CN206921445U - A kind of LED backlight driving plate - Google Patents
A kind of LED backlight driving plate Download PDFInfo
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- CN206921445U CN206921445U CN201720726514.4U CN201720726514U CN206921445U CN 206921445 U CN206921445 U CN 206921445U CN 201720726514 U CN201720726514 U CN 201720726514U CN 206921445 U CN206921445 U CN 206921445U
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- backlight
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- adjustment module
- msp430
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- 230000005669 field effect Effects 0.000 claims abstract description 23
- 239000013078 crystal Substances 0.000 claims description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 235000013399 edible fruits Nutrition 0.000 description 2
- 230000004224 protection Effects 0.000 description 2
- 235000007516 Chrysanthemum Nutrition 0.000 description 1
- 244000189548 Chrysanthemum x morifolium Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The utility model discloses a kind of LED backlight driving plate, it is arranged between TV SOC plates and LED backlight plate, including a pcb board, be provided with pcb board for be connected with TV SOC plates signal input interface, for be connected with LED backlight plate LED backlight interface, one be used for the MSP430 master chips of signal converting, a backlight adjustment module, a power interface, a backlight subarea controlling switch, one be used to change the LDO power supply chips of voltage, some field-effect transistors.Signal input interface connects MSP430 master chips and the input of backlight adjustment module.The output end connection MSP430 master chips of power interface and the input of backlight adjustment module.LDO power supply chips are connected between signal input interface and MSP430 master chips.Field-effect transistor is connected between signal input interface and backlight adjustment module.The input of the output end connection backlight adjustment module of MSP430 master chips.Output end connection LED backlight interface, the input of MSP430 master chips and the input of backlight subarea controlling switch of backlight adjustment module.
Description
Technical field
Liquid crystal TV set field is the utility model is related to, more particularly to a kind of LED backlight driving plate
Background technology
Liquid crystal TV set liked with the picture of its high quality by consumers in general, but is in order at and reduces examining for cost
Consider, most liquid crystal displays are not controlled LED backlight brightness, and LED brightness value is always consistent, and it is big power consumption to be present, color
The shortcomings that color saturation degree difference.
Utility model content
Main purpose of the present utility model is to propose a kind of LED backlight driving plate, it is intended to the LED backlight brightness to liquid crystal display
It is controlled, by low-power consumption, improves color saturation and image quality.
To achieve the above object, the utility model proposes LED backlight driving plate, be arranged on TV SOC plates and LED backlight
Between plate, including a pcb board, be provided with the pcb board for be connected with the TV SOC plates signal input interface, be used for
MSP430 master chips, a backlight adjustment module, the electricity that the LED backlight interface that is connected with LED backlight plate, one are used for signal converting
Source interface, a backlight subarea controlling switch, one are used to change the LDO power supply chips of voltage, some field-effect transistors.The letter
Number input interface connects the MSP430 master chips and the input of the backlight adjustment module.The output end of the power interface
Connect the MSP430 master chips and the input of the backlight adjustment module.The LDO power supply chips are connected to the signal
Between input interface and the MSP430 master chips.The field-effect transistor is connected to the signal input interface and the back of the body
Between light adjustment module.The output end of the MSP430 master chips connects the input of the backlight adjustment module.The backlight
The output end of adjustment module connects the LED backlight interface, the input of the MSP430 master chips and backlight subarea control
Make the input of switch.
Preferably, the backlight adjustment module is made up of six iw7027 chips, and chrysanthemum is used between the iw7027 chips
Pattern chain formula framework connects.The output end of the 5th iw7027 chips and the 6th iw7027 chips connects the backlight subarea control
The input of switch.
Preferably, the quantity of the field-effect transistor is arranged to two, the output end of first field-effect transistor
The first iw7027 chips, the 2nd iw7027 chips, the input of the 3rd iw7027 chips are connected, second field-effect is brilliant
The output end of body pipe connects the 4th iw7027 chips, the 5th iw7027 chips, the input of the 6th iw7027 chips.
