CN105825806A - LED display drive system, control method and LED display - Google Patents
LED display drive system, control method and LED display Download PDFInfo
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- CN105825806A CN105825806A CN201610350229.7A CN201610350229A CN105825806A CN 105825806 A CN105825806 A CN 105825806A CN 201610350229 A CN201610350229 A CN 201610350229A CN 105825806 A CN105825806 A CN 105825806A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
Abstract
The invention discloses an LED display drive system, a control method and an LED display. The system comprises a lamp bead detection circuit which is used for detecting the working state (open-circuit or short-circuit) of the lamp beads in an LED display system, a line shadow elimination control circuit which is electrically connected with the lamp bead detection circuit and used for generating control information according to the working state of the lamp beads, and a line shadow elimination circuit which is electrically connected with the line shadow elimination control circuit and used for making the shadow elimination potential rise or fall according to the control information generated by the line shadow elimination control circuit. The technical problem in the prior art that mistaken switching on-off of other lamp beads due to open circuit or short circuit of an LED lamp bead in the LED display system cannot be solved at the same time is solved.
Description
Technical field
The present invention relates to display screen field, in particular to a kind of LED display driving system, control method and LED display.
Background technology
Fig. 1 is the structural representation of a kind of display screen according to prior art, Fig. 2 be a kind of display screen according to prior art go switching time potential change schematic diagram.When going switching, current potential V1, V2 on line 1, line 2 are as shown in Figure 2.Shown in Fig. 1 and Fig. 2, understand that row smear Producing reason: the LED drive chip in Fig. 1 includes PMOS switch pipe, due to the opening of PMOS switch pipe, close and charge discharging resisting in line parasitic capacitance is required to a period of time, in fig. 2 in the diagram t time period, the current potential of V1, V2 all be enough to light the LED of this row.Therefore, it will be seen that in the case of display screen line scanning is, when the second row starts luminescence, the first row still has a certain degree of the brightest on the LED display not having the capable shadow circuit that disappears.
In order to solve above-mentioned row smear problem, can set about from system, be expert at switching time, reserved one period of buffer time, even if the first row PMOS switch pipe complete switches off and after charge discharging resisting in parasitic capacitance, again the PMOS switch pipe of the second row is opened, in line current potential such as Fig. 2 shown in V1 ', V2 ', so in the case of display screen line scanning is, when the second row starts luminescence, the most there is not the first row still in the t time period of luminous situation, can effectively solve row smear problem.
But, in a practical situation, owing on line, electric capacity is bigger, about 2nF, if only releasing the electric charge on electric capacity by LED, it may be desirable to longer row switching buffer time, this is unfavorable for the raising of refresh rate.Generally, system can reserve the row switching time of 1 μ s.
It is thus desirable to add pull-down circuit in the LED line driving chip (PMOS), be expert at switching time, the electric charge in parasitic capacitance is quickly released.It is the lowest that drop-down current potential is arranged, charge discharging resisting in parasitic capacitance the most, and the row shadow effect that disappears is the best.So, under the cooperation of system and chip, just can solve row smear problem.
In the case of row smear problem in solving LED display, when the lamp bead on LED display is damaged and is caused lamp bead open circuit or short circuit, other lamp bead that this lamp bead is expert at or arranges can be affected and produce the brightest of mistake, it is rendered as the shape of bar or cross, industry internal normally referred to as cross or caterpillar.
Existing technical scheme, on the whole display screen being equipped with caterpillar scheme line driving chip (PMOS) that disappears, normally working when, the short-circuit caterpillar of the most fixed elimination or elimination open circuit caterpillar (i.e. can not individually solve open a way caterpillar or the short-circuit caterpillar of independent solution), therefore when the solution of prior art is the scheme eliminating open circuit caterpillar, short circuit caterpillar can not be solved simultaneously, when solution is the scheme eliminating short circuit caterpillar, it is impossible to solve open circuit caterpillar simultaneously.
The bright dark problem of other lamp bead mistakes caused due to LED lamp bead open circuit and short circuit for LED display system in prior art can not be solved the technical problem that simultaneously, the most not yet proposes effective solution.
