CN105976770A - Method for controlling dimming signal and device and system thereof - Google Patents
Method for controlling dimming signal and device and system thereof Download PDFInfo
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- CN105976770A CN105976770A CN201610578291.1A CN201610578291A CN105976770A CN 105976770 A CN105976770 A CN 105976770A CN 201610578291 A CN201610578291 A CN 201610578291A CN 105976770 A CN105976770 A CN 105976770A
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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 method for controlling a dimming signal and a device and a system thereof The method comprises the steps that an MCU acquires brightness data transmitted by a T_con board and PWM signal data transmitted by a mainboard; and the MCU determines adjustment of the current brightness of a display screen according to the PWM signal data, and the adjusted brightness of the display screen is determined according to the brightness signal data and the PWM signal data if the requirement for adjusting the current brightness of the display screen is determined. According to the method, the requirements of LED liquid crystal backlight televisions of different sizes and different lamp areas can be met, the requirements for the frame quality of the televisions having an HDR function can be met, and the problems of trailing, ghosting and water ripple of images can be solved; the contrast and the depth of field of the images can be enhanced, the visual perception of consumers can be enhanced and the development of the liquid crystal televisions can be promoted; and partitioning control of liquid crystal television LED lamps can be realized, power consumption of the televisions can be reduced and thus the method is energy-saving and environment-friendly.
Description
Technical field
The present embodiments relate to LED backlight LCD TV, particularly relate to a kind of dim signal that controls
Method, Apparatus and system.
Background technology
Along with the development of intelligent television, consumer is more and more higher to the requirement of image quality, has
The television set of high dynamic range images (High-Dynamic Range, HDR) function is to image quality
Requirement higher, such as there is the television set of HDR function and require that the local luminance of image is brighter, darkness
Darker, it is used for carrying High Specific Radioactivity.Use side-light type local dimming backlight to meet and there is HDR function
Television set requirement, it is dynamic that current industry side-light type local dimming is generally produced district by TV motherboard master chip
Region control dim signal, and then control area light modulation driving constant current plate, the backlight that this kind of mode produces
Drive control signal can not be Tong Bu with liquid crystal display screen luminance signal, especially for the electricity with HDR function
Depending on the picture signal of machine, can cause hangover, shadow and the appearance of water ripples, this mode not only can not
Promote the image quality of image, on the contrary image is created harmful effect.
Summary of the invention
The purpose of the embodiment of the present invention is to propose a kind of control the method for dim signal, device and be
System, it is intended to solve how to avoid hangover, the shadow phenomenon occurred during HDR image.
For reaching this purpose, the embodiment of the present invention by the following technical solutions:
First aspect, a kind of method controlling dim signal, described method includes:
MCU obtains luminance signal data and the pwm signal data of mainboard transmission that T_con plate sends,
Described luminance signal data is for describing the luminance signal in each district of subregion constant current driving device, described bright
Degree signal data is Tong Bu with the luminance signal of described subregion constant current driving device；
Described MCU determines the need for adjusting the bright of currently displaying screen according to described pwm signal data
Degree, however, it is determined that need to adjust the brightness of currently displaying screen, then according to described luminance signal data and described
Pwm signal data determine the brightness of the display screen after adjustment.
Preferably, described MCU obtains the luminance signal data of T_con plate, including:
Described MCU obtains the described luminance signal number that described T_con plate is sent by SIP communication protocol
According to.
Preferably, described MCU obtain T_con plate luminance signal data and pwm signal data it
Before, also include:
Initialize described T_con plate, described mainboard and described MCU；
After described MCU obtains luminance signal data and the pwm signal data of T_con plate, also wrap
Include:
Judge whether described luminance signal data and described pwm signal data are correct data；If institute
State luminance signal data and described pwm signal data are correct data, then perform described MCU root
Determine the need for adjusting the brightness of currently displaying screen according to described pwm signal data, however, it is determined that need to adjust
The brightness of whole currently displaying screen, then determine according to described luminance signal data and described pwm signal data
The brightness of the display screen after adjustment.
Preferably, described MCU determines the need for adjusting currently displaying screen according to pwm signal data
Brightness, however, it is determined that need to adjust the brightness of currently displaying screen, then according to described luminance signal data and institute
State pwm signal data and determine the brightness of the display screen after adjustment, including:
Described pwm signal data carried out concentrated collection and be ranked up from big to small, taking intermediate value,
Described intermediate value is compared with maximum PWM threshold value, minimum PWM threshold value, it is judged that described
Pwm signal data are the most effective；
If described pwm signal data are effective, then obtain the effective centre in described pwm signal data
The difference of effective intermediate value in value and a upper cycle；
If described difference is not more than predetermined deviation value, it is determined that described PWM value, without adjusting, remains current
The brightness of display screen；
If described difference is more than predetermined deviation value, it is determined that described PWM value has adjustment, according to default public affairs
Formula calculates the brightness of the display screen after adjusting；
Wherein, described preset formula is: the brightness of the display screen after change=described luminance signal data *
Pwm signal data/current period during high level in current period.
