JP2011128208A - Color filter substrate and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color filter substrate used for an in-cell type liquid crystal display device, holding a stable function, because the change of the thickness of a conductive spacer is small even when the color filter substrate is repeatedly used as a touch panel, and to provide a method for manufacturing the color filter substrate. <P>SOLUTION: The color filter substrate for the in-cell type liquid crystal display device has a touch screen function detecting the positional coordinate of a touch position by electrically contacting with an array substrate where a plurality of pixel parts and a signal line for sensing the touch position are formed, in the touch position. In the color filter substrate, at least, the conductive spacer is directly formed on a transparent substrate, a black matrix defining an opening area corresponding to the pixel part is formed in such a state that the conductive spacer is covered, and coloring pixels of a plurality of colors are formed in the opening. A transparent conductive film is formed on the whole surfaces of the coloring pixels. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a color filter substrate used in an in-cell type liquid crystal display device and a manufacturing method thereof.

  A color filter used in a color liquid crystal display device or the like is an indispensable member for a color liquid crystal display device or the like, and has a role of improving the image quality of the liquid crystal display device or giving each pixel a color of each primary color. Yes. The filter segment or black matrix that constitutes this color filter is coated with a photosensitive material on a glass substrate, etc., dried and removed excess solvent, and then exposed through a photomask for pixel formation (proximity exposure). For example, it is formed by irradiating active energy rays using an ultra-high pressure mercury lamp, curing (negative type) or increasing alkali solubility (positive type), and removing a portion dissolved by an alkali solution or the like. By repeating this for each color, a color filter is produced.

  In an active matrix liquid crystal display device, in general, an array substrate in which an active element (thin film transistor, TFT) element is formed for each pixel on a glass substrate, and a color filter and a uniform transparent electrode are formed on the glass substrate. The filter substrate is disposed opposite to the liquid crystal with the liquid crystal interposed therebetween. The shutter action of the liquid crystal of each pixel is controlled by the switching action of each TFT element on the array substrate.

  In a liquid crystal display device using TFTs, a TFT substrate and a color filter substrate are arranged to face each other with a predetermined interval, and the liquid crystal is sandwiched between sealing materials in which reinforcing fibers are mixed with epoxy resin or the like. It is composed by pasting together. Liquid crystal is sealed between the color filter substrate and the TFT substrate, but if the distance between the color filter substrate and the TFT substrate is not accurately maintained, the thickness of the liquid crystal layer will differ, resulting in a difference in the optical rotation characteristics of the liquid crystal. This causes a phenomenon that coloring is caused by or a partial color unevenness occurs and the image is not displayed correctly. Conventionally, in a liquid crystal display device, in order to ensure a uniform cell gap between a TFT substrate and a color filter substrate, glass called a spacer or resin transparent spherical particles (beads) are interposed between these substrates. However, there may be a phenomenon that the spacers are not uniformly dispersed and the spacers are partially biased. When such a phenomenon occurs, the display quality of the portion where the spacers are gathered deteriorates, and there is a problem in terms of accurately maintaining the interval.

  Therefore, a method of forming columnar protrusions having a diameter of 10 μm to 50 μm called spacers on the liquid crystal has been proposed. Patent Documents 1 to 4 disclose techniques for forming a spacer for a liquid crystal display device by a photolithography technique. Patent Documents 5 to 7 disclose techniques for forming spacers for liquid crystal display devices by overlapping colored layers. Hereinafter, the protrusion formed using the photolithography method is referred to as a photo spacer (PS).

  In recent years, color liquid crystal display devices have formed a large market for liquid crystal color televisions, car navigation systems, and liquid crystal display device-integrated notebook personal computers. In addition, touch panel type liquid crystal displays such as mobile audio players and portable game machines in which the touch panel is integrated with a liquid crystal display panel have spread in the market. The touch panel receives an instructed content as an input signal at a position where a finger or a pen contacts, and drives the liquid crystal display device.

