CN108169932B - Flicker adjusting method and device based on rapid JEITA algorithm - Google Patents

Flicker adjusting method and device based on rapid JEITA algorithm Download PDF

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CN108169932B
CN108169932B CN201711224796.9A CN201711224796A CN108169932B CN 108169932 B CN108169932 B CN 108169932B CN 201711224796 A CN201711224796 A CN 201711224796A CN 108169932 B CN108169932 B CN 108169932B
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value
flicker
liquid crystal
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jeita
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CN108169932A (en
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张付强
秦明
梁红军
赵正
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Wuhan Jingli Electronic Technology Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
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Abstract

The invention discloses a Flicker adjusting method and a Flicker adjusting device based on a rapid JEITA algorithm, wherein the adjusting process comprises the following steps: setting an initial Vcom value of the liquid crystal module, and acquiring a first Flicker value of the liquid crystal module through a quick JEITA algorithm; adjusting a Vcom value of the liquid crystal module, and acquiring a second Flicker value of the liquid crystal module through a quick JEITA algorithm; if the second Flicker value is larger than the first Flicker value, the Vcom value of the liquid crystal module is adjusted towards the second direction, and a third Flicker value of the liquid crystal module is obtained; if the second Flicker value is smaller than the first Flicker value, the Vcom value of the liquid crystal module is adjusted towards the first direction, and a third Flicker value of the liquid crystal module is obtained; and taking the Vcom value corresponding to the third Flicker value as the Vcom configuration value of the liquid crystal module. The Flicker value is obtained by combining the quick JEITA algorithm and the standard JEITA algorithm, the Flicker value is closer to the real feeling of human eyes, and the method has the advantages of high speed, high precision, stable measurement and good consistency and can meet the clamping control requirement of a high-quality liquid crystal screen.

Description

Flicker adjusting method and device based on rapid JEITA algorithm
Technical Field
The invention belongs to the technical field of liquid crystal panel detection, and particularly relates to a Flicker adjusting method and device based on a rapid JEITA algorithm.
Background
In the use process of the liquid crystal panel, the horizontal stripes Flicker phenomenon, which is generally called Flicker phenomenon, is generated due to the polarity switching of the common electrode signal Vcom. The numerical value of Flicker also directly reflects the quality reliability of the liquid crystal panel. Generally, the smaller the value of Flicker value, the less risk of Image Sticking (IS) of the liquid crystal panel, and vice versa. Therefore, how to measure the magnitude of the Flicker value and control the Flicker value within a predetermined range is a problem to be faced in the design and manufacturing process of the liquid crystal panel.
In the prior art, the Flicker value is measured by methods such as FMA method, JEITA method and VESA method. The common point of the existing measuring methods is that Flicker is used for reflecting the visual perception of human eyes to Flicker. The FMA method uses alternating current components with brightness change to represent Flicker than direct current components, and is characterized in that the measurement is quick and simple, but the subjective feeling of human eyes on Flicker degrees with different frequencies cannot be reflected; the JEITA method and the VESA method measure decibel values of all flickering frequencies by FFT frequency division, integrate full frequency spectrum according to frequency response characteristics of human eyes or find the maximum decibel value, and are characterized by being more suitable for the human eyes to feel different flickering frequencies, and being more objective and stable in measuring result but lower in measuring speed.
Disclosure of Invention
The invention aims to solve the defects in the background technology and provides a quick Flicker adjusting method and device based on a quick JEITA algorithm, which are high in speed and precision.
The technical scheme adopted by the invention is as follows: a FLICKER adjusting method based on a rapid JEITA algorithm comprises the following steps:
step 1, setting an initial Vcom value of a liquid crystal module, and acquiring a first Flicker value of the liquid crystal module through a quick JEITA algorithm;
step 2, adjusting the Vcom value of the liquid crystal module according to the first direction, and obtaining a second Flicker value of the liquid crystal module through a quick JEITA algorithm;
step 3, comparing the second Flicker value with the first Flicker value,
if the second Flicker value is larger than the first Flicker value, the Vcom value of the liquid crystal module is adjusted towards the second direction, and a third Flicker value of the liquid crystal module is obtained through a quick JEITA algorithm;
if the second Flicker value is smaller than the first Flicker value, the Vcom value of the liquid crystal module is adjusted towards the first direction, and a third Flicker value of the liquid crystal module is obtained through a rapid JEITA algorithm;
step 4, taking a Vcom value corresponding to the third Flicker value as a Vcom configuration value of the liquid crystal module;
the process of obtaining the Flicker value of the liquid crystal module through the rapid JEITA algorithm comprises the following steps: continuously collecting the brightness signals of the liquid crystal module for many times within 0.1-0.3S, and converting all the brightness signals into digital signals; and carrying out Fourier transform on all the digital signals to obtain the amplitudes of a group of signals with different frequencies, and calculating a Flicker value according to the amplitudes of the signals with different frequencies.
Further, the step 3 further comprises the following steps:
adjusting the Vcom value of the liquid crystal module according to a second direction, sequentially obtaining a group of Flicker values, and taking the minimum value as a third Flicker value; or
And regulating the Vcom value of the liquid crystal module according to the first direction, sequentially obtaining a group of Flicker values, and taking the minimum value as a third Flicker value.
Further, continuous collection 2 within 0.1-0.3SnThe brightness signal of the sub-liquid crystal module, n is a natural number.
Further, the value of n is 8, 9 or 10.
And further, adjusting a Vcom value corresponding to the third Flicker value to be the Vcom value of the liquid crystal module, and obtaining the final Flicker value of the liquid crystal module through a standard JEITA algorithm.
Further, the process of obtaining the Flicker value of the liquid crystal module through the standard JEITA algorithm is as follows: continuously collecting the brightness signals of the liquid crystal module for many times within 1-4S, and converting all the brightness signals into digital signals; and carrying out Fourier transform on all the digital signals to obtain the amplitudes of a group of signals with different frequencies, and calculating a Flicker value according to the amplitudes of the signals with different frequencies.
Further, the Flicker value is calculated by the following formula:
Figure BDA0001487035640000031
wherein P is0Amplitude corresponding to the DC component, PmaxMultiplying the magnitude of each frequency by a flicker weight factor yields the maximum of the weighted magnitudes.
A device for realizing the Flicker adjusting method based on the rapid JEITA algorithm comprises
The measuring probe is used for scanning the liquid crystal module to be measured provided with the Flicker picture to acquire a brightness signal of the liquid crystal module;
the analog-to-digital conversion device is used for receiving the brightness signal output by the measuring probe and converting the brightness signal into a digital signal;
the Fourier transform device is used for carrying out Fourier transform on the digital signals to obtain the amplitudes of the signals with different frequencies;
and the calculating device is used for calculating the Flicker value of the liquid crystal module according to the amplitudes of the signals with different frequencies.
Further, the calculation means calculates the Flicker value by the following formula:
Figure BDA0001487035640000032
wherein P is0Amplitude corresponding to the DC component, PmaxMultiplying the magnitude of each frequency by a flicker weight factor yields the maximum of the weighted magnitudes.
Furthermore, the device also comprises a parameter adjusting device which is used for sending a Vcom parameter adjusting command to the liquid crystal module according to the calculated Flicker value so as to enable the Flicker value of the liquid crystal module to accord with a preset target.
The invention has the beneficial effects that: in the process of obtaining the optimal Vcom value of the whole liquid crystal module, the Flicker value is obtained by adopting the rapid JEITA algorithm, so that the adjusting time can be greatly shortened, and the production efficiency is greatly improved by more than 6 times; and the final Flicker value is determined and obtained through a standard JEITA algorithm, so that higher precision can be ensured, and larger errors can be avoided. The Flicker value is obtained by combining the quick JEITA algorithm and the standard JEITA algorithm, the Flicker value is closer to the real feeling of human eyes, and the method has the advantages of high speed, high precision, stable measurement and good consistency and can meet the clamping control requirement of a high-quality liquid crystal screen.
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FIG. 1 is a flow chart of the regulation of the process of the present invention.
Fig. 2 is a schematic block diagram of the apparatus of the present invention.
Detailed Description
The invention will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the invention, but are for clear understanding.
As shown in FIG. 1, the FLICKER adjusting method based on the rapid JEITA algorithm of the invention comprises the following steps:
step 1, switching a liquid crystal module to a Flicker picture, and placing a measuring probe on the liquid crystal module;
step 2, setting an initial Vcom value of the liquid crystal module, and acquiring a first Flicker value of the liquid crystal module through a quick JEITA algorithm; the initial setting is carried out according to experience, and the experience value is not a unique value;
step 3, adjusting the Vcom value of the liquid crystal module according to the first direction (increasing or decreasing), and obtaining a second Flicker value of the liquid crystal module through a quick JEITA algorithm;
step 4, comparing the second Flicker value with the first Flicker value;
if the second Flicker value is larger than the first Flicker value, the Vcom value of the liquid crystal module is adjusted towards a second direction (reduced or increased), a group of Flicker values are sequentially obtained through a quick JEITA algorithm, each time one Flicker value is obtained, the Vcom value is compared with the Flicker value obtained last time, until the current Flicker value is larger than the Flicker value obtained last time, the value is stopped, then the smallest Flicker value in the process is taken as a third Flicker value, and the first direction is opposite to the second direction;
if the second Flicker value is smaller than the first Flicker value, the Vcom value of the liquid crystal module is adjusted towards the first direction (increased or decreased), a group of Flicker values are sequentially obtained through a quick JEITA algorithm, each time one Flicker value is obtained, the Vcom value is compared with the Flicker value obtained last time, until the current Flicker value is larger than the Flicker value obtained last time, the value is stopped to be taken, and then the smallest Flicker value in the process is taken as a third Flicker value;
step 5, taking a Vcom value corresponding to the third Flicker value as an optimal Vcom value of the liquid crystal module;
and 6, adjusting the Vcom value of the liquid crystal module to be the optimal Vcom value, acquiring the final flicker value of the liquid crystal module through a standard JEITA algorithm, and judging the excellent grade and the burning operation of the liquid crystal module according to the value.
In the scheme, the process of acquiring the Flicker value of the liquid crystal module through the rapid JEITA algorithm comprises the following steps: continuously collecting the brightness signals of the liquid crystal module for multiple times within 0.1-0.3S, preferably 0.1S, 0.2S or 0.3S, and converting all the brightness signals into digital signals (time domain signals); and carrying out Fourier transform on all the digital signals to obtain a group of amplitudes (frequency domain signals) of signals with different frequencies, and calculating a Flicker value according to the amplitudes of the signals with different frequencies.
In the above protocol, preferably, the 2 continuous collection is carried out over a period of 0.1-0.3SnThe brightness signal of the sub-liquid crystal module, n is a natural number.
In the above scheme, preferably, n is 8, 9 or 10.
In the scheme, the process of acquiring the Flicker value of the liquid crystal module through the standard JEITA algorithm comprises the following steps: continuous acquisition in 1-4S time 2nThe brightness signal of the sub liquid crystal module is preferably 1S or 2S or 3S or 4S, the value of n is 8 or 9 or 10, and all the brightness signals are converted into digital signals (time domain signals); and carrying out Fourier transform on all the digital signals to obtain a group of amplitudes (frequency domain signals) of signals with different frequencies, and calculating a Flicker value according to the amplitudes of the signals with different frequencies.
In the scheme, the Flicker value is calculated by the following formula:
Figure BDA0001487035640000061
wherein P is0Amplitude corresponding to the DC component, PmaxMultiplying the magnitude of each frequency by a flicker weight factor yields the maximum of the weighted magnitudes.
The human eye's perception of flicker drops from 30Hz, and when the frequency exceeds 60Hz, the human eye's perception of flicker drops substantially, even if the presence of flicker is not perceived at all. Therefore, the invention considers the weight factor of human eyes to the Flicker frequency, and applies the Flicker weight factor to the calculation standard when calculating the Flicker value, so that the measurement is stable, the consistency is good, and the real feeling of human eyes is more approximate.
The time of the standard JEITA measurement is 1S/time, the rapid JEITA algorithm can be improved to 0.1S/time, and enough stability can be ensured. In the Flicker adjustment process, JEITA measurement needs to be repeatedly performed, and assuming that each Flicker adjustment requires about 20 measurements, the total adjustment time of the conventional standard JEITA measurement is 1(S) × 20 ═ 20(S), whereas the rapid JEITA adjustment algorithm in the present invention requires about 0.1(S) × 20+1(S) ═ 3S. It can be seen that the adjusting algorithm of the invention can greatly shorten the Flicker adjusting time and improve the production efficiency by times.
The invention also provides a device for realizing the Flicker adjusting method based on the rapid JEITA algorithm, as shown in fig. 2, comprising:
the measuring probe 2 is used for scanning the liquid crystal module 1 to be measured provided with the Flicker picture to obtain a brightness signal of the liquid crystal module;
the analog-to-digital conversion device 3 is used for receiving the brightness signal output by the measuring probe and converting the brightness signal into a digital signal;
the Fourier transform device 4 performs Fourier transform on the digital signals to acquire the amplitudes of the signals with different frequencies;
and the calculating device 5 is used for calculating the Flicker value of the liquid crystal module according to the amplitudes of the signals with different frequencies. The calculating means calculates a Flicker value by the following formula:
Figure BDA0001487035640000071
wherein P is0Amplitude corresponding to the DC component, PmaxMultiplying the magnitude of each frequency by a flicker weight factor yields the maximum of the weighted magnitudes.
And the parameter adjusting device 6 is used for sending a Vcom parameter adjusting command to the liquid crystal module according to the calculated Flicker value so as to enable the Flicker value of the liquid crystal module to accord with a preset target.
Those not described in detail in this specification are within the skill of the art.

