CN104332140A - Backlight driving system for regional dimming and regional dimming method - Google Patents
Backlight driving system for regional dimming and regional dimming method Download PDFInfo
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Abstract
The invention discloses a backlight driving system for regional dimming and a regional dimming method. The backlight driving system for regional dimming comprises an MCU (Microprogrammed Control Unit) control module, at least one constant-current driving module and at least one DC-CD (Direct Current- Direct Current) module. The MCU control module processes dimming control signals sent by a master control chip and then sends the processed dimming control signals to the at least one constant-current driving module, and the at least one constant-current driving module divides backlight LEDs into a plurality of areas and controls on and off of LEDs in the corresponding areas according to the dimming control signals processed by the MCU control module. Therefore the backlight brightness of the corresponding areas can be dynamically adjusted according to the brightness content of display pictures, the bright fields of the display pictures are brighter, the dark fields of the display pictures are darker, the sense of picture depth is obvious, the display effect such as the picture quality and the contrast ratio are obviously improved, the visual perception is also improved, and energy consumption of display equipment is reduced as backlight sources of the dark filed areas are closed.
Description
Technical field
The present invention relates to display technique field, particularly a kind of backlight driving system for local dimming and local dimming method.
Background technology
Liquid crystal display (as liquid crystal TV set, liquid crystal display apparatus for computer etc.), as the just unexpected new new product risen in recent years, replaces the CRT(Cathode Ray Tube of heaviness, cathode-ray tube (CRT) comprehensively) display becomes the display device of main flow.
Because liquid crystal itself can not be luminous, so LCD(Liquid Crystal Display, liquid crystal display) panel is passive luminophor, it rearward face backlight come luminous, due to LED(light emitting diode, light emitting diode) to have volume little for backlight, and luminescence efficiency is high, array mode is flexible, so be widely used on liquid crystal flat-plate television.
At present, the backlight set-up mode of liquid crystal display is generally two kinds: a kind of mode is side entering type, this kind of mode be LED backlight is placed on liquid crystal panel up and down or both sides; Another kind of mode is straight-down negative, and LED backlight is evenly placed on the back side of liquid crystal panel by this kind of mode.Two kinds of modes respectively have relative merits, obtain different application in the industry.But can only overall variation when the light modulation of these two kinds of conventional schemes and scene changes, in the details in a play not acted out on stage, but told through dialogues region of image, also just screen has closed, and backlight also, in normal work, causes dark scape image whiten, have impact on visual contrast, and not energy-conservation.
Thus prior art need to improve.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, the object of the present invention is to provide a kind of backlight driving system for local dimming and local dimming method, to solve in existing light regulating technology, only turn off liquid crystal molecule according to dark field signal, and backlight is also in normal work, cause dark scape image to whiten, have impact on the problem of the contrast of image.
In order to achieve the above object, this invention takes following technical scheme:
For a backlight driving system for local dimming, comprising: MCU control module, at least one constant-current driven module and at least one DC-DC module,
Described MCU control module, the dimming control signal that the main control chip for receiving display device exports, and dimming control signal is carried out process send to constant-current driven module;
Described constant-current driven module, for backlight LED is divided into several regions, and controls the light on and off of the LED of respective regions according to the dimming control signal after described MCU control module process;
Described DC-DC module, the voltage transitions for being exported by constant-current driven module is that LED lights required driving voltage.
Described in the backlight driving system of local dimming, described MCU control module, specifically for receiving the dimming control signal that described main control chip exports, the data dimmed according to each region in the frequency of the field sync signal of described dimming control signal and dimming control signal, upgrade the value of the register of constant-current driven module.
Described in the backlight driving system of local dimming, described MCU control module, also for carrying out phase shifting control to DC-DC module.
Described in the backlight driving system of local dimming, when phase shifting control, described MCU control module specifically for, when the BL_ON signal detecting main control chip output is high level, after initialization MCU control module, enable EN_BUCK1 signal is high level, after time delay first Preset Time, enable EN_BUCK2 signal is high level, and after time delay second Preset Time, enable EN_7025 signal is high level; When detecting BL_ON signal that main control chip exports and being low level, being low level by EN_7025 signal setting, is low level by EN_BUCK1 signal and EN_BUCK2 signal setting after time delay the 3rd Preset Time.
