JP2013050743A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device for efficiently discharging a potential charged in an IPS mode liquid crystal panel.SOLUTION: A liquid crystal display device includes: an IPS mode liquid crystal panel 20 that has a first substrate 3 having a plurality of a pair of electrodes each having a pixel electrode and a counter electrode, a second substrate 2 that opposes to the first substrate 3 and sandwiches a liquid crystal layer with the first substrate 3, and a polarizing plate 1 arranged on the second substrate 2; a touch panel 7 that is stuck to the polarizing plate 1 with an adhesive layer 11; and a conductive tape 15 that connects a ground electrode formed on a region on the liquid crystal layer side surface of the first substrate 3 excluding a region where the first substrate 3 and the second substrate 2 oppose each other, and a conductive film formed on the second substrate 2 to one another. The touch panel 7 covers the conductive tape arranged on the second substrate 2 in plan view.

Description

  The present invention relates to a liquid crystal display device.

Mobile phone, portable game machine, digital camera, PDA (Personal
Some portable devices such as Digital Assistant) employ a liquid crystal display device in which a liquid crystal panel, a touch panel, and a front window are stacked. This liquid crystal display device has a structure in which a liquid crystal panel and a touch panel are bonded together with an adhesive material, and the touch panel and a front window are bonded together with an adhesive material (hereinafter referred to as “three-stage hybrid structure”).

  Here, a configuration of a liquid crystal display module for a mobile phone, which is an example of a conventional liquid crystal display device having a three-stage hybrid structure, will be described with reference to FIGS.

  FIG. 5 is a view showing a state in which the polarizing plate 1 of the conventional liquid crystal display module for a mobile phone is exposed (a state before the touch panel 7 and the front window 9 are bonded). FIG. 6 is a diagram illustrating a state in which the touch panel 7 is bonded to the polarizing plate 1 illustrated in FIG. 5 (a state before the front window 9 is bonded). FIG. 7 is a top view of a mobile phone liquid crystal display module having a three-stage hybrid structure in which a front window 9 is further bonded to the touch panel 7 shown in FIG. 8 is a cross-sectional view taken along the line VIII-VIII of the liquid crystal display module for a mobile phone shown in FIG. 9 is a cross-sectional view taken along the line IX-IX of the liquid crystal display module for a mobile phone shown in FIG.

  As shown in FIGS. 5 to 9, a conventional liquid crystal display module for a mobile phone includes a liquid crystal panel 20 including glass substrates 2 and 3 sandwiching a liquid crystal layer (not shown) and a polarizing plate 1 disposed on the glass substrate 2. Semiconductor chip 4 mounted on glass substrate 3, FPC (Flexible Printed Circuit: FPC) 5 for liquid crystal panel electrically connected to semiconductor chip 4, resin mold 6 for supporting liquid crystal panel 20, reflection sheet 10 , A capacitive touch panel 7 having a size larger than that of the polarizing plate 1, an FPC 8 for a touch panel, and an adhesive layer (ultraviolet curable adhesive material), which are adhered to the polarizing plate 1 through an adhesive layer (ultraviolet curable adhesive material) 11. ) And a front window 9 that is adhered to the touch panel 7 via 12 and that is larger than the touch panel 7.

  FIG. 10 is a top view of another conventional liquid crystal display module for a mobile phone having a three-stage hybrid structure. FIG. 11 is a cross-sectional view taken along line XI-XI of the mobile phone liquid crystal display module shown in FIG. 12 is a cross-sectional view taken along line XII-XII of the liquid crystal display module for a mobile phone shown in FIG. The mobile phone liquid crystal display module shown in FIGS. 10 to 12 has the same configuration as the mobile phone liquid crystal display module shown in FIGS. 7 to 9 except that it includes a front window 13 having the same size as the polarizing plate 1. Have

JP-A-9-251159 JP 2008-83491 A

  However, the conventional liquid crystal display device has the following problems. Here, a conventional problem will be described by taking the liquid crystal display module for a mobile phone shown in FIGS. 10 to 12 as an example.

