CN103280184A - Dynamic scanning device of energy-saving LED screen, energy-saving LED screen and dynamic scanning method - Google Patents
Dynamic scanning device of energy-saving LED screen, energy-saving LED screen and dynamic scanning method Download PDFInfo
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- CN103280184A CN103280184A CN201310217711XA CN201310217711A CN103280184A CN 103280184 A CN103280184 A CN 103280184A CN 201310217711X A CN201310217711X A CN 201310217711XA CN 201310217711 A CN201310217711 A CN 201310217711A CN 103280184 A CN103280184 A CN 103280184A
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Abstract
The invention provides a dynamic scanning device of an energy-saving LED screen, the energy-saving LED screen and a dynamic scanning method. The energy-saving LED screen comprises a control module, a power source module, a switch module, an LED array and a constant current source set, wherein the control module is used for outputting switch control signals and monochrome data, the switch module is connected with the control module, the power source module and the LED array, the LED array is composed of a plurality of LED pixels, the constant current source set is composed of a plurality of constant current sources, and stable electric currents produced by the constant current sources which receive the monochrome data are output to a monochrome LED lamp which is connected with a power supply line which is gated by the switch module, so that power consumption is reduced, energy saving is achieved and hardware cost is not increased.
Description
Technical field
The invention belongs to the display technique of video, relate in particular to a kind of energy-saving LED screen dynamic scan device, energy-saving LED screen and dynamic scan method.
Background technology
At present, LED electronic display (being the LED screen) as the electronic display unit of a kind of digitizing, high brightness, is widely used in each demonstration field by people.But the LED electronic display is owing to turn round for a long time, and power consumption is many, and each functional part heating of LED electronic display, temperature raise, and the life-span of LED electronic display is reduced greatly.In order to reduce electric cost and to prolong the serviceable life of LED electronic display, how effectively to reduce the unnecessary power wastage of LED electronic display and become the problem that realistic meaning is arranged very much.
The type of drive of LED electronic display is divided into static drive and dynamic scan drives.In order to save constant-current driven chip, in a large amount of LED electronic displays, all adopt the dynamic scan type of drive at present, the basic implementation of dynamic scan type of drive is the switch by a plurality of PMOS pipes of quick control, realizes that a plurality of LED lamps share a constant current source and carry out the timesharing driving.The power source design of a large amount of traditional LED electronic displays of using as shown in Figure 1 at present, red in the lamp plate, green, the control module that blue led lamp (RGB tri coloured lantern) and a plurality of PMOS transistor form all is connected to a power module and uses with a kind of supply voltage VCC and power, because different monochromatic LED lamp forward conduction voltage VF are different, especially the VF of red LED lamp will be far smaller than indigo plant, green LED lamp, use same power supply power supply, cause this supply voltage VCC must satisfy the needs of the LED lamp of maximum that a kind of monochrome of VF, LED lamp for that less a kind of monochrome of VF has very big waste like this, cause unnecessary energy loss in actual use, produce a large amount of heat, not only increase electric cost, also impaired quality and the life-span of product self.
In order to reach energy-conservation purpose, a kind of energy-saving LED screen as shown in Figure 2, the input end of same constant current source and several monochromatic LED lamps link together, for convenience of explanation, the energy-saving LED screen of 1/3 turntable driving as shown in Figure 3, the input end of same constant current source is connected with three monochromatic LED lamps, actual power at the RGB three-color LED light in the LED screen needs, the method that provides different voltages to power respectively has been provided, reached the purpose that reduces LED screen energy consumption, but this method needs a large amount of PMOS transistors to control different power voltage as switching tube, the PMOS number of transistors that needs increases, and for PMOS number of transistors shown in Figure 13 times can cause a large amount of extra hardware expense, bring the problem of placement-and-routing also for simultaneously the large LED screen display system, improved the cost of LED screen display system.
Summary of the invention
The object of the present invention is to provide a kind of energy-saving LED screen dynamic scan device, energy-saving LED screen and dynamic scan method, both can reduce LED screen energy consumption, do not increase existing LED screen cost again.
In order to address the above problem, the invention provides a kind of energy-saving LED screen, comprising:
One control module, described control module is at 3 * M switch controlling signal of the output of current subframe timesharing successively and corresponding monochromatic data;
One power module, described power module comprises first power supply, second source and the 3rd power supply;
One switch module, described switch module comprises M group switch submodule, every group of switch submodule has 3 supply lines, 3 supply lines in every group of switch submodule are connected with corresponding first power supply, second source and the 3rd power supply respectively, and described switch module is according to the supply line of switch controlling signal gating that receives;
One led array that is constituted by a plurality of LED pixels, described LED pixel is made up of three kinds of monochromatic LED lamps, the negative pole of three kinds of monochromatic LED lamps in the described LED pixel links to each other, described led array is divided into M sub-led array, after the positive pole of the same monochromatic LED lamp in the LED pixel in each described sub-led array is connected, respectively with corresponding one group of switch submodule in a supply line connect;
One constant current source group, described constant current source group is made up of a plurality of constant current sources, one end of each described constant current source is connected with the negative pole of M described LED pixel, the other end ground connection of each described constant current source, the steady current that receives the constant current source generation of described monochromatic data exports the monochromatic LED lamp that is connected with the supply line of gating to, wherein, M is the natural number more than or equal to 1.
Further, described control module comprises:
3 * M control signal end, described control module is exported a described switch controlling signal by 3 * M control signal end respectively successively; With
One monochromatic data output terminal, described control module is by the corresponding monochromatic data of described monochromatic data output terminal output.
