CN107170406B - Drive circuit and drive current control method - Google Patents
Drive circuit and drive current control method Download PDFInfo
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- CN107170406B CN107170406B CN201710623244.9A CN201710623244A CN107170406B CN 107170406 B CN107170406 B CN 107170406B CN 201710623244 A CN201710623244 A CN 201710623244A CN 107170406 B CN107170406 B CN 107170406B
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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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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of El Displays (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Led Devices (AREA)
Abstract
The invention provides a driving circuit and a driving current control method, and relates to the technical field of light emitting diode driving. The driving circuit is used for driving a passive light emitting diode matrix circuit, and the passive light emitting diode matrix circuit comprises a plurality of light emitting diodes distributed in a matrix. The driving circuit includes a current source, a processor, and a control circuit including a plurality of first control switches and a plurality of second control switches. The processor adjusts the current source to output current in the current period according to the difference value between the total current flowing through the light-emitting diodes which are lighted in the current period and the total current flowing through the light-emitting diodes which are lighted in the previous period, so that the brightness of the light-emitting diodes which are lighted in the current period is the same as the brightness of the light-emitting diodes which are lighted in the previous period. Through the arrangement, the problem of poor brightness caused by different potentials of the cathodes when the light-emitting diodes in each row are lighted in the conventional passive light-emitting diode matrix circuit can be solved.
Description
Technical field
The present invention relates to light emitting diode actuation techniques fields, in particular to a kind of driving circuit and driving current
Control method.
Background technique
With the improper development of display technology, people also increasingly pay close attention to the display effect of display.Existing technology
In, light emitting diode is usually used, display operation is carried out to content to be displayed under the driving of driving voltage or driving current.
In the application circuit of more light emitting diode, passive type dot matrix LEDs circuit is extensive due to simple structure
Applied to all trades and professions.
In passive type dot matrix LEDs circuit, pass through after the cathode connection with each light emitting diode of a line
Corresponding first control switch is connected to ground, by right therewith after the anode connection of each light emitting diode of same row
The second control switch answered is connect with the current source, the control of each first control switch and each second control switch
End is connect with the output end of the processor respectively.
Through inventor the study found that passive type dot matrix LEDs circuit is generally adopted by electric current driving, and driving
It will form impedance ground between the cathode and ground of the light emitting diode of each row in dynamic process.The hair for needing to be lit due to each row
Optical diode generally has the characteristics that quantity is different, will lead to the electric current difference that each row flows through ground, so as to cause shining for each row
The current potential of the cathode of diode is different, so cause the light emitting diode of each row when being lit because of the voltage level of compression of cathode not
There are problems that luminance difference together.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of driving circuit and driving current control method, it is existing to solve
In some passive type dot matrix LEDs circuits when the light emitting diode of each row is lit the current potential of cathode it is different due to exist
The problem of luminance difference.
To achieve the above object, the embodiment of the present invention adopts the following technical scheme that
A kind of driving circuit, for driving passive type dot matrix LEDs circuit, the passive type light emitting diode square
Battle array circuit includes multiple light emitting diodes in matrix distribution.The driving circuit includes current source, processor and control circuit,
The control circuit includes multiple first control switches and multiple second control switches.
Connected with after the cathode connection of each light emitting diode of a line by corresponding first control switch and ground
It connects, passes through corresponding second control switch and the current source after the anode connection of each light emitting diode of same row
The control terminal of connection, each first control switch and each second control switch connects with the output end of the processor respectively
It connects.
The processor is sequentially turned on for controlling each first control switch, and the first control for controlling and being currently connected
Each second control switch conducting of the connection of system switch and the light emitting diode connection for needing to be lit so that it is described need by
The light emitting diode lighted is lit.
The processor is also used to according to the total current for flowing through each light emitting diode that present period is lit and before flowing through
The difference of the total current for each light emitting diode that one period was lit, adjust the output electric current of the current source present period so that
The brightness for each light emitting diode that present period is lit is identical as the brightness of each light emitting diode that the previous period is lit.
In the embodiment of the present invention preferably selects, in the above drive circuit, the driving circuit further includes multiple electricity
Flow collector, the output end of each current collector connect with the input terminal of the processor respectively, and respectively with it is each described
Light emitting diode is arranged in a one-to-one correspondence.
Each current collector is used to acquire the electric current of corresponding light emitting diode, and by the corresponding electricity of the electric current
Flow valuve is sent to the processor, and the processor is also used to be obtained according to the current value received to flow through present period and be lit
Each light emitting diode total current.
