CN1936653A - Liquid crystal display and its drive method - Google Patents
Liquid crystal display and its drive method Download PDFInfo
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- CN1936653A CN1936653A CN 200610071469 CN200610071469A CN1936653A CN 1936653 A CN1936653 A CN 1936653A CN 200610071469 CN200610071469 CN 200610071469 CN 200610071469 A CN200610071469 A CN 200610071469A CN 1936653 A CN1936653 A CN 1936653A
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Abstract
A driving method for the LCD includes the process: first to note the menu data displayed on the LCD in every frame tome; then to compare the data displayed in every frame to the data of the former frame; last to adjust the grey difference between the highest brightness and the smallest brightness displayed by the image element of the LCD according to the comparing result. So it can improve the displaying quality of the LCD.
Description
Technical field
The present invention relates to a kind of display device and driving method thereof, particularly relate to a kind of LCD (Liquid Crystal Display, LCD) and driving method.
Background technology
Because the arrival of information society, also grow with each passing day as the demand of the display of information media, so industry drops into the development of related display with all strength.Wherein, (Cathode RayTube, CRT) therefore display monopolizes the monitor market all the year round because of having good display quality and technology maturation with cathode-ray tube (CRT) again.Yet, high-tech product tends to frivolous and miniaturization gradually in recent years, therefore have that high image quality, space utilization efficient are good, the LCD of low consumpting power, advantageous characteristic such as radiationless replaces cathode-ray tube display gradually, and becomes the main flow of present monitor market.
Above-mentioned two kinds of displays all have its strengths and weaknesses, with regard to display quality, cathode-ray tube display is to utilize electron beam and drive luminous with pulsed (impulse type), that is to say in a frame time, after the pixel of cathode-ray tube display is subjected to a short time pulse excitation luminous, recover dark attitude immediately, so pixel intensity will change in time, so when showing dynamic menu, can have better display quality.Yet, during with the luminous demonstration tableaux of pulsed, but being easy to generate the problem of film flicker, thereby making the beholder after watching this tableaux for a long time, it is tired uncomfortable that eyes are felt easily.
In LCD, be to come driven for emitting lights at present mostly with freeze mode (hold type).In other words, in each frame time of this LCD, definite value is kept in the brightness of its backlight, only relies on the rotation of liquid crystal to decide the brightness of pixel, and so, pixel is after being driven, and its brightness will be kept definite value.Therefore, the problem of film flicker can not take place in LCD when showing tableaux, can make beholder's eyes when watching tableaux comparatively comfortable.Yet,, can produce the problem of fuzzy pictures (Blurring) because of the characteristic of human eye vision if show dynamic menu with this Backlight For Liquid Crystal Display Panels.
In order to make LCD when showing dynamic menu, can have better display quality, known technology is to use a class pulsed backlight, i.e. this backlight switch periodically is so that LCD can have identical display quality with cathode-ray tube display when showing dynamic menu.In general, the luminous amplitude of this type of pulsed backlight is kept definite value, and promptly the luminance difference of the high-high brightness of backlight and minimum brightness is fixed.Yet this kind practice but can make LCD have the shortcoming of cathode-ray tube display when showing tableaux simultaneously, thereby loses its advantage originally.
Summary of the invention
Therefore, the purpose of this invention is to provide a kind of Liquid Crystal Display And Method For Driving,, and when showing tableaux, do not have the phenomenon of flicker so that LCD has better display quality when showing dynamic menu.
Based on above-mentioned and other purpose, the present invention proposes a kind of driving method of LCD, and it comprises the following steps: at first, record LCD shown picture data in each frame time.Then, compare shown picture data in picture data shown in each frame time and former frame time.Afterwards, in this frame time, adjust the shown high-high brightness of the pixel of LCD and the gray value differences of minimum brightness according to comparative result.Wherein, relatively the method for picture data for example be picture data shown in each frame time of comparison with interior shown picture data of former frame time in whether similar pattern is arranged.When similar pattern, then calculate the amount of movement of this pattern, be to show dynamic menu also or tableaux to judge LCD, and adjust the luminous amplitude of backlight according to judged result, promptly adjust the luminance difference of backlight high-high brightness and minimum brightness.
