CN201185074Y - System for correcting LED dot array screen parameter - Google Patents
System for correcting LED dot array screen parameter Download PDFInfo
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- CN201185074Y CN201185074Y CNU2007201152134U CN200720115213U CN201185074Y CN 201185074 Y CN201185074 Y CN 201185074Y CN U2007201152134 U CNU2007201152134 U CN U2007201152134U CN 200720115213 U CN200720115213 U CN 200720115213U CN 201185074 Y CN201185074 Y CN 201185074Y
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Abstract
The utility model discloses a parameter correction system of an LED lattice screen, which consists of a main controller and a plurality of LED driving units, and is characterized in that the LED driving unit comprises a memory circuit, a memory controlling circuit and an LED driving circuit. When the parameter correction system of the LED lattice screen reads the correction parameters, the main controller controls the LED driving units and establishes a communication channel with the LED driving units; the main controller and each memory controlling circuit of the LED driving units read the lattice correction parameter that is memorized inside the memory circuit of the LED driving units; the main controller completes the calculation and comparison of the lattice correction parameters, and transmits the actual displaying value to the LED driving circuit of the LED driving units. The parameter correction system of the LED lattice screen adopts the unit-based design, and has flexibility, and can also transmits the data back to the main controller to be processed.
Description
Technical field
The utility model relates to the LED matrix screen parameter calibration system, specially refers to the system of the LED matrix screen parameter correction of adopting the blocking design.
Background technology
Along with the improvement of LED (light emitting diode) production technology level and the raising of luminescence efficiency, especially the appearance of red, green, blue high-brightness LED device, make the spectrum of LED device cover the scope of natural light, utilizing LED to make the dot matrix screen has become the key areas that LED uses.
The maximum difficult point that runs in the design of LED dot matrix screen is a consistency problem: on the one hand, because the deviation of manufacturing process, the LED dot matrix in the large scale LED screen is under same drive current, and individual display brightness is difference to some extent; On the other hand,, caused actual deviation of drive current, thereby caused LED dot matrix screen brightness irregularities, influenced the display quality of picture because the driving circuit components and parts of each several part LED dot matrix also there are differences.In order to overcome conforming offset issue between the LED dot matrix, adopt LED through screening, measures such as the modular structure of improvement driving circuit and screen field engineering are the comparison effective methods, but the also corresponding raising of cost.
The drive system of big LED dot matrix screen adopts the blocking design more, be about to whole dot matrix screen and be divided into some identical driver elements with driving circuit, each driver element comprises a part of LED dot matrix and corresponding driving circuit, all driver elements are controlled by a main control unit, form large-size screen monitors or module by main control unit and each driver element, form bigger LED display by a plurality of modules.The LED screen of blocking design, flexible increase and decrease driver element number or the module number of only needing get final product, and each driver element has good versatility, brings great convenience to making, installation, debugging and maintenance.If provide the point calibration parameter to each LED in the LED large-size screen monitors of blocking design, the method that just can make system pass through pointwise correction improves the brightness of screen and the homogeneity of colourity.
The point calibration method of present LED dot matrix screen mainly contains following two kinds:
As shown in Figure 1 a kind of, comprise primary controller and LED driver element and be independent of primary controller and the storer of LED driver element, the point calibration parameter of big LED dot matrix screen is left in the storer in advance, primary controller reads the correction parameter in the storer, computing obtains the displayed value of actual needs, send led drive circuit to, be presented on the LED dot matrix.The shortcoming that this point calibration method is applied to big LED dot matrix screen is: the point calibration parameter of write store must be corresponding one by one with the address of LED lattice block in system of each cascade in advance, in case increase or changed the LED lattice block of certain cascade, all correction parameters must be wiped and rewrite again in the storer, cause system flexibility poor; And, this system does not possess automatic error correcting capability, in the large-size screen monitors assembling process of reality, is easy to occur the assembling address of certain piece LED dot matrix and the not corresponding phenomenon in address of the interior correction parameter of storer, and system self can't find this mistake, causes more serious display defect thus.
Another kind as shown in Figure 2, read and the computing work of point calibration parameter are all finished by the LED driver element.Have microprocessor in the LED driver element and stored the storer of point calibration parameter.When primary controller sent idsplay order, the microprocessor of LED driver element read the point calibration parameter in the storer, and microprocessor carries out computing with the point calibration parameter with the idsplay order of receiving and obtains real output value, is presented on the LED dot matrix.The weak point of this method is: the microprocessor of driver element need carry out computing with every the idsplay order and the point calibration parameter of primary controller, in the big LED screen system big in the video data amount, that refresh rate is higher, the microprocessor of low side is often awkward to the point calibration work of treatment in the driver element.If in each driver element, adopt high-end microprocessors such as ARM, DSP, perhaps adopt programmable logic device (PLD) realization point calibration calculation process such as FPGA, for a big LED screen of being made up of hundreds of even several thousand LED driver elements, it is very expensive that its cost will become.In addition, publication number is that the patent of CN1427383 is mentioned in the LED driver element and removed microprocessor, directly point calibration parameter and value to be shown are carried out computing in comparator circuit, the display requirement that this bearing calibration only is applicable to is single-point or base point, low speed, very simple LED system, and its arithmetic speed and point calibration quality obviously can't satisfy large scale LED screen.
Summary of the invention
For addressing the above problem, the utility model aims to provide a kind of employing blocking design, has dirigibility, the LED matrix screen parameter calibration system that the data back master controller can be handled simultaneously.
A kind of LED matrix screen parameter calibration system, comprise a primary controller, the LED driver element (S1-SN) of several cascades, it is characterized in that described LED driver element comprises memory circuit, storage control circuit and led drive circuit, wherein, when the LED matrix screen parameter calibration system reads correction parameter, described primary controller is set up communication channel with the LED driver element point calibration parameter of the memory circuit stored of LED driver element is read primary controller by described communication channel, primary controller is finished the computing of point calibration parameter and is relatively worked, and the actual displayed value is sent to the led drive circuit of LED driver element.
Wherein, described LED driver element also can comprise data driver.
Wherein, described led drive circuit comprises shift register group.
Wherein, the communication channel that described primary controller is set up with the LED driver element is made of the shift register group cascade of LED driver elements at different levels, and the storage control circuit of primary controller and LED driver elements at different levels reads primary controller with the point calibration parameter of the memory circuitry stores of LED driver element by the communication channel that shift register group cascades at different levels constitute.
Wherein, the storage control circuit of described LED driver element comprises microprocessor and multichannel selecting arrangement.
Wherein, described memory circuit is non-volatile scratch pad memory.
Wherein, the control signal that described primary controller sends is undertaken exporting by control line Ctrl-A after signal strengthens by the data driver of control line Ctrl1 input first order LED driver element, and Ctrl-A is divided into two-way: one road Ctrl-A is as the control signal input Ctrl2 of second level LED driver element; One road Ctrl-A links to each other with microprocessor with the multichannel selecting arrangement of first order LED driver element respectively, thereby control microprocessor reads the point calibration parameter of storing in the storer of first order LED driver element, and control microprocessor sends order and data to the multichannel selecting arrangement.
Wherein, the control signal Ctrl-A that described i level LED driver element sends is connected to the control line Ctrl (i+1) of (i+1) level LED driver element, wherein i is 1 to arbitrary integer between (N-1), N equals the number of driver element, after the data driver of input (i+1) level LED driver element carries out the signal enhancing, export by control line Ctrl-A, Ctrl-A is divided into two-way: one road Ctrl-A is connected to the data driver of next stage LED driver element, another road Ctrl-A links to each other with microprocessor with the multichannel selecting arrangement of LED driver element at the corresponding levels respectively, thereby control microprocessor reads the point calibration parameter of storing in the LED driver element storer at the corresponding levels, and control microprocessor sends order and data to the multichannel selecting arrangement.
Wherein, at least one single data signal wire of described primary controller is connected to the multichannel selecting arrangement of first order LED driver element by data line Data1.
Wherein, the DOL Data Output Line Data (i+1) of the shift register group of described i level led drive circuit, wherein i is an arbitrary integer from 1 to N-1, N equals the number of driver element, has a multichannel selecting arrangement that is connected to next stage LED driver element at least.
Wherein, described microprocessor reads the interior point calibration parameter of storer of LED driver element at the corresponding levels, and the point calibration parameter is inputed to the multichannel selecting arrangement of LED driver element at the corresponding levels by data line Data-B.
Wherein, described microprocessor sends control signal, inputs to the multichannel selecting arrangement of LED driver element at the corresponding levels by control line Ctrl-B.
Wherein, described microprocessor sends control signal S control multichannel selecting arrangement.
Wherein, the multichannel selecting arrangement of described first order LED driver element (S1) is used to realize the switching of the microprocessor passage of the output channel of primary controller and LED driver element at the corresponding levels, that is: microprocessor is controlled the control end S of multichannel selecting arrangement, realize the control signal Ctrl-A of multichannel selecting arrangement gating data driver output at the corresponding levels and the data-signal Data1 passage of primary controller output, perhaps the control signal Ctrl-B and the data-signal Data-B passage of gating microprocessor output at the corresponding levels.
Wherein, described i level, wherein i is an arbitrary integer between 2 to N, N equals the number of driver element, the multichannel selecting arrangement of LED driver element is used to realize the switching of the microprocessor output channel of the data output channel of upper level LED driver element and LED driver element at the corresponding levels, that is: microprocessor is controlled the control end S of multichannel selecting arrangement, realize the control signal Ctrl-A of multichannel selecting arrangement gating data driver output at the corresponding levels and the data-signal Datai passage of upper level LED driver element output, wherein i is an arbitrary integer from 1 to N, N equals the number of driver element, perhaps the control signal Ctrl-B and the data-signal Data-B passage of gating microprocessor output at the corresponding levels.
Wherein, the data Data of described multichannel selecting arrangement output is fed through the shift register group in the led drive circuit at the corresponding levels; The control signal Ctrl of multichannel selecting arrangement output sends into led drive circuit at the corresponding levels.
Wherein, the data (as correction parameter) that receive of the shift register group in the described led drive circuit feed back to primary controller.
Wherein, described led drive circuit receives control signal Ctrl and data Data from the multichannel selecting arrangement, data Data is moved into the multichannel selecting arrangement of shift register group and next stage LED driver element; Have one in the DOL Data Output Line of the shift register of the driver element of afterbody at least and connect back primary controller.
Wherein, handshake (ACK) is sent in little processing of described each LED driver element, and one that can choose arbitrarily in the handshake (ACK) that described little processing sends is connected to primary controller.
Above-mentioned LED matrix screen parameter calibration system, correction parameter in each LED driver element must write on the described non-volatile memory medium in advance, its writing mode has number of ways: can system-wide correction parameter be write by the shift register group and the microprocessor path of each LED driver element, also can write, can also directly carry out erasable operation non-volatile media by the special purpose interface that microprocessor or non-volatile media carry.
Above-mentioned LED matrix screen parameter calibration system, by multiplexing Datai, wherein i is an arbitrary integer from 1 to N, N equals the number of driver element, shift register group passage with each LED driver element, can be operated in the LED display mode and read under two kinds of patterns of correction parameter: during display mode, primary controller sends video data to the interior shift register of each led drive circuit by the Datai of cascade, control output latch in each led drive circuit by Ctrli, video data is shown on the LED dot matrix through output driver; When reading the correction parameter pattern, it is described to be above summary of the invention.
Above-mentioned LED matrix screen parameter calibration system, because the figure place of the shift register group in each LED driver element is certain, and the relative position of each LED driver element in system is certain, by read the number of bits and the bit sequence of the point calibration parameter of primary controller from described data output feedback, not only corresponding one by one with each LED dot matrix position in system, and comprised the quantity information of the LED driver element of system's cascade.
For solving the problem of mentioning in the background technology, the utility model provides another LED matrix screen parameter calibration system, comprise a primary controller, the LED driver element (S1-SN) of several cascades, it is characterized in that described LED driver element comprises memory circuit, storage control circuit and led drive circuit, the point calibration parameter of the LED dot matrix of wherein said memory circuitry stores LED driver element at the corresponding levels.
Wherein, described LED driver element also can comprise data driver.
Wherein, when the LED matrix screen parameter calibration system reads correction parameter, described primary controller is set up communication channel with the LED driver element point calibration parameter of the memory circuit stored of LED driver element is read primary controller by described communication channel, primary controller is finished the computing of point calibration parameter and is relatively worked, and the actual displayed value is sent to the led drive circuit of LED driver element.
Wherein, described primary controller is set up communication channel with the LED driver element and constituted: primary controller is by data bus Data-Bi, wherein i is an arbitrary integer from 1 to N, N equals the number of driver element, distribute the address for each LED driver element of cascade, primary controller will read primary controller with the point calibration parameter in corresponding each memory circuit in address by data bus Data-C.
Wherein, the storage control circuit of described LED driver element comprises address distributing device.
Wherein, the address distributing device of described LED driver element is connected to the memory circuit of LED driver element at the corresponding levels, distributes its unique identification address coding in the LED sets of drive units to memory circuit at the corresponding levels.
Wherein, described primary controller is by data bus Data-Ai, wherein i is an arbitrary integer between 1 to N, N equals the number of driver element, cascade LED driver elements at different levels successively, by being connected to led drive circuit after the data driver enhancing signal intensity, led drive circuit receives the display command that primary controller sends.
Wherein, described primary controller is by data bus Data-Bi, wherein i is an arbitrary integer between 1 to N, N equals the number of driver element, be cascaded to LED driver elements at different levels successively, by being connected to the address distributing device of LED driver element at the corresponding levels after the data driver enhancing signal intensity, described address distributing device receives the address configuration instruction of primary controller transmission memory circuit is carried out address configuration.
Wherein, described primary controller connects the memory circuit of LED driver elements at different levels successively by data bus Data-C, primary controller sends the reading order that has address information by Data-C, the memory circuit of the LED driver element that the address conforms to responds reading order by Data-C, and the point calibration parameter of memory circuit stored is sent to primary controller by Data-C.
Based on first kind of LED matrix screen parameter calibration system, the utility model proposes the bearing calibration of LED matrix screen parameter calibration system, may further comprise the steps:
The S11 primary controller is by control line Ctrli, and wherein i is an arbitrary integer from 1 to N, and N equals the number of driver element, sends the order of reading the point calibration parameter to the microprocessor of LED driver elements at different levels;
After the microprocessor of each LED driver element of S12 receives orders, switch the multichannel selecting arrangement of this LED driver element, make the input data signal Data of shift register group of led drive circuit at the corresponding levels and data line Data-B and the control line Ctrl-B that input control signal Ctrl is communicated with microprocessor respectively, the microprocessor of LED driver elements at different levels reads the point calibration parameter in the storer of this LED driver element;
The microprocessor of S13 LED driver elements at different levels with the point calibration parameter that reads by the shift register group of data line Data-B in the multichannel selecting arrangement moves into the led drive circuit of LED driver element at the corresponding levels;
The microprocessor of S14 LED driver elements at different levels switches the multichannel selecting arrangement, make the input data signal Data of shift register group of led drive circuit and the output data line Datai that input control signal Ctrl is communicated with primary controller or upper level LED driver element respectively, wherein i is to arbitrary integer (N-1) from 1, N equals the number of driver element and the control line Ctrl-A of this LED driver element inside;
The microprocessor of S15LED driver element sends handshake ACK to primary controller;
The S16 primary controller is received ack signal, confirm that all microprocessors are all behind the completing steps S14, primary controller is by the output line Data of the multichannel selecting arrangement of each LED driver element, shift register group and the output data line Data (i+1) thereof in each led drive circuit, wherein i is from arbitrary integer 1 to N-1 integer, N equals the number of driver element, the passage of forming moves into the shift register group of next stage LED driver element with data, and the output line DataN of the shift register in afterbody LED driver element sends primary controller back to;
S17 repeating step S11-S16 is until finishing the predefined point calibration parameter command that reads.
Based on second kind of LED matrix screen parameter calibration system, the utility model proposes the bearing calibration of LED matrix screen parameter calibration system, may further comprise the steps:
The S21 primary controller distributes LED driver elements at different levels to encode in LED driver element unique identification address at the corresponding levels by data bus Data-Bi to the address distributing device of LED driver elements at different levels;
The S22 primary controller sends the order of reading the point calibration parameter by data bus Data-C to LED driver elements at different levels, comprises the geocoding of corresponding LED driver element in the order;
The LED driver element response primary controller that S23 is consistent with the geocoding in reading the point calibration parameter command sends to the point calibration parameter in this LED driver element memory circuit on the data bus Data-C;
The S24 primary controller receives the point calibration parameter from data bus Data-C;
S25 repeating step S21-S24 is until finishing the predefined point calibration parameter command that reads.
Compared with prior art, the utlity model has following advantage:
The first, large-size screen monitors LED is divided into plurality of small blocks and carries out point calibration, point calibration parameter and LED driver element combine, and have followed the principle of design of blocking, each LED structure of driving unit unanimity, have good versatility and extendability, safeguard with replacing for fabrication and installation to bring great convenience.
The second, the comparison of correction parameter and calculation process are finished by primary controller, have alleviated the burden of microprocessor in the LED driver element, and the microprocessor of low side is enough to reading and transmission work of competent point calibration parameter, has greatly reduced cost.Special in the large-size screen monitors of being made up of hundreds and thousands of LED driver elements, its economic benefit of bringing is particularly remarkable.
Three, the point calibration parameter that reads primary controller comprises the address information of LED driver element, primary controller is by refreshing and read the correction parameter of each LED driver element, can clear and definite each point correction parameter and the address corresponding relation of driver element, the correction parameter of realizing each LED dot matrix is corresponding one by one with pixel, thereby avoids taking place LED dot matrix actual address and the not corresponding mistake of point calibration parameter.
Four, the memory circuit of each LED driver element is deposited the point calibration parameter of each LED dot matrix of this driver element correspondence, and this point calibration parameter can first write store before the LED driver element dispatches from the factory, and also can write at the scene.Have erasable modification, repeated use, advantage simple to operation.
Description of drawings:
Fig. 1 is the system diagram of prior art 1
Fig. 2 is the system diagram of prior art 2
Fig. 3 is LED matrix screen parameter calibration system figure of the present utility model
Fig. 4 is one of first kind of LED matrix screen parameter calibration system of the present utility model
Fig. 5 is two of first kind of LED matrix screen parameter calibration system of the present utility model
Fig. 6 is second kind of LED matrix screen parameter calibration system figure of the present utility model
Embodiment
Below in conjunction with accompanying drawing, specify embodiment of the present utility model.
Fig. 3 is the structural representation of LED matrix screen parameter calibration system, the LED matrix screen parameter calibration system comprises the LED driver element S1-SN of a primary controller H1 and several cascades, described LED driver element S1-SN comprises memory circuit 21, storage control circuit 20 and led drive circuit 23, the point calibration parameter of wherein said memory circuit 21 storages LED driver element at the corresponding levels.
Wherein, described memory circuit 21 is a non-volatile memory, and its speciality is that power down does not disappear and can be erasable again, and described point calibration parameter is write by producer before the LED cell board dispatches from the factory, and can be wiped voluntarily and be rewritten by the user in actual applications.
Wherein, when the LED matrix screen parameter calibration system carries out parameter correction, described primary controller H1 sets up communication channel with LED driver element S1-SN the point calibration parameter of memory circuit 21 stored of LED driver element is read primary controller H1 by described communication channel, primary controller H1 finishes the computing of point calibration parameter and relatively works, and the actual displayed value is sent to the led drive circuit 23 of LED driver element S1-SN.
Wherein, described led drive circuit 23 links to each other with the LED dot matrix, and the displayed value that sends according to primary controller drives and light the LED dot matrix.
In real application systems, wherein, described LED driver element S1-SN can also comprise the data driver that is used to strengthen data-signal.
Wherein, described primary controller H1 set up communication channel with LED driver element S1-SN a kind of implementation as shown in Figure 4:
Wherein, the led drive circuit 23 of described LED driver element S1-SN comprises shift register group 231, described primary controller H1 is made of shift register group 231 cascades in the led drive circuit 23 of LED driver element S1-SN at different levels with the communication channel that LED driver element S1-SN sets up, and the storage control circuit 20 of described primary controller H1 and LED driver element S1-SN at different levels reads primary controller H1 with the point calibration parameter of memory circuit 21 storages of LED driver element by the communication channel that shift register group 231 cascades at different levels constitute.
Wherein, described memory circuit 21 can be non-volatile scratch pad memory.
Wherein, described storage control circuit 20 comprises microprocessor 201 and multichannel selecting arrangement 202.
Wherein, described led drive circuit 23 comprises shift register group 231, output latch 232 and output driver 233.
Comprise 4 bus: Ctrli in the LED matrix screen parameter calibration system shown in Figure 4, wherein i is an arbitrary integer from 1 to N, N equals the number of driver element, Datai, wherein i is an arbitrary integer from 1 to N, N equals the number of driver element, and Ctrl-B and Data-B below describe the connection and the effect of each road bus respectively:
Wherein, the control signal that described primary controller H1 sends is carried out the signal enhancing and outputed to LED driver element S2 inside by control line Ctrl-A by the data driver 22 of control line Ctrl1 input first order LED driver element S1, and Ctrl-A is divided into two-way: one road Ctrl-A connects the control signal input Ctrl2 of second level LED driver element S2; Another road Ctrl-A links to each other respectively with microprocessor 201 with the multichannel selecting arrangement 202 of first order LED driver element S1, thereby control microprocessor 201 reads the point calibration parameter of storage in the first order LED driver element S1 storer 21, and control microprocessor 201 sends order and data to multichannel selecting arrangement 202.
Wherein, the control signal Ctrl-A that described i level LED driver element Si sends is connected to the control line Ctrl (i+1) of (i+1) level LED driver element S (i+1), wherein i is 1 to arbitrary integer between (N-1), N equals the number of driver element, the data driver 22 of input (i+1) level LED driver element carries out signal and strengthens, the control signal Ctrl-A that exports through the data driver 22 of LED driver element S (i+1) is divided into two-way: one road Ctrl-A is connected to the data driver 22 of next stage LED driver element S (i+2), another road Ctrl-A links to each other with microprocessor 201 with the multichannel selecting arrangement 202 of LED driver element at the corresponding levels respectively, thereby control microprocessor 201 reads the point calibration parameter of storage in the LED driver element storer 21 at the corresponding levels, and control microprocessor 201 sends order and data to multichannel selecting arrangement 202.
Wherein, at least one single data signal wire of described primary controller H1 is connected to the multichannel selecting arrangement 202 of first order LED driver element S1 by data line Data1; The DOL Data Output Line Data (i+1) of the shift register group 231 of i level led drive circuit Si, wherein i is to arbitrary integer (N-1) from 1, N equals the number of driver element, has at least single line to be connected to the multichannel selecting arrangement 202 of next stage LED driver element.
Wherein, the microprocessor 201 of described each LED driver element S1-SN reads the point calibration parameter in the memory circuit 21 of LED driver element at the corresponding levels, and the point calibration parameter is inputed to the moving Dan Yuan Tinkling multichannel selecting arrangement 202 of LED Qu at the corresponding levels by data line Data-B.
Wherein, the microprocessor 201 of described each LED driver element S1-SN sends control signal, inputs to the multichannel selecting arrangement 202 of LED driver element at the corresponding levels by control line Ctrl-B.
Wherein, the microprocessor 201 of described each LED driver element S1-SN sends control signal S control multichannel selecting arrangement 202.When S is high level (low level), multichannel selecting arrangement 202 gating Ctrl-B, Data-B data channel, when S is low level (high level), then multichannel selecting arrangement 202 selects Ctrl-A, Datai data channel, wherein i is an arbitrary integer from 1 to N, N equals the number of driver element, realizes that by multichannel selecting arrangement 202 switching of Ctrl-B, Data-B and Ctrl-A, Datai is selected.
Wherein, the multichannel selecting arrangement 202 of described first order LED driver element S1 is used to realize that the switching of the microprocessor passage of the output channel of primary controller H1 and LED driver element S1 at the corresponding levels selects, that is: microprocessor 201 is controlled the control end S of multichannel selecting arrangements 202, realize the control signal Ctrl-B and the data-signal Data-B passage of 201 outputs of multichannel selecting arrangement 202 gating microprocessors, perhaps gating control signal Ctrl-A at the corresponding levels and data-signal Data1 passage.
Wherein, the multichannel selecting arrangement 202 of described i level (the 2nd grade of any one-level to the N level) LED driver element is used to realize that the switching of the microprocessor passage of the data output channel of upper level LED driver element and LED driver element at the corresponding levels selects, be that described multichannel selecting arrangement is by selecting control end S, realize the control signal Ctrl-B and the data letter signal Data-B passage of the microprocessor output of multichannel selecting arrangement gating LED driver element, perhaps gating Ctrl-A at the corresponding levels and Datai, wherein i is an arbitrary integer between 1 to N, and N equals the number passage of driver element.
Wherein, the data Data of the multichannel selecting arrangement 202 of described each LED driver element output is fed through the shift register group 231 in the led drive circuit 23 of LED driver element at the corresponding levels; The control signal Ctrl of multichannel selecting arrangement 202 outputs sends into led drive circuit 23 at the corresponding levels.
After the passage conversion, the shift register group 231 interior point calibration parameters that are admitted to led drive circuit at the corresponding levels can be by the multichannel selecting arrangement of next stage LED driver element, move in the shift register group of next stage LED driver element, and the like, the DOL Data Output Line of the shift register group of the LED driver element of one-level to the last, wherein i is an arbitrary integer from 1 to N-1, and N equals the number of driver element, in have at least one to connect back primary controller.
Wherein, the microprocessor 201 of described each LED driver element all can send handshake ACK, can choose any one handshake ACK and be connected to primary controller H1.
LED matrix screen parameter calibration system as shown in Figure 4, when the output data line of primary controller H1 is multiple signals line (as R, G, B three road signal wires), the concrete make of system as shown in Figure 5:
LED matrix screen parameter calibration system as shown in Figure 5, primary controller H1 outputting data signals line can also comprise Data1 ', wherein, the connected mode of described data line Data1 ' is: be connected to corresponding shift register 231 after strengthening by data driver 22, pass through in the data driver 22 that Data2 ' is connected to next stage LED driver element.
The data-signal Datai ' that described i level LED driver element sends is connected to the data line Data (i+1) ' of (i+1) level LED driver element, wherein i is 1 to arbitrary integer between (N-1), N equals the number of driver element, by being connected to corresponding shift register 231 after data driver 22 enhancings, by Data (i+1) ' be connected in the data driver 22 of next stage LED driver element.
LED matrix screen parameter calibration system as shown in Figure 5, Datai wherein, i is an arbitrary integer between 1 to N, N equals the number of driver element, removes the transmission that is used for the point calibration parameter, also can be used for transmitting R, G, BLED shows signal.
As Fig. 4 or the described LED matrix screen parameter calibration system of Fig. 5, correction parameter in each LED driver element must write on the described storer 21 in advance, its writing mode has number of ways: can system-wide correction parameter be write by the shift register group and the microprocessor path of each LED driver element, also can write, can also directly carry out erasable operation non-volatile media by the special purpose interface that microprocessor or non-volatile media carry.
As Fig. 4 or the described LED matrix screen parameter calibration system of Fig. 5, by multiplexing Datai, wherein i is an arbitrary integer from 1 to N, N equals the number of driver element, shift register group passage with each LED driver element, can be operated in the LED display mode and read under two kinds of patterns of correction parameter: during display mode, primary controller sends video data to the interior shift register of each led drive circuit by the Datai of cascade, pass through Ctrli, wherein i is from arbitrary integer 1 to N integer, N equals the number of driver element, controls the output latch in each led drive circuit, and video data is shown on the LED dot matrix through output driver; When reading the correction parameter pattern, be Fig. 4 or Fig. 5 utility model content is described.
As Fig. 4 or the described LED matrix screen parameter calibration system of Fig. 5, because the figure place of the shift register group in each LED driver element is certain, and the relative position of each LED driver element in system is certain, by read the number of bits and the bit sequence of the point calibration parameter of primary controller from described data output feedback, not only corresponding one by one with each LED dot matrix position in system, and comprised the quantity information of the LED driver element of system's cascade.
As Fig. 4 or LED matrix screen parameter calibration system shown in Figure 5, the bearing calibration of LED matrix screen parameter comprises following steps:
Step S11: the microprocessor power-up initializing of primary controller and LED driver element, the microprocessor of LED driver element are waited for and are received the primary controller order;
Step S12: primary controller sends the order of resetting to the microprocessor of each LED driver element;
The microprocessor of step S13:LED driver element is received corresponding initialization operations such as the order back resetting memory read data pointer of resetting, and beams back handshake ACK to primary controller then;
Step S14: primary controller is waited for the handshake ACK that the microprocessor of LED driver element is beamed back at T1 in the time, if primary controller is not received the handshake ACK that the microprocessor of LED driver element is beamed back at T1 in the time, then flow process finishes;
Step S15: primary controller is waited for T2 T1 receives the handshake ACK that the microprocessor of LED driver element beams back in the time after, to guarantee all intact operation responses of executed of each microprocessor;
Step S16: primary controller sends " read data " order to the microprocessor of LED driver element;
The microprocessor of step S17:LED driver element reads correction parameter from storer, and the pointer of read data is pointed to next address after receiving " read data " order; Control the S control end of multichannel selecting arrangement then, the microprocessor output control bus Ctrl-B and the data bus Data-B of multichannel selecting arrangement gating LED driver element, microprocessor will be proofreaied and correct supplemental characteristic by data line Data-B and move into shift register group; The S of microprocessor control multichannel selecting arrangement holds then, make the input data signal Data of shift register group of led drive circuit and the output data line Datai that input control signal Ctrl is communicated with primary controller (or upper level LED driver element) respectively, wherein i is an arbitrary integer between 1 to N-1, N equals the number of driver element and the control line Ctrl-A of this LED driver element inside.This moment, the shift register group level of each LED driver element connected together, and constituted the more shift register of a units, and microprocessor is beamed back handshake ACK to primary controller;
Step S18: primary controller is waited for the handshake ACK that the microprocessor of LED driver element is beamed back at T1 in the time, if primary controller is not received the handshake ACK that the microprocessor of LED driver element is beamed back at T1 in the time, then flow process finishes;
Step S19: primary controller is waited for the T2 time T1 receives the handshake ACK that the microprocessor of LED driver element beams back in the time after, finish " read data " with the microprocessor that guarantees all LED driver elements and order desired corresponding operating.Primary controller is by control bus Ctrli, wherein i is an arbitrary integer between 1 to N, N equals the number of driver element, control shift register group on each LED driver element with Ctrl-A, make correction parameter by data bus Datai, wherein i is an arbitrary integer between 1 to N, and N equals the number of driver element, the DOL Data Output Line DataN of the shift register group of Data, LED driver elements at different levels and afterbody LED driver element sends back to primary controller;
Step S20: repeating step S16-S19, until finishing the predefined point calibration parameter command that reads;
Another implementation of the communication channel that primary controller H1 described in the LED matrix screen parameter calibration system sets up with LED driver element S1-SN is as shown in Figure 6: primary controller is by data bus Data-Bi, wherein i is an arbitrary integer between 1 to N, N equals the number of driver element, distribute the address for each LED driver element of cascade, primary controller will read primary controller with the point calibration parameter in corresponding each memory circuit in address by data bus Data-C.
Wherein, described storage control circuit comprises address distributing device 201.
Wherein, described LED driver element also comprises the data driver 22 that is used to strengthen data signal strength.
Wherein, described memory circuit 21 has been stored the LED dot matrix 16 corresponding point calibration parameters that link to each other with the led drive circuit 23 of LED driver element at the corresponding levels.
Wherein, the address distributing device 201 in the storage control circuit 20 is connected to the memory circuit 21 of LED driver element at the corresponding levels, is used for being distributed in to memory circuit 21 at the corresponding levels the cascaded series uniquely identified address code of this LED matrix screen parameter calibration system.The specific implementation form of address code can be: use dial or keyswitch with the hardware mode configuration address; Also can cooperate, use plural shift register, but the perhaps ROM of storage address information, RAM, Flash, SD/MMC card perhaps can write the programming device configuration addresss such as FPGA, CPLD of address information by software.
The data bus of LED matrix screen parameter calibration system as shown in Figure 6 is divided three classes: the data bus Data-Ai that is used for each LED driver element of cascade, wherein i is an arbitrary integer between 1 to N, N equals the number of driver element, be used to transmit data bus Data-Bi to each LED driver element S1-SN addresses distributed, wherein i is an arbitrary integer between 1 to N, N equals the number of driver element and is used to read the data bus Data-C of the point calibration parameter in the memory circuit.
Data bus Data-A1 is connected to the data driver 22 of first order LED driver element S1 by primary controller H1, the output of data driver 22 is connected to the led drive circuit 23 of this LED driver element, Data-Ai, wherein i is an arbitrary integer between 1 to N, N equals the number of driver element, the input end of the output terminal of the led drive circuit 23 of connection upper level LED driver element Si and the data driver 22 of next stage LED driver element S (i+1).Data bus Data-Ai is used to transmit the display command that primary controller H1 sends to each LED driver element S1-SN.
Data bus Data-B1 is connected to the data driver 22 of first order LED driver element by primary controller H1, the output of data driver 22 is connected to the address distributing device 201 of LED driver element at the corresponding levels, Data-Bi, wherein i is an arbitrary integer between 1 to N, N equals the number of driver element, be connected to the input end of the data driver 22 of the output terminal of address distributing device 201 of upper level LED driver element Si and next stage LED driver element S (i+1).Data bus Data-Bi is used for primary controller H1 and sends the address configuration instruction to the address distributing device 201 of each LED driver element.
Data bus Data-C connects the memory circuit 21 of primary controller H1 and each LED driver element, be used to read the point calibration parameter in the memory circuit 21 of each LED driver element: primary controller H1 sends the reading order that has address information by data bus Data-C, the LED driver element that the address conforms to is by data bus Data-C response reading order, and the point calibration parameter of memory circuit 21 stored of LED driver element is sent to primary controller by data bus Data-C.
For the embodiment of second kind of concrete structure more specifically is described, LED matrix screen parameter calibration system among Fig. 6 adopts iic bus as data bus Data-C, adopt the IIC memory circuit as memory circuit 21, and adopt several shift register 2011 series connection as address distributing device 201.Data bus Data-Bi, wherein i is an arbitrary integer between 1 to N, N equals the number of driver element, forms by DI line and CLK line, data bus Data-C, promptly iic bus is made up of SDA and scl line.
Main control unit H1 is by data bus Data-Bi, DI line and CLK line, wherein i is an arbitrary integer between 1 to N, N equals the number of driver element, the configuration address order is sent to address distributing device 201, because address distributing device 201 is made up of several shift registers, all shift registers all have corresponding level value after a plurality of clock period, and the 3 bit shift register values of each LED driver element S1-SN are the address of this unit in cascaded series.
Primary controller H1 is by data bus Data-C, it is the iic bus among Fig. 6, it is the cooperation of SDA and SCL, the order of the point calibration parameter of LED driver element is read in transmission, the order of reading the point calibration parameter that the memory circuit 21 of each LED driver element receives on the iic bus, the LED driver element response primary controller H1 consistent with the geocoding of reading order sends to the point calibration parameter in the memory circuit 21 on the iic bus.The standard compliant IIC signal format of the digital signal of transmitting on the iic bus.
Adopt LED matrix screen parameter calibration system as shown in Figure 6, the bearing calibration of LED matrix screen parameter comprises following steps:
S21 disposes the IIC address of each driver element storer, and primary controller is by DI and CLK signal wire, and the IIC address date is moved into the shift register of each driver element, and everybody of shift register outputs to the address configuration end of memory circuit simultaneously;
The S22 primary controller is by iic bus, i.e. the cooperation of SDA and SCL sends the order of reading the point calibration parameter that comprises address code information;
The IIC memory circuit of each LED driver element of S23 receives and reads the point calibration parameter command on the iic bus, and the LED driver element response primary controller consistent with the geocoding of reading order sends to the point calibration parameter in the memory circuit on the iic bus;
The S24 primary controller receives the point calibration parameter from iic bus;
S25 repeating step S21-S24 is until finishing the predefined point calibration parameter command that reads.
What should be understood that is: the foregoing description is just to explanation of the present utility model, rather than to restriction of the present utility model, any innovation and creation that do not exceed in the utility model connotation scope all fall within the protection domain of the present utility model.
Claims (23)
1.LED matrix screen parameter calibration system, comprise a primary controller, the LED driver element S1-SN of several cascades, it is characterized in that described LED driver element comprises memory circuit, storage control circuit and led drive circuit, described primary controller is set up communication channel with the LED driver element point calibration parameter of the memory circuit stored of LED driver element is read primary controller by described communication channel, and primary controller sends the actual displayed value to the led drive circuit of LED driver element.
2. LED matrix screen parameter calibration system as claimed in claim 1 is characterized in that described LED driver element also can comprise data driver.
3. LED matrix screen parameter calibration system as claimed in claim 2 is characterized in that described led drive circuit comprises shift register group.
4. LED matrix screen parameter calibration system as claimed in claim 3, it is characterized in that the communication channel that described primary controller is set up with the LED driver element is made of shift register group cascade in the led drive circuit of LED driver elements at different levels, the storage control circuit of primary controller and LED driver elements at different levels reads primary controller with the point calibration parameter of the memory circuitry stores of LED driver element by the communication channel that shift register group cascades at different levels constitute.
5. LED matrix screen parameter calibration system as claimed in claim 4 is characterized in that the storage control circuit of described LED driver element comprises microprocessor and multichannel selecting arrangement.
6. LED matrix screen parameter calibration system as claimed in claim 4 is characterized in that described memory circuit can be non-volatile scratch pad memory.
7. LED matrix screen parameter calibration system as claimed in claim 5, it is characterized in that control signal that described primary controller the sends data driver by control line Ctrl1 input first order LED driver element carries out signal and strengthens the back by control line Ctrl-A output, Ctrl-A is divided into two-way: one road Ctrl-A is as the control signal input Ctrl2 of second level LED driver element; One road Ctrl-A links to each other with microprocessor with the multichannel selecting arrangement of first order LED driver element respectively, thereby control microprocessor reads the point calibration parameter of storing in the storer of first order LED driver element, and control microprocessor sends order and data to the multichannel selecting arrangement.
8. LED matrix screen parameter calibration system as claimed in claim 5, it is characterized in that control signal Ctrl-A that described i level LED driver element sends is connected to the control line Ctrl (i+1) of (i+1) level LED driver element, wherein i is 1 to arbitrary integer between (N-1), N equals the number of driver element, after the data driver of input (i+1) level LED driver element carries out the signal enhancing, export by control line Ctrl-A, Ctrl-A is divided into two-way: one road Ctrl-A is connected to the data driver of next stage LED driver element, another road Ctrl-A links to each other with microprocessor with the multichannel selecting arrangement of LED driver element at the corresponding levels respectively, thereby control microprocessor reads the point calibration parameter of storing in the LED driver element storer at the corresponding levels, and control microprocessor sends order and data to the multichannel selecting arrangement.
9. LED matrix screen parameter calibration system as claimed in claim 5 is characterized in that at least one single data signal wire of described primary controller is connected to the multichannel selecting arrangement of first order LED driver element by data line Data1.
10. LED matrix screen parameter calibration system as claimed in claim 5, the DOL Data Output Line Data (i+1) that it is characterized in that the shift register group of described i level led drive circuit, wherein i is to arbitrary integer (N-1) from 1, N equals the number of driver element, has at least single line to be connected to the multichannel selecting arrangement of next stage LED driver element.
11. LED matrix screen parameter calibration system as claimed in claim 5, it is characterized in that described microprocessor reads the interior point calibration parameter of storer of LED driver element at the corresponding levels, and the point calibration parameter is inputed to the multichannel selecting arrangement of LED driver element at the corresponding levels by data line Data-B.
12. LED matrix screen parameter calibration system as claimed in claim 5 is characterized in that described microprocessor sends control signal, inputs to the multichannel selecting arrangement of LED driver element at the corresponding levels by control line Ctrl-B.
13. LED matrix screen parameter calibration system as claimed in claim 5 is characterized in that described microprocessor sends control signal S control multichannel selecting arrangement.
14. LED matrix screen parameter calibration system as claimed in claim 5 is characterized in that the data Data of described multichannel selecting arrangement output is fed through the interior shift register group of led drive circuit at the corresponding levels; The control signal Ctrl of multichannel selecting arrangement output sends into led drive circuit at the corresponding levels.
15. LED matrix screen parameter calibration system as claimed in claim 4 is characterized in that the data that the shift register group in the described led drive circuit receives feed back to primary controller.
16. LED matrix screen parameter calibration system as claimed in claim 15, it is characterized in that described led drive circuit receives control signal Ctrl and data Data from the multichannel selecting arrangement, moves into data Data the multichannel selecting arrangement of shift register group and next stage LED driver element; Have one in the DOL Data Output Line of the shift register group of the driver element of afterbody at least and connect back primary controller.
17. LED matrix screen parameter calibration system as claimed in claim 5 is characterized in that handshake is sent in little processing of described each LED driver element, one that can choose arbitrarily in the handshake that described little processing sends is connected to primary controller.
18. LED matrix screen parameter calibration system as claimed in claim 2, it is characterized in that described primary controller sets up communication channel with the LED driver element and be made of following manner: primary controller is by data bus Data-Bi, wherein i is an arbitrary integer between 1 to N, N equals the number of driver element, distribute the address for each LED driver element of cascade, primary controller will read primary controller with the point calibration parameter in corresponding each memory circuit in address by data bus Data-C.
19. LED matrix screen parameter calibration system as claimed in claim 18 is characterized in that described storage control circuit comprises address distributing device.
20. LED matrix screen parameter calibration system as claimed in claim 19, it is characterized in that the address distributing device of described LED driver element is connected to the memory circuit of LED driver element at the corresponding levels, distribute its unique identification address coding in the LED sets of drive units to memory circuit at the corresponding levels.
21. LED matrix screen parameter calibration system as claimed in claim 18, it is characterized in that described primary controller is by data bus Data-Ai, wherein i is an arbitrary integer between 1 to N, N equals the number of driver element, cascade LED driver elements at different levels successively, LED driver elements at different levels are connected to led drive circuit after by data driver enhancing signal intensity, and led drive circuit receives the display command that primary controller sends.
22. LED matrix screen parameter calibration system as claimed in claim 18, it is characterized in that described primary controller is by data bus Data-Bi, wherein i is an arbitrary integer between 1 to N, N equals the number of driver element, be cascaded to LED driver elements at different levels successively, by being connected to the address distributing device of LED driver element at the corresponding levels after the data driver enhancing signal intensity, described address distributing device receives the address configuration instruction of primary controller transmission memory circuit is carried out address configuration.
23. LED matrix screen parameter calibration system as claimed in claim 18, it is characterized in that described primary controller connects the memory circuit of LED driver elements at different levels by data bus Data-C, primary controller sends the reading order that has address information by Data-C, the memory circuit of the LED driver element that the address conforms to responds reading order by Data-C, and the point calibration parameter of memory circuit stored is sent to primary controller by Data-C.
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| CNU2007201152134U CN201185074Y (en) | 2007-09-24 | 2007-09-24 | System for correcting LED dot array screen parameter |
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| CNU2007201152134U CN201185074Y (en) | 2007-09-24 | 2007-09-24 | System for correcting LED dot array screen parameter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101727830A (en) * | 2009-11-09 | 2010-06-09 | 北京巨数数字技术开发有限公司 | Led screen display system |
| CN103400550A (en) * | 2013-08-16 | 2013-11-20 | 西安诺瓦电子科技有限公司 | LED lamp panel, LED box body and LED display screen |
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| CN111210760A (en) * | 2018-08-24 | 2020-05-29 | 成都芯源系统有限公司 | Communication interface for LED array driving system |
| CN111210760B (en) * | 2018-08-24 | 2022-01-11 | 成都芯源系统有限公司 | Communication interface for LED array driving system |
| CN113035153A (en) * | 2019-12-06 | 2021-06-25 | 西安诺瓦星云科技股份有限公司 | Display screen information maintenance method, device and system |
| CN112162880A (en) * | 2020-09-30 | 2021-01-01 | 卡莱特（深圳）云科技有限公司 | Method and device for acquiring module correction coefficient applied to LED screen |
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