JP2009294415A - Method of producing color filter formation substrate, color filter produced by using the production method, and member for display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of producing a color filter formation substrate where, using a substrate made of a plastic film as a base material, a color filter formation substrate used for a display member such as a panel for color display is produced, wherein performance maintenance of the color filter formation substrate and its production in a low temperature process are made compatible, and further, a running cost is suppressed. <P>SOLUTION: In the method for producing a color filter formation substrate where color filters composed of colored layers are arranged at one side of a base material composed of a plastic film substrate having flexibility by an ink jet system, using ink for ink jet, as the main solvent, comprising a solvent component having a boiling point of 180 to 260°C and also whose vapor pressure at ordinary temperature is ≤0.5 mmHg in the ratio of ≥80 wt.% based on the whole quantity of the solvent, heating formation of the colored layers is performed at a temperature lower than the boiling point of the main solvent of the ink for ink jet and also at the heat resistant temperature of the base material. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a color filter substrate which is a constituent member of a display member such as a display panel used as a display unit, such as a liquid crystal display, a plasma display, a computer terminal, an organic EL display, an electronic paper display, and a mobile phone, and its manufacture. More particularly, the present invention relates to a thin and lightweight color filter forming substrate using a plastic film substrate and a method for manufacturing the same.

Display panels for color display using liquid crystal are widely used from small areas such as for portable terminals and cameras to large areas such as for computer terminals and televisions. As a result, the display quality has been further improved.
In such a color display panel, a color filter having a role of improving the image quality or giving each pixel a color of each primary color is arranged on one surface of the substrate. ,It has been incorporated.
As a method for producing the color filter, conventionally, the radiation-sensitive resin coating film is irradiated with radiation through a photomask to cure the radiation-irradiated portion, and then subjected to development treatment, whereby the coating film radiation is irradiated. After removing the part that has not been irradiated with a pattern to form a pattern, a first method of dyeing (also called a dyeing method) or a composition in which a red, green, or blue colorant is dispersed in a radiation-sensitive resin And a second method (also referred to as a pigment dispersion method) in which coating film formation, radiation irradiation and development treatment are performed in the same manner as described above.
However, these methods have a problem that the color filter forming process is complicated and the manufacturing cost is high.

On the other hand, JP-A-59-75205 (Patent Document 1), JP-A-61-245106 (Patent Document 2), JP-A-63-235901 (Patent Document 3) and the like include an inkjet head. A third method, which is a method for producing a color filter by an ink jet method, in which a color filter ink (hereinafter also referred to as an ink jet ink) is disposed on one surface of a base material to form a color filter composed of a colored layer. Is disclosed.
This third method is advantageous in that it is easy to control the position at which the droplets of the color filter resin composition are ejected and the waste of the resin composition is reduced, so that the manufacturing cost can be reduced.
Conventionally, in the color filter manufacturing method according to the third method, since the color density of the discharged color filter forming resin composition may be uneven, in recent years, Japanese Patent Laid-Open No. 4-261503 (Patent Document 4). ), As disclosed in JP-A-7-318723 (Patent Document 5) and the like, it has been proposed to adjust the discharge amount of the color filter composition to suppress unevenness in the color density of the pixel pattern.
Also, Japanese Patent No. 3940523 (Patent Document 6) has a problem in the color filter manufacturing method according to the third method that, as the area of the pixel pattern becomes smaller, the used inkjet head is clogged. Thus, it has been found that it is required to discharge the droplets of the resin composition for the color filter with good straightness without clogging the used inkjet head, and the color filter according to the third method In the manufacturing method, as a technical problem to eliminate clogging associated with the miniaturization of the area of the pixel pattern, in order to solve this, while reducing the drying speed of the droplets at the time of discharging the resin composition for the color filter, It has proposed a resin composition for forming a color filter that can suppress an excessive increase in the viscosity of droplets due to drying and prevent precipitation of solids.
JP 59-75205 A JP-A-61-245106 JP-A 63-235901 JP-A-4-261503 JP 7-318723 A Japanese Patent No. 3940523

On the other hand, in recent years, research and development of so-called electronic paper displays and organic EL displays as next-generation display devices having flexibility that can be bent have been actively conducted. As a base material for a color filter substrate for full color generation display devices, a plastic film has been used as a base material instead of a conventional glass substrate.
However, when a plastic film is used as a substrate, there is a basic limitation that a color filter cannot be formed at a high temperature due to the heat resistance characteristics of the plastic film (heat resistance temperature is about 150 ° C., for example).
When a plastic film substrate is used in a liquid crystal display (also referred to as a liquid crystal display device), if the color filter is produced at a temperature higher than the heat resistant temperature of the film substrate in order to maintain the liquid crystal voltage holding performance of the color filter, a dimensional change occurs. In addition, the soft film substrate is warped, and if it is manufactured at a temperature lower than or equal to the heat resistant temperature, the voltage holding rate and durability of the liquid crystal in the case of a display panel are lowered. There was a limit to maintaining both performance and low temperature process.
Although a method of forming a color filter by evaporating the solvent in the color material by heating for a long time of about 24 hours near the heat-resistant temperature is considered, there are problems such as an increase in running cost.
The heat-resistant temperature mentioned here means a temperature at which a dimensional change does not occur at a practical level although it varies depending on the substrate.

Thus, in recent years, a plastic film substrate (hereinafter also referred to as a film substrate) has been used as a base material instead of a conventional glass substrate in order to reduce the thickness and weight of a display device. However, when a plastic film substrate is used, there is a basic limitation that a color filter composed of a colored layer cannot be formed at a high temperature due to the heat resistance characteristics of the plastic film. When a color filter is produced, there is a problem that the film substrate is warped.
Further, when a color filter composed of a colored layer is produced at a temperature lower than the heat-resistant temperature, there arises a problem that the voltage holding ratio and durability of the liquid crystal are lowered.
On the other hand, a method of evaporating the solvent in the color material to form a color filter composed of a colored layer by heating for about 24 hours near the heat-resistant temperature can be considered, but this method has problems such as an increase in running cost. is there.
The present invention addresses these problems, and in particular, a color for producing a color filter forming substrate used for a display panel by using a plastic film substrate as a base material by the inkjet method of the third method. A method of manufacturing a filter forming substrate, which can maintain both the voltage holding performance of liquid crystal of the color filter forming substrate and the production in a low temperature process, and can further reduce the running cost. It is intended to provide a manufacturing method.
In particular, when used when producing a display panel for color display for a liquid crystal display, the soft film substrate does not warp, and the voltage holding ratio and durability of the liquid crystal do not decrease. It is an object of the present invention to provide a method for manufacturing a color filter forming substrate that can reduce running costs.
At the same time, an object of the present invention is to provide a color filter forming substrate manufactured by such a method for manufacturing a color filter forming substrate and a display member such as a display panel using the color filter forming substrate.

In the method for producing a color filter forming substrate of the present invention, a plastic film substrate having flexibility is used as a base material, and a color filter composed of a colored layer in order from the base material side and a protective layer are disposed on one side of the base material. A method of manufacturing a color filter forming substrate for producing a color filter forming substrate, comprising: a partition forming step of sequentially forming a light-blocking partition on one surface of the base material; and a partition formed by the partition forming step. A colored layer forming step in which an inkjet ink for forming the colored layer is arranged in the partitioned concave portion by an inkjet method, and the colored layer to be a color filter is heated by heating the inkjet ink; and A protective film forming step of forming a protective film, wherein the colored layer forming step has a boiling point of 180 as a main solvent. Ink-jet ink containing a solvent component having a vapor pressure of ˜260 ° C. and a vapor pressure of 0.5 mmHg or less at normal temperature in a proportion of 80% by weight or more based on the total amount of the solvent, and disposed in the recess The colored layer is heated and formed at a temperature lower than the boiling point of the main solvent and at the heat resistant temperature of the substrate.
And it is a manufacturing method of said color filter formation board | substrate, Comprising: The heating formation temperature which is the temperature at the time of heat-forming the said colored layer is the range of 100 to 180 degreeC, and heating formation time is 1 hour-3 hours. It is characterized by doing.
In addition, in the method for manufacturing a color filter forming substrate, the main solvent of the ink-jet ink is diethylene glycol mono-n-butyl ether acetate.
Further, in any one of the above-described methods for producing a color filter forming substrate, the plastic film substrate having a heat-resisting dimensional change rate at the heating forming temperature in the range of −0.05% to + 0.05% as the base material. It is characterized by using.
Further, in any one of the above-described methods for manufacturing a color filter forming substrate, the heating in the protective film forming step is performed at a temperature equal to or lower than the temperature for forming the colored layer.