Patent Document 8 discloses a transparent touch panel of a resistive film (pressure-sensitive) type that is attached on a display element such as a liquid crystal and is handwritten with a pen, inputs a point, or inputs with a finger while corresponding to display contents. Yes. However, the above-described out-cell method has a problem in that the thickness or size of a product including a touch panel increases. In addition, there are problems in display performance, such as generation of interference fringes due to subtle displacement between the touch panel stripe and the color filter stripe, and the occurrence of parallax in oblique display depending on the distance between the touch panel surface and the color filter surface.

  Therefore, an in-cell method in which a touch panel mechanism is incorporated in the display has been developed. The touch panel is provided on the uppermost side of the liquid crystal display panel, and desired instructions are selected by directly touching an icon or the like displayed on the screen of the liquid crystal display panel with a finger or a pen. For example, in Patent Document 9 (pages 6-9), as a display substrate (color filter substrate) of a display panel having a touch screen function, it is directly formed on a base substrate with a first length and is isolated from the array substrate. A support pattern (PS) that keeps the distance constant and a first signal line and a second signal line that are directly formed in a second length on the base substrate and provided on the array substrate at a touch position, respectively. Disclosed is a display substrate having a first protrusion pattern and a second protrusion pattern that are in contact with each other, wherein the first length is longer than the second length, and a conductive film is formed on the first protrusion pattern and the second protrusion pattern. Has been. Here, the support pattern and the first and second protrusion patterns are formed on the light shielding layer (BM). Hereinafter, the first protrusion pattern and the second protrusion pattern are referred to as conductive spacers (DS).

  FIG. 1 is a cross-sectional view schematically showing an example of a conventional color filter substrate used in a liquid crystal display device (in-cell type liquid crystal display device) incorporating a touch panel input function. In this color filter substrate, a black matrix (2), a colored pixel (3), a conductive spacer (4), and a transparent conductive film (5) are sequentially formed on a glass substrate (1). Accordingly, unillustrated photo spacers (PS) are formed on the black matrix (2) at a predetermined interval via the transparent conductive film (5).

JP 9-258192 A Japanese Patent Laid-Open No. 11-248921 JP 2001-201750 A Japanese Patent Laid-Open No. 2001-108813 JP-A-4-93924 JP-A-4-184423 JP 2007-212826 A JP-A-6-139005 JP 2007-128091 A

However, since the color filter substrate used in the above-described conventional in-cell type liquid crystal display device has a conductive spacer (DS) laminated on a black matrix (BM), it is pressed by a pressing force during repeated use as a touch panel. The conductive spacer is embedded in the resin black matrix layer or is partially pressed, so that the shape is crushed and the function as a touch panel cannot be performed.

   The present invention has been made to solve the above-mentioned problems, and in a color filter substrate used in an in-cell type liquid crystal display device, a stable function is maintained with little change in the thickness of the conductive spacer even when repeatedly used as a touch panel. It is an object of the present invention to provide a color filter substrate that can be produced and a method for producing the same.

According to the first aspect of the present invention, an array substrate on which a plurality of pixel portions and a signal line for detecting a touch position are formed is in electrical contact with the touch position, and the position coordinates of the touch position are obtained. In a color filter substrate for an in-cell type liquid crystal display device having a touch screen function to detect,
In the color filter substrate, at least a conductive spacer is directly formed on a transparent substrate, and a black matrix that defines an opening region corresponding to the pixel portion is formed so as to cover the conductive spacer. A color filter substrate in which colored pixels of a plurality of colors are formed and a transparent conductive film is further formed on the entire surface thereof.

  In the invention according to claim 2 of the present invention, a photospacer is further formed on the black matrix at a position where the conductive spacer is not formed below via the transparent conductive film. The color filter substrate according to claim 1, wherein the color filter substrate is a color filter substrate.

Next, the invention according to claim 3 of the present invention is such that an electrical contact is made at the touch position with an array substrate on which a plurality of pixel portions and signal lines for detecting the touch position are formed, and the position of the touch position. In the method of manufacturing a color filter substrate for an in-cell liquid crystal display device having a touch screen function for detecting coordinates,
at least,
(1) forming a conductive spacer directly on a transparent substrate;
(2) forming a black matrix that defines an opening region corresponding to the pixel portion so as to cover the conductive spacer;
(3) forming a plurality of colored pixels in the opening;
(4) forming a transparent conductive film on the base substrate on which the conductive spacer, the black matrix, and the plurality of colored pixels are formed;
It is a manufacturing method of a color filter substrate characterized by comprising in this order.