The described backlight driving system for local dimming, also comprises detection of power loss module, for detecting the supply voltage of MCU control module; Described MCU control module also for, when supply voltage is lower than preset value, the register of initialization constant-current driven module.
Described in the backlight driving system of local dimming, described constant-current driven module is two or more, and each constant-current driven module adopts chrysanthemum link, and each constant-current driven module uses a synchronous clock frequency signal.
Described in the backlight driving system of local dimming, described DC-DC module is more than four, and every two DC-DC module connect a constant-current driven module.
Adopt a local dimming method for the above-mentioned backlight driving system for local dimming, comprise the steps:
When detecting main control chip output enable signal by MCU control module, initialization constant-current driven module, and the dimming control signal receiving main control chip transmission;
When the data layout of the dimming control signal that main control chip sends meets the requirements, obtain the frequency of current field synchronizing signal, the register of initialization constant-current driven module;
Constant-current driven module is sent to after the dimming control signal of main control chip transmission is processed;
By constant-current driven module, backlight LED is divided into several regions, and controls the light on and off of the LED of respective regions according to the dimming control signal after described MCU control module process.
In described local dimming method, describedly by constant-current driven module, backlight LED is divided into several regions, and the step controlling the light on and off of the LED of respective regions according to the dimming control signal after described MCU control module process also comprises: phase shifting control is carried out to DC-DC module.
In described local dimming method, described when detecting main control chip output enable signal by MCU control module, initialization constant-current driven module, and receive the step of data that main control chip sends and also comprise:
Detection of power loss module detects MCU control module and detects its supply voltage;
When supply voltage is lower than preset value, the register of MCU control module initialization constant-current driven module.
Compared to prior art, backlight driving system for local dimming provided by the invention and local dimming method, constant-current driven module is sent to after the dimming control signal that main control chip sends being processed by MCU control module, by constant-current driven module, backlight LED is divided into several regions, and the light on and off of the LED of respective regions are controlled according to the dimming control signal after described MCU control module process, thus achieve according to display frame brightness content, dynamic conditioning corresponding region backlight illumination, the bright field that can embody display drawing is brighter, details in a play not acted out on stage, but told through dialogues is darker, make image level sense obvious, to image quality, the display effects such as contrast obviously promote, improve visual experience, and the backlight of closing details in a play not acted out on stage, but told through dialogues region also reduces the energy consumption of display device.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the present invention for the preferred embodiment of the backlight driving system of local dimming;
Fig. 2 is the signal flow schematic diagram of the present invention for the backlight driving system of local dimming;
Fig. 3 is the present invention for MCU control module in the backlight driving system of local dimming as from SIP communication protocol sequential chart during machine;
Fig. 4 be the present invention for MCU control module in the backlight driving system of local dimming as SIP communication protocol sequential chart during main frame;
Fig. 5 is the concrete sequential chart that the signal in Fig. 4 dotted rectangle amplifies;
Fig. 6 the present invention is used for the circuit diagram of detection of power loss module in the backlight driving system of local dimming;
Fig. 7 is the process flow diagram of the local dimming method of backlight driving system of the present invention.
Embodiment
The invention provides a kind of backlight driving system for local dimming and local dimming method, solve current liquid crystal display backlight power greatly, not energy-conservation, and the contrast of image is bad, namely when dark field signal appears in image, corresponding backlight can not be turned off, when making details in a play not acted out on stage, but told through dialogues, only by liquid crystal display, the liquid crystal molecule shielded in body is turned off, and causes details in a play not acted out on stage, but told through dialogues and stereovision well not to show.
The present invention is according to picture brightness content, dynamic conditioning corresponding region backlight illumination, compared with conventional display apparatus, the energy consumption of more than 20% can be saved, in Image texture effect, bright field can be embodied brighter, details in a play not acted out on stage, but told through dialogues is darker, image level sense is obvious, to image quality, the display effects such as contrast obviously promote, ghost can be reduced simultaneously, promote visual experience, its image effect can match in excellence or beauty and OLED(Organic Light-Emitting Diode, Organic Light Emitting Diode is also called Organic Electricity laser display), LED leakage problem can also be solved simultaneously, extend LED serviceable life.And the present invention adopts fixing communication protocol, MCU control module 10 adopts C language to programme, and its platform transplantation is strong, Mainstream Platform on market of can arranging in pairs or groups, compatible strong.
