JP2007187822A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a liquid crystal cell from being damaged due to positional displacement of a substrate even when an adequate distance is not kept between the liquid crystal cell and a side wall section of a backlight frame. <P>SOLUTION: An edge of one substrate is positioned to be more inside than that of another substrate whose surface is in contact with a placing part 32 of the backlight frame 30 out of an array substrate 21 and a counter substrate 22. That is, when the liquid crystal cell 20 is arranged in such a way that the surface of the array substrate 21 is in contact with the placing part 32, the end edge of the counter substrate 22 is positioned to be more inside than that of the array substrate 21. Also, when the liquid crystal cell 20 is arranged in such a way that the surface of the counter substrate 22 is in contact with the placing part 32, the edge of the array substrate 21 is positioned to be more inside than that of the counter substrate 22. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device including a liquid crystal cell in which a pair of substrates are disposed to face each other with a liquid crystal layer interposed therebetween.

  In the manufacture of a liquid crystal display device, an array substrate having a pixel portion in which switching elements are arranged in each of a plurality of pixels and a counter substrate are arranged to face each other, and both substrates are made of a sealing material arranged along four sides. A liquid crystal cell is configured by bonding and injecting a liquid crystal material into a portion surrounded by a sealing material. A rear surface or a side light type surface light source type backlight is disposed on the rear surface of the array substrate, and the liquid crystal cell and the backlight are fixed by a backlight frame and a bezel.

  The array substrate and the counter substrate are each configured such that a plurality of substrates are separated from a large substrate (mother substrate) by a cutting blade, and the separation position (cut line) is the same for both substrates. Due to the variation in the contact position or the bonding position of the two substrates, the edge of the counter substrate may protrude outward from the edge of the array substrate.

6 shows a state in which the liquid crystal cell 20 is fitted into the mounting portion 32 of the backlight frame 30 and the edge of the array substrate 21 in the liquid crystal cell 20 is in contact with the inner surface of the rib 31 of the backlight frame 30. Show. In addition, the thing of patent document 1, 2 is known as a technique relevant to this application.
JP 2003-121817 A JP-A-11-242210

  In recent years, market demands for light, thin and small liquid crystal display devices are strong, and it has become impossible to provide a sufficient distance between a liquid crystal cell and a backlight frame. Therefore, as described above, when the end side of the counter substrate 22 protrudes outward from the end side of the array substrate 21, as shown in FIG. The problem that the side gets on and the sealing material 23 is peeled off or the counter substrate 22 is broken occurs.

  The present invention has been made in view of the above, and it is an object of the present invention to provide a liquid crystal cell due to misalignment of the substrate without taking a sufficient distance between the liquid crystal cell and the backlight frame. This is to prevent damage from occurring.

  A liquid crystal display device according to a first aspect of the present invention includes a liquid crystal cell including a liquid crystal layer in a gap between an array substrate and a counter substrate, and a backlight frame including a mounting portion for mounting the liquid crystal cell. Of the array substrate and the counter substrate, the position of the edge of the other substrate is set to the inside with respect to the edge of the substrate whose surface is in contact with the mounting portion of the backlight frame.

  In the present invention, the position of the edge of the other substrate is set to the inside of the backlight frame rather than the edge of the substrate whose surface is in contact with the mounting portion of the backlight frame of the array substrate and the counter substrate. This prevents the other board from riding on the backlight frame.

  A liquid crystal display device according to a second aspect of the present invention includes a liquid crystal cell having a liquid crystal layer in the gap between the array substrate and the counter substrate, a backlight frame holding the liquid crystal cell and having a frame-shaped side wall, and the array substrate. And a member for adhering end portions facing the side wall portions of the backlight frames of the opposing substrates.

  In the present invention, by arranging a member for adhering both substrates to a portion of the array substrate and the counter substrate that are close to the side wall of the backlight frame, one substrate does not ride on the backlight frame. Like that. When an adhesive is used as the bonding member, it can be firmly fixed, and when a tape is used, the thickness is reduced, so that the arrangement space can be reduced.

  A liquid crystal display device according to a third aspect of the present invention includes a liquid crystal cell having a liquid crystal layer in a portion surrounded by a sealing material in a gap between an array substrate and a counter substrate, and a liquid crystal cell that holds the liquid crystal cell from a frame-shaped side wall portion. And a backlight frame provided with ribs protruding in the direction, wherein the width of the sealing material at a position corresponding to the rib is wider than the width of the sealing material at the other portions.

  In the present invention, among the sealing materials for sealing the liquid crystal layers of the array substrate and the counter substrate, the width of the sealing material at the position corresponding to the portion facing the rib of the backlight frame is set to the sealing material at the other portions. Since the bonding strength of the array substrate and the counter substrate in the widened portion increases by making it wider than the width of the substrate, even if one substrate rides on the backlight frame, the sealing material peels off or the substrate breaks A malfunction can be prevented. In addition, since there are no newly required members as compared with the conventional liquid crystal device, it is possible to use the production equipment so far.

  In the liquid crystal display device according to the present invention, the thickness of the array substrate and the counter substrate is in the range of 0 to 0.4 mm.