Further, 3 supply lines in every group of described switch submodule are formed by a PMOS transistor, the 2nd PMOS transistor and the 3rd PMOS transistor respectively, wherein, the transistorized source electrode of a PMOS, the transistorized source electrode of the 2nd PMOS in every group of described switch submodule and after the transistorized source electrode of the 3rd PMOS is connected respectively is connected with corresponding first power supply, second source and the 3rd power supply respectively again; The transistorized grid of each PMOS in the described switch module control signal end corresponding with respectively connects; Each PMOS transistor drain in every group of described switch submodule respectively with corresponding sub-led array in the LED pixel in the positive pole of same monochromatic LED lamp be connected.
Further, described LED pixel is made up of three kinds of monochromatic LED lamps of RGB.
Further, described energy-saving LED screen comprises that also a code translator, described code translator are connected between the port of described control module output and described switch module receiving key control signal.
In order to reach another aspect of the present invention, a kind of dynamic scan method of energy-saving LED screen also is provided, described dynamic scan method is in current subframe, utilize described energy-saving LED to shield a switch controlling signal and the corresponding monochromatic data of the output of timesharing successively, the different monochromatic LED lamps of controlling in the described energy-saving LED screen are lighted.
Further, the dynamic scan method of described energy-saving LED screen comprises the steps:
Step 1: the control module in the described energy-saving LED screen is exported a described switch controlling signal and corresponding monochromatic data, enters step 2;
Step 2: in described energy-saving LED screen, described switch module is powered to a kind of monochromatic LED lamp that the supply line according to described switch controlling signal gating connects, and the steady current output that produces of the constant current source group described monochromatic data that will receive, so that a kind of described monochromatic LED lamp that is connected with the supply line of gating is lighted after receiving described steady current, enter step 3;
Step 3: described energy-saving LED screen is judged whether the current monochromatic data of current subframe sends and is finished, if transmission finishes, enters step 4, otherwise enter step 2;
Step 4: described energy-saving LED screen judges whether current sub-frame data sends and finishes that transmission does not finish, and enters step 1, otherwise enters step 5;
Step 5: the control module in the described energy-saving LED screen sends the next son frame data.
Preferably, in described step 2, comprising:
Step 21: described switch module is according to the supply line of described switch controlling signal gating with the corresponding connection of a kind of described monochromatic LED lamp, and closes the supply line with the corresponding connection of remaining different monochromatic LED lamps, enters step 22;
Step 22: the steady current output that the described monochromatic data that described constant current source group will receive produces so that a kind of monochromatic LED lamp that is connected with the supply line of gating is lighted after receiving described steady current, enters step 3.
Preferably, in described step 2, comprising:
Step 21: the steady current that the described monochromatic data that described constant current source group will receive produces exports a kind of described monochromatic LED lamp in the described energy-saving LED screen to, enters step 22;
Step 22: described switch module is according to the supply line of described switch controlling signal gating with the corresponding connection of a kind of described monochromatic LED lamp, so that a kind of described monochromatic LED lamp that is connected with the supply line of gating is lighted after receiving described steady current, and close supply line with the corresponding connection of remaining different monochromatic LED lamps, enter step 3.
In order to reach another aspect of the present invention, a kind of energy-saving LED screen dynamic scan device also is provided, comprising:
One control module, described control module is at 3 * M switch controlling signal of the output of current subframe timesharing successively and corresponding monochromatic data;
One power module, described power module comprises first power supply, second source and the 3rd power supply;
One switch module, described switch module comprises M group switch submodule, every group of switch submodule has 3 supply lines, 3 supply lines in every group of switch submodule are connected with first power supply, second source and the 3rd power supply respectively, and described switch module is according to the supply line of switch controlling signal gating that receives;
One led array that is constituted by a plurality of LED pixels, described LED pixel is made up of three kinds of monochromatic LED lamps, the negative pole of three kinds of monochromatic LED lamps in the described LED pixel links to each other, described led array is divided into M sub-led array, after the positive pole of the same monochromatic LED lamp in the LED pixel in each described sub-led array is connected, respectively with corresponding one group of switch submodule in a supply line connect;
One constant current source group, described constant current source group is made up of a plurality of constant current sources, one end of each described constant current source is connected with the negative pole of M described LED pixel, the other end ground connection of each described constant current source, the steady current that receives the constant current source generation of described monochromatic data exports the monochromatic LED lamp that is connected with the supply line of gating to, wherein, M is the natural number more than or equal to 1;
A kind of described monochromatic LED lamp powered by the supply line of described switch controlling signal gating and receive the steady current that described monochromatic data produces after light, send and after demonstration finishes at monochromatic data described in the current subframe, send monochromatic corresponding switch controlling signal and monochromatic data remaining in the current subframe more successively in an identical manner, light corresponding monochromatic LED lamp respectively, send and after demonstration finished, described control module sent the next son frame data at all monochromatic datas of current subframe.
Further, described control module comprises:
3 * M control signal end, described control module is exported a described switch controlling signal by 3 * M control signal end respectively successively; With
One monochromatic data output terminal, described control module is by the corresponding monochromatic data of described monochromatic data output terminal output.
Further, 3 supply lines in every group of described switch submodule are formed by a PMOS transistor, the 2nd PMOS transistor and the 3rd PMOS transistor respectively, wherein, the transistorized source electrode of a PMOS, the transistorized source electrode of the 2nd PMOS in every group of described switch submodule and after the transistorized source electrode of the 3rd PMOS is connected respectively is connected with corresponding first power supply, second source and the 3rd power supply respectively again; The transistorized grid of each PMOS in the described switch module control signal end corresponding with respectively connects; Each PMOS transistor drain in every group of described switch submodule respectively with corresponding sub-led array in the LED pixel in the positive pole of same monochromatic LED lamp be connected.
