CN108039152B - Backlight driving control method, apparatus and computer-readable storage medium - Google Patents
Backlight driving control method, apparatus and computer-readable storage medium Download PDFInfo
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- CN108039152B CN108039152B CN201711344014.5A CN201711344014A CN108039152B CN 108039152 B CN108039152 B CN 108039152B CN 201711344014 A CN201711344014 A CN 201711344014A CN 108039152 B CN108039152 B CN 108039152B
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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
Abstract
The invention provides a backlight driving control method, which comprises the following steps: when an image playing instruction is received, acquiring an image to be played according to the image playing instruction, and acquiring the required brightness of a backlight partition according to the image to be played; comparing the required brightness with preset full-white-field brightness to obtain a brightness comparison result, and calculating a drive current and a current duty ratio according to the brightness comparison result and the required brightness; and carrying out drive control on the LEDs of the backlight subarea according to the drive current and the current duty ratio. The present invention also provides a backlight driving control apparatus and a computer-readable storage medium. When the invention is used for driving control, the photoelectric parameters of the full white field are taken as algorithm demarcation points, and a sectional control algorithm is adopted, so that the driving control parameters can be dynamically adjusted according to the actual display requirements, the driving control algorithm is optimized, and the energy consumption is effectively reduced.
Description
Technical Field
The present invention relates to the field of backlight technologies, and in particular, to a backlight driving control method, a device, and a computer-readable storage medium.
Background
At present, liquid crystal televisions are widely used, and occupy more and more important positions in daily life of people, and energy consumed by the liquid crystal televisions also attracts more and more attention. Because the backlight source is the largest energy consumer, the power consumption of the backlight is reduced, and the power consumption of the whole machine is also greatly reduced. The Local Dimming backlight time-sharing driving circuit of the liquid crystal television plays a very important role in improving the density of backlight light sources and reducing the driving cost. For the time-sharing driving scheme of the backlight time-sharing driving circuit, the amplitude of the LED driving current is usually larger than that of the LED driven by the common driver; in general, the current amplitude of the N-path time-sharing driving circuit is approximately equal to N times of the direct current driving LED current; therefore, the HDR maximum current amplitude of the time-sharing driving circuit will be larger.
The common driving ABL automatic brightness adjusting method adopts a single current amplitude to work (namely the maximum HDR current amplitude), then linearly calculates the duty ratio according to the signal brightness requirement, and carries out driving control according to the current amplitude and the duty ratio; when the ABL calculation is performed by using a large current (HDR) and the driving control is performed, the electro-optical efficiency of the LED is inevitably reduced, so that the overall power consumption is improved.
Disclosure of Invention
The invention mainly aims to provide a backlight driving control method, backlight driving control equipment and a computer readable storage medium, and aims to solve the technical problem that an automatic brightness adjustment scheme of time-sharing Local Dimming driving is high in power consumption.
In order to achieve the above object, the backlight driving control method is applied to a backlight time-sharing driving circuit, and includes the steps of:
when an image playing instruction is received, acquiring an image to be played according to the image playing instruction, and acquiring the required brightness of a backlight partition according to the image to be played;
comparing the required brightness with preset full-white-field brightness to obtain a brightness comparison result, and calculating a drive current and a current duty ratio according to the brightness comparison result and the required brightness;
and carrying out drive control on the LEDs of the backlight subarea according to the drive current and the current duty ratio.
Optionally, each LED channel of the backlight time-sharing driving circuit is provided with a separate current setting register,
the step of comparing the required brightness with the preset full white field brightness to obtain a brightness comparison result, and calculating the duty ratio of the driving current and the current according to the brightness comparison result and the required brightness comprises the following steps:
comparing the required brightness with a preset full white field brightness, and judging the magnitude relation between the required brightness and the preset full white field brightness;
and if the required brightness is less than or equal to the preset full white field brightness, determining the driving current of the required brightness according to a full white field current value corresponding to the preset full white field brightness, and acquiring a corresponding current duty ratio according to a preset brightness formula, the required brightness and the driving current.
Optionally, after the step of comparing the required brightness with a preset full white field brightness and determining a magnitude relationship between the required brightness and the preset full white field brightness, the method further includes:
and if the required brightness is greater than the preset full white field brightness, acquiring a current duty ratio according to the color bit depth of the image to be played, and acquiring a corresponding driving current according to the preset brightness formula, the required brightness and the current duty ratio.
