CN106162002B - Image sensing circuit and its control method with power noise filtering function - Google Patents
Image sensing circuit and its control method with power noise filtering function Download PDFInfo
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Abstract
The present invention proposes a kind of image sensing circuit and its control method with power noise filtering function.Image sensing circuit with power noise filtering function includes: image sensing unit, to sensing image, to generate image sensing signal；Power noise sensing unit, to sense power noise, to generate power noise signal；Differential amplifier circuit is coupled with image sensing unit and power noise sensing unit respectively, to receive image sensing signal and power noise signal, and difference filtering signal is generated in a manner of differential amplification；And analog-to-digital conversion circuit (analog-to-digital converter circuit, ADC), it is coupled with differential amplifier circuit, to receive difference filtering signal, and generates digitized video signal.
Description
Technical field
The present invention relates to a kind of image sensing circuits and its control method with power noise filtering function, particularly relate to
A kind of image sensing circuit and its controlling party with power noise filtering function filtering power noise in a manner of differential amplification
Method.
Background technique
Fig. 1 shows a kind of typical complementary metal oxide semiconductor (complementary metal-oxide-
Semiconductor, CMOS) image sensing array circuit 1, include image sensing array 2, column (row) circuit 3 and row
(column) circuit 4；Wherein, image sensing array 2 includes multiple image sensing units 10.As shown, multiple image sensings
Unit 10 is arranged in matrix, is operated with the reading manner of similar memory for digits circuit, i.e., decodes image sensing list using column circuits 3
The position of member 10；And decode 10 position of image sensing unit using row circuit 4 and amplify signal and operate, and generate simulation shadow
As signal, and using analog-to-digital conversion circuit (not shown) converting analogue image signal therein as digitized video signal DIS1.
Be expert in circuit 4, every guild have analog-to-digital conversion circuit (analog-to-digital converter circuit,
ADC), analog image signal is converted into digitized video signal DIS1.
In existing technology, signal is counted via analog-to-digital conversion circuit (ADC), is converted to digitized video signal
After DIS1, operation can be just amplified in a digital manner, this is restricted resolution ratio；In addition, the power in circuit is made an uproar
Sound and dark current are also with digitized video signal DIS1 calculation process, this makes image playing circuit (not shown), according to number
Image after image signal DIS1 broadcasting, quality are restricted.
In view of this, the present invention i.e. in view of the above shortcomings of the prior art, proposes that one kind has power noise filtering function
Image sensing circuit and its control method, and in a manner of differential amplification to analog image sensing signal carry out operation, in number
The preceding filtering power noise that word image signal DIS1 is generated.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art and defect, propose a kind of with power noise filtering function
Image sensing circuit and its control method, and in a manner of differential amplification to analog image sensing signal carry out operation, in number
The preceding filtering power noise that word image signal DIS1 is generated.
In order to achieve the above object, saying that the present invention provides a kind of with power noise filtering function with regard to one of viewpoint
Image sensing circuit includes: an image sensing unit, to sensing image, to generate an image sensing signal；One power noise
Sensing unit, to sense power noise, to generate a power noise signal；One differential amplifier circuit, respectively with the image sense
Unit and power noise sensing unit coupling are surveyed, to receive the image sensing signal and the power noise signal, and with difference
Amplification mode and generate a difference filtering signal；And an analog-to-digital conversion circuit, it is coupled with the differential amplifier circuit, to connect
Difference filtering signal is received, and generates a digitized video signal, which includes: a comparator, with the difference
Divide amplifying circuit coupling, to receive difference filtering signal, and generates one and count signal；And a counting circuit, compared with this
Device coupling, is converted to a digitized video signal for the counting signal.
Preferably implement in kenel wherein a kind of, which includes: one first sample-and-hold circuit, with this
Image sensing unit coupling, to sample and store the image sensing signal；One second sample-and-hold circuit, with the power noise
Sensing unit coupling, to sample and store the power noise signal；One difference amplifier, comprising: two differential input ends, respectively
To receive the image sensing signal and the power noise signal；And two difference output ends, the pressure between two difference output end
Poor Δ V filters signal as the difference；One third sample-and-hold circuit, be connected to receive the image sensing signal the difference it is defeated
Enter end and wherein between the difference output end；And one the 4th sample-and-hold circuit, it is connected to and receives the power noise signal
The differential input end and another difference output end between.
