CN106782361A - The method and device of backlight control signal is generated in liquid crystal display device - Google Patents
The method and device of backlight control signal is generated in liquid crystal display device Download PDFInfo
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- CN106782361A CN106782361A CN201611119512.5A CN201611119512A CN106782361A CN 106782361 A CN106782361 A CN 106782361A CN 201611119512 A CN201611119512 A CN 201611119512A CN 106782361 A CN106782361 A CN 106782361A
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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
- G09G3/36—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 using liquid crystals
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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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Abstract
The present patent application provides a kind of method for producing backlight control signal in liquid crystal display by backlight data.Within the frame backlight data cycle comprising multiple backlight control cycles, backlight data based on multiple target frames, the backlight control signal in several backlight control cycles before last backlight control cycle is generated respectively, and the backlight control signal in last backlight control cycle is generated based on present frame backlight data, so that the backlight flicker problem in reducing the liquid crystal display device that dynamic backlight is controlled.
Description
Technical field
A kind of side the present invention relates to generate backlight control signal in field of liquid crystal display, more particularly to liquid crystal display device
Method and device.
Background technology
In the prior art, as shown in figure 1, liquid crystal display includes：Liquid crystal panel 101, backlight assembly 102, backlight drive
Moving cell 103, graphics processing unit 104 and time schedule controller 105, wherein, backlight driving unit 103 includes backlight processing unit
1301 and pwm driver 1032.Graphics processing unit 104 receives signal of video signal, after its image procossing, output image data
To time schedule controller 105, while exporting synchronizing signal and subregion backlight data to backlight driving unit 103；Backlight processing unit
1031 are based on subregion backlight data, generate duty cycle data and back facet current value, and be delivered to pwm driver 1032；PWM drives
Device 1032 is delivered to backlight assembly 102, backlight assembly according to duty cycle data and back facet current value generation multi-way control signals
102 realize that backlight shows according to multi-way control signals.
As shown in Figure 2 a, in a kind of prior art, the video frame frequency of graphics processing unit treatment is 100Hz/120Hz
Signal, the backlight signal of synchronism output 100Hz/120Hz produces the PWM backlight control signals with frequency to the back of the body to pwm driver
Optical assembly.As shown in Figure 2 b, in another prior art, the video frame frequency of graphics processing unit treatment is 50Hz/60Hz
Signal, also the backlight control signal of synchronism output 50Hz/60Hz is to pwm driver.However, with the backlight control of 50Hz/60Hz
When signal processed drives backlight, human eye can perceive the flicker of backlight, and the backlight data of present frame n and former frame n-1 changes
When larger, backlight flicker can be more obvious.
The content of the invention
It is the backlight flicker problem in the liquid crystal display for reducing dynamic backlight control, the present patent application is provided for liquid
The method and device and liquid crystal display device of backlight control signal are produced in crystal display device by backlight data.
In a first aspect, the application provides a kind of for producing backlight control signal by backlight data in liquid crystal display
Method.Wherein, the backlight data is based on the conversion of image gray-scale level value and backlight illumination, the back of the body needed for for indicating image to show
Optical control signal is used to control backlight illumination, and the method includes：
Configuration multiple backlight control cycles in the present frame backlight data cycle, based on present frame backlight data and former frame or multiframe
The weight sum of backlight data, generates the back of the body in preceding several backlight control cycles in the multiple backlight control cycle respectively
Optical control signal, based on rear some backlight control cycles in the present frame backlight data generation the multiple backlight control cycle
The backlight control signal.
Further, the weight sum based on the present frame backlight data and former frame or multiframe backlight data, generation
Before described during the backlight control signal in several backlight control cycles, the method step specifically also includes：Respectively to described
Present frame backlight data and the former frame or the weight coefficient summation of multiframe backlight data configuration are 1.
Further, when configuring weight coefficient to the present frame backlight data, the first backlight control cycle is small
It is first in the posterior backlight control cycle, and during to the former frame or multiframe backlight data configuration weight coefficient
The backlight control cycle is more than the posterior backlight control cycle.
Further, the method and step of the generation backlight control signal, also includes：Keep in the present frame backlight data
And the former frame or multiframe backlight data, in case generating each backlight control cycle in the present frame backlight data cycle
Described in backlight control signal.
Second aspect, the application provides another for producing backlight control signal by backlight data in liquid crystal display
Method.Wherein, the backlight data is based on the conversion of image gray-scale level value and backlight illumination needed for for indicating image to show, described
Backlight control signal is used to control backlight illumination, and the method includes：
If the frame frequency for receiving current backlight data meets threshold condition, configuration one in the present frame backlight data cycle
The backlight control cycle, and the backlight control signal in the backlight control cycle is generated based on the present frame backlight data；
If the frame frequency for receiving current backlight data is unsatisfactory for threshold condition, the either method step in above-mentioned first aspect is performed
Suddenly.
The third aspect, the application provides a kind of for producing backlight control signal by backlight data in liquid crystal display
Device, including：
Backlight control signal generation module, for configuring multiple backlight control cycles, difference base in the present frame backlight data cycle
In present frame backlight data and the weight sum of former frame or multiframe backlight data, before generating in the multiple backlight control cycle
The backlight control signal in several backlight control cycles, the multiple backlight control is generated based on the present frame backlight data
The backlight control signal in several backlight control cycles after in cycle processed.
