CN113838429B - Backlight driving method and system - Google Patents
Backlight driving method and system Download PDFInfo
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- CN113838429B CN113838429B CN202111123524.6A CN202111123524A CN113838429B CN 113838429 B CN113838429 B CN 113838429B CN 202111123524 A CN202111123524 A CN 202111123524A CN 113838429 B CN113838429 B CN 113838429B
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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 following steps: 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; according to the dimming signal and the periodic signal, synchronously outputting the dimming signal and the periodic pulse signal to the driving module; 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 the sampling result. The invention can avoid that the driving module can not accurately identify the change of the dimming signal and the period of the current dimming signal when the driving module samples the dimming signal, and ensure the sampling accuracy of the driving module, thereby stabilizing the dimming of the screen and avoiding dimming and screen flashing.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a backlight driving method and system.
Background
The existing LCD (Liquid Crystal Display ) products rely on LED (Light-Emitting Diode) backlight to emit Light, and the dimming modes thereof are mainly divided into DC dimming and PWM (Pulse width modulation) dimming. DC dimming is a technology for adjusting brightness by directly controlling the magnitude of current at both sides of a light emitting assembly, and when the current at both sides of an LED backlight becomes smaller, the brightness becomes lower accordingly; PWM dimming is a technology for controlling brightness by rapidly switching on and off a screen light source, the faster the switching speed is, the faster the screen flicker is, when the frequency of the switching light source exceeds the limit of human eyes, the brightness information of all pictures is overlapped in human eyes, and at the moment, the speed of the frequency only affects the brightness of the screen. Because PWM adjusts luminance through quick scintillation, even though the human eye can't perceive the picture change of switching process, but can react to this kind of phenomenon from physiology, frequent scintillation is more easy to cause tired to the muscle on both sides of eyes to stimulate diopter system and link, accelerate the ageing of eyesight. Thus, currently backlight driving DC dimming gradually replaces PWM dimming.
However, in the prior art, when DC dimming is performed, when the dimming frequency is converted from high frequency to low frequency, high level and period cannot be accurately sampled, and backlight current may suddenly change to cause flicker.
Disclosure of Invention
In view of the above problems, the invention provides a backlight driving method and a system, which can avoid that a driving module can not accurately identify the change of a dimming signal and the period of a current dimming signal when the driving module samples the dimming signal, ensure the sampling accuracy of the driving module, and therefore, stably dimming a screen and avoiding dimming and screen flashing.
In a first aspect, the present application provides, by way of an embodiment, the following technical solutions:
a backlight driving system, comprising: 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; according to the dimming signal and the periodic signal, synchronously outputting the dimming signal and the periodic pulse signal to the driving module; 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.
Optionally, the processing module includes a data registering unit, a data converting unit and a transmitting 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 the start of one period of the periodic pulse signal.
Optionally, 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.
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 operation 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 period sampling unit is used for counting the period pulse signals to obtain a second counting result of the current period; the operation 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 a dimming current 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 an initial characteristic of the periodic pulse signal, so as to obtain the first count result; the initial characteristic represents the initial 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 1 when the dimming signal is at a high level in a current period; obtaining the first counting result according to the result of the 1 counting in the dimming signal; the period sampling unit is used for counting to be 0 when the period pulse signal is at a low level in the current period; and obtaining the second counting result according to the result of counting 0 in the periodic pulse signal.
Optionally, the operation unit is specifically configured to obtain a duty ratio according to a ratio of the first count result to the second count result.
Optionally, the processing module is a TCON chip.
In a second aspect, based on the same inventive concept, the present application provides, by way of an embodiment, the following technical solutions:
a backlight driving method applied to the backlight driving system of any one of the first aspect, the backlight driving method comprising:
the processing module receives the dimming signal and the 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, by way of an embodiment, the following technical solutions:
a backlight driving method applied to the processing module of any one 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 a dimming current for dimming according to a sampling result.