  In the invention according to claim 4 of the present invention, a photo spacer is further formed on the transparent conductive film on the black matrix at a position where the conductive spacer is not formed below. A method for producing a color filter substrate according to claim 3.

  As described above, the color filter substrate of the present invention has a structure in which a conductive spacer is directly formed on a transparent substrate, and a black matrix and a transparent conductive film are further laminated thereon. Therefore, even when used repeatedly as a touch panel, the thickness of the conductive spacer is small and a stable function can be maintained.

Further, in the method of manufacturing the color filter substrate of the present invention, the order of the steps is changed from the conventional method, first the conductive spacer portion is formed, then the resin black matrix and the colored pixel layer are formed, and further the transparent layer is formed thereon. By forming the conductive film, it is possible to manufacture a color filter substrate used for a functionally superior in-cell type liquid crystal display device without adding a process that leads to a new cost increase.

  Furthermore, the color filter substrate of the present invention is configured by further forming a photo spacer on the transparent conductive film on the black matrix at a position where the conductive spacer is not formed below, As a color filter substrate with a predetermined photo spacer or as a color filter substrate without a photo spacer, it can be put into the manufacturing process of a liquid crystal display panel and can be applied to a wide variety of liquid crystal display panels. Have advantages.

The partial expanded sectional view which showed typically an example of the conventional color filter substrate for in-cell type liquid crystal display devices. Explanatory drawing which showed typically the process example of the manufacturing method of the color filter substrate of this invention in the partial cross section. BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing which showed typically the example of 1 embodiment of the in-cell type liquid crystal display device to which the color filter substrate of this invention was applied.

  The color filter substrate used for the in-cell type liquid crystal display device of the present invention will be described in detail below based on one embodiment. In the following description, portions having the same functions as those of the conventional color filter substrate will be described using the same names and numbers without changing them.

  In general, an in-cell type liquid crystal display device includes a display panel, a panel drive unit, a touch position detection unit, and the like. The display panel includes an array substrate, a counter substrate, and a liquid crystal layer. The color filter substrate of the present invention is in electrical contact at a touch position as a counter substrate that sandwiches a liquid crystal layer between an array substrate on which a plurality of pixel portions and a signal line for detecting the touch position are formed. It is used for an in-cell type liquid crystal display device having a touch screen function for detecting the position coordinates of the touch position.

  In the array substrate, a plurality of pixels, which are basic units for displaying an image, are formed in a matrix on the base substrate. In the array substrate, normally, a plurality of data lines and a plurality of gate lines in different directions intersecting with the data lines are formed. For each region where each data line and each gate line intersect, a switching element such as a TFT (Thin Film Transistor) and a pixel electrode are formed. In addition, the first and second signal lines for performing the touch screen function are formed on the array substrate in the same direction as the data line and the gate line, and the first and second signal lines are electrically connected to each other. Crossed so that they are electrically insulated. This signal line can be formed for each unit pixel composed of, for example, a red pixel (R), a green pixel (G), and a blue pixel (B), or for a predetermined number of unit pixels. The first signal line and the second signal line are electrically connected to a plurality of sensing electrodes corresponding to each signal line formed separately on the same layout as the pixel electrode.

The color filter substrate of the present invention is opposed to the array substrate as a counter substrate, sandwiches a liquid crystal layer, expresses a predetermined hue in the color filter layer formed for each unit pixel, and generally has a touch screen function. It has a plurality of projecting first and second electrodes for exhibiting. By applying an external force to the protruding electrode with a human finger or the like, the protruding electrode is brought into electrical contact with the sensing electrode connected to the signal line on the array substrate. This protruding electrode is also, for example,
It can be formed for each unit pixel composed of a red pixel (R), a green pixel (G), and a blue pixel (B) or for a predetermined number of unit pixels.

