JP2003302622A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To interrupt a high frequency electromagnetic field from a cold cathode fluorescent lamp without adding a special member such as an interrupting sheet, in a liquid crystal display device. <P>SOLUTION: The liquid crystal display device has a side light type backlight provided with a light guide plate GLB laminated on the rear of a liquid crystal panel PNL via optical sheets OPS. Conductivity is imparted to the surface of a polarizing plate POL1 provided on the backlight side of the liquid crystal panel PNL to impart a shielding function to the surface and a conductive tacky adhesive tape CTP is provided, one end of which is tackily stuck to the end edge of the conductive part of the polarizing plate POL1 and the other end of which comes in contact with at least the inner wall of an upper frame SHD so as to be conductively connected with the wall. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device having a so-called sidelight type backlight in which a light guide plate having a light source on a side edge is laminated on a back surface of a liquid crystal panel.

[0002]

2. Description of the Related Art Liquid crystal display devices are widely used as light-weight and low power consumption display devices. The liquid crystal display device is composed of a liquid crystal panel in which liquid crystal is sandwiched between two insulating substrates, which are preferably transparent substrates such as glass. The liquid crystal panel has an electrode or a switching element for pixel selection on the inner surface of one or both of the insulating substrates, forms an electronic latent image on the selected pixel, and illuminates it from the back or surface. This is what makes it visible.

In particular, a personal computer, a display monitor, and the like, which are provided with a light source on the back surface (first main surface) of a liquid crystal panel, are often used. Such a back-mounted light source is called a backlight, and is called a direct light type that directly illuminates the liquid crystal panel with light from a plurality of light sources installed on the back surface of the liquid crystal panel, and is called a light guide plate such as an acrylic plate. A so-called side light type is known in which a transparent plate is laminated on the back surface of a liquid crystal panel, and light from a light source installed on the side edge thereof is directed to the liquid crystal panel direction while illuminating while propagating to the light guide plate.

[0004]

A cold cathode fluorescent lamp, which is a linear light source, is mainly used as a light source for the above-mentioned backlight. Since the cold cathode fluorescent lamp is lit by a high frequency current, the cold cathode fluorescent lamp is used. The high-frequency electromagnetic field leaking from the liquid crystal interferes with the display signal of the liquid crystal panel and causes display noise. As a countermeasure against this, conventionally, a lamp reflector for reflecting the light of the cold cathode fluorescent lamp to the light guide plate side is made of metal, or a conductive material such as copper tape is attached to cover the periphery of the cold cathode fluorescent lamp. Has been done.

In addition, a conductive sheet is interposed between the liquid crystal panel and the backlight (Japanese Patent Laid-Open No. 10-24405).
4), JP-A-7-326224, JP-A-6-
-160804), JP-A-5-264991, JP-A-5-114795).

However, in any of the above-mentioned prior art configurations, since a member for electromagnetic shielding is additionally provided, the structure becomes complicated, the assemblability deteriorates, and the cost increases,
Further, particularly in a sidelight type liquid crystal display device, reduction in weight and thickness is hindered. An object of the present invention is to provide a sidelight type liquid crystal display device which is thin, lightweight and low cost by blocking a high frequency electromagnetic field from a cold cathode fluorescent lamp without using a special member separately. To do.

[0007]

A polarizing plate is laminated on each of a first main surface (backlight side) and a second main surface (display surface side) of a liquid crystal panel constituting a liquid crystal display device.
In a sidelight type liquid crystal display device, a light guide plate that constitutes a backlight is installed on the first main surface side (rear surface) of the liquid crystal panel, and is composed of a laminated body of a diffusion sheet and a prism sheet between the liquid crystal panel and the light guide plate. Optical sheets are inserted.

The diffusion sheet is usually provided on the side facing the first main surface of the liquid crystal panel, and 1 or 2 is provided below it (on the side of the light guide plate).
A number of prism sheets are laminated. Depending on the product, a diffusion sheet may be further provided below the prism sheet at a position facing the light guide plate.

Usually, a sidelight type liquid crystal display device is
An upper frame made of metal in which a frame having a window exposing an effective display area of the second main surface (display surface) of the liquid crystal panel is formed to accommodate the liquid crystal panel and a side wall of the frame is bent in the backlight direction. have. A slight gap is usually provided between the edge of the liquid crystal panel and the inner walls of the upper frame and the lower frame such that they are easy to assemble and the two do not abut each other when the product is manufactured. In the present invention, the conductive adhesive tape can be installed by utilizing such existing gap.

