CN105873290A - LED drive chip and LED drive circuit - Google Patents
LED drive chip and LED drive circuit Download PDFInfo
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- CN105873290A CN105873290A CN201610379081.XA CN201610379081A CN105873290A CN 105873290 A CN105873290 A CN 105873290A CN 201610379081 A CN201610379081 A CN 201610379081A CN 105873290 A CN105873290 A CN 105873290A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention discloses an LED drive chip and an LED drive circuit. The drive chip comprises a port detection module, an internal control coding and decoding module and a PWM display module. By means of the internal control coding and decoding module, when no data is input at the input end, display data needed by a same level LED drive chip is extracted from internally stored display data, and a synchronous code is output to the next level LED drive chip; when the synchronous code is input at the input end, display data needed by the same level LED drive chip is extracted from the internally stored display data according to a corresponding relation of a preset synchronous code and the internally stored display data, and the synchronous code is output to the next level LED drive chip; the PWM display module controls LED lamp display according to the display data. Therefore, even if false welding occurs for the drive chip, the subsequent drive chips can still control an LED lamp to display content needing to be displayed respectively according to the corresponding relation of the synchronous code and the display data, synchronous display is achieved, and the whole display system can perform displaying continuously.
Description
Technical field
The present invention relates to LED and control technical field, particularly relate to a kind of LED drive chip and LED drive circuit.
Background technology
At present, in prior art, the LED drive chip of series connection display system is connected in series step by step, and external control data (comprising display data) are transmitted between LED drive chip at different levels step by step.When wherein there being one or more LED drive chip rosin joint occur, opening short circuit, during the state such as floating, external control data will be caused cannot to transmit to rear stage LED drive chip, the uncontrollable LED of follow-up LED drive chip shows.To this, existing LED drive chip has two class actuation techniques to solve the problems referred to above, as follows:
A class is that LED drive chip normally shows under the control of normal external control data, when data input pin is abnormal short-circuit, during open circuit, i.e. when LED drive chip does not receives external control data, then show simple RGB style.Although this kind of technology can ensure that follow-up LED drive chip can control respective LED and continue display, but owing to the LED drive chip of series connection is a lot, the style (effect that display pattern is continuously varied to form) that each LED shows can not synchronize, it is impossible to meets the demand that LED shows.
B class is when LED drive chip input is abnormal short-circuit, during open circuit, i.e. when LED drive chip does not receives external control data, sends long string display data backward, and subsequent drive chip captures its corresponding data segment after obtaining these data and shows.Concrete, use the LED drive chip of B class scheme, when being not received by Frame, generate display data according to built-in effect algorithm, from the display data of described generation, obtain this grade of display data；It is sent to next driving chip after the display data of described generation or the remaining data shaping after extracting this grade of display data.It can thus be appreciated that, B class scheme is when external control data cannot be transmitted backward, display data are generated by self built-in effect algorithm, continue to transmit backward by display data, solve the display problem of follow-up LED drive chip, but, owing to the LED drive chip of series connection is the most, the bit number of display data is the longest, long display data will cause loss of data, chaotic, cause follow-up LED to show asynchronous even cannot show, in other words, the LED drive chip of B class scheme cannot spreading tandem join, i.e., the number of the LED drive chip that B class scheme can be connected is limited.
Therefore, how to solve fault driving chip each chip below can not the problem of simultaneous display, become the problem that this area needs to solve, prior art has yet to be improved and developed.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of LED drive chip and LED drive circuit, when aiming to solve the problem that for certain the LED drive chip fault existed in prior art in series connection display system, the LED causing subsequent drive chip to connect can not carry out showing, cannot the problem of simultaneous display.
Technical scheme is as follows:
A kind of LED drive chip, described LED drive chip is associated between upper level LED drive chip and next stage LED drive chip, and described LED drive chip includes:
Port detecting module, for detecting the data of the input input of this grade of LED drive chip；
Internal control coding/decoding module, is used for when the input of this grade of LED drive chip does not has data to input, the display data needed for this grade of LED drive chip of display extracting data of storage inside, and exports synchronous code to next stage LED drive chip；When the input of this grade of LED drive chip inputs synchronous code, corresponding relation according to the synchronous code pre-set Yu the display data of storage inside, display data needed for this grade of LED drive chip of display extracting data of storage inside, and export synchronous code to next stage LED drive chip；
PWM display module, for according to described display data, controls LED lamp and shows.
