CN103841721A - LED module correction system and correction method thereof - Google Patents
LED module correction system and correction method thereof Download PDFInfo
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Abstract
The invention provides a correction system and a correction method of a light-emitting diode module. When the LED module is used, the condition of the LED module can be known by contrasting the comparison table obtained during the production of the LED module, thereby achieving the product design with low cost and high reliability.
Description
Technical field
The invention relates to a kind of light-emitting diode (LED) module corrective system and bearing calibration thereof, and particularly about a kind of light-emitting diode corrective system and bearing calibration thereof with built in detecting device.
Background technology
The luminosity of LED matrix is proportional to its forward drive current, and drive current is crossed conference and caused LED matrix optical attenuation, can affect the luminous intensity of LED matrix when drive current is too small, therefore the driving of LED matrix need provide constant-current supply.And LED matrix type of drive can be divided into and determines voltage and drive and determine current drives, but LED matrix determines voltage and drives easily because of the error of voltage forward as used, and causes the electric current of inflow LED matrix unstable.
Therefore in most illumination application, the general current drives method of determining that adopts of LED matrix, regulate the work period of LED matrix to reach stable LED matrix drive current to detect electric current and to control fixing forward drive current, and then maintain the luminosity of LED matrix.
Detect the mode of LED matrix electric current for using a current sense resistor (Sense Resistor), the voltage at current sense resistor two ends is directly proportional to electric current to be measured, therefore can measure the electric current of LED matrix.In existing LED matrix, current sense resistor is placed in to the inside of LED drive IC, so can reduce LED circuit plate (Printed Circuit Board, PCB) element, reduce by this manufacturing cost, but said method is because learning the actual drive current of LED, therefore integral LED device is not more had a reliability.
Summary of the invention
The object of the present invention is to provide a kind of light-emitting diode (LED) module corrective system and bearing calibration thereof, can more accurately obtain the state information of LED matrix, improve by this LED matrix reliability.
Therefore, an execution mode of a structure aspect of the present invention is that a kind of light-emitting diode (LED) module corrective system is being provided, and it comprises a light-emitting diode (LED) module, an external monitoring unit, memory comparing unit and a correcting unit.Light-emitting diode (LED) module comprises a light emitting diode, a control unit, a signal conversion unit and an internal monitoring unit.Control unit output one first input signal, signal conversion unit is changed the first input signal into one second input signal, signal conversion unit is exported the second input signal control light emitting diode, and internal monitoring unit monitoring light emitting diode is also exported one first output state.External monitoring unit is electrically connected light-emitting diode (LED) module, and external monitoring unit is monitored light-emitting diode (LED) module and exports one second output state.Memory comparing unit is electrically connected light-emitting diode (LED) module, external monitoring unit and internal monitoring unit, and memory comparing unit is compared and remembers generation one deck watch for calibration backward.Correcting unit is electrically connected light-emitting diode (LED) module, memory comparing unit and external monitoring unit, and correcting unit is exported a command signal in order to order light-emitting diode (LED) module.
According to one embodiment of the invention, above-mentioned light-emitting diode (LED) module corrective system also can comprise a debug unit, is electrically connected light-emitting diode (LED) module and correcting unit, in order to confirm whether light-emitting diode (LED) module normally works.And deck watch exports an external connection display apparatus to.Above-mentioned deck watch comprises command signal, the second input signal, the first output state and the second output state.Mentioned order signal can be an initial output brightness ratio of light emitting diode, the second input signal can be an initial driving current value of light emitting diode or a conversion output brightness ratio of light emitting diode, the first output state can be a working period values of light emitting diode, and the second output state can be an actual driving current value of light emitting diode.And above-mentioned actual driving current value, working period values, initial driving current value, initial output brightness ratio and conversion output brightness ratio can be multiple.
The first above-mentioned output state be light emitting diode open short circuit value, voltage, electric current, colour temperature or brightness.The second output state be light emitting diode open short circuit value, voltage, electric current, colour temperature or brightness.Above-mentioned light-emitting diode (LED) module also comprises a driver element and a transmission unit.
One execution mode of a method aspect of the present invention is in the bearing calibration that a kind of above-mentioned light-emitting diode (LED) module corrective system is provided, and it comprises makes correcting unit export a command signal to control unit; Make control unit export the first input signal; Make signal conversion unit change the first input signal and export the second input signal; Make internal monitoring unit export the first output state; Make external monitoring unit export the second output state; And make to remember comparing unit compare and remember produce deck watch.
According to one embodiment of the invention, above-mentioned deck watch comprises command signal, the second input signal, the first output state and the second output state.Mentioned order signal can be an initial output brightness ratio of light emitting diode, the second input signal can be an initial driving current value of light emitting diode or a conversion output brightness ratio of light emitting diode, the first output state can be a working period values of light emitting diode, and the second output state can be an actual driving current value of light emitting diode.And above-mentioned actual driving current value, working period values, initial driving current value, initial output brightness ratio and conversion output brightness ratio can be multiple.
The first above-mentioned output state be light emitting diode open short circuit value, voltage, electric current, colour temperature or brightness.The second output state be light emitting diode open short circuit value, voltage, electric current, colour temperature or brightness.
By light-emitting diode (LED) module corrective system of the present invention and bearing calibration thereof, can correctly obtain a deck watch, output state while comprising driving LED device due to deck watch, relatively the first input signal of this deck watch and control unit, can learn the LED matrix use state of reality at present, and the difference slightly producing can be installed on production for different LED time obtains correct signal by the present invention proofreaies and correct, also can make different LED device output identical result by correction of the present invention.
Accompanying drawing explanation
For above and other object of the present invention, feature, advantage and embodiment can be become apparent, the description of the drawings is as follows:
Fig. 1 illustrates the calcspar according to a kind of light-emitting diode (LED) module corrective system of an embodiment of the present invention.
Fig. 2 illustrates the flow chart according to a kind of light-emitting diode (LED) module bearing calibration of another execution mode of the present invention.
Fig. 3 illustrates the applying step figure according to Fig. 1.
Fig. 4 a illustrates the circuit of LED schematic diagram that is applied to pulsewidth brightness adjustment control according to a kind of light-emitting diode (LED) module corrective system of an embodiment of the present invention.
Fig. 4 b illustrates the circuit of LED schematic diagram that is applied to continuous light tuning control according to a kind of light-emitting diode (LED) module corrective system of an embodiment of the present invention.
Fig. 4 c illustrates another circuit of LED schematic diagram of Fig. 4 b.
Fig. 5 illustrates the output signal of Fig. 4 a and Fig. 4 b relatively to scheme.
Embodiment
Please refer to Fig. 1, it illustrates the corrective system schematic diagram according to a kind of light-emitting diode (LED) module of an embodiment of the present invention.Light-emitting diode (LED) module corrective system comprises a correcting unit 100, a light-emitting diode (LED) module 200, an external monitoring unit 300, memory comparing unit 400, a debug unit 500 and a power supply 600.
Light-emitting diode (LED) module 200 comprises a light emitting diode 210, a control unit 220, a signal conversion unit 230 and an internal monitoring unit 240, a transmission unit 250 and a driver element 260.
Light-emitting diode (LED) module 200 and correcting unit 100 are compared in debug unit 500, in order to confirm whether light-emitting diode (LED) module 200 normally works.
Referring to Fig. 2, it illustrates the bearing calibration flow chart of application drawing 1 corrective system.Step 710, makes correcting unit export a command signal to control unit; Step 720, makes control unit export the first input signal; Step 730, makes signal conversion unit change the first input signal and exports the second input signal; Step 740, makes internal monitoring unit export the first output state; Step 750, makes external monitoring unit export the second output state; Step 760, make to remember comparing unit compare and remember produce deck watch.
Making correcting unit 100 send a command signal CS exports to after light-emitting diode (LED) module 200 by transmission unit 250, control unit 220 receives after the command signal CS of correcting unit 100, export one first input signal Vin1 to signal conversion unit 230 according to command signal CS, and signal conversion unit 230 is changed the first input signal Vin1 into one second input signal Vin2, in present embodiment, the first input signal Vin1 is a pulse width modulation (Pulse Width Modulation, PWM) signal, and the second input signal Vin2 is a linear signal, and signal conversion unit 230 is exported the second input signal Vin2 to the rear control light emitting diode 210 of driver element 260, light emitting diode 210 receives after the second input signal Vin2 corresponding luminous, internal monitoring unit 240 detects light emitting diode 210 and exports one first output state Vout1, external monitoring unit 300 Simultaneous Monitoring light-emitting diode (LED) modules 200 are also exported one second output state Vout2.And memory comparing unit 400 is compared and is remembered and produces a deck watch CT, and deck watch CT is stored in memory comparing unit 400.
Above-mentioned deck watch comprises command signal CS, the second input signal Vin2, the first output state Vout1 and the second output state Vout2.And signal CS, the second input signal Vin2, the first output state Vout1 and the second output state Vout2 can be the actual driving current value of light emitting diode 210, the working period values of light emitting diode 210, initial driving current value, the initial output brightness ratio of light emitting diode 210 and the conversion output brightness ratio of light emitting diode 210 of light emitting diode 210.When correcting unit 100 is inputted different multiple command signal CS, the actual driving current value of above-mentioned light emitting diode 210, working period values, initial driving current value, initial output brightness ratio and the corresponding generation of conversion output brightness ratio are multiple.What more specifically, the first output state Vout1 and the second output state Vout2 comprised light emitting diode 210 opens short circuit value, voltage, electric current, colour temperature or brightness.
Light-emitting diode (LED) module corrective system of the present invention can be applied to the light-emitting diode of pulse duration light modulation (PWM Dimming) and two kinds of brilliance control modes of continuous light tuning (Continuous Dimming).Please refer to Fig. 3, it illustrates the applying step figure according to a kind of light-emitting diode (LED) module corrective system of an embodiment of the present invention.In LED process of producing product, by external monitoring unit and the internal monitoring unit measuring LED state of above-mentioned Fig. 1 corrective system, and set up two corresponding deck watch a and deck watch b via memory comparing unit, and deck watch a and deck watch b are deposited in memory comparing unit.Applying step comprises step 810, by corresponding with the mean value of LED work period measuring each current average of being sent by control unit and set up deck watch a.Step 820, has the test board of current sense resistor to measure the actual drive current of LED with device, and sets up the mean value of LED work period and the deck watch b of actual drive current.
Please refer to Fig. 4 a, Fig. 4 b and Fig. 4 c, wherein Fig. 4 a illustrates above-mentioned corrective system and is applied to the light-emitting diode of pulse duration brightness adjustment control, and Fig. 4 B and 4c illustrate above-mentioned corrective system and be applied to the light-emitting diode of continuous light tuning control.In present embodiment, it is driver element that LED module uses LM3414 (National semiconductor), use LM3414 but do not limit, at this only using this model as explanation, LM3414 is the LED drive IC of a Minoxidil electric current, its contact is described as follows: VCC is the inner voltage stabilizing output contact of LED, PGND is power interface ground contacts, LADJ is that LED average output current regulates contact, GND is analogy ground contact, FS is switching frequency contact, DIM is pulse width modulation brightness adjustment control contact, LX is the contact that connects transistor Q2 switch, Vin is input voltage contact.Above-mentioned external monitoring unit is the test board that a device has current sense resistor in addition, correcting unit is an external computer with default correction software, control unit is a microcontroller (Microcontroller Unit, MCU), memory comparing unit is the memory body in microcontroller, it is preset with microcontroller firmware (Firmware), can in LED test process, add the program of the above-mentioned deck watch of foundation a and deck watch b.
The LED signal instruction of pulse duration brightness adjustment control is as follows: when after the mean value of the contact PWM Dimming of the external computer with default correction software and the current value of Enable output command LED brightness (being the LED work period); via I_ADJ output external resistor; set by this lowest high-current value of LED; and the work period of exporting LED via the contact LX of LM3414; and OLPSCP is electric current and voltage protective circuit; end points Current_Sense is the mean value of the LED work period of external correcting unit output, and it inputs microcontroller.Wherein measure LED current methods and be wire jumper (Jumper) and disconnect in the time of test, the current sense resistor Rs of wire jumper two ends connecting test plate, can set up deck watch b via the actual drive current recording, in the time that test completes by wire jumper short circuit; Measure in addition LED electric current and Current_Sense output and there is correlation, so also can directly measure the output of end points Current_Sense, obtain by this microcontroller output and monitor corresponding LED deck watch.And deck watch a and deck watch b may be output to computer demonstration, for calibration.
