JPS6284690A - Solid-state image pickup element for color picture - Google Patents

Abstract

PURPOSE:To simplify a synthesis processing circuit for a chrominance signal and to make a 1H delay line unnecessary by installing a luminance signal-only 1H line and a chrominance component-only 1H line on a picture element part and simultaneously reading a luminance signal and a chrominance signal, both of which are detected their own lines after they are supplied to their own horizontal charge transfer units. CONSTITUTION:A microfilter is constructed with 1H lines (W, W...) whose fields A and B are used only for a luminance signal and 1H lines (RBRB...) only for a chrominance component, and the fields A and B are alternately arrayed in a vertical direction. The horizontal charge transfer part supplies the luminance signal and the chrominance signal, both of which are read by respective light receiving parts 1, to transfer units 3 and 4 through a vertical charge transfer part 2. The luminance signal and the chrominance signal, both of which are supplied to the transfer units 3 and 4, are simultaneously read through an amplifier 5, and occurrently the output of the chrominance signal is read through the amplifier 5 and a changeover switch 7. All of the read-out signals are inputted to a matrix circuit 6. The luminance signal and the chrominance signal, both of which are supplied to the matrix circuit 6, are arithmetic-processed whereby signals such as R, G, B, Y, R-Y and B-Y can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a solid-state image sensor for color images, and in particular to RGB
The present invention relates to a solid-state imaging device for color images that simplifies signal processing for signal synthesis.

(Prior art) Since the pixels of a solid-state image sensor for color images are independent, it is well known that, for example, it is possible to attach R, G, and B filters to each of them and obtain a color signal in correspondence with a readout clock. be. However, in this case, there are various types of mosaic arrangement of R, G, and B filters, and the color of the filter may be complementary color 07+Mg, Ye, or white W.

Basically, if the filters are arranged in a repeating pattern of R2O, B according to the scanning order, each color signal can be obtained equally, but with this method, the same color signal is obtained in three pixel intervals. As a result, the horizontal resolution deteriorates significantly. In reality, the so-called Bayer array is an effective method to prevent apparent resolution degradation. In the Bayer array, the filter fRGRG in the column corresponding to the odd-numbered scanning line...
On the other hand, let the filter of the even numbered column be QBOB...
In that case, at least two pixels are All color signals of R, G, and B are formed within the period of .

(Problems to be solved by the invention) Regarding the image quality of this method itself, there is little decrease in resolution;
Although it is an excellent method, R, G, B including IH delay line
A signal synthesis circuit is complex and has many parts.

SUMMARY OF THE INVENTION An object of the present invention is to provide a solid-state image pickup device for color images that has a simplified color signal synthesis processing circuit and does not require the use of a 1H delay line.

(Means for Solving the Problems) The present invention provides 1H lines exclusively for brightness and 1H lines for color extending horizontally in the pixel portion, and arranging them alternately in the vertical direction so that the signals detected from each line are arranged vertically alternately. After supplying both the luminance signal and the color signal to horizontal charge transfer units dedicated to brightness and color, respectively, they are simultaneously read out to read out R, G, B or Y, R-Y, B- in the matrix circuit.
It is combined into signals such as Y.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

The figure is a schematic configuration diagram of a solid-state image sensor according to an embodiment of the present invention.

The light receiving section 1 and the vertical charge transfer section 2 are simplified and shown as one block, and the microfilter placed above the light receiving section 1 corresponds to each pixel and displays its color as shown in the figure. It is divided into colors with symbols W, R and B.

In the illustrated embodiment, the solid-state image sensor is a standard television system, NTSC! This applies to the method. Therefore, the light receiving section 1 is provided with 1000 rows of photoelectric conversion elements in a substantially vertical direction, and 500 to 800 photoelectric conversion elements are provided in each row in a substantially horizontal direction.

The lines marked A and B in the figure are respectively A field j
, . This is a row for reading out the image signals of field B.

. As shown in the figure, the microfilter has fields A and B each consisting of a 1H line (WW...) dedicated to brightness and a 1H line (RBRB...) dedicated to color. Fields and B fields are arranged alternately in the duty direction.

In addition, the horizontal charge transfer section includes a transfer unit 3 dedicated to brightness,
The luminance signal and the color signal read by each of the light receiving sections 1 are supplied to the respective transfer units 6.4 via the vertical charge transfer section 2.

The luminance signal and chrominance signal supplied to each transfer unit 3, 4 are read out simultaneously via an amplifier 5, and the output of the chrominance signal is further read out via a changeover switch 7.
The signal is input to the IJ bus circuit 6.

The changeover switch 7 is alternately switched at a cycle of fs/2 (fa: sampling frequency) to separately input the R and B signals to the matrix circuit 6.

The structure of the matrix circuit 6 is, as is well known, a weighting addition (subtraction by 3) circuit using resistance elements.

During each field period, the luminance signals and color signals supplied from the horizontal charge transfer units 3 and 4 to the matrix circuit 6 are processed, and signals such as R, G, B, Y, R-Y, B-Y, etc. are obtained. It will be done.

FIG. 2 shows an example of another filter arrangement in which complementary color filters are used and Oy and Yθ are alternately arranged for one Mg color and one for brightness. Alternatively, the luminance signal component may be obtained from an iG filter.

(Effects of the Invention) According to the present invention, the 1H lines dedicated to brightness and the 1H lines dedicated to color are vertically arranged as a pair, and the detected brightness signal and color signal are connected to two horizontal charges dedicated to brightness and color respectively. Since the signal is provided to be transferred by the transfer unit, simplified signal processing is possible without using a 1H delay line unlike the conventional example.

Further, by dividing the image into 976 in the vertical direction (244X2X2), complete interlacing in the HTSC system becomes possible, and the vertical resolution of the image can be further improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram explaining one embodiment of the present invention, and FIG.
The figure is a block diagram illustrating another embodiment. 1... Light receiving section, 2... Vertical charge transfer section, 3, 4...
- Horizontal charge transfer section, 5... amplifier, 6... matrix circuit, 7... changeover switch. 1st drawing and 2nd figure Number 207, Corrected counterpart:
[1] Amend the "Claims" column in the specification (2) the "Detailed Description of the Invention" column for the specification. Claims: A solid-state image pickup device for color images consisting of a nine-piece image sensor consisting of a light receiving section, a charge transfer section, and a transfer control section, and mosaic-shaped microfilters arranged on the light receiving section in correspondence with pixels. , each of the luminance-only 1 day line and color-only T]1H line extending horizontally to the pixel ■ Fii! In addition, the brightness signal and the color signal detected by the two daily lines are distributed to the brightness-only horizontal charge transfer unit and the color-only horizontal charge transfer unit, and are read out in pairs at the same time. Characteristic solid-state image sensor for color images. Procedural amendment dated December 1, 1986.

Claims (1)

[Claims] In a solid-state image sensor for color images, which consists of a solid-state image sensor consisting of a light-receiving section, a charge transfer section, and a transfer control section, and a mosaic-like microfilter arranged on the light-receiving section in correspondence with the pixels, the pixel section is A 1H line exclusively for brightness and a 1H line exclusively for color extending from the 1H line are arranged alternately in the vertical direction, and the luminance signal and color signal detected by both the 1H lines are transferred to a horizontal charge transfer unit for brightness and a horizontal charge transfer unit for color. 1. A solid-state image pickup device for color images, characterized in that the device is distributed to a charge transfer unit and simultaneously read out in pairs.