In described LED drive chip, described synchronous code does not comprise display data；The synchronous code that this grade of LED drive chip exports to next stage LED drive chip is corresponding with the display data needed for next stage LED drive chip.
In described LED drive chip, described LED drive chip also includes external control module, for when the input of this grade of LED drive chip inputs external control data, extract the display data needed for this grade of LED drive chip, and described external control data or the residue external control data after being extracted display data are exported to next stage LED drive chip.
In described LED drive chip, described LED drive chip also includes correcting forwarding module, the data exported for the data exported by internal control coding/decoding module and/or external control module carry out frequency and duty cycle correction, the data after correction are exported to next stage LED drive chip by the output of LED drive chip.
In described LED drive chip, the bit number of described synchronous code is less than or equal to the bit number of the display data needed for this grade of LED drive chip.
In described LED drive chip, the synchronous code of described internal control coding/decoding module output includes luminance control data, currently displaying frame number, the address of LED drive chip, display precision, style mark, display refreshing frequency, one or more in the configuration data regulating the parameter of LED drive chip.
In described LED drive chip, whether described port detecting module has data to input, when there being data to input specifically for the input judging this grade of LED drive chip, it is judged that data are external control data or synchronous code.
In described LED drive chip, described LED drive chip also includes frequency control module, for according to the frequency control signal received, controlling the frequency that synchronous code sends.
A kind of LED drive circuit, including controller, described controller is used for exporting external control data, and described LED drive circuit also includes n LED drive chip as above, n LED drive chip multi-stage LED in series drives, and the input of first order LED drive chip connects the output of controller.
Beneficial effect: providing a kind of LED drive chip and LED drive circuit in the present invention, wherein, described LED drive chip includes port detecting module, internal control coding/decoding module and PWM display module.The present invention passes through internal control coding/decoding module, when the input this grade of LED drive chip does not has data to input, the display data needed for this grade of LED drive chip of display extracting data of storage inside, and exports synchronous code to next stage LED drive chip；When the input of this grade of LED drive chip inputs synchronous code, corresponding relation according to the synchronous code pre-set Yu the display data of storage inside, display data needed for this grade of LED drive chip of display extracting data of storage inside, and export synchronous code to next stage LED drive chip；And then by PWM display module, control LED lamp according to display data and show.It can thus be appreciated that, even if rosin joint or circuit be not smooth to have LED drive chip to occur, follow-up driving chip still can control, according to the corresponding relation of synchronous code with display data, the content that LED shows that each needs show, achieve simultaneous display so that whole display system can continue display.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of LED drive circuit of the present invention.
Fig. 2 is the structured flowchart of LED drive chip of the present invention.
Fig. 3 is in LED drive circuit of the present invention, and each LED drive chip reads the schematic diagram of synchronous code.
Fig. 4 is in an embodiment of LED drive circuit of the present invention, and each LED drive chip reads the schematic diagram of external control data.
Fig. 5 is in another embodiment of LED drive circuit of the present invention, and each LED drive chip reads the schematic diagram of external control data.
Detailed description of the invention
The present invention provides a kind of LED drive chip and LED drive circuit, and for making the purpose of the present invention, technical scheme and effect clearer, clear and definite, the present invention is described in more detail below.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Refer to the structured flowchart of the LED drive circuit that Fig. 1, Fig. 1 provide for the present invention.As it is shown in figure 1, described LED drive circuit includes controller 10 and n LED drive chip 20, wherein, n is the positive integer more than 1.N LED drive chip 20 multi-stage LED in series drives, and the input of first order LED drive chip 1 connects the output of controller 10.
Described controller 10, is used for exporting external control data, and described external control data include the display data needed for each LED drive chip of series connection.
