JP5310165B2 - Liquid crystal display - Google Patents

Description

  The present invention relates to a liquid crystal display device.

  Conventionally, a liquid crystal display device in which a liquid crystal panel is covered with a metal shield case is known (see, for example, Patent Document 1). Specifically, as shown in FIG. 4, the conventional liquid crystal display device 100 includes a back shield case 102 that covers the back and side surfaces of the liquid crystal panel 101, and a front shield case 103 that covers the front and side surfaces of the liquid crystal panel 101. Have. When the back shield case 102 and the front shield case 103 are assembled to the liquid crystal panel 101, the wall portion of one of the shield cases 102 and 103 faces the side surface of the liquid crystal panel 101.

JP 2006-10967 A

By the way, when the liquid crystal panel 101 is manufactured, in order to prevent a thin film transistor formed on one of the pair of transparent substrates from being destroyed by static electricity, the inner surfaces of the pair of transparent substrates facing each other are arranged. On one of the inner surfaces, a plurality of scanning lines connected to the gates and drains of the plurality of thin film transistors and a short ring connected to the plurality of signal lines are formed. The short ring is cut off and removed when the liquid crystal panel 101 is separated. For this reason, the end portions of the plurality of routing wirings formed on one inner surface for connecting the short ring to each scanning line and each signal line are cut off for separation into individual pieces of the liquid crystal panel 101. It will be exposed at the side.
For this reason, when the shield cases 102 and 103 and the liquid crystal panel 101 are assembled, the side surface of the liquid crystal panel 101 and the wall of the shield cases 102 and 103 come into contact with each other, and the shield case is interposed via the exposed end of the lead wiring. There is a possibility that the thin film transistor may be destroyed by static electricity charged in 102 and 103, and the yield of the liquid crystal display device may be reduced.
An object of the present invention is to provide a liquid crystal display device capable of preventing the occurrence of defects by preventing contact between an end portion exposed on a side surface of a liquid crystal panel in a lead wiring and a shield case.

In order to solve the above problems, according to one aspect of the present invention,
The transparent substrate has a pair of transparent substrates disposed opposite to each other with a predetermined gap, and the wiring formed on the inner surface of the pair of transparent substrates facing the other transparent substrate is the one transparent substrate. A liquid crystal panel exposed on the side of the
A rectangular frame-shaped top plate, and a shield case made of metal that covers the liquid crystal panel , and has a wall portion erected from each side of the top plate ,
The shield case includes a base portion made of metal erected from the top plate of the shield case , and a direction parallel to the front or back surface of the liquid crystal panel from the upper end of the base portion toward the side surface of the liquid crystal panel. projecting Te, restricting piece is provided with at least one projection made of metal,
The liquid crystal display device is characterized in that the tip of the protruding portion is arranged at a position different from the position where the inner surface of the one transparent substrate is arranged in the normal direction of the front surface or the back surface of the liquid crystal panel. Provided.

In the liquid crystal display device, preferably, the shield case has a wall portion disposed so as to face a side surface of the liquid crystal panel, and the projecting portion is provided with one end connected to the wall portion. It is .

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to prevent the end part exposed in the side surface of a liquid crystal panel among routing wiring, and a shield case from contacting, and to suppress the defect generation | occurrence | production of a liquid crystal display device.

It is a disassembled perspective view which shows schematic structure of the liquid crystal display device of this embodiment. FIG. 2 is an enlarged perspective view showing a part of a state where a liquid crystal panel is attached to a back case provided in the liquid crystal display device of FIG. 1. FIG. 3 is a view taken in the direction of arrow III in FIG. 2. It is a disassembled perspective view which shows schematic structure of the conventional liquid crystal display device.

  The best mode for carrying out the present invention will be described below with reference to the drawings. However, although various technically preferable limitations for implementing the present invention are given to the embodiments described below, the scope of the invention is not limited to the following embodiments and illustrated examples.

  FIG. 1 is an exploded perspective view showing a schematic configuration of the liquid crystal display device of the present embodiment. As shown in FIG. 1, the liquid crystal display device 1 includes a liquid crystal panel 10 and a shield case 20.

