JP2011112786A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device wherein influence on a circuit member is satisfactorily prevented, by reducing electromagnetic wave noise radiated to the circuit member and which is thin and whose optical characteristics are enhanced, and manufacturing steps are simplified. <P>SOLUTION: In the liquid crystal display device including a first substrate, a liquid crystal layer, a second substrate and the circuit member and further having a wire grid polarizer, the wire grid polarizer is grounded or maintained at a fixed voltage. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a liquid crystal display device. More specifically, the present invention relates to a liquid crystal display device suitably used for a touch panel.

Liquid crystal display devices are easy to reduce in thickness and power consumption among flat panel displays currently in practical use, and are widely used as display devices for televisions, personal computer displays, portable terminal displays, and the like. It is also widely used for mobile terminals such as mobile phones, PDAs, PDA phones, mobile game machines, and tablet PCs.

A general liquid crystal display device is usually a liquid crystal display panel having a pair of substrates and a liquid crystal layer sandwiched between the pair of substrates, a single polarizing plate in a reflective liquid crystal display, or a transmissive liquid crystal display. And two polarizing plates.

The polarizing plate generally has a polarizing film in which an iodine complex or a dichroic dye is adsorbed mainly on a polyvinyl alcohol film (PVA film) as a polarizer. Since this polarizing film is produced by stretching, it tends to shrink. Moreover, since the mechanical strength of the PVA film itself is weak, the film is easy to tear. Therefore, a protective film (protective layer) such as TAC (triacetyl cellulose) for protecting the polarizing film is usually bonded onto the main surface of the polarizing film. Thereby, while complementing the intensity | strength of a polarizing plate, the reliability of a polarizing film is ensured.

By the way, display devices with a screen input function that can detect a position where a contact object such as a pen or a finger touches on a display screen have become widespread. As a means for detecting the position where a contact object such as a pen or a finger contacts on the display screen, a touch panel, a touch sensor, etc. are widely used. When the touch panel is used integrally with a display device, the display on the display panel is displayed. The touch panel function is realized by arranging the touch panel on the surface side.

As a technology related to a liquid crystal display device using a polarizing plate and a touch panel together, a touch sensing unit is formed along the periphery on an electrostatic induction insulating layer formed on the second insulating substrate and on the electrostatic induction insulating layer A display panel including an electrostatic induction pattern layer, an electrostatic induction insulating layer, and a dielectric layer covering the electrostatic induction pattern layer is disclosed (for example, see Patent Document 1). Further, in a touch panel which is installed on a high voltage drive type display surface and is formed by forming a transparent conductive film and a transparent insulating film on both sides of the substrate with a substrate glass interposed therebetween, a transparent insulating film on the display side of the touch panel There is disclosed a capacitive touch panel in which a transparent conductive film is further formed on (see, for example, Patent Document 2).

JP 2007-310885 A (2nd and 5th pages) JP 63-174120 A (first and third pages)

In the display panel described above, the polarizing layer is formed using a wire grid polarizer, but electromagnetic noise is blocked using a common electrode or an electromagnetic wave blocking layer. In the case of using the common electrode, since a driving voltage is applied to the common electrode, there is room for contrivance in terms of sufficiently blocking electromagnetic noise. In addition, when an electromagnetic wave blocking layer is used, a layer for blocking electromagnetic waves is formed, so there is room for improvement in terms of reducing the number of components and simplifying the manufacturing process. Furthermore, since the liquid crystal driving unit is not completely shielded, electromagnetic wave noise wraps around from a direction other than the shielding layer and affects the touch sensing unit. For this reason, there was room for improvement in terms of the accuracy of the touch sensing unit.

In addition, the above-described capacitive touch panel can shield electromagnetic noise generated when driving a display such as a plasma display panel (PDP) due to its configuration, and also for a high-voltage driven display such as a PDP. It is said that high-accuracy position detection can be performed by a precision electric capacity type touch panel.

