CN1244893C - Method for driving plasma display with variable frequency of displaying frames - Google Patents
Method for driving plasma display with variable frequency of displaying frames Download PDFInfo
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- CN1244893C CN1244893C CN 02120678 CN02120678A CN1244893C CN 1244893 C CN1244893 C CN 1244893C CN 02120678 CN02120678 CN 02120678 CN 02120678 A CN02120678 A CN 02120678A CN 1244893 C CN1244893 C CN 1244893C
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Abstract
The present invention relates to a driving method for a plasma display with variable picture display frequency. The duration time in a holding period is extended to achieve the purpose of high brightness. The driving method of the present invention uses an image load value to regulate the display frequency of the plasma display, and the time for displaying each image picture on the plasma display is regulated according to the change of the display frequency of the plasma display. The driving method of the present invention also uses the image load value to regulate the total number of holding pulses in the plasma display. The present invention also provides a driving device of a plasma display with the variable picture display frequency to be matched with the driving method of the present invention.
Description
Technical field
The present invention is about a kind of plasma display (plasma display panel of variable picture frequency, hereinafter to be referred as PDP) driving method and device, particularly a kind of duration that increases in plasma display during keeping reaches the driving method and the device of high brightness purpose.
Background technology
According to having plasma display dirving method now: a complete picture shows that (frame) is made up of the display action of a plurality of sprites (sub-field), GTG plasma display with 256 looks is an example, each image frame display action by 8 according to one both the explicit action of sprite of definite sequence formed, complete picture shown in the 1st figure is arranged by 8 sprites according to both definite sequences of SF1～SF8 to form, each sprite by three operational motions during institute form, be respectively (resetperiod) R1～R8 during the replacement, during writing (address period) A1～A8 and keep during (sustainperiod) S1～S8.During the replacement be when being used for removing last sprite and showing remaining electric charge, and the wall electric charge (wall charge) that in each display unit, stays some.Then be to see through address discharge (address discharge) (promptly being the on state) accumulation wall electric charge in the display unit that needs show during writing.Then be during keeping in the unit that sees through address discharge accumulation wall electric charge, show to keep discharge (sustain discharge).Wherein, during the replacement R1～R8 and keep during S1～S8 be whole unit of handling simultaneously on the plasma display, A1～A8 carries out write activity for each unit on each scan-line electrode in regular turn during writing.In addition, display brightness with keep during the length of S1～S8 be directly proportional.In the example of this figure, the length of S1～S8 can be made as 1: 2: 4 during keeping among each sprite SF1～SF8: 8: 16: 32: 64: 128 ratio, this is the configuration of keeping discharge cycle quantity, realizes 256 GTGs whereby.We must increase the duration during keeping, and make plasma display produce high brightness.
Sum is Σ Tsustain during the keeping of each sprite in the image frame if each is established, Tr consuming time is moved in replacement in each sprite, the write activity of each bar sweep trace Ts consuming time, if the sweep trace of this plasma display has the Ns bar, Nsf sprite of each image frame tool of this plasma display, this plasma display show that the time of each image frame is T (i.e. the display frequency of 1/ plasma display):
T＝(Tr+Ts*Ns)*Nsf+ΣTsustain
At present reach high brightness and adopted following two kinds of driving methods in order to increase ∑ Tsustain in the plasma display:
1. the number that changes each image frame tool sprite promptly changes Nsf, adjust with image load (imageloading) and always to keep the effect that umber of pulse (total sustainpulses) reaches high brightness in the number of sprite and the plasma display, but use the method when high mean flow rate, may influence visual effect because of the number that uses less sprite.
2. the quantity that changes sweep trace promptly changes Ns and always keeps the effect that umber of pulse (total sustain pulses) reaches high brightness to increase in the plasma display, but uses the method image quality meeting when low grey menu shows very poor.
Summary of the invention
In view of this, the invention provides a kind of plasma display dirving method of variable frequency of displaying frames, it increases ∑ Tsustain and reaches the high brightness purpose, driving method of the present invention is adjusted the display frequency of this plasma display with an image load value, be adjusted at the time that plasma display shows each image frame by the display frequency that changes plasma display, driving method of the present invention is also adjusted with described image load value and is always kept umber of pulse (total sustain pulses) in the plasma display.Driving method of the present invention can be avoided the shortcoming of described two methods, and reaches the purpose that increases ∑ Tsustain and obtain high brightness equally.
