JP2011070092A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain an in-cell type touch panel having high sensitivity at a cost as low as possible while suppressing peeling of a sealing material. <P>SOLUTION: The liquid crystal display device includes an active matrix substrate 20a and a counter substrate 30a disposed opposing to each other, a liquid crystal layer 35 between the substrates 20a and 30a, and a sealing material 16 for adhering both substrates 20a, 30a to each other and sealing the liquid crystal layer 35. On the counter substrate 30a, a common electrode 28, a color filter layer 27 and a touch panel layer 22a are successively disposed from the liquid crystal layer 35 side. The sealing material 16 containing conductive particles and having light-shielding property is adhered to the counter substrate 30a in a portion where the color filter layer 27 is not formed. The touch panel layer 22a and the common electrode 28 are each independently connected to a wiring pattern connected to an electronic circuit 41 of the active matrix substrate 20a through the conductive particles of the sealing material 16. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device having a touch panel function.

  The touch panel is mounted on the front surface of a display panel such as a liquid crystal display panel, and is configured to input information interactively to information processing means such as a computer by touching the surface with a finger or a pen. Yes.

  In an external touch panel that has a touch panel on the outside of the display panel as described above, the overall thickness and weight of the device including the display panel increase, so in-cell with a touch panel built into the display panel in recent years. An (In-Cell) type touch panel has been proposed.

  For example, in Patent Document 1, a sensing unit is provided for each pixel, which is the minimum unit of an image, a data driving unit for applying a data voltage of a video signal to each pixel, and a sensing signal is received from the sensing unit. There is disclosed a display device in which a signal reading unit for generating a digital signal and a signal control unit for controlling the data driving unit and the signal reading unit are integrated in one IC (Integrated Circuit) chip.

  Further, Patent Document 2 discloses a liquid crystal display device in which a transparent electrode constituting a touch panel is provided on a counter substrate disposed to face an active matrix substrate.

  Further, in Patent Document 3, a current value flowing through a black matrix provided on a color filter substrate disposed to face an array substrate is measured, and a contact position is determined based on the measured current value. A touch panel device that calculates position coordinates is disclosed.

JP 2006-133786 A International Publication No. 2007/102238 Pamphlet JP 2008-165435 A

  By the way, in a liquid crystal display device in which an active matrix substrate and a counter substrate that are arranged to face each other are bonded together via a sealing material, for example, a colored layer, a black matrix, or the like is formed on the surface of the counter substrate to which the sealing material adheres. If there is a relatively large step due to the resin layer, the sealing material may be peeled off from the counter substrate. In addition, when a touch panel is incorporated in the counter substrate, the sensitivity of the touch panel is reduced, but the transparent electrode for image display (common electrode) and the transparent electrode for the touch panel must be controlled electrically independently. Therefore, it becomes difficult to realize an in-cell touch panel at a low cost.

  The present invention has been made in view of the above points, and an object of the present invention is to realize a high-sensitivity in-cell touch panel with as low cost as possible by suppressing peeling of the sealing material. is there.

  In order to achieve the above-described object, the present invention provides a sealing material that contains conductive particles and has a light shielding property, which is bonded to a portion of the counter substrate without the color filter layer, and the touch panel layer and the common electrode of the counter substrate are The conductive material of the sealing material is connected to the wiring pattern of the active matrix substrate independently of each other.

  Specifically, a liquid crystal display device according to the present invention includes an active matrix substrate having an electronic circuit and a wiring pattern connected to the electronic circuit, a counter substrate provided to face the active matrix substrate, and the active matrix. A liquid crystal layer provided between the substrate and the counter substrate; and a sealing material for adhering the active matrix substrate and the counter substrate to each other and enclosing the liquid crystal layer between the active matrix substrate and the counter substrate. The counter substrate is a liquid crystal display device in which a common electrode, a color filter layer, and a capacitive touch panel layer are provided in order from the liquid crystal layer side, and the sealing material has a light shielding property. In addition, it contains conductive particles and is adhered to a portion of the counter substrate that does not have the color filter layer. Panel layer and the common electrode via the conductive particles of the sealing material, characterized in that it is connected independently of each other in the wiring pattern.