  In the conventional configuration, when the thickness of the substrate is 0.4 mm, damage has occurred. By using the configuration of each liquid crystal display device described above, the thickness of each substrate can be reduced to 0.4 mm or less. Can be further reduced in thickness.

  According to the liquid crystal display device of the present invention, it is possible to prevent the liquid crystal cell from being damaged due to the displacement of the substrate without taking a sufficient distance between the liquid crystal cell and the rib of the backlight frame.

  FIG. 1 is a plan view showing a schematic configuration of a liquid crystal display device according to the present embodiment. In the figure, a state in which the liquid crystal cell 20 is fitted into the backlight frame 30 is shown.

  In the liquid crystal cell 20, the array substrate 21 and the counter substrate 22 are arranged to face each other, and the both substrates are bonded together by a sealing material 23 arranged along four sides in the gap between the two substrates. A liquid crystal material is injected into a portion surrounded by the sealing material 23 to form a liquid crystal layer. The distance between the edge of the liquid crystal cell 20 and the backlight frame 30 is the shortest at the rib 31 portion of the backlight frame 30.

  FIG. 2 is an enlarged cross-sectional view of the rib 31 portion. As shown in the figure, in the liquid crystal cell 20, a sealing material 23 for adhering both substrates is disposed in the gap between the array substrate 21 and the counter substrate 22, and a liquid crystal layer 24 is formed in a portion surrounded by the sealing material 23. The The surface of the counter substrate 22 is located on the display surface of the liquid crystal cell 20, and the polarizing plate 25 is disposed on this surface. A polarizing plate 26 is disposed on the back surface of the array substrate 21.

  The liquid crystal cell 20 is fixed in a state where the rear end portion of the array substrate 21 is in contact with the mounting portion 32 of the backlight frame 30.

  The backlight frame 30 has a frame-shaped side wall portion 33 formed of a synthetic resin and has a rectangular main body portion 34 as a whole, and projects inward from an intermediate portion of the side wall portion 33 so that the array substrate 21 A mounting portion 32 for mounting the peripheral portion of the back surface, and a plurality of ribs 31 formed on at least a pair of opposing sides projecting inwardly connected to the mounting portion 32 and the side wall portion 33. Has been.

  Then, a non-illustrated back surface or side light type surface light source type backlight is fixed to the backlight frame 30 with the mounting portion 32 interposed therebetween so as to be positioned on the back surface side of the liquid crystal cell 20.

  In this liquid crystal display device, of the array substrate 21 and the counter substrate 22, the position of the edge of the other substrate is inward with respect to the edge of the substrate whose surface is in contact with the mounting portion 32 of the backlight frame 30. Each board | substrate is arrange | positioned so that it may come. In FIG. 2, when the liquid crystal cell 20 is arranged so that the back surface of the array substrate 21 is in contact with the mounting portion 32, the state in which the end side of the counter substrate 22 is located inside the end side of the array substrate 21 is illustrated. Show. In order to enable such an arrangement, specifically, the position of the cut line when the counter substrate 22 is separated from the large substrate (mother substrate) is located inside the cut line from the large substrate of the array substrate 21. To do. Contrary to the above case, when the liquid crystal cell 20 is inverted and disposed so that the surface of the counter substrate 22 is in contact with the mounting portion 32 of the backlight frame 30, the array is arranged more than the edge of the counter substrate 22. The edge of the substrate 21 is set to the inside.

  Therefore, according to the present embodiment, of the array substrate 21 and the counter substrate 22, the edge of the other substrate is in contact with the edge of the substrate whose outer surface is in contact with the mounting portion 32 of the backlight frame 30. By arranging the position on the inner side, the substrate whose outer surface is not in contact with the mounting portion 32 does not run on the end surface of the side wall portion 33 of the backlight frame 30, so that the sealing material 23 is peeled off. In addition, the problem that the array substrate 21 and the counter substrate 22 are broken can be prevented, and the liquid crystal cell 20 can be damaged due to the displacement of the substrate without taking a sufficient distance between the liquid crystal cell 20 and the backlight frame 30. Can be prevented.

  Further, in the conventional configuration, there is a problem that the sealing material is peeled off or the substrate is cracked when the thickness of the substrate is 0.4 mm. However, by applying the configuration of the liquid crystal display device, the thickness of each substrate can be reduced. The thickness can be reduced to 0.4 mm or less, and the liquid crystal cell can be further reduced in thickness. Each substrate can be thinned down to 0.2 mm by the current manufacturing technology, and development is progressing with the aim of further thinning. Even if it is applied to the above, the same effect can be obtained.

  In the present invention, when the substrate itself is thin and the hardness in the thickness direction of the substrate is low, the present invention can be applied to a thin substrate that is easily bent.

  Next, another embodiment of the present liquid crystal display device will be described with reference to FIGS. Here, a member for adhering both substrates is disposed on an end portion of each of the array substrate 21 and the counter substrate 22 that is close to the side wall portion 33 of the backlight frame 30. FIG. 3 shows a state where the adhesive 27 is used as the bonding member, and FIG. 4 shows a state where the tape 28 is used. The cut lines of the array substrate 21 and the counter substrate 22 are the same for both substrates, and both substrates have the same size. In addition, in FIG.3 and FIG.4, the same code | symbol shall be attached | subjected to the same thing as FIG. 2, and the overlapping description is abbreviate | omitted here.