Further, described LED pixel is made up of three kinds of monochromatic LED lamps of RGB.
Further, described energy-saving LED screen comprises that also a code translator, described code translator are connected between the port of described control module output and described switch module receiving key control signal.
Compared with prior art, a kind of energy-saving LED screen dynamic scan device disclosed by the invention, energy-saving LED screen and dynamic scan method, type of drive according to the monochromatic timesharing scanning of different LED lamp in the led array, the each a kind of monochromatic data that sends in three kinds of colors of control module, because the demonstration of the image in the led array is the average effect of a period of time accumulation, so three kinds of color timesharing show the actual displayed effect that does not influence image.Compare with traditional LED screen, if RGB three chromatic numbers in the common LED screen can send the demonstration data of delegation according to the mode that sends together, the present invention sends monochromatic data in the identical time can light the homochromy LED lamp of triplex row simultaneously, be that same PMOS transistor can connect the homochromy LED lamp of triplex row, and sending the time of data constant, the refresh rate of LED screen is also constant under the equal conditions.
Than existing energy-saving LED screen, PMOS number of transistors of the present invention can be reduced to 1/3rd, has saved a large amount of hardware costs, for the more and more closeer indoor display screen of a distance, reduces the difficulty that the PMOS number of transistors has significantly reduced fabric swatch especially.Therefore, the present invention compares with existing LED screen, can reduce unnecessary power wastage, realizes purpose of energy saving, and does not increase hardware spending.
Description of drawings
Fig. 1 is the power source design synoptic diagram of traditional LED electronic display;
Fig. 2 is the synoptic diagram that traditional energy-saving LED shields;
Fig. 3 is the synoptic diagram of the energy-saving LED screen of traditional 1/3 turntable driving;
Fig. 4 is the structural representation of the scanning of 1/3 in the embodiment of the invention one energy-saving LED screen;
Fig. 5 is the structural representation of the scanning of 1/6 in the embodiment of the invention two energy-saving LED screen;
Fig. 6 is the process flow diagram of the dynamic scan method of energy-saving LED screen of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing the specific embodiment of the present invention is described in detail.
A lot of details have been set forth in the following description so that fully understand the present invention.But the present invention can implement much to be different from alternate manner described here, and those skilled in the art can do similar popularization under the situation of intension of the present invention, so the present invention is not subjected to the restriction of following public concrete enforcement.
In conjunction with Fig. 4 and Fig. 5, a kind of energy-saving LED screen provided by the invention is elaborated.
Embodiment one
Referring to Fig. 4, described energy-saving LED screen comprises a control module 51, a power module 52, a switch module 53, a led array 54 and a constant current source group 55:
Described control module 51 is at 3 * M switch controlling signal of the output of current subframe timesharing successively and corresponding monochromatic data, M is the natural number more than or equal to 1, concrete, described control module 51 has 3 * M control signal end and a monochromatic data output terminal 60, in the present embodiment, when M is 1,3 control signal ends are respectively control signal end 511, control signal end 512 and control signal end 513, switch controlling signal is respectively the R control signal, the G control signal, the B control signal, described control signal end 511 output R control signals, described control signal end 512 output G control signals, described control signal end 513 output B control signals, if described control signal end 511 output R control signals, then described monochromatic data output terminal 60 is exported the R monochromatic datas, if described control signal end 512 output G control signals, then described monochromatic data output terminal 60 is exported the G monochromatic datas, if described control signal end 513 output B control signals, then described monochromatic data output terminal 60 is exported the B monochromatic datas, described control module is exported corresponding switch controlling signal successively by 3 control signal ends under the different timesharing states of same subframe.
Described power module 52 comprises first power supply 521, second source 522 and the 3rd power supply 523.
Described switch module 53 has 1 group of switch submodule 531, described switch submodule has 3 supply lines, 3 supply lines in the described switch submodule are connected with corresponding first power supply, second source and the 3rd power supply respectively, described switch module is according to the supply line of switch controlling signal gating that receives, concrete, 3 supply lines in the described switch submodule are formed by a PMOS transistor 5311, the 2nd PMOS transistor 5312 and the 3rd PMOS transistor 5313 respectively, and concrete annexation is as follows:
The source electrode of the PMOS transistor 5311 in the described switch submodule 531 is connected with described first power supply, the source electrode of the 2nd PMOS transistor 5312 in the described switch submodule 531 is connected with described second source, the source electrode of the 3rd PMOS transistor 5313 in the described switch submodule 531 is connected with described the 3rd power supply; Grid connection control signal end 511 with the PMOS transistor 5311 in the described switch submodule 531, with the grid connection control signal end 512 of the 2nd PMOS transistor 5312 in the described switch submodule 531, with the grid connection control signal end 513 of the 3rd PMOS transistor 5313 in the described switch submodule 531.
Described led array 54 is made of a plurality of LED pixels 5411, described led array 54 has only 1 sub-led array 541, each described LED pixel 5411 is made up of three kinds of monochromatic LED lamps, the negative pole of three kinds of monochromatic LED lamps in each described LED pixel 5411 links to each other, in the present embodiment, described LED pixel 5411 is made up of three kinds of monochromatic LED lamps of RGB, three kinds of monochromes of described RGB are respectively red (R), green (G), blue (B), respectively in described sub-led array, after the positive pole of the red monochromatic LED lamp in each described LED pixel is connected, again with corresponding described switch submodule 531 in the drain electrode of a PMOS transistor 5311 connect, after the positive pole of the green monochromatic LED lamp in each described LED pixel is connected, again with corresponding described switch submodule 531 in the drain electrode of the 2nd PMOS transistor 5312 connect, after the positive pole of the blue monochromatic LED lamp in the described LED pixel is connected, again with corresponding described switch submodule 531 in the drain electrode of the 3rd PMOS transistor 5313 connect red monochromatic LED lamp then, green monochromatic LED lamp and blue monochromatic LED lamp can receive supply voltage VCCR respectively, VCCG and VCCB.