Fourth aspect, the application provides another for producing backlight control signal by backlight data in liquid crystal display
Device, including：
Frequency judge module is used for, and judges whether the frame frequency for receiving current backlight data meets threshold condition；
Backlight control signal generation module is used for, if meet threshold condition, configuration in the present frame backlight data cycle
One backlight control cycle, and the backlight control letter in the backlight control cycle is generated based on the present frame backlight data
Number；And,
If be unsatisfactory for threshold condition, configuration multiple backlight control cycles in the present frame backlight data cycle, difference base
In the present frame backlight data and the weight sum of former frame or multiframe backlight data, the multiple backlight control cycle is generated
In preceding several backlight control cycles the backlight control signal, the multiple back of the body is generated based on the present frame backlight data
The backlight control signal in several backlight control cycles after in the photocontrol cycle.
5th aspect, the application also provides a kind of liquid crystal display device, including display screen, memory, processor and storage
On the memory and the computer program that can run on the processor, realized during the computing device said procedure
The either method step of above-mentioned first and second aspect.
Compared with prior art, the Advantageous Effects of the technical scheme that the application is proposed include：
The present patent application provide it is a kind of in liquid crystal display by backlight data produce backlight control signal method and
Configuration multiple backlight control cycles in device, present frame backlight data cycle, respectively to present frame and the back of the body of former frame or multiframe
Light data does not configure weight coefficient, and determines weight sum, and generates the first backlight control cycle based on the weight sum
Backlight control signal；And within the rear backlight control cycle, backlight control signal is generated based on present frame backlight data, with each
The backlight control signal real-time control backlight illumination of generation in cycle.On the one hand, due in one backlight data cycle of present frame
The interior multiple backlight control cycle lifting backlight control frequencies of configuration, on the other hand, due to the back of the body in the first backlight control cycle
Optical control signal is generated by the weight sum of present frame and the backlight data of former frame or multiframe, so, there is provided backlight control is frequently
Simultaneously, the amplitude of backlight control signal seamlessly transits treatment to rate, therefore, it can reduce the liquid crystal display of dynamic backlight control
In backlight flicker problem.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is technology, the accompanying drawing to be used needed for description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is dynamic backlight control schematic diagram in available liquid crystal display device；
Fig. 2 a are the timing diagram of synchronizing signal and backlight brightness data in a kind of liquid crystal display device in the prior art；
Fig. 2 b are the timing diagram of synchronizing signal and backlight brightness data in another liquid crystal display device in the prior art；
Fig. 3 is that one kind of offer in the embodiment of the present application 1 is used to produce backlight control to believe by backlight data in liquid crystal display
Number method corresponding to schematic flow sheet one；
Fig. 4 is the time diagram in present frame backlight data cycle and corresponding backlight control cycle in the embodiment of the present application 1；
Fig. 5 is the time diagram in present frame backlight data period assignment multiple backlight control cycle in the embodiment of the present application 1；
Fig. 6 is two time diagrams in backlight control cycle of present frame backlight data period assignment in the embodiment of the present application 1；
Fig. 7 is two time diagrams in backlight control cycle two of present frame backlight data period assignment in the embodiment of the present application 1；
Fig. 8 a are the time diagram of present frame backlight data cycle interior generation target frame backlight data in the embodiment of the present application 1
One；
Fig. 8 b are the time diagram of present frame backlight data cycle interior generation target frame backlight data in the embodiment of the present application 1
Two；
Fig. 9 is the first the backlight data change schematic diagram under the frequency multiplication of synchronizing signal 2 output in the embodiment of the present application 1；
Figure 10 is second backlight data change schematic diagram under the frequency multiplication of synchronizing signal 2 output in the embodiment of the present application 1；
Figure 11 is a kind of backlight data change schematic diagram under the frequency multiplication of synchronizing signal 4 output in the embodiment of the present application 1；
Figure 12 is the first LCD device backlight subregion division schematic diagram in the embodiment of the present application 1；
Figure 13 is second LCD device backlight subregion division schematic diagram in the embodiment of the present application 1；
Figure 14 is the third backlight data change schematic diagram under the frequency multiplication of synchronizing signal 2 output in the embodiment of the present application 1；
Figure 15 is used to produce backlight control by backlight data in liquid crystal display for another provided in the embodiment of the present application 2
Schematic flow sheet two corresponding to the method for signal；
Figure 16 is a kind of time diagram in present frame backlight data period assignment backlight control cycle in the embodiment of the present application 2；
Figure 17 is generation backlight control in a kind of liquid crystal display device for backlight dynamic control of offer in the embodiment of the present application 3
The device of signal processed；
Figure 18 is used to produce backlight control by backlight data in liquid crystal display for another provided in the embodiment of the present application 4
The device of signal；
Figure 19 is the liquid crystal display device schematic diagram of offer in the embodiment of the present application 5.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is purged, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of invention, rather than whole embodiments.Based on this
Embodiment in invention, the every other reality that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example is applied, the scope of the present invention is belonged to.
