CN107909969A - Drive circuit, backlight and display device - Google Patents
Drive circuit, backlight and display device Download PDFInfo
- Publication number
- CN107909969A CN107909969A CN201610887390.8A CN201610887390A CN107909969A CN 107909969 A CN107909969 A CN 107909969A CN 201610887390 A CN201610887390 A CN 201610887390A CN 107909969 A CN107909969 A CN 107909969A
- Authority
- CN
- China
- Prior art keywords
- led light
- power supply
- output terminal
- drive circuit
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
-
- 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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The present invention provides a kind of drive circuit, the drive circuit is used to drive LED light string, wherein, the drive circuit includes at least one power supply unit, each power supply unit includes power supply module, constant-current control module and separated by direct communication capacitance, the power supply module is capable of the voltage signal of exporting change, one end of the separated by direct communication capacitance is connected with the output terminal of the power supply module, the other end of the separated by direct communication capacitance is connected with the first output terminal of said supply unit, one end of the constant-current control module is connected with the output terminal of the power supply module, the other end of the constant-current control module is connected with the second output terminal of said supply unit.The present invention also provides a kind of backlight and a kind of display device.Only increase separated by direct communication capacitance two LED light strings of driving can be achieved and shine, the brightness for improving the backlight for including drive circuit while simplifies the structure of drive circuit.
Description
Technical field
The present invention relates to field of display devices, and in particular, to a kind of drive circuit, a kind of back of the body including the drive circuit
Light source and a kind of display device including the backlight.
Background technology
The backlight of display device includes drive circuit and LED light string.Drive circuit includes power supply module and perseverance
Flow control module, power supply module is used for the electric signal for receiving rectifier power source offer, and the electric signal is delivered to current constant control mould
Block, the voltage to be shone by constant-current control module conversion layer driving LED light string., can be with order to improve the brightness of backlight
Multiple LED light strings are set in the backlight, and each LED light string corresponds to a drive circuit, such as Fig. 1 institutes
Show.
The quantity of control circuit is added while increasing LED light string, so that back light source structure is more multiple
Miscellaneous, cost also increases.
Therefore, such as how simple structure improves the brightness of backlight as this area technical problem urgently to be resolved hurrily.
The content of the invention
It is an object of the invention to provide a kind of drive circuit, a kind of backlight and one kind including the drive circuit to include
The display device of the backlight.The driving circuit structure is simple, and multiple LED light strings can be driven to shine.
To achieve these goals, as one aspect of the present invention, there is provided a kind of drive circuit, the drive circuit are used
In driving LED light string, wherein, the drive circuit includes at least one power supply unit, and each power supply unit includes supplying
Electric module, constant-current control module and separated by direct communication capacitance, the power supply module are capable of the voltage signal of exporting change, the blocking
One end that logical alternating current holds is connected with the output terminal of the power supply module, and the other end of the separated by direct communication capacitance and the power supply are single
First output terminal of member is connected, and one end of the constant-current control module is connected with the output terminal of the power supply module, the constant current
The other end of control module is connected with the second output terminal of said supply unit.
Preferably, the voltage signal of the power supply module output is square-wave signal.
Preferably, the frequency of the power supply module is 200kHz, and the capacity of the separated by direct communication capacitance is not less than 0.47 μ F.
As another aspect of the present invention, there is provided a kind of backlight, the backlight include drive circuit and multigroup hair
Optical diode lamp string, wherein, every group of LED light string includes the first LED light string and the second LED light lamp
String, the drive circuit is above-mentioned drive circuit provided by the present invention, and each power supply unit corresponds to one group of LED light lamp
String, the cathode of first LED light string are connected with the first output terminal of said supply unit, anode and the power supply
Second output terminal of unit is connected, the cathode of second LED light string and the second output terminal phase of said supply unit
Even, anode is connected with the second output terminal of said supply unit.
Preferably, the backlight includes at least one rectification module, each rectification module include the first rectifier diode,
Second rectifier diode, the first storage capacitance and the second storage capacitance, and every group of LED light string corresponds to a rectification mould
Block, the cathode of first rectifier diode are connected with first output terminal, the anode of first rectifier diode and institute
The cathode for stating the first LED light string is connected, the cathode of second rectifier diode and second LED light lamp
The anode of string is connected, and the anode of second rectifier diode is connected with first output terminal, first storage capacitance with
First LED light string is in parallel, and second storage capacitance is in parallel with second LED light string.
Preferably, the backlight includes at least one current sampling module, and each said supply unit corresponds to an institute
State current sampling module, the current sampling module is connected on the anode of first LED light string and described second defeated
Between outlet, and the output terminal of the current sampling module is connected with the other end of the constant-current control module.
