CN109640457A - A kind of Micro LED drive circuit and method - Google Patents

A kind of Micro LED drive circuit and method Download PDF

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Publication number
CN109640457A
CN109640457A CN201910048573.4A CN201910048573A CN109640457A CN 109640457 A CN109640457 A CN 109640457A CN 201910048573 A CN201910048573 A CN 201910048573A CN 109640457 A CN109640457 A CN 109640457A
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China
Prior art keywords
current
constant
branch
circuit
driving
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Pending
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CN201910048573.4A
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Chinese (zh)
Inventor
许木桂
何苗
黄仕华
熊德平
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Guangdong University of Technology
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Guangdong University of Technology
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Priority to CN201910048573.4A priority Critical patent/CN109640457A/en
Publication of CN109640457A publication Critical patent/CN109640457A/en
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B45/00Circuit arrangements for operating light emitting diodes [LED]
    • H05B45/10Controlling the intensity of the light
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/22Control 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
    • G09G3/30Control 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
    • G09G3/32Control 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]

Abstract

The invention discloses a kind of Micro LED drive circuits, comprising: central processing unit and three tunnel branch constant-current circuits;The central processing unit, for receiving driving instruction and exporting corresponding analog control signal respectively to each branch's constant-current circuit according to the driving instruction;And it receives the feedback current of each branch's constant-current circuit return and the analog control signal is adjusted according to the feedback current;Each branch's constant-current circuit, for exporting corresponding driving current to corresponding light emitting diode according to the analog control signal and returning to the corresponding feedback current to the central processing unit;The Micro LED drive circuit can effectively improve the brightness uniformity and stability of Micro LED.The invention also discloses a kind of Micro LED driving methods, equally have above-mentioned technique effect.

Description

A kind of Micro LED drive circuit and method
Technical field
The present invention relates to LED technology field, in particular to a kind of Micro LED drive circuit and method.
Background technique
Micro LED, that is, miniature LED refers to that addressing flood tide is transferred to circuit substrate after array, miniatureization by traditional LED It is formed by extra small spacing LED, realizes millimetre-sized LED length is further miniature to micron order, reaches very-high solution, super High resolution factor.Micro LED is similar to OLED, have without backlight, can self luminous characteristic, but compared with OLED, Micro The brilliance of LED is easier accurate debugging, and luminescent lifetime is longer, brightness is higher, therefore the next-generation display skill after being known as OLED Art.
In the development process of Micro LED, driving circuit is one of its key technology.LED is that current drive-type shines Device, driving method include that passive addressing driving and active location drive.No matter above-mentioned which kind of driving method is used, it is existing Driving circuit can not preferably meet the needs of Micro LED luminance uniformity and stability.
Therefore, how to ensure that the brightness uniformity of Micro LED and stability are that those skilled in the art are urgently to be resolved Technical problem.
Summary of the invention
The object of the present invention is to provide a kind of Micro LED drive circuit and methods, are capable of effective guarantee Micro LED's Brightness uniformity and stability.
In order to solve the above technical problems, a kind of Micro LED drive circuit, the driving circuit include: central processing unit And three tunnel branch constant-current circuit;
The central processing unit is controlled for receiving driving instruction and exporting corresponding simulation respectively according to the driving instruction Signal processed is to each branch's constant-current circuit;And receive feedback current that each branch's constant-current circuit returns and according to described Feedback current adjusts the analog control signal;
Each branch's constant-current circuit, for exporting corresponding driving current to corresponding according to the analog control signal Light emitting diode simultaneously returns to the corresponding feedback current to the central processing unit.
Optionally, the central processing unit includes: that data register, address latch, arithmetic unit and three groups of signals turn Change group;Wherein, each signal conversion group includes D/A converter and A/D converter;
The data register, for receiving the driving instruction;
The address latch, for latching pixel address;
The arithmetic unit, for exporting corresponding digital controlled signal respectively to each conversion according to the driving instruction Group and the digital feedback signal for receiving each conversion group transmission;
Each conversion group is controlled for the digital controlled signal to be converted to the simulation by the D/A converter Signal processed is simultaneously exported to corresponding branch's constant-current circuit;The feedback current is converted into institute by the A/D converter It states digital feedback signal and is sent to the arithmetic unit.
Optionally, branch's constant-current circuit includes:
Operational amplifier, current-limiting resistance, feedback resistance and MOS switch pipe;
Wherein, the noninverting input of the operational amplifier is connected with the corresponding D/A converter, the operation amplifier The reverse input end of device is connected with the source electrode of the MOS switch pipe, the output end of the operational amplifier and the current-limiting resistance One end be connected;The other end of the current-limiting resistance is connected with the grid of the MOS switch pipe;The drain electrode of the MOS switch pipe It is connected with the cathode of the light emitting diode;One end of the feedback resistance and the source electrode of the MOS switch pipe and corresponding institute It states A/D converter to be connected, the other end ground connection of the feedback resistance.
Optionally, branch's constant-current circuit further include:
First capacitor, the second capacitor, third capacitor and the 4th capacitor;
Wherein, the first capacitor is in parallel with second capacitor, and the first common end and the operational amplifier is same It is connected to input terminal, the second common end grounding;The third capacitor is in parallel with the 4th capacitor, and the first common end with it is described The reverse input end of operational amplifier is connected, the second common end grounding.
Optionally, branch's constant-current circuit further include:
Protection diode, the cathode of the protection diode are connected with the drain electrode of the MOS switch pipe, two poles of the protection The anode of pipe is connected with the source electrode of the MOS switch pipe.
Optionally, the central processing unit is laid in the different circuits of integrated circuit board from each branch's constant-current circuit Layer, and each circuit layer is overlapped mutually.
In order to solve the above technical problems, the present invention also provides a kind of Micro LED driving methods, comprising: central processing Tri- tunnel branch constant-current circuit of Qi Ji;The central processing unit, for receiving driving instruction and being distinguished according to the driving instruction defeated Corresponding analog control signal is to each branch's constant-current circuit out;And receive the feedback that each branch's constant-current circuit returns Electric current simultaneously adjusts the analog control signal according to the feedback current;Each branch's constant-current circuit, for according to the mould Quasi- control signal exports corresponding driving current to corresponding light emitting diode and returns to the corresponding feedback current to described Central processing unit.
Optionally, the central processing unit receives driving instruction and exports corresponding simulation respectively according to the driving instruction Signal is controlled to each branch's constant-current circuit;And receive feedback current that each branch's constant-current circuit returns and according to described anti- Supply current adjusts the analog control signal, comprising:
The arithmetic unit of the central processing unit is from the data register reading driving instruction and according to the driving instruction Corresponding digital controlled signal is exported respectively to each conversion group, and receives the digital feedback signal of each conversion group transmission simultaneously The digital controlled signal is adjusted according to the digital feedback signal;
The digital controlled signal is converted to the analog control signal and defeated by D/A converter by each conversion group Out to corresponding branch's constant-current circuit;The feedback current is converted into the digital feedback signal by A/D converter And it is sent to the arithmetic unit.
Optionally, each branch's constant-current circuit exports corresponding driving current extremely according to the analog control signal Corresponding light emitting diode, comprising:
The operational amplifier of branch's constant-current circuit is according to the corresponding driving electricity of analog control signal output It flow to the corresponding light emitting diode.
Micro LED drive circuit provided by the present invention, comprising: central processing unit and three tunnel branch constant-current circuits;Institute Central processing unit is stated, exports corresponding analog control signal respectively extremely for receiving driving instruction, and according to the driving instruction Each branch's constant-current circuit;And the feedback current that each branch's constant-current circuit returns is received, and according to the feedback electricity Stream adjusts the analog control signal;Branch's constant-current circuit, for exporting corresponding drive according to the analog control signal Streaming current is to corresponding light emitting diode and returns to the feedback current to the central processing unit;Wherein, each branch is permanent Current circuit is connected with red light-emitting diode, green light LED and blue light-emitting diode respectively.
As it can be seen that Micro LED drive circuit provided by the present invention, by the way of active location driving, each branch is permanent Current circuit is connected respectively the photochromic light emitting diode of the difference in single pixel, by central processing unit according to driving instruction control System is exported to the size of the driving current of each light emitting diode, and introduces negative feedback mechanism, is combined and is shone using central processing unit The size of driving current is adjusted in the actual current of diode, that is, above-mentioned feedback current, so as to effective guarantee Micro The brightness uniformity and stability of LED.
Micro LED driving method provided by the present invention, equally has above-mentioned technique effect.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to institute in the prior art and embodiment Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings Obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram of Micro LED drive circuit provided by the embodiment of the present invention;
Fig. 2 is a kind of structural schematic diagram of central processing unit provided by the embodiment of the present invention;
Fig. 3 is a kind of structural schematic diagram of branch's constant-current circuit provided by the embodiment of the present invention;
Fig. 4 is the structural schematic diagram of another kind branch constant-current circuit provided by the embodiment of the present invention;
Fig. 5 is the structural schematic diagram of another branch's constant-current circuit provided by the embodiment of the present invention;
Fig. 6 is a kind of flow diagram of Micro LED driving method provided by the embodiment of the present invention.
Specific embodiment
Core of the invention is to provide a kind of Micro LED drive circuit and method, is capable of effective guarantee Micro LED's Brightness uniformity and stability.
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 is A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Referring to FIG. 1, Fig. 1 is a kind of schematic diagram of Micro LED drive circuit provided by the embodiment of the present invention;With reference to Fig. 1, the driving circuit include: central processing unit 10 and three tunnel branch constant-current circuits 20;
Wherein, central processing unit 10 is responsible for regulating and controlling and be exported to the size of the driving current of each light emitting diode, by dividing The brightness of each light emitting diode is not controlled, realizes display color and the brightness of three primary colours superposition synthesis single pixel.In specifically, After central processor 10 receives driving instruction, analyzes the driving instruction and export corresponding analog control signal respectively to each branch's perseverance Current circuit 20 passes through red, green, blue three to realize so that each branch's constant-current circuit 20 exports the driving current of corresponding size Primary colours superposition synthesis single pixel needs color to be shown and brightness.
In addition, central processing unit 10 is also used to receive the feedback current that each branch's constant-current circuit 20 returns, so-called feedback electricity Stream is the actual current passed through in light emitting diode, and according to each feedback current adjustment output to corresponding branch's constant-current circuit 20 Analog control signal, and then corresponding branch's constant-current circuit 20 is made to adjust the size of driving current, ensures light emitting diode Brightness uniformity and stability.
Wherein, in a kind of specific embodiment, central processing unit 10 includes: data register, address latch, fortune Calculate device and three groups of signal conversion groups;Wherein, each signal conversion group includes D/A converter and A/D converter;Data register, For receiving driving instruction;Address latch, for latching pixel address;Arithmetic unit, for being exported respectively according to driving instruction Corresponding digital controlled signal is to each conversion group and receives the digital feedback signal of each conversion group transmission;Each conversion group, for leading to D/A converter is crossed digital controlled signal is converted to analog control signal and is exported to corresponding branch's constant-current circuit;Pass through A/D Feedback current is converted to digital feedback signal and is sent to arithmetic unit by converter.
