WO2004112382A1 - イメージセンサの走査回路 - Google Patents
イメージセンサの走査回路 Download PDFInfo
- Publication number
- WO2004112382A1 WO2004112382A1 PCT/JP2004/005405 JP2004005405W WO2004112382A1 WO 2004112382 A1 WO2004112382 A1 WO 2004112382A1 JP 2004005405 W JP2004005405 W JP 2004005405W WO 2004112382 A1 WO2004112382 A1 WO 2004112382A1
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- WO
- WIPO (PCT)
- Prior art keywords
- signal
- switch
- circuit
- sensor
- pixel
- Prior art date
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/70—SSIS architectures; Circuits associated therewith
- H04N25/76—Addressed sensors, e.g. MOS or CMOS sensors
- H04N25/767—Horizontal readout lines, multiplexers or registers
Definitions
- the present invention relates to a scanning circuit for reading out a sensor signal of each pixel in an image sensor using a photosensor circuit that generates a sensor signal according to a photocurrent flowing to a photoelectric conversion element.
- the photodiode PD as a photoelectric conversion element that generates a sensor current according to the light quantity of incident light Llight s and the thin, the sensor current flowing to the photodiode PD is a logarithmic output characteristic in a weak inversion state
- the transistor Q1 converts the voltage signal V pd into a voltage signal V pd
- the transistor Q 2 amplifies the voltage signal V pd
- the transistor Q 3 outputs the sensor signal V o at the pulse timing of the read signal V s.
- An image sensor has been developed in which an optical sensor circuit can be used to detect an optical signal with high sensitivity by expanding a dynamic range by providing logarithmic output characteristics by using an optical sensor circuit for pixels (Japanese Patent Laid-Open No. 2 0 0 0-3 2 9 6 1 6)
- the basic configuration of the image sensor is, for example, 4 ⁇ 4 pixels of D 1 1 to D 4 4 arranged in a matrix, and the pixels for one row in the main scanning direction are pixels 2 is selected by the selection signals LS 1 to LS 4 sequentially outputted from the row selection circuit 1 and FIG. 2 shows a plurality of pixels arranged in a matrix form with the light sensor circuit shown in FIG.
- An exemplary configuration of an image sensor adapted to perform time-series readout scanning of the sensor signal V 0 is shown.
- Each corresponding switch SW 1 1 to SW 1 4 in the output switch group 3 is sequentially selected by the selection signals DS 1 to DS 4 sequentially output from the pixel selection circuit 2 for each pixel in the selected pixel row.
- the sensor signal Vo of each pixel is read out in time series.
- 4 is a power supply for the gate voltage VG of the transistor Q 1 in each pixel
- 6 is a power supply for the drain voltage VD.
- the reference resistance R is set on the output side of each row of pixels in the main scanning direction.
- the sensor signal S 0 of each pixel is output as the voltage signal V 0 by providing a bias circuit 7 that applies a bias voltage + V cc via 1 to R 4.
- a voltage switching circuit 5 is provided which temporarily switches from high level H to low level L to perform initialization.
- the pixel row selection circuit 1 and the pixel selection circuit 2 are each composed of a shift register, and are driven and controlled in synchronization with each other under control of the controller.
- FIG. 3 is a time chart of the operation of each part in the image sensor.
- the current capacity of the transistor Q 3 for output of each pixel Because it is small, it takes time to rise to the voltage value specified by the bias circuit 7, and the sensor signal of each pixel read out in time series will vary, and high-speed readout will be performed. It is something that can not be
- a buffer circuit 8 is provided between the output switch group 3 and the bias circuit 7, and each pixel is first charged during the charging period of the parasitic capacitance C according to the photocurrent in each pixel. It is considered that the sensor signal V 0 output from is stored in each of the buffer amplifiers BF 1 to BF 4 so that high-speed readout can be performed.
- the problem to be solved is that, in an image sensor using a light sensor circuit for a pixel that generates a sensor signal according to the photocurrent flowing to the photoelectric conversion element, the sensor of each pixel is When reading out the sensor signal, it takes time for the sensor signal to rise to a specified voltage value, and the sensor signal read out in time series is dispersed, and high-speed readout can not be performed.
