JP3005020B2 - Plasma display panel - Google Patents

Description

Description: TECHNICAL FIELD [0001] The present invention relates to a plasma display panel capable of performing color display by providing a phosphor that emits light by discharge.

A plasma display panel (PDP) has excellent visibility among various flat display devices, and is also being used as a display for a large number of people (so-called public display) such as a guide display of a public facility. Accordingly, a PDP having a large display screen and capable of high-quality color display has been demanded.

[Conventional technology]

A dot matrix display type PDP that displays characters and figures by combining dots to emit light (emission unit area) has a pair of glass substrates on the display side and the back side arranged opposite to each other with a discharge space, and arranged in a grid pattern It is configured to selectively discharge each discharge cell defined at or near each intersection of the set of electrodes.

Conventionally, there has been known an AC (alternating current) drive type PDP in which a discharge electrode for dot matrix display is covered with a dielectric layer and a phosphor that emits light by discharge is provided to enable multicolor display. (A surface discharge type PDP disclosed in JP-A-62-219438).

In such a surface discharge type PDP, the phosphor is generally provided on the back surface side of the discharge space, that is, on the inner surface of the glass substrate on the back surface side, in order to increase the display brightness. And, in order to reduce the ion bombardment of this phosphor at the time of discharge,
A plurality of discharge sustaining electrode pairs for causing a discharge are provided on the glass substrate on the display side.

 FIG. 4 is a partial perspective view of a conventional surface discharge type PDP2.

PDP2 is a glass substrate 10 on the display side, and a pair of parallel main discharge electrodes extending in the horizontal (X) direction on the inner surface of the glass substrate 10.
Plural sustain electrode pairs 12, 13 and 14, dielectric layer 17, M
a protective film 18 made of gO, a grid-like partition wall 19, a glass substrate 20 on the back side, a plurality of partition walls 25 extending in the vertical (Y) direction on the inner surface of the glass substrate 20, an address electrode 21 extending along the partition wall 25, And a phosphor 28 of a predetermined emission color, and the upper surface of the glass substrate 10 is a display screen HG in the figure.

For example, a mixed gas of neon and xenon is sealed in the internal discharge space 30, and the discharge space 30 is partitioned by partition walls 19 and 25 for each dot area g obtained by subdividing the display screen HG. Further, the phosphors 28 are arranged one by one with respect to each dot region g and arranged so that the emission colors of the respective phosphors 28 adjacent to each other in the extension direction of the address electrode 21 are different from each other.

Each discharge sustaining electrode pair 12 is a transparent electrode made of a Nesa film (tin oxide film) or an ITO film in order to increase display brightness. Each of the main discharge electrodes 13 and 14 has a line resistance value. A bus electrode (metal electrode) (not shown) is stacked to lower the voltage.

In the PDP 2 configured as described above, at the intersection of the main discharge electrode 13 and the address electrode 21 facing each other via the discharge space 30,
A selection discharge cell WC for an address for selecting each phosphor 28 is defined, and a selected phosphor 28 is caused to emit light at a portion of the main discharge electrodes 13 and 14 facing each other near the selection discharge cell WC. Of main discharge cells SC are defined. This allows
Each of the phosphors 28 corresponding to each dot region g can selectively emit light. However, in the PDP 2, multi-color display is performed for each pixel (pixel), so that one pixel is associated with a predetermined number (for example, four) of dot areas g, that is, a plurality of phosphors 28 of emission colors, The display color of the pixel is determined by the combination of the light emission of the phosphors 28.

For display, for example, first, a voltage exceeding the discharge start voltage is applied between the main discharge electrode 13 and the main discharge electrode 14 of each discharge sustaining electrode pair 12 to start line-by-line discharge. A discharge erase pulse is applied to the address electrode 21 corresponding to the main discharge SC unnecessary for display, and the dielectric layer
Discharge is stopped by erasing the 17 wall charges.

