CN105374317A - LED display screen drive control method and drive control circuit - Google Patents
LED display screen drive control method and drive control circuit Download PDFInfo
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- CN105374317A CN105374317A CN201510919033.0A CN201510919033A CN105374317A CN 105374317 A CN105374317 A CN 105374317A CN 201510919033 A CN201510919033 A CN 201510919033A CN 105374317 A CN105374317 A CN 105374317A
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Abstract
The invention relates to the field of LEDs, in particular to an LED display screen drive control method and a drive control circuit. A conventional charge eliminating method (allowing LED lamp bead anode discharging and LED lamp bead cathode charging at the same time) is changed into a charge eliminating step in the technical scheme, and the charge eliminating step includes allowing anode discharging and cathode high resistance, anode and cathode discharging at the same time and anode high resistance and cathode charging; in a row drive time interval of driving each two rows of an LED display screen, the LED display screen is driven to complete the charge eliminating step of parasitic capacitance of scanned rows. By improving the drive mode and the drive circuit, row ghost images and column ghost images can be eliminated, and damage to LED lamp bead due to reverse breakdown voltage is avoided. The circuit is simple in structure, convenient to operate and convenient for actual application.
Description
Technical field
The present invention relates to LED field, particularly relate to a kind of LED display drived control method and Drive and Control Circuit.
Background technology
As Fig. 1, existing LED scans in the system architecture (taking advantage of the LED array of 3 for 3) of display screen owing to there is stray capacitance C11 ~ C33, CW1 ~ CW3 and CB1 ~ CB3, can there is the situation of abnormal bright spot in LED array, these abnormal bright spots are also referred to as ghost in display.In every a line LED lamp bead by ignition successively, also there is glimmer phenomenon in the LED that the vicinity of the LED of normal luminous should be luminous, is referred to as ghost.Be positioned at the abnormal luminescence of LED of normally lighting row above LED and be called row ghost, the abnormal luminescence of bottom row LED is called row ghost.
The reason producing row ghost is: when sweep trace W1 is driven, the stray capacitance CW1 on W1 is charged to the noble potential close to system power supply VDD, if do not have discharge circuit to discharge, then the noble potential on CW1 can keep a very long time to disappear.When sweep trace is entered a new line to W2 by W1, LED lamp bead D22 is lit, now the voltage of the signal wire B1 of connection LED lamp bead D22 negative electrode becomes the low level close to earthing potential, and now, negative electrode and the LED lamp bead D22 negative electrode of LED lamp bead D12 connect together, also be low level, because CW1 also remains on high level, be greater than conducting rated voltage so LED lamp bead D12 bears forward bias voltage drop instantaneously and enter conducting state, electric charge on stray capacitance CW1 can discharge on B1 by LED lamp bead D12, the abnormal luminescence of LED lamp bead D12 is caused to light, this phenomenon is referred to as row ghost.
The reason producing row ghost is: when sweep trace W1 is driven, and during signal wire B3 conducting, LED lamp bead D13 is normally lighted, stray capacitance CB3 now on signal wire B3 is in the low level close to earthing potential, if do not have charging circuit to charge, then the electronegative potential on CB3 can keep a very long time to disappear.When sweep trace is entered a new line to W2 by W1, connect the noble potential of voltage close to system power supply VDD of the sweep trace W2 of LED lamp bead D23 anode, now, even if B3 signal wire not conducting (D23 should not light in other words), because the current potential on CB3 keeps electronegative potential, LED lamp bead D23 is made to bear that forward bias voltage drop is greater than conducting rated voltage instantaneously and enter conducting state, electric current is charged to stray capacitance CB3 by LED lamp bead D23, cause the abnormal luminescence of light emitting diode D23, form the row ghost of the LED lamp bead D13 that lastrow is normally lighted.
As Fig. 2, Fig. 3, in order to eliminate row ghost and row ghost, horizontal drive circuit and column drive circuit add electric discharge and charge function respectively, because column drive circuit charging in driving process, horizontal drive circuit electric discharge adopt and carry out simultaneously, LED lamp bead two ends are caused to produce reverse voltage, namely LED lamp bead occurs that cathode voltage is greater than anode voltage, causes LED lamp bead to be damaged.