- the present invention relates to a scanning circuit for reading out a sensor signal of each pixel in an image sensor using as an element an optical sensor circuit that generates a sensor signal corresponding to a photocurrent flowing to a photoelectric conversion element.
- a buffer circuit that temporarily accumulates
- FIG. 1 is an electric circuit diagram showing a configuration example of a light sensor circuit which is a pixel unit in an image sensor.
- FIG. 2 is an electric circuit diagram showing a basic configuration example of an image sensor using a light sensor circuit as a pixel. '
- FIG. 3 is a time chart of each signal in the image sensor shown in FIG.
- FIG. 4 is an electric circuit diagram showing a configuration example in which a buffer circuit is provided on the output side of the image sensor to increase the speed of reading out the sensor signal of each pixel.
- FIG. 5 is an electric circuit diagram showing an embodiment of a scanning circuit of an image sensor according to the present invention.
- FIG. 6 is a time chart showing 1 an example of an operation state of the energizing Suitsuchi and the output switch in an embodiment thereof.
- FIG. 7 is an electric circuit diagram showing another embodiment of the scanning circuit of the image sensor according to the present invention.
- FIG. 8 is an electric circuit diagram showing still another embodiment of the scanning circuit of the image sensor according to the present invention.
- FIG. 9 is an electric circuit diagram showing still another embodiment of the scanning circuit of the image sensor according to the present invention.
- Fig. 10 is a time chart showing the operating state of the energizing switch and the output switch after the switch-on signal is input to the shift register in the embodiment of Fig. 9.
- FIG. 11 is an electric circuit diagram showing still another embodiment of the scanning circuit of the image sensor according to the present invention.
- FIG. 12 is an electric circuit diagram showing a buffer circuit according to a general monolithic structure o
- FIG. 13 is an electric circuit diagram I showing still another embodiment of the scanning circuit of the image sensor according to the present invention.
- the country 14 is an electric circuit diagram showing an example of the configuration of the drive system of the shift register when the clock signal is given only to the register unit necessary to shift the input signal.
- FIG. 15 is an electric circuit diagram showing an example of the configuration of a shift register drive system when a clock signal is given only to a group divided into a plurality of register units necessary to shift an input signal. It is.
- FIG. 16 is an electric circuit diagram showing a configuration example of one group thereof.
- FIG. 17 is an electric circuit diagram showing another configuration example of the one group.
- BEST MODE FOR CARRYING OUT THE INVENTION The scanning circuit of an image sensor according to the present invention is, for example, an image sensor having the configuration shown in FIG. 2 and provided on the output side of sensor signals of each pixel as shown in FIG. Switch S for energizing in series with the reference resistors R 1 to R 4 of the bias circuit 7
- the switch-on signal SB which is at a high level for a relatively long T1 period, is applied to the shift register 10, and each register portion is shifted with a shift of T2 period to shift each energizing switch SW21 to SW21.
- the SW 24 is turned on sequentially.
- a switch signal SA which is at a high level for a T 2 period necessary to read out the sensor signal V 0 of each pixel at a predetermined timing, is applied to the shift register 9 to switch on each of the energizing switches SW2 1 to SW24.
- the output switches SW 1 1 to SW 14 are turned on in the period T 2 at the end of the on period T 1. '
- FIG. 7 shows another embodiment of the present invention, in which a buffer circuit 8 is provided between the output switch group 3 and the bias circuit 7 to switch the energizing switches SW21 to SW24.
- the shift registers 10 sequentially drive the buffer amplifiers BF 1 to BF 4. According to such a configuration, readout of the sensor signal V 0 of each pixel can be stably performed at high speed. And, since the respective buffer amplifiers BF 1 to BF 4 in the buffer circuit 8 are sequentially driven instead of simultaneously, power consumption can be effectively suppressed. become able to.
- FIG. 9 shows still another embodiment of the present invention, and in this case, a shift for causing switching of the energizing switches SW2 1 to SW24 without using the shift register 9 (pixel selection circuit 2) for pixel selection.
- a register 10 and AND circuits A ND 1 to AND 4 are provided.
- the switch-on signal SB which is at high level during period T1
- each register section is sequentially shifted with a shift of period T2.
- the energizing switch SW21 is turned on by the output of the second register portion RG2, and the energizing switch SW22 is output by the outputs of the third, fourth and fifth register portions RG3, RG4 and RG5. Turn on SW23 and SW24 sequentially.
