CN105225648A - A kind of method and liquid crystal display reducing image residue - Google Patents
A kind of method and liquid crystal display reducing image residue Download PDFInfo
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Abstract
The invention discloses a kind of method and the liquid crystal display that reduce image residue.The method comprises: the gray scale voltage value obtaining each pixel in current data frame; Judge whether the gray scale voltage value of corresponding same pixel in current data frame and last data frame changes; If change, then ask for the difference of the gray scale voltage value of corresponding same pixel in last data frame and current data frame; Judge whether difference is greater than zero; If difference is greater than zero, judge whether the frame number that Frame remains unchanged is greater than the first predetermined value and is less than the second predetermined value further; If frame number is greater than the first predetermined value and be less than the second predetermined value, then reduces the gray scale voltage value of each pixel of current data frame and export pixel drive unit to.By the way, the present invention can reduce the image residue caused because stray capacitance produces feed-trough voltage in pixel drive unit, improves the display quality of picture.
Description
Technical field
The present invention relates to technical field of liquid crystal display, particularly relate to a kind of method and the liquid crystal display that reduce image residue.
Background technology
In the procedure for displaying of liquid crystal display, easily there is image residue (ImageSticking) phenomenon.Wherein, image residue refers to the same still frame of long-time display, the phenomenon of picture before staying after changing displaying contents.
The main cause that image residue produces is because the thin film transistor (TFT) (TFT) in liquid crystal display drive circuit exists stray capacitance (Cgd).In the procedure for displaying of liquid crystal display, when the voltage that sweep trace (GateLine) is carried changes, stray capacitance Cgd will produce feedthrough (FeedThrough) voltage △ V, this with public electrode voltages (Vcom) for intermediate value carries out symmetry, and then can not produce direct current residual effect when making data line (DateLine) carry out reversal of poles.Under the impact of direct current residual effect, if keep liquid crystal upper and lower polar plate voltage size constant for a long time, removable ion residual in liquid crystal molecule is easily gathered in the same side of molecule in the electric field of same direction, form internal electric field, when the picture of liquid crystal display is switched to low GTG by high gray, on this internal electric field and liquid crystal, the electric field of bottom crown is cancelled out each other, and makes liquid crystal cannot reach the deflection angle of expection, the final ImageSticking phenomenon produced as shown in Figure 1.
In actual application, flicker (Flicker) value of the display frame of liquid crystal display can as weighing the whether serious standard of current direct current residual effect.Its reason exchanges the both positive and negative polarity voltage that drives and the pressure reduction of public electrode voltages is unequal when also namely producing direct current residual effect, if data line carries out reversal of poles, picture brightness is then made to change and then make film flicker, wherein, the size of film flicker degree depends on the size of Flicker value, therefore, the conclusion that Flicker value larger direct current residual effect is more serious can be drawn.
In order to reduce direct current residual effect and then reduce ImageSticking phenomenon; usually can by the Flicker value of the liquid crystal display under monitoring specific grey-scale voltage while adjustment Vcom; when Flicker value is minimum; Vcom is now identified as best Vcom, and direct current residual effect is now minimum.But, in the process of practical application, because the character of liquid crystal material has time variation, change along with the operating time of liquid crystal display, cause the Flicker value of display frame under the situation of best Vcom along with time generation change as shown in Figure 2, thus cause direct current residual effect to worsen along with the time, and then produce serious ImageSticking phenomenon.Wherein, the situation of change of Flicker value is determined by the driving chip (DriverIC) of liquid crystal display and the character of liquid crystal material, and it, without fixing Changing Pattern, generally will reach a stationary value after a few hours.
In sum, the inreal problem solving image residue of existing method, therefore needs badly and provides a kind of scheme to solve the problems referred to above, effectively can reduce the phenomenon of image residue, improve the display quality of liquid crystal display.
