JP2009020431A - Color filter, liquid crystal display device using the same and method of manufacturing color filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color filter which does not cause light leakage from anywhere of a colored part in the color filter having a transparent colored layer constituted with the colored parts of an even number and four or more colors, the colored part absorbing visible light of specified wavelengths; and to provide a method of manufacturing the color filter using photolithography, which does not cause light leakage from anywhere of the colored part. <P>SOLUTION: In the transparent colored layer disposed in the color filter, cross-sectional contours of transparent colored parts of four or more colors and even number constituting the transparent colored layer does not substantially incline in the one-sided direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a color filter, a liquid crystal display device using the same, and a method of manufacturing the same, and more specifically, a color filter including a transparent coloring layer composed of colored transparent colored portions of even-numbered colors of four or more colors. The present invention relates to a liquid crystal display device used and a manufacturing method thereof.

  At present, liquid crystal display devices capable of color display (color liquid crystal display devices) are widely used. On the viewer side of a general color liquid crystal display device, a color filter in which colored portions corresponding to pixels (dots) are finely patterned is provided as a display side substrate, and a liquid crystal drive substrate including a liquid crystal drive electrode is provided. A liquid crystal cell is formed by sandwiching driving liquid crystal molecules between them, and this is switched for each pixel to switch between bright display (white display) and dark display (black display). In a typical color filter, colored portions of three colors corresponding to the three primary colors of red (R), green (G), and blue (B) are repeatedly arranged side by side in stripes at each pixel width. A transparent colored layer is formed. Three pixels (dots) of R, G, and B constitute one picture element (pixel), and each picture element can perform color display by the additive color mixing method.

  In recent years, in order to express more complex colors, the above three colored portions are provided with complementary colored portions such as yellow (hereinafter also referred to as “Y”) and cyan (hereinafter also referred to as “C”). There has been proposed a color filter including a transparent colored layer constituted by the added four colored portions. For example, Patent Document 1 proposes a method for improving the color reproducibility of a color liquid crystal display device. In the above liquid crystal display device, the area of one color pixel is composed of pixel areas of four colors such as C in addition to RGB. The transparent colored layer may be patterned in two vertical and horizontal orthogonal matrix patterns or in two oblique directions in addition to repeating the stripe-shaped colored portions arranged side by side as described above.

  In addition, a color filter including four pixels obtained by adding a colorless and transparent pixel to a basic three primary colors of RGB to a colorless and transparent (hereinafter also referred to as “W”) pixel for white display has been proposed (for example, Patent Document 2 below). Patent Document 3). Since the W pixel has higher light utilization efficiency than the other pixels, the color filter in which the W pixel is added to RGB is a color filter proposed mainly for improving the luminance of white display.

  The multicolor color filter described above is generally formed by patterning a plurality of colored portions in order using a photolithography method. For example, Patent Document 2 discloses a color filter that is patterned by a photolithography process, and in addition to a pixel pattern of red, green, and blue, a white pixel is formed using a photosensitive resin that mainly includes polyamide and does not contain a pigment. A manufacturing method is disclosed. This document addresses the problem of cell gap failure that occurs when white pixels are formed after other pixels in a ferroelectric liquid crystal display panel with a narrow cell gap when manufacturing color filters using a photolithography process. When manufacturing a liquid crystal display panel having a wide cell gap such as TN or STN, the above problem does not become a problem, or the above problem is also a problem for pixels of other colors other than white pixels. There is no suggestion.

JP 2006-267541 A Japanese Patent Laid-Open No. 5-88011 JP 2006-259135 A

  However, in recent years, there has been a demand for higher luminance and higher quality of liquid crystal displays, and there is a problem of light leakage even in a liquid crystal display device using a color filter composed only of colored and transparent pixels other than white pixels. , Has come to be recognized as an issue to be improved. In particular, in order to reduce the thickness of the liquid crystal display device, when the protective layer (insulating layer in Patent Document 2) provided between the color filter and the driving liquid crystal layer is omitted, the above light leakage is prevented. The problem was remarkable.

Therefore, the present inventor has studied in detail the above-described light leakage problem of the color filter. As a result, the color filter has a transparent colored layer composed of a plurality of colored portions, but it has been found that light leakage may occur in a specific colored portion of the transparent colored layer.

  The problem of the light leakage of the specific colored portion is that when the transparent colored layer is composed of four or more colored portions, particularly when the arrangement pattern of the colored portions is striped, or there are a plurality of colored portions. In a pattern in which all colored portions are repeatedly formed in at least one direction in the form of a matrix composed of rows and columns, there is a problem in the entire transparent colored layer (that is, the entire effective display area).

Even when light leakage is not confirmed in the entire transparent colored layer, light leakage is confirmed at least in the colored portion existing at the extreme end of the transparent colored layer (that is, the critical portion of the effective display area). was there. In such a case, a solution may be considered in which only the black matrix line width in the critical portion of the effective display area is designed to be particularly large so that the area where light leakage may occur is blocked. However, for a small display such as a mobile phone, there is a demand for securing a display area as large as possible within a physically limited area, and it is not desirable to shield the critical part of the effective display area. There was a case. Of course, there are color filters that are not provided with a black matrix. In such color filters as well, light leakage in the critical portion of the effective display area may be a problem.

  The present invention has been made in view of the above-described problem of light leakage of the color filter, and includes a transparent colored layer composed of an even number and four or more colored portions capable of absorbing visible light having a specific wavelength. In the filter, there is provided a color filter in which light leakage does not occur from any of the colored portions, and a color filter manufacturing method using a photolithography method, and light leakage may occur from any of the colored portions. An object of the present invention is to provide a method for manufacturing a color filter that does not have a filter.

As a result of diligent efforts by the present inventors, it has been found that, among the colored portions constituting the transparent colored layer, a slope that is practically biased in one direction is formed in the outer shell having a vertical cross section parallel to the repeating direction. More specifically, when the cross-section outer shell of the colored portion cut by an arbitrary vertical plane parallel to the repeating direction of each colored portion is observed, any one color is used in the transparent colored layer composed of the three colored portions. In the colored portion of the transparent colored layer composed of the four colored portions, in the colored portion of one color or two colors, the cross-sectional outer shell is left and right non-contrast and is inclined substantially in one direction. It was.

When a liquid crystal display device is configured using the color filter, among the driving liquid crystal molecules constituting the driving liquid crystal layer formed directly or indirectly on the transparent colored layer, directly above the inclined outer shell. Alternatively, the liquid crystal molecules for driving located indirectly are restricted by the tilt, and there are portions where alignment failure is caused without exhibiting the desired alignment, and light leakage of the portion where the alignment failure is confirmed is confirmed. I found out that there was a problem.

  Therefore, according to the present invention, based on the above knowledge, in the transparent colored layer provided in the color filter, the cross-section outer shell of the colored transparent even-numbered colored portion of four or more colors constituting the transparent colored layer is substantially The color filter manufacturing method according to the second aspect of the present invention is basically characterized in that it is not inclined in one direction, and any of the colored portions is formed by photolithography. A basic feature is that a colored portion is formed at a position not adjacent to the colored portion, or that a further colored portion is formed in a region where a colored portion already formed at the left and right positions is present.

