JP2017142382A - Color filter substrate with electrode and liquid crystal display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure with a high yield while avoiding complicated processes, particularly capable of responding to a demand for reducing thickness of a liquid crystal cell, and to provide a color filter substrate with an electrode, which stably operates, generally for the purpose of a tough sensor function, and a liquid crystal display including a touch sensor function.SOLUTION: The color filter substrate with an electrode includes at least a transparent substrate 1, a first electrode 2, a first transparent insulation layer 3 and a color filter layer 150 in the described order. The color filter layer 150 includes a black resin 4, a second electrode 5, a colored resin 6 and a protective layer 7. A surface of the color filter substrate 100 opposite to the transparent substrate 1 is covered with the protective layer 7 except for a certain part. The first electrode 2 and the second electrode 5 comprise a plurality of patterned electrodes extending in directions orthogonal to each other, in which the first electrode 2 is covered with the first transparent insulation layer 3 except for a certain part, and the second electrode 5 is disposed at a position overlapping a pattern of the black resin 4. The protective layer 7 has an opening that does not cover the first electrode 2 or the second electrode 5.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a color filter substrate with electrodes and a liquid crystal display using the same. The electrode of the color filter with an electrode of the present invention acts as an electrode of a capacitive touch sensor to provide a touch sensor built-in type liquid crystal display.

  In recent years, transparent touch panels have been used as input devices on displays of various electronic devices. Examples of the touch panel system include a resistance film type and a capacitance type. In the resistive film type, the touch position is detected by contacting the upper and lower electrodes. In the capacitance type, the touch position is detected by a change in the surface capacitance when a fingertip or the like touches.

  A sensor for a capacitive touch panel is generally used as an out-cell structure that is manufactured as an electrode pattern on a resin substrate such as a PET film or a glass substrate and is arranged outside the display structure. (For example, see Patent Document 1)

  On the other hand, recently, an in-cell structure or an on-cell structure in which a touch sensor is incorporated into a display structure has begun to be adopted, and efforts have been made to make the display with a touch sensor thinner and lighter. (For example, see Patent Document 2, Patent Document 3, Patent Document 4, and Patent Document 5)

JP 2007-178758 A Japanese Patent No. 4816668 Japanese Patent No. 4584342 JP 2014-063484 A JP 2015-1111318 A JP-A-6-273936 Japanese Patent Laid-Open No. 10-98266 Japanese Patent Laid-Open No. 2003-122004 JP 48-89003 A JP 60-3625 A JP 63-27829 A

  However, it has been pointed out that the in-cell structure requires the touch sensor circuit to be incorporated in the TFT substrate, which is a display display drive circuit, and that the design and process are complicated and the yield of non-defective products is accompanied by this. Patent Documents 3 and 5). In addition, the on-cell structure, especially in the case of liquid crystal displays, has a problem in process design that takes into account damage to the liquid crystal due to process conditions such as heat because the touch sensor is formed in the state of the cell in which the liquid crystal is sealed, and has become thinner. The yield of non-defective products has deteriorated due to the complicated touch sensor formation process for the liquid crystal cell (see Patent Document 2 and Patent Document 4).

  Accordingly, the present invention provides a structure that can avoid complicated processes and has a high yield, and in particular, can cope with the thinning of the liquid crystal cell thickness. The color filter substrate with electrodes mainly for the touch sensor function that operates stably, and the touch A liquid crystal display with a built-in sensor function is provided.

The color filter substrate with an electrode of the present invention comprises at least a transparent substrate, a first electrode, a first transparent insulating layer, and a color filter layer in this order,
The color filter layer includes a black resin, a second electrode, a colored resin, a protective layer,
The surface located on the opposite side of the transparent substrate of the color filter substrate is covered with the protective layer except for a part thereof,
The first electrode and the second electrode are composed of a plurality of patterned electrodes extending in directions perpendicular to each other,
The first electrode is covered with the first transparent insulating layer except for a part,
The second electrode is disposed at a position overlapping the black resin pattern,
The protective layer has an opening that does not cover the first electrode or the second electrode.

  In one embodiment of the present invention, the first transparent insulating layer preferably has a thickness of 1 to 25 μm, a relative dielectric constant of 3.3 or less, and a refractive index of 1.60 or more and 2.00 or less. There may be.

  Further, in another embodiment of the present invention, the plurality of patterned electrodes of the first electrode have a dummy pattern that is not electrically connected between the electrodes, and the first electrode and the dummy pattern have the first electrode The pitch of the shape that continues in the direction in which one electrode extends is the same as the pitch that continues in the direction in which the first electrode of the black resin extends.

  In one embodiment of the present invention, the first transparent insulating layer may have an opening that does not cover the first electrode, and the opening that does not cover the first electrode of the first transparent insulating layer is a protective layer. The second electrode may be disposed at the same position as the opening that does not cover the second electrode. Furthermore, the first conductive layer made of the same material as the second electrode may be formed on the opening of the first transparent insulating layer that does not cover the first electrode.

  In another embodiment of the present invention, the protective layer may have an opening that does not cover the first conductive layer, and the opening that does not cover the first electrode or the second electrode of the protective layer or the first conductive layer. The part further includes a second conductive layer laminated on the first conductive layer, and the second conductive layer can be electrically connected to the first electrode, the second electrode, or the first conductive layer.

  Further, in one embodiment of the present invention, a spacer is further formed on the protective layer, the spacer is disposed at a position overlapping with the black resin, and from the surface opposite to the protective layer of the transparent substrate to the apex of the spacer. The distance may be equal to or shorter than the distance from the surface of the protective layer opposite to the transparent substrate to the vertex of the second conductive layer.

  Furthermore, the present invention relates to a display device using the color filter substrate with electrodes. In one embodiment of the present invention, the display device is a liquid crystal display, and (i) a TFT substrate having at least a common electrode and a pixel electrode and having a thin film transistor for lighting a display; (ii) a color filter substrate with an electrode; (Iii) an alignment film formed on the pixel electrode of the TFT substrate and on the protective layer of the color filter substrate with an electrode; and (iv) a liquid crystal, and the first electrode and the second electrode of the color filter substrate with an electrode are Provided is a liquid crystal display with a built-in touch panel that acts as a touch sensor. Preferably, the pixel electrode of the TFT substrate and the second electrode of the color filter substrate are present at a position where they do not overlap when observed from the transparent base material in the stacking direction of the substrate. Further, the first electrode or the second electrode may be electrically connected to a wiring formed on the TFT substrate.

