CN105873290B - A kind of LED drive chip and LED drive circuit - Google Patents
A kind of LED drive chip and LED drive circuit Download PDFInfo
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- CN105873290B CN105873290B CN201610379081.XA CN201610379081A CN105873290B CN 105873290 B CN105873290 B CN 105873290B CN 201610379081 A CN201610379081 A CN 201610379081A CN 105873290 B CN105873290 B CN 105873290B
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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 a kind of LED drive chip and LED drive circuit, the driving chip includes port detecting module, internal control coding/decoding module and PWM display modules.The present invention, when input does not have data input, extracts the display data needed for this grade of LED drive chip, and export synchronous code to next stage LED drive chip by internal control coding/decoding module from the display data of storage inside；When input inputs synchronous code, according to the synchronous code and the corresponding relation of the display data of storage inside pre-set, the display data needed for this grade of LED drive chip is extracted from the display data of storage inside, and synchronous code is exported to next stage LED drive chip；LED lamps are controlled to show according to display data by PWM display modules.Thus, even if there is driving chip rosin joint occur, follow-up driving chip can still control LED to show the content for each needing to show, realize simultaneous display according to the corresponding relation of synchronous code and display data so that whole display system can continue to show.
Description
Technical field
The present invention relates to LED control technology field, more particularly to a kind of LED drive chip and LED drive circuit.
Background technology
At present, in the prior art, the LED drive chip for display system of connecting is connected in series step by step, external control data（Comprising aobvious
Registration evidence）Transmitted step by step between LED drive chips at different levels.When wherein there are one or more LED drive chips rosin joint occur, open
During the states such as short circuit, floating, external control data will be caused can not to be transmitted to rear stage LED drive chip, follow-up LED drive chip
Uncontrollable LED is shown.On the other hand, existing LED drive chip has two class actuation techniques to solve the above problems, respectively such as
Under：
A classes are that LED drive chip is normally shown under the control of normal external control data, when data input pin is extremely short-circuit,
During open circuit, i.e. when LED drive chip does not receive external control data, then show simple RGB styles.Although this kind of technology can ensure
Follow-up LED drive chip can control respective LED to continue to show, but because the LED drive chip of series connection is a lot, it is each
The style that LED is shown（The effect that display pattern is continuously varied to form）Can not be synchronous, can not meet the needs of LED displays.
B classes are when LED drive chip input is extremely short-circuit, during open circuit, i.e. LED drive chip does not receive external control number
According to when, send long string display data backward, the data segment that subsequent drive chip is captured corresponding to it after these data are obtained enters
Row display.Specifically, using the LED drive chip of B class schemes, when being not received by data frame, according to built-in effect algorithm
Display data is generated, this grade of display data is obtained from the display data of the generation；By the display data of the generation or
Next driving chip is sent to after extracting the remaining data shaping after this grade of display data.It follows that B class schemes are in external control
When data can not be transmitted backward, display data is generated by the effect algorithm built in itself, display data is continued to transmit backward,
Solve the display problem of follow-up LED drive chip, still, because the LED drive chip of series connection is more, the bit of display data
Number is longer, and long display data will cause loss of data, confusion, cause follow-up LED to show asynchronous or even can not show,
In other words, the LED drive chip of B classes scheme can not spreading tandem connection, i.e. the LED drive chip that B classes scheme can connect
Number is limited.
Therefore, how to solve the problems, such as that each chip behind failure driving chip is unable to simultaneous display, turn into this area
Need to solve the problems, such as, prior art has yet to be improved and developed.
The content 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 driving electricity
Road, it is intended to when solving for some LED drive chip failure in series connection display system in the prior art be present, cause subsequently to drive
The LED of dynamic chip connection can not be shown, can not simultaneous display the problem of.