The color filter forming substrate referred to here is a member for a display device in which a color filter is formed on one surface of a plastic film substrate that is a base material, or an intermediate product of a plastic film substrate that is a base material for a color filter. It means a member formed on one surface.
Further, the heat formation referred to here generally corresponds to post-baking, and the resin of the ink for ink jet and the solvent removal (evaporation) are performed by heating.
As described above, the heat-resistant temperature mentioned here means a temperature at which a dimensional change does not occur at a practical level although it varies depending on the substrate.
Moreover, the heat-resistant dimension change rate said here means the value of the dimension change rate in heating formation, for example, it measures with the following measuring methods.
Fine cross-shaped markings are applied to the four corners of a 100 mm × 100 mm square test piece so that the distance between adjacent markings is 80 mm, and the distance between the markings is measured.
The test piece is heated in an oven at the temperature of heat formation for 60 minutes, left to cool in a constant temperature and humidity chamber at 23 ° C. and 38% RH for 1 hour, and the distance between the markings is measured again.
The heat resistant dimensional change rate is calculated based on the following formula.
Distance between markings before heating: a (μm)
Distance between markings after heating and standing: b (μm)
Heat resistant dimensional change rate c (%) = (ba) × 100 / a
The heat-resistant dimensional stability test is set in consideration of processing conditions when a flexible color filter and a TFT array are manufactured using a flexible substrate.
That is, when a flexible color filter or TFT array is manufactured using a flexible substrate, the substrate is heated for about 60 minutes near the temperature of the heating formation.

The color filter forming substrate of the present invention is a color filter in which a plastic film substrate having flexibility is used as a base material, and a color filter composed of a colored layer and a protective film are arranged on one side of the base material in order from the substrate side. It is a formation board | substrate, Comprising: It was produced by the manufacturing method of the color filter formation board | substrate of any one of Claim 1 thru | or 5, The said colored layer is the recessed part divided by the partition which has light-shielding property. It is formed by heating.
In addition, when the color filter forming substrate is subjected to a forced impurity extraction process in a state where the protective layer is in contact with the liquid crystal and a voltage is applied, the voltage applied to the liquid crystal is maintained. The rate is 80% or more.
Here, the state in which the protective layer is in contact with the liquid crystal means the state of the liquid crystal cell.

  A display member according to the present invention includes the color filter forming substrate according to any one of claims 6 to 7.

(Function)
The manufacturing method of the color filter forming substrate of the present invention has such a structure, and the method for manufacturing a color filter by an ink jet method uses a plastic film substrate as a base material for a display panel for color display. The color filter forming substrate manufacturing method for producing a color filter forming substrate can maintain both the voltage holding performance of the liquid crystal of the color filter forming substrate and the low temperature process by the ink jet method, and can also be run. It is possible to provide a manufacturing method of a color filter forming substrate that can reduce costs.
In particular, when used when producing a display panel for a liquid crystal display, the soft film substrate is not warped, the voltage holding ratio and durability of the liquid crystal are not lowered, and the running cost is suppressed. It is possible to provide a method for manufacturing a color filter forming substrate.
Specifically, in order, the partition layer forming step of forming a light-shielding partition wall on one surface of the substrate, and the colored layer is formed by an inkjet method in the recesses partitioned by the partition wall formed by the partition wall forming step. An inkjet ink for forming is disposed, and a colored layer forming step for heating and forming a colored layer to be a color filter by heating the inkjet ink and a protective film forming step for forming a protective film are performed. In the colored layer forming step, a solvent component having a boiling point of 180 ° C. to 260 ° C. and a vapor pressure of 0.5 mmHg or less at normal temperature is contained as a main solvent in a proportion of 80% by weight or more based on the total amount of the solvent. Ink jet ink is used, at a temperature lower than the boiling point of the main solvent of the ink jet ink disposed in the recess, and at the heat resistant temperature of the substrate. By and performs heating formation of the colored layer, we have achieved this.
Specifically, the colored layer forming step includes an ink jet containing a solvent component having a boiling point of 180 ° C. to 260 ° C. and a vapor pressure of 0.5 mmHg or less as a main solvent at a ratio of 80% by weight or more based on the total amount of the solvent. By using the ink for the ink jet, the solvent does not dry quickly at the tip of the nozzle of the ejection head that ejects the ink for ink jet. It is assumed that the property can be secured, and the solvent can be sufficiently removed in the heating formation.
In addition, the colored layer is formed by heating at a temperature lower than the boiling point of the main solvent of the ink-jet ink disposed in the recess and at the heat-resistant temperature of the base material. It is possible to form a colored layer with good positional accuracy by suppressing the dimensional change of the material to a practical level.
With a low boiling point solvent of less than 180 ° C., clogging due to drying of the solvent tends to occur at the tip of the nozzle of the discharge head. When a high boiling point solvent is used, clogging due to drying can be prevented, and ink jet ink is discharged. It is possible to prevent flying bends due to drying of the discharge head, to ensure good linearity during discharge, and to reduce the use efficiency of ink and the number of cleaning of the discharge head, thereby improving the cleaning efficiency.
Further, when the boiling point exceeds 260 ° C. as the main solvent, when the colored layer is heated and formed at a temperature lower than the boiling point of the main solvent and at the heat resistant temperature of the base material, removal of the solvent component is not possible in the heating formation. This is likely to be sufficient, and this increases the possibility of maintaining the voltage holding ratio and adhesion performance.
As the heat forming temperature, the range of 100 ° C. to 180 ° C. is set based on the curability of the ink for ink jet, the removability of the solvent of the ink, the heat resistance temperature of the plastic substrate, and the productivity at a practical level. It is preferable that the colored layer is thermally formed in the range of time to 3 hours.

Solvents having a boiling point of 180 ° C. to 260 ° C. and a vapor pressure at room temperature of 0.5 mmHg or less include ethylene glycol monobutyl ether acetate, diethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol diethyl ether, Examples include diethylene glycol dibutyl ether, diethyl adipate, dibutyl oxalate, dimethyl malonate, diethyl malonate, dimethyl succinate, and diethyl succinate. These solvents have a hydroxyl group in the molecule. This is also preferable.
Among the main solvents described above, an inkjet ink resin composition containing diethylene glycol monobutyl ether acetate as the main solvent does not dry quickly at the nozzle tip of the discharge head, but has an appropriate drying property.
Therefore, after being discharged onto the substrate, the substrate can be sufficiently leveled by being familiar with the substrate surface, and then can be completely dried in a relatively short time by natural drying or a general heating method.
Therefore, diethylene glycol monobutyl ether acetate can be exemplified as a preferable example in that a highly uniform pattern can be obtained and the pattern can be efficiently dried.
In addition, since the ink for a color filter according to the present invention contains a pigment, the main solvent that occupies most of the solvent is one that does not contain a hydroxyl group from the viewpoint of dispersibility and dispersion stability of the pigment. It is preferable.
These solvents can be mixed with or without mixing with highly dispersible solvents conventionally used in the preparation of pigment dispersions such as 3-methoxybutyl acetate and propylene glycol monomethyl ether acetate (PGMEA). It is possible to prepare a pigment dispersion.

Further, by using a plastic film substrate having a heat-resisting dimensional change rate at the heat forming temperature in the range of -0.05% to + 0.05%, the plastic film substrate is used as a basis. Even if a color filter is formed as a material, the dimensional change due to the effect of heating formation can be within a practical level.
Thereby, the positional accuracy of the alignment in the bonding or the like when manufacturing the display device can be performed at a practical level.

Further, the heating in the protective film forming step is performed at a temperature equal to or lower than the heating temperature of the colored layer. By adopting the form of claim 5, the dimensional change due to the heating in the protective film forming step can be within a practical level. .
As a result, it is possible to eliminate the adverse effect on the positional accuracy of the alignment in the bonding or the like when manufacturing the display device to a practical level.

With such a configuration, the color filter forming substrate of the present invention uses a plastic film substrate having flexibility as a base material, a color filter comprising a colored layer in order from the substrate side on one side of the base material, and a protective layer Is a color filter forming substrate in which a plastic film substrate substrate is used as a base material, and the quality maintenance of the color filter forming substrate and the production in a low-temperature process by an ink jet method can be compatible. Furthermore, the running cost can be suppressed in the production.
In the color filter forming substrate of the present invention, when the color filter forming substrate is subjected to a forced extraction process with the protective layer being in contact with the liquid crystal and a voltage is applied, the voltage applied to the liquid crystal is maintained. The voltage holding ratio of the liquid crystal, which is the ratio, can be 80% or more.
The impurity forced extraction process here is simply performed by making the colored layer in the color filter forming substrate of the present invention, the colored layer corresponding to the protective film, and the protective film in contact with the liquid crystal on the protective film side, and A liquid crystal cell for measurement having a structure in which the ITO electrode side is arranged between two glass substrates with an ITO electrode arranged so as to face each other and sealed together with a liquid crystal is manufactured, and the entire liquid crystal cell is placed in an oven. Heat treatment is performed at 105 ° C. for 2.5 hours.
Here, the voltage holding ratio of the liquid crystal is measured at room temperature under the following conditions for the liquid crystal cell for measurement subjected to the above heat treatment.
・ Distance between electrodes: 5 to 15 μm
・ Applied voltage pulse amplitude: 5V
・ Applied voltage pulse frequency: 60Hz
-Applied voltage pulse width: 16.67 msec
For measurement of the voltage holding ratio, a commercially available apparatus such as VHR-1A type / 1S type (Toyo Technica) can be used.
Further, in the color filter forming substrate formed by the method of the present invention, the adhesiveness between the plastic substrate having flexibility and the color filter formed of the colored layer is defined by JIS K5600-5-6 (1999). It can be classified as 0 or 1 in the eye tape peel test.

  With such a configuration, the display member of the present invention can use a color filter forming substrate having high productivity and low manufacturing cost while maintaining the quality of the color filter forming substrate.

The present invention, as described above, is a method for producing a color filter forming substrate for producing a color filter forming substrate for a display device by using a plastic film substrate as a base material by an ink jet method. It has become possible to provide a method for manufacturing a color filter-formed substrate that can maintain both the voltage holding performance of the liquid crystal of the substrate and the production by a low-temperature process, and can reduce the running cost.
At the same time, it is possible to provide a color filter forming substrate manufactured by such a method for manufacturing a color filter forming substrate and a display member such as a display panel using the color filter forming substrate.

Embodiments of the present invention will be described with reference to the drawings.
1 (a) to 1 (f) are process cross-sectional views showing an example of the process steps of the method for producing a color filter forming substrate of the present invention, and FIG. 2 (a) is a diagram of the color filter forming substrate of the present invention. FIG. 2B is a sectional view showing a first example of the embodiment, FIG. 2B is a sectional view showing a second example of the embodiment of the color filter forming substrate of the present invention, and FIG. FIG. 3A is a sectional view showing a third example of the embodiment of the color filter forming substrate of the present invention, and FIG. 3A is a schematic sectional view of an example of a display panel using the color filter forming substrate of the present invention. FIG. 3B is a schematic cross-sectional view of another example of a display panel using the color filter forming substrate of the present invention.
1 to 3, 1 is a plastic film substrate (also referred to as a base material), 2 is a black matrix layer, 3 is a partition wall, 4 is an ink droplet (inkjet ink), 4A is an ejection head, and 5a is a first coloring. 5b is a second colored layer, 5c is a third colored layer, 6 is a protective film, 7 is an electrode (also called a transparent electrode), 8 is a columnar spacer, 8A is a spherical spacer (also called a bead), and 9 is Alignment film 10 is a color filter forming substrate of the first example, 11 is a color filter forming substrate of the second example, 12 is a color filter forming substrate of the third example, 16 is a liquid crystal, 17 is a plastic film substrate (base) 20 and 21 are display panels.

An example of the method for producing a color filter forming substrate of the present invention will be described.
The manufacturing method of the color filter forming substrate of this example is a color filter comprising a plastic film substrate 1 having flexibility and a first colored layer 5a to a third colored layer 5c on one side of the substrate. In the manufacturing method of a color filter forming substrate for producing a color filter forming substrate 10 provided with a barrier rib, a partition forming step for forming a light-blocking partition 3 on at least one surface of the base material 1, and a partition forming step Ink portions for forming the colored layers 5a to 5c are arranged in the concave portions partitioned by the formed partition walls by an ink jet method, and the colored layers 5a to 5 become color filters by heating the ink for ink jets. A colored layer forming step of heating and forming 5c and a protective film forming step of forming a protective film are performed.
In particular, the colored layer forming step of this example contains, as a main solvent, a solvent component having a boiling point of 180 ° C. to 260 ° C. and a vapor pressure of 0.5 mmHg or less at room temperature in a proportion of 80% by weight or more based on the total amount of the solvent. The colored layer is heated and formed at a temperature lower than the boiling point of the main solvent of the ink-jet ink disposed in the recess and at the heat-resistant temperature of the base material.
In this way, the color filter-formed substrate manufacturing method of this example is a color filter display panel for color display using a plastic film substrate as a base material by an inkjet color filter manufacturing method. In the method for producing a color filter forming substrate for producing a filter forming substrate, it is possible to achieve both maintenance of the liquid crystal voltage holding performance of the color filter forming substrate and production in a low temperature process by an ink jet method, and further reduce the running cost. It can be suppressed.
In this example, the black matrix and the partition walls are different from each other, but both may be used together.

First, the manufacturing method of the color filter formation board | substrate of this example is demonstrated based on FIG. Here, the content of the process, the material of each member used, etc. are mainly demonstrated.
First, a plastic film substrate 1 is prepared as a base material. (Fig. 1 (a))
As the plastic film substrate 1 as a base material, one having a heat-resisting dimensional change rate in the range of -0.05% to + 0.05% at a heating formation temperature, which is a temperature at which a colored layer is formed by heating, is used.
As the plastic film substrate 1 as a base material, for example, a heat resistant resin base material having a high glass transition temperature as described in Japanese Patent Application No. 2007-0959797 (filed on Mar. 30, 2007) filed by the present applicant. A base material provided with a protective layer made of an inorganic compound film or the like that suppresses dimensional change is used on both sides.
The heat-resistant resin is not particularly limited as long as the glass transition temperature is 150 ° C. or higher, and has an arbitrary glass transition temperature depending on the process conditions when producing a color filter composed of a colored layer. A heat resistant resin can be used.
Especially, it is preferable that the glass transition temperature of heat-resistant resin is 180 degreeC or more, and it is especially preferable that it is 210 degreeC or more.
Thus, by selecting the glass transition temperature of the heat resistant resin, when manufacturing a color filter forming substrate provided with a color filter composed of a colored layer by an ink jet method using the plastic film substrate 1, the manufacturing of the color filter forming substrate is performed. The dimensional change in this process becomes a practical level, and desired dimensional stability can be achieved.
Examples of the heat resistant resin include polyimide resins, polyether sulfone resins, polyarylate resins, polycarbonate resins, cellulose derivatives such as triacetyl cellulose, cycloolefin resins, and the like.
Any of these heat-resistant materials can be suitably used, but among them, it is preferable to use a cycloolefin resin.
Since the cycloolefin resin has poor water absorption, the flexible substrate used for the display panel can be made less susceptible to dimensional changes due to water absorption.
Moreover, since the base material used can be provided with optical isotropy by using a cycloolefin resin, when used in the production of a liquid crystal display panel, the viewing angle characteristics of the liquid crystal display panel It becomes easy to design display quality such as.
The cycloolefin resin here means a resin having a monomer unit composed of a cyclic olefin (cycloolefin).
Examples of such a monomer comprising a cyclic olefin include norbornene and polycyclic norbornene monomers.
As the cycloolefin resin, any of a cycloolefin polymer (COP) or a cycloolefin copolymer (COC) can be suitably used. In addition, the cycloolefin resin used here may be a homopolymer of a monomer composed of the above cyclic olefin, or a copolymer.
The cycloolefin resin used here preferably has a saturated water absorption at 23 ° C. of 0.5% by mass or less, more preferably 0.4% by mass or less, and 0.3% by mass or less. Is more preferred.
By using such a cycloolefin-based resin, the base material used can be made less dimensional change due to water absorption, so the color filter forming substrate of this example can be made more excellent in dimensional stability. It is.
In addition, the said saturated water absorption is calculated | required by immersing in 23 degreeC water for 1 week based on ASTMD570, and measuring an increase weight.

Next, a black matrix layer 2 made of a colored layer is disposed on one side of the plastic film substrate 1. (Fig. 1 (b))
In order to improve the contrast of the display image, the black matrix layer 2 is provided so as to surround the pixels where the coloring layer is disposed and the outside of the pixel formation region.
Here, the black matrix layer 2 is disposed by printing a black colored layer, drying, and heating. However, the black matrix layer 2 is formed of a metal thin film such as chromium by sputtering, vacuum deposition, or the like. It may be formed.
Examples of the black colored layer include a resin layer in which light shielding particles such as carbon fine particles, metal oxides, inorganic pigments, and organic pigments are contained in a resin binder.
The thickness of the black matrix layer is about 1000 to 2000 mm in the case of a metal thin film, and about 0.5 to 2.5 μm in the case of a resin layer containing light shielding particles.

Next, an ink-repellent partition wall 3 for storing inkjet ink is formed on the black matrix. (Fig. 1 (c))
The partition wall 3 is formed with a width smaller than that of the black matrix layer 2 in the center in the width direction of the pattern of the black matrix layer 2.
The composition of the ink repellent partition wall 3 is not particularly limited as long as it is a resin composition having ink repellent properties.
Moreover, it does not need to be transparent in particular and may be colored.
For example, a material that is used for the black matrix layer 2 and does not include a black material can be used.
Specifically, a composition in which one or more aqueous resins such as polyacrylamide, polyvinyl alcohol, gelatin, casein, and cellulose are mixed, or an O / W emulsion type resin composition, for example, an emulsion of reactive silicon And the like. For reasons such as easy handling and curing, a photocurable resin is preferably used.
In addition, since the ink-repellent partition wall 3 is more preferable as the ink repellency is stronger, the surface thereof may be treated with an ink-repellent treatment agent such as a silicon compound or a fluorine-containing compound.
The patterning of the ink repellent partition wall 3 can be performed by printing using a coating liquid of an ink repellent resin composition or photolithography using a photocurable coating liquid.
As described above, the height of the ink repellent partition wall is preferably provided to prevent the ink from being mixed when coloring by the ink jet method as described above. Considering the overall flatness of the pixel, the thickness is preferably close to the thickness of the pixel.
Specifically, although it varies depending on the amount of ink deposited, it is usually preferably in the range of 0.1 to 2.0 μm.

After the partition walls are formed, the ink droplets 4 are ejected from the ejection head 4A, and ink jet ink is accumulated between the partition walls by an inkjet method. (Fig. 1 (d))
The inkjet ink for forming a color filter usually contains a pigment, a binder, a solvent, a pigment dispersant, a leveling agent, an additive, and the like. For example, an acrylic surfactant described in JP-A-2007-72283. And / or those containing 0.0001 to 1% by weight of a fluorosurfactant based on the total solid content.

Thereafter, pre-baking is performed, and post-baking is further performed, and a color filter including the colored layers 5a to 5c is formed by heating. (Fig. 1 (e))
The heat forming temperature is usually in the range of 100 ° C. to 180 ° C. from the curability of the ink for ink jet, the removability of the solvent of the ink, the heat resistance temperature of the plastic film substrate, and the productivity at a practical level. As described above, the colored layer is thermally formed in the range of 1 hour to 3 hours.
The colored layers 5a to 5c are usually formed of three colors of red (R), green (G), and blue (B).
The coloring pattern shape in the pixel can be a known arrangement such as a stripe type, a mosaic type, a triangle type, or a four-pixel arrangement type.
The thickness of the colored layer in the pixel is usually about 0.5 to 2.5 μm.
By changing the thickness of the colored layer in each color pixel, a desired thickness is set for each color.
It is preferable that the maximum value of the thickness of the colored layer in the pixel, particularly the maximum value of the thickness of the colored layer at the end of the pixel is 3.5 μm or less, and more preferably 3 μm or less.
It is preferable that the difference between the maximum value of the thickness of the colored layer in the pixel, particularly the maximum value of the thickness of the colored layer at the end of the pixel, and the average thickness is 1 μm or less, and further 0.7 μm or less.
In such a case, there is no problem in that the pixel in the thick film portion becomes dark or the ITO film formation failure due to the crack occurs to cause disconnection or the like, so that the display failure is reduced.
Furthermore, there is no problem that the gap of the liquid crystal layer cannot be accurately obtained.
Note that the thickness of the colored layer refers to the height from the reference surface (surface having an average height) of the substrate.
The average film thickness of the colored layer in the pixel is calculated by dividing the coating film volume in the pixel by the pixel area.
Furthermore, the maximum value of the film thickness of the colored layer at the edge of the pixel means the value of the film thickness at the highest film thickness among the end raised portions.

Next, a protective film is provided on the entire surface so as to cover the entire color filter composed of the colored layer. (Fig. 1 (f))
The protective film 6 is provided to flatten the surface of the color filter composed of the colored layers 5a to 5c and to prevent the components contained in the colored layer from eluting into the liquid crystal layer.
The protective film 6 is made of a known negative-type photocurable transparent resin composition or thermosetting transparent resin composition by a method such as spin coater, roll coater, spraying, printing, or the like. It can be formed by being disposed so as to cover 5c and being cured by light or heat.
The thickness of the protective film 6 can be set in consideration of the light transmittance of the material used, the surface state of the color filter, and the like, and can be set, for example, in the range of 0.1 to 2.0 μm. After the protective film is disposed, heat treatment is performed. Here, the heat treatment is performed at a temperature equal to or lower than the heating temperature of the colored layer. In this way, the color filter forming substrate 10 of the first example shown in FIG.

Next, the ink-jet ink for forming a color filter used here will be described.
Ink-jet inks for forming color filters usually contain pigments, binders, solvents, pigment dispersants, leveling agents, additives, etc., and the following materials are used for each member.
1. Pigment As the colorant, any pigment can be selected and used from organic colorants and inorganic colorants according to the desired colors such as R, G, and B of the pixel (pixel portion).
As the organic colorant, for example, dyes, organic pigments, natural pigments, and the like can be used.
Moreover, as an inorganic coloring agent, an inorganic pigment, an extender pigment, etc. can be used, for example.
Among these, organic pigments are preferably used because they have high color developability and high heat resistance.
Examples of organic pigments include compounds classified as Pigments in the Color Index (C.I .; published by The Society of Dyers Color is ts), specifically the following colors. Listed with index (C.I.) numbers.
C.I. Pigment Yellow 1, C.I. Pigment Yellow 3, C.I. Pigment Yellow 12, C.I. Pigment Yellow 13, C.I. Pigment Yellow 14, C.I. Pigment Yellow 15, C.I. Pigment Yellow 16, C.I. Pigment Yellow 17, C.I. Pigment Yellow 20, C.I. Pigment Yellow 24, C.I. Pigment Yellow 31, C.I. Pigment Yellow 55, C.I. Pigment Yellow 60, C.I. Pigment Yellow 61, C.I. Pigment Yellow 65, C.I. Pigment Yellow 71, C.I. Pigment Yellow 73, C.I. Pigment Yellow 74, C.I. Pigment Yellow 81, C.I. Pigment Yellow 83, C.I. Pigment Yellow 93, C.I. Pigment Yellow 95, C.I. Pigment Yellow 9 7, C.I. Pigment Yellow 98, C.I. Pigment Yellow 100, C.I. Pigment Yellow 101, C.I. Pigment Yellow 104, C.I. Pigment Yellow 106, C.I. Pigment Yellow 108, CI Pigment Yellow 109, C.I. Pigment Yellow 110, C.I. Pigment Yellow 113, C.I. Pigment Yellow 114, C.I. Pigment Yellow 116, C.I. Pigment Yellow 117, C.I. Pigment Yellow 119, C.I. Pigment Yellow 120, C.I. Pigment Yellow 126, C.I. Pigment Yellow 127, C.I. Pigment Yellow 128, C.I. Pigment Yellow 129, C.I. Pigment Yellow 138, C.I. Pigment Yellow 139, C.I. Pigment Yellow 150, C.I. Pigment Yellow 151, C.I. Pigment Yellow 152, C.I. Pigment Yellow 153, C.I. Pigment Yellow 154, C.I. Pigment Yellow 155, C.I. Pigment Yellow 156, C.I. Pigment Yellow 166, C.I. Pigment Yellow 168, C.I. Pigment Yellow 175;
C.I. Pigment Orange 1, C.I. Pigment Orange 5, C.I. Pigment Orange 13, C.I. Pigment Orange 14, C.I. Pigment Orange 16, C.I. Pigment Orange 17, C.I. Pigment Orange 24, C.I. Pigment Orange 34, C.I. Pigment Orange 36, C.I. Pigment Orange 38, C.I. Pigment Orange 40, C.I. Pigment Orange 43, C.I. Pigment Orange 46, C.I. Pigment Orange 49, C.I. Pigment Orange 51, C.I. Pigment Orange 61, C.I. Pigment Orange 63, C.I. Pigment Orange 64, C.I. Pigment Orange 71, C.I. Pigment Orange 73; C.I. Pigment Violet 1, C.I. Pigment Violet 19, C.I. Pigment By Pigment Violet 29, C.I. Pigment Violet 32, C.I. Pigment Violet 36, C.I. Pigment Violet 38;
CI Pigment Red 1, C.I. Pigment Red 2, C.I. Pigment Red 3, C.I. Pigment Red 4, C.I. Pigment Red 5, C.I. Pigment Red 6, C.I. Pigment Red 7, C.I. Pigment Red 8, C.I. Pigment Red 9, C.I. Pigment Red 10, C.I. Pigment Red 11, C.I. Pigment Red 12, C.I. Pigment Red 14, C.I. Pigment Red 15, C.I. Pigment Red 16, C.I. Pigment Red 17, C.I. Pigment Red 18, C.I. Pigment Red 19, C.I. 21, C.I. Pigment Red 22, C.I. Pigment Red 23, C.I. Pigment Red 30, C.I. Pigment Red 31, C.I. Pigment Red 32, C.I. Pigment Red 37, C Pigment Red 38, C.I. Pigment Red 40, C.I. Pigment Red 41, C.I. Pigment Red 42, C.I. Pigment Red 48: 1, C.I. Pigment Red 48: 2. C.I. Pigment Red 48: 3, C.I. Pigment Red 48: 4, C.I. Pigment Red 49: 1, C.I. Pigment Red 49: 2, C.I. Pigment Red 50: 1 C.I. Pigment Red 52: 1, C.I. Pigment Red 53: 1, C.I. Pigment Red 57, C.I. Pigment Red 57: 1, C.I. Pigment Red 57: 2, C. Pigment Red 58: 2, C.I. Pigment Red 58: 4, C.I. Pigment Red 60: 1, C.I. Pigment Red 63: 1, C.I. Pigment Red 63: 2, C. I. Pigment Red 64: 1 CI Pigment Red 81: 1, C.I. Pigment Red 83, C.I. Pigment Red 88, C.I. Pigment Red 90: 1, C.I. Pigment Red 97, C.I. Pigment Red 101, C.I. Pigment Red 102, C.I. Pigment Red 104, C.I. Pigment Red 105, C.I. Pigment Red 106, C.I. Pigment Red 108, C.I. Pigment Red 112, CI Pigment Red 113, C.I. Pigment Red 114, C.I. Pigment Red 122, C.I. Pigment Red 123, C.I. Pigment Red 144, C.I. Pigment Red 146, C.I. Pigment Red 149, C.I. Pigment Red 150, C.I. Pigment Red 151, C.I. Pigment Red 166, C.I. Pigment Red 68, C.I. Pigment Red 170, C.I. Pigment Red 171, C.I. Pigment Red 172, C.I. Pigment Red 174, C.I. Pigment Red 175, C.I. Pigment Red 176, CI Pigment Red 177, C.I. Pigment Red 178, C.I. Pigment Red 179, C.I. Pigment Red 180, C.I. Pigment Red 185, C.I. Pigment Red 187, C.I. Pigment Red 188, C.I. Pigment Red 190, C.I. Pigment Red 193, C.I. Pigment Red 194, C.I. Pigment Red 202, C.I. Pigment Red 206, C.I. Pigment Red 207, C.I. Pigment Red 208, C.I. Pigment Red 209, C.I. Pigment Red 215, C.I. Pigment Red 216, C.I. Pigment Red 220, C.I. Pigment Red 224, C.I. Pigment Red 226, C.I. Pigment Red 242, C.I. Pigment Red 243, C.I. Pigment Red 245 C.I. Pigment Red 254, C.I. Pigment Red 255, C.I. Pigment Red 264, C.I. Pigment Red 265;
CI Pigment Blue 15, C.I. Pigment Blue 15: 3, C.I. Pigment Blue 15: 4, C.I. Pigment Blue 15: 6, C.I. Pigment Blue 60; C.I. Pigment Green 7, C.I. Pigment Green 36; C.I. Pigment Brown 23, C.I. Pigment Brown 25; C.I. Pigment Black 1, Pigment Black 7.
Specific examples of the inorganic pigment or extender pigment include titanium oxide, barium sulfate, calcium carbonate, zinc white, lead sulfate, yellow lead, zinc yellow, red rose (red iron oxide (III)), cadmium red, ultramarine blue, Examples include bitumen, chromium oxide green, cobalt green, amber, titanium black, synthetic iron black, and carbon black. In this invention, a pigment can be used individually or in mixture of 2 or more types.
In the case of forming pixels, the pigment is usually blended at a ratio of 1 to 60% by weight, preferably 15 to 40% by weight, based on the total solid content of the inkjet ink. When there are too few pigments, there exists a possibility that the permeation | transmission density | concentration at the time of apply | coating an inkjet ink to predetermined | prescribed film thickness (usually 0.1-2.0 micrometers) may not be enough. Moreover, when there are too many pigments, the characteristics as a coating film such as adhesion to the substrate when the ink-jet ink is applied and cured on the substrate, surface roughness of the cured film, and coating film hardness may be insufficient. There is.

2. Binder Ink jet ink contains a binder in order to impart film formability and adhesion to the surface to be coated.
As the binder, a non-curable thermoplastic resin composition may be used, but it is preferable to use a binder containing a curable resin because it imparts sufficient hardness to the cured film.
Examples of the curable binder include a thermosetting binder including a thermosetting resin that can be polymerized and cured by heating, and light including a photocurable resin that can be polymerized and cured by visible light, ultraviolet light, an electron beam, and the like. A curable binder, and further, one containing both a thermosetting binder and a photocurable binder can be used.
Here, the colored layer is formed by heating and includes a thermosetting binder.
As the thermosetting binder, a combination of a compound having two or more thermosetting functional groups in one molecule and a curing agent is usually used, and a catalyst capable of promoting a thermosetting reaction may be added.
In order to improve the hardness and heat resistance of the cured layer, a catalyst capable of accelerating the thermosetting reaction between the acid and the epoxy may be added. As such a catalyst, a thermal latent catalyst that exhibits activity during heat curing is used. Can be used.
The heat-latent catalyst exhibits catalytic activity when heated, accelerates the curing reaction and gives good properties to the cured product, and is added as necessary.
The thermal latent catalyst is preferably one that exhibits acid catalytic activity at a temperature of 60 ° C. or higher. As such, a compound obtained by neutralizing a protonic acid with a Lewis base, a compound obtained by neutralizing a Lewis acid with a Lewis base, Lewis Examples thereof include a mixture of an acid and a trialkyl phosphate, sulfonic acid esters, onium compounds and the like, and various compounds described in JP-A-4-218561 can be used.
The thermal latent catalyst is usually blended at a ratio of about 0.01 to 10.0 parts by weight with respect to a total of 100 parts by weight of the compound having two or more thermosetting functional groups in one molecule and the curing agent. .
Usually, a curing agent is blended in combination.
As the curing agent, for example, a polyvalent carboxylic acid anhydride or a polyvalent carboxylic acid is used.
The curing agent can be used singly or in combination of two or more.
The amount of the curing agent is usually in the range of 1 to 100 parts by weight, preferably 5 to 50 parts by weight, per 100 parts by weight of the epoxy group-containing component (binder epoxy compound and polyfunctional epoxy compound). .

