JPH02168533A - Surface discharge type display device - Google Patents

Abstract

PURPOSE:To enhance the brightness of a display screen and save power consumption by specifying the shape of a picture element forming part of maintenance electrodes taking the form of a pair. CONSTITUTION:A pair of maintenance electrodes X, Y are installed on the display screen side of an insulation layer 3 while a write electrode 2 on the opposite side, wherein they are in an attitude of intersecting each other. The write electrode 2 is formed rectangular in a picture element forming part at the intersections of the maintenance electrodes and write electrode, and the maintenance electrodes X, Y are formed so that their facing edges 4a, 4b take a certain shape. That is, the ends of each facing edge approach from the central part, and a substantial ellipse is formed between the two facing edges. Thereby charged particles generated by electric discharge in the picture element part are hindered from dispersion in narrow parts at the ends, and the memory factor of the discharge display device becomes large to lead to fulfillment of the initially set purpose.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a surface discharge type display device.

[Summary of the invention]

The present invention provides a pair of sustain electrodes disposed on the display surface side, and a write electrode on the opposite side of the display surface so as to face the pair of sustain electrodes with an insulating layer interposed therebetween. The sustain electrodes that form the main part are extended so as to face each other in the pixel forming part, and the opposite ends of the opposing edges are formed closer to each other than the central part, thereby increasing the luminous efficiency. This increases the brightness and reduces power consumption at the same time.

[Conventional technology]

A conventional basic AC (alternating current) type PDP (plasma display panel) has a cross-sectional structure as shown in FIG. That is, a plurality of Y electrodes are formed on the back glass (11), an insulating layer (13) is formed thereon, and a protective layer (14) is further formed thereon. A gas space (15) is formed on this protective layer (14), and a protective layer (15) is formed on both sides of the gas space (15).
6) is provided, an insulating layer (17) is formed thereon,
A plurality of X electrodes (step 8) are formed thereon so as to intersect with the plurality of Y electrodes (12). A front glass plate (19) is then formed on this X electrode (18).

When attempting to obtain a color discharge display device by adding a phosphor layer to the discharge display device shown in FIG. It is advantageous to arrange an X electrode and a Y electrode on one side of the phosphor layer to cause the phosphor layer to emit light.

A cross-sectional structure of such a surface discharge type color display device is shown in FIG. In this discharge display device, a Y electrode (12) and an X electrode (18) are arranged with an insulating layer (13) in between.
18) is opposed to the phosphor layer (20) on the lower surface of the front glass plate (19) via the protective layer (14) and the gas space (15).

On the other hand, in PDPs, by utilizing the non-linearity and causing micro-discharges that are different from display discharges, it is possible to lower the discharge voltage, improve high-speed response, and write to the memory panel. It has been known.

In addition, in a DC (direct current) type PDP, a trigger electrode is introduced, as shown in the cross-sectional structure in FIG. 14, and in an AC-type PDP, a memory write electrode is introduced, as shown in the cross-sectional structure in FIG. All of these discharge display layers have a three-electrode configuration.

That is, in the surface discharge type display device shown in FIG.
) side, the trigger electrode (21) is placed through the insulating layer (13).
The X electrode (18) is arranged to cross and face the Y electrode (12) via the gas space (15), and an insulating rib (22) is arranged between adjacent X electrodes (18). It is arranged.

In addition, in the surface discharge type display device shown in FIG. 15, the rear glass plate (
11) A pair of display electrodes, namely X and X sustain electrodes (2
5) and (26) are disposed, and an address electrode (28) is disposed so as to cross and face these X and X sustain electrodes (25) and (26) via an insulating layer (13). Then, the address electrode (28) is connected to the insulating layer (13) and the gas space (15).
) A phosphor layer (20) is formed on the lower surface of the front glass (19) so as to be opposed to each other with the front glass (19) interposed therebetween. The selection of the light emitting parts of the pair of sustain electrodes (25) and (26) is based on the address electrode (28) and the x, X sustain electrodes (25) and (26).
), and once a discharge occurs, the discharge is maintained by the X and X sustaining electrodes (25) and (26).

However, the surface discharge type display devices shown in FIGS. 14 and 15 have a three-dimensional structure, and there is a loss of charge due to the barrier ribs, so they are not very preferable.

Therefore, along with disposing a pair of sustain electrodes on the display surface side,
On the side opposite to the display surface side, a selection electrode is provided so as to cross and face the pair of sustain electrodes with an insulating layer interposed therebetween, and the pair of sustain electrodes are protruded so as to face each other in the pixel forming portion. In this way, a surface discharge type display device as an AC type FDP aimed at high brightness (Japanese Patent Application No. 61-100)
048) has been proposed.

In this surface discharge type display device, as shown in FIG. 16, a pair of sustain electrodes arranged parallel to each other, that is, an X sustain electrode (25) and an X sustain electrode (26) are provided on the display surface side. , these X, X sustain electrodes (25
), the selection electrode (27) faces perpendicularly to (26).
are provided, and x and X sustain electrodes (25) and (26) are made to protrude so as to face each other in the pixel forming portion.

In such a surface discharge type display device, it is known that the luminous efficiency of the discharge display device largely depends on the shape of the projecting portions of the X and X sustaining electrodes (25) and (26). A number of innovations have been made.

In FIG. 17, the projecting portion of the X sustain electrode (25) is narrow, and the projecting portion of the X sustain electrode (26) is narrow, and the projecting portion of the X sustain electrode (25) is They are formed in a shape that surrounds them with a substantially constant gap, and the shapes are slightly different in A, B, and C of the same figure.

Further, in FIG. 9, the shapes of the protruding portions of the X and X sustain electrodes (25) and (26) are respectively formed in the shape of a letter with a substantially constant gap in between.

In any case, such a conventional X, X sustain electrode (25)
, (26), it was found that it was difficult to increase the luminous efficiency sufficiently.

[Problem to be solved by the invention]

In view of this, the present invention aims to propose a surface discharge type display device with a three-electrode configuration, which has even higher luminous efficiency and can simultaneously achieve improved brightness and reduced power consumption. be.

[Means to solve the problem]

The present invention provides a pair of sustain electrodes (4) disposed on the display surface side.
, (5), and on the opposite side from the display surface, the distant layer (3
) have a pair of sustain electrodes (4) and (5) and a write electrode (2) arranged to face each other, and the pair of sustain electrodes (4) and (5) form a pixel. The opposite edges (4a) and (5a) are formed so that the opposite ends thereof are closer to each other than the central part thereof.

[Effect]

According to the present invention, the pair of sustain electrodes (4) and (5)
) are jutted out to face each other in the pixel forming portion, and the opposing edges (4a) and (5a) are formed so that both ends thereof are closer to each other than their respective central portions. Discharge becomes more likely to occur between the central parts, and
Charged particles generated by a discharge in the pixel forming area (pixel formation area) are charged to the opposite edges (4a), (4) of the sustain electrodes (4), (5).
Since the dispersion is prevented by the adjacent ends of 5a), the next discharge becomes easy.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to FIGS. 1 to 7. First, the cross-sectional structure of the surface discharge type display device of this embodiment will be explained with reference to FIGS. 1, 2, and 3. This surface discharge type display device is an AC type FDP. FIG. 2 shows the shape and arrangement relationship of the pair of sustain electrodes and write electrodes of this display device, and FIG. 3 shows the pair of sustain electrodes singly.
A cross section of the entire display device on line 1-1 is shown in FIG. 1A,
A cross section along line 1--2 is shown in FIG. 1B, and a cross-section along line m--2 is shown in FIG. 1C.

In FIGS. 1A, B, and C, (1) is a rear glass plate, and on it, in the direction parallel to the plane of the paper in FIGS. 1A and H,
In other words, in FIG.
, in the direction perpendicular to the paper surface in Figure 1 A and B,
That is, they are arranged at predetermined intervals in a direction parallel to the plane of the drawing (hereinafter referred to as the vertical direction in FIG. 1C).

An insulating layer (dielectric layer) (3) is formed on the back glass plate (1) and the write electrode (2), and on the insulating layer (dielectric layer) (3), a plurality of sets of sustain electrodes are arranged in parallel to each other and extend in the vertical direction; That is,
X sustain electrodes (4) and Y sustain electrodes (5) are arranged at regular intervals in the lateral direction.

An insulating layer (dielectric layer) (6) is formed over the X and Y sustain electrodes (4) and (5) and over the insulating layer (3). Then, on this insulating layer (6), a surface layer (7
) is formed, and a gas space (8) filled with a rare gas such as Ne or Xe is formed above it.

A front glass plate (9) is placed above this gas space (8).
) is arranged.

Now, the X sustain electrode (4) and the Y sustain electrode (5) are extended from the opposing edges (4a) and (5b) so as to face each other in the pixel forming portion, and the 4a) and (5a) are formed so that they are closer to each other than their respective central portions, that is, in this example, they form an ellipse.

The write electrode (2) is formed in a substantially rectangular shape so as to face the X sustain electrode (4) and the Y sustain electrode (5). Note that (2A) is a connecting portion of the write electrode (2).

In addition, in such a surface discharge type display device, the front glass (9
) on the gas space (8) side surface, a phosphor layer is applied,
It is also possible to obtain a surface discharge type color display device.

As can be seen from FIGS. 1A and B and FIGS. 2 and 3, the opposing edges (4a) and (5a) of the X sustain electrode (4) and the Y sustain electrode (5) are Since it is formed so as to constitute a substantially ellipse, the width W of the central part thereof,
is wide, and its width gradually narrows as it approaches its ends. Here, the width near both ends is assumed to be W2.

