CN107945756B - White balance method and device of liquid crystal display panel - Google Patents
White balance method and device of liquid crystal display panel Download PDFInfo
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- CN107945756B CN107945756B CN201711168948.8A CN201711168948A CN107945756B CN 107945756 B CN107945756 B CN 107945756B CN 201711168948 A CN201711168948 A CN 201711168948A CN 107945756 B CN107945756 B CN 107945756B
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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
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Abstract
The invention provides a white balance method and a white balance device of a liquid crystal display panel. The method comprises the following steps: receiving a video source signal, and determining the refresh frequency of the video source signal according to the video source signal; acquiring a white balance data driving table corresponding to a first refreshing frequency and a second refreshing frequency of a liquid crystal display panel which are measured in advance; performing linear interpolation according to the refresh frequency of the video source signal and the white balance data driving tables corresponding to the first refresh frequency and the second refresh frequency of the liquid crystal display panel to obtain the white balance data driving table corresponding to the refresh frequency of the video source signal; and carrying out white balance processing on the liquid crystal display panel according to the white balance data driving table corresponding to the refreshing frequency of the video source signal, and accurately adjusting the white balance data driving table of the liquid crystal display panel according to the change of the refreshing frequency of the liquid crystal display device, thereby ensuring that the liquid crystal display device has high-quality display effect under different refreshing frequencies.
Description
Technical Field
The invention relates to the technical field of display, in particular to a white balance method and a white balance device of a liquid crystal display panel.
Background
With the development of Display technology, flat panel Display devices such as Liquid Crystal Displays (LCDs) have advantages of high image quality, power saving, thin body, and wide application range, and thus are widely used in various consumer electronics products such as mobile phones, televisions, personal digital assistants, digital cameras, notebook computers, and desktop computers, and become the mainstream of Display devices.
Most of the existing liquid crystal display devices in the market are backlight liquid crystal displays (lcds), which include a liquid crystal display panel and a backlight module (backlight module). The liquid crystal display panel has the working principle that liquid crystal molecules are placed in two parallel glass substrates, a plurality of vertical and horizontal fine wires are arranged between the two glass substrates, and the liquid crystal molecules are controlled to change directions by electrifying or not, so that light rays of the backlight module are refracted out to generate pictures.
In the conventional liquid crystal display panel, due to factors such as driving and characteristics of the liquid crystal display panel, displayed white field color coordinates are different to different degrees. For the white field color coordinate difference of the liquid crystal display device, if corresponding white balance adjustment is not performed, the color display effects of different liquid crystal display panels can be greatly different. Therefore, in the production process of the liquid crystal display panels, white tracking correction is usually performed to make the color displayed by each liquid crystal display panel consistent.
The conventional white balance process of the liquid crystal display panel includes: the white balance data of the liquid crystal display panel are obtained, the white balance of the liquid crystal display panel is carried out through the white balance data driving table, however, with the continuous development of display technology, the refreshing frequency of the liquid crystal display panel begins to become diversified, one liquid crystal display panel may have multiple refreshing frequencies, when the refreshing frequency of the liquid crystal display panel changes, the original white balance data driving table is still adopted to carry out white balance on the liquid crystal display panel, the best white balance effect cannot be achieved, the picture quality of the liquid crystal display panel is reduced, the picture quality under different refreshing frequencies is inconsistent, and the user experience and the product competitiveness of the liquid crystal display panel are reduced.
Disclosure of Invention
The invention aims to provide a white balance method of a liquid crystal display panel, which can accurately adjust a white balance data driving table of the liquid crystal display panel according to the change of the refreshing frequency of a liquid crystal display device and ensure that the liquid crystal display device has high-quality display effect under different refreshing frequencies.
The present invention also provides a white balance device of a liquid crystal display panel, which can accurately adjust a white balance data driving table of the liquid crystal display panel according to the change of the refresh frequency of the liquid crystal display device, and ensure that the liquid crystal display device has a good display effect under different refresh frequencies.