Preferably, in addition to the MSP430 master chips one be connected is used to provide clock for the MSP430 master chips
The reset chip of the crystal oscillator of effect, a guarantee system normal operation.
Preferably, connected between the signal input interface and the MSP430 master chips by spi bus, it is described
Connected between MSP430 master chips and the backlight adjustment module by spi bus.
Preferably, it is additionally arranged a signal output interface, it is the signal output interface and the signal input interface, described
The output end of MSP430 master chips and the backlight subarea controlling switch connects.
Compared with prior art, the beneficial effects of the utility model are：Carried out by LED backlight brightness of the region to liquid crystal display
Control so that different brightness value corresponding to the image of different zones, during pure white field, LED luminance is maximum, during black field, closes
LED, power consumption is reduced, improve color saturation and image quality.
Brief description of the drawings
Fig. 1 is the module map of the utility model LED backlight driving plate；
Fig. 2 is the circuit theory diagrams of the utility model MSP430 master chips；
Fig. 3 is the circuit theory diagrams of the iw7027 chips of the utility model the first；
Fig. 4 is the circuit theory diagrams of the utility model LDO power supply chips；
Fig. 5 is the circuit theory diagrams of the field-effect transistor of the utility model first；
Embodiment
A kind of LED backlight driving plate that the present embodiment proposes, the LED backlight driving plate are connected to TV SOC plates (in figure not
Show) between LED backlight plate (not shown), wherein, TV SOC plates are television system mainboard, and LED backlight plate is liquid crystal
Backlight on display backlight source.
As shown in figure 1, the LED backlight driving plate includes a pcb board, pcb board, which is provided with, is used for what is be connected with TV SOC plates
Signal input interface 3, the LED backlight interface 4, one for being connected with LED backlight plate are used for the MSP430 master chips of signal converting
1st, a backlight adjustment module 2, a power interface 7, a backlight subarea controlling switch 8, one are used for the LDO power supply chips for changing voltage
5th, some field-effect transistors 6.Signal input interface 3 connects MSP430 master chips 1 and the input of backlight adjustment module 2.Electricity
The output end connection MSP430 master chips 1 of source interface 7 and the input of backlight adjustment module 2.LDO power supply chips 5 are connected to letter
Number between input interface 3 and MSP430 master chips 1.Field-effect transistor 6 is connected to signal input interface 3 and backlight adjustment module
Between 2.The input of the output end connection backlight adjustment module 2 of MSP430 master chips 1.The output end of backlight adjustment module 2 connects
Connect the input of LED backlight interface 4, the input of MSP430 master chips 1 and backlight subarea controlling switch 8.
It should be noted that a kind of low-power consumption MCU single-chip of the MSP430 master chips 1 using TI companies, backlight regulation mould
Using the iW7027 chips of dialog semiconductor companies, both combine block 2, have the spy for forming independent drive module
Property (MSP430 can independent control iW7027 initialization) and high speed SPI interface, there is larger flexibility.Support 12bit light modulations
Brightness, dimming scope is from 0%~99.9%.VSYNC (frame rate) inputs are supported, input range is 50Hz~480Hz.Support
MOS excess temperature automatic protections, LED open circuits and the automatic monitoring function of short circuit.Fig. 2 be MSP430 master chips 1 circuit theory diagrams, Fig. 3
For the circuit theory diagrams of the first iw7027 chips.