  According to the above configuration, since the common substrate, the color filter layer, and the capacitive touch panel layer are sequentially provided on the counter substrate from the liquid crystal layer side, the in-cell type touch panel is provided inside the liquid crystal display device. Is configured. Here, since the touch panel layer is provided on the counter substrate, the signal line for image display on the active matrix substrate and the touch panel layer are separated from each other, and the touch panel layer is provided on the active matrix substrate. However, noise generation is reduced and the sensitivity of the touch panel is improved. And since the sealing material is bonded not to the stepped portion of the counter substrate due to the color filter layer but to the portion of the counter substrate without the color filter layer, the adhesive strength of the sealing material between the active matrix substrate and the counter substrate is improved. Thus, peeling of the sealing material is suppressed. In addition, since the sealing material has a light-shielding property, the width of the black matrix at the peripheral edge of the color filter layer is reduced in order to provide a portion without the color filter layer for disposing the sealing material on the counter substrate. However, the periphery of the peripheral edge of the color filter layer is shielded by the sealing material, and light leakage at the peripheral edge of the color filter layer is suppressed. Furthermore, since not only the common electrode but also the touch panel layer is connected to the wiring pattern on the active matrix substrate independently through the conductive particles of the sealing material, for example, an electronic circuit such as an IC chip for a touch panel or an FPC Film substrates such as (Flexible Printed Circuit) are no longer necessary, and costs can be reduced. Therefore, peeling of the sealing material is suppressed, and a highly sensitive in-cell type touch panel is realized as low as possible.

  The touch panel layer may have a transparent electrode provided in a rectangular shape with a size larger than the common electrode.

  According to the above configuration, since the touch panel layer has the transparent electrode provided in a rectangular shape with a size larger than the common electrode, a general surface-type capacitive touch panel is specifically provided on the counter substrate. Constructed.

  The touch panel layer includes a plurality of first transparent electrodes provided so as to extend in parallel to each other, and a plurality of second transparent electrodes provided so as to extend in parallel with each other in a direction intersecting with each first transparent electrode, You may have the insulating layer provided between the said some 1st transparent electrode and several 2nd transparent electrode.

  According to the above configuration, the touch panel layer includes a plurality of first transparent electrodes provided to extend in parallel to each other, and a plurality of first transparent electrodes provided to extend in parallel to each other in a direction intersecting each first transparent electrode. Since it has two transparent electrodes and an insulating layer provided between the plurality of first transparent electrodes and the plurality of second transparent electrodes, for example, multi-touch input operated by two fingers is possible A projected capacitive touch panel is specifically configured on the counter substrate.

  The color filter layer may include a black matrix provided in a lattice shape, and the touch panel layer may include a lead wiring provided so as to overlap the black matrix.

  According to the above configuration, the lead-out wiring that configures the touch panel layer is provided, for example, so as to overlap the light-blocking black matrix that does not transmit light from the backlight. A decrease in the aperture ratio is suppressed.

  The electronic circuit may be an integrated circuit chip mounted on the active matrix substrate.

  According to the above configuration, since the electronic circuit is an IC chip mounted on an active matrix substrate, a liquid crystal display device having a COG (Chip On Glass) mounting structure is specifically configured.

  A film substrate for transmitting signals for image display and position detection may be attached to the active matrix substrate.

  According to the above configuration, since the film substrate for transmitting image display and position detection signals is attached to the active matrix substrate, for example, an IC chip for image display and position detection. Not only electronic circuits but also film substrates such as FPC can be used in common, and the cost can be reduced.

  According to the present invention, a sealing material containing conductive particles and having a light shielding property is adhered to a portion of the counter substrate without the color filter layer, and the touch panel layer and the common electrode of the counter substrate are formed of the conductive particles of the sealing material. Since they are independently connected to the wiring pattern of the active matrix substrate through the substrate, it is possible to suppress the peeling of the sealing material and realize a highly sensitive in-cell touch panel at the lowest possible cost. .

