JP2009117050A - Image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve image quality by reducing a delay in discharge, in an image display device such as a PDP using ultraviolet emission generated by discharge. <P>SOLUTION: In this image display device using ultraviolet emission generated by discharge, a compound containing a metal element having a work function of not more than 3.6 eV exists in a portion other than a protective layer, an electrode, glass, and a dielectric layer in a discharge space, and as to this compound, the external quantum efficiency of visible light emission within a range of 450-780 nm due to irradiation of ultraviolet ray having a wavelength of not more than 450 nm is not less than 10%. If the work function of the compound is not more than 2.5 eV, the image quality is more effectively improved, and if it is not more than 2.2 eV, especially remarkable effect can be obtained. In addition, in this image display device using ultraviolet emission generated by discharge, a compound containing a Cs element exists in a portion other than the protective layer, the electrode, the glass, and the dielectric layer, and as to the compound containing the element, the external quantum efficiency of visible light emission within a range of 450-780 nm due to irradiation of ultraviolet ray having a wavelength of not more than 450 nm is not less than 10%. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image display device, and more particularly to an image display device such as a plasma display panel configured using a phosphor that emits light by being excited by ultraviolet rays, particularly ultraviolet rays in a vacuum ultraviolet region.

  In recent years, there has been an increasing demand for thinning a display device typified by a television or a personal computer monitor that does not require a large installation space. As a device that can be made thin, a plasma display device (PDP (Plasma Display Panel) device), a field emission display (FED) device, and a backlight and a thin liquid crystal panel are combined to form a display device. Liquid crystal display (LCD) devices and the like have been actively developed.

  Among them, the PDP device is a display device using a plasma display panel (PDP) as a light emitting device. The plasma display panel (PDP) uses an ultraviolet ray (in the wavelength range of 146 nm and 172 nm when xenon is used as a rare gas) generated in a negative glow region in a minute discharge space containing a rare gas as its excitation source. Luminescence in the visible region is obtained by exciting the phosphor in the phosphor layer disposed in the discharge space and urging the phosphor to emit light. In the PDP device, the amount and color of light emission are controlled and used for display.

  In the PDP device, light emission and non-light emission in image display of individual minute discharge spaces (hereinafter referred to as discharge cells) are adjusted by accumulation of wall charges of the discharge cells. This wall charge is adjusted by generating a discharge called an address discharge before light emission. Therefore, it is very important to display an address discharge accurately in image display.

  In the PDP device, materials that need to be installed in the discharge space, such as phosphor materials and barrier rib materials, also affect the discharge characteristics as described above. A material such as a phosphor is a very important main component in determining the characteristics of the PDP device.

  Examples of documents relating to this type of material and technology include “Patent Document 1”, “Patent Document 2”, “Patent Document 3”, and “Patent Document 4”.

Japanese Patent Laid-Open No. 10-306995 Japanese Patent Laid-Open No. 2003-041251 JP 2003-183649 A JP 2005-239936 JP

  In recent years, PDP devices have been recognized for their high performance, and their use as large-sized flat panel displays and thin TVs are rapidly expanding, replacing monitors and televisions (TVs) that use cathode ray tubes. As a result, further improvement in performance has been demanded. Specifically, in order to display a high-vision by digital broadcasting or the like, it is necessary to increase the resolution. Further, in order to increase the resolution, each display pixel becomes smaller, so that it is necessary to increase the luminance, and high luminous efficiency is also required to achieve the higher luminance.

  Higher resolution means that the number of discharge cells increases. In the PDP device, in order to form one screen, a column of pixels is scanned, the address discharge described above is generated, and pixels to emit light are determined. Normally, one screen display is performed in 1/60 second, but the PDP device further divides it into about 10 for display. For this reason, the time taken for the address discharge in each discharge cell is very short. When the resolution is increased, the number of columns of pixels to be scanned increases, and the time is further shortened. For this reason, when the resolution is increased, it is difficult to accurately perform address discharge. If the address discharge cannot be performed accurately, the screen flickers and the image quality deteriorates.

  Further, in the technical field of PDP devices, as a high-performance TV device, improvement studies of the structure of a plasma display panel (PDP) are being promoted for the purpose of increasing the brightness by increasing the discharge intensity in each discharge cell. Yes.

