CN101546540B - Grey insertion method and drive circuit for LCD display - Google Patents
Grey insertion method and drive circuit for LCD display Download PDFInfo
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- CN101546540B CN101546540B CN2009101070231A CN200910107023A CN101546540B CN 101546540 B CN101546540 B CN 101546540B CN 2009101070231 A CN2009101070231 A CN 2009101070231A CN 200910107023 A CN200910107023 A CN 200910107023A CN 101546540 B CN101546540 B CN 101546540B
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Abstract
The invention is applied in the technical field of LCD display, and provides a grey insertion method and a drive circuit for the LCD display, wherein the method comprises the following steps of: judging that the LCD display displays a dynamic frame or static frame; when the LCD display displays the dynamic frame, improving the extent of the grey insertion of the frame displayed by the LCD display, and synchronously prolonging a working cycle of a pulse width modulation signal, wherein the pulse width modulation signal is used for driving a backlight module of the LCD display; and when the LCD display displays the static frame, reducing the extent of the grey insertion of the frame displayed by the LCD display, and synchronously shortening the working cycle of the pulse width modulation signal. Because a frame detector is used to judge that a second frame displayed by the LCD display is the dynamic frame or static frame, the increase or decrease of the extent of the grey insertion of the frame is determined, and the working cycle of the pulse width modulation signal is synchronously prolonged or shortened, the method and the drive circuit can be suitably used for adjusting the extent of the grey insertion of the frame, synchronously adjusting the brightness of the backlight, and improving the dynamic fuzzy problem of the dynamic frame.
Description
Technical field
The invention belongs to the LCD Technology field, relate in particular to a kind of grey insertion method and driving circuit of LCD.
Background technology
(Liquid Crystal Display LCD) is the display mode that adopts freeze mode (Hold-type) to LCD, so LCD can produce the phenomenon of image fog when showing dynamic menu.Generally speaking, prior art can adopt Plug Grey (Gray Insertion) technology, to reduce the situation of dynamic fuzzy (Motion Blur).How following elder generation drives with regard to the LCD panel is done simple the description.
LCD panel driving signal mainly is divided into two partly, a data-signal that is provided for source electrode driver (Source Driver), and another is the sweep signal that gate pole driver (Gate Driver) is provided.Data-signal mainly provides each pixel gray level pairing voltage signal.Sweep signal is in order to control the switching signal of each row pixel voltage input, and sweep signal is for pursuing column scan.Usually, each pixel constitutes with a thin film transistor (TFT), and wherein thin film transistor (TFT) has gate, source electrode and drain.In order to the control TFT conducting whether sweep signal.When the thin film transistor (TFT) conducting, data-signal can see through thin film transistor (TFT) pixel storage capacitor is charged.
The LCD panel that Figure 1A provides for prior art shows the synoptic diagram of the sweep signal of normal pictures.Please refer to Figure 1A, when sweep signal Gate 01～Gate N is high logic standard position, the thin film transistor (TFT) conducting, data-signal can see through thin film transistor (TFT) and charge to pixel storage capacitor, thereby shows normal pictures.
The LCD panel that Figure 1B provides for prior art shows the synoptic diagram of the sweep signal of normal pictures and Plug Grey picture.After the Plug Grey function was opened, a picture (Frame) can be divided into two parts, and one is a normal pictures 101, and another is a Plug Grey picture 102.In Plug Grey picture 102, sweep signal Gate 01～Gate N fixed in the time of the accurate position of high logic.
What deserves to be mentioned is,, picture brightness is declined to a great extent though the Plug Grey technology can be improved the problem of the dynamic fuzzy of dynamic menu.LCD is showing tableaux, and when for example being photo or text screen, the situation that does not have dynamic fuzzy occurs.This moment, LCD was if use the Plug Grey technology, can cause picture contrast not good.
Therefore, LCD is when showing tableaux, and prior art can see through manual type the Plug Grey function of LCD is closed.Yet when the Plug Grey function was opened or closed, the brightness difference in change out-phase of display frame caused the discomfort of human eye easily when big.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of grey insertion method of LCD, and when being intended to solve available liquid crystal and being presented at the Plug Grey function and opening or close, the brightness difference in change out-phase of display frame cause the problem of the discomfort of human eye when big.
