CN108039152A - Backlight drive control method, equipment and computer-readable recording medium - Google Patents
Backlight drive control method, equipment and computer-readable recording medium Download PDFInfo
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- CN108039152A CN108039152A CN201711344014.5A CN201711344014A CN108039152A CN 108039152 A CN108039152 A CN 108039152A CN 201711344014 A CN201711344014 A CN 201711344014A CN 108039152 A CN108039152 A CN 108039152A
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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
- 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
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
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Abstract
The present invention provides a kind of backlight drive control method, and this method includes：By the way that when receiving image player instruction, image to be played is obtained according to described image play instruction, and according to the demand brightness of the image acquisition backlight subarea to be played；The demand brightness and default full white brightness are contrasted, obtain brightness ratio pair as a result, and according to the brightness comparison result and demand brightness calculation driving current and current duty cycle；Control is driven to the LED of the backlight subarea according to the driving current and current duty cycle.The present invention also provides a kind of backlight drive control device and computer-readable recording medium.The present invention is when being driven control, by using the photoelectric parameter of complete white field as algorithm separation, using segmented control algolithm, so as to adjust drive control parameter according to actual displayed demand dynamic, the algorithm of drive control is optimized, significantly reduces energy consumption.
Description
Technical field
The present invention relates to back light source technique field, more particularly to a kind of backlight drive control method, equipment and computer can
Read storage medium.
Background technology
At present, the use of LCD TV is more and more extensive, and more and more important position is occupied in daily life,
And the energy of its consumption also increasingly causes the concern of people.Because backlight is the largest energy depleter, backlight is reduced
Power consumption, be also greatly lowered the power consumption of complete machine.Wherein, LCD TV Local Dimming backlights timesharing drive circuit, it is right
In the density for improving back light, reduction driving cost plays the role of very important.For the backlight timesharing drive circuit
Timesharing drive scheme, LED drive current amplitude will be typically larger than the LED current amplitude that commonly drive；Ordinary circumstance, N roads point
When drive circuit current amplitude, be approximately equal to N times of DC driven LED current；Therefore, the maximum electricity of the HDR of timesharing drive circuit
Flowing amplitude will bigger.
Common driving ABL auto brightness methods of adjustment, are using single current amplitude work (as maximum HDR electric currents
Amplitude), then required according to luminance signals, linearly calculate its duty cycle, and carry out according to the current amplitude and duty cycle
Drive control；And when carrying out ABL calculating using high current (HDR) and carrying out drive control, necessarily reduce the electric light effect of LED
Rate, so as to improve overall power.
The content of the invention
It is a primary object of the present invention to propose a kind of backlight drive control method, equipment and computer-readable storage medium
Matter, it is intended to solve the high technical problem of the auto brightness Adjusted Option power consumption of timesharing Local Dimming drivings.
To achieve the above object, the backlight drive control method is applied to backlight timesharing drive circuit, and the backlight is driven
Flowing control method comprises the following steps：
When receiving image player instruction, image to be played is obtained according to described image play instruction, and according to described
The demand brightness of image acquisition backlight subarea to be played；
The demand brightness and default full white brightness are contrasted, obtain brightness ratio pair as a result, and according to described bright
Spend comparison result and demand brightness calculation driving current and current duty cycle；
Control is driven to the LED of the backlight subarea according to the driving current and current duty cycle.
Alternatively, each LED channel of the backlight timesharing drive circuit respectively there is single electric current to set register,
It is described to be contrasted the demand brightness and default full white brightness, brightness ratio pair is obtained as a result, and according to institute
The step of stating brightness comparison result and demand brightness calculation driving current and current duty cycle includes：
The demand brightness and default full white brightness are contrasted, judge that the demand brightness and default complete white field are bright
The magnitude relationship of degree；
If the demand brightness is less than or equal to the default full white brightness, full white brightness pair is preset according to described
The complete white field current value answered determines the driving current of the demand brightness, and according to predetermined luminance formula, the demand brightness and
Driving current obtains corresponding current duty cycle.
Alternatively, it is described by the demand brightness and preset full white brightness contrasted, judge the demand brightness and
After the step of presetting the magnitude relationship of full white brightness, further include：
If the demand brightness is more than the default full white brightness, obtained according to the color locating depth of the image to be played
Obtaining current duty cycle, and corresponding driving electricity is obtained according to the predetermined luminance formula, the demand brightness and current duty cycle
Stream.
Alternatively, each LED channel of the backlight timesharing driving current shares an electric current and sets register,
It is described to be contrasted the demand brightness and default full white brightness, brightness ratio pair is obtained as a result, and according to institute
The step of stating brightness comparison result and demand brightness calculation driving current and current duty cycle includes：
The demand brightness and default full white brightness are contrasted, judge that the demand brightness and default complete white field are bright
The magnitude relationship of degree；
If the demand brightness is less than or equal to the default full white brightness, full white brightness pair is preset according to described
The complete white field current value answered determines the driving current of the demand brightness, and according to the first duty cycle formula, the demand brightness
Corresponding current duty cycle is obtained with driving current.
Alternatively, it is described by the demand brightness and preset full white brightness contrasted, judge the demand brightness and
After the step of presetting the magnitude relationship of full white brightness, further include：
If the demand brightness is more than the default full white brightness, institute is determined according to default HDR window current amplitudes
State the driving current of demand brightness, and according to the second duty cycle formula, the demand brightness, the image to be played colour bits
It is deep, described to preset full white brightness and the corresponding electric current duty of the corresponding HDR luminance acquisitions of the default HDR windows current amplitude
Than.
In addition, to achieve the above object, the present invention also provides a kind of backlight drive control device, the backlight drive control
Equipment includes processor, memory and is stored on the memory and can control journey by the backlight drive that the processor performs
Sequence, wherein backlight drive control program realizes following steps when being performed by the processor：
When receiving image player instruction, image to be played is obtained according to described image play instruction, and according to described
The demand brightness of image acquisition backlight subarea to be played；
The demand brightness and default full white brightness are contrasted, obtain brightness ratio pair as a result, and according to described bright
Spend comparison result and demand brightness calculation driving current and current duty cycle；
Control is driven to the LED of the backlight subarea according to the driving current and current duty cycle.
Alternatively, when the backlight drive control program is performed by the processor, following steps are also realized：
The demand brightness and default full white brightness are contrasted, judge that the demand brightness and default complete white field are bright
The magnitude relationship of degree；
If the demand brightness is less than or equal to the default full white brightness, full white brightness pair is preset according to described
The complete white field current value answered determines the driving current of the demand brightness, and according to predetermined luminance formula, the demand brightness and
Driving current obtains corresponding current duty cycle.
Alternatively, when the backlight drive control program is performed by the processor, following steps are also realized：
If the demand brightness is more than the default full white brightness, obtained according to the color locating depth of the image to be played
Obtaining current duty cycle, and corresponding driving electricity is obtained according to the predetermined luminance formula, the demand brightness and current duty cycle
Stream.
Alternatively, when the backlight drive control program is performed by the processor, following steps are also realized：
The demand brightness and default full white brightness are contrasted, judge that the demand brightness and default complete white field are bright
The magnitude relationship of degree；
If the demand brightness is less than or equal to the default full white brightness, full white brightness pair is preset according to described
The complete white field current value answered determines the driving current of the demand brightness, and according to the first duty cycle formula, the demand brightness
Corresponding current duty cycle is obtained with driving current.
Alternatively, when the backlight drive control program is performed by the processor, following steps are also realized：
If the demand brightness is more than the default full white brightness, institute is determined according to default HDR window current amplitudes
State the driving current of demand brightness, and according to the second duty cycle formula, the demand brightness, the image to be played colour bits
It is deep, described to preset full white brightness and the corresponding electric current duty of the corresponding HDR luminance acquisitions of the default HDR windows current amplitude
Than.
In addition, to achieve the above object, it is described computer-readable the present invention also provides a kind of computer-readable recording medium
Backlight drive control program is stored with storage medium, the backlight drive control program is realized as above-mentioned when being executed by processor
Backlight drive control method the step of.
The present invention by the way that when receiving image player and instructing, image to be played is obtained according to described image play instruction,
And according to the demand brightness of the image acquisition backlight subarea to be played；The demand brightness and default full white brightness are carried out
Contrast, obtains brightness ratio pair as a result, and according to the brightness comparison result and demand brightness calculation driving current and electric current duty
Than；Control is driven to the LED of the backlight subarea according to the driving current and current duty cycle.In the above manner,
The present invention when being driven control, by using it is complete in vain field photoelectric parameter as algorithm separation, using segmented control algolithm, root
Different driving current value and current duty cycle are arranged to according to the difference of image to be displayed demand brightness, so as to according to reality
Border shows demand dynamic adjustment drive control parameter, and the algorithm of drive control is optimized, significantly reduces energy consumption；Together
When due to the adjustability of driving current, can also strengthen the reliability of the circuit devcies such as LED, extend circuit devcie uses the longevity
Life, saves drive control cost.
Brief description of the drawings
Fig. 1 is the hardware architecture diagram for the backlight drive control device that the embodiment of the present invention is related to；
Fig. 2 is the flow diagram of drive control method first embodiment of the present invention；
Fig. 3 is the backlight timesharing drive circuit schematic diagram that embodiment illustrated in fig. 2 is related to；
Fig. 4 by the demand brightness and to preset full white brightness and contrasted described in Fig. 2, obtain brightness ratio pair as a result,
And according to the brightness comparison result and demand brightness calculation driving current and the refinement flow diagram of current duty cycle；
Fig. 5 by the demand brightness and to preset full white brightness and contrasted described in Fig. 2, obtain brightness ratio pair as a result,
And according to the brightness comparison result and demand brightness calculation driving current and the refinement flow diagram of current duty cycle.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The main thought of the embodiment of the present invention is：When receiving image player instruction, played according to described image
Instruction obtains image to be played, and according to the demand brightness of the image acquisition backlight subarea to be played；By the demand brightness
Contrasted with default full white brightness, obtain brightness ratio pair as a result, and according to the brightness comparison result and demand luminance meter
Calculate driving current and current duty cycle；The LED of the backlight subarea is driven according to the driving current and current duty cycle
Dynamic control.
With reference to Fig. 1, Fig. 1 is the hardware architecture diagram for the backlight drive control device that the embodiment of the present invention is related to.
As shown in Figure 1, the backlight drive control device of the embodiment of the present invention can include processor 1001 (such as CPU),
Communication bus 1002, user interface 1003, network interface 1004, memory 1005.Wherein, communication bus 1002 is used for realization this
Connection communication between a little components；User interface 1003 includes that display screen (Display), input unit such as keyboard can be included
(Keyboard)；Network interface 1004 can optionally include standard wireline interface and wireless interface (such as WI-FI interfaces)；Deposit
Reservoir 1005 can be high-speed RAM memory or the memory (non-volatile memory) of stabilization, such as magnetic
Disk storage, memory 1005 optionally can also be the storage device independently of aforementioned processor 1001.
, can be with it will be understood by those skilled in the art that the hardware configuration shown in Fig. 1 does not form limitation of the invention
Including than illustrating more or fewer components, either combining some components or different components arrangement.
With continued reference to Fig. 1, in Fig. 1 as a kind of computer-readable storage medium memory 1005 can include operating system,
Network communication module and backlight drive control program.
In the terminal shown in Fig. 1, network communication module is mainly used for Connection Service device, and carrying out data with server leads to
Letter；And processor 1001 can call the backlight drive stored in memory 1005 to control program, and perform following operation：
When receiving image player instruction, image to be played is obtained according to described image play instruction, and according to described
The demand brightness of image acquisition backlight subarea to be played；
The demand brightness and default full white brightness are contrasted, obtain brightness ratio pair as a result, and according to described bright
Spend comparison result and demand brightness calculation driving current and current duty cycle；
Control is driven to the LED of the backlight subarea according to the driving current and current duty cycle.
Further, processor 1001 may call upon the backlight drive control program stored in memory 1005, and hold
The following operation of row：
The demand brightness and default full white brightness are contrasted, judge that the demand brightness and default complete white field are bright
The magnitude relationship of degree；
If the demand brightness is less than or equal to the default full white brightness, full white brightness pair is preset according to described
The complete white field current value answered determines the driving current of the demand brightness, and according to predetermined luminance formula, the demand brightness and
Driving current obtains corresponding current duty cycle.
Further, processor 1001 may call upon the backlight drive control program stored in memory 1005, and hold
The following operation of row：
If the demand brightness is more than the default full white brightness, obtained according to the color locating depth of the image to be played
Obtaining current duty cycle, and corresponding driving electricity is obtained according to the predetermined luminance formula, the demand brightness and current duty cycle
Stream.
Further, processor 1001 may call upon the backlight drive control program stored in memory 1005, and hold
The following operation of row：
The demand brightness and default full white brightness are contrasted, judge that the demand brightness and default complete white field are bright
The magnitude relationship of degree；
If the demand brightness is less than or equal to the default full white brightness, full white brightness pair is preset according to described
The complete white field current value answered determines the driving current of the demand brightness, and according to the first duty cycle formula, the demand brightness
Corresponding current duty cycle is obtained with driving current.
Further, processor 1001 may call upon the backlight drive control program stored in memory 1005, and hold
The following operation of row：
If the demand brightness is more than the default full white brightness, institute is determined according to default HDR window current amplitudes
State the driving current of demand brightness, and according to the second duty cycle formula, the demand brightness, the image to be played colour bits
It is deep, described to preset full white brightness and the corresponding electric current duty of the corresponding HDR luminance acquisitions of the default HDR windows current amplitude
Than.