Described constant current source group 55 is made up of a plurality of constant current sources 551, the negative pole of three kinds of monochromatic LED lamps in one end of each described constant current source 551 and the corresponding LED pixel 5411 connects, the other end ground connection of each described constant current source 551, the steady current that receives the constant current source generation of described monochromatic data exports the monochromatic LED lamp that is connected with the supply line of gating to.
Output red monochromatic data when if described control module 51 is exported the R control signals, described switch submodule 531 is according to the R control signal that receives, gating the one PMOS transistor 5311, a PMOS transistor 5311 of gating exports to produce the red monochromatic LED lamp of supply voltage VCCR to the sub-led array 541 with first power supply 521; Described constant current source group 55 starts constant current source according to the red monochromatic data that receives, and to produce the steady current of the red monochromatic LED lamp work in can driven element led array 541, at this moment, red monochromatic LED lamp is lighted and stabilized illumination;
If export green monochromatic data when described control module 51 is exported the G control signals, described switch submodule 531 is according to the G control signal that receives, gating the 2nd PMOS transistor 5312, the 2nd PMOS transistor 5312 of gating exports to produce the green monochromatic LED lamp of supply voltage VCCG to the sub-led array 541 with second source 522; Described constant current source group 55 starts constant current source according to the green monochromatic data that receives, and to produce the steady current of the green monochromatic LED lamp work in can driven element led array 541, at this moment, green monochromatic LED lamp is lighted and stabilized illumination;
Output blue monochromatic data when if described control module 51 is exported the B control signals, described switch submodule 531 is according to the B control signal that receives, gating the 3rd PMOS transistor 5313, the 3rd PMOS transistor 5313 of gating exports to produce the blue monochromatic LED lamp of supply voltage VCCB to the sub-led array 541 with the 3rd power supply 523; Described constant current source group 55 starts constant current source according to the blue monochromatic data that receive, and to produce the steady current of the blue monochromatic LED lamp work in can driven element led array 541, at this moment, blue monochromatic LED lamp is lighted and stabilized illumination.
Embodiment two
Referring to Fig. 5, when M was 2, the difference among described energy-saving LED screen and the embodiment one was:
Described control module 51 has 6 control signal ends, and be respectively control signal end 511, control signal end 512, control signal end 513, control signal end 514, control signal end 515 and control signal end 516, then described control signal end 511 is exported the R control signals, control signal end 512 output G control signals, control signal end 513 output B control signals, control signal end 514 output R control signals, control signal end 515 output G control signals and control signal end 516 output B control signals, therefore described control module is exported corresponding switch controlling signal successively by 6 control signal ends under the different timesharing states of same subframe.
Described switch module 53 has switch submodule 531 and switch submodule 532 (M is 2), described switch submodule 531 and switch submodule 532 have 3 supply lines respectively, 3 supply lines in the described switch submodule 531 respectively with corresponding first power supply, second source is connected with the 3rd power supply, 3 supply lines in the described switch submodule 532 respectively with corresponding first power supply, second source is connected with the 3rd power supply, described switch module is according to the supply line of switch controlling signal gating that receives, concrete, 3 supply lines in the described switch submodule 531 are respectively by a PMOS transistor 5311, the 2nd PMOS transistor 5312 and the 3rd PMOS transistor 5313 form, 3 supply lines in the described switch submodule 532 are respectively by a PMOS transistor 5321, the 2nd PMOS transistor 5322 and the 3rd PMOS transistor 5323 form, and concrete annexation is as follows:
The source electrode of the PMOS transistor 5321 in the source electrode of the PMOS transistor 5311 in the described switch submodule 531 and the switch submodule 532 back that is connected is connected with described first power supply, the source electrode of the 2nd PMOS transistor 5322 in the source electrode of the 2nd PMOS transistor 5312 in the described switch submodule 531 and the switch submodule 532 back that is connected is connected with described second source, and the source electrode of the 3rd PMOS transistor 5323 in the source electrode of the 3rd PMOS transistor 5313 in the described switch submodule 531 and the switch submodule 532 is connected then to be connected with described the 3rd power supply; Grid connection control signal end 511 with the PMOS transistor 5311 in the described switch submodule 531, grid connection control signal end 512 with the 2nd PMOS transistor 532 in the described switch submodule 531, grid connection control signal end 513 with the 3rd PMOS transistor 533 in the described switch submodule 531, grid connection control signal end 514 with the PMOS transistor 5321 in the described switch submodule 532, with the grid connection control signal end 515 of the 2nd PMOS transistor 5322 in the described switch submodule 532, with the grid connection control signal end 516 of the 3rd PMOS transistor 5323 in the described switch submodule 532.
