JPS6342590A - Color solid-state image pickup device - Google Patents

Abstract

PURPOSE:To simplify a circuit constitution, to solve a problem such as a phase difference between a luminance signal and a carrier chrominance signal by handling the luminance signal and the carrier chrominance signal simultaneously, and to eliminate color smear, by using a memory circuit as a color coding circuit. CONSTITUTION:A color solid-state image pickup element 1 is driven by a timing generation circuit 8, and primary chrominance signals(R, G, and B) are taken out. The timing generation circuit 8 is also connected to latch circuits 3, 5, and 7. Signals from the color solid-state image pickup element 1 are digitized at A/D converters 2, 4, and 6, and are held at the latch circuits 3, 5, and 7. And those signals are connected to the memory circuit 9 as the address signals. Meanwhile, from the timing generation circuit 8, phase information to a color burst signal in the from of the digital signal, is also connected to the memory circuit 9 as an address. Sampling data according to the primary chrominance signals(R, G, and B) are outputted sequentially from the memory circuit 9, and a video signal is outputted from the video output terminal 11 of a D/A converter 10.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a color solid-state imaging device.

(Summary of the Invention) The present invention provides a color solid-state imaging device in which the circuit configuration 1 is simplified by using a memory circuit in the color encoder circuit.

[Conventional technology]

A block diagram of a conventional color solid-state imaging device is shown in FIG. 2. In FIG. 2, 1 is a color solid-state imaging device, 11 is a video output terminal, 12 is a matrix circuit, and 13 is a color solid-state imaging device.

14 is the subtraction circuit %15, 16 is the filter, 17,
18 is a double balanced modulator, 19.24 is an adder, addition is a timing generation circuit, 21 and 22 are 180°, 9
The 0° phaser is the burst generator.

The operation is as follows. The color solid-state image sensor 1 is driven by a timing generation circuit. And the primary color signal (
Rt Gt B) is removed. A matrix circuit 12 generates a luminance signal (Y signal) from these signals. On the other hand, the subtraction circuits 13 and 14 produce two color difference signals, the R-Y signal and the B-Y signal, and the filter 15
, 16 becomes a signal of a predetermined band, and the color subcarrier from the timing generation circuit I is passed through a 180° phase shifter 21.
, 9Q' phase shifter 22fc, and two color subcarriers having a phase difference of 90' are generated. These two color subcarriers are modulated with separate color difference signals R-Y and B-Y in double balanced modulators 17 and 18, and added in an adder 19 to produce a carrier color signal.

The burst generator Okara outputs a color burst signal based on the color subcarrier from the timing generator circuit. In the atomizer 24, the luminance signal, the carrier color signal, the color burst signal, and the synchronization signal from the timing generator are added together, and a video signal is output from the video output terminal 11.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional technology, only a luminance signal and a carrier chrominance signal are used.
The circuit is complicated because the sheets are printed separately, and the luminance signal and carrier color signal pass through separate circuits, which causes a phase difference between the two signals and causes color blurring. SUMMARY OF THE INVENTION The present invention is intended to solve these problems, and its purpose is to provide a color solid-state imaging device with a simple circuit configuration and fewer adjustments.

Means for Solving Problem c] The color solid-state imaging device of the present invention is a color solid-state imaging device using a solid-state imaging device, and an A/D that converts the color solid-state imaging device output from analog to digital. Conversion circuit, A
A latch circuit that latches the output of the ρ conversion circuit, a timing generation circuit connected to the color solid-state image sensor and the latch circuit,
The present invention is characterized in that it includes a memory circuit which inputs the output of the latch circuit and the output of the timing generation circuit, and a D/M conversion circuit which inputs the output of the memory circuit and performs digital to analog conversion.

[Effect]

According to the above-described groove 11i1EK of the present invention, the primary color signals from the color solid-state imaging device are digitized by the A/D conversion circuit and held by the latch circuit. Then, based on the phase information of the color subcarrier from the timing generation circuit, the video information stored in the storage circuit in advance is output. Then, it is converted into an analog signal by a D/A conversion circuit to obtain a video signal.