According to a fourth aspect, based on the same inventive concept, the present application provides, by way of an embodiment, the following technical solutions:
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, wherein the system comprises the following steps: 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; according to the dimming signal and the periodic signal, synchronously outputting the dimming signal and the periodic pulse signal to the driving module; 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 the sampling result. Compared with the prior art, the embodiment of the invention has the advantages that the processing module is added, 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, so that the situation 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 is avoided. Therefore, the embodiment ensures the sampling accuracy of the driving module, thereby stabilizing the dimming of the screen and avoiding the dimming and screen flashing.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. In the drawings:
FIG. 1 is a schematic diagram of a screen shot analysis of prior art dimming in an embodiment of the present invention;
FIG. 2 shows a schematic diagram of a backlight driving system in an embodiment of the invention;
fig. 3 is a schematic diagram showing that a dimming signal and a periodic pulse signal are matched in synchronization with each other in the embodiment of the present invention;
FIG. 4 is a schematic diagram of sampling an optical signal according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of sampling a periodic pulse signal in an embodiment of the present invention;
FIG. 6 is a schematic diagram showing a high duty ratio of a dimming signal according to an embodiment of the present invention;
fig. 7 shows a schematic structural diagram of a TCON chip in an embodiment of the present invention;
FIG. 8 is a schematic diagram showing the structure of a driving 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 invention;
FIG. 10 is a flow chart of another method of driving a backlight in an embodiment of the invention;
fig. 11 shows a flowchart of still another backlight driving method in an 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 and development personnel analyze the current DC dimming and find that a front-end module in the prior art is directly connected with an LED driver; the LED drive directly calculates and cycle identifies the PWM signal. When the frequency of the PWM signal output by the front-end architecture becomes low, the high-level duration becomes long in the process of converting the high frequency into the low frequency because the counting register driven by the LED cannot recognize the frequency change. At this time, the counting register samples according to the previous period, and the previous period is smaller than the current period, so that the currently collected data are all high level, the LED driving error considers that the duty ratio is increased to 100%, and the backlight current is suddenly changed to the maximum value. When the low level arrives, all the data collected currently are low level, and the backlight current is suddenly changed to be the lowest, namely, flicker occurs. 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 to output, the low current is continuously close to two periods, resulting in the output dimming current being delayed by two periods from the PWM signal. In view of this situation, there is provided a backlight driving system in the present embodiment that improves the above-described problems, and the inventive concept is explained and illustrated in detail below by way of specific embodiments.
Referring to fig. 2, in one embodiment of the present invention, a backlight driving system 100 is provided, and 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 drive module 20 is connected to the processing module 10.
The front end module 101 is configured to output a dimming signal and a 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 may be a circuit module capable of generating a dimming signal and a periodic signal according to a user dimming control instruction, and the like, which is not limited.
In this embodiment, the dimming signal may be a PWM signal; the period signal is a signal including a period of the dimming signal, that is, a period in which the dimming signal is recorded. The front-end module 101 can be connected with the processing module 10 through an EDP (Embedded DisplayPort, embedded display interface) interface, and the modulated light signals and the periodic signals can be transmitted after being encoded in the front-end module 101, so that the accuracy of signal transmission is ensured, and loss or interference is avoided. The periodic signal and the dimming signal can be encoded by the currently common encoding method without limitation.
The processing module 10 is configured to output the dimming signal and the periodic pulse signal to the driving module 20 synchronously according to the dimming signal and the periodic signal.
Before the front-end module 101 transmits the dimming signal and the periodic signal, the front-end module performs encoding processing, and when the processing module 10 receives the signal, the processing module may perform corresponding decoding processing, thereby obtaining 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 transmitting unit 13; wherein, the data register unit 11 is used for storing the dimming signal; a data conversion unit 12 for converting the periodic signal into a periodic pulse signal; a transmitting unit 13, configured to synchronously output the dimming signal and the periodic pulse signal to the driving module 20 according to the start characteristic of the periodic pulse signal; the start feature characterizes the start of one cycle of the periodic pulse signal. The data register unit 11 can temporarily store the dimming signal, so that the dimming signal can be conveniently controlled when the dimming signal is sent 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 a periodic signal into a periodic pulse signal. The transmitting unit 13 may transmit the dimming signal and the periodic pulse signal according to the start characteristic of the periodic pulse signal, so as to ensure the synchronism of the two signal transmissions.
For example, the start of the periodic pulse signal may be characterized by a first rising edge or a 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 may be the first rising edge, so as to avoid dimming delay and ensure higher effectiveness. When the initial characteristic of the periodic pulse signal is detected, the trigger transmitting unit 13 transmits the periodic pulse signal and the dimming signal in the data registering unit 11 to the driving module 20 synchronously, so that the accurate synchronization of the two signals is ensured, and the generation of time delay is avoided, as shown in fig. 3. Thus, when the dimming signal in the front-end module 101 changes, the periodic pulse signal will also change synchronously, and when the driving module 20 samples the two signals, the sampling result can be matched more accurately, so that the problem that the frequency change cannot be identified when the sampling is performed in the prior art can be avoided.
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 the sampling result. Specifically, the sampling result comprises 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 operation unit 23, and a conversion output unit 24.
A signal sampling unit 21, configured to count the dimming signal, and obtain a first count result of the current period; the period sampling unit 22 is configured to count the period pulse signal, and 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 synchronously started when sampling is performed. Similarly, the signal sampling unit 21 may start counting 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 counting the periodic pulse signal according to the start characteristic of the periodic pulse signal, to obtain a second count result of the current period. A counting period corresponds to the two initial characteristics; 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 turn on 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 arranged 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 mode can be as follows: a signal sampling unit 21 that samples and counts 1 when the dimming signal is at a high level and counts 0 when the dimming signal is at a low level in the current period; according to the result of counting 1 in the dimming signal, a first counting result of the current period is obtained; that is, the first count result is the sum of the results of the count of 1 in the dimming signal, as shown in fig. 4. A period sampling unit 22 that samples and counts 1 when the period pulse signal is at a high level and counts 0 when the period pulse signal is at a low level in the current period; obtaining a second counting result of the current period according to the result of counting 0 in the periodic pulse signal; 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 count result of the sampling may be stored in a preset register, and the operation unit 23 may be used to retrieve the count result when the sampling is completed and the calculation is required.
Further, the operation unit 23 processes the first count result of the current period and the second count 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 count result to the second count result, as shown in fig. 6.
In addition, in other embodiments, the duty cycle may be obtained after correction or compensation for the ratio of the first count result to the second count result. For example, it is found by detection that directly taking the ratio of the first count result to the second count result as the duty ratio leads to 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 switching output unit 24 for outputting a dimming current for dimming the present period according to the duty ratio of the present period. The specific way of converting the duty ratio into the dimming current can be an existing implementation way, and will not be described in detail in this embodiment. The duty ratio is from the dimming signal and the periodic pulse signal, so that 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. According to the sampled result, the dimming signal and the corresponding period thereof can be accurately obtained, and the stability and accuracy of the duty ratio are ensured, so that the final dimming current is stable and accurate, and the phenomenon of screen flashing during dimming is avoided.
The present embodiment is also explained by way of the following example:
the processing module 10 in the present embodiment may be a TCON (Timer Control Register, timing controller) chip, as shown in fig. 7; the driving module 20 in the present 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; after the TCON chip decodes, the periodic signal is converted into a periodic Pulse signal, i.e., a signal Pulse, and the dimming signal is represented as a signal PWMO. After the periodic pulse signals trigger synchronous output in the TCON chip, the periodic pulse signals are output to the NC pin of the driving chip by the GPO3 pin of the TCON chip, and the dimming signals are output to the PWM pin of the driving chip by the 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 current, namely current LED1, current LED2, current LED3 and current LED4 respectively output by a CH1 pin, a CH2 pin, a CH3 pin and a CH4 pin, 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; wherein, the processing module 10 is configured to receive the dimming signal and the periodic signal output by the front-end module 101; and synchronously outputting the dimming signal and the periodic pulse signal to the driving module 20 according to the dimming signal and the periodic signal; 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 the sampling result. In this embodiment, compared with 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 and the dimming signal to the driving module 20 synchronously, so that the driving module 20 can not 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 dim the screen and avoid dimming and screen flashing.
Referring to fig. 9, based on the same inventive concept, there is also provided a backlight driving method in still another embodiment of the present invention, which is applicable to the backlight driving system in the foregoing embodiment, the backlight driving method including:
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.
The specific implementation and the technical effects of each step in the backlight driving method provided in this embodiment are the same as those in the foregoing embodiment of the backlight driving system, and for brevity, reference may be made to the corresponding content in the foregoing method embodiment for the part of this embodiment that is not mentioned.
Referring to fig. 10, based on the same inventive concept, there is also provided a backlight driving method, which is applicable to the processing module in the foregoing embodiment, in yet another embodiment of the present invention, the backlight driving method including:
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 a dimming current for dimming according to a sampling result.
The specific implementation and the technical effects of each step in the backlight driving method provided in this embodiment are the same as those in the foregoing embodiment of the backlight driving system, and for brevity, reference may be made to the corresponding content in the foregoing method embodiment for the part of this embodiment that is not mentioned.
Referring to fig. 11, based on the same inventive concept, there is also provided a backlight driving method in a further embodiment of the present invention, which is applicable to the driving module in the foregoing embodiment, the backlight driving method including:
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.
The specific implementation and the technical effects of each step in the backlight driving method provided in this embodiment are the same as those in the foregoing embodiment of the backlight driving system, and for brevity, reference may be made to the corresponding content in the foregoing method embodiment for the part of this embodiment that is not mentioned.
The term "and/or" as used herein is merely one association relationship describing the associated object, meaning that there may be three relationships, e.g., a and/or B, which may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are 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 use of the words first, second, third, etc. do not denote any order. These words may be interpreted as names.
It will be appreciated by those skilled in the art that 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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. It is therefore intended that the following claims be interpreted as including the 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 modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. A backlight driving system, comprising: 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; according to the dimming signal and the periodic signal, synchronously outputting the dimming signal and the periodic pulse signal to the driving module;
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 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 operation 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 period sampling unit is used for counting the period pulse signals to obtain a second counting result of the current period;
the operation 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 a dimming current for dimming in the current period according to the duty ratio.
2. The backlight driving system according to claim 1, wherein the processing module comprises a data registering unit, a data converting unit, and a transmitting 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 the start of one period of the periodic pulse signal.
3. A 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 1, wherein the signal sampling unit is specifically configured to count the dimming signal according to a start characteristic of a periodic pulse signal, and obtain the first count result; the initial characteristic represents the initial 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.
5. A backlight driving system according to claim 4, wherein the signal sampling unit is specifically configured to count 1 when the dimming signal is at a high level in the current period; obtaining the first counting result according to the result of the 1 counting in the dimming signal;
the period sampling unit is used for counting to be 0 when the period pulse signal is at a low level in the current period; and obtaining the second counting result according to the result of counting 0 in the periodic pulse signal.
6. A backlight driving system according to claim 4 or 5, wherein the operation unit is specifically configured to obtain a duty cycle according to a ratio of the first count result to the second count result.
7. The backlight driving system according to claim 1, wherein the processing module is a TCON chip.
8. A backlight driving method, characterized by being applied to the backlight driving system according to any one of claims 1 to 7, comprising:
the processing module receives the dimming signal and the 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.
9. A backlight driving method, applied to the processing module of any one of claims 1 to 7, 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 a dimming current for dimming according to a sampling result.
10. A backlight driving method, applied to the driving module of any one of claims 1 to 7, 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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