CN105976770B - A kind of method, apparatus and system of control dim signal - Google Patents
A kind of method, apparatus and system of control dim signal Download PDFInfo
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- CN105976770B CN105976770B CN201610578291.1A CN201610578291A CN105976770B CN 105976770 B CN105976770 B CN 105976770B CN 201610578291 A CN201610578291 A CN 201610578291A CN 105976770 B CN105976770 B CN 105976770B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/10—Intensity circuits
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Abstract
The invention discloses a kind of method, apparatus and system of control dim signal.The method includes：MCU obtains the pwm signal data that the luminance signal data that T_con plates are sent is sent with mainboard；The MCU determines the need for adjusting the brightness of current display screen according to the pwm signal data, if it is determined that needing to adjust the brightness of current display screen, the brightness of the display screen after adjustment is then determined according to the luminance signal data and the pwm signal data, this mode can meet different sizes, the demand of the LED LCD backlight TVs in different lamp areas meets the image quality requirement with HDR TVs, solves the hangover of image, ghost, water ripples problem；The contrast and depth of field degree for improving image, improve the visual experience of consumer, push the development of LCD TV；Liquid crystal television LED lamp zonal control is realized, TV consumption power, energy conservation and environmental protection are reduced.
Description
Technical field
The present embodiments relate to LED backlight LCD TV more particularly to a kind of method, apparatus of control dim signal
And system.
Background technology
With the development of smart television, requirement of the consumer to image quality is higher and higher, has high dynamic range images
Requirement higher of the television set of (High-Dynamic Range, HDR) function to image quality, such as the electricity with HDR functions
Ask that the local luminance of image is brighter, darkness is darker depending on confidential, for carrying High Specific Radioactivity.It can be expired using side-light type local dimming backlight
Foot has the television set requirement of HDR functions, and industry side-light type local dimming usually generates area by TV motherboard master chip and moves at present
State region controls dim signal, and then control area light modulation driving constant current plate, the backlight drive that such mode generates control signal
Cannot be synchronous with liquid crystal display luminance signal, especially for the picture signal of the television set with HDR functions, can cause hangover,
The appearance of shadow and water ripples, this mode cannot not only promote the image quality of image, produce harmful effect to image instead.
Invention content
The purpose of the embodiment of the present invention is to propose a kind of method, apparatus and system of control dim signal, it is intended to solve
How the hangover that when HDR image occurs, shadow phenomenon are avoided.
For this purpose, the embodiment of the present invention uses following technical scheme：
In a first aspect, a kind of method of control dim signal, the method includes：
MCU obtains the pwm signal data that the luminance signal data that T_con plates are sent is sent with mainboard, the luminance signal
Data are used to describe the luminance signal in each area of subregion constant current driving device, the luminance signal data and the subregion constant current
The luminance signal of driving device synchronizes；
The MCU determines the need for adjusting the brightness of current display screen according to the pwm signal data, however, it is determined that needs
The brightness of current display screen is adjusted, then determines the display after adjustment according to the luminance signal data and the pwm signal data
The brightness of screen.
Preferably, the MCU obtains the luminance signal data of T_con plates, including：
The MCU obtains the luminance signal data that the T_con plates are sent by SIP communication protocols.
Preferably, the luminance signal data of the MCU acquisitions T_con plates further includes with before pwm signal data：
Initialize the T_con plates, the mainboard and the MCU；
The MCU obtains the luminance signal data of T_con plates with after pwm signal data, further includes：
Judge whether the luminance signal data and the pwm signal data are correct data；If the luminance signal
Data and the pwm signal data are correct data, then execute the MCU and determine whether need according to the pwm signal data
Adjust the brightness of current display screen, however, it is determined that need to adjust the brightness of current display screen, then according to the luminance signal data
The brightness of the display screen after adjustment is determined with the pwm signal data.
Preferably, the MCU determines the need for adjusting the brightness of current display screen according to pwm signal data, however, it is determined that
Need to adjust the brightness of current display screen, then after determining adjustment according to the luminance signal data and the pwm signal data
The brightness of display screen, including：
Concentrated collection is carried out to the pwm signal data and is ranked up from big to small, median is taken, by the median
It is compared with maximum PWM threshold values, minimum PWM threshold values, judges whether the pwm signal data are effective；
If the pwm signal data are effective, effective median in the pwm signal data and a upper period were obtained
The difference of effective median；
If the difference is not more than predetermined deviation value, it is determined that the PWM value maintains the bright of current display screen without adjustment
Degree；
If the difference is more than predetermined deviation value, it is determined that the PWM value has adjustment, after calculating adjustment according to preset formula
Display screen brightness；
Wherein, the preset formula is：In the brightness of display screen after variation=luminance signal data * current periods
Pwm signal data/current period when high level.