Specifically, referring to FIG. 2, in the present embodiment, central processing unit 10 be provided with address latch, data register, Arithmetic unit and signal conversion group, wherein single-chip microcontroller can be used in operation implement body.Address latch is used to latch pixel address, To which when showing that signal does not change, the pixel of Micro LDE, which is shown, voluntarily to be controlled by central processing unit, then can largely be subtracted The scanning burden of few higher level's circuit, reduces power loss, improves exhibit stabilization.Data register is for receiving from higher level's electricity The driving instruction on road, the driving instruction may include pixel intensity and color.Arithmetic unit reads the driving from data register Instruction, and the D/A converter that analysis exports corresponding digital controlled signal to each signal conversion group is carried out to driving instruction, in turn Corresponding digital controlled signal is converted into analog control signal and further that analog control signal is defeated by each D/A converter Out to branch's constant-current circuit 20.The A/D converter of each signal conversion group is receiving what corresponding branch's constant-current circuit 20 returned After feedback current, it is responsible for converting digital feedback signal for feedback current, and digital feedback signal is transmitted to arithmetic unit, so that Arithmetic unit combines this digital feedback signal to carry out the adjusting of driving current, realizes that driving current in the deviation range of permission, is protected Hinder the brightness uniformity and stability of light emitting diode.
Each branch's constant-current circuit 20 respectively with red light-emitting diode, green light LED and blue light-emitting diode phase Even, for exporting corresponding driving current to corresponding light emitting diode and by the reality of light emitting diode according to analog control signal Border current feedback is to central processing unit.
In a kind of specific embodiment, branch's constant-current circuit 20 includes: operational amplifier, current-limiting resistance, feedback electricity Resistance and MOS switch pipe;Wherein, the noninverting input of operational amplifier and corresponding D/A converter are connected, operational amplifier it is anti- It is connected to input terminal with the source electrode of MOS switch pipe, the output end of operational amplifier is connected with one end of current-limiting resistance;Current-limiting resistance The other end be connected with the grid of MOS switch pipe;The drain electrode of MOS switch pipe is connected with the cathode of light emitting diode;Feedback resistance One end and the source electrode of MOS switch pipe and corresponding A/D converter be connected, the other end ground connection of feedback resistance.
Specifically, reducing the mutual interference of each branch's constant-current circuit to improve parameter consistency, in the present embodiment, respectively The circuit structure of branch's constant-current circuit 20 is identical, and includes operational amplifier, current-limiting resistance, feedback resistance and MOS switch Pipe.By taking the branch's constant-current circuit for being connected to red light-emitting diode as an example, referring to FIG. 3, Fig. 3 is provided by the embodiment of the present invention A kind of branch's constant-current circuit structural schematic diagram, in conjunction with Fig. 3, in the noninverting input and central processing unit of operational amplifier The D/A converter of signal conversion group is connected all the way, and reverse input end is connected with the A/D converter of the signal conversion group, defeated Outlet is connected with one end of current-limiting resistance R1, and the other end of current-limiting resistance R1 is connected with the grid of MOS switch pipe T1, MOS switch The drain electrode of pipe T1 is connected with the cathode of red light-emitting diode, one end of feedback resistance R2 and the source electrode of MOS switch pipe T1 and on It states A/D converter to be connected, the other end ground connection of feedback resistance R2.In addition, the power input of operational amplifier can connect respectively Connect the positive electrode and negative electrode of 5V power supply.The analog control signal that input to, operational amplifier according to noninverting input and reversely The feedback current of input terminal input exports the grid of corresponding driving current to MOS switch pipe T1, control MOS switch pipe T1 conducting Or shutdown, and then realize the purpose for exporting corresponding driving current to light emitting diode.
The case where showing black for single pixel then can control each branch's constant current since display screen is black shirt bottom The shutdown display output of circuit 20, can be realized the needs of display black, so as to which electric quantity consumption is effectively reduced.
Further, in a kind of specific embodiment, branch's constant-current circuit 20 further include: first capacitor, the second capacitor, Third capacitor and the 4th capacitor;Wherein, first capacitor is in parallel with the second capacitor, and the first common end and operational amplifier is same It is connected to input terminal, the second common end grounding;Third capacitor is in parallel with the 4th capacitor, and the first common end and operational amplifier Reverse input end is connected, the second common end grounding.
Specifically, will cause strong noise electromagnetic interference in view of the high-frequency on-off of MOS switch pipe, therefore, to avoid height from making an uproar Influence of the acoustic jamming to branch's constant-current circuit, in the present embodiment, branch's constant-current circuit is additionally provided with filter capacitor.Equally, with even It is connected to for branch's constant-current circuit of red light-emitting diode, referring to FIG. 4, Fig. 4 is another provided by the embodiment of the present invention The structural schematic diagram of kind of branch's constant-current circuit, in conjunction with Fig. 4, first capacitor C1 is in parallel with the second capacitor C2, the first common end and The noninverting input of operational amplifier is connected, the second common end grounding.Third capacitor C3 is in parallel with the 4th capacitor C4, and the of the two One common end is connected with the reverse input end of operational amplifier, the second common end grounding.To pass through first capacitor C1 and third Capacitor C3 carries out High frequency filter, carries out low frequency filtering by the second capacitor C2 and the 4th capacitor C4.Wherein, first capacitor C1 and The capacitance of three capacitor C3 can be able to be 100nF for the capacitance of 30pF, the second capacitor C2 and the 4th capacitor C4.
Further, in a kind of specific embodiment, branch's constant-current circuit 20 further include: protection diode, protection two The cathode of pole pipe is connected with the drain electrode of MOS switch pipe, and the anode of protection diode is connected with the source electrode of MOS switch pipe.
Specifically, dash current damages MOS switch pipe, the present embodiment to prevent frequent on-off MOS switch pipe In, each branch's constant-current circuit is additionally provided with protection diode, still to be connected to branch's constant-current circuit of red light-emitting diode For, referring to FIG. 5, Fig. 5 is the structural schematic diagram of another branch's constant-current circuit provided by the embodiment of the present invention, in conjunction with figure 5, protection diode D1 is reversely connected between the drain electrode and source electrode of MOS switch pipe T1, i.e. the cathode and MOS of protection diode D1 The drain electrode of switch transistor T 1 is connected, and the anode of protection diode D1 is connected with the source electrode of MOS switch pipe T1.
Further, in a kind of specific embodiment, central processing unit 10 and each branch's constant-current circuit 20 are laid in collection At the different circuit layers of circuit board, and each circuit layer is overlapped mutually.
Specifically, Micro LED is that LDE structure is carried out to filming, microminiaturization, array processing, the ruler of single pixel It is very little in 1 to 10 micron order, and since Micro LED drive circuit provided by the present invention corresponds to the control of single pixel, to realize Single-point self-luminous, therefore to reduce discrete component, circuit board area occupied is reduced, the present embodiment equally drives Micro LED Circuit carries out microminiaturization, array processing, specific that central processing unit 10 and each branch's constant-current circuit 20 are integrated in integrated electricity Road plate, central processing unit 10 and each branch's constant-current circuit 20 are made into a circuit layer respectively, and four circuit layers are mutually perpendicular to fold Add.
In conclusion Micro LED drive circuit provided by the present invention, by the way of active location driving, each point Branch constant-current circuit is connected respectively the photochromic light emitting diode of the difference in single pixel, is referred to by central processing unit according to driving It enables control export to the size of the driving current of each light emitting diode, and introduces negative feedback mechanism, combined using central processing unit The size of driving current is adjusted in the actual current of light emitting diode, that is, above-mentioned feedback current, so as to effective guarantee The brightness uniformity and stability of Micro LED.
The present invention also provides a kind of Micro LED driving method, this method described below can with it is above-described Circuit corresponds to each other reference.Referring to FIG. 6, Fig. 6 provides a kind of process of Micro LED driving method by the embodiment of the present invention Schematic diagram;In conjunction with Fig. 6, which includes:
S101: central processing unit receives driving instruction and exports corresponding analog control signal respectively extremely according to driving instruction Each branch's constant-current circuit;And it receives the feedback current of each branch's constant-current circuit return and simulation control is adjusted according to feedback current Signal;
S102: each branch's constant-current circuit exports corresponding driving current to corresponding light-emitting diodes according to analog control signal Pipe, and corresponding feedback current is returned to central processing unit.
On the basis of the above embodiments, central processing unit receives driving instruction and exports correspondence respectively according to driving instruction Analog control signal to each branch's constant-current circuit;And receive feedback current that each branch's constant-current circuit returns and according to feedback Electric current adjusts analog control signal, comprising:
The arithmetic unit of central processing unit reads driving instruction from data register and exports correspondence respectively according to driving instruction Digital controlled signal to each conversion group, and receive the digital feedback signal of each conversion group transmission and according to digital feedback signal Adjust digital controlled signal;
Digital controlled signal is converted to analog control signal by D/A converter and exported to corresponding point by each conversion group Branch constant-current circuit;Feedback current is converted into digital feedback signal by A/D converter and is sent to arithmetic unit.
On the basis of the above embodiments, each branch's constant-current circuit exports corresponding driving current according to analog control signal To corresponding light emitting diode, comprising:
The operational amplifier of branch's constant-current circuit exports corresponding driving current to corresponding hair according to analog control signal Optical diode.
Each embodiment is described in a progressive manner in specification, the highlights of each of the examples are with other realities The difference of example is applied, the same or similar parts in each embodiment may refer to each other.
Micro LED drive circuit provided by the present invention and method are described in detail above.It is used herein A specific example illustrates the principle and implementation of the invention, and the above embodiments are only used to help understand Method and its core concept of the invention.It should be pointed out that for those skilled in the art, not departing from this , can be with several improvements and modifications are made to the present invention under the premise of inventive principle, these improvement and modification also fall into the present invention Scope of protection of the claims.
It should also be noted that, in the present specification, relational terms such as first and second and the like be used merely to by One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that A little elements, but also other elements including being not explicitly listed, or further include for this process, method, article or The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged Except there is also other identical elements in the process, method, article or equipment for including element.

Claims (9)

1. a kind of Micro LED drive circuit, which is characterized in that the driving circuit includes: central processing unit and three tunnel branches Constant-current circuit;
The central processing unit, for receiving driving instruction and exporting corresponding simulation control letter respectively according to the driving instruction Number to each branch's constant-current circuit;And receive feedback current that each branch's constant-current circuit returns and according to the feedback Electric current adjusts the analog control signal;
Each branch's constant-current circuit shines for exporting corresponding driving current according to the analog control signal to corresponding Diode simultaneously returns to the corresponding feedback current to the central processing unit.
2. driving circuit according to claim 1, which is characterized in that the central processing unit include: data register, Location latch, arithmetic unit and three groups of signal conversion groups;Wherein, each signal conversion group includes that D/A converter and A/D are converted Device;
The data register, for receiving the driving instruction;
The address latch, for latching pixel address;
The arithmetic unit, for exporting corresponding digital controlled signal respectively to each conversion group simultaneously according to the driving instruction Receive the digital feedback signal of each conversion group transmission;
Each conversion group, for the digital controlled signal to be converted to the simulation control letter by the D/A converter Number and export to corresponding branch's constant-current circuit;The feedback current is converted into the number by the A/D converter Word feedback signal is simultaneously sent to the arithmetic unit.
3. driving circuit according to claim 2, which is characterized in that branch's constant-current circuit includes:
Operational amplifier, current-limiting resistance, feedback resistance and MOS switch pipe;
Wherein, the noninverting input of the operational amplifier is connected with the corresponding D/A converter, the operational amplifier Reverse input end is connected with the source electrode of the MOS switch pipe, and the one of the output end of the operational amplifier and the current-limiting resistance End is connected;The other end of the current-limiting resistance is connected with the grid of the MOS switch pipe;The drain electrode of the MOS switch pipe and institute The cathode for stating light emitting diode is connected;One end of the feedback resistance and the source electrode of the MOS switch pipe and the corresponding A/D Converter is connected, the other end ground connection of the feedback resistance.