Summary of the invention
The technical matters that the present invention mainly solves is to provide a kind of method and the liquid crystal display that reduce image residue, effectively can reduce the phenomenon of image residue, improves the display quality of liquid crystal display.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: provide a kind of method reducing image residue, the method comprises: the gray scale voltage value obtaining each pixel in current data frame; Judge whether the gray scale voltage value of corresponding same pixel in current data frame and last data frame changes; If change, then ask for the difference of the gray scale voltage value of corresponding same pixel in last data frame and current data frame, if do not change, then the Frame remained unchanged counted to obtain frame number that Frame remains unchanged and continue to perform the step of the gray scale voltage value obtaining each pixel in current data frame; Judge whether each difference is greater than zero; If difference is greater than zero, judge whether the frame number that current data frame remains unchanged is greater than the first predetermined value and is less than the second predetermined value further; If frame number is greater than the first predetermined value and be less than the second predetermined value, then reduces the gray scale voltage value of current data frame and export pixel drive unit to, to reduce the image residue caused because stray capacitance produces feed-trough voltage in pixel drive unit.
Wherein, the gray scale voltage value of each pixel in current data frame is reduced and the step exporting pixel drive unit to comprises: obtain the single order data processing value corresponding with the frame number that Frame remains unchanged by lookup table mode; The each coefficient of first order corresponding with each difference is obtained by lookup table mode; Obtain the product of single order data processing value corresponding to each pixel of current data frame and coefficient of first order; Obtain the difference between the gray scale voltage value of each pixel of current data frame and corresponding product and export pixel drive unit to.
Wherein, coefficient of first order along with the change of difference large and become large.
Wherein, the span of coefficient of first order is for being greater than 0 and being less than 1.
Wherein, single order data processing value along with the change of the drift value of flicker value large and become large, drift value is the difference of flicker value corresponding to liquid crystal display and minimum flicker value.
Wherein, the first predetermined value is the frame number of the Frame corresponding when drifting to predetermined flicker value from minimum flicker value of flicker value corresponding to liquid crystal display, and the second predetermined value is the frame number of the Frame corresponding when drifting to predetermined flicker of flicker value second time.
Wherein, minimum flicker value is in the process measured the flicker value of predetermined gray scale voltage, flicker value corresponding when the size of adjustment public electrode voltages makes flicker value reach minimum value.
For solving the problems of the technologies described above, another technical solution used in the present invention is: provide a kind of liquid crystal display, this liquid crystal display comprises the device reducing image residue, and this device comprises: acquiring unit, for obtaining the gray scale voltage value of each pixel in current data frame; First judging unit, for judging whether the gray scale voltage value of corresponding same pixel in current data frame and last data frame changes; Difference asks for unit, during for judging that the gray scale voltage value of corresponding same pixel in current data frame and last data frame changes when the first judging unit, asks for the difference of the gray scale voltage value of corresponding same pixel in last data frame and current data frame; Counting unit, when judging that the gray scale voltage value of corresponding same pixel in current data frame and last data frame does not change for the first judging unit, counts to obtain to the Frame remained unchanged the frame number that Frame remains unchanged; Second judging unit, for judging that difference is asked for the difference that unit asks for and whether is greater than zero; 3rd judging unit, for when the second judging unit judges that difference is greater than zero, judges whether the frame number that Frame remains unchanged is greater than the first predetermined value and is less than the second predetermined value further; Processing unit, for when the 3rd judging unit judges that frame number is greater than the first predetermined value and is less than the second predetermined value, reduce the gray scale voltage value of current data frame and export pixel drive unit to, to reduce the image residue caused because stray capacitance produces feed-trough voltage in pixel drive unit.
Wherein, processing unit reduces the gray scale voltage value of each pixel in current data frame and the operation exporting pixel drive unit to is specially: processing unit obtains the single order data processing value corresponding with the frame number that Frame remains unchanged by lookup table mode; Processing unit obtains each coefficient of first order corresponding with each difference by lookup table mode; Processing unit obtains the product of single order data processing value corresponding to each pixel of current data frame and coefficient of first order; Processing unit obtains the difference between the gray scale voltage value of each pixel of current data frame and corresponding product and exports pixel drive unit to.
Wherein, the first predetermined value is the frame number of the Frame corresponding when drifting to predetermined flicker value from minimum flicker value of flicker value corresponding to liquid crystal display, and the second predetermined value is the frame number of the Frame corresponding when drifting to predetermined flicker of flicker value second time.
