KR100811604B1 - Plasma Display Apparatus - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device, wherein a light shielding pattern is formed in an image filter, and xenon (Xe) is included in a discharge cell of a plasma display panel by 12% or more and 30% or less. There is an effect of improving the contrast characteristics and at the same time improving the brightness.

Such a plasma display apparatus according to an embodiment of the present invention includes a plasma display panel displaying an image using plasma discharge, and an image filter disposed on a front surface of the plasma display panel, wherein the plasma display panel is parallel to each other. A front substrate on which the electrode and the second electrode are formed, a third electrode intersecting the first electrode and the second electrode are formed, and a discharge cell is formed between the rear substrate and the front substrate and the rear substrate disposed to face the front substrate. And a partition wall partitioning, wherein the plasma display panel includes xenon (Xe) of 12% or more and 30% or less of the total discharge gas, and the partition wall includes a first partition wall and a second partition wall that cross each other. At least one of the barrier ribs is formed with a channel having a predetermined depth, and at least a portion of the channels are darker than the barrier ribs. The image filter may include a light blocking pattern formed to be spaced apart from each other at a predetermined period and having a first refractive index, and a base layer formed to cover the light blocking pattern and having a second refractive index greater than the first refractive index.

Description

Plasma Display Apparatus {Plasma Display Apparatus}

1 is a view for explaining an example of the configuration of a plasma display device according to an embodiment of the present invention.

2A to 2H are views for explaining an example of the structure of a plasma display panel included in a plasma display device according to an embodiment of the present invention.

3 is a view for explaining an example of a structure in which a buffer unit is further provided between a plasma display panel and an image filter.

4 is a diagram for explaining a video filter in more detail.

5 is a diagram for explaining the function of a light shielding pattern.

6A to 6E are views for explaining still another form of the light shielding pattern.

7A to 7B are views for explaining the traveling direction of the light shielding pattern.

8A to 8C are diagrams for describing various types of light shielding patterns.

9 is a view for explaining an example of using two or more light shielding patterns having different patterns together.

10 is a diagram for explaining another structure of a light shielding pattern.

11 is a diagram for explaining an application example of an image filter including a light shielding pattern.

12 is a view for explaining an example of the configuration of a plasma display device according to an embodiment of the present invention including a drive unit.

FIG. 13 is a diagram for describing an image frame for implementing gray levels of an image in a plasma display device according to an embodiment of the present invention. FIG.

14 is a view for explaining an example of the operation of the plasma display device according to an embodiment of the present invention;

Fig. 15 is a diagram for explaining another type of reset signal.

16 is a diagram for explaining the magnitude of the voltage of the reset signal according to the temperature of the plasma display panel.

17 is a diagram for explaining an address bias signal supplied to a third electrode in a reset period.

18 is a diagram for explaining a rising signal and a falling signal.

19 is a diagram for explaining another type of the sustain signal.

20 is a view for explaining another example of the operation of the plasma display device according to an embodiment of the present invention;

<Explanation of symbols for the main parts of the drawings>

100: plasma display panel 110: image filter

The present invention relates to a plasma display device (Plasma Display Apparatus).

In general, the plasma display apparatus includes a plasma display panel displaying an image using plasma discharge and an image filter disposed in front of the plasma display panel.

In the plasma display panel, a phosphor layer is formed in a discharge cell divided by a partition wall, and a plurality of electrodes are formed.

The driving signal is supplied to the discharge cell through the electrode.

Then, the discharge is generated by the drive signal supplied in the discharge cell. Here, when discharged by a drive signal in the discharge cell, the discharge gas filled in the discharge cell generates vacuum ultraviolet rays, and the vacuum ultraviolet light emits the phosphor formed in the discharge cell to emit visible light. Generate. The visible light displays an image on the screen of the plasma display panel.

On the other hand, in the conventional plasma display apparatus, there is a problem that the contrast characteristic of the image displayed on the screen is deteriorated.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a plasma display device having improved contrast characteristics by improving an image filter disposed on a front surface of a plasma display panel.

A plasma display device according to an embodiment of the present invention for achieving the above object includes a plasma display panel for displaying an image by using a plasma discharge, and an image filter disposed in front of the plasma display panel, the plasma display panel A front substrate having a first electrode and a second electrode parallel to each other, a third electrode intersecting the first electrode and the second electrode, and a rear substrate disposed between the front substrate and the front substrate and the rear substrate; A partition wall for partitioning a discharge cell, wherein the plasma display panel includes xenon (Xe) of 12% or more and 30% or less of the total discharge gas, and the partition wall includes a first partition wall and a second partition wall that cross each other. A channel having a predetermined depth is formed in at least one of the first partition wall and the second partition wall, and at least a portion of the channel is partitioned. The image filter may have a darker color, and may be formed to be spaced apart from each other at predetermined intervals, and include a light blocking pattern having a first refractive index, and a base layer formed to cover the light blocking pattern and having a second refractive index greater than the first refractive index. .

Hereinafter, a plasma display device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view for explaining an example of the configuration of a plasma display device according to an embodiment of the present invention.

Referring to FIG. 1, a plasma display device according to an exemplary embodiment of the present invention includes a plasma display panel 100 that implements an image using plasma discharge and an image filter disposed on a front surface of the plasma display panel 100. , 110).

