WO2002045115A1

WO2002045115A1 - Color plasma display panel with an improvement of color temperature and brightness

Info

Publication number: WO2002045115A1
Application number: PCT/KR2001/002051
Authority: WO
Inventors: Jeong-Sik Choi
Original assignee: Orion Electric Co., Ltd.
Priority date: 2000-11-28
Filing date: 2001-11-28
Publication date: 2002-06-06

Abstract

The present invention provides a color plasma display panel with an improvement of color temperature and brightness. The color plasma display panel comprises black stripes or barrier ribs 8 containing at least one of dyes to reveal a blue color, dyes having an NIR-blocking function and dyes to absorb an orange color used for improving color purity and color temperature of a red color, or dye layers formed on the black stripes or the barrier ribs and color temperature of a red color, or dye layers formed on the black stripes or the barrier ribs.

Description

COLOR PLASMA DISPLAY PANEL WITH AN IMPROVEMENT OF COLOR

TEMPERATURE AND BRIGHTNESS

Technical Field

The present invention relates to a color plasma display

panel with an improvement of color temperature and brightness, and

more particularly, to a color plasma display panel which has a

filter function in the black stripes so- as to improve color

temperature of a white color by making brightness of a blue color

higher, so as to enable a function for preventing an NIR without a

front plate using reinforced glass or acryl substrate etc. , and/or

so as to improve color purity and color temperature of a red

color.

Background Art

In general, a plasma display panel is divided into two

kinds of an AC-type and a DC-type. In the AC-type plasma display

panel, electrodes in discharge spaces within the panel are covered

by dielectric layers and discharging charges are rounded on the

dielectric layers, thereby being called an alternative current

type or an AC type. In driving the AC-type plasma display panel, a screen is continuously radiated by a memory function of the wall

charge on the dielectric layers due to display pulses. Meanwhile,

in the DC-type plasma display panel, the electrodes within the

panel are exposed in the discharging space and discharging charges

flow into an exterior circuit through the electrodes. Thus, the

plasma display panel of this type is called a direct current type

or a DC type and, in driving the DC-type plasma display panel, a

memory function of display pulses are performed by floating

charges within the discharging space.

In conventional AC plasma display panels, there are known a

dual-electrode plasma display panel in which a selection(address)

discharge and a sustain discharge are performed between two

electrodes, and a triple-electrode plasma display panel in which

an address discharge is performed using three electrodes. In a

color plasma display panel for multi-step display gradations,

phosphors in each cell are excited by an ultraviolet ray radiated

by the discharge. But, there is a disadvantage that phospors are

very week against impact of positive ions simultaneously generated

during the discharge. In the dual-electrode plasma display panel,

phosphors are constructed so as to be impinged directly against the ions, thereby being apprehensive of shortening the life of the

phosphors. Accordingly, in the color plasma display panel, the

triple-electrode plasma display panel using a surface discharge

(that is, a surface-discharge type AC plasma display panel) is

generally used.

In FIG. 1, a construction of a conventional

triple-electrode color plasma display panel is shown as a

schematic partial section of one discharge cell or one display

cell, and in FIG. 2, a waveform chart for operating it is shown.

As shown in FIG. 1, the plasma display panel comprises a front

substrate 1, wherein the front substrate 1 is provided with a

front electrode group consisting of X electrodes 3 and Y

electrodes 4 as transparent electrodes, and a dielectric layer 6

formed thereon. And a rear substrate 2 faced parallel to the front

substrate 1 is provided with address electrodes 5 as data

electrodes, a dielectric layer 7 formed thereon, barrier ribs 8

formed on the rear dielectric layer so as to form a plurality of

cells of discharge spaces between the front substrate 1 and the

rear substrate 2 and phosphor layers 9 formed between each barrier

ribs 5. The X electrodes 3 and the Y electrodes 4 comprise ITO electrodes so as not to obstruct the light transmission in the

front substrate 1, and bus electrodes 3' and 4' as metal

electrodes of a narrower width than the ITO electrodes so as to

prevent a voltage drop. And, the phosphor layers 9 of R, G and B

form display cells as to each of the R, G, B phosphors with shapes

of stripes or delta, etc. , and, as shown in Fig. 1, black stripes

3" and 4" are provided on the front substrate 1 in order to

improve the contrast of the R, G and B in color.

In a driving method of such a plasma display panel, there

are two kinds, i.e., a separate address/sustain discharge method

(disclosed on the Japanese Patent Laid-open No. H4-l,951,880) and

a multiple-address/sustain discharge method (disclosed on the

Japanese Patent No. 2,528,195). However, the separate

address/sustain discharge method is mainly adopted, wherein, as

shown in Fig. 2, one field (frame) is divided into, for example, a

first to an eighth subfields (subframes) and each subframe

comprises a reset period, an address period and a sustain period;

each sustain period is set to have a different sustain period; and

then, a gray scale display of an image screen is obtained by

combining each subfield of a different sustain period. During the reset period, wall charges of the dielectric

layers 6, etc. , are initialized in each subfield, and during the

address period after the reset period, selective writing

discharges (address discharges) of display data are performed in

cells to be selected. Then, during the sustain period, sustain

discharges are repeatedly performed so as to display one subfield

by repeating display of radiation by the sustain discharge in the

selected display cells.

Circuits for the driving method in such a plasma display

panel have not been illustrated in view of such circuits being

well known within the skill of the prior art. For example, address

pulses for address discharges are applied to the address

electrodes 5 by an address driver, which is controlled by a

control circuit. Each of the Y electrodes 4 is connected to an Y

scan driver, which is connected to an Y side of a common driver.

Pulses for address discharges are generated by the scan driver,

and sustain pulses, etc. , are generated by the Y side of the

common driver, those pulses being applied to the Y electrodes 4

via the Y scan driver. The Y side of the common driver is

controlled by a controller for the common driver installed in a drive and control part of the panel and the Y scan driver is

controlled by a controller for the scan driver installed in a

drive and control part of the panel. Also, the X electrodes 3 are

connected to an X side of the common driver commonly in all

display lines of the plasma display panel, the X side of the

common driver generating writing pulses, suatain pulses, etc. , and

being controlled by the common driver controller. Such common

driver controller, the scan driver controller and control circuits

are controlled by the horizontal synchronizing signal and the

vertical synchronizing signal inputted from the outside of the

panel to the drive and control part of the panel, display data

signals inputted to the display data control part and a clock. In

addition, the display data signals inputted according to the clock

are stored in a frame memory.

Also, the AC color plasma display panel of a face discharge

type explained as an example may comprise a front plate 10 which

is attached to the front face of the front substrate 1, being

formed of reinforced glass or acryl substrate, etc. , provided with

coating layer(s) 11 as a functional film, an EMI film, an

anti-reflective film, etc. , as shown in Fig. 1 so as to improve an optical characteristic and to prevent EMI, reflection, etc.

SUMMARY OF THE INVENTION

However, there is one problem in the phosphor layers 9 that

a color temperature becomes lower due to the lower brightness of

the blue phosphor among the R, G, B phosphors. Thus, the screen

looks reddish or greenish in a white color display, causing

difficulty in realizing the true white color.

Further, there are different problems in the front

substrate 1 with the above-mentioned front plate 10 that the front

plate 10 with the coating layer(s) 11 lowers the transmission rate

of the front substrate 1 and the front substrate 1 costs higher

due to multiple films. Also, although the coating layer(s) 11 such

as a functional film, an EMI film, an anti-reflective film, etc. ,

are directly applied to the front substrate 1, the transmission

rate of the front substrate 1 will be lowered similarly. And some

separate processes are required and have some effects on the other

processes during the manufacturing process of the front substrate

1 and the rear substrate 2. Thus, there is one problem that the

direct application is not easy.

Accordingly, in order to the above discussed problems, the present invention provides a color plasma display panel with, an

improvement of color temperature and brightness which can improve

color temperature of a white color by making the brightness of a

blue color higher, and/or which can enable a function for

preventing an NIR without a front plate using reinforced glass or

acryl substrate etc. , and/or which can improve color purity and

color temperature of a red color.

To achieve the above-mentioned object, in accordance with

one embodiment of the present invention, there is provided a color

plasma display panel with an improvement of color temperature and

brightness, wherein said color plasma display panel comprises a

front substrate and a rear substrate, at least multiple electrodes

being formed on the front substrate, multiple address electrodes

being formed on the rear substrate opposite to the multiple

electrodes so as to form multiple display cells(discharge cells)

in crossing regions with the multiple electrodes, R, G, B,

phosphor layers being formed so as to display images by discharges

between the multiple electrodes and the multiple address

electrodes, and multiple black stripes being formed so as to

improve a contrast characteristic of the R, G, B phosphor layers. said color plasma display panel being characterized in that said

black stripes additionally include at least one selected from a

group, which is consisted of dyes to reveal a blue color, dyes

having an NIR-blocking function and dyes to absorb an orange color

used for improving color purity and color temperature of a red

color, thereby improving color temperature and/or brightness, or

being characterized in that dye layers containing at least one of

dyes to reveal a blue color, dyes having an NIR-blocking function

and dyes to absorb an orange color used for improving color purity

and color temperature of a red color are formed on said black

stripes. Wherein said plasma display panel comprises barrier ribs,

it is preferred that at least one portion of said barrier ribs

contains at least one of dyes to reveal a blue color, dyes having

an NIR-blocking function and dyes to absorb an orange color used

for improving color purity and color temperature of a red color,

or dye layers containing at least one of dyes to reveal a blue

color, dyes having an NIR-blocking function and dyes to absorb an

orange color used for improving color purity and color temperature

of a red color are formed on at least one portion of said barrier

ribs. Also, the present invention may comprise the combination of the above-mentioned constructions.

Brief Description of the Drawings

Fig. 1 is a schematic partial section for explaining a

construction of a conventional triple-electrode color plasma

display panel.

Fig. 2 is a waveform chart for explaining a conventional

method of operating the triple-electrode color plasma display

panel.

Fig. 3 is a schematic partial section, similar to Fig. 1,

in which one embodiment of the present invention is applied to a

triple-electrode color plasma display panel.

Fig. 4 is a schematic partial section, similar to Fig. 1,

in which another embodiment of the present invention is applied to

a triple-electrode color plasma display panel.

Fig. 5 is a schematic partial section, similar to Fig. 1,

in which further another embodiment of the present invention is

applied to a triple-electrode color plasma display panel.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Now, preferred embodiments of the present invention will be

described in detail with reference to the accompanying drawings hereinafter.

In Fig. 3, a schematic partial section is shown in which

one embodiment of the present invention is applied to a

triple-electrode color plasma display panel.

In Fig. 3, a color plasma display panel in accordance with

one embodiment of the present invention is constructed similarly

to the conventional construction. That is, X electrodes 3, Y

electrodes 4 and black stripes 3" and 4" are formed on a front

substrate 1, a dielectric layer 6 being formed thereon. Also,

address electrodes 5 is formed on a rear substrate 2 opposite to

the front substrate 1 and a dielectric layer 7 is formed thereon.

Barrier ribs 8 are formed on the dielectric layer 7 so as to form

a plurality of cells of discharge spaces between the front

substrate 1 and the rear substrate 2, and R, G, B phosphor layers

9 are formed between each barrier ribs 8. Further, the X

electrodes 3 and the Y electrodes 4 comprise ITO electrodes so as

not to obstruct the light transmission in the front substrate 1,

and bus electrodes 3' and 4' as metal electrodes of a narrower

width than the ITO electrodes so as to prevent a voltage drop.

In Fig. 3, black stripes 13 and 14 are formed on the front substrate 1 in one shape of a stripe or a matrix, etc. , in

accordance with the prior art with a mixture of the prior black

stripe material and at least one of dyes to reveal a blue color,

dyes having an NIR-blocking function and dyes to absorb an orange

color used for improving color purity and color temperature of a

red color.

