JP2010181715A - Color filter for liquid crystal display device of semi-transmissive and half-reflective type - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color filter having excellent characteristics in enlarging the viewing angle in an oblique direction at low cost and high productivity. <P>SOLUTION: The color filter for a liquid crystal display device of a semi-transmissive and half-reflective type includes a colored layer for transmitted light of a plurality of colors formed on a transparent substrate, a colored layer for reflected light of a plurality of colors, and an overcoat layer formed so as to cover the colored layers. The overcoat layer has retardation of the thickness direction, and the thickness of the overcoat layer is made to vary depend on the retardation of the colored layer for transmitted light or the colored layer for reflected light so that the retardation of the thickness direction possessed by the stacking part of the colored layer for transmitted light and the overcoat layer becomes uniform, and so that the retardation of the thickness direction possessed by the stacking part of the colored layer for reflected light and the overcoat layer becomes uniform. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a color filter for a transflective liquid crystal display device used in a transflective liquid crystal display device, a manufacturing method thereof, a design method thereof, and a color for the transflective liquid crystal display device. The present invention relates to a transflective liquid crystal display device using a filter.

  The liquid crystal display device has features such as power saving, light weight, thinness, and the like, and has rapidly spread in recent years in place of the conventional CRT display. As a general liquid crystal display device, as shown in FIG. 19, a liquid crystal display device having an incident side polarizing plate 102 </ b> A, an outgoing side polarizing plate 102 </ b> B, and a liquid crystal cell 101 can be exemplified. The polarizing plates 102A and 102B are configured to selectively transmit only linearly polarized light having a vibration surface in a predetermined vibration direction, and crossed Nicols so that the vibration directions are perpendicular to each other. It is arranged to face each other. The liquid crystal cell 101 includes a large number of cells corresponding to the pixels, and is disposed between the polarizing plates 102A and 102B.

  As such a liquid crystal display device, those using various driving methods are known depending on the arrangement form of the liquid crystal material used in the liquid crystal cell. The main liquid crystal display devices in widespread use today are the twisted nematic method (TN), the super twisted nematic method (STN), the multi-alignment division type vertical alignment method (MVA), the horizontal electrolytic drive method (IPS), and the OCB. (Optically Compensated Bend) etc. In particular, today, those having the MVA and IPS drive systems have come into widespread use.

  On the other hand, the liquid crystal display device has a problem of viewing angle dependency due to the refractive index anisotropy of the liquid crystal cell and the polarizing plate as a specific problem. This problem of viewing angle dependency is a problem that the color and contrast of an image that is visually recognized change when the liquid crystal display device is viewed from the front and when viewed from an oblique direction. Such a problem of viewing angle characteristics has become more serious as the liquid crystal display device has recently been enlarged.

  Various techniques have been developed so far to improve the viewing angle dependency problem. As a typical method, there is a method using a retardation film. In the method using this retardation film, for example, as shown in FIG. 20, a retardation film 103 having predetermined optical characteristics is disposed between the liquid crystal cell 101 and the polarizing plates 102A and 102B, thereby depending on the viewing angle. It is a way to improve sex problems. Since such a method can improve the viewing angle dependency problem only by incorporating the retardation film 103 in the liquid crystal display device, it can be easily obtained as a liquid crystal display device having excellent viewing angle characteristics. It has been widely used.

  However, since the color filter used in the liquid crystal display device has a different phase difference depending on the colored layer of each color, when the above-described retardation film is used, the difference in the phase difference of the colored layer of each color cannot be compensated. Therefore, it has been difficult to completely solve the problem of viewing angle dependency.

  Therefore, in order to solve the above problem, Patent Document 1 discloses a method of forming a retardation layer having an optimum retardation by using colored layers of respective colors of a color filter. However, in this method, there is a problem in that the steps are complicated and the cost increases because it is necessary to form a retardation layer on the colored layer of each color.

  On the other hand, in recent years, a transflective liquid crystal display device utilizing reflection of external light and transmitted light of backlight has been developed as a liquid crystal display device. The conventional reflection type color liquid crystal display device that performs display using the above has an advantage that it also has a backlight and can perform display (transmission display) using the backlight even when the surroundings are dark.

  However, in the color filter used in such a transflective liquid crystal display device, since the external light passes through the colored layer twice as incident light and reflected light, the reflected light region is displayed by the external light. In some cases, there is a problem in that the color characteristics of the light-transmitting light area and the transmitted light area where the display is performed by the backlight light are different.

  In order to solve such a problem, for example, a method of forming a thick colored layer in the transmitted light region and forming a thin colored layer in the reflected light region, etc. A method of forming a layer has been adopted. However, in this method, when forming a color filter having colored layers of three colors (red (R), green (G), and blue (B)), for example, a photolithography method or the like must be repeated six times. The process was complicated.

  In addition, the transflective liquid crystal display device also has the problem of viewing angle dependency as described above during black display. When this problem is compensated by a retardation film, the reflected light region is In addition, there is a problem that the difference in phase difference between the colored layers of the respective colors in the transmitted light region cannot be compensated.

  Therefore, when forming a retardation layer having an optimum retardation on each color layer of a color filter used in such a transflective liquid crystal display device, there is a problem that the process becomes further complicated. there were.

JP 2007-279448 A

  The present invention provides a color filter for a transflective liquid crystal display device (hereinafter simply referred to as a color filter for transflective liquid crystal display devices) having excellent characteristics for widening the viewing angle so as not to produce a black display with color even when observed from an oblique direction during black display. A color filter manufacturing method capable of providing such a color filter with low cost and high productivity, and designing the color filter to have excellent viewing angle characteristics. The main object is to provide a color filter design method and a transflective liquid crystal display device excellent in viewing angle characteristics.

  The present invention provides a transparent substrate, a colored layer for transmitted light of a plurality of colors formed in the transmitted light region on the transparent substrate, and a reflected light of a plurality of colors formed in the reflected light region on the transparent substrate. A color filter having a colored layer and an overcoat layer formed to cover the transparent substrate, the colored layer for transmitted light, and the colored layer for reflected light, wherein the overcoat layer has a thickness direction A layered portion of the colored layer for transmitted light of each color and the overcoat layer formed in the region for transmitted light (hereinafter referred to as a layered portion for transmitted light) and made of a material having retardation (hereinafter referred to as Rth) Rth of the colored layer for reflected light of each color and the overcoat layer laminated portion formed in the reflected light region (hereinafter referred to as a reflected light laminated portion). But The thickness of the overcoat layer varies depending on the Rth of the colored layer for transmitted light of each color and the colored layer for reflected light of each color so that the Rth is uniform. Provide a color filter.

  According to the present invention, the overcoat layer is formed with a different film thickness according to Rth of the colored layer for transmitted light of each color and the colored layer for reflected light of each color, so that the laminated portion for transmitted light of each color It is possible to make the Rths uniform, and to make the Rths of the laminated portions for reflected light of the respective colors uniform. Thereby, in the transflective liquid crystal display device using the color filter of the present invention, the display using the transmitted light region (hereinafter referred to as transmissive display) and the display using the reflected light region (hereinafter referred to as the transmissive display). In this case, when viewed from an oblique direction during black display, the color display is not black and the viewing angle characteristics are excellent. .

  In the said invention, it is preferable that the overcoat layer formed in the said area | region for reflected light has an optical path difference adjustment function. Since the overcoat layer has an optical path difference adjusting function, it is not necessary to separately form an optical path difference adjusting layer, and the manufacturing process can be simplified.

  Moreover, in the said invention, the optical path difference adjustment layer may be separately formed in the said area | region for reflected light on the said transparent substrate. This is because the optical path difference between the transmitted light and the reflected light can be adjusted more accurately by forming the optical path difference adjusting layer.

  In the said invention, the columnar spacer may be integrally formed on the said overcoat layer. This is because the number of steps during manufacturing can be reduced.

  The present invention also provides a transparent substrate, a plurality of colored layers for transmitted light formed in the transmitted light region on the transparent substrate, and a plurality of colored reflections formed in the reflected light region on the transparent substrate. A color filter having a colored layer for light, and an overcoat layer formed so as to cover the transparent substrate, the colored layer for transmitted light, and the colored layer for reflected light, wherein the overcoat layer is Rth When the color filter is used in a transflective liquid crystal display device, the color filter has Rth, and the transflective liquid crystal display device does not have the color filter. According to the Rth of the colored layer for transmitted light and the colored layer for reflected light of each color so that the Rth of the state (hereinafter referred to as a liquid crystal display device without a color filter) is offset, Providing a color filter, wherein the thickness of the serial overcoat layer are different.

  According to the present invention, since the Rth between the liquid crystal display device without a color filter and the color filter is canceled by having the overcoat layer, a transflective liquid crystal display device with a color filter is provided. Contrast can be improved.

  In the said invention, it is preferable that the overcoat layer formed in the said area | region for reflected light has an optical path difference adjustment function. Since the overcoat layer has an optical path difference adjusting function, it is not necessary to separately form an optical path difference adjusting layer, and the manufacturing process can be simplified.

  In the said invention, the optical path difference adjustment layer may be formed in the said reflected light area | region on the said transparent substrate separately. This is because the optical path difference between the transmitted light and the reflected light can be adjusted more accurately by forming the optical path difference adjusting layer.

  In the said invention, the columnar spacer may be integrally formed on the said overcoat layer. This is because the number of steps during manufacturing can be reduced.

  The present invention provides a colored layer forming step in which a colored layer for transmitted light of a plurality of colors is formed in a region for transmitted light on a transparent substrate, and a colored layer for reflected light of a plurality of colors is formed in the region for reflected light on the transparent substrate. And an overcoat layer forming coating solution for forming an overcoat layer formed so as to cover the transparent substrate, the transmitted light colored layer, and the reflected light colored layer, and a material having Rth. Applying the overcoat layer forming coating liquid preparation step prepared by using the overcoat layer forming coating liquid so as to cover the transparent substrate, the transmitted light colored layer, and the reflected light colored layer. A layer formation process for forming an overcoat layer and a layer for transmitting light of each color by developing the overcoat layer formation layer after exposure using a multi-tone mask and developing the layer. Rth that the part has And the overcoat layer according to the Rth of the colored layer for the transmitted light and the colored layer for the reflected light of each color so that the Rth of the laminated portion for reflected light of each color is uniform. There is provided an overcoat layer forming step of forming an overcoat layer in such a manner that the film thicknesses thereof are different from each other.

According to the present invention, the color filter manufactured by the above-described method for manufacturing a color filter has a uniform Rth in the layered portion for transmitted light of each color and a uniform Rth in the layered portion for reflected light of each color. It will be something. Thereby, in the transflective liquid crystal display device using the manufactured color filter, in both cases of black display during transmissive display and black display during reflective display, when observed from an oblique direction, Black display without color can be achieved.
Further, according to the present invention, overcoat layers having different film thicknesses are formed by batch exposure using a multi-tone mask according to Rth of the colored layer for transmitted light of each color and the colored layer for reflected light of each color. Therefore, the process is simple and the color filter can be manufactured at low cost compared to the case of forming the optimum retardation layer on the colored layer for reflected light of each color and the colored layer for transmitted light of each color. It becomes possible to form.

  The present invention provides a colored layer forming step in which a colored layer for transmitted light of a plurality of colors is formed in a region for transmitted light on a transparent substrate, and a colored layer for reflected light of a plurality of colors is formed in the region for reflected light on the transparent substrate. And an overcoat layer forming coating solution for forming an overcoat layer formed so as to cover the transparent substrate, the transmitted light colored layer, and the reflected light colored layer, and a material having Rth. Applying the overcoat layer forming coating liquid preparation step prepared by using the overcoat layer forming coating liquid so as to cover the transparent substrate, the transmitted light colored layer, and the reflected light colored layer. The overcoat layer forming layer forming step for forming the overcoat layer forming layer, and the overcoat layer forming layer is exposed to light using a multi-tone mask and then developed, so that the color filter becomes semi-transmissive Semi-reflective liquid crystal When used in the display device, the Rth of the color filter and the Rth of the liquid crystal display device not equipped with the color filter cancel each other, the colored layer for transmitted light of each color and the colored for reflected light of each color. There is provided an overcoat layer forming step of forming an overcoat layer in such a manner that the film thickness of the overcoat layer varies depending on Rth possessed by the layer.

According to the present invention, it is possible to obtain a color filter that can cancel Rth of the liquid crystal display device not equipped with the color filter by manufacturing the color filter by the method for manufacturing the color filter. Thereby, the contrast when a color filter is attached to form a transflective liquid crystal display device can be improved.
In addition, according to the present invention, overcoat layers having different film thicknesses are formed by batch exposure using a multi-tone mask according to the Rth of the colored layer for transmitted light of each color and the colored layer for reflected light of each color. Therefore, the process is simple and the color filter can be manufactured at low cost compared to the case of forming the optimum retardation layer on the colored layer for transmitted light of each color and the colored layer for reflected light of each color. It becomes possible to form.

  In the present invention, a colored layer for transmitting light for design of a plurality of colors is formed in a region for transmitted light on a transparent substrate for design, and a colored for reflected light for design of a plurality of colors is formed in the region for reflected light on the transparent substrate for design. After the layer is formed, a measuring step for measuring Rth of the colored layer for transmitted light for design and the colored layer for reflected light for design, and for the transmitted light for design of each color based on the result of the measured step The Rth of the laminate portion of the design overcoat layer formed in the colored layer and the transmitted light region is uniform, and is formed in the colored layer for reflected light and the reflected light region of each color The material having Rth used for forming the design overcoat layer is selected so that the Rth of the laminated portion of the design overcoat layer is uniform, and the colored layer for transmitted light of each color and each color of each color are selected. For the above design And providing an overcoat layer adjusting step for determining the film thickness of the design overcoat layer in accordance with Rth of the colored layer for irradiation. A method for designing a color filter for a transflective liquid crystal display device is provided. To do.

  According to the present invention, Rth is measured for the colored layer for transmitted light for design and the colored layer for reflected light for design of each color, and is formed in the colored layer for transmitted light for design and the transmitted light region. Rth of the laminated portion of the design overcoat layer is uniform, and the Rth of the laminated portion of the design overcoat layer formed in the reflected light colored layer and the reflected light region of each color is By selecting the material of the design overcoat layer so that it is uniform, determining the film thickness, and adjusting the overcoat layer, it is possible to design a color filter with excellent viewing angle characteristics when displaying black it can.

  In the present invention, a colored layer for transmitting light for design of a plurality of colors is formed in a region for transmitted light on a transparent substrate for design, and a colored for reflected light for design of a plurality of colors is formed in the region for reflected light on the transparent substrate for design. After forming the layer, the color filter is transflective and semi-reflective based on the measurement step of measuring Rth of the colored layer for transmitted light for design and the colored layer for reflected light for design, and the result of the measured step. Rth used for forming the design overcoat layer so that the Rth of the color filter and the Rth of the liquid crystal display device without the color filter are offset when used in a liquid crystal display device An overcoat layer adjusting step of selecting a material and determining the film thickness of the design overcoat layer according to Rth of the colored layer for transmitted light for design of each color and the colored layer for reflected light for design of each color; Yes It provides a designing method of a color filter according to claim Rukoto.

