CN107799086A - The over-driving method and device of liquid crystal display panel - Google Patents
The over-driving method and device of liquid crystal display panel Download PDFInfo
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- CN107799086A CN107799086A CN201711176483.0A CN201711176483A CN107799086A CN 107799086 A CN107799086 A CN 107799086A CN 201711176483 A CN201711176483 A CN 201711176483A CN 107799086 A CN107799086 A CN 107799086A
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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
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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
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/36—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of a graphic pattern, e.g. using an all-points-addressable [APA] memory
- G09G5/39—Control of the bit-mapped memory
- G09G5/393—Arrangements for updating the contents of the bit-mapped memory
Abstract
The present invention provides a kind of over-driving method and device of liquid crystal display panel.This method comprises the following steps：Video source signal is received, and the refreshing frequency of the video source signal is determined according to the video source signal；The over-driving look-up table according to corresponding to obtaining the refreshing frequency, over-driving look-up table corresponding to different refreshing frequencys are different；Liquid crystal display panel work is driven according to the over-driving look-up table of the acquisition, can be according to the change of the refreshing frequency of liquid crystal display device, the over-driving look-up table of adjust automatically liquid crystal display panel, ensure that liquid crystal display device is respectively provided with high-quality display effect under different refreshing frequencys.
Description
Technical field
The present invention relates to the over-driving method and device of display technology field, more particularly to a kind of liquid crystal display panel.
Background technology
With the development of Display Technique, the plane such as liquid crystal display (Liquid Crystal Display, LCD) display dress
Put because having the advantages that high image quality, power saving, fuselage is thin and has a wide range of application, and be widely used in mobile phone, TV, individual number
The various consumption electronic products such as word assistant, digital camera, notebook computer, desktop computer, turn into the master in display device
Stream.
It is backlight liquid crystal display that liquid crystal display device on existing market is most of, it include liquid crystal display panel and
Backlight module (backlight module).The operation principle of liquid crystal display panel is put among the parallel glass substrate of two panels
Liquid crystal molecule is put, controls liquid crystal molecule to change direction by whether being powered, the light of backlight module is reflected into generation picture
Face.
During liquid crystal display panel driving, because the reaction speed of liquid crystal is limited, it is difficult to reached within the time of a frame
To expected deflection angle, display brightness can be caused not reach expection, dynamic menu shows to trail, to overcome drawbacks described above,
Prior art proposes a kind of overdrive technique (over driver, OD), so that liquid crystal reaches expected inclined in the short period of time
Turn target, the principle of OD technologies is：If n is positive integer, when being switched to n frames from n-1 frames, if desired it is changed into GTG from GTG Gn-1
Gn, if the only driving voltage to corresponding GTG Gn, actual to be reached in n-th frame because the reaction speed of liquid crystal upset is slow
The GTG Gn needed less than us, and OD technologies are used, provided in n-th frame corresponding bigger with the voltage difference of GTG Gn-1 voltage
GTG Gn ' driving voltage, so as to accelerate liquid crystal reversal rate, reach our actually required GTG Gn in n-th frame, solve
Smear problem.
Further, in order to realize OD technologies, prior art is typically that can set one in liquid crystal display-driving system
OD look-up tables (Look-Up-Table, LUT), as shown in figure 1, the abscissa of the LUT is the GTG of former frame (Previous),
Ordinate is the GTG of present frame (Current), and the data for searching to obtain by former frame GTG and present frame GTG were
The GTG of reality output during driving, such as shown in Fig. 1, former frame GTG is 32, and present frame GTG is 96, by tabling look-up, crosses and drives
Really the GTG of output is 152 when dynamic.But because video source is different with mode of operation, liquid crystal display panel may work in
Different refresh rates, such as 60Hz and 144Hz, when refreshing frequency changes, or overdriving with corresponding original refreshing frequency
Look-up table is run, it is impossible to makes the change of adaptability with the change of refreshing frequency, display effect is bad.
