JPS61198666A - Solid-state image pickup device - Google Patents

Abstract

PURPOSE:To obtain color filters having the characteristic of arbitrary spectro- sensitivity and solid-state image pickup elements with improved resolution and sensitivity by a method wherein a picture element has a plurality of picture elements having two kinds of color regions of accurate area ratio. CONSTITUTION:A color filter 1 has the lengthwise and crosswise arrangement of picture elements where color regions made of colored dyed layers have been formed, and isolation regions 3 not dyed are formed among them. Part 2a, 2b, and 2c of picture elements 2 are formed out of two kinds of color regions. In the picture element 2a made of an R region and a W region, the full outer periphery is surrounded by the R region. In other words, the W region only has to be formed in the R region with a fixed area, and its position does not particularly have to be prescribed. The R and W regions can easily form two kinds of color regions with good accuracy at an arbitrary area ratio. The amount of light increases by providing the R region with the W region, and color signals of B, G, R in oblique lines in addition to R signals can be obtained at a sensitivity proportion to the area of the W region, and the color filter improved in sensitivity and resolution can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a solid-state image sensor having a color filter for color separation.

[Conventional technology]

C0D-? One or two solid-state image sensors such as MO8
In a color camera constructed using a single color filter, a screen-like or stripe-like color filter is used for color separation.

Color filters are generally formed by using a dyed layer of an organic thin film such as gelatin on a transparent substrate such as glass or a solid-state image sensor, and are used by aligning each pixel with the photosensitive area of the solid-state image sensor.

As a color filter, each pixel is colored red (fL), f(B
), consisting of the primary colors of green (G), or cyan (Cy), yellow (Ye), magenta (Mg) and white (W)
However, in order to improve color resolution and spectral sensitivity, a plurality of pixels from which two or more types of color signals can be obtained from one pixel may be formed and used.

[Problem that the invention seeks to solve]

Color filter io! As a method for obtaining color signals of two or more classes from element j, for example, as shown in Figure 6,
#jJ element 2 is divided into two and the color area of 2fli class 21.2
2 (division method), and a method of reducing the density of the dyed layer of the entire pixel and mixing W as a result (dilution method).

However, in the one-division method, it is necessary to align the dyeing masks, and the error is large, so it is difficult to form two color regions with accurate area ratios. That is, if the area ratio is off by 1 to 2 inches, the color will be different and uniform pixels with good reproducibility cannot be obtained, which is a drawback.

Furthermore, in the dilution method, the concentration of the dyed layer is determined by the concentration of the dye solution used, dyeing time, temperature, etc., and therefore has the drawback of large variations and poor reproducibility.

[Purpose of the invention]

An object of the present invention is to provide a color filter that has a plurality of pixels having at least two types of color regions with accurate area ratios in one pixel and can easily obtain arbitrary spectral sensitivity characteristics. be.

Still another object of the present invention is to provide a solid-state imaging device that is equipped with a color filter having arbitrary spectral sensitivity characteristics and has improved resolution and sensitivity.

[Means for solving problems]

The color filter of the present invention is a color filter including a plurality of pixels having at least two color regions having different spectral sensitivity characteristics in the same pixel, and wherein a first color region of the color region
The entire outer periphery of the color area is surrounded by the second color area.

Further, the solid-state image sensor of the present invention has at least two types of color regions having different spectral sensitivity characteristics within the same pixel, and the entire outer periphery of the first color region is surrounded by another second color region. The color filter includes a plurality of pixels.

[Explanation of Examples]

Next, embodiments of the present invention will be described using the drawings.

FIG. 1 is a plan view of an embodiment of the color filter of the present invention.

In FIG. 1, in a color filter 1, pixels 2 each having a colored region formed from a colored dyed layer are arranged in a vertical and horizontal manner, and an undyed separation region 3 is formed between them. Parts 2a, 2b, and 2C of the pixel 2 are formed from 2fl color areas.