In order to achieve the above-mentioned object, the present invention provides a side light type liquid crystal display device having a light guide plate laminated on the back surface of a liquid crystal panel with optical sheets interposed between the liquid crystal panel and the light guide plate side. Provided polarizing plate, that is, imparting conductivity to the surface of the polarizing plate facing the optical sheets to have a shielding function, and sticking one end of the conductive adhesive tape to the conductive edge of this polarizing plate, The other end of this conductive adhesive tape was brought into contact with at least the upper frame (for example, the inner wall thereof) to electrically connect the polarizing plate and the upper frame. As the conductive pressure-sensitive adhesive tape, for example, a tape obtained by coating a copper foil with a pressure-sensitive adhesive or a tape coated with a conductive pressure-sensitive adhesive is used.

Further, according to the present invention, the surface of the optical sheet facing the first polarizing plate of the liquid crystal panel (the surface of the diffusion sheet) is made conductive, and one end is adhered to the edge of the diffusion sheet, A conductive adhesive tape was provided so that the other end was in contact with, for example, the inner wall of the upper frame and was electrically connected.

Further, according to the present invention, the diffusion sheet facing the first polarizing plate of the liquid crystal panel is made to have conductivity, and at least a part of the edge thereof is extended to the side wall of the lower frame or to be rolled up. And the extended portion was adhered to the lower frame with a conductive adhesive tape.

Further, in the case where the inner wall of the upper frame is coated with an insulating film to prevent a short circuit with the wiring of the drive circuit or the like, the above-mentioned conductive tape is extended to the back surface of the lower frame, Is connected to a suitable metal member.

With the above-mentioned structure, it is possible to prevent display noise generated by the high frequency electric field from the cold cathode fluorescent lamp leaking to the liquid crystal panel side and affecting the display, and to reduce the thickness, weight and cost. It is possible to provide a sidelight type liquid crystal display device capable of displaying high-quality images at low cost without obstruction.

It is needless to say that the present invention is not limited to the above-mentioned configuration and the configuration of the embodiment described later, and various modifications can be made without departing from the technical idea of the present invention.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described in detail with reference to the drawings of the embodiments. FIG. 1 is a cross-sectional view of an essential part for schematically explaining a configuration example of a sidelight type liquid crystal display device according to the present invention. 2 is a cross-sectional view schematically illustrating a configuration example of the liquid crystal panel in FIG.
FIG. 3 is a cross-sectional view schematically illustrating a configuration example of the optical sheets in FIG. In the figure, reference numeral PNL is a liquid crystal panel, a liquid crystal LC is sandwiched between a first substrate SUB1 and a second substrate SUB2 made of glass plates, and a first polarizing plate POL1 is provided on a first main surface (backlight side). The second polarizing plate POL2 is laminated on the second main surface (display surface side).

Reference numeral OPS is an optical sheet, GLB is a light guide plate, CFL is a cold cathode fluorescent lamp, MDL is a lower frame (here, resin mold), RFS is a reflection sheet,
LFS is a lamp reflection sheet, and SHD is a metal upper frame. A white resin film or the like is used for the reflection sheet RFS. Further, although the reflection sheet RFS is extended and bent from the back surface to the top surface of the cold cathode fluorescent lamp CFL to form the lamp reflection sheet, there is a member different from the reflection sheet RFS.

Further, the upper frame SHD is made of an iron-based metal plate, and a display window exposing the effective display area of the liquid crystal panel PNL is formed in the main part thereof to have a frame around the frame, and the side wall of this frame is It extends in the direction of the lower frame and is engaged and fixed to the lower frame by a known means. Reference numeral L shown by a dotted line in the drawing is a path of light from the cold cathode fluorescent lamp CFL that illuminates the periphery of the effective display area AR of the liquid crystal panel PNL.

As shown in FIG. 3, the optical sheets OPS include a first diffusion sheet DF1, a first prism sheet PRZ1, a second prism sheet PRZ2, and a second diffusion sheet DF2 from the light guide plate GLB side constituting the backlight. Is a laminated body in which Here, two diffusion sheets are used, but there may be one in which only the second diffusion sheet DF2 is used and one in which only one prism sheet is used.