The LED signal instruction of continuous light tuning control is as follows: when after the mean value of the current value of the contact PWM_DIM of the external computer with default correction software output command LED brightness; start LED electric current via microcontroller output command Enable; and the work period of exporting LED via the contact LX of LM3414; and OLPSCP is electric current and voltage protective circuit; end points Current_Sense is the mean value of the LED work period of external correcting unit output, and it inputs microcontroller.Wherein measure the LED current measurement method of LED current methods with above-mentioned pulse duration brightness adjustment control, wire jumper (Jumper) disconnects in the time of test, the current sense resistor Rs of wire jumper two ends connecting test plate, can set up deck watch b via the actual drive current recording, in the time that test completes by wire jumper short circuit; Measuring in addition LED electric current and Current_Sense output has correlation, so also can directly measure the output of end points Current_Sense, obtains by this microcontroller output and monitors corresponding LED deck watch.And deck watch a and deck watch b may be output to computer demonstration, for calibration.
Please refer to Fig. 4 a that Fig. 5 illustrates and the output signal of Fig. 4 b and relatively scheme, its output signal that is the LED that shows pulse duration light modulation and continuous light tuning control is relatively schemed.Pulsewidth light modulation and continuous light tuning are all exported the average current of 0.5A.Pulse duration light modulation changes the work period (maximum current of LED is constant, and it is still 1A) of LED, changes by this brightness of LED; But continuous light tuning changes the maximum current (change average current, the work period of LED is constant) of LED, changes by this brightness of LED.
From the invention described above execution mode, application the present invention has following advantages.
1. the present invention can be in conjunction with the drive IC of built-in current sense resistor to reach the product design of low cost and high reliability.
2. correcting unit of the present invention can be revised LED brightness ratio rate and real output value, and output brightness and corresponding monitor value can obtain more accurate LED state by this.
3. the LED releasing on the market also cannot obtain its output state, and collocation the present invention can obtain its output state.
And the characteristic of each LED internal electron part different, even if the difference slightly of same model just may cause application system to be judged by accident.The present invention can assisting user can use the electronic component of different model and different lot numbers, and obtains identical output effect.Can increase by this selection of electronic component, reduce Material Cost (Bill of material, BOM) cost.
5. in the time using LED product, each state deck watch that when contrasting above-mentioned control unit output and producing, LED obtains can learn the situation of LED, and user can proofread and correct LED immediately accurately by this.
Although the present invention with execution mode openly as above; but it is not in order to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; when doing various changes and modification, therefore protection scope of the present invention is when being as the criterion depending on accompanying claims protection range person of defining.
Claims (24)
1. a light-emitting diode (LED) module corrective system, is characterized in that, comprises:
One light-emitting diode (LED) module, it comprises:
One light emitting diode;
One control unit, it exports one first input signal;
One signal conversion unit, it changes this first input signal into one second input signal, and this signal conversion unit is exported this this light emitting diode of the second input signal control; And
One internal monitoring unit, it is monitored this light emitting diode and exports one first output state;
One external monitoring unit, it is electrically connected this light-emitting diode (LED) module, and this external monitoring unit is monitored this light-emitting diode (LED) module and is exported one second output state;
One memory comparing unit, it is electrically connected this light-emitting diode (LED) module, this external monitoring unit and this internal monitoring unit, and this memory comparing unit is compared and is remembered and produces a deck watch for calibration backward; And
One correcting unit, it is electrically connected this light-emitting diode (LED) module, this memory comparing unit and this external monitoring unit, and this correcting unit is exported a command signal in order to order this light-emitting diode (LED) module.
2. light-emitting diode (LED) module corrective system as claimed in claim 1, is characterized in that, also comprises a debug unit, is electrically connected this light-emitting diode (LED) module and this correcting unit, in order to confirm whether this light-emitting diode (LED) module normally works.
3. light-emitting diode (LED) module corrective system as claimed in claim 1, is characterized in that, this deck watch comprises this second output state and this first output state.
4. light-emitting diode (LED) module corrective system as claimed in claim 3, is characterized in that, the actual driving current value that this second output state is this light emitting diode, and the working period values that this first output state is this light emitting diode.
5. light-emitting diode (LED) module corrective system as claimed in claim 4, is characterized in that, this actual driving current value and this working period values are multiple.
6. light-emitting diode (LED) module corrective system as claimed in claim 1, is characterized in that, this deck watch comprises this second input signal and this second output state.
7. light-emitting diode (LED) module corrective system as claimed in claim 6, it is characterized in that, the initial driving current value that this second input signal is this light emitting diode, and the actual driving current value that this second output state is this light emitting diode, wherein this initial driving current value is to should actual driving current value.
8. light-emitting diode (LED) module corrective system as claimed in claim 7, is characterized in that, this initial driving current value and this actual driving current value are multiple.