Here, although not shown, the image filter 110 is formed to be substantially spaced apart from each other at predetermined intervals, and includes a light blocking pattern having a first refractive index and a substrate having a second refractive index greater than the first refractive index and covering the light blocking pattern. It may comprise a layer.

The image filter 110 will be described later in more detail.

The plasma display panel 100 displays an image on a screen using plasma discharge. An example of such a plasma display panel 100 will be described with reference to FIGS. 2A to 2H.

2A to 2H are views for explaining an example of the structure of a plasma display panel included in a plasma display device according to an embodiment of the present invention.

First, referring to FIG. 2A, a plasma display panel that may be included in a plasma display apparatus according to an exemplary embodiment of the present invention includes a front substrate on which first electrodes 202 and Y and second electrodes 203 and Z are parallel to each other. 201 and the rear substrate 211 formed with the third electrodes 213 and X crossing the first and second electrodes 202 and Y and the second and second electrodes 203 and Z may be bonded to each other.

Here, the electrodes formed on the front substrate 201, preferably the first electrodes 202 and Y and the second electrodes 203 and Z, generate a discharge in a discharge space, that is, a discharge cell, and discharge the same. The discharge of the cell can be maintained.

The dielectric layer covers the first electrode 202 and the second electrode 203 and Z on the front substrate 201 where the first electrode 202 and the second electrode 203 and Z are formed. Preferably, the upper dielectric layer 204 can be formed.

This upper dielectric layer 204 limits the discharge current of the first electrode 202, Y and the second electrode 203, Z and between the first electrode 202, Y and the second electrode 203, Z. Can be insulated.

A protective layer 205 may be formed on the upper dielectric layer 204 to facilitate a discharge condition. The protective layer 205 may be formed through a method of depositing a material such as magnesium oxide (MgO) on the upper dielectric layer 204.

On the other hand, the electrode, preferably the third electrode (213, X) is formed on the back substrate 211, the third electrode 213, is formed on the upper side of the back substrate 211, the third electrode (213, X) is formed A dielectric layer, preferably lower dielectric layer 215 may be formed to cover X).

The lower dielectric layer 215 may insulate the third electrodes 213 and X. In addition, the lower dielectric layer 215 may have a color darker than the partition 212 described below.

As such, when the lower dielectric layer 215 has a darker color than the barrier rib 212, the background of the screen is darkened, and accordingly, contrast characteristics may be improved.

On top of the lower dielectric layer 215, a partition 212, such as a stripe type, a well type, a delta type, a honeycomb type, for partitioning a discharge cell, that is, a discharge cell, is formed. Can be formed. Accordingly, discharge cells such as red (R), green (G), and blue (B) may be formed between the front substrate 201 and the rear substrate 211.

In addition to the red (R), green (G), and blue (B) discharge cells, it is also possible to further form a white (W) or yellow (Yellow: Y) discharge cell.

On the other hand, the pitch of the red (R), green (G) and blue (B) discharge cells in the plasma display panel that can be included in the plasma display device according to an embodiment of the present invention may be substantially the same. The pitches of the red (R), green (G), and blue (B) discharge cells may be different to match the color temperature in the red (R), green (G), and blue (B) discharge cells.

In this case, the pitch may be different for each of the red (R), green (G), and blue (B) discharge cells, but the pitch of one or more discharge cells among the red (R), green (G), and blue (B) discharge cells. May be different from the pitch of other discharge cells. For example, as shown in FIG. 2B, the pitch (a) of the red (R) discharge cells is the smallest, and the pitch (b, c) of the green (G) and blue (B) discharge cells is defined as the pitch of the red (R) discharge cells ( It may be larger than a).

Here, the pitch (b) of the green (G) discharge cell may be substantially the same as or different from the pitch (c) of the blue (B) discharge cell.

In addition, the plasma display panel that may be included in the plasma display apparatus according to an exemplary embodiment of the present invention may have not only the structure of the partition 212 illustrated in FIG. 2A, but also the structure of the partition having various shapes. For example, the partition 212 includes a first partition 212b and a second partition 212a, where the height of the first partition 212b and the height of the second partition 212a are different from each other. For example, a groove-type partition structure having a groove formed in at least one of the first partition 212b and the second partition 212a may be possible.

Here, in the case of the differential partition structure, as shown in FIG. 2C, the height h1 of the first partition 212b of the first partition 212b or the second partition 212a is the height h2 of the second partition 212a. Can be lower than

Alternatively, at least one of the first and second partitions 212b and 212a may have a channel 212c having a predetermined depth that may be used as an exhaust passage. For example, a channel 212c may be formed in the first partition 212b as shown in FIG. 2D.

Here, at least part of the channel 212c may have a color darker than the partition 212. For example, the surface of channel 212c may be substantially black. As such, when the surface of the channel 212c has a darker color than the partition 212, the background of the screen may be darkened as in the case of the lower dielectric layer 215, thereby improving the contrast characteristic.

As such, to make the surface of the channel 212c darker than the partition 212, for example, black, a black layer 230 having a substantially black color may be formed on the surface of the channel 212c as shown in FIG. 2E. have. In the case of FIG. 2E, the depth of the channel 212c is smaller than the height of the first partition 212b.

Next, referring to FIG. 2F, unlike the previous FIG. 2E, the height of the first partition 212b and the depth of the channel 212c may be substantially the same.

Next, referring to FIG. 2G, a black layer 240 having a darker color than the partition 212 may be formed on at least one of the first and second partitions 212b and 212a.

As such, when the black layer 240 is formed on at least one of the first and second partitions 212b and 212a, the screen may be formed as in the case of the channel 212c and the lower dielectric layer 215. The background can be darkened and therefore the contrast characteristic can be improved.

The thickness of the black layer 240 may be set to 1 μm (micrometer) or more and 30 μm (micrometer) or less for structural stability of the plasma display panel.

On the other hand, in the plasma display panel that can be included in the plasma display device according to an embodiment of the present invention, although the red (R), green (G) and blue (B) discharge cells are shown and described as being arranged on the same line, It may be possible to arrange them in other shapes. For example, a delta type arrangement in which red (R), green (G) and blue (B) discharge cells are arranged in a triangular shape may be possible. In addition, the shape of the discharge cell may also be a variety of polygonal shapes, such as pentagonal, hexagonal, as well as rectangular.

Here, a predetermined discharge gas is filled in the discharge cell partitioned by the partition wall 212. In the discharge gas filled in the discharge cell, xenon (Xe) may include 12% or more and 30% or less than the total discharge gas. The discharge gas filled in the discharge cell will be described later in more detail.

In addition, a phosphor layer 214 that emits visible light for displaying an image during address discharge may be formed in the discharge cell partitioned by the partition wall 212. For example, red (R), green (G), and blue (B) phosphor layers may be formed.

In addition to the red (R), green (G), and blue (B) phosphors, it is also possible to further form a white (W) and / or yellow (Y) phosphor layer.

In addition, the phosphor layers 214 of the red (R), green (G), and blue (B) discharge cells may have substantially the same thickness or may differ from one or more. For example, when the thickness of the phosphor layer 214 in at least one of the red (R), green (G), and blue (B) discharge cells is different from the other discharge cells, the green ( The thicknesses t2 and t3 of the phosphor layer 214 in the G) or blue (B) discharge cells may be thicker than the thickness t1 of the phosphor layer 214 in the red (R) discharge cells. Here, the thickness t2 of the phosphor layer 214 in the green (G) discharge cell may be substantially the same as or different from the thickness t3 of the phosphor layer 214 in the blue (B) discharge cell.

In addition, the width or thickness of the third electrode 213 formed on the rear substrate 211 may be substantially constant, but the width or thickness inside the discharge cell may be different from the width or thickness outside the discharge cell. will be. For example, the width or thickness inside the discharge cell may be wider or thicker than that outside the discharge cell.

As such, the structure of the plasma display panel which may be included in the plasma display apparatus according to the exemplary embodiment may be variously changed.

Since the front substrate 201 of the plasma display panel described above is made of a glass material, it is likely to be damaged by an external impact or the like.

In order to prevent such damage, a buffer unit may be further included between the plasma display panel and the image filter. This will be described with reference to FIG. 3 attached thereto.

3 is a view for explaining an example of a structure in which a buffer unit is further provided between the plasma display panel and the image filter.

Referring to FIG. 3, one or more buffer units 120 and 130 may be further disposed between the plasma display panel 100 and the image filter 110. The buffer parts 120 and 130 may include a resin material or a glass material.

The buffer units 120 and 130 may absorb the impact applied to the plasma display panel 100 from the outside to protect the plasma display panel 100 from damage. Here, in order to more effectively protect the plasma display panel 100 from damage, the thickness (at least one of t1 or t2) of the buffer parts 120 and 130 may be about 200 μm (micrometer) or more and 400 μm (micrometer) or less. have.

The buffer parts 120 and 130 may include an impact resistance film.

For example, the buffer 120 may include a shock absorbing film, and the buffer 130 may be made of a resin material.

In addition, although the number of the buffer parts 120 and 130 was set to two in FIG. 3 here, it is also possible to provide one, three, or four buffer parts. That is, the number of buffer parts can be adjusted in various ways.

4 is a diagram for explaining the image filter in more detail.

Referring to FIG. 4, the image filter of the plasma display device according to the exemplary embodiment includes a light blocking pattern 410 and a base layer 420.

Here, the light blocking patterns 410 are formed to be spaced apart from each other at predetermined periods and have a first refractive index.

The base layer 420 covers the light blocking pattern 410 and has a second refractive index that is greater than the first refractive index. The base layer 420 may include a substantially transparent material.

Here, the light blocking pattern 410 may have a darker color than the base layer 420. For example, the light blocking pattern 410 is substantially black.

In addition, the light blocking pattern 410 may include a portion in which the width gradually decreases as the direction of the substrate layer 420 progresses.

Accordingly, one surface of the base layer 420 parallel to the bottom surface of the light blocking pattern 410 and the light blocking pattern 410 form a predetermined angle θ1.

The function of the light blocking pattern 410 will be described with reference to FIG. 5.

5 is a diagram for explaining the function of the light shielding pattern.

Referring to FIG. 5, light generated at a point at which the plasma display panel (not shown) is located is directly emitted to the outside, and light generated at b and c points is totally reflected by the light shielding pattern 410 and emitted to the outside. Can be.

On the other hand, light incident from points d and e positioned outside the plasma display panel may be absorbed by the light blocking pattern 410. This is because the refractive index of the light shielding pattern 410 is larger than the refractive index of the base layer 420, This is because one surface of the base layer 420 parallel to the bottom surface of the light blocking pattern 410 and the light blocking pattern 410 form a predetermined angle θ1.

Accordingly, the light generated inside the plasma display panel is effectively emitted to the outside, while the light incident from the outside is absorbed, thereby improving contrast characteristics.

In addition, light incident in a diagonal direction from the side surface of the plasma display panel may be mostly absorbed by the light blocking pattern 410. Accordingly, a normal image is seen by the viewer watching the image in the front direction of the plasma display panel, while a relatively low luminance image is seen by the viewer viewing the image in the lateral direction of the plasma display panel. As a result, the video security function can be obtained.

Here, in order to more effectively absorb light incident from the outside of the plasma display panel, and more effectively emit light generated inside the plasma display panel, one surface of the base layer 420 parallel to the bottom surface of the light shielding pattern 410 and light shielding are provided. The angle θ1 formed by the pattern 410 may be set to about 70 ° or more and 85 ° or less. In addition, the first refractive index of the light blocking pattern 410 may be 0.8 times or more and 0.98 times or less of the second refractive index of the base layer 420.

Next, FIGS. 6A to 6E are diagrams for describing another embodiment of the light shielding pattern.

First, referring to FIG. 6A, the light blocking pattern 610 may include two portions having different widths as the width of the light blocking pattern 610 progresses toward the base layer 620. For example, up to point a, its width may decrease at a first rate, while from point b, its width may decrease at a second rate that is greater than the first rate.

Next, referring to FIG. 6B, unlike the previous FIG. 6A, the light shielding pattern 630 may decrease in width by a first ratio up to point a, whereas the width of the light blocking pattern 630 may decrease in second ratio smaller than the first ratio from point b. have.

Next, referring to FIG. 6C, the light blocking pattern 650 may have a substantially flat end.

Next, referring to FIG. 6D, the light blocking pattern 640 may have a gentle curve on its side surface.

Next, referring to FIG. 6E, the side surface of the light blocking pattern 660 may be substantially straight up to point a, and may be curved from point b. For example, the light blocking pattern 660 has a curved shape at the end.

As described above, the shape of the light shielding pattern may be variously changed.

Next, FIGS. 7A to 7B are diagrams for describing a traveling direction of a light blocking pattern.

First, referring to FIG. 7A, the advancing direction of the light blocking pattern 700 and the long side of the base layer 710 may be substantially parallel to each other.

Next, referring to FIG. 7B, the traveling direction of the light blocking pattern 720 may form a predetermined angle θ2 with the long side of the base layer 710.

As such, when the advancing direction of the light blocking pattern 720 and the long side of the base layer 710 form a predetermined angle θ2, an interference fringe formed when two or more periodic patterns overlap. That is, it can block the moire fringe.

In addition, in order to more effectively block the moire pattern, the predetermined angle θ2 formed between the advancing direction of the light blocking pattern 720 and the long side of the base layer 710 may be set to about 1 ° or more and 5 ° or less.

Meanwhile, although the foregoing description of the light blocking pattern of the stripe type has been made and described above, the type of the light blocking pattern may be variously changed.

8A to 8C are diagrams for describing various types of light blocking patterns.

First, referring to FIG. 8A, the light blocking pattern 800 may be formed in a matrix type.

Next, referring to FIG. 8B, the light blocking pattern 820 may be formed in a wave type.

Next, referring to FIG. 8C, the light blocking pattern 830 may be formed as a protrusion type. For example, the plurality of light blocking patterns 830 of the type protruding in a hemispherical shape may be arranged at predetermined intervals.

As described above, the type of the light shielding pattern may be variously changed.

Next, FIG. 9 is a diagram for explaining an example of using two or more light blocking patterns having different patterns together.

9, the first light blocking portion 900 and the base layer 912 including the base layer 902 and the first light blocking pattern 901 parallel to the long side of the base layer 902, and the base layer 912. The second light blocking part 910 including the second light blocking pattern 911 parallel to the short side of FIG. 1 may be included in one image filter.

As such, when two or more light blocking patterns having different patterns are used together, the viewing angle of the plasma display panel may be variously adjusted.

Next, FIG. 10 is a diagram for explaining another structure of the light shielding pattern.

Referring to FIG. 10, the light blocking pattern 1010 has a plurality of layers. For example, the light blocking pattern 1010 may include a first light blocking pattern layer 1011 and a second light blocking pattern layer 1012. Here, the first light blocking pattern layer 1011 may be formed to cover the second light blocking pattern layer 1012.

In addition, the refractive index of the first light blocking pattern layer 1011 is preferably smaller than the refractive index of the base layer 1020.

In addition, the refractive index of the second light blocking pattern layer 1012 may be different from or the same as the refractive index of the first light blocking pattern layer 1011. For example, the refractive index of the second light blocking pattern layer 1012 is smaller than the refractive index of the first light blocking pattern layer 1011.

Next, FIG. 11 is a diagram for describing an application example of an image filter including a light blocking pattern.

Referring to FIG. 11, a first adhesive layer 1180 may be formed on an entire surface of the plasma display panel 1170, and an image filter 1190 may be attached to the first adhesive layer 1180.

In other words, the image filter 1190 may be attached or laminated on the front surface of the plasma display panel 1170.

In addition, in the image filter 1190, the light blocking pattern 1110 and the base layer 1120 may be formed, and the second adhesive layer 1150 may be formed on the base layer 1120.

