CN203760052U - LED high-density display screen constant-current driving control chip - Google Patents
LED high-density display screen constant-current driving control chip Download PDFInfo
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Abstract
The utility model belongs to the technical field of LED display driving and provides an LED high-density display screen constant-current driving control chip. A grayscale data input module receives multiple grayscale data according to data clock signals, transmits the grayscale data to a constant-current driving control chip at the level and outputs the grayscale data to a data processing module at the same time; the data processing module latches the grayscale data at the current level according to data latching control signals and processes the grayscale data to be multiple corresponding LED switch signals to be output to a constant-current driving module; the constant-current driving module correspondingly outputs multiple constant-current control signals according to the LED switch signals to drive multiple LEDs different in color to emit light. A mode that one constant-current driving control chip drives the LEDs different in color is realized, so that reducing of the number of the constant-current driving control chips and lowering of PCB (printed circuit board) wiring are facilitated; the LED high-density display screen constant-current driving control chip is suitable for an LED high-density display screen, and display effect of the LED high-density display screen is improved.
Description
Technical field
The utility model belongs to LED display driver technical field, relates in particular to a kind of LED high density display screen constant current and drives control chip.
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 the driving chip with traditional LED display equal number, 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.
Utility model content
The purpose of this utility model is to provide a kind of LED high density display screen constant current to drive control chip, 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 utility model is to realize like this, a kind of constant current of LED high density display screen drives control chip, 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 LED in LED high density display screen;
Described constant current drives control chip also to comprise gradation data load module and data processing module;
Gradation data input end and the clock signal terminal 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 Enable Pin be access data latch control signal and enable signal respectively, and the output terminal of described data processing module connects the switching signal input end of described constant-current driven module;
Described gradation data load module receives described a plurality of gradation datas according to described data clock signal, and the constant current that described a plurality of gradation datas are sent to next stage is driven to control chip, and export described a plurality of gradation datas to described data processing module simultaneously, described data processing module latchs and is processed into corresponding a plurality of LED switching signal according to described data latch control signal to the gradation data a plurality of at the corresponding levels in described a plurality of gradation datas and exports described constant-current driven module to, 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 a plurality of different colours in described LED high density display screen luminous.
The utility model comprises gradation data load module by employing, the constant current for LED high density display screen of data processing module and constant-current driven module drives control chip, by gradation data load module, according to data clock signal, receive a plurality of gradation datas, and the constant current that the plurality of gradation data is sent to next stage is driven to control chip, and export the plurality of gradation data to data processing module simultaneously, data processing module latchs and is processed into corresponding a plurality of LED switching signal according to data latch control signal to the gradation data a plurality of at the corresponding levels in above-mentioned a plurality of gradation datas and exports constant-current driven module to, finally by constant-current driven module, according to described a plurality of LED switching signals, correspondingly exporting a plurality of constant current control signals drives the LED of a plurality of different colours luminous, having reached a constant current drives control chip to drive the object of the LED of a plurality of different colours, be conducive to reduce the wiring difficulty that constant current drives the quantity of control chip and reduces pcb board, it is applicable in LED high density display screen, and contribute to improve the display effect of LED high density display screen.
Accompanying drawing explanation
Fig. 1 is the structural drawing that the constant current of the LED high density display screen that provides of the utility model embodiment drives control chip;
Fig. 2 is the structural drawing that the constant current of the LED high density display screen that provides of the utility model the first embodiment drives control chip;
Fig. 3 is the cut-away view that the constant current shown in Fig. 2 drives the gradation data load module in control chip;
Fig. 4 is the cut-away view that the constant current shown in Fig. 2 drives the data processing module in control chip;
Fig. 5 is another cut-away view that the constant current shown in Fig. 2 drives the data processing module in control chip;
Fig. 6 is the structural drawing that the constant current of the LED high density display screen that provides of the utility model the second embodiment drives control chip;
Fig. 7 is the cut-away view that the constant current shown in Fig. 6 drives the gradation data load module in control chip;
Fig. 8 is the cut-away view that the constant current shown in Fig. 6 drives the data processing module in control chip;
Fig. 9 is another cut-away view that the constant current shown in Fig. 6 drives the data processing module in control chip.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
The constant current that Fig. 1 shows the LED high density display screen that the utility model embodiment provides drives the structure of control chip, for convenience of explanation, only shows the part relevant to the utility model embodiment, and details are as follows:
The constant current of the LED high density display screen that the utility model embodiment provides drives control chip to comprise 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 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.
Constant current drives control chip also to comprise gradation data load module 200 and data processing module 300.
The gradation data input end of gradation data load module 200 and clock signal terminal 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 and Enable Pin EN be access data latch control signal and enable signal respectively, the output terminal OUT of data processing module 300 connects the switching signal input end of constant-current driven module 100.
Gradation data load module 200 receives a plurality of gradation datas according to above-mentioned data clock signal, and the constant current that a plurality of gradation datas are sent to next stage is driven to control chip, and export a plurality of gradation datas to data processing module 300 simultaneously, data processing module 300 latchs and is processed into corresponding a plurality of LED switching signal according to above-mentioned data latch control signal to the gradation data a plurality of at the corresponding levels in a plurality of gradation datas and exports constant-current driven module 100 to, the LED that constant-current driven module 100 is correspondingly exported a plurality of different colours in a plurality of constant current control signal driving LED high density display screens according to above-mentioned a plurality of LED switching signals is luminous.
Wherein, above-mentioned gradation data a plurality of at the corresponding levels refers to that in the received a plurality of gradation datas of gradation data load module 200, being applicable to current constant current drives the needed gradation data of control 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.
Pixel cell in LED high density display screen 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 300 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, to above-mentioned constant current, drive control chip to be elaborated:
embodiment mono-:
The constant current that Fig. 2 shows the LED high density display screen that the utility model the first embodiment provides drives the structure of control chip, pixel cell in LED high density display screen 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:
In the constant current shown in Fig. 1, drive on the basis of control chip, constant current drives control chip to the red-light LED in a plurality of pixel cells on LED high density display screen, green light LED and blue-ray LED carry out 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.
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, the constant current that green light LED gradation data and blue-ray LED gradation data are sent to next stage drives control chip, 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 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 blue light gradation data transmission end 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 to the constant current of next stage drives control chip, 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, under the control of gating signal, 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, the constant current that green light LED gradation data and blue-ray LED gradation data send next stage to drives control chip, 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, the constant current that green light LED gradation data and blue-ray LED gradation data are sent to next stage drives control chip, 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, when enable signal is pulse signal, data processing module 300 latchs and correspondingly exports the LED of ruddiness unit switching signal, the LED of green glow unit switching signal and the LED of blue light unit switching signal to constant-current driven module 100 according to data latch control signal by turn by ruddiness gradation data at the corresponding levels, green glow gradation data at the corresponding levels and blue light gradation data at the corresponding levels in red-light LED gradation data, green light LED gradation data and the blue-ray LED gradation data of 200 outputs of gradation data load module.Respectively corresponding 1 the ruddiness gradation data at the corresponding levels of the LED of ruddiness unit switching signal, the LED of green glow unit switching signal and the LED of blue light unit switching signal of this place output, 1 green glow gradation data at the corresponding levels and 1 blue light gradation data at the corresponding levels.
Further, as shown in Figure 4, data processing module 300 comprises first memory 301 and gating unit 302, the control end of first memory 301 is the latch signal end LE of data processing module 300, the first input end of first memory 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 first memory 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 output terminal of first memory 301 connects the data input pin of gating unit 302, the control end of gating unit 302 and output terminal are respectively Enable Pin EN and the output terminal OUT of data processing module 300.
Wherein, when data latch control signal effective (as Low level effective), 1 ruddiness gradation data at the corresponding levels is only stored at every turn and exported to first memory 301, 1 green glow gradation data at the corresponding levels and 1 blue light gradation data at the corresponding levels, at enable signal, it is pulse signal, and during this pulse signal effective (as effective in high level), gating unit 302 is by 1 ruddiness gradation data at the corresponding levels, 1 green glow gradation data at the corresponding levels and 1 blue light gradation data at the corresponding levels are respectively as the above-mentioned LED of ruddiness unit switching signal, the LED of green glow unit switching signal and the LED of blue light unit switching signal are to constant-current driven module 100.
Because 301 of first memories are stored 1 red-light LED gradation data, 1 green light LED gradation data and 1 blue-ray LED gradation data, data volume is less, so first memory 301 can be specifically a plurality of latchs, forms.
When enable signal is clock signal, data processing module 300 carries out integral body according to data latch control signal by ruddiness gradation data at the corresponding levels, green glow gradation data at the corresponding levels and blue light gradation data at the corresponding levels in red-light LED gradation data, green light LED gradation data and the blue-ray LED gradation data of 200 outputs of gradation data load module and latchs and export corresponding red-light LED switching signal, green light LED switching signal and blue-ray LED switching signal to constant-current driven module 100.The respectively corresponding multidigit of red-light LED switching signal, green light LED switching signal and blue-ray LED switching signal ruddiness gradation data at the corresponding levels, multidigit green glow gradation data at the corresponding levels and the multidigit blue light gradation data at the corresponding levels of this place output.
Because constant current drives control chip, be red-light LED, green light LED and the blue-ray LED that will simultaneously drive in a plurality of pixel cells, so the quantity of red-light LED that constant current driving control 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.Above-mentioned multidigit red-light LED gradation data at the corresponding levels refers to the ruddiness gradation data at the corresponding levels in the red-light LED gradation data of gradation data load module 200 outputs, data bits can be that n * a(n is data precision, as 16bits) or n * a * m(m be the number of scanning lines of LED high density display screen, as 4,8,16,32 etc.), in like manner, multidigit green glow gradation data at the corresponding levels refers to the green glow gradation data at the corresponding levels in the green light LED gradation data of gradation data load module 200 outputs, and data bits can be n * a or n * a * m; Multidigit blue light gradation data at the corresponding levels refers to the blue light gradation data at the corresponding levels in the blue-ray LED gradation data of gradation data load module 200 outputs, and data bits can be n * a or 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 * 3 or n * a * m * 3.
Further, as shown in Figure 5, data processing module 300 comprises second memory 310, clock processing unit 320 and pulse modulation unit 330, the control end of second memory 310 is the latch signal end LE of data processing module, the first input end of second memory 310, 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 second memory 310, 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 input end of clock processing unit 320 is the Enable Pin EN of data processing module 300, the data input pin of pulse modulation unit 330 is connected respectively the output terminal of second memory 310 and the output terminal of clock processing unit 320 with input end of clock, the output terminal of pulse modulation unit 330 is the output terminal OUT of data processing module 300.
Wherein, when data latch control signal effective (as effective in high level), second memory 310 is by the red-light LED gradation data of gradation data load module 200 outputs, ruddiness gradation data at the corresponding levels in green light LED gradation data and blue-ray LED gradation data, pulse modulation unit 330 is stored and exported to green glow gradation data at the corresponding levels and blue light gradation data at the corresponding levels, because enable signal is clock signal, clock processing unit 320 carries out the output frequency modulation clock signal different from above-mentioned clock signal after frequency adjustment by above-mentioned clock signal, again by pulse modulation unit 330 according to this 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 exporting corresponding pulse-modulated signal after pulsed modulation is processed and export constant-current driven module 100 to as LED switching signal.
For second memory 310, when the total amount of data of needs storage is n * a * 3, it specifically can be comprised of a plurality of latchs; When the total amount of data of needs storage is n * a * m * 3, because data volume is larger, so second memory 310 can be specifically SRAM(Static Random-Access Memory, static RAM).
For clock processing unit 320, it can be specifically conventional clock signal frequency regulating circuit.
For pulse modulation unit 330, it can be specifically conventional PWM controller.
embodiment bis-:
The constant current that Fig. 6 shows the LED high density display screen that the utility model the second embodiment provides drives the structure of control chip, each pixel cell in LED high density display screen 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:
In the constant current shown in Fig. 1, drive on the basis of control chip, constant current shown in Fig. 6 drives control chip to the red-light LED in a plurality of pixel cells on LED high density display screen, green light LED, blue-ray LED and white light LEDs carry out 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.
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-mentioned constant current shown in Fig. 6, drive control chip, the constant current that the constant current that the present embodiment provides drives control chip both can realize the utility model the first embodiment to be provided drives the function of control chip (to drive 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 constant current driving control chip that the present embodiment provides both can be for having driven each pixel cell to comprise red-light LED, the LED high density display screen of green light LED and blue-ray LED, also can be for driving each pixel cell to comprise red-light LED, green light LED, the LED high density display screen of blue-ray LED and white light LEDs.Because the mode of the LED high density display screen that drives each pixel cell to comprise red-light LED, green light LED and blue-ray LED is mentioned in the utility model the first embodiment, so do not repeat them here.Only to constant current, drive control chip to drive the mode of the LED high density display screen that each pixel cell comprises red-light LED, green light LED, blue-ray LED and white light LEDs to be elaborated below.
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, the constant current that blue-ray LED gradation data and white light LEDs gradation data are sent to next stage drives control chip, 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 to the constant current of next stage drives control chip, 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 7, 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 at rising edge and/or the negative edge of 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, the constant current that blue-ray LED gradation data and white light LEDs gradation data send next stage to drives control chip, and exports 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 to the constant current of next stage drives control chip, 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, when enable signal is pulse signal, 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 latch and correspondingly export the LED of ruddiness unit switching signal by turn, the LED of green glow unit switching signal, the LED of blue light unit switching signal and the LED of white light unit switching signal are to constant-current driven module 100.Respectively corresponding 1 the ruddiness gradation data at the corresponding levels of the LED of ruddiness unit switching signal, the LED of green glow unit switching signal, the LED of blue light unit switching signal and the LED of white light unit switching signal of this place output, 1 green glow gradation data at the corresponding levels, 1 blue light gradation data at the corresponding levels and 1 white light gradation data at the corresponding levels.
Further, as shown in Figure 8, data processing module 300 comprises first memory 301 and gating unit 302, the control end of first memory 301 is the latch signal end LE of data processing module, the first input end of first memory 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 first memory 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 output terminal of first memory 301 connects the data input pin of gating unit 302, the control end of gating unit 302 and output terminal are respectively Enable Pin EN and the output terminal OUT of data processing module 300.
Wherein, when data latch control signal effective (as Low level effective), 1 ruddiness gradation data at the corresponding levels is only stored at every turn and exported to first memory 301, 1 green glow gradation data at the corresponding levels, 1 blue light gradation data at the corresponding levels and 1 white light gradation data at the corresponding levels, at enable signal, it is pulse signal, and during this pulse signal effective (as effective in high level), gating unit 302 is by 1 ruddiness gradation data at the corresponding levels, 1 green glow gradation data at the corresponding levels, 1 blue light gradation data at the corresponding levels and 1 white light gradation data at the corresponding levels are respectively as the above-mentioned LED of ruddiness unit switching signal, the LED of green glow unit switching signal, the LED of blue light unit switching signal and the LED of white light unit switching signal are to constant-current driven module 100.
Because 301 of first memories are stored 1 ruddiness gradation data at the corresponding levels, 1 green glow gradation data at the corresponding levels, 1 blue light gradation data at the corresponding levels and 1 white light gradation data at the corresponding levels, data volume is less, so first memory 301 specifically can be comprised of a plurality of latchs.
When enable signal is clock signal, data processing module 300 carries out integral body according to data latch control signal by 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 in red-light LED gradation data, green light LED gradation data, blue-ray LED gradation data and the white light LEDs gradation data of 200 outputs of gradation data load module and latchs and export corresponding red-light LED switching signal, green light LED switching signal, blue-ray LED switching signal and white light LEDs switching signal to constant-current driven module 100.The respectively corresponding multidigit of red-light LED switching signal, green light LED switching signal, blue-ray LED switching signal and white light LEDs switching signal ruddiness gradation data at the corresponding levels, multidigit green glow gradation data at the corresponding levels, multidigit blue light gradation data at the corresponding levels and the multidigit white light gradation data at the corresponding levels of this place output.
Because constant current drives control chip, be red-light LED, green light LED, blue-ray LED and the white light LEDs that will simultaneously drive in a plurality of pixel cells, so the quantity of red-light LED that constant current driving control chip will drive is identical with the quantity of the quantity of green light LED, blue-ray LED and white light LEDs, setting this quantity is herein a.Above-mentioned multidigit ruddiness gradation data at the corresponding levels refers to the ruddiness gradation data at the corresponding levels in the red-light LED gradation data DR of gradation data load module 200 outputs, data bits can be that n * a(n is data precision, as 16bits) or n * a * m(m be the number of scanning lines of LED high density display screen, as 4,8,16,32 etc.), in like manner, multidigit green glow gradation data at the corresponding levels refers to the green glow gradation data at the corresponding levels in the green light LED gradation data of gradation data load module 200 outputs, and data bits can be n * a or n * a * m; Multidigit blue light gradation data at the corresponding levels refers to the blue light gradation data at the corresponding levels in the blue-ray LED gradation data of gradation data load module 200 outputs, and data bits can be n * a or n * a * m; Multidigit white light gradation data at the corresponding levels refers to the white light gradation data at the corresponding levels in the white light LEDs gradation data of gradation data load module 200 outputs, and data bits can be n * a or 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 * 4 or n * a * m * 4.
Further, as shown in Figure 9, data processing module 300 comprises second memory 310, clock processing unit 320 and pulse modulation unit 330, the control end of second memory 310 is the latch signal end LE of data processing module, the first input end of second memory 310, 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 second memory 310, 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 input end of clock processing unit 320 is the Enable Pin EN of data processing module 300, the data input pin of pulse modulation unit 330 is connected respectively the output terminal of second memory 310 and the output terminal of clock processing unit 320 with input end of clock, the output terminal of pulse modulation unit 330 is the output terminal OUT of data processing module 300.
