CN205793511U - A kind of LED drive circuit of configurable parameter - Google Patents

A kind of LED drive circuit of configurable parameter Download PDF

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Publication number
CN205793511U
CN205793511U CN201620517055.4U CN201620517055U CN205793511U CN 205793511 U CN205793511 U CN 205793511U CN 201620517055 U CN201620517055 U CN 201620517055U CN 205793511 U CN205793511 U CN 205793511U
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China
Prior art keywords
led drive
drive chip
data
video data
external control
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CN201620517055.4U
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Chinese (zh)
Inventor
林斌斌
姚瑞琨
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深圳君略科技有限公司
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Abstract

The utility model discloses the LED drive circuit of a kind of configurable parameter, including controller and n LED drive chip.This utility model passes through LED drive chip, when input input external control data, video data needed for extracting this grade of LED drive chip also obtains the configuration data of parameter for configuring LED drive chip, and exports external control data or the residue external control data after being extracted video data to next stage LED drive chip;Thus achieve the control to LED drive chip, do not interfere with normal display.Described external control data include that video data and assembles and put 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 video data that LED drive chip is extracted is different from the bit number of configuration data so that video data and configuration data obfuscation will not be improve the stability of display by driving chip.

Description

A kind of LED drive circuit of configurable parameter

Technical field

This utility model relates to LED and controls technical field, particularly relates to the LED drive circuit of a kind of configurable parameter.

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 video data) are transmitted between LED drive chip at different levels step by step.When needs control each LED drive chip, need to individually send configuration data and LED drive chip is controlled, so make control efficiency the highest, and display can be interrupted, it addition, configuration data are also easily processed by driving chip as video data, cause situation about cannot show.

Therefore, prior art has yet to be improved and developed.

Utility model content

In view of above-mentioned the deficiencies in the prior art, the purpose of this utility model is to provide the LED drive circuit of a kind of configurable parameter, by the way of video data and being set and assembles and put data, it is achieved that the control to LED drive chip, do not interfere with normal display simultaneously.

The technical solution of the utility model is as follows:

A kind of LED drive circuit of configurable parameter, including:

For exporting the controller of external control data, described external control data include series connection each LED drive chip needed for video data and one group for configuring the configuration data of the parameter of LED drive chip;

For detecting the data of input input, when input input external control data, extract self required video data and obtain configuration data, according to described video data and configuration data, controlling LED and show accordingly;And described external control data or the residue external control data after being extracted video data are exported to the LED drive chip of next stage LED drive chip;

The bit number of self required video data that described LED drive chip is extracted is different from the bit number of configuration data;

Described LED drive chip is provided with n, and n is the positive integer more than 1;N LED drive chip multi-stage LED in series drives, and the input of first order LED drive chip connects the outfan of controller.

In the LED drive circuit of described configurable parameter, described LED drive chip includes:

For detecting the port detecting module of the data that the input of this grade of LED drive chip inputs;

For when the input of this grade of LED drive chip inputs external control data, video data needed for extracting this grade of LED drive chip also obtains the configuration data of parameter for configuring LED drive chip, and exports described external control data or the residue external control data after being extracted video data to the external control module of next stage LED drive chip;

For according to described video data and configuration data, controlling the PWM display module that LED lamp shows accordingly;

Described port detecting module connects the input of external control module, and the first outfan of described external control module connects PWM display module.

In the LED drive circuit of described configurable parameter, after described configuration data are arranged on video data.

In the LED drive circuit of described configurable parameter, the parameter of described LED drive chip includes one or more in the electric current of LED drive chip, the brightness of LED, gamma value, PWM refresh rate and frame length control code, and described frame length control code is for arranging the bit number of the video data needed for this grade of LED drive chip.

In the LED drive circuit of described configurable parameter, the bit number of described configuration data is less than the bit number of the video data needed for LED drive chip.

In the LED drive circuit of described configurable parameter, when described configuration data are for configuring the parameter specifying LED drive chip, also include the address of this appointment LED drive chip.

In the LED drive circuit of described configurable parameter, LED drive chip also includes: for when the input of this grade of LED drive chip does not has data to input, from the video data of storage inside, extract the video data needed for this grade of LED drive chip, 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 video data of storage inside, the video data needed for this grade of LED drive chip is extracted from the video data of storage inside, and to the internal control coding/decoding module of next stage LED drive chip output synchronous code;

Described port detecting module connects the input of internal control coding/decoding module, and the first outfan of described internal control coding/decoding module connects PWM display module.