9. light-emitting diode (LED) module corrective system as claimed in claim 1, is characterized in that, this deck watch comprises this command signal and this second input signal.
10. light-emitting diode (LED) module corrective system as claimed in claim 9, is characterized in that, the initial output brightness ratio that this command signal is this light emitting diode, and the conversion output brightness ratio that this second input signal is this light emitting diode.
11. as the light-emitting diode (LED) module corrective system of claim 10, it is characterized in that, this initial output brightness ratio and this are changed output brightness ratio into multiple.
12. light-emitting diode (LED) module corrective systems as claimed in claim 1, is characterized in that, this first output state be this light emitting diode open short circuit value, voltage, electric current, colour temperature or brightness.
13. light-emitting diode (LED) module corrective systems as claimed in claim 1, is characterized in that, this second output state be this light emitting diode open short circuit value, voltage, electric current, colour temperature or brightness.
14. light-emitting diode (LED) module corrective systems as claimed in claim 1, is characterized in that, this light-emitting diode (LED) module more also comprises a driver element and a transmission unit.
15. light-emitting diode (LED) module corrective systems as claimed in claim 1, is characterized in that, this deck watch exports an external connection display apparatus to.
16. 1 kinds of bearing calibrations, are applied to the system of claim 1, it is characterized in that, comprise:
Make this correcting unit export this command signal to this control unit;
Make this control unit export this first input signal;
This signal conversion unit is changed this first input signal and is exported this second input signal;
Make this internal monitoring unit export this first output state;
Make this external monitoring unit export this second output state; And
Make this memory comparing unit compare and remember and produce this deck watch.
17. as the bearing calibration of claim 16, it is characterized in that, this deck watch comprises this second output state and this first output state.
18. as the bearing calibration of claim 17, it is characterized in that the actual driving current value that this second output state is this light emitting diode, and the working period values that this first output state is this light emitting diode.
19. as the bearing calibration of claim 16, it is characterized in that, this deck watch comprises this second input signal and this second output state.
20. as the bearing calibration of claim 19, it is characterized in that, the initial driving current value that this second input signal is this light emitting diode, and the actual driving current value that this second output state is this light emitting diode, wherein this initial driving current value is to should actual driving current value.
21. as the bearing calibration of claim 16, it is characterized in that, this deck watch comprises this command signal and this second input signal.
22. as the bearing calibration of claim 21, it is characterized in that, the initial output brightness ratio that this command signal is this light emitting diode, and the conversion output brightness ratio that this second input signal is this light emitting diode.
23. as the bearing calibration of claim 16, it is characterized in that, what this second output state comprised this light emitting diode opens short circuit value, voltage, electric current, colour temperature or brightness.
24. as the bearing calibration of claim 16, it is characterized in that, what this first output state comprised this light emitting diode opens short circuit value, voltage, electric current, work period, colour temperature or brightness.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW101143307 | 2012-11-20 | ||
| TW101143307A TWI501694B (en) | 2012-11-20 | 2012-11-20 | Light emitting diode module correct system and method thereof |
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| Publication Number | Publication Date |
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| CN103841721A true CN103841721A (en) | 2014-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310309973.9A Pending CN103841721A (en) | 2012-11-20 | 2013-07-23 | LED module correction system and correction method thereof |
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| TW (1) | TWI501694B (en) |
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| US8492987B2 (en) * | 2009-10-07 | 2013-07-23 | Lutron Electronics Co., Inc. | Load control device for a light-emitting diode light source |
| TWI555438B (en) * | 2009-12-16 | 2016-10-21 | 波音特索米有限責任公司 | Adaptive current regulation for solid state lighting |
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| TW200838358A (en) * | 2006-11-21 | 2008-09-16 | Exclara Inc | Time division modulation with average current regulation for independent control of arrays of light emitting diodes |
| CN101374380A (en) * | 2007-07-27 | 2009-02-25 | 财团法人工业技术研究院 | Light source device and drive device thereof |
| TW201023683A (en) * | 2008-12-02 | 2010-06-16 | Ememory Technology Inc | LED lighting control integrated circuit having embedded programmable nonvolatile memory |
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| CN102045912A (en) * | 2009-10-09 | 2011-05-04 | 连营科技股份有限公司 | Color modulating system and method |
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| Publication number | Publication date |
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| TWI501694B (en) | 2015-09-21 |
| TW201422048A (en) | 2014-06-01 |
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Application publication date: 20140604 |