CN206498572U - Lamp device and lighting device - Google Patents
Lamp device and lighting device Download PDFInfo
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- CN206498572U CN206498572U CN201720224833.5U CN201720224833U CN206498572U CN 206498572 U CN206498572 U CN 206498572U CN 201720224833 U CN201720224833 U CN 201720224833U CN 206498572 U CN206498572 U CN 206498572U
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- light
- emitting component
- lighting circuit
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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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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model provides a kind of lamp device and lighting device.Lamp device and lighting device include control device, and control device is arranged on substrate, configures between the first lighting circuit and the second lighting circuit, the first lighting circuit and the second lighting circuit are controlled.Control device makes first switching element be switched with second switch element with different frequency in the case where making the first light-emitting component and the second light-emitting component be lighted with identical degree of dimming.
Description
Technical field
The utility model is related to a kind of lamp device and lighting device.
Background technology
It is that the different multiple light emitting diodes of colour temperature (light emitting diode, LED) are same in the prior art
When light lighting device to be mixed colours and dimmed.
Prior art literature
Patent document
Patent document 1：No. 5936086 publications of Japanese Patent No.
Utility model content
Utility model problem to be solved
According to embodiment there is provided the lamp device for the influence that can reduce switching noise (switching noise) with
And lighting device.
The technological means solved the problems, such as
The lamp device of embodiment includes：Substrate；Dc source, is installed on the substrate；First lighting circuit, peace
Dress on the substrate, is connected to the dc source, the first light-emitting component is lighted；Second lighting circuit, installed in described
On substrate, the dc source is connected to, will be first with being lighted with the second of the first light-emitting component identical forward voltage
Part is lighted；And control device, install on the substrate, configure in first lighting circuit and second lighting circuit
Between, first lighting circuit and second lighting circuit are controlled.First lighting circuit includes being connected to
First switching element between the dc source and first light-emitting component and it is connected to the first switching element and institute
State the first inductor between the first light-emitting component.Second lighting circuit includes being connected to the dc source and described the
Second switch element between two light emitting and be connected between the second switch element and second light-emitting component and
The second inductor with the inductance different from first inductor.The control device make first light-emitting component with
In the case that second light-emitting component is lighted with identical degree of dimming, make the first switching element and second switch member
Part is switched with different frequency.
The control device makes opening for a switch element in the first switching element and the second switch element
Close frequency jitter.
The switching frequency of one switch element is higher than the switching frequency of another switch element.
The lighting device of embodiment includes the first light-emitting component, with positive electric with the first light-emitting component identical
The second light-emitting component and lamp device of pressure, it is characterised in that：The lamp device includes：Substrate；Dc source, installed in institute
State on substrate；First lighting circuit, installs on the substrate, the dc source is connected to, by first light-emitting component
Light；Second lighting circuit, installs on the substrate, is connected to the dc source, second light-emitting component is lighted；
And control device, install on the substrate, configure between first lighting circuit and second lighting circuit, it is right
First lighting circuit and second lighting circuit are controlled.First lighting circuit includes being connected to the direct current
First switching element between power supply and first light-emitting component and it is connected to the first switching element and the described first hair
The first inductor between optical element.Second lighting circuit includes being connected to the dc source and the described second luminous member
Second switch element between part and it is connected between the second switch element and second light-emitting component and has and institute
State the second inductor of the different inductance of the first inductor.The control device makes first light-emitting component and described second
In the case that light-emitting component is lighted with identical degree of dimming, make the first switching element with the second switch element with each other
Different frequency switchings.
First light-emitting component is different from the colour temperature of second light-emitting component.
The effect of utility model
According to embodiment, the influence of switching noise can be reduced.
Brief description of the drawings
Fig. 1 is the circuit block diagram of the lighting device of embodiment.
Fig. 2 (a)~Fig. 2 (b) is the circuit diagram of the lighting circuit of embodiment.
Fig. 3 is the figure of the time change of the inductor current in the lighting circuit for represent embodiment.
Fig. 4 (a)~Fig. 4 (b) is the action timing diagram of the switch element in the lighting circuit of embodiment.
Fig. 5 is the light modulation toning areal map of the lighting device of embodiment.