That is, the present invention
(1) A color filter including at least a transparent coloring layer composed of an even number and four or more colored portions capable of absorbing visible light of a specific wavelength directly or indirectly on a substrate, wherein the colored portion is It is arranged in a predetermined pattern in order with at least one direction as a repetitive direction, and the cross-section outer shell in a vertical cross section in which the colored portion is cut in the repetitive direction is not substantially inclined in one direction. Color filter, characterized by
(2) The color filter as described in (1) above, wherein the cross-section outer shell of each colored portion is substantially symmetrical
(3) The color filter according to (1) or (2) above, wherein there is a substantially flat outer shell portion from the central portion of the cross-section outer shell of each colored portion in the left-right direction,
(4) The color filter according to any one of (1) to (3) above, wherein a black matrix layer is provided on the substrate and below the transparent colored layer.
(5) Two substrates are opposed to each other, a driving liquid crystal layer is provided in a space formed between the substrates, and a voltage is applied to change the orientation of driving liquid crystal molecules filled in the driving liquid crystal layer. In the liquid crystal display device having a multilayer structure in which a layer including an electrode portion is provided and a polarizing plate is stacked outside the two substrates, the color filter according to any one of (1) to (4) above A liquid crystal display device used as a substrate for
(6) A transparent structure composed of even and four or more colored portions capable of absorbing visible light of a specific wavelength arranged in a predetermined pattern in order, with at least one direction as a repeating direction, directly or indirectly on the substrate. A method for producing a color filter having a colored layer, wherein a colored portion of one color is formed at a position selected arbitrarily in a predetermined pattern in a predetermined colored portion forming range on a substrate by a photolithography method. The colored portion formed in the first is the first, and then, in the planned colored portion formation range where the colored portion is not yet formed, the odd numbered toward the one direction of the predetermined pattern with the colored portion formed first as a reference Or forming the transparent colored layer by forming a colored portion of the second color or later at a position adjacent to the already formed two colored portions. The method of manufacturing a color filter according to any of that (1) to (4) above,
(7) The method for producing a color filter as described in (6) above, wherein the pattern in which the colored portions constituting the transparent colored layer are arranged is a stripe shape,
(8) The formation position of the first color of the colored stripe pattern is an odd number including the colored portion corresponding to the extreme end of the effective display region or the colored portion corresponding to the extreme end of the effective display region. A method for producing a color filter as described in (7) above, which is a colored part,
(9) The method for producing a color filter as described in (6) above, wherein the pattern in which the colored portions constituting the transparent colored layer are arranged is a matrix.
Is a summary.

  Hereinafter, some terms used in the present invention and the description for explaining the present invention will be explained.

  In the present invention, “substantially not inclined in one direction” specifically means that when driving liquid crystal molecules are arranged directly or indirectly above the colored portion, the driving liquid crystal molecules This means that the tilt is not shown to be biased in one direction to the extent that orientation failure occurs. As an example in which the outer shell of the cross section perpendicular to the longitudinal direction of the colored portion is not substantially inclined and inclined in one direction, it is desirable that the outer shell is flat. Even when there is an inclination, it includes the case where a flat portion is formed at the center of the width of the outer shell in the colored portion or in the vicinity thereof. More specifically, the lateral dimension of the outer shell in the colored portion is within a range of 35% on one side (70% on both sides) from the center of the width (for example, the lateral dimension when the cross-sectional outer shell of the colored portion is observed is about 100 μm to (If the predetermined interval is about 2.7 μm, it is appropriate that the predetermined interval is about 2.7 μm). Excludes only positive or negative cases. Depending on the display screen size, the horizontal dimension of the colored portion is also appropriately changed. For example, in the case of a small screen such as a mobile phone display screen, the sampling number may be small when the sampling interval is 2.7 μm. Therefore, as another indicator of the sampling interval, the range of 70% on both sides can be divided into about 20 to 40 equal parts in the width direction.

It is particularly desirable that the cross-sectional outer shell is “substantially bilaterally symmetric”. As an example of left-right symmetry, in addition to the outer shell shape in which the outer shell is flat, the outer shell shape in which the both ends rise in the cross-section outer shell of the colored portion and an upward slope is formed from the central region toward both ends. An outer shell shape in which the central region is raised and a downward slope is formed toward both ends, or a flat portion is present in the central region, and an outer shell shape in which a downward slope is formed at both ends across the flat portion, and the flat shape An example is an outer shell shape in which an upward slope is formed at both ends when the portion is calculated, and the slope to the both end portions is formed at substantially the same left and right angles.

More specifically, the "substantially bilaterally symmetrical" outer shell of the colored section in the present invention is more specifically, by measuring the color filter surface using a fine shape measuring instrument ET4000L (manufactured by Kosaka Laboratory), Can be confirmed. In the present invention, when the cross-sectional outer shell is “substantially bilaterally symmetric”, when the line width (lateral dimension when observing the cross-sectional outer shell) of one colored portion is 150 μm or less, the cross-sectional outer shell This means that the difference in height between the two ends of the sheet is 2500 mm or less. Further, when the line width of one colored portion (lateral dimension when the outer shell is observed) exceeds 150 μm, it means that the difference in height between both ends of the outer shell is 1700 mm or less.

  The colored portion that can absorb visible light having a specific wavelength means a colored and transparent colored portion, and does not include a colorless and transparent region that does not contain a pigment or the like.

The “cross-section outer shell” refers to the outline of the upper surface portion in a cross-sectional shape obtained by cutting the colored portion perpendicularly with a plane parallel to the repeating direction of each colored portion, unless otherwise specified.

  In addition, in the constituent layers constituting the optical element of the present invention, the expression method meaning the vertical direction such as “upper”, “upper”, “upper surface” or “lower”, “lower”, “lower surface”, etc. When arranged in the orientation of the lower layer, in any constituent layer, the substrate surface side is expressed as the “down” direction, and the side opposite to the substrate surface is expressed as the “up” direction.

  In the present invention, the “effective display area” means an area where transmitted light is emitted / incident and predetermined display or observation is performed. For example, when the present invention is used as an optical member in a liquid crystal panel, It means an area corresponding to an image display area in the liquid crystal panel.

  In the transparent colored layer in the color filter of the present invention, the cross-section outer shell of each colored portion constituting the transparent color layer is not substantially inclined in one direction, and therefore the color filter of the present invention is used as one substrate, for example, a liquid crystal When the display device is formed, there is no possibility that the driving liquid crystal molecules in the driving liquid crystal layer directly or indirectly facing the transparent colored layer will cause alignment defects due to the inclination of the cross-section outer shell. Therefore, in the display of the display configured using the color filter of the present invention, light leakage does not occur in each colored portion, and a high-quality liquid crystal display can be provided. In addition, since the color filter includes a transparent coloring layer composed of colored portions of four or more colors and even colors, for example, as a four-color filter, a more complicated color display can be achieved compared to a conventional three-color filter. Can be offered in quality.

  According to the color filter of the present invention, it is possible to omit the protective layer that has been conventionally provided between the transparent colored layer and the driving liquid crystal layer, or to reduce the thickness of the liquid crystal display. It can greatly contribute to thinning. More specifically, when the color filter of the present invention is used for a driving type liquid crystal display in which driving liquid crystal molecules are aligned in a direction rising from the substrate surface, such as a vertical direction, as in the TN type or MVA type. The conventional protective film can be omitted, and in the liquid crystal display of the driving method in which the driving liquid crystal is aligned in the horizontal direction as in the IPS method, the conventional protective film is 3/4 of the conventional thickness. It can be made as thin as possible.

