CN103137076A - Bi-stable state display device, and drive circuit and drive method thereof - Google Patents
Bi-stable state display device, and drive circuit and drive method thereof Download PDFInfo
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Abstract
The invention provides a bi-stable state display device which has an image rendering function, and a drive circuit and a drive method thereof. Source image information is converted to a plurality of independent pulse driving waveforms through pulse-width modulation (PWM) treatment, and then image rendering operation is carried out on the pulse count of the wave files. When the image rendering operation is carried out on the pulse count, for a refreshed frame, only a wave form of a refreshed part needs to be recorded for reset, the whole original gray scale does not need to be recorded, and therefore hardware requirements for the driving integrated circuit (IC) are reduced. Furthermore, the plurality of independent pulse driving waveforms converted from the source image information through the PWM treatment exist in a truth table form, and therefore integration is convenient.
Description
Technical field
The present invention relates to the bistable display technologies field, particularly a kind of have e-book driving circuit and the driving method of image rendering function and comprise this driving circuit, use the e-book of this driving method.
Background technology
Image rendering (Graphics Rendering) technology based on the colour element system is a branch field of graphics.The multiple rendering intent that has been born in this field, a kind of rendering intent can be understood as a mapping from the source image information to the target image information.The primary image of this mapping is the cover source image information based on a source pixel system; The primary image of this mapping (result that namely should shine upon) is the cover target image information based on an object pixel system.Here, source pixel system and object pixel system can be same systems, also can be different.Different rendering intents can be in order to adapt to different pixel system conversion, can be also in order to realize certain special display effect in same pixel system, so its mapping mode to information (being concrete mapping) is also different.In this patent, the mapping mode (i.e. the mapping of this image rendering method) that a kind of image rendering method is used is designated as f; A certain source image information is played up operation f refer to the target image information that this source image information employing mapping mode f (namely shining upon f) is obtained correspondence.
Image rendering (Graphics Rendering) technology has a wide range of applications in the demonstration field.For example, in field of liquid crystal display, a kind of well-known image rendering technology is arranged: the pentile technology.A kind of widely well-known pentile technology is PenTile RGBW, is about to image information based on RGB three color pixel systems and is transformed into image information based on RGBW four sub-pixels systems.The mapping that PenTile RGBW is corresponding is designated as fRGBW, and purpose is that the image information that originally showed in RGB three color pixel systems is carried out conversion, makes the image information after conversion to show in RGBW four sub-pixels systems.Its source pixel system is exactly RGB three sub-pixels systems, and the object pixel system is RGBW four sub-pixels systems.It is all problems of broad research of an industrial community and academia that RGB turns RGBW, there be different pursuing a goal in different research institutions for producing W GTG value, some pursuit high brightness, some pursuits do not affect excitation, even so identical source image information, also may draw the W GTG value of different target image information, the GTG value of other RGB three looks also may be different thereupon.
So for the mapping f of some image renderings arbitrarily, its source pixel system can be the same with the object pixel system, can be also different.Such as source pixel system and the object pixel system of aforementioned fpen and fRGBW is exactly different, again such as anti-sawtooth operation (anti aliasing), the dynamic fuzzy filter (motion blur filter) etc. of field of Computer Graphics, be exactly all the time based on RGB three color pixel systems.
Also has the image rendering technology of a kind of being referred to as " dynamic pixel " or " virtual pixel " (referring to patent documentation AU199883142B2 in the flat pannel display field, CN1221940A, US6661429B1), referred to as VP (virtual pixel) technology, corresponding mapping is designated as fVP.The source pixel system of fVP can be any pixel system, the object pixel system can be that a resolution is source pixel system 1/4, the equal-sized pixel system of a complete pixel of each sub-pixel size and source pixel system (being made of a plurality of sub-pixels in the source pixel system).The color of each target sub-pixel is wherein a kind of or this a kind of color that is mixed into arbitrary proportion of R, G, B, such as white W, and perhaps yellow Y.The GTG value of any one target sub-pixel need to embody " dynamic pixel " this concept, namely this target sub-pixel, need simultaneously other three sub-pixels upper left with it respectively, three sub-pixels of other of lower left, top-right other three sub-pixels, bottom-right other three sub-pixel complete pixels, namely 4 complete pixel share this target sub-pixel, and this target sub-pixel dynamically participates in the structure and demonstration of these 4 complete pixel.For instance, as shown in Figure 1, the source pixel system of VP technology is traditional RGB three sub-pixels systems, and each pixel consists of by the sub-pixel of R, G, three kinds of colors of B that (Fig. 1 a); The object pixel system of VP technology is traditional RGBW four sub-pixels systems, and each pixel consists of (Fig. 1 b) by the sub-pixel of R, G, B, four kinds of colors of W; Wherein, the size of a sub-pixel of the object pixel system of VP technology equals the size of a pixel of source pixel system.After the color of certain target sub-pixel was determined, the sub-pixel that participates in its GTG calculating in the source pixel system had just been determined.(red sub-pixel is as shown in Fig. 1 b) is example with the R sub-pixel in object pixel, and pixel identical with its position in the source pixel system is designated as P, and pixel P equates with this R sub-pixel size; In the source pixel system, 4 of the upper and lower, left and right neighbor of pixel P is distinguished very P