In the embodiment of the present invention preferably selects, in the above drive circuit, the current source be it is multiple, respectively and respectively
The second control switch connection.
Each current source be respectively used to by be attached thereto the second control switch conducting when to it is corresponding shine two
Pole pipe exports electric current.
On the basis of the above, the embodiment of the invention also provides a kind of driving current control methods, are applied to above-mentioned driving
Circuit is to drive passive type dot matrix LEDs circuit, which comprises
Obtain flow through the total current of each light emitting diode that present period is lit with flow through the previous period be lit it is each
The difference of the total current of light emitting diode；
The total current that each light emitting diode that present period is lit is flowed through according to difference adjustment, so that present period quilt
The brightness for each light emitting diode lighted is identical as the brightness of each light emitting diode that the previous period is lit.
It is described according to the difference tune in above-mentioned driving current control method in the embodiment of the present invention preferably selects
Rectify be lit through present period each light emitting diode total current the step of include:
The electric current for each light emitting diode output that current source is lit to present period is adjusted according to the difference.
It is described according to the difference tune in above-mentioned driving current control method in the embodiment of the present invention preferably selects
The step of electric current of each light emitting diode pipe that whole current source is lit to present period output includes；
According to the difference, judgement flows through the total current for each light emitting diode that present period is lit and flows through the previous period
The size of the total current for each light emitting diode being lit；
The total current for flowing through each light emitting diode that present period is lit be less than flow through the previous period be lit it is each
When the total current of light emitting diode, controlling the current source reduces each light emitting diode pipe output being lit to present period
Electric current；
The total current for flowing through each light emitting diode that present period is lit be greater than flow through the previous period be lit it is each
When the total current of light emitting diode, controls the current source and increase each light emitting diode pipe output being lit to present period
Electric current.
In the embodiment of the present invention preferably selects, in above-mentioned driving current control method, the current source be it is multiple,
The current value that each current source is exported in the same period is identical, described to adjust current source to present period by point according to the difference
The step of electric current of bright each light emitting diode pipe output includes:
The electricity for each light emitting diode output that each current source is lit to present period is adjusted separately according to the difference
Stream.
In the embodiment of the present invention preferably selects, in above-mentioned driving current control method, the driving circuit is also wrapped
Multiple current collectors are included, the output end of each current collector is connect with the input terminal of the processor respectively, and respectively
It is arranged in a one-to-one correspondence with each light emitting diode, the total current for flowing through each light emitting diode that present period is lit can
To be obtained by following steps:
The electric current for receiving each light emitting diode of each current collector acquisition, obtains multiple current values；
Obtained multiple current values are overlapped, obtain described flowing through each light emitting diode that present period is lit
Total current.
In the embodiment of the present invention preferably selects, in above-mentioned driving current control method, flows through and work as in the acquisition
The total current for each light emitting diode that the preceding period is lit and the total current for flowing through each light emitting diode that the previous period is lit
Difference the step of before, the method also includes:
It controls each first control switch to sequentially turn on, and controls and connect and need with the first control switch be currently connected
Each second control switch conducting of the light emitting diode to be lit connection, so that the light-emitting diodes for needing to be lit
Pipe is lit.
In the embodiment of the present invention preferably selects, in above-mentioned driving current control method, the control each described the
The step of one control switch sequentially turns on include:
Each first control switch is controlled successively to be connected within the preset period according to preset sequence.
Driving circuit provided by the invention and driving current control method, by obtain flow through present period be lit it is each
The difference of the total current of light emitting diode and the total current for flowing through each light emitting diode that the previous period is lit, and according to the difference
The output electric current of value adjustment current source present period, can solve in existing passive type dot matrix LEDs circuit because of each row
Light emitting diode cathode when being lit current potential it is different and there are problems that luminance difference.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, preferred embodiment is cited below particularly, and cooperate
Appended attached drawing, is described in detail below.
Detailed description of the invention
Fig. 1 is the structural block diagram of driving circuit provided in an embodiment of the present invention.
Fig. 2 is the application schematic diagram of driving circuit provided in an embodiment of the present invention.
Fig. 3 is the flow diagram of driving current control method provided in an embodiment of the present invention.
Fig. 4 is the flow diagram of step S110 in Fig. 3.
Fig. 5 is the flow diagram of step S130 in Fig. 3.
Fig. 6 is the function relation figure of the electric current i and brightness B of light emitting diode provided in an embodiment of the present invention.
Icon: 100- driving circuit；120- current source；140- processor；160- control circuit；The first control switch of S1-；
The second control switch of S2-；180- current collector；200- passive type dot matrix LEDs circuit；D- light emitting diode；R0-
Impedance ground.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment only
It is a part of the embodiments of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings
The component of embodiment can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiment of the present invention provided in the accompanying drawings is not intended to limit below claimed
The scope of the present invention, but be merely representative of selected embodiment of the invention.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without creative efforts belongs to the model that the present invention protects
It encloses.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.In description of the invention
In, term " first ", " second " etc. are only used for distinguishing description, and should not be understood as only or imply relative importance.
As depicted in figs. 1 and 2, the embodiment of the invention provides a kind of driving circuits 100, for driving passive type luminous two
Pole pipe matrix circuit 200.The passive type dot matrix LEDs circuit 200 may include multiple in luminous the two of matrix distribution
Pole pipe D, the driving circuit 100 may include current source 120, processor 140 and control circuit 160.
Further, in the present embodiment, the control circuit 160 may include multiple first control switch S1 and multiple
Second control switch S2.It is opened with after the cathode connection of each light emitting diode D of a line by corresponding first control
It closes S1 to be connected to ground, passes through corresponding second control switch after the anode connection of each light emitting diode D of same row
S2 is connect with the current source 120, the control terminal difference of each first control switch S1 and each second control switch S2
It is connect with the output end of the processor 140.
The processor 140 is sequentially turned on for controlling each first control switch S1, and is controlled and be currently connected
Each second control switch S2 conducting for the light emitting diode D connection that first control switch S1 connection and needs are lit, with
The light emitting diode D for being lit the needs is lit.The processor 140 is also used to be lit according to flowing through present period
Each light emitting diode D total current with flow through each light emitting diode D that the previous period is lit total current difference, adjustment
The output electric current of 120 present period of current source so that the brightness for each light emitting diode D that present period is lit with it is previous
The brightness for each light emitting diode D that period is lit is identical.
Optionally, in the passive type dot matrix LEDs circuit 200 each light emitting diode D specific distribution mode
Unrestricted, for example, it can be pass through corresponding the after connecting the cathode of each light emitting diode D of same row
One control switch S1 is connected to ground, and passes through corresponding second after the anode connection with each light emitting diode D of a line
Control switch S2 is connect with the current source 120.
Optionally, the concrete type of the first control switch S1 and the second control switch S2 are unrestricted, can be with
It is, but it is brilliant to be not limited to triode, Metal Oxide Semiconductor Field Effect Transistor, thyristor, silicon carbide transistor, gallium nitride
Body pipe, high electron mobility transistor and insulated gate bipolar transistor.
Optionally, the processor 140 obtains the dress for flowing through the total current for each light emitting diode D that present period is lit
It sets unrestricted.In the present embodiment, the driving circuit 100 can also include multiple current collectors 180.Each electric current
The output end of collector 180 is connect with the input terminal of the processor 140 respectively, and respectively with each light emitting diode D mono-
One is correspondingly arranged.
Each current collector 180 is used to acquire the electric current of corresponding light emitting diode D, and the electric current is corresponding
Current value be sent to the processor 140, the processor 140 is also used to obtain flowing through according to the current value received current
The total current for each light emitting diode D that period is lit.
Optionally, the concrete form of the current collector 180 is unrestricted, either with the passive type luminous two
Pole pipe matrix circuit 200 is separately positioned and the current transformer that is detected by electromagnetic induction, and it is described passive to be also possible to be set to
Current detector in formula dot matrix LEDs circuit 200 can also be other electrical components that can detecte electric current.At this
It in embodiment, is not specifically limited, is configured according to actual needs.
Optionally, the quantity of the current source 120 and set-up mode are unrestricted, can also be with for example, either multiple
One, if meet the same period flow through it is identical with the electric current of each light emitting diode D of a line.In the current source
120 for it is multiple when, for guarantee be lit with each light emitting diode D of a line when brightness it is identical, each current source 120
The electric current of output is identical.The current source 120 be one when, since the parameter of each light emitting diode D is identical, according to point
Principle is flowed, the electric current for flowing through each light emitting diode D with a line is also identical.In the present embodiment, the current source 120 is
It is multiple, it is connect respectively with each second control switch S2.Each current source 120 is respectively used to by be attached thereto
Electric current is exported to corresponding light emitting diode D when two control switch S2 are connected.