Figure 1 ASB shows the X sustain electrode (
The discharge path between the X sustain electrode (4) and the write electrode (2) is shown by a curve with arrows at both ends. ), the potential distribution between each opposing edge (4a) and (5a) is shown by a broken line, and the fourth
The X sustain electrode (4) and the X sustain electrode (5) are shown in the figure and FIG.
), the X sustain electrode (4) and the X sustain electrode (5
) and the write electrode (2) are shown by dashed lines.

Therefore, in the case of FIG. 1A, the X sustain electrode (4) and the
Since the distance W between the opposing ends (4a) and (5a) of the sustain electrode (5) is wide, the opening area of the write electrode (2) is wide, and therefore the X sustain electrode (4) and the X The electric field between the sustain electrode (5) and the write electrode (2) is caused by an insulating layer (
6), the discharge that reaches the gas space (8) through the surface layer (7) and occurs between the X sustain electrode (4) and the X sustain electrode (5) and the write electrode (2) , over time, due to wall charge accumulation, the discharge path moves to the opposite electrodes, that is, the X sustain electrode (5) and the X sustain electrode (4), and the discharge path moves to the opposite electrodes, that is, the X sustain electrode (4) and (5) and
Discharge between the write electrode (2) and the write electrode (2) is likely to occur.

On the other hand, in the case of FIG. 1B, since the distance W1 between the opposing ends (4a) and (5a) of the X sustain electrode (4) and the ) becomes narrower, and the strong concentration of potential prevents the charge from diffusing to the outside, confining the charge within the discharge cell. In other words, a discharge occurs due to the electric field of the discharge electrode, but
Depending on their polarity, the charged particles generated are attracted to the discharge electrode of the opposite polarity, but do not diffuse beyond that electrode to the outside. Therefore, the X sustain electrode (
4) and the charged particles generated by the discharge between the X sustain electrode (5) and the write electrode (2) are transferred to the opposite ends (4a) of the X sustain electrode (4) and the X sustain electrode (5), (5a)
Its diffusion is prevented by the narrow parts at both ends. Therefore, the memory coefficient of the discharge display device becomes large, and display over a large area can be performed without malfunction.

Thus, according to such a surface discharge type display device, luminous efficiency is increased, and it is possible to simultaneously improve brightness and reduce power consumption.

Next, the operation of the surface discharge type display device of this embodiment will be explained with reference to FIGS. 6 and 7. Figure 6 shows the X sustain electrode (4), the X sustain electrode (5) and the write electrode (2).
Figure 7 shows the polarity of and the change in charge on the surface layer (7). The optical output Lo is shown.

In period T1, Vx--Vsl, Vy=0, Vw
= V s 3, and as shown in Figure 6A, the X sustain electrode (4) becomes negative, the X sustain electrode (5) becomes positive, and the write electrode (2) becomes positive, so that the surface A positive charge is induced in the corresponding part of the layer (7) to the X sustain electrode (4),
A negative charge is induced in the part corresponding to the X sustain electrode (5),
Negative charges are induced in the portion corresponding to the write electrode (2).

Period T2? : is Vx=Q, V)l=0, Vw=Vs
2, and as shown in FIG. 6B, the X sustain electrode (4) becomes positive, the X sustain electrode (5) becomes positive, and the write electrode (
2) becomes negative, therefore, a negative charge is induced in the part corresponding to the X sustain electrode (4) on the surface layer (7), and a negative charge is induced in the part corresponding to the X sustain electrode (5). is induced, and a positive charge is induced in the portion corresponding to the write electrode (2).

In period T3, Vx=0. , Vy=-Vs7, V w
-V s 3, and as shown in Figure 6C, the X sustain electrode (4) becomes positive, the X sustain electrode (5) becomes negative, and the write electrode (2) becomes positive, thus X on layer (7)
A negative charge is induced in the part corresponding to the sustain electrode (4), and
A positive charge is induced in a portion corresponding to the sustain electrode (5), and a negative charge is induced in a portion corresponding to the write electrode (2).

In period T4, Vx=Q, Vy--0, Vw-Vs
2, and as shown in the sixth diagram, the X sustain electrode (4) becomes positive, the X sustain electrode (5) becomes positive, and the write electrode (2
) becomes negative and therefore the X sustain electrode (
4), a negative charge is induced in the corresponding part of the Y sustain electrode (
5), a negative charge is induced in the part corresponding to the write electrode (
Positive charges are induced in the portion corresponding to 2).