[Implementation row]

FIG. 1 shows a block diagram of a color solid-state image pickup device in an embodiment according to the present invention, in which 1 is a color solid-state image sensor, 2 and 4.6 are A/D conversion circuits, and 3 and 5.7 are latch circuits. , 8 is a timing generation circuit, 9 is a storage circuit,
10 is a D/A conversion circuit, and 11 is a video output terminal. Before explaining the operation, let us first explain the image signals in Figures 3 to 6.
This will be explained using figures.

In Figures 3 and 4, α is the synchronization signal, b is the color
In the burst signal, 0 is the average video level and d is the carrier color signal. Since the signals in FIGS. 3 and 4 have the same average video level of C, that is, the brightness signal, the brightness perceived by the eyes is the same. However, it can be seen that in the case of FIG. 3, the carrier color signal d matches the phase of the color burst, but in the case of FIG. 4, the phase is different by 180'. In other words, the hues are different. Parts of the video signals in FIGS. 3 and 4 are shown in FIGS. 5 and 6. The video signals of the respective colors can be expressed by the sampled data in the area A on the right side of FIG. In other words, it can be expressed by K by repeating each sampling data. From this, it follows that all colors are primary color signals (”
s Gs B) is determined, it is known that sampling data corresponding to it exists. Therefore, when creating a video signal, once the primary color signal (Rs Gt B) is determined, the sampling data stored in the storage circuit in advance is sequentially processed based on the phase information of the color burst signal. If you send it out, you can create a video signal. Specifically, each of the primary color signals (R?GtB) is expressed using multiple bits, and the sampling data for each color is the same (expressed using multiple bits.) All of these sampling data are stored in advance in a storage circuit. By storing each data of the primary color signals (R, G, B) as an address and similarly giving the color burst signal as an address, when the sampling data for each color is read out, 7 is obtained, and that data i D A video signal is obtained by performing /A conversion.

In the case of FIG. 1, the signal i A from the color solid-state image sensor l
Digitized by /D conversion circuit 2, 4.6.

It is held in latch circuits 3, 5, and 7. These signals are then connected as address signals for the memory circuit 9. On the other hand, from the timing generation circuit 8, phase information with respect to the color burst signal is a digital signal, which is also connected to the storage circuit 9 as an address. By connecting in this way, the storage circuit 9 outputs the primary color signal (R+Gt
B) Sampling data according to K is output sequentially, and D
A video signal is output from the video output terminal 11 of the /A conversion circuit lυ.

〔Effect of the invention〕

As described above, according to the present invention, the circuit WI configuration is simplified, and since the luminance signal and the carrier color signal are handled simultaneously, problems such as the phase difference between the luminance signal and the carrier color signal are eliminated, and the invention is inexpensive. This has the effect of providing a beautiful color solid-state imaging device without color bleeding or the like.

Further, although the above explanation has been based on primary color signals, it is clear that similar effects can be obtained with complementary color signals.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a color solid-state imaging device according to the present invention. FIG. 2 is a block diagram of a conventional color solid-state imaging device. FIGS. 3 and 4 are waveform diagrams shown in video signal 1. FIGS. 5 and 6 are waveform diagrams showing the principle of FIG. Memory circuit 10... D/A conversion circuit and applicant Seiko Epson Corporation O Figure 2 Figure 3 d Figure 4 Figure 5 A Figure 6

Claims (1)

[Claims] (1) a) In a color solid-state imaging device using a color solid-state imaging device, b) A/D conversion circuit that converts the color solid-state imaging device output from analog to digital c) A latch circuit d that latches the A/D conversion circuit output ) A timing generation circuit connected to the color solid-state image sensor and the latch circuit e) A memory circuit that receives the latch circuit output and the timing generation circuit output as input f) A D/A conversion circuit that performs digital-to-analog conversion that receives the memory circuit output as input A color solid-state imaging device characterized by comprising: