CN101917560B - Image sensor and electrifying self-resetting method thereof - Google Patents
Image sensor and electrifying self-resetting method thereof Download PDFInfo
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- CN101917560B CN101917560B CN201010245438.8A CN201010245438A CN101917560B CN 101917560 B CN101917560 B CN 101917560B CN 201010245438 A CN201010245438 A CN 201010245438A CN 101917560 B CN101917560 B CN 101917560B
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Abstract
The invention relates to an electrifying self-resetting method of an image sensor, which comprises the steps of: judging whether a line counter value and a row counter value of a digital logic circuit of the image sensor are in the specified numeric area or not, judging whether a state machine is in an appointed state or not; if either the line counter value or the row counter value exceeds the specified numeric area, regulating the line counter value or the row counter value in the next clock period into an initial value; and if the state machine is in the non-appointed state, regulating state of the state machine into the initial state. The embodiment of the invention also provides an image sensor. The embodiment of the invention realizes the electrifying self-resetting of the image sensor while achieving the purpose of not increasing the size of the image sensor.
Description
Technical field
The present invention relates to field of image sensors, particularly a kind of imageing sensor and imageing sensor digital logic module electrifying self-resetting technology.
Background technology
Along with the fast development of semiconductor technology, the size of imageing sensor is more and more littler, makes that imageing sensor has obtained using more widely.Imageing sensor is along with its size further reduces; Its operational environment becomes increasingly complex, the various system requirements that this just requires imageing sensor must flexible adaptation to face, for example; Be applied to the imageing sensor of medical instruments field; As be used for complementary metal oxide semiconductors (CMOS) (CMOS, the Complementary Metal-Oxide Semiconductor) imageing sensor of Medical Devices such as endoscope, observe the pathology situation in the human body owing to will stretch into; So not only require the encapsulation of cmos image sensor as far as possible little, and the size of its required circuit system is also as far as possible little.
Column counter in the imageing sensor digital logic module, linage-counter and state machine are after imageing sensor powers on; Column counter and linage-counter are written into random value; State machine is written into stochastic regime, so in the prior art, is the image sensor design reset pin; Rely on external printed circuit board (PCB; PrintedCircuit Board) setting up electrify restoration circuit on, is initial value and initial condition through after powering on, reset column counter, linage-counter and state machine of this pin, so that imageing sensor gets into normal operating conditions.
The inventor finds that there is following shortcoming at least in prior art in realizing process of the present invention:
Design in imageing sensor independently that reset pin is unfavorable for reducing image sensor size, more be unfavorable for cost control.
Summary of the invention
Technical problem to be solved by this invention is to provide the electrifying self-resetting method of a kind of imageing sensor and imageing sensor, when not increasing image sensor size, realizes electrifying self-resetting.
The objective of the invention is to realize through following technical scheme:
The technical scheme that the present invention takes comprises: a kind of imageing sensor electrifying self-resetting method is provided, after imageing sensor powers on, comprises:
Whether the value of column counter value and linage-counter of Digital Logical Circuits of judging said imageing sensor in the span of regulation, and judges whether state machine is in designated state;
If the span of any overshoot then is adjusted into initial value in next clock cycle with the value of the said column counter of correspondence or the value of linage-counter in the value of the value of said column counter and linage-counter;
If said state machine is in non-designated state, then said state machine is adjusted into initial condition.
Also comprise:
If the value of the value of column counter or linage-counter is in prescribed limit, then after the value sequential counting of the value of said column counter or linage-counter reaches the maximum of regulation respectively, be adjusted into initial value in next clock cycle respectively again.
The maximum of said regulation equals imageing sensor valid pixel array maximum.
The span of said regulation is the span between from the initial value to the maximum.
Said after next clock cycle is adjusted into initial value with the value of the said column counter of correspondence, also comprise:
Said state machine reads the value of adjusted said column counter, turns back to initial condition.
The designated state of said state machine comprises initial condition, data latching state and reset mode.
