KR20050108560A - Plasma display panel - Google Patents

Abstract

SUMMARY OF THE INVENTION The present invention provides a plasma display panel which enables address discharge at a low voltage and reduces power consumption while improving light emission efficiency and heat radiation efficiency of the plasma display panel.

A plasma display panel according to the present invention includes: a first substrate and a second substrate disposed to face each other; Barrier ribs disposed in a space between the first substrate and the second substrate to partition a plurality of discharge cells; And a phosphor layer formed in each of the discharge cells, wherein the first substrate includes address electrodes and discharge sustain electrodes extending in a direction crossing the address electrodes, and the second substrate is made of metal. Is formed.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

The present invention relates to a plasma display panel (PDP) for displaying an image.

In general, PDP uses an image of red (R), green (G), and blue (B) visible light generated by vacuum ultraviolet (VUV: Vacuum Ultra-Violet) emitted from a plasma obtained by gas discharge to excite the phosphor. It is a display element to implement. The PDP can realize an ultra-large screen of 60 inches or more with a thickness of less than 10 cm, and is a self-luminous display device such as a CRT. It is gaining attention as a TV and industrial flat panel display that have strengths in terms of productivity and cost.

In a typical AC PDP, address electrodes are formed in one direction on a rear substrate, and a dielectric layer is formed on the front surface of the rear substrate while covering the address electrodes. Stripe-shaped barrier ribs are formed on the dielectric layer between the address electrodes, and phosphor layers of red (R), green (G), and blue (B) colors are formed between the barrier ribs.

Discharge sustaining electrodes comprising a pair of transparent electrodes and a bus electrode are formed on one surface of the front substrate opposite to the rear substrate, covering the discharge sustaining electrodes and covering the entire front substrate. The dielectric layer and the MgO protective film are formed in turn.

The point where the address electrodes on the rear substrate and the pair of discharge sustaining electrodes on the front substrate cross each other constitutes a discharge cell.

In the PDP configured as described above, millions of unit discharge cells are arranged in a matrix form. In order to simultaneously drive the discharge cells of the AC PDP arranged in a matrix form, driving using the memory characteristic is performed.

In more detail, in order to generate a discharge between the X electrode (display electrode) and the Y electrode (scanning electrode) constituting a pair of discharge sustaining electrodes, a potential difference of a specific voltage or more is required, and the voltage at this boundary is the discharge start voltage. It is called (Vf: Firing Voltage). At this time, when the address voltage is applied between the Y electrode and the address electrode, the discharge starts to form a plasma in the discharge cell, and the electrons and ions in the plasma move toward the electrode having the opposite polarity, so that a current flows.

On the other hand, a dielectric layer is applied to each electrode of the AC PDP so that most of the transferred space charges are accumulated on the dielectric layer having the opposite polarity, so that the net space potential between the Y electrode and the address electrode is changed from the originally applied address voltage ( Smaller than Va), the discharge becomes weak and the address discharge disappears. At this time, a relatively small amount of electrons are accumulated in the X electrode, and a relatively large amount of ions are accumulated in the Y electrode, and charges accumulated on the dielectric layers covering the X electrode and the Y electrode are wall charged (Qw). The space voltage formed between the XY electrodes by these wall charges is referred to as wall voltage (Vw).

Subsequently, when a constant voltage (Vs: discharge holding voltage) is applied between the X electrode and the Y electrode, the sum of the magnitudes of the discharge holding voltage Vs and the wall voltage Vw (Vs + Vw) is the discharge starting voltage. When it is higher than Vf, discharge occurs in the discharge cell, and the vacuum ultraviolet light (VUV) generated at this time excites the corresponding phosphor and emits visible light through the transparent front substrate.

However, when there is no address discharge between the Y electrode and the address electrode (that is, when no address voltage Va is applied), there is no wall charge accumulated between the XY electrodes, and as a result, there is no wall voltage between the XY electrodes. . At this time, only the discharge holding voltage Vs applied between the X-Y electrodes is formed in the discharge cell, which is lower than the discharge start voltage Vf, so that the gas space between the X-Y electrodes is not discharged.

