CN101592848B - Optical indicator device - Google Patents
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- CN101592848B CN101592848B CN 200810098247 CN200810098247A CN101592848B CN 101592848 B CN101592848 B CN 101592848B CN 200810098247 CN200810098247 CN 200810098247 CN 200810098247 A CN200810098247 A CN 200810098247A CN 101592848 B CN101592848 B CN 101592848B
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Abstract
The invention relates to an optical indicator device comprising an image sensor, a comparer and a controller. The image sensor comprises a photoelectric cell array which comprises a plurality of photoelectric cells for sensing light and generating analog signals corresponding to the light; the image sensor circularly outputs the analog signals from the photoelectric cells; the comparer is used for comparing the signals output from the image sensor to generate a relative comparison signal and comparing at least one signal output from the image sensor with the relative comparison signal to generate an absolute comparison signal; and the controller is used for using the relative comparison signal to output motion data and using the absolute comparison signal to output a shutter control signal. The invention can reduce the chip size of a semiconductor integrated circuit and can use the comparer with an offsetting removal circuit and an offsetting correcting circuit arranged outside the image sensor to output high-quality images and output accurate motion data so as to further suit practice.
Description
Technical field
The present invention relates to a kind of optical point device (optical pointing device), and or rather, particularly relate to a kind of optical point device that uses imageing sensor to obtain the exercise data of object.
Background technology
In general, imageing sensor is a kind of optical converting device that comprises a plurality of photoelectric tubes (photocell), and each photoelectric tube will convert the electric signal corresponding to its intensity from the light of object reflection to.
Optical point device converts the signal (promptly corresponding to the electric signal from the object intensity of light reflected) of above photoelectric tube to by a series of signal handling procedure the view data of object, the current image date of object and previous view data are compared, and calculate and export the exercise data of object.
Fig. 1 is the block scheme of conventional optical point device.Described optical point device comprises imageing sensor 11, A/D converter 12 (analog/digital converter), prefilter circuit (pre-filtercircuit) 13, image processor 14 and shutter control circuit (shutter control circuit) 15.
The corresponding function of square frame shown in Figure 1 will be described now.
The control circuit for light source (not shown) that is used for radiative light source (not shown) and is used to control light source is adjusted the amount of the light of emission, and with this optical illumination object (not shown).
A/D converter 12 receives described electric analoging signal PSA and exports digital signal PSAD from imageing sensor 11.
Described pre-defined rule can be edge detection algorithm (edge detectionalgorithm) substantially.
Imageing sensor 14 receives the output signal DSO of prefilter circuit 13, and calculates and export the exercise data Vk of object.
Conventional optical point device shown in Figure 1 must comprise A/D converter 12 and prefilter circuit 13, and the two can increase the layout area of optical point device, and and then increases the chip size of SIC (semiconductor integrated circuit).
Fig. 2 is the block scheme of another conventional optical point device.This conventional optical point device comprises imageing sensor 21, image processor 24 and shutter control circuit 25.
The corresponding function of square frame shown in Figure 2 will be described now.
Imageing sensor 21 detects bright dippings, converts light to corresponding to light quantity electric analoging signal, and electric analoging signal is exported as 1 bit digital signal ISO.
Fig. 3 is the block scheme of the imageing sensor of conventional optical point device shown in Figure 2.
Please referring to Fig. 3, imageing sensor 21 comprises a plurality of unit picture elements (unit pixel) 36 to 39.In the described unit picture element 36 to 39 each comprises photoelectric tube PC1, comparator C OMP1 and switch SW 1.
Photoelectric tube PC1 receives light, and produces the aanalogvoltage corresponding to light quantity.In response to shutter control signal CSH, comparator C OMP1 compares the output signal PC001 of photoelectric tube PC1 and the output signal PC002 of the photoelectric tube PC2 in the adjacent units pixel 37, and exports the digital signal COM01 of 1 bit.
In the case, the comparator C OMP N in last unit picture element 39 uses any reference voltage VREF1 as reference voltage.
In response to pixel selection signal PS, switch SW 1 will be from the 1 bit digital signal COM01 of comparator C OMP1 as the output signal ISO of imageing sensor 21 and export.
By using the imageing sensor that comprises comparator C OMP and switch SW 21 shown in Figure 3, solve the problem that is associated with conventional optical point device shown in Figure 1.Yet, in the imageing sensor 21 of optical point device shown in Figure 2, the way that comprises comparator C OMP and switch SW in unit picture element 36 to 39 has the restriction that reduces the unit picture element size, and can't compensate the skew of photoelectric tube PC1 each in the PC (N) in the unit picture element 36 to 39.