Described led array 54 is divided into sub-led array 541 and sub-led array 542 (M is 2), in described sub-led array 541, after the positive pole of the red monochromatic LED lamp in each described LED pixel is connected, be connected with the drain electrode of a PMOS transistor 5311 in the described switch submodule 531 again, after the positive pole of the green monochromatic LED lamp in each described LED pixel is connected, be connected with the drain electrode of the 2nd PMOS transistor 5312 in the described switch submodule 531 again, after the positive pole of the blue monochromatic LED lamp in each described LED pixel is connected, be connected with the drain electrode of the 3rd PMOS transistor 5313 in the described switch submodule 531 again; In described sub-led array 542, after the positive pole of the red monochromatic LED lamp in each described LED pixel is connected, be connected with the drain electrode of a PMOS transistor 5321 in the described switch submodule 532 again, after the positive pole of the green monochromatic LED lamp in each described LED pixel is connected, be connected with the drain electrode of the 2nd PMOS transistor 5322 in the described switch submodule 532 again, after the positive pole of the blue monochromatic LED lamp in each described LED pixel is connected, be connected with the drain electrode of the 3rd PMOS transistor 5323 in the described switch submodule 532 again, then the red monochromatic LED lamp in each described subarray, green monochromatic LED lamp and blue monochromatic LED lamp can receive supply voltage VCCR respectively, VCCG and VCCB.
Described constant current source group 55 is made up of a plurality of constant current sources 551, and the negative pole in the individual LED pixel 5411 of an end and 2 of each described constant current source 551 (M is 2) is connected.
Output red monochromatic data when if described control module 51 is exported the R control signals, described switch submodule 531 is according to the R control signal that receives, gating the one PMOS transistor 5311, a PMOS transistor 5311 of gating exports to produce the red monochromatic LED lamp of supply voltage VCCR to the sub-led array 541 with first power supply 521; Described constant current source group 55 starts constant current source according to the red monochromatic data that receives, and to produce the steady current of the red monochromatic LED lamp work in can driven element led array 541, at this moment, red monochromatic LED lamp is lighted and stabilized illumination;
If export green monochromatic data when described control module 51 is exported the G control signals, described switch submodule 531 is according to the G control signal that receives, gating the 2nd PMOS transistor 5312, the 2nd PMOS transistor 5312 of gating exports to produce the green monochromatic LED lamp of supply voltage VCCG to the sub-led array 541 with second source 522; Described constant current source group 55 starts constant current source according to the green monochromatic data that receives, and to produce the steady current of the green monochromatic LED lamp work in can driven element led array 541, at this moment, green monochromatic LED lamp is lighted and stabilized illumination;
Output blue monochromatic data when if described control module 51 is exported the B control signals, described switch submodule 531 is according to the B control signal that receives, gating the 3rd PMOS transistor 5313, the 3rd PMOS transistor 5313 of gating exports to produce the blue monochromatic LED lamp of supply voltage VCCB to the sub-led array 541 with the 3rd power supply 523; Described constant current source group 55 starts constant current source according to the blue monochromatic data that receive, and to produce the steady current of the blue monochromatic LED lamp work in can driven element led array 541, at this moment, blue monochromatic LED lamp is lighted and stabilized illumination;
Output red monochromatic data when if described control module 51 is exported the R control signals, described switch submodule 532 is according to the R control signal that receives, gating the one PMOS transistor 5321, a PMOS transistor 5321 of gating exports to produce the red monochromatic LED lamp of supply voltage VCCR to the sub-led array 542 with first power supply 521; Described constant current source group 55 starts constant current source according to the red monochromatic data that receives, and to produce the steady current of the red monochromatic LED lamp work in can driven element led array 542, at this moment, red monochromatic LED lamp is lighted and stabilized illumination;
If export green monochromatic data when described control module 51 is exported the G control signals, described switch submodule 532 is according to the G control signal that receives, gating the 2nd PMOS transistor 5322, the 2nd PMOS transistor 5322 of gating exports to produce the green monochromatic LED lamp of supply voltage VCCG to the sub-led array 542 with second source 522; Described constant current source group 55 starts constant current source according to the green monochromatic data that receives, and to produce the steady current of the green monochromatic LED lamp work in can driven element led array 542, at this moment, green monochromatic LED lamp is lighted and stabilized illumination;
Output blue monochromatic data when if described control module 51 is exported the B control signals, described switch submodule 532 is according to the B control signal that receives, gating the 3rd PMOS transistor 5323, the 3rd PMOS transistor 5323 of gating exports to produce the blue monochromatic LED lamp of supply voltage VCCB to the sub-led array 542 with the 3rd power supply 523; Described constant current source group 55 starts constant current source according to the blue monochromatic data that receive, and to produce the steady current of the blue monochromatic LED lamp work in can driven element led array 542, at this moment, blue monochromatic LED lamp is lighted and stabilized illumination.
Therefore according to the type of drive of the monochromatic timesharing scanning of different LED lamp in the led array, the each a kind of monochromatic data that sends in three kinds of colors of control module, because the demonstration of the image in the LED screen is the average effect of a period of time accumulation, so three kinds of color timesharing show the actual displayed effect that does not influence image.In most preferred embodiment of the present invention, the LED pixel that has as each row in the energy-saving LED of the present invention screen is identical with each capable LED number of pixels that has in traditional LED screen, when M is 1, described switch module 53 has one, RGB three chromatic numbers in traditional LED screen can send the demonstration data of delegation according to the mode that sends together, the present invention sends monochromatic data in the identical time can realize that 1/3 sweeps to homochromy LED lamp, namely can light the homochromy LED lamp of triplex row simultaneously, and sending the time of data constant, the refresh rate of LED screen is also constant under the equal conditions; When M is during greater than 1 natural number, described switch module 53 has M, RGB three chromatic numbers in traditional LED screen can send the demonstration data of delegation according to the mode that sends together, the present invention sends monochromatic data in the identical time can realize that 1/3M sweeps to homochromy LED lamp, namely can light the capable homochromy LED lamp of 3M simultaneously.
Further, the LED number of pixels that the LED pixel that has as each row in the led array in the energy-saving LED screen of the present invention has than each row in traditional LED screen is Duoed or is few, RGB three chromatic numbers in traditional LED screen can send the demonstration data of delegation according to the mode that sends together, the present invention still can realize that 1/3 sweeps to homochromy LED lamp, but the homochromy LED lamp of lighting simultaneously can be 2 row or 4 row, or other row; In like manner, the present invention still can realize that 1/3M sweeps to homochromy LED lamp, but the homochromy LED lamp of lighting simultaneously can not be that 3M is capable.
And, compare with existing LED screen, the PMOS number of transistors in the energy-saving LED screen of the present invention can be reduced to 1/3rd, has saved a large amount of hardware costs, for the more and more closeer indoor display screen of a distance, reduce the difficulty that the PMOS number of transistors has significantly reduced fabric swatch especially.Therefore, the present invention reduces unnecessary power wastage, realizes purpose of energy saving, and does not increase hardware spending.
Further; be connected a code translator between the port of described switch module receiving key control signal and control module output switch control signal; be that the transistorized grid of each PMOS can also link to each other with the output terminal of described code translator; and the controlled module controls of the input end of described code translator; that does not just have essential distinction with the present invention, belongs to the content of the present invention's protection.
The present invention also provides a kind of dynamic scan method of energy-saving LED screen, the principle of the dynamic scan method of described energy-saving LED screen is: in current subframe, utilize described energy-saving LED to shield a switch controlling signal and the corresponding monochromatic data of the output of timesharing successively, the different monochromatic LED lamps of controlling in the described energy-saving LED screen are lighted.Be example with process flow diagram shown in Figure 6, the dynamic scan method of described energy-saving LED screen comprises the steps:
Step 1: the control module in the described energy-saving LED screen is exported a described switch controlling signal and corresponding monochromatic data, enters step 2;
Step 2: in described energy-saving LED screen, described switch module is powered to a kind of monochromatic LED lamp that the supply line according to described switch controlling signal gating connects, and the steady current output that produces of the constant current source group described monochromatic data that will receive, so that a kind of described monochromatic LED lamp that is connected with the supply line of gating is lighted after receiving described steady current, enter step 3;
Step 3: described energy-saving LED screen is judged whether the current monochromatic data of current subframe sends and is finished, if transmission finishes, enters step 4, otherwise enter step 2;
Step 4: described energy-saving LED screen judges whether current sub-frame data sends and finishes that transmission does not finish, and enters step 1, otherwise enters step 5;
Step 5: the control module in the described energy-saving LED screen sends the next son frame data.
In step 2, described switch controlling signal sends earlier, sends corresponding monochromatic data again, that is:
Step 21: described switch module is according to the supply line of described switch controlling signal gating with the corresponding connection of a kind of described monochromatic LED lamp, and closes the supply line with the corresponding connection of remaining different monochromatic LED lamps, enters step 22;
Step 22: the steady current output that the described monochromatic data that described constant current source group will receive produces so that a kind of monochromatic LED lamp that is connected with the supply line of gating is lighted after receiving described steady current, enters step 3.
In step 2, described monochromatic data sends earlier, sends corresponding switch controlling signal again, that is:
Step 21: the steady current that the described monochromatic data that described constant current source group will receive produces exports a kind of described monochromatic LED lamp in the described energy-saving LED screen to, enters step 22;
Step 22: described switch module is according to the supply line of described switch controlling signal gating with the corresponding connection of a kind of described monochromatic LED lamp, so that a kind of described monochromatic LED lamp that is connected with the supply line of gating is lighted after receiving described steady current, and close supply line with the corresponding connection of remaining different monochromatic LED lamps, enter step 3.
Dynamic scan method according to the invention described above, for best supply voltage is provided to a kind of monochromatic LED lamp, a kind of switch controlling signal of the each transmission of control module, avoided the power source method of traditional LED electronic display, power to different monochromatic LED lamps with a kind of supply voltage owing to use, cause the problem that needs the less monochromatic LED lamp of supply voltage energy loss to occur, reduce the generation of a large amount of heats, not only reduced electric cost, and improved quality and the life-span of product self.
In addition, be 1/3 to sweep as energy-saving LED of the present invention screen, then described switch module comprises three PMOS pipes, avoided 1/3 traditional scanning energy-saving LED screen to need a large amount of PMOS transistors to control the problem of different power voltage as switching tube, reduced the problem of extra hardware expense, large LED screen display system placement-and-routing, and the cost of LED screen display system.Therefore energy-saving LED screen of the present invention as be 1/6,1/9 to sweep is compared with traditional 1/6 scanning or the energy-saving LED screen of 1/3M scanning, reduces a large amount of PMOS transistors is controlled different power voltage as switching tube problem also equally.
In addition, control module sends a kind of monochromatic data at every turn, after data send and finish, lights the monochromatic LED lamp of monochromatic data correspondence, and control module sends other monochromatic datas successively in an identical manner, lights the monochromatic LED lamp of other monochromatic data correspondences.When three kinds of colors of RGB respectively corresponding monochromatic data all same subframe send and show finish after, just can in same subframe, realize 1/3 demonstration of sweeping in the LED screen, cycle applications dynamic scan method of the present invention, can realize sweeping with 1/3 is that the dynamic scan of the energy-saving LED screen swept of unit and even 1/3M drives, thereby realizes that LED shields energy-conservation purpose.Below describe at this point.