  When the protruding first electrode formed on the color filter substrate of the present invention contacts the sensing electrode of the first signal line formed on the array substrate by an external force, an initial driving voltage applied to the signal line , The position coordinates in the x direction of the point where the external force is applied, for example, are detected, and similarly, the projecting second electrode formed on the color filter substrate of the present invention includes the array substrate. When the sensing electrode of the second signal line formed in contact with the second signal line is touched, it senses that the initial driving voltage applied to the signal line fluctuates, and the position coordinate of the point where the external force is applied, for example, is detected. Then, the position coordinate of the touch position is recognized by the touch position detection unit.

  In the color filter substrate of the present invention, the pixel portion is formed so that at least the conductive spacer (4) for forming the protruding electrode is directly formed on the transparent substrate (1) and the conductive spacer (4) is covered. A black matrix (2) defining an opening region corresponding to is formed, a plurality of colored pixels (3) are formed in the opening, and a transparent conductive film (5) as a common electrode layer is formed on the entire surface. It has a formed configuration. The surface of the conductive spacer (4) is covered with the black matrix (2) and the transparent conductive film (5) in sequence, so that the protruding first electrode (6) or second electrode (6) is formed. 2A to 2D schematically show partial cross sections of the color filter substrate of the present invention in the order of forming steps.

  Furthermore, the color filter substrate according to the present invention is provided with a photoconductive spacer (7) on the black matrix (2) at a position where the conductive spacer (4) is not formed below, if necessary. It is further formed via (5).

  As the transparent substrate (1), an inorganic transparent substrate such as glass, or a transparent resin substrate such as polycarbonate, polymethyl methacrylate, and polyethylene terephthalate can be used. In order to impart a touch screen function to the display panel, for example, when a glass substrate is used so that bending occurs with a small external force, etching or polishing is performed to obtain a thickness of 0.2 mm to 0.5 mm. A thing can preferably be used. Note that the material and thickness can be appropriately selected depending on the specifications of the display panel to be applied.

  First, as shown in FIG. 2A, a photosensitive resin composition for a spacer is directly applied on a transparent substrate (1), and this coating layer is patterned by a known photolithography method to form a projection-like shape. Conductive spacers (4) for forming electrodes are directly formed on the transparent substrate at a desired height. The conductive spacer (4) is directly formed at a position facing each of the plurality of sensing electrodes in a region corresponding to the first signal line and the second signal line formed on the array substrate. Further, the height (thickness) of the conductive spacer (4) is formed such that the sum of the coated black matrix is smaller than the cell gap between the array substrate and the color filter substrate as the counter substrate. To do.

  The transparent and / or colored photosensitive resin composition used for forming the conductive spacer is prepared, for example, by adding a monomer, an initiator, a sensitizer, a solvent, or the like to a resin binder, and inorganic fine particles are added to the resin binder. It may be prepared by dispersing using a dispersant and adding a monomer, an initiator, a sensitizer, a solvent and the like to the dispersion. It is also preferable to color with a pigment or the like in order to prevent alignment and light leakage from the spacer portion. With a resin binder and an initiator as main components, the resin binder is three-dimensionally cross-linked through photopolymerization, thermal polymerization, or photopolymerization and thermal polymerization. By three-dimensionally crosslinking the resin binder of the conductive spacer, the shape of the conductive spacer is crushed due to repeated pressing pressure on the touch panel, and the problem that the function as the touch panel is not performed is reduced.

  Next, as shown in FIG. 2 (b), a black matrix (2) that defines an opening region corresponding to the pixel portion is formed so as to cover the conductive spacer (4), and then, FIG. As shown in FIG. 3, colored pixels (3) of a plurality of colors such as red (R), green (G), and blue (B) are formed in the opening. Further, as shown in FIG. 2 (d), a transparent conductive film (5) as a common electrode layer is formed on the entire surface, and a black matrix (2) and a transparent conductive film are formed on the surface of the conductive spacer (4). By sequentially covering (5), the protruding first electrode (6) or second electrode (6) is formed.

  As a method for forming a black matrix layer or a color filter on a transparent substrate, a pigment dispersion method has become the mainstream. In the pigment dispersion method, a colored photosensitive resin coating layer in which a color material such as an organic pigment is dispersed is patterned by a known photolithography method, whereby a color filter is formed into pixels of a plurality of colored layers (red, green, blue, etc.). It is the method of forming. Although the color order of the black matrix layer and the plurality of colored layers is not limited, for the sake of alignment, colored pixels (red pixel, green pixel, blue color) are formed by applying the colored layer, exposing, developing, etc. after forming the pattern of the black matrix layer. It is desirable to sequentially form pixels.

  In the color filter substrate for an in-cell liquid crystal display device shown in FIG. 2B, the black matrix (2) has a thickness of 0.5 to 3 μm in a cross section of a flat portion not shown, and a width of 3 to 3. The range is 30 μm. However, this film thickness greatly depends on the composition of the black photosensitive resin and the coating method. When the film thickness of the flat portion is about 1.8 μm, the thickness of the black matrix formed on the conductive spacer (4) tends to be as thin as about 0.90 μm. Therefore, since the liquid crystal cell gap as the liquid crystal display device is about 2 μm to 6 μm, the height (thickness) of the conductive spacer (4) is preferably within a range where 1.5 μm to 5.0 μm lower than that can be preferably applied. Become. In the color filter substrate of the present invention, the protruding electrode portion has a conventional problem because the conductive spacer is directly formed on the transparent substrate and the thin black matrix is laminated thereon. Change in thickness (decrease in height) due to external force is reduced.

  The black matrix is a thin light-shielding pattern that is formed between pixels in order to increase the contrast of the liquid crystal display device, which is formed using a black resin. As a method of forming the black matrix, there is a method of forming a black matrix using a black photosensitive resin by a photolithography method. Carbon black and a plurality of organic pigments can be used as the black color material. The black photosensitive resin and the colored photosensitive resin used for forming the black matrix layer and the colored pixel layer are, for example, a pigment dispersed in a resin binder using a dispersant, and a monomer, an initiator, and a sensitizer in this dispersion. It is prepared by adding a solvent or the like.

  In the embodiment of the color filter substrate of the present invention applied to an in-cell type liquid crystal display device having a touch panel function, the black photosensitive resin composition and the colored photosensitive resin composition used for forming the black matrix layer and the colored pixel layer are: The resin binder is three-dimensionally crosslinked through photopolymerization, thermal polymerization, photopolymerization, and thermal polymerization, with a resin binder and an initiator as main components, as in the conductive spacer described above. By three-dimensionally cross-linking the resin binder of the black matrix layer and the color filter layer, it is possible to provide an in-cell type liquid crystal display device in which display defects are unlikely to occur due to mechanical loads such as vibration and pressing as a touch panel.

  Examples of resin binders suitable for photopolymerization include acrylate resins, examples of resin binders suitable for thermal polymerization include epoxy resins, and examples of resin binders suitable for photopolymerization and thermal polymerization include epoxy acrylate resins. It is done.

The alkali-soluble resin that can be used as a resin binder suitable for photopolymerization is not particularly limited as long as it can be dissolved in an alkaline aqueous solution in the light irradiation part or the light shielding part. Examples of the alkali-soluble resin include (meth) acrylic resins containing acrylic acid, styrene resins, novolac resins, maleic resins, and rosin resins. As the polymerizable monomer, for example, the following monomers can be mixed or used alone. For example, monomers containing a hydroxyl group such as 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, Triethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, tetramethylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolethane tri (meth) acrylate, pentaerythritol di (meth) ) Acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol tetra (meth) acrylate , (Meth) acrylic acid esters such as dipentaerythritol hexa (meth) acrylate, glycerol (meth) acrylate, or pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, tricyclodecanyl Examples include (meth) acrylates, hexa (meth) acrylates of caprolactone adducts of dipentaerystol hexa (meth) acrylate, and melamine (meth) acrylates. It is preferable that a part of the polymerizable monomer is a polymerizable monomer containing a carboxyl group-containing polyfunctional monomer. For example, pentaerythritol or a derivative thereof may be used.

