CN201097397Y - A magnetized plasma display - Google Patents

Abstract

The utility model adopts a magnetized plasma display, which is characterized in that in each discharge unit, the magnetized electrode arranged on the inner surface of the barrier wall is connected to an AC or DC power supply capable of generating a current greater than 0.1A; the sustain electrodes in each discharge unit, The addressing electrodes are respectively connected to an AC or DC power source capable of generating a voltage above 3 volts; the barrier is made of glass doped with metal oxide or metal powder; The current of 0.1A magnetizes the working gas in the discharge space; while the sustaining electrode produces a sustaining discharge, continue to apply a current of not less than 0.1A to the magnetized electrode for magnetization; thus the breakdown voltage can be reduced and the sustaining rate can be improved. Discharge stability and efficiency, and can improve luminous efficiency to a certain extent, reduce energy consumption and increase brightness.

Description

A Plasma Display Using Magnetization

Technical field:

The utility model belongs to the technical field of plasma displays, in particular to a plasma display which uses a magnetic field generated by an electric current to magnetize plasma.

Background technique:

According to "Electronic Display" (Tian Minbo, pages 117-128) published by Tsinghua University Press in 2001, although existing plasma displays have many different structures, the mechanism of their discharge light emission is the same, mainly by the following It consists of two basic processes:

1. Gas discharge process, that is, the inert gas generates discharge under the action of an external electrical signal, so that the atoms are excited and transition, and emit vacuum ultraviolet rays;

2. The luminescence process of the phosphor powder, that is, the process in which the ultraviolet rays generated by the gas discharge excite the photophosphor powder to emit visible light.

Plasma display is an active light-emitting display. The current technology is to emit light through glow discharge. Under a certain pressure, once discharge occurs, its luminous brightness can be controlled by controlling the electrode voltage and adjusting the length of effective discharge time. The brightness of a color plasma display is related to the intensity of vacuum ultraviolet rays generated during gas discharge and the breakdown voltage. In the prior art, the breakdown voltage of the gas discharge is relatively high, so that the currently used drive circuit has low plasma generation efficiency, and the vacuum ultraviolet light intensity is relatively weak, resulting in insufficient luminance of the display.

The plasma discharge method introduced in Chinese Patent No. 200410078947.0 and the display based on this method have complex structures and high manufacturing process requirements; in particular, this method still only uses DC glow discharge, so the breakdown voltage cannot be fundamentally reduced.

Utility model content:

The utility model proposes a plasma display using magnetization to change the dependence on voltage in the way of generating plasma in the prior art, so as to improve discharge efficiency, reduce breakdown voltage, reduce energy consumption and increase brightness.

The utility model adopts a magnetized plasma display, which is composed of no less than three independent discharge units with the same structure in parallel; each discharge unit is a front substrate and a rear substrate made of transparent materials parallel to each other and four perpendicular to them. The cubic structure formed by the barrier is filled with a working gas of 100-1000 pascals, which is composed of an inert gas with a volume percentage of 10%-99% and other gases including nitrogen, mercury vapor, methane or hydrogen. ; The inner surface of the front substrate uses a transparent conductive material layer as a sustain electrode, and a conductive layer is used as an address electrode on the inner surface of the rear substrate opposite to the sustain electrode; the inner surface of the discharge cell is covered with a fluorescent material layer; It is characterized in that magnetized electrodes made of conductive materials are respectively or simultaneously provided on the barrier walls of each discharge cell or on the inner surfaces of the front and rear substrates, and are connected to any electrode in an AC or DC power supply capable of generating a current of 0.1 to 50A The sustain electrodes and address electrodes in each discharge cell are respectively connected in parallel to the two poles of an AC or DC power supply capable of generating a voltage of 3-380 volts; the barrier ribs are doped with 0.1%-10% by volume of metal oxide or Made of metal powdered glass.

The barrier ribs are generally 20-100 microns wide and 100-400 microns thick.

The working gas filled in the discharge cell is usually selected from a mixture of 80% to 95% by volume of inert gas and 5% to 20% of other gases. The inert gas includes helium, argon or neon. Other gases include nitrogen, mercury vapor, methane or hydrogen.

The fluorescent material refers to a material that will ionize visible light when it is irradiated by ultraviolet rays, including barium with europium as the luminescence center, magnesium aluminate (BaMgAlO:Eu) powder, silicate (ZnSiO ₄ ) with manganese as the luminescence center :Mn) or borates of yttrium and gadolinium with europium as the luminescence center ((Y, Gd)BO ₃ :Eu).

The transparent conductive material used as the sustain electrode may be an indium tin oxide (ITO) film, tin oxide film, silver foil, nickel foil or aluminum foil with a thickness of 1 nanometer to 1 millimeter.

The addressing electrode material can be selected from silver foil, nickel foil or aluminum foil with a thickness of 0.01-2 mm.

The magnetized electrode material may be silver wire, copper wire or aluminum wire with a diameter of 0.01-10 microns.

In order to protect the electrodes, a layer of dielectric with a dielectric constant of 1-10 and a thickness of 0.001-1 mm can be evenly covered on the surface of the electrodes as a protective layer; the dielectric can be magnesium oxide, ruthenium oxide or gallium fluoride.

When working, according to the selected working gas, the breakdown discharge is realized by applying the corresponding voltage to the sustain electrode and the address electrode corresponding to the sustain electrode; after the breakdown discharge, the sustain electrode continues the corresponding voltage for sustain discharge; Before the piercing discharge, a current of 0.1-50A is applied to the magnetized electrode to generate a magnetic field in the discharge space; while the sustain electrode generates a sustain discharge, a current of 0.1-50A is continuously applied to the magnetized electrode to maintain the magnetic field.

Depending on the selected working gas, the breakdown voltage applied to the sustain electrode and the address electrode corresponding to the sustain electrode can range from tens of volts to several thousand volts, usually 30-5000 volts; for example: for 300 Pascal The breakdown voltage of a mixture of 95% helium and 5% mercury vapor is about 70 volts; for a mixture of 90% argon and 10% SF4 at 150 pascals, the breakdown voltage is about 250 volts; and for 900 pascals 40% A mixture of krypton, 50% xenon, and 10% nitrogen is about 3000 volts.

Because the utility model uses current to pass through the magnetized electrode, a magnetic field is generated in a certain space according to Ampere's law, and the plasma is magnetized, so that the high-energy secondary electrons are on the surface of the cathode along the azimuth angle of the ring cylinder formed by the magnetic field lines The direction of rotation is absorbed instead of being absorbed directly by hitting the anode. This effect is called the "magnetron effect". As a result, the distance traveled by the secondary electrons from the cathode to the anode is longer, so their existence time is longer, and the probability of their ionization is increased, which can form a higher density plasma. However, the positive ions in the existing plasma display are accelerated by the voltage drop in the cathode area and hit the surface of the cathode, so that the secondary electrons escape, and the secondary electrons obtain higher energy under the acceleration of the electric field in the dark area. When the magnetic field passes through the distance between the two electrodes, it is absorbed by the anode, the life is very short, and the ionization efficiency is very low. The utility model improves the density of the generated plasma through the magnetic field generated by the magnetized electrode, and increases the escape of secondary electrons. At the same time, due to the Larmor cyclone effect, the confinement time of electrons is increased, the probability of impact ionization and excitation is increased, the breakdown discharge voltage is reduced, the pressure on the driving circuit of the plasma display is reduced, and the service life is improved; The energy consumption is established continuously and stably to maintain discharge and reduce power consumption.

Description of drawings:

1 is a schematic cross-sectional view of an AC discharge electromagnetic plasma display discharge unit;

Fig. 2 is an equivalent circuit diagram of the breakdown and sustain discharge parts of the discharge cell of the AC discharge electromagnetic plasma display.

3 is a schematic cross-sectional view of a DC discharge electromagnetic plasma display discharge unit;

FIG. 4 is an equivalent circuit diagram of a discharge unit of a DC discharge electromagnetic plasma display.

Detailed ways:

Example 1: Three-electrode AC transmission surface discharge magnetized plasma display

This embodiment is a typical three-electrode AC transmission surface discharge magnetized plasma display. FIG. 1 shows a cross-sectional view of the discharge unit, and FIG. 2 is a schematic diagram of an equivalent circuit of a breakdown discharge and sustain discharge part of a discharge unit.

Referring to Figures 1 and 2: On the inner surface of the front substrate 1 made of glass with a high yield temperature, including glass of type PD200, there are two films made of indium tin oxide (ITO) with a thickness of 50 nanometers. The transparent sustain electrodes 4a and 4b; the magnesium oxide dielectric layer 3a with a thickness of 20 microns is coated on the front substrate 1 and covers the surface of the sustain electrode 4; On the rear substrate 2 made of glass (using model PD200 glass in this embodiment) towards the side of the sustain electrode 4, there is an address electrode 5 made of silver with a thickness of 5 microns; a magnesium oxide with a thickness of 25 microns The dielectric layer 3b is coated on the rear substrate 2 and covers the surface of the address electrodes 5; between the front substrate 1 and the rear substrate 2 there are barrier ribs 8 perpendicular to them; in this embodiment, the barrier ribs 8 are 40 microns wide, The thickness is 150 microns, and it is made of glass uniformly doped with aluminum powder with a volume percentage of 11% by screen printing; the discharge space 9 surrounded by the front substrate 1, the rear substrate 2 and the barrier wall 8 is sealed and kept at an air pressure of 300 Pascal contains 80% to 95% by volume of inert gas mixed with 5% to 20% of other gases. The inert gas includes helium, argon and neon, and the other gases include nitrogen, mercury vapor, methane and hydrogen; The magnetized electrode 6 made of copper wire with a diameter of 0.1 micron is placed relatively parallel inside the barrier wall 8; a 0.07 mm thick barium magnesium aluminate (BaMgAlO:Eu) fluorescent layer 7 with europium as the luminescent center is printed Coated on the surface of the magnetized electrode 6 , the barrier rib 8 and the dielectric layer 3 b exposed to the discharge space 9 .

The magnetized electrode 6 is connected to the power source 10 ; the sustain electrodes 4 a and 4 b are connected in series with the address electrode 5 , respectively connected to two poles of the power source 10 , and connected in parallel with the magnetized electrode 6 .

When working, the magnetized electrode 6 is energized to magnetize the discharge space 9; after the address electrode 5 is turned on, the sustain electrode 4 is triggered to perform a breakdown discharge on the working gas magnetized by the magnetized electrode 6 in the discharge space 9; after the breakdown discharge, the discharge The plasma generated by the gas undergoes multiple ionizations to generate ultraviolet rays, which radiate on the fluorescent layer 7 to make it emit visible light.

The plasma density in the discharge space 9 magnetized by the magnetized electrode 6 will increase significantly, and the breakdown voltage will also decrease accordingly; the sustain electrode 4 continues to work after the breakdown discharge, and the sustain discharge is performed in the discharge space 9, and the magnetized electrode 6 At the same time, auxiliary sustain discharge is performed, so that stable and effective continuous discharge can be obtained at a lower voltage; due to the increase of the magnetic field in addition to the breakdown discharge method used by the sustain electrode, the original plasma display adopts glow The discharge is completely dependent on the current breakdown voltage, and the method of increasing the magnetic field strength is used to increase the efficiency of plasma generation and increase the excitation efficiency.

In this embodiment, the magnetic field generated by the magnetized electrodes increases the density of the generated plasma, increases the escape of secondary electrons, and increases the probability of impact ionization and excitation. The breakdown discharge voltage is reduced, the pressure of the existing plasma display driving circuit is reduced, the service life is improved, and the power consumption is reduced.

When the power supply is connected in series with the magnetized electrodes, a matching circuit can be added in order to control the change in voltage output due to impedance changes. The simplest matching circuit is to connect an adjustable capacitor in series between the power supply and the magnetized electrodes.

Only one magnetized electrode is used in this embodiment. In order to obtain a more uniform magnetic field in the discharge space, the number of magnetized electrodes can be increased, and the more the number of electrodes, the more uniform the magnetic field. These magnetized electrodes are connected in parallel.

Example 2: DC transmission surface discharge type magnetized plasma display

This embodiment is a typical DC transmission surface discharge plasma display. 3 is a cross-sectional view of a discharge unit of a DC discharge magnetized plasma display; FIG. 4 is an equivalent circuit diagram of a discharge unit of a DC discharge magnetized plasma display.

Referring to FIGS. 3 and 4 : on the inner surface of the front substrate 1 made of glass with a high yield temperature, including the glass of PD200, there is a transparent sustain electrode 4 made of a silver-tin film with a thickness of 5 microns; A 10-micron ruthenium oxide dielectric layer 3a is coated on the front substrate 1 and covers the surface of the sustain electrode 4; parallel to the front substrate 1, a rear substrate 2 made of high yield temperature glass including PD200 glass On the side facing the sustain electrode 4, there is an address electrode 5 made of nickel foil with a thickness of 3 microns; a ruthenium oxide dielectric layer 3b with a thickness of 30 microns is coated on the rear substrate 2 and covers the address electrode 5 There is a barrier rib 8 perpendicular to them between the front substrate 1 and the rear substrate 2; the barrier rib 8 is 150 microns thick and 50 microns wide, and is made of glass uniformly doped with 20% ferric oxide by volume percentage. Manufactured by sand abrasion; the discharge space 9 surrounded by the front substrate 1, the rear substrate 2 and the barrier 8 is sealed to maintain a working gas of 266 Pascals, which contains 80% to 95% of inert gas and 5% to 20% of other gases by volume. The inert gas includes helium, argon and neon, and the other gases include nitrogen, mercury vapor, methane and hydrogen; the magnetized electrode 6 made of copper wire with a diameter of 0.14 microns is pasted in the form of a coaxial coil combined on the inner surface of the barrier rib 8; a 0.1 mm thick silicate (ZnSiO4:Mn) fluorescent layer 7 with manganese as the luminescence center is formed on the magnetized electrode 6, the barrier rib 8 and the dielectric layer 3b exposed on the on the surface of the discharge space 9 .

The sustain electrode 4 is connected to the cathode of the DC power supply 11 , and the address electrode 5 is connected to the anode of the DC power supply 11 .

The magnetized electrode 12 is connected to an AC power source 10 .

The discharge space 9 is magnetized by the magnetized electrode 6; the address electrode 5 receives an electrical signal, triggers the sustain electrode 4 to perform a breakdown discharge on the working gas that has been magnetized by the magnetized electrode 6 in the discharge space 9; after the breakdown discharge, the discharge gas The generated plasma undergoes multiple ionizations to generate ultraviolet rays, which radiate on the fluorescent layer 7 to make it emit visible light.

The density of the plasma in the magnetized discharge space 9 will be significantly increased, and the breakdown voltage will also be reduced; the magnetization method is added in addition to the DC breakdown discharge method used by the sustaining electrode, which changes the original plasma display. The current situation that the glow discharge is completely dependent on the breakdown voltage is adopted, and the efficiency of plasma generation is improved by increasing the current of the magnetized electrode.

The magnetized electrodes in this embodiment are in the form of coaxial coils, and may also be placed on the rear substrate 2 in coiled or other forms.

When connecting the power supply and the magnetized electrode in series, in order to control the voltage output change caused by the impedance change, a matching circuit can be added. The simplest matching circuit is to connect an adjustable capacitor in series between the power supply and the magnetized electrode.

In this embodiment, the magnetic field generated by the magnetized electrodes increases the density of the generated plasma, increases the escape of secondary electrons, and increases the probability of impact ionization and excitation. The breakdown discharge voltage is reduced, the pressure of the existing plasma display driving circuit is reduced, the service life is improved, and the power consumption is reduced.

This plasma discharge method and the plasma display using the method realize the magnetization of the plasma by using the magnetized electrode connected to the power supply, obtain higher plasma density and discharge efficiency, and thereby reduce the breakdown voltage, At the same time, the luminous efficiency of the fluorescent layer is improved. The process is simple and can be realized on existing plasma display production lines.

Claims (6)

1. A plasma display using magnetization, consisting of no less than three independent discharge units with the same structure connected in parallel; each discharge unit is a front substrate and a rear substrate made of transparent materials parallel to each other and four perpendicular to them. A cubic structure composed of two barrier ribs is filled with working gas, a transparent conductive material layer is used as a sustain electrode on the inner surface of the front substrate, and a conductive layer is used as an address electrode on the inner surface of the rear substrate opposite to the sustain electrode; The inner surface of the unit is covered with a fluorescent material layer; it is characterized in that: on the inner surface of the barrier wall of each discharge unit or the front and rear substrates, respectively or simultaneously, magnetized electrodes made of conductive materials are provided, and can generate 0.1-50A current. Any electrode in the AC or DC power supply is connected; the sustain electrode and the address electrode in each discharge unit are respectively connected in parallel to the two poles of the AC or DC power supply capable of generating a voltage of 3-380 volts. 2. The plasma display using magnetization as claimed in claim 1, characterized in that the barrier ribs are 20-100 microns wide and 100-400 microns thick. 3. The plasma display adopting magnetization as claimed in claim 1, characterized in that the transparent conductive material used as the sustain electrode is an indium tin oxide ITO film, tin oxide film, silver foil, Nickel or aluminum foil. 4. The plasma display using magnetization as claimed in claim 1, characterized in that the addressing electrode material is silver foil, nickel foil or aluminum foil with a thickness of 0.01-2 mm. 5. The magnetized plasma display as claimed in claim 1, characterized in that the magnetized electrode material is silver wire, copper wire or aluminum wire with a diameter of 0.01-10 microns. 6. The plasma display using magnetization as claimed in claim 1, characterized in that the surface of the electrode is evenly covered with a layer of dielectric with a dielectric constant of 1-10 and a thickness of 0.001-1 mm as a protective layer.

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