Technical scheme is as follows：
A kind of LED drive chip, the LED drive chip are associated in upper level LED drive chip and next stage LED driving cores
Between piece, the LED drive chip includes：
Port detecting module, the data of the input input for detecting this grade of LED drive chip；
Internal control coding/decoding module, for when the input of this grade of LED drive chip does not have data input, from storage inside
Display data in extract display data needed for this grade of LED drive chip, and export to next stage LED drive chip synchronous
Code；When the input of this grade of LED drive chip inputs synchronous code, according to the display of the synchronous code and storage inside pre-set
The corresponding relation of data, the display data needed for this grade of LED drive chip is extracted from the display data of storage inside, and downwards
One-level LED drive chip exports synchronous code；
PWM display modules, for being shown according to the display data, control LED lamps.
In the LED drive chip, the synchronous code does not include display data；This grade of LED drive chip is to next stage LED
The synchronous code of driving chip output is corresponding with the display data needed for next stage LED drive chip.
In the LED drive chip, the LED drive chip also includes external control module, in this grade of LED drive chip
Input input external control data when, extract the display data needed for this grade of LED drive chip, and by the external control data or
It is extracted the remaining external control data output after display data and gives next stage LED drive chip.
In the LED drive chip, the LED drive chip also includes correction forwarding module, for by internal control encoding and decoding
The data of module output and/or the data of external control module output enter line frequency and duty cycle correction, and the data after correction are passed through
The output end of LED drive chip, which exports, gives next stage LED drive chip.
In the LED drive chip, the bit number of the synchronous code is less than or equal to needed for this grade of LED drive chip
The bit number of display data.
In the LED drive chip, the synchronous code of internal control coding/decoding module output includes luminance control data, current
Show that frame number, the address of LED drive chip, display precision, style identify, show refreshing frequency, for adjusting LED drive chip
Parameter configuration data in one or more.
In the LED drive chip, the port detecting module is specifically used for the input for judging this grade of LED drive chip
Whether data input is had, when there is data input, it is external control data or synchronous code to judge data.
In the LED drive chip, the LED drive chip also includes frequency control module, is received for basis
Frequency control signal, the frequency that control synchronous code is sent.
A kind of LED drive circuit, including controller, the controller are used to export external control data, the LED drive circuit
Also include n LED drive chips as described above, the multi-stage LED driving in series of n LED drive chip, first order LED drives
The output end of the input connection controller of dynamic chip.
Beneficial effect：A kind of LED drive chip and LED drive circuit are provided in the present invention, wherein, the LED drives core
Piece includes port detecting module, internal control coding/decoding module and PWM display modules.The present invention is by internal control coding/decoding module, at this
When the input of level LED drive chip does not have data input, this grade of LED drive chip is extracted from the display data of storage inside
Required display data, and export synchronous code to next stage LED drive chip；In the input input of this grade of LED drive chip
During synchronous code, according to the synchronous code and the corresponding relation of the display data of storage inside pre-set, from the display of storage inside
Display data needed for this grade of LED drive chip of extracting data, and export synchronous code to next stage LED drive chip；And then
By PWM display modules, LED lamps are controlled to be shown according to display data.Even if it follows that there is LED drive chip
There is rosin joint or circuit is not smooth, follow-up driving chip still can control LED according to the corresponding relation of synchronous code and display data
Display each needs the content shown, realizes simultaneous display so that whole display system can continue to show.
Brief description of the drawings
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 external control data
Schematic diagram.
Fig. 5 is in another embodiment of LED drive circuit of the present invention, and each LED drive chip reads external control data
Schematic diagram.
Embodiment
The present invention provides a kind of LED drive chip and LED drive circuit, to make the purpose of the present invention, technical scheme and effect
Fruit is clearer, clear and definite, and the present invention is described in more detail below.It should be appreciated that specific embodiment described herein is only
Only to explain the present invention, it is not intended to limit the present invention.
Fig. 1 is referred to, Fig. 1 is the structured flowchart of LED drive circuit provided by the invention.As shown in figure 1, the LED drives
Dynamic circuit includes controller 10 and n LED drive chip 20, wherein, n is the positive integer more than 1.N LED drive chip 20 is gone here and there
Connection forms multi-stage LED driving, the output end of the input connection controller 10 of first order LED drive chip 1.
The controller 10, for exporting external control data, the external control data include each LED drive chip institute of series connection
The display data needed.
The LED drive chip 20, for the data of detection input input, when input does not have data input, from interior
The display data needed for itself is extracted in the display data of portion's storage, according to the display data, control LED lamps are shown
Show, and synchronous code is exported to next stage LED drive chip；When input inputs synchronous code, according to the synchronous code pre-set
With the corresponding relation of the display data of storage inside, the display data needed for itself is extracted from the display data of storage inside,
According to the display data, control LED lamps are shown, and the synchronous code is modified, by needed for synchronous code and itself
The corresponding relation of display data be revised as with next stage LED drive chip needed for display data corresponding relation, and then to next
Synchronous code after level LED drive chip output modifications.Specifically, whole LED drive circuit is stored with LED drive chip 20
Display data, according to the position relationship connected between each LED drive chip, beforehand through synchronous code by LED drive chip
Address is corresponding with the display data needed for the LED drive chip so that LED drive circuit has indivedual or multiple LED drive chips
In rosin joint, when opening the states such as short circuit, floating, follow-up LED drive chip can also be obtained by the synchronous code transmitted step by step
Required display data, the display control to LED is completed, also, synchronous code is different from display data, can set very
It is short, do not shown by bit number, therefore, LED drive circuit can connect infinite multiple LED drive chips in theory, will not go out
Existing loss of data, it is chaotic situations such as, and simultaneous display can be realized, compared with prior art B classes scheme have it is obvious progressive.
Further, referring to Fig. 2, the LED drive chip provided by the invention is connected on upper level LED drive chip
Between next stage LED drive chip, i.e. it is connected in series with multiple LED drive chips, it include port detecting module 210,
External control module 220, internal control coding/decoding module 230, PWM display modules 240 and correction forwarding module 250.
The port detecting module 210, for detecting this grade of LED drive chip（That is, the LED drive chip where itself）
Input input data, detect data, not only include the type of detection data, in addition to detect the presence of data.Specifically,
The port detecting module 210 is used to judge whether the input of this grade of LED drive chip has data input in the given time,
When having data input in the given time, it is external control data or synchronous code to judge data, and will determine that result is exported to internal control
Coding/decoding module 230.In other words, data are received in the scheduled time, then illustrate that input has data input；In the scheduled time
Data are not received by, then illustrate that input does not have data input.
The internal control coding/decoding module 230, for when the input of this grade of LED drive chip does not have data input（Such as
The input end of LED drive chip in rosin joint, open the states such as short circuit, floating when）, this is extracted from the display data of storage inside
Display data needed for level LED drive chip, and export synchronous code to next stage LED drive chip；In this grade of LED drive chip
Input input synchronous code when, according to the synchronous code and the corresponding relation of the display data of storage inside pre-set, from interior
The display data needed for this grade of LED drive chip is extracted in the display data of portion's storage, and is exported to next stage LED drive chip
Synchronous code.
The PWM display modules 240, for according to the display data, controlling what is electrically connected with this grade of LED drive chip
LED is shown.
The output end or controller 10 of the input connection upper level LED drive chip of the port detecting module 210
Output end, the input of the first output end connection internal control coding/decoding module 230 of the port detecting module 210, it is described in
The first output end connection PWM display modules 240 of control-register decoder module 230.
Further, the synchronous code does not include display data.It is higher the bit error rate to be present in longer data, such as existing B
In class scheme, first order driving chip is as crossed the field of error code 101, then subordinate's driving chip will not be modified, it is believed that number
According to correct and transmit backward, because data are longer, the bit error rate will raising, the data that driving chip below receives will be prime
The sum data of all chip error codes.And the synchronous code of the present invention does not include display data, corrected, avoided using short data step by step
The error condition that B classes scheme occurs.That is, of the LED drive chip of LED drive circuit series connection is meaned not comprising display data
Number is unrestricted, in long series connection display, the problems such as accumulation in the absence of the error code occurred in prior art B class schemes.