By adding dyes to reveal a blue color to the black stripes

13 and 14 as stated above, brightness of B phosphor having the

lowest brightness among R, G, B phosphors is compensated when the

plasma display panel is radiated due to the discharge, thus it is

prevented that the screen looks reddish or greenish in a white

color display in the prior art, and therefore, it becomes possible

to realize a true white color. Accordingly, an improvement of

color temperature can be obtained.

Furthermore, by adding dyes having an NIR-blocking function

and/or dyes to absorb an orange color used for improving color

purity and color temperature of a red color to the black stripe

forming material, and then forming the black stripes 13 and 14

with the dye-added material, the NIR-blocking function can be

obtained, and color purity and color temperature of a red color can be improved, by means of the addition at the lower

manufacturing cost without the above-mentioned front plate 10

shown in Fig. 1. Also, large improvement of brightness can be

obtained because there is no front plate 10 and films are not

formed in the direction of the central reflection in display

cells. Furthermore, by forming films of an EMI function or an

anti-reflection function on the front substrate 1 within a field

of vision, all functions of the prior art front plate 10

comprising an EMI function or an anti-reflection function can be

ultimately obtained although the prior art front plate 10 is

removed.

In Fig. 4, a schematic partial section is shown in which

another embodiment of the present invention is applied to a

triple-electrode color plasma display panel.

The structure in Fig. 4 is almost the same as in Fig. 3.

The difference is that, in Fig. 4, filter layers or dye layers 23

and 24 are formed on said black stripes 3" and 4", said filter

layers or dye layers 23 and 24 containing at least one of dyes to

reveal a blue color, dyes having an NIR-blocking function and dyes

to absorb an orange color used for improving color purity and color temperature of a red color.

In such a construction, the black stripes 3" and 4" are

formed as in the conventional construction, and the dye layers 23

and 24 are separately formed on the black stripes 3" and 4", thus

the similar effects along with the lower manufacturing cost can be

obtained in the similar manner to that in the above-mentioned

black stripes 13 and 14 to contain dyes in Fig. 3. That is, by

forming the dye layers of a blue color as stated above, brightness

of B phosphor having the lowest brightness among R, G, B phosphors

is compensated when the plasma display panel is radiated due to

the discharge. Thus it is prevented that the screen looks reddish

or greenish in a white color display as in the prior art, and

therefore, it becomes possible to realize the true white color.

Accordingly, an improvement of color temperature can be obtained.

Furthermore, where dyes for an NIR-blocking function is

contained, the NIR-blocking function can be obtained, and where

dyes to absorb an orange color used for improving color purity and

color temperature of a red color, color purity and color

temperature of a red color can be improved. Also, brightness can

be largely improved because there is no front plate 10 and films are not formed in the direction of the central reflection in

display cells. Furthermore, by forming films of an EMI function or

an anti-reflection function on the front substrate 1 within a

field of vision, all functions of the prior art front plate 10

comprising an EMI function or an anti-reflection function can be

ultimately obtained although the prior art front plate 10 is

removed, as stated in the above-mentioned embodiment.

Meanwhile, even in this case, i. e. , even where dye layers

23 and 24 are formed, as not shown, the black stripes 3" and 4"

can be formed of a light-absorbing material as the prior black

stripe material which additionally includes at least one of dyes

to reveal a blue color, dyes having an NIR-blocking function and

dyes to absorb an orange color used for improving color purity and

color temperature of a red color, as stated above. Thus, this

construction can create still more effects.

In Fig. 5, a schematic partial section is shown in which

still another embodiment of the present invention is applied to a

the triple-electrode AC color plasma display panel of a face

discharge type.

In Fig. 5, dye layers 29 are formed on at least one portion of an exterior surface in said barrier ribs 28, said dye layers 29

also containing at least one of dyes to reveal a blue color, dyes

having an NIR-blocking function and dyes to absorb an orange color

used for improving color purity and color temperature of a red

color.