In conjunction with Fig. 3, the embodiment of the present invention also provides a kind of driving current control method, applied to above-mentioned driving circuit
100, to drive the passive type dot matrix LEDs circuit 200.Step defined in the related process of the method can be with
It is realized by the processor 140.Detailed process shown in Fig. 3 will be described in detail below.
Step S110 obtains the total current for flowing through each light emitting diode D that present period is lit and flows through the previous period
The difference of the total current for each light emitting diode D being lit.
Optionally, the mode for obtaining the total current for flowing through each light emitting diode D that present period is lit is unrestricted, root
It is different according to the particular circuit configurations and the electrical component that includes of the driving circuit 100 and have different modes, for example, it may be
Directly acquire the output current value of the current source 120.In the present embodiment, the driving circuit 100 may include multiple electricity
Collector 180 is flowed, the output end of each current collector 180 is connect with the input terminal of the processor 140 respectively, and respectively
It is arranged in a one-to-one correspondence with each light emitting diode D.It is in the present embodiment, described to flow through what present period was lit in conjunction with Fig. 4
The total current of each light emitting diode D can be obtained by step S111 and step S113.
Step S111 receives the electric current for each light emitting diode D that each current collector 180 acquires, obtains more
A current value.
In the present embodiment, each current collector 180 is used to acquire the electricity of corresponding light emitting diode D in real time
Stream, and the corresponding current value of the electric current is sent to the processor 140.The processor 140 is for receiving each electric current
Collector 180 send current value and storage, to carry out the processing of next step.
Obtained multiple current values are overlapped by step S113, obtain described flowing through each hair that present period is lit
The total current of optical diode D.
In the present embodiment, it due to being grounded after the cathode connection of each light emitting diode D of same a line, flows in the row
Enter the total current of each light emitting diode D that the electric current i.e. row present period on ground is lit.
Step S130 flows through the total current for each light emitting diode D that present period is lit according to difference adjustment, so that
The brightness for each light emitting diode D that present period is lit is identical as the brightness of each light emitting diode D that the previous period is lit.
Optionally, in the present embodiment, the total current for each light emitting diode D that present period is lit is flowed through described in adjustment
Mode it is unrestricted, for example, it may be adjusting the output electric current of the current source 120, be also possible in each light emitting diode D
Cathode and connect a current input circuit with improve flow into ground electric current, realize increase light emitting diode D cathode current potential mesh
, or each light emitting diode D cathode and connect an earthed circuit, it is luminous to realize by principle that total impedance in parallel reduces
The purpose that the current potential of diode D cathode reduces.It in the present embodiment, is the simplicity for guaranteeing the driving circuit 100, described
The step of flowing through the total current for each light emitting diode D that present period is lit according to difference adjustment includes: according to the difference tune
The electric current for each light emitting diode D output that whole current source 120 is lit to present period.
Optionally, the specific mode for adjusting the output electric current of the current source 120 is unrestricted.Assuming that the previous period has
100 light emitting diode D are lit, and the electric current for flowing through each light emitting diode D is i1, then flow through what the previous period was lit
The total current I of each light emitting diode D1=100i1If present period there are 50 light emitting diode D to be lit, each hair is flowed through
The electric current of optical diode D remains as i1, then the total current I for each light emitting diode D that present period is lit is flowed through2=50i1, by
In each light emitting diode D in earth-continuity, an impedance ground R0 will form, be respectively in the electric current for flowing through impedance ground R0
100i1And 50i1When, the current potential that will lead to each light emitting diode D cathode that the previous period is lit is lit higher than present period
Each light emitting diode D cathode current potential, and then by the brightness for each light emitting diode D that the previous period is lit occur lower than working as
The brightness of each light emitting diode D of preceding period, can choose at this time reduce flow through the electric current of each light emitting diode D of present period with
Reduce the brightness of corresponding light emitting diode D.In conjunction with Fig. 5, in the present embodiment, can by step S131, step S133 and
Step S135 adjusts the output electric current of the current source 120.
Step S131, according to the difference, judgement flows through the total current and stream for each light emitting diode D that present period is lit
The size of the total current for each light emitting diode D that a premenstrual period is lit.
Step S133 is less than in the total current for flowing through each light emitting diode D that present period is lit and flows through the previous period
When the total current for each light emitting diode D being lit, control the current source 120 reduce be lit to present period it is each shine
The electric current of diode D pipe output.
Step S135 is greater than in the total current for flowing through each light emitting diode D that present period is lit and flows through the previous period
When the total current for each light emitting diode D being lit, control the current source 120 increase be lit to present period it is each shine
The electric current of diode D output.
Optionally, when specifically adjusting the output electric current of the current source 120, the amplitude of adjustment is unrestricted, can be with
It is configured according to the characteristics of luminescence (ratio of electric current and brightness) of the light emitting diode D of selection, as shown in Figure 6.
In the present embodiment, due to the current source 120 be it is multiple, what each current source 120 was exported in the same period
Current value is identical.The mode for adjusting the electric current that the current source 120 exports, which may is that, adjusts separately each electricity according to the difference
The electric current for each light emitting diode D output that stream source 120 is lit to present period.
Further, in the present embodiment, before step S110, the method also includes: each first control of control
System switch S1 is sequentially turned on, and controls the light emitting diode for connecting with the first control switch S1 be currently connected and needing to be lit
Each second control switch S2 conducting of D connection.
In this example, it is assumed that the light emitting diode D for needing to be lit in the first row is 100, then the first row is controlled
Corresponding control switch conducting, so that the cathode of each light emitting diode D of the first row be connected to ground, and control and row need
100 the second control switch S2 conducting of the anode connection for the 100 light emitting diode D to be lit, so that 100 hairs
The anode of optical diode D is connected to the current source 120, to light 100 light emitting diode D.
Optionally, the mode that each first control switch S1 is sequentially turned on is unrestricted, either in a cycle
Interior random is respectively turned on each first control switch S1 sequentially in time, is also possible to send out according to from the passive type
The direction of 200 side of photodiode array circuit to the other side is respectively turned on corresponding first control according to regular hour sequence
Switch S1.It in the present embodiment, is the effect for improving display, the processor 140 controls each first control switch S1 and presses
It is successively connected within the preset period according to preset sequence.
Optionally, the specific duration of preset period is unrestricted, as long as meeting in each first control switch
The frequency that S1 recycles conducting is greater than the visual frequency (46HZ) of human eye.
In conclusion driving circuit 100 provided by the invention and driving current control method, when flowing through current by obtaining
The total current of each light emitting diode D that section is lit and the total current that flows through each light emitting diode D that the previous period is lit
Difference, and according to the output electric current of difference adjustment 120 present period of current source, it can solve existing passive type light-emitting diodes
In pipe matrix circuit 200 when the light emitting diode D of each row is lit the current potential of cathode it is different due to there are problems that luminance difference.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of driving circuit, for driving passive type dot matrix LEDs circuit, the passive type dot matrix LEDs
Circuit include it is multiple in matrix distribution light emitting diode, which is characterized in that the driving circuit include current source, processor and
Control circuit, the control circuit include multiple first control switches and multiple second control switches；
It is connected to ground with after the cathode connection of each light emitting diode of a line by corresponding first control switch, together
It is connect by corresponding second control switch with the current source after the anode connection of each light emitting diode of one column,
The control terminal of each first control switch and each second control switch is connect with the output end of the processor respectively；
The processor is sequentially turned on for controlling each first control switch, and is controlled and opened with the first control be currently connected
Each second control switch for the light emitting diode connection that connection connects and needs to be lit is connected, so that the needs are lit
Light emitting diode be lit；
When the processor is also used to according to the total current for flowing through each light emitting diode that present period is lit and flows through previous
The difference of the total current for each light emitting diode that section is lit adjusts the output electric current of the current source present period so that current
The brightness for each light emitting diode that period is lit is identical as the brightness of each light emitting diode that the previous period is lit.
2. driving circuit according to claim 1, which is characterized in that the driving circuit further includes multiple current acquisitions
The output end of device, each current collector is connect with the input terminal of the processor respectively, and respectively with it is each it is described shine two
Pole pipe is arranged in a one-to-one correspondence；
Each current collector is used to acquire the electric current of corresponding light emitting diode, and by the corresponding current value of the electric current
Be sent to the processor, the processor be also used to be obtained flowing through according to the current value received present period be lit it is each
The total current of light emitting diode.
3. driving circuit according to claim 1 or 2, which is characterized in that the current source be it is multiple, respectively with it is each described
The connection of second control switch；
Each current source be respectively used to by the second control switch conducting being attached thereto to corresponding light emitting diode
Export electric current.