In the present invention, this grade of LED drive chip is driven to the synchronous code that next stage LED drive chip exports and next stage LED
Display data needed for dynamic chip is corresponding.So next stage LED drive chip is received after synchronous code with regard to that can obtain needed for itself
Display data, realize the simultaneous display of whole circuit.Certainly, the synchronous code can include and follow-up all LED drive chips
The corresponding relation of required display content, follow-up LED drive chip directly transmit the synchronous code, still, so set and cause
The bit number of synchronous code is longer.Therefore, in this preferred embodiment, this grade of LED drive chip exports to next stage LED drive chip
Synchronous code it is only corresponding with the display data needed for next stage LED drive chip, in other words, the output of this grade of LED drive chip
Synchronous code only comprising corresponding relation with the display data needed for next stage LED drive chip, no matter LED drive circuit concatenates
How many driving chips, synchronous code is all only with a display data corresponding, and its bit number can be with very little（That is, frame length is very short）, and
The B classes scheme of prior art does not possess this characteristic, the present invention in this way, data delay can be reduced to greatest extent, with
Existing B classes scheme is compared, and greatly improves the synchronous precision of each LED drive chip.
Further, the synchronous code that the internal control coding/decoding module 230 exports includes luminance control data, current display frame
Number, the address of LED drive chip, display precision, style mark, display refreshing frequency, the parameter for adjusting LED drive chip
Configuration data in one or more.The luminance control data is used for the LED for configuring the driving of next stage LED drive chip
The brightness of pearl.The current display frame number, frame number corresponding to this grade of LED drive chip current picture is represented, so as to next stage LED
Driving chip simultaneous display.The address of the LED drive chip, that is, need the address of LED drive chip controlled.The display
Precision, i.e. the display bit numbers of next stage LED drive chip, usually 8-16bit.The style mark is corresponding with style, under
One-level LED drive chip identifies according to the style, transfers the display data of corresponding style, style corresponding to display, thus, respectively
Individual LED drive chip can control LED display to realize simultaneous display according to the synchronous code.The display refreshing frequency, is used for
Control the display refreshing frequency of next stage LED drive chip.
The controller, including fault detection unit.The fault detection unit is used for output calibration code, the correcting code
It is a kind of special synchronous code, i.e. the bit number of the correcting code is identical with the synchronous code.The correcting code and predetermined event
It is corresponding to hinder style, i.e. the correcting code is corresponding with display data corresponding to predetermined failure style.Exported in fault detection unit
After the correcting code, each LED drive chip will show predetermined failure style, then the driving chip of this non-style is exactly event
Hinder chip；The position of the LED drive chip of failure can be so found out, without artificial detection, greatly improves maintenance
Efficiency.Because LED drive chip is connected in series, the address of each chip and the type of style have continuity（It is primarily referred to as
The continuity of set fixed step size）, only need to be to synchronous code after internal control coding/decoding module 230 extracts display data according to synchronous code
Carry out transcoding, you can the synchronous code after transcoding is exported and gives next stage LED drive chip, without regenerating, saves computing
Time.
The style mark includes the frame information of the style.The frame information is used to indicate corresponding frame in a style
（Picture）, i.e. frame corresponding to global systemic circulation, LED drive chip show the corresponding frame of corresponding style according to frame information, by
This, the precision of simultaneous display has reached the rank of a frame, in other words, frame information is added in synchronous code so that whole LED
Drive circuit can make each frame of style of each LED drive chip control all synchronous, each LED drive chip reading synchronous code
Principle it is as shown in Figure 3.As can be seen here, the setting of synchronous code, it can realize that more kinds of styles show in the range of code in limited gulping down
Show, and have the addition of address so that display length is extremely easily controlled.
Further, the LED drive chip also includes frequency control module（Not shown in figure）, it is outside defeated for receiving
The frequency control signal gone out, according to the frequency control signal received, the frequency of control synchronous code transmission.The frequency that synchronous code is sent
Rate, refer to sending several groups of synchronous codes in 1 second.The frequency control signal is periodically pulsing signal, specifically, can be
AC signal（AC signals）.The frequency control signal can be sent by controller, can also be directly connected to AC power.Specifically
, the frequency of the frequency control module extraction frequency control signal, adjusted by the prearranged multiple of the frequency of frequency control signal
Save the frequency that synchronous code is sent.The prearranged multiple can be set according to actual conditions, be positive number, such as 1,0.5,2 ....Frequently
The setting of rate control module, in that context it may be convenient to control the display frequency of the display screen of follow-up LED drive chip control.
