CN103943068A - Row scanning constant current drive chip for LED high-density display screen - Google Patents
Row scanning constant current drive chip for LED high-density display screen Download PDFInfo
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Abstract
The invention belongs to the technical field of LED display driving, and provides a row scanning constant current drive chip for an LED high-density display screen. A grey level data input module receives and transmits a plurality of grey level data to the next scanning constant drive chip according to digital clock signals, and meanwhile the grey level data are output to a data processing module; the data processing module stores a plurality of same level grey level data, scanning signals are output to scan a plurality of rows of LEDs in the LED high-density display screen row by row and output a plurality of corresponding LED switch signals to enable a constant current drive module to correspondingly drive the LEDs with different colors in each row in the LED high-density display screen to emit light, and the purpose that one row scanning constant current chip is used for conducting scanning switching and driving on multiple rows of LEDs is achieved. The number of chips can be better reduced, and the wiring difficulty of PCBs can be better lowered, and the display effect of the LED high-density display screen is better improved.
Description
Technical field
The invention belongs to LED display driver technical field, relate in particular to a kind of line scanning constant-current driven chip for LED high density display screen.
Background technology
In recent years, the development of LED display driver technology is also more and more higher to the requirement of LED display.In order to meet the demand of client to high-quality display effect, highly dense screen becomes the main product in market gradually, no matter is meeting-place or market, can see the application of more and more highly dense screens.Highly dense screen refers to and a kind ofly a plurality of LED, consists of, spacing between a plurality of LED is little, and the LED display that display frame is more smooth, fine and smooth, resolution is high, also can be described as LED high density display screen, it is mainly used in indoor and needs closely (to be generally less than two meters) and watch the application scenarios of display frame.
Although the LED spacing in highly dense screen is little, and can present gay colours and meticulous image quality, derivative problem is also comed one after another thus.In the middle of prior art, in the face of reducing of LED spacing, can make the lamp plate of LED display and the stray capacitance between LED change on the one hand, thereby cause serious motion blur phenomenon and poor low gray scale display effect; On the other hand, along with reducing of LED spacing, the area of LED display also can reduce thereupon, and in the situation that drive the quantity of chip constant, the highly dense screen that area is less cannot be used with the driving chip of traditional LED display equal number and drive to realize line scanning and constant current, and the little wiring difficulty of pcb board that also can make of area increases, and is unfavorable for cost-saving.Therefore, the LED display that prior art provides drives chip existence not to be suitable for LED high density display screen, and the problem that can make display effect variation and application cost increase.
Summary of the invention
The object of the present invention is to provide a kind of line scanning constant-current driven chip for LED high density display screen, the LED display that being intended to solve prior art provides drives the existing LED of the not being suitable for high density of chip display screen, and the problem that can make display effect variation and application cost increase.
The present invention realizes like this, a kind of line scanning constant-current driven chip for LED high density display screen, it comprises constant-current driven module, and described constant-current driven module carries out constant current driving according to LED switching signal output constant current control signal to the multirow LED in LED high density display screen;
Described line scanning constant-current driven chip also comprises gradation data load module and data processing module;
Gradation data input end and the data clock end of described gradation data load module access respectively a plurality of gradation datas and data clock signal, the described a plurality of gradation datas of data transfer output of described gradation data load module, the data output end of described gradation data load module connects the data input pin of described data processing module, the latch signal end of described data processing module and grayscale clock end be access data latch control signal and grayscale clock signal respectively, the output terminal of described data processing module connects the switching signal input end of described constant-current driven module, the row of described data processing module is swept output terminal output line scan signals,
Described gradation data load module receives described a plurality of gradation datas according to described data clock signal, and described a plurality of gradation datas are sent to the line scanning constant-current driven chip of next stage, and export described a plurality of gradation datas to described data processing module simultaneously; Described data processing module is stored the gradation data a plurality of at the corresponding levels in described a plurality of gradation datas according to described data latch control signal, and according to described a plurality of gradation datas and described grayscale clock signal output line scan signals, the multirow LED in LED high density display screen is implemented line by line line scanning and exports corresponding a plurality of LED switching signals to described constant-current driven module; Described constant-current driven module is correspondingly exported a plurality of constant current control signals according to described a plurality of LED switching signals and is driven the LED of the different colours that in described LED high density display screen, every a line LED comprises luminous.
The present invention comprises the line scanning constant-current driven chip for LED high density display screen of gradation data load module, data processing module and constant-current driven module by employing, by gradation data load module, according to data clock signal, receive a plurality of gradation datas, and the plurality of gradation data is sent to the line scanning constant-current driven chip of next stage, and export the plurality of gradation data to data processing module simultaneously; Data processing module is stored the gradation data a plurality of at the corresponding levels in a plurality of gradation datas according to data latch control signal, and according to a plurality of gradation datas and grayscale clock signal output line scan signals, the multirow LED in LED high density display screen is implemented line by line line scanning and exports corresponding a plurality of LED switching signals to constant-current driven module; The LED that constant-current driven module correspondingly exports according to a plurality of LED switching signals the different colours that in a plurality of constant current control signal driving LED high density display screens, every a line LED comprises is luminous, reached a line scanning constant-current driven chip multirow LED has been realized to the object that line scanning is switched and driven, the wiring difficulty that is conducive to reduce the quantity of chip and reduces pcb board, it is applicable in LED high density display screen, and contributes to improve the display effect of LED high density display screen.
Accompanying drawing explanation
Fig. 1 is the structural drawing of the line scanning constant-current driven chip for LED high density display screen that provides of the embodiment of the present invention;
Fig. 2 is the structural drawing of the line scanning constant-current driven chip for LED high density display screen that provides of first embodiment of the invention;
Fig. 3 is the cut-away view of the gradation data load module in the line scanning constant-current driven chip shown in Fig. 2;
Fig. 4 is the cut-away view of the data processing module in the line scanning constant-current driven chip shown in Fig. 2;
Fig. 5 is the structural drawing of the line scanning constant-current driven chip for LED high density display screen that provides of second embodiment of the invention;
Fig. 6 is the cut-away view of the gradation data load module in the line scanning constant-current driven chip shown in Fig. 5;
Fig. 7 is the cut-away view of the data processing module in the constant-current driven chip shown in Fig. 5.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 shows the structure of the line scanning constant-current driven chip for LED high density display screen that the embodiment of the present invention provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention, and details are as follows:
The line scanning constant-current driven chip for LED high density display screen that the embodiment of the present invention provides comprises constant-current driven module 100, constant-current driven module 100 carries out constant current driving according to LED switching signal output constant current control signal to the multirow LED in LED high density display screen, constant-current driven module 100 by its constant flow regulation port outer meeting resistance with regulating constant flow control signals the constant current value when the driving LED.
