KR100548253B1 - Plasma display panel device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel device. In particular, a floating electrode added by forming a floating electrode in a discharge space between transparent electrodes in a long-column structure for using a positive light region having a high discharge efficiency in addition to a bulow region. The present invention relates to a plasma display panel device in which charge accumulated in the battery assists electron diffusion during discharge, thereby lowering the discharge voltage and increasing efficiency. In the conventional plasma display panel device having a long-column structure, the distance between the scan electrode and the sustain electrode formed on the upper plate of the device is longer than the distance between the upper and lower plates for a sufficient discharge path, and the address electrodes of the scan electrode and the lower plate are disposed. Since a weak discharge is generated using the positive charge accumulated in the sustain electrode, the positive charge of the sustain electrode decreases due to the diffusion of electrons, thereby reducing the luminance efficiency and requiring a high discharge voltage. In view of the above problems, the present invention provides a plasma display in which floating electrodes formed of transparent electrodes are uniformly disposed adjacent to each electrode between transparent electrodes of a long-column structure formed at a sufficient distance from the upper surface of the plasma display device. By providing the panel element, the charge accumulated in the floating electrode supports the diffusion of the weak discharge generated between the scan electrode and the lower address electrode, thereby lowering the discharge voltage and improving luminance and efficiency.

Description

Plasma Display Panel Device {PLASMA DISPLAY PANEL DEVICE}

1 is a cross-sectional view showing a typical plasma display panel device.

2A to 2C are state flow charts showing states of discharges occurring in a plasma display panel device having a general long-column structure.

Figure 3 is a plan view showing a top plate structure of a plasma display panel element of a conventional long-column structure.

Figure 4 is a plan view showing a top structure of the plasma display panel element of an embodiment of the present invention.

5A-5B are light output distribution simulation diagrams of the present invention and prior art structures.

Figures 6a to 6b is a top view one side view of other embodiments of the present invention.

*** Explanation of symbols for main parts of drawing ***

31: glass substrate 32: transparent electrode

33: bus electrode 34: floating electrode

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel device, and more particularly to a floating electrode in a discharge space between transparent electrodes in a long-column structure for using a positive column region having a high discharge efficiency in addition to a negative glow region. The present invention relates to a plasma display panel device in which charge accumulated in an additional floating electrode assists electron diffusion during discharge, thereby lowering a discharge voltage and increasing efficiency.

Plasma display panel devices (PLSama Display Panels, hereinafter referred to as PDPs), which are spotlighted as next-generation display devices together with TFT liquid crystal display (LCD), organic EL, and FED, are contained in discharge cells isolated by barrier ribs. 147 nm ultraviolet rays generated during the discharge of He + Xe or Ne + Xe gas excite R, G, B phosphors and use the luminescence caused by the energy difference when the phosphors return from the excited state to the ground state Element. The PDP display device is expected to occupy the large display device market of 40 kHz or more due to its simple structure, high brightness, high light emission efficiency, memory function, high nonlinearity, and wide viewing angle of 160 ° or more.

1 is a cross-sectional view showing a general AC PDP device, first of which a lower plate of the PDP device is deposited on the entire surface of the lower glass substrate 1 to prevent penetration of alkali ions contained in the substrate 1; An address electrode 3 of a discharge cell formed on a part of the blocking film 2; A lower plate dielectric 4 formed on the entire surface of the blocking film 2 including the address electrode 3; Barrier ribs 5 formed on the lower plate dielectric 4 to isolate discharge cells; It consists of phosphor 6 formed on the lower plate dielectric 4 isolated by the said partition 5.

The upper panel of the plasma display panel element includes a transparent electrode 12 formed on the upper glass substrate 11 and a bus electrode 13 for lowering the resistance of the transparent electrode 12; A lower dielectric 14 formed on the front surface of the upper glass substrate 11 including the transparent electrode 12 and the bus electrode 13 and an upper dielectric 15 formed on the front surface of the lower dielectric 14; The protective film 16 is formed on the entire surface of the upper dielectric 15 to protect the upper dielectric 15 due to the plasma discharge. The upper plate formed as described above includes a protective film 16 having the barrier rib 5 and the phosphor ( It is installed to face 6).