Summary of the invention
Embodiments provide a kind of LED display driving system, control method and LED display, at least to solve the bright dark technical problem of other lamp bead mistakes that LED display system of the prior art causes due to LED lamp bead open circuit or short circuit.
An aspect according to embodiments of the present invention, it is provided that a kind of LED display driving system, including: lamp bead testing circuit, for detecting the duty of lamp bead in LED display system, duty includes: open circuit or short circuit；The capable shadow control circuit that disappears, electrically connects with lamp bead testing circuit, generates control information for the duty according to lamp bead；Row disappears shadow circuit, and the shadow control circuit that disappears with row electrically connect, for being raised and lowered, according to the row control information control that shadow control circuit generates that disappears, the shadow current potential that disappears.
Another aspect according to embodiments of the present invention, additionally provide the control method of a kind of LED display driving system, LED display driving system includes: lamp bead testing circuit, shadow control circuit and the shadow circuit that disappears of going of disappearing of going, the control method of LED display driving system includes: described lamp bead testing circuit detects the duty of lamp bead in described LED display system, wherein, described duty includes: open circuit or short circuit；The described row shadow control circuit that disappears generates control information according to the duty of described lamp bead；The described row shadow circuit that disappears is raised and lowered, according to described control information, the shadow current potential that disappears.
Another aspect according to embodiments of the present invention, additionally provides a kind of LED display, and LED display includes any one LED display driving system in above-described embodiment.
nullIt can thus be appreciated that，The application such scheme is by adjusting the capable shadow current potential that disappears，Guarantee when lamp bead open circuit or short circuit，Need not the voltage at lamp bead two ends the lighted threshold voltage less than lamp bead，So that it is guaranteed that there is not the lamp bead that mistake is the brightest，Simultaneously，Owing to have employed lamp bead testing circuit to detect lamp bead state，And use the capable shadow control circuit that disappears to control to go the shadow circuit that disappears，The shadow current potential that disappears row is adjusted，The shadow current potential that disappears at once both can be heightened according to the control of the capable shadow control circuit that disappears，Can also turn down according to the control of the capable shadow circuit that disappears，And the disappear control signal of shadow control circuit of row obtains according to the short circuit of lamp bead or the state of open circuit，The i.e. present invention passes through adaptive circuit,The state of LED lamp bead can be detected in real time，Adaptive elimination open circuit caterpillar or short circuit caterpillar，Therefore the technical problem that the application such scheme can solve to be opened a way by lamp bead simultaneously and other lamp bead mistakes caused by lamp bead short circuit are the brightest.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of a kind of display screen according to prior art；
Fig. 2 be a kind of display screen according to prior art go switching time potential change schematic diagram；
Fig. 3 is the structural representation of a kind of LED display driving system according to embodiments of the present invention；
Fig. 4 is according to a structural representation during lamp bead short circuit in a kind of display screen of prior art；
Fig. 5 be according to display screen in the case of a kind of lamp bead short circuit in display screen of prior art go switching time potential change schematic diagram；
Structural representation when Fig. 6 is to open a way according to a lamp bead in a kind of display screen of prior art；
Fig. 7 is the structural representation of a kind of LED display driving system according to the present invention；And
Fig. 8 is the flow chart of the control method of a kind of LED display driving system according to the present invention.
Detailed description of the invention
In order to make those skilled in the art be more fully understood that the present invention program, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a present invention part rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, all should belong to the scope of protection of the invention.
It should be noted that term " first " in description and claims of this specification and above-mentioned accompanying drawing, " second " etc. are for distinguishing similar object, without being used for describing specific order or precedence.Should be appreciated that the data of so use can be exchanged in the appropriate case, in order to embodiments of the invention described herein can be implemented with the order in addition to those here illustrating or describing.In addition, term " includes " and " having " and their any deformation, it is intended to cover non-exclusive comprising, such as, contain series of steps or the process of unit, method, system, product or equipment be not necessarily limited to those steps or the unit clearly listed, but can include the most clearly listing or for intrinsic other step of these processes, method, product or equipment or unit.
