TW201041445A - Driving circuit of light emitting diode - Google Patents

Abstract

A driving circuit of light emitting diode is provided in the present invention, which includes a double edge trigger data capturing transmission unit to sample a data input signal with double trigger manner. The present invention utilizes rising edge and falling edge of a clock signal to perform triggers to sample data so that twice data rate is obtained. Thereby, the frequency of the clock signal in the present application is reduced to half frequency of the clock signal in related art so that the stability of system is increased.

Description

201041445 30689twf.doc/n VI. Description of the Invention: [Technical Field] The present invention relates to a driving circuit for a light-emitting diode, and more particularly to a driving circuit having a double-edge triggering function. [Prior Art] Light Emitting Diode (LED) is small, power-saving and durable, and as the process matures, the price drops. Recently, products using light-emitting bodies as light sources are becoming more and more popular. In addition, 'light-emitting diodes have low operating voltage (only 1.5-3V), can actively emit light and have a certain brightness, and the brightness can be adjusted by voltage or current. At the same time, it has the characteristics of impact resistance, vibration resistance and long life (100,000 hours). Light-emitting diodes are widely used in a variety of terminal equipment, from automotive headlights, traffic lights, text displays, billboards and large-screen video displays, to general architectural lighting and LCD backlighting. In the conventional LED driving device, the data transmission is only accessed by using a single rising edge of the timing signal. The schematic diagram of the data sampling is shown in Figure i, and Figure 1 is a schematic diagram of data sampling according to the prior art. As shown in Figure i, the rising edge of the 'b-sequence k number CLK triggers the drive circuit to extract the data input signal DIN, and its sampling points (such as S1, S2) correspond to the rising edge of the timing signal cLK. However, as the application of the light-emitting diode has been widely used to display visual information such as patterns: images, in order to improve the change of the gray-scale driving of the light-emitting diode or increase the number of serial connections of the light-emitting diode driving device , so that the amount of data transmission per unit time of the transmitter=diode drive device is constantly increasing. 'Italian (4) The frequency of the order money must be continuously improved. The previous number of 201041445 30689twf.doc/n MHz level enhances the application of the ship in excess of 3GMHz. However, the operating frequency will increase the high frequency dry _ effect, resulting in = fixed, but also increase the difficulty of system design. The present invention provides a driving circuit for a light-emitting diode, which utilizes a method of extracting data to enter a signal, and uses a rising edge of the timing signal without adding an additional control signal. Touch with the falling edge to get twice the amount of feed. Under the same amount of data, the frequency of the timing signal of this is only half of that of the conventional LED driving method. The invention provides a driving circuit for a light emitting diode, comprising a double edge data transfer unit, a signal processing unit and a light emitting body driving unit. The dual-edge transmission receiving unit receives the timing signal input signal, and the double-edge trigger data transmission unit triggers the signal of the Qilong input by the timing rising edge and the falling edge, and records the ___ Lose money. The signal processing unit double-fetch data transmission unit is configured to store the data input signal captured by the double-edge data and input the C: drive enable signal according to the stored data. The LED driver unit is deactivated by the driving enable signal to rotate at least one gamma signal to drive the at least one LED. In the case of a month-to-month-perform, the above-mentioned double-edge data transfer unit packet and the edge trigger shift register. The pulse generates electricity and generates a pulse signal, wherein the pulse signal has a complex number 201041445 30689twf.doc/n first pulse and a plurality of second pulses 'the first pulse' corresponds to the rising edge of the timing ##, the pulse of the pulse The timing corresponds to the timing letter | the falling edge of the tiger. The single-edge trigger shift register samples data according to the pulse signal and sequentially stores the captured data input signal. In an embodiment of the invention, the dual-edge data acquisition unit includes a dual-edge trigger shift register, which is triggered by the rising edge and falling of the timing signal to sample the data input signal and sequentially Store the captured data input signal. In an embodiment of the invention, the driving circuit further includes a timing sounding unit for receiving the timing signal and outputting the in-phase or inversion phase. In an embodiment of the invention, the double-edge The data transfer unit includes a first double edge trigger shift register, a second double edge trigger shift register, a data input signal processing circuit, and a multiplexer. The first-double 4-touch, the shift register is used to store one image of the data input signal; the second double-edge trigger shift register is used to store the data input signal: the data; the data input The human signal processing power is connected to the f input signal for outputting the _ or the inverted data wheel human signal; the multiple H outputs = the end ^_ connected to the first-double edge trigger shift register, the second double The edge solution and the data input signal processing circuit are turned out, the multiplexed crying ^ is connected to a data output terminal 'and according to the selection signal; the multiplex = the invention - the implementation of the signal processing From the data-circuit sub-circuit and _ data operation circuit. The material storage circuit is used to store the double edge. 201041445 j〇689twf.d〇c/n Poverty: The resource captured by the transfer unit is used to turn the drive enable signal. t 4transelectric Ο ο and - second data storage circuit. The first data: the second asset: the storage data input signal - the image data, the material in the wheel _ In an embodiment of the invention, the data device and the plurality of (four) er stored data input letter " ' • In this embodiment of the present invention, the above-mentioned data is managed by the input of the data to the data object; and the tiger is the second and the output_ In the embodiment of the present invention, the driving circuit further includes: detecting the in' Μ detecting the state of the LED and the driving circuit and outputting the -: '1. to the data transfer unit In the present invention, in the embodiment, the LED driving unit further includes a light emitting diode driving circuit and a driving signal setting circuit. The body drive circuit is connected to the signal processing unit, and drives the money to the red light emitting diode according to the driving enable signal. The driving signal setting circuit is lightly connected to the light emitting diode driving circuit for adjusting the light emitting diode driving circuit. The output drive signal. 201041 445 30689twf.doc/n In the present invention-embodiment, the above-mentioned double edge acquisition packet edge register, a data input signal processing circuit: the data wheeled signal captured by the deposit; data input letter = = face-in: the number and output the data input signal in phase or inversion;;: the input end of the descent is transferred to the output of the double-edge trigger input signal processing circuit, the guest and the data output end. The end is coupled to the data electric conversion circuit and a silk circuit. The digital analog conversion is connected to the signal processing electric hard circuit and the number two i: the current conversion circuit _ reference drive unit output == change The circuit is used to adjust the light-emitting diode-, ίί invention-in the embodiment, the above-mentioned driving circuit further includes a control unit coupled to the double-edge data transmission unit for deriving the signal to the German, The double-edge acquisition data number and the data input signal generation control signal are delivered in advance. And the time-series signal illumination is used. The present invention utilizes the double-edge data acquisition unit to excavate both of the touches due to the rising edge of the phase number. The falling edge is the same as 'therefore Technical-half, and can be reduced (10) 201041445 306S9twf.doc/n 1ΞΪΓΓΕΜΙ) Adding purely tumbling, and simplifying the system _ In order to make the above features and advantages of the present invention more obvious and easy to understand, The drawings are described in detail below. Temple [Embodiment] First Embodiment