The embodiment of the invention is achieved in that a kind of grey insertion method of LCD, said method comprising the steps of:
Judge dynamic picture frame of liquid crystal display displays or static picture frame;
When the dynamic picture frame of described liquid crystal display displays, increase the demonstration time of a Plug Grey picture in a picture cycle, and amplitude according to the time increase, increase the work period of a pulse-width modulation signal to scale synchronously, wherein said pulse-width modulation signal is in order to drive described backlight liquid crystal display module;
When the static picture frame of described liquid crystal display displays, reduce the demonstration time of this Plug Grey picture, and, reduce the work period of described pulse-width modulation signal to scale synchronously according to the amplitude of the minimizing of time in this picture cycle.
Another purpose of the embodiment of the invention is to provide a kind of driving circuit, is applicable to LCD, and described driving circuit comprises:
The picture frame detector is used for judging that according to previous first picture frame and the second received picture frame of described LCD that shows of LCD described second picture frame is dynamic picture frame or static picture frame;
The Plug Grey controller connects described picture frame detector; And
The backlight compensation unit connects described picture frame detector;
Wherein, when described second picture frame is dynamic picture frame, described Plug Grey controller increases the demonstration time of a Plug Grey picture in a picture cycle, and the amplitude that described backlight compensation unit increased according to the time, increase the work period of a pulse-width modulation signal to scale synchronously, when described second picture frame is static picture frame, described Plug Grey controller reduces the demonstration time of this Plug Grey picture in this picture cycle, and described backlight compensation unit is according to the amplitude of the minimizing of time, reduce the work period of described pulse-width modulation signal to scale synchronously, wherein said pulse-width modulation signal is in order to drive described backlight liquid crystal display module.
The embodiment of the invention judges that by the picture frame detector the second shown picture frame of LCD is dynamic picture frame or static picture frame, improves or reduce the degree of picture frame Plug Grey with decision, and increases or reduce the work period of pulse-width modulation signal synchronously.Therefore the degree of energy accommodation picture frame Plug Grey reaches and adjusts brightness backlight synchronously, can not only improve the dynamic fuzzy problem of dynamic picture frame, also can improve static picture frame and cause the serious distortion of brightness because of the Plug Grey technology.
Description of drawings
The LCD panel that Figure 1A provides for prior art shows the synoptic diagram of the sweep signal of normal pictures;
The LCD panel that Figure 1B provides for prior art shows the synoptic diagram of the sweep signal of normal pictures and Plug Grey picture;
Fig. 1 C is a kind of synoptic diagram of adjusting picture frame Plug Grey degree with picture according to one embodiment of the invention;
Fig. 2 is the calcspar according to the LCD of one embodiment of the invention;
Fig. 3 is the process flow diagram according to the grey insertion method of a kind of LCD of one embodiment of the invention;
Fig. 4 A and Fig. 4 B are the synoptic diagram of a kind of first picture frame and second picture frame;
Fig. 5 is the process flow diagram of a kind of embodiment of step S301;
Fig. 6 is the process flow diagram of the another kind of embodiment of step S301;
Fig. 7 is the calcspar according to the LCD of another embodiment of the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The Plug Grey technology that prior art provides though can improve the situation of the dynamic fuzzy of dynamic menu, can make the brightness of dynamic menu and tableaux decline to a great extent.In addition, in the prior art, when the Plug Grey function was opened or closed, display frame brightness difference in change out-phase caused the discomfort of human eye easily when big.
In view of this, embodiments of the invention provide the grey insertion method of a kind of LCD.The method can be judged dynamic picture frame of liquid crystal display displays or static picture frame.When the dynamic picture frame of liquid crystal display displays, can improve the degree of LCD picture frame Plug Grey, and (Pulse Width Modulate PWM) work period of signal (Duty Cycle), uses the situation of improving dynamic fuzzy to increase pulse-width modulation synchronously.Otherwise, when the static picture frame of liquid crystal display displays, can reduce the degree of LCD picture frame Plug Grey, and the work period of reducing the pulse-width modulation signal synchronously, use the situation of film flicker when avoiding showing static picture frame.
Wherein, above-mentioned pulse-width modulation signal week is to drive the backlight liquid crystal display module.In addition, the work period of above-mentioned synchronous adjustment pulse-width modulation signal, can be when the Plug Grey picture produce, the brightness of picture is compensated.Simultaneously, it is excessive to avoid display frame to cause brightness to change difference when producing the Plug Grey picture, the discomfort of the human eye that causes.Elaborate embodiments of the invention below with reference to the accompanying drawings, accompanying drawing is for example understood example embodiment of the present invention, wherein same or similar assembly or the step of same numeral indication.
