JP2009276555A - Method for manufacturing color filter for semi-transmissive liquid crystal display and its manufacturing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a color filter for a semi-transmissive liquid crystal display for enlarging a thickness difference between coloring layers of a reflection region and a transmissive region to enhance reflection brightness. <P>SOLUTION: The method for manufacturing the color filter includes: an applying process for applying a coating liquid for forming the coloring layer including a photosensitive resin composition for the coloring layer so as to cover an optical path difference adjusting part of a color filter substrate having a transparent base material and the optical path difference adjusting part formed on the transparent base material; a heating process for heating the coating liquid for forming the coloring layer on the optical path difference adjusting part in order to flow the coating liquid for forming the coloring layer applied on the optical path difference adjusting part into a transmissive light region; a drying process for pressure-decreasing and drying the coating liquid for forming the coloring layer after the heating process and forming the coloring layer; and a prebaking process for heating the layer for forming the coloring layer formed in the drying process. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a color filter for a transflective liquid crystal display device used for a transflective liquid crystal display device and the like, and more specifically, there is a large difference in thickness between colored layers in a reflected light region and a transmitted light region. The present invention relates to a method for manufacturing a color filter for a transflective liquid crystal display device, which can increase the luminance during reflection display when used in a liquid crystal display device.

  In recent years, a transflective liquid crystal display device utilizing external light reflection and backlight transmitted light has been developed as a liquid crystal display device. The transflective liquid crystal display device uses external light to display. The conventional reflective color liquid crystal display device is advantageous in that it also has a backlight and can perform display (transmission display) using the backlight even when the surroundings are dark.

  However, in such a transflective liquid crystal display device, outside light that has entered in the reflected light region normally passes through the color filter twice, whereas in the transmitted light region, it usually passes through the color filter only once. In other words, there is a problem in that color characteristics are different between transmissive display and reflective display.

In order to solve the above problems, the transmitted light region and the reflected light region are adjusted by adjusting the film thickness ratio between the colored layer formed in the transmitted light region and the colored layer formed in the reflected light region. Attempts have been made to control the color characteristics of the areas.
Here, as a method of adjusting the thickness of the colored layer, a method of forming a thick layer and a thin layer of colored patterns of respective colors has been used. However, when the colored layer is formed using a photolithography method that is generally used for forming a colored layer of a color filter, the colored layer has a colored pattern of three colors of red, green, and blue. Has a problem that the productivity is very low because it is necessary to perform exposure and development six times because it is necessary to form a thick layer and a thin layer for the coloring patterns of each color of red, green, and blue. was there.

For example, in Patent Document 1, transmission of exposure light in which a portion corresponding to the reflected light region is a translucent portion and a portion corresponding to the transmitted light region is a transparent portion is disclosed. A method for forming a colored layer using a halftone mask having portions of different degrees is disclosed. According to this method, the thickness of the colored layer corresponding to the reflected light region is reduced and the thickness of the colored layer corresponding to the transmitted light region is increased due to the difference in the transmittance of the exposure light of the halftone mask. A thick layer and a thin layer can be formed at a time. Therefore, when the colored layer has three colored patterns of red, green, and blue, it is possible to form a thick layer and a thin layer at once for the colored patterns of red, green, and blue. Therefore, it can be formed by performing exposure and development three times.
However, in the method of thinning the colored layer in the reflected light region using only such a halftone mask, it is difficult to uniformly expose the entire surface of the color filter. There was a problem that the thickness of the layer may vary. Although the thickness of the colored layer in the transmitted light area and reflected light area can be adjusted, when the color filter is used in a liquid crystal display device, it passes through the liquid crystal layer in the transmitted light area and reflected light area. There was a problem that it was impossible to adjust the optical path difference.

In addition, as a method for adjusting the optical path difference without causing variation in the thickness of the colored layer in the case of using the halftone mask described above, for example, as shown in FIG. Of the base material 101, the optical path difference adjustment unit 102 having a predetermined film thickness, which is formed only in the reflected light region (region indicated by r) used for reflection display, and covers the optical path difference adjustment unit 102. The color filter 100 for a transflective liquid crystal display device, which includes the formed colored layer 106 and includes a reflected light region (region indicated by r) and a transmitted light region (region indicated by t). A method of adjusting the optical path difference by using is disclosed (Patent Document 2).
According to this method, the optical path difference passing through the liquid crystal layer can be adjusted. Further, during production, a liquid material such as a coating liquid for forming a colored layer has a convex portion due to irregularities on the surface of the non-application destination. Since it has the property of being thinly applied on the surface and thickly applied on the surface of the recesses, it is reflected when the colored layer forming coating liquid is applied on the transparent substrate so as to cover the optical path difference adjusting part. The film thickness of the colored layer forming coating solution on the optical path difference adjusting portion which is the light region is thin, and the film thickness of the colored layer forming coating solution in the transmitted light region is thick. For this reason, the thickness of the colored layer in the area | region for transmitted light can be made thick, and the thickness of the colored layer in the area | region for reflected light can be made thin.
However, with such a method, it is difficult to increase the difference in film thickness between the transmitted light region and the reflected light region. When such a color filter is used as a liquid crystal display device, There is a problem that the luminance at the time of reflective display becomes low.

JP 2004-365422 A JP 2004-102243 A

  The present invention has been made in view of the above problems, and has a large thickness difference between the colored layer in the reflected light region and the transmitted light region, and excellent uniformity in the thickness of the colored layer in the reflected light region. It is a main object of the present invention to provide a method for producing a color filter for a transflective liquid crystal display device capable of producing a color filter for a transflective liquid crystal display device.

  As a result of repeated research to solve the above problems, the present inventors have formed a colored layer forming coating liquid containing a photosensitive resin composition for a colored layer, and an optical path difference adjusting portion is formed in the reflected light region. After coating on the color filter substrate, the color filter substrate is allowed to stand, so that the colored layer forming coating solution applied on the optical path difference adjusting unit is transmitted through the color filter substrate. Since it was found that the difference in thickness of the colored layer between the reflected light region and the transmitted light region can be increased, particularly that the tendency is large during heating, and the present invention has been completed. is there.

  That is, the present invention provides a transparent base material, an optical path difference adjusting portion formed on the transparent base material and made of a transparent resin, and a photosensitive resin composition for a colored layer formed so as to cover the optical path difference adjusting portion. The transparent substrate and the colored layer are laminated using a region where the transparent substrate, the optical path difference adjusting unit, and the colored layer are laminated as a region for reflected light. A method for manufacturing a color filter for a transflective liquid crystal display device using the formed region as a region for transmitted light, the color filter having the transparent base material and an optical path difference adjusting unit formed on the transparent base material A coating step of applying a coating solution for forming a colored layer containing a photosensitive resin composition for a colored layer so as to cover the optical path difference adjusting portion of the substrate for forming, and formation of a colored layer applied on the optical path difference adjusting portion In order to allow the coating liquid to flow into the transmitted light region, A heating step of heating the colored layer forming coating solution on the optical path difference adjusting unit; a drying step of drying the colored layer forming coating solution after the heating step under reduced pressure to form a colored layer forming layer; and And a pre-baking step of heating the colored layer forming layer formed by the drying step. A method for producing a color filter for a transflective liquid crystal display device is provided.

  According to the present invention, in order to cause the colored layer forming coating solution applied on the optical path difference adjusting unit to flow into the transmitted light region, the colored layer forming coating on the optical path difference adjusting unit is applied. By performing the heating process for heating the liquid between the coating process and the drying process, the thickness of the colored layer in the reflected light region is more than the thickness of the colored layer in the transmitted light region. Can also be made thin and the difference between them can be large. In addition, the thickness of the colored layer in the reflected light region can be excellent in uniformity.

