CN205751478U - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN205751478U CN205751478U CN201620556937.1U CN201620556937U CN205751478U CN 205751478 U CN205751478 U CN 205751478U CN 201620556937 U CN201620556937 U CN 201620556937U CN 205751478 U CN205751478 U CN 205751478U
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Abstract
The utility model discloses a kind of backlight module and display device, relate to technical field of electronic equipment, main purpose is that the temperature of the capacitor of the outfan avoiding driver raises, to extend the service life of capacitor.Main technical schemes of the present utility model is: this backlight module includes light emitting diode matrix, and it includes multiple light emitting diode string；Multiple switches, its quantity is identical with the quantity of light emitting diode string, and the outfan of each switch is connected with the negative pole of each light emitting diode string；Control unit, it includes multiple first signal output part, and it is identical that multiple first signal output parts can send dutycycle, and has multiple pulse-width signals of preset phase difference, to control opening or closing of multiple switch；Backlight driver, is connected with the positive pole of control unit and multiple light emitting diode string, for providing electric energy for control unit and light emitting diode matrix.This utility model is mainly used in providing backlight for liquid crystal display.
Description
Technical field
This utility model relates to technical field of electronic equipment, particularly relates to a kind of backlight module and display device.
Background technology
Liquid crystal display has high brightness, high-contrast and high colour saturation, be widely used in from small handsets to
On the various electronic equipments of large-scale tv and facility.
Backlight module is as the important component part of liquid crystal display, and it includes light emitting diode matrix and sends out for driving
The driver of light diode array, generally the outfan in driver can connect capacitor, so that capacitor can play surely
Determine voltage and the effect of transient energy is provided for light emitting diode matrix.In prior art, driver is to light emitting diode battle array
The type of drive of row is to control the opening and closing, when driver control light-emitting diodes of all light emitting diode strings in array simultaneously
When in pipe array, all of light emitting diode string is opened, the capacitor being connected to driver output end need to provide the biggest electricity
Diffluence supply light emitting diode matrix uses so that can produce relatively large ripple current on capacitor, cause the temperature liter of capacitor
Height, thus shorten the service life of capacitor.
Utility model content
In view of this, this utility model embodiment provides a kind of backlight module and display device, and main purpose is to avoid driving
The temperature of the capacitor of the outfan of dynamic device raises, to extend the service life of capacitor.
For reaching above-mentioned purpose, this utility model mainly provides following technical scheme:
On the one hand, this utility model embodiment provides a kind of backlight module, including:
Light emitting diode matrix, it includes that multiple light emitting diode string, each described light emitting diode string include multiple phase
The light emitting diode of series connection mutually；
Multiple switches, its quantity is identical with the quantity of described light emitting diode string, and the outfan of each described switch with
The negative pole of each described light emitting diode string connects；
Control unit, it includes that multiple first signal output part, each described first signal output part are opened described in each
The input closed connects, and it is identical that multiple described first signal output parts can send dutycycle, and has preset phase difference
Multiple pulse-width signals, to control opening or closing of multiple described switch；
Backlight driver, is connected with the positive pole of described control unit and multiple described light emitting diode string, for for described
Control unit and described light emitting diode matrix provide electric energy.
Specifically, described control unit includes that pulse width modulator module, described pulse width modulator module have multiple second
Signal output part, it is identical that multiple described secondary signal outfans enough send dutycycle, and it is many to have described preset phase difference
Individual described pulse-width signal, each described secondary signal outfan is connected with each described first signal output part.
Specifically, described control unit also includes control module and detection module, described control control module and described inspection
Survey module and described pulse width modulator module is all connected with；
Described detector unit is for detecting the bright dark degree of environment, and sends the bright dark journey with environment to described control module
Spending corresponding feedback signal, described control module is for regulating multiple described secondary signal outfans according to described feedback signal
The dutycycle size of the multiple described pulse-width signal sent.
Specifically, the described preset phase difference of multiple pulse-width signals of multiple described secondary signal outfans output
It it is 72 degree.
