JPH02305187A - Driving device for solid-state image pickup element - Google Patents

Abstract

PURPOSE:To enable natural exposure correction by a solid-state image pickup element itself without feeling the change of dynamic resolution by intermittently wholly distributing an accumulating period in one field period. CONSTITUTION:At a time t10, the electric charge of a preceding sensor part 1 is sent from the sensor part 1 to a vertical transfer register 2 and the electric charge of the vertical transfer register 2 for one field is sent to a storage part 3 at high speed during a vertical return period. Afterwards, in order to define periods a1, a2, an-1 and an just before respective times t11, t12...tn+9 and tn+1- as the electric charge accumulating period, a removing pulse phiSUB is driven like a figure. Thus, the sweep-out (removal) and accumulation of the electric charge is intermittently executed. Thus, the natural exposure correction can be executed with the fixed dynamic resolution.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a driving device for a V1 body image sensor, and particularly to driving an electronic shutter.

[Conventional technology]

Conventionally, light that enters the image sensor is used as a means to achieve a function called exposure compensation in video cameras, etc. There are those that use aperture blades or the like to directly control it, and those that use a so-called electronic shutter function that controls the charge accumulation time of the image sensor.

[Problems to be Solved by the Invention] However, among the conventional examples described above, the method using aperture blades has a problem in that the aperture blade and mechanical members around it are required, and the method using an electronic shutter function,
There was a problem that the movement of the captured image became unnatural.

Hereinafter, the problems with the method using the electronic shutter function will be described in more detail.

FIG. 3 is a conceptual diagram of an interline transfer type CCD, in which 1 is a sensor section that performs photoelectric conversion, 2 is a vertical transfer register, 4 is a horizontal transfer register, and 5 is an output amplifier. FIG. 4 is a cross-section U'ii diagram and a bodential diagram taken along the line AA' in the figure.

In Figure 4, 6 is a channel stop (C3) for pixel distribution.
, 7 is a gate (ROG) for transferring the charges accumulated in the sensor section 1 to the vertical transfer register 2, 8 is a substrate 1 note, and 9 is an oxide film.

The operation during the electronic shutter will be explained using FIGS. 4 and 5. Figure 5 shows the standard telephone signal.
ΦROG is a pulse applied to readout cables 1 and 7, and when the logic level is “H”, the bodential of readout cable t and 7 drops, reducing the charge in sensor section l. Move to acceptable transfer register 2. The removal pulse ΦSUB is applied to the substray]・8.
When the pulse is "H", the charge accumulated in the sensor part 1 is passed through the ΦSOB terminal and swept out to the first part.

In this conventional example, in FIG. 5, ΦROG is during the vertical retrace period, and ΦSOB is during the horizontal retrace period. Time t. After reading out the electric charge of the sensor unit 1 at , the next period starts until time 5, t. If the load from 1,1 to 1,1 remains in the sensor section 11, it is no longer possible. , 11. %'ill t + h'la': 2 gusset 0': I interval i;, t ΦS u B="
I5'', the charge during this period is accumulated in the sensor section 1.
First, ΦR at time t. It is transferred to the superposition transfer register 2 with O G = "l(" pulse. After all, the exposure time in this case becomes (tz - t+).

Therefore, it fully fulfills all functions of the electric shutter.
b. When using the conventional electronic shutter function as exposure compensation, especially when trying to continuously vary the exposure time, the difference in dynamic resolution at each exposure time will appear on the screen as it is, This can result in very unsightly images.

The present invention has been made in view of the above circumstances, and is based on a driving system for a solid-state image sensor that realizes an electronic shutter function that can perform natural-looking exposure compensation with constant dynamic resolution.
(It is something to do.

[First step to solving problems]

In order to achieve the above objective, the present invention configures a driving device for a solid-state image sensor as shown in (1) below.

