CN107222947A - Light emitting device and light emitting diode driving circuit - Google Patents
Light emitting device and light emitting diode driving circuit Download PDFInfo
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- CN107222947A CN107222947A CN201710320429.2A CN201710320429A CN107222947A CN 107222947 A CN107222947 A CN 107222947A CN 201710320429 A CN201710320429 A CN 201710320429A CN 107222947 A CN107222947 A CN 107222947A
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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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Abstract
The invention discloses a light-emitting device and a light-emitting diode driving circuit. The light emitting diode driving circuit comprises a driving signal generator and a compensation voltage provider. The driving signal generator provides a first driving signal and a second driving signal to the first driving line and the second driving line respectively in a scanning time interval. The compensation voltage provider provides a compensation voltage to the third driving line in a first time interval of the scanning time interval, adjusts the compensation voltage according to the threshold voltage of the second light emitting diode, and enables the third driving line to be in non-fixed connection in a second time interval of the scanning time interval.
Description
Technical field
The present invention relates to a kind of light-emitting device and its drive circuit, more particularly to can to provide offset voltage residual to eliminate for one kind
The light-emitting device and its drive circuit of shadow.
Background technology
There is provided the light-emitting diode lamp-plate of diversified forms in the known light-emitting device being made up of diode.Wherein,
Various forms of light-emitting diode lamp-plates have the configuration mode of the light emitting diode of different modes respectively.Although carrying out this
During the design of the configuration mode of the light emitting diode of a little light-emitting diode lamp-plates, institute is issuable when for actually lighting
Ghost phenomena is considered, but in practical operation, when light-emitting diode lamp-plate is lit, still there is a number of residual
Shadow phenomenon can not be avoided, and cause illumination effect to be destroyed.
Refer to Figure 1A~Fig. 1 C, Figure 1A~Fig. 1 C below is respectively various forms of light-emitting diode lamp-plates.In Figure 1A
In, light-emitting diode lamp-plate 110 has a plurality of drives line C1~C9, and multiple light emitting diodes are then configured in drives line respectively
C1~C9 wherein to two centre.In light-emitting diode lamp-plate 110,11~LED13 of LED is respectively to send
The light emitting diode of different wave length visible ray.Wherein, when LED 13 is lit and LED 11 and
When LED12 need not be lit, drives line C4 is endowed the drive signal of high-voltage level, and drives line C3 is endowed low-voltage
The drive signal of level.At this moment, due to LED 11 and LED12 forward biases be serially connected in drives line C4 and
Between C3 and it may be switched on and produce ghost phenomena.
In fig. ib, light-emitting diode lamp-plate 120 has a plurality of drives line C1~C9 and configuration therebetween multiple luminous
Diode.In light-emitting diode lamp-plate 120,21~LED23 of LED is respectively to send different wave length visible ray
Light emitting diode, also, need to be lit when LED 21 and LED 22 and LED23 are not required to be lit
When, drives line C1 is endowed the drive signal of high-voltage level, and drives line C2 then needs to be endowed the driving letter of low voltage level
Number.Consequently, it is possible to which LED 22 and LED23 that forward bias is serially connected between drives line C1 and C2 will likely be led
Lead to and produce ghost phenomena.
In fig. 1 c, light-emitting diode lamp-plate 130 has a plurality of drives line C1~C17 and configuration therebetween multiple luminous
Diode.In light-emitting diode lamp-plate 130,31~LED32 of LED is respectively to send different wave length visible ray
Light emitting diode, also, need to be lit when LED 31 and LED 32 be not required to be lit when, driving
Line C1 will be endowed the drive signal of high-voltage level, and drives line C10 will be endowed the drive signal of low voltage level.Herein
Simultaneously as the voltage level on the drives line C12 that the negative electrode of LED 32 is connected is unknown, and therefore, light-emitting diodes
Pipe LED32 is possible to be switched on according to the drive signal of high-voltage level on drives line C1, produces ghost phenomena.
The content of the invention
The present invention provides a kind of light-emitting device and its drive circuit, can effectively drop the generation for lowering ghost phenomena.
