JP2009170120A - Plasma display panel, and plasma display using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that deterioration of luminance and resolution occurs and an image quality is degraded to a great extent if a power saving is simply carried out. <P>SOLUTION: In the plasma display having as at least a part of composing elements a plasma panel and a driving means or a means for impressing a voltage on the plasma panel, the plasma panel has at least a plurality of discharging cells as a part of the composing elements, and the discharging cell has, as at least a part of the composing elements, an electrode for impressing a voltage on the discharging cell, a discharging space where discharging is formed, and a phosphor film which emits visible light through excitation by ultraviolet ray generated by the discharging, and there is a distribution of a luminance inside a panel where the luminance becomes lower gradually from a panel central portion to a panel peripheral portion, and a luminance ratio in the panel (a panel peripheral portion/panel central portion) (P) is 0.4≤P≤0.8. As a result, a power saving plasma panel can be provided. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a plasma display panel (hereinafter also referred to as “plasma panel”) used for a flat-screen television and the like, and a plasma display device (hereinafter also referred to as “plasma display”) using the plasma display panel. Concerning coexistence of

  Plasma displays are increasing in size and brightness as thin flat displays. In addition, full HD (High Definition) compatibility (high definition) is also required for future high-resolution digital broadcasting.

  In addition, global warming has become a major problem in recent years, and it is necessary to promote low power consumption in electrical products such as the 6% reduction in energy indicated in the Kyoto Protocol. However, increasing the size, increasing the brightness, and increasing the definition of the plasma display panel leads to an increase in power consumption, and therefore, it is necessary to develop a technology that leads to lower power consumption.

  At present, global warming has become a global problem, and as shown in the Kyoto Protocol for the prevention of global warming, it is essential to reduce energy consumption. It is necessary to promote power generation. However, simply reducing the power consumption causes a problem that the luminance and resolution are deteriorated and the image quality is greatly deteriorated. Furthermore, in the future, increasing screen size, increasing brightness, and increasing definition will lead to an increase in power consumption.

  The present invention solves the above-described problems and makes it possible to achieve both low power consumption and high image quality maintenance in a plasma display.

  A luminance distribution is provided in the plasma panel screen so that the luminance gradually decreases from the screen center to the screen periphery.

  According to the present invention, it is possible to achieve both reduction in power consumption and maintenance and improvement of image quality in a plasma panel.

  Embodiments of the present invention will be described in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiments, and the repetitive description thereof will be omitted. In the following embodiments, the description of the same or similar parts will not be repeated in principle unless particularly necessary. Further, in the present application, the “front substrate” and the “back substrate” refer to the front substrate and the display surface that pass through the light emitted from the phosphor from the discharge space and become the display surface when both are assembled into a panel. The one that does not become the back substrate.

  FIG. 1 is a cross-sectional view of an essential part schematically showing a plasma panel studied by the present inventors. In FIG. 1, the front substrate 1 is shown separated from the rear substrate 6 for easy understanding of the structure.

  As shown in FIG. 1, a bus electrode 2, a transparent electrode 3, a dielectric 4, and a protective film 5 are sequentially arranged on the front substrate 1. On the other hand, an address electrode 9 and a dielectric 8 are arranged on the back substrate 6 so as to cover it. Further, a partition wall 7 and a fluorescent film 10 between adjacent partition walls 7 are disposed on the dielectric 8. By disposing the front substrate 1 and the back substrate 6 so as to face each other, a discharge space is formed between the front substrate 1 and the back substrate 6 to constitute a plasma panel.

  In the plasma panel, an electric discharge is generated in each cell, converted into ultraviolet light by a rare gas filled in the cell, and further converted into visible light by a phosphor to display an image. ing.

  Generally, since the plasma panel is configured by arranging cells having the same structure, the luminance in the screen is almost constant. Here, in order to reduce the power consumption, it is necessary to reduce the discharge power. In this case, however, there arises a problem that the luminance is lowered and the image quality is greatly deteriorated.

  In view of this, a luminance distribution in which the luminance gradually decreases from the center of the screen to the periphery of the screen is provided in the plasma panel screen shown in the present invention.

In a display using a color cathode ray tube, since the color cathode ray tube has a deflection angle, the luminance decreases from the center of the screen toward the periphery of the screen as the deflection angle increases.
However, it is insensitive to changes in luminance that gradually change as human visual characteristics.
For this reason, it is known that there is no problem in the image quality of the display if the peripheral brightness of the screen is 40% or more compared to the central brightness of the screen in a display using a color cathode ray tube.

  However, in the case of a color cathode ray tube, there is only one electron source, and there is no change in the current value at the center and the periphery of the screen. Even if it occurs, there is no change in power consumption.

  In the case of a plasma panel, since each cell discharges and emits light, if the discharge current of each cell is changed so that the luminance gradually decreases from the center of the screen to the periphery of the screen, the luminance is uniform. Compared with the case, power consumption can be reduced.