By forming the dye layers 29 on the exterior surface of the

barrier ribs 28 as above, it can be prevented that a white color

display looks reddish or greenish in the prior art, the

NIR-blocking function can be obtained, and/or color purity and

color temperature of a red color can be improved. Also, brightness

can be largely improved because there is no front plate 10 and

films are not formed in the direction of the central reflection in

display cells, similarly to the effect in the above-mentioned

embodiments.

Where the barrier ribs are formed in a dual structure

comprising black barrier ribs, the dye layers 29 can be formed

instead of the black barrier ribs.

Also, as in the above-mentioned construction wherein black

stripes 13 and 14 additionally contain at least one of dyes to

reveal a blue color, dyes having an NIR-blocking function and dyes to absorb an orange color used for improving color purity and

color temperature of a red color, barrier ribs 8 can be formed so

as to additionally contain at least one of dyes to reveal a blue

color, dyes having an NIR-blocking function and dyes to absorb an

orange color used for improving color purity and color temperature

of a red color.

Furthermore, it is possible to be constructed in

combination of the above-mentioned constructions, thereby being

expected to result in still larger effects.

In the above embodiments, the principles of the present

invention have been illustrated and explained with particular

regard to the structures applied to the triple electrode type, but

the present invention can be also applied to a dual-electrode

type, or it makes no difference to apply the present invention to

an AC type and a DC type in a color plasma display panel.

In addition, the term of stripes in the above-mentioned

black stripes 13 and 14 may be replaced by a matrix without any

limitation to the stripe structure as a meaning of what is simply

formed with a light-absorbing material.

According to the construction and its acting effect of the color plasma display panel with an improvement of color

temperature and brightness in the above preferred embodiments of

the present invention, it can be prevented that, in the prior art,

the screen looks reddish or greenish in a white color display, the

NIR-blocking function can be obtained, and/or color purity and

color temperature of a red color can be improved by additionally

containing in black stripes or barrier ribs, and/or forming dye

layers with, at least one of dyes to reveal a blue color, dyes

having an NIR-blocking function and dyes to absorb an orange color

used for improving color purity and color temperature of a red

color. Also, brightness can be largely improved because there is

no front plate 10 and films are not formed in the direction of the

central reflection in display cells, and the present invention

also has other undescribed effects.

Claims

CLAIMS :

1. In a color plasma display panel comprising a front substrate 1

and a rear substrate 2, at least multiple electrodes (X electrodes

and/or Y electrodes) being formed on the front substrate 1,

multiple address electrodes 5 being formed on the rear substrate 2

opposite to the multiple electrodes so as to form multiple display

cells (discharge cells) in crossing regions with the multiple

electrodes, R, G, B phosphor layers 9 being formed so as to

display images by discharges between the multiple electrodes (X

electrodes and/or Y electrodes) and the multiple address

electrodes 5, and multiple black stripes being formed so as to

improve a contrast characteristic of the R, G, B phosphor layers

9, said color plasma display panel being characterized in that

said black stripes 13 and 14 additionally include at least one of

a group which is consisted of dyes to reveal a blue color, dyes

having an NIR-blocking function and dyes to absorb an orange color

used for improving color purity and color temperature of a red

color, thereby improving color temperature and/or brightness.

2. A color plasma display panel with an improvement of color

temperature and brightness according to claim 1, wherein barrier ribs 8 are provided between the front substrate 1 and the rear

substrate 2 so as to provide discharge spaces filled with

discharge gas, said color plasma display panel being characterized

in that at least one portion of said barrier ribs 8 contains at

least one of dyes to reveal a blue color, dyes having an

NIR-blocking function and dyes to absorb an orange color used for

improving color purity and color temperature of a red color.