In the pixel 2aiC, which is composed of a solid area and a W area, the entire outer periphery of the W area is surrounded by the solid area. In other words, it is sufficient that the W region is formed with a certain area within the region,
There is no need to specify its position. Therefore, accurate mask alignment for forming the W region is not necessary.

The areas of the narrow region and the W region are determined by the precision of the mask for forming the pixel 2 and the narrow region. Therefore, compared to conventional dividing methods, two types of color regions can be formed easily and accurately with arbitrary area ratios.

The W area can be provided by, for example, masking the W area and forming an uncolored (transparent) color filter, or forming the entire pixel with phosphor, G, B, etc., and then forming the W area.
It is also possible to remove the portion forming the region by punching or etching to form the W region.

Incidentally, since the combination of the two types of color regions and the area ratio thereof can be arbitrarily selected, the spectral sensitivity characteristics of the color filter can be easily controlled.

FIG. 2 shows B and G at the pixel 2a in FIG.

FIG.

As shown in pixel 2a, the amount of light is increased by providing the W@ area in the 几 area, and the color signals of 9B, G, and R, which are shaded in addition to the 几 signal, are proportional to the area of the W area. Obtained by sensitivity. Therefore, a color filter with improved sensitivity and resolution can be obtained.

FIG. 3 is a plan view of another embodiment of the color filter of the present invention, in which 1 pixel 2 (12 types of complementary color areas (Cy, Ye))
This shows the case where it is formed.

They are formed with a relatively small area ratio in the Ye region cy region, and the color sensitivity obtained from these regions is as shown in FIG. That is, in addition to the B and G signals from the scY region, the 9G and 3 signals shown by diagonal lines are obtained from the Ye region, so that a color filter with improved resolution and sensitivity can be obtained, as in the case of FIG. 1.

Cy and Ye regions can be easily formed using a well-known technique of separately dyeing a dyed layer provided on a transparent substrate such as glass.

FIG. 5 is a sectional view of an embodiment of the solid-state image sensing device of the present invention.

In FIG. 5, the solid-state image sensor 10 includes, for example, a photosensitive section 11. CO having a non-photosensitive part 12 coming from a charge transfer part etc.
It consists of a D element 13 and a force 2-filter 1 which is aligned and laminated onto this CCL) element. The color filter 1 is made in the same way as in FIG.

That is, the same pixel 2C is formed from a hollow area and a W area, and the entire outer periphery of the W area is surrounded by the hollow area. Note that 4 is a glass substrate.

As described above, according to the embodiment of the present invention, the solid-state image sensor 10
This is because one pixel includes a color filter including a plurality of pixels having color regions of 211 [classes].

A solid-state imaging device having arbitrary spectral sensitivity can be obtained.

〔Effect of the invention〕

As described above in detail, the present invention provides a color filter having a plurality of pixels each having two ellipsoidal color regions with accurate area ratios in one pixel and having arbitrary spectral sensitivity characteristics; The effect is great because a solid-state imaging device equipped with a filter and with improved resolution and sensitivity can be obtained.

[Brief explanation of drawings]

FIG. 1 is a plan view of an embodiment of the color filter of the present invention;
Fig. 2 is a diagram for explaining the spectral sensitivity of one pixel in Fig. 1, Fig. 3 is a plan view of another embodiment of the color filter of the present invention, and Fig. 4 is a diagram for explaining the spectral sensitivity of one pixel in Fig. 3. FIG. 5 is a cross-sectional view of an embodiment of the solid-state image sensing device of the present invention, and FIG. 6 is a plan view of an example of a conventional color filter. 1...Color filter, 2...Pixel,
3...Separation area, 4...Glass substrate,
10... Solid-state image sensor, 11... Photosensitive section, 12... Non-photosensitive section, 13... CC
D element, 21.22...color area. Kaya 1 separate 3fR (↑) (Fraud) [8] BQF? e ′嘗ra-bun] Colorful range゛

Claims (1)

[Claims] The color filter includes a pixel that has at least two types of color regions having different spectral sensitivity characteristics within the same pixel, and the entire outer periphery of the first color region is surrounded by the second color region. A solid-state imaging device characterized by: