CN104422817A - Device for detecting LED module - Google Patents
Device for detecting LED module Download PDFInfo
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- CN104422817A CN104422817A CN201310407357.7A CN201310407357A CN104422817A CN 104422817 A CN104422817 A CN 104422817A CN 201310407357 A CN201310407357 A CN 201310407357A CN 104422817 A CN104422817 A CN 104422817A
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Abstract
The invention relates to a device for detecting an LED module, which is used for detecting the property of the LED module as well as transmitting the LED module. The LED module comprises a plurality of light-emitting bodies, wherein each light-emitting body comprises an LED and a lens; the device comprises a transmitter, a measurement unit, a measurement unit conveying unit, an electric power supplying unit, a calculating unit and a main body, wherein the transmitter transmits the LED module so as to manufacture the LED module; the measurement unit is used for measuring the property of the LED module; the measurement unit conveying unit is used for conveying the measurement unit according to the LED module; the electric power supply unit is used for supplying electric power to the LED module as a measurement object; the calculating unit controls the operation of the electric power supplying unit and the measurement unit conveying unit, and outputs control signals corresponding to the measurement result of the measurement unit; the main body is internally provided with the transmitter, the electric power supplying unit, the measurement unit and the calculating unit, so that when the LED module is manufactured, the property of each light-emitting body can be inspected automatically via the module conveying period of the production line.
Description
Technical field
The present invention relates to the device for detecting light emitting diode (LED) module, relating more specifically to the device for detecting various types of LED module, the time required for detection can be reduced thus.
Background technology
Along with the demand of display device is in every way in continuous growth, the various display devices such as such as liquid crystal display (LCD) equipment, plasma display (PDP), electroluminescent display (ELD) and vacuum fluorescent display (VFD) have been studied and have been come into operation.
In these display devices, the liquid crystal panel of LCD comprises liquid crystal layer, thin film transistor (TFT) (TFT) substrate and colored optical filtering substrates, has above-mentioned liquid crystal layer and the two is facing with each other between both thin film transistor base plate and colored optical filtering substrates.Liquid crystal panel comprises light emitting diode (LED) module for generation of light, this light emitting diode as back light unit to be provided for showing the light of image.
Fig. 1 illustrates the example of the structure of LED module 10.
With reference to figure 1, LED module 10 comprises multiple luminophor 12, luminophor 12 with arranged at predetermined intervals on the bar 11 with predetermined length and width.Can increase or reduce the quantity of the luminophor 12 that will arrange as required.
Fig. 2 illustrates the structure being wherein furnished with the LED module 10 shown in multiple Fig. 1.
Single led module 10 as shown in Figure 1 can be arranged, or multiple LED module 10 as shown in Figure 2 can be arranged.The quantity of LED module 10 is not limited to situation as shown in the figure, but can increase according to the needs of user or reduce.
Fig. 3 be a diagram that the planimetric map of the shape of the luminophor 12 shown in Fig. 1, and Fig. 4 be a diagram that the cross-sectional view of the structure of the luminophor 12 shown in Fig. 3.
With reference to figure 3 and Fig. 4, luminophor 12 comprises LED14 and lens 16 separately, and lens 16 cover LED14 and also allow the light penetrated from LED14 to be uniformly illuminated in a predetermined direction.
Lens 16 can be non-spherical lenses, make the light penetrated from LED14 can easily diffuse scattering.Although placed single led 14 in figs. 3 and 4, the collector (collector) of multiple LED14 also can be comprised.
Here, when manufacturing LED module 10, the electrical characteristics of each luminophor in included multiple luminophors 12 must to be detected in LED module 10, whether qualified or there is defect to carry out determination module self based on the electrical characteristics of each luminophor 12.
But according to the technology of routine, detection operation needs special measured material and the space for sectional fixture according to the model of LED module.Therefore, if release new module, then develop special measured material, and if module stops producing, then the original measured material used is just discarded, thus which results in a large amount of losses for this reason.
In addition, carry out determination module by means of only unlatching luminophor whether qualified or have defect, therefore accuracy of detection is relatively low, and the defect produced after the predetermined amount of time after unlatching can not be found.
Korean Patent KR1101030 can be appointed as prior art of the present invention.
Summary of the invention
The invention provides a kind of light emitting diode (LED) module detecting device, described device can detect the LED module of any module type when detecting LED module.
Present invention also offers a kind of light emitting diode (LED) module detecting device, in said device, multiple luminophor is alternately measured by multiple measuring unit, thus reduces detection time, and detects LED module in real time.
According to an aspect of the present invention, provide a kind of LED module pick-up unit detecting the characteristic of described LED module while conveying light emitting diode (LED) module, described LED module comprises multiple luminophor, each described luminophor comprises LED and lens, described LED module pick-up unit comprises: forwarder, and it carries described LED module to manufacture described LED module; Measuring unit, it measures the characteristic of described LED module; Measuring unit supply unit, it carries described measuring unit according to described LED module; Electric power supply unit, it is to the described LED module supply electric power as measuring object; Computing unit, it controls the operation of described electric power supply unit and described measuring unit supply unit, and exports the control signal of the measurement result corresponding to described measuring unit; And main body, in described main body, be furnished with described forwarder, described electric power supply unit, described measuring unit and described computing unit.
Described forwarder can comprise: the first dividing plate and second partition, and described first dividing plate and described second partition are arranged parallel to each other; Accessory septa, it is parallel to described first dividing plate and described second partition, and is arranged between described first dividing plate and described second partition in a movable manner; Adjuster bar, it is through described first dividing plate or described second partition, and the end of wherein said adjuster bar is rotatably connected to described accessory septa; Fixture, it is arranged on described accessory septa in a movable manner; And cylinder, it moves described fixture.
Described device also can comprise heating unit, described heating unit is for heating the described LED module be arranged on described forwarder and keeping the state of applied heat, wherein said heating unit comprises: heating plate, and it has the form of rectangular slab and is temperature-controllable; Supporting track, it is arranged in the both sides place below described heating plate; And multiple support bar, two ends of each described support bar are connected to described supporting track, and described support bar has adjustable length.
Described multiple support bar can link each other.
Described measuring unit can comprise: voltage measurement unit, and its described multiple luminophors comprised to described LED module are supplied electric power and measure output voltage; Temperature measurement unit, it is measured the temperature of described LED module and exports the signal of correspondence to described computing unit; Overheated sensing cell, it measures the temperature of described electric power supply unit, and shows described temperature when described temperature is in predeterminated level or be greater than described predeterminated level; And Leakage Current measuring unit, it measures the Leakage Current between the heat sink of described LED module and described LED module.
Described voltage measurement unit can comprise: the first voltage measurement unit, the half luminophor supply voltage in its described multiple luminophor comprised to the described LED module be arranged on described measuring unit supply unit, and measures output voltage; And second voltage measurement unit, the half luminophor supply voltage in its described multiple luminophor comprised to the described LED module be arranged on described measuring unit supply unit, and measure output voltage.
Measured voltage transitions is become the signal that can be read by described computing unit with described second voltage measurement unit by described first voltage measurement unit, and exports described signal.
The signal conversion undertaken by described first voltage measurement unit and described second voltage measurement unit is alternately carried out.
Described first voltage measurement unit and described second voltage measurement unit can be arranged in a movable manner along X-axis and Y-axis.
Described measuring unit supply unit can comprise the pair of tracks of arranging abreast, and measures the described LED module as detected object.
Described measuring unit supply unit comprises rectilinear motion (LM) guide rail.
The voltage correction exported from described first voltage measurement unit and described second voltage measurement unit is Current value by described computing unit, wherein, carries out described correction according to equation 1 below and equation 2.
[equation 1]
Gain=(High Current(mA)–Low Current(mA))/(Measure High-Measure Low)，
Offset=Low Current(mA)–(Gain*Measure Low)，
High Current, Low Current is the output current (400 milliamperes, 10 milliamperes) expected,
Measure High, Measure Low is measured output current,
Wherein, according to the mode that equation 2 represents, the offset calculated based on equation 1 can be applied to output current below:
[equation 2]
Current=CalData*CurrentConst
CalData=(Current*Gain)+Offset
The unique value of CurrentConst for being calculated by the calculating in design time,
Gain, Offset are the offset of the respective channel produced in compensation value calculation process,
CalData is that application has offset and is actually transferred to the value of digital-to-analogue (D/A) converter.
Described overheated sensing cell has the measuring accuracy in units of 0.5 DEG C.
Accompanying drawing explanation
Explain exemplary embodiment of the present invention by reference to accompanying drawing, of the present invention above and other feature and will become more apparent a little, these accompanying drawings comprise:
Fig. 1 illustrates the example of light emitting diode (LED) module;
Fig. 2 illustrates the example of the structure being wherein furnished with the LED module shown in multiple Fig. 1;
Fig. 3 illustrates the planimetric map of the shape of the luminophor shown in Fig. 1;
Fig. 4 be a diagram that the cross-sectional view of the structure of the luminophor shown in Fig. 3;
Fig. 5 be a diagram that the stereographic map of the structure of the device for detecting LED module according to the embodiment of the present invention;
Fig. 6 illustrates the example of the layout of the measuring unit used according to the embodiment of the present invention;
Fig. 7 be a diagram that the exploded perspective view of the structure of the forwarder, measuring unit supply unit and the heating plate that use according to the embodiment of the present invention; And
Fig. 8 shows the curve map of the operation of the first voltage measurement unit and the second voltage measurement unit used according to embodiments of the invention.
Embodiment
Hereinafter, exemplary embodiment of the present invention is explained with reference to accompanying drawing.
Fig. 5 be a diagram that the stereographic map of the structure of the device for detecting LED module according to the embodiment of the present invention.Fig. 6 illustrates the example of the layout of the measuring unit used according to the embodiment of the present invention.Fig. 7 be a diagram that the exploded perspective view of the structure of the forwarder, measuring unit supply unit and the heating plate that use according to the embodiment of the present invention.
With reference to Fig. 5-7, comprise forwarder 130, measuring unit supply unit 120, heating plate 140, power supply unit 150, measuring unit 170, computing unit 180 and main body 110 according to the embodiment of the present invention for the device 100 detecting LED module.
With reference to Fig. 5-7, the structure according to the device 100 for detecting LED module of present example of the present invention is described, and also the determination of the defective LED module of tool will be described.
First, the LED module 10 as detected object is arranged.To be positioned over as the LED module 10 of detected object on forwarder 130 that main body 110 is arranged.Can LED module 10 be preferably positioned on forwarder 130, LED module 10 be arranged on (not shown) in the bracket with preliminary dimension simultaneously.
Here, main body 110 provides the detection position of LED module 10, and the element being used for detecting LED module 10 illustrated after a while can be arranged in main body 110.As shown in Figure 2, the multiple LED modules 10 as detected object can be placed and detect, or single led module 10 as shown in Figure 1 can be placed and detect.
According to present example of the present invention, although main body 110 is tables' forms with predetermined altitude, it also can according to user need be formed as other various shape.And main body 110 can be equipped with wheel to move to the place of needs, or can be fixed to the place of needs.
Supply power to the LED module of the inspection positions be placed in main body 110.For this purpose, electric power supply unit 150 can be arranged in the pre-position in main body 110.According to the needs of user, the position of electric power supply unit 150 can be set in different ways.Electric power supply unit 150 can supply the electric power of steady current and the constant voltage arranged by user to LED module 10.Here, according to the type detected, electric current and the voltage of the electric power by using electric power supply unit 150 to supply can be revised.
Electric power by using electric power supply unit 150 to supply is fed to LED module 10 by the connecting end portion 124 by illustrating after a while.
Electric power supply unit 150 can comprise the field effect transistor (FET) as switchgear, for providing steady current.The switchgear that FET is used as in electric power supply unit 150 is well known in the art, therefore, will the detailed description to FET be omitted.
By the mode of operation using the computing unit 180 illustrated after a while to carry out control power supply unit 150.
Computing unit 180 is disposed in the pre-position in main body 110, and exports control signal, and this control signal corresponds to the pass the result of the measurement using the element that comprises of measuring unit 170 to carry out.And computing unit 180 additionally can comprise communication unit 151 externally to notify the mode of operation of pick-up unit.
Reference numeral 20 in unaccounted Fig. 6 represents barcode scanner, and this barcode scanner checks the sequence number as the LED module of detected object, to classify to LED module.That is, in order to classify, bar code is pasted onto as on the LED module of detected object, and identify that pasted bar code is to classify by barcode scanner 20.Therefore, before LED module being arranged on forwarder 130, barcode scanner 20 can be used to check the sequence number of LED module 10, and can between detection period in determine the defective product of tool, and then in auxiliary display screen, the sequence number of the LED module detected can be shown to operator.
Here, when classifying to the LED module as detected object, can according to the recognition device needing use different of user.
Be placed in main body 110 by forwarder 130, measuring unit supply unit 120 and heating plate 140, with LED conveying module 10 respectively, conveying measuring unit 170 also heats LED module 10.
Foregoing will be illustrated in greater detail.
With reference to figure 7, the forwarder 130 it being provided with LED module 10 is positioned on the measuring unit supply unit 120 illustrated after a while, and the heating plate 140 illustrated after a while is placed on below measurement supply unit 120.
When being arranged on forwarder 130 by LED module 10, forwarder 130 is in a predetermined direction and with predetermined transporting velocity LED conveying module 10.
In the accompanying drawings, LED module 10 is eliminated for simplifying accompanying drawing.
Forwarder 130 is configured the width making to regulate forwarder 130 according to the quantity of the LED module 10 as detected object to be placed.As shown in Figure 7, forwarder 130 comprises and has preliminary dimension and the first dividing plate 131a of arranging abreast and second partition 131b, and accessory septa 132 is arranged between the first dividing plate 131a and second partition 131b abreast relative to the first dividing plate 131a and second partition 131b.
The first dividing plate 131a in first dividing plate 131a and second partition 131b or second partition 131b by relative to these divider upright the adjuster bar 134 arranged be connected to accessory septa 132.In detail, the end of adjuster bar 134 is rotatably connected to accessory septa 132.Adjuster bar 134 connects in the mode through the first dividing plate 131a or second partition 131b.Here, mobile in order to make accessory septa 132 be convenient to via adjuster bar 134, screw thread can be formed on the outer surface of adjuster bar 134, and the nut being connected to adjuster bar 134 can be fixed on the first dividing plate 131a or second partition 131b.
Meanwhile, the handle handled is connected to the other end of adjuster bar 134 by user, but, according to the needs of user, motor can be connected to replace handle.
Therefore, when user's rotary handle, adjuster bar 134 rotates, to change the distance between accessory septa 132 and first and second dividing plate 131a, 131b.
In addition, fixture 133 is arranged on accessory septa 132.Detect position and when detecting when LED module 10 arrives, fixture 133 is configured to allow accessory septa 132 transverse shifting when user's rotary handle.When accessory septa 132 moves, fixture 133 contacts the side surface of LED module 10, keeps LED to stablize thus.
Fixture 133 moves forward or backward along accessory septa 132 by cylinder (not shown in FIG.) on accessory septa 132.Can by the operation of the operative association of cylinder to forwarder 130.
Fixture 133 can contact the side of the bracket installing and be fixed with LED module 10, to prevent rocking of bracket during detection operation.
The measuring unit 170 illustrated after a while is transported to required position by measuring unit supply unit 120, simultaneously by forwarder 130 LED conveying module, thus can detect the electrical characteristics of LED module.
Measuring unit supply unit 120 comprises delivery track 122 and contact end portion 124.
Delivery track 122 can move the position of the contact end portion 124 illustrated after a while according to the length of the LED module as detected object.
Delivery track 122 comprises a pair track parallel to each other.Rectilinear motion (LM) guide rail can be used as delivery track.
Contact end portion 124 can contact two ends of LED module 10, thus supplies electric power for LED module 10.
Heating plate 140 can be arranged in below forwarder 130.
Heating plate 140 allows LED module 10 to stop in high temperature environments, thus can measure the thermotolerance of LED module.
Heating plate 140 applies heat with predetermined temperature to LED module 10, thus LED module 10 keeps the condition of high temperature.Here, the scope of the temperature that the heating plate 140 used in the present embodiment of the invention keeps can be preferably 0 DEG C to about 200 DEG C.
Heating plate 140 has rectangular shape and predetermined area.The area of heating plate 140 may correspond to the size in the carrier being provided with the LED module 10 as detected object.
Supporting track 142 is arranged in abreast the both sides place below heating plate 140.Supporting track 142 is connected by using multiple height-adjustable support bar 144 with heating plate 140.Can change the length of multiple support bar 144 as required, and support bar 144 is together with operation.Therefore, can flatly keep heating plate 140, and if only if when needing heating LED module 10, hot plate 140 can be promoted.
The contact end portion 124 contacted with the end of LED module 10 is connected to measuring unit 170, makes to send signal from contact end portion 124.
Measuring unit 170 can measure the characteristic of the LED module 10 carried by forwarder 130.Here, the characteristic of LED module 10 comprises forward voltage, temperature and Leakage Current.
In order to the characteristic by using measuring unit 170 to measure LED module 10, the contact end portion 124 contacted with two ends of LED module 10 is arranged in two ends of measuring unit supply unit 120.Contact end portion 124 is arranged in mode facing with each other two ends contacting LED module 10.
Contact end portion 124 is arranged to move by delivery track 122, and corresponds to the length as the LED module 10 of detected object.And contact end portion 124 is arranged in a movable manner along X-axis, Y-axis and Z axis.Mobile motor can preferably be arranged on each axle in X-axis, Y-axis and Z axis, with moving contact end 124.
Measuring unit 170 comprises voltage measurement unit 172, temperature measurement unit 174 and Leakage Current measuring unit 178.
Voltage measurement unit 172 can measure the forward voltage Vf of luminophor 12 included in LED module 10.
Because LED module 10 comprises multiple luminophor 12, so be sequentially fed to multiple luminophor 12 to the electric power of LED module 10 supply, and LED14 included in luminophor 12 is luminous according to supplied electric power.After LED14 sends light, the voltage of the lead-out terminal of LED14 is reduced to predetermined level or lower.When the amount of the voltage through reducing at the lead-out terminal place of LED14 is greater than setting level, LED14 can be defined as faulty goods.Such as, if the amount of the voltage drop of qualified LED14 is set as 0.05V, and the voltage of actual measurement is more than 0.05V, then the LED module 10 including LED to be measured can be defined as faulty goods.
Here, voltage measurement unit 172 comprises the first voltage measurement unit 172a and the second voltage measurement unit 172b.
First voltage measurement unit 172a and the second voltage measurement unit 172b can measure the forward voltage of the half luminophor 12 in multiple luminophors 12 that LED module 10 comprises, and the signal that the magnitude of voltage of measurement can be converted to by using computing unit 180 to read, to export this signal.
Because measured magnitude of voltage is simulating signal, so the first voltage measurement unit 172a and the second voltage measurement unit 172b can be analog to digital converter (ADC), measured voltage (i.e. simulating signal) is converted to the digital signal by using computing unit 180 to read by this ADC.
And the first voltage measurement unit 172a and the second voltage measurement unit 172b alternately operates.Therefore, when the first voltage measurement unit 172a measuring voltage and when changing and export this voltage, the computing unit 180 illustrated after a while processes the output signal of the second voltage measurement unit 172b; And when the second voltage measurement unit 172b measuring voltage and when changing and export this voltage, the computing unit 180 illustrated after a while processes the output signal of the first voltage measurement unit 172a.
According to present example of the present invention, LED module 10 can comprise 48 luminophors 12.First voltage measurement unit 172a and the second voltage measurement unit 172b can the forward voltage Vf of 24 luminophors 12 in 48 luminophors 12 comprising of each measurement LED module 10, and exports the signal corresponding to measurement result.
Computing unit 180 can receive the measured value of measuring unit 170 and process this measured value, and the exportable signal corresponding to handled measured value.And computing unit 180 can the operation of controlled processing unit supply unit 120 and electric power supply unit 150.
Here, the connection between computing unit 180 and voltage measurement unit 172 will be described.
Computing unit 180 can receive the signal exported from the first voltage measurement unit 172a and the second voltage measurement unit 172b, to check the forward voltage measured by LED14, and the exportable control signal corresponding to measured forward voltage.
Foregoing will be illustrated in greater detail.
The microprocessors receiving and process 16 signals according to computing unit 180 used in the present invention.The microprocessor of 16 bit is well known in the art, and thus, will omit the explanation to it.Microprocessor as computing unit 180 can also be 8-bit microprocessor or 32-bit microprocessor etc. beyond the microprocessor of 16 bit.
The figure place no matter being used as the microprocessor of computing unit 180 is how many, and the conversion speed of computing unit 180 is faster than signal measurement and the speed of conversion and the signal output speed of ADC.Therefore, signal input and the T.T. needed for signal transacting can be comprised in the pause period of computing unit 180.
Hereinafter, will the embodiment that single ADC be adopted as voltage measurement unit be described.
When the DATA REASONING of single ADC and data change each needs 1 millisecond (ms), and use conventional method, namely, when order carries out the method for data conversion and collection, so measuring the forward voltage Vf comprising the LED module 10 of 48 luminophors 12 needs 96 milliseconds.
In this case, do not have extra to export when single ADC to measure measured value and changes this measured value, and computing unit 180 can not carry out any operation bidirectional.Therefore, the time of 96 milliseconds comprises the time out of computing unit 180.
In order to the time out by getting rid of computing unit 180 reduces the whole processing time, preferably signal transacting can be carried out as follows.
The first voltage measurement unit 172a and the second voltage measurement unit 172b can be arranged, and the first voltage measurement unit 172a and the second voltage measurement unit 172b alternately operates, and the signal exported from the first voltage measurement unit 172a and the second voltage measurement unit 172b alternately can be input to computing unit 180.And computing unit 180 continuously processes the signal alternately inputted.
Fig. 8 shows the curve map of the operation of the first voltage measurement unit and the second voltage measurement unit used according to embodiments of the invention.With reference to figure 8, when the first voltage measurement unit 172a and the second voltage measurement unit 172b converts the forward voltage of measurement to digital signal, computing unit 180 obtains the data of the first voltage measurement unit 172a or the second voltage measurement unit 172b, and the signal that arrangement and calculating obtain, to check the forward voltage of signal.
Refer again to Fig. 8, t1 represents that computing unit 180 arranges and calculate the time period of obtained data.T2 represent when the first voltage measurement unit 172a the voltage transitions of measurement is become digital signal while computing unit 180 obtain from second voltage measurement unit 172b export digital signal to process the time period of this digital signal, t3 then represent when the second voltage measurement unit 172b the voltage transitions of measurement is become digital signal while computing unit 180 obtain from first voltage measurement unit 172a export digital signal to process the time period of this digital signal.As shown in Figure 8, t1 is less than t2 or t3.
As mentioned above, when the first voltage measurement unit 172a and the second voltage measurement unit 172b alternately operates, the time needed for forward voltage measurement that computing unit 180 performs can reduce half.
For aforesaid operations, the first voltage measurement unit 172a and the second voltage measurement unit 172b can preferably include all with multiple LED14+terminal and the-electric power supply end that contacts of terminal and voltage measurement end.The quantity of electric power supply end and voltage measurement end corresponds to the maximum quantity of the LED14 in use first voltage measurement unit 172a and the second voltage measurement unit 172b measured by each.
Multiple electric power supply end side by side contacts multiple LED14 with voltage measurement end and the voltage of proceeding measurement LED14.
When detecting the electrical characteristics of LED module 10, need the superheat state measuring electric power supply unit 150, to supply electric power exactly.
For this purpose, temperature measurement unit 174 can preferably be arranged in electric power supply unit 150.In detail, temperature measurement unit 174 preferably can be arranged to the temperature for measuring FET, and this FET supplies the steady current that electric power supply unit 150 uses.
The temperature measurement unit 174 being included in the temperature also measuring the FET for supplying steady current in electric power supply unit 150 can preferably be arranged in electric power supply unit 150.
Temperature measurement unit 174 measures the temperature of the FET of electric power supply unit 150, and exports the signal corresponding to measured temperature to computing unit 180.Temperature measurement unit 174 can precision measure temperature preferably in units of 0.5 DEG C.And temperature measurement unit 174 is measured the temperature of each scheduled time slot and is outputed signal.According to present example of the present invention, temperature measurement unit 174 preferably can measure a temperature in every 5 seconds.And temperature measurement unit 174 preferably can spend the cycle measuring tempeature of 12 milliseconds or less.
According to the needs of user, can increase or reduce thermometric measuring accuracy and the time interval of the temperature measurement unit 174 that present example according to the present invention uses.
The output signal exported from temperature measurement unit 174 is imported into computing unit 180.Whether computing unit 180 compares the temperature of electric power supply unit 150 and the mode of operation of LED14, operate to defect to determine whether there is the external component such as circuit defect or such as ventilating fan, and exports corresponding error message.
Meanwhile, except the measurement of output voltage, LED module 10 also needs the measurement of output current.That is, due to the mismachining tolerance of the parts of the home loop for forming electric power supply unit, the electric power that the electric power being provided to LED module 10 needs somewhat different than user.Therefore, this electric power difference must be corrected.
Carry out the correction of electric power difference in the following manner.
By minimum current (such as, 10 milliamperes; LI) LED14 is applied to, to open LED14.After opening LED14, measure the current MLI exported from LED14.Then, by maximum current (such as, 400 milliamperes; HI) LED14 is applied to, to open LED14.After opening LED14, measure the current MHI exported from LED14.
When respectively above-mentioned electric current being applied to LED14 with after opening LED14, compare the electric current exported from LED14, with offset value calculation.
The calculating of value can be compensated based on equation 1 below.
[equation 1]
Gain=(HI(mA)–LI(mA))/(MHI-MLI)
Offset (Offset)=LI (mA) – (Gain*MLI)
HI: maximum current, LI: minimum current
MHI: the electric current measured after applying maximum current
MLI: the electric current measured after applying minimum current
According to the mode represented by equation 2 below, the offset calculated can be applied to output current Output current based on above equation 1.
[equation 2]
Output current=CalData*CurrentConst
CalData=(Current*Gain)+Offset
CurrentConst: the unique value calculated by the calculating in the design phase.
Gain, Offset: the offset of the respective channels produced in compensation value calculation process
CalData: application has offset and the actual value being transported to digital-to-analogue (D/A) converter.
As mentioned above, except the yield value of theory calculate, computing unit 180 also exportable application has Gain, the value of Offset value, and Gain, Offset value is used and the value calculated in trimming process at timing.Here, due to computing unit 180 output digit signals, so need to convert this digital signal to simulating signal for control power supply unit 150.For this reason, between computing unit 180 and electric power supply unit 150, be furnished with the D/A converter (DAC of the signal for changing computing unit 180; Digital to analog converter) 176.
Need to measure the leakage of current between LED14 and heat sink 11.
That is, must measure LED14 that LED module 10 comprises and for the heat produced during the light emission operation of LED14 is left heat sink 11 between leakage of current.
When normal LED module 10, when the voltage of 900v is applied to LED module 10, between each LED14 and heat sink 11, sense 100 microamperes or less electric current.But, if there is leakage of current, the electric current larger than this can be sensed.Therefore, in order to current sensor is revealed, Leakage Current sensing cell 187 is included.Leakage Current sensing cell 178 measures the electric current between LED14 and heat sink 11, thus exports the signal corresponding to measured value to computing unit 180.Computing unit 180 carrys out the leakage of current sensor according to the electric current measured, and exports the signal corresponding to leakage of current.
The ends contact heat sink 11 of Leakage Current measuring unit 178, and the signal wire of Leakage Current measuring unit 178 is connected to computing unit 180.
According to the present invention of such as above-mentioned configuration, when manufacturing LED module, automatically can check the characteristic of each luminophor in via the module course of conveying of production line.
According to embodiments of the invention, when manufacture comprise the LED module of multiple luminophor time, automatically can check the characteristic of each luminophor in via the module course of conveying of production line.
Although show and describe the present invention in detail by reference to exemplary embodiment of the present invention, but it will be understood by those of skill in the art that the amendment can carried out when not departing from the spirit and scope of the present invention defined by claim in various forms and details.
Claims (13)
1. while LED conveying module, detect a LED module pick-up unit for the characteristic of described LED module, described LED module comprises multiple luminophor, and each described luminophor comprises LED and lens, and described LED module pick-up unit comprises:
Forwarder, it carries described LED module for the manufacture of described LED module;
Measuring unit, it measures the characteristic of described LED module;
Measuring unit supply unit, it carries described measuring unit according to described LED module;
Electric power supply unit, it is to the described LED module supply electric power as measuring object;
Computing unit, it controls the operation of described electric power supply unit and described measuring unit supply unit, and exports the control signal of the measurement result corresponding to described measuring unit; And
Main body, is furnished with described forwarder, described electric power supply unit, described measuring unit and described computing unit in described main body.
