CN107222947B - 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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- CN107222947B CN107222947B CN201710320429.2A CN201710320429A CN107222947B CN 107222947 B CN107222947 B CN 107222947B CN 201710320429 A CN201710320429 A CN 201710320429A CN 107222947 B CN107222947 B CN 107222947B
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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
It is residual to eliminate to can provide offset voltage the present invention relates to a kind of light emitting device and its driving circuit more particularly to one kind
The light emitting device and its driving circuit of shadow.
Background technique
In the known light emitting device as composed by diode, the light-emitting diode lamp-plate of diversified forms is provided.Wherein,
Various forms of light-emitting diode lamp-plates are respectively provided with the configuration mode of the light emitting diode of different modes.Although carrying out this
When the design of the configuration mode of the light emitting diode of a little light-emitting diode lamp-plates, have issuable for institute when actually lighting
Ghost phenomena is considered, but in practical operation, when light-emitting diode lamp-plate is lit, is still had a certain number of residual
Shadow phenomenon not can avoid, and illumination effect is caused to be destroyed.
Figure 1A~Fig. 1 C is please referred to below, and Figure 1A~Fig. 1 C is respectively various forms of light-emitting diode lamp-plates.In Figure 1A
In, light-emitting diode lamp-plate 110 has a plurality of driving line C1~C9, and multiple light emitting diodes are then configured in driving line respectively
C1~C9 wherein to two centre.In light-emitting diode lamp-plate 110,11~LED13 of Light-emitting diode LED is respectively to send
The light emitting diode of different wave length visible light.Wherein, when Light-emitting diode LED 13 is lit and Light-emitting diode LED 11 and
When LED12 does not need to be lit, driving line C4 is endowed the driving signal of high-voltage level, and line C3 is driven to be endowed low-voltage
The driving signal of level.At this moment, due to Light-emitting diode LED 11 and LED12 forward bias be serially connected in driving line C4 and
Between C3 and it may be switched on and generate ghost phenomena.
In fig. ib, light-emitting diode lamp-plate 120 have it is a plurality of driving line C1~C9 and configuration therebetween it is multiple shine
Diode.In light-emitting diode lamp-plate 120,21~LED23 of Light-emitting diode LED is respectively to send different wave length visible light
Light emitting diode, also, need to be lit and Light-emitting diode LED 22 and LED23 are not required to be lit when Light-emitting diode LED 21
When, driving line C1 is endowed the driving signal of high-voltage level, and driving line C2 then needs the driving letter for being endowed low voltage level
Number.In this way, which Light-emitting diode LED 22 and LED23 that forward bias is serially connected between driving line C1 and C2 will likely be led
Lead to and generates ghost phenomena.
In fig. 1 c, light-emitting diode lamp-plate 130 have it is a plurality of driving line C1~C17 and configuration therebetween it is multiple shine
Diode.In light-emitting diode lamp-plate 130,31~LED32 of Light-emitting diode LED is respectively to send different wave length visible light
Light emitting diode, also, need to be lit when Light-emitting diode LED 31 and Light-emitting diode LED 32 be not required to be lit when, driving
Line C1 will be endowed the driving signal of high-voltage level, and drive line C10 that will be endowed the driving signal of low voltage level.Herein
Simultaneously as the voltage level on the driving line C12 that the cathode of Light-emitting diode LED 32 is connected is unknown, and therefore, light-emitting diodes
Pipe LED32 is possible to be switched on according to the driving signal of high-voltage level on driving line C1, generates ghost phenomena.
Summary of the invention
The present invention provides a kind of light emitting device and its driving circuit, can effectively drop the generation for lowering ghost phenomena.
LED driving circuit of the invention is for driving light-emitting diode lamp-plate.LED driving circuit packet
Include driving signal generator and offset voltage provider.Driving signal generator provides the first driving letter in sweep time section
Number to first driving line, and provide the second driving signal to second driving line, wherein first driving line connect the first light-emitting diodes
The second end of the first end of pipe, the second end of the first light emitting diode and the second light emitting diode is commonly connected to the second driving
Line.Offset voltage provider provides offset voltage to third in the first time section in sweep time section and drives line, and
Make in the threshold voltage adjustment offset voltage of the second light emitting diode of foundation and the second time interval in sweep time section
Third drives the connection of line on-fixed, wherein the first end of the second light emitting diode is connected to third driving line.Wherein the second driving
The voltage difference of signal and the first driving signal is greater than the threshold voltage of the first light emitting diode, the second driving signal and offset voltage
Voltage difference less than the second light emitting diode threshold voltage.Second time interval is after first time section.