The embodiment of the invention also provides a kind of imageing sensor, comprising:
Judging unit is used for after imageing sensor powers on, and whether the value of column counter value and linage-counter of Digital Logical Circuits of judging said imageing sensor in prescribed limit, and judges whether state machine is in designated state;
The column counter control unit is used for when the span of the value overshoot of the said column counter of said judgment unit judges, in next clock cycle the value of said column counter is adjusted into initial value;
The linage-counter control unit is used for when the span of the value overshoot of the said linage-counter of said judgment unit judges, in next clock cycle the value of said linage-counter is adjusted into initial value;
The state machine control unit is used for when said state machine is in non-designated state, said state machine being adjusted into initial condition.
Said state machine control unit also is used for, and after said column counter control unit is adjusted into initial value with the value of said column counter, reads the value of said column counter, makes state machine turn back to initial condition.
Said column counter control unit; Also be used for value when the said column counter of said judgment unit judges in prescribed limit the time; After the value sequential counting of said column counter reaches the maximum of regulation, the value of said column counter is adjusted into initial value in next clock cycle;
Said linage-counter control unit; Also be used for value when the said linage-counter of said judgment unit judges in prescribed limit the time; After the value sequential counting of said linage-counter reaches the maximum of regulation, the value of said linage-counter is adjusted into initial value in next clock cycle.
Also comprise:
Information memory cell is used to be stored as the column counter maximum of the regulation that said imageing sensor is provided with and the linage-counter maximum and the span of span and regulation.
Technical scheme by the invention described above embodiment provides can be found out; Described imageing sensor electrifying self-resetting method of the embodiment of the invention and device pass through according to linage-counter; Whether the random value that column counter and state machine are written into meets predefined value; Automatically it is carried out reset operation, can omit the reset pin on the hardware, after the digital logic module of imageing sensor powers on, can realize at short notice at every turn from resetting; Recover the operate as normal of imageing sensor, realized when not increasing image sensor size, realizing the electrifying self-resetting of imageing sensor.
Description of drawings
Fig. 1 is an embodiment of the invention imageing sensor electrifying self-resetting method flow chart;
Fig. 2 is an embodiment of the invention imageing sensor electrifying self-resetting method state machine reset signal flipchart;
Fig. 3 is embodiment of the invention imageing sensor electrifying self-resetting method state machine signal condition figure;
Fig. 4 is an embodiment of the present invention image sensor architecture figure;
Fig. 5 is the another kind of embodiment image sensor architecture of the present invention figure.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The embodiment of the invention provides a kind of imageing sensor electrifying self-resetting method, referring to Fig. 1, after imageing sensor powers on, comprises the steps:
Step 10: whether the value of column counter value and linage-counter of Digital Logical Circuits of judging said imageing sensor in the span of regulation, and judges whether state machine is in designated state;
The said column counter of the embodiment of the invention is counted all row in each row under the imageing sensor normal operating conditions, and meter completely reaches the counting that begins all row of next line after the maximum again, simultaneously the linage-counter counting.When all row meters of a frame completely reach maximum, then begin the counting of next frame.Time for exposure and column counter state that said state machine is preset according to imageing sensor are selected current state is set from designated state, for example, send data latch signal to reading row, and the row that perhaps begins to make public to needs sends exposure electric charge clear signal etc.
In the imageing sensor power up, linage-counter and column counter are written into random value, and state machine gets into stochastic regime.The embodiment of the invention is provided with the counting maximum for column count and linage-counter in advance, and the interval value of definite column counter and linage-counter, promptly stipulates the span of column counter and linage-counter, and the designated state of definite state machine.The maximum of said regulation equals imageing sensor valid pixel array maximum; The span of said regulation is the span between from the initial value to the maximum.The designated state of state machine comprises initial condition, latch mode and reset mode.The state machine designated state comprises numerical value 0～25, wherein numerical value 0 expression initial condition; Numerical value 1～20 expression is used to control the data latch signal of pel array, and these signals comprise rstg, tg, and rowsel, rowsg, shs, shr, after these signal upsets got into pre-set high level or low level state, state machine was a latch mode; Numerical value 21～25 is used to control the reset signal of pel array, and these signals comprise rstg, tg, and after these signal upsets got into pre-set high level or low level state, state machine was a reset mode.The signal that is used to represent state machine can be set according to the pictures different transducer at place.