3. A color plasma display panel with an improvement of color

temperature and brightness according to claim 1, wherein barrier

ribs 28 are provided between the front substrate 1 and the rear

substrate 2 so as to provide discharge spaces filled with

discharge gas, said color plasma display panel being characterized

in that dye layers 29 containing at least one of dyes to reveal a

blue color, dyes having an NIR-blocking function and dyes to

absorb an orange color used for improving color purity and color

temperature of a red color are formed on at least one portion of

said barrier ribs 28.

4. In a color plasma display panel comprising a front substrate 1

and a rear substrate 2, at least multiple electrodes (X electrodes

and/or Y electrodes) being formed on the front substrate 1, multiple address electrodes 5 being formed on the rear substrate 2

opposite to the multiple electrodes (X electrodes and/or Y

electrodes) so as to form multiple display cells (discharge cells)

in crossing regions with the multiple electrodes, R, G, B phosphor

layers 9 being formed so as to display images by discharges

between the multiple electrodes X and/or Y and the multiple

address electrodes 5, and multiple black stripes (3", 4") being

formed so as to improve a contrast characteristic of the R, G, B

phosphor layers 9, said color plasma display panel being

characterized in that filter layers 23 and 24 containing at least

one of dyes to reveal a blue color, dyes having an NIR-blocking

function and dyes to absorb an orange color used for improving

color purity and color temperature of a red color are formed on

said black stripes 3" and 4".

5. A color plasma display panel with an improvement of color

temperature and brightness according to claim 4, wherein barrier

ribs 8 are provided between the front substrate 1 and the rear

substrate 2 so as to provide discharge spaces filled with

discharge gas, said color plasma display panel being characterized

in that at least one portion of said barrier ribs 8 contains at least one of dyes to reveal a blue color, dyes having an

NIR-blocking function and dyes to absorb an orange color used for

improving color purity and color temperature of a red color.

6. A color plasma display panel with an improvement of color

temperature and brightness according to claim 4, wherein barrier

ribs 28 are provided between the front substrate 1 and the rear

substrate 2 so as to provide discharge spaces filled with

discharge gas, said color plasma, display panel being characterized

in that dye layers 29 containing at least one of dyes to reveal a

blue color, dyes having an NIR-blocking function and dyes to

absorb an orange color used for improving color purity and color

temperature of a red color are formed on at least one portion of

said barrier ribs 28.

7. In a color plasma display panel comprising a front substrate 1

and a rear substrate 2, at least multiple electrodes (X electrodes

and/or Y electrodes) being formed on the front substrate 1,

multiple address electrodes 5 being formed on the rear substrate 2

opposite to the multiple electrodes (X electrodes and/or Y

electrodes) so as to form multiple display cells (discharge cells)

in crossing regions with the multiple electrodes, R, G, B phosphor layers 9 being formed so as to display images by discharges

between the multiple electrodes and the multiple address

electrodes 5, and barrier ribs 8 being provided between the front

substrate 1 and the rear substrate 2 so as to provide discharge

spaces filled with discharge gas, said color plasma display panel

being characterized in that at least one portion of said barrier

ribs 8 contains at least one of dyes to reveal a blue color, dyes

having an NIR-blocking function and dyes to absorb an orange color

used for improving color purity and color temperature of a red

color.

8. In a color plasma display panel comprising a front substrate 1

and a rear substrate 2, at least multiple electrodes (X electrodes

and/or Y electrodes) being formed on the front substrate 1,

multiple address electrodes 5 being formed on the rear substrate 2

opposite to the multiple electrodes so as to form multiple display

cells (discharge cells) in crossing regions with the multiple

electrodes, R, G, B phosphor layers 9 being formed so as to

display images by discharges between the multiple electrodes and

the multiple address electrodes 5, and barrier ribs 28 being

provided between the front substrate 1 and the rear substrate 2 so as to provide discharge spaces filled with discharge gas, said

color plasma display panel being characterized in that dye layers

29 containing at least one of dyes to reveal a blue color, dyes

having an NIR-blocking function and dyes to absorb an orange color

used for improving color purity and color temperature of a red

color are formed on at least one portion of said barrier ribs 28.