  As a photopolymerization initiator for generating an active species for initiating a polymerization reaction of a radical polymerizable monomer, tert-butylperoxy-iso-butarate, 2,5-dimethyl-2,5-bis (benzoyldioxy) hexane 1,4-bis [α- (tert-butyldioxy) -iso-propoxy] benzene, di-tert-butyl peroxide, 2,5-dimethyl-2,5-bis (tert-butyldioxy) hexene hydroperoxide, α- (Iso-propylphenyl) -iso-propyl hydroperoxide, 2,5-bis (hydroperoxy) -2,5-dimethylhexane, tert-butyl hydroperoxide, 1,1-bis (tert-butyldioxy) -3,3 , 5-trimethylcyclohexane, butyl-4,4-bis (t-butyldioxy) valere -To, cyclohexanone peroxide, 2,2 ', 5,5'-tetra (tert-butylperoxycarbonyl) benzophenone, 3,3', 4,4'-tetra (tert-butylperoxycarbonyl) benzophenone, 3,3 ' , 4,4′-tetra (tert-amylperoxycarbonyl) benzophenone, 3,3 ′, 4,4′-tetra (tert-hexylperoxycarbonyl) benzophenone, 3,3′-bis (tert-butylperoxycarbonyl)- Organic peroxides such as 4,4′-dicarboxybenzophenone, tert-butylperoxybenzoate, t-butyldiperoxyisophthalate, 9,10-anthraquinone, 1-chloroanthraquinone, 2- Quinones such as chloroanthraquinone, octamethylanthraquinone, 1,2-benzanthraquinone And benzoin derivatives such as benzoin methyl, benzoin ethyl ether, α-methylbenzoin, α-phenylbenzoin, and the like. Furthermore, examples of the photopolymerization initiator that can be used in the present invention include Irgacure 651, 184, 1173, 907, 369, 819, CGI 124 manufactured by Ciba Specialty Chemicals, TPO manufactured by BASF, Nippon Kayaku ( In addition to benzophenones such as Kayacure DTEX manufactured by Co., Ltd., or 4,4′-diethylaminobenzophenone and 4,4′-dimethylaminobenzophenone, biimidazole compounds and triazine compounds can be exemplified.

Next, as a resin binder suitable for thermal polymerization that can be used in the resin composition, an acrylic compound and an epoxy compound having two or more epoxy groups are contained. The acrylic compound is a polymer, oligomer or monomer such as poly (meth) acrylic acid and has an acrylic group. Examples of the monomer include (meth) acrylic acid, hydroxyalkyl (meth) acrylates, ethylene glycol (meth) acrylates, trimethylolalkane tri (meth) acrylates, pentaerythritol poly (meth) acrylates, and glycerol (meth). Examples include acrylic monomers such as acrylates. These may be used alone or in combination of two or more.

  Examples of the epoxy compound having two or more epoxy groups include bisphenol A type epoxy, bisphenol F type epoxy, dihydroxybiphenyl type epoxy, and phenol novolac type epoxy. When an epoxy compound is contained in the resin composition, a known epoxy curing agent is preferably blended, and examples of the epoxy curing agent include carboxylic acids, phenols, and amines, preferably polyvalent carboxylic acids, And monohydric phenols, acid anhydrides thereof, and carboxylic acid-capped block acids.

  For the red pixel, for example, C.I. I. Pigment Red 7, 14, 41, 48: 2, 48: 3, 48: 4, 81: 1, 81: 2, 81: 3, 81: 4, 146, 168, 177, 178, 179, 184, 185, Red pigments such as 187, 200, 202, 208, 210, 246, 254, 255, 264, 270, 272, and 279 can be used, and a yellow pigment and an orange pigment can also be used in combination.