In one embodiment of this invention, the length of time in above-mentioned first time section is according to third driving line and reference
The capacitance size of parasitic capacitance between ground terminal and determine.
In one embodiment of this invention, above-mentioned light-emitting diode lamp-plate further includes third light emitting diode.Third hair
Between optical diode is connected between third driving line and the first driving line.Offset voltage provider and the second light emitting diode of foundation
Threshold voltage and the threshold voltage of third light emitting diode adjust offset voltage.
In one embodiment of this invention, the voltage difference of above-mentioned offset voltage and the first driving signal shines less than third
The threshold voltage of diode.
In one embodiment of this invention, the first above-mentioned light emitting diode, the second light emitting diode and third shine
Diode generates three kinds of visible lights of different wave length respectively or generates the visible light of phase co-wavelength.
In one embodiment of this invention, above-mentioned offset voltage provider includes that offset voltage provides unit, compensation electricity
It includes selector that pressure, which provides unit,.Selector receives multiple voltages to be selected and selection signal, and according to selection signal to select
One of voltage to be selected is to generate offset voltage, wherein selection signal is come according to the threshold voltage of the second light emitting diode
It generates.
In one embodiment of this invention, above-mentioned selector includes multiple switch.The first end of switch receive respectively to
Voltage is selected, the second end of switch is commonly connected to third driving 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 further includes voltage adjuster.Voltage adjuster
According to input voltage to generate voltage to be selected.
In one embodiment of this invention, above-mentioned driving signal generator includes multiple drivers.Each driving circuit packet
Include current source, first switch and second switch.First switch is connected between current source driving line corresponding with each driving circuit.
Second switch is connected to the corresponding driving line of each driving circuit and with reference between ground voltage.Wherein, the corresponding drive of each driving circuit
Voltage value on moving-wire is turned on or off state according to first switch and second switch to determine, first switch and second switch
It does not simultaneously turn on.
Light emitting device of the invention includes light-emitting diode lamp-plate and LED driving circuit.LED light lamp
Plate has a plurality of driving 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 driving line in driving 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 driving line in driving line.LED driving circuit includes driving signal generator and compensation
Voltage provider.Driving signal generator provides the first driving signal to the first driving line in sweep time section, and provides the
Two driving signal is to the second driving line, wherein the first driving line connects the first end of the first light emitting diode, the first light-emitting diodes
The second end of pipe and the second end of the second light emitting diode are commonly connected to the second driving line.Offset voltage provider is in scanning
Between provide offset voltage to third in first time section in section and drive line, and according to the threshold value of the second light emitting diode electricity
Pressure adjustment offset voltage, and make third driving line on-fixed connection in the second time interval in sweep time section.Wherein
The first end of second light emitting diode is connected to third driving line.The wherein voltage difference of the second driving signal and the first driving signal
Greater than the threshold voltage of the first light emitting diode, the voltage difference of the second driving signal and offset voltage is less than the second light emitting diode
Threshold voltage, and the second time interval is after first time section.
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 endpoints of non-lit up light emitting diode be made to be less than its threshold value
Voltage.In this way, which non-lit up light emitting diode can keep the state not being switched on, the possibility for generating ghost is reduced.
To make the foregoing features and advantages of the present invention clearer and more comprehensible, special embodiment below, and cooperate institute's accompanying drawings
It is described in detail below.
Detailed description of the invention
Figure 1A~Fig. 1 C is 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 is 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 symbols
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: driving line
VC: offset voltage
GND: ground terminal is referred to
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 section
T1: first time section
T2: first time section
TT1: time interval
SC1, SC2: driving signal
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in further detail.