In this invention, the temperature which heats the said coating liquid for colored layer formation of the said heating process is lower in the range of 20 to 100 degreeC than the temperature which heats the said layer for colored layer formation in the said prebaking process. It is preferable.
The difference between the temperature for heating the colored layer forming coating solution in the heating step and the temperature for heating the colored layer forming layer in the prebaking step is larger than the above range, that is, the heating temperature in the heating step. However, if the temperature is very low, it may be difficult to cause the colored layer forming coating solution on the optical path difference adjusting unit to flow into the transmitted light region in a sufficient amount. If the heating temperature in the heating step is smaller than the above range, that is, the heating temperature in the prebaking step is close to the heating temperature in the prebaking step, color unevenness may occur in the colored layer manufactured by the manufacturing method of the present invention. It is.

In the present invention, the heating step heats the colored layer forming coating solution by allowing the color filter substrate coated with the colored layer forming coating solution to stand on a hot plate. Is preferred.
The heating step heats the colored layer forming coating solution using a hot plate, thereby allowing the colored layer forming coating solution on the optical path difference adjusting unit to flow into the transmitted light region. This is because the thickness of the reflected light region can be reduced. Further, it is easy to equalize the amount of flow into the transmitted light region and the thickness of the colored layer forming coating solution, and further simplify the heating step.

  In this invention, it is preferable that the viscosity difference in 25 degreeC and 40 degreeC of the said coating liquid for colored layer formation exists in the range of 0.2 mPa * s-4.0 mPa * s. When the viscosity difference of the colored layer forming coating solution is within the above range, in the heating step, the colored layer forming coating solution on the optical path difference adjusting unit flows into the transmitted light region. This is because the amount can be made sufficiently large.

  The present invention includes a transparent base material, an optical path difference adjusting portion formed on the transparent base material and made of a transparent resin, and a photosensitive resin composition for a colored layer formed to cover the optical path difference adjusting portion. The transparent substrate and the colored layer are laminated using a region where the transparent substrate, the optical path difference adjusting unit, and the colored layer are laminated as a region for reflected light. Apparatus for producing a color filter for a transflective liquid crystal display device using the region as a region for transmitted light, the color filter having the transparent base material and an optical path difference adjusting unit formed on the transparent base material Application means for applying a coating solution for forming a colored layer containing a photosensitive resin composition for a colored layer so as to cover the optical path difference adjusting part of the substrate, and for forming a colored layer applied on the optical path difference adjusting part In order to allow the coating liquid to flow into the transmitted light region, the optical path A heating means for heating the colored layer forming coating liquid on the adjusting portion; and a drying means for drying the colored layer forming coating liquid heated by the heating means under reduced pressure to form a colored layer forming layer. An apparatus for producing a color filter for a transflective liquid crystal display device, characterized in that pre-baking means for heating the colored layer forming layer formed by the drying means is continuously arranged in this order. provide.

  According to the present invention, in order to cause the colored layer forming coating solution applied on the optical path difference adjusting unit to flow into the transmitted light region, the colored layer forming coating on the optical path difference adjusting unit is applied. By providing a heating means for heating the liquid between the coating means and the drying means, the color filter for a transflective liquid crystal display device manufactured by the manufacturing apparatus of the present invention is reflected light. The difference in film thickness between the colored layer in the area for use and the colored layer in the area for transmitted light can be made large. Further, the color filter for a transflective liquid crystal display device can be made excellent in the uniformity of the thickness of the colored layer in the reflected light region.

  In the present invention, the heating means is preferably a hot plate. When the heating means is a hot plate, the amount of the colored layer forming coating solution on the optical path difference adjusting unit flowing into the transmitted light region is increased, and the reflected light region is thinned. This is because it becomes possible. Moreover, it is because it is easy to equalize the amount of flow into the transmitted light region and the thickness of the colored layer forming coating solution. Moreover, it is because the said heating process can be made simple.

  In the present invention, there is a large difference in thickness between the colored layers in the reflected light region and the transmitted light region, and when used in a transflective liquid crystal display device, the brightness at the time of reflective display can be increased. There is an effect that a method for manufacturing a color filter for a liquid crystal display device can be provided.

The present invention relates to a method for manufacturing a color filter for a transflective liquid crystal display device and a manufacturing apparatus used therefor.
Hereinafter, the manufacturing method of the color filter for transflective liquid crystal display devices and the manufacturing apparatus of the color filter for transflective liquid crystal display devices of the present invention will be described in detail.

A. First, a method for producing a color filter for a transflective liquid crystal display device according to the present invention will be described. The method for producing a color filter for a transflective liquid crystal display device according to the present invention is formed so as to cover a transparent base material, an optical path difference adjusting portion formed on the transparent base material and made of a transparent resin, and the optical path difference adjusting portion. A colored layer containing a photosensitive resin composition for a colored layer, and a region where the transparent base material, the optical path difference adjusting unit, and the colored layer are laminated is used as a reflected light region. A method for producing a color filter for a transflective liquid crystal display device, which uses a region where a transparent substrate and the colored layer are laminated as a region for transmitted light, and is formed on the transparent substrate and the transparent substrate. A coating process for applying a colored layer forming coating solution containing a photosensitive resin composition for a colored layer so as to cover the optical path difference adjusting part of the color filter substrate having the optical path difference adjusting part formed, and the optical path The colored layer forming coating liquid applied on the difference adjusting portion is In order to flow into the overlight region, a heating step for heating the colored layer forming coating solution on the optical path difference adjusting unit, and the colored layer forming coating solution after the heating step are dried under reduced pressure. And a drying step for forming the colored layer forming layer, and a pre-baking step for heating the colored layer forming layer formed by the drying step.

  A method for producing such a color filter for a transflective liquid crystal display device of the present invention will be described with reference to the drawings. FIG. 1 is a process diagram showing an example of a method for producing a color filter for a transflective liquid crystal display device of the present invention. As illustrated in FIG. 1, the method for producing a color filter for a transflective liquid crystal display device according to the present invention includes a transparent substrate 1 and an optical path difference adjusting unit 2 formed on the transparent substrate 1 and made of a transparent resin. And applying a red colored layer forming coating solution 3 containing a photosensitive resin composition for a red colored layer so as to cover the optical path difference adjusting unit 2 (see FIG. 1 (a)) and the red colored layer forming coating solution 3 applied on the optical path difference adjusting unit 2 to flow into the transmitted light region. The heating process (FIG. 1 (b)) which makes the film thickness of the coating liquid 3 for red colored layer formation on the said optical path difference adjustment part 2 thin by performing heating of 3 for a predetermined time, and said red colored layer formation Drying step of drying coating liquid 3 under reduced pressure to form red colored layer forming layer 4 and the above red color Heating the color layer forming layer 4 performs a pre-bake step of solidifying the red colored layer forming layer 4 (FIG. 1 (c)).

Subsequently, exposure with ultraviolet rays is performed through a photomask 30 having an opening region 31 that transmits ultraviolet light in a region where a red colored layer is formed and a light shielding region 32 that does not transmit ultraviolet light in a region where a red colored layer is not formed. Next, by performing an exposure / development step (FIG. 1 (d)) in which the red colored layer forming layer 4 in the unexposed area is removed by development, a patterned red colored pattern 5R is formed (FIG. 1 ( e)). Then, using the coating liquid for forming the green colored layer and the coating liquid for forming the blue colored layer, the coating process, the heating process, the drying process, the pre-baking process, and the exposure described above are performed in the same manner as the red colored pattern is formed. A color for a transflective liquid crystal display device having a colored layer 6 formed of a red colored pattern 5R, a green colored pattern 5G, and a blue colored pattern 5B by forming a green colored pattern 5G and a blue colored pattern 5B by performing a development process The filter 10 is formed (FIG. 1 (f)).
Here, in the color filter 10 for a transflective liquid crystal display device, a region where the transparent substrate 1, the optical path difference adjusting unit 2, and the colored layer 6 are laminated is a reflected light region (indicated by r). A region where the transparent base material 1 and the colored layer 6 are laminated is a transmitted light region (a region indicated by t).