Described LED drive chip 20, for detecting the data of input input, when input does not has data to input, from the display data that the display extracting data of storage inside self is required, according to described display data, control LED lamp and show, and export synchronous code to next stage LED drive chip；When input input synchronous code, corresponding relation according to the synchronous code pre-set Yu the display data of storage inside, from the display data that the display extracting data of storage inside self is required, according to described display data, control LED lamp to show, and this synchronous code is modified, by synchronous code with self needed for show the corresponding relation of data to be revised as needed for next stage LED drive chip to show the corresponding relation of data, and then the synchronous code after next stage LED drive chip output modifications.nullConcrete，In LED drive chip 20, storage has the display data of whole LED drive circuit，According to the position relationship of series connection between each LED drive chip，Beforehand through synchronous code by corresponding for the display data needed for the address of LED drive chip and this LED drive chip，LED drive circuit is made to have indivedual or multiple LED drive chip to be in rosin joint，Open short circuit，During the states such as floating，Follow-up LED drive chip can also pass through the display data needed for the synchronous code acquisition transmitted step by step，Complete the display to LED to control，And，Synchronous code is different from display data，Can arrange the shortest，Do not shown by bit number，Therefore，LED drive circuit can connect infinite multiple LED drive chip in theory，Do not have loss of data、The situations such as confusion，And simultaneous display can be realized，The B class scheme of relatively prior art has the most progressive.
Further, refer to Fig. 2, the described LED drive chip that the present invention provides is connected between upper level LED drive chip and next stage LED drive chip, i.e., it is connected in series with multiple LED drive chip, and it includes port detecting module 210, external control module 220, internal control coding/decoding module 230, PWM display module 240 and correction forwarding module 250.
Described port detecting module 210, is used for detecting the data of the input input of this grade of LED drive chip (that is, the LED drive chip at self place), detects data, not only includes the type detecting data, also includes detecting the presence of data.Concrete, described port detecting module 210 is for judging whether the input of this grade of LED drive chip has data to input in the given time, when having data to input in the given time, it is judged that data are external control data or synchronous code, and will determine that result exports to internal control coding/decoding module 230.In other words, receive data in the scheduled time, then explanation input has data to input；Be not received by data in the scheduled time, then explanation input does not has data to input.
Described internal control coding/decoding module 230, for when the input of this grade of LED drive chip does not has data to input (as LED drive chip input end in rosin joint, open the state such as short circuit, floating time), display data needed for this grade of LED drive chip of display extracting data of storage inside, and export synchronous code to next stage LED drive chip；When the input of this grade of LED drive chip inputs synchronous code, corresponding relation according to the synchronous code pre-set Yu the display data of storage inside, display data needed for this grade of LED drive chip of display extracting data of storage inside, and export synchronous code to next stage LED drive chip.
Described PWM display module 240, for according to described display data, the LED controlling to electrically connect with this grade of LED drive chip shows.
The input of described port detecting module 210 connects output or the output of controller 10 of upper level LED drive chip, first output of described port detecting module 210 connects the input of internal control coding/decoding module 230, and the first output of described internal control coding/decoding module 230 connects PWM display module 240.
Further, described synchronous code does not comprise display data.It is higher to there is the bit error rate in longer data, in existing B class scheme, first order driving chip is as crossed error code 101 field, so subordinate's driving chip will not be modified, think that data correctly and are backward transmitted, owing to data are longer, the bit error rate will improve, and the data that driving chip below receives will be the sum data of prime all chips error code.And the synchronous code of the present invention does not comprise display data, use short data correction step by step, it is to avoid the error condition that B class scheme occurs.That is, the number not comprising the LED drive chip that display data mean that LED drive circuit connect is unrestricted, when long series connection shows, there is not the problems such as the error code accumulation that occurs in prior art B class scheme.
In the present invention, the synchronous code that this grade of LED drive chip exports to next stage LED drive chip is corresponding with the display data needed for next stage LED drive chip.Self required display data just can be obtained, it is achieved the simultaneous display of whole circuit after so next stage LED drive chip receives synchronous code.Certainly, described synchronous code can comprise and show that the corresponding relation of content, follow-up LED drive chip directly transmit this synchronous code needed for follow-up all LED drive chip, but, so arrange and make the bit number of synchronous code longer.Therefore, in this preferred embodiment, the synchronous code that this grade of LED drive chip exports to next stage LED drive chip is only corresponding with the display data needed for next stage LED drive chip, in other words, the synchronous code of this grade of LED drive chip output only comprise with next stage LED drive chip needed for the corresponding relation of display data, no matter LED drive circuit has concatenated how many driving chip, synchronous code is all only corresponding with display data, its bit number can be the least (i.e., frame length is the shortest), and the B class scheme of prior art does not possess this characteristic, the present invention is so arranged, data delay can be reduced to greatest extent, compared with existing B class scheme, greatly improve the precision that each LED drive chip synchronizes.