  In addition, according to the method for producing a color filter of the present invention, a colored portion having an even number and four or more colors can be obtained without changing the number of steps and labor from the conventional method for forming a colored transparent colored layer using a photolithography method. The upper surface is inclined substantially in one direction simply by specifying the patterning position in a region where no other colored portion is present on the left or right, or a region where other colored portions are present on the left or right. No colored part can be formed.

In particular, the first color formation position of the colored stripe pattern is an odd-numbered coloring including a colored portion corresponding to the extreme end of the effective display region or a colored portion corresponding to the extreme end of the effective display region. If the color filter manufacturing method of the present invention is characterized in that it is a part of the outermost shell of the effective display area, the shape of the outer shell of the cross-sectional area is substantially reduced. Since it can be formed so as not to incline in the direction, it is particularly excellent when the critical part of the effective display area is effectively used as the display area.

Below, the color filter of this invention and its manufacturing method are demonstrated using FIG. 1 and FIG. The cross section of the colored portion described in the drawings shown for explaining the present invention is actually changed from the aspect ratio and illustrated as a schematic shape in order to explain the shape of the outer shell of the cross section. In FIG. 2, the cross-section outer shell of each colored portion is illustrated as being flat, but this does not necessarily mean that the cross-section outer shell becomes flat according to the manufacturing method of the present invention. According to the manufacturing method of the present invention, the cross-section outer shell is prevented from being inclined substantially in one direction.

FIG. 1 shows a red (hereinafter sometimes simply referred to as “R”) colored portion 3, a yellow (hereinafter sometimes simply referred to as “Y”) colored portion 4, and a green (hereinafter simply referred to as “G”). ) A top view of the transparent colored layer 8 formed by forming the colored portions 5 and the colored portions 6 of the blue color (hereinafter simply referred to as “B”) colored portions 6 into stripes of a plurality of rows and one column. It is. 2 (2E) is a cross-sectional view of the color filter 7 including the transparent colored layer 8 of FIG. 1, and is a schematic cross-sectional view when cut in the XX direction in FIG. FIGS. 2 (2A) to (2E) show a color comprising a black matrix (hereinafter also referred to as “BM”) 2 and a transparent colored layer 8 composed of four colored portions on a glass substrate 1. One mode of the manufacturing method of the present invention for creating the filter 7 is shown separately for each step.

  First, BM2 is formed on the upper surface of a suitable glass substrate 1 by orderly patterning so that the planned positions 3 of the colored portions can be defined between the BM2 (FIG. 2A). Next, the R colored portion 3 is formed by a photolithography method in accordance with the planned production position of the R colored portion (FIG. 2B). Subsequently, the Y colored portion 4 is formed in the same manner at a position that is not adjacent to the R colored portion 3 and is therefore a colored portion non-created region on both sides (FIG. 2C). That is, as shown in FIG. 2C, the second colored Y portion 4 is formed with odd colored portions in the row direction with the first colored R portion 3 as a reference (first). Formed in the planned range.

  Then, as the third colored portion, the G colored portion 5 is similarly formed between the R colored portion 3 and the Y colored portion 4 (FIG. 2D). Further, as a colored portion of four colors, a B colored portion 6 is formed by a photolithography method between the Y colored portion 4 and the R colored portion 3 in the same manner as described above to form a transparent colored layer 8, and the color filter 7 Formed (FIG. 2E). As described above, the G coloring portion 5 and the B coloring portion 6 are formed in a region sandwiched between two already formed coloring portions. In the present specification, an embodiment in which the colored portions of RGBY of four colors are formed in the order of R, Y, G, and B will be described, but the transparent colored layer in the present invention is not limited to this and is used. The design of the type of the colored part and the creation area of the colored part may be changed as appropriate. The particularly important point regarding the manufacturing method of the present invention is that the first created colored portion is first, then the second color is formed at odd-numbered positions in the row direction, and the third color is formed at further odd-numbered positions. A color plane is formed, or the third and subsequent colored portions are formed at even-numbered positions adjacent to the colored portions already formed at odd-numbered positions.

  According to the manufacturing method of the present invention illustrated in FIG. 2, when the cross section perpendicular to the longitudinal direction of the colored portion is observed in the formed color filter, the cross-section outer shell is substantially biased in one direction. As a result, there is no problem of light leakage caused by the inclination. Hereinafter, a conventional example will be described as a comparison object, and according to the manufacturing method of the present invention, a mechanism will be described in which a colored portion whose cross-section outer shell is not substantially inclined and tilted in one direction is created.

First, as a conventional example, FIG. 6 shows an example of a transparent colored layer used in a conventional color filter having a problem of light leakage. FIG. 6 is a top view of the transparent colored layer 101 composed of the three colored portions of the R colored portion 102, the G colored portion 103, and the B colored portion 104. The transparent colored layer 101 is formed by patterning the colored portions 102, 103, and 104 in the order of R, G, and B into a stripe shape of a plurality of rows and one column by a photolithography method.

  Next, in FIG. 7, a BM 114 is patterned on a glass substrate 113, a transparent colored layer 101 is laminated thereon to form a color filter 111, and then driving liquid crystal molecules 112 are vertically aligned on the upper surface. The cross-sectional schematic of a state is shown. FIG. 7 is a cross-sectional view of the color filter 111 cut in the YY direction in FIG. As shown in FIG. 7, the R colored portion 102 and the B colored portion 104 created as the first color and the third color have respective cross-sectional outer shells formed so as to cope with left and right. On the other hand, the G-colored portion 103 formed as the second color has a left side (that is, the R-colored portion side) end portion that rises high toward the paper surface, and a right-side end portion that is lower than the end portion. An inclined surface is formed in one direction from the left side to the right side.

  Then, the liquid crystal molecules for driving existing on the upper surface of the transparent colored layer 101 are controlled by the inclination in one direction observed in the cross-section outer shell of the G coloring portion 103, and around the inclined cross-section outer shell. The liquid crystal molecules for driving cause alignment failure. In the conventional transparent colored layer 101, a portion where light leakage occurs is shown by a dotted frame in FIG. 6. This light leakage portion is just a poor alignment of driving liquid crystal molecules located above the G coloring portion 103. Corresponds to the part.

  As described above, in the transparent colored layer 101 provided in the conventional color filter shown in FIG. 7, when each colored portion is formed by photolithography, in some colored portions (G colored portion in FIG. 7) The mechanism by which the cross-section outer shell can be inclined substantially in one direction is considered as follows.

The coating film formed by applying the colored resist to the substrate surface in the photolithography process is formed so as to cover the laminate already provided on the substrate surface. It is formed. Next, the film is covered with a photomask so as to have a desired patterning shape and exposed, and further, unexposed portions are washed away to form colored portions. At that time, if the exposure is performed including the area where the coating film is raised, the colored portion is completed in a shape that leaves the raised area.