  In another embodiment of the present invention, the present invention provides a liquid crystal display using the above-described color filter substrate with an electrode, comprising at least a common electrode and a pixel electrode, a TFT substrate having a thin film transistor for lighting a display, A color filter substrate with electrodes; an alignment film formed on a pixel electrode of the TFT substrate and a protective layer of the color filter substrate with electrodes; and a liquid crystal, and a first electrode and a second electrode of the color filter substrate with electrodes A liquid crystal display with a built-in touch panel in which an electrode functions as a touch sensor, wherein the first electrode or the second electrode is electrically connected to the wiring formed on the TFT substrate via the second conductive layer, The conductive layer is an adhesive mixed with silver paste or polymer fine particles having a metal layer on the surface.

  Preferably, the liquid crystal of the present invention is an IPS liquid crystal or an FFS liquid crystal whose orientation direction is controlled by a lateral electric field or a fringe electric field, and may have a negative dielectric anisotropy.

  In another embodiment of the present invention, both the touch sensor and the TFT drive circuit are connected to a driver LSI mounted on the TFT substrate via wiring on the TFT substrate, and the driver LSI is connected to the liquid crystal display and touch. It may be an integrated driver LSI that operates each sensor drive.

  In the present invention, the thickness of either the transparent substrate or the substrate used for the TFT substrate can be less than 150 μm.

  According to the present invention, a color filter substrate with an electrode mainly for a touch sensor function that stably operates and provides a structure capable of avoiding complicated processes and having a high yield, particularly capable of dealing with thinning of the liquid crystal cell thickness, and A liquid crystal display with a built-in touch sensor function is provided.

An example of the top view which represented typically the electrode arrangement | positioning of the color filter substrate with an electrode in the Example of this invention is shown. An example of the sectional view of the part corresponding to the dotted line A of Drawing 1 of the color filter substrate with an electrode in the example of practice of the present invention is shown. An example of the sectional view of the portion corresponding to the dotted line B of Drawing 1 of the color filter substrate with an electrode in the example of practice of the present invention is shown. The example of typical sectional drawing of the liquid crystal cell in the Example of this invention is shown. The example of the typical fragmentary sectional view showing the structure which electrically connected the 1st electrode of the color filter substrate with an electrode in the Example of this invention with the 2nd conductive layer is shown. The example of typical fragmentary sectional drawing showing the structure which electrically connected the 2nd electrode of the color filter substrate with an electrode in the Example of this invention with the 2nd conductive layer is shown. The example of the typical fragmentary sectional view showing the structure which electrically connected the 1st electrode of the color filter substrate with an electrode in the Example of this invention with the 1st wiring on a TFT substrate via a 2nd conductive layer is shown. The example of the typical fragmentary sectional view showing the structure which electrically connected the 2nd electrode of the color filter substrate with an electrode in the Example of this invention with the 2nd wiring on a TFT substrate via a 2nd conductive layer is shown. The example of typical sectional drawing of the liquid crystal display in the Example of this invention is shown.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The following embodiment is merely an example of the present invention, and those skilled in the art can change the design as appropriate.

[Color filter substrate with electrodes]
The color filter substrate 100 with an electrode of the present invention includes a first transparent substrate 1, a first electrode 2, a first transparent insulating layer 3, a black resin 4, a second electrode 5, a colored resin 6, and a protective layer 7, and is colored. It functions as a color filter that transmits light of a color corresponding to the resin (see FIGS. 1 to 3). Furthermore, the color filter substrate 100 with an electrode of the present invention can provide the display cell 300 by combining with the liquid crystal 17 and the TFT substrate 200 as shown in FIG.

<Transparent substrate>
The first transparent substrate 1 and the second transparent substrate 16 are not particularly limited as long as they have sufficient strength in the film forming step and the subsequent step, have excellent transparency, and have good surface smoothness. As the first transparent substrate 1 and the second transparent substrate 16, glass or a plastic film can be used. As the glass, alkali-free glass for display is preferably used. Examples of the plastic film include a polycarbonate film, a polyethersulfone film, a polysulfone film, a polyarylate film, a cyclic polyolefin film, and a polyimide film. Moreover, since the 1st transparent base material 1 and the 2nd transparent base material 16 are typically used for the color filter and TFT substrate of a display apparatus, they have high transparency. Preferably, the total light transmittance is 85% or more. Moreover, it is preferable to have a very low retardation, and those having a retardation Rth in the depth direction of 10 nm or less are suitably used. The first transparent substrate 1 and the second transparent substrate 16 may be subjected to corona treatment, low-temperature plasma treatment, ion bombardment treatment, chemical treatment, etc. as pretreatment in order to improve adhesion with each layer.

<First electrode>
The 1st electrode 2 forms the electrode of a touch sensor part with the 2nd electrode 5 mentioned later. A substantially transparent conductive material can be used for the first electrode 2. For example, a thin film such as indium tin oxide (ITO) patterned, a silver nanowire coated and patterned, or a metal material such as copper or silver patterned in mesh be able to. As other materials, tin oxide or zinc oxide to which a doping material is added, carbon nanotubes, conductive polymers, and the like can also be used. A laminated structure in which the upper and lower sides of a silver thin film are sandwiched between metal oxides such as ITO can also be used. When ITO is used as the first electrode 2, the content ratio of tin oxide doped in indium oxide may be selected in any proportion according to the specifications required for the device. For example, when the thin film is crystallized for the purpose of increasing mechanical strength, the sputtering target material used preferably has a tin oxide content of less than 10% by weight. On the other hand, in order to make the thin film amorphous and have flexibility, the content ratio of tin oxide is preferably 10% by weight or more. Moreover, when low resistance is calculated | required by a thin film, the content rate of a tin oxide has the preferable range of 2 to 20 weight%.

  As a manufacturing method when a thin film such as ITO is used as the first electrode 2, any film forming method can be used as long as the film thickness can be controlled. Among them, physical vapor deposition such as dry vacuum deposition and sputtering is possible. A chemical vapor deposition method such as a CVD method or a CVD method can be preferably used. In particular, in order to form a thin film having a uniform film quality over a large area, a sputtering method in which the process is stable and the thin film becomes dense is preferable.

