CN101937634A - Picture regulating method and device of liquid crystal panel - Google Patents
Picture regulating method and device of liquid crystal panel Download PDFInfo
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Abstract
The embodiment of the invention discloses picture regulating method and device of a liquid crystal panel, relating to the technical field of liquid crystal display and aims to increase picture display effect of the liquid crystal panel. The picture regulating method comprises the following steps of: selecting a test picture; regulating a blink value of the test picture to obtain a critical public reference voltage; obtaining a gray-scale picture; and regulating a gamma curve of the gray-scale picture to obtain a critical source electrode driver voltage. The invention can increase the picture display effect of the liquid crystal panel.
Description
Technical field
The present invention relates to technical field of liquid crystal display, relate in particular to a kind of picture adjusting method and device of liquid crystal panel.
Background technology
The dull and stereotyped LCD TV of large scale more and more has been subjected to numerous consumers' favor, and the consumer is also more and more higher to the requirement of display image and image quality.
Because the inherent characteristic of liquid crystal molecule, LCD needs the continuous conversion of positive-negative polarity in display frame, therefore this just causes the positive and negative gray scale voltage absolute value difference under the different pictures bigger easily, thereby the float degree that makes human eye feel under different pictures is also different.In addition, because there is certain distortion in the LCD self characteristics between input voltage and output image.In view of above 2 points, the adjusting of LCD being carried out float and degree of distortion is necessary.
But the inventor finds in realizing process of the present invention, and it is not fine utilizing the picture display effect of the liquid crystal panel that film flicker of the prior art or gamma curve method of adjustment obtain.
Summary of the invention
The embodiment of the invention provides a kind of picture adjusting method and device of liquid crystal panel, to improve the picture display effect of liquid crystal panel.
The embodiment of the invention adopts following technical scheme:
A kind of picture adjusting method of liquid crystal panel comprises:
Select test pictures;
Obtain and adjust the flicker value of described test pictures, make that the flicker value satisfied first of described test pictures is pre-conditioned, and obtain the critical common reference voltage of adjusted flicker value correspondence;
Obtain the GTG picture;
Gamma curve to described GTG picture is adjusted, and makes that the gamma curve satisfied second of described GTG picture is pre-conditioned, and obtains the critical source electrode driver voltage of adjusted gamma curve correspondence.
A kind of picture regulator of liquid crystal panel comprises:
The picture and selecting unit is used to select test pictures;
The flicker value adjustment unit is used to obtain and adjust the flicker value of described test pictures, and it is first pre-conditioned to make that the flicker value of described test pictures satisfies, and obtains the critical common reference voltage of adjusted flicker value correspondence;
The picture selected cell is used to obtain the GTG picture;
Gamma curve adjustment unit is used for the gamma curve of described GTG picture is adjusted, and makes that the gamma curve satisfied second of described GTG picture is pre-conditioned, and obtains the critical source electrode driver voltage of adjusted gamma curve correspondence.
The picture adjusting method of the liquid crystal panel that the embodiment of the invention provides and device combine the flicker value adjustment and the adjustment of gamma curve of liquid crystal panel, therefore, can improve the picture display effect of liquid crystal panel.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, the accompanying drawing of required use is done an introduction simply in will describing embodiment 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 picture adjusting method of the embodiment of the invention one liquid crystal panel;
Fig. 2 is the process flow diagram of the picture adjusting method of the embodiment of the invention two liquid crystal panels;
Fig. 3 is the synoptic diagram of the applied system of method of the embodiment of the invention three;
Fig. 4 is that film flicker is regulated the picture synoptic diagram in the method for the embodiment of the invention three;
Fig. 5 is the synoptic diagram of the picture regulator of embodiment of the invention liquid crystal panel;
Fig. 6 is the structural drawing of the picture regulator of embodiment of the invention liquid crystal panel.
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.