In aforementioned implementation kenel, which is preferably respectively provided with second sample-and-hold circuit
One first capacitor, with first capacitor value C1, which is respectively provided with the 4th sample-and-hold circuit
One second capacitor has the second capacitance C2, the value of pressure differential deltap V are as follows:
Wherein the image sensing signal has voltage Vin, and the power noise signal has voltage Vip.
Preferably implement in kenel wherein a kind of, which is preferably comprised a hysteresis comparator,
With two magnetic hysteresis input terminals, it is respectively coupled to two difference output end, and refer to according to pressure differential deltap V and a ramp voltage and one
Voltage generates the counting signal.
Preferably implement in kenel wherein a kind of, the power noise sensing unit is in the way of shading or is not turned on wherein
One transfer switch mode, to generate the power noise signal.
In order to achieve the above object, saying that the present invention provides a kind of images for having power noise filtering function with regard to another viewpoint
The control method of sensing circuit includes: sensing image, to generate an image sensing signal；Power noise is sensed, to generate a function
Rate noise warning signal；The image sensing signal and the power noise signal are received, difference filtering is generated in a manner of differential amplification
Signal；Difference filtering signal is received, and generates one and counts signal；And the counting signal is converted into digitized video news
Number.
In aforementioned implementation kenel, the reception image sensing signal and the power noise signal, in a manner of differential amplification
And the step of generating difference filtering signal, is preferably comprised: using a first capacitor, having first capacitor value C1, samples and store up
Deposit the image sensing signal；Using another first capacitor, there is first capacitor value C1, sample and store the power noise signal；
Using two differential input ends of a difference amplifier, the image sensing signal and the power noise signal are received respectively；And benefit
The pressure differential deltap V between two difference output ends of the difference amplifier is used to filter signal as the difference；Wherein, one second capacitor,
With the second capacitance C2, be coupled to receive the image sample signal the differential input end and wherein difference output end it
Between；Wherein, another second capacitor has the second capacitance C2, is connected to the Differential Input for receiving the power noise signal
Between end and another difference output end；Wherein, the value of pressure differential deltap V are as follows:
Wherein the image sensing signal has voltage Vin, and the power noise signal has voltage Vip.
Preferably implement in kenel wherein a kind of, the reception difference filters signal, and generates a step for counting signal
Suddenly including the use of a hysteresis comparator, there are two magnetic hysteresis input terminals, be respectively coupled to two difference output end, and according to the pressure difference
Δ V and a ramp voltage and a reference voltage, generate the counting signal.
Preferably implement in kenel wherein a kind of, the sensing power noise, the step of to generate the power noise signal
It include: in the way of shading or in the way of being not turned on a transfer switch, to generate the power noise signal.
Below by specific embodiment elaborate, when be easier to understand the purpose of the present invention, technology contents, feature and its
The effect of reached.
Detailed description of the invention
Fig. 1 shows a kind of typical 1 schematic diagram of CMOS image sensing array circuit；
Fig. 2 shows one embodiment of the invention；
Fig. 3 shows second embodiment of the invention；
Fig. 4 illustrates that difference amplifier A1 grasps image sensing signal ISS and power noise signal PNS in second embodiment
Make the mode of operation；
Fig. 5 illustrates the mode of 41 operation of comparator in second embodiment；
Fig. 6 shows third embodiment of the invention.