Fig. 1 C is a kind of synoptic diagram of adjusting picture frame Plug Grey degree with picture according to one embodiment of the invention.Please refer to Fig. 1 C, the grey insertion method of present embodiment can be judged dynamic picture frame of present liquid crystal display displays or static picture frame.When the dynamic picture frame of liquid crystal display displays, can increase the Plug Grey picture in the demonstration time in a picture (Frame) cycle, and increase the work period of pulse-width modulation signal synchronously.That is to say, in sweep signal Gate 01～Gate N, increase the pulse G that writes the black plug data writes the pulse P of pixel data to the next one time.And, according to the amplitude that the time increases, increase the work period of pulse-width modulation signal to scale, wherein the work period is the ratio in pulsewidth and cycle.So can improve the degree of dynamic picture frame Plug Grey, improve the problem of dynamic fuzzy, and the brightness that keeps picture to show.Wherein the Plug Grey picture is written in the display panel at Gate 01～Gate N consecutive pulses G.
When liquid crystal display displays static state picture frame, can reduce the demonstration time of Plug Grey picture, and reduce the work period of pulse-width modulation signal synchronously in picture cycle.That is to say, can reduce the pulse G that writes the Plug Grey data writes the pulse P of pixel data to the next one time (T12 for example) among sweep signal Gate 01～Gate N.And,, reduce the work period of pulse-width modulation signal to scale according to the amplitude of time decreased.Therefore, can reduce the degree of LCD picture frame Plug Grey, avoid the tableaux flicker, and keep the brightness that picture shows.
In addition, adjust the degree of picture frame Plug Grey, the duration of charging that also can see through adjustment Plug Grey picture 102 realizes.That is to say, when the dynamic picture frame of liquid crystal display displays, increase the time of the pulse G of sweep signal Gate 01～Gate N in the accurate position of high logic.When liquid crystal display displays static state picture frame, reduce the time of the pulse G of sweep signal Gate 01～Gate N in the accurate position of high logic.It must be noted that in a picture cycle, each pulse (comprising the pulse G that writes the Plug Grey data and the pulse P of pixel data) corresponds to respectively among output enable (Output Enable) the signal OE during the difference.And, the time that each pulse is in the accurate position of high logic depend on the corresponding output enable signal of institute during, its output enable signal OE is in the time of accurate of low logic.
Fig. 2 is the calcspar according to the LCD of one embodiment of the invention.Please refer to Fig. 2, in the present embodiment, LCD 10 can comprise display panel (displaypanel) 20, gate pole driver (gate driver) 30, source electrode driver (source driver) 40, backlight module (back light module) 50 and driving circuit 200.Driving circuit 200 receiving video data (for example second picture frame), and, use driving display panel 20 demonstration video signal datas according to pixel data control grid driver 30, source electrode driver 40, backlight module 50 in second picture frame.
In driving circuit 200, it comprises picture frame detector 210, Plug Grey controller 220, backlight compensation unit 230 and picture frame buffer (Frame Buffer) 240.Picture frame detector 210 receiving video data (for example second picture frame), and connect Plug Grey controller 220 and backlight compensation unit 230.Plug Grey controller 220 connects gate pole driver 30 and source electrode driver 40.Backlight compensation unit 230 connects backlight module 50.Picture frame buffer 240 receives and stores video signal data.
Fig. 3 is the process flow diagram according to the grey insertion method of a kind of LCD of one embodiment of the invention.Fig. 4 A and Fig. 4 B are the synoptic diagram of a kind of first picture frame and second picture frame.Please merge 2～Fig. 4 with reference to figure, suppose that first picture frame and second picture frame are continuous picture frame, wherein first picture frame and second picture frame all comprise mountain 410 and YIDUOYUN 420, and that first picture frame and second picture frame different are in the position of cloud 420 is different.In addition, suppose that picture frame detector 210 and picture frame buffer 240 have stored first picture frame.When driving circuit 200 received second picture frame, picture frame buffer 240 can store second picture frame.And picture frame detector 210 can judge that second picture frame is dynamic picture frame or static picture frame according to first picture frame, that is judges that LCD 10 second picture frame next to display is dynamic picture frame or static picture frame (step S301).As the dynamic picture frame of liquid crystal display displays, then execution in step S302.As liquid crystal display displays static picture frame, then execution in step S303.Below provide a kind of embodiment of step 301 to consider and examine for haveing the knack of this area person.
Fig. 5 is the process flow diagram of a kind of embodiment of step S301.Please merge with reference to Fig. 2～Fig. 5, step S301 for example can comprise step S501～S504 in the present embodiment.At first can shown in step S501, produce difference value according to first picture frame and second picture frame.Whether for instance, can compare first picture frame respectively mutually the same with each corresponding block of second picture frame.Then, the quantity that differs from one another according to each corresponding block again produces difference value.
More particularly, in the present embodiment, whether the block 1 that picture frame detector 210 can compare first picture frame earlier is identical with the block 1 of second picture frame, then do not count as if identical; If inequality then the counting with the accumulated counts value.In the present embodiment, the block 1 of picture frame is inequality with the block 1 of present picture frame, so count value becomes 1 by 0.By that analogy, relatively whether the block 2～9 of first picture frame is identical with the block 2～9 of first picture frame respectively again for picture frame detector 210.In the present embodiment, the block 2,4,5 of the block 2,4,5 of picture frame and present picture frame is inequality, so after the block 2～9 of the block 2～9 of relatively intacter first picture frame of picture frame detector 210 and second picture frame, its count value can become 4.Note that in the present embodiment that at this count value can be directly as above-mentioned difference value, but the present invention is not as limit.Count value also can be indirectly as above-mentioned difference value in other embodiments.
But whether subsequent steps S502 after obtaining difference value, picture frame detector 210 can differentiate difference value greater than setting value, if greater than judging that then LCD 10 shows dynamic picture frame (step S503); Otherwise, then judge the dynamic picture frame of LCD 10 non-demonstrations, also promptly show static picture frame (step S504).In the present embodiment, setting value is that example describes with 4, so difference value is less than or equal to setting value, and picture frame detector 210 judges that present picture frame is static picture frame, and reduces the demonstration time of Plug Grey picture in picture cycle according to this.Note that at this present embodiment utilizes step S501～S504 to come the benefit of implementation step S301 to be, can avoid picture frame to be judged as dynamic picture frame because of changing slightly.And in other embodiments, picture frame detector 210 can comprise or connect storage element (not shown) and counter (not shown), to realize the function of above-mentioned storage and counting respectively.
Because picture frame is judged as static picture frame at step S301 at present, therefore continue execution in step S303, reduce the degree of LCD 10 picture frame Plug Greys, and reduce the work period of pulse-width modulation signal synchronously.Wherein, the degree that reduces LCD 10 picture frame Plug Greys can be finished in the demonstration time of picture cycle through reducing the Plug Grey picture.Please merge with reference to Fig. 1 C, Fig. 2～Fig. 5, at step S303, Plug Grey controller 220 can reduce Plug Grey picture among Fig. 1 C the demonstration time (as during T12).In a picture cycle, when enabling signal STV transmits pulse for the first time, gate pole driver 30 can produce in order to write the pulse P of pixel data at sweep signal Gate 01, and this pulse P can the displacement according to the time, make pulse P and to appear at sweep signal Gate 02, and the pulse P of sweep signal Gate 03～Gate N can be learnt by above-mentioned analogizing in sweep signal Gate 01 disappearance.
And enabling signal STV is when transmitting pulse for the second time, gate pole driver 30 can produce in order to write the pulse G of Plug Grey data at sweep signal Gate 01, and pulse G can be similar to pulse P, and the displacement according to the time is to produce pulse G at sweep signal Gate 02～Gate N.According to above-mentioned because picture cycle is for fixing, so as long as increase enabling signal STV in a picture cycle for the first time and transmit for the second time pulse spacing (as during T11), just can reduce the demonstration time T 12 of Plug Grey picture.And in the present embodiment, can so just can stop the generation of Plug Grey picture as long as transmit pulsatile once in a picture cycle.
For instance, when the liquid crystal display displays tableaux, during T12 can shorten to zero by 1/3rd of picture cycle, and the work period can change into 60% by 80%.Thus, can improve the problem that LCD shows the flicker of static picture frame.In addition, also can avoid the switching of Plug Grey function to make the picture brightness change excessive, and then cause the human eye discomfort.
In addition, reduce the degree of LCD 10 picture frame Plug Greys and also can finish, also promptly reduce the time of pulse G in the accurate position of high logic through the duration of charging that shortens the Plug Grey picture.According to above-mentioned, as long as in during pulse G institute is corresponding to output enable signal OE, shorten the time of output enable signal OE accurate of low logic, just can reduce the duration of charging of Plug Grey picture.For instance, in during correspondence, as output enable signal OE during all in the accurate position of high logic, then the duration of charging of Plug Grey picture hypothesis by two/change vanishing, also promptly can not produce the Plug Grey picture, and the work period of pulse-width modulation signal can change into 50% by 80%.
In like manner can analogize,, then continue step S302, improve the degree of LCD picture frame Plug Grey, and increase the work period of pulse-width modulation signal synchronously if picture frame is judged as dynamic picture frame at step S301 at present.Adjusting the Plug Grey picture, as long as T11 during reducing, just can increase the demonstration time T 12 of Plug Grey picture in the demonstration time of picture cycle.In other words, when the liquid crystal display displays dynamic menu, during T12 can increase to 1/3rd of picture cycle by zero, and the work period can change into 80% by 60%.To adjust the duration of charging of Plug Grey picture, as long as in during pulse G institute is corresponding to output enable signal OE, prolong the time of output enable signal OE accurate of low logic, just can prolong the duration of charging of Plug Grey picture.
That is to say, in during correspondence, when output enable signal OE had time of 1/2nd in the accurate position of low logic, then the duration of charging of Plug Grey picture can be changed into 1/2nd during its correspondence by zero, and the work period of pulse-width modulation signal can change into 80% by 50%.Thus, can improve the problem that LCD shows the dynamic fuzzy of dynamic picture frame.Also can avoid in addition because of picture carries out Plug Grey, make picture brightness change excessive and then cause the human eye discomfort.
Need especially one carry be, after the degree of adjusting the picture frame Plug Grey, have the knack of art technology person and can adopt various picture scan mode according to its demand, use and present the Plug Grey picture.For instance, driving circuit 200 can cooperate by column scan (Raster Scanning) mode and show the Plug Grey picture in the present embodiment.But in other embodiments, also can adopt staggered column scan (Interlace Scanning) mode or other scan mode to show the Plug Grey picture, the present invention is not as limit.
Referring again to Fig. 5, in the above-described embodiments, step S501 is whether comparison first picture frame is mutually the same with 9 corresponding blocks of second picture frame, use the generation difference value, but the present invention is not as limit.In other embodiments, have the knack of art technology person and also can adopt the corresponding block of other quantity to replace above-mentioned 9 corresponding blocks, use the generation difference value according to its demand.So also can reach the effect similar with the foregoing description.Along with the increase of corresponding number of blocks, the degree of accuracy of differentiating present picture frame and whether the be dynamic picture frame height of also can healing.
Though LCD and grey insertion method thereof have been depicted a possible kenel in the foregoing description, usually know that the knowledgeable should know but have in the affiliated technical field, each manufacturer is all different for the design of LCD and grey insertion method thereof, and therefore application of the present invention is when being not restricted to the possible kenel of this kind.In other words, so long as judge dynamic picture frame of liquid crystal display displays or static picture frame, using the degree that improves or reduce the picture frame Plug Grey, and increase or reduce the work period of pulse-width modulation signal synchronously, has been to have met spiritual place of the present invention just.Below lift several embodiments again and know that usually the knowledgeable can further understand spirit of the present invention, and implement the present invention so that this area has.
In addition, in the foregoing description, the step S501 that Fig. 5 disclosed～S504 only is a kind of selection embodiment of step S301, and the present invention is not as limit.In other embodiments, haveing the knack of art technology person also can adopt alternate manner to judge dynamic picture frame of liquid crystal display displays or static picture frame (step S301).Whether for instance, it is identical with second picture frame directly to compare first picture frame, if identically then can assert the static picture frame of liquid crystal display displays; Otherwise, if inequalityly then can assert the dynamic picture frame of liquid crystal display displays.The benefit of this practice is that its computation complexity is low, and can save the step of counting.
Again for example, Fig. 6 is the process flow diagram of the another kind of embodiment of step S301.Please merge with reference to Fig. 2 and Fig. 6, step S301 for example can comprise step S601～S604 in the present embodiment.The original state of the count value of present embodiment picture frame detector 210 is 0.At first can count the continuous change frequency of many first picture frames and second picture frame by step S601.In more detail, relatively whether first picture frame is identical with second picture frame respectively for picture frame detector 210, if the identical count value of then resetting, if then accumulated counts value inequality.In the present embodiment, can be with count value as above-mentioned continuous change frequency.Suppose that at this first picture frame and second picture frame are inequality, so count value becomes 1 by 0.
Then but whether subsequent steps S602 differentiates continuous change frequency greater than setting value, if greater than the dynamic picture frame of decidable liquid crystal display displays (step S603) then; Otherwise, if be less than or equal to the then static picture frame (step S604) of decidable liquid crystal display displays.Setting value for example can be 3 in the present embodiment.Because count value is 1 to be less than or equal to setting value 3, therefore second picture frame can be judged as static picture frame, also is the static picture frame (step S604) of liquid crystal display displays.
In like manner, after driving circuit 200 receives next picture frame, can judge that LCD 10 shows dynamic picture frame or static picture frame according to above-mentioned steps S601～S604 equally.By that analogy, have the knack of art technology person and differentiate whether present picture frame is the embodiment of dynamic picture frame during each picture frame after should knowing by inference, do not repeat them here.
Note that at this present embodiment utilizes step S601～S604 to come the benefit of implementation step S301 to be, can avoid a plurality of picture frames that video signal data transmits not change between short-term and be judged as static picture frame.In addition, the picture frame detector 210 of present embodiment can only store a picture frame, and is used the information of count value with many previous pictures of indirect acquisition.Therefore, can save the storage area effectively, and not need to store many first picture frame.
Moreover in the present embodiment, though the setting value of step S602 is that example describes with 3, the present invention is not as limit.In other embodiments, have the knack of the size that art technology person can decide setting value according to its demand in its sole discretion.What deserves to be mentioned is that along with setting value is bigger, second picture frame then is judged as tableaux more easily; Otherwise along with setting value is littler, second picture frame then is judged as dynamic menu more easily.
Above-mentioned driving circuit 200 can carry out the Plug Grey (for example Gu Ding demonstration time T 12 or fixing duration of charging) of fixation degree when LCD shows dynamic picture frame.Yet, the adjustment that the picture frame Plug Grey can also be gradual, and adjust work period of pulse-width modulation signal synchronously.Fig. 7 is the calcspar according to the LCD of another embodiment of the present invention.Please refer to Fig. 2 and Fig. 7, it is greater than Plug Grey controller 710 and the backlight compensation unit 720 of difference at driving circuit 700.Backlight compensation unit 720 connects Plug Grey controller 710.When LCD 10 showed dynamic menu, Plug Grey controller 710 can improve the degree of LCD 10 picture frame Plug Greys gradually.
To adjust the Plug Grey picture in the demonstration time of picture cycle, the time of T12 during Plug Grey controller 710 can increase gradually, and output gain signal Gain are with the 720 synchronous work periods that increase the pulse-width modulation signal of control backlight compensation unit.To adjust the duration of charging of Plug Grey picture, can pulse G corresponding to output enable signal OE during in, prolong the time of output enable signal OE in the accurate position of low logic, use the duration of charging that prolongs the Plug Grey picture, and output gain signal Gain is with the 720 synchronous work periods that increase the pulse-width modulation signal of control backlight compensation unit.
In other embodiments, when the demonstration time of Plug Grey picture shows the time less than lower limit, then show the demonstration time of time as the Plug Grey picture with lower limit.Perhaps, the duration of charging of the Plug Grey picture after shortening is shorter than lower limit during the duration of charging, then with the duration of charging of lower limit duration of charging as the Plug Grey picture.Have the knack of art technology person and can set up lower limit demonstration time or lower limit duration of charging on their own according to its demand.The benefit of this practice is to make LCD can continue to show the Plug Grey picture.
When LCD 10 showed tableaux, Plug Grey controller 710 can reduce the degree of LCD 10 picture frame Plug Greys gradually.To adjust the Plug Grey picture in the demonstration time of picture cycle, the time of T12 during Plug Grey controller 710 can reduce gradually, and output gain signal Gain are with the 720 synchronous work periods that reduce the pulse-width modulation signal of control backlight compensation unit.To adjust the duration of charging of Plug Grey picture, can pulse G corresponding to output enable signal OE during in, shorten the time of output enable signal OE in the accurate position of low logic, use the duration of charging that shortens the Plug Grey picture, and output gain signal Gain is with the 720 synchronous work periods that increase the pulse-width modulation signal of control backlight compensation unit.
In addition, in other embodiments, when the demonstration time of Plug Grey picture shows the time greater than the upper limit, then show the demonstration time of time as the Plug Grey picture with the upper limit.Perhaps, the duration of charging of the Plug Grey picture after prolonging surpasses the upper limit during duration of charging, then with the duration of charging of upper limit duration of charging as the Plug Grey picture.Have the knack of art technology person and can set up upper limit demonstration time or upper limit duration of charging on their own according to its demand.The benefit of this practice is to make LCD can continue to show normal pictures.
In sum, the present invention judges that by the picture frame detector the second shown picture frame of LCD is dynamic picture frame or static picture frame, improves or reduce the degree of picture frame Plug Grey with decision, and increases or reduce the work period of pulse-width modulation signal synchronously.Therefore the degree of energy accommodation picture frame Plug Grey reaches and adjusts brightness backlight synchronously, can not only improve the dynamic fuzzy problem of dynamic picture frame, also can improve static picture frame and cause the serious distortion of brightness because of the Plug Grey technology.In addition, all embodiment of the present invention also have following effect:
1. shorten the demonstration time or the duration of charging of Plug Grey picture, can improve the problem that LCD shows the film flicker of static picture frame.
2. prolong the demonstration time or the duration of charging of Plug Grey picture, can improve the problem that LCD shows the dynamic fuzzy of dynamic picture frame.
3. adjust the work period of pulse-width modulation signal synchronously, can avoid the display frame luminance difference excessive and cause the discomfort of human eye.
4. utilize step S501～S504 to come implementation step S301, can avoid picture frame to be judged as dynamic picture frame because of changing slightly.
5. adjust the quantity of corresponding block among the step S501, can change and differentiate whether second picture frame is the degree of accuracy of dynamic picture frame.
6. whether directly more present picture frame is identical with previous picture frame, uses and differentiates whether second picture frame is dynamic picture frame, can effectively reduce computation complexity.
7. utilize step S601～S604 to come implementation step S301, can avoid picture frame not change between short-term and be judged as static picture frame.
8. among the step S602, can adjust present picture frame by the change setting value and whether be judged as dynamic menu easily.
Though the present invention discloses as above with embodiment; right its is not in order to limit the present invention; have in the technical field under any and know the knowledgeable usually; without departing from the spirit and scope of the present invention; when doing a little change and retouching, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the grey insertion method of a LCD is characterized in that, said method comprising the steps of:
Judge dynamic picture frame of liquid crystal display displays or static picture frame;
When the dynamic picture frame of described liquid crystal display displays, increase the demonstration time of a Plug Grey picture in a picture cycle, and amplitude according to the time increase, increase the work period of a pulse-width modulation signal to scale synchronously, wherein said pulse-width modulation signal is in order to drive described backlight liquid crystal display module;
When the static picture frame of described liquid crystal display displays, reduce the demonstration time of this Plug Grey picture, and, reduce the work period of described pulse-width modulation signal to scale synchronously according to the amplitude of the minimizing of time in this picture cycle.
2. the grey insertion method of LCD as claimed in claim 1 is characterized in that, the step of dynamic picture frame of described judgement liquid crystal display displays or static picture frame specifically comprises:
Previous first picture frame that shows of extract crystal display;
Extract second picture frame that described LCD shows at present;
When described first picture frame is different from described second picture frame, judge the dynamic picture frame of described liquid crystal display displays;
When described first picture frame is same as described second picture frame, judge the static picture frame of described liquid crystal display displays.
3. the grey insertion method of LCD as claimed in claim 1 is characterized in that, the step of dynamic picture frame of described judgement liquid crystal display displays or static picture frame specifically comprises:
Previous first picture frame that shows of extract crystal display;
Extract second picture frame that described LCD shows at present;
Produce a difference value according to described first picture frame and second picture frame;
When described difference value during, judge the dynamic picture frame of described liquid crystal display displays greater than a setting value; And
When described difference value is less than or equal to described setting value, judge the static picture frame of described liquid crystal display displays.
4. the grey insertion method of LCD as claimed in claim 3 is characterized in that, the step that described first picture frame of described foundation and second picture frame produce a difference value specifically comprises:
Whether a plurality of blocks of differentiating described first picture frame respectively are same as block corresponding in described second picture frame, and wherein said second picture frame has and the identical block counts of described first picture frame;
Quantity according to each corresponding block between described first picture frame and described second picture frame differs from one another determines a difference value.