The PDP driven in this way goes through several steps from the input power to the final visible light. As a result, the energy conversion efficiency in each process is not good. As a result, the efficiency (ratio of luminance to power consumption) indicated by the current PDP is It is lower than CRT. For this reason, PDP has a problem of excessive power consumption.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a plasma display panel which improves luminous efficiency and heat dissipation efficiency of a plasma display panel while reducing power consumption by enabling address discharge at a low voltage. It is.

Plasma display panel according to the present invention,

A first substrate and a second substrate disposed to face each other;

Barrier ribs disposed in a space between the first substrate and the second substrate to partition a plurality of discharge cells; And

A phosphor layer formed in each of the discharge cells,

The first substrate includes address electrodes and discharge sustain electrodes extending in a direction crossing the address electrodes,

The second substrate is formed of metal.

The second substrate is preferably formed of Ti.

The second substrate is formed of a material having a purity of 99% or more and a thermal conductivity of 24.5 to 22 at an absolute temperature of 200 to 1200K.

The second substrate may be formed integrally or separately with the partition wall.

The barrier rib is formed of metal, and preferably formed of Ti.

The partition wall is formed of a material having a purity of 99% or more and an absolute temperature coefficient of 24.5 to 22 at an absolute temperature of 200 to 1200K.

On the first substrate side between the address electrode and the discharge sustaining electrode side corresponding to the address electrode, an address discharge groove is formed to form an address discharge gap, which is directed from the first substrate to the second substrate. It may be formed in an open or rectangular shape, and may be formed to be biased toward one side from the upper center of the discharge cell or the upper center of the discharge cell.

The address electrodes are formed in the direction in which the barrier ribs extend in a direction opposite to the barrier ribs perpendicular to the discharge sustain electrodes.

The address electrodes have branches extending to the discharge sustaining electrode side. The address electrodes may include protrusions protruding toward the discharge sustaining electrode.

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

1 is a partial cross-sectional exploded perspective view schematically showing a first embodiment of a plasma display panel according to the present invention.

Referring to the PDP, the PDP according to the first embodiment seals the first substrate 1 and the second substrate 3 to face each other, and between the first and second substrates 1 and 3. It is formed by filling an inert gas into it. A plurality of discharge cells 7R, 7G, and 7B formed of the partition walls 5 disposed between the first and second substrates 1 and 3 are coated with red (R), green (G), and blue ( B) The phosphor layers 9R, 9G and 9B made of colored phosphors are formed.

A plurality of address electrodes 11 are formed on the first substrate 1 in the Y direction of the drawing, and the plurality of discharge sustaining electrodes are formed in a direction crossing the address electrodes 11, that is, in the X direction of the drawing. (13, 15) are extended.

The barrier ribs 5 provided in the space between the first substrate 1 and the second substrate 3 are disposed in parallel with the other barrier ribs 5 adjacent to each other to discharge cells 7R and 7G required for plasma discharge. , 7B).

In the present embodiment, the structure of the stripe-shaped partition wall 5 is described as an example, but the present invention is not limited thereto, and the partition member 5 corresponding to the partition electrodes 5 and the address electrodes 11 are parallel to the address electrodes 11. It can also be applied to a closed partition structure for closing and partitioning a discharge cell (not shown) by a partition member (not shown) intersecting with.

On the other hand, the address electrodes 11 are covered with the first dielectric layer 17 to form wall charges in the discharge cells 7R, 7G, and 7B to cause address discharge. The first dielectric layer 17 is preferably formed of a transparent dielectric to ensure transmittance of visible light.

The discharge sustain electrodes 13 and 15 cause the address discharge with the address electrode 11 and then face each other so as to cause sustain discharge in the discharge cells 7R, 7G, and 7B. 15). Each of the X electrode 13 and the Y electrode 15 is composed of transparent electrodes 13a and 15a protruding toward the discharge cells 7R, 7G and 7B and bus electrodes 13b and 15b for supplying current thereto.

Here, the transparent electrodes 13a and 15a play a role of causing plasma discharge in the discharge cells 7R, 7G, and 7B, and thus, transparent indium tin oxide (ITO) electrodes are preferably used to secure luminance. The electrodes 13b and 15b preferably use metal electrodes to compensate for the high resistance of the transparent electrodes 13a and 15a and to secure electrical conductivity.

The discharge sustaining electrodes 13 and 15, i.e., the X and Y electrodes 13 and 15 are formed in pairs to face each other, so that a pair of pairs corresponding to the respective discharge cells 7R, 7G, and 7B can be obtained. The bus electrodes 13b and 15b are formed in parallel with each other in a straight line, and the transparent electrodes 13a and 15a protrude inwards toward the respective discharge cells 7R, 7G and 7B from the respective bus electrodes 13b and 15b. The address electrodes 11 face in the extending direction, that is, the Y axis direction. The discharge sustain electrodes 13 and 15 are covered with the second dielectric layer 19 and the MgO protective film 21. The first and second dielectric layers 17 and 19 are preferably formed of the same kind of transparent dielectric so that visible light is transmitted without distortion.

FIG. 2 is a partial cross-sectional view taken along the line A-A of FIG. 1, and FIG. 3 is a partial cross-sectional view taken along the line B-B of FIG.

Referring to these drawings, the stack structure of the address electrode 11, the X electrode 13, and the Y electrode 15 will be described. The address electrode 11 has a Y-axis direction on the inner surface of the first substrate 1; And the transparent electrodes 13a and 15a which are elongated and covered by the first dielectric layer 17 and disposed on the first dielectric layer 17 in an opposite structure to each other, that is, the X axis Direction, the bus electrodes 13b and 15b are disposed in the X-axis direction on the transparent electrodes 13a and 15a, and the transparent electrodes 13a and 15a and the bus electrodes 13b and 15b are arranged in the second direction. The structure is covered with a dielectric layer 19, and the second dielectric layer 19 is covered with an MgO protective film 21.

Since address discharge is generated between the address electrode 11 and the transparent electrode 15a of the Y electrode 15 arranged as described above, for this purpose, an address forming an address discharge gap (gap, g) is formed on the first substrate 1 side. Discharge grooves 23 are provided. The address discharge groove 23 is for address discharge generated between the address electrode 11 and the Y electrode 15, and is preferably formed adjacent to the Y electrode 15 of the discharge sustain electrode. As the address electrode 11 is provided on the first substrate 1 together with the Y electrode 15 to be adjacent to each other in this way, the address voltage required for address discharge can be lowered, thereby reducing power consumption of the PDP. It becomes possible.

The address discharge grooves 23 acting as described above may be formed in various structures, and open toward the second substrate 3 from the first substrate 1, that is, toward the discharge cells 7R, 7G, and 7B. It has an open structure, and its longitudinal section may be formed in a square or round shape. The square shape enlarges the address discharge space with respect to the opening in the address discharge grooves 23 of the same size, and the round type facilitates the formation of the MgO protective film 21 in the address discharge groove 23 as compared with the square shape.

In addition, the address discharge grooves 23 can be formed at various positions adjacent to the Y electrodes 15 according to the arrangement of the transparent electrodes 13a and 15b and the address electrodes 11, and the respective discharge cells 7R, It may be formed to be biased toward one side in the upper center of 7G, 7B or in the center of each discharge cell 7R, 7G, 7B.

4 is a partial plan view of FIG. 1. Referring to this drawing, in forming the stacked structure as described above on the first substrate 1, the address electrodes 11 extend in the extending direction (Y axis) of the discharge sustaining electrodes, that is, the X and Y electrodes 13 and 15. Facing the partitions 5 in the direction orthogonal to the direction (X-axis direction), respectively, and are formed in the extending direction of these partitions 5. The address electrode 11 is provided at a position corresponding to the partition wall 5 which is the non-discharge region, thereby preventing the luminance from being reduced.

The address electrodes 11 may simply be formed in a stripe shape on the first substrate 1 along a position corresponding to the partition wall 5, but may further include a branch 11a extending therefrom. The branch 11a is preferably formed to extend from the address electrode 11 to the discharge sustain electrodes 13 and 15 in the perpendicular direction.

The branch 11a is for reducing the address discharge voltage, and is preferably formed to extend to the side adjacent to the Y electrode 15 which acts upon the address discharge among the discharge sustain electrodes 13 and 15. In FIG. 4, the branch 11a is elongated between the X and Y electrodes 13 and 15 facing each other, that is, adjacent to the Y electrode 15. In more detail, the branch 11a extends between the transparent electrodes 13a and 15a on the X and Y electrodes 13 and 15 side, that is, adjacent to the transparent electrode 15a of the Y electrode 15.

This branch 11a is opposed to the transparent electrode 15a of the discharge cell 7R, 7G, 7B on the Y electrode 15 side of the discharge cell 7R, 7G, 7B without causing an erroneous discharge. It is preferable to extend to a length of 1/2 or more of the inner distance Lb of each discharge cell 7R, 7G, and 7B so as to increase. As the range in which the branch 11a and the transparent electrode 15a oppose each other increases, an effective address discharge can occur between the address electrode 11 and the Y electrode 15.

Since the branch 11a is formed above the center of the discharge cells 7R, 7G, and 7B, the address discharge groove 23 in which the address discharge occurs is preferably formed in the center above the discharge cells 7R, 7G, and 7B. (See FIG. 4).

In addition, when the branch 11a is not formed in the address electrode 11, the address discharge groove 23 is preferably provided. When the branch 11a is formed as shown in the drawing, the address discharge groove 23 is formed. It is not necessary to have a. In the case where the branch 11a is not present, it is preferable to arrange the address electrode 11 closer to the discharge cells 7R, 7G, and 7B than in the case where the branch 11a is present.

5 is a partial plan view of a second embodiment of a plasma display panel according to the present invention, and FIG. 6 is a partial cross-sectional view taken along the line C-C of FIG.

The second embodiment will be described with reference to these drawings. Since the second embodiment is similar in overall configuration and effect to the first embodiment, a different part from the first embodiment will be mainly described here.

In this second embodiment, the address electrode 11 has a protrusion 11b, and has a structure corresponding to the discharge sustaining electrodes, that is, the X and Y electrodes 13 and 15 and their transparent electrodes 13a and 15a. And an address discharge groove 23.

In other words, the protruding portion 11b is formed in the address electrode 11 to protrude toward the Y electrode 15 side to form an address discharge gap g short with the Y electrode 15 causing the address discharge. In addition, the address discharge groove 23 is formed in a round shape between the Y electrode 15 and the address electrode 11 and the protruding portion 11b thereof at a position biased to one side from the upper center of the discharge cells 7R, 7G, and 7B. (See FIG. 6).

In this way, the address electrode 11 formed on the first substrate 1 shortens the discharge distance from the Y electrode 15. In addition, the address electrode 11 includes a branch 11a and a protrusion 11b. The address discharge voltage can be reduced by further shortening the discharge distance from the Y electrode 15.

On the other hand, in the first substrate 1 configured as described above, the vacuum ultraviolet rays generated by the plasma discharge in the discharge cells 7R, 7G, and 7B have the phosphors 9R, 9G, and 9B in the discharge cells 7R, 7G, and 7B. It is formed of a transparent material so as to transmit visible light of red (R), green (G), blue (B) color generated by the excitation), and is preferably formed of glass as usual.

The second substrate 3 encapsulated in the first substrate 1 is reflected so as not to transmit visible light Vr like the first substrate 1 (see FIGS. 2, 3, and 6). It may be formed of a material other than a transparent material such as the substrate 1, and preferably formed of a material capable of effectively reflecting the visible light Vr toward the first substrate 1.