3 is a plan view of a liquid crystal display device 50a according to Embodiment 1. FIG. It is sectional drawing of the liquid crystal display device 50a along the II-II line | wire in FIG. It is sectional drawing to which the peripheral part of the liquid crystal display device 50a was expanded. It is the top view to which the peripheral part of the liquid crystal display device 50a was expanded. It is a top view of the touch panel layer 22a which comprises the liquid crystal display device 50a. 6 is a plan view of a liquid crystal display device 50b according to Embodiment 2. FIG. It is sectional drawing of the touchscreen layer 22b which comprises the liquid crystal display device 50b. It is a top view of the 1st transparent electrode layer 24 which constitutes touch panel layer 22b. It is a top view of the 2nd transparent electrode layer 26 which constitutes touch panel layer 22b.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments.

Embodiment 1 of the Invention
1 to 5 show Embodiment 1 of a liquid crystal display device according to the present invention.

  Specifically, FIG. 1 is a plan view of the liquid crystal display device 50a of the present embodiment, and FIG. 2 is a cross-sectional view of the liquid crystal display device 50a along the line II-II in FIG. FIG. 3 is an enlarged cross-sectional view of the peripheral portion of the liquid crystal display device 50a. FIG. 4 is an enlarged plan view of the peripheral edge of the liquid crystal display device 50a.

  As shown in FIGS. 1 to 3, the liquid crystal display device 50a includes an active matrix substrate 20a and a counter substrate 30a provided so as to face each other, and a liquid crystal layer provided between the active matrix substrate 20a and the counter substrate 30a. 35 and a sealing material 36 for adhering the active matrix substrate 20a and the counter substrate 30a to each other and enclosing the liquid crystal layer 35 between the active matrix substrate 20a and the counter substrate 30a.

  As shown in FIGS. 3 and 4, the active matrix substrate 20 a includes an insulating substrate 11 such as a glass substrate, an active matrix layer 12 provided on the insulating substrate 11, wiring patterns 13 a and 13 b, and an active matrix layer 12. And an alignment film (not shown) provided to cover. Further, as shown in FIGS. 1, 2, and 4, an IC chip 41 is mounted as an electronic circuit in the terminal region exposed from the counter substrate 30a of the active matrix substrate 20a, and for image display and position. An FPC 42 is attached as a film substrate for transmitting a detection signal or the like.

  The active matrix layer 12 includes, for example, a plurality of gate lines provided so as to extend in parallel to each other, a plurality of source lines provided so as to extend in parallel to each other in a direction orthogonal to each gate line, each gate line, A plurality of TFTs (Thin Film Transistors) provided at portions where each source line intersects, an interlayer insulating film provided to cover each TFT, and a plurality of TFTs provided in a matrix on the interlayer insulating film And a pixel electrode.

  As shown in FIGS. 4 and 5, the wiring pattern 13 a overlaps with the dislocation portions Ca and Cb of each lead-out wiring 23 b constituting the touch panel layer 22 a described later, and is connected to the IC chip 41 so as to be connected to the IC chip 41. It is made of the same material in the same layer as the metal wiring such as lines and source lines.

  As shown in FIG. 4, the wiring pattern 13 b overlaps with a dislocation portion Cc of a common electrode 28 to be described later, and is connected to the IC chip 41 so as to be on the same layer as the metal wiring such as each gate line and each source line. Are made of the same material.

  The IC chip 41 includes a drive circuit to which each gate line and each source line constituting the active matrix layer 12 are connected, and a position detection circuit for detecting a touched position.

  The counter substrate 30a includes an insulating substrate 21 such as a glass substrate, a touch panel layer 22a provided on the insulating substrate 21, and a color filter layer 27 provided on the touch panel layer 22a, as shown in FIGS. And a common electrode 28 provided so as to cover the color filter layer 27 and an alignment film (not shown) provided so as to cover the common electrode 28.

  As shown in FIG. 5, the touch panel layer 22a includes a transparent electrode 23a having a size larger than the common electrode 28 on the insulating substrate 21 and a rectangular shape, and four electrodes drawn from four corners of the transparent electrode 23a. And a lead-out wiring 23b to form a surface-type capacitive touch panel. FIG. 5 is a plan view of the touch panel layer 22a as viewed from the liquid crystal layer 35 side.

