CN116504160A - Method, device, equipment and storage medium for evaluating liquid crystal panel flex electric effect - Google Patents
Method, device, equipment and storage medium for evaluating liquid crystal panel flex electric effect Download PDFInfo
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- CN116504160A CN116504160A CN202310341608.XA CN202310341608A CN116504160A CN 116504160 A CN116504160 A CN 116504160A CN 202310341608 A CN202310341608 A CN 202310341608A CN 116504160 A CN116504160 A CN 116504160A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 163
- 230000000694 effects Effects 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000002834 transmittance Methods 0.000 claims abstract description 106
- 238000005259 measurement Methods 0.000 claims description 25
- 238000011156 evaluation Methods 0.000 claims description 18
- 238000012545 processing Methods 0.000 claims description 15
- 238000004590 computer program Methods 0.000 claims description 11
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- 230000008859 change Effects 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 5
- 230000000007 visual effect Effects 0.000 abstract description 2
- 238000004891 communication Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 239000010409 thin film Substances 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 3
- 230000005684 electric field Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241001270131 Agaricus moelleri Species 0.000 description 1
- 206010036618 Premenstrual syndrome Diseases 0.000 description 1
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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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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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
- G02F1/1306—Details
- G02F1/1309—Repairing; Testing
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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
- G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/30—Computing systems specially adapted for manufacturing
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Abstract
The invention provides a method, a device, equipment and a storage medium for evaluating the flexoelectric effect of a liquid crystal panel, which are characterized in that through providing working voltage for the liquid crystal panel, different gray-scale images can be normally displayed, a switch of a TFT of the liquid crystal panel is turned on, driving signals required for measuring transmittance are provided for a Data signal line, screen brightness Data of the liquid crystal panel are obtained, a voltage versus transmittance curve is drawn according to the screen brightness Data, a transmittance sequence to be measured is selected from the voltage versus transmittance curve, corresponding flicker waveform Data under each transmittance in the transmittance sequence is measured, finally the flicker waveform Data is analyzed to evaluate the intensity of the flexoelectric effect, and compared with the traditional method for measuring the flexoelectric coefficient, the measuring difficulty is lower, the measuring result is more visual, and the influence of the flexoelectric effect on the display effect of the liquid crystal panel can be evaluated more accurately.
Description
Technical Field
The present invention relates to the field of liquid crystal panels, and in particular, to a method, an apparatus, a device, and a storage medium for evaluating a flexoelectric effect of a liquid crystal panel.
Background
The working principle of the liquid crystal panel is as follows: under the action of the electric field, the arrangement direction of the liquid crystal molecules is changed, so that the light transmitted by the light source through the liquid crystal panel is changed (modulated) to complete the electric-optical conversion. The deformation phenomenon in which liquid crystal molecules are subjected to electric fields to undergo splay and bend is called flexoelectric effect. The display effect of the liquid crystal panel is affected by the flexoelectric effect to some extent, so that research on the flexoelectric effect is one of the important contents in the field of liquid crystal panels nowadays.
The liquid crystal molecular flexoelectric effect is generally characterized using the splay and bend flexoelectric coefficients (e 1, e 3). Conventional methods of measuring the flex coefficient are typically optical path difference measurements and mixed-array test cell measurements. For the traditional method for measuring the flexoelectric coefficient, on one hand, a measuring system is more complicated, the flexoelectric coefficient of liquid crystal molecules is smaller, the measuring difficulty is high, and on the other hand, the effect of the flexoelectric effect on the actual display effect in the liquid crystal panel is related to various factors such as electrode shape, electrode structure, box thickness and the like, and the simple liquid crystal flexoelectric coefficient is difficult to intuitively evaluate the effect of the liquid crystal molecules on the display effect of the liquid crystal panel.
Disclosure of Invention
The invention provides a method, a device, equipment and a storage medium for evaluating a liquid crystal panel flexoelectric effect, which are used for solving the problems that a measurement system is complex, the measurement difficulty is high, and a simple liquid crystal flexoelectric coefficient is difficult to intuitively evaluate the influence of the simple liquid crystal flexoelectric coefficient on the display effect of the liquid crystal panel in the prior art, and realizing the intuitive evaluation of the influence of the flexoelectric effect on the display effect of the liquid crystal panel by utilizing a scintillation measurement method.
The invention provides a method for evaluating a liquid crystal panel flexoelectric effect, which comprises the following steps: providing working voltage for the tested liquid crystal panel;
opening a switch of a TFT of the liquid crystal panel, and providing a driving signal required for measuring transmittance for a Data signal line of the liquid crystal panel;
acquiring screen brightness data of the liquid crystal panel, and drawing a voltage-to-transmittance curve of the liquid crystal panel according to the screen brightness data;
selecting a transmittance sequence to be measured from the voltage-to-transmittance curve, and measuring corresponding flicker waveform data under each transmittance in the transmittance sequence;
and analyzing the flicker waveform data to evaluate the strength of the flexoelectric effect.
According to the method for evaluating the flexoelectric effect of the liquid crystal panel, which is provided by the invention, the flicker waveform data is analyzed to evaluate the strength of the flexoelectric effect, and the method specifically comprises the following steps:
acquiring frequency spectrum data corresponding to the flicker waveform data, and recording the corresponding flicker intensity at a specific frequency in the frequency spectrum data;
and drawing a change curve of the flicker intensity at the specific frequency and the transmittance, and evaluating the strength of the flexoelectric effect by comparing the flicker intensity of each measuring point of the change curve with the flicker intensity near the specific transmittance.
According to the method for evaluating the flexoelectric effect of the liquid crystal panel, the specific frequency is twice the signal frequency of the driving signal.
According to the method for evaluating the flexoelectric effect of the liquid crystal panel, the driving signals are square wave driving signals with different amplitudes from low to high.
According to the method for evaluating the flexoelectric effect of the liquid crystal panel, the frequency of the driving signal is half of the design working frequency of the liquid crystal panel.
According to the liquid crystal panel flexoelectric effect evaluation method provided by the invention, the frequency spectrum data corresponding to the flicker waveform is obtained by using fast Fourier transform.
The invention also provides a device for evaluating the flexoelectric effect of the liquid crystal panel, which comprises the following components: the device comprises a light receiving unit, a driving unit, a measurement and control unit and a data processing unit;
the light receiving unit is used for measuring brightness data of a screen of the liquid crystal panel;
the driving unit is used for providing working voltage for the tested liquid crystal panel, opening a switch of a TFT of the liquid crystal panel and providing driving signals required by measuring transmittance for a Data signal line of the liquid crystal panel;
the measurement and control unit is used for acquiring the brightness data and sending the brightness data to the data processing unit;
the data processing unit is used for acquiring screen brightness data of the liquid crystal panel, drawing a voltage versus transmittance curve of the liquid crystal panel according to the screen brightness data, selecting a transmittance sequence to be measured from the voltage versus transmittance curve, measuring corresponding flicker waveform data under each transmittance in the transmittance sequence, analyzing the flicker waveform data, and evaluating the strength of the flexoelectric effect of the flicker waveform data.
According to the liquid crystal panel flexoelectric effect evaluation device provided by the invention, the sampling rate of the measurement unit measuring unit is more than 10 thousand times per second.
The invention also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the method for evaluating the flexoelectric effect of the liquid crystal panel according to any one of the above when executing the program.
The present invention also provides a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a liquid crystal panel flexoelectric effect evaluation method as described in any one of the above.
According to the method, the device, the equipment and the storage medium for evaluating the flexoelectric effect of the liquid crystal panel, through providing the working voltage for the tested liquid crystal panel, the liquid crystal panel can normally display different gray-scale pictures, the TFT of the liquid crystal panel is turned on, driving signals required by measuring the transmittance are provided for the Data signal line of the liquid crystal panel, screen brightness Data of the liquid crystal panel are obtained, a voltage versus transmittance curve of the liquid crystal panel is drawn according to the screen brightness Data, a transmittance sequence to be measured is selected from the voltage versus transmittance curve, corresponding flicker waveform Data under each transmittance in the transmittance sequence is measured, finally the flicker waveform Data is analyzed to evaluate the effect intensity of the flicker waveform Data, compared with the traditional method for measuring the flexoelectric coefficient, the measuring difficulty is lower, the measuring result is more visual, and the effect of the flexoelectric effect on the display effect of the liquid crystal panel can be evaluated more accurately.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for evaluating the flexoelectric effect of a liquid crystal panel;
FIG. 2 is a simplified driving model schematic of a liquid crystal panel in an embodiment of the invention;
FIG. 3 is a schematic diagram of a driving waveform used for voltage-transmittance measurement of a liquid crystal panel according to an embodiment of the present invention;
FIG. 4 is a schematic diagram showing a voltage-transmittance curve of a liquid crystal panel according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of flicker waveforms of a liquid crystal panel according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a fast Fourier transform spectrum of a liquid crystal panel in an embodiment of the invention;
FIG. 7 is a graph showing the variation of the flicker intensity versus transmittance of the liquid crystal panel according to the embodiment of the present invention;
fig. 8 is a schematic structural diagram of a device for evaluating the flexoelectric effect of a liquid crystal panel according to the present invention;
fig. 9 is a schematic structural diagram of an electronic device provided by the present invention.
Reference numerals:
81: a light receiving unit; 82: a driving unit; 83: a measurement and control unit; 84: a data processing unit; 85: and a liquid crystal panel.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The liquid crystal panel flexoelectric effect evaluation method of the present invention is described below with reference to fig. 1 to 7.
As shown in fig. 1, the present invention provides a method for evaluating a liquid crystal panel flexoelectric effect, comprising:
s1, providing working voltage for the tested liquid crystal panel.
Specifically, in an alternative embodiment of the present invention, as shown in fig. 2, a corresponding working voltage is provided for the tested liquid crystal panel, and mainly a working state voltage of a Thin Film Transistor (TFT) of the liquid crystal panel is provided, including a thin film transistor on Voltage (VGH), a thin film transistor off Voltage (VGL), a Gate (Gate) signal voltage of the thin film transistor, an electrical reference ground voltage (GND) voltage, a liquid crystal panel liquid crystal layer reference voltage (Vcom), a thin film transistor source (Data) signal voltage, and the like, so that the liquid crystal panel can normally display different gray-scale images. Different designs of the TFTs of the liquid crystal panel, corresponding VGH and VGL voltages are different, usually VGH can take 15V, VGL can take-8V (different TFT designs, the optimal working voltage will be different), GND is the circuit reference voltage 0V, vcom is the reference voltage of the liquid crystal layer of the liquid crystal panel, and a suitable voltage for minimizing panel flicker can be usually taken, for example, 6.5V (the optimal Vcom voltages of different panels will be different).
S2, switching on a TFT of the liquid crystal panel to provide a driving signal required for measuring transmittance for a Data signal line of the liquid crystal panel.
Specifically, in an alternative embodiment provided in this embodiment, in this step, the Gate signal line VGH is supplied with a voltage to keep the liquid crystal panel TFT on. As shown in fig. 3, the Data signal line of the liquid crystal panel is provided with driving signals required for measuring transmittance, the driving signals are square wave driving signals with different magnitudes from low to high, the frequency of the driving signals is determined according to the working frequency of the liquid crystal panel design, the frequency of the driving signals is half of the working frequency of the liquid crystal panel design, for example, a common 60Hz panel, and the driving signals are 30Hz.
S3, acquiring screen brightness data of the liquid crystal panel, and drawing a voltage-to-transmittance curve of the liquid crystal panel according to the screen brightness data.
The transmittance of the liquid crystal panel is the ratio between the screen brightness of the liquid crystal panel and the backlight source. In this step, while a driving signal is supplied to Data, the screen brightness of the liquid crystal panel is acquired, and a voltage versus transmittance curve (VT curve) as shown in fig. 4 is plotted according to the screen brightness Data.
S4, selecting a transmittance sequence to be measured from the voltage-to-transmittance curve, and measuring corresponding flicker waveform data under each transmittance in the transmittance sequence.
In this step, a plurality of transmittance point values are selected from the voltage versus transmittance curve to be used as a transmittance sequence, then the TFT is turned on, a voltage signal required for measuring the transmittance is provided for the Data signal line, typically a positive and negative square wave signal referenced to the Vcom voltage, and corresponding flicker waveform Data under each transmittance in the transmittance sequence is measured. Preferably, when selecting the transmittance sequence to be measured, a plurality of relatively uniform transmittance point values can be selected to avoid too dense values in a certain interval, for example, the transmittance sequence can be selected as follows: 10%, 25%, 50%, 75%, 90%, 100%, then turning on the TFT to supply the Data signal lines with voltage signals required for corresponding transmittance measurement, and different liquid crystal panels, the driving voltages corresponding to the transmittance of which are different, and taking a certain liquid crystal panel as an example, the graph voltage versus transmittance curve is shown as 4, assuming that a voltage of 2.5V corresponding to 10% transmittance, a voltage of 3V corresponding to 25% transmittance, a voltage of 3.5V corresponding to 50% transmittance, a voltage of 4.5V corresponding to 75% transmittance, a voltage of 4.5V corresponding to 90% transmittance, and a voltage of 5V corresponding to 100% transmittance are respectively supplied, the respective flicker waveform Data corresponding to each transmittance are measured, and the graph of the measured flicker waveforms is shown as fig. 5, and the ordinate in fig. 5 represents the ratio of the current screen brightness of the liquid crystal panel to the screen brightness at the initial time (i.e., at 0 second).