As one of the methods, studies are actively made to increase the composition ratio of Xe gas in the discharge gas containing Ne as a main component and to actively use the generated Xe ₂ molecular beam. Although it is a technology trend of “high xenon concentration” in so-called PDP panels, it is usually considered to achieve higher light emission efficiency of such PDP panels in a composition ratio region higher than the xenon gas composition ratio (about 4%) in the discharge gas. Has been made.

  However, increasing the xenon concentration often increases the discharge voltage. This increases the burden on the drive circuit and the cost of the apparatus. Further, since the time required for starting the address discharge becomes longer, it is difficult to accurately perform the address discharge.

  PDP devices are increasingly used as flat TV devices that replace TV devices using cathode ray tubes from simple thin display devices. As a result, the demand for image quality is becoming increasingly high, and it is important to improve the image quality by responding to the demand for luminance, reducing power consumption, reducing costs, and reducing screen flicker. For this purpose, in order to improve the image quality, it is important to reduce the time required for the address discharge and generate an accurate discharge.

  An object of the present invention is to solve the above-described problems and provide an image display device with high image quality and high efficiency.

  Of the inventions disclosed in the present application, the outline of typical ones will be briefly described as follows.

  In the image display device using ultraviolet light emission by discharge, a compound containing an element having a work function of 3.6 eV or less in a metallic state is present in a portion other than the protective layer, electrode, glass, and dielectric layer in the discharge space. And the compound containing the element solves the above problem by an image display device characterized in that the external quantum efficiency of visible light emission in the range of 450 nm to 780 nm by irradiation with ultraviolet light of 450 nm or less is 10% or less. Can do. Note that a compound containing an element having a work function of 3.6 eV or less in the metal state is synonymous with a compound containing a metal having a work function of 3.6 eV or less. If the work function of the compound is 2.5 eV or less, it is more effective, and if it is 2.2 eV or less, the effect becomes remarkable.

  Further, when the compound containing the element has an external quantum efficiency of visible light emission in the range of 450 nm to 780 nm by irradiation with ultraviolet light of 450 nm or less, if the compound is mixed with a phosphor, ultraviolet irradiation is performed on the compound. The influence on visible light by can be ignored. Further, if the compound containing the element does not emit visible light in the range of 450 nm to 780 nm when irradiated with ultraviolet light of 450 nm or less, the image quality is not deteriorated at all.

Furthermore, in an image display device using ultraviolet light emission by discharge, a compound containing a Cs element exists in a portion other than the protective layer, electrode, glass, and dielectric layer in the discharge space, and the compound containing the element is The effect is particularly remarkable by an image display device characterized in that the external quantum efficiency of visible light emission in the range of 450 nm to 780 nm by irradiation with ultraviolet light of 450 nm or less is 10% or less. The effect is particularly remarkable by the image display device characterized in that the compound containing Cs is at least one of Cs ₂ CO ₃ , CsHCO ₃ , and CsCH ₃ COO.

  The compound can be introduced into the discharge space by being present in a phosphor layer for performing visible light emission display in the discharge space.

  In addition, the compound is introduced into the discharge space by being installed in at least a part of the partition walls, the front panel, etc. other than the phosphor layer for performing visible light emission display in the discharge space. Is possible.

Further, since the compound is present as a thin film in the phosphor layer for performing visible light emission display in the discharge space, it can be introduced into the discharge space. The film thickness of the thin film is preferably 0.02 μg or more per 1 cm ² in terms of weight. In other words, an effect can be obtained if such a compound has a thickness of about 0.2 atomic layers.

  The effect appears when the weight of the compound in the discharge space is 0.01% or more and 50% or less with respect to the total weight of all phosphors in the discharge space.

  Furthermore, if the weight of the compound present in the discharge space is 0.01% or more and 10% or less with respect to the total weight of all the phosphors in the discharge space, a reduction in luminance as well as a predetermined effect can be prevented. I can do it.

Further, when the weight of the compound present in the discharge space is converted to a panel area of 100 cm ² , the effect appears when the weight is 0.5 mg or more and 250 mg or less.

  In the case where these image display devices are plasma display devices including a gas configured to contain Xe gas in an amount such that the composition ratio of the discharge gas is 6% or more, the effect is further remarkable.

  In addition, when these image display devices are plasma display devices composed of 700 or more display pixel lines, the effect becomes more remarkable.

