CN1811886A - Driver and driving method for semiconductor light-emitting element array - Google Patents
Driver and driving method for semiconductor light-emitting element array Download PDFInfo
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- CN1811886A CN1811886A CN200610004411.3A CN200610004411A CN1811886A CN 1811886 A CN1811886 A CN 1811886A CN 200610004411 A CN200610004411 A CN 200610004411A CN 1811886 A CN1811886 A CN 1811886A
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Abstract
This invention puts forward a driver of an array of semiconductor luminous cells including at least a current modulation unit containing multiple controllable switches for modulating volumes of each set serial current of the array, in which, the current volumes generate multiple feedback signals correspondingly via a feedback unit, a compensation unit generates related multiple control signals based on the input time sequence signals and the feedback signals to control said controllable switch, which can control the brightness and darkness and time sequence variance of the serial luminous cells.
Description
Technical field
The present invention relates to a kind of drive unit and method of semiconductor light-emitting element array, particularly relate to a kind of light emitting diode matrix (Light Emitting Diode Array) driver and driving method thereof of supporting the dynamic image control function.
Background technology
Back light source in LED is applied to LCD (Liquid Crystal Display gradually; LCD), it is with respect to existing cold cathode fluorescent lamp (Cold Cathode Fluorescent Lamp; CCFL) backlight has more environmental protection and better colour vividness performance.The back light source in LED driver adopts the constant current mode control of direct voltage drive usually, and this type of control mode often is applied to undersized white light emitting diode backlight; Or adopt Current Regulation integrated circuit (current sink IC) to carry out the control of RGB (RGB) three colors.Yet, this two classes control architecture is only applicable to order about the white balance after light-emitting diode (LED) module reaches current balance type and mixed light, and can't bring into play the sharpest edges of back light source in LED, for example: functions such as dynamic contrast adjustment, scanning backlight pattern (scanning backlight) and look preface (colorsequence) demonstration.Therefore, research in recent years all focuses on current balance type degree and the color temperature compensating function that how to strengthen back light source in LED.
United States Patent (USP) the 6th, 621, propose a kind of drive unit of LED array module 235B2 number, its framework is by a group controller, one group of metal oxide semiconductcor field effect transistor (Metal OxideSemiconductor Field Effect Transistor; MOSFET) form with light emitting diode matrix.This patent is pointed out, current mirror (Current Mirror) control methods that the electric current of LED array module can be formed via MOSFET and the compensation of controller reach the purpose of light emitting diode matrix electric current, but this type of control mode is only reached the effect of the current balance type and the mixed light white balance of light emitting diode matrix, and can't further cooperate liquid crystal display picture to reach functions such as dynamic contrast adjustment, scanning backlight pattern or look preface.
In addition, United States Patent (USP) the 6th, 864,867B2 number the driving circuit of another kind of LED array module is proposed, its framework is made up of a group controller, a group transistor and light emitting diode matrix, but the method that the control methods of this patent are also set forth as aforementioned patent adopts controller to carry out driving transistors, make LED array module reach the effect of current-sharing, this type of control mode also can't make the maximum effect of light emitting diode performance.
Summary of the invention
Because still there are numerous shortcomings in aforementioned existing back light source in LED, be necessary that the drive unit that proposes to improve makes the LED array module that is applied to such as LCD can bring into play bigger effect.
One of purpose of the present invention is to propose a kind of current driver that can drive such as the LCD back light source in LED, it can carry out independence other control to the magnitude of current of each group series connection light emitting diode in the LED array module, and the regulating and controlling voltage scope of tool broadness, to improve the narrow working voltage scope shortcoming of Current Regulation integrated circuit.
Another object of the present invention is to propose a kind of led current driver that can drive such as the LCD back light source in LED, it can reach light emitting diode matrix is carried out magnitude of current regulation and control and the function of lighting sequential, and the use of replacement Current Regulation integrated circuit, with effective reduction cost of manufacture.
Another object of the present invention is to propose a kind of led current driver that can drive such as the LCD back light source in LED, it can control the magnitude of current of LED array module, reach current balance type between light emitting diode matrix, its counterbalance effect more is better than use Current Regulation integrated circuit.
Another object of the present invention is to propose a kind of led current driver that can drive, make driven LED array module can reach broader video picture colour gamut (color gamut) quality such as the LCD back light source in LED.
Another object of the present invention is to propose a kind of led current driver that can drive such as the LCD back light source in LED, it can control the magnitude of current of every capable RGB array in the LED array module respectively, to reach the effect of regulation and control mixed light colour temperatures (color temperature).
Another purpose of the present invention is to propose a kind of application-specific IC (ApplicationSpecific Integrated Circuit that cooperates; Hereinafter to be referred as ASIC) the led current driver of image control signal, it can control the some bright area of LED array module respectively, to reach the effect that promotes dynamic contrast (dynamic contrast), makes the liquid crystal pictorial display quality better.
Another purpose of the present invention is to propose a kind of led current driver of the ASIC of cooperation image control signal, sequential is lighted in its zone that can control LED array module respectively, to reach the function of scanning backlight pattern, effectively reduce the video picture ghost and promote contrast.
Another purpose of the present invention is to propose a kind of led current driver of the ASIC of cooperation image control signal, what it can control every capable RGB array in the light-emitting diode (LED) module respectively lights sequential and frequency, reaching the function of look preface, and reduce the use of colored filter (color filter).
Can modular form extend expansion according to LED drive of the present invention, and be applicable to that different size is applied to the LED array module such as back light source in LED etc.It utilize to be feedback, variation is lighted in compensation, shading value, timing variations and the zone of controlling every string light emitting diode with the mode of regulation and control, can assist such as display device such as LCD and reach the relevant effect of numerous image processing, and the controller that utilizes active circuit element to form has more response speed and stable dynamic response accurately.Driver of the present invention comprises a current regulation unit at least, and it comprises a plurality of controllable switch, in order to the magnitude of current of each group series connection of indivedual adjusting semiconductor light-emitting element arrays.These magnitudes of current are feedback the unit via one and are produced corresponding a plurality of feedback signal.Compensating unit then according to the clock signal and the feedback signal of input, produces corresponding a plurality of control signal, in order to control aforesaid controllable switch.
Description of drawings
Fig. 1 shows the system architecture calcspar according to the light emitting diode active electric current driver of one embodiment of the present invention;
Fig. 2 shows and organizes more and connect the direct current power source supplying power supply module;
Fig. 3 shows the system architecture calcspar according to the light emitting diode active electric current driver of another embodiment of the present invention;
Fig. 4 A shows one of enforcement circuit of current regulation unit of the present invention;
Two of the enforcement circuit of Fig. 4 B demonstration current regulation unit of the present invention;
Three of the enforcement circuit of Fig. 4 C demonstration current regulation unit of the present invention;
Fig. 5 shows the circuit diagram of the back coupling unit of the embodiment of the invention;
Fig. 6 A shows one of enforcement circuit of compensating unit of the present invention;
Two of the enforcement circuit of Fig. 6 B demonstration compensating unit of the present invention; And
Fig. 7 shows the time-sequence control module of the embodiment of the invention.
