CN101425266B - Overdrive method and overdrive circuit - Google Patents
Overdrive method and overdrive circuit Download PDFInfo
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- CN101425266B CN101425266B CN200710124260XA CN200710124260A CN101425266B CN 101425266 B CN101425266 B CN 101425266B CN 200710124260X A CN200710124260X A CN 200710124260XA CN 200710124260 A CN200710124260 A CN 200710124260A CN 101425266 B CN101425266 B CN 101425266B
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Abstract
The invention provides an overdrive method and an overdrive circuit to achieve the overdrive method. The overdrive circuit comprises a treatment circuit, the treatment circuit comprises a comparison table, and when the current frame data-signals and the previous frame data-signals are input into the treatment circuit at the same time, the corrected gray-scale value for each pixel can be calculated out through a combination of an interpolation computing method and the comparison table, and the treatment circuit outputs a frame of corrected data signals after the gray-scale value for each pixel is corrected. When the gray-scale value for any pixel of the current frame data-signals is equal to the gray-scale value for the corresponding pixel of the previous frame data-signals, the corrected gray-scale value for the pixel is equal to the gray-scale value of the current frame. The overdrive method and the overdrive circuit to achieve the overdrive method improve the display quality of a liquid crystal display device adopting the overdrive method.
Description
Technical field
The present invention relates to a kind of over-driving method and realize the overdrive circuit of this over-driving method.
Background technology
Liquid crystal indicator realizes that it mainly is to realize through some pixels that are arranged that image shows.Extraneous data-signal is handled through this LCD drive circuits; This driving circuit applies different data-signals so that the different angle of the liquid crystal deflecting element of each pixel to each pixel; The deflection angle of liquid crystal molecule has determined the light transmission capacity of respective pixel; Thereby the trichromatic brightness that each pixel is shown is different, and the different three primary colors of brightness carry out colour mixture in the space, and human eye has just been seen colored picture.Usually, liquid crystal molecule is very slow to the response of the data-signal of the real-time change that loaded, thereby, afterimage phenomenon can appear when liquid crystal indicator shows moving image.In order to reduce or to suppress this phenomenon, industry is developed overdrive technique.
See also Fig. 1, it is a kind of circuit block diagram of prior art overdrive circuit.This overdrive circuit 10 comprises a storer 11 and a treatment circuit 12, and this storer 11 is used to store the former frame data-signal, and this treatment circuit 12 comprises the comparison list (see figure 2).Current frame data signal and former frame data-signal input to this treatment circuit 12 simultaneously, and this treatment circuit 12 is confirmed corresponding correction data signal and exported this driving circuit to according to the table of comparisons of its storage.
See also Fig. 2, it is the synoptic diagram of the stored table of comparisons of treatment circuit among Fig. 1.The table of comparisons shown in Figure 2 is that data-signal is the situation of 256 rank GTGs, the initial GTG value of first line display of this table of comparisons, and promptly each pixel gray level value of former frame data-signal among Fig. 1 has 256; The target gray scale value is shown in first tabulation of this table of comparisons, and promptly the GTG value of each pixel of current frame data signal among Fig. 1 has 256; Initial GTG value and target gray scale value infall are each pixel gray level value of correction data signal among Fig. 1, total 256*256.For example: during 252 GTGs of the data-signal of a certain pixel from 0 gray scale variation of former frame to present frame, the correction data signal of this pixel is 255 GTGs; During 5 GTGs of the data-signal of a certain pixel from 254 gray scale variation of former frame to present frame, the correction data signal of this pixel is 0 GTG.This shows, can confirm the correction data signal of data-signal from arbitrary initial GTG value to arbitrary target gray scale value of each pixel based on this table of comparisons.
Yet this overdrive circuit 10 needs jumbo storer to store this table of comparisons, so the cost of this overdrive circuit 10 is higher.For this reason, industry has developed another kind of overdrive technique, and this overdrive technique is to combine a kind of simplification table of comparisons (as shown in Figure 3) to restore the original table of comparisons (being the table of comparisons shown in Figure 2) through a kind of interpolative operation method.