Preferably, the MCU determines the need for adjusting the brightness of current display screen according to the pwm signal data, if
It determines the brightness for needing to adjust current display screen, then adjustment is determined according to the luminance signal data and the pwm signal data
After the brightness of display screen afterwards, further include：
Local dimming data in the luminance signal in each area after extraction adjustment, by the Local dimming
Data are converted to the register value of corresponding subregion constant current driving device；
Brightness value is written to the communication of the constant current driving device in each area successively by the SPI communication agreement.
Second aspect, a kind of device of control dim signal, described device include：
Acquisition module, the pwm signal data that the luminance signal data for obtaining the transmission of T_con plates is sent with mainboard, institute
State the luminance signal in each area of the luminance signal data for describing subregion constant current driving device, the luminance signal data and institute
The luminance signal for stating subregion constant current driving device synchronizes；
Determining module, the brightness for determining the need for adjusting current display screen according to the pwm signal data, if really
It needs to adjust the brightness of current display screen calmly, then after determining adjustment according to the luminance signal data and the pwm signal data
Display screen brightness.
Preferably, the acquisition module, is used for：
Obtain the luminance signal data that the T_con plates are sent by SIP communication protocols.
Preferably, described device further includes：
Initialization module is used for before the MCU obtains luminance signal data and the pwm signal data of T_con plates, just
The beginningization T_con, the mainboard and the MCU；
Judgment module, the luminance signal data for obtaining T_con plates in the MCU judge with after pwm signal data
Whether the luminance signal data and the pwm signal data are correct data；If the luminance signal data and the PWM
Signal data is correct data, then executes the determining module.
Preferably, the determining module, is used for：
Concentrated collection is carried out to the pwm signal data and is ranked up from big to small, median is taken, by the median
It is compared with maximum PWM threshold values, minimum PWM threshold values, judges whether the pwm signal data are effective；
If the pwm signal data are effective, effective median in the pwm signal data and a upper period were obtained
The difference of effective median；
If the difference is not more than predetermined deviation value, it is determined that the PWM value maintains the bright of current display screen without adjustment
Degree；
If the difference is more than predetermined deviation value, it is determined that the PWM value has adjustment, after calculating adjustment according to preset formula
Display screen brightness；
Wherein, the preset formula is：In the brightness of display screen after variation=luminance signal data * current periods
Pwm signal data/current period when high level.
Preferably, described device further includes：
Conversion module, for determining the need for adjusting current display screen according to the pwm signal data in the MCU
Brightness, however, it is determined that it needs to adjust the brightness of current display screen, then it is true according to the luminance signal data and the pwm signal data
Set the tone it is whole after display screen brightness after, extraction adjustment after each area luminance signal in Local dimming data,
The Local dimming data are converted to the register value of corresponding subregion constant current driving device；
Writing module, for the communication of the constant current driving device in each area to be written successively by the SPI communication agreement
Brightness value.
The third aspect, a kind of system of control dim signal, it is permanent that the system comprises MCU, T_con plate, mainboard and subregions
Flow driving device；
The MCU, the pwm signal data that the luminance signal data for obtaining the transmission of T_con plates is sent with the mainboard,
The luminance signal data be used for describe subregion constant current driving device each area luminance signal, the luminance signal data with
The luminance signal of the subregion constant current driving device synchronizes；It is current aobvious that adjustment is determined the need for according to the pwm signal data
The brightness of display screen, however, it is determined that need to adjust the brightness of current display screen, then according to the luminance signal data and the pwm signal
Data determine the brightness of the display screen after adjustment；
The T_con plates, for same by field sync signal and the luminance signal data of the subregion constant current driving device
It walks, and sends the luminance signal data of the subregion constant current driving device to the MCU；
The mainboard, for sending pwm signal data to the MCU；
The subregion constant current driving device, the luminance signal in each area after adjustment for receiving the MCU transmissions.
Preferably, multiple constant-current driven chips in the subregion constant current driving device are connected by predetermined manner, described
Predetermined manner is：Data-signal is inputted by first chip, is exported the data-signal to second by first chip
A chip, then exported by second chip and give third chip, and so on, the data are believed by the last one chip
Number output and joins end to end to master chip.
The embodiment of the present invention provides a kind of method, apparatus and system of control dim signal, and MCU obtains T_con plates and sends
The pwm signal data that send of luminance signal data and mainboard；The MCU is determined the need for according to the pwm signal data
Adjust the brightness of current display screen, however, it is determined that need to adjust the brightness of current display screen, then according to the luminance signal data and
The pwm signal data determine that the brightness of the display screen after adjustment, this mode can meet different sizes, the LED in different lamp areas
The demand of LCD backlight TV meets the image quality requirement with HDR TVs, solves the hangover of image, ghost, water ripples
Problem；The contrast and depth of field degree for improving image, improve the visual experience of consumer, push the development of LCD TV；It realizes
Liquid crystal television LED lamp zonal control reduces TV consumption power, energy conservation and environmental protection.
