CN1828713A - Overdrive device and its method - Google Patents
Overdrive device and its method Download PDFInfo
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- CN1828713A CN1828713A CN 200510053196 CN200510053196A CN1828713A CN 1828713 A CN1828713 A CN 1828713A CN 200510053196 CN200510053196 CN 200510053196 CN 200510053196 A CN200510053196 A CN 200510053196A CN 1828713 A CN1828713 A CN 1828713A
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Abstract
Wherein, the device comprises a storage unit to store the pixel gray values in different frames, and an overdrive selecting unit to select at least one overdrive table and output the pixel gray value according to the opposite gray values in last two frames and the gray value comparison with last value. This invention can improve performance of dynamic frame effectively.
Description
(1) technical field
The invention relates to a kind of over-driving device and method thereof, particularly relevant for a kind of grey scale pixel value comparison according to previous frame and the first two frame to obtain the over-driving device and the method thereof of required the overdriving of frame pixel to be shown (Over Driving) gray-scale value.
(2) background technology
Figure 1A is that too slow pixel grey scale of the pixel intensity reaction time of existing LCD changes and pixel intensity changes contrast figure.Shown in Figure 1A, when grey scale pixel value switched to the g1 value by the g0 value during in time t0, corresponding pixel intensity was also changed into the Y1 value by the Y0 value.Yet, cause the brightness of a pixel period (t1-t0) interior pixel also can't reach the Y1 value of expection because the reaction time that actual pixels brightness is changed into the Y1 value by Y0 value is long.
Too slow problem of reaction time in order to solve the liquid crystal display displays frame traditionally, and used over-driving method, to shorten LCD is switched to next display frame by the pixel grey scale brightness of a certain display frame the required reaction time of pixel grey scale brightness.Shown in Figure 1B, for the reaction time that makes pixel intensity shortens, actual grey scale pixel value be when time t0 by g0 value switch to g1 ' value (g1 '＞g1), make pixel intensity can be in the time (t1-t0) be the Y1 value by the arrival of Y0 value.Owing to be to drive to quicken the liquid crystal rotation with too high or too low gray-scale value to reach required pixel intensity, therefore be called " overdriving ".And the gray-scale value g1 ' that overdrives is relevant with gray-scale value g0 and g1.
Fig. 2 A is the over-driving device structure calcspar of existing LCD.Please refer to Fig. 2 A, the LCD that with the resolution is I * J is an example, and over-driving device 200 comprises control module 210, frame memory (Frame Memory) 220 and overdrives and consult unit 230.Control module 210 is in order to receive the grey scale pixel value of corresponding each pixel in each frame.With G (M+1, i, j) (i, the j) grey scale pixel value of pixel, wherein 1≤i≤I, and 1≤j≤J in expression (M+1) frame that is to be shown the picture.G (M, i, j) (i, j) grey scale pixel value of pixel in expression M frame that is the previous frame.Frame memory 220 in order to all grey scale pixel value G of storing the M frame (M, i, j).Overdrive and consult unit 230 in order to according to corresponding (i in (M+1) frame to be shown, j) the grey scale pixel value G (M+1 of pixel, i, corresponding (i, j) the grey scale pixel value G of pixel (M j) and in the previous M frame, i, j), the contrast look-up table 232 of overdriving is with the output gray-scale value God (M+1 that overdrives, i is j) to display panels 240.
Shown in Fig. 2 B, the existing look-up table 232 of overdriving is to be a kind of two-dimentional look-up table.X-axis is represented the gray-scale value G (M) of M frame, and Y-axis is represented the gray-scale value G (M+1) of (M+1) frame.If is example with 8 bits, gray-scale value G (M) and G (M+1) respectively are 0～255 totally 256 values.Corresponding a certain pixel can contrast the gray-scale value G (M) of the gray-scale value G (M+1) of this (M+1) frame in the look-up table 232 and previous M frame and obtains in the gray-scale value God (M+1) that overdrives of (M+1) frame.
The above-mentioned look-up table 232 of overdriving is to be a kind of static state look-up table of overdriving, gray-scale value God (M+1) only considers the gray-scale value G (M+1) of (M+1) frame and the gray-scale value G (M) of M frame because overdrive, and supposes that the gray-scale value G (M-1) of (M-1) frame equals the gray-scale value G (M) of M frame.Yet in fact the gray-scale value G (M-1) of (M-1) frame is different from gray-scale value G (M) probably, and therefore, the actual required gray-scale value of overdriving can not be the God (M+1) of the static look-up table gained of overdriving of contrast.
As shown in Figure 3A, show,, but drop to the g0 value by the g3 value earlier if the grey scale pixel value before the time t0 is not stable g0 value through experiment.When the gray-scale value of overdriving is taken as g1 ' value, after a frame period (t1-t0), pixel intensity is not the Y1 value that is arrived expection by the Y0 value, but arrives higher Y2 value earlier, need get back to required Y1 value gradually.Shown in Fig. 3 B, and be taken as g1 when the gray-scale value of overdriving changes " during value (g1 " ≠ g1 '), just pixel intensity can arrive required Y1 value smoothly by the Y0 value.Therefore, be not under the situation of dull frame demonstration in the face of actual LCD frame, only utilize above-mentioned static look-up table to obtain the gray-scale value of overdriving, obviously still can't effectively improve the animation quality.
(3) summary of the invention
Purpose of the present invention is exactly in order to address the above problem, a kind of over-driving device and method thereof are provided, according to the grey scale pixel value of the grey scale pixel value of frame to be shown, previous frame and the grey scale pixel value of the first two frame, select the static or look-up table of dynamically overdriving of contrast, to obtain the required gray-scale value of overdriving, can effectively improve the animation display quality.
The object of the present invention is achieved like this, a kind of over-driving device is proposed, be applied to display panels, in order to receive a corresponding pixel in a plurality of grey scale pixel values of a plurality of frames, and the output gray-scale value of overdriving according to this, described over-driving device comprises: the storage unit and the selected cell of overdriving, storage unit is in order to store corresponding this pixel in the grey scale pixel value of these a little frames, the selected cell of overdriving connects storage unit, in order to comparison according to the grey scale pixel value of corresponding this pixel in the grey scale pixel value of corresponding this pixel in two frames before the frame to be shown and the previous frame, select required at least one look-up table of overdriving, and according to the grey scale pixel value of corresponding this pixel in the grey scale pixel value of corresponding this pixel in the frame to be shown and the previous frame, contrast the selected look-up table of overdriving, with the output gray-scale value of overdriving.
According to purpose of the present invention, another kind of over-driving device is proposed, be applied to display panels, in order to receiving a plurality of grey scale pixel values of a corresponding pixel in a plurality of frames, and the gray-scale value of overdriving of output according to this.Over-driving device comprises storage unit and overdrives and consult the unit.Storage unit is in order to store corresponding this pixel in the grey scale pixel value of these a little frames.Overdrive and consult unit connection storage unit, in order to grey scale pixel value according to this pixel of correspondence in the grey scale pixel value of corresponding this pixel in the grey scale pixel value of corresponding this pixel in the frame to be shown, the previous frame and the first two frame, contrast at least one look-up table of overdriving, to export the required gray-scale value of overdriving.
According to another object of the present invention, a kind of over-driving method is proposed, be applied to display panels, the grey scale pixel value in order to according to a corresponding pixel in the frame to be shown draws the gray-scale value of overdriving.Over-driving method comprises the grey scale pixel value of corresponding this pixel in the grey scale pixel value that utilizes before the frame to be shown corresponding this pixel in two frames and the previous frame, draws a comparison result value of corresponding this pixel; And the grey scale pixel value that draws corresponding this pixel in the grey scale pixel value of corresponding this pixel in the comparison result value of corresponding this pixel, the frame to be shown and the previous frame according to the first two frame and previous frame, contrast at least one look-up table of overdriving, to obtain the gray-scale value of overdriving.
According to another object of the present invention, another kind of over-driving method is proposed, be applied to display panels, the grey scale pixel value in order to according to a corresponding pixel in the frame to be shown draws the gray-scale value of overdriving.Over-driving method comprises the grey scale pixel value according to corresponding this pixel in the grey scale pixel value of corresponding this pixel in the grey scale pixel value of corresponding this pixel in the frame to be shown, the previous frame and the first two frame, contrast at least one look-up table of overdriving, to obtain the gray-scale value of overdriving.
Effect of the present invention:
The advantage of over-driving device of the present invention and method thereof is to utilize the comparison of the grey scale pixel value of the grey scale pixel value of previous frame of frame to be shown and the first two frame, select the suitable look-up table of overdriving, to obtain the required gray-scale value of overdriving, only use the overdrive mode of look-up table of static state, the quality of more effective raising dynamic frame than prior art.
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For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
(4) description of drawings
Figure 1A is that too slow pixel grey scale of the pixel intensity reaction time of existing LCD changes and pixel intensity changes contrast figure.
Figure 1B is that the existing utilization mode of overdriving changes with the pixel grey scale that shortens the pixel intensity reaction time and pixel intensity changes contrast figure.
Fig. 2 A is the over-driving device structure calcspar of existing LCD.
Fig. 2 B is the existing look-up table synoptic diagram of overdriving.
Fig. 3 A is that the grey scale pixel value of the first two frame uses when inequality the pixel grey scale of the static mode of overdriving to change and pixel intensity changes contrast figure.
Fig. 3 B is that the grey scale pixel value of the first two frame utilizes when inequality the new gray-scale value of overdriving to obtain that pixel grey scale that preferable pixel intensity changes changes and pixel intensity changes contrast figure.
Fig. 4 A illustrates a kind of over-driving device structure calcspar according to first embodiment of the invention.
Fig. 4 B illustrates according to the over-driving device structure calcspar that has another selected cell of overdriving in the first embodiment of the invention.
Fig. 4 C illustrates according to the over-driving device structure calcspar that has the third selected cell of overdriving in the first embodiment of the invention.
Fig. 4 D illustrates according to first embodiment of the invention the previous frame of frame to be shown and the grey scale pixel value difference picture of the first two frame is divided into five gray-scale value scope synoptic diagram.
Fig. 4 E illustrates according to the over-driving device structure calcspar that has the 4th kind of selected cell of overdriving in the first embodiment of the invention.
Fig. 5 illustrates according to first embodiment of the invention over-driving method process flow diagram.
Fig. 5 A illustrates first kind of thin portion process flow diagram of over-driving method among Fig. 5 A.
Fig. 5 B illustrates second kind of thin portion process flow diagram of over-driving method among Fig. 5 A.
Fig. 5 C illustrates the third thin portion process flow diagram of over-driving method among Fig. 5 A.
Fig. 5 D illustrates the 4th kind of thin portion process flow diagram of over-driving method among Fig. 5 A.
Fig. 6 A illustrates according to second embodiment of the invention over-driving device structure calcspar.
Fig. 6 B illustrates among Fig. 6 A the three-dimensional look-up table synoptic diagram of overdriving.
Fig. 6 C illustrates another over-driving device structure calcspar according to second embodiment of the invention.
Fig. 6 D illustrates according to second embodiment of the invention over-driving method process flow diagram.
Fig. 6 E illustrates another over-driving method process flow diagram according to second embodiment of the invention.
Main element symbol description in the accompanying drawing:
200,400,600: over-driving device
210: control module
220,622: frame memory
230,431,450,460,630: overdrive and consult the unit
232: the look-up table of overdriving
240,440,640: display panels
420,620: storage unit
400: over-driving device
430: the selected cell of overdriving
432: comparing unit
433,470: select compensating unit
434: the dynamically recording unit
435,438,462,635: the static state look-up table of overdriving
436: select to consult the unit
437: the look-up table of dynamically overdriving
439,472: the dynamic compensation look-up table
440: display panels
452,632: the three-dimensional look-up table of overdriving
634: static over-drive unit
636: the dynamic compensation unit
637: Three-Dimensional Dynamic compensation look-up table
(5) embodiment
Please refer to Fig. 4 A, it illustrates a kind of over-driving device structure calcspar according to first embodiment of the invention.The LCD that with the resolution is I * J is an example, over-driving device 400 is to receive corresponding (i, j) pixel in the grey scale pixel value G of M+1 frame (M+1, i, j), and the corresponding (i of output according to this, j) pixel in the gray-scale value God that overdrives of M+1 frame (M+1, i, j), wherein 1iI, and 1jJ.Over-driving device 400 comprises storage unit 420 and the selected cell 430 of overdriving.