- the output switch SW1 1 is turned on by the output of an AND circuit A N D 1 based on the negation signal of the output of the first register portion RG 1 and the output signal of the second register portion R G 2.
- the output switch SW12 is turned on by the output of the AND circuit AND 2 based on the negative signal of the output of the second register RG 2 and the output signal of the third register RG 3 to turn on the third register RG AND circuit with the negation signal of the 3rd output and the output signal of the 4th register unit RG4 turns on the output switch SW13 by the output of the AND 3 and the 4th register unit R
- FIG. 10 shows the operation state of the switch-on signal 38 mosquitoes in the shift register 10? And energizing Suitsuchi SW2 1 to 24 from typing output Suitsuchi SW1 1 ⁇ SW14 'at that time.
- FIG. 11 shows still another embodiment of the present invention, in which a buffer circuit 8 is provided between the output switching group 3 and the bias circuit 7, and the energizing switches SW2 1 to SW24 are provided.
- the buffer amplifiers BF 1 to BF 4 are sequentially driven by the on signal of With regard to the drive capability of a buffer circuit having multiple buffer amplifiers, In the case of the finite drive capacity S of the buffer amplifier, it is advantageous for high speed operation that the connected load is small. Therefore, as shown in FIG. 12, the buffer circuit may be formed in a tree structure to reduce the load on the buffer amplifier BF per one.
- FIG. 13 shows a configuration example when the buffer circuit 8 has a tree structure.
- a buffer amplifier BF5 and an output switch SW15 are commonly provided on the output side of the output switches SW11 to SW14, and the output switch SW15 is used as an output circuit of the AND circuits AND2, AND3 and AND4. It is designed to switch by the output of OR circuit 0 R 1 as input.
- the switch on signal SB is input to the energizing shift register 10.
- the clock signal for performing the shift operation of each shift register 9, 10 is sequentially applied only to the register portion necessary for shifting each input signal SA, SB. I am trying to
- FIG. 14 shows a configuration example of a drive system of the shift register 11 when the clock signal CK is applied only to the register unit necessary to shift the input signal SC.
- the input signal SC is shifted across the two register units RG1 and RG2 of the shift register 11, and the input signal SC is shifted to the next register unit RG 2 and RG.
- each output (31, Q 2 of the register section R Gl, 02 becomes “1”, so that each output of the OR circuit 0 R 1, OR 2, OR 3 is “1” respectively).
- the clock signal CK is given only to the register parts RG 1, RG 2 and RG 3 through the AND circuit AND 1, AND 2 and AND 3.
- each register unit consists of It is possible to effectively suppress the noise generated when inverting the lip lip according to the clock signal CK.
- FIG. 15 for example, as shown in FIG. 15, a clock signal CK for causing the shift register 12 to perform the shift operation by dividing the group G 1 to G 4 into a predetermined number of register sections in the shift register 12.
- eight register units RG 1 to RG 8 are set as one group G.
- the output states of all the register sections RG 1 to RG 8 in the group G may not be monitored.
- the input signal SC is 8
- FIG. 17 when one register unit RG 1 to RG 8 exists, at least three output states of the register units RG 2, RG 4, and RG 6 of the eight register units RG 1 to RG 8 are By looking at it, it is possible to monitor whether the input signal SC is present at the block G or not. In this case, the circuit configuration can be simplified.
- each sensor signal of each pixel comprising the light sensor circuit in the image sensor is time-sequentially read by energizing each in advance.
- the sensor signal of the pixel is read out in a saturated state.
- a buffer circuit for temporarily accumulating the sensor signal of each pixel is provided, or the sensor signal of each pixel is alternated using two shift registers. It is possible to read out the sensor signal of each pixel at high speed stably by a simple means without reading out while delaying.