In the LED drive circuit of described configurable parameter, described synchronous code does not comprise video data;The synchronous code that this grade of LED drive chip exports to next stage LED drive chip is corresponding with the video data needed for next stage LED drive chip.

In the LED drive circuit of described configurable parameter, described LED drive chip also includes: the data for the data exported by internal control coding/decoding module and/or the output of external control module carry out frequency and duty cycle correction, the data after correction is exported to the correction forwarding module of next stage LED drive chip by the outfan of LED drive chip;

Described port detecting module connects the first input end of correction forwarding module, second outfan of described external control module and the second outfan of internal control coding/decoding module connect the second input of correction forwarding module, and the outfan of described correction forwarding module connects the input of next stage LED drive chip.

Beneficial effect: provide the LED drive circuit of a kind of configurable parameter in this utility model, including controller and n LED drive chip.This utility model passes through LED drive chip, when the input of this grade of LED drive chip inputs external control data, video data needed for extracting this grade of LED drive chip also obtains the configuration data of parameter for configuring LED drive chip, and exports described external control data or the residue external control data after being extracted video 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 video data and assembles and put 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 self required video data that described LED drive chip is extracted is different from the bit number of configuration data so that video data and configuration data obfuscation will not be improve the stability of display by driving chip.

Accompanying drawing explanation

Fig. 1 is the structured flowchart of the LED drive circuit of configurable parameter described in the utility model.

Fig. 2 is the structured flowchart of the LED drive chip of configurable parameter described in the utility model.

Fig. 3 is in the LED drive circuit of configurable parameter described in the utility model, and each LED drive chip reads the schematic diagram of synchronous code.

Fig. 4 is in an embodiment of the LED drive circuit of configurable parameter described in the utility model, and each LED drive chip reads the schematic diagram of external control data.

Fig. 5 is in another embodiment of the LED drive circuit of configurable parameter described in the utility model, and each LED drive chip reads the schematic diagram of external control data.

Detailed description of the invention

This utility model provides the LED drive circuit of a kind of configurable parameter, for making the purpose of this utility model, technical scheme and effect clearer, clear and definite, further describes this utility model below.Should be appreciated that specific embodiment described herein, only in order to explain this utility model, is not used to limit this utility model.

Refer to the structured flowchart of the LED drive circuit of the configurable parameter that Fig. 1, Fig. 1 provide for this utility model.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 outfan of controller 10.

Described controller 10, is used for exporting external control data, and described external control data include the video data needed for each LED drive chip of series connection.

Described LED drive chip 20, for detecting the data of input input, when input input external control data, extracts self required video data and obtains configuration data, according to described video data and configuration data, controlling LED and show accordingly;And described external control data or the residue external control data after being extracted video data are exported to next stage LED drive chip;When input does not has data to input, from the video data of storage inside, extract self required video data, according to described video 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 video data of storage inside, self required video data is extracted from the video data of storage inside, according to described video data, control LED lamp to show, and this synchronous code is modified, by synchronous code with self needed for the corresponding relation of video data be revised as with next stage LED drive chip needed for the corresponding relation of video data, and then the synchronous code after next stage LED drive chip output modifications.Preferably, described synchronous code is the square-wave signal of low and high level composition.nullConcrete,In LED drive chip 20, storage has the video 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 video 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 video data needed for the synchronous code acquisition transmitted step by step,Complete the display to LED to control,And,Synchronous code is different from video 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 this utility model 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), from the video data of storage inside, extract the video data needed for this grade of LED drive chip, 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 video data of storage inside, from the video data of storage inside, extract the video data needed for this grade of LED drive chip, and export synchronous code to next stage LED drive chip.

Described PWM display module 240, for according to described video data, controls show corresponding to the LED of this grade of LED drive chip electrical connection.

The input of described port detecting module 210 connects outfan or the outfan of controller 10 of upper level LED drive chip, first outfan of described port detecting module 210 connects the input of internal control coding/decoding module 230, and the first outfan of described internal control coding/decoding module 230 connects PWM display module 240.

Further, described synchronous code does not comprise video 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 synchronous code of the present utility model does not comprise video 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 video data means that LED drive circuit connects is unrestricted, when long series connection display, there is not the problems such as the error code accumulation that occurs in prior art B class scheme.