Description of the drawings
Fig. 1 is a kind of flow diagram of the method for control dim signal provided in an embodiment of the present invention；
Fig. 2 is a kind of schematic diagram of the data structure of SIP communication protocols provided in an embodiment of the present invention；
Fig. 3 is a kind of data-signal figure of SIP communications provided in an embodiment of the present invention；
Fig. 4 is a kind of flow diagram of the PWM count provided in an embodiment of the present invention according to the method for operation；
Fig. 5 is the flow diagram of the method for another control dim signal provided in an embodiment of the present invention；
Fig. 6 is the flow diagram of the method for another control dim signal provided in an embodiment of the present invention；
Fig. 7 is a kind of high-level schematic functional block diagram of the device of control dim signal provided in an embodiment of the present invention；
Fig. 8 is a kind of structural schematic diagram of the system of control dim signal provided in an embodiment of the present invention；
Fig. 9 is the structural schematic diagram of the system of another control dim signal provided in an embodiment of the present invention.
Specific implementation mode
The embodiment of the present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this
The described specific embodiment in place is used only for explaining the embodiment of the present invention, rather than the restriction to the embodiment of the present invention.In addition also
It should be noted that illustrating only for ease of description, in attached drawing and the relevant part of the embodiment of the present invention rather than entire infrastructure.
With reference to figure 1, Fig. 1 is a kind of flow diagram of the method for control dim signal provided in an embodiment of the present invention.
As shown in Figure 1, the method for the control dim signal includes：
Step 101, micro-control unit (Microcontroller Unit, MCU) obtains the luminance signal that T_con plates are sent
Data modulate (Pulse Width Modulation, PWM) signal data, the luminance signal with the pulse width that mainboard is sent
Data are used to describe the luminance signal in each area of subregion constant current driving device, the luminance signal data and the subregion constant current
The luminance signal of driving device synchronizes；
Specifically, MCU obtains the luminance signal data and pwm signal data of T_con plates transmission in real time, and from pwm signal
Judge whether to need to adjust the brightness of current display screen in data.For example, if user triggers the brightness of adjustment display screen manually
In the case of, it can need to adjust according to the pwm signal data determination obtained in real time；Or television set is according to the light of ambient enviroment
Etc. in the case that environmental parameters adaptively adjust the brightness of display screen, can determine need according to the pwm signal data obtained in real time
It adjusts.
The image brightness signal of liquid crystal flat-plate television with HDR functions, make liquid crystal molecule in liquid crystal display body rotate with
The LED backlight light source of subregion is bright cannot secretly to be synchronized, and hangover, shadow, water ripples problem occurs in the image for being directed at HDR functions.
Because liquid crystal display itself cannot shine, special backlight is needed to provide light, when details in a play not acted out on stage, but told through dialogues, passes through and change liquid crystal display screen
Internal Liquid Crystal Molecules Alignment blocks light ginseng to pass through, and backlight is working always, and screen image details in a play not acted out on stage, but told through dialogues cannot with stereovision
It shows well.When bright field, by changing the liquid crystal molecule rotation angle in liquid crystal display body, light is made to pass through.With HDR
The TV of function, the backlight region brightness corresponding to bright field part need to be raised it is brighter, then with greater need for the liquid in liquid crystal display body
Brilliant molecule rotation angle sequential is consistent with backlight driver sequential, and it is brighter to embody bright field, while can eliminate ghost.Details in a play not acted out on stage, but told through dialogues portion
Backlight corresponding to part then need to completely close light source, keep image level sense apparent, contrast etc. is obviously improved, image effect
It is significantly improved, promotes visual experience.
LDE backlight constant currents driving is then needed from shielding in body in order to synchronous with the liquid crystal molecule rotation that liquid crystal display screen is internal
T_con (Timing controller) in data taken signal, and using field sync signal as constant current driving switch frequency, reach
To the hangover occurred when solving HDR, shadow, water ripples problem.Because T_con constant current driving control signal does not have backlight overall brightness
Control, and the brightness of TV is set according to liking for consumer, how to solve that LED backlight drive control is taken to believe in T_con
Number without brightness control problem, one PWM of brightness control signal caused by mainboard is introduced.
According to the above situation, T_con data are received by MCU, then receive the pwm signal that mainboard is sent out, spy is passed through by MCU
After fixed operation method, then the LED backlight constant current of control partition is gone to drive.
Preferably, the MCU obtains the luminance signal data of T_con plates, including：
The MCU obtains the T_con luminance signal datas that the T_con is sent according to SIP communication protocols.
Specifically, the format of SIP communication protocols is as follows：
Specifically, being data structure, the signal graph of SIP communication protocols as shown in Figure 2 and Figure 3.
The setting of institute's having time was arranged with lamp bar region division according to the field signal time (Vsync vertical intervals)
, it is in a field signal period domestic demand that all signal processings are complete.