The LED driving circuit of the present invention is used to drive light-emitting diode lamp-plate.LED driving circuit bag
Include driving signal generator and offset voltage provider.Driving signal generator is in sweep time interval offer the first driving letter
Number to the first drives line, and the second drive signal to the second drives line is provided, wherein the first drives line connects the first light-emitting diodes
The first end of pipe, the second end of the first light emitting diode is commonly connected to the second driving with the second end of the second light emitting diode
Line.Offset voltage provider provides offset voltage to the 3rd drives line in the very first time during sweep time is interval is interval, and
Threshold voltage according to the second light emitting diode adjusts offset voltage and made in the second time interval during sweep time is interval
3rd drives line on-fixed is connected, wherein the first end of the second light emitting diode is connected to the 3rd drives line.Wherein second driving
The voltage difference of signal and the first drive signal is more than the threshold voltage of the first light emitting diode, the second drive signal and offset voltage
Voltage difference be less than the second light emitting diode threshold voltage.Second time interval is after the very first time is interval.
In one embodiment of this invention, the time length in interval of the above-mentioned very first time is according to the 3rd drives line and reference
The capacitance size of parasitic capacitance between earth terminal and determine.
In one embodiment of this invention, above-mentioned light-emitting diode lamp-plate also includes the 3rd light emitting diode.3rd hair
Between optical diode is connected between the 3rd drives line and the first drives line.Offset voltage provider and according to the second light emitting diode
Threshold voltage and the threshold voltage of the 3rd light emitting diode adjust offset voltage.
In one embodiment of this invention, above-mentioned offset voltage and the voltage difference of the first drive signal are less than the 3rd and lighted
The threshold voltage of diode.
In one embodiment of this invention, the first above-mentioned light emitting diode, the second light emitting diode and the 3rd are luminous
Diode produces three kinds of visible rays of different wave length or produces the visible ray of phase co-wavelength respectively.
In one embodiment of this invention, above-mentioned offset voltage provider includes offset voltage offer unit, compensation electricity
Pressure, which provides unit, includes selector.Selector receives multiple voltages to be selected and selection signal, and according to selection signal to select
One of voltage to be selected to produce offset voltage, wherein, selection signal according to the second light emitting diode threshold voltage come
Produce.
In one embodiment of this invention, above-mentioned selector includes multiple switch.The first end of switch is received respectively to be treated
Voltage is selected, the second end of switch is commonly connected to the 3rd drives line, and switch is controlled by selection signal to be turned on or off.
In one embodiment of this invention, above-mentioned offset voltage provider also includes voltage adjuster.Voltage adjuster
According to input voltage to produce voltage to be selected.
In one embodiment of this invention, above-mentioned driving signal generator includes multiple drivers.Each drive circuit bag
Include current source, first switch and second switch.First switch is connected between current source drives line corresponding with each drive circuit.
Second switch is connected to the corresponding drives line of each drive circuit and with reference between ground voltage.Wherein, each drive circuit is corresponding drives
Magnitude of voltage on moving-wire is turned on or off state to determine according to first switch and second switch, first switch and second switch
Do not simultaneously turn on.
The light-emitting device of the present invention includes light-emitting diode lamp-plate and LED driving circuit.LED light lamp
Plate has an a plurality of drives line, and including the first light emitting diode and the second light emitting diode, wherein the first light emitting diode
First end is connected to the first drives line in drives line, the second end of the first light emitting diode and the second of the second light emitting diode
End is commonly connected to the second drives line in drives line.LED driving circuit includes driving signal generator and compensation
Voltage provider.Driving signal generator sweep time interval the first drive signal to the first drives line is provided, and provide the
Two driving signal is to the second drives line, wherein the first drives line connects the first end of the first light emitting diode, the first light-emitting diodes
Second end of pipe is commonly connected to the second drives line with the second end of the second light emitting diode.Offset voltage provider is in scanning
Between very first time in interval it is interval in provide offset voltage to the 3rd drives line, and according to the threshold value electricity of the second light emitting diode
Pressure adjustment offset voltage, and connect the 3rd drives line on-fixed in the second time interval during sweep time is interval.Wherein
The first end of second light emitting diode is connected to the 3rd drives line.The wherein voltage difference of the second drive signal and the first drive signal
More than the threshold voltage of the first light emitting diode, the voltage difference of the second drive signal and offset voltage is less than the second light emitting diode
Threshold voltage, and the second time interval is after the very first time is interval.