In step 10, whether the column counter value of the said Digital Logical Circuits of judging said imageing sensor and the value of linage-counter in the span of regulation, and judges whether state machine is in designated state; Comprise: step 10-1, whether the value of judging column counter is at the span and the step 10-2 of regulation; Whether the value of judging linage-counter is in the span of regulation; And step 10-3, judge that whether state machine is in designated state, that is to say; Judge random value that column counter and linage-counter be written into whether in the span of regulation, and whether the stochastic regime of state machine is in initial condition, latch mode and the reset mode any.
If judged result is that then execution in step 11; Otherwise execution in step 12; As shown in fig. 1, if the span of the value overshoot of said column counter, execution in step 11-1 then, otherwise execution in step 12-1; If the span of the value overshoot of linage-counter, execution in step 11-2 then, otherwise execution in step 12-2; If state machine is in non-designated state, execution in step 11-3 then, otherwise the completion that resets.
Wherein, whether whether the value of judging column counter do not have the sequencing restriction in the step whether regulation span and the state of judging state machine are in designated state in regulation span, the value of judging linage-counter.
Step 11: in next clock cycle the value of the said column counter of correspondence or the value of linage-counter are adjusted into initial value, state machine is adjusted into initial condition;
Wherein, step 11 comprises step 11-1, step 11-2 and step 11-3, promptly comprises: if step 11-1 the span of the value overshoot of said column counter, then is adjusted into initial value in next clock cycle with the value of column counter; If step 11-2 the span of the value overshoot of said linage-counter, then is adjusted into initial value in next clock cycle with the value of linage-counter; Step 11-3 if state machine is in non-designated state, then is adjusted into initial condition with said state machine.
Wherein, Because the value of column counter is depended in the upset of state machine, therefore after column counter was adjusted into initial value, said state machine read the value of adjusted said column counter; Because column counter has been adjusted into initial value, so state machine turns back to initial condition.Therefore behind execution in step 11-1, no matter whether the back state machine that powers on is in designated state, state machine all can be adjusted into initial condition according to the state of the column counter that is adjusted into initial condition.
Step 12: after the value sequential counting of the value of said column counter and linage-counter reaches the maximum of regulation respectively, be adjusted into initial value in next clock cycle respectively again.
Wherein, step 12 comprises: step 12-1 after the value sequential counting of said column counter reaches the maximum of regulation, is adjusted into initial value in next clock cycle again; Step 12-2 after the value sequential counting of said linage-counter reaches the maximum of regulation, is adjusted into initial value in next clock cycle again.
After linage-counter, column counter and state machine all are adjusted into initial value and initial condition, the imageing sensor completion that resets.
The said method of the embodiment of the invention is after the digital logic module of imageing sensor powers at every turn; According to linage-counter, whether the random value that column counter and state machine are written into meets predefined value, automatically it is carried out reset operation; Can in the short time, reset; Recover the imageing sensor operate as normal, omitted the reset pin on the hardware, realized when not increasing image sensor size, realizing the electrifying self-resetting of imageing sensor.
For further understanding the present invention, being applied to cmos image sensor with this method below is example, and the imageing sensor self-resetting method that the embodiment of the invention is proposed is elaborated.
With the valid pixel array is that 220 * 170 cmos image sensor is an example, and valid pixel array pixel number is all started at from 0 with the row pixel number.This imageing sensor column counter row_count maximum is 219, and the regulation span is 0 to 219, and initial value is 0.This imageing sensor linage-counter col_count maximum is 169, and the regulation span is 0 to 169, and initial value is 0.