  When materials such as silver nanowires, carbon nanotubes, graphene, and conductive polymers are used as the first electrode 2, they can be dissolved or dispersed in an organic solvent, alcohol, water, etc., and then desired by coating and drying. An electrode having the following shape can be formed. Specifically, a known coating method such as spray coating, bar coating, roll coating, die coating, ink jet coating, screen coating, dip coating can be used. The formed silver nanowires are entangled with each other to form a network, so that even with a small amount of conductive material, a good electrical conduction path can be formed and the resistance value can be further reduced. Furthermore, when such a mesh-like shape is formed, since the opening of the gap portion of the mesh is large, even if the fibrous conductive material itself is not transparent, it achieves good transparency as a coating film. Is possible.

  In addition, when a metal material such as copper or silver is used for the first electrode 2 by patterning in a mesh shape, a film having a large opening is formed by etching in advance by sputtering or by attaching a metal foil. It can be formed by patterning. Instead of copper or silver, aluminum is also preferably used as another material. Since the line width and aperture ratio of the mesh affect the transmittance and pattern exposure, it is preferable to set the line width to 5 μm or less and the aperture ratio to be 90% or more. Further, since the outermost surface of the metal mesh is easily recognized by light reflection, an antireflection layer or a light shielding layer may be provided. Preferably, it can provide so that the surface reflectance of the 1st electrode 2 may be 20% or less.

  If the film thickness of the first electrode 2 is too thin, sufficient conductivity as a conductor tends not to be achieved. If it is too thick, transparency tends to be impaired due to an increase in haze value, a decrease in total light transmittance, and the like. . For example, it is formed with a film thickness of 10 nm to 500 nm, but is not limited thereto. When the material of the first electrode 2 is not transparent like metal nanowires, the transparency is easily lost due to the increase in the film thickness, and it is preferable that a thinner conductive layer is formed. In this case, while increasing the area of the opening, the average film thickness is preferably 10 nm to 500 nm, more preferably 30 nm to 300 nm, and most preferably 50 nm to 150 nm when measured with a contact-type film thickness meter.

<First transparent insulating layer>
The first transparent insulating layer 3 is formed at a position sandwiched between the first electrode 2 and the second electrode 5. When the first electrode 2 and the second electrode 5 are used as a capacitive touch sensor, the capacitance between the electrodes It becomes one of the layers that decides.

  The interelectrode capacitance is an important parameter of the capacitive touch sensor, and is a value determined by the overlapping area of the electrodes, the interelectrode distance, and the dielectric constant of the interelectrode insulating layer. Since the touch sensing sensitivity deteriorates when the interelectrode capacitance becomes too large, the relative dielectric constant of the first transparent insulating layer 3 is preferably 3.3 or less. Further, in order to suppress the exposure of the pattern of the first electrode 2 and obtain a sufficient light transmittance, the refractive index of the first transparent insulating layer 3 is preferably 1.60 or more and 2.00 or less.

  The first transparent insulating layer 3 can be made of a material that is transparent and excellent in insulation, can be patterned, and has excellent surface flatness.

  When using a resin material, for example, a photosensitive resin may be exposed and cured to form. The photosensitive resin may be a negative photosensitive resin or a positive photosensitive resin. The negative photosensitive resin is generally composed of a binder material, a photopolymerizable material, and a material containing at least a photopolymerization initiator, but is not particularly limited. For example, the materials described in Patent Documents 6 to 8 can be used as the negative photosensitive resin. The positive photosensitive resin is generally formed from a material containing an alkali-soluble resin material, a photoacid generating material, an acid-decomposable functional group-containing compound, etc., but is not particularly limited. As the positive photosensitive resin, for example, materials described in Patent Documents 9 to 11 can be used.

  The photosensitive resin is dried after applying the above materials by a known coating method such as a die coater, curtain flow coater, roll coater, reverse roll coater, gravure coater, knife coater, bar coater, spin coater, micro gravure coater, etc. Thus, a film can be formed. Furthermore, light irradiation through a photomask produces a part soluble in the developer and an insoluble part. A portion soluble in the developer of the photosensitive resin is dissolved by development, and a pattern composed of an insoluble portion can be formed. The developer can be appropriately selected depending on the kind of the photosensitive resin or its material, and can generally be an alkaline aqueous solution or an organic solvent.

When an inorganic material is used for the first transparent insulating layer 3, for example, silicon nitride, silicon oxynitride, or aluminum oxide can be used. For the formation of the first transparent insulating layer 3 using these inorganic materials, a dry vapor deposition method, a physical vapor deposition method such as sputtering, or a chemical vapor deposition method such as a CVD method can be suitably used. . In particular, a CVD method that can form a dense thin film having excellent insulating properties and high flatness is preferably used, but an atomic layer deposition method (ALD method) that has recently been developed may be used. For the patterning of these inorganic materials, a dry etching method using plasma containing a corrosive gas such as CF ₄ or Cl ₂ can be used, although not limited thereto.

  When the color filter substrate with electrodes of the present invention is used as a liquid crystal display, the first transparent insulating layer 3 determines the distance between the first electrode 2 and the pixel electrode 13 on the TFT substrate that determines the liquid crystal alignment. There are black resin 4, colored resin 6, protective layer 7, liquid crystal 17 and the like that determine the distance between the electrodes, but these shapes are optimal for liquid crystal display transmittance, chromaticity, color mixture between pixels, and viewing angle. The layer thickness cannot be changed flexibly. Therefore, in the present invention, the distance between the first electrode 2 and the pixel electrode 13 is adjusted by the first transparent insulating layer 3.

  The thickness of the first transparent insulating layer 3 is preferably 1 to 25 μm, more preferably 1 to 10 μm, although it depends on the properties of the material to be formed such as dielectric constant. If the first transparent insulating layer 3 is too thin, the parasitic capacitance increases due to coupling with the electrode on the TFT substrate, the touch sensor and the liquid crystal drive become difficult to control, and the electric field generated between the pixel electrode and the common electrode is disturbed. It becomes difficult to control the alignment of the liquid crystal. On the other hand, if it is too thick, the layer thickness of the color filter substrate becomes thick, and the patterning and alignment process becomes difficult.

<Color filter layer>
A color filter layer 150 is formed on the first transparent insulating layer 3. The color filter layer 150 is a layer including at least a black matrix made of the black resin 4 and colored resins 6 of red, green, and blue colors. The color filter layer 150 is divided by a black matrix, and each of the openings of the black matrix forms a sub-pixel 41 that holds the colored resin 6.

  Each resin constituting the color filter layer 150 can be formed, for example, by applying a colored photosensitive ink by a method such as spin coating, spinless coating, or inkjet, and then exposing and baking. The black resin 4 is formed of, for example, an acrylic resin having a thickness of 0.5 to 3.0 μm in which a black pigment is dispersed. The colored resin 6 may be formed of, for example, an acrylic resin having a thickness of 0.5 to 3.0 μm in which pigments of red, green, and blue are dispersed. As the colored resin 6, a yellow, cyan, magenta, or white (colorless) layer may be used.

  Further, the protective layer 7 is formed on the color filter layer 150 for the purpose of planarization and protection. Further, a transparent electrode may be formed so as to cover the black matrix and the colored resin layer.

<Second electrode>
The second electrode 5 forms an electrode of the touch sensor unit together with the first electrode 2. The second electrode 5 is not particularly limited as long as it has sufficient conductivity as an electrode.

  Specifically, a metal material having excellent conductivity can be used for the second electrode 5. For example, copper, silver, gold, aluminum, molybdenum, or an alloy obtained by adding a different element to these materials is several tens of nm. A thin film having a thickness of ˜1 μm can be used. The method for forming the second electrode 5 may be any film forming method as long as the film thickness can be controlled in the same manner as the first electrode 2, and the dry thin film forming method is particularly preferable. For this, a vacuum vapor deposition method, a physical vapor deposition method such as sputtering, or a chemical vapor deposition method such as a CVD method can be used. In particular, in order to form a thin film having a uniform film quality over a large area, a sputtering method in which the process is stable and the thin film becomes dense is preferable.

  The second electrode 5 may be formed by conducting a conductive treatment on a metal material precursor. The precursor of the metal material is mainly composed of metal nanoparticles having a particle diameter of 100 nm or less, for example, metal nanoparticles having a particle diameter of 60 nm, metal oxide nanoparticles, or submicron to several μm size, or flaky, fibrous or powdery particles. Ink, paste or dispersion, or ink containing a metal complex, solution, or the like can be used. The concentration (solid content concentration) of the metal material precursor, such as ink, is 10 wt% or more and 90 wt% or less, for example, 50 wt%, based on the precursor material. As the metal, preferably, at least one element selected from the group consisting of gold, silver, copper, aluminum, iron, titanium, molybdenum, indium, tin, and niobium can be used. In the case of using a metal oxide, indium tin oxide is preferably used, and tin oxide, zinc oxide and the like can also be used.

  The ink of the precursor of the metal material is applied by a known coating method such as a die coater, curtain flow coater, roll coater, reverse roll coater, gravure coater, knife coater, bar coater, spin coater, micro gravure coater, The second electrode 5 is formed by becoming conductive by firing. The firing method can be appropriately selected according to the material and properties of the precursor. A hot air oven, an IR heater, a hot plate, or the like can be used for the thermal firing, and a xenon flash lamp is generally used for the light firing. Moreover, you may provide electroconductivity by a chemical | medical solution process.

  The metal material precursor ink and the like can be made conductive by forming a pattern by a known method such as screen printing, gravure printing, gravure offset printing, flexographic printing, and ink jet printing, and then baking.

  The second electrode 5 may also be a so-called thin film transparent electrode using ITO or the like like the first electrode 2. The thin film transparent electrode can be formed in the same manner as the first electrode 2.

  The second electrode 5 may be used by laminating a plurality of conductive materials. For example, Mo / Al / Mo or ITO / Cu / ITO can be used.

  As described above, the first electrode 2 and the second electrode 5 are formed by pairing the first electrode 2 formed in one direction with the second electrode 5 formed in a direction intersecting with the first electrode 2. It can be used as an electrode of a capacitive touch sensor.

  Typically, the first electrode 2 is used as a touch detection electrode, and the second electrode 5 is used as a drive electrode.

  In the case of the example shown in FIG. 1, the first electrode 2 and the second electrode 5 are electrode shapes based on a rectangular pattern, but are not limited thereto. For example, the pattern of the first electrode 2 and the second electrode 5 may be appropriately modified such as a ladder shape or a mesh shape according to the shape of the black resin 4.

  In one embodiment of the present invention, the first electrode 2 and the second electrode 5 can be formed into a pseudo diamond pattern by rearranging the shape of the diamond pattern so as to trace the shape of the black resin 4 in plan view. At this time, when these electrodes are formed of a metal material, the inside of the pseudo diamond pattern is constituted by a thin line electrode having a line width equal to or less than that of the black resin 4.

  As described above, the shapes of the first electrode 2 and the second electrode 5 are overlapped with the black resin 4 or adjusted in pitch so that the appearance of the moire generated by the exposure of the electrode pattern or the interference with the pattern of the black resin 4 is obtained. The trouble can be avoided.

  Moreover, the 1st electrode 2 and the 2nd electrode 5 may have the dummy pattern which is not electrically connected between electrode patterns. Similarly to the electrodes, the dummy pattern can be selected from a shape and pitch corresponding to the shape of the black resin 4, thereby avoiding appearance defects such as exposure of the electrode pattern and moire.

  In one embodiment of the present invention, the first electrode 2 having a plurality of patterns extending in an arbitrary direction has a dummy pattern that is not electrically connected between the electrodes, and the first electrode 2 and the dummy pattern The shape that continues in the extending direction is the same as the shape in which the black resin 4 continues in the direction. For example, in FIG. 1, the pattern shape of the first electrode 2 extending in the Y direction matches the pattern shape of the black resin 4 extending in the Y direction.

  In one embodiment of the present invention, as shown in FIG. 3, the second electrode 5 constitutes a part of the color filter layer 150. As long as the second electrode 5 has a line width equal to or less than the shape of the black resin 4, even if it is on the upper side (protective layer 7 side) of the black resin 4, it is on the lower side (first transparent substrate 1 side). You may install in either. When the second electrode 5 is formed of a metal material, it is preferable to install the second electrode 5 on the upper side of the black resin 4 or to perform an antireflection treatment in order to avoid appearance defects due to metal reflection. When the second electrode 5 is formed of a transparent thin film electrode, it may be installed either on the upper side or the lower side of the black resin 4.