A, Fig. 2A are the schematic diagram of the LED driving circuit of one embodiment of the invention referring to figure 2. below.It shines
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 LD21 and one or more of the light-emitting diode lamp-plate 201 including one or more
A light emitting diode LD22.Wherein the first end (e.g. cathode) of light emitting diode LD21 is connected to driving line C1, shines
The second end (e.g. anode) of diode LD21 is connected to driving line C2, and the first end of light emitting diode LD22 is (e.g.
Cathode) it is connected to driving line C3, the second end (e.g. anode) of light emitting diode LD22 is connected to driving line C2.Light-emitting diodes
Pipe LD21 and LD22 are for generating the visible light of different wave length respectively or generating the visible light of phase co-wavelength.
When light emitting diode LD21 to be made is lit in corresponding sweep time section, driving signal generator 210
The driving signal of high-voltage level can be provided in sweep time section in driving line C2, and the driving letter of low voltage level is provided
Number to driving line C1.The voltage difference of the driving signal on driving signal and driving the line C1 on line C2 is driven to be greater than light emitting diode
The threshold voltage of LD21, and light emitting diode LD21 is made to be switched on and be lit.At the same time, offset voltage provider 220 can
First time section in sweep time section provides offset voltage VC to driving line C3, and keeps light emitting diode LD22 positive
It is biased between the driving signal and offset voltage VC of driving line C2.It is noted that offset voltage provider 220 provides compensation
Voltage VC can be adjusted according to the threshold voltage of light emitting diode LD22, it is preferred that emphasis is, drive the driving signal of line C2
And the voltage difference of offset voltage VC is less than the threshold voltage of light emitting diode LD22.
The there is provided offset voltage VC of offset voltage provider 220 can connect for the cathode of light emitting diode LD22 with reference
Parasitic capacitance CPAR between ground terminal GND carries out charge or discharge movement, and acts in the charge or discharge as parasitic capacitance CPAR
After the completion, offset voltage provider 220 can stop providing offset voltage VC extremely in the second time interval in sweep time section
Line C3 is driven, and makes the state for driving line C3 to become on-fixed connection (float).In this way, in above-mentioned sweep time area
Between in, no matter drive how the voltage of the driving signal on line C1 changes, the cross-pressure between the both ends light emitting diode LD22 can maintain
No more than its threshold voltage, and maintain the state being not turned on.Also therefore, light emitting diode LD22 occurs to generate the possibility of ghost
Property will decline to a great extent.
What is worth mentioning, in the embodiment of the present invention, the voltage of the provided offset voltage VC of offset voltage provider 220
Value can be adjusted.Wherein, according to different product batch numbers, different label, different light emitting diodes 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 switched on.Even, offset voltage provider 220 can also be according to light emitting diode because of the threshold value electricity caused by environmental factor
Pressure drift acts to compensate the adjustment of voltage VC, and promotes luminous mass whereby.
About the movement oscillogram of LED driving circuit in above-described embodiment, B referring to figure 2..Wherein, it is scanning
High-voltage level is presented in time interval TT1 in time interval TSCAN, the driving signal SC2 for being applied to driving line C2, and whole
In a sweep time section TSCAN, low voltage level is then presented in the driving signal SC1 for being applied to driving line C1.In time interval
In TT1, between light emitting diode LD21 anode and cathode voltage difference between received driving signal SC1 and SC2 be greater than and shine two
The threshold voltage of pole pipe LD21, and correspond to and be switched on and launch visible light.On the other hand, offset voltage VC is in sweep time
First time section T1 in the TSCAN of section is provided to driving line C3, and to driving line C3 and with reference between ground voltage GND
Parasitic capacitance CPAR carries out charge or discharge, and after the completion of the charge or discharge movement to parasitic capacitance CPAR, at second
Between section T2 stop provide offset voltage VC to driving line C3 and make drive line C3 on-fixed connection, to maintain light emitting diode
LD22 is maintained at not state switched on.
It is noted that the length of time of first time section T1 can be according to driving line C3 and with reference to ground voltage GND
Between the capacitance size of parasitic capacitance CPAR set.The length of time of first time section T1, which may be set to be higher by, posts
One deviant of time needed for raw capacitor CPAR carries out complete charge or discharge.