Further, the synchronous code of described internal control coding/decoding module 230 output includes luminance control data, currently displaying frame number, the address of LED drive chip, display precision, style mark, display refreshing frequency, one or more in the configuration data regulating the parameter of LED drive chip.Described luminance control data is for configuring the brightness of the LED lamp bead that next stage LED drive chip drives.Described currently displaying frame number, represents the frame number that this grade of LED drive chip current picture is corresponding, in order to next stage LED drive chip simultaneous display.The address of described LED drive chip, i.e. needs the address of the LED drive chip controlled.Described display precision, i.e. the display bit number of next stage LED drive chip, usually 8-16bit.Described style mark is corresponding with style, and next stage LED drive chip identifies according to described style, transfers the display data of corresponding style, the style that display is corresponding, and thus, each LED drive chip can control LED display according to this synchronous code and realize simultaneous display.Described display refreshing frequency, for controlling the display refreshing frequency of next stage LED drive chip.
Described controller, including fault detection unit.Described fault detection unit is used for output calibration code, and described correcting code is a kind of special synchronous code, i.e. the bit number of described correcting code is identical with described synchronous code.Described correcting code is corresponding with predetermined fault style, i.e. described correcting code display data corresponding with predetermined fault style are corresponding.After fault detection unit exports described correcting code, each LED drive chip is by fault style predetermined for display, then the driving chip of this style non-is exactly failure chip；So can find out the position of the LED drive chip broken down, it is not necessary to manual detection, greatly improve maintenance efficiency.Owing to LED drive chip is connected in series, the address of each chip and the type of style have continuity (being primarily referred to as the continuity of set step-length), after internal control coding/decoding module 230 extracts display data according to synchronous code, only synchronous code need to be carried out transcoding, can the synchronous code after transcoding be exported to next stage LED drive chip, without regenerating, save operation time.
Described style mark includes the frame information of this style.Described frame information is for indicating frame (picture) corresponding in a style, i.e., the frame that overall systemic circulation is corresponding, LED drive chip shows the corresponding frame of corresponding style according to frame information, and thus, the precision of simultaneous display has reached the rank of a frame, in other words, adding frame information in synchronous code so that each frame of style that whole LED drive circuit can make each LED drive chip control all synchronizes, each LED drive chip reads the principle of synchronous code as shown in Figure 3.As can be seen here, the setting of synchronous code, can limited gulp down code in the range of realize more kinds of style and show, and have the addition of address to make to show that length is extremely easily controlled.
Further, described LED drive chip also includes frequency control module (not shown), for receiving the frequency control signal of outside output, according to the frequency control signal received, controls the frequency that synchronous code sends.The frequency that synchronous code sends, sends several groups of synchronous codes in referring to 1 second.Described frequency control signal is periodically pulsing signal, concrete, can be AC signal (AC signal).Described frequency control signal can be sent by controller, it is also possible to is directly connected to AC power.Concrete, described frequency control module extracts the frequency of frequency control signal, regulates, by the prearranged multiple of the frequency of frequency control signal, the frequency that synchronous code sends.Described prearranged multiple can set according to actual conditions, for positive number, such as 1,0.5,2 ... etc..The setting of frequency control module, in that context it may be convenient to control the display frequency of the display screen that follow-up LED drive chip controls.
In the present embodiment, the input rate of connections control signal of described frequency control module provides end, and the output of described frequency control module connects internal control coding/decoding module.In other words, in the circuit that n LED drive chip multi-stage LED in series of the present invention drives, all of LED drive chip equal parallel join control signal provides end, if not using controller, that is, all LED drive chip all can not receive external control data, and the most all of LED drive chip shows all in accordance with synchronous code, therefore, all of LED drive chip simultaneous display can be made by frequency control module.