According to the present invention, in order to cause the colored layer forming coating solution applied on the optical path difference adjusting unit to flow into the transmitted light region, the colored layer forming coating on the optical path difference adjusting unit is applied. By performing the heating process for heating the liquid between the coating process and the drying process, the thickness of the colored layer in the reflected light region is more than the thickness of the colored layer in the transmitted light region. Can also be made thin and the difference between them can be large. In addition, the thickness of the colored layer in the reflected light region can be excellent in uniformity.
Here, the reason why the above-described effects are exhibited by performing the heating step between the coating step and the drying step is estimated as follows.

  That is, conventionally, a liquid material such as a coating liquid for forming a colored layer is applied thinly on the surface of the convex portion and unevenly applied on the surface of the concave portion due to the unevenness on the surface of the non-application destination. The thickness of the colored layer forming coating solution applied on the transparent substrate on which the optical path difference adjusting unit is formed is thin on the optical path difference adjusting unit, which is the reflected light region, and in the transmitted light region. It was supposed to be thick. According to such a method, the thickness of the colored layer in the transmitted light region can be increased and the thickness of the colored layer in the reflected light region can be decreased, but the difference in film thickness is not sufficient. It was.

On the other hand, the inventors applied the color filter substrate coated with the colored layer forming coating solution in the coating step, by leaving the substrate for a predetermined time, thereby coloring the optical path difference adjusting unit. It has been found that the layer-forming coating solution can be caused to flow into the transmitted light region, and the thickness of the colored layer-forming coating solution in the reflected light region can be made thinner.
Further, by leaving the color filter substrate after the coating step for a predetermined time, the colored layer forming coating liquid applied on the optical path difference adjusting unit is allowed to flow into the transmitted light region. , Leaving is performed between the application step and the drying step, and the colored layer forming coating solution applied by the application step sufficiently contains a solvent and has a low viscosity. Thus, the colored layer forming coating liquid applied on the optical path difference adjusting unit can be effectively flowed into the transmitted light region, and the reflected light region and the transmitted light region are formed in the colored layer. The difference in the thickness of the coating liquid can be made large.
Furthermore, the viscosity of the coating liquid for forming the colored layer is obtained by carrying out such placement while heating the coating liquid for forming the colored layer on the reflected light region, that is, the optical path difference adjusting unit. The amount of the colored layer forming coating solution flowing from the optical path difference adjusting section into the transmitted light region can be increased.

  Therefore, the heating process for heating the colored layer forming coating solution for a predetermined time is performed between the coating process and the drying process, so that the color filter substrate after the coating process is applied. The colored layer forming coating solution is allowed to stand for a predetermined time in a low viscosity state, and the colored layer forming coating solution applied on the optical path difference adjusting unit flows into the transmitted light region. Can be made. Further, by simultaneously heating the colored layer forming coating solution on the optical path difference adjusting unit, the amount of the colored layer forming coating solution flowing into the transmitted light region can be increased. it can. For this reason, in the color filter for a transflective liquid crystal display device formed by the manufacturing method of the present invention, the thickness of the colored layer in the reflected light region is sufficiently larger than the thickness of the colored layer in the transmitted light region. It can be thin. In addition, since the halftone mask is not used, the thickness of the colored layer in the reflected light region is uniform without causing unevenness in the thickness of the colored layer in the reflected light region that occurs when the halftone mask is used. It can be made excellent in properties.

  The amount of the colored layer forming coating solution on the optical path difference adjusting unit flowing into the transmitted light region is the viscosity of the colored layer forming coating solution, that is, the coloring on the optical path difference adjusting unit. Since it can be adjusted by the temperature of the layer forming coating solution, it has an advantage that the thickness of the colored layer in the reflected light region can be easily adjusted.

  The method for producing a color filter for a transflective liquid crystal display device of the present invention comprises at least a coating process, a heating process, a drying process, and a pre-baking process. Hereinafter, each process of the manufacturing method of the color filter for transflective liquid crystal display devices of this invention is demonstrated.

1. Coating process The coating process in the present invention is a color layer photosensitive so as to cover the optical path difference adjusting portion of the color filter substrate having the transparent base material and the optical path difference adjusting portion formed on the transparent base material. It is the process of apply | coating the coating liquid for colored layer formation containing a conductive resin composition.

(1) Colored layer forming coating solution The colored layer forming coating solution used in this step is applied so as to cover an optical path difference adjusting portion of a color filter substrate described later, and is a colored layer photosensitive. Containing a functional resin composition.

  The photosensitive resin composition for the colored layer used in this step is usually colored by each color forming each colored pattern of the colored layer included in the color filter for a transflective liquid crystal display device produced by the production method of the present invention. And at least a binder resin.

  As the colorant for each color used in this step, those generally used in the production of color filters can be used. When the colored layer is formed by the production method of the present invention, red (R), green ( G), three colors of blue (B), or four colors of red (R), green (G), blue (B), yellow (Y), or red (R), green (G), blue ( Examples thereof include those capable of forming a colored layer including a colored pattern such as five colors of B), yellow (Y), and cyan (C).

Examples of the colorant used in the red (R) coloring pattern include perylene pigments, lake pigments, azo pigments, quinacridone pigments, anthraquinone pigments, anthracene pigments, and isoindoline pigments. These pigments may be used alone or in combination of two or more.
Examples of the colorant used in the green (G) coloring pattern include phthalocyanine pigments such as halogen polysubstituted phthalocyanine pigments or halogen polysubstituted copper phthalocyanine pigments, triphenylmethane basic dyes, isoindoline pigments, Examples include isoindolinone pigments. These pigments or dyes may be used alone or in combination of two or more.
Examples of the colorant used in the blue (B) coloring pattern include copper phthalocyanine pigments, anthraquinone pigments, indanthrene pigments, indophenol pigments, cyanine pigments, dioxazine pigments, and the like. These pigments may be used alone or in combination of two or more.

  In the photosensitive resin composition for a colored layer used in this step, the content of the colorant for each color is a colored layer contained in a color filter for a transflective liquid crystal display device produced by the production method of the present invention. The color layer is not particularly limited as long as it can achieve a desired color, but is preferably in the range of 10% by mass to 70% by mass in the photosensitive resin composition for the colored layer. However, it is preferably in the range of 10% by mass to 50% by mass. It is because the colored layer formed by the manufacturing method of this invention can have a desired color development by being the said range.

  The binder resin used in this step is not particularly limited as long as it is transparent and photosensitive, and has, for example, a reactive vinyl group such as an acrylate, methacrylate, polyvinyl cinnamate, or cyclized rubber. Things can be used.

The coating solution for forming a colored layer used in this step usually contains a solvent capable of uniformly dispersing or dissolving the photosensitive resin composition for the colored layer.
Examples of such a solvent include butyl acetate, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, ethyl cellosolve, 3-methoxybutyl acetate and the like.

  As content of the solvent used for this process, it is that content of the component except a solvent is in the range of 5 mass%-40 mass% among the coating liquids for colored layer formation used for this process. It is preferable to mix | blend a solvent so that it may become in the range of 10 mass%-30 mass% especially. This is because a viscosity suitable for coating can be obtained.

