JP2010152255A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device that prevents conductive resin from being easily separated. <P>SOLUTION: The liquid crystal display device includes: a first substrate 10 having a first section 14 and a second section 16; a second substrate 12 facing the second section 16 of the first substrate 10; a pad 22 formed on the first section 14 of the first substrate 10 on a position close to one end part of a width in a direction along a boundary between the first section 14 and the second section 16; a conductive film 18 formed on a surface of the second substrate 12, which is opposite to a surface facing the first substrate 10; and conductive resin 24 formed so as to surround the outside of the opposite surfaces and side end surfaces of the first substrate 10 and the second substrate 12, including portions formed on the pad 22 and the conductive film 18 on the position close to the end part of the width, to electrically connect the pad 22 to the conductive film 18. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device.

In a horizontal electric field type liquid crystal display device, it is known that a conductive film is formed on the outer surface of a liquid crystal display panel, and the conductive film is electrically connected to a GND pad with a conductive paste (see Patent Document 1). By electrostatic shielding of the conductive film connected to the GND pad, it is possible to prevent display abnormality from occurring when a high potential due to static electricity or the like is applied from the outside.
JP 2008-145686 A

  Conventionally, since the conductive paste is provided by a coating method, there is a problem that it is easily peeled off.

  An object of this invention is to provide the liquid crystal display device from which a conductive resin cannot peel easily.

  (1) A liquid crystal display device according to the present invention includes a first substrate having a first portion and a second portion, a second substrate facing the second portion of the first substrate, the first portion, and the first portion. The pad formed on the first portion of the first substrate and the second substrate are opposed to the first substrate at a position biased to one end of the width in the direction along the boundary line between the two portions. A conductive film formed on a surface opposite to the surface to be formed, and a portion provided on the pad and the conductive film at a position biased to the end of the width, and the first substrate and the second substrate And a conductive resin which is provided so as to surround the opposite surfaces of the substrate and the outside of the side end surfaces, and electrically connects the pad and the conductive film. According to the present invention, since the conductive resin is provided so as to surround the opposite surfaces of the first substrate and the second substrate and the outside of the side end surfaces, it is difficult to peel off.

  (2) In the liquid crystal display device described in (1), the end portion of the second substrate has a shape with a corner cut away at a position biased to the end portion of the width, and the boundary line A first side along the second side, a second side extending in a direction perpendicular to the first side, and a third side obliquely connecting the first side and the second side, wherein the conductive resin is The first side, the second side, and the third side may be provided.

  (3) In the liquid crystal display device described in (2), the end portion of the first substrate has a shape with a corner cut away at a position biased to the end portion of the width, and the boundary line A fourth side extending in a direction perpendicular to the fourth side, and a sixth side obliquely connecting the fourth side and the fifth side, the conductive resin comprising: , And may be provided so as to be placed on the fourth side, the fifth side, and the sixth side.

  (4) The liquid crystal display device according to any one of (1) to (3), further including a frame that supports the first substrate and the second substrate, wherein the frame is made of the conductive resin. In addition, a recess may be provided to avoid a portion protruding outward from the first substrate and the second substrate.

  (5) The liquid crystal display device according to (4), further including a conductive tape connected to a portion of the conductive resin located on a surface of the first substrate opposite to the second substrate. May be a feature.

  (6) The liquid crystal display device described in (5) may further include a wiring board attached to the first board, and the wiring board and the conductive tape may be electrically connected. Good.

  (7) The liquid crystal display device described in (5) may further include a metal frame, and the metal frame and the conductive tape are electrically connected.

  (8) The liquid crystal display device described in (7) may further include a wiring board attached to the first board, and the wiring board and the metal frame may be electrically connected. Good.

  (9) In the liquid crystal display device described in (8), the wiring board may be arranged on a side opposite to the first substrate of the metal frame.

  (10) In the liquid crystal display device described in (8), the wiring board may be disposed between the metal frame and the first substrate.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a plan view showing a liquid crystal display device according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the liquid crystal display device shown in FIG. 1 taken along the line II-II. 3 is a cross-sectional view of the liquid crystal display device shown in FIG. 1 taken along line III-III. 4 is a cross-sectional view of the liquid crystal display device shown in FIG. 1 taken along line IV-IV.

  The liquid crystal display device includes a first substrate 10 and a second substrate 12. Both the first substrate 10 and the second substrate 12 may be a glass substrate or a resin substrate. The first substrate 10 is a TFT substrate on which thin film transistors (TFTs), electrodes, wirings, and the like (not shown) are formed. The second substrate 12 is a color filter substrate on which a colored layer and a black matrix are formed. A liquid crystal (not shown) is disposed between the first substrate 10 and the second substrate 12. An electrode for driving the liquid crystal is disposed only on the first substrate 10, and a voltage is applied in the horizontal direction of the liquid crystal (not shown). That is, the driving method of the liquid crystal is an IPS (In-Plane-Switching) method.