This shows that above-mentioned existing conventional optical point device obviously still has inconvenience and defective, and demands urgently further being improved in structure and use.In order to solve the problem that conventional optical point device exists, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, and this obviously is the problem that the anxious desire of relevant dealer solves.
Because the defective that above-mentioned existing conventional optical point device exists, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge, and the utilization of cooperation scientific principle, actively studied innovation, in the hope of founding a kind of optical point device of new structure, can improve general existing conventional optical point device, make it have more practicality.Through constantly research, design, and after studying sample and improvement repeatedly, create the present invention who has practical value finally.
Summary of the invention
Fundamental purpose of the present invention is, overcome the defective that the existing conventional optical point device exists, and provide a kind of optical point device of new structure, technical matters to be solved is to make it can reduce the chip size of SIC (semiconductor integrated circuit), thereby be suitable for practicality more, and have the value on the industry.
Another object of the present invention is to, a kind of optical point device is provided, technical matters to be solved is to make it have the comparer that circuit and off-centre correcting circuit are removed in the skew that is positioned at the imageing sensor outside by use, obtain high-quality image output and export exercise data accurately, thereby be suitable for practicality more.
The object of the invention to solve the technical problems realizes by the following technical solutions.A kind of optical point device that proposes according to the present invention comprises: imageing sensor, it comprises photovoltaic array, described photovoltaic array comprises a plurality of photoelectric tubes to be used for sensor light and the generation simulating signal corresponding to light, and described imageing sensor is exported the simulating signal from a plurality of photoelectric tubes sequentially; Comparer, it is used for the signal from imageing sensor output is compared producing relatively signal, and will compare from least one signal and the comparison signal of imageing sensor output, to produce absolute comparison signal; And controller, it is used to use relatively signal output movement data, and uses absolute comparison signal output shutter control signal.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid optical point device, wherein said a plurality of photoelectric tube is arranged on first direction and the second direction, described imageing sensor also can comprise: photoelectric tube line options circuit, and it is used for selecting to be arranged in response to first control signal a plurality of photoelectric tubes on the first direction; And on-off circuit, it is used for selecting in response to second control signal and exporting from the simulating signal of a plurality of photoelectric tube outputs of being selected by photoelectric tube line options circuit.
Aforesaid optical point device, wherein said controller can comprise: the exercise data output unit, it is used to receive relatively signal, and calculating and output movement data; And shutter control signal controller, it is used to receive absolute comparison signal, calculate the mean value of absolute comparison signal, and output shutter control signal, wherein said controller is exported first control signal being used for the photoelectric tube line options circuit of control chart image-position sensor, and exports second control signal to be used for the on-off circuit of control chart image-position sensor.
Aforesaid optical point device, wherein said comparer can comprise: at least one first comparer, it is used for relatively from least two simulating signals of on-off circuit output, and exports relatively signal; And at least one second comparer, it is used at least one simulating signal and comparison signal from on-off circuit output are compared, and exports absolute comparison signal.
Aforesaid optical point device, wherein said comparer also comprises: off-centre correcting circuit, it is used to proofread and correct the skew of first comparer self; And skew removal circuit, it is used to remove the skew from the signal of on-off circuit output.
Aforesaid optical point device, wherein said off-centre correcting circuit can comprise: use the switched capacitor scheme to carry out the off-centre correcting circuit of offset correction.
Aforesaid optical point device, wherein said skew are removed circuit and can be comprised: circuit is removed in the skew of using the correlated double sampling scheme to remove skew.
The object of the invention to solve the technical problems also adopts following technical scheme to realize.The another kind of optical point device that proposes according to the present invention comprises: imageing sensor, it comprises photovoltaic array, described photovoltaic array comprises a plurality of first photoelectric tubes to be used for sensor light and the generation simulating signal corresponding to light, and described imageing sensor is exported sequentially from the simulating signal of described a plurality of first photoelectric tubes outputs; At least one second photoelectric tube, it is used for sensor light and produces simulating signal corresponding to light; Comparer is used for relatively from the signal of imageing sensor output producing relatively signal, and will compares from the signal and the comparison signal of second photoelectric tube output, to produce absolute comparison signal; And controller, it is used to use relatively signal output movement data, and uses absolute comparison signal output shutter control signal.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid optical point device, wherein said a plurality of first photoelectric tube is arranged on first direction and the second direction, described imageing sensor also can comprise: photoelectric tube line options circuit, it is used for selecting to be arranged in response to first control signal a plurality of first photoelectric tubes on the first direction, and on-off circuit, be used for selecting in response to second control signal and exporting from the simulating signal of a plurality of first photoelectric tube outputs of selecting by photoelectric tube line options circuit.