  According to the present invention, when the Rth is measured for the above-described colored layer for transmitting light for design and the colored layer for reflected light for each color, the color filter is used in a transflective liquid crystal display device. The Rth of the color transmission light for design and the color reflection layer for design reflection of each color so that the Rth of the color filter and the Rth of the liquid crystal display device without the color filter are offset. Accordingly, by selecting a material for the design overcoat layer and determining the film thickness, a color filter with high contrast can be designed.

  In the present invention, the above-described color filter manufacturing method may include a design process using the color filter design method. By having the above design process, Rth of the laminated portion for transmitted light of each color and the laminated portion for reflected light of each color can be accurately adjusted, so that a high-quality color filter can be manufactured.

  The present invention provides a transflective liquid crystal display device having at least the color filter described above.

  According to the present invention, the Rth between the color filter and the liquid crystal display device without the color filter is canceled out, so that the contrast can be improved.

In the present invention, it is possible to make the Rth possessed by the laminated portion for transmitted light of each color uniform by the overcoat layer, and make the Rth possessed by the laminated portion for reflected light of each color uniform. In the transflective liquid crystal display device using the color filter, black color appears to be colored black when the black display is observed from an oblique direction in both transmissive display and reflective display. Therefore, good black display can be performed.
In addition, since the overcoat layer can cancel the Rth of the liquid crystal display device without the color filter and the Rth of the color filter, in the transflective liquid crystal display device using the color filter of the present invention, The contrast can be further improved.
Further, since the overcoat layer used in the present invention can be formed with different film thicknesses by a batch process using a multi-tone mask, viewing angle compensation can be performed easily and at low cost.

It is a schematic sectional drawing which shows an example of the color filter of this invention. It is a figure which shows an example of distribution of Rth of the color filter of this invention. It is a schematic sectional drawing which shows another example of the color filter of this invention. It is a schematic sectional drawing which shows another example of the color filter of this invention. It is a figure which shows another example of distribution of Rth of the color filter of this invention. It is a figure which shows another example of distribution of Rth of the color filter of this invention. It is a schematic sectional drawing which shows another example of the color filter of this invention. It is a schematic sectional drawing which shows another example of the color filter of this invention. It is a schematic sectional drawing which shows another example of the color filter of this invention. It is a schematic sectional drawing which shows another example of the color filter of this invention. It is a schematic sectional drawing which shows another example of the color filter of this invention. It is a schematic sectional drawing which shows another example of the color filter of this invention. It is a schematic sectional drawing which shows another example of the color filter of this invention. It is a figure which shows another example of distribution of Rth of the color filter of this invention. It is a figure which shows another example of distribution of Rth of the color filter of this invention. It is a figure which shows another example of distribution of Rth of the color filter of this invention. It is a figure which shows another example of distribution of Rth of the color filter of this invention. It is process drawing which shows an example of the manufacturing method of the color filter of this invention. It is the schematic which shows an example of a common liquid crystal display device. It is the schematic which shows an example of the liquid crystal display device in which the phase difference film was used.

Hereinafter, the color filter, the color filter manufacturing method, the color filter design method, and the transflective liquid crystal display device of the present invention will be described.
A. Color filter The color filter of the present invention is characterized by having an overcoat layer having Rth.
Here, the Rth of the overcoat layer includes the refractive index Nx in the fast axis direction (direction in which the refractive index is the smallest) and the slow axis direction (direction in which the refractive index is the largest) in the plane of the overcoat layer. The refractive index Ny, the refractive index Nz in the thickness direction, and the thickness d (nm) of the overcoat layer are values represented by the formula Rth = {(Nx + Ny) / 2−Nz} × d.
The film thickness of the overcoat layer used in the present invention can be measured by a general film thickness measuring machine. As an example, there is a stylus type film thickness measuring device P.15 manufactured by KLA Tencor Co., Ltd.
Moreover, Rth of the overcoat layer used in the present invention is 620 nm (assuming a red colored layer), 550 nm (assuming a green colored layer), and a retardation layer measuring apparatus (Axoscan ^TM Mueller Matrix Polarimeter manufactured by AXOMETRICS), and The values measured for three wavelengths of 450 nm (assuming a blue colored layer) shall be used.

In the color filter of the present invention, the transmitted light of each color is set so that the Rth of the layered portion for transmitted light of each color is uniform and the Rth of the layered portion for reflected light of each color is uniform. And the color filter in the transflective liquid crystal display device, in which the thickness of the overcoat layer differs depending on Rth of the colored layer for reflection and the colored layer for reflected light of each color (hereinafter referred to as the first embodiment). When used, the Rth of the color filter for the transmitted light and the Rth of the color layer for the reflected light of each color are set so that the Rth of the color filter and the Rth of the liquid crystal display device without the color filter cancel each other. Accordingly, there is a mode in which the film thickness of the overcoat layer is different (hereinafter referred to as a second mode).
Hereinafter, each embodiment will be described.

1. First Embodiment A color filter according to this embodiment is formed in a transparent substrate, a colored layer for transmitted light of a plurality of colors formed in the transmitted light region on the transparent substrate, and a reflected light region on the transparent substrate. A color filter having a plurality of colored layers for reflected light, and an overcoat layer formed so as to cover the transparent substrate, the transmitted light colored layer, and the reflected light colored layer, The overcoat layer is made of a material having Rth, and the Rth of the layered portion for transmitted light of each color is uniform, and the Rth of the layered portion for reflected light of each color is uniform. The overcoat layer has a different thickness depending on Rth of the colored layer for light and the colored layer for reflected light of each color.

  Here, “the Rth of the layered portion for transmitted light of each color is uniform and the Rth of the layered portion for reflected light of each color is uniform” means that the Rth of the layered portion for transmitted light of each color is When the color filter of this embodiment is used in a transflective liquid crystal display device, when black display is performed by transmissive display, a colored black display is observed when observed from an oblique direction. Similarly, the Rths that are not observed and the reflection light laminated portions of the respective colors have a black color when observed in an oblique direction when black display is performed by reflection display. It means that the display is aligned to the extent that it is not observed. Specifically, the absolute value of the difference between the maximum value and the minimum value of Rth possessed by the laminate portion for transmitted light of each color, and the absolute value of the difference between the maximum value and the minimum value of Rth possessed by the laminate portion for reflected light of each color The value is 5 nm or less, preferably 3 nm or less, and particularly preferably 1 nm or less.

  In the present embodiment, the Rth included in each color transmission layer and the Rth included in each color reflection layer may be uniform. The Rth included in the transmission layer and the above The Rth included in the laminated portion for reflected light may be the same value or a different value.

Next, the color filter of this embodiment is demonstrated using figures.
FIG. 1 is a schematic cross-sectional view showing an example of the color filter of the present embodiment. As shown in FIG. 1, the color filter 10 of this embodiment includes a transparent substrate 1 and a plurality of colored layers 2 t for transmitted light formed in a transmitted light region t on the transparent substrate 1 (red in FIG. 1). The transmitted light colored layer 2t (R), the green transmitted light colored layer 2t (G), the blue transmitted light colored layer 2t (B)), and the reflected light formed in the reflected light region r on the transparent substrate 1. Colored layer 2r (in FIG. 1, colored layer 2r (R) for reflected red light, colored layer 2r (G) for reflected green light, colored layer 2r (B) for reflected blue light), transparent substrate 1, transmitted light And the overcoat layer 3 formed so as to cover the colored layer 2r for reflected light and the colored layer 2r for reflected light. Further, the overcoat layer 3 is made of a material having Rth, and the film thickness of the overcoat layer 3 is such that the Rth of the laminated portion for transmitted light of each color is uniform, and the Rth of the laminated portion for reflected light of each color is It is formed to be uniform. Therefore, the overcoat layer 3 has a different film thickness depending on the Rth of the colored layer 2t for transmitted light of each color and the colored layer 2r for reflected light of each color.
In addition, the color filter 10 of this embodiment has the light-shielding part 4 which partitions a pixel on the transparent substrate 1 normally.

Next, the relationship between the Rth of the colored layer and the Rth of the overcoat layer in this embodiment will be described.
FIG. 2 is a diagram illustrating an example of Rth distribution of the colored layer for transmitted light and the colored layer for reflected light of the color filter. FIG. 2 shows a case where three colors of red, green, and blue are used for the colored layer for transmitted light and the colored layer for reflected light. As shown in FIG. 2, the colored layer for red transmitted light R (t), the colored layer for green transmitted light G (t), and the colored layer for blue transmitted light B (t) have different Rths. Further, the colored layer for red reflected light R (r), the colored layer for green reflected light G (r), and the colored layer for blue reflected light B (r) also have different Rths. Normally, the retardation layer used in the liquid crystal display device does not compensate for the Rth of the above-described colored layer for transmitted light and colored layer for reflected light, so depending on the color filter, black display is observed from an oblique direction. In such a case, there is a problem that a colored black color is observed due to leakage of light having a specific wavelength.
On the other hand, in this embodiment, the Rth of the laminated portion for transmitted light of each color is uniform, with the overcoat layer having Rth on the colored layer for transmitted light of each color and the colored layer for reflected light of each color. In addition, they are formed with different film thicknesses so that the Rth of the laminated portions for reflected light of each color is uniform. By making Rth uniform, in the transflective liquid crystal display device using the color filter of this embodiment, black display was observed from an oblique direction in both transmissive display and reflective display. In this case, no leakage light is generated in the light of a specific wavelength, so that a black display with good color can be achieved and a good black display can be performed.
Hereinafter, each structure of the color filter of this embodiment is demonstrated.

a. Overcoat layer The overcoat layer used in this embodiment is formed so as to cover a transparent substrate, a colored layer for transmitted light, and a colored layer for reflected light, which will be described later. Rths of the transmitted light colored portions and the reflected light colored layers of the respective colors so that the Rth of the transmitted light laminated portions is uniform and the Rth of the reflected light laminated portions of each color is uniform. The film thickness of the overcoat layer differs depending on the case.

The overcoat layer used in this embodiment is made of a material having Rth. Such a material is not particularly limited as long as the Rth of the laminated portion for transmitted light is uniform and the Rth is sufficient to make the Rth of the laminated portion for reflected light uniform. is not.
Specifically, the Rth that the material of such an overcoat layer has is a range of 1 nm / μm to 30 nm / μm per 1 μm of the overcoat layer, particularly 2 nm / μm to Rth when Rth is a positive value. A range of 20 nm / μm, particularly 3 nm / μm to 10 nm / μm is preferable. Further, when Rth is a negative value, it is in the range of −1 nm / μm to −30 nm / μm per μm of the overcoat layer, in particular, in the range of −2 nm / μm to −20 nm / μm, in particular, −3 nm / μm. It is preferable to be within the range of -10 nm / μm. When the absolute value of Rth of the material of the overcoat layer is less than the above range, the film thickness of the overcoat layer formed on the colored layer for transmitted light of each color and the colored layer for reflected light of each color is increased. This is because if the above range is exceeded, the change in Rth per 1 μm of the overcoat layer becomes large, and it is difficult to accurately adjust Rth by the overcoat layer to be formed.

The material of the overcoat layer used in this embodiment is not particularly limited as long as it is transparent and has Rth, and may be a photocurable resin or a thermosetting resin. May be. In this embodiment, it is more preferable to use a photocurable resin. This is because by using the photo-curing resin, it becomes possible to form overcoat layers having different film thicknesses at once using a multi-tone mask.
As the material for such an overcoat layer, a binder resin component, a monomer component, a polymerization initiator (a photopolymerization initiator in the case of a photocurable resin, a thermal polymerization initiator in the case of a thermosetting resin), an additive, and the like Is mentioned.
A material used for a general overcoat layer has Rth, and the value of Rth varies depending on the constituent components of the material used.
In the overcoat layer material used in the present invention, each component is adjusted so as to have a desired Rth value.

Specifically, as the binder resin component used for the material of the overcoat layer, for example, ethylene-vinyl acetate copolymer, ethylene-vinyl chloride copolymer, ethylene vinyl copolymer, polystyrene, acrylonitrile-styrene copolymer Coalescence, ABS resin, polymethacrylic acid resin, ethylene methacrylic acid resin, polyvinyl chloride resin, chlorinated vinyl chloride, polyvinyl alcohol, cellulose acetate propionate, cellulose acetate butyrate, nylon 6, nylon 66, nylon 12, polyethylene terephthalate , Polybutylene terephthalate, Polycarbonate, Polyvinyl acetal, Polyether ether ketone, Polyether sulfone, Polyphenylene sulfide, Polyarylate, Polyvinyl butyral, Epoxy Si resin, phenoxy resin, polyimide resin, polyamideimide resin, polyamic acid resin, polyetherimide resin, phenol resin, urea resin, and polymerizable monomers such as methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, n -Propyl acrylate, n-propyl methacrylate, isopropyl acrylate, isopropyl methacrylate, sec-butyl acrylate, sec-butyl methacrylate, isobutyl acrylate, isobutyl methacrylate, tert-butyl acrylate, tert-butyl methacrylate, n-pentyl acrylate, n-pentyl methacrylate , N-hexyl acrylate, n-hexyl methacrylate, 2-ethylhexyl acrylate , 2-ethylhexyl methacrylate, n-octyl acrylate, n-octyl methacrylate, n-decyl acrylate, n-decyl methacrylate, styrene, α-methylstyrene, N-vinyl-2-pyrrolidone, glycidyl (meth) acrylate Acrylic acid, methacrylic acid, dimer of acrylic acid (for example, M-5600 manufactured by Toagosei Co., Ltd.), itaconic acid, crotonic acid, maleic acid, fumaric acid, vinyl acetic acid, acid anhydrides thereof, etc. Or a polymer or copolymer composed of one or more of the following. Moreover, although the polymer etc. which added the ethylenically unsaturated compound which has a glycidyl group or a hydroxyl group to said copolymer are mentioned, it is not limited to these.
Among the above binder resins, from the viewpoint of compatibility with the monomers used together, polymethyl methacrylate resin, polyethyl methacrylate resin, polymethyl methacrylate resin and polyethyl methacrylate resin copolymer, Phenoxy resin, epoxy resin, polycarbonate resin, polystyrene resin, cellulose acetate propionate, cellulose acetate butyrate, ethyl hydroxyethyl cellulose, cellulose triacetate and the like can be preferably used. Particularly preferably, polymethyl methacrylate resin, polyethyl methacrylate resin, polystyrene resin, copolymer of methacrylic acid and styrene, glycidyl methacrylate, phenoxy resin, epoxy resin, and modified products thereof can be used. .
In particular, as an epoxy resin preferable as the binder resin, the Epicoat series manufactured by Mitsubishi Yuka Shell Co., Ltd., the Celoxide series manufactured by Daicel Corporation, the Epolide series, or bisphenol-A type epoxy resin, bisphenol-F type epoxy Resin, bisphenol-S type epoxy resin, novolak type epoxy resin, polycarboxylic acid glycidyl ester, polyol glycidyl ester, aliphatic or cycloaliphatic epoxy resin, amine epoxy resin, triphenolmethane type epoxy resin, dihydroxybenzene type epoxy resin, Examples thereof include a copolymerized epoxy compound of glycidyl (meth) acrylate and a monomer capable of radical polymerization. The content of such a binder resin is 10% to 90% by weight, preferably 20% to 80% by weight of the nonvolatile component of the resin composition.

In addition, as the monomer component used in the overcoat layer, a compound having at least one polymerizable carbon-carbon unsaturated bond is used. Specifically, allyl acrylate, benzyl acrylate, butoxyethyl acrylate, butoxyethylene glycol acrylate, cyclohexyl acrylate, dicyclopentanyl acrylate, 2-ethylhexyl acrylate, glycerol acrylate, glycidyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl Acrylate, isobornyl acrylate, isodexyl acrylate, isooctyl acrylate, lauryl acrylate, 2-methoxyethyl acrylate, methoxyethylene glycol acrylate, phenoxyethyl acrylate, stearyl acrylate, ethylene glycol diacrylate, diethylene glycol diacrylate, 1,4-butane Diol diacrylate, , 5-pentanediol diacrylate, 1,6-hexanediol diacrylate, 1,3-propanediol acrylate, 1,4-cyclohexanediol diacrylate, 2,2-dimethylolpropane diacrylate, glycerol diacrylate, tripropylene Glycol diacrylate, glycerol triacrylate, trimethylolpropane triacrylate, polyoxyethylated trimethylolpropane triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, triethylene glycol diacrylate, polyoxypropyltrimethylolpropane triacrylate, butylene Glycol diacrylate, 1,2,4-butanetriol triacrylate, 2,2, -Trimethyl-1,3-pentanediol diacrylate, diallyl fumarate, 1,10-decanediol dimethyl acrylate, dipentaerythritol hexaacrylate, and those obtained by substituting the acrylate group with a methacrylate group, γ-methacryloxypropyl Trimethoxysilane, 1-vinyl-2-pyrrolidone, 2-hydroxyethylacryloyl phosphate, tetrahydrofurfuryl acrylate, dicyclopentenyl acrylate, dicyclopentenyloxyethyl acrylate, 3-butanediol diacrylate, neopentyl glycol diacrylate, Polyethylene glycol diacrylate, hydroxypivalate ester neopentyl glycol diacrylate, phenol-ethylene oxide modification Acrylate, phenol-propylene oxide modified acrylate, N-vinyl-2-pyrrolidone, bisphenol A-ethylene oxide modified diacrylate, pentaerythritol diacrylate monostearate, tetraethylene glycol diacrylate, polypropylene glycol diacrylate, trimethylolpropane propylene oxa Modified triacrylate, isocyanuric acid ethylene oxide modified triacrylate, trimethylolpropane ethylene oxide modified triacrylate, pentaerythritol pentaacrylate, pentaerythritol hexaacrylate, pentaerythritol tetraacrylate, and other acrylate monomers, and methacrylates of these acrylate groups Also substituted on the group , Urethane acrylate oligomer in which acrylate group is bonded to oligomer having polyurethane structure, polyester acrylate oligomer in which acrylate group is bonded to oligomer having polyester structure, epoxy acrylate oligomer in which acrylate group is bonded to oligomer having epoxy group, polyurethane Urethane methacrylate oligomer in which methacrylate group is bonded to oligomer having structure, polyester methacrylate oligomer in which methacrylate group is bonded to oligomer having polyester structure, epoxy methacrylate oligomer in which methacrylate group is bonded to oligomer having epoxy group, acrylate group Polyurethane acrylate having polyester acrylate having acrylate groups And epoxy acrylate resin having an acrylate group, polyurethane methacrylate having a methacrylate group, polyester methacrylate having a methacrylate group, epoxy methacrylate resin having a methacrylate group, and the like.
These are examples of monomers that can be used and are not limited to these. Further, the content of such a monomer is desirably in the range of 10% to 90% by weight, preferably 20% to 80% by weight of the nonvolatile component of the resin composition.

  Polymerization initiators used for the overcoat layer (photopolymerization initiator in the case of a photocurable resin, thermal polymerization initiator in the case of a thermosetting resin), additives, etc. used for general resin members Therefore, description thereof is omitted here.

  Further, when the absolute value of Rth of the material of the overcoat layer using the above-described material is smaller than a desired value, a polymerizable liquid crystal, an inorganic needle crystal, a planar structure group having one or more crosslinkable groups is formed. You may add the organic compound etc. which have.

The overcoat layer used in this embodiment is usually formed of a single layer, but a first overcoat layer having a large absolute value of Rth is formed, and a liquid crystal is formed on the first overcoat layer. On the other hand, it may be an overcoat layer having a laminated structure in which a second overcoat layer made of a transparent resin that is non-contaminant and has a small absolute value of Rth is formed. This is because some materials used for the first overcoat layer having a large absolute value of Rth have an adverse effect on the liquid crystal. By making this a laminated structure as described above, the range of selection of materials can be expanded.
Moreover, since the absolute value of Rth that the overcoat layer has can be increased by having the laminated structure, even if the absolute value of Rth that the colored layer of each color has is large, it is possible to cope with it. It becomes possible.

  As a method for forming such an overcoat layer, for each color of transmitted light, the Rth of the layered portion for transmitted light of each color is uniform and the Rth of the layered portion for reflected light of each color is uniform. There is no particular limitation as long as an overcoat layer having a different film thickness can be formed according to the Rth of the colored layer and the colored layer for reflected light of each color. For example, a photo using a multi-tone mask is used. Lithographic method may be used, and it may be formed by applying the overcoat layer forming coating solution a plurality of times depending on the thickness. In this embodiment, the multi-tone mask is used. It is preferably formed by a photolithography method using This is because by using a multi-tone mask, overcoat layers having different thicknesses can be formed on the colored layer for transmitted light of each color and the colored layer for reflected light of each color by batch exposure. Specifically, the method described in “B. Manufacturing method of color filter” described later can be used.

  Regarding the film thickness of the overcoat layer used in this embodiment, it is possible to make the Rth of the laminated portion for transmitted light uniform and make the Rth of the laminated portion for reflected light uniform. It is not particularly limited, and is appropriately determined depending on the Rth of the colored layer for transmitted light of each color and the colored layer for reflected light of each color on which the overcoat layer is formed.

In this embodiment, the overcoat layer formed on the colored layer for reflected light may have an optical path difference adjusting function.
Here, the “optical path difference adjusting function” is to adjust the optical path difference between transmitted light and reflected light when the color filter of this embodiment is used in a transflective liquid crystal display device.
In general, in a transflective liquid crystal display device, transmitted light passes through the liquid crystal layer once during transmissive display, whereas reflected light passes through the liquid crystal layer twice during reflective display. It is necessary to make the optical path of this half the optical path of the transmitted light.
In this embodiment, as illustrated in FIG. 3, the overcoat layer formed on the reflected light coloring layer has a film thickness that can make the optical path of the reflected light half the optical path of the transmitted light. 4 or as illustrated in FIG. 4, the thickness of the laminated portion for reflected light is larger than the thickness of the laminated portion for transmitted light, and the optical path of the reflected light is half the optical path of the transmitted light. Thus, an overcoat layer having an optical path difference adjusting function is formed so as to have a film thickness that can bear a part of the optical path difference adjustment.
The overcoat layer is used for adjusting the optical path difference so that the thickness of the laminated portion for reflected light is larger than the thickness of the laminated portion for transmitted light, and the optical path of the reflected light is half of the optical path of the transmitted light. 4 having a film thickness that can serve as a part, an optical path difference adjustment layer 5 is formed separately on the overcoat layer in the reflected light region to adjust the optical path difference as illustrated in FIG. Although not shown, the optical path difference may be adjusted by forming an optical path difference adjusting layer on the counter substrate side in the case of a transflective liquid crystal display device.
Here, reference numerals not described in FIG. 3 and FIG. 4 can be the same as those in FIG.

  Moreover, in this embodiment, the overcoat layer formed on the colored layer for reflected light of at least one color among the overcoat layers formed on the colored layer for reflected light of each color is adjusted for optical path difference. The overcoat layer formed on the colored layers for reflected light of all colors preferably has an optical path difference adjusting function.

Here, the Rth distribution of the color filter in the case where the overcoat layer formed on the colored layer for reflected light has an optical path difference adjusting function will be described with reference to the drawings. FIG. 5 is a diagram illustrating an example of Rth distribution of a color filter in which the overcoat layer formed on the colored layer for reflected light has an optical path difference adjusting function.
As shown in FIG. 5, when the Rths of the transmitted light colored layers and the reflected light colored layers of the respective colors used in the color filter of the present embodiment have the same sign, the Rth of the reflected light laminated portion Is made larger than the absolute value of Rth of the laminated portion for transmitted light, as shown in FIG. 3 and FIG. The thickness of the overcoat layer formed on the colored layer for transmitted light of each color can be made larger, and an optical path difference adjusting function can be imparted to the overcoat layer formed on the reflected light colored layer. it can. When the distribution of Rth of the color filter is as shown in FIG. 5, the overcoat layer formed on the colored layer for reflected light of each color of the color filter has an optical path difference adjusting function.

FIG. 6 is a diagram illustrating another example of the Rth distribution of the color filter in which the overcoat layer formed on the colored layer for reflected light has a function of adjusting the optical path difference. As shown in FIG. 6, when the Rth signs of the colored layers for transmitted light of each color and the colored layers for reflected light of each color used in the color filter are different (in FIG. 6, the colored layer for red transmitted light and the red reflected light Rth of the colored layer for negative is negative, Rth of the colored layer for green transmitted light and the colored layer for green reflected light is negative, and Rth of the colored layer for blue transmitted light and the colored layer for blue reflected light) is, for example, By making the absolute value of Rth of the laminated portion for reflected light larger than the absolute value of Rth of the laminated portion for transmitted light, for example, as shown in FIG. 7, the colored layer 2r (R) for red reflected light and the green reflected light An optical path difference adjusting function can be imparted to the overcoat layer 3 formed on the colored layer 2r (G) for use. With respect to the overcoat layer on the colored layer for reflected light having a different sign, the presence or absence of the optical path difference adjusting function is determined by setting Rth of the laminated portion for reflected light of each color.
Note that reference numerals that are not described with reference to FIG. 7 can be the same as those in FIG.

Here, as shown in the Rth distribution of the color filter in FIG. 6, when the Rth code of the colored layer for transmitted light and the colored layer for reflected light is different from the Rth code of the overcoat layer, the transmitted light The overcoat layer formed on the colored layer for reflected light and the colored layer for reflected light cancels out Rth of the colored layer for transmitted light and the colored layer for reflected light, and the laminated portion for reflected light of other colors and reflected It is formed by adjusting the film thickness so as to have an Rth that is uniform with the Rth of the laminated portion for light.
For example, when the colored layer of each color of the color filter of the present embodiment shows the Rth distribution as shown in FIG. 6, the overcoat layer formed on the blue transmitted light colored layer is the Rth of the blue transmitted light colored layer. In order to cancel out (20 nm) and to make it equal to Rth (−15 nm) of the laminated portion for transmitted light of other colors, the film thickness is adjusted so as to have Rth of −35 nm. Similarly, for the overcoat layer formed on the colored layer for reflected blue light, the Rth (10 nm) of the colored layer for reflected blue light is offset, and the Rth ( In order to make the thickness uniform (−25 nm), the film thickness is adjusted so as to have an Rth of −35 nm.

In this embodiment, the maximum film thickness of the overcoat layer to be formed is appropriately selected depending on the color filter used, but the overcoat layer formed on the colored layer for reflected light has an optical path difference adjusting function. Is preferably in the range of 1.0 μm to 15 μm, more preferably in the range of 2.0 μm to 10 μm, and particularly preferably in the range of 3.0 μm to 8 μm. This is because when the maximum film thickness of the overcoat layer is less than the above range, it becomes difficult to form an overcoat layer having a film thickness necessary for adjusting the optical path difference. This is because the thickness of the display device becomes too large.
The minimum film thickness of the overcoat layer is appropriately selected according to the color filter to be used, but it is in the range of 0.5 μm to 3.0 μm, particularly in the range of 0.8 μm to 2.5 μm. In particular, the thickness is preferably in the range of 1.0 μm to 2.0 μm. When it is less than the above range, it is difficult to form an overcoat layer so as to cover the transparent substrate, the colored layer for transmitted light, and the colored layer for reflected light. This is because the overcoat layer becomes too thick.

b. Colored layer for transmitted light and colored layer for reflected light The colored layer for transmitted light used in this embodiment is formed in a region for transmitted light on a transparent substrate. Moreover, the colored layer for reflected light used in this embodiment is formed in the region for reflected light on the transparent substrate. Here, in this embodiment, a pixel portion composed of a colored layer for transmitted light and a colored layer for reflected light is expressed as a colored layer. Usually, the color filter uses three colored layers of red, green, and blue.

  The colored layers are regularly arranged corresponding to the pixels. The arrangement of the colored layers is not particularly limited as long as the colored layers of the respective colors are arranged on an average when viewed macroscopically, and examples thereof include a stripe arrangement, a mosaic arrangement, and a delta arrangement.

The colored layer is obtained by dispersing or dissolving a colorant such as a pigment or dye of each color in a binder resin.
Examples of the colorant used in the red coloring layer 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 coloring layer include phthalocyanine pigments such as halogen polysubstituted phthalocyanine pigments or halogen polysubstituted copper phthalocyanine pigments, triphenylmethane basic dyes, isoindoline pigments, and isoindolinone pigments. Etc. These pigments or dyes may be used alone or in combination of two or more.
Examples of the colorant used in the blue colored layer 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.

Moreover, transparent resin is mentioned as binder resin used for a colored layer.
When a printing method is used as the method for forming the colored layer, examples of the binder resin include polymethyl methacrylate resin, polyacrylate resin, polycarbonate resin, polyvinyl alcohol resin, polyvinyl pyrrolidone resin, hydroxyethyl cellulose resin, carboxymethyl cellulose resin, and polyvinyl chloride. Examples thereof include resins, melamine resins, phenol resins, alkyd resins, epoxy resins, polyurethane resins, polyester resins, maleic acid resins, polyamide resins, and the like.
In addition, when a photolithography method is used as a method for forming a colored layer, the binder resin is usually an ionizing radiation curable resin having a reactive vinyl group such as an acrylate, methacrylate, polyvinyl cinnamate, or cyclized rubber. Is used. Usually, an electron beam curable resin or an ultraviolet curable resin is used.
When an ultraviolet curable resin is used, a photopolymerization initiator is used alone or in combination with a binder resin. When an ultraviolet curable resin is used, a sensitizer, a coatability improver, a development improver, a crosslinking agent, a polymerization inhibitor, a plasticizer, a flame retardant, and the like may be used as necessary.