Summary of the invention
Technical matters to be solved by this invention is: provide a kind of avoid eliminate row ghost and row ghost while LED lamp bead two ends to produce reverse voltage LED display drived control method and Drive and Control Circuit.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
A kind of LED display drived control method, comprising:
Driving LED display screen carries out the row cutting step that powers on line by line;
In the row cutting time slot of every two row of driving LED display screen, driving LED display screen completes the electric charge removal process of the stray capacitance of the row of scanning; The first stray capacitance that described LED display comprises the first LED lamp bead and is connected in parallel with described first LED lamp bead;
Described electric charge removal process, comprising:
The anode discharge process of described first LED lamp bead;
The negative electrode of described first LED lamp bead, anode discharge process simultaneously;
The negative electrode charging process of described first LED lamp bead.
Another technical scheme that the present invention adopts is:
A kind of LED display Drive and Control Circuit, comprises control circuit, horizontal drive circuit and column drive circuit;
Described horizontal drive circuit and column drive circuit are electrically connected with control circuit respectively;
Described horizontal drive circuit comprises the first switch element and second switch unit;
Described control circuit is connected with the anode of the first LED lamp bead by the first switch element;
Described control circuit is connected with the anode of the first LED lamp bead by second switch unit;
Described column drive circuit comprises the 3rd switch element, the 4th switch element and the 5th switch element;
Described control circuit is connected with the negative electrode of the first LED lamp bead by the 3rd switch element;
Described control circuit is connected with the negative electrode of the first LED lamp bead by the 4th switch element;
Described control circuit is connected with the negative electrode of the first LED lamp bead by the 5th switch element;
Described control circuit, for the 3rd switch element, the 4th switch element and the 5th switch element in the first switch element, second switch unit and the column drive circuit in control lines driving circuit one by one, thus driving LED display screen carries out the row cutting that powers on line by line, and in the row cutting time slot of every two row of driving LED display screen, driving LED display screen completes the electric charge removal process of the stray capacitance of the row of scanning; The first stray capacitance that described LED display comprises the first LED lamp bead and is connected in parallel with described first LED lamp bead; Described electric charge removal process is: the anode discharge process of described first LED lamp bead; The negative electrode of described first LED lamp bead, anode discharge process simultaneously; The negative electrode charging process of described first LED lamp bead.
Beneficial effect of the present invention is: traditional electric charge removing method (LED lamp bead anode discharge and the charging of LED lamp bead negative electrode are carried out simultaneously) is changed over electric charge removal process in technical scheme of the present invention (first anode discharge, again anode and negative electrode discharge simultaneously, last negative electrode charging); Can eliminate row ghost for LED lamp bead anode discharge process, stray capacitance is in high-impedance state, and maintain ortho states, do not have driving force, therefore LED lamp bead two ends can not produce breakdown reverse voltage; LED lamp bead anode and negative electrode are discharged simultaneously, LED lamp bead both end voltage difference is only the capable shadow low level that disappears and deducts row electric discharge low level, in normal practice process, even if as long as accomplish that this voltage difference is non-negative or is negative still much smaller than the breakdown reverse voltage of LED lamp bead, just can prevent the situation of reverse breakdown, greatly improve the LED lamp bead working time, improve the functional reliability of LED lamp bead; Can eliminate row ghost for LED lamp bead negative electrode charging process, because LED lamp bead anode is in high-impedance state, not have driving force, therefore LED lamp bead two ends can not produce breakdown reverse voltage.
Accompanying drawing explanation
Fig. 1 is the system architecture schematic diagram that in background technology of the present invention, LED scans display screen;
Fig. 2 is the system architecture schematic diagram of the LED scanning display screen that in background technology of the present invention, tradition is improved;
Fig. 3 is the drive waveforms schematic diagram of the LED scanning display screen that in background technology of the present invention, tradition is improved;
Fig. 4 is the flow chart of steps of LED display drived control method of the present invention;
Fig. 5 is the schematic diagram of LED display Drive and Control Circuit of the present invention;
Fig. 6 is the drive waveforms schematic diagram of LED display Drive and Control Circuit of the present invention.