Based on above-mentioned, of the invention LED driving circuit by providing offset voltage to non-lit up luminous two
One end of pole pipe, so that the voltage difference of the forward bias voltage drop between two end points of non-lit up light emitting diode is less than its threshold value
Voltage.Consequently, it is possible to which non-lit up light emitting diode can keep the state being not turned on, reduction produces the possibility of ghost.
For the features described above and advantage of the present invention can be become apparent, special embodiment below, and coordinate institute's accompanying drawings
It is described in detail below.
Brief description of the drawings
Figure 1A~Fig. 1 C are respectively various forms of light-emitting diode lamp-plates.
Fig. 2A is the schematic diagram of the LED driving circuit of one embodiment of the invention.
Fig. 2 B are the movement oscillogram of the LED driving circuit of the embodiment of the present invention.
Fig. 3 is the schematic diagram of the LED driving circuit of another embodiment of the present invention.
Fig. 4 provides the schematic diagram of the embodiment of unit and driver for the offset voltage of the embodiment of the present invention.
Fig. 5 is the schematic diagram of the voltage adjuster of the embodiment of the present invention.
Fig. 6 is the schematic diagram of the light-emitting device of one embodiment of the invention.
Description of reference numerals
LED11~LED13, LED21~LED23, LED31, LED32：Light emitting diode
200、300：LED driving circuit
201、301：Light-emitting diode lamp-plate
210、310：Driving signal generator
220、320：Offset voltage provider
410：Offset voltage provides unit
420：Driver
411：Selector
500：Voltage adjuster
510：Bleeder circuit
520：Buffer
600：Light-emitting device
620：Light-emitting diode lamp-plate
610：LED driving circuit
LD21, LD22, LD31~LD33：Light emitting diode
C1~C12, CX：Drives line
VC：Offset voltage
GND：With reference to earth terminal
CPAR：Parasitic capacitance
SW1~SWN, SWD1, SWD2：Switch
SCODE：Selection signal
VR_1~VR_N, VRX：Voltage to be selected
VDD：Supply voltage
IS1：Current source
OP1：Operational amplifier
VIN：Input voltage
VFB：Feedback voltage
VO：Output voltage
TSACN：Sweep time is interval
T1：The very first time is interval
T2：The very first time is interval
TT1：Time interval
SC1、SC2：Drive signal
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with specific embodiment, and reference
Accompanying drawing, the present invention is described in further detail.
Fig. 2A is refer to below, and Fig. 2A is the schematic diagram of the LED driving circuit of one embodiment of the invention.It is luminous
Diode drive circuit 200 is connected to light-emitting diode lamp-plate 201, and included in light-emitting diode lamp-plate 201 for driving
Multiple light emitting diodes.LED driving circuit 200 includes driving signal generator 210 and offset voltage provider
220.In the present embodiment, light-emitting diode lamp-plate 201 includes one or more light emitting diode LD21 and one or many
Individual light emitting diode LD22.Wherein light emitting diode LD21 first end (being, for example, negative electrode) is connected to drives line C1, lights
Diode LD21 the second end (being, for example, anode) is connected to drives line C2, and light emitting diode LD22 first end (is, for example,
Negative electrode) drives line C3 is connected to, light emitting diode LD22 the second end (being, for example, anode) is connected to drives line C2.Light-emitting diodes
Pipe LD21 and LD22 are used for the visible ray for producing different wave length respectively or the visible ray for producing phase co-wavelength.