For making object of the present invention, technical scheme and effect clearly, clearly, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Refer to Fig. 1, it is used for the structured flowchart of the preferred embodiment of the backlight driving system of local dimming for the present invention.As shown in Figure 1, backlight driving system of the present invention comprises: MCU(Micro Controller Unit, micro-control unit) control module 10, at least one constant-current driven module 20 and at least one DC-DC module 30.The main control chip 50 of display device connects MCU control module 10, constant-current driven module 20 and DC-DC module 30, and described constant-current driven module 20 connects DC-DC module 30.
The input end of described MCU control module 10 connects main control chip 50, the dim signal output terminal of MCU control module 10 connects constant-current driven module 20, for the dimming control signal that the main control chip 50 receiving display device exports, and dimming control signal is carried out process send to constant-current driven module 20.
During concrete enforcement, the dimming control signal that described MCU control module 10 exports specifically for the main control chip 50 receiving display device, the data dimmed according to each region in the frequency of the field sync signal of dimming control signal and dimming control signal, upgrade the value of the register of constant-current driven module 20, thus make constant-current driven module 20 according to picture dark field signal, the LED-backlit of respective regions can be turned off.
Each constant-current driven module 20 connects several LED backlight and at least one DC-DC module 30, for backlight LED is divided into several regions, and controls the light on and off of the LED of respective regions according to the dimming control signal after described MCU control module 10 process.Described DC-DC module 30 is that LED lights required driving voltage for the voltage transitions exported by constant-current driven module 20.
Wherein, described MCU control module 10 can adopt MCU chip, constant-current driven module 20 adopts constant-current driven chip, MCU control module 10 links bridge as main control chip 50 with constant-current driven chip, a communication protocol (as SPI communication protocol) is set with main control chip 50, the present embodiment writes the control program of MCU control module 10 according to SPI communication protocol, that it is sent by main control chip 50 and field synchronization, or refresh data continuous with the signal of field sync signal frequency multiplication, the dimming control signal that main control chip 50 sends is accepted by MCU control chip, MCU control chip controls constant-current driven chip according to dimming control signal again and goes to drive corresponding backlight district.
In the embodiment of the present invention, described constant-current driven module 20 is two or more, and each constant-current driven module 20 adopts chrysanthemum to link, and each constant-current driven module 20 uses a synchronous clock frequency signal.And described DC-DC module 30 is more than four, every two DC-DC module 30 connect a constant-current driven module 20.
See also Fig. 2, it is used for the signal flow schematic diagram of the backlight driving system of local dimming for the present invention.In Fig. 2, Vsync represents field sync signal; EN represents enable signal; CSB represents chip selection signal; SCK represents data clock signal; MOSI represents that main control chip 50 sends data and inputs data from MCU chip; MISO represents that main control chip 50 inputs data, exports data from MCU chip; Fault all represents all disablement signal; The synchronous clock of CLKIN indication lamp district constant-current driven chip; DC-DC represents direct current transducer (i.e. DC-DC module 30); LED1-8 represents that the 1st LED district is to 8 LED districts; LED9-16 represents that the 9th LED district is to 16 LED districts.The sequence number of each module of numeral below constant-current driven module and DC-DC.
Take display device as liquid crystal TV set be example, backlight LED can be divided into multiple regions module according to LCD TV backlight modular construction by the present invention, and each constant-current driven chip can control separately 16 Ge Deng districts, 1 to 16 region can be selected as the case may be, each constant current drives and viewing area situation is equipped with one or two DC-DC module 30, again according to whole backlight lamp district quantity, multiple constant-current driven chip is got up by the link of chrysanthemum on-link mode (OLM).Chrysanthemum on-link mode (OLM) is: data are inputted by previous constant-current driven module 20, a rear constant-current driven module 20 is transferred data to by this constant-current driven module 20, and first constant-current driven module 20 receives the data that main control chip 50 sends, data are returned to main control chip 50 by last constant-current driven module 20, form head and the tail and connect.Namely data-signal is inputted by first constant-current driven chip, then by first constant-current driven chip, data are exported to second constant-current driven chip, the 3rd constant-current driven chip is exported to again by second constant-current driven chip, the rest may be inferred, and by last constant-current driven chip, data are flowed to main control chip 50, form the transmission that end to end mode completes whole data.Like this for different regions, increase and decrease constant-current driven chip is very convenient, and extendability is strong.
