CN104571645B - Image sensor apparatus and the optical navigator using this Image sensor apparatus - Google Patents
Image sensor apparatus and the optical navigator using this Image sensor apparatus Download PDFInfo
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- CN104571645B CN104571645B CN201310503621.7A CN201310503621A CN104571645B CN 104571645 B CN104571645 B CN 104571645B CN 201310503621 A CN201310503621 A CN 201310503621A CN 104571645 B CN104571645 B CN 104571645B
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- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
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Abstract
The invention discloses a kind of Image sensor apparatus and using the optical navigator of this Image sensor apparatus, wherein Image sensor apparatus includes sensor pixel and control circuit.Sensor pixel is included：Charge storage cell；Photoinduction element, produces the photoinduction electric charge of first, second photoinduction amount of charge of tool under first, second pattern respectively；And switch element, determine that the photoinduction electric charge can be sent to the amount of charge of the charge storage cell according to control voltage.Control circuit produces the control voltage, the amount of charge that the photoinduction electric charge is sent to the charge storage cell under the first mode is enabled to be first amount of charge, and the amount of charge that the photoinduction electric charge can be sent to the charge storage cell under the second mode is second amount of charge, wherein first amount of charge and second amount of charge are respectively less than the maximum charge stored number of the charge storage cell.
Description
Technical field
The present invention relates to a kind of Image sensor apparatus and using this Image sensor apparatus optical navigator, especially
About a kind of Image sensor apparatus for avoiding overexposure and the optical navigator for using this Image sensor apparatus.
Background technology
Existing optical navigator (such as optical mouse or optical touch control apparatus) is all to produce light to shine with a light source
Penetrate object (such as finger, stylus, or optical navigator place surface), then with an Image sensor apparatus capture wrap
Multiple picture frames of the image containing object calculate the position of object.Erroneous judgement is caused in order to avoid the interference of ambient light, wherein one
It is to close light source and capture a picture frame to plant way, then again opens light source and captures a picture frame, two picture frames are subtracted each other
Just the picture frame under only light source light irradiation can be calculated, to increase the accuracy for judging object's position.Image sensor apparatus can be wrapped
Containing multiple sensor pixels, to produce image sensing signal according to the light sensed, and these image sensing signals are by follow-up
Foregoing picture frame can be produced after processing.Fig. 1 depicts the circuit diagram of section senses dot structure in the prior art.As shown in figure 1,
A photoinduction element PD (such as optical diode) and charge storage cell C (such as electric capacity) can be included in sensor pixel 100.
Photoinduction element PD can produce electric charge according to the light received and be stored in charge storage cell C.
Fig. 2 is depicted in the prior art, when light source is opened and when closing, and charge storage cell stores showing for photoinduction electric charge
It is intended to.As shown in Fig. 2 when Fig. 1 light source LS is closed, photoinduction element PD generates photoinduction amount of charge according to ambient light
CRePhotoinduction electric charge (being represented with white circle), these photoinduction electric charges can be sent to charge storage cell C and be stored.
And when Fig. 2 light source LS is opened, photoinduction element PD generates light according to the light source light that ambient light and light source LS are sent
Charge inducing quantity CRe+CRLPhotoinduction electric charge (the photoinduction electric charge produced by light source light is represented with black round dot), these
Photoinduction electric charge can also be sent to charge storage cell C and be stored.Light source open and close photoinduction electric charge can respectively by
Read and produce image sensing signal according to this, then produce picture frame according to this again.And subtract each other the picture frame produced under this two state, just
Picture frame during only light source light can be obtained.
However, when ambient light is too strong, it is possible to influence the accuracy of abovementioned steps.Fig. 3 is depicted in the prior art, ring
Border light is too strong and causes photoinduction electric charge to be more than showing for maximum charge stored number (the i.e. so-called overexposure) of charge storage cell
It is intended to.As shown in figure 3, when ambient light is quite strong, it is possible to the photoinduction electricity for making photoinduction element PD be produced according to ambient light
The amount of charge of lotus (being represented with white circle) exceeds the maximum charge stored number of electric capacity.Or, photoinduction element PD according to
Maximum charge stored number of the amount of charge without departing from electric capacity for the photoinduction electric charge (being represented with white circle) that ambient light is produced,
But the photoinduction electric charge produced according to ambient light is plus the photoinduction electric charge (being represented with black round dot) according to produced by light source light
Total electrical charge quantity exceed electric capacity maximum charge stored number.Under both situations, it can not all obtain correctly only having light source
The picture frame of light time.
