JP2006330230A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device, wherein the manufacturing cost is reduced by constituting so that a configuration for removing static electricity on an observer-side surface of a liquid crystal panel, is simplified to have less restrictions and can be given without requiring new equipment in a manufacturing process. <P>SOLUTION: A pair of liquid crystal panel reception parts 31 are provided at each of two corners of a lower side of a liquid crystal panel 1. Each liquid crystal panel reception part 31 is an L-shaped member, wherein a second flat part 31b of two flat parts is abutted on a side face of the liquid crystal panel 1. A conductive sheet 5 with an adhesive is stuck to each of two corners of the lower side of the liquid crystal panel 1 from on the corner of the liquid crystal panel 1 to a principal face of a resin case 3 and a side face of a metallic rear case 4 having the resin case 3 stored therein. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device, and more particularly to a horizontal electric field type liquid crystal display device.

  Generally, in a liquid crystal display device, a glass substrate (hereinafter referred to as “TFT side glass substrate”) on which a thin film transistor (TFT) is formed, and a glass substrate on which a color filter is disposed (hereinafter referred to as “color filter side glass substrate”). The liquid crystal is sealed between them to form a liquid crystal panel.

  In a horizontal electric field type liquid crystal display device, a pixel electrode and a counter electrode are arranged side by side only on the TFT side glass substrate, and liquid crystal molecules are formed by a horizontal electric field (direction parallel to the substrate surface) generated between the two electrodes. The configuration is such that the direction of liquid crystal molecules is controlled by applying an electric field from the lateral direction.

  Therefore, when electric charges are accumulated on the TFT side glass substrate or the color filter side glass substrate and an electric field is generated in the vertical direction (direction perpendicular to the substrate surface), the direction control of the liquid crystal molecules is disturbed and display unevenness occurs.

  As described above, in a horizontal electric field type liquid crystal display device, since charging of the glass substrate becomes a problem, it is important to prevent this.

  As a technique for that, in Patent Document 1, a TFT side glass substrate is disposed on the front side (observer side), a transparent conductive film is formed on the surface where the TFT is not formed, and the edge of the transparent conductive film is formed. A conductive cable is attached via an anisotropic conductive tape, and the conductive cable is connected to the ground of a circuit board disposed around the liquid crystal panel, thereby removing the surface charge of the TFT side glass substrate.

JP 2001-147441 A (FIGS. 2 and 3)

  As described above, in Patent Document 1, the TFT side glass substrate is disposed on the front side (observer side) for neutralizing the surface charge of the TFT side glass substrate, and the surface on which the TFT is not formed is transparent. In the manufacturing process, after forming the TFT, it is necessary to invert the TFT side glass substrate and form a transparent conductive film on the surface where the TFT is not formed. Has a problem that the equipment for reversing the TFT side glass substrate is necessary and the manufacturing cost increases.

  In addition, the conductive cable was attached to the edge of the transparent conductive film via an anisotropic conductive tape, and the conductive cable was connected to the ground of the circuit board disposed around the liquid crystal panel. The number of points increases, and there is a restriction that the conductive cable must be connected to the ground of the circuit board.

  The present invention has been made in order to solve the above-described problems. The configuration for removing static electricity from the surface on the viewer side of the liquid crystal panel is simplified, the configuration is less restricted, and in the manufacturing process. It is an object of the present invention to provide a liquid crystal display device with reduced manufacturing cost by adopting a configuration that can be applied without requiring new equipment.

  According to the liquid crystal display device of the first aspect of the present invention, between the first glass substrate on which the thin film transistor is formed and the second glass substrate disposed to face the first glass substrate. The liquid crystal is sealed, the pixel electrode and the counter electrode are arranged side by side on the first glass substrate, and the direction of the liquid crystal molecule is controlled by applying an electric field from the lateral direction to the liquid crystal molecule by the electric field generated between both electrodes. A liquid crystal display device comprising: the first and second glass substrates disposed opposite to each other; and a conductive polarizing plate mounted on the second glass substrate. Is mounted on the main surface of a resin case containing an optical member including a backlight so that the main surface is exposed to a bottomed and uncovered metal rear case. The liquid crystal stored A conductive sheet with a pressure-sensitive adhesive attached to the main surface of the resin case and the side surface of the rear case from the conductive polarizing plate of at least one of the four corners; Yes.