Wherein, when data latch control signal effective (as effective in high level), second memory 310 is by the red-light LED gradation data of gradation data load module 200 outputs, 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, pulse modulation unit 330 is stored and exported to blue light gradation data at the corresponding levels and white light gradation data at the corresponding levels, because enable signal is clock signal, clock processing unit 320 carries out the output frequency modulation clock signal different from above-mentioned clock signal after frequency adjustment by above-mentioned clock signal, again by pulse modulation unit 330 according to this 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 exporting corresponding pulse-modulated signal after pulsed modulation is processed and export constant-current driven module 100 to as LED switching signal.
For second memory 310, when the total amount of data of needs storage is n * a * 4, it specifically can be comprised of a plurality of latchs; When the total amount of data of needs storage is n * a * m * 4, because data volume is larger, so second memory 310 can be specifically SRAM(Static Random-Access Memory, static RAM).
For clock processing unit 320, it can be specifically conventional clock signal frequency regulating circuit.
For pulse modulation unit 330, it can be specifically conventional PWM controller.
In other embodiment of the utility model, if each pixel cell in the LED high density display screen of the required driving of constant current driving control 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 second memory 310 required storages in the utility model the first embodiment and the second embodiment is n * a * b or n * a * m * b.
The utility model embodiment comprises gradation data load module by employing, the constant current for LED high density display screen of data processing module and constant-current driven module drives control chip, by gradation data load module, according to data clock signal, receive a plurality of gradation datas, and the constant current that the plurality of gradation data is sent to next stage is driven to control chip, and export the plurality of gradation data to data processing module simultaneously, data processing module latchs and is processed into corresponding a plurality of LED switching signal according to data latch control signal to the gradation data a plurality of at the corresponding levels in above-mentioned a plurality of gradation datas and exports constant-current driven module to, finally by constant-current driven module, according to described a plurality of LED switching signals, correspondingly exporting a plurality of constant current control signals drives the LED of a plurality of different colours luminous, having reached a constant current drives control chip to drive the object of the LED of a plurality of different colours, be conducive to reduce the wiring difficulty that constant current drives the quantity of control chip and reduces pcb board, it is applicable in LED high density display screen, and contribute to improve the display effect of LED high density display screen.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.
Claims (6)
1. for the constant current of LED high density display screen, drive a control chip, 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 LED in LED high density display screen; It is characterized in that, described constant current drives control chip also to comprise gradation data load module and data processing module;
Gradation data input end and the clock signal terminal 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 Enable Pin be access data latch control signal and enable signal respectively, and the output terminal of described data processing module connects the switching signal input end of described constant-current driven module;
Described gradation data load module receives described a plurality of gradation datas according to described data clock signal, and the constant current that described a plurality of gradation datas are sent to next stage is driven to control chip, and export described a plurality of gradation datas to described data processing module simultaneously, described data processing module latchs and is processed into corresponding a plurality of LED switching signal according to described data latch control signal to the gradation data a plurality of at the corresponding levels in described a plurality of gradation datas and exports described constant-current driven module to, 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 a plurality of different colours in described LED high density display screen luminous.
2. constant current as claimed in claim 1 drives control chip, it is characterized in that, each pixel cell in described LED high density display screen at least comprises a red-light LED, a green light LED and a blue-ray LED.
3. constant current as claimed in claim 2 drives control chip, 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 described a plurality of ruddiness constant current control ports, described a plurality of green glow constant current control port and described 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 described red-light LED, described green light LED and described 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. constant current as claimed in claim 3 drives control chip, it 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.
5. constant current as claimed in claim 3 drives control chip, it is characterized in that,
Described data processing module comprises first memory and gating unit, the control end of described first memory is the latch signal end of described data processing module, the first input end of described first memory, 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 first memory, 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 output terminal of described first memory connects the data input pin of described gating unit, the control end of described gating unit and output terminal are respectively Enable Pin and the output terminal of described data processing module.
6. constant current as claimed in claim 3 drives control chip, it is characterized in that,
Described data processing module comprises second memory, clock processing unit and pulse modulation unit, the control end of described second memory is the latch signal end of described data processing module, the first input end of described second memory, 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 second memory, 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 input end of described clock processing unit is the Enable Pin of described data processing module, the data input pin of described pulse modulation unit is connected respectively the output terminal of described second memory and the output terminal of described clock processing unit with input end of clock, the output terminal of described pulse modulation unit is the output terminal of described data processing module.
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