For reaching described purpose, the present invention proposes the plasma display dirving method of first kind of variable frequency of displaying frames, it is applicable in the plasma display, described plasma display has a display frequency, one always keeps umber of pulse and a plurality of sprite and described each sprite disposes one and keeps discharge cycle quantity, described driving method comprises the following steps: at first, import picture in described plasma display, again by described input picture, calculate an image load value, change described display frequency according to described image load value and become a new display frequency, and change the described umber of pulse of always keeping according to described image load value and become a new umber of pulse of always keeping, then, according to described display frequency, what reconfigure described each sprite keeps discharge cycle quantity, at last, according to described new display frequency, new always keep umber of pulse and sprite shows that in described plasma display one exports picture.
Cooperate described first kind of driving method, the present invention proposes a kind of drive unit of plasma display of variable frequency of displaying frames, it is connected to a tool one and always keeps on the plasma display of umber of pulse and a plurality of sprites, and described each sprite disposes one and keeps discharge cycle quantity, described drive unit comprises: an input media, and it accepts an input picture of tool one incoming frequency; One measuring equipment, it is connected in described input media, is used to measure an image load value of described input picture, exports described image load value; One changes device, it connects described input media and described measuring equipment, be used to accept the described input picture of the described incoming frequency of tool, described input picture conversion is become an image frame of tool one output frequency, export described image frame, wherein said output frequency is the function of described image load value; And one first control display device, it connects described modifier and described measuring equipment, be used to accept described image frame, judge the output frequency in the described image frame, described output frequency be lower than 50 hertz then reconfigure described each sprite keep discharge cycle quantity, with bigger on average being disposed in the described sprite of described discharge cycle quantitative value, and change and describedly always keep umber of pulse and described image frame is shown on the described plasma display, wherein said image frame always keep the function that umber of pulse is described image load value.
The present invention also proposes the plasma display dirving method of second kind of variable frequency of displaying frames, and it is adjusted the display frequency of plasma display and and reaches the purpose that increases Σ Tsustain and obtain high brightness according to the number that this display frequency is adjusted sprite in plasma display.The plasma display dirving method of described variable frequency of displaying frames is applicable in the plasma display, described plasma display has a display frequency, one always keeps umber of pulse and a plurality of sprite, described driving method comprises the following steps, at first, import picture in described plasma display, again by described input picture, calculate an image load value, changing described display frequency according to described image load value becomes a new display frequency and changes the described umber of pulse of always keeping according to described image load value and become a new umber of pulse of always keeping, then, according to described display frequency, change the number of described sprite, at last, according to described new display frequency, new always keep umber of pulse and sprite shows that in described plasma display one exports picture.
Cooperate described second kind of driving method, the present invention proposes the drive unit of the plasma display of another kind of variable frequency of displaying frames, it is connected to a tool one and always keeps on the plasma display of umber of pulse and a plurality of sprites, described drive unit comprises: an input media, and it accepts an input picture of tool one incoming frequency; One measuring equipment, it is connected in described input media, is used to measure an image load value of described input picture, exports described image load value; One changes device, it connects described input media and described measuring equipment, be used to accept the described input picture of the described incoming frequency of tool, described input picture conversion is become an image frame of tool one output frequency, export described image frame, wherein said output frequency is the function of described image load value; And one second control display device, it connects described modifier and described measuring equipment, be used to accept described image frame, judge the output frequency in the described image frame, described output frequency is lower than the number that a low frequency then reduces described sprite, and change and describedly always keep umber of pulse and described image frame is shown on the described plasma display, wherein said image frame always keep the function that umber of pulse is described image load value.
Description of drawings
For described and other purpose of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. are described in detail as follows:
Fig. 1 is the picture display action synoptic diagram of the traditional plasma display of expression.
Fig. 2 is the process flow diagram of plasma display dirving method of the variable frequency of displaying frames of expression first embodiment of the invention.
Fig. 3 is the form that example is done that the driving method of first embodiment of the invention is used in expression.
Fig. 4 always keeps the graph of a relation that umber of pulse and display frequency are done the image load value respectively in the driving method of expression first embodiment of the invention.
Fig. 5 is the drive unit synoptic diagram of plasma display of the variable frequency of displaying frames of expression first embodiment of the invention.
Fig. 6 is the process flow diagram of plasma display dirving method of the variable frequency of displaying frames of expression second embodiment of the invention.
Fig. 7 always keeps the graph of a relation that umber of pulse and display frequency are done the image load value respectively in the driving method of expression second embodiment of the invention.
Fig. 8 is the drive unit synoptic diagram of plasma display of the variable frequency of displaying frames of expression second embodiment of the invention.
SF1～SF8～sprite; During R1～R8～replacement; A1～A8～during writing; S1～S8～during keeping; 42,72～the first longitudinal axis; 44,74～the second longitudinal axis; 41,43,71,73～curve; 100, the drive unit of the plasma display of 200～variable frequency of displaying frames; 102,202～input media; 104,204～measuring equipment; 106,206～modifier; 108～the first image control devices; 110,200～plasma display; 208～the second image control devices; Lo～image load value; F1, f2～frequency.
Embodiment
With reference to figure 2, Fig. 2 is the process flow diagram of plasma display dirving method of the variable frequency of displaying frames of first embodiment of the invention.It is applicable to the plasma display dirving method of the variable frequency of displaying frames that the present invention proposes in the plasma display, described plasma display has a display frequency, one always keeps umber of pulse and a plurality of sprite and described each sprite disposes one and keeps discharge cycle quantity, described driving method comprises the following steps: at first, import picture (step S100) in described plasma display, again by described input picture, calculate an image load value (step S102), change described display frequency according to described image load value and become a new display frequency (step S104), and change the described umber of pulse of always keeping according to described image load value and become a new umber of pulse (step S106) of always keeping, then, according to described display frequency, what reconfigure described each sprite keeps discharge cycle quantity (step S108), at last, according to described new display frequency, new always keep umber of pulse and sprite shows that in described plasma display one exports picture (step S110).
Wherein changing described display frequency and become among the step S104 of new display frequency according to described image load value, described image load value is bigger, and described new display frequency is healed the scope of big and described new display frequency between 43 hertz to 70 hertz.Becoming among the new step S106 that always keeps umber of pulse according to the described umber of pulse of always keeping of described image load value change, described image load value is bigger, and the described new umber of pulse of always keeping heals that new always to keep the umber of pulse mapping be a monotonous curve to little and described image load value to described.In the step S108 that keeps discharge cycle quantity that reconfigures described each sprite according to described display frequency, comprise following substep: judge whether described new display frequency is lower than 50 hertz, if described new display frequency be not less than 50 hertz then need not reconfigure described each sprite keep discharge cycle quantity, if described new display frequency be lower than 50 hertz then reconfigure described each sprite keep discharge cycle quantity, with bigger on average being disposed in the described sprite of described discharge cycle quantitative value.
Fig. 3 is the form that example is done that the driving method of first embodiment of the invention is used in expression.Suppose described plasma display has among each sprite SF1～SF10 of 10 sprite SF1～SF10 to suppose to be 1,2,4,8,16,32,48,48,48,48 in regular turn for the configuration of keeping discharge cycle quantity, if this traditional framework, 10 sprites can have 615 to keep pulse when showing, each time of keeping pulse is 6 μ s, and always keeping umber of pulse is 615.Suppose that existing display frequency is 60 hertz, the brightness of peak value is 530nits, and on average each brightness of keeping the peak value of pulse is 530/615=0.8618.Import the input picture of 60 hertz of tool display frequencies, then calculate the image load value of described input picture, the brightness that described input picture is had light its image load value of counting the more of healing is bigger, the image load value of supposing this input picture is little, be that this input picture does not almost have bright spot, then change described display frequency～60 and hertz become new display frequency～43 hertz according to this image load value, originally show that the time of described input picture is 16.6667ms, become 23.2558ms now, then described input picture has had more (23.2558-16.6667) ms/6 μ s=6.5891ms/6 μ s and has kept umber of pulse, approximately have more 1098 and kept pulse, so the new umber of pulse of always keeping becomes 1713 (1098+615), described input picture has increased the brightness (6.5891ms/6 μ s*0.8618) of 946.4087nits, so the new peak brightness of described input picture is 1476.4087nits (946.4087+530).Preceding need the at the described input picture of output judges whether described new display frequency is lower than 50 hertz earlier, described new display frequency is 43 hertz and is lower than 50 hertz, so what reconfigure each sprite keeps discharge cycle quantity, keep bigger on average being disposed in the described sprite of discharge cycle quantitative value with described, promptly being reconfigured for 48 for what keep discharge cycle quantity among each sprite SF1～SF10,1,2,48,4,8,48,16,32,48, so can avoid the slight flicker (flicker) that (in the present invention for being lower than 50 hertz display frequency) produces when hanging down display frequency.At last, with described input picture, according to described new display frequency, new always keep umber of pulse and sprite shows that in described plasma display one exports picture.Because the average peak brightness of output picture is 1058.093nits (1476.4087*43/60), gone up manyly than the 530nits that originally imports picture more, so the present invention can promote the brightness of importing minority bright spot in the picture originally really greatly in the output picture
Fig. 4 always keeps the graph of a relation that umber of pulse and display frequency are done the image load value respectively in the driving method of expression first embodiment of the invention.As shown in the figure, transverse axis is image load value from 0% to 100%, the first longitudinal axis 42 for always keeping umber of pulse, and second longitudinal axis 44 for display frequency unit is hertz.Curve 41 is for always to keep the figure that umber of pulse is done the image load value, and as shown in the figure, curve 41 is a decline history, and the image load value is bigger, and it is littler always to keep umber of pulse.The figure that curve 43 is done the image load value for the display frequency number, as shown in the figure, curve 43 is one to increase progressively curve, and in the display frequency scope (between 43 hertz to 70 hertz), the image load value is bigger, and display frequency is bigger.
Fig. 5 is the drive unit synoptic diagram of plasma display of the variable frequency of displaying frames of expression first embodiment of the invention.For cooperating the driving method among Fig. 2, the present invention proposes a kind of drive unit 100 of plasma display of variable frequency of displaying frames, it is connected to a tool one and always keeps on the plasma display 110 of umber of pulse and a plurality of sprites, and described each sprite disposes one and keeps discharge cycle quantity, described drive unit 100 comprises, one input media 102, it accepts the input picture of tool one incoming frequency f1, one measuring equipment 104, it is connected in described input media 102, be used to measure an image load value lo of described input picture, export described image load value lo, one changes device 106, it connects described input media 102 and described measuring equipment 104, be used to accept the described input picture of the described incoming frequency f1 of tool, described input picture conversion is become the image frame of tool one output frequency f2, export described image frame, wherein said output frequency f2 is the function of described image load value lo, and one first control display device 108, it connects described modifier 104 and described measuring equipment 106, be used to accept described image frame, judge the output frequency f2 in the described image frame, wherein said output frequency f2 be lower than 50 hertz then reconfigure described each sprite keep discharge cycle quantity, with bigger on average being disposed in the described sprite of described discharge cycle quantitative value, and change and describedly always keep umber of pulse and described image frame is shown on the described plasma display 110, wherein said image frame always keep the function that umber of pulse is described image load value lo.
With reference to figure 6, Fig. 6 is the process flow diagram of plasma display dirving method of the variable frequency of displaying frames of second embodiment of the invention.The plasma display dirving method of described variable frequency of displaying frames is applicable in the plasma display, described plasma display has a display frequency, one always keeps umber of pulse and a plurality of sprite, described driving method comprises the following steps, at first, import picture (step S200) in described plasma display, again by described input picture, calculate an image load value (step S202), changing described display frequency according to described image load value becomes a new display frequency (step S204) and changes the described umber of pulse of always keeping according to described image load value and become a new umber of pulse (step S206) of always keeping, then, according to described display frequency, change the number (step S208) of described sprite, at last, according to described new display frequency, new always keep umber of pulse and sprite shows that in described plasma display one exports picture (step S210).
Wherein become among the step S204 of a new display frequency changing described display frequency according to described image load value, described image load value is bigger, and described new display frequency is healed the scope of big and described new display frequency between 43 hertz to 70 hertz.Changing the described umber of pulse of always keeping according to described image load value becomes among the new step S206 who always keeps umber of pulse, described image load value is bigger, and the described new umber of pulse of always keeping heals that new always to keep the umber of pulse mapping be a monotonous curve to little and described image load value to described.
In the step S208 of the number that changes described sprite according to described display frequency, comprise following substep: judge whether described new display frequency is lower than a low frequency, and described new display frequency is lower than described low frequency, then reduces the number of described sprite.In the second embodiment of the present invention, described low frequency is 55 hertz, when described new display frequency is lower than 55 hertz, reduces the number of described sprite, can increase the duration during keeping, and has promptly reached purpose of the present invention.
Fig. 7 always keeps the graph of a relation that umber of pulse and display frequency are done the image load value respectively in the driving method of expression second embodiment of the invention.As shown in Figure 7, transverse axis is image load value from 0% to 100%, the first longitudinal axis 72 for always keeping umber of pulse, and second longitudinal axis 74 for display frequency unit is hertz.Curve 71 is for always to keep the figure that umber of pulse is done the image load value, and as shown in the figure, curve 71 is a decline history, and the image load value is bigger, and it is littler always to keep umber of pulse.The figure that curve 73 is done the image load value for the display frequency number, as shown in the figure, curve 73 is one to increase progressively curve, and in the display frequency scope (between 43 hertz to 70 hertz), the image load value is bigger, and display frequency is bigger.
Fig. 8 is the drive unit synoptic diagram of plasma display of the variable frequency of displaying frames of expression second embodiment of the invention.For cooperating the driving method among the 6th figure, the present invention proposes a kind of drive unit 200 of plasma display of variable frequency of displaying frames, it is connected to a tool one and always keeps on the plasma display 210 of umber of pulse and a plurality of sprites, and described each sprite disposes one and keeps discharge cycle quantity, described drive unit 200 comprises, one input media 202, it accepts the input picture of tool one incoming frequency f1, one measuring equipment 204, it is connected in described input media 202, be used to measure an image load value lo of described input picture, export described image load value lo, one changes device 206, it connects described input media 202 and described measuring equipment 204, be used to accept the described input picture of the described incoming frequency f1 of tool, described input picture conversion is become the image frame of tool one output frequency f2, export described image frame, wherein said output frequency f2 is the function of described image load value lo, and one second control display device 208, it connects described modifier 204 and described measuring equipment 206, be used to accept described image frame, judge the output frequency f2 in the described image frame, described output frequency f2 is lower than the number that a low frequency then reduces described sprite, and change and describedly always keep umber of pulse and described image frame is shown on the described plasma display 110, wherein said image frame always keep the function that umber of pulse is described image load value lo.In the second embodiment of the present invention, described low frequency is 55 hertz.
In sum, the present invention provides a kind of duration that increases in plasma display during keeping to reach the method for high brightness purpose really, driving method of the present invention is for adjusting the display frequency of this plasma display with the image load value, be adjusted at the time that plasma display shows each image frame by the display frequency that changes plasma display, driving method of the present invention is also adjusted with the image load value and is always kept umber of pulse in the plasma display.Cooperate driving method of the present invention, also proposed a kind of drive unit of plasma display of variable frequency of displaying frames in the present invention.
Though the present invention discloses as above with preferred embodiment; but it is not in order to qualification the present invention, any insider, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the accompanying Claim book person of defining.
Claims (12)
1. the plasma display dirving method of a variable frequency of displaying frames, it is applicable in the plasma display, described plasma display has a display frequency, always to be kept umber of pulse and a plurality of sprite and described each sprite and disposes one and keep discharge cycle quantity, comprising the following step:
Import picture in described plasma display;
By described input picture, calculate an image load value;
Change described display frequency according to described image load value and become a new display frequency;
Change the described umber of pulse of always keeping according to described image load value and become a new umber of pulse of always keeping;
According to described new display frequency, what reconfigure described each sprite keeps discharge cycle quantity; And
According to described new display frequency, new always keep umber of pulse and sprite shows that in described plasma display one exports picture.
2. driving method according to claim 1, wherein become in the step of a new display frequency changing described display frequency according to described image load value, described image load value is bigger, and described new display frequency is healed the scope of big and described new display frequency between 43 hertz to 70 hertz.
3. driving method according to claim 1 and 2 wherein comprises following substep according to the step of keeping discharge cycle quantity that described new display frequency reconfigures described each sprite:
Judge whether described new display frequency is lower than 50 hertz; And
Described new display frequency be not less than 50 hertz then need not reconfigure described each sprite keep discharge cycle quantity, described new display frequency be lower than 50 hertz then reconfigure described each sprite keep discharge cycle quantity, keep bigger on average being disposed in the described sprite of discharge cycle quantitative value with described.
4. driving method according to claim 1, wherein become in the new step of always keeping umber of pulse changing the described umber of pulse of always keeping according to described image load value, described image load value is bigger, and the described new umber of pulse of always keeping heals that new always to keep the umber of pulse mapping be a monotonous curve to little and described image load value to described.
5. the drive unit of the plasma display of a variable frequency of displaying frames, it is connected to a tool one and always keeps on the plasma display of umber of pulse and a plurality of sprites, and described each sprite disposes one and keeps discharge cycle quantity, and described drive unit comprises:
One input media, its acceptance have an input picture of an incoming frequency;
One measuring equipment, it is connected in described input media, is used to measure an image load value of described input picture, exports described image load value;
One changes device, it connects described input media and described measuring equipment, be used to accept to have the described input picture of described incoming frequency, described input picture conversion is become a image frame with an output frequency, export described image frame, wherein said output frequency is the function of described image load value; And
One first control display device, it connects described modifier and described measuring equipment, be used to accept described image frame, judge the output frequency in the described image frame, described output frequency be lower than 50 hertz then reconfigure described each sprite keep discharge cycle quantity, keep bigger on average being disposed in the described sprite of discharge cycle quantitative value with described, and change and describedly always keep umber of pulse and described image frame is shown on the described plasma display, wherein said image frame always keep the function that umber of pulse is described image load value.
6. the plasma display dirving method of a variable frequency of displaying frames, it is applicable in the plasma display that described plasma display has a display frequency, and always keeps umber of pulse and a plurality of sprite, it comprises the following steps:
Import picture in described plasma display;
By described input picture, calculate an image load value;
According to described image load value, change described display frequency and become a new display frequency;
According to described image load value, change the described umber of pulse of always keeping and become a new umber of pulse of always keeping;
According to described new display frequency, change the number of described sprite; And
According to described new display frequency, new always keep umber of pulse and sprite shows that in described plasma display one exports picture.
7. driving method according to claim 6, wherein become in the step of a new display frequency changing described display frequency according to described image load value, described image load value is bigger, and described new display frequency is healed the scope of big and described new display frequency between 43 hertz to 70 hertz.
8. driving method according to claim 6 wherein comprises following substep according to the step that described new display frequency changes the number of described sprite:
Judge whether described new display frequency is lower than a low frequency; And
Described new display frequency is lower than described low frequency, then reduces the number of described sprite.
9. driving method according to claim 8, described low frequency are 55 hertz.
10. driving method according to claim 6, wherein become in the new step of always keeping umber of pulse changing the described umber of pulse of always keeping according to described image load value, described image load value is bigger, and the described new umber of pulse of always keeping heals that new always to keep the umber of pulse mapping be a monotonous curve to little and described image load value to described.
11. the drive unit of the plasma display of a variable frequency of displaying frames, it is connected to a tool one and always keeps on the plasma display of umber of pulse and a plurality of sprites, and described drive unit comprises:
One input media, it accepts an input picture of tool one incoming frequency;
One measuring equipment, it is connected in described input media, is used to measure an image load value of described input picture, exports described image load value;
One changes device, it connects described input media and described measuring equipment, be used to accept to have the described input picture of described incoming frequency, described input picture conversion is become a image frame with an output frequency, export described image frame, wherein said output frequency is the function of described image load value; And
One second control display device, it connects described modifier and described measuring equipment, be used to accept described image frame, judge the output frequency in the described image frame, described output frequency is lower than the number that a low frequency then reduces described sprite, and change and describedly always keep umber of pulse and described image frame is shown on the described plasma display, wherein said image frame always keep the function that umber of pulse is described image load value.
12. drive unit according to claim 11, the low frequency in the wherein said second control display device is 55 hertz.
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