When light emitting diode LD21 to be made is lit in corresponding sweep time interval, driving signal generator 210
The drive signal of high-voltage level can be provided in sweep time is interval in drives line C2, and the driving letter of low voltage level is provided
Number to drives line C1.The voltage difference of drive signal and the drive signal on drives line C1 on drives line C2 is more than light emitting diode
LD21 threshold voltage, and light emitting diode LD21 is switched on and is lit.At the same time, offset voltage provider 220 can
Very first time interval in sweep time is interval provides offset voltage VC to drives line C3, and makes light emitting diode LD22 positive
It is biased between drives line C2 drive signal and offset voltage VC.It is noted that offset voltage provider 220 provides compensation
Voltage VC can be adjusted according to light emitting diode LD22 threshold voltage, it is preferred that emphasis is, drives line C2 drive signal
And offset voltage VC voltage difference is less than light emitting diode LD22 threshold voltage.
Offset voltage provider 220 provides offset voltage VC and can connect for light emitting diode LD22 negative electrode with reference
Parasitic capacitance CPAR between ground terminal GND carries out charge or discharge action, and in the charge or discharge action as parasitic capacitance CPAR
After the completion of, offset voltage provider 220 can stop providing offset voltage VC extremely in the second time interval during sweep time is interval
Drives line C3, and drives line C3 is turned into the state that on-fixed connects (float).Consequently, it is possible in above-mentioned sweep time area
Between in, no matter how the voltage of the drive signal on drives line C1 changes, and the cross-pressure between light emitting diode LD22 two ends can be maintained
No more than its threshold voltage, and maintain the state being not turned on.Also therefore, the possibility for producing ghost occurs for light emitting diode LD22
Property will decline to a great extent.
In what is worth mentioning, the embodiment of the present invention, offset voltage provider 220 provides offset voltage VC voltage
Value can be adjusted.Wherein, according to different product batch numbers, different label, the light emitting diode of different threshold voltage,
Offset voltage provider 220 can carry out the adjustment of adaptability to provide offset voltage VC, and ensure without lighting up light-emitting diodes
Pipe is not turned on.Even, offset voltage provider 220 can also be according to threshold value of the light emitting diode caused by environmental factor electricity
Adjustment of the pressure drift to compensate voltage VC is acted, and thereby lifts luminous mass.
On the movement oscillogram of LED driving circuit in above-described embodiment, Fig. 2 B are refer to.Wherein, in scanning
High-voltage level is presented in time interval TT1 in time interval TSCAN, the drive signal SC2 for putting on drives line C2, and whole
In individual sweep time interval TSCAN, low voltage level is then presented in the drive signal SC1 for putting on drives line C1.In time interval
In TT1, the voltage difference between the drive signal SC1 and SC2 that are received between light emitting diode LD21 anodes and negative electrode is more than luminous two
Pole pipe LD21 threshold voltage, and correspond to switched on and launch visible ray.On the other hand, offset voltage VC is in sweep time
Very first time interval T1 in interval TSCAN is provided to drives line C3, and to drives line C3 and with reference between ground voltage GND
Parasitic capacitance CPAR carries out charge or discharge, and after the completion of being acted to parasitic capacitance CPAR charge or discharge, at second
Between interval T2 stop provide offset voltage VC to drives line C3 and make drives line C3 on-fixeds connect, to maintain light emitting diode
LD22 is maintained at the state being not turned on.
It is noted that very first time interval T1 time length can be according to drives line C3 and reference ground voltage GND
Between parasitic capacitance CPAR capacitance size set.Very first time interval T1 time length, which may be set to be higher by, posts
Raw electric capacity CPAR carries out one deviant of time needed for complete charge or discharge.
Subsidiary one carries, and in embodiments of the present invention, the drive signal SC2 for putting on drives line C2 is not required to sweep in complete
Retouch time interval TSCAN and be held at fixed high-voltage level.In fig. 2b, drive signal SC2 can after time interval TT1
Reduce its voltage level (threshold voltage for being approximately equal to light emitting diode LD21) and maintain after a period of time, it is non-to make drives line C2
It is fixedly connected with state.
Above-mentioned so-called on-fixed connection status, so that drives line C3 on-fixeds are connected as example, signified is exactly to make drive
Moving-wire C3 does not receive the state that voltage drives.Now, electric current is not had on drives line C3 to pass through.