This imageing sensor is powered on, in the power up, column counter, linage-counter and state machine are written into random value and stochastic regime.If the random value that column counter col_count is written into surpasses at 0～219 o'clock, column counter col_count will become 0 in the next clock cycle; When the random value that is written into as linage-counter row_count surpasses 0～169, linage-counter row_count will become 0 in the next clock cycle; Depend on the count value of col_count because of the upset of state machine signal_state, col_count becomes 0 like column counter, and then state machine signal_state also will get back to initial condition; The random value that is written into as column counter col_count and linage-counter row_count is all in the regulation span; And the state outside the regulation appears in the stochastic regime that state machine signal_state is written into; It is non-initial condition; When data latching state or reset mode, it adjusts to initial condition in next clock cycle with state machine, and the imageing sensor electrifying self-resetting finishes.
The random value that is written into as column counter col_count and linage-counter row_count is all in the regulation span; According to the imageing sensor operation principle; Column counter col_count and linage-counter row_count sequential counting respectively return initial value to maximum when surpassing the regulation span; State machine signal_state also will get back to initial condition after reading the count value of this column counter col_count.The imageing sensor electrifying self-resetting finishes.
Be illustrated in figure 2 as the emulation experiment design sketch, use verilog HDL language De $random system function random value after powering on to be set with the state of simulation real work as linage-counter row_count, column counter col_count and state machine signal_state.After imageing sensor powers on, use the method for electrifying self-resetting according to the invention, then column counter col_count returns initial value after counting up to 2f, and state machine signal_state also will get back to initial condition after reading the count value of column counter col_count.
Be illustrated in figure 3 as another emulation experiment design sketch, signal restg, tg, rowsel, rowsg, shs and shr are the control signal that this cmos image sensor digital logic module sends to pel array among the figure.The signal indication of having drawn together in the big dashed rectangle among the figure is according to the level upset situation of each signal this moment, and it is the data latching state that state machine state is set; The signal indication of having drawn together in the less dashed rectangle among the figure is according to the level upset situation of each signal this moment, and it is reset mode that state machine state is set; Electrifying self-resetting method according to the invention is used in the back that powers on, through to column counter, and the resetting of linage-counter and state machine, back imageing sensor entering normal operating conditions resets.When linage-counter row_count when 8 ' h81 is capable, state machine at first gets into the data latching state, shown in the big dashed rectangle of Fig. 3, after the column counter meter completely returned initial value, shown in the less dashed rectangle of Fig. 3, state machine got into reset mode.
The embodiment of the invention provides a kind of imageing sensor, and is as shown in Figure 4, comprising:
Judging unit 40 is used for after imageing sensor powers on, and whether the value of column counter value and linage-counter of Digital Logical Circuits of judging said imageing sensor in prescribed limit, and judges whether state machine is in designated state;
Column counter control unit 41 is used for when said judging unit 40 is judged the span of value overshoot of said column counter, in next clock cycle the value of said column counter is adjusted into initial value;
Linage-counter control unit 42 is used for when said judging unit 40 is judged the span of value overshoot of said linage-counter, in next clock cycle the value of said linage-counter is adjusted into initial value;
State machine control unit 43 is used for value at the value of said column counter and column counter in the span of regulation, and said state machine is adjusted into initial condition with said state machine when being in non-designated state.This state machine control unit 43 also is used for, and after said column counter control unit 42 is adjusted into initial value with the value of said column counter, reads the value of said column counter, makes state machine turn back to initial condition.
Said column counter control unit 41; The value that also is used for judging said column counter when said judging unit 40 is in prescribed limit the time; After the value sequential counting of said column counter reaches the maximum of regulation, the value of said column counter is adjusted into initial value at next hop cycle;
Said linage-counter control unit 42; The value that also is used for judging said linage-counter when said judging unit 40 is in prescribed limit the time; After the value sequential counting of said linage-counter reaches the maximum of regulation, the value of said linage-counter is adjusted into initial value at next hop cycle.
As shown in Figure 5, described imageing sensor can also comprise:
Information memory cell 44 is used to be stored as the span that said imageing sensor is provided with column counter maximum and linage-counter maximum and regulation.
The said imageing sensor of the embodiment of the invention; After powering at every turn; Can in the short time, realize resetting certainly of column counter, linage-counter and state machine; Thereby recover the imageing sensor operate as normal, omitted the reset pin on the hardware, realized when not increasing image sensor size, realizing the electrifying self-resetting of imageing sensor.