  As shown in FIGS. 3 and 4, the color filter layer 27 includes a black matrix 27d provided in a grid pattern on the touch panel layer 22a, and a red layer 27a and a green layer provided between the grids of the black matrix 27d. 27b and a blue layer 27c, and an overcoat layer 27e provided so as to cover the black matrix 27d, the red layer 27a, the green layer 27b, and the blue layer 27c.

  The liquid crystal layer 35 is made of a nematic liquid crystal material having electro-optical characteristics.

  The sealing material 36 has, for example, a black pigment so as to have a light shielding property, and as shown in FIG. 3, for example, conductive particles 37 such as plastic fine particles having a plating layer formed on the surface thereof are provided. Contains. Here, the average particle diameter of the conductive particles 37 is, for example, about 5 μm, and is smaller than the interval between the wiring patterns 13a. In addition, each lead-out wiring 23b of the touch panel layer 22a is connected to the wiring pattern 13a at the dislocation portions Ca and Cb through the conductive particles 37 in the sealing material 36. Further, the common electrode 28 is connected to the wiring pattern 13b at the dislocation portion Cc through the conductive particles 37 in the sealing material 36.

  The liquid crystal display device 50a having the above configuration applies a predetermined voltage to the liquid crystal layer 35 between the active matrix substrate 20a and the counter substrate 30a via the drive circuit in the IC chip 41, thereby changing the alignment state of the liquid crystal layer 35. By changing the light transmittance for each pixel, which is the minimum unit of the image, image display is performed, and the surface of the counter substrate 30a is touched, whereby the transparent electrode 23a is touched. The capacitance between the four corners of the transparent electrode 23a and the touched position is grounded via the electrostatic capacitance of the human body, and the IC chip is based on the current value flowing through each lead-out wiring 23b at that time. The position detection circuit in 41 is configured to detect the touched position.

  Next, a method for manufacturing the liquid crystal display device 50a of the present embodiment will be described. In addition, the manufacturing method of this embodiment includes an active matrix substrate manufacturing process, a counter substrate manufacturing process, and a substrate bonding process.

<Active matrix substrate manufacturing process>
After forming the active matrix layer 12 and the wiring patterns 13a and 13b by forming gate lines, source lines, TFTs, pixel electrodes and the like on an insulating substrate 11 such as a glass substrate by using a well-known method, An alignment film is formed so as to cover the matrix layer 12, and the active matrix substrate 20a is manufactured.

<Opposite substrate manufacturing process>
First, for example, an ITO (Indium Tin Oxide) film (about 1500 mm thick) is formed on the entire substrate of the insulating substrate 21 such as a glass substrate by a sputtering method using a metal mask to form the transparent electrode 23a. .

  Subsequently, for example, an aluminum film (thickness of about 1000 mm) and a titanium nitride film (thickness of about 1000 mm) are sequentially formed on the entire substrate on which the transparent electrode 23a is formed by sputtering, and then photolithography is used. By patterning, the lead-out wiring 23b is formed and the touch panel layer 22a is formed. The lead-out wiring 23b may be formed by patterning the ITO film constituting the transparent electrode 23a.

  Then, for example, an acrylic photosensitive resin in which a black pigment is dispersed is applied to the entire substrate on which the touch panel layer 22a is formed by spin coating, and the applied photosensitive resin is exposed through a photomask. Thereafter, development is performed to form a black matrix 27d (thickness of about 1.5 μm).

  Subsequently, for example, an acrylic photosensitive resin colored in red, green, or blue is applied to the entire substrate on which the black matrix 27d is formed by a spin coat method, and the applied photosensitive resin is applied to a photomask. Then, patterning is performed by developing to form a colored layer (for example, red layer 27a) of a selected color with a thickness of about 2.0 μm. Further, the same process is repeated for the other two colors to form the other two colored layers (for example, the green layer 27b and the blue layer 27c) to a thickness of about 2.0 μm, and then by spin coating. For example, the color filter layer 27 is formed by applying an acrylic resin to form the overcoat layer 27e.

  Further, for example, an ITO film (thickness of about 1500 mm) is formed on the entire substrate on which the color filter layer 27 is formed by a sputtering method using a metal mask, and the common electrode 28 is formed. An alignment film is formed so as to cover the surface.

  The counter substrate 30a can be manufactured as described above.