Fig. 3 is refer to below, and Fig. 3 is the schematic diagram of the LED driving circuit of another embodiment of the present invention.It is luminous
Diode drive circuit 300 is connected to light-emitting diode lamp-plate 301, and included in light-emitting diode lamp-plate 301 for driving
Multiple light emitting diodes.LED driving circuit 300 includes driving signal generator 310 and offset voltage provider
320.In the present embodiment, light-emitting diode lamp-plate 301 includes one or more light emitting diode LD31, one or more
Light emitting diode LD32 and one or more light emitting diode LD33.Wherein light emitting diode LD31 first end is (for example
For negative electrode) drives line C1 is connected to, light emitting diode LD31 the second end and LD32 the second end (being, for example, anode) are common
It is connected to drives line C2, light emitting diode LD32 first end (being, for example, negative electrode) and light emitting diode LD33 the second end (example
Such as it is anode) drives line C3 is commonly connected to, and light emitting diode LD33 first end (being, for example, negative electrode) is then connected to driving
Line C1.Wherein light emitting diode LD31, LD32 and LD33 can for send different wave length visible ray.Certainly, in this hair
In bright other embodiment, light emitting diode LD31, LD32 and LD33 may also be used for sending the visible ray of phase co-wavelength.
When light emitting diode LD31 will be lit and light emitting diode LD32 and LD33 are not required to be lit, drive signal production
Raw device 310 can transmit the drive signal of high-voltage level to drives line C2 and transmit the drive signal of low voltage level to drives line
C1, wherein, the voltage difference of drive signal and the drive signal on drives line C1 on drives line C2 is more than light emitting diode LD31
Threshold voltage.Therefore, light emitting diode LD31 will be switched on and correspondingly be lit.At the same time, offset voltage provider 320
And offset voltage VC is provided to drives line C3, and make drives line C3 and with reference to the parasitic capacitance CPAR between earth terminal GND according to drive
Offset voltage VC on moving-wire C3 and by quick charge or discharge.
According to above-mentioned explanation it is known that after the completion of parasitic capacitance CPAR charge or discharge action, lighting two
Pole pipe LD32 forward biases are between the drive signal on drives line C2 and offset voltage VC, and light emitting diode LD33 then forward bias
It is pressed on offset voltage VC and sweeps between drives line C1 drive signal.That is, offset voltage provider 320 can be according to luminous two
Pole pipe LD32 and light emitting diode LD33 threshold voltage compensate voltage VC adjustment, make the driving on drives line C2
Voltage difference between signal and offset voltage VC is less than light emitting diode LD32 threshold voltage, and makes offset voltage VC and sweep driving
Voltage difference between line C1 drive signal is less than light emitting diode LD33 threshold voltage.Consequently, it is possible to light emitting diode LD32
And LD33 produces ghost phenomena in this time all without being switched on, and can effectively lift luminous mass.
In the present embodiment, lighted if the voltage difference of the drive signal between drives line C2 and drives line C1 is less than or equal to
The summation of diode LD33 and LD32 threshold voltage, represents that light emitting diode LD33 and LD32 may be because of drives line C2
And drive signal on drives line C1 and produce ghost, now, ghost eliminates mechanism and need to be activated, offset voltage provider
320 can provide offset voltage VC to drives line C3, and distinguish the cross-pressure between its two ends of light emitting diode LD33 and LD32
Less than its threshold voltage, therefore reduce the possibility that ghost is produced.And be less than when the magnitude of voltage of the drive signal on drives line C2
During the magnitude of voltage of the drive signal on drives line C1, offset voltage provider 320 can also start ghost and eliminate mechanism to provide
Offset voltage VC makes the cross-pressure between its two ends of light emitting diode LD33 and LD32 be respectively smaller than its threshold value electricity to drives line C3
Pressure.
Fig. 4 is refer to below, and Fig. 4 provides the embodiment of unit and driver for the offset voltage of the embodiment of the present invention
Schematic diagram.Wherein offset voltage provides unit 410 and configured in the offset voltage provider of previous embodiment, and driver
420 are configurable in the driving signal generator of previous embodiment.In Fig. 4, offset voltage provider 410 and drive signal
Generator 420 is commonly connected to identical drives line CX, and provides drives line CX drive signals or offset voltage.
