CN101074762A - Image sensor testing light source system - Google Patents

Image sensor testing light source system Download PDF

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Publication number
CN101074762A
CN101074762A CNA200610035556XA CN200610035556A CN101074762A CN 101074762 A CN101074762 A CN 101074762A CN A200610035556X A CNA200610035556X A CN A200610035556XA CN 200610035556 A CN200610035556 A CN 200610035556A CN 101074762 A CN101074762 A CN 101074762A
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CN
China
Prior art keywords
circuit
light source
led
output
input
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Pending
Application number
CNA200610035556XA
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Chinese (zh)
Inventor
黄林
张克宇
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BYD Co Ltd
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BYD Co Ltd
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Publication date
Application filed by BYD Co Ltd filed Critical BYD Co Ltd
Priority to CNA200610035556XA priority Critical patent/CN101074762A/en
Publication of CN101074762A publication Critical patent/CN101074762A/en
Pending legal-status Critical Current

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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

The invention discloses image sensor test light source system, including the light source, the power supply circuit for, it is characterizes in that the light source is LED light source, the system also includes a control circuit, a control signal input port, a LED driver circuit, the control signal input port output connecting control circuit input and output control circuit connecting the input LED drive circuit, the output LED drive circuit connecting the LED light source on. Because of this invention can be controlled through the control input signal input circuit, it can achieve variety of brightness adjustment functions, such as allowing the light source in a certain period of time within certain linear brightness changes, or in a certain period of time to step in jump change.

Description

Image sensor testing light source system
Technical field
The present invention relates to a kind of light-source system, relate in particular in the finished product test work of CMOS Image Sensor (CMOS image sensor) chip, be used to the various test events of chip that the test macro of light source is provided.
Background technology
In the finished product test process of CMOS Image Sensor chip, must carry out necessary test to the various performances of chip, whether can reach design desired effect just to check chip, the overall performance of chip is assessed.Wherein, dark current, susceptibility, bright field pixel, details in a play not acted out on stage, but told through dialogues pixel etc. are the important indicators of weighing a CIS chip quality.In the past, detect the light-source system of these performance indications, the general light source that uses light as test usefulness, by intercepting a part of illuminating area as the light area, the luminance uniformity that keeps illumination, incandescent light produces by electric current that a large amount of heats are in incandescent state by filament on filament and is luminous, its most electric energy transforms for heat energy, have only the sub-fraction energy to be converted into luminous energy, so power consumption is big, efficient is low, the only panchromatic light that it sends, monochromatic poor performance, temperature height during owing to work, make filament blow easily, working life is not long yet; The someone adopts LED as light source now, compare with light source, because LED utilizes semiconductor as luminescent material, when two ends add forward voltage, carrier in the semiconductor takes place compound, emits superfluous energy and causes that photo emissions produces visible light, belongs to the cold light light source, power consumption only is 1/8th of incandescent lamp under the same illuminating effect, low in energy consumption, the efficient height, and also the spectrum that led light source excites when luminous is narrow, monochromaticjty is good, burning out except not generating heat in a large number, the LED lamp body is long-pending little, in light weight, epoxy encapsulation, can bear high-strength mechanical and impact and shake, can reach 5 to 10 years service life.But, adopt LED as light source, though light source quality height, the brightness regulation inconvenience.
Summary of the invention
Technical problem to be solved by this invention provides a kind of light-source system that is used for CMOS Image Sensor test that can regulate brightness.
System of the present invention, comprise light source, for the power supply of each circuit supply, described light source is a led light source, system also comprises a control circuit, a control signal input port, a led drive circuit, the output of control signal input port connects the input of control circuit, the output of control circuit connects the input of led drive circuit, and the output of led drive circuit is connected on the led light source.
Described control signal input port is a button control signal input port.By importing different key informations, can realize that the variation of system source brightness is regulated.
Described system also comprises the illumination photometer circuit and the LCD display module that are used to respond to and detect the illumination size of the illumination that led light source provides, the input of illumination photometer circuit (optical signal) is the illumination output of led light source, the output of illumination photometer circuit is connected with the input of control circuit, and the input of LCD display module connects the output of control circuit.The illumination photometer circuit passes through the induction of the illumination brightness of LED is detected, and converts the brightness optical signal to data signal and is input to control circuit, transfers to control circuit decoding processing signals, and digital signal corresponding is exported to the LCD demonstration.
Described drive circuit is made of voltage up converting circuit, D/A converting circuit and current driving circuit, voltage up converting circuit is pressed for led light source provides galvanic current, D/A converting circuit will be provided with and the data signal of control circuit output is converted to aanalogvoltage, via current driving circuit, convert aanalogvoltage to corresponding Constant Direct Current electric current.Boost by voltage transitions, press for light source provides galvanic current, and, provide the LED that can accurately regulate passage current, to satisfy the needs of regulating light source different brackets luminosity by the digital-to-analogue conversion drive circuit.
Described control circuit comprises single-chip microcomputer and peripheral circuit, and peripheral circuit comprises interface conversion circuit and anti-jamming circuit.
Described illumination photometer circuit comprises silicon photocell, amplifier, selective circuit of measuring range and A/D convertor circuit, silicon photocell, amplifier, A/D convertor circuit cascade connect, selective circuit of measuring range is connected with amplifier, the silicon photocell induction detects the luminosity of led light source, convert optical signal to the signal of telecommunication, amplifier is regulated the multiplication factor of selective amplifier automatically according to selective circuit of measuring range, the signal of telecommunication of silicon photocell output is amplified, export to A/D convertor circuit, A/D convertor circuit becomes data signal to be sent in the control circuit analog-signal transitions of input.
Described led light source is made of the LED-backlit plate.The light ratio that the LED-backlit plate sends is more even.The LED-backlit plate did not occur at the light-source system of CMOS Image Sensor test, but on the LCDs of mobile phone, computer etc. this structure was arranged all at present.
The present invention for example allows light source carry out linear change in the certain brightness range of certain hour owing to can therefore can realize the function of multiple brightness regulation by control signal input circuit input control, perhaps carries out the saltus step of step evolution etc. in certain time period.
Description of drawings
Fig. 1 is the testing light source system block diagram in the embodiment of the invention 1;
Fig. 2 is the testing light source circuit theory schematic diagram in the embodiment of the invention 2.
The present invention is further illustrated with reference to the accompanying drawings.
The specific embodiment
Embodiment 1
Present embodiment is a general embodiment of the present invention, please refer to Fig. 1, the present invention includes an input port 8, be used for input is controlled in the work of control circuit 5, port comprises socket and RS232 interface, can be connected on the button and computer on, the output of input port 8 is connected to control circuit 5; Comprise a led light source 4, provide the carrier of light source as system, for test provides stable light source; The drive circuit 3 that comprises LED, boost by voltage transitions, for providing galvanic current, light source presses, and by the digital-to-analogue conversion drive circuit, the LED that can accurately regulate is provided passage current, to satisfy the needs of regulating light source different brackets luminosity, the output of drive circuit 4 is connected on the white LED light source 4; Comprise a control circuit 5, be used for control is regulated in the brightness of led light source 4, the control input of circuit comprises conventional button input, can also be connected with computer by serial line interface, by computer circuit is carried out control operation, can realize that the multiple systems light-source brightness changes the function of regulating, circuit receives the input signal of illumination photometer circuit 7 simultaneously, arrive LCD display module 6 by algorithm conversion output data signal, the size that shows current led light source 4 brightness, the output of control circuit 5 are connected to drive circuit 3, LCD display module 6; Also comprise an illumination photometer circuit 7, be used to respond to and detect the illumination size of the illumination that led light source 4 provided, the output of illumination photometer circuit 7 is connected with the input of control circuit 5; 6 of LCD display modules show the size of illumination photometer circuit 7 induction brightness values, are connected with control circuit 5; D.C. regulated power supply 1 provides power supply for above-mentioned each several part circuit, an output of voltage-stabilized power supply 1 is connected on the input of mu balanced circuit 2,2 pairs of voltages from dc source of mu balanced circuit carry out voltage stabilizing, and output is connected on respectively on the input of drive circuit 3, control circuit 5, illumination photometer circuit 7.
Embodiment 2
Present embodiment is a most preferred embodiment of the present invention.Please refer to Fig. 2, drive circuit 4 is by the boost conversion unit among the figure, the DA converting unit, and the current drives unit constitutes; Control circuit 5 is made of single-chip microcomputer and RS232 interface circuit; Illumination photometer circuit 7 is by silicon photocell, amplifier, and the AD converting unit constitutes; Input port 8 is RS232 ports.
Described led light source is made of the LED-backlit plate.The LED-backlit plate is rectangle or strip, and the luminous and two kinds of basic structures of bottom-emission of sidepiece are arranged, and these two kinds of structures all have application at present in mobile phone or computer liquid crystal display screen.The luminous structure of sidepiece is mainly used in the backlight of long and narrow bar shaped; And the bottom-emission structure is mainly used in the backlight that length and width are more or less the same.Luminous tube is embedded in the backlight, and when light emitting diode was lighted, light was injected transparent organic glass, makes whole light-emitting area can see light, and this is called the marginal ray effect.It is granular that the lucite top makes microballon, can make the light of whole light-emitting area more even.One deck milky overlay is arranged at the top of lucite, can make the light that sends more soft.The backlight dual-side is sealed with the silver color shading rubber belt.Each LED luminescence unit is shown two diode in series, and some row are formed led array (length on backlight is decided).The light that tabula rasa produced is only sent by the LED pipe enters LGP in the mode of end face irradiation (edge light), help by reflector, about 50% light can enter leaded light from end face, most light utilizes total reflection toward thin end conduction, when light is run into the diffusion point in the bottom surface, reverberation can be toward all angles diffusions, destroy total reflection condition and penetrate from LGP is positive; The diffusion dot pattern design that utilize density, varies in size can make LGP face uniformly light-emitting.The effect of diffusion sheet is to allow the light that penetrates distribute more even.Reflecting plate will be in the light reflected back LGP that the bottom surface spills, to increase the service efficiency of light.
The course of work with the brightness of computer control break light source luminescent in the present embodiment is as follows: at first, when the control circuit single-chip microcomputer is initialized, the data that are provided with initial in the single-chip microcomputer are outputed to DA converting unit and LCD display by the I/O port, for example initial setting up LCD video data is 0, the data that output to the DA converting unit are 0, also are 0 by the magnitude of voltage that is input to the current drives unit after the DA converting unit then.This moment system power supply by behind mu balanced circuit and the boost conversion unit for led light source provides operating voltage, but since the current drives unit be input as 0, output current also is 0, so led light source is not luminous.Therefore, the optical signal of the led light source that silicon photocell is sensed is 0, and silicon photocell can convert light intensity to electric current, and then the electric current of conversion this moment is 0 also, does not have signal to be input to amplifier.The output of amplifier also is 0, and after the AD converting unit, the data signal that is input to single-chip microcomputer also is 0.The whole light source system is in original state.
Light-source system is connected with computer by the RS232 interface.Import data on computers, send single-chip microcomputer to, for example send a digital quantity by 232 interfaces.After single-chip microcomputer receives the data of computer transmission input,, generate the data of a multi-bit parallel corresponding, send to the DA converting unit by the I/O port with the input data by the computing of single-chip microcomputer internal processes.The DA converting unit is used for converting the data signal of input to corresponding big or small aanalogvoltage, and the big or small progression of the voltage that it can be changed is relevant with the figure place of input signal.The DA converting unit of 8 inputs can convert the voltage of 256 grades of sizes to.The current drives unit becomes corresponding drive current, driving LED light source luminescent with the voltage transitions of input.Because the luminosity of LED and its passage current are linear, the big more then brightness of electric current is high more, and the data volume of the passage current of LED size and input becomes corresponding relation, therefore by the input control of computer, can control the luminous brightness of LED.Led light source is used for radiation in CMOS Image Sensor chip, also acts on the silicon photocell of system simultaneously.After silicon photocell is sensed the optical signal of light source, convert corresponding electric current to, be input in the amplifier.Amplifier is connected with selective circuit of measuring range, and the scope of the output valve of selective circuit of measuring range after according to the amplifier amplifying signal automatically adjusts the multiplication factor of FEEDBACK CONTROL amplifier.Output to the input of AD converting unit through the signal of telecommunication of amplifier amplification after the measurement range selection.The AD converting unit becomes data signal to send to single-chip microcomputer by the I/O mouth analog signal conversion.Single-chip microcomputer generates corresponding signal and sends to LCD display after the signal of input is deciphered processing, and the numeral that demonstrates is the brightness value of light source luminescent.
As test CMOS Image Sensor, when needing again to change the brightness of light source, send the data volume that needs to single-chip microcomputer by computer, light-source system will carry out s operation control once more according to the data of input, changes the luminosity of led light source.
When needs allow light source carry out the linear change of brightness within a certain period of time automatically, when for example carrying out the linear increment of brightness, at first corresponding control programs is stored in the storage element of single-chip microcomputer, send data signals in the single-chip microcomputer by computer, start this control program, the single-chip microcomputer internal clocking carries out timing, one identical period of every interval, send a data signal that increases progressively to the DA converting unit, the DA converting unit converts the data signal of input to the aanalogvoltage of corresponding size, send to the current drives unit, become corresponding direct current driven led light source through the current drives cell translation again, realize that the linear increment of led light source brightness changes.
Owing to be the size of current of LED to be controlled, so the brilliance control precision of light-source system is very high among the embodiment, and brightness changes the progression height by single-chip microcomputer and DA converting unit.Can provide 256 grades of accurate brightness to change when using 8 DA converting units, and can provide 4096 grades of accurate brightness to change when using 12 DA converting units.As light source, the luminance uniformity height can reach the luminance uniformity more than 90% with the LED-backlit plate, and low in energy consumption, response speed is fast, the life-span is long.

Claims (7)

1, image sensor testing light source system, comprise light source, for the power supply of each circuit supply, it is characterized in that: described light source is a led light source, system also comprises a control circuit, a control signal input port, a led drive circuit, the output of control signal input port connects the input of control circuit, the output of control circuit connects the input of led drive circuit, and the output of led drive circuit is connected on the led light source.
2, testing light source system according to claim 1 is characterized in that: described control signal input port be one by strong control signal input port.
3, testing light source system according to claim 1 is characterized in that: described led light source is made of the LED-backlit plate.
4, testing light source system according to claim 1, it is characterized in that: described system also comprises the illumination photometer circuit and the LCD display module that are used to respond to and detect the illumination size of the illumination that led light source provides, the illumination output that is input as led light source of illumination photometer circuit, the output of illumination photometer circuit is connected with the input of control circuit, and the input of LCD display module connects the output of control circuit.
5, testing light source system according to claim 4, it is characterized in that: described illumination photometer circuit comprises silicon photocell, amplifier, selective circuit of measuring range and A/D convertor circuit, silicon photocell, amplifier, the A/D convertor circuit cascade connects, selective circuit of measuring range is connected with amplifier, the silicon photocell induction detects the luminosity of led light source, convert optical signal to the signal of telecommunication, amplifier is regulated the multiplication factor of selective amplifier automatically according to selective circuit of measuring range, the signal of telecommunication of silicon photocell output is amplified, export to A/D convertor circuit, A/D convertor circuit becomes data signal to be sent in the control circuit analog-signal transitions of input.
6, testing light source system according to claim 1 is characterized in that: described control circuit comprises single-chip microcomputer and peripheral circuit, and peripheral circuit comprises interface conversion circuit and anti-jamming circuit.
7, testing light source system according to claim 1, it is characterized in that: described drive circuit is made of voltage up converting circuit, D/A converting circuit and current driving circuit, voltage up converting circuit is pressed for led light source provides galvanic current, D/A converting circuit will be provided with and the data signal of control circuit output is converted to aanalogvoltage, via current driving circuit, convert aanalogvoltage to corresponding Constant Direct Current electric current.
CNA200610035556XA 2006-05-15 2006-05-15 Image sensor testing light source system Pending CN101074762A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101521968A (en) * 2008-02-27 2009-09-02 立锜科技股份有限公司 Current regulator and control method thereof
CN101610622A (en) * 2008-06-18 2009-12-23 深圳富泰宏精密工业有限公司 LED light source system
CN102307415A (en) * 2010-10-27 2012-01-04 长春理工大学 Star simulator and illumination system of star simulator
CN102314833A (en) * 2010-07-07 2012-01-11 周锡卫 Positive-negative (PN) group based generalized photoelectrical intelligent sensor and display screen dimming system and method
CN104535807A (en) * 2014-12-25 2015-04-22 上海华岭集成电路技术股份有限公司 Light source structure
CN106658860A (en) * 2017-01-11 2017-05-10 深圳怡化电脑股份有限公司 Light source drive control circuit and method of image sensor
CN106908715A (en) * 2017-03-23 2017-06-30 张家港市欧微自动化研发有限公司 A kind of test system for linear transducer
CN113188775A (en) * 2021-07-02 2021-07-30 成都康拓兴业科技有限责任公司 Aviation anticollision lamp flash frequency tester

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101521968A (en) * 2008-02-27 2009-09-02 立锜科技股份有限公司 Current regulator and control method thereof
CN101521968B (en) * 2008-02-27 2014-03-19 立锜科技股份有限公司 Current regulator and control method thereof
CN101610622A (en) * 2008-06-18 2009-12-23 深圳富泰宏精密工业有限公司 LED light source system
CN102314833A (en) * 2010-07-07 2012-01-11 周锡卫 Positive-negative (PN) group based generalized photoelectrical intelligent sensor and display screen dimming system and method
CN102307415A (en) * 2010-10-27 2012-01-04 长春理工大学 Star simulator and illumination system of star simulator
CN102307415B (en) * 2010-10-27 2014-01-15 长春理工大学 Star simulator and illumination system of star simulator
CN104535807A (en) * 2014-12-25 2015-04-22 上海华岭集成电路技术股份有限公司 Light source structure
CN106658860A (en) * 2017-01-11 2017-05-10 深圳怡化电脑股份有限公司 Light source drive control circuit and method of image sensor
CN106658860B (en) * 2017-01-11 2018-09-11 深圳怡化电脑股份有限公司 A kind of the light source drive control circuit and method of imaging sensor
CN106908715A (en) * 2017-03-23 2017-06-30 张家港市欧微自动化研发有限公司 A kind of test system for linear transducer
CN113188775A (en) * 2021-07-02 2021-07-30 成都康拓兴业科技有限责任公司 Aviation anticollision lamp flash frequency tester

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