The content of the invention
, can be according to liquid crystal it is an object of the invention to provide a kind of over-driving method of liquid crystal display panel and device
The change of the refreshing frequency of showing device, the over-driving look-up table of adjust automatically liquid crystal display panel, ensure that liquid crystal display device exists
High-quality display effect is respectively provided with different refreshing frequencys.
To achieve the above object, the present invention provides a kind of over-driving method of liquid crystal display panel, comprises the following steps：
Step S1, video source signal is received, and the refreshing frequency of the video source signal is determined according to the video source signal
Rate；
Step S2, the over-driving look-up table according to corresponding to obtaining the refreshing frequency, corresponding cross of different refreshing frequencys are driven
Dynamic look-up table is different；
Step S3, liquid crystal display panel work is driven according to the over-driving look-up table of the acquisition.
Alternatively, the step S2 includes：
Found in mapping relations according to the refreshing frequency from default refreshing frequency with over-driving look-up table corresponding
Over-driving look-up table.
Alternatively, the step S2 includes：
Zoom factor corresponding with the refreshing frequency is found according to the refreshing frequency；
According to the zoom factor and default base table of overdriving, corresponding over-driving look-up table is obtained, it is described to overdrive
Base table is over-driving look-up table corresponding to default refreshing frequency.
The over-driving look-up table obtained in the step S2 is the over-driving look-up table after compression, and the step S3 includes：
The over-driving look-up table obtained in depressurization steps S2, the over-driving look-up table after being decompressed；
Utilize the over-driving look-up table driving liquid crystal display panel work after decompression.
Over-driving look-up table after the compression is the list lattice of 8 row 8 or the list lattice of 16 row 16, overdriving after the decompression
Look-up table is the list lattice of 256 row 256.
By carrying out linear interpolation, the lookup of overdriving after being decompressed to the over-driving look-up table obtained in step S2
Table.
According to the zoom factor and default base table of overdriving, the formula for obtaining corresponding over-driving look-up table is：M=
N*a；Wherein, M is the data in over-driving look-up table, and N is the data overdrived in base table, and a is zoom factor.
The present invention also provides a kind of over-driving device of liquid crystal display panel, including：Determining unit and the determining unit
Connected acquiring unit and the driver element being connected with the acquiring unit；
The determining unit, determine that the video source is believed for receiving video source signal, and according to the video source signal
Number refreshing frequency；
The acquiring unit, for over-driving look-up table, different refreshing frequencys according to corresponding to refreshing frequency acquisition
Corresponding over-driving look-up table is different；
The driver element, for driving liquid crystal display panel work according to the over-driving look-up table of the acquisition.
Alternatively, the over-driving device also includes the memory cell being connected with the acquiring unit；
The memory cell, for storing the mapping relations of refreshing frequency and over-driving look-up table and corresponding to multiple brushes respectively
Multiple over-driving look-up tables of new frequency；The acquiring unit is according to the refreshing frequency from default refreshing frequency with overdriving
Corresponding over-driving look-up table is found in the mapping relations of look-up table.
Alternatively, the over-driving device also includes the memory cell being connected with the acquiring unit；
The memory cell, overdrive base table for storing and correspond to multiple contractings of multiple different refreshing frequencys respectively
Coefficient is put, the base table of overdriving is extremely drive data corresponding to default refreshing frequency；
The acquiring unit finds zoom factor corresponding with the refreshing frequency according to the refreshing frequency, and according to institute
Zoom factor and default base table of overdriving are stated, obtains corresponding over-driving look-up table.