Symbol description in figure
1 CMOS image sensing array circuit
2 image sensing arrays
3 column (row) circuits
4 rows (column) circuit
10 image sensing units
20 power noise sensing units
30 differential amplifier circuits
40 analog-to-digital conversion circuits
41 comparators
43 counting circuits
The 100 image sensing circuits with power noise filtering function
A1 difference amplifier
A2 hysteresis comparator
C1, C2 capacitance
CS counts signal
DIS1, DIS2 digitized video signal
Fd floating diffusion nodes
ISS image sensing signal
Pd light detecting unit
PNS power noise signal
RSEL column select switch
RST Resetting Switching
SF source follower
SH1, SH2, SH3, SH4 sample-and-hold circuit
TG transfer switch
VDAC ramp voltage
Vdd builtin voltage
Vin, Vip, Von, Vop voltage
VREF reference voltage
Δ V pressure difference
Specific embodiment
Referring to Fig. 2, one embodiment that display is of the invention.As shown in Fig. 2, the shadow with power noise filtering function
As sensing circuit 100 includes image sensing unit 10, power noise sensing unit 20, differential amplifier circuit 30 and simulation number
Word conversion circuit 40；Wherein digital conversion circuit 40 includes comparator 41 and counting circuit 43.Image sensing unit 10 to
Image is received, to generate image sensing signal ISS.Power noise sensing unit 20 is to sense power noise, to generate power
Noise warning signal PNS.Differential amplifier circuit 30 is coupled with image sensing unit 10 and power noise sensing unit 20 respectively, to receive
Image sensing signal ISS and power noise signal PNS, and difference filtering signal is generated in a manner of differential amplification.Simulation numeral
Conversion circuit 40 and differential amplifier circuit 30 couple, and to receive difference filtering signal, and generate digitized video signal DIS2.Compare
Device 41 and differential amplifier circuit 30 couple, and to receive difference filtering signal, and generate and count signal.Counting circuit 43 and comparator
41 couplings, will count signal and be converted to digitized video signal DIS2.
In the present embodiment, differential amplifier circuit 30 and analog-to-digital conversion circuit 40 for example can be applied to typically
Row circuit 4 in CMOS image sensing array circuit 1, and image sensing unit 10 and power noise sensing unit 20 for example can be with
Applied to the image sensing array 2 in typical CMOS image sensing array circuit 1.Wherein, power noise sensing unit 20
Every a line such as in image sensing array 2 is arranged one.Unlike the prior art, implementation of the invention is being applied
In example, image sensing signal ISS first passes through differential amplifier circuit 30, is reconverted into digitized video signal DIS2.Such framework is excellent
In place of the prior art, one of them is that image sensing signal ISS before being converted to digitized video signal DIS2, is first passed through
Differential amplifier circuit 30 and comparator 41, that is, before being converted to digitized video signal DIS2, first pass through differential amplification side
Formula filtering power noise simultaneously amplifies signal.In this way, subsequent conditioning circuit can be reduced in design, such as precision, resolution ratio
Limitation.That is, amplifying after image sensing signal ISS is removed at least part of power noise PNS, signal can be made to exist
In fixed preset range, resolution ratio increases, and reduces the complexity of the circuit of subsequent processing digital signal in design, improves news
Number resolution ratio.In addition, according to the present invention, power noise sensing unit 20 is such as, but not limited to by image in the way of shading
Masking, or the transfer switching switch in image sensing unit is not turned on, only transmit the image sensing unit of power noise.With
For 4- switchs (4T) Image Sensor, such as by its image sensing unit shading, or keep transfer switching switch therein permanent
It is not turned on.To be represented caused by this power noise sensing unit 20 the power noise signal PNS of power noise with it is aforementioned
The operation of image sensing signal ISS execution differential amplification.In addition, can be further in difference by the mode of image sensing unit shading
Divide in the processing routine of amplification mode, making power noise includes at least part of dark current, to convert in image sensing signal ISS
Before digitized video signal DIS2, filtering includes the power noise of at least part of dark current.
Fig. 3 shows second embodiment of the invention.The present embodiment shows the image sense with power noise filtering function
A kind of more specific embodiment of slowdown monitoring circuit 100.As shown in figure 3, image sensing unit 10 includes: Image Sensor pd, example
It is such as, but not limited to, optical diode, photogate or optical conductor, to receive image to generate sensing charge；Transfer switching switch
TG is coupled between Image Sensor pd and floating diffusion nodes fd, to shift above-mentioned sensing charge as floating diffusion charge,
And floating diffusion charge is stored in floating diffusion nodes fd；Resetting Switching RST, in the present embodiment, Resetting Switching RST and floating
Dynamic diffusion node fd coupling, Resetting Switching RST are such as but unlimited resetting the level of floating diffusion nodes fd to preset potential
In for builtin voltage Vdd；Source follower SF, is coupled to floating diffusion nodes fd, and floating diffusion charge is converted to a picture
Plain signal, to represent the image that the Image Sensor is sensed；And column select switch RSEL, it is coupled to source follower
SF, column select switch RSEL are controlled by column selection signal, with enable column select switch RSEL and receive signal, and by aforementioned picture
Plain signal is converted to image sensing signal ISS.