In the present embodiment, the input rate of connections control signal of the frequency control module provides end, the frequency control
The output end connection internal control coding/decoding module of molding block.In other words, n LED drive chip multi-stage LED in series of the present invention
In the circuit of driving, all LED drive chips are connected in parallel control signal and provide end, if not using controller, i.e. all
LED drive chip can not receive external control data, then all LED drive chips are shown all in accordance with synchronous code, therefore, pass through frequency
Control module can make all LED drive chip simultaneous displays.
Please continue to refer to Fig. 2, the external control module 220, external control number is inputted for the input in this grade of LED drive chip
According to when, extract the display data needed for this grade of LED drive chip, and by the external control data or after being extracted display data
Remaining external control data output gives next stage LED drive chip.In the present invention, the data transfer of LED drive chip, which can use, gulps down code
Transmission, the non-code that gulps down can also be used to transmit.In the present embodiment, for the quantity for reducing bit number, improving series chip, using gulping down code
Transmission, i.e. after external control module 220 receives external control data, extract the display data needed for this grade of LED drive chip, and will carry
The remaining external control data output after display data has been taken to give next stage LED drive chip, LED drive chip reads display data
Schematic diagram is as shown in Figure 4.The input of the second output end connection external control module 220 of the port detecting module 210, it is described outer
Control the first output end connection PWM display modules of module 220.
Further, the bit number of the synchronous code is less than or equal to the display data needed for this grade of LED drive chip
Bit number, in other words, the bit number of the display data that LED drive chip gulps down is more than or equal to the bit of the synchronous code
Number., it is necessary to be identified when the bit number for the display data that LED is gulped down is identical with the bit number of synchronous code, otherwise chip holds
Easily obscure, lead to not normally show.Therefore in the present embodiment, the bit number of the synchronous code is less than this grade of LED drive chip institute
The bit number of the display data needed, it is easy to the stabilization of LED drive chip.Certainly, the internal control coding/decoding module 230 is additionally operable to know
Not described synchronous code, when receiving exception in the equipotential long code of synchronous code, such bit length code is considered as abnormal data, now leads to
Cross PWM display modules driving LED and show default abnormal picture, cue is abnormal, and continues backward according to oneself state
Forward normal synchronized code.
The correction forwarding module 250, for the data and/or external control module 220 for exporting internal control coding/decoding module 230
The data of output enter line frequency and duty cycle correction, and the data after correction are exported under by the output end of LED drive chip
One-level LED drive chip.Existing B classes scheme, has no and display data is corrected, and LED drive circuit series connection is quite a lot of
LED drive chip, when transmitting step by step, the deviation of frequency and dutycycle can accumulate data, finally easily cause mistake occur
Display data or synchronous code, therefore, the present invention sets correction forwarding module 250 to carry out frequency and duty cycle correction to data,
The accuracy of data transfer is effectively raised, the synchronization of display has been ensured, LED drive circuit is connected more LED
Driving chip.Specifically, the correction forwarding module 250 is used for synchronous code, the external control mould for exporting internal control coding/decoding module 230
External control data that block 220 exports are extracted the remaining external control data after display data and enter line frequency and duty cycle correction, will
Data after correction are exported by the output end of LED drive chip gives next stage LED drive chip.The port detecting module
The first input end of 3rd output end connection correction forwarding module, the second output end and internal control encoding and decoding mould of the external control module
Second input of the second output end connection correction forwarding module of block, the output end connection next stage of the correction forwarding module
The input of LED drive chip.
In summary, the present invention sends the synchronous code for forwarding non-display data, corresponding LED drivings by LED drive chip
Chip internal storage style, and then show synchronous code corresponding to Display pattern, and directly by synchronous code carry out transcoding after
Forward next stage.Synchronous code of the present invention can be with self-defined, the longer Display pattern of definable so that LED drive chip
Series connection number is not limited by display data length, is highly suitable for various LED drivings and is gulped down pattern data transfer.