Below, the technical scheme shown in the application is described in detail by specific embodiment.It should be noted that under
These specific embodiments of face can be combined with each other, may be in certain embodiments for same or analogous concept or process
Repeat no more.
Embodiment 1
The embodiment of the present application provides a kind of method for producing backlight control signal in liquid crystal display by backlight data.Should
Method is applied in the liquid crystal display shown in Fig. 1, wherein, executive agent can be processor, can also be with treatment
In the backlight control part of device function, such as：Backlight processing unit 1031.
Fig. 3 is that one kind of offer in the embodiment of the present application is used to produce backlight control by backlight data in liquid crystal display
Schematic flow sheet corresponding to the method for signal.As shown in figure 3, the method is comprised the following steps：
In step S210, present frame backlight data to former frame or multiframe backlight data is obtained, the backlight data is based on image
Grey decision-making is changed and backlight illumination needed for for indicating image to show.
Generally, with 4bit, R, G, B three primary colours of 6bit, 8bit drive LCDs respectively.The embodiment of the present application with
As a example by 8bit display screens, the display screen can show 256 luminance levels, referred to as 256 GTGs（The excursion of specific grey decision-making
It is 0 ~ 255）, corresponding, the excursion of backlight data is 0 ~ 255, and is corresponded with grey decision-making.For other bits
Number, such as 4bit, 6bit display screen, the scope of its backlight data can change with the change of corresponding grey decision-making, but its base
Produce the process of backlight control signal similar with 8bit display screens in backlight data, do not do herein and excessively repeat.
Specifically, the method that image gray-scale level value changes backlight data, can be based on the grey decision-making average of each pixel of image
Or weighted mean algorithm obtains backlight data, can need to select specific algorithm according to prior art or design, repeat no more.
As shown in figure 1, view data is transmitted as a data frame with backlight data, when graphics processing unit 104 sends
When one frame image data is to time schedule controller 105, a frame backlight data can be simultaneously emitted by backlight processing unit 1031, at backlight
Reason unit 1031 processes the backlight data, and then generates the backlight control signal represented with dutycycle.Therefore, present frame refers to,
Under present case, the frame data frame that backlight processing unit is being processed.
Similar, former frame refers to, before backlight processing unit processes present frame, last frame number that just treatment terminates
According to frame；A later frame refers to that backlight processing unit processes terminate after present frame, the first frame data frame that will be processed.
Exemplary, as shown in figure 4, data frame n represents present frame, then data frame n-1 represents former frame, data frame n+1
Represent a later frame.
In step S220, in configuration multiple backlight control cycles, be based respectively on present frame in the present frame backlight data cycle
Backlight data and former frame or the weight sum of multiframe backlight data, generate preceding several backlights in the plurality of backlight control cycle
The backlight control signal of controlling cycle, rear backlight control is all in generating the plurality of backlight control cycle based on present frame backlight data
The backlight control signal of phase.
Wherein, backlight control signal is the PWM backlight control signals represented with dutycycle, for controlling backlight illumination, is shown
Example, the PWM backlight control signals can provide drive signal for pwm driver, to start the opening and closing of LED light source, LED
The light source opening time is backlight illumination in the backlight control cycle with the integration of brightness.
Present frame backlight data cycle and backlight control cycle are defined individually below.
The present frame backlight data cycle refers to that backlight processing unit receives present frame backlight data, next to receiving
The time interval cycle of frame backlight data.Exemplary, as shown in figure 4, present frame backlight data cycle T 2 is represented, receive and work as
Time interval between the time point T21 of previous frame n to the time point T22 for receiving a later frame n+1, T2=T22-T21.
Accordingly, in the PWM backlight control signals that generation is represented with dutycycle, a backlight control cycle is expressed as
Adjacent high level and low level continue total time in PWM backlight control signals.Exemplary, as shown in figure 4, in present frame backlight
In data cycle T 2, backlight processing unit receives present frame n, and the backlight data based on present frame n, generation backlight control week
In phase t2, the PWM backlight control signals represented with dutycycle.
In the embodiment of the present application, the multiple backlight control cycle is can configure in the present frame backlight data cycle.In the plurality of back of the body
In the photocontrol cycle in preceding several backlight control cycles, any backlight control cycle is based on present frame and former frame or multiframe
The weight sum of backlight data generates the backlight control signal in backlight control cycle.
It is exemplary, as shown in figure 5, in present frame backlight data cycle T 3 four backlight control cycle t1 of configuration, t2,
T3 and t4.Wherein, backlight control cycle t4 be present frame backlight data cycle T 3 in last backlight control cycle, t1,
T2 and t3 represent 3 backlight control cycles before last backlight control cycle t4.
In first backlight control cycle t1, present frame n and former frame n-1 or multiframe weight coefficient are respectively configured, calculated
Its first weight sum, the backlight control signal in backlight control cycle t1 is generated based on the first weight sum；Second backlight
In controlling cycle t2, present frame n and former frame n-1 or multiframe weight coefficient are configured again, calculate its second weight sum, base
The backlight control signal in backlight control cycle t2, and same method generation backlight control cycle are generated in the second weight sum
The backlight control signal of t3.
And, in last backlight control cycle t4, backlight data generation backlight control cycle t4 based on present frame n
Backlight control signal.Can also, in most latter two backlight control cycle t3 and t4, it is based respectively on the backlight number of present frame n
According to generation backlight control cycle and the backlight control signal of t3 and t4.
Further, when two backlight signal controlling cycles are embodied in multiple backlight control cycles, then step
S220 is specifically included：Weight sum based on present frame and former frame or multiframe produces the backlight control in previous backlight control cycle
Signal processed, the latter backlight control signal in backlight control cycle is produced based on present frame backlight data.
It is exemplary, as shown in fig. 6, in present frame backlight data cycle T 4 two backlight control cycle t5 of configuration and
t6.Wherein, backlight control cycle t5 is the previous backlight control cycle, and t6 represents latter backlight control cycle.
In backlight control cycle t5, configuration present frame n and former frame n-1 or multiframe weight coefficient, calculate its weight it
With the backlight control signal based on weight sum generation backlight control cycle t5；In backlight control cycle t6, based on current
The backlight data of frame n generates the backlight control signal in backlight control cycle t6.
Further, the weight sum based on present frame and former frame or multiframe, in generation backlight control signal, weight it
The determination of sum has two kinds of situations.In the case of the first, the weight sum based on present frame Yu former frame backlight data generates backlight
Control signal；In the case of second, the weight sum based on present frame with preceding multiframe backlight data generates backlight control signal.
Exemplary, as shown in fig. 7, in the first weight sum determination process, based on present frame n and former frame n-1
The weight sum of backlight data, generates the backlight control signal in backlight control cycle t；In second weight sum determination process
In, the weight sum based on present frame n Yu front cross frame n-1 and n-2 backlight data generates the backlight control in backlight control cycle t
Signal.
In the prior art, within the present frame backlight data cycle, backlight processing unit is received and caching present frame backlight
Data, to present frame backlight data process and after output duty cycle and current data, then, the next frame backlight data cycle
Interior reception and caching next frame backlight data, when the next frame backlight data is cached, formerly caching backlight data frame can be automatically clear
Remove.
, it is necessary to the backlight data of present frame and former frame or multiframe is kept in the embodiment of the present application, so as to current
In the frame backlight data cycle, it is available for extracting present frame and former frame or the backlight data of multiframe, and determine its weight sum.
Exemplary, as shown in fig. 7, determining the weight sum of present frame n and former frame n-1, then need temporary present frame n's
Backlight data and former frame n-1 backlight datas.
Further, multiple backlight control cycle, configuration process concrete mode are can configure in the present frame backlight data cycle
It is as follows：
In the generating process of backlight control signal, based on present frame and former frame or multiframe backlight data, N times of present frame is generated
The multiframe target backlight data of frame frequency, wherein, based on present frame and former frame or multiframe backlight data weight sum, generate this many
Preceding some frame target backlight datas in frame, and based on some frame target backlight datas after the generation of present frame backlight data, by new
The multiframe target backlight data of generation generates the backlight control signal in multiple backlight control cycles respectively.
Exemplary, as shown in Figure 8 a, in present frame backlight data cycle T 3, based on present frame n and former frame n-1,
4 frame target backlight datas of the frequency multiplication of generation present frame n backlight datas 4, including：New1, New2, New3 and n, wherein, the first frame
The weight sum that target backlight data New1 is based on present frame n and former frame n-1 is generated, target backlight data New2, New3 point
Not Ji Yu the weight sum of present frame n and former frame n-1 generate, and target backlight data n is generated by present frame backlight data.
Generate the backlight control of backlight control cycle t1, t2, t3 and t4 respectively according to target frame backlight data New1, New2, New3 and n
Signal processed.
And as in Fig. 8 b, in present frame backlight data cycle T 4, based on present frame n and former frame n-1, generation is current
2 frame target backlight datas of the frequency multiplication of frame n backlight datas 2, including：New1 and n.Wherein, the first frame target backlight data New1 bases
Generated in the weight sum of present frame n and former frame n-1, and target backlight data n is generated by present frame backlight data.According to
Target frame backlight data New1 and n generate the backlight control signal of backlight control cycle t5 and t6 respectively.
Specifically, when target frame backlight data is calculated, it is necessary to respectively to present frame and former frame or multiframe backlight data
Configuration weight coefficient.Exemplary, the weight coefficient of each frame configuration is Wi, then the summation of weight coefficient Wi meets number for 1, i.e. Wi
Relation W1+W2+ ...+Wi=1.And then ensure target frame backlight data, the numerical value in present frame Yu the backlight data of former frame
In interval, so that the backlight data change curve of present frame, target frame and former frame is smoother.
Further, it is the weight coefficient of present frame backlight data configuration, the first back of the body in each target frame backlight data
The photocontrol cycle is less than the posterior backlight control cycle, and to the weight coefficient that former frame or multiframe backlight data are configured,
The first backlight control cycle is more than the posterior backlight control cycle.
Exemplary, with present frame and the weight sum of preceding N frames backlight data, M target frame backlight data is generated, and then
Process based on target frame backlight data generation backlight control signal is specifically described.
Present frame and preceding N frames backlight data are respectively L0, L1 ... LN.Within the present frame backlight data cycle, generation first
During individual target frame backlight data, weight coefficient W0 is respectively configured to present frame and preceding N frames backlight data1、W11…WN1, then first
Individual target frame backlight data LA=L0* W01+L1* W11+…+ LN* WN1, based on LAFirst back of the body in backlight control cycle of generation
Optical control signal.
Similar, during generation m-th target frame backlight data, weight is respectively configured to present frame and preceding N frames backlight data
Coefficient W0M、W1M…WNM, then m-th target frame backlight data LM= L0* W0M+L1* W1M+…+ LN* WNM, and then based on LM
The backlight control signal in m-th backlight control cycle is generated, and, last backlight is generated based on present frame backlight data L0
The backlight control signal of controlling cycle.
Wherein, present frame and the weight coefficient of preceding N frames configuration meet relation：
W01<W02<…<W0M； W11>W12>…>W1M； WN1>WN2>…>WNM。
Below, the different value conditions to M and N are illustrated.
As M=1 and N=1, according to present frame and former frame backlight data, a frame target frame backlight data is determined.Such as Fig. 8 b
It is shown, a target frame New1 is generated between present frame n and former frame n-1, then target frame New1 backlight datas L=L0*W0+
L1*W1, wherein L0 are the backlight data of present frame n, and L1 is the backlight data of former frame n-1, and W0 is the weight for configuring present frame n
Coefficient, W1 is the weight coefficient for configuring former frame n-1.
Preferably, W0=W1=0.5 can be set, then the backlight data of target frame New1 is equal to present frame n's and former frame n-1
The average value of backlight data.It is equal to the weight coefficient of present frame n and former frame n-1 due to being respectively configured, and then cause target
Frame New1 changes with the backlight data of present frame n, the backlight data change of target frame New1 and former frame n-1 is all more balanced, enters
And cause that the overall variation of backlight data in present frame n to former frame n-1 is more smoothed.
Exemplary, it is described in detail by taking the backlight subarea 1 shown in Fig. 9 as an example.Wherein, the backlight data of present frame n
It is L0=200, the backlight data of former frame n-1 is L1=100, then the backlight data of target frame New1 is L=0.5*100+0.5*
200=150。
In backlight subarea 1, the backlight data based on target frame New1 produces the backlight control in previous backlight control cycle
Signal processed, and the backlight data based on present frame n produces the latter backlight control signal in backlight control cycle.
Similar, the generation process of other backlight subarea backlight control signals is identical with backlight subarea 1 in Fig. 9, herein not
Do and excessively repeat.
Work as M=1, N>When 1, when N=2 as a example by, the backlight data of present frame n is L0, and the weight coefficient of configuration is W0, previous
The backlight data of frame n-1 is L1, and the weight coefficient of configuration is W1, and the backlight data of front cross frame n-2 is L2, the weight coefficient of configuration
Be W2, then backlight data L=L0*W0+L1*W1+L2*W2 of target frame New1.
Exemplary, it is described in detail by taking the backlight subarea 1 in Figure 10 as an example.Wherein, present frame n, former frame n-1 and
The backlight data of front cross frame n-2 is respectively L0=160, L1=120, L2=100, and is respectively configured present frame n, former frame n-1 and preceding
The weight coefficient of two frame n-2 is W0=0.5, W1=0.25, W2=0.25, then the backlight data of target frame New1 is L=160*0.5+
120*0.25+100*0.25=135。
Further, the backlight data based on target frame New1 produces the backlight control letter in previous backlight control cycle
Number, and the backlight data based on present frame n produces the latter backlight control signal in backlight control cycle.
Work as M>It is exemplary when 1, it is described in detail by taking M=3 as an example.As shown in Figure 8 a, the present frame backlight data cycle
4 backlight control signal cycles t1, t2, t3 and t4 are included in T3, then 3 are sequentially generated between present frame n and former frame n-1
Target frame, respectively New1, New2, New3；Based on the backlight data of target frame New1, the backlight in backlight control cycle t1 is generated
Control signal；Based on the backlight data of target frame New2, the backlight control signal in backlight control cycle t2 is generated, based on target frame
The backlight data of New3, generates the backlight control signal in backlight control cycle t3；Based on the backlight data of present frame n, generation is most
The latter backlight control signal of backlight control cycle t4.
Illustrated to simplify, the backlight data of present frame n and former frame n-1 is equal to the backlight data of N=1, i.e. target frame
Weight sum, does further illustration.
Exemplary, the backlight data of present frame n is L0, and the backlight data of former frame n-1 is L1, is respectively configured present frame
N and former frame n-1 weight coefficient W01 and W11, then the backlight data L of target frame New1A=L0*W01+L1*W11.Further,
Weight coefficient W02 and W12 are configured to present frame n and former frame n-1 again, the backlight data of target frame New2 is calculated；Further
, weight coefficient W03 and W13 are configured to present frame n and former frame n-1 for the third time, calculate the backlight data of target frame New3.