4. driving circuit according to claim 3, which is characterized in that branch's constant-current circuit further include:
First capacitor, the second capacitor, third capacitor and the 4th capacitor;
Wherein, the first capacitor is in parallel with second capacitor, and the first common end and the operational amplifier is in the same direction defeated Enter end to be connected, the second common end grounding;The third capacitor is in parallel with the 4th capacitor, and the first common end and the operation The reverse input end of amplifier is connected, the second common end grounding.
5. driving circuit according to claim 4, which is characterized in that branch's constant-current circuit further include:
Protection diode, the cathode of the protection diode are connected with the drain electrode of the MOS switch pipe, the protection diode Anode is connected with the source electrode of the MOS switch pipe.
6. driving circuit according to claim 5, which is characterized in that the central processing unit and each branch's Constant Electric Current Road is laid in the different circuit layers of integrated circuit board, and each circuit layer is overlapped mutually.
7. a kind of Micro LED driving method characterized by comprising
Central processing unit receives driving instruction and exports corresponding analog control signal respectively to each point according to the driving instruction Branch constant-current circuit;And receive feedback current that each branch's constant-current circuit returns and according to feedback current adjustment Analog control signal;
Each branch's constant-current circuit exports corresponding driving current to corresponding light-emitting diodes according to the analog control signal Pipe, and the corresponding feedback current is returned to the central processing unit.
8. driving method according to claim 7, which is characterized in that the central processing unit receives driving instruction and basis The driving instruction exports corresponding analog control signal to each branch's constant-current circuit respectively;And receive each branch's constant current The feedback current of circuit return simultaneously adjusts the analog control signal according to the feedback current, comprising:
The arithmetic unit of the central processing unit reads the driving instruction from data register and is distinguished according to the driving instruction Corresponding digital controlled signal is exported to each conversion group, and the digital feedback signal and basis of each conversion group transmission of reception The digital feedback signal adjusts the digital controlled signal;
The digital controlled signal is converted to the analog control signal by D/A converter and exported extremely by each conversion group Corresponding branch's constant-current circuit;The feedback current is converted into the digital feedback signal by A/D converter and is passed It send to the arithmetic unit.
9. driving method according to claim 8, which is characterized in that each branch's constant-current circuit is according to the mould Quasi- control signal exports corresponding driving current to corresponding light emitting diode, comprising:
The operational amplifier of branch's constant-current circuit exports the corresponding driving current extremely according to the analog control signal The corresponding light emitting diode.
CN201910048573.4A 2019-01-18 2019-01-18 A kind of Micro LED drive circuit and method Pending CN109640457A (en)

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Publication number Priority date Publication date Assignee Title
CN101784145A (en) * 2009-07-06 2010-07-21 深圳茂硕电源科技股份有限公司 Remote stepless dimming LED multi-path drive constant-current system and constant-current source
CN103680421A (en) * 2013-11-21 2014-03-26 浙江龙驰科技有限公司 LED backlight drive circuit
CN104363685A (en) * 2014-12-04 2015-02-18 青岛歌尔声学科技有限公司 Flyback direct-drive LED (Light Emitting Diode) power supply circuit based on current feedback and television

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101784145A (en) * 2009-07-06 2010-07-21 深圳茂硕电源科技股份有限公司 Remote stepless dimming LED multi-path drive constant-current system and constant-current source
CN103680421A (en) * 2013-11-21 2014-03-26 浙江龙驰科技有限公司 LED backlight drive circuit
CN104363685A (en) * 2014-12-04 2015-02-18 青岛歌尔声学科技有限公司 Flyback direct-drive LED (Light Emitting Diode) power supply circuit based on current feedback and television

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