  Examples of yellow pigments include C.I. I. Pigment Yellow 1, 2, 3, 4, 5, 6, 10, 12, 13, 14, 15, 16, 17, 18, 24, 31, 32, 34, 35, 35: 1, 36, 36: 1, 37, 37: 1, 40, 42, 43, 53, 55, 60, 61, 62, 63, 65, 73, 74, 77, 81, 83, 93, 94, 95, 97, 98, 100, 101, 104, 106, 108, 109, 110, 113, 114, 115, 116, 117, 118, 119, 120, 123, 126, 127, 128, 129, 138, 139, 147, 150, 151, 152, 153, 154, 155, 156, 161, 162, 164, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 179, 180 181, 182, 187, 188, 193, 194, 199, 198, 213, 214 and the like. Examples of the orange pigment include C.I. I. Pigment Orange 36, 43, 51, 55, 59, 61, 71, 73 and the like.

  For example, C.I. I. Green pigments such as Pigment Green 7, 10, 36, 37, and 58 can be used, and a yellow pigment can be used in combination. As the yellow pigment, the same pigments as those used for the red pixel can be used.

Examples of blue pixels include C.I. I. Pigment Blue 15, 15: 1, 15: 2, 15: 3, 15: 4, 15: 6, 16, 22, 60, 64, and the like can be used, and a purple pigment can be used in combination. Examples of purple pigments include C.I. I. Pigment
Violet 1, 19, 23, 27, 29, 30, 32, 37, 40, 42, 50 etc. are mentioned.

Furthermore, in the present invention, the inorganic fine particles that can be used for the conductive spacer and the photo spacer described later are not particularly limited as long as the average particle size is 1 to 100 nm, but specifically, Al ₂ O _3. , TiO ₂ , Fe ₂ O ₃ , ZnO, CeO ₂ , Y ₂ O ₃ , Mn ₃ O ₄ , SiO _2, etc. Those coated with an epoxy resin or the like are preferable. The fine particles having an average particle diameter of 1 to 100 nm are suitably contained in an amount of 5 to 15 parts by mass with respect to the solid content of the transparent resin composition. When the amount is less than 5 parts by mass, a large contribution to the hardness of the spacer is not recognized. On the other hand, adding more than 15 parts by mass is not preferable because defects such as surface roughness occur. The fine particles may be added as a powder in the transparent resin composition, or those previously dispersed in a solvent may be added. At this time, the surface of the fine particles may be previously treated with a resin or the like so as to be easily dispersed, or a dispersant or the like may be added separately.

  As shown in FIG. 2D, the conductive spacer (4), the black matrix (2), and the colored pixels (3) of multiple colors such as red (R), green (G), and blue (B) are formed. A transparent conductive film (5) as a common electrode layer is formed on the entire surface, and a black matrix (2) and a transparent conductive film (5) are sequentially coated on the surface of the conductive spacer (4). The protruding first electrode (6) or second electrode (6) is formed. If necessary, it is also possible to form a transparent conductive film after forming a transparent protective layer or a planarizing layer on the colored layer and the black matrix. Also in this case, the height (thickness) obtained by adding the black matrix and the transparent protective layer to the conductive spacer is designed to be smaller than the cell gap.

  As a method for forming the transparent conductive film, vacuum deposition methods called vapor deposition, ion plating, and sputtering are generally used. For the transparent conductive film, a composite oxide of a metal oxide such as indium, tin, gallium, or zinc can be used.

In the color filter substrate according to the present invention, as illustrated in FIG. 3, the photo spacer (7) is placed on the black matrix (2) at a position where the conductive spacer (4) is not formed below. By further forming on the conductive film (5), it is possible to produce a color filter substrate with a predetermined photo spacer.
Alternatively, as a color filter substrate without a photo spacer, it is possible to use a bead-shaped spacer by introducing it into a liquid crystal display panel manufacturing process.

  In addition, the photo spacer can be formed by a photolithography technique using the above-described resin composition for forming a conductive spacer. By a photolithographic method of partial pattern exposure and development, a desired position, for example, a position where the conductive spacer (4) is not formed below on the black matrix (2) in a lattice pattern located between the pixels. In addition, columnar photospacers are arranged by forming on the transparent conductive film (5). The position where the photospacer (7) is provided is not limited to the black matrix (2), and may be on the colored pixel (3), for example. However, considering the display quality of the liquid crystal display device, it is preferably on the black matrix (2). For the development when forming the photo spacer, an organic solvent may be used, but an alkaline aqueous solution is preferably used in consideration of environmental considerations.