Offset voltage, which provides unit 410, includes selector 411, and selector 411 receives multiple voltage VR_1~VR_N to be selected,
And select one of voltage VR_1~VR_N to be selected to be used as offset voltage according to selection signal SCODE.Selector 411
It can be made up of multiple switch SW1~SWN, wherein switch SW1~SWN first end receives voltage VR_1~VR_ to be selected respectively
N, switch SW1~SWN the second end is commonly connected to drives line CX.SW1~SWN is switched according to selection signal SCODE to turn on
Or be disconnected, selection signal SCODE can then be produced according to the threshold voltage for the light emitting diode for producing ghost phenomena.Wherein open
Close at most one meeting in SW1~SWN to be switched on to produce offset voltage, and the state of ghost elimination mechanism need not started
Under, switch SW1~SWN can be all disconnected.
Driver 420 includes current source IS1 and switch SWD1 and SWD2.Current source IS1 receives supply voltage VDD,
Switch SWD1 is connected between current source IS1 and drives line CX, and is switched SWD2 and be then connected to reference to earth terminal GND and driving
Between line CX.When driver 420 will provide drive signal to drives line CX, switch one of SWD1 and SWD2 can be led
Logical (wherein another to be disconnected).For example, when driver 420 will provide the drive signal of drives line CX high-voltage levels
When, beginning SWD1 is switched on and switchs SWD2 and be disconnected.Current source IS1 provides current to drives line CX and improved on drives line CX
Driving voltage.Relative, when driver 420 will provide the drive signal of drives line CX low voltage levels, switch SWD1 quilts
Disconnect and switch SWD2 and be switched on, the voltage of the drive signal on drives line CX can be pulled low according to reference to ground voltage GND.When
So, when switch SWD1 and SWD2 is disconnected, on-fixed connection can be presented in the drive signal on drives line CX
(floating) state.
Fig. 5 is refer to below, and Fig. 5 is the schematic diagram of the voltage adjuster of the embodiment of the present invention.Wherein, the embodiment of the present invention
Offset voltage provider in may include voltage adjuster 500 to produce voltage VRX to be selected.In Figure 5, voltage adjuster 500
Can be by low drop-out voltage adjuster (LDO voltage regulator) be come construction.Voltage adjuster 500 includes operation amplifier
Device OP1, transistor M1, bleeder circuit 510 and buffer 520.Operational amplifier OP1 receives input voltage VIN and feedback
Voltage VFB, and produce controlling transistor M1 is biased to produce output voltage VO.Bleeder circuit 510 enters for output voltage VO
Row partial pressure simultaneously produces multiple branch pressure voltages and feedback voltage V FB.Buffer 520 receives branch pressure voltage, and according to branch pressure voltage
Produce multiple voltage VRX to be selected.
In the present embodiment, buffer 520 can be by multiple voltage followers (voltage follower) be come construction.
It is noted that the embodiment of the voltage adjuster 500 of Fig. 5 descriptions is merely an example, voltage VRX to be selected
Can also be using any device for generating voltage well-known to those skilled in the art come construction, not fixed limitation.
Fig. 6 is refer to below, and Fig. 6 is the schematic diagram of the light-emitting device of one embodiment of the invention.Light-emitting device 600 includes hair
Optical diode lamp plate 620 and LED driving circuit 610.LED driving circuit 610 is connected to light-emitting diodes
Drives line CX on spot plate 620, and provide drive signal or offset voltage by drives line CX.
Light-emitting diode lamp-plate 620 can be the light-emitting diode lamp-plate 110~130 such as Figure 1A~Fig. 1 C, or can also
It is other kinds of light-emitting diode lamp-plate.LED driving circuit 610 can then utilize luminous the two of previous embodiment
Pole pipe drive circuit 200,300 is implemented.
In summary, the present invention makes not setting by providing offset voltage and is lit and there may be luminous the two of ghost
The cross-pressure that pole pipe is received be less than its threshold voltage, consequently, it is possible to do not set the light emitting diode being lit will not be lit and
Ghost is produced, the luminous mass of light-emitting device can be effectively lifted.