FIG. 4 is a sectional view of an essential part for schematically explaining the constitution of the first embodiment of the sidelight type liquid crystal display device according to the present invention. The same reference numerals as those in FIGS. 1 to 3 correspond to the same functional parts. FIG. 4 shows a cross section of a side adjacent to the side where the cold cathode fluorescent lamp of the liquid crystal display device is installed. In this embodiment, a transparent conductive film EC such as ITO is formed on the surface of the first polarizing plate POL1 of the liquid crystal panel PNL to give conductivity. One end of the conductive adhesive tape CTP is adhered to the surface of the first polarizing plate POL1 on which the transparent conductive film EC is formed, and the other end is pulled out toward the inner wall of the upper frame SHD so that the surface portion indicated by reference numeral C is electrically connected. Connected to each other. The transparent conductive film EC
An electrical connection between the conductive adhesive tape CTP and the conductive adhesive tape CTP is indicated by reference symbol B. In this case, there is no insulating film on the inner wall of the upper frame SHD.

The tip of one end of the conductive adhesive tape CTP is located at a position indicated by reference symbol A, which is retracted from the effective display area AR of the liquid crystal panel PNL, and the illumination light from the light guide plate GLB constituting the backlight is emitted from the liquid crystal panel. The display is not affected.

With this configuration, the transparent conductive film EC provided on the first polarizing plate POL1 is connected to the ground at the upper frame SHD via the conductive adhesive tape CTP, and the liquid crystal panel PNL.
Is shielded from the high frequency electromagnetic field from the cold cathode fluorescent lamp described above. Therefore, generation of display noise due to this high-frequency electromagnetic field is prevented, and high-quality image display is obtained.
At the same time, since no special member other than the conductive adhesive tape CTP is required to block the high frequency electromagnetic field, it is possible to obtain a low-cost liquid crystal display device without impeding thinning and weight reduction.

FIG. 5 is a sectional view of an essential part for schematically explaining the constitution of the second embodiment of the sidelight type liquid crystal display device according to the present invention. The same reference numerals as those in FIGS. 1 to 4 correspond to the same functional parts. FIG. 5 also shows a cross section of a side adjacent to the side where the cold cathode fluorescent lamp of the liquid crystal display device is installed. In this embodiment, a transparent conductive film EC such as ITO is formed on the surface of the diffusion sheet DF2 facing the liquid crystal panel PNL that constitutes the optical sheets POS.
To give conductivity. This transparent conductive film EC
One end of the conductive adhesive tape CTP is adhered to the surface of the diffusion sheet DF2 on which the film is formed, and the other end is pulled out onto the side wall of the lower frame MDL.

Transparent conductive film EC and conductive adhesive tape CTP
The no electrical connection is designated by the reference symbol D. The other end of the pulled-out conductive adhesive tape CTP has an upper frame S as in FIG.
It is electrically connected to the HD. Conductive adhesive tape C
The tip of one end of TP is at the same position as in FIG. 4 so that the illumination light from the light guide plate GLB forming the backlight does not affect the display of the liquid crystal panel.

With this configuration, the transparent conductive film EC provided on the diffusion sheet DF2 is connected to the ground at the upper frame SHD via the conductive adhesive tape CTP, and the liquid crystal panel PNL is protected from the high frequency electromagnetic field from the cold cathode fluorescent lamp described above. Shielded. Therefore, generation of display noise due to this high-frequency electromagnetic field is prevented, and high-quality image display is obtained. At the same time, since no special member other than the conductive adhesive tape CTP is required to block the high frequency electromagnetic field, it is possible to obtain a low-cost liquid crystal display device without impeding thinning and weight reduction.

FIG. 6 is a sectional view of an essential part for schematically explaining the constitution of a third embodiment of the sidelight type liquid crystal display device according to the present invention. The same reference numerals as those in FIGS. 1 to 5 correspond to the same functional parts. Illustration of the light guide plate and the like is omitted. FIG. 6 also shows a cross section of a side adjacent to the side where the cold cathode fluorescent lamp of the liquid crystal display device is installed. In this embodiment, optical sheets POS
I on the surface of the diffusion sheet DF2 constituting the
A transparent conductive film EC such as TO is formed to give conductivity.