Beneficial effects of the present invention：The present invention provides a kind of over-driving method of liquid crystal display panel, comprises the following steps：
Video source signal is received, and the refreshing frequency of the video source signal is determined according to the video source signal；According to the refreshing
Over-driving look-up table corresponding to frequency acquisition, over-driving look-up table corresponding to different refreshing frequencys are different；According to the acquisition
Over-driving look-up table driving liquid crystal display panel work, can be automatic to adjust according to the change of the refreshing frequency of liquid crystal display device
The over-driving look-up table of whole liquid crystal display panel, ensure that liquid crystal display device is respectively provided with high-quality display under different refreshing frequencys
Effect.The present invention also provides a kind of over-driving device of liquid crystal display panel, can be according to the refreshing frequency of liquid crystal display device
Change, the over-driving look-up table of adjust automatically liquid crystal display panel, ensure liquid crystal display device under different refreshing frequencys
With high-quality display effect.
Brief description of the drawings
In order to be further understood that the feature of the present invention and technology contents, refer to below in connection with the detailed of the present invention
Illustrate and accompanying drawing, however accompanying drawing only provide with reference to and explanation use, be not used for being any limitation as the present invention.
In accompanying drawing,
Fig. 1 is the schematic diagram of existing over-driving look-up table；
Fig. 2 is the structure chart of the over-driving device of the liquid crystal display panel of the present invention；
Fig. 3 is the step of detecting the frequency of pixel clock signal in the over-driving method of the liquid crystal display panel of the present invention
Schematic diagram；
Fig. 4 is the flow chart of the over-driving method of the liquid crystal display panel of the present invention.
Embodiment
Further to illustrate the technological means and its effect of the invention taken, below in conjunction with being preferable to carry out for the present invention
Example and its accompanying drawing are described in detail.
Referring to Fig. 4, the present invention provides a kind of over-driving method of liquid crystal display panel, comprise the following steps：
Step S1, video source signal is received, and the refreshing frequency of the video source signal is determined according to the video source signal
Rate.
Wherein, in step sl, the refreshing frequency process of the video source signal is determined according to the video source signal
Specifically include：
Step S11, from the video source signal, decompression draws pixel clock signal, and detects the pixel clock signal
Frequency；
Step S12, it is calculated according to the frequency of the pixel clock signal and default refreshing frequency calculation formula
The refreshing frequency of presently described liquid crystal display panel；
Wherein, the default refreshing frequency calculation formula is：Refresh=PCLKRefresh/ (V_total*H_
total)；
Wherein, Refresh is the refreshing frequency of liquid crystal display panel, and PCLKRefresh is the frequency of pixel clock signal,
V_total is the total data of default horizontal direction scanning, and H_total is the row data of default vertical scan direction.
Specifically, the process for the frequency for detecting the pixel clock signal in the step S11 specifically includes：
Step S111, at least two phase shift and frequency identical sampled clock signals successively are produced；
Step S112, the high level of the pixel clock signal is gathered by the sampled clock signal, and counts collection
To the bar number of the sampled clock signal of the high level of the pixel clock signal；
Step S113, the bar number meter of the sampled clock signal of the high level of the pixel clock signal is collected according to
Calculate the high level duration of pixel clock signal；
Step S114, it is described according to the frequency of the high level duration calculation pixel clock signal of the pixel clock signal
The frequency of pixel clock signal is equal to 1/ (2T), and T is the high level duration of pixel clock signal；
Wherein, twice of the cycle of the sampled clock signal more than the cycle of the pixel clock signal；The pixel
The computational methods of the high level duration of clock signal are：The time of T=t1*n, t1 between two adjacent sampled clock signals
Interval, n is the bar number of the sampled clock signal for the high level for collecting the pixel clock signal.
For example, as shown in figure 3, produce five successively sampled clock signal CCLK1, CCLK2 of phase shift, CCLK3,
CCLK4 and CCLK5, the time interval between two adjacent sampled clock signals is t1, as can be seen from Figure 3, sampling clock
Signal CCLK1, CCLK2, CCLK3, CCLK4 have collected pixel clock signal PCLK high level, namely collect the picture
The bar number of the sampled clock signal of plain clock signal PCLK high level is four, the high level of the pixel clock signal PCLK
When a length of 4t1, and generally pixel clock signal PCLK dutycycle is 50% in liquid crystal display device, therefore
The frequency of the pixel clock signal PCLK is 1/ (8t1).
It is understood that in order to reduce the error of the pixel clock signal PCLK of detecting frequency, allow in hardware
Under the conditions of, it should try one's best between the sampled clock signal of more a plurality of number is provided and reduces the time between adjacent sampled clock signal
Every.
Optionally, in order to further lift the accuracy of the pixel clock signal PCLK of detecting frequency, the step
In S1, multiple repairing weld can also be carried out to the high level of the pixel clock signal by the sampled clock signal, and accordingly
Multiple frequencies of the pixel clock signal are obtained, then calculate the average value of multiple frequencies of the pixel clock signal, with institute
State frequency of the average value of multiple frequencies as the pixel clock signal for calculating refreshing frequency.
At the same time, in order to further lift precision, in the step S1, the multiple of the pixel clock signal are calculated
The maximum and minimum value in multiple frequencies of the pixel clock signal can also be removed before the average value of frequency.
Preferably, sampling is produced by the time schedule controller for driving the liquid crystal display panel to work in the step S111
Clock signal, more particularly produced by the phaselocked loop (Phase Locked Loop, PLL) in time schedule controller.
Step S2, the over-driving look-up table according to corresponding to obtaining the refreshing frequency, corresponding cross of different refreshing frequencys are driven
Dynamic look-up table is different.
Specifically, in some embodiments of the invention, the step S2 is specially：According to the refreshing frequency from default
Refreshing frequency with finding corresponding over-driving look-up table in the mapping relations of over-driving look-up table.
For example, the refreshing for 60HZ~65HZ, 65HZ~70HZ, 75HZ~80HZ, 50HZ~55HZ and 45HZ~50HZ
Frequency is correspondingly arranged the first over-driving look-up table, the second over-driving look-up table, the 3rd over-driving look-up table, the 4th overdrived respectively
Look-up table and the 5th over-driving look-up table；When the refreshing frequency of the video source signal detected is 60Hz, then according to upper
Stating mapping relationship searching can obtain：The refreshing frequency of the video source signal is that over-driving look-up table corresponding to 60Hz is the first drive excessively
Dynamic look-up table.
Specifically, in other embodiments of the present invention, the step S2 can also include：
Step S21, zoom factor corresponding with the refreshing frequency is found according to the refreshing frequency.
For example, the refreshing for 60HZ~65HZ, 65HZ~70HZ, 75HZ~80HZ, 50HZ~55HZ and 45HZ~50HZ
Base table zoom factor corresponding to frequency range be respectively the first zoom factor a1, the second zoom factor a2, the 3rd zoom factor a3,
4th zoom factor a4 and the 5th zoom factor a5, when the refreshing frequency of the video source signal detected is 60Hz
When, then it can be obtained according to above-mentioned mapping relationship searching：The refreshing frequency of the video source signal is that zoom factor is corresponding to 60Hz
First zoom factor a1.
Step S22, according to the zoom factor and default base table of overdriving, corresponding over-driving look-up table, institute are obtained
It is extremely drive data corresponding to default refreshing frequency to state base table of overdriving.
Specifically, the default scaling algorithm is：M=N*a；Wherein, M is the data in over-driving look-up table, and N was
The data in base table are driven, a is zoom factor.It should be noted that if data M is more than in the over-driving look-up table after scaling
255, then data M just takes 255, namely M and N are that span is [0,255]；For example, when the refreshing frequency is
During 60Hz, then each data in the base table of overdriving are multiplied by the first zoom factor a1, you can it is corresponding to obtain 60Hz
Over-driving look-up table.
Specifically, in other embodiments of the invention described above, overdrive base table and multiple zoom factors is set, compared
In setting multiple over-driving look-up tables, data volume can be effectively reduced, so as to reduce occupancy and data to data space
Carrying cost.
It should be noted that because over-driving look-up table is needed for each former frame grey decision-making and present frame grey decision-making
One grey decision-making of overdriving of combination settings, thus at least need 256 rows to multiply 256 column datas in over-driving look-up table, data volume
Very big, so substantial amounts of data are required to take substantial amounts of resource in computing and storage, in order to solve the problem, lifting money
Source utilization rate, the over-driving look-up table described in step S2 of the invention be compression after over-driving look-up table, corresponding institute
It is also the base table of overdriving after compression to state base table of overdriving, and normally only multiplies 8 column datas including 8 rows or 16 rows multiply 16 column datas.
Step S3, liquid crystal display panel work is driven according to the over-driving look-up table of the acquisition.
Specifically, when the over-driving look-up table after the over-driving look-up table in the step S2 is compression, in the step
Worked in rapid S3 in order to liquid crystal display panel described in driven, the present invention is in the lookup of overdriving got described in utilization
Before the work of table- driven liquid crystal display panel, the over-driving look-up table obtained in the step S2 can also be decompressed, obtained
Over-driving look-up table after decompression, over-driving look-up table after using decompression drive the liquid crystal display panel to work, and one
As decompression after over-driving look-up table multiply 256 column datas including at least 256 rows.
Further, the method for the over-driving look-up table being decompressed in the step S3 is：To the mistake obtained in step S2
Look-up table is driven to carry out linear interpolation, the over-driving look-up table after being decompressed.
By the above method, the present invention can realize the change of the refreshing frequency according to liquid crystal display panel, adjust automatically
The over-driving look-up table of liquid crystal display panel, ensure that liquid crystal display device is respectively provided with high-quality display effect under different refreshing frequencys
Fruit.
When it is implemented, the over-driving method of the invention described above liquid crystal display panel can be by driving the LCD
The time schedule controller of plate is completed, and the mapping relations of refreshing frequency and over-driving look-up table and corresponds to the more of multiple refreshing frequencys respectively
Individual over-driving look-up table or described overdrive and correspond to multiple zoom factors of multiple different refreshing frequencys and can protected base table respectively
In the presence of in the memory being connected with the time schedule controller.
Referring to Fig. 2, the present invention also provides a kind of over-driving device of liquid crystal display panel, including：Determining unit 21, with
The connected acquiring unit 22 of the determining unit 21 and the driver element 23 being connected with the acquiring unit 22；
The determining unit 21, the video source is determined for receiving video source signal, and according to the video source signal
The refreshing frequency of signal；
The acquiring unit 22, refresh frequency for over-driving look-up table, difference according to corresponding to refreshing frequency acquisition
Over-driving look-up table corresponding to rate is different；
The driver element 23, for driving liquid crystal display panel work according to the over-driving look-up table of the acquisition.
Specifically, the determining unit 21 determines the refreshing frequency mistake of the video source signal according to the video source signal
Journey specifically includes：
Decompression draws pixel clock signal from the video source signal, and detects the frequency of the pixel clock signal；
It is calculated according to the frequency of the pixel clock signal and default refreshing frequency calculation formula presently described
The refreshing frequency of liquid crystal display panel；
Wherein, the default refreshing frequency calculation formula is：Refresh=PCLKRefresh/ (V_total*H_
total)；
Wherein, Refresh is the refreshing frequency of liquid crystal display panel, and PCLKRefresh is the frequency of pixel clock signal,
V_total is the total data of default horizontal direction scanning, and H_total is the row data of default vertical scan direction.
Specifically, as shown in figure 3, the process that the determining unit 21 detects the frequency of the pixel clock signal is specifically wrapped
Include：
At least two phase shift and frequency identical sampled clock signals successively are provided；
The high level of the pixel clock signal is gathered by the sampled clock signal, and counts and collects the pixel
The bar number of the sampled clock signal of the high level of clock signal；
When calculating pixel according to the bar number of the sampled clock signal of the high level for collecting the pixel clock signal
The high level duration of clock signal；
According to the frequency of the high level duration calculation pixel clock signal of the pixel clock signal, the pixel clock letter
Number frequency be equal to 1/ (2T), T is the high level duration of pixel clock signal；
Wherein, twice of the cycle of the sampled clock signal more than the cycle of the pixel clock signal；The pixel
The computational methods of the high level duration of clock signal are：The time of T=t1*n, t1 between two adjacent sampled clock signals
Interval, n is the bar number of the sampled clock signal for the high level for collecting the pixel clock signal.