In order to achieve the above object, the present invention provides a white balance method of a liquid crystal display panel, comprising the steps of:
step S1, receiving a video source signal, and determining the refresh frequency of the video source signal according to the video source signal;
step S2, acquiring a white balance data driving table corresponding to a first refresh frequency and a second refresh frequency of a liquid crystal display panel which are measured in advance, wherein the refresh frequency of the video source signal is greater than the first refresh frequency and less than the second refresh frequency;
step S3, performing linear interpolation according to the refresh frequency of the video source signal and the white balance data driving table corresponding to the first refresh frequency and the second refresh frequency of the liquid crystal display panel to obtain the white balance data driving table corresponding to the refresh frequency of the video source signal;
and step S4, carrying out white balance processing on the liquid crystal display panel according to the white balance data driving table corresponding to the refreshing frequency of the video source signal.
The following steps are also included between the step S1 and the step S2:
respectively measuring a white balance data driving table corresponding to the maximum refreshing frequency, the minimum refreshing frequency and the conventional refreshing frequency of the liquid crystal display panel;
after the refresh frequency of the video source signal is determined, comparing the refresh frequency of the video source signal with the conventional refresh frequency, and if the refresh frequency of the video source signal is greater than the conventional refresh frequency, respectively setting the conventional refresh frequency and the maximum refresh frequency as the first refresh frequency and the second refresh frequency; and if the refresh frequency of the video source signal is less than the conventional refresh frequency, setting the first refresh frequency and the second refresh frequency by the minimum refresh frequency and the conventional refresh frequency respectively.
The white balance method of the liquid crystal display panel determines the maximum refreshing frequency, the minimum refreshing frequency and the conventional refreshing frequency of the liquid crystal display panel according to the specification of the time sequence controller corresponding to the liquid crystal display panel.
The step of determining a refresh rate of the video source signal from the video source signal comprises:
decompressing the video source signal to obtain a pixel clock signal, and detecting the frequency of the pixel clock signal;
and calculating the current refreshing frequency of the liquid crystal display panel according to the frequency of the pixel clock signal and a preset refreshing frequency calculation formula.
The preset refresh frequency calculation formula is as follows:
Refresh＝PCLKRefresh/(V_total*H_total)；
refresh is the Refresh frequency of the liquid crystal display panel, PCLKRefresh is the frequency of the pixel clock signal, V _ total is the total data scanned in the preset horizontal direction, and H _ total is the row data scanned in the preset vertical direction.
The step of detecting the frequency of the pixel clock signal comprises:
generating at least two sampling clock signals which are sequentially phase-shifted and have the same frequency;
acquiring the high level of the pixel clock signal through the sampling clock signal, and counting the number of the sampling clock signals of the high level of the pixel clock signal;
calculating the high-level duration of the pixel clock signal according to the number of the sampling clock signals of the high level of the pixel clock signal;
calculating the frequency of the pixel clock signal according to the high level duration of the pixel clock signal, wherein the frequency of the pixel clock signal is equal to 1/(2T), and T is the high level duration of the pixel clock signal;
wherein a period of the sampling clock signal is greater than twice a period of the pixel clock signal;
the method for calculating the high level duration of the pixel clock signal comprises the following steps: t1 × n, where T1 is the first time of the time interval between two adjacent sampling clock signals, and n is the number of sampling clock signals that have acquired the high level of the pixel clock signal.
The present invention also provides a white balance device of a liquid crystal display panel, comprising: the device comprises a determining unit, an acquiring unit connected with the determining unit, an interpolating unit connected with the acquiring unit and a processing unit connected with the interpolating unit;
the determining unit is used for receiving a video source signal and determining the refreshing frequency of the video source signal according to the video source signal;
the acquisition unit is used for acquiring a white balance data driving table corresponding to a first refreshing frequency and a second refreshing frequency of a liquid crystal display panel which are measured in advance, and the refreshing frequency of the video source signal is greater than the first refreshing frequency and less than the second refreshing frequency;
the interpolation unit is used for carrying out linear interpolation according to the refresh frequency of the video source signal and the white balance data driving tables corresponding to the first refresh frequency and the second refresh frequency of the liquid crystal display panel to obtain the white balance data driving tables corresponding to the refresh frequency of the video source signal;
and the processing unit is used for carrying out white balance processing on the liquid crystal display panel according to the white balance data driving table corresponding to the refreshing frequency of the video source signal.