FIG. 2 shows a graph of the power consumption ratio (power consumption when the in-screen luminance ratio is 1) with respect to the in-screen luminance ratio (screen peripheral portion / screen central portion).
It can be seen that the power consumption ratio decreases as the screen peripheral luminance decreases, that is, the in-screen luminance ratio (screen peripheral portion / screen central portion) decreases.

  Considering the 6% reduction, which is the target value of the Kyoto Protocol, to prevent global warming, the power consumption needs to be 0.94 or less, and the brightness ratio in the screen is 0.8 or less.

Further, in order to maintain the image quality, there is no problem if the screen peripheral luminance is 40% or more as compared with the screen central luminance as described above. Therefore, the in-screen luminance ratio of 0.4 or more is necessary. The power consumption ratio at this time is 0.8, and the power consumption can be reduced by 20%.

  Therefore, in order to maintain image quality and reduce power consumption in the plasma panel, the screen has a luminance distribution in which the luminance gradually decreases from the center of the screen to the periphery of the screen, and the luminance ratio in the screen (P) Is possible because 0.4 ≦ P ≦ 0.8.

  In the plasma panel, the area of the transparent electrode 3 that forms the discharge region in each cell is gradually reduced from the center of the screen to the periphery of the screen so that the in-screen luminance ratio becomes 0.8. To. In this embodiment, since the discharge area of each cell becomes smaller, the discharge current gradually decreases from the screen center to the screen periphery, and the power consumption can be reduced by 6%. At this time, since the in-screen luminance ratio is 0.4 or more, there is no deterioration in image quality.

  In the plasma panel, the distance between the partition walls of the rear substrate, which is the discharge volume of each cell, is gradually decreased from the center of the screen to the periphery of the screen so that the in-screen luminance ratio becomes 0.8. In this embodiment, since the discharge space of each cell becomes smaller, the discharge current gradually decreases as it goes from the screen center to the screen periphery, and the power consumption can be reduced by 6%. At this time, since the in-screen luminance ratio is 0.4 or more, there is no deterioration in image quality.

  In the shape where each cell of the back substrate as shown in FIG. 3 is surrounded by the partition wall in the plasma panel, the area in the cell of the transparent electrode 3 forming the discharge region in each cell is from the center of the screen. As it goes to the periphery of the screen, it gradually decreases, and the in-screen luminance ratio becomes 0.8. In this embodiment, since the discharge area of each cell becomes smaller, the discharge current gradually decreases from the screen center to the screen periphery, and the power consumption can be reduced by 6%. At this time, since the in-screen luminance ratio is 0.4 or more, there is no deterioration in image quality.

  In the shape of the plasma panel in which each cell of the back substrate is surrounded by the partition as shown in FIG. 3, the volume surrounded by the partition of the back substrate, which is the discharge volume of each cell, is from the center of the screen to the periphery of the screen. As it goes to the part, it is gradually reduced so that the in-screen luminance ratio becomes 0.8. In this embodiment, since the discharge space of each cell becomes smaller, the discharge current gradually decreases as it goes from the screen center to the screen periphery, and the power consumption can be reduced by 6%. At this time, since the in-screen luminance ratio is 0.4 or more, there is no deterioration in image quality.

It is principal part sectional drawing which shows typically the plasma panel which is one embodiment of this invention. It is a graph which shows the relationship between the luminance ratio in a screen (screen peripheral part / screen center part) and power consumption ratio. It is principal part sectional drawing which shows typically the plasma panel which is a form which each cell shown in Example 3 of this invention and the example 4 of actual use has the shape enclosed by the partition of the back substrate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Front substrate 2 ... Bus electrode 3 ... Transparent electrode 4 ... Dielectric 5 ... Protective film 6 ... Back substrate 7 ... Partition 8 ... Dielectric 9 ... Address electrode 10 ... Fluorescent film.

Claims (4)

In a plasma display apparatus having a plasma panel and means for applying a voltage to the plasma panel, that is, a driving means, at least a part of the components,
The plasma panel has at least a plurality of discharge cells as part of the constituent elements,
The discharge cell includes an electrode for applying a voltage to the discharge cell, a discharge gas for forming a discharge, a discharge space in which the discharge is formed, and a fluorescent film that emits visible light when excited by ultraviolet rays generated in the discharge. At least as part of the component,
The brightness in the screen has a distribution that gradually decreases from the center of the screen to the periphery of the screen, and the brightness ratio in the screen (screen periphery / screen center) (P) is
0.4 ≦ P ≦ 0.8
The plasma panel characterized by being. 2. The plasma panel according to claim 1, wherein the discharge current of each of the discharge cells gradually decreases from the center of the screen toward the periphery of the screen. 3. The plasma panel according to claim 2, wherein the area of the discharge electrode provided in each of the discharge cells gradually decreases from the center of the screen to the periphery of the screen. 3. The plasma panel according to claim 2, wherein the discharge volume of each of the discharge cells gradually decreases from the center of the screen to the periphery of the screen.

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