CN106898312A - A kind of control method of liquid crystal display, system and intelligent synchronization module - Google Patents
A kind of control method of liquid crystal display, system and intelligent synchronization module Download PDFInfo
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- CN106898312A CN106898312A CN201510964339.8A CN201510964339A CN106898312A CN 106898312 A CN106898312 A CN 106898312A CN 201510964339 A CN201510964339 A CN 201510964339A CN 106898312 A CN106898312 A CN 106898312A
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- frequency
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- crystal display
- frame synchronization
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The present invention relates to technical field of image processing, a kind of control method of liquid crystal display, system and intelligent synchronization module are disclosed.The control method of the liquid crystal display that the present invention is provided, including：Obtain the refreshing frequency of present frame synchronizing frequency and frame buffer；According to the present frame synchronizing frequency and the refreshing frequency of frame buffer, judge whether the frame synchronization frequency of liquid crystal display needs to update；If necessary to update, then frame synchronization frequency is updated；If need not update, keep the present frame synchronizing frequency constant.Using technical solution of the present invention, LCD controller can be according to the refreshing frequency of liquid crystal display, and dynamic adjustment frame synchronization frequency, so as to effectively use frame memory memory bandwidth, reduces the power consumption of overall liquid crystal display systems.
Description
Technical field
The present invention relates to technical field of image processing, more particularly to a kind of control method of liquid crystal display,
System and a kind of intelligent synchronization module.
Background technology
In the prior art, the control system of liquid crystal display is as shown in figure 1, the system is generally included：Liquid
Crystal display (Liquid Crystal Display, abbreviation LCD), the controller of liquid crystal display, center
Processor (Central Processing Unit, abbreviation CPU) and memory；Wherein, it is described current
The controller of LCD is according to frame synchronization (the vertical synchronization signal, abbreviation for specifying
VSYNC) frequency sends view data to LCD.When LCD generally requires three in prior art
Sequential signal：Frame synchronizing signal VSYNC, line synchronising signal (Chorizontal synchronization signal,
Abbreviation HSYNC) and pixel clock signal VCLK.
Wherein, VSYNC is frame synchronizing signal, and VSYNC often sends 1 pulse, can mean that new
1 screen video data starts to send.And HSYNC is line synchronising signal, each HSYNC pulse shows
1 new row video data starts to send.VCLK is the pixel clock for latching video data.
However, during the control that inventor realizes liquid crystal display, inventor has found prior art
In at least there are the following problems：
Most software cannot get the LCD refreshing frequencys of itself needs in prior art, lead to
The highest frequency for often using lcd controller to support, therefore, the in most cases work(of LCD
Consumption is larger.
The content of the invention
It is an object of the invention to provide a kind of control method of liquid crystal display, system and intelligent synchronization mould
Block so that the lower power consumption of liquid crystal display.
In order to solve the above technical problems, embodiments of the present invention provide a kind of control of liquid crystal display
Method, the method includes：
Obtain the refreshing frequency of present frame synchronizing frequency and frame buffer；
According to the present frame synchronizing frequency and the refreshing frequency of frame buffer, the frame of liquid crystal display is judged
Whether synchronizing frequency needs to update；
If necessary to update, then frame synchronization frequency is updated；
If need not update, keep the present frame synchronizing frequency constant.
Embodiments of the present invention additionally provide a kind of intelligent synchronization module, including：
Information acquisition unit, the refreshing frequency for obtaining present frame synchronizing frequency and frame buffer；
Judging unit, for the refreshing frequency according to the present frame synchronizing frequency and frame buffer, judges
Whether the frame synchronization frequency of liquid crystal display needs to update；
Updating block, for if necessary to update, then updating frame synchronization frequency；
Holding unit, if for that need not update, keeping the present frame synchronizing frequency constant.
Embodiments of the present invention additionally provide a kind of control system of liquid crystal display, including：Memory,
The controller of central processing unit and liquid crystal display and liquid crystal display；Wherein, the liquid crystal display
Controller includes intelligent synchronization module as described above.
