CN105810154B - LED backlight module, display device and LED backlight driving method - Google Patents
LED backlight module, display device and LED backlight driving method Download PDFInfo
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- CN105810154B CN105810154B CN201610300757.1A CN201610300757A CN105810154B CN 105810154 B CN105810154 B CN 105810154B CN 201610300757 A CN201610300757 A CN 201610300757A CN 105810154 B CN105810154 B CN 105810154B
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- led light
- light string
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- comparator
- control signal
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- 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
-
- 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
- G09G3/3413—Details of control of colour illumination sources
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
Abstract
The invention discloses a kind of LED backlight module, including：The a plurality of LED light string being arranged in parallel, wherein, the LED light string includes a plurality of first LED light string and a plurality of second LED light string；Control circuit, for sending control signal to LED light string, wherein, the control signal includes first control signal and second control signal, wherein, a plurality of first LED light string is connect via at least one first field-effect transistor with control circuit, and a plurality of second LED light string is connect via at least one second field-effect transistor with control circuit.The present invention also provides a kind of display device and LED backlight driving methods, by the way that two different LED (high colour gamut LED and low colour gamut LED) is controlled to respectively drive backlight in varied situations, power consumption is reduced, while does not influence Tcon algorithms and backlight self-characteristic.
Description
Technical field
The invention belongs to display apparatus test fields, are carried on the back more particularly, to a kind of LED backlight module, display device and LED
Optical drive method.
Background technology
Liquid crystal display device includes liquid crystal display panel and backlight module.Light source used in liquid crystal display comes from backlight mould
Group, however the utilization rate of backlight module is typically less than 10%, therefore the main power consuming portions of liquid crystal module are exactly backlight module, the back of the body
The Save power consumption of optical mode group, which just becomes liquid crystal display device, reduces an important directions of power consumption.
Technology used in traditional reduction backlight power consumption has：Optimize backlight utilization ratio (optical diaphragm optimization), CABC, DBC
Deng.These technologies have the advantages of ripe and effective, have remarkable result for bright pictures such as viewing videos.And with net
The development of network information technology, more and more people select read books and data on an electronic device, for this high contrast
And single picture some power-saving mechanisms of color just do not work.
Invention content
The purpose of the present invention is to provide a kind of LED backlight module, display device and LED backlight driving methods.
According to an aspect of the present invention, a kind of LED backlight module is provided, including：The a plurality of LED light string being arranged in parallel,
In, the LED light string includes the first LED light string and the second LED light string；Control circuit, for sending control letter to LED light string
Number, wherein, the control signal includes first control signal and second control signal, wherein, a plurality of first LED light string warp
It is connect by least one first field-effect transistor with control circuit, a plurality of second LED light string is via at least one second
Field-effect transistor is connect with control circuit.
Preferably, the first control signal is used to control lighting or extinguishing for a plurality of first LED light string；Second control
Signal processed is used to control lighting or extinguishing for a plurality of second LED light string.
Preferably, the control circuit includes：First comparator, for exporting first to a plurality of first LED light string
Control signal；Second comparator, for exporting second control signal to a plurality of second LED light string.
Preferably, the control circuit further include first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4,
First capacitance C1, voltage V1 and control terminal S, wherein, the normal phase input end of the first comparator by the 4th resistance R4 with
The control terminal S connections, inverting input are connect by 3rd resistor R3 with ground terminal, and output terminal passes through one or more first
Field-effect tube is connect with a plurality of first LED light string；The normal phase input end of second comparator by first resistor R1 with
Voltage V1 connections, inverting input are connect by the 4th resistance with the control terminal S, and output terminal passes through second one or more
Effect pipe is connect with a plurality of second LED light string；The normal phase input end of second comparator also by second resistance R2 with
The inverting input connection of the first comparator, the first capacitance C1 are connected to the inverting input of second comparator with connecing
Between ground terminal, the positive power source terminal of the first comparator and second comparator is connect with voltage V1, negative power end with
Ground terminal connects.