During concrete enforcement, MCU control module 10 uses C language to programme, and can use different main control chip 50 platforms by MC chip controls, and it can standardized designs, and transplantability is strong.The present invention first defines a communication protocol by MCU chip and main control chip 50, this communication protocol as MCU chip and main control chip 50(MCU from machine) and the communication benchmark of constant-current driven chip (MCU main frame).Constant-current driven chip again because adopting chrysanthemum to link needs a synchronous clock frequency, this clock frequency by main control chip 50 according to data volume size, export a fixed duty cycle, using the clock frequency of fixed frequency as the synchronizing frequency of constant-current driven chip, MCU chip receives by communication protocol definition the signal that main control chip 50 sends, dissection process is carried out to data, then is transferred to constant-current driven chip, finally complete Region control.
As shown in Figure 3-Figure 5, wherein, Fig. 3 is the present invention for MCU control module 10 in the backlight driving system of local dimming as from SIP communication protocol sequential chart during machine; Fig. 4 be the present invention for MCU control module 10 in the backlight driving system of local dimming as SIP communication protocol sequential chart during main frame; Fig. 5 is the concrete sequential chart that the signal in Fig. 4 dotted rectangle amplifies.
In Fig. 3-Fig. 5, MCU control module 10, as when receiving data from machine, need receive the data of a packet, as shown in Figure 3 within a VSYNC signal period; When MCU control module 10 sends data as main frame, also the data of a packet need be sent within a VSYNC signal period, shown in from Fig. 3 to Fig. 5, free setting be according to a field signal time (Vsync vertical interval), arrange according to lamp bar Region dividing, in a field signal cycle domestic demand by complete for all signal transacting.Wherein, T1 represents: after MCU control module 10 detects field signal Vsync, starts clocking again and send data after needing time delay regular hour T1.T2 represents: as the case may be with selected MCU chip and lamp bar region to set clock frequency, namely T2 represents the cycle of clock signal.T3 represents: be the positive dutycycle producing clock frequency, need be less than frequency cycle time.The time that T4 represents need carry out setting-up time according to Vsync and T2.The time that T5 represents need set according to the stability of Vsync and all data processing times and work wave.T6 represents: SPI mode of operation, and when SCLK is in low level, the data-signal that need send gets out the time.T7 represents: the sampling retention time when SCLK rises to high level, and a period of time between T6 and T7 is data sampling time.
In MCU control module 10, SDI data are defined as follows shown in table:
The present invention adopts communication protocol, the dimming control signal that main control chip 50 sends over is accepted by MCU chip, MCU chip controls constant-current driven chip after being processed by dimming control signal again, and each constant-current driven chip adopts previous data to be transferred to latter one drives the chrysanthemum on-link mode (OLM) of constant current chip, the demand of LED LCD backlight TV in different size, different lamp district can be met.
Preferably, the present invention also carries out phase shifting control by MCU control module 10 pairs of DC-DC module 30, solves the drawback that when backlight starts, dash current is large.When phase shifting control, described MCU control module 10 specifically for, when the BL_ON signal detecting main control chip 50 output is high level, after initialization MCU control module 10, enable EN_BUCK1 signal is high level, after time delay first Preset Time, enable EN_BUCK2 signal is high level, and after time delay second Preset Time, enable EN_7025 signal is high level; When detecting BL_ON signal that main control chip 50 exports and being low level, being low level by EN_7025 signal setting, is low level by EN_BUCK1 signal and EN_BUCK2 signal setting after time delay the 3rd Preset Time.Wherein, the first Preset Time is 1ms, and the second Preset Time is 30ms, and the 3rd Preset Time is 5ms.Wherein, BL-ON signal is the enable level that main control chip exports to MCU control module 10, as the EN signal in Fig. 2.EN_BUCK1 signal, EN_BUCK2 signal are the enable level that MCU control module 10 exports to DC-DC module, DC-EBA1 and DC-EBA2 respectively in corresponding diagram 2, EN_BUCK2 signal has the regular hour poor compared with EN_BUCK1 signal simultaneously.EN_7025 signal is the enable level that MCU control module 10 exports to constant-current driven module, as the EN1 in Fig. 2.
Cause the problem of system sequence disorder to power on suddenly after preventing display device power down, the backlight driving system for local dimming of the present invention also comprises detection of power loss module 40, for detecting the supply voltage of MCU control module 10; Described MCU control module also for when supply voltage is lower than preset value, the register of initialization constant-current driven module 20.Described MCU control module 10 detects its supply voltage level by peripheral down circuit, the problem that when solving the continuous switching on and shutting down of current display device, software can not respond.
As shown in Figure 6, described detection of power loss module 40 comprises the first resistance R1, the second resistance R2 and electric capacity C1, one end of described first resistance R1 connects and connects main control chip 50 by the power module 60 of display device, and the other end of described first resistance R1 connects MCU control module 10, also passes through the second resistance R2 ground connection, also by electric capacity C1 ground connection.
Because the supply voltage of constant-current driven module 20 and DC-DC module 30 provides by the VIN in Fig. 6, and the supply voltage of MCU control module 10 need be generally 12V by VIN() be depressurized to 3.3V, in the process of continuous switching on and shutting down, the voltage of VIN can fall down, along with the voltage drop of VIN, the voltage of A point also declines, when after VIN voltage drop to certain level, DC-DC module 30 and constant-current driven module 20 all can quit work, but MCU control module 10 voltage can postpone to decline, if MCU control module 10 is also working on, if now give system electrification suddenly, the sequential of whole system will be disorderly, system is caused normally to work.
In order to solve the problem, the present invention passes through detection of power loss function, when MCU detection voltage drops to 2.0V, and the register of initialization constant-current driven module 20, when system fast powering-up time, the brightness of constant-current driven module 20 ability normal work refreshing lamp bar; Otherwise constant-current driven module 20 cisco unity malfunction, causes lamp bar point not work, ensure that when VIN voltage drop to certain voltage power on again suddenly again time, whole system also can normally work.
The present invention is also corresponding provides a kind of local dimming method adopting the above-mentioned backlight driving system for local dimming, and refer to Fig. 7, described local dimming method comprises the steps:
S100, by MCU control module detect main control chip output enable signal time, initialization constant-current driven module, and receive main control chip send dimming control signal;
S200, when the data layout of dimming control signal that main control chip sends meets the requirements, obtain the frequency of current field synchronizing signal, the register of initialization constant-current driven module;
S300, to main control chip send dimming control signal process after send to constant-current driven module;
S400, by constant-current driven module, backlight LED is divided into several regions, and controls the light on and off of the LED of respective regions according to the dimming control signal after described MCU control module process.
In the step s 100, detect main control chip by MCU control module and whether export high level, in order to strict control system electrifying timing sequence, MCU control module initialization after energising, initialization waits for that main control chip sends EN signal later, when EN signal is high level, and initialization constant-current driven module.Because the power down of 12V supply voltage causes the situation of system sequence disorder when so just can solve continuous switching on and shutting down.The specific code while loop statement of MCU control module realizes.When MCU controls to detect its P2.1 pin (an I/O mouth of MCU chip) for low level, just wait in while loop statement, until when P2.1 pin is high level, program will be jumped out while loop statement and down perform always.
Therefore, the present invention also comprises between step S100 and S200, and detection of power loss module detects MCU control module and detects its supply voltage; When supply voltage is lower than preset value, the register of MCU control module initialization constant-current driven module.MCU control module is by detection of power loss function, and when guaranteeing to power on suddenly when supply voltage drops to certain voltage, whole system also can normally work again, and because detection of power loss function has been described in detail above, repeats no more herein.