Please continue to refer to Fig. 2, described external control module 220, for when the input of this grade of LED drive chip inputs external control data, extract the display data needed for this grade of LED drive chip, and described external control data or the residue external control data after being extracted display data are exported to next stage LED drive chip.In the present invention, the data transmission of LED drive chip can use and gulp down code transmission, it would however also be possible to employ the non-code that gulps down transmits.In the present embodiment, for reducing bit number, the quantity of raising series chip, employing gulps down code transmission, i.e., after external control module 220 receives external control data, extracting the display data needed for this grade of LED drive chip, and will be extracted the residue external control data after display data and export to next stage LED drive chip, LED drive chip reads the schematic diagram of display data as shown in Figure 4.Second output of described port detecting module 210 connects the input of external control module 220, and the first output of described external control module 220 connects PWM display module.
Further, the bit number of described synchronous code is less than or equal to the bit number of the display data needed for this grade of LED drive chip, and in other words, the bit number of the display data that LED drive chip gulps down is more than or equal to the bit number of described synchronous code.When the bit number of the display data that LED is gulped down is identical with the bit number of synchronous code, needing to be identified, otherwise chip is easily obscured, and causes normally showing.Therefore, in the present embodiment, the bit number of described synchronous code is less than the bit number of the display data needed for this grade of LED drive chip, it is simple to stablizing of LED drive chip.Certainly; described internal control coding/decoding module 230 is additionally operable to identify described synchronous code; when receiving extremely in the equipotential long code of synchronous code; such bit length code is considered abnormal data; LED is driven to show the abnormal picture preset now by PWM display module; cue is abnormal, and continues to forward normal synchronized code according to oneself state backward.
Described correction forwarding module 250, the data exported for the data exported by internal control coding/decoding module 230 and/or external control module 220 carry out frequency and duty cycle correction, the data after correction are exported to next stage LED drive chip by the output of LED drive chip.Existing B class scheme, there is no and display data are corrected, and the LED drive circuit considerable LED drive chip of series connection, data are when transmitting step by step, and the deviation of frequency and dutycycle can be accumulated, finally it is easily caused display data or the synchronous code that mistake occurs, therefore, the present invention arranges correction forwarding module 250 and data is carried out frequency and duty cycle correction, effectively raises the accuracy of data transmission, ensure the synchronization of display, also made LED drive circuit can connect more LED drive chip.Concrete, external control data that described correction forwarding module 250 exports for the synchronous code exported by internal control coding/decoding module 230, external control module 220 or the residue external control data after being extracted display data carry out frequency and duty cycle correction, the data after correction are exported to next stage LED drive chip by the output of LED drive chip.3rd output of described port detecting module connects the first input end of correction forwarding module, second output of described external control module and the second output of internal control coding/decoding module connect the second input of correction forwarding module, and the output of described correction forwarding module connects the input of next stage LED drive chip.
In sum, the present invention sends the synchronous code forwarding non-display data, the style of corresponding LED drive chip storage inside, and then the Display pattern that display synchronous code is corresponding by LED drive chip, and is forwarding next stage after synchronous code directly carries out transcoding.Synchronous code of the present invention can be self-defined, the Display pattern that definable is longer so that the series connection number of LED drive chip is not limited by display data length, is highly suitable for various LED driving and gulps down the transmission of pattern data.
Further, the display data and needed for described external control data at least include this grade of LED drive chip and follow-up all of LED drive chip assemble and put data, and concrete, the configuration data of described external control data only arrange one group；Described configuration data are for configuring the parameter of LED drive chip.
Described external control module 220, is additionally operable to, when the input of this grade of LED drive chip inputs external control data, obtain the configuration data being used for configuring the parameter of LED drive chip.Thus, described external control module 220 is specifically for when the input of this grade of LED drive chip inputs external control data, display data needed for extracting this grade of LED drive chip also obtain the configuration data of parameter for configuring LED drive chip, and export described external control data or the residue external control data after being extracted display data to next stage LED drive chip.The bit number of the display data needed for this grade of LED drive chip that external control module 220 is extracted is different from the bit number of configuration data, it is to avoid both are obscured by driving chip.
