KR20040055420A - Plasma Display Pannel Capable of High Efficiency - Google Patents

Abstract

PURPOSE: A plasma display panel is provided to reduce a sheath zone and achieve improved efficiency of generation of vacuum ultraviolet ray by arranging an intermediate electrode between surface electrodes such that the intermediate electrode serves as an anode electrode. CONSTITUTION: A plasma display panel comprises a front glass substrate(41) and a rear glass substrate(42); an X-surface electrode(53) and a Y-surface electrode(54) arranged in parallel with each other on the inner surface of the front glass substrate; an intermediate electrode(56) interposed between the X-surface electrode and the Y-surface electrode; a dielectric layer(44) covering the X-surface electrode, Y-surface electrode, and the intermediate electrode; an address electrode(55) arranged in the direction perpendicular to the X and Y-surface electrodes and the intermediate electrode on the inner surface of the rear glass substrate; a dielectric layer(44') covering the address electrode; barrier ribs(47) formed on the dielectric layer on the rear glass substrate; and red, green, and blue phosphors deposited between the barrier ribs.

Description

Plasma Display Panel Capable of High Efficiency

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel in which discharge efficiency can be improved by disposing an intermediate electrode between a pair of surface electrodes.

In general, a plasma display panel is used to display an image using a gas discharge phenomenon, and is excellent in various display capacities such as display capacity, brightness, contrast, afterimage, viewing angle, etc., and has been spotlighted as a device that can replace CRT. . In such a plasma display panel, a discharge is generated in a gas between the electrodes by a direct current or an alternating voltage applied to the electrode, and the phosphor emits light by exciting the phosphor by radiation of ultraviolet rays.

FIG. 1 is a schematic exploded perspective view of a typical AC plasma display panel.

Referring to the drawings, a pair of X surface electrodes 3 and Y surface electrodes 4 corresponding to the display electrodes are formed on the inner surface of the front glass substrate 11, and on the inner surface of the rear glass substrate 12. The address electrode 5 is formed. The surface electrodes 3 and 4 form a pair of an X electrode and a Y electrode, and sustain discharge occurs during operation between the pair of X and Y surface electrodes 3 and 4. The X surface electrode 3, the Y surface electrode 4, and the address electrode 5 are formed in strip shapes on the inner surfaces of the front glass substrate 11 and the back glass substrate 12, respectively, and the substrate 11, When 12) are assembled together, they cross at right angles to each other.

The dielectric layer 14 and the protective layer 15 are sequentially stacked on the inner surface of the front glass substrate 11. On the other hand, in the back glass substrate 12, the partition 17 is formed on the upper surface of the dielectric layer 14 ', and the cell 19 is formed by the partition 17. Cell 19 is filled with inert gases such as neon and xenon. In addition, the phosphor 18 is applied to a predetermined portion inside the partition wall 17 forming each cell 19. On the other hand, the reference numeral 6 denotes a bus electrode, and the X and Y surface electrodes 3, for the purpose of preventing the phenomenon that the line resistance also increases as the length of the X and Y surface electrodes 3, 4 increases. It is formed on the surface of each 4).

Referring to the operation of the plasma display panel having the above configuration schematically, first, a trigger voltage of a high voltage is applied to cause a discharge between the address electrode 5 and any one surface electrode. When cations are accumulated in the dielectric layer 14 by the trigger voltage, discharge occurs. When the trigger voltage exceeds the threshold voltage, the discharge gas or the like charged in the cell 19 becomes a plasma state by discharge, and is stable between the X surface electrode 3 and the Y surface electrode 4. It can be maintained (see Fig. 2). In this sustain discharge state, the light in the ultraviolet region collides with the phosphor 18 in the discharge light and emits light, so that each pixel formed for each cell 19 can display an image.

FIG. 2 is a cross-sectional view of a part of the plasma display panel shown in FIG. 1, and FIG. 3 is a graph showing waveforms of voltages applied to the electrodes of the plasma display panel.

In Fig. 2, a pair of display electrodes X surface electrode 3 and Y surface electrode 4 are formed on the inner surface of the front glass substrate 11, and an address electrode (on the inner surface of the back glass substrate 12) is formed. It can be seen that 4) is formed.

Referring to FIG. 3, which shows waveforms of voltages applied to the electrodes while sustain discharge is in progress, the horizontal axis represents time, and the horizontal axis representing time is divided into sections in FIGS. In addition, the vertical axis represents voltage. In the entire section, the address electrode maintains the reference voltage, which is O volts, while the voltage applied to the X surface electrode 3 and the Y surface electrode 4 changes for each section. Corresponds to V _s . That is, in the first section 31, the third section 33, and the fifth section 35, the sustain voltage applied to the X surface electrode 3 is V _s , while the sustain voltage is applied to the Y surface electrode 4. The voltage that is used is 0 volts, which is a reference voltage, so that a discharge may occur as the voltage difference between electrodes is V _s . Similarly, in the second section 32 and the fourth section 34, 0 volts is applied to the X surface electrode 3, while V _s is applied to the Y surface electrode 4 to generate a discharge. That is, as time passes, the X and Y surface electrodes 3 and 4 are alternately applied with the sustain voltage V _S and the reference voltage, thereby changing the roles of the anode and the cathode.

It is known that in the plasma display panel having the arrangement of the surface electrodes 3 and 4 as described above, much energy loss occurs in the region proximate to the cathode. That is, a region close to the cathode is referred to as a so-called sheath zone, and the electric field is relatively strong in the sheath region, so that a negative glow phenomenon occurs, and thus there is a problem in that luminous efficiency is lowered. On the other hand, since the arrangement of the X and Y surface electrodes are arranged in the order of XY-YX, there is a problem that wrong addressing may occur for adjacent Y electrodes.

The present invention has been made to solve the above problems, an object of the present invention is to provide a plasma display panel with improved luminous efficiency.

Another object of the present invention is to provide a plasma display panel in which negative glow phenomenon in the sheath region can be prevented.

Another object of the present invention is to provide a plasma display panel in which luminous efficiency is improved by disposing an intermediate electrode between surface electrodes and controlling the magnitude of voltage applied to each of the electrodes.

1 is a schematic exploded perspective view of a conventional plasma display panel.

2 is a cross-sectional view of a part of the plasma display panel shown in FIG. 1.

3 is a graph showing waveforms of voltages applied to the electrodes of the plasma display panel.

4 is a schematic perspective view of a plasma display panel according to the present invention.

5 is a schematic cross-sectional view of a part of the plasma display panel shown in FIG. 4.

6 to 10 are graphs schematically showing waveforms of voltages applied to the electrodes.

Shown in FIG. 11 is a schematic cross-sectional view of a portion of a second embodiment of a plasma display panel according to the present invention.

12 is a schematic cross sectional view of a portion of a second embodiment of a plasma display panel according to the present invention.

13 is a graph showing the generation efficiency of vacuum ultraviolet rays according to the width of the intermediate electrode.

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

11.12. 3. X surface electrode on glass substrate

4. Y surface electrode 5. Address electrode

14,14 '. Dielectric Layer 15. Protective Layer

17. Bulkhead 18. Phosphor

56. Middle electrode

In order to achieve the above object, according to the present invention, a front glass substrate and a back glass substrate; An X surface electrode and a Y surface electrode formed in parallel to an inner surface of the front glass substrate; An intermediate electrode disposed between the X surface electrode and the Y surface electrode; A dielectric layer covering the X surface electrode, the Y surface electrode, and the intermediate electrode; An address electrode formed on the inner surface of the rear glass substrate in a direction orthogonal to the X and Y surface electrodes and an intermediate electrode; A dielectric layer covering the address electrode; Barrier ribs formed over the dielectric layer on the rear glass substrate; Provided is a plasma display panel including red, green, and blue phosphors respectively applied between the partition walls.

According to an aspect of the present invention, a cathode voltage and an anode voltage are alternately applied to the X surface electrode and the Y surface electrode, and a uniform anode extension voltage having a voltage level higher than the cathode voltage is applied to the intermediate electrode.

According to another feature of the present invention, a cathode voltage and an anode voltage are alternately applied to the X surface electrode and the Y surface electrode, and an anode extension voltage of a pulse waveform having a voltage level higher than the cathode voltage is applied to the intermediate electrode.

According to another feature of the invention, the intermediate electrode includes a first intermediate electrode and a second intermediate electrode parallel to each other.

According to another feature of the invention, the voltage applied to the first intermediate electrode and the second intermediate electrode is applied as a common voltage.

According to another feature of the present invention, the X surface electrode includes a first X electrode and a second X electrode parallel to each other, and the Y surface electrode includes a first Y electrode and a second Y electrode parallel to each other. do.

According to another feature of the invention, the voltage applied to the first X electrode and the second X electrode is applied as a common voltage, the voltage applied to the first Y electrode and the second Y electrode is a common voltage Is applied as.

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

As mentioned above, a negative glow phenomenon occurs because the electric field is strong in the sheath zone defined in proximity to the cathode in the plasma display panel. As an alternative to reducing this phenomenon, it has been proposed to extend the length of the electrode. It is known that as the length of the electrode is extended, the efficiency of the cathode itself decreases and the efficiency of the anode increases, thus the overall energy efficiency increases. Accordingly, the present invention focuses on reducing negative glow in the sheath region by providing a separate electrode that can extend the length or area of the anode in order to amplify the effect of the efficient anode.

4 is a schematic perspective view of a plasma display panel according to the present invention.

Referring to the drawings, the plasma display panel according to the present invention includes a front glass substrate 41 and a back glass substrate 42. An X surface electrode 53 and a Y surface electrode 54 are formed on the inner surface of the front glass substrate 41. In addition, a bus electrode 46 is formed on the X surface electrode 53 and the Y surface electrode 53. The dielectric layer 44 and the protective layer 45 are sequentially formed on the X and Y surface electrodes 53 and 54.

Meanwhile, an address electrode 55 is formed on the surface of the rear glass substrate 42, and a dielectric layer 44 ′ is formed on the address electrode 55. The partition wall 47 is formed on the dielectric layer 44 ′ to form a cell 49 that is a discharge space between the partition walls 47. Phosphor 47 is coated on the surface of the partition wall 47 in the cell space between the partition walls 47. The X and Y surface electrodes 53 are formed at right angles to the address electrode 55.

According to a feature of the present invention, an intermediate electrode 56 is formed between the pair of X surface electrodes 53 and Y surface electrodes 54 formed on the surface of the front glass substrate 41. As is known, the discharge sustain voltage is applied between the X surface electrode 53 and the Y surface electrode 54 to serve as a cathode and an anode electrode. ) Is applied to a voltage higher than the base voltage of the discharge sustain voltage applied between the anode electrode and the cathode electrode, thereby serving as a second anode electrode.

5 is a schematic cross-sectional view of a part of the plasma display panel shown in FIG. 4. Here, it can be seen that the intermediate electrode 56 is formed between the X surface electrode 53 and the Y surface electrode 54.

When a voltage higher than the base voltage of the discharge sustain voltage applied between the anode electrode and the cathode electrode is applied to the intermediate electrode 56, the intermediate electrode 56 always serves as the anode electrode. That is, the middle electrode 56 can also play the role of the anode electrode which the X surface electrode 53 and the Y surface electrode 54 alternately play. In this way, the discharge sustain voltage is applied such that any one of the X surface electrode 53 and the Y surface electrode 54 becomes the anode electrode, and at the same time the base voltage of the discharge sustain voltage so that the intermediate electrode 56 becomes the anode electrode. By applying a higher level of voltage, the area of the entire anode electrode can be kept expanded. If the voltage applied to the intermediate electrode 56 is defined as the anode extension voltage Vm, the anode extension voltage Vm may be a voltage of a uniform level or a voltage in the form of a pulse. When the anode extension voltage Vm is a voltage of a uniform level, the voltage must always be greater than the base voltage of the discharge sustain voltage Vs, and even when the anode extension voltage Vm is a pulse voltage. The highest value of must be greater than the base voltage of the discharge sustain voltage Vs. Meanwhile, a bus electrode (not shown) may be formed on the intermediate electrode 56 to overcome the line resistance of the electrode itself and maintain the voltage.

6 to 10 are graphs schematically showing waveforms of voltages applied to the electrodes. In each graph, the horizontal axis represents time intervals and the vertical axis represents voltage levels.

Referring to FIG. 6, a -Vs volt having a lower level than the base voltage is applied to the X surface electrode X and a 0 volt, which is the base voltage, is applied to the Y surface electrode Y in the first section 61. At this time, the X surface electrode X becomes a cathode, the Y surface electrode Y becomes an anode, and the voltage difference between the two surface electrodes is Vs, so that the discharge can be maintained. That is, the voltage (-Vs) applied to the X surface electrode X becomes a cathode voltage, and the voltage applied to the Y surface electrode Y becomes an anode voltage. In addition, in the second section 62, a ground voltage of 0 volts is applied to the X surface electrode X and a -Vs volt is applied to the Y surface electrode Y to change the roles of the cathode and the anode. The discharge sustain voltage is repeatedly applied in the third section 63 and the fourth section 64, thereby changing the roles of the cathode and the anode.

In FIG. 6, an anode extension voltage Vm is applied to the intermediate electrode M over each section. The anode extension voltage Vm is a voltage higher than the cathode voltage -Vs. That is, it has a relationship of Vm> -Vs.

By maintaining the voltage level as shown in FIG. 6, the intermediate electrode M may serve as an anode. Accordingly, the area of the cathode is relatively reduced since the intermediate electrode M may serve as an anode together with any one of the alternating X and Y surface electrodes. This increase in anode area and reduction in cathode area reduce the sheath area as described above, thus making it possible to reduce energy losses.

Referring to FIG. 7, in the first section 71, a voltage of Vs is applied to the X surface electrode X, and 0 volts, which is a base voltage, is applied to the Y surface electrode Y. In FIG. Therefore, the sustain discharge can be made as the voltage difference between the surface electrodes X and Y as Vs, where the cathode voltage is O volts and the anode voltage is Vs. At this time, the intermediate electrode M is applied as a pulse voltage Vm larger than the cathode voltage of 0 volts.

On the other hand, in the second section 72, the voltage applied to the X surface electrode X and the Y surface electrode Y is reversed in a state opposite to the first section. In addition, in the third section and subsequent sections, the state of the voltage applied to the X surface electrode X and the Y surface electrode Y is alternately changed. At this time, the same pulse voltage (Vm) is applied in each section, the maximum value of the pulse voltage is applied to be greater than 0 volts, the cathode voltage.

Referring to FIG. 8, a voltage of Vs / 2 is applied to the X surface electrode X and -Vs / 2 volts is applied to the Y surface electrode Y in the first section 81. Therefore, the voltage difference between the X surface electrode X and the Y surface electrode Y becomes Vs, the cathode voltage is -Vs / 2 volts and the anode voltage is Vs / 2. At this time, a pulse voltage Vm greater than the cathode voltage -Vs / 2 is applied to the intermediate electrode M. FIG. On the other hand, in the second section 82, all of the voltages applied to the X surface electrode X, the Y surface electrode Y, and the intermediate electrode M become O volts which is a base voltage state. Next, the third section 83 is reversed to the state opposite to the first section 81. Next, in the fourth section 84, the voltages applied to the X surface electrode X, the Y surface electrode Y, and the intermediate electrode M are in the zero voltage state similarly to the second section. In the subsequent odd-numbered sections, the state of the voltage applied to the X surface electrode X and the Y surface electrode Y is alternately changed, and in the even-numbered sections, zero voltage is applied. The pulse voltage is larger than the cathode voltage -Vs / 2. At this time, the same address voltage Va is applied in each section, and the address voltage is also applied larger than the cathode voltage.

9, a voltage of Vs / 2 is applied to the X surface electrode X and -Vs / 2 volts is applied to the Y surface electrode Y in the first section 91. In this case, a voltage Vm greater than the cathode voltage -Vs / 2 is applied to the intermediate electrode M. The voltage applied to the intermediate electrode M is kept constant over the entire period. Meanwhile, in the second section 92, the voltage applied to the X surface electrode X and the Y surface electrode Y is reversed in a state opposite to that of the first section 91. In addition, in the third section 93 and the subsequent sections 94 and 95, the states of voltages applied to the X surface electrode X and the Y surface electrode Y are alternately changed.

Referring to FIG. 10, a voltage of Vs / 2-Va volts is applied to the X surface electrode X and -Vs / 2-Va volts is applied to the Y surface electrode Y in the first section 101. Therefore, the voltage difference between the X surface electrode X and the Y surface electrode Y is Vs. In this case, a pulse voltage Vm greater than the cathode voltage -Vs / 2-Va volt is applied to the intermediate electrode M. On the other hand, in the second section 102, all of the voltages applied to the X surface electrode X, the Y surface electrode Y, and the intermediate electrode M become -Va which is the base voltage. The base voltage (−Va) is a voltage applied to the address electrode. Next, in the third section 103, the voltage applied to the X surface electrode X and the Y surface electrode Y is reversed to the state opposite to the first section 101. The next fourth section 104 is in the same state as the second section 102, and then in odd-numbered sections, the voltage applied to the X surface electrode X and the Y surface electrode Y is equal to the cathode voltage. It is alternately applied as the anode voltage and becomes the base voltage -Va in even intervals. At this time, the pulse voltage Vm is applied in the odd section, and the reference voltage is applied in the even section.

Shown in FIG. 11 is a schematic cross sectional view of a portion of a second embodiment of a plasma display panel according to the present invention, which is similar to FIG.

Referring to the drawings, the first intermediate electrode 117 and the second intermediate electrode 118 are formed on the inner surface of the front glass substrate 111 between the X surface electrode 113 and the Y surface electrode 114. It can be seen that. A dielectric layer 116 is formed to cover the electrodes, and a protective layer 121 covers the dielectric layer 116. In addition, an address 115 is formed on an inner surface of the rear glass substrate 112, and the dielectric layer 116 ′ covers the address electrode 115. Denoted by reference numeral 120 is a discharge space formed between the front glass substrate 111 and the back glass substrate 112. In the embodiment of FIG. 11, the intermediate electrode is formed of at least one intermediate electrode, that is, the first intermediate electrode 117 and the second intermediate electrode 118.

Shown in FIG. 12 is a schematic cross sectional view of a portion of a second embodiment of a plasma display panel according to the present invention, which is similar to FIG.

Referring to the drawings, the first X surface electrode 128 and the second X surface electrode 129 are formed on the inner surface of the front glass substrate 121, and the first Y surface electrode 133 is formed. ) And a second Y surface electrode 133 are formed. It can be seen that the first intermediate electrode 130 and the second intermediate electrode 131 are formed between the second X surface electrode 129 and the second Y surface electrode 132. A dielectric layer 123 is formed to cover the electrodes, and a protective layer 124 covers the dielectric layer 123. In addition, an address electrode 127 is formed on an inner surface of the rear glass substrate 122, and the dielectric layer 126 covers the address electrode 127. Denoted by reference numeral 125 is a discharge space formed between the front glass substrate 121 and the back glass substrate 122. In the embodiment of FIG. 12, surface electrodes and intermediate electrodes are formed as one or more electrodes. The voltage applied to each of the electrodes is applied to a common voltage to the first X electrode 128 and the second X electrode 129, and the first Y electrode 133 and the second Y electrode 132. The common voltage is applied to the first intermediate electrode 117 and the second intermediate electrode 118. In this case, the applied voltage is the same as the voltage described with reference to FIGS. 6 to 10.

13 is a graph showing the generation efficiency of vacuum ultraviolet rays according to the width of the intermediate electrode.

Referring to the drawings, it can be seen that as the length of the intermediate electrode increases, the generation efficiency of vacuum ultraviolet rays increases proportionally together. For example, the vacuum ultraviolet generation efficiency was less than about 41 pro when the width of the intermediate electrode was about 40 micrometers, indicating that the vacuum ultraviolet generation efficiency increased to about 45 pro when the width of the intermediate electrode was increased to 180 microns. Able to know.

Plasma display panel according to the present invention has the advantage that the intermediate electrode can serve as the anode electrode by disposing the intermediate electrode between the surface electrodes, and thus the sheath area is reduced and the vacuum ultraviolet generation efficiency is improved.

Although the present invention has been described with reference to the embodiments illustrated in the accompanying drawings, it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true scope of the invention should be defined only by the appended claims.

Claims (8)

A front glass substrate and a back glass substrate; An X surface electrode and a Y surface electrode formed in parallel to an inner surface of the front glass substrate; An intermediate electrode disposed between the X surface electrode and the Y surface electrode; A dielectric layer covering the X surface electrode, the Y surface electrode, and the intermediate electrode; An address electrode formed on the inner surface of the rear glass substrate in a direction orthogonal to the X and Y surface electrodes and an intermediate electrode; A dielectric layer covering the address electrode; Barrier ribs formed over the dielectric layer on the rear glass substrate; And red, green, and blue phosphors respectively applied between the partition walls. The method of claim 1, And a cathode voltage and an anode voltage are alternately applied to the X surface electrode and the Y surface electrode, and a uniform anode extension voltage having a higher voltage level than the cathode voltage is applied to the intermediate electrode. The method of claim 1, And a cathode voltage and an anode voltage are alternately applied to the X surface electrode and the Y surface electrode, and an anode extension voltage having a pulse waveform having a voltage level higher than the cathode voltage is applied to the intermediate electrode. The method of claim 1, And the intermediate electrode includes a first intermediate electrode and a second intermediate electrode parallel to each other. The method of claim 4, wherein And a voltage applied to the first intermediate electrode and the second intermediate electrode as a common voltage. The method of claim 1, The X surface electrode includes a first X electrode and a second X electrode that are parallel to each other, and the Y surface electrode includes a first Y electrode and a second Y electrode that are parallel to each other. . The method of claim 6, The voltage applied to the first X electrode and the second X electrode is applied as a common voltage, and the voltage applied to the first Y electrode and the second Y electrode is applied as a common voltage. Display panel. The method of claim 1, And a bus electrode formed on the intermediate electrode.