  The first substrate 10 has a first portion 14 and a second portion 16. The second substrate 12 is disposed so as to face the second portion 16 of the first substrate 10. A liquid crystal (not shown) is disposed between the second portion 16 of the first substrate 10 and the second substrate 12. The second portion 16 is formed with electrodes (not shown) for driving the liquid crystal and thin film transistors (not shown). The first portion 14 protrudes from the second substrate 12, and a wiring (not shown) electrically connected to an electrode (not shown) formed on the second portion 16 is formed.

The end of the second substrate 12 has a shape in which corners are notched at a position that is biased toward the end of the width in the direction along the boundary line between the first portion 14 and the second portion 16 of the first substrate 10. ing. Therefore, the second substrate 12, the end portion, the first side _{S 1} along the boundary line, the second side _{S 2} extending in a direction perpendicular to the first side _{S 1,} the first side _{S 1} and the and a third side _{S 3} that connect the two sides _{S 2} at an angle, a.

A conductive film 18 is formed on the surface of the second substrate 12 opposite to the surface facing the first substrate 10. The conductive film 18 covers a liquid crystal drive region (display region) (not shown), and electrostatic shielding is possible. The conductive film 18 also has sides corresponding to the first side S ₁ , the second side S _2, and the third side S ₃ of the second substrate 12. The end surface that defines the thickness of the conductive film 18 may be flush with the end surface that defines the thickness of the second substrate 12. On the conductive film 18, a polarizing plate 20 is attached so as to avoid the end of the conductive film 18.

The end portion of the first substrate 10 has a shape in which corners are notched at a position biased to an end portion having a width along the boundary line between the first portion 14 and the second portion 16. Therefore, the first substrate 10, the end portion, and the fourth side _{S 4} along the boundary line, the fifth side _{S 5} extending in a direction perpendicular to the fourth side _{S 4,} the fourth side _{S 4} and the containing 5 sides _{S 5} and the sixth side _{S 6} that connects diagonally to.

  Pads 22 are formed on the first portion 14 of the first substrate 10. The pad 22 is formed at a position biased to one end of the width in the direction along the boundary line between the first portion 14 and the second portion 16.

  The liquid crystal display device includes a conductive resin 24 that electrically connects the pad 22 and the conductive film 18. The conductive resin 24 is provided on the pad 22 and the conductive film 18 at a position biased to the end of the width in the direction along the boundary line between the first portion 14 and the second portion 16. On the conductive film 18, the height of the conductive resin 24 does not exceed the height of the polarizing plate 20 (see FIG. 2).

The conductive resin 24 is provided so as to be placed on the first side S ₁ , the second side S _2, and the third side S ₃ (and the end surface adjacent thereto) of the second substrate 12. First side S _1, the second side S ₂ and a third side S ₃ extends in a direction crossing each other, the total length of the sides is longer than the prior art consisting of two sides ends perpendicular . Therefore, the contact distance between the conductive resin 24 and the second substrate 12 is increased, the contact strength between the conductive resin 24 and the second substrate 12 is increased, and peeling is less likely to occur.

In the present embodiment, the conductive film 18 also has sides corresponding to the first side S ₁ , the second side S _2, and the third side S ₃ of the second substrate 12. Therefore, since the conductive resin 24 is formed so as to run over the conductive film 18 in three directions, the electrical connection between the conductive resin 24 and the conductive film 18 can be made redundant. For example, even if the conductive resin 24 peels from the conductive film 18 on either side, there is a high possibility that the adhesion between the conductive resin 24 and the conductive film 18 is maintained on the other side, and the conductive resin 24 is conductive in one place. Even if a crack occurs in the conductive resin 24, there is a high possibility that electrical connection is maintained in other places.

The conductive resin 24 is provided so as to be placed on the fourth side S ₄ , the fifth side S _5, and the sixth side S ₆ (and the end surface adjacent thereto) of the first substrate 10. The fourth side S ₄ , the fifth side S _5, and the sixth side S ₆ extend in a direction intersecting each other, and the total length of the side is longer than that of the conventional technique including two sides whose ends are orthogonal to each other. . Therefore, the adhesion area between the conductive resin 24 and the first substrate 10 is increased, the adhesion strength between the conductive resin 24 and the first substrate 10 is increased, and peeling is less likely to occur.