For example, as shown in Figure 3, there is provided five successively sampled clock signal CCLK1, CCLK2 of phase shift, CCLK3,
CCLK4 and CCLK5, the time interval between two adjacent sampled clock signals is t1, as can be seen from Figure 3, sampling clock
Signal CCLK1, CCLK2, CCLK3, CCLK4 have collected pixel clock signal PCLK high level, namely collect the picture
The bar number of the sampled clock signal of plain clock signal PCLK high level is four, the high level of the pixel clock signal PCLK
When a length of 4t1, and generally pixel clock signal PCLK dutycycle is 50% in liquid crystal display device, therefore
The frequency of the pixel clock signal PCLK is 1/ (8t1).
It is understood that in order to reduce the error of the pixel clock signal PCLK of detecting frequency, allow in hardware
Under the conditions of, it should try one's best between the sampled clock signal of more a plurality of number is provided and reduces the time between adjacent sampled clock signal
Every.
Optionally, in order to further lift the accuracy of the pixel clock signal PCLK of detecting frequency, the step
In S1, multiple repairing weld can also be carried out to the high level of the pixel clock signal by the sampled clock signal, and accordingly
Multiple frequencies of the pixel clock signal are obtained, then calculate the average value of multiple frequencies of the pixel clock signal, with institute
State frequency of the average value of multiple frequencies as the pixel clock signal for calculating refreshing frequency.
At the same time, in order to further lift precision, the more of the pixel clock signal are calculated in the determining unit 21
The maximum and minimum value in multiple frequencies of the pixel clock signal can also be removed before the average value of individual frequency.
Preferably, the determining unit 21 is built in the time schedule controller for driving the liquid crystal display panel work, and
Sampled clock signal is produced by the time schedule controller for driving the liquid crystal display panel to work, more particularly by SECO
Phaselocked loop (Phase Locked Loop, PLL) in device produces.
Specifically, in some embodiments of the invention, the mistake according to corresponding to obtaining the refreshing frequency of acquiring unit 22
Driving look-up table detailed process be：Closed according to the refreshing frequency from the mapping of default refreshing frequency and over-driving look-up table
Corresponding over-driving look-up table is found in system.
For example, the refreshing for 60HZ~65HZ, 65HZ~70HZ, 75HZ~80HZ, 50HZ~55HZ and 45HZ~50HZ
Frequency is correspondingly arranged the first over-driving look-up table, the second over-driving look-up table, the 3rd over-driving look-up table, the 4th overdrived respectively
Look-up table and the 5th over-driving look-up table；When the refreshing frequency of the video source signal detected is 60Hz, then according to upper
Stating mapping relationship searching can obtain：The refreshing frequency of the video source signal is that over-driving look-up table corresponding to 60Hz is the first drive excessively
Dynamic look-up table.
Specifically, in other embodiments of the present invention, acquiring unit 22 is according to corresponding to obtaining the refreshing frequency
The detailed process of over-driving look-up table can also be：
Zoom factor corresponding with the refreshing frequency is found according to the refreshing frequency.
For example, the refreshing for 60HZ~65HZ, 65HZ~70HZ, 75HZ~80HZ, 50HZ~55HZ and 45HZ~50HZ
Base table zoom factor corresponding to frequency range be respectively the first zoom factor a1, the second zoom factor a2, the 3rd zoom factor a3,
4th zoom factor a4 and the 5th zoom factor a5, when the refreshing frequency of the video source signal detected is 60Hz
When, then it can be obtained according to above-mentioned mapping relationship searching：The refreshing frequency of the video source signal is that zoom factor is corresponding to 60Hz
First zoom factor a1.