An epoxy group is preferably used as the thermosetting functional group.
Moreover, you may use further the polymer which has no polymerization reactivity in itself.
As a compound having two or more thermosetting functional groups in one molecule, an epoxy compound having two or more epoxy groups in one molecule is usually used.
An epoxy compound having two or more epoxy groups in one molecule is an epoxy compound having two or more, preferably 2 to 50, more preferably 2 to 20 epoxy groups in one molecule (referred to as an epoxy resin). Is included).
The epoxy group should just be a structure which has an oxirane ring structure, for example, can show a glycidyl group, an oxyethylene group, an epoxycyclohexyl group, etc.
Examples of the epoxy compound include known polyvalent epoxy compounds that can be cured by carboxylic acid. Examples of such an epoxy compound include “Epoxy resin handbook” edited by Masaki Shinbo, published by Nikkan Kogyo Shimbun (Showa 62). These can be used widely.
As an epoxy compound, in order to impart solvent resistance and heat resistance to the cured film, to increase the crosslink density of the polymer with a relatively high molecular weight and the cured film, or to improve the inkjet ejection performance by lowering the viscosity In addition, it is preferable to use a compound having a relatively low molecular weight in combination.

3. Solvent Here, as described above, as a main solvent, a solvent component having a boiling point of 180 ° C. to 260 ° C. and a vapor pressure at room temperature of 0.5 mmHg or less is a ratio of 80% by weight or more based on the total amount of the solvent. Ink-jet ink contained in
Solvents having a boiling point of 180 ° C. to 260 ° C. and a vapor pressure at room temperature of 0.5 mmHg or less include ethylene glycol monobutyl ether acetate, diethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol diethyl ether, Examples include diethylene glycol dibutyl ether, diethyl adipate, dibutyl oxalate, dimethyl malonate, diethyl malonate, dimethyl succinate, and diethyl succinate. These solvents have a hydroxyl group in the molecule. This is also preferable.
Among the main solvents described above, the inkjet ink resin composition using diethylene glycol monobutyl ether acetate as the main solvent does not dry quickly at the nozzle tip of the discharge head, but has an appropriate drying property.
Therefore, after being ejected onto the substrate, it can be sufficiently leveled by being familiar with the surface of the substrate and then completely dried in a relatively short time by natural drying or a general heating method.
Therefore, diethylene glycol monobutyl ether acetate can be exemplified as a preferable example in that a highly uniform pattern can be obtained and the pattern can be efficiently dried.
Since the inkjet ink for forming a color filter contains a pigment, it is preferable to use a solvent that does not contain a hydroxyl group from the viewpoint of the dispersibility and dispersion stability of the pigment, particularly as the main solvent occupying most of the solvent. .
These solvents can be mixed with or without mixing with highly dispersible solvents conventionally used for preparing pigment dispersions such as 3-methoxybutyl acetate and propylene glycol monomethyl ether acetate (PGMEA). It is possible to prepare a pigment dispersion.

4). Pigment dispersant The pigment dispersant is blended in the inkjet ink as needed in order to disperse the pigment satisfactorily. As the pigment dispersant, for example, cationic, anionic, nonionic, amphoteric surfactants and the like can be used. Among the surfactants, polymer surfactants (polymer dispersants) as exemplified below are preferable.
That is, polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, and polyoxyethylene oleyl ether; polyoxyethylene alkyl phenyl ethers such as polyoxyethylene octyl phenyl ether and polyoxyethylene nonyl phenyl ether Polymeric surfactants such as polyethylene glycol diesters such as polyethylene glycol dilaurate and polyethylene glycol distearate; sorbitan fatty acid esters; fatty acid-modified polyesters; tertiary amine-modified polyurethanes are preferably used.
The content of the pigment dispersant is preferably 10 to 50% by weight with respect to the whole solid content, and more preferably 15 to 40% by weight with respect to the whole solid content.

5. Other Leveling Agents Acrylic surfactants and / or fluorosurfactants also have an action as a leveling agent, but other leveling agents may be added as long as the effect is not impaired.
Examples of other leveling agents include polyoxyalkylene surfactants and fatty acid ester surfactants.

6). Other Components Furthermore, the ink for ink for color filters can mix | blend 1 type (s) or 2 or more types of other additives as needed.
The following can be illustrated as such an additive.
a) Filler: For example, glass, alumina and the like.
b) Adhesion promoter: for example, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane.
c) Ultraviolet absorber: For example, 2- (3-t-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole, alkoxybenzophenone and the like.
d) Anti-aggregation agent: for example, sodium polyacrylate.

Moreover, the manufacturing method of the ink for inkjet for color filter formation is performed as follows.
The inkjet ink for forming a color filter may be produced by adding each component into a single solvent or a solvent that is a mixed solvent and mixing them, and dissolving or dispersing the solid components.
However, if the pigment is directly put into the entire solvent together with other components such as a binder and mixed with stirring, the pigment is often not sufficiently dispersed in the solvent.
Therefore, usually, a solvent having good dispersibility and dispersion stability of the pigment is prepared, and the pigment is added thereto together with a dispersant, and sufficiently stirred by a dissolver or the like to prepare a pigment dispersion.
Then, the obtained pigment dispersion, together with components other than the pigment, is put into a solvent that is almost composed of the main solvent or only the main solvent, and is sufficiently stirred and mixed by a dissolver or the like, can do.
As the remaining solvent into which the pigment dispersion is charged, a solvent having a composition obtained by subtracting the solvent used for preparing the pigment dispersion from the total composition of the final solvent is diluted to the final concentration and used for inkjet. The ink may be completed.
Alternatively, a high-concentration inkjet ink may be prepared by introducing the pigment dispersion into a relatively small amount of the main solvent. A high-concentration ink-jet ink can be stored as it is and diluted to a final concentration just before use and used in an ink-jet method.

Next, a second example of the embodiment of the color filter forming substrate of the present invention will be described.
A color filter forming substrate 11 of the second example shown in FIG. 2B is a transparent electrode (transparent electrode) on the entire protective layer 6 of the color filter forming substrate 10 of the first example shown in FIG. 7 is obtained.
The transparent electrode 7 can be formed using, for example, indium tin oxide (ITO), zinc oxide (ZnO), tin oxide (SnO), or an alloy thereof.
The thickness of the transparent electrode can be about 20 to 500 nm, preferably about 100 to 300 nm.

Next, a third example of the embodiment of the color filter forming substrate of the present invention will be described.
The color filter forming substrate 12 of the third example shown in FIG. 2C is made of a transparent resin on the electrode (transparent electrode) 7 of the color filter forming substrate 11 of the second example shown in FIG. A columnar spacer 8 is formed, and an alignment film 9 is further formed on the columnar spacer 8.
A plurality of columnar spacers 8 are provided in a non-display area on the substrate in order to maintain a cell gap when the color filter 103 is bonded to a liquid crystal driving side substrate such as a TFT array substrate. The shape and dimensions of the columnar spacer 8 are not particularly limited as long as the columnar spacer 8 can be selectively provided in a non-display region on the substrate and can maintain a predetermined cell gap over the entire substrate. The columnar spacer 8 has a constant height in the range of about 2 to 10 μm, and the protruding height (pattern thickness) can be appropriately set from the thickness required for the liquid crystal layer.
Moreover, the thickness of the columnar spacer 8 can be appropriately set within a range of about 5 to 20 μm. Further, the formation density (density) of the columnar spacers 8 can be appropriately set in consideration of the thickness unevenness of the liquid crystal layer, the aperture ratio, the shape and material of the columnar spacers, for example, red, green and blue Necessary and sufficient spacer function is expressed at a ratio of one for each pixel.
Such a columnar spacer 8 may have any columnar shape, and may be, for example, a columnar shape, a prismatic shape, or a truncated cone shape.
The columnar spacer 8 is, for example, applied by applying a coating solution of a curable resin composition directly on a transparent substrate by various methods such as spin coating, roll coating, spraying, and printing, or through another layer such as a transparent electrode. And dried to form a curable resin layer.
The rotation speed of the spin coat may be set within a range of 500 to 1500 rotations / minute, for example, as in the case of forming the protective film.
The alignment film 9 can be formed, for example, by subjecting a film formed from an appropriate liquid crystal aligning agent to a rubbing treatment or the like. When used in a liquid crystal display panel, the alignment film 9 functions to align liquid crystal molecules in a certain direction. It is what has.