Subsidiary one mentions, and in embodiments of the present invention, the driving signal SC2 for being applied to driving line C2 is not required to completely sweeping
It retouches time interval TSCAN and is held at fixed high-voltage level.In fig. 2b, driving signal SC2 can after time interval TT1
After reducing its voltage level (threshold voltage for being approximately equal to light emitting diode LD21) and maintaining a period of time, make to drive line C2 non-
It is fixedly connected with state.
Above-mentioned so-called on-fixed connection status, so that driving line C3 on-fixed is connected as example, signified is exactly to make to drive
Moving-wire C3 does not receive the state that voltage drives.Pass through at this point, not having electric current on driving line C3.
Below referring to figure 3., Fig. 3 is the schematic diagram of the LED driving circuit of another embodiment of the present invention.It shines
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
The light emitting diode LD33 of light emitting diode LD32 and one or more.Wherein light emitting diode LD31 first end (such as
For cathode) it is connected to driving line C1, the second end (for example, anode) of the second end of light emitting diode LD31 and LD32 are common
It is connected to the first end (for example, cathode) of driving line C2, light emitting diode LD32 and the second end (example of light emitting diode LD33
For example anode) it is commonly connected to driving line C3, and the first end (for example, cathode) of light emitting diode LD33 is then connected to driving
Line C1.Wherein light emitting diode LD31, LD32 and LD33 can be used to send the visible light of different wave length.Certainly, in this hair
In bright other embodiments, light emitting diode LD31, LD32 and LD33 can also be used to send the visible light 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, driving signal is produced
Raw device 310 can transmit the driving signal of high-voltage level to driving line C2 and transmit the driving signal of low voltage level to driving line
C1, wherein the voltage difference of the driving signal on driving line C2 and the driving signal on driving line C1 is greater than light emitting diode LD31
Threshold voltage.Therefore, light emitting diode LD31 will be switched on and correspondence is lit.At the same time, offset voltage provider 320
And offset voltage VC to driving line C3 is provided, and make to drive line C3 and drive with reference to the parasitic capacitance CPAR foundation between ground terminal GND
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 the charge or discharge movement of parasitic capacitance CPAR, luminous two
Pole pipe LD32 forward bias on driving line C2 driving signal and offset voltage VC between, and light emitting diode LD33 then forward bias
Be pressed on offset voltage VC and sweep driving line C1 driving signal between.That is, offset voltage provider 320 can be according to luminous two
The threshold voltage of pole pipe LD32 and light emitting diode LD33 compensate the adjustment of voltage VC, make to drive the driving on line C2
Voltage difference between signal and offset voltage VC is less than the threshold voltage of light emitting diode LD32, and makes offset voltage VC and sweep driving
Voltage difference between the driving signal of line C1 is less than the threshold voltage of light emitting diode LD33.In this way, light emitting diode LD32
And LD33 will not be switched in this time and generate ghost phenomena, can effectively promote luminous mass.
In the present embodiment, it shines if the voltage difference of the driving signal between driving line C2 and driving line C1 is less than or equal to
The summation of the threshold voltage of diode LD33 and LD32 indicates that light emitting diode LD33 and LD32 may be because of driving line C2
And drive the driving signal on line C1 and generate ghost, at this point, ghost is eliminated mechanism and need to be activated, offset voltage provider
320 can provide offset voltage VC to driving line C3, and distinguish the cross-pressure between its both ends light emitting diode LD33 and LD32
Less than its threshold voltage, therefore reduce the possibility that ghost generates.And it is less than when the voltage value of the driving signal on driving line C2
When driving the voltage value of the driving signal on line C1, offset voltage provider 320 also can star ghost and eliminate mechanism to provide
Offset voltage VC to driving line C3, and the cross-pressure between its both ends light emitting diode LD33 and LD32 is made to be respectively smaller than its threshold value electricity
Pressure.
Below referring to figure 4., 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 the configuration of unit 410 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 driving signal
Generator 420 is commonly connected to identical driving line CX, and provides driving line CX driving signal or offset voltage.