Based on the hardware configuration of above-mentioned backlight drive control device, each reality of proposition backlight drive control method of the present invention
Apply example.
With reference to Fig. 2, Fig. 2 is the flow diagram of drive control method first embodiment of the present invention.
In the present embodiment, the drive control method comprises the following steps：
Step S10, when receiving image player instruction, image to be played is obtained according to described image play instruction, and
According to the demand brightness of the image acquisition backlight subarea to be played；
At present, the use of LCD TV is more and more extensive, and more and more important position is occupied in daily life,
And the energy of its consumption also increasingly causes the concern of people.Because backlight is the largest energy depleter, backlight is reduced
Power consumption, be also greatly lowered the power consumption of complete machine.Wherein, LCD TV Local Dimming backlight timesharing drive circuit is (such as
Shown in Fig. 3), the density for improving back light, reduction driving cost plays the role of very important.Shown in Fig. 3
In backlight timesharing drive circuit, including driving power 10, LED drive module 20, control module 30, multiple power supply selecting switch
40th, multiple driving switch 50, current sink A and backlight module 60.Wherein driving power 10 is used to provide driving for backlight module 60
Voltage；Backlight module 60 includes multiple LED light (form that can be arranged to matrix), with for the aobvious of the multimedia equipments such as television set
Display screen provides back light；LED drive module 20 and control module 30 can use discrete component composition control circuit or collection
Its control function is realized into chip；It is multiple power supply selecting switch 40 input terminals be connected with driving power 10, output terminal with respectively
The anode of LED connects one to one, and according to the control signal ON/OFF of control module 30, to control LED light to access/move back
Go out power supply；Cathode of the input terminal of each driving switch 50 at least with two LED is connected, the output terminal warp of each driving switch 50
Current sink A is grounded, so that at least two LED are multiplexed a driving switch 50.Certainly in specific implementation, backlight timesharing is driven
Dynamic circuit can be arranged to other forms.
For the timesharing drive scheme of the backlight timesharing drive circuit, LED drive current amplitude will be typically larger than and commonly drive
Dynamic LED current amplitude；Ordinary circumstance, the current amplitude of N roads timesharing drive circuit, is approximately equal to N times of DC driven LED electricity
Stream；Therefore, the HDR maximum current amplitudes of timesharing drive circuit will bigger.Common drive control method, is to use single electric current
Amplitude work (being maximum HDR current amplitudes), then requires according to luminance signals, linearly calculates its duty cycle, and
Control is driven according to the current amplitude and duty cycle；And work as and calculated using high current (HDR) and carry out drive control
When, necessarily reduce LED electrical efficiency, so as to improve overall power.In this regard, propose that a kind of backlight control is driven in the present embodiment
Dynamic method, using the photoelectric parameter of complete white field as algorithm separation, using two-part ABL (Auto Brightness
Limiting, auto brightness adjustment calculate), optimize brightness calculation algorithm, so as to reach reduction energy consumption, save power supply into
This.
Specifically, firstly the need of the photoelectricity ginseng for determining that the timesharing Local Dimming of the backlight timesharing drive circuit drive
Number, including complete white field maximum photoelectric parameter, HDR window maximum photoelectric parameters, backlight subarea number N；Wherein complete white field maximum light
Electrical parameter includes whole audience white luminance LF, complete white field current value IF, complete white field current duty cycle DF；HDR window maximum photoelectric parameters
Including HDR brightness LW, HDR window current amplitude IW, HDR circuit duty cycles DW.Can be according to drive for this group of photoelectric parameter
What the actual hardware configuring condition of dynamic circuit was configured, by being driven according to this group of photoelectric parameter based on control parameter
Calculate.
In the present embodiment, control module can include image processing unit, ABL computing units, driving execution unit.Control
Module will instruct according to the image player when receiving image player instruction and obtain corresponding image to be played, then by scheming
Picture processing unit carries out brightness data processing to the image to be played, and calculates the need of generation Local Dimming backlight subareas
Seek brightness data X.Wherein, can be the SOC platform of television set chip, special image procossing for image processing unit
ASIC, image algorithm dsp chip or there is FPGA of image preprocessing etc..And for the calculating of the demand brightness, can
To be to be calculated that (wherein R is red, G according to the brightness calculation formula Brightness=0.3*R+0.59*G+0.1*B of RGB
For green, B is blueness), naturally it is also possible to it is the demand brightness data X that image to be played is calculated according to other methods.Obtaining
During demand brightness data X, these demand brightness data X can be delivered to ABL by communication bus and calculate list by image processing unit
Member, to be driven the calculating of control parameter；The form of SPI can be wherein used for communication bus, communication clock frequency is reachable
To 10MHz, to improve message transmission rate, ensure the speed of response of drive control, certain communication bus can also use other
High-speed synchronous communication format.
Step S20, by the demand brightness and presets full white brightness and is contrasted, obtain brightness ratio pair as a result, simultaneously root
According to the brightness comparison result and demand brightness calculation driving current value and current duty cycle；
In the present embodiment, ABL computing units are when receiving the demand brightness data X of image processing unit transmission, you can
The calculating of control parameter is driven according to demand brightness data X.ABL computing units in the present embodiment can use high-order
More than 32 MCU (such as more than ARM CORTEX MO), CPLD or FPGA can also be passed through and complete relevant function.Due to
It is that control is driven to LED in the present embodiment, therefore drive control parameter mainly includes driving current I and current duty cycle D
(current duty cycle refers in a pulse cycle, and conduction time is relative to the ratio shared by total time).
In the present embodiment, when calculating drive control parameter, by using the photoelectric parameter of complete white field as algorithm separation, use
Two-part calculates；Demand brightness X and default full white brightness LF are contrasted first, obtained according to both magnitude relationships bright
Comparison result is spent, then selects different calculation formula further according to the brightness comparison result, and by demand brightness X and relevant light
Electrical parameter, which is substituting in the calculation formula, is calculated driving current value I and current duty cycle D.Since drive control parameter (is driven
Streaming current value I and current duty cycle D) it is to be calculated by the ABL algorithms of two-part, therefore during whole drive control,
Driving current value and current duty cycle can be arranged to according to the difference of the demand brightness of image to be displayed different value (without
It is that driving current is uniformly arranged to fixed value), so that the algorithm of drive control be optimized, effectively reduce energy consumption.
In the present embodiment, when driving current value I and current duty cycle D is calculated, ABL computing units will pass through communication
Bus (such as SPI forms) these drive control datas are transferred to driving execution unit, to be driven control.
Step S30, control is driven according to the driving current and current duty cycle to the LED of the backlight subarea.
In the present embodiment, driving execution unit is receiving drive control data (including driving current value I and electric current duty
Than D) when, LED backlight subregion will be completed in logical mappings, and drive control each backlight subarea according to the drive control data
LED works according to driving current value I and current duty cycle.Can include built-in MOS wherein for driving execution unit
Integrated form constant-current driven chip or including constant-current driven chip and external MOS.
What deserves to be explained is for constant-current driven chip, each LED channel electric current can be separately provided (i.e. each LED
Passage can have single electric current to set register) or multiple LED channels share electric current and register be set.
When using different circuit structures, ABL algorithms, calculation formula selected in step S20 will also change accordingly.
In the present embodiment, when receiving image player instruction, image to be played is obtained according to described image play instruction,
And according to the demand brightness of the image acquisition backlight subarea to be played；The demand brightness and default full white brightness are carried out
Contrast, obtains brightness ratio pair as a result, and according to the brightness comparison result and demand brightness calculation driving current and electric current duty
Than；Control is driven to the LED of the backlight subarea according to the driving current and current duty cycle.In the above manner,
The present embodiment is when being driven control, by using the photoelectric parameter of complete white field as algorithm separation, using segmented control algolithm,
Different driving current value and current duty cycle are arranged to according to the difference of image to be displayed demand brightness, so as to basis
Actual displayed demand dynamic adjustment drive control parameter, is optimized the algorithm of drive control, significantly reduces energy consumption；
Simultaneously because the adjustability of driving current, can also strengthen the reliability of the circuit devcies such as LED, extend circuit devcie uses the longevity
Life, saves drive control cost.
With reference to Fig. 4, Fig. 4 obtains brightness ratio to be contrasted the demand brightness and default full white brightness described in Fig. 2
Pair as a result, and being illustrated according to the brightness comparison result and demand brightness calculation driving current and the refinement flow of current duty cycle
Figure.
Based on above-mentioned embodiment illustrated in fig. 2, in the present embodiment, each LED channel of backlight timesharing drive circuit has respectively
Single electric current sets register, and step S20 includes：
Step S21, the demand brightness and default full white brightness are contrasted, and are judged the demand brightness and are preset
The magnitude relationship of full white brightness；
In the present embodiment, for the constant-current driven chip of ABL computing units in backlight timesharing drive circuit, each LED leads to
Road respectively there is single electric current to set register；At this time, for the constant-current driven chip, IWAT7038 chips can be selected,
Other type chips can certainly be used.ABL computing units are receiving the demand brightness data X of image processing unit transmission
When, demand brightness X and default full white brightness LF are contrasted, brightness comparison result is obtained according to both magnitude relationships.
Step S22, if the demand brightness is less than or equal to the default full white brightness, according to described default complete white
The corresponding complete white field current value of field brightness determines the driving current of the demand brightness, and according to predetermined luminance formula, the need
Brightness and driving current is asked to obtain corresponding current duty cycle；
, can be according to default if demand brightness X, which is less than or equal to, presets full white brightness LF (X≤LF) in the present embodiment
The corresponding complete white field current value IF of white brightness LF determine the driving current I of demand brightness X entirely, by the electric current width of driving current I
Primary system one is set as complete white field current value IF, i.e. I=IF., can be according to predetermined luminance formula, need at this point for current duty cycle D
Brightness and driving current is asked to be calculated；Predetermined luminance formula is X=K1*I*F (D)；Wherein X is demand brightness, and K1 is conversion
Coefficient (K1 is more than 0), I are driving current (I=IF), and F (D) is the function of current duty cycle.
According to the predetermined luminance formula, corresponding photoelectric parameter is substituted into, you can corresponding current duty cycle is calculated
D.What deserves to be explained is for the function F (D) of the current duty cycle, F (D)≤2B- 1, wherein B are color of image position to be played
It is deep, such as locating depth 12bit, current duty cycle F (D)≤4095；As X=LF, F (D)=4095.
Step S23, if the demand brightness is more than the default full white brightness, according to the face of the image to be played
Color bits obtains current duty cycle deeply, and is obtained and corresponded to according to the predetermined luminance formula, the demand brightness and current duty cycle
Driving current.
In the present embodiment, if demand brightness X, which is more than, presets full white brightness LF (X ＞ LF), according to the figure to be played
The color locating depth of picture obtains current duty cycle D, i.e. F (D)=2B- 1, so as to calculate current duty cycle.According to figure to be played
When the locating depth of picture calculates current duty cycle D, corresponding driving electricity is calculated further according to predetermined luminance formula X=K1*I*F (D)
Flow I, at this time IF ＜ I ＜ IW (IW is HDR window current amplitudes, specific visible step S10).The segmentation of step S22 and step S23
Algorithm is as shown in table 1 below.
1 each LED channel of table has the ABL segmentation algorithms that single electric current sets register respectively
By the above-mentioned means, the drive control parameter (driving current value I and current duty cycle D) in the present embodiment is by two
The ABL algorithms of segmentation are calculated, therefore during whole drive control, driving current value and current duty cycle can bases
The difference of the demand brightness of image to be displayed and be arranged to different values (rather than driving current is uniformly arranged to fixed value),
So as to which the algorithm of drive control be optimized, energy consumption is effectively reduced.
With reference to Fig. 5, Fig. 5 obtains brightness ratio to be contrasted the demand brightness and default full white brightness described in Fig. 2
Pair as a result, and being illustrated according to the brightness comparison result and demand brightness calculation driving current and the refinement flow of current duty cycle
Figure.
Based on above-mentioned embodiment illustrated in fig. 2, in the present embodiment, each LED channel of backlight timesharing driving current shares one
Electric current sets register, and step S20 is further included：
Step S24, the demand brightness and default full white brightness are contrasted, and are judged the demand brightness and are preset
The magnitude relationship of full white brightness；
In the present embodiment, for the constant-current driven chip of ABL computing units in backlight timesharing drive circuit, each LED channel
Share an electric current and register is set；At this time, for the constant-current driven chip, IWAT7027 chips can be selected, also may be used certainly
To use other type chips.ABL computing units, need to when receiving the demand brightness data X of image processing unit transmission
Seek brightness X and preset full white brightness LF and contrasted, brightness comparison result is obtained according to both magnitude relationships.
Step S25, if the demand brightness is less than or equal to the default full white brightness, according to described default complete white
The corresponding complete white field current value of field brightness determines the driving current of the demand brightness, and according to the first duty cycle formula, described
Demand brightness and driving current obtain corresponding current duty cycle；
, can be according to default if demand brightness X, which is less than or equal to, presets full white brightness LF (X≤LF) in the present embodiment
The corresponding complete white field current value IF of white brightness LF determine the driving current I of demand brightness X entirely, by the electric current width of driving current I
Primary system one is set as complete white field current value IF, i.e. I=IF.At this point for current duty cycle D, can according to the first duty cycle formula,
Demand brightness and driving current are calculated.First duty cycle formula is
F (D)=(2B-1)*(X/LF)；
Wherein F (D) is the function of current duty cycle, and B is color of image locating depth to be played, and X is demand brightness, and LF is complete white
Field brightness.Wherein, as X=LF, F (D)=2B-1；If the locating depth 12bit, F (D)=4095 of image to be played at this time.
Step S26, if the demand brightness is more than the default full white brightness, according to default HDR window electric current width
Value determines the driving current of the demand brightness, and according to the second duty cycle formula, the demand brightness, the image to be played
Color locating depth, it is described preset full white brightness and the corresponding HDR luminance acquisitions of the default HDR windows current amplitude it is corresponding
Current duty cycle.
, can be according to HDR window electric currents if demand brightness X, which is more than, presets full white brightness LF (X ＞ LF) in the present embodiment
Amplitude IW determines driving current I at this time, the current amplitude of driving current I is uniformly set as HDR window current amplitude IW, i.e.,
I=IW.At this point for current duty cycle, can according to the second duty cycle formula, demand brightness, image to be played color locating depth,
Preset full white brightness and the corresponding HDR brightness calculations of HDR window current amplitudes.Second duty cycle formula is
F (D)=K2* (2B-1)*(X-LF)/(LW-LF)；
Wherein F (D) is the function of current duty cycle, and K2 optimizes luminance factor (K2 is more than 0) for HDR, and B is image to be played
Color locating depth, X are demand brightness, and LF is full white brightness, and LW is HDR brightness.The segmentation algorithm of step S25 and step S26 are such as
Shown in table 2 below.
2 each LED channel of table shares the ABL segmentation algorithms that an electric current sets register
By the above-mentioned means, the drive control parameter (driving current value I and current duty cycle D) in the present embodiment is by two
The ABL algorithms of segmentation are calculated, therefore during whole drive control, driving current value and current duty cycle can bases
The difference of the demand brightness of image to be displayed and be arranged to different values (rather than driving current is uniformly arranged to fixed value),
So as to which the algorithm of drive control be optimized, energy consumption is effectively reduced.
The present invention also provides a kind of computer-readable recording medium.
Backlight drive control program is stored with computer-readable recording medium of the present invention, the backlight drive controls program
When being executed by processor, realize such as the step of above-mentioned backlight drive control method.
Wherein, backlight drive control program is performed realized method and can refer to backlight drive control method of the present invention
Each embodiment, details are not described herein again.
It should be noted that herein, term " comprising ", "comprising" or its any other variant are intended to non-row
His property includes, so that process, method, article or system including a series of elements not only include those key elements, and
And other elements that are not explicitly listed are further included, or further include as this process, method, article or system institute inherently
Key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that including this
Also there are other identical element in the process of key element, method, article or system.
The embodiments of the present invention are for illustration only, do not represent the quality of embodiment.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can add the mode of required general hardware platform to realize by software, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on such understanding, technical scheme substantially in other words does the prior art
Going out the part of contribution can be embodied in the form of software product, which is stored in one as described above
In storage medium (such as ROM/RAM, magnetic disc, CD), including some instructions use so that a station terminal equipment (can be mobile phone,
Computer, server, air conditioner, or network equipment etc.) perform method described in each embodiment of the present invention.
It these are only the preferred embodiment of the present invention, be not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow shift that bright specification and accompanying drawing content are made, is directly or indirectly used in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of backlight drive control method, it is characterised in that the backlight drive control method drives applied to backlight timesharing
Circuit, the backlight drive control method comprise the following steps：
When receiving image player instruction, image to be played is obtained according to described image play instruction, and wait to broadcast according to described
Put the demand brightness of image acquisition backlight subarea；
The demand brightness and default full white brightness are contrasted, obtain brightness ratio pair as a result, and according to the brightness ratio
To result and demand brightness calculation driving current and current duty cycle；
Control is driven to the LED of the backlight subarea according to the driving current and current duty cycle.
2. backlight drive control method as claimed in claim 1, it is characterised in that the backlight timesharing drive circuit it is each
LED channel respectively there is single electric current to set register,
It is described to be contrasted the demand brightness and default full white brightness, brightness ratio pair is obtained as a result, and according to described bright
The step of degree comparison result and demand brightness calculation driving current and current duty cycle, includes：
The demand brightness and default full white brightness are contrasted, the demand brightness is judged and presets full white brightness
Magnitude relationship；
It is corresponding according to the default full white brightness if the demand brightness is less than or equal to the default full white brightness
Complete white field current value determines the driving current of the demand brightness, and according to predetermined luminance formula, the demand brightness and driving
Electric current obtains corresponding current duty cycle.
3. backlight drive control method as claimed in claim 2, it is characterised in that described by the demand brightness and default complete
White brightness is contrasted, and judges that the demand brightness with after the step of magnitude relationship for presetting full white brightness, further includes：
If the demand brightness is more than the default full white brightness, electricity is obtained according to the color locating depth of the image to be played
Duty cycle is flowed, and corresponding driving current is obtained according to the predetermined luminance formula, the demand brightness and current duty cycle.
4. backlight drive control method as claimed in claim 1, it is characterised in that the backlight timesharing driving current it is each
LED channel shares an electric current and sets register,
It is described to be contrasted the demand brightness and default full white brightness, brightness ratio pair is obtained as a result, and according to described bright
The step of degree comparison result and demand brightness calculation driving current and current duty cycle, includes：
The demand brightness and default full white brightness are contrasted, the demand brightness is judged and presets full white brightness
Magnitude relationship；
It is corresponding according to the default full white brightness if the demand brightness is less than or equal to the default full white brightness
Complete white field current value determines the driving current of the demand brightness, and according to the first duty cycle formula, the demand brightness and drive
Streaming current obtains corresponding current duty cycle.
5. backlight drive control method as claimed in claim 4, it is characterised in that described by the demand brightness and default complete
White brightness is contrasted, and judges that the demand brightness with after the step of magnitude relationship for presetting full white brightness, further includes：
If the demand brightness is more than the default full white brightness, the need are determined according to default HDR window current amplitudes
Seek the driving current of brightness, and according to the second duty cycle formula, the demand brightness, the image to be played color locating depth,
It is described to preset full white brightness and the corresponding current duty cycle of the corresponding HDR luminance acquisitions of the default HDR windows current amplitude.
A kind of 6. backlight drive control device, it is characterised in that the backlight drive control device include processor, memory and
It is stored on the memory and program can be controlled by the backlight drive that the processor performs, wherein the backlight drive controls
Program realizes following steps when being performed by the processor：
When receiving image player instruction, image to be played is obtained according to described image play instruction, and wait to broadcast according to described
Put the demand brightness of image acquisition backlight subarea；
The demand brightness and default full white brightness are contrasted, obtain brightness ratio pair as a result, and according to the brightness ratio
To result and demand brightness calculation driving current and current duty cycle；
Control is driven to the LED of the backlight subarea according to the driving current and current duty cycle.
7. backlight drive control device as claimed in claim 6, it is characterised in that the backlight drive control program is described
When processor performs, following steps are also realized：
The demand brightness and default full white brightness are contrasted, the demand brightness is judged and presets full white brightness
Magnitude relationship；
It is corresponding according to the default full white brightness if the demand brightness is less than or equal to the default full white brightness
Complete white field current value determines the driving current of the demand brightness, and according to predetermined luminance formula, the demand brightness and driving
Electric current obtains corresponding current duty cycle.
8. backlight drive control device as claimed in claim 7, it is characterised in that the backlight drive control program is described
When processor performs, following steps are also realized：
If the demand brightness is more than the default full white brightness, electricity is obtained according to the color locating depth of the image to be played
Duty cycle is flowed, and corresponding driving current is obtained according to the predetermined luminance formula, the demand brightness and current duty cycle.
9. backlight drive control device as claimed in claim 6, it is characterised in that the backlight drive control program is described
When processor performs, following steps are also realized：
The demand brightness and default full white brightness are contrasted, the demand brightness is judged and presets full white brightness
Magnitude relationship；
It is corresponding according to the default full white brightness if the demand brightness is less than or equal to the default full white brightness
Complete white field current value determines the driving current of the demand brightness, and according to the first duty cycle formula, the demand brightness and drive
Streaming current obtains corresponding current duty cycle；
If the demand brightness is more than the default full white brightness, the need are determined according to default HDR window current amplitudes
Seek the driving current of brightness, and according to the second duty cycle formula, the demand brightness, the image to be played color locating depth,
It is described to preset full white brightness and the corresponding current duty cycle of the corresponding HDR luminance acquisitions of the default HDR windows current amplitude.
10. a kind of computer-readable recording medium, it is characterised in that backlight drive is stored with the computer-readable recording medium
Dynamic control program, the backlight drive control program are realized as any one of claim 1 to 5 when being executed by processor
The step of backlight drive control method.
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