Embodiment 1
According to embodiments of the present invention, it is provided that the embodiment of a kind of LED display driving system, Fig. 3 is the structural representation of a kind of LED display driving system according to embodiments of the present invention, as it is shown on figure 3, this LED display driving system includes:
Lamp bead testing circuit 30, for detecting the duty of lamp bead in LED display system, described duty includes: open circuit or short circuit.
When lamp bead in LED display system breaks down, the row or column at meeting therefore fault lamp bead place can produce the brightest of mistake.Under normal circumstances, the fault of lamp bead is divided into open fault and short trouble two kinds.
Fig. 4 is according to a structural representation during lamp bead short circuit in a kind of display screen of prior art, in a kind of optional embodiment, in conjunction with Fig. 4 example, lamp bead LED1 is short-circuited fault in this example, hence in so that form path between LED2 and ground, whether lamp bead testing circuit can detect LED1 by whether forming path between detection LED2 and ground is short-circuited fault.
Structural representation when Fig. 6 is to open a way according to a lamp bead in a kind of display screen of prior art, in a kind of optional embodiment, in conjunction with Fig. 6 example, there is open fault in lamp bead LED1 in this example so that LED drive chip is disconnected by the path of LED1 to constant-current source.
Herein it should be noted that lamp bead testing circuit is revealed in any detection method that above-described embodiment provides, all can apply in the present invention for detecting the circuit of duty, equipment or the module of each lamp bead in LED display.
The capable shadow control circuit 32 that disappears, electrically connects with lamp bead testing circuit, generates control information for the duty according to lamp bead.
The above-mentioned shadow control circuit that disappears is connected with lamp bead testing circuit, in the case of lamp bead testing circuit detects that in LED display, lamp bead breaks down, the capable shadow control circuit that disappears detects the lamp bead state obtained according to lamp bead testing circuit, generates the control information corresponding with the duty of lamp bead.
Row disappears shadow circuit 34, and the shadow control circuit that disappears with row electrically connect, for being raised and lowered, according to the row control information control that shadow control circuit generates that disappears, the shadow current potential that disappears.
Eliminate owing to the short circuit of lamp bead or open fault cause the brightest problem of other lamp bead mistakes to further illustrate the present invention, below in conjunction with the lamp bead short circuit shown in Fig. 4 to Fig. 6 or the schematic diagram of open circuit, the reason that the short circuit of lamp bead or open circuit cause the mistake of other lamp bead the brightest is described:
In the case of screen is completely black, if LED1 is short-circuit, be equivalent to access a wire at LED1 two ends, in the case of this display screen goes switching, in switching tube in LED line driving chip, the row of the first row shadow circuit that disappears starts drop-down for line current potential V1, the switching tube of the second row starts to open at, during this, the current potential of V1 is pulled down to set current potential VREF, and V2 point current potential rises to power supply potential VDD (the startup voltage that LED drive chip provides), then the pressure drop on LED2 is VDD-VREF (difference starting voltage and the shadow current potential that disappears that LED drive chip provides), in the above-described embodiments,
When VDD-VREF is more than the threshold voltage of LED2, LED2 will be lit, and now LED2 should not be lit, thus, it can be known that when being more than the threshold voltage of LED2 as VDD-VREF, the mistake that the short circuit of LED1 causes other lamp bead gone together with LED1 lamp bead is the brightest, wherein, above-mentioned threshold voltage is the minimum voltage that can light LED2, and under normal conditions, the multiple lamp bead included at a LED display have identical threshold voltage.
When VDD-VREF is less than the threshold voltage of LED2, LED2 will not be lit, thus, it can be known that when when the VDD-VREF threshold voltage less than LED2, the short circuit of LED1 does not cause goes together with LED1 lamp bead or the mistake of other lamp bead of same column is the brightest.
When LED1 needs to light, constant-current source chip provides pull-down current to left side the first alignment, and the switching tube in LED line driving chip provides supply voltage to line 1.