Then, it returns to period TI again, and in this period T1, V
x=-Vsl, Vy=O1Vw=V39, and the sixth
As shown in Figure E (Figure 6A), the X sustain electrode (4) becomes negative, the Y sustain electrode (5) becomes positive, and the write electrode (2)
becomes positive, therefore, the X sustain electrode (4) on the surface layer (7)
), a positive charge is induced in the corresponding part with the Y sustain electrode (5
), a negative charge is induced in the corresponding part of the write electrode (2
) A negative charge is induced in the corresponding part. This will be repeated below.

Incidentally, the optical output O is the period T1 to T4, and TH to T4.
Occurs at transition points.

Next, the width between the opposing edges (4a) and (5a) of the X sustain electrode (4) and Y sustain electrode (5) of the above-mentioned example is as follows:
When changing from small to large and each opposing edge (4a)
, (5a) A conventional X sustain electrode with an M-shaped gap (
4) and Y sustain electrode (5), the luminance (cd/m
2)-Sustaining voltage (V) characteristics in the case where the voltage Vw of the write electrode (2) is 200 V and the degree of vacuum is 500 torr, in the case where no phosphor layer is provided, and in the display device of FIG. 1, The cases in which a phosphor layer is coated on the surface of the front glass (9) on the gas space (8) side are shown in FIGS. 1O and 11, respectively.

10 and 11, * indicates the case where the width between the opposing edges of the X sustain electrode (4) and Y sustain electrode (5) of the embodiment of FIG. 8 is the narrowest [the opposing edges are ( 4a+),
(5a+)], and Δ is when the width between the opposing edges of the X sustain electrode (4) and the Y sustain electrode (5) in the embodiment of FIG. Edge (4a2)
, (5as)] is measured when the width between the opposing edges of the X sustain electrode (4) and the Y sustain electrode (5) in the embodiment of FIG. Edges (4as
), (5a3))], ○ is the 8th measurement point.
The figure shows measurement points when the gap between the opposing edges (4am) and (5am) is M-shaped, and the measurement points are connected by a curved line.

According to this, it can be seen that the X sustain electrode (4) and Y sustain electrode (5) according to the present invention have higher brightness than the conventional example, and moreover, the change in brightness with respect to the change in the sustain voltage is large. .

Note that the shapes of the opposing edges (4a) and (5a) of the X sustain electrode (4) and the Y sustain electrode (5) are not limited to ellipses, but may also be circular,
It does not matter what shape it is, such as a polygon.

〔Effect of the invention〕

According to the present invention described above, it is possible to obtain a surface discharge type display device that has high luminous efficiency and can simultaneously achieve improvement in brightness and reduction in power consumption.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a surface discharge type display device according to an embodiment of the present invention;
FIG. 2 is a plan view showing the sustain electrodes and write electrodes of the example, FIG. 3 is a plan view showing the sustain electrodes of the example, and FIGS. 4 and 5 are two views of the surface discharge type display device of the example. A diagram showing the electric field between the sustain electrode and the write electrode, FIG. 6 is an explanatory diagram of the operation of the embodiment, FIG. 7 is a timing chart showing changes in the voltage applied to both the sustain electrode and the write electrode of the embodiment, and FIG.
9 is a plan view showing both sustain electrodes of the embodiment, FIG. 9 is a plan view showing both conventional sustain electrodes, FIGS. 10 and 11 are luminance-sustaining voltage characteristic curve diagrams, and FIGS. 12 and 13. Figure, 1st
4 and 15 are cross-sectional views showing conventional discharge display devices, FIG. 16 is a layout diagram showing the sustain electrodes and selection electrodes of the conventional discharge display device, and FIG. 17 is a cross-sectional view of the conventional discharge display device. FIG. 3 is a plan view showing an electrode. (1) is the back glass plate, (2) is the write electrode, (3) is the insulating layer, (4) is the X sustain electrode, (4a) is its opposite edge, (5) is the Y sustain electrode, (5a) is its opposite edge, (6
) is an insulating layer, (7) is a surface layer, (8) is a gas space, (9
) is the front glass plate. Figure 21 Holding i4 of Example Figure 3 Figure 3 Lath (Reverse Tying Chard Figure 7 Figure 8 Resistant Electric Works (V) Maintaining Voltage (V) -a- Conventional m-holding electrode 1 degree - maintenance voltage characteristics fi over maintenance voltage 11 Fig. 9) ■ 0 Fig. 1 Fig. 1 Conventional surface 1jk, electronic display device display length τ Fig. 1 6] Conventional surface Discharge type display device Fig. 13 Fig. 1 5 Fig. 1 7

Claims (1)

[Scope of Claims] A pair of sustain electrodes arranged on the display surface side, and a write electrode arranged opposite to the pair of sustain electrodes with an insulating layer interposed therebetween on the side opposite to the display surface. The pair of sustain electrodes are protruded so as to face each other in the pixel forming portion, and both ends of each opposing edge thereof are formed closer to each other than their respective central portions. A surface discharge type display device characterized by: