CN102592542A - Blanking control circuit for LED (light-emitting diode) display screens and LED drive chip - Google Patents
Blanking control circuit for LED (light-emitting diode) display screens and LED drive chip Download PDFInfo
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- CN102592542A CN102592542A CN2012100456072A CN201210045607A CN102592542A CN 102592542 A CN102592542 A CN 102592542A CN 2012100456072 A CN2012100456072 A CN 2012100456072A CN 201210045607 A CN201210045607 A CN 201210045607A CN 102592542 A CN102592542 A CN 102592542A
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Abstract
The invention belongs to the field of LED (light-emitting diode) drive control, and provides a blanking control circuit for LED (light-emitting diode) display screens and an LED drive chip. According to the invention, by adopting the blanking control circuit (comprising a time-sequence control module and a blanking module) for the LED (light-emitting diode) display screens, in the line scanning process of an LED display screen, the blanking module charges parasitic capacitors in each line of the LED display screen in a time gap generated by scanning every two lines of LEDs so to achieve the purpose of effectively eliminating a smearing phenomenon; meanwhile, a drive circuit module realizes the accurate constant current control on each line of LEDs on the LED display screen, so that the image display quality of the LED display screen is improved, thereby solving the problem that in the prior art, the display quality of the LED display screen is low because the accurate constant current control on LEDs can not be realized.
Description
Technical field
The invention belongs to LED drive controlling field, relate in particular to a kind of LED display blanking control circuit and LED chip for driving.
Background technology
Along with LED display is applied to our daily life and work more and more widely, people are also increasingly high to the requirement of LED display, and high refresh rate and large scale are that most of user is desired.Yet; The sharpness that high refresh rate and large scale can cause image to show reduces; And the main cause that causes image definition is to have stray capacitance on column rule and the alignment of LED display, in the scanning process of being expert at, if the electric current blanking can't be well controlled; Smear then can occur and show phenomenon, have a strong impact on the sharpness of image.
To the problems referred to above; Prior art provides a kind of blanking circuit, and it charges to stray capacitance in the scanning process of being expert at through on each alignment of LED display, adding a pull-up resistor in advance; And then the generation of elimination smear phenomenon, to improve the sharpness that image shows.Yet; Prior art but is expert at because having added pull-up resistor and has been increased power consumption in the demonstration time, has increased cost, makes the working current of LED can't obtain accurate constant current control simultaneously; Influence the display consistency of LED display, reduced the display quality of LED display.Therefore, prior art exists and can't realize accurate constant current control to LED, causes the low problem of display quality of LED display.
Summary of the invention
The object of the present invention is to provide a kind of LED display blanking control circuit, be intended to solve existing in prior technology and can't realize accurate constant current control, cause the low problem of display quality of LED display LED.
The present invention is achieved in that a kind of LED display blanking control circuit, is connected with direct supply, drive circuit module and external piloting control device, and said LED display blanking control circuit comprises:
Time-sequence control module; Input end is connected with the enable signal end of said external piloting control device; The Enable Pin of the said drive circuit module of the first output termination; Be used for the control signal of exporting from said external piloting control device that enables is carried out sequential processing, and control the duty of said drive circuit module through said first output terminal;
The blanking module; Second output terminal of the said time-sequence control module of control termination; The output terminal of the said direct supply of input termination; Output terminal is connected with the output terminal of said drive circuit module and the control end of LED display simultaneously, is used for according to the output level of second output terminal of said time-sequence control module the stray capacitance of each alignment of LED display being charged.
Another object of the present invention also is to provide a kind of LED chip for driving; Said LED chip for driving comprises drive circuit module and LED display blanking control circuit; Said LED display blanking control circuit is connected with direct supply, said drive circuit module and external piloting control device, and said LED display blanking control circuit comprises:
Time-sequence control module; Input end is connected with the enable signal end of said external piloting control device; The Enable Pin of the said drive circuit module of the first output termination; Be used for the control signal of exporting from said external piloting control device that enables is carried out sequential processing, and control the duty of said drive circuit module through said first output terminal;
The blanking module; Second output terminal of the said time-sequence control module of control termination; The output terminal of the said direct supply of input termination; Output terminal is connected with the output terminal of said drive circuit module and the control end of LED display simultaneously, is used for according to the output level of second output terminal of said time-sequence control module the stray capacitance of each alignment of LED display being charged.
In the present invention; The LED display blanking control circuit that comprises said time-sequence control module and said blanking module through employing; In LED display line scanning process, the blanking module is charged to the stray capacitance of each alignment of LED display in space sweep time of per two row, to reach the purpose of eliminating the smear phenomenon effectively; Make drive circuit module realize accurate constant current control simultaneously to respectively being listed as LED in the LED display; Improved the image displaying quality of LED display, can't realize accurate constant current control to LED, caused the low problem of display quality of LED display thereby solved existing in prior technology.
Description of drawings
Fig. 1 is the modular structure figure of the LED display blanking control circuit that provides of first embodiment of the invention;
Fig. 2 is the exemplary circuit structural drawing of the LED display blanking control circuit that provides of second embodiment of the invention;
Fig. 3 is the progress of work sequential chart of the LED display blanking control circuit that provides of second embodiment of the invention;
Fig. 4 is the exemplary circuit structural drawing of the LED display blanking control circuit that provides of third embodiment of the invention;
Fig. 5 is the progress of work sequential chart of the LED display blanking control circuit that provides of third embodiment of the invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
In embodiments of the present invention; The LED display blanking control circuit that comprises time-sequence control module and blanking module through employing; In LED display line scanning process, the blanking module is charged to the stray capacitance of each alignment of LED display in space sweep time of per two row, to reach the purpose of eliminating the smear phenomenon effectively; Make drive circuit module realize accurate constant current control simultaneously, improved the image displaying quality of LED display respectively being listed as LED in the LED display.
Be described in detail below in conjunction with the concrete realization of specific embodiment the LED display blanking control circuit:
Embodiment one:
Fig. 1 shows the modular structure figure of the LED display blanking control circuit that first embodiment of the invention provides, and for the ease of explanation, only shows the part relevant with first embodiment of the invention, and details are as follows:
LED display blanking control circuit 100 is connected with direct supply 200, drive circuit module 300 and external piloting control device 400, and LED display blanking control circuit 100 comprises:
Time-sequence control module 101; Input end is connected with the enable signal end of external piloting control device 400; The Enable Pin of the first output termination drive circuit module 300; Be used for the control signal of exporting from external piloting control device 400 that enables is carried out sequential processing, and pass through the duty of the first output terminal control Driver Circuit module 300.
In embodiments of the present invention; External piloting control device 400 also is connected with decoder driver circuit 500; Control end is corresponding one by one is connected for each row of each row choosing end of decoder driver circuit 500 and LED display 600, and decoder driver circuit 500 is used for the LED according to gating instruction unlatching LED display 600 certain delegation of external piloting control device 400 outputs.
Embodiment two:
Fig. 2 shows the exemplary circuit structural drawing of the LED display blanking control circuit that second embodiment of the invention provides, and for the ease of explanation, only shows the part relevant with second embodiment of the invention, and details are as follows:
As one embodiment of the invention, time-sequence control module 101 comprises:
The first rejection gate U1, the first phase inverter INV1, the first buffer BUF1, the second buffer BUF2 and Sheffer stroke gate U2;
The first input end 1 of the first rejection gate U1 is the input end of time-sequence control module 101; The input end of the output termination first phase inverter INV1 of the first rejection gate U1; The output terminal of the first phase inverter INV1 is first output terminal of time-sequence control module 101; The first input end 1 of the input termination first rejection gate U1 of the first buffer BUF1; The output terminal of the first buffer BUF1 is connected with second input end 2 of the first rejection gate U1 and the input end of the second buffer BUF2 simultaneously; The first input end 1 of Sheffer stroke gate U2 is connected with the output terminal of the second buffer BUF2 and the input end of the first buffer BUF1 respectively with second input end 2, and the output terminal of Sheffer stroke gate U2 is second output terminal of time-sequence control module 101.
As one embodiment of the invention; Blanking module 102 comprises a plurality of PMOS pipes; The grid of these a plurality of PMOS pipes connects the control end that forms blanking module 102 altogether; The source electrode of these a plurality of PMOS pipes connects the input end that forms blanking module 102 altogether, and the drain electrode of each the PMOS pipe in these a plurality of PMOS pipes constitutes the output terminal of blanking module 102 jointly.
In embodiments of the present invention; The number of the PMOS pipe in the blanking module 102 depends on the alignment quantity of the LED display 600 that drive circuit module 300 is connected; Promptly the alignment quantity in LED display 600 is n; The number of PMOS pipe is n (n is a positive integer) in the then blanking module 102, corresponding each alignment that connects LED display 600 of the drain electrode of each PMOS pipe.In Fig. 2, rise from left to right to PMOS pipe Mp1 to PMOS manages Mpn, the drain electrode of PMOS pipe Mp1 to PMOS pipe Mpn is connected to alignment n is corresponding one by one with the alignment 1 of LED display 600 respectively.The alignment 1 of LED display 600 constitutes the control end of LED display 600 jointly to alignment n, and the drive end OUT1 of drive circuit module 300 constitutes its output terminal jointly to drive end OUTn.
In embodiments of the present invention, the enable signal of the enable signal end of external piloting control device 400 output is divided into two kinds of high level and low levels, and wherein, high level is invalid enable signal, and low level is effective enable signal.
Be elaborated below in conjunction with the principle of work of object lesson to the LED display blanking control circuit:
For example; In the sequential lines scanning process of LED display 600; External piloting control device 400 sends first row that designated command decoder driver circuit 500 is opened LED display 600; The voltage of this row is drawn high to the output voltage values of direct supply 200, and external piloting control device 400 is exported effective enable signal (low level) to time-sequence control module 101 through its enable signal end then, and then second input end 2 of Sheffer stroke gate U2 is the low level input; And since the first buffer BUF1 (delay time is T1) and the second buffer BUF2 (delay time is T2) effective enable signal is delayed time; So this moment, the first input end 1 of Sheffer stroke gate U2 was kept the high level input of previous moment, then all PMOS pipes in its output terminal output high level control blanking module 102 by (when the T1+T2 time period finishes, the first input end 1 of Sheffer stroke gate U2 and second input end, 2 equal input low levels; Its output terminal is kept high level output, and all PMOS pipes are kept cut-off state).When all PMOS pipes begin to end; The first input end 1 of the first rejection gate U1 is the low level input; And since the first buffer BUF1 effective enable signal has been delayed time the T1 time period, so this moment the first rejection gate U1 second input end 2 keep the high level input of previous moment, then its output terminal output low level; This low level becomes high level is kept all drive ends with control Driver Circuit module 300 closed condition after through the first phase inverter INV1; By the time when the T1 time period finished, second input end 2 of the first rejection gate U1 became the low level input, the first phase inverter INV1 is output low level; And then the drive end OUT1 to OUTn of unlatching drive circuit module 300, thereby make the LED of LED display first row realize lighting demonstration according to preset illumination effect.
When effectively the output time section of enable signal (low level) finishes; The external piloting control device 400 invalid enable signals of output (high level) are to time-sequence control module 101; Then the first input end of the first rejection gate U1 becomes the high level input; Because the first buffer BUF1 can be to the invalid enable signal time-delay T1 time period; So this moment, second input end 2 of rejection gate U1 was kept the low level input of previous moment, its output terminal output low level, this low level become high level after through the first phase inverter INV1 and close its drive end OUT1 to OUTn (when the T1 time period finishes with control Driver Circuit module 300; The first input end 1 of rejection gate U1 and second input end, 2 equal input high levels; Its output terminal is kept low level output, and the first phase inverter INV1 also keeps high level output, and then the drive end OUT1 to OUTn of drive circuit module 300 keeps closed condition).When the drive end OUT1 to OUTn of drive circuit module 300 begins to get into closed condition; Second input end 2 of Sheffer stroke gate U2 is the high level input; And since the first buffer BUF1 (delay time is T1) and the second buffer BUF2 (delay time is T2) invalid enable signal is delayed time; So this moment, the first input end 1 of Sheffer stroke gate U2 was kept the low level input of previous moment, then its output terminal continues output high level and makes all PMOS pipes in the blanking module 102 keep cut-off state, by the time the T1+T2 time period is when finishing; The first input end 1 of Sheffer stroke gate U2 becomes the high level input; Then all PMOS pipe conductings in its output terminal output low level control blanking module 102, thus all PMOS pipes are charged to the stray capacitance of LED display 600 each alignment correspondingly, and before opening second row of LED display 600; The stray capacitance voltage of each alignment is drawn high to magnitude of voltage VDD (VDD is the output voltage of direct supply 200), to realize eliminating the purpose of smear.
After the first row LED shows end; External piloting control device 400 can send designated command decoder driver circuit 500 and open the second row LED, and whole LED display screen blanking control circuit begins again according to the above-mentioned course of work stray capacitance of LED display 600 each alignment to be charged to reach the purpose of elimination smear.
Fig. 3 shows LED display blanking control circuit and the corresponding progress of work sequential chart of above-mentioned principle of work that second embodiment of the invention provides; Wherein, FL is the unblocked level signal of LED display 600 first row; SL is the unblocked level signal (FL and SL are the level signal with the unlatching LED display LED of delegation that decoder driver circuit 500 is exported according to the instruction of external piloting control device 400) of LED display 600 second row; OE is the enable signal of the enable signal end output of external piloting control device 400, and PMOS is the grid level of all PMOS pipes in the blanking module 102, and OUT is the received level signal of the Enable Pin of drive circuit module 300.
Embodiment three:
Fig. 4 shows the exemplary circuit structural drawing of the LED display blanking control circuit that third embodiment of the invention provides, and for the ease of explanation, only shows the part relevant with third embodiment of the invention, and details are as follows:
As one embodiment of the invention, time-sequence control module 101 comprises:
The second rejection gate U3, the second phase inverter INV2, the 3rd buffer BUF3, the 4th buffer BUF4 reach and a door U4;
The first input end 1 of the second rejection gate U3 is the input end of time-sequence control module 101; The input end of the output termination second phase inverter INV2 of the second rejection gate U3; The output terminal of the second phase inverter INV2 is first output terminal of time-sequence control module 101; The first input end 1 of the input termination second rejection gate U3 of the 3rd buffer BUF3; The output terminal of the 3rd buffer BUF3 is connected with second input end 2 of the second rejection gate U3 and the input end of the 4th buffer BUF4 simultaneously; Be connected with the output terminal of the 4th buffer BUF4 and the input end of the 3rd buffer BUF3 respectively with second input end 2 with the first input end 1 of door U4, with the output terminal of door U4 be second output terminal of time-sequence control module 101.
Wherein, the delay time of the 3rd buffer BUF3 and the 4th buffer BUF4 is identical with the delay time T2 of delay time T1 and the second buffer BUF2 of the first buffer BUF1 in the second embodiment of the invention respectively.
As one embodiment of the invention; Blanking module 102 comprises a plurality of NMOS pipes; The grid of these a plurality of NMOS pipes connects the control end that forms blanking module 102 altogether; The drain electrode of these a plurality of NMOS pipes connects the input end that forms blanking module 102 altogether, and the source electrode of each the NMOS pipe in these a plurality of NMOS pipes constitutes the output terminal of blanking module 102 jointly.
In embodiments of the present invention; The number of the NMOS pipe in the blanking module 102 depends on the alignment quantity of the LED display 600 that drive circuit module 300 is connected; Promptly the alignment quantity in LED display 600 is k; The number of NMOS pipe is k (k is a positive integer) in the then blanking module 102, corresponding each alignment that connects LED display 600 of the drain electrode of each NMOS pipe.In Fig. 4, rise from left to right to NMOS pipe Mn1 to NMOS manages Mnk, the source electrode of NMOS pipe Mn1 to NMOS pipe Mnk is connected to alignment k is corresponding one by one with the alignment 1 of LED display respectively.The alignment 1 of LED display 600 constitutes the control end of LED display 600 jointly to alignment k, and the drive end OUT1 of drive circuit module 300 constitutes its output terminal jointly to drive end OUTk.
In embodiments of the present invention, the enable signal of the enable signal end of external piloting control device 400 output is divided into two kinds of high level and low levels, and wherein, high level is invalid enable signal, and low level is effective enable signal.
Be elaborated below in conjunction with the principle of work of object lesson to the LED display blanking control circuit:
For example; In the sequential lines scanning process of LED display 600; External piloting control device 400 sends first row that designated command decoder driver circuit 500 is opened LED display 600; The voltage of this row is drawn high to the output voltage values of direct supply 200, and external piloting control device 400 is exported effective enable signal (low level) to time-sequence control module 101 through its enable signal end then, and then second input end 2 with door U4 is the low level input; And since the 3rd buffer BUF3 (delay time is T1) and the 4th buffer BUF4 (delay time is T2) effective enable signal is delayed time; So import with the high level that the first input end 1 of door U4 is kept previous moment this moment, then all NMOS pipes in its output terminal output low level control blanking module 102 are by (when the T1+T2 time period finishes, with first input end 1 and second input end, the 2 equal input low levels of door U4; Its output terminal is kept low level output, and all NMOS pipes are kept cut-off state).When all NMOS pipes begin to end; The first input end 1 of the second rejection gate U3 is the low level input; And since the 3rd buffer BUF3 effective enable signal has been delayed time the T1 time period, so this moment the second rejection gate U3 second input end 2 keep the high level input of previous moment, then its output terminal output low level; This low level becomes high level is kept all drive ends with control Driver Circuit module 300 closed condition after through the second phase inverter INV2; By the time when the T1 time period finished, second input end 2 of the second rejection gate U3 became the low level input, the second phase inverter INV2 is output low level; And then the drive end OUT1 to OUTk of unlatching drive circuit module 300, thereby make the LED of LED display 600 first row realize lighting demonstration according to preset illumination effect.
When effectively the output time section of enable signal (low level) finishes; The external piloting control device 400 invalid enable signals of output (high level) are to time-sequence control module 101; Then the first input end of the second rejection gate U3 becomes the high level input; Because the 3rd buffer BUF3 can be to the invalid enable signal time-delay T1 time period; So this moment, second input end 2 of the second rejection gate U3 was kept the low level input of previous moment, its output terminal output low level, this low level become high level after through phase inverter INV1 and close its drive end OUT0 to OUTk (when the T1 time period finishes with control Driver Circuit module 300; The first input end 1 of the second rejection gate U3 and second input end, 2 equal input high levels; Its output terminal is kept low level output, and the second phase inverter INV2 also keeps high level output, and then the drive end OUT1 to OUTk of drive circuit module 300 keeps closed condition).When the drive end OUT1 to OUTk of drive circuit module 300 begins to get into closed condition; Be the high level input with second input end 2 of door U4; And since the 3rd buffer BUF3 (delay time is T1) and the 4th buffer BUF4 (delay time is T2) invalid enable signal is delayed time; So this moment and the first input end 1 of door U4 are kept the low level input of previous moment, then its output terminal continues output low level and makes all NMOS pipes in the blanking module 102 keep cut-off state, by the time the T1+T2 time period is when finishing; Become the high level input with the first input end 1 of door U4; Then all NMOS pipe conductings in its output terminal output high level control blanking module 102, thus all NMOS pipes are charged to the stray capacitance of LED display 600 each alignment correspondingly, and before opening second row of LED display 600; The stray capacitance voltage of each alignment is drawn high the (V=VDD-Vth to magnitude of voltage V; VDD is the output voltage of direct supply 200, and Vth is the threshold voltage of NMOS pipe), to realize eliminating the purpose of smear.
After the first row LED shows end; External piloting control device 400 can send designated command decoder driver circuit 500 and open the second row LED, and whole LED display screen blanking control circuit 100 begins again according to the above-mentioned course of work stray capacitance of LED display 600 each alignment to be charged.
Fig. 5 is LED display blanking control circuit and the corresponding progress of work sequential chart of above-mentioned principle of work that third embodiment of the invention provides; Wherein, FL is the unblocked level signal of LED display 600 first row; SL is the unblocked level signal (FL and SL are the level signal with the unlatching LED display LED of delegation that decoder driver circuit 500 is exported according to the instruction of external piloting control device 400) of LED display 600 second row; OE is the enable signal of the enable signal end output of external piloting control device 400, and NMOS is the grid level of all NMOS pipes in the blanking module 102, and OUT is the received level signal of the Enable Pin of drive circuit module 300.
In embodiments of the present invention; Adopt the stray capacitance of 102 pairs of each alignments of LED display of blanking module of PMOS pipe or NMOS pipe formation to charge to eliminate smear; Both reduced the power consumption of entire circuit system; Practice thrift cost again, promoted the reliability and stability of LED display blanking control circuit comprehensively.
Another purpose of the embodiment of the invention also is to provide a kind of LED chip for driving; This LED chip for driving comprises drive circuit module and LED display blanking control circuit; The LED display blanking control circuit is connected with direct supply, drive circuit module and external piloting control device, and this LED display blanking control circuit comprises:
Time-sequence control module; Input end is connected with the enable signal end of external piloting control device; The Enable Pin of the first output termination drive circuit module; Be used for the control signal of exporting from the external piloting control device that enables is carried out sequential processing, and control the duty of said drive circuit module through first output terminal;
The blanking module; Second output terminal of control termination time-sequence control module; The output terminal of input termination direct supply; Output terminal is connected with the output terminal of drive circuit module and the control end of LED display simultaneously, when being used for the second output terminal output low level when the sequential control module, the stray capacitance of each alignment of LED display is charged.
Wherein, the circuit structure that the particular circuit configurations of time-sequence control module and blanking module and second embodiment of the invention and the 3rd embodiment are provided is identical, therefore repeats no more.
In embodiments of the present invention; The LED display blanking control circuit that comprises time-sequence control module and blanking module through employing; In LED display line scanning process, the blanking module is charged to the stray capacitance of each alignment of LED display in space sweep time of per two row, to reach the purpose of eliminating the smear phenomenon effectively; Make drive circuit module realize accurate constant current control simultaneously to respectively being listed as LED in the LED display; Improved the image displaying quality of LED display, can't realize accurate constant current control to LED, caused the low problem of display quality of LED display thereby solved existing in prior technology.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a LED display blanking control circuit is connected with direct supply, drive circuit module and external piloting control device, it is characterized in that said LED display blanking control circuit comprises:
Time-sequence control module; Input end is connected with the enable signal end of said external piloting control device; The Enable Pin of the said drive circuit module of the first output termination; Be used for the control signal of exporting from said external piloting control device that enables is carried out sequential processing, and control the duty of said drive circuit module through said first output terminal;
The blanking module; Second output terminal of the said time-sequence control module of control termination; The output terminal of the said direct supply of input termination; Output terminal is connected with the output terminal of said drive circuit module and the control end of LED display simultaneously, is used for according to the output level of second output terminal of said time-sequence control module the stray capacitance of each alignment of LED display being charged.
2. LED display blanking control circuit as claimed in claim 1 is characterized in that, said time-sequence control module comprises:
First rejection gate, first phase inverter, first buffer, second buffer and Sheffer stroke gate;
The first input end of said first rejection gate is the input end of said time-sequence control module; The input end of said first phase inverter of output termination of said first rejection gate; The output terminal of said first phase inverter is first output terminal of said time-sequence control module; The first input end of said first rejection gate of input termination of said first buffer; The output terminal of said first buffer is connected with second input end of said first rejection gate and the input end of said second buffer simultaneously; The first input end of said Sheffer stroke gate is connected with the output terminal of said second buffer and the input end of said first buffer respectively with second input end, and the output terminal of said Sheffer stroke gate is second output terminal of said time-sequence control module.
3. LED display blanking control circuit as claimed in claim 1 is characterized in that, said time-sequence control module comprises:
Second rejection gate, second phase inverter, the 3rd buffer, the 4th buffer reach and door;
The first input end of said second rejection gate is the input end of said time-sequence control module; The input end of said second phase inverter of output termination of said second rejection gate; The output terminal of said second phase inverter is first output terminal of said time-sequence control module; The first input end of said second rejection gate of input termination of said the 3rd buffer; The output terminal of said the 3rd buffer is connected with second input end of said second rejection gate and the input end of said the 4th buffer simultaneously; Said first input end with door is connected with the output terminal of said the 4th buffer and the input end of said the 3rd buffer respectively with second input end, and said output terminal with door is second output terminal of said time-sequence control module.
4. LED display blanking control circuit as claimed in claim 1; It is characterized in that; Said blanking module comprises a plurality of PMOS pipes; The grid of said a plurality of PMOS pipes connects the control end that forms said blanking module altogether, and the source electrode of said a plurality of PMOS pipes connects the input end that forms said blanking module altogether, the common output terminal that constitutes said blanking module of drain electrode of each the PMOS pipe in said a plurality of PMOS pipes.
5. LED display blanking control circuit as claimed in claim 1; It is characterized in that; Said blanking module comprises a plurality of NMOS pipes; The grid of said a plurality of NMOS pipes connects the control end that forms said blanking module altogether, and the drain electrode of said a plurality of NMOS pipes connects the input end that forms said blanking module altogether, the common output terminal that constitutes said blanking module of source electrode of each the NMOS pipe in said a plurality of NMOS pipes.
6. LED chip for driving; It is characterized in that; Said LED chip for driving comprises drive circuit module and LED display blanking control circuit; Said LED display blanking control circuit is connected with direct supply, said drive circuit module and external piloting control device, and said LED display blanking control circuit comprises:
Time-sequence control module; Input end is connected with the enable signal end of said external piloting control device; The Enable Pin of the said drive circuit module of the first output termination; Be used for the control signal of exporting from said external piloting control device that enables is carried out sequential processing, and control the duty of said drive circuit module through said first output terminal;
The blanking module; Second output terminal of the said time-sequence control module of control termination; The output terminal of the said direct supply of input termination; Output terminal is connected with the output terminal of said drive circuit module and the control end of LED display simultaneously, is used for according to the output level of second output terminal of said time-sequence control module the stray capacitance of each alignment of LED display being charged.
7. LED chip for driving as claimed in claim 6 is characterized in that, said time-sequence control module comprises:
First rejection gate, first phase inverter, first buffer, second buffer and Sheffer stroke gate;
The first input end of said first rejection gate is the input end of said time-sequence control module; The input end of said first phase inverter of output termination of said first rejection gate; The output terminal of said first phase inverter is first output terminal of said time-sequence control module; The first input end of said first rejection gate of input termination of said first buffer; The output terminal of said first buffer is connected with second input end of said first rejection gate and the input end of said second buffer simultaneously; The first input end of said Sheffer stroke gate is connected with the output terminal of said second buffer and the input end of said first buffer respectively with second input end, and the output terminal of said Sheffer stroke gate is second output terminal of said time-sequence control module.
8. LED chip for driving as claimed in claim 6 is characterized in that, said time-sequence control module comprises:
Second rejection gate, second phase inverter, the 3rd buffer, the 4th buffer reach and door;
The first input end of said second rejection gate is the input end of said time-sequence control module; The input end of said second phase inverter of output termination of said second rejection gate; The output terminal of said second phase inverter is first output terminal of said time-sequence control module; The first input end of said second rejection gate of input termination of said the 3rd buffer; The output terminal of said the 3rd buffer is connected with second input end of said second rejection gate and the input end of said the 4th buffer simultaneously; Said first input end with door is connected with the output terminal of said the 4th buffer and the input end of said the 3rd buffer respectively with second input end, and said output terminal with door is second output terminal of said time-sequence control module.
9. LED chip for driving as claimed in claim 6; It is characterized in that; Said blanking module comprises a plurality of PMOS pipes; The grid of said a plurality of PMOS pipes connects the control end that forms said blanking module altogether, and the source electrode of said a plurality of PMOS pipes connects the input end that forms said blanking module altogether, the common output terminal that constitutes said blanking module of drain electrode of each the PMOS pipe in said a plurality of PMOS pipes.
10. LED chip for driving as claimed in claim 6; It is characterized in that; Said blanking module comprises a plurality of NMOS pipes; The grid of said a plurality of NMOS pipes connects the control end that forms said blanking module altogether, and the drain electrode of said a plurality of NMOS pipes connects the input end that forms said blanking module altogether, the common output terminal that constitutes said blanking module of source electrode of each the NMOS pipe in said a plurality of NMOS pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210045607.2A CN102592542B (en) | 2012-02-27 | 2012-02-27 | Blanking control circuit for LED (light-emitting diode) display screens and LED drive chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210045607.2A CN102592542B (en) | 2012-02-27 | 2012-02-27 | Blanking control circuit for LED (light-emitting diode) display screens and LED drive chip |
Publications (2)
| Publication Number | Publication Date |
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| CN102592542A true CN102592542A (en) | 2012-07-18 |
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| CN102779479A (en) * | 2012-08-17 | 2012-11-14 | 开源集成电路(苏州)有限公司 | LED (light-emitting diode) display system |
| CN103489408A (en) * | 2013-10-23 | 2014-01-01 | 苏州天微工业技术有限公司 | Display screen drive control circuit and display screen |
| CN103489407A (en) * | 2013-10-12 | 2014-01-01 | 深圳市大族元亨光电股份有限公司 | Non-control-lightening-free shadow elimination circuit for LED (Light Emitting Diode) display screen |
| CN103929864A (en) * | 2014-05-06 | 2014-07-16 | 深圳市绿源半导体技术有限公司 | Charge control method and device applied to LED drive circuit and LED drive circuit |
| CN104091568A (en) * | 2014-07-31 | 2014-10-08 | 无锡力芯微电子股份有限公司 | Light-emitting diode (LED) display system capable of eliminating residual shadow of LED display screen, and line scanning circuit of system |
| CN104091569A (en) * | 2014-07-31 | 2014-10-08 | 无锡力芯微电子股份有限公司 | LED display system capable of eliminating ghosting image on LED display screen and driving circuit thereof |
| CN104089675A (en) * | 2014-07-28 | 2014-10-08 | 成都千嘉科技有限公司 | Energy-saving LCD control system based on flow measurement device |
| CN105161053A (en) * | 2015-09-11 | 2015-12-16 | 深圳市明微电子股份有限公司 | Anti-streaking row-scanning control chip and anti-streaking LED display circuit |
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| CN107358913A (en) * | 2017-09-05 | 2017-11-17 | 深圳市明微电子股份有限公司 | A kind of the disappear row of shadow function of band sweeps decoding control circuit and chip |
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| CN102779479A (en) * | 2012-08-17 | 2012-11-14 | 开源集成电路(苏州)有限公司 | LED (light-emitting diode) display system |
| CN102779479B (en) * | 2012-08-17 | 2014-08-06 | 开源集成电路(苏州)有限公司 | LED (light-emitting diode) display system |
| CN103489407B (en) * | 2013-10-12 | 2015-06-03 | 深圳市大族元亨光电股份有限公司 | Non-control-lightening-free shadow elimination circuit for LED (Light Emitting Diode) display screen |
| CN103489407A (en) * | 2013-10-12 | 2014-01-01 | 深圳市大族元亨光电股份有限公司 | Non-control-lightening-free shadow elimination circuit for LED (Light Emitting Diode) display screen |
| CN103489408A (en) * | 2013-10-23 | 2014-01-01 | 苏州天微工业技术有限公司 | Display screen drive control circuit and display screen |
| CN103489408B (en) * | 2013-10-23 | 2016-04-13 | 苏州天微工业技术有限公司 | Display screen Drive and Control Circuit and display screen |
| CN103929864B (en) * | 2014-05-06 | 2015-11-25 | 深圳市绿源半导体技术有限公司 | For Charge controlled method and device, the LED drive circuit of LED drive circuit |
| CN103929864A (en) * | 2014-05-06 | 2014-07-16 | 深圳市绿源半导体技术有限公司 | Charge control method and device applied to LED drive circuit and LED drive circuit |
| CN104089675A (en) * | 2014-07-28 | 2014-10-08 | 成都千嘉科技有限公司 | Energy-saving LCD control system based on flow measurement device |
| CN104091569A (en) * | 2014-07-31 | 2014-10-08 | 无锡力芯微电子股份有限公司 | LED display system capable of eliminating ghosting image on LED display screen and driving circuit thereof |
| CN104091568A (en) * | 2014-07-31 | 2014-10-08 | 无锡力芯微电子股份有限公司 | Light-emitting diode (LED) display system capable of eliminating residual shadow of LED display screen, and line scanning circuit of system |
| CN104091568B (en) * | 2014-07-31 | 2016-05-11 | 无锡力芯微电子股份有限公司 | Can eliminate LED display system and the line-scan circuit thereof of LED display ghost |
| WO2016041309A1 (en) * | 2014-09-15 | 2016-03-24 | 西安诺瓦电子科技有限公司 | Led display control method and control card and led display screen system |
| CN105161053B (en) * | 2015-09-11 | 2017-08-11 | 深圳市明微电子股份有限公司 | A kind of anti-smear row sweeps control chip and anti-smear LED display circuit |
| CN105161053A (en) * | 2015-09-11 | 2015-12-16 | 深圳市明微电子股份有限公司 | Anti-streaking row-scanning control chip and anti-streaking LED display circuit |
| CN106251806A (en) * | 2016-09-29 | 2016-12-21 | 北京集创北方科技股份有限公司 | LED display and driving method thereof |
| CN106251806B (en) * | 2016-09-29 | 2019-04-02 | 北京集创北方科技股份有限公司 | LED display and its driving method |
| CN106710518A (en) * | 2016-12-06 | 2017-05-24 | 深圳市富满电子集团股份有限公司 | LED display and display control circuit thereof |
| CN106531064A (en) * | 2016-12-06 | 2017-03-22 | 深圳市富满电子集团股份有限公司 | LED display screen and display control circuit thereof |
| CN106683610A (en) * | 2016-12-06 | 2017-05-17 | 深圳市富满电子集团股份有限公司 | LED display screen, display control device thereof and blanking circuit |
| CN107358913A (en) * | 2017-09-05 | 2017-11-17 | 深圳市明微电子股份有限公司 | A kind of the disappear row of shadow function of band sweeps decoding control circuit and chip |
| CN108615501A (en) * | 2018-06-26 | 2018-10-02 | 深圳市富满电子集团股份有限公司 | LED display eliminates driving method, driving circuit and the LED display of ghost |
| CN108615501B (en) * | 2018-06-26 | 2024-01-16 | 富满微电子集团股份有限公司 | Driving method and driving circuit for eliminating ghosts of LED display screen and LED display screen |
| CN109192130A (en) * | 2018-07-05 | 2019-01-11 | 厦门强力巨彩光电科技有限公司 | LED display control circuit, driving chip and LED display |
| CN110599945A (en) * | 2019-08-06 | 2019-12-20 | 北京集创北方科技股份有限公司 | LED display device and driving method thereof |
| WO2021098068A1 (en) * | 2019-11-20 | 2021-05-27 | 北京集创北方科技股份有限公司 | Led display device, and driving method and chip therefor |
| US11741888B2 (en) | 2019-11-20 | 2023-08-29 | Chipone Technology (Beijing) Co., Ltd. | LED display device, driving method and chip thereof |
| WO2022127469A1 (en) * | 2020-12-17 | 2022-06-23 | 北京集创北方科技股份有限公司 | Led drive circuit and led display apparatus |
| CN112951150A (en) * | 2021-01-29 | 2021-06-11 | 深圳市明微电子股份有限公司 | Energy-saving method, device and equipment for LED display screen and storage medium |
| CN112951150B (en) * | 2021-01-29 | 2022-06-28 | 深圳市明微电子股份有限公司 | Energy-saving method, device and equipment for LED display screen and storage medium |
| CN115171598A (en) * | 2022-07-27 | 2022-10-11 | 富满微电子集团股份有限公司 | Blanking circuit and chip |
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