Because the driving under long-time direct current mode, so liquid crystal panel can produce the liquid crystal molecule catabiosis, thereby had a strong impact on the life-span of liquid crystal panel.So liquid crystal panel generally adopts the AC driving mode to drive.Moreover liquid crystal layer is equal to an electric capacity on circuit equivalent, even under same GTG, its signal also can be because of the influence of positive and negative half period voltage difference, thereby the brightness of picture is inconsistent before and after causing.In addition, human eye is very sensitive to brightness, when film flicker frequency during greater than the frequency of human eye identification, will feel film flicker.
For improving picture display effect, as shown in Figure 1, the picture adjusting method of the embodiment of the invention one liquid crystal panel comprises the steps:
In embodiments of the present invention, can be according to the resolution and the reversal of poles mode of described liquid crystal panel, selecting flicker level is the test pictures of setting value.
For example can select the most serious picture of the flicker value of picture as test pictures.So, after the most serious test pictures of this flicker value was adjusted flicker value, the picture that other flicker value is littler just more can satisfy the requirement of user to display quality.That is to say that select the most serious picture of flicker value as test pictures, the picture display effect of the liquid crystal panel that obtains is better.Should " flicker level is a setting value " can freely define according to the fine or not of display quality that expectation obtains by the user.
Wherein reversal of poles mode comprises: row counter-rotating, row counter-rotating, some counter-rotating or the like.In embodiments of the present invention, test pictures and liquid crystal panel are sub-pixel point corresponding sub-pixel points, and when pixel voltage reversed, the brightness changing value was maximum, film flicker degree maximum.
Step 121, constantly adjust the common reference voltage of described liquid crystal panel, and obtain the flicker value of different common reference voltage.
Step 122, described flicker value is quantized.
Step 123, flicker value that will be through quantizing compare with default critical flicker value.
Because human eye has certain limit for the perception of film flicker,,, can be this value defined the critical flicker value even the film flicker human eye also can't perception when the flicker level of picture during less than certain value.Certainly, other numerical value littler than this critical flicker value all can be used as the critical flicker value, and the display quality of the display frame that obtains like this can be higher.
Step 124, when the difference of described flicker value and described default critical flicker value satisfied first when pre-conditioned through quantizing, the common reference voltage of repeating step 121 and 122 the described liquid crystal panel of adjustment, make described flicker value pre-conditioned with the difference satisfied first of described default critical flicker value through quantizing, and when the difference satisfied first of described flicker value through quantizing and described default critical flicker value is pre-conditioned, obtain the common reference voltage of described flicker value correspondence through quantizing, and with described common reference voltage as critical common reference voltage.
In this step, the quality of the described first pre-conditioned display effect that can be sought out according to him by the user is determined, for example can be a value, also can be a scope.Preferably, in embodiments of the present invention, can in described flicker value during, promptly obtain the common reference voltage of described flicker value correspondence through quantizing less than described default critical flicker value through quantizing, and with described common reference voltage as critical common reference voltage VCOM.
Gamma curve reflection be panel penetrance size different GTGs under, the panel penetrance is directly related with brightness, and penetrance follows the voltage that is applied on the liquid crystal molecule relevant.But, because this corresponding relation is non-linear, tend in photoelectric conversion process, lose, therefore will be to this non-linear compensating, with the perceptibility of reduction human eye to difference in brightness.In addition, the voltage under the different GTGs of Gamma curve correspondence is to be realized by different resistance string dividing potential drops.
In embodiments of the present invention, the quantity of Ce Shi GTG as required can obtain the GTG picture of different GTGs by software unit, 64 GTG pictures for example, 128 GTG pictures, 256 GTG pictures etc.
In the process that the gamma curve is adjusted, because Gamma curve reflection is panel penetrance size under the different GTGs, the panel penetrance is directly related with brightness, and penetrance is relevant with the voltage that is applied on the liquid crystal molecule, so the real embodiment of constantly adjusting the source electrode driver voltage of liquid crystal panel and obtaining the process of different brightness values is exactly the variation of the gamma curve of this liquid crystal panel.Thus, it is second pre-conditioned whether the gamma curve of GTG picture satisfies, and is that the difference between the penetrance (brightness value) of penetrance (brightness value) by certain point on this curve and desirable gamma curve embodies.
Carrying out the gamma curve when adjusting, can be according to the grey exponent number of selected GTG picture, determine the pairing voltage of the brightest GTG and dull gray rank.So, can in the scope of the pairing voltage of this brightest GTG and dull gray rank, regulate.In the process of adjusting, can comprise:
The source electrode driver voltage of step 141, the described liquid crystal panel of adjustment, and the brightness value of acquisition described each GTG of GTG picture under different source electrode driver voltage.Simultaneously, the corresponding relation of described brightness value and described GTG picture is done normalized.
Step 142, described brightness value and preset value are compared.
Step 143, do not satisfy second when pre-conditioned when the difference of described brightness value and preset value, repeat to adjust the source electrode driver voltage of described liquid crystal panel, make that the difference satisfied second of described brightness value and preset value is pre-conditioned, and satisfy second when pre-conditioned in the difference of described brightness value and preset value, obtain the source electrode driver voltage of described brightness value correspondence, and with described source electrode driver voltage as described critical source electrode driver voltage.
In this step, the quality of the described second pre-conditioned display effect that can be sought out according to him by the user is determined, for example can be a value, also can be a scope.
It should be noted that in the process of gamma curve adjustment, the critical VCOM that is obtained according to step 11 and 12 remains unchanged.After the critical source electrode driver voltage that obtains acts on the liquid crystal panel, can change the anglec of rotation of liquid crystal molecule, thereby change the penetrance of panel, and change the brightness under each GTG simultaneously.The picture adjusting method of the liquid crystal panel that the embodiment of the invention provides, the flicker value adjustment and the adjustment of gamma curve of liquid crystal panel are combined, also promptly on the basis of the adjustment of carrying out the test pictures flicker value, carry out the adjustment of gamma curve once more, obtain critical common reference voltage and critical source electrode driver voltage and act on liquid crystal panel.Because this critical common reference voltage and critical source electrode driver voltage are to make the shake and the image distortion of picture therefore, can improve the picture display effect of liquid crystal panel.
After finishing the adjustment of gamma curve, also can carry out the flicker value adjustment once more, thereby further improve the picture display effect of liquid crystal panel.
In addition, in order to improve adjustment efficient, conveniently adjust the picture display effect of panel, as shown in Figure 2, on basis shown in Figure 1, the picture adjusting method of the liquid crystal panel of the embodiment of the invention two also can comprise:
Below, three to describe in detail be how to realize what film flicker and gamma curve were adjusted in conjunction with the embodiments.
Supposing to need to adjust a resolution is M*N, and reversed polarity is the some counter-rotating, and source electrode driver is the liquid crystal panel of 8bit, can use test macro as shown in Figure 3.Detailed process is as follows:
Connect under the normal situation in whole test system, be the test pictures of M*N by the 312 selected resolution of the software unit in the dynamic adjustment unit 31 at first, simultaneously according to reversed polarity, test pictures satisfies the requirement that point is lighted at interval, promptly the odd point of this test pictures shows, even number point does not show.Because human eye is the most responsive to green, so showing, the point that shows to be green, test pictures as shown in Figure 4 (among the figure with the shown in green point of grey colour specification).The test pictures of Xuan Zeing in the manner described above, its flicker level maximum.The HDMI/VGA/DVI of signal generating unit 311 is converted to LVDS/mini-LVDS by signal controlling and converting unit 34.
Then start optic test unit 32, obtain the flicker value of test pictures, and this numerical value fed back to dynamic adjustment unit 31, dynamically adjustment unit 31 converts this numerical value to corresponding VCOM voltage, so that adjust VCOM voltage, adjusted critical VCOM magnitude of voltage stores in the storage unit 33, and writes in the driver in the liquid crystal panel 35 by signal controlling and converting unit 34, thereby affact on the liquid crystal pixel, reach the purpose of the flicker value of adjusting test pictures.The wherein dynamically course of work of adjustment unit such as the description in the step 12.
After VCOM voltage is adjusted, will carry out the adjustment of gamma curve.Need to prove that in the process of adjusting the gamma curve, critical VCOM voltage will remain unchanged.Gamma curve adjustment process is as follows:
At first need determining the grey exponent number of debugging in software unit 312, can select different grey exponent numbers according to the debugging degree of accuracy, is example with 256 GTGs for example.Then, determine the pairing magnitude of voltage of the brightest GTG and dull gray rank again.According to gamma curve normalization principle, the penetrance on the brightest GTG and dull gray rank is respectively 100% and 0%, so the voltage on the brightest GTG and dull gray rank can be determined accordingly.Thus, can determine the debugging scope determined scope of voltage of the voltage of the brightest GTG and dull gray rank (promptly by) of a source electrode driver voltage, so that fast and effeciently regulate.
Then, as required, set the standard deviation of actual gamma curve and desirable gamma curve.Because therefore the nonlinear relationship of gamma curve can set different standard deviations, thereby it is easy, quick, efficient to make the gamma curve adjust.For example, than dull gray rank places (as GTG 0-GTG 50) but the established standards difference is 0.1%, at middle GTG place (as GTG 51-GTG 150) but the established standards difference is 0.15%, at brighter GTG place (as GTG 151-GTG 255) but the established standards difference is 0.2%.After the pairing voltage of ash exponent number, the brightest GTG and dull gray rank, standard deviation configure, start optic test unit 32, the brightness of each GTG is tested.Dynamically adjustment unit 31 compares the brightness value and the preset value of each GTG, when the difference of described brightness value and preset value is in preset range, obtain the source electrode driver voltage of described brightness value correspondence, and with described source electrode driver voltage as described critical source electrode driver voltage.Will this critical source electrode driver voltage be written in the source electrode driver in the liquid crystal panel by signal controlling and converting unit 34 then, reach the purpose of adjusting liquid crystal pixel voltage, thereby change the anglec of rotation of liquid crystal molecule, change the penetrance of panel, the brightness of GTG simultaneously also changes thereupon.So just, can reach actual gamma curve infinitely near the purpose of ideal curve, realize the optimization of picture display quality.
In this embodiment, obtain test pictures and GTG picture, in prior art, utilize special equipment to obtain test pictures and GTG picture, can reduce cost by the software unit 312 in the dynamic adjustment unit 31.
As can be seen from the above-described embodiment, combine, can improve the picture display effect of liquid crystal panel by flicker value adjustment and the adjustment of gamma curve with liquid crystal panel.
In addition, as shown in Figure 5, the embodiment of the invention also provides a kind of picture regulator of liquid crystal panel, comprising:
Picture and selecting unit 51 is used to select test pictures; Flicker value adjustment unit 52 is used to obtain and adjust the flicker value of described test pictures, and it is first pre-conditioned to make that the flicker value of described test pictures satisfies, and obtains the critical common reference voltage of adjusted flicker value correspondence; Picture selected cell 53 is used to obtain the GTG picture; Gamma curve adjustment unit 54 is used for the gamma curve of described GTG picture is adjusted, and makes that the gamma curve satisfied second of described GTG picture is pre-conditioned, and obtains the critical source electrode driver voltage of adjusted gamma curve correspondence.
Wherein, as previously mentioned, in embodiments of the present invention, can be according to the resolution and the reversal of poles mode of described liquid crystal panel, selecting flicker level is the test pictures of setting value.For example can select the most serious picture of the flicker value of picture as test pictures.So, after the most serious test pictures of this flicker value was adjusted flicker value, the picture that other flicker value is littler just more can meet the demands.That is to say that select the most serious picture of flicker value as test pictures, the picture display effect of the liquid crystal panel that obtains is better.Therefore, described picture and selecting unit 51 specifically is used for according to the resolution of described liquid crystal panel and reversal of poles mode, and selecting flicker level is the test pictures of setting value.Wherein, the implication of " flicker level is a setting value " is with aforesaid identical.
Further, described flicker value adjustment unit 52 comprises: voltage regulator module is used to adjust the common reference voltage of described liquid crystal panel, and obtains corresponding flicker value; Quantization modules is used for described flicker value is quantized; Comparison module is used for flicker value through quantizing and the critical flicker value of presetting are compared; Processing module, be used for when the difference of described flicker value and described default critical flicker value satisfied first when pre-conditioned through quantizing, repeat to adjust the common reference voltage of described liquid crystal panel, make described flicker value pre-conditioned with the difference satisfied first of described default critical flicker value through quantizing, and in the difference of described flicker value and described default critical flicker value through quantizing satisfied first when pre-conditioned, obtain the common reference voltage of described flicker value correspondence through quantizing, and with described common reference voltage as critical common reference voltage.
Further, described gamma curve adjustment unit 54 comprises: voltage regulator module, be used to adjust the source electrode driver voltage of described liquid crystal panel, the brightness value of acquisition described each GTG of GTG picture under different source electrode driver voltage, and described brightness value and described GTG picture corresponding relation done normalized; Comparison module is used for described brightness value and preset value are compared; Processing module, be used for not satisfying second when pre-conditioned when the difference of described brightness value and preset value, repeat to adjust the source electrode driver voltage of described liquid crystal panel, make that the difference satisfied second of described brightness value and preset value is pre-conditioned, and satisfy second when pre-conditioned in the difference of described brightness value and preset value, obtain the source electrode driver voltage of described brightness value correspondence, and with described source electrode driver voltage as described critical source electrode driver voltage.
That wherein describes among first pre-conditioned and the second pre-conditioned meaning and the method embodiment is identical.
In addition, as shown in Figure 6, described device also can further comprise: storage unit 55 is used to store described critical common reference voltage and described critical source electrode driver voltage.
The principle of work of wherein said device can be with reference to the description among the preceding method embodiment.
The picture regulator of the liquid crystal panel that the embodiment of the invention provides combines the flicker value adjustment and the adjustment of gamma curve of liquid crystal panel, therefore, can improve the picture display effect of liquid crystal panel.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method, be to instruct relevant hardware to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
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 (10)
1. the picture adjusting method of a liquid crystal panel is characterized in that, comprising:
Select test pictures;
Obtain and adjust the flicker value of described test pictures, make that the flicker value satisfied first of described test pictures is pre-conditioned, and obtain the critical common reference voltage of adjusted flicker value correspondence;
Obtain the GTG picture;
Gamma curve to described GTG picture is adjusted, and makes that the gamma curve satisfied second of described GTG picture is pre-conditioned, and obtains the critical source electrode driver voltage of adjusted gamma curve correspondence.
2. method according to claim 1 is characterized in that, described selection test pictures is specially:
According to the resolution and the reversal of poles mode of described liquid crystal panel, selecting flicker level is the test pictures of setting value.
3. method according to claim 1, it is characterized in that, described acquisition is also adjusted the flicker value of described test pictures, and it is first pre-conditioned to make that the flicker value of described test pictures satisfies, and the critical common reference voltage that obtains adjusted flicker value correspondence comprises:
Adjust the common reference voltage of described liquid crystal panel, and obtain corresponding flicker value;
Described flicker value is quantized;
Flicker value through quantizing is compared with the critical flicker value of presetting;
When the difference of described flicker value and described default critical flicker value satisfied first when pre-conditioned through quantizing, repeat to adjust the common reference voltage of described liquid crystal panel, pre-conditioned until described flicker value with the difference satisfied first of described default critical flicker value through quantizing, and when the difference satisfied first of described flicker value through quantizing and described default critical flicker value is pre-conditioned, obtain the common reference voltage of described flicker value correspondence through quantizing, and with described common reference voltage as critical common reference voltage.