The content of the invention
Therefore, a purpose of the invention is to disclose a kind of Image sensor apparatus, and it can avoid picture frame overexposure in the prior art
Problem.
The present invention is another object is that disclose a kind of optical navigator, and it can calculate object by the picture frame of non-overexposure
Relative displacement.
One embodiment of the invention discloses Image sensor apparatus, includes sensor pixel and control circuit.Sensor pixel bag
Contain：Charge storage element；Light sensing component, produces the first photoinduction amount of charge according to the light quantity received in the flrst mode
Electric charge, and the electric charge of the second photoinduction amount of charge is produced according to the light quantity that is received under the second mode, wherein this second
Photoinduction amount of charge is more than the first photoinduction amount of charge；And switch module, the photoinduction is determined according to control voltage
Component can be sent to the amount of charge of the charge storage element；And control circuit, to produce the control voltage so that this
The amount of charge that the photoinduction electric charge can be sent to the charge storage element under one pattern is the first amount of charge, and second mould
The amount of charge that the photoinduction electric charge can be sent to the charge storage element under formula is the second amount of charge, wherein first electric charge
Quantity is that the first photoinduction amount of charge subtracts a tricharged quantity, and second amount of charge is the second photoinduction electric charge
Quantity subtracts the tricharged quantity；Wherein first amount of charge and second amount of charge is respectively less than the charge storage element
Maximum charge stored number.When tricharged quantity herein is switch module part conducting, charge storage element is not flowed into
Photoinduction electric charge quantity, detailed description will be illustrated down below.
Another embodiment of the present invention discloses a kind of optical navigator, contains Image sensor apparatus, light source and place
Manage unit.Image sensor apparatus produces the second shadow in producing the first image sensing signal under first mode under the second mode
As sensing signal, sensor pixel and control circuit are included.Sensor pixel is included；Charge storage element；Light sensing component,
The electric charge of the first photoinduction amount of charge is produced under one pattern according to the light quantity received, and foundation is received under the second mode
Light quantity produce the second photoinduction amount of charge electric charge, wherein the second photoinduction amount of charge be more than first photoinduction electricity
Lotus quantity；Switch module, determines that the light sensing component can be sent to the amount of charge of the charge storage element according to control voltage；
And image sensing signal generating circuit, to produce image sensing news according to the electric charge stored in the charge storage element
Number；And control circuit, to produce the control voltage so that the photoinduction electric charge can be sent to the electric charge under the first mode
The amount of charge of storage assembly is the first amount of charge, and the photoinduction electric charge can be sent to electric charge storage under the second mode
The amount of charge of component is the second amount of charge, and wherein first amount of charge is that the first photoinduction amount of charge subtracts the 3rd
Amount of charge, second amount of charge is that the second photoinduction amount of charge subtracts the tricharged quantity；Wherein this first electricity
Lotus quantity and second amount of charge are respectively less than the maximum charge stored number of the charge storage element, and the image sensing signal
Generation circuit produces the first image sensing signal and according to second electricity according to the photoinduction electric charge of first amount of charge
The photoinduction electric charge of lotus quantity produces the second image sensing signal.Light source under first mode in not lighting, and in the second mould
The light that at least some for accounting for second light quantity is provided under formula gives the light sensing component.Processing unit is by the second image sensing signal
The first image sensing signal is subtracted to calculate movement of the optical navigator relative to an object.Control circuit can be integrated
In processing unit.
By foregoing embodiment, prior art ambient light can be avoided too strong and the problem of overexposure.And pass through feedback machine
Make and can freely set the mechanism of control voltage, the switch that can be allowed in inducing pixel has more appropriate conducting degree.