Described PWM display module 240, specifically for according to described display data and configuration data, controlling LED lamp and show, concrete, PWM display module 240 shows according to described display Data Control LED lamp, according to the parameter of configuration data configuration LED drive chip.
The present invention passes through external control module, when the input of this grade of LED drive chip inputs external control data, display data needed for extracting this grade of LED drive chip also obtain the configuration data of parameter for configuring LED drive chip, and export described external control data or the residue external control data after being extracted display data to next stage LED drive chip；Thus achieve the control to LED drive chip, do not interfere with normal display simultaneously.Described external control data include that showing that data and assemble puts data, and the data frame length of increase is the least, does not interferes with the quantity of the LED drive chip of series connection.The bit number of the display data needed for this grade of LED drive chip that described external control module is extracted is different from the bit number of configuration data so that display data and configuration data obfuscation will not be improve the stability of display by driving chip.
The present invention is by arranging configuration data in external control data so that the parameter of each LED drive chip can be configured by LED drive circuit by external control data.
Further, after described configuration data arrange and can be arranged on display data, it is also possible to before being arranged on display data；Preferably, in the present embodiment, after described configuration data are arranged on display data.
Described LED drive chip parameter includes one or more in the electric current of LED drive chip, the brightness of LED, gamma value (changing the gamma correction curve of PWM output), PWM refresh rate, energy-saving mode, test pattern, error detection pattern and frame length control code.Described frame length control code is for arranging the bit number of display data needed for this grade of LED drive chip, in other words, gulps down number of codes for control driving chip, such that it is able to the display precision of change chip.Concrete, owing to driving chip display frame rate and cascade chip number are to be inversely proportional to, so when needing the application cascading more and also the to be ensured frame per second of number, the bit number of display data can be reduced to ensure frame per second and cascade number；Can also improve display precision is up to 16bit simultaneously, it is seen then that the setting of frame length control code greatly improves flexibility, compatibility and the display precision that chip uses.It follows that only one need to be added after display data configure data, parameters can be configured to all of LED drive chip, it is also possible to needing the LED drive chip specified that parameters is separately configured, realize easily and efficiently showing control.Further, when described configuration data do not comprise the address of any LED drive chip, all of LED drive chip all shares this configuration data, i.e. these configuration data can configure the parameter of all of LED drive chip.When described configuration data are for configuring the parameter specifying LED drive chip, also include the address of this appointment LED drive chip, i.e., PWM display module 240 obtains the address in configuration data, judge that whether this address is exactly the address of this grade of LED drive chip, the most then according to the parameter of configuration data configuration LED drive chip；If it is not, then remaining display data and configuration data are transferred to next stage LED drive chip by external control module 220.
In the present invention, the bit number of described configuration data can be less than the bit number of the display data needed for LED drive chip, it is also possible to more than the bit number of the display data needed for LED drive chip.When bit number in configuration data is more than the bit number of the display data needed for LED drive chip, last LED drive chip is after receiving external control data, easily configuration data are treated as display data, therefore, in the present embodiment, the bit number of configuration data is less than the bit number of the display data needed for LED drive chip, and in other words, LED drive chip receives and any all will be identified as configuration data than being gulped down the little data segment of yard bit number.
Referring to Fig. 5, it is assumed that LED drive circuit is in series with five driving chip, each driving chip required display data are 24bit, and the bit number of configuration data is 16bit.Then the external control data of controller output are: the display data+configuration data of the display data+chip 5 of the display data+chip 4 of the display data+chip 3 of the display data+chip 2 of chip 1.First driving chip will gulp down 24bit data as display data, read 16bit simultaneously and configure data, and residue 96bit display data+16bit configuration data will be forwarded to the 2nd driving chip.2nd driving chip also will gulp down 24bit data after receiving data, and reads 16bit configuration data, then forward 72bit display data+16bit to configure data, the like.If during the configuration data of the display data+16bit that external control data are 24bit of controller output, the most do not show that data can gulp down during to the 3rd driving chip, because data are less than 24bit, so will read 16bit and configure data, continue thereafter with forwarding 16bit and configure data, and so on, the 4th and 5 driving chip also will be so.Why configure data to be necessarily less than single-stage and gulp down yardage and be because if greater than or be equal to, can be mistakenly considered to show that data gulp down display by driving chip.Concrete, described configuration data include the address of rear stage driving chip and the style mark of rear stage driving chip, every grade of driving chip forwards after all described address and style being identified superposition particular value when forwarding to rear stage, forward after+1, thus can derive very many combination control modes.