Preferably, described MCU determines the need for adjusting current showing according to described pwm signal data
The brightness of display screen, however, it is determined that need to adjust the brightness of currently displaying screen, then according to described luminance signal number
After the brightness determining the display screen after adjustment with described pwm signal data, also include:
Extract the Local dimming data in the luminance signal in each district after adjusting, by described Local
Dimming data are converted to the register value of the subregion constant current driving device of correspondence；
The communication write brightness to the constant current driving device in each district successively by described SPI communication agreement
Value.
Second aspect, a kind of device controlling dim signal, described device includes:
Acquisition module, the PWM that the luminance signal data sent for obtaining T_con plate sends with mainboard
Signal data, described luminance signal data is for describing the brightness letter in each district of subregion constant current driving device
Number, described luminance signal data is Tong Bu with the luminance signal of described subregion constant current driving device；
Determine module, for determining the need for adjusting currently displaying screen according to described pwm signal data
Brightness, however, it is determined that need to adjust the brightness of currently displaying screen, then according to described luminance signal data and institute
State pwm signal data and determine the brightness of the display screen after adjustment.
Preferably, described acquisition module, it is used for:
Obtain the described luminance signal data that described T_con plate is sent by SIP communication protocol.
Preferably, described device also includes:
Initialization module, for obtaining luminance signal data and the PWM of T_con plate at described MCU
Before signal data, initialize described T_con, described mainboard and described MCU；
Judge module, believes with PWM for obtaining the luminance signal data of T_con plate at described MCU
After number, it is judged that whether described luminance signal data and described pwm signal data are correct number
According to；If described luminance signal data and described pwm signal data are correct data, then perform described
Determine module.
Preferably, described determine module, be used for:
Described pwm signal data carried out concentrated collection and be ranked up from big to small, taking intermediate value,
Described intermediate value is compared with maximum PWM threshold value, minimum PWM threshold value, it is judged that described
Pwm signal data are the most effective；
If described pwm signal data are effective, then obtain the effective centre in described pwm signal data
The difference of effective intermediate value in value and a upper cycle；
If described difference is not more than predetermined deviation value, it is determined that described PWM value, without adjusting, remains current
The brightness of display screen；
If described difference is more than predetermined deviation value, it is determined that described PWM value has adjustment, according to default public affairs
Formula calculates the brightness of the display screen after adjusting；
Wherein, described preset formula is: the brightness of the display screen after change=described luminance signal data *
Pwm signal data/current period during high level in current period.
Preferably, described device also includes:
Modular converter, for determining the need for adjusting according to described pwm signal data at described MCU
The brightness of whole currently displaying screen, however, it is determined that need to adjust the brightness of currently displaying screen, then according to described bright
After degree signal data and described pwm signal data determine the brightness of the display screen after adjustment, extract and adjust
Local dimming data in the luminance signal in each district after whole, by described Local dimming
Data are converted to the register value of the subregion constant current driving device of correspondence；
Writing module, for by described SPI communication agreement successively to the constant current driving device in each district
Communication write brightness value.
The third aspect, a kind of system controlling dim signal, described system include MCU, T_con plate,
Mainboard and subregion constant current driving device；
Described MCU, for obtaining luminance signal data and the transmission of described mainboard that T_con plate sends
Pwm signal data, described luminance signal data is for describing each district of subregion constant current driving device
Luminance signal, described luminance signal data is Tong Bu with the luminance signal of described subregion constant current driving device；Root
Determine the need for adjusting the brightness of currently displaying screen according to described pwm signal data, however, it is determined that need to adjust
The brightness of whole currently displaying screen, then determine according to described luminance signal data and described pwm signal data
The brightness of the display screen after adjustment；
Described T_con plate, for believing by the brightness of field sync signal with described subregion constant current driving device
Number synchronizes, and sends the luminance signal data of described subregion constant current driving device to described MCU；
Described mainboard, for sending pwm signal data to described MCU；
Described subregion constant current driving device, each district after receiving the adjustment that described MCU sends
Luminance signal.
Preferably, the multiple constant-current driven chips in described subregion constant current driving device are by predetermined manner even
Connecing, described predetermined manner is: data signal is inputted by first chip, by described first chip by institute
State data signal to export to second chip, then exported to the 3rd chip by described second chip, depend on
This analogizes, last chip export described data signal to master chip, and join end to end.
The embodiment of the present invention provides a kind of method of dim signal, Apparatus and system of controlling, and MCU obtains
The pwm signal data that the luminance signal data that T_con plate sends sends with mainboard；Described MCU root
Determine the need for adjusting the brightness of currently displaying screen according to described pwm signal data, however, it is determined that need to adjust
The brightness of whole currently displaying screen, then determine according to described luminance signal data and described pwm signal data
The brightness of the display screen after adjustment, this mode can meet different size, the LED liquid crystal in different lamp districts
The demand of backlight TV, meets the image quality requirement with HDR function TV, solves the hangover of image,
Ghost, water ripples problem；Improve contrast and the depth of field degree of image, improve the visual experience of consumer,
Promote the development of LCD TV；Achieve liquid crystal television LED lamp zonal control, reduce TV consumption
Power, energy-conserving and environment-protective.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of a kind of method controlling dim signal that the embodiment of the present invention provides；
Fig. 2 is the schematic diagram of the data structure of a kind of SIP communication protocol that the embodiment of the present invention provides；
Fig. 3 is the data signal figure of a kind of SIP communication that the embodiment of the present invention provides；
Fig. 4 is a kind of PWM count schematic flow sheet according to the method for computing of embodiment of the present invention offer；
Fig. 5 is the schematic flow sheet of the another kind of method controlling dim signal that the embodiment of the present invention provides；
Fig. 6 is the schematic flow sheet of the another kind of method controlling dim signal that the embodiment of the present invention provides；
Fig. 7 is the functional module signal of a kind of device controlling dim signal that the embodiment of the present invention provides
Figure；
Fig. 8 is the structural representation of a kind of system controlling dim signal that the embodiment of the present invention provides；
Fig. 9 is the structural representation of the another kind of system controlling dim signal that the embodiment of the present invention provides.
Detailed description of the invention
With embodiment, the embodiment of the present invention is described in further detail below in conjunction with the accompanying drawings.Can manage
Solving, specific embodiment described herein is used only for explaining the embodiment of the present invention, rather than to this
The restriction of inventive embodiments.It also should be noted that, for the ease of describing, accompanying drawing only illustrates
The part relevant to the embodiment of the present invention rather than entire infrastructure.
It is the flow process of a kind of method controlling dim signal that the embodiment of the present invention provides with reference to Fig. 1, Fig. 1
Schematic diagram.
As it is shown in figure 1, the method for described control dim signal includes:
Step 101, micro-control unit (Microcontroller Unit, MCU) obtains what T_con plate sent
Pulse width modulation (Pulse Width Modulation, the PWM) letter that luminance signal data and mainboard send
Number, described luminance signal data is for describing the brightness letter in each district of subregion constant current driving device
Number, described luminance signal data is Tong Bu with the luminance signal of described subregion constant current driving device；
Concrete, MCU obtains luminance signal data and the pwm signal number that T_con plate sends in real time
According to, and from pwm signal data, judge whether the brightness needing to adjust currently displaying screen.Such as, if
In the case of user manually triggers the brightness adjusting display screen, can be according to the pwm signal obtained in real time
Data determine to be needed to adjust；Or television set is according to ambient parameter self-adaptative adjustment such as the light of surrounding
In the case of the brightness of display screen, can determine according to the pwm signal data obtained in real time and need to adjust.
There is the image brightness signal of the liquid crystal flat-plate television of HDR function, make the liquid crystal in liquid crystal display screen body
Molecule rotation is bright with the LED backlight light source of subregion secretly can not be synchronize, and the image being directed at HDR function goes out
Now hangover, shadow, water ripples problem.
Because liquid crystal display screen itself can not be luminous, special backlight is needed to provide light, during details in a play not acted out on stage, but told through dialogues, by changing
Become the Liquid Crystal Molecules Alignment that liquid crystal display screen screen is internal, block light ginseng and pass through, and backlight is working always,
Screen image details in a play not acted out on stage, but told through dialogues can not well show with stereovision.During bright field, by changing in liquid crystal display screen body
The liquid crystal molecule anglec of rotation, make light pass through.There is the TV of HDR function, need to be by bright field part
Corresponding backlight region brightness raises brighter, then with greater need for the liquid crystal molecule anglec of rotation in liquid crystal display screen body
Degree sequential is consistent with backlight driver sequential, can embody bright field brighter, can eliminate ghost simultaneously.Details in a play not acted out on stage, but told through dialogues
Light source then need to be completely closed by the backlight corresponding to Bu Fen, makes image level sense obvious, and contrast etc. shows
Writing and promote, image effect is significantly improved, and promotes visual experience.
LDE backlight constant-current driving rotates Tong Bu for the liquid crystal molecule internal with liquid crystal display screen screen, then need
From screen body T_con (Timing controller) in data taken signal, and using field sync signal as
Constant-current driving switching frequency, reaches to solve the hangover occurred during HDR, shadow, water ripples problem.Cause
T_con constant-current driving control signal does not has backlight overall brightness to control, and the brightness of TV is according to consumer
Like and set how to solve T_con to take LED backlight drive control signal without brilliance control
Problem, introduces brightness control signal one PWM produced by mainboard.
According to above situation, MCU receive T_con data, then receive the PWM that mainboard sends
Signal, by MCU by specific operation method after, then go the LED backlight constant current of control partition to drive
Dynamic.
Preferably, described MCU obtains the luminance signal data of T_con plate, including:
Described MCU obtains the described T_con brightness letter that described T_con sends according to SIP communication protocol
Number.
Concrete, the form of SIP communication protocol is as follows:
Concrete, as shown in Figure 2 and Figure 3, for data structure, the signal graph of SIP communication protocol.
The setting of all times is according to a field signal time (Vsync vertical interval) and lamp bar region
Division is arranged, in a field signal cycle domestic demand by complete for all signal processing.
Tc1: to Vsync positive pulse requirement；
Tc2: on the basis of Vsync, starts after need to postponing the regular hour to produce clock signal and send out again
Send data；
Tc3: be as the case may be with selected MCU and lamp bar region to set clock frequency；
Tc3: set according to the stability of Vsync with all data processing times and work wave；
T4: need to set according to the stability of MCU with all data processing times and work wave.
T5: need to set according to the stability of MCU with all data processing times and work wave.
Step 102, described MCU determines the need for adjusting currently according to described pwm signal data
The brightness of display screen, however, it is determined that need to adjust the brightness of currently displaying screen, then according to described luminance signal number
According to the brightness determining the display screen after adjustment with described pwm signal data.
Preferably, described MCU determines the need for adjusting currently displaying screen according to pwm signal data
Brightness, however, it is determined that need to adjust the brightness of currently displaying screen, then according to described luminance signal data and institute
State pwm signal data and determine the brightness of the display screen after adjustment, including:
Described pwm signal data carried out concentrated collection and be ranked up from big to small, taking intermediate value,
Described intermediate value is compared with maximum PWM threshold value, minimum PWM threshold value, it is judged that described
Pwm signal data are the most effective；
If described pwm signal data are effective, then obtain the effective centre in described pwm signal data
The difference of effective intermediate value in value and a upper cycle；
If described difference is not more than predetermined deviation value, it is determined that described PWM value, without adjusting, remains current
The brightness of display screen；
If described difference is more than predetermined deviation value, it is determined that described PWM value has adjustment, according to default public affairs
Formula calculates the brightness of the display screen after adjusting；
Wherein, described preset formula is: the brightness of the display screen after change=described luminance signal data *
Pwm signal data/current period during high level in current period.
Concrete, BLK on/off controls each module for power supply, mainboard master chip control, when sending start
After signal, open MCU, subregion constant-current driving, DC-DC power switch.
After MCU energising, first initialize MCU, then initialize subregion constant-current driving, program initialization
After, start to receive the SPI data of T_con, then resolve data, it is judged that whether the data inside array
Correctly, if correctly, receive the pwm signal that mainboard sends, PWM is judged, then enters
Row mean filter method.
In the control logic of this MCU, the event of process is to operate in single-threaded mode, with some
After state has performed, just can go to perform next state, can be closely connected between each state,
By the way of state switches, it is easy to allow MCU switch between each state, the most more can allow simultaneously
Software developer analyzes whether some state local exists bugs clearly.State handover mechanism is by program
Readability, portability, become the most flexible.This program is from detecting SPI data, judging SPI number
According to, detection PWM, judge PWM, data operation fully employ state switch method.
Wherein, mean filter method refers to, at a series of continuous print Data processings, data be carried out concentration and adopts
Collection, with data sorting from big to small, takes intermediate value from sequencing sequence, by intermediate value with maximum, minimum
PWM threshold value judges that these group data are whether effective, if effectively, that takes out in these group data is effective
Intermediate value, then intermediate value effective with the last time contrast, if being not more than the deviation value set, i.e.
Think that this PWM value is unchanged, state of remaining stationary；If greater than the deviation value set, then it is assumed that this PWM
There occurs change, then the intermediate value of these data is assigned to the intermediate value of upper one group of data, enters with this intermediate value
Row PWM count is according to computing.The method of this acquirement average, referred to as mean filter method.This programme is abundant
Use the method that PWM detection is processed, it is ensured that the effectiveness of Data Detection.The method detailed
Thin function function computing formula divides two parts, first part, PWM mean filter method, the second part
PWM computing.
Concrete, as shown in Figure 4, Fig. 4 is that a kind of PWM count of embodiment of the present invention offer is according to computing
The schematic flow sheet of method.
As shown in Figure 4, described PWM count includes according to the method for computing:
Step 401, the data in array sort from big to small；
Step 402, takes out the intermediate value in sorting data；
Step 403, it is judged that whether these data are in standard；
Step 404, if judging, these data in standard, then take out the intermediate value in sorting data；
Step 405, if judge these data not in standard, then status register reset, wait next time
Data；
Step 406, after taking out the intermediate value in sorting data, it is judged that whether sequence array mediant
More than a upper array intermediate value；
Step 407, if sequence array mediant is more than a upper array intermediate value, then takes out intermediate data value
Subtract a upper mediant；
Step 408, if sequence array mediant is not more than a upper array intermediate value, then goes up an intermediate data
Subtract existing intermediate value；
Step 409, after taking-up intermediate data value subtracts a upper mediant, it is judged that whether difference is in thresholding；
Step 410, if not in thresholding, then updates PWM；
Step 411, if in thresholding, does not the most update PWM count evidence；
Step 412, updates status register；
Step 413, PWM computing；
Step 414, updates status register；
Step 415, data send.
The embodiment of the present invention provides a kind of method controlling dim signal, and MCU obtains T_con plate and sends
The pwm signal data that send of luminance signal data and mainboard；Described MCU is according to described PWM
Signal data determines the need for adjusting the brightness of currently displaying screen, however, it is determined that need to adjust currently displaying screen
Brightness, then determine the display after adjustment according to described luminance signal data and described pwm signal data
The brightness of screen, this mode can meet different size, the need of the LED LCD backlight TV in different lamp districts
Ask, meet the image quality requirement with HDR function TV, solve the hangover of image, ghost, ripples
Stricture of vagina problem；Improve contrast and the depth of field degree of image, improve the visual experience of consumer, promote liquid crystal
The development of TV；Achieve liquid crystal television LED lamp zonal control, reduce TV power consumption, joint
Can environmental protection.
It is the stream of the another kind of method controlling dim signal that the embodiment of the present invention provides with reference to Fig. 5, Fig. 5
Journey schematic diagram.
As it is shown in figure 5, the method for described control dim signal includes:
Step 501, initializes described T_con, described mainboard and described MCU；
Step 502, MCU obtains luminance signal data and the PWM of mainboard transmission that T_con plate sends
Signal data, described luminance signal data is for describing the brightness letter in each district of subregion constant current driving device
Number, described luminance signal data is Tong Bu with the luminance signal of described subregion constant current driving device；
Step 503, it is judged that whether described luminance signal data and described pwm signal data are correct
Data；
Step 504, if described luminance signal data and described pwm signal data are correct data,
Then perform described MCU to determine the need for adjusting currently displaying screen according to described pwm signal data
Brightness, however, it is determined that need to adjust the brightness of currently displaying screen, then according to described luminance signal data and described
Pwm signal data determine the brightness of the display screen after adjustment.
It is the stream of the another kind of method controlling dim signal that the embodiment of the present invention provides with reference to Fig. 6, Fig. 6
Journey schematic diagram.
As shown in Figure 6, the method for described control dim signal includes:
Step 601, initializes described T_con, described mainboard and described MCU；
Step 602, MCU obtains luminance signal data and the PWM of mainboard transmission that T_con plate sends
Signal data, described luminance signal data is for describing the brightness letter in each district of subregion constant current driving device
Number, described luminance signal data is Tong Bu with the luminance signal of described subregion constant current driving device；
Step 603, it is judged that whether described luminance signal data and described pwm signal data are correct
Data；
Step 604, if described luminance signal data and described pwm signal data are correct data,
Then perform described MCU to determine the need for adjusting currently displaying screen according to described pwm signal data
Brightness, however, it is determined that need to adjust the brightness of currently displaying screen, then according to described luminance signal data and described
Pwm signal data determine the brightness of the display screen after adjustment；
Step 605, extracts the Local dimming data in the luminance signal in each district after adjusting,
Described Local dimming data are converted to the register value of the subregion constant current driving device of correspondence；
Step 606, the communication to the constant current driving device in each district successively by described SPI communication agreement
Write brightness value.
Concrete, the Local Dimming data in each district owing to receiving are 1 byte, corresponding permanent
The brightness value of each passage of stream chip is 2 byte, needs to carry out according to the data book of constant current chip
Data are changed, the Local dimming data in each district inside extraction array, and these data are changed
Become the register value of corresponding every constant current chip.The most again by SPI communication agreement, successively to every perseverance
All passages of stream chip write brightness value, the final brightness realizing controlling corresponding lamp bar.