Aforesaid optical point device, wherein said controller can comprise: the exercise data output unit, it is used to receive relatively signal, and calculating and output movement data; And shutter control signal controller, it is used to receive absolute comparison signal, calculate the mean value of absolute comparison signal, and output shutter control signal, wherein said controller is exported first control signal being used for the photoelectric tube line options circuit of control chart image-position sensor, and exports second control signal to be used for the on-off circuit of control chart image-position sensor.
Aforesaid optical point device, wherein said comparer can comprise: at least one first comparer, it is used for relatively from least two simulating signals of on-off circuit output, and exports relatively signal; And at least one second comparer, it is used for simulating signal and comparison signal from the output of second photoelectric tube are compared, and exports absolute comparison signal.
Aforesaid optical point device, wherein said comparer also comprises: off-centre correcting circuit, it is used to proofread and correct the skew of first comparer self; And skew removal circuit, it is used to remove the skew from the simulating signal of on-off circuit output.
Aforesaid optical point device, wherein said off-centre correcting circuit can comprise: use the switched capacitor scheme to carry out the off-centre correcting circuit of offset correction.
Aforesaid optical point device, wherein said skew are removed circuit and can be comprised: circuit is removed in the skew of using the correlated double sampling scheme to remove skew.
The present invention compared with prior art has tangible advantage and beneficial effect.By above technical scheme as can be known, in order to reach aforementioned goal of the invention, major technique of the present invention thes contents are as follows:
The present invention proposes a kind of optical point device, described optical point device comprises: imageing sensor, it comprises photovoltaic array, photovoltaic array comprises a plurality of photoelectric tubes to be used for sensor light and the generation simulating signal corresponding to light, and imageing sensor is exported the simulating signal from a plurality of photoelectric tubes sequentially; Comparer, it is used for relatively from the signal of imageing sensor output, producing relatively signal, and will compare from least one signal and the comparison signal of imageing sensor output, to produce absolute comparison signal; And controller, it is used to use relatively signal output movement data, and uses absolute comparison signal output shutter control signal; The present invention can reduce the chip size of SIC (semiconductor integrated circuit), and can have the comparer that circuit and off-centre correcting circuit are removed in the skew that is positioned at the imageing sensor outside by use, obtain high-quality image output and export exercise data accurately, thereby be suitable for practicality more.
By technique scheme, optical point device of the present invention has following advantage at least:
1, optical point device of the present invention can reduce the chip size of SIC (semiconductor integrated circuit), thereby is suitable for practicality more, and has the value on the industry.
2, optical point device of the present invention can have the comparer that circuit and off-centre correcting circuit are removed in the skew that is positioned at the imageing sensor outside by use, obtains high-quality image output and exports exercise data accurately, thereby be suitable for practicality more.
In sum, the optical point device of special construction of the present invention, it has above-mentioned many advantages and practical value, and in like product, do not see have similar structural design to publish or use and really genus innovation, no matter it structurally or bigger improvement all arranged on the function, have large improvement technically, and produced handy and practical effect, and the multinomial effect that has enhancement than the existing conventional optical point device, thereby be suitable for practicality more, and have the extensive value of industry, really be a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of instructions, below with preferred embodiment of the present invention and conjunction with figs. describe in detail as after.
The specific embodiment of the present invention is provided in detail by following examples and accompanying drawing thereof.
Description of drawings
Fig. 1 is the block scheme of conventional optical point device.
Fig. 2 is the block scheme of another conventional optical point device.
Fig. 3 is the block scheme of imageing sensor shown in Figure 2.
Fig. 4 is the block scheme of optical point device of the present invention.
Fig. 5 is the optical point device of first embodiment of the invention.
Fig. 6 is the optical point device of second embodiment of the invention.
Fig. 7 is the block scheme that the relative level comparer of circuit and off-centre correcting circuit is removed in skew that has of the present invention.
Fig. 8 a is the circuit diagram of photoelectric tube shown in Figure 5.
Fig. 8 b is the circuit diagram that circuit is removed in skew shown in Figure 7.
Fig. 9 is the circuit diagram of off-centre correcting circuit shown in Figure 7.