Optionally, each LED channel of the backlight time-sharing driving current shares one current setting register,
the step of comparing the required brightness with the preset full white field brightness to obtain a brightness comparison result, and calculating the duty ratio of the driving current and the current according to the brightness comparison result and the required brightness comprises the following steps:
comparing the required brightness with a preset full white field brightness, and judging the magnitude relation between the required brightness and the preset full white field brightness;
and if the required brightness is less than or equal to the preset full white field brightness, determining the driving current of the required brightness according to a full white field current value corresponding to the preset full white field brightness, and acquiring a corresponding current duty ratio according to a first duty ratio formula, the required brightness and the driving current.
Optionally, after the step of comparing the required brightness with a preset full white field brightness and determining a magnitude relationship between the required brightness and the preset full white field brightness, the method further includes:
if the required brightness is larger than the preset full white field brightness, determining the driving current of the required brightness according to a preset HDR window current amplitude, and obtaining a corresponding current duty ratio according to a second duty ratio formula, the required brightness, the color bit depth of the image to be played, the preset full white field brightness and the HDR brightness corresponding to the preset HDR window current amplitude.
Further, to achieve the above object, the present invention also provides a backlight driving control device including a processor, a memory, and a backlight driving control program stored on the memory and executable by the processor, wherein the backlight driving control program, when executed by the processor, implements the steps of:
when an image playing instruction is received, acquiring an image to be played according to the image playing instruction, and acquiring the required brightness of a backlight partition according to the image to be played;
comparing the required brightness with preset full-white-field brightness to obtain a brightness comparison result, and calculating a drive current and a current duty ratio according to the brightness comparison result and the required brightness;
and carrying out drive control on the LEDs of the backlight subarea according to the drive current and the current duty ratio.
Optionally, when executed by the processor, the backlight driving control program further implements the following steps:
comparing the required brightness with a preset full white field brightness, and judging the magnitude relation between the required brightness and the preset full white field brightness;
and if the required brightness is less than or equal to the preset full white field brightness, determining the driving current of the required brightness according to a full white field current value corresponding to the preset full white field brightness, and acquiring a corresponding current duty ratio according to a preset brightness formula, the required brightness and the driving current.
Optionally, when executed by the processor, the backlight driving control program further implements the following steps:
and if the required brightness is greater than the preset full white field brightness, acquiring a current duty ratio according to the color bit depth of the image to be played, and acquiring a corresponding driving current according to the preset brightness formula, the required brightness and the current duty ratio.
Optionally, when executed by the processor, the backlight driving control program further implements the following steps:
comparing the required brightness with a preset full white field brightness, and judging the magnitude relation between the required brightness and the preset full white field brightness;
and if the required brightness is less than or equal to the preset full white field brightness, determining the driving current of the required brightness according to a full white field current value corresponding to the preset full white field brightness, and acquiring a corresponding current duty ratio according to a first duty ratio formula, the required brightness and the driving current.
Optionally, when executed by the processor, the backlight driving control program further implements the following steps:
if the required brightness is larger than the preset full white field brightness, determining the driving current of the required brightness according to a preset HDR window current amplitude, and obtaining a corresponding current duty ratio according to a second duty ratio formula, the required brightness, the color bit depth of the image to be played, the preset full white field brightness and the HDR brightness corresponding to the preset HDR window current amplitude.
Further, to achieve the above object, the present invention also provides a computer readable storage medium having a backlight driving control program stored thereon, which when executed by a processor, implements the steps of the backlight driving control method as described above.
According to the invention, when an image playing instruction is received, an image to be played is obtained according to the image playing instruction, and the required brightness of a backlight partition is obtained according to the image to be played; comparing the required brightness with preset full-white-field brightness to obtain a brightness comparison result, and calculating a drive current and a current duty ratio according to the brightness comparison result and the required brightness; and carrying out drive control on the LEDs of the backlight subarea according to the drive current and the current duty ratio. Through the mode, when the driving control is carried out, the photoelectric parameters of the full white field are taken as algorithm demarcation points, the sectional control algorithm is adopted, and different driving current values and current duty ratios are set according to different required brightness of the image to be displayed, so that the driving control parameters can be dynamically adjusted according to the actual display requirement, the driving control algorithm is optimized, and the energy consumption is effectively reduced; meanwhile, due to the adjustability of the driving current, the reliability of circuit devices such as LEDs can be enhanced, the service life of the circuit devices is prolonged, and the driving control cost is saved.