If opened a way due to LED1 in the case of LED1 open circuit, the current potential V1 of the first alignment can be pulled down to GND (hold) by constant-current source chip, and the current potential of alignment 2 to be the switching tube row in LED line driving chip the disappear current potential VREF set by shadow circuit.
When VREF is more than LED2 threshold voltage, LED2 can be lit, and now LED2 should not be lit, thus, it can be known that when being more than the threshold voltage of LED2 as VREF, the open circuit of LED1 causes the brightest with the mistake of other lamp bead of LED1 lamp bead same column.
When VREF is less than LED2 threshold voltage, LED2 will not be lit, thus, it can be known that when VREF is less than the threshold voltage of LED2, the open circuit of LED1 does not cause goes together with LED1 lamp bead or the mistake of other lamp bead of same column is the brightest.
Should be noted that herein and be: owing to the capable shadow circuit that disappears not is to work always, but decontrol after pulling down to arrange current potential VREF, therefore, the energy lighting LED2 is provided by parasitic capacitance, during so while the mistake of other lamp bead that the open circuit of lamp bead causes is lighted, the brightness lighted is the highest.
In one optional embodiment, the LED display of the use present invention powers on when showing, the present invention can initialize solution open circuit caterpillar, if having LED to open a way on now shielding, the place the most only opened a way in LED produces dim spot, will not produce caterpillar；When LED short circuit occurs on display screen when, understand and adjust the capable shadow current potential that disappears by the present invention, the most only can produce a bright spot (when that the constant-current source only connect at the negative electrode of the LED of short circuit being opened the local of LED short circuit, do not work during blank screen), do not produce undercoat caterpillar, so open circuit caterpillar or short circuit caterpillar can adaptive be eliminated, promote display effect, reduce display screen maintenance cost.
nullIt can thus be appreciated that，The application such scheme is by adjusting the capable shadow current potential that disappears，Guarantee when lamp bead open circuit or short circuit，Need not the voltage at lamp bead two ends the lighted threshold voltage less than lamp bead，So that it is guaranteed that there is not the lamp bead that mistake is the brightest，Simultaneously，Owing to have employed lamp bead testing circuit to detect lamp bead state，And use the capable shadow control circuit that disappears to control to go the shadow circuit that disappears，The shadow current potential that disappears row is adjusted，The shadow current potential that disappears at once both can be heightened according to the control of the capable shadow control circuit that disappears，Can also turn down according to the control of the capable shadow circuit that disappears，And the disappear control signal of shadow control circuit of row obtains according to the short circuit of lamp bead or the state of open circuit，The i.e. present invention passes through adaptive circuit,The state of LED lamp bead can be detected in real time，Adaptive elimination open circuit caterpillar or short circuit caterpillar，Therefore the technical problem that the application such scheme can solve to be opened a way by lamp bead simultaneously and other lamp bead mistakes caused by lamp bead short circuit are the brightest.
Optionally, according to the above embodiment of the present invention, the row shadow control circuit that disappears is additionally operable to when the duty of lamp bead is for short circuit, controls the row shadow circuit that disappears and raises, and when the duty of lamp bead is for open circuit, controls the row shadow circuit that disappears and reduces row and disappear shadow current potential.
Still the embodiment shown in Fig. 4 to Fig. 6 is combined, be could be aware that by above-described embodiment, when lamp bead is short-circuited fault, when the VDD-VREF needing other lamp bead is less than the threshold voltage of lamp bead, fault lamp bead would not cause the brightest of other lamp bead mistakes, and the startup voltage that VDD provides as driving chip is changeless, therefore, can use and improve the disappear method of shadow current potential of row to guarantee the VDD-VREF of other lamp bead threshold voltage less than lamp bead, from without producing the brightest of mistake.
In a kind of optional embodiment, in conjunction with the example shown in Fig. 4, V1 is pulled down to VREF just make the row shadow circuit that disappears quit work if arranged, once the capable shadow current potential that disappears arranges relatively low, during row switching, before V1 pulled down to VREF, LED2 will be lit, path " VDD → line 2 → LED2 → line 1 → capable shadow circuit → GND that disappears " is made to reach stable, the capable shadow circuit that disappears will be always maintained at work, LED2 is provided energy by power supply, when the lamp bead lighted by mistake normally works with display screen, brightness is consistent, be could be aware that by above-mentioned example, the caterpillar phenomenon that lamp bead short circuit causes can be eliminated by improving the capable shadow circuit that disappears.