Tc1：To the requirement of Vsync positive pulses；
Tc2：Start to generate clock signal and transmission data again on the basis of Vsync, after the regular hour need to being postponed；
Tc3：It is to set clock frequency with selected MCU and lamp bar region as the case may be；
Tc3：It is set with all data processing times and the stability of work wave according to Vsync；
T4：It need to be set with all data processing times and the stability of work wave according to MCU.
T5：It need to be set with all data processing times and the stability of work wave according to MCU.
Step 102, the MCU determines the need for adjusting the brightness of current display screen according to the pwm signal data, if
It determines the brightness for needing to adjust current display screen, then adjustment is determined according to the luminance signal data and the pwm signal data
The brightness of display screen afterwards.
Preferably, the MCU determines the need for adjusting the brightness of current display screen according to pwm signal data, however, it is determined that
Need to adjust the brightness of current display screen, then after determining adjustment according to the luminance signal data and the pwm signal data
The brightness of display screen, including：
Concentrated collection is carried out to the pwm signal data and is ranked up from big to small, median is taken, by the median
It is compared with maximum PWM threshold values, minimum PWM threshold values, judges whether the pwm signal data are effective；
If the pwm signal data are effective, effective median in the pwm signal data and a upper period were obtained
The difference of effective median；
If the difference is not more than predetermined deviation value, it is determined that the PWM value maintains the bright of current display screen without adjustment
Degree；
If the difference is more than predetermined deviation value, it is determined that the PWM value has adjustment, after calculating adjustment according to preset formula
Display screen brightness；
Wherein, the preset formula is：In the brightness of display screen after variation=luminance signal data * current periods
Pwm signal data/current period when high level.
Specifically, BLK on/off control each module for power supply, is controlled by mainboard master chip, after sending out starting-up signal, opened
Open MCU, subregion constant current driving, DC-DC power switch.
After MCU is powered, MCU is first initialized, then initializes subregion constant current driving, after program initialization, starts to receive T_
The SPI data of con, then parse data, judge whether the data inside array are correct, if correctly, receiving what mainboard was sent out
Pwm signal judges PWM, then carries out mean filter method.
In the control logic of this MCU, the event of processing is operated in a manner of single thread, and completion is executed with some state
Afterwards, it can just go to execute next state, can be closely connected between each state, by way of state switching, it is easy to
It allows MCU to switch between each state, while software developer also can more be allowed clearly to analyze whether some state locally deposits
In bugs.State handover mechanism by the readability of program, portability, become very flexibly.This program from detection SPI data,
Judge SPI data, detection PWM, judge that PWM, data operation have fully used state to switch method.
Wherein, mean filter method refers to concentrated collection being carried out to data, in a series of continuous Data processings with from big
To small data sorting, median is taken in sequence from sequencing, by median with it is maximum, minimum PWM threshold values judge this group of data
Whether effectively, if effectively, taking out effective median in this group of data, then compared with last effective median,
If no more than the deviation of setting, that is, think that this PWM value is unchanged, state of remaining stationary；If it is greater than the deviation of setting, then
Think that this PWM is changed, then the median of this data is assigned to the median of upper one group of data, is carried out with the median
PWM count is according to operation.This method for obtaining mean value, referred to as mean filter method.This programme has fully used this method to examine PWM
Survey is handled, and ensures the validity of Data Detection.The detailed function and function calculation formula of this method be divided to two part, first
Part, PWM mean filter methods, the second part PWM operations.
Specifically, as shown in figure 4, Fig. 4 is a kind of PWM count provided in an embodiment of the present invention shows according to the flow of the method for operation
It is intended to.
As shown in figure 4, the PWM count includes according to the method for operation：
Step 401, the data in array sort from big to small；
Step 402, the intermediate value in sorting data is taken out；
Step 403, judge this data whether in standard；
Step 404, if judging, this data in standard, takes out the intermediate value in sorting data；
Step 405, if judging this data not in standard, status register resets, and waits for data next time；
Step 406, after taking out the intermediate value in sorting data, whether the array mediant that judges to sort is more than a upper number
Group median；
Step 407, it if sequence array mediant is more than upper array median, takes out intermediate data value and subtracts among upper one
Number；
Step 408, if sequence array mediant is not more than upper array median, a upper intermediate data subtracts existing centre
Numerical value；
Step 409, after taking-up intermediate data value subtracts a upper mediant, judge difference whether in thresholding；
Step 410, if not in thresholding, PWM is updated；
Step 411, if in thresholding, PWM count evidence is not updated；
Step 412, status register is updated；
Step 413, PWM operations；
Step 414, status register is updated；
Step 415, data are sent.
The embodiment of the present invention provides a kind of method of control dim signal, and MCU obtains the luminance signal number that T_con plates are sent
According to the pwm signal data sent with mainboard；The MCU determines the need for adjusting current display according to the pwm signal data
The brightness of screen, however, it is determined that need to adjust the brightness of current display screen, then according to the luminance signal data and the pwm signal number
According to the brightness for determining the display screen after adjusting, this mode can meet different sizes, the LED LCD backlight TVs in different lamp areas
Demand meets the image quality requirement with HDR TVs, solves the hangover of image, ghost, water ripples problem；Improve image
Contrast and depth of field degree, improve the visual experience of consumer, push the development of LCD TV；Realize liquid crystal television LED
Lamp zonal control reduces TV consumption power, energy conservation and environmental protection.
With reference to figure 5, Fig. 5 is the flow diagram of the method for another control dim signal provided in an embodiment of the present invention.
As shown in figure 5, the method for the control dim signal includes：
Step 501, the T_con, the mainboard and the MCU are initialized；
Step 502, MCU obtains the pwm signal data that the luminance signal data that T_con plates are sent is sent with mainboard, described
Luminance signal data be used for describe subregion constant current driving device each area luminance signal, the luminance signal data with it is described
The luminance signal of subregion constant current driving device synchronizes；
Step 503, judge whether the luminance signal data and the pwm signal data are correct data；
Step 504, if the luminance signal data and the pwm signal data are correct data, the MCU is executed
Determine the need for adjusting the brightness of current display screen according to the pwm signal data, however, it is determined that need to adjust current display screen
Brightness, then the brightness of the display screen after adjustment is determined according to the luminance signal data and the pwm signal data.
With reference to figure 6, Fig. 6 is the flow diagram of the method for another control dim signal provided in an embodiment of the present invention.
As shown in fig. 6, the method for the control dim signal includes：
Step 601, the T_con, the mainboard and the MCU are initialized；
Step 602, MCU obtains the pwm signal data that the luminance signal data that T_con plates are sent is sent with mainboard, described
Luminance signal data be used for describe subregion constant current driving device each area luminance signal, the luminance signal data with it is described
The luminance signal of subregion constant current driving device synchronizes；
Step 603, judge whether the luminance signal data and the pwm signal data are correct data；
Step 604, if the luminance signal data and the pwm signal data are correct data, the MCU is executed
Determine the need for adjusting the brightness of current display screen according to the pwm signal data, however, it is determined that need to adjust current display screen
Brightness, then the brightness of the display screen after adjustment is determined according to the luminance signal data and the pwm signal data；
Step 605, the Local dimming data in the luminance signal in each area after extraction adjustment, by the Local
Dimming data are converted to the register value of corresponding subregion constant current driving device；
Step 606, brightness is written to the communication of the constant current driving device in each area by the SPI communication agreement successively
Value.
Specifically, since the Local Dimming data in each area of reception are 1 byte, the every of constant current chip is corresponded to
The brightness value in a channel is 2 byte, needs to carry out data conversion according to the databook of constant current chip, extract inside array
The Local dimming data in each area, these data conversions at the register value of every constant current chip of correspondence.Then lead to again
SPI communication agreement is crossed, brightness value is write to all channels of every constant current chip successively, it is final to realize the bright of the corresponding lamp bar of control
Degree.
With reference to figure 7, Fig. 7 is a kind of function module signal of the device of control dim signal provided in an embodiment of the present invention
Figure.
In the figure 7, the device of the control dim signal includes：
Acquisition module 701, the pwm signal data that the luminance signal data for obtaining the transmission of T_con plates is sent with mainboard,
The luminance signal data be used for describe subregion constant current driving device each area luminance signal, the luminance signal data with
The luminance signal of the subregion constant current driving device synchronizes；
Preferably, the acquisition module 701, is used for：
Obtain the luminance signal data that the T_con plates are sent by SIP communication protocols.
Preferably, described device further includes：
Initialization module is used for before the MCU obtains luminance signal data and the pwm signal data of T_con plates, just
The beginningization T_con, the mainboard and the MCU；
Judgment module, the luminance signal data for obtaining T_con plates in the MCU judge with after pwm signal data
Whether the luminance signal data and the pwm signal data are correct data；If the luminance signal data and the PWM
Signal data is correct data, then executes the determining module.
Determining module 702, the brightness for determining the need for adjusting current display screen according to the pwm signal data,
If it is determined that needing to adjust the brightness of current display screen, is then determined and adjusted according to the luminance signal data and the pwm signal data
The brightness of display screen after whole.
Preferably, the determining module 702, is used for：
Concentrated collection is carried out to the pwm signal data and is ranked up from big to small, median is taken, by the median
It is compared with maximum PWM threshold values, minimum PWM threshold values, judges whether the pwm signal data are effective；
If the pwm signal data are effective, effective median in the pwm signal data and a upper period were obtained
The difference of effective median；
If the difference is not more than predetermined deviation value, it is determined that the PWM value maintains the bright of current display screen without adjustment
Degree；
If the difference is more than predetermined deviation value, it is determined that the PWM value has adjustment, after calculating adjustment according to preset formula
Display screen brightness；
Wherein, the preset formula is：In the brightness of display screen after variation=luminance signal data * current periods
Pwm signal data/current period when high level.