Fig. 6 is the block diagram of the lamp device of embodiment.
The explanation of symbol
1：First light-emitting component
2：Second light-emitting component
4：Control device
4a：First control unit (control integrated circuit)
4b：Second control unit (micro controller unit)
5：AC power
10：Lamp device
11：First lighting circuit
12：Second lighting circuit
13：Dc source
21：First inductor
22：Second inductor
31：Output capacitor
32：Diode
33：Resistance
50：Lighting device
100：Substrate
DSG1：Control signal
DSG2：Control signal
IL：Inductor current
Q1：First switching element
Q2：Second switch element
toff：During disconnection
ton：During conducting
Embodiment
Hereinafter, come to illustrate embodiment referring to the drawings.Furthermore, in the drawings, phase is appended to identical element
Same symbol.
Fig. 1 is the circuit block diagram of the lighting device 50 of embodiment.
The lighting device 50 of embodiment includes lamp device 10, the first light-emitting component 1 and the second light-emitting component 2.Light
Device 10 includes dc source 13, the first lighting circuit 11, the second lighting circuit 12 and control device 4.
The input of lamp device 10 is connected to AC power 5, is connected with the output end of lamp device 10 as load
The first light-emitting component 1 and the second light-emitting component 2.
The input of dc source 13 is connected to AC power 5.First lighting circuit 11 and the second lighting circuit 12 are connected
In shared dc source 13, receive the supply of identical direct current power from this from the dc source 13.
First lighting circuit 11 is connected to the first light-emitting component 1, and the first light-emitting component 1 is lighted.Second lighting circuit 12
The second light-emitting component 2 is connected to, the second light-emitting component 2 is lighted.
First light-emitting component 1 is for example with the structure for being combined LED and luminescent coating.Multiple LED strip connection connect
It is connected to the output end of the first lighting circuit 11.
For example by sending the LED of blue light and the combination of the luminescent coating comprising fluorophor, simulation ground obtain white or
The light of light bulb color etc., the fluorophor absorbs the blue light (exciting light) and is converted into sodium yellow, green light, red light
Deng.
Second light-emitting component 2 also has the structure for being combined LED and luminescent coating.Multiple LED strip connection connections
In the output end of the second lighting circuit 12.The LED of the LED of first light-emitting component 1 and the second light-emitting component 2 is identical LED, and
With identical forward voltage (forward voltage).The structure of the luminescent coating of first light-emitting component 1 and the second luminous member
The structure of the luminescent coating of part 2 is different, and therefore, the first light-emitting component 1 is different from the colour temperature (photochromic) of the second light-emitting component 2.
Can be (bright to adjust light output using the curent change supplied to the first light-emitting component 1 and the second light-emitting component 2
Degree).In addition, for example, the colour temperature of the first light-emitting component 1 is higher than the colour temperature of the second light-emitting component 2, the first light-emitting component 1 sends indigo plant
Relatively large number of white (W colors) light of color, the second light-emitting component 2 sends red relatively large number of light bulb color (L colors) light.Light simultaneously
First light-emitting component 1 and the second light-emitting component 2, make the ratio of the electric current supplied to the first light-emitting component 1 and the second light-emitting component 2
Change, thereby, it is possible to obtain the colour temperature between W colors and L colors.
First lighting circuit 11 and the second lighting circuit 12 be DC-to-dc converter (DC-DC converter,
Direct current-direct current converter), it is more particularly buck circuit (step-down
chopper circuit)。
Fig. 2 (a) is the circuit diagram of the first lighting circuit 11.
First switching element Q1, the first inductor 21 and output capacitor 31 series circuit are connected to dc source 13
Output end.
In the supply DC voltage V of dc source 13DCHot side and low potential side (ground connection) between, be connected in series with
The resistance 33 of diode 32, first switching element Q1 and current detecting.First switching element Q1 is for example with MOSFET
Transistor (metal-oxide-semiconductor field effect transistor, MOSFET) is constructed.
The negative electrode of diode 32 is connected to the hot side of dc source 13.The anode of diode 32 is connected to the first inductance
One end of device 21 and first switching element Q1 the first terminal.In first switching element Q1 Second terminal and dc source 13
Resistance 33 is connected between low potential side.