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimile Heads (AREA)
- Solid State Image Pick-Up Elements (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/256,510 US7710480B2 (en) | 2003-06-11 | 2005-10-21 | Scanning circuit of image sensor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003197461A JP4254388B2 (ja) | 2003-06-11 | 2003-06-11 | イメージセンサの走査回路 |
JP2003-197461 | 2003-06-11 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/256,510 Continuation US7710480B2 (en) | 2003-06-11 | 2005-10-21 | Scanning circuit of image sensor |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004112382A1 true WO2004112382A1 (ja) | 2004-12-23 |
Family
ID=33549873
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/005405 WO2004112382A1 (ja) | 2003-06-11 | 2004-04-15 | イメージセンサの走査回路 |
Country Status (4)
Country | Link |
---|---|
US (1) | US7710480B2 (ja) |
JP (1) | JP4254388B2 (ja) |
CN (1) | CN100452841C (ja) |
WO (1) | WO2004112382A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7241984B2 (en) * | 2005-02-10 | 2007-07-10 | Canon Kabushiki Kaisha | Imaging apparatus using saturation signal and photoelectric conversion signal to form image |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20060062164A (ko) * | 2004-12-03 | 2006-06-12 | 삼성전자주식회사 | 광센서를 내장하는 표시 장치 |
JP5055469B2 (ja) * | 2006-08-04 | 2012-10-24 | 新世代株式会社 | イメージセンサ及びイメージセンサシステム |
WO2011153112A2 (en) * | 2010-05-29 | 2011-12-08 | Wenyu Jiang | Systems, methods and apparatus for making and using eyeglasses with adaptive lens driven by gaze distance and low power gaze tracking |
CN103780850B (zh) * | 2014-01-30 | 2017-12-15 | 上海集成电路研发中心有限公司 | 像素分裂与合并图像传感器及其信号传输方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11266399A (ja) * | 1998-03-18 | 1999-09-28 | Sony Corp | 固体撮像素子およびその駆動方法、並びにカメラシステム |
JP2002369080A (ja) * | 2001-06-06 | 2002-12-20 | Honda Motor Co Ltd | イメージセンサ |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5712653A (en) * | 1993-12-27 | 1998-01-27 | Sharp Kabushiki Kaisha | Image display scanning circuit with outputs from sequentially switched pulse signals |
US5933189A (en) * | 1995-03-09 | 1999-08-03 | Nikon Corporation | Solid state image pickup apparatus |
JPH0993492A (ja) | 1995-09-27 | 1997-04-04 | Nippon Hoso Kyokai <Nhk> | 固体撮像装置 |
KR100352757B1 (ko) * | 1998-06-02 | 2002-09-16 | 가부시끼가이샤 도시바 | 고속도 동작 고체 촬상 장치 |
JP3278716B2 (ja) * | 1999-05-18 | 2002-04-30 | 本田技研工業株式会社 | 光センサ回路 |
JP2002204398A (ja) * | 2000-10-05 | 2002-07-19 | Honda Motor Co Ltd | イメージセンサ |
WO2002102061A1 (fr) * | 2001-06-06 | 2002-12-19 | Honda Giken Kogyo Kabushiki Kaisha | Detecteur d'images |
US6720594B2 (en) * | 2002-01-07 | 2004-04-13 | Xerox Corporation | Image sensor array with reduced pixel crosstalk |
-
2003
- 2003-06-11 JP JP2003197461A patent/JP4254388B2/ja not_active Expired - Fee Related
-
2004
- 2004-04-15 WO PCT/JP2004/005405 patent/WO2004112382A1/ja active Application Filing
- 2004-04-15 CN CNB2004800113644A patent/CN100452841C/zh not_active Expired - Fee Related
-
2005
- 2005-10-21 US US11/256,510 patent/US7710480B2/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11266399A (ja) * | 1998-03-18 | 1999-09-28 | Sony Corp | 固体撮像素子およびその駆動方法、並びにカメラシステム |
JP2002369080A (ja) * | 2001-06-06 | 2002-12-20 | Honda Motor Co Ltd | イメージセンサ |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7241984B2 (en) * | 2005-02-10 | 2007-07-10 | Canon Kabushiki Kaisha | Imaging apparatus using saturation signal and photoelectric conversion signal to form image |
Also Published As
Publication number | Publication date |
---|---|
US20060221221A1 (en) | 2006-10-05 |
JP2005006269A (ja) | 2005-01-06 |
JP4254388B2 (ja) | 2009-04-15 |
US7710480B2 (en) | 2010-05-04 |
CN1781304A (zh) | 2006-05-31 |
CN100452841C (zh) | 2009-01-14 |
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