The diffusion sheet DF2 having the transparent conductive film EC formed thereon is extended to the upper portion of the side wall of the lower frame MDL,
The conductive adhesive tape CTP adheres to the upper portion of the side wall of the lower frame MDL. The conductive adhesive tape CTP is pulled out to the back surface by wrapping the side wall of the lower frame MDL. The electrical connection between the conductive adhesive tape CTP and the transparent conductive film EC of the diffusion sheet DF2 is indicated by reference numeral D. The electrical connection between the conductive adhesive tape CTP and the inner wall of the upper frame SHD is indicated by reference numeral E.

The tip of one end of the conductive adhesive tape CTP is at the same position as in FIG. 4 so that the illumination light from the light guide plate GLB forming the backlight does not affect the display of the liquid crystal panel. .

With this configuration, the transparent conductive film EC provided on the diffusion sheet DF2 is connected to the ground at the upper frame SHD via the conductive adhesive tape CTP, and the liquid crystal panel PNL is protected from the high frequency electromagnetic field from the cold cathode fluorescent lamp described above. Shielded. Therefore, generation of display noise due to this high-frequency electromagnetic field is prevented, and high-quality image display is obtained. At the same time, since no special member other than the conductive adhesive tape CTP is required to block the high frequency electromagnetic field, it is possible to obtain a low-cost liquid crystal display device without impeding thinning and weight reduction.

FIG. 7 is a sectional view of an essential part for schematically explaining the constitution of the fourth embodiment of the sidelight type liquid crystal display device according to the present invention. The same reference numerals as those in FIGS. 1 to 6 correspond to the same functional parts. Illustration of the light guide plate and the like is omitted. FIG. 7 also shows a cross section of a side adjacent to the side where the cold cathode fluorescent lamp of the liquid crystal display device is installed. In this embodiment, optical sheets POS
A transparent conductive film EC of ITO or the like is formed on the surface of the diffusion sheet DF2 constituting the prism sheet side, to impart conductivity.

The diffusion sheet DF2 having the transparent conductive film EC formed thereon is extended to the upper portion of the side wall of the lower frame MDL,
The conductive adhesive tape CTP is overlaid on the side wall of the lower frame MDL. Then, in the assembly process in which the upper frame SHD is engaged with the lower frame MDL by inserting the spacer SPC between the extended portion and the upper frame SHD, the transparent conductive film EC of the diffusion sheet DF2 is formed.
The conductive adhesive tape CTP and the conductive adhesive tape CTP are electrically connected to each other at a surface portion indicated by reference numeral F.

The conductive adhesive tape CTP is the lower frame MD
The side wall of L is rolled in and pulled out to the back. This embodiment shows a case where the insulating layer CPM is applied to the inner wall of the upper frame SHD. Therefore, the conductive adhesive tape C
The TP is not directly electrically connected to the inner wall of the upper frame SHD as in the case of FIG. 6, but is connected to the ground through another metal member (not shown). When the insulating layer CPM is not applied to the inner wall of the upper frame SHD, it is connected to the inner wall of the upper frame SHD with the same configuration as in FIG. At this time, if the spacer SPC is made of a conductor, more reliable electrical connection can be obtained.

The tip of one end of the conductive adhesive tape CTP is at the same position as in FIG. 4 so that the illumination light from the light guide plate GLB forming the backlight does not affect the display of the liquid crystal panel. .

With this configuration, the transparent conductive film EC provided on the diffusion sheet DF2 is connected to the ground via the conductive adhesive tape CTP, and the liquid crystal panel PNL is shielded from the high frequency electromagnetic field from the cold cathode fluorescent lamp described above. Therefore, generation of display noise due to this high-frequency electromagnetic field is prevented, and high-quality image display is obtained. At the same time, since no special member other than the conductive adhesive tape CTP is required to block the high frequency electromagnetic field, it is possible to obtain a low-cost liquid crystal display device without impeding thinning and weight reduction.

FIG. 8 is a sectional view of an essential part for schematically explaining the constitution of the fifth embodiment of the sidelight type liquid crystal display device according to the present invention. The same reference numerals as those in FIGS. 1 to 7 correspond to the same functional parts. Illustration of the light guide plate and the like is omitted. FIG. 8 also shows a cross section of a side adjacent to the side where the cold cathode fluorescent lamp of the liquid crystal display device is installed. In this embodiment, optical sheets POS
I on the surface of the diffusion sheet DF2 constituting the
A transparent conductive film EC such as TO is formed to give conductivity.