Brief description of the drawings
Fig. 1 depicts the circuit diagram of section senses dot structure in the prior art.
Fig. 2 is depicted in the prior art, when light source has a unlatching and when closing, charge storage cell storage photoinduction electric charge
Schematic diagram.
Fig. 3 is depicted in the prior art, and ambient light is too strong and causes photoinduction electric charge to be more than the maximum of charge storage cell
The schematic diagram of electric charge stored number.
Fig. 4 and Fig. 5 depict the circuit diagram of Image sensor apparatus according to embodiments of the present invention.
Fig. 6 depicts the action schematic diagram of the Image sensor apparatus shown in Fig. 4.
Fig. 7 and Fig. 8 depict the block diagram of optical navigator according to embodiments of the present invention.Wherein, reference is said
It is bright as follows：
100 sensor pixels
400th, 701,801 Image sensor apparatus
401 image sensing matrixes
402 control circuits
403 signal read circuits
405 amplifiers
407 analog-digital converters
409 feedback circuits
411 ambient light sensing devices
501 image sensing signal generating circuits
700 optical navigators
800 optical mouse
703rd, 803 processing unit
SWR1、SWR2Reset element
C charge storage cells
PIX sensor pixels
PD photoinduction elements
SWTSwitch element
T1、T2Transistor
LS light sources
Sr surfaces
SR1、SR2、SRnSignal sensing element
Embodiment
Fig. 4 and Fig. 5 depict the circuit diagram of Image sensor apparatus according to embodiments of the present invention.But please note that Fig. 4 and Fig. 5
Structure only to illustrate, be not limited to the present invention.As shown in figure 4, Image sensor apparatus 400 contains image sensing square
Battle array 401, control circuit 402, signal read circuits 403, amplifier 405 and analog-digital converter 407.Image sensing matrix
401 have at least one sensor pixel PIX11-PIXnm.These sensor pixels PIX11-PIXnmAccording to the image production sensed
Raw at least one image sensing signal IS11-ISnm.Signal read circuits 403 are to read image sensing signal IS11-ISnm.Put
Big device 405 is used to image sensing signal IS according at least one amplifying parameters11-ISnmZoom into image sense after an amplification
Survey signal AIS11-AISnm.Analog-digital converter 407 to will amplification after image sensing signal AIS11-AISnmIt is converted into numeral
Image sensing signal DAIS after amplification11-DAISnm, the image sensing signal after these numerals constitutes picture frame.But please note that shadow
As sensing device further 400 can not include amplifier 405 yet.The digital radiograph sense of analog-digital converter 407 in the case of this
Survey signal IS11-ISnm.Control circuit 402 gives sensor pixel PIX to produce control voltage CV11-PIXnmIn at least one.
Fig. 5 depicts more detailed sensor pixel structure.As shown in figure 5, sensor pixel PIX according to embodiments of the present invention
Contain a charge storage cell C, a photoinduction element PD and a switch element SWT.Control what circuit 402 was produced
Control voltage CV can be sent to switch element SWTControl end, switch element SWTControl voltage CV value can be corresponded to and determined
How many electric charges can flow to charge storage cell C.In addition, sensor pixel PIX can further comprise that resets an element SWR2, it is used to
Reset photoinduction element PD.