Although the present invention is disclosed above with embodiment, so it is not intended to limit the present invention, any art
Middle tool usually intellectual, without departing from the spirit and scope of the present invention, when a little change and retouching can be made, thus it is of the invention
Protection domain when depending on being defined that appended claims scope is defined.
Claims (14)
1. a kind of LED driving circuit, for driving a light-emitting diode lamp-plate, and the light-emitting diode lamp-plate has
There are one first light emitting diode and one second light emitting diode, including：
One driving signal generator, provides one first drive signal to the first drives line, and provide in one scan time interval
One second drive signal to one second drives line, wherein first drives line is connected to the first of first light emitting diode
Second end of end, the second end of first light emitting diode and second light emitting diode is commonly connected to described second and driven
Moving-wire；And
One offset voltage provider, an offset voltage is provided to one in the very first time during the sweep time is interval is interval
3rd drives line, and the offset voltage is adjusted according to the threshold voltage of second light emitting diode, and in the scanning
Between connect the 3rd drives line on-fixed in one second time interval in interval, wherein second light emitting diode
First end is connected to the 3rd drives line,
Wherein, the voltage difference of second drive signal and first drive signal is more than the threshold of first light emitting diode
The voltage difference of threshold voltage, second drive signal and the offset voltage is less than the threshold value electricity of second light emitting diode
Pressure, and second time interval is after the very first time is interval.
2. LED driving circuit as claimed in claim 1, wherein, the time length foundation in the very first time interval
3rd drives line and one is determined with reference to the capacitance size of the parasitic capacitance between earth terminal.
3. LED driving circuit as claimed in claim 1, wherein, the light-emitting diode lamp-plate also includes one the 3rd
Light emitting diode, it is described between the 3rd light emitting diode is connected between the 3rd drives line and first drives line
Offset voltage provider and threshold voltage and the threshold value of the 3rd light emitting diode according to second light emitting diode
Voltage adjusts the offset voltage.
4. LED driving circuit as claimed in claim 3, wherein, the offset voltage and first drive signal
Voltage difference be less than the 3rd light emitting diode threshold voltage.
5. LED driving circuit as claimed in claim 3, wherein, first light emitting diode, second hair
Optical diode and the 3rd light emitting diode produce three kinds of visible rays of different wave length respectively, or, described first lights
Diode, second light emitting diode and the 3rd light emitting diode produce the visible ray of phase co-wavelength.
6. LED driving circuit as claimed in claim 1, wherein, the offset voltage provider includes a compensation electricity
Pressure provides unit, and the offset voltage, which provides unit, to be included：
One selector, receives multiple voltages to be selected and a selection signal, and described to be selected to select according to the selection signal
One of voltage is to produce the offset voltage, wherein threshold value of the selection signal according to second light emitting diode
Voltage is produced.
7. LED driving circuit as claimed in claim 6, wherein, the selector includes multiple switch, described to open
The first end of pass receives the voltage to be selected respectively, and the second end of the switch is commonly connected to the 3rd drives line, described
Switch is controlled by the selection signal to be turned on or off.
8. LED driving circuit as claimed in claim 6, wherein, the offset voltage provider also includes：
One voltage adjuster, according to an input voltage to produce the voltage to be selected.
9. LED driving circuit as claimed in claim 1, wherein, the driving signal generator includes multiple drivings
Device, each driver includes：
One current source；
One first switch, is connected between current source drives line corresponding with each driver；And
One second switch, is connected between the corresponding drives line of each driver and a reference ground voltage,
Wherein, the leading according to the first switch and the second switch of the magnitude of voltage in the corresponding drives line of each driver
On-off open state determines that the first switch and the second switch do not simultaneously turn on.
