CN206864163U - The control circuit and display terminal of a kind of backlight - Google Patents
The control circuit and display terminal of a kind of backlight Download PDFInfo
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- CN206864163U CN206864163U CN201720446586.3U CN201720446586U CN206864163U CN 206864163 U CN206864163 U CN 206864163U CN 201720446586 U CN201720446586 U CN 201720446586U CN 206864163 U CN206864163 U CN 206864163U
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- backlight
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- quasi resonant
- resonant circuit
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Abstract
The utility model embodiment discloses the control circuit and display terminal of a kind of backlight, and the control circuit includes microcontroller chip, backlight driving chip and Half Bridge Quasi Resonant circuit；Wherein, the backlight driving chip, it is respectively connected with the microcontroller chip and the backlight, the backlight control signal sent for obtaining the microcontroller chip, and the driving current by detecting backlight produces voltage adjustment signal corresponding with the backlight region；The Half Bridge Quasi Resonant circuit, is connected with the backlight driving chip, for obtaining the voltage adjustment signal, and according to the supply voltage of the voltage adjustment signal adjustment backlight region；The backlight, it is connected with the Half Bridge Quasi Resonant circuit, for adjusting the brightness of the backlight region according to the supply voltage.By using such scheme, while local backlight regulation is realized, the power consumption of backlight can be not only reduced, while the effect for reducing PCB Material Costs can also be reached.
Description
Technical field
The utility model embodiment is related to display technology field, more particularly to a kind of control circuit of backlight and display are eventually
End.
Background technology
With the development of science and technology, LED (Light Emitting Diode, light emitting diode) is used as liquid crystal display
Backlight be widely used.Especially after world cup in 2014,4K TVs containing LED backlight (can receive,
Decoding and the vision signal TV of display corresponding resolution) receive pursuing for more and more consumers, at the same time, backlight
The energy consumed also result in the concern of major TV, liquid crystal manufacturer.
In the prior art, typically using the control backlight work of following type of drive：1st, backlight is driven using constant-current source
Source；2nd, multiple DC-DC circuits are connected with power end, the VRM Voltage Regulator Module as backlight.
For the first above-mentioned type of drive, what it is due to the output of this type of drive is constant magnitude of voltage, therefore backlight
The luminosity in source keeps constant.When occurring bright and dark scene in the display screen of TV simultaneously, due to backlight
Driving current constant, then light and shade contrast is poor in tv display screen.For above-mentioned second of type of drive, due to circuit
Middle backlight is divided into N number of zonule, it is therefore desirable to adds N number of DC-DC VRM Voltage Regulator Modules to adjust the control of N number of zonule
Voltage, this adds the space of PCB (Printed Circuit Board, printed circuit board (PCB)), adds thing to a certain extent
Expect cost, while also increase one-level energy consumption, reduce drive efficiency.
Utility model content
The utility model embodiment provides a kind of control circuit and display terminal of backlight, realizes according to display screen
The bright-dark degree of middle picture adjusts the brightness of backlight in real time, not only reduces the power consumption of backlight, while has brought user
Good viewing experience.
In a first aspect, the utility model embodiment provides a kind of control circuit of backlight, the circuit is applied to display
In terminal, the display terminal has backlight, and the control circuit includes：Microcontroller chip, backlight driving chip and half-bridge are accurate
Resonance circuit, the backlight driving chip are connected with the microcontroller chip, backlight and Half Bridge Quasi Resonant circuit respectively, and described half
Bridge quasi-resonance circuit is also connected with the backlight, wherein,
The backlight driving chip is used to receive the backlight control signal that the microcontroller chip is sent, according to the backlight control
Signal processed and the driving current by detecting backlight, voltage adjustment signal corresponding with each region in the backlight is produced,
And the voltage adjustment signal is sent to the Half Bridge Quasi Resonant circuit；
The Half Bridge Quasi Resonant circuit is used for the confession that each region in the backlight is adjusted according to the voltage adjustment signal
Piezoelectric voltage.