110: imageing sensor
111: photoelectric tube 112: on-off circuit
113: photoelectric tube line options circuit (photocell-line selection array)
114: photovoltaic array (photocell array)
130: comparator circuit
131: relative level comparer 132: the absolute level comparer
140: image processor
141: exercise data output unit 142: the shutter control signal controller
230: comparator circuit 231: the relative level comparer
232: 233: the second photoelectric tubes of absolute level comparer
331: the relative level comparer
334: off-centre correcting circuit (offset correction circuit)
335: circuit (offset removal circuit) is removed in skew
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, to its embodiment of optical point device, structure, feature and the effect thereof that foundation the present invention proposes, describe in detail as after.
Seeing also shown in Figure 4ly, is the block scheme of the optical point device of preferred embodiment of the present invention.It mainly comprises:
The corresponding function of square frame shown in Figure 4 will be described now.
The control circuit for light source (not shown) that is used for radiative light source (not shown) and is used to control light source is adjusted the amount of the light of emission, and with this optical illumination object (not shown).
130 couples of simulating signal OUT_EVEN and OUT_ODD from imageing sensor 110 outputs of comparator circuit compare, and output digital signal, i.e. relatively output signal OUT_RE and definitely comparison output signal OUT_ABS.
Seeing also shown in Figure 5ly, is the optical point device of the present invention's first preferred embodiment, and it mainly comprises:
The corresponding function of square frame shown in Figure 5 will be described now.
The control circuit for light source (not shown) that is used for radiative light source (not shown) and is used to control light source is adjusted the amount of the light of emission, and with this optical illumination object (not shown).
In response to control signal P-CON from imageing sensor 140, the photoelectric tube selection wire SEL_0A that photoelectric tube line options circuit 113 selects to be connected to a plurality of photoelectric tubes on the alignment (column line) of photovoltaic array to SEL_NB, and opens the output line of the photoelectric tube that is connected to selected photoelectric tube selection wire to SEL_NA and SEL_0B.
On-off circuit 112 is in response to the control signal S-CON from image processor 140, selects by a plurality of output line OUT_0 that open both in the OUT_M.
Though the not shown light source controller (not shown) that is used for radiative light source and is used to control the light source of optical point device, but can export picture signal by light source controller (for example the shutter control signal controller 142), as clearer picture signal from the object of photoelectric tube 111.
With the description of using the function of the square frame in the optical point device shown in Figure 5, the operation of optical point device is described.
In imageing sensor 110, a plurality of photoelectric tubes 111 produce corresponding to the electric analoging signal by the amount of the light that object reflected.
Photoelectric tube line options circuit 113 in the imageing sensor 110 is in response to from the control signal P-CON of image processor 140 and output line is selected signal, so that select a plurality of photoelectric tube selection wire SEL_0A both in the SEL_NA.Being connected to selected photoelectric tube selection wire SEL_0A opens to OUT_M to a plurality of photoelectric tube output line OUT_0 of SEL_0B.
In the case, have only a photoelectric tube 111 to be connected to a plurality of photoelectric tube output line OUT_0 that open each photoelectric tube output line OUT_0 in the OUT_M, so that output is from the simulating signal of photoelectric tube 111.Can by the prefilter rule come selective light fulgurite selection wire SEL_0A to SEL_NA and SEL_0B to SEL_NB.Perhaps, can select it randomly or sequentially.Intention by the deviser is determined the prefilter principle.Yet, in one exemplary embodiment of the present invention, the photoelectric tube selection wire is described as: select sequentially by the prefilter rule.After the output from all photoelectric tubes of being selected by on-off circuit 112 all finishes, carry out from selected photoelectric tube selection wire SEL_0A to the switching of SEL_0B to other selection wire SEL_1A to SEL_1B.To understand easily, can change the wiring between the photoelectric tube of prefilter rule and photovoltaic array, selecting at least two photoelectric tube selection wires, and can only select the photoelectric tube in the essential regions by selective light fulgurite selection wire.
In response to control signal S-CON from image processor 140, all output line OUT_0 that on-off circuit 112 is opened by the line options signal in the OUT_M both (OUT_0, OUT_1), (OUT_1, OUT_2) .... (OUT_M-1, OUT_M) } select.Photoelectric tube line options circuit 113 is up to all selected output line OUT_0 of on-off circuit 112 output during to the simulating signal of the photoelectric tube of OUT_M, just the photoelectricity pipeline SEL_0A and the SEL_0B that select of change.
In the case, with the same in the photoelectric tube line options circuit 113, select output line OUT_0 to OUT_M by the prefilter rule in the on-off circuit 112.Perhaps, can come randomly or sequentially it to be selected by the prefilter rule.Determine the prefilter rule of on-off circuit 112 by deviser's intention, to select relatively photoelectric tube.Yet in one exemplary embodiment of the present invention, two output lines selecting the adjacent light fulgurite are for output.To understand easily, can change the prefilter rule, and can select at least two output lines of photoelectric tube.