Fig. 6 depicts the action schematic diagram of the Image sensor apparatus shown in Fig. 5.As shown in fig. 6, when light source is closed, sense
Element PD is answered to produce the first photoinduction amount of charge CR according to ambient lightPS1Photoinduction electric charge (being represented with white circle), when
Switch element SWTWhen not turning on, photoinduction electric charge can't flow into charge storage cell C.And as switch element SWTBy control electricity
Press CV control and it is partially ON when, have a tricharged quantity CR3Photoinduction electric charge do not flow into charge storage cell C,
Therefore its quantity of inflow charge storage cell C photoinduction electric charge is CRPS1-CR3(it is referred to as the first amount of charge CR1).Work as light source
During unlatching, sensing element PD can produce the second photoinduction amount of charge CR according to ambient light and light source lightPS2Photoinduction electric charge
(being represented according to the photoinduction electric charge that the light of light source is produced with black round dot), wherein the second photoinduction amount of charge CRPS2=the first
Photoinduction amount of charge CRPS1+ photoinduction electric charge incrementss CRL.As switch element SWTWhen not turning on, photoinduction electric charge can't
Flow into charge storage cell C.And as switch element SWTControlled by control voltage CV and it is partially ON when, still have tricharged
Quantity CR3 photoinduction electric charge does not flow into charge storage cell C, therefore flows into charge storage cell C photoinduction electric charge its number
Amount is CRPS2-CR3(it is referred to as the second amount of charge CR2).Will be according to the second amount of charge CR2Photoinduction electric charge produce image
Sensing signal is subtracted according to the first amount of charge CR1Photoinduction electric charge produce image sensing signal, just can obtain according only to
The image sensing signal that light source light is produced.So please note that, the tricharged quantity CR of lower section in the 6th figure3Although with white
Color round dot represents, its only to illustrate above and below tricharged quantity CR3It is consistent, and is not used to not flow into electricity below limitation
It is all the first original photoinduction amount of charge CR that charge storing element C is inevitablePS1Electric charge electric charge therein.
In the embodiment in fig 6, the first amount of charge CR1And the second amount of charge CR2Respectively less than charge storage cell C is most
Large charge stores number, thus do not have ambient light in the prior art it is too strong and the problem of cause overexposure.Also therefore charge storage cell C
Large Copacity can not be needed, charge storage cell C cost and shared area can be so reduced.If charge storage cell C is in itself
There is larger capacity, then by such way, can also reduce the signal noise ratio of image sensing signal.It is sayed in detail, in electricity
On the premise of charge storing element C capacity is enough big, in the way of prior art, because electric charge can flow into charge storage cell C entirely.
Therefore the photoinduction electric charge produced according to light source light can account for all electric chargesAnd in an embodiment of the present invention, according to light
The photoinduction electric charge that source light is produced can account for all electric charges
Therefore according to the way of the present invention, the photoinduction electric charge produced according to light source light and the image sensing signal that produces can occupy larger
Ratio, therefore the signal noise ratio of image sensing signal can be improved.
Fig. 5 please be return, sensor pixel PIX can further comprise an image sensing signal generating circuit 501, to root
An image sensing signal IS (i.e. image sensing signals in Fig. 4 are produced according to the photoinduction electric charge that is stored in charge storage cell C
IS11-ISnmOne of them).In one embodiment, image sensing signal generating circuit 501 resets element SWR comprising one1,
To reset charge storage cell C.In addition, image sensing signal generating circuit 501 further comprises transistor T1And T2。
Signal sensing element SR in signal read circuits 4031、SR2、SRnAn energy-storage travelling wave tube is respectively provided with, when control circuit 402 is with control
Signal CS processed makes transistor T2During conducting, the photoinduction electric charge in charge storage cell C will be via transistor T1It is converted into voltage,
And it is stored in signal sensing element SR1、SR2、SRnEnergy-storage travelling wave tube in.Those skilled in the art should can be appreciated that image in Fig. 5
The Detailed Operation of sensing signal generation circuit 501, therefore will not be repeated here.But please note that image sensing signal produces electricity in Fig. 5
The structure on road 501 only to illustrate, is not limited to the present invention.