As shown in figure 3, power noise sensing unit 20 is for example with structure identical with image sensing unit 10, but wherein
Transfer switching switch TG keep the state being not turned in operation；Or in a manner of shielding, hidden for Image Sensor pd
Light, such as in manufacture of semiconductor, Image Sensor pd is covered with metal or the material of shading, makes image will not be by image sense
Element pd is surveyed to receive.Another embodiment, i.e. transfer switching switch TG keep being not turned on when operation, in this way, power
Power noise signal PNS caused by noise sensing unit 20 only has power noise.Another embodiment, i.e. transfer switching are opened
It closes TG to be held in operation, but with shielding mode, receive image will not by Image Sensor pd, in this way,
Power noise further includes dark current (dark current), connects image sensing signal ISS caused by dark current
Noise deducts together.
As shown in figure 3, differential amplifier circuit 30 include difference amplifier A1 and sample-and-hold circuit SH1, SH2, SH3 and
SH4.Sample-and-hold circuit SH1 and image sensing unit 10 couple, to sample and store image sensing signal ISS.Sampling is protected
It holds circuit SH2 and power noise sensing unit 20 couples, to sample and store power noise signal PNS.Difference amplifier A1
With two differential input ends and two difference output ends.Wherein two differential input ends respectively to receive image sensing signal ISS with
Power noise signal PNS.Pressure differential deltap V between two difference output ends filters signal as difference.Sample-and-hold circuit SH3 is connected to
Receive the differential input end of image sensing signal ISS and wherein between a difference output end.Sample-and-hold circuit SH4, which is connected to, to be connect
Between the differential input end and another difference output end for receiving power noise signal PNS.
Wherein, sample-and-hold circuit SH1, SH2, SH3 and SH4 is such as, but not limited to include capacitor as shown in the figure.It is taking
It can also include Resetting Switching and resetting capacitor etc. other than capacitor in sample holding circuit SH1, SH2, SH3 and SH4, with
It is used as temporary signal is reset, this is well known to those skilled in the art, and it will not be described here.In short, sampling keeps electricity
The operation on road is to sample and keep image sensing signal ISS or power noise signal PNS, keeps difference amplifier A1 right
Image sensing signal ISS and power noise signal PNS operation.
In detail, referring to Fig. 4, illustrating that difference amplifier A1 makes an uproar to image sensing signal ISS and power in the present embodiment
The mode of audio communication PNS operation.As shown, sample-and-hold circuit SH1 and sample-and-hold circuit SH2 are respectively provided with electricity
Hold, such as is respectively provided with capacitor with capacitance C1, sample-and-hold circuit SH3 and sample-and-hold circuit SH4, such as with capacitor
Value C2, the then value of pressure differential deltap V are as follows:
Wherein image sensing signal ISS has voltage Vin, and power noise signal PNS has voltage Vip.In this difference
The control mode that amplifier A1 is intended with negative feedback, establishes bias point, and making difference filtering signal (is herein image for Δ V)
The difference of signal ISS and power noise signal PNS are sensed with capacitance C1 and C2 ratio enlargement.Image sensing signal ISS and function
The signal value of rate noise warning signal PNS initial phase can be considered is stored in input lateral capacitance in, until image sensing signal ISS with
When the signal value of power noise signal PNS next phase generates, initial signal value is stored in the capacitor of outlet side；Cause
This causes the ratio of image sensing signal ISS and power noise signal PNS differential amplification using the ratio of capacitance C1 and C2.
It should be noted that in the present embodiment, the double input end of difference amplifier A1 and the sign of double output ends can be interchanged, but need
Keep corresponding relationship, that is to say, that keep pressure differential deltap V=Vop-Von as illustrated in the drawing, and meet foregoing pressure differential Δ
The calculating formula of the value of V.Wherein, the positive output end of difference amplifier A1 and the voltage value of negative output terminal be respectively voltage Vop with
Von；And the positive input terminal of difference amplifier A1 and the voltage value of negative input end are respectively the voltage Vip and Vin sampled after keeping.
