CN107945756A - The white balance method and device of liquid crystal display panel - Google Patents
The white balance method and device of liquid crystal display panel Download PDFInfo
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- CN107945756A CN107945756A CN201711168948.8A CN201711168948A CN107945756A CN 107945756 A CN107945756 A CN 107945756A CN 201711168948 A CN201711168948 A CN 201711168948A CN 107945756 A CN107945756 A CN 107945756A
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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
- 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
- G09G3/3618—Control of matrices with row and column drivers with automatic refresh of the display panel using sense/write circuits
Abstract
The present invention provides a kind of white balance 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；Obtain the first refreshing frequency and the corresponding white balance data driving table of the second refreshing frequency of the liquid crystal display panel measured in advance；According to the corresponding white balance data driving table of the first refreshing frequency and the second refreshing frequency of the refreshing frequency of the video source signal and liquid crystal display panel, linear interpolation is carried out, draws the corresponding white balance data driving table of refreshing frequency of the video source signal；White balance processing is carried out to liquid crystal display panel according to the corresponding white balance data driving table of the refreshing frequency of the video source signal, can be according to the change of the refreshing frequency of liquid crystal display device, the white balance data driving table of accurate adjustment liquid crystal display panel, ensures that liquid crystal display device is respectively provided with good display effect under different refreshing frequencys.
Description
Technical field
The present invention relates to the white balance method and device of display technology field, more particularly to a kind of liquid crystal display panel.
Background technology
With the development of display technology, 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, a number
The various consumption electronic products such as word assistant, digital camera, laptop, desktop computer, become 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, there are many tiny electric wires vertically and horizontally among two panels glass substrate, by controlling liquid crystal whether energization
Molecular changes direction, generation picture is reflected by the light of backlight module.
The factor such as existing liquid crystal display panel, driving and characteristic due to liquid crystal display panel, it is shown out it is white
All there are different degrees of difference for field chromaticity coordinates.For the white field chromaticity coordinates difference of liquid crystal display device, such as without corresponding
Blank level adjustment, then the color rendering effect between different liquid crystal display panels will have larger difference.Therefore in liquid crystal
White balance tracking correction would generally be carried out in the production process of display panel, so that the color that every liquid crystal display panel is shown becomes
In consistent.
The white balance process of existing liquid crystal display panel includes：The white balance data of liquid crystal display panel is obtained, and is led to
Cross the white balance data driving table and white balance is carried out to the liquid crystal display panel, however as the continuous hair of Display Technique
Exhibition, the refreshing frequency of liquid crystal display panel start to become variation, and a liquid crystal display panel may have a variety of refresh frequently
Rate, when the refreshing frequency change of liquid crystal display panel, still drives table to the LCD display using original white balance data
Plate carries out white balance, can not reach optimal white balance effect, cause the image quality of liquid crystal display panel to decline, difference brush
Image quality appearance under new frequency is inconsistent, reduces the user experience and product competitiveness of liquid crystal display panel.
The content of the invention
, can be according to liquid crystal display device it is an object of the invention to provide a kind of white balance method of liquid crystal display panel
Refreshing frequency change, the accurate white balance data driving table for adjusting liquid crystal display panel, ensures liquid crystal display device not
With being respectively provided with good display effect under refreshing frequency.
The present invention also aims to provide a kind of white balancing apparatus of liquid crystal display panel, can be filled according to liquid crystal display
The change for the refreshing frequency put, the accurate white balance data driving table for adjusting liquid crystal display panel, ensures that liquid crystal display device exists
Good display effect is respectively provided with different refreshing frequencys.