The invention has the beneficial effects as follows: when the method for reduction image residue of the present invention and liquid crystal display are by detecting that the gray scale voltage value of corresponding same pixel in current data frame and last data frame changes, if the difference of the gray scale voltage value of corresponding same pixel is greater than zero and the frame number that Frame remains unchanged is greater than the first predetermined value and is less than the second predetermined value in last data frame and current data frame, then the gray scale voltage value reduced in current data frame also exports pixel drive unit to.By the way, the present invention can reduce the image residue caused because stray capacitance produces feed-trough voltage in pixel drive unit, improves the display quality of picture.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of image residue;
Fig. 2 is the schematic diagram that flicker value corresponding to liquid crystal display changes in time;
Fig. 3 is the process flow diagram of the method for the reduction image residue of the embodiment of the present invention;
Fig. 4 be reduce in Fig. 3 each pixel in current data frame gray scale voltage value and export the process flow diagram of pixel drive unit to;
Fig. 5 is the schematic diagram of the corresponding relation of the frame number that remains unchanged of the Frame of the embodiment of the present invention and single order data processing value;
Fig. 6 is the schematic diagram of the difference of the embodiment of the present invention and the corresponding relation of coefficient of first order;
Fig. 7 is the structural representation of the device reducing image residue in the liquid crystal display of the embodiment of the present invention.
Embodiment
In the middle of instructions and claims, employ some vocabulary to censure specific assembly, one of skill in the art should understand, and same assembly may be called with different nouns by manufacturer.This specification and claims book is not used as with the difference of title the mode distinguishing assembly, but is used as the benchmark of differentiation with assembly difference functionally.Below in conjunction with drawings and Examples, the present invention is described in detail.
Fig. 3 is the process flow diagram of the method for the reduction image residue of the embodiment of the present invention.If it is noted that there is result identical in fact, method of the present invention is not limited with the flow sequence shown in Fig. 3.As shown in Figure 3, the method comprises the steps:
Step S10: the gray scale voltage value obtaining each pixel in current data frame.
In step slo, obtain the gray scale voltage value of each pixel in current data frame every the schedule time and store.
Step S11: judge whether the gray scale voltage value of corresponding same pixel in current data frame and last data frame changes, if change, performs step S12, if do not change, performs step S16.
In step s 11, monitor the gray scale voltage value of corresponding same pixel in current data frame and last data frame, if change, then represent that liquid crystal display prepares to switch display frame, if do not change, then represent that liquid crystal display shows same still frame.
Step S12: the difference asking for the gray scale voltage value of corresponding same pixel in last data frame and current data frame.
In step s 12, when step S11 judges that the gray scale voltage value of corresponding same pixel in current data frame and last data frame changes, also when namely liquid crystal display prepares to switch display frame, then the difference of the gray scale voltage value of corresponding same pixel in last data frame and current data frame is asked for.
Step S13: judge whether difference is greater than zero, if be greater than zero, then performs step S14, otherwise performs step S17;
In step s 13, judge that the object whether difference is greater than zero is to judge whether display frame is switched to low GTG by high gray, wherein, when difference is greater than zero, then illustrate that display frame is switched to low GTG by high gray, now, if the same still frame that the display frame of liquid crystal display presents the long period makes Flicker value larger, then when picture switches, there will be serious ImageSticking phenomenon.
Step S14: judge whether the frame number that Frame remains unchanged is greater than the first predetermined value and is less than the second predetermined value, if so, performs step S15, if not, performs step S17.
Namely in step S14, when step S12 judges difference to be greater than zero also display frame is switched to low GTG by high gray, judge whether the frame number that current data frame remains unchanged is greater than the first predetermined value and is less than the second predetermined value further.Judge whether frame number that current data frame remains unchanged is greater than the first predetermined value and the object being less than the second predetermined value is to judge the time interval whether time that the frame number of the Frame remained unchanged continues appears at Flicker value and become large.
Step S15: reduce the gray scale voltage value of each pixel in current data frame and export pixel drive unit to.
In step S15, when step S14 judges that the frame number of current data frame is greater than the first predetermined value and is less than the second predetermined value, then reduce the gray scale voltage value of each pixel in current data frame and export pixel drive unit to, to reduce the image residue caused because stray capacitance produces feed-trough voltage in pixel drive unit.