2. LED module pick-up unit as claimed in claim 1, wherein, described forwarder comprises:
First dividing plate and second partition, they are arranged parallel to each other;
Accessory septa, it is parallel to described first dividing plate and described second partition, and is arranged between described first dividing plate and described second partition in a movable manner;
Adjuster bar, it is through described first dividing plate or described second partition, and the end of wherein said adjuster bar is rotatably connected to described accessory septa;
Fixture, it is arranged on described accessory septa in a movable manner; And
Cylinder, it moves described fixture.
3. LED module pick-up unit as claimed in claim 1, it also comprises heating unit, the state that described heating unit also keeps for applying heat to the described LED module be arranged on described forwarder the heat applied,
Wherein, described heating unit comprises:
Heating plate, it has the form of rectangular slab and is temperature-controllable;
Supporting track, it is arranged in the both sides place below described heating plate; And
Multiple support bar, two ends of each described support bar are connected to described supporting track, and described support bar has adjustable length.
4. LED module pick-up unit as claimed in claim 3, wherein, described multiple support bar links each other.
5. LED module pick-up unit as claimed in claim 1, wherein, described measuring unit comprises:
Voltage measurement unit, its described multiple luminophors comprised to described LED module are supplied electric power and measure output voltage;
Temperature measurement unit, it is measured the temperature of described LED module and exports the signal of correspondence to described computing unit;
Overheated sensing cell, it measures the temperature of described electric power supply unit, and shows described temperature when described temperature is in predeterminated level or be greater than described predeterminated level; And
Leakage Current measuring unit, it measures the Leakage Current between the heat sink of described LED module and described LED module.
6. LED module pick-up unit as claimed in claim 5, wherein, described voltage measurement unit comprises:
First voltage measurement unit, the half luminophor supply voltage in its described multiple luminophor comprised to the described LED module be arranged on described measuring unit supply unit, and measure output voltage; And
Second voltage measurement unit, the half luminophor supply voltage in its described multiple luminophor comprised to the described LED module be arranged on described measuring unit supply unit, and measure output voltage.
7. LED module pick-up unit as claimed in claim 6, wherein, measured voltage transitions is become the signal that can be read by described computing unit with described second voltage measurement unit by described first voltage measurement unit, and exports described signal.
8. LED module pick-up unit as claimed in claim 7, wherein, the signal conversion performed by described first voltage measurement unit and described second voltage measurement unit is alternately carried out.
9. LED module pick-up unit as claimed in claim 6, wherein, described first voltage measurement unit and described second voltage measurement unit are arranged in a movable manner along X-axis and Y-axis.
10. LED module pick-up unit as claimed in claim 1, wherein, described measuring unit supply unit comprises the pair of tracks of arranging abreast, and measures the described LED module as detected object.
11. LED module pick-up units as claimed in claim 10, wherein, described measuring unit supply unit comprises linear motion guide rail.
12. LED module pick-up units as claimed in claim 1, wherein, the voltage correction exported from described first voltage measurement unit and described second voltage measurement unit is current value Current by described computing unit, wherein, carries out described correction according to equation 1 below and equation 2:
[equation 1]
Gain=(High Current(mA)–Low Current(mA))/(Measure High-Measure Low)
Offset=Low Current(mA)–(Gain*Measure Low)
High Current and Low Current is the output current (400mA, 10mA) expected,
Measure High and Measure Low is the output current measured,
Wherein, according to the mode that equation 2 represents, the offset calculated based on equation 1 can be applied to output current Output current below:
[equation 2]
Current=CalData*CurrentConst
CalData=(Current*Gain)+Offset
CurrentConst is the unique value calculated by the calculating in design time,
Gain, Offset are the offset of the respective channel produced in compensation value calculation process,
CalData is that application has offset and is actually transferred to the value of digital to analog converter.
13. LED module pick-up units as claimed in claim 1, wherein, described overheated sensing cell has the measuring accuracy in units of 0.5 DEG C.
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| US11656181B2 (en) | 2018-12-21 | 2023-05-23 | Industrial Technology Research Institute | Inspection apparatus and inspection method for inspecting light-emitting diodes |
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