According to dynamic scan method and the energy-saving LED screen of the energy-saving LED of the invention described above screen, referring to Fig. 4, the present invention also provides a kind of energy-saving LED screen dynamic scan device, comprising:
One control module 51, described control module is at 3 * M switch controlling signal of the output of current subframe timesharing successively and corresponding monochromatic data;
One power module 52, described power module comprise first power supply 521, second source 522 and the 3rd power supply 523;
One switch module 53, described switch module comprises M group switch submodule, every group of switch submodule has 3 supply lines, 3 supply lines in every group of switch submodule are connected with corresponding first power supply, second source and the 3rd power supply respectively, and described switch module is according to the supply line of switch controlling signal gating that receives;
One led array 54 that is constituted by a plurality of LED pixels 5411, described LED pixel is made up of three kinds of monochromatic LED lamps, the negative pole of three kinds of monochromatic LED lamps in the described LED pixel links to each other, described led array is divided into M sub-led array, after the positive pole of the same monochromatic LED lamp in the LED pixel in each described sub-led array is connected, respectively with corresponding one group of switch submodule in a supply line connect;
One constant current source group 55, described constant current source group is made up of a plurality of constant current sources, one end of each described constant current source is connected with the negative pole of M described LED pixel, the other end ground connection of each described constant current source, the steady current that receives the constant current source generation of described monochromatic data exports the monochromatic LED lamp that is connected with the supply line of gating to, wherein, M is the natural number more than or equal to 1;
A kind of described monochromatic LED lamp powered by the supply line of described switch controlling signal gating and receive the steady current that described monochromatic data produces after light, send and after demonstration finishes at monochromatic data described in the current subframe, send monochromatic corresponding switch controlling signal and monochromatic data remaining in the current subframe more successively in an identical manner, light corresponding monochromatic LED lamp respectively, send and after demonstration finished, described control module sent the next son frame data at all monochromatic datas of current subframe.
Therefore, when described control module 51 sends the monochromatic data of a switch controlling signal and correspondence, a supply line in one group of described switch submodule is corresponding to receive described switch controlling signal, a kind of monochromatic LED lamp that is connected with the supply line of gating receives a supply voltage then, and after a kind of described monochromatic LED lamp that steady current exports to the supply line of gating is connected of constant current source group according to the described monochromatic data generation that receives, described monochromatic LED lamp just can be lighted.
When M is 1, the energy-saving LED of illustrated embodiment of the present invention screen dynamic scan device also is 1/3 to sweep, when M is during greater than 1 natural number, how in the same way those of ordinary skills should know, utilize the dynamic scan method of energy-saving LED of the present invention screen to extend to 1/3M and sweep, sweep with the 1/3M that realizes energy-saving LED screen dynamic scan device.
Each embodiment adopts the mode of going forward one by one to describe in this instructions, and what each embodiment stressed is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.For the disclosed system of embodiment, because corresponding with the embodiment disclosed method, so description is fairly simple, relevant part partly illustrates referring to method and gets final product.
The professional can also further recognize, unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein, can realize with electronic hardware, computer software or the combination of the two, for the interchangeability of hardware and software clearly is described, composition and the step of each example described in general manner according to function in the above description.These functions still are that software mode is carried out with hardware actually, depend on application-specific and the design constraint of technical scheme.The professional and technical personnel can specifically should be used for using distinct methods to realize described function to each, but this realization should not thought and exceeds scope of the present invention.
Obviously, those skilled in the art can carry out various changes and modification to invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these revise and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these change and modification.
Claims (14)
1. an energy-saving LED screen is characterized in that, comprising:
One control module, described control module is at 3 * M switch controlling signal of the output of current subframe timesharing successively and corresponding monochromatic data;
One power module, described power module comprises first power supply, second source and the 3rd power supply;
One switch module, described switch module comprises M group switch submodule, every group of switch submodule has 3 supply lines, 3 supply lines in every group of switch submodule are connected with corresponding first power supply, second source and the 3rd power supply respectively, and described switch module is according to the supply line of switch controlling signal gating that receives;
One led array that is constituted by a plurality of LED pixels, described LED pixel is made up of three kinds of monochromatic LED lamps, the negative pole of three kinds of monochromatic LED lamps in the described LED pixel links to each other, described led array is divided into M sub-led array, after the positive pole of the same monochromatic LED lamp in the LED pixel in each described sub-led array is connected, respectively with corresponding one group of switch submodule in a supply line connect;
One constant current source group, described constant current source group is made up of a plurality of constant current sources, one end of each described constant current source is connected with the negative pole of M described LED pixel, the other end ground connection of each described constant current source, the steady current that receives the constant current source generation of described monochromatic data exports the monochromatic LED lamp that is connected with the supply line of gating to, wherein, M is the natural number more than or equal to 1.
2. energy-saving LED as claimed in claim 1 shields, and it is characterized in that described control module comprises:
3 * M control signal end, described control module is exported a described switch controlling signal by 3 * M control signal end respectively successively; With
One monochromatic data output terminal, described control module is by the corresponding monochromatic data of described monochromatic data output terminal output.
3. energy-saving LED as claimed in claim 2 screen is characterized in that, 3 supply lines in every group of described switch submodule are formed by a PMOS transistor, the 2nd PMOS transistor and the 3rd PMOS transistor respectively, wherein,
The transistorized source electrode of a PMOS, the transistorized source electrode of the 2nd PMOS in every group of described switch submodule and after the transistorized source electrode of the 3rd PMOS is connected respectively is connected with corresponding first power supply, second source and the 3rd power supply respectively again;
The transistorized grid of each PMOS in the described switch module control signal end corresponding with respectively connects;
Each PMOS transistor drain in every group of described switch submodule respectively with corresponding sub-led array in the LED pixel in the positive pole of same monochromatic LED lamp be connected.
4. energy-saving LED screen as claimed in claim 1 is characterized in that described LED pixel is made up of three kinds of monochromatic LED lamps of RGB.
