CN1971819A - Plasma display device - Google Patents

Abstract

This invention relates to one plasma display, which is one display with three electrode discharge, which comprises the following characteristics: the top baseboard side is formed with one pair of parallel scan electrode or sustain electrode with several ones; the down baseboard and above scan electrode and sustain electrode are crossed with several research electrodes; the above down baseboard forms interval wall to divide or rule discharge space; forming fluorescence part between above isolation walls; the said fluorescence part forming back comprises reflection surface on above baseboard.

Description

Plasma display

Technical field

The present invention is relevant a kind of plasma display that can improve luminous efficiency.

Background technology

Plasma display (Plasma Display Panel: hereinafter referred to as " PDP ") utilizes He+Xe, Ne+Xe, and the ultraviolet ray that generates during the discharge of inert mixed gas such as He+Xe+Ne makes light-emitting phosphor come display image.This PDP not only can realize ultra-thinization and maximization, and because strengthened the technological development dynamics at present, so further improved image quality.

With reference to Fig. 1, the arresting element of 3 electrode AC creeping discharge type PDP is by being positioned at scan electrode 8Y on the upper substrate 10, keeping the address electrode 2 that electrode 8Z is positioned on the lower basal plate 12 in addition and constitute.

Scan electrode 8Y and keep electrode 8Z and comprise transparency electrode 4Y respectively, 4Z and be positioned at the metal buffer electrode 6Y of transparency electrode one lateral edges, 6Z, metal buffer electrode 6Y, the wire spoke of 6Z is less than transparency electrode 4Y, the wire spoke of 4Z.Transparency electrode 4Y, 4Z are formed on the upper substrate 10, are that material is made with indium-tin-oxide (Indium TinOxide:ITO) normally.Metal buffer electrode 6Y, 6Z are that material is made with indium-tin-oxide usually, are formed on transparency electrode 4Y, on the 4Z, play making high-resistance transparency electrode 4Y, the effect that 4Z voltage descends and weakens.At scan electrode 4Y with keep on the upper substrate 10 that electrode 4Z is positioned at and scribble upper dielectric layer 14 and diaphragm 18.Accumulating the wall electric charge that plasma discharge generates on the upper dielectric layer 14.Diaphragm 18 is sharp the penetrating that generate during with plasma discharge, and protection upper dielectric layer 14 improves the emission efficiency of 2 electronics.Usually use magnesium oxide (MgO) to do diaphragm 18.

Address electrode 2 with scan electrode 8Y, keep the direction that electrode 8Z intersects and be arranged on the lower basal plate 12.Lower dielectric layer 16 and spaced walls are arranged on the lower basal plate 12 at address electrode 2 places.On lower dielectric layer 16 and spaced walls 20 surfaces, form luminescent coating 22.Spaced walls 20 will be distinguished from textural with the arresting element that address electrode 2 is set up in parallel, and prevent to leak on the contiguous arresting element because of ultraviolet ray and visible light that discharge generates.It is UV-activated luminous that luminescent coating 22 generates during by plasma discharge, generates the visible light of a certain color in red, green or the blueness.On being arranged on/inject the He+Xe that can discharge, Ne+Xe, inert mixed gas such as He+Xe+Ne in the discharge space of arresting element between lower part substrate 10,12 and the spaced walls 20.

The discharge principle of this PDP is as follows, goes up voltage if lead to between electrode, and the electronics (+) that exists between gas so will quicken to electrode direction.High-velocity electrons can and neutral gas bump, the neutral gas (+) that obtains energy because of collision can experience and be separated into the ionization process of electron ion and electronics, or causes the violent change process that the outermost electron of neutral gas moves to the high energy level of energy.At this wherein, when the neutral gas that produces in the violent change process turned back to the low base state of energy, the energy with corresponding difference discharged the ultraviolet form with specific wavelength.Fluorophor absorbs the ultraviolet ray that at this moment generates, and after violent change is the high level state, returns base state again, discharges luminous energy and visible light.

