JPH0484189A - Gas discharge type display device - Google Patents

Abstract

PURPOSE:To obviate the degradation in light emission efficiency even if a discharge space is widened to increase light emission brightness by forming voltage supply electrodes for supplying discharge voltages from the outside to at least one of the opposite surface sides of a front surface plate and a rear surface plate and providing connecting conductors which connect the voltage supply electrodes to high-dielectic elements. CONSTITUTION:This display device is constituted by forming discharge electrodes of the high-dielectric elements 50, forming the high-dielectric elements 50 in such a manner that the discharge surfaces 54 thereof face the opposite surfaces of the front surface plate 32 and the rear surface plate 34 nearly orthogonally therewith, forming the voltage supply electrodes 44, 46 for supplying the discharge voltages from the outside to at least one of the opposite surface of the front surface plate 32 and the rear surface plate 34, and providing the connecting conductors 60, 62 to connect these voltage supply electrodes to the high- dielectric elements 50. The specific dielectric constant of the high-dielectric elements 50 is larger than the specific dielectric constant of the discharge gas and, therefore, if the discharge voltages are impressed between the prescribed voltage supply electrodes, the electric fields in the discharge space are nearly parallel and nearly uniformly distributed. The light emission efficiency is improved in this way even if the discharge space is widened in order to increase the light emission in intensity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an improvement in a gas discharge display device such as a plasma display panel, which is a flat display device.

[Prior Art] A conventional AC type color plasma display panel has a discharge space filled with discharge gas formed between the facing surfaces of a front plate (for example, a cover) and a rear plate (for example, a substrate), and a discharge space filled with discharge gas is formed on the rear plate. A discharge electrode whose discharge surface is parallel to the surface of the back plate is provided, a thin insulating layer is provided on the discharge electrode, and a light-emitting display is produced by the discharge between the facing discharge electrodes.

``Problem to be solved by the invention'' However, in conventional plasma display panels, the discharge surface of the discharge electrode was formed in a planar electrode structure parallel to and on the same plane as the surface of the back plate. This makes it easier to form the discharge electrode, but when trying to increase the luminance by widening the discharge space, there is a problem that the distribution of the electric field applied to the discharge space becomes uneven and the luminous efficiency deteriorates. .

Additionally, there was a problem in that, in addition to the discharge electrode, a spacer to maintain a predetermined distance between the front plate and the back plate and a barrier to prevent crosstalk were required.The present invention was made in view of the above points. An object of the present invention is to provide a gas discharge type display device in which electrode formation is as easy as that of a flat electrode structure, and the luminous efficiency does not deteriorate even if the discharge space is widened to increase the luminance. It is something.

A gas discharge type display device according to the present invention has a discharge space filled with a discharge gas between opposing surfaces of a front plate and a back plate, and a display device provided facing the discharge space. In a gas discharge type display device that performs luminescent display by discharge between opposing discharge electrodes, the discharge electrode is formed of a high dielectric element, and the discharge surface of the high dielectric element is located opposite to the front plate and the back plate. A voltage supply electrode for supplying a discharge voltage from the outside is formed on the opposing surface side of at least one of the front plate and the rear plate, and the voltage supply electrode is formed so as to be substantially orthogonal to the surface. The device is characterized in that a connecting conductor is provided to connect to the high dielectric element.

In order to enable simple matrix drive as a matrix display device, high dielectric elements forming discharge electrodes are arranged and fixed in a matrix on at least one of the facing sides of the front plate and the back plate. A row electrode group and a column electrode are formed of a rectangular parallelepiped-shaped high dielectric element group, voltage supply electrodes are fixed insulated from each other on opposing surfaces of at least one of the front plate and the back plate, and the row electrode group and the column electrode intersect in a matrix shape. A connecting conductor is formed by a connecting conductor group that connects the row electrode group and column electrode group to the high dielectric element group, and the connecting conductor group connects the discharge surface of the high dielectric element group to the high dielectric element group. For three consecutive high dielectric elements along substantially orthogonal directions, when a row electrode is connected to the middle high dielectric element, different column electrodes are connected to two high dielectric elements on both sides, The row electrode group and the column electrode group are connected to the high dielectric element group so that when the column electrode is connected to the high dielectric element in the middle, different row electrodes are connected to the two high dielectric elements on both sides. It is connected to.

Furthermore, in order to reduce the number of types of components, the high dielectric element forming the discharge electrode also serves as a spacer for maintaining a predetermined distance between the front plate and the back plate.

In addition, in order to further improve luminous intensity and luminous efficiency,
A high dielectric element forming a discharge electrode is formed of transparent ceramics (for example, a PLZT element).