In the driving method of above-mentioned LCD, LCD for example has a backlight, and the method that makes LCD have better display quality in this frame time for example is to judge that whether amount of movement is greater than a reference value earlier.When amount of movement during greater than reference value, we can judge that LCD is to show dynamic menu, then the luminous amplitude that comes from this frame time backlight is adjusted into A1, when amount of movement during less than reference value, we can judge that LCD is to show tableaux, then the luminous amplitude that comes from this frame time backlight is adjusted into A2, wherein A1＞A2.In addition, when amount of movement equaled reference value, the luminous amplitude that comes from this frame time backlight can be between A1 and A2.
In the driving method of above-mentioned LCD, backlight for example comprises a plurality of cathode fluorescent tubes, and the method for the luminous amplitude of adjustment backlight for example is to adjust the size of current that feeds these cathode fluorescent tubes.
In the driving method of above-mentioned LCD, backlight also comprises an inverter circuit, this inverter circuit is suitable for applying a voltage waveform in the luminous amplitude of cathode fluorescent tube with the adjustment backlight, and voltage waveform is divided into a plurality of positive half cycles and a plurality of negative half period, and the method for the luminous amplitude of adjustment backlight comprises the voltage waveform of adjusting inverter circuit.In one embodiment, the method of adjusting voltage waveform comprises that the maximum voltage amplitude of sustaining voltage waveform and minimum voltage amplitude are constant, and in the positive half cycle of voltage waveform, produce a plurality of negative voltage pulses, produce a plurality of positive voltage pulses in the negative half period of voltage waveform.In another embodiment, the method of adjusting voltage waveform comprises that the maximum voltage amplitude of sustaining voltage waveform and minimum voltage amplitude are constant, and in the positive half cycle of voltage waveform, produce a plurality of negative-going pulses, produce a plurality of direct impulses in the negative half period of voltage waveform.
In the driving method of above-mentioned LCD, backlight for example comprises a plurality of light emitting diode matrixs, and the method for the luminous amplitude of adjustment backlight for example is to adjust size of current that feeds these light emitting diode matrixs or the number of adjusting the lumination of light emitting diode of these light emitting diode matrixs.
In the driving method of above-mentioned LCD, LCD for example has one scan formula backlight, it comprises a plurality of sub-light sources, correspond respectively to different blocks of LCD, and these sub-light sources are switch periodically, and the method that makes LCD have better display quality in this frame time for example is to judge that earlier LCD is to show that dynamic pattern also or static pattern at each block.When LCD is when showing dynamic pattern, then the luminous amplitude of sub-light source in this frame time with the block at corresponding this dynamic pattern place of scanning type backlight is adjusted into A1.When LCD is when showing static pattern, then the luminous amplitude of sub-light source in this frame time with the block at corresponding this static pattern place of scanning type backlight is adjusted into A2, wherein A1＞A2.
In the driving method of above-mentioned LCD, each sub-light source for example is a cathode fluorescent tube, and the method for the luminous amplitude of adjustment scanning type backlight comprises the size of current of adjusting these cathode fluorescent tubes of feeding.
In the driving method of above-mentioned LCD, backlight also comprises an inverter circuit, this inverter circuit is suitable for applying a voltage waveform in the luminous amplitude of cathode fluorescent tube with the adjustment scanning type backlight, and voltage waveform is divided into a plurality of positive half cycles and a plurality of negative half period, and the method for the luminous amplitude of adjustment scanning type backlight comprises the voltage waveform of adjusting this inverter circuit.In one embodiment, the method of wherein adjusting the voltage waveform of inverter circuit comprises that the maximum voltage amplitude of sustaining voltage waveform and minimum voltage amplitude are constant, and in the positive half cycle of voltage waveform, produce a plurality of negative voltage pulses, produce a plurality of positive voltage pulses in the negative half period of voltage waveform.In another embodiment, the method of adjusting voltage waveform comprises that the maximum voltage amplitude of sustaining voltage waveform and minimum voltage amplitude are constant, and in the positive half cycle of voltage waveform, produce a plurality of negative-going pulses, produce a plurality of direct impulses in the negative half period of voltage waveform.
In the driving method of above-mentioned LCD, each sub-light source for example is a light emitting diode matrix, and the method for the luminous amplitude of adjustment scanning type backlight comprises the size of current of adjusting these light emitting diode matrixs of feeding or the number of adjusting the lumination of light emitting diode of these light emitting diode matrixs.
In the driving method of above-mentioned LCD, the method that makes LCD have better display quality in this frame time for example is to insert black picture in the picture data shown in this frame time.Wherein, so-calledly insert the picture data that black picture is meant input one low gray scale between a certain given period in a frame time.
