CN113838429A - Backlight driving method and system - Google Patents
Backlight driving method and system Download PDFInfo
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- CN113838429A CN113838429A CN202111123524.6A CN202111123524A CN113838429A CN 113838429 A CN113838429 A CN 113838429A CN 202111123524 A CN202111123524 A CN 202111123524A CN 113838429 A CN113838429 A CN 113838429A
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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
- G09G3/3413—Details of control of colour illumination sources
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention discloses a backlight driving method and a system, wherein the backlight driving system comprises: the device comprises a processing module and a driving module; the driving module is connected with the processing module; the processing module is used for receiving the dimming signal and the periodic signal; synchronously outputting a dimming signal and a periodic pulse signal to the driving module according to the dimming signal and the periodic signal; and the driving module is used for sampling the dimming signal according to the periodic pulse signal and outputting dimming current for dimming according to a sampling result. The invention can avoid that the drive module can not accurately identify the change of the dimming signal and the period of the current dimming signal when the dimming signal is sampled, and ensure the sampling accuracy of the drive module, thereby stably dimming the screen and avoiding dimming and flashing the screen.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a backlight driving method and system.
Background
An existing LCD (Liquid Crystal Display) product depends on a Light-Emitting Diode (LED) backlight to emit Light, and the dimming mode thereof is mainly divided into DC dimming and PWM (Pulse width modulation) dimming. The DC dimming is a technology for adjusting the brightness by directly controlling the current on the two sides of the light-emitting component, and when the current on the two sides of the LED backlight plate is small, the brightness is correspondingly reduced; the PWM dimming is a technology for controlling brightness by rapidly switching on and off a screen light source, and when the switching speed is faster, screen flicker is also accelerated, and when the frequency of switching on and off the light source exceeds the limit of human eyes, the brightness information of all pictures is mutually superimposed in human eyes, and at this time, the speed of the frequency only affects the brightness of the screen. Because PWM adjusts luminance through quick scintillation, even if people's eye can't perceive the picture change of switching process, but can respond to this phenomenon from the physiology, frequent scintillation more easily causes fatigue to the muscle on both sides of eyes to stimulate the dioptric system to link, accelerate the ageing of eyesight. Therefore, currently, backlight-driven DC dimming is gradually replacing PWM dimming.
However, when the prior art performs DC dimming, when the dimming frequency is switched from a high frequency to a low frequency, the high level and the period cannot be accurately sampled, and the backlight current may generate sudden change to cause flicker.
Disclosure of Invention
In view of the above problems, the present invention provides a backlight driving method and system, which can avoid that the driving module cannot accurately identify the change of the dimming signal and the period of the current dimming signal when sampling the dimming signal, and ensure the sampling accuracy of the driving module, thereby stably dimming the screen and avoiding dimming and flashing the screen.
In a first aspect, the present application provides the following technical solutions through an embodiment:
a backlight driving system, comprising: the device comprises a processing module and a driving module; the driving module is connected with the processing module;
the processing module is used for receiving a dimming signal and a periodic signal; synchronously outputting a dimming signal and a periodic pulse signal to the driving module according to the dimming signal and the periodic signal; the driving module is used for sampling the dimming signal according to the periodic pulse signal and outputting dimming current for dimming according to a sampling result.
Optionally, the processing module includes a data registering unit, a data converting unit and a sending unit;
the data registering unit is used for storing the dimming signal; the data conversion unit is used for converting the periodic signal into a periodic pulse signal; the sending unit is used for synchronously outputting the dimming signal and the periodic pulse signal to the driving module according to the initial characteristic of the periodic pulse signal; the start feature characterizes a start of a period of the periodic pulse signal.
Optionally, the starting feature is a first rising edge of the periodic pulse signal;
the sending unit is further specifically configured to output the dimming signal and the periodic pulse signal to the driving module synchronously according to a first rising edge of the periodic pulse signal.
Optionally, the sampling result includes a first counting result and a second counting result; the driving module comprises a signal sampling unit, a period sampling unit, an arithmetic unit and a conversion output unit;
the signal sampling unit is used for counting the dimming signals and obtaining a first counting result of the current period; the periodic sampling unit is used for counting the periodic pulse signals to obtain a second counting result of the current period; the arithmetic unit is used for processing the first counting result and the second counting result to obtain the duty ratio of the current period; and the conversion output unit is used for outputting dimming current used for dimming in the current period according to the duty ratio.
Optionally, the signal sampling unit is specifically configured to count the dimming signal according to a starting characteristic of a periodic pulse signal, so as to obtain the first count result; the start feature characterizes the start of one period of the periodic pulse signal; the periodic sampling unit is used for counting the periodic pulse signals according to the initial characteristics of the periodic pulse signals to obtain the second counting result.
Optionally, the signal sampling unit is specifically configured to count to 1 when the dimming signal is at a high level in a current period; obtaining the first counting result according to the result that the counting in the dimming signal is 1; the periodic sampling unit is used for counting to be 0 when the periodic pulse signal is at a low level in the current period; and obtaining the second counting result according to the result that the counting in the periodic pulse signal is 0.
Optionally, the operation unit is specifically configured to obtain a duty ratio according to a ratio of the first counting result to the second counting result.
Optionally, the processing module is a TCON chip.
In a second aspect, based on the same inventive concept, the present application provides the following technical solutions through an embodiment:
a backlight driving method applied to the backlight driving system according to any one of the first aspect, the backlight driving method comprising:
the processing module receives a dimming signal and a periodic signal; the processing module synchronously outputs a dimming signal and a periodic pulse signal to the driving module according to the dimming signal and the periodic signal; the driving module samples the dimming signal according to the periodic pulse signal and outputs dimming current for dimming according to a sampling result.
In a third aspect, based on the same inventive concept, the present application provides the following technical solutions through an embodiment:
a backlight driving method applied to the processing module of any of the first aspect, the backlight driving method comprising:
receiving a dimming signal and a periodic signal; and synchronously outputting a dimming signal and a periodic pulse signal to a driving module according to the dimming signal and the periodic signal, so that the driving module samples the dimming signal according to the periodic pulse signal and outputs dimming current for dimming according to a sampling result.
In a fourth aspect, based on the same inventive concept, the present application provides the following technical solutions through an embodiment:
a backlight driving method applied to the driving module of any one of the first aspect, the backlight driving method comprising:
the receiving processing module synchronously outputs a dimming signal and a periodic pulse signal according to the dimming signal and the periodic signal; and sampling the dimming signal according to the periodic pulse signal, and outputting dimming current for dimming according to a sampling result.
The embodiment of the invention provides a backlight driving system and a method thereof, wherein the system comprises: the device comprises a processing module and a driving module; the driving module is connected with the processing module; the processing module is used for receiving a dimming signal and a periodic signal; synchronously outputting a dimming signal and a periodic pulse signal to the driving module according to the dimming signal and the periodic signal; and the driving module is used for sampling the dimming signal according to the periodic pulse signal and outputting dimming current for dimming according to a sampling result. Compared with the prior art, the embodiment of the invention is additionally provided with the processing module, the processing module receives the dimming signal and the periodic signal, converts the dimming signal into the periodic pulse signal and synchronously outputs the periodic pulse signal and the dimming signal to the driving module, and the condition that the driving module cannot accurately identify the change of the dimming signal and the period of the current dimming signal when the dimming signal is sampled is avoided. Therefore, the driving module sampling accuracy is guaranteed by the embodiment, so that the screen is stably dimmed, and dimming and screen flashing are avoided.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts. In the drawings:
FIG. 1 shows a schematic diagram of a splash screen analysis of prior art dimming in an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a backlight driving system according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating the synchronous matching between the dimming signal and the periodic pulse signal in the embodiment of the present invention;
FIG. 4 illustrates a schematic diagram of sampling a dimming signal in an embodiment of the present invention;
FIG. 5 illustrates a schematic diagram of sampling a periodic pulse signal in an embodiment of the present invention;
FIG. 6 is a high level ratio diagram of the dimming signal according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of the structure of a TCON chip according to an embodiment of the invention;
FIG. 8 is a schematic structural diagram of a driver chip according to an embodiment of the present invention;
FIG. 9 is a flow chart of a backlight driving method according to an embodiment of the present invention;
FIG. 10 is a flow chart illustrating another backlight driving method according to an embodiment of the present invention;
fig. 11 is a flowchart illustrating a backlight driving method according to another embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Research personnel analyze the current DC dimming, and find that the front-end module in the prior art is directly connected with the LED drive; the LED drive directly performs calculation and cycle identification on the PWM signal. When the frequency of the PWM signal output by the front-end architecture becomes low, the frequency change cannot be identified by the counting register driven by the LED, and the high-level duration becomes long in the process of converting the high frequency into the low frequency. At the moment, the counting register samples according to the previous period, and the previous period is smaller than the current period, so that the currently acquired data are all high level, the duty ratio is improved to 100% by mistake in LED driving, and the backlight current is suddenly changed to the maximum value. When the low level arrives, the currently collected data are all low level, the backlight current is suddenly changed to be the lowest, and the flicker is generated. It is necessary to wait for a low frequency period to be completely sampled before outputting the correct current, as shown in fig. 1. In fig. 1, since the backlight driving needs to be sampled and operated before being output, the low current continues to be close to two cycles, which results in the output dimming current being delayed by approximately two cycles compared to the PWM signal. In view of this situation, a backlight driving system is provided in the present embodiment to improve the above-mentioned problems, and the inventive concept will be illustrated and described in detail by specific embodiments below.
Referring to fig. 2, in an embodiment of the present invention, a backlight driving system 100 is provided, the backlight driving system 100 includes: a processing module 10 and a driving module 20; the processing module 10 is connected to the front end module 101, and the driving module 20 is connected to the processing module 10.
The front-end module 101 is configured to output the dimming signal and the periodic signal to the processing module 10. For example, when the system is applied to a mobile phone, the front-end module 101 may be a module capable of generating a dimming signal according to ambient light in the mobile phone, or a circuit module capable of generating a dimming signal and a periodic signal according to a user dimming control command, and the like, without limitation.
In this embodiment, the dimming signal may be a PWM signal; the periodic signal is a signal including a period of the dimming signal, that is, the period in which the dimming signal is recorded. The front-end module 101 may be connected to the processing module 10 through an EDP (Embedded display port) interface, and the front-end module 101 may transmit the modulated optical signal and the periodic signal after encoding, so as to ensure the accuracy of signal transmission and avoid loss or interference. The periodic signal and the dimming signal can be encoded by the currently common encoding method without limitation.
And the processing module 10 is configured to synchronously output the dimming signal and the periodic pulse signal to the driving module 20 according to the dimming signal and the periodic signal.
Before the front-end module 101 transmits the dimming signal and the periodic signal, the encoding process is performed, and when the processing module 10 receives the signal, the corresponding decoding process may be performed, so as to obtain the dimming signal and the periodic signal.
Specifically, the processing module 10 includes a data registering unit 11, a data converting unit 12 and a sending unit 13; the data registering unit 11 is configured to store a dimming signal; a data conversion unit 12 for converting the periodic signal into a periodic pulse signal; the transmitting unit 13 is configured to synchronously output the dimming signal and the periodic pulse signal to the driving module 20 according to the initial characteristic of the periodic pulse signal; the start feature characterizes the start of one period of the periodic pulse signal. The data register unit 11 can temporarily store the dimming signal, and can conveniently control when the dimming signal is transmitted to the driving module 20. The data conversion unit 12 may be a digital-to-analog conversion circuit or a digital-to-analog converter, and may convert the periodic signal into a periodic pulse signal. The transmitting unit 13 can transmit the dimming signal and the periodic pulse signal according to the initial characteristic of the periodic pulse signal, so as to ensure the synchronism of the two signals.
For example, the starting characteristic of the periodic pulse signal may be the first rising edge or the first falling edge. The transmitting unit 13 is configured to output the dimming signal and the periodic pulse signal to the driving module 20 synchronously according to a first rising edge or a first falling edge of the periodic pulse signal. In this embodiment, the initial characteristic is the first rising edge, so as to avoid the dimming delay and ensure the high effectiveness. When the initial characteristic of the periodic pulse signal is detected, the trigger sending unit 13 sends the periodic pulse signal and the dimming signal in the data registering unit 11 to the driving module 20 synchronously, so as to ensure the accurate synchronization of the two signals and avoid the generation of delay, as shown in fig. 3. Therefore, when the dimming signal in the front-end module 101 changes, the periodic pulse signal also changes synchronously, and when the driving module 20 samples two signals, the sampling result can be more accurately matched, so that the problem that the frequency change cannot be identified in the prior art during sampling can be avoided.
And the driving module 20 is configured to sample the dimming signal according to the periodic pulse signal, and output a dimming current for dimming according to a sampling result. Specifically, the sampling result includes a first counting result and a second counting result; the driving module 20 includes a signal sampling unit 21, a period sampling unit 22, an arithmetic unit 23, and a conversion output unit 24.
The signal sampling unit 21 is configured to count the dimming signal to obtain a first count result of the current period; and the period sampling unit 22 is configured to count the periodic pulse signals to obtain a second count result of the current period. Both the signal sampling unit 21 and the period sampling unit 22 may be implemented using registers. Since the dimming signal and the periodic pulse signal are synchronous signals, sampling can be started synchronously when sampling is performed. Similarly, the signal sampling unit 21 may start to count the dimming signal according to the initial characteristic of the periodic pulse signal to obtain a first counting result of the current period; the period sampling unit 22 may start to count the periodic pulse signal according to the start characteristic of the periodic pulse signal, and obtain a second counting result of the current period. One counting period is corresponding between the two initial characteristics; and when sampling and counting, each counting period corresponds to one counting result. For example, the first rising edge of the periodic pulse signal may be used as a trigger condition for sampling to start synchronous sampling; taking the second rising edge of the periodic pulse signal as a sampling end triggering condition of the current period, wherein a counting period is formed between the two rising edges of the periodic pulse signal; the accuracy of the sampling result can be ensured by triggering synchronous sampling.
The specific sampling method can be as follows: a signal sampling unit 21, which is used for sampling and counting to 1 when the dimming signal is at high level and counting to 0 at low level in the current period; obtaining a first counting result of the current period according to the result that the counting in the dimming signal is 1; that is, the first count result is the sum of the results of counting 1 in the dimming signal, as shown in fig. 4. A period sampling unit 22, which is used for sampling and counting to 1 when the periodic pulse signal is at high level and counting to 0 at low level in the current period; according to the result that the count in the periodic pulse signal is 0, obtaining a second count result of the current period; that is, the second count result is the sum of the results of counting 0 in the periodic pulse signal, as shown in fig. 5. It should be noted that the counting result of the sampling may be stored in a preset register, and is called by the arithmetic unit 23 when the sampling calculation is completed.
Further, the operation unit 23 processes the first counting result of the current period and the second counting result of the current period to obtain the duty ratio of the current period; that is, the operation unit 23 may obtain the duty ratio according to the ratio of the first counting result to the second counting result, as shown in fig. 6.
In addition, in other embodiments, the duty ratio may be obtained by correcting or compensating for a ratio of the first counting result to the second counting result. For example, it is found through detection that directly using the ratio of the first counting result and the second counting result as the duty ratio results in a larger final dimming result; the ratio of the first counting result to the second counting result can be reduced and corrected to obtain the corrected duty ratio, so that a better dimming result is ensured.
And a conversion output unit 24 for outputting a dimming current for dimming in the present period according to the duty ratio of the present period. The specific way of converting the duty cycle into the dimming current can adopt the existing implementation way, and is not described in this embodiment again. Because the duty ratio is from the dimming signal and the periodic pulse signal, the periodic self-identification of the dimming signal is avoided; meanwhile, the dimming signal and the periodic pulse signal are synchronous signals, and no time delay is generated between the dimming signal and the periodic pulse signal. The dimming signal and the corresponding period can be accurately obtained according to the sampled result, and the stability and accuracy of the duty ratio are ensured, so that the final dimming current is stable and accurate, and the screen flashing phenomenon during dimming is avoided.
The following example is also used in the present embodiment:
the processing module 10 in this embodiment may be a TCON (Timer Control Register) chip, as shown in fig. 7; the driving module 20 in this embodiment may be a driving chip, as shown in fig. 8. The GPOA pin of the TCON chip receives the coded dimming signal and the periodic signal, i.e., the signal PWMI, input by the front-end module 101; the TCON chip converts the periodic signal into a periodic Pulse signal, i.e., a signal Pulse, after decoding, and the dimming signal is represented as a signal PWMO. After the periodic pulse signal triggers synchronous output in the TCON chip, the periodic pulse signal is output to an NC pin of the driving chip by a GPO3 pin of the TCON chip, and the dimming signal is output to a PWM pin of the driving chip by a GPO6 pin of the TCON chip. Finally, the driving chip samples and counts the dimming signal and the periodic pulse signal to obtain a duty ratio; and the duty ratio is converted into dimming currents, namely a current LED1, a current LED2, a current LED3 and a current LED4 which are respectively output by a pin CH1, a pin CH2, a pin CH3 and a pin CH4, so that screen dimming is realized.
In summary, the backlight driving system 100 provided in the present embodiment includes: a processing module 10 and a driving module 20; the processing module 10 is connected to the front end module 101, and the driving module 20 is connected to the processing module 10; the processing module 10 is configured to receive the dimming signal and the periodic signal output by the front-end module 101; and synchronously outputs a dimming signal and a periodic pulse signal to the driving module 20 according to the dimming signal and the periodic signal; and the driving module 20 is configured to sample the dimming signal according to the periodic pulse signal, and output a dimming current for dimming according to a sampling result. In the present embodiment, compared to the prior art, the processing module 10 is added, and the processing module 10 receives the dimming signal and the periodic signal, converts the dimming signal into the periodic pulse signal, and outputs the periodic pulse signal to the driving module 20 in synchronization with the dimming signal, so as to avoid that the driving module 20 cannot accurately identify the change of the dimming signal and the period of the current dimming signal when sampling the dimming signal. Therefore, the present embodiment ensures the sampling accuracy of the driving module 20, so as to stably adjust the light of the screen and avoid the screen flicker due to the light adjustment.
Referring to fig. 9, based on the same inventive concept, in another embodiment of the present invention, a backlight driving method is further provided, which can be applied to the backlight driving system in the foregoing embodiment, and the backlight driving method includes:
step S11: the front-end module outputs a dimming signal and a periodic signal to the processing module;
step S12: the processing module synchronously outputs a dimming signal and a periodic pulse signal to the driving module according to the dimming signal and the periodic signal;
step S13: the driving module samples the dimming signal according to the periodic pulse signal and outputs dimming current for dimming according to a sampling result.
In the backlight driving method provided in this embodiment, the detailed implementation and technical effects of each step are the same as those of the embodiment of the backlight driving system, and for brief description, corresponding contents in the embodiment of the method may be referred to where this embodiment is not mentioned.
Referring to fig. 10, based on the same inventive concept, in another embodiment of the present invention, a backlight driving method is further provided, which can be applied to the processing module in the foregoing embodiment, and the backlight driving method includes:
step S21: receiving a dimming signal and a periodic signal output by a front-end module;
step S22: and synchronously outputting a dimming signal and a periodic pulse signal to a driving module according to the dimming signal and the periodic signal, so that the driving module samples the dimming signal according to the periodic pulse signal and outputs dimming current for dimming according to a sampling result.
In the backlight driving method provided in this embodiment, the detailed implementation and technical effects of each step are the same as those of the embodiment of the backlight driving system, and for brief description, corresponding contents in the embodiment of the method may be referred to where this embodiment is not mentioned.
Referring to fig. 11, based on the same inventive concept, in another embodiment of the present invention, a backlight driving method is further provided, which can be applied to the driving module in the foregoing embodiment, and the backlight driving method includes:
step S31: the receiving processing module synchronously outputs a dimming signal and a periodic pulse signal according to the dimming signal and the periodic signal; wherein the dimming signal and the periodic signal are from a front-end module;
step S32: and sampling the dimming signal according to the periodic pulse signal, and outputting dimming current for dimming according to a sampling result.
In the backlight driving method provided in this embodiment, the detailed implementation and technical effects of each step are the same as those of the embodiment of the backlight driving system, and for brief description, corresponding contents in the embodiment of the method may be referred to where this embodiment is not mentioned.
The term "and/or" appearing herein is merely one type of associative relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship; the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (11)
1. A backlight driving system, comprising: the device comprises a processing module and a driving module; the driving module is connected with the processing module;
the processing module is used for receiving a dimming signal and a periodic signal; synchronously outputting a dimming signal and a periodic pulse signal to the driving module according to the dimming signal and the periodic signal;
the driving module is used for sampling the dimming signal according to the periodic pulse signal and outputting dimming current for dimming according to a sampling result.
2. The backlight driving system according to claim 1, wherein the processing module comprises a data register unit, a data conversion unit and a transmission unit;
the data registering unit is used for storing the dimming signal;
the data conversion unit is used for converting the periodic signal into a periodic pulse signal;
the sending unit is used for synchronously outputting the dimming signal and the periodic pulse signal to the driving module according to the initial characteristic of the periodic pulse signal; the start feature characterizes a start of a period of the periodic pulse signal.
3. The backlight driving system according to claim 2, wherein the start feature is a first rising edge of the periodic pulse signal;
the sending unit is further specifically configured to output the dimming signal and the periodic pulse signal to the driving module synchronously according to a first rising edge of the periodic pulse signal.
4. The backlight driving system according to claim 2, wherein the sampling result comprises a first counting result and a second counting result; the driving module comprises a signal sampling unit, a period sampling unit, an arithmetic unit and a conversion output unit;
the signal sampling unit is used for counting the dimming signals and obtaining a first counting result of the current period;
the periodic sampling unit is used for counting the periodic pulse signals to obtain a second counting result of the current period;
the arithmetic unit is used for processing the first counting result and the second counting result to obtain the duty ratio of the current period;
and the conversion output unit is used for outputting dimming current used for dimming in the current period according to the duty ratio.
5. The backlight driving system according to claim 4, wherein the signal sampling unit is specifically configured to count the dimming signal according to a start characteristic of a periodic pulse signal to obtain the first count result; the start feature characterizes the start of one period of the periodic pulse signal;
the periodic sampling unit is used for counting the periodic pulse signals according to the initial characteristics of the periodic pulse signals to obtain the second counting result.
6. The backlight driving system according to claim 5, wherein the signal sampling unit is specifically configured to count to 1 when the dimming signal is at a high level in a current period; obtaining the first counting result according to the result that the counting in the dimming signal is 1;
the periodic sampling unit is used for counting to be 0 when the periodic pulse signal is at a low level in the current period; and obtaining the second counting result according to the result that the counting in the periodic pulse signal is 0.
7. The backlight driving system according to claim 5 or 6, wherein the operation unit is specifically configured to obtain the duty ratio according to a ratio of the first counting result to the second counting result.
8. The backlight driving system according to claim 1, wherein the processing module is a TCON chip.
9. A backlight driving method applied to the backlight driving system according to any one of claims 1 to 8, the backlight driving method comprising:
the processing module receives a dimming signal and a periodic signal;
the processing module synchronously outputs a dimming signal and a periodic pulse signal to the driving module according to the dimming signal and the periodic signal;
the driving module samples the dimming signal according to the periodic pulse signal and outputs dimming current for dimming according to a sampling result.
10. A backlight driving method applied to the processing module of any one of claims 1 to 8, the backlight driving method comprising:
receiving a dimming signal and a periodic signal;
and synchronously outputting a dimming signal and a periodic pulse signal to a driving module according to the dimming signal and the periodic signal, so that the driving module samples the dimming signal according to the periodic pulse signal and outputs dimming current for dimming according to a sampling result.
11. A backlight driving method applied to the driving module of any one of claims 1 to 8, the backlight driving method comprising:
the receiving processing module synchronously outputs a dimming signal and a periodic pulse signal according to the dimming signal and the periodic signal;
and sampling the dimming signal according to the periodic pulse signal, and outputting dimming current for dimming according to a sampling result.
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