Claims (7)

1. A Flicker adjusting method based on a rapid JEITA algorithm is characterized by comprising the following steps:
step 1, setting an initial Vcom value of a liquid crystal module, and acquiring a first Flicker value of the liquid crystal module through a quick JEITA algorithm;
step 2, adjusting the Vcom value of the liquid crystal module according to the first direction, and obtaining a second Flicker value of the liquid crystal module through a quick JEITA algorithm;
step 3, comparing the second Flicker value with the first Flicker value,
if the second Flicker value is larger than the first Flicker value, the Vcom value of the liquid crystal module is adjusted towards the second direction, and a third Flicker value of the liquid crystal module is obtained through a quick JEITA algorithm;
if the second Flicker value is smaller than the first Flicker value, the Vcom value of the liquid crystal module is adjusted towards the first direction, and a third Flicker value of the liquid crystal module is obtained through a rapid JEITA algorithm;
step 4, taking a Vcom value corresponding to the third Flicker value as a Vcom configuration value of the liquid crystal module;
the process of obtaining the Flicker value of the liquid crystal module through the rapid JEITA algorithm comprises the following steps: continuously collecting the brightness signals of the liquid crystal module for many times within 0.1-0.3S, and converting all the brightness signals into digital signals; fourier transform is carried out on all the digital signals to obtain amplitude values of a group of signals with different frequencies, and Flicker values are calculated according to the amplitude values of the signals with different frequencies;
the Vcom value corresponding to the third Flicker value is adjusted to be the Vcom value of the liquid crystal module, and the final Flicker value of the liquid crystal module is obtained through a standard JEITA algorithm;
the process of obtaining the Flicker value of the liquid crystal module through the standard JEITA algorithm comprises the following steps: continuously collecting the brightness signals of the liquid crystal module for many times within 1-4S, and converting all the brightness signals into digital signals; and carrying out Fourier transform on all the digital signals to obtain the amplitudes of a group of signals with different frequencies, and calculating a Flicker value according to the amplitudes of the signals with different frequencies.
2. The Flicker adjustment method based on the rapid JEITA algorithm according to claim 1, wherein the step 3 further comprises the following steps:
adjusting the Vcom value of the liquid crystal module according to a second direction, sequentially obtaining a group of Flicker values, and taking the minimum value as a third Flicker value; or
And regulating the Vcom value of the liquid crystal module according to the first direction, sequentially obtaining a group of Flicker values, and taking the minimum value as a third Flicker value.
3. The Flicker adjustment method based on the rapid JEITA algorithm according to claim 1, wherein: continuous collection 2 within 0.1-0.3SnThe brightness signal of the sub-liquid crystal module, n is a natural number.
4. The Flicker adjustment method based on the rapid JEITA algorithm according to claim 3, wherein: the value of n is 8, 9 or 10.
5. The Flicker adjustment method based on the rapid JEITA algorithm as claimed in claim 1, wherein the Flicker value is calculated by the following formula:
Figure 546902DEST_PATH_IMAGE002
whereinP 0 Is the corresponding amplitude of the direct current component,P max multiplying the magnitude of each frequency by a flicker weight factor yields the maximum of the weighted magnitudes.
6. An apparatus for implementing the quickjeita algorithm-based Flicker adjusting method as claimed in claim 1, wherein: comprises that
The measuring probe is used for scanning the liquid crystal module to be measured provided with the Flicker picture to acquire a brightness signal of the liquid crystal module;
the analog-to-digital conversion device is used for receiving the brightness signal output by the measuring probe and converting the brightness signal into a digital signal;
the Fourier transform device is used for carrying out Fourier transform on the digital signals to obtain the amplitudes of the signals with different frequencies;
the calculating device is used for calculating Flicker values of the liquid crystal module according to the amplitudes of the signals with different frequencies;
the parameter adjusting device is used for sending a Vcom parameter adjusting command to the liquid crystal module according to the calculated Flicker value so as to enable the Flicker value of the liquid crystal module to accord with a preset target;
the parameter adjustment comprises the following steps: comparing the second Flicker value with the first Flicker value, and if the second Flicker value is larger than the first Flicker value, adjusting the Vcom value of the liquid crystal module towards the second direction; and if the second Flicker value is smaller than the first Flicker value, adjusting the Vcom value of the liquid crystal module towards the first direction.
7. The apparatus according to claim 6, wherein the calculating means calculates the Flicker value by the following formula:
Figure DEST_PATH_IMAGE003
whereinP 0 Is the corresponding amplitude of the direct current component,P max multiplying the magnitude of each frequency by a flicker weight factor yields the maximum of the weighted magnitudes.
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CN109143628B (en) * 2018-09-14 2021-09-28 武汉帆茂电子科技有限公司 Device and method for displaying flicker and Vcom values in real time on liquid crystal module
CN109166505A (en) * 2018-10-23 2019-01-08 惠科股份有限公司 Display panel detection method and device and display device
CN110491317B (en) * 2019-07-09 2024-01-30 深圳市汉弘达电子科技有限公司 LCM flash control automatic burning device and LCM flash control automatic burning method
CN110428761B (en) * 2019-07-10 2022-11-25 武汉精立电子技术有限公司 Method, device and system for non-contact measurement of Flicker value of liquid crystal module
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