In this case, an indium tin oxide (ITO) thin film is generally applied to the transparent electrode 12, and the lower dielectric 14 is in direct contact with the transparent electrode 12 and the bus electrode 13, and thus, the transparent electrode 12 ) And the softening point should be high to avoid chemical reaction with the bus electrode 13, and the upper dielectric 15 has a higher smoothness as the protective film 16 is formed thereafter, so that the softening point is lower than that of the lower dielectric 14. This should be as low as tens of degrees Celsius.

In the upper plate structure of the general plasma display device, electrodes formed as a pair of transparent electrodes 12 and bus electrodes 13 operate as scan electrodes and sustain electrodes, and discharge due to a voltage difference provided In this case, since the distances of the electrodes in which the discharges are generated are very close to each other, the discharge uses only the negative glow region and thus has a low efficiency of about 1 to 2 lm / W.

Therefore, a long-column structure (generally forming a discharge path of 300 µm or more) has been proposed in which a distance between electrodes is extended to use a positive column region for higher discharge efficiency. In general, when comparing the luminance of light emitted from the bouglow and the bright wine, the brightness of the bright glow area is higher, but the bright glow area is limited, whereas the bright wine area increases as the distance between the electrodes increases. Considering the total amount of light, the amount of occupancy in the Yanggwangju area is very large.

2A to 2C are cross-sectional views illustrating procedures of initiating and maintaining a discharge during a sustain period in a conventional long-column structure. As shown in FIG. .

First, as shown in FIG. 2A, a lower plate having an address electrode 21, also called a data electrode, is formed on a glass substrate 20, and an upper plate of the PDP element is spaced apart from the lower plate. The long-column PDP top plate includes transparent electrodes 23 formed on the upper glass substrate 22 at a substantially long distance, and bus electrodes formed on the transparent electrodes to improve electrical characteristics. 24) and a dielectric for forming a wall voltage on the electrodes and a protective layer 25 protecting the same. As shown in the drawing, electrodes arranged in pairs consisting of an indium tin oxide (ITO) and a bus electrode are divided into scan electrodes and sustain electrodes, respectively.

In a typical PDP device, the discharge is caused by the voltage difference between the scan electrode and the sustain electrode. However, in the long-column structure, the distance between the electrodes is maximized to 300 μm or more at 0.81 mm pixel interval, for example. It is difficult to generate a discharge with the voltage difference between them. Accordingly, a method of generating a discharge between the scan electrode and the address electrode having a narrower interval and diffusing it to the sustain electrode is used.

As shown in the figure, the negative and positive charges are accumulated on the scan electrode and the address electrode during the reset and address periods of the electrode driving step, and the positive and negative charges are accumulated on the sustain electrode, and then a negative voltage bias is applied to the scan electrode and the sustain electrode. Since the scan electrode and the address electrode are closer to each other, weak discharge occurs between them. The discharge generated in this case is not visible by the opaque bus electrode forming the scan electrode. At this time, the sub-low glow part by the initial discharge is formed between the upper and lower plates.

Thereafter, as shown in FIG. 2B, electrons are diffused toward the sustain electrode by the potential difference between the scan electrode and the sustain electrode to form a positive column. Above the portion of the distilled liquor is the bouglow.

As shown in FIG. 2C, the positive light column region extends from the scan electrode to all the regions of the sustain electrode to emit brighter light. In this case, the efficiency is over 7lm / W.

FIG. 3 is a plan view showing a PDP element top structure having a long-column structure. As shown in FIG. 3, transparent electrodes 23 are disposed on the upper glass substrate 22 by a distance d, and the transparent electrodes ( 23) The bus electrode 24 is passing over. The discharge is generated in the region between the transparent electrodes 23. As shown in the foregoing, the distance d between the electrodes serves as a discharge path and should be long enough to have a positive light region and must be longer than the distance between the upper and lower plates.

However, in the conventional long-column structure, in order to form a discharge due to the voltage difference between the electrodes positioned on the element top plate, a weak discharge must be generated between the scan electrode and the address electrode and then diffused to the sustain electrode. Is required. In other words, if the electrons generated by the weak discharge are diffused using the positive charges formed on the sustain electrode, the positive charges formed on the electrons and the sustain electrode are canceled, so the discharge voltage must be high and the efficiency is reduced due to the charge offset.

Plasma display panel elements having a conventional long-column structure as described above are disposed such that the distance between the scan electrode and the sustain electrode formed on the element upper plate is longer than the distance between the upper and lower plates for the sufficient discharge path, and the scan electrode and the lower plate. A weak discharge is generated by using the address electrode of the electrode and then diffused using the positive charge accumulated in the sustain electrode. As a result, since the positive charge of the sustain electrode decreases with the diffusion of electrons, the luminance efficiency is reduced and a high discharge voltage is required. There was this.

The present invention for solving the conventional problems as described above is to arrange the floating electrodes formed of transparent electrodes adjacent to each of the electrodes between the transparent electrodes formed at a sufficient distance from the top plate so that charges accumulate in the floating electrodes. Accordingly, an object of the present invention is to provide a plasma display panel device capable of easily discharging a discharge generated between a scan electrode and an address electrode of a lower plate to lower a discharge voltage and improve brightness and efficiency.

In order to achieve the above object, an embodiment of the present invention includes a lower plate formed with an address electrode; An upper plate disposed opposite the address electrode of the lower plate, the upper plate having a pair of upper plate electrodes spaced apart from each other by longer distance than the opposite address electrode; At least one transparent floating electrode is disposed to be adjacent to each electrode in the upper discharge region between the upper electrodes.

The number of the transparent floating electrodes is two and the transparent floating electrodes are disposed adjacent to each other by the same distance as the electrodes of the upper plate, and the distance between the transparent floating electrodes is smaller than the distance between the upper electrode and the transparent floating electrode. It is characterized by being arranged to be long.

The present invention as described above is described in detail through various embodiments as follows.

4 is a plan view of a PDP top plate according to an embodiment of the present invention. As shown in FIG. 4, an electrically independent floating (e.g.) is separated between transparent electrodes 32 formed at a sufficient distance d on the top glass substrate 31. Floating electrodes 34 are formed in pairs using transparent ITO. Since the floating electrodes 34 are formed of the transparent electrodes, there is no decrease in luminance, and since the floating electrodes are not connected to a separate electrode, the configuration is very simple.

The formed transparent electrodes 32 and the bus electrodes 33 are scan electrodes and sustain electrodes, respectively, and the positions of the transparent electrodes 32 and the bus electrodes 33 are symmetrical. In the illustrated embodiment, the newly added transparent floating electrodes 34 are disposed to be spaced apart from each of the transparent electrodes 32 and have the same distances d1 and d3 from the transparent electrodes 32. Configure. However, the distance d2 between the transparent floating electrodes 34 is preferably longer than the distances d1 and d3 between the transparent electrodes 32 and the transparent floating electrodes 34. In other words, it is most efficient to maintain the relationship of d1 = d3 and d2> d1 = d3.

The transparent floating electrodes 34 accumulate at the same time when charge is accumulated in the transparent electrodes 32 and the lower address electrode (not shown) during the reset and the address time. Subsequently, when a weak discharge generated between the scan electrode and the address electrode is diffused in the sustaining step, a lower discharge voltage may be used because the charge accumulated in the floating transparent electrodes 34 helps the electrons to diffuse. And efficiency also has the effect of improving.

FIG. 5 is a simulation of the light output distribution of the embodiment of the present invention shown in FIG. 4 and the conventional structure in which the transparent floating electrode is not formed. The distance between the transparent electrodes in this embodiment and the conventional impregnation is 360 μm. In this embodiment, the size of the transparent floating electrode was formed to each 70㎛ 80㎛. In addition, the distance between the transparent floating electrodes is arranged to be 70㎛.