When lamp bead generation open fault, when the VREF needing other lamp bead is less than the threshold voltage of lamp bead, fault lamp bead would not cause the brightest of other lamp bead mistakes, therefore, can use reduce row disappear shadow current potential method to guarantee other lamp bead VREF less than the threshold voltage of lamp bead, from without producing the brightest of mistake.
As the optional mode of one, if testing result is lamp bead short circuit, then this result can be latched by the LED row shadow control circuit that disappears, and immutable, by the relatively low shadow current potential that disappears, the capable shadow current potential that disappears is transferred to the higher shadow circuit that disappears simultaneously.
From the foregoing, it will be observed that in the application such scheme, the row shadow control circuit that disappears is additionally operable to when the duty of lamp bead is for short circuit, controls the row shadow current potential that disappears and raises, and when the duty of lamp bead is for open circuit, controls the row shadow current potential that disappears and reduces.Such scheme is by the duty according to the lamp bead detected, to carrying out the adjustment corresponding with duty, thus solve the bright dark problem of other lamp bead mistakes that in prior art, LED display system causes due to LED lamp bead open circuit and short circuit and can not be solved the technical problem that simultaneously.
Optionally, according to the above embodiment of the present invention, said system also includes:
Switching tube, electrically connects with lamp bead testing circuit and lamp bead, and being used for controlling DC source is that lamp bead is powered.
Optionally, according to the above embodiment of the present invention, said system also includes:
DC source, electrically connects with switching tube, for when switching tube turns on, powers for lamp bead.
Optionally, according to the above embodiment of the present invention, when the duty in lamp bead is short circuit, controlling the row shadow circuit that disappears and raise the shadow current potential that disappears to the first current potential, wherein, the potential difference of power supply and the first current potential is less than the turn-on threshold voltage of lamp bead；When the duty of lamp bead is for open circuit, controlling the row shadow circuit that disappears and reduce the shadow current potential that disappears to the second current potential, wherein, the second current potential is less than the turn-on threshold voltage of lamp bead.
Optionally, according to the above embodiment of the present invention, above-mentioned switching tube includes: PMOS.
Herein it should be noted that above-mentioned switching tube can be PMOS, but it is not limited to PMOS.
nullIn a kind of optional embodiment，In conjunction with the example shown in Fig. 7，VDD is the driving power supply in LED drive chip，When LED display switches over，The VDD control by PMOS switch pipe，Power for the lamp bead in display screen，Wherein，VDD is connected with lamp bead testing circuit by PMOS switch pipe，And be connected in OUT terminal，Lamp bead in OUT terminal UI display screen is connected，So that lamp bead testing circuit can detect the duty of lamp bead，The capable shadow control circuit that disappears is connected with lamp bead testing circuit，The duty of the lamp bead for obtaining according to the detection of lamp bead testing circuit controls to go the shadow circuit that disappears，The capable shadow circuit that disappears then raises according to control or reduces the capable shadow current potential that disappears，Thus solve the bright dark problem of other lamp bead mistakes that in prior art, LED display system causes due to LED lamp bead open circuit and short circuit and can not be solved the technical problem that simultaneously.
Embodiment 2
According to embodiments of the present invention, provide the embodiment of the control method of a kind of LED display driving system, it should be noted that, can perform in the computer system of such as one group of computer executable instructions in the step shown in the flow chart of accompanying drawing, and, although showing logical order in flow charts, but in some cases, can be to be different from the step shown or described by order execution herein.
Fig. 8 is the control method of LED display driving system according to embodiments of the present invention, and the capable shadow current potential LED display driving system that disappears includes: lamp bead testing circuit, shadow control circuit and the shadow circuit that disappears of going of disappearing of going, as shown in Figure 8, the method comprises the steps:
Step S802, the duty of lamp bead in lamp bead testing circuit detection LED display system, wherein, duty includes: open circuit or short circuit.
