KR100285763B1 - DC plasma display panel and its driving method - Google Patents

Abstract

The present invention relates to a direct current plasma display panel having a simple structure and suitable for high brightness, and a driving method thereof.

The DC-type PDP according to the present invention includes a plurality of anode lines formed on the first substrate, a plurality of cathode lines formed on the second substrate in a direction orthogonal to the anode lines, and an auxiliary cathode line formed parallel to the cathode line between the cathode lines. It consists of a matrix electrode structure consisting of a plurality of discharge cells consisting of a discharge space provided by a partition formed between the first substrate and the second substrate, so as to cause a pre-discharge between the cathode line and the auxiliary cathode line formed on both sides thereof. The cathode line and the auxiliary cathode line may be disposed to be shared with neighboring discharge cells.

According to the present invention, since a separate auxiliary discharge cell is not required, the structure and driving method are simpler than in the related art, and the number of discharge cells per unit area is reduced, thereby increasing the area of the discharge cells, thereby improving discharge efficiency.

Description

DC plasma display panel and its driving method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device, and more particularly, to a direct current type plasma display panel suitable for high brightness and simple structure, and a driving method thereof.

In general, a plasma display panel (hereinafter referred to as PDP) is a display device that uses gas discharge, and is formed using text or graphics by using visible light generated by vacuum ultraviolet rays generated during gas discharge by exciting phosphors. Will be displayed. Such PDPs are roughly classified into a DC type and an AC type according to the electrode structure. In the case of a direct current type PDP, the electrode is directly exposed to the discharge gas. In the case of an alternating current type PDP, the electrode is indirectly exposed through the dielectric.

Referring to FIG. 1, a cell structure of a direct current type PDP corresponding to one pixel is shown.

The cell shown in FIG. 1 corresponds to one pixel, and is generally composed of four types of display cells and two types of auxiliary discharge cells provided at both sides of the display cells. A cathode 12 is disposed on the upper substrate 10, and an anode 18, an auxiliary anode 20, an anode bus electrode 22, and an auxiliary anode bus line 21 are disposed on the lower substrate 14. It is becoming. In addition, a current limiting resistor 24 is disposed between the anode bus line 22 and the anode 18, the auxiliary cathode bus line 21, and the auxiliary anode 20 to constrain the discharge current and sputter the cathode 12. To significantly increase the lifespan. The insulating layer 26 is formed on the lower substrate 14 on which the electrodes are disposed. The partition wall 16 extending upward from the lower substrate 14 is formed in a lattice structure to provide four display cells and auxiliary discharge cells on both sides of the display cells. The anode 18 arranged in the display cell and the auxiliary anode 20 arranged in the auxiliary discharge cell have a structure protruding from each discharge space. Then, by applying the phosphor 28 around the anode 18 of the four display cells and on the surface of the partition wall, the pixel is composed of RGBG, unlike ordinary RGB.

Referring to FIG. 2, a cross-sectional view of adjacent display cells with an auxiliary discharge cell therebetween is shown.

In FIG. 2, a priming discharge occurs due to a voltage applied between the auxiliary anode 20 and the cathode 12 in the auxiliary discharge cell, and a priming space provided on the partition wall 16 of the charged particles generated by the priming discharge. Through the movement to the discharge space of the adjacent display cells. In this way, a light discharge occurs in the display cell due to the charged particles moved to the discharge space of the display cells and the voltage applied between the negative electrode 12 and the positive electrode 18, and the discharge is maintained by the sustain pulse applied to the negative electrode 12. Done.

3 shows an overall electrode arrangement diagram of the direct current type PDP.

The DC-type PDP shown in FIG. 3 has cathode lines C0, C1, C2, ... arranged in parallel in the horizontal direction, auxiliary anode bus lines A0, A1, ..., and auxiliary anodes arranged in parallel in the vertical direction. The anode bus lines D1, D2, ... are arranged two by one between the bus lines A0, A1, .... Then, the auxiliary discharge cell 13 is provided at the intersection of the cathode lines C0, C1, C2, ... and the auxiliary anode bus lines A0, A1 ..., and the cathode lines C0, C1, C2, ... The display cell 11 is provided at the intersection of the anode bus lines D1, D2,...

The direct current type PDP having such a structure is called a pulse memory driving method, and an example of its basic driving waveform is shown in FIG.

Auxiliary pulses for priming discharge are constantly supplied to the auxiliary anode bus lines A0, A1,... The priming discharge is generated by the scanning pulses sequentially supplied to the auxiliary pulses and the cathode lines C0, C1, C2,... At this time, light pulses corresponding to the video data pulses supplied to the anode bus lines D1, D2, ... are supplied in synchronization with the scan pulses, thereby selectively writing discharges in units of scan lines. Subsequently, the discharge cells in which the writing discharge is generated are discharged by the sustain pulse supplied to the positive bus lines D1, D2,... And the bias voltage applied to the negative line C0, C1, C2,... Will be maintained. This discharge sustain period is determined by the length of the bias voltage applied to the cathode lines C0, C1, C2, .... In this manner, the DC-type PDP loads data in line order and simultaneously applies a sustain pulse voltage.

However, such an AC-type PDP is complicated in structure because four display cells per pixel must be provided in order to use the priming discharge by the auxiliary discharge cell. In addition, as the number of discharge cells per unit area is larger than that of the AC-type PDP, there is a problem in that discharge efficiency is not good because the area of the cells is relatively small.

Accordingly, an object of the present invention is to provide a direct current type PDP and its driving method which can simplify the structure and increase the discharge efficiency by expanding the unit area of the cell.

1 is a perspective view showing a cell structure of a direct current type PDP corresponding to one pixel.

2 is a cross-sectional view showing adjacent display cells with an auxiliary discharge cell interposed in a conventional direct current type PDP.

3 is an overall electrode arrangement diagram of a conventional direct current type PDP.

4 is a drive waveform diagram for explaining a conventional DC-type PDP driving method.

5 is a cross-sectional view of a direct current type PDP according to an embodiment of the present invention.

6 is an overall electrode layout of a direct current type PDP according to an embodiment of the present invention.

7 is a drive waveform diagram for explaining a DC-type PDP driving method according to an embodiment of the present invention.

8 is a diagram for explaining a gray scale expression method in a conventional direct current type PDP.

* Explanation of symbols for main parts of the drawings

10, 30: upper substrate 12, 38: cathode

14, 34: lower substrate 16, 36: partition wall

18, 32: anode 20, 40: auxiliary anode

21: Auxiliary Anode Bus Line 22: Anode Anode Bus Line

24: resistance 26: insulating layer

28: phosphor 44: discharge cell

In order to achieve the above objects, the DC-type PDP according to the present invention includes a plurality of anode lines formed on the first substrate, a plurality of cathode lines formed on the second substrate in a direction orthogonal to the anode line, and a cathode between the cathode lines. It consists of a matrix electrode structure consisting of an auxiliary cathode line formed parallel to the line, and a plurality of discharge cells consisting of a discharge space provided by a partition wall formed between the first substrate and the second substrate, the cathode line and the auxiliary cathode line formed on both sides The negative electrode line and the auxiliary negative electrode line are disposed to be shared with neighboring discharge cells so as to cause preliminary discharges therebetween.

In the DC-type PDP driving method according to the present invention, n × provided at a point where m anode lines intersect between n / 2 + 1 cathode lines and n / 2 auxiliary cathode lines disposed between the cathode lines. A method of driving a direct current plasma display panel having m discharge cells in an address step for sequentially writing data and a discharge sustain step for generating sustain discharge in accordance with the written data, wherein the address step is an i-th step; Supply the first scan pulse to the cathode line to generate a priming discharge between the i-1th auxiliary cathode lines, and then supply the corresponding video data pulses to the m anode lines to supply the voltage difference between the first scan pulse and the data pulse. According to the step of causing the selective discharge discharge, and supplying the second scan pulse to the i-th negative line by the priming discharge between the i + 1st auxiliary negative line After be generated characterized in that it comprises the step of the selective writing discharge is generated in accordance with the voltage difference between the second scan pulse and the data pulse is supplied to the video data pulses to the m number of cathode lines.

Other objects and advantages of the present invention in addition to the above object will become apparent from the description of the preferred embodiment of the present invention with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 5 to 8.

5 is a cross-sectional view of a direct current type PDP according to the present invention, in which the PDP shown in FIG. 5 alternates with the anode 32 disposed on the upper substrate 30 and the lower substrate 34 alternately. And a partition wall 36 formed between the upper electrode 30 and the lower electrode 34 and the upper substrate 30 and the lower substrate 34 to provide the display discharge space 42.

The PDP shown in FIG. 5 does not have a separate auxiliary discharge cell unlike the conventional PDP. The upper substrate 30 and the lower substrate 34 are disposed to face each other. The anode 32 is disposed side by side on the upper substrate 30, and the cathode 38 and the auxiliary cathode 40 are disposed side by side in a direction crossing the anode 32 on the lower substrate 34. The partition wall 36 formed on the cathode 38 and the auxiliary cathode 40 alternately disposed on the lower substrate 34 provides a discharge space 42 to block optical interference between the cells and the upper substrate ( 30) and the lower substrate 34 serves to support. And, it can be formed with an insulating layer (not shown) on the lower substrate 34 on which the cathode 38 and the auxiliary cathode 40 are disposed, to generate visible light having a unique color on the surface of the insulating layer and the partition 36. Phosphor (not shown) is applied.

As described above, since the DC-type PDP of the present invention does not have a separate auxiliary discharge cell, there is an advantage that the structure is relatively simple as compared with the related art. Therefore, the number of discharge cells provided per unit area is reduced, so that the area of the discharge cells is relatively increased, thereby increasing the discharge area, thereby improving discharge efficiency.

Referring to FIG. 6, the overall electrode arrangement of a direct current type PDP according to an embodiment of the present invention is shown.

The PDP shown in FIG. 6 has anode lines D1, D1, D2, D3, ... arranged side by side in the vertical direction, and cathode lines C0, C1, C2, C3, ... arranged alternately in the horizontal direction. ) And auxiliary cathode lines A0, A1, A2, A3,... In such a PDP, the discharge cells 44 are formed of the cathode lines C0, C1, C2, C3... And the anode lines A0, A1, A2 on which the anode lines D0, D1, D2, D3,... , A3, ...). In this case, except for the first and the last cathode line (C0, Ci), the cathode line (C) and the auxiliary cathode line (A) is located between the adjacent discharge space is commonly used in two adjacent discharge cells. Accordingly, in the conventional PDP, n cathode lines are required to provide n × m discharge cells, but only n / 2 + 1 cathode lines are required in the PDP of the present invention. Here, anode lines D0, D1, D2, D3, ... are used to input video data, cathode lines C0, C1, C2, C3, ... are used to scan a screen and maintain discharge, The auxiliary cathode lines A0, A1, A2, A3, ... are used to cause the priming discharge.

FIG. 7 illustrates driving waveforms for explaining a DC-type PDP driving method according to an exemplary embodiment of the present invention.

First, as the scanning pulse having a negative voltage value is supplied to the third cathode line C2 of the PDP shown in FIG. 6 and the second auxiliary cathode line A1 becomes the base potential, two electrode lines C2 and A1 are provided. The priming discharge occurs in the discharge cells of the fourth scan line due to the voltage difference generated between them. At this time, since the negative voltage pulse is supplied to the third auxiliary cathode line A2 disposed adjacent to the third cathode line C2 downward, there is almost no potential difference between the two electrode lines, and thus no discharge occurs. After the priming discharge is generated, video data is loaded on the anode lines D0, D1, D2, D3, ... to select the discharge cell of the fourth scan line. In this case, in order to use the priming charged particles generated by the priming discharge, the priming discharge between the third cathode line C2 and the second auxiliary cathode line A1 may include the third cathode line C2 and the anode lines D0,. It is preferable to occur earlier by the Tr period than the writing discharge between D1, D2, D3, ...). Then, as the same scanning pulse is supplied to the third cathode line C2 and the third auxiliary cathode line A2 becomes the base potential, the fifth scan line is divided by the voltage difference between the two electrodes C2 and A2. Priming discharge occurs in the discharge cells. At this time, a negative voltage pulse is supplied to the second auxiliary cathode line A1 adjacent to the third cathode line C2 to prevent discharge. Subsequently, video data is loaded on the anode lines D0, D1, D2, D3, ..., so that the fifth scan line is selected of the discharge cell. Subsequently, the next scan lines are sequentially scanned in the same manner as above. The two scanning lines loaded with data maintain a discharge by a sustain pulse (not shown) supplied to the anode lines D0, D1, D2, D3, ... for each data signal. After the discharge, the discharge is stopped by the applied erase voltage.

Referring to FIG. 8, a gray scale implementation method of the direct current type PDP is shown in chronological order.

The DC-type PDP adopts a method of dividing one frame and giving a gradation by combining the number of subfields as in the normal AC method. In other words, time division is performed by dividing one frame into the same number of sub-fields as the number of bits, and the sustain discharge period is adjusted differently for each subfield to determine a gray value proportional to the sustain discharge period. By combining them, the gradation of one frame is realized. At this time, the AC PDP maintains the discharge at the same time after scanning the screen, while the DC PDP scans in the linear sequence and then starts the sustain discharge in the linear sequence for a predetermined time and then erases the discharge in the linear sequence. .

As described above, according to the DC-type PDP and the driving method thereof according to the present invention, since the auxiliary discharge cells are not required, the structure and the driving method are simpler than in the related art. In addition, according to the DC-type PDP and the driving method thereof according to the present invention, the number of discharge cells per unit area is reduced, so that the area of the discharge cells is relatively increased, thereby improving the discharge efficiency.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (6)

Matrix electrode structure comprising a plurality of anode lines formed on the first substrate, a plurality of cathode lines formed on the second substrate in a direction orthogonal to the anode line, and an auxiliary cathode line formed parallel to the cathode line between the cathode lines And a plurality of discharge cells formed of discharge spaces formed by partition walls formed between the first substrate and the second substrate, wherein the auxiliary discharge is caused to cause a preliminary discharge between the cathode line and the auxiliary cathode line formed at both sides thereof. A cathode of the direct current type plasma display panel, characterized in that disposed adjacent to the discharge cell. The direct current plasma display panel of claim 1, further comprising a phosphor coated on at least one of the first and second substrate partition walls to be exposed to the discharge space. The direct current type plasma display panel of claim 1, wherein the barrier rib is formed in a lattice shape, and the cathode line and the auxiliary cathode line are positioned under the barrier wall. The direct current type according to claim 1, further comprising m anode lines, n / 2 + 1 cathode lines, and n / 2 auxiliary cathode lines to provide n × m discharge cells. Plasma display panel. A direct current type having n × m discharge cells provided at an intersection point of m anode lines between n / 2 + 1 cathode lines and n / 2 auxiliary cathode lines disposed between the cathode lines. A method of driving a plasma display panel in an address step for writing data in line order and a discharge holding step for generating sustain discharge in accordance with the written data, wherein the address step supplies a first scan pulse to the i-th cathode line. After the priming discharge is generated between the i-1 th auxiliary cathode line, the video data pulses are supplied to the m anode lines to selectively write the discharge according to the voltage difference between the first scan pulse and the data pulse. Is generated, and a second injection pulse is supplied to the i th cathode line to generate a priming discharge between the i + 1 th auxiliary cathode lines. And supplying corresponding video data pulses to the m anode lines to selectively generate a discharge discharge according to the voltage difference between the second scan pulse and the data pulses. Driving method. The voltage supply pulse of the same polarity as the scan pulse is supplied to the i + 1 th auxiliary cathode line to prevent discharge of the i th cathode line while the first scan pulse is applied. DC-type plasma, characterized in that while the second scan pulse is applied, a voltage pulse of the same polarity as the scan pulse is supplied to the i-1 th auxiliary cathode line to prevent discharge from the i-th cathode line. How to drive the display panel.