S5, analyzing the flicker waveform data, and evaluating the strength of the flexoelectric effect.
In this step, specifically, it includes:
in an alternative embodiment provided by the present invention, the spectrum data corresponding to the flicker waveform may be obtained by using a fast fourier transform, and the transform result is shown in fig. 6. And recording the corresponding flicker intensity at a specific frequency in the frequency spectrum data. In an alternative embodiment provided by the invention, the specific frequency is twice the signal frequency of the driving signal, e.g. in case the frequency of the driving signal is 30Hz, the corresponding flicker intensity at the frequency position of 60Hz is recorded.
And drawing a change curve of the scintillation intensity at a specific frequency and the transmittance, and evaluating the strength of the flexoelectric effect by comparing the scintillation intensity of each measuring point of the change curve with the scintillation intensity near the specific transmittance. In an alternative embodiment provided by the invention, the flexoelectric effect evaluation is mainly performed near 100% and/or 90% transmittance, and the smaller the flicker intensity value near 100% and/or 90% transmittance, the lower the flexoelectric effect, and the other gray scale (i.e. at other transmittance) is a mixture of flexoelectric and other effects, which is usually used as reference evaluation. For example, in one embodiment of the present invention, 6 liquid crystal panels are selected and their corresponding variation curves of flicker intensity versus transmittance are measured, as shown in fig. 7, the panel MAT-OP-1284 has the minimum value of flicker intensity around the transmittance of 100% and 90%, and thus the panel MAT-OP-1284 has a lower flexoelectric effect. In fig. 7, the abscissa indicates the transmittance, and the ordinate indicates the scintillation intensity (in dB). Meanwhile, by comparing the flicker intensities at different transmittance positions on the graph, the difference of the influence degree of the flexoelectric effect on the display effect of the liquid crystal panel at different gray scales (namely under different transmittance) can be understood.
By implementing the method for evaluating the flexoelectric effect of the liquid crystal panel, the problems that a measuring system is complex, the measuring difficulty is high, and the influence of a simple liquid crystal flexoelectric coefficient on the display effect of the liquid crystal panel is difficult to intuitively evaluate in the traditional method for measuring the flexoelectric coefficient in the prior art can be solved, and the influence of the flexoelectric effect on the display effect of the liquid crystal panel is evaluated by utilizing a scintillation measuring method.
Based on the same inventive concept, the invention further provides a liquid crystal panel flexoelectric effect evaluation device, the liquid crystal panel flexoelectric effect evaluation device provided by the invention is described below, and the liquid crystal panel flexoelectric effect evaluation device described below and the liquid crystal panel flexoelectric effect evaluation method described above can be correspondingly referred to each other.
As shown in fig. 8, the present invention provides a liquid crystal panel 85 flexoelectric effect evaluation device including a light receiving unit 81, a driving unit 82, a measurement and control unit 83, and a data processing unit 84.
In an alternative embodiment provided in the present application, the liquid crystal panel 85 is a complete liquid crystal panel to be tested, a simplified driving model schematic diagram of the liquid crystal panel 85 is shown in fig. 2, the liquid crystal panel 85 needs to be pre-processed, and Vcom, data, gate points of the liquid crystal panel 85 are led out and connected with a testing cable, so that the liquid crystal panel is conveniently connected with the measurement and control unit 83 to perform measurement.
Wherein the light receiving unit 81 is used to measure luminance data of a screen of the liquid crystal panel 85. During the measurement process, it is necessary to provide a stable and reliable backlight to provide a light source for the panel. After the light source passes through the liquid crystal panel 85, the light receiving unit 81 is used to measure the screen brightness of the liquid crystal panel 85 on the front surface, the sampling rate of the brightness value sampling by the measurement and control unit is more than 10 thousand times per second (kSPS), and the sampling rate of more than 100 thousand times per second is recommended to achieve better measurement effect.
The driving unit 82 is configured to provide a working voltage for the tested liquid crystal panel 85, turn on a switch of a TFT of the liquid crystal panel 85, and provide a driving signal required for measuring transmittance for a Data signal line of the liquid crystal panel 85. Specifically, the driving unit 82 supplies the TFT operating state voltage (including VGH, VGL voltage) of the liquid crystal panel 85, gate signal voltage, GND voltage, and the liquid crystal panel 85Vcom voltage, data signal voltage, where VGH is the TFT on-demand voltage and VGL is the TFT off-demand voltage. The Gate signal line applies VGH voltage when it is required to supply a driving signal to the liquid crystal layer of the liquid crystal panel 85 through the Data signal line, i.e., turns on the TFT operation, and applies VGL voltage when it is required to disconnect Data from the liquid crystal layer. GND is the circuit reference voltage, vcom is the liquid crystal layer reference voltage. The Data signal line is loaded with a display signal voltage to be written into the liquid crystal layer, and is usually a positive and negative square wave signal corresponding to Vcom in order to prevent polarization of the liquid crystal.
The measurement and control unit 83 is configured to obtain the luminance data, and send the luminance data to the data processing unit 84. In an alternative embodiment provided by the present invention, in an alternative embodiment provided by the present application, the measurement and control unit 83 comprises a measurement subunit and a control subunit. The measurement subunit is configured to condition and convert the brightness signal collected by the light receiving unit 81 into a digital signal, and send the digital signal to the data processing unit 84 for processing in a suitable communication mode. The control subunit is configured to control the operation of the driving unit 82. In an alternative embodiment of the present invention, the measurement and control unit 83 may further include a wireless communication module (cellular, bluetooth, WLAN, etc.), and send information to the data processing unit 84 by means of wireless transmission; alternatively, the measurement and control unit 83 may further include a wired communication module, and send information to the data processing unit 84 through a signal line (USB, internet access, etc.) connection.
The data processing unit 84 is configured to perform the above-described method for evaluating the flexoelectric effect of the liquid crystal panel 85, and includes:
acquiring screen brightness data of the liquid crystal panel 85, and drawing a voltage-to-transmittance curve of the liquid crystal panel according to the screen brightness data;
selecting a transmittance sequence to be measured from the voltage-to-transmittance curve, and measuring corresponding flicker waveform data under each transmittance in the transmittance sequence;
and analyzing the flicker waveform data to evaluate the strength of the flexoelectric effect.
In an alternative embodiment of the present application, other instrument and device combinations may be used to provide the required signal and brightness data acquisition functions, such as using PMTs or photodiodes for light brightness acquisition, multiple programmable power supplies and arbitrary waveform generators for TFT and liquid crystal panel signals and voltages, oscilloscopes with data output for data acquisition and export, and computers for data processing.
Fig. 9 illustrates a physical schematic diagram of an electronic device, as shown in fig. 9, which may include: processor 910, communication interface (Communications Interface), memory 930, and communication bus 940, wherein processor 910, communication interface 920, and memory 930 communicate with each other via communication bus 940. The processor 910 may invoke logic instructions in the memory 930 to perform a liquid crystal panel flexoelectric effect evaluation method comprising:
providing working voltage for the tested liquid crystal panel;
opening a switch of a TFT of the liquid crystal panel, and providing a driving signal required for measuring transmittance for a Data signal line of the liquid crystal panel;
acquiring screen brightness data of the liquid crystal panel, and drawing a voltage-to-transmittance curve of the liquid crystal panel according to the screen brightness data;
selecting a transmittance sequence to be measured from the voltage-to-transmittance curve, and measuring corresponding flicker waveform data under each transmittance in the transmittance sequence;
and analyzing the flicker waveform data to evaluate the strength of the flexoelectric effect.
Further, the logic instructions in the memory 930 described above may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product, where the computer program product includes a computer program, where the computer program can be stored on a non-transitory computer readable storage medium, and when the computer program is executed by a processor, the computer can execute the method for evaluating the flexoelectric effect of the liquid crystal panel provided by the above methods, and the method includes:
providing working voltage for the tested liquid crystal panel;
opening a switch of a TFT of the liquid crystal panel, and providing a driving signal required for measuring transmittance for a Data signal line of the liquid crystal panel;
acquiring screen brightness data of the liquid crystal panel, and drawing a voltage-to-transmittance curve of the liquid crystal panel according to the screen brightness data;
selecting a transmittance sequence to be measured from the voltage-to-transmittance curve, and measuring corresponding flicker waveform data under each transmittance in the transmittance sequence;
and analyzing the flicker waveform data to evaluate the strength of the flexoelectric effect.