<Protective layer>
The color filter layer 150 includes a black resin 4, a colored resin 6, and a protective layer 7 disposed on the second electrode 5 (see FIGS. 2 and 3). The protective layer 7 can be made of a material that is transparent and excellent in insulation, can be patterned, and has excellent surface flatness. The protective layer 7 can be formed in the same manner as the first transparent insulating layer 3 described above. The thickness of the protective layer 7 is preferably 0.1 μm or more and 25 μm or less.

  As will be described later, the protective layer 7 is configured to electrically connect the first electrode 2 and / or the second electrode 5 to the upper layer when the display device is assembled using the color filter substrate. Alternatively, an opening that does not cover the second electrode 5 is provided.

<First conductive layer, second conductive layer>
The first conductive layer 8 and the second conductive layer 9 are electrically joined to the first electrode 2 or the second electrode 5, and when the display device is assembled using the color filter substrate, a conductive path is formed through the contact hole to the upper layer. It is a conductive layer for forming.

  The contact hole is formed by opening the first transparent insulating layer 3, the black resin 4, the colored resin 6, the protective layer 7 and the like so as to expose a part of the first electrode 2 or the second electrode 5. .

  The first conductive layer 8 and the second conductive layer 9 can be produced by forming and patterning the same material as that of the first electrode 2 and the second electrode 5 through the contact hole in the same manner. The first conductive layer 8 may be formed simultaneously with the second electrode 5. The first conductive layer 8 and the second conductive layer 9 may form a conductive path up to the upper part of the protective layer 7 in one step as shown in FIGS. 2 and 3, and as shown in FIG. A conductive path may be formed up to the upper part of the protective layer 7 through two or more levels so as to pass through the second conductive layer 9 via the first conductive layer 8 above.

  The second conductive layer 9 is an adhesive mixed with silver paste containing a resin component or polymer fine particles (Micropearl (Sekisui Chemical Co., Ltd.), etc.) having a metal layer on the surface as shown in FIG. 5 or 9b shown in FIG. A conductive paste such as a paste can be used to include a portion protruding from the upper surface of the protective layer 7. The second conductive layer 9 may be composed only of the conductive paste 9b (see FIG. 5B and FIG. 6B), or from the conductive thin film layer 9a and the 9b formed thereon. You may comprise (refer FIG. 5 (a) and FIG. 6 (a)).

  The electrode-attached color filter substrate 100 manufactured as described above may be provided with a plurality of surfaces on a single glass substrate. In this case, by cutting the electrode-attached color filter substrate 100 or the state in which the color filter substrate 100 and the TFT substrate 200 are bonded together into individual pieces, a plurality of pieces can be efficiently manufactured. Examples of the singulation method include diamond cutter scribe processing, dicing processing, water jet processing, etching processing, and laser processing.

  As described later, the first electrode 2 and the second electrode 5 on the electrode-attached color filter substrate 100 are electrically connected to the wiring on the counter substrate, respectively, so that they are connected to the driving IC on the counter substrate, It can be operated as a capacitive touch panel. Further, the wiring on the counter substrate can be connected to the FPC via the anisotropic conductive film (ACF) on the counter substrate, and can be connected to a driving IC or the like via the FPC.

[Display device]
The color filter substrate 100 with an electrode of the present invention forms a display cell 300 by combining with a counter substrate. By incorporating this, a display device such as a liquid crystal display, an organic EL display, electronic paper, a MEMS display, a reflective type or a transflective type liquid crystal display can be formed.

  FIG. 4 illustrates one embodiment of a display cell 300 according to the present invention. In the display cell 300 of FIG. 4, the liquid crystal 17 is installed between the color filter substrate 100 with electrodes and the TFT substrate 200. In general, an alignment film is formed on the liquid crystal side surfaces of the color filter substrate 100 and the TFT substrate 200, but they are omitted in FIG.

<TFT substrate>
A plurality of scanning lines are formed on the TFT substrate 200 at regular intervals. In addition, a plurality of signal lines are formed at regular intervals on the scanning lines (the scanning lines and the signal lines are not shown). The scanning line and the signal line are arranged so as to intersect with each other via an insulating film. Then, a thin film transistor (TFT) as a switching element is disposed in the vicinity of the intersection of the scanning line and the signal line (TFT is not shown). A display signal is supplied from the signal line to the pixel electrode via the TFT.

  The pixel electrode 13 is formed from a transparent conductive film such as ITO. Since the display cell 300 of the present invention typically uses an IPS liquid crystal or an FFS liquid crystal whose orientation direction is controlled by a lateral electric field or a fringe electric field, a comb-like ITO electrode as shown in FIG. It is preferable to form. In the case of the pixel electrode 13 shown in FIG. 4, an electric field is formed between the common electrode 15 and the pixel electrode 13, and the orientation of the liquid crystal layer is controlled by a fringe electric field. In the present invention, it is more preferable to use an FFS liquid crystal that uses a fringe electric field because the liquid crystal alignment on the pixel electrode can be used, and the transmittance and contrast are excellent.

  The second transparent insulating layer 14 can be made of a material that is transparent and excellent in insulation, can be patterned, and has excellent surface flatness. The second transparent insulating layer 14 can be formed in the same manner as the first transparent insulating layer 3 described above. The film thickness of the second transparent insulating layer 14 is preferably 0.1 μm or more and 25 μm or less.

  The display area of the liquid crystal display element is composed of a plurality of pixels. The display area is usually formed in a shape close to a rectangle. Furthermore, a frame area provided so as to surround the display area is arranged in the display element.

  A first wiring 10 and a second wiring 11 are formed on the TFT substrate 200 to connect to the electrodes on the electrode-equipped color filter substrate 100 (see FIGS. 7 and 8). The semiconductor used for the TFT may be any of generally known semiconductors such as low-temperature polysilicon, microcrystalline silicon, amorphous silicon, an oxide semiconductor typified by indium-gallium-zinc oxide (IGZO), and an organic semiconductor. .