Further, the external control data comprise at least this grade of LED drive chip and follow-up all LED drive chip institutes
The display data and one group of configuration data needed, specifically, the configuration data of the external control data only sets one group；The configuration
Data are used for the parameter for configuring LED drive chip.
The external control module 220, it is additionally operable to, when the input of this grade of LED drive chip inputs external control data, obtain and use
In the configuration data of the parameter of configuration LED drive chip.Thus, the external control module 220 is specifically used for driving core in this grade of LED
During the input input external control data of piece, extract the display data needed for this grade of LED drive chip and obtain for configuring LED drives
The configuration data of the parameter of dynamic chip, and by the external control data or it is extracted the remaining external control data output after display data
Give next stage LED drive chip.External control module 220 extract this grade of LED drive chip needed for display data bit number with
The bit number of configuration data is different, avoids driving chip from obscuring both.
The PWM display modules 240, specifically for being carried out according to the display data and configuration data, control LED lamps
It has been shown that, specifically, PWM display modules 240 control LED lamps to be shown according to the display data, matched somebody with somebody according to configuration data
Put the parameter of LED drive chip.
The present invention, when the input of this grade of LED drive chip inputs external control data, extracts this level by external control module
Display data needed for LED drive chip simultaneously obtains the configuration data of the parameter for configuring LED drive chip, and will be described outer
Control data are extracted the remaining external control data output after display data and give next stage LED drive chip；Thus achieve pair
The control of LED drive chip, while do not interfere with normal display.The external control data are assembled including display data and one and put
Data, increased data frame length very little, the quantity of the LED drive chip of series connection is not interfered with.The external control module extraction
The bit number of display data needed for this grade of LED drive chip is different from the bit number of configuration data so that driving chip will not
Display data and configuration data are obscured, improve the stability of display.
The present invention in external control data by setting a configuration data so that LED drive circuit can pass through external control data
The parameter of each LED drive chip is configured.
Further, the configuration data sets and can be arranged on after display data, can also be arranged on display data
Before；Preferably, in the present embodiment, the configuration data is arranged on after display data.
The LED drive chip parameter includes the electric current of LED drive chip, the brightness of LED, gamma value（It is defeated to change PWM
The gamma correction curve gone out）, PWM refresh rates, energy-saving mode, test pattern, one in error detection pattern and frame length control code
Kind is a variety of.The frame length control code is used for the bit number for setting the display data needed for this grade of LED drive chip, for changing
It, gulps down number of codes, so as to change the display precision of chip for control driving chip.Specifically, due to driving chip
Display frame rate and cascade chip number are to be inversely proportional, so when needing cascade number more and also to ensure the application of frame per second, can
Ensure frame per second and cascade number to reduce the bit numbers of display data；Display precision, which can also be improved, is up to 16bit simultaneously, it is seen then that
The setting of frame length control code greatly improves flexibility, compatibility and display precision that chip uses.It follows that only need to be
A configuration data is added after display data, you can configure parameters to all LED drive chips, can also give needs
Parameters are separately configured in the LED drive chip specified, and easily and efficiently realize display control.Further, the configuration number
During according to address not comprising any LED drive chip, all LED drive chips share the configuration data, i.e. the configuration number
According to the parameter of configurable all LED drive chips.When the configuration data is used to configure the parameter of specified LED drive chip,
Also include the address for specifying LED drive chip, i.e. PWM display modules 240 obtain the address in configuration data, judge the ground
Whether location is exactly the address of this grade of LED drive chip, if so, then configuring the parameter of LED drive chip according to configuration data；If no
It is that remaining display data and configuration data are then transferred to by next stage LED drive chip by external control module 220.
In the present invention, the bit number of the configuration data can be less than the bit of the display data needed for LED drive chip
Number, the bit number of the display data needed for LED drive chip can also be more than.Driven in the bit number of configuration data more than LED
During the bit number of the display data needed for chip, last LED drive chip, easily will configuration after external control data are received
Data treat as display data, and therefore, in the present embodiment, the bit number of configuration data is less than the display number needed for LED drive chip
According to bit number, in other words, LED drive chip receives any data segment smaller than gulping down yard bit number and will be all identified as
Configuration data.