  The conductive resin 24 is also in close contact with the surface of the first substrate 10 opposite to the second substrate 12. Since the conductive resin 24 is integrally provided so as to surround the opposite surfaces of the first substrate 10 and the second substrate 12 and the outside of the side end surfaces, it is difficult to peel off.

  In the process of providing the conductive resin 24, a tank (not shown) containing a liquid or paste-like conductive resin precursor is prepared, and the first substrate 10 on which the pad 22 and the conductive film 18 are formed, and The second substrate 12 (liquid crystal display panel) is immersed obliquely and pulled up. According to this, when the liquid crystal display panel is pulled up, the surplus part drips down, so that the coating amount of the conductive resin precursor can be made uniform, and the minimum necessary amount of the conductive resin precursor due to surface tension can be obtained. The body can be applied.

  It is also possible to store a plurality of liquid crystal display panels in a cassette tray and perform the above process at a time.

(Second Embodiment)
FIG. 5 is a plan view showing a liquid crystal display device according to the second embodiment of the present invention. 6 is a cross-sectional view taken along line VI-VI of the liquid crystal display device shown in FIG.

  The liquid crystal display device includes a frame 26 that supports the first substrate 10 and the second substrate 12. The frame 26 is a resin molded product. A light emitter 28 (LED), a reflective sheet 30, a light guide plate 32, and an optical sheet 34 that constitute a back and a light are attached to the frame 26.

  The frame 26 has a recess 36 that avoids portions of the conductive resin 24 that protrude outward from the first substrate 10 and the second substrate 12. Further, a spacer 38 (for example, a double-sided tape) is interposed between the first substrate 10 and the frame 26 in order to avoid a portion of the conductive resin 24 opposite to the second substrate 12 of the first substrate 10. Yes. The spacer 38 forms a gap between the first substrate 10 and the frame 26. Alternatively, as a modification, a concave portion that avoids a portion of the first substrate 10 opposite to the second substrate 12 of the conductive resin 24 may be formed in the frame 26 itself.

  An IC chip 40 as a liquid crystal drive driver is mounted on the first substrate 10, and a wiring substrate 42 such as a flexible wiring substrate is attached. The wiring board 42 is electrically connected to the IC chip 40 and also to the pad 22. The other configuration corresponds to the content described in the first embodiment.

  FIG. 7 is a plan view showing a modification of the liquid crystal display device according to the second embodiment of the present invention. 8 is a cross-sectional view of the liquid crystal display device shown in FIG. 7 taken along line VIII-VIII.

  In this modification, a conductive tape 44 is connected to a portion of the conductive resin 24 located on the surface of the first substrate 10 opposite to the second substrate 12. The conductive tape 44 is electrically connected by facing and contacting the conductive resin 24. A conductive tape 44 is electrically connected to the wiring substrate 42 attached to the first substrate 10. Thereby, since the conductive film 18 and the wiring substrate 42 are electrically connected, the conductive film 18 on the second substrate 12 can be connected to the GND potential via the wiring substrate 42. In particular, since the conduction by the conductive tape 44 can be achieved from the back surface of the liquid crystal display panel, it is not necessary to form wiring for the surface on the liquid crystal display panel. This contributes to space saving of the first portion 14 of the first substrate 10.

  In FIG. 7, the conductive tape 44 has an L shape and is electrically connected to the wiring board 42, but the wiring board 42 extends in a direction perpendicular to the pulling direction from the first board 10. The electrical connection between them may be achieved by forming them.

(Third embodiment)
FIG. 9 is a cross-sectional view showing a liquid crystal display device according to the third embodiment of the present invention.

  In the present embodiment, the liquid crystal display device includes a metal frame 46, and the metal frame 46 and the conductive tape 144 are electrically connected. The conductive tape 144 is bent along the surface of the frame 126. A part of the conductive tape 144 is located between the frame 126 and the metal frame 46. A convex portion 48 is formed on the metal frame 46 to ensure electrical connection with the conductive tape 144, and the convex portion 48 is in pressure contact with the conductive tape 144.

  According to the present embodiment, since the conductive film 18 is also electrically connected to the metal frame 46 via the conductive resin 24 and the conductive tape 144, a wide GND region can be secured, and further, the metal The frame 46 can be electrically connected to the outside. The other details of the present embodiment correspond to the contents described in the first and second embodiments.

  FIG. 10 is another cross-sectional view of the liquid crystal display device shown in FIG. In the present embodiment, the wiring board 142 attached to the first board 10 and the metal frame 46 are electrically connected. The electrical connection is achieved by the second conductive tape 50. The wiring board 142 is disposed on the opposite side (that is, outside) of the metal frame 46 from the first board 10.

  FIG. 11 is a cross-sectional view showing a modification of the liquid crystal display device shown in FIG. In this modification, the wiring board 242 is disposed between the metal frame 246 and the frame 126. In addition, the convex portion 248 of the metal frame 246 is pressed against the wiring of the wiring board 242 to achieve electrical connection between the two. According to this, it is possible to protect the wiring board 242 by arranging the metal frame 246 outside the wiring board 242.

  The present invention is not limited to the embodiment described above, and various modifications are possible. For example, the configuration described in the embodiment can be replaced with a substantially the same configuration, a configuration that exhibits the same operational effects, or a configuration that can achieve the same purpose.

1 is a plan view showing a liquid crystal display device according to a first embodiment of the present invention. It is the II-II sectional view taken on the line of the liquid crystal display device shown in FIG. It is the III-III sectional view taken on the line of the liquid crystal display device shown in FIG. FIG. 4 is a cross-sectional view taken along line IV-IV of the liquid crystal display device shown in FIG. 1. It is a top view which shows the liquid crystal display device which concerns on the 2nd Embodiment of this invention. FIG. 6 is a cross-sectional view taken along line VI-VI of the liquid crystal display device shown in FIG. 5. It is a top view which shows the modification of the liquid crystal display device which concerns on the 2nd Embodiment of this invention. It is the VIII-VIII sectional view taken on the line of the liquid crystal display device shown in FIG. It is sectional drawing which shows the liquid crystal display device which concerns on the 3rd Embodiment of this invention. FIG. 10 is another cross-sectional view of the liquid crystal display device shown in FIG. 9. It is sectional drawing which shows the modification of the liquid crystal display device shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 1st board | substrate, 12 2nd board | substrate, 14 1st part, 16 2nd part, 18 Conductive film, 20 Polarizing plate, 22 Pad, 24 Conductive resin, 26 Frame, 28 Light emitter, 30 Reflective sheet, 32 Light guide plate , 34 Optical sheet, 36 Concave part, 38 Spacer, 40 Chip, 42 Wiring board, 44 Conductive tape, 46 Metal frame, 48 Convex part, 50 Second conductive tape, 126 Frame, 142 Wiring board, 144 Conductive tape, 242 Wiring Substrate, 246 Metal frame, 248 Convex part.

Claims (10)

A first substrate having a first portion and a second portion;
A second substrate facing the second portion of the first substrate;
A pad formed on the first portion of the first substrate at a position biased to one end of a width in a direction along a boundary line between the first portion and the second portion;
A conductive film formed on a surface of the second substrate opposite to the surface facing the first substrate;
It includes a portion provided on the pad and the conductive film at a position biased to the end of the width, and surrounds the opposite surface of the first substrate and the second substrate and the outside of the side end surface. A conductive resin that electrically connects the pad and the conductive film;
A liquid crystal display device comprising: The liquid crystal display device according to claim 1,
The end of the second substrate has a shape with a corner cut away at a position biased to the end of the width, and is perpendicular to the first side and the first side along the boundary line. A second side extending in a direction, and a third side that obliquely connects the first side and the second side,
The liquid crystal display device, wherein the conductive resin is provided so as to be placed on the first side, the second side, and the third side. The liquid crystal display device according to claim 2,
The end portion of the first substrate has a shape in which a corner is cut out at a position biased to the end portion of the width, and is perpendicular to the fourth side and the fourth side along the boundary line. A fifth side extending in a direction, and a sixth side that obliquely connects the fourth side and the fifth side,
The liquid crystal display device, wherein the conductive resin is provided on the fourth side, the fifth side, and the sixth side. In the liquid crystal display device according to any one of claims 1 to 3,
A frame supporting the first substrate and the second substrate;
The liquid crystal display device according to claim 1, wherein the frame has a recess that avoids portions of the conductive resin that protrude outward from the first substrate and the second substrate. The liquid crystal display device according to claim 4,
The liquid crystal display device further comprising a conductive tape connected to a portion of the conductive resin located on a surface of the first substrate opposite to the second substrate. The liquid crystal display device according to claim 5,
A wiring board attached to the first board;
A liquid crystal display device, wherein the wiring board and the conductive tape are electrically connected. The liquid crystal display device according to claim 5,
A metal frame,
A liquid crystal display device, wherein the metal frame and the conductive tape are electrically connected. The liquid crystal display device according to claim 7,
A wiring board attached to the first board;
A liquid crystal display device, wherein the wiring board and the metal frame are electrically connected. The liquid crystal display device according to claim 8, wherein
The liquid crystal display device, wherein the wiring board is disposed on the opposite side of the metal frame from the first board. The liquid crystal display device according to claim 8, wherein
The liquid crystal display device, wherein the wiring substrate is disposed between the metal frame and the first substrate.

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