Preferably, described device further includes：
Conversion module, for determining the need for adjusting current display screen according to the pwm signal data in the MCU
Brightness, however, it is determined that it needs to adjust the brightness of current display screen, then it is true according to the luminance signal data and the pwm signal data
Set the tone it is whole after display screen brightness after, extraction adjustment after each area luminance signal in Local dimming data,
The Local dimming data are converted to the register value of corresponding subregion constant current driving device；
Writing module, for the communication of the constant current driving device in each area to be written successively by the SPI communication agreement
Brightness value.
The embodiment of the present invention provides a kind of device of control dim signal, and MCU obtains the luminance signal number that T_con plates are sent
According to the pwm signal data sent with mainboard；The MCU determines the need for adjusting current display according to the pwm signal data
The brightness of screen, however, it is determined that need to adjust the brightness of current display screen, then according to the luminance signal data and the pwm signal number
According to the brightness for determining the display screen after adjusting, this mode can meet different sizes, the LED LCD backlight TVs in different lamp areas
Demand meets the image quality requirement with HDR TVs, solves the hangover of image, ghost, water ripples problem；Improve image
Contrast and depth of field degree, improve the visual experience of consumer, push the development of LCD TV；Realize liquid crystal television LED
Lamp zonal control reduces TV consumption power, energy conservation and environmental protection.
With reference to figure 8, Fig. 8 is a kind of structural schematic diagram of the system of control dim signal provided in an embodiment of the present invention.
In fig. 8, the system of the control dim signal includes：
MCU801, T_con plate 802, mainboard 803 and subregion constant current driving device 804；
The MCU801, the pwm signal number that the luminance signal data for obtaining the transmission of T_con plates is sent with the mainboard
According to the luminance signal data is used to describe the luminance signal in each area of subregion constant current driving device, the luminance signal number
According to synchronous with the luminance signal of subregion constant current driving device；Adjustment is determined the need for according to the pwm signal data to work as
The brightness of preceding display screen, however, it is determined that need to adjust the brightness of current display screen, then according to the luminance signal data and the PWM
Signal data determines the brightness of the display screen after adjustment；
The T_con plates 802, for the luminance signal data by field sync signal and the subregion constant current driving device
It synchronizes, and sends the luminance signal data of the subregion constant current driving device to the MCU；
The mainboard 803, for sending pwm signal data to the MCU；
The subregion constant current driving device 804, the brightness letter in each area after adjustment for receiving the MCU transmissions
Number.
Wherein, multiple constant-current driven chips in the subregion constant current driving device 804 are connected by predetermined manner, described
Predetermined manner is：Data-signal is inputted by first chip, is exported the data-signal to second by first chip
A chip, then exported by second chip and give third chip, and so on, the data are believed by the last one chip
Number output and joins end to end to master chip.
Specifically, as shown in figure 9, according to LCD TV backlight modular construction, regions module is divided, because of each subregion constant current
Driving can individually control 16 areas, can select 1 to 16 domain as the case may be, visible area situation is equipped with again for each constant current driving
Multiple constant-current driven chips are pressed chrysanthemum by one or two decompression and voltage boosting dc module further according to entire backlight lamp area quantity
Flower on-link mode (OLM) is chained up, and what is meant by chrysanthemum on-link mode (OLM), i.e., is inputted by first chip using data-signal, then by first
A chip exports data to second chip, then by second output to third, and so on, it will by the last one chip
Data are conveyed to master chip, form the first connected mode, complete the transmission of entire data.It is directed to different regions in this way, increases
It is then very convenient to subtract constant current chip, autgmentability is strong.
After setting the mode of hardware, according to hardware platform and constant-current driven chip demand, the present invention selects MCU as permanent
Stream driving links bridge with T_con plates and mainboard, because T_con plates only have subregion luminance signal, can not be adjusted to integrally bright body,
Can only be later by introducing mainboard light modulation pwm signal, subregion constant current driving is controlled and refreshed by certain algorithm through MCU
Brightness.This MCU is programmed using C language, can be arranged in pairs or groups various liquid crystal displays by MCU, can standardized designs, transplantability is also strong.It is logical
It crosses MCU and T_con and discusses a communication protocol surely, this communication protocol drives core as MCU and T_con (MCU slaves) and constant current
Piece (MCU hosts) communicates benchmark.
The technical principle of the embodiment of the present invention is described above in association with specific embodiment.These descriptions are intended merely to explain this
The principle of inventive embodiments, and it cannot be construed to the limitation to protection domain of the embodiment of the present invention in any way.Based on herein
Explanation, those skilled in the art, which would not require any inventive effort, can associate the other specific of the embodiment of the present invention
Embodiment, these modes are fallen within the protection domain of the embodiment of the present invention.