As shown in Figure 2, the visible light that generates because of discharge is to as each arresting element directional divergence beyond the upper substrate direction of display surface.30-50% in the visible light of each arresting element directional divergence disperses to the top orientation substrate, but disperses to spaced walls and lower basal plate.Because of the visible light of directional divergence beyond this display surface can't play effect to display effect, so this has just caused the low and luminous efficiency reduction of integral brightness.

At present, for improving the reflectivity of the visible light of dispersing from lower basal plate, though the dielectric that is formed on the lower basal plate includes TiO2 (carbon dioxide) and Al2O3 compositions such as (alundum (Als), but reflectivity at this moment only accounts for 50-70%, so this just requires to continue to improve to better direction.

Particularly, if the overall efficiency of considering PDP less than 1% this point, for increasing the efficient of PDP, be studied various evolutionary approach, one of them effectively utilizes exactly to inoperative that a part of visible light of display effect.

Summary of the invention

Therefore, the present invention proposes for the problems referred to above that solve present existence just.The purpose of this invention is to provide a kind of structure that can improve the plasma display (PDP) of luminous efficiency.

Plasma display of the present invention is a kind of 3 electrode surface discharge type plasma displays.To achieve these goals, the plasma display among the present invention has the reflecting surface that the visible light of emitting in the above-mentioned discharge space can be reflected to above-mentioned upper substrate direction, and reflecting surface is positioned at the back side that lower basal plate forms fluorescence dignity.

Above-mentioned reflecting surface is that one deck is silver-plated.

Above-mentioned silver-platedly generate by silver mirror reaction.

Effect of the present invention:

As mentioned above, the plasma display among the present invention increases the light-emitting area of fluorophor, and discharging efficiency improves.

For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.

Description of drawings

Figure 1 shows that the sectional view of existing 3 electrode plasma displays.

Send the path skeleton diagram of visible light in the display shown in Fig. 2 presentation graphs 1.

Fig. 3 is the sectional view of embodiment of the invention ionic medium display.

Send the path skeleton diagram of visible light in the display shown in Fig. 4 presentation graphs 3.

The symbol description of major part in the accompanying drawing:

4Y, 4Z: transparency electrode 6Y, 6Z: buffer electrode

10,30: upper substrate 12,32: lower basal plate

14,16,34,36: dielectric 18,38: diaphragm

20,40: spaced walls 22,42: luminescent coating

50: reflecting surface

Embodiment

Embodiment to plasma display of the present invention is elaborated below with reference to accompanying drawings.

With reference to Fig. 3 to Fig. 4, embodiments of the invention are described as follows.

With reference to Fig. 3, the arresting element of the plasma display among the present invention comprises two parts, the one, by scan electrode 28Y and keep the upper substrate 30 that electrode 28Z, upper dielectric layer 34 and diaphragm 38 constitute; The 2nd, the lower basal plate 32 that constitutes by address electrode 52, lower dielectric layer 36, spaced walls 40, luminescent coating 42 and reflecting surface 50.

Scan electrode 28Y and keep electrode 28Z and comprise transparency electrode 24Y respectively, 24Z and be positioned at the metal buffer electrode 26Y of transparency electrode one lateral edges, 26Z, metal buffer electrode 26Y, the wire spoke of 26Z is less than transparency electrode 24Y, the wire spoke of 24Z.Transparency electrode 24Y, 24Z are formed on the upper substrate 30, are that material is made with indium-tin-oxide normally.Metal buffer electrode 26Y, 26Z are that material is made with chromium (Cr) usually, are formed on transparency electrode 24Y, on the 24Z, play making high-resistance transparency electrode 24Y, the effect that 24Z voltage descends and weakens.Upper dielectric layer 34 is formed on the upper substrate 30, if the wall electric charge that generates during the accumulation plasma discharge split pole phenomenon will appear, in the logical voltage of going up.Diaphragm 38 is sharp the penetrating that generate during with plasma discharge, and protection upper dielectric layer 34 improves the emission efficiency of 2 electronics.Usually use magnesium oxide (MgO) to do diaphragm 38.