Shown in Fig. 4 A, the selected cell 430 of overdriving more comprises comparing unit 432, dynamically recording unit 434 and selects to consult unit 436.Comparing unit 432 be in order to frame more to be shown grey scale pixel value G (M+1, i, j) and the grey scale pixel value G of previous frame (M, i, j), with export corresponding comparison result value D (M+1, i, j).Dynamically recording unit 434 connects comparing unit 432 and selects to consult unit 436, and in order to export the comparison result value D that previous frame and the first two frame draw (M, i, j) and comparison result value D of this correspondence of record (M+1, i, j).Selection consult unit 436 be the grey scale pixel value G that utilizes frame to be shown (M+1, i, j) and the grey scale pixel value G (M of previous frame, i, j) contrast static (Static) look-up table 435 of overdriving draws the static state gray-scale value Gs (M+1 that overdrives, i, j), and dynamic (Dynamic) look-up table 437 of overdriving of contrast, draw the gray-scale value Gd (M+1 that dynamically overdrives, i, j), then according to comparison result value D (M, i, j) select the static state gray-scale value Gs (M+1 that overdrives, i, gray-scale value Gd (M+1, i j) or dynamically overdrive, j), (M+1, i is j) to display panels 440 and be output as the gray-scale value God that overdrives.Next (i, sign j) make the description of summary of the invention more succinct with regard to omitting.
As the grey scale pixel value G (M) of the grey scale pixel value G of the first two frame (M-1) and previous frame when being identical, comparison result value D (M) is 0, and D-(M) is 1.So selecting to consult unit 436 and be according to comparison result value D (M) is, select the contrast static state look-up table 435 of overdriving, at 0 o'clock with the output gray-scale value God (M+1) that overdrives.At this moment, because the grey scale pixel value G (M-1) and the G (M) of the first two frame is steady state (SS), the use static state look-up table 435 gray-scale value God (M+1) that can be overdrived accurately that overdrives.And when the grey scale pixel value G of the first two frame (M-1) and the grey scale pixel value G (M) of previous frame were inequality, comparison result value D (M) was 1, and D-(M) is 0.So selecting to consult unit 436 and be according to comparison result value D (M) is 1 o'clock, selects the above-mentioned look-up table 437 of dynamically overdriving of contrast, with the output gray-scale value God (M+1) that overdrives.At this moment, because the grey scale pixel value G (M-1) and the G (M) of the first two frame is non-steady state, the use static state look-up table 435 gray-scale value God (M+1) that can't have been overdrived accurately that overdrives, thereby reelect with the look-up table 437 of dynamically overdriving.
In addition, please refer to Fig. 4 B, it illustrates according to the over-driving device structure calcspar that has another selected cell 430 of overdriving in the first embodiment of the invention.The selected cell 430 of overdriving also can be to comprise comparing unit 432, dynamically recording unit 434, overdrive and consult unit 431 and select compensating unit 433.Comparing unit 432 is in order to the grey scale pixel value G (M+1) of frame more to be shown and the grey scale pixel value G (M) of previous frame, to export corresponding comparison result value D (M+1).Dynamically recording unit 434 connects comparing unit 432 and selects compensating unit 433, in order to export the comparison result value D (M) that previous frame and the first two frame draw and to write down this corresponding comparison result value D (M+1).
Overdriving and consulting unit 431 is according to the grey scale pixel value G (M+1) of frame to be shown and the grey scale pixel value G (M) of previous frame, and the contrast static state look-up table 438 of overdriving is to export the static state gray-scale value Gs (M+1) that overdrives.Therefore, selecting compensating unit 433 is the comparison result value D (M) that draw according to the previous frame and the first two frame that are stored in the dynamically recording unit 434 by frame to be shown, according to dynamic compensation look-up table (Dynamic Compensative LUT) 439, the above-mentioned static state gray-scale value Gs (M+1) that overdrives is carried out gray-scale value compensation, and export the required gray-scale value God (M+1) that overdrives according to this.
As the grey scale pixel value G (M) of the grey scale pixel value G of the first two frame (M-1) and previous frame when being identical, comparison result value D (M) is 0.So selecting compensating unit 433 is to be 0 o'clock according to comparison result value D (M), via after the logical operation directly output static compensation gray-scale value Gs (M+1) as the gray-scale value God (M+1) that overdrives of correspondence.At this moment, because the grey scale pixel value G (M-1) and the G (M) of the first two frame is steady state (SS), utilize the static state look-up table 438 gray-scale value God (M+1) that can be overdrived accurately that overdrives.And when the grey scale pixel value G of the first two frame (M-1) and the grey scale pixel value G (M) of previous frame were inequality, comparison result value D (M) was 1.So selecting compensating unit 433 is to be 1 o'clock according to comparison result value D (M), add this dynamic compensation look-up table of contrast, and according to the grey scale pixel value G (M+1) of frame to be shown and the grey scale pixel value G (M) of previous frame, to draw dynamic compensation gray-scale value Gc (M+1), again via the logical operation post-compensation static state gray-scale value Gs (M+1) that overdrives, to export the required gray-scale value God (M+1) that overdrives, wherein God (M+1)=Gs (M+1)+D (M) * Gc (M+1).
As mentioned above, when G (M-1) is identical with G (M) D (M) be 0 and G (M-1) and G (M) when inequality D (M) be 1, can also be set at absolute difference as G (M-1) and G (M) | G (M-1)-G (M) | during less than critical gray scale difference x, D (M) is 0 and in the absolute difference of G (M-1) and G (M) | G (M-1)-G (M) | and when being not less than critical gray scale difference x, D (M) is 1.Critical gray scale difference x value can be stipulated and adjust according to the size of noise.For instance,, then can stipulate higher critical gray scale difference, result of calculation of the present invention be caused influence improperly to avoid noise if noise is bigger.Drive among the embodiment of 8 bits (bits) image datas (grey scale pixel value) one, critical gray scale difference for example is 8, and among the embodiment of driving 6 bits (bits) image datas (grey scale pixel value), critical gray scale difference for example is 2.
Please refer to Fig. 4 C, it illustrates according to the over-driving device structure calcspar that has the third selected cell 430 of overdriving in the first embodiment of the invention.The selected cell 430 of overdriving comprises comparing unit 432, dynamically recording unit 434 and overdrives and consult unit 450.Comparing unit 432 is in order to the grey scale pixel value G (M+1) of frame more to be shown and the grey scale pixel value G (M) of previous frame, to export corresponding comparison result value D (M+1).Dynamically recording unit 434 connects comparing unit 432 and overdrives and consult unit 450, in order to export the comparison result value D (M) that previous frame and the first two frame draw and to write down this corresponding comparison result value D (M+1).Overdrive and consult unit 450, be according to the grey scale pixel value G (M+1) of the comparison result value D (M) that is drawn in previous frame and the first two frame, frame to be shown and the grey scale pixel value G (M) of previous frame, the contrast three-dimensional look-up table 452 of overdriving is with the output gray-scale value God (M+1) that overdrives.
According to the comparison result value D (M) that previous frame grey scale pixel value G (M) and the first two frame grey scale pixel value G (M-1) are drawn, be the numerical value that the corresponding gray-scale value scope of gray scale difference value (G (M)-G (M-1)) for the grey scale pixel value G (M-1) of the grey scale pixel value G (M) that judges previous frame and the first two frame produces.For example be shown in Fig. 4 D, gray value interval [255,255] is divided into five gray-scale value scopes.I gray-scale value scope is [255 ,-128], and pairing D (M) value is 1, II gray-scale value scope is (128 ,-8), and pairing D (M) value is 2, III gray-scale value scope is [8,8], and pairing D (M) value is 0, IV gray-scale value scope is (8,128), pairing D (M) value is 3, and V gray-scale value scope is [128,255], pairing D (M) value is 4.
Please refer to Fig. 4 E, it illustrates according to the over-driving device structure calcspar that has the 4th kind of selected cell 430 of overdriving in the first embodiment of the invention.The selected cell 430 of overdriving comprises comparing unit 432, dynamically recording unit 434 and overdrives and consult unit 460 and select compensating unit 470.Comparing unit 432 is in order to the grey scale pixel value G (M+1) of frame more to be shown and the grey scale pixel value G (M) of previous frame, to export corresponding comparison result value D (M+1).
Dynamically recording unit 434 connects comparing unit 432 and selects compensating unit 470, in order to export the comparison result value D (M) that previous frame and the first two frame draw and to note down this corresponding comparison result value D (M+1).
Overdriving and consulting unit 460 is according to the grey scale pixel value G (M+1) of frame to be shown and the grey scale pixel value G (M) of previous frame, and the contrast static state look-up table 462 of overdriving is to export the static state gray-scale value Gs (M+1) that overdrives.Selecting 470 of compensating units is that basis is by the grey scale pixel value G (M+1) of the comparison result value D (M) that is drawn in previous frame and the first two frame, frame to be shown and the grey scale pixel value G (M) of previous frame, contrast Three-Dimensional Dynamic compensation look-up table 472, to draw dynamic compensation gray-scale value Gc (M+1), carry out the gray-scale value compensation in order to gray-scale value Gs (M+1) that static state is overdrived, and export the gray-scale value God (M+1) that overdrives according to this.God (M+1)=Gs (M+1)+Gc (M+1) wherein.
As above-mentioned, according to the comparison result value D (M) that the grey scale pixel value G (M-1) of the grey scale pixel value G (M) of previous frame and the first two frame is drawn, be the numerical value that the corresponding gray-scale value scope of gray scale difference value (G (M)-G (M-1)) for the grey scale pixel value G (M-1) of the grey scale pixel value G (M) that judges previous frame and the first two frame produces.
Please refer to Fig. 5, it illustrates the over-driving method process flow diagram according to first embodiment of the invention.
At first,, utilize the grey scale pixel value G (M) of previous frame of frame to be shown and the grey scale pixel value G (M-1) of the first two frame, draw corresponding comparison result value D (M) in step 500.
Then, in step 510, according to by the grey scale pixel value G (M+1) of the comparison result value D (M) that previous frame and the first two frame drew, frame to be shown and the grey scale pixel value G (M) of previous frame, contrast at least one look-up table of overdriving, obtaining the gray-scale value God (M+1) that overdrives, and process ends.
Please refer to Fig. 5 A, it illustrates first kind of thin portion process flow diagram of over-driving method among Fig. 5.
At first,, utilize the grey scale pixel value G (M) of previous frame of frame to be shown and the grey scale pixel value G (M-1) of the first two frame, draw corresponding comparison result value D (M) in step 500.As mentioned above, when the absolute difference of the grey scale pixel value G (M-1) of the grey scale pixel value G of previous frame (M) and the first two frame during less than critical gray scale difference x, comparison result value D (M) is 0, and D-(M) is 1.And when the absolute difference of grey scale pixel value G (M) and G (M-1) was not less than critical gray scale difference x, comparison result value D (M) was 1, and D-(M) is 0.
Then, carry out step 512, utilize the grey scale pixel value G (M+1) of frame to be shown and the grey scale pixel value G (M) of previous frame, and contrast the above-mentioned static state look-up table 435 of overdriving, to draw the static state gray-scale value Gs (M+1) that overdrives.
Carry out step 514, utilize the grey scale pixel value G (M+1) of frame to be shown and the grey scale pixel value G (M) of previous frame, and contrast the above-mentioned look-up table 437 of dynamically overdriving, to draw the gray-scale value Gd (M+1) that dynamically overdrives.
Continue step 516, utilize, must appear by comparison result value D (M), static state that the first two frame and previous frame drew overdrive the gray-scale value Gs (M+1) and the gray-scale value Gd (M+1) that dynamically overdrives
Drive gray-scale value God (M+1), wherein God (M+1)=D-(M) Gs (M+1)+D (M) Gd (M+1), and process ends.
Please refer to Fig. 5 B, it illustrates second kind of thin portion process flow diagram of over-driving method among Fig. 5.
At first,, utilize the grey scale pixel value G (M) of previous frame of frame to be shown and the grey scale pixel value G (M-1) of the first two frame, draw corresponding comparison result value D (M) in step 500.As mentioned above, when the absolute difference of grey scale pixel value G (M) and G (M-1) during less than critical gray scale difference x, comparison result value D (M) is 0.And when the absolute difference of grey scale pixel value G (M) and G (M-1) was not less than critical gray scale difference x, comparison result value D (M) was 1.
Then,, utilize the grey scale pixel value G (M+1) of frame to be shown and the grey scale pixel value G (M) of previous frame, contrast the above-mentioned static state look-up table 438 of overdriving, to draw the static state gray-scale value Gs (M+1) that overdrives in step 518.
Continue step 520, utilize the grey scale pixel value G (M+1) of frame to be shown and the grey scale pixel value G (M) of previous frame, contrast above-mentioned dynamic compensation look-up table 439, to draw dynamic compensation gray-scale value Gc (M+1).
At last, in step 522, utilization is by comparison result value D (M), static state that previous frame and the first two frame drew overdrive gray-scale value Gs (M+1) and dynamic compensation gray-scale value Gc (M+1), draw the gray-scale value God (M+1) that overdrives, wherein God (M+1)=Gs (M+1)+D (M) Gc (M+1).
Please refer to Fig. 5 C, it illustrates the third thin portion process flow diagram of over-driving method among Fig. 5.
At first,, utilize the grey scale pixel value G (M) of previous frame of frame to be shown and the grey scale pixel value G (M-1) of the first two frame, draw gray scale difference value (G (M)-G (M-1)) in step 502.
Then, in step 504,, judge corresponding gray-scale value scope, to draw comparison result value D (M) according to gray scale difference value (G (M)-G (M-1)).Shown in Fig. 4 D,, draw corresponding comparison result value D (M)=1,2,0,3,4 according to gray scale difference value (G (M)-G (M-1)) corresponding gray scale value scope I～V.
Continue step 524, utilization is by the grey scale pixel value G (M+1) of the comparison result value D (M) that previous frame and the first two frame drew, frame to be shown and the grey scale pixel value G (M) of previous frame, contrast the above-mentioned three-dimensional look-up table 452 of overdriving, obtaining the gray-scale value God (M+1) that overdrives, and process ends.
Please refer to Fig. 5 D, it illustrates the 4th kind of thin portion process flow diagram of over-driving method among Fig. 5.At first,, utilize the grey scale pixel value G (M) of previous frame of frame to be shown and the grey scale pixel value G (M-1) of the first two frame, draw gray scale difference value (G (M)-G (M-1)) in step 502.
Then, in step 504,, judge corresponding gray-scale value scope, to draw comparison result value D (M) according to gray scale difference value (G (M)-G (M-1)).Shown in Fig. 4 D,, draw corresponding comparison result value D (M)=1,2,0,3,4 according to gray scale difference value (G (M)-G (M-1)) corresponding gray scale value scope I～V.
Continue step 526, utilize the grey scale pixel value G (M+1) of frame to be shown and the grey scale pixel value G (M) of previous frame, contrast the above-mentioned static state look-up table 462 of overdriving, to draw the static state gray-scale value Gs (M+1) that overdrives.
Carry out step 528, according to comparison result value D (M) by previous frame and the first two frame drew, the grey scale pixel value G (M+1) of frame to be shown and the grey scale pixel value G (M) of previous frame, contrast Three-Dimensional Dynamic compensation meter 472 is to draw dynamic compensation gray-scale value Gc (M+1).
At last, in step 530, calculate the overdrive summation of gray-scale value Gs (M+1) and dynamic compensation gray-scale value Gc (M+1) of static state, to draw the gray-scale value God (M+1) that overdrives.Wherein when the absolute difference of grey scale pixel value G (M) and grey scale pixel value G (M-1) during less than critical gray scale difference x, dynamic compensation gray-scale value Gc (M+1) is to be zero.
Second embodiment:
Please refer to Fig. 6 A, it illustrates according to second embodiment of the invention over-driving device structure calcspar.The LCD that with the resolution is I * J is an example, over-driving device 600 is to receive corresponding (i, j) pixel in the grey scale pixel value G of (M+1) individual frame (M+1, i, j), and the corresponding (i of output according to this, j) pixel in the gray-scale value God that overdrives of (M+1) individual frame (M+1, i, j), wherein 1≤i≤I, and 1≤j≤J.Over-driving device 600 comprises storage unit 620 and overdrives and consult unit 630.Storage unit 620 be corresponding the in order to store (i, j) pixel in the grey scale pixel value G of (M+1) frame (M+1, i, j).The picture gray-scale value of M frame { G (M, i, j) | i=1～I, j=1～J} are stored in the frame memory 622, and the M-1 frame is to exist in another frame memory 624.Next (i, sign j) make the description of summary of the invention more succinct with regard to omitting.
Overdrive and consult unit 630 connection storage unit 620, in order to according to frame to be shown, for example be the grey scale pixel value G (M) of the grey scale pixel value G (M+1) of (M+1) frame, previous frame and the grey scale pixel value G (M-1) of the first two frame, the contrast three-dimensional look-up table 632 of overdriving is overdrived gray-scale value God (M+1) to display panels 640 with output.
Shown in Fig. 6 B, be example with 8 bits, the three-dimensional look-up table 632 of overdriving is 256 G (M-1) values (0～255) by X-axis, 256 G (M+1) values (0～255) institute construction of 256 G (M) values (0～255) of Y-axis and Z axle forms.(z) grey scale pixel value of representative frame to be shown is G (M+1) to each coordinate points for x, y, and the grey scale pixel value of previous frame and the first two frame is when being respectively G (M) and G (M-1), the needed gray-scale value of overdriving.
In addition, shown in Fig. 6 C, overdriving and consulting unit 630 also can be to comprise static over-drive unit 634 and dynamic compensation unit 636.Static over-drive unit 634 is according to the grey scale pixel value G (M+1) of frame to be shown and the grey scale pixel value G (M) of previous frame, and the contrast static state look-up table 635 of overdriving is to export the static state gray-scale value Gs (M+1) that overdrives.Dynamic compensation unit 636 is according to the grey scale pixel value G (M) of the grey scale pixel value G (M+1) of frame to be shown, previous frame and the grey scale pixel value G (M-1) of the first two frame, contrast Three-Dimensional Dynamic compensation look-up table 637, draw dynamic compensation gray-scale value Gc (M+1), in order to compensate the static state gray-scale value Gs (M+1) that overdrives, to export the required gray-scale value God (M+1) that overdrives (=Gs (M+1)+Gc (M+1)).The also similar above-mentioned Three-Dimensional Dynamic of Three-Dimensional Dynamic compensation look-up table 637 look-up table 632 of overdriving wherein, different is that Three-Dimensional Dynamic compensates each coordinate points (x of look-up table 637, y, z) grey scale pixel value of representative frame to be shown is G (M+1), and when the grey scale pixel value of previous frame and the first two frame is respectively G (M) and G (M-1), with respect to the overdrive gray-scale value size of the required compensation of gray-scale value Gs (M+1) of static state.
Please refer to Fig. 6 D, it illustrates according to second embodiment of the invention over-driving method process flow diagram.In step 600, according to the grey scale pixel value G (M) of the grey scale pixel value G (M+1) of frame to be shown, previous frame and the grey scale pixel value G (M-1) of the first two frame, the direct contrast three-dimensional look-up table 632 of overdriving, obtaining the required gray-scale value God (M+1) that overdrives, and process ends.
In addition, the over-driving method of second embodiment also can be shown in Fig. 6 E.
At first,,, contrast the above-mentioned static state look-up table 635 of overdriving, to obtain the static state gray-scale value Gs (M+1) that overdrives according to the grey scale pixel value G (M+1) of frame to be shown and the grey scale pixel value G (M) of previous frame in step 610.
Then, in step 620, according to the grey scale pixel value G (M) of the grey scale pixel value G (M+1) of frame to be shown, previous frame and the grey scale pixel value G (M-1) of the first two frame, contrast above-mentioned Three-Dimensional Dynamic compensation look-up table 637, to draw dynamic compensation gray-scale value Gc (M+1).
At last, in step 630, calculate the overdrive summation of gray-scale value Gs (M+1) and dynamic compensation gray-scale value Gc (M+1) of static state, to obtain the corresponding gray-scale value God (M+1) that overdrives.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.
Claims (28)
1. an over-driving device is applied to a display panels, in order to receiving a plurality of grey scale pixel values of a corresponding pixel in a plurality of frames, and exports a plurality of gray-scale values of overdriving according to this, it is characterized in that described over-driving device comprises:
One storage unit is in order to store more described grey scale pixel value; And
One selected cell of overdriving, connect described storage unit, in order to comparison according to the grey scale pixel value of pixel corresponding in the grey scale pixel value of corresponding described pixel in two frames before the described frame to be shown and the previous frame, select required at least one look-up table of overdriving, and according to the grey scale pixel value of corresponding described pixel in the grey scale pixel value of respective pixel in the described frame to be shown and the previous frame, contrast the selected described look-up table of overdriving, to export the described gray-scale value of overdriving.
2. over-driving device as claimed in claim 1 is characterized in that the described selected cell of overdriving also comprises:
One comparing unit in order to the grey scale pixel value of corresponding described pixel in the grey scale pixel value of corresponding described pixel in two frames before the described frame more to be shown and the previous frame, and is exported a comparison result value of corresponding described pixel;
One dynamically recording unit, connect described comparing unit, draw the comparison result value of corresponding described pixel in order to output according to previous frame and the first two frame, and write down according to the described frame to be shown and the comparison result value of corresponding described pixel that previous frame draws; And
One selects to consult the unit, connect described dynamically recording unit, in order to the grey scale pixel value that utilizes described frame to be shown and the grey scale pixel value of previous frame, contrast the static state look-up table of overdriving, draw overdrive gray-scale value and contrast the look-up table of dynamically overdriving of a static state, draw the gray-scale value of dynamically overdriving, and according to the described comparison result value that draws by previous frame and the first two frame, select described static state overdrive gray-scale value or the described gray-scale value of dynamically overdriving, and be output as the described gray-scale value of overdriving.
3. over-driving device as claimed in claim 2, it is characterized in that described selection consult the unit be according to described comparison result value show corresponding described pixel in the first two frame grey scale pixel value and previous frame in the grey scale pixel value of corresponding described pixel when being identical, select the described static state of the contrast look-up table of overdriving, draw the described static state gray-scale value of overdriving, to be output as the described gray-scale value of overdriving.
4. over-driving device as claimed in claim 3, it is characterized in that the described selected cell of overdriving be the grey scale pixel value that shows corresponding described pixel in the first two frame according to described comparison result value with previous frame in the grey scale pixel value of corresponding described pixel for not simultaneously, select the described look-up table of dynamically overdriving of contrast, draw the described gray-scale value of dynamically overdriving, to be output as the described gray-scale value of overdriving.
5. over-driving device as claimed in claim 1 is characterized in that the described selected cell of overdriving also comprises:
One comparing unit in order to the grey scale pixel value of corresponding described pixel in the grey scale pixel value of corresponding described pixel in the described frame more to be shown and the previous frame, and is exported a comparison result value of corresponding described pixel;
One dynamically recording unit, connect described comparing unit, draw the comparison result value of corresponding described pixel in order to output according to previous frame and the first two frame, and write down according to the described frame to be shown and the comparison result value of corresponding described pixel that previous frame draws;
One overdrives consults the unit, in order to the grey scale pixel value according to corresponding described pixel in the grey scale pixel value of corresponding described pixel in the described frame to be shown and the previous frame, contrasts the static state look-up table of overdriving, to export the static state gray-scale value of overdriving; And
One selects compensating unit, connect described dynamically recording unit, in order to comparison result value according to the corresponding described pixel that draws in previous frame and the first two frame, and according to a dynamic compensation look-up table, the described static state gray-scale value of overdriving is carried out gray-scale value compensation, and export the described gray-scale value of overdriving according to this.
6. over-driving device as claimed in claim 5, it is characterized in that described selection compensating unit be the grey scale pixel value that shows corresponding described pixel in the first two frame according to described comparison result value with previous frame in the grey scale pixel value of corresponding described pixel when being identical, directly export the overdrive gray-scale value of described static compensation gray-scale value as correspondence.
7. over-driving device as claimed in claim 6, it is characterized in that described selection compensating unit be the grey scale pixel value that shows corresponding described pixel in the first two frame according to described comparison result value with previous frame in the grey scale pixel value of corresponding described pixel for not simultaneously, select the described dynamic compensation look-up table of contrast, and according to the grey scale pixel value of corresponding described pixel in the grey scale pixel value of respective pixel in the described frame to be shown and the previous frame, to draw a dynamic compensation gray-scale value, compensate the described static state gray-scale value of overdriving, to export the described gray-scale value of overdriving.
8. over-driving device as claimed in claim 1 is characterized in that the described selected cell of overdriving also comprises:
One comparing unit in order to the grey scale pixel value of corresponding described pixel in the grey scale pixel value of corresponding described pixel in two frames before the described frame more to be shown and the previous frame, and is exported a comparison result value of corresponding described pixel;
One dynamically recording unit, connect described comparing unit, draw the comparison result value of corresponding described pixel in order to output according to previous frame and the first two frame, and write down according to the described frame to be shown and the comparison result value of corresponding described pixel that previous frame draws; And
One overdrives consults the unit, connect described dynamically recording unit, in order to grey scale pixel value according to corresponding described pixel in the grey scale pixel value of corresponding described pixel in the comparison result value of the corresponding described pixel that draws in previous frame and the first two frame, the described frame to be shown and the previous frame, contrast the three-dimensional look-up table of overdriving, to export the described gray-scale value of overdriving.
9. over-driving device as claimed in claim 1, it is characterized in that described according to the previous frame and the comparison result value of corresponding described pixel that the first two frame draws be a gray scale difference value by the grey scale pixel value of corresponding described pixel in the grey scale pixel value of judging corresponding described pixel in the first two frame and the previous frame fall within a gray-scale value scope a numerical value of corresponding generation.
10. over-driving device as claimed in claim 1 is characterized in that the described selected cell of overdriving also comprises:
One comparing unit in order to the grey scale pixel value of corresponding described pixel in the grey scale pixel value of corresponding described pixel in the described frame more to be shown and the previous frame, and is exported a comparison result value of corresponding described pixel;
One dynamically recording unit, connect described comparing unit, draw the comparison result value of corresponding described pixel in order to output according to previous frame and the first two frame, and write down according to the described frame to be shown and the comparison result value of corresponding described pixel that previous frame draws;
One overdrives consults the unit, in order to the grey scale pixel value according to corresponding described pixel in the grey scale pixel value of corresponding described pixel in the described frame to be shown and the previous frame, contrasts the static state look-up table of overdriving, to export the static state gray-scale value of overdriving; And
One selects compensating unit, connect described dynamically recording unit, in order to grey scale pixel value according to corresponding described pixel in the grey scale pixel value of corresponding described pixel in the comparison result value of the corresponding described pixel that draws in previous frame and the first two frame, the described frame to be shown and the previous frame, contrast Three-Dimensional Dynamic compensation look-up table, to draw a dynamic compensation gray-scale value, carry out the gray-scale value compensation in order to gray-scale value that described static state is overdrived, and export the described gray-scale value of overdriving according to this.
11. over-driving device as claimed in claim 1, it is characterized in that described according to the previous frame and the comparison result value of corresponding described pixel that the first two frame draws be a gray scale difference value by the grey scale pixel value of corresponding described pixel in the grey scale pixel value of judging corresponding described pixel in the first two frame and the previous frame fall within a gray-scale value scope a numerical value of corresponding generation.
12. an over-driving device is applied to a display panels, in order to receiving a plurality of grey scale pixel values of a corresponding pixel in a plurality of frames, and exports a plurality of gray-scale values of overdriving according to this, it is characterized in that described over-driving device comprises:
One storage unit is in order to store more described grey scale pixel value; And
One overdrives consults the unit, connect described storage unit, in order to grey scale pixel value according to corresponding described pixel in the grey scale pixel value of corresponding described pixel in the grey scale pixel value of corresponding described pixel in the described frame to be shown, the previous frame and the first two frame, contrast at least one look-up table of overdriving, to export the described gray-scale value of overdriving.
13. over-driving device as claimed in claim 12, it is characterized in that describedly overdriving that to consult the unit be grey scale pixel value according to corresponding described pixel in the grey scale pixel value of corresponding described pixel in the grey scale pixel value of corresponding described pixel in the described frame to be shown, the previous frame and the first two frame, contrast the three-dimensional look-up table of overdriving, to export the described gray-scale value of overdriving.
14. over-driving device as claimed in claim 12 is characterized in that described overdriving consult the unit and comprise:
One static over-drive unit in order to the grey scale pixel value according to corresponding described pixel in the grey scale pixel value of corresponding described pixel in the described frame to be shown and the previous frame, contrasts the static state look-up table of overdriving, to export the static state gray-scale value of overdriving; And
One dynamic compensation unit, in order to grey scale pixel value according to corresponding described pixel in the grey scale pixel value of corresponding described pixel in the grey scale pixel value of corresponding described pixel in the described frame to be shown, the previous frame and the first two frame, contrast Three-Dimensional Dynamic compensation look-up table, draw a dynamic compensation gray-scale value, compensate the described static state gray-scale value of overdriving, to export the required described gray-scale value of overdriving.
15. an over-driving method is applied to a display panels, in order to the grey scale pixel value according to a corresponding pixel in the frame to be shown, draws the gray-scale value of overdriving, described over-driving method comprises:
(a) utilize the grey scale pixel value of corresponding described pixel in the grey scale pixel value of corresponding described pixel in the previous frame of described frame to be shown and the first two frame, draw a comparison result value of corresponding described pixel; And
(b) according to grey scale pixel value by corresponding described pixel in the grey scale pixel value of corresponding described pixel in the comparison result value of previous frame and corresponding described pixel that the first two frame draws, the described frame to be shown and the previous frame, contrast at least one look-up table of overdriving, to obtain the described gray-scale value of overdriving.