According to the zoom factor and default base table of overdriving, corresponding over-driving look-up table is obtained, it is described to overdrive
Base table is extremely drive data corresponding to default refreshing frequency.
Specifically, the default scaling algorithm is：M=N*a；Wherein, M is the data in over-driving look-up table, and N was
The data in base table are driven, a is zoom factor.If it should be noted that after scaling in the over-driving look-up table data it is big
In 255, then the data just take 255, namely M and N are that span is：[0,255].
For example, when the refreshing frequency is 60Hz, then each data in the base table of overdriving are multiplied by
One zoom factor a1, you can obtain over-driving look-up table corresponding to 60Hz.
Specifically, in other embodiments of the invention described above, overdrive base table and multiple zoom factors is set, compared
In setting multiple over-driving look-up tables, data volume can be effectively reduced, so as to reduce occupancy and data to data space
Carrying cost.
It should be noted that because over-driving look-up table is needed for each former frame grey decision-making and present frame grey decision-making
One grey decision-making of overdriving of combination settings, thus at least need 256 rows to multiply 256 column datas in over-driving look-up table, data volume
Very big, so substantial amounts of data are required to take substantial amounts of resource in computing and storage, in order to solve the problem, lifting money
Source utilization rate, the over-driving look-up table described in step S2 of the invention be compression after over-driving look-up table, corresponding institute
It is also the base table of overdriving after compression to state base table of overdriving, and normally only multiplies 8 column datas including 8 rows or 16 rows multiply 16 column datas.
Specifically, when the over-driving look-up table after the over-driving look-up table that the acquiring unit 22 obtains is compression,
Worked in the driver element 23 in order to liquid crystal display panel described in driven, it drives in crossing for being got described in utilization
Before dynamic lookup table- driven liquid crystal display panel work, the over-driving look-up table that can be also obtained to the acquiring unit 22 solve
Pressure, the over-driving look-up table after being decompressed, over-driving look-up table after using decompression drive the liquid crystal display panel
Over-driving look-up table after work, typically decompression multiplies 256 column datas including at least 256 rows.
Further, the method that the driver element 23 decompresses the over-driving look-up table is：Acquiring unit 22 is obtained
Over-driving look-up table carry out linear interpolation, the over-driving look-up table after being decompressed.
By the above method, the present invention can realize the change of the refreshing frequency according to liquid crystal display panel, adjust automatically
The over-driving look-up table of liquid crystal display panel, ensure that liquid crystal display device is respectively provided with high-quality display effect under different refreshing frequencys
Fruit.
When it is implemented, determining unit 21, acquiring unit in the over-driving device of the invention described above liquid crystal display panel
22 and driver element 23 be built in the time schedule controller for driving the liquid crystal display panel, the memory cell 24 for institute
State the connected memory of time schedule controller.
In summary, the present invention provides a kind of over-driving method of liquid crystal display panel, comprises the following steps：Receive video
Source signal, and determine according to the video source signal refreshing frequency of the video source signal；Obtained according to the refreshing frequency
Corresponding over-driving look-up table, over-driving look-up table corresponding to different refreshing frequencys are different；Looked into according to overdriving for the acquisition
Table- driven liquid crystal display panel is looked for work, can be according to the change of the refreshing frequency of liquid crystal display device, adjust automatically liquid crystal
Show the over-driving look-up table of panel, ensure that liquid crystal display device is respectively provided with high-quality display effect under different refreshing frequencys.This
Invention also provides a kind of over-driving device of liquid crystal display panel, can according to the change of the refreshing frequency of liquid crystal display device,
The over-driving look-up table of adjust automatically liquid crystal display panel, it is high-quality to ensure that liquid crystal display device is respectively provided with different refreshing frequencys
Display effect.
It is described above, for the person of ordinary skill of the art, can be with technique according to the invention scheme and technology
Other various corresponding changes and deformation are made in design, and all these changes and deformation should all belong to the claims in the present invention
Protection domain.