Step S804, the shadow control circuit that disappears generates control information according to the duty of lamp bead.
Step S806, the capable shadow circuit that disappears is raised and lowered the capable shadow current potential that disappears according to control information.
In one optional embodiment, the LED display of the use present invention powers on when showing, the present invention can initialize solution open circuit caterpillar, if having LED to open a way on now shielding, the place the most only opened a way in LED produces dim spot, will not produce caterpillar；When LED short circuit occurs on display screen when, understand and adjust the capable shadow current potential that disappears by the present invention, the most only can produce a bright spot (when that the constant-current source only connect at the negative electrode of the LED of short circuit being opened the local of LED short circuit, do not work during blank screen), do not produce undercoat caterpillar, so open circuit caterpillar or short circuit caterpillar can adaptive be eliminated, promote display effect, reduce the maintenance cost of display screen.
nullIt can thus be appreciated that，The application above-mentioned steps is by adjusting the capable shadow current potential that disappears，Guarantee when lamp bead open circuit or short circuit，Need not the voltage at lamp bead two ends the lighted threshold voltage less than lamp bead，So that it is guaranteed that there is not the lamp bead that mistake is the brightest，Simultaneously，Owing to have employed lamp bead testing circuit to detect lamp bead state，And use the capable shadow control circuit that disappears to control to go the shadow circuit that disappears，The shadow current potential that disappears row is adjusted，The shadow current potential that disappears at once both can be heightened according to the control of the capable shadow control circuit that disappears，Can also turn down according to the control of the capable shadow circuit that disappears，And the disappear control signal of shadow control circuit of row obtains according to the short circuit of lamp bead or the state of open circuit，The i.e. present invention passes through adaptive circuit,The state of LED lamp bead can be detected in real time，Adaptive elimination open circuit caterpillar or short circuit caterpillar，Therefore the technical problem that the application such scheme can solve to be opened a way by lamp bead simultaneously and other lamp bead mistakes caused by lamp bead short circuit are the brightest.
Optionally, according to the above embodiments of the present application, step S802, the step that the capable shadow circuit that disappears is raised and lowered the shadow current potential that disappears according to control information includes:
Step S8021, when the duty in lamp bead is short circuit, controls the capable shadow circuit that disappears and raises the shadow current potential that disappears.
Step S8023, when the duty of lamp bead is for open circuit, controls the row shadow circuit that disappears and reduces and disappear shadow current potential.
Still the embodiment shown in Fig. 4 to Fig. 6 is combined, be could be aware that by above-described embodiment, when lamp bead is short-circuited fault, when the VDD-VREF needing other lamp bead is less than the threshold voltage of lamp bead, fault lamp bead would not cause the brightest of other lamp bead mistakes, and the startup voltage that VDD provides as driving chip is changeless, therefore, can use and improve the disappear method of shadow current potential of row to guarantee the VDD-VREF of other lamp bead threshold voltage less than lamp bead, from without producing the brightest of mistake.
In a kind of optional embodiment, in conjunction with the example shown in Fig. 4, V1 is pulled down to VREF just make the row shadow circuit that disappears quit work if arranged, once the capable shadow current potential that disappears arranges relatively low, during row switching, before V1 pulled down to VREF, LED2 will be lit, path " VDD → line 2 → LED2 → line 1 → capable shadow circuit → GND that disappears " is made to reach stable, the capable shadow circuit that disappears will be always maintained at work, LED2 is provided energy by power supply, when the lamp bead lighted by mistake normally works with display screen, brightness is consistent, be could be aware that by above-mentioned example, the caterpillar phenomenon that lamp bead short circuit causes can be eliminated by improving the capable shadow circuit that disappears.
When lamp bead generation open fault, when the VREF needing other lamp bead is less than the threshold voltage of lamp bead, fault lamp bead would not cause the brightest of other lamp bead mistakes, therefore, can use reduce row disappear shadow current potential method to guarantee other lamp bead VREF less than the threshold voltage of lamp bead, from without producing the brightest of mistake.