As the viscosity of the colored layer forming coating solution used in this step, the colored layer forming coating solution applied on the optical path difference adjusting portion of the color filter substrate described later in this step is heated as described later. In the process, it is not particularly limited as long as it can flow into the transmitted light region of the color filter substrate, but at 25 ° C. and 40 ° C. of the colored layer forming coating solution. The viscosity difference is preferably in the range of 0.2 mPa · s to 4.0 mPa · s, more preferably in the range of 0.5 mPa · s to 4.0 mPa · s, particularly 1.0 mPa · s. -It is preferable to be in the range of s to 4.0 mPa · s. When the viscosity difference of the colored layer forming coating liquid is within the above range, in the heating step described later, the colored layer forming coating liquid on the optical path difference adjusting unit is applied to the transmitted light region. This is because the flow amount can be made sufficiently large.
Here, the viscosity at 25 ° C. of the colored layer forming coating liquid is specifically preferably in the range of 2.0 mPa · s to 15.0 mPa · s, particularly 2.0 mPa · s. It is preferably within a range of s to 10.0 mPa · s, and particularly preferably within a range of 2.0 mPa · s to 8.0 mPa · s.
In addition, the viscosity at 40 ° C. of the colored layer forming coating solution is specifically preferably in the range of 1.5 mPa · s to 13 mPa · s, and more preferably 1.5 mPa · s to 8 It is preferably within a range of 0.0 mPa · s, and particularly preferably within a range of 1.5 mPa · s to 6.0 mPa · s. When the viscosity at each temperature of the colored layer forming coating solution is within the above range, the colored layer forming coating solution can have a large ratio of viscosity change to temperature change. For this reason, in the heating process to be described later, the amount of the colored layer forming coating solution on the optical path difference adjusting unit flowing into the transmitted light region can be made sufficiently large.

  The colored layer forming coating solution used in this step may contain other additives as necessary. Examples of such additives include photopolymerization initiators, sensitizers, coatability improvers, development improvers, crosslinking agents, polymerization inhibitors, plasticizers, flame retardants, and the like.

(2) Color filter substrate The color filter substrate used in this step has the transparent substrate and the optical path difference adjusting unit, and is further manufactured by the manufacturing method of the present invention. And a colored layer formed on the transparent base material and formed of the transparent resin so as to cover the optical path difference adjusting unit and including the photosensitive resin composition for the colored layer. In the color filter for a transflective liquid crystal display device, a region for reflected light is provided in a region where the transparent substrate, the optical path difference adjusting unit, and the colored layer are laminated, and the transparent substrate In the region where the colored layer is laminated, a transmitted light region is provided.

(I) Optical path difference adjustment part The optical path difference adjustment part contained in the color filter substrate used in this step is formed in a pattern on the reflected light region of the color filter substrate and is made of a transparent resin.

  The transparent resin that forms the optical path difference adjusting unit used in this step may have high transmittance with respect to external light incident on the color filter for a transflective liquid crystal display device and reflected light from which the external light is reflected. There is no particular limitation. Examples of such transparent resins include photosensitive acrylic resins, photosensitive polyimides, positive resists, cardo resins, polysiloxanes, benzocyclobutenes, and the like.

The film thickness of the optical path difference adjusting part used in this step is usually preferably in the range of 1.0 μm to 5.0 μm, and more preferably in the range of 2.0 μm to 4.5 μm. In particular, it is preferably in the range of 2.5 μm to 3.5 μm. Thereby, when the color filter for a transflective liquid crystal display device manufactured by the manufacturing method of the present invention is used for the transflective liquid crystal display device, the optical path difference between the reflected light region and the transmitted light region is adjusted. Because it becomes possible.
The film thickness of the optical path difference adjusting unit refers to the longest distance among the distances from the surface of the transparent base material to be described later to the apex of the optical path difference adjusting unit in the vertical direction.

  As a method for forming the optical path difference adjusting unit used in this step, any method can be used as long as it can be formed in a desired film thickness and in a desired pattern on a transparent substrate described later. Examples of a method for forming such an optical path difference adjusting unit include a photolithography method, a printing method, and an ink jet method.

(Ii) Transparent base material The transparent base material used in this step is not particularly limited as long as it can form the optical path difference adjusting portion and is a transparent substrate with respect to visible light. It can be the same as the transparent base material used for the color filter for transmissive liquid crystal display devices.

  As such a transparent substrate, specifically, a non-flexible transparent rigid material such as quartz glass, Pyrex (registered trademark) glass, synthetic quartz plate, transparent resin film, optical resin plate, etc. And a transparent flexible material having the above flexibility.

(Iii) Color filter substrate In addition to the transparent base material and the optical path difference adjusting unit, the color filter substrate used in this step is usually a light shielding unit that divides a pixel region of a color filter for a transflective liquid crystal display device. It is what has.

  The light-shielding part used in this step is formed in a pattern on the transparent substrate, and can be the same as that used as a light-shielding part in a general color filter.

  The pattern shape of the light shielding part is not particularly limited, and examples thereof include a stripe shape and a matrix shape.

Examples of the light-shielding portion include those obtained by dispersing or dissolving a black pigment in a binder resin, and metal thin films such as chromium and chromium oxide. This metal thin film may be a CrO _x film (x is an arbitrary number) and a laminate of two Cr films, and a CrO _x film (x is an arbitrary number) with a reduced reflectance. , CrN _y film (y is an arbitrary number) and three layers of Cr film may be laminated.

  When the light-shielding part is a material in which a black colorant is dispersed or dissolved in a binder resin, the method for forming the light-shielding part is not particularly limited as long as the light-shielding part can be patterned. Examples thereof include a photolithography method, a printing method, and an ink jet method using the photosensitive resin composition for the light shielding part.

In the case where the light shielding part is a dispersion or solution of a black colorant in a binder resin, and the printing method or the ink jet method is used as a method for forming the light shielding part, the binder resin may be, for example, polymethyl methacrylate Resin, polyacrylate resin, polycarbonate resin, polyvinyl alcohol resin, polyvinylpyrrolidone resin, hydroxyethyl cellulose resin, carboxymethyl cellulose resin, polyvinyl chloride resin, melamine resin, phenol resin, alkyd resin, epoxy resin, polyurethane resin, polyester resin, maleic acid Examples thereof include resins and polyamide resins.
In the above case, when a photolithography method is used as a method for forming the light shielding portion, the binder resin may be, for example, an acrylate-based, methacrylate-based, polyvinyl cinnamate-based, or cyclized rubber-based reactive material. A photosensitive resin having a vinyl group is used. In this case, a photopolymerization initiator may be added to the photosensitive resin composition for a light-shielding part containing a black colorant and a photosensitive resin, and further a sensitizer, a coating property improver, if necessary. A development improver, a crosslinking agent, a polymerization inhibitor, a plasticizer, a flame retardant, and the like may be added.

  On the other hand, when the light shielding part is a metal thin film, the method for forming the light shielding part is not particularly limited as long as the light shielding part can be patterned. For example, a photolithography method or a mask is used. The vapor deposition method, the printing method, etc. can be mentioned.

  The thickness of the light shielding portion is set to about 0.2 μm to 0.4 μm in the case of a metal thin film, and about 0.5 μm to 2 μm in the case where a black colorant is dispersed or dissolved in a binder resin. Is set.

(3) Application Step This step is a step of applying the colored layer forming coating solution so as to cover the optical path difference adjusting portion of the color filter substrate.

  In this step, as a method of applying the colored layer forming coating solution on the color filter substrate, the colored layer forming coating solution is uniformly applied on the optical path difference adjusting portion of the color filter substrate. Any method can be used as long as it can be applied, and a method generally used for forming a colored layer of a color filter can be used. Specifically, spin coating, spray coating, dip coating, roll coating, bead coating, and the like can be used.