11, P
12, P
13, P
14In the source pixel system, the upper left of pixel P, lower-left, upper right, the oblique neighbor in 4 of bottom rights are distinguished very P
21, P
22, P
23, P
24The sub-pixel that participates in so this R sub-pixel GTG calculating in the source pixel system is respectively: the red sub-pixel in pixel P (its GTG value is the r shown in Fig. 1 a), pixel P
11, P
12, P
13, P
14In red sub-pixel (its GTG value is respectively the r shown in Fig. 1 a
11, r
12, r
13, r
14), pixel P
21, P
22, P
23, P
24In red sub-pixel (its GTG value is respectively the r shown in Fig. 1 a
21, r
22, r
23, r
24).The GTG value R ' of this R sub-pixel can calculate according to following formula so: R '=A*r+B* (r
11+ r
12+ r
13+ r
14)+C* (r
21+ r
22+ r
23+ r
24), wherein A, B, C are weight parameter, and A+4B+4C=1 is arranged.So, the red sub-pixel gray level information at same position place in the gray level information band active pixel system of this R sub-pixel in the object pixel system; The red sub-pixel gray level information of the neighbor of the red sub-pixel gray level information of 4 neighbors in upper and lower, left and right and upper left, lower-left, upper right, 4 the oblique directions in bottom right.When showing image like this in the object pixel system this R sub-pixel dynamically respectively three sub-pixels of GBW upper left with it consist of pixel P '
1, three sub-pixels of GBW top-right with it consist of pixel P '
2, consist of pixel P ' with three sub-pixels of the GBW of its lower left
3, three sub-pixels of GBW bottom-right with it consist of pixel P '
4The occasion lower to some degree of accuracy can make C=0.Aforementioned R sub-pixel in object pixel is example, for other color sub-pixels in object pixel, is also in like manner, is not repeated at this.
In prior art, image rendering (Graphics Rendering) technology is applied in display device is all generally first source image information to be carried out the image rendering operation, convert target image information to, and then this target image information is input to according to prior art carries out image in bistable display and show.Fig. 2 is the middle signal processing flow figure of bi-stable display device (for example e-book) that has image rendering (Graphics Rendering) function in prior art.As can be seen from Figure 2, source image information (based on the source pixel system) is first passed through image rendering, converts target image information (based target pixel system) to; Then target image information converts pulse waveform to through pulse-length modulation (PWM) and exports to this bistable display (having the object pixel system).Source image information is based on the gray level information that exists in digital form of former pixel system, through converting the gray level information that exists in digital form of based target pixel system after image rendering to, the pulse waveform of output is to table look-up in the middle of the waveform library according to the GTG signal of target image information to choose after pulse-length modulation (PWM), and in this pulse waveform, the number of times of height pulse has determined the GTG of pixel in the bistable display.For refresh frame, in the bi-stable display device of prior art, image rendering method will record whole original GTG, and is higher to the hardware requirement of drive IC; The mapping f of image rendering is as an algorithm in addition, and numerous parameters are absolutely necessary therein, and f calculates the very strong algorithm of character as one, and a lot of parameters can be all the change parameters but not decide parameter.In the design of IC firmware, parameter generally can be presented as the resistance value ratio of some outer meeting resistances in amplifying circuit, decide parameter this moment and can be easy to design, what become parameter realizes very large of difficulty, no matter be adopt the interior integrated rheostat of IC or adopt the modes that the resistance scheme covers of deciding more, be all extremely to take chip area.And in IC industry, area is the first key element of considering.So use the integrated comparatively difficulty of driving circuit of the bi-stable display device of image rendering (Graphics Rendering) technology in prior art.
Summary of the invention
The technical problem to be solved in the present invention be use in prior art image rendering (Graphics Rendering) technology bi-stable display device driving circuit to hardware require high, integrated comparatively the difficulty.
For addressing the above problem, the embodiment of the present invention one provides a kind of driving circuit, is used for driving this bistable display, it is characterized in that, described driving circuit comprises:
Pwm unit is tabled look-up in the middle of the waveform library according to source image information and is chosen the source pulse waveform;
Impulse meter is counted the refresh pulse number of output source pulse waveform to the pulse in described source pulse waveform of rushing width modulation unit output;
Operation is played up to the refresh pulse number of described impulse meter output in the image rendering unit, obtains the refresh pulse number of target pulse waveform;
The refresh pulse number register is stored the current refresh pulse number of described image rendering unit output and exports former frame refresh pulse number;
Refresh/reset the truth table register, storage refreshes/resets truth table, and retrieves this according to the former frame refresh pulse number of described image rendering unit output and refresh/reset the current reset pulse number of truth table acquisition;
The waveform maker generates according to current refresh pulse number and the described current reset pulse number that refreshes/reset the output of truth table register of described image rendering unit output the target pulse waveform that is used for described driving bistable display.
Preferably, the refresh pulse number of described source pulse waveform comprises that main refresh pulse is counted pq3 and the concussion refresh pulse is counted pq4.
Preferably, the described image rendering technology that is operating as " dynamic pixel " of playing up.Wherein, if driving the waveform of current pixel in the object pixel system is p ', the source pulse waveform that in drive source pixel system, each pixel P, P11, P12, P13, P14, P21, P22, P23, the P24 corresponding with described current pixel needs respectively is p, p11, p12, p13, p14, p21, p22, p23, p24, has
p′·q3＝INT[A*p·q3+B*(p11·q3+p12·q3+p13·q3+p14·q3)+C*(p21·q3+p22·q3+p23·q3+p24·q3)]，
p′·q4＝INT[A*p·q4+B*(p11·q4+p12·q4+p13·q4+p14·q4)+C*(p21·q4+p22·q4+p23·q4+p24·q4)]；
Wherein, A, B, C are weight parameter, and A+4B+4C=1 is arranged; Pq3, p11q3, p12q3, p13q3, p14q3, p21q3, p22q3, p23q3, p24q3 are respectively the main refresh pulse number of source pulse waveform p, p11, p12, p13, p14, p21, p22, p23, p24; Pq3, p11q3, p12q3, p13q3, p14q3, p21q3, p22q3, p23q3, p24q3 are respectively the concussion refresh pulse number of source pulse waveform p, p11, p12, p13, p14, p21, p22, p23, p24.Preferably, make C=0.
Preferably, described image rendering unit is also counted p ' q3 and concussion refresh pulse to main refresh pulse and is counted p ' q4 and carry out normalizing operation, obtains that standard master refresh pulse is counted p ' q3 ' and standard concussion refresh pulse is counted p ' q4 '.
The embodiment of the present invention two also provides a kind of driving circuit, is used for driving this bistable display, it is characterized in that, described driving circuit comprises:
Pwm unit is tabled look-up in the middle of the waveform library according to source image information and is chosen the source pulse waveform;
The unit is stored and searched to truth table, search current target pulse waveform according to the source pulse waveform of described pwm unit output and the target pulse waveform of former frame in truth table, and should export described bistable display to by current target pulse waveform, in order to drive described bistable display.
Preferably, in embodiment one and embodiment two, bistable display can be Electronic Paper.
The present invention also provides a kind of bi-stable display device, comprises bistable display and embodiment one what described driving circuit of embodiment two.
The present invention also provides a kind of driving method of bi-stable display device, comprises the steps:
Step S100: choose the source pulse waveform according to source image information
Step S200: the pulse in the pulse waveform of described source is counted;
Step S300: described refresh pulse number is played up operation, obtain the refresh pulse number of target pulse waveform;
Step S400: obtain current reset pulse number according to former frame refresh pulse number, generate the target pulse waveform according to current reset pulse number and current refresh pulse number;
Step S500: with described target pulse drive waveform bistable display.
Preferably, the refresh pulse number of described source pulse waveform comprises that main refresh pulse is counted pq3 and the concussion refresh pulse is counted pq4.
Preferably, the described image rendering technology that is operating as " dynamic pixel " of playing up.Wherein, if driving the waveform of current pixel in the object pixel system is p ', the source pulse waveform that in drive source pixel system, each pixel P, P11, P12, P13, P14, P21, P22, P23, the P24 corresponding with described current pixel needs respectively is p, p11, p12, p13, p14, p21, p22, p23, p24, has
p′·q3＝INT[A*p·q3+B*(p11·q3+p12·q3+p13·q3+p14·q3)+C*(p21·q3+p22·q3+p23·q3+p24·q3)]，
p′·q4＝INT[A*p·q4+B*(p11·q4+p12·q4+p13·q4+p14·q4)+C*(p21·q4+p22·q4+p23·q4+p24·q4)]；
Wherein, A, B, C are weight parameter, and A+4B+4C=1 is arranged; Pq3, p11q3, p12q3, p13q3, p14q3, p21q3, p22q3, p23q3, p24q3 are respectively the main refresh pulse number of source pulse waveform p, p11, p12, p13, p14, p21, p22, p23, p24; Pq3, p11q3, p12q3, p13q3, p14q3, p21q3, p22q3, p23q3, p24q3 are respectively the concussion refresh pulse number of source pulse waveform p, p11, p12, p13, p14, p21, p22, p23, p24.Preferably, make C=0.
Preferably, described image rendering unit is also counted p ' q3 and concussion refresh pulse to main refresh pulse and is counted p ' q4 and carry out normalizing operation, obtains that standard master refresh pulse is counted p ' q3 ' and standard concussion refresh pulse is counted p ' q4 '.
Compared with prior art, bi-stable display device and driving circuit and driving method with image rendering function provided by the present invention, after first processing is converted to some independent pulsed drive waveforms through PWM with source image information, then the umber of pulse of these wave files is carried out the image rendering operation.Wherein, when number of pulses is carried out the image rendering operation, for refresh frame, only need record to refresh portion waveshape for resetting, do not need to record whole original GTG, reduced the hardware requirement to drive IC.In addition, the present invention first passes through source image information and all exists with truth-table format after the PWM processing is converted to some independent pulsed drive waveforms, is convenient to integrated.
Description of drawings
Fig. 1 is RGB source pixel system and the RGBW object pixel system schematic diagram of existing VP technology;
Fig. 2 has signal processing flow figure in the bi-stable display device of image rendering function in prior art;
Fig. 3 is the structured flowchart of the bi-stable display device that provides of the embodiment of the present invention one;
Fig. 4 is the timing chart of an e-book drive waveforms;
Fig. 5 is brightness-GTG coordinate diagram;
Fig. 6 refreshes/resets to store in the truth table register to refresh/reset the truth table structural representation;
Fig. 7 is the structured flowchart of the bi-stable display device that provides of the embodiment of the present invention two;
Fig. 8 is the driving method process flow diagram of the bi-stable display device that provides of the embodiment of the present invention three.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
In prior art, image rendering (Graphics Rendering) technology is applied in display device is all generally first source image information to be carried out the image rendering operation, convert target image information to, and then this target image information is input to according to prior art carries out image in bistable display and show.For refresh frame, in the bi-stable display device of prior art, image rendering method will record whole original GTG, and is higher to the hardware requirement of drive IC; The mapping f of image rendering calculates the very strong algorithm of character as one in addition, has a lot of change parameters.In the design of IC firmware, parameter generally can be presented as the resistance value ratio of some outer meeting resistances in amplifying circuit, decide parameter this moment and can be easy to design, what become parameter realizes very large of difficulty, no matter be adopt the interior integrated rheostat of IC or adopt the modes that the resistance scheme covers of deciding more, be all extremely to take chip area.And in IC industry, area is the first key element of considering.So use the integrated comparatively difficulty of driving circuit of the bi-stable display device of image rendering (Graphics Rendering) technology in prior art.
For the problems referred to above, the invention provides a kind of bi-stable display device and driving circuit and driving method with image rendering function, after first processing is converted to some independent pulsed drive waveforms through PWM with source image information, then the umber of pulse of these wave files is carried out the image rendering operation.Wherein, when number of pulses is carried out the image rendering operation, for refresh frame, only need record to refresh portion waveshape for resetting, do not need to record whole original GTG, reduced the hardware requirement to drive IC.In addition, the present invention first passes through source image information and all exists with truth-table format after the PWM processing is converted to some independent pulsed drive waveforms, is convenient to integrated.
Embodiment one
The structured flowchart of the bi-stable display device 10 that Fig. 3 provides for the embodiment of the present invention one.As can be seen from Figure 3, bi-stable display device 10 comprises bistable display 7 and the driving circuit 8 that drives signal (being pulse waveform) is provided for this bistable display 7.Driving circuit 8 converts the source image information of input target image information to and the pulse waveform that comprises target image information is provided to bistable display 7, to drive this bistable display 7 work.
As can be seen from Figure 3, driving circuit 8 comprises: pulse-length modulation (PWM) unit 1, impulse meter 2, image rendering unit 3, refresh pulse number register 5, refresh/reset truth table register 6, waveform maker 4.
The source image information that pulse-length modulation (PWM) unit 1 consists of according to the GTG signal by numeral is tabled look-up in the middle of the waveform library and is chosen pulse waveform (source pulse waveform) and output, and in the pulse waveform of source, the number of times of height pulse determines the GTG of pixel.
The pulse that impulse meter 2 liquidates in the source pulse waveform of width modulated (PWM) unit 1 output is counted.Fig. 4 shows the timing chart of an e-book drive waveforms.As we can see from the figure, a complete waveform is made of 4 parts.At first be the master reset part, a series of continuous positive or negative pulses change to current GTG be near the mark most black or standard white, are then to shake the part that resets, and apply a string concussion pulse, and the GTG accurate adjustment is arrived the standard GTG.This is also the hysteretic characteristic that has utilized bistable state to drive in fact.The main part that refreshes thereafter, a series of continuous impulses with pixel driver near target gray scale.Being that concussion refreshes part at last, is also a string concussion pulse, and fine adjustment is to target gray scale.From the above, pulse waveform is determined the gray scale variation from last GTG to a rear GTG, the means that adopt not are a GTG after directly becoming from last GTG, but a black process that resets or reset has in vain been passed through in the centre, and doing like this is in order to prevent the accumulation of display error.In addition, bi-stable pixels is applied the effect that a positive pulse causes, be not equal to the minus effect that applies a negative pulse.In other words, after pixel is applied a positive pulse, then apply a negative pulse, pixel can't be got back to GTG originally, but difference slightly, the hysteretic characteristic that bistable state that Here it is drives.Here, impulse meter 2 is exported to the next stage circuit with the refresh pulse number (comprising that main refresh pulse is counted pq3 and the concussion refresh pulse is counted pq4) of each source pulse waveform p.
The refresh pulse number of image rendering unit 3 pulse count devices 2 outputs (comprising that main refresh pulse is counted pq3 and the concussion refresh pulse is counted pq4) is played up operation f ', and (main refresh pulse counts p ' q3 and the concussion refresh pulse is counted p ' q4) to obtain the refresh pulse number of the target pulse waveform p ' of based target pixel system.
It has following characteristic image rendering f ': for known algorithm f, if produce target image information after source image information process f conversion, then pass through pulse-length modulation (PWM) output, can produce visual effect 1.If after the one group of waveform process f ' processing after source image information is processed through pulse-length modulation (PWM) simultaneously, output can produce visual effect 2, visual effect 1 and visual effect 2 is the same.
How the particular content of image rendering f ' in other words, produces this transformation relation, number of ways can be arranged.Can be one group of pre-set condition choice relation, can be that some eigenwerts (such as umber of pulse, pulse direction etc.) of overlapping according to sample waveform draw do computing.
The below illustrates image rendering f ' vp and how to produce take image rendering fvp shown in Figure 1 as example.
By Fig. 1 and explanation thereof as can be known: the GTG value R ' of R sub-pixel can calculate according to following formula: R '=A*r+B* (r
11+ r
12+ r
13+ r
14)+C* (r
21+ r
22+ r
23+ r
24), wherein A, B, C are weight parameter, and A+4B+4C=1 is arranged.G sub-pixel and sub-pixel B are in like manner.If if at the source pixel image under the effect of pulse-length modulation (PWM), the source pulse waveform that driving each pixel P shown in Figure 1, P11, P12, P13, P14, P21, P22, P23, P24 (the current sub-pixel of object pixel system is corresponding) needs respectively is p, p11, p12, p13, p14, p21, p22, p23, p24; And the needed waveform of current sub-pixel (for example R sub-pixel shown in Figure 1) that has passed through the processing rear drive object pixel system of f ' vp is p '.Obviously, f ' vp be exactly a p ' and p, p11, p12 ..., the relation between p23, p24.For before satisfying for the definition of f ', namely two visual effects are consistent, f ' vp should arrange like this: for the master reset of target pulse waveform p ' part and the concussion part that resets, should be only to refresh part and concussion with the master of former frame to refresh partly relevant (but being not that the master of former frame refreshes, shakes the inverted waveform that refreshes, reason such as front).Count p ' q3 and shake refresh pulse for the main refresh pulse of target pulse waveform p ' and count p ' q4, if be pq3 with the main refresh pulse number scale of any one source pulse waveform p, concussion refresh pulse number scale is pq4, should have
p′·q3＝INT[A*p·q3+B*(p11·q3+p12·q3+p13·q3+p14·q3)+C*(p21·q3+p22·q3+p23·q3+p24·q3)]；
p′·q4＝INT[A*p·q4+B*(p11·q4+p12·q4+p13·q4+p14·q4)+C*(p21·q4+p22·q4+p23·q4+p24·q4)]；
Wherein, pq3, p11q3, p12q3, p13q3, p14q3, p21q3, p22q3, p23q3, p24q3 are respectively the main refresh pulse number of source pulse waveform p, p11, p12, p13, p14, p21, p22, p23, p24; Pq3, p11q3, p12q3, p13q3, p14q3, p21q3, p22q3, p23q3, p24q3 are respectively the concussion refresh pulse number of source pulse waveform p, p11, p12, p13, p14, p21, p22, p23, p24.
Briefly, can make C=0.Here p ' q3 and p ' q4 must be obviously integers.
Preferably, image rendering f ' also counts p ' q3 to main refresh pulse and the concussion refresh pulse is counted p ' q4 and carried out normalizing operation.Fig. 5 is brightness-GTG coordinate diagram.In display device, the brightness of light is a successive value, but determines that the pixel gray level of pixel intensity is a series of discrete value, and (as shown in the round dot on curve in figure) can be referred to as the standard GTG, such as 16 GTGs, 256 GTGs etc.The above-mentioned image rendering that carries out operates f ' time, the main refresh pulse that obtains is counted p ' q3 and concussion refresh pulse, and to count p ' q4 be only integer (as shown in the trigpoint on curve in figure), counts p ' q3 and shake refresh pulse and count the target pulse waveform p ' driving bistable display of p ' q4 and not necessarily can obtain the brightness identical with the standard GTG with having this main refresh pulse.Therefore, as preferred embodiment a kind of, image rendering f ' also main refresh pulse is counted p ' q3 and the concussion refresh pulse is counted p ' q4 and carried out normalizing operation, thereby obtain that standard master refresh pulse is counted p ' q3 ' and standard concussion refresh pulse is counted p ' q4 ', count p ' q3 ' and standard and shake refresh pulse and count the target pulse waveform p ' driving bistable display of p ' q4 ' and can obtain the brightness identical with the standard GTG with having this standard master refresh pulse.
According to preamble, for the master reset of target pulse waveform p ' part and the concussion part that resets, only refresh partly with the master of former frame and concussion to refresh part relevant.So embodiments of the invention one store the refresh pulse number (comprising that main refresh pulse is counted p ' q3 and the concussion refresh pulse is counted p ' q4 or counts p ' q3 ' through the standard master's refresh pulse after normalizing operation and count p ' q4 ' with standard concussion refresh pulse) of image rendering unit 3 outputs in refresh pulse number register 5 into, are convenient to retrieval and definite occurrence of next frame master reset umber of pulse and concussion reset pulse number.And for present frame, the current refresh pulse number of refresh pulse number register 5 memory image rendering unit 3 outputs is also exported former frame refresh pulse number (comprise former frame master refresh pulse count p " q3 and former frame concussion refresh pulse are counted p " q4 or count p " q3 ' and former frame standard concussion refresh pulse count p " q4 ' through the former frame standard master refresh pulse after normalizing operation).
Refresh/reset to store in truth table register 6 and refresh/reset truth table (as shown in Figure 6).It is former frame refresh pulse number and (A, the B) mapping table with current reset pulse number (C, D) that this storage refreshes/reset truth table.A is that to count p " q3, B are that former frame concussion refresh pulse is counted p " q4, C be that current master reset umber of pulse p ' q1, D are that current concussion reset pulse is counted p ' q2 to former frame master refresh pulse.Certainly, A, B, C, D can be all through standardized numerical value.Refresh/reset truth table register 6 according to the former frame refresh pulse number of image rendering unit 3 outputs, retrieving this refreshes/resets truth table and obtain current reset pulse number and (comprise that current master reset umber of pulse p ' q1 and current concussion reset pulse count p ' q2), and output.
Waveform generator 4 generates with the current reset pulse number that refreshes/reset 6 outputs of truth table register the target pulse waveform p ' that is used for driving bistable display 7 according to the current refresh pulse number of image rendering unit 3 outputs.The target pulse waveform p ' that produces like this, its effect is with that source image information is first remake through image rendering f the visual effect that PWM processing rear drive bistable display obtains is the same.
Preferably, bi-stable display device 10 is Electronic Paper.
Embodiment two
The structured flowchart of the bi-stable display device 20 that Fig. 7 provides for the embodiment of the present invention two.As can be seen from Figure 7, bi-stable display device 20 comprises bistable display 23 and the driving circuit 24 that drives signal (being the target pulse waveform) is provided for this bistable display 23.Driving circuit 24 converts the target pulse waveform to drive bistable display 23 again by the mode of tabling look-up after the source image information of inputting is changed into the source pulse waveform by pulse-length modulation (PWM).
As can be seen from Figure 7, driving circuit 24 comprises: pulse-length modulation (PWM) unit 21, truth table storage and search unit 22.
The source image information that pulse-length modulation (PWM) unit 21 consists of according to the GTG signal by numeral is tabled look-up in the middle of the waveform library and is chosen source pulse waveform and output, and in the pulse waveform of source, the number of times of height pulse determines the GTG of pixel.
Truth table is stored and is searched unit 22 and searches current target pulse waveform according to the source pulse waveform of pulse-length modulation (PWM) unit 21 outputs and the target pulse waveform of former frame in truth table, and should export bistable display 23 to by current target pulse waveform, in order to drive this bistable display 23.
In actual operation, compile and edit in advance a cover condition selective rule, set up a truth table.This truth table is filled out corresponding target pulse waveform p ' value in advance take a series of source pulse waveform p as cond in table, then this truth table is stored in the truth table storage and searches in unit 22.Like this, after a series of source pulse waveform p of input determine, finally need the target pulse waveform p ' of output also just to determine.
Take image rendering fvp shown in Figure 1 as example, illustrate this truth table and how to produce.
By Fig. 1 and explanation thereof as can be known: the GTG value R ' of R sub-pixel can calculate according to following formula: R '=A*r+B* (r
11+ r
12+ r
13+ r
14)+C* (r
21+ r
22+ r
23+ r
24), wherein A, B, C are weight parameter, and A+4B+4C=1 is arranged.G sub-pixel and sub-pixel B are in like manner.If if at the source pixel image under the effect of pulse-length modulation (PWM), the source pulse waveform that driving each pixel P shown in Figure 1, P11, P12, P13, P14, P21, P22, P23, P24 (the current sub-pixel of object pixel system is corresponding) needs respectively is p, p11, p12, p13, p14, p21, p22, p23, p24; And corresponding target pulse waveform is p '.In addition, current goal pulse waveform p ' is not only that p, p11, p12, p13, p14, p21, p22, p23, p24 are relevant with pulse waveform, also with former frame target pulse waveform p " relevant; therefore, this truth table be exactly a p ' and p, p11, p12 ..., p23, p24 and between p " relation.
The bi-stable display device that the present embodiment provides and driving circuit thereof directly adopt the mode of searching truth table to obtain the target pulse waveform, and truth table only need to be stored in the IC chip, is convenient to integrated.
Preferably, bi-stable display device 20 is Electronic Paper.
Embodiment three
The present invention also provides a kind of driving method of bi-stable display device, and the process flow diagram of the method as shown in Figure 8.This driving method comprises the steps:
Step S100: choose the source pulse waveform according to source image information.
Wherein, source image information is made of the GTG signal of numeral, and this source pulse waveform is the acquisition of tabling look-up in the middle of the waveform library according to this source image information.
Step S200: the pulse in this source pulse waveform is counted.
Wherein, this step obtains the refresh pulse number (comprising that main refresh pulse is counted pq3 and the concussion refresh pulse is counted pq4) of each source pulse waveform p.
Step S300: this refresh pulse number is played up operation f ', obtain the refresh pulse number of target pulse waveform.
Wherein, this step is played up operation f ' to refresh pulse number (comprising that main refresh pulse is counted pq3 and the concussion refresh pulse is counted pq4), and (main refresh pulse counts p ' q3 and the concussion refresh pulse is counted p ' q4) for the refresh pulse number of the target pulse waveform p ' of acquisition based target pixel system.
As preferred embodiment a kind of, this plays up operation f ' can be the image rendering technology of " dynamic pixel " (virtual pixel).Suppose that the source pulse waveform corresponding with current goal pulse waveform p ' is: p, p11, p12, p13, p14, p21, p22, p23, p24, the main refresh pulse of target pulse waveform p ' counts p ' q3 and the concussion refresh pulse is counted p ' q4, if be pq3 with the main refresh pulse number scale of any one source pulse waveform p, concussion refresh pulse number scale is pq4, should have
p′·q3＝INT[A*p·q3+B*(p11·q3+p12·q3+p13·q3+p14·q3)+C*(p21·q3+p22·q3+p23·q3+p24·q3)]；
p′·q4＝INT[A*p·q4+B*(p11·q4+p12·q4+p13·q4+p14·q4)+C*(p21·q4+p22·q4+p23·q4+p24·q4)]；
Wherein, A, B, C are weight parameter, and A+4B+4C=1 is arranged; Pq3, p11q3, p12q3, p13q3, p14q3, p21q3, p22q3, p23q3, p24q3 are respectively the main refresh pulse number of source pulse waveform p, p11, p12, p13, p14, p21, p22, p23, p24; Pq3, p11q3, p12q3, p13q3, p14q3, p21q3, p22q3, p23q3, p24q3 are respectively the concussion refresh pulse number of source pulse waveform p, p11, p12, p13, p14, p21, p22, p23, p24.
Briefly, can make C=0.Here p ' q3 and p ' q4 must be obviously integers.
Preferably, step S300 also main refresh pulse is counted p ' q3 and the concussion refresh pulse is counted p ' q4 and carried out normalizing operation, thereby the standard of acquisition master refresh pulse counts p ' q3 ' and standard concussion refresh pulse is counted p ' q4 '.The content of specific standards operation can with reference to embodiment one, not repeat them here.
Step S400: obtain current reset pulse number according to former frame refresh pulse number, generate the target pulse waveform according to current reset pulse number and current refresh pulse number.
Wherein, former frame refresh pulse number comprises that former frame master refresh pulse counts p " q3 and former frame concussion refresh pulse is counted p " q4 or count p " q3 ' and former frame standard concussion refresh pulse count p " q4 ' through the former frame standard master refresh pulse after normalizing operation.Current reset pulse number comprises that current master reset umber of pulse p ' q1 and current concussion reset pulse count p ' q2.The method of obtaining current reset pulse number according to former frame refresh pulse number can with reference to Fig. 6 and explanation thereof, not repeat them here.Can adopt waveform generator according to current reset pulse number and current refresh pulse number generation target pulse waveform.
Step S500: with this target pulse drive waveform bistable display.
Wherein, bistable display is generally Electronic Paper.
Although the present invention with preferred embodiment openly as above, but it is not to limit the present invention, any those skilled in the art can utilize the method for above-mentioned announcement and technology contents to make possible change and modification to technical solution of the present invention without departing from the spirit and scope of the present invention.Therefore, every content that does not break away from technical solution of the present invention to any simple modification, equivalent variations and modification that above embodiment does, all belongs to the protection domain of technical solution of the present invention according to technical spirit of the present invention.
Claims (17)
1. a driving circuit, be used for driving this bistable display, it is characterized in that, described driving circuit comprises:
Pwm unit is tabled look-up in the middle of the waveform library according to source image information and is chosen the source pulse waveform;
Impulse meter is counted the refresh pulse number of output source pulse waveform to the pulse in described source pulse waveform of rushing width modulation unit output;
Operation is played up to the refresh pulse number of described impulse meter output in the image rendering unit, obtains the refresh pulse number of target pulse waveform;
The refresh pulse number register is stored the current refresh pulse number of described image rendering unit output and exports former frame refresh pulse number;
Refresh/reset the truth table register, storage refreshes/resets truth table, and retrieves this according to the former frame refresh pulse number of described image rendering unit output and refresh/reset the current reset pulse number of truth table acquisition;
The waveform maker generates according to current refresh pulse number and the described current reset pulse number that refreshes/reset the output of truth table register of described image rendering unit output the target pulse waveform that is used for described driving bistable display.
2. driving circuit as claimed in claim 1, is characterized in that, the refresh pulse number of described source pulse waveform comprises that main refresh pulse is counted pq3 and the concussion refresh pulse is counted pq4.
3. driving circuit as claimed in claim 2, is characterized in that, the described image rendering technology that is operating as " dynamic pixel " of playing up.
4. driving circuit as claimed in claim 3, it is characterized in that, the waveform that drives current pixel in the object pixel system is p ', the source pulse waveform that in drive source pixel system, each pixel P, P11, P12, P13, P14, P21, P22, P23, the P24 corresponding with described current pixel needs respectively is p, p11, p12, p13, p14, p21, p22, p23, p24, has
p′·q3＝INT[A*p·q3+B*(p11·q3+p12·q3+p13·q3+p14·q3)+C*(p21·q3+p22·q3+p23·q3+p24·q3)]，
p′·q4＝INT[A*p·q4+B*(p11·q4+p12·q4+p13·q4+p14·q4)+C*(p21·q4+p22·q4+p23·q4+p24·q4)]；
Wherein, A, B, C are weight parameter, and A+4B+4C=1 is arranged; Pq3, p11q3, p12q3, p13q3, p14q3, p21q3, p22q3, p23q3, p24q3 are respectively the main refresh pulse number of source pulse waveform p, p11, p12, p13, p14, p21, p22, p23, p24; Pq3, p11q3, p12q3, p13q3, p14q3, p21q3, p22q3, p23q3, p24q3 are respectively the concussion refresh pulse number of source pulse waveform p, p11, p12, p13, p14, p21, p22, p23, p24.
5. driving circuit as claimed in claim 4, is characterized in that, C=0.
6. driving circuit as claimed in claim 4, it is characterized in that, described image rendering unit also main refresh pulse is counted p ' q3 and the concussion refresh pulse is counted p ' q4 and carried out normalizing operation, obtains that standard master refresh pulse is counted p ' q3 ' and standard concussion refresh pulse is counted p ' q4 '.
7. driving circuit as claimed in claim 1, is characterized in that, bistable display is Electronic Paper.
8. a bi-stable display device, comprise bistable display and the described driving circuit of claim 1-7 any one.
9. a driving circuit, be used for driving this bistable display, it is characterized in that, described driving circuit comprises:
Pwm unit is tabled look-up in the middle of the waveform library according to source image information and is chosen the source pulse waveform;
The unit is stored and searched to truth table, search current target pulse waveform according to the source pulse waveform of described pwm unit output and the target pulse waveform of former frame in truth table, and should export described bistable display to by current target pulse waveform, in order to drive described bistable display.
10. a bi-stable display device, comprise bistable display and driving circuit claimed in claim 9.
11. the driving method of a bi-stable display device comprises the steps:
Step S100: choose the source pulse waveform according to source image information
Step S200: the pulse in the pulse waveform of described source is counted;
Step S300: described refresh pulse number is played up operation, obtain the refresh pulse number of target pulse waveform;
Step S400: obtain current reset pulse number according to former frame refresh pulse number, generate the target pulse waveform according to current reset pulse number and current refresh pulse number;
Step S500: with described target pulse drive waveform bistable display.
12. driving method as claimed in claim 11 is characterized in that, the refresh pulse number of described source pulse waveform comprises that main refresh pulse is counted pq3 and the concussion refresh pulse is counted pq4.
13. driving method as claimed in claim 12 is characterized in that, the described image rendering technology that is operating as " dynamic pixel " of playing up.
14. driving method as claimed in claim 13, it is characterized in that, the waveform that drives current pixel in the object pixel system is p ', the source pulse waveform that in drive source pixel system, each pixel P, P11, P12, P13, P14, P21, P22, P23, the P24 corresponding with described current pixel needs respectively is p, p11, p12, p13, p14, p21, p22, p23, p24, has
p′·q3＝INT[A*p·q3+B*(p11·q3+p12·q3+p13·q3+p14·q3)+C*(p21·q3+p22·q3+p23·q3+p24·q3)]，
p′·q4＝INT[A*p·q4+B*(p11·q4+p12·q4+p13·q4+p14·q4)+C*(p21·q4+p22·q4+p23·q4+p24·q4)]；
Wherein, A, B, C are weight parameter, and A+4B+4C=1 is arranged; Pq3, p11q3, p12q3, p13q3, p14q3, p21q3, p22q3, p23q3, p24q3 are respectively the main refresh pulse number of source pulse waveform p, p11, p12, p13, p14, p21, p22, p23, p24; Pq3, p11q3, p12q3, p13q3, p14q3, p21q3, p22q3, p23q3, p24q3 are respectively the concussion refresh pulse number of source pulse waveform p, p11, p12, p13, p14, p21, p22, p23, p24.
15. driving method as claimed in claim 14 is characterized in that, C=0.
16. driving method as claimed in claim 14, it is characterized in that, described step S300 also main refresh pulse is counted p ' q3 and the concussion refresh pulse is counted p ' q4 and carried out normalizing operation, obtains that standard master refresh pulse is counted p ' q3 ' and standard concussion refresh pulse is counted p ' q4 '.
17. driving method as claimed in claim 11 is characterized in that, bistable display is Electronic Paper.
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