16. over-driving method as claimed in claim 15 is characterized in that described step (b) also comprises:
(b-1) utilize the grey scale pixel value of corresponding described pixel in the grey scale pixel value of corresponding described pixel in the described frame to be shown and the previous frame, and contrast the static state look-up table of overdriving, to draw the static state gray-scale value of overdriving;
(b-2) utilize the grey scale pixel value of corresponding described pixel in the grey scale pixel value of corresponding described pixel in the described frame to be shown and the previous frame, and contrast the look-up table of dynamically overdriving, to draw the gray-scale value of dynamically overdriving; And
(b-3) utilize according to the comparison result value of previous frame and corresponding described pixel that the first two frame draws, described static state overdrive gray-scale value and the described gray-scale value of dynamically overdriving, draw the described gray-scale value of overdriving.
17. over-driving method as claimed in claim 16, it is characterized in that described when corresponding described pixel in the previous frame grey scale pixel value and the first two frame in the absolute difference of grey scale pixel value of corresponding described pixel during less than a critical gray scale difference, the described gray-scale value of overdriving is to be the described static state gray-scale value of overdriving.
18. over-driving method as claimed in claim 17, it is characterized in that described when corresponding described pixel in the previous frame grey scale pixel value and the first two frame in the absolute difference of grey scale pixel value of corresponding described pixel when being not less than described critical gray scale difference, the described gray-scale value of overdriving is to be the described gray-scale value of dynamically overdriving.
19. over-driving method as claimed in claim 15 is characterized in that described step (b) also comprises:
(b-1) utilize the grey scale pixel value of corresponding described pixel in the grey scale pixel value of corresponding described pixel in the described frame to be shown and the previous frame, contrast the static state look-up table of overdriving, to draw the static state gray-scale value of overdriving;
(b-2) utilize the grey scale pixel value of corresponding described pixel in the grey scale pixel value of corresponding described pixel in the described frame to be shown and the previous frame, contrast a dynamic compensation look-up table, to draw a dynamic compensation gray-scale value; And
(b-3) utilize according to the comparison result value of previous frame and corresponding described pixel that the first two frame draws, described static state overdrive gray-scale value and described dynamic compensation gray-scale value, draw the described gray-scale value of overdriving.
20. over-driving method as claimed in claim 19, it is characterized in that described when corresponding described pixel in the previous frame grey scale pixel value and the first two frame in the absolute difference of grey scale pixel value of corresponding described pixel during less than a critical gray scale difference, the described gray-scale value of overdriving is to be the described static state gray-scale value of overdriving.
21. over-driving method as claimed in claim 20, it is characterized in that described when corresponding described pixel in the previous frame grey scale pixel value and the first two frame in the absolute difference of grey scale pixel value of corresponding described pixel when being not less than described critical gray scale difference, the described gray-scale value of overdriving is to be the overdrive summation of gray-scale value and described dynamic compensation gray-scale value of described static state.
22. over-driving method as claimed in claim 15 is characterized in that described step (a) also comprises:
(a-1) utilize the grey scale pixel value of corresponding described pixel in the grey scale pixel value of corresponding described pixel in the previous frame of described frame to be shown and the first two frame, draw a gray scale difference value; And
(a-2) judge a corresponding gray-scale value scope according to described gray scale difference value, to draw described comparison result value.
23. over-driving method as claimed in claim 22 is characterized in that described step (b) also comprises:
(b-1) utilize the grey scale pixel value of corresponding described pixel in the grey scale pixel value of corresponding described pixel in comparison result value according to previous frame and corresponding described pixel that the first two frame draws, the described frame to be shown and the previous frame, contrast the three-dimensional look-up table of overdriving, to obtain the described gray-scale value of overdriving.
24. over-driving method as claimed in claim 22 is characterized in that described step (b) also comprises:
(b-1) utilize the grey scale pixel value of corresponding described pixel in the grey scale pixel value of corresponding described pixel in the described frame to be shown and the previous frame, contrast the static state look-up table of overdriving, to draw the static state gray-scale value of overdriving;
(b-2) according to grey scale pixel value by corresponding described pixel in the grey scale pixel value of corresponding described pixel in the comparison result value of previous frame and corresponding described pixel that the first two frame draws, the described frame to be shown and the previous frame, contrast a Three-Dimensional Dynamic compensation meter, to draw a dynamic compensation gray-scale value; And
(b-3) calculate the overdrive summation of gray-scale value and described dynamic compensation gray-scale value of described static state, to draw the described gray-scale value of overdriving.
25. over-driving method as claimed in claim 24, it is characterized in that described when corresponding described pixel in the previous frame grey scale pixel value and the first two frame in the absolute difference of grey scale pixel value of corresponding described pixel during less than a critical gray scale difference, described dynamic compensation gray-scale value is to be zero.
26. an over-driving method is applied to a display panels, in order to the grey scale pixel value according to a corresponding pixel in the frame to be shown, draws the gray-scale value of overdriving, and it is characterized in that described over-driving method comprises:
(a) according to the grey scale pixel value of corresponding described pixel in the grey scale pixel value of corresponding described pixel in the grey scale pixel value of corresponding described pixel in the described frame to be shown, the previous frame and the first two frame, contrast at least one look-up table of overdriving, to obtain the described gray-scale value of overdriving.
27. over-driving method as claimed in claim 26, it is characterized in that described step (a) also comprises the grey scale pixel value according to corresponding described pixel in the grey scale pixel value of corresponding described pixel in the grey scale pixel value of corresponding described pixel in the described frame to be shown, the previous frame and the first two frame, contrast the three-dimensional look-up table of overdriving, to export the described gray-scale value of overdriving.
28. over-driving method as claimed in claim 26 is characterized in that described step (a) also comprises:
(a-1), contrast the static state look-up table of overdriving, to obtain the static state gray-scale value of overdriving according to the grey scale pixel value of corresponding described pixel in the grey scale pixel value of corresponding described pixel in the described frame to be shown and the previous frame;
(a-2) according to the grey scale pixel value of corresponding described pixel in the grey scale pixel value of corresponding described pixel in the grey scale pixel value of corresponding described pixel in the described frame to be shown, the previous frame and the first two frame, contrast Three-Dimensional Dynamic compensation look-up table, to draw a dynamic compensation gray-scale value; And
(a-3) calculate the overdrive summation of gray-scale value and described dynamic compensation gray-scale value of described static state, to obtain the corresponding described gray-scale value of overdriving.
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