield wiring have an overlapping portion inside the second shield wiring.
Display device. A display panel;
a first flexible circuit board connected to the display panel;
The first flexible circuit board is
a plurality of first wirings to which differential signals are input;
A plurality of second wirings to which data signals are input;
A first ground potential wiring;
A plurality of second ground potential wirings;
a first shield wiring connected to the first ground potential wiring;
a second shield wiring connected to the plurality of second ground potential wirings;
an insulating layer provided between the first shield wiring and the second shield wiring;
the first wirings are covered with the first shield wiring,
the second wirings are covered with the second shield wiring;
the first shield wiring and the second shield wiring have a width in a direction intersecting an extending direction of the first wirings and the second wirings,
the width of the second shield wiring is wider than the width of the first shield wiring,
a first region in which the first shield wiring and the second shield wiring overlap in a width direction;
a second region of the second shield wiring on an outer side of one end of the first shield wiring in a width direction;
a third region of the second shield wiring on the outer side of the other end of the first shield wiring in the width direction;
a width direction length of the third region is longer than a width direction length of the second region, and the number of the second ground wirings in the third region is greater than the number of the second ground wirings in the second region.
Display device. 6. The display device according to claim 1, 2, 4 or 5,
the second ground potential wiring and the plurality of second wirings are located outside the first ground potential wiring and the plurality of first wirings in a plan view. A wiring board including a first flexible circuit board,
The first flexible circuit board is
a plurality of first wirings to which differential signals are input;
A plurality of second wirings to which data signals are input;
A first ground potential wiring;
A second ground potential wiring;
a first shield wiring connected to the first ground potential wiring;
a second shield wiring connected to the second ground potential wiring;
an insulating layer provided between the first shield wiring and the second shield wiring;
the first wirings are covered with the first shield wiring,
the second wirings are covered with the second shield wiring;
the first shield wiring and the second shield wiring have a width in a direction intersecting an extending direction of the first wirings and the second wirings,
the first shield wiring and the second shield wiring overlap each other on the inner side of the second shield wiring in a width direction,
the first flexible circuit board has a bent portion,
At the bent portion, the first shield wiring does not have an opening, and the second shield wiring has an opening.
Wiring board. A wiring board including a first flexible circuit board,
The first flexible circuit board is
A plurality of first wirings;
A plurality of second wirings;
A first ground potential wiring;
A second ground potential wiring;
a first shield wiring connected to the first ground potential wiring;
a second shield wiring connected to the second ground potential wiring;
an insulating layer provided between the first shield wiring and the second shield wiring;
the first wirings are covered with the first shield wiring,
the second wirings are covered with the second shield wiring;
the first shield wiring and the second shield wiring have a width in a direction intersecting an extending direction of the first wirings and the second wirings,
the first flexible circuit board has a bent portion,
At the bent portion, the first shield wiring does not have an opening, and the second shield wiring has an opening.
Wiring board. A wiring board including a first flexible circuit board,
The first flexible circuit board is
A plurality of first wirings;
A plurality of second wirings;
an insulating layer provided between the first shield wiring and the second shield wiring;
the first wirings are covered with the first shield wiring,
the second wirings are covered with the second shield wiring;
the first shield wiring and the second shield wiring have a width in a direction intersecting an extending direction of the first wirings and the second wirings,
the first flexible circuit board has a bent portion;
At the bent portion, the first shield wiring does not have an opening, and the second shield wiring has an opening.
Wiring board. a plurality of first wirings to which differential signals are input;
A plurality of second wirings to which data signals are input;
A first ground potential wiring;
A plurality of second ground potential wirings;
a first shield wiring connected to the first ground potential wiring;
a second shield wiring connected to the plurality of second ground potential wirings;
an insulating layer provided between the first shield wiring and the second shield wiring;
the first wirings are covered with the first shield wiring,
the second wirings are covered with the second shield wiring;
the first shield wiring and the second shield wiring have a width in a direction intersecting an extending direction of the first wirings and the second wirings,
a width of the first shield wiring is narrower than a distance between the second ground potential wirings to which the second shield wiring is connected in a width direction, and the first shield wiring and the second shield wiring have an overlapping portion inside the second shield wiring.
Wiring board. a plurality of first wirings to which differential signals are input;
A plurality of second wirings to which data signals are input;
A first ground potential wiring;
A plurality of second ground potential wirings;
a first shield wiring connected to the first ground potential wiring;
a second shield wiring connected to the plurality of second ground potential wirings;
an insulating layer provided between the first shield wiring and the second shield wiring;
the first wirings are covered with the first shield wiring,
the second wirings are covered with the second shield wiring;
the first shield wiring and the second shield wiring have a width in a direction intersecting an extending direction of the first wirings and the second wirings,
the width of the second shield wiring is wider than the width of the first shield wiring,
a first region in which the first shield wiring and the second shield wiring overlap in a width direction;
a second region of the second shield wiring on an outer side of one end of the first shield wiring in a width direction;
a third region of the second shield wiring on the outer side of the other end of the first shield wiring in the width direction;
a width direction length of the third region is longer than a width direction length of the second region, and the number of the second ground wirings in the third region is greater than the number of the second ground wirings in the second region.
Wiring board. 12. The wiring board according to claim 7, wherein
The second ground potential wiring and the plurality of second wirings are located outside the first ground potential wiring and the plurality of first wirings in a plan view.

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