<LCD>
The liquid crystal 17 can be formed using a known material and is sealed between the color filter substrate 100 with electrodes and the TFT substrate 200. For example, an alignment film (not shown) is formed on the protective layer 7 of the electrode-attached color filter substrate 100 and the surface of the TFT substrate 30 by a method such as flexographic printing, and after the rubbing process is performed, the sealant 18 is dispensed. After the liquid crystal 17 is dropped and the liquid crystal 17 is dropped, the electrode-attached color filter substrate 100 and the TFT substrate 200 are bonded together by vacuum heat lamination, and liquid crystal is sealed at the same time, whereby liquid crystal molecules can be arranged in a certain direction in the display cell 300. it can.

  The liquid crystal used in the liquid crystal display of the present invention is preferably an IPS liquid crystal or an FFS liquid crystal whose orientation direction is controlled by a lateral electric field or a fringe electric field, and an FFS liquid crystal utilizing a fringe electric field is preferably used for the liquid crystal alignment on the pixel electrode. Can be utilized, and thus the transmittance and contrast are excellent and more preferable. The liquid crystal used in the liquid crystal display of the present invention is more preferably a liquid crystal having negative dielectric anisotropy. By using a liquid crystal having negative dielectric anisotropy, it is avoided that the major axis direction of the liquid crystal molecules is aligned in the direction connecting the substrates due to the electric field between the substrates sandwiching the liquid crystal. It is possible to prevent a liquid crystal display defect when operating the touch sensor built in the LCD.

<Display cell>
In the display cell 300 of the present invention, when the second electrode 5 of the color filter substrate 100 and the pixel electrode 13 of the TFT substrate 200 are observed from the transparent base material of the color filter toward the stacking direction (thickness direction) of the substrate. The color filter substrate 100 and the TFT substrate 200 are bonded together so as not to overlap each other (see FIG. 4).

  Since the display cell 300 of the present invention does not have a shield layer, it is considered that the fringe electric field generated from the pixel electrode 13 penetrates the color filter layer 150. However, in the present invention, as described above, since the second electrode 5 of the color filter substrate 100 and the pixel electrode 13 of the TFT substrate 200 are arranged so as not to overlap, the second electrode 5 is separated from the pixel electrode 13. Unaffected by fringing electric field. Therefore, in the present invention, even if no shield layer is provided, the interference of the electric field between the touch sensor portion and the TFT portion can be avoided, and malfunctions and display errors can be suppressed.

  Furthermore, according to the present invention, interference of the electric field between the first electrode 2 and the pixel electrode 13 or the common electrode 15 can also be avoided by adjusting the thickness of the first transparent insulating layer 3 of the color filter substrate 100, and more stable display. Can be provided.

  In the display cell 300, the second conductive layer 9 forms a conductive path through a wiring and a contact hole formed on the counter substrate, as shown in FIG. 7 or FIG. In the present invention, the counter substrate is typically a TFT substrate.

  The distance between the electrode-equipped color filter substrate 100 and the TFT substrate 200 is defined by the height of the spacer 12 formed on the protective layer 7. The second conductive layer 9 formed in advance up to a position slightly higher than the spacer 12 is electrically connected to the first wiring 10 or the second wiring 11 on the TFT substrate 200 by heat and pressure applied at the time of bonding to the TFT substrate 200. Connected. At the time of bonding, the sealing agent 18 is also formed at the same time. At this time, the sealing agent 18 and the second conductive layer 9 may be formed integrally and integrally. In that case, the first electrode 2 and the first wiring 10 or the second electrode 2 using the conductive anisotropy conducted only in the direction between the substrates using an adhesive paste mixed with polymer fine particles having a metal layer on the surface. The electrode 5 and the second wiring 11 can be electrically connected.

<LCD display>
The display cell 300 manufactured according to the present invention as described above is incorporated into a display device. An example of the display device of the present invention is a liquid crystal display 400 (see FIG. 9). In the liquid crystal display 400 of FIG. 9, the liquid crystal 17 is formed between the color filter substrate 100 with electrodes and the TFT substrate 200. In general, an alignment film is formed on the liquid crystal side surfaces of the color filter substrate and the TFT substrate, but they are omitted in FIG. A polarizing plate 50 and a cover glass 70 are sequentially formed on the surface of the color filter substrate with electrode 100 opposite to the liquid crystal 17. A polarizing plate 50 and a backlight 60 are sequentially formed on the surface of the TFT substrate 200 opposite to the liquid crystal 17. In general, an optical compensator and a retardation plate are formed to improve the liquid crystal display quality, but are omitted in FIG.

  The display cell 300 in which the color filter substrate 100 with electrodes and the TFT substrate 200 are bonded together and the liquid crystal 17 is sealed at the same time is used when the glass is used as the first transparent substrate 1 and the second transparent substrate 16. A thinner liquid crystal cell can be provided by chemical polishing with the chemical solution. The liquid crystal display of the present invention is excellent in that the display cell 300 can be made thinner because it is not necessary to form electrodes later on the display cell 300 as in Patent Document 2. The thickness of the display cell 300 can be arbitrarily set by chemical polishing, and is preferably 500 μm or less, more preferably 300 μm or less. The thicknesses of the first transparent substrate 1 and the second transparent substrate 16 may be different, and any one of the substrate thicknesses is preferably less than 150 μm.

  After the display cell 300 has a desired thickness, the display cell 300 can be singulated by a method such as diamond cutter scribe processing, dicing processing, water jet processing, etching processing, or laser processing.

  Subsequently, the polarizing plate 50 is formed in the display cell 300. The polarizing plates 50 arranged on both surfaces of the display cell 300 have absorption axes in directions almost orthogonal to each other. The lighting, gray scale, and extinguishing of each pixel are determined by the direction of linearly polarized light controlled by the liquid crystal. The wiring on the TFT substrate 200 is connected to a driver LSI mounted on the TFT substrate. In addition, it is an excellent point of the present invention that an integrated driver LSI that operates liquid crystal display and touch sensor drive can be used as the driver LSI. The liquid crystal display drive and the touch sensor drive divide the image writing time corresponding to one frame and drive them alternately to achieve both image display and touch sensing. Typically, one frame corresponds to 60 Hz, and the refresh rate of touch sensing is 60 Hz or 120 Hz.