  In view of the above-mentioned rising point, when looking at each colored portion in FIG. 7, the first R colored portion 102 formed first covers the BM 114 already formed on the glass substrate 113 and R A colored resist is applied to form a coating film (hereinafter also referred to as “R coating film”). Therefore, the R coating film becomes a slightly raised coating film on the BM 114. Next, exposure is performed by covering the BM 114 with a photomask so that a striped colored portion is formed on the BM 114 in the planned R colored portion formation range, and an unexposed portion is deleted to form an R colored portion. The As shown in FIG. 7, the cross-section outer shell of the R colored portion 102 formed in this way is formed in a shape in which the portion riding on the BM 114 is slightly raised to the left and right approximately equally.

  Next, regarding the G coloring portion 103 formed second, the G coloring resist is applied on the base material surface so as to cover the R coloring portion 102 and the exposed BM 114 (hereinafter referred to as “G”). Also referred to as “coating film”). ) Is formed. The G coating film swells greatly on the upper surface of the R colored portion 102, while the BM 114 has a smaller swell on the upper surface. Next, in the same manner as the method of exposing the R coating film, the G coating film is exposed to remove the unexposed portion, and a G colored portion is formed. As shown in FIG. 7, the cross-section outer shell of the G coloring portion 103 formed in this way is greatly swelled at the end portion on the R coloring portion 102 side, while the end portion on the opposite side is just as much as riding on the BM 114. As a result, a biased inclined surface that is inclined downward from the right side to the left side of the paper surface is formed.

  The B colored portion 104 formed at the end covers the already formed G colored portion 103 and R colored portion 102 and is coated with a B colored resist, so that the G colored portion 103 and the R colored portion 102 A coating film (hereinafter, also referred to as “B coating film”) that greatly rises on the upper surface is formed. Therefore, when the formation area of the B colored portion is exposed and the unexposed portion is removed to form the B colored portion, the outer shell of the cross-section becomes a shape in which the left and right ends are greatly raised.

  In the above description, as exemplified in the formation of the R colored portion 102, the G colored portion 103, and the B colored portion 104, the colored portion formed by the photolithography method is governed by the shape of the laminate already existing on the substrate surface. It is understood that the shape of the coating film made of the colored resist is determined, the unexposed portion is removed while the shape is maintained, and the shape of the colored portion that is the remaining portion is determined. Therefore, when the process of applying a colored resist to form a coating film, covering with a photomask, exposing, and removing the unexposed portion is one cycle, a transparent colored layer composed of three colored portions is formed. When trying to form from three cycles by the photolithography method, an inclination that is substantially biased in one direction is formed in the outer shell of the cross section in the second colored layer. Also, in the case of four color filters, the same problem occurs in the second and third colored layers if the colored layers are formed in order, for example, adjacent to each other. .

  On the other hand, in the manufacturing method of the present invention, the first colored portion is formed, and then the second colored portion is an odd-numbered position in the left-right direction with reference to the first formed colored portion. Or it forms in the position pinched | interposed adjacent to two already formed coloring parts. In other words, in the manufacturing method of the present invention, the colored portions formed in a plurality of rows and one column or more are not formed with other colored portions in adjacent left and right positions, or already in both left and right positions. Therefore, when a colored resist is applied to form a coating film, the swell of the coating film is substantially bilaterally symmetric with respect to the planned colored part formation position. . As a result, the cross-section of the finally formed colored portion is such that its outer shell does not substantially tilt in one direction.

  Thus, in the color filter of the present invention manufactured by the above manufacturing method, as shown in FIG. 3, when the cross-sectional shape perpendicular to the longitudinal direction of the colored portion is observed, the outer shell of the cross-section is substantially in one direction. Therefore, the orientation of the driving liquid crystal molecules arranged on the upper surface of the transparent colored layer is not disturbed by the shape of the upper surface of the transparent colored layer. Therefore, the problem of light leakage due to inclination does not occur.

As described above, a color filter including a transparent colored layer composed of four or more colored transparent colored portions of the present invention can be easily formed by the production method of the present invention. However, the manufacturing method of the color filter of the present invention including the transparent colored layer whose cross-section outer shell is not substantially inclined in one direction is not limited to the manufacturing method of the present invention. Moreover, according to the manufacturing method of the present invention, the present invention is not limited to the case of forming a transparent colored layer composed of four or more even-colored colored portions, and transparent coloring composed of three colored transparent colored portions. It can also be used for the production of color filters with layers. However, when a transparent colored layer comprising three colored transparent colored portions is prepared according to the production method of the present invention, this is regarded as pseudo six colors, and two cycles of steps are required for each colored colored portion. Therefore, attention should be paid to increasing the number of conventional processes.

  In the above description, the color filter of the present invention in which the colored portions are sequentially arranged in the row direction using the transparent colored layer in which the colored portions are patterned in a stripe shape of a plurality of rows and one column has been described. The pattern of the transparent colored layer is not limited to this, and other patterns, for example, a pattern in which the colored portions are arranged in a matrix in two vertical and horizontal orthogonal directions, or a pattern in which the colored portions are arranged in two oblique directions There may be.

  In addition, when BM is provided in a color filter, one coloring part is formed between adjacent BMs, and the bottom part of two adjacent coloring parts is formed on one BM upper surface. Is common. This is because when the color filter is used for a liquid crystal cell or the like, the BM region is a light shielding region, and the BM is an opening region, so that the specified colored portion exists without a gap in the opening region. There is a need. Therefore, it is common that the skirt portion of the colored portion is formed on the BM.

  Here, the configuration of two adjacent colored portions that run on the BM can be roughly classified as follows. That is, (1) they are not in contact with each other on the BM, (2) they are in contact with each other on the BM, and (3) one is on the other on the BM. be able to. In particular, when patterning a colored portion in a photolithography method, a colored portion that has been formed on the other colored portion is covered with a colored portion that has been formed on the other colored portion. Since this is applied and exposed to remove the excess part, before exposure, one side must be on top of the other, and in recent years the BM line width has been reduced to enlarge the opening area. Since there exists a tendency to form, it can be said that the relationship of said (3) is substantial.

When the transparent coloring layer satisfying the above relationship (3) is carried out and the production method of the present invention is carried out, for example, as shown in FIG. Since the other colored portions are formed in an unformed state, they do not run on the adjacent colored portion on the BM, while the G colored portion and the B colored portion formed between the R colored portion and the Y colored portion. Is formed on the hems of the already formed R colored part and Y colored part.
In other words, in the transparent colored layer formed by the photolithography method, the first colored portion is positioned evenly at the hem of the odd colored portion when the first colored portion is positioned first. The transparent colored layer in a relationship in which the hem of the colored portion is on the surface is shown in the manufacturing method of the present invention. The colored portion formed first is the first colored portion, and then in the planned colored portion formation range where the colored portion is not yet formed, the predetermined pattern of the predetermined pattern is formed on the basis of the first formed colored portion. By forming the transparent colored layer by forming the second and subsequent colored portions at odd positions in the row direction toward one direction or at positions adjacent to two already formed colored portions. It can be said that those formed.

  The above description does not mean that all the transparent colored layers in the color filter produced by the production method of the present invention have the relationship (3). Even if it is a transparent colored layer manufactured in the order of creation of the colored layer shown in the manufacturing method of the present invention, the transparent colored layer having the relationship (1) or (2) is prepared by adjusting the exposure method. Is possible. On the other hand, it is difficult to produce the transparent colored layer having the relationship of (3) above unless it is produced in the production order of the colored portions shown in the production method of the present invention.

