WO2010016140A1 - Planar display panel control method and plasma display panel control method - Google Patents

Abstract

Provided is means for substantially equalizing at least two colors for the saturation luminance characteristic of a fluorescent body of a plasma display panel and realizing color balance adjustment by a drive circuit for a change of a display load ratio only by the blue color. More specifically, (Y, Gd) PVO₄: Eu is used as a material of a red fluorescent body layer (28R) and Zn2SiO₄: Mn is used as the material of a green fluorescent body layer (28G). The two fluorescent bodies have a substantially identical feature of the relative luminance with respect to the number of display discharges . Accordingly, by reducing the number of display discharges of the blue fluorescent body layer (28B), it is possible to easily adjust the relative luminance.

Description

Method for controlling flat display panel and method for controlling plasma display panel

The present invention relates to control of a plasma display panel, and more particularly to saturation luminance characteristics of a phosphor of the plasma display panel.

The technological development of the plasma display panel (PDP), which is a self-luminous device, is proceeding in the direction of higher image quality and higher quality. At the same time, there is an increasing demand for cost reduction. One of the problems for providing a high-quality PDP is suppression of a decrease in the number of colors (the number of gradations).

The display color of the display device using the PDP is determined by the balance between the emission color and emission intensity of the phosphor and the discharge gas, and an optical filter that adjusts the emission color. However, when the emission intensity balance of the red, green, and blue phosphors changes according to the display load, it is necessary to correct this by adjustment by the drive circuit. When such correction is performed, the image quality deteriorates due to a decrease in gradation.

A green phosphor _{Z n2 S i O 4: M} n is mainly used in the current PDP for chromaticity good high luminance. However, the increase rate of the brightness of Z _n2 S _i O ₄ : M _n decreases as the display load factor decreases and the number of discharge pulses increases. Such a characteristic is generally called a luminance saturation characteristic, and the luminance saturation of the phosphor is relatively large.

On the other hand _(Y, G _d) as a relatively small green phosphor luminance saturation BO 3: _{T b} and the like. The phosphor _Z n2 _S i _O 4: It is preferable driving voltage is lower than the _{M n.} However, since the emission color of (Y, G _d ) BO ₃ : T _b is yellowish green, it is difficult to use it alone as a green phosphor. Therefore, when it is necessary to apply the same phosphor, it is often mixed with _{Zn 2} S _i O ₄ : M _n or the like having good color purity.

The red phosphor (Y, G _d ) BO ₃ : E _u has a small luminance saturation, a high luminance and a small luminance deterioration, and is mainly used in the current PDP. On the other hand, (Y, G _d ) BO ₃ : E _u has orange light emission having a peak at a wavelength of about 593 [nm]. For this reason, a display device using a PDP using this phosphor contains a dye that absorbs unnecessary orange light in an optical filter disposed in front of the PDP for the purpose of displaying red with sufficient color purity. It is necessary to let In addition, since (Y, G _d ) PVO ₄ : E _u used as a red phosphor has good color purity, the optical filter does not need to contain a dye necessary for (Y, G _d ) BO ₃ : E _u. Sufficient red purity can be obtained. As a result, the cost can be reduced and the color of the filter