  According to the liquid crystal display device of the first aspect of the present invention, from the conductive polarizing plate of at least one of the four corners of the liquid crystal panel, the main surface of the resin case and the side surface of the rear case. Since the conductive sheet with the adhesive is attached to the surface, the surface charge of the conductive polarizing plate is discharged by flowing to the rear case through the conductive sheet with the adhesive, and the charge is accumulated on the surface of the conductive polarizing plate. Can be prevented. In addition, since a conductive polarizing plate is provided on the second glass substrate and the charge on the conductive polarizing plate is neutralized, a conductive polarizing plate and a conductive sheet with an adhesive can be prepared as a configuration for static elimination. In addition, new equipment for manufacturing the liquid crystal display device is unnecessary, and an increase in manufacturing cost can be suppressed. In addition, it is possible to remove static electricity from the conductive polarizing plate by simply sticking the adhesive conductive sheet so that it reaches the rear case, so the number of parts for static elimination can be reduced, and the adhesive sheet with adhesive can be attached. Since the position can be basically anywhere in the rear case, there is an advantage that there are few restrictions on the ground contact position.

<Embodiment>
<A. Device configuration>
FIG. 1 is a diagram showing a configuration of an embodiment of a liquid crystal display device according to the present invention.
FIG. 1 is a plan view of a horizontal electric field type liquid crystal display device 100 as viewed from the front side (observer side). The liquid crystal panel 1 is mounted on a resin case 3 containing an optical member such as a backlight. ing.

  Among the four side surfaces of the liquid crystal panel 1, TCP (tape carrier package) 2 is provided along each side surface in the vicinity of the upper side surface in the panel vertical direction (Y direction) and in the vicinity of the left side surface in the horizontal direction of the panel (X direction). The electric signal is provided to the liquid crystal panel 1.

  The size of the resin case 3 in the planar direction is larger than that of the liquid crystal panel 1, and the liquid crystal panel 1 is positioned by liquid crystal panel receiving portions 30 and 31 that are integrally molded so as to protrude from the main surface of the resin case 3. It is configured to be held in an area defined by the liquid crystal panel receiving portions 30 and 31. The display area 1a in the liquid crystal panel 1 is indicated by a broken line.

  Two liquid crystal panel receiving portions 30 are provided in pairs in the vicinity of two corners on the upper side of the liquid crystal panel 1 in the longitudinal direction of the panel (Y direction). More specifically, in the corner portion of the liquid crystal panel 1, liquid crystal is respectively provided on two side surfaces that are orthogonal to each other in the vicinity of the corner portion, that is, the side surface in the panel horizontal direction (X direction) and the side surface in the panel vertical direction (Y direction). The flat plate portions of the panel receiving portion 30 are provided so as to contact each other, and each of the liquid crystal panel receiving portions 30 has a rectangular plate shape.

  Two liquid crystal panel receiving portions 31 are provided in pairs in two corners on the lower side of the liquid crystal panel 1 in the panel vertical direction (Y direction). More specifically, the corner portion of the liquid crystal panel 1 is provided so as to be in contact with two side surfaces of the corner portion, that is, the side surface in the X direction and the side surface in the Y direction. Each of the liquid crystal panel receiving portions 31 is continuous with the first flat plate portion 31a and the first flat plate portion 31a, and the second flat plate portion 31b facing the first flat plate portion 31a at a substantially right angle. Are arranged so that the side surface forming the L shape is parallel to the main surface of the resin case 3. Of the two flat plate portions, the second flat plate portion 31 b is in contact with the side surface of the liquid crystal panel 1, and the first flat plate portion 31 a is not in contact with the side surface of the liquid crystal panel 1.

  And in the liquid crystal panel receiving part 31 which makes a pair, the 1st flat plate part 31a is arrange | positioned so that it may face the direction of the corner | angular part of the liquid crystal panel 1 together. Thus, the liquid crystal panel 1 is restricted from moving in the plane direction by the liquid crystal panel receiving portions 30 and 31.

  Further, the two corners on the lower side of the liquid crystal panel 1 are respectively adhered from the corner of the liquid crystal panel 1 to the main surface of the resin case 3 and the side surface of the metal rear case 4 that houses the resin case 3. A conductive sheet 5 with an agent is affixed. The rear case 4 has a bottomed and uncovered box shape, and the resin case 3 is accommodated in the rear case 4 so that the main surface on which the liquid crystal panel 1 is mounted is exposed.