Embodiment of the present invention in terms of existing technologies, by automatic acquisition worked as by technical solution of the present invention
The refreshing frequency of previous frame synchronizing frequency and frame buffer, judges whether current frame synchronization frequency meets frame and delay
The refreshing requirement in area is deposited, dynamic adjustment frame synchronization frequency effectively uses frame memory memory bandwidth, from
And reduce the power consumption of overall liquid crystal display systems.
In addition, the method also includes：
Obtain the highest frame synchronization frequency and lowest frame synchronizing frequency of liquid crystal display；
Frame synchronization frequency after the renewal is not higher than the highest frame synchronization frequency, is not less than described minimum
Frame synchronization frequency.
In terms of existing technologies, technical solution of the present invention is by obtaining liquid crystal for embodiment of the present invention
Showing the highest frame synchronization frequency and lowest frame synchronizing frequency of device can normally be shown with effective guarantee liquid crystal display
Show, frame synchronization frequency will not be reduced to by the minimum of liquid crystal display according to the refreshing requirement of frame buffer
Below frame synchronization frequency or more than highest frame synchronization frequency, so as to influence the normal display of liquid crystal display.
In addition, the method also includes：
The renewal threshold value of default frame synchronization frequency；
When the frame synchronization frequency of the liquid crystal display is judged as needing to update, then according to the renewal threshold
Value, is adjusted to present frame synchronizing frequency.
Embodiment of the present invention in terms of existing technologies, passes through default using technical solution of the present invention
The renewal threshold value of frame synchronization frequency, and the refreshing requirement of the frame buffer more efficient carries out frame synchronization
Frequency is adjusted, so as to reduce the power consumption of overall liquid crystal display systems.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the control system of liquid crystal display in the prior art；
Fig. 2 is a kind of control method flow chart of liquid crystal display that first embodiment of the invention is provided；
Fig. 3 is a kind of structural representation of intelligent synchronization module that second embodiment of the invention is provided；
Fig. 4 is a kind of structural representation of the control system of liquid crystal display that third embodiment of the invention is provided
Figure；
Fig. 5 is that a kind of control system of liquid crystal display that fourth embodiment of the invention is provided uses 3 frames
Buffer area realizes the state diagram of frame synchronization frequency adjustment；
Fig. 6 is that a kind of control system of liquid crystal display that fifth embodiment of the invention is provided uses 2 frames
Buffer area realizes the state diagram of frame synchronization frequency adjustment.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to this hair
Bright each implementation method is explained in detail.However, it will be understood by those skilled in the art that
In each implementation method of the invention, in order that reader more fully understands the application and to propose many technologies thin
Section.But, even if many variations and modification without these ins and outs and based on following implementation method,
The application each claim technical scheme required for protection can also be realized.
First embodiment of the invention is related to a kind of control method of liquid crystal display.Idiographic flow is as schemed
Shown in 2.The method includes：
Step 201：The renewal threshold value of default frame synchronization frequency；The shown threshold value that updates is frame synchronization frequency
Adjustment amplitude, meets update condition, then present frame synchronizing frequency can be carried out according to the renewal threshold value
Adjustment is once.
Step 202：Obtain the refreshing frequency and liquid crystal display of present frame synchronizing frequency and frame buffer
Highest frame synchronization frequency and lowest frame synchronizing frequency；Frame synchronization frequency after the renewal is not higher than described
Highest frame synchronization frequency, is not less than the lowest frame synchronizing frequency.
Step 203：According to the present frame synchronizing frequency and the refreshing frequency of frame buffer, liquid crystal is judged
Whether the frame synchronization frequency of display needs to update；Concretely, exactly judge present frame synchronizing frequency with
Whether the refreshing frequency of its frame buffer matches；If the refreshing frequency of the frame buffer reaches reduction
Or the condition of raising present frame synchronizing frequency, then it is judged as needing to update；If the frame buffer
Refreshing frequency is not up to the reduction or improves the condition of present frame synchronizing frequency, then being judged as need not
Update.
Step 204：If necessary to update, then frame synchronization frequency is updated；The step is specifically included：Work as institute
The refreshing frequency according to the present frame synchronizing frequency and frame buffer is stated, judges that the frame of liquid crystal display is same
When synchronizing frequency needs to reduce, according to the renewal threshold value, the present frame synchronizing frequency is reduced.Or,
When described according to the present frame synchronizing frequency and the refreshing frequency of frame buffer, liquid crystal display is judged
When frame synchronization frequency needs to improve, according to the renewal threshold value, the present frame synchronizing frequency is improved.