<Board bonding process>
First, for example, using a dispenser, the counter substrate 30a manufactured in the above counter substrate manufacturing step is made of a sealing material 36 composed of an ultraviolet curing and thermosetting combined resin containing conductive particles 37 and a black pigment. Is drawn in a frame shape.

  Subsequently, a liquid crystal material is dropped onto a region inside the sealing material in the counter substrate 30a on which the sealing material 36 is drawn.

  The counter substrate 30a onto which the liquid crystal material has been dropped and the active matrix substrate 20a manufactured in the active matrix substrate manufacturing process are bonded together under reduced pressure, and then the bonded body is released to atmospheric pressure. By doing, the surface and the back surface of the bonded body are pressurized.

  Furthermore, after irradiating the sealing material 36 sandwiched between the bonded bodies with UV light, the bonded body is heated to cure the sealing material 36. Thus, the active matrix substrate 20a and the counter substrate 30a are bonded to each other, and the lead-out wirings 23b and the common electrode 28 on the counter substrate 30a are connected to the wiring patterns 13a and 13b on the active matrix substrate 20a, respectively.

  Thereafter, the IC chip 41 is mounted on the terminal area of the active matrix substrate 20a via an ACF (Anisotropic Conductive Film), and the FPC 42 is attached via the ACF.

  As described above, the liquid crystal display device 50a of this embodiment can be manufactured.

  As described above, according to the liquid crystal display device 50a of this embodiment, the common substrate 28, the color filter layer 27, and the surface capacitive touch panel layer are provided on the counter substrate 30a from the liquid crystal layer 35 side. Since 22a is provided in order, an in-cell type touch panel can be configured inside the liquid crystal display device 50a. Here, since the touch panel layer 22a is provided on the counter substrate 30a, a signal line (gate line or source line) for image display on the active matrix substrate 20a and the touch panel layer 22a are separated from each other, and the touch panel layer As compared with the case where is provided on the active matrix substrate, the generation of noise is reduced and the sensitivity of the touch panel can be improved. Since the sealing material 36 is bonded not to the stepped portion of the counter substrate 30a due to the color filter layer 27 but to the portion of the counter substrate 30a where the color filter layer 27 is not present, the sealant 36 is interposed between the active matrix substrate 20a and the counter substrate 30a. The adhesive strength of the sealing material 36 is improved, and peeling of the sealing material 36 can be suppressed. Further, since the sealing material 36 has a light-shielding property, a black matrix at the peripheral portion of the color filter layer 27 is provided in the counter substrate 30a in order to provide a portion without the color filter layer 27 for disposing the sealing material 36. Even if the width 27d is narrowed, the periphery of the peripheral edge of the color filter layer 27 is shielded by the sealing material 36, and light leakage at the peripheral edge of the color filter layer 27 can be suppressed. Furthermore, since not only the common electrode 28 but also the touch panel layer 22a is independently connected to the wiring pattern 13a on the active matrix substrate 20a through the conductive particles 37 of the sealing material 36, an IC chip dedicated to the touch panel, etc. A film substrate such as an electronic circuit or an FPC is not required, and cost can be reduced. Therefore, peeling of the sealing material can be suppressed, and a highly sensitive in-cell type touch panel can be realized at as low a cost as possible.

  Further, according to the liquid crystal display device 50a of the present embodiment, since the lead-out wiring 23b constituting the touch panel layer 22a is provided so as to overlap the light-blocking black matrix 27d that does not transmit light from the backlight, the touch panel. A decrease in the aperture ratio of the pixel due to the arrangement of the layer 22a can be suppressed.

  Further, according to the liquid crystal display device 50a of the present embodiment, the FPC 42 for transmitting image display and position detection signals is attached to the active matrix substrate 20a. Not only an electronic circuit such as an IC chip but also a film substrate such as an FPC can be shared, and the cost can be reduced.