  According to the configuration of the present invention, since the priming particles in the discharge space can be increased, the time required for the address discharge, that is, the delay time can be shortened. Therefore, multi-gradation display is possible and an excellent image can be obtained.

  Hereinafter, a representative example of the embodiment of the present invention will be shown to explain the effect. The present invention is also effective in configurations other than those shown in the following examples as long as the configurations bring about similar effects.

  FIG. 2 is an exploded perspective view of the main part showing the structure of the PDP according to the present embodiment. 3, 4, and 5 are cross-sectional views showing the main part of the structure of the PDP according to the present embodiment.

  A PDP 100 according to an embodiment of the present invention has a structure for dealing with a so-called surface discharge PDP (reflection type AC drive), a pair of substrates 1 and 6 that are spaced apart from each other, and the substrate 6. Enclosed in a space formed between the pair of substrates 1 and 6 and a partition wall 7 that is provided on the partition 1 and holds the gap between the substrates 1 and 6 when the pair of substrates 1 and 6 are overlaid. And a discharge gas (not shown) that generates ultraviolet rays by discharge, and electrodes 2 and 9 disposed on opposing surfaces of the pair of substrates 1 and 6. 3 shows one cross section along the extending direction of the electrode 2, FIG. 4 shows another cross section along the extending direction of the electrode 2, and FIG. A cross section along the extending direction of the electrode 9 is shown.

  A phosphor for performing light-emitting display constitutes the phosphor layer 10 on one of the pair of substrates 6 and the surface of the partition wall 7. The phosphor constituting the phosphor layer 10 is excited by vacuum ultraviolet rays having wavelengths of 146 nm and 172 nm generated from the discharge gas by discharge, and emits visible light. Here, the discharge space refers to a region surrounded by the dielectric 8, the barrier rib 7 and the protective film 5 in FIG. 2.

  2, 4, and 5 is a bus line 3 made of silver or Cu—Cr that is integrated with the electrode 2 to reduce the electrode resistance. The layers 4 and 8 are dielectric layers 4 and 8, and the layer 5 is a protective film 5 provided for electrode protection. In FIG. 2 taken as an example, the barrier ribs are in a line shape, but may have a rectangular structure that divides each discharge cell.

The phosphor layer 10 is provided with phosphors of three colors of red, green, and blue separately for color display. As examples of phosphors that emit light in respective colors, red phosphors are (Y, Gd) BO ₃ : Eu phosphors, green phosphors are Zn ₂ SiO ₄ : Mn ²⁺ phosphors, and blue phosphors are BAM ( BaMgAl ₁₀ O ₁₇ : Eu ²⁺ ) phosphor. These phosphors are often used as the main component of each color, but materials other than these may be used. In many cases, the average particle diameter of the phosphor is 1 to 5 μm, but phosphors having other particle diameters may be used.

  FIG. 6 shows an example of the voltage applied to each electrode. The Y electrode and the X electrode are adjacent electrodes 2 in FIG. 2, and light emission display is performed by a discharge (sustain discharge) between the two electrodes. The voltage for the sustain discharge is applied simultaneously in all the discharge cells. For this reason, it is necessary to select a discharge cell that discharges to emit light and a discharge cell that does not emit light. This is performed by causing a discharge between the A electrode and the Y electrode. The A electrode is the electrode 9 in FIG.

  When selecting a discharge cell to emit light, a voltage is simultaneously applied to the A electrode and the Y electrode orthogonal thereto. Only in the discharge cells applied simultaneously, discharge occurs between the A electrode and the Y electrode (address discharge). At this time, charges are accumulated in the discharge cells. The voltage between the Y electrode and the X electrode is set to a voltage that does not start discharge by itself. Only when the voltage due to the accumulated charge is added to the voltage between the Y electrode and the X electrode, the discharge is started. Therefore, light emission due to the discharge occurs only in the discharge cell in which the address discharge is generated, and an image can be formed.

  In addition, since the discharge cell in which the wall charges are once formed always generates a sustain discharge thereafter, it is necessary to eliminate the wall charges in order not to emit light. Therefore, before applying the voltage for address discharge, a voltage is applied to erase wall charges in all the discharge cells. This is the reset voltage, and the time for applying this is the reset period.

  The voltage application sequence shown in FIG. 6 is for a period called a subfield. One image is formed by a period called one field. In order to make a difference in luminance of each pixel that forms one image, one field is divided into about 10 subfields, and a series of discharges are performed in each subfield.