Output capacitor 31 is connected to the other end of the first inductor 21 and the negative electrode of diode 32, the first inductor 21,
Diode 32 and the formation closed circuit of output capacitor 31.The two ends of output capacitor 31 are the output of the first lighting circuit 11
End, the first light-emitting component 1 as load is connected with the two ends of the output capacitor 31.
Fig. 2 (b) is the circuit diagram of the second lighting circuit 12.
Second lighting circuit 12 is also to be constituted with the identical mode of the first lighting circuit 11.Second switch element Q2,
The series circuit of two inductors 22 and output capacitor 31 is connected to the output end of dc source 13.
In the supply DC voltage V of dc source 13DCHot side and low potential side (ground connection) between, be connected in series with
The resistance 33 of diode 32, second switch element Q2 and current detecting.For convenience of description, though second switch element Q2 is enclosed
The symbol different from first switching element Q1, but with first switching element Q1 identical switch elements.
The negative electrode of diode 32 is connected to the hot side of dc source 13.The anode of diode 32 is connected to the second inductance
One end of device 22 and second switch element Q2 the first terminal.In second switch element Q2 Second terminal and dc source 13
Resistance 33 is connected between low potential side.
Output capacitor 31 is connected to the other end of the second inductor 22 and the negative electrode of diode 32, the second inductor 22,
Diode 32 and the formation closed circuit of output capacitor 31.The two ends of output capacitor 31 are the output of the second lighting circuit 12
End, the second light-emitting component 2 as load is connected with the two ends of the output capacitor 31.
The first inductor 21 in the inductance and the first lighting circuit 11 of the second inductor 22 in second lighting circuit 12
Inductance it is different.
As shown in figure 1, control device 4 includes：First control unit (control integrated circuit (integrated circuit,
IC)) 4a, is controlled to the first lighting circuit 11 and the second lighting circuit 12；And the second control unit (micro controller unit
(microcontroller unit, MCU)) 4b, assign the first control unit 4a by control targe value.
As shown in Fig. 2 (a) and Fig. 2 (b), the first control unit 4a assigns control signal DSG1 first switching element Q1 grid
Extreme son, and control signal DSG2 is assigned to second switch element Q2 gate terminal.
In addition, the terminal voltage of the first inductor 21 and the terminal voltage of resistance 33 in the first lighting circuit 11 as with
Inputted in the detection signal of current feedback (current feedback) to the first control unit 4a, in the second lighting circuit 12
The terminal voltage of second inductor 22 and the terminal voltage of resistance 33 are inputted as the detection signal for current feedback to
One control unit 4a.
Fig. 3 is the inductor current I for representing to flow into the first inductor 21 and the second inductor 22L, time change
Figure.
Fig. 4 (a) is the action timing diagram of first switching element Q1 conducting disconnection, and Fig. 4 (b) is second switch element Q2
Turn on the action timing diagram disconnected.
Shown in control signal DSG1 according to transmitted by the first control unit 4a, such as Fig. 4 (a), first switching element Q1 is repeatedly
Ground is turned on disconnecting (switch).Shown in control signal DSG2 according to transmitted by the first control unit 4a, such as Fig. 4 (b), second switch
Element Q2 is repeatedly turned on disconnecting (switch).
The t during switch element Q1, switch element Q2 are turned onon, linearly increasing increase electric current flows from dc source 13
Enter to inductor 21, inductor 22, electromagnetic energy is stored in inductor 21, inductor 22.In switch element Q1, switch element Q2
T during disconnectionoff, inductor 21, inductor 22 discharge stored electromagnetic energy, and the reduction electric current of linear reduction flows into electricity
Sensor 21, inductor 22, the closed circuit of diode 32 and output capacitor 31.Repeatedly acted as described above, it is right
The output voltage V of dc source 13DCDirect voltage output obtained by being depressured is positive between the two ends of output capacitor 31
Electric current is supplied to light-emitting component 1, light-emitting component 2.