A discharge sustaining voltage lower than the discharge starting voltage is applied to the discharge sustaining electrode pair 12, and the main discharge cells SC corresponding to the display pixels continue to discharge. As a result, the phosphors 28 corresponding to the main discharge cells SC during the discharge are excited by the ultraviolet rays generated by the discharge to emit light. Then, the light emitted by the phosphor 28 passes through the discharge space 30, the glass substrate 10, and the like, and appears on the display screen HG.

[Problems to be solved by the invention]

When the display screen HG is large, such as in the case of performing public display, each pixel becomes large, and accordingly, the dot area g, which is the minimum unit area of light emission further dividing pixels, Also increases.

However, in the conventional PDP2, the selective discharge cell WC is defined only at one place in each dot area g.
The area where the discharge generated in the selected discharge cell WC spreads is relatively narrower than the dot area g, and it is difficult to reliably control the discharge generated in the main discharge cell SC.

For this reason, there is a problem that the screen display is likely to be disturbed, the display operation is unstable, and the display quality is low.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object to obtain a high-quality large-sized display screen with more stable light emission control and stable display operation.

[Means for solving the problem]

Plasma display panel 1 according to the invention of claim 1
A plurality of unit light emitting regions g provided with phosphors 28 that emit light by discharge, a plurality of discharge sustain electrode pairs 12 parallel to each other,
A plasma display panel having a selection electrode 22 that intersects each of the discharge sustaining electrode pairs 12, and configured to selectively emit light from the phosphors 28.
Numeral 12 indicates that the unit light-emitting region g is formed by generating a surface discharge that is elongated in the extension direction, and the selection electrode 22 is provided for each of the unit light-emitting regions g by being divided into a plurality.

The plasma display panel 1b according to the invention of claim 2
The discharge sustaining electrode pair 12 generates a unit light emitting region g by generating an elongated surface discharge in the extension direction, and the selection electrode 24 has a wide portion 24b facing almost the entire region of each unit light emitting region g, Three or more phosphors 28a, 28b, and 28c are provided on the wide portion in each unit light emitting region at intervals in the direction in which the discharge sustain electrode pair 12 extends.

The plasma display panel 1 according to the invention of claim 3,
1b, 1b, as shown in FIG. 1 to FIG.
The selected discharge cells WC for controlling the discharge of the main discharge cells SC that emits light 8 are defined at a plurality of locations in each unit light emitting region g.

(Operation)

A plurality of selective electrodes 22 are provided for each unit light emitting region g formed by the pair of discharge sustaining electrodes and generating a surface discharge elongated in the longitudinal direction.

In addition, a plurality of phosphors 28a, 28b, 28c are provided on the wide portion 24b opposed to substantially the entire unit light emitting region g of the selection electrode 24 at intervals in the extending direction of the discharge sustaining electrode pair 12.

In each unit light emitting region g, at a plurality of intersections where the selection electrode 22, or the selection electrode 24 and the sustain electrode pair 12 intersect,
Selective discharge cells WC for controlling light emission of phosphors 28, 28a, 28b, 28c, respectively, are defined.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a partial perspective view of a PDP 1 according to the present invention, FIG. 2 is a partial perspective view showing another embodiment of the present invention, and FIG. 3 is a partial perspective view showing still another embodiment of the present invention. . In these drawings, components having the same functions as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 1, a PDP 1 includes a glass substrate 10 on the display side, a plurality of pairs of discharge sustaining electrodes 12 including a pair of main discharge electrodes 13 and 14 extending in the horizontal (X) direction, and a dielectric layer made of low melting point glass.
17, a protective film 18 made of MgO, a grid-like partition wall 19, a glass substrate 20 on the back side, a plurality of partition walls 25 extending in the vertical (Y) direction, an address electrode 22, and a phosphor 28 of a predetermined emission color. It is configured. In the figure, the upper surface of the glass substrate 10 is the display screen HG.

For example, a mixed gas of neon and xenon is sealed in the internal discharge space 30, and the discharge space 30 is partitioned by partition walls 19 and 25 for each dot area g obtained by subdividing the display screen HG.

On the display screen HG, four dot areas g arranged in the vertical direction are defined as one pixel (pixel) in the display.
The size of one pixel is about 3 mm x 2.4 mm. Therefore, the size of one dot area g is 0.75
It will be about mm × 2.4mm.