Claims (12)
1. a kind of method of control dim signal, which is characterized in that the method includes：
MCU obtains the pwm signal data that the luminance signal data that T_con plates are sent is sent with mainboard, the luminance signal data
Luminance signal for each area for describing subregion constant current driving device, the luminance signal data drive with the subregion constant current
The luminance signal of device synchronizes；
Obtained the difference of effective median in the pwm signal data and effective median in a upper period, the MCU according to
Magnitude relationship between the difference and predetermined deviation value determines the need for adjusting the brightness of current display screen, however, it is determined that needs
The brightness of current display screen is adjusted, then is based on preset formula, is determined according to the luminance signal data and the pwm signal data
The brightness of display screen after adjustment, wherein effective median is the median of effective pwm signal data in each period,
It is described and when the median of the pwm signal data in each period is between maximum PWM threshold values and minimum PWM threshold values
Pwm signal data are effective pwm signal data.
2. according to the method described in claim 1, it is characterized in that, the MCU obtains the luminance signal data of T_con plates, packet
It includes：
The MCU obtains the luminance signal data that the T_con plates are sent by SIP communication protocols.
3. according to the method described in claim 1, it is characterized in that, the MCU obtain T_con plates luminance signal data with
Before pwm signal data, further include：
Initialize the T_con plates, the mainboard and the MCU；
The MCU obtains the luminance signal data of T_con plates with after pwm signal data, further includes：
Judge whether the luminance signal data and the pwm signal data are correct data；If the luminance signal data
It is correct data with the pwm signal data, then executes effective median in the acquisition pwm signal data and upper one week
The difference of effective median of phase；The MCU determines whether need according to the magnitude relationship between the difference and predetermined deviation value
Adjust the brightness of current display screen, however, it is determined that need to adjust the brightness of current display screen, then preset formula is based on, according to described
Luminance signal data and the pwm signal data determine the brightness of the display screen after adjustment, wherein effective median is every
The median of effective pwm signal data in a period, and when the median of the pwm signal data in each period is located at maximum PWM
When between threshold value and minimum PWM threshold values, the pwm signal data are effective pwm signal data.
4. according to the method described in claim 3, it is characterized in that, the effective centre obtained in the pwm signal data
The difference of value and effective median in a upper period；MCU is determined according to the magnitude relationship between the difference and predetermined deviation value
Whether need to adjust the brightness of current display screen, however, it is determined that need to adjust the brightness of current display screen, be then based on preset formula, root
The brightness of the display screen after adjustment is determined according to the luminance signal data and the pwm signal data, including：
Concentrated collection is carried out to the pwm signal data and is ranked up from big to small, median is taken, by the median and most
Big PWM threshold values, minimum PWM threshold values are compared, and judge whether the pwm signal data are effective；
If the pwm signal data are effective, the effective of effective median in the pwm signal data and a upper period was obtained
The difference of median；
If the difference is not more than predetermined deviation value, it is determined that the PWM value maintains the brightness of current display screen without adjustment；
If the difference is more than predetermined deviation value, it is determined that the PWM value has adjustment, is calculated according to preset formula aobvious after adjustment
The brightness of display screen；
Wherein, the preset formula is：High electricity in the brightness of display screen after variation=luminance signal data * current periods
Pwm signal data/current period usually.
5. according to Claims 1-4 any one the method, which is characterized in that the MCU is according to the difference and presets inclined
Magnitude relationship between difference determines the need for adjusting the brightness of current display screen, however, it is determined that needs to adjust current display screen
Brightness is then based on preset formula, and the display screen after adjustment is determined according to the luminance signal data and the pwm signal data
After brightness, further include：
Local dimming data in the luminance signal in each area after extraction adjustment, by the Local dimming data
Be converted to the register value of corresponding subregion constant current driving device；
Brightness value is written to the communication of the constant current driving device in each area successively by SPI communication agreement.
6. a kind of device of control dim signal, which is characterized in that described device includes：
Acquisition module, the pwm signal data that the luminance signal data for obtaining the transmission of T_con plates is sent with mainboard are described bright
Degree signal data be used for describe subregion constant current driving device each area luminance signal, the luminance signal data with described point
The luminance signal of area's constant current driving device synchronizes；
Determining module, the difference for obtaining effective median in the pwm signal data and effective median in a upper period
Value, MCU determine the need for adjusting the brightness of current display screen according to the magnitude relationship between the difference and predetermined deviation value,
If it is determined that the brightness for adjusting current display screen is needed to be believed according to the luminance signal data and the PWM then based on preset formula
Number determines the brightness of the display screen after adjustment, wherein effective median is effective pwm signal data in each period
Median, and when the median of the pwm signal data in each period be located at maximum PWM threshold values and minimum PWM threshold values it
Between when, the pwm signal data be effective pwm signal data.
7. device according to claim 6, which is characterized in that the acquisition module is used for：
Obtain the luminance signal data that the T_con plates are sent by SIP communication protocols.
8. device according to claim 6, which is characterized in that described device further includes：
Initialization module, the luminance signal data for obtaining T_con plates in the MCU are initialized with before pwm signal data
The T_con, the mainboard and the MCU；
Judgment module is used for after the MCU obtains luminance signal data and the pwm signal data of T_con plates, described in judgement
Whether luminance signal data and the pwm signal data are correct data；If the luminance signal data and the pwm signal
Data are correct data, then execute the determining module.
9. device according to claim 8, which is characterized in that the determining module is used for：
Concentrated collection is carried out to the pwm signal data and is ranked up from big to small, median is taken, by the median and most
Big PWM threshold values, minimum PWM threshold values are compared, and judge whether the pwm signal data are effective；
If the pwm signal data are effective, the effective of effective median in the pwm signal data and a upper period was obtained
The difference of median；
If the difference is not more than predetermined deviation value, it is determined that the PWM value maintains the brightness of current display screen without adjustment；
If the difference is more than predetermined deviation value, it is determined that the PWM value has adjustment, is calculated according to preset formula aobvious after adjustment
The brightness of display screen；
Wherein, the preset formula is：High electricity in the brightness of display screen after variation=luminance signal data * current periods
Pwm signal data/current period usually.
10. according to the device described in claim 6 to 9 any one, which is characterized in that described device further includes：
Conversion module, for determining whether need according to the magnitude relationship evidence between the difference and predetermined deviation value in the MCU
Adjust the brightness of current display screen, however, it is determined that need to adjust the brightness of current display screen, then preset formula is based on, according to described
After luminance signal data and the pwm signal data determine the brightness of the display screen after adjustment, each area after extraction adjustment
Luminance signal in Local dimming data, the Local dimming data are converted into corresponding subregion constant current and are driven
The register value of dynamic device；
Writing module, for brightness value to be written to the communication of the constant current driving device in each area successively by SPI communication agreement.
11. a kind of system of control dim signal, which is characterized in that it is permanent that the system comprises MCU, T_con plate, mainboard and subregions
Flow driving device；
The MCU, the pwm signal data that the luminance signal data for obtaining the transmission of T_con plates is sent with the mainboard are described
Luminance signal data be used for describe subregion constant current driving device each area luminance signal, the luminance signal data with it is described
The luminance signal of subregion constant current driving device synchronizes；Obtained effective median in the pwm signal data and a upper period
It is current aobvious to determine the need for adjustment according to the magnitude relationship between the difference and predetermined deviation value for the difference of effective median
The brightness of display screen, however, it is determined that need to adjust the brightness of current display screen, then preset formula is based on, according to the luminance signal data
The brightness of the display screen after adjustment is determined with the pwm signal data, wherein effective median is the effective of each period
The median of pwm signal data, and when the median of the pwm signal data in each period is located at maximum PWM threshold values and minimum
When between PWM threshold values, the pwm signal data are effective pwm signal data；
The T_con plates, for synchronous with the luminance signal data of subregion constant current driving device by field sync signal, and
The luminance signal data of the subregion constant current driving device is sent to the MCU；
The mainboard, for sending pwm signal data to the MCU；
The subregion constant current driving device, the luminance signal in each area after adjustment for receiving the MCU transmissions.
12. system according to claim 11, which is characterized in that multiple constant currents in the subregion constant current driving device are driven
Dynamic chip is connected by predetermined manner, and the predetermined manner is：Data-signal is inputted by first chip, by first core
Piece exports the data-signal to second chip, then is exported by second chip and give third chip, and so on,
The data-signal is exported to master chip by the last one chip, and is joined end to end.
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| JP6741628B2 (en) * | 2017-08-03 | 2020-08-19 | セイコーエプソン株式会社 | Display device, electronic device, and method of driving display device |
| CN109119032A (en) * | 2018-09-11 | 2019-01-01 | 重庆爱奇艺智能科技有限公司 | A kind of method and system that backlight that eliminating LCD smear is adjusted |
| CN112005293A (en) | 2018-11-27 | 2020-11-27 | 惠普发展公司，有限责任合伙企业 | Display with changing dimming zones |
| CN110095256B (en) * | 2019-05-08 | 2021-12-07 | 歌尔股份有限公司 | Projector optical machine testing system and method |
| CN112150975B (en) * | 2019-06-26 | 2022-06-03 | 京东方科技集团股份有限公司 | Display device and driving method thereof |
| 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 |
| CN113284445B (en) * | 2021-06-09 | 2022-03-29 | 深圳市皓丽软件有限公司 | Regional dimming function detection method and device and storage medium |
| CN113257188B (en) * | 2021-06-28 | 2021-09-17 | 南京初芯集成电路有限公司 | Device and method for controlling TFT screen backlight in OLED control panel system |
| CN114220398B (en) * | 2021-12-20 | 2024-08-06 | 深圳市康冠智能科技有限公司 | Backlight control method and display device |
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