In the driving method of above-mentioned LCD, the method that makes LCD have better display quality in this frame time for example is to judge that earlier LCD is to show that dynamic pattern also or static pattern.When LCD is when showing dynamic pattern, then in this frame time, insert one first black picture, and when LCD be when showing static pattern, then in this frame time, insert one second black picture, wherein the gray-scale value of the second black picture is higher than the gray-scale value of the first black picture, i.e. the brightness of the second black picture is higher than the brightness of the first black picture.
In the driving method of above-mentioned LCD, for example be in the whole image data, to insert the first black picture or the second black picture when inserting when the first black picture or second is deceived picture.
In the driving method of above-mentioned LCD, for example be in the partial picture data that show this pattern, to insert the first black picture or the second black picture when inserting when the first black picture or second is deceived picture.
In the driving method of above-mentioned LCD, before inserting the first black picture or the second black picture, for example also comprise the gray-scale value that improves picture data shown in this frame time.
In the driving method of above-mentioned LCD, LCD has a backlight, and for example also comprises this luminosity that comes from this frame time backlight of raising before inserting the first black picture or the second black picture.
The present invention also proposes a kind of LCD, but it has the backlight of a display panel and a periodic switch.Wherein, the luminance difference of the high-high brightness of backlight and minimum brightness can be with the characteristic adjustment of display frame in each cycle.
In the above-mentioned LCD, the picture characteristic for example is meant dynamic menu or tableaux.
In the above-mentioned LCD, the picture characteristic for example is meant complicated picture or dull picture.
The present invention can make LCD in the frame time that shows dynamic menu, the luminous amplitude of backlight is changed, with the effect of the luminous demonstration of pulsed that reaches similar cathode-ray tube display, and in the frame time that shows tableaux, the luminosity of backlight is fixed.Therefore, no matter LCD is to show dynamic menu or tableaux, all can have better display quality.
For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and be described with reference to the accompanying drawings as follows.
Description of drawings
Fig. 1 shows the flow chart of steps of driving method of the LCD of a preferred embodiment of the present invention.
Fig. 2 A shows LCD shown picture data that goes out in M-1 frame time.
Fig. 2 B shows LCD shown picture data that goes out in M frame time.
Fig. 3 shows the luminosity and the time relation figure of Backlight For Liquid Crystal Display Panels.
Fig. 4 shows the luminosity and the time relation figure of Backlight For Liquid Crystal Display Panels.
Fig. 5 A to Fig. 5 F shows the comparison diagram of the voltage waveform of the luminous amplitude of Backlight For Liquid Crystal Display Panels and Nverter circuit.
The reference numeral explanation
50,60: picture data
100,200,300: curve
E: pattern
L1, L2, L3, L4: line
S110: record LCD shown picture data in each frame time
S120: compare shown picture data in picture data shown in each frame time and former frame time
S130: in this frame time, adjust the shown high-high brightness of the pixel of LCD and the gray value differences of minimum brightness according to comparative result
Embodiment
The present invention judges that earlier it is static state or dynamic menu that LCD is desired picture displayed, select comparatively appropriate drive mode to drive backlight according to judged result again or whether in desiring picture displayed, insert black picture, to improve the display quality of LCD according to the judged result decision.Below will the present invention be described, but it is not that those skilled in the art can do modification to following embodiment slightly according to spirit of the present invention in order to qualification the present invention, but it still belongs to scope of the present invention for embodiment.
Fig. 1 shows the flow chart of steps of driving method of the LCD of a preferred embodiment of the present invention, Fig. 2 A shows LCD shown picture data that goes out in M-1 frame time, and Fig. 2 B shows LCD shown picture data that goes out in M frame time.In addition, Fig. 3 shows the luminosity and the time relation figure of Backlight For Liquid Crystal Display Panels.Please refer to Fig. 1, Fig. 2 A, Fig. 2 B and Fig. 3, the driving method of the LCD of present embodiment comprises the following steps:
At first, shown in step S110, record LCD shown picture data in each frame time is for example noted picture data 50 shown in M-1 the frame time.
Then, shown in step S120, compare shown picture data in picture data shown in each frame time and former frame time.For instance, before the picture data 60 in M frame time of liquid crystal display displays, earlier its picture data 50 with M-1 frame time is compared, to 60 whether similar pattern is arranged with detection picture data 50.