In the PDP 1, the strip-shaped address electrodes 22 are formed by partition walls 25 and partition walls 25.
Are provided two each. That is, the address electrodes 22 are arranged so as to pass through one end and the center in the horizontal direction of each dot region g. These two address electrodes 22 are integrated by a connecting portion 22s at the periphery of the glass substrate 20. Has been electrically common.
That is, the address electrodes 22 are provided in such a manner as to be divided into two for each dot area g. The address electrode 22 and the connecting portion 22s are formed of, for example, a three-layer metal thin film (thickness of 5000 to 10,000) laminated in the order of chromium, copper, and chromium.
Ii) is formed by patterning using photolithography.

Further, on the glass substrate 20, a phosphor 28 of a predetermined emission color is provided for each of the dot regions g in such a manner as to be divided into two so that the address electrodes 22 are exposed to the discharge space 30. .

In the PDP 1 configured as described above, in the dot area g, two address electrodes commonly connected to one main discharge electrode 13 of the pair of sustain electrodes 12 arranged so as to pass through the center in the vertical direction. A selected discharge cell WC is defined at each intersection where each of the 22 intersects via the discharge space 30. That is, the discharge generated in the main discharge cell SC defined at the opposing portions of the main discharge electrodes 13 and 14 is generated by the two selective discharge cells WC.
Will be controlled by Therefore, the size of the area where one selected discharge cell WC is responsible for the discharge control is almost half the size of the dot area g, and the emission of the phosphor 28 corresponding to the dot area g can be reliably controlled.

In FIG. 2, in the PDP 1a, a band-shaped address electrode 15 for selecting a dot area g to emit light in the display screen HG is provided with three dot areas g on the surface of the protective film 18 of the glass substrate 10 on the display side. Three dots are arranged for each dot area g so as to be divided. These three address electrodes 15 are integrated at a peripheral portion of the glass substrate 10 by a connecting portion 15s and are electrically connected in common.

In addition, on the surface of the glass substrate 20 on the back side, in order to prevent deterioration due to ion bombardment at the time of discharge in each dot region g, an interval is provided so as to avoid a portion facing each address electrode 15 and three dots are provided. Phosphors 28a, 28b, 28c of the same emission color are formed.

In the PDP 1a, the selected cell is located at the intersection of the main discharge electrode 13 and each address electrode 15 facing each other via the dielectric layer 17 and the protective film 18.
Main discharge cell where WC is defined and defined in dot area g
The discharge of SC is controlled by three selected cells WC in the dot area g. That is, the size of the area where one selected discharge cell WC is responsible for the discharge control is almost one third of the dot area g.

In FIG. 3, in the PDP 1b, a glass substrate 20 on the rear side is used.
Is provided with an address electrode 24 having a wide portion 24b filling the space between the partition walls 25. And wide part 24
Above b, three phosphors 28a, 28b, 28c are arranged at intervals in the extending direction of the discharge sustaining electrode pair 12 for each of the dot regions g. A portion of the surface of the wide portion 24b that is not covered with the phosphor 28, that is, a discharge space
The exposed portion with respect to 30 has the function as an electrode.
A number of selected cells WC are defined.

Therefore, similar to the above-described PDP 1a, the main discharge cells SC
Is controlled by three selected cells WC, and the size of the area in which one selected discharge cell WC is in charge of the discharge is approximately one third of the dot area g.

According to the above-described embodiment, when forming the address electrodes 24, the patterning accuracy is relaxed as compared with the case where thin band-shaped electrodes are arranged at a predetermined pitch, so that the formation of the address electrodes 24 is easy, and the PDP 1b Can increase productivity.

In the above embodiment, two or three address electrodes 22, 15 electrically connected in common to each dot area g.
And the PDPs 1 and 1a defining two or three selective discharge cells WC in each dot area g are illustrated.
Four or more divided address electrodes may be arranged for each dot region g so as to define four or more selected discharge cells WC therein.