The simple symbol explanation
I
L1/ I
L2/ I
LNThe flow through magnitude of current of every string light emitting diode
V
CR1/ V
CR2/ V
CRNThe contact of current regulation unit and every string light emitting diode or power supply
I
FB1/ I
FB2/ I
FBNThe back coupling unit captures the magnitude of current of every string light emitting diode
V
FB1/ V
FB2/ V
FBNFeedback voltage
V
Cmp1/ V
Cmp2/ V
CmpNThe control voltage of compensating unit output
V
Com1/ V
Com2/ V
ComNThe command signal of time-sequence control module output
V
DcbusDC voltage position standard
T
1/ T
2/ T
NBipolar junction transistor
Q
1/ Q
2/ Q
NThe power crystal
Ph
1/ Ph
2/ Ph
NPhoto-coupler
R
C1/ R
C2/ R
CNResistance
R
FB1/ R
FB2/ R
FBNResistance
C
FB1/ C
FB2/ C
FBNElectric capacity
R
T1/ R
T2/ R
TN/ R
P1/ R
P2/ R
PNResistance
R
I1/ R
I2/ R
INResistance
C
I1/ C
I2/ C
INElectric capacity
OP
1/ OP
1/ OP
NOperational amplifier
COMP
1/ COMP
2/ COMP
NComparer
V
Set1/ V
Set2/ V
SetNThe bist signal of time-sequence control module
Embodiment
Fig. 1 shows the system architecture calcspar according to the semiconductor light-emitting elements active electric current driver of one embodiment of the present invention.In the present embodiment, use light emitting diode as semiconductor light-emitting elements, yet other light-emitting component also can be suitable for.Light emitting diode active electric current driver according to present embodiment can be in order to driven for emitting lights diode array module 200, this light emitting diode active electric current driver comprise at least light emitting diode active electric current adjustment module 100, time-sequence control module 300, with direct current power supply module 400.Wherein, light emitting diode active electric current adjustment module 100 can comprise current regulation unit 110, back coupling unit 120 and compensating unit 130 3 parts again at least.
As shown in the figure, direct current power supply module 400 is electrically connected to LED array module 200, and LED array module 200 is connected to current regulation unit 110, and time-sequence control module 300 then is connected to compensating unit 130.In light emitting diode active electric current adjustment module 100, current regulation unit 110 is connected to back coupling unit 120, and back coupling unit 120 is connected to compensating unit 130, and compensating unit 130 connects the stream regulons 110 of wiring back.
Driven LED array module 200 can be adopted many light emitting diodes and be connected into array module capable and that multirow is arranged in parallel and disposes as shown in Figure 1 according to the size requirements of LCD, also can expand the quantity of array module on demand.Wherein, the light emitting diode that constitutes this array module 200 can be white light emitting diode, red light-emitting diode, green light LED, blue light-emitting diode, or the light emitting diode of RGB (RGB) three looks packing.This LED array module 200 can be connected to the anode tap of first light emitting diode of every string light emitting diode the output terminal of direct current power supply module 400; The cathode portion of caudal end light emitting diode then is connected to light emitting diode active electric current adjustment module 100.The magnitude of current (the I on every string light emitting diode flows through this moment
L1～I
LN) size, shading value, will independently be controlled by light emitting diode active electric current adjustment module 100 respectively with the sequential of lighting.
Direct current power supply module 400 can be supplied with the required stable dc power supply of LED array module 200, and its power source conversion that system end is supplied with becomes the required DC voltage position standard (V of LED array module 200
Dcbus).Transfer process can be boost conversion, step-down conversion, or the voltage stabilizing conversion.This direct current power supply module 400 can adopt direct current to design, exchange direct current transducer framework (AC-DC Converter) to direct current transducer framework (DC-DC Converter) or adopt low pressure drop integrated regulator (LDO; Low Dropout Voltage Regulator), voltage-multiplying circuit (Charge Pump), the circuit of forming with operational amplifier and passive device designs, and direct current power supply module 400 can carry out organizing more and connecing power supply according to the loading demand amount of LED array module 200, so that bigger direct supply to be provided, as shown in Figure 2.
Light emitting diode active electric current adjustment module 100 is controlled by the clock signal (V of time-sequence control module 300
Com1～V
ComN) and carry out relevant action, such as the magnitude of current (I that regulates every string light emitting diode
L1～I
LN) size and the sequential of lighting of controlling every string light emitting diode.Its principle of work is the actual electrical flow (I of the every string light emitting diode of acquisition
L1～I
LN), by the size of current regulation unit 110 independent Control current amounts, and with the current signal (I that regulates
L1～I
LN) be converted to voltage signal (V through back coupling unit 120
FB1～V
FBN) after, send into compensating unit 130 and carry out the closed loop s operation control, light sequential with the magnitude of current that orders about the every string light emitting diode of current regulation unit 110 regulation and control in real time with changing it, make the magnitude of current (I
L1～I
LN) reach required state with the timing variations form.Active electric current adjustment module 100 of the present invention can adopt active component and passive device to combine, and this control function integration and making can also be become single IC for both; But and the image control signal of the inner ASIC of active electric current adjustment module 100 fluid,matching crystal displays, carry out a series of dynamic control and sequential control, improve picture contrast, reduction image ghost and the purpose that reduces the colored filter utilization rate and reach.