See also Fig. 3, it is the synoptic diagram that a kind of prior art is simplified the table of comparisons.The simplification table of comparisons shown in Figure 3 is still the situation that data-signal is 256 rank GTGs; This simplifies the initial GTG value of first line display of the table of comparisons; Be that each pixel gray level value of former frame data-signal is 0,16,32,48,64,80,96,112,128,144,160,176,192,208,224,240,255 among Fig. 1, have 17; The target gray scale value is shown in first tabulation of this table of comparisons, and promptly each pixel gray level value of former frame data-signal is 0,16,32,48,64,80,96,112,128,144,160,176,192,208,224,240,255 among Fig. 1, has 17; Initial GTG value and target gray scale value infall are the part GTG value of correction data signal among Fig. 1, total 17*17.Therefore, this simplification table of comparisons is only stored about 1/15 information of the original table of comparisons, so the corresponding minimizing of the memory space of the overdrive circuit that this overdrive technique adopted.
This interpolative operation method is shown in following table and following formula:
X
1＝[(B-A)/(G
3-G
1)]*(G
2-G
1)+A
X
3＝[(D-C)/(G
3-G
1)]*(G
2-G
1)+C
X
2＝[(X
3-X
1)/(G
6-G
4)]*(G
5-G
4)+X
1
X
2′＝[(C-A)/(G
6-G
4)]*(G
5-G
4)+A
X
2″＝[(D-B)/(G
6-G
4)]*(G
5-G
4)+B
Wherein, G
1, G
3, G
4, G
6, A, B, C, D be for simplifying the known quantity in the table of comparisons, G
2Be G
1, G
3Between any GTG value, G
5Be G
4, G
6Between any GTG value, X
1, X
2, X
3, X
2', X
2" be unknown quantity.Just restore the original table of comparisons thus.
See also Fig. 4, it is to adopt the interpolative operation method of prior art to combine the part synoptic diagram of the table of comparisons that the simplification table of comparisons shown in Figure 3 restores.For example, work as G
1=16, G
2=17, G
3=2, G
4=16, G
5=17, G
6=32, when A=16, B=2, C=100, D=32, can calculate X
1=15, X
2=19, X
3=94; Work as G
2=24, G
5=30, other is worth when constant, can calculate X
1=0, X
2=46, X
3=54.
Yet; This interpolative operation method is to serve as according to carrying out computing with the known quantity A in this simplification table of comparisons, B, C, D; As B, C is bigger than normal or when less than normal, the table of comparisons that combines this simplification table of comparisons to restore through this interpolative operation method mistake can occur in the initial GTG value place identical with the target gray scale value.For example initial GTG value is 20, the target gray scale value is 20, and the over-drive value that restores through this interpolative operation method is 24, and the over-drive value of actual needs is 20.Therefore adopt this interpolative operation method to combine the liquid crystal indicator of over-driving method of the table of comparisons of this simplification still to have the not high problem of display quality.
Summary of the invention
In order to solve the not high problem of liquid crystal indicator display quality in the prior art, be necessary to provide a kind of over-driving method that can effectively improve the liquid crystal indicator display quality.
Be necessary to provide a kind of overdrive circuit of realizing this over-driving method simultaneously.
A kind of over-driving method; The overdrive circuit of realizing this over-driving method comprises a treatment circuit; This treatment circuit comprises comparison list, and this over-driving method may further comprise the steps: a. current frame data signal and former frame data-signal input to this treatment circuit simultaneously; B. combine this table of comparisons to calculate the GTG value of the correction of each pixel through an interpolative operation method; When the GTG value of arbitrary pixel of this former frame data-signal equaled the GTG value of respective pixel of current frame, the GTG value of the correction of this pixel equaled the GTG value of current frame; C. this treatment circuit was exported the data-signal that a frame is proofreaied and correct after the GTG value of all pixels was proofreaied and correct and finished.