10. a kind of light-emitting device, including：
One light-emitting diode lamp-plate, with a plurality of drives line, and including one first light emitting diode and one second light-emitting diodes
Pipe, wherein the first end of first light emitting diode is connected to one first drives line in the drives line, first hair
Second end of optical diode and the second end of one second light emitting diode are commonly connected to one second driving in the drives line
Line；And
One LED driving circuit, connects the drives line, including：
One driving signal generator, provides one first drive signal to first drives line in one scan time interval, and
One second drive signal is provided to second drives line；And
One offset voltage provider, an offset voltage is provided to one in the very first time during the sweep time is interval is interval
3rd drives line, and the offset voltage is adjusted according to the threshold voltage of second light emitting diode, and in the scanning
Between connect the 3rd drives line on-fixed in one second time interval in interval, wherein second light emitting diode
First end is connected to the 3rd drives line,
Wherein, the voltage difference of second drive signal and first drive signal is more than the threshold of first light emitting diode
The voltage difference of threshold voltage, second drive signal and the offset voltage is less than the threshold value electricity of second light emitting diode
Pressure, and second time interval is after the very first time is interval.
11. light-emitting device as claimed in claim 10, wherein, the time length in the very first time interval is according to the described 3rd
Drives line and one is determined with reference to the capacitance size of the parasitic capacitance between earth terminal.
12. light-emitting device as claimed in claim 10, wherein, the light-emitting diode lamp-plate also includes one the 3rd light-emitting diodes
Pipe, between the 3rd light emitting diode is connected between the 3rd drives line and first drives line, the offset voltage
Provider and threshold voltage and the threshold voltage of the 3rd light emitting diode according to second light emitting diode is to adjust
State offset voltage.
13. light-emitting device as claimed in claim 12, wherein, the offset voltage and the voltage difference of first drive signal
Less than the threshold voltage of the 3rd light emitting diode.
14. light-emitting device as claimed in claim 12, wherein, first light emitting diode, second light emitting diode
And the 3rd light emitting diode produces three kinds of visible rays of different wave length respectively, or, first light emitting diode, institute
State the second light emitting diode and the 3rd light emitting diode produces the visible ray of phase co-wavelength.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW105116929 | 2016-05-30 | ||
| TW105116929A TWI584245B (en) | 2016-05-30 | 2016-05-30 | Light emitting apparatus and light emitting diode driving circuit thereof |
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| Publication Number | Publication Date |
|---|---|
| CN107222947A true CN107222947A (en) | 2017-09-29 |
| CN107222947B CN107222947B (en) | 2018-12-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710320429.2A Active CN107222947B (en) | 2016-05-30 | 2017-05-09 | Light emitting device and light emitting diode driving circuit |
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| Country | Link |
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| CN (1) | CN107222947B (en) |
| TW (1) | TWI584245B (en) |
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|---|---|---|---|---|
| TWI680445B (en) * | 2018-11-16 | 2019-12-21 | 友達光電股份有限公司 | Driving circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070171271A1 (en) * | 2006-01-26 | 2007-07-26 | Au Optronics Corp. | Driver and method for driving a semiconductor light emitting device array |
| CN102474949A (en) * | 2009-12-22 | 2012-05-23 | 夏普株式会社 | Surface light emitting device |
| CN102479488A (en) * | 2010-11-23 | 2012-05-30 | 三星电子株式会社 | Circuit and method of driving light emitting diodes, and light emitting diode system having the same |
| CN103999552A (en) * | 2011-12-16 | 2014-08-20 | 首尔半导体株式会社 | LED driving device |
-
2016
- 2016-05-30 TW TW105116929A patent/TWI584245B/en active
-
2017
- 2017-05-09 CN CN201710320429.2A patent/CN107222947B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070171271A1 (en) * | 2006-01-26 | 2007-07-26 | Au Optronics Corp. | Driver and method for driving a semiconductor light emitting device array |
| CN102474949A (en) * | 2009-12-22 | 2012-05-23 | 夏普株式会社 | Surface light emitting device |
| CN102479488A (en) * | 2010-11-23 | 2012-05-30 | 三星电子株式会社 | Circuit and method of driving light emitting diodes, and light emitting diode system having the same |
| CN103999552A (en) * | 2011-12-16 | 2014-08-20 | 首尔半导体株式会社 | LED driving device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107222947B (en) | 2018-12-11 |
| TW201742041A (en) | 2017-12-01 |
| TWI584245B (en) | 2017-05-21 |
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