It includes selector 411 that offset voltage, which provides unit 410, 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 using as offset voltage according to selection signal SCODE.Selector 411
It can be made of multiple switch SW1~SWN, wherein the first end of switch SW1~SWN receives voltage VR_1~VR_ to be selected respectively
N, the second end of switch SW1~SWN are commonly connected to driving line CX.Switch SW1~SWN is according to selection signal SCODE to be connected
Or be disconnected, selection signal SCODE can then be generated according to the threshold voltage for the light emitting diode for generating ghost phenomena.Wherein open
It closes an at most meeting in SW1~SWN to be switched on to generate offset voltage, and in the state for not needing starting ghost elimination mechanism
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 driving line CX, and switch SWD2 is then connected to reference to ground terminal GND and driving
Between line CX.When driver 420 will provide driving signal to when driving line CX, one of switch SWD1 and SWD2 can be led
Logical (wherein another to be disconnected).For example, when driver 420 will provide the driving signal of driving line CX high-voltage level
When, beginning SWD1 is switched on and switch SWD2 is disconnected.Current source IS1 provides current to driving line CX and improves on driving line CX
Driving voltage.Opposite, when driver 420 will provide the driving signal of driving line CX low voltage level, switch SWD1 quilt
It disconnects and switch SWD2 is switched on, drives the voltage of driving signal on line CX that can be pulled low according to reference ground voltage GND.When
So, when switch SWD1 and SWD2 are disconnected, drive the driving signal on line CX that on-fixed connection can be presented
(floating) state.
Below referring to figure 5., 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 generate voltage VRX to be selected.In Fig. 5, voltage adjuster 500
It can be by low drop-out voltage adjuster (LDO voltage regulator) 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 generate and be biased to control transistor M1 to generate output voltage VO.Bleeder circuit 510 for output voltage VO into
Row divides and generates multiple branch pressure voltages and feedback voltage V FB.Buffer 520 receives branch pressure voltage, and according to branch pressure voltage
Generate multiple voltage VRX to be selected.
In the present embodiment, buffer 520 can be by multiple voltage followers (voltage follower) come construction.
It is noted that the embodiment of the voltage adjuster 500 of Fig. 5 description 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, the limitation do not fixed.
Fig. 6 is please referred 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
Driving line CX on spot plate 620, and driving signal or offset voltage are provided by driving 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 be with
It is other kinds of light-emitting diode lamp-plate.LED driving circuit 610 then can use luminous the two of previous embodiment
Pole pipe driving circuit 200,300 is implemented.
In conclusion the present invention makes not set to be lit by providing offset voltage shines two there may be ghost
The received cross-pressure of pole pipe institute is lower than its threshold voltage, in this way, do not set the light emitting diode being lit not and can be lit and
Ghost is generated, the luminous mass of light emitting device can be effectively promoted.
Although the present invention is disclosed above with embodiment, so it is not intended to limit the present invention, any technical field
Middle tool usually intellectual, without departing from the spirit and scope of the present invention, when can make some changes and embellishment, thus it is of the invention
Protection scope subject to be defined depending on appended claims range.
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, comprising:
One driving signal generator provides one first driving signal to the first driving line in a scanning time interval, and provides
One second driving signal to one second driving line, wherein the first driving line is connected to the first of first light emitting diode
The second end of end, the second end of first light emitting diode and second light emitting diode is commonly connected to described second and drives
Moving-wire；And
One offset voltage provider provides an offset voltage to one in the first time section in the sweep time section
Third drives line, and adjusts the offset voltage according to the threshold voltage of second light emitting diode, and in the scanning
Between become the third driving line in one second time interval in section not receive the state that voltage drives, i.e., third drives
Electric current is not had on line to pass through, wherein the first end of second light emitting diode is connected to the third driving line,
Wherein, the voltage difference of second driving signal and first driving signal is greater than the threshold of first light emitting diode
The voltage difference of threshold voltage, second driving 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 first time section.
2. LED driving circuit as described in claim 1, wherein the length of time foundation in the first time section
The third drives the capacitance size of the parasitic capacitance between line and a reference ground terminal and determines.
3. LED driving circuit as described in claim 1, wherein the light-emitting diode lamp-plate further includes a third
Light emitting diode, the third light emitting diode is connected to the third driving line and described first and drives between line, described
Offset voltage provider and threshold value according to the threshold voltage of second light emitting diode and the third light emitting diode
Voltage adjusts the offset voltage, wherein offset voltage provider is according to the second light emitting diode and third light-emitting diodes
The threshold voltage of pipe compensates the adjustment of voltage, makes the voltage between the driving signal and offset voltage on the second driving line
Difference and makes offset voltage and sweeps the voltage difference between the driving signal of the first driving line less than the threshold voltage of the second light emitting diode
Less than the threshold voltage of third light emitting diode.