The diffusion sheet DF2 having the transparent conductive film EC formed thereon extends from the upper portion of the side wall of the lower frame MDL to the lower portion (rear surface) thereof as indicated by a reference symbol G. Then, the end of the extending portion of the diffusion sheet DF2 is fixed to the lower frame MDL with the conductive adhesive tape CPT. The transparent conductive film EC of the diffusion sheet DF2 is grounded via the conductive adhesive tape CTP. The upper frame SH
It is also possible to use a spacer similar to that shown in FIG. With this configuration, the same effect as that of the above-described embodiment can be obtained, but the following configuration can be added.

FIG. 9 is a plan view for explaining a modified example of the diffusion sheet in FIG. 8 for schematically explaining the constitution of the sixth embodiment of the sidelight type liquid crystal display device according to the present invention. The diffusion sheet DF2 of this embodiment has a black print film BD formed on the portion of reference numeral H in FIG. The tip of the reference numeral H for printing the black print film BD is at the edge of the effective display area AR in FIG. 8 and at a position slightly retracted from this edge. By printing this black print film BD, it is possible to block light leakage from the edge of the effective display area AR.

FIG. 10 is a schematic view for explaining the constitution of the seventh embodiment of the sidelight type liquid crystal display device according to the present invention.
FIG. 9 is a plan view illustrating another modified example of the diffusion sheet in FIG. In the diffusion sheet DF2 of this embodiment, the portion indicated by reference numeral H in FIG. 9 is a tongue-shaped protrusion TG.
Therefore, the conductive adhesive tape CTP of FIG. 8 is adhered to this tongue-shaped protrusion TG. Although two tongue-shaped protrusions TG are shown, one or three or more tongue-shaped protrusions TG may be provided, and their positions are also arbitrary.

With this structure as well, the transparent conductive film EC provided on the diffusion sheet DF2 is connected to the ground via the conductive adhesive tape CTP, and the liquid crystal panel PNL is shielded from the high frequency electromagnetic field from the cold cathode fluorescent lamp described above. . Therefore, generation of display noise due to this high-frequency electromagnetic field is prevented, and high-quality image display is obtained. At the same time, since no special member other than the conductive adhesive tape CTP is required to block the high frequency electromagnetic field, it is possible to obtain a low-cost liquid crystal display device without impeding thinning and weight reduction. In addition, light leakage from the edge of the effective display area is blocked.

The above-described embodiments can be combined with each other depending on the configurations and shapes of the upper and lower frames and other design conditions.

FIG. 11 is a developed perspective view for explaining an example of the whole constitution of the liquid crystal display device of the present invention. Liquid crystal panel PNL
As described in the above embodiment, the liquid crystal is sandwiched between the two insulating substrates, and polarizing plates are laminated on both main surfaces. A drive circuit chip is mounted on the one side and the other side adjacent to the one side. Liquid crystal panel PN
The optical sheets OPS installed on the back surface of L are a laminated body including a first diffusion sheet DF1, a first prism PRZ1, a second prism PRZ2, and a second diffusion sheet DF2 in this order from the side farther from the liquid crystal panel PNL.

A light guide plate GLB is installed on the back side of the optical sheets OPS. The cold cathode fluorescent lamp CFL is provided along the side edge of the light guide plate GLB, and constitutes a so-called side edge type backlight. The cold cathode fluorescent lamp CFL is connected to a high frequency power source (inverter) provided outside via a cable CB and a connector CT. Reference numeral BS is a rubber bush for holding both ends of the cold cathode fluorescent lamp CFL. A reflection sheet RFS is provided on the back surface of the light guide plate GLB.

The liquid crystal panel PNL, the optical sheets OPS, the light guide plate GLB constituting the backlight, and the reflection sheet RFS described above are stacked in the illustrated arrangement, sandwiched between the upper frame SHD and the lower frame MDL, and at the edges of both frames. It is fixed by a locking mechanism such as a claw and a claw receiver.