Referring to Fig. 5, assume that LED drive circuit is in series with five driving chips, display data needed for each driving chip
For 24bit, the bit number of configuration data is 16bit.Then the external control data of controller output are：Display data+chip of chip 1
Display data+configuration data of display data+chip 5 of display data+chip 4 of 2 display data+chip 3.First drive
Dynamic chip will gulp down 24bit data as display data, while read 16bit configuration datas, and remaining 96bit display datas+
16bit configuration datas will be forwarded to the 2nd driving chip.2nd driving chip will also gulp down 24bit data after receiving data,
And 16bit configuration datas are read, 72bit display data+16bit configuration datas are then forwarded, the like.If controller exports
External control data be 24bit display data+16bit configuration data when, to during the 3rd driving chip without display number
According to that can gulp down, because data are less than 24bit, then 16bit configuration datas will be read, continue thereafter with forwarding 16bit configuration numbers
According to, and so on, the 4th and 5 driving chip also will be such.It is because such as that why configuration data, which is necessarily less than single-stage to gulp down yardage,
Fruit is more than or equal to, and can be mistakenly considered display data by driving chip and gulp down display.Specifically, the configuration data is including latter
The address of level driving chip and the style mark of rear stage driving chip, every grade of driving chip to rear stage when forwarding all by institute
Forwarded after stating address and style mark superposition particular value, forwarded after such as+1, thus can derive very more combination control modes.
The present invention adds configuration data after display data, does not influence to gulp down the agreement of pattern data transfer, only in data
Tail, which adds, is simply less than single-stage driving chip（IC）Gulp down the configuration data of yardage, and do not influence display frame rate, can with it is exhausted
Most number controller is compatible.The present invention can change bit numbers needed for single of driving chip display, due to chip display frame rate and
Cascade chip number is to be inversely proportional, so needing cascade number more and also to ensure that in the application of frame per second display number can be reduced
According to bit numbers come ensure frame per second and cascade number；Display precision, which can also be improved, is up to 16bit simultaneously, makes to higher-end application
With.
Above-described embodiment gives the method that configuration data is added in external control data, further, also can be in synchronous code
Middle addition configuration data, i.e. the synchronous code also includes configuration data as described above.Configuration parameter is set in synchronous code,
Even if external transmission lines road is broken down, can also be realized by the synchronous code of inside generation to this grade of chip and follow-up core
The parameter configuration of piece, improve the stability that LED is shown.Because the configuration data is added in synchronous code, with being added in external control number
Principle, caused effect in is identical, therefore will not be repeated 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
To be improved or converted according to the above description, all these modifications and variations should all belong to the guarantor of appended claims of the present invention
Protect scope.
Claims (8)
1. a kind of LED drive chip, the LED drive chip is connected on upper level LED drive chip and next stage LED driving cores
Between piece, it is characterised in that the LED drive chip includes：
Port detecting module, the data of the input input for detecting this grade of LED drive chip；
Internal control coding/decoding module, for when the input of this grade of LED drive chip does not have data input, from the aobvious of storage inside
Show the display data needed for this grade of LED drive chip of extracting data, and synchronous code is exported to next stage LED drive chip；
When the input of this grade of LED drive chip inputs synchronous code, according to the synchronous code and the display data of storage inside pre-set
Corresponding relation, extract the display data needed for this grade of LED drive chip from the display data of storage inside, and to next stage
LED drive chip exports synchronous code；
PWM display modules, for being shown according to the display data, control LED lamps；
The synchronous code does not include display data, is corrected using short data step by step, and the number of the LED drive chip of series connection is unrestricted
System；The synchronous code that this grade of LED drive chip is exported to next stage LED drive chip only with next stage LED drive chip needed for
Display data is corresponding；No matter how many LED drive chip are concatenated, and synchronous code is all only corresponding with a display data.