4. LED driving circuit as claimed in claim 3, wherein the offset voltage and first driving signal
Voltage difference be less than the third 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 third light emitting diode generate three kinds of visible lights of different wave length respectively, alternatively, described first shines
Diode, second light emitting diode and the third light emitting diode generate the visible light of phase co-wavelength.
6. LED driving circuit as described in claim 1, wherein the offset voltage provider includes a compensation electricity
Pressure provides unit, and the offset voltage provides unit and includes:
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 generate the offset voltage, wherein threshold value of the selection signal according to second light emitting diode
Voltage generates.
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 third driving 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 further include:
One voltage adjuster, according to an input voltage to generate the voltage to be selected.
9. LED driving circuit as described in claim 1, wherein the driving signal generator includes multiple drivings
Device, each driver include:
One current source；
One first switch is connected between current source driving line corresponding with each driver；And
One second switch is connected between the corresponding driving line of each driver and a reference ground voltage,
Wherein, voltage value the leading according to the first switch and the second switch on the corresponding driving 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, comprising:
One light-emitting diode lamp-plate has a plurality of driving 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 driving line in the driving line, first hair
The second end of optical diode and the second end of one second light emitting diode are commonly connected to one second driving in the driving line
Line；And
One LED driving circuit connects the driving line, comprising:
One driving signal generator, one scanning time interval in provide one first driving signal to it is described first driving line, and
One second driving signal is provided to the second driving line；And
One offset voltage provider provides an offset voltage to one in the first time section in the sweep time section
Third drives line, and adjusts the offset voltage according to the threshold voltage of second light emitting diode, and in the scanning
Between become the third driving line in one second time interval in section not receive the state that voltage drives, i.e., third drives
Electric current is not had on line to pass through, wherein the first end of second light emitting diode is connected to the third driving line,
Wherein, the voltage difference of second driving signal and first driving signal is greater than the threshold of first light emitting diode
The voltage difference of threshold voltage, second driving 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 first time section.
11. light emitting device as claimed in claim 10, wherein the length of time in the first time section is according to the third
It drives the capacitance size of the parasitic capacitance between line and a reference ground terminal and determines.
12. light emitting device as claimed in claim 10, wherein the light-emitting diode lamp-plate further includes a third light-emitting diodes
Pipe, the third light emitting diode are connected to the third driving line and described first and drive between line, the offset voltage
Provider and according to the threshold voltage of second light emitting diode and the threshold voltage of third light emitting diode to adjust
State offset voltage, wherein offset voltage provider is according to the second light emitting diode and the threshold voltage of third light emitting diode
The adjustment of voltage is compensated, makes the voltage difference between the driving signal and offset voltage on the second driving line less than the second hair
The threshold voltage of optical diode, and the voltage difference for making offset voltage and sweeping between the driving signal of the first driving line shines less than third
The threshold voltage of diode.
13. light emitting device as claimed in claim 12, wherein the voltage difference of the offset voltage and first driving signal
Less than the threshold voltage of the third light emitting diode.
14. light emitting device as claimed in claim 12, wherein first light emitting diode, second light emitting diode
And the third light emitting diode generates three kinds of visible lights of different wave length respectively, alternatively, first light emitting diode, institute
It states the second light emitting diode and the third light emitting diode generates the visible light of phase co-wavelength.
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| 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 |
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| CN107222947A CN107222947A (en) | 2017-09-29 |
| CN107222947B true CN107222947B (en) | 2018-12-11 |
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| CN201710320429.2A Active CN107222947B (en) | 2016-05-30 | 2017-05-09 | Light emitting device and light emitting diode driving circuit |
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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 (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI341510B (en) * | 2006-01-26 | 2011-05-01 | Au Optronics Corp | Driver and driving method of semiconductor light emitting device array |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| Publication number | Publication date |
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| CN107222947A (en) | 2017-09-29 |
| TWI584245B (en) | 2017-05-21 |
| TW201742041A (en) | 2017-12-01 |
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