In comparator circuit 130, relative level comparer 131 receives and relatively from two the signal OUT_EVEN and the OUT_ODD of on-off circuit 112, and exports the relatively output signal OUT_RE of 1 bit.
To understand easily, can change the prefilter rule of on-off circuit 112, and make on-off circuit 112 can have at least two outputs, and at least two relative level comparers 131 will be provided.Specifically, will understand easily also that by the values that will obtain from least two of on-off circuit 112 output additions, it can compare with the value from the specific light fulgurite of appointment.
In comparator circuit 130, absolute level comparer 132 will be from two signals of on-off circuit 112 output, and a signal OUT_EVEN and comparison signal (voltage of predetermined level) compare, and export the absolute comparison output signal OUT_ABS of 1 bit.
To understand easily, another output signal OUT_ODD that absolute level comparer 132 can adopt on-off circuit 112 is signal as a comparison, and can change the prefilter rule of on-off circuit 112, make on-off circuit 112 can have at least two outputs, and at least two absolute level comparers 132 can be provided.
In image processor 140, exercise data output unit 141 receives and stores the relatively output signal OUT_RE from relative level comparer 131.The output of exercise data output unit 141 all photoelectric tubes of storage and the image of formation object compare formed image and the previous subject image of being stored, and calculating and output movement data Vk.
The shutter control signal controller 142 of image processor 140 receives and stores the absolute comparison output signal OUT_ABS from absolute level comparer 132, and calculate the mean value of the data of being stored, and output is used for the shutter control signal CSH of the electronic shutter of control chart image-position sensor 110.
See also shown in Figure 6, the optical point device of the present invention's second preferred embodiment, it mainly comprises:
The corresponding function and the operation of square frame shown in Figure 6 will be described now.
To omit to the imageing sensor 110 with reference number identical and the description of image processor 140, because it has the configuration identical with those configurations among Fig. 5 and carries out and its identical operations with those reference numbers shown in Figure 5.
Second photoelectric tube 233 that is connected to absolute level comparer 232 separates with imageing sensor 110, so that control fast gate control.233 outputs of second photoelectric tube are corresponding to the voltage level of the amount of input light.To understand easily, can change the prefilter rule of on-off circuit 112, make on-off circuit 112 have at least two outputs, and at least two relative level comparers 231 are provided, and at least two second photoelectric tubes 233 and at least two absolute level comparers 232 can be provided.
The present invention does not comprise A/D converter and is used to produce the prefilter circuit of 1 bit digital signal, thereby can reduce chip size when will optical point device according to the present invention being embodied as semiconductor device, and this is different from conventional optical point device.In addition, second photoelectric tube 233 is used for fast gate control can reduces the input data computation complicacy that image processor 140 is used to produce the shutter control signal controller 142 of shutter control signal, thereby reduce the current drain in the image processor 140.
See also shown in Figure 7, be preferred embodiment of the present invention optical point device further have a block scheme that the relative level comparer of circuit and off-centre correcting circuit is removed in skew.
Described relative level comparer comprises on-off circuit 112, circuit (offset removalcircuit 335) and off-centre correcting circuit (offset correction circuit 334) are removed in skew.
The corresponding function of square frame shown in Figure 7 will be described now.
With the description of omitting, because it has the configuration identical with the configuration among Fig. 5 and carries out and its identical operations to on-off circuit 112 with reference number identical with reference number shown in Figure 5.
Relative level comparing unit 330 comprises relative level comparer 331, circuit 335 and off-centre correcting circuit 334 are removed in skew.
Skew is removed circuit 335 from on-off circuit 112 received signal OUT_EVEN and OUT_ODD.Skew is removed circuit 335 and is used correlated double sampling scheme (correlated double samplingscheme), removes the skew of input signal OUT_EVEN and OUT_ODD, and output does not have the signal EVEN_R and the ODD_R of skew.
In order to proofread and correct the skew of relative level comparer 331, relative level comparer 331 is connected to the off-centre correcting circuit 334 that uses switched capacitor scheme switched-capacitor scheme.Relative level comparer 331 receives and relatively removes from skew the signal EVEN_R and the ODD_R that do not have skew of circuit 335, and exports the relatively output signal OUT_RE of 1 bit.