Exemplary, it is described in detail by taking backlight subarea in Figure 11 1 as an example.In backlight subarea 1, the back of the body of present frame n
The backlight data L1=100 of light data L0=160, former frame n-1.When calculating the backlight data of target frame New1, present frame n is configured
Weight coefficient W01=0.3, former frame n-1 weight coefficient W11=0.7, then the backlight data L of New1A=L0* W01+L1*W11=
118.When calculating the backlight data of target frame New2, the weight coefficient W01=0.5 of configuration present frame n, former frame n-1 weight coefficients
W11=0.5, then the backlight data L of New2B=L0* W01+L1*W11=130.When calculating the backlight data of target frame New3, configuration
The weight coefficient W01=0.7 of present frame n, former frame n-1 weight coefficient W11=0.3, then the numerical value L of New3C=L0* W01+L1*
W11=142。
Further, if present frame is equal with the backlight data of former frame, the backlight data of target frame is equal to former frame
Backlight data.When the backlight data of target frame is calculated, first present frame can be judged with the backlight data of former frame,
If the backlight data of two frames is equal, directly make the backlight data of target frame equal to the backlight data of former frame.
By increasing this logic judgment, it is ensured that the backlight data of target frame is in the backlight data area of present frame and former frame
While interior, greatly reduce data operation quantity, reduce processor operation time.
Exemplary, as shown in Figure 10, it is described in detail by taking the backlight subarea 4 in Figure 10 as an example.In backlight subarea 4
In, the backlight data L0=25 of present frame n, the backlight data L1=25 of former frame n-1, the backlight data L2=10 of front cross frame n-2,
When determining the backlight data of target frame New1, the weight coefficient difference of present frame n, former frame n-1, front cross frame n-2 is respectively configured
It is W01=0.5, W11=0.25, W21=0.25, if the algorithm be given by the embodiment of the present application, the backlight data L=33 of target frame.
Obviously, calculated by this, the backlight data result of target frame New1 is unreasonable.Therefore, to avoid such result from occurring,
First present frame n can be compared with the backlight data of former frame n-1 and is sentenced before the backlight data of target frame New1 is calculated
It is disconnected, if the backlight data of two frames is equal, the backlight data of target frame New1 is directly made equal to the backlight data of former frame n-1,
That is L=25.
In 8bit display screens, the numerical value for representing backlight data is integer.Accordingly, it would be desirable to the embodiment of the present application
The algorithm for being given is modified, i.e., when the backlight data of target frame is not integer, it is rounded using bracket function, whole with its
Number produces corresponding backlight control signal partly as the backlight data of target frame.
Exemplary, as shown in figure 11, it is described in detail by taking backlight subarea in Figure 11 7 as an example.In backlight subarea 7,
The backlight data L1=255 of the backlight data L0=100 of present frame n, former frame n-1, is respectively configured present frame n and former frame n-1
Weight coefficient W01=0.4, W11=0.6, determine the first weight sum LA=146.5；The power of configuration present frame n and former frame n-1
Weight coefficient W01=0.5, W11=0.5, determine the second weight sum LB=177.5；The weight system of configuration present frame n and former frame n-1
Number W01=0.6, W11=0.4, determine the 3rd weight sum LC=208.5.Wherein, the weight sum of present frame n and former frame n-1
Respectively 146.5,177.5,208.5, its integer part 146,177,208 is taken respectively as target frame New1, New2, New3
Backlight data, and corresponding backlight control signal is generated with this.
Further, be simplify calculate, calculate target frame backlight data during, for backlight subarea in, when
Previous frame and the less situation of backlight data difference of former frame, may be selected the backlight using the backlight data of former frame as target frame
Data, and backlight control signal is generated with the former frame backlight data.
Exemplary, can be with given threshold T, when the difference of adjacent two frames backlight data is more than threshold value T, by the application reality
Apply the backlight data of the algorithm calculating target frame that example is provided；The backlight data of target frame is otherwise made to be equal to former frame backlight data.
Further, backlight area can be pressed different division rules, is divided into multiple equal-sized backlight subareas.
And then different backlight subareas are judged, it is determined that needing to determine target frame backlight data by the algorithm of the embodiment of the present application 1
Backlight subarea.
Exemplary, provide two kinds of backlight subareas and divide illustration.As shown in figure 12, the first backlight subarea divides and shows
Backlight assembly is divided into 16*9 backlight subarea 401 by intention；As shown in figure 13, second backlight subarea divides schematic diagram will carry on the back
Optical assembly is divided into 16*1 backlight subarea 501.
Exemplary, threshold value T=30 is set.As shown in figure 14, in backlight subarea 1, the backlight data of present frame n is L0=
The backlight data of 200, former frame n-1 is L1=100, both differencesL=100, more than threshold value 30, then needs by the application reality
Apply the backlight data that the algorithm that example provides determines target frame New.For another example, in backlight subarea 6, the backlight data of present frame n is L0=
The backlight data of 0, former frame n-1 is L1=20, both differencesL=20, less than threshold value 30, then with the backlight number of former frame n-1
According to the backlight data L=L1=20 of the backlight data as target frame New, i.e. target frame New.
By setting threshold value, different backlight subareas are treated with a certain discrimination, only when adjacent two backlight datas difference is larger, by this
The algorithm that application embodiment is given determines the backlight data of target frame, so as to reduce operand, accelerates arithmetic speed.