Signal input interface 3 sends control signal EN-430, Vsync_B, EN1_1, EN2_2 to MSP430 master chips 1,
SPI order control operations are carried out to MSP430 master chips 1 by spi bus, the work shape of MSP430 master chips 1 can be controlled
State, and realize the brightness adjustment of backlight.It is MSP430 master chips 1 and backlight meanwhile signal input interface 3 is circumscribed with 12V voltages
Adjustment module 2 is powered, and the 12V electricity that LDO power supply chips 5 can input a signal into the output of interface 3 is converted to 3.3V fax and is defeated by
MSP430 master chips 1.Field-effect transistor 6 can input a signal into EN1_1, EN2_2 signal that interface 3 is sent and send to backlight
Whether adjustment module 2, control backlight adjustment module 2 work.Backlight adjustment module 2 can export the power supply letter provided for backlight
Number and LED backlight brightness control signal to LED backlight interface 4.MSP430 master chips 1 can send Vsync synchronizing signals to the back of the body
Light adjustment module 2, keeps the stability of the internal signal of backlight adjustment module 2, and backlight adjustment module 2 can send FAULT_OUT
Error signal is to MSP430 master chips 1, so as to feed back the failures such as the open circuit of appearance or short circuit.Meanwhile MSP430 master chips 1 and the back of the body
Light adjustment module 2 is also connected to 24V power supplys by power interface 7.Backlight subarea controlling switch 8 can be to backlight adjustment module 2
Subregion carries out switch control, so as to adapt to the liquid crystal screen backlight of different subregions.
It should be noted that the subregion of liquid crystal screen backlight is traditionally arranged to be 80th area or 96th area.Further, backlight is adjusted
Module 2 is made up of six iw7027 chips, is connected between iw7027 chips using daisy chain type framework, each iw7027 chips hair
Go out 16 control signals, controllable 96 subregions of maximum, the communication of itself and MSP430 master chips 1 is completed by spi bus.
SPI communication between MSP430 master chips 1 and six iW7027 chips is in addition to clock and piece choosing share, the data transmitted
Tandem is used, i.e. data are transferred to after the first iW7027 chips again from the first iW7027 cores from MSP430 master chips 1
Piece is transferred to the 2nd iW7027 chips, by that analogy, is finally delivered to the 6th iW7027 chips.5th iw7027 chips and the 6th
The output end of iw7027 chips connects the input of backlight subarea controlling switch 8 respectively, can be to the data of LED backlight driving plate
Selection selection output is carried out, if output D05 signals, LED backlight driving plate selects the driving of 80 subregions, if output D06 signals,
LED backlight driving plate selects the driving of 96 subregions.
Further, the quantity of field-effect transistor 6 is arranged to two, the output end connection of the first field-effect transistor 6
First iw7027 chips, the 2nd iw7027 chips, the input of the 3rd iw7027 chips, the output of the second field-effect transistor 6
The 4th iw7027 chips of end connection, the 5th iw7027 chips, the input of the 6th iw7027 chips, using two field effect transistors
The setting of pipe 6 can ensure the stability of output signal, ensure signal synchronism output and control.Fig. 5 is the first field effect transistor
The circuit theory diagrams of pipe.
Further, in addition to MSP430 master chips 1 one be connected is used to provide clock effect for MSP430 master chips 1
Crystal oscillator 9, one ensure system normal operation reset chip 10.It ensure that the stability of system operation and the effect of image
Fruit.The reset chip 10 being connected with MSP430 master chips 1 can detect before system operation to program, ensure program just
Often operation.
Further, connected between signal input interface 3 and MSP430 master chips 1 by spi bus, MSP430 master chips
Connected between 1 and backlight adjustment module 2 by spi bus.Using SPI communication agreement, it is ensured that signal transmission between module
Stability, meanwhile, structure and wiring are simple, save cost.
Further, it is additionally arranged a signal output interface 11, signal output interface 11 and signal input interface 3,
The output end of MSP430 master chips 1 and backlight subarea controlling switch 8 connects.It should be noted that the 6th iW7027 data are protected
Output interface is left, is transmitted output signal to signal output interface 11 by backlight subarea controlling switch 8.Signal output interface
11 can form master slave mode with external one piece of LED backlight driving plate (not shown), two pieces of LED backlight driving plates, and maximum can
To extend to 192 subregions, the liquid crystal screen backlight of bigger subregion is adapted to, the image quality and imaging for improving liquid crystal TV set are imitated
Fruit.