See also shown in Fig. 8 a and Fig. 8 b, the optical point device of preferred embodiment of the present invention, it mainly comprises:
Fig. 8 a is the circuit diagram of photoelectric tube shown in Figure 5.Photoelectric tube 111 comprises a plurality of nmos pass transistor M2 to M4 and photodiode PD.
Fig. 8 b explanation uses the skew of correlated double sampling scheme to remove circuit.Skew remove circuit comprise a plurality of nmos pass transistor M5 to M7, a plurality of PMOS transistor M9 to M14, two capacitor CS and CR and operational amplifier BG1.
To describe photoelectric tube and be offset the operation of removing circuit referring to Fig. 8 a and Fig. 8 b.
In case initialization, when apply to photoelectric tube 111 be in " height " level reset signal RST the time, just on node TD, produces and reset voltage VR, and nmos pass transistor M3 output is corresponding to the voltage of reseting voltage VR.When being in the selection signal SEL_SL of " height " level when applying, nmos pass transistor M4 connects, and sends corresponding to the voltage of reseting voltage VR to output line OUT_0.Via on-off circuit 112 voltage on the output line OUT_0 is outputed to the input OUT_EVEN that circuit 335 is removed in skew.When control signal SR_CON connected, nmos pass transistor M6 sent input signal OUT_EVEN.Accumulation is corresponding to the electric charge of the voltage of input signal OUT_EVEN in capacitor CR.In the case, accumulation adds that corresponding to reseting voltage VR offset voltage Voff is the electric charge of voltage VR+Voff in capacitor CR.
What be in " low " level when applying resets signal RST and the not shown unlatching of shutter so that apply the light time to photodiode PD, and nmos pass transistor M2 disconnects, and flows corresponding to the electric current of the light that is applied to photodiode PD.Correspondingly, on node TD, produce signal voltage Vsig.When producing selection signal SEL_SL with " height " level, nmos pass transistor M3 output is corresponding to the voltage of the voltage on the node TD.And nmos pass transistor M4 connects, and to the voltage of output line OUT_0 transmission corresponding to the voltage on the node TD.Via on-off circuit 112 voltage on the output line OUT_0 is outputed to the input OUT_EVEN that circuit 335 is removed in skew.After this, when shutter close and generation were in the control signal SS_CON of " height " level, nmos pass transistor M7 sent input signal OUT_EVEN, and in capacitor CS accumulation corresponding to the electric charge of the voltage of input signal OUT_EVEN.In the case, accumulation adds that corresponding to signal voltage Vsig offset voltage Voff is the electric charge of voltage Vsig+Voff in capacitor CS.After this, when with the control signal C_CON of after-applied being in " low " level, PMOS transistor M9 and M11 connect, on node N1, produce voltage, and on node N2, produce voltage corresponding to the voltage VR+Voff that is applied to PMOS transistor M12 corresponding to the voltage Vsig+Voff that is applied to PMOS transistor M10.Operational amplifier BG1 amplifies the difference between two voltages, and produces the output OUT_EVEN_A that does not have offset voltage Voff.In this way, remove circuit 335 by skew and produce the output OUT_EVEN_A that does not have skew.
Above describe and be based on the fact that signal voltage comprises the offset voltage that transistor M3 produced.In reseting voltage and signal voltage, all there is offset voltage, and can be by from the signal voltage that comprises offset voltage, deducting the signal of reseting that comprises offset voltage, and obtains not have the output signal that is offset.
Seeing also shown in Figure 9ly, is the circuit diagram that circuit is removed in the skew shown in Figure 7 of the optical point device of preferred embodiment of the present invention.It mainly comprises:
A plurality of switch S 1 arrive S6, a plurality of capacitor C1 to C2 and comparer BG2.
Now the operation of the off-centre correcting circuit that uses the switched capacitor scheme will be described referring to Fig. 9.
When a plurality of switch S 5 of off-centre correcting circuit 334 with S6 disconnects and a plurality of switch S 1 to S4 when connecting, input signal not.Correspondingly, only export and apply the offset voltage Voff of comparer BG2 to node P and Q via switch S of connecting 3 and S4.Storage is applied to the offset voltage Voff of node P and Q in capacitor C1 and C2.Under this state, when connecting a plurality of switch S 5 and S6 and disconnect a plurality of switch S 1 to S4, simulating signal OUT_EVEN_A and OUT_ODD_A to node A and B input photoelectric tube, and produce the offset voltage Voff that simulating signal OUT_EVEN_A and OUT_ODD_A add the comparer that is stored among capacitor C1 and the C2, i.e. signal OUT_EVEN_A+Voff and OUT_ODD_A+Voff respectively at node P and Q place.