Still another aspect as the present invention, there is provided a kind of display device, the display device include backlight, wherein,
The backlight is above-mentioned backlight provided by the present invention.
Power supply module is capable of the voltage signal of exporting change.Therefore, during power supply module output cathode voltage,
Separated by direct communication capacitance storing electricity.At this time, under the action of constant-current control module, the first LED light string can be driven to send out
Light.When the polarity of the voltage of power supply module output changes, separated by direct communication capacitance starts to discharge.In constant-current control module
Under effect, the second LED light string can be driven to shine.
Shine, carry it follows that only increasing a separated by direct communication capacitance and two LED light strings of driving can be achieved
Height includes simplifying the structure of drive circuit while the brightness of the backlight of the drive circuit.
Brief description of the drawings
Attached drawing is for providing a further understanding of the present invention, and a part for constitution instruction, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is the circuit diagram of existing backlight；
Fig. 2 is the circuit diagram of backlight provided by the present invention；
Fig. 3 (a) and Fig. 3 (b) is the waveform for the voltage signal that power supply module provides in backlight provided by the present invention
Figure；
Fig. 3 (c) be to separated by direct communication capacitance charge when, the voltage change figure of the first storage capacitance and the second storage capacitance.
Description of reference numerals
100：Power supply module 200：Constant-current control module
310：First LED light string 320：Second LED light string
400：Current sampling module 500：Rectification module
Embodiment
The embodiment of the present invention is described in detail below in conjunction with attached drawing.It should be appreciated that this place is retouched
The embodiment stated is merely to illustrate and explain the present invention, and is not intended to limit the invention.
As one aspect of the present invention, there is provided a kind of drive circuit, the drive circuit are used to drive light emitting diode
Lamp string, wherein, as shown in Fig. 2, the drive circuit includes at least one power supply unit, each power supply unit includes power supply module
100th, constant-current control module 200 and separated by direct communication capacitance C0.Power supply module 100 is capable of the voltage signal of exporting change, and blocking is led to
Alternating current holds C0One end be connected with the output terminal of power supply module 100, separated by direct communication capacitance C0The other end and said supply unit
First output terminal is connected, and one end of constant-current control module 200 is connected with the output terminal of power supply module 100, constant-current control module 200
The other end be connected with the second output terminal of said supply unit.
Any one power supply unit can drive two LED light strings.Shown specific embodiment party in fig. 2
In formula, power supply unit drives the first LED light string 310 and the second LED light string 320 to shine.Specific connection side
Formula is as shown in the figure, the cathode of the first LED light string 310 is connected (equivalent to defeated with the first output terminal of said supply unit
Outlet cathode), the anode of the first LED light string 310 and the second output terminal of said supply unit are (equivalent to output terminal
Anode) it is connected.The cathode of second LED light string 320 is connected with the second output terminal of said supply unit, and second shines
The anode of diode lamp luster 320 is connected with the first output terminal of said supply unit.
Power supply module 100 is capable of the voltage signal of exporting change.Therefore, in 100 output cathode voltage of power supply module
During, separated by direct communication capacitance C0Storing electricity.At this time, under the action of constant-current control module 200, first can be driven to shine
Diode lamp luster 310 shines.When the polarity for the voltage that power supply module 100 exports changes, separated by direct communication capacitance C0Start
Electric discharge.Under the action of constant-current control module 200, the second LED light string 320 can be driven to shine.
It follows that only increase a separated by direct communication capacitance C0Two LED light strings of driving can be achieved to shine,
The structure of drive circuit is simplified while the brightness for improving the backlight for including the drive circuit.
In the present invention, do not have special requirement to the quantity of power supply unit in drive circuit, in fig. 2 shown reality
Apply in mode, drive circuit includes a power supply unit.
In the present invention, the waveform of the voltage signal exported to drive circuit is also without special limitation.In order to enable the
320 stabilized illumination of one LED light string 310 and the second LED light string, it is preferable that such as Fig. 3 (a) and Fig. 3 (b)
Shown, the voltage signal that power supply module 100 exports is square-wave signal.
In the present invention, to the frequency of power supply module also without special limitation.In general, the frequency of power supply module 100 is
200kHz.When being including 40 rated current respectively in the first LED light string 310 and second LED light string 320
During the light emitting diode of 120mA, separated by direct communication capacitance C0Capacity not less than 0.47 μ F can meet drive the first light-emitting diodes
Spot string 310 and second LED light string 320 shine.In this case, separated by direct communication capacitance C0Can be with film
The form of capacitance is realized, further simplify the structure of drive circuit.