The near infrared shielding layer 1130 may be formed on the second adhesive layer 1150, and the third adhesive layer 1160 may be formed on the near infrared shielding layer 1130.

The electromagnetic shielding layer 1140 may be formed on the third adhesive layer 1160.

Here, the electromagnetic shielding layer 1140 may shield electromagnetic waves generated when the plasma display panel is driven to reduce the occurrence of electromagnetic magnetic interference (EMI).

The near-infrared shielding layer 1130 blocks near infrared rays (NIR), thereby preventing malfunction of the plasma display panel due to such near infrared rays.

Here, when the thickness of the first adhesive layer 1180 bonding the image filter 1190 and the plasma display panel 1170 is excessively thick, light emitted from the plasma display panel 1170 may be prevented from being emitted to the outside. On the other hand, when the thickness is excessively thin, the adhesion between the plasma display panel 1170 and the image filter 1190 may decrease.

In consideration of this, the thickness of the first adhesive layer 1180 is set to about 10 μm (micrometer) or more and 50 μm (micrometer) or less, and more preferably 20 μm (micrometer) or more and 40 μm (micrometer) or less. Can be.

On the other hand, the light-shielding pattern described above can improve the contrast characteristics by absorbing light incident from the outside of the plasma display panel, while emitting light generated inside the plasma display panel, but the inside of the plasma display panel By absorbing a portion of the generated light, the overall brightness can be reduced.

In order to compensate for the decrease in brightness, the content of xenon (Xe) in the discharge gas filled in the plasma display panel may be 12% or more and 30% or less. This is as follows.

Xenon (Xe) has a property that can increase the generation of vacuum ultraviolet light during discharge. Accordingly, when the xenon (Xe) content of the discharge gas filled in the discharge cell is increased, the amount of light generated in the discharge cell is increased, thereby improving the luminance of the image.

Therefore, when the light blocking pattern is applied to the image filter, the contrast characteristic is improved, but when the luminance is reduced, the luminance can be compensated by setting the content of xenon (Xe) in the discharge gas to 12% or more and 30% or less than the total discharge gas. .

12 is a view for explaining an example of the configuration of a plasma display device according to an embodiment of the present invention including a drive unit.

Referring to FIG. 12, the plasma display apparatus according to the exemplary embodiment may further include a driver 1210 supplying a driving signal to an electrode of the plasma display panel 1200.

Since the plasma display panel 1200 has been described in detail with reference to FIGS. 2A to 2H, further description thereof will be omitted.

The driver 1210 supplies a driving signal to the first electrode or the second electrode formed on the plasma display panel 1200. For example, the driver 1210 may transmit a reset signal having a different voltage from another subfield to a first electrode of the plasma display panel 1200 in the reset period of at least one of the plurality of subfields of the image frame. Can supply

In addition, the driver 1210 may not supply the reset signal in the reset period or may omit the reset period in the subfield disposed first in time among the plurality of subfields of the image frame.

Here, in FIG. 12, only the case where the driver 1210 is formed as one board is shown. However, in the present invention, the driver 1210 is divided into a plurality of board types according to electrodes formed on the plasma display panel 1200. It is also possible to lose.

For example, a first electrode and a second electrode parallel to each other and a third electrode crossing the first electrode and the second electrode in the plasma display panel 1200 included in the plasma display apparatus according to an embodiment of the present invention. In this case, the driver 1210 may include a first driver (not shown) for supplying a drive signal to the first electrode, a second driver (not shown) for supplying a drive signal to the second electrode, and a third electrode. It may be divided into a third driver (not shown) for supplying a drive signal to.

This driving unit will be more clearly described later.

An example of the operation of the plasma display apparatus according to the exemplary embodiment of the present invention will be described below.

FIG. 13 is a diagram for describing an image frame for implementing gray levels of an image in a plasma display device according to an embodiment of the present invention.

14 is a view for explaining an example of the operation of the plasma display device according to an embodiment of the present invention.

First, referring to FIG. 13, an image frame for implementing gray levels of an image in a plasma display device according to an embodiment of the present invention may be divided into several subfields having different emission counts.

Although not illustrated, at least one subfield of the plurality of subfields may be reset according to a reset period for initializing all discharge cells, an address period for selecting discharge cells to be discharged, and the number of discharges. It can be divided into a sustain period that implements gradation.

For example, when an image is to be displayed with 256 gray levels, one image frame is divided into eight subfields SF1 to SF8, for example, as shown in FIG. 13, and each of the eight subfields SF1 to SF8. Is divided into a reset period, an address period, and a sustain period.

The gray scale weight of the corresponding subfield may be set by adjusting the number of the sustain signals supplied in the sustain period. That is, a predetermined gray scale weight can be given to each subfield using the sustain period. For example, the gray scale weight of each subfield is 2 ⁿ by setting the gray scale weight of the first subfield to 2 ⁰ and the gray scale weight of the second subfield to 2 ¹ (where n = 0, 1). , 2, 3, 4, 5, 6, and 7) to increase the gray scale weight of each subfield. As described above, the number of sustain signals supplied in the sustain period of each subfield is adjusted according to the gray scale weight in each subfield, thereby implementing gray levels of various images.

The plasma display apparatus according to an exemplary embodiment uses a plurality of image frames to implement an image, for example, to display an image of 1 second. For example, 60 image frames are used to display an image of 1 second. In this case, the length of one image frame may be 1/60 second, that is, 16.67 ms.