  The backlight 60 is attached to the anti-visible (back) side polarizing plate 50 with an adhesive or the like. The backlight 60 irradiates the polarizing plate 50 with planar light. As the backlight 60, the thing of the general structure provided with the light source, the light-guide plate, the prism sheet etc. is used, for example.

  The cover glass 70 may be adhered to the four sides of the polarizing plate 50 on the viewing side or the four sides of the display housing with a double-sided tape or the like, or the entire surface including the display portion of the liquid crystal display is bonded using a transparent optical adhesive. Also good. The cover glass 70 is made of chemically strengthened glass or transparent resin. Thereby, the liquid crystal display 400 is completed.

  When manufacturing the liquid crystal display 400, for example, the display cell 300 formed of the color filter substrate 100 with electrodes, the TFT substrate 200, and the liquid crystal layer 17 is sandwiched between the polarizing plates 50. Thereafter, the backlight 60 on the back surface and the cover glass 70 on the display surface can be provided to provide a liquid crystal display with a built-in capacitive touch sensor, but is not limited thereto.

  Hereinafter, the present invention will be described in detail by way of specific examples. The examples are for illustrative purposes and the invention is not limited to the examples.

<Example 1>
Based on the following method, a touch sensor built-in type liquid crystal display corresponding to the liquid crystal display 400 of FIG. 9 was produced.

By using 0.5 mm-thick aluminosilicate glass as the first transparent base material 1, ITO is formed at 40 Ω / □ on one surface by sputtering and etched with a mixed aqueous solution of hydrochloric acid and nitric acid by photolithography. A first electrode 2 having a pattern was produced. A dummy pattern in which the electrodes were not electrically connected was used. Then, the photosensitive transparent composition was apply | coated with the spin coater, and it dried for 5 minutes at 100 degreeC with the hotplate, and dried the coating film. Then, after exposing the pattern which makes a part of ITO electrode pad an opening part at 100 mJ / cm < ² > using a high pressure mercury lamp as a light source as a light source through a photomask after that, 0.2 mass% Shower development was carried out with an aqueous sodium hydrogen carbonate solution for 30 seconds to form a patterned first transparent insulating layer 3 with a film thickness of 5 μm. Further, the photosensitive black composition is applied in the same manner as described above to form a pattern with the pixel portion and a part of the ITO electrode pad as an opening, washed with water, and then heat-treated at 230 ° C. for 30 minutes in a hot air circulation oven. As a result, a black matrix pattern was formed.

  Subsequently, ITO / Cu / ITO is formed by sputtering on the black matrix pattern so as to have a sheet resistance of 0.2Ω / □, and etched with a mixed solution of sulfuric acid and hydrogen peroxide by photolithography to obtain a black matrix. The 2nd electrode 5 which has a ladder-like pattern in the position which overlaps with a pattern was produced.

  Thereafter, except that the type of the photosensitive coloring composition was changed, red, green, and blue patterns were sequentially formed in the same manner as the photosensitive black composition, and the color filter layer 150 was formed. Furthermore, the protective layer 7 and the spacer 12 are similarly formed using the photosensitive transparent composition, and the color filter substrate with an electrode including the transparent substrate 1, the ITO electrode 2, the ITO / Cu / ITO electrode 5, and the color filter layer 150 is provided. 100 was formed. At this time, a pad portion was formed so that the ITO electrode and a part of the ITO / Cu / ITO electrode could be electrically contacted from the uppermost layer. The thickness of the protective layer 7 was 1.5 μm.

  Subsequently, an alignment film was formed by printing on the surface of the TFT substrate on which the protective layer 7 of the color filter substrate and the TFT circuit were formed, and then baked at 230 ° C., followed by a rubbing treatment. A silver paste containing a thermoplastic resin was formed by a dispenser on the electrode pad portion of the color filter substrate with electrode 100. Thereafter, the color filter substrate 100 and the TFT substrate 200 are bonded with a sealing material at a position where the second electrode 5 of the color filter substrate 100 and the pixel electrode 13 of the TFT substrate do not overlap each other vertically, and at the same time negative dielectric anisotropy A liquid crystal layer 17 was formed by dropping an FFS liquid crystal having a property, and a display cell 300 was manufactured. At this time, the electrode pad portion was connected to the wiring pad on the TFT substrate 200 side via silver paste. The obtained display cell 300 was protected by a Teflon seal and immersed in a hydrofluoric acid aqueous solution at 35 ° C., whereby the glass portion was chemically polished to a total thickness of 250 μm.

  Subsequently, polarizing plates were attached to the upper and lower surfaces of the display cell 300 using adhesive materials, respectively. An FPC and a liquid crystal drive LSI were connected to the end of the TFT substrate. At this time, the LSI can use a driver in which liquid crystal driving and touch sensor driving are integrated. Furthermore, a backlight was attached to the polarizing plate on the anti-visible (back) side, and chemically strengthened glass was bonded as a cover glass on the visual side (upper) polarizing plate using an optical adhesive. In this way, a very thin liquid crystal display 400 with a built-in capacitive touch sensor was produced.

  By driving the liquid crystal display and touch sensing by time division, the display was good and the touch sensor could be operated well.

<Comparative Example 1>
A liquid crystal display 400 was prepared in the same manner as in the method of Example 1, except that the thickness of the first transparent insulating layer 3 was 0.8 μm.

  The obtained display has a low contrast due to a decrease in the transmittance of the liquid crystal layer, the display is unclear, the touch sensing reaction is insufficient, and the touch detection may not be performed or the linearity may not be reacted.

<Comparative example 2>
A liquid crystal display 400 was prepared in the same manner as in the method of Example 1, except that the thickness of the first transparent insulating layer 3 was 28 μm.

  The obtained display had a part where touch sensing did not respond. This is because the resin residue remains in the opening of the first transparent insulating layer 3 or the conduction between layers by the first conductive layer 8 is disconnected, so that the first electrode 2 cannot be connected to the driving IC.

  The present invention is not limited to the embodiments and examples described above. The shapes of the wiring layer, electrode layer, resin layer, etc. are not limited to those shown in the figure. The design of the present invention can be changed as appropriate based on the knowledge of those skilled in the art. A component described in one drawing can be used in place of the component described in another drawing or in addition to the component described in another drawing. Unless otherwise limited, additional layers may be added between or outside any two layers.

  The color filter substrate with an electrode of the present invention can be used as a touch panel display in which, for example, a liquid crystal display or an organic EL display using a color filter and a capacitive touch sensor are integrated. Furthermore, it can be used as a display and user interface for smartphones, tablets, notebook PCs and the like.

DESCRIPTION OF SYMBOLS 1 1st transparent base material 2 1st electrode 3 1st transparent insulating layer 4 Black resin 5 2nd electrode 6 Colored resin 7 Protective layer 8 First conductive layer 9 Second conductive layer 10 First wiring 11 Second wiring 12 Spacer 13 Pixel electrode 14 Second transparent insulating layer 15 Common electrode 16 Second transparent substrate 17 Liquid crystal 18 Sealing material 41 Black resin opening, subpixel 50 Polarizing plate 60 Backlight 70 Cover glass 100 Color filter substrate 101 with electrode Color filter with electrode Substrate A section 102 Color filter substrate with electrode B section 150 Color filter layer 200 TFT substrate 300 Display cell 400 Liquid crystal display

Claims (20)

A color filter substrate with an electrode comprising at least a transparent substrate, a first electrode, a first transparent insulating layer, and a color filter layer in this order,
The color filter layer includes a black resin, a second electrode, a colored resin, a protective layer,
The surface located on the opposite side of the transparent substrate of the color filter substrate is covered with the protective layer except for a part thereof,
The first electrode and the second electrode are composed of a plurality of patterned electrodes extending in directions perpendicular to each other,
The first electrode is covered with the first transparent insulating layer except for a part,
The second electrode is disposed at a position overlapping the black resin pattern,
The color filter substrate with an electrode, wherein the protective layer has an opening that does not cover the first electrode or the second electrode.   2. The color filter substrate with an electrode according to claim 1, wherein the first transparent insulating layer has a thickness of 1 to 25 μm.   The color filter substrate with an electrode according to claim 1 or 2, wherein the first transparent insulating layer has a relative dielectric constant of 3.3 or less.   The color filter substrate with an electrode according to any one of claims 1 to 3, wherein the refractive index of the first transparent insulating layer is 1.60 or more and 2.00 or less.   The plurality of patterned electrodes of the first electrode have a dummy pattern that is not electrically connected between the electrodes, and the first electrode and the dummy pattern are continuous in a direction in which the first electrode extends. 5. The electrode-attached color filter substrate according to claim 1, wherein the shape of the black resin coincides with a shape of a continuous shape in a direction in which the first electrode of the black resin extends.   The color filter substrate with an electrode according to claim 1, wherein the first transparent insulating layer has an opening that does not cover the first electrode.   The opening of the first transparent insulating layer that does not cover the first electrode is disposed at the same position as the opening of the protective layer that does not cover the second electrode. The color filter substrate with an electrode according to any one of the above.   The first conductive layer made of the same material as that of the second electrode is formed on the opening of the first transparent insulating layer that does not cover the first electrode. The color filter substrate with an electrode according to any one of 7.   The color filter substrate with an electrode according to claim 1, wherein the protective layer has an opening that does not cover the first conductive layer.   The opening that does not cover the first electrode, the second electrode, or the first conductive layer of the protective layer has a second conductive layer laminated on the first conductive layer, and the second conductive layer The electrode-attached color filter substrate according to claim 1, wherein the electrode filter is electrically connected to the first electrode, the second electrode, or the first conductive layer.   The color filter substrate with an electrode according to any one of claims 1 to 10, wherein a spacer is further formed on the protective layer, the spacer is disposed at a position overlapping the black resin, and the transparent substrate The distance from the surface opposite to the protective layer to the apex of the spacer is equal to or shorter than the distance from the surface of the protective layer opposite to the transparent substrate to the apex of the second conductive layer. A color filter substrate with electrodes.   The display apparatus using the color filter substrate with an electrode of any one of Claims 1-11.   The display device according to claim 12, which is a liquid crystal display, (i) a TFT substrate having at least a common electrode and a pixel electrode and having a thin film transistor for lighting a display; (ii) a color filter substrate with an electrode; (Iii) an alignment film formed on the pixel electrode of the TFT substrate and on the protective layer of the color filter substrate with electrode, and (iv) liquid crystal, and the first electrode and the first electrode of the color filter substrate with electrode A liquid crystal display with a built-in touch panel in which two electrodes act as touch sensors.   14. The liquid crystal display with a built-in touch panel according to claim 13, wherein the pixel electrode and the second electrode are present at positions that do not overlap when observed from the transparent base material in a direction in which the substrate is laminated. .   The liquid crystal display with a built-in touch panel according to claim 13 or 14, wherein the first electrode or the second electrode is electrically connected to a wiring formed on the TFT substrate.   A liquid crystal display using the electrode-attached color filter substrate according to claim 10 or 11, comprising at least a common electrode and a pixel electrode, a TFT substrate having a thin film transistor for lighting a display, and the electrode-attached color filter substrate, An alignment film formed on the pixel electrode of the TFT substrate and on the protective layer of the color filter substrate with the electrode, and a liquid crystal, and the first electrode and the second electrode of the color filter substrate with the electrode function as a touch sensor A liquid crystal display with a built-in touch panel, wherein the first electrode or the second electrode is electrically connected to a wiring formed on the TFT substrate via the second conductive layer, and the second conductive The touch is characterized in that the layer is an adhesive mixed with silver fine particles or polymer fine particles having a metal layer on the surface. Channel built-in liquid crystal display.   The liquid crystal display with a built-in touch panel according to claim 13, wherein the liquid crystal is an IPS liquid crystal or an FFS liquid crystal whose orientation direction is controlled by a lateral electric field or a fringe electric field.   The liquid crystal display with a built-in touch panel according to claim 13, wherein the liquid crystal has negative dielectric anisotropy.   The touch sensor and the TFT drive circuit are both connected to a driver LSI mounted on the TFT substrate via wiring on the TFT substrate, and the driver LSI is used for liquid crystal display and touch sensor drive, respectively. The touch panel built-in liquid crystal display according to claim 13, wherein the liquid crystal display is an integrated driver LSI that operates the touch panel.   The liquid crystal display with a built-in touch panel according to any one of claims 13 to 19, wherein the thickness of either the transparent substrate or the substrate used for the TFT substrate is less than 150 µm.