  The colored layer for transmitted light and the colored layer for reflected light used in this embodiment are not particularly limited as long as the difference in color characteristics between transmissive display and reflective display is adjusted. Absent. For example, it is formed by adjusting the pigment concentration used for the colored layer for transmitted light and the colored layer for reflected light, for example, the colored layer for transmitted light and the colored layer for reflected light are formed with the same film thickness. Examples include those prepared by adjusting the colored layer for reflected light by providing a pinhole portion, and those obtained by adjusting the film thickness ratio between the colored layer for transmitted light and the colored layer for reflected light. As the colored layer for transmitted light and the colored layer for reflected light used in this embodiment, it is preferable that the film thickness ratio is adjusted between the colored layer for transmitted light and the colored layer for reflected light. The same material can be used for the colored layer for transmitted light and the colored layer for reflected light, and it is possible to form the colored layer for transmitted light and the colored layer for reflected light collectively using a multi-tone mask. Because. In addition, the overcoat layer described above makes it easier to adjust the Rth of the transmitted light layered portion and the reflected light layered portion than the one prepared by providing a pinhole portion in the colored layer for reflected light. Because it becomes.

  The film thickness ratio between the colored layer for transmitted light and the colored layer for reflected light (the thickness of the colored layer for reflected light / the thickness of the colored layer for transmitted light) is the same for transmissive display and reflective display. Is not particularly limited as long as the difference in color characteristics can be adjusted, but it is within the range of 0.2 to 0.8, particularly within the range of 0.3 to 0.7, particularly 0.4. It is preferable to be within the range of -0.6. When the film thickness ratio of the colored layer for transmitted light and the colored layer for reflected light is less than the above range or exceeds the above range, the difference in color characteristics between the transmissive display and the reflective display is recognized, and high quality This is because it is difficult to perform accurate display.

  In addition, the thickness of the colored layer is appropriately selected depending on the color filter to be used. Usually, the thickness of the colored layer for transmitted light is in the range of 1.0 μm to 8.0 μm. In addition, the thickness of the colored layer for reflected light is in the range of 0.5 μm to 3.0 μm.

Further, as the colored layer used in the present embodiment, for example, as shown in FIG. 8, the thickness of the colored layer 2t for transmitted light and the color of each color so that the overcoat layer 3 described above is formed flat. The film thickness of the colored layer 2r for reflected light may be varied.
For example, as shown in FIG. 8, in order to make the surface of the overcoat layer flat, the thickness of the colored layer is different depending on the colored layer for transmitted light and the colored layer for reflected light. It is necessary to adjust the formulation of the coating liquid for forming the colored layer. When changing the thickness of the colored layer, generally, when making it thicker than usual, the proportion of the coloring agent in the photosensitive resin composition to be used is reduced, and it is made thinner than usual. In some cases, adjustments such as increasing the blending ratio of the colorant are performed. Moreover, when the coating thickness varies depending on the viscosity of the photosensitive resin composition used, it is preferable to appropriately select the viscosity of the photosensitive resin composition.
As shown in FIG. 8, when the thickness of the colored layer for reflected light is made thicker than the colored layer for transmitted light, the colored layer for reflected light of each color is set so that the color density of the colored layer for reflected light is reduced. It is necessary to adjust the formulation of the forming coating solution.
Here, in FIG. 8, reference numerals that are not described can be the same as those in FIG. 1, and thus description thereof is omitted here.

  As a method for forming the colored layer, for example, a coloring agent is mixed, dispersed or solubilized in a binder resin to prepare a colored layer forming coating solution, and the colored layer forming coating solution is used for photolithography. A patterning method or a patterning method using an inkjet method using a colored layer forming coating solution is used.

  The Rth of the colored layer used in this embodiment varies depending on the color filter used, but the absolute value of the difference between the maximum and minimum values of Rth of the colored layer for transmitted light of each color, and each color The absolute value of the difference between the maximum value and the minimum value of Rth of the colored layer for reflected light is preferably 10 nm or less, more preferably 8 nm or less, and particularly preferably 5 nm or less. When the absolute value of the difference between the maximum value and the minimum value of Rth of the colored layer for transmitted light and the absolute value of the difference between the maximum value and the minimum value of Rth of the colored layer for reflected light exceed the above range, an overcoat layer This is because it is difficult to make the Rth of the colored layer of each color and the laminated portion of the overcoat layer uniform. The absolute value of the difference between the maximum and minimum values of Rth of the colored layer for transmitted light and the lower limit of the absolute value of the difference between the maximum and minimum values of Rth of the colored layer for reflected light are 1 nm or more. is there. If the value is smaller than the above value, it is not necessary to form an overcoat layer so that the Rth of the layered portion for transmitted light of each color and the layered portion for reflected light of each color is uniform.

c. Transparent Substrate The transparent substrate used in the present embodiment is not particularly limited as long as it can form a colored layer and, if necessary, a light-shielding portion and is transparent to visible light.
In the present embodiment, it is more preferable that the transparent substrate does not have Rth. Such a transparent substrate can be the same as the transparent substrate used for a general color filter.

  Specifically, non-flexible transparent rigid materials such as alkali-free glass, quartz glass, Pyrex (registered trademark) glass, and synthetic quartz plates, or flexibility such as transparent resin films and optical resin plates. The transparent flexible material etc. which have are mentioned.

d. Other members The color filter of the present embodiment is not particularly limited as long as it has at least the overcoat layer, the colored layer, and the transparent substrate. Also good. For example, an optical path difference adjusting layer, a columnar spacer, a light shielding part, and the like can be given. Each will be described below.

(I) Optical path difference adjusting layer The optical path difference adjusting layer used in the present embodiment is formed separately in the reflected light region on the transparent substrate.
The optical path difference adjusting layer is formed to adjust the distance that transmitted light and reflected light pass through the liquid crystal when the color filter of this embodiment is used in a transflective liquid crystal display device. Is.

For example, as shown in FIG. 4, the overcoat layer on the colored layer for reflected light has an optical path difference adjusting function, and the film thickness is sufficient to adjust the optical path difference between transmitted light and reflected light. If not, the optical path difference adjusting layer is formed separately on the overcoat layer on the reflected light colored layer, and is a layered portion of the overcoat layer and the optical path difference adjusting layer. The thickness is formed such that the optical path of the reflected light can be made half the optical path of the transmitted light.
Further, when the overcoat layer on the colored layer for reflected light does not have an optical path difference adjusting function, the optical path difference adjusting layer is formed separately in the reflected light region on the transparent substrate, and the optical path of the reflected light Is formed so as to have a film thickness that can be half of the optical path of transmitted light. In this case, the optical path difference adjusting layer may be formed on the reflected light region of the overcoat layer 3 as shown in FIG. 9, or the reflected light directly on the transparent substrate 1 as shown in FIG. It may be formed in the use area. Here, since reference numerals not described in FIGS. 9 and 10 can be the same as those in FIG. 4, description thereof is omitted here.
Here, since the optical path difference adjusting layer is formed to adjust the distance that transmitted light and reflected light pass through the liquid crystal, as shown in FIG. In the case where the coat layer has an optical path difference adjusting function and has a film thickness that can make the optical path of the reflected light half of the optical path of the transmitted light, the optical path difference adjusting layer is not formed.

  Moreover, in this embodiment, it is formed on the colored layer for reflected light of at least one color among the overcoat layers formed on the colored layer for reflected light of a plurality of colors used in the color filter of this embodiment. When the overcoat layer does not have an optical path difference adjusting function or when it is necessary to supplement the film thickness with the optical path difference adjusting layer, the optical path difference adjusting layer is formed.

  The material of the optical path difference adjusting layer used in this embodiment is particularly limited as long as it is transparent and can form an optical path difference adjusting layer having a thickness that can adjust the optical path difference between transmitted light and reflected light. It can be made to be the same as that used for a general transparent resin member.

(Ii) Columnar spacer The columnar spacer used in the present embodiment is formed in order to keep the thickness of the layer formed on the color filter constant.

Such a columnar spacer is not particularly limited as long as it can be formed at a desired height. For example, as shown in FIG. 11, the columnar spacer 6 may be formed integrally with the overcoat layer 3. For example, as shown in FIG. 12, the columnar spacer 6 is made of resin or the like on the light shielding portion 4. For example, as shown in FIG. 13, the columnar spacer 6 is formed on the light-shielding portion 4 using a coloring layer forming coating solution. However, in this embodiment, the columnar spacer 6 is preferably formed integrally with the overcoat layer 3. This is because by forming the overcoat layer and the columnar spacers together using a multi-tone mask, it is not necessary to separately form the columnar spacers, so that the manufacturing process can be simplified.
In FIGS. 11 to 13, reference numerals that are not described can be the same as those in FIG.

  The shape, height, and the like of the columnar spacer can be the same as those of a columnar spacer used in a general color filter, and thus description thereof is omitted here.

(Iii) Light Shielding Part The light shielding part used in the present embodiment is formed on the transparent substrate and demarcates pixels. Such a light-shielding part can be the same as the light-shielding part used in a general color filter, and therefore description thereof is omitted here.

2. Second Embodiment A color filter according to this embodiment is formed in a transparent substrate, a colored layer for transmitted light of a plurality of colors formed in the transmitted light region on the transparent substrate, and a reflected light region on the transparent substrate. A transflective liquid crystal display having a plurality of colored layers for reflected light, and the transparent substrate, the colored layer for transmitted light, and an overcoat layer formed so as to cover the colored layer for reflected light A color filter for a device, wherein the overcoat layer is made of a material having Rth, and when the color filter for a transflective liquid crystal display device is used in a transflective liquid crystal display device, The colored layer for transmitted light of each color and the colored for reflected light of each color so that the Rth included in the color filter for the transflective liquid crystal display device and the Rth of the liquid crystal display device without the color filter are offset. The overcoat layer has a different thickness depending on Rth of the layer.

  Here, “the Rth that the color filter has and the Rth that the color filter non-installed liquid crystal display device cancels” means that the Rth that the layered portion for transmitted light of each color of the color filter has and the above of each color The absolute value of the difference from the Rth of the liquid crystal display device without the color filter in the wavelength region corresponding to the colored layer for transmitted light, the Rth that the reflected light laminated portion of each color has, and the colored for reflected light of each color The absolute value of the difference from the Rth of the liquid crystal display device without the color filter in the wavelength region corresponding to the layer is used in the transflective liquid crystal display device in which the color filter has the liquid crystal display device without the color filter. In such a case, even if the image is viewed from an oblique direction during black display, the display is not colored black and the contrast can be improved. It refers to the fact that a close value. Specifically, the absolute value of the Rth difference is 5 nm or less, especially 3 nm or less, particularly 1 nm or less.

  Further, here, “Rth of the liquid crystal display device without the color filter” means the transflective liquid crystal display device itself in a state where the color filter of this embodiment is not attached to the transflective liquid crystal display device. Refers to Rth. Further, such Rth can be obtained by, for example, measuring Rth for a configuration other than a color filter used in a transflective liquid crystal display device, and by simulation. The film thickness and Rth measurement method of the configuration other than the color filter used in the transflective liquid crystal display device can be the same as the film thickness and Rth of the overcoat layer described above. Is omitted.

In the present embodiment, as the liquid crystal display device without a color filter used in combination, the signs of Rth in the liquid crystal display device without a color filter may be all positive or all negative, or both positive and negative are mixed. It may be the case.
In the color filter of this embodiment, Rth is adjusted by the overcoat layer. Therefore, as the liquid crystal display device without a color filter, all the signs of Rth in the liquid crystal display device without a color filter are positive, or Those that are all negative are more preferred.

The liquid crystal display device without a color filter has a configuration used for a general transflective liquid crystal display device. Depending on the configuration, the liquid crystal display device without a color filter exhibits wavelength dependency. There is a case. As such wavelength dependence, for example, the Rth on the short wavelength side is smaller than the Rth value on the long wavelength side, and the reverse dispersion type wavelength dependence, for example, the Rth on the short wavelength side is on the long wavelength side. The wavelength dependence of the positive dispersion type which becomes larger than the value of Rth of is mentioned. In addition, there is a case where Rth of the liquid crystal display device without the color filter indicates a flat type having no wavelength dependency.
In this embodiment, a color filter having an Rth that cancels the Rth of the liquid crystal display device without the color filter may be used. The Rth of the laminated portion for use is determined by the Rth of the liquid crystal display device without the color filter.

For example, when the liquid crystal display device without the color filter exhibits reverse dispersion type wavelength dependence, the Rth on the short wavelength side is smaller than the Rth value on the long wavelength side, and therefore the liquid crystal without the color filter is provided. In order to cancel out the Rth of the display device, the Rth of the transmitted light laminated portion and the reflected light laminated portion of the short wavelength side is equal to the Rth of the short wavelength side color Rth. It is adjusted to be larger than the value.
In addition, for example, when the liquid crystal display device without the color filter has a positive dispersion type wavelength dependency, the Rth on the short wavelength side is larger than the Rth value on the long wavelength side, so the color filter is not attached. In order to cancel out the Rth of the liquid crystal display device, the Rth of the transmission light lamination portion and the reflection light lamination portion of the short wavelength side is equal to the Rth of the short wavelength side color Rth. It is adjusted to be smaller than the value of.
Further, for example, when the liquid crystal display device without the color filter is a flat type having no wavelength dependency, Rth is constant, so that Rth included in the layered portion for transmitted light and the layered portion for reflected light of each color is In each color, the liquid crystal display device without the color filter is adjusted so as to cancel out a predetermined Rth.
Here, Rth of the laminated portion for transmitted light of each color and the laminated portion for reflected light of each color is a film of an overcoat layer having Rth according to Rth of the colored layer for transmitted light and the colored layer for reflected light of each color It is adjusted by changing the thickness.

The relationship between the Rth of the color filter in this embodiment and the Rth of the liquid crystal display device without the color filter will be described with reference to the drawings.
First, the case where the Rth of the color filter of the present embodiment and the Rth of the liquid crystal display device not equipped with the color filter showing the inverse dispersion type wavelength dependence are offset will be described with reference to FIG.
FIG. 14 is a diagram showing an example of Rth distribution of the color filter of the present embodiment. FIG. 14 shows a case in which the colored layer for transmitted light and the colored layer for reflected light are three colors of red, green, and blue. At this time, the liquid crystal display device without the color filter has, for example, Rth of +30 nm in the red light region, +25 nm in the green light region, and +20 nm in the blue light region. In this case, on the colored layer for transmitted light and the colored layer for reflected light of the color filter of this embodiment, as shown in FIG. 14, a red transmitted light layer portion R (t) and a reflected light layer portion R Rth of (r) is −30 nm, green light transmission layered portion G (t) and reflected light layered portion G (r) is −25 nm, blue light transmitted layered portion B (t) and reflected light Overcoats having different thicknesses depending on the Rth of the colored layer for transmitted light of each color and the colored layer for reflected light of each color, so that the Rth of the laminated portion B (r) is −20 nm. A layer is formed.

