KR100213277B1 - Horizontal line scanning method in the plasma display device - Google Patents

Abstract

SUMMARY OF THE INVENTION The present invention provides a horizontal line scanning method that can further secure a sustain period in driving a PDP display device. The horizontal line scanning method according to the present invention provides a predetermined sub-area for an applied image signal. In a PD display apparatus driven by dividing a wall charge generation step, a scan step, and a sustain step by a field unit, the wall charges of the horizontal lines in which the sustain step is performed simultaneously among the horizontal lines constituting the subfield are simultaneously generated, and then scanned. Steps are sequentially performed on the horizontal lines in which the wall charges are generated in a predetermined order, and when the scanning of all the horizontal lines in which the wall charges are generated is completed, the process proceeds to the sustain step. Accordingly, a sustain period can be secured more than that of wall charges generated by each horizontal line unit, thereby providing a PDP display device capable of making the brightness of image data brighter.

Description

Horizontal Line Scanning Method of PD Display

1 is a schematic block diagram of hardware for performing a horizontal line scanning method of a PDP display device according to the present invention.

2 is a view for explaining an embodiment of a horizontal line scanning method according to the present invention.

3 is an electrode structure diagram of a PDP when scanning a horizontal line as shown in FIG.

4 is a pulse waveform diagram of a control signal generated from the control signal generator shown in FIG. 1 to scan a horizontal line as shown in FIG.

5 is a view for explaining another embodiment of the horizontal line scanning method according to the present invention.

6 is an electrode structure diagram of a PDP when scanning horizontal lines as shown in FIG.

FIG. 7 is a pulse waveform diagram of a control signal generated from the control signal generator shown in FIG. 1 so as to scan a horizontal line as shown in FIG.

8 is a diagram for explaining a horizontal line scanning process for one subfield according to a conventional method.

* Explanation of symbols for main parts of the drawings

110: ADC 120: memory

130: data processing unit 135: synchronization separation unit

140: control signal generator 150: sustain unit

160: scan and sustain unit 170: addressing unit

180: PDP

The present invention relates to a horizontal line scanning method of a plasma display panel (hereinafter, referred to as a PDP) display device, and more particularly, to ensure sufficient sustain time of a sub-field. The present invention relates to a horizontal line scanning method of a PDP display device.

Among various display devices that are applied to various fields, cathode ray tubes (abbreviated as CRTs), which have a clear display, colorization, simple operation, and low manufacturing cost, are used in many fields. Since the CRT itself has a structure of a Frasco type, it is large in size, requires a high operating voltage of approximately 10,000V, and has a big disadvantage of display distortion.

Therefore, there is a strong demand for the emergence of a display device that can replace the above CRT, and research on a so-called flat display device having a large display area and a small volume has been continuously conducted in many fields related thereto.

Such flat display devices include active devices such as electro luminescence, light emitting diodes, and PDPs, liquid crystal displays, and electro chromic displays. There is a passive device, and the present invention relates to a display device using a PDP which is substantially one of the active devices.

Advantages of the above-described PDP display device include a memory function for sustaining discharge when a write pulse is input once, and a display point is defined in a matrix structure, so that there is no distortion of the image and flickers because the emission frequency is high at 50 to 100 kHz. There is no tingling. In addition, since the PDP has a planar structure, it is advantageous for miniaturization, and since the material that reduces the extinguishing due to discharge is used on the surface of the dielectric layer in contact with the discharge, the life is long, and the panel structure mainly composed of the glass plate projects semi-fixed information as a slide It is possible to superimpose on a slide, which is advantageous for simplicity.

The conventional typical method of scanning horizontal lines on one subfield in such a PDP display is as shown in FIG. That is, after generating and scanning the wall charges in units of each horizontal line (L1, L2, L3, ... L _M ), when the scanning of all the horizontal lines of the corresponding subfield is completed, in the section T, Sustain is performed for all unit cells existing in the corresponding subfield.

In more detail with reference to FIG. 8, the wall charges are generated for the horizontal line L1 on the subfield in the section V1 shown in FIG. 8, and then the horizontal line L1 is scanned in the section S1, and the horizontal line in the section V2. Create wall charges for L2 and then scan horizontal line L2 in section S2, generate wall charges for horizontal line L3 in section V3, and scan horizontal line L3 in section S3 and scan for horizontal line L _M. When the scan is performed in the S _M section, sustain is performed on all unit cells existing in the corresponding subfield in the T section. In this case, scan means light emitting by selecting a unit cell to emit light from among unit cells on each horizontal line of the PDP display device, and sustain means light emission of all cells of the PDP display device. Means that.

Thus, since the conventional horizontal line scanning method generates wall charges for each horizontal line and then scans each horizontal line, it takes a lot of time to generate and scan wall charges, and thus the sustain processing time is allocated relatively short. There is a disadvantage in that the brightness of the PDP display device cannot be sufficiently brightened.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned disadvantages. In the PDP display device implemented to display image data in a sequential scanning method, wall charges are simultaneously generated for each horizontal line constituting one subfield. It is an object of the present invention to provide a horizontal line scanning method of a PDP display device that can further secure sustain processing time by sequentially scanning the same.

Another object of the present invention is to sequentially generate the wall charges by dividing each horizontal line constituting one subfield by odd number lines and even lines in a PD display device implemented to display image data by interlaced scanning method. The present invention provides a method for scanning a horizontal line of a PD display device that can secure a sustain processing time by scanning.

In order to achieve the above objects, the horizontal line scanning method according to the present invention divides an applied image signal into subfields based on weights, and performs an image charge generation step, a scan step, and a sustain step in units of subfields. In a PD display apparatus driven to display a signal on a plasma display panel (PDP), a wall charge of horizontal lines in which the sustain step is performed simultaneously among the horizontal lines existing on the subfield is simultaneously generated, and then proceeds to the scanning step. And sequentially scan the horizontal lines in which the wall charges are generated in a predetermined order, and when the scanning of all the horizontal lines in which the wall charges have been generated is completed, the process proceeds to the sustain step.

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

FIG. 1 is a schematic block diagram of hardware for performing a horizontal line scanning method of a PDP display device according to the present invention. The ADC (Analog To Digital Converter; hereinafter abbreviated as ADC 110), memory 120, and data processor 130, the synchronization separator 135, the control signal generator 140, the sustain 150, the scan and sustain unit 160, the addressing unit 170, and the PDP 180.

In the same figure, the ADC 110 converts analog image data into digital image data, and the memory 120 stores image data converted to digital through the ADC 110. When the data processing unit 130 displays the progressive scan method on the PDP 180, the data processor 130 converts the interlaced scan digital image data stored in the memory 120 into the progressive scan digital image data and has the same weight. The image data having the weight is collected and reconstructed into one subfield and then provided to the addressing unit 170, and stored in the memory 120 when the interpolation is displayed on the PDP 180. The digital image data having the same weight is extracted and reconstructed into one subfield and then provided to the addressing unit 170.

Meanwhile, the sync separator 135 separates a vertical sync signal (hereinafter, referred to as Vsync) from the image data and provides the control signal generator 140 to the control signal generator 140. The Vsync provided from the unit 135 generates a control signal (or pulse) for generating wall charge, a control signal for scanning, a control signal for sustaining, and a control signal for addressing, respectively. At this time, the control signal generator 140 alternately generates a control signal for sustain to the sustain unit 150 and the scan and sustain unit 160.

The sustain unit 150 generates wall charges on each horizontal line constituting the subfield based on the control signal for generating wall charges provided from the control signal generator 140, and simultaneously generates the wall charges from the control signal generator 140. A high voltage, for example 180V to 340V, is applied to the sustain electrode of the PDP 180 based on the provided control signal for sustain.

The scan and sustain unit 160 applies a high voltage to the scan and sustain electrodes of the PDP 180 based on a control signal for scanning provided from the control signal generator 140, and at the same time, the control signal generator 140. The high voltage is applied to the scan and sustain electrodes of the PDP 180 based on the control signal for sustain provided from the PDP 180.

The addressing unit 170 addresses the unit cells selected in the horizontal line according to the image data provided from the data processing unit 130 based on the control signal for addressing provided from the control signal generator 140, and the PDP 180. Is composed of M x N unit cells, each unit cell is composed of a sustain electrode (X electrode), a scan and sustain electrode (Y electrode), and an addressing electrode (Z electrode).

2 is a view for explaining an embodiment of a horizontal line scanning method of a PDP display apparatus according to the present invention through the hardware consisting of the above-described components, and FIG. 3 is a horizontal line as shown in FIG. Is a structure diagram of an electrode on the PDP 180, and FIG. 4 is a pulse of a control signal generated from the control signal generator 140 shown in FIG. 1 when scanning a horizontal line as shown in FIG. It is a waveform diagram. Referring to FIGS. 1 to 4, the operation of an embodiment according to the present invention will be described.

First, when analog image data is converted into digital image data through the ADC 110 and stored in the memory 120, the data processor 130 sequentially scans the interlaced digital image data stored in the memory 120. The subfields are reconstructed by the image data having the same weight and transmitted to the addressing unit 170 while being processed to be converted into the digital image data of the scheme.

On the other hand, when the Vsync included in the analog image data is separated from the synchronization separator 135 and provided to the control signal generator 140, the control signal generator 140 may generate a timing pulse as shown in FIG. 4A. The control signal for generating wall charges and sustaining is provided to the sustaining unit 150, and the control signal for scanning and sustaining having M timing pulses as shown in FIG. 4B is sent to the scanning and sustaining unit 160. A control signal for data addressing having a timing pulse as shown in FIG. 4C is provided to the addressing unit 170.

Accordingly, the sustain unit 150 configures all of the subfields shown in FIG. 2 during the T1 section (the section consistent with the V section shown in FIG. 2) of the timing pulses provided from the control signal generator 140. A high voltage is provided to the X electrode (sustain electrode) of the PDP 180 shown in FIG. 3 so that wall charges for the horizontal lines (L ₁ to L _M ) are simultaneously generated.

Then, the scan and sustain unit 160 receives one sub shown in FIG. 2 during the T2 section (S section in FIG. 2) shown in FIG. 4B by the control signal provided from the control signal generator 140. FIG. Corresponding voltage pulses are provided to the Y ₁ to Y _M electrodes of the PDP 180 shown in FIG. 3 so as to sequentially scan the horizontal lines constituting the field. That is, after providing a voltage pulse shown in Figure 4b, each with Y ₁ ~Y _M electrodes on the PDP (180) to scan a horizontal line L ₁ of the sub-fields shown in FIG. 2, L _2, L _3, ..., L _M Scan in horizontal line order.

During the above-described T2 section, the addressing unit 170 sends data from the control signal generating unit 170 to the timing pulse of the control signal provided as shown in FIG. 4C on the Z ₁ to Z on the PDP 180 shown in FIG. _i electrodes are provided respectively.

Then, the sustain unit 150 is based on the timing pulse of the control signal alternately provided to the sustain unit 150 and the scan and sustain unit 160 during the T3 section of FIG. 4 for the sustain from the control signal generator 140. ) And the scan and sustain unit 160 are simultaneously sustained for all horizontal lines L _{1 to} L _M present in one subfield shown in FIG. 2 (T section in FIG. 2). As shown in FIG. 2, the wall charge generation step, the scan step, and the sustain step are performed in the same manner as described above.

FIG. 5 is a view for explaining another embodiment of the horizontal line scanning method according to the present invention, which is an example applied when the display method on the PDP 180 is an interlaced scanning method, and FIG. 6 is shown in FIG. As shown in FIG. 5, the electrode structure diagram of the PDP 180 is scanned when the horizontal line is scanned, and FIG. 7 is the control signal generator 140 shown in FIG. 1 so as to scan the horizontal line as shown in FIG. This is a pulse waveform diagram of the generated control signal.

Next, an operation of another embodiment of the present invention will be described with reference to FIGS. 1 and 5 to 7.

First, the X1 electrode among the electrodes provided on the PDP 180 shown in FIG. 6 is an electrode for generating wall charges and sustaining the horizontal lines of the radix of the horizontal lines constituting the subfield, and the X2 electrode is the same sub Among the horizontal lines constituting the field, electrodes for wall charge generation and sustain for the even horizontal lines, Y _{1 to} Y _N are electrodes for scan and sustain, and Z ₁ , Z ₂ , ... are addressing data. It is an electrode for.

As described above, in the state in which the electrode of the PDP 180 is formed, the data processor 130 reads image signals stored in the memory 120 in an interlaced manner, collects image data having the same weight, and reconstructs a subfield. When a single subfield is transmitted to the addressing unit 170, the control signal generator 140 controls the control signal having a waveform diagram as shown in FIG. 7 based on Vsync provided from the synchronization separating unit 135. Occurs each.

That is, when the control signal for the wall charge generation and sustain shown in FIG. 7a and b is transmitted from the control signal generator 140 to the sustain unit 150, the sustain unit 150 has a cycle as shown in FIG. A control signal is provided to the X1 electrode shown in FIG. 6, and a control signal having a period as shown in FIG. 7B is provided to the X2 electrode shown in FIG.

Accordingly, the horizontal lines (L ₁ , L ₃ ) of all the horizontal lines (L ₁ to L _N ) constituting the subfields shown in FIG. 5 during the T4 section in FIG. 7 (corresponding to the V1 section in FIG. 5). , L ₅ , ..., L _N-1 ), wall charges are generated simultaneously. As shown in FIG. 6, it is commonly connected to the above-described horizontal lines of all the odd numbers, and sustains a pulse having a high voltage in the above-mentioned T4 section (Fig. 7a) by the X1 electrode (sustain electrode) on the PDP 180. By providing through section 150.

Then, the scan and sustain unit 160 transmits a control signal having a waveform diagram like that of FIG. 7c provided from the control signal generator 140 during the T5 section (S1 section in FIG. 5) shown in FIG. On the horizontal lines of the radix out of the horizontal lines constituting one subfield shown in FIG. 5 by providing the Y ₁ , Y ₃ , ..., Y _N-1 electrodes of the PDP 180 shown in FIG. Scan sequentially. That is, after scanning the L ₁ horizontal line with respect to the subfield shown in FIG. 5, the L ₃ horizontal line is scanned and L ₅ ,..., L _N-1 horizontal line in order.

During the above-described T5 section, the addressing unit 170 outputs data corresponding to the odd horizontal line of the subfield based on the timing pulse of the control signal provided from the control signal generating unit 140 as shown in FIG. 7E. Transfer to the Z electrodes on the PDP 180, respectively.

Then, the sustain unit 150 is based on the timing pulse of the control signal alternately provided to the sustain unit 150 and the scan and sustain unit 160 during the T6 section of FIG. 7 for the sustain from the control signal generator 140. ) And the scan and sustain unit 160 sustain the horizontal lines of all the radix present in one subfield shown in FIG. 5 simultaneously (T1 section in FIG. 5). At this time, as can be seen by the timing pulse shown in Fig. 7B, the amount of light discharged during sustain for the odd horizontal lines is increased based on the voltage pulse applied to the X2 electrode.

Then, in order to display the data corresponding to the even horizontal line of the same subfield on the PDP 180, when the timing pulse is provided to the sustain unit 150 as shown in FIG. 7B, the sustain unit 150 is connected to the T7 section. A high voltage is generated to the X2 electrode on the PDP 180 which is commonly connected to the even horizontal line of the even field of the subfield, thereby simultaneously generating wall charges for all the even horizontal lines of the subfield (V2 section in FIG. 5).

Then, the scanning and sustaining unit 160 is operated during the T8 section (S2 section in FIG. 5) shown in FIG. 7 by the control signal having the waveform diagram as shown in FIG. 7D provided from the control signal generator 140. FIG. The horizontal lines of even lines among the horizontal lines constituting one subfield shown in FIG. 5 are sequentially scanned. That is, the pulses shown in FIG. 7d are provided to the Y ₂ , Y ₄ , ..., Y _N electrodes of the PDP 180 shown in FIG. 6 to scan the L ₂ horizontal lines, and then L ₄ , L ₆ , ..., L _N Scan in horizontal line order.

During the above-described T8 section, the addressing unit 170 shows data corresponding to the even horizontal line of the excellent subfield in FIG. 6 based on the timing pulse of the control signal provided from the control signal generating unit 140 as shown in FIG. 7E. To each of the Z electrodes on the PDP 180.

Then, the sustain unit 150 is based on the timing pulse of the control signal alternately provided to the sustain unit 150 and the scan and sustain unit 160 during the T9 section of FIG. 7 for the sustain from the control signal generator 140. ) And the scan and sustain unit 160 simultaneously sustain the horizontal lines of all the radix present in the one subfield shown in FIG. 5 (T2 section in FIG. 5). At this time, as shown by the timing pulse shown in Fig. 7A, the amount of light discharged at the time of sustaining the even horizontal line is increased based on the voltage pulse applied to the X1 electrode.

As described above, the present invention controls the wall charges of the horizontal lines sustained simultaneously among the horizontal lines constituting the subfield to be generated at the same time, thereby reducing the wall charge generation time and increasing the sustain time, thereby being displayed on the PDP. There is an effect that can display the image data brighter.

Claims (1)

The image signal is divided into subfields based on weights, and a wall charge generation step, a scan step, and a sustain step are performed to display the image signal on a plasma display panel (PDP). In the PD display apparatus, the wall charges of the horizontal lines in which the sustain step is performed simultaneously among the horizontal lines existing on the subfield are generated at the same time, and then the scanning is performed to the horizontal lines in which the wall charges are generated. The horizontal line of the PDP display device, wherein the scan process is sequentially performed in a predetermined order, and when the scan of all the horizontal lines in which the wall charges are generated is completed, the process proceeds to the sustain step. Scan method.