However, since the liquid crystal driving unit is not completely shielded, the electromagnetic wave noise wraps around from a direction other than the shielding layer and affects the touch panel. There was room for ingenuity in terms of blocking electromagnetic wave noise more sufficiently and improving the accuracy of the touch part. Moreover, since a transparent conductive film is formed only for shielding electromagnetic wave noise, there is room for contrivance in terms of reducing the number of components and simplifying the manufacturing process.

In summary, in the liquid crystal display device including the circuit member such as the position detecting conductive layer 2 shown in FIG. 14, the electromagnetic wave noise from the liquid crystal driving device unit 10 during the driving of the liquid crystal display device is caused by the position detecting conductive layer. There was an influence on the circuit member such as being radiated to the circuit member 2 and the like, and the position detection accuracy was lowered. Measures to prevent this effect include adding a shield layer to reduce electromagnetic noise, or adding a circuit for removing electromagnetic noise to the position detection circuit, but reducing the number of components and There was room for improvement from the point of simplification of the manufacturing process.

Moreover, in a liquid crystal display device including a circuit member such as a touch panel, it is difficult to reduce the thickness of the entire liquid crystal display device including the circuit member. In addition, the light utilization efficiency (reflectance) of the liquid crystal display device is lowered by the circuit member, and the display quality such as the contrast ratio is lowered due to the gap between the circuit member and the polarizing plate.

The present invention has been made in view of the above-described situation, and sufficiently reduces the electromagnetic noise radiated to the circuit member to sufficiently prevent the influence on the circuit member, is thinner, has improved optical characteristics, and has a manufacturing process. An object of the present invention is to provide a simplified liquid crystal display device.

The present inventors have studied various types of liquid crystal display devices that are thinner and simplified in manufacturing process while reducing electromagnetic noise radiated from the liquid crystal driving device to the circuit members and sufficiently preventing the influence on the circuit members. As a result, attention was paid to the polarizing layer and the electromagnetic wave shielding layer of the liquid crystal display device. And while finding out the disadvantage of providing each of a polarizing layer and an electromagnetic wave shielding layer, the liquid crystal display device has a wire grid polarizer, and the wire grid polarizer is grounded or is at a constant voltage. By being held, it is possible to reduce the electromagnetic wave noise radiated to the circuit member and prevent the influence on the circuit member sufficiently, and to make the liquid crystal display device thinner and simplified in the manufacturing process. As a result, the inventors have arrived at the present invention by conceiving that the above problems can be solved brilliantly.

That is, this invention is a liquid crystal display device provided with the 1st board | substrate, the liquid crystal layer, the 2nd board | substrate, and the circuit member, Comprising: The said liquid crystal display device further has a wire grid polarizer, The said wire grid polarizer Is a liquid crystal display device that is grounded or held at a constant voltage.

The liquid crystal display device includes a wire grid polarizer, and the wire grid polarizer is grounded or held at a constant voltage.
By using an electro-optical device using a wire grid polarizer, the following effects can be exhibited.
(1) Electromagnetic wave noise radiated from the liquid crystal drive unit to the circuit member is reduced. Thereby, the influence on a circuit member can fully be prevented. (2) A wire grid polarizer combines a polarizing function and a shielding function. Therefore, it is not necessary to provide both the shield layer and the polarizing plate, and the module can be thinned and the entire apparatus can be thinned. (3) The number of components can be reduced, thereby improving the optical characteristics (brightness and contrast ratio). (4) The manufacturing process can be simplified.

The configuration of the liquid crystal display device of the present invention is not particularly limited by other components as long as such components are essential.
A preferred embodiment of the liquid crystal display device of the present invention will be described in detail below.

As one preferred embodiment of the liquid crystal display device of the present invention, the wire grid polarizer includes a front polarizing plate and a back polarizing plate, and the liquid crystal layer is sandwiched between the front polarizing plate and the back polarizing plate. In addition, there is a form in which an electrical conduction path is formed so that the front polarizing plate and the back polarizing plate are electrically connected. According to this aspect, it is possible to further sufficiently reduce the electromagnetic wave noise radiated from the liquid crystal driving unit to the circuit member. That is, the electromagnetic wave noise radiated from the liquid crystal drive unit to the display surface side is sufficiently shielded by the wire grid polarizer (table) and sufficiently prevents the circuit member from being affected, and in the opposite direction to the display surface side. Since the radiated electromagnetic wave noise is also sufficiently shielded by the wire grid polarizer (back), it is possible to sufficiently prevent this from wrapping around and affecting the circuit member.