As the display member of the present invention, for example, the liquid crystal display panel 20 having the cross-sectional structure shown in FIG. 3A using the color filter forming substrate 11 of the second example, and the color filter formation of the third example are used. A liquid crystal display panel 21 having a cross-sectional structure shown in FIG. Here, a plastic film substrate 17 is used as a base material facing the color filter forming substrates 11 and 12, and the entire display panel has a flexible structure.
The plastic film substrate 17 preferably has a heat resistance change rate with respect to the processing temperature in the range of -0.05% to + 0.05%.
Thereby, the positional accuracy of the alignment in the bonding in the production of the display panel can be performed at a practical level.
The materials of the other parts of the color filter forming substrates 11 and 12 of the second example and the third example will be described by explaining the manufacturing method of the color filter forming substrate 10 of the first example shown in FIG. The description is omitted here.

The said embodiment is an illustration and this invention is not limited to the said embodiment.
Any device that has substantially the same structure as the technical idea described in the claims of the present invention and that exhibits the same effect can be included in the technical scope of the present invention. .
The application of the color filter forming substrate of the present invention is not limited to the liquid crystal display panel.
Further, the display member of the present invention is not limited to a flat display panel.
For example, in the case of the same cross-sectional structure as that shown in FIGS. 3A and 3B using the plastic film substrates 1 and 17, a flexible characteristic is used to provide a curved surface as a display member. Also good.
Further, the liquid crystal display panel in which the color filter forming substrate of the present invention is used is not particularly limited, and is an IPS (In-Plane Switching) type, STN (Super Twisted Nematic) type, TN (T It can be applied to (wisted Nematic) type, ferroelectric type, antiferroelectric type, MVA mode type and the like.
In addition, in the liquid crystal display panel shown in FIGS. 3A and 3B, a structure using a glass substrate in place of the plastic film substrate 17 is also exemplified as the display panel of the present invention.

(Example 1)
The present invention is not limited to the following embodiment.
Using the cycloolefin-based resin film PN400A (manufactured by JSR) having a thickness of 100 μm and a glass transition temperature of 400 ° C. as the base material, the color filter forming substrate of the present invention was prepared as follows (1) to (6). Then, the voltage holding ratio was measured as follows (7).

(1) Composition of inkjet ink and production method in Example 1 (1-1) Preparation of red pigment dispersion A pigment, a pigment dispersant, and a solvent are mixed in the following ratio to obtain zirconia beads having a diameter of 0.3 mm. 500 parts by weight, dispersed for 4 hours using a paint shaker (manufactured by Asada Tekko Co., Ltd.), PR254 (CI Pigment Red 254) pigment dispersion, PR177 (CI Pigment Red 177) pigment dispersion, and PY150 (CI Pigment Yellow 150) pigment dispersions were respectively prepared.

[Composition of pigment dispersion]
Pigment: 10 parts by weight Pigment dispersant (Ajisper Pb821 (manufactured by Ajinomoto Fine Techno Co., Ltd.) (solid content in organic solvent 30% by weight)): 15 parts by weight BCA (diethylene glycol monobutyl ether acetate): 70 parts by weight

(1-2) Synthesis of Binder Epoxy Compound In a four-necked flask equipped with a thermometer, a reflux condenser, a stirrer, and a dropping funnel, a solvent diethylene glycol monobutyl ether acetate (also known as a hydroxyl group) is used according to the blending ratio shown in Table 1. 40.7 parts by weight of butyl carbitol acetate (hereinafter, sometimes referred to as BCA) was charged and heated with stirring to 140 ° C.
Next, 54.7 parts by weight of a monomer having a composition described in Table 1 and a polymerization initiator mixture (dropping component) at a temperature of 140 ° C. was dropped at a constant rate from a dropping funnel over 2 hours. After completion of the dropwise addition, the temperature was lowered to 110 ° C., 4.6 parts by weight of a mixture of polymerization initiator and solvent-free diethylene glycol monobutyl ether acetate (BCA) (additional catalyst component) was added, and the temperature at 110 ° C. was maintained for 2 hours. By the way, by terminating the reaction, a binder epoxy compound having the characteristics shown in Table 1 was obtained.

* 1 in Table 1 (abbreviation of dripping component) is as follows.
GMA: Glycidyl methacrylate MMA: Methyl methacrylate Perbutyl O: t-Butylperoxy 2-ethylhexanoate (trade name, manufactured by NOF Corporation)
Moreover, * 2 (weight average molecular weight) in Table 1 is explained as follows.
Weight average molecular weight: A value in terms of polystyrene by gel permeation chromatography.

(1-3) Preparation of Binder A Teflon (registered trademark) -covered rotor was placed in a sample bottle and placed on a magnetic stirrer. In this sample bottle, add a binder-type epoxy compound, polyfunctional epoxy resin, etc. according to the following ratio, stir and dissolve thoroughly at room temperature, then add a diluting solvent to adjust the viscosity, stir and dissolve, Was filtered to obtain a binder composition.

[Binder composition]
-Binder epoxy compound synthesized (solid content 30% by weight in solvent BCA): 10 parts by weight-Multifunctional epoxy resin (trade name Epicoat 154, manufactured by Japan Epoxy Resin): 2 parts by weight-Neopentyl glycol glycidyl ether: 1 part by weight-trimellitic acid: 2 parts by weight-BCA (diethylene glycol monobutyl ether acetate): 10 parts by weight

(1-4) Preparation of Ink The above-prepared PR254 pigment dispersion, PR177 pigment dispersion, PY150 pigment dispersion, binder composition, and leveling at the blending ratio shown in Table 2 (expressed in terms of solid content) The agent was thoroughly mixed to prepare a red ink.

(2) Preparation of blue pigment dispersion and preparation of ink PG36 pigment dispersion and PY150 pigment dispersion were prepared in advance.
Next, the PG36 pigment dispersion prepared above, the PY150 pigment dispersion, the binder composition, and the leveling agent were sufficiently mixed at the blending ratio shown in Table 2 (expressed in terms of solid content), and the blue ink was mixed. Prepared.

(3) Preparation of green pigment dispersion and ink preparation PB15: 6 pigment dispersion and PV23 pigment dispersion were prepared in advance.
Next, the PB15: 6 pigment dispersion, the PV23 pigment dispersion, the binder composition, and the leveling agent prepared above were mixed thoroughly at the blending ratio shown in Table 2 (expressed in terms of solid content), and green. An ink was prepared.

(4) Formation of partition wall The above-mentioned film base material is fixed on a glass substrate (Corning 7059) having a thickness of 0.7 mm and 100 mm × 100 mm, and a black resist containing carbon black on the substrate (manufactured by Nippon Steel Chemical Co., Ltd., “ V-259BK resist ”) was added with 0.2 wt% of a fluorine-based surfactant product name“ MEGAFAC ”F-475 (manufactured by Dainippon Ink & Chemicals, Inc.) as a liquid repellent. This was applied onto the UV cleaned substrate with a spinner at 1100 rpm for 3 seconds, and then prebaked at 80 ° C. for 1 minute.
Next, after exposing to 20 mJ / cm 2 with an ultrahigh pressure mercury lamp using a predetermined pattern mask, development was performed with a KOH aqueous solution to remove the black resist in the unexposed areas.
Subsequently, a heat forming process was performed at 140 ° C. for 60 minutes to obtain a layer having a thickness of 2.3 μm.
The light shielding part which has liquid repellency was formed on the film substrate by the said operation.
At this time, the liquid repellency of the light shielding portion was 105 ° in terms of the contact angle of water.