That is, the second substrate 3 may be formed of a metal that is an opaque material. The second substrate 3 formed of this metal has visible light (Vr) of red (R), green (G), and blue (B) colors generated in the discharge cells 7R, 7G, and 7B. By reflecting toward the (1) side, the luminous efficiency is improved, and due to the excellent thermal conductivity, the heat generated in the PDP is effectively released. One example of such a metal is titanium (Ti).

The second substrate 3 is exposed to heat load such as receiving heat from the outside during the PDP firing process in a state of being bonded to the first substrate 1, and receiving heat from the inside of the PDP while driving the PDP. In spite of this heat load, the second substrate 3 should be able to be firmly held in the state of being bonded to the first substrate 1 so as to be driven without deforming the PDP. That is, it is preferable that the second substrate 3 satisfying these conditions is formed of a material having a purity of 99% or more and a thermal conductivity coefficient of 24.5 to 22 at an absolute temperature of 200 to 1200K.

The second substrate 3 may be formed integrally with the partition 5 or may be formed separately. In the drawings of the present embodiment, the second substrate 3 and the partition wall 5 are separately formed.

When the second substrate 3 is made of metal, the partition wall 5 is preferably formed integrally with the same metal. In this case, the second substrate 3 and the partition wall 5 can be formed simultaneously. The manufacturability of the 2nd board | substrate 3 and the partition 5 can be improved. Of course, even if the second substrate 3 is formed of metal, the partition wall 5 may be formed of a material of the second substrate 3, that is, a metal or Ti, which is an example of a metal, or may be formed of a material different from that of the second substrate 3. It may be.

Since the partition wall 5 is provided in the space between the first and second substrates 1 and 3, the purity is not less than 99% and the absolute temperature is 200 so as not to be deformed by the heat load received by the second substrate 3 and the PDP as described above. It is preferable to be formed of a material having a thermal conductivity of 24.5 to 22 at -1200K.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

As described above, according to the plasma display panel according to the present invention, by forming the X electrode and the Y electrode of the address electrodes and the discharge sustaining electrodes together on the first substrate, the discharge distance between the address electrode and the Y electrode is shortened, and thus the low voltage is reduced. By using the address discharge, the power consumption of the PDP can be reduced, and the first substrate is formed of glass and the second substrate is formed of metal to reflect visible light by plasma discharge toward the first substrate, thereby improving luminous efficiency. The heat dissipation efficiency of the PDP is improved through heat dissipation of the PDP through the second substrate.

1 is a partial cross-sectional exploded perspective view schematically showing a first embodiment of a plasma display panel according to the present invention.

2 is a partial cross-sectional view taken along the line A-A of FIG.

3 is a partial cross-sectional view taken along the line B-B of FIG.

4 is a partial plan view of FIG. 1.

5 is a partial plan view of a second embodiment of a plasma display panel according to the present invention.

6 is a partial cross-sectional view taken along the line C-C of FIG.

Claims (10)

A first substrate and a second substrate disposed to face each other; Barrier ribs disposed in a space between the first substrate and the second substrate to partition a plurality of discharge cells; And A phosphor layer formed in each of the discharge cells, The first substrate includes address electrodes and discharge sustain electrodes extending in a direction crossing the address electrodes, And the second substrate is formed of metal. The method of claim 1, And the second substrate is formed of Ti. The method of claim 1, And the second substrate is formed of a material having a purity of 99% or more and a thermal conductivity of 24.5 to 22 at an absolute temperature of 200 to 1200K. The method of claim 1, The second substrate is a plasma display panel formed integrally or separate from the partition wall. The method of claim 1, And the partition wall is formed of a metal. The method of claim 1, And the barrier rib is formed of Ti. The method of claim 1, The partition wall is formed of a material having a purity of 99% or more and a thermal conductivity of 24.5 to 22 at an absolute temperature of 200 to 1200K. The method of claim 1, And an address discharge groove forming an address discharge gap on the first substrate side between the address electrode and the discharge sustain electrode side corresponding to the address electrode. The method of claim 1, And the address electrodes have branches extending toward the discharge sustaining electrode. The method of claim 1,  And the address electrodes include protrusions protruding toward the discharge sustaining electrode.