It is the function of a kind of device controlling dim signal that the embodiment of the present invention provides with reference to Fig. 7, Fig. 7
Module diagram.
In the figure 7, the device of described control dim signal includes:
Acquisition module 701, for obtaining luminance signal data and the mainboard transmission that T_con plate sends
Pwm signal data, described luminance signal data is for describing each district of subregion constant current driving device
Luminance signal, described luminance signal data is Tong Bu with the luminance signal of described subregion constant current driving device；
Preferably, described acquisition module 701, it is used for:
Obtain the described luminance signal data that described T_con plate is sent by SIP communication protocol.
Preferably, described device also includes:
Initialization module, for obtaining luminance signal data and the PWM of T_con plate at described MCU
Before signal data, initialize described T_con, described mainboard and described MCU；
Judge module, believes with PWM for obtaining the luminance signal data of T_con plate at described MCU
After number, it is judged that whether described luminance signal data and described pwm signal data are correct number
According to；If described luminance signal data and described pwm signal data are correct data, then perform described
Determine module.
Determine module 702, for determining the need for adjusting current showing according to described pwm signal data
The brightness of display screen, however, it is determined that need to adjust the brightness of currently displaying screen, then according to described luminance signal data
With the brightness that described pwm signal data determine the display screen after adjustment.
Preferably, described determine module 702, be used for:
Described pwm signal data carried out concentrated collection and be ranked up from big to small, taking intermediate value,
Described intermediate value is compared with maximum PWM threshold value, minimum PWM threshold value, it is judged that described
Pwm signal data are the most effective；
If described pwm signal data are effective, then obtain the effective centre in described pwm signal data
The difference of effective intermediate value in value and a upper cycle；
If described difference is not more than predetermined deviation value, it is determined that described PWM value, without adjusting, remains current
The brightness of display screen；
If described difference is more than predetermined deviation value, it is determined that described PWM value has adjustment, according to default public affairs
Formula calculates the brightness of the display screen after adjusting；
Wherein, described preset formula is: the brightness of the display screen after change=described luminance signal data *
Pwm signal data/current period during high level in current period.
Preferably, described device also includes:
Modular converter, for determining the need for adjusting according to described pwm signal data at described MCU
The brightness of whole currently displaying screen, however, it is determined that need to adjust the brightness of currently displaying screen, then according to described bright
After degree signal data and described pwm signal data determine the brightness of the display screen after adjustment, extract and adjust
Local dimming data in the luminance signal in each district after whole, by described Local dimming
Data are converted to the register value of the subregion constant current driving device of correspondence；
Writing module, for by described SPI communication agreement successively to the constant current driving device in each district
Communication write brightness value.
The embodiment of the present invention provides a kind of device controlling dim signal, and MCU obtains T_con plate and sends
The pwm signal data that send of luminance signal data and mainboard；Described MCU is according to described PWM
Signal data determines the need for adjusting the brightness of currently displaying screen, however, it is determined that need to adjust currently displaying screen
Brightness, then determine the display after adjustment according to described luminance signal data and described pwm signal data
The brightness of screen, this mode can meet different size, the need of the LED LCD backlight TV in different lamp districts
Ask, meet the image quality requirement with HDR function TV, solve the hangover of image, ghost, ripples
Stricture of vagina problem；Improve contrast and the depth of field degree of image, improve the visual experience of consumer, promote liquid crystal
The development of TV；Achieve liquid crystal television LED lamp zonal control, reduce TV power consumption, joint
Can environmental protection.
It is the structure of a kind of system controlling dim signal that the embodiment of the present invention provides with reference to Fig. 8, Fig. 8
Schematic diagram.
In fig. 8, the system of described control dim signal includes:
MCU801, T_con plate 802, mainboard 803 and subregion constant current driving device 804；
Described MCU801, the luminance signal data sent for obtaining T_con plate sends with described mainboard
Pwm signal data, described luminance signal data is for describing each district of subregion constant current driving device
Luminance signal, described luminance signal data is Tong Bu with the luminance signal of described subregion constant current driving device；
Determine the need for adjusting the brightness of currently displaying screen according to described pwm signal data, however, it is determined that need
Adjust the brightness of currently displaying screen, then true according to described luminance signal data and described pwm signal data
Set the tone whole after the brightness of display screen；
Described T_con plate 802, bright for by field sync signal and described subregion constant current driving device
Degree signal data synchronizes, and sends the luminance signal number of described subregion constant current driving device to described MCU
According to；
Described mainboard 803, for sending pwm signal data to described MCU；
Described subregion constant current driving device 804, for receive described MCU send adjustment after each
The luminance signal in district.