  Next, the case where the Rth of the color filter of this embodiment and the Rth of the liquid crystal display device without the color filter exhibiting the positive dispersion type wavelength dependency are offset will be described with reference to FIG. FIG. 15 is a diagram illustrating an example of Rth distribution of the color filter of the present embodiment. FIG. 15 shows a case where the transmitted light colored layer and the reflected light colored layer are three colors of red, green, and blue. At this time, the liquid crystal display device without the color filter has Rth of, for example, +20 nm in the red light region, +25 nm in the green light region, and +30 nm in the blue light region. In this case, on the colored layer for transmitted light and the colored layer for reflected light of the color filter of this embodiment, as shown in FIG. 15, a red transmitted light layer portion R (t) and a reflected light layer portion. Rth of R (r) is −20 nm, green transmission layer G (t) and reflected light layer G (r) are −25 nm, blue transmission layer B (t) and reflection Overcoat layers having different thicknesses depending on the Rth of the colored layer for transmitted light and the colored layer for reflected light, depending on the material having Rth, so that the Rth of the laminated portion B (r) for light is −30 nm. Is formed.

  Next, a case where Rth of the color filter of this embodiment and Rth of the flat liquid crystal display device without the color filter are offset will be described with reference to FIG. FIG. 16 is a diagram showing an example of Rth distribution of the color filter of the present embodiment. FIG. 16 shows a case where the transmitted light colored layer and the reflected light colored layer are three colors of red, green, and blue. At this time, the liquid crystal display device without the color filter does not exhibit wavelength dispersion, and has Rth of +30 nm in the red light region, the green light region, and the blue light region. In this case, as shown in FIG. 16, on the colored layer for transmitted light and the colored layer for reflected light of the color filter of the present embodiment, a red transmitted light layer portion R (t) and a reflected light layer portion. Rth of R (r), Rth of green transmitted light layer G (t) and reflected light layer G (r), Blue transmitted light layer B (t) and reflected light layer B ( The overcoat layers having different film thicknesses are formed by the materials having Rth so that the Rth of r) is −30 nm, depending on the Rth of the colored layer for transmitted light of each color and the colored layer for reflected light of each color. The

Here, the wavelength dependency exhibited by the liquid crystal display device with no color filter used in combination with the color filter of the present embodiment is determined by the wavelength dependency exhibited by each component in the liquid crystal display device with no color filter. As the wavelength dependency exhibited by the liquid crystal display device without the color filter, the following wavelength dependency can be considered in addition to the above-described reverse dispersion type, normal dispersion type, and flat type.
For example, when the configuration in the liquid crystal display device without the color filter has a configuration exhibiting reverse dispersion wavelength dependency and a configuration exhibiting normal dispersion wavelength dependency, the red wavelength region and the blue wavelength Wavelength dependency such that Rth in the region is larger than Rth in the green wavelength region, or wavelength dependency such that Rth in the green wavelength region is larger than Rth in the red wavelength region and the blue wavelength region, etc. Conceivable.
Even when the Rth of the liquid crystal display device without the color filter having such wavelength dependency is offset from the Rth of the color filter of the present embodiment, the above-described inverse dispersion type, normal dispersion type, and flat type are used. The Rth of the color filter is adjusted in the same manner as in the case of canceling out the Rth of each liquid crystal display device with no color filter and the Rth of the color filter of this embodiment.

According to this embodiment, as described above, the Rth of the color filter and the Rth of the liquid crystal display device without the color filter cancel each other, so that the color filter is attached and the transflective liquid crystal display device is attached. It is possible to improve the contrast at the time.
The reason why the contrast can be improved by canceling out the Rth of the color filter and the Rth of the liquid crystal display device without the color filter is as follows. Since the absolute value of Rth of the entire transflective liquid crystal display device using the color filter of the present embodiment can be reduced, the intensity of leakage light can be reduced. This is because it becomes possible.
Each configuration will be described below.

a. Overcoat layer The overcoat layer used in this embodiment is the same as described above. When the color filter of this embodiment is used in a transflective liquid crystal display device, the Rth of the color filter and the color filter are not attached. In order to cancel out Rth of the liquid crystal display device, it is formed with a different film thickness depending on the colored layer for transmitted light and the colored layer for reflected light of each color.

  The material used for the overcoat layer, the forming method, the maximum film thickness, the minimum film thickness, and the like can be the same as those in “1. First embodiment”, and thus description thereof is omitted here.

In the present embodiment, the film thickness of the overcoat layer to be formed is determined so as to cancel Rth of the liquid crystal display device not equipped with the color filter used in combination with the color filter of the present embodiment. In this embodiment, the overcoat layer formed on the colored layer for reflected light may have an optical path difference adjusting function.
The optical path difference adjustment function is the same as that described in the section “1. First Embodiment”, and therefore the description thereof is omitted here.

In this embodiment, as shown in the distribution of Rth of the layered portion for transmitted light and the layered portion for reflected light of the color filter in FIGS. 14 to 16, the colored layer for reflected light is usually more than the region for transmitted light. Since it is formed in a thin film, the Rth of the colored layer for reflected light is smaller than the value of Rth of the colored layer for transmitted light. Therefore, in order that the laminated portion for transmitted light and the laminated portion for reflected light have the same Rth, the film thickness of the overcoat layer formed on the reflected light region is the overcoat layer formed on the transmitted light region. It becomes larger than the film thickness of the coat layer. With the overcoat layer formed in this way, for each color, the thickness of the laminated portion for reflected light can be made larger than the thickness of the laminated portion for transmitted light, so the optical path difference between reflected light and transmitted light can be reduced. It becomes possible to adjust.
In this embodiment, it is most preferable to adjust the optical path difference between the reflected light and the transmitted light using only the overcoat layer formed on the reflected light region. However, when the color filter of this embodiment is used in a transflective liquid crystal display device, the overcoat layer has an Rth that the color filter has and an Rth that the liquid crystal display device without the color filter has. Therefore, the overcoat layer formed on the reflected light region is used for adjusting the optical path difference because the film thickness differs depending on Rth of the colored layer for transmitted light and the colored layer for reflected light. It may be difficult to have a sufficient film thickness. In this case, the optical path difference adjusting layer is formed separately on the overcoat layer formed on the reflected light region, and the optical path difference between the reflected light and the transmitted light is adjusted.

Further, FIGS. 14 to 16 show the case where the Rth of the colored layer for transmitted light and the colored layer for reflected light of each color are all the same. For example, as shown in FIG. When the Rth of the colored layer for transmitted light and the colored layer for reflected light are different (FIG. 17 shows that Rth of the colored layer for red transmitted light and the colored layer for red reflected light is negative, the colored layer for green transmitted light and the green reflected color This also shows the case where Rth of the colored layer for light is negative and Rth of the colored layer for blue transmitted light and the colored layer for blue reflected light is positive. An overcoat layer is formed so as to cancel out Rth of the liquid crystal display device not equipped with a color filter. At this time, for example, the liquid crystal display device without a color filter used in combination does not exhibit wavelength dispersion, and has a Rth of +30 nm in the red light region, the green light region, and the blue light region. In this case, the overcoat layer formed on the red and green colored layers for reflected light has a larger film thickness than the overcoat layer formed on the colored layer for transmitted light, and thus has an optical path difference adjusting function. The overcoat layer formed on the blue colored layer for reflected light has a smaller film thickness than the overcoat layer formed on the colored layer for transmitted light, and thus does not have an optical path difference adjusting function. .
In this embodiment, the overcoat layer formed on the colored layer for reflected light of at least one color among the overcoat layers formed on the colored layer for reflected light of the plurality of colors used in the color filter of this embodiment. It only has to have a coat layer.

Here, when the sign of Rth of the colored layer for transmitted light and the colored layer for reflected light is different from the sign of Rth of the overcoat layer, it is formed on the colored layer for transmitted light and the colored layer for reflected light. The overcoat layer cancels Rth of the colored layer for transmitted light and the colored layer for reflected light, and the color filter is not mounted in a wavelength region corresponding to the colored layer for transmitted light and the colored layer for reflected light. The film thickness is adjusted so that Rth of the display device can be offset.
For example, when the colored layer of each color of the color filter of the present embodiment shows the Rth distribution as shown in FIG. 17, the overcoat layer formed on the blue transmitted light colored layer is the Rth of the blue transmitted light colored layer. The film thickness is adjusted so as to have Rth of −50 nm so that (20 nm) can be canceled and Rth (30 nm) of the display device without a color filter can be canceled. Similarly, the overcoat layer formed on the colored layer for reflected blue light cancels out Rth (10 nm) of the colored layer for reflected blue light, and offsets Rth (30 nm) of the display device without the color filter. The film thickness is adjusted so as to have an Rth of −40 nm.

b. Colored layer for transmitted light and colored layer for reflected light The colored layer for transmitted light used in this embodiment is formed in a region for transmitted light on a transparent substrate. Moreover, the colored layer for reflected light used in the present embodiment is formed in the reflected light region on the transparent substrate. In normal color filters, red, green, and blue are used.

The Rth of the colored layer for transmitted light and the colored layer for reflected light used in this embodiment varies depending on the color filter used. However, the color filter is used in a transflective liquid crystal display device. The absolute value of the difference between the Rth of the laminated portion for transmitted light of each color and the Rth of the liquid crystal display device without the color filter in the wavelength region corresponding to the colored layer for transmitted light of each color, and The absolute value of the difference between the Rth included in the layered portion for reflected light of each color and the Rth of the liquid crystal display device without the color filter in the wavelength region corresponding to the colored layer for reflected light of each color is 10 nm or less, particularly 8 nm. In particular, the thickness is particularly preferably 5 nm or less. This is because, when the above range is exceeded, the Rth of the liquid crystal display device without the color filter cannot be offset by the overcoat layer.
The absolute value of the difference between the Rth of the laminated portion for transmitted light of each color and the Rth of the liquid crystal display device without the color filter, and the Rth of the laminated portion for reflected light of each color and the liquid crystal display device without the color filter The lower limit of the absolute value of the difference from Rth is 1 nm or more. This is because, when it is less than the above range, it is not so necessary to cancel the Rth of the color filter and the Rth of the liquid crystal display device without the color filter using an overcoat layer.

  The material, forming method, shape, film thickness, etc. of the colored layer for transmitted light and the colored layer for reflected light used in this embodiment are the same as those described in the section “1. First embodiment”. The description here is omitted.

c. Transparent Substrate The transparent substrate used in this embodiment can be the same as that described in the section “1. First Embodiment”, and will not be described here.

d. Others Other members and applications used in the present embodiment can be the same as those described in the section “1. First embodiment”, and thus the description thereof is omitted here.

B. Next, a method for producing a color filter of the present invention will be described.
In the present invention, a color filter manufacturing method (hereinafter referred to as a third embodiment) for manufacturing the color filter described in the section “A. Color filter 1. First embodiment”, and “A. Color filter”. Filter 2. There are two modes: a color filter manufacturing method (hereinafter referred to as a fourth embodiment) for manufacturing a color filter of “second embodiment”.
Each will be described below.

1. Third Embodiment A color filter manufacturing method according to the present embodiment is a manufacturing method for manufacturing a color filter described in the section “A. Color filter 1. First embodiment”, for transmitted light on a transparent substrate. A colored layer forming step of forming a colored layer for transmitted light of a plurality of colors in a region and forming a colored layer for reflected light of a plurality of colors in a region for reflected light on the transparent substrate; An overcoat layer forming coating solution for forming an overcoat layer for forming a layer and an overcoat layer formed so as to cover the colored layer for reflected light using a material having Rth The overcoat layer forming layer is formed by applying the liquid preparation step and the overcoat layer forming coating solution so as to cover the transparent substrate, the transmitted light colored layer, and the reflected light colored layer. Overcoat Forming a layer for forming and exposing the overcoat layer forming layer using a multi-tone mask, and developing the layer to form the transmitted light colored layer and the transmitted light region in the transmitted light region. The Rth of the laminated portion of the coat layer is uniform, and the Rth of the laminated portion of the overcoat layer formed in the colored layer for reflected light and the region for reflected light of each color is uniform. An overcoat layer forming step of forming an overcoat layer in such a manner that the film thickness of the overcoat layer is different depending on Rth of the colored layer for transmitted light of each color and the colored layer for reflected light of each color. It is a manufacturing method characterized by this.

The manufacturing method of the color filter of this embodiment is demonstrated using figures. FIG. 18 is a process diagram showing an example of a method for producing a color filter of this embodiment. The manufacturing method of the color filter of this embodiment forms the light-shielding part 4 on the transparent substrate 1, and transmits the transmitted light colored layer 2 t (in the figure, the colored layer for red transmitted light) on the transparent substrate 1. 2t (R), green transmitted light colored layer 2t (G), blue transmitted light colored layer 2t (B)) are formed, and the reflected light colored layer 2r (in the drawing) is formed in the reflected light region on the transparent substrate 1. Then, a colored layer forming step (FIG. 18A) for forming a colored layer 2r (R) for reflected red light, a colored layer 2r (G) for reflected green light, and a colored layer 2r (B) for reflected blue light) , An overcoat layer forming coating liquid preparation step (not shown) for preparing an overcoat layer forming coating liquid for forming the overcoat layer 3, and the overcoat layer forming coating liquid Apply over the substrate 1, the colored layer for transmitted light 2t, and the colored layer for reflected light 2r. The overcoat layer forming layer forming step (FIG. 18B) for forming the coat layer forming layer 3 ′ and the overcoat layer forming layer 3 ′ are exposed with exposure light using a multi-tone mask 60. (FIG. 18C), and an overcoat layer forming step (FIG. 18D) for forming the overcoat layer 3 by subsequent development.
Here, the overcoat layer 3 includes the colored layer 2t for transmitted light of each color and the Rth of the laminated part for transmitted light of each color and the Rth of the laminated part for reflected light of each color are uniform. It is formed by changing the film thickness according to Rth of the colored layer 2r for reflected light of each color.
Accordingly, in the overcoat layer forming coating liquid preparation step, the Rth of the laminated portion for transmitted light of each color can be made uniform, and the Rth of the laminated portion for reflected light of each color can be made uniform. An overcoat layer-forming coating solution having an Rth of 5 is prepared.

According to this embodiment, by forming the overcoat layer having Rth, the Rth of the layered portion for transmitted light of each color is made uniform, and the Rth of the layered portion for reflected light of each color is made uniform. Can do. Thereby, in the transflective liquid crystal display device using the manufactured color filter, in both cases of the transmissive display and the reflective display, when the color is observed from the oblique direction during the black display, There can be no black display.
In addition, according to the present invention, overcoat layers having different film thicknesses are formed by batch exposure using a multi-tone mask according to the Rth of the colored layer for transmitted light of each color and the colored layer for reflected light of each color. Therefore, according to the Rth of the colored layer for transmitted light of each color and the colored layer for reflected light of each color, the process is simpler and the color can be reduced at a lower cost than the case of forming the optimum retardation layer. A filter can be formed.

Hereinafter, each process will be described.
a. Colored layer forming step In the step of forming a colored layer for transmitted light of a plurality of colors in a region for transmitted light on a transparent substrate and forming a colored layer for reflected light of a plurality of colors in the region for reflected light on the transparent substrate. is there.

  About the material of the colored layer for transmitted light of each color and the colored layer for reflected light of each color used in this step, it can be the same as that described in the section of “A. Color filter”, so the description here Is omitted.