To achieve the above object, the present invention provides a kind of white balance method of liquid crystal display panel, include 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 first refreshing frequency and the second refreshing frequency for obtaining the liquid crystal display panel measured in advance are corresponding white
Equilibrium criterion drives table, and the refreshing frequency of the video source signal is more than the first refreshing frequency and is less than the second refreshing frequency；
Step S3, according to the refreshing frequency of the video source signal and the first refreshing frequency of liquid crystal display panel and
The corresponding white balance data driving table of two refreshing frequencys, carries out linear interpolation, draws the refreshing frequency pair of the video source signal
The white balance data driving table answered；
Step S4, table is driven to LCD display according to the corresponding white balance data of refreshing frequency of the video source signal
Plate carries out white balance processing.
Following steps are further included between the step S1 and step S2：
The maximum refreshing frequency, minimum refreshing frequency and conventional refreshing frequency for measuring the liquid crystal display panel respectively correspond to
White balance data driving table；
Determine the video source signal refreshing frequency after, by the refreshing frequency of the video source signal with it is described often
Rule refreshing frequency is compared, will be described normal if the refreshing frequency of the video source signal is more than the conventional refreshing frequency
Rule refreshing frequency and maximum refreshing frequency set first refreshing frequency and the second refreshing frequency respectively；If the video source letter
Number refreshing frequency be less than the conventional refreshing frequency, then the minimum refreshing frequency and conventional refreshing frequency are set described respectively
First refreshing frequency and the second refreshing frequency.
Rule of the white balance method of the liquid crystal display panel according to the corresponding time schedule controller of the liquid crystal display panel
Lattice, determine the maximum refreshing frequency, minimum refreshing frequency and conventional refreshing frequency of the liquid crystal display panel.
It is described the video source signal is determined according to the video source signal refreshing frequency the step of include：
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.
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.
The step of frequency of the detecting pixel clock signal, includes：
Produce at least two phase shift and the identical sampled clock signals of frequency successively；
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 computational methods of the high level duration of the pixel clock signal are：When T=t1*n, t1 are two adjacent samplings
Time interval between clock signal is at the first time, n is the sampling clock letter for the high level for collecting the pixel clock signal
Number bar number.
The present invention also provides a kind of white balancing apparatus of liquid crystal display panel, including：Determination unit, be connected with determination unit
Acquiring unit, the interpolating unit that the acquiring unit is connected and the processing unit being connected with the interpolating unit；
The determination unit, determines that the video source is believed for receiving video source signal, and according to the video source signal
Number refreshing frequency；
The acquiring unit, the first refreshing frequency and second for obtaining the liquid crystal display panel measured in advance refresh frequency
The corresponding white balance data driving table of rate, the refreshing frequency of the video source signal are more than the first refreshing frequency and less than the second brush
New frequency；
The interpolating unit, for the refreshing frequency according to the video source signal and the first brush of liquid crystal display panel
The corresponding white balance data of new frequency and the second refreshing frequency drives table, carries out linear interpolation, draws the video source signal
The corresponding white balance data driving table of refreshing frequency；
The processing unit, for the corresponding white balance data driving table pair of refreshing frequency according to the video source signal
Liquid crystal display panel carries out white balance processing.
The white balancing apparatus of the liquid crystal display panel further includes：Measuring unit and comparing unit；
The measuring unit, for the maximum refreshing frequency for measuring the liquid crystal display panel respectively, minimum refreshing frequency
White balance data corresponding with conventional refreshing frequency drives table；
The comparing unit is connected with determination unit and acquiring unit, for determining the refreshing of the video source signal
After frequency, by the refreshing frequency of the video source signal compared with the conventional refreshing frequency, if the video source is believed
Number refreshing frequency be more than the conventional refreshing frequency, then the conventional refreshing frequency and maximum refreshing frequency are set into institute respectively
State the first refreshing frequency and the second refreshing frequency；If the refreshing frequency of the video source signal is less than the conventional refreshing frequency,
Then the minimum refreshing frequency and conventional refreshing frequency set first refreshing frequency and the second refreshing frequency respectively.
The white balancing apparatus of the liquid crystal display panel further includes the storage list being connected with measuring unit and acquiring unit
Member；
The storage unit, for storing the maximum refreshing frequency, minimum refreshing frequency and conventional brush of liquid crystal display panel
The newly corresponding white balance data driving table of frequency.
The determination unit, is additionally operable to the decompression from the video source signal and draws pixel clock signal, and described in detecting
The frequency of pixel clock signal, so that according to the frequency of the pixel clock signal and default refreshing frequency calculation formula meter
Calculate the refreshing frequency for drawing presently described liquid crystal display panel；
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.
Beneficial effects of the present invention：The present invention provides a kind of white balance method of liquid crystal display panel, includes 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；Acquisition measures in advance
Liquid crystal display panel the first refreshing frequency and the second refreshing frequency corresponding white balance data driving table；According to the video
The refreshing frequency of source signal and the first refreshing frequency of liquid crystal display panel and the corresponding white balance data of the second refreshing frequency
Table is driven, carries out linear interpolation, draws the corresponding white balance data driving table of refreshing frequency of the video source signal；According to institute
The corresponding white balance data driving table of refreshing frequency for stating video source signal carries out white balance processing to liquid crystal display panel, can
According to the change of the refreshing frequency of liquid crystal display device, the accurate white balance data driving table for adjusting liquid crystal display panel, ensures
Liquid crystal display device is respectively provided with good display effect under different refreshing frequencys.The present invention also provides a kind of liquid crystal display panel
White balancing apparatus, can be accurate to adjust the white flat of liquid crystal display panel according to the change of the refreshing frequency of liquid crystal display device
Weigh data-driven table, ensures that liquid crystal display device is respectively provided with good display effect under different refreshing frequencys.
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 attached drawing, however attached drawing only provide with reference to and explanation use, be not used for being any limitation as the present invention.
In attached drawing,
Fig. 1 is the schematic diagram of the white balancing apparatus of the liquid crystal display panel of the present invention；
Fig. 2 is the step of detecting the frequency of pixel clock signal in the white balance method of the liquid crystal display panel of the present invention
Schematic diagram；
Fig. 3 is the flow chart of the white balance 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 attached drawing are described in detail.
Referring to Fig. 3, the present invention provides a kind of white balance method of liquid crystal display panel, include 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 first refreshing frequency and the second refreshing frequency for obtaining the liquid crystal display panel measured in advance are corresponding white
Equilibrium criterion drives table, and the refreshing frequency of the video source signal is more than the first refreshing frequency and is less than the second refreshing frequency；
Step S3, according to the refreshing frequency of the video source signal and the first refreshing frequency of liquid crystal display panel and
The corresponding white balance data driving table of two refreshing frequencys, carries out linear interpolation, draws the refreshing frequency pair of the video source signal
The white balance data driving table answered；
Step S4, table is driven to LCD display according to the corresponding white balance data of refreshing frequency of the video source signal
Plate carries out white balance processing.
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, as shown in Fig. 2, the process for the frequency for detecting the pixel clock signal in the step S11 is specific
Including：
Step S111, at least two phase shift and the identical sampled clock signals of frequency 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
At intervals of at the first time, 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 Fig. 2, 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 2, sampling clock
Signal CCLK1, CCLK2, CCLK3, CCLK4 have collected the high level of pixel clock signal PCLK, namely collect the picture
The bar number of the sampled clock signal of the high level of plain clock signal PCLK is four, the high level of the pixel clock signal PCLK
When a length of 4t1, and the duty cycle of pixel clock signal PCLK is 50% under normal circumstances 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 frequency of the pixel clock signal PCLK of detecting, allow in hardware
Under the conditions of, it should try one's best and the sampled clock signal of more a plurality of number is provided and reduces time interval between adjacent sampled clock signal.
Optionally, in order to further lift the accuracy of the frequency of the pixel clock signal PCLK of detecting, 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 calculated, then calculate the average value of multiple frequencies of the pixel clock signal,
The frequency of the pixel clock signal for calculating refreshing frequency is used as using the average value of the multiple frequency.At the same time, in order to
Precision is further lifted, can be with the step S1, before the average value for the multiple frequencies for calculating the pixel clock signal
Remove the maximum and minimum value in multiple frequencies of the pixel clock signal.