  When the resin case 3 is stored in the rear case 4, the height of the side plate of the rear case 4 is set so that the height position of the main surface of the resin case 3 is approximately the same as the end surface of the side plate.

Here, the partial perspective view in the area | region Z shown in FIG. 1 is shown in FIG.
As shown in FIG. 2, the liquid crystal panel 1 has a conductive polarizing plate 1b as the uppermost layer, and a color filter side glass substrate 1d (second glass substrate) and a TFT side glass substrate 1c (first glass substrate) thereunder. Are disposed in order, and a polarizing plate (not shown) is disposed under the TFT side glass substrate 1c.

  The TFT side glass substrate 1c is larger in plan than the color filter side glass substrate 1d, the color filter side glass substrate 1d is larger in plan than the conductive polarizing plate 1b, and the conductive sheet 5 with adhesive is conductive. The polarizing plate 1b, the color filter side glass substrate 1d, and the TFT side glass substrate 1c are pasted from the respective corners to the side surface of the metallic rear case 4 through the main surface of the resin case 3. The rear case 4 is configured to contact a metal part of a housing (not shown) that houses the liquid crystal display device 100 and is grounded via the metal part.

  Here, as the conductive sheet 5 with adhesive, for example, a conductive tape made of a metal sheet coated with an adhesive containing conductive particles on the pasting surface can be used, and the conductive polarizing plate 1b. The surface charge of the conductive polarizing plate 1b can flow to the rear case 4 through the conductive sheet 5 with an adhesive.

  The conductive polarizing plate 1b has a structure having a transparent conductive film such as an ITO (Indium Tin Oxide) film on the main surface on the front side of the polarizing plate, or contains conductive particles in the front side surface of the polarizing plate. What is necessary is just to employ | adopt a structure.

FIG. 3 shows a partial plan view of the region Z shown in FIG.
As shown in FIG. 3, the conductive sheet 5 with adhesive has a rectangular shape in plan view, and the attachment position of the conductive sheet 5 with adhesive is the first flat plate of the liquid crystal panel 1 of the liquid crystal panel receiver 31. It is the structure prescribed | regulated by the part 31a.

  That is, there is a pair of liquid crystal panel receiving portions 31 at the corners of the liquid crystal panel 1, and each liquid crystal panel receiving portion 31 has a first flat plate portion 31 a that does not contact the side surface of the liquid crystal panel 1. The conductive sheet 5 with adhesive is disposed so that the short side is along the first flat plate portion 31a of the liquid crystal panel receiving portion 31 located on the upper side in the Y direction, and the liquid crystal panel receiving portion located on the upper side in the Y direction. By disposing the conductive sheet 5 with the adhesive so that the long side extends along the first flat plate portion 31 a of 31, the sticking position of the conductive sheet 5 with the adhesive can be uniquely determined.

FIG. 4 shows a cross-sectional configuration taken along line AA shown in FIG.
As shown in FIG. 3, the resin case 3 contains an optical member PM such as a backlight. A polarizing plate 1f faces the main surface of the resin case 3, and a TFT side glass substrate 1c and a color filter side glass are formed thereon. A substrate 1d and a conductive polarizing plate 1b are sequentially laminated to constitute the liquid crystal panel 1. Further, a metal front frame 10 is disposed so as to cover the front edge of the liquid crystal display device 100, but is indicated by a broken line in FIG. The front frame 10 is a member that covers the TCP2 arrangement area so that only the display area 1a can be seen by an observer, and a portion corresponding to the display area 1a is a window portion 101.

  Here, the position where the liquid crystal panel receiving portion 31 is provided is such that when the conductive sheet 5 with adhesive is attached along the first flat plate portion 31a of the liquid crystal panel receiving portion 31, the conductive sheet 5 with adhesive is liquid crystal. The position is set so as not to overlap the display area 1 a of the panel 1 and to be a position where the conductive sheet 5 with the adhesive cannot be seen from the window portion 101 of the front frame 10.

<B. Characteristic effects>
As described above, according to the liquid crystal display device 100, the surface charge of the conductive polarizing plate 1b is changed to the conductive with adhesive by attaching the conductive sheet 5 with the adhesive to the main surface of the conductive polarizing plate 1b. It is possible to prevent static electricity from being discharged by flowing to the rear case 4 through the sheet 5 and accumulating charges on the surface of the conductive polarizing plate 1b.

  Moreover, since the conductive polarizing plate 1b is provided on the color filter side glass substrate 1d and the charge on the conductive polarizing plate 1b is removed, the conductive polarizing plate 1b and the conductive sheet 5 with an adhesive need only be prepared. Compared to the configuration in which a transparent conductive film is formed on the surface of the TFT side glass substrate where the TFT is not formed and the TFT side glass substrate is neutralized, new equipment for manufacturing the liquid crystal display device 100 is not required. An increase in manufacturing cost can be suppressed.

  In addition, since the conductive polarizing plate 1b can be neutralized by simply sticking the adhesive-attached conductive sheet 5 so as to reach the rear case 4, the number of parts for static elimination can be reduced, and the conductive with adhesive Since the attachment position of the seat 5 may be basically anywhere on the rear case 4, there are few restrictions on the contact position.

  Further, the conductive sheet 5 with the adhesive along the first flat plate portion 31 a that does not come into contact with the side surface of the liquid crystal panel 1 of the liquid crystal panel receiving portion 31 that is disposed in pairs at the corner portions of the liquid crystal panel 1. By arranging the, it is possible to uniquely determine the sticking position of the conductive sheet 5 with adhesive, and the sticking work of the conductive sheet 5 with adhesive becomes easy.

  Further, in consideration of the position where the liquid crystal panel receiving part 31 is provided, the display area of the liquid crystal panel 1 is obtained when the conductive sheet 5 with adhesive is attached along the first flat plate part 31a of the liquid crystal panel receiving part 31. Since it does not overlap on 1a and can be uniquely positioned at a position that cannot be seen from the window portion 101 of the front frame 10, it is not necessary to give the adhesive conductive sheet 5 a special shape for positioning. It is possible to reduce the cost of the conductive sheet 5 with an adhesive.

  In the example shown in FIG. 1, the liquid crystal panel receiving portion 30 provided in pairs at two corners on the upper side of the liquid crystal panel 1 is assumed to have a simple rectangular plate shape. When sticking the conductive sheet 5 with adhesive on the two corners on the upper side of the liquid crystal, or on the two corners on the upper side instead of the two corners on the lower side of the liquid crystal panel 1 When the sheet 5 is pasted, the liquid crystal panel receiving portions 31 are disposed in pairs at the two corners on the upper side.

  Further, the position where the adhesive-attached conductive sheet 5 is pasted may be a corner portion of the liquid crystal panel 1, but may not be two corner portions. That is, it may be attached to at least one corner on the lower side or the upper side of the liquid crystal panel 1.

<C. Modification>
In the embodiment described above, in order to dispose the conductive sheet 5 with the adhesive along the first flat plate portion 31a of the liquid crystal panel receiving portion 31 that does not contact the side surface of the liquid crystal panel 1, Although the portion 31 is an L-shaped member, a liquid crystal panel receiving portion 32 shown in FIG. 5 may be used instead of the liquid crystal panel receiving portion 31.

  Each of the liquid crystal panel receiving portions 32 is a V-shaped member, and is disposed so that the side surface forming the V shape is parallel to the main surface of the resin case 3. In addition, the arrangement position of the liquid crystal panel receiving part 32 is the same as that of the liquid crystal panel receiving part 31 shown in FIGS. Of the two flat plate portions defining the V shape, the second flat plate portion 32b contacts the side surface of the liquid crystal panel 1, but the first flat plate portion 32a does not contact the side surface of the liquid crystal panel 1, and Each of the liquid crystal panel receiving portions 32 is arranged so that a plane is formed including the first flat plate portions 32a.

  Further, the pair of liquid crystal panel receiving portions 32 respectively disposed at the corners of the liquid crystal panel 1 are disposed such that the respective first flat plate portions 32a are arranged in a straight line, and the two first By arranging the conductive sheet 5 with the adhesive so that the long side linearly follows the flat plate portion 32a, the sticking position of the conductive sheet 5 with the adhesive can be uniquely determined. . And since the electroconductive sheet 5 with an adhesive should just make the long side follow the two 1st flat plate parts 32a, workability | operativity improves more.

  In addition, by arrange | positioning the electrically conductive sheet 5 with an adhesive as mentioned above, the electrically conductive sheet 5 with an adhesive will be affixed diagonally with respect to the corner | angular part of the liquid crystal panel 1, but at least one end Needless to say, it extends to the side of the rear case.

It is a top view which shows the whole structure of the liquid crystal display device of embodiment which concerns on this invention. It is a perspective view which shows the partial structure of the liquid crystal display device of embodiment which concerns on this invention. It is a top view which shows the partial structure of the liquid crystal display device of embodiment which concerns on this invention. It is sectional drawing which shows the partial structure of the liquid crystal display device of embodiment which concerns on this invention. It is a top view which shows the partial structure of the modification of the liquid crystal display device of embodiment which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal panel, 1b Conductive polarizing plate, 1c TFT side glass substrate, 1d Color filter side glass substrate, 3 Resin case, 4 Rear case, 5 Conductive sheet with adhesive, 31, 32 Liquid crystal panel receiving part, 31a, 32a 1st flat plate part, 31b, 32b 2nd flat plate part.

Claims (5)

A liquid crystal is sealed between the first glass substrate on which the thin film transistor is formed and the second glass substrate disposed to face the first glass substrate, and the liquid crystal is arranged side by side on the first glass substrate. A liquid crystal display device in which a pixel electrode and a counter electrode are arranged, and the direction of the liquid crystal molecules is controlled by applying an electric field from the lateral direction to the liquid crystal molecules by an electric field generated between both electrodes,
A liquid crystal panel having the first and second glass substrates opposed to each other and a conductive polarizing plate mounted on the second glass substrate, so that the conductive polarizing plate is the uppermost layer, It is mounted on the main surface of the resin case containing the optical member including the backlight,
The resin case is stored so that the main surface is exposed in a bottomed and uncovered metal rear case,
Of the four corners of the liquid crystal panel, a conductive sheet with an adhesive attached to the main surface of the resin case and the side surface of the rear case from the conductive polarizing plate of at least one corner. A liquid crystal display device. The resin case is
A plurality of liquid crystal panel receiving portions that are arranged so as to protrude from the main surface, and are provided in pairs near the corners of the liquid crystal panel so as to be in contact with the side surfaces orthogonal to each other;
Of each of the plurality of liquid crystal panel receivers, each of the first liquid crystal panel receivers disposed at corners of the liquid crystal panel to which the conductive sheet with adhesive is attached includes a first flat plate part, A second flat plate portion which is continuous with the first flat plate portion and forms a predetermined angle with respect to the first flat plate portion, and the second flat plate portion abuts on the side surface of the liquid crystal panel;
2. The liquid crystal display device according to claim 1, wherein the first liquid crystal panel receiving portions forming a pair are arranged such that each of the first flat plate portions faces a corner of the liquid crystal panel. The first liquid crystal panel receiving portion has an L shape, and is arranged so that an L-shaped side surface is parallel to the main surface of the resin case,
The conductive sheet with an adhesive has a rectangular shape in plan view,
The said adhesive sheet with an adhesive is affixed so that the short side and the long side may follow the said 1st flat plate part of each said 1st liquid crystal panel receiving part which makes a pair. Liquid crystal display device. The resin case is
A plurality of liquid crystal panel receiving portions that are arranged so as to protrude from the main surface, and are provided in pairs near the corners of the liquid crystal panel so as to be in contact with the side surfaces orthogonal to each other;
Of each of the plurality of liquid crystal panel receivers, each of the first liquid crystal panel receivers disposed at corners of the liquid crystal panel to which the conductive sheet with adhesive is attached includes a first flat plate part, A second flat plate portion which is continuous with the first flat plate portion and forms a predetermined angle with respect to the first flat plate portion, and the second flat plate portion abuts on the side surface of the liquid crystal panel;
The liquid crystal display device according to claim 1, wherein the paired first liquid crystal panel receiving portions are arranged so as to form a flat surface including each of the first flat plate portions. The first liquid crystal panel receiving portion has a V shape, and is arranged such that a side surface forming a V shape is parallel to the main surface of the resin case. The conductive sheet with the adhesive has a rectangular shape in plan view. ,
The said adhesive sheet with an adhesive is affixed so that the long side may follow the said 1st flat plate part of each said 1st liquid crystal panel receiving part which makes a pair linearly. Liquid crystal display device.

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