Afterwards, shown in step S130, in this frame time, adjust the shown high-high brightness of the pixel of LCD and the gray value differences of minimum brightness according to comparative result.For example, when similar pattern (as pattern E) is arranged in the picture data 50 and 60, then calculate the amount of movement of this pattern E, and make according to amount of movement that the luminous amplitude of Backlight For Liquid Crystal Display Panels changes in this frame time.Wherein, the computing method of amount of movement for example are the distances how many pixels the pattern E that calculates the pattern E of picture data 50 and picture data 60 differs.When the amount of movement of pattern E greater than zero the time, represent that promptly picture data 60 is dynamic menu, and when showing this dynamic menu, adjust the luminous amplitude (shown in line L1) of the backlight of LCD in M frame time according to this amount of movement.Thus, LCD can reach the effect of the luminous demonstration of pulsed of similar cathode-ray tube display when showing dynamic menu, avoid fuzzy pictures, and then promotes the display quality of dynamic menu.
In addition, the amount of movement of pattern E in picture data 50 and 60 is zero, or picture data 50 is not when 60 have similar pattern, then picture data 60 is classified as tableaux, and in showing M frame time of this tableaux, the luminosity of Backlight For Liquid Crystal Display Panels can not change (shown in line L2).Therefore, the problem of film flicker can not take place in LCD when showing tableaux, and it can make beholder's eyes when watching tableaux comparatively comfortable.
Wherein it should be noted that judge LCD be show dynamic pattern also or the method for static pattern also can utilize M frame time of comparison and M-1 frame time gray value differences at the picture data of the same area.When the gray value differences of two frame times was big, then picture data was a dynamic menu; When the gray value differences of two frame times hour, then picture data is a tableaux.
The method that promotes the display quality of LCD in the present embodiment comprises the luminous amplitude of adjusting Backlight For Liquid Crystal Display Panels, or inserts black picture in the shown picture data of LCD.Below will describe at these two kinds of methods respectively.
Fig. 4 shows the luminosity and the time relation figure of Backlight For Liquid Crystal Display Panels.Please refer to Fig. 4, in one embodiment, the method that promotes the display quality of LCD in M frame time for example is to adjust the luminous amplitude of backlight.Wherein because the luminous amplitude of backlight is bigger, then the performance of dynamic menu better, so the luminous amplitude of backlight for example is to become positive correlation with the amount of movement of pattern E in the present embodiment.Particularly, the method for the luminous amplitude of adjustment backlight for example is to judge that whether the amount of movement of pattern E is greater than a reference value earlier.This reference value is decided by demand, for example it can be made as the distance of several pixels.When the amount of movement of pattern E during greater than reference value, then making the luminous amplitude that comes from this frame time backlight is A1 (shown in line L3), and when amount of movement during less than reference value, then making the luminous amplitude that comes from this frame time backlight is A2 (shown in line L4), wherein A1＞A2.In addition, when amount of movement equaled reference value, the luminous amplitude that comes from this frame time backlight can be between A1 and A2.
Owing to the luminous amplitude of backlight can change along with the amount of movement of pattern E, when the amount of movement of pattern E during greater than reference value, the luminous amplitude of backlight is higher, so it is fuzzy to avoid dynamic menu to produce, and then promotes picture quality.In addition, because of the amount of movement of pattern E is bigger, beholder's notice when viewing and admiring concentrates on moving of pattern E, thereby does not allow to feel film flicker.On the other hand, when the amount of movement of pattern E during less than reference value, the luminous amplitude of backlight is lower, and is little because of the amount of movement of pattern E though this moment, animate descended, and is not easy to produce fuzzy, and the beholder is not easy to feel film flicker when viewing and admiring.
In the driving method of above-mentioned LCD, backlight for example comprises a plurality of sub-light sources, and when sub-light source was cathode fluorescent tube, the method for then adjusting the luminous amplitude of backlight was to adjust the size of current that feeds these cathode fluorescent tubes.
Above-mentioned backlight also comprises an inverter circuit.This inverter circuit can apply a voltage waveform in the luminous amplitude of cathode fluorescent tube with the adjustment backlight.Fig. 5 A to Fig. 5 E shows the comparison diagram of the voltage waveform of the luminous amplitude of Backlight For Liquid Crystal Display Panels and Nverter circuit.Below with the meaning of key diagram 5A to Fig. 5 E.