In the above-described embodiment, the plurality of address electrodes 22, 1
Although the common connection of 5 was made at the periphery of the glass substrates 20 and 10 by connecting portions 22s and 15s formed integrally with these address electrodes 22 and 15, the common connection of the address electrodes 22 and 15 was made by other means. It may be used at a single or a plurality of arbitrary locations. For example, the connection may be made by connecting external connection lead wires derived from the glass substrates 20 and 10, or by connection on a drive circuit for display.

In the above-described embodiment, the PDP 1a in which the discharge sustain electrode pair 12, the dielectric layer 17, the protective film 18, the address electrode 15, and the partition wall 19 are formed in this order on the surface of the display-side glass substrate 10 is exemplified. First, an address electrode 15 is formed on the surface of 10, and a discharge sustaining electrode pair 12 can be formed thereon via an insulating layer.

In the above embodiment, the discharge space 30 is defined between the address electrodes 22 and the phosphors 28, between the address electrodes 15, or between the exposed portions of the address electrodes 24 and the phosphors 28a, 28b, 28c. May be provided. In addition, the shape and size of the dot area g, and the position where the selected discharge cell WC is defined in the dot area g can be appropriately changed.

In the above-described embodiment, the PDP 1, 1a, 1b provided with the phosphors 28, 28a, 28b, 28c of a plurality of emission colors for multi-color display is exemplified. Surface discharge type PD provided
The present invention can also be applied to P. In that case, one dot area g becomes one pixel in display.

〔The invention's effect〕

ADVANTAGE OF THE INVENTION According to this invention, control of light emission of a fluorescent substance becomes more reliable, and it becomes possible to perform high quality color display with stable display operation on a large display screen.

[Brief description of the drawings]

 Fig. 1 is a partial perspective view of a PDP according to the present invention, Fig. 2 is a partial perspective view showing another embodiment of the present invention, Fig. 3 is a partial perspective view showing still another embodiment of the present invention, FIG. 4 is a partial perspective view of a conventional surface discharge type PDP. In the figure, 1,1a and 1b are PDPs (plasma display panels), 12 is a pair of sustaining electrodes, 15, 22, and 24 are address electrodes (selection electrodes), 24b is a wide section, and 28, 28a, 28b, and 28c are fluorescent light. HG is a display screen, g is a dot area (unit light emitting area), SC is a main discharge cell, and WC is a selective discharge cell.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masato Suzuki 1015 Uedanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (72) Inventor Mamoru Miyahara 1015 Ueodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Fujitsu Limited ( 56) References JP-A-59-141147 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 11/00-11/02

Claims (3)

(57) [Claims] 1. A phosphor comprising: a plurality of unit light-emitting regions each including a phosphor emitting light by discharge; a plurality of pairs of discharge sustaining electrodes parallel to each other; and a selection electrode intersecting each pair of discharge sustaining electrodes. In the plasma display panel configured to selectively emit light, the discharge sustaining electrode generates a surface discharge that is elongated in an extending direction to form the unit light emitting region, and the selection electrode includes the unit light emitting region. A plasma display panel characterized by being divided into a plurality of pieces. 2. A phosphor comprising: a plurality of unit light-emitting regions each including a phosphor that emits light by discharge; a plurality of discharge sustain electrode pairs parallel to each other; and a selection electrode intersecting each discharge sustain electrode pair. In the plasma display panel configured to selectively emit light, the discharge sustaining electrode pair generates an elongated surface discharge in an extending direction to form the unit light emitting region, and the selection electrode includes the unit light emitting unit. A wide portion opposed to substantially the entire region, and three or more phosphors are provided on the wide portion in each of the unit light emitting regions at intervals from each other in a direction in which the discharge sustaining electrode pairs extend. A plasma display panel characterized by the above-mentioned. 3. A plasma display panel configured to selectively emit a phosphor corresponding to each unit light-emitting region obtained by subdividing a display screen, wherein discharge of a main discharge cell for emitting each of the phosphors is performed. A plasma display panel, characterized in that selective discharge cells for controlling the voltage are defined at a plurality of locations in each of the unit light emitting regions.