Fig. 3 shows the system architecture calcspar of the semiconductor light-emitting elements active electric current driver of another embodiment of the present invention.Different with Fig. 1 is that the current regulation unit 110 of light emitting diode active electric current adjustment module 100 is disposed between direct current power supply module 400 and the LED array module 200, and is connected in the anode tap of LED array module 200.
Fig. 5 shows the circuit diagram of the back coupling unit 120 of the embodiment of the invention, and it is by many groups resistance (R
FB1～R
FBN) form, to reach the function of back coupling.Each resistance can and meet an electric capacity (C
FB1～C
FBN), control to reach to feedback more accurately.Each resistance (R
FB1～R
FBN) a termination receive electric current I from current regulation unit 110 (Fig. 1) or LED array module 200 (Fig. 3)
FB1～I
FBN, its other end is ground connection then.Voltage feedback signal (V after 120 conversions of back coupling unit
FB1～V
FBN) then offer compensating unit 130 and carry out computing and handle to use.
Compensating unit 130 can be to a series of control signal (V of current regulation unit 110 outputs
Cmp1～V
CmpN), regulate light-emitting diode luminance and light sequential to order about current regulation unit 110.Compensating unit 130 is according to being received from the clock signal (V that time-sequence control module 300 is exported
Com1～V
ComN) and feedback the feedback signal (V that unit 120 transmitted
FB1～V
FBN), via difference computing and proportional integral compensation back output control signal (V
Cmp1～V
CmpN) with actuating current regulon 110.In the present embodiment, except every string light emitting diode shading value of LED array module 200 with light sequential and independently be controlled by the control signal (V that sequential control circuit 300 is sent
Com1～V
ComN) outside, and can keep stable by every string led current by compensating unit 130 auxiliary.Fig. 6 A shows one of enforcement circuit of compensating unit of the present invention, and it utilizes operational amplifier (OP
1～OP
N) cooperate resistance and electric capacity with reach difference relatively with the effect of proportional plus integral control computing.In the present embodiment, each operation amplifier circuit comprises operational amplifier OP
i, first resistance R
Ti, second resistance R
Pi, the 3rd resistance R
Ii, and capacitor C
Ii, wherein the i of small letter be between 1 and N between numeric suffix.First resistance R
TiA termination receive clock signal from tfi module 300, the other end is connected to the positive input terminal of operational amplifier.Second resistance R
PiA termination receive the feedback signal of self-feedback unit 120, the other end is connected to the negative input end of operational amplifier.The 3rd resistance R
IiAn end be connected to operational amplifier OP
iNegative input end, the other end is connected to capacitor C
IiFirst end.Capacitor C
IiThe other end be connected to operational amplifier OP
iOutput terminal.Capacitor C wherein
IiCan omit, make the 3rd resistance R
IiThe other end be connected directly to operational amplifier OP
iOutput terminal; Also can be with resistance (R
I1～R
IN) and electric capacity (C
I1～C
IN) omit fully, only adopt amplifier to compare the function of computing.Two of the enforcement circuit of Fig. 6 B demonstration compensating unit of the present invention, it is by comparer (COMP
1～COMP
N) and resistance form.