Drawings
Fig. 1 is a schematic diagram of a hardware structure of a backlight driving control device according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a driving control method according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of a backlight time-sharing driving circuit according to the embodiment shown in FIG. 2;
fig. 4 is a schematic view of a refining process of comparing the required brightness with a preset full white field brightness to obtain a brightness comparison result and calculating a duty ratio of a driving current and a current according to the brightness comparison result and the required brightness in fig. 2;
fig. 5 is a schematic view of a refining process of comparing the required brightness with a preset full white field brightness to obtain a brightness comparison result, and calculating a duty ratio of a driving current and a current according to the brightness comparison result and the required brightness in fig. 2.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The main idea of the embodiment scheme of the invention is as follows: when an image playing instruction is received, acquiring an image to be played according to the image playing instruction, and acquiring the required brightness of a backlight partition according to the image to be played; comparing the required brightness with preset full-white-field brightness to obtain a brightness comparison result, and calculating a drive current and a current duty ratio according to the brightness comparison result and the required brightness; and carrying out drive control on the LEDs of the backlight subarea according to the drive current and the current duty ratio.
Referring to fig. 1, fig. 1 is a schematic diagram of a hardware structure of a backlight driving control device according to an embodiment of the present invention.
As shown in fig. 1, the backlight driving control apparatus of the embodiment of the present invention may include a processor 1001 (e.g., a CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used for realizing connection communication among the components; the user interface 1003 includes a Display (Display), an input unit such as a Keyboard (Keyboard); the network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface); the memory 1005 may be a high-speed RAM memory, or may be a non-volatile memory (e.g., a magnetic disk memory), and optionally, the memory 1005 may be a storage device independent of the processor 1001.
Those skilled in the art will appreciate that the hardware configuration depicted in FIG. 1 is not intended to be limiting of the present invention, and may include more or less components than those shown, or some components in combination, or a different arrangement of components.
With continued reference to fig. 1, the memory 1005 of fig. 1, which is one type of computer storage medium, may include an operating system, a network communication module, and a backlight driving control program.
In the terminal shown in fig. 1, the network communication module is mainly used for connecting a server and performing data communication with the server; and the processor 1001 may call the backlight driving control program stored in the memory 1005 and perform the following operations:
when an image playing instruction is received, acquiring an image to be played according to the image playing instruction, and acquiring the required brightness of a backlight partition according to the image to be played;
comparing the required brightness with preset full-white-field brightness to obtain a brightness comparison result, and calculating a drive current and a current duty ratio according to the brightness comparison result and the required brightness;
and carrying out drive control on the LEDs of the backlight subarea according to the drive current and the current duty ratio.
Further, the processor 1001 may also call a backlight driving control program stored in the memory 1005, and perform the following operations:
comparing the required brightness with a preset full white field brightness, and judging the magnitude relation between the required brightness and the preset full white field brightness;
and if the required brightness is less than or equal to the preset full white field brightness, determining the driving current of the required brightness according to a full white field current value corresponding to the preset full white field brightness, and acquiring a corresponding current duty ratio according to a preset brightness formula, the required brightness and the driving current.
Further, the processor 1001 may also call a backlight driving control program stored in the memory 1005, and perform the following operations:
and if the required brightness is greater than the preset full white field brightness, acquiring a current duty ratio according to the color bit depth of the image to be played, and acquiring a corresponding driving current according to the preset brightness formula, the required brightness and the current duty ratio.
Further, the processor 1001 may also call a backlight driving control program stored in the memory 1005, and perform the following operations:
comparing the required brightness with a preset full white field brightness, and judging the magnitude relation between the required brightness and the preset full white field brightness;
and if the required brightness is less than or equal to the preset full white field brightness, determining the driving current of the required brightness according to a full white field current value corresponding to the preset full white field brightness, and acquiring a corresponding current duty ratio according to a first duty ratio formula, the required brightness and the driving current.
Further, the processor 1001 may also call a backlight driving control program stored in the memory 1005, and perform the following operations:
if the required brightness is larger than the preset full white field brightness, determining the driving current of the required brightness according to a preset HDR window current amplitude, and obtaining a corresponding current duty ratio according to a second duty ratio formula, the required brightness, the color bit depth of the image to be played, the preset full white field brightness and the HDR brightness corresponding to the preset HDR window current amplitude.
Various embodiments of the backlight driving control method of the present invention are proposed based on the hardware structure of the above-described backlight driving control apparatus.
Referring to fig. 2, fig. 2 is a flowchart illustrating a driving control method according to a first embodiment of the present invention.
In this embodiment, the drive control method includes the steps of:
step S10, when an image playing instruction is received, acquiring an image to be played according to the image playing instruction, and acquiring the required brightness of a backlight partition according to the image to be played;
at present, liquid crystal televisions are widely used, and occupy more and more important positions in daily life of people, and energy consumed by the liquid crystal televisions also attracts more and more attention. Because the backlight source is the largest energy consumer, the power consumption of the backlight is reduced, and the power consumption of the whole machine is also greatly reduced. The Local Dimming backlight time-sharing driving circuit (as shown in fig. 3) of the lcd television plays a very important role in increasing the density of the backlight light source and reducing the driving cost. The backlight time-sharing driving circuit shown in fig. 3 includes a driving power supply 10, an LED driving module 20, a control module 30, a plurality of power supply selection switches 40, a plurality of driving switches 50, a current sink a, and a backlight module 60. The driving power supply 10 is used for providing driving voltage for the backlight module 60; the backlight module 60 includes a plurality of LED lamps (which may be arranged in a matrix form) to provide a backlight source for a display screen of a multimedia device such as a television; the LED driving module 20 and the control module 30 may adopt discrete components to form a control circuit or an integrated chip to implement their control functions; the input ends of the power supply selection switches 40 are connected with the driving power supply 10, the output ends are connected with the anodes of the LEDs in a one-to-one correspondence manner, and are switched on/off according to the control signal of the control module 30 so as to control the LED lamps to be switched on/off the power supply; the input terminal of each driving switch 50 is connected to the cathodes of at least two LEDs, and the output terminal of each driving switch 50 is grounded via the current sink a, so that at least two LEDs multiplex one driving switch 50. Of course, in specific implementation, the backlight time-sharing driving circuit may be arranged in other forms.
For the time-sharing driving scheme of the backlight time-sharing driving circuit, the amplitude of the LED driving current is usually larger than that of the LED driven by the common driver; in general, the current amplitude of the N-path time-sharing driving circuit is approximately equal to N times of the direct current driving LED current; therefore, the HDR maximum current amplitude of the time-sharing driving circuit will be larger. The common driving control method adopts a single current amplitude to work (namely the maximum HDR current amplitude), then linearly calculates the duty ratio according to the signal brightness requirement, and carries out driving control according to the current amplitude and the duty ratio; when a large current (HDR) is used for calculation and driving control, the electro-optical efficiency of the LED is inevitably reduced, thereby improving the overall power consumption. In view of the above, the present embodiment provides a backlight control driving method, which uses the photoelectric parameters of the full white field as algorithm boundary points, and adopts two-stage ABL (Auto Brightness Limiting) to optimize the Brightness calculation algorithm, so as to reduce the energy consumption of the whole device and save the power cost.
Specifically, firstly, determining the photoelectric parameters of the time-sharing Local Dimming drive of the backlight time-sharing drive circuit, including the maximum photoelectric parameter of the full white field, the maximum photoelectric parameter of the HDR window, and the number N of backlight partitions; the maximum photoelectric parameters of the full white field comprise full-field white brightness LF, full-white-field current value IF and full-white-field current duty ratio DF; the maximum photoelectric parameters of the HDR window comprise HDR brightness LW, HDR window current amplitude IW and HDR circuit duty ratio DW. The set of photoelectric parameters can be set according to the actual hardware configuration condition of the driving circuit, and used for calculating the driving control parameters according to the set of photoelectric parameters.
In this embodiment, the control module may include an image processing unit, an ABL calculation unit, and a drive execution unit. When the control module receives an image playing instruction, a corresponding image to be played is obtained according to the image playing instruction, then the image processing unit processes brightness data of the image to be played, and required brightness data X of a Local Dimming backlight partition is calculated and generated. The image processing unit may be an SOC platform of a television chip, a special image processing ASIC, an image algorithm DSP chip, or an FPGA having an image preprocessing function. The required Brightness may be calculated according to a Brightness calculation formula RGB, namely Brightness ═ 0.3 × R +0.59 × G +0.1 × B (where R is red, G is green, and B is blue), or may be calculated according to other methods. When the required brightness data X are obtained, the image processing unit transmits the required brightness data X to the ABL calculating unit through a communication bus so as to calculate the driving control parameters; the communication bus can adopt SPI format, the communication clock frequency can reach 10MHz to improve the data transmission rate and ensure the response rate of drive control, and the communication bus can also adopt other high-speed synchronous communication formats.
Step S20, comparing the required brightness with a preset full white field brightness to obtain a brightness comparison result, and calculating a driving current value and a current duty ratio according to the brightness comparison result and the required brightness;
in this embodiment, when receiving the required luminance data X transmitted by the image processing unit, the ABL calculating unit may calculate the driving control parameter according to the required luminance data X. The ABL calculation unit in this embodiment may adopt a higher-order MCU with more than 32 bits (for example, more than ARM coordinate MO), or may complete related functions through a CPLD or an FPGA. Since the LED is driven and controlled in this embodiment, the driving control parameters mainly include a driving current I and a current duty ratio D (the current duty ratio refers to a ratio of the energization time to the total time in one pulse cycle).
In the embodiment, when the drive control parameters are calculated, the photoelectric parameters of the full white field are taken as algorithm demarcation points, and two-stage calculation is adopted; firstly, comparing the required brightness X with the preset full white field brightness LF, obtaining a brightness comparison result according to the size relation of the required brightness X and the preset full white field brightness LF, then selecting different calculation formulas according to the brightness comparison result, and substituting the required brightness X and related photoelectric parameters into the calculation formulas to calculate and obtain a driving current value I and a current duty ratio D. Because the drive control parameters (the drive current value I and the current duty ratio D) are calculated by a two-section ABL algorithm, the drive current value and the current duty ratio can be set to different values according to different required brightness of an image to be displayed (instead of uniformly setting the drive current to a fixed value) in the whole drive control process, so that the drive control algorithm is optimized, and the energy consumption is effectively reduced.
In this embodiment, when the driving current value I and the current duty ratio D are obtained through calculation, the ABL calculation unit transmits the driving control data to the driving execution unit through a communication bus (such as an SPI format) to perform driving control.
And step S30, performing driving control on the LEDs of the backlight partition according to the driving current and the current duty ratio.
In this embodiment, when receiving the driving control data (including the driving current value I and the current duty ratio D), the driving execution unit performs logical mapping on the LED backlight partitions according to the driving control data, and drives and controls the LEDs of each backlight partition to operate according to the driving current value I and the current duty ratio. The driving execution unit can be an integrated constant current driving chip comprising an internal MOS, or can be a constant current driving chip and an external MOS.
It should be noted that, for the constant current driving chip, each LED channel current may be set individually (i.e., each LED channel may have an individual current setting register), or a current setting register may be shared by a plurality of LED channels. When different circuit configurations are adopted, the ABL algorithm, the calculation formula selected in step S20 will be changed accordingly.
In the embodiment, when an image playing instruction is received, an image to be played is obtained according to the image playing instruction, and the required brightness of a backlight partition is obtained according to the image to be played; comparing the required brightness with preset full-white-field brightness to obtain a brightness comparison result, and calculating a drive current and a current duty ratio according to the brightness comparison result and the required brightness; and carrying out drive control on the LEDs of the backlight subarea according to the drive current and the current duty ratio. Through the mode, when the driving control is carried out, the photoelectric parameters of the full white field are taken as algorithm demarcation points, the sectional control algorithm is adopted, different driving current values and different current duty ratios are set according to different required brightness of the image to be displayed, so that the driving control parameters can be dynamically adjusted according to the actual display requirement, the driving control algorithm is optimized, and the energy consumption is effectively reduced; meanwhile, due to the adjustability of the driving current, the reliability of circuit devices such as LEDs can be enhanced, the service life of the circuit devices is prolonged, and the driving control cost is saved.
Referring to fig. 4, fig. 4 is a schematic diagram of a refining process of comparing the required brightness with a preset full white field brightness to obtain a brightness comparison result, and calculating a duty ratio of a driving current and a current according to the brightness comparison result and the required brightness as shown in fig. 2.
Based on the foregoing embodiment shown in fig. 2, in this embodiment, each LED channel of the backlight time-sharing driving circuit has a separate current setting register, and step S20 includes:
step S21, comparing the required brightness with the preset full white field brightness, and judging the magnitude relation between the required brightness and the preset full white field brightness;
in this embodiment, for the constant current driving chip of the ABL calculation unit in the backlight time-sharing driving circuit, each LED channel has an individual current setting register; at this time, the constant current driving chip may be an IWAT7038 chip, or other types of chips may be used. And when receiving the required brightness data X transmitted by the image processing unit, the ABL calculating unit compares the required brightness X with the preset full white field brightness LF, and obtains a brightness comparison result according to the size relationship between the required brightness X and the preset full white field brightness LF.
Step S22, if the required brightness is less than or equal to the preset full white field brightness, determining the driving current of the required brightness according to the full white field current value corresponding to the preset full white field brightness, and obtaining the corresponding current duty ratio according to a preset brightness formula, the required brightness and the driving current;
in this embodiment, IF the required brightness X is less than or equal to the preset full white field brightness LF (X is less than or equal to LF), the driving current I of the required brightness X may be determined according to the full white field current value IF corresponding to the preset full white field brightness LF, and the current amplitude of the driving current I is uniformly set to the full white field current value IF, that is, I is equal to IF. At the moment, the current duty ratio D can be calculated according to a preset brightness formula, required brightness and driving current; the preset brightness formula is X-K1I-F (D); where X is the desired luminance, K1 is the conversion factor (K1 is greater than 0), I is the drive current (I ═ IF), and f (d) is a function of the current duty cycle.
According to the preset brightness formula, substituting the corresponding photoelectric parameters, i.e.The corresponding current duty cycle D may be calculated. It is worth noting that F (D) ≦ 2 for the function F (D) of the current duty cycleB1, where B is the image color bit depth to be played, e.g., for a bit depth of 12 bits, the current duty cycle F (D) ≦ 4095; when X is LF, f (d) is 4095.
Step S23, if the required brightness is greater than the preset full white field brightness, obtaining a current duty ratio according to the color bit depth of the image to be played, and obtaining a corresponding driving current according to the preset brightness formula, the required brightness, and the current duty ratio.
In this embodiment, if the required brightness X is greater than the preset full white field brightness LF (X > LF), the current duty ratio D is obtained according to the color bit depth of the image to be played, that is, f (D) is 2B-1, thereby calculating the current duty cycle. When the current duty ratio D is calculated according to the bit depth of the image to be played, the corresponding driving current I is calculated according to the preset luminance formula X-K1 × I f (D), where IF < I < IW (IW is the HDR window current amplitude, see step S10). The segmentation algorithm of steps S22 and S23 is shown in table 1 below.
TABLE 1 ABL segmentation algorithm with separate current setting registers for each LED channel
Through the manner, the drive control parameters (the drive current value I and the current duty ratio D) in the embodiment are calculated by the two-segment ABL algorithm, so that in the whole drive control process, the drive current value and the current duty ratio can be set to different values according to different required brightness of an image to be displayed (instead of uniformly setting the drive current to a fixed value), thereby optimizing the drive control algorithm and effectively reducing energy consumption.
Referring to fig. 5, fig. 5 is a schematic diagram of a refining process of comparing the required brightness with a preset full white field brightness to obtain a brightness comparison result, and calculating a duty ratio of a driving current and a current according to the brightness comparison result and the required brightness in fig. 2.
Based on the foregoing embodiment shown in fig. 2, in this embodiment, each LED channel of the backlight time-sharing driving current shares one current setting register, and step S20 further includes:
step S24, comparing the required brightness with the preset full white field brightness, and judging the magnitude relation between the required brightness and the preset full white field brightness;
in the embodiment, for a constant current driving chip of an ABL calculating unit in a backlight time-sharing driving circuit, each LED channel shares one current setting register; at this time, the constant current driving chip may be an IWAT7027 chip, or other types of chips may be used. And when receiving the required brightness data X transmitted by the image processing unit, the ABL calculating unit compares the required brightness X with the preset full white field brightness LF, and obtains a brightness comparison result according to the size relationship between the required brightness X and the preset full white field brightness LF.
Step S25, if the required brightness is less than or equal to the preset full white field brightness, determining the driving current of the required brightness according to the full white field current value corresponding to the preset full white field brightness, and obtaining the corresponding current duty ratio according to a first duty ratio formula, the required brightness and the driving current;
in this embodiment, IF the required brightness X is less than or equal to the preset full white field brightness LF (X is less than or equal to LF), the driving current I of the required brightness X may be determined according to the full white field current value IF corresponding to the preset full white field brightness LF, and the current amplitude of the driving current I is uniformly set to the full white field current value IF, that is, I is equal to IF. At this time, for the current duty D, calculation may be performed according to the first duty formula, the required luminance, and the driving current. The first duty ratio formula is
F(D)＝(2B-1)*(X/LF)；
Wherein F (D) is a function of current duty ratio, B is the color bit depth of the image to be played, X is the required brightness, and LF is the full white field brightness. Wherein, when X is LF, F (D) is 2B-1; if the bit depth of the image to be played is 12bit, f (d) is 4095.
Step S26, if the required brightness is greater than the preset full white field brightness, determining a driving current of the required brightness according to a preset HDR window current amplitude, and obtaining a corresponding current duty ratio according to a second duty ratio formula, the required brightness, the color bit depth of the image to be played, the preset full white field brightness, and an HDR brightness corresponding to the preset HDR window current amplitude.
In this embodiment, if the required luminance X is greater than the preset full white field luminance LF (X > LF), the driving current I at this time may be determined according to the HDR window current amplitude IW, and the current amplitude of the driving current I is uniformly set as the HDR window current amplitude IW, that is, I is IW. At this time, for the current duty ratio, calculation may be performed according to a second duty ratio formula, the required brightness, the color bit depth of the image to be played, the preset full white field brightness, and the HDR brightness corresponding to the HDR window current amplitude. The second duty ratio formula is
F(D)＝K2*(2B-1)*(X-LF)/(LW-LF)；
Where f (d) is a function of current duty ratio, K2 is HDR optimized luminance coefficient (K2 is greater than 0), B is color bit depth of an image to be played, X is required luminance, LF is full white field luminance, and LW is HDR luminance. The segmentation algorithm of steps S25 and S26 is shown in table 2 below.
TABLE 2 ABL segmentation algorithm with each LED channel sharing a current setting register
Through the manner, the drive control parameters (the drive current value I and the current duty ratio D) in the embodiment are calculated by the two-segment ABL algorithm, so that in the whole drive control process, the drive current value and the current duty ratio can be set to different values according to different required brightness of an image to be displayed (instead of uniformly setting the drive current to a fixed value), thereby optimizing the drive control algorithm and effectively reducing energy consumption.
The invention also provides a computer readable storage medium.
The computer readable storage medium of the present invention stores a backlight driving control program, and the backlight driving control program, when executed by a processor, implements the steps of the backlight driving control method as described above.
The method for implementing the backlight driving control program when executed may refer to various embodiments of the backlight driving control method of the present invention, and will not be described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A backlight driving control method is applied to a backlight time-sharing driving circuit, and comprises the following steps:
when an image playing instruction is received, acquiring an image to be played according to the image playing instruction, and acquiring the required brightness of a backlight partition according to the image to be played;
comparing the required brightness with preset full-white-field brightness to obtain a brightness comparison result, and calculating a drive current and a current duty ratio according to the brightness comparison result and the required brightness;
driving and controlling the LEDs of the backlight subareas according to the driving current and the current duty ratio;
when each LED channel of the backlight time-sharing drive circuit is provided with an independent current setting register, the required brightness is compared with the preset full-white-field brightness to obtain a brightness comparison result, and the step of calculating the drive current and the current duty ratio according to the brightness comparison result and the required brightness comprises the following steps:
comparing the required brightness with a preset full white field brightness, and judging the magnitude relation between the required brightness and the preset full white field brightness;
if the required brightness is less than or equal to the preset full white field brightness, determining a full white field current value corresponding to the preset full white field brightness as the driving current of the required brightness, and obtaining a corresponding current duty ratio according to a preset brightness formula, the required brightness and the driving current, wherein the preset brightness formula is
X＝K1*I*F(D)
Where X is the desired luminance, K1 is the conversion factor and K1 is greater than 0, I is the drive current, and F (D) is a function of the current duty cycle.
2. The backlight driving control method according to claim 1, wherein after the step of comparing the required brightness with a preset full white field brightness and determining the magnitude relationship between the required brightness and the preset full white field brightness, the method further comprises:
if the required brightness is larger than the preset full white field brightness, acquiring a current duty ratio according to the color bit depth of the image to be played and a preset formula, and acquiring corresponding driving current according to the preset brightness formula, the required brightness and the current duty ratio, wherein the preset formula is
F(D)＝(2B-1)
Wherein, f (d) is a function of the current duty ratio, and B is the color bit depth of the image to be played.
3. The backlight driving control method according to claim 1, wherein when the LED channels of the backlight time-sharing driving current share one current setting register,
the step of comparing the required brightness with the preset full white field brightness to obtain a brightness comparison result, and calculating the duty ratio of the driving current and the current according to the brightness comparison result and the required brightness comprises the following steps:
comparing the required brightness with a preset full white field brightness, and judging the magnitude relation between the required brightness and the preset full white field brightness;
if the required brightness is smaller than or equal to the preset full white field brightness, determining a full white field current value corresponding to the preset full white field brightness as the driving current of the required brightness, and obtaining a corresponding current duty ratio according to a first duty ratio formula, the required brightness and the driving current, wherein the first duty ratio formula is that
F(D)＝(2B-1)*(X/LF)
Wherein, f (d) is a function of the current duty ratio, B is the color bit depth of the image to be played, X is the required brightness, and LF is the full white field brightness.
4. The backlight driving control method according to claim 3, wherein after the step of comparing the required brightness with a preset full white field brightness and determining the magnitude relationship between the required brightness and the preset full white field brightness, the method further comprises:
if the required brightness is larger than the preset full white field brightness, determining a preset HDR window current amplitude as the driving current of the required brightness, and obtaining a corresponding current duty ratio according to a second duty ratio formula, the required brightness, the color bit depth of the image to be played, the preset full white field brightness and the HDR brightness corresponding to the preset HDR window current amplitude, wherein the second duty ratio formula is that
F(D)＝K2*(2B-1)*(X-LF)/(LW-LF)；
Wherein, f (d) is a function of the current duty ratio, K2 is an HDR optimized luminance coefficient and K2 is greater than 0, B is a color bit depth of an image to be played, X is a required luminance, LF is a full white field luminance, and LW is an HDR luminance.
5. A backlight driving control device comprising a processor, a memory, and a backlight driving control program stored on the memory and executable by the processor, wherein the backlight driving control program when executed by the processor implements the steps of:
when an image playing instruction is received, acquiring an image to be played according to the image playing instruction, and acquiring the required brightness of a backlight partition according to the image to be played;
comparing the required brightness with preset full-white-field brightness to obtain a brightness comparison result, and calculating a drive current and a current duty ratio according to the brightness comparison result and the required brightness;
driving and controlling the LEDs of the backlight subareas according to the driving current and the current duty ratio;
when each LED channel of the backlight time-sharing drive circuit corresponding to the backlight drive control device is provided with an independent current setting register, the step of comparing the required brightness with the preset full-white-field brightness to obtain a brightness comparison result, and calculating the drive current and the current duty ratio according to the brightness comparison result and the required brightness comprises the following steps:
comparing the required brightness with a preset full white field brightness, and judging the magnitude relation between the required brightness and the preset full white field brightness;
if the required brightness is less than or equal to the preset full white field brightness, determining a full white field current value corresponding to the preset full white field brightness as the driving current of the required brightness, and obtaining a corresponding current duty ratio according to a preset brightness formula, the required brightness and the driving current, wherein the preset brightness formula is
X＝K1*I*F(D)
Where X is the desired luminance, K1 is the conversion factor and K1 is greater than 0, I is the drive current, and F (D) is a function of the current duty cycle.
6. The backlight drive control device according to claim 5, wherein the backlight drive control program, when executed by the processor, further implements the steps of:
if the required brightness is larger than the preset full white field brightness, acquiring a current duty ratio according to the color bit depth of the image to be played and a preset formula, and acquiring corresponding driving current according to the preset brightness formula, the required brightness and the current duty ratio, wherein the preset formula is
F(D)＝(2B-1)
Wherein, f (d) is a function of the current duty ratio, and B is the color bit depth of the image to be played.
7. The backlight driving control device according to claim 5, wherein the step of comparing the required brightness with a preset full white field brightness to obtain a brightness comparison result and calculating the driving current and the current duty ratio according to the brightness comparison result and the required brightness when the current setting register is shared by the LED channels of the backlight time-sharing driving current corresponding to the backlight driving control device further comprises:
comparing the required brightness with a preset full white field brightness, and judging the magnitude relation between the required brightness and the preset full white field brightness;
if the required brightness is smaller than or equal to the preset full white field brightness, determining a full white field current value corresponding to the preset full white field brightness as the driving current of the required brightness, and obtaining a corresponding current duty ratio according to a first duty ratio formula, the required brightness and the driving current, wherein the first duty ratio formula is that
F(D)＝(2B-1)*(X/LF)
Wherein, F (D) is a function of current duty ratio, B is the color bit depth of the image to be played, X is the required brightness, and LF is the full white field brightness;
if the required brightness is larger than the preset full white field brightness, determining a preset HDR window current amplitude as the driving current of the required brightness, and obtaining a corresponding current duty ratio according to a second duty ratio formula, the required brightness, the color bit depth of the image to be played, the preset full white field brightness and the HDR brightness corresponding to the preset HDR window current amplitude, wherein the second duty ratio formula is that
F(D)＝K2*(2B-1)*(X-LF)/(LW-LF)；
Wherein, f (d) is a function of the current duty ratio, K2 is an HDR optimized luminance coefficient and K2 is greater than 0, B is a color bit depth of an image to be played, X is a required luminance, LF is a full white field luminance, and LW is an HDR luminance.
8. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a backlight drive control program which, when executed by a processor, implements the steps of the backlight drive control method according to any one of claims 1 to 4.
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| CN111785219B (en) * | 2020-07-30 | 2022-06-10 | 惠州视维新技术有限公司 | LED driving method, display device and readable storage medium |
| CN117292653B (en) * | 2023-09-28 | 2024-04-09 | 北京显芯科技有限公司 | Data processing method and backlight display system |
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