In FIG. 13, only one image frame is composed of eight subfields. However, the number of subfields constituting one image frame may be variously changed. For example, one video frame may be configured with 12 subfields from the first subfield to the twelfth subfield, or one video frame may be configured with 10 subfields.

In addition, in FIG. 13, subfields are arranged in increasing order of gray scale weight in one image frame. Alternatively, subfields may be arranged in decreasing order of gray scale weight in one image frame. Alternatively, subfields may be arranged regardless of the gray scale weight.

Next, referring to FIG. 14, an example of an operation of a plasma display apparatus according to an exemplary embodiment of the present invention in any one of a plurality of subfields included in an image frame as shown in FIG. 13 is shown.

First, in the set-up period of the reset period for initialization, the driving unit of reference numeral 1210 of FIG. 12 may supply a ramp-up signal to the first electrode Y. It will be appreciated that various driving signals to be described below may be supplied by the driver 1210 of FIG. 12.

Here, the rising ramp signal is a second gentler than the first slope from the 30th voltage V30 to the 40th voltage V40 after rising to the first slope from the 20th voltage V20 to the 30th voltage V30. It can rise gradually with a slope.

In such a setup period, a weak dark discharge, that is, a setup discharge may occur in the discharge cell by the rising ramp signal. By this setup discharge, some wall charges can be accumulated in the discharge cells.

In a set-down period after the set-up period, a ramp-down signal in a direction opposite to that of the ramp ramp signal may be supplied to the first electrode Y after the ramp ramp signal.

Here, the falling ramp signal may gradually fall from the thirtieth voltage V30 to the fifty voltage V50.

As a result, weak erase discharge, that is, set-down discharge, occurs in the discharge cell. By this set-down discharge, wall charges such that address discharge can be stably generated can be uniformly retained in the discharge cells.

The rising ramp signal and the falling ramp signal described above may be referred to as reset signals.

Next, FIG. 15 is a diagram for explaining another type of reset signal.

Referring to FIG. 15, the reset signal may have a form of gradually descending from the twentieth voltage V30 to the fifty voltage V50 after rising to the twentieth voltage V20. Compared to the case of FIG. 14, the rising ramp signal is omitted from the reset signal of the case of FIG. 14.

In this way, the reset signal can be changed in various forms.

Next, FIG. 16 is a diagram for describing the magnitude of the voltage of the reset signal according to the temperature of the plasma display panel.

Referring to FIG. 16, when the temperature of the plasma display panel is room temperature, the maximum voltage of the reset signal may be set to Va as shown in ①, and when the temperature of the plasma display panel is lower than the room temperature, as shown by ②, The maximum voltage can be set to be Vb higher than Va.

That is, when the temperature of the plasma display panel is relatively low temperature, the voltage of the reset signal is made higher than at room temperature higher than the low temperature.

Here, when the temperature of the plasma display panel is low, the energy of the wall charges in the discharge cell may be less than at room temperature. Then, when the temperature of the plasma display panel is low, the intensity of the discharge generated according to the same driving signal may be relatively weaker than the normal temperature. As a result, the discharge may become unstable.

On the other hand, when the temperature of the plasma display panel is relatively low and low temperature as in the embodiment of the present invention, if the voltage of the reset signal is larger than the room temperature, the energy of the wall charges in the discharge cell is higher than the room temperature. A smaller number may generate a discharge of sufficient intensity. Therefore, the discharge can be stabilized.

Next, FIG. 17 is a diagram for explaining an address bias signal supplied to the third electrode in the reset period.

Referring to FIG. 17, when the reset signal is supplied to the first electrode in the reset period, the address bias signal Xbias may be supplied to the third electrode.

The address bias signal may overlap with the rising ramp signal supplied to the first electrode.

As such, when the address bias signal is supplied to the third electrode in the reset period, the occurrence of erroneous discharge between the first electrode and the third electrode can be reduced by reducing the voltage difference between the first electrode and the third electrode in the reset period. have.

On the other hand, in the address period after the reset period, a scan bias signal substantially maintaining a voltage higher than the 50 th voltage V50 of the falling ramp signal may be supplied to the first electrode Y.

In addition, the scan signal Scan, which decreases from the scan bias signal by the scan voltage ΔVy, may be supplied to all of the first electrodes Y1 to Yn.

For example, the first scan signal Scan 1 is supplied to the first first electrode Y1 of the plurality of first electrodes Y, and then the second scan signal (2) is applied to the second first electrode Y2. Scan 2) is supplied, and the n-th scan signal Scan n is supplied to the n-th first electrode Yn.

On the other hand, the width of the scan signal in units of subfields may vary. That is, the width of the scan signal Scan in at least one subfield may be different from the width of the scan signal Scan in other subfields. For example, the width of the scan signal Scan in the subfield located later in time may be smaller than the width of the scan signal Scan in the subfield located earlier. In addition, the scan signal scan width decreases according to the arrangement order of the subfields gradually, such as 2.6 ms (microseconds), 2.3 ms (microseconds), 2.1 ms (microseconds), 1.9 ms (microseconds), and the like. Or 2.6 ㎲ (microseconds), 2.3 ㎲ (microseconds), 2.3 ㎲ (microseconds), 2.1 ㎲ (microseconds) ... 1.9 ㎲ (microseconds), 1.9 ㎲ (microseconds) It could be done.