As the optional mode of one, if testing result is lamp bead short circuit, then this result can be latched by the LED row shadow control circuit that disappears, and immutable, by the relatively low shadow current potential that disappears, the capable shadow current potential that disappears is transferred to the higher shadow circuit that disappears simultaneously.
From the foregoing, it will be observed that in the application such scheme, the row shadow control circuit that disappears is additionally operable to when the duty of lamp bead is for short circuit, controls the row shadow current potential that disappears and raises, and when the duty of lamp bead is for open circuit, controls the row shadow current potential that disappears and reduces.Such scheme is by the duty according to the lamp bead detected, to carrying out the adjustment corresponding with duty, thus solve the bright dark problem of other lamp bead mistakes that in prior art, LED display system causes due to LED lamp bead open circuit and short circuit and can not be solved the technical problem that simultaneously.
Optionally, according to the above embodiments of the present application, step S8021, control the capable shadow circuit that disappears and raise the shadow current potential that disappears, including:
Step S8025, controls the row shadow circuit that disappears and raises the shadow current potential that disappears to the first current potential, and wherein, the DC source in LED display driving system is less than the turn-on threshold voltage of lamp bead with the potential difference of the first current potential.
Optionally, according to the above embodiments of the present application, step S8023, control the capable shadow circuit that disappears and reduce the shadow current potential that disappears, including:
Step S8027, controls the row shadow circuit that disappears and reduces the shadow current potential that disappears to the second current potential, and wherein, the second current potential is less than the turn-on threshold voltage of lamp bead.
Embodiment 3
According to embodiments of the present invention, it is provided that a kind of LED display, above-mentioned LED display includes the middle any one LED display driving system in embodiment 1.
nullOwing to the embodiment of the present application 1 proposing LED display driving system by adjusting the capable shadow current potential that disappears，Guarantee when lamp bead open circuit or short circuit，Need not the voltage at lamp bead two ends the lighted threshold voltage less than lamp bead，So that it is guaranteed that there is not the lamp bead that mistake is the brightest，Simultaneously，Owing to have employed lamp bead testing circuit to detect lamp bead state，And use the capable shadow control circuit that disappears to control to go the shadow circuit that disappears，The shadow current potential that disappears row is adjusted，The shadow current potential that disappears at once both can be heightened according to the control of the capable shadow control circuit that disappears，Can also turn down according to the control of the capable shadow circuit that disappears，And the disappear control signal of shadow control circuit of row obtains according to the short circuit of lamp bead or the state of open circuit，The i.e. present invention passes through adaptive circuit,The state of LED lamp bead can be detected in real time，Adaptive elimination open circuit caterpillar or short circuit caterpillar，Therefore the technical problem that the application such scheme can solve to be opened a way by lamp bead simultaneously and other lamp bead mistakes caused by lamp bead short circuit are the brightest，In the case of LED display one of which that thus the application is proposed or the fault that multiple lamp bead is short-circuited and/or opens a way，Do not have the lamp bead that other mistakes are the brightest.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
In the above embodiment of the present invention, the description to each embodiment all emphasizes particularly on different fields, and does not has the part described in detail, may refer to the associated description of other embodiments in certain embodiment.
In several embodiments provided herein, it should be understood that disclosed technology contents, can realize by another way.Wherein, device embodiment described above is only schematically, the division of the most described unit, can be that a kind of logic function divides, actual can have other dividing mode when realizing, the most multiple unit or assembly can in conjunction with or be desirably integrated into another system, or some features can be ignored, or does not performs.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be the INDIRECT COUPLING by some interfaces, unit or module or communication connection, can be being electrical or other form.
The described unit illustrated as separating component can be or may not be physically separate, and the parts shown as unit can be or may not be physical location, i.e. may be located at a place, or can also be distributed on multiple unit.Some or all of unit therein can be selected according to the actual needs to realize the purpose of the present embodiment scheme.
It addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it is also possible to be that unit is individually physically present, it is also possible to two or more unit are integrated in a unit.Above-mentioned integrated unit both can realize to use the form of hardware, it would however also be possible to employ the form of SFU software functional unit realizes.
