KR100757426B1 - Driving Method of Energy Recovery Circuit of Plasma Display Panel - Google Patents

Abstract

According to the present invention, an energy recovery circuit of a plasma display panel capable of achieving high brightness by controlling whether or not an energy recovery circuit is driven or a rising time (er_up time) and a polling time (er_dn time) according to a position at which a sustain pulse is applied during sustain driving. According to a driving method, an operation of an energy recovery circuit differs depending on a position at which a sustain pulse is applied during sustain driving of a panel, and the energy recovery circuit is driven in an odd subfield and an even subfield differently, or a subfield is initially formed. When the middle and the second half are divided, the first and second half operate the same, and the first and the middle half are driven differently, or when the subfield is divided into the first and second half, the first and second half fields are driven differently. High brightness and brightness can be adjusted .

Description

Energy recovery circuit driving method of plasma display panel {METHOD FOR DRIVING ENERGY RECOVERY CIRCUIT OF PLASMA DISPLAY PANEL}

1 is a waveform diagram of an embodiment of a sustain pulse applied to a sustain electrode in a conventional PDP.

Fig. 2 is a block diagram showing an apparatus configuration for performing the method for driving an energy recovery circuit of the present invention PDP.

Figure 3 is an exemplary waveform diagram of a method for driving an energy recovery circuit according to the present invention.

Figure 4 is another exemplary waveform diagram of a method for driving an energy recovery circuit according to the present invention.

Figure 5 is another embodiment waveform diagram of a method for driving an energy recovery circuit according to the present invention.

The present invention relates to a method for driving an energy recovery circuit of a plasma display panel (hereinafter referred to as "PDP"), and in particular, whether or not the energy recovery circuit is driven or rising time (er_up time depending on the position where a sustain pulse is applied during sustain driving. And a polling time (er_dn time) to achieve a high brightness energy recovery circuit driving method of the PDP.

In general, PDP driving is performed by repeatedly driving the reset period, the address (scan) period, and the sustain period. The reset period is a period for uniformizing the state of all cells constituting the panel, and the address period is The display section is a section for determining whether or not to display, and the sustain section is a section for generating sustain (maintenance) discharge of the cell selected and displayed in the address section.

In the sustain period, a sustain pulse is applied to the sustain electrodes (Y and Z electrodes) constituting the panel, and the energy recovered by the energy recovery circuit before the sustain pulse is applied through an energy recovery circuit connected to each of the sustain electrodes (Y and Z) drivers. Is applied to each sustain electrode and then a sustain voltage is applied. After the sustain voltage is applied, the applied energy is recovered and stored in an energy recovery circuit.

Here, the time for applying and recovering energy to each sustain electrode of the panel through the energy recovery circuit has the same time regardless of the portion and subfield to which the sustain pulse is applied. That is, a sustain pulse having the same rising time (supply time) and polling time (recovery time) is applied to the sustain electrode regardless of the position of the subfield and the position where the sustain pulse is applied.

Figure 1 shows an exemplary waveform diagram for the sustain pulse, as shown, the start pulse (①) of the sustain pulse to which the sustain pulse is applied, the pulse of the middle portion (②) and the latter portion (③) It can be seen that the pulse shapes of) are the same.

That is, in the conventional PDP driving method, the energy recovery circuit is operated every time the sustain pulse is applied to the sustain electrode, so that the rising time (t1) is independent of the beginning, middle, and second parts of the sustain period to which the sustain pulse is applied. ) And a sustaining time t2 with the same sustain pulse.

In addition, since the rising time and the polling time of the sustain pulse applied to the sustain electrode in the conventional PDP are the same, the luminance is controlled through the number of sustain pulses applied.

However, since the energy recovery circuit provided in the conventional PDP operates every time a sustain pulse is applied to the sustain electrode, it is difficult to obtain high luminance during initial driving.

Accordingly, the present invention has been made to solve the conventional problems as described above, and does not drive the energy recovery circuit at a predetermined position or order of the sustain pulses applied to the sustain electrode, or the rising time (energy supply time) and polling time ( By controlling the energy recovery time), an object of the present invention is to provide a method for driving an energy recovery circuit of a PDP capable of adjusting initial high brightness and brightness.

The present invention for achieving the above object is characterized in that the operation of the energy recovery circuit is different depending on the position of the sustain pulse is applied when the sustain drive of the panel.

Further, the energy recovery circuit is driven differently in odd and even subfields.

In the energy recovery circuit, when the subfield is divided into a first part, a middle part, and a second part, the first part and the second part are operated in the same manner, and the first part and the middle part are driven differently.

The energy recovery circuit is characterized in that the first half subfield and the second half subfield are driven differently when the subfield is divided into a first half and a second half.

In addition, the energy recovery circuit is characterized in that not driven during the initial number of sustain pulses of the first sub-field.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described.

First, in describing the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

According to the present invention, an initial high brightness can be achieved by controlling the driving of the energy recovery circuit connected to each sustain electrode driver differently depending on the position where the sustain pulse is applied, and the brightness can be adjusted.

The driving of the energy recovery circuit may be determined by the sustain pulse position or order in each subfield or the position or order of the subfield, and the rising time of the sustain pulse may be adjusted for the initial high brightness and the brightness of the present invention. The energy recovery circuit is not driven at the predetermined position.

The presence or absence of driving of the energy recovery circuit may be a number of cases, for example, as follows.

First, the energy recovery circuit is not driven during the initial preset number of sustain pulses in the first subfield to achieve initial high brightness.

Second, the energy recovery circuit is driven in the odd subfield, and the energy recovery circuit is not driven in the even subfield. Of course, it is also possible to drive the energy recovery circuit in the even subfield without driving the energy recovery circuit in the odd subfield.

Third, after dividing the subfield into the first part, the middle part, and the second part, the energy recovery circuit is driven in the middle part and the energy recovery circuit is not driven in the first part and the second part. Of course, it is also possible to operate the energy recovery circuit in the first half and the second half in the opposite case, and not to drive the energy recovery circuit in the middle half.

Fourth, after dividing the subfield into the first half and the second half, the energy recovery circuit is driven in the first half and the energy recovery circuit is not driven in the second half. Of course, it is also possible to operate the energy recovery circuit in the second half, and not drive the energy recovery circuit in the first half.

FIG. 2 is a block diagram showing an apparatus configuration for performing a method for driving an energy recovery circuit of a PDP according to the present invention, wherein the Y electrode energy recovery circuit driver 10, the Y sustain and scan driver 20, and the panel 30 are shown. And the Z electrode energy recovery circuit driver 50 and the Z sustain driver 40.

Of course, although not shown, it is preferable that a control unit (not shown) for outputting a switching control signal for controlling the switching means (not shown) constituting each of the driving units is provided. Since it is a technology that anyone can know, it is not explained in detail.

Referring to FIG. 2, the Y electrode energy recovery circuit driver 10 supplies the recovered energy to the Y electrode constituting the panel 30, and performs the function of recovering energy from the Y electrode.

The Y sustain and scan driver 20 supplies a scan pulse to the Y electrode during the address period and a sustain pulse during the sustain period.

The Z electrode energy recovery circuit driver 50 supplies the recovered energy to the Z electrode constituting the panel 30, and performs the function of recovering energy from the Z electrode.

The Z sustain driver 40 supplies a sustain pulse to the Z electrode during the sustain period.

The driving of the energy recovery circuit drivers 10 and 50 for supplying and recovering energy before and after the sustain pulse is applied to the Y electrode and the Z electrode is performed by the sustain pulse in the subfield position or sequence of the frame or the sustain period of the subfield. It may vary depending on the position, and may be controlled by a control unit that outputs a switch control signal as a method of controlling the energy recovery circuit driver, but not limited to the control method, and may determine whether to drive the energy recovery circuit driver. You can use any method you can.

Figure 3 shows an embodiment waveform of the energy recovery circuit driving method according to the present invention, the sub-field of the frame is divided into the first half (①) and the second half (②), the sustain pulse waveform of the first half and the second half is wrong Able to know.

Referring to FIG. 3, when a frame is composed of eight subfields (sub1 to sub8), the eight subfields are divided into four and the first half subfield (sub1 to sub4) (①) and the second half subfield (sub5 to subfield). Sub8) (2), a sustain pulse in which no energy recovery circuit (energy recovery circuit driver) is driven is applied to the sustain section of the first half subfield, and an energy recovery circuit is applied to the sustain section of the second half subfield. Apply a sustain pulse in the driven state.

That is, the energy supply time (t3) and recovery in the sustain section of the second half without driving the energy recovery circuit to apply a sustain pulse without energy supply time (rising time) and recovery time (polling time) to the sustain section of the first half. The energy recovery circuit is driven to apply a sustain pulse having the time t4.

This method initially increases the peak brightness by eliminating the energy supply time and the recovery time, and when stabilized to some extent, increases the peak brightness and stabilizes the discharge by applying the energy supply time and the recovery time to lower the power consumption.

Of course, the sustain pulse waveforms applied to the sustain periods of the first and second subfields may be interchanged. That is, energy recovery is driven to the sustain section of the first half subfield to apply a sustain pulse having an energy supply time and a recovery time, and a sustain pulse having no energy supply time and recovery time is applied to the sustain section of the second half subfield.

4 shows a waveform of another embodiment of a method for driving an energy recovery circuit according to the present invention, in which a subfield of a frame is divided into an early part (A), a middle part (B), and a second part (C), and a sustain pulse in the middle part. It can be seen that the waveform is different from the sustain pulse waveforms of the first and second parts.

Referring to FIG. 4, the first two subfields of the eight subfields are set as the first half, the next four subfields are set as the midsection, and the last two subfields are set as the subfields of the second half and the first and second subfields are set. A sustain pulse having an energy supply time t3 and a recovery time t4 is applied to the sustain section of, and a sustain pulse without energy supply time and recovery time is applied to the sustain section of the middle subfield.

Of course, the sustain pulse waveforms applied to the first and second parts and the sustain pulse waveforms applied to the middle and second parts may be applied in reverse, and the number of subfields and the sustain pulse waveforms applied to the first, middle and second parts may be changed according to circumstances.

FIG. 5 is a view illustrating another waveform of a method of driving an energy recovery circuit according to the present invention, wherein only a predetermined number of sustain pulses applied to a sustain period of a first subfield (sub1) is supplied with an energy supply time and a recovery time. You can see that there is no.

That is, the energy recovery circuit is not driven as many as the preset number of sustain pulses applied to the sustain period of the first subfield, so that the sustain electrode without energy supply time and recovery time is supplied to the sustain electrode, and the remaining sustain period and During the sustain period of the remaining subfields, an energy recovery circuit is driven to supply a sustain pulse having an energy supply time t3 and a recovery time t4.

This driving method does not drive the energy recovery circuit so that only the initial set number of sustain pulses have no energy supply time and recovery time in one frame, but drives the energy recovery circuit from subsequent sustain pulses to achieve initial high brightness. Therefore, power consumption can be reduced through stable energy recovery operation.

Although not shown, a sustain pulse having no energy supply time and a recovery time is applied to prevent the energy recovery circuit from being driven in the odd subfields of the subfields constituting the frame, and the energy recovery circuit is applied in the even subfields. Drive to apply a sustain pulse having an energy supply time and a recovery time. Of course, the waveforms applied to the odd-numbered subfields and the even-numbered subfields may be reversed to the above cases.

In addition, one or more of the above-described methods may be mixed and used. For example, a subfield may be divided into a first part, a middle part, and a second part, and an energy recovery circuit may be driven only in the first part and the second part, and the first subfield may be used. Only the set number of sustain pulses can be configured not to drive the energy recovery circuit.

In addition, it is possible to determine the size of the load on the panel and to use one or more of the above methods according to the load size. The technical matters can be determined and the known matters can be known to those skilled in the art.

In the detailed description of the present invention, the present invention has been described with or without driving of the energy recovery circuit. However, the present invention is not limited thereto, and the energy recovery circuit is driven so that the energy supply time and recovery time are controlled differently according to the position or order of the sustain pulses applied to the sustain electrode. However, it should be recognized that initial high brightness and luminance adjustments are possible.

As described in detail above, the present invention can be performed by not driving the energy recovery circuit at a predetermined position or order of the sustain pulses applied to the sustain electrode or controlling the rising time (energy supply time) and polling time (energy recovery time). High brightness and brightness can be adjusted.

Claims (8)

The operation of the energy recovery circuit differs depending on the position at which the sustain pulse is applied when driving the panel. The energy recovery circuit, A method for driving an energy recovery circuit of a plasma display panel, characterized in that it is driven differently in odd and even subfields. delete The method of driving an energy recovery circuit of a plasma display panel according to claim 1, wherein the energy recovery circuit in the odd subfield is driven, and the energy recovery circuit in the even subfield is not driven or vice versa. . The operation of the energy recovery circuit differs depending on the position at which the sustain pulse is applied when driving the panel. The energy recovery circuit, And when the subfield is divided into a first half, a middle half, and a second half, the first half and the second half are operated in the same manner, and the first half and the middle half are driven differently. 5. The method of driving an energy recovery circuit of a plasma display panel according to claim 4, wherein the energy recovery circuit of the middle part is driven and not driven in the first part and the second part or vice versa. The operation of the energy recovery circuit differs depending on the position at which the sustain pulse is applied when driving the panel. The energy recovery circuit, If the subfield is divided into the first half and the second half, the first half subfield and the second half subfield are driven differently. 7. The method of driving an energy recovery circuit of a plasma display panel according to claim 6, wherein the energy recovery circuit in the first half subfield is driven, and the energy recovery circuit in the second half subfield is not driven or vice versa. . The operation of the energy recovery circuit differs depending on the position at which the sustain pulse is applied when driving the panel. The energy recovery circuit, The energy recovery circuit driving method of the plasma display panel, characterized in that the driving is not driven during the initial number of sustain pulses of the first sub-field.

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