After carrying out detection of power loss, step S200 detects main control chip transmission data by MCU control module can be entered.When MCU control module by the data that receive stored in array, then resolution data, judge whether the data inside array meet communication protocol requirements, if met the requirements, then judge that the frequency of field sync signal is 50HZ or 100HZ(frequency multiplication) or 60HZ or 120HZ.Register value corresponding to constant-current driven module is upgraded for different field sync signal frequencies, the Local Dimming(local dimming in each district owing to receiving) data are 1 byte(byte), the brightness value of each passage of corresponding constant-current driven module is 2 byte, need to carry out data conversion according to the databook of constant-current driven module, extract the Local dimming data in each district inside array, these data are converted to the register value of corresponding each constant-current driven module.And then according to the SPI communication protocol of daisy chain, successively brightness value is write to all passages of each constant-current driven module, finally realize the brightness controlling corresponding lamp bar.
Wherein, send especially by the data judging to receive and main control chip when judging that the data layout of dimming control signal meets the requirements whether the quantity of the data head of data, data tail and data is identical judges.When receiving VSYNC signal, first MCU control module confirms cycle and the pulsewidth of VSYNC signal, because MCU chip has special PWM to export I/O port, only needs the cycle to become corresponding register value just can export VSYNC signal with pulse width conversion.
Further, described step S400 also comprises and carries out phase shifting control to DC-DC module.When the BL_ON signal of main control chip is high level time, MCU control module starts initialization, enable EN_BUCK1 is high level successively respectively, this time of time delay 1ms(determines according to the quantity of setting, by one-period according to the phase settings time) after more enable EN_BUCK2 be high level, after time delay 30ms, enable EN_7025 is high level again, when system standby, backlight will be turned off at once, just first EN_7025 is set to low level, time delay 5ms, then EN_BUCK1, EN_BUCK2 sets gradually as low level, such when can prevent backlight from starting dash current excessive, damage power panel.
In sum, the present invention sends to constant-current driven module after being processed the dimming control signal that main control chip sends by MCU control module, by constant-current driven module, backlight LED is divided into several regions, and the light on and off of the LED of respective regions are controlled according to the dimming control signal after described MCU control module process, thus achieve according to display frame brightness content, dynamic conditioning corresponding region backlight illumination, the bright field that can embody display drawing is brighter, details in a play not acted out on stage, but told through dialogues is darker, make image level sense obvious, to image quality, the display effects such as contrast obviously promote, improve visual experience, and the backlight of closing details in a play not acted out on stage, but told through dialogues region also reduces the energy consumption of display device.
The present invention adopts MCU control module as the bridge of main control chip and constant-current driven module, and MCU control module programming adopts C language, and has surely discussed communication protocol benchmark with main control chip, and this agreement kinds of platform of can arranging in pairs or groups uses, and is convenient to standardized designs.Constant-current driven module bridge joint mode adopts chrysanthemum to link, the data that the data of previous constant-current driven module export as a rear constant-current driven module input, form end to end on-link mode (OLM) with main control chip, be convenient to the increase and decrease in lamp bar region like this, be easy to expansion.
In addition, the present invention is directed to DC Module and carry out phase shifting control, this phase shifting control can export quantity according to the I/O port of MCU control module, carries out accurate phase shifting control to DC-DC module, solves the drawback that when backlight starts, dash current is larger.
Be understandable that, for those of ordinary skills, can be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, and all these change or replace the protection domain that all should belong to the claim appended by the present invention.
Claims (10)
1. for a backlight driving system for local dimming, it is characterized in that, comprising: MCU control module, at least one constant-current driven module and at least one DC-DC module,
Described MCU control module, the dimming control signal that the main control chip for receiving display device exports, and dimming control signal is carried out process send to constant-current driven module;
Described constant-current driven module, for backlight LED is divided into several regions, and controls the light on and off of the LED of respective regions according to the dimming control signal after described MCU control module process;
Described DC-DC module, the voltage transitions for being exported by constant-current driven module is that LED lights required driving voltage.
2. the backlight driving system for local dimming according to claim 1, it is characterized in that, described MCU control module, specifically for receiving the dimming control signal that described main control chip exports, the data dimmed according to each region in the frequency of the field sync signal of described dimming control signal and dimming control signal, upgrade the value of the register of constant-current driven module.
3. the backlight driving system for local dimming according to claim 1, is characterized in that, described MCU control module, also for carrying out phase shifting control to DC-DC module.