  FIG. 3 is a partial cross-sectional view schematically showing an embodiment of an in-cell type liquid crystal display device to which the color filter substrate of the present invention is applied. As shown in FIG. 3, the photo spacer (7) is provided between the substrates in order to provide an interval for sandwiching the liquid crystal (LC) between the color filter substrate (10) and the array substrate (20). A gap is set. The photospacer (7) preferably has elasticity that deforms following the thermal expansion and contraction of the liquid crystal due to temperature, as well as the hardness to maintain the gap between the substrates.

  The protruding first electrode (6-1) formed on the color filter substrate (10) of the present invention by the external force is changed to the sensing electrode (26) of the first signal line (not shown) formed on the array substrate (20). When contacted with -1), it is sensed that the initial drive voltage applied to the signal line fluctuates, and the position coordinates in the x direction, for example, of the point where the external force is applied are detected. Similarly, the projecting second electrode (6-2) formed on the color filter substrate (10) of the present invention is replaced with a sensing electrode (26) of a second signal line (not shown) formed on the array substrate (20). -2), for example, the position coordinate in the y direction of the point where the external force is applied is detected by detecting that the initial driving voltage applied to the signal line fluctuates, and the touch position detection unit detects the touch position. The position coordinates will be recognized.

As described above, a plurality of pixels, which are basic units for displaying images, are formed in a matrix on the base substrate 21 on the array substrate. In the array substrate, normally, a plurality of data lines (not shown) and a plurality of gate lines in different directions intersecting with the data lines are formed. A switching element (not shown) such as a TFT (Thin Film Transistor) and a pixel electrode (23) are formed in each region where each data line and each gate line intersect.
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  As described above, in the color filter substrate of the present invention, the order of the steps is changed from the conventional manufacturing method, first the conductive spacer portion is formed, and then the resin black matrix and the colored pixel layer are formed, and further thereon. By forming the transparent conductive film, it is possible to manufacture a color filter substrate used in an in-cell type liquid crystal display device with excellent functionality without adding a process leading to a new cost increase.

DESCRIPTION OF SYMBOLS 1 ... Transparent substrate 2 ... Black matrix 3 ... Colored pixel
3R ... Red pixel 3G ... Green pixel 3B ... Blue pixel
4... Conductive spacer 5. Transparent conductive film 6. Projected electrode
7 ... Photo spacer 10 ... Color filter substrate 20 ... Array substrate 21 ... Base substrate 23 ... Pixel electrode 26 ... Sensing electrode

Claims (4)

An in-cell liquid crystal display having a touch screen function for detecting the position coordinates of the touch position by making electrical contact with the array substrate on which a plurality of pixel portions and a signal line for detecting the touch position are formed. In the color filter substrate for equipment,
In the color filter substrate, at least a conductive spacer is directly formed on a transparent substrate, and a black matrix that defines an opening region corresponding to the pixel portion is formed so as to cover the conductive spacer. A color filter substrate, wherein a plurality of colored pixels are formed, and a transparent conductive film is further formed on the entire surface thereof.   2. The color filter substrate according to claim 1, wherein a photo spacer is further formed on the black matrix at a position where the conductive spacer is not formed below via the transparent conductive film. . An in-cell liquid crystal display having a touch screen function for detecting the position coordinates of the touch position by making electrical contact with the array substrate on which a plurality of pixel portions and a signal line for detecting the touch position are formed. In a method for manufacturing a color filter substrate for an apparatus,
at least,
(1) forming a conductive spacer directly on a transparent substrate;
(2) forming a black matrix that defines an opening region corresponding to the pixel portion so as to cover the conductive spacer;
(3) forming a plurality of colored pixels in the opening;
(4) forming a transparent conductive film on the base substrate on which the conductive spacer, the black matrix, and the plurality of colored pixels are formed;
A method for manufacturing a color filter substrate, comprising the steps in this order.   4. The color filter substrate according to claim 3, wherein a photo spacer is further formed on the transparent conductive film on the black matrix at a position where the conductive spacer is not formed below. Method.