As shown, in the case of applying the present invention, it can be seen that the region having the strongest light output is widely located at the center, and that the luminance and the intensity of the region having the strongest light output are wider than the conventional long-column (LC) structure. It can be seen that the efficiency has increased.

See the following table for a more numerical comparison. In the improved structure of the present invention, the size is expressed as (width μm × length μm).

Electrode structure Discharge efficiency (%) Luminous Efficiency (lm / W) Luminance (cd / m ² ) Max light output (#) Current (mA) Existing structure 24.7 2.32 3533.4 6.45E + 07 0.501 Improvement structure (80 × 60) 25.1 2.34 3572.2 6.54E + 07 0.499 Improvement structure (70 × 80) 25.0 2.34 3569.2 6.53E + 07 0.492 Improved Structure (40 × 60) 24.9 2.35 3590.9 6.70E + 07 0.530

As can be seen from Table 1, it can be seen that the structure in which two transparent floating electrodes are inserted as in the exemplary embodiment of the present invention is improved in luminance and efficiency characteristics compared to the conventional structure. It can also be seen that the area of the transparent floating electrode applied can be set properly according to the structure to be applied to achieve higher efficiency. However, no matter what size structure is used, it will be appreciated that the formation of a transparent floating electrode between the transparent electrodes increases the brightness and efficiency.

6A to 6B illustrate a modified embodiment of the present invention. FIG. 6A illustrates a structure in which the transparent floating electrode 34 is divided and disposed in the structure shown in FIG. 4. The distance is configured to be the same. That is, the transparent floating electrodes 34 may be arranged with one or more transparent floating electrodes spaced apart from the transparent electrode by the same distance, and are arranged symmetrically with respect to an intermediate point between the transparent electrodes 32. desirable. That is, in this case, the distance between each transparent floating electrode 34 and the adjacent transparent electrodes 32 is the same distance, so that d1 and the distance between the symmetric transparent floating electrodes 34 is d2. Place it so that d2> d1.

6B is for forming the transparent floating electrodes 34 without alignment, and having the same separation distance between the transparent electrodes 32 between the transparent electrodes 32 formed by a bus with respect to the entire upper plate of the device. The transparent floating electrodes 34 are uniformly disposed on the entire upper plate so as to be adjacent to each other. Through this structure, the present invention can be more easily applied.

As described above, the transparent discharge electrodes that are not connected to the electrodes without separate electrodes or complicated structural changes may be disposed adjacent to the transparent electrodes so as to be symmetrical in one cell, thereby lowering the high discharge voltage and increasing luminance and efficiency. Will be.

As described above, in the plasma display panel device of the present invention, the floating electrodes formed of transparent electrodes are uniformly disposed adjacent to each of the electrodes between the transparent electrodes of the long-column structure formed at a sufficient distance from the upper surface of the device. The charges accumulated in the support to diffuse the weak discharge generated between the scan electrode and the lower address electrode has the effect of lowering the discharge voltage and improving the brightness and efficiency.

Claims (4)

A lower plate on which an address electrode is formed; An upper plate disposed opposite the address electrode of the lower plate, the upper plate having a pair of upper plate electrodes spaced apart from each other by longer distance than the opposite address electrode; And at least one transparent floating electrode disposed adjacent to each electrode in a top discharge region between the top electrodes. The method of claim 1, wherein the number of the transparent floating electrodes is two and the transparent floating electrodes are disposed adjacent to each other by the same distance as the electrodes of the upper plate, and the distance between the transparent floating electrodes is the upper electrode and the transparent electrode. Plasma display panel element, characterized in that disposed longer than the distance between the floating electrodes. The plasma of claim 1, wherein the transparent floating electrodes are arranged with one or more transparent floating electrodes spaced apart from the upper electrode by the same distance, and are arranged to be symmetrical with respect to an intermediate point between the upper electrode. Display panel elements. The method of claim 1, wherein the transparent floating electrode is arranged evenly arranged so as to be adjacent to each of the top plate electrodes having the same separation distance between the top plate electrodes formed in a bus shape with respect to the entire top plate so that alignment is not necessary. Plasma display panel element.

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