  The liquid crystal panel 10 includes a pair of substantially rectangular transparent substrates 11 and 12 arranged to face each other with a predetermined gap, a liquid crystal layer (not shown) sealed in the gap between the transparent substrates 11 and 12, A first and a second are provided on inner surfaces facing each other of the pair of transparent substrates 11 and 12, respectively, for forming a plurality of pixels for controlling the light transmission by changing the alignment state of the liquid crystal molecules of the liquid crystal layer by applying a voltage. Two transparent electrodes (not shown), a polarizing plate 14 attached to the outer surface of one of the transparent substrates 11 and 12, and a polarizing plate attached to the outer surface of the other transparent substrate 11. (Not shown). The liquid crystal panel 10 is configured such that light is incident on one transparent substrate 12 out of a pair of transparent substrates 11 and 12 from a surface light source unit (not shown) disposed on the opposite side to the observation side. The display is performed toward the observation side of the transparent substrate 11.

  Although not shown in detail, the inner surface of the TFT substrate 12, which is one of the pair of transparent substrates 11, 12, serves as a first electrode formed in a matrix in the row and column directions. A plurality of transparent pixel electrodes, a plurality of TFTs (thin film transistors) arranged corresponding to the pixel electrodes and connected to the corresponding pixel electrodes, and gate electrodes of the TFTs in each row are connected to the gate electrodes. A plurality of scanning lines for supplying gate signals to the TFTs, a plurality of signal lines connected to the source electrodes or drain electrodes of the TFTs in each column and supplying data signals to the respective source electrodes or drain electrodes, and covering these A formed first alignment film is provided. On the inner surface of the CF substrate 11, which is the other of the pair of transparent substrates 11, 12, three color filters of red, green, and blue formed corresponding to each pixel electrode, and the color filters of these color filters A single film-like transparent counter electrode formed so as to face the arrangement region of each pixel electrode and a second alignment film formed so as to cover the counter electrode are provided.

  A short ring connected to a plurality of scanning lines and a plurality of signal lines connected to the gates and drains of the plurality of TFTs is formed on the TFT substrate 12 before the liquid crystal panel 10 is separated. Yes. For this reason, after the liquid crystal panel 10 is separated into pieces, the end portions 13 of the routing wiring connected to the plurality of scanning lines and the plurality of signal lines are exposed on the side surface of the TFT substrate 12 (see FIG. 3). Further, polarizing plates 14 are superimposed on the back surface (the outer surface opposite to the inner surface of the TFT substrate 12) and the front surface (the outer surface opposite to the inner surface of the CF substrate 11) of the liquid crystal panel 10, respectively.

  The shield case 20 is a substantially rectangular metal case having an outer shape along the periphery of the liquid crystal panel 10. As shown in FIG. 1, the shield case 20 includes a back case 22 that covers the back and side surfaces of the liquid crystal panel 10, and a front case 21 that covers the surface and side surfaces of the liquid crystal panel 10.

  The back surface case 22 includes a bottom plate 221 having a substantially rectangular frame shape, and a wall portion 222 erected from each side of the bottom plate 221. An opening 223 for exposing the display area of the liquid crystal panel 10 is formed in the bottom plate 221, and a surface light source unit is disposed outside the bottom plate 221 so that the emission surface is located in the opening 223. On the other hand, the surface case 21 includes a top plate 211 having a substantially rectangular frame shape and a wall portion 212 erected from each side of the top plate 211. The top plate 211 has an opening 213 for exposing the display area of the liquid crystal panel 10. When the back case 22 and the front case 21 are combined, the wall portion 212 of the front case 21 is disposed inside the wall portion 222 of the back case 22 so that they are engaged with each other.

  At this time, the inner surface of the wall portion 212 of the front surface case 21 or the inner surface of the wall portion 222 of the rear surface case 22 is disposed so as to face each side surface of the transparent substrates 11 and 12 of the liquid crystal panel 10. The liquid crystal panel 10 is sandwiched between the top plate 211 of the front case 21 and the bottom plate 221 of the back case 22 so that the positional deviation along the normal direction of the transparent substrates 11 and 12 of the liquid crystal panel 10 is achieved. Is suppressed. And in the area | region adjacent to the wall part 212 in the four corner | angular parts of the baseplate 211 in the surface case 21 used as an inner side, respectively, it stands up along the normal line direction of the surface or back surface of the liquid crystal panel 10, and a front-end | tip part Is provided with a pair of regulating pieces 30 bent inward. The pair of regulating pieces 30 are respectively opposed to the pair of sides forming the corners of the liquid crystal panel 10 when viewed from the front.