  As described above, the members 27 (or 28) for bonding the two substrates to each other are disposed on the end portions of the array substrate 21 and the counter substrate 22 that are close to the side wall portion 33 of the backlight frame 30. Since the side portions are integrated, only the edge of one substrate on the side opposite to the mounting portion 32 side of the backlight frame 30 does not protrude outward. Since it does not run on the end surface of the side wall 33 of the light frame 30, it is possible to prevent the problem that the sealing material 23 is peeled off or the substrate is cracked.

  In particular, when the adhesive 27 is used as the bonding member, it can be firmly fixed, and when the tape 28 is used, the bonding member itself is thinner and more uniform. Therefore, the arrangement space can be reduced as compared with the case where the adhesive 27 is used.

  Furthermore, it is possible to determine the bonding accuracy of both substrates by observing the inclined state of the bonding members during or after the bonding members are bonded. It is also possible to eliminate non-defective products.

  Next, still another embodiment of the present liquid crystal display device will be described with reference to FIG. Here, the width L of the sealing material 23 at the position corresponding to the portion adjacent to the rib 31 formed on the side wall portion 33 of the backlight frame 30 at each end of the array substrate 21 and the counter substrate 22 is set at the other portions. It is made wider than the width of the sealing material 23.

  Specifically, for example, the width in the display surface direction of the sealing material 23 at a position corresponding to the rib 31 in FIG. 1 is made wider than the width of the sealing material 23 in other portions. In FIG. 5, the same components as those in FIG. 2 are denoted by the same reference numerals, and redundant description is omitted here.

  In this way, the width L of the seal material 23 at a position corresponding to the portion where the end sides of the array substrate 21 and the counter substrate 22 are close to the rib 31 of the backlight frame 30 is set to the width of the seal material 23 at other portions. By making it wider than the width, the bonding strength of the array substrate 21 and the counter substrate 22 in this widened portion increases, so even if one substrate rides on the end face of the side wall 33 of the backlight frame 30, The problem that the sealing material 23 is peeled off or the substrate is broken can be prevented. Further, as compared with the conventional liquid crystal display device, it is possible to deal with only by changing the pattern of the sealing material 23 and there is no newly required member, so that the manufacturing equipment up to that point can be used as it is.

  In the description of the above embodiment, the case where a plurality of ribs 31 are provided is described. However, the rib 31 may be a single configuration, and moreover, a plurality of ribs 31 may be provided on each side where the ribs 31 are required. It is also possible to configure the single rib 31 to be dispersed.

  In addition, the rib 31 is not limited to a tongue-like shape, and the same effect is exhibited even when the rib 31 is formed so as to extend along the length of the side.

It is a top view which shows the schematic structure of the liquid crystal display device in one Embodiment. It is an expanded sectional view which shows the structure in the AA part of FIG. It is an expanded sectional view which shows another structure in the AA part of FIG. It is an expanded sectional view which shows another structure in the AA part of FIG. It is an expanded sectional view which shows another structure in the AA part of FIG. It is sectional drawing which shows the schematic structure of the conventional liquid crystal display device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 20 ... Liquid crystal cell 21 ... Array substrate 22 ... Opposite substrate 23 ... Sealing material 24 ... Liquid crystal layer 25, 26 ... Polarizing plate 27 ... Adhesive 28 ... Tape 30 ... Backlight frame 31 ... Rib 32 ... Mounting part 33 ... Side wall part 34 ... Main unit

Claims (6)

A liquid crystal cell having a liquid crystal layer in the gap between the array substrate and the counter substrate;
A backlight frame having a mounting portion for mounting the liquid crystal cell;
A liquid crystal display characterized in that the position of the edge of the other substrate is set to the inner side with respect to the edge of the substrate whose surface is in contact with the mounting portion of the backlight frame among the array substrate and the counter substrate. apparatus. A liquid crystal cell having a liquid crystal layer in the gap between the array substrate and the counter substrate;
A backlight frame that holds the liquid crystal cell and has a frame-shaped side wall; and
A member for adhering an end portion to the side wall portion of the backlight frame of each of the array substrate and the counter substrate;
A liquid crystal display device comprising:   The liquid crystal display device according to claim 2, wherein the member is an adhesive.   The liquid crystal display device according to claim 2, wherein the member is a tape. A liquid crystal cell having a liquid crystal layer in a portion surrounded by a sealing material in the gap between the array substrate and the counter substrate;
A backlight frame having ribs that hold the liquid crystal cell and project inwardly from a frame-shaped side wall;
A liquid crystal display device, wherein the width of the sealing material at a position corresponding to the rib is wider than the width of the sealing material at other portions. 6. The liquid crystal display device according to claim 1, wherein the thickness of the array substrate and the counter substrate is in the range of 0 to 0.4 mm.

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