As shown in figure 5, difference filtering signal (is the signal of both-end for pressure differential deltap V), by comparator 41 in the present embodiment
It is received.Wherein, comparator 41 such as, but not limited to includes hysteresis comparator A2, has two magnetic hysteresis input terminals, is respectively coupled to
In two difference output ends, and according to pressure differential deltap V and ramp voltage VDAC and reference voltage VREF, generates and count signal CS.Wherein,
Comparator 41 for example further includes capacitor and switch as shown in the figure, and capacitor therein is respectively to defeated as hysteresis comparator A2 two
Enter the application element thereof of the partial pressure relationship in parallel at end；And the time point to determine negative feedback operation is switched, so that comparing in magnetic hysteresis
Device A2 can be by the pressure difference of the input point of both-end, according to ramp voltage VDAC and reference voltage VREF, and metrological operation, which calculates, counts news
Number AIS.
In detail, consider that voltage Vop and Von is respectively as follows:
Wherein voltage Vaz is opposite level, can be considered that zero potential corrects (auto-zero) current potential, that is, magnetic when balance
The level of stagnant two input terminal of comparator A2.Illustrate operation since in the present embodiment, voltage Vaz is only used for facilitating, it is actual
Value does not need particularly to be illustrated.Therefore major emphasis is that comparator 41 is needed both-end representated by pressure differential deltap V
Difference filters signal, quantifies and is converted to single-ended counting signal CS.Using ramp voltage VDAC and reference voltage VREF respectively with
Voltage Vop counts up to voltage by ramp voltage VDAC compared with Von, such as in the positive input terminal of hysteresis comparator A2 down
Vop, that is, voltageAnd in the negative input end in hysteresis comparator A2, it is up counted by reference voltage VREF
To voltage Von i.e. voltageFor example, reference voltage VREF is fixed level, and ramp voltage
VDAC has the level for gradually changing (such as being gradually reduced) of single-slope, in this way, utilize two input end capacitors partial pressure
Relationship, the generated signal CS that counts of the mono- output end of hysteresis comparator A2 can represent both-end difference mistake representated by pressure differential deltap V
Filter the variable of signal.It counts signal CS and can be exchanged into digitized video signal DIS2 by counting circuit 43 shown in Fig. 2.Its
In, counting circuit 43 in hysteresis comparator A2 according to ramp voltage VDAC and reference voltage VREF in programs several up and down, meter
The related signal calculating its time or counting up and down, and obtain counting signal CS, this is well known to those skilled in the art, herein not
It gives and repeating.
Fig. 6 shows third embodiment of the invention.The vertical view of the present embodiment illustration power noise sensing unit 20
Schematic diagram.As shown in fig. 6, Image Sensor pd is such as, but not limited to optical diode, by overlooking diagram, for example (,) but it is unlimited
In for rectangle.And shift switching switch TG, diffusion node fd, Resetting Switching RST, source follower SF, column select switch RSEL
Such as, but not limited to the layout type arrangement of schematic top plan view shown in fig. 6.Image Sensor pd is filled up so that grey is solid,
Image Sensor pd is covered in signal in the way of shading, to generate power noise signal.Or will transfer switching switch TG in
It keeps being electrically connected to during operation being not turned on voltage, is not turned on transfer switching switch TG, to generate power noise signal.
Illustrate the present invention for preferred embodiment above, it is only described above, only make those skilled in the art easy
In the understanding contents of the present invention, interest field not for the purpose of limiting the invention.Under same spirit of the invention, this field skill
Art personnel can think and various equivalence changes.For example, can be inserted into does not influence signal major significance in shown each embodiment circuit
Element, such as other switches；For another example, it is regarded by top view, image sensing unit is not limited to shape as shown in the figure, can also
For other arbitrary shapes and other quantity.Therefore, the scope of the present invention should cover above and other all equivalence changes.
Claims (7)
1. a kind of image sensing circuit with power noise filtering function, characterized by comprising:
One image sensing unit, to sensing image, to generate an image sensing signal；
One power noise sensing unit, to sense power noise, to generate a power noise signal；
One differential amplifier circuit couples respectively with the image sensing unit and the power noise sensing unit, to receive the image
Signal and the power noise signal are sensed, and generates difference filtering signal in a manner of differential amplification；And
One analog-to-digital conversion circuit is coupled with the differential amplifier circuit, to receive difference filtering signal, and generates a number
Image signal, the analog-to-digital conversion circuit include:
One comparator is coupled with the differential amplifier circuit, to receive difference filtering signal, and is generated one and is counted signal；And
One counting circuit couples with the comparator, which is converted to the digitized video signal；
Wherein, which includes:
One first sample-and-hold circuit is coupled with the image sensing unit, to sample and store the image sensing signal；
One second sample-and-hold circuit is coupled with the power noise sensing unit, to sample and store the power noise signal；
One difference amplifier, comprising:
Two differential input ends, respectively to receive the image sensing signal and the power noise signal；And
Two difference output ends, the pressure differential deltap V between two difference output end filter signal as the difference；
One third sample-and-hold circuit, be connected to receive the image sensing signal the differential input end difference is defeated with wherein one
Between outlet；And
One the 4th sample-and-hold circuit is connected to the differential input end and another difference output for receiving the power noise signal
Between end.
2. as described in claim 1 with the image sensing circuit of power noise filtering function, wherein first sampling is kept
Circuit and second sample-and-hold circuit are respectively provided with a first capacitor, and with first capacitor value C1, third sampling is kept
Circuit and the 4th sample-and-hold circuit are respectively provided with one second capacitor, have the second capacitance C2, the value of pressure differential deltap V
Are as follows:
Wherein the image sensing signal has voltage Vin, and the power noise signal has voltage Vip.
3. as described in claim 1 with the image sensing circuit of power noise filtering function, wherein the Analog-digital Converter
Circuit includes a hysteresis comparator, has two magnetic hysteresis input terminals, is respectively coupled to two difference output end, and according to the pressure differential deltap
V and a ramp voltage and a reference voltage, generate the counting signal.
4. as described in claim 1 with the image sensing circuit of power noise filtering function, wherein power noise sensing
Unit is in the way of shading or in the way of being not turned on a wherein transfer switch, to generate the power noise signal.
5. a kind of control method of the image sensing circuit with power noise filtering function, characterized by comprising:
Sensing image, to generate an image sensing signal；
Power noise is sensed, to generate a power noise signal；
The image sensing signal and the power noise signal are received, difference filtering signal is generated in a manner of differential amplification；
Difference filtering signal is received, and generates one and counts signal；And
The counting signal is converted into a digitized video signal；
Wherein, the reception image sensing signal and the power noise signal generate difference filtering in a manner of differential amplification
The step of signal includes:
Using a first capacitor, there is first capacitor value C1, sample and store the image sensing signal；
Using another first capacitor, there is first capacitor value C1, sample and store the power noise signal；
Using two differential input ends of a difference amplifier, the image sensing signal and the power noise signal are received respectively；With
And
Signal is filtered using the pressure differential deltap V between two difference output ends of the difference amplifier as the difference；
Wherein, one second capacitor has the second capacitance C2, is coupled to the differential input end for receiving the image sample signal
Between wherein one difference output end；
Wherein, another second capacitor has the second capacitance C2, is connected to the Differential Input for receiving the power noise signal
Between end and another difference output end；
Wherein, the value of pressure differential deltap V are as follows:
Wherein the image sensing signal has voltage Vin, and the power noise signal has voltage Vip.
6. the control method of the image sensing circuit with power noise filtering function as claimed in claim 5, wherein this connects
Difference filtering signal is received, and the step of generating a counting signal includes: to have the input of two magnetic hysteresis using a hysteresis comparator
End, is respectively coupled to two difference output end, and according to pressure differential deltap V and a ramp voltage and a reference voltage, generate the meter
Digital communication number.
7. the control method of the image sensing circuit with power noise filtering function as claimed in claim 5, wherein the sense
Power scale noise includes: in the way of shading or in the way of being not turned on a transfer switch by the step of generating the power noise signal,
To generate the power noise signal.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1612590A (en) * | 2003-10-27 | 2005-05-04 | 松下电器产业株式会社 | Noise removing device for image sensor |
| TW201447860A (en) * | 2013-06-12 | 2014-12-16 | Sony Corp | Comparator circuit, a/d conversion circuit, and display device |
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| TWI382758B (en) * | 2008-03-28 | 2013-01-11 | Novatek Microelectronics Corp | Correlated double sampling circuit and cmos image sensor unit |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1612590A (en) * | 2003-10-27 | 2005-05-04 | 松下电器产业株式会社 | Noise removing device for image sensor |
| TW201447860A (en) * | 2013-06-12 | 2014-12-16 | Sony Corp | Comparator circuit, a/d conversion circuit, and display device |
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