Preferably, the grid of the first field-effect transistor is connect with first comparator output terminal, drain electrode and multiple described the
One LED light string connects；The grid of second field-effect transistor is connect with the second comparator output terminal, drain electrode and multiple described second
LED light string connects.
Preferably, as the voltage Vs of control terminal S inputs<(V1R3)/(R1+R2+R3) when, control circuit output
First control signal controls the first LED light string to extinguish, and second control signal controls the second LED light string to light.
Preferably, when the voltage of control terminal S inputs is (V1R3)/(R1+R2+R3)<Vs<(V1·(R2+R3))/
(R1+R2+R3) when, the first control signal of control circuit output controls the first LED light string to light, second control signal control the
Two LED light strings are lighted.
Preferably, when the voltage of control terminal S inputs is Vs>During (V1 (R2+R3))/(R1+R2+R3), control electricity
The first control signal of road output controls the first LED light string to light, and second control signal controls the second LED light string to extinguish.
Preferably, the LED backlight module further includes：LED drive current adjusts circuit, including third field effect transistor
Pipe, the 5th resistance and the 6th resistance, wherein, the 5th resistance and the 6th resistance are connected in series in predetermined current source and ground terminal
Between；The grid of the third field-effect transistor is connect with control circuit, and source electrode is connect with ground terminal, drain electrode and the described 5th
Common point connection between resistance and the 6th resistance.
According to another aspect of the present invention, a kind of display device is provided, including LED backlight module described above.
According to the third aspect of the invention we, a kind of LED backlight driving method is provided, for LED backlight mould described above
Block, including：It adjusts the input voltage of control terminal S and then controls a plurality of first LED light string and a plurality of second LED light
String is lighted or is extinguished.
LED backlight module provided by the invention, display device and LED backlight driving method pass through and control two kinds of differences
LED (high colour gamut LED and low colour gamut LED) respectively drive backlight in varied situations, reduce power consumption, while do not influence Tcon calculations
Method and backlight self-characteristic.
Description of the drawings
By referring to the drawings to the description of the embodiment of the present invention, above-mentioned and other purposes of the invention, feature and
Advantage will be apparent from, in the accompanying drawings：
Fig. 1 shows the circuit diagram of LED backlight module according to embodiments of the present invention；
Fig. 2 shows the circuit diagrams of LED backlight module according to another embodiment of the present invention；
Fig. 3 shows the structure diagram of display device according to embodiments of the present invention；
Fig. 4 shows the flow chart of LED backlight driving method according to embodiments of the present invention.
Specific embodiment
Hereinafter reference will be made to the drawings is more fully described various embodiments of the present invention.In various figures, identical element
It is represented using same or similar reference numeral.For the sake of clarity, the various pieces in attached drawing are not necessarily to scale.
The present invention can be presented in a variety of manners, some of them example explained below.
Fig. 1 shows the circuit diagram of LED backlight module according to embodiments of the present invention.As shown in Figure 1, the LED
Backlight module, including：The a plurality of LED light string A1-An and B1-Bn being arranged in parallel and control circuit 10.
The LED light string includes the first LED light string A1-An and the second LED light string B1-Bn.
In the present embodiment, the first LED light string A1-An is low colour gamut LED light string, and the second LED light string B1-Bn is high colour gamut
LED light string.
Control circuit 10, for sending control signal to LED light string, wherein, the control signal, which includes the first control, to be believed
Number and second control signal.
In the present embodiment, the first control signal is used to control lighting or extinguishing for a plurality of first LED light string；It is described
Second control signal is used to control lighting or extinguishing for a plurality of second LED light string.
Wherein, a plurality of first LED light string is connect via a first field-effect transistor Q1 with control circuit, a plurality of
Second LED light string is connect via a second field-effect transistor Q2 with control circuit.
In the present embodiment, multiple first LED light string A1-An can pass through a first field-effect transistor Q1 and control
Circuit 10 connects.Multiple second LED light strings can be connect by a second field-effect transistor Q2 with control circuit 10.
Wherein, the first field-effect transistor Q1 is N-channel reinforcing MOS transistor, has cut-in voltage Ugs(th), wherein,
Ugs(th)>0.Work as Ugs>Ugs(th)When, the first field-effect transistor Q1 is in the conduction state；Work as Ugs<Ugs(th)When, the first field-effect
Transistor Q1 is in cut-off state.Second field-effect transistor Q2 is N-channel reinforcing MOS transistor, has cut-in voltage
Ugs(th), wherein, Ugs(th)>0.Work as Ugs>Ugs(th)When, the second field-effect transistor Q2 is in the conduction state；Work as Ugs<Ugs(th)When,
Second field-effect transistor Q2 is in cut-off state.
In a preferred embodiment, control circuit 10 includes first comparator U1A and the second comparator U2B, wherein,
First comparator U1A is used to export first control signal to a plurality of first LED light string；Second comparator U2B is used for more
Second LED light string described in item exports second control signal.
In another preferred embodiment, control circuit 10 further includes first resistor R1, second resistance R2,3rd resistor
R3, the 4th resistance R4, the first capacitance C1, voltage V1 and control terminal S.
Wherein, the first comparator U1A includes normal phase input end 3, inverting input 2, positive power source terminal 8, negative power end 4
With output terminal 1, wherein, normal phase input end 3 is connect by the 4th resistance R4 with the control terminal S, and inverting input 2 passes through third
Resistance R3 is connect with ground terminal, and output terminal 1 is connect by least one first field-effect tube Q1 with the first LED light string A1-An.
The second comparator U2B includes normal phase input end 5, inverting input 6, positive power source terminal 8, negative power end 4 and defeated
Outlet 7, wherein, normal phase input end 5 is connect by first resistor R1 with voltage V1, and inverting input 6 passes through the 4th resistance and institute
Control terminal S connections are stated, output terminal 7 is connect by least one second field-effect tube Q2 with the second LED light string B1-Bn.
The normal phase input end 5 of the second comparator U2B also passes through the anti-of the second resistance R2 and first comparator U1A
Phase input terminal 2 connects.
First capacitance C1 is connected between the inverting input 6 and ground terminal of the second comparator U2B.
The positive power source terminal 8 of the first comparator U1A and the second comparator U2B are connect with voltage V1, negative supply
End 4 is connect with ground terminal.
Wherein, as the voltage Vs of control terminal S inputs<(V1R3)/(R1+R2+R3) when, first comparator U1A's
The voltage of normal phase input end 3 at this time is Vs, and the voltage of inverting input 2 at this time is (V1R3)/(R1+R2+R3), then positive is defeated
The voltage for entering end 3 is less than the voltage of inverting input 2, i.e. 3 input low level of normal phase input end, inverting input 2 inputs high electricity
Flat, then output terminal 1 exports low level, at this time Ugs<Ugs(th)First field-effect transistor Q1 is in cut-off state, the first LED light string
A1-An extinguishes.And simultaneously, the voltage of the normal phase input end 5 of the U2B of the second comparator at this time is (V1 (R2+R3))/(R1+R2
+ R3), the voltage of inverting input 6 at this time is Vs, then the voltage of normal phase input end 5 is more than the voltage of inverting input 6, i.e., just
5 input high level of phase input terminal, inverting input input 6 low levels, then output terminal 7 exports high level, at this time Ugs>Ugs(th), the
Two field-effect transistor Q2 are in the conduction state, and the second LED light string B1-Bn is lighted.