"Operation" When a driving voltage is applied between predetermined voltage supply electrodes, this driving voltage is supplied to the high dielectric element forming the discharge electrode via the connecting conductor. Since the dielectric constant (for example, 500Q) of this high dielectric element is much larger than the dielectric constant (for example, 1) of the discharge gas, the electric field in the discharge space is distributed almost parallel to the discharge surface and almost uniformly. Therefore, when this driving voltage is made higher than the discharge starting voltage, discharge occurs in the entire discharge space, generating strong ultraviolet rays or visible light.

The high dielectric elements that form the discharge electrode are formed by a group of high dielectric elements arranged and fixed in a matrix, and the voltage supply electrode is formed by a group of row electrodes and a group of column electrodes that intersect in a matrix and are connected. A conductor is formed of a group of connecting conductors that connect the row electrode group and the column electrode group to the high dielectric element group, and the connecting conductor group connects the row electrode group and the column electrode group to the high dielectric element group, and the conductor is formed along a direction substantially perpendicular to the discharge surface of the high dielectric element group. For three consecutive high dielectric elements, when the row electrode is connected to the middle high dielectric element, different column electrodes are connected to the two high dielectric elements on both sides, and the middle high dielectric element If a column electrode is connected to the two high dielectric elements on both sides and different row electrodes are connected to the two high dielectric elements on both sides, a matrix display capable of simple matrix driving can be performed.

Further, if the high dielectric element forming the discharge electrode is configured to also serve as a spacer that maintains a predetermined distance between the front plate and the back plate, the number of types of constituent elements can be reduced.

Furthermore, when the high dielectric elements forming the discharge electrodes are made of transparent ceramics (for example, PLZT elements), the amount of visible light transmitted to the front plate side increases, reducing the luminous intensity and luminous efficiency. Further improvements can be made.

"Embodiment" Figures 1 to 5 show an embodiment of the present invention, and in these figures, 32 and 34 are made of a transparent material (for example, glass) and have a discharge space for gas discharge. 36, a front plate and a back plate are provided facing each other at a predetermined interval (100 to 200 μm).

Transparent column electrodes 44 . . . are insulated from each other via insulating films 42 , and intersect in a matrix on the opposing surface of the back plate 34 . . . . and transparent row electrodes 46, . High dielectric elements 50, . . . as discharge electrodes are fixed to the opposite surface of the front plate 32.

The high dielectric elements 50, . . . are made of transparent ceramics such as P L Z T elements having a high dielectric constant (for example, 5000), and are arranged in a matrix.

The above-mentioned PLZT element is an electro-optical element PLZT (
For example (P ba-qx Lao, as) (Zro-g
g Txa, 3N) 03) into a rectangular column shape. Column direction (second
A pair of side surfaces facing each other in the vertical direction in the figure are provided with discharge spaces 36p of adjacent display pixels 48, . . .
, . . are formed, and these discharge surfaces 54 and 54, . . . face the front plate 32.
and is formed to be substantially orthogonal to the opposing surface of the back plate 34. On the opposing surface of the front plate 32, phosphor films 52 facing the discharge spaces 36ρ, . . . of the display pixels 48, .
A transparent film is provided on the opposing surface of the display pixels 48, . Barriers 55, . . . are formed in an elongated shape (elongated in the vertical direction in FIG. 2) using glass paste or the like. The back plate 3 of the high dielectric element 50, . . .
Transparent connection electrodes 56, . . . are fixed to the surface of the fourth side. A MgO film having a predetermined thickness (for example, 0.5 μm resistance) is coated on the surfaces of the discharge surfaces 54 of the high dielectric elements 50, . . . as necessary.
The film is an example of a material that is easy to cause discharge and is not easily damaged by sputtering during discharge (hereinafter simply referred to as a material that is easy to cause discharge). 60, . . . are first connection conductors made of a transparent conductor, and these first connection conductors 60, . . . connect every other row of the high dielectric elements 50, . The row electrodes 46, . . . via the electrodes 56, .
・Connected to. 62 and 62, . . . are second connection conductors formed of transparent conductors, and these second connection conductors 62 and 6
2, . . . for each column of the remaining high dielectric elements 50 to which the row electrodes 46, . . . of the high dielectric elements 50, . Every other high dielectric constant element 50, . In other words, the high dielectric elements 50, . . .
6, . . . and those not connected to the row electrodes 46, . . . are connected to the column electrodes 44, . The surface of the high dielectric element 50, . . . on the back plate 34 side, and the first and second connection conductor groups 60, .
The unconnected portions of 2, . . . are connected to the back plate 34.
It is stably fixed to the back plate 34 by an adhesive layer 65 formed by applying the adhesive layer 65 to the opposing surface. As a result, the high dielectric elements 5o, . . .
2 and the back plate 34 at a predetermined distance.