(1 sensing stage that receives optical signals and performs photoelectric conversion to produce 8 products of information; 1 first storage stage that reads information from the 1st sensing stage; and 1st storage stage that stores information from the 1st storage stage. 2. A driving device for a solid-state image sensor Y, comprising: a second storage means for removing information from the first stage of the sensing device;
- Intermittently remove the information of the dji' sensing stage by the 111th removing means, and read the information of the sensing stage 1 removal layer +) rf into the first storage means, and further!
A driving device ff for a solid-state image sensor that drives the navigation solid-state image sensor Y so as to transfer information in one stage of the first storage to a second storage means once per field period.

(Function) With the above configuration, information storage is performed intermittently by one stage of sensing during one field period, and garbage information is stored in the first memory 1.
The sum of each piece of information is stored in one stage, and the information of this sum is outputted via a second storage stage.

(Example) Hereinafter, the present invention will be explained with reference to Examples.

FIG. 2 is a conceptual diagram of a CCD sensor used in an embodiment of the present invention. This sensor is called a frame interline transfer type CCD, and the difference from FIG. 3 is a storage section 3 (second storage section).

dan). The number of memory cells of the memory section 3 is the same as the number of the sensor section 1 (sensing-1 stage). The charge from the sensor section 1 is transferred to the i[j direct transfer register 2 (first storage means), and then transferred to the storage section 3 during the vertical retrace period.
17,2 Thereafter, it is transferred to the horizontal transfer I non-star 4 at a predetermined timing, and read out through the output amplifier 5.

Furthermore, the cross-sectional view along the line A-A' in FIG. 2 and the voltage diagram are the same as those in FIG. The charge readout mechanism is also similar.

FIG. 1 is a diagram for explaining the operation of this embodiment, and is for explaining the driving method when exposure compensation is performed by the CCD sensor itself (not shown in FIG. 2).

At time tlQ, the charge of the previous sensor unit 1 is
The vertical transfer register 2 is sent to the vertical transfer register 2.
Charges for one field are sent to the storage unit 3 at high speed during the vertical retrace period (vertical transfer period in the figure). After that, as shown in the figure, at each time j l l rt+2..." j
n09, t n+IO facing period a1゜a2
In order to set + a, -+ T an to the charge 'l1h1 period, the removal pulse ΦSUB is driven as shown in the figure.

As a result, the +7 charge is removed and accumulated intermittently. Time tl I + tI 7”” ””
j n+9 +11□. Read pulse ΦRO at
Charge moves from the sensor section 1 to the vertical transfer register 2 due to G. Therefore, at time j n+lo, the transfer pulse ΦROG
Vertical transfer register 2 immediately after the period when is “H”
For Mh1 period a I + 82 ”” ”” a
This means that the total sum of charges generated in the sensor section 1 during n is accumulated. That is, the total sum of charges accumulated in the vertical transfer register 2 is controlled by one application period of the removal pulse ΦSUB in the l field period, and the CCD sensor itself functions as a shutter.

(Effect of the invention) As explained above, according to the present invention, the storage 4'fJυI
H! 1a l * a 2 ”” ”” a n is distributed evenly intermittently within one field IfJf, so the solid-state image sensor itself can perform natural exposure compensation without making you feel any change in dynamic resolution. can.

[Brief explanation of drawings]

FIG. 1 is a diagram explaining the operation of the embodiment of the present invention, FIG. 2 is a conceptual diagram of a frame interline transfer type CCD used in the same embodiment, and FIG. 3 is a conceptual diagram of an interline transfer type CCD. FIG. 4 is a sectional view and potential diagram taken along line AA' in FIG. 3, and FIG. 5 is a diagram for explaining the operation of the conventional electronic shutter.

Claims (1)

[Claims] (1) Sensing means that receives optical signals, performs photoelectric conversion and stores information, first storage means that reads information from the sensing means, and second storage means that stores information from the first storage means. A driving device for a solid-state image sensor, comprising a storage means and a removal means for removing information of the sensing means, wherein the information of the sensing means is intermittently removed by the removal means twice or more during one field period. The information immediately before the removal of the sensing means is read into the first storage means, and the information is read into the first storage means once in one field period.
A driving device for a solid-state image sensor, characterized in that the solid-state image sensor is driven to transfer information in a storage means to a second storage means.