Referring to Figure 2, Figure 2 is a block diagram of a driving circuit in accordance with a first embodiment of the present invention. The driving circuit 200 includes a double-edge 撷ς ^ special unit training, a signal processing unit shift, and a light-emitting diode driving early 7L 230. The nickname processing is coupled between the dual-edge data transmission and the light-emitting diode driving unit 23〇, and is used for storing the data acquired by the double-picked material transfer unit 210 and performing data calculation functions. . The signal processing unit 22G includes a plurality of sets of multi-bit storage devices for data storage. The data storage circuit is, for example, a data check locker, and the number of bits is determined by design requirements, and the embodiment is not limited. The L processing unit 220 stores the data input signal DIN captured by the double edge data transfer unit and operates according to the stored data wheel signal DIN to output the drive enable signal to the LED driver unit. . The LED driving unit 230 will be based on the signal processing unit 22〇

The output drive enable signal generates a plurality of drive signals (e.g., κ, K is a positive integer) to drive the light emitting diode. The light emitting diode driving unit 23 can adjust the gray scale (brightness) of the light emitting diode by adjusting the driving voltage or current. The double edge extraction data transfer unit 210 receives the data input signal DIN and the 201041445 30689twf.doc/n timing signal CKI, and is sent by the rising edge of the timing signal CKI to the capitalist (four) round torn (four) and the city 3 2, this The data sampling timing of the first embodiment of the invention; L 4 takes the points S1 to S3 to indicate the time point at which the double-edge data transmission unit 21G extracts the DIN of the data entry number. Sampling point S1, ^

= rising edge, sampling point S2 corresponds to the timing signal edge. It can be seen from Fig. 2B that under the timing signal (5) of the same frequency, the unit 210 will increase by - times the circuit triggered by the single edge. If the amount of data to be read is the same, then the timing signal CK! = can be reduced to a half of the conventional timing signal, so that the double-edge data can be transmitted to the required data amount.