Specifically, described backlight driver output continuous stream.
Specifically, each described switch is power electric crystal switch.
On the other hand, this utility model embodiment also provides for a kind of display device, it include display panels and with institute
Stating the backlight module that display panels connects, described backlight module uses above-mentioned backlight module.
Specifically, described display device is notebook computer.
By technique scheme, this utility model backlight module and display device at least have the advantages that
The technical scheme that this utility model embodiment provides, multiple first signal output parts of control unit in backlight module
The multiple pulse-width signals sent have preset phase difference, so that control unit is by the plurality of pulse-width signal
Opening or closing of the switch that individual-phase control is connected with its first signal end in a staggered manner, and then alternately control light-emitting diodes
Multiple lumination of light emitting diode in pipe array, so that the capacitor of driver output end only needs the electricity providing moment less
Diffluence supplies the part light emitting diode string in all light emitting diode strings, it is to avoid produce bigger ripple electricity on capacitor
Stream, and then avoid the temperature rising of capacitor, extend the service life of capacitor.
Accompanying drawing explanation
The structured flowchart of a kind of backlight module that Fig. 1 provides for this utility model embodiment.
Detailed description of the invention
By further illustrating the technological means and effect that this utility model taked by reaching predetermined utility model purpose,
Below in conjunction with accompanying drawing and preferred embodiment, backlight module and the specific embodiment party of display device to foundation this utility model application
Formula, structure, feature and effect thereof, after describing in detail such as.In the following description, different " embodiments " or " embodiment " refers to
It is not necessarily same embodiment.Additionally, special characteristic, structure or feature in one or more embodiment can be by any suitable shapes
Formula combines.
As it is shown in figure 1, this utility model embodiment provides a kind of backlight module, including light emitting diode matrix 1, its bag
Including multiple light emitting diode string 11, each light emitting diode string 11 includes multiple light emitting diode being serially connected；Multiple switches
4, its quantity is identical with the quantity of light emitting diode string 11, and the outfan of each switch 4 and each light emitting diode string 11
Negative pole connects；Control unit 2, it includes multiple first signal output part, and each first signal output part is defeated with each switch 4
Entering end to connect, it is identical that multiple first signal output parts can send dutycycle, and multiple pulsewidths with preset phase difference are adjusted
Signal processed, to control opening or closing of multiple switch 4；Backlight driver 3, with control unit 2 and multiple light emitting diode string
The positive pole of 11 connects, for providing electric energy for control unit 2 and light emitting diode matrix 1.
In above-mentioned backlight module, each first signal output part of control unit 2 connects with the input of each switch 4
Connect, and the outfan of each switch 4 is connected with each light emitting diode string 11, and, each first signal of control unit 2 is defeated
Go out to hold the pulse-width signal sent can have opening time and the shut-in time controlling switch 4, so that from first
The pulse-width signal that signal output part sends can control each luminous two by controlling opening or closing of each switch 4
The luminescence of all Light-Emitting Diodes in pole pipe string 11 or stopping luminescence.Backlight driver 3 can be booster type power supply changeover device
Framework, after boost converter, the power supply of boosting output one DC voltage offer light emitting diode matrix 1 and control unit 2 is defeated
Enter.The dutycycle of the multiple pulse-width signals sent due to first signal output parts multiple in control unit 2 is equal in magnitude,
Ensure that in each light emitting diode string 11, the fluorescent lifetime of Light-Emitting Diode is equal, meanwhile, multiple pulse-width signals have
There is preset phase difference, say, that the multiple pulsewidth modulations letter sent from multiple first signal output parts of control unit 2
Number be not synchronous, but the starting point of each pulse-width signal to have preset phase poor, and this preset phase difference
Depending on can be according to practical situation, therefore, under the control of multiple pulse-width signals, multiple switches 4 can control to flow into multiple
Light emitting diode string 11 turns on electric current be completely independent, so that the light emitting diode in multiple Light-Emitting Diode string is alternately sent out
Light, or, the staggered complementation of the conducting electric current in multiple light emitting diode strings 11, so that in multiple light emitting diode string 11
Having part-time overlap luminous during light emitting diode alternately luminescence, the most all light emitting diode strings 11 are average in time domain
Distribution energy, rather than as prior art, the luminescence while of light emitting diode in all light emitting diode strings 11, because of
This, the capacitor of backlight driver 3 outfan need not be in moment provides a big energy for all light emitting diode strings 11
Light-Emitting Diode is simultaneously luminous, it is to avoid produces bigger ripple current on capacitor, and then avoids the temperature liter of capacitor
Height, extends the service life of capacitor.