Referring again to Fig. 4, a feedback circuit can be further comprised according to the Image sensor apparatus 400 of this case embodiment
409, can be according to the first photoinduction amount of charge CRPS1Or the second photoinduction amount of charge CRPS2With maximum charge stored number
Relation provides feedback information to control circuit 402 to adjust control voltage.That is tricharged quantity CR in adjustment Fig. 63Value, make
First amount of charge CR1With the second amount of charge CR2Maximum charge stored number without departing from charge storage cell C, but also will not
Because subtracting too many tricharged quantity CR3And have influence on correct judged result.For example, if light source is closed in Fig. 4
When the first amount of charge CR1Electric capacity C maximum charge stored number is exceeded, then it represents that ambient light is too strong so that light source is closed
Image still overexposure in the state of closing.Just control voltage CV must be adjusted under this situation so that pass through switch element SWTElectric charge
Quantity tails off (i.e. tricharged quantity CR3Become big).It can so allow the first amount of charge CR1Without departing from electric capacity C maximum charge
Situation of the stored number without having overexposure.Therefore, control circuit 402 adjusts control except the information according to feedback circuit 409
Outside voltage processed, also control voltage can be provided according to the ambient light information ELP of the offer of ambient light sensing device 411.This environment
Light sensing apparatus 411 is used to the intensity of sense ambient light and relevant information is supplied into control circuit 402.In addition, control circuit
402 can also receive from an outside control instruction to adjust the control voltage, you can voluntarily be set by manufacturer or user
It is fixed.But please note that control circuit 402, feedback circuit 409 and ambient light sensing device 411 are not necessarily intended to image sensing matrix
401 in same device, these elements can position in different devices.
Please note that foregoing Image sensor apparatus is not only useful on the optical navigator of light source, it is possible to use at it
In its device.Therefore it can be summarized as follows according to the Image sensor apparatus of this case embodiment：A kind of Image sensor apparatus is comprising at least
One sensor pixel and a control circuit.Sensor pixel is included：One charge storage cell；One photoinduction element,
The electric charge of a first photoinduction amount of charge is produced under one first mode according to the light quantity received, and in second mould
The electric charge of a second photoinduction amount of charge, wherein the second photoinduction amount of charge are produced under formula according to the light quantity received
More than the first photoinduction amount of charge；And a switch element, the photoinduction element energy is determined according to a control voltage
It is sent to the amount of charge of the charge storage cell；And a control circuit, to produce the control voltage so that this first
The amount of charge that the photoinduction electric charge can be sent to the charge storage cell under pattern is first amount of charge, and this second
The amount of charge that the photoinduction electric charge can be sent to the charge storage cell under pattern is second amount of charge, wherein this
One amount of charge is that the first photoinduction amount of charge subtracts a tricharged quantity, and second amount of charge is second light
Charge inducing quantity subtracts the tricharged quantity；Wherein first amount of charge and second amount of charge is respectively less than the electric charge
The maximum charge stored number of memory element.
Fig. 7 and Fig. 8 depict the block diagram of optical navigator according to embodiments of the present invention.As shown in fig. 7, optics is led
Boat device 700 contains an Image sensor apparatus 701, a processing unit 703 and a light source LS.Light source LS throws light
Object (being palm H in this example) is mapped to produce multiple picture frames.Image sensor apparatus 701 is to capture multiple picture frames, then
Processing unit 703 calculates palm H position or gesture motion according to these picture frames.Image sensor apparatus 701 contains foregoing
Sensor pixel structure in Fig. 5, and contain control circuit only light source light is tried to achieve according to foregoing picture frame calculation
Picture frame, so that palm H position or the judgement of gesture motion are more accurate.Fig. 8 then depicts an optical mouse 800, its
It is optical navigator one of which.As shown in figure 8, optical mouse 800 contains an Image sensor apparatus 801, at one
Manage unit 803 and a light source LS.It (is the table that optical mouse 800 is placed in this that light source LS, which projects light onto object,
Face Sr) to produce multiple picture frames.Image sensor apparatus 801 is to capture multiple picture frames, and then processing unit 803 is according to these figures
Frame calculates the corresponding surface Sr of optical mouse 800 movement.Image sensor apparatus 801 contains the sensing picture in earlier figures 5
Plain structure, and the picture frame of only light source light is tried to achieve by controlling circuit according to foregoing picture frame calculation, so that optics mouse
The calculating of relative movement between 800 and surface Sr of mark is more accurate.Control circuit can be incorporated into processing unit 703,803 or only
Stand on processing unit 703,803.Moreover, optical navigator 700 and optical mouse 800 can also include the feedback circuit in Fig. 4
409 and ambient light sensing device 411.
Please note that, Image sensor apparatus disclosed in this invention may be used at various optical navigator, however it is not limited to Fig. 7
With the optical navigator disclosed in Fig. 8.Therefore the optical guidance of Image sensor apparatus disclosed in this invention has been used to fill
Putting to be summarized as follows：A kind of optical navigator, contains an Image sensor apparatus, a light source and a processing single
Member.Image sensor apparatus produces a first image sensing signal under a first mode, and is produced under a second mode
A raw second image sensing signal, includes a sensor pixel and a control circuit.Sensor pixel is included；One electric charge
Memory element；One photoinduction element, the first photoinduction electricity is produced under a first mode according to the light quantity received
The electric charge of lotus quantity, and the electricity under a second mode according to light quantity one the second photoinduction amount of charge of generation received
Lotus, wherein the second photoinduction amount of charge are more than the first photoinduction amount of charge；One switch element, according to a control
Voltage determines that the photoinduction element can be sent to the amount of charge of the charge storage cell；And an image sensing signal is produced
Circuit, to produce an image sensing signal according to the electric charge stored in the charge storage cell；And a control
Circuit, to produce the control voltage so that the photoinduction electric charge can be sent to the charge storage cell under the first mode
Amount of charge is first amount of charge, and the photoinduction electric charge can be sent to the charge storage cell under the second mode
Amount of charge is second amount of charge, and wherein first amount of charge is that the first photoinduction amount of charge subtracts one
Tricharged quantity, second amount of charge is that the second photoinduction amount of charge subtracts the tricharged quantity；Wherein this first
Amount of charge and second amount of charge are respectively less than the maximum charge stored number of the charge storage cell, and the image sensing is believed
Number generation circuit according to the photoinduction electric charge of first amount of charge produce the first image sensing signal and according to this second
The photoinduction electric charge of amount of charge produces the second image sensing signal.Light source does not light in the flrst mode, and second
There is provided under pattern and account at least one of light of second light quantity and give the photoinduction element.Processing unit believes the second image sensing
Number subtract the first image sensing signal to calculate movement of the optical navigator relative to an object.Control circuit can
It is incorporated into processing unit.
By foregoing embodiment, prior art ambient light can be avoided too strong and the problem of overexposure.And pass through feedback machine
Make and can freely set the mechanism of control voltage, the switch that can be allowed in inducing pixel has more appropriate conducting degree.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (14)
1. a kind of Image sensor apparatus, it is characterised in that include：
Sensor pixel, comprising；
Charge storage cell；
Photoinduction element, produces the photoinduction electricity of the first photoinduction amount of charge according to the light quantity received in the flrst mode
Lotus, and produce the photoinduction electric charge of the second photoinduction amount of charge according to the light quantity that is received under the second mode, wherein this
Two photoinduction amount of charge are more than the first photoinduction amount of charge；And
Switch element, determines that the photoinduction electric charge can be sent to the amount of charge of the charge storage cell according to control voltage；
And
Circuit is controlled, to produce the control voltage so that the photoinduction electric charge can be sent to the electric charge and deposit under the first mode
The amount of charge for storing up element is the first amount of charge, and the photoinduction electric charge can be sent to electric charge storage member under the second mode
The amount of charge of part is the second amount of charge, and wherein first amount of charge is that the first photoinduction amount of charge subtracts the 3rd electricity
Lotus quantity, second amount of charge is that the second photoinduction amount of charge subtracts the tricharged quantity；
Wherein first amount of charge and second amount of charge are respectively less than the maximum charge stored number of the charge storage cell.
2. Image sensor apparatus as claimed in claim 1, it is characterised in that wherein maximum charge of the charge storage cell
Stored number is more than the second photoinduction amount of charge.
3. Image sensor apparatus as claimed in claim 1, it is characterised in that wherein the sensor pixel further comprises image sense
Signal generating circuit is surveyed, to produce image sensing signal according to the photoinduction electric charge stored in the charge storage cell.
