CN1287344C - Method and device for driving plasma display panel - Google Patents
Method and device for driving plasma display panel Download PDFInfo
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- CN1287344C CN1287344C CNB2003101007368A CN200310100736A CN1287344C CN 1287344 C CN1287344 C CN 1287344C CN B2003101007368 A CNB2003101007368 A CN B2003101007368A CN 200310100736 A CN200310100736 A CN 200310100736A CN 1287344 C CN1287344 C CN 1287344C
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
- G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
- G09G3/294—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for lighting or sustain discharge
- G09G3/2944—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for lighting or sustain discharge by varying the frequency of sustain pulses or the number of sustain pulses proportionally in each subfield of the whole frame
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
- G09G3/296—Driving circuits for producing the waveforms applied to the driving electrodes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Plasma & Fusion (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Gas Discharge Display Tubes (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
A method and apparatus for driving a plasma display panel that is adaptive for improving a sustain driving margin. In the method and apparatus, the number of sustaining pulses is set in response to an average picture level. A period of the sustaining pulse is set in proportion to said average picture level.
Description
Technical field
The present invention relates to plasma display panel, particularly be used to drive the method and apparatus of plasma display panel, this plasma display board is suitable for improvement and keeps driving surplus (sustaindriving margin).
Background technology
Usually, when exciting phosphate material to produce vacuum ultraviolet rays by gas discharge, the display device of plasma display panel (PDP) visible light that to be a kind of use send from phosphate material.This PDP has such advantage, and promptly it has thin thickness and lighter weight compared with existing cathode-ray tube (CRT), and can realize high resolving power and screen on a large scale.This PDP comprises a plurality of discharge cells of arranging with matrix form, and each discharge cell constitutes the pixel of a picture element or this screen.
Show three traditional-electrode, the skeleton view of the discharge cell structure of AC surface-discharge PDP during Fig. 1.
Referring to Fig. 1, tradition three-electrode, the discharge cell of AC surface-discharge PDP comprises: be arranged on the first electrode 12Y and the second electrode 12Z on the substrate 10, and be arranged on the address electrode 20X on the subtegulum 18.
Be provided with the first parallel electrode 12Y and the second electrode 12Z on the substrate 10, upper dielectric layer 14 and diaphragm 16 are set.The wall electric charge that produces based on plasma discharge is accumulated in the upper dielectric layer 14.This diaphragm 16 prevents the damage of the upper dielectric layer 14 that caused by sputter during plasma discharge, and improves the emission efficiency of second electrode.This diaphragm 16 is made by magnesium oxide (MgO) usually.
Lower dielectric layer 22 and barrier ribs 24 are formed on the subtegulum 18 that address electrode 20X is set.The surface of this lower dielectric layer 22 and barrier ribs 24 scribble layer of phosphor material 26.And address electrode 20X forms with the direction of intersecting with the first electrode 12Y and the second electrode 12Z.
This barrier ribs 24 forms with the direction that is parallel to address electrode 20X, is leaked to adjacent discharge cell by the ultraviolet ray and the visible light of discharge generation preventing.During plasma discharge, ultraviolet ray excited this layer of phosphor material 26 of generation is to produce any red, green and blue visible light ray.The inert gas that will be used for gas discharge be injected into be limited to upper and lower substrate 10 and 18 and barrier ribs 24 between discharge space.
This PDP drives a frame picture, it be divided into various have different discharge frequencies the son in, with the expression picture gray level.Each son is divided into the reset cycle that is used for causing equably discharge once more, is used for selecting the addressing period of discharge cell, and the keeping the cycle of gray level that is used to realize to depend on discharge frequency.For example, as shown in Figure 2, when attempting to show the picture of 256 gray levels, the frame period (that is, 16.67 milliseconds) that equals 1/60 second is divided into 8 son SF1 to SF8.And 8 son SF1 are divided into addressing period to each son field of SF8 and keep the cycle.Here, the reset cycle of each son field and addressing period equal each son field, and this keeps the cycle with 2 in each sub
nThe ratio of (wherein n=0,1,2,3,4,5,6 and 7) increases, thus according to this picture of this gray level display.