The backlight module that this utility model embodiment provides, it is multiple that multiple first signal output parts of control unit send
Pulse-width signal has preset phase difference, so that control unit passes through the plurality of pulse-width signal with staggered side
Opening or closing of the switch that formula individual-phase control is connected with its first signal end, and then alternately control in light emitting diode matrix
Multiple lumination of light emitting diode, so that the capacitor of driver output end only needs the electric current providing moment less to go to supply institute
There is a part light emitting diode string in light emitting diode string, it is to avoid produce bigger ripple current on capacitor, and then avoid
The temperature of capacitor raises, and extends the service life of capacitor, and meanwhile, the capacitance of capacitor can reduce, and then electric capacity
The volume of device can also reduce, so that integrated circuit power component and usable floor area all can reduce.
Specifically, seeing Fig. 1, control unit 2 includes that pulse width modulator module 21, pulse width modulator module 21 have multiple
Secondary signal outfan, it is identical that multiple secondary signal outfans enough send dutycycle, and has multiple arteries and veins of preset phase difference
Wide modulated signal, each secondary signal outfan is connected with each first signal output part.Control unit 2 includes pulse width modulator
Module 21, and each first signal output part of each secondary signal outfan of pulse width modulator module 21 and control monocycle is even
Connect, so that control unit 2 is sent by pulse width modulator has identical dutycycle, and there is preset phase difference
Multiple pulse-width signals.
Specifically, seeing Fig. 1, control unit 2 also includes control module 2 and detection module 23, controls control module 2 and inspection
Survey module 23 and pulse width modulator module 21 is all connected with；Detector unit is used for detecting the bright dark degree of environment, and to control module 2
Sending the feedback signal corresponding with the bright dark degree of environment, control module 2 is for according to multiple second letter of feedback signal regulation
The dutycycle size of number multiple pulse-width signals that outfan sends.Can be detected residing for backlight module by detection module 23
The bright darkness of environment, when it detects that environment relatively becomes clear, then sends, to control module 2, the corresponding feedback that relatively becomes clear with environment
Signal, control module 2 will control pulse width modulator module 21 and reduce the dutycycle of multiple pulse-width signal, multiple to increase
The fluorescent lifetime of the light emitting diode in light emitting diode string 11, so that the light that light emitting diode matrix 1 is sent is brighter, instead
It, when detector unit detects that environment is dark, then send corresponding feedback signal dark with environment, control to control module 2
Molding block 2 will control pulse width modulator module 21 and increase the dutycycle of multiple pulse-width signal, to reduce multiple luminous two
The fluorescent lifetime of the light emitting diode in pole pipe string 11, so that the light that light emitting diode matrix 1 is sent is dark, so that using
The experience at family is more preferably.
Specifically, the preset phase difference of multiple pulse-width signals of multiple secondary signal outfans output can be 72
Degree, the dutycycle that can control multiple pulse-width signal changes between 0% to 100%, on the one hand, can realize adjusting luminescence
The shading value of the light that diode array is sent, on the other hand, turn on multiple switches 4 owing to the split-phase in time domain drives, when
When the dutycycle of multiple pulse-width signals is less than 20%, each light emitting diode string 11 turns on time domain and is completely independent, and each arm is led
Galvanization phase place is completely independent, and each arm electric current is without staggered.When the dutycycle of multiple pulse-width signals is equal to 20%, each arm is led
There is staggered complementation the logical time, relative, and each arm conducting electric current also has staggered complementation, therefore, total input of light emitting diode matrix 1
Electric current is zero never, and each arm electric current is equal, and therefore, the ripple current on the output capacitor of backlight driver 3 is zero,
Input current root-mean-square value also diminishes, when the dutycycle of multiple pulse-width signals is respectively 40%, 60%, 80% and 100%
Time, the meansigma methods of total input current is equal to root-mean-square value, this phenomenon be arm switch 4 open or close fully staggered complementation,
Ripple current ideal value on capacitor is zero, it is to avoid the temperature of capacitor raises.
Specifically, backlight driver 3 output continuous stream.It is beneficial to control light emitting diode matrix 1 and provides controllable
Fixing display brightness.
Specifically, owing to power electric crystal switch 4 has switch 4 speed soon, 4 small loss and other features, therefore, this reality are switched
By new embodiment, switch 4 is preferably power electric crystal switch 4.
This utility model embodiment additionally provides a kind of display device, and it includes display panels and and LCD
The backlight module that plate connects, this backlight module includes light emitting diode matrix 1, and it includes multiple light emitting diode string 11, each
Light emitting diode string 11 includes multiple light emitting diode being serially connected；Multiple switches 4, its quantity and light emitting diode string 11
Quantity is identical, and the outfan of each switch 4 is connected with the negative pole of each light emitting diode string 11；Control unit 2, it includes many
Individual first signal output part, each first signal output part is connected with the input of each switch 4, multiple first signal output parts
Dutycycle can be sent identical, and there are multiple pulse-width signals of preset phase difference, to control opening of multiple switch 4
Or close；Backlight driver 3, is connected with the positive pole of control unit 2 and multiple light emitting diode string 11, is used for as control unit 2
Electric energy is provided with light emitting diode matrix 1.
The display device that this utility model embodiment provides, including backlight module, in this backlight module, control unit is many
Multiple pulse-width signals that individual first signal output part sends have preset phase difference, so that control unit is by being somebody's turn to do
Opening or closing of the switch that multiple pulse-width signals individual-phase control in a staggered manner is connected with its first signal end, and then
Alternately control the multiple lumination of light emitting diode in light emitting diode matrix, so that the capacitor of driver output end only needs
The moment less electric current is provided to remove the part light emitting diode string supplying in all light emitting diode strings, it is to avoid to produce on capacitor
Raw bigger ripple current, and then avoid the temperature rising of capacitor, extend the service life of capacitor, meanwhile, electric capacity
The capacitance of device can reduce, and then the volume of capacitor can also reduce, so that integrated circuit power component and the face of use
Amass and all can reduce.
Specifically, this display device can be notebook computer.
The above, detailed description of the invention the most of the present utility model, but protection domain of the present utility model does not limit to
In this, any those familiar with the art, in the technical scope that this utility model discloses, can readily occur in change
Or replace, all should contain within protection domain of the present utility model.Therefore, protection domain of the present utility model should be with described power
The protection domain that profit requires is as the criterion.
Claims (8)
1. a backlight module, it is characterised in that including:
Light emitting diode matrix, it includes that multiple light emitting diode string, each described light emitting diode string include multiple mutual string
The light emitting diode of connection；
Multiple switches, its quantity is identical with the quantity of described light emitting diode string, and the outfan of each described switch is with each
The negative pole of described light emitting diode string connects；
Control unit, it includes multiple first signal output part, each described first signal output part and each described switch
Input connects, and it is identical that multiple described first signal output parts can send dutycycle, and has the multiple of preset phase difference
Pulse-width signal, to control opening or closing of multiple described switch；
Backlight driver, is connected with the positive pole of described control unit and multiple described light emitting diode string, is used for as described control
Unit and described light emitting diode matrix provide electric energy.