<< Embodiment 2 of the Invention >>
6 to 9 show Embodiment 2 of the liquid crystal display device according to the present invention. Specifically, FIG. 6 is a plan view of the liquid crystal display device 50b of the present embodiment. FIG. 7 is a cross-sectional view of the touch panel layer 22b constituting the liquid crystal display device 50b. Further, FIG. 8 is a plan view of the first transparent electrode layer 24 constituting the touch panel layer 22b, and FIG. 9 is a plan view of the second transparent electrode layer 26 constituting the touch panel layer 22b. In the following embodiments, the same portions as those in FIGS. 1 to 5 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 6, the liquid crystal display device 50b includes an active matrix substrate 20b and a counter substrate 30b provided to face each other, a liquid crystal layer 35 provided between the active matrix substrate 20b and the counter substrate 30b, The active matrix substrate 20b and the counter substrate 30b are bonded to each other, and a sealing material 36 for sealing the liquid crystal layer 35 between the active matrix substrate 20b and the counter substrate 30b is provided.

  Similarly to the active matrix substrate 20a of the first embodiment, the active matrix substrate 20b includes an insulating substrate 11 such as a glass substrate, an active matrix layer 12 and a wiring pattern 13c provided on the insulating substrate 11, and an active matrix layer 12. And an alignment film (not shown) provided so as to cover the surface.

  As shown in FIG. 6, the wiring pattern 13c overlaps the dislocation portions Cd and Ce of each lead-out wiring 24b and the dislocation portions Cf and Cg of each lead-out wiring 26b constituting the touch panel layer 22b, which will be described later. As in the first embodiment, the metal wires such as the gate lines and the source lines are formed of the same material in the same layer so as to be connected.

  Similar to the counter substrate 30a of the first embodiment, the counter substrate 30b includes an insulating substrate 21 such as a glass substrate, a touch panel layer 22b provided on the insulating substrate 21, and a color filter layer provided on the touch panel layer 22b. 27, a common electrode 28 provided so as to cover the color filter layer 27, and an alignment film (not shown) provided so as to cover the common electrode 28.

  As shown in FIG. 7, the touch panel layer 22 b includes a first transparent electrode layer 24 provided on the insulating substrate 21, an insulating layer 25 provided so as to cover the first transparent electrode layer 24, and the insulating layer 25. For example, a projection-type capacitive touch panel capable of multi-touch input operated by two fingers is configured.

  As shown in FIG. 8, the first transparent electrode layer 24 includes a plurality of first transparent electrodes 24a provided in a strip shape so as to extend in parallel with each other on the insulating substrate 21, and one of the first transparent electrodes 23a or And a plurality of lead wires 24b each drawn from the other end. FIG. 8 is a plan view of the first transparent electrode layer 24 as viewed from the liquid crystal layer 35 side.

  As shown in FIG. 9, the second transparent electrode layer 26 has a plurality of second transparent electrodes 26a provided in a strip shape on the insulating layer 25 so as to extend in parallel to each other in a direction orthogonal to the first transparent electrodes 23a. And a plurality of lead wires 26b each drawn from the end of each second transparent electrode 26a. FIG. 9 is a plan view of the second transparent electrode layer 26 as viewed from the liquid crystal layer 35 side.

  The liquid crystal display device 50b having the above configuration applies a predetermined voltage to the liquid crystal layer 35 between the active matrix substrate 20b and the counter substrate 30b via the drive circuit in the IC chip 41, thereby changing the alignment state of the liquid crystal layer 35. By changing the light transmittance for each pixel, which is the minimum unit of the image, to display an image, and by touching the surface of the counter substrate 30b, the first transparent electrode 24a and the first transparent electrode 24a are touched. 2 The transparent electrode 26a is grounded through the capacitance of the human body at the touched position, and the capacitance between the first transparent electrode 24a and the second transparent electrode 26a and the touched position changes. The position detection circuit in the IC chip 41 is configured to detect the touched position based on the current value flowing through each of the lead wires 24b and 26b at that time.

  Next, a method for manufacturing the liquid crystal display device 50b of this embodiment will be described. In addition, the manufacturing method of this embodiment includes an active matrix substrate manufacturing process, a counter substrate manufacturing process, and a substrate bonding process.

<Active matrix substrate manufacturing process>
A gate line, a source line, a TFT, a pixel electrode, and the like are formed on an insulating substrate 11 such as a glass substrate by using a known method, and then an active matrix layer 12 and a wiring pattern 13c are formed. An alignment film is formed so as to cover the layer 12, and the active matrix substrate 20b is manufactured.