The internal circuit of the double-edge squeezing material transfer unit 21〇 can be directly realized by using the double-edge trigger shift (4), or can be realized by the __ generating circuit and the single edge=transmitting register. Please refer to FIG. 3A. FIG. 3A is an internal circuit diagram of a dual-edge data transmission unit according to the embodiment of the present invention. The double-edge data-carrying unit training includes a pulse generating electric 3 register (10). The pulse generating circuit 32 is coupled to the single edge buffer 310 for converting the received timing signal cki. The pulse generating circuit 320 generates a pulse signal according to the timing signal CKI, when the timing No. 2 CKI is converted from the low level to the still level (ie, the rising edge) or the high level is turned to the low level (ie, the falling edge) ), the pulse generating circuit 320 generates a pulse. Please refer to FIG. 3B, which is a pulse signal waveform according to the embodiment. 10 201041445 30689twf.doc/n

Ο Figure. As can be seen from FIG. 3B, the pulse signal PUS will generate a corresponding pulse corresponding to the rising edge and the falling edge of the timing signal cKI. The timing of the pulse ρι corresponds to the rising edge of the timing signal CKI, and the time 庠' of the pulse P2 corresponds to the falling edge of the timing signal. Among them, it is worth noting that the width of each pulse in the == PUS will be less than half the period of the timing signal CKI, avoiding the overlap of the waveforms of adjacent pulses. When the clock period in the timing signal CKI is smaller, the corresponding pulse width must also be smaller. Since the pulse generating circuit 320 can convert the timing signal CKI into a pulse signal PUS having two, the number of pulses, @this can be obtained by using a positive edge trigger or a negative edge trigger regardless of the single edge trigger shift register 31 The data, ^ can be obtained by the effect of the _ money PUS _ secret f touch amount i in this example f 'single edge touch (four) register 310 is using the positive edge trigger square two to extract, so in the pulse signal The action of the rising material sampling of each pulse in the PUS, the sampling time and the direct use of the double edge

: Sampling to achieve the dual-edge data transfer unit. 210 sampling time and the same sampling rate. T TM — Since a light-emitting diode display usually has a plurality of light-emitting diodes, if the two-way θ θ sheets are insufficient to drive all of the light-emitting diodes, a plurality of receptions are usually driven in series. At this time, after the driving wafers need to transmit the greedy wheeling signal din of the force 1 to drive the plurality of LED input signals Dm#, the money path is set to transfer the data to the driving circuit of the next stage. . Double-edge data transmission 201041445 30689twf.doc/n The signal outputted by the 21G in the morning vibrating wheel is called DO, and the data output letter, the heart (4) ten f ^ shell (four) out of fatigue} M h £ΙΧ The input circuit m for the or inverted data input circuit 200 can also output the in-phase or inverted timing signal CKI. Second embodiment

Please refer to FIG. 4 for the transmission of the "signal_". FIG. 4 is a driving circuit according to a second embodiment of the present invention. The driving circuit thoroughly draws the W« unit 4丨0, the secret element 42 (), and the light emitting diode. The driving unit, the timing processing unit paste, the detection protection unit side, and the control unit 460. The signal processing unit 42 includes a 421 and data operation circuit 422, and the LED driving unit 43 includes a LED driver. The circuit 432 and the drive signal setting circuit 47. The double edge data transfer unit 41 includes a double edge capture shift register circuit 413, a data input signal processing circuit 415 and a multiplexer 417. The multiplexer 417

The input ends are respectively coupled to the outputs of the dual-edge capture shift register circuit 413 and the data input signal processing circuit 415, and the output of the multiplexer 417 is consumed by the > material output terminal of the drive circuit 400 and according to the control unit The selection signal SEL rotated by 460 selects the output of one of the double-edge capture shift register circuit 413 and the data input signal processing circuit 415 to generate the data output signal DO. The data input signal processing circuit 415 can output the positive or negative phase data input signal DIN according to the setting. When the inverted data input signal DIN is output, the attenuation problem of the data input signal DIN during transmission can be effectively reduced. 12 201041445 30689twf.doc/n After the data input signal DIN is transmitted through the drive circuit of several stages, the pulse width of the data input signal DIN and its waveform are still maintained. The timing processing unit 440 is configured to transmit a timing signal CKI, and may output a timing signal cki of a positive phase or an inverted phase according to the setting to generate a timing output signal CK〇. Similarly, when the inverted timing signal CKI is output, the attenuation problem of the timing signal cki at the time of transmission can be effectively reduced. Let the timing signal CKI go through several levels

Ο Drive circuit transmission, health timing (4) CKI pulse width and its waveform. ', ', the variation of the process in the process..., the drive circuit has a difference between the rising edge time and the falling edge _ when transmitting the signal, because the transfer is reversed by the money and then the order is passed. 'There is a Problems such as signal attenuation or distortion caused by the difference in falling edge time. "In addition, in the circuit structure, the timing processing unit phase can directly consume the signal CKI and the clock output terminal, which is used to transmit the phase sequence signal CKI to the next stage of the drive-type data input signal. Din and time = number = level of the drive circuit or through the data output terminal == drive circuit __ wire value to the line to ^ shift register circuit 4 丨 3 can be temporarily stored by double edge, and Or by the early margin shift temporary storage crying disk. σ hall (as shown in Figure 3). Double 'CKI, material input signal Xinjiang data sampling and depend on; storage 13 201041445 30689twf.doc / n input signal DIN. Data storage circuit 421 is lightly connected between the data operation circuit 422 and the double edge capture shift register circuit 413, and is captured in the shift temporary storage circuit 413 according to the latch 彳s number LAT latched by the control unit 46〇. The temporarily stored data is then transferred to the data operation circuit 422 for calculation. The data operation circuit 422 outputs a drive enable signal to the LED body circuit 432 according to the extracted data input signal din to output a corresponding drive signal. , the data operation circuit 422 can be gated The digital comparator is composed of a digital comparator, but the present invention is not limited thereto. In the embodiment, the LED driving circuit outputs K driving signals, and κ is a positive integer. The light emitting body driving unit 43 is mainly composed of two light emitting diodes. The driving circuit setting circuit 470 is coupled to the driving diode setting circuit 432. The driving signal setting circuit 470 is coupled to the LED driving circuit 432. The driving signal setting voltage=47〇 is mainly used to set the LED driving. The driving power of the circuit 432 = the value of the % voltage or the effective enabling time (duty cyCie). The driving signal setting circuit 470 can also adjust the required parameters according to the data wheel number DIN received by the driving circuit 4 以 to adjust The driving signal set by the LED driving circuit 432. The driving signal setting circuit 470 can directly receive the required command data via the data receiving unit or receive the different working mode adjustment signal MODE via the control unit 460. The unit 460 is coupled to the dual edge data transfer unit 410, the resource storage circuit 421, and the detection protection unit 450. The control unit 460 can input the signal DIN and the timing signal CK. I waveform combination or transmission, data data rotation yoke signal LAT, operation mode signal MODE and 14 201041445 30689twf.doc/n selection signal SEL and other control signals or parameter setting signals. In addition, when the data input signal DIN and timing signals When the CKI is the encoded data, the control unit 460 can also be used to decode the data input signal DIN and the timing signal CKI. Then, the decoded data input signal DIN and the timing signal CKI are transmitted to the double edge data transmission. Unit 410. The field % drive circuit 400 can have multiple drive modes or multiple adjustments.

The entire parameter value. The control unit 460 can determine its parameter value directly via the data input signal DIN and the #序彳σ number CKI. In other words, the data input signal DIN includes image data and command data 'image data is used to determine the gray scale value of the light-emitting diode' and the command data is used to set the f value in the drive circuit 4'. The control unit 46 can detect different circuit parameters and environmental state values according to the command in the data input signal DIN (4), the operation mode of the 妓 妓 M 〇 _ _ _ _ _ _ _ _ _ _ _ The feed protection unit 45 can be in accordance with the (four) state of the operating mode signal m〇de, such as temperature, voltage, current, whether the circuit is in a state of two or the state of the light emitting diode, such as an open circuit, a short circuit, a degree of oxidation, and the like. Detection protection unit · can be added - general circuit adjustment 2 =, and _ function for circuit status monitoring and immediate biliary attention, detection protection unit 45 = set parameters for circuit price measurement circuit... The protection of the protection unit, etc. 'simultaneous detection protection unit 450 can be through the second protection or over ί ί ί: 广 接 接 输 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来 接下来Doc/n drive circuit. Please refer to the drive circuit diagram of the map. The driving circuit is ubiquitously: the third real memory 510, the 8-bit data storage circuit 521, the edge-moving shifting nozzle 522, the light-emitting diode driving single-bit data-transporting circuit 530 including the light-emitting diode drive The light-emitting diode driving unit 570 in the j. The 8-bit data operation and driving signal setting circuit 53 and the 8-bit data are stored in the other side bit data storage circuit of the LED driving unit.

It should be noted that the light-emitting diode drives Wei 432=m^510. The value of the diode drive circuit is to rotate 8 drives (four). ° 8 light-emitting 8-bit data storage circuit U / data subtraction / stomach according to the latch signal LAT to perform the Bellows lock to store the 8-bit double edge capture shift: , the data operation circuit 522 from multiple hearts :== ===N and the storage circuit 521 is rotated = stored; I·:% 522 according to the 8-bit data storage circuit 521 的 2 tribute and enable signal ΕΝ respectively determine the LED driving circuit 2 Whether to transfer the drive signal. In this implementation, although the 8-bit is used as an example to illustrate the 8-bit dual-edge capture shift register 51() and the 8-bit material storage circuit 5, the above circuit structure is not limited to 8-bit. It is also possible to adapt the circuit structure of higher or lower bits. The value means that the lock letter, the LAT and the enable signal EN can be output by the control unit, and the present embodiment is not limited. Regarding the operation mode of the remaining component disk of the driving circuit 5A, reference is made to the above description of the embodiment of FIG. 4, and the following description is repeated. Fourth Embodiment 16 201041445 3〇689twf.doc/n Since the = lean input signal can be included A variety of materials 'including image data and command data for setting the working mode, so the taper edge of the above-mentioned circuit can also be set to two storage circuits corresponding to the lean material transfer unit and the signal processing unit. Please refer to Fig. 6, s 6 is a driving circuit® according to a fourth embodiment of the present invention. Drive circuit _ including double edge data transfer

Ο Data storage circuit 621, data operation circuit 622, light-emitting diode = early 630, timing processing unit _, detection protection unit 65 〇, control early 660, and power management system 68 〇. The data acquisition unit _ includes a dual edge trigger shift temporary sector = 3, 614 H 617 and a data input signal processing circuit 615. The three input ends of the yoke 617 are tapped on the double-edge trigger shift temporary crying, and the input signal processing circuit 615 is controlled by the control end of the fJ 兀 660 夕 夕 斋 617 output is coupled At the data output end of the drive circuit 6 (8), a signal D is outputted as an output data. The data input signal processing circuit 615 can transmit the data input signal in phase or inversion to the data output terminal of the driving circuit 6 through the multiplexer 617. The control unit 660 outputs the timing signals '', cki2, and the data wheel human signal DIN i double-edge trigger shift register/13, 614, respectively, based on the timing signal CKI. The dual-edge trigger shift register 613, 614 will extract the data input signal according to the sequence number ^α!, cKi2 and sequentially transmit the extracted data. The control unit _ will also output the data input signal to The data input processing circuit 615, the data input processing circuit 615 can rotate the data in/out phase or inversion signal DIN. The control unit 66 uses the selection signal S E L City Multi-Guard 6丨7 to selectively switch the output signal DO to be output. The double and 2 (four) registers 613 and 614 are all temporary storages belonging to the double-edge trigger, and can be triggered by the timing signal CKli, the rising edge and the lower edge of the signal. In the present embodiment, the dual-edge trigger shift register 613 is, for example, a 12-bit dual-edge trigger shift register, and the register 614 is, for example, a 7-bit dual-edge trigger shift temporary. The consultation is a positive integer indicating the number of drive signals. The value is that the timing signals CKI1, CK12 can be generated by the control unit 66, the sequence signal CKI. It is known that the processing unit _ and the above-mentioned real-time processing are mainly used to transmit the timing signal CKI to generate the timing output signal CK〇. With the joint venture out U Tiger DO and Βτ sequence output signal CK 〇, the drive circuit can delete the state value of the = part or the driver circuit of the relay signal (four) sequence signal cki transmission stage. The operation mode of the sequence processing unit ^ _ is the same as that of the previous embodiment, and will not be described here. 〇 The data storage circuit (2) and the data operation circuit 622 constitute a signal, which is between the data transmission unit 61G and the light-emitting diode = unit 630. The data storage circuit 621 further includes a first "memory circuit 623 and a second data storage device. The first data storage device Δ^23 and the second data storage circuit 624 can be triggered by the double-edge according to the latch signals LAT1 and LAI, respectively. The shift register 6 ΐ 3, 614 reads = material ^ such as image data or command data). The first - f material storage circuit (2) travel M 12-bit data storage circuit to correspond to the storage of double-edge touch Save the data picked up by Is 6! 3. The second data storage circuit · 18 201041445 30689twf.doc / n Smart poor storage circuit to correspond to the storage of double edge trigger shift „ 6Η captured data. It is worth noting that the latch signal, LAT2, can be generated by the control unit, but is not limited to being generated by the control, but also by the outside (front-end circuit or system). The tributary operation circuit 622 includes a counter yang and a plurality of comparators, such as a digital comparator, and the comparator ～43z is used to compare ^ Ο

The data of the lock detected in the milk of the first data storage circuit, j = whether the light-emitting diode driving unit 630 outputs one drive =. The poor material operation circuit M2 uses the counter coffee and a plurality of comparators to perform the operation of the fine image (4), and its function can be regarded as: pulse width and I: unit (pUlse width m〇dulati〇n fat (1), used to adjust the light The second 3 drives the pulse width adjustment signal received by the single S63G. At the same time, the dimming diode driving unit 63 输出 outputs the driving signal of the power month b 0 driving signal slave circuit 67 〇 including the digital analog conversion circuit milk, j voltage enchant circuit 674 sighs the money circuit π6. The reference μ-sheng circuit 674 is coupled to the voltage-current conversion circuit 676, the digital class, the circuit 672 is consumed between the data error circuit a4 and the voltage-current conversion snow 676. Digital analogy The conversion circuit π2 converts the command material stored in the data storage 5 band, 24, into an analog signal (for example, voltage) to output the current conversion circuit 676. The shirt current conversion circuit 676 is based on the second material and the meal test circuit 674. The output adjusts the driving signal of the LED driving pen path 632. In addition, the value of the above-mentioned double-edge data transmission unit 19 201041445 30689twf.doc/n 610, the data storage circuit 621 and The components in the material computing circuit can be designed as electronic components of different bits according to the requirements of use, and the transmission path and the data transmission mode are also adjusted according to the required number of data bits. The present invention is not limited to the above. The number of bits described in the embodiment. In addition, the face of the data input DIN can be a general money or a differential signal, and the embodiment is not limited. The power management system 680 is mainly used to manage the driving circuit 6〇. The power supply of the crucible is, for example, a modulated power management system or a linear power management system (Unearpowermanager). The control unit 660 can obtain the security mode data according to the combination of the received data input signal mN and the timing signal CKI, and output the working mode signal MODE to the debt testing protection unit 65〇 to perform the switching or parameter setting of the working mode. Or circuit state system. The side unit (4) can bribe the detected parameter value to the data transfer unit (10), and the data output signal DO output. Please, in addition, it is worth noting that the clock output signal (: 艮〇

According to the parameter setting, the output phase in-phase timing signal CKI 'Bei; the bucket wheel enters the k-number DIN or the round-trip inversion timing letter KI 2 = outside 'if the data input signal _ and the data output letter' enters the codec, The output of the decoding circuit 600 can also be added to the control unit 660. The encoder can be added to encode the data. The remaining circuit operation details of the driving circuit are as described in the second embodiment. Not being told. Next, please refer to FIG. 7 and FIG. 7 as a fourth embodiment according to the present invention. 20 201041445 30689twf.doc/n

资料 Data output signal waveform diagram. Taking 12-bit image data and 8 driving signals (the LED driving circuit 630 can output 8 driving signals) as an example, when the driving circuit 600 sequentially outputs the double-edge capture shift register circuit 613 When the data is retrieved, the data output signal DO is delayed by 96 bits from the data input signal DIN. Since the dual-edge capture shift register circuit 613 performs data sampling in the manner of double-edge triggering, the double-edge stripping shift register circuit 613 only needs 48 cycles of the timing signal CKI to complete 96 bits. Sampling of data. In summary, the LED driving circuit of the present invention has a dual-edge triggering circuit, so that data access can be performed with a lower frequency timing signal, thereby reducing the high frequency signal pair. Electromagnetic interference of the drive circuit and increase the stability of the drive circuit. The present invention has been disclosed in the above embodiments, but it is not intended to limit the present invention. Any person having ordinary knowledge in the art can make some modifications and retouching without departing from the spirit and scope of the present invention. After looking at the social towel, please take a full-time office. [Simple description of the map] Figure 1 shows the sampling of the data according to the conventional technology. Circuit = is the driving of the photodiode according to the first embodiment of the present invention. Fig. 2B is a schematic diagram showing the sampling timing of the data according to the first embodiment of the present invention. Fig. 3A is an internal circuit diagram of the first unit according to the present invention. Double Edge Data Transfer of Embodiments 201041445 30689twf.doc/n FIG. 3B is a waveform diagram of a pulse signal according to the present embodiment. 4 is a driving circuit in accordance with a second embodiment of the present invention. Figure 5 is a diagram showing a driving circuit in accordance with a third embodiment of the present invention. Figure 6 is a diagram showing a driving circuit in accordance with a fourth embodiment of the present invention. Figure 7 is a waveform diagram of a data output signal in accordance with a fourth embodiment of the present invention. [Main component symbol description] 200, 400, 500, 600: drive circuit 210, 410, 610: double edge data transfer unit 220, 420: signal processing unit 230, 430, 530, 630: light emitting diode drive unit 440, 640: timing processing unit 310: single-edge trigger shift register 320: pulse generation circuit 413: double edge capture shift temporary storage circuit 415, 615: data input signal processing circuit 417, 617: multiplexer 421 621: data storage circuits 422, 622: data operation circuits 432, 532, 632: light-emitting diode drive circuits 450, 650: detection protection units 460, 660: control units 470, 570, 670: drive signal setting circuit 510 : 8-bit dual-edge capture shift register 22 201041445 30689twf.doc/n 521 : 8-bit data storage circuit 522: 8-bit data operation circuit 613, 614: double-edge trigger shift register 623: First data storage circuit 624: second data storage circuit 672: digital analog conversion circuit 674: reference voltage generation circuit 676: voltage current conversion circuit 680: power management system CLK, CKI, CKL, CKI2: timing signal CKO: timing output signal DIN: capital Material input signal DO: data output signal EN: enable signal LAT, LATi, LAT2: latch signal MODE: operation mode signal PUS: pulse signal PI, P2: pulse S1~S3: sampling point SEL: selection signal 43b~43z: Comparator 43a: counter 23

Claims (1)