In sum; Described imageing sensor electrifying self-resetting method of the embodiment of the invention and device are according to linage-counter; Whether the random value that column counter and state machine are written into meets predefined value; Automatically it is carried out reset operation, can omit the reset pin on the hardware, after the digital logic module of imageing sensor powers on, can realize at short notice at every turn from resetting; Recover the operate as normal of imageing sensor, realized when not increasing image sensor size, realizing the electrifying self-resetting of imageing sensor.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. an imageing sensor electrifying self-resetting method is characterized in that, after imageing sensor powers on, comprising:
Whether the value of column counter value and linage-counter of Digital Logical Circuits of judging said imageing sensor in the span of regulation, and judges whether state machine is in designated state;
If the span of any overshoot then is adjusted into initial value in next clock cycle with the value of the said column counter of correspondence or the value of linage-counter in the value of the value of said column counter and linage-counter;
If said state machine is in non-designated state, then said state machine is adjusted into initial condition, and said designated state comprises initial condition, latch mode and reset mode.
2. the method for claim 1 is characterized in that, also comprises:
If the value of the value of column counter or linage-counter is in prescribed limit, then after the value sequential counting of the value of said column counter or linage-counter reaches the maximum of regulation respectively, be adjusted into initial value in next clock cycle respectively again.
3. method as claimed in claim 2 is characterized in that, the maximum of said regulation equals imageing sensor valid pixel array maximum.
4. method as claimed in claim 3 is characterized in that, the span of said regulation is the span between from the initial value to the maximum.
5. like each described method of claim 1 to 4, it is characterized in that, said after next clock cycle is adjusted into initial value with the value of the said column counter of correspondence, also comprise:
Said state machine reads the value of adjusted said column counter, turns back to initial condition.
6. an imageing sensor is characterized in that, comprising:
Judging unit is used for after imageing sensor powers on, and whether the value of column counter value and linage-counter of Digital Logical Circuits of judging said imageing sensor in prescribed limit, and judges whether state machine is in designated state;
The column counter control unit is used for when the span of the value overshoot of the said column counter of said judgment unit judges, in next clock cycle the value of said column counter is adjusted into initial value;
The linage-counter control unit is used for when the span of the value overshoot of the said linage-counter of said judgment unit judges, in next clock cycle the value of said linage-counter is adjusted into initial value;
The state machine control unit is used for when said state machine is in non-designated state, said state machine being adjusted into initial condition, and said designated state comprises initial condition, latch mode and reset mode.
7. imageing sensor as claimed in claim 6; It is characterized in that said state machine control unit also is used for, after said column counter control unit is adjusted into initial value with the value of said column counter; Read the value of said column counter, make state machine turn back to initial condition.
8. imageing sensor as claimed in claim 6; It is characterized in that; Said column counter control unit; Also be used for value when the said column counter of said judgment unit judges in prescribed limit the time, after the value sequential counting of said column counter reaches the maximum of regulation, the value of said column counter be adjusted into initial value in next clock cycle;
Said linage-counter control unit; Also be used for value when the said linage-counter of said judgment unit judges in prescribed limit the time; After the value sequential counting of said linage-counter reaches the maximum of regulation, the value of said linage-counter is adjusted into initial value in next clock cycle.
9. imageing sensor as claimed in claim 8 is characterized in that, also comprises:
Information memory cell is used to be stored as the column counter maximum of the regulation that said imageing sensor is provided with and the linage-counter maximum and the span of span and regulation.
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| CN101399903A (en) * | 2007-09-28 | 2009-04-01 | 索尼株式会社 | Solid-state image pickup device, driving method thereof, and camera system |
| CN101755450A (en) * | 2008-05-29 | 2010-06-23 | 索尼公司 | Lid-state imaging element and camera system |
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| CN101399903A (en) * | 2007-09-28 | 2009-04-01 | 索尼株式会社 | Solid-state image pickup device, driving method thereof, and camera system |
| CN101755450A (en) * | 2008-05-29 | 2010-06-23 | 索尼公司 | Lid-state imaging element and camera system |
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