Please wherein show the voltage waveform of two curves 100 and 200, one curve 100 expression inverter circuits in each figure respectively earlier with reference to (a) figure of Fig. 5 A and Fig. 5 B to Fig. 5 F, another curve 200 is the luminous amplitude of backlight.Also distinctly show two curves 100 and 300 in (b) figure of Fig. 5 B to Fig. 5 F, the voltage waveform of curve 100 expression inverter circuits wherein, another curve 300 is the viewed luminous amplitude of human eye.Describe with Fig. 5 F, the luminous amplitude of backlight is different with the viewed luminous amplitude of human eye, and this is because human eye has the effect of low-pass filtering (low pass filter).And the luminous amplitude of the backlight among Fig. 5 F (a) is through promptly forming the viewed luminous amplitude of human eye among Fig. 5 F (b) after the low-pass filtering.If utilize this characteristic and cooperate the waveform of adjusting inverter circuit, just can change the luminous amplitude of backlight, and then allow the user observe different light intensities.
Referring again to Fig. 5 A to Fig. 5 F, voltage waveform is divided into a plurality of positive half cycles and a plurality of negative half period.The magnitude of voltage of positive half cycle is greater than zero, and the magnitude of voltage of negative half period is less than zero.What deserves to be mentioned is that the method for adjustment of the luminous amplitude of backlight can adopt the voltage waveform of adjusting inverter circuit and realize.For example, please refer to Fig. 5 A, the method of adjusting the voltage waveform of inverter circuit for example is that the maximum voltage amplitude and the minimum voltage amplitude of sustaining voltage waveform is constant, and in the positive half cycle of voltage waveform, produce a plurality of negative-going pulses, produce a plurality of direct impulses in the negative half period of voltage waveform.Herein, direct impulse refers to the pulse that a voltage rises, and negative voltage pulse refers to the pulse that a voltage descends.Certainly, also can be shown in Fig. 5 B to Fig. 5 F, the method of adjusting the luminous amplitude of backlight is that the maximum voltage amplitude and the minimum voltage amplitude of sustaining voltage waveform is constant, and in the positive half cycle of voltage waveform, produce a plurality of negative voltage pulses, produce a plurality of positive voltage pulses in the negative half period of voltage waveform.Be noted that the magnitude of voltage of said positive voltage pulse is greater than zero herein, and the magnitude of voltage of negative voltage pulse is less than zero.
Inspect the F to Fig. 5 one by one from Fig. 5 A, can observe out, behind the voltage waveform that changes inverter circuit, the luminous amplitude that the luminous amplitude of light source and eye-observation arrive changes really to some extent.
In the prior art, in order to adjust the luminous amplitude of backlight, can in backlight, set plural inverter circuit usually.By driving a plurality of inverter circuits, can make the luminous amplitude of backlight change to some extent to apply the maximum voltage amplitude voltage different in cathode fluorescent tube with the minimum voltage amplitude.In the present embodiment, be that to keep maximum voltage amplitude and the minimum voltage amplitude of voltage waveform constant owing to adjust the method for the luminous amplitude of backlight, therefore in backlight, need only set one group of inverter circuit, so the cost of making backlight is lower.
In addition, in the driving method of above-mentioned LCD, when sub-light source was light emitting diode matrix, the method for then adjusting the luminous amplitude of backlight module was the size of current of adjusting these light emitting diodes of feeding or the number of adjusting the lumination of light emitting diode of these light emitting diode matrixs.
In a preferred embodiment of the present invention, when backlight was the scanning type backlight, a plurality of sub-light sources that backlight corresponds respectively to different blocks of LCD are switch periodically.At this moment, adjust backlight luminous amplitude method except as the luminous amplitude of above-mentioned all sub-light sources of adjustment, also can only adjust the luminous amplitude of sub-light source of the block at pattern E place.In other words, the method for the luminous amplitude of adjustment backlight for example is to judge that whether the amount of movement of pattern E is greater than above-mentioned reference value.When amount of movement during greater than reference value, then making the luminous amplitude of sub-light source in M frame time of the block at backlight corresponding pattern E place is A1, when amount of movement during less than reference value, then making the luminous amplitude of sub-light source in M frame time of the block at backlight corresponding pattern E place is A2, wherein A1＞A2.In addition, when amount of movement equaled reference value, the luminous amplitude that comes from this frame time backlight can be between A1 and A2.
Similarly, if sub-light source is that cathode fluorescent tube and backlight comprise an inverter circuit, then also can utilize the voltage waveform of adjusting inverter circuit to reach the purpose of the luminous amplitude that changes scanning type backlight.Because the method for the luminous amplitude of adjustment scanning type backlight and advantage are to aforementioned similar, those skilled in the art can extend according to this, so do not give unnecessary details at this.
In the present embodiment, the method that promotes the display quality of LCD in M frame time also can be to insert in the picture data shown in M frame time to deceive picture, promptly be the picture data of input one low gray scale during a certain in M frame time, to obtain the effect of the luminous demonstration of similar pulsed.Wherein, the gray-scale value of the black picture that is inserted for example is to become negative correlation with the amount of movement of pattern E.For example, inserting the method for deceiving picture for example is to judge that whether amount of movement is greater than above-mentioned reference value earlier.When amount of movement during greater than reference value, then insert one first black picture, and, then insert one second black picture when amount of movement during less than reference value, wherein the gray-scale value of the second black picture is higher than first gray-scale value of deceiving picture.In addition, when amount of movement equaled reference value, the gray-scale value of the black picture that inserts can be between the gray-scale value of the first black picture and the second black picture.
Owing to the gray-scale value of the black picture that is inserted can change along with the amount of movement of pattern E,,,, and then carry picture quality so it is fuzzy to avoid dynamic menu to produce because of the gray-scale value of black picture is lower when the amount of movement of pattern E during greater than reference value.In addition, because of the amount of movement of pattern E is bigger, beholder's notice when viewing and admiring concentrates on moving of pattern E, thereby does not allow to feel film flicker.On the other hand, when the amount of movement of pattern E during less than reference value, the gray-scale value of black picture is higher, and is little because of the amount of movement of pattern E though this moment, animate descended, and is not easy to produce fuzzy, and the beholder is not easy to feel film flicker when viewing and admiring.In addition, carry out, therefore can in the whole image data, insert black picture, or only in the partial picture data of display pattern E, insert and deceive picture because the black plug picture is the distribution that scans by LCD.
What deserves to be mentioned is that the picture brightness that goes out for the plug-in effect LCD that remedies black picture is shown in the present embodiment for example can improve the gray-scale value of picture data shown in M the frame time earlier before inserting black picture.In addition, in the present embodiment also can be by improving the mode that comes from M the luminous intensity in the frame time backlight, remedy the shown picture brightness that goes out of the plug-in effect LCD of deceiving picture.
With regard to spirit of the present invention, no matter be that the method adjusting the luminous amplitude of backlight or insert black picture all is that to make LCD can be the advantage that the character of the shown picture of LCD selects class pulsed drive or freeze mode to drive.Promptly when the shown picture data of LCD is dynamic menu, then select to use the mode of class pulsed to drive; And when the shown picture data of LCD is tableaux, then select to use the mode of freeze mode to drive.Wherein, along with the difference of the mobile degree of picture, the high-high brightness that same pixel is presented in each frame time also can be different thereupon with the gray value differences of minimum brightness.Be the mobile degree of picture when big more, the shown high-high brightness of same pixel is just big more with the gray value differences of minimum brightness in each frame time; And when picture when being static, the shown high-high brightness of same pixel equates with minimum brightness in each frame time.
In addition on the one hand, select class pulsed or freeze mode to drive the determination methods of LCD, except being dynamic menu or the tableaux, also can select with freeze mode or class pulsed drive LCD according to the dullness or the complexity of picture data according to picture data.So-called picture data dull or complicated promptly is meant the relation of the gray-scale value that each pixel in the same picture data is shown.The gray-scale value shown when the pixel of a picture data is close, then represents this picture data dullness, then selects to drive LCD with freeze mode; The gray-value variation shown when the pixel of a picture data is very big, then represents this picture data complexity, then selects to drive LCD with the class pulsed.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; those skilled in the art can do some changes and retouching under the premise without departing from the spirit and scope of the present invention, so protection scope of the present invention is as the criterion with claim of the present invention.
Claims (20)
1. the driving method of a LCD is suitable for driving a LCD, and the driving method of this LCD comprises:
Write down this LCD shown picture data in each frame time;
Compare shown picture data in picture data shown in each frame time and former frame time; And
In this frame time, adjust the shown high-high brightness of the pixel of this LCD and the gray value differences of minimum brightness according to comparative result.
2. the driving method of LCD as claimed in claim 1, wherein this LCD has a backlight, and the method for adjusting the gray value differences of shown high-high brightness of the pixel of this LCD and minimum brightness comprises the luminous amplitude of adjusting this backlight.
3. the driving method of LCD as claimed in claim 2, the method for wherein adjusting the luminous amplitude of this backlight comprises:
Judge that the picture data in this frame time is dynamic menu or tableaux; And
When if this picture data is dynamic menu, then adjusting this luminous amplitude that comes from this frame time backlight is A1, and when being tableaux as if this picture data, then adjusting this luminous amplitude that comes from this frame time backlight is A2, wherein A1＞A2.
4. the driving method of LCD as claimed in claim 2, the method for wherein adjusting the luminous amplitude of this backlight comprises:
Judge that the picture data in this frame time is complicated or dull; And
When if this picture data is complexity, then adjusting this luminous amplitude that comes from this frame time backlight is A1, and when being dullness as if this picture data, then adjusting this luminous amplitude that comes from this frame time backlight is A2, wherein A1＞A2.
5. the driving method of LCD as claimed in claim 2, wherein this backlight comprises a plurality of cathode fluorescent tubes, and the method for adjusting the luminous amplitude of this backlight comprises and adjusts the size of current that feeds described cathode fluorescent tube.
6. the driving method of LCD as claimed in claim 5, wherein this backlight also comprises an inverter circuit, be suitable for applying a voltage waveform in described cathode fluorescent tube to adjust the luminous amplitude of this backlight, this voltage waveform is divided into a plurality of positive half cycles and a plurality of negative half period, and the method for adjusting the luminous amplitude of this backlight comprises this voltage waveform of adjusting this inverter circuit.
7. the driving method of LCD as claimed in claim 6, the method of wherein adjusting this voltage waveform comprises that the maximum voltage amplitude and the minimum voltage amplitude that keep this voltage waveform are constant, and in the described positive half cycle of this voltage waveform, produce a plurality of negative voltage pulses, produce a plurality of positive voltage pulses in the described negative half period of this voltage waveform.
8. the driving method of LCD as claimed in claim 6, the method of wherein adjusting this voltage waveform comprises that the maximum voltage amplitude and the minimum voltage amplitude that keep this voltage waveform are constant, and in the described positive half cycle of this voltage waveform, produce a plurality of negative-going pulses, produce a plurality of direct impulses in the described negative half period of this voltage waveform.
9. the driving method of LCD as claimed in claim 2, wherein this backlight comprises a plurality of light emitting diode matrixs, and the method for adjusting the luminous amplitude of this backlight module comprises and adjusts size of current that feeds described light emitting diode or the number of adjusting the lumination of light emitting diode of described light emitting diode matrix.
10. the driving method of LCD as claimed in claim 1, wherein this LCD has one scan formula backlight, it comprises a plurality of sub-light sources, correspond respectively to this different blocks of LCD, and described sub-light source periodically is driven, and the method for adjusting the gray value differences of shown high-high brightness of the pixel of this LCD and minimum brightness in this frame time comprises:
The picture data of judging each block in this frame time is dynamic menu or tableaux; And
When if this picture data is dynamic menu, then making this scanning type backlight is A1 to the luminous amplitude of sub-light source in this frame time that should block, when if this picture data is tableaux, then making this scanning type backlight is A2, wherein A1＞A2 to the luminous amplitude of sub-light source in this frame time that should block.
11. the driving method of LCD as claimed in claim 1, wherein this LCD has one scan formula backlight, it comprises a plurality of sub-light sources, correspond respectively to this different blocks of LCD, and described sub-light source periodically is driven, and the method for adjusting the gray value differences of shown high-high brightness of the pixel of this LCD and minimum brightness in this frame time comprises:
The picture data of judging each block in this frame time is complicated or dull; And
When if this picture data is complexity, then making this scanning type backlight is A1 to the luminous amplitude of sub-light source in this frame time that should block, when if this picture data is dullness, then making this scanning type backlight is A2, wherein A1＞A2 to the luminous amplitude of sub-light source in this frame time that should block.
12. the driving method of LCD as claimed in claim 1, also be included in and insert black picture in the picture data shown in this frame time, and the method for adjusting the gray value differences of shown high-high brightness of the pixel of this LCD and minimum brightness comprises the gray-scale value of the black picture that adjustment is inserted.
13. the driving method of LCD as claimed in claim 12, the method for wherein inserting black picture comprises:
Judge that the picture data in this frame time is dynamic menu or tableaux; And
When if this picture data is dynamic menu, then insert one first black picture, when being tableaux, then insert one second black picture as if this picture data, wherein gray-scale value of this second black picture is higher than the gray-scale value of this first black picture.
14. the driving method of LCD as claimed in claim 12, the method for wherein inserting black picture comprises:
Judge that the picture data in this frame time is complicated or dull; And
When if this picture data is complexity, then insert one first black picture, when being dullness, then insert one second black picture as if this picture data, wherein gray-scale value of this second black picture is higher than the gray-scale value of this first black picture.
15. driving method as the described LCD of arbitrary claim in claim 13 or 14, wherein when inserting the black picture of this first black picture or this second, in the data of partial picture at least of display pattern, insert this first black picture or this second black picture.
16., wherein before inserting this first black picture or this second black picture, also comprise the gray-scale value that improves picture data shown in this frame time as the driving method of the described LCD of arbitrary claim in claim 13 or 14.
17. driving method as the described LCD of arbitrary claim in claim 13 or 14, wherein this LCD has a backlight, and also comprises this luminous intensity that comes from this frame time backlight of raising before inserting this first black picture or this second black picture.
18. a LCD has:
One display panel; And
But the backlight of a periodic switch, wherein, the luminance difference of the high-high brightness of this backlight and minimum brightness can be with the characteristic adjustment of display frame in each cycle.
19. LCD as claimed in claim 18, wherein this picture characteristic is meant dynamic menu or tableaux.
20. LCD as claimed in claim 18, wherein this picture characteristic is meant complicated picture or dull picture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 200610071469 CN1936653A (en) | 2005-09-20 | 2006-03-24 | Liquid crystal display and its drive method |
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| CN200510109792.7 | 2005-09-20 | ||
| CN200510109792 | 2005-09-20 | ||
| CN 200610071469 CN1936653A (en) | 2005-09-20 | 2006-03-24 | Liquid crystal display and its drive method |
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| CN1936653A true CN1936653A (en) | 2007-03-28 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101727835A (en) * | 2008-10-24 | 2010-06-09 | 株式会社半导体能源研究所 | Display device |
| CN102024403B (en) * | 2009-09-16 | 2013-01-16 | 群康科技(深圳)有限公司 | Method for relieving image smearing and image track phenomena and related displayer |
| CN107665681A (en) * | 2017-09-26 | 2018-02-06 | 武汉华星光电技术有限公司 | Liquid crystal display driving method, system and computer-readable medium |
| WO2020118767A1 (en) * | 2018-12-12 | 2020-06-18 | 惠科股份有限公司 | Display panel driving method and driving device, and display device |
| CN113870798A (en) * | 2021-07-19 | 2021-12-31 | 义隆电子股份有限公司 | Control method applied to display |
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2006
- 2006-03-24 CN CN 200610071469 patent/CN1936653A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101727835A (en) * | 2008-10-24 | 2010-06-09 | 株式会社半导体能源研究所 | Display device |
| CN101727835B (en) * | 2008-10-24 | 2014-12-24 | 株式会社半导体能源研究所 | Display device |
| US9293088B2 (en) | 2008-10-24 | 2016-03-22 | Semiconductor Energy Laboratory Co., Ltd. | Display device |
| CN102024403B (en) * | 2009-09-16 | 2013-01-16 | 群康科技(深圳)有限公司 | Method for relieving image smearing and image track phenomena and related displayer |
| CN107665681A (en) * | 2017-09-26 | 2018-02-06 | 武汉华星光电技术有限公司 | Liquid crystal display driving method, system and computer-readable medium |
| CN107665681B (en) * | 2017-09-26 | 2020-06-05 | 武汉华星光电技术有限公司 | Liquid crystal display driving method, system and computer readable medium |
| WO2020118767A1 (en) * | 2018-12-12 | 2020-06-18 | 惠科股份有限公司 | Display panel driving method and driving device, and display device |
| US11308899B2 (en) | 2018-12-12 | 2022-04-19 | HKC Corporation Limited | Method and device for driving a display panel, and a display device |
| CN113870798A (en) * | 2021-07-19 | 2021-12-31 | 义隆电子股份有限公司 | Control method applied to display |
| CN113870798B (en) * | 2021-07-19 | 2023-08-08 | 义隆电子股份有限公司 | Control method applied to display |
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