5. energy-saving LED screen as claimed in claim 1 is characterized in that, also comprises a code translator, and described code translator is connected between the port of described control module output and described switch module receiving key control signal.
6. the dynamic scan method of energy-saving LED screen, it is characterized in that, in current subframe, utilize the switch controlling signal and the corresponding monochromatic data that shield the output of timesharing successively as any described energy-saving LED of claim 1-5, the different monochromatic LED lamps of controlling in the described energy-saving LED screen are lighted.
7. the dynamic scan method of energy-saving LED screen as claimed in claim 6 is characterized in that, comprises the steps:
Step 1: the control module in the described energy-saving LED screen is exported a described switch controlling signal and corresponding monochromatic data, enters step 2;
Step 2: in described energy-saving LED screen, described switch module is powered to a kind of monochromatic LED lamp that the supply line according to described switch controlling signal gating connects, and the steady current output that produces of the constant current source group described monochromatic data that will receive, so that a kind of described monochromatic LED lamp that is connected with the supply line of gating is lighted after receiving described steady current, enter step 3;
Step 3: described energy-saving LED screen is judged whether the current monochromatic data of current subframe sends and is finished, if transmission finishes, enters step 4, otherwise enter step 2;
Step 4: described energy-saving LED screen judges whether current sub-frame data sends and finishes that transmission does not finish, and enters step 1, otherwise enters step 5;
Step 5: the control module in the described energy-saving LED screen sends the next son frame data.
8. the dynamic scan method of energy-saving LED screen as claimed in claim 7 is characterized in that, in described step 2, comprising:
Step 21: described switch module is according to the supply line of described switch controlling signal gating with the corresponding connection of a kind of described monochromatic LED lamp, and closes the supply line with the corresponding connection of remaining different monochromatic LED lamps, enters step 22;
Step 22: the steady current output that the described monochromatic data that described constant current source group will receive produces so that a kind of monochromatic LED lamp that is connected with the supply line of gating is lighted after receiving described steady current, enters step 3.
9. the dynamic scan method of energy-saving LED screen as claimed in claim 7 is characterized in that, in described step 2, comprising:
Step 21: the steady current that the described monochromatic data that described constant current source group will receive produces exports a kind of described monochromatic LED lamp in the described energy-saving LED screen to, enters step 22;
Step 22: described switch module is according to the supply line of described switch controlling signal gating with the corresponding connection of a kind of described monochromatic LED lamp, so that a kind of described monochromatic LED lamp that is connected with the supply line of gating is lighted after receiving described steady current, and close supply line with the corresponding connection of remaining different monochromatic LED lamps, enter step 3.
10. an energy-saving LED screen dynamic scan device is characterized in that, comprising:
One control module, described control module is at 3 * M switch controlling signal of the output of current subframe timesharing successively and corresponding monochromatic data;
One power module, described power module comprises first power supply, second source and the 3rd power supply;
One switch module, described switch module comprises M group switch submodule, every group of switch submodule has 3 supply lines, 3 supply lines in every group of switch submodule are connected with first power supply, second source and the 3rd power supply respectively, and described switch module is according to the supply line of switch controlling signal gating that receives;
One led array that is constituted by a plurality of LED pixels, described LED pixel is made up of three kinds of monochromatic LED lamps, the negative pole of three kinds of monochromatic LED lamps in the described LED pixel links to each other, described led array is divided into M sub-led array, after the positive pole of the same monochromatic LED lamp in the LED pixel in each described sub-led array is connected, respectively with corresponding one group of switch submodule in a supply line connect;
One constant current source group, described constant current source group is made up of a plurality of constant current sources, one end of each described constant current source is connected with the negative pole of M described LED pixel, the other end ground connection of each described constant current source, the steady current that receives the constant current source generation of described monochromatic data exports the monochromatic LED lamp that is connected with the supply line of gating to, wherein, M is the natural number more than or equal to 1;
A kind of described monochromatic LED lamp powered by the supply line of described switch controlling signal gating and receive the steady current that described monochromatic data produces after light, send and after demonstration finishes at monochromatic data described in the current subframe, send monochromatic corresponding switch controlling signal and monochromatic data remaining in the current subframe more successively in an identical manner, light corresponding monochromatic LED lamp respectively, send and after demonstration finished, described control module sent the next son frame data at all monochromatic datas of current subframe.
11. energy-saving LED screen dynamic scan device as claimed in claim 10 is characterized in that described control module comprises:
3 * M control signal end, described control module is exported a described switch controlling signal by 3 * M control signal end respectively successively; With
One monochromatic data output terminal, described control module is by the corresponding monochromatic data of described monochromatic data output terminal output.
12. energy-saving LED as claimed in claim 10 screen dynamic scan device is characterized in that, 3 supply lines in every group of described switch submodule are formed by a PMOS transistor, the 2nd PMOS transistor and the 3rd PMOS transistor respectively, wherein,
The transistorized source electrode of a PMOS, the transistorized source electrode of the 2nd PMOS in every group of described switch submodule and after the transistorized source electrode of the 3rd PMOS is connected respectively is connected with corresponding first power supply, second source and the 3rd power supply respectively again;
The transistorized grid of each PMOS in the described switch module control signal end corresponding with respectively connects;
Each PMOS transistor drain in every group of described switch submodule respectively with corresponding sub-led array in the LED pixel in the positive pole of same monochromatic LED lamp be connected.
13. energy-saving LED screen dynamic scan device as claimed in claim 10 is characterized in that described LED pixel is made up of three kinds of monochromatic LED lamps of RGB.
14. energy-saving LED screen dynamic scan device as claimed in claim 10 is characterized in that also comprise a code translator, described code translator is connected between the port of described control module output and described switch module receiving key control signal.
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