Further, the control circuit also includes the first diode and the second diode, wherein,
The anode of first diode is connected with the negative electrode of second diode；
The negative electrode of first diode is connected with the feedback pin of the backlight driving chip；
The anode of second diode is connected with the Half Bridge Quasi Resonant circuit.
Further, the control circuit also includes：Filter circuit and circuit of power factor correction, wherein,
The input of the filter circuit is connected with power network, and output end is connected with the circuit of power factor correction, is used for
Filter out the electromagnetic interference signal in the control circuit；
The output end of the circuit of power factor correction is connected with the input of the Half Bridge Quasi Resonant circuit, for filter
Voltage signal after ripple carries out PFC and adjustment, to improve the power factor of the control circuit.
Further, the control circuit also includes：Overvoltage crowbar, it is connected with the Half Bridge Quasi Resonant circuit, uses
When the maximum of predeterminated voltage is reached when the supply voltage, the Half Bridge Quasi Resonant circuit breaker is controlled.
Further, the microcontroller chip is MSP430G series.
Further, the model IW7027 of the backlight driving chip.
Second aspect, the utility model embodiment provide a kind of display terminal, and the display terminal includes backlight, also
Include the control circuit of any described backlight.
The utility model embodiment provides the control circuit and display terminal of a kind of backlight, and the display terminal has
Backlight, the control circuit include：Microcontroller chip, backlight driving chip and Half Bridge Quasi Resonant circuit；Wherein, the backlight is driven
Dynamic chip, is respectively connected with the microcontroller chip and the backlight, the backlight control sent for obtaining the microcontroller chip
Signal, and the driving current by detecting backlight produces voltage adjustment signal corresponding with the backlight region；Described half
Bridge quasi-resonance circuit, is connected with the backlight driving chip, is adjusted for obtaining the voltage adjustment signal, and according to the voltage
Entire signal adjusts the supply voltage of the backlight region；The backlight, it is connected with the Half Bridge Quasi Resonant circuit, for root
The brightness of the backlight region is adjusted according to the supply voltage.By using above-mentioned technical proposal, microcontroller chip can pass through
Backlight driving chip is indirectly controlled Half Bridge Quasi Resonant circuit, then adjusts the supply voltage of backlight in real time.Relative to existing
There is the supply voltage for controlling backlight in technology by multiple DC-DC modules, this programme eliminates DC-DC module, directly will
Half Bridge Quasi Resonant circuit is connected with backlight, while Material Cost is saved, can also reduce the conversion of one-level efficiency, while also may be used
Reach the effect of the viewing experience of lifting user.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the control circuit for backlight that the utility model embodiment one provides；
Fig. 2 is a kind of backlight driving chip member control circuit figure that the utility model embodiment one provides；
Fig. 3 is a kind of feedback circuit schematic diagram for Half Bridge Quasi Resonant circuit that the utility model embodiment one provides；
Fig. 4 is a kind of structured flowchart of the control circuit for backlight that the utility model the present embodiment two provides.
Embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than to restriction of the present utility model.Further need exist for
It is bright, for the ease of description, the part related to the utility model rather than entire infrastructure are illustrate only in accompanying drawing.
Embodiment one
Fig. 1 is a kind of structural representation of the control circuit for backlight that the utility model embodiment one provides；The circuit
It can be integrated into display terminal, the display terminal has backlight, and the circuit can be used for the brightness of adjustment backlight.Such as Fig. 1 institutes
Show, the control circuit of the backlight specifically includes：Microcontroller chip 110, backlight driving chip 120, the and of Half Bridge Quasi Resonant circuit 130
Backlight 140.
The backlight driving chip 120 respectively with the microcontroller chip 110, backlight 140 and Half Bridge Quasi Resonant circuit 130
Connection, the Half Bridge Quasi Resonant circuit 130 are also connected with the backlight 140.
