KR20020061391A - Plasma display panel - Google Patents

Abstract

PURPOSE: A plasma display panel is provided to reduce height of barrier ribs, readily manufacture, and minimize loss of visible ray. CONSTITUTION: A plasma display panel comprises a top substrate(21), a bottom substrate(30), a data electrode(29), a scan and RF electrode(27), and an RF sustain electrode(26). The data electrode(29) is used for selectively writing and deleting in unit of cell. The scan and RF electrode(27) formed on the data electrode(29) is used for addressing with the data electrode(29) and acts as a ground electrode of an RF signal during sustain discharge. The RF sustain electrode(26) is isolated from the scan and RF electrode(27) by a dielectric layer(28) and is used for sustaining RF discharge. A cell selected in addressing supplies a seed charge for generating RF plasma with a triggering voltage applied between the data electrode(29) and the scan and RF electrode(27).

Description

Plasma Display Panel

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel using a high frequency voltage.

Recently, with the increasing demand for multimedia displays, the development of plasma display panels (PDPs), which are promising for home use due to its advantages in large screens and viewing angles and favorable prices, has been rapidly made. Research on increasing luminance and discharge efficiency has been actively conducted. The PDP generally uses a gas discharge phenomenon to display an image using visible light generated by vacuum ultraviolet rays generated during gas discharge to emit phosphors.

In the case of sustain discharge using a high frequency (1 to 100 MHz) instead of AC (hundreds of kHz), it can bring about a significant improvement in efficiency in terms of high brightness at low power as compared to the case of using AC.

1 is a view showing a general structure of a conventional matrix PDP.

The conventional PDP is composed of a top plate and a bottom plate. The top plate structure is simpler than that of the general PDP. It consists of a high frequency sustain electrode (2) for high frequency sustain discharge and a dielectric layer (3) for isolation and protection of plasma on the upper substrate (1).

In contrast, the lower plate is more complicated in structure than the upper plate. A data electrode 10 for selective writing and erasing in units of cells is formed on the lower substrate 11, and a first dielectric layer 9 for isolation is applied on the data electrode 10. On the first dielectric layer 9, a high frequency electrode 8, which is used for addressing together with the data electrode 10 and used as a ground electrode of a high frequency signal during sustain discharge, is formed to be orthogonal to the data electrode 10. The second dielectric layer 7 is formed for isolation from the plasma and the wall charge effect. Finally, the protective layer 6 is formed for the purpose of lowering the voltage in the selective writing due to the dielectric layer protection and the high secondary electron emission coefficient. .

In order to turn ON or OFF only the cells selected at the time of discharge, the plasma must be limited, thereby forming the partition 4.

In general AC PDP, there is no difficulty in isolating plasma because it uses surface discharge (maintains voltage discharge on two electrodes on one side) during sustain discharge.However, in case of PDP using high frequency, counter discharge (upper / lower It is difficult to isolate the discharge due to the use of maintaining the discharge between the electrodes, and thus has a well-shaped partition wall structure of the Chinese character. The phosphor is applied in consideration of the transmission of visible light generated through the upper plate without disturbing the discharge generated in the lower plate upon selective writing. Finally, the upper and lower plates are adhered and exhausted, and then an inert mixed gas is injected at an appropriate pressure, and then the inlet is sealed to complete the plasma display panel.

The driving of this PDP structure is started by applying an alternating voltage to the high frequency electrode 8 and the data electrode 10 of the cell to turn on the plasma. When a voltage (= writing voltage) capable of generating plasma instantaneously is applied to the high frequency electrode 8 and the data electrode 10, wall charges are formed on the surface of the dielectric layer.

2 is a diagram illustrating a conventional structure PDP driving method when the ARS (Address RF-Sustain Separated) driving method is applied, and is a driving waveform diagram supplied for an arbitrary subfield period.

During the reset period RPD, the priming pulse PP and the reset pulse RP are supplied to the data electrode. A discharge space is formed by the priming pulse PP, and reset discharge occurs in all discharge cells by the reset pulse RP, and wall charges that do not cause erroneous discharge due to self-erasing discharge or the like remain. In detail, the reset pulse RP supplied to the data electrode is supplied in the form of a ramp wave having a rising period and a falling period. The reset pulse RP generates a reset discharge in which the light emission size is not large in the rising period, thereby forming wall charges in the dielectric layer around the scan electrodes.