5. the grey insertion method of LCD as claimed in claim 1 is characterized in that, the step of dynamic picture frame of described judgement liquid crystal display displays or static picture frame specifically comprises:
Previous a plurality of first picture frames that show of extract crystal display;
Extract second picture frame that described LCD shows at present;
Count the continuous change frequency of described first picture frame and second picture frame;
When described continuous change frequency during, judge the dynamic picture frame of described liquid crystal display displays greater than a setting value; And
When described continuous change frequency is less than or equal to described setting value, judge the static picture frame of described liquid crystal display displays.
6. the grey insertion method of LCD as claimed in claim 1 is characterized in that, the step of the degree of the described LCD picture frame of described raising Plug Grey specifically comprises:
Prolong the duration of charging of described Plug Grey picture;
The step of the degree of the described LCD picture frame of described reduction Plug Grey specifically comprises:
Shorten the duration of charging of described Plug Grey picture.
7. a driving circuit is applicable to LCD, it is characterized in that, described driving circuit comprises:
The picture frame detector is used for judging that according to previous first picture frame and the second received picture frame of described LCD that shows of LCD described second picture frame is dynamic picture frame or static picture frame;
The Plug Grey controller connects described picture frame detector; And
The backlight compensation unit connects described picture frame detector;
Wherein, when described second picture frame is dynamic picture frame, described Plug Grey controller increases the demonstration time of a Plug Grey picture in a picture cycle, and the amplitude that described backlight compensation unit increased according to the time, increase the work period of a pulse-width modulation signal to scale synchronously, when described second picture frame is static picture frame, described Plug Grey controller reduces the demonstration time of this Plug Grey picture in this picture cycle, and described backlight compensation unit is according to the amplitude of the minimizing of time, reduce the work period of described pulse-width modulation signal to scale synchronously, wherein said pulse-width modulation signal is in order to drive described backlight liquid crystal display module.
8. driving circuit as claimed in claim 7, it is characterized in that, described picture frame detector is obtained the difference value between described first picture frame and second picture frame, when described difference value during greater than a setting value, described picture frame detector judges that described second picture frame is dynamic picture frame, when described difference value was less than or equal to described setting value, it was static picture frame that described picture frame detector is declared described second picture frame;
Described picture frame detector comprises:
Counter is used for after described picture frame detector judges that described first picture frame and each corresponding block of this second picture frame be whether identical, counts the quantity that each corresponding block differs from one another between described first picture frame and this second picture frame, as described difference value.
9. driving circuit as claimed in claim 7 is characterized in that, described picture frame detector specifically comprises:
Counter is used for when two continuous picture frames differ from one another, a count value of the described counter that adds up, and when two continuous picture frames are mutually the same, the described count value of the described counter of resetting;
Wherein, when described count value during greater than a setting value, described picture frame detector judges that described second picture frame is dynamic picture frame, and when described count value was less than or equal to described setting value, described picture frame detector judged that described second picture frame is static picture frame.
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| US20160098962A1 (en) * | 2014-10-07 | 2016-04-07 | Innolux Corporation | Display device and driving method thereof |
| CN105825835B (en) * | 2015-07-29 | 2018-06-26 | 维沃移动通信有限公司 | A kind of method and electronic equipment for adjusting electronic equipment display brightness |
| CN105225627B (en) * | 2015-10-23 | 2018-01-09 | 深圳市华星光电技术有限公司 | A kind of display device and its driving method |
| CN109166545B (en) * | 2018-09-27 | 2022-02-22 | 京东方科技集团股份有限公司 | Driving method and driving device of AR/VR (augmented reality/virtual reality) display equipment and display equipment |
| CN110444170A (en) * | 2019-08-21 | 2019-11-12 | 四川长虹电器股份有限公司 | Reduce the control system and method for LCD TV backlight power |
| CN110619855B (en) * | 2019-09-30 | 2021-02-26 | 京东方科技集团股份有限公司 | Display device and driving method thereof |
| CN114627823B (en) * | 2020-12-11 | 2024-06-04 | 纬联电子科技(中山)有限公司 | Liquid crystal display and picture display method |
| CN112885299B (en) * | 2021-01-22 | 2022-06-24 | 合肥京东方卓印科技有限公司 | Display brightness compensation method, compensation circuit and display device |
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