Fig. 7 shows the circuit diagram of the time-sequence control module 300 of the embodiment of the invention, the control signal (V that it produced
Com1～V
ComN) order about 100 actuatings of light emitting diode active electric current adjustment module, with the sequential and the magnitude of current of controlling every string light emitting diode, and reach R, G in the real-time monitoring LED array module 200, the timing variations of B three looks and the function of brilliance control.Present embodiment can cooperate such as the picture of LCD to be done optimized light source adjustment, reduce ghost, improves contrast and the use that reduces colored filter, makes the liquid crystal pictorial display quality more clear beautiful.As shown in Figure 7, clock signal (V
Com1～V
ComN) producing method can be image control signal (image control signal 1～image control signal N) after receiving system end ASIC handles, the built-up circuit of forming via switch and exporting; Or the predeterminated voltage that is inside modules produces the default clock signal (V of foundation voluntarily of circuit (microchip) institute
Set1～V
SetN).Time-sequence control module 300 can be voluntarily according to the inner signal (V that sets up when not receiving the image control signal of system end
Set1～V
SetN) send as command signal, reach the effect of the every string led current amount in the regulation and control LED array module 200; LED array module 200 can be complied with these signals V
Set1～V
SetNAdjust the colour temperature behind the RGB mixed light, or cause white light emitting diode to reach the effect of white balance.After the image control signal that receives system end, then can cooperate display frame to do the dynamic control of RGB three colors, and reach the function of scanning backlight pattern and RGB look preface.The predeterminated voltage of time-sequence control module 300 inside produces circuit (microchip) can be made up of mimic channel, or adopts such as complicated programmable logical unit (Complex Programmable Logical Device; CPLD) but, scene program gate array (Field Programmable Gate Array; FPGA) or microchip programmable elements such as (Micro-Chip).Time-sequence control module 300 can be cooperated passive device to constitute by the technology IC of programmable as the aforementioned, also or separately be made of the programmable element.
Above embodiment only makes example for possible reality.Many variations or modification all can be reached under the principle that does not break away from this announcement.These variations or revise all should be considered as within this announcement category and to be protected by appended claim.
Claims (24)
1, a kind of driver of semiconductor light-emitting element array comprises:
Current regulation unit, it comprises a plurality of controllable switch, in order to the magnitude of current of each group series connection of indivedual these semiconductor light-emitting element arrays of adjusting;
The back coupling unit, its these a plurality of magnitudes of current of basis are to produce corresponding a plurality of feedback signal; And
Compensating unit, it is according to a plurality of clock signals and these a plurality of feedback signals of input, to produce corresponding a plurality of control signal, in order to these a plurality of controllable switch of control.
2, the driver of semiconductor light-emitting element array as claimed in claim 1, wherein the controllable switch of this current regulation unit has control end, input end and output terminal, this control end is electrically connected on this compensating unit, this input end is electrically connected on this semiconductor light-emitting element array, and this output terminal is electrically connected on this back coupling unit.
3, the driver of semiconductor light-emitting element array as claimed in claim 2, it also comprises power supply module, is electrically connected on this semiconductor light-emitting element array.
4, the driver of semiconductor light-emitting element array as claimed in claim 1, wherein the controllable switch of this current regulation unit has control end and is electrically connected on this compensating unit, and output terminal is electrically connected on this semiconductor light-emitting element array.
5, the driver of semiconductor light-emitting element array as claimed in claim 4, it also comprises power supply module, is electrically connected on the input end of this controllable switch.
6, the driver of semiconductor light-emitting element array as claimed in claim 1, wherein the controllable switch of this current regulation unit is bipolar junction transistor, power crystal or photo-coupler.
7, the driver of semiconductor light-emitting element array as claimed in claim 1, wherein this back coupling unit comprises a plurality of resistors, in order to being converted to a plurality of voltages by a plurality of magnitudes of current, produces this a plurality of feedback signals.
8, the driver of semiconductor light-emitting element array as claimed in claim 7, wherein this back coupling unit also comprises a plurality of capacitors, is parallel to this a plurality of resistors respectively.
9, the driver of semiconductor light-emitting element array as claimed in claim 1, wherein this compensating unit comprises a plurality of operational amplifiers, one input end receives this clock signal, and its another input end receives the feedback signal of this back coupling unit, and its output terminal then produces this control signal.
10, the driver of semiconductor light-emitting element array as claimed in claim 1, wherein this compensating unit comprises a plurality of comparers, one input end receives this clock signal, and its another input end receives the feedback signal of this back coupling unit, and its output terminal then produces this control signal.
11, the driver of semiconductor light-emitting element array as claimed in claim 1, it also comprises time-sequence control module, in order to produce these a plurality of clock signals.