In still another aspect, the present invention also provides a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform the liquid crystal panel flexoelectric effect evaluation method provided by the above methods, the method comprising:
providing working voltage for the tested liquid crystal panel;
opening a switch of a TFT of the liquid crystal panel, and providing a driving signal required for measuring transmittance for a Data signal line of the liquid crystal panel;
acquiring screen brightness data of the liquid crystal panel, and drawing a voltage-to-transmittance curve of the liquid crystal panel according to the screen brightness data;
selecting a transmittance sequence to be measured from the voltage-to-transmittance curve, and measuring corresponding flicker waveform data under each transmittance in the transmittance sequence;
and analyzing the flicker waveform data to evaluate the strength of the flexoelectric effect.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are preferred embodiments for the principles of the present invention, and the principles of the present invention are not limited to the above embodiments. In addition to the above-mentioned embodiments, those skilled in the art may perform equivalent data or equivalent process changes (for example, gray scale is used to replace transmittance, flicker degree is used to replace spectrum flicker intensity, etc.) in the present specification and the accompanying drawings, or apply directly or indirectly to other technical fields, which are all included in the scope of the present invention.
Claims (10)
1. A method for evaluating a flexoelectric effect of a liquid crystal panel is characterized by comprising the following steps:
providing working voltage for the tested liquid crystal panel;
opening a switch of a TFT of the liquid crystal panel, and providing a driving signal required for measuring transmittance for a Data signal line of the liquid crystal panel;
acquiring screen brightness data of the liquid crystal panel, and drawing a voltage-to-transmittance curve of the liquid crystal panel according to the screen brightness data;
selecting a transmittance sequence to be measured from the voltage-to-transmittance curve, and measuring corresponding flicker waveform data under each transmittance in the transmittance sequence;
and analyzing the flicker waveform data to evaluate the strength of the flexoelectric effect.
2. The method for evaluating the flexoelectric effect of a liquid crystal panel according to claim 1, wherein the flicker waveform data is analyzed to evaluate the magnitude of the flexoelectric effect, and specifically comprises:
acquiring frequency spectrum data corresponding to the flicker waveform data, and recording the corresponding flicker intensity at a specific frequency in the frequency spectrum data;
and drawing a change curve of the flicker intensity at the specific frequency and the transmittance, and evaluating the strength of the flexoelectric effect by comparing the flicker intensity of each measuring point of the change curve with the flicker intensity near the specific transmittance.
3. The method according to claim 2, wherein the specific frequency is twice the signal frequency of the driving signal.
4. The method of claim 1, wherein the driving signals are square wave driving signals of different magnitudes from low to high.
5. The method according to claim 4, wherein the frequency of the driving signal is half of the design operating frequency of the liquid crystal panel.
6. The method for evaluating the flexoelectric effect of a liquid crystal panel according to claim 1, wherein obtaining the spectrum data corresponding to the flicker waveform data, specifically comprises:
and acquiring the frequency spectrum data corresponding to the flicker waveform by using fast Fourier transform.
7. A liquid crystal panel flexoelectric effect evaluation device for performing the liquid crystal panel flexoelectric effect evaluation method according to any one of claims 1 to 6, comprising: the device comprises a light receiving unit, a driving unit, a measurement and control unit and a data processing unit;
the light receiving unit is used for measuring brightness data of a screen of the liquid crystal panel;
the driving unit is used for providing working voltage for the tested liquid crystal panel, opening a switch of a TFT of the liquid crystal panel and providing driving signals required by measuring transmittance for a Data signal line of the liquid crystal panel;
the measurement and control unit is used for acquiring the brightness data and sending the brightness data to the data processing unit;
the data processing unit is used for acquiring screen brightness data of the liquid crystal panel, drawing a voltage versus transmittance curve of the liquid crystal panel according to the screen brightness data, selecting a transmittance sequence to be measured from the voltage versus transmittance curve, measuring corresponding flicker waveform data under each transmittance in the transmittance sequence, analyzing the flicker waveform data, and evaluating the strength of the flexoelectric effect of the flicker waveform data.
8. The device for evaluating the flexoelectric effect of a liquid crystal panel according to claim 7, wherein the sampling rate of the measurement and control unit is more than 10 thousand times per second.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the liquid crystal panel flexoelectric effect evaluation method according to any one of claims 1 to 6 when executing the program.
10. A non-transitory computer-readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the liquid crystal panel flexoelectric effect evaluation method according to any one of claims 1 to 6.
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