4. the backlight driving system for local dimming according to claim 3, it is characterized in that, when phase shifting control, described MCU control module specifically for, when the BL_ON signal detecting main control chip output is high level, after initialization MCU control module, enable EN_BUCK1 signal is high level, and after time delay first Preset Time, enable EN_BUCK2 signal is high level, and after time delay second Preset Time, enable EN_7025 signal is high level; When detecting BL_ON signal that main control chip exports and being low level, being low level by EN_7025 signal setting, is low level by EN_BUCK1 signal and EN_BUCK2 signal setting after time delay the 3rd Preset Time.
5. the backlight driving system for local dimming according to claim 1, is characterized in that, also comprises detection of power loss module, for detecting the supply voltage of MCU control module; Described MCU control module also for when supply voltage is lower than preset value, the register of initialization constant-current driven module.
6. the backlight driving system for local dimming according to claim 1-5 any one, it is characterized in that, described constant-current driven module is two or more, and each constant-current driven module adopts chrysanthemum link, and each constant-current driven module uses a synchronous clock frequency signal.
7. the backlight driving system for local dimming according to claim 6, is characterized in that, described DC-DC module is more than four, and every two DC-DC module connect a constant-current driven module.
8. adopt a local dimming method for the backlight driving system for local dimming according to claim 1, it is characterized in that, comprise the steps:
When detecting main control chip output enable signal by MCU control module, initialization constant-current driven module, and the dimming control signal receiving main control chip transmission;
When the data layout of the dimming control signal that main control chip sends meets the requirements, obtain the frequency of current field synchronizing signal, the register of initialization constant-current driven module;
Constant-current driven module is sent to after the dimming control signal of main control chip transmission is processed;
By constant-current driven module, backlight LED is divided into several regions, and controls the light on and off of the LED of respective regions according to the dimming control signal after described MCU control module process.
9. local dimming method according to claim 8, it is characterized in that, describedly by constant-current driven module, backlight LED is divided into several regions, and the step controlling the light on and off of the LED of respective regions according to the dimming control signal after described MCU control module process also comprises: phase shifting control is carried out to DC-DC module.
10. local dimming method according to claim 8, is characterized in that, described when detecting main control chip output enable signal by MCU control module, initialization constant-current driven module, and receives the step of data that main control chip sends and also comprise:
Detection of power loss module detects MCU control module and detects its supply voltage;
When supply voltage is lower than preset value, the register of MCU control module initialization constant-current driven module.
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| CN104735874A (en) * | 2015-03-20 | 2015-06-24 | 彭云 | Lamp and dimming method thereof |
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| CN105960078A (en) * | 2016-06-28 | 2016-09-21 | 欧普照明股份有限公司 | Method and device for controlling state of light source based on microprocessor |
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| WO2020056872A1 (en) * | 2018-09-21 | 2020-03-26 | 深圳创维－Rgb电子有限公司 | Dimming control system and dimming control method for backlight source, and display device |
| 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 |
| CN109068454A (en) * | 2018-10-30 | 2018-12-21 | 无锡恒芯微科技有限公司 | Modified PWM and DIM dimming driving circuit |
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| CN109949753A (en) * | 2019-04-24 | 2019-06-28 | 深圳创维－Rgb电子有限公司 | A kind of power supply unit of backlight |
| CN110277069A (en) * | 2019-06-27 | 2019-09-24 | 青岛海信电器股份有限公司 | A kind of video screen method for controlling backlight thereof, device and TV |
| US11107423B2 (en) | 2019-06-27 | 2021-08-31 | Hisense Visual Technology Co., Ltd. | Method and device for controlling backlight, and display device |
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| WO2021138997A1 (en) * | 2020-01-09 | 2021-07-15 | Tcl华星光电技术有限公司 | Backlight source driven method, backlight source driven circuit, and backlight source driven device |
| CN113053329A (en) * | 2021-03-26 | 2021-06-29 | 深圳前海骁客影像科技设计有限公司 | Backlight control system |
| WO2022226717A1 (en) * | 2021-04-26 | 2022-11-03 | 京东方科技集团股份有限公司 | Backlight data transmission method, micro-control unit and local dimming system |
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