  (1) In a conventional mobile phone liquid crystal display module, as shown in FIG. 13A, a rigid liquid crystal panel 20 and a rigid touch panel 7, and a rigid touch panel 7 and a rigid front window 13 are ultraviolet curable. Adhesives 11 and 12 are bonded to each other. However, the ultraviolet curable adhesive materials 11 and 12 before the ultraviolet irradiation do not have an adhesive force enough to correct the warped elastic layer and adhere it to the rigid layer. For this reason, as shown in FIG. 13B, when the ultraviolet curable adhesive materials 11 and 12 are used as a material for bonding the front window 23 formed of an elastic material such as acrylic that easily warps and the rigid touch panel 7, The front window 23 may not be in close contact with the touch panel 7.

  (2) The semiconductor chip 4 is likely to be cracked or damaged due to an impact caused by dropping of the mobile phone. In order to prevent such cracks and breakage, the semiconductor chip 4 may be made as thick as possible. However, if the semiconductor chip 4 is made too thick, on the other hand, when the touch panel 7 extends over the semiconductor chip 4 (see FIG. 11), the liquid crystal panel 20 is inclined and bonded as shown in FIG. The touch panel 7 and the semiconductor chip 4 may come into contact with each other.

  (3) Further, when the touch panel 7 extends to the upper side of the semiconductor chip 4 (see FIG. 11), depending on the pressure applied to the end of the front window 9 or the instantaneous deflection of the front window 9, FIG. As shown, one end (end of the semiconductor chip 4 side) of the touch panel 7 may collide with the upper surface of the semiconductor chip 4 and the semiconductor chip 4 may be damaged.

(4) The liquid crystal panel 20 is IPS (In Plane)
In the case of the switching (transverse electric field switching) method, a conductive film (ITO (Indium Tin Oxide) formed on the upper surface of the glass substrate 2 is discharged in order to discharge a potential charged on the surface of the glass substrate 2 on the touch panel 7 side. In general, a method of directly connecting a conductive resin 14 such as an epoxy resin in which silver powder is kneaded to connect the material) film) and the ground electrode formed on the upper surface of the glass substrate 3 is generally used. However, it is not easy to apply the conductive resin 14 thinly on the glass substrate 2, and the touch panel 7 may come into contact with the conductive resin 14 as shown in FIG. Further, since the conductive resin 14 has a large variation in resistance value and the DC resistance component may exceed several MΩ, the surface of the glass substrate 2 is charged particularly when the touch panel 7 is a capacitive touch panel. The potential may not be discharged efficiently.

  The present invention has been made in view of the above problems, and a first object thereof is to provide a liquid crystal display device in which an elastic layer that is easily warped is adhered to a rigid layer.

  A second object is to provide a liquid crystal display device in which a touch panel bonded to a liquid crystal panel via an adhesive layer does not contact a semiconductor element mounted on the liquid crystal panel.

  A third object is a liquid crystal display device that prevents damage to a semiconductor element caused by one end of a touch panel adhered to the liquid crystal panel via an adhesive layer colliding with an upper surface of the semiconductor element mounted on the liquid crystal panel according to an external force. Is to provide.

  A fourth object is to provide a liquid crystal display device that efficiently discharges a potential charged in an IPS liquid crystal panel.

  (1) In order to solve the above problems, a liquid crystal display device according to the present invention includes an elastic layer, a rigid layer, and a pressure-sensitive adhesive sheet that adheres the elastic layer to the rigid layer.

  According to the present invention, an elastic layer that easily warps can be brought into close contact with the rigid layer.

  In one embodiment of the present invention, the elastic layer is an elastic front window, and the rigid layer is a rigid touch panel. According to this aspect, the elastic front window can be brought into close contact with the rigid touch panel.

  In one embodiment of the present invention, the elastic layer is an elastic touch panel, and the rigid layer is a rigid liquid crystal panel. According to this aspect, the elastic touch panel can be brought into close contact with the rigid liquid crystal panel.

  In addition, in this aspect, it further includes an elastic front window, and another pressure-sensitive adhesive sheet that bonds the elastic front window to the elastic touch panel bonded to the rigid liquid crystal panel via the pressure-sensitive adhesive sheet. But you can. Moreover, a rigid front window and an ultraviolet curable adhesive material for adhering the rigid front window to the elastic touch panel adhered to the rigid liquid crystal panel via the adhesive sheet may be further included.

  In one embodiment of the present invention, the elastic layer is an elastic touch panel, and the rigid layer is a rigid front window. According to this aspect, the elastic touch panel can be brought into close contact with the rigid front window.