Embodiment
By describing technology contents of the present invention in detail, realized object and effect, accompanying drawing is coordinated to be explained below in conjunction with embodiment.
The design of most critical of the present invention is: (first LED lamp bead anode discharge, again LED lamp bead anode and negative electrode discharge simultaneously to perform electric charge removal process in LED display scanning line feed time gap, last LED lamp bead negative electrode charging), can not breakdown reverse voltage be produced while elimination row ghost and row ghost, keep the functional reliability of LED lamp bead.
Please refer to Fig. 4-6, a kind of LED display drived control method provided by the invention, comprising:
Driving LED display screen carries out the row cutting step that powers on line by line;
In the row cutting time slot of every two row of driving LED display screen, driving LED display screen completes the electric charge removal process of all associated parasitic electric capacity of the row of scanning; The first stray capacitance that described LED display comprises the first LED lamp bead and is connected in parallel with described first LED lamp bead;
Described electric charge removal process, comprising:
The anode discharge of described first LED lamp bead, the process of negative electrode high resistant;
The negative electrode of described first LED lamp bead, anode discharge process simultaneously;
The anode high resistant of described first LED lamp bead, negative electrode charging process.
From foregoing description, beneficial effect of the present invention is: traditional electric charge removing method (LED lamp bead anode discharge and the charging of LED lamp bead negative electrode are carried out simultaneously) is changed over electric charge removal process in technical scheme of the present invention (first anode discharge and negative electrode high resistant, again anode and negative electrode discharge simultaneously, final anode high resistant and negative electrode charging); Can eliminate row ghost for LED lamp bead anode discharge, negative electrode high resistant process, stray capacitance is in high-impedance state, and maintain ortho states, do not have driving force, therefore LED lamp bead two ends can not produce breakdown reverse voltage; LED lamp bead anode and negative electrode are discharged simultaneously, LED lamp bead both end voltage difference is only the capable shadow low level that disappears and deducts row electric discharge low level, in normal practice process, even if as long as accomplish that this voltage difference is non-negative or is negative still much smaller than the breakdown reverse voltage of LED lamp bead, just can prevent the situation of reverse breakdown, greatly improve the LED lamp bead working time, improve the functional reliability of LED lamp bead; Can eliminate row ghost for LED lamp bead anode high resistant, negative electrode charging process, because LED lamp bead anode is in high-impedance state, not have driving force, therefore LED lamp bead two ends can not produce breakdown reverse voltage.
Further, the anode discharge of described first LED lamp bead, the process of negative electrode high resistant, be specially:
The anode of described first LED lamp bead connects low level, the negative electrode open circuit (high resistant) of described first LED lamp bead.
Seen from the above description, the anode of the first LED lamp bead is connect low level, the negative electrode open circuit of the first LED lamp bead can eliminate row ghost, and stray capacitance is in high-impedance state, and maintain ortho states, do not have driving force, therefore LED lamp bead two ends can not produce breakdown reverse voltage.
Further, the negative electrode of described first LED lamp bead, anode discharge process simultaneously, be specially:
Negative electrode, the anode of described first LED lamp bead connect low level simultaneously.
Seen from the above description, LED lamp bead anode and negative electrode are discharged simultaneously, LED lamp bead both end voltage difference is only the capable shadow low level that disappears and deducts row electric discharge low level, in normal practice process, even if as long as accomplish that this voltage difference is non-negative or is negative still much smaller than the breakdown reverse voltage of LED lamp bead, just can prevent the situation of reverse breakdown, greatly improve the LED lamp bead working time, improve the functional reliability of LED lamp bead.
Further, the anode high resistant of described first LED lamp bead, negative electrode charging process, be specially:
The anode open circuit of described first LED lamp bead, the negative electrode of described first LED lamp bead connects high level.
Seen from the above description, by the anode open circuit of the first LED lamp bead, the negative electrode of the first LED lamp bead connects high level and can eliminate row ghost, and because LED lamp bead anode is in high-impedance state, do not have driving force, therefore LED lamp bead two ends can not produce breakdown reverse voltage.
A kind of LED display Drive and Control Circuit provided by the invention, comprises control circuit, horizontal drive circuit and column drive circuit;
Described horizontal drive circuit and column drive circuit are electrically connected with control circuit respectively;
Described horizontal drive circuit comprises the first switch element and second switch unit;
Described control circuit is connected with the anode of the first LED lamp bead by the first switch element; Described first switch element is for control VDD system power supply;
Described control circuit is connected with the anode of the first LED lamp bead by second switch unit; Described second switch unit is used for control lines and disappears shadow low level;
Described column drive circuit comprises the 3rd switch element, the 4th switch element and the 5th switch element;
Described control circuit is connected with the negative electrode of the first LED lamp bead by the 3rd switch element; Described 3rd switch element to disappear shadow high level for controlling row;
Described control circuit controls constant current source by the 4th switch element and is connected with the negative electrode of the first LED lamp bead; Described 4th switch element is for controlling constant current source;
Described control circuit controls row electric discharge low level by the 5th switch element and is connected with the negative electrode of the first LED lamp bead; Described 5th switch element is for controlling row electric discharge low level;
Described control circuit, for the 3rd switch element, the 4th switch element and the 5th switch element in the first switch element, second switch unit and the column drive circuit in control lines driving circuit one by one, thus driving LED display screen carries out the row cutting that powers on line by line, and in the row cutting time slot of every two row of driving LED display screen, driving LED display screen completes the electric charge removal process of the stray capacitance of the row of scanning; The first stray capacitance that described LED display comprises the first LED lamp bead and is connected in parallel with described first LED lamp bead; Described electric charge removal process is: the anode discharge of described first LED lamp bead, the process of negative electrode high resistant; The negative electrode of described first LED lamp bead, anode discharge process simultaneously; The anode high resistant of described first LED lamp bead, negative electrode charging process.
Please refer to Fig. 1-6, embodiments of the invention one are:
It should be noted that: the present embodiment arranges LED scanning array for 3 row 3;
A kind of LED display drived control method provided by the invention, comprising:
Driving LED display screen carries out the row cutting step that powers on line by line;
In the row cutting time slot of every two row of driving LED display screen, driving LED display screen completes the electric charge removal process of the stray capacitance of the row of scanning; The first stray capacitance that described LED display comprises the first LED lamp bead and is connected in parallel with described first LED lamp bead;
Described electric charge removal process, comprising:
The anode discharge of described first LED lamp bead, the process of negative electrode high resistant;
The negative electrode of described first LED lamp bead, anode discharge process simultaneously;
The anode high resistant of described first LED lamp bead, negative electrode charging process.
The LED driving control system be made up of control circuit, horizontal drive circuit and column drive circuit is obtained according to above-mentioned LED display drived control method.
Control circuit in New LED driving control system is responsible for providing various control signal to horizontal drive circuit and column drive circuit, can see in Figure 5, control circuit provides the drive control signal S1/S2/S3 of horizontal drive circuit, eliminate row ghost drive control signal D1/D2/D3, be supplied to the gray-scale Control signal F1/F2/F3 of column drive circuit, eliminate row ghost drive control signal J1, row electric discharge drive singal K1.
Horizontal drive circuit in New LED driving control system, be made up of multiple LED row cutting element circuit, LED row cutting element circuit, has controlled switch 1 (being the first switch element), controlled switch 2 (being second switch unit), the capable shadow low level that disappears, VDD system power supply, control signal 1 (being S1), control signal 2 (being D1) to form respectively.Conducting and the disconnection suspension control signal 1 of controlled switch 1 control, and when control signal 1 is high level, controlled switch 1 conducting, when control signal 1 is low level, controlled switch 1 disconnects.Conducting and the disconnection suspension control signal 2 of controlled switch 2 control, and when control signal 2 is high level, controlled switch 2 conducting, when control signal 2 is low level, controlled switch 2 disconnects.
The capable shadow low level that disappears is a low level signal, for disconnecting at controlled switch 1, controlled switch 2 conducting time, to W1 drive sweep trace and sweep trace on stray capacitance discharge, stray capacitance on sweep trace and sweep trace is pulled down to the capable shadow low level that disappears, row ghost can be eliminated like this.
VDD system power supply is used for when controlled switch 1 conducting, controlled switch 2 disconnect, drive the sweep trace on W1 and the stray capacitance on sweep trace, LED lamp bead anode level now on this sweep trace is VDD system power supply, if row driving is opened, this LED lamp bead is lighted.
Control signal 1 and control signal 2 are sent by control circuit, controls controlled switch 1 and controlled switch 2 respectively.
Column drive circuit in novel LED drive system, be made up of multiple LED array driver element circuit, LED array driver element circuit, have respectively controlled switch 3 (being the 3rd switch element), controlled switch 4 (being the 4th switch element), controlled switch 5 (being the 5th switch element), row disappear shadow high level, row electric discharge low level, constant current source, systematically, control signal 3 (being J1), control signal 4 (being F1/F2/F3), control signal 5 (being K1) form.Conducting and the disconnection suspension control signal 3 of controlled switch 3 control, and when control signal 3 is high level, controlled switch 3 conducting, when control signal 3 is low level, controlled switch 3 disconnects.Conducting and the disconnection suspension control signal 4 of controlled switch 4 control, and when control signal 4 is high level, controlled switch 4 conducting, when control signal 4 is low level, controlled switch 4 disconnects.Conducting and the disconnection suspension control signal 5 of controlled switch 5 control, and when control signal 5 is high level, controlled switch 5 conducting, when control signal 5 is low level, controlled switch 5 disconnects.
Arranging the shadow high level that disappears is a high level signal, for when controlled switch 3 conducting, controlled switch 4 and controlled switch 5 disconnect, to B1/B2/B3 drive alignment and alignment on stray capacitance CB1/CB2/CB3 charge, by alignment and on stray capacitance draw high row and to disappear shadow high level, row ghost can be eliminated like this.
Row electric discharge low level is a low level signal, for when controlled switch 5 conducting, controlled switch 3 and controlled switch 4 disconnect, to B1/B2/B3 drive alignment and alignment on stray capacitance discharge, by alignment and on stray capacitance be pulled down to row electric discharge low level, the spurious charge on LED lamp bead negative electrode can be eliminated like this.
Constant current source and systematically, for when controlled switch 4 conducting, controlled switch 3 and controlled switch 5 disconnect, according to the gray scale drive singal that control signal 4 adds, to B1/B2/B3 drive alignment and alignment on stray capacitance carry out constant current drive light, complete normal LED lamp bead Presentation Function.
As system diagram and Fig. 3 oscillogram of Fig. 2, the horizontal drive circuit of traditional LED display driving control system and elimination row ghost and row ghost and column drive circuit, can cause two important adverse effects;
First is: during t2 ~ t3, D11/D12/D13 there will be a reverse pressure drop, the i.e. negative electrode of D11/D12/D13 then alignment, at this moment because J1 is high level, alignment can be pulled to row and to disappear shadow high level, and the anode of D11/D12/D13 is received on W1, now B1/B2/B3 is high level, and W1 can be discharged into very low level (the capable shadow low level that disappears).Such D11/D12/D13 there will be cathode voltage and is greater than the so a kind of state of anode voltage.In the reverse pressure drop situation of this appearance, due to instability or the defect of LED lamp bead production technology, be easy to LED lamp bead reverse breakdown, cause permanent, expendable damage, we are referred to as dead lamp phenomenon.
Second is: t2 to t3 during this period of time in, owing to there is reverse pressure drop, C11/C12/C13 there will be reverse charge accumulated, that is, C11/C12/C13 bottom crown (connecting the place of alignment) is positive charge, C11/C12/C13 top crown (connecting the place of line) is negative charge, like this upper once light D11/D12/D13 time, first the top crown of C11/C12/C13 must be charged to positive charge, bottom crown discharges into negative potential, LED lamp bead could normally be lighted, need the longer time, these are due to the impact of spurious charge, cause and increase the additional charge time, greatly will affect the display response speed of LED lamp bead, cause gray scale display loss.And if C11/C12/C13 capacitance there are differences, then can cause the inconsistent of gray scale display loss, the display effect of whole LED display there will be inconsistent phenomenon.
In order to solve above-mentioned two kinds of adverse effects, a kind of LED display drived control method that the present invention proposes.
As shown in Figure 5, the present invention proposes a kind of LED display Drive and Control Circuit, with the traditional column drive circuit shown in Fig. 2, adds a controlled switch 5, control signal 5, row electric discharge low level.
The present invention proposes a kind of LED display Drive and Control Circuit, wherein, control circuit provides number control signal to control horizontal drive circuit and column drive circuit, control signal comprises S1 ~ S3 (row cutting control signal), D1 ~ D3 (the capable shadow discharge signal that disappears), F1 ~ F3 (row drive gray-scale Control signal), J1 (row disappear shadow control signal), K1 (row drive discharge signal), then these control signals control LED horizontal drive circuit, LED array driving circuit respectively.
In figure 6, t1 to t2 during this period of time, is called the first row displaying time.As can see from Figure 5, now S1 is high level, W1 outputting drive voltage, F1/F2/F3 is according to the content of gradation data simultaneously, start controlled switch 14, controlled switch 24, controlled switch 34 carries out turn-on and turn-off control, thus D11/D12/D13 can show different time spans, CW1 stray capacitance can charge to high level simultaneously, according to displaying contents, these three stray capacitances of CB1/CB2/CB3 can occur that situation about dragging down is (as long as the conducting during this period of controlled switch 15/ controlled switch 25/ controlled switch 35, level will be dragged down), as long as and stray capacitance C11/C12/C13 controlled switch 15/ controlled switch 25/ controlled switch 35 conducting during this period on lamp pearl, forward spurious charge will be had at electric capacity two ends, that is stray capacitance connects LED lamp bead positive polarity one end is positive charge, connecting LED lamp bead negative polarity one end is negative charge.And now S2/S3 is low level, W2/W3 does not have driving voltage, so these LED lamp bead of D21/D22/D23/D31/D32/D33 all can not be lighted;
From t2 to t2 ' be the horizontal drive circuit discharge time in scanning line feed time during this period of time, namely row ghost eliminates the stage.Now:
1, in order to eliminate the spurious charge in CW1 stray capacitance, avoid the row ghost occurred, S1 is that low level controlled switch 11 turns off, parting system power drives W1, meanwhile, D1 is high level, open controlled switch 12, the stray capacitance CW1 on W1 is discharged, discharge into the capable shadow low level that disappears;
2, F1/F2/F3 is low level, and controlled switch 14/ controlled switch 24/ controlled switch 34 all turns off, and like this, LED array driving circuit turns off gray scale Presentation Function; Now, on traditional LED lamp pearl, occur breakdown reverse voltage, controlled switch 13/ controlled switch 23/ controlled switch 33 that J1 controls can not be opened, so in the inventive solutions, J1 is low at this moment, and controlled switch 13/ controlled switch 23/ controlled switch 33 is all in off state; Meanwhile, K1 is low level, and controlled switch 15/ controlled switch 25/ controlled switch 35 that K1 controls is closed;
3, now the state of LED lamp bead D11/D12/D13 and stray capacitance C11/C12/C13 is, W1 discharges to D11/D12/D13 positive polarity and stray capacitance C11/C12/C13, and alignment B1/B2/B3 and stray capacitance CB1/CB2/CB3 is in high-impedance state, maintain ortho states, do not have driving force, therefore now D11/D12/D13 two ends do not have reverse voltage.
Be the LED lamp bead capacitor discharge time scanning line feed time during this period of time from t2 ' to t3, now:
1, in order to eliminate the spurious charge in CW1 stray capacitance, avoid the row ghost occurred, S1 is that low level controlled switch 11 turns off, parting system power drives W1, meanwhile, D1 is high level, open controlled switch 12, the stray capacitance CW1 on W1 is discharged, discharge into the capable shadow low level that disappears;
2, F1/F2/F3 is low level, and controlled switch 14/ controlled switch 24/ controlled switch 34 all turns off, and like this, LED array driving circuit turns off gray scale Presentation Function; Now, on traditional LED lamp pearl, occur reverse voltage, controlled switch 13/ controlled switch 23/ controlled switch 33 that J1 controls can not be opened, so inside patent of the present invention, J1 is low at this moment, and controlled switch 13/ controlled switch 23/ controlled switch 33 is all in off state; Simultaneously, K1 is high level, controlled switch 15/ controlled switch 25/ controlled switch 35 conducting that K1 controls, and starts alignment B1/B2/B3 and stray capacitance CB1/CB2/CB3, and LED lamp bead stray capacitance C11/C12/C12 negative pole discharges, discharge into row electric discharge low level;
3, now the state of D11/D12/D13 and stray capacitance C11/C12/C13 is, W1 proceeds electric discharge to D11/D12/D13 positive polarity and stray capacitance C11/C12/C13 positive polarity, discharge into the capable shadow low level that disappears, and alignment B1/B2/B3 and stray capacitance CB1/CB2/CB3 is also in discharge condition, discharge into row electric discharge low level, now D11/D12/D13 both end voltage difference is only the capable shadow low level that disappears and deducts row electric discharge low level, as long as can accomplish that this voltage difference is just, or be zero, again or for negative still much smaller than the breakdown reverse voltage of LED lamp bead, LED lamp bead can be well protected to occur the situation of reverse breakdown, greatly improve the LED lamp bead working time, improve the functional reliability of LED lamp bead, can be set as smaller numerical value owing to going to disappear shadow low level and arrange the low level voltage difference of electric discharge, like this, would not there is reversed charge in LED lamp bead, solves the larger reverse spurious charge that in classic method, LED lamp bead occurs, affect display effect simultaneously.
Be the alignment in scanning line feed time and stray capacitance duration of charging during this period of time from t3 to t4, namely row ghost eliminates the time.Now:
1, S1 is low level, and controlled switch 11 turns off, parting system power drives W1, and meanwhile, D1 is also low level, turns off controlled switch 12, and the stray capacitance CW1 level now on W1 has been put to going the shadow low level that disappears, and keeps high-impedance state;
2, F1/F2/F3 is low level, and controlled switch 14/ controlled switch 24/ controlled switch 34 all turns off, and like this, LED array driving circuit turns off gray scale Presentation Function; Now, J1 is high level, and controlled switch 13/ controlled switch 23/ controlled switch 33 is all in conducting state, now, stray capacitance CB1/CB2/CB3 on alignment B1/B2/B3 and alignment can be driven, and charges to row and to disappear shadow high level, achieves the row shadow that disappears and eliminates function; Meanwhile, K1 is low level, and controlled switch 15/ controlled switch 25/ controlled switch 35 that K1 controls is closed;
3, now the state of D11/D12/D13 and stray capacitance C11/C12/C13 is, W1 is in high-impedance state to D11/D12/D13 positive polarity and stray capacitance C11/C12/C13, and alignment B1/B2/B3 and stray capacitance CB1/CB2/CB3 is in charged state, be charged to row to disappear shadow high level, now D11/D12/D13 two ends, positive polarity is in high resistant, negative polarity is in row and disappears shadow high level, because positive polarity is in high-impedance state, there is no driving force, so do not become the reverse drive voltages of LED lamp bead, there will not be the situation of LED lamp bead reverse breakdown, keep the functional reliability of LED lamp bead.
Below just complete the display of first scan line, disappear the ghost course of work, follow-up second, the 3rd scan line repeats above process.
In sum, a kind of LED display drived control method provided by the invention and Drive and Control Circuit, traditional electric charge removing method (LED lamp bead anode discharge and the charging of LED lamp bead negative electrode are carried out simultaneously) is changed over electric charge removal process in technical scheme of the present invention (first anode discharge and negative electrode high resistant, again anode and negative electrode discharge simultaneously, final anode high resistant and negative electrode charging); For LED lamp bead anode discharge and negative electrode high resistant process can eliminate row ghost, stray capacitance is in high-impedance state, and maintain ortho states, do not have driving force, therefore LED lamp bead two ends can not produce breakdown reverse voltage; LED lamp bead anode and negative electrode are discharged simultaneously, LED lamp bead both end voltage difference is only the capable shadow low level that disappears and deducts row electric discharge low level, in normal practice process, even if as long as accomplish that this voltage difference is non-negative or is negative still much smaller than the breakdown reverse voltage of LED lamp bead, just can prevent the situation of reverse breakdown, greatly improve the LED lamp bead working time, improve the functional reliability of LED lamp bead; For LED lamp bead anode high resistant and negative electrode charging process can eliminate row ghost, because LED lamp bead anode is in high-impedance state, do not have driving force, therefore LED lamp bead two ends can not produce breakdown reverse voltage.Can on the basis of eliminating row ghost and row ghost by the improvement of type of drive and driving circuit, the LED lamp bead avoiding generation breakdown reverse voltage to cause is damaged, and circuit structure is simple, easy to operate, is convenient to practical application.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every equivalents utilizing instructions of the present invention and accompanying drawing content to do, or be directly or indirectly used in relevant technical field, be all in like manner included in scope of patent protection of the present invention.
Claims (5)
1. a LED display drived control method, is characterized in that, comprising:
Driving LED display screen carries out the row cutting step that powers on line by line;
In the row cutting time slot of every two row of driving LED display screen, driving LED display screen completes the electric charge removal process of the stray capacitance of the row of scanning; The first stray capacitance that described LED display comprises the first LED lamp bead and is connected in parallel with described first LED lamp bead;
Described electric charge removal process, comprising:
The anode discharge process of described first LED lamp bead;
The negative electrode of described first LED lamp bead, anode discharge process simultaneously;
The negative electrode charging process of described first LED lamp bead.
2. LED display drived control method according to claim 1, is characterized in that, the anode discharge process of described first LED lamp bead, is specially:
The anode of described first LED lamp bead connects low level, the negative electrode open circuit of described first LED lamp bead.
3. LED display drived control method according to claim 1, is characterized in that, the negative electrode of described first LED lamp bead, anode discharge process simultaneously, be specially:
Negative electrode, the anode of described first LED lamp bead connect low level simultaneously.
4. LED display drived control method according to claim 1, is characterized in that, the negative electrode charging process of described first LED lamp bead, is specially:
The anode open circuit of described first LED lamp bead, the negative electrode of described first LED lamp bead connects high level.
5. a LED display Drive and Control Circuit, is characterized in that, comprises control circuit, horizontal drive circuit and column drive circuit;
Described horizontal drive circuit and column drive circuit are electrically connected with control circuit respectively;
Described horizontal drive circuit comprises the first switch element and second switch unit;
Described control circuit is connected with the anode of the first LED lamp bead by the first switch element;
Described control circuit is connected with the anode of the first LED lamp bead by second switch unit;
Described column drive circuit comprises the 3rd switch element, the 4th switch element and the 5th switch element;
Described control circuit is connected with the negative electrode of the first LED lamp bead by the 3rd switch element;
Described control circuit is connected with the negative electrode of the first LED lamp bead by the 4th switch element;
Described control circuit is connected with the negative electrode of the first LED lamp bead by the 5th switch element;
Described control circuit, for the 3rd switch element, the 4th switch element and the 5th switch element in the first switch element, second switch unit and the column drive circuit in control lines driving circuit one by one, thus driving LED display screen carries out the row cutting that powers on line by line, and in the row cutting time slot of every two row of driving LED display screen, driving LED display screen completes the electric charge removal process of the stray capacitance of the row of scanning; The first stray capacitance that described LED display comprises the first LED lamp bead and is connected in parallel with described first LED lamp bead; Described electric charge removal process is: the anode discharge process of described first LED lamp bead; The negative electrode of described first LED lamp bead, anode discharge process simultaneously; The negative electrode charging process of described first LED lamp bead.
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Application publication date: 20160302 |