JP2000100333A - Plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display in which large number of brightness gradation can be taken, even if the number of sub-fields is set small, and to provide brightness and efficiency are high. SOLUTION: Luminescent cells for RGB(red, green, blue) are respectively divided into several sub-cells, the sub-cells surrounded by a rib 29 coated with phosphor are allowed to be turned on or off independently and number of turned on sub-cells for each sub-field to provide gradation. Because the realization of the brightness gradation is facilitated even if the number of sub-fields is small, pseudo-outline is reduced and image quality is improved. Because more multiple gradation can be realized when the number of sub-fields is same and smooth change is allowed, an image with ultra-high quality can be provided. Simultaneously, each sub-field is surrounded by a bulkhead, phosphor area is increased compared to prior art, the brightness can be improved at the same power, and a very bright PDF panel with high efficiency is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a plasma display panel capable of excellent panel construction and light emission.

[0002]

2. Description of the Related Art In a plasma display, a gas is ionized between a front substrate and a back substrate constituting a panel, and a phosphor is excited by ultraviolet rays generated at that time to obtain a visible light display.

[0003] The panel configuration and operation of the above-described conventional plasma display will be described below with reference to the drawings.

FIG. 2 is a partial perspective view of a conventional plasma display. In FIG. 2, 1 is a front panel glass, and 2 is a back panel glass. 300 between front panel glass and back panel glass
A rare gas of Torr to 500 Torr is sealed, and the periphery is sealed to form a plasma display panel. On the front panel glass 1, a display electrode pair 5, 6 composed of a transparent electrode 3 and a metal electrode 4 is formed in a pattern, and a dielectric film 7 is formed in a thickness of 30 μm to 40 μm so as to cover it. On the dielectric film 7, a protective film 8 is formed for the purpose of protecting the sputtering by the discharge gas.

On the other hand, ribs (partition walls) 9 to 13 are formed on the surface of the back panel glass 2, and RGB phosphors 14 to 16 are repeatedly buried between the ribs as a pair of RGB to form phosphors 14 to 17. Address electrodes 18 to 21 at the bottom
Are formed.

[0006] The plasma display constructed as described above has address electrodes 18 to 21 and a display electrode pair 5 in advance.
The pixels to be discharged are addressed by causing a discharge between them and performing a memory operation by wall charges.
Thereafter, by applying a voltage to the display electrode pair, a discharge occurs in the addressed portion of the display electrode pair, ultraviolet rays are generated, and visible light is emitted from the RGB phosphors 14 to 17 excited by the ultraviolet rays. Is displayed as an image.

FIG. 3 is a schematic perspective view of the plasma display panel viewed from above, showing address electrodes 18 to 21,
The relationship between the ribs 9 to 13 and the display electrodes 5 and 6 is shown. In the drawing, a light emitting display portion and one pixel composed of RGB are illustrated by dashed lines. Each light emitting location is specified by an address electrode and a display electrode. The memory is stored by the wall charges, and when a voltage is applied between the display electrodes, light emission occurs at the stored location.

An image in which the hue and the luminance change according to the place of light emission and the number of times of light emission is displayed, and a function as a display is produced. The light emitting part in one pixel is RGB
In order to achieve one pixel at an arbitrary chromaticity and luminance at one location in each cell, gradation is realized by controlling the number of lighting times of each of RGB.

[0009]

In the above-described conventional configuration, each of the RGB light emitting cells is one light emitting unit, and the luminance is determined by how many times the light emitting unit emits light in one field. The luminance gradation is realized by changing the total number of times of light emission included in each subfield in one field for each cell. The number of subfields is important in determining the gradation, and a large number of subfields are required to realize a high gradation. However, one subfield is composed of a setup, an address, a sustain and an elevate operation.
If it is attempted to use about two subfields, sufficient address time cannot be obtained, and 256 gradations are currently available.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a plasma display capable of obtaining a large luminance gradation even when the number of subfields is set small. The purpose is also to obtain.

[0011]

In order to achieve the above object,
The present invention is characterized in that some or all of the red, green, and blue discharge cells constituting a pixel are formed of an aggregate of subcells of the same color that emit light individually or in several pieces.

Each of the sub-cells is structured so as to be surrounded on two sides by a partition wall coated with a phosphor, and the sub-cells of the same color are arranged in a line.

Further, some of the red, green and blue discharge cells constituting the pixel are composed of an aggregate of sub-cells of the same color which individually or severally emit light individually, and the number of the sub-cells which emit light in the aggregate. The luminance of each pixel is changed by increasing or decreasing the number of pixels.

Further, some of the red, green and blue discharge cells constituting the pixel are composed of an aggregate of sub-cells of the same color which emit light individually or several at a time, and the sub-cells of the same color in each of the aggregates It is characterized in that the number is switched and turned on for each subfield constituting one field.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to RGB
Is divided into several sub-cells surrounded by phosphor-coated ribs, so that a sub-cell group in which some of the sub-cells are paired or individual sub-cells can be separately lit and erased. Each time, the number of lights is changed to obtain a gradation. At the same time, since the subcells are surrounded by ribs (partitions) coated with phosphor on the side surfaces, the luminance is increased with the same power and the efficiency is remarkably improved.

According to the above configuration and method, each RGB can display only one gradation with one light emission.
Since each of RGB is divided into sub-cells, and the number of light emission of the sub-cells is controlled so that a luminance gradation can be obtained, a high gradation can be obtained even with a small number of sub-fields, and a subtle tint of an image can be obtained. Can be controlled. In addition, since there is a margin in gradation display, a part of the subfield can be used as a countermeasure for a pseudo contour without lowering the gradation. As a result, very good image quality can be obtained.

Further, in the present invention, since the subcells are mixed in position in the pixel constituted by the RBG, the bias of lighting of each color in each subcell is small and a beautiful color tone can be obtained.

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

FIG. 1 is a schematic block diagram showing a transmission structure and a signal system of one pixel of a plasma display panel according to this embodiment. In FIG. 1, 25 is a scan driver, and 30 is an electrode. The electrode 30 is 1
Y1 and Y2 are formed in the pixel. An address driver 26 sends a signal to the address electrode 32. In this embodiment, six address electrodes D1 to D6 are formed in one pixel, and a voltage of 60 V to 80 V is applied between the electrodes 30 and 31 after the setup of each subfield is completed. The sub-cell is addressed by discharging the sub-cell, which is the minimum discharge unit, and putting a charge on the wall.

Reference numeral 27 denotes a sustain pulse generator which sends a signal to 31 electrodes X1 and X2. 29 is a rib (partition) formed from L1 to L7. Since a voltage of about 200 V is applied between the electrode X1 and the electrode Y1 or between the electrode X2 and the Y2, a discharge is generated between the pre-addressed subcells between the respective XY electrodes by overlapping with the wall voltage.

In the present embodiment, Ne 95% and Xe 5% are
Since a panel filled with 0 Torr is used, ultraviolet rays of 147 nm are generated by the discharge between the X and Y electrodes. Red (R) applied between the ribs L1 to L7 by this ultraviolet light,
Visible light is emitted from the green (G) and blue (B) phosphors, and an image is generated by a collection of these point emissions.

In this embodiment, of all the subcells, the light emitting section 2
8 shows that from G1 to G7. In this embodiment, the number of subcells emitting light is four for red (R) and one for green (B).
And blue (B) indicate a state in which two are lit. Conventionally, for example, for red (R), one red (R) cell, which corresponds to four of the present embodiment, is turned on or off to express luminance, whereas in the present embodiment, four sub-cells are used. Four gradations can be expressed by illuminating how many of them. By changing these four gradations for each subfield, the degree of freedom of the gradation is significantly increased, and a large dynamic range of luminance can be obtained.

Alternatively, in this embodiment, since the panel can be expressed in 4 gradations, what was conventionally expressed in 256 gradations by 8 bits can be expressed in 256 gradations in 6 bits, and the remaining 2 bits can be expressed in 2 bits. This can be used for countermeasures against false contours. Therefore, the image becomes more beautiful and the quality is improved. In addition, the conventional method has a problem in that a pseudo contour is likely to appear due to a change in the temporal spread of luminance between the 31st gradation and the 32nd gradation.

However, in this embodiment, since the expression method of the panel luminance can be flexibly changed, a pseudo contour is hardly generated. For example, instead of emitting 32 gradations at a time 32 times in a subfield as in the related art, (4 + 8 +
16/4 + 32/4 + 64/4).

In other words, at the time of light emission of each of 16, 32, and 64, only one of the four sub-cells is illuminated, so that 32 gradations can be expressed. Therefore, (1 + 2 + 4 + 8 + 16)
, And there is no temporal difference between the 31st gradation expressed by the sum of the number of pulses and the luminance, so that a very smooth image expression can be realized.

Further, in this embodiment, the positions of the sub-cells are spatially divided, and the locations where light is emitted for each gradation are surrounded by ribs, so that the phosphors on the side surfaces of the ribs of each sub-cell emit light. Thus, a panel having higher luminance and higher efficiency than the case without a subcell can be obtained.

As described above, in this embodiment, the RGB light emitting cells constituting the pixel are divided into several subcells, and the subcells surrounded by the phosphor-coated ribs can be separately lit and erased. In each subfield, the number of lights is changed to obtain a gradation. As a result, not only the gradation can be controlled by the number of light emission in the subfield, but also the luminance can be changed by the number of lighting of the subcells in the panel, so that the luminance gradation can be remarkably easily realized.

When the number of sub-feeds is the same, a larger number of gradations can be realized than in the conventional case. Further, since the change in gradation can be smoothly changed on the screen, a very high-quality image can be obtained. In addition, since each subfield is surrounded on two sides by ribs (walls) coated with a phosphor, the phosphor application area is increased as compared with the related art, and luminance can be increased with the same power. Therefore, a very bright and highly efficient PDP panel can be obtained.

Although the present embodiment has shown the case where there is a sub-cell in each of the RGB cells, the positions in the cells may be mixed. For example, in this embodiment, the sub-cells are arranged from RRGBB from the left, but may be arranged from RGBRGB. In this case, since the colors are mixed and the color is generated, the change in the color tone of the image becomes smoother, and the quality of the image is improved.