  In this aspect, a rigid liquid crystal panel, and an ultraviolet curable adhesive material for adhering the rigid liquid crystal panel to the elastic touch panel adhered to the rigid front window via the adhesive sheet are further provided. May be included.

  Moreover, in 1 aspect of this invention, the said adhesive sheet is a transparent sheet | seat member by which the transparent adhesive material was apply | coated to both surfaces.

  (2) A liquid crystal display device according to the present invention includes a first substrate, a second substrate disposed opposite to the first substrate so as to sandwich a liquid crystal layer together with the first substrate, and the first substrate. Adhering to the polarizing plate via a semiconductor element mounted in a region excluding the region facing the second substrate on the liquid crystal layer side surface, a polarizing plate disposed on the second substrate, and a first adhesive layer Including a touch panel having one end opposed to at least a part of a region where the semiconductor element is mounted, and a front window bonded to the touch panel through a second adhesive layer, and the thickness of the semiconductor element is The thickness of the polarizing plate is smaller than the sum of the thickness of the second substrate.

  According to the present invention, a touch panel bonded to a liquid crystal panel including a first substrate and a second substrate sandwiching a liquid crystal layer, and a polarizing plate via an adhesive layer, and a semiconductor element mounted on the liquid crystal panel, Contact can be prevented. The thickness of the semiconductor element may be smaller than the sum of ½ of the thickness of the polarizing plate and the thickness of the second substrate.

  In one embodiment of the present invention, the thickness of the semiconductor element is larger than the thickness of the second substrate. According to this aspect, it is possible to prevent contact between the touch panel and the semiconductor element while ensuring the strength in the thickness direction of the semiconductor element (for example, crack resistance).

  (3) A liquid crystal display device according to the present invention includes a first substrate, a second substrate disposed opposite to the first substrate so as to sandwich a liquid crystal layer together with the first substrate, and the first substrate. Adhering to the polarizing plate via a semiconductor element mounted in a region excluding the region facing the second substrate on the liquid crystal layer side surface, a polarizing plate disposed on the second substrate, and a first adhesive layer And a front window bonded to the touch panel through a second adhesive layer, and when one end of the touch panel is displaced toward the first substrate, the one end contacts the upper surface of the semiconductor element In other words, one end of the touch panel protrudes beyond a region facing the semiconductor element.

  According to the present invention, one end of the touch panel bonded via the adhesive layer to the liquid crystal panel including the first substrate and the second substrate sandwiching the liquid crystal layer and the polarizing plate is mounted on the liquid crystal panel according to an external force. Damage to the semiconductor element due to collision with the upper surface of the semiconductor element can be prevented.

  (4) A liquid crystal display device according to the present invention is arranged to face a first substrate on which a plurality of pairs of pixel electrodes and counter electrodes are formed, and the first substrate so as to sandwich a liquid crystal layer together with the first substrate. An IPS liquid crystal panel including a second substrate and a polarizing plate disposed on the second substrate, a touch panel bonded to the polarizing plate through an adhesive layer, and a liquid crystal layer of the first substrate A conductive tape electrically connecting a ground electrode formed in a region excluding a region facing the second substrate on the side surface and a conductive film formed on the second substrate. Features.

  According to the present invention, the potential charged in the IPS liquid crystal panel can be discharged efficiently.

  In one embodiment of the present invention, the thickness of the conductive tape is smaller than the thickness of the polarizing plate. According to this aspect, the thickness of the liquid crystal display device can be reduced.

  In one embodiment of the present invention, the conductive tape is thermocompression bonded to the ground electrode and the conductive film, respectively.

  In one embodiment of the present invention, the touch panel is a capacitive touch panel.