In this step, the temperature of the colored layer forming coating solution when applying the colored layer forming coating solution is preferably within the range of 10 ° C to 30 ° C, and in particular, 20 ° C to 20 ° C. It is preferably within the range of 25 ° C. This is because, in cases other than the above range, it may be difficult to uniformly apply the colored layer forming coating solution onto the optical path difference adjusting unit.
Moreover, when apply | coating at temperature higher than the said range, it is necessary to make the viscosity at the time of application | coating into a predetermined range for uniform application | coating. For this reason, the viscosity of the coating liquid for forming the colored layer is higher at the same temperature than that used when coating at a temperature within the above range. As a result, in the heating step performed after this step, it becomes difficult to sufficiently increase the amount of the colored layer forming coating solution on the optical path difference adjusting unit flowing into the transmitted light region. Because. In addition, when the heating temperature in the heating process is set to a high temperature in order to increase the flow-in amount, the heating temperature in the pre-baking process is close to that, which may cause color unevenness in the colored layer.

  As the film thickness of the colored layer forming coating liquid in the reflected light region and the film thickness of the colored layer forming coating liquid in the transmitted light region immediately after being applied on the color filter substrate in this step, It is appropriately set depending on the film thickness of the optical path difference adjusting part, the content of the solvent contained in the colored layer forming coating solution, and the like.

  The film thickness of the colored layer forming coating solution in the reflected light region immediately after being applied on the color filter substrate in this step and the colored layer forming coating solution in the transmitted light region The ratio to the film thickness (reflected light region / transmitted light region) is appropriately set depending on the film thickness of the optical path difference adjusting unit, the content of the solvent contained in the colored layer forming coating solution, and the like. Is.

2. Heating step The heating step in the present invention is the optical path difference adjusting unit in order to cause the colored layer forming coating solution applied on the optical path difference adjusting unit to flow into the transmitted light region in the applying step. It is a step of heating the upper colored layer forming coating solution, and more specifically, the color filter substrate coated with the colored layer forming coating solution after the coating step is allowed to stand for a predetermined time. This is a step of performing so-called leaving while heating the colored layer forming coating solution applied on the optical path difference adjusting section into the transmitted light region of the color filter substrate.

In this step, examples of the heating method for heating the colored layer forming coating solution include a method using an oven, a far infrared heater, a hot plate, and the like.
In this step, among them, a method of heating the colored layer forming coating solution by standing the color filter substrate coated with the colored layer forming coating solution on a hot plate is preferable. . By using a hot plate to heat the colored layer forming coating solution, the amount of the colored layer forming coating solution on the optical path difference adjusting unit is uniformly flowed into the transmitted light region and This is because it is easy to make the thickness of the colored layer forming coating solution uniform. Moreover, it is because this process can be made simple.

In this step, the temperature for heating the colored layer forming coating solution is lower than the boiling point of the solvent contained in the colored layer forming coating solution, and in the prebaking step described later, the colored layer forming layer described later is used. It is preferable that the temperature is lower than the heating temperature within a range of 20 ° C to 100 ° C, particularly within a range of 20 ° C to 70 ° C. The difference between the temperature for heating the colored layer forming coating solution in the heating step and the temperature for heating the colored layer forming layer described later in the prebaking step is larger than the above range, that is, in the heating step. If the heating temperature is too low, it may be difficult to flow a sufficient amount of the colored layer forming coating solution on the optical path difference adjusting unit into the transmitted light region. This is because if the heating temperature in the heating step is smaller than the range, that is, if the heating temperature in the prebaking step is close to the heating temperature in the prebaking step, color unevenness may occur in the colored layer manufactured by the manufacturing method of the present invention.
In addition, the temperature which heats the said coating liquid for colored layer formation means the average temperature of the whole coating liquid for said colored layer formation which reached | attained by implementing this process, and is for said colored layer formation It is not the temperature of the device that heats the coating liquid.

In this step, as the time for heating the colored layer forming coating solution, a desired amount of the colored layer forming coating solution on the optical path difference adjusting unit is allowed to flow into the transmitted light region of the color filter substrate. Anything can be used. Specifically, it is sufficient that the colored layer forming coating solution is heated for at least a time during which it can reach a predetermined temperature. In this step, it is particularly preferable that the time is such that the colored layer forming coating solution is heated to reach a predetermined temperature. This is because the amount of the colored layer forming coating liquid flowing into the transmitted light region on the optical path difference adjusting portion does not change even if the liquid is allowed to stand for a time that can reach the predetermined temperature. For this reason, it is because productivity can be aimed at by setting it as time which can be made to reach predetermined temperature.
Such heating time varies depending on the heating method, but specifically, it is preferably in the range of 1.0 minute to 15.0 minutes, and more preferably 1.0 minute to 10.0. It is preferably within a range of minutes, and particularly preferably within a range of 3.0 minutes to 8.0 minutes. This is because if it is shorter than the above range, it may be difficult to heat to a desired temperature, and even if it is longer than the above range, the effect does not change and the productivity may decrease.

  In this step, as the thickness of the colored layer forming coating liquid in the reflected light region and the thickness of the colored layer forming coating liquid in the transmitted light region after the holding while heating is completed, The film thickness of the optical path difference adjusting unit, the content of the solvent contained in the colored layer forming coating solution, and the like are appropriately set.

  In addition, in this step, the thickness of the colored layer forming coating solution in the reflected light region and the colored layer forming coating solution in the transmitted light region after the heating and placing are finished. The ratio to the film thickness (reflected light region / transmitted light region) is appropriately set depending on the film thickness of the optical path difference adjusting unit, the content of the solvent contained in the colored layer forming coating solution, and the like. Is.

3. Drying Step The drying step in the present invention is a step of forming a colored layer forming layer by removing the solvent contained in the colored layer forming coating solution after the heating step by drying under reduced pressure.

  In this step, the degree of reduced pressure when removing the solvent can be appropriately set according to the content of the solvent constituting the colored layer forming coating solution.

In this step, the solvent may be removed while heating the colored layer forming coating solution. This is because the drying time can be shortened.
Moreover, you may pre-heat the said coating liquid for colored layer formation before drying under reduced pressure as needed.

4). Prebaking process The prebaking process in this invention is a process of solidifying the said layer for colored layer formation by heating the layer for color layer formation on the board | substrate for color filters formed of the said drying process.

  In this step, as a method for heating the colored layer forming layer, the same method as that used for forming a colored layer of a general color filter can be used. Specifically, a method similar to the method described in the above section “2. Heating step” can be used.

In this step, the temperature for heating the colored layer forming layer is preferably in the range of 80 ° C to 110 ° C, and more preferably in the range of 80 ° C to 100 ° C. It is because the said layer for colored layer formation can fully solidify because it is the said range.
The temperature at which the colored layer forming layer is heated means the average temperature of the entire colored layer forming layer reached by carrying out this step, and the colored layer forming layer is heated. It is not the temperature of the device.

In this step, after the heating is finished, the thickness of the colored layer forming layer in the reflected light region and the thickness of the colored layer forming layer in the transmitted light region are as follows. The film thickness of the application layer is preferably in the range of 0.1 μm to 2.0 μm, and more preferably in the range of 0.2 μm to 1.5 μm.
The thickness of the colored layer forming layer in the transmitted light region is preferably in the range of 0.5 μm to 8.0 μm, and more preferably in the range of 1.0 μm to 5.0 μm. . By being within the above range, the color filter for the transflective liquid crystal display device manufactured by the manufacturing method of the present invention has a difference in film thickness between the colored layer in the transmitted light region and the colored layer in the reflected light region. This is because it can be large.