Step 205：If need not update, keep the present frame synchronizing frequency constant.
Embodiment of the present invention in terms of existing technologies, by automatic acquisition worked as by technical solution of the present invention
The refreshing frequency of previous frame synchronizing frequency and frame buffer, judges whether current frame synchronization frequency meets frame and delay
The refreshing requirement in area is deposited, dynamic adjustment frame synchronization frequency effectively uses frame memory memory bandwidth, from
And reduce the power consumption of overall liquid crystal display systems.And technical solution of the present invention can also be by obtaining liquid crystal
Show that the highest frame synchronization frequency and lowest frame synchronizing frequency of device are normally shown with effective guarantee liquid crystal display
Show, frame synchronization frequency will not be reduced to by the minimum of liquid crystal display according to the refreshing requirement of frame buffer
Below frame synchronization frequency or more than highest frame synchronization frequency, so as to influence the normal display of liquid crystal display.
And technical solution of the present invention can also be by the renewal threshold value of default frame synchronization frequency, and the frame buffer
The refreshing requirement in area is more efficient to carry out frame synchronization frequency adjustment, so as to reduce overall liquid crystal display systems
Power consumption.
Based on above example, the present invention also provides a kind of intelligent synchronization module, as shown in figure 3, the intelligence
Energy synchronization module includes：
Information acquisition unit 301, the refreshing frequency for obtaining present frame synchronizing frequency and frame buffer；
Judging unit 302, for the refreshing frequency according to the present frame synchronizing frequency and frame buffer,
Judge whether the frame synchronization frequency of liquid crystal display needs to update；
Updating block 303, for if necessary to update, then updating frame synchronization frequency；
Holding unit 304, if for that need not update, keeping the present frame synchronizing frequency constant.
It should be noted that the module also includes：Parameter acquiring unit, for obtaining liquid crystal display
Highest frame synchronization frequency and lowest frame synchronizing frequency；Frame synchronization frequency after the renewal be not higher than it is described most
Frame synchronization frequency high, is not less than the lowest frame synchronizing frequency.
Also, it should be noted that the module also includes：
Threshold setting unit, the renewal threshold value for presetting frame synchronization frequency；When the liquid crystal display
When frame synchronization frequency is judged as needing to update, then according to the renewal threshold value, present frame synchronizing frequency is entered
Row adjustment.
Based on above example, the present invention also provides a kind of control system of liquid crystal display, such as Fig. 4 institutes
Show, the system includes：Memory DDR, central processor CPU, LCD controller and LCD；
Wherein, the LCD controller includes the as above item intelligent synchronization module.
Wherein, the intelligent synchronization module by from register management unit obtain highest frame synchronization frequency and
Lowest frame synchronizing frequency, the refreshing frequency and present frame for obtaining frame buffer from central processor CPU is same
Synchronizing frequency.
Based on above example, as shown in figure 5, with Android android4.4 systems, employing 3 frames
As a example by buffer area framebuffer, Mobile state can be entered to frame synchronization frequency using following scheme and adjusted；
If the condition that the frame synchronization frequency needs for judging liquid crystal display are reduced is：Connect at least two
Continuous frame synchronization periods are that in VSYNC events, the refreshing frequency of frame buffer is framebuffer update
It is 0 to operate, i.e., predetermined threshold value is 0；The frame synchronization frequency for judging liquid crystal display needs the bar for improving
Part is：In same frame synchronization periods, the refreshing frequency of frame buffer is at least 2 times；
First, the refreshing frequency and liquid crystal display of present frame synchronizing frequency and frame buffer are obtained most
Frame synchronization frequency high and lowest frame synchronizing frequency；Frame synchronization frequency after the renewal is not higher than the highest
Frame synchronization frequency, is not less than the lowest frame synchronizing frequency.
Secondly, judge in a frame synchronization periods there is the refreshing frequency of the frame buffer of more than 2 times
When, then present frame synchronizing frequency is lifted according to the renewal threshold value；Frame synchronization frequency after the lifting
Not higher than described highest frame synchronization frequency.
Or, at least two continuous frame synchronization periods, the refreshing frequency of frame buffer is 0, then
According to the renewal threshold value reduction present frame synchronizing frequency；Frame synchronization frequency after the reduction, is not less than
The lowest frame synchronizing frequency.
It should be noted that if the feelings that present frame synchronizing frequency is lifted according to the renewal threshold value
Condition, it is possible to which the present frame synchronizing frequency is once transferred to the highest frame that position is adjusted to liquid crystal display
Synchronizing frequency.If liquid crystal display does not have the limitation of highest frame synchronization frequency, can be same by present frame
Synchronizing frequency is once transferred to 60Hz.
If the situation that present frame synchronizing frequency is reduced according to the renewal threshold value；For example：If current
Frame synchronization frequency is 60Hz, if renewal threshold value is 15Hz, is then worked as according to the renewal threshold value reduction is described
Previous frame synchronizing frequency is 45Hz；If the frame synchronization frequency of the liquid crystal display is further continued for being judged as needing
Then it is 30 according to the renewal threshold value reduction present frame synchronizing frequency, until being reduced to when reducing
The lowest frame synchronizing frequency of the liquid crystal display.Based on above example, as shown in fig. 6, work as using
During 2 frame buffer framebuffer, Mobile state can be entered to frame synchronization frequency using following scheme and adjusted；
It is described judge liquid crystal display frame synchronization frequency need reduce condition be：It is continuous at least two
Frame synchronization periods be that in VSYNC events, the refreshing frequency of frame buffer is framebuffer update
It is 0 to operate, i.e., predetermined threshold value is 0；The frame synchronization frequency for judging liquid crystal display needs the bar for improving
Part is：The refresh cycle of current frame buffer and the difference of current frame synchronization periods are less than the current frame synchronization
The 1/2 of cycle；
First, the refreshing frequency and liquid crystal display of present frame synchronizing frequency and frame buffer are obtained most
Frame synchronization frequency high and lowest frame synchronizing frequency；Frame synchronization frequency after the renewal is not higher than the highest
Frame synchronization frequency, is not less than the lowest frame synchronizing frequency.
Secondly, judge that the refresh cycle of current frame buffer and the difference of current frame synchronization periods are worked as less than described
Preceding frame synchronization periods 1/2 when, then by present frame synchronizing frequency according to it is described renewal threshold value lifted；It is described
Frame synchronization frequency after lifting is not higher than the highest frame synchronization frequency.
Or, at least two continuous frame synchronization periods, the refreshing frequency of frame buffer is 0, then
According to the renewal threshold value reduction present frame synchronizing frequency；Frame synchronization frequency after the reduction, is not less than
The lowest frame synchronizing frequency.
Based on above example, such as liquid crystal display LCD size is 720P, acceptable minimum refreshing
Frequency is 15fps, the Double Data Rate synchronous DRAM (Double that LCD refreshes under normal circumstances
Data Rate, abbreviation DDR) bandwidth occupancy be 1280*720*3*60=166MBps, if using this
The dynamic adjustment frame synchronization frequency technique of inventive technique scheme, then can be down to 41.5MBps.This means end
End can save 120MBps in the refreshing DDR bandwidth for browsing static Web page (under non-slip state),
Other LCD work expenses in itself can also be reduced, and 5 cun of smart mobile phones of 720p screens are saved under scene
The power consumption of province is more than 40ma.
It is noted that each module involved in present embodiment is logic module, in reality
In, a logic unit can be a physical location, or one the one of physical location
Point, can also be realized with the combination of multiple physical locations.Additionally, in order to protrude innovative part of the invention,
Not by the unit less close with technical problem relation proposed by the invention is solved in present embodiment
Introduce, but this is not intended that in present embodiment do not exist other units.
It will be understood by those skilled in the art that the respective embodiments described above be realize it is of the invention specific
Embodiment, and in actual applications, can to it, various changes can be made in the form and details, without inclined
From the spirit and scope of the present invention.
Claims (10)
1. a kind of control method of liquid crystal display, it is characterised in that including：
Obtain the refreshing frequency of present frame synchronizing frequency and frame buffer；
According to the present frame synchronizing frequency and the refreshing frequency of frame buffer, the frame of liquid crystal display is judged
Whether synchronizing frequency needs to update；
If necessary to update, then frame synchronization frequency is updated；
If need not update, keep the present frame synchronizing frequency constant.
2. the control method of liquid crystal display according to claim 1, it is characterised in that the party
Method also includes：
Obtain the highest frame synchronization frequency and lowest frame synchronizing frequency of liquid crystal display；
Frame synchronization frequency after the renewal is not higher than the highest frame synchronization frequency, is not less than described minimum
Frame synchronization frequency.
3. the control method of liquid crystal display according to claim 2, it is characterised in that the party
Method also includes：
The renewal threshold value of default frame synchronization frequency；
When the frame synchronization frequency of the liquid crystal display is judged as needing to update, then according to the renewal threshold
Value, is adjusted to present frame synchronizing frequency.
4. the control method of liquid crystal display according to claim 3, it is characterised in that work as institute
It is described according to the renewal threshold value when frame synchronization frequency for stating liquid crystal display is judged as needing to reduce, it is right
Present frame synchronizing frequency is adjusted step, specifically includes：
According to the renewal threshold value, the present frame synchronizing frequency is reduced.
5. the control method of the liquid crystal display according to claim 3 or 4, it is characterised in that
It is described according to the renewal when the frame synchronization frequency of the liquid crystal display is judged as needing to improve
Threshold value, step is adjusted to present frame synchronizing frequency, is specifically included：
According to the renewal threshold value, the present frame synchronizing frequency is improved.
6. the control method of liquid crystal display according to claim 5, it is characterised in that described
Judge liquid crystal display frame synchronization frequency need reduce condition be：In at least two continuous frame synchronization
In cycle, the refreshing frequency of frame buffer is predetermined threshold value；The frame synchronization for judging liquid crystal display is frequently
Rate need improve condition be：In same frame synchronization periods, the refreshing frequency of frame buffer is at least 2
It is secondary；Or, the difference of the refresh cycle of current frame buffer and current frame synchronization periods is less than the present frame
The 1/2 of synchronizing cycle.
7. a kind of intelligent synchronization module, it is characterised in that including：
Information acquisition unit, the refreshing frequency for obtaining present frame synchronizing frequency and frame buffer；
Judging unit, for the refreshing frequency according to the present frame synchronizing frequency and frame buffer, judges
Whether the frame synchronization frequency of liquid crystal display needs to update；
Updating block, for if necessary to update, then updating frame synchronization frequency；
Holding unit, if for that need not update, keeping the present frame synchronizing frequency constant.
8. intelligent synchronization module according to claim 7, it is characterised in that the module also includes：
Parameter acquiring unit, highest frame synchronization frequency and lowest frame synchronizing band for obtaining liquid crystal display
Rate；
Frame synchronization frequency after the renewal is not higher than the highest frame synchronization frequency, is not less than described minimum
Frame synchronization frequency.
9. intelligent synchronization module according to claim 8, it is characterised in that the intelligent synchronization
Module also includes：
Threshold setting unit, the renewal threshold value for presetting frame synchronization frequency；
When the frame synchronization frequency of the liquid crystal display is judged as needing to update, then according to the renewal threshold
Value, is adjusted to present frame synchronizing frequency.
10. a kind of control system of liquid crystal display, including：Memory, central processing unit and liquid crystal
Show the controller of device and liquid crystal display；Characterized in that, the controller of the liquid crystal display is included such as
Intelligent synchronization module described in any one in claim 7 to 9.
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| CN201510964339.8A CN106898312A (en) | 2015-12-21 | 2015-12-21 | A kind of control method of liquid crystal display, system and intelligent synchronization module |
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| CN113889050A (en) * | 2021-10-12 | 2022-01-04 | 集创北方(珠海)科技有限公司 | Polarity conversion method of liquid crystal panel and liquid crystal display |
| WO2023097879A1 (en) * | 2021-12-04 | 2023-06-08 | 深圳市奥拓电子股份有限公司 | Adaptive adjustment method and apparatus for refresh rate, and led display device |
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