CN102213848A - Method and system for measuring transmissivity of liquid crystal display panel - Google Patents
Method and system for measuring transmissivity of liquid crystal display panel Download PDFInfo
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- CN102213848A CN102213848A CN2010101455434A CN201010145543A CN102213848A CN 102213848 A CN102213848 A CN 102213848A CN 2010101455434 A CN2010101455434 A CN 2010101455434A CN 201010145543 A CN201010145543 A CN 201010145543A CN 102213848 A CN102213848 A CN 102213848A
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Abstract
The invention discloses a method and system for measuring the transmissivity of a liquid crystal display panel, relating to the technical field of liquid crystal display and improving the precision of measuring the transmissivity curve of the liquid crystal display panel. The method comprises the following steps of: acquiring an initial voltage of the liquid crystal display panel; respectively inputting the initial voltage and a symmetrical voltage as a display voltage to the liquid crystal display panel, wherein the symmetrical voltage takes the initial voltage as a center; and respectively acquiring the brightness value of the liquid crystal display panel under the display voltage, wherein the brightness value is used for obtaining the corresponding transmissivity. The embodiment of the invention is mainly applied to a process of measuring the transmissivity of the liquid crystal display panel.
Description
Technical field
The present invention relates to technical field of liquid crystal display, relate in particular to a kind of measuring method and system of liquid crystal panel transmitance.
Background technology
On LCD product, during the show image figure,, can control the angle of liquid crystal rotation, and then the amount of penetrating that changes light obtains different GTGs by on liquid crystal, applying different voltage.As, the liquid crystal panel of normal white mode, when not applying voltage on liquid crystal, rod shaped liquid crystal can be arranged to be similar to the attitude that lies low, and polaroid was maximum about light passed at this moment, and liquid crystal panel presents bright attitude; When being applied to certain voltage making the liquid crystal standing upright on liquid crystal, light almost can not pass through, and this moment, liquid crystal panel was rendered as dark attitude.And in the middle of needs show each, during GTG, only need on liquid crystal, to apply corresponding voltage and get final product.
In the process of liquid crystal applied voltages, if the voltage that is applied immobilizes, the characteristic of liquid crystal molecule can be damaged above-mentioned, even with the voltage cancellation, liquid crystal also can't rotate with the variation of electric field again, thereby also can't present different GTGs.Thereby the display voltage of liquid crystal panel has positive-negative polarity, thereby changes the voltage that is applied on the liquid crystal.As, when the display voltage of liquid crystal panel was higher than public electrode voltages, display voltage was a positive polarity; Otherwise when the display voltage of liquid crystal panel was lower than public electrode voltages, display voltage was a negative polarity.No matter display voltage is positive polarity or negative polarity, when the pressure reduction absolute value of described display voltage and public electrode voltages was identical, the GTG that is presented also was the same.
From the procedure for displaying of above-mentioned liquid crystal panel as can be seen, show that GTG is relevant with the transmitance of light.Thereby, by measuring the transmittance curve of liquid crystal panel, can carry out liquid crystal panel and carry out the voltage setting, thereby control the demonstration of each GTG, draw the image figure of the sense organ that meets the people.
When measuring transmitance, prior art adopts manual adjustments to load the forward dc electricity, manually reads the method for brightness number, by apply the transmitance of coming the test fluid crystal panel from 0V to the DC voltage of liquid crystal generation maximum deflection on liquid crystal cell.Yet, the inventor finds that the shortcoming of this method is can produce dc offset voltage owing to apply this asymmetrical voltage in the measuring process, make liquid crystal molecule assemble, produce parasitic fields, influence the deflection of liquid crystal under normal electric field, thereby make that the transmittance curve error measure is bigger, the test poor repeatability, and also can introduce personal error when manually reading brightness.
Summary of the invention
Embodiments of the invention provide a kind of measuring method and system of liquid crystal panel transmitance, have improved the precision of measuring the transmittance curve of liquid crystal panel.
For achieving the above object, embodiments of the invention adopt following technical scheme:
A kind of measuring method of liquid crystal panel transmitance comprises:
Obtain the initial voltage of liquid crystal panel;
Import described initial voltage respectively, be that the symmetrical voltage at center is as display voltage to liquid crystal panel with described initial voltage;
Obtain the brightness value of described liquid crystal panel under described display voltage respectively, described brightness value is used to draw corresponding transmitance.
A kind of measuring system of liquid crystal panel transmitance comprises:
The voltage output module is used for the size and the time interval of setting voltage output, imports described initial voltage respectively, is that the symmetrical voltage at center is as display voltage with described initial voltage to liquid crystal panel;
Data acquisition module is used for obtaining respectively the brightness value of described liquid crystal panel under described display voltage, and described brightness value is used to draw corresponding transmitance.
By the described embodiment of the invention of technique scheme, at first obtain the initial voltage of liquid crystal panel, import described initial voltage and be the symmetrical voltage at center to liquid crystal panel then with described initial voltage, and obtain the brightness value of described liquid crystal panel under described display voltage respectively, described brightness value is used to draw corresponding transmitance, and then can draw out the transmitance of this liquid crystal panel.
Because what import in the technical program is to be the symmetrical voltage at center with described initial voltage, this mode can reduce in the liquid crystal panel box effectively owing to introduce the ion aggregation that bias voltage causes during the input asymmetrical voltage, make liquid crystal under the electric field environment that normal input voltage is produced, to deflect, and then can draw correct transmitance.And prior art adopts the galvanic mode that directly loads single direction, introduces residual bias voltage easily in measuring process, thereby causes voltage-transmittance curve error bigger.Compared with prior art, the embodiment of the invention has improved the precision of measuring voltage-transmittance curve.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the process flow diagram of the measuring method of liquid crystal panel transmitance among the embodiment 1;
Fig. 2 is the structural drawing of the measuring system of liquid crystal panel transmitance among the embodiment 1;
Fig. 3 is the process flow diagram of the measuring method of liquid crystal panel transmitance among the embodiment 2;
Fig. 4 is the synoptic diagram of the voltage input mode among the embodiment 2;
Fig. 5 is the synoptic diagram of voltage input mode of the prior art;
Fig. 6 is the synoptic diagram of the transmittance curve that adopts prior art and draw;
The synoptic diagram of the transmittance curve that Fig. 7 draws for the method that adopts among the embodiment 2;
Fig. 8 is the synoptic diagram of the transmittance curve among the embodiment 2;
The synoptic diagram that Fig. 9 draws for the transmittance curve of revising among Fig. 8;
Figure 10 is the structural drawing of the measuring system of liquid crystal panel transmitance among the embodiment 2.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Embodiment 1:
The embodiment of the invention provides a kind of measuring method of liquid crystal panel transmitance, and as shown in Figure 1, this method comprises the steps:
101, obtain the voltage initially apply.In the design phase of liquid crystal panel, parameter such as the public electrode voltages by liquid crystal panel, output voltage can calculate the described voltage that initially applies.
102, import described initial voltage respectively, be that the symmetrical voltage at center is as display voltage to liquid crystal panel with described initial voltage.
What can control described input exactly by the correspondent voltage Output Control Program is the magnitude of voltage of the symmetrical voltage at center with described initial voltage, the time interval of input etc., adopt this symmetric mode to carry out in voltage input can the minimizing effectively liquid crystal panel box because the ion aggregation that residual bias voltage causes, make liquid crystal under the electric field environment that normal input voltage is produced, to deflect, reduce because the measuring error that residual bias voltage produces.
103, obtain the brightness value of described liquid crystal panel under described display voltage respectively, described brightness value is used to draw corresponding transmitance.The angle that liquid crystal deflects under different voltage not can, and then light pass liquid crystal panel what are also different.Thereby liquid crystal panel can present different brightness values under different input voltages.This brightness value reflects the transmitance of liquid crystal panel under the voltage of correspondence.By obtaining the brightness value of described liquid crystal panel under described display voltage respectively, just can draw the transmitance of this liquid crystal panel.
From the implementation procedure of said method as can be seen, adopting input is the mode of the symmetrical voltage at center with described initial voltage, can reduce the bias voltage of introducing when the inherent input voltage of liquid crystal panel box is measured, and then the error of minimizing measurement, with cause measuring error to be compared more greatly owing to adopt loading the galvanic mode of single direction in the prior art, the embodiment of the invention has improved the precision of measuring transmittance curve.
Correspondingly, in order to realize said method, the embodiment of the invention also provides a kind of measuring system of liquid crystal panel transmitance, and as shown in Figure 2, this system comprises: voltage output module 21 and data acquisition module 22.
Wherein, voltage output module 21 is used for importing described initial voltage respectively, being that the symmetrical voltage at center is as display voltage with described initial voltage to liquid crystal panel.Described initial voltage can obtain by analog computation in the design phase of liquid crystal panel.This voltage output device can definitely be controlled the size and the time interval of described input voltage.With compare by manual loading forward dc electricity in the prior art, can reduce personal error.Simultaneously, data acquisition module 22 is used to read the brightness value of described liquid crystal panel under described input voltage, and described brightness value is used to draw corresponding transmitance.Draw under described input voltage and after each self-corresponding transmitance, just can draw the voltage-transmittance curve of this liquid crystal panel.
Is the symmetrical voltage at center by input with described initial voltage by above-mentioned measuring system, can reduce in the liquid crystal panel box owing to introduce the ion aggregation that bias voltage causes during input voltage, make liquid crystal under the electric field environment that normal input voltage is produced, to deflect, and then can draw correct transmittance curve.And prior art adopts manual the input to be easy to generate bias voltage when the forward dc electricity is measured, and then causes measuring error, compared with prior art, has improved the precision of measuring transmittance curve.
Embodiment 2:
In the specific implementation process, owing to apply under the situation of asymmetrical voltage signal in technological process or at other, make liquid crystal cell inside also might produce residual bias voltage, even imported symmetrical electric field this moment, because the existence of residual bias voltage still can influence the deflection of liquid crystal, thereby also have influence on voltage-transmittance curve symmetry, in order to improve the precision of the transmittance curve of measuring liquid crystal panel better, the embodiment of the invention provides a kind of measuring method of liquid crystal panel transmitance, as shown in Figure 3, this method comprises the steps:
301, obtain initial voltage.
When the voltage on the liquid crystal panel changes usually, can produce mutation voltage, this mutation voltage can have influence on the correctness of show electrode voltage on the liquid crystal panel.And for the liquid crystal panel of FFS pattern, it is approximate identical that the mutation voltage under each GTG can be thought.Under the perfect condition, the value of described mutation voltage is zero, but generally, the value of described mutation voltage is all non-vanishing.Thereby in order to reduce the measuring error that mutation voltage causes, in the embodiment of the invention, the initial voltage of liquid crystal panel is set to public electrode voltages and said mutation voltage sum.
Said mutation voltage can calculate by following formula:
Low-voltage when wherein, the high voltage when Δ Vg=Vgh-Vg1, Vgh represent that gate electrode is opened, Vg1 represent that gate electrode is closed; Cgs represents stray capacitance, and Cst represents storage capacitors, and Clc represents liquid crystal capacitance.Can obtain Cgs under each voltage by Computerized three-dimensional simulation in the specific implementation process, Cst, the value of Clc and Δ Vg, thus can obtain the value of mutation voltage Δ Vp by above-mentioned formula.
302, draw initial voltage after, just can at interval import described initial voltage and be the symmetrical voltage at center to described liquid crystal panel successively according to Preset Time with described initial voltage.
As, the public electrode voltages of liquid crystal panel is 5v, when the mutation voltage that calculates was 1v, described initial voltage was 6v.In specific implementation process, above-mentioned Preset Time can be set and change at interval by the correspondent voltage written-out program, can be set to 1s as the time interval.And above-mentioned successively the input symmetrical voltage in adjacent each all be the center to voltage with the initial voltage, and with initial voltage between have identical voltage difference, described voltage difference increases progressively successively.Such as just import a voltage every 1s, Shu Ru voltage is 6v successively, 6.1v, 5.9v, 6.2v, 5.8v, 6.3v, 5.7v ..., from the contact potential series of this input as can be seen, adjacent each is to voltage, as 6.1v and 5.9v, 6.2v and 5.8v, 6.3v and 5.7v are to be the symmetrical voltage at center with the initial voltage, simultaneously, above-mentioned each have identical voltage difference between voltage and the initial voltage, be 0.1 as the voltage difference between 6.1v and 5.9v and the initial voltage (6v), the voltage difference between 6.2v and 5.8v and the initial voltage (6v) is 0.2, by that analogy, this voltage difference also increases progressively successively.
Be illustrated in figure 4 as the synoptic diagram of above-mentioned employing symmetrical voltage input mode, wherein Center represents initial voltage.And prior art is to adopt the mode that loads the forward dc electricity, and as shown in Figure 5, this mode outputs to the voltage of liquid crystal generation maximum deflection always from 0v.This step by applying symmetrical voltage and having reduced in the prior art owing to introduce the measuring error that bias voltage causes during input forward dc electricity.
303, in above-mentioned input symmetrical voltage, in described input voltage time corresponding interval, read the brightness value of default number from described liquid crystal panel.In specific implementation process, the luminance test instrument can be connected with liquid crystal panel, data acquisition module is connected with above-mentioned luminance test instrument, and the frequency of described image data can be provided with by data acquisition module, gathers brightness value then automatically.As, in above-mentioned input voltage 1s interval time, gather 10 brightness values.
Then, the brightness value of the described default number that reads out averaged calculate average brightness value, described average brightness value is described liquid crystal panel corresponding brightness value under described input voltage.As, above-mentioned 10 brightness values that collect are averaged draw average brightness value.
This step realizes by manually reading brightness value in the prior art, reads a brightness value under each input voltage.But because the brightness irregularities of backlight, and exist over time, if the situation that brightness backlight also changes with the method for existing manual record, can not be judged the accuracy of institute's test brightness.And pass through in the present embodiment in the time that described input voltage keeps, also be to read a plurality of brightness values in the Preset Time interval, and a plurality of brightness values that will read average calculating automatically.With the brightness value of average brightness value, improved the precision of measuring transmittance curve then as correspondence under the current input voltage.Described each brightness value all has corresponding transmitance, as with brightness value when maximum the transmitance of correspondence be 100%, other brightness value can be according to drawing corresponding transmitance with the ratio calculation of described maximum brightness value.
Be the transmittance curve that draws respectively after adopting prior art to measure through 5 times as shown in Figure 6, wherein the voltage on the transverse axis is the voltage of actual input.Be the transmittance curve through drawing after 5 measurements in the embodiment of the invention among Fig. 7.Wherein the voltage on the transverse axis is the voltage of actual input.From measurement result as can be seen, the transmittance curve that the embodiment of the invention draws respectively after measuring through 5 times is symmetry and repeatability preferably specifically, and the precision of measurement result is also higher.
Mode by above-mentioned input symmetrical voltage can improve the precision of measuring transmittance curve, yet, apply under the situation of asymmetrical voltage signal in technological process or at other, make liquid crystal cell inside also might produce residual bias voltage, even imported symmetrical electric field this moment, because the residual bias voltage that has existed in the liquid crystal cell can influence the deflection of liquid crystal, thereby also has influence on voltage-transmittance curve symmetry.Following step can be revised the above-mentioned transmitance that draws, and can improve the precision of transmittance curve further.
304, suppose that in the one-shot measurement process transmittance curve that draws by above-mentioned steps is wherein transmittance curve shown in Figure 7.Be that central shaft carries out symmetrical treatment with described transmittance curve now with the initial voltage, draw the another kind of synoptic diagram of this transmittance curve.As shown in Figure 8, wherein positive field is the electric field that the voltage in input produces during greater than described initial voltage, and described negative sense electric field is the electric field that voltage in input produces during less than described initial voltage.The voltage of representing on the transverse axis is the voltage of actual input and the absolute value of initial voltage difference.
From above-mentioned the input successively with described initial voltage is that the process of the symmetrical voltage at center can be learnt, every two adjacent voltages are one group, two voltages of same group are identical with the absolute value of the difference of described initial voltage, as, 6.1v and 5.9v, 6.2v and 5.8v, 6.3v and 5.7v are respectively three groups of symmetrical voltages, two voltage on the same group is identical with the absolute value of the difference of initial voltage.Input voltage greater than described initial voltage in two described same group voltages is a positive voltage, is negative voltage less than the input voltage of described initial voltage.Above-mentioned positive field just produces under positive voltage, and the negative sense electric field produces under negative voltage.Among above-mentioned Fig. 8 the same magnitude of voltage of horizontal ordinate respectively to should have one under the positive voltage transmitance and the transmitance under negative voltage.
In theory, in liquid crystal cell, do not have under the situation of bias voltage existence, when the voltage of actual input is identical with the absolute value of initial voltage difference, just positive field should overlap with the pairing separately transmittance curve of negative sense electric field under the same magnitude of voltage of above-mentioned Fig. 8, as, input 6.1v and 5.9v, the transmitance that draws in theory should be identical.Yet in fact, in the production run of liquid crystal panel, unavoidably can there be some residual bias voltages, from above-mentioned Fig. 8 as can be seen, such as when transverse axis voltage is 3v, the curve of positive field correspondence is on the curve of negative sense electric field correspondence at this moment, just Shu Ru positive voltage is 9v, and the transmitance that negative voltage is drawn when being 3v is different.
This moment is in order to reduce measuring error, the difference of the transmitance that draws under transmitance that draws under need at first more above-mentioned positive field and the negative sense electric field, carry out the operation of balanced voltage then according to the difference of residual bias voltage, specifically can realize by following step:
305, in two voltages identical with the absolute value of described initial voltage difference, when the transmitance of positive voltage correspondence transmitance greater than the negative voltage correspondence, and the difference of described two transmitances is during greater than predetermined threshold value, apply the negative sense bias voltage to described liquid crystal panel, described negative sense bias voltage makes the difference of described two transmitances be not more than predetermined threshold value.
As, horizontal ordinate is 3 o'clock in above-mentioned 8 figure, just the absolute value with described initial voltage difference is 3 o'clock, as can be seen from Figure 8, this moment is when the transmitance of the positive voltage correspondence transmitance greater than the negative voltage correspondence, suppose this moment both differences greater than predetermined threshold, shows that at this moment residual bias voltage is a forward bias voltage in liquid crystal panel, need apply the negative sense bias voltage carry out balance this moment, makes the difference of two transmitances less than in the predetermined threshold value.
In the specific implementation process, described negative sense bias voltage can be the negative voltage that before applies 3v in time interval 1s, can not change the size of the negative voltage that applies this moment, change the time that applies voltage into 2s, perhaps also can take application time constant, still be 1s, increase the mode of negative voltage.Returning 303 steps then adopts identical method to obtain brightness value under described negative sense bias voltage.At first read the brightness value of default number from described liquid crystal panel, if before be to read 10 brightness datas, also will correspondingly read 10 brightness datas this moment.At last the brightness value of the described default number that reads out is averaged and calculate average brightness value, then relatively this moment the transmitance that draws with the difference of the transmitance that under above-mentioned negative voltage, draws whether smaller or equal to predetermined threshold value, if smaller or equal to described predetermined threshold value, then the transmitance of described positive voltage correspondence is modified to the transmitance of described average brightness value correspondence.If greater than described predetermined threshold value, then repeat and apply the negative sense bias voltage, up to finding out suitable negative sense bias voltage, make the difference of the transmitance that the transmitance of positive voltage correspondence is corresponding with negative voltage be not more than predetermined threshold.Consider in the actual application that the transmitance of the above-mentioned positive voltage correspondence transmitance corresponding with negative voltage can not be equal fully, thereby as long as above-mentioned both difference is just to think that both have been approximately equals being not more than predetermined threshold value.
306, same, when the transmitance of positive voltage correspondence transmitance less than the negative voltage correspondence, and the difference of described two transmitances applies forward bias voltage to described liquid crystal panel during greater than predetermined threshold value, and described forward bias voltage makes the difference of described two transmitances be not more than predetermined threshold value.
Simultaneously, in the application time of described forward bias voltage, the method in 303 of taking steps reads the brightness value of default number from described liquid crystal panel, the brightness value of the described default number that reads out averaged calculate average brightness value, the transmitance of described negative voltage correspondence is modified to the transmitance of described average brightness value correspondence.The described method that applies forward bias voltage is identical with the above-mentioned method that applies the negative sense bias voltage.
The transmittance curve that draws after the data correction of transmittance curve among above-mentioned Fig. 8 by this step is shown in Figure 9, and as can be seen from Figure 9, the transmittance curve that this method obtains has symmetry preferably, thereby has also improved the precision of measuring.
Correspondingly, in order to realize said method, the embodiment of the invention also provides a kind of measuring system of liquid crystal panel transmittance curve, as shown in figure 10, this system comprises: PC main frame 41, nitometer 42, adjustable power of direct current 43, data acquisition module 44, voltage output module 45 and data correction module 46.
Wherein, PC main frame 41 by programming controller 50 respectively with voltage output module 45, data acquisition module 44 is connected with data correction module 46, voltage output module 45 is input to voltage on the liquid crystal panel by 43 controls of main flow regulated power supply.Data acquisition module 44 is connected with nitometer 42 respectively with data correction module 46, and nitometer 42 is connected with the liquid crystal panel of being tested 51.Carry out the work that brightness is gathered by PC main frame 41 these nitometers 42 of control.
Described voltage output module 45 is used for importing described initial voltage respectively, being that the symmetrical voltage at center is as display voltage with described initial voltage to liquid crystal panel 51; It is the symmetrical voltage at center to the described liquid crystal panel 51 described initial voltages of input with described initial voltage at interval successively that described voltage output module is used for according to Preset Time.
In the time of the input of voltage output module control voltage, data acquisition module 44 is used to read the brightness value of described liquid crystal panel under described input voltage, and described brightness value is used to draw corresponding transmitance.Described data acquisition module can be carried out the function segmentation in the specific implementation process, (figure does not show), this data acquisition module comprised: reading unit and computing unit.
Wherein, reading unit is used for reading the brightness value of default number from described liquid crystal panel in described each display voltage time corresponding interval.Computing unit is used for brightness value with the described default number that reads out and averages and calculate average brightness value, and described average brightness value is described liquid crystal panel corresponding brightness value under described display voltage.
In actual applications, consider in the production run of liquid crystal panel or at other and apply under the situation of asymmetrical voltage signal, make liquid crystal cell inside also might produce residual bias voltage, even imported symmetrical electric field this moment, because the existence of residual bias voltage still can influence the deflection of liquid crystal, thereby also has influence on voltage-transmittance curve symmetry.
In order better to improve the precision of transmittance curve, described data correction module 46 can adopt the first data correction module, perhaps adopts the second data correction module to realize the residual bias voltage of balance.
In two voltages identical with the absolute value of described initial voltage difference, when the transmitance of positive voltage correspondence transmitance greater than the negative voltage correspondence, and the difference of described two transmitances is during greater than predetermined threshold value, the described first data correction module can make the difference of described two transmitances be not more than predetermined threshold value by applying the negative sense bias voltage to described liquid crystal panel.Then, described data acquisition module also is used in the application time of described negative sense bias voltage, read the brightness value of default number from described liquid crystal panel, the brightness value of the described default number that reads out averaged calculate average brightness value, the transmitance of described positive voltage correspondence is modified to the transmitance of described average brightness value correspondence.
Perhaps, the described first data correction module can also make the difference of described two transmitances be not more than predetermined threshold value by increasing the application time of described negative voltage.As, the initial application time of described negative voltage is 1s, can be adjusted into 2s this moment.In the application time of described negative voltage, described data acquisition module also is used for reading from described liquid crystal panel the brightness value of default number, the brightness value of the described default number that reads out averaged calculate average brightness value, the transmitance of described positive voltage correspondence is modified to the transmitance of described average brightness value correspondence.
Equally, in the transmitance of above-mentioned positive voltage correspondence transmitance less than the negative voltage correspondence, and the difference of described two transmitances is during greater than predetermined threshold value, the described second data correction module can make the difference of described two transmitances be not more than predetermined threshold value by applying forward bias voltage to described liquid crystal panel.Then, described data acquisition module also is used in the application time of described forward bias voltage, read the brightness value of default number from described liquid crystal panel, the brightness value of the described default number that reads out averaged calculate average brightness value, the transmitance of described negative voltage correspondence is modified to the transmitance of described average brightness value correspondence.
Perhaps, the above-mentioned second data correction module also can make the difference of described two transmitances be not more than predetermined threshold value by increasing the application time of described positive voltage.In the application time of described positive voltage, described data acquisition module also is used for reading from described liquid crystal panel the brightness value of default number, the brightness value of the described default number that reads out averaged calculate average brightness value, the transmitance of described negative voltage correspondence is modified to the transmitance of described average brightness value correspondence.
Better by the transmittance curve repeatability that transmittance curve correction is drawn, improve the symmetry of transmittance curve, thereby improved precision and the repeatability of measuring transmittance curve.
The embodiment of the invention is mainly used in the liquid crystal technology field, is particularly suitable for measuring the process of liquid crystal panel transmitance.By applying with described initial voltage is the symmetrical voltage at center, and carries out correcting process at asymmetric transmittance curve, has improved the precision of measuring transmittance curve greatly.
Through the above description of the embodiments, the those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential common hardware, can certainly pass through hardware, but the former is better embodiment under a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium that can read, floppy disk as computing machine, hard disk or CD etc., comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (11)
1. the measuring method of a liquid crystal panel transmitance is characterized in that, comprising:
Obtain the initial voltage of liquid crystal panel;
Import described initial voltage respectively, be that the symmetrical voltage at center is as display voltage to liquid crystal panel with described initial voltage;
Obtain the brightness value of described liquid crystal panel under described display voltage respectively, described brightness value is used to draw corresponding transmitance.
2. the measuring method of liquid crystal panel transmitance according to claim 1 is characterized in that, described initial voltage is the public electrode voltages and the known mutations voltage sum of described liquid crystal panel.
3. the measuring method of liquid crystal panel transmitance according to claim 1 is characterized in that, describedly imports described initial voltage respectively, is that the symmetrical voltage at center is with described initial voltage as display voltage to liquid crystal panel:
At interval import described initial voltage and be the symmetrical voltage at center to described liquid crystal panel successively according to Preset Time with described initial voltage,
Described successively the input symmetrical voltage in adjacent each all be the center to voltage with the initial voltage, and with initial voltage between have identical voltage difference, described voltage difference increases progressively successively.
4. the measuring method of liquid crystal panel transmitance according to claim 1 is characterized in that, obtains the brightness value of described liquid crystal panel under described display voltage respectively and comprises:
In described each display voltage time corresponding interval, read the brightness value of default number from described liquid crystal panel;
The brightness value of the described default number that reads out averaged calculate average brightness value, described average brightness value is described liquid crystal panel corresponding brightness value under described display voltage.
5. the measuring method of liquid crystal panel transmitance according to claim 1, it is characterized in that, is in the symmetrical voltage at center what import successively with described initial voltage, every two adjacent voltages are one group, two voltages of same group are identical with the absolute value of the difference of described initial voltage, input voltage greater than described initial voltage in two described same group voltages is a positive voltage, is negative voltage less than the input voltage of described initial voltage, and this method also comprises:
In same group of two voltages, when the transmitance of positive voltage correspondence transmitance greater than the negative voltage correspondence, and the difference of described two transmitances is during greater than predetermined threshold value, apply the negative sense bias voltage to described liquid crystal panel, described negative sense bias voltage makes the difference of described two transmitances be not more than predetermined threshold value; In the application time of described negative sense bias voltage, read the brightness value of default number from described liquid crystal panel, the brightness value of the described default number that reads out averaged calculate average brightness value, the transmitance of described positive voltage correspondence is modified to the transmitance of described average brightness value correspondence;
In same group of two voltages, when the transmitance of positive voltage correspondence transmitance less than the negative voltage correspondence, and the difference of described two transmitances is during greater than predetermined threshold value, apply forward bias voltage to described liquid crystal panel, described forward bias voltage makes the difference of described two transmitances be not more than predetermined threshold value; In the application time of described forward bias voltage, read the brightness value of default number from described liquid crystal panel, the brightness value of the described default number that reads out averaged calculate average brightness value, the transmitance of described negative voltage correspondence is modified to the transmitance of described average brightness value correspondence.
6. the measuring method of liquid crystal panel transmitance according to claim 1, it is characterized in that, is in the symmetrical voltage at center what import successively with described initial voltage, every two adjacent voltages are one group, two voltages of same group are identical with the absolute value of the difference of described initial voltage, input voltage greater than described initial voltage in two described same group voltages is a positive voltage, is negative voltage less than the input voltage of described initial voltage, and this method also comprises:
In same group of two voltages, when the transmitance of positive voltage correspondence transmitance greater than the negative voltage correspondence, and the difference of described two transmitances increases the application time of described negative voltage during greater than predetermined threshold value, makes the difference of described two transmitances be not more than predetermined threshold value; In the application time of described negative voltage, read the brightness value of default number from described liquid crystal panel, the brightness value of the described default number that reads out averaged calculate average brightness value, the transmitance of described positive voltage correspondence is modified to the transmitance of described average brightness value correspondence;
In same group of two voltages, when the transmitance of positive voltage correspondence transmitance less than the negative voltage correspondence, and the difference of described two transmitances increases the application time of described positive voltage during greater than predetermined threshold value, makes the difference of described two transmitances be not more than predetermined threshold value; In the application time of described positive voltage, read the brightness value of default number from described liquid crystal panel, the brightness value of the described default number that reads out averaged calculate average brightness value, the transmitance of described negative voltage correspondence is modified to the transmitance of described average brightness value correspondence.
7. the measuring system of a liquid crystal panel transmitance is characterized in that, comprising:
The voltage output module is used for importing described initial voltage respectively, being that the symmetrical voltage at center is as display voltage with described initial voltage to liquid crystal panel;
Data acquisition module is used for obtaining respectively the brightness value of described liquid crystal panel under described display voltage, and described brightness value is used to draw corresponding transmitance.
8. the measuring system of liquid crystal panel transmitance according to claim 7, it is characterized in that described voltage output module is used at interval importing described initial voltage and being the symmetrical voltage at center with described initial voltage to described liquid crystal panel successively according to Preset Time.
9. the measuring system of liquid crystal panel transmitance according to claim 7 is characterized in that, described data acquisition module comprises:
Reading unit is used for reading the brightness value of default number from described liquid crystal panel in described each display voltage time corresponding interval;
Computing unit is used for brightness value with the described default number that reads out and averages and calculate average brightness value, and described average brightness value is described liquid crystal panel corresponding brightness value under described display voltage.
10. the measuring system of liquid crystal panel transmitance according to claim 7 is characterized in that, also comprises:
The first data correction module, be used for the transmitance of the transmitance of the positive voltage correspondence in same group greater than the negative voltage correspondence, and the difference of described two transmitances is during greater than predetermined threshold value, apply the negative sense bias voltage to described liquid crystal panel, described negative sense bias voltage makes the difference of described two transmitances be not more than predetermined threshold value; Described data acquisition module also is used in the application time of described negative sense bias voltage, read the brightness value of default number from described liquid crystal panel, the brightness value of the described default number that reads out averaged calculate average brightness value, the transmitance of described positive voltage correspondence is modified to the transmitance of described average brightness value correspondence;
The described first data correction module also is used for the transmitance of the transmitance of positive voltage correspondence in same group less than the negative voltage correspondence, and the difference of described two transmitances is during greater than predetermined threshold value, apply forward bias voltage to described liquid crystal panel, described forward bias voltage makes the difference of described two transmitances be not more than predetermined threshold value; Described data acquisition module also is used in the application time of described forward bias voltage, read the brightness value of default number from described liquid crystal panel, the brightness value of the described default number that reads out averaged calculate average brightness value, the transmitance of described negative voltage correspondence is modified to the transmitance of described average brightness value correspondence.
11. the measuring system of liquid crystal panel transmitance according to claim 7 is characterized in that, also comprises:
The second data correction module, be used at same group of two voltages, when the transmitance of positive voltage correspondence transmitance greater than the negative voltage correspondence, and the difference of described two transmitances is during greater than predetermined threshold value, increase the application time of described negative voltage, make the difference of described two transmitances be not more than predetermined threshold value; Described data acquisition module also is used in the application time of described negative voltage, read the brightness value of default number from described liquid crystal panel, the brightness value of the described default number that reads out averaged calculate average brightness value, the transmitance of described positive voltage correspondence is modified to the transmitance of described average brightness value correspondence;
The described second data correction module also is used at same group of two voltages, when the transmitance of positive voltage correspondence transmitance less than the negative voltage correspondence, and the difference of described two transmitances is during greater than predetermined threshold value, increase the application time of described positive voltage, make the difference of described two transmitances be not more than predetermined threshold value; Described data acquisition module also is used in the application time of described positive voltage, read the brightness value of default number from described liquid crystal panel, the brightness value of the described default number that reads out averaged calculate average brightness value, the transmitance of described negative voltage correspondence is modified to the transmitance of described average brightness value correspondence.
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