It is four schematic sectional drawing of the representative example of the liquid crystal display module for mobile phones which concerns on Embodiment 1 of this invention. It is a fragmentary sectional view of the liquid crystal display module for mobile phones concerning Embodiment 2 of the present invention. It is a fragmentary sectional view of the liquid crystal display module for mobile phones concerning Embodiment 3 of the present invention. It is a fragmentary sectional view of the liquid crystal display module for mobile phones concerning Embodiment 4 of the present invention. It is a figure which shows the state (state before bonding a touch panel and a front window) which the polarizing plate of the liquid crystal display module for conventional mobile phones was exposed. It is a figure which shows the state (state before bonding a front window) which bonded the touch panel on the polarizing plate shown in FIG. FIG. 7 is a top view of a liquid crystal display module for a mobile phone having a three-stage hybrid structure in which a front window is further pasted on the touch panel shown in FIG. 6. It is sectional drawing in the VIII-VIII line of the liquid crystal display module for mobile phones shown in FIG. It is sectional drawing in the IX-IX line of the liquid crystal display module for mobile phones shown in FIG. It is a top view of the other conventional liquid crystal display module for cellular phones having a three-stage hybrid structure. It is sectional drawing in the XI-XI line of the liquid crystal display module for mobile phones shown in FIG. It is sectional drawing in the XII-XII line | wire of the liquid crystal display module for mobile phones shown in FIG. It is a figure explaining the subject of the liquid crystal display module for conventional mobile phones. It is a figure explaining the subject of the liquid crystal display module for conventional mobile phones. It is a figure explaining the subject of the liquid crystal display module for conventional mobile phones. It is a figure explaining the subject of the liquid crystal display module for conventional mobile phones.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same component and duplication description is abbreviate | omitted.

[Embodiment 1]
FIG. 1 is a schematic sectional view of four representative examples of a liquid crystal display module for a mobile phone according to Embodiment 1 of the present invention.

  A liquid crystal display module for a mobile phone shown in FIG. 1A includes a liquid crystal panel (rigid layer) 20 including two glass substrates that sandwich a liquid crystal layer, and a capacitive touch panel (for example, a glass substrate). This is a liquid crystal display device in which a rigid layer 7 and an acrylic front window (elastic layer) 23 are laminated in this order.

  Here, the rigid touch panel 7 is bonded to the rigid liquid crystal panel 20 via the ultraviolet curable adhesive material 11 as in the conventional case. On the other hand, the elastic front window 23 is bonded to the rigid touch panel 7 via an adhesive sheet 30 which is a transparent sheet member having a transparent adhesive material applied on both sides.

  The adhesive sheet 30 has an adhesive force from the beginning to correct the warped elastic layer and adhere it to the rigid body layer, unlike the ultraviolet curable adhesive material in which the adhesive force changes before and after the ultraviolet irradiation. ing. For this reason, the elastic front window 23 that easily warps can be brought into close contact with the rigid touch panel 7.

  A liquid crystal display module for a mobile phone shown in FIG. 1B includes a liquid crystal panel (rigid layer) 20 including two glass substrates sandwiching a liquid crystal layer, and a touch panel (elastic layer) 17 formed of, for example, a resin material. And a liquid crystal display device in which, for example, an acrylic front window (elastic layer) 23 is laminated in this order.

  Here, the elastic touch panel 17 is bonded to the rigid liquid crystal panel 20 via the adhesive sheet 30, and the elastic front window 23 is attached to the elastic touch panel 17 bonded to the rigid liquid crystal panel 20. Is glued through.

  Accordingly, the elastic touch panel 17 that easily warps can be brought into close contact with the rigid liquid crystal panel 20, and the elastic front window 23 that easily warps can be brought into close contact with the elastic touch panel 17 bonded to the rigid liquid crystal panel 20.

  A liquid crystal display module for a mobile phone shown in FIGS. 1C and 1D includes a liquid crystal panel (rigid layer) 20 including two glass substrates that sandwich a liquid crystal layer, and a touch panel (for example, made of a resin material) This is a liquid crystal display device in which an elastic layer) 17 and a front window (rigid layer) 13 made of, for example, tempered glass are laminated in this order.

  In the liquid crystal display module for a mobile phone shown in FIG. 1C, after the elastic touch panel 17 is bonded to the rigid liquid crystal panel 20 via the adhesive sheet 30, the rigid front window 13 is replaced with the rigid liquid crystal panel 20. The elastic touch panel 17 is bonded to the elastic touch panel 17 via the ultraviolet curable adhesive material 12. Since the elastic touch panel 17 becomes a rigid layer by adhering to the rigid liquid crystal panel 20, it is possible to use the ultraviolet curable adhesive material 12 for adhesion between the rigid touch panel 17 and the rigid front window 13. Become.