As one of preferable modes of the liquid crystal display device of the present invention, the electric conduction path is formed so as to short-circuit the outer edge portion of the front polarizing plate and the outer edge portion of the back polarizing plate. It is done. According to this embodiment, the influence on the circuit member can be sufficiently prevented without providing a complicated noise removal circuit, and the effects of the present invention can be more fully exhibited.

As one of the preferred embodiments of the liquid crystal display device of the present invention, the liquid crystal display device has a back polarizing plate disposed between the first substrate and the liquid crystal layer, and between the liquid crystal layer and the second substrate. The form by which the surface polarizing plate is arrange | positioned is mentioned. According to this embodiment, the polarized light that has passed through the polarizing plate does not pass through the first substrate and the second substrate before reaching the next polarizing plate, and a decrease in the degree of polarization can be prevented. Since the transmission and shielding efficiency of the liquid crystal driving device is increased, the luminance and contrast ratio can be improved as a result.

For example, the form which arrange | positions a back polarizing plate directly on the said board | substrate is preferable. Arranging the back polarizing plate directly on the substrate means that the back polarizing plate is directly disposed between the substrate and the back polarizing plate without any other member interposed therebetween. With this configuration, the polarizing plate attaching process can be reduced.

As one of the preferable forms of the liquid crystal display device of this invention, the said circuit member has the form which is a conductive layer for position detection provided in a touch panel. According to this aspect, the electromagnetic wave noise radiated to the position detection conductive layer in the liquid crystal display device of the present invention is sufficiently reduced, so that the accuracy of position detection as a touch panel can be sufficiently improved.

As one of the preferable forms of the liquid crystal display device of this invention, the said position detection conductive layer has the form arrange | positioned between the said liquid crystal layer and said 2nd board | substrate. According to this embodiment, the protective layer of the touch panel is not necessary, and the liquid crystal display device can be sufficiently thinned.
The position detecting conductive layer is disposed between the liquid crystal layer and the second substrate, and the front polarizing plate is disposed between the liquid crystal layer and the second substrate. Is preferred.
With this configuration, the gap between the position detecting conductive layer and the front polarizing plate is reduced, the loss of external light reflection and reflected light is reduced, and the luminance and contrast ratio are improved.

As one of the preferable forms of the liquid crystal display device of this invention, the said liquid crystal display device has the form by which the color filter is arrange | positioned at the display surface side rather than the said surface polarizing plate. With this configuration, the polarized light that has passed through the polarizing plate does not pass through the first substrate or the second substrate before reaching the next polarizing plate, and a decrease in the degree of polarization can be prevented. Since the transmission and shielding efficiency in the liquid crystal driving device is increased, the luminance and contrast ratio can be improved as a result.

The liquid crystal display device of the present invention can be suitably used for a transmissive liquid crystal display, a reflective liquid crystal display, and the like.

According to the liquid crystal display device of the present invention, the electromagnetic wave noise radiated to the circuit member is reduced to sufficiently prevent the influence on the circuit member, the liquid crystal is thinner, the optical characteristics are improved, and the manufacturing process is simplified. It can be a display device.

2 is a schematic cross-sectional view of the liquid crystal display device of Embodiment 1. FIG. 2 is a schematic plan view of the liquid crystal display device of Embodiment 1. FIG. 1 is a cross-sectional view of a liquid crystal display device of Embodiment 1. FIG. 1 is a perspective view of a wire grid polarizer of Embodiment 1. FIG. It is a perspective view of the wire grid polarizer of the modification of Embodiment 1. 3 is a conceptual diagram of an electromagnetic wave shield in the liquid crystal display device of Embodiment 1. FIG. 6 is a schematic cross-sectional view of a liquid crystal display device of Embodiment 2. FIG. It is a cross-sectional schematic diagram of the liquid crystal display device of Embodiment 3. It is sectional drawing of the liquid crystal display device of Embodiment 3. 6 is a schematic cross-sectional view of a liquid crystal display device of Embodiment 4. FIG. 7 is a schematic cross-sectional view of a liquid crystal display device of Embodiment 5. FIG. FIG. 10 is a schematic view in plan view of a display surface of a liquid crystal display device of Embodiment 5. 7 is a cross-sectional view of a liquid crystal display device according to Embodiment 5. FIG. It is a cross-sectional schematic diagram of a conventional liquid crystal display device.