<Opposite substrate manufacturing process>
First, for example, an ITO film (thickness of about 1500 mm) is formed on the entire substrate of the insulating substrate 21 such as a glass substrate by sputtering, and then patterned using photolithography to form the first transparent electrode 24a. Form.

  Subsequently, an aluminum film (thickness of about 1000 mm) and a titanium nitride film (thickness of about 1000 mm) are sequentially formed by sputtering on the entire substrate on which the first transparent electrode 24a is formed, and then photolithography is used. By patterning, the lead wiring 24b is formed, and the first transparent electrode layer 24 is formed. The lead wiring 24b may be formed by patterning an ITO film that constitutes the first transparent electrode 24a.

  Then, for example, a silicon nitride film (thickness of about 1500 mm) is formed on the entire substrate on which the first transparent electrode layer 24 is formed by a plasma CVD (Chemical Vapor Deposition) method. The insulating layer 25 is formed by patterning so that the dislocation portions Cd and Ce of the lead wiring 24b are exposed.

  Further, an ITO film (thickness of about 1500 mm) is formed on the entire substrate on which the insulating layer 25 is formed by sputtering, for example, and then patterned using photolithography to form the second transparent electrode 26a. To do.

  Subsequently, after an aluminum film (thickness of about 1000 mm) and a titanium nitride film (thickness of about 1000 mm) are sequentially formed on the entire substrate on which the second transparent electrode 26a is formed by sputtering, photolithography is used. By patterning, the lead wiring 26b is formed, and the second transparent electrode layer 26 and the touch panel layer 22b are formed. The lead wiring 26b may be formed by patterning the ITO film constituting the second transparent electrode 26a.

  Thereafter, similarly to the first embodiment, the color filter layer 27, the common electrode 28, and the alignment film are formed.

  The counter substrate 30b can be manufactured as described above.

<Board bonding process>
First, for example, using a dispenser, the counter substrate 30b manufactured in the counter substrate manufacturing step is formed of a sealing material 36 composed of an ultraviolet curing and thermosetting combined resin containing conductive particles 37 and a black pigment. Is drawn in a frame shape.

  Subsequently, a liquid crystal material is dropped onto a region inside the sealing material in the counter substrate 30b on which the sealing material 36 is drawn.

  Then, the counter substrate 30b onto which the liquid crystal material is dropped and the active matrix substrate 20b manufactured in the active matrix substrate manufacturing step are bonded together under reduced pressure, and then the bonded body is released to atmospheric pressure. By doing, the surface and the back surface of the bonded body are pressurized.

  Furthermore, after irradiating the sealing material 36 sandwiched between the bonded bodies with UV light, the bonded body is heated to cure the sealing material 36. As a result, the active matrix substrate 20b and the counter substrate 30b are bonded to each other, and the lead wirings 24b and 26b and the common electrode 28 on the counter substrate 30b are connected to the wiring pattern 13c on the active matrix substrate 20b.

  Thereafter, the IC chip 41 is mounted on the terminal area of the active matrix substrate 20b via the ACF, and the FPC 42 is attached via the ACF.

  As described above, the liquid crystal display device 50b of this embodiment can be manufactured.