In the address period APD, a negative write pulse SP is supplied to the scan and high frequency electrodes in a line sequence, and a positive data pulse DP is supplied to the data electrodes to selectively write discharge. To be generated. In general, the pulse widths of the scan pulse SP and the data pulse DP are about 2.4 [mu] s, and after the application of the scan pulse and the data pulse takes about 1 [mu] s for a discharge preparation period, the selective write discharge occurs. do. Sufficient wall charges are formed in the discharge cells in which such selective write discharge has occurred, and are maintained for a period during which other discharge cells are addressed.

The trigger pulse is alternately supplied to the data electrode and the scan electrode in the RF sustain period (RF-SPD). The trigger pulses TPd and TPs start RF discharge in the discharge cells in which the wall charges are sufficiently formed, and the RF discharge is maintained during the sustain period. Plasma OFF is achieved by stopping the applied RF voltage.

In the conventional structure, the RF sustain pulse is applied between the RF sustain electrode of the upper plate and the scan electrode of the lower plate, so that an appropriate level of f, d (distance between the frequency and the RF electrode) must be maintained in consideration of the discharge efficiency. The frequency (f) and electrode (d) values should be calculated to reflect the cell design. For example, if the frequency is 40MHz, d = 0.8 ~ 1 mm is the optimum state under the discharge condition of a typical PDP. Accordingly, the height of the barrier rib must also increase in accordance with d. However, it is difficult to form a barrier rib of 200 μm or more in the conventional PDP process. For reference, currently, a barrier is manufactured by using photosensitive glass, and a panel is manufactured by combining the upper and lower panels and the partition later.

In addition, since electrodes or dielectric layers are present on the upper plate, the transmittance is low, so that a lot of visible light is lost, and when the upper plate and the lower plate are bonded, the partition wall is high, so that the alignment process is difficult.

Accordingly, it is an object of the present invention to provide a plasma display panel which can facilitate manufacturing while lowering the height of a partition by forming RF electrodes on the same surface of the lower plate instead of forming the upper and lower plates. There is.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 illustrates a conventional plasma display panel in matrix form.

2 is a driving waveform diagram when the ARS driving method is applied to a conventional invention.

3 illustrates a coplanar plasma display panel according to the present invention;

<Description of the symbols for the main parts of the drawings>

1,21: upper substrate 2,26: RF sustain electrode

3,7,9,25,28 dielectric layer 4,23 bulkhead

5,22 phosphor 6,24 protective film

8,27: high frequency electrode 10,29: data electrode

11,30: Lower board

In order to achieve the above object, a plasma display panel according to the present invention is a data electrode for applying data to be displayed on a cell and a scan which is orthogonal to the data electrode to generate an alternating address discharge for selecting a corresponding cell in the display panel. A partition between the first substrate and the first substrate on which a high frequency sustain electrode is formed in parallel with the scan electrode and to which a high frequency sustain electrode is applied to generate a high frequency sustain discharge between the scan electrodes to maintain a discharge of the selected cell. And a second substrate facing the first substrate.

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, preferred embodiments of the present invention will be described in detail with reference to FIG. 3.

3 is a cross-sectional view of a PDP according to the present invention.

3, in the PDP according to the present invention, an RF electrode is disposed in the form of a coplanar. As a result, an interval of about 1 to 0.8 mm may be provided depending on the electrode line width.

The manufacturing method thereof is described in detail as follows.

First, the upper substrate 21 is placed as it is without forming an electrode or dielectric layer. The lower plate forms a data electrode 29 for selective writing and erasing in units of cells on the lower substrate 30, and is used for addressing with the data electrode 29 thereon and used as a ground electrode of an RF signal during sustain discharge. The scan and high frequency electrode 27 is formed. Once the scan and high frequency electrodes 27 are formed, a first dielectric layer 28 for isolation is formed, and a second dielectric layer for isolation and protection of the high frequency sustain electrode 26 and plasma for maintaining high frequency discharge thereon. (25) are formed in sequence.

Finally, the protective film 24 is formed to have a dielectric layer protection and a high secondary electron emission coefficient to lower the voltage at the time of writing.

In order to turn on or off only the cells selected at the time of discharging, the plasma must be limited, thereby forming the partition 23. The phosphor 22 is applied in consideration of the transmission of visible light generated through the upper plate without disturbing the discharge generated on the lower plate at the time of writing.

Finally, the upper and lower plates are adhered and exhausted, and then an inert mixed gas is injected at an appropriate pressure, and then the inlet is sealed to complete the plasma display panel shown in FIG. 3.

Unlike the conventional matrix structure, the coplanar structure has an RF voltage applied during the sustain period slightly as the charge loss increases, but it is suitable for mass production because it is easy to manufacture.

In addition, the driving of the panel according to the present invention is also applicable to ARS (Address RF-Sustain Separated) driving method.

Because of the three-electrode structure, addressing occurs between the lower data electrode 29 and the scan and high frequency electrodes 27, and the cells selected in the addressing are caused by the triggering voltage applied between the data and the scan and high frequency electrodes 29 and 27. It supplies the seed charge needed to generate the RF plasma. The RF voltage is applied to the high frequency electrode 27 to be applied between the scan and the high frequency electrode and the scan electrode, and the plasma is turned off by stopping the applied RF voltage.

Since the distance d between the RF electrodes (RF sustain electrode and the scan and high frequency electrode) shown in FIG. 3 is influenced by the distance between the RF sustain electrode and the RF electrode on the same surface, not the distance between the upper and lower plates, Unlike the structure, it is not necessary to consider the relationship between low bulkhead height and frequency. Therefore, considering the radiation loss of the RF plasma, the appropriate partition height is about 0.5mm.

In addition to lowering the height of the partition wall, since there is no need for electrodes or dielectric layers on the top plate, there is a great advantage in the permeability and the alignment portion during manufacturing.

The phosphor is based on coating on the partition wall, and may be further applied to an appropriate position of the upper and lower plates in consideration of the addressing interference and the transmittance of the upper plate.

As described above, the present invention is to improve the power consumption and brightness, which is a problem of the commercial PDP, by applying an RF plasma which is very excellent in terms of energy efficiency and brightness compared to an alternating plasma at the time of sustain discharge of the PDP.

In the case of RF plasma, since the electric field changes rapidly by applying RF power, heavy ions are not affected by the electric field, and relatively light electrons receive energy from the electric field and vibrate according to the changing electric field. Will be When the frequency of the applied RF power is increased and the distance between the electrodes of the upper and lower plates is increased, the collision of electrons is made between the gas molecules inside the plasma and not the upper and lower plates. The collision between electrons and gas molecules generates plasma, and in particular, the excitation process of generating light, which determines efficiency in PDP, is more than five times higher than the AC type, which is very advantageous in terms of efficiency.

As described above, according to the plasma display panel according to the present invention, the RF electrode is not formed on the upper and lower plates, but is formed on the same surface of the lower plate. Accordingly, manufacturing can be facilitated while lowering the height of the partition wall, and the loss of visible light can be minimized.

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 (4)

A data electrode for applying data to be displayed in a cell; A scan electrode formed to be orthogonal to the data electrode to cause an AC address discharge to select a corresponding cell in the display panel; A first substrate formed in parallel with the scan electrode and having a high frequency sustain electrode to which a high frequency voltage is applied to generate a high frequency sustain discharge between the scan electrodes to maintain a discharge of the selected cell; And a second substrate facing the first substrate with a partition therebetween. The method of claim 1, The high frequency voltage is a plasma display panel, characterized in that the high frequency of several tens to several hundred Mhz. The method of claim 1, A first dielectric layer formed between the data electrode and the sustain electrode pair to insulate the electrodes; A second dielectric layer formed on the first dielectric layer to cover the sustain electrode pair; And a passivation layer formed entirely on the second dielectric layer. The method of claim 1, And a phosphor formed on the partition wall.