JPH0396184A - Solid-state image pickup device - Google Patents

Abstract

PURPOSE:To obtain a high luminance resolution and excellent color reproducibility by applying selectively low pass filter processing to a picture element array of color signal outputs. CONSTITUTION:Light collection processing is applied to tilt arrangement of luminance signals c, d and low pass filter processing is applied to tilt arrangement of luminance signals a, b. For example, a light reaching a 1st color filter 21 is subjected to optical low pass filter processing because a surface processing layer 10 is formed to collect the light from preceding and succeeding 2nd color filters 20, and the light reaching the 2nd color filter 20 is similarly subjected to optical low pass filter processing. Since a 3rd color filter 25 consists of two filters of, e.g. cyan and yellow or a green filter, the light made incident in the 3rd color filter 25 is collected by one picture element with the surface processing layer 10, then the sensitivity is improved. Thus, the luminance resolution and color reproducibility are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a solid-state imaging device such as a video camera having a photoelectric conversion means.

2. Description of the Related Art In recent years, solid-state imaging devices have been used in imaging devices such as video cameras. Solid-state image sensors have various advantages, such as being small and lightweight, having uniform spatial resolution across the screen, and having low afterimages.

However, as it is desired to further improve the resolution of EDTV, HDTV, etc., there are issues such as a decrease in sensitivity due to the increase in the number of pixels in solid-state imaging devices, and how to balance the increase in the number of pixels with the color signal band.

FIG. 3(a) is a composition diagram showing an example of a pixel arrangement of a conventional solid-state image sensor, and FIG. 3(b) is a composition diagram showing a photoelectric conversion section of the conventional solid-state image sensor. In Figure 3(a), 4
0 indicates a pixel that outputs the first color signal C1, 41 indicates a pixel that outputs the second color signal C2, and 42 indicates a pixel that outputs the luminance signal Y. The pixel arrangement shown in FIG. 3(a) is called a Bayer arrangement.

Moreover, in FIG. 3(b), 33. 34. 35 is, for example, 42. in FIG. 3(a). 41. These are photodiodes arranged in 42 pixel columns, 30, 31.
32 is a color filter. In the Bayer configuration, C
Each pixel of 1, C2, and Y is realized by, for example, primary color filters of R, B, and G, and therefore has the advantage of good color reproducibility. However, the intervals between the same color filters are every other pixel, as shown in the pixel interval of the pixel 40 that outputs the first color signal C1 in FIG. 3(a), and the optical Schematic diagram showing the luminance signal band where the low-pass filter has no choice but to have a narrow band and the luminance signal is transmitted.
Figure (b) is a schematic diagram showing the color signal band obtained from the conventional Bayer arrangement. As shown in FIG. 4, the luminance signal band fty and the chrominance signal band f2c are equal, and there is a problem that a sufficient luminance resolution cannot be obtained.

Means for Solving the Problems In order to solve the above problems, the present invention provides a solid-state imaging device in which a pixel that outputs a luminance signal and a pixel that outputs a color signal are arranged separately. , is configured to selectively perform low-pass filtering on the pixel row that outputs the color signal, and further selectively performs an optical low-pass filter on the pixel row that outputs the color signal. It is configured to selectively perform light condensing processing on pixel columns that output. In addition, a solid-state imaging device in which a pixel that outputs a luminance signal and a pixel that outputs a color signal are separated and arranged diagonally to each other, and the pixel row that outputs the color signal is selectively low-pass filtered. Furthermore, the pixel row that outputs the color signal is selectively subjected to low-pass filtering processing, and the pixel row that outputs the luminance signal is selectively subjected to light condensing processing. It is configured. In addition, the solid-state imaging device is a solid-state imaging device in which pixels that output a green signal and pixels that output red and blue signals are arranged separately, and the pixel row that outputs the red and blue signals is selectively It is configured to apply a pass-pass filter, and further applies an optical low-pass filter selectively to the pixel rows that output red and blue signals, and selectively focuses light on the pixel rows that output green signals. It is configured to perform processing.

In addition, the solid-state imaging device is a solid-state imaging device in which pixels that output a green signal and pixels that output red and blue signals are separated and arranged diagonally to each other, and the pixel row that outputs the red and blue signals is selectively The pixel rows that output red and blue signals are selectively subjected to low-pass filtering, and the pixel rows that output green signals are selectively concentrated. It is configured to perform light treatment.

Operation The solid-state imaging device of the present invention has the above-described configuration, thereby providing a solid-state imaging device with higher luminance resolution and better color reproducibility than conventional solid-state imaging devices.

Embodiment Hereinafter, one embodiment of a solid-state imaging device according to the present invention will be described with reference to the drawings.

In FIG. 1, (a) is a composition diagram showing the pixel arrangement of the solid-state imaging device of the present invention, and FIG. FIG. 1C is an explanatory diagram showing processing for light incident on a pixel that outputs a luminance signal. Figure 1 shows (a
), the pixel l outputting the first color signal Cl and the second
The pixels 3 that output the color signal C2 are arranged diagonally, and the pixels 2 that output the luminance signal Y are arranged diagonally in the remaining pixel columns. As shown in FIG. 1(C), the diagonal array of luminance signals C and d in FIG. 1(a) is subjected to light condensing processing, and the colors a and b in FIG. The diagonal array of signals is subjected to low-pass filtering as shown in FIG. 1(b). In FIG. 1(b), 10 is a surface treatment layer, 20 is a first color filter that produces a color signal C1, and 2l is a second color filter that produces a color signal C2. 22 is a photodiode. For example, the light arriving at the first color filter 21 is subjected to optical low-pass filtering because the surface treatment layer IO is configured to collect light from the front and rear second color filters 20. Second color filter 2
The light that reaches 0 is similarly subjected to optical low-pass filtering. Further, in FIG. 1(c), 25 is a third color filter that produces a luminance signal. The third color filter 25 includes, for example, two filters, cyan and yellow, or a green filter. For example, since the light incident on the third color filter 25 is focused by l pixels by the surface treatment layer 10, the sensitivity is improved.

FIG. 2(a) shows a luminance signal band fly used in the solid-state imaging device of the present invention, and FIG. 2(b) shows a color signal band flc used in the solid-state imaging device of the invention. As shown in FIG. 2, since low-pass filtering is selectively applied to the pixel rows that generate color signals, the luminance signal band r1y can be made wider than the color signal band flc.

Effects of the Invention As described above, according to the solid-state imaging device of the present invention, a solid-state imaging device having high luminance resolution and good color reproducibility can be obtained, and its industrial value is great.

[Brief explanation of drawings]

FIG. 1(a) is a configuration diagram showing a pixel arrangement of a solid-state imaging device according to an embodiment of the present invention, and FIG. 1(b) is a block diagram showing a pixel arrangement of a solid-state imaging device according to an embodiment of the present invention. FIG. 1(c) is an explanatory diagram of processing for incident light, and FIG. 2(a) is an explanatory diagram of processing for incident light on a pixel that outputs a luminance signal of a solid-state imaging device in an embodiment of the present invention.
is a schematic diagram showing the luminance signal band according to the present invention, FIG.
) is a schematic diagram showing the color signal band according to the present invention, and FIG.
) is a composition diagram showing the pixel arrangement of a conventional solid-state imaging device, FIG. 3(b) is a configuration diagram showing the photoelectric conversion section of a conventional solid-state imaging device, and FIG. 4(a) is a diagram showing a conventional solid-state imaging device. FIG. 4B is a schematic diagram showing a luminance signal band, and FIG. 4(b) is a schematic diagram showing a color signal band in a conventional solid-state imaging device. l... Pixel outputting the first color signal C1, 2.
...Pixel that outputs the luminance signal Y, 3...
Pixel for outputting the second color signal C2, 10... Surface treatment layer, 20... First pixel for producing the color signal C1
color filter, 2l...second color filter for controlling the color signal C2, 22...photodiode, 2
5...Third color filter that enhances the luminance signal,
50... Solid-state imaging device.

Claims (8)

[Claims] (1) A solid-state imaging device in which a pixel that outputs a luminance signal and a pixel that outputs a color signal are arranged separately, and low-pass filtering processing is selectively performed on the pixel row that outputs the color signal. A solid-state imaging device configured as follows. (2) A solid-state imaging device in which a pixel that outputs a luminance signal and a pixel that outputs a color signal are arranged separately, and the pixel row that outputs the color signal is selectively subjected to low-pass filtering processing. A solid-state imaging device configured to selectively perform a light condensing process on a pixel column that outputs the luminance signal. (3) A solid-state imaging device in which a pixel that outputs a luminance signal and a pixel that outputs a color signal are separated and arranged diagonally to each other, and the pixel column that outputs the color signal selectively has a low frequency band. A solid-state imaging device configured to perform filtering processing. (4) A solid-state imaging device in which a pixel that outputs a luminance signal and a pixel that outputs a color signal are separated and arranged diagonally to each other, and the pixel that outputs the color signal is selectively selectively A solid-state imaging device configured to perform filtering processing and selectively perform light focusing processing on a pixel column that outputs the luminance signal. (5) A solid-state imaging device in which a pixel that outputs a green signal and a pixel that outputs a red and blue signal are arranged separately, wherein the pixel row that outputs the red and blue signals is selectively A solid-state imaging device configured to apply a low-pass filter. (6) A solid-state imaging device in which a pixel that outputs a green signal and a pixel that outputs a red and blue signal are arranged separately, wherein the pixel column that outputs the red and blue signals is selectively A solid-state imaging device configured to apply a low-pass filter and selectively perform light focusing processing on a pixel row that outputs a green signal. (7) A solid-state imaging device in which a pixel that outputs a green signal and a pixel that outputs a red and blue signal are separated and arranged diagonally to each other, and selected for the pixel column that outputs the red and blue signals. A solid-state imaging device configured to perform low-pass filtering processing. (8) A solid-state imaging device in which a pixel that outputs a green signal and a pixel that outputs a red and blue signal are separated and arranged diagonally to each other, and the pixel column that outputs the red and blue signals is selectively A solid-state imaging device configured to perform low-pass filtering processing on the pixel array and selectively perform light focusing processing on the pixel row that outputs the green signal.