  FIG. 2 is an enlarged perspective view showing a part of the state where the liquid crystal panel 10 is attached to the back case 21, and FIG. 3 is a view taken along the arrow III in FIG. 2 (a side view of the portion shown in FIG. 2). is there. As shown in FIGS. 2 and 3, the restriction piece 30 includes a base 31 standing from the top plate 211, and the surface of the liquid crystal panel 10 or the surface of the liquid crystal panel 10 from the upper end of the base 31 toward the inside where the liquid crystal panel 10 is disposed. A protrusion 32 protrudes along a direction parallel to the back surface, and has a protrusion 32 whose tip faces the side surface of the liquid crystal panel 10. Here, the position of the tip of the protrusion 32 of the regulating piece 30 is set so as to face the position avoiding the boundary L between the TFT substrate 12 and the CF substrate 11 in the liquid crystal panel 10. Specifically, in the normal direction of the front or back surface of the liquid crystal panel 10, the position where the protrusion 32 protrudes from the restriction piece 30 is different from the position where the inner surface of the TFT substrate 12 or the inner surface of the CF substrate 11 is disposed. The protruding portion 32 of the restriction piece 30 is provided so as to be positioned. Further, in the normal direction of the front surface or the back surface of the liquid crystal panel 10, the thickness of the tip of the protruding portion 32 of the regulating piece 30 is set to be smaller than the thickness of each of the transparent substrates 11 and 12.

  In this case, as shown in FIG. 3, the tip of the protrusion 32 may be disposed only facing the side surface 121 of the TFT substrate 12, or the CF substrate 11 as shown by the dotted line T in FIG. 3. You may make it arrange | position only facing the side surface 111 of this. Further, the tip of the protruding portion 32 may be disposed so as to face both the side surface 121 of the TFT substrate 12 and the side surface 111 of the CF substrate 11. In addition, the protrusion part 32 may be in contact with the side surface (the side surface 121 or the side surface 111) of the liquid crystal panel 10, or may be separated by a predetermined interval. When the liquid crystal panel 10 is in direct contact with the shield case 20, the amount of positional deviation of the liquid crystal panel 10 with respect to the shield case 20 can be further reduced.

As described above, since the regulating piece 30 is disposed at a position avoiding the boundary L between the TFT substrate 12 and the CF substrate 11 in the liquid crystal panel 10 so that the tip of the protruding portion 32 faces, the liquid crystal panel Even if 10 is displaced in a direction parallel to the front surface or the back surface and the side surface thereof contacts the regulating piece 30, the end 13 exposed on the side surface of the liquid crystal panel 10 and the regulating piece 30 are not connected to each other. There is no contact. Therefore, when assembling the front case 21 and the back case 22 and the liquid crystal panel 10, the side surface of the liquid crystal panel 10 and the wall portion 212 of the front case 21 or the wall portion 222 of the back case 22 come into contact with each other. Further, it is possible to prevent the shield case 20 from coming into contact with the end 13 exposed on the side surface of the liquid crystal panel in the routing wiring.
In particular, in the above embodiment, the pair of regulating pieces 30 are provided at the four corners of the bottom plate 211 in the inner surface case 21, so that the front case 21, the rear case 22, and the liquid crystal panel. When the liquid crystal panel 10 is displaced in a direction parallel to the inner surface or the outer surface of each of the transparent substrates 11 and 12 of the liquid crystal panel 10, the exposed end portion 13 of the lead wiring and the wall portion 212 are formed. Contact can be prevented.

  In any of the above cases, it is possible to prevent the thin film transistor of the liquid crystal panel 10 from being destroyed by static electricity through the exposed end portion 13 of the lead wiring, and thus to suppress the occurrence of defects in the liquid crystal display device 1. Become.

Note that the present invention is not limited to the above embodiment, and can be modified as appropriate.
For example, in the present embodiment, a pair of restricting pieces 30 are provided at the four corners of the substantially rectangular shield case 20, and the protruding portions 32 of the restricting pieces 30 are disposed to face the respective side surfaces of the liquid crystal panel 10. In the example described above, at least one restricting piece 30 is provided on each of the four sides of the shield case 20 corresponding to each side of the liquid crystal panel 10, and the protrusions 32 of the restricting pieces 30 are respectively provided. You may make it arrange | position facing each side surface of the liquid crystal panel 10. FIG.
Also in this case, when assembling the front case 21 and the back case 22 and the liquid crystal panel 10, the side surface of the liquid crystal panel 10 and the wall portion 212 of the front case 21 or the wall portion 222 of the back case 22 come into contact. Thus, it is possible to prevent the shield case 20 from coming into contact with the end 13 exposed on the side surface of the liquid crystal panel in the routing wiring. In addition, when the front case 21 and the rear case 22 and the liquid crystal panel 10 are assembled by appropriately selecting the position where the restricting piece 30 is provided, the liquid crystal panel 10 is displaced in the shield case 20 due to some influence. Further, the side surface of the liquid crystal panel 10 and the wall portion 212 of the front surface case 21 or the wall portion 222 of the back surface case 22 come into contact with each other, and the end portion 13 exposed on the side surface of the liquid crystal panel in the routing wiring and the shield case 20 Can be prevented from coming into contact with each other.