201041445 30689twf.doc/n VII. Application for Patent Park: L—The driving circuit of a light-emitting diode' includes: a dual-edge data transfer unit that receives a timing signal and a data input signal. The data transfer unit is triggered by the rising edge and the falling edge of the timing signal to sample the data input signal and sequentially store the consumed input signal, and a signal processing unit coupled to the double edge The data transfer unit is configured to store the data input signal captured by the dual-edge data transfer unit and output a drive enable signal according to the stored data input signal; and a light-emitting diode driving unit, The signal processing unit is coupled to the signal processing unit and outputs at least one driving signal to drive at least one of the light emitting diodes according to the driving enable signal. 2. The driving circuit of claim 1, wherein the dual-edge data transfer unit comprises: a pulse generating circuit, generating a pulse signal according to the timing signal, wherein the pulse signal has a plurality of first pulses And a plurality of second pulses, the timings of the first pulses correspond to rising edges of the timing signals, the timings of the second pulses correspond to falling edges of the timing signals; and a single-edge trigger shift register, The data input signal is sampled according to the pulse signal, and the captured data input signal is sequentially stored. 3. The driving circuit according to claim 1, wherein the double edge data transfer unit comprises: 24 201041445 30689twf, doc/n a double edge trigger shift register, by the rising edge of the timing signal Triggering with the falling edge to sample the data input signal and sequentially store the captured data input signal. 4. The driving circuit of claim 1, wherein the double edge data transfer unit comprises: a double edge trigger shift register is triggered by the rising edge and the falling edge of the timing signal to perform data sampling on the data input signal and sequentially store the captured data input signal; — data input signal processing circuit Receiving the data input signal and outputting the data input signal in the same phase or inversion; and - multi-working, a first input end of the multiplexer is coupled to the output of the double-edge touch device A second input end of the multiplexer is coupled to the output of the data wheel signal processing circuit, and an output end of the multiplexer is coupled to the data output end. 5. The driving circuit of claim 1, wherein the daily processing unit receives the timing signal and outputs the timing signal in phase or inversion. 6. The data transfer unit of the driving edge of the data according to item 1 of the Shenjing patent scope includes: - a first-double edge trigger shift register for storing one image data in the data input signal; a medium shift register for storing the data input and output human domain processing circuit, receiving the slot signal and outputting the data input signal in phase or inversion; and 25 201041445 30689twf.doc/n ^ ^ ^ The three wheel-in ends of the ππ kicking device are respectively coupled to the 哕# trigger shift register, and the second double-edge trigger shifts the b 枓 output, and the sub-decision determines the wheel of the multiplexer according to a selection signal. Out. 7' The driving circuit described in the scope of claim 2, the Star: No. 2 processing unit comprises: a tributary storage circuit for storing the data wheel signal obtained by the double edge collection; and (4) A data operation circuit is used to output the drive enable signal. 8. The driving circuit of claim 7, wherein the material storage circuit comprises: a first data storage circuit, the image data in the input signal according to a first latch signal, and the X-ray a second data storage circuit stores the command data in the secondary wheeling signal according to the /second latch signal. 9. The driving circuit as described in claim 7 of the patent application scope, the multiplexing operation circuit includes: a counter, a counter, and a plurality of comparators coupled to the counter and the data storage circuit for Comparing the stored data input signal with the rounding of the counter to generate the driving enable signal to the light emitting diode driving unit. 10. The driving circuit of claim 7, wherein the complex data operation circuit comprises: a plurality of gates, wherein the inputs of the gates are respectively coupled to the data storage. The circuit and the uniform signal, the outputs of the gates are coupled to the light-emitting diode 26 201041445 30689twf.doc/n body drive unit. 11. The driving circuit of claim 1, further comprising: a detecting and protecting unit for detecting a state of the light emitting diode and the driving circuit and outputting a detecting signal to the data transfer unit . 12. The driving circuit of claim 1, wherein the LED driving unit further comprises: a light emitting diode driving circuit coupled to the signal processing unit, and outputting the signal according to the driving enable signal The driving signals are used to drive the LEDs; and a driving signal setting circuit is coupled to the LED driving circuit for adjusting the driving signals output by the LED driving circuit. 13. The driving circuit of claim 12, wherein the driving signal setting circuit comprises: a reference voltage generating circuit; a digital analog conversion circuit coupled to the signal processing unit to receive the data input signal And a voltage-current conversion circuit coupled to the reference voltage generating circuit and the digital analog conversion circuit for adjusting the driving signals output by the LED driving unit. 14. The driving circuit of claim 1, further comprising: a control unit coupled to the dual edge data transfer unit for transmitting the timing signal and the data input signal to the double edge The data transfer unit is taken and a combination of the timing signal and the data input signal is used to generate a control signal. 27