Light-emitting component 1, light-emitting component 2 are lighted with desired degree of dimming (light output).Changed according to the degree of dimming
Switch element Q1, switch element Q2 operating frequency (switching frequency).According to the switch element Q1, switch element Q2 switch
The change of frequency, lighting circuit 11, the output current of lighting circuit 12 are the forward direction electricity supplied to light-emitting component 1, light-emitting component 2
Stream corresponds to degree of dimming and changed, and light-emitting component 1, the light output (brightness) of light-emitting component 2 change.If switch element
The light output increase of Q1, switch element Q2 switching frequency reduction, then light-emitting component 1, light-emitting component 2, if switch element Q1, opening
Element Q2 switching frequency rise is closed, then light-emitting component 1, the light output of light-emitting component 2 reduce.
Dc source 13 is set in the way of being shared by the first lighting circuit 11 and the second lighting circuit 12, and first lights
The forward voltage of element 1 is identical with the forward voltage of the second light-emitting component 2.Therefore, make the first light-emitting component 1 and second luminous
In the case that element 2 is lighted with identical degree of dimming (light output), as long as making first switching element Q1 switching frequency and second
Switch element Q2 switching frequency is identical.
First control unit 4a is to inductor current ILDetected, and based on testing result come to switch element Q1, switch
Element Q2 conducting, which disconnects, to be controlled, and carries out so-called Critical Control (critical control) as shown in Figure 3.This
Place, if first switching element Q1 and second switch element Q2 switching frequency is conducting, the identical action of disconnection sequential continues,
For example when the inductor current to the first inductor 21 is detected, easily by the action generation by second switch element Q2
Noise influence.On the contrary, for example when the inductor current to the second inductor 22 is detected, easily by by first
The influence for the noise that switch element Q1 action is produced.
According to embodiment, the first control unit 4a is dimmed with the second light-emitting component 2 with identical making the first light-emitting component 1
In the case that degree (light output) is lighted, first switching element Q1 is set to be switched with second switch element Q2 with different frequency.
That is, first switching element Q1 and second switch element Q2 conducting is disconnected sequential and staggered by the first control unit 4a.
Herein, the characteristic of inductor is represented by (1) formula.L represents the inductance of inductor, ILpeakRepresent the peak of inductor current
Value, VLRepresent the terminal voltage of inductor.
LILpeak=∫ VLdt·····(1)
Moreover, t during switch element Q1, switch element Q2 conductingonInductor characteristic represented by (2) formula, switch member
T during part Q1, switch element Q2 disconnectoffInductor characteristic represented by (3) formula.VDCRepresent the direct current of dc source 13
Pressure, VLEDRepresent light-emitting component 1, the forward voltage of light-emitting component 2.
LILpeak=(VDC-VLED)×ton·····(2)
LILpeak=VLED×toff·····(3)
Switch element Q1, switch element Q2 switching frequency f are represented by (4) formula.
First lighting circuit 11 and the second lighting circuit 12 have identical VDCWith identical VLED.Therefore, the first hair is made
The light-emitting component 2 of optical element 1 and second is with identical degree of dimming (VLED) light in the case of, make the inductance of the first inductor 21 with
The inductance of second inductor 22 is different, so that first switching element Q1 and second switch element Q2 conducting disconnects sequential and staggered.
So, according to embodiment, lighted making the first light-emitting component 1 with the second light-emitting component 2 with identical degree of dimming
In the case of, by making first switching element Q1 be switched with second switch element Q2 with different frequency, first lights electricity
The action on road 11 is not easily susceptible to the influence of the noise produced by the action of the second lighting circuit 12, on the contrary, the second lighting circuit
12 action is not easily susceptible to the influence of the noise produced by the action of the first lighting circuit 11.This makes the high-precision of lighting device
Brightness adjustment control and toning control are possibly realized.
Fig. 5 is the light modulation toning areal map of the lighting device of embodiment.
Transverse direction represents photochromic (colour temperature), and more keep left side, then colour temperature is lower, more on the right side, then colour temperature is higher.Longitudinal direction table
Show degree of dimming (light output).A points represent 100% illuminating state of L colors (the second light-emitting component 2).C points represent W colors, and (first lights
Element 1) 100% illuminating state.B points represent L colors (the second light-emitting component 2) 100% illuminating state and W colors (first light
Element 1) 100% illuminating state, i.e., full light state.The line of connection A points, B points and C points represents to dim the upper limit.