As voltage (V1R3)/(R1+R2+R3) of control terminal S inputs<Vs<(V1·(R2+R3))/(R1+R2+
When R3), the voltage of the normal phase input end 3 of first comparator U1A at this time is Vs, and the voltage of inverting input 2 at this time is (V1
R3)/(R1+R2+R3), then more than the voltage of inverting input 2, i.e. normal phase input end 3 inputs high electric the voltage of normal phase input end 3
It puts down, 2 input low level of inverting input, then output terminal 1 exports high level, at this time Ugs>Ugs(th)At first field-effect transistor Q1
In conducting state, the first LED light string A1-An is lighted.And simultaneously, the voltage of the normal phase input end 5 of the U2B of the second comparator at this time
For (V1 (R2+R3))/(R1+R2+R3), the voltage of inverting input 6 at this time is Vs, then the voltage of normal phase input end 5 is more than
The voltage of inverting input 6, i.e. 5 input high level of normal phase input end, inverting input input 6 low levels, then output terminal 7 exports
High level, at this time Ugs>Ugs(th), the second field-effect transistor Q2 is in the conduction state, and the second LED light string B1-Bn is lighted.
As the voltage Vs of control terminal S inputs>During (V1 (R2+R3))/(R1+R2+R3), first comparator U1A's
The voltage of normal phase input end 3 at this time is Vs, and the voltage of inverting input 2 at this time is (V1R3)/(R1+R2+R3), then positive is defeated
The voltage for entering end 3 is more than the voltage of inverting input 2, i.e. 3 input high level of normal phase input end, inverting input 2 inputs low electricity
Flat, then output terminal 1 exports high level, at this time UGS>UGS(th)First field-effect transistor Q1 is in the conduction state, the first LED light string
A1-An is lighted.And simultaneously, the voltage of the normal phase input end 5 of the U2B of the second comparator at this time is (V1 (R2+R3))/(R1+R2
+ R3), the voltage of inverting input 6 at this time is Vs, then the voltage of normal phase input end 5 is less than the voltage of inverting input 6, i.e., just
5 input low level of phase input terminal, inverting input input 6 high level, then output terminal 7 exports low level, at this time UGS>UGS(th), the
Two field-effect transistor Q2 are in cut-off state, and the second LED light string B1-Bn extinguishes.In a preferred embodiment, first
The grid g of effect transistor Q1 is connect with the output terminal 1 of first comparator U1A, and drain electrode d is connect with the first LED light string A1-An；
The grid g of second field-effect transistor Q2 is connect with the output terminal 7 of the second comparator U2B, and drain d and the second LED light string B1-Bn
Connection.
In a preferred embodiment, wherein, the LED backlight module further includes LED drive current and adjusts circuit 20,
Including third field-effect transistor Q3, the 5th resistance R5 and the 6th resistance R6, wherein, the 5th resistance R5 and the 6th resistance R6
It is connected in series between predetermined current source and ground terminal, the grid g of the third field-effect transistor Q3 connects with control circuit 10
It connects, source electrode s is connect with ground terminal, the common point connection between the d and the 5th resistance R5 and the 6th resistance R6 that drains.
In the present embodiment, the grid g of third field-effect transistor Q3 and the second comparator U2B's of control circuit 10 is defeated
Outlet 7 connects.
LED backlight module provided by the invention, by the way that two different LED (high colour gamut LED and low colour gamut LED) is controlled to exist
Backlight is respectively driven under different situations, reduces power consumption, while do not influence Tcon algorithms and backlight self-characteristic.
Further, since the electric current of low colour gamut LED light string and high colour gamut LED light string needed under same brightness is different, low color
Electric current needed for the LED light string of domain is small, and electric current needed for high colour gamut LED light string is big, and the present invention also coordinates simultaneously when switching LED light string
The feedback current of LED driver is had switched, user is made not feel apparent bright dark variation when word class browses.
Fig. 2 shows the circuit diagrams of LED backlight module according to another embodiment of the present invention.As shown in Fig. 2,
The LED backlight module, including：The a plurality of LED light string A1-An and B1-Bn being arranged in parallel and control circuit 10.
The LED light string includes the first LED light string A1-An and the second LED light string B1-Bn.
In the present embodiment, the first LED light string A1-An is low colour gamut LED light string, and the second LED light string B1-Bn is high colour gamut
LED light string.
Control circuit 10, for sending control signal to LED light string, wherein, the control signal, which includes the first control, to be believed
Number and second control signal.
In the present embodiment, the first control signal is used to control lighting or extinguishing for a plurality of first LED light string；It is described
Second control signal is used to control lighting or extinguishing for a plurality of second LED light string.
Wherein, a plurality of first LED light string is connect via a first field-effect transistor Q1 with control circuit, a plurality of
Second LED light string is connect via a second field-effect transistor Q2 with control circuit.
In the present embodiment, multiple first LED light string A1-An can pass through k the first field-effect transistor Q1 and control
Circuit 10 connects, and multiple second LED light string B1-Bn can pass through k the second field-effect transistor Q2 and be connect with control circuit 10.
Wherein, 2≤k≤n.
In a preferred embodiment, multiple first LED light string A1-An can pass through n the first field-effect transistors
Q1 is connect with control circuit 10, and multiple second LED light string B1-Bn can pass through n the second field-effect transistor Q2 and control electricity
Road 10 connects.
Wherein, the first field-effect transistor Q1 is N-channel reinforcing MOS transistor, has cut-in voltage Ugs(th), wherein,
Ugs(th)>0.Work as Ugs>Ugs(th)When, the first field-effect transistor Q1 is in the conduction state；Work as Ugs<Ugs(th)When, the first field-effect
Transistor Q1 is in cut-off state.Second field-effect transistor Q2 is N-channel reinforcing MOS transistor, has cut-in voltage
Ugs(th), wherein, Ugs(th)>0.Work as Ugs>Ugs(th)When, the second field-effect transistor Q2 is in the conduction state；Work as Ugs<Ugs(th)When,
Second field-effect transistor Q2 is in cut-off state.
In a preferred embodiment, control circuit 10 includes first comparator U1A and the second comparator U2B, wherein,
First comparator U1A is used to export first control signal to a plurality of first LED light string；Second comparator U2B is used for more
Second LED light string described in item exports second control signal.
In another preferred embodiment, control circuit 10 further includes first resistor R1, second resistance R2,3rd resistor
R3, the 4th resistance R4, the first capacitance C1, voltage V1 and control terminal S.
Wherein, the first comparator U1A includes normal phase input end 3, inverting input 2, positive power source terminal 8, negative power end 4
With output terminal 1, wherein, normal phase input end 3 is connect by the 4th resistance R4 with the control terminal S, and inverting input 2 passes through third
Resistance R3 is connect with ground terminal, and output terminal 1 is connect by least one first field-effect tube Q1 with the first LED light string A1-An.
The second comparator U2B includes normal phase input end 5, inverting input 6, positive power source terminal 8, negative power end 4 and defeated
Outlet 7, wherein, normal phase input end 5 is connect by first resistor R1 with voltage V1, and inverting input 6 passes through the 4th resistance and institute
Control terminal S connections are stated, output terminal 7 is connect by least one second field-effect tube Q2 with the second LED light string B1-Bn.
The normal phase input end 5 of the second comparator U2B also passes through the anti-of the second resistance R2 and first comparator U1A
Phase input terminal 2 connects.
First capacitance C1 is connected between the inverting input 6 and ground terminal of the second comparator U2B.
The positive power source terminal 8 of the first comparator U1A and the second comparator U2B are connect with voltage V1, negative supply
End 4 is connect with ground terminal.