Referring to Fig. 3, the conventional ADS driving device that is used for PDP comprises: be connected the first reverse gamma corrector 32A, gain controller 34, mistake fan diffuser 36, a son map unit 38 and data adjuster 40 between incoming line 1 and the panel 46, and be connected frame memory 30, the second reverse gamma corrector 32B between incoming line 1 and the panel 46, average picture grade (APL) unit 42 and waveform generator 44.
This first and second reverse gamma corrector 32A and 32B carry out the reverse gamma of gamma correcting video signal and proofread and correct, thus according to the grey scale linear transformed luminance value of vision signal.30 storages of this frame memory are used for R, G and the B data of a frame, and the data that this storage is provided are to the second reverse gamma corrector 32B.
This APL unit 42 receives the video data of being proofreaied and correct by the second reverse gamma corrector 32B and is used to control the quantity of keeping pulse to produce N rank signals (wherein N is an integer).This gain controller 34 amplifies the video data of being proofreaied and correct by the first reverse gamma corrector 32A by actual gain.
This mistake fan diffuser 36 is diffused into adjacent cells to produce the fine setting of brightness value with the wrong composition of unit.This child field map unit 38 heavily distributes the correcting video data from mistake fan diffuser 36 to be used for each son field.
These data adjuster 40 conversions so are applicable to the resolution format that produces panel 46, and it are offered the address drive integrated circult (IC) of panel 46 from the video data of these child field map unit 38 inputs.
This waveform generator 44 uses the N rank signal by 42 inputs of APL unit to produce timing controling signal, and the timing controling signal that produces is offered the addressing drive IC of panel 46, surface sweeping drive IC and keep drive IC.
In traditional PDP drive unit, this APL unit 42 keeps PDP power consumptions constant, and when the brightness step-down of entire image, outstanding zone of becoming clear relatively.As a result, as shown in Figure 4, this APL is set to and keeps number of pulses be inversely proportional to.In other words, when APL uprises, apply a spot of pulse of keeping, and when the APL step-down, then apply a large amount of pulses of keeping.If this APL is arranged to and keeps the inverse ratio of number of pulses, at this moment the energy consumption of panel remains unchanged substantially, and when the brightness step-down of entire image outstanding bright relatively zone.
Yet, when APL is set to and keeps number of pulses and be inversely proportional to, on high APL, use a spot of pulse of keeping, cause a kind of problem that can not make full use of the cycle of keeping thus.In other words, because applying sustain pulse in the part in the cycle of keeping only on high APL is kept the driving surplus and is worsened.Therefore, in traditional PDP, compare with other situations, the emission efficiency on high APL is low.
Clearer and more definite is that owing to use a spot of pulse of keeping on high APL, this is kept pulse and only provides on a part of being scheduled to the cycle of keeping.Therefore, extended during at high APL in its time interval in the cycle of keeping that can not produce any discharge (below be called " idle interval ").If enlarge this idle interval, in other words,, then keep driving surplus and worsened if will keep the cycle and next keep provide time of keeping pulse to be provided with between the cycle very long current.For example, if enlarge this idle interval, the collection because it is met again, the electron charge particulate of before having kept discharge generation is wasted, and causes the unsettled discharge of keeping thus.
Summary of the invention
Therefore, an object of the present invention is to provide the method and apparatus that is used to drive plasma display panel, make this plasma display board be suitable for improving and keep the driving surplus.
In order to realize these or other purpose of the present invention, the method for driving plasma display panel according to an aspect of the present invention, it comprises the following steps: to be provided with the number of pulses of keeping of the average picture grade of response; And be provided with and keep the recurrence interval, wherein only be arranged on the high width of keeping pulse that changes in the subregion at least of described average picture grade.
According to a further aspect in the invention, a kind of method that drives plasma display panel may further comprise the steps: the quantity of keeping pulse that the average picture grade of response is set; The cycle of pulse is kept in setting, wherein: only be arranged on the low width of keeping pulse that changes in the subregion at least of described average picture grade.
The step that the recurrence interval is kept in described setting comprise setting basically with the proportional high width of keeping pulse of average picture grade.
The step that the recurrence interval is kept in described setting comprise setting basically with the proportional low width of keeping pulse of average picture grade.
The step that the quantity of pulse is kept in described setting comprises setting and the average inversely proportional quantity of keeping pulse of picture grade.
Here, the maximum cycle of keeping pulse than wide 0.5 μ s of the minimum period of keeping pulse to 10 μ s.
This method further comprises step: on greater than desired average picture grade the least restrictive frequency is set, so that the described cycle of keeping pulse is limited to less than certain width.
Here, described least restrictive frequency is set so that compare with the minimum period of keeping pulse, this maximum cycle of keeping pulse enlarges 0.5 μ s to 10 μ s.
This method further is included in less than the step that the highest qualification frequency is set on the desired average picture grade, surpasses certain width so that the described cycle of keeping pulse is limited to.
Because described average picture grade enters into seniorly from rudimentary, increases the described cycle of keeping pulse in the mode of stepping.
According to other aspects of the invention, the driving arrangement that is used for plasma display panel comprises: be used to be provided with the stage arrangements such as average picture corresponding to the average picture grade of video data; With the cycle setting device, be used to be provided with the cycle of keeping pulse, wherein, described cycle setting device only is arranged on the high width of keeping pulse that changes in the subregion at least of described average picture grade.
According to a further aspect in the invention, provide a kind of driving arrangement of plasma display panel, comprising: stage arrangements such as average picture are used to be provided with the average picture grade corresponding to video data; With the cycle setting device, be used to be provided with the cycle of keeping pulse, wherein, described cycle setting device only is arranged on the low width of keeping pulse that changes in the subregion at least of described average picture grade.
In this driving arrangement, described cycle setting device setting and the proportional high width of keeping pulse of described average picture grade.
Described cycle setting device setting and the proportional low width of keeping pulse of described average picture grade.
This driving arrangement comprises that further being used to be provided with at least one can enlarge this maximum limit definite value of keeping the recurrence interval and can dwindle the limit value setting device that this keeps the irreducible minimum definite value of recurrence interval.
Here, described cycle setting device receives described maximum limit definite value and described irreducible minimum definite value to control the described cycle of keeping pulse.
Description of drawings
According to the detailed description of the embodiment of the invention of doing below in conjunction with accompanying drawing, these and other purposes of the present invention will become clearer, wherein:
Fig. 1 shows tradition three-electrode, the skeleton view of the discharge cell structure of AC surface discharging plasma displaying panel;
Fig. 2 has described tradition three-electrode, a frame of AC surface discharging plasma displaying panel.
Fig. 3 has shown the structured flowchart of traditional plasma display panel driver;
Fig. 4 is the expression set curve map of keeping number of pulses relevant with APL;
Fig. 5 A and Fig. 5 B are the frequency curve chart of keeping pulse of expression according to the APL of first embodiment of the invention;
Fig. 6 A and Fig. 6 B have shown owing to the cycle of keeping pulse broadens, with the proportional extended curve map of high width of keeping pulse of APL;
Fig. 7 A and Fig. 7 B have shown owing to the cycle of keeping pulse broadens, with the proportional extended curve map of low width of keeping pulse of APL;
Fig. 8 A and Fig. 8 B are the frequency curve chart of keeping pulse of expression according to the APL of second embodiment of the invention;
Fig. 9 A and Fig. 9 B are the cyclic curve figure that keep pulse of expression according to the APL of third embodiment of the invention;
Figure 10 A and Figure 10 B are the frequency curve chart of keeping pulse of expression according to the APL of fourth embodiment of the invention;
Figure 11 is the frequency curve chart of keeping pulse of expression according to the APL of fifth embodiment of the invention;
Figure 12 has shown the structured flowchart of driving apparatus for plasma display panel according to an embodiment of the invention;
Figure 13 has shown the structured flowchart of driving apparatus for plasma display panel in accordance with another embodiment of the present invention.
Embodiment
Fig. 5 A and 5B represent the frequency curve chart of keeping pulse according to the APL of first embodiment of the invention.
As shown in Figure 4, this APL has and keeps the relation that number of pulses is inversely proportional to.In other words, when APL uprises, a spot ofly keep pulse and be applied to this panel, and when the APL step-down, a large amount of pulses of keeping are applied to this panel.At this moment, in the first embodiment of the present invention, owing to enter into high APL, the cycle of keeping pulse is arranged to linear increase (that is, with the linear reduction of the frequency configuration of keeping pulse) as shown in Figure 5 from low APL.The quantity of keeping pulse of practical application is set in mode same as the prior art here.
Especially, in low APL, with the individual pulse application of keeping of i (for example 1024) to this panel.In this case, have with frequency f 2 be inversely proportional to the relation the period T of keeping pulse 2 have narrow width (for example, 5 μ s).In other words, on low APL, i is kept pulse in this way offer panel, so have period T 2.
In other respects, on high APL, j (for example 200) is kept pulse offer this panel.In this case, be to have less value (f1＞f2) with being applied to the frequency configuration of keeping pulse on the high APL.Therefore, have with frequency f 1 be inversely proportional to the relation the period T of keeping pulse 1 have wide width (for example, 20 μ s).In other words, on high APL, j is kept pulse offer panel, have period T 1 by this way.
In other words, in the first embodiment of the present invention, with the cycle of keeping pulse with the proportional mode increase of APL.If to increase the cycle that this keeps pulse with the proportional mode of APL, even so at high APL, idle interval can not broaden yet, thereby strengthened and kept the driving surplus.
Determine to advance the speed by testing with proportional cycle of keeping pulse of this APL.In fact, according to the resolution of this PDP and length etc., with cycle of keeping pulse of the proportional increase of APL by different settings.For example, if on maximum APL, apply the pulse of keeping, then have 5.5 μ s keeping pulse and can be applied on the minimum APL to 15 μ s cycles with 5 μ s cycles.In other words, in first embodiment, if be increased from minimum APL to the cycle that maximum APL should keep pulse, it can increase about 0.7 μ s to 10 μ s so.
And, in first embodiment, this APL is divided into a plurality of territory elements, and in response to these territory elements, can increase this cycle of keeping pulse.In other words, in first embodiment, dotted line from Fig. 5 is divided into a plurality of zones with this APL as can be seen, and have keeping pulse and can being applied on the APL that is included in the same area of same period, and have keeping pulse and can being applied on the APL that is included in the zones of different of different cycles.Here, because the APL that is included in the zones of different is higher, therefore, keep more that cycle of pulse also increases.
Simultaneously, in first embodiment, various strategies can be used for setting up widely to be kept the recurrence interval.For example, shown in Fig. 6 A and Fig. 6 B, the high width of keeping pulse only can increase to be provided with widely to be kept the recurrence interval.
Clearer and more definite is shown in Fig. 6 A and Fig. 6 B, owing to enter into high APL from low APL, to increase the high width of keeping pulse and keep the recurrence interval to be provided with widely.If it is extended to keep the high width of pulse, might cause the stable discharge of keeping so.In other words, if it is extended to keep the high width of pulse, can produces the time of keeping discharge so and become big, thereby can cause that the probability of keeping discharge increases.
Selectable, in first embodiment, dotted line from Fig. 6 A as can be seen, this APL is divided into a plurality of zones, and the pulse of keeping that will have identical high width is applied among the APL that is included in same area, and the pulse of keeping that will have a different cycles is applied among the APL that is included in zones of different.
In addition, in first embodiment, such increasing that the low width of keeping pulse only can be shown in Fig. 7 A and Fig. 7 B is used for setting up widely the purpose of keeping the recurrence interval.Especially, shown in Fig. 7 A and Fig. 7 B,, keep the low width of pulse and can faster increase keep the recurrence interval to be provided with widely owing to enter into high APL from low APL.If keep the low width and the proportional expansion of APL of pulse, might prevent that idle interval increases in high APL, cause the stable discharge of keeping thus.In other words, if keep the low width and the proportional expansion of APL of pulse, idle interval and APL keep irrelevant so, can not be almost constant in this idle interval apply any pulse of keeping.If do not have extendedly corresponding to the idle interval of high APL, might cause the stable discharge of keeping so.
On the other hand, in first embodiment, the dotted line from Fig. 7 A this APL as can be seen is divided into a plurality of zones, and keep the low width of pulse can be extended.Especially, in first embodiment, this APL is divided into a plurality of zones shown in the dotted line of Fig. 7 A, and the pulse of keeping that will have an identical low width is applied on the APL that is included in the same zone, and has keeping pulse and being applied on the APL that is included in the zones of different of different low width.Selectable, in first embodiment, when it entered into high APL from hanging down APL, low width and the high width of keeping pulse can be exaggerated, and were provided with widely thus and kept the recurrence interval.
Fig. 8 A and Fig. 8 B are according to the frequency curve chart of keeping pulse of APL in the expression second embodiment of the invention.
Referring to Fig. 8 A and Fig. 8 B, in the second embodiment of the present invention, when it enters into high APL from hanging down APL, keep the linear increase of cycle (that is, keeping the linear reduction of frequency of pulse) of pulse.Further, in the second embodiment of the present invention, minimum qualification frequency f 3 (that is, maximum is kept recurrence interval T3) is set, and when this APL is increased to above predetermined value, will has the minimum pulse of keeping that limits frequency f 3 and be applied in this panel.
Especially, in a second embodiment, the cycle of keeping pulse is set to this APL proportional.In other words, when this APL was increased, the cycle of keeping pulse also was increased, and kept the cycle even also can make full use of this thus on high APL.
And, in a second embodiment, when APL becomes when surpassing specific rank, be provided with and minimumly limit frequency f 3 so that keep the cycle of pulse and can remain unchanged.For example, if minimum qualification frequency f 3 is set so that keep the cycle that pulse has 15 μ s, the pulse of keeping that will have for 15 μ s cycles so is applied to above on other APL of a specific order.In other words,, only change this quantity of keeping pulse (when APL uprised, this quantity of keeping pulse was reduced as shown in Figure 4), and remain unchanged the cycle (or frequency) of keeping pulse surpassing on other APL of a specific order.Here, by the deviser this minimum is set in advance and limits frequency f 3, so that on high APL, can guarantee enough surpluses of keeping.In other words, be provided with to experience this minimum limit frequency f 3 in case guarantee enough and length (that is inch) and resolution etc. relevant keep surplus.In fact, because the resolution of PDP and length (that is, inch) etc. can difference be provided with this minimum qualification frequency f 3, so that this PDP can carry out stable operation.For example, be applied on the minimum APL, the minimum frequency f 3 that limits can be set so, become about 5.5 μ s to 15 μ s so that keep the maximum cycle of pulse if will have the pulse of keeping in 0.5 μ s cycle.In other words, in a second embodiment, this qualification frequency f 3 is set so that this cycle of keeping pulse of cycle from be applied to minimum APL of keeping pulse increases about 0.5 μ s to 10 μ s.
In the second embodiment of the present invention, keep the cycle and proportional linear the increasing of APL of pulse, so that might prevent that idle interval from enlarging on APL, and the driving surplus is kept in enhancing thus.And, be provided with that this minimum limits frequency f 3 so that all keep pulse and can be applied to predetermined keeping in the cycle, cause the stable discharge of keeping thus.
Fig. 9 A and Fig. 9 B are according to the cyclic curve figure that keeps pulse of APL in the expression third embodiment of the invention.
Referring to Fig. 9 A and Fig. 9 B, in the third embodiment of the present invention, when when low APL enters into high APL, the cycle of keeping pulse is linear increasing (that is, keeping the linear reduction of frequency of pulse).Further, in the third embodiment of the present invention, maximum qualification frequency f 4 (that is, minimum is kept recurrence interval T4) is set, so that the quantity of keeping pulse that is applied on the low APL panel can be set alternatively.
In other words, in the 3rd embodiment, maximum is limited the specific rank that frequency f 4 is set to APL, so that the quantity of keeping pulse that can be applied on the minimum APL panel can be set alternatively.For example, the maximum frequency that limits can be set, keep pulse and can be applied to minimum APL (on the panel of f4＞f2) will have j (for example, 1500) greater than I (for example, 1024) value.In this case, be inversely proportional to the maximum frequency f 4 that limits owing to keep the cycle of pulse, it has narrow width T4 (for example, 3 μ s).As mentioned above,, make a large amount of pulses of keeping be applied on the panel, might improve the peak brightness of panel so if maximum limits very high that frequency f 4 is set up.
On the other hand, on high APL, j (for example 200) is kept pulse be applied on the panel.In this case, the frequency f of keeping pulse 1 that is applied among the high APL is set to have lower value.Therefore, have with frequency f 1 be inversely proportional to the relation the period T of keeping pulse 1 have the value (for example, 20 μ s) of broad.In other words, this j is kept pulse be applied in the panel, so when high APL, have period T 1.
As mentioned above, in the 3rd embodiment, keep the cycle and proportional linear the increasing of APL of pulse, improve emission efficiency thus.And the third embodiment of the present invention is provided with the maximum frequency f 4 that limits, and to apply a large amount of pulses of keeping when hanging down APL, therefore improves the peak brightness of panel.
Selectable, shown in Figure 10 A and Figure 10 B, in an embodiment of the present invention, this maximum can be set simultaneously limit frequency f 4 and the minimum frequency f 3 that limits.As shown in Figure 8, this maximum is set simultaneously limits frequency f 4 and the minimum frequency f 3 that limits,, and cause the stable discharge of keeping so that might improve the peak brightness of panel.
In the embodiments of the invention shown in Fig. 5 A, Fig. 6 A, Fig. 7 A, Fig. 8 A, Fig. 9 A, Figure 10 A, increase or reduce frequency (or cycle) therebetween, according to APL is linear.But when the present invention applied to PDP, as shown in figure 11, frequency (or cycle) was with the step-by-step system increase consistent with APL or reduces.Especially, if increase or reduce frequency according to APL is linear, (K of f2＞f5＞f1) keeps on the specific rank 50 that pulse should be applied in APL to have frequency f 5.Here, if this APL linear increase or reduces, frequency f 5 (or cycle) can be set to have the real number of radix point so.Yet,, frequency f 5 is arranged to integer by diminishing method owing to can not apply the frequency that comprises radix point.In other words, when the actual execution of the present invention,, use the step-by-step system corresponding to increase or reduce frequency (or cycle) with APL owing to frequency is set by diminishing method.
Figure 12 has shown the structured flowchart of driving apparatus for plasma display panel according to an embodiment of the invention.
Referring to Figure 12, this PDP drive unit comprises the first reverse gamma corrector 52A that is connected between incoming line 61 and the panel 66, gain control 54, mistake fan diffuser 56, a son map unit 58 and data adjuster 60, and be connected frame memory 51, the second reverse gamma corrector 52B between incoming line 61 and the panel 66, average picture grade (APL) unit 62, frequency/period is provided with unit 68 and waveform generator 64.
This first and second reverse gamma corrector 52A and 52B carry out the reverse gray correction of the vision signal of gray correction, thus according to the grey scale linear of this vision signal ground transformed luminance value.R, G and the B data of a frame of this frame memory 51 storages, and the data of storage are offered the second reverse gamma corrector 52B.
This APL unit 62 receives the vision signal of being proofreaied and correct by the second reverse gamma corrector 52B, is used to control the quantity of keeping pulse with generation N-rank signal when N (wherein integer).This gain controller 54 amplifies the video data of being proofreaied and correct by the first reverse gamma corrector 52A by actual gain.
This mistake fan diffuser 56 is diffused into adjacent cells to carry out the fine setting of brightness value with the wrong composition of this unit.This child field map unit 58 heavily distributes the vision signal from the correction of mistake fan diffuser to be used for each son field.
These data adjuster 60 conversions will be suitable for producing the resolution format of panel 66 by this way by the vision signal of a son map unit 58 inputs, and it is offered the address drive integrated circult (IC) of panel 66.
This frequency/period is provided with pulse is determined to keep in unit 68 in response to the APL that is provided by APL unit 62 frequency/period.For example, to shown in Fig. 7 B, this frequency/period is provided with unit 68 cycle of keeping pulse is set as Fig. 5 A, so that have keeping pulse and being employed of broad cycle when APL is higher.Here, this frequency/period is provided with unit 68 and is provided with widely and proportional high width and/or the low width of keeping pulse of APL, widens the cycle that this keeps pulse thus.
This waveform generator 64 uses the N rank signal of 62 inputs from the APL unit to produce timing controling signal.At this moment, this waveform generator 64 is provided with the frequency of keeping pulse based on the frequency configuration signal of keeping pulse that unit 68 is set by frequency/period provides.To be applied to addressing drive IC, the turntable driving IC of panel 66 and keep drive IC by the timing controling signal that waveform generator 64 produces.
Figure 13 has shown the structured flowchart of driving apparatus for plasma display panel in accordance with another embodiment of the present invention.
Referring to Figure 13, this PDP drive unit comprises the first reverse gamma corrector 72A that is connected between incoming line 81 and the panel 86, gain control 74, mistake fan diffuser 76, a son map unit 78 and data adjuster 80, and be connected frame memory 71, the second reverse gamma corrector 72B between incoming line 81 and the panel 86, average picture grade (APL) unit 72, frequency/period is provided with unit 78, limit value is provided with unit 90 and waveform generator 84.
This first and second reverse gamma corrector 72A and 72B carry out the reverse gray correction of gray correction vision signal, come the linear transformation brightness value according to the gray level of this vision signal thus.R, G and the B data of a frame of this frame memory 71 storages, and the data of storage are offered the second reverse gamma corrector 72B.
This APL unit 82 receives the vision signal of being proofreaied and correct by the second reverse gamma corrector 72B, is used to control the quantity of keeping pulse to produce N-rank signals (wherein N is an integer).This gain controller 74 amplifies the video data of being proofreaied and correct by the first reverse gamma corrector 72A by actual gain.
This mistake fan diffuser 76 is diffused into adjacent cells to carry out the fine setting of brightness value with the wrong composition of this unit.This child field map unit 78 heavily distributes the vision signal from the correction of mistake fan diffuser 76 to be used for each son field.
These data adjuster 80 conversions are made by this way to be applicable to the resolution format that produces panel 66, and it are offered the address drive integrated circult (IC) of panel 86 by the vision signal of a son map unit 78 inputs.
This limit value is provided with unit 90 and maximum limit definite value and/or irreducible minimum definite value is set to frequency/period unit 78 is set.
This frequency/period is provided with pulse is determined to keep in unit 88 in response to the APL that is provided by APL unit 82 frequency/period.For example, to shown in Fig. 7 B, this frequency/period is provided with unit 88 frequency/period of keeping pulse is set, so that when APL was higher, this was kept pulse and has the broad cycle as Fig. 5 A.Here, this frequency/period is provided with the setting and the proportional high width and/or the low width of keeping pulse of APL of unit 88 broad sense, enlarges the cycle that this keeps pulse thus.Further, to shown in the 10B, this frequency/period is provided with unit 88 and uses the maximum limit definite value and/or the irreducible minimum definite value that unit 90 is set is provided by limit value that the frequency/period of keeping pulse is set as Fig. 8 A.
This waveform generator 84 uses the N rank signal by 82 inputs of APL unit to produce timing controling signal.At this moment, this waveform generator 84 is provided with the frequency of keeping pulse based on the frequency configuration signal of keeping pulse that unit 88 is set by frequency/period provides.To be applied to addressing drive IC, the turntable driving IC of panel 86 and keep drive IC by the timing controling signal that waveform generator 84 produces.
As mentioned above,,, provide the pulse of keeping, improve emission efficiency thus with broad cycle along with APL becomes big according to the present invention.And, by being set, high minimum limits frequency, can on low APL, apply a large amount of pulses of keeping, improve the peak brightness of panel thus.In addition,, the maximum frequency that limits is set, causes the stable discharge of keeping thus so that guarantee the constant surplus of keeping according to the present invention.
Although the present invention illustrates by the embodiment that is presented in the above-mentioned accompanying drawing, be to be understood that for those of ordinary skills and the invention is not restricted to this embodiment, under the situation that does not break away from spirit of the present invention, possible during to its variations and modifications of carrying out.Therefore, scope of the present invention only should be determined by additional claim and their equivalent.
Claims (16)
1. method that drives plasma display panel, this method may further comprise the steps:
Setting is in response to the quantity of keeping pulse of average picture grade;
The cycle of pulse is kept in setting,
It is characterized in that:
Only be arranged on the high width of keeping pulse that changes in the subregion at least of described average picture grade.
2. method that drives plasma display panel may further comprise the steps:
The quantity of keeping pulse of the average picture grade of response is set;
The cycle of pulse is kept in setting,
It is characterized in that:
Only be arranged on the low width of keeping pulse that changes in the subregion at least of described average picture grade.
3. the method for claim 1, the step that the cycle of pulse is kept in wherein said setting comprises:
Be provided with basically and the proportional high width of keeping pulse of average picture grade.
4. method as claimed in claim 2, the step that the cycle of pulse is kept in wherein said setting comprises:
Be provided with basically and the proportional low width of keeping pulse of average picture grade.
5. method as claimed in claim 1 or 2, the step that the quantity of pulse is kept in wherein said setting comprises:
The quantity of keeping pulse that is inversely proportional to average picture grade is set.
6. method as claimed in claim 1 or 2, the maximum cycle of wherein keeping pulse than wide 0.5 μ s of the minimum period of keeping pulse to 10 μ s.
7. method as claimed in claim 1 or 2 further comprises step:
On more than desired average picture grade, the least restrictive frequency is set, so that the described cycle of keeping pulse keeps constant.
8. method as claimed in claim 7 wherein is provided with described least restrictive frequency so that compare with the minimum period of keeping pulse, and this extended 0.5 μ s of maximum cycle that keeps pulse is to 10 μ s.
9. method as claimed in claim 1 or 2 further may further comprise the steps:
On less than desired average picture grade, the highest qualification frequency is set, so that the described cycle of keeping pulse keeps constant.
10. method as claimed in claim 1 or 2, wherein when described average picture grade when low grade enters into high grade, the mode of described cycle of keeping pulse with stepping increases.
11. the driving arrangement of a plasma display panel comprises:
Stage arrangements such as average picture are used to be provided with the average picture grade corresponding to video data; With
The cycle setting device is used to be provided with the cycle of keeping pulse,
It is characterized in that:
Described cycle setting device only is arranged on the high width of keeping pulse that changes in the subregion at least of described average picture grade.
12. the driving arrangement of a plasma display panel comprises:
Stage arrangements such as average picture are used to be provided with the average picture grade corresponding to video data; With
The cycle setting device is used to be provided with the cycle of keeping pulse,
It is characterized in that:
Described cycle setting device only is arranged on the low width of keeping pulse that changes in the subregion at least of described average picture grade.
13. drive unit as claimed in claim 11, wherein said cycle setting device setting and the proportional high width of keeping pulse of described average picture grade.
14. drive unit as claimed in claim 12, wherein said cycle setting device setting and the proportional low width of keeping pulse of described average picture grade.
15., further comprise as claim 11 or 12 described drive units:
The limit value setting device is used for being provided with and can enlarges this maximum limit definite value of keeping the recurrence interval and can dwindle at least one of this irreducible minimum definite value of keeping the recurrence interval.
16. as claim 11 or 12 described drive units, wherein said cycle setting device receives at least one in maximum limit definite value and the irreducible minimum definite value, to control the described cycle of keeping pulse.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20020060042 | 2002-10-02 | ||
| KR60042/2002 | 2002-10-02 | ||
| KR67170/2003 | 2003-09-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1497519A CN1497519A (en) | 2004-05-19 |
| CN1287344C true CN1287344C (en) | 2006-11-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101007368A Expired - Fee Related CN1287344C (en) | 2002-10-02 | 2003-10-08 | Method and device for driving plasma display panel |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR20040030316A (en) |
| CN (1) | CN1287344C (en) |
| DE (1) | DE60323025D1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100651946B1 (en) * | 2004-09-22 | 2006-12-06 | 엘지전자 주식회사 | Apparatus and method for adjusting color temperature of PDP |
| KR100563467B1 (en) * | 2004-12-09 | 2006-03-23 | 엘지전자 주식회사 | Method for driving plasma display panel |
| KR100759461B1 (en) | 2005-12-30 | 2007-09-20 | 삼성에스디아이 주식회사 | Plasma display and driving method thereof |
| KR100822213B1 (en) * | 2007-01-19 | 2008-04-17 | 삼성에스디아이 주식회사 | Method and apparatus of driving plasma display panel |
| KR102253677B1 (en) * | 2014-11-04 | 2021-05-21 | 엘지디스플레이 주식회사 | Display Device and Driving Method thereof |
-
2003
- 2003-09-27 KR KR1020030067170A patent/KR20040030316A/en active Search and Examination
- 2003-10-02 DE DE60323025T patent/DE60323025D1/en not_active Expired - Lifetime
- 2003-10-08 CN CNB2003101007368A patent/CN1287344C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| KR20040030316A (en) | 2004-04-09 |
| DE60323025D1 (en) | 2008-10-02 |
| CN1497519A (en) | 2004-05-19 |
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