The white balance device of the liquid crystal display panel further includes: a measuring unit and a comparing unit;
the measurement unit is used for respectively measuring a white balance data driving table corresponding to the maximum refreshing frequency, the minimum refreshing frequency and the conventional refreshing frequency of the liquid crystal display panel;
the comparison unit is connected with the determination unit and the acquisition unit and is used for comparing the refresh frequency of the video source signal with the conventional refresh frequency after the refresh frequency of the video source signal is determined, and if the refresh frequency of the video source signal is greater than the conventional refresh frequency, the conventional refresh frequency and the maximum refresh frequency are respectively set as the first refresh frequency and the second refresh frequency; and if the refresh frequency of the video source signal is less than the conventional refresh frequency, setting the first refresh frequency and the second refresh frequency by the minimum refresh frequency and the conventional refresh frequency respectively.
The white balance device of the liquid crystal display panel also comprises a storage unit connected with the measuring unit and the obtaining unit;
the storage unit is used for storing a white balance data driving table corresponding to the maximum refreshing frequency, the minimum refreshing frequency and the conventional refreshing frequency of the liquid crystal display panel.
The determining unit is further configured to decompress the video source signal to obtain a pixel clock signal, and detect a frequency of the pixel clock signal, so as to calculate a refresh frequency of the liquid crystal display panel according to the frequency of the pixel clock signal and a preset refresh frequency calculation formula;
the preset refresh frequency calculation formula is as follows:
Refresh＝PCLKRefresh/(V_total*H_total)；
refresh is the Refresh frequency of the liquid crystal display panel, PCLKRefresh is the frequency of the pixel clock signal, V _ total is the total data scanned in the preset horizontal direction, and H _ total is the row data scanned in the preset vertical direction.
The invention has the beneficial effects that: the invention provides a white balance method of a liquid crystal display panel, which comprises the following steps: receiving a video source signal, and determining the refresh frequency of the video source signal according to the video source signal; acquiring a white balance data driving table corresponding to a first refreshing frequency and a second refreshing frequency of a liquid crystal display panel which are measured in advance; performing linear interpolation according to the refresh frequency of the video source signal and the white balance data driving tables corresponding to the first refresh frequency and the second refresh frequency of the liquid crystal display panel to obtain the white balance data driving table corresponding to the refresh frequency of the video source signal; and carrying out white balance processing on the liquid crystal display panel according to the white balance data driving table corresponding to the refreshing frequency of the video source signal, and accurately adjusting the white balance data driving table of the liquid crystal display panel according to the change of the refreshing frequency of the liquid crystal display device, thereby ensuring that the liquid crystal display device has high-quality display effect under different refreshing frequencies. The invention also provides a white balance device of the liquid crystal display panel, which can accurately adjust the white balance data driving table of the liquid crystal display panel according to the change of the refreshing frequency of the liquid crystal display device, and ensure that the liquid crystal display device has high-quality display effect under different refreshing frequencies.
Drawings
For a better understanding of the nature and technical aspects of the present invention, reference should be made to the following detailed description of the invention, taken in conjunction with the accompanying drawings, which are provided for purposes of illustration and description and are not intended to limit the invention.
In the drawings, there is shown in the drawings,
FIG. 1 is a schematic diagram of a white balance device of a liquid crystal display panel according to the present invention;
FIG. 2 is a schematic diagram illustrating a step of detecting a frequency of a pixel clock signal in a white balance method of an LCD panel according to the present invention;
FIG. 3 is a flowchart illustrating a white balance method of a liquid crystal display panel according to the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Referring to fig. 3, the present invention provides a white balance method of a liquid crystal display panel, including the following steps:
step S1, receiving a video source signal, and determining the refresh frequency of the video source signal according to the video source signal;
step S2, acquiring a white balance data driving table corresponding to a first refresh frequency and a second refresh frequency of a liquid crystal display panel which are measured in advance, wherein the refresh frequency of the video source signal is greater than the first refresh frequency and less than the second refresh frequency;
step S3, performing linear interpolation according to the refresh frequency of the video source signal and the white balance data driving table corresponding to the first refresh frequency and the second refresh frequency of the liquid crystal display panel to obtain the white balance data driving table corresponding to the refresh frequency of the video source signal;
and step S4, carrying out white balance processing on the liquid crystal display panel according to the white balance data driving table corresponding to the refreshing frequency of the video source signal.
In step S1, the step of determining the refresh rate of the video source signal according to the video source signal specifically includes:
step S11, decompressing the video source signal to obtain a pixel clock signal, and detecting the frequency of the pixel clock signal;
step S12, calculating the refresh frequency of the current liquid crystal display panel according to the frequency of the pixel clock signal and a preset refresh frequency calculation formula;
wherein, the preset refresh frequency calculation formula is as follows: refresh ═ PCLKRefresh/(V _ total · H _ total);
refresh is the Refresh frequency of the liquid crystal display panel, PCLKRefresh is the frequency of the pixel clock signal, V _ total is the total data scanned in the preset horizontal direction, and H _ total is the row data scanned in the preset vertical direction.
Specifically, as shown in fig. 2, the process of detecting the frequency of the pixel clock signal in the step S11 specifically includes:
step S111, generating at least two sampling clock signals which are sequentially phase-shifted and have the same frequency;
step S112, acquiring the high level of the pixel clock signal through the sampling clock signal, and counting the number of the sampling clock signals of the high level of the pixel clock signal;
step S113, calculating the high-level duration of the pixel clock signal according to the number of the sampling clock signals of the high level of the pixel clock signal;
step S114, calculating the frequency of a pixel clock signal according to the high level duration of the pixel clock signal, wherein the frequency of the pixel clock signal is equal to 1/(2T), and T is the high level duration of the pixel clock signal;
wherein a period of the sampling clock signal is greater than twice a period of the pixel clock signal; the method for calculating the high level duration of the pixel clock signal comprises the following steps: t1 × n, where T1 is the first time of the time interval between two adjacent sampling clock signals, and n is the number of sampling clock signals that have acquired the high level of the pixel clock signal.
For example, as shown in fig. 2, five sampling clock signals CCLK1, CCLK2, CCLK3, CCLK4, and CCLK5 which are sequentially phase-shifted are generated, the time interval between two adjacent sampling clock signals is t1, as can be seen from fig. 2, the sampling clock signals CCLK1, CCLK2, CCLK3, and CCLK4 collect the high level of the pixel clock signal PCLK, that is, the number of sampling clock signals which collect the high level of the pixel clock signal PCLK is four, the duration of the high level of the pixel clock signal PCLK is 4t1, and the duty ratio of the pixel clock signal PCLK is 50% in the liquid crystal display device in general, so the frequency of the pixel clock signal PCLK is 1/(8t 1).
It is understood that, in order to reduce the error of the detected frequency of the pixel clock signal PCLK, more sampling clock signals should be provided and the time interval between adjacent sampling clock signals should be reduced as hardware allows.
Optionally, in order to further improve the accuracy of the frequency of the detected pixel clock signal PCLK, in step S1, the high level of the pixel clock signal may be sampled multiple times by the sampling clock signal, and multiple frequencies of the pixel clock signal are obtained through calculation according to the sampled high level of the pixel clock signal, and then an average value of the multiple frequencies of the pixel clock signal is calculated, and the average value of the multiple frequencies is used as the frequency of the pixel clock signal for calculating the refresh frequency. Meanwhile, in order to further improve the accuracy, in step S1, the maximum value and the minimum value of the plurality of frequencies of the pixel clock signal may be removed before calculating the average value of the plurality of frequencies of the pixel clock signal.
Preferably, the sampling clock signal is generated by a timing controller that drives the liquid crystal display panel to operate in step S111, and more specifically, is generated by a Phase Locked Loop (PLL) in the timing controller.
Further, the white balance method of the liquid crystal display panel further comprises the following steps:
step S21, respectively measuring a white balance data driving table corresponding to the maximum refreshing frequency, the minimum refreshing frequency and the conventional refreshing frequency of the liquid crystal display panel;
step S22, after determining the refresh frequency of the video source signal, comparing the refresh frequency of the video source signal with the normal refresh frequency, and if the refresh frequency of the video source signal is greater than the normal refresh frequency, setting the normal refresh frequency and the maximum refresh frequency to the first refresh frequency and the second refresh frequency, respectively; and if the refresh frequency of the video source signal is less than the conventional refresh frequency, setting the first refresh frequency and the second refresh frequency by the minimum refresh frequency and the conventional refresh frequency respectively.
In step S21, the maximum refresh frequency, the minimum refresh frequency, and the normal refresh frequency of the liquid crystal display panel are determined according to the specification of the timing controller corresponding to the liquid crystal display panel.
For example, in some embodiments of the present invention, the maximum refresh rate, the minimum refresh rate, and the normal refresh rate of the liquid crystal display panel may be 70Hz, 40Hz, and 60Hz, at this time, white balance data driving tables corresponding to the liquid crystal display panel at 70Hz, 40Hz, and 60Hz are measured, the refresh rate of the video source signal is compared with 60Hz, if the refresh rate of the video source signal is greater than 60Hz, linear interpolation is performed by using the white balance data driving tables corresponding to 70Hz and 60Hz to generate a white balance data driving table corresponding to the refresh rate of the video source signal, if the refresh rate of the video source signal is less than 60Hz, linear interpolation is performed by using the white balance data driving tables corresponding to 40Hz and 60Hz to generate a white balance data driving table corresponding to the refresh rate of the video source signal, and the white balance data driving table obtained by the linear interpolation can follow the variation of the refresh rate of the video source signal The change is realized, and the change precision is high.
By the method, the white balance data driving table of the liquid crystal display panel can be accurately adjusted according to the change of the refreshing frequency of the liquid crystal display panel, and the liquid crystal display device is ensured to have high-quality display effect under different refreshing frequencies
Referring to fig. 1, the present invention further provides a white balance device of a liquid crystal display panel, including: the device comprises a determination unit 21, an acquisition unit 22 connected with the determination unit 21, an interpolation unit 23 connected with the acquisition unit 22 and a processing unit 24 connected with the interpolation unit 23;
the determining unit 21 is configured to receive a video source signal, and determine a refresh frequency of the video source signal according to the video source signal;
the acquiring unit 22 is configured to acquire a white balance data driving table corresponding to a first refresh frequency and a second refresh frequency of a liquid crystal display panel, which are measured in advance, where the refresh frequency of the video source signal is greater than the first refresh frequency and less than the second refresh frequency;
the interpolation unit 23 is configured to perform linear interpolation according to the refresh frequency of the video source signal and the white balance data driving tables corresponding to the first refresh frequency and the second refresh frequency of the liquid crystal display panel, so as to obtain the white balance data driving table corresponding to the refresh frequency of the video source signal;
the processing unit 24 is configured to perform white balance processing on the liquid crystal display panel according to the white balance data driving table corresponding to the refresh frequency of the video source signal.
The determining unit 21 specifically determines the refresh frequency process of the video source signal according to the video source signal, including:
decompressing the video source signal to obtain a pixel clock signal, and detecting the frequency of the pixel clock signal;
calculating the refresh frequency of the current liquid crystal display panel according to the frequency of the pixel clock signal and a preset refresh frequency calculation formula;
wherein, the preset refresh frequency calculation formula is as follows: refresh ═ PCLKRefresh/(V _ total · H _ total);
refresh is the Refresh frequency of the liquid crystal display panel, PCLKRefresh is the frequency of the pixel clock signal, V _ total is the total data scanned in the preset horizontal direction, and H _ total is the row data scanned in the preset vertical direction.
Specifically, as shown in fig. 2, the detecting the frequency of the pixel clock signal specifically includes:
generating at least two sampling clock signals which are sequentially phase-shifted and have the same frequency;
acquiring the high level of the pixel clock signal through the sampling clock signal, and counting the number of the sampling clock signals of the high level of the pixel clock signal;
calculating the high-level duration of the pixel clock signal according to the number of the sampling clock signals of the high level of the pixel clock signal;
calculating the frequency of the pixel clock signal according to the high level duration of the pixel clock signal, wherein the frequency of the pixel clock signal is equal to 1/(2T), and T is the high level duration of the pixel clock signal;
wherein a period of the sampling clock signal is greater than twice a period of the pixel clock signal; the method for calculating the high level duration of the pixel clock signal comprises the following steps: t1 × n, where T1 is the first time of the time interval between two adjacent sampling clock signals, and n is the number of sampling clock signals that have acquired the high level of the pixel clock signal.
For example, as shown in fig. 2, five sampling clock signals CCLK1, CCLK2, CCLK3, CCLK4, and CCLK5 which are sequentially phase-shifted are generated, the time interval between two adjacent sampling clock signals is t1, as can be seen from fig. 2, the sampling clock signals CCLK1, CCLK2, CCLK3, and CCLK4 collect the high level of the pixel clock signal PCLK, that is, the number of sampling clock signals which collect the high level of the pixel clock signal PCLK is four, the duration of the high level of the pixel clock signal PCLK is 4t1, and the duty ratio of the pixel clock signal PCLK is 50% in the liquid crystal display device in general, so the frequency of the pixel clock signal PCLK is 1/(8t 1).
It is understood that, in order to reduce the error of the detected frequency of the pixel clock signal PCLK, more sampling clock signals should be provided and the time interval between adjacent sampling clock signals should be reduced as hardware allows.
Optionally, in order to further improve the accuracy of the frequency of the detected pixel clock signal PCLK, in step S1, the high level of the pixel clock signal may be sampled multiple times by the sampling clock signal, and multiple frequencies of the pixel clock signal are obtained through calculation according to the sampled high level of the pixel clock signal, and then an average value of the multiple frequencies of the pixel clock signal is calculated, and the average value of the multiple frequencies is used as the frequency of the pixel clock signal for calculating the refresh frequency. Meanwhile, in order to further improve the accuracy, in step S1, the maximum value and the minimum value of the plurality of frequencies of the pixel clock signal may be removed before calculating the average value of the plurality of frequencies of the pixel clock signal.
Preferably, the sampling clock signal is generated by a timing controller that drives the liquid crystal display panel to operate, and more particularly, by a Phase Locked Loop (PLL) in the timing controller.
Further, the white balance device of the liquid crystal display panel further includes: a measuring unit 26, a comparing unit 25 connected to the determining unit 21 and the obtaining unit 22, and a storage unit 27 connected to the measuring unit 26 and the obtaining unit 22;
the measurement unit 26 is configured to measure white balance data driving tables corresponding to the maximum refresh frequency, the minimum refresh frequency, and the normal refresh frequency of the liquid crystal display panel, respectively;
the comparing unit 25 is configured to compare the refresh frequency of the video source signal with the normal refresh frequency after determining the refresh frequency of the video source signal, and set the normal refresh frequency and the maximum refresh frequency as the first refresh frequency and the second refresh frequency, respectively, if the refresh frequency of the video source signal is greater than the normal refresh frequency; and if the refresh frequency of the video source signal is less than the conventional refresh frequency, setting the first refresh frequency and the second refresh frequency by the minimum refresh frequency and the conventional refresh frequency respectively.
The memory unit 27 is used for storing a white balance data driving table corresponding to the maximum refreshing frequency, the minimum refreshing frequency and the conventional refreshing frequency of the liquid crystal display panel
The measurement unit 26 determines the maximum refresh frequency, the minimum refresh frequency and the normal refresh frequency of the liquid crystal display panel according to the specification of the timing controller corresponding to the liquid crystal display panel.
For example, in some embodiments of the present invention, the maximum refresh rate, the minimum refresh rate, and the normal refresh rate of the liquid crystal display panel may be 70Hz, 40Hz, and 60Hz, at this time, white balance data driving tables corresponding to the liquid crystal display panel at 70Hz, 40Hz, and 60Hz are measured, the refresh rate of the video source signal is compared with 60Hz, if the refresh rate of the video source signal is greater than 60Hz, linear interpolation is performed by using the white balance data driving tables corresponding to 70Hz and 60Hz to generate a white balance data driving table corresponding to the refresh rate of the video source signal, if the refresh rate of the video source signal is less than 60Hz, linear interpolation is performed by using the white balance data driving tables corresponding to 40Hz and 60Hz to generate a white balance data driving table corresponding to the refresh rate of the video source signal, and the white balance data driving table obtained by the linear interpolation can follow the variation of the refresh rate of the video source signal The change is realized, and the change precision is high.
In summary, the present invention provides a white balance method for a liquid crystal display panel, including the following steps: receiving a video source signal, and determining the refresh frequency of the video source signal according to the video source signal; acquiring a white balance data driving table corresponding to a first refreshing frequency and a second refreshing frequency of a liquid crystal display panel which are measured in advance; performing linear interpolation according to the refresh frequency of the video source signal and the white balance data driving tables corresponding to the first refresh frequency and the second refresh frequency of the liquid crystal display panel to obtain the white balance data driving table corresponding to the refresh frequency of the video source signal; and carrying out white balance processing on the liquid crystal display panel according to the white balance data driving table corresponding to the refreshing frequency of the video source signal, and accurately adjusting the white balance data driving table of the liquid crystal display panel according to the change of the refreshing frequency of the liquid crystal display device, thereby ensuring that the liquid crystal display device has high-quality display effect under different refreshing frequencies. The invention also provides a white balance device of the liquid crystal display panel, which can accurately adjust the white balance data driving table of the liquid crystal display panel according to the change of the refreshing frequency of the liquid crystal display device, and ensure that the liquid crystal display device has high-quality display effect under different refreshing frequencies.
As described above, it will be apparent to those skilled in the art that other various changes and modifications may be made based on the technical solution and concept of the present invention, and all such changes and modifications are intended to fall within the scope of the appended claims.
Claims (8)
1. A white balance method of a liquid crystal display panel is characterized by comprising the following steps:
step S1, receiving a video source signal, and determining the refresh frequency of the video source signal according to the video source signal;
step S2, acquiring a white balance data driving table corresponding to a first refresh frequency and a second refresh frequency of a liquid crystal display panel which are measured in advance, wherein the refresh frequency of the video source signal is greater than the first refresh frequency and less than the second refresh frequency;
step S3, performing linear interpolation according to the refresh frequency of the video source signal and the white balance data driving table corresponding to the first refresh frequency and the second refresh frequency of the liquid crystal display panel to obtain the white balance data driving table corresponding to the refresh frequency of the video source signal;
step S4, performing white balance processing on the liquid crystal display panel according to the white balance data driving table corresponding to the refreshing frequency of the video source signal;
the following steps are also included between step S1 and step S2:
respectively measuring a white balance data driving table corresponding to the maximum refreshing frequency, the minimum refreshing frequency and the conventional refreshing frequency of the liquid crystal display panel;
comparing the refresh frequency of the video source signal with the conventional refresh frequency, and if the refresh frequency of the video source signal is greater than the conventional refresh frequency, respectively setting the conventional refresh frequency and the maximum refresh frequency as the first refresh frequency and the second refresh frequency; and if the refresh frequency of the video source signal is less than the conventional refresh frequency, setting the first refresh frequency and the second refresh frequency by the minimum refresh frequency and the conventional refresh frequency respectively.
2. The white balancing method of the liquid crystal display panel according to claim 1, wherein a maximum refresh frequency, a minimum refresh frequency, and a normal refresh frequency of the liquid crystal display panel are determined according to a specification of a timing controller driving the liquid crystal display panel to operate.
3. The white balancing method of the liquid crystal display panel according to claim 1, wherein the step of determining the refresh frequency of the video source signal according to the video source signal comprises:
decompressing the video source signal to obtain a pixel clock signal, and detecting the frequency of the pixel clock signal;
and calculating the current refreshing frequency of the liquid crystal display panel according to the frequency of the pixel clock signal and a preset refreshing frequency calculation formula.
4. The white balance method of the lcd panel of claim 3, wherein the preset refresh frequency calculation formula is:
Refresh＝PCLKRefresh/(V_total*H_total)；
refresh is the Refresh frequency of the liquid crystal display panel, PCLKRefresh is the frequency of the pixel clock signal, V _ total is the total data scanned in the preset horizontal direction, and H _ total is the row data scanned in the preset vertical direction.
5. The method of claim 3, wherein the detecting the frequency of the pixel clock signal comprises:
generating at least two sampling clock signals which are sequentially phase-shifted and have the same frequency;
acquiring the high level of the pixel clock signal through the sampling clock signal, and counting the number of the sampling clock signals of the high level of the pixel clock signal;
calculating the high-level duration of the pixel clock signal according to the number of the sampling clock signals of the high level of the pixel clock signal;
calculating the frequency of the pixel clock signal according to the high level duration of the pixel clock signal, wherein the frequency of the pixel clock signal is equal to 1/(2T), and T is the high level duration of the pixel clock signal;
wherein a period of the sampling clock signal is greater than twice a period of the pixel clock signal;
the method for calculating the high level duration of the pixel clock signal comprises the following steps: t1 × n, where T1 is the first time of the time interval between two adjacent sampling clock signals, and n is the number of sampling clock signals that have acquired the high level of the pixel clock signal.