  Further, in this step, the ratio of the thickness of the colored layer forming layer in the transmitted light region to the thickness of the colored layer forming layer in the reflected light region after heating is finished (for transmitted light). (Region / region for reflected light) is preferably in the range of 1.4 to 7.0, and more preferably in the range of 1.8 to 3.3. By being within the above range, the color filter for the transflective liquid crystal display device manufactured by the manufacturing method of the present invention has a difference in film thickness between the colored layer in the transmitted light region and the colored layer in the reflected light region. This is because it can be large.

5. Manufacturing method of color filter for transflective liquid crystal display device The manufacturing method of the color filter for transflective liquid crystal display device of the present invention includes at least the coating step, the heating step, the drying step, and the pre-baking step in this order. Usually, after these steps, the colored layer forming layer formed on the color filter substrate is exposed to a pattern and developed to form a patterned colored layer. -It has a development process.
Moreover, when the colored layer of the color filter for a transflective liquid crystal display device manufactured by the manufacturing method of the present invention is formed by a colored pattern of two or more colors, the above-described color pattern for each color is described above. A coating process, a heating process, a drying process, a pre-baking process, and an exposure / development process are performed in this order.

In the exposure / development step, the colored layer forming layer is exposed in a pattern, and the unexposed portion is removed by development to form a patterned colored layer. The method used for forming can be used.
Further, if necessary, a halftone mask having regions with different transmittances is used as a mask during exposure, and the difference in thickness between the colored layer in the reflected light region and the colored layer in the transmitted light region is further increased. It is good as a thing.

6). Color filter for transflective liquid crystal display device The color filter for transflective liquid crystal display device manufactured by the manufacturing method of the present invention is formed on a transparent base material and the transparent base material, and the optical path difference adjustment is made of a transparent resin. And a colored layer including the photosensitive resin composition for a colored layer, the transparent substrate, the optical path difference adjusting unit, and the colored layer. The laminated region is used as the reflected light region, and the region where the transparent base material and the colored layer are laminated is used as the transmitted light region.
In the color filter for a transflective liquid crystal display device manufactured by the manufacturing method of the present invention, the thickness of the colored layer in the reflected light region and the thickness of the colored layer in the transmitted light region are the reflected light region. The thickness of the colored layer is preferably in the range of 0.1 μm to 1.6 μm, and more preferably in the range of 0.2 μm to 1.2 μm.
In addition, the thickness of the colored layer in the transmitted light region is preferably in the range of 0.5 μm to 6.5 μm, and more preferably in the range of 1.0 μm to 4.0 μm. By being within the above range, when the color filter for a transflective liquid crystal display device is used in a transflective liquid crystal display device, the luminance during reflective display can be increased.

  Further, in the color filter for a transflective liquid crystal display device, the ratio of the thickness of the colored layer in the transmitted light region to the thickness of the colored layer in the reflected light region (transmitted light region / reflected light region). The region is preferably in the range of 1.4 to 7.0, and more preferably in the range of 1.8 to 3.3. By being within the above range, when the color filter for a transflective liquid crystal display device is used in a transflective liquid crystal display device, the luminance during reflective display can be increased.

  Examples of the use of such a color filter for a transflective liquid crystal display device include a color filter used in a transflective liquid crystal display device. Especially, it is used suitably for the color filter used for the transflective liquid crystal display device by which the high brightness | luminance at the time of reflective display is requested | required.

B. Next, an apparatus for producing a color filter for a transflective liquid crystal display device according to the present invention will be described.
The apparatus for producing a color filter for a transflective liquid crystal display device according to the present invention covers a transparent base material, an optical path difference adjusting portion formed on the transparent base material and made of a transparent resin, and the optical path difference adjusting portion. A colored layer containing a photosensitive resin composition for a colored layer, and a region where the transparent substrate, the optical path difference adjusting unit, and the colored layer are laminated is used as a reflected light region, An apparatus for producing a color filter for a transflective liquid crystal display device using a region in which the transparent substrate and the colored layer are laminated as a region for transmitted light, the transparent substrate and the transparent substrate on the transparent substrate A coating means for applying a coating solution for forming a colored layer containing a photosensitive resin composition for a colored layer so as to cover the optical path difference adjusting portion of the color filter substrate having the formed optical path difference adjusting portion; and The colored layer forming coating liquid applied on the optical path difference adjusting unit, The heating means for heating the coating liquid for forming the colored layer on the optical path difference adjusting unit and the coating liquid for forming the colored layer after being heated by the heating means for flowing into the transmitted light region. A drying means for drying under reduced pressure to form a colored layer forming layer and a pre-baking means for heating the colored layer forming layer formed by the drying means are successively arranged in this order. It is what.

  An apparatus for producing such a color filter for a transflective liquid crystal display device of the present invention will be described with reference to the drawings. FIG. 2 is a schematic diagram showing an example of a color filter manufacturing apparatus for a transflective liquid crystal display device according to the present invention. 2, the color filter manufacturing apparatus 40 for a transflective liquid crystal display device according to the present invention includes a color filter substrate having the transparent base material and an optical path difference adjusting unit formed on the transparent base material. Coating means 41 for applying a coating liquid for forming a colored layer containing a photosensitive resin composition for a colored layer so as to cover 20 optical path difference adjusting parts, and formation of a colored layer applied on the optical path difference adjusting part Heating means 42 for heating the colored layer forming coating solution on the optical path difference adjusting unit, and the colored layer forming coating solution to cause the coating solution to flow into the transmitted light region. A drying means 43 for drying under reduced pressure to form a colored layer forming layer and a pre-baking means 44 for heating the colored layer forming layer are successively arranged in this order. Further, the color filter for a transflective liquid crystal display device having a pattern-like colored layer by having exposure / developing means 45 for exposing the colored layer-forming layer in a pattern and then developing with a developer. 10 is formed. Further, the color filter manufacturing apparatus 40 for the transflective liquid crystal display device uses the color filter substrate 20 of the coating means 41, the heating means 42, the drying means 43, the pre-baking means 44, and the exposure / developing means 45. It has the belt conveyor 46 conveyed in order.

  According to the present invention, the colored layer forming coating solution on the optical path difference adjusting unit is used to cause the colored layer forming coating solution applied on the optical path difference adjusting unit to flow into the transmitted light region. The color filter for the transflective liquid crystal display manufactured by the manufacturing apparatus of the present invention is provided for the reflected light by having the heating means for performing the heating between the coating means and the drying means. The difference in film thickness between the colored layer in the region and the colored layer in the transmitted light region can be large. Further, the color filter for a transflective liquid crystal display device can be made excellent in the uniformity of the thickness of the colored layer in the reflected light region.

The apparatus for producing a color filter for a transflective liquid crystal display device of the present invention has at least a coating means, a heating means, a drying means, and a pre-baking means.
Hereinafter, each structure of the manufacturing apparatus of the color filter for transflective liquid crystal display devices of this invention is demonstrated.

1. Coating means The coating means used in the present invention is a colored layer so as to cover the optical path difference adjusting portion of the color filter substrate having the transparent base material and the optical path difference adjusting portion formed on the transparent base material. A coating solution for forming a colored layer containing the photosensitive resin composition for coating is applied.

  In such a coating means, it is formed as a coating means for applying a colored layer forming coating solution containing a photosensitive resin composition for a colored layer so as to cover the optical path difference adjusting portion of the color filter substrate. Any means that can make the thickness of the coating solution for forming the colored layer in the reflected light region uniform, specifically, spin coating, spray coating, dip coating, roll coating, bead coating, etc. Can be used.