Address electrode 52 with scan electrode 28Y, keep the direction that electrode 28Z intersects and be arranged on the lower basal plate 32.Lower dielectric layer 36 and spaced walls are arranged on the lower basal plate 32 at address electrode 52 places.Spaced walls 40 will be distinguished from textural with the arresting element that address electrode 52 is set up in parallel, and prevent to leak on the contiguous arresting element because of ultraviolet ray and visible light that discharge generates.On being arranged on/inject the He+Xe that can discharge, Ne+Xe, inert mixed gas such as He+Xe+Ne in the discharge space of arresting element between lower part substrate 30,32 and the spaced walls 40.On lower dielectric layer 36 and spaced walls 40 surfaces, form luminescent coating 42.It is UV-activated luminous that luminescent coating 42 generates during by plasma discharge, generates the visible light of a certain color in red, green or the blueness.

After the luminous ray that generates during reflecting surface 50 discharges sees through lower basal plate, invalid light is reflected to the display surface direction.

The visible light that generates during discharge is to all scope reflections of arresting element.Wherein except that the visible light that the upper substrate to display surface reflects, a part of light is to spaced walls and fluorophor radiation for this.In the visible light of the lower basal plate radiation that scribbles fluorophor, a part is reflected by fluorophor, and a part sees through fluorophor and reflects to lower basal plate.At this moment, the reflecting surface that forms on by lower basal plate to the visible light of lower basal plate reflection is all reflected.Even saw through the visible light that lower basal plate does not increase briliancy originally, make its reflection by the reflecting surface that forms on the lower basal plate, the process discharge space makes the upper substrate on its transmission display face.

Therefore, make the inoperative invalid light of briliancy, can improve briliancy and luminous efficiency to the display surface scattering.

This reflecting surface 50 is made by silver-plated.Form silver-plated method have a variety of, but for simple for production, can use the method for silver mirror reaction.

Silver mirror reaction is meant and adds acetaldehyde in liquor argenti nitratis ophthalmicus, utilizes the reproducibility of acetaldehyde to separate out the method for silver particles.Utilize silver mirror reaction, the method that forms reflecting surface 50 on lower basal plate is as follows.

The part that will form reflecting surface 50 in lower basal plate immerses and is equipped with in the tank of acetaldehyde (CH3CHO) or the two wherein a kind of dilute solution of formaldehyde (HCHO), adds silver nitrate (AgNO3).The silver ion that generates in silver nitrate (AgNO3) is obtained to be reduced to metal behind its electronics that provides by acetaldehyde (CH3CHO) or formaldehyde (HCHO) oxidation.

The pH value of sodium oxide molybdena is high, so improved the reducing power of acetaldehyde (CH3CHO) or formaldehyde (HCHO).

In the embodiment of this invention, be formed on heat release thin slice that lower basal plate and display combine or the position between the heat liberation board exactly at the reflecting surface 50 that utilizes chemical method to generate on the lower basal plate.

Several those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.

Claims (3)

1, a kind of plasma display is 3 electrode surface discharge type plasma displays, it is characterized in that:

The scan electrode of the pair of parallel that forms on side of upper substrate or keep electrode, the two is several configurations;

At lower basal plate and above-mentioned scan electrode and keep on the direction that electrode intersects, dispose several address electrodes;

On above-mentioned lower basal plate, be formed for dividing or the spaced walls of regulation discharge space; Between above-mentioned spaced walls, form fluorophor;

Described fluorophor includes reflecting surface on the back side of the formation face on the above-mentioned upper substrate.

2, ion display as claimed in claim 1 is characterized in that:

Above-mentioned reflecting surface is that one deck is silver-plated.

3, ion display as claimed in claim 2 is characterized in that:

Above-mentioned silver-platedly form by silver mirror reaction.

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