12, the driver of semiconductor light-emitting element array as claimed in claim 11, wherein this time-sequence control module comprises that predeterminated voltage produces circuit, in order to produce these default a plurality of clock signals.
13, the driver of semiconductor light-emitting element array as claimed in claim 11, wherein this time-sequence control module comprises built-up circuit, in order to receiving outside a plurality of image control signals, and with its output as these a plurality of clock signals.
14, the driver of semiconductor light-emitting element array as claimed in claim 1, wherein this semiconductor light-emitting elements is a light emitting diode.
15, a kind of driving method of semiconductor light-emitting element array comprises:
(a) provide a plurality of clock signals;
(b) provide the magnitude of current of each group series connection of this semiconductor light-emitting element array respectively;
(c) these a plurality of magnitudes of current of basis are to produce corresponding a plurality of feedback signal;
(d) according to these a plurality of clock signals and these a plurality of feedback signals, to produce corresponding a plurality of control signal; And
(e) according to the further indivedual magnitudes of current of regulating each group series connection of this semiconductor light-emitting element array of these a plurality of control signals.
16, the driving method of semiconductor light-emitting element array as claimed in claim 15, direct supply that provides this semiconductor light-emitting element array required also is provided for it.
17, the driving method of semiconductor light-emitting element array as claimed in claim 15, wherein in step (e), this control signal is electrically connected to the base stage of bipolar junction transistor, by its emitter or collector to regulate the magnitude of current of this semiconductor light-emitting element array.
18, the driving method of semiconductor light-emitting element array as claimed in claim 15 wherein in step (e), is electrically connected to the grid of power crystal with this control signal, by its drain electrode or source electrode to regulate the magnitude of current of this semiconductor light-emitting element array.
19, the driving method of semiconductor light-emitting element array as claimed in claim 15 wherein in step (e), is electrically connected to the input end of photo-coupler with this control signal, by its output terminal to regulate the magnitude of current of this semiconductor light-emitting element array.
20, the driving method of semiconductor light-emitting element array as claimed in claim 15 is wherein in step (c), with this magnitude of current input resistor, to be converted to voltage, as this feedback signal.
21, the driving method of semiconductor light-emitting element array as claimed in claim 15 wherein in step (d), inputs to operational amplifier with this clock signal and this feedback signal, produces this control signal with output.
22, the driving method of semiconductor light-emitting element array as claimed in claim 15 wherein in step (d), inputs to comparer with this clock signal and this feedback signal, produces this control signal with output.
23, the driving method of semiconductor light-emitting element array as claimed in claim 15 wherein in step (a), produces these default a plurality of clock signals.
24, the driving method of semiconductor light-emitting element array as claimed in claim 15 wherein in step (a), receives outside a plurality of image control signals, and it is exported as this clock signal.
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|---|---|---|---|
| CNB2006100044113A CN100412937C (en) | 2006-02-10 | 2006-02-10 | Driver and driving method for semiconductor light-emitting element array |
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|---|---|---|---|
| CNB2006100044113A CN100412937C (en) | 2006-02-10 | 2006-02-10 | Driver and driving method for semiconductor light-emitting element array |
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| CN100412937C CN100412937C (en) | 2008-08-20 |
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| WO2020177588A1 (en) * | 2019-03-06 | 2020-09-10 | 深圳光峰科技股份有限公司 | Display system |
| CN111665679A (en) * | 2019-03-06 | 2020-09-15 | 深圳光峰科技股份有限公司 | Display system |
| CN111665679B (en) * | 2019-03-06 | 2022-08-12 | 深圳光峰科技股份有限公司 | Display system |
| US12100364B2 (en) | 2019-03-06 | 2024-09-24 | Appotronics Corporation Limited | Display system having original image be displayed without color difference |
| CN115497424A (en) * | 2022-09-20 | 2022-12-20 | 惠科股份有限公司 | Backlight brightness compensation system and compensation method thereof |
| CN115497424B (en) * | 2022-09-20 | 2023-08-25 | 惠科股份有限公司 | Backlight brightness compensation system and compensation method thereof |
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