JPH04218238A - Plasma display panel - Google Patents

Abstract

PURPOSE:To limit expansion of electric discharge, reduce power consumption and prevent incorrect display by localizing wall charge with reference to AC- type plasma display panel for segment display. CONSTITUTION:The plasma display panel 1 is constituted such that it is equipped with electrodes x, y<1>, y<2> covered with a dielectric 25 and a plurality of segments SE1, SE2 are made to selectively emit light, and the dielectric 25 is partitioned into the respective segments SE1, SE2 by an insulator 29 having the dielectric constant smaller than the dielectric 25.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AC type plasma display panel (PDP) that performs segment display.

[0002] Segment display type PDPs perform display by selectively emitting light from a plurality of segments provided on the display surface, and are often used to display numbers, alphabets, and the like.

0003

2. Description of the Related Art FIG. 3 is a plan view showing an example of a segment display screen HG, and FIG. 4 is a plan view showing an example of the electrode structure of the segment group 7S in FIG.

[0004] On the segment display screen HG, seven segments 7a are arranged in a figure 8 shape to display numbers.
Display is performed using a segment group 7S consisting of 7g and a segment PS for displaying a decimal point.

[0005] As shown in FIG. 4, power is supplied to the segment group 7S through a common electrode The selection electrodes Ya to Yg respectively correspond to the selection electrodes 7g.

[0006] The common electrode X and the selection electrodes Ya to Yg are patterned in a comb shape in each of the discharge portions 8a to 8g, and the comb teeth of the common electrode X and the comb teeth of each selection electrode Ya to Yg are arranged alternately. They are arranged in close proximity to each other. As a result, uniform discharge occurs within each region of each of the discharge portions 8a to 8g, and the display brightness within each segment 71 to 77 becomes uniform.

FIG. 5 is a diagram schematically showing the structure of a conventional PDP 1j. FIG. 5(a) is a cross-sectional view of the PDP 1j, and FIG. 5(b) is a plan view of the PDP 1j.

[0008] The PDP 1j is a surface discharge type AC (alternating current)
type PDP, which includes a pair of glass substrates 11 and 21 facing each other with a discharge gap 30 interposed therebetween, a phosphor 18 of a predetermined emission color,
A light shielding layer 19 provided to surround the phosphor 18, a common electrode branch x branched from the common electrode X, and selection electrode branches y1, y2.
, a dielectric layer 25j made of low melting point glass, and a protective film 26 made of magnesium oxide. The discharge gap 30 is filled with a discharge gas containing a mixture of neon and xenon. Note that in FIG. 5(b), the dielectric 25
j and the protective film 26 are omitted from the illustration.

The upper surface of the glass substrate 11 in FIG. 5 becomes the segment display screen HG, and the two phosphors 18 shown in FIG. 5(a) correspond to the segments SE1 and SE2, respectively. In other words, the regions where the phosphors 18 are provided become segments SE1 and SE2 as unit light emitting regions for display.

The common electrode branch x and the selection electrode branch y1, and the common electrode branch x and the selection electrode branch y2 are arranged alternately on the opposing surfaces of the phosphor 18, respectively. A glass substrate 21 provided with these electrode branches x, y1, y2 and a common electrode
The entire surface of is uniformly covered with a dielectric material 25j.

When displaying on the PDP 1j, for example, a voltage exceeding a discharge starting voltage is applied between the common electrode branch x and the selection electrode branch y1 to generate a discharge. As a result, the phosphor 18 corresponding to the segment SE1 is excited by the ultraviolet rays generated within the discharge gap 30 and emits light.

When a discharge occurs, wall charges are accumulated on the common electrode branch x and the selective electrode branch y1 in the dielectric layer 25j. Therefore, hereinafter, a well-known method for driving an AC type PDP will be used. By applying an alternating current discharge sustaining voltage having a peak value lower than the discharge starting voltage, the display can be continued by repeatedly causing discharge.

[0013]

Generally speaking, in an AC type PDP that utilizes wall charges for recurrence of discharge, the dielectric constant (relative dielectric constant) of the dielectric layer is selected to a value of about 13 to 14.

[0014] Therefore, in the conventional PDP 1j, there was a problem in that wall charges were accumulated over a wide range, and the area where discharge occurred was excessively large with respect to the segments SE1 and SE2. That is, as shown in FIG. 5, when the common electrode X is wired near the selection electrode branch y1, discharge may also occur between the common electrode X and the selection electrode branch y1.

[0015] If the discharge area becomes too large, power will be wasted during display, and if the discharge area extends to non-display segments, the non-display segments will emit light, resulting in incorrect display. Become.

In order to solve this problem, it is conceivable to provide partition walls to partition the discharge gap 30 into segments, for example. However, in order to form barrier ribs of sufficient height, it is necessary to repeat the application of the barrier rib material many times by screen printing, which significantly increases the manufacturing cost of the PDP.

In view of the above-mentioned problems, the present invention aims to limit the spread of discharge by localizing wall charges, thereby reducing power consumption and preventing erroneous display.

[0018]

[Means for solving the problems] A PDP according to the present invention includes:
In order to solve the above problems, as shown in FIG. 1, a plasma display is provided which has electrodes x, y1, and y2 covered with a dielectric material and is configured to selectively emit light from a plurality of segments SE1 and SE2. The panel 1 is an insulator 2 in which the dielectric 25 has a lower permittivity than the dielectric 25.
Each of the segments SE1 and SE2 is partitioned by 9.

[0019]

[Operation] Between electrode x and electrode y1, or between electrode x and electrode y
When a discharge occurs between the dielectric material 25 and the dielectric material 25, wall charges are accumulated on the dielectric material 25.

Since the dielectric 25 is partitioned into the segments SE1 and SE2 by the insulator 29, the area where wall charges accumulate is almost limited to the range of the segments SE1 and SE2.

[0021]

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

FIG. 1 is a cross-sectional view schematically showing the structure of a PDP 1 according to the present invention, and FIG. 2 is a plan view schematically showing the structure of the PDP 1 according to the present invention.

In FIGS. 1 and 2, components having the same functions as those in FIG. 5 are given the same reference numerals, and components corresponding to FIG. , the description of each of these components will be omitted or simplified.

[0024] The PDP 1 has a pair of glass substrates 11 and 21.
, phosphor 18, light shielding layer 19, common electrode X and common electrode branch x
, selection electrode branches y1, y2, dielectric layer 25, insulator layer 29
, a protective film 26, and the like. In FIG. 2, the area where the dielectric layer 25 is formed is shaded, and the area where the protective film 25 is formed is shaded.
6 is omitted from illustration.

A feature of the PDP 1 is that the dielectric layer 25 does not cover the entire surface of the glass substrate 21, but the dielectric layer 25 covers the phosphors 18 (that is, the segments SE1,
SE2) is provided so as to be divided into islands, and an insulating layer 29 is provided so as to surround each of these dielectric layers 25. That is, in the PDP 1, the dielectric layer 25 is partitioned into segments SE1 and SE2 by the insulating layer 29.

The dielectric constant of the insulating layer 29 is selected to be, for example, about 10 or less, which is smaller than the dielectric constant of the dielectric layer 25 (about 13 to 14 as described above).

With this, for example, when a predetermined voltage is applied between the common electrode branch x and the selection electrode branch y1 to cause a discharge in order to cause the segment SE1 to emit light, the amount of wall charge accumulated is large. The range is segment SE1
It is limited to the formation region of the dielectric layer 25 corresponding to . That is, wall charges are localized within segment SE1.

Therefore, the spread of the discharge to the outside of the segment SE1 is suppressed, power consumption due to unnecessary discharge is eliminated, and erroneous display such as the adjacent segment SE2 emitting light even though it is a non-display segment is prevented. Prevented.

The dielectric layer 25 and the insulating layer 29 are each formed by screen printing of low melting point glass. At this time, the low melting point glass used for forming the insulating layer 29 has a larger amount of inorganic filler (for example, alumina) mixed therein than the low melting point glass used for forming the dielectric layer 25 in order to reduce the dielectric constant. do.

According to the embodiment described above, since the common electrode X is covered with the insulator 29, discharge between the common electrode X and the selection electrode branches y1 and y2 is suppressed. Therefore, the degree of freedom in setting the potential of the common electrode X increases, and the PDP1
drive control becomes easy.

According to the above-described embodiment, since the discharge region almost coincides with the segments SE1 and SE2, the light shielding layer 1
Since the discharge gas does not emit light below 9, the light shielding layer 1
Even if light shielding is insufficient because layer 9 is thin, light will not leak from light shielding layer 19 to display screen HG. Therefore, high-quality display with clear outlines of segments SE1 and SE2 is possible.

In the above-described embodiment, the formation region of the dielectric layer 25 and the segments SE1 and SE2 are aligned with each other.
Although DP1 is shown as an example, the size of the formation region of the dielectric layer 25 can be appropriately set depending on the arrangement relationship of the segments SE1 and SE2, the applied voltage, and the like. Further, the dielectric constants of the dielectric layer 25 and the insulating layer 29 are not limited to the above values.

[0033]

According to the present invention, unnecessary spread of discharge can be suppressed by localizing wall charges, thereby reducing power consumption and preventing erroneous display.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view schematically showing the structure of a PDP according to the present invention.

FIG. 2 is a plan view schematically showing the structure of a PDP according to the present invention.

FIG. 3 is a plan view showing an example of a segment display screen.

FIG. 4 is a plan view showing an example of the electrode structure of the segment group in FIG. 3;

FIG. 5 is a diagram schematically showing the structure of a conventional PDP.

[Explanation of symbols]

1 PDP (plasma display panel) SE1,
SE2 Segment x Common electrode branch (electrode) y1, y2 Selective electrode branch (electrode) 25 Dielectric layer (dielectric) 29 Insulator layer (insulator)

Claims (1)

[Claims] Claim 1: An electrode (x) covered with a dielectric (25) (
y1)(y2) and multiple segments (SE1)(
A plasma display panel (1) configured to selectively emit light from the dielectric (SE2), the plasma display panel (1) comprising:
5) is connected to each segment (SE1) (SE2) by an insulator (29) having a lower permittivity than the dielectric (25).
) A plasma display panel characterized by being partitioned into sections.