Wherein, the multiple constant-current driven chips in described subregion constant current driving device 804 pass through predetermined manner
Connecting, described predetermined manner is: data signal is inputted by first chip, will by described first chip
Described data signal exports to second chip, then is exported to the 3rd chip by described second chip,
The rest may be inferred, last chip export described data signal to master chip, and join end to end.
Concrete, as it is shown in figure 9, according to LCD TV backlight modular construction, zoning module, because of
Each subregion constant-current driving can individually control 16 districts, can select 1 to 16 territory as the case may be, often
Individual constant-current driving viewing area situation again is equipped with one or two blood pressure lowering and voltage boosting dc module, further according to whole
Multiple constant-current driven chips are chained up, what is meant by chrysanthemum by individual backlight lamp district quantity by Flos Chrysanthemi on-link mode (OLM)
Flower on-link mode (OLM), i.e. uses data signal to be inputted by first chip, then by first chip by data
Output is to second chip, then by second output to the 3rd, the rest may be inferred, by last chip
Data are flowed to master chip, forms the mode that first place is connected, complete the transmission of whole data.So pin
To different regions, increase and decrease constant current chip is the most very convenient, and autgmentability is strong.
When, after the mode setting hardware, according to hardware platform and constant-current driven chip demand, the present invention selects
MCU links bridge, because T_con plate only has subregion bright as constant-current driving and T_con plate and mainboard
Degree signal, cannot adjust overall bright body, can only be by introducing mainboard light modulation pwm signal later, warp
MCU is controlled and the brightness refreshing subregion constant-current driving by certain algorithm.This MCU uses C
Programming with Pascal Language, can be arranged in pairs or groups various liquid crystal display screen by MCU, can standardized designs, transplantability is the strongest.
Surely discussed a communication protocol by MCU Yu T_con, this communication protocol is as MCU and T_con
(MCU is from machine) and constant-current driven chip (MCU main frame) communication benchmark.
The know-why of the embodiment of the present invention is described above in association with specific embodiment.These descriptions are simply
Explain the principle of the embodiment of the present invention, and can not be construed to by any way the embodiment of the present invention is protected
The restriction of scope.Based on explanation herein, those skilled in the art need not pay performing creative labour
Can associate other detailed description of the invention of the embodiment of the present invention, it is real that these modes fall within the present invention
Within executing the protection domain of example.
Claims (12)
1. the method controlling dim signal, it is characterised in that described method includes:
MCU obtains luminance signal data and the pwm signal data of mainboard transmission that T_con plate sends,
Described luminance signal data is for describing the luminance signal in each district of subregion constant current driving device, described bright
Degree signal data is Tong Bu with the luminance signal of described subregion constant current driving device；
Described MCU determines the need for adjusting the bright of currently displaying screen according to described pwm signal data
Degree, however, it is determined that need to adjust the brightness of currently displaying screen, then according to described luminance signal data and described
Pwm signal data determine the brightness of the display screen after adjustment.
Method the most according to claim 1, it is characterised in that described MCU obtains T_con
The luminance signal data of plate, including:
Described MCU obtains the described luminance signal number that described T_con plate is sent by SIP communication protocol
According to.
Method the most according to claim 1, it is characterised in that described MCU obtains T_con
Before the luminance signal data of plate and pwm signal data, also include:
Initialize described T_con plate, described mainboard and described MCU；
After described MCU obtains luminance signal data and the pwm signal data of T_con plate, also wrap
Include:
Judge whether described luminance signal data and described pwm signal data are correct data；If institute
State luminance signal data and described pwm signal data are correct data, then perform described MCU root
Determine the need for adjusting the brightness of currently displaying screen according to described pwm signal data, however, it is determined that need to adjust
The brightness of whole currently displaying screen, then determine according to described luminance signal data and described pwm signal data
The brightness of the display screen after adjustment.
Method the most according to claim 3, it is characterised in that described MCU believes according to PWM
Number determines the need for adjusting the brightness of currently displaying screen, however, it is determined that need to adjust currently displaying screen
Brightness, then determine the display screen after adjustment according to described luminance signal data and described pwm signal data
Brightness, including:
Described pwm signal data carried out concentrated collection and be ranked up from big to small, taking intermediate value,
Described intermediate value is compared with maximum PWM threshold value, minimum PWM threshold value, it is judged that described
Pwm signal data are the most effective；
If described pwm signal data are effective, then obtain the effective centre in described pwm signal data
The difference of effective intermediate value in value and a upper cycle；
If described difference is not more than predetermined deviation value, it is determined that described PWM value, without adjusting, remains current
The brightness of display screen；
If described difference is more than predetermined deviation value, it is determined that described PWM value has adjustment, according to default public affairs
Formula calculates the brightness of the display screen after adjusting；
Wherein, described preset formula is: the brightness of the display screen after change=described luminance signal data *
Pwm signal data/current period during high level in current period.
5. according to method described in Claims 1-4 any one, it is characterised in that described MCU root
Determine the need for adjusting the brightness of currently displaying screen according to described pwm signal data, however, it is determined that need to adjust
The brightness of whole currently displaying screen, then determine according to described luminance signal data and described pwm signal data
After the brightness of the display screen after adjustment, also include:
Extract the Local dimming data in the luminance signal in each district after adjusting, by described Local
Dimming data are converted to the register value of the subregion constant current driving device of correspondence；
The communication write brightness to the constant current driving device in each district successively by described SPI communication agreement
Value.
6. the device controlling dim signal, it is characterised in that described device includes:
Acquisition module, the PWM that the luminance signal data sent for obtaining T_con plate sends with mainboard
Signal data, described luminance signal data is for describing the brightness letter in each district of subregion constant current driving device
Number, described luminance signal data is Tong Bu with the luminance signal of described subregion constant current driving device；
Determine module, for determining the need for adjusting currently displaying screen according to described pwm signal data
Brightness, however, it is determined that need to adjust the brightness of currently displaying screen, then according to described luminance signal data and institute
State pwm signal data and determine the brightness of the display screen after adjustment.
Device the most according to claim 6, it is characterised in that described acquisition module, is used for:
Obtain the described luminance signal data that described T_con plate is sent by SIP communication protocol.
Device the most according to claim 6, it is characterised in that described device also includes:
Initialization module, for obtaining luminance signal data and the PWM of T_con plate at described MCU
Before signal data, initialize described T_con, described mainboard and described MCU；
Judge module, believes with PWM for obtaining the luminance signal data of T_con plate at described MCU
After number, it is judged that whether described luminance signal data and described pwm signal data are correct number
According to；If described luminance signal data and described pwm signal data are correct data, then perform described
Determine module.
Device the most according to claim 8, it is characterised in that described determine module, is used for:
Described pwm signal data carried out concentrated collection and be ranked up from big to small, taking intermediate value,
Described intermediate value is compared with maximum PWM threshold value, minimum PWM threshold value, it is judged that described
Pwm signal data are the most effective；
If described pwm signal data are effective, then obtain the effective centre in described pwm signal data
The difference of effective intermediate value in value and a upper cycle；
If described difference is not more than predetermined deviation value, it is determined that described PWM value, without adjusting, remains current
The brightness of display screen；
If described difference is more than predetermined deviation value, it is determined that described PWM value has adjustment, according to default public affairs
Formula calculates the brightness of the display screen after adjusting；
Wherein, described preset formula is: the brightness of the display screen after change=described luminance signal data *
Pwm signal data/current period during high level in current period.
10. according to the device described in claim 6 to 9 any one, it is characterised in that described device
Also include:
Modular converter, for determining the need for adjusting according to described pwm signal data at described MCU
The brightness of whole currently displaying screen, however, it is determined that need to adjust the brightness of currently displaying screen, then according to described bright
After degree signal data and described pwm signal data determine the brightness of the display screen after adjustment, extract and adjust
Local dimming data in the luminance signal in each district after whole, by described Local dimming
Data are converted to the register value of the subregion constant current driving device of correspondence；
Writing module, for by described SPI communication agreement successively to the constant current driving device in each district
Communication write brightness value.
11. 1 kinds of systems controlling dim signal, it is characterised in that described system includes MCU, T_con
Plate, mainboard and subregion constant current driving device；
Described MCU, for obtaining luminance signal data and the transmission of described mainboard that T_con plate sends
Pwm signal data, described luminance signal data is for describing each district of subregion constant current driving device
Luminance signal, described luminance signal data is Tong Bu with the luminance signal of described subregion constant current driving device；Root
Determine the need for adjusting the brightness of currently displaying screen according to described pwm signal data, however, it is determined that need to adjust
The brightness of whole currently displaying screen, then determine according to described luminance signal data and described pwm signal data
The brightness of the display screen after adjustment；
Described T_con plate, for believing by the brightness of field sync signal with described subregion constant current driving device
Number synchronizes, and sends the luminance signal data of described subregion constant current driving device to described MCU；
Described mainboard, for sending pwm signal data to described MCU；
Described subregion constant current driving device, each district after receiving the adjustment that described MCU sends
Luminance signal.
12. systems according to claim 11, it is characterised in that described subregion constant-current driving fills
Multiple constant-current driven chips in putting are connected by predetermined manner, and described predetermined manner is: data signal by
First chip input, is exported described data signal to second chip by described first chip, then
Being exported to the 3rd chip by described second chip, the rest may be inferred, by last chip by described number
The number of it is believed that exports to master chip, and joins end to end.
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