CN101174378A

CN101174378A - Plasma display and controlling device and method thereof

Info

Publication number: CN101174378A
Application number: CNA2007100847408A
Authority: CN
Inventors: 姜太京
Original assignee: Samsung SDI Co Ltd
Current assignee: Samsung SDI Co Ltd
Priority date: 2006-11-02
Filing date: 2007-02-28
Publication date: 2008-05-07
Anticipated expiration: 2027-02-28
Also published as: KR20080040148A; EP1918903B1; CN100576298C; KR100869797B1; EP1918903A1; DE602007001762D1

Abstract

The present invention relates to a plasma display, and a controller and driving method thereof. In the driving method for sequentially driving a plasma display by a plurality of subfields divided into first and second subfield groups from one frame, a) it is determined whether at least one subfield to be turned on is included in one subfield group among the first and second subfield groups, b) a subfield turn-on time control signal for controlling a turn-on time of the subfield to be turned on is generated according to a determined result in a), and c) the subfield is turned on at the turn-on time corresponding to the subfield turn-on time control signal.

Description

Plasma scope, control device and driving method

Technical field

The present invention relates to plasma scope, controller and driving method thereof.

Background technology

Plasma scope uses plasma display (PDP), and PDP utilizes the plasma that produces by process gas discharge to come character display or image.PDP comprises that according to its size the hundreds of of arranging with matrix pattern is to millions of pixels.

In National Television System Committee (NTSC) (NTSC) method of using the 60Hz frequency, a frame time is 16.67ms (that is, 1/60 second), and in line-by-line inversion (PAL) method of using the 50Hz frequency, a frame time is 20ms (that is, 1/50 second).

Because the frame time long enough of 20ms makes people can perceive the image modification in the PAL method, so people can watch screen to glimmer every 20ms.That is to say, in the PAL method, scintillation can occur.

In order to prevent flicker effects, a frame is divided into first group and second group, and the son field that will have than big weighted value is applied to this two groups individually.

Fig. 1 shows a son view of arranging of a frame in the expression conventional P AL method.

As shown in Figure 1, the frame in the plasma scope of conventional P AL method comprises first group and second group, and son SF1, SF3, SF5 and SF7 are applied to first group, and son SF2, SF4, SF6 and SF8 are applied to second group.That is to say that first group is divided into a plurality of son that respectively has different luminance weights values respectively with second group, each son SF1 to SF8 comprises address period A1 to A8 and keeps phase S1 to S8.

Address period A1 to A8 is used for selecting the unit (that is, will by the unit of gating or shutoff) of gating/shutoff panel, keeps phase S1 to S8 and is used to cause that discharge is with display image on the unit of discharge.Here, the length of keeping phase S1 to S8 is corresponding with the weighted value of each son SF1 to SF8, supposes that the length of keeping phase S1 to S8 is respectively 1T, 2T, 4T, 8T, 16T, 32T, 64T and 128T.In addition, can before address period A1 to A8, be provided for making the initialized replacement of discharge cell phase (not shown).

Here, weighted value and determine will be by the GTG of the discharge cell of gating.As shown in Figure 1, a son SF1 to SF8 arranges by the ascending order of weight or by the descending of weight.

In PAL method as shown in Figure 1, be divided into two groups owing to have the son field of big weighted value, so people can perceive the image change every 10ms, therefore, can reduce the influence of flicker.

The brightness that Fig. 2 A, Fig. 2 B and Fig. 2 C show according to the layout of the son field that forms a frame in the conventional P AL method shown in Fig. 1 changes.

Fig. 2 A, Fig. 2 B and Fig. 2 C show the view that the brightness in the frame changes in the expression conventional P AL method.

In Fig. 2 A, Fig. 2 B and Fig. 2 C, a frame time is 20ms, and 10ms is applied to first group and second group respectively.In first group and second group, owing to arrange son SF1, SF3, SF5 and SF7 and son SF2, SF4, SF6 and SF8, so brightness is bigger in every group of son after from low weighted value to high weighted value.

In Fig. 2 A, the son in first group and second group is by gating.In addition, plasma scope can be by coming presentation video on PDP according to the son (being illustrated among Fig. 2 B and Fig. 2 C) in a group in first group and second group of the GTG gating of image.That is to say that the son field in Fig. 2 B in first group is by gating, the son field in Fig. 2 C in second group is by gating.

Fig. 3 A and Fig. 3 B show the former frame of frame of the son in two groups of the gatings of expression one group and the view of the relation between one frame of back.

In Fig. 3 A, the image of first frame and the 3rd frame is represented in the son field in first group and second group of the gating, and shown in Fig. 2 A, the image of second frame is represented in the son field in first group of the gating, shown in Fig. 2 B.In Fig. 3 B, the image of first frame and the 3rd frame is represented in the son field in first group and second group of the gating, and the image of son expression second frame in second group of the gating is shown in Fig. 2 C.

In Fig. 3 A, keep discharge owing in first group of second frame son, produced, do not keep discharge and in second group son of second frame, produce, produce mis-ignition so in first group of the 3rd frame subsequently, have problem ground.In Fig. 3 B, owing in first group son field of second frame, do not produce and keep discharge, so formerly produced the time delay of keeping discharge between second group of second of first frame group and second frame, therefore, in second group of second frame, had problem ground and produce mis-ignition.

Disclosed above-mentioned information only is in order to improve the understanding to background of the present invention in background technology part, so it can comprise the information that is not formed in the prior art that this country known for those of ordinary skills.

Summary of the invention

The present invention is devoted to provide a kind of be used to prevent plasma scope, the controller of mis-ignition operation and the method that drives it.

Driving the exemplary driver method of plasma scope by an a plurality of sub-field sequence that is divided into first son group and second son group from a frame, a) determining whether to be included in during a son field in described first son group and described second son group organizes by at least one height field of gating; B) according to definite result in a), produce be used to control described will be by a son gating time control signal of the gating time of the son of gating; C) at described with a described son gating time gating that the gating time control signal is corresponding sub.

Comprise son field register control and sub-field data generator by according to the vertical synchronizing signal of first frequency a plurality of sons field being divided into the controller that first son group and second son group drive plasma scope from a frame.A described son register control is included in first son group, is included in second son group or is included in the son field gating time control signal that produces the gating time that is used to control son in two sons group according at least one height field value.Described sub-field data generator sends to a described son register control to represent the GTG of every frame according to vision signal with a son value of described son field, and according to the described gating time of a described son described son of gating time control signal control, and the gating time of control sent to a described son register control.

The exemplary plasma display comprises plasma display (PDP), controller and drive circuit unit.PDP comprise first electrode, second electrode and with the direction of described first electrode and described second electrode crossing on third electrode.Controller is divided into frame first son group and the second son field group that comprises a plurality of sons field respectively according to the outside input vertical synchronizing signal of first frequency, and produce according to being included in the described first son field group, described second sub group or two sub the son that changes in organizing a gating time control signal, to represent the GTG of every frame according to incoming video signal by the sub-field of gating.Drive circuit unit drives described first electrode to described third electrode according to the control operation of described controller, to change described sub gating time according to a described son gating time control signal.

Description of drawings

Fig. 2 A to Fig. 2 C shows the view that the brightness in the frame changes in the expression conventional P AL method.

Fig. 4 shows the block diagram of plasma scope according to an exemplary embodiment of the present invention.

Fig. 5 shows and represents the block diagram of the controller of PDP according to an exemplary embodiment of the present invention.

The chart of the GTG when Fig. 6 shows son in first group of the gating of expression.

Fig. 7 shows the view of the son field gating control operation of representing to import a son register control when having the vision signal of GTG shown in Figure 6.

Fig. 8 shows the expression gating form of the GTG the during son in second group according to an exemplary embodiment of the present invention.

Fig. 9 shows the view of the son field gating control operation of representing to import a son register control when having the vision signal of GTG shown in Figure 8.

Figure 10 shows and represents the process flow diagram of a son gating time control operation of controller according to an exemplary embodiment of the present invention.

Embodiment

In the following detailed description, just the mode by illustrating has illustrated and has described some exemplary embodiment of the present invention.Just as the skilled personnel to recognize, under all situations that does not break away from the spirit or scope of the present invention, can make amendment to the embodiment that describes in various mode.Therefore, accompanying drawing and describe is considered to illustrating property in essence, rather than restrictive.In whole instructions, identical label is represented components identical.

In following whole instructions and claims, when the description element " combined " with another element, this element can " directly combine " with other element, perhaps also can be by three element and other element " electricity combines ".

In addition, the wall electric charge of mentioning in the following description refers at the wall (for example, dielectric layer) of the electrode of close discharge cell and goes up the electric charge that forms and accumulate.In fact and non-contact electrode the wall electric charge will be described to " formation " or " accumulation " on electrode, although the wall electric charge.In addition, wall voltage refers to the electric potential difference that forms by the wall electric charge on the wall of discharge cell.In following whole instructions and claims, unless be described as the opposite meaning clearly, word " comprises/comprise " and will be understood that hint comprises described element, and does not get rid of any other element.

Now with reference to accompanying drawing plasma scope, controller and driving method thereof are according to an exemplary embodiment of the present invention described.

As shown in Figure 4, plasma scope comprises plasma display (PDP) 100, controller 200, addressing electrode driver 300, scan electrode driver 400 and keeps electrode driver 500 according to an exemplary embodiment of the present invention.

PDP 100 comprises a plurality of at the addressing electrode A1 to Am that extends on the column direction and a plurality of pairs of sustain electrodes X1 to Xn that extends on line direction and scan electrode Y1 to Yn.Keep electrode X1 to Xn and form, and the end of keeping electrode X1 to Xn connects altogether corresponding to each scan electrode Y1 to Yn.In addition, PDP 100 comprises having the substrate (not shown) of keeping electrode X1 to Xn and scan electrode Y1 to Yn and the substrate (not shown) with addressing electrode A1 to Am.Two substrates arrange with facing with each other and have discharge space between them, make scan electrode Y1 to Yn and keep electrode X1 to Xn and can intersect with addressing electrode A1 to Am.Here, the discharge space that is provided with in the intersection region of addressing electrode and X electrode and Y electrode forms discharge cell.The plasma display 100 of this structure is an example, and the panel of other structure of the drive waveforms that application will be described can be applicable to the present invention.

Controller 200 receives outer video signals, and output addressing drive control signal Sa, keeps electrode drive control signal Sx and scan electrode drive control signal Sy.In addition, controller 200 is divided into a plurality of sons field with a frame, and each son field has replacement phase, address period by the time mode and keeps the phase.

After slave controller 200 receives addressing drive control signal Sa, addressing electrode driver 300 will be used to select the display data signal of the discharge cell that will show to be applied to each addressing electrode A1 to Am.

Scan electrode driver 400 slave controllers 200 receive scan electrode drive control signal Sy, and driving voltage is applied to scan electrode Y.

Keep electrode driver 500 slave controllers 200 and receive and keep electrode drive control signal Sx, and driving voltage is applied to keeps electrode X.

As shown in Figure 5, the controller 200 of PDP comprises a sub-field data generator 220 and a son register control 240 according to an exemplary embodiment of the present invention.

Sub-field data generator 220 sends to control signal scan electrode driver 400 and keeps electrode driver 500, thus son SF2, SF4, SF6 and SF8 in son SF1, SF3, SF5 and SF7 in first group and second group according to the GTG of every frame by gating.

Sub-field data generator 220 sends to a son register control 240 with the information of the son field of gating, the son gating timing control signal that reception is produced by son register control 240, and the control signal that will be used for the son of gating correspondence sends to scan electrode driver 400 and keeps electrode driver 500.

Whether a son register control 240 definite information about a plurality of sub that receive from sub-field data generator 220 comprise the son field first group and second group, perhaps whether comprise son field SF1, SF3, SF5 and SF7 or son SF2, SF4, SF6 and SF8 in a group in two groups.According to the result who determines, when input information comprise in first group the son the time, a son register control 240 produces a son gating timing control signal that is used for the gating time delay scheduled time of son field, when this input information comprise in second group the son the time, a son register control 240 produces a son gating timing control signal that is used for the gating time of son field is shifted to an earlier date the schedule time, and a son register control 240 sends to sub-field data generator 220 with a son field gating timing control signal.In addition, when the information that receives comprised son in first group and second group, a son register control 240 produced a son gating timing control signal, but the gating time of son does not change.

Sub the gating time of being controlled by a son register control 240 shown in Figure 5 is described now with reference to Fig. 6 to Fig. 9.

The view of a son gating control operation of a son register control 240 when the chart of the GTG when Fig. 6 shows son in first group of the gating, Fig. 7 show the expression input and have the vision signal of GTG shown in Figure 6.

GTG shown in Fig. 6 is corresponding with second frame between first frame shown in Fig. 7 and the 3rd frame, supposes that gating has dark-

coloured GTG

1,4,5,16,17,20 and 21 vision signal in second frame.

As shown in Figure 7, sub-field data generator 220 notice register control 240 gatings SF1, SF3 and SF5, because the sub-field information that receives comprises the sub-field in first group, so a son register control 240 is with the gating time delay preset time of son field.

Fig. 8 shows the expression gating form of the GTG the during son in second group according to an exemplary embodiment of the present invention, the view of a son gating control operation of a son register control 240 when Fig. 9 shows the expression input and has the vision signal of GTG shown in Figure 8.

GTG is corresponding with first frame and second frame between the 3rd frame shown in Figure 9, and gating has dark-

coloured GTG

2,8,10,32,34,40 and 42 vision signal in second frame.

As shown in Figure 9, sub-field data generator 220 notice register control 240 gatings SF2, SF4 and SF6, because the sub-field information that receives comprises the son in second group, so a son register control 240 shifts to an earlier date preset time with the gating time of son.

Figure 10 shows and represents the process flow diagram of a son gating time control operation of controller 200 according to an exemplary embodiment of the present invention.

At first, the sub-field data generator 220 of receiving video signals is with the number N initialization (step S602) of frame.In this case, the number N of frame exemplarily is initialized as 1 (in Figure 10), but also can use other natural number, prime number or have the value of book character (for example, alphabet).In addition, at step S602, when plasma scope when holding state is opened, controller 200 can be from beginning to carry out a son gating time control operation by first frame that uses incoming video signal to produce, and because vision signal is continuously input, so, the number of frame can carry out initialization operation when being increased to when being higher than predetermined value sub-field data generator 220.

The sub-field data generator 220 of carrying out initialization operation at step S602 sends to son field register control 240 according to GTG with the son value of gating, described GTG will be indicated in the frame according to vision signal, at step S604, whether son register control 240 true stator field values comprise the sub-field in son in first group and second group.

When the expression of the son in the GTG of determining corresponding frame according to definite result in step S604 a group in by first group and second group, a son register control 240 determines whether a son value that receives comprises the son field (step S606) in first group.

When a son value of determining according to definite result in step S606 to receive comprises son field in first group, a son register control 240 produces a son gating time control signal that is used for a son gating time delay scheduled time, and this signal is sent to sub-field data generator 220 (step S608).When son the value of determining to receive does not comprise son field in first group, son register control 240 a true stator field value comprise the son field in second group, and produce a son gating time control signal that is used for a son gating time is shifted to an earlier date the schedule time, and this signal is sent to sub-field data generator 220 (step S610).

In addition,, can set up and determine whether a son value that receives comprises the son field in second group at step S606, and under these circumstances, step S608 and S610 change.

When the son in first group and second group of the frame of determining the gating correspondence according to the definite result among the step S604, a son register control 240 produces a son gating time control signal that is used for sub of gating correspondence and does not change gating time, and this signal is sent to sub-field data generator 220.Sub-field data generator 220 in step S604, S608 or a S610 reception gating time control signal sends to control signal scan electrode driver 400 and keeps electrode driver 500, thereby at step S612, with the gating time of son the gating control of correspondence.

Determine the gating time of corresponding frame and the number (step S614) of the sub-field data generator of transmit control signal (step S612) 220 increase frames, and execution in step S604.

As mentioned above, be divided in the frame of first group of respectively having different weighted values and second group the son in a group in first group and second group of the gating at Jiang Zichang.Therefore, mis-ignition can be prevented, and plasma scope can be stably driven.

Although described the present invention in conjunction with being considered to actual exemplary embodiment at present, but should be appreciated that and the invention is not restricted to disclosed embodiment, and opposite, the invention is intended to cover various modifications and equivalent arrangement in the spirit and scope that are included in claim.

Claims

1. one kind by being divided into the driving method that first son group and second son group come to drive in proper order plasma scope from a frame with a plurality of son fields, and described driving method comprises:

A) determine whether to be included in during a son in described first son group and described second son group organizes by at least one height field of gating;

B) according to the result who in a), determines, produce be used to control described will be by a son gating time control signal of the gating time of the son of gating;

C) at described with a described son gating time gating that the gating time control signal is corresponding sub.

2. driving method according to claim 1, wherein, at b) in, described will be included in described first son group by the son field of gating the time when in a), determining, produce be used for described will be by a son gating time control signal of the described gating time delay scheduled time of the son of gating.

3. driving method according to claim 1, wherein, at b) in, described will be included in described second son group by the son field of gating the time when in a), determining, produce and be used for the son gating time control signal that will be shifted to an earlier date the schedule time by the described gating time of the son of gating described.

4. according to claim 1 each described method to the claim 3, wherein, at b) in, described will be included in described first son group and described second son group by the son field of gating the time when in a), determining, produce the son field gating time control signal that is used for the described son of gating and does not change described gating time.

5. organize the controller that drives plasma scope by according to the vertical synchronizing signal of first frequency a plurality of sons field being divided into first son group and second son from a frame for one kind, described controller comprises:

Son register control is used for being included in first son group, being included in second son group or being included in the son field gating time control signal that produces the gating time that is used to control son in two sons group according at least one height field value;

Sub-field data generator, be used for just being sent to a described son register control to represent the GTG of every frame according to vision signal by a son value of the son field of gating, and according to the described gating time of a described son described son of gating time control signal control, and the gating time of control sent to a described son register control.

6. controller according to claim 5, wherein, in the time will being included in described first son group by the son field of gating, a described son gating time control signal postpones described gating time, in the time will being included in described second son group by the son field of gating, a described son gating time control signal shifts to an earlier date described gating time.

7. controller according to claim 5, wherein, in the time will being included in described first son group and described second son group by the son field of gating, a described son gating time control signal keeps described gating time.

8. controller according to claim 5, wherein, described first frequency is the vertical synchronizing frequency of line-by-line inversion method.

9. plasma scope comprises:

Plasma display, comprise first electrode, second electrode and with the direction of described first electrode and described second electrode crossing on third electrode;

Controller, outside input vertical synchronizing signal according to first frequency is divided into frame first son group and the second son field group that comprises a plurality of sons field respectively, and produce according to being included in the described first son field group, described second sub group or two sub the son that changes in organizing a gating time control signal, to represent the GTG of every frame according to incoming video signal by the sub-field of gating;

Drive circuit unit is used for driving described first electrode to described third electrode according to the control operation of described controller, to change described sub gating time according to a described son gating time control signal.

10. plasma scope according to claim 9, wherein, in the time will being included in described first son group by the son field of gating, a described son gating time control signal postpones described gating time, in the time will being included in described second son group by the son field of gating, a described son gating time control signal shifts to an earlier date described gating time.

11. plasma scope according to claim 9, wherein, in the time will being included in described first son group and described second son group by the son field of gating, a described son gating time control signal keeps described gating time.

12. plasma scope according to claim 9, wherein, described first frequency is the vertical synchronizing frequency of line-by-line inversion method.