(5) Formation of Pixels The ink was adhered to the pixel formation portion partitioned by the black matrix of the substrate by an inkjet method.
Then, it dried under reduced pressure at 23 degreeC to 0.15 Torr, and also pre-baked for 10 minutes on an 80 degreeC hotplate.
Thereafter, a heat forming process at 140 ° C. for 60 minutes was performed in a clean oven to form a pixel pattern having a colored layer with a thickness of 1.0 μm, which is adjacently arranged in a predetermined arrangement on the substrate.

(6) Formation of protective film A resist for protective film ("IT-MP408" manufactured by The Inktec Co., Ltd.) was applied on the color filter forming substrate with a spin coater at a rotation speed of 700 rpm for 10 seconds, and then hot The plate was pre-baked at 70 ° C. for 3 minutes.
Next, after 80 mJ / cm ² exposure with an ultra high pressure mercury lamp, a heat forming treatment was performed at 140 ° C. for 60 minutes to form a protective film having a thickness of 1.0 μm.

(7) Measurement of voltage holding ratio The glass substrate was appropriately washed, and then an ITO electrode was formed on the glass substrate and washed according to a conventional method to produce a glass substrate with an ITO electrode.
Next, each of the ink-jet ink materials was formed on the glass substrate with the ITO electrode by a spin coater so that the film thickness after post-baking was 1.0 μm, and a protective film material was further formed according to the above procedure.
And the glass substrate in which the said colored layer and the protective layer were formed, and the glass substrate in which the ITO electrode was formed were made to oppose, and the cell for a measurement was produced.
The distance between the opposing substrates was set so that the distance between the ITO electrodes was in the range of 5 to 15 μm, and the gap between the two substrates was sealed with a sealing member. Next, liquid crystal (“DP-5002LA” manufactured by Chisso Corporation) is injected into the space formed between the two substrates and the sealing member, and the injection port is sealed to produce a cell for measuring voltage holding ratio. did.
Subsequently, the cell into which the liquid crystal was injected was subjected to a heat treatment at 105 ° C. for 2.5 hours, the measurement cell subjected to the impurity forced extraction treatment was returned to room temperature, and a voltage was applied under the following conditions to maintain the voltage retention rate. It was measured.
・ Distance between electrodes: 5 to 15 μm
・ Applied voltage pulse amplitude: 5V
・ Applied voltage pulse frequency: 60Hz
-Applied voltage pulse width: 16.67 msec
For the measurement of the voltage holding ratio, a commercially available apparatus such as VHR-1A type / 1S type (Toyo Technica) can be used.

As shown in Table 3, the voltage holding ratio when heated and formed at 140 ° C. for 60 minutes using the glass substrate with ITO electrode is 90.97% (red), 91.26% (green), 91.59. % (Blue).
In addition, (red), (green), and (blue) mean the formation region of the red coloring layer, the green coloring layer, and the blue coloring layer, respectively. It is expressed as + protective film voltage holding ratio, green + protective film voltage holding ratio, and blue + protective film voltage holding ratio.

  As shown in Table 3, the dimensional change rate when heated at 140 ° C. for 60 minutes using the film substrate was −0.041%.

(Comparative Example 1)
As Comparative Example 1, PGMEA (polypropylene glycol monomethyl ether acetate) boiling point of 146 ° C. was used as the main solvent, and the ink was prepared in the same manner as in the above example except that it was applied to the partition wall produced under the same conditions as in the above example by inkjet. However, during the application, the solvent rapidly dried at the tip of the inkjet head nozzle, resulting in clogging, gradually lowering the discharge stability, and finally it became impossible to apply.

(Comparative Example 2)
As Comparative Example 2, the same ink material and substrate as in the above example were used, and the heat-resistant dimensional change rate and the voltage holding rate when the heat forming temperature was 200 ° C. for 1 hour were -16.75%, respectively. 93.13% (red), 92.03% (green), 93.20% (blue).

FIG. 1A to FIG. 1F are process cross-sectional views illustrating an example of the process of the method for manufacturing a color filter forming substrate of the present invention. FIG. 2A is a sectional view showing a first example of the embodiment of the color filter forming substrate of the present invention, and FIG. 2B is a second view of the embodiment of the color filter forming substrate of the present invention. FIG. 2C is a sectional view showing a third example of the embodiment of the color filter forming substrate of the present invention. FIG. 3A is a schematic sectional view of an example of a display panel using the color filter forming substrate of the present invention, and FIG. 3B is another view of the display panel using the color filter forming substrate of the present invention. It is a schematic sectional drawing of an example.

Explanation of symbols

1 Plastic film substrate (also called base material)
2 Black matrix layer 3 Partition 4 Ink droplet (inkjet ink)
4A Discharge head 5a First colored layer 5b Second colored layer 5c Third colored layer 6 Protective film 7 Electrode (also referred to as transparent electrode)
8 Columnar spacer 8A Spherical spacer (also called beads)
9 Alignment Film 10 Color Filter Forming Substrate 11 of the First Example 11 Color Filter Forming Substrate 12 of the Second Example Color Filter Forming Substrate 16 of the Third Example 16 Liquid Crystal 17 Plastic Film Substrate (also called Base Material)
20, 21 Display panel

Claims (8)

  A color filter forming substrate for producing a color filter forming substrate in which a plastic film substrate having flexibility is used as a base material, and a color filter composed of a colored layer in order from the base material side and a protective layer are arranged on one side of the base material. In the manufacturing method, a partition forming step for forming a light-shielding partition wall on one surface of the base material in order, and a concave portion delimited by the partition wall formed by the partition forming step are colored by the inkjet method. Disposing an ink jet ink for forming a layer and heating the ink jet ink to form a colored layer to be a color filter by heating, and a protective film forming step to form a protective film, In the colored layer forming step, the boiling point is 180 ° C. to 260 ° C. and the vapor pressure at room temperature is 0.5 mm as a main solvent. g or less is used at a temperature lower than the boiling point of the main solvent of the ink-jet ink disposed in the recess; A method for producing a color filter forming substrate, wherein the colored layer is formed by heating at the heat resistant temperature of the substrate.   It is a manufacturing method of the color filter formation board | substrate of Claim 1, Comprising: The heating formation temperature which is the temperature at the time of heat-forming the said colored layer is the range of 100 to 180 degreeC, and heating formation time is 1 hour-3 A method for manufacturing a color filter forming substrate, characterized in that time is used.   3. The method for producing a color filter forming substrate according to claim 1, wherein a main solvent of the ink-jet ink is diethylene glycol mono-n-butyl ether acetate. Manufacturing method.   The method for producing a color filter forming substrate according to any one of claims 1 to 3, wherein the base material has a heat-resistant dimensional change rate at the heating forming temperature of -0.05% to + 0.05%. A method for producing a color filter forming substrate, characterized by using a plastic film substrate in the range   5. The color filter forming substrate manufacturing method according to claim 1, wherein the heating in the protective film forming step is performed at a temperature equal to or lower than a heating temperature of the colored layer. A manufacturing method of a forming substrate.   A color filter forming substrate in which a plastic film substrate having flexibility is used as a base material, and a color filter composed of a colored layer and a protective film are disposed on one surface side of the base material sequentially from the substrate side. Or manufactured by the method for producing a color filter forming substrate according to any one of 5 to 5, wherein the colored layer is formed by heating in a concave portion partitioned by a light-shielding partition. Characteristic color filter forming substrate. 7. The color filter forming substrate according to claim 6, wherein the color filter forming substrate is subjected to a forced extraction process in a state where a protective layer is in contact with the liquid crystal, and a voltage is applied to the liquid crystal when a voltage is applied. A color filter-formed substrate, wherein the retention rate of is 80% or more.   A display member comprising the color filter forming substrate according to claim 6.

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