4. Image sensor apparatus as claimed in claim 1, it is characterised in that further comprise feedback circuit, according to this first
The relation of photoinduction amount of charge or the second photoinduction amount of charge and the maximum charge stored number provide feedback information to
The control circuit, to adjust the control voltage.
5. Image sensor apparatus as claimed in claim 1, it is characterised in that further comprise ambient light sensing device, is used to
Sense ambient light adjusts the control voltage according to the environmental light parameter with generation environment optical parameter, the control circuit.
6. Image sensor apparatus as claimed in claim 1, it is characterised in that wherein the control circuit is received from outside control
System instructs to adjust the control voltage.
7. Image sensor apparatus as claimed in claim 1, it is characterised in that further comprise resetting element, couple the light sensation
Element is answered, to reset the photoinduction element according to reset signal.
8. a kind of optical navigator, it is characterised in that include；
Image sensor apparatus, produces the first image sensing signal in the flrst mode, and produces the second image under the second mode
Sensing signal, comprising；
Sensor pixel, comprising；
Charge storage cell；
Photoinduction element, produces the photoinduction electricity of the first photoinduction amount of charge according to the light quantity received in the flrst mode
Lotus, and the photoinduction electric charge of the second photoinduction amount of charge is produced according to the second light quantity received under the second mode, wherein
The second photoinduction amount of charge is more than the first photoinduction amount of charge；
Switch element, determines that the photoinduction element can be sent to the amount of charge of the charge storage cell according to control voltage；With
And
Image sensing signal generating circuit, to produce image sensing letter according to the electric charge stored in the charge storage cell
Number；And
Circuit is controlled, to produce the control voltage so that the photoinduction electric charge can be sent to the electric charge and deposit under the first mode
The amount of charge for storing up element is the first amount of charge, and the photoinduction electric charge can be sent to electric charge storage member under the second mode
The amount of charge of part is the second amount of charge, and wherein first amount of charge is that the first photoinduction amount of charge subtracts the 3rd electricity
Lotus quantity, second amount of charge is that the second photoinduction amount of charge subtracts the tricharged quantity；
Wherein first amount of charge and second amount of charge are respectively less than the maximum charge stored number of the charge storage cell,
And the image sensing signal generating circuit produces first image sensing according to the photoinduction electric charge of first amount of charge and believed
Number and the second image sensing signal is produced according to the photoinduction electric charge of second amount of charge；
Light source, does not light in the first mode, and provides account at least one of of second light quantity in this second mode
Light gives the photoinduction element；And
Processing unit, the second image sensing signal is subtracted the first image sensing signal to calculate the optical navigator
Relative to the movement of object.
9. optical navigator as claimed in claim 8, it is characterised in that wherein maximum charge of the charge storage cell
Stored number is more than the second photoinduction amount of charge.
10. optical navigator as claimed in claim 8, it is characterised in that further comprise feedback circuit, according to this first
The relation of photoinduction amount of charge or the second photoinduction amount of charge and the maximum charge stored number provide feedback information to
The control circuit, to adjust the control voltage.
11. optical navigator as claimed in claim 8, it is characterised in that further comprise ambient light sensing device, is used to
Sense ambient light adjusts the control voltage according to the environmental light parameter with generation environment optical parameter, the control circuit.
12. optical navigator as claimed in claim 8, it is characterised in that wherein the control circuit is received from outside
Control instruction adjusts the control voltage.
13. optical navigator as claimed in claim 8, it is characterised in that wherein the Image sensor apparatus further comprises
Element is reset, the photoinduction element is coupled, to reset the photoinduction element according to reset signal.
14. optical navigator as claimed in claim 8, it is characterised in that wherein the control is circuit integrated manages single in this place
In member.
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| CN201310503621.7A CN104571645B (en) | 2013-10-23 | 2013-10-23 | Image sensor apparatus and the optical navigator using this Image sensor apparatus |
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| CN201310503621.7A CN104571645B (en) | 2013-10-23 | 2013-10-23 | Image sensor apparatus and the optical navigator using this Image sensor apparatus |
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| CN104571645B true CN104571645B (en) | 2017-09-22 |
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Citations (7)
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