Signal voltage OUT_EVEN_A+Voff and OUT_ODD_A+Voff on comparer BG2 reception and comparison node P and the Q, and export relatively signal OUT_RE.
Input signal must be higher than input off-set voltage Voff, makes comparer comparator input signal and export comparison signal.Therefore, the signal that off-centre correcting circuit relatively obtains by offset voltage Voff and input signal summation with comparer, and output comparison signal, wherein capacitor is used to store the offset voltage Voff of comparer.
Use the skew of correlated double sampling scheme to remove the off-centre correcting circuit of circuit and use switched capacitor scheme to remove or to proofread and correct skew.In optical point device, the photoelectric tube of imageing sensor has its skew, and this can cause the noise of fixed pattern, and its number percent increases under the light of scheduled volume, thereby makes comparatively difficulty of optical point.In addition, when in fact implementing the circuit of comparer, the inconsistent meeting of assembly causes skew, thereby causes the input signal in the compare operation of comparer difference to occur, thereby causes that device breaks down.The relative level comparer 331 that comprises skew removal circuit 335 and off-centre correcting circuit 334 has solved above problem, and the low noise signal-to-noise that allows at optical signalling, obtain high-quality image in the environment of S/N ratio, make optical point device stably operate.
Therefore, do not comprise A/D converter or prefilter circuit according to optical point device of the present invention, thereby reduced the device area and the chip size of SIC (semiconductor integrated circuit), this is different from conventional optical point device.
In addition, optical point device according to the present invention has the skew that is positioned at the imageing sensor outside by use and removes the comparer of circuit and off-centre correcting circuit so that obtain the exercise data of object, can obtain high-quality image output and correspondingly obtain exercise data accurately.In addition, use second photoelectric tube that separates with imageing sensor can reduce the data computation complicacy of image processor, thereby reduced the current drain in entire circuit and the image processor.
Though disclosed one exemplary embodiment of the present invention for purpose of explanation, be appreciated by those skilled in the art that, under the situation that does not depart from scope of the present invention, can carry out various modifications, interpolation and replacement.Therefore, the invention is not restricted to the foregoing description, but define by the four corner of appended claims together with its equivalent.
The technological innovation of the optical point device of the present invention that above-mentioned structure like this constitutes all has many saving graces for technician of the same trade now, and the progressive that possesses skills really.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (14)
1. optical point device is characterized in that it comprises:
Imageing sensor, it comprises photovoltaic array, and described photovoltaic array comprises a plurality of photoelectric tubes to be used for sensor light and the generation simulating signal corresponding to described light, and described imageing sensor is exported the simulating signal from described a plurality of photoelectric tubes sequentially;
Comparer, it is used for relatively from the described signal of described imageing sensor output, producing relatively signal, and will compare from least one signal and the comparison signal of described imageing sensor output, to produce absolute comparison signal; And
Controller, it is used to use described relatively signal output movement data, and uses described absolute comparison signal output shutter control signal.
2. optical point device according to claim 1 is characterized in that wherein said a plurality of photoelectric tube is arranged on first direction and the second direction, and described imageing sensor also comprises:
Photoelectric tube line options circuit, it is used to respond first control signal and selects to be arranged in described a plurality of photoelectric tubes on the described first direction; And
On-off circuit, it is used for selecting in response to second control signal and exporting from the simulating signal of described a plurality of photoelectric tube outputs of being selected by described photoelectric tube line options circuit.
3. optical point device according to claim 2 is characterized in that wherein said controller comprises:
The exercise data output unit, it is used to receive described relatively signal, and calculating and output movement data; And
The shutter control signal controller, it is used to receive described absolute comparison signal, calculate the mean value of described absolute comparison signal, and output shutter control signal, wherein said controller is exported described first control signal being used to control the described photoelectric tube line options circuit of described imageing sensor, and exports described second control signal to be used to control the described on-off circuit of described imageing sensor.
4. optical point device according to claim 2 is characterized in that wherein said comparer comprises:
At least one first comparer, it is used for relatively from least two simulating signals of described on-off circuit output, and exports described relatively signal; And
At least one second comparer, it is used at least one simulating signal and described comparison signal from described on-off circuit output are compared, and exports described absolute comparison signal.
5. optical point device according to claim 4 is characterized in that wherein said comparer also comprises:
Off-centre correcting circuit, it is used to proofread and correct the skew of described first comparer self; And
Circuit is removed in skew, and it is used to remove the skew from the described signal of described on-off circuit output.
6. optical point device according to claim 5 is characterized in that wherein said off-centre correcting circuit comprises:
Use the switched capacitor scheme to carry out the off-centre correcting circuit of offset correction.
