KR100625572B1 - Plasma Display Panel - Google Patents

Abstract

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel in which an electrode structure is improved by using a positive column region during plasma discharge.

According to an embodiment of the present invention, a front substrate on which a scan electrode and a sustain electrode are formed, a back substrate on which an address electrode arranged to intersect the scan electrode and the sustain electrode are formed, and a positive column region during plasma discharge are used on the back substrate. In the plasma display panel comprising a partition wall for partitioning the discharge cells so that,

The scan electrode and the sustain electrode are each made of a bus electrode,

The bus electrode is located along the partition wall and the upper discharge ignition and lower discharge ignition to cause an initial discharge,

An upper discharge spreader and a lower discharge diffuser which generate light in a positive column region within the discharge cell by using initial discharge generated by the upper discharge ignition unit and the lower discharge ignition unit and diffuse the light into the entire discharge cell. It is characterized by including.

Positive column, discharge ignition unit, discharge diffusion unit, initial discharge, discharge gap

Description

Plasma Display Panel

1 is a perspective view schematically showing the structure of a conventional PDP.

2 is a plan view of a discharge cell having a conventional fence-type electrode structure;

3 is a view for explaining a discharge region between electrodes.

4 is a plan view of a discharge cell having a fence-type electrode structure according to the present invention.

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

420 and 440: bus electrodes 420a and 440a: discharge ignition unit

420a ₁ , 440a ₁ : first protrusion 420a ₂ , 440a ₂ : second protrusion

420b, 440b: discharge diffusion unit 420b ₁ , 440b ₁ : all parts of the kitchen

420b ₂ , 440b ₂ : secondary discharge unit 420b ₃ : connection discharge unit

420b and 440b: discharge diffusion unit 430 partition wall

450a, 450b: discharge gap 460: discharge cell

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel in which an electrode structure is improved by using a positive column region during plasma discharge.

In general, a plasma display panel (hereinafter, referred to as a PDP) has a partition wall formed between a front substrate and a rear substrate of soda-lime glass and constitutes one unit cell. When an inert gas such as helium-xenon (He-Xe) or helium-neon (He-Ne) is discharged by a high frequency voltage, vacuum ultraviolet rays are generated to emit phosphors formed between the partition walls. It is a device to implement.

1 is a perspective view schematically showing the structure of a conventional PDP. As shown in the figure, the PDP 100 is coupled in parallel with the front substrate 10, which is a display surface on which an image is displayed, and the rear substrate 20, which forms a rear surface, with a predetermined distance therebetween.

The front substrate 10 is made of a metal material and sustain electrodes 11 and 12 for maintaining light emission of cells by mutual discharge in one pixel below, that is, transparent electrodes 11a and 12a formed of a transparent ITO material. The sustain electrodes 11 and 12 provided as the bus electrodes 11b and 12b are formed in pairs. The sustain electrode pair includes a scan electrode 11 and a sustain electrode 12. The scan electrode 11 is mainly supplied with a scan signal for scanning a panel and a sustain signal for sustaining discharge, and the sustain electrode 12 ) Is mainly supplied with a holding signal. The sustain electrodes 11 and 12 are covered by a dielectric layer 13a that limits a discharge current and insulates electrode pairs, and deposits magnesium oxide (MgO) on the top surface of the dielectric layer 13a to facilitate discharge conditions. One protective layer 14 is formed.

In the rear substrate 20, a plurality of discharge spaces, that is, stripe-type (or well-type) partition walls 21 for forming cells are arranged in parallel with each other and address discharge is performed at an intersection with the sustain electrode 11. A plurality of address electrodes 22, which are performed to generate vacuum ultraviolet rays, are disposed in parallel with the partition wall 21. In addition, a dielectric layer 13b is formed on an upper surface of the address electrode 22, and an R, G, and B fluorescent layer 23 that emits visible light for displaying an image upon address discharge is coated on the upper surface of the dielectric layer.

Since such a general plasma display panel includes an expensive transparent electrode, a manufacturing cost increases. In order to solve this problem, a fence type electrode structure without using a transparent electrode has been proposed.

2 is a plan view of a discharge cell having a conventional fence type electrode structure. As shown in FIG. 2, the discharge cell 210 having a fence type electrode structure does not form an expensive transparent electrode on a front substrate (not shown), and includes an upper discharge diffusion unit 220 formed of only a bus electrode. And a lower discharge spreader 240 are formed, and a partition wall 230 for partitioning the discharge cells 210 is formed on a rear substrate (not shown).

In this case, the upper discharge spreader 220 and the lower discharge spreader 240 are provided with three discharge units 220a and 240a and two connection discharge units 220b and 240b, respectively. ) And a discharge gap 250 formed between the lower discharge spreader 240 and the connection discharges 220b and 240b to diffuse the discharge. In other words, since the transparent electrode having a large effective area with the discharge space is not formed, the upper discharge spreader 220 and the lower discharge diffuser 240 are formed to compensate for the effective area with the discharge space.

However, the discharge cell of the fence type electrode structure has a problem that the opacity of the upper discharge diffusion portion and the lower discharge diffusion portion occupies a large area in the discharge space in the discharge cell, thereby reducing the aperture ratio during discharge. In addition, since the effective area is formed narrower than that of the transparent electrode, there is a limit in efficiently discharging the discharge.

As a result, the luminance decreases and the discharge start voltage for starting the discharge increases during driving, thereby causing a problem of low discharge efficiency. In addition, since the distance d between the upper discharge spreader and the lower discharge spreader is too small in the discharge cell, only the negative glow area of the discharge area is used during the driving. Here, the discharge region described above will be described with reference to FIG. 3.

3 is a diagram for explaining a discharge region between electrodes.

In FIG. 3, when voltage is applied to the cathode and the anode, the secondary electrons generated and emitted by the cathode collision of the ions are accelerated by the electric field and collide with the neutral particles to generate new electrons. Will be generated. Secondary electrons are accelerated more strongly in the negative glow region where the magnitude of the electric field is larger as the voltage changes. The electrons generated as a collision continue to obtain energy in the state of ionization, and reach the positive column region. In the positive region, energy is no longer obtained, and energy is transmitted to the neutral particles through the collision. In this process, the excited particles fall to the ground and generate visible and vacuum ultraviolet rays.

Of these discharge areas, the positive light main region emits light by exciting gas only with electrons having high energy in the whole, not energy due to an electric field. In addition, in the positive light main region, ionization hardly occurs and a lot of light emission due to excitation is generated, so that energy is converted into light as a whole.

Accordingly, if the distance between the upper discharge diffuser and the lower discharge diffuser is reduced in the discharge cell of the plasma display panel, the size of the sub glow region is not largely changed while the size of the positive light region is relatively reduced. Therefore, a problem arises in that the light emission luminance of the plasma display panel is lowered.

In order to solve the above problems, the present invention provides a plasma display panel which can improve the discharge efficiency and light emission luminance and lower the discharge start voltage by using the positive light main region and the improved electrode structure when discharging the plasma display panel. It aims to do it.

Plasma display panel of the present invention for solving the above technical problem is a front substrate formed with a scan electrode and a sustain electrode, a rear substrate formed with an address electrode arranged to cross the scan electrode and the sustain electrode, and the rear substrate In a plasma display panel including a partition partitioning a discharge cell to use a positive column area during plasma discharge, the scan electrode and the sustain electrode are each made of a bus electrode, and the bus electrode is formed along the partition wall. The light is discharged in the discharge cell by using the initial discharge generated in the upper discharge ignition portion and the lower discharge ignition portion, the upper discharge ignition portion and the lower discharge ignition portion which are positioned to cause the initial discharge, and diffused into the entire discharge cell. Characterized in that it comprises an upper discharge spreader and a lower discharge spreader do.

In addition, the upper discharge ignition unit and the lower discharge ignition unit is characterized in that it comprises a first protrusion and a second protrusion protruding to the left and right from the end point located along the partition wall.

In addition, the interval between the upper discharge ignition unit and the lower discharge ignition unit is characterized in that 10 ㎛ ~ 100 ㎛.

In addition, the upper discharge spreader and the lower discharge spreader is characterized in that it comprises a kitchen unit and an auxiliary discharge unit, respectively.

The auxiliary discharge unit may include a first auxiliary discharge unit and a second auxiliary discharge unit, and the kitchen discharge unit may have a longer length than the auxiliary discharge unit and further include a connection discharge unit connecting the auxiliary discharge unit to the kitchen discharge unit.

In addition, the interval between the upper discharge diffusion and the lower discharge diffusion is characterized in that 140 ㎛ ~ 300 ㎛.

In addition, the discharge cell is characterized in that the fence structure (Fence) structure.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

4 is a plan view of a discharge cell having a fence-type electrode structure according to the present invention. First, as shown in FIG. 4, in the plasma display panel according to the present invention, a scan electrode 420 and a sustain electrode 440 are formed on a front substrate (not shown), and the scan electrode 420 and the sustain electrode 420 are formed. A barrier rib 430 is formed on the rear substrate (not shown) formed by crossing the electrodes to partition the discharge cells 460 so that a positive column region can be used during plasma discharge. .

In this case, forming each of the scan electrode 420 and the sustain electrode 440 only as a bus electrode without forming a transparent electrode replaces an expensive transparent electrode to form a bus electrode having a relatively narrow area in a discharge space. It is possible to replace the role of the transparent electrode by changing the design to reduce the manufacturing cost consumed when forming the scan electrode and the sustain electrode, and to obtain the same effect as the transparent electrode by the structural design of the bus electrode.

Here, the bus electrodes 420 and 440 are positioned along the partition wall 430 partitioning the discharge cells 460, using the upper discharge ignition portion 420a and the lower discharge ignition portion 440a and the initial discharge to cause initial discharge. An upper discharge spreader 420b and a lower discharge diffuser 440b which generate light in a positive column region in the discharge cell 460 and diffuse the light into the entire discharge cell 460 are provided.

At this time, the upper discharge ignition portion 420a and the lower discharge ignition portion 440a are the first protrusions 420a ₁ , 440a ₁ and the second protrusions protruding left and right from the end points positioned along the partition wall 430. 420a ₂ , 440a ₂ ), which are formed along the partition wall 430 to minimize the opening ratio during discharge and minimize the first protrusions 420a ₁ , 440a ₁ and the second protrusions 420a ₂ , 440a ₂ . Protrudes into the discharge cell 460 to provide an initial discharge to assist in spreading the discharge to reduce the discharge start voltage. On the other hand, it is possible to design a gap d ₁ between the upper discharge ignition portion 420a and the lower discharge ignition portion 440a from 10 μm to 100 μm, but in general, the discharge gap at a distance d ₁ of 40 μm. It is preferable to form 450a.

The initial discharge generated by the upper discharge ignition unit 420a and the lower discharge ignition unit 440a generates light in the positive column region in the discharge cell 460 to the entire discharge cell 460. to the upper discharge diffusion portion (420b) and a lower discharge diffusion unit (440b) to spread it is provided with a respective kitchen all (420b _1, 440b ₁₎ and the auxiliary discharger (420b _2, 440b _2), wherein all of the auxiliary room (420b ₂ , 440b ₂ ) includes a first auxiliary discharge unit 420b ₂ ′ and 440b ₂ ′ and a second auxiliary discharge unit 420b ₂ ″ and 440b ₂ ″ for spreading the discharge. In addition, kitchen whole length (L ₁₎ is an auxiliary discharge portion (420b _2, 440b ₂₎ the length (L ₂₎ all being formed longer than the kitchen (420b _1, 440b ₁₎ of the auxiliary room (420b _1, 440b ₁₎ Connection discharge portion 420b ₃ is further provided to connect all of the portions 420b ₂ and 440b ₂ to further facilitate dispersing of the discharge, thereby increasing discharge efficiency and improving luminance.

On the other hand, it is possible to design a gap (d ₂ ) between the upper discharge diffusion 420b and the lower discharge diffusion unit 440b up to 140 ㎛ ~ 300 ㎛, but in general, the discharge gap in the interval (d ₂ ) of 200 ㎛ It is preferable to form 450b.

In addition, the discharge cells 460 discharged by the discharge diffusion parts 420b and 440b and the discharge ignition parts 420a and 440a may be applied to all types of discharge cell structures, but are generally applied to a fence type structure. It is desirable to be.

As described above, the discharge ignition portion is formed to cause the initial discharge protruding left and right from the end point located along the partition wall to lower the discharge start voltage while minimizing the opening ratio, and the discharge diffusion portion is generated by the discharge ignition portion. The initial discharge is used to generate light in a positive column region in the discharge cell and to diffuse the light into the entire discharge cell, thereby increasing the overall discharge efficiency and improving the luminous luminance.

Those skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the detailed description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

As described above, the present invention has the effect of increasing the discharge efficiency and improving the luminance by discharging using the positive columnar region at the time of discharge of the plasma display panel.

In addition, the present invention has the effect of reducing the manufacturing cost, increasing the aperture ratio and lowering the discharge start voltage by forming an improved bus electrode in consideration of the characteristics of the positive light column region.

Claims (7)

A front substrate on which a scan electrode and a sustain electrode are formed, a back substrate on which an address electrode arranged to intersect the scan electrode and the sustain electrode is formed, and a discharge to use a positive column region during plasma discharge on the back substrate A plasma display panel comprising partition walls for partitioning a cell, comprising: The scan electrode and the sustain electrode are each made of a bus electrode, The bus electrode is located along the partition wall and the upper discharge ignition and lower discharge ignition to cause an initial discharge, An upper discharge spreader and a lower discharge diffuser which generate light in a positive column region within the discharge cell by using initial discharge generated by the upper discharge ignition unit and the lower discharge ignition unit and diffuse the light into the entire discharge cell. Plasma display panel characterized in that it comprises. The method of claim 1, And the upper discharge ignition portion and the lower discharge ignition portion include first and second protrusions protruding left and right from end points positioned along the partition wall. The method of claim 1, And a distance between the upper discharge ignition unit and the lower discharge ignition unit is 10 μm or more to 100 μm or less. The method of claim 1, And the upper discharge spreader and the lower discharge spreader each include a kitchen unit and an auxiliary discharge unit. The method of claim 4, wherein The auxiliary discharge unit includes a first secondary discharge unit and a second secondary discharge unit, The discharging unit has a length longer than that of the auxiliary discharging unit, and further comprising a connection discharging unit connecting the discharging unit to the discharging unit. The method of claim 1, The interval between the upper discharge spreader and the lower discharge spreader is Plasma display panel, characterized in that from 140 ㎛ or more to 300 ㎛ or less. The method of claim 1, The discharge cell is a plasma display panel, characterized in that the fence (Fence) structure.

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