In the present specification, the front polarizing plate and the back polarizing plate mean a polarizing plate on the front side as viewed from the display surface side and a polarizing plate on the back side as viewed from the display surface side, respectively.
The liquid crystal drive unit means a liquid crystal layer and a circuit having a function of driving the liquid crystal layer, and includes at least a polarizing plate, a common electrode, a liquid crystal layer, and a TFT drive circuit.
Furthermore, the circuit member may be a circuit member included other than the liquid crystal driving device. More preferably, the circuit member is a conductive layer for position detection provided on the touch panel.

Hereinafter, the present invention will be described in more detail with reference to embodiments, but the present invention is not limited only to these embodiments.

(Embodiment 1)
FIG. 1 is a schematic cross-sectional view of the liquid crystal display device according to the first embodiment.
As shown in FIG. 1, the liquid crystal display device according to the present embodiment includes a second substrate 5, a position detection conductive layer 2, an insulating layer 13, a wire grid polarizer (table) 14, and a color filter 6 from the display surface side. , Common electrode 7, liquid crystal layer 8, TFT drive circuit 9, insulating layer 13, wire grid polarizer (back) 15, and first substrate 11. The wire grid polarizer (front) 14 and the wire grid polarizer (back) 15 are electrically connected at the outer edge of the display area, and they are grounded to the ground (GND). Note that the voltage may be held at a constant voltage. In this embodiment, in order to ground the wire grid polarizer (front) 14 and the wire grid polarizer (back) 15 in this way, in this embodiment, first, the wire grid polarizer (front) 14 and the wire grid polarizer (back) ) 15 through the conductive material 18, and is connected to the outside through the same lead line as the liquid crystal driving circuit or one or a plurality of electric conductive lines. As a specific form of conduction, there is a form in which conduction is established through a conductive material 18 inserted in a non-display area of the liquid crystal display device other than the area where the drive circuit and the wiring are arranged.
A transparent conductive layer is preferably used as the position detecting conductive layer.
In the drawings in the present application, the order in which members are stacked in a liquid crystal display device is shown.

FIG. 2 is a schematic plan view of the liquid crystal display device according to the first embodiment.
In the first embodiment, as described above, two wire grid polarizers (a wire grid polarizer (front) 14 and a wire grid polarizer (back) 15) are provided between the first substrate 11 and the second substrate 5. Has been placed. In such a form, as shown in FIG. 2, in the non-display area of the liquid crystal display device, the driving circuit and wiring (for example, a gate driver IC (integrated circuit) 41, a source driver IC 43, a flexible printed circuit 45, etc.) Conductivity between two wire grid polarizers is obtained via a spot-like (spot-like) conductive material 18a and / or a linear conductive material 18b inserted in a region other than the region where the electrode is disposed. It is preferable. In FIG. 2, the source driver IC 43 is connected to the drive circuit side 47 via the flexible printed circuit 45.

FIG. 3 is a cross-sectional view of the liquid crystal display device according to the first embodiment.
The liquid crystal display device of the present embodiment includes each member in the order described above from the display surface side. As shown in FIG. 3, the wire grid polarizer (front) 14 and the wire grid polarizer (back). 15 is electrically connected to the outer edge of the display region (the region other than the region where the driving circuit and the wiring are arranged in the non-display region of the liquid crystal display device described above) through the conductive material 18. Has been.

FIG. 4 is a perspective view of the wire grid polarizer of the first embodiment.
As shown in FIG. 4, the wire grid polarizer according to the first embodiment has a metal fine wire portion 16 in an oblique direction and a fine metal wire connected to a conductive material (not shown) when the main surface of the substrate is viewed in plan. It has a conducting portion 17.
FIG. 5 is a perspective view of a wire grid polarizer according to a modification of the first embodiment.
As a modification of the first embodiment, a wire grid polarizer having the form shown in FIG. 5 can be cited. That is, in the wire grid polarizer shown in FIG. 5, in addition to the metal thin wire portion 124m and the metal thin wire conducting portion 124s in the oblique direction, the portion overlapping the light shielding area at the pixel boundary is connected by the metal thin wire 124p. Improved.
The wire grid polarizer shown in FIGS. 4 and 5 can be suitably applied to both the wire grid polarizer (front) 14 and the wire grid polarizer (back) 15 in each embodiment of the present application.

In the present embodiment, the following effects are exhibited.
First, by shielding the liquid crystal drive unit 10, electromagnetic noise radiated to the outside is reduced. As a result, noise to the electrostatic capacitance type and electrostatic induction type position detection conductive layer is reduced, and the accuracy of position detection can be improved without providing a complicated noise removal circuit. In particular, the touch panel is preferably a capacitive touch panel.

The effect of the wire grid polarizer (front) 14 and the wire grid polarizer (back) 15 having both a polarizing function and a shielding function is as follows: (1) Compared to the case where both a shielding layer and a polarizing plate are used. The overall thickness can be reduced, (2) the shield layer can be reduced, the manufacturing process can be simplified, and (3) the reduction in transmittance lost in the shield layer can be eliminated. It is.

Furthermore, the effect of arranging the wire grid type polarizer (back) 15 on the substrate and grounding the wire grid type polarizer to a constant voltage including GND is that (1) unnecessary radiation of electromagnetic waves can be reduced. 2) The polarizing plate attaching step can be reduced.

And the effect at the time of arrange | positioning the conductive layer 2 for position detection, the wire grid polarizer (front) 14, and the wire grid polarizer (back) 15 between the 2nd board | substrate 5 and the 1st board | substrate 11 is (1) There is no gap between the position detecting conductive layer 2 and the polarizing plate, the loss of external light reflection and reflected light is reduced, and the luminance and contrast ratio are improved. (2) The protective layer of the position detecting conductive layer 2 is This is unnecessary, and can contribute to thinning the module and thinning the entire apparatus.
In addition, an electrical resistance can be made small by performing conduction | electrical_connection by the two electroconductive material (electrical conductive wire) pulled out on both sides of the wire grid polarizer.

In summary, the effects of the present embodiment include (I) simplification of the manufacturing process, thinning of the entire apparatus, and (II) improvement of optical characteristics.
As the simplification of the manufacturing process (I) and the thinning of the entire apparatus, the shielding layer is not required and the manufacturing process is simplified by combining the polarization function and the electromagnetic wave shielding function. Furthermore, when the position detection conductive layer is disposed between the first substrate and the second substrate, a protective layer is not required, the manufacturing process is simplified, and the entire apparatus can be thinned.
In addition, by adopting the wire grid type polarizing element, the polarizing plate attaching step becomes unnecessary, the manufacturing process is simplified, and the entire apparatus can be thinned.

As described above (II), the optical characteristics can be improved by eliminating the use of both the shield layer and the protective layer as described above. When a polarizing plate is disposed between the first substrate and the second substrate, the polarized light transmitted through the polarizing plate does not pass through the first substrate and the second substrate until reaching the next polarizing plate. Can be prevented. Since the efficiency of transmission and shielding by the liquid crystal drive unit is increased, the luminance and contrast ratio can be improved as a result.

FIG. 6 is a conceptual diagram of an electromagnetic wave shield in the liquid crystal display device of the first embodiment.
As shown in FIG. 6, the liquid crystal display device of the present embodiment displays the second substrate 5 and the position detection conductive layer 2 (the position detection conductive layer 2 is displayed from the second substrate 5 from the display surface side. A wire grid polarizer (front) 14, a liquid crystal drive unit 10, a wire grid polarizer (back) 15, and a first substrate 11. The liquid crystal drive unit 10 includes, for example, a common electrode 7, a liquid crystal layer 8, a TFT drive circuit 9, and an insulating layer 13. As shown in FIG. 6, conduction 25 is performed outside the display area 21. By adopting such a configuration, electromagnetic wave noise radiated from the liquid crystal drive unit 10 to the outside is reduced. Further, the shielding effect can be further enhanced by connecting the wire grid polarizer (front) 14 and the wire grid polarizer (back) 15 to each other and grounding.

In this embodiment, the influence of the electromagnetic wave noise can be sufficiently reduced by the electromagnetic wave shielding mechanism of the wire grid polarizer (front) 14 and the wire grid polarizer (back) 15 as described above. Therefore, in this embodiment, in order to avoid the influence of electromagnetic wave noise caused by the drive signal from the liquid crystal driving device unit 10, it is not necessary to secure a sufficient distance between the position detecting conductive layer 2 and the liquid crystal driving device unit 10, It is possible to omit the touch panel substrate 3 (see FIG. 14) which is conventionally provided in addition to the second substrate 5.

(Embodiment 2)
FIG. 7 is a schematic cross-sectional view of the liquid crystal display device according to the second embodiment.
As shown in FIG. 7, from the display surface side, the second substrate 5, the position detecting conductive layer 2, the color filter 6, the wire grid polarizer (table) 14, the insulating layer 13, the common electrode 7, the liquid crystal layer 8, The liquid crystal display device includes a TFT drive circuit 9, an insulating layer 13, a wire grid polarizer (back) 15, and a first substrate 11. Other than that, it is the same as in the first embodiment, and the wire grid polarizer (front) 14 and the wire grid polarizer (back) 15 are electrically connected at the outer edge of the display area, and they are ground (GND). Is grounded. Note that the voltage may be held at a constant voltage.

In the second embodiment, similarly to the first embodiment, the two wire grid polarizers 14 and 15 are electrically connected via the conductive material 18 in the non-display region of the liquid crystal display device.

In the present embodiment, the following effects are exhibited in addition to the effects obtained in the first embodiment.
The color filter 6 is disposed outside the polarizing plate (on the display surface side of the wire grid polarizer (table) 14). The polarized light does not pass through the color filter 6 until it reaches the next polarizing plate, and a decrease in the degree of polarization can be prevented. Since the efficiency of transmission and shielding by the liquid crystal driving device is increased, the luminance and contrast ratio can be improved as a result.

(Embodiment 3)
FIG. 8 is a schematic cross-sectional view of the liquid crystal display device of the third embodiment.
As shown in FIG. 8, the position detection conductive layer 2 is disposed on the side opposite to the display surface side of the second substrate 5, the protective layer 1 is added on the position detection conductive layer 2, and the position detection conductive layer is added. This embodiment is the same as Embodiment 1 except that the insulating layer 13 disposed between the layer 2 and the wire grid polarizer (table) 14 is not used. In the third embodiment, as in the first embodiment, the two wire grid polarizers 14 and 15 are electrically connected via the conductive material 18 in the non-display region of the liquid crystal display device.
Thereby, the effect similar to Embodiment 1 mentioned above is exhibited.

FIG. 9 is a cross-sectional view of the liquid crystal display device according to the third embodiment.
The liquid crystal display device of the present embodiment includes the respective members in the order described above from the display surface side. As shown in FIG. 9, the wire grid polarizer (front) 14 and the wire grid polarizer (back). 15 is electrically connected to the outer edge of the display area through the conductive material 19.

(Embodiment 4)
FIG. 10 is a schematic cross-sectional view of the liquid crystal display device according to the fourth embodiment.
As shown in FIG. 10, the second embodiment is the same as the second embodiment except that the position detection conductive layer 2 is arranged on the display surface side of the second substrate 5 and the protective layer 1 is added on the position detection conductive layer 2. is there. In the fourth embodiment, as in the first embodiment, the two wire grid polarizers 14 and 15 are electrically connected via the conductive material 18 in the non-display region of the liquid crystal display device.
Thereby, the effect similar to Embodiment 1 mentioned above is exhibited.

The form in which the two wire grid polarizers 14 and 15 are electrically connected via the conductive material 18 in the non-display region of the liquid crystal display device described above is the same as that of the first to fourth embodiments. The present invention can be suitably applied in a form in which the wire grid polarizers 14 and 15 are disposed between the two substrates 5.

(Embodiment 5)
FIG. 11 is a schematic cross-sectional view of the liquid crystal display device of the fifth embodiment.
As shown in FIG. 11, each member is arranged such that a wire grid polarizer (front) 14 is arranged on the display surface side with respect to the second substrate 5, and the wire grid polarizer (back) 15 is placed on the first substrate. 11 is the same as that of the third embodiment except that the insulating layer 13 disposed on the opposite side of the display surface side from the TFT driving circuit 9 and the wire grid polarizer (back) 15 is not used. It is.
FIG. 12 is a schematic diagram of the display surface of the liquid crystal display device according to the fifth embodiment viewed in plan.
FIG. 13 is a cross-sectional view of the liquid crystal display device of the fifth embodiment.
In the fifth embodiment, both of the two wire grid polarizers 14 and 15 are arranged on the opposite side of the region where the first substrate 11 and the second substrate 5 face each other. In this case, the conductive material 18 that extends to the outside of the liquid crystal display device connected to the wire grid polarizer (front) 14 and the wire grid polarizer (back) 15 by ACF (anisotropic conductive film) or solder. A mode in which conduction is established through the pin is preferable. In addition, as long as one of the two wire grid polarizers 14 and 15 is disposed on the opposite side of the region where the first substrate 11 and the second substrate 5 are opposed to each other, the liquid crystal display device described above can be used. A form in which the conductive material 18 is disposed outside and the two wire grid polarizers 14 and 15 are electrically connected can be suitably applied.
Thereby, the effect similar to Embodiment 1 mentioned above is exhibited.
Embodiments 1 to 5 described above may be combined as appropriate within a range not departing from the gist of the present invention.

1: Protective layer 2: Position detection conductive layer 3: Touch panel substrate 4: Iodine polarizing plate (table)
5: Second substrate 6: Color filter 7: Common electrode 8: Liquid crystal layer 9: TFT drive circuit 10: Liquid crystal drive unit 11: First substrate 12: Iodine polarizing plate (back)
13: Insulating layer 14: Wire grid polarizer (table)
15: Wire grid polarizer (back)
16, 124m, 124p: Metal thin wire portion 17, 124s: Metal thin wire conducting portion 18, 19: Conductive material 18a: Spot-like conductive material 18b: Linear conductive material 20: Sealing material 21: Display region 25 : Conduction outside the display area 41: gate driver IC
43: Source driver IC
45: Flexible printed circuit 47: Drive circuit side 51: ACF (anisotropic conductive film) or solder

Claims (7)

A liquid crystal display device comprising a first substrate, a liquid crystal layer, a second substrate and a circuit member,
The liquid crystal display device further includes a wire grid polarizer,
The liquid crystal display device, wherein the wire grid polarizer is grounded or held at a constant voltage. The wire grid polarizer includes a front polarizing plate and a back polarizing plate,
The liquid crystal layer is sandwiched between the front polarizing plate and the back polarizing plate, and an electric conduction path is formed so that the front polarizing plate and the back polarizing plate are electrically connected. The liquid crystal display device according to claim 1. The liquid crystal display device according to claim 2, wherein the electrical conduction path is formed to short-circuit the outer edge portion of the front polarizing plate and the outer edge portion of the back polarizing plate. In the liquid crystal display device, a back polarizing plate is disposed between the first substrate and the liquid crystal layer, and a front polarizing plate is disposed between the liquid crystal layer and the second substrate. The liquid crystal display device according to claim 1. The liquid crystal display device according to claim 1, wherein the circuit member is a position detection conductive layer provided on a touch panel. 6. The liquid crystal display device according to claim 5, wherein the position detection conductive layer is disposed between the liquid crystal layer and the second substrate. The liquid crystal display device according to claim 2, wherein a color filter is disposed on the display surface side of the front polarizing plate.

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