In this step, the colored layer for reflected light and the colored layer for transmitted light of each color are formed between the colored layer for reflected light and the colored layer for transmitted light of each color during transmissive display and reflective display. If the difference in color characteristics is adjusted, there is no particular limitation.
In this step, it is preferable to form the film by adjusting the thickness of the colored layer for transmitted light and the thickness of the colored layer for reflected light. The same material can be used for the colored layer for transmitted light and the colored layer for reflected light, and the colored layer for reflected light and the colored layer for transmitted light of each color can be formed at once by a multi-tone mask. Because.

Further, in this step, as shown in FIG. 8, since the overcoat layer formed in the subsequent step has flatness, the colored layers of the respective colors may be formed with different thicknesses.
When forming colored layers with different thicknesses, adjust the composition of the coating liquid for forming the colored layer for transmitted light and the colored layer for reflected light to vary the brightness and color purity between colors. It shall be formed so that there is little.

  The method for forming the colored layer for transmitted light and the colored layer for reflected light used in this step can be the same as the method used for a general method for forming a color filter. Therefore, the description is omitted here.

b. Overcoat Layer Forming Coating Solution Preparation Step This step is an overcoat layer for forming an overcoat layer formed so as to cover the transparent substrate, the transmitted light colored layer, and the reflected light colored layer. In this step, a coating layer forming coating solution is prepared using a material having Rth.

In this step, the material used for the preparation of the overcoat layer-forming coating solution is such that the Rth of the layered portion for transmitted light of each color is uniform, and the Rth of the layered portion for reflected light of each color is uniform. There is no particular limitation as long as it has a certain Rth and can form an overcoat layer.
About the material of the said coating liquid for overcoat layer formation, since it can be made to be the same as that of the material of the overcoat layer demonstrated in the term of "A. Color filter", description here is abbreviate | omitted.

The overcoat layer-forming coating solution prepared in this step contains a solvent in addition to the materials described above.
Since the solvent used in this step can be the same as the solvent used when forming a general resin member, description thereof is omitted here.

c. Layer formation step for overcoat layer formation In this step, the overcoat layer formation coating solution is applied so as to cover the transparent substrate, the colored layer for transmitted light, and the colored layer for reflected light. This is a step of forming a layer forming layer.

  The film thickness of the overcoat layer forming layer formed in this step is such that the Rth of the laminated portion for transmitted light of each color can be made uniform and the Rth of the laminated portion for reflected light of each color can be made uniform. It is sufficient that an overcoat layer having a film thickness of 1 can be formed, and among the overcoat layers formed on the colored layer for transmitted light of each color and the colored layer for reflected light of each color, the maximum film thickness is at least If it has, it will not specifically limit.

  The formation method of the overcoat layer forming layer used in this step is not particularly limited as long as it can be formed on the entire surface of the transparent substrate so as to cover the transparent substrate and the colored layer. For example, spin coating, casting, dipping, bar coating, blade coating, roll coating, gravure coating, flexographic printing, spray coating, and the like can be used.

d. Overcoat layer forming step In this step, the overcoat layer forming layer is exposed to light using a multi-tone mask and then developed, so that the Rth of the transmitted light laminated portion of each color becomes uniform, and The overcoat layer has a different thickness depending on the Rth of the colored layer for transmitted light and the colored layer for reflected light so that the Rth of the laminated portion for reflected light of each color is uniform. This is a step of forming a coat layer.

  The multi-tone mask used in this process is for the transmitted light of each color so that the Rth of the layered portion for transmitted light of each color is uniform and the Rth of the layered portion for reflected light of each color is uniform. There is no particular limitation as long as it is a multi-tone mask capable of exposing the overcoat layer forming layer so that the film thickness of the overcoat layer varies depending on Rth of the colored layer and the colored layer for reflected light. . As such a multi-tone mask, a commonly used mask can be used, but a light shielding film layer and a semitransparent film layer are formed on a transparent substrate, and the light shielding film layer is formed on the transparent substrate. More preferably, the halftone mask has a light-shielding region provided, a semi-transparent region in which only a semi-transparent film layer is provided on a transparent substrate, and a transmission region having only the transparent substrate.

  Further, the exposure method is not particularly limited, and for example, proximity exposure can be performed in which a multi-tone mask is arranged with a gap of about several tens of μm from the surface of the photosensitive resin layer to perform exposure. . This exposure causes a photoreaction at the irradiated part.

After the exposure, development is performed.
When a negative photosensitive resin is used, the overcoat layer forming layer is partially removed by development. Specifically, a portion cured by exposure remains, and the other portion is selectively removed. While the curing reaction proceeds sufficiently at the part exposed from the transmission region of the multi-tone mask, the curing reaction becomes insufficient at the part exposed from the translucent region. And the overcoat layer from which a film thickness differs according to the colored layer for reflected light of each color can be formed.
When a positive photosensitive resin is used, the exposed portion is selectively removed by development. In this case, the portion exposed from the transmission region of the multi-tone mask is removed by sufficiently proceeding photodegradation reaction, and the portion exposed from the light-shielding region of the multi-tone mask remains, and is exposed from the translucent region. Since the decomposition reaction is insufficient at the sites, it is possible to form overcoat layers having different film thicknesses according to the colored layer for transmitted light and the colored layer for reflected light of each color.
In the case of using either a negative photosensitive resin or a positive photosensitive resin, development can be performed according to a general alkali development method.

  Moreover, you may heat-process (post-bake) with respect to the formed overcoat layer after exposure and image development. This heat treatment can be appropriately set, for example, at a temperature of 100 ° C. to 250 ° C. and a treatment time of about 10 minutes to 60 minutes.

  In this embodiment, at the time of exposure, the film thickness of the overcoat layer formed on the colored layer for reflected light is larger than the film thickness of the overcoat layer formed on the colored layer for transmitted light. By performing exposure using a multi-tone mask, an optical path difference adjusting function may be imparted to the overcoat layer formed on the colored layer for reflected light. This is because when the manufactured color filter is a transflective liquid crystal display device, the optical path difference between the transmitted light and the reflected light can be adjusted using the overcoat layer.

e. Other Steps In the color filter manufacturing method of the present embodiment, the above-described colored layer forming step, overcoat layer forming coating liquid preparing step, overcoat layer forming layer forming step, and overcoat layer forming step If it has, it will not specifically limit, A required process can be added suitably. In this embodiment, in order to manufacture the color filter described in the section “A. Color filter 1. First embodiment” with high accuracy, it is preferable to have a design process for designing the color filter. The design method of the color filter used in the design process will be described in the section “C. Design method of color filter” described later.
Also, for example, an optical path difference adjusting layer forming step for forming an optical path difference adjusting layer in a reflected light region on a transparent substrate, a light blocking portion forming step for forming a light blocking portion on the transparent substrate, and a columnar spacer for forming a column spacer You may have a formation process. The columnar spacers are formed integrally with the overcoat layer by performing exposure using a multi-tone mask in which the overcoat layer and the columnar spacer layer are formed during the exposure in the overcoat layer forming step described above. It is more preferable.

2. Fourth Embodiment A color filter manufacturing method according to this embodiment is a manufacturing method for manufacturing a color filter described in the above-mentioned section “A. Color filter 2. Second embodiment”, on a transparent substrate. A colored layer forming step of forming a colored layer for transmitted light of a plurality of colors in the transmitted light region, and forming a colored layer for reflected light of a plurality of colors in the reflected light region on the transparent substrate; the transparent substrate; Overcoat layer formation in which a coating liquid for forming an overcoat layer for forming a colored layer for light and an overcoat layer formed so as to cover the colored layer for reflected light is prepared using a material having Rth The overcoat layer forming layer is formed by coating the coating liquid for forming the overcoat layer and the coating liquid for forming the overcoat layer so as to cover the transparent substrate, the colored layer for transmitted light, and the colored layer for reflected light. Oh to form A layer forming step for forming a coat layer, and the overcoat layer forming layer is exposed to light using a multi-tone mask and then developed, so that the color filter for the transflective liquid crystal display device becomes a transflective semi-reflective type When used in a liquid crystal display device, the Rth of the color filter and the Rth of the liquid crystal display device not equipped with the color filter cancel each other, and the colored layer for transmitted light of each color and the reflected light of each color An overcoat layer forming step of forming an overcoat layer in such a manner that the film thickness of the overcoat layer varies depending on Rth of the colored layer.

According to this embodiment, by forming the overcoat layer as described above, the Rth of the color filter of this embodiment and the Rth of the liquid crystal display device without the color filter are offset. In the transflective liquid crystal display device, the contrast can be improved.
Further, in this embodiment, the overcoat layer is formed by batch exposure using a multi-tone mask, so that the Rth of the transmission light lamination portion of each color and the Rth of the reflection light lamination portion of each color are obtained. Since it is possible to adjust, it is possible to simplify the process compared with the case where Rth is adjusted by forming an optimum retardation layer in each of the above-described colored layer for transmitted light and colored layer for reflected light. It becomes.

  The colored layer forming step and the overcoat layer forming layer forming step used in the color filter manufacturing method of the present embodiment can be the same as the steps described in the section “1. Third embodiment”. Therefore, the description here is omitted.

a. Overcoat layer-forming coating liquid preparation step This step is an overcoat for forming an overcoat layer formed so as to cover the transparent substrate, the transmitted light colored layer, and the reflected light colored layer. In this step, the layer forming coating solution is prepared using a material having Rth.

The material of the overcoat layer forming coating liquid used in this step includes Rth of a color filter having an overcoat layer formed by the overcoat layer forming coating liquid, and the liquid crystal display device not mounted with the color filter. The material is not particularly limited as long as it has a Rth that can compensate for the Rth of the material and can form the overcoat layer.
About the material of the said coating liquid for overcoat layer formation, since it can be made to be the same as that of the material of the overcoat layer described in the term of "1. 3rd embodiment", description here is abbreviate | omitted.

b. Overcoat layer forming step This step is performed when the overcoat layer forming layer is exposed to light using a multi-tone mask and then developed, so that the color filter is used in a transflective liquid crystal display device. The overcoat layer according to the Rth of the colored layer for transmitted light and the colored layer for reflected light so that the Rth of the color filter and the Rth of the liquid crystal display device without the color filter are offset. In this step, the overcoat layer is formed in such a manner that the film thicknesses thereof are different.

The multi-tone mask used in this step is an Rth that the color filter has when the color filter manufactured by the color filter manufacturing method of the present embodiment is used in a transflective liquid crystal display device, Overcoat so that the thickness of the overcoat layer differs depending on the Rth of the colored layer for transmitted light and the colored layer for reflected light so that the Rth of the liquid crystal display device without the color filter is offset. There is no particular limitation as long as the layer forming layer can be exposed.
The gradation mask and the exposure machine used in this step can be the same as those described in the section “1. Third embodiment”, and thus description thereof is omitted here.
Further, the development process and the drying process performed after the exposure can be the same as those described in the section of “1. Third embodiment”, and thus description thereof is omitted here.

c. Other Steps In the method for producing a color filter of this embodiment, the above-described colored layer forming step, overcoat layer forming coating liquid preparing step, overcoat layer forming layer forming step, overcoat layer forming step, And if it has an optical path difference adjustment layer formation process, it will not specifically limit, A required process can be added suitably. In this embodiment, in order to manufacture the color filter described in the section of “A. Color filter 1. Second embodiment” with high accuracy, it is preferable to have a design process for designing the color filter. The design method of the color filter used in the design process will be described in the section “C. Design method of color filter” described later.
The other steps can be the same as those described in the section “1. Third embodiment”, and thus the description thereof is omitted here.

C. Color Filter Design Method The color filter design method of the present invention is a method for designing the color filter described in the section “A. Color Filter”.

  In the present invention, a method for designing a color filter described in the section “A. Color filter 1. First embodiment” (hereinafter, referred to as a fifth embodiment), and “A. Color filter, second embodiment”. There are two embodiments with the method of designing the color filter described in the section “Aspect” (hereinafter referred to as the sixth embodiment). Each embodiment will be described below.

1. Fifth Embodiment A color filter design method according to this embodiment is a design method for designing a color filter described in the section “A. Color filter 1. First embodiment”. After forming a colored layer for design transmitted light in a plurality of colors in the light region and forming a colored layer for design reflected light in a plurality of colors in the reflected light region on the design transparent substrate, the transmitted light for design And measuring the Rth of the colored layer for reflected light and the colored layer for reflected light for design, and the colored layer for transmitted light and the transmitted light region for each color based on the result of the measured step. The Rth of the laminated portion of the design overcoat layer (hereinafter referred to as the laminated portion for transmitted light for design) is uniform, and the colored layer for reflected light for design and the region for reflected light of each color are provided. The above design design A material having Rth used for forming the design overcoat layer is selected so that the Rth of the laminate portion of the coat layer (hereinafter referred to as the design reflected light laminate portion) is uniform. An overcoat layer adjusting step for determining a film thickness of the overcoat layer for design according to Rth of the colored layer for transmitted light for design and the colored layer for reflected light for design of each color. Is the method.

According to this embodiment, Rth of the colored layer for transmitted light for design and the colored layer for reflected light for design of each color is measured, and the material of the design overcoat layer is selected based on the measurement result, and the film By determining the thickness, it is possible to design a color filter in which the Rth of the design light transmission layer for each color is uniform and the Rth of the design reflection light layer for each color is uniform. It becomes possible.
Hereinafter, each step will be described.

a. Measurement Step The measurement step in this embodiment is to form a plurality of colors of the transmitted light colored layer for design on the transmitted light region on the transparent substrate for design, and to add a plurality of colors to the reflected light region on the transparent substrate. This is a step of measuring Rth of the colored light layer for design transmitted light and the colored layer for reflected light for design after the colored layer for reflected light for design is formed.
The color filter design method of this embodiment is a method of designing a color filter that is actually manufactured.
Therefore, the process for forming the colored layer for transmitted light for design and the colored layer for reflected light in the present step is the above-mentioned item “B. Color filter manufacturing method 1. Third embodiment a. Colored layer forming step”. It can be the same as the process described in.

As a method for measuring Rth of the colored layer for transmitted light and the colored layer for reflected light used in this step, each Rth of the colored layer for transmitted light and the colored layer for reflected light is accurately measured. It is not particularly limited if possible. As the measuring method used in this step, the thickness of the colored layer for transmitted light and the colored layer for reflected light is the same as the method for measuring the film thickness of the overcoat layer, so description thereof is omitted here. . The Rth of the colored layer for transmitted light and the colored layer for reflected light has a wavelength of 620 nm for the colored layer for red transmitted light and the colored layer for reflected light, and the green colored layer for reflected light and reflected light. Using a phase difference measuring device (Axoscan ^TM Mueller Matrix Polarimeter manufactured by AXOMETRICS) with a wavelength of 550 nm for the colored layer for light and a wavelength of 450 nm for the colored layer for blue transmitted light and the colored layer for reflected light, respectively. The measured value shall be used.

b. Overcoat layer adjustment step The overcoat layer adjustment step in this embodiment is based on the result of the measurement step described above, the Rth of the transmission light laminating portion for each color is uniform, and the design Rth used for forming a design overcoat layer having a different thickness according to the Rth of the colored layer for transmitted light and the colored layer for reflected light so that the Rth of the laminated portion for reflected light is uniform. This is a step of selecting a material and determining the thickness of the design overcoat layer.