As another aspect of the present invention, there is provided a kind of backlight, the backlight include drive circuit and multi-group light-emitting
Diode lamp luster, wherein, as shown in Fig. 2, every group of LED light string includes the first LED light string 310 and the second hair
Optical diode lamp string 320, the drive circuit are above-mentioned drive circuit provided by the present invention, and each power supply unit corresponds to one group
LED light string, the cathode of the first LED light string 310 are connected with the first output terminal of said supply unit, anode
It is connected with the second output terminal of said supply unit, the cathode of the second LED light string 320 and the of said supply unit
Two output terminals are connected, and anode is connected with the second output terminal of said supply unit.
As mentioned above it is possible, power supply module 100 is capable of the voltage signal of exporting change.Therefore, exported in power supply module 100
During positive polarity voltage, separated by direct communication capacitance C0Storing electricity.At this time, can be with the action of constant-current control module 200
The first LED light string 310 is driven to shine.When the polarity for the voltage that power supply module 100 exports changes, blocking is led to
Alternating current holds C0Start to discharge.Under the action of constant-current control module 200, the second LED light string 320 can be driven to shine.
Preferably, the backlight includes at least one rectification module 500, and each rectification module 500 includes the first rectification
Diode D1, the second rectifier diode D2, the first storage capacitance C1 and the second storage capacitance C2, and every group of LED light string
A corresponding rectification module 500.The cathode of first rectifier diode D1 is connected with the first output terminal of said supply unit, and first
The anode of rectifier diode D1 is connected with the cathode of the first LED light string 310, the cathode of the second rectifier diode D2 with
The anode of second LED light string 310 is connected, the anode of the second rectifier diode D2 and the first of said supply unit defeated
Outlet is connected, and the first storage capacitance C1 is in parallel with the first LED light string 310, the second storage capacitance C2 and second luminous two
Pole pipe lamp string 320 is in parallel.
The operation principle of the backlight provided in Fig. 2 is introduced with reference to Fig. 3 (a).
100 output high level voltage signal V of power supply module0When, to separated by direct communication capacitance C0Charging, the first rectifier diode
D1 is turned on, and the first LED light string 310 shines, while the first storage capacitance C1Store electric energy.When power supply module 100 exports
Low level voltage signal V1When, the first storage capacitance C1Electric discharge, maintains the first LED light string 310 to shine.Meanwhile blocking
Logical alternating current holds C0Electric discharge, the second LED light string 320 of driving shines, while the second storage capacitance C2Store electric energy.Class successively
Push away, when the first LED light string 310 shines, the second storage capacitance C2Electric discharge, maintains the second LED light string 320 to send out
Light.
In Fig. 3 (c), shown in Va is to separated by direct communication capacitance C0During charging, the first storage capacitance C1The voltage at both ends becomes
Change, shown in Vb is to separated by direct communication capacitance C0During charging, the second storage capacitance C2The voltage change at both ends.
Constant-current control module 200 is a DC boosting chip, in order to enable constant-current control module 200 works normally, it is excellent
Selection of land, the backlight include at least one current sampling module 400, and each said supply unit corresponds to a current sampling mould
Block 400, current sampling module 400 are connected on the anode of the first LED light string 310 and the second output terminal of power supply unit
Between, and the output terminal of current sampling module 400 is connected with the other end of constant-current control module 200.
Still another aspect as the present invention, there is provided a kind of display device, the display device include backlight, wherein,
The backlight is above-mentioned backlight provided by the present invention.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary implementation that uses
Mode, but the present invention is not limited thereto.For those skilled in the art, the essence of the present invention is not being departed from
In the case of refreshing and essence, various changes and modifications can be made therein, these variations and modifications are also considered as protection scope of the present invention.
Claims (7)
1. a kind of drive circuit, the drive circuit is used to drive LED light string, it is characterised in that the drive circuit
Including at least one power supply unit, each power supply unit includes power supply module, constant-current control module and separated by direct communication capacitance, described
Power supply module is capable of the voltage signal of exporting change, one end of the separated by direct communication capacitance and the output terminal phase of the power supply module
Even, the other end of the separated by direct communication capacitance is connected with the first output terminal of said supply unit, the constant-current control module
One end is connected with the output terminal of the power supply module, the other end of the constant-current control module and the second of said supply unit defeated
Outlet is connected.
2. drive circuit according to claim 1, it is characterised in that the voltage signal of the power supply module output is square wave
Signal.
3. drive circuit according to claim 2, it is characterised in that the frequency of the power supply module is 200kHz, described
The capacity of separated by direct communication capacitance is not less than 0.47 μ F.
4. a kind of backlight, the backlight includes drive circuit and multi-group light-emitting diode lamp string, it is characterised in that every group of hair
Optical diode lamp string includes the first LED light string and the second LED light string, and the drive circuit is claim
Drive circuit in 1 to 3 described in any one, each power supply unit correspond to one group of LED light string, and described first shines
The cathode of diode lamp luster is connected with the first output terminal of said supply unit, the second output terminal of anode and said supply unit
It is connected, the cathode of second LED light string is connected with the second output terminal of said supply unit, anode and the confession
Second output terminal of electric unit is connected.
5. backlight according to claim 4, it is characterised in that the backlight includes at least one rectification module, often
A rectification module includes the first rectifier diode, the second rectifier diode, the first storage capacitance and the second storage capacitance, and every group
LED light string corresponds to a rectification module, and the cathode of first rectifier diode is connected with first output terminal,
The anode of first rectifier diode is connected with the cathode of first LED light string, second rectifier diode
Cathode be connected with the anode of second LED light string, the anode of second rectifier diode and described first defeated
Outlet is connected, and first storage capacitance is in parallel with first LED light string, second storage capacitance with it is described
Second LED light string is in parallel.
6. backlight according to claim 4 or 5, it is characterised in that the backlight includes at least one current sampling
Module, each said supply unit correspond to a current sampling module, and the current sampling module is connected on described first
Between the anode of LED light string and second output terminal, and the output terminal of the current sampling module and the constant current
The other end of control module is connected.
7. a kind of display device, the display device includes backlight, it is characterised in that the backlight is claim 4 to 6
Backlight described in middle any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610887390.8A CN107909969A (en) | 2016-10-11 | 2016-10-11 | Drive circuit, backlight and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610887390.8A CN107909969A (en) | 2016-10-11 | 2016-10-11 | Drive circuit, backlight and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107909969A true CN107909969A (en) | 2018-04-13 |
Family
ID=61839939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610887390.8A Pending CN107909969A (en) | 2016-10-11 | 2016-10-11 | Drive circuit, backlight and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107909969A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112233610A (en) * | 2020-10-16 | 2021-01-15 | Tcl华星光电技术有限公司 | Backlight constant-current control circuit and backlight structure |
| CN112785971A (en) * | 2020-03-18 | 2021-05-11 | 海信视像科技股份有限公司 | Display device and negative-pressure step power supply circuit |
| US11783788B2 (en) | 2020-03-18 | 2023-10-10 | Hisense Visual Technology Co., Ltd. | Display apparatus and display control method |
| US11825577B2 (en) | 2020-08-24 | 2023-11-21 | Hisense Visual Technology Co., Ltd. | Display apparatus and step power circuit |
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| CN200997703Y (en) * | 2007-01-12 | 2007-12-26 | 陈锦照 | Improved LED decorative light string structure |
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| CN102682719A (en) * | 2012-05-16 | 2012-09-19 | 深圳市华星光电技术有限公司 | LED (Light Emitting Diode) backlight driving circuit, backlight module and liquid crystal display device |
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| CN105682294A (en) * | 2016-03-10 | 2016-06-15 | 深圳市通普科技有限公司 | Led driving power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200997703Y (en) * | 2007-01-12 | 2007-12-26 | 陈锦照 | Improved LED decorative light string structure |
| CN201750606U (en) * | 2010-09-08 | 2011-02-16 | 马丽娟 | Barrierless LED (light-emitting diode) driving circuit |
| CN102281688A (en) * | 2011-09-20 | 2011-12-14 | 马丽娟 | Drive circuit for light emitting diode |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112785971A (en) * | 2020-03-18 | 2021-05-11 | 海信视像科技股份有限公司 | Display device and negative-pressure step power supply circuit |
| CN112785971B (en) * | 2020-03-18 | 2022-03-18 | 海信视像科技股份有限公司 | Display device and negative-pressure step power supply circuit |
| US11783788B2 (en) | 2020-03-18 | 2023-10-10 | Hisense Visual Technology Co., Ltd. | Display apparatus and display control method |
| US11825577B2 (en) | 2020-08-24 | 2023-11-21 | Hisense Visual Technology Co., Ltd. | Display apparatus and step power circuit |
| CN112233610A (en) * | 2020-10-16 | 2021-01-15 | Tcl华星光电技术有限公司 | Backlight constant-current control circuit and backlight structure |
| WO2022077719A1 (en) * | 2020-10-16 | 2022-04-21 | Tcl华星光电技术有限公司 | Backlight constant-current control circuit and backlight structure |
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Application publication date: 20180413 |