  As described above, according to the liquid crystal display device 50b of the present embodiment, the common electrode 28 and the color filter layer are formed on the counter substrate 30b from the liquid crystal layer 35 side, similarly to the liquid crystal display device 50a of the first embodiment. 27 and the projected capacitive touch panel layer 22b are provided in order, so that an in-cell touch panel can be formed inside the liquid crystal display device 50b. Here, since the touch panel layer 22b is provided on the counter substrate 30b, a signal line (gate line or source line) for image display on the active matrix substrate 20b and the touch panel layer 22b are separated from each other, and the touch panel layer As compared with the case where is provided on the active matrix substrate, the generation of noise is reduced and the sensitivity of the touch panel can be improved. Since the sealing material 36 is bonded not to the stepped portion of the counter substrate 30b due to the color filter layer 27 but to the portion of the counter substrate 30b where the color filter layer 27 is not present, the sealant 36 is interposed between the active matrix substrate 20b and the counter substrate 30b. The adhesive strength of the sealing material 36 is improved, and peeling of the sealing material 36 can be suppressed. Further, since the sealing material 36 has a light shielding property, a black matrix at the peripheral portion of the color filter layer 27 is provided in the counter substrate 30b in order to provide a portion without the color filter layer 27 for disposing the sealing material 36. Even if the width 27d is narrowed, the periphery of the peripheral edge of the color filter layer 27 is shielded by the sealing material 36, and light leakage at the peripheral edge of the color filter layer 27 can be suppressed. Furthermore, since not only the common electrode 28 but also the touch panel layer 22b is connected to the wiring pattern 13c on the active matrix substrate 20b through the conductive particles 37 of the sealing material 36 independently of each other, an IC chip dedicated to the touch panel, etc. A film substrate such as an electronic circuit or an FPC is not required, and cost can be reduced. Therefore, peeling of the sealing material can be suppressed, and a highly sensitive in-cell type touch panel can be realized at as low a cost as possible.

  In each of the above embodiments, the liquid crystal display device having a COG (Chip On Glass) mounting structure on which the IC chip 41 is mounted is exemplified, but the present invention is a liquid crystal display in which a monolithic electronic circuit is formed on an active matrix substrate. It can also be applied to devices.

  In each of the above embodiments, an active matrix drive type liquid crystal display device is illustrated, but the present invention is also applied to other display devices such as a passive matrix drive type liquid crystal display device and an organic EL (Electro Luminescence) display device. be able to.

  As described above, the present invention can suppress peeling of the sealing material and realize a highly sensitive in-cell touch panel at as low a cost as possible, which is useful for a liquid crystal display device for mobile use. It is.

13a, 13b, 13c Wiring patterns 20a, 20b Active matrix substrates 22a, 22b Touch panel layer 23a Transparent electrodes 23b, 24b, 26b Lead wiring 24a First transparent electrode 25 Insulating layer 26a Second transparent electrode 27 Color filter layer 27d Black matrix 28 Common Electrodes 30a, 30b Counter substrate 35 Liquid crystal layer 36 Sealing material 37 Conductive particles 41 IC chip (electronic circuit)
42 FPC (film substrate)
50a, 50b liquid crystal display device

Claims (6)

An active matrix substrate having an electronic circuit and a wiring pattern connected to the electronic circuit;
A counter substrate provided to face the active matrix substrate;
A liquid crystal layer provided between the active matrix substrate and the counter substrate;
A sealant for adhering the active matrix substrate and the counter substrate to each other and enclosing the liquid crystal layer between the active matrix substrate and the counter substrate;
The counter substrate is a liquid crystal display device in which a common electrode, a color filter layer, and a capacitive touch panel layer are sequentially provided from the liquid crystal layer side,
The sealing material has light shielding properties and contains conductive particles, and is adhered to a portion of the counter substrate where the color filter layer is not provided.
The liquid crystal display device, wherein the touch panel layer and the common electrode are independently connected to the wiring pattern through conductive particles of the sealing material. The liquid crystal display device according to claim 1,
The liquid crystal display device, wherein the touch panel layer has a transparent electrode provided in a rectangular shape with a size larger than the common electrode. The liquid crystal display device according to claim 1,
The touch panel layer includes a plurality of first transparent electrodes provided so as to extend in parallel to each other, and a plurality of second transparent electrodes provided so as to extend in parallel with each other in a direction intersecting with each first transparent electrode, A liquid crystal display device comprising: an insulating layer provided between the plurality of first transparent electrodes and the plurality of second transparent electrodes. The liquid crystal display device according to any one of claims 1 to 3,
The color filter layer has a black matrix provided in a lattice shape,
The liquid crystal display device, wherein the touch panel layer has a lead wiring provided so as to overlap with a black matrix. The liquid crystal display device according to any one of claims 1 to 4,
The liquid crystal display device, wherein the electronic circuit is an integrated circuit chip mounted on the active matrix substrate. The liquid crystal display device according to any one of claims 1 to 5,
A liquid crystal display device, wherein a film substrate for transmitting signals for image display and position detection is attached to the active matrix substrate.

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