When driving the display device formed as described above, a video signal is supplied to one of the column electrodes 44, . . . and a scanning signal for scanning is supplied to the other of the row electrodes 46, . , predetermined column electrodes 44, . . . and row electrodes 46, .
A driving voltage is applied between. Then, between the high dielectric elements 50, . . . facing the discharge space 36P, . . . located at the intersection of the column electrodes 44, . A discharge starts, and the phosphor films 52, . . . emit light due to the ultraviolet rays generated by this discharge, thereby producing a predetermined display. More specifically, in FIG. 2, three high dielectric elements 50 that are continuous in the column direction (vertical direction)
(j,), 50(i), 50(j,) formed between discharge spaces 36p(x - jz) and/or 36p(
i, J2), the i-th row electrode 46(i
) and the column electrode 44 (j, ) of the j-th column, and/or between the row electrode 46 (i) of the i-th row and the column electrode 44 (j, ) of the j-th column
When a discharge voltage is applied between the discharge spaces 36p (
Discharge occurs at i, j□) and/or 36ρ(x, J2).

Ultraviolet light is generated and the corresponding phosphor film 52.52 emits light. At this time, high dielectric elements 5o(j2), 50(i)
.

50 (jL) has a high dielectric constant (for example, 5000),
Discharge space 36p (i, jl), 36p (i, , j
Since the dielectric constant of the discharge gas in the discharge space 36p (i, j, ) and/or 36P (
1, J2) before the discharge starts at equipotential line 66,...
As shown in FIG. 5, the rays are distributed parallel to the discharge surface 54, 54 and almost uniformly. Therefore, when the applied voltage becomes equal to or higher than the discharge starting voltage, discharge occurs in almost the entire discharge space 36p (i, j□) and/or 36p (1-52), and phosphor light is generated due to strong ultraviolet rays.

After the discharge drive, for the discharge space 36P during the discharge display, the discharge is maintained at a sustained voltage that is approximately half the discharge starting voltage, and the wall charge is neutralized by the erase discharge to stop the discharge. be able to. For this reason, the discharge surfaces 54 and 54,
There is a memory effect due to the charged particles (so-called wall charges) accumulated in .

In the above embodiment, the high dielectric element forming the discharge electrode is
It is formed by a group of high dielectric elements arranged and fixed in a matrix, and the voltage supply electrode is formed by a group of row electrodes and a group of column electrodes that intersect in a matrix.

A connecting conductor is formed of a group of connecting conductors that connect the row electrode group and the column electrode group to the high dielectric element group, and the connecting conductor group connects the row electrode group and the column electrode group to the high dielectric element group. For three consecutive high dielectric elements along the line, when a row electrode is connected to the middle high dielectric element, different column electrodes are connected to the two high dielectric elements on both sides, and the middle high dielectric element When a column electrode is connected to an element, different row electrodes are connected to the two high dielectric elements on both sides, making it possible to perform a matrix display that allows simple matrix drive. However, the present invention is not limited thereto, and can be applied to a direct drive type matrix display device or a gas discharge type display device other than a matrix display device.

In the above embodiment, the high dielectric element forming the discharge electrode is
Although the number of types of components is reduced by also using a spacer to maintain a predetermined distance between the front plate and the back plate, the present invention is not limited to this, and a display device in which a spacer is provided separately from a high dielectric element. It can also be used for

In the above embodiment, the high dielectric element forming the discharge electrode is P
Although the present invention is made of a transparent ceramic such as an LZT element and increases the amount of visible light transmitted to the front plate side to further improve the luminous intensity and luminous efficiency, the present invention is not limited to this. The high dielectric element forming the discharge electrode may have a dielectric constant sufficiently larger than the dielectric constant of the discharge gas in the discharge space (for example, 100 to 10,000).

In the above embodiment, the case of phosphor emission was explained, but
The present invention is not limited to this, and can also be used for gas discharge light emission.

"Effects of the Invention" As described above, in the gas discharge type display device according to the present invention, the discharge electrode is formed of a high dielectric element, and the discharge surface of the high dielectric element is perpendicular to the facing surfaces of the front plate and the back plate. 1. Even if the discharge space is widened to increase the emission intensity, the electric field distribution in the discharge space can be made almost uniform, and the discharge electrodes are more compact than conventional examples with a planar electrode structure. Luminous efficiency can be improved. Moreover, the voltage supply electrodes (for example, the row electrode group and the column electrode group) that supply the discharge voltage to the high dielectric element can be formed with a planar electrode structure on the opposing surfaces of at least one of the front plate and the back plate. Electrode formation is easy.