Line scanning constant-current driven chip also comprises gradation data load module 200 and data processing module 300.
The gradation data input end of gradation data load module 200 and data clock end DCLK access respectively a plurality of gradation datas and (at least comprise red-light LED gradation data, green light LED gradation data and blue-ray LED gradation data, the LED gradation data that also can comprise other colors, as white light LEDs gradation data) and data clock signal, the data transfer of gradation data load module 200 is exported above-mentioned a plurality of gradation datas, the data input pin of the data output end connection data processing module 300 of gradation data load module 200, the latch signal end LE of data processing module 300 and grayscale clock end GCLK be access data latch control signal and grayscale clock signal respectively, the output terminal OUT of data processing module 300 connects the switching signal input end of constant-current driven module 100, the row of described data processing module is swept output terminal L_OUT output line scan signals.
Gradation data load module 200 receives a plurality of gradation datas according to above-mentioned data clock signal, and a plurality of gradation datas is sent to the line scanning constant-current driven chip of next stage, and exports a plurality of gradation datas to data processing module 300 simultaneously; Data processing module 300 is stored the gradation data a plurality of at the corresponding levels in a plurality of gradation datas according to above-mentioned data latch control signal, and according to a plurality of gradation datas and above-mentioned grayscale clock signal output line scan signals, the multirow LED in LED high density display screen is implemented line by line line scanning and exports corresponding a plurality of LED switching signals to constant-current driven module 100; The LED that constant-current driven module 100 correspondingly exports according to above-mentioned a plurality of LED switching signals the different colours that in a plurality of constant current control signal driving LED high density display screens, every a line LED comprises is luminous.
Wherein, above-mentioned gradation data a plurality of at the corresponding levels refers in the received a plurality of gradation datas of gradation data load module 200 and is applicable to the needed gradation data of current constant-current driven chip, and it at least comprises ruddiness gradation data at the corresponding levels, green glow gradation data at the corresponding levels and blue light gradation data at the corresponding levels.
Every a line LED in LED high density display screen comprises a plurality of pixel cells, and each pixel cell at least comprises a red-light LED, a green light LED and a blue-ray LED.
The constant flow regulation port of constant-current driven module 100 at least comprises ruddiness constant flow regulation port, green glow constant flow regulation port and blue light constant flow regulation port, constant-current driven module 100 at least has a plurality of ruddiness constant current control ports, a plurality of green glow constant current control ports and a plurality of blue light constant current control port, and at least by a plurality of ruddiness constant current control ports, a plurality of green glow constant current control ports and a plurality of blue light constant current control port are exported respectively ruddiness constant current control signal, green glow constant current control signal and blue light constant current control signal are to red-light LED, green light LED and blue-ray LED carry out constant current driving.
The gradation data input end of gradation data load module 200 at least comprises ruddiness gradation data input end, green glow gradation data input end and blue light gradation data input end; The data transfer of gradation data load module 200 at least comprises ruddiness gradation data transmission end, green glow gradation data transmission end and blue light gradation data transmission end; The data output end of gradation data load module 200 at least comprises ruddiness gradation data output terminal, green glow gradation data output terminal and blue light gradation data output terminal; The data input pin of data processing module 200 at least comprises ruddiness gradation data input end, green glow gradation data input end and blue light gradation data input end.
Below in conjunction with specific embodiment, above-mentioned line scanning constant-current driven chip is elaborated:
embodiment mono-:
Fig. 2 shows the structure of the line scanning constant-current driven chip for LED high density display screen that first embodiment of the invention provides, every a line LED in LED high density display screen comprises a plurality of pixel cells, each pixel cell comprises a red-light LED, a green light LED and a blue-ray LED, for convenience of explanation, only show the part relevant to the present embodiment, details are as follows:
On the basis of the line scanning constant-current driven chip shown in Fig. 1, line scanning constant-current driven chip is implemented line scanning line by line to the multirow LED on LED high density display screen, and a plurality of pixel cells in every a line LED are carried out to constant current driving simultaneously, the constant flow regulation port of constant-current driven module 100 comprises ruddiness constant flow regulation port REXT_R, green glow constant flow regulation port REXT_G and blue light constant flow regulation port REXT_B, constant-current driven module 100 has a plurality of ruddiness constant current control ports (ROUT_0～ROUT_n), a plurality of green glow constant current control ports (GOUT_0～GOUT_n) and a plurality of blue light constant current control ports (BOUT_0～BOUT_n), and by a plurality of ruddiness constant current control ports (ROUT_0～ROUT_n), a plurality of green glow constant current control ports (GOUT_0～GOUT_n) and a plurality of blue light constant current control ports (BOUT_0～BOUT_n) are exported respectively ruddiness constant current control signal, green glow constant current control signal and blue light constant current control signal are to red-light LED, green light LED and blue-ray LED carry out constant current driving, each ruddiness constant current control port, green glow constant current control port and blue light constant current control port be a red-light LED of corresponding driving respectively, green light LED and blue-ray LED.
The gradation data input end of gradation data load module 200 comprises ruddiness gradation data input end DR, green glow gradation data input end DG and blue light gradation data input end DB; The data transfer of gradation data load module 200 comprises ruddiness gradation data transmission end DRO, green glow gradation data transmission end DRG and blue light gradation data transmission end DRB; The data output end of gradation data load module 200 comprises ruddiness gradation data output terminal D1, green glow gradation data output terminal D2 and blue light gradation data output terminal D3; The data input pin of data processing module 300 comprises ruddiness gradation data input end DI1, green glow gradation data input end DI2 and blue light gradation data input end DI3.
Wherein, the ruddiness gradation data input end DR of gradation data load module 200, green glow gradation data input end DG and blue light gradation data input end DB receive respectively red-light LED gradation data, green light LED gradation data and blue-ray LED gradation data, simultaneously, rising edge and/or negative edge at data clock signal, the ruddiness gradation data transmission end DRO of gradation data load module 200, green glow gradation data transmission end DGO and blue light gradation data transmission end DBO are respectively by red-light LED gradation data, green light LED gradation data and blue-ray LED gradation data are sent to the line scanning constant-current driven chip of next stage, and the ruddiness gradation data output terminal D1 of gradation data load module 200, green glow gradation data output terminal D2 and blue light gradation data output terminal D3 are respectively by red-light LED gradation data, green light LED gradation data and blue-ray LED gradation data export data processing module 300 to.
In an other situation, gradation data load module 200 can be only by ruddiness gradation data input end DR serial received red-light LED gradation data, green light LED gradation data and blue-ray LED gradation data, simultaneously, rising edge and/or negative edge at data clock signal, the blue light gradation data transmission end DBO of gradation data load module 200 is by red-light LED gradation data, green light LED gradation data and the serial transfer of blue-ray LED gradation data are to the line scanning constant-current driven chip of next stage, and the ruddiness gradation data output terminal of gradation data load module 200, green glow gradation data output terminal and blue light gradation data output terminal are respectively by red-light LED gradation data, green light LED gradation data and blue-ray LED gradation data export data processing module 300 to.
Further, as shown in Figure 3, gradation data load module 200 comprises:
The first gating unit 201, the second gating unit 202, the first shift register 203, the second shift register 204 and the 3rd shift register 205;
The data input pin of the first shift register 203, the first data input pin of the first data input pin of the first gating unit 201 and the second gating unit 202 is respectively the ruddiness gradation data input end DR of gradation data load module 200, green glow gradation data input end DG and blue light gradation data input end DB, the clock signal terminal of the first shift register 203, the common contact of the clock signal terminal of the clock signal terminal of the second shift register 204 and the 3rd shift register 205 is the clock signal terminal DCLK of gradation data load module 200, the first output terminal of the first shift register 203 connects the second data input pin of the first gating unit 201, the first output terminal of the second shift register 204 connects the second data input pin of the second gating unit 202, and the first output terminal of the first shift register 203, the first output terminal of the first output terminal of the second shift register 204 and the 3rd shift register 205 is respectively the ruddiness gradation data transmission end DRO of gradation data load module 200, green glow gradation data transmission end DGO and blue light gradation data transmission end DBO, the second output terminal of the first shift register 203, the second output terminal of the second output terminal of the second shift register 204 and the 3rd shift register 205 is respectively the ruddiness gradation data output terminal D1 of gradation data load module 200, green glow gradation data output terminal D2 and blue light gradation data output terminal D3, the output terminal of the output terminal of the first gating unit 201 and the second gating unit 202 is connected respectively the data input pin of the second shift register 204 and the data input pin of the 3rd shift register 205.
Wherein, the data input pin of the first shift register 203, the first data input pin of the first data input pin of the first gating unit 201 and the second gating unit 202 receives respectively red-light LED gradation data, green light LED gradation data and blue-ray LED gradation data, the second data input pin of the second data input pin of the first gating unit 201 and the second gating unit 202 is all closed, so rising edge and/or negative edge at data clock signal, the first gating unit 201 and the second gating unit 202 export green light LED gradation data and blue-ray LED gradation data to the second shift register 204 and the 3rd shift register 205 respectively, the first shift register 203, the second shift register 204 and the 3rd shift register 205 are respectively by red-light LED gradation data, green light LED gradation data and blue-ray LED gradation data send the line scanning constant-current driven chip of next stage to, and export data processing module 300 to simultaneously.
In another situation, the first data input pin of the first data input pin of the first gating unit 201 and the second gating unit 202 is all closed, the data input pin serial received red-light LED gradation data of the first shift register 203, green light LED gradation data and blue-ray LED gradation data, rising edge and/or negative edge at data clock signal, the first shift register 203 passes through its first output terminal by red-light LED gradation data, green light LED gradation data and blue-ray LED gradation data are passed to the first gating unit 201, the first gating unit 201 is by red-light LED gradation data, green light LED gradation data and blue-ray LED gradation data export the second shift register 204 to, the second shift register 204 passes through its first output terminal again by red-light LED gradation data, green light LED gradation data and blue-ray LED gradation data are passed to the second gating module 202, the second gating module 202 is by red-light LED gradation data, green light LED gradation data and blue-ray LED gradation data export the 3rd shift register 205 to, the first output terminal of the 3rd shift register 205 is by red-light LED gradation data, green light LED gradation data and blue-ray LED gradation data are sent to the line scanning constant-current driven chip of next stage, meanwhile, the second output terminal of the first shift register 203, the second output terminal of the second output terminal of the second shift register 204 and the 3rd shift register 205 is respectively by red-light LED gradation data, green light LED gradation data and blue-ray LED gradation data export data processing module 300 to.
For data processing module 300, as shown in Figure 2, the row of data processing module 300 is swept output terminal L_OUT and is comprised that a plurality of row sweep output terminal (L0～Ln), it is consistent with the line number of multirow LED in LED high density display screen that the plurality of row is swept the quantity of output terminal (L0～Ln), when carrying out line scanning, each row is swept after line scan signals that output terminal exports is controlled the first conducting of each pixel cell in every a line LED and is closed.
The red-light LED gradation data that data processing module 300 is exported gradation data load module 200 according to data latch control signal, ruddiness gradation data at the corresponding levels in green light LED gradation data and blue-ray LED gradation data, green glow gradation data at the corresponding levels and blue light gradation data at the corresponding levels are stored, and according to grayscale clock signal and ruddiness gradation data at the corresponding levels, green glow gradation data at the corresponding levels and blue light gradation data at the corresponding levels output line scan signals are implemented line scanning to LED high density display screen, also correspondingly export red-light LED switching signal simultaneously, green light LED switching signal and blue-ray LED switching signal are to constant-current driven module 100.
Further, as shown in Figure 4, data processing module 300 comprises storer 301, clock processing unit 302, pulse modulation unit 303, line scanning control module 304 and the shadow discharge cell 305 that disappears.
The first input end of storer 301, the second input end and the 3rd input end are respectively the ruddiness gradation data input end DI1 of data processing module 300, green glow gradation data input end DI2 and blue light gradation data input end DI3, and the first input end of storer 301, the second input end and the 3rd input end receive respectively red-light LED gradation data, green light LED gradation data and blue-ray LED gradation data, the control end of storer 301 is the latch signal end LE of data processing module 300, the output terminal of storer 301 connects the data input pin of pulse modulation unit 303, the input end of clock processing unit 302 is the grayscale clock end GCLK of data processing module 300, the first output terminal of clock processing unit 302 connects the input end of clock of pulse modulation unit 303, the output terminal of pulse modulation unit 303 is the output terminal OUT of data processing module 300, the second output terminal of clock processing unit 302 is connected with the input end of the input end of line scanning control module 304 and the shadow discharge cell 305 that disappears, a plurality of output terminals of line scanning control module 304 are respectively a plurality of row of data processing module 300 and sweep output terminal (L0～Ln), a plurality of output terminals of shadow discharge cell 305 of disappearing connect respectively a plurality of output terminals of line scanning control module 304 correspondingly.
Wherein, when data latch control signal effective (as Low level effective), storer 301 is by received red-light LED gradation data, ruddiness gradation data at the corresponding levels in green light LED gradation data and blue-ray LED gradation data, green glow gradation data at the corresponding levels and blue light gradation data at the corresponding levels are stored, 302 pairs of grayscale clock signals of clock processing unit carry out the output frequency modulation clock signal different from grayscale clock signal after frequency adjustment, pulse modulation unit 303 according to modulation clock signal to ruddiness gradation data at the corresponding levels, green glow gradation data at the corresponding levels and blue light gradation data at the corresponding levels carry out obtaining corresponding pulse-modulated signal after pulsed modulation processing and export constant-current driven module 100 to as LED switching signal, simultaneously, 303 pairs of grayscale clock signals of pulse modulation unit are counted, and sweep and control signal to line scanning control module 304 according to count value output row, line scanning control module 304 is swept control signal output line scan signals to the switching of lining by line scan of the multirow LED in LED high density display screen according to this row, in the process of lining by line scan, multirow LED in 304 pairs of LED high density display screens of line scanning control module adopts the mode of conducting line by line to scan.
During certain a line LED conducting in controlling LED high density display screen, the line scanning control module 304 output line scan signals corresponding with this row LED, and pulse modulation unit 303 can be exported the pulse-modulated signal corresponding with this row LED to constant-current driven module 100, constant-current driven module 100 is exported corresponding constant current control signal according to this pulse-modulated signal, line scan signals and constant current control signal are opened conducting to control this row LED jointly, and other each row LED all closes.In the finish time of controlling certain a line LED conducting, the parasitic capacitance discharge disappearing on 305 pairs of this row LED place lines of shadow discharge cell, eliminates to reach the object that lists smear.For example, LED line number in LED high density display screen is 16, data processing module 300 has 16 row and sweeps output terminal (L0～L15), from L0 to L15, successively the every a line LED LED high density display screen is implemented to line scanning, L0 output line scan signals and constant-current driven module 100 drove signal so that certain corresponding a line LED conducting according to above-mentioned pulse-modulated signal output constant current before this, when 302 pairs of grayscale clock signals of clock processing unit are counted, and count value is 1025 o'clock, L0 closes, L1 opens output line scan signals and constant current corresponding to constant-current driven module 100 outputs drives signal so that next line LED conducting, the rest may be inferred, from L0 to L15, circulate successively the every a line LED LED high density display screen is implemented to line scanning.
Because line scanning constant-current driven chip is red-light LED, green light LED and the blue-ray LED that will drive in a plurality of pixel cells simultaneously, so the quantity of the red-light LED that line scanning constant-current driven chip will drive is identical with the quantity of the quantity of green light LED and blue-ray LED, setting this quantity is herein a.The data bits of above-mentioned ruddiness gradation data at the corresponding levels is that n * a * m(n is data precision, as 16bits; M is the LED line number of LED high density display screen, as 4,8,16,32 etc.), in like manner, the data bits of green glow gradation data at the corresponding levels is n * a * m; The data bits of blue light gradation data at the corresponding levels is n * a * m.Wherein, owing to comprising red-light LED, green light LED and blue-ray LED in each pixel cell, i.e. the LED of three kinds of colors, so the total amount of data that data processing module 300 will be stored is n * a * m * 3.
Therefore, because data volume is larger, so storer 301 can be specifically SRAM(Static Random-Access Memory, static RAM).
For clock processing unit 302, it can be specifically conventional clock signal frequency regulating circuit.
For pulse modulation unit 303, it can be specifically conventional PWM controller.
embodiment bis-:
Fig. 5 shows the structure of the line scanning constant-current driven chip for LED high density display screen that second embodiment of the invention provides, every a line LED in LED high density display screen comprises a plurality of pixel cells, each pixel cell comprises a red-light LED, a green light LED, a blue-ray LED and a white light LEDs, for convenience of explanation, only show the part relevant to the present embodiment, details are as follows:
On the basis of the line scanning constant-current driven chip shown in Fig. 1, line scanning constant-current driven chip shown in Fig. 5 is implemented line scanning line by line to the multirow LED on LED high density display screen, and a plurality of pixel cells in every a line LED are carried out to constant current driving simultaneously, the constant flow regulation port of constant-current driven module 100 comprises ruddiness constant flow regulation port REXT_R, green glow constant flow regulation port REXT_G, blue light constant flow regulation port REXT_B and white light constant flow regulation port REXT_W, constant-current driven module 100 has a plurality of ruddiness constant current control ports (ROUT_0～ROUT_n), a plurality of green glow constant current control ports (GOUT_0～GOUT_n), a plurality of blue light constant current control ports (BOUT_0～BOUT_n) and a plurality of white light constant current control ports (WOUT_0～WOUT_n), and by a plurality of ruddiness constant current control ports (ROUT_0～ROUT_n), a plurality of green glow constant current control ports (GOUT_0～GOUT_n), a plurality of blue light constant current control ports (BOUT_0～BOUT_n) and a plurality of white light constant current control ports (WOUT_0～WOUT_n) are exported respectively ruddiness constant current control signal, green glow constant current control signal, blue light constant current control signal and white light constant current control signal are to red-light LED, green light LED, blue-ray LED and white light LEDs carry out constant current driving, each ruddiness constant current control port, green glow constant current control port, blue light constant current control port and white light constant current control port be a red-light LED of corresponding driving respectively, green light LED, blue-ray LED and white light LEDs.
The gradation data input end of gradation data load module 200 comprises ruddiness gradation data input end DR, green glow gradation data input end DG, blue light gradation data input end DB and white light gradation data input end DW; The data transfer of gradation data load module 200 comprises ruddiness gradation data transmission end DRO, green glow gradation data transmission end DRG, blue light gradation data transmission end DRB and white light gradation data transmission end DRW; The data output end of gradation data load module 200 comprises ruddiness gradation data output terminal D1, green glow gradation data output terminal D2, blue light gradation data output terminal D3 and white light gradation data output terminal D4; The data input pin of data processing module 300 comprises ruddiness gradation data input end DI1, green glow gradation data input end DI2, blue light gradation data input end DI3 and white light gradation data input end DI4.
From the above line scanning constant-current driven chip shown in Fig. 5, the function that the line scanning constant-current driven chip that the present embodiment provides both can have been realized the line scanning constant-current driven chip that first embodiment of the invention provides (drives red-light LED simultaneously, green light LED and blue-ray LED), also can drive red-light LED simultaneously, green light LED, blue-ray LED and white light LEDs, so, the line scanning constant-current driven chip that the present embodiment provides both can drive each pixel cell to comprise red-light LED for line scanning, the LED high density display screen of green light LED and blue-ray LED, also can drive each pixel cell to comprise red-light LED for line scanning, green light LED, the LED high density display screen of blue-ray LED and white light LEDs.Because driving the mode of the LED high density display screen that each pixel cell comprises red-light LED, green light LED and blue-ray LED, line scanning in first embodiment of the invention, mentions, so do not repeat them here.The mode that the LED high density display screen that only line scanning constant-current driven chip is comprised to red-light LED, green light LED, blue-ray LED and white light LEDs to each pixel cell is below implemented line scanning driving is elaborated.
Wherein, the ruddiness gradation data input end DR of gradation data load module 200, green glow gradation data input end DG, blue light gradation data input end DB and white light gradation data input end DW receive respectively red-light LED gradation data, green light LED gradation data, blue-ray LED gradation data and white light LEDs gradation data, meanwhile, at rising edge and/or the negative edge of data clock signal, the ruddiness gradation data transmission end DRO of gradation data load module 200, green glow gradation data transmission end DGO, blue light gradation data transmission end DBO and white light gradation data transmission end DWO are respectively by red-light LED gradation data, green light LED gradation data, blue-ray LED gradation data and white light LEDs gradation data are sent to the line scanning constant-current driven chip of next stage, and the ruddiness gradation data output terminal D1 of gradation data load module 200, green glow gradation data output terminal D2, blue light gradation data output terminal D3 and white light gradation data output terminal D4 are respectively by red-light LED gradation data, green light LED gradation data, blue-ray LED gradation data and white light LEDs gradation data export data processing module 300 to.
In another situation, gradation data load module 200 can be only by ruddiness gradation data input end DR serial received red-light LED gradation data, green light LED gradation data and blue-ray LED gradation data, simultaneously, rising edge and/or negative edge at data clock signal, the white light gradation data transmission end DWO of gradation data load module 200 is by red-light LED gradation data, green light LED gradation data, blue-ray LED gradation data and the serial transfer of white light LEDs gradation data are to the line scanning constant-current driven chip of next stage, and the ruddiness gradation data output terminal D1 of gradation data load module 200, green glow gradation data output terminal D2, blue light gradation data output terminal D3 and white light gradation data output terminal D4 are respectively by red-light LED gradation data, green light LED gradation data, blue-ray LED gradation data and white light LEDs gradation data export data processing module 300 to.
Further, as shown in Figure 6, gradation data load module 200 comprises:
The first gating unit 201, the second gating unit 202, the 3rd gating unit 203, the first shift register 204, the second shift register 205, the 3rd shift register 206 and the 4th shift register 207;
The data input pin of the first shift register 204, the first data input pin of the first gating unit 201, the first data input pin of the first data input pin of the second gating unit 202 and the 3rd gating unit 203 is respectively the ruddiness gradation data input end DR of gradation data load module 200, green glow gradation data input end DG, blue light gradation data input end DB and white light gradation data input end DW, the clock signal terminal of the clock signal terminal of the first shift register 204 and the second shift register 205, the common contact of the clock signal terminal of the clock signal terminal of the 3rd shift register 206 and the 4th shift register 207 is the clock signal terminal DCLK of gradation data load module 200, the first output terminal of the first shift register 204 connects the second data input pin of the first gating unit 201, the first output terminal of the second shift register 205 connects the second data input pin of the second gating unit 202, the first output terminal of the 3rd shift register 206 connects the second data input pin of the 3rd gating unit 203, and the first output terminal of the first shift register 204, the first output terminal of the second shift register 205, the first output terminal of the 3rd shift register 206 and the 4th shift register 207 are respectively the ruddiness gradation data transmission end DRO of gradation data load module 200, green glow gradation data transmission end DGO, blue light gradation data transmission end DBO and white light gradation data transmission end DWO, the second output terminal of the first shift register 204, the second output terminal of the second shift register 205, the second output terminal of the second output terminal of the 3rd shift register 206 and the 4th shift register 207 is respectively the ruddiness gradation data output terminal D1 of gradation data load module 200, green glow gradation data output terminal D2, blue light gradation data output terminal D3 and white light gradation data output terminal D4, the output terminal of the output terminal of the first gating unit 201 and the second gating unit 202 and the output terminal of the 3rd gating unit 203 are connected respectively the data input pin of the second shift register 205, the output terminal of the data input pin of the 3rd shift register 206 and the 4th shift register 207.
Wherein, the data input pin of the first shift register 204, the first data input pin of the first gating unit 201, the first data input pin of the first data input pin of the second gating unit 202 and the 3rd gating unit 203 receives respectively red-light LED gradation data, green light LED gradation data, blue-ray LED gradation data and white light LEDs gradation data, the second data input pin of the first gating unit 201, the second data input pin of the second data input pin of the second gating unit 202 and the 3rd gating unit 203 is all closed, so rising edge and/or negative edge at data clock signal, the first gating unit 201, the second gating unit 202 and the 3rd gating unit 203 are respectively by green light LED gradation data, blue-ray LED gradation data and white light LEDs gradation data export the second shift register 205 to, the 3rd shift register 206 and the 4th shift register 207, the first shift register 204, the second shift register 205, the 3rd shift register 206 and the 4th shift register 207 are respectively by red-light LED gradation data, green light LED gradation data, blue-ray LED gradation data and white light LEDs gradation data send the line scanning constant-current driven chip of next stage to, and export data processing module 300 to simultaneously.
In another situation, the first data input pin of the first gating unit 201, the first data input pin of the first data input pin of the second gating unit 202 and the 3rd gating unit 203 is all closed, the data input pin serial received red-light LED gradation data of the first shift register 204, green light LED gradation data, blue-ray LED gradation data and white light LEDs gradation data, rising edge and/or negative edge at data clock signal, the first shift register 204 passes through its first output terminal by red-light LED gradation data, green light LED gradation data, blue-ray LED gradation data and white light LEDs gradation data are passed to the first gating unit 201, the first gating unit 201 is by red-light LED gradation data, green light LED gradation data, blue-ray LED gradation data and white light LEDs gradation data export the second shift register 205 to, the second shift register 205 passes through its first output terminal again by red-light LED gradation data, green light LED gradation data and blue-ray LED gradation data and white light LEDs gradation data are passed to the second gating module 202, the second gating module 202 is by red-light LED gradation data, green light LED gradation data, blue-ray LED gradation data and white light LEDs gradation data export the 3rd shift register 206 to, the 3rd shift register 206 passes through its first output terminal by red-light LED gradation data, green light LED gradation data, blue-ray LED gradation data and white light LEDs gradation data are passed to the 3rd gating unit 203, the 3rd gating unit 203 is by red-light LED gradation data, green light LED gradation data, blue-ray LED gradation data and white light LEDs gradation data export the 4th shift register 207 to, the first output terminal of the 4th shift register 207 is by red-light LED gradation data, green light LED gradation data, blue-ray LED gradation data and the serial transfer of white light LEDs gradation data are to the line scanning constant-current driven chip of next stage, meanwhile, the second output terminal of the first shift register 204, the second output terminal of the second shift register 205, the second output terminal of the second output terminal of the 3rd shift register 206 and the 4th shift register 207 is respectively by red-light LED gradation data, green light LED gradation data, blue-ray LED gradation data and white light LEDs gradation data export data processing module 300 to.
For data processing module 300, as shown in Figure 5, the row of data processing module 300 is swept output terminal L_OUT and is comprised that a plurality of row sweep output terminal (L0～Ln), it is consistent with the line number of multirow LED in LED high density display screen that the plurality of row is swept the quantity of output terminal (L0～Ln), when carrying out line scanning, each row is swept after line scan signals that output terminal exports is controlled the first conducting of each pixel cell in every a line LED and is closed.
The red-light LED gradation data that data processing module 300 is exported gradation data load module 200 according to data latch control signal, green light LED gradation data, ruddiness gradation data at the corresponding levels in blue-ray LED gradation data and white light LEDs gradation data, green glow gradation data at the corresponding levels, blue light gradation data at the corresponding levels and white light gradation data at the corresponding levels are stored, and according to grayscale clock signal and ruddiness gradation data at the corresponding levels, green glow gradation data at the corresponding levels, blue light gradation data at the corresponding levels and white light gradation data at the corresponding levels output line scan signals are implemented line scanning to LED high density display screen, also correspondingly export red-light LED switching signal simultaneously, green light LED switching signal, blue-ray LED switching signal and white light LEDs switching signal are to constant-current driven module 100.
Further, as shown in Figure 7, data processing module 300 comprises storer 301, clock processing unit 302, pulse modulation unit 303, line scanning control module 304 and the shadow discharge cell 305 that disappears.
The first input end of storer 301, the second input end, the 3rd input end and four-input terminal are respectively the ruddiness gradation data input end DI1 of data processing module 300, green glow gradation data input end DI2, blue light gradation data input end DI3 and white light gradation data input end DI4, and the first input end of storer 301, the second input end, the 3rd input end and four-input terminal receive respectively red-light LED gradation data, green light LED gradation data, blue-ray LED gradation data and white light LEDs gradation data, the control end of storer 301 is the latch signal end LE of data processing module 300, the output terminal of storer 301 connects the data input pin of pulse modulation unit 303, the input end of clock processing unit 302 is the grayscale clock end GCLK of data processing module 300, the first output terminal of clock processing unit 302 connects the input end of clock of pulse modulation unit 303, the output terminal of pulse modulation unit 303 is the output terminal OUT of data processing module 300, the second output terminal of clock processing unit 302 is connected with the input end of the input end of line scanning control module 304 and the shadow discharge cell 305 that disappears, a plurality of output terminals of line scanning control module 304 are respectively a plurality of row of data processing module 300 and sweep output terminal (L0～Ln), a plurality of output terminals of shadow discharge cell 305 of disappearing connect respectively a plurality of output terminals of line scanning control module 304 correspondingly.
Wherein, when data latch control signal effective (as Low level effective), storer 301 is by received red-light LED gradation data, green light LED gradation data, ruddiness gradation data at the corresponding levels in blue-ray LED gradation data and white light LEDs gradation data, green glow gradation data at the corresponding levels, blue light gradation data at the corresponding levels and white light gradation data at the corresponding levels are stored, 302 pairs of grayscale clock signals of clock processing unit carry out the output frequency modulation clock signal different from grayscale clock signal after frequency adjustment, pulse modulation unit 303 according to modulation clock signal to ruddiness gradation data at the corresponding levels, green glow gradation data at the corresponding levels, blue light gradation data at the corresponding levels and white light gradation data at the corresponding levels carry out obtaining corresponding pulse-modulated signal after pulsed modulation processing and export constant-current driven module 100 to as LED switching signal, simultaneously, 303 pairs of grayscale clock signals of pulse modulation unit are counted, and sweep and control signal to line scanning control module 304 according to count value output row, line scanning control module 304 is swept control signal output line scan signals to the switching of lining by line scan of the multirow LED in LED high density display screen according to this row, in the process of lining by line scan, multirow LED in 304 pairs of LED high density display screens of line scanning control module adopts the mode of conducting line by line to scan.
During certain a line LED conducting in controlling LED high density display screen, the line scanning control module 304 output line scan signals corresponding with this row LED, and pulse modulation unit 303 can be exported the pulse-modulated signal corresponding with this row LED to constant-current driven module 100, constant-current driven module 100 is exported corresponding constant current control signal according to this pulse-modulated signal, line scan signals and constant current control signal are opened conducting to control this row LED jointly, and other each row LED all closes.In the finish time of controlling certain a line LED conducting, the parasitic capacitance discharge disappearing on 305 pairs of this row LED place lines of shadow discharge cell, eliminates to reach the object that lists smear.For example, LED line number in LED high density display screen is 16, data processing module 300 has 16 row and sweeps output terminal (L0～L15), from L0 to L15, successively the every a line LED LED high density display screen is implemented to line scanning, L0 output line scan signals and constant-current driven module 100 drove signal so that certain corresponding a line LED conducting according to above-mentioned pulse-modulated signal output constant current before this, when 302 pairs of grayscale clock signals of clock processing unit are counted, and count value is 1025 o'clock, L0 closes, L1 opens output line scan signals and constant current corresponding to constant-current driven module 100 outputs drives signal so that next line LED conducting, the rest may be inferred, from L0 to L15, circulate successively the every a line LED LED high density display screen is implemented to line scanning.
Because line scanning constant-current driven chip is red-light LED, green light LED, blue-ray LED and the white light LEDs that will drive in a plurality of pixel cells simultaneously, so the quantity of the red-light LED that line scanning constant-current driven chip will drive is identical with the quantity of the quantity of green light LED, blue-ray LED and the quantity of white light LEDs, setting this quantity is herein a.The data bits of above-mentioned ruddiness gradation data at the corresponding levels is that n * a * m(n is data precision, as 16bits; M is the LED line number of LED high density display screen, as 4,8,16,32 etc.), in like manner, the data bits of green glow gradation data at the corresponding levels is n * a * m; The data bits of blue light gradation data at the corresponding levels is n * a * m; The data bits of white light gradation data at the corresponding levels is n * a * m.Wherein, owing to comprising red-light LED, green light LED, blue-ray LED and white light LEDs in each pixel cell, i.e. the LED of four kinds of colors, so the total amount of data that data processing module 300 will be stored is n * a * m * 4.
Therefore, because data volume is larger, so storer 301 can be specifically SRAM.
For clock processing unit 302, it can be specifically conventional clock signal frequency regulating circuit.
For pulse modulation unit 303, it can be specifically conventional PWM controller.
In other embodiments of the invention, when if each pixel cell in the LED high density display screen of the required driving of line scanning constant-current driven chip also comprises the LED of other colors that are different from red-light LED, green light LED, blue-ray LED and white light LEDs, the quantity that can set the LED that comprises a plurality of different colours in pixel cell is b, and the total amount of data of the storer 301 required storages in first embodiment of the invention and the second embodiment is n * a * m * b.
The embodiment of the present invention comprises the line scanning constant-current driven chip for LED high density display screen of gradation data load module, data processing module and constant-current driven module by employing, by gradation data load module, according to data clock signal, receive a plurality of gradation datas, and the plurality of gradation data is sent to the line scanning constant-current driven chip of next stage, and export the plurality of gradation data to data processing module simultaneously; Data processing module is stored the gradation data a plurality of at the corresponding levels in a plurality of gradation datas according to data latch control signal, and according to a plurality of gradation datas and grayscale clock signal output line scan signals, the multirow LED in LED high density display screen is implemented line by line line scanning and exports corresponding a plurality of LED switching signals to constant-current driven module; The LED that constant-current driven module correspondingly exports according to a plurality of LED switching signals the different colours that in a plurality of constant current control signal driving LED high density display screens, every a line LED comprises is luminous, reached a line scanning constant-current driven chip multirow LED has been realized to the object that line scanning is switched and driven, the wiring difficulty that is conducive to reduce the quantity of chip and reduces pcb board, it is applicable in LED high density display screen, and contributes to improve the display effect of LED high density display screen.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. for a line scanning constant-current driven chip for LED high density display screen, comprise constant-current driven module, described constant-current driven module carries out constant current driving according to LED switching signal output constant current control signal to the multirow LED in LED high density display screen; It is characterized in that:
Described line scanning constant-current driven chip also comprises gradation data load module and data processing module;
Gradation data input end and the data clock end of described gradation data load module access respectively a plurality of gradation datas and data clock signal, the described a plurality of gradation datas of data transfer output of described gradation data load module, the data output end of described gradation data load module connects the data input pin of described data processing module, the latch signal end of described data processing module and grayscale clock end be access data latch control signal and grayscale clock signal respectively, the output terminal of described data processing module connects the switching signal input end of described constant-current driven module, the row of described data processing module is swept output terminal output line scan signals,
Described gradation data load module receives described a plurality of gradation datas according to described data clock signal, and described a plurality of gradation datas are sent to the line scanning constant-current driven chip of next stage, and export described a plurality of gradation datas to described data processing module simultaneously; Described data processing module is stored the gradation data a plurality of at the corresponding levels in described a plurality of gradation datas according to described data latch control signal, and according to described a plurality of gradation datas and described grayscale clock signal output line scan signals, the multirow LED in LED high density display screen is implemented line by line line scanning and exports corresponding a plurality of LED switching signals to described constant-current driven module; Described constant-current driven module is correspondingly exported a plurality of constant current control signals according to described a plurality of LED switching signals and is driven the LED of the different colours that in described LED high density display screen, every a line LED comprises luminous.
2. line scanning constant-current driven chip as claimed in claim 1, it is characterized in that, every a line LED in described LED high density display screen comprises a plurality of pixel cells, and described in each, pixel cell at least comprises a red-light LED, a green light LED and a blue-ray LED.
3. line scanning constant-current driven chip as claimed in claim 2, it is characterized in that, the constant flow regulation port of described constant-current driven module at least comprises ruddiness constant flow regulation port, green glow constant flow regulation port and blue light constant flow regulation port, described constant-current driven module at least has a plurality of ruddiness constant current control ports, a plurality of green glow constant current control ports and a plurality of blue light constant current control port, and at least by a plurality of described ruddiness constant current control ports, a plurality of described green glow constant current control ports and a plurality of described blue light constant current control port are exported respectively ruddiness constant current control signal, green glow constant current control signal and blue light constant current control signal are to red-light LED, green light LED and blue-ray LED carry out constant current driving,
The gradation data input end of described gradation data load module at least comprises ruddiness gradation data input end, green glow gradation data input end and blue light gradation data input end; The data transfer of described gradation data load module at least comprises ruddiness gradation data transmission end, green glow gradation data transmission end and blue light gradation data transmission end; The data output end of described gradation data load module at least comprises ruddiness gradation data output terminal, green glow gradation data output terminal and blue light gradation data output terminal; The data input pin of described data processing module at least comprises ruddiness gradation data input end, green glow gradation data input end and blue light gradation data input end.
4. line scanning constant-current driven chip as claimed in claim 3, it is characterized in that, the ruddiness gradation data input end of described gradation data load module, green glow gradation data input end and blue light gradation data input end receive respectively red-light LED gradation data, green light LED gradation data and blue-ray LED gradation data, simultaneously, rising edge and/or negative edge at described data clock signal, the ruddiness gradation data transmission end of described gradation data load module, green glow gradation data transmission end and blue light gradation data transmission end are respectively by described red-light LED gradation data, described green light LED gradation data and described blue-ray LED gradation data are sent to the line scanning constant-current driven chip of next stage, and the ruddiness gradation data output terminal of described gradation data load module, green glow gradation data output terminal and blue light gradation data output terminal are respectively by described red-light LED gradation data, described green light LED gradation data and described blue-ray LED gradation data export described data processing module to.
5. line scanning constant-current driven chip as claimed in claim 3, it is characterized in that, described gradation data load module is only by red-light LED gradation data described in ruddiness gradation data input end serial received, described green light LED gradation data and described blue-ray LED gradation data, simultaneously, rising edge and/or negative edge at described data clock signal, the blue light gradation data transmission end of described gradation data load module is by described red-light LED gradation data, described green light LED gradation data and the serial transfer of described blue-ray LED gradation data are to the line scanning constant-current driven chip of next stage, and the ruddiness gradation data output terminal of described gradation data load module, green glow gradation data output terminal and blue light gradation data output terminal are respectively by described red-light LED gradation data, described green light LED gradation data and described blue-ray LED gradation data export described data processing module to.
6. line scanning constant-current driven chip as claimed in claim 3, is characterized in that, described gradation data load module comprises:
The first gating unit, the second gating unit, the first shift register, the second shift register and the 3rd shift register;
The data input pin of described the first shift register, the first data input pin of described the first gating unit and the first data input pin of described the second gating unit are respectively the ruddiness gradation data input end of described gradation data load module, green glow gradation data input end and blue light gradation data input end, the clock signal terminal of described the first shift register, the common contact of the clock signal terminal of the clock signal terminal of described the second shift register and described the 3rd shift register is the clock signal terminal of described gradation data load module, the first output terminal of described the first shift register connects the second data input pin of described the first gating unit, the first output terminal of described the second shift register connects the second data input pin of described the second gating unit, and the first output terminal of described the first shift register, the first output terminal of the first output terminal of described the second shift register and described the 3rd shift register is respectively the ruddiness gradation data transmission end of described gradation data load module, green glow gradation data transmission end and blue light gradation data transmission end, the second output terminal of described the first shift register, the second output terminal of the second output terminal of described the second shift register and described the 3rd shift register is respectively the ruddiness gradation data output terminal of described gradation data load module, green glow gradation data output terminal and blue light gradation data output terminal, the output terminal of the output terminal of described the first gating unit and described the second gating unit is connected respectively the data input pin of described the second shift register and the data input pin of described the 3rd shift register.
7. line scanning constant-current driven chip as claimed in claim 3, it is characterized in that, the row of described data processing module is swept output terminal and is comprised that a plurality of row sweep output terminal, and it is consistent with the line number of multirow LED in described LED high density display screen that described a plurality of row are swept the quantity of output terminal;
Described data processing module comprises storer, clock processing unit, pulse modulation unit, line scanning control module and the shadow discharge cell that disappears;
The first input end of described storer, the second input end and the 3rd input end are respectively the ruddiness gradation data input end of described data processing module, green glow gradation data input end and blue light gradation data input end, and the first input end of described storer, the second input end and the 3rd input end receive respectively described red-light LED gradation data, described green light LED gradation data and described blue-ray LED gradation data, the control end of described storer is the latch signal end of described data processing module, the output terminal of described storer connects the data input pin of described pulse modulation unit, the input end of described clock processing unit is the grayscale clock end of described data processing module, the first output terminal of described clock processing unit connects the input end of clock of described pulse modulation unit, the output terminal of described pulse modulation unit is the output terminal of described data processing module, the second output terminal of described clock processing unit and the input end of described line scanning control module and described in the disappear input end of shadow discharge cell be connected, a plurality of output terminals of described line scanning control module are respectively a plurality of row of described data processing module and sweep output terminal, a plurality of output terminals of the described shadow discharge cell that disappears connect respectively a plurality of output terminals of described line scanning control module correspondingly.
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