Wherein, the backlight driving chip 120, the backlight control signal sent for obtaining the microcontroller chip 110, root
According to the backlight control signal and the driving current by detecting backlight, electricity corresponding with each region in the backlight is produced
Pressure adjustment signal, and the voltage adjustment signal is sent to the Half Bridge Quasi Resonant circuit 130；The Half Bridge Quasi Resonant circuit
130, it is connected with the backlight driving chip 120, for obtaining the voltage adjustment signal, and according to the voltage adjustment signal
Adjust the supply voltage of the backlight region；The backlight 140, it is connected with the Half Bridge Quasi Resonant circuit 130, for root
The brightness of the backlight region is adjusted according to the supply voltage.
Exemplary, display terminal can be LCD TV, or exist backlight such as public advertising board or vapour
The other display equipments such as car display instrument.Exemplary, backlight is preferably LED, can be by backlight in practical work process
It is divided into the how individual backlight regions of N.After system level chip (System on Chip, SOC) collects video signal, pass through
The SPI interface of microcontroller chip, view data can be sent to microcontroller chip.Microcontroller chip will be to every after view data is received
One frame video image carries out the processing such as decoding, and obtains monochrome information corresponding with each backlight region.Because different brightness are believed
The supply voltage and pre-set current value of the corresponding backlight of breath are different, therefore, can be with by the supply voltage for adjusting backlight
The shading value of the corresponding backlight of adjustment can reach energy-conservation, strengthen the purpose of image quality.
Exemplary, the model of microcontroller chip 110 (hereinafter referred to as MCU) is preferably MSP430G series.Wherein, MCU
MISI-A interfaces are used to send signal, and MISO-A interfaces are used for reception signal.Wherein, MCU is by handling view data
Afterwards, backlight control signal is sent to by backlight driving chip 120 by MISI-A interfaces.
Specifically, MCU can be realized the brightness data of reception SOC transmissions and be driven to backlight by following three functions
Dynamic chip sends backlight control signal, to realize real-time brightness refresh function：
system_power_on_daisy_chain()；IW7027 initialization functions
#pragma vector=USCIAB0RX_VECTOR__interrupt void USCI0RX_ISR ()；Receive number
According to
Update_256_Zones_All_Brightness()；Refresh brightness
Exemplary, the model of backlight driving chip 120 is preferably IW7027.Fig. 2 is that the utility model embodiment one carries
A kind of backlight driving chip member control circuit figure supplied.Because backlight driving chip is connected with backlight, therefore backlight drive
Chip 120 receiving the backlight control signal of the transmission of microcontroller chip 110, (protect by the driving current for referring mainly to control backlight here
Hold in constant current range) after, it may be determined that the driving current of current time backlight.As shown in Fig. 2 backlight driving chip
120 can feed back the real work electric current of detected backlight region (in S1-S16 by S1-S16 pins to microcontroller chip 110
Each passage correspond to a string of LEDs).Due to each backlight region corresponding with the image content in display screen
In the presence of a pre-set current value, if backlight driving chip 120 detects that some backlight region A real work electric current is less than
During corresponding pre-set current value, then each of backlight driving chip 120 that the LED from backlight region A is connected is led to
In the electric current that road is fed back, the electric current for selecting current amplitude minimum draws as target adjustment electric current, and by FB as shown in Figure 2
Pin sends voltage adjustment signal to Half Bridge Quasi Resonant circuit 130.
Exemplary, the model of the pulse frequency modulation controller in Half Bridge Quasi Resonant circuit 130 is preferably FAN7631.Half-bridge
Quasi-resonance circuit 130, can be based on the feedback electricity of its own after the voltage adjustment signal of the transmission of backlight driving chip 120 is received
Road generation and supply voltage corresponding to different backlight regions.Due to Half Bridge Quasi Resonant circuit 130 and 140 direct phase of backlight
Even, therefore the supply voltage of backlight region can be directly adjusted, relative to being adjusted in the prior art by multiple DC-DC modules
The mode of the supply voltage of backlight region, the means of voltage regulation that scheme is provided is more efficient, and energy consumption is smaller, while also saves
The Material Cost of pcb board is saved.
Fig. 3 is a kind of feedback circuit schematic diagram for Half Bridge Quasi Resonant circuit that the utility model embodiment one provides.Such as Fig. 3
Shown, the input of the feedback circuit is connected with the FB pins of backlight control chip 120, can be adjusted above-mentioned target by FB pins
After magnitude of voltage corresponding to whole electric current is input to the feedback circuit, and then the backlight after the exportable adjustment of Half Bridge Quasi Resonant circuit
Supply voltage.Backlight region for being currently needed for adjustment, because the current amplitude of target adjustment electric current is in backlight drive core
It is minimum in the S1-S16 passages of piece 120, therefore, the power supply of current backlight source region need to be increased by Half Bridge Quasi Resonant circuit 130
Voltage.Simultaneously as backlight driving chip FB pins output be a linear change magnitude of voltage, therefore, half-bridge standard is humorous
The circuit that shakes can control the supply voltage of backlight in real time according to the magnitude of voltage of above-mentioned linear change.
Specifically, so that the part scene in display screen is by secretly brightening as an example, because the brightness of scene is from being secretly switched to
Bright, then the electric current of backlight region also needs to increase corresponding to the part scene.And due to the power supply electricity of the backlight region
Pressure can not be mutated, and therefore, voltage adjustment signal corresponding to the backlight region can be sent into half-bridge by backlight driving chip
Quasi-resonance circuit, the feedback circuit in Half Bridge Quasi Resonant circuit can raise the backlight region after voltage adjustment signal is received
Supply voltage so that the luminosity increase of the backlight, the brightness of display picture is enhanced.
Further, Half Bridge Quasi Resonant circuit 130 includes over-current protection device (OCP), when the driving current of backlight is big
When rated current, Half Bridge Quasi Resonant circuit 130 will automatically power off, and then protect backlight to be not damaged by.
A kind of control circuit of backlight is present embodiments provided, the control circuit includes：Microcontroller chip, backlight drive
Chip and Half Bridge Quasi Resonant circuit, the backlight driving chip are electric with the microcontroller chip, backlight and Half Bridge Quasi Resonant respectively
Road is connected, and the Half Bridge Quasi Resonant circuit is also connected with the backlight, wherein, the backlight driving chip is described for receiving
The backlight control signal that microcontroller chip is sent, according to the backlight control signal and the driving current by detecting backlight, production
Raw voltage adjustment signal corresponding with each region in the backlight, and it is humorous that the voltage adjustment signal is sent into the half-bridge standard
Shake circuit；The Half Bridge Quasi Resonant circuit is used for the power supply that each region in the backlight is adjusted according to the voltage adjustment signal
Voltage.By using above-mentioned technical proposal, it may be such that the brightness of backlight is adjusted in real time according to the content of screen display.
, can due to replacing multiple DC-DC modules to adjust the supply voltage of backlight using the feedback circuit in Half Bridge Quasi Resonant circuit
Material Cost is saved, while also can reach the effect for reducing display terminal energy consumption.
Embodiment two
Fig. 4 is a kind of structured flowchart of the control circuit for backlight that the utility model the present embodiment two provides.This implementation
Example is refined on the basis of above-described embodiment, as shown in figure 4, the control circuit of the backlight includes：Filter circuit
210th, circuit of power factor correction 220, microcontroller chip 230, backlight driving chip 240, Half Bridge Quasi Resonant circuit 250 and backlight
260.Wherein,
The input of the filter circuit 210 is connected with power network, output end and the phase of circuit of power factor correction 220
Even, for filtering out the electromagnetic interference signal in the control circuit；The output end of the circuit of power factor correction 220 with it is described
The input of Half Bridge Quasi Resonant circuit 250 is connected, for carrying out PFC and adjustment to filtered voltage signal, with
Improve the power factor of the control circuit.The backlight driving chip 240 respectively with the microcontroller chip 230, backlight 260
Connected with Half Bridge Quasi Resonant circuit 250, the Half Bridge Quasi Resonant circuit 250 is also connected with the backlight 260.
Wherein, the backlight driving chip 240, the backlight control signal sent for obtaining the microcontroller chip 230, root
According to the backlight control signal and the driving current by detecting backlight, electricity corresponding with each region in the backlight is produced
Pressure adjustment signal, and the voltage adjustment signal is sent to the Half Bridge Quasi Resonant circuit 250；The Half Bridge Quasi Resonant circuit
250, it is connected with the backlight driving chip 240, for obtaining the voltage adjustment signal, and according to the voltage adjustment signal
Adjust the supply voltage of the backlight region；The backlight 260, it is connected with the Half Bridge Quasi Resonant circuit 250, for root
The brightness of the backlight region is adjusted according to the supply voltage.
Exemplary, filter circuit 210 is preferably EMC (Electro Magnetic Compatibility, electromagnetic compatibility
Property) filter circuit.
Further, the control circuit of backlight also includes the first diode D1 and the second diode D2, wherein, such as Fig. 3
Shown, the anode of the first diode D1 is connected with the negative electrode of the second diode D2；The moon of the first diode D1
Pole is connected with the feedback pin FB of the backlight driving chip 240；The anode of the second diode D2 and the half-bridge standard are humorous
The feedback circuit of circuit 250 of shaking is connected.
Exemplary, the first diode D1 and the second diode D2 serve isolation electric current in the control circuit of backlight
Effect, you can the backlight driving chip of annexation be present with it to cause the electric current of different backlight regions all to flow to, and
The phenomenon that mutual sink current will not be produced occurs, and then multiple backlight driving chips can be allowd simultaneously used in parallel.
Further, backlight driving chip 240 also can according to microcontroller chip 230 send backlight control signal modulate with
Distinct pulse widths adjustment signal (Pulse Width Modulation, PWM) corresponding to different backlight regions.If some backlight
When the real work electric current in region is more than corresponding pre-set current value, reduced and the backlight source region by backlight driving chip 240
The dutycycle of pulse-width adjustment signal corresponding to domain, the real work electric current of the backlight area can be reduced, for display picture
Speech, the brightness of display are dimmed.Accordingly, to cause the lightness variable of display picture, then can be increased by Half Bridge Quasi Resonant circuit
The supply voltage of big corresponding backlight region.
In summary, the control circuit of the backlight provided by using the utility model embodiment, backlight can roots
The pulse-width adjustment signal that the supply voltage and backlight driving chip sent according to Half Bridge Quasi Resonant circuit is sent is combined to adjust the back of the body
The brightness of source region, and then the brightness of backlight region can be caused to change with the change of the brightness of display picture
Become so that the brightness value in the region become clear in display picture can reach maximum, while the brightness of dark area is preferably minimized, very
To closing, and then optimal contrast is can reach, realize the effect of local backlight (Local Dimming) regulation.
Further, the control circuit also includes：Overvoltage crowbar (OVP), with the Half Bridge Quasi Resonant circuit phase
Even, during maximum for reaching predeterminated voltage when the supply voltage, the Half Bridge Quasi Resonant circuit breaker is controlled.
A kind of control circuit of backlight is present embodiments provided, cost is reduced in realization and reaches regulation part exactly
On the basis of backlight effect, isolating diode D1 and D2, EMC filter circuit and circuit of power factor correction are added.By every
From diode, it can make it that multiple backlight driving chips are used in parallel, improve the utilization rate of backlight driving chip；Pass through EMC
Filter circuit can filter out the electromagnetic interference signal in backlight control circuit, by circuit of power factor correction, improve half
The power factor of bridge quasi-resonance circuit, further increase the operating efficiency of backlight control circuit.
Pay attention to, above are only preferred embodiment of the present utility model and institute's application technology principle.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, can carried out for a person skilled in the art various bright
Aobvious change, readjust and substitute without departing from the scope of protection of the utility model.Therefore, although passing through above example
The utility model is described in further detail, but the utility model is not limited only to above example, is not departing from
In the case that the utility model is conceived, other more equivalent embodiments can also be included, and the scope of the utility model is by appended
Right determine.