As such, when the scan signal Scan is supplied to the first electrode Y, a data signal rising by the magnitude ΔVd of the data voltage may be supplied to the third electrode X to correspond to the scan signal.

As the scan signal Scan and the data signal Data are supplied, the voltage difference between the voltage of the scan signal and the data voltage Vd of the data signal and the wall voltage due to the wall charges generated in the reset period. In addition, address discharge may occur in a discharge cell to which the voltage Vd of the data signal is supplied.

Here, a sustain bias signal may be supplied to the second electrode Z to prevent address discharge from becoming unstable due to interference of the second electrode Z in the address period.

Here, it is preferable that the sustain bias signal maintain a substantially constant sustain bias voltage Vz smaller than the voltage of the sustain signal supplied in the sustain period and larger than the voltage of the ground level GND.

Meanwhile, the rising signal and the falling signal may be further supplied between the reset period and the address period described above. Looking at with reference to Figure 18 attached to this as follows.

18 is a diagram for explaining a rising signal and a falling signal.

18, the rising signal and the falling signal are supplied to the first electrode in a period from when the falling ramp signal is supplied to the first electrode in the reset period and before the scan signal Scan is supplied to the first electrode in the address period. Can be.

For example, after the falling ramp signal is supplied to the first electrode, a rising signal rising by a voltage of ΔV1 is supplied, and then a first falling signal falling by a voltage of ΔV2 is supplied, and then falling by a voltage of ΔV2. A second falling signal can be supplied. Wherein ΔV 1 and ΔV 2 may be substantially the same.

In addition, the ΔV1 or ΔV2 may be substantially equal to the magnitude of the voltage of the sustain signal to be supplied to at least one of the first electrode and the second electrode in the sustain period to be described later.

As such, when the rising signal and the falling signal are supplied to the first electrode after the falling ramp signal is supplied, but before the scan signal is supplied, when the amount of wall charges in the discharge cell is excessively large after the reset period. The wall charge can be sufficiently erased. As a result, the occurrence of false discharge can be suppressed.

Subsequently, the sustain signal SUS may be supplied to the first electrode Y and / or the second electrode Z in the sustain period for displaying an image. For example, the sustain signal SUS is supplied to the first electrode Y and the second electrode Z alternately. The sustain signal SUS may have a magnitude of a voltage of ΔVs.

When the sustain signal SUS is supplied, the discharge cell selected by the address discharge is added to the first electrode when the wall voltage in the discharge cell and the sustain voltage Vs of the sustain signal SUS are added and the sustain signal SUS is supplied. A sustain discharge, that is, a display discharge, occurs between (Y) and the second electrode Z. Accordingly, a predetermined image is implemented on the plasma display panel.

Next, FIG. 19 is a diagram for explaining another type of the sustain signal.

Referring to FIG. 19, at least one of the plurality of sustain signals supplied from the sustain unit may have a pulse width different from that of other sustain signals.

For example, when the pulse width of the first sustain signal SUS1 is W1 among the plurality of sustain signals supplied in the sustain period, the pulse width of the second sustain signal SUS2 supplied thereafter is W2 less than W1. Can be.

As such, when the pulse width of the first sustain signal SUS1 is larger than the pulse widths of the other sustain signals among the plurality of sustain signals supplied in the sustain period, the initial sustain discharge in the sustain period is sufficiently stabilized. Sustain discharge over the period can be stabilized.

20 is a view for explaining another example of the operation of the plasma display device according to an embodiment of the present invention. Here, in FIG. 20, the description thereof will be omitted.

Referring to FIG. 20, a sustain signal may not be supplied or a sustain period may be omitted in at least one subfield of a plurality of subfields of an image frame.

Alternatively, the reset signal may not be supplied in the reset period or the reset period may be omitted in the subfield disposed first in time among the plurality of subfields of the image frame.

For example, it may be omitted in the reset period and the sustain period as shown in the first subfield of FIG. 20. Accordingly, the first subfield may include only an address period. Alternatively, although not shown in FIG. 20, the reset period may be included in the first subfield, and the reset signal may not be supplied in the reset period. Alternatively, although not shown in FIG. 20, it is also possible that the first subfield includes a sustain period, and at the same time, a sustain signal is not supplied in the sustain period.

In this first subfield, the reset discharge and the sustain discharge may be omitted and the address discharge may occur in comparison with the other subfields. Accordingly, the gray level of the image may be implemented by only the address light due to the address discharge in the first subfield. As a result, gray scales of an image can be realized using light having a smaller size than other subfields, and thus gray scale expressing power can be further improved.

As described above, the subfield in which the sustain signal is not supplied or the sustain period is omitted in the sustain period or the subfield in which the reset signal is not supplied or the reset period is omitted in the reset period is different from the next subfield. Unlike the subfields, there may be a plurality of reset signals.

For example, the first reset signal and the second reset signal may be supplied to the first electrode in the reset period in the second subfield consecutive to the first subfield to which the sustain signal is not supplied.

As such, the reason for the plurality of reset signals in the second subfield is that the sustain signal is not supplied in the sustain period or the reset signal is not supplied or the reset period is omitted in the subfield or the reset period in which the sustain period is omitted. This is because the sustain discharge or reset discharge does not occur in the subfield, so that the distribution of the wall charges in the discharge cells may be relatively unstable. In other words, a plurality of reset signals may be provided in a subfield in which the sustain signal is not supplied in the sustain period or the sustain period is omitted, or in the next subfield of the subfield in which the reset signal is not supplied or the reset period is omitted in the reset period. To evenly distribute the wall charge in the discharge cell.