Preferably, sampling is produced by the time schedule controller for driving the liquid crystal display panel to work in the step S111
Clock signal, is more particularly produced by the phaselocked loop (Phase Locked Loop, PLL) in time schedule controller.
Further, the white balance method of the liquid crystal display panel further includes following steps：
Step S21, the maximum refreshing frequency, minimum refreshing frequency and conventional refreshing of the liquid crystal display panel are measured respectively
The corresponding white balance data driving table of frequency；
Step S22, after the refreshing frequency of the video source signal is determined, by the refreshing frequency of the video source signal
Compared with the conventional refreshing frequency, if the refreshing frequency of the video source signal is more than the conventional refreshing frequency,
The conventional refreshing frequency and maximum refreshing frequency are set into first refreshing frequency and the second refreshing frequency respectively；It is if described
The refreshing frequency of video source signal is less than the conventional refreshing frequency, then the minimum refreshing frequency and conventional refreshing frequency are distinguished
Set first refreshing frequency and the second refreshing frequency.
Wherein, the specification in the above-mentioned steps S21 according to the corresponding time schedule controller of the liquid crystal display panel, determines
The maximum refreshing frequency of the liquid crystal display panel, minimum refreshing frequency and conventional refreshing frequency.
For example, in some embodiments of the invention, the maximum refreshing frequency of the liquid crystal display panel, minimum brush
New frequency and conventional refreshing frequency can be respectively 70Hz, 40Hz and 60Hz, first measure the liquid crystal display panel respectively at this time
The corresponding white balance data driving table in 70Hz, 40Hz and 60Hz, then again by the refreshing frequency of video source signal with
60Hz is compared, if the refreshing frequency of video source signal is more than 60Hz, with the white balance corresponding to the 70Hz and 60Hz
Data-driven table carries out linear interpolation, the corresponding white balance data driving table of refreshing frequency of video source signal is produced, if video
The refreshing frequency of source signal is less than 60Hz, then is linearly inserted with the white balance data driving table corresponding to the 40Hz and 60Hz
Value, produces the corresponding white balance data driving table of refreshing frequency of video source signal, the white balance number obtained by linear interpolation
It can change according to driving table with the change of the refreshing frequency of video source signal, and it is high to change precision.
By the above method, the present invention can realize the change of the refreshing frequency according to liquid crystal display panel, accurate adjustment
The white balance data driving table of liquid crystal display panel, it is good aobvious to ensure that liquid crystal display device is respectively provided with different refreshing frequencys
Show effect
Referring to Fig. 1, the present invention also provides a kind of white balancing apparatus of liquid crystal display panel, including：Determination unit 21, with
The connected interpolating unit 23 of the connected acquiring unit 22 of determination unit 21, the acquiring unit 22 and with 23 phase of interpolating unit
Processing unit 24 even；
The determination 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, the first refreshing frequency and second for obtaining the liquid crystal display panel measured in advance refresh
The corresponding white balance data driving table of frequency, the refreshing frequency of the video source signal are more than the first refreshing frequency and less than second
Refreshing frequency；
The interpolating unit 23, for the refreshing frequency and the first of liquid crystal display panel according to the video source signal
Refreshing frequency and the corresponding white balance data driving table of the second refreshing frequency, carry out linear interpolation, draw the video source signal
Refreshing frequency corresponding white balance data driving table；
The processing unit 24, for the corresponding white balance data driving table of refreshing frequency according to the video source signal
White balance processing is carried out to liquid crystal display panel.
Wherein, the determination unit 21 determines the refreshing frequency process of the video source signal according to the video source signal
Specifically include：
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 Fig. 2, the process of the frequency of the detecting pixel clock signal specifically includes：
Produce at least two phase shift and the identical sampled clock signals of frequency successively；
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
At intervals of at the first time, 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 Fig. 2, 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 2, sampling clock
Signal CCLK1, CCLK2, CCLK3, CCLK4 have collected the high level of pixel clock signal PCLK, namely collect the picture
The bar number of the sampled clock signal of the high level of plain clock signal PCLK is four, the high level of the pixel clock signal PCLK
When a length of 4t1, and the duty cycle of pixel clock signal PCLK is 50% under normal circumstances 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 frequency of the pixel clock signal PCLK of detecting, allow in hardware
Under the conditions of, it should try one's best and the sampled clock signal of more a plurality of number is provided and reduces time interval between adjacent sampled clock signal.
Optionally, in order to further lift the accuracy of the frequency of the pixel clock signal PCLK of detecting, 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 calculated, then calculate the average value of multiple frequencies of the pixel clock signal,
The frequency of the pixel clock signal for calculating refreshing frequency is used as using the average value of the multiple frequency.At the same time, in order to
Precision is further lifted, can be with the step S1, before the average value for the multiple frequencies for calculating the pixel clock signal
Remove the maximum and minimum value in multiple frequencies of the pixel clock signal.
Preferably, the sampled clock signal is by driving the time schedule controller of the liquid crystal display panel work to produce, more
Particularly produced by the phaselocked loop (Phase Locked Loop, PLL) in time schedule controller.
Further, the white balancing apparatus of the liquid crystal display panel further includes：Measuring unit 26, with determination unit 21 and
Acquiring unit 22 homogeneously connects comparing unit 25 and the storage unit 27 being connected with measuring unit 26 and acquiring unit 22；
The measuring unit 26, for the maximum refreshing frequency for measuring the liquid crystal display panel respectively, minimum refreshing frequency
Rate white balance data driving table corresponding with conventional refreshing frequency；
The comparing unit 25, for after the refreshing frequency of the video source signal is determined, the video source to be believed
Number refreshing frequency compared with the conventional refreshing frequency, if the refreshing frequency of the video source signal is more than the routine
Refreshing frequency, then set first refreshing frequency and second by the conventional refreshing frequency and maximum refreshing frequency and refresh respectively
Frequency；If the refreshing frequency of the video source signal is less than the conventional refreshing frequency, the minimum refreshing frequency and routine
Refreshing frequency sets first refreshing frequency and the second refreshing frequency respectively.
The storage unit 27, for storing the maximum refreshing frequency, minimum refreshing frequency and routine of liquid crystal display panel
The corresponding white balance data driving table of refreshing frequency
Wherein, specification of the measuring unit 26 according to the corresponding time schedule controller of the liquid crystal display panel, determines institute
State the maximum refreshing frequency, minimum refreshing frequency and conventional refreshing frequency of liquid crystal display panel.
For example, in some embodiments of the invention, the maximum refreshing frequency of the liquid crystal display panel, minimum brush
New frequency and conventional refreshing frequency can be respectively 70Hz, 40Hz and 60Hz, first measure the liquid crystal display panel respectively at this time
The corresponding white balance data driving table in 70Hz, 40Hz and 60Hz, then again by the refreshing frequency of video source signal with
60Hz is compared, if the refreshing frequency of video source signal is more than 60Hz, with the white balance corresponding to the 70Hz and 60Hz
Data-driven table carries out linear interpolation, the corresponding white balance data driving table of refreshing frequency of video source signal is produced, if video
The refreshing frequency of source signal is less than 60Hz, then is linearly inserted with the white balance data driving table corresponding to the 40Hz and 60Hz
Value, produces the corresponding white balance data driving table of refreshing frequency of video source signal, the white balance number obtained by linear interpolation
It can change according to driving table with the change of the refreshing frequency of video source signal, and it is high to change precision.
In conclusion the present invention provides a kind of white balance method of liquid crystal display panel, include the following steps：Receive video
Source signal, and determine according to the video source signal refreshing frequency of the video source signal；Obtain the liquid crystal measured in advance
Show the first refreshing frequency and the corresponding white balance data driving table of the second refreshing frequency of panel；According to the video source signal
The corresponding white balance data driving table of the first refreshing frequency and the second refreshing frequency of refreshing frequency and liquid crystal display panel, into
Row linear interpolation, draws the corresponding white balance data driving table of refreshing frequency of the video source signal；According to the video source
The corresponding white balance data driving table of refreshing frequency of signal carries out white balance processing to liquid crystal display panel, can be according to liquid crystal
The change of the refreshing frequency of display device, the accurate white balance data driving table for adjusting liquid crystal display panel, ensures liquid crystal display
Device is respectively provided with good display effect under different refreshing frequencys.The present invention also provides a kind of white balance of liquid crystal display panel
Device, can be according to the change of the refreshing frequency of liquid crystal display device, and the accurate white balance data for adjusting liquid crystal display panel drives
Dynamic table, ensures that liquid crystal display device is respectively provided with good display effect under different refreshing frequencys.
The above, for those of ordinary skill in 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 white balance method of liquid crystal display panel, it is characterised in that include 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 first refreshing frequency and the corresponding white balance of the second refreshing frequency of the liquid crystal display panel measured in advance are obtained
Data-driven table, the refreshing frequency of the video source signal are more than the first refreshing frequency and are less than the second refreshing frequency；
Step S3, brushed according to the refreshing frequency of the video source signal and the first refreshing frequency of liquid crystal display panel and second
The newly corresponding white balance data driving table of frequency, carries out linear interpolation, show that the refreshing frequency of the video source signal is corresponding
White balance data drives table；
Step S4, according to the corresponding white balance data driving table of the refreshing frequency of the video source signal to liquid crystal display panel into
The processing of row white balance.
2. the white balance method of liquid crystal display panel as claimed in claim 1, it is characterised in that step S1 and step S2 it
Between further include following steps：
Maximum refreshing frequency, the minimum refreshing frequency for measuring the liquid crystal display panel respectively are corresponding with conventional refreshing frequency white
Equilibrium criterion drives table；
By the refreshing frequency of the video source signal compared with the conventional refreshing frequency, if the brush of the video source signal
New frequency is more than the conventional refreshing frequency, then the conventional refreshing frequency and maximum refreshing frequency is set described first respectively
Refreshing frequency and the second refreshing frequency；If the refreshing frequency of the video source signal is less than the conventional refreshing frequency, described
Minimum refreshing frequency and conventional refreshing frequency set first refreshing frequency and the second refreshing frequency respectively.
3. the white balance method of liquid crystal display panel as claimed in claim 2, it is characterised in that according to the driving liquid crystal
Show the specification of the time schedule controller of panel work, determine the maximum refreshing frequency of the liquid crystal display panel, minimum refreshing frequency
With conventional refreshing frequency.
4. the white balance method of liquid crystal display panel as claimed in claim 1, it is characterised in that described to be believed according to the video source
Number determine the video source signal refreshing frequency the step of include：
Decompression draws pixel clock signal from the video source signal, and detects the frequency of the pixel clock signal；
Presently described liquid crystal is calculated according to the frequency of the pixel clock signal and default refreshing frequency calculation formula
The refreshing frequency of display panel.
5. the white balance method of liquid crystal display panel as claimed in claim 4, it is characterised in that the default refreshing frequency meter
Calculating formula is：
Refresh=PCLKRefresh/ (V_total*H_total)；
Wherein, Refresh be liquid crystal display panel refreshing frequency, PCLKRefresh be pixel clock signal frequency, V_
Total is the total data of default horizontal direction scanning, and H_total is the row data of default vertical scan direction.