Further, at least one restricting piece 30 is provided on one side of the shield case 20 corresponding to at least one side of the liquid crystal panel 10, and the protrusion 32 of the at least one restricting piece 30 is disposed to face the side surface of the liquid crystal panel 10. Alternatively, a pair of restricting pieces 30 may be provided at at least one corner of the shield case 20, and the protrusions 32 of the pair of restricting pieces 30 may be disposed to face the side surfaces of the liquid crystal panel 10. You may make it do.
Also in these cases, when assembling the front case 21 and the back case 22 and the liquid crystal panel 10, the side surface of the liquid crystal panel 10 and the wall portion 212 of the front case 21 or the wall portion 222 of the back case 22 contact each other. And it can prevent that the edge part 13 exposed in the side surface of a liquid crystal panel among the routing wiring, and the shield case 20 contact.

  Further, in the present embodiment, the case where the plurality of regulating pieces 30 are formed in the front case 21 among the front case 21 and the back case 22 has been described as an example. Can be provided on the back case 22 disposed outside the front case 21. Here, when the protruding portion 32 of the back surface case 22 and the wall portion 212 of the front surface case 21 overlap, a notch is provided so that the protruding portion is disposed inside the wall portion 212 of the front surface case 21. In addition, it is necessary that at least the protruding portion 32 of the regulating piece 30 is disposed to face the side surface of the liquid crystal panel 10. On the other hand, as in the above-described embodiment, among the front case 21 and the rear case 22 that accommodates the liquid crystal panel 10, a plurality of regulating pieces 30 are provided in one case in which the side wall is disposed inside. In this case, the other case may not be provided with a notch or the like.

It is also possible to divide the plurality of regulating pieces 30 into the back case 21 and the front case 22 respectively.
In addition, the wall portion 212 and the restriction piece 30 may be formed continuously, not limited to the case where the restriction piece 30 is provided in the region adjacent to the wall portion 212 of the bottom plate 211 in the inner surface case 21. Alternatively, the protruding portion 32 may be formed directly on the wall portion 212.
Further, the restriction piece 30 is disposed at a position where at least the tip of the projecting portion 32 is different from the position where the inner surface of the TFT substrate 12 and the inner surface of the CF substrate 11 are disposed in the normal direction of the front surface or the back surface of the liquid crystal panel 10. The liquid crystal panel 10 may not necessarily protrude along a direction parallel to the front or back surface of the liquid crystal panel 10.

1 Liquid crystal display device 10 Liquid crystal panel 11 CF substrate (transparent substrate)
12 TFT substrate (transparent substrate)
13 End 14 Polarizing plate 20 Shield case 21 Surface case (first case)
22 Back case (second case)
30 Restriction piece 31 Base part 32 Projection part 111 Side surface 121 Side surface 211 Top plate 212 Wall part 221 Bottom plate 222 Wall part 223 Opening L boundary

Claims (2)

The transparent substrate has a pair of transparent substrates disposed opposite to each other with a predetermined gap, and the wiring formed on the inner surface of the pair of transparent substrates facing the other transparent substrate is the one transparent substrate. A liquid crystal panel exposed on the side of the
A rectangular frame-shaped top plate, and a shield case made of metal that covers the liquid crystal panel , and has a wall portion erected from each side of the top plate ,
The shield case includes a base portion made of metal erected from the top plate of the shield case , and a direction parallel to the front or back surface of the liquid crystal panel from the upper end of the base portion toward the side surface of the liquid crystal panel. projecting Te, restricting piece is provided with at least one projection made of metal,
The liquid crystal display device, wherein a tip of the protruding portion is disposed at a position different from a position where the inner surface of the one transparent substrate is disposed in a normal direction of the front surface or the back surface of the liquid crystal panel. The liquid crystal display device according to claim 1.
The shield case has a wall portion arranged to face the side surface of the liquid crystal panel,
The liquid crystal display device, wherein the protruding portion is provided with one end connected to the wall portion.

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