  Hereinafter, the constituent layers of the color filter of the present invention will be described in more detail.

(About the board)
The substrate used in the present invention is preferably configured so as to be optically isotropic, and a glass substrate, a film having light transmissivity such as a film can be arbitrarily used. In particular, when the color filter of the present invention is used for a liquid crystal display, the substrate forming material is preferably alkali-free glass. The thickness of the substrate is, for example, about 5 μm to 3 mm depending on the application.

(About black matrix)
In the color filter of the present invention, when forming the BM, for example, a metal thin film having a light shielding property or a light absorbing property, such as a metal chromium thin film or a tungsten thin film, is formed on a substrate in a rectangular lattice shape or a stripe shape. Alternatively, it can be formed by patterning in a triangular lattice pattern or the like. Moreover, it is also possible to form by printing an organic material such as a black resin in a predetermined shape by a transfer method or the like.

  In the present invention, formation of BM is optional. However, even if alignment failure occurs in the critical region between the colored portions due to the presence of BM, the transmitted light that attempts to pass through the alignment failure region is shielded within the BM region in plan view. Therefore, the area where the problem of light leakage appears on the display panel can be reduced.

  The manufacturing method example of BM will be described in more detail. After the prepared black matrix material is washed on the glass substrate according to a conventional method, it is applied to a thickness of 3.0 μm by spin coating, at 90 ° C. for 3 minutes. Pre-baking, exposing a predetermined pattern (100 mJ / cm 2), spray development using 0.05% KOH aqueous solution for 60 seconds, followed by post-baking at 200 ° C. for 30 minutes to produce a black matrix substrate. it can. Further, the black matrix forming step may be performed by etching a substrate on which metal chromium or the like is vapor-deposited on a transparent substrate in advance. In the present invention, the BM formation method is not limited to the above, and whether or not the BM is provided in the present invention is arbitrary.

(About coloring part)
The colored portion in the present invention has a predetermined pattern by a photolithography method, directly or indirectly on a substrate, using a colored resist that transmits light of each color wavelength band for each of red, green, blue, yellow, and the like. Arranged and formed. As the arrangement form (patterning) of the colored portions, various arrangement patterns such as a stripe type, a mosaic type, and a triangle type can be selected. Hereinafter, the red, blue, green, and yellow colored portions will be described. However, in the present invention, a colored transparent colored portion other than these can be appropriately selected and formed. The colored portion is partitioned into pixel units constituting a picture element due to the presence of a black matrix or the like.

<Red colored part>
Although the thickness of the red coating film formed as the red colored portion is different depending on the required color reproducibility and the composition of the red colored portion to be laminated, in general, the film thickness of the red colored portion is It is preferably in the range of 1 μm to 3 μm, and particularly preferably in the range of 1 μm to 2 μm. When the film thickness is thicker than the above range, for example, curing by photolithography method, patterning does not work, fine irregularities occur on the colored portion surface, or the shape becomes an inversely tapered shape, which is not preferable. If it is thinner than the range, it is difficult to obtain the required high color purity, which is not preferable.

The red colored portion formed in the present invention is generally composed of a red pigment, a yellow pigment, a binder, a dispersant, and other additives. Although the kind of binder changes with the manufacturing method of a red colored part, in this invention, it is preferable on the property of invention that a red colored part is formed by photolithography methods, such as a pigment dispersion method. Therefore, in the present invention, a UV curable resin is used as the binder resin.

As the red pigment, a red pigment generally used for a color filter can be used. Specifically, CI Pigment Red 9, CI Pigment Red 97, CI Pigment Red 122, CI Pigment Red 123, CI Pigment Red 149, CI Pigment Red 168, CI Pigment Red 177, CI Pigment Red 180, CI Pigment Red 192, CI Pigment Red 215, CI Pigment Red 216, CI Pigment Red v217, CI Pigment Red 220, CI Pigment Red 223, CI Pigment Red 223 224, CI Pigment Red 226, CI Pigment Red 227, CI Pigment Red 228, CI Pigment Red 240, Pigment Red 254, CI Pigment Red 48: 1, CI Pigment Orange 5, CI Pigment Orange 13, CI Pigment Orange 17, CI Pigment Orange 31, CI Pigment Orange 36, CI Pigment Oren 38, CI Pigment Orange 40, CI Pigment Orange 42, CI Pigment Orange 43, CI Pigment Orange 51, CI Pigment Orange 55, CI Pigment Orange 59, CI Pigment Orange 61, CI Pigment Orange 64, CI Pigment Orange 65, CI Pigment Orange One or more of 71 may be used in combination.
Among these, CI Pigment Red 177 and CI Pigment Red 254 are preferable, and CI Pigment Red 177 and CI Pigment Red 254 are preferably combined.

As the yellow pigment, a yellow pigment generally used for a color filter can be used. Specifically, CI Pigment Yellow 20, CI Pigment Yellow 24, CI Pigment Yellow 83, CI Pigment Yellow 86, CI Pigment Yellow 93, CI Pigment Yellow 109, CI Pigment Yellow 110, CI Pigment Yellow 117, CI Pigment Yellow 125, CI Pigment Yellow 137, CI Pigment Yellow 138, CI Pigment Yellow 139, CI Pigment Yellow 185, CI Pigment Yellow 147, CI Pigment Yellow 148, CI Pigment Yellow 150, CI Pigment Yellow 153, CI Pigment Yellow, CI Pigment Yellow 154, CI Pigment Yellow 166, CI Pigment Yellow 168, particularly preferably CI Pigment Yellow 83, CI Pigment Yellow 138, CI Pigment Yellow 139, C.I. Pigment Yellow 150.

In addition, the said pigment may use what was surface-treated, such as a rosin process, an acidic group process, a basic process, and a pigment derivative process, as needed. Further, as a dispersant necessary for dispersing the pigment, styrene / butyl styrene copolymer, long-chain polyaminoamide phosphate, polyamide, high molecular weight polycarboxylate, oleylamine acetate, tetraalkylammonium salt, oleic acid Sodium, oleic acid amino oleate, phosphate ester salt, alkylbenzene sulfonate, etc. can be mentioned. Such a dispersant can be contained in the range of 30 to 100 parts by weight with respect to 100 parts by weight of the pigment.

As the binder resin used together with such a red pigment and a yellow pigment, for example, a UV curable resin is used. As the UV curable resin, examples of the binder resin component include monomers having an acidic group such as (meth) acrylic acid, maleic anhydride, styrenesulfonic acid, styrene, α-methylstyrene, ethyl (meth) acrylate. And a copolymer obtained by copolymerizing a monomer such as (meth) acrylamide.

Moreover, you may add a photoinitiator as another additive, Specifically, a halomethylated triazine derivative, a halomethylated oxadiazole derivative, an imidazole derivative, a benzophenone derivative etc. are mentioned. These photopolymerization initiators are compounds capable of generating radicals that polymerize a polymerizable group of a photopolymerizable monomer with ultraviolet rays, and are used alone or in combination.
Furthermore, examples of the photopolymerizable monomer include isobutyl acrylate, t-butyl acrylate, stearyl acrylate, 2-methoxyethyl acrylate, and 3-methoxybutyl acrylate.

Specific examples of the solvent used for the coating for forming a red colored portion include diisopropyl ether, n-pentane, diethyl ether, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, methyl 3-ethoxypropionate, diglyme, An organic solvent such as butyl carbitol is exemplified.

In addition, various additives can be added to the red colored portion of the present embodiment as necessary, for example, a sensitizer, a coatability improver, a development improver, a crosslinking agent, a polymerization inhibitor, You may contain a plasticizer, a flame retardant, etc. In addition, about the addition of the various additives added to the said pigment, it is the same also about the other pigment mentioned later.

<Green coloring part>
Although the thickness of the green coating formed as the green colored portion is different depending on the required color reproducibility and the composition of the green colored portion to be laminated, in general, the thickness of the green colored portion is Usually, it is in the range of 1 μm to 3 μm, preferably in the range of 1 μm to 2 μm. The reason for this range is the same as the reason for the red colored portion, and a description thereof will be omitted here.

The green colored portion formed in the present invention is formed by applying a green colored portion forming paint, drying, pattern exposure and developing, like the above layer. The colored portion-forming paint is mainly composed of a binder resin such as a green pigment, a yellow pigment, and a UV curable resin, and a solvent.

As the green pigment, a green pigment generally used for a color filter can be used. Specifically, CI pigment green 7, CI pigment green 36, CI pigment green 47 are particularly preferable as the green pigment. Green 36 is listed.

Further, since the yellow pigment, binder resin, paint solvent, and other additives to be added are the same as those described in the above layer, the description thereof is omitted here.

<Blue coloring part>
Although the thickness of the green coating film formed as the blue colored portion differs depending on the required color reproducibility and the composition of the green colored portion to be laminated, generally, the film thickness of the green colored portion is Usually, it is in the range of 1 μm to 3 μm, preferably in the range of 1 μm to 2 μm. The reason for this range is the same as the reason for the red colored portion, and a description thereof will be omitted here.

  As the blue pigment, a blue pigment generally used for a color filter can be used. Specifically, as a blue pigment, a blue pigment generally used for a color filter can be used. CI pigment blue 15 (CI pigment blue 15: 1, CI pigment blue 15: 2, CI pigment blue 15: 3, CI pigment blue 15: 4, CI pigment blue 15: 5, CI pigment blue 15 : 6), CI pigment blue 21, CI pigment blue 22, CI pigment blue 60, CI pigment blue 64, particularly preferably CI pigment blue 15: 6.

Further, a purple pigment may be added to the blue colored portion in order to adjust the color tone. Specific examples of such purple pigments include CI pigment violet 19, CI pigment violet 23, CI pigment violet 29, CI pigment violet 32, CI pigment violet 33, CI pigment violet 36 and CI pigment violet 37. CI pigment violet 38, CI pigment violet 40, CI pigment violet 50, and CI pigment violet 23 are particularly preferable.
Further, the binder resin, the solvent for paint, and other additives to be added are the same as those described in the above layer, and thus the description thereof is omitted here.

<Yellow coloring part>
The film thickness of the yellow coating film formed as the yellow colored part is different depending on the required color reproducibility and the composition of the yellow colored part to be laminated, but in the present invention, the film thickness of the yellow colored part is Usually, it is in the range of 1 μm to 3 μm, preferably in the range of 1 μm to 2 μm. The reason for this range is the same as that for the other colored portions, and a description thereof is omitted here.

The yellow colored portion used in the present invention is formed by applying a paint for forming a yellow colored portion, drying, pattern exposure, and developing in the same manner as the above layer. The part-forming paint is mainly composed of a yellow pigment, a binder resin such as a UV curable resin, and a solvent. Since the yellow pigment, binder resin, paint solvent, and other additives to be added are the same as those described in the above layer, description thereof is omitted here.

<Others>
Cyan or magenta is known as a colored resist that constitutes a colored transparent colored portion other than red, green, blue, and yellow. As described above, other known colored portion resists can be appropriately used for constituting the colored portion in the present invention.

(About other constituent layers)
In the above description, the BM and the transparent colored layer formed directly or indirectly on the substrate have been described. However, the color filter of the present invention may further optionally include other layers. For example, a so-called in-cell retardation layer in which a crosslinkable liquid crystal material is aligned and fixed in a desired direction can be formed between the substrate and the transparent colored layer.

  As another aspect, a transparent electrode layer can be formed on the upper surface of the transparent colored layer, and / or various alignment films for aligning driving liquid crystal molecules in a desired direction can be provided. The transparent electrode layer can be formed by coating a transparent electrode material made of, for example, incidium and tin by a sputtering method or the like. Moreover, as an example of the formation of the alignment film, a polyimide resin paint is applied and dried to cover the transparent colored layer or the transparent electrode layer formed thereon, and a coating film having a film thickness of about 0.07 μm is provided. The coating film surface can be formed by rubbing alignment treatment.

(About full-color liquid crystal display devices)
A liquid crystal display device 51 using the color filter 7 of the present invention will be described with reference to FIG.
FIG. 5 is a schematic cross-sectional view of a liquid crystal display device 51 including the color filter 7 of the present invention. As the liquid crystal display device 51, a so-called IPS driving method is exemplified, but other driving methods such as an MVA driving method and an OCB driving method may be used.

In the liquid crystal display device 51, the color filter 7 is incorporated as a substrate on one side as shown in FIG. 2E on the viewer side (upper side in FIG. 5) facing the viewer. However, the color filter 7 is further provided with an alignment film 14 for aligning liquid crystal molecules in a desired direction on the upper surface (driving liquid crystal layer side).
On the other hand, a liquid crystal driving substrate 71 in which a liquid crystal driving circuit 78 and a liquid crystal driving electrode 79 whose applied voltage is controlled thereby is provided on the driving liquid crystal layer 22 side is disposed on a backlight (not shown) side far from the observer. Has been. The liquid crystal drive electrode 79 is formed in a comb-like pattern for each pixel defined by the BM2.

  The driving liquid crystal layer 22 including the driving liquid crystal molecules 21 is enclosed in a sealed space surrounded by the alignment film 14, the liquid crystal driving substrate 71 and the seal 18, and is applied by an applied voltage applied from the liquid crystal driving electrode 79 in the in-panel direction. The driving liquid crystal molecules 21 are switching driven. In order to secure a space for the driving liquid crystal layer 22, a plurality of columnar bodies are generally formed between the color filter 7 and the liquid crystal driving substrate 71, but this is not shown in FIG. To do. Further, a protective film is provided between the color filter 7 and the alignment film 14, but this is not shown in FIG.

  The liquid crystal display 51 includes a linear polarizing plate 81, a retardation film 82 having an optical compensation function as a positive A plate, an alignment film 14, a driving liquid crystal layer 22, a liquid crystal driving substrate 71, and a linear polarizing plate in order from the viewer side. 83 and a backlight are arranged, and bright display and dark display are performed by controlling transmission or blocking of the backlight light for each picture element. Note that the linearly polarizing plate 81 and the linearly polarizing plate 83 are disposed so that the transmission axis directions are orthogonal to each other.

  Like the liquid crystal display device 51, according to the liquid crystal display device using the color filter of the present invention, the colored portions of four or more colors that are colored and transparent can display more complex colors in full color display, and Therefore, it is possible to display a high-quality image without light leakage.