Meanwhile, in a reset period of at least one subfield of the plurality of subfields of the image frame, a reset signal having a different magnitude from another subfield may be supplied to the first electrode.

For example, in the third subfield as shown in FIG. 20, the reset signal as shown in FIG. 15 is supplied to the first electrode, while in the fourth subfield, the rising ramp signal and the falling ramp as shown in FIG. 14. A reset signal including the signal together, that is, a reset signal having a larger voltage than that in FIG. 15, may be supplied to the first electrode.

20, the rising signal and the falling signal described above with reference to FIG. 18 may be selectively supplied from a predetermined subfield among a plurality of subfields. For example, in the third and fourth subfields, the rising signal and the falling signal as shown in FIG. 18 may be supplied to the first electrode, whereas they may not be supplied in the first, second and fifth subfields.

Meanwhile, referring to FIG. 20, the address bias signal described with reference to FIG. 17 may also be selectively supplied from a predetermined subfield among the plurality of subfields as in the case of the foregoing case. For example, the address bias signal as shown in FIG. 17 is supplied to the third electrode in the second and fourth subfields, while not supplied in the first, third and fifth subfields.

As such, the technical configuration according to an embodiment of the present invention described above may be implemented in other specific forms by those skilled in the art to which the present invention pertains without changing its technical spirit or essential characteristics according to an embodiment of the present invention. You will understand that.

Therefore, the exemplary embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the foregoing detailed description, and the meaning and scope of the claims are as follows. And all changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

As described above in detail, in the plasma display device according to the exemplary embodiment of the present invention, a light shielding pattern is formed on an image filter, and xenon (Xe) is included in the discharge cell of the plasma display panel by 12% or more and 30% or less. There is an effect of improving the contrast characteristics of the image to be implemented, and at the same time improving the brightness.

In addition, the plasma display device according to an embodiment of the present invention is substantially black in color of the surface of the channel formed in the partition wall, thereby improving the contrast characteristics.

Claims (20)

A plasma display panel which displays an image using plasma discharge, Image filter disposed on the front of the plasma display panel Including, The plasma display panel A front substrate having a first electrode and a second electrode parallel to each other; A rear substrate having a third electrode intersecting the first electrode and the second electrode and disposed to face the front substrate; And A partition wall partitioning a discharge cell between the front substrate and the rear substrate; Including, The plasma display panel includes xenon (Xe) 12% or more and 30% or less of the total discharge gas, The barrier rib includes a first barrier rib and a second barrier rib that cross each other. A channel is formed in at least one of the first and second partitions, and at least a part of the channel has a color darker than that of the first and second partitions, The image filter is A light shielding pattern (Pattern) having a first refractive index, A base layer formed to cover the light blocking pattern and having a second refractive index greater than the first refractive index Plasma display device comprising a. The method of claim 1, And a black layer having a color darker than that of the first and second barrier walls is formed on at least one of the first and second barrier walls. The method of claim 2, And a thickness of the black layer is 1 μm (micrometer) or more and 30 μm (micrometer) or less. The method of claim 1, A dielectric layer covering the third electrode is formed on the rear substrate, and the dielectric layer has a color darker than the first and second barrier walls. The method of claim 1, And a height of the first partition wall is different from a height of the second partition wall. The method of claim 1, The discharge cell includes a first discharge cell and a second discharge cell, A first phosphor layer is formed in the first discharge cell, a second phosphor layer is formed in the second discharge cell and emits light of a different color from the first phosphor layer, And the thickness of the first phosphor layer is different from the thickness of the second phosphor layer. The method of claim 1, And the image filter is attached to or laminated on the front surface of the plasma display panel. The method of claim 1, And a long side of the light blocking pattern and a long side of the base layer. The method of claim 1, And a long side of the light blocking pattern and a long side of the base layer intersect each other. The method of claim 9, And an angle formed by a traveling direction of the light blocking pattern and a long side of the base layer is 1 ° or more and 5 ° or less. The method of claim 1, And the first refractive index is 0.8 times or more and 0.98 times or less of the second refractive index. The method of claim 1, The light blocking pattern has a darker color than the base layer. The method of claim 1, And the light blocking pattern includes a portion of which the width gradually decreases as the light blocking pattern progresses toward the substrate layer. The method of claim 1, And an angle formed between one surface of the base layer and a side surface of the light blocking pattern parallel to a bottom surface of the light blocking pattern. The method of claim 1, The light blocking pattern is one or more of a stripe type, a matrix type, and a wave type. The method of claim 1, At least one buffer unit is further disposed between the plasma display panel and the image filter. The method of claim 16, The buffer unit includes at least one of a resin material and a glass material. The method of claim 16, And the buffer portion has a thickness of 200 μm (micrometer) or more and 400 μm (micrometer) or less. The method of claim 1, Further comprising a driving unit for supplying a driving signal to the first electrode or the second electrode, The driving unit And a reset signal having a different voltage from the other subfields to the first electrode in the reset period of at least one of the plurality of subfields of the image frame. The method of claim 19, And the driving unit does not supply the reset signal in the reset period or omit the reset period in the first subfield of the plurality of subfields of the image frame.

Images