In addition, the high dielectric elements that form the discharge electrodes are formed by a group of high dielectric elements arranged and fixed in a matrix, and the voltage supply electrodes are formed by a group of row electrodes and a group of column electrodes that intersect in a matrix. , a connecting conductor is formed of a group of connecting conductors that connect the row electrode group and the column electrode group to the high dielectric element group, and the connecting conductor group connects the row electrode group and the column electrode group to the high dielectric element group, and the connecting conductor group forms a connection conductor in a direction substantially perpendicular to the discharge surface of the high dielectric element group. For three consecutive high-k dielectric elements along When a column electrode is connected to a body element, if different row electrodes are connected to two high dielectric elements on both sides, a matrix display capable of simple matrix driving can be performed.

Further, if the high dielectric element forming the discharge electrode is configured to also serve as a spacer for maintaining a predetermined distance between the front plate and the back plate, the number of types of constituent elements can be reduced.

In addition, when the high dielectric element forming the discharge electrode is made of transparent ceramics such as a PLZT element, the amount of visible light transmitted to the front plate side increases, reducing the luminous intensity and luminous efficiency. Further improvements can be made.

[Brief explanation of the drawing]

1 to 5 show essential parts of an embodiment of the gas discharge type display device according to the present invention, and FIG. 1 is A of FIG. 2.
-A line sectional view (side sectional view of the panel seen from the direction perpendicular to the discharge surface of the high dielectric element), Figure 2 is the BB line sectional view (front sectional view of the panel) of Figure 1, A diagram in which the insulating film and the transparent adhesive layer are omitted, and FIG. 3 is taken from C-C in FIG. 2.
Figure 4 is a cross-sectional view taken along the line D-D in Figure 2 (a side cross-sectional view of the panel viewed from a direction parallel to the discharge surface of the high dielectric element), and Figure 5 is a cross-sectional view taken along the line D-D in Figure 2. FIG. 3 is an explanatory diagram illustrating the electric field distribution before the start of the electric field. 32... Front plate, 34... Back plate, 44... Column electrode, 46... Row electrode, 50.50(i), 50(j,
), 50 (j2)...High dielectric element, 32... Front plate, 34... Back plate, 36.36p, 36p(i, j
), 36P (1-52)...discharge space, 44...
Column electrode, 46... Row electrode, 52... Display pixel,
54...Discharge surface, 56...Connection electrode, 60.62.
...Connection conductor. Applicant Fujitsu General Ltd.

Claims (4)

[Claims] (1) A gas discharge in which a discharge space filled with discharge gas is formed between the facing surfaces of the front plate and the back plate, and a light-emitting display is produced by discharge between opposing discharge electrodes facing this discharge space. In the type display device, the discharge electrode is formed of a high dielectric element, the discharge surface of the high dielectric element is formed to face substantially perpendicular to the opposing surfaces of the front plate and the back plate, and A voltage supply electrode for supplying a discharge voltage from the outside is formed on at least one opposing surface side of the back plate, and a connection conductor is provided for connecting the voltage supply electrode to the high dielectric element. Gas discharge type display device. (2) The high dielectric element forming the discharge electrode consists of a group of approximately rectangular parallelepiped high dielectric elements arranged and fixed in a matrix on the opposing surfaces of at least one of the front plate and the back plate, and the voltage supply electrode consists of a row electrode group and a column electrode group that are fixed to opposing surfaces of at least one of the front plate and the back plate in an insulated manner and intersect with each other in a matrix shape, and the connecting conductor is connected to the row electrode group and the column electrode group. The connecting conductor group connects the high dielectric element group to the high dielectric element group. When the row electrode is connected to the high-k dielectric element, different column electrodes are connected to the two high-k dielectric elements on both sides, and when the column electrode is connected to the middle high-k element, The gas discharge type display device according to claim 1, wherein the row electrode group and the column electrode group are connected to the high dielectric element group such that two high dielectric elements are connected to different row electrodes. . (3) Claim (1) or (2) wherein the discharge electrode also serves as a spacer for maintaining a predetermined distance between the front plate and the back plate.
Gas discharge type display device as described. (4) The gas discharge type display device according to claim 1, (2) or (3), wherein the high dielectric element forming the discharge electrode is made of transparent ceramics.