4. method according to claim 1, it is characterized in that, described gamma curve to described GTG picture is adjusted, and it is second pre-conditioned to make that the gamma curve of described GTG picture satisfies, and the critical source electrode driver voltage that obtains adjusted gamma curve correspondence comprises:
Adjust the source electrode driver voltage of described liquid crystal panel, obtain the brightness value of described each GTG of GTG picture under different source electrode driver voltage, and the corresponding relation of described brightness value and described GTG picture is done normalized;
Described brightness value and preset value are compared;
When the difference of described brightness value and preset value does not satisfy second when pre-conditioned, repeat to adjust the source electrode driver voltage of described liquid crystal panel, difference satisfied second until described brightness value and preset value is pre-conditioned, and satisfy second when pre-conditioned in the difference of described brightness value and preset value, obtain the source electrode driver voltage of described brightness value correspondence, and with described source electrode driver voltage as described critical source electrode driver voltage.
5. according to the arbitrary described method of claim 1-4, it is characterized in that described method also comprises:
Store described critical common reference voltage and described critical source electrode driver voltage.
6. the picture regulator of a liquid crystal panel is characterized in that, comprising:
The picture and selecting unit is used to select test pictures;
The flicker value adjustment unit is used to obtain and adjust the flicker value of described test pictures, and it is first pre-conditioned to make that the flicker value of described test pictures satisfies, and obtains the critical common reference voltage of adjusted flicker value correspondence;
The picture selected cell is used to obtain the GTG picture;
Gamma curve adjustment unit is used for the gamma curve of described GTG picture is adjusted, and makes that the gamma curve satisfied second of described GTG picture is pre-conditioned, and obtains the critical source electrode driver voltage of adjusted gamma curve correspondence.
7. device according to claim 6 is characterized in that, described picture and selecting unit specifically is used for according to the resolution of described liquid crystal panel and reversal of poles mode, and selecting flicker level is the test pictures of setting value.
8. device according to claim 6 is characterized in that, described flicker value adjustment unit comprises:
Voltage regulator module is used to adjust the common reference voltage of described liquid crystal panel, and obtains corresponding flicker value;
Quantization modules is used for described flicker value is quantized;
Comparison module is used for flicker value through quantizing and the critical flicker value of presetting are compared;
Processing module, be used for when the difference of described flicker value and described default critical flicker value satisfied first when pre-conditioned through quantizing, repeat to adjust the common reference voltage of described liquid crystal panel, make described flicker value pre-conditioned with the difference satisfied first of described default critical flicker value through quantizing, and in the difference of described flicker value and described default critical flicker value through quantizing satisfied first when pre-conditioned, obtain the common reference voltage of described flicker value correspondence through quantizing, and with described common reference voltage as critical common reference voltage.
9. device according to claim 6 is characterized in that, described gamma curve adjustment unit comprises:
Voltage regulator module is used to adjust the source electrode driver voltage of described liquid crystal panel, obtains the brightness value of described each GTG of GTG picture under different source electrode driver voltage, and described brightness value and described GTG picture corresponding relation are done normalized;
Comparison module is used for described brightness value and preset value are compared;
Processing module, be used for not satisfying second when pre-conditioned when the difference of described brightness value and preset value, repeat to adjust the source electrode driver voltage of described liquid crystal panel, make that the difference satisfied second of described brightness value and preset value is pre-conditioned, and satisfy second when pre-conditioned in the difference of described brightness value and preset value, obtain the source electrode driver voltage of described brightness value correspondence, and with described source electrode driver voltage as described critical source electrode driver voltage.
10. according to the arbitrary described device of claim 6-9, it is characterized in that described device also comprises:
Storage unit is used to store described critical common reference voltage and described critical source electrode driver voltage.
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