The present invention adds configuration data after display data, do not affect the agreement gulping down the transmission of pattern data, only add the simple configuration data gulping down yardage less than single-stage driving chip (IC) at Frame afterbody, and do not affect display frame rate, can be compatible with most controllers.The present invention can change the required bit number of single display of driving chip, owing to chip display frame rate and cascade chip number are to be inversely proportional to, so the bit number of display data can be reduced in the application needing cascade more and also the to be ensured frame per second of number to ensure frame per second and cascade number；Can also improve display precision is up to 16bit simultaneously, uses in order to higher-end application.
Above-described embodiment gives the method adding configuration data in external control data, further, it is possible to add configuration data in synchronous code, i.e. described synchronous code also includes configuring data as above.Configuration parameter is set in synchronous code, even if external transmission circuit breaks down, also can be by the synchronous code being internally generated, it is achieved to this grade of chip and the parameter configuration of follow-up chip, improve the stability that LED shows.Owing to described configuration data are added in synchronous code, identical with the effect of the principle being added in external control data, generation, therefore do not repeat them here.
It should be appreciated that the application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can be improved according to the above description or convert, all these modifications and variations all should belong to the protection domain of claims of the present invention.
Claims (9)
1. a LED drive chip, described LED drive chip is connected between upper level LED drive chip and next stage LED drive chip, it is characterised in that described LED drive chip includes:
Port detecting module, for detecting the data of the input input of this grade of LED drive chip；
Internal control coding/decoding module, is used for when the input of this grade of LED drive chip does not has data to input, the display data needed for this grade of LED drive chip of display extracting data of storage inside, and exports synchronous code to next stage LED drive chip；When the input of this grade of LED drive chip inputs synchronous code, corresponding relation according to the synchronous code pre-set Yu the display data of storage inside, display data needed for this grade of LED drive chip of display extracting data of storage inside, and export synchronous code to next stage LED drive chip；
PWM display module, for according to described display data, controls LED lamp and shows.
LED drive chip the most according to claim 1, it is characterised in that described synchronous code does not comprise display data；The synchronous code that this grade of LED drive chip exports to next stage LED drive chip is corresponding with the display data needed for next stage LED drive chip.
LED drive chip the most according to claim 2, it is characterized in that, described LED drive chip also includes external control module, for when the input of this grade of LED drive chip inputs external control data, extract the display data needed for this grade of LED drive chip, and described external control data or the residue external control data after being extracted display data are exported to next stage LED drive chip.
LED drive chip the most according to claim 3, it is characterized in that, described LED drive chip also includes correcting forwarding module, the data exported for the data exported by internal control coding/decoding module and/or external control module carry out frequency and duty cycle correction, the data after correction are exported to next stage LED drive chip by the output of LED drive chip.
LED drive chip the most according to claim 3, it is characterised in that the bit number of described synchronous code is less than or equal to the bit number of the display data needed for this grade of LED drive chip.
LED drive chip the most according to claim 1, it is characterized in that, the synchronous code of described internal control coding/decoding module output includes luminance control data, currently displaying frame number, the address of LED drive chip, display precision, style mark, display refreshing frequency, one or more in the configuration data regulating the parameter of LED drive chip.
LED drive chip the most according to claim 1, it is characterised in that whether described port detecting module has data to input, when there being data to input specifically for the input judging this grade of LED drive chip, it is judged that data are external control data or synchronous code.
The most according to claim 1, LED drive chip, it is characterised in that described LED drive chip also includes frequency control module, for according to the frequency control signal received, controlling the frequency that synchronous code sends.
9. a LED drive circuit, including controller, described controller is used for exporting external control data, it is characterized in that, described LED drive circuit also includes n the LED drive chip as described in claim 1-8 any one, n LED drive chip multi-stage LED in series drives, and the input of first order LED drive chip connects the output of controller.
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