In this utility model, the synchronous code that this grade of LED drive chip exports to next stage LED drive chip is corresponding with the video data needed for next stage LED drive chip.Self required video 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 video 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 video data, no matter LED drive circuit has concatenated how many driving chip, synchronous code is all only corresponding with a video 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, this utility model 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 video 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. the described correcting code video data corresponding with predetermined fault style is 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 seriality (being primarily referred to as the seriality of set step-length), after internal control coding/decoding module 230 extracts video 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 alternating current power supply.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 practical situation, 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 outfan 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 video data needed for this grade of LED drive chip, and described external control data or the residue external control data after being extracted video data are exported to next stage LED drive chip.In this utility model, 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 video data needed for this grade of LED drive chip, and the residue external control data after being extracted video data export to next stage LED drive chip, LED drive chip reads the schematic diagram of video data as shown in Figure 4.Second outfan of described port detecting module 210 connects the input of external control module 220, and the first outfan 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 video data needed for this grade of LED drive chip, and in other words, the bit number of the video 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 video 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 video 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 outfan of LED drive chip.Existing B class scheme, there is no and video data is corrected, and the LED drive circuit considerable LED drive chip of series connection, data are when transmitting step by step, the deviation of frequency and dutycycle can be accumulated, finally it is easily caused video data or the synchronous code that mistake occurs, therefore, this utility model arranges correction forwarding module 250 and data is carried out frequency and duty cycle correction, effectively raise 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 video data carry out frequency and duty cycle correction, the data after correction are exported to next stage LED drive chip by the outfan of LED drive chip.3rd outfan of described port detecting module connects the first input end of correction forwarding module, second outfan of described external control module and the second outfan of internal control coding/decoding module connect the second input of correction forwarding module, and the outfan of described correction forwarding module connects the input of next stage LED drive chip.

In sum, this utility model sends the synchronous code forwarding non-display data by LED drive chip, the style of corresponding LED drive chip storage inside, and then the Display pattern that display synchronous code is corresponding, and forwarding next stage after directly synchronous code is carried out transcoding.This utility model synchronous code 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 video data length, is highly suitable for various LED driving and gulps down the transmission of pattern data.

Further, the video 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 assembles and puts 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.Preferably, described external control data are the square-wave signal of low and high level composition.

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, video data needed for extracting this grade of LED drive chip also obtains the configuration data of parameter for configuring LED drive chip, and exports described external control data or the residue external control data after being extracted video data to next stage LED drive chip.The bit number of the video 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 video data and configuration data, controlling LED lamp and show, concrete, PWM display module 240 controls LED lamp according to described video data and shows, according to the parameter of configuration data configuration LED drive chip.

This utility model passes through external control module, when the input of this grade of LED drive chip inputs external control data, video data needed for extracting this grade of LED drive chip also obtains the configuration data of parameter for configuring LED drive chip, and exports described external control data or the residue external control data after being extracted video 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 video data and assembles and put 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 video 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 video data and configuration data obfuscation will not be improve the stability of display by driving chip.

This utility model 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 video data, it is also possible to before being arranged on video data;Preferably, in the present embodiment, after described configuration data are arranged on video 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 video data needed for this grade of LED drive chip, in other words, gulps down number of codes, such that it is able to change the display precision of chip for control driving 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 video 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 motility, compatibility and the display precision that chip uses.It follows that configuration data only need to be added after video 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 display easily and efficiently and 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 video data and configuration data are transferred to next stage LED drive chip by external control module 220.

In this utility model, the bit number of described configuration data can be less than the bit number of the video data needed for LED drive chip, it is also possible to more than the bit number of the video data needed for LED drive chip.When bit number in configuration data is more than the bit number of the video data needed for LED drive chip, last LED drive chip is after receiving external control data, easily configuration data are treated as video data, therefore, in the present embodiment, the bit number of configuration data is less than the bit number of the video 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 needed for LED drive circuit is in series with five driving chip, each driving chip, video data is 24bit, the bit number of configuration data is 16bit.Then the external control data of controller output are: the video data of the video data+chip 5 of the video data+chip 4 of the video data+chip 3 of the video data+chip 2 of chip 1+configuration data.First driving chip will gulp down 24bit data as video data, read 16bit simultaneously and configure data, and residue 96bit video 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 video data+16bit to configure data, the like.If during the configuration data of the video data+16bit that external control data are 24bit of controller output, video data has not been had to 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, video data can be mistakenly considered by driving chip and gulp down display.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.

This utility model adds configuration data after video 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.This utility model 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 video 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.

Should be understood that; application of the present utility model 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 this utility model claims.

Claims (9)

1. the LED drive circuit of a configurable parameter, it is characterised in that including:
For exporting the controller of external control data, described external control data include series connection each LED drive chip needed for video data and one group for configuring the configuration data of the parameter of LED drive chip;
For detecting the data of input input, when input input external control data, extract self required video data and obtain configuration data, according to described video data and configuration data, controlling LED and show accordingly;And described external control data or the residue external control data after being extracted video data are exported to the LED drive chip of next stage LED drive chip;
The bit number of self required video data that described LED drive chip is extracted is different from the bit number of configuration data;
Described LED drive chip is provided with n, and n is the positive integer more than 1;N LED drive chip multi-stage LED in series drives, and the input of first order LED drive chip connects the outfan of controller.
The LED drive circuit of configurable parameter the most according to claim 1, it is characterised in that described LED drive chip includes:
For detecting the port detecting module of the data that the input of this grade of LED drive chip inputs;
For when the input of this grade of LED drive chip inputs external control data, video data needed for extracting this grade of LED drive chip also obtains the configuration data of parameter for configuring LED drive chip, and exports described external control data or the residue external control data after being extracted video data to the external control module of next stage LED drive chip;
For according to described video data and configuration data, controlling the PWM display module that LED lamp shows accordingly;
Described port detecting module connects the input of external control module, and the first outfan of described external control module connects PWM display module.
The LED drive circuit of configurable parameter the most according to claim 1, it is characterised in that after described configuration data are arranged on video data.
The LED drive circuit of configurable parameter the most according to claim 1, it is characterized in that, the parameter of described LED drive chip includes one or more in the electric current of LED drive chip, the brightness of LED, gamma value, PWM refresh rate and frame length control code, and described frame length control code is for arranging the bit number of the video data needed for this grade of LED drive chip.
The LED drive circuit of configurable parameter the most according to claim 1, it is characterised in that the bit number of described configuration data is less than the bit number of the video data needed for LED drive chip.
The LED drive circuit of configurable parameter the most according to claim 1, it is characterised in that when described configuration data are for configuring the parameter specifying LED drive chip, also include the address of this appointment LED drive chip.
The LED drive circuit of configurable parameter the most according to claim 2, it is characterized in that, LED drive chip also includes: for when the input of this grade of LED drive chip does not has data to input, from the video data of storage inside, extract the video data needed for this grade of LED drive chip, 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 video data of storage inside, the video data needed for this grade of LED drive chip is extracted from the video data of storage inside, and to the internal control coding/decoding module of next stage LED drive chip output synchronous code;
Described port detecting module connects the input of internal control coding/decoding module, and the first outfan of described internal control coding/decoding module connects PWM display module.
The LED drive circuit of configurable parameter the most according to claim 7, it is characterised in that described synchronous code does not comprise video data;The synchronous code that this grade of LED drive chip exports to next stage LED drive chip is corresponding with the video data needed for next stage LED drive chip.
The LED drive circuit of configurable parameter the most according to claim 7, it is characterized in that, described LED drive chip also includes: the data for the data exported by internal control coding/decoding module and/or the output of external control module carry out frequency and duty cycle correction, the data after correction is exported to the correction forwarding module of next stage LED drive chip by the outfan of LED drive chip;
Described port detecting module connects the first input end of correction forwarding module, second outfan of described external control module and the second outfan of internal control coding/decoding module connect the second input of correction forwarding module, and the outfan of described correction forwarding module connects the input of next stage LED drive chip.
CN201620517055.4U 2016-05-31 2016-05-31 A kind of LED drive circuit of configurable parameter CN205793511U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106898293A (en) * 2017-02-16 2017-06-27 深圳市奥拓电子股份有限公司 A kind of light-emitting diode display and its display brightness method of adjustment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106898293A (en) * 2017-02-16 2017-06-27 深圳市奥拓电子股份有限公司 A kind of light-emitting diode display and its display brightness method of adjustment

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