  On the other hand, in the liquid crystal display module for a mobile phone shown in FIG. 1D, after the elastic touch panel 17 is bonded to the rigid front window 13 via the adhesive sheet 30, the rigid liquid crystal panel 20 is replaced with the rigid front panel. An elastic touch panel 17 bonded to the window 13 is bonded via an ultraviolet curable adhesive material 11. Since the elastic touch panel 17 is bonded to the rigid front window 13 to become a rigid layer, the ultraviolet curable adhesive material 11 can be used for bonding between the rigid touch panel 17 and the rigid liquid crystal panel 20. Become.

  Thereby, the elastic touch panel 17 which is easily warped can be brought into close contact with the rigid liquid crystal panel 20 and the front window 13.

  That is, according to the liquid crystal display module for a mobile phone according to the first embodiment, by using the pressure-sensitive adhesive sheet 30, an elastic layer that is easily warped can be brought into close contact with the rigid layer.

  The present invention is not limited to the liquid crystal display module for mobile phones having the “three-stage hybrid structure” shown in FIGS. 1A to 1D, and includes a rigid layer and an elastic layer bonded to the rigid layer. It can be widely applied to all liquid crystal display devices including

[Embodiment 2]
FIG. 2 is a partial sectional view of a liquid crystal display module for a mobile phone according to Embodiment 2 of the present invention.

  As shown in the figure, the liquid crystal display module for a mobile phone according to the second embodiment includes glass substrates 2 and 3 that sandwich a liquid crystal layer (not shown), and a polarizing plate 1 (thickness 0.1). About 0.14 mm), the semiconductor chip 4 mounted on the glass substrate 3, the FPC 5 for liquid crystal panel electrically connected to the semiconductor chip 4, the resin mold 6 for supporting the liquid crystal panel 20, A touch panel 7 having a size larger than that of the polarizing plate 1, an FPC 8 for a touch panel (not shown), and an adhesive layer (not shown) (not shown), which are adhered to the polarizing plate 1 through a reflective sheet 10 and an adhesive layer (ultraviolet curable adhesive) 11. This is a liquid crystal display device having a “three-stage hybrid structure” including a front window 9 (not shown) bonded to the touch panel 7 via an adhesive material 12.

  The glass substrate 2 is disposed to face the glass substrate 3 so as to sandwich the liquid crystal layer together with the glass substrate 3. A pixel electrode for applying an electric field to the liquid crystal layer is formed on the surface of the glass substrate 2 or the glass substrate 3 on the liquid crystal layer side, and a counter electrode facing the pixel electrode is on the liquid crystal layer side of the glass substrate 3. Formed on the surface.

  The semiconductor chip 4 is mounted in a region excluding the region facing the glass substrate 2 on the surface of the glass substrate 3 on the liquid crystal layer side, and the liquid crystal panel is controlled by controlling the potential applied to the pixel electrode and the counter electrode, respectively. 20 is driven.

  The touch panel 7 is bonded to the polarizing plate 1 through the adhesive layer 11, and one end (end of the semiconductor chip 4) faces at least a part of the region on the glass substrate 3 on which the semiconductor chip 4 is mounted.

  In the present embodiment, the thickness of the semiconductor chip 4 is smaller than the sum of the thickness of the polarizing plate 1 and the thickness of the glass substrate 2. In particular, the thickness of the semiconductor chip 4 is desirably smaller than the sum of the thickness of the polarizing plate 1 and the thickness of the glass substrate 2. Specifically, for example, when the thickness of the polarizing plate 1 is 0.12 mm and the thickness of the glass substrate 2 is 0.2 mm, the thickness of the semiconductor chip 4 is less than 0.26 mm. If the thickness of the polarizing plate 1 is 0.12 mm and the thickness of the glass substrate 2 is 0.25 mm, the thickness of the semiconductor chip 4 is less than 0.31 mm.

  Thereby, as shown in FIG. 2, even if the touch panel 7 is inclined and bonded to the liquid crystal panel 20 via the adhesive layer 11, the distance D1 between one end of the touch panel 7 and the upper surface of the semiconductor chip 4 is less than zero. The contact between the touch panel 7 and the semiconductor chip 4 can be prevented.

  Further, the thickness of the semiconductor chip 4 may be larger than the thickness of the glass substrate 2. If it carries out like this, the contact with the touch panel 7 and the semiconductor chip 4 can be prevented, ensuring the intensity | strength (for example, crack tolerance) of the semiconductor chip 4 in the thickness direction.

  The thickness of the semiconductor chip 4 is determined by the distance D2 between the adhesive layer 11 and the semiconductor chip 4 (generally about 2.5 mm), the length and elastic modulus of the touch panel 7 in the longitudinal direction, and the adhesive layer 11. The thickness may be further determined based on the thickness or the like.

  That is, according to the liquid crystal display module for a mobile phone according to the second embodiment, the touch panel 7 bonded to the liquid crystal panel 20 through the adhesive layer 11 and the semiconductor chip 4 mounted on the glass substrate 3 of the liquid crystal panel 20. , Can prevent contact.

[Embodiment 3]
FIG. 3 is a partial cross-sectional view of a mobile phone liquid crystal display module according to Embodiment 3 of the present invention.

  As shown in the figure, the liquid crystal display module for a mobile phone according to the third embodiment includes a liquid crystal panel 20 including glass substrates 2 and 3 sandwiching a liquid crystal layer (not shown) and a polarizing plate 1 disposed on the glass substrate 2. , Semiconductor chip 4 mounted on glass substrate 3, FPC 5 for liquid crystal panel electrically connected to semiconductor chip 4, resin mold 6 supporting liquid crystal panel 20, reflection sheet 10, adhesive layer (ultraviolet curable adhesive) ) Adhered to the polarizing plate 1 via 11, the touch panel 7 larger in size than the polarizing plate 1, the FPC 8 for touch panel (not shown), and the adhesive layer (ultraviolet curable adhesive material) 12 adhered to the touch panel 7. This is a liquid crystal display device having a “three-stage hybrid structure” including a front window 9 larger than the touch panel 7.

  The glass substrate 2 is disposed to face the glass substrate 3 so as to sandwich the liquid crystal layer together with the glass substrate 3. A pixel electrode for applying an electric field to the liquid crystal layer is formed on the surface of the glass substrate 2 or the glass substrate 3 on the liquid crystal layer side, and a counter electrode facing the pixel electrode is on the liquid crystal layer side of the glass substrate 3. Formed on the surface.

  The semiconductor chip 4 is mounted in a region excluding the region facing the glass substrate 2 on the surface of the glass substrate 3 on the liquid crystal layer side, and the liquid crystal panel is controlled by controlling the potential applied to the pixel electrode and the counter electrode, respectively. 20 is driven. It is assumed that the thickness of the semiconductor chip 4 is smaller than the sum of the thickness of the polarizing plate 1 and the thickness of the glass substrate 2.

  The touch panel 7 is bonded to the polarizing plate 1 through the adhesive layer 11.

  In the present embodiment, the region facing the semiconductor chip 4 has a length D3 so that one end of the touch panel 7 (end on the side of the semiconductor chip 4) is displaced in the direction of the glass substrate 3 so that the one end does not contact the upper surface of the semiconductor chip 4. One end of the touch panel 7 protrudes beyond (D3> 0).

  Thereby, even if one end of the touch panel 7 is largely displaced in the direction of the glass substrate 3 in response to pressure applied to the end of the front window 9 or instantaneous deflection of the front window 9, the touch panel 7 is placed on the upper surface of the semiconductor chip 4. Face contact.

  That is, according to the liquid crystal display module for a mobile phone according to the third embodiment, one end of the touch panel 7 bonded to the liquid crystal panel 20 via the adhesive layer 11 is mounted on the glass substrate 3 of the liquid crystal panel 20 according to an external force. Further, the semiconductor chip 4 can be prevented from being damaged by colliding with the upper surface of the semiconductor chip 4.

[Embodiment 4]
FIG. 4 is a partial cross-sectional view of a mobile phone liquid crystal display module according to Embodiment 4 of the present invention.

  As shown in the figure, the liquid crystal display module for a mobile phone according to the fourth embodiment is an IPS system including glass substrates 2 and 3 sandwiching a liquid crystal layer (not shown) and a polarizing plate 1 disposed on the glass substrate 2. Liquid crystal panel 20, semiconductor chip 4 mounted on glass substrate 3, liquid crystal panel FPC 5 electrically connected to semiconductor chip 4, resin mold 6 that supports liquid crystal panel 20, reflection sheet 10, adhesive layer (ultraviolet curing) Capacitance type touch panel 7 bonded to the polarizing plate 1 through a mold-type adhesive material 11, a touch panel FPC 8 (not shown), and a front window bonded to the touch panel 7 through an adhesive layer (ultraviolet curable adhesive material) 12. 13 and a thermocompression-bonding type conductive tape 15 (for example, a thickness of 80 μm or less) having both ends connected to the glass substrates 2 and 3, respectively. A liquid crystal display device having a stacked hybrid structure ".

  The glass substrate 2 is disposed to face the glass substrate 3 so as to sandwich the liquid crystal layer together with the glass substrate 3. An ITO film connected to the ground potential is formed on the upper surface of the glass substrate 2.

  A transparent conductive film including a plurality of pairs of pixel electrodes and counter electrodes is formed on the surface of the glass substrate 3 on the liquid crystal layer side, and an electric field lateral to the glass substrate 3 is formed on the liquid crystal layer by the transparent conductive film. It is to be applied. A pad-like ground electrode connected to the ground wiring of the liquid crystal panel FPC 5 is formed in a region excluding a region facing the glass substrate 2 on the surface of the glass substrate 3 on the liquid crystal layer side.

  The semiconductor chip 4 is mounted in a region excluding the region facing the glass substrate 2 on the surface of the glass substrate 3 on the liquid crystal layer side, and the potential applied to the pixel electrode and the counter electrode formed on the glass substrate 3, respectively. The liquid crystal panel 20 is driven by controlling the above.

  The touch panel 7 is bonded to the polarizing plate 1 through the adhesive layer 11.

  In the present embodiment, one end of the conductive tape 15 is thermocompression bonded to the ground electrode formed on the glass substrate 3, and the other end is thermocompression bonded to the ITO film formed on the upper surface of the glass substrate 2. Since the conductive tape 15 is thinner than a conductive resin conventionally used as a discharge path, the touch panel 7 does not contact the conductive tape 15. The thickness of the conductive tape 15 may be smaller than the thickness of the polarizing plate 1. In this way, the thickness of the entire liquid crystal display module for mobile phones can be reduced.

  The thermocompression-bonding type conductive tape 15 has little variation in resistance value, and the DC resistance component is about several kΩ. For this reason, compared with the conductive resin conventionally used as a discharge path, the discharge efficiency of the electric potential charged on the surface of the glass substrate 2 is improved.

  That is, according to the liquid crystal display module for a mobile phone according to the fourth embodiment, the potential charged in the IPS liquid crystal panel 20 can be discharged efficiently and the thickness of the entire module can be reduced.

  According to the first to fourth embodiments described above, it is possible to solve a plurality of problems of the conventional mobile phone liquid crystal display module.

  In addition, this invention is not limited to the said Embodiment 1-4. For example, the present invention is not limited to the liquid crystal display module for mobile phones, but can be widely applied to liquid crystal display devices mounted on portable game machines, digital cameras, PDAs, and the like.

  DESCRIPTION OF SYMBOLS 1 Polarizing plate, 2, 3 Glass substrate, 4 Semiconductor chip, 5 FPC for liquid crystal panel, 6 Resin mold, 7 Touch panel (rigid layer), 8 FPC for touch panel, 9, 13 Front window (rigid layer), 10 Reflective sheet, DESCRIPTION OF SYMBOLS 11, 12 Adhesive layer (ultraviolet curable adhesive), 14 Conductive resin, 15 Conductive tape, 17 Touch panel (elastic layer), 20 Liquid crystal panel (rigid layer), 23 Front window (elastic layer), 30 Adhesive sheet.

Claims (4)

A first substrate having a plurality of pairs of electrodes each having a pixel electrode and a counter electrode; a second substrate facing the first substrate and sandwiching a liquid crystal layer with the first substrate; An IPS liquid crystal panel having a polarizing plate disposed on two substrates;
A touch panel adhered to the polarizing plate by an adhesive layer;
A ground electrode formed on a region of the liquid crystal layer side surface of the first substrate excluding a region where the first substrate and the second substrate are opposed to each other, and a conductive material formed on the second substrate A conductive tape connecting the film to each other;
In the plan view, the touch panel covers the conductive tape disposed on the second substrate.   The liquid crystal display device according to claim 1, wherein a thickness of the conductive tape is thinner than a thickness of the polarizing plate.   The liquid crystal display device according to claim 1, wherein the conductive tape is bonded to the ground electrode and the conductive film by thermocompression bonding.   The liquid crystal display device according to claim 1, wherein the touch panel is a capacitive touch panel.

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