Claims (10)
1. a kind of over-driving method of liquid crystal display panel, it is characterised in that comprise the following steps：
Step S1, video source signal is received, and the refreshing frequency of the video source signal is determined according to the video source signal；
Step S2, the over-driving look-up table according to corresponding to obtaining the refreshing frequency, overdrives corresponding to different refreshing frequencys and looks into
Look for table different；
Step S3, liquid crystal display panel work is driven according to the over-driving look-up table of the acquisition.
2. the over-driving method of liquid crystal display panel as claimed in claim 1, it is characterised in that the step S2 includes：
Corresponding mistake is found in mapping relations according to the refreshing frequency from default refreshing frequency with over-driving look-up table
Drive look-up table.
3. the over-driving method of liquid crystal display panel as claimed in claim 1, it is characterised in that the step S2 includes：
Zoom factor corresponding with the refreshing frequency is found according to the refreshing frequency；
According to the zoom factor and default base table of overdriving, corresponding over-driving look-up table, the base table of overdriving are obtained
For over-driving look-up table corresponding to default refreshing frequency.
4. the over-driving method of liquid crystal display panel as claimed in claim 1, it is characterised in that obtained in the step S2
Over-driving look-up table is the over-driving look-up table after compression, and the step S3 includes：
The over-driving look-up table obtained in depressurization steps S2, the over-driving look-up table after being decompressed；
Utilize the over-driving look-up table driving liquid crystal display panel work after decompression.
5. the over-driving method of liquid crystal display panel as claimed in claim 4, it is characterised in that overdriving after the compression
Look-up table is the list lattice of 8 row 8 or the list lattice of 16 row 16, and the over-driving look-up table after the decompression is the list lattice of 256 row 256.
6. the over-driving method of liquid crystal display panel as claimed in claim 4, it is characterised in that by being obtained in step S2
Over-driving look-up table carry out linear interpolation, the over-driving look-up table after being decompressed.
7. the over-driving method of liquid crystal display panel as claimed in claim 3, it is characterised in that according to the zoom factor and
Default base table of overdriving, the formula for obtaining corresponding over-driving look-up table are：M=N*a；Wherein, M is in over-driving look-up table
Data, N is the data overdrived in base table, and a is zoom factor.
A kind of 8. over-driving device of liquid crystal display panel, it is characterised in that including：Determining unit (21) and the determination are single
First (21) connected acquiring unit (22) and the driver element (23) being connected with the acquiring unit (22)；
The determining unit (21), determine that the video source is believed for receiving video source signal, and according to the video source signal
Number refreshing frequency；
The acquiring unit (22), for over-driving look-up table, different refreshing frequencys according to corresponding to refreshing frequency acquisition
Corresponding over-driving look-up table is different；
The driver element (23), for driving liquid crystal display panel work according to the over-driving look-up table of the acquisition.
9. the over-driving device of liquid crystal display panel as claimed in claim 8, it is characterised in that the over-driving device also wraps
Include the memory cell (24) being connected with the acquiring unit (22)；
The memory cell (24), for storing the mapping relations of refreshing frequency and over-driving look-up table and corresponding to multiple brushes respectively
Multiple over-driving look-up tables of new frequency；The acquiring unit (22) is according to the refreshing frequency from default refreshing frequency and mistake
Drive in the mapping relations of look-up table and find corresponding over-driving look-up table.
10. the over-driving device of liquid crystal display panel as claimed in claim 8, it is characterised in that the over-driving device is also
Including the memory cell (24) being connected with the acquiring unit (22)；
The memory cell (24), overdrive base table for storing and correspond to multiple scalings of multiple different refreshing frequencys respectively
Coefficient, the base table of overdriving are extremely drive data corresponding to default refreshing frequency；
The acquiring unit (22) finds zoom factor corresponding with the refreshing frequency according to the refreshing frequency, and according to institute
Zoom factor and default base table of overdriving are stated, obtains corresponding over-driving look-up table.
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