Please also refer to Fig. 4, Fig. 4 be reduce in Fig. 3 each pixel in current data frame gray scale voltage value and export the process flow diagram of pixel drive unit to.As shown in Figure 4, reduce the gray scale voltage value of each pixel in current data frame and export pixel drive unit to and specifically comprise the steps:
Step S151: obtain the single order data processing value corresponding with the frame number that Frame remains unchanged by lookup table mode.
In step S151, the corresponding relation of the frame number that Frame remains unchanged and single order data processing value draws according to the Flicker value changing condition changed in time as shown in Figure 2 of the display frame of liquid crystal display.Wherein, the Flicker value of display frame changed along with the time, usually a stationary value is reached after a few hours, and the frame number that Frame the remains unchanged actual Flicker of being exactly value to change corresponding time value along with the time, therefore, there is corresponding relation in the Flicker value of the frame number that remains unchanged of Frame and display frame.And single order data processing value along with the change of the drift value of Flicker value large and become large, wherein, drift value is the Flicker value of the display frame of liquid crystal display and the difference of minimum Flicker value, and therefore, the Flicker value of single order data processing value and display frame exists corresponding relation.In sum, the frame number that Frame remains unchanged can set up corresponding relation by the Flicker value of display frame and single order data processing value.
In the present embodiment, minimum Flicker value is in the process measured the Flicker value of predetermined gray scale voltage (gray scale voltage that such as 128 GTGs are corresponding), Flicker value corresponding when the size of adjustment public electrode voltages makes Flicker value reach minimum value.Wherein, as shown in Figure 2, minimum Flicker value is Flicker value corresponding when the time is zero also 7.Those skilled in the art will appreciate that minimum Flicker value is 7 be only citing, the present invention is not as limit.
The schematic diagram of the frame number remained unchanged please also refer to Fig. 5, Fig. 5 Frame that is the embodiment of the present invention and the corresponding relation of single order data processing value.As shown in Figure 5, n axle represents the frame number that Frame remains unchanged, and m axle represents single order data processing value, and n0 represents the first predetermined value, and n1 represents the second predetermined value.Specifically, just exist when the frame number that single order data processing value only remains unchanged in current data frame is greater than the first predetermined value n0 and is less than the second predetermined value n1, wherein, first predetermined value n0 be Flicker value corresponding to the display frame of liquid crystal display from minimum Flicker value drift to predetermined Flicker value time corresponding Frame frame number, the second predetermined value n1 is the frame number of the Frame corresponding when drifting to predetermined Flicker value of Flicker value second time.
Fig. 2 please be refer again to, suppose that predetermined Flicker value is 8, wherein, minimum Flicker value is Flicker value corresponding when the time is zero also 7, then namely the first predetermined value n0 also 7 changes to the time of predetermined Flicker value also namely corresponding to 8 for test obtains Flicker value from minimum Flicker value, wherein, this time represents with the frame number of Frame; Second predetermined value n1 changes to the time of predetermined Flicker value also namely corresponding to 8 for testing the Flicker value second time obtained, and wherein, this time represents with the frame number of Frame.
It will be appreciated by those skilled in the art that, in actual applications, Flicker value possibly cannot change to predetermined Flicker value for the second time, now, the value of the second predetermined value n1 is infinitely great, also namely need not judge whether the frame number that current data frame remains unchanged is less than the second predetermined value n1.
Those skilled in the art will appreciate that the corresponding relation shown in Fig. 5 is only citing, the processing procedure of the concrete numerical value of single order data processing value and the driving voltage of product, liquid crystal property, product is related, the present invention not with the corresponding relation shown in Fig. 5 for restriction.
Wherein, after the frame number remained unchanged when Frame and the corresponding relation of single order data processing value are set up, then this corresponding relation is stored in the storer of liquid crystal display in table form, during follow-up use, namely obtain the single order data processing value corresponding with the frame number that current data frame remains unchanged by lookup table mode.
Step S152: by each coefficient of first order that the mode of tabling look-up is corresponding with each difference.