In the case where making the first light-emitting component 1 and the second light-emitting component 2 be lighted with identical degree of dimming (light output), example
First switching element Q1 switching frequency is higher than second switch element Q2 switching frequency, thus, make described two switches
Element Q1, switch element Q2 switching frequency difference.
In the case where for example improving colour temperature from illuminating state as described above, reduction first switching element Q1 switch frequency
Rate, to improve the light output of the first light-emitting component 1.Thus, in the scope of W colors side, it occasionally there are first switching element Q1's
Switching frequency is identical with second switch element Q2 switching frequency, i.e. first switching element Q1 is with second switch element Q2 with identical
Sequential conducting disconnect point.
Therefore, according to embodiment, shown in such as Fig. 4 (a), shake first switching element Q1 switching frequency
(jitter).Another second switch element Q2 is switched with the fixed frequency corresponding to degree of dimming.
For example, make with the 100kHz first switching element Q1 switched switching frequency some it is specific it is interval (for example
During 1msec), fluctuated with 100kHz ± 3kHz or so switching frequency.
Or, in the situation for making the first light-emitting component 1 and the second light-emitting component 2 be lighted with identical degree of dimming (light output)
Under, can also be described to make by making second switch element Q2 switching frequency be higher than first switching element Q1 switching frequency
Two switch element Q1, switch element Q2 switching frequency differences.
In the case where for example reducing colour temperature from illuminating state as described above, reduction second switch element Q2 switch frequency
Rate, to improve the light output of the second light-emitting component 2.Thus, in the scope of L colors side, it occasionally there are first switching element Q1's
Switching frequency is identical with second switch element Q2 switching frequency, i.e. first switching element Q1 is with second switch element Q2 with identical
Sequential conducting disconnect point.
In situations as mentioned above, shake second switch element Q2 switching frequency.Another first switching element
Q1 is with corresponding to the fixed frequency of degree of dimming switch.
Only in the case where first switching element Q1 switching frequency is overlapping with second switch element Q2 switching frequency, make
One switching frequency shake.Or, in the four corner shown in Fig. 5, make a switching frequency shake.
By the control for as described above shaking a switch element, it can suppress because of first switching element Q1 and second
Switch element Q2 conducting disconnects the influence of the noise caused by Time overlap.
Fig. 6 is the block diagram of the lamp device 10 of embodiment.
Dc source 13, the first lighting circuit 11, the second lighting circuit 12, the first control unit (control IC) controls of 4a and second
Portion (MCU) 4b processed is arranged on identical substrate (printed wiring board) 100.
Dc source 13, the first lighting circuit 11, the second lighting circuit 12, the first control unit 4a and the second control unit 4b are logical
Cross the wiring pattern formed on substrate 100 and electrically connect.
The the first control unit 4a configurations being controlled to the first lighting circuit 11 and the second lighting circuit 12 are lighted first
Between the lighting circuit 12 of circuit 11 and second.
First control unit 4a is configured in the position close to both the first lighting circuit 11 and the second lighting circuit 12, so that
Can make the wiring pattern that will be connected between the first control unit 4a and the first lighting circuit 11 and by the first control unit 4a with
The contraction in length both wiring pattern that second lighting circuit 12 is connected.
So, make between the first control unit 4a and the first lighting circuit 11 and the first control unit 4a and the second lighting circuit
Wiring pattern between 12 shortens, thereby, it is possible to reduce such as inductor electricity of the first control unit 4a to the first lighting circuit 11
The influence of the noise produced by the action of the second lighting circuit 12 when stream is detected.On the contrary, the first control can be reduced by
Portion 4a acts what is produced when for example inductor current is detected to the second lighting circuit 12 by the first lighting circuit 11
The influence of noise.
Though several embodiments of the present utility model are illustrated, these embodiments are to carry as an example
The embodiment shown, it is not intended to which the scope to utility model is defined.These novel embodiments can be various with other
Mode is implemented, and various omissions can be carried out in the range of utility model objective is not departed from, replaces, change.These embodiments
Or its deformation is contained in the scope or objective of utility model, and it is contained in the utility model described in claims and its equal
Deng scope.