2. LED drive chip according to claim 1, it is characterised in that the LED drive chip also includes external control module,
For when the input of this grade of LED drive chip inputs external control data, extracting the display number needed for this grade of LED drive chip
According to, and by the external control data or be extracted the remaining external control data output after display data and give next stage LED drive chip.
3. LED drive chip according to claim 2, it is characterised in that the LED drive chip also includes correction forwarding mould
Block, the data of data and/or external control the module output for internal control coding/decoding module to be exported enter line frequency and duty cycle correction,
Data after correction are exported by the output end of LED drive chip and give next stage LED drive chip.
4. LED drive chip according to claim 2, it is characterised in that the bit number of the synchronous code is less than or equal to
The bit number of display data needed for this grade of LED drive chip.
5. LED drive chip according to claim 1, it is characterised in that the synchronous code of the internal control coding/decoding module output
Refresh frequency including luminance control data, current display frame number, the address of LED drive chip, display precision, style mark, display
One or more in rate, the configuration data of parameter for adjusting LED drive chip.
6. LED drive chip according to claim 1, it is characterised in that the port detecting module is specifically used for judging this
Whether the input of level LED drive chip has data input, and when there is data input, it is external control data or synchronization to judge data
Code.
7. LED drive chip according to claim 1, it is characterised in that the LED drive chip also includes FREQUENCY CONTROL mould
Block, for the frequency sent according to the frequency control signal received, control synchronous code.
8. a kind of LED drive circuit, including controller, the controller is used to export external control data, it is characterised in that described
LED drive circuit also includes the n LED drive chips as described in claim 1-7 any one, n LED drive chip series connection
Form multi-stage LED driving, the output end of the input connection controller of first order LED drive chip.
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| CN201610379081.XA CN105873290B (en) | 2016-05-31 | 2016-05-31 | A kind of LED drive chip and LED drive circuit |
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| CN201610379081.XA CN105873290B (en) | 2016-05-31 | 2016-05-31 | A kind of LED drive chip and LED drive circuit |
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| CN111405710B (en) * | 2020-02-21 | 2022-06-21 | 鹰潭阳光照明有限公司 | Intelligent LED lamp circuit |
| US11482293B2 (en) * | 2020-08-06 | 2022-10-25 | Novatek Microelectronics Corp. | Control system with cascade driving circuits and related driving method |
| CN112911768A (en) * | 2021-02-01 | 2021-06-04 | 佛山市南海舒博光电科技有限公司 | Laser lamp ILDA signal processing system and processing method thereof |
| CN115547240A (en) * | 2021-06-30 | 2022-12-30 | 深圳市明微电子股份有限公司 | Configuration method, driving method and device of LED display screen |
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| CN101340757B (en) * | 2008-07-21 | 2012-07-04 | 北京巨数数字技术开发有限公司 | Single line transmission protocol of lamp spot display chip concatenated signal |
| US20130147369A1 (en) * | 2011-12-13 | 2013-06-13 | Gemmy Industries Corporation | Led light string and led module with an integrated signal controller thereof |
| CN202871258U (en) * | 2012-07-03 | 2013-04-10 | 深圳市磊芯半导体有限公司 | LED driving chip cascade circuit |
| CN202907303U (en) * | 2012-11-09 | 2013-04-24 | 深圳市晟碟半导体有限公司 | An internally-controlled LED cascade structure |
| CN102945653B (en) * | 2012-11-09 | 2014-11-26 | 深圳市晟碟半导体有限公司 | Method and system for realizing internal control display of cascade LED (light-emitting diode) chip |
| CN202907302U (en) * | 2012-11-09 | 2013-04-24 | 深圳市晟碟半导体有限公司 | A cascade structure of a LED lamp string |
| CN104517569B (en) * | 2014-12-15 | 2017-08-25 | 深圳市明微电子股份有限公司 | Display system of connecting and its data transmission method |
| CN105072756A (en) * | 2015-08-03 | 2015-11-18 | 深圳市明微电子股份有限公司 | Light-emitting diode (LED) constant current driving circuit, driving chip and control method of driving chip |
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