Compared with prior art, the Advantageous Effects of the technical scheme that the embodiment of the present application is proposed include：
The present patent application provides the method that backlight control signal is produced by backlight data, within the present frame backlight data cycle, leads to
Cross and obtain present frame and former frame or the backlight data of multiframe, be respectively configured each frame weight coefficient, determine present frame and former frame
Or the first weight sum of multiframe, and first backlight control letter in backlight control cycle is generated based on the first weight sum
Number；And then, present frame and former frame or multiframe weight coefficient are respectively configured again, ask for the second weight sum, and based on this
Two weight sums generate the backlight control signal in second backlight control cycle, and circulation is up to based on the weight sum according to this
In the generation present frame backlight data cycle, the backlight control in other backlight control cycles before last backlight control cycle
Signal；And the backlight control signal in last backlight control cycle is generated based on present frame backlight data, and then realize working as
Configuration multiple backlight control cycles in the previous frame backlight data cycle.
The method that the present patent application is provided was realized in the present frame backlight data cycle, configuration multiple backlight control weeks
Phase, while before the present frame backlight data generation backlight control signal corresponding backlight control cycle, with present frame and former frame
The weight sum of backlight data generates the backlight control signal in some backlight control cycles, makes in the present frame backlight data cycle
Backlight illumination change is more smooth, so that the backlight flicker problem in reducing the liquid crystal display device that dynamic backlight is controlled.
Embodiment 2
Method of the embodiment of the present application there is provided backlight control signal is produced in another liquid crystal display by backlight data,
Before the method and step of the embodiment of the present application 1 is performed, increase the decision process of backlight data frame frequency.Specifically, as shown in figure 15,
The method step includes：
Step S610, receives the frame frequency of present frame backlight data.
During implementing, executive agent such as processor, receive present frame backlight data frame frequency, and with setting threshold
Value is judged, according to judged result execution different instruction.
Step S620, if the frame frequency for receiving current backlight data meets threshold condition, the present frame backlight data cycle
One backlight control cycle of interior configuration, and the backlight control signal in backlight control cycle is generated based on present frame backlight data.
Exemplary, threshold condition can be set to, and the frame frequency of backlight data is more than or equal to 100/120Hz.When backlight data frame
When frequency is at least 100/120Hz, human eye will not perceive the problem of backlight flicker, it is not necessary within the present frame backlight data cycle
Configuration multiple backlight control cycles.
Exemplary, as shown in figure 16, when the frame frequency of backlight data is 100/120Hz, threshold condition is met, current
A backlight control cycle t7 is configured in frame n backlight datas cycle T 5, and the backlight data based on present frame n is generated for controlling
The backlight control signal of backlight control cycle t7.
The method that the embodiment of the present application 2 is provided also includes：Step S630 ~ S640, the S210 that it is given with embodiment 1 ~
S220 method and steps are similar to, and do not do herein and excessively repeat.
Exemplary, threshold condition can be set to, and the frame frequency of backlight data is more than or equal to 100/Hz；When the frame frequency of backlight data
During for 50/60Hz, threshold condition is unsatisfactory for, then performs the either method step in the embodiment of the present application 1, do not repeated herein.
Embodiment 3
The embodiment of the present application provides a kind of device for producing backlight control signal in liquid crystal display by backlight data.Figure
17 is the schematic device of the generation backlight control signal that the embodiment of the present application is provided, and as shown in figure 17, device 700 includes：
Backlight data acquisition module 710, for obtaining present frame backlight data and former frame or multiframe backlight data, the backlight number
Changed and for indicating image to show required backlight illumination according to based on image gray-scale level value；
Backlight control signal generation module 720, for configuring multiple backlight control cycles, base within the present frame backlight data cycle
In present frame backlight data and the weight sum of former frame or multiframe backlight data, generate respectively in the plurality of backlight control cycle
In preceding several backlight control cycles backlight control signal, the plurality of backlight control cycle is generated based on present frame backlight data
In after several backlight control cycles backlight control signal.
The backlight control signal generation module 720 provided in the embodiment of the present application 3, can be also used for performing in the present invention
State example 1 offer liquid crystal display in by backlight data produce backlight control signal method in any technical scheme, its
Realization principle is similar with technique effect, and here is omitted.
Embodiment 4
The embodiment of the present application provides another device for producing backlight control signal in liquid crystal display by backlight data.
As shown in figure 18, the device 800, including：
Whether frequency judge module 810, the frame frequency for judging to receive current backlight data meets threshold condition；
Backlight control signal generation module 820, if for meeting during threshold condition, configuration one in the present frame backlight data cycle
The individual backlight control cycle, and the backlight control signal in backlight control cycle is generated based on present frame backlight data；And,
If be unsatisfactory for threshold condition, in configuration multiple backlight control cycles, be based respectively on and work as in the present frame backlight data cycle
The weight sum of previous frame backlight data and former frame or multiframe backlight data, generate in the plurality of backlight control cycle it is preceding several
The backlight control signal in backlight control cycle, after being generated in the plurality of backlight control cycle based on present frame backlight data several
The backlight control signal in backlight control cycle.
The backlight control signal generation module 820 provided in the embodiment of the present application 4, can be also used for the execution present invention above-mentioned
Any technical scheme in the method for backlight control signal is produced in the liquid crystal display that example 1 is provided by backlight data, in fact
Existing principle is similar with technique effect, and here is omitted.
Embodiment 5
The embodiment of the present application provides a kind of liquid crystal display device, and as shown in figure 19, liquid crystal display device 900 can also include treatment
Device 901, memory 902 and display screen 903, wherein memory 902 are stored with the computer journey that can be run on processor 901
Sequence, and during the execution above computer program of processor 901, realize the step of any technical scheme that the embodiment of the present application 1 or 2 is provided
Rapid method.
Above-described specific embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, should be understood that and the foregoing is only specific embodiment of the invention, be not intended to limit the present invention
Protection domain, all any modification, equivalent substitution and improvements within the spirit and principles in the present invention, done etc. all should include
Within protection scope of the present invention.
Claims (10)
1. it is a kind of in liquid crystal display by backlight data produce backlight control signal method, wherein, the backlight number
According to based on the conversion of image gray-scale level value and for indicating image to show required backlight illumination, the backlight control signal is used to control to carry on the back
Brightness, it is characterised in that the method step includes：
Configuration multiple backlight control cycles in the present frame backlight data cycle, be based respectively on the present frame backlight data with it is previous
The weight sum of frame or multiframe backlight data, generates the institute in preceding several backlight control cycles in the multiple backlight control cycle
Backlight control signal is stated, based on rear several backlight controls in the present frame backlight data generation the multiple backlight control cycle
The backlight control signal in cycle processed.
2. the method for claim 1, it is characterised in that carried on the back based on the present frame backlight data and former frame or multiframe
The weight sum of light data, when generating the backlight control signal in preceding several backlight control cycles, the method step
Specifically also include：The weight coefficient for being configured to the present frame backlight data and the former frame or multiframe backlight data respectively is total
Be 1.
3. method as claimed in claim 2, it is characterised in that generate it is described before several backlight control cycles the back of the body
During optical control signal, the method step specifically also includes：
To the weight coefficient of present frame backlight data configuration, the first backlight control cycle is less than the posterior back of the body
The photocontrol cycle, and to the weight coefficient that the former frame or multiframe backlight data are configured, first backlight control week
Phase is more than the posterior backlight control cycle.
4. the method for claim 1, it is characterised in that the method step also includes：Keep in the present frame backlight number
According to this and the former frame or multiframe backlight data, in case generating each backlight control week in the present frame backlight data cycle
The interim backlight control signal.
5. the method for claim 1, it is characterised in that the method step also includes：The backlight control signal be with
The PWM backlight control signals that dutycycle is represented.
6. the method for claim 1, it is characterised in that the multiple backlight control cycle is specially two backlights
Signal controlling cycle, the method step is specifically included：Produced described in the previous backlight control cycle based on the weight sum
Backlight control signal, the latter backlight control signal in backlight control cycle is produced based on the present frame backlight data.
7. it is a kind of in liquid crystal display by backlight data produce backlight control signal method, wherein, the backlight number
According to based on the conversion of image gray-scale level value and for indicating image to show required backlight illumination, the backlight control signal is used to control to carry on the back
Brightness, it is characterised in that the method step includes：
If the frame frequency for receiving current backlight data meets threshold condition, configuration one in the present frame backlight data cycle
The backlight control cycle, and the backlight control signal in the backlight control cycle is generated based on the present frame backlight data；
If the frame frequency for receiving current backlight data is unsatisfactory for threshold condition, any methods described steps of perform claim requirement 1-6
Suddenly.
8. it is a kind of in liquid crystal display by backlight data produce backlight control signal device, it is characterised in that including：
Backlight control signal generation module, for configuring multiple backlight control cycles in the present frame backlight data cycle, based on working as
Previous frame backlight data and former frame or the weight sum of multiframe backlight data, before generating respectively in the multiple backlight control cycle
The backlight control signal in several backlight control cycles, the multiple backlight control is generated based on the present frame backlight data
The backlight control signal in several backlight control cycles after in cycle processed.
9. it is a kind of in liquid crystal display by backlight data produce backlight control signal device, it is characterised in that including：
Whether frequency judge module, the frame frequency for judging to receive current backlight data meets threshold condition；
Backlight control signal generation module, if for meeting during threshold condition, configuration in the present frame backlight data cycle
One backlight control cycle, and the backlight control letter in the backlight control cycle is generated based on the present frame backlight data
Number；And,
If be unsatisfactory for threshold condition, configuration multiple backlight control cycles in the present frame backlight data cycle, difference base
In the present frame backlight data and the weight sum of former frame or multiframe backlight data, the multiple backlight control cycle is generated
In preceding several backlight control cycles the backlight control signal, the multiple back of the body is generated based on the present frame backlight data
The backlight control signal in several backlight control cycles after in the photocontrol cycle.
10. a kind of liquid crystal display device, including display screen, it is characterised in that：Also include memory, processor and storage described
On memory and the computer program that can run on the processor, it is characterised in that the computing device said procedure
Shi Shixian following steps, the step includes any methods describeds of claim 1-7.
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| PCT/CN2017/096195 WO2018103357A1 (en) | 2016-12-08 | 2017-08-07 | Method and device for generating backlight control signal in liquid crystal display device |
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Application publication date: 20170531 |