Claims (5)
1. a kind of lamp device, it is characterised in that including：
Substrate；
Dc source, is installed on the substrate；
First lighting circuit, installs on the substrate, is connected to the dc source, the first light-emitting component is lighted；
Second lighting circuit, installs on the substrate, is connected to the dc source, will have and first light-emitting component
Second light-emitting component of identical forward voltage is lighted；And
Control device, installs on the substrate, configures between first lighting circuit and second lighting circuit, right
First lighting circuit and second lighting circuit are controlled,
First lighting circuit includes the first switch member being connected between the dc source and first light-emitting component
Part and the first inductor being connected between the first switching element and first light-emitting component,
Second lighting circuit includes the second switch member being connected between the dc source and second light-emitting component
Part and it is connected between the second switch element and second light-emitting component and with different with first inductor
Second inductor of inductance,
The control device is in the feelings for making first light-emitting component be lighted with second light-emitting component with identical degree of dimming
Under condition, the first switching element is set to be switched with the second switch element with different frequency.
2. lamp device according to claim 1, it is characterised in that：
The control device makes the switch frequency of a switch element in the first switching element and the second switch element
Rate is shaken.
3. lamp device according to claim 2, it is characterised in that：
The switching frequency of one switch element is higher than the switching frequency of another switch element.
4. a kind of lighting device, its be include the first light-emitting component, with the first light-emitting component identical forward voltage
The second light-emitting component and lamp device lighting device, it is characterised in that：
The lamp device includes：
Substrate；
Dc source, is installed on the substrate；
First lighting circuit, installs on the substrate, is connected to the dc source, first light-emitting component is lighted；
Second lighting circuit, installs on the substrate, is connected to the dc source, second light-emitting component is lighted；
And
Control device, installs on the substrate, configures between first lighting circuit and second lighting circuit, right
First lighting circuit and second lighting circuit are controlled,
First lighting circuit includes the first switch member being connected between the dc source and first light-emitting component
Part and the first inductor being connected between the first switching element and first light-emitting component,
Second lighting circuit includes the second switch member being connected between the dc source and second light-emitting component
Part and it is connected between the second switch element and second light-emitting component and with different with first inductor
Second inductor of inductance,
The control device is in the feelings for making first light-emitting component be lighted with second light-emitting component with identical degree of dimming
Under condition, the first switching element is set to be switched with the second switch element with different frequency.
5. lighting device according to claim 4, it is characterised in that：
First light-emitting component is different from the colour temperature of second light-emitting component.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016-186868 | 2016-09-26 | ||
| JP2016186868A JP2018055787A (en) | 2016-09-26 | 2016-09-26 | Lighting device and illumination device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206498572U true CN206498572U (en) | 2017-09-15 |
Family
ID=59806201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720224833.5U Active CN206498572U (en) | 2016-09-26 | 2017-03-08 | Lamp device and lighting device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2018055787A (en) |
| CN (1) | CN206498572U (en) |
| TW (1) | TWI705733B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8334662B2 (en) * | 2009-09-11 | 2012-12-18 | Iwatt Inc. | Adaptive switch mode LED driver |
| CN201910961U (en) * | 2011-01-06 | 2011-07-27 | 英飞特电子（杭州）有限公司 | Light source adjusting device of colored light-emitting diode |
| KR101974090B1 (en) * | 2012-12-26 | 2019-04-30 | 엘지디스플레이 주식회사 | Apparatus for driving of back light and liquid crystal display device using the same |
| CN104717784B (en) * | 2013-12-13 | 2018-09-14 | 台达电子企业管理（上海）有限公司 | Light source driving circuit |
| CN104167186B (en) * | 2014-08-26 | 2017-10-24 | 深圳市华星光电技术有限公司 | LED backlight and liquid crystal display for liquid crystal display |
| TWI543665B (en) * | 2015-02-06 | 2016-07-21 | 國立成功大學 | Driving device |
-
2016
- 2016-09-26 JP JP2016186868A patent/JP2018055787A/en active Pending
-
2017
- 2017-03-08 CN CN201720224833.5U patent/CN206498572U/en active Active
- 2017-03-17 TW TW106108805A patent/TWI705733B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| TW201815228A (en) | 2018-04-16 |
| TWI705733B (en) | 2020-09-21 |
| JP2018055787A (en) | 2018-04-05 |
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