6. A white balance device of a liquid crystal display panel, comprising: a determination unit (21), an acquisition unit (22) connected to the determination unit (21), an interpolation unit (23) connected to the acquisition unit (22), and a processing unit (24) connected to the interpolation unit (23);
the determining unit (21) is used for receiving a video source signal and determining the refreshing frequency of the video source signal according to the video source signal;
the acquisition unit (22) is used for acquiring a white balance data driving table corresponding to a first refresh frequency and a second refresh frequency of the liquid crystal display panel which are measured in advance, and the refresh frequency of the video source signal is greater than the first refresh frequency and less than the second refresh frequency;
the interpolation unit (23) is configured to perform linear interpolation according to the refresh frequency of the video source signal and the white balance data drive table corresponding to the first refresh frequency and the second refresh frequency of the liquid crystal display panel to obtain the white balance data drive table corresponding to the refresh frequency of the video source signal;
the processing unit (24) is used for carrying out white balance processing on the liquid crystal display panel according to a white balance data driving table corresponding to the refreshing frequency of the video source signal;
the white balance device of the liquid crystal display panel further includes: a measuring unit (26) and a comparing unit (25);
the measurement unit (26) is used for respectively measuring a white balance data driving table corresponding to the maximum refreshing frequency, the minimum refreshing frequency and the conventional refreshing frequency of the liquid crystal display panel;
the comparing unit (25) is connected with the determining unit (21) and the obtaining unit (22) and is used for comparing the refresh frequency of the video source signal with the conventional refresh frequency after the refresh frequency of the video source signal is determined, and if the refresh frequency of the video source signal is greater than the conventional refresh frequency, the conventional refresh frequency and the maximum refresh frequency are respectively set as the first refresh frequency and the second refresh frequency; and if the refresh frequency of the video source signal is less than the conventional refresh frequency, setting the first refresh frequency and the second refresh frequency by the minimum refresh frequency and the conventional refresh frequency respectively.
7. The white balance device of the liquid crystal display panel according to claim 6, further comprising a storage unit (27) connected to both the measuring unit (26) and the obtaining unit (22);
the storage unit (27) is used for storing a white balance data driving table corresponding to the maximum refreshing frequency, the minimum refreshing frequency and the conventional refreshing frequency of the liquid crystal display panel.
8. The white balance device of the LCD panel according to claim 6, wherein the determining unit (21) is further configured to decompress the pixel clock signal from the video source signal and detect the frequency of the pixel clock signal, so as to calculate the refresh frequency of the LCD panel according to the frequency of the pixel clock signal and a preset refresh frequency calculation formula;
the preset refresh frequency calculation formula is as follows:
Refresh＝PCLKRefresh/(V_total*H_total)；
refresh is the Refresh frequency of the liquid crystal display panel, PCLKRefresh is the frequency of the pixel clock signal, V _ total is the total data scanned in the preset horizontal direction, and H _ total is the row data scanned in the preset vertical direction.
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| CN108877714A (en) * | 2018-07-19 | 2018-11-23 | 深圳市华星光电技术有限公司 | Liquid crystal display and its over-driving method, memory |
| CN109637425A (en) * | 2019-01-29 | 2019-04-16 | 惠科股份有限公司 | A kind of driving method, drive module and display device |
| CN111292668B (en) * | 2020-03-30 | 2022-09-27 | Tcl华星光电技术有限公司 | Method and device for adjusting refresh frequency of display panel |
| CN111312191B (en) * | 2020-04-01 | 2021-04-27 | Tcl华星光电技术有限公司 | Time schedule controller, gray scale voltage adjusting method and liquid crystal display panel |
| CN111326095B (en) * | 2020-04-07 | 2022-07-12 | Tcl华星光电技术有限公司 | White balance adjusting system and method thereof |
| CN111641820B (en) * | 2020-05-21 | 2021-08-03 | Tcl华星光电技术有限公司 | White balance adjusting method and device of liquid crystal display panel |
| CN111540329B (en) * | 2020-05-25 | 2022-01-25 | Tcl华星光电技术有限公司 | Time schedule controller, control method thereof and display device |
| CN113707069A (en) * | 2021-08-30 | 2021-11-26 | Tcl华星光电技术有限公司 | Time schedule controller, display terminal and display compensation method |
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