  In this step, the material of the overcoat layer is made so that the Rth of the design light transmission laminate for each color is uniform and the Rth of the design reflection light laminate is uniform. If it can select and can determine the film thickness of the said overcoat layer, it will not specifically limit.

FIG. 2 is a diagram illustrating an example of the Rth distribution of the color filter.
FIG. 2 shows a case where the colored layer for transmitted light and the colored layer for reflected light are three colors of red, green, and blue, and all the Rths of the colored layers have the same sign.
When the colored layer for transmitted light for design and the colored layer for reflected light for design measured in the measurement step have Rth as shown in FIG. 2, the materials having Rth used for the overcoat layer include There is no particular limitation as long as the Rth of the design transmitted light laminated portion is uniform and the Rth of the design reflected light laminated portion can be uniform, It may be a material having the same sign Rth as the colored layer for transmitted light for design and the colored layer for reflected light for design (negative Rth in the case of FIG. 2), or a material having Rth of a different sign. Also good.

Next, the case where the signs of the Rth values of the colored layers for transmitted light for design and colored layers for reflected light for design are different for each color will be described with reference to FIG.
FIG. 6 is a diagram illustrating another example of the Rth distribution of the color filter.
FIG. 6 shows that the Rth of the colored layer for red transmitted light and the colored layer for red reflected light is negative, the Rth of the colored layer for green transmitted light and the colored layer for green reflected light is negative, the colored layer for blue transmitted light and the blue reflected light This shows a case where Rth of the colored layer for use is positive.
When the design colored layer measured in the measurement step has Rth as shown in FIG. 6, the material having Rth used for the overcoat layer may include Rth included in the laminated portion for design transmitted light of each color. Is not particularly limited as long as the Rth can be made uniform and the Rth of the reflection light stack for design can be made uniform. In FIG. 6, for example, red and green designs The material having the same sign Rth as the colored layer for transmitted light and the colored layer for reflected light for design (negative Rth in the case of FIG. 6) or a material having Rth with a different sign may be used. Good.

In this step, usually, after selecting a material to be used for the overcoat layer based on the result of the measurement step, depending on the Rth value of the selected material of the overcoat layer, the transmission for design of each color is performed. The film thickness of the overcoat layer formed on the colored layer for light and the colored layer for reflected light for design is determined.
In the present embodiment, the Rth included in the design transmission light stack for each color and the Rth included in the design reflection light stack need only be uniform and have the same value. There may be different values.
Further, in this step, the Rth of the design reflection light stack is set to be larger than the Rth of the design transmission light stack, and the design formed on the design reflection light coloring layer. An optical path difference adjusting function may be provided by increasing the film thickness of the overcoat layer. In this case, the film thickness may be determined so that the optical path difference can be adjusted only by the film thickness of the design overcoat layer formed on the design reflected light colored layer. The film thickness may be determined so that it can be partly formed and adjusted by separately forming an optical path difference adjusting layer. Of the overcoat layers formed on the colored layers for reflected light of multiple colors used in color filters, the overcoat layer formed on the colored layer for reflected light of at least one color has an optical path difference adjusting function. If you do.

  In this step, the material of the design overcoat layer selected can be the same as the material of the overcoat layer described in the section “A. Color filter”, and thus description thereof is omitted here.

  The film thickness of the design overcoat layer determined in this step is appropriately determined depending on the material of the selected design overcoat layer.

c. Others The method for designing the color filter of the present embodiment is not particularly limited as long as it has at least the measurement step and the overcoat layer adjustment step described above, and a necessary step may be appropriately added. it can. For example, measure the Rth of the design light transmission laminate for each color of the designed color filter and the Rth of the design reflection light laminate for each color, and confirm that the Rth values are uniform. The confirmation process etc. to perform are mentioned.

The design method of the color filter of the present embodiment is not particularly limited as long as the color filter as described in “A. Color filter 1. First embodiment” can be designed. The color filter for design is formed in advance before the color filter manufacturing process.
If there is no problem in accuracy or the like, the design may be performed by simulation.

  Further, as described above, the color filter design method of the present embodiment is preferably used in the design process of “B. Color filter manufacturing method” described above.

  The design process using the color filter design method of the present embodiment is not particularly limited as long as a desired color filter can be designed. For example, after the color filter for design is formed in advance, the manufacturing process is performed. For example, the colored layer for transmitted light and the colored layer for reflected light formed after the first colored layer forming step of “B. Color filter manufacturing method” may be used. After performing the measurement process as a colored layer, select the material for the overcoat layer in the overcoat layer adjustment process, determine the film thickness, and then perform the first overcoat layer formation coating liquid preparation process In addition, the design process may be performed by incorporating it into the manufacturing process.

2. Sixth Embodiment A color filter design method according to this embodiment is the color filter design method described in the section “A. Color filter 2. Second embodiment”, and is used for transmitted light on a design transparent substrate. A colored layer for design transmitted light of a plurality of colors is formed in an area, and a colored layer for design reflected light of a plurality of colors is formed in a reflected light area on the transparent substrate for design, and then the colored for transmitted light for design is formed. When the color filter is used in a transflective liquid crystal display device based on the measurement step of measuring Rth of the layer and the colored layer for reflected light for design and the result of the measurement step, the color The material having Rth used for the formation of the design overcoat layer is selected so that the Rth of the filter and the Rth of the liquid crystal display device without the color filter are offset, and the light for the design light for each color is selected. Depending on the Rth of the color layer and the color the design reflection light coloring layer of a design method characterized by having an overcoat layer adjustment step of determining the thickness of the design for the overcoat layer.

According to this embodiment, by measuring the colored layer for transmitted light of each color and the colored layer for reflected light of each color, and determining the film thickness of the overcoat layer based on the measurement result, the color filter It is possible to design a color filter in which the Rth included in the liquid crystal display and the Rth included in the liquid crystal display device without the color filter are offset.
Hereinafter, each step will be described.

a. Measurement Step The measurement step in the present embodiment includes forming a plurality of design colored layers having a transmitted light region and a reflected light region on a design transparent substrate, and each color of the design transmitted light colored layer and each color. This is a step of measuring Rth of the colored layer for reflected light.
Since this step can be the same as the step described in the section “1. Fifth embodiment a. Measurement step” described above, description thereof is omitted here.

b. Overcoat layer adjustment step The overcoat layer adjustment step in the present embodiment is based on the result of the measurement step, when the color filter is used in a transflective liquid crystal display device. Formation of design overcoat layers having different film thicknesses depending on Rth of the transmitted light region and the reflected light region of each color so that the Rth of the liquid crystal display device without the color filter is offset This is a step of selecting the material having Rth used in the above and determining the film thickness of the design overcoat layer.

  For example, when the liquid crystal display device without a color filter exhibits reverse dispersion wavelength dependency, the Rth on the short wavelength side is smaller than the Rth on the long wavelength side. In order to cancel out the Rth of the liquid crystal display device not mounted with the color filter, the layer has a laminated portion for design of transmitted light for designing the color on the short wavelength side and the design as shown in the example of the Rth distribution of the color filter in FIG. 14 so that the Rth of the reflected light laminated portion is larger than the Rth of the long-wavelength colored portion for the design transmitted light colored layer and the laminated portion for the design reflected light (in FIG. 14). , Red (R), green (G), and blue (B) in order of the colored layer laminate portion for design transmitted light and the laminate portion for reflected light for design increase in order) Material coat layer is selected, the thickness of the design for the overcoat layer is determined.

  In addition, for example, when the liquid crystal display device without the color filter has a positive dispersion type wavelength dependency, the Rth on the short wavelength side is larger than the Rth on the long wavelength side. The overcoat layer for use is designed to offset the Rth of the liquid crystal display device without the color filter, and as shown in the example of the Rth distribution of the color filter in FIG. In addition, the Rth included in the design reflection light stack portion is made smaller than the Rth included in the design transmission light coloring layer stack portion and the design reflection light stack portion of the long wavelength side (see FIG. 15, the Rth of the colored layer laminate portion for design transmitted light and the laminate portion for reflected light for design decreases in the order of red (R), green (G), and blue (B)). Oh Material bar coating layer is selected, the thickness of the design for the overcoat layer is determined.

  In addition, for example, when the liquid crystal display device without the color filter is a flat type that does not exhibit wavelength dependency, Rth has a constant value regardless of the wavelength region. As shown in the example of the Rth distribution of the color filter in FIG. 16, the Rth of the laminated portion of the design coloring layer and the overcoat layer of each color is the value of Rth of the liquid crystal display device without the color filter. The material of the overcoat layer is selected so as to cancel out the above, and the film thickness of the overcoat layer is determined.

  In addition, even when the liquid crystal display device without the color filter exhibits wavelength dependency other than the reverse dispersion type, the normal dispersion type, and the flat type described above, the laminated portion of the design colored layer and the overcoat layer for each color The material of the overcoat layer is selected and the film thickness of the overcoat layer is determined so that the Rth of the liquid crystal display device without the color filter cancels the Rth value of the overcoat layer.

In this step, usually, after selecting the material used for the overcoat layer based on the result of the measurement step, the design of each color is made according to the Rth value of the selected material for the overcoat layer. The film thickness of the design overcoat layer formed on the colored layer for transmitted light and the colored layer for reflected light for each color is determined.
In this step, when all the Rths of the colored layers for transmitted light of the color filter have the same sign, the design is made so that the thickness of the design overcoat layer formed on the reflected light region is increased. A difference function may be added.

  In this step, the material for the overcoat layer for design can be the same as the material for the overcoat layer described in the section “A. Color filter”, and thus description thereof is omitted here.

c. Others The method for designing the color filter of the present embodiment is not particularly limited as long as it has at least the measurement step and the overcoat layer adjustment step described above, and a necessary step may be appropriately added. it can. The specific steps are the same as those described in the section “1. Fifth embodiment”, and thus the description thereof is omitted here.
The design method of the color filter of this embodiment is not particularly limited as long as the color filter as described in “A. Color filter 2. Second embodiment” can be designed. The color filter for design is formed in advance before the color filter manufacturing process.
If there is no problem in accuracy or the like, the design may be performed by simulation.

Further, as described above, the color filter design method of the present embodiment is preferably used in the design process of “B. Color filter manufacturing method” described above.
The case where the color filter design method of this embodiment is used in the above design process is the same as the case described in the section “1. Fifth Embodiment”, and therefore description thereof is omitted here.

D. Transflective and semi-reflective liquid crystal display device The transflective and semi-reflective liquid crystal display device of the present invention has at least the color filter described in the section “A. Color filter 2. Second embodiment”.

  According to the present invention, since the color filter is formed so that the Rth of the liquid crystal display device without the color filter is offset, a transflective liquid crystal display device with high contrast can be obtained.

In transflective liquid crystal display device of the present invention, when the luminance at the time of a white display state of the transmissive display and at the time of reflective display T _on, the luminance at the time of a black display state and a T _off, T _The contrast represented by the ratio of _on / T _off is preferably 500 or more, more preferably 800 or more, and particularly preferably 1000 or more. This is because, when it is less than the above range, the contrast is low and the display quality may be impaired.
Hereinafter, each configuration of the color filter of the present invention will be described.

a. Color Filter The color filter used in the present invention has been described in the section “A. Color Filter 2. Second Embodiment”, so description thereof is omitted here.

b. Transflective and semi-reflective liquid crystal display device The transflective and semi-reflective liquid crystal display device of the present invention is not particularly limited as long as it has at least the color filter described above.
The transflective liquid crystal display device of the present invention is used for, for example, a large display or a portable information terminal.

  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.

[Example 1]
(Formation of light shielding part)
As a transparent substrate, a glass substrate (Corning 1737 glass) having a size of 300 mm × 400 mm and a thickness of 0.7 mm was prepared. After cleaning this transparent substrate according to a conventional method, a negative photosensitive black resist (CFPR DN-83, manufactured by Tokyo Ohka Kogyo Co., Ltd.) is applied, exposed, developed, and heat-treated through a predetermined mask to obtain vertical stripe lines. A lattice-shaped light shielding portion having a width of 10 μm, a vertical stripe pitch of 150 μm, a horizontal stripe line width of 75 μm, and a horizontal stripe pitch of 450 μm was formed. Thus, openings having a short side of 150 μm and a long side of 450 μm were formed at intervals of 10 μm in the short side direction and at intervals of 75 μm in the long side direction. The region sandwiched between the openings adjacent to each other in the long side direction was a rectangular region having a length of 75 μm in the long side direction of the opening and a length of 150 μm in the short side direction of the opening.

(Creation of coloring material)
Next, a negative photosensitive resin composition for a red colored layer, a negative photosensitive resin composition for a blue colored layer, and a negative photosensitive resin composition for a green colored layer were prepared using the following pigments: . For each color, a negative photosensitive resin composition was used to form the transmission part and the reflection part.

<Negative photosensitive resin composition for red colored layer>
・ Red pigment (Chromophthal Red A2B manufactured by Ciba Specialty Chemicals)
4.8 parts by weight / yellow pigment (PASFOL Yellow D1819, manufactured by BASF) 1.2 parts by weight / dispersant (Disperbic 161, manufactured by Big Chemie) 3.0 parts by weight / monomer (SR399, manufactured by Sartomer) 4.0 weight Part / Polymer I 5.0 parts by weight / Initiator (Irgacure 907 manufactured by Ciba Specialty Chemicals)
1.4 parts by weight / initiator (2,2′-bis (o-chlorophenyl) -4,5,4 ′, 5′-tetraphenyl-1,2′-biimidazole) 0.6 parts by weight / solvent ( Propylene glycol monomethyl ether acetate) 80.0 parts by weight The above polymer I is benzyl methacrylate: styrene: acrylic acid: 2-hydroxyethyl methacrylate = 15.6: 37.0: 30.5: 16.9 (mol) Ratio) is obtained by adding 16.9 mol% of 2-methacryloyloxyethyl isocyanate to 100 mol% of the copolymer, and the weight average molecular weight is 42500.
Here, the said weight average molecular weight is calculated | required as a standard polystyrene conversion value by gel permeation chromatography (GPC).