Wherein, as the voltage Vs of control terminal S inputs<(V1R3)/(R1+R2+R3) when, first comparator U1A's
The voltage of normal phase input end 3 at this time is Vs, and the voltage of inverting input 2 at this time is (V1R3)/(R1+R2+R3), then positive is defeated
The voltage for entering end 3 is less than the voltage of inverting input 2, i.e. 3 input low level of normal phase input end, inverting input 2 inputs high electricity
Flat, then output terminal 1 exports low level, at this time Ugs<Ugs(th)First field-effect transistor Q1 is in cut-off state, the first LED light string
A1-An extinguishes.And simultaneously, the voltage of the normal phase input end 5 of the U2B of the second comparator at this time is (V1 (R2+R3))/(R1+R2
+ R3), the voltage of inverting input 6 at this time is Vs, then the voltage of normal phase input end 5 is more than the voltage of inverting input 6, i.e., just
5 input high level of phase input terminal, inverting input input 6 low levels, then output terminal 7 exports high level, at this time Ugs>Ugs(th), the
Two field-effect transistor Q2 are in the conduction state, and the second LED light string B1-Bn is lighted.
As voltage (V1R3)/(R1+R2+R3) of control terminal S inputs<Vs<(V1·(R2+R3))/(R1+R2+
When R3), the voltage of the normal phase input end 3 of first comparator U1A at this time is Vs, and the voltage of inverting input 2 at this time is (V1
R3)/(R1+R2+R3), then more than the voltage of inverting input 2, i.e. normal phase input end 3 inputs high electric the voltage of normal phase input end 3
It puts down, 2 input low level of inverting input, then output terminal 1 exports high level, at this time Ugs>Ugs(th)At first field-effect transistor Q1
In conducting state, the first LED light string A1-An is lighted.And simultaneously, the voltage of the normal phase input end 5 of the U2B of the second comparator at this time
For (V1 (R2+R3))/(R1+R2+R3), the voltage of inverting input 6 at this time is Vs, then the voltage of normal phase input end 5 is more than
The voltage of inverting input 6, i.e. 5 input high level of normal phase input end, inverting input input 6 low levels, then output terminal 7 exports
High level, at this time Ugs>Ugs(th), the second field-effect transistor Q2 is in the conduction state, and the second LED light string B1-Bn is lighted.
As the voltage Vs of control terminal S inputs>During (V1 (R2+R3))/(R1+R2+R3), first comparator U1A's
The voltage of normal phase input end 3 at this time is Vs, and the voltage of inverting input 2 at this time is (V1R3)/(R1+R2+R3), then positive is defeated
The voltage for entering end 3 is more than the voltage of inverting input 2, i.e. 3 input high level of normal phase input end, inverting input 2 inputs low electricity
Flat, then output terminal 1 exports high level, at this time UGS>UGS(th)First field-effect transistor Q1 is in the conduction state, the first LED light string
A1-An is lighted.And simultaneously, the voltage of the normal phase input end 5 of the U2B of the second comparator at this time is (V1 (R2+R3))/(R1+R2
+ R3), the voltage of inverting input 6 at this time is Vs, then the voltage of normal phase input end 5 is less than the voltage of inverting input 6, i.e., just
5 input low level of phase input terminal, inverting input input 6 high level, then output terminal 7 exports low level, at this time UGS>UGS(th), the
Two field-effect transistor Q2 are in cut-off state, and the second LED light string B1-Bn extinguishes.
In a preferred embodiment, the output terminal of the grid g and first comparator U1A of the first field-effect transistor Q1
1 connection, drain electrode d are connect with the first LED light string A1-An；The grid g's of second field-effect transistor Q2 and the second comparator U2B
Output terminal 7 connects, and drain electrode d is connect with the second LED light string B1-Bn.
In a preferred embodiment, wherein, the LED backlight module further includes LED drive current and adjusts circuit 20,
Including third field-effect transistor Q3, the 5th resistance R5 and the 6th resistance R6, wherein, the 5th resistance R5 and the 6th resistance R6
It is connected in series between predetermined current source and ground terminal, the grid g of the third field-effect transistor Q3 connects with control circuit 10
It connects, source electrode s is connect with ground terminal, the common point connection between the d and the 5th resistance R5 and the 6th resistance R6 that drains.
In the present embodiment, the grid g of third field-effect transistor Q3 and the second comparator U2B's of control circuit 10 is defeated
Outlet 7 connects.
Fig. 3 shows the structure diagram of display device according to embodiments of the present invention, including driving chip 30 and above-mentioned
The LED backlight module.
Wherein, the driving chip 30 is used for the first field-effect transistor Q1 of the LED backlight module and second
Effect transistor Q2 provides voltage.
In the present embodiment, the source electrode s of the first field-effect transistor Q1 of the LED backlight module connects with driving chip 30
It connects, the source electrode s of the second field-effect transistor Q2 is connect with driving chip 30.
Fig. 4 shows the flow chart of LED backlight driving method according to embodiments of the present invention.As shown in figure 4, the present invention is real
The driving method of example is applied for driving LED backlight module as shown in Figure 1 or 2, the method includes：
Step S410, the input voltage of adjustment control terminal S and then a plurality of first LED light string and a plurality of described is controlled
Second LED light string is lighted or is extinguished.
The input voltage of control terminal S is adjusted in different situations as a result, so that two different LED are (high
Colour gamut LED and low colour gamut LED) backlight is respectively driven, power consumption is reduced, while do not influence Tcon algorithms and backlight self-characteristic.
According to the embodiment of the present invention as described above, these embodiments are there is no all details of detailed descriptionthe, also not
It is only the specific embodiment to limit the invention.Obviously, as described above, can make many modifications and variations.This explanation
Book is chosen and specifically describes these embodiments, is in order to preferably explain the principle of the present invention and practical application, belonging to making
Technical field technical staff can be used using modification of the invention and on the basis of the present invention well.The protection model of the present invention
The range that the claims in the present invention are defined should be subject to by enclosing.
Claims (9)
1. a kind of LED backlight module, including：
The a plurality of LED light string being arranged in parallel, wherein, the LED light string includes a plurality of first LED light string and a plurality of second LED light
String；
Control circuit, for sending control signal to the LED light string, wherein, the control signal includes first control signal
And second control signal,
Wherein, a plurality of first LED light string is connect via at least one first field-effect transistor with control circuit, described more
The second LED light string of item is connect via at least one second field-effect transistor with control circuit；
It further includes LED drive current and adjusts circuit, the LED drive current adjusts circuit and includes third field-effect transistor, the
Five resistance and the 6th resistance, wherein, the 5th resistance and the 6th resistance are connected in series between predetermined current source and ground terminal；
The grid of the third field-effect transistor is connect with control circuit, and source electrode is connect with ground terminal, drain electrode and the described 5th
Common point connection between resistance and the 6th resistance.
2. LED backlight module according to claim 1, wherein, first LED light string is low colour gamut LED light string, described
Second LED light string is high colour gamut LED light string.
3. LED backlight module according to claim 1, wherein, the first control signal is used to control a plurality of first LED
Lamp string is lighted or is extinguished；The second control signal is used to control lighting or extinguishing for a plurality of first LED light string.
4. LED backlight module according to claim 3, wherein, the control circuit includes：
First comparator, for exporting first control signal to a plurality of first LED light string；
Second comparator, for exporting second control signal to a plurality of second LED light string.
5. LED backlight module according to claim 4, wherein, the control circuit further includes first resistor R1, the second electricity
R2,3rd resistor R3, the 4th resistance R4, the first capacitance C1, voltage V1 and control terminal S are hindered,
Wherein, the normal phase input end of the first comparator is connect by the 4th resistance R4 with the control terminal S, inverting input
It is connect by 3rd resistor R3 with ground terminal, output terminal passes through one or more first field-effect tube and a plurality of first LED
Lamp string connects；
The normal phase input end of second comparator is connect by first resistor R1 with voltage V1, and inverting input passes through the 4th electricity
Resistance is connect with the control terminal S, and output terminal is contacted by one or more second field-effect tube and a plurality of second LED light
It connects；
The normal phase input end of second comparator is also connected by second resistance R2 and the inverting input of the first comparator
It connects,
First capacitance C1 is connected between the inverting input and ground terminal of second comparator,
The positive power source terminal of the first comparator and second comparator is connect with voltage V1, and negative power end is and ground terminal
Connection.
6. LED backlight module according to claim 5, wherein, the grid and first comparator of the first field-effect transistor
Output terminal connects, and drain electrode is connect with multiple first LED light strings；The grid of second field-effect transistor and the second comparator are defeated
Outlet connects, and drain electrode is connect with multiple second LED light strings.
7. LED backlight module according to claim 6, wherein, as the voltage Vs of control terminal S inputs<(V1·R3)/
(R1+R2+R3) when, the first control signal of control circuit output controls the first LED light string to extinguish, second control signal control the
Two LED light strings are lighted；
When the voltage of control terminal S inputs is (V1R3)/(R1+R2+R3)<Vs<(V1·(R2+R3))/(R1+R2+R3)
When, the first control signal of control circuit output controls the first LED light string to light, and second control signal controls the second LED light string
It lights；
When the voltage of control terminal S inputs is Vs>During (V1 (R2+R3))/(R1+R2+R3), the first of control circuit output
Control signal controls the first LED light string to light, and second control signal controls the second LED light string to extinguish.
8. a kind of display device, including the LED backlight module as described in any one of claim 1-7.
9. a kind of LED backlight driving method, for the LED backlight module as described in any one of claim 1-7, including：
It adjusts the input voltage of control terminal S and then controls a plurality of first LED light string and a plurality of second LED light string
It lights or extinguishes.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610300757.1A CN105810154B (en) | 2016-05-09 | 2016-05-09 | LED backlight module, display device and LED backlight driving method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610300757.1A CN105810154B (en) | 2016-05-09 | 2016-05-09 | LED backlight module, display device and LED backlight driving method |
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| Publication Number | Publication Date |
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| CN105810154A CN105810154A (en) | 2016-07-27 |
| CN105810154B true CN105810154B (en) | 2018-06-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110136655A (en) * | 2019-04-08 | 2019-08-16 | 昆山龙腾光电有限公司 | Backlight driving system and display device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107633821B (en) * | 2017-09-22 | 2019-11-08 | 北京小米移动软件有限公司 | Screen backlight lamp mould group, display screen module and terminal |
| CN109272946B (en) * | 2018-11-16 | 2020-06-05 | 昆山龙腾光电股份有限公司 | Backlight source control circuit and liquid crystal display device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3957150B2 (en) * | 2001-02-08 | 2007-08-15 | セイコーインスツル株式会社 | LED drive circuit |
| TW200737070A (en) * | 2006-02-23 | 2007-10-01 | Powerdsine Ltd | Voltage controlled backlight driver |
| KR100897819B1 (en) * | 2007-06-21 | 2009-05-18 | 주식회사 동부하이텍 | Circuit for driving Light Emitted Diode |
| JP2010212369A (en) * | 2009-03-09 | 2010-09-24 | Tdk-Lambda Corp | Led driving device |
| WO2012020615A1 (en) * | 2010-08-09 | 2012-02-16 | シャープ株式会社 | Light emitting device, display device and drive method of light emitting device |
| CN102740567B (en) * | 2012-07-04 | 2014-10-29 | 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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2016
- 2016-05-09 CN CN201610300757.1A patent/CN105810154B/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110136655A (en) * | 2019-04-08 | 2019-08-16 | 昆山龙腾光电有限公司 | Backlight driving system and display device |
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Address after: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee after: Kunshan Longteng Au Optronics Co Address before: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee before: Kunshan Longteng Optronics Co., Ltd. |