7. optical point device according to claim 5 is characterized in that wherein said skew removal circuit comprises:
Circuit is removed in the skew of using the correlated double sampling scheme to remove described skew.
8. optical point device is characterized in that it comprises:
Imageing sensor, it comprises photovoltaic array, described photovoltaic array comprises a plurality of first photoelectric tubes to be used for sensor light and the generation simulating signal corresponding to described light, and described imageing sensor is exported sequentially from the simulating signal of described a plurality of first photoelectric tubes outputs;
At least one second photoelectric tube, it is used for sensor light and produces simulating signal corresponding to described light;
Comparer, it is used for relatively from the described signal of described imageing sensor output producing relatively signal, and will compare from the described signal and the comparison signal of described second photoelectric tube output, to produce absolute comparison signal; And
Controller, it is used to use described relatively signal output movement data, and uses described absolute comparison signal output shutter control signal.
9. optical point device according to claim 8 is characterized in that wherein said a plurality of first photoelectric tube is arranged on first direction and the second direction, and described imageing sensor also comprises:
Photoelectric tube line options circuit, it is used for selecting to be arranged in response to first control signal described more than first photoelectric tube on the described first direction; And
On-off circuit, it is used for selecting in response to second control signal and exporting from the simulating signal of described a plurality of first photoelectric tube outputs of being selected by described photoelectric tube line options circuit.
10. optical point device according to claim 9 is characterized in that wherein said controller comprises:
The exercise data output unit, it is used to receive described relatively signal, and calculating and output movement data; And
The shutter control signal controller, it is used to receive described absolute comparison signal, calculate the mean value of described absolute comparison signal, and output shutter control signal, wherein said controller is exported described first control signal being used to control the described photoelectric tube line options circuit of described imageing sensor, and exports described second control signal to be used to control the described on-off circuit of described imageing sensor.
11. optical point device according to claim 9 is characterized in that wherein said comparer comprises:
At least one first comparer, it is used for relatively from least two simulating signals of described on-off circuit output, and exports described relatively signal; And
At least one second comparer, it is used for described simulating signal and described comparison signal from described second photoelectric tube output are compared, and exports described absolute comparison signal.
12. optical point device according to claim 11 is characterized in that wherein said comparer also comprises:
Off-centre correcting circuit, it is used to proofread and correct the skew of described first comparer self; And
Circuit is removed in skew, and it is used to remove the skew from the described simulating signal of described on-off circuit output.
13. optical point device according to claim 12 is characterized in that wherein said off-centre correcting circuit comprises:
Use the switched capacitor scheme to carry out the off-centre correcting circuit of offset correction.
14. optical point device according to claim 12 is characterized in that wherein said skew removal circuit comprises:
Circuit is removed in the skew of using the correlated double sampling scheme to remove described skew.
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| CN 200810098247 CN101592848B (en) | 2008-05-28 | 2008-05-28 | Optical indicator device |
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| CN 200810098247 CN101592848B (en) | 2008-05-28 | 2008-05-28 | Optical indicator device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1459703A (en) * | 2002-05-17 | 2003-12-03 | 义隆电子股份有限公司 | An image contrast circuit for optical pointing device |
| US20050063598A1 (en) * | 2003-09-24 | 2005-03-24 | Sen Liew Tong | Motion detection using multi-resolution image processing |
| CN1667565A (en) * | 2004-03-11 | 2005-09-14 | 艾勒博科技股份有限公司 | Image sensor, optical pointing device and motion calculating method of optical pointing device |
| US20070002022A1 (en) * | 2005-07-04 | 2007-01-04 | Chul-Yong Joung | Optical pointing device, optical pointing system, and method of operating the same |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1459703A (en) * | 2002-05-17 | 2003-12-03 | 义隆电子股份有限公司 | An image contrast circuit for optical pointing device |
| US20050063598A1 (en) * | 2003-09-24 | 2005-03-24 | Sen Liew Tong | Motion detection using multi-resolution image processing |
| CN1667565A (en) * | 2004-03-11 | 2005-09-14 | 艾勒博科技股份有限公司 | Image sensor, optical pointing device and motion calculating method of optical pointing device |
| US20070002022A1 (en) * | 2005-07-04 | 2007-01-04 | Chul-Yong Joung | Optical pointing device, optical pointing system, and method of operating the same |
| CN1892556A (en) * | 2005-07-04 | 2007-01-10 | 艾勒博科技股份有限公司 | Optic mouse and optic mouse system and method thereof |
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