A kind of overdrive circuit; This overdrive circuit comprises a treatment circuit; This treatment circuit comprises comparison list; Current frame data signal and former frame data-signal input to this treatment circuit simultaneously, and the GTG value of the correction of each pixel can combine this table of comparisons to calculate through an interpolative operation method, and this treatment circuit was exported the data-signal that a frame is proofreaied and correct after the GTG value of all pixels was proofreaied and correct and finished.When the GTG value of arbitrary pixel of this former frame data-signal equaled the GTG value of respective pixel of current frame, the GTG value of the correction of this pixel equaled the GTG value of current frame.
Compared with prior art; The interpolative operation method that over-driving method of the present invention adopted confirms that at first the GTG value of the correction that initial GTG value and target gray scale value exist together mutually equals this initial GTG value; Therefore; The over-drive value of the original table of comparisons in the initial GTG value place identical with the target gray scale value that the interpolative operation method that over-driving method of the present invention adopted and the simplification table of comparisons restore conforms to the over-drive value of actual needs, thereby improved the display quality of the liquid crystal indicator that adopts this over-driving method.
Overdrive circuit of the present invention is corresponding to have above-mentioned beneficial effect.
Description of drawings
Fig. 1 is a kind of circuit block diagram of prior art overdrive circuit.
Fig. 2 is the synoptic diagram of the stored table of comparisons of treatment circuit among Fig. 1.
Fig. 3 is the synoptic diagram that a kind of prior art is simplified the table of comparisons.
Fig. 4 adopts the interpolative operation method of prior art to combine the part synoptic diagram of the table of comparisons that the simplification table of comparisons shown in Figure 3 restores.
Fig. 5 is the circuit block diagram that adopts the liquid crystal indicator of over-driving method of the present invention.
Fig. 6 is the circuit block diagram of overdrive circuit shown in Figure 5.
Fig. 7 is the synoptic diagram of the simplification table of comparisons that adopts of over-driving method of the present invention.
Fig. 8 is the part synoptic diagram that the interpolative operation method that adopts of over-driving method of the present invention combines to simplify the original table of comparisons that the table of comparisons restores.
Embodiment
See also Fig. 5, it is the circuit block diagram that adopts the liquid crystal indicator of over-driving method of the present invention.This liquid crystal indicator 200 comprises an overdrive circuit 20, one drive circuit 24 and a display panels 25, and this display panels 25 comprises a plurality of pixels 26 that are arranged.Extraneous data-signal inputs to this overdrive circuit 20; 20 pairs of these data-signals of this overdrive circuit are proofreaied and correct; Data-signal after 24 pairs of corrections of this driving circuit is handled and is applied different data-signals so that the different angle of the liquid crystal deflecting element of each pixel 26 to each pixel 26 of this display panels 25; The deflection angle of liquid crystal molecule has determined the light transmission capacity of respective pixel 26; Thereby the trichromatic brightness that each pixel 26 is shown is different, and the different three primary colors of brightness carry out colour mixture in the space, and human eye has just been seen colored picture.
See also Fig. 6, it is the circuit block diagram of overdrive circuit shown in Figure 5.This overdrive circuit 20 comprises a storer 21 and a treatment circuit 22, and this storer 21 is used to store the former frame data-signal, and this treatment circuit comprises that one simplifies the table of comparisons, and is as shown in Figure 7.For the ease of making comparisons with prior art, existing is that the situation of 256 rank GTGs is that example describes with data-signal still.This simplifies the initial GTG value of first line display of the table of comparisons, and promptly each pixel gray level value of former frame data-signal is 0,16,32,48,64,80,96,112,128,144,160,176,192,208,224,240,255 among Fig. 6, has 17; This simplifies the first line display target gray scale value of the table of comparisons, and promptly each pixel gray level value of current frame data signal is 0,16,32,48,64,80,96,112,128,144,160,176,192,208,224,240,255 among Fig. 6, has 17; Initial GTG value and target gray scale value infall are the part GTG value of correction data signal among Fig. 6, total 17*17.Initial GTG value equals this initial GTG value with the GTG value of the correction that the target gray scale value exists together mutually.
Current frame data signal and former frame data-signal input to this treatment circuit 22 simultaneously, and this treatment circuit 22 combines this simplification table of comparisons to calculate corresponding correction data signal and output based on the data-signal of input through a new interpolative operation method.
Suppose pixel P in the former frame data-signal at present
1The GTG value be G
2, pixel P
2The GTG value be G
3, pixel P in the current frame data signal
1The GTG value be G
3, pixel P
2The GTG value be G
2, wherein, pixel P
1, P
2And GTG value G
2, G
3Choose and all have arbitrariness.Pixel P then
1, P
2The GTG value X of correction
4, X
3Computation process following:
A., one blank table is provided.This blank table is used for this computation process of clearer explanation, does not in fact exist.Initial GTG value, i.e. each pixel gray level value of former frame data-signal among Fig. 6 are shown in first tabulation of this blank table; The first line display target gray scale value of this blank table, i.e. the GTG value of each pixel of current frame data signal among Fig. 6; Initial GTG value and target gray scale value infall are each pixel gray level value of correction data signal among Fig. 6.Any a part of structure of this blank table is as shown in the table:
B. be listed as the GTG value G that inserts the simplification table of comparisons shown in Figure 7 respectively at first row and first
1, G
4, wherein, G
1Less than G
2, G
4Greater than G
3Simultaneously, initial GTG value G
1To target gray scale value G
1GTG value A, the initial GTG value G of correction
4To target gray scale value G
1GTG value B, the initial GTG value G of correction
1To target gray scale value G
4GTG value C, the initial GTG value G of correction
4To target gray scale value G
4The GTG value D of correction all can from the simplification table of comparisons shown in Figure 7, directly obtain, also insert this blank table together, as follows:
Wherein, A=G
1, D=G
4
C. insert the GTG value identical in the initial GTG value place identical, promptly initial GTG value G with initial GTG value with the target gray scale value
2To target gray scale value G
2The GTG value E=G of correction
2, initial GTG value G
3To target gray scale value G
3The GTG value F=G of correction
3Suppose initial GTG value G simultaneously
4To target gray scale value G
2The GTG value of correction be X
1, initial GTG value G
4To target gray scale value G
3The GTG value of correction be X
1', initial GTG value G
3To target gray scale value G
1The GTG value of correction be X
2', initial GTG value G
2To target gray scale value G
1The GTG value of correction be X
2", initial GTG value G
1To target gray scale value G
3The GTG value of correction be X
3, initial GTG value G
1To target gray scale value G
2The GTG value of correction be X
3', initial GTG value G
2To target gray scale value G
4The GTG value of correction be X
4', initial GTG value G
3To target gray scale value G
4The GTG value of correction be X
4", as shown in the table:
D. unknown quantity X
1, X
2, X
3, X
4, X
1', X
2', X
2", X
3', X
4', X
4" value calculate by following interpolative operation formula (1) to (10):
X
1＝[(D-B)/(G
4-G
1)]*(G
2-G
1)+B (1)
X
2＝[(X
1-E)/(G
4-G
2)]*(G
3-G
2)+E (2)
X
3＝[(C-A)/(G
4-G
1)]*(G
3-G
1)+A (3)
X
4＝[(F-X
3)/(G
3-G
1)]*(G
2-G
1)+X
3 (4)
X
1′＝[(D-B)/(G
4-G
1)]*(G
3-G
1)+B (5)
X
2′＝[(B-A)/(G
4-G
1)]*(G
3-G
1)+A (6)
X
2″＝[(B-A)/(G
4-G
1)]*(G
2-G
1)+A (7)
X
3′＝[(C-A)/(G
4-G
1)]*(G
2-G
1)+A (8)
X
4′＝[(D-C)/(G
4-G
1)]*(G
2-G
1)+C (9)
X
4″＝[(D-C)/(G
4-G
1)]*(G
3-G
1)+C (10)
Wherein, this X
1, X
2, X
3, X
4, X
1', X
2', X
2", X
3', X
4', X
4" calculating all relate to A, E, F, these four parameters of D, promptly all be that the GTG value of the correction that exists together mutually with this initial GTG value and target gray scale value serves as according to carrying out computing.
Above-mentioned GTG value G
2, G
3Choose and all have arbitrariness, therefore adopt the aforementioned calculation method can calculate the data-signal of data-signal from arbitrary initial GTG value to the correction of arbitrary target gray scale value of each pixel.
According to above-mentioned computing method, the principle of work of this treatment circuit 22 can be summarized as: current frame data signal and former frame data-signal input to this treatment circuit 22 simultaneously.The data-signal of the correction of each pixel can calculate through this interpolative operation formula (1) to (10).The data-signal that this treatment circuit 22 outputs one frame was proofreaied and correct after the data-signal of all pixels was proofreaied and correct and finished.
See also Fig. 8, the part synoptic diagram of the original table of comparisons that its interpolative operation method combination simplification table of comparisons that is over-driving method of the present invention adopts restores.For example, work as G
1=16, G
2=20, G
3=27, G
4=32 o'clock, can confirm A=16, B=2, C=100, D=32, E=20, F=27, can calculate X by interpolative operation formula (1) to (10)
1=10, X
2=14, X
3=74, X
4=57, X
1'=23, X
2'=6, X
2"=12, X
3'=37, X
4'=83, X
4"=53.In this original table of comparisons, when initial GTG value be 20, when the target gray scale value is 20, the over-drive value that restores through this interpolative operation method is 20; When initial GTG value be 21, when the target gray scale value is 20, the over-drive value that restores through this interpolative operation method is 19.Promptly conform to the over-drive value of actual needs.
Compared with prior art; The interpolative operation method that over-driving method of the present invention adopted confirms that at first the GTG value of the correction that initial GTG value and target gray scale value exist together mutually equals this initial GTG value, and initial GTG value and the GTG value of the correction of target gray scale value variation smaller part are that the GTG value of the correction that exists together mutually with this initial GTG value and target gray scale value serves as that foundation is carried out computing.Therefore; The interpolative operation method that over-driving method of the present invention adopted and simplify the original table of comparisons that the table of comparisons restores over-drive value identical in initial GTG value or that change less place and conform to the over-drive value of actual needs with the target gray scale value, thus the display quality of the liquid crystal indicator that adopts this over-driving method improved.
Claims (10)
1. an over-driving method realizes that the overdrive circuit of this over-driving method comprises a treatment circuit, and this treatment circuit comprises comparison list, and this over-driving method may further comprise the steps:
A. current frame data signal and former frame data-signal input to this treatment circuit simultaneously;
B. combine this table of comparisons to calculate the GTG value of the correction of each pixel through an interpolative operation method; When the GTG value of arbitrary pixel of this former frame data-signal equaled the GTG value of respective pixel of current frame, the GTG value of the correction of this pixel equaled the GTG value of current frame;
C. this treatment circuit was exported the data-signal that a frame is proofreaied and correct after the GTG value of all pixels was proofreaied and correct and finished.
2. over-driving method as claimed in claim 1 is characterized in that: this interpolative operation method comprises interpolative operation formula (1) to (10):
X
1＝[(D-B)/(G
4-G
1)]*(G
2-G
1)+B (1)
X
2＝[(X
1-E)/(G
4-G
2)]*(G
3-G
2)+E (2)
X
3＝[(C-A)/(G
4-G
1)]*(G
3-G
1)+A (3)
X
4＝[(F-X
3)/(G
3-G
1)]*(G
2-G
1)+X
3 (4)
X
1′＝[(D-B)/(G
4-G
1)]*(G
3-G
1)+B (5)
X
2′＝[(B-A)/(G
4-G
1)]*(G
3-G
1)+A (6)
X
2″＝[(B-A)/(G
4-G
1)]*(G
2-G
1)+A (7)
X
3′＝[(C-A)/(G
4-G
1)]*(G
2-G
1)+A (8)
X
4′＝[(D-C)/(G
4-G
1)]*(G
2-G
1)+C (9)
X
4″＝[(D-C)/(G
4-G
1)]*(G
3-G
1)+C (10)
The relation of each parameter is shown in table () in this interpolative operation formula (1) to (10):
Table (one)
Wherein, the initial GTG value of first line display of table (), first tabulation shows that target gray scale value, initial GTG value and target gray scale value infall represent the GTG value of proofreading and correct, G
1, G
4, A, B, C, D be the known quantity in this table of comparisons, and A=G
1, D=G
4, G
2, G
3Be G
1, G
4Between any GTG value, E=G
2, F=G
3, X
1, X
2, X
3, X
4, X
1', X
2', X
2", X
3', X
4', X
4" be unknown quantity.
3. over-driving method as claimed in claim 2 is characterized in that: this table of comparisons is a simplification table of comparisons.
4. over-driving method as claimed in claim 3 is characterized in that: the initial GTG value of first line display of this simplification table of comparisons, the target gray scale value is shown in first tabulation of this simplification table of comparisons.
5. over-driving method as claimed in claim 4 is characterized in that: the GTG value of first row of this simplification table of comparisons is 17, and the GTG value of first row of this simplification table of comparisons is 17.
6. over-driving method as claimed in claim 5 is characterized in that: the current frame data signal is 256 rank GTGs.
7. over-driving method as claimed in claim 6; It is characterized in that: the GTG value of first row of this simplification table of comparisons is 0,16,32,48,64,80,96,112,128,144,160,176,192,208,224,240,255, and the GTG value of first row of this simplification table of comparisons is 0,16,32,48,64,80,96,112,128,144,160,176,192,208,224,240,255.
8. over-driving method as claimed in claim 1 is characterized in that: this overdrive circuit also comprises a storer, and this storer is used to store the former frame data-signal.
9. overdrive circuit; This overdrive circuit comprises a treatment circuit; This treatment circuit comprises comparison list; Current frame data signal and former frame data-signal input to this treatment circuit simultaneously, and the GTG value of the correction of each pixel can combine this table of comparisons to calculate through an interpolative operation method, and this treatment circuit was exported the data-signal that a frame is proofreaied and correct after the GTG value of all pixels was proofreaied and correct and finished; When the GTG value of arbitrary pixel of this former frame data-signal equaled the GTG value of respective pixel of current frame, the GTG value of the correction of this pixel equaled the GTG value of current frame.
10. overdrive circuit as claimed in claim 9 is characterized in that: this overdrive circuit also comprises a storer, and this storer is used to store the former frame data-signal.
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| US8665194B2 (en) * | 2010-03-11 | 2014-03-04 | Realtek Semiconductor Corp. | Over-drive controller applied to a display panel and method for over-drive control therein |
| US9530343B2 (en) * | 2014-06-23 | 2016-12-27 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Method for correcting gray-scale of display panel |
| CN104317085B (en) | 2014-11-13 | 2017-01-25 | 京东方科技集团股份有限公司 | Data voltage compensation method, data voltage compensation device and display device |
| CN106935169B (en) * | 2015-12-31 | 2020-08-11 | 元太科技工业股份有限公司 | Electronic paper display device and driving method thereof |
| US10964278B2 (en) * | 2017-02-24 | 2021-03-30 | Sakai Display Products Corporation | Display apparatus |
| CN109509452B (en) * | 2018-12-21 | 2021-07-06 | 惠科股份有限公司 | Driving method, device, equipment, display and readable storage medium |
| CN109410850B (en) * | 2018-12-24 | 2021-02-12 | 惠科股份有限公司 | Debugging method and using method of overdrive brightness value lookup table and display panel |
| CN111554244A (en) * | 2020-05-21 | 2020-08-18 | Tcl华星光电技术有限公司 | Driving method and device of liquid crystal display and liquid crystal display |
| CN114333725B (en) * | 2020-08-09 | 2022-12-13 | 合肥奕斯伟集成电路有限公司 | Liquid crystal display, driving compensation method and driving compensation device thereof |
| US11315486B1 (en) * | 2020-10-05 | 2022-04-26 | Novatek Microelectronics Corp. | Image processing circuit and image processing method with overdriving illumination element |
| CN112735347A (en) * | 2020-12-30 | 2021-04-30 | Tcl华星光电技术有限公司 | Overvoltage compensation method and device, display panel and storage medium |
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| CN1652192A (en) * | 2005-02-23 | 2005-08-10 | 乐金电子（沈阳）有限公司 | Apparatus and method for regulating common electrode voltage of liquid crystal display |
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