JPS60165602A - Color separating filter - Google Patents

Abstract

PURPOSE:To obtain a color separating filter which can control easily the color balance with each other by laminating a transparent color adjusting film for controlling the quantity of incident light color filters on a protective film for the color filters. CONSTITUTION:Photosensitive gelatin or the like is coated on a substrate and is dyed after patterning to form a Cy (cyan) filter layer 1. An intermediate reserve printing color film 2 is laminated thereon and a Ye (yellow) filter 3 is similarly formed. After a protective layer 4 is formed thereon, a transparent color adjusting film 5 is laminated on a G (green) filter 6 superposed with the Cy, Ye filter layers 1b, 3b in order to increase the lens effect of the filter 6. The quantity of the incident light of the filter 6 is increased by the lens effect of the film 5 by which the sensitivity is increased. The color separating filter which permits easy control of the color balance with each other is thus obtd.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a color separation filter consisting of minute mosaic patterns or stripes, that is, a color filter, and particularly relates to a color filter capable of good color reproducibility. .

[Prior art]

Generally, a mosaic or stripe color filter consisting of a minute pattern, which is used in solid-state image pickup devices, image pickup tubes, multicolor display devices, etc., is described in, for example, Japanese Patent Publication No. 17375/1983. manufactured in such a way. To explain this using Fig. 1, first, a photosensitive liquid made by imparting photosensitivity to a water-soluble resin such as gelatin or polyvinyl alcohol is uniformly applied onto a substrate 10 made of glass or a silicon wafer, and then dried. After forming a photosensitive film, a desired pattern is formed using photolithography technology, and this image area is colored by a dyeing method using a dye having predetermined spectral characteristics to form a Cy (cyan) filter layer. form. Subsequently, this is coated with a transparent intermediate resist dyeing film 2, a photoresist film is again formed, this is exposed and developed, and the process of coloring is repeated sequentially to obtain a colored image of a desired pattern, that is, the Ye (yellow) filter layer 3. is formed overlapping a part of the Cy filter layer 1. After that, when a transparent protective film 4 is formed on the uppermost surface, Cyy filter a, Y
A color separation filter having an ee filter a and a G (green) filter 6 consisting of an overlapping portion of both filter layers 1.3 can be created. As in the filter shown in FIG. 1, the method of forming a third color G filter 6 by overlapping two color filter layers 1 and 3, that is, Cy and Ye filter layers, is aimed at shortening the work process. It is done.

FIG. 2 shows the spectral sensitivity characteristics of the color separation filter of FIG. 1 obtained by the above steps, and G in the figure.

C)' and Ye indicate the spectral sensitivity characteristics of the filters 6, la, and 3a, respectively.

Conventional color separation filters are configured as described above, so in a two-color superimposed filter, the spectral characteristics of the third color are determined by the characteristics of the two superimposed colors, and it is difficult to control the mutual color balance. It is very difficult to roll. In addition, when a single filter is provided so that the color balance of each color can be controlled, there is a problem in that the three steps of forming an anti-dye film, filter buttering, and dyeing must be further increased.

[Summary of the invention]

This invention has been made in view of the above, and includes laminating a transparent color adjustment film for controlling the amount of light incident on the color filter on the protective film of a desired color filter whose output is desired to be increased. This makes it easy to control mutual color balance.
- The purpose is to provide color separation filters that can be rolled.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. Third
In the figure, 10 is a substrate made of glass or a silicon wafer, etc., 1 is a Cy (cyan) fill layer formed in a desired pattern on the substrate 10, and 1a is the cy filter layer 1.
The cyy filter 2 consisting of a partial pattern of
0 and the intermediate resist dyeing film which is laminated on the cy filter layer and serves as a resist dyeing film during Ye (yellow) dyeing which is a subsequent process; 3 is the other layer of the substrate 10 and the cy filter layer 1; A Ye (yellow) filter layer is formed in a desired pattern on the partial pattern lb through the intermediate resist dyeing ll12, 3a is a Ye filter consisting of a partial pattern of the Ye filter layer 3, and the Cy5Ye filter layer 1 is formed on the partial pattern lb. ,3
A G (green) filter 6 is formed by the overlapping portion, that is, the partial pattern 1b of the Cy filter layer 1 and the partial pattern 3b of the Ye filter layer 3. 4 is a protective film laminated on the intermediate resist dyeing film 2 and the Ye filter layer, and 5 is a transparent color adjustment film laminated on the protective film on the G filter 6.

Next, a method for manufacturing the filter will be described. First, photosensitive gelatin or the like is applied onto the substrate 10, a predetermined pattern is formed using photolithography, and then this is dyed to create a cy
A filter layer 1 is formed. Next, the intermediate resist dyeing film 2 is laminated,
A Ye filter layer 3 is formed in the same manner as the cy filter layer 1 described above. The process is the same as the conventional method until the protection layer 111i4 is laminated thereon. In the manufacturing method of this embodiment, after the protective film 4 is laminated, the filter is A transparent color adjustment film 5 is laminated on the film 6 using a photolithography process.

Next, the effects will be explained. In this embodiment, since the transparent color adjustment film 5 is laminated on the G filter 6, the amount of light incident on the G filter 6 increases due to its lens effect, and the sensitivity increases. Therefore, by adjusting the film thickness and/or pattern dimensions of this color adjustment film 5, the color reproducibility of the G filter 6, which is determined by the characteristics of the CY and Ye filter layers 1 and 3, can be individually and delicately controlled. can.

FIG. 4 shows the measurement results of the spectral sensitivity characteristics of G (green). In the figure, curve A is measured by laminating the conventional filter of FIG. 1 on the device, in which no color adjustment film is laminated on the G filter 6, and curve B is curve B.

Curve C is a curve A in which the color adjustment film 5 is laminated with a thickness of 1.0 μm and 2.0 μm on the protective film 4 on the G filter 6.
It was measured in the same manner.

As can be seen from the figure, by stacking the color adjustment film 5, the spectral sensitivity of the G filter 6 can be increased. Therefore, by adjusting the film thickness of the color adjustment film 5, the sensitivity can be well controlled, and other filters
You can adjust the color balance with a and 3a.

FIG. 5 shows the spectral sensitivity characteristics of a color adjustment film laminated on a G filter together with the characteristics of other filters. In the figure, the same reference numerals as in FIG. 2 indicate the same parts. Here, as can be seen by comparing FIG. 2 and FIG. 5, in this embodiment, another filter la is used.

Only the sensitivity of G (green) is increased without affecting 3a. In this way, in this embodiment, it is possible to individually control the sensitivity of the filters, which facilitates the design.

In addition, in the above embodiment, the color adjustment film was provided only on the G filter, but this may be designed on quasi-German filters such as Cy, ye, etc., or it may be designed on multiple filters. It may be installed in

〔Effect of the invention〕

As described above, according to the color separation filter of the present invention, a transparent color adjustment film for controlling the amount of light incident on the color filter is provided on the protective film of the desired color filter whose output is desired to be increased. Since they are laminated, the balance of each color can be easily controlled and good color reproducibility can be obtained.

[Brief explanation of the drawing]

Figure 1 is a diagram showing a conventional color filter, Figure 2 is a spectral response characteristic diagram of a device equipped with a conventional filter, and Figure 3 is a diagram showing a conventional color filter.
The figure shows a color filter according to an embodiment of the present invention;
FIG. 4 is a diagram showing changes in the spectral characteristics of the filter depending on the thickness of the color adjustment film, and FIG. 5 is a diagram of the spectral sensitivity characteristics of a device in which the color adjustment film is laminated on the G filter of the conventional filter. DESCRIPTION OF SYMBOLS 1... Cy (cyan) filter layer, 1a... Cy filter, 2... Intermediate resisting film, 3... Ye (yellow) filter layer, 3a... Ye filter, 4... Protection Film, 5... Color adjustment film, 6... G (green) filter. In the drawings, the same reference numerals indicate the same or equivalent parts. Agent Masuo Oiwa Fig. 2 Wavelength (nm) - Fig. 4 Wavelength (nm) - Fig. 5 Caries length (nm) -

Claims (1)

[Claims] 111 A plurality of color filters each having predetermined spectral characteristics, and a filter retainer laminated on the color filters! A color separation filter comprising: a canopy; and a transparent color adjustment film laminated on a protective film of a desired color filter among the plurality of color filters to control the amount of light incident on the color filter. (2) The plurality of color filters include a cyan filter consisting of a partial pattern of a cyan filter layer formed in a desired pattern on the substrate-F, and a transparent filter formed on the substrate and another partial pattern of the cyan filter layer. A yellow filter consisting of a partial pattern of a yellow filter layer formed in a desired pattern through an intermediate resist dyeing film, and a green filter consisting of an overlapping portion of both of the above filters are provided, and the above transparent color adjustment 2. The color separation filter according to claim 1, wherein a film is formed on the green filter.