In step S152, coefficient of first order along with the change of difference large and become large, the span of coefficient of first order is preferably greater than 0 and is less than 1.Please also refer to the schematic diagram that Fig. 6, Fig. 6 are the difference of the embodiment of the present invention and the corresponding relation of coefficient of first order.As shown in Figure 6, c-axis represents difference, and j axle represents coefficient of first order, wherein, coefficient of first order and difference linear.Those skilled in the art will appreciate that the corresponding relation shown in Fig. 6 is only citing, the concrete numerical value of coefficient of first order has certain difference according to the changing condition of Flicker value, the difference of liquid crystal property, the present invention not with the corresponding relation shown in Fig. 6 for restriction.
Wherein, after the corresponding relation of difference and coefficient of first order is set up, then this corresponding relation is stored in the storer of liquid crystal display in table form, during follow-up use, namely obtains the coefficient of first order corresponding with each difference by lookup table mode.
Step S153: the product obtaining single order data processing value corresponding to each pixel of current data frame and coefficient of first order.
In step S153, from Fig. 5 and Fig. 6, the single order data processing value of each pixel of current data frame is identical, and coefficient of first order is incomplete same.
Step S154: obtain the difference between the gray scale voltage value of each pixel of current data frame and corresponding product and export pixel drive unit to.
In step S154, a certain pixel exports the gray scale voltage of pixel drive unit to according to following formulae discovery:
d2＝d1-m×j；
Wherein, d2 is the gray scale voltage that a certain pixel exports pixel drive unit to, d1 is the gray scale voltage of this pixel of current data frame, m is the single order data processing value that frame number that current data frame remains unchanged is corresponding, and j is coefficient of first order corresponding to the difference of the gray scale voltage of this pixel of last data frame and current data frame.
In step S154, the Flicker value according to liquid crystal display reduces the gray scale voltage value of each pixel in current data frame and exports pixel drive unit to, thus can reach reduction direct current residual effect, and then reduces the object of ImageSticking phenomenon.Wherein, each pixel is the pixel that gray scale voltage value changes, and the pixel that gray scale voltage value does not change then exports pixel drive unit to according to original value.
Step S16: the Frame remained unchanged is counted to obtain the frame number that Frame remains unchanged, continues to perform step S10.
In step s 16, when step S11 judges that the gray scale voltage value of corresponding same pixel in current data frame and last data frame does not change, do not change the carrying out of the Frame also namely remained unchanged of gray scale voltage is counted and stored, thus can know that namely frame number that Frame remains unchanged also keeps the frame number of same still frame.
Step S17: export the gray scale voltage value of pixel each in current data frame to pixel drive unit.
In step S17, namely when step S13 judges difference to be less than or equal to zero also display frame is switched to high gray by low GTG or is remained unchanged, or when the frame number that remains unchanged of Frame before step S14 judges be less than the first predetermined value or be greater than Flicker value corresponding to frame number that namely the second predetermined value also remain unchanged less time, then do not need to process the gray scale voltage value of pixel each in current data frame, but directly export pixel drive unit to.
Be described with a specific embodiment below, suppose that the Frame of current display is as follows:
Wherein, the gray scale voltage value of a pixel in each digitized representation Frame.
If detect, the gray scale voltage value of each pixel in Frame remains unchanged for a long time, and the Frame of current display needs to be switched to be switched Frame.
To be switched Frame is as follows:
Now, if do not carry out process of the present invention, due to ImageSticking phenomenon, the Frame that liquid crystal display shows is as follows:
Now, if carry out process of the present invention, then the Frame exported after process is as follows:
Treated Frame superposes with residual image, then Frame liquid crystal display shown is close to be switched Frame, and display effect is close to desired value.
Fig. 7 is the structural representation of the device reducing image residue in the liquid crystal display of the embodiment of the present invention.As shown in Figure 7, this device comprises: acquiring unit 10, and the first judging unit 20, difference ask for unit 30, counting unit 40, second judging unit 50, the 3rd judging unit 60, processing unit 70.
Acquiring unit 10 is for obtaining the gray scale voltage value of each pixel in current data frame.
First judging unit 20 is for judging whether the gray scale voltage value of corresponding same pixel in current data frame and last data frame changes.
Difference is asked for unit 30 and is connected with the first judging unit 20, for when the first judging unit 20 judges that the gray scale voltage value of corresponding same pixel in current data frame and last data frame changes, ask for the difference of the gray scale voltage value of corresponding same pixel in last data frame and current data frame.
Counting unit 40 is connected with the first judging unit 20, for when the first judging unit 20 judges that the gray scale voltage value of corresponding same pixel in current data frame and last data frame does not change, the Frame remained unchanged is counted to obtain the frame number that Frame remains unchanged.
Second judging unit 50 and difference are asked for unit 30 and are connected, for judging that difference is asked for the difference that unit 30 asks for and whether is greater than zero.
3rd judging unit 60 is connected with the second judging unit 50 and counting unit 40 respectively, for when the second judging unit 50 judges that difference is greater than zero, judge whether the frame number that the current data frame that counting unit 40 obtains remains unchanged is greater than the first predetermined value and is less than the second predetermined value further.Wherein, the first predetermined value is the frame number of the Frame corresponding when drifting to predetermined flicker value from minimum flicker value of flicker value corresponding to liquid crystal display, and the second predetermined value is the frame number of the Frame corresponding when drifting to predetermined flicker of flicker value second time.Wherein, minimum flicker value is in the process measured the flicker value of predetermined gray scale voltage, flicker value corresponding when the size of adjustment public electrode voltages makes flicker value reach minimum value.
Processing unit 70 is connected with the 3rd judging unit 60, for when the 3rd judging unit 60 judges that frame number is greater than the first predetermined value and is less than the second predetermined value, reduce the gray scale voltage value of each pixel in current data frame and export pixel drive unit to, to reduce the image residue caused because stray capacitance produces feed-trough voltage in pixel drive unit.
In the present embodiment, processing unit 70 reduces the gray scale voltage value of each pixel in current data frame and the operation exporting pixel drive unit to is specially: processing unit 70 obtains the single order data processing value corresponding with the frame number that current data frame remains unchanged by lookup table mode, wherein, single order data processing value along with the change of the drift value of flicker value large and become large, drift value is the flicker value of the display frame of liquid crystal display and the difference of minimum flicker value.Processing unit 70 obtains each coefficient of first order corresponding with each difference by lookup table mode, wherein, coefficient of first order along with the change of difference large and become greatly, the span of coefficient of first order is for being greater than 0 and being less than 1.Processing unit 70 obtains the product of single order data processing value corresponding to each pixel of current data frame and coefficient of first order.Processing unit 70 obtains the difference between the gray scale voltage value of each pixel of current data frame and corresponding product and exports pixel drive unit to.
The invention has the beneficial effects as follows: when the method for reduction image residue of the present invention and liquid crystal display are by detecting that the gray scale voltage value of corresponding same pixel in current data frame and last data frame changes, if the difference of the gray scale voltage value of corresponding same pixel is greater than zero and the frame number that Frame remains unchanged is greater than the first predetermined value and is less than the second predetermined value in last data frame and current data frame, then the gray scale voltage value reduced in current data frame also exports pixel drive unit to.By the way, the present invention reduces the gray scale voltage value of each pixel in current data frame according to the Flicker value of liquid crystal display and exports pixel drive unit to, Frame after reducing gray scale voltage is superposed with image residual in liquid crystal display, make the Frame that liquid crystal display shows close to anticipatory data frame, thus the image residue caused because stray capacitance produces feed-trough voltage in pixel drive unit can be reduced, improve the display quality of picture.
The foregoing is only embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize instructions of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. reduce a method for image residue, it is characterized in that, described method comprises:
Obtain the gray scale voltage value of each pixel in current data frame;
Judge whether the gray scale voltage value of corresponding same pixel in current data frame and last data frame changes;
If change, then ask for the difference of the described gray scale voltage value of corresponding same pixel in described last data frame and described current data frame, if do not change, then the Frame remained unchanged counted to obtain frame number that Frame remains unchanged and continue the step of the gray scale voltage value performing each pixel in described acquisition current data frame;
Judge whether described difference is greater than zero;
If described difference is greater than zero, judge whether the described frame number that described Frame remains unchanged is greater than the first predetermined value and is less than the second predetermined value further;
If described frame number is greater than the first predetermined value and be less than the second predetermined value, then reduce the described gray scale voltage value of each pixel in described current data frame and export pixel drive unit to, to reduce the image residue caused because stray capacitance produces feed-trough voltage in described pixel drive unit.
2. method according to claim 1, is characterized in that, the described gray scale voltage value of each pixel in the described current data frame of described reduction the step exporting pixel drive unit to comprise:
The single order data processing value corresponding with the described frame number that described Frame remains unchanged is obtained by lookup table mode;
The each coefficient of first order corresponding with each described difference is obtained by lookup table mode;
Obtain the product of described single order data processing value corresponding to each pixel of described current data frame and described coefficient of first order;
Obtain the difference between the gray scale voltage value of each pixel of described current data frame and corresponding described product and export pixel drive unit to.
3. method according to claim 2, is characterized in that, described coefficient of first order along with the change of described difference large and become large.
4. method according to claim 3, is characterized in that, the span of described coefficient of first order is for being greater than 0 and being less than 1.
5. method according to claim 2, is characterized in that, described single order data processing value along with the change of the drift value of flicker value large and become large, described drift value is the difference of flicker value corresponding to liquid crystal display and minimum flicker value.
6. method according to claim 5, it is characterized in that, described first predetermined value is the frame number of the Frame corresponding when drifting to predetermined flicker value from described minimum flicker value of described flicker value corresponding to liquid crystal display, and described second predetermined value is the frame number of the Frame corresponding when drifting to described predetermined flicker of described flicker value second time.
7. method according to claim 6, it is characterized in that, described minimum flicker value is in the process measured the described flicker value of predetermined gray scale voltage, described flicker value corresponding when the size of adjustment public electrode voltages makes described flicker value reach minimum value.
8. a liquid crystal display, is characterized in that, described liquid crystal display comprises the device reducing image residue, and described device comprises:
Acquiring unit, for obtaining the gray scale voltage value of each pixel in current data frame;
First judging unit, for judging whether the gray scale voltage value of corresponding same pixel in current data frame and last data frame changes;
Difference asks for unit, during for judging that the described gray scale voltage value of corresponding same pixel in described current data frame and described last data frame changes when described first judging unit, ask for the difference of the described gray scale voltage value of corresponding same pixel in described last data frame and described current data frame;
Counting unit, when judging that the described gray scale voltage value of corresponding same pixel in described current data frame and described last data frame does not change for described first judging unit, the Frame remained unchanged is counted to obtain the frame number that Frame remains unchanged;
Second judging unit, for judging that described difference is asked for the described difference that unit asks for and whether is greater than zero;
3rd judging unit, for when described second judging unit judges that described difference is greater than zero, judges whether the described frame number that described Frame remains unchanged is greater than the first predetermined value and is less than the second predetermined value further;
Processing unit, for when described 3rd judging unit judges that described frame number is greater than the first predetermined value and is less than the second predetermined value, reduce the described gray scale voltage value of each pixel in described current data frame and export pixel drive unit to, to reduce the image residue caused because stray capacitance produces feed-trough voltage in described pixel drive unit.
9. liquid crystal display according to claim 8, is characterized in that, described processing unit reduces the described gray scale voltage value of each pixel in described current data frame and the operation exporting pixel drive unit to is specially:
Described processing unit obtains the single order data processing value corresponding with the described frame number that described Frame remains unchanged by lookup table mode; Described processing unit obtains each coefficient of first order corresponding with each described difference by lookup table mode; Described processing unit obtains the product of described single order data processing value corresponding to each pixel of described current data frame and described coefficient of first order; Described processing unit obtains the difference between the gray scale voltage value of each pixel of described current data frame and corresponding described product and exports pixel drive unit to.
10. liquid crystal display according to claim 9, it is characterized in that, described first predetermined value is the frame number of the Frame corresponding when drifting to predetermined flicker value from minimum flicker value of flicker value corresponding to liquid crystal display, and described second predetermined value is the frame number of the Frame corresponding when drifting to described predetermined flicker of described flicker value second time.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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