If described integrated unit is using the form realization of SFU software functional unit and as independent production marketing or use, can be stored in a computer read/write memory medium.Based on such understanding, completely or partially can embodying with the form of software product of part that prior art is contributed by technical scheme the most in other words or this technical scheme, this computer software product is stored in a storage medium, including some instructions with so that a computer equipment (can be for personal computer, server or the network equipment etc.) performs all or part of step of method described in each embodiment of the present invention.And aforesaid storage medium includes: USB flash disk, read only memory (ROM, Read-OnlyMemory), the various media that can store program code such as random access memory (RAM, RandomAccessMemory), portable hard drive, magnetic disc or CD.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (11)
1. a LED display driving system, it is characterised in that including:
Lamp bead testing circuit, for detecting the duty of lamp bead in LED display system, described duty includes: open circuit or short circuit；
The capable shadow control circuit that disappears, electrically connects with described lamp bead testing circuit, generates control information for the duty according to described lamp bead；
Row disappears shadow circuit, and the shadow control circuit that disappears with described row electrically connect, for being raised and lowered, according to the described control information control that shadow control circuit generates that disappears of described row, the shadow current potential that disappears.
System the most according to claim 1, it is characterised in that
The described row shadow control circuit that disappears is additionally operable to when the duty of described lamp bead is described short circuit, control described row disappear shadow circuit raise described in disappear shadow current potential, when the duty in described lamp bead is described open circuit, control described row disappear shadow circuit reduce described in disappear shadow current potential.
System the most according to claim 2, it is characterised in that described system also includes:
Switching tube, electrically connects with described lamp bead testing circuit and described lamp bead, and being used for controlling DC source is that described lamp bead is powered.
System the most according to claim 3, it is characterised in that described system also includes:
Described DC source, electrically connects with described switching tube, for when described switching tube turns on, powers for described lamp bead.
System the most according to claim 4, it is characterised in that
When duty in described lamp bead is described short circuit, control described row disappear shadow circuit raise described in the shadow current potential that disappears to the first current potential, wherein, the potential difference of described DC source and described first current potential is less than the turn-on threshold voltage of described lamp bead；
When duty in described lamp bead is described open circuit, control described row disappear shadow circuit reduce described in the shadow current potential that disappears to the second current potential, wherein, described second current potential is less than the turn-on threshold voltage of described lamp bead.
System the most according to claim 5, it is characterised in that described switching tube includes: PMOS.
7. the control method of a LED display driving system, it is characterised in that described LED display driving system includes:
Lamp bead testing circuit, shadow control circuit and the shadow circuit that disappears of going of disappearing of going, wherein, described method includes:
The duty of lamp bead in described lamp bead testing circuit detection LED display system, wherein, described duty includes: open circuit or short circuit；
The described row shadow control circuit that disappears generates control information according to the duty of described lamp bead；
The described row shadow circuit that disappears is raised and lowered, according to described control information, the shadow current potential that disappears.
Method the most according to claim 7, it is characterised in that the described row shadow circuit that disappears is raised and lowered, according to described control information, the shadow current potential that disappears, including:
When duty in described lamp bead is described short circuit, control described row disappear shadow circuit raise described in disappear shadow current potential；
When duty in described lamp bead is described open circuit, control described row disappear shadow circuit reduce described in disappear shadow current potential.
Method the most according to claim 8, it is characterised in that control described row disappear shadow circuit raise described in disappear shadow current potential, including:
Control described row disappear shadow circuit raise described in the shadow current potential that disappears to the first current potential, wherein, the potential difference of the DC source in described LED display driving system and described first current potential is less than the turn-on threshold voltage of described lamp bead.
Method the most according to claim 8, it is characterised in that control described row disappear shadow circuit reduce described in disappear shadow current potential, including:
Control described row disappear shadow circuit reduce described in the shadow current potential that disappears to the second current potential, wherein, described second current potential is less than the turn-on threshold voltage of described lamp bead.
11. 1 kinds of LED displays, it is characterised in that described LED display includes any one LED display driving system in claim 1 to 6.
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