  The address discharge is performed while scanning the pixel rows one by one. Therefore, when the definition is increased and the number of pixels is increased, the number of rows of pixels to be scanned is increased and the time required for one address discharge is reduced.

  In the discharge cell, when a voltage is applied, a small amount of charged particles in the discharge space move due to an electric field, and when it collides with the discharge gas, further charged particles are produced, and the process Is repeated to start discharging. Charged particles present in a very small amount in the discharge space that are necessary for starting the discharge are called priming particles.

  One factor that determines the time at which address discharge occurs is the amount of priming particles that are present when a voltage is applied. The discharge is started after the number of charged particles necessary to start the discharge is formed after the voltage is applied. The time required for starting the discharge is called a discharge delay time. When the number of priming particles is small, it takes time to form the number of charged particles necessary for the start of discharge, and the discharge delay time becomes long. In order to shorten the address discharge time, it is necessary to shorten the discharge delay time, and increasing the amount of priming particles is one means for that purpose.

  The priming particles are formed by the sustain discharge, and the number decreases as time passes from the sustain discharge. For this reason, the time from the end of the sustain discharge to the start of the address discharge is important. As an example of this time, it is about 0.2 ms in the first line of the pixel column scan for performing address discharge, and about 1.2 ms in the last line.

  One object of the configuration of the present invention is to shorten the time required for address discharge in order to accurately perform address discharge. The time required for address discharge is called the discharge delay time. By adopting the configuration of the present invention, it is possible to increase the amount of priming particles during address discharge. Therefore, the time required for address discharge is shortened, and the delay time of address discharge is shortened.

  The priming particles are released from a protective layer or the like in the discharge cell. This release varies greatly depending on the surface condition. By attaching a specific substance to the surface, it is possible to facilitate the release of priming particles from the surface, and as a result, the amount of priming particles can be increased.

  The inventor has found that when an element having a work function below a certain level in a metallic state is present on the surface of a portion that emits priming particles, such as a protective layer, priming particles increase and address discharge delay time is shortened. I found.

  As a standard of the work function below a certain level, the work function of Mg, which is the main component of the protective layer, is around 3.7 eV. When a metal element having a work function of 3.6 eV or less, which is smaller than this, is used, the above effect can be obtained.

  As a more desirable standard, alkali and alkaline earth metals include elements having a work function of 2.5 eV or less, such as Ba, and are more effective when used. Furthermore, when an element having a work function of 2.2 eV or less, such as Cs, is used, the above effect is particularly remarkable.

  However, these elements having a work function below a certain level and exhibiting the above characteristics are usually highly reactive with oxygen and moisture, and are installed on the surface and further assembled into an image display device. It is not easy. Furthermore, even if these elements are directly adhered to the surface, they are gradually removed from the surface by plasma discharge, resulting in deterioration of characteristics during use, and the effect is not sufficient.

  Therefore, in the present invention, the following method is performed in order to obtain sufficient effects. That is, for example, the compound of the element is placed in a portion other than the surface of the protective layer that is normally involved in priming particle emission. These adhere to the surface of the site where priming particles are released by heating in the manufacturing process, plasma discharge, or the like, and the effect of facilitating priming particle emission can be obtained. Even if the surface of the part from which the priming particles are emitted is removed by plasma discharge, this effect is supplied again from the compound of the element installed in the other part, so that the effect is sustained. Examples other than the surface of the protective layer include the upper part of the partition wall or the side part of the partition wall.

In addition, these introduced elements may directly release the priming particles from the position where they are initially set or may have an effect of facilitating the release. Priming particles due to these effects are also effective in increasing priming particles for address discharge. Also, these installation locations are not sufficiently effective in the electrodes, dielectric layers, glass interiors, and the like. Furthermore, this time, it was found that at least one of Cs ₂ CO ₃ , CsHCO ₃ , and CsCH ₃ COO is particularly effective as a compound to be introduced.

  Further, if these introduced compounds emit visible light, unnecessary light is added to the light emission display of the image, which is affected. This results in a decrease in color reproducibility and a change in luminance life, making product design difficult. Therefore, these compounds need to be such that visible light emission by ultraviolet light does not affect the image. That is, it is desirable that these compounds have no visible light emission by ultraviolet light. Even when there is light emission, the external quantum efficiency of visible light emission in the range of 450 nm to 780 nm by irradiation with ultraviolet light of 450 nm or less needs to be 10% or less. Here, the external quantum efficiency is a value indicating the ratio of the number of photons emitted from the compound to the outside with respect to the number of photons incident on the compound, and can be measured with a commercially available measuring device or the like. .

  In addition, as a configuration of the present invention described above, the compound can be introduced by mixing or multilayering the phosphor layer for performing visible light emission display in the discharge space. . Furthermore, as another configuration of the present invention described above, the introduction of the above-described compound is a protective layer, electrode, dielectric layer, glass other than the phosphor layer for performing visible light emission display in the discharge space. It is also possible to be installed in a part of the front panel other than the inside of the partition, for example. Here, for example, when the compound is mixed in the protective layer, the life of the protective layer may be adversely affected.

  For the reasons described above, the present invention is particularly effective when used in a plasma display device including a gas that includes Xe gas in an amount such that the composition ratio of the discharge gas is 6% or more. Further, the present invention is particularly effective when used for a plasma display device constituted by 700 or more display pixel lines for the reasons described above.

  Hereinafter, examples corresponding to the best mode for carrying out the present invention will be described.

A PDP which is an example according to the present invention was manufactured. As phosphors of three colors, red, green, and blue, red phosphor is (Y, Gd) BO ₃ : Eu phosphor, green phosphor is Zn ₂ SiO ₄ : Mn ²⁺ phosphor, and blue phosphor is BAM ( BaMgAl ₁₀ O ₁₇ : Eu ²⁺ ) phosphor was used as the main component of each color. However, the effect of the present invention is also effective when other materials than these are used as the main component of each color of the phosphor.

A predetermined amount of a compound containing an element satisfying the conditions of the present invention was mixed with each of the main phosphors of each color to produce the image display device of the present invention. Examples of compounds that satisfy the above conditions include Cs ₂ CO ₃ , CsHCO ₃ , CsCH ₃ COO, and the like. At least one of these compounds was mixed in the range of 0.01 wt% to 50 wt% to prepare PDP 100, which is the image display device of the present invention shown in FIG. The compounds are exemplified above, but the compounds to be mixed are not limited to these, and it is effective to use compounds other than the above compounds as long as they satisfy the conditions of the present invention.

  In the PDP 100 of the surface discharge type color PDP device as in the present embodiment, for example, a negative voltage is applied to one of the pair of display electrodes (electrode 2) (generally called a scan electrode) and the address electrode (electrode 9). A discharge is generated by applying a positive voltage (positive voltage compared to the voltage applied to the display electrode) to the other remaining display electrode (electrode 2). A wall charge is formed to assist in starting the discharge (referred to as writing). When an appropriate reverse voltage is applied between the pair of display electrodes in this state, a discharge is generated in the discharge space between the electrodes 2 via the dielectric layer 4 (and the protective film 5).

  When the voltage applied to the pair of display electrodes (electrode 2) is reversed after the discharge is completed, a new discharge is generated. By repeating this, a discharge is continuously generated (this is called a sustain discharge or a display discharge).

  In the PDP 100 according to this embodiment, an address electrode (electrode 9) made of silver or the like and a dielectric layer 4 made of a glass-based material are formed on a rear substrate (substrate 6), and then the same. The partition wall 7 made of a glass-based material is printed on a thick film, and the partition wall 7 is formed by blast removal using a blast mask.

  Next, phosphor layers 10 of red, green and blue are sequentially formed in stripes on the partition walls 7 so as to cover the groove surfaces between the corresponding partition walls 7. Here, each phosphor layer 10 corresponds to red, green, and blue, and 40 parts by weight of a mixture of the red phosphor particles and the compound (60 parts by weight of the vehicle), and green phosphor particles and the compound. 40 parts by weight of the mixture (60 parts by weight of the vehicle), 35 parts by weight of the mixture of the blue phosphor particles and the compound (65 parts by weight of the vehicle), mixed with the vehicle to form a phosphor paste, and applied by screen printing After that, the volatile component in the phosphor paste is evaporated and the organic substance is burned and removed by a drying and firing process. The phosphor layer 10 used in this example is composed of each phosphor particle having a median particle diameter of about 3 μm.

  Next, the front substrate (substrate 1) on which the display electrode (electrode 2), the bus line 3, the dielectric layer 4, and the protective film 5 are formed and the rear substrate (substrate 6) are frit-sealed, and the inside of the panel is evacuated. After exhausting, discharge gas is injected and sealed. The discharge gas is a gas that includes xenon (Xe) gas in an amount that results in a composition ratio of 10%. The PDP 100 according to this embodiment has a size of 3 type and a pitch of one pixel of 1000 μm × 1000 μm.

  Next, a plasma display device, which is a display device configured to display an image using the PDP according to the embodiment of the present invention in combination with a driving circuit that drives the PDP, was manufactured. This plasma display device has high luminance, excellent display performance, and high luminance display. High-speed address discharge is possible, and high-definition and high-quality image display is possible.

FIG. 1 shows the relationship between the discharge delay time of the image display device of the present invention and the phosphor mixture amount satisfying the condition of the present invention. In FIG. 1, the horizontal axis represents the ratio of the amount of Cs ₂ CO ₃ mixed with the light emitting phosphor, and the vertical axis represents the time required for address discharge, that is, the discharge delay time. As the light-emitting phosphors, experiments were carried out on three-color phosphors of red, green, and blue, and each phosphor showed the same tendency. FIG. 1 is an average value of the results of experiments conducted on red, green, and blue phosphors. Further, the measured delay time is measured under the operating condition in the case where the interval between the sustain period and the address period in FIG. 6 is 10 ms. That is, the discharge delay time is about 57% by mixing 1% of the compound, and about 44% by mixing 10%. Thus, the effect of shortening the discharge delay time according to the present invention is very large.

  According to the present invention, even a high-definition image display device having 700 or more pixel display lines can display an image with good image quality without causing a decrease in image quality such as flicker. Also, in the plasma display, when the Xe concentration is 6% or more, there is a tendency that the address discharge time tends to be long, but by using the present invention, even if the Xe concentration is 6% or more, there is no image quality deterioration such as flickering, It is possible to display an image with good image quality.

From FIG. 1, it can be seen that even if the mixing amount is extremely small, it is effective to obtain good characteristics. That is, the discharge delay time is shortened by 18% only by containing 0.1% of Cs ₂ Co ₃ . On the other hand, if the mixing amount exceeds 50% by weight, the emission intensity for displaying an image is remarkably lowered, which is not preferable. Considering the luminance of the image display device, the mixing amount is preferably about 0.01% to 10%.

Since the phosphor weight per 100 cm ^{2 of} panel area is about 500 mg, the weight of the compound per 100 cm ² of panel area is 0.5 mg to 250 mg, more preferably 0.5 mg to 50 mg.

Further, when the phosphors having the following compositions are used as the red, green, and blue phosphors, PDPs can be similarly produced. That is, as the red phosphor, any one or more of (Y, Gd) BO ₃ : Eu, (Y, Gd) ₂ O ₃ : Eu, and (Y, Gd) (P, V) O ₄ : Eu are used. It is possible to include a phosphor. The green phosphor may include one or more phosphors of YBO ₃ : Tb, (Y, Gd) BO ₃ : Tb, BaMgAl ₁₄ O ₂₃ : Mn, and BaAl ₁₂ O ₁₉ : Mn. Is possible. The blue phosphor is a kind selected from the group consisting of CaMgSi ₂ O ₆ : Eu, Ca ₃ MgSi ₂ O ₈ : Eu, Ba ₃ MgSi ₂ O ₈ : Eu, and Sr ₃ MgSi ₂ O ₈ : Eu. It is possible to include the above blue phosphor.

  The phosphors listed above are examples of commonly used phosphors, and the effects of the present invention are effective regardless of the type of phosphor used. Even when a phosphor other than the above is used, the image display device of the present invention can be manufactured.

  The invention made by the present inventor has been specifically described based on the embodiments and examples. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say.

  A PDP which is an example according to the present invention was manufactured. The basic structure, phosphor material, and manufacturing method are the same as in Example 1.

  The difference from Example 1 is that a compound containing an element satisfying the conditions of the present invention is not mixed with red, green, and blue phosphors for display, but the surface of the dielectric layer 6, the upper surface of the partition wall 7, and The image display device of the present invention was manufactured by forming a predetermined amount on at least a part of the side surface.

  As a specific example of the production method, a predetermined amount was applied to the surface of the dielectric layer 6 and at least a part of the upper surface and side surfaces of the partition wall 7 before forming the phosphor layer 10. A phosphor layer 10 was further formed thereon. The image display device of Example 2 showed good characteristics similar to Example 1.

  A PDP which is an example according to the present invention was manufactured. The basic structure, phosphor material, and manufacturing method are the same as in Example 1.

  The difference from Example 1 is that a compound containing an element satisfying the conditions of the present invention is not mixed with the red, green, and blue phosphors for display, but the surface of the phosphor 10, the upper surface and the side surface of the partition wall 7. The image display device of the present invention was manufactured by forming a predetermined amount on at least a part of the image display device.

  As a specific example of the manufacturing method, after the phosphor layer 10 was formed, a predetermined amount was applied to the surface of the phosphor 10 and at least one part of the upper surface and side surfaces of the partition wall 7. The image display device of Example 2 showed good characteristics similar to Example 1.

  A PDP which is an example according to the present invention was manufactured. The basic structure, phosphor material, and manufacturing method are the same as in Example 1.

  The difference from Example 1 is that a compound containing an element satisfying the conditions of the present invention is not mixed with red, green and blue phosphors for display, but a predetermined amount is formed on at least a part of the substrate 1 side. Thus, the image display device of the present invention was produced. The image display device of Example 3 showed good characteristics similar to Example 1.

  A PDP which is an example according to the present invention was manufactured. The basic structure, phosphor material, and manufacturing method are the same as in Example 1.

  The difference from Example 1 is that a compound containing an element satisfying the conditions of the present invention is not mixed with red, green and blue phosphors for display, but is formed as a thin film on at least a part of the substrate 1 side. Thus, the image display device of the present invention was produced.

The amount of the thin film was changed and the characteristics were examined. As a result, an effect appeared when the weight of the metal element or Cs element satisfying the conditions of the present invention in the thin film was 0.02 μg or more per 1 cm ^{2 of} the thin film area. This weight can be measured by analytical means such as Zeeman atomic absorption analysis (ZAAS) and X-ray fluorescence analysis (XRF). The image display device of Example 5 showed good characteristics similar to Example 1.

  A PDP which is an example according to the present invention was manufactured. The basic structure, phosphor material, and manufacturing method are the same as in Example 1.

  The difference from Example 1 is that a compound containing an element satisfying the conditions of the present invention is not mixed with red, green, and blue phosphors for display, but is formed as a thin film on at least a part of the substrate 6 side. Thus, the image display device of the present invention was produced. As a specific example of the manufacturing method, before forming the phosphor layer 10, a thin film was formed on the surface of the dielectric layer 6 and at least a part of the upper surface and side surfaces of the partition wall 7. A phosphor layer 10 was further formed thereon.

The amount of the thin film was changed and the characteristics were examined. As a result, an effect appeared when the weight of the metal element or Cs element satisfying the conditions of the present invention in the thin film was 0.02 μg or more per 1 cm ^{2 of} the thin film area. This weight can be measured by analytical means such as Zeeman atomic absorption analysis (ZAAS) and X-ray fluorescence analysis (XRF). The image display device of Example 6 showed good characteristics similar to those of Example 1.

  A PDP which is an example according to the present invention was manufactured. The basic structure, phosphor material, and manufacturing method are the same as in Example 1.

  The difference from Example 1 is that a compound containing an element satisfying the conditions of the present invention is not mixed with red, green, and blue phosphors for display, but is formed as a thin film on at least a part of the substrate 6 side. Thus, the image display device of the present invention was produced. As a specific example of the manufacturing method, after forming the phosphor layer 10, a thin film was formed on at least a part of the surface of the phosphor layer 10 and the upper and side surfaces of the partition walls 7.

The amount of the thin film was changed and the characteristics were examined. As a result, an effect appeared when the weight of the metal element or Cs element satisfying the conditions of the present invention in the thin film was 0.02 μg or more per 1 cm ^{2 of} the thin film area. This weight can be measured by analytical means such as Zeeman atomic absorption analysis (ZAAS) and X-ray fluorescence analysis (XRF). The image display device of Example 7 showed good characteristics similar to Example 1.

It is a graph which shows the relationship between the mixing amount of Cs compound, and discharge delay time. It is a principal part disassembled perspective view which shows the structure of the plasma display panel which is an image display apparatus of one embodiment of this invention. It is principal part exploded sectional drawing which shows the structure of the plasma display panel which is an image display apparatus of one embodiment of this invention. It is principal part exploded sectional drawing which shows the structure of the plasma display panel which is an image display apparatus of one embodiment of this invention. It is principal part exploded sectional drawing which shows the structure of the plasma display panel which is an image display apparatus of one embodiment of this invention. It is a schematic diagram which shows the time change of the voltage applied to each electrode of the plasma display panel which is an image display apparatus of one embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 6 ... Board | substrate 2, 9 ... Electrode 3 ... Bus line 4, 8 ... Dielectric layer 5 ... Protective film 7 ... Partition 10 ... Phosphor layer 100 ... PDP

Claims (16)

  In an image display device using ultraviolet light emission by discharge, a compound containing a metal element having a work function of 3.6 eV or less exists in a portion other than the protective layer, the electrode, the dielectric layer, and the inside of the glass, and contains the element. An image display device, wherein the compound has an external quantum efficiency of 10% or less of visible light emission in a range of 450 nm to 780 nm when irradiated with ultraviolet light of 450 nm or less.   In an image display device using ultraviolet light emission by discharge, a compound containing a metal element having a work function of 2.5 eV or less exists in a portion other than the protective layer, the electrode, the dielectric layer, and the inside of the glass, and contains the element. An image display device, wherein the compound has an external quantum efficiency of 10% or less of visible light emission in a range of 450 nm to 780 nm when irradiated with ultraviolet light of 450 nm or less.   In an image display device using ultraviolet light emission by discharge, a compound containing a metal element having a work function of 2.2 eV or less exists in a portion other than the inside of the protective layer, the electrode, the dielectric layer, and the glass, and contains the element. An image display device, wherein the compound has an external quantum efficiency of 10% or less of visible light emission in a range of 450 nm to 780 nm when irradiated with ultraviolet light of 450 nm or less.   In an image display device using ultraviolet light emission by discharge, a compound containing a Cs element exists in a portion other than the protective layer, the electrode, the dielectric layer, and the inside of the glass, and the compound containing the element has an ultraviolet ray of 450 nm or less. An image display device characterized in that an external quantum efficiency of visible light emission in a range of 450 nm to 780 nm by light irradiation is 10% or less. The image display device according to claim 4, wherein the compound containing Cs is at least one of Cs ₂ CO ₃ , CsHCO ₃ , and CsCH ₃ COO.   5. The image display device according to claim 1, wherein the compound is present in a phosphor layer for performing visible light emission display in a discharge space.   5. The compound according to claim 1, wherein the compound is disposed in at least a part of a partition wall, a front panel, or the like other than a phosphor layer for performing visible light emission display in a discharge space. Image display device.   5. The image display device according to claim 1, wherein a weight of the compound in the discharge space is 0.01% or more and 50% or less with respect to a total weight of all phosphors in the discharge space. .   5. The image display device according to claim 1, wherein a weight of the compound in the discharge space is 0.01% or more and 10% or less with respect to a total weight of all phosphors in the discharge space. . 5. The image display device according to claim 1, wherein the weight of the compound in the discharge space is 0.5 mg or more and 250 mg or less in terms of a panel area of 100 cm ² .   5. The image display device according to claim 1, wherein the compound is present as a thin film in a phosphor layer for performing visible light emission display in a discharge space.   The compound is present as a thin film in at least a part of a partition wall, a front panel or the like other than a phosphor layer for performing visible light emission display in a discharge space. 5. The image display device according to 1 to 4. 11. The thin film formed by the compound, wherein the weight of the metal element or the Cs element according to any one of claims 1 to 3 existing in the thin film is 0.02 μg or more per 1 cm ^{2 of} the thin film area. The image display device described.   5. The image display device according to claim 1, wherein the image display device is a plasma display device including a gas containing Xe gas in an amount such that the composition ratio of the discharge gas is 6% or more. Display device.   5. The image display device according to claim 1, wherein the image display device is a plasma display device composed of 700 or more display pixel lines.   5. The image display device according to claim 1, wherein the compound does not emit visible light in a range of 450 nm to 780 nm when irradiated with ultraviolet light of 450 nm or less.

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