(Board adjustment)
A glass substrate (7059 glass manufactured by Corning Co., Ltd.) as a base material subjected to the cleaning treatment and a photoresist for colored portions of four colors of BM and red, green, blue and yellow were prepared. And the photoresist for coloring part was apply | coated for each color as shown below on the glass substrate upper surface, and the transparent colored layer was laminated | stacked and formed on the base material. The composition of each photoresist will be described later.

(Coloring material adjustment)
A pigment-dispersed photoresist was used as a coloring material for BM and each colored portion. The pigment-dispersed photoresist uses a pigment as a coloring material, adds beads to a dispersion composition (containing a pigment, a dispersant, and a solvent), disperses them with a disperser for 3 hours, and then removes the beads. And a clear resist composition (polymer, monomer, additive, disclosure agent and solvent). Its composition is shown below. A paint shaker was used as the disperser.

(Create BM)
First, the BM photoresist prepared above is applied to a glass substrate by spin coating, pre-baked (pre-baked) at 90 ° C. for 3 minutes, and exposed using a mask formed in a predetermined pattern ( 100 mJ / cm ² ), followed by spray development using a 0.05% KOH aqueous solution for 60 seconds, followed by post-baking (baking) at 200 ° C. for 30 minutes to form a BM having a thickness of 1.2 μm A base material (BM forming base material) was produced.

(Create transparent colored layer)
On the BM forming substrate, a pattern is designed so that a line having a width of 200 μm and a length of 4 cm becomes 100 rows × 1 column, and colored portions are repeatedly formed in order of red, green, yellow, and blue from the end. Each colored part was created as follows. It should be noted that, in relation to the BM, the design was made so that both ends of the above-mentioned line exist at positions where the BM is lifted.
First, a red (R) pigment-dispersed photoresist is applied onto the surface of the BM-forming substrate by spin coating, prebaked at 80 ° C. for 3 minutes, and then the position corresponding to the red colored portion (effective For a stripe pattern that is patterned so that a red colored portion is formed on the 4n-3rd line (where n is an integer greater than or equal to 1. The same shall apply hereinafter) with the first end of the display area as the first. UV exposure (300 mJ / cm ² ) was performed using a photomask, followed by spray development using a 0.1% KOH aqueous solution for 60 seconds, followed by post-baking (baking) at 200 ° C. for 60 minutes, and a BM pattern In contrast, a pattern of a red (R) colored portion having a film thickness of 2.6 μm was formed at a predetermined position.

Subsequently, using a method similar to the method for forming the pattern of the red (R) colored portion, except that a patterned photomask on which the colored portion is formed is used 4n-1th, yellow (Y) coloring A department was created.
Thereafter, using a method similar to the method for forming the pattern of the red (R) colored portion except that a patterned photomask on which the colored portion is formed is used 4n-2nd, the green (G) colored portion It was created.
Finally, the blue (B) colored portion is created using the same method as the pattern forming method for the red (R) colored portion except that a patterned photomask on which the colored portion is formed is used 4nth. did.
In this way, a color filter in which a transparent colored layer constituted by repeatedly arranging BM and a red colored portion, a green colored portion, a yellow colored portion, and a blue colored portion in this order on a glass substrate was prepared. Was taken as Example 1.

<Photoresist for black matrix>
Black pigment: 14.0 parts by weight (TM Black # 95550 manufactured by Dainichi Seika Kogyo Co., Ltd.)
・ Dispersant: 1.2 parts by weight (Disperbyk 111 manufactured by Big Chemie Co., Ltd.)
・ Polymer 2.8 parts by weight (VR60 manufactured by Showa Polymer Co., Ltd.)
・ Monomer: 3.5 parts by weight (SR399, manufactured by Sartomer)
・ Additive: 0.7 parts by weight (L-20 manufactured by Soken Chemical Co., Ltd.)
Initiator: 1.6 parts by weight (2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1)
・ Initiator: 0.3 parts by weight (4,4'-diethylaminobenzophenone)
・ Initiator: 0.1 parts by weight (2,4-diethylthioxanthone)
・ Solvent: 75.8 parts by weight (ethylene glycol monobutyl ether)

<Red (R) colored portion photoresist>
・ Red pigment: 4.8 parts by weight (CIPR254 (Chromophthal DPP Red BP manufactured by Ciba Specialty Chemicals))
・ Yellow pigment: 1.2 parts by weight (CI PY139 (PASFOL Yellow D1819 manufactured by BASF))
・ Dispersant: 3.0 parts by weight (Solsparse 24000 manufactured by Zeneca)
-Monomer: 4.0 parts by weight (SR399 manufactured by Sartomer Co., Ltd.)
-Polymer 1 ... 5.0 parts by weight-Initiator ... 1.4 parts by weight (Irgacure 907 manufactured by Ciba Geigy)
・ Initiator: 0.6 parts by weight (2,2′-bis (o-chlorophenyl) -4,5,4 ′, 5′-tetraphenyl-1,2′-biimidazole)
・ Solvent: 80.0 parts by weight (propylene glycol monomethyl ether acetate)

<Green (G) Colored photoresist>
Green pigment: 3.7 parts by weight (CI PG7 (Seika Fast Green 5316P manufactured by Dainichi Seika))
・ Yellow pigment: 2.3 parts by weight (CI PY139 (PASFOL Yellow D1819 manufactured by BASF))
・ Dispersant: 3.0 parts by weight (Solsparse 24000 manufactured by Zeneca)
-Monomer: 4.0 parts by weight (SR399 manufactured by Sartomer Co., Ltd.)
-Polymer 1 ... 5.0 parts by weight-Initiator ... 1.4 parts by weight (Irgacure 907 manufactured by Ciba Geigy)
・ Initiator: 0.6 parts by weight (2,2′-bis (o-chlorophenyl) -4,5,4 ′, 5′-tetraphenyl-1,2′-biimidazole)
・ Solvent: 80.0 parts by weight (propylene glycol monomethyl ether acetate)

<Blue (B) Colored photoresist>
Blue pigment: 4.6 parts by weight (CI PB15: 6 (BASF Heliogen Blue L6700F))
・ Purple pigment: 1.4 parts by weight (CI PV23 (Clariant Foster Palm RL-NF))
・ Pigment derivative: 0.6 parts by weight (Solsperse 12000 manufactured by Zeneca)
・ Dispersant: 2.4 parts by weight (Solsparse 24000 manufactured by Zeneca Corporation)
-Monomer: 4.0 parts by weight (SR399 manufactured by Sartomer Co., Ltd.)
-Polymer 1 ... 5.0 parts by weight-Initiator ... 1.4 parts by weight (Irgacure 907 manufactured by Ciba Geigy)
・ Initiator: 0.6 parts by weight (2,2′-bis (o-chlorophenyl) -4,5,4 ′, 5′-tetraphenyl-1,2′-biimidazole)
・ Solvent: 80.0 parts by weight (propylene glycol monomethyl ether acetate)

<Yellow (Y) Colored photoresist>
・ Yellow pigment: 6.0 parts by weight (CI PY139 (PASFOL Yellow D1819 manufactured by BASF))
・ Dispersant: 3.0 parts by weight (Solsparse 24000 manufactured by Zeneca)
-Monomer: 4.0 parts by weight (SR399 manufactured by Sartomer Co., Ltd.)
-Polymer 1 ... 5.0 parts by weight-Initiator ... 1.4 parts by weight (Irgacure 907 manufactured by Ciba Geigy)
・ Initiator: 0.6 parts by weight (2,2′-bis (o-chlorophenyl) -4,5,4 ′, 5′-tetraphenyl-1,2′-biimidazole)
・ Solvent: 80.0 parts by weight (propylene glycol monomethyl ether acetate)

  In addition, the polymer 1 described in this specification is a copolymer 100 of benzyl methacrylate: styrene: acrylic acid: 2-hydroxyethyl methacrylate = 15.6: 37.0: 30.5: 16.9 (molar ratio). 2-Methacryloyloxyethyl isocyanate is added 16.9 mol% with respect to mol%, and the weight average molecular weight is 42500.

(Comparative example)
After the red colored portion is formed 4n-3, the blue colored portion is formed using a patterned photomask in which the colored portion is formed 4n-2, and then the colored portion is formed 4n-1 Example 1 except that a green colored portion is formed using a patterned photomask and a yellow colored portion is formed using a patterned photomask in which the colored portion is finally formed 4nth. A color filter was prepared and used as Comparative Example 1.

(Evaluation) Light Leakage Evaluation In order to evaluate the performance of whether or not light leakage is prevented when a color filter is used in a liquid crystal display, a liquid crystal cell was produced using the color filter of Example 1 as a substrate on one side. . Specifically, using a solution obtained by diluting JALS-2021-R2 with γ-butyrolactone to 50% as a vertical alignment film solution, flexographic printing is performed on the upper surface of the color filter and the base glass (the same substrate as the color filter). By patterning by the method, a film having a thickness of 600 mm was formed, and baked at 180 ° C. for 1 hour, so that two substrates having a vertical alignment film formed on the surface were manufactured. And the liquid crystal cell for a measurement was produced by making the board | substrate with which the said color filter was formed, and the said raw glass substrate faced so that an orientation film might face. The distance between the opposing substrates was set to 5 μm, and the gap between both substrates was sealed with a sealing member. Next, liquid crystal (MLC-6846-000 manufactured by Merck Japan Co., Ltd.) is injected into the space formed by the space between both substrates and the sealing member, and the injection port is sealed to obtain a liquid crystal cell sample for measurement as Example 2. did.

  Using Example 2 prepared as described above, the presence or absence of light leakage was confirmed as follows. First, the polarizing microscope CPX31-P manufactured by Olympus Co., Ltd. was set in a crossed Nicol state, light was applied with the liquid crystal cell of Example 2 sandwiched between the polarizing plates, the substrate was rotated in this state, and there was no light leakage Was observed with the naked eye. As a result, no light leakage was observed in the entire effective display area of Example 2.

For Comparative Example 1, a liquid crystal cell was prepared in the same manner as in Example 2 to obtain Comparative Example 2. In Comparative Example 2, light leakage evaluation was performed in the same manner as in Example 1. As a result, in Comparative Example 2, light leakage was partially confirmed in the light leakage evaluation. When the partial light leakage was observed with a polarizing microscope, it was confirmed in the second color created in the order of red, green, yellow, and blue, and the yellow color created in the third.

When the cut surface obtained by cutting the substrate in the direction in which each colored portion is arranged in the stripe pattern is observed, the green and yellow colored portions in the sample of Comparative Example 2 have already created colored portions on the left and right sides. However, it was created at a position where no other colored portion was present on the other side. This creation position corresponds to the position where the green colored portion described with reference to FIGS. 6 and 7 described above is created. In this way, in an environment in which a colored portion already exists only on one of the left and right sides, the green colored portion or the green colored portion to be created next is greatly raised on one side due to this already existing colored portion. As a result, it is understood that the outer shell has a shape inclined in one direction.

  On the other hand, in Example 1, the colored portions arranged in order of red, green, yellow, and blue are created in the order of red, yellow, green, and blue. That is, when observed on the cut surface of the substrate, any colored portion is created at a position where no other colored portion exists on both the left and right sides, or another colored portion already exists on the left and right sides. As a result, only one side of the cross section of the colored portion is greatly raised, and the outer shell of the cross section is not inclined in one direction. Therefore, the evaluation result was obtained that the crosslinkable liquid crystal material applied above the color filter of Example 1 was well aligned in a desired direction without being disturbed and no light leakage occurred.

It is a top view of the transparent colored layer in the color filter of this invention. 2A to 2E are schematic side views of the substrate in each step for explaining the steps of the color filter manufacturing method of the present invention. It is the cross-sectional schematic of the color filter of this invention. It is the cross-sectional schematic of the color filter of this invention. 1 is a schematic cross-sectional view of a liquid crystal display device of the present invention. It is a top view of the transparent colored layer in the conventional color filter. It is a cross-sectional schematic diagram of a conventional color filter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Glass substrate 2 Black matrix 3 Red colored part 4 Yellow colored part 5 Green colored part 6 Blue colored part 7 Color filter 8 Transparent colored layer 14 Alignment film 21 Driving liquid crystal molecule 22 Driving liquid crystal layer

Claims (9)

A color filter comprising at least a transparent colored layer composed of even and four or more colored portions capable of absorbing visible light of a specific wavelength directly or indirectly on a substrate,
The colored portions are arranged in a predetermined pattern in order with at least one direction as a repeating direction, and a cross-sectional outer shell in a vertical section in which the colored portions are cut in the repeating direction is substantially biased in one direction. A color filter characterized by being not inclined. The color filter according to claim 1, wherein the outer shells of the colored portions are substantially symmetrical. 3. The color filter according to claim 1, wherein there is a substantially flat outer shell portion from the center portion of the cross-section outer shell of each colored portion in the left-right direction. The color filter according to any one of claims 1 to 3, wherein a black matrix layer is provided on the substrate and below the transparent colored layer. From the electrode part which faces two substrates, provides a driving liquid crystal layer in a space formed between the substrates, and changes the orientation of driving liquid crystal molecules filled in the driving liquid crystal layer by applying a voltage. The color filter according to any one of claims 1 to 4 is used as one substrate in a liquid crystal display device having a multilayer structure in which a layer is formed and a polarizing plate is laminated outside the two substrates. A liquid crystal display device characterized by the above. A transparent colored layer composed of even and four or more colored portions capable of absorbing visible light of a specific wavelength, which is arranged in a predetermined pattern in order, with at least one direction as a repeating direction, directly or indirectly on a substrate A color filter having a predetermined color pattern is formed in a predetermined pattern in a predetermined area on the substrate by a photolithography method, and is formed at the beginning. The colored portion is the first, and then, in the planned colored portion formation range in which the colored portion is not yet formed, the odd-numbered position or the odd-numbered position in one direction of the predetermined pattern with reference to the colored portion formed first The transparent colored layer is formed by forming a colored portion for the second and subsequent colors at a position adjacent to two already formed colored portions. Color production method of filter according to any one of claim 1 to 4. The method for producing a color filter according to claim 6, wherein a pattern in which the colored portions constituting the transparent colored layer are arranged is in a stripe shape. The formation position of the first color of the colored striped pattern is a colored portion corresponding to the extreme end of the effective display region, or an odd number of colored portions including the colored portion corresponding to the extreme end of the effective display region. The method for producing a color filter according to claim 7, wherein: The method for producing a color filter according to claim 6, wherein the pattern in which the colored portions constituting the transparent colored layer are arranged is a matrix.

Images