JP2690186B2 - Solid-state imaging device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid-state imaging device capable of controlling a vertical transfer pulse from an external device and simultaneously controlling an axial direction of a color difference signal.

2. Description of the Related Art In recent years, development of video cameras and electronic still cameras using a solid-state image sensor has been focused on their small size, light weight, high image quality, multifunction, and low price.

First, FIG. 4 shows a system of a conventional solid-state imaging device. The solid-state image pickup device includes a solid-state image pickup element 18 and a vertical transfer control unit 1.
9. A solid-state image sensor driving signal generator 20, a signal processor 21, and a solid-state image sensor 18 includes a photoelectric conversion element 14, a vertical transfer unit 15, a horizontal transfer unit 16, and a signal charge detection unit 17. .

FIG. 5 shows a configuration example of a conventional color difference signal recognition pulse (hereinafter abbreviated as FH2 pulse) generation circuit in the signal generator 20.

The FH2 pulse is created by dividing the horizontal synchronizing signal (hereinafter, abbreviated as HD) by a T flip-flop 22 or the like into 1/2.

Hereinafter, the timing of the FH2 pulse will be described with reference to FIG.

FIG. 6 shows HD, FH2 pulses, and four vertical transfer pulses in the video period of a television signal, that is, a vertical transfer section first gate application pulse (hereinafter abbreviated as φV1 pulse),
Vertical transfer section second gate application pulse (hereinafter abbreviated as φV2 pulse), vertical transfer section third gate application pulse (hereinafter φ
Abbreviated as V3 pulse. ), A vertical transfer section fourth gate application pulse (hereinafter abbreviated as φV4 pulse).

 The FH2 pulse inverts the logic every time HD is input.

Then, it is determined whether the axial direction of the color difference signal in each horizontal scanning period, which is transferred by the vertical transfer pulse and is generated by the signal charge output from the solid-state image sensor, is 2R-G or C-2B.
It is recognized by the logic of FH2 pulse, and color processing is performed by the signal processing circuit.

By performing the processing in this manner, a color television signal is created.

However, in the above-described configuration, when the vertical transfer pulse is suppressed by an odd number of stages by the control signal from the outside by the camera shake prevention function or the electronic zoom, the axial direction of the color difference signal is reversed. become.

The present invention has been made in view of the above drawbacks, and an object of the present invention is to provide a solid-state imaging device capable of suppressing a vertical transfer pulse and simultaneously suppressing a logical change of a pulse for recognizing a color difference signal.

Means for Solving the Problems In order to achieve the above object, the solid-state imaging device of the present invention is applied to a vertical transfer unit of the solid-state imaging device within a horizontal blanking period by a control signal input from an external device. And a circuit for suppressing the vertical transfer pulse and a circuit for suppressing the logical change of the pulse for recognizing the color difference signal at the same time as the vertical transfer pulse suppression.

Operation With this configuration, the color difference signal recognition pulse can be controlled according to the number of vertical transfer stages to obtain the correct color difference signal axial direction.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a system diagram of a solid-state imaging device according to the present invention.

The solid-state imaging device according to the present invention includes a solid-state imaging device 5, a vertical transfer control device 6, a solid-state imaging device driving signal generation unit 7, a signal processing unit 8, a signal processing pulse control unit 9, and an FH2 control unit 10, The solid-state image sensor 5 includes a photoelectric conversion element 1, a vertical transfer unit 2,
It comprises a horizontal transfer section 3 and a signal charge detection section 4.

FIG. 2 shows a configuration example of the FH2 pulse control circuit and the FH2 pulse generation circuit according to the present invention.
And AND gate 12.

FIG. 3A shows a horizontal synchronizing signal HD for a television signal, a transfer control signal from the outside (hereinafter abbreviated as CTRL pulse),
FH2 pulse in the present invention, solid-state image sensor drive pulse φV
1, φV2, φV3, φV4, CCD output signal, luminance signal, color difference signal ((2R-G) + (2B-G)), color difference signal (2R-G), color difference signal (2B-G) and color television signal And various voltages of the drive pulse are shown in FIG.

When the CTRL pulse is at "L" level, the FH2 pulse inverts the logic every HD input. In addition, vertical transfer pulses φV1, φV
2, φV3, φV4 are also output for each HD input.

Here, when the CTRL pulse becomes “H” level, the AND gate suppresses the HD input, and the logic inversion of the FH2 pulse does not occur. Also, the vertical transfer pulse 3 is not output.

Transferred by the vertical transfer pulse 13, the signal charge detection unit 4
The CCD output signal output from the device is converted into a luminance signal by passing through a low pass filter.

Further, by separately passing through a bandpass filter / color sampling circuit, a 2R-G, 2B-G repetitive color difference signal is obtained for each scanning line.

The color difference signals obtained in this way pass through the 1H delay line, and signals that pass through the 1H delay line and signals that do not pass are selected by the FH2 pulse for synchronization. For example,
Connect 1H delay line output to 2B-G output when FH2 is "L" level, connect 1H delay pre-signal to 2R-G output, and 1H delay line output to 2R-G when FH2 is "H" level. Connect to output, connect output before 1H delay to output 2B-G. By synchronizing like this, 2
The color difference signals in the 2R-G and 2B-G directions are always converted into one output signal.

This color difference signal is modulated and a luminance signal / synchronization signal is added to create a color television signal.

The portion thinned out by the CTRL pulse is interpolated by using the signal 1H before.

By performing the processing in this manner, a color television signal is created.

As a result, the inversion of the color difference signals in the axial direction does not occur due to the suppression of the vertical transfer pulse in the electronic zoom or the like having a hand-shake function by driving the solid-state image sensor.

In this embodiment, the circuit configuration example using the T flip-flop and the AND gate has been described, but another logic circuit may be used.

EFFECTS OF THE INVENTION As described above, in the present invention, it is possible to control the recognition pulse of the color difference signal in accordance with the suppression of the vertical transfer.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing the system configuration of the solid-state imaging device of the present invention, FIG. 2 is a circuit diagram of the FH2 pulse control circuit of the present invention, and FIG. 3 (a) is a horizontal synchronizing signal for television signals and external signals. Control signals, waveform diagrams of the FH2 pulse and the drive pulse of the solid-state image pickup device in the present invention, the same (b) is a detailed waveform diagram of the φV1 to φV4 pulses, and FIG. 4 is a circuit diagram of the system configuration of the conventional solid-state image pickup device. , Fig. 5 shows a conventional example
FIG. 6 is a circuit diagram of the FH2 pulse generation circuit, and FIG. 6 is a waveform diagram of a horizontal synchronizing signal for a television signal, an FH2 pulse in the conventional example, and a drive pulse of the solid-state image pickup device. 1,14 …… Photoelectric conversion element, 2,15 …… Vertical transfer unit, 3,16 ……
Horizontal transfer section, 4,17 ...... Signal charge detection section, 5,18 ...... Solid-state image sensor, 6,19 ...... Vertical transfer control section, 7,20 ...... Signal generation section, 8,21 ...... Signal processing section , 9 ... Pulse control unit for signal processing, 10 ... FH2 control unit, 11,22 ... T flip-flop,
12 …… AND gate, 13,23 …… Vertical transfer pulse.

Claims (1)

(57) [Claims] 1. A photoelectric conversion unit having a plurality of photoelectric conversion elements arranged two-dimensionally, a vertical transfer unit for vertically transferring signal charges accumulated in the photoelectric conversion unit, and a vertical transfer unit for transferring the signal charges. A solid-state image sensor having a horizontal transfer unit that transfers the signal charges in the horizontal direction, a signal charge detection unit that converts the signal charges from the horizontal transfer unit into a signal voltage or a signal current and outputs the signal voltage, and a control input from an external device. A circuit for suppressing a vertical transfer pulse applied to a vertical transfer section of the solid-state image sensor during a horizontal blanking period by a signal; and a circuit for suppressing the vertical transfer pulse suppression and a logical change of a color difference signal recognition pulse at the same time. A solid-state imaging device having a.