A conductive film is formed on the surface of the first polarizing plate included in the liquid crystal panel PNL or the second diffusion sheet DF2 constituting the optical sheet OPS, and this conductive film and the upper frame SHD or another surface. The metal member is electrically connected by any of the configurations described in the above embodiments. With this configuration, the liquid crystal panel PNL is shielded from the high frequency electromagnetic field leaking from the cold cathode fluorescent lamp CFL, and the generation of display noise due to the high frequency electromagnetic field is prevented. The conductive adhesive tape is not shown in FIG.

It is not excluded to appropriately combine the sheet to which conductivity is imparted, the conductive adhesive tape, and the snow image structure of the upper frame or the lower frame in each of the above-described embodiments. The present invention is characterized in that it shields the high frequency electromagnetic field from the cold cathode fluorescent lamp without adding a special sheet or the like. Therefore, it is not limited to the conductive adhesive tape in the above-mentioned embodiment, and fixing of the polarizing plate or the diffusion plate to which the conductivity is imparted by using the conductive tape and the adhesive and the upper frame or the lower frame etc. can be performed. Belong to the technical scope. Further, similarly, it is possible to adopt a structure in which the conductive tape can be electrically connected without a pressure-sensitive adhesive, for example, by a pressure contact structure between the laminated materials.

[0046]

As described above, according to the present invention,
It is possible to prevent display noise that occurs when a high-frequency electromagnetic field from the cold cathode fluorescent lamp that constitutes the sidelight type backlight leaks to the liquid crystal panel side and affects the display,
It is possible to provide a liquid crystal display device capable of displaying high-quality images at low cost without impeding thinning, weight reduction, and cost reduction.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part for schematically explaining a configuration example of a sidelight type liquid crystal display device according to the present invention.

FIG. 2 is a cross-sectional view schematically illustrating a configuration example of the liquid crystal panel in FIG.

FIG. 3 is a cross-sectional view schematically illustrating a configuration example of optical sheets in FIG.

FIG. 4 is a cross-sectional view of relevant parts for schematically explaining the configuration of a first embodiment of a sidelight type liquid crystal display device according to the present invention.

FIG. 5 is a cross-sectional view of relevant parts for schematically explaining the configuration of a second embodiment of the sidelight type liquid crystal display device according to the present invention.

FIG. 6 is a cross-sectional view of relevant parts for schematically explaining the configuration of a third embodiment of the sidelight type liquid crystal display device according to the present invention.

FIG. 7 is a cross-sectional view of main parts for schematically explaining the configuration of a fourth embodiment of the sidelight type liquid crystal display device according to the present invention.

FIG. 8 is a cross-sectional view of relevant parts for schematically explaining the configuration of a fifth embodiment of the sidelight type liquid crystal display device according to the present invention.

FIG. 9 is a plan view illustrating a modified example of the diffusion sheet in FIG. 8 for schematically explaining the configuration of the sixth embodiment of the sidelight type liquid crystal display device according to the present invention.

FIG. 10 is a plan view illustrating another modification of the diffusion sheet in FIG. 8 for schematically explaining the configuration of the seventh embodiment of the sidelight type liquid crystal display device according to the present invention.

FIG. 11 is a developed perspective view illustrating an example of the overall configuration of the liquid crystal display device of the present invention.

[Explanation of symbols]

PNL ... Liquid crystal panel, SUB1 ... First substrate, SUB2 ... Second substrate, LC ... Liquid crystal, P
OL1 ... The first polarizing plate is POL2 ... The second polarizing plate, OPS ... Optical sheets, GLB ... The light guide plate, CFL ... The cold cathode fluorescent lamp, MDL.・ ・
・ Lower frame, RFS ... ・ Reflective sheet, LFS ...
..Lamp reflection sheet, SHD, ... Upper frame, A
R ... Effective display area, DF1, ... First diffusion sheet, DF2 ... Second diffusion sheet, PRZ1 ...
First prism sheet, PRZ2 ... Second prism sheet CTP ... Conductive adhesive tape.

Claims (8)

[Claims] 1. A liquid crystal panel in which a first polarizing plate and a second polarizing plate are respectively laminated on a first main surface and a second main surface, a light guide plate constituting a sidelight type backlight, and a first liquid crystal panel. An optical sheet laminated body interposed between a polarizing plate and the light guide plate, and a frame having a window exposing an effective display area of the second main surface of the liquid crystal panel are formed to accommodate the liquid crystal panel and the frame. A liquid crystal display device comprising: a metal upper frame whose side wall is bent in the direction of the backlight; and a lower frame which has a side wall for housing the backlight and engages with the side wall tip portion of the upper frame. At least the surface of the first polarizing plate on the side of the optical sheet laminate has conductivity, and the surface retreating from the effective display area of the liquid crystal panel on the side of the optical sheet laminate having the conductivity. A liquid crystal display device comprising a conductive tape, one end of which is adhered to the table and the other end of which is in contact with the upper frame. 2. The conductivity of at least the surface of the first polarizing plate on the side of the optical sheet laminate is a thin film formed by forming a transparent conductive film, and the conductive tape is a conductor coated with an adhesive. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is a liquid crystal display device. 3. A liquid crystal panel in which a first polarizing plate and a second polarizing plate are respectively laminated on a first main surface and a second main surface, a light guide plate forming a sidelight type backlight, and a first liquid crystal panel. An optical sheet laminated body interposed between a polarizing plate and the light guide plate, and a frame having a window exposing an effective display area of the second main surface of the liquid crystal panel are formed to accommodate the liquid crystal panel and the frame. A liquid crystal display device comprising: a metal upper frame whose side wall is bent in the direction of the backlight; and a lower frame which has a side wall for housing the backlight and engages with the side wall tip portion of the upper frame. Wherein the optical sheets include a diffusion sheet facing the first polarizing plate and a prism sheet laminated in the backlight direction of the diffusion sheet, and the first polarization of the diffusion sheet. A conductive tape having a surface opposite to that of the conductive sheet, one end of which adheres to a position of the diffusion sheet having the conductivity set back from the effective display area of the liquid crystal panel and the other end of which is in contact with the inner surface of the upper frame. A liquid crystal display device comprising: 4. A liquid crystal panel in which a first polarizing plate and a second polarizing plate are respectively laminated on a first main surface and a second main surface, a light guide plate forming a sidelight type backlight, and a first liquid crystal panel. An optical sheet laminated body interposed between a polarizing plate and the light guide plate, and a frame having a window exposing an effective display area of the second main surface of the liquid crystal panel are formed to accommodate the liquid crystal panel and the frame. A liquid crystal display device comprising: a metal upper frame whose side wall is bent in the direction of the backlight; and a lower frame which has a side wall for housing the backlight and engages with the side wall tip portion of the upper frame. The optical sheets include a diffusion sheet facing the first polarizing plate and a prism sheet laminated in the backlight direction of the diffusion sheet, wherein the prisms of the diffusion sheet are provided. The surface facing the sheet has conductivity, and at least part of the edge extends to the side wall of the lower frame, and the conductive at least part of the extended diffusion sheet and the upper frame. A liquid crystal display device, characterized in that a conductive adhesive tape is provided between the inner walls of the liquid crystal display device. 5. A liquid crystal panel in which a first polarizing plate and a second polarizing plate are respectively laminated on a first main surface and a second main surface, a light guide plate constituting a sidelight type backlight, and a first liquid crystal panel. An optical sheet laminated body interposed between a polarizing plate and the light guide plate, and a frame having a window exposing an effective display area of the second main surface of the liquid crystal panel are formed to accommodate the liquid crystal panel and the frame. A liquid crystal display device comprising: a metal upper frame whose side wall is bent in the direction of the backlight; and a lower frame which has a side wall for housing the backlight and engages with the side wall tip portion of the upper frame. Wherein the optical sheets include a diffusion sheet facing the first polarizing plate and a prism sheet laminated in the backlight direction of the diffusion sheet, and the first polarization of the diffusion sheet. The surface opposite to has conductivity, and at least a part of the edge extends to the bottom of the lower frame by wrapping the side wall of the lower frame, and the extended end of the extended diffusion sheet. A liquid crystal display device comprising a conductive adhesive tape which is fixed to the lower frame by adhesive and is interposed between inner walls of the upper frame. 6. The conductive material on the surface of the optical sheet laminate is a thin film having a transparent conductive film formed thereon, and the conductive tape is a copper foil coated with an adhesive. 5. The liquid crystal display device according to any one of 5. 7. The liquid crystal display device according to claim 1, wherein the lower frame is a resin-molded frame body. 8. The liquid crystal display device according to claim 1, further comprising an insulating film on an inner surface of the upper frame.