Backlight module the most according to claim 1, it is characterised in that
Described control unit includes that pulse width modulator module, described pulse width modulator module have multiple secondary signal outfan,
It is identical that multiple described secondary signal outfans can send dutycycle, and has the multiple described pulsewidth of described preset phase difference
Modulated signal, each described secondary signal outfan is connected with each described first signal output part.
Backlight module the most according to claim 2, it is characterised in that
Described control unit also includes control module and detection module, described control module and described detection module and described pulsewidth
Modulator block is all connected with；
Described detector unit is for detecting the bright dark degree of environment, and sends the bright dark degree phase with environment to described control module
Corresponding feedback signal, described control module sends for regulating multiple described secondary signal outfans according to described feedback signal
The dutycycle size of multiple described pulse-width signal.
Backlight module the most according to claim 3, it is characterised in that
The described preset phase difference of the multiple described pulse-width signal of multiple described secondary signal outfans output is 72 degree.
Backlight module the most according to claim 4, it is characterised in that
Described backlight driver output continuous stream.
Backlight module the most according to claim 5, it is characterised in that
Each described switch is power electric crystal switch.
7. a display device, it includes display panels and the backlight module being connected with described display panels, and it is special
Levy and be,
Described backlight module uses the backlight module according to any one of claim 1 to 6.
Display device the most according to claim 7, it is characterised in that
Described display device is notebook computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620556937.1U CN205751478U (en) | 2016-06-08 | 2016-06-08 | Backlight module and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620556937.1U CN205751478U (en) | 2016-06-08 | 2016-06-08 | Backlight module and display device |
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| CN205751478U true CN205751478U (en) | 2016-11-30 |
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| CN201620556937.1U Active CN205751478U (en) | 2016-06-08 | 2016-06-08 | Backlight module and display device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109003581A (en) * | 2018-08-03 | 2018-12-14 | 深圳市华星光电半导体显示技术有限公司 | Backlight drive control method and system |
| CN113674623A (en) * | 2021-08-13 | 2021-11-19 | Tcl华星光电技术有限公司 | Backlight panel, backlight module and display device |
| US11205666B2 (en) | 2018-04-28 | 2021-12-21 | Wuhan China Star Optoelectronics Technology Co., Ltd | Array substrate and display panel |
| CN114783385A (en) * | 2022-04-19 | 2022-07-22 | 惠科股份有限公司 | Backlight module and display device |
| CN117079577A (en) * | 2023-10-18 | 2023-11-17 | 惠科股份有限公司 | Display panel, driving method of display panel and display device |
-
2016
- 2016-06-08 CN CN201620556937.1U patent/CN205751478U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11205666B2 (en) | 2018-04-28 | 2021-12-21 | Wuhan China Star Optoelectronics Technology Co., Ltd | Array substrate and display panel |
| CN109003581A (en) * | 2018-08-03 | 2018-12-14 | 深圳市华星光电半导体显示技术有限公司 | Backlight drive control method and system |
| WO2020024344A1 (en) * | 2018-08-03 | 2020-02-06 | 深圳市华星光电半导体显示技术有限公司 | Backlight driving control method and system |
| US10854148B2 (en) | 2018-08-03 | 2020-12-01 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Method and system of controlling backlight driving |
| CN113674623A (en) * | 2021-08-13 | 2021-11-19 | Tcl华星光电技术有限公司 | Backlight panel, backlight module and display device |
| US12058791B2 (en) | 2021-08-13 | 2024-08-06 | Tcl China Star Optoelectronics Technology Co., Ltd. | Backlight board, backlight module, and display device |
| CN114783385A (en) * | 2022-04-19 | 2022-07-22 | 惠科股份有限公司 | Backlight module and display device |
| CN117079577A (en) * | 2023-10-18 | 2023-11-17 | 惠科股份有限公司 | Display panel, driving method of display panel and display device |
| CN117079577B (en) * | 2023-10-18 | 2024-03-19 | 惠科股份有限公司 | Display panel, driving method of display panel and display device |
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