<Negative photosensitive resin composition for blue colored layer>
Blue pigment (BASF Heliogen Blue L6700F) 6.0 parts by weight Pigment derivative (Abyssia Solsperse 5000) 0.6 parts by weight Dispersant (Bic Chemie Dispersic 161) 2.4 parts by weight Monomer (SR399, manufactured by Sartomer) 4.0 parts by weight, Polymer I, 5.0 parts by weight, initiator (Irgacure 907, manufactured by Ciba Specialty Chemicals)
1.4 parts by weight / initiator (2,2′-bis (o-chlorophenyl) -4,5,4 ′, 5′-tetraphenyl-1,2′-biimidazole) 0.6 parts by weight / solvent ( Propylene glycol monomethyl ether acetate) 80.0 parts by weight

<Negative photosensitive resin composition for green colored layer>
Green pigment (Avisia Monastral Green 9Y-C) 4.2 parts by weight Yellow pigment (BASF Paliotor 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 I, 5.0 parts by weight / initiator (Irgacure 907, manufactured by Ciba Specialty Chemicals)
1.4 parts by weight / initiator (2,2′-bis (o-chlorophenyl) -4,5,4 ′, 5′-tetraphenyl-1,2′-biimidazole) 0.6 parts by weight / solvent ( Propylene glycol monomethyl ether acetate) 80.0 parts by weight

(Formation of colored layer)
A negative photosensitive resin composition for a red colored layer is applied to the opening of the light-shielding part on the transparent substrate by a spin coating method. First, exposure and development are performed through a photomask for the colored layer for red reflected light. And firing to form a colored layer for red reflected light. Next, a negative photosensitive resin composition for a red colored layer is applied by a spin coating method, exposed, developed, and baked through a photomask for a colored layer for red transmitted light, and then a colored layer for red transmitted light. Formed. In this case, the thickness of the colored layer for reflected light was 1.8 μm, and the thickness of the colored layer for transmitted light was 2.9 μm. For the green colored layer, the thickness of the colored layer for reflected light is 1.7 μm, the thickness of the colored layer for transmitted light is 2.8 μm, and for the blue colored layer, the thickness of the colored layer for reflected light is 2.0 μm, and transmitted The light colored layer was formed in the opening of the light shielding part by the same method as the formation of the red colored layer so that the film thickness was 3.0 μm.
When Rth of these colored layers was measured, the colored layers for transmitted light of red, green, and blue were −6 nm, −12 nm, −8 nm, and the colored layers for reflected light of red, green, and blue were −4 nm, −6 nm, It was −5 nm.
Here, as a method for measuring the Rth of the colored layer, the film thickness at the center of the colored layer of each color is measured by a stylus-type film thickness measuring device P15 of KLA Tencor Co., Ltd. Using a measuring device (Axoscan ^TM Mueller Matrix Polarimeter manufactured by AXOMETRICS), the measurement wavelength was 620 nm for the red colored layer, 550 nm for the green colored layer, and 450 nm for the blue colored layer.

(Adjusting the overcoat layer)
Next, the overcoat layer was adjusted. The following were selected as the overcoat layer forming coating solution.

<Composition of coating liquid for overcoat layer formation>
・ Methyl methacrylate-styrene-acrylic acid copolymer: 32 parts by weight ・ Epicoat 180S70 (manufactured by Japan Epoxy Resin Co., Ltd.): 18 parts by weight ・ Dipentaerythritol pentaacrylate: 42 parts by weight ・ Initiator (Ciba Specialty Chemicals) Irgacure 907) ... 8 parts by weight 3-methoxybutyl acetate ... 300 parts by weight

The overcoat layer forming coating solution was applied onto a glass substrate by spin coating, exposed, developed and baked to form a single overcoat layer. When the Rth of the single layer of the overcoat layer was measured, the measurement wavelength per 1 μm was −2.5 nm at 620 nm, −2.8 nm at 550 nm, and −3.0 nm at 450 nm.
Here, the Rth of the single layer of the overcoat layer is measured with a stylus type film thickness measuring device P.15 of KLA Tencor Co., Ltd., and a retardation layer measuring device (Axoscan ^TM Mueller Matrix manufactured by AXOMETRICS) Using a polarimeter, measurements were made for three wavelengths of 620 nm (assuming a red colored layer), 550 nm (assuming a green colored layer), and 450 nm (assuming a blue colored layer).
Thus, in order to make the Rth of the red, green and blue colored layers uniform, 4.4 μm on the colored layer for red reflected light, 3.6 μm on the colored layer for red transmitted light, and on the colored layer for green reflected light 1.1 μm, 3.2 μm on the colored layer for green transmitted light, 3.3 μm on the colored layer for blue reflected light, and 2.3 μm on the colored layer for blue transmitted light. I understood.

(Formation of overcoat layer)
The transmittance of the halftone mask used for forming the overcoat layer is 80% on the colored layer for red reflected light, 60% on the colored layer for red transmitted light, 55% on the colored layer for green reflected light, It was designed so that the colored layer for green transmitted light was 20%, the colored layer for blue reflected light was 50%, the colored layer for blue transmitted light was 40%, and the columnar spacer portion was 100%. The overcoat layer-forming coating solution was applied onto the transparent substrate and the colored layer, exposed using this mask, and then developed and baked to form an overcoat layer.
When the Rth of the laminated portion of the colored layer and the overcoat layer of each color is measured, the laminated portions for transmitted light of red, green, and blue are laminated portions for reflected light of -14 nm, -15 nm, -14 nm, red, green, and blue, respectively. Were -13 nm, -14 nm, and -16 nm.
A panel was assembled using this color filter, and the chromaticity measurement from the front direction and the oblique 45 ° direction and the appearance were observed.

[Example 2]
Formation of the light-shielding portion and the colored layer was performed in the same manner as in Example 1. An overcoat layer forming coating solution was also prepared in the same manner as in Example 1.
When the Rth of each member other than the color filter was measured and the total Rth of the liquid crystal display device without the color filter was calculated, it was 16 nm for the red wavelength, 20 nm for the green wavelength, and 18 nm for the blue wavelength.
Here, as a method for measuring Rth of each of the above members, a retardation layer measuring device (Axoscan ^™ Mueller Matrix Polarimeter manufactured by AXOMETRICS) was used, and measurement wavelengths were set to three wavelengths of 620 nm, 550 nm, and 450 nm.
In order to offset Rth between the color filter and the liquid crystal display device not equipped with the color filter, 4.5 μm on the colored layer for red reflected light, 4.0 μm on the colored layer for red transmitted light, and on the colored layer for green reflected light Is required to have an overcoat layer of 5.0 μm, 2.9 μm on the colored layer for green transmitted light, 4.3 μm on the colored layer for blue reflected light, and 3.3 μm on the colored layer for blue transmitted light. I understood.

The transmittance of the halftone mask used for forming the overcoat layer is 70% on the colored layer for red reflected light, 60% on the colored layer for red transmitted light, 80% on the colored layer for green reflected light, The design was such that the colored layer for green transmitted light was 40%, the colored layer for blue reflected light was 55%, the colored layer for blue transmitted light was 45%, and the columnar spacer portion was 100%. The overcoat layer-forming coating solution was applied onto the transparent substrate and the colored layer, exposed using this mask, and then developed and baked to form an overcoat layer.
When the Rth of the laminated portion of the colored layer and the overcoat layer of each color is measured, the laminated portions for transmitted light of red, green, and blue are respectively laminated portions for reflected light of -16 nm, -21 nm, -18 nm, red, green, and blue, respectively. Were -15 nm, -20 nm, and -18 nm.
A panel was assembled using this color filter, and the appearance was observed from the front direction and an oblique 45 ° direction.

[Comparative Example 1]
Formation of the light-shielding portion and the colored layer was performed in the same manner as in Example 1.
When forming the overcoat layer, a mask with uniform transmittance was used so that all the colored layers had the same film thickness. Further, after the overcoat layer was formed, columnar spacers were formed.
A panel was assembled using this color filter, and the appearance was observed from the front direction and an oblique 45 ° direction.

[Evaluation]
At the time of black display, the coloring of Example 1 and Example 2 was improved. About the comparative example 1, it became reddish black.

DESCRIPTION OF SYMBOLS 1 ... Transparent substrate 2t, 2t (R), 2t (G), 2t (B) ... Colored layer for transmitted light 2r, 2r (R), 2r (G), 2r (B) ... Colored layer for reflected light 3 ... Overcoat layer 3 '... Overcoat layer forming layer 4 ... Light shielding part 5 ... Optical path difference adjusting layer 6 ... Columnar spacer 10 ... Color filter 60 ... Tone mask

Claims (15)

A transparent substrate, a colored layer for transmitted light of a plurality of colors formed in a region for transmitted light on the transparent substrate, a colored layer for reflected light of a plurality of colors formed in a region for reflected light on the transparent substrate, A color filter for a transflective liquid crystal display device having the transparent substrate, the colored layer for transmitted light, and an overcoat layer formed so as to cover the colored layer for reflected light,
The overcoat layer is made of a material having retardation in the thickness direction, and has a retardation in the thickness direction of a laminated portion of the colored layer for transmitted light of each color and the overcoat layer formed in the transmitted light region. The transmitted light of each color is uniform, and the retardation in the thickness direction of the laminated portion of the colored layer for reflected light of each color and the overcoat layer formed in the reflected light region is uniform. A color for a transflective liquid crystal display device, characterized in that the thickness of the overcoat layer differs depending on the thickness direction retardation of the colored layer for reflection and the colored layer for reflected light of each color filter.   The color filter for a transflective liquid crystal display device according to claim 1, wherein the overcoat layer formed in the reflected light region has an optical path difference adjusting function.   3. The color filter for a transflective liquid crystal display device according to claim 1, wherein an optical path difference adjusting layer is formed separately in the reflected light region on the transparent substrate. .   The color filter for a transflective liquid crystal display device according to any one of claims 1 to 3, wherein columnar spacers are integrally formed on the overcoat layer. A transparent substrate, a colored layer for transmitted light of a plurality of colors formed in a region for transmitted light on the transparent substrate, a colored layer for reflected light of a plurality of colors formed in a region for reflected light on the transparent substrate, A color filter for a transflective liquid crystal display device having the transparent substrate, the colored layer for transmitted light, and an overcoat layer formed so as to cover the colored layer for reflected light,
The overcoat layer is made of a material having retardation in the thickness direction. When the color filter for a transflective liquid crystal display device is used in a transflective liquid crystal display device, the transflective liquid crystal display device is used. And a retardation in the thickness direction of the color filter for the liquid crystal display device, and a retardation in the thickness direction when the transflective liquid crystal display device does not have the color filter for the transflective liquid crystal display device. The film thickness of the overcoat layer is different depending on the retardation in the thickness direction of the colored layer for transmitted light and the colored layer for reflected light of each color so as to cancel each other. A color filter for a transflective liquid crystal display device.   6. The color filter for a transflective liquid crystal display device according to claim 5, wherein the overcoat layer formed in the reflected light region has an optical path difference adjusting function.   7. The color filter for a transflective liquid crystal display device according to claim 5, wherein an optical path difference adjusting layer is formed separately in the reflected light region on the transparent substrate. .   The color filter for a transflective liquid crystal display device according to any one of claims 5 to 7, wherein a columnar spacer is integrally formed on the overcoat layer. A colored layer forming step of forming a colored layer for transmitted light of a plurality of colors in a region for transmitted light on a transparent substrate, and forming a colored layer for reflected light of a plurality of colors in the reflected light region on the transparent substrate;
An overcoat layer forming coating solution for forming an overcoat layer formed to cover the transparent substrate, the transmitted light colored layer, and the reflected light colored layer has retardation in the thickness direction. An overcoat layer-forming coating solution preparation step prepared using the materials;
The overcoat layer forming coating liquid is applied so as to cover the transparent substrate, the transmitted light colored layer, and the reflected light colored layer to form an overcoat layer forming layer. A layer forming step;
The overcoat layer forming layer is exposed to light using a multi-tone mask and then developed, whereby a layered portion of the colored layer for transmitted light of each color and the overcoat layer formed in the transmitted light region has The retardation in the thickness direction is uniform, and the retardation in the thickness direction of the laminated portion of the colored layer for reflected light of each color and the overcoat layer formed in the reflected light region is uniform. The overcoat layer is formed so that the thickness of the overcoat layer is different depending on the retardation in the thickness direction of the colored layer for transmitted light and the colored layer for reflected light of each color. And a process for producing a color filter for a transflective liquid crystal display device. A colored layer forming step of forming a colored layer for transmitted light of a plurality of colors in a region for transmitted light on a transparent substrate, and forming a colored layer for reflected light of a plurality of colors in the reflected light region on the transparent substrate;
An overcoat layer forming coating solution for forming an overcoat layer formed to cover the transparent substrate, the transmitted light colored layer, and the reflected light colored layer has retardation in the thickness direction. An overcoat layer-forming coating solution preparation step prepared using the materials;
The overcoat layer forming coating liquid is applied so as to cover the transparent substrate, the transmitted light colored layer, and the reflected light colored layer to form an overcoat layer forming layer. A layer forming step;
When the overcoat layer forming layer is exposed to light using a multi-tone mask and developed, the color filter for a transflective liquid crystal display device is used in a transflective liquid crystal display device. The thickness direction retardation of the color filter for the transflective liquid crystal display device, and the transflective liquid crystal display device does not have the color filter for the transflective liquid crystal display device. The thickness of the overcoat layer varies depending on the retardation in the thickness direction of the colored layer for transmitted light of each color and the colored layer for reflected light of each color so that the retardation in the thickness direction is offset. And a method for producing a color filter for a transflective liquid crystal display device, comprising: an overcoat layer forming step of forming an overcoat layer A plurality of colored light layers for design transmission light are formed in the transmission light region on the design transparent substrate, and a plurality of colors reflection light coloring layers for design are formed in the reflection light region on the design transparent substrate. Then, a measurement step of measuring the retardation in the thickness direction of the colored layer for transmitted light for design and the colored layer for reflected light for design,
Based on the result of the measurement step, the retardation in the thickness direction of the colored layer for the transmitted light for design of each color and the laminated portion of the design overcoat layer formed in the transmitted light region is uniform, and The design overcoat layer so that the thickness direction retardation of the laminated portion of the design reflected color layer for each color and the design overcoat layer formed in the reflected light region is uniform. The material having the retardation in the thickness direction used for the formation of the color is selected, and for the design according to the thickness direction retardation of the colored layer for transmitted light for each color and the colored layer for reflected light for each color of design. An overcoat layer adjusting step for determining a film thickness of the overcoat layer, and a color filter for a transflective liquid crystal display device, comprising: Method. A plurality of colored light layers for design transmission light are formed in the transmission light region on the design transparent substrate, and a plurality of colors reflection light coloring layers for design are formed in the reflection light region on the design transparent substrate. Then, a measurement step of measuring the retardation in the thickness direction of the colored layer for transmitted light for design and the colored layer for reflected light for design,
Based on the result of the measurement step, when the color filter for the transflective liquid crystal display device is used in the transflective liquid crystal display device, the color filter for the transflective liquid crystal display device is The retardation in the thickness direction having and the retardation in the thickness direction in the state where the transflective liquid crystal display device does not have the color filter for the transflective liquid crystal display device are offset. A material having a retardation in the thickness direction used for the formation of the design overcoat layer is selected, and the retardation in the thickness direction of the colored layer for transmitted light for each color and the colored layer for reflected light for design of each color is selected. And an overcoat layer adjusting step for determining the film thickness of the design overcoat layer accordingly. A method of designing a filter.   A color filter for a transflective liquid crystal display device according to claim 9, further comprising a design step using the method for designing a color filter for a transflective liquid crystal display device according to claim 11. Production method.   A color filter for a transflective liquid crystal display device according to claim 10, further comprising a design step using the design method of a color filter for a transflective liquid crystal display device according to claim 12. Production method.   A transflective liquid crystal display device comprising at least the color filter for a transflective liquid crystal display device according to any one of claims 5 to 8.

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