In this embodiment, the case where two pairs of electrodes XY are arranged in one cell is shown. However, if only one pair is used, the gradation by the panel is reduced to two gradations, but the effect described in this patent is expected. Needless to say, three or more pairs may be arranged.

It is quite conceivable to increase the number of sub-cells by increasing the number of ribs and the number of electrodes to increase the number of gradations in the panel. However, when considering the current production of PDP panels, as the number of ribs increases, the aperture ratio due to the thickness of the ribs decreases. Therefore, there is an upper limit to the size of the subcell from the viewpoint of production.

In general, it is necessary to increase the luminance of B in order to increase the color temperature of RGB. Therefore, the number of subcells may be increased by B and some of them may be driven simultaneously. This makes it possible to obtain a panel with a high color temperature.

In this embodiment, a plasma display panel has been described as an example. However, a display device such as an FED (field emission display) or an organic EL using another display element, or a micro mirror having a subfield configuration, for example, is used. It is needless to say that the technical idea of the present invention can be applied to a display device such as a DMD using the same.

[0034]

As described above, according to the present invention, not only the gradation can be controlled by the number of light emission in the subfield, but also the luminance can be changed by the number of lighting of the subcell in the panel. Realization of the luminance gradation becomes easy. In particular, when the number of sub-feeds is the same, a larger number of gradations can be realized than before.

Further, since the change in gradation can be smoothly changed on the screen, a very high-quality image can be obtained.

Further, in the configuration of the PDP in which each subfield is surrounded on two sides by partition walls coated with a phosphor,
Conventionally, the phosphor application area is increased, and the luminance can be increased with the same power. Therefore, a very bright and highly efficient PDP panel can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic transmission configuration of one pixel of a plasma display panel and a schematic block diagram of a signal system according to an embodiment of the present invention.

FIG. 2 is a partial perspective configuration diagram of a conventional plasma display.

FIG. 3 is a schematic transmission configuration diagram of a conventional plasma display.

[Explanation of symbols]

 Reference Signs List 25 scan driver 26 address driver 27 sustain pulse generator 29 rib (partition wall) 30 electrode 31 electrode 32 address electrode

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hidetaka Higashino 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Junichi Hibino 1006 Odaka Kadoma Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. 72) Inventor Masaki Aoki 1006 Kadoma, Kazuma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Shigeo Suzuki 1006 Odaka Kazuma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Kinzo Nonomura Osaka 1006 Kadoma, Kadoma City Matsushita Electric Industrial Co., Ltd. F-term (reference) 5C040 FA01 FA04 GB03 GB14 GC11 GG03 GG05 LA02 LA12 LA13 LA18 MA03 MA14

Claims (9)

[Claims] 1. A plasma display which emits light by discharging a gas, wherein some or all of red (R), green (G), and blue (B) discharge cells constituting a pixel are individually or several times. A plasma display panel comprising a group of sub-cells of the same color that emit light individually. 2. Some or all of the red (R), green (G), and blue (B) discharge cells constituting a pixel are composed of an aggregate of sub-cells of the same color that emit light individually or several at a time. Wherein the number of aggregates forming the blue (B) pixels is larger than the number of aggregates forming the red (R) and green (G) pixels. 3. The plasma according to claim 1, wherein each of the subcells has a structure in which two sides are surrounded by a partition wall coated with a phosphor, and the subcells having the same color are arranged in a line. Display panel. 4. An assembly of sub-cells of the same color constituting each of red (R), green (G), and blue (B) discharge cells forming a pixel is mixed in position in the pixel. The plasma display panel according to claim 1, wherein: 5. A plasma display in which a gas is discharged to emit light, wherein some of red (R), green (G), and blue (B) discharge cells constituting a pixel are individually or severally arranged. A plasma display panel comprising an aggregate of subcells of the same color that individually emit light, wherein the luminance of each pixel is changed by increasing or decreasing the number of subcells that emit light in the aggregate. 6. A plasma display in which a gas is discharged to emit light, wherein some of red (R), green (G), and blue (B) discharge cells constituting a pixel are individually or severally. A plasma display panel comprising an aggregate of subcells of the same color that individually emit light, wherein the number of subcells of the same color in each of the aggregates is switched for each subfield constituting one field, and the plasma display panel is lit. 7. A display device, wherein some or all of cells of a plurality of colors constituting a pixel are formed of an aggregate of subcells of the same color which emit light individually or several at a time. 8. A plurality of light-emitting units of a plurality of colors constituting a pixel are composed of an aggregate of sub-light-emission units of the same color that individually or several light-emissions are individually emitted, and the sub-emission light that emits light in the aggregate is provided. A display device, wherein the luminance of each pixel is changed by increasing or decreasing the number of units. 9. A plurality of light-emitting units of a plurality of colors constituting a pixel are formed of a set of sub-light-emitting units of the same color that individually or several light-emitting units individually emit light. A display device, wherein the number of light emission units is switched for each subfield constituting one field and lighted.