6. the white balance method of liquid crystal display panel as claimed in claim 4, it is characterised in that the detecting pixel clock letter
Number frequency the step of include：
Produce at least two phase shift and the identical sampled clock signals of frequency successively；
The high level of the pixel clock signal is gathered by the sampled clock signal, and counts and collects the pixel clock
The bar number of the sampled clock signal of the high level of signal；
Pixel clock letter is calculated according to the bar number of the sampled clock signal of the high level for collecting the pixel clock signal
Number high level duration；
According to the frequency of the high level duration calculation pixel clock signal of the pixel clock signal, the pixel clock signal
Frequency 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 computational methods of the high level duration of the pixel clock signal are：T=t1*n, t1 are that two adjacent sampling clocks are believed
Time interval between number is at the first time, n is the sampled clock signal for the high level for collecting the pixel clock signal
Bar number.
A kind of 7. white balancing apparatus of liquid crystal display panel, it is characterised in that including：Determination unit (21) and determination unit
(21) the connected interpolating unit (23) of connected acquiring unit (22), the acquiring unit (22) and with the interpolating unit (23)
Connected processing unit (24)；
The determination unit (21), determines 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), the first refreshing frequency and second for obtaining the liquid crystal display panel measured in advance refresh frequency
The corresponding white balance data driving table of rate, the refreshing frequency of the video source signal are more than the first refreshing frequency and less than the second brush
New frequency；
The interpolating unit (23), for the refreshing frequency according to the video source signal and the first brush of liquid crystal display panel
The corresponding white balance data of new frequency and the second refreshing frequency drives table, carries out linear interpolation, draws the video source signal
The corresponding white balance data driving table of refreshing frequency；
The processing unit (24), for the corresponding white balance data driving table pair of refreshing frequency according to the video source signal
Liquid crystal display panel carries out white balance processing.
8. the white balancing apparatus of liquid crystal display panel as claimed in claim 7, it is characterised in that further include：Measuring unit
(26) and comparing unit (25)；
The measuring unit (26), for the maximum refreshing frequency for measuring the liquid crystal display panel respectively, minimum refreshing frequency
White balance data corresponding with conventional refreshing frequency drives table；
The comparing unit (25) is connected with determination unit (26) and acquiring unit (22), for determining the video source letter
Number refreshing frequency after, by the refreshing frequency of the video source signal compared with the conventional refreshing frequency, if described
The refreshing frequency of video source signal is more than the conventional refreshing frequency, then by the conventional refreshing frequency and maximum refreshing frequency point
First refreshing frequency and the second refreshing frequency are not set；If the refreshing frequency of the video source signal is less than the conventional brush
New frequency, then the minimum refreshing frequency and conventional refreshing frequency set first refreshing frequency and second and refresh frequently respectively
Rate.
9. the white balancing apparatus of liquid crystal display panel as claimed in claim 8, it is characterised in that further include and measuring unit
(26) and the connected storage unit (27) of acquiring unit (22)；
The storage unit (27), for storing the maximum refreshing frequency, minimum refreshing frequency and conventional brush of liquid crystal display panel
The newly corresponding white balance data driving table of frequency.
10. the white balancing apparatus of liquid crystal display panel as claimed in claim 7, it is characterised in that the determination unit (21),
It is additionally operable to the decompression from the video source signal and draws pixel clock signal, and detects the frequency of the pixel clock signal, from
And presently described liquid crystal is calculated according to the frequency and default refreshing frequency calculation formula of the pixel clock signal
Show the refreshing frequency of panel；
The default refreshing frequency calculation formula is：
Refresh=PCLKRefresh/ (V_total*H_total)；
Wherein, Refresh be liquid crystal display panel refreshing frequency, PCLKRefresh be pixel clock signal frequency, V_
Total is the total data of default horizontal direction scanning, and H_total is the row data of default vertical scan direction.
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Address after: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Patentee after: TCL Huaxing Photoelectric Technology Co.,Ltd. Address before: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Patentee before: Shenzhen China Star Optoelectronics Technology Co.,Ltd. |