  The colored layer forming coating liquid applied by the coating means used in the present invention, and the color filter substrate to which the coating means is to be coated with the colored layer forming coating liquid, are transparent base materials. And a color filter substrate having a light path difference adjusting portion formed on the transparent substrate and a colored layer forming coating solution generally used for forming a colored layer of a color filter can be used. Specifically, the same materials as those described in “1. Application process” of “A. Method for producing color filter for transflective liquid crystal display device” can be used.

2. Heating means The heating means used in the present invention is a colored layer on the optical path difference adjusting unit in order to cause the colored layer forming coating solution applied on the optical path difference adjusting unit to flow into the transmitted light region. The forming coating solution is heated.

  Such a heating means is not particularly limited as long as the colored layer forming coating solution can be uniformly heated, and examples thereof include an oven, a far infrared heater, a hot plate, and the like. . In the present invention, a hot plate is particularly preferable. It is easy to equalize the amount of the colored layer forming coating solution applied on the optical path difference adjusting portion to flow into the transmitted light region and the thickness of the colored layer forming coating solution. In addition, the heating means can be further simplified.

When the heating means is a hot plate, the heating means may have one hot plate or a plurality of hot plates.
As a specific example in the case where the heating means has a plurality of hot plates, as illustrated in FIG. 3, as illustrated in FIG. 3, hot plates 52 stacked in multiple stages in the height direction and arranged so as to overlap in plan view. Can be mentioned. In this case, the color filter substrate coated with the colored layer forming coating solution can be gripped and moved up and down by the application means, and the color filter substrate is disposed on the hot plate 52. The color filter substrate 20 is allowed to stand on the hot plate 52 by the handling robot 47 that can perform the heating, and the colored layer forming coating solution on the optical path difference adjusting unit is heated.

Further, as another example of the heating means, as illustrated in FIG. 4, there can be mentioned one composed of a hot plate 52 arranged so as not to overlap in plan view. Here, the hot plate 52 is moved by the belt conveyor 46. In this case, the color filter substrate 20 coated with the coating liquid for forming the colored layer is gripped by the coating means and moved to a place where the hot plate 52 is disposed, and the color filter substrate is placed on the hot plate 52. The color filter substrate 20 is allowed to stand on the hot plate 52 by the handling robot 47 capable of arranging the substrate, and the colored layer forming coating solution on the optical path difference adjusting unit is heated. Thereafter, the color filter substrate 20 that has been heated is transported by the handling robot 47 to the drying process, which is the next process.
The hot plate may be fixed at a predetermined position, or may be movable.

  The heating ability of the heating means used in the present invention is not limited as long as it can be heated to a temperature at which the colored layer forming coating liquid can be reduced to a desired viscosity. It can be heated to the same temperature as the temperature for heating the colored layer forming coating solution described in the section “2. Heating step” of “A. Method for producing color filter for transflective liquid crystal display device”. Preferably there is.

3. Drying means The drying means used in the present invention comprises drying the colored layer forming coating solution heated by the heating means under reduced pressure, removing the solvent contained in the colored layer forming coating solution, and A forming layer is formed.

  The degree of vacuum when the colored layer forming coating solution is dried under reduced pressure by the drying means used in the present invention is appropriately set according to the content of the solvent contained in the colored layer forming coating solution. Can do.

  Moreover, the drying means used in the present invention may be a batch process or a continuous process for removing the solvent from the colored layer forming coating solution.

  The drying means used in the present invention may have a heating device that heats the colored layer forming coating solution, if necessary. This is because the drying time can be shortened. As such a heating device, a known heating device can be used, and specifically, a far infrared heater, a hot plate, or the like can be used.

4). Pre-baking means The pre-baking means in the present invention solidifies the colored layer forming layer by heating the colored layer forming layer formed by the drying means.

  As the pre-baking means used in the present invention, the same one as used for forming a colored layer of a general color filter can be used, and specifically, an oven, a far-infrared heater, a hot plate and the like can be mentioned. be able to.

  The heating capability of the colored layer forming layer of the pre-baking means is not limited as long as it can be heated to a temperature at which the colored layer forming layer can be baked and hardened to a desired hardness. It is preferable that the film can be heated to a temperature similar to the temperature for heating the colored layer forming layer described in the section “4. Pre-baking step” of “Method for producing color filter for liquid crystal display device”.

  The thickness of the colored layer forming layer after solidification formed by the pre-baking means is described in “4. Pre-baking step” in “A. Method for producing color filter for transflective liquid crystal display device”. Since it is the same content as what was described, description here is abbreviate | omitted.

5. Manufacturing apparatus for color filter for transflective liquid crystal display device The manufacturing apparatus for a color filter for transflective liquid crystal display device of the present invention has at least the coating means, heating means, drying means, and pre-baking means. Usually, the color layer forming layer of the color filter substrate after the pre-baking means is exposed to a pattern and developed to form a patterned colored layer.

  The exposure / development means may be any one that can accurately form a patterned colored layer by exposing the colored layer forming layer in a pattern and removing unexposed portions by development. An exposure / development means used for forming a colored layer of a general color filter can be used.

  The transflective liquid crystal display device color filter manufacturing apparatus includes the color filter substrate that is transferred by a known transfer means, specifically, a transfer roller, a belt conveyor, a handling robot, and the like. You may move between each means of a drying means and a prebaking means.

  Further, as a color filter for a transflective liquid crystal display device manufactured by the manufacturing apparatus of the present invention, “6. Transflective liquid crystal display device” in “A. Manufacturing method of color filter for transflective liquid crystal display device” described above. Since the thing similar to what was described in the term of "color filter for use" can be used, description here is abbreviate | omitted.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.

Hereinafter, the present invention will be specifically described with reference to examples.
[Example 1]
1. Photosensitive resin layer forming step A 300 mm × 400 mm transparent substrate having a thickness of 0.7 mm and an i-line transmittance of 91% was prepared, and this substrate was washed according to a conventional method. On this transparent substrate, a transparent resin prepared according to the component composition shown below was applied and dried under reduced pressure.

(Photosensitive resin composition for forming transparent resin layer)
・ Methyl methacrylate-styrene-acrylic acid copolymer 42 parts by weight ・ Epicoat 180s70 (Japan Epoxy Resin Co., Ltd.) 18 parts by weight ・ Dipentaerythritol pentaacrylate 32 parts by weight ・ Irgacure 907 (manufactured by Ciba Specialty Chemicals) 8 parts by weight ・ Propylene glycol monomethyl ether acetate 300 parts by weight

Next, after heating for 180 seconds on a hot plate at 80 ° C., exposure is performed from the photosensitive resin layer side using a predetermined photomask with a proximity exposure machine (TME-400R manufactured by Topcon Corporation). went. The photomask was made of quartz glass, and a photomask having a predetermined pattern drawn on the chromium oxide film on the surface was used. A high pressure mercury lamp was used as the light source, and the conditions were an exposure amount of 100 mJ / cm ² (wavelength 365 nm). Development was performed using a KOH-based alkaline developer, and baking was performed in an oven at 200 ° C. for 30 minutes. Thereby, a transparent resin layer having a line width of 40 μm and a film thickness of 3.0 μm was formed.

2. Colored layer formation process The green colored layer resin composition prepared according to the component composition shown below was apply | coated on the said transparent substrate.