Upper is only preferred embodiment of the present utility model, not thereby limits the scope of the claims of the present utility model, every profit
The equivalent structure or equivalent flow conversion made with the utility model specification and accompanying drawing content, or directly or indirectly it is used in it
The technical field of his correlation, is similarly included in scope of patent protection of the present utility model.
Claims (6)
1. a kind of LED backlight driving plate, is arranged between TV SOC plates and LED backlight plate, it is characterised in that including a pcb board,
Be provided with the pcb board for be connected with the TV SOC plates signal input interface, for what is be connected with LED backlight plate
LED backlight interface, one are for the MSP430 master chips of signal converting, a backlight adjustment module, a power interface, a backlight subarea
Controlling switch, one are used to change the LDO power supply chips of voltage, some field-effect transistors；The signal input interface connects institute
State MSP430 master chips and the input of the backlight adjustment module；The output end of the power interface connects the MSP430 master
The input of chip and the backlight adjustment module；The LDO power supply chips be connected to the signal input interface with it is described
Between MSP430 master chips；The field-effect transistor be connected to the signal input interface and the backlight adjustment module it
Between；The output end of the MSP430 master chips connects the input of the backlight adjustment module；The backlight adjustment module it is defeated
Go out end and connect LED backlight interface, the input of the MSP430 master chips and the input of the backlight subarea controlling switch
End.
2. LED backlight driving plate as claimed in claim 1, it is characterised in that the backlight adjustment module is by six iw7027
Chip forms, respectively the first iw7027 chips, the 2nd iw7027 chips, the 3rd iw7027 chips, the 4th iw7027 chips, the
Five iw7027 chips, the 6th iw7027 chips, connected using daisy chain type framework between the iw7027 chips, wherein, it is described
The output end of 5th iw7027 chips and the 6th iw7027 chips connects the input of the backlight subarea controlling switch.
3. LED backlight driving plate as claimed in claim 2, it is characterised in that the quantity of the field-effect transistor is arranged to
Two, respectively the first field-effect transistor, the second field-effect transistor, the output end connection of first field-effect transistor
The first iw7027 chips, the 2nd iw7027 chips, the input of the 3rd iw7027 chips, second field-effect transistor
Output end connect the 4th iw7027 chips, the 5th iw7027 chips, the input of the 6th iw7027 chips.
4. LED backlight driving plate as claimed in claim 1, it is characterised in that also include being connected with the MSP430 master chips
One be used for for the MSP430 master chips provides clock act on crystal oscillator, one guarantee system normal operation reset coil
Piece.
5. LED backlight driving plate as claimed in claim 1, it is characterised in that the signal input interface and the MSP430
Connected by spi bus between master chip, connected between the MSP430 master chips and the backlight adjustment module by spi bus
Connect.
6. the LED backlight driving plate as described in Claims 1 to 5 is any, it is characterised in that a signal output interface is additionally arranged,
The signal output interface and the signal input interface, the MSP430 master chips and the backlight subarea controlling switch
Output end connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720726514.4U CN206921445U (en) | 2017-06-21 | 2017-06-21 | A kind of LED backlight driving plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720726514.4U CN206921445U (en) | 2017-06-21 | 2017-06-21 | A kind of LED backlight driving plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206921445U true CN206921445U (en) | 2018-01-23 |
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ID=61321965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720726514.4U Expired - Fee Related CN206921445U (en) | 2017-06-21 | 2017-06-21 | A kind of LED backlight driving plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206921445U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109064980A (en) * | 2018-09-25 | 2018-12-21 | 四川长虹电器股份有限公司 | Liquid crystal display backlight multi partition control device |
-
2017
- 2017-06-21 CN CN201720726514.4U patent/CN206921445U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109064980A (en) * | 2018-09-25 | 2018-12-21 | 四川长虹电器股份有限公司 | Liquid crystal display backlight multi partition control device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180123 Termination date: 20190621 |