Claims (7)
1. a kind of control circuit of backlight, applied in display terminal, the display terminal has backlight, and its feature exists
In the control circuit includes：Microcontroller chip, backlight driving chip and Half Bridge Quasi Resonant circuit, the backlight driving chip point
Be not connected with the microcontroller chip, backlight and Half Bridge Quasi Resonant circuit, the Half Bridge Quasi Resonant circuit also with the backlight
Connection, wherein,
The backlight driving chip is used to receive the backlight control signal that the microcontroller chip is sent, and is believed according to the backlight control
Number and by detecting the driving current of backlight, produce voltage adjustment signal corresponding with each region in the backlight, and general
The voltage adjustment signal is sent to the Half Bridge Quasi Resonant circuit；
The Half Bridge Quasi Resonant circuit is used for the power supply electricity that each region in the backlight is adjusted according to the voltage adjustment signal
Pressure.
2. circuit according to claim 1, it is characterised in that the control circuit also includes：First diode and second
Diode, wherein,
The anode of first diode is connected with the negative electrode of second diode；
The negative electrode of first diode is connected with the feedback pin of the backlight driving chip；
The anode of second diode is connected with the Half Bridge Quasi Resonant circuit.
3. circuit according to claim 1, it is characterised in that the control circuit also includes：Filter circuit and power because
Number correcting circuit, wherein,
The input of the filter circuit is connected with power network, and output end is connected with the circuit of power factor correction, for filtering out
Electromagnetic interference signal in the control circuit；
The output end of the circuit of power factor correction is connected with the input of the Half Bridge Quasi Resonant circuit, after to filtering
Voltage signal carry out PFC and adjustment, to improve the power factor of the control circuit.
4. circuit according to claim 3, it is characterised in that the control circuit also includes：
Overvoltage crowbar, it is connected with the Half Bridge Quasi Resonant circuit, for reaching predeterminated voltage most when the supply voltage
During big value, the Half Bridge Quasi Resonant circuit breaker is controlled.
5. circuit according to claim 1, it is characterised in that：
The microcontroller chip is MSP430G series.
6. circuit according to claim 1, it is characterised in that：
The model IW7027 of the backlight driving chip.
7. a kind of display terminal, including backlight, it is characterised in that the display terminal also comprises at least such as claim 1-6
The control circuit of any described backlight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720446586.3U CN206864163U (en) | 2017-04-26 | 2017-04-26 | The control circuit and display terminal of a kind of backlight |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720446586.3U CN206864163U (en) | 2017-04-26 | 2017-04-26 | The control circuit and display terminal of a kind of backlight |
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| Publication Number | Publication Date |
|---|---|
| CN206864163U true CN206864163U (en) | 2018-01-09 |
Family
ID=60822148
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| CN201720446586.3U Active CN206864163U (en) | 2017-04-26 | 2017-04-26 | The control circuit and display terminal of a kind of backlight |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113223466A (en) * | 2021-04-27 | 2021-08-06 | 广东小天才科技有限公司 | Display screen brightness correction method and device and electronic equipment |
| CN114023273A (en) * | 2021-11-22 | 2022-02-08 | 深圳创维－Rgb电子有限公司 | Local dimming driving circuit, method and system and electronic equipment |
-
2017
- 2017-04-26 CN CN201720446586.3U patent/CN206864163U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113223466A (en) * | 2021-04-27 | 2021-08-06 | 广东小天才科技有限公司 | Display screen brightness correction method and device and electronic equipment |
| CN113223466B (en) * | 2021-04-27 | 2022-05-17 | 广东小天才科技有限公司 | Display screen brightness correction method and device and electronic equipment |
| CN114023273A (en) * | 2021-11-22 | 2022-02-08 | 深圳创维－Rgb电子有限公司 | Local dimming driving circuit, method and system and electronic equipment |
| CN114023273B (en) * | 2021-11-22 | 2023-03-21 | 深圳创维－Rgb电子有限公司 | Local dimming driving circuit, method and system and electronic equipment |
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