4. a kind of driving current control method, applied to driving circuit described in claim 1-3 to drive passive type luminous two
Pole pipe matrix circuit, which is characterized in that the described method includes:
It obtains and flows through the total current of each light emitting diode that present period is lit and each shine with flow through that the previous period is lit
The difference of the total current of diode；
The total current that each light emitting diode that present period is lit is flowed through according to difference adjustment, so that present period is lit
Each light emitting diode brightness it is identical as the brightness of each light emitting diode that the previous period is lit.
5. driving current control method according to claim 4, which is characterized in that described flowed through according to difference adjustment is worked as
The step of total current for each light emitting diode that the preceding period is lit includes:
The electric current for each light emitting diode output that current source is lit to present period is adjusted according to the difference.
6. driving current control method according to claim 5, which is characterized in that described to adjust current source according to the difference
Be lit to present period each light emitting diode output electric current the step of include；
According to the difference, judgement flows through the total current for each light emitting diode that present period is lit and flows through the previous period by point
The size of the total current of bright each light emitting diode；
It is less than flow through that the previous period is lit each in the total current for flowing through each light emitting diode that present period is lit to shine
When the total current of diode, controlling the current source reduces the electric current for each light emitting diode output being lit to present period；
It is greater than flow through that the previous period is lit each in the total current for flowing through each light emitting diode that present period is lit to shine
When the total current of diode, the electric current that the current source increases each light emitting diode output being lit to present period is controlled.
7. driving current control method according to claim 5, which is characterized in that the current source be it is multiple, it is each described
The current value that current source is exported in the same period is identical, it is described according to the difference adjust current source be lit to present period it is each
Light emitting diode output electric current the step of include:
The electric current for each light emitting diode output that each current source is lit to present period is adjusted separately according to the difference.
8. driving current control method according to claim 4, which is characterized in that the driving circuit further includes multiple electricity
Flow collector, the output end of each current collector connect with the input terminal of the processor respectively, and respectively with it is each described
Light emitting diode is arranged in a one-to-one correspondence, the total current for flowing through each light emitting diode that present period is lit can by with
Lower step obtains:
The electric current for receiving each light emitting diode of each current collector acquisition, obtains multiple current values；
Obtained multiple current values are overlapped, the total electricity for flowing through each light emitting diode that present period is lit is obtained
Stream.
9. driving current control method according to claim 4, which is characterized in that flow through present period quilt in the acquisition
The total current for each light emitting diode lighted and the difference for the total current for flowing through each light emitting diode that the previous period is lit
Before step, the method also includes:
Each first control switch is controlled to sequentially turn on, and control connect with the first control switch be currently connected and need by
Each second control switch conducting for the light emitting diode connection lighted, so that the light emitting diode quilt for needing to be lit
It lights.
10. driving current control method according to claim 9, which is characterized in that each first control of control
Switching the step of sequentially turning on includes:
Each first control switch is controlled successively to be connected within the preset period according to preset sequence.
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| CN107170406B true CN107170406B (en) | 2019-08-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1289111A (en) * | 2000-10-11 | 2001-03-28 | 上海大学 | Drive circuit for passive light emitting device |
| CN100496172C (en) * | 2006-02-13 | 2009-06-03 | 盛群半导体股份有限公司 | Device and method for adjusting luminous diode brightness |
| CN100593806C (en) * | 2007-02-02 | 2010-03-10 | 中华映管股份有限公司 | Light emitting module drive apparatus and its drive method |
| CN101621877A (en) * | 2008-07-03 | 2010-01-06 | 台达电子工业股份有限公司 | Current feed circuit and current control circuit of light emitting diode |
| CN101848574A (en) * | 2009-03-27 | 2010-09-29 | 北京京东方光电科技有限公司 | Drive device of light emitting diode backlight source and brightness adjustment method |
| KR20120139038A (en) * | 2011-06-16 | 2012-12-27 | 삼성디스플레이 주식회사 | Backlight assembly, method for driving the same and display apparatus having the same |
| KR20130012670A (en) * | 2011-07-26 | 2013-02-05 | 삼성디스플레이 주식회사 | Backlight unit and current controlling method thereof |
| CN106531087B (en) * | 2016-11-29 | 2019-02-12 | 深圳市华星光电技术有限公司 | A kind of backlight drive circuit and liquid crystal display |
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