(Photosensitive resin composition for forming a green colored layer)
Green pigment (Avisia Monastral Green θY-C) 4.2 parts by weight Yellow pigment (BASF Pariotor Yellow D1819) 1.8 parts by weight Dispersant (Bicchemy Disperbic 161) 3.0 Part by weight / monomer (SR399 manufactured by Sartomer) 4.0 part by weight Polymer II 5.0 part by weight Irgacure 907 (Ciba Specialty Chemicals) 1.4 part by weight (2,2′bis (o- Chlorophenyl) -4,5,4 ′, 5′-tetraphenyl-1,2′-biimidazole) 0.6 part by weight / propylene glycol monomethyl ether acetate 80.0 parts by weight

Next, heating was performed on a hot plate at 40 ° C. for 5 minutes, followed by drying under reduced pressure. Then, after heating (prebaking) for 180 seconds on an 80 degreeC hotplate, it exposed from the photosensitive resin layer side using the predetermined photomask with the proximity exposure machine. The conditions were an exposure amount of 100 mJ / cm ² (wavelength 365 nm). Development was performed using a KOH-based alkaline developer, and baking was performed in an oven at 200 ° C. for 30 minutes.
The thickness of the obtained colored layer for reflected light was 1.2 μm, and the thickness of the colored layer for transmitted light was 2.1 μm. The ratio of the thickness of the colored layer in the transmitted light region to the thickness of the colored layer in the reflected light region (transmitted light region / reflected light region) was 1.8.

[Example 2]
1. Photosensitive resin layer forming step A transparent resin layer having a line width of 40 μm and a film thickness of 3.0 μm was prepared in the same manner as in Example 1 using the photosensitive resin composition for forming a transparent resin layer having the same composition as in Example 1. Formed.

2. Colored layer forming step A green colored layer resin composition having the same component composition as in Example 1 was applied, heated on a hot plate at 50 ° C. for 5 minutes, and then dried under reduced pressure. Thereafter, heating (pre-baking) was performed on a hot plate at 80 ° C. for 180 seconds, and exposure was performed from the photosensitive resin layer side using a predetermined photomask with a proximity exposure machine. The conditions were an exposure amount of 100 mJ / cm ² (wavelength 365 nm). Development was performed using a KOH-based alkaline developer, and baking was performed in an oven at 200 ° C. for 30 minutes.
The thickness of the obtained colored layer for reflected light was 1.1 μm, and the thickness of the colored layer for transmitted light was 2.1 μm. The ratio of the thickness of the colored layer in the transmitted light region to the thickness of the colored layer in the reflected light region (transmitted light region / reflected light region) was 1.9.

[Comparative Example 1]
1. Photosensitive resin layer forming step A transparent resin layer having a line width of 40 μm and a film thickness of 3.0 μm was prepared in the same manner as in Example 1 using the photosensitive resin composition for forming a transparent resin layer having the same composition as in Example 1. Formed.

2. Colored layer forming step A green colored layer resin composition having the same component composition as in Example 1 was applied, and then allowed to stand at room temperature for 5 minutes without heating, and then dried under reduced pressure. Thereafter, heating (pre-baking) was performed on a hot plate at 80 ° C. for 180 seconds, and exposure was performed from the photosensitive resin layer side using a predetermined photomask with a proximity exposure machine. The conditions were an exposure amount of 100 mJ / cm ² (wavelength 365 nm). Development was performed using a KOH-based alkaline developer, and baking was performed in an oven at 200 ° C. for 30 minutes.
The thickness of the obtained colored layer for reflected light was 1.6 μm, and the thickness of the colored layer for transmitted light was 2.1 μm. The ratio of the thickness of the colored layer in the transmitted light region to the thickness of the colored layer in the reflected light region (transmitted light region / reflected light region) was 1.3.

  As described above, in Examples 1 and 2, the colored layer in the reflected light region can be made thinner than in Comparative Example 1.

It is process drawing which shows an example of the manufacturing method of the color filter for transflective liquid crystal display devices of this invention. It is the schematic which shows an example of the manufacturing apparatus of the color filter for transflective liquid crystal display devices of this invention. It is the schematic which shows an example of the heating means used for this invention. It is the schematic which shows the other example of the heating means used for this invention. It is a schematic sectional drawing which shows an example of the color filter for general transflective liquid crystal display devices.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 101 ... Transparent base material 2, 102 ... Optical path difference adjustment part 3 ... Red colored layer forming coating liquid 4 ... Red colored layer forming layer 5R, 5G, 5B ... Red colored pattern, green colored pattern, blue colored pattern 6, 106 ... Colored layer 10, 100 ... Color filter for transflective liquid crystal display device 20 ... Substrate for color filter 30 ... Photomask 31 ... Opening region 32 ... Light-shielding region 40 ... Production of color filter for transflective liquid crystal display device Apparatus 41 ... Application means 42 ... Heating means 43 ... Drying means 44 ... Pre-baking means 45 ... Exposure / development means 52 ... Hot plate

Claims (6)

A transparent substrate, an optical path difference adjusting unit formed on the transparent substrate and made of a transparent resin, and a colored layer formed so as to cover the optical path difference adjusting unit and containing the photosensitive resin composition for the colored layer. Then, the region where the transparent base material, the optical path difference adjusting unit, and the colored layer are laminated is used as a reflected light region, and the region where the transparent base material and the colored layer are laminated is transmitted light. A method for producing a color filter for a transflective liquid crystal display device used as an area for use,
Formation of a colored layer containing a photosensitive resin composition for a colored layer so as to cover the optical path difference adjusting part of the color filter substrate having the transparent base material and an optical path difference adjusting part formed on the transparent base material An application process for applying a coating liquid;
Heating that heats the colored layer forming coating solution on the optical path difference adjusting unit so that the colored layer forming coating solution applied on the optical path difference adjusting unit flows into the transmitted light region. Process,
A drying step of drying the colored layer forming coating liquid after the heating step under reduced pressure to form a colored layer forming layer;
A pre-baking step of heating the colored layer forming layer formed by the drying step;
A method for producing a color filter for a transflective liquid crystal display device, comprising:   The temperature for heating the colored layer forming coating solution in the heating step is lower in a range of 20 ° C. to 100 ° C. than the temperature for heating the colored layer forming layer in the pre-baking step. A method for producing a color filter for a transflective liquid crystal display device according to claim 1.   The heating step heats the colored layer forming coating solution by allowing the color filter substrate coated with the colored layer forming coating solution to stand on a hot plate. A method for producing a color filter for a transflective liquid crystal display device according to claim 1 or 2.   The viscosity difference between 25 ° C. and 40 ° C. of the colored layer forming coating solution is in the range of 0.2 mPa · s to 4.0 mPa · s. A method for producing a color filter for a transflective liquid crystal display device according to any one of the preceding claims. A transparent base material, an optical path difference adjusting part formed on the transparent base material and made of a transparent resin, and a colored layer formed so as to cover the optical path difference adjusting part and containing a photosensitive resin composition for a colored layer The transparent substrate, the optical path difference adjusting unit, and the region where the colored layer is laminated are used as a region for reflected light, and the region where the transparent substrate and the colored layer are laminated is transmitted. An apparatus for producing a color filter for a transflective liquid crystal display device used as a light region,
Formation of a colored layer containing a photosensitive resin composition for a colored layer so as to cover the optical path difference adjusting part of the color filter substrate having the transparent base material and an optical path difference adjusting part formed on the transparent base material An application means for applying a coating liquid;
Heating that heats the colored layer forming coating solution on the optical path difference adjusting unit so that the colored layer forming coating solution applied on the optical path difference adjusting unit flows into the transmitted light region. Means,
Drying means for drying the colored layer forming coating liquid after heating by the heating means to form a colored layer forming layer;
An apparatus for producing a color filter for a transflective liquid crystal display device, wherein pre-baking means for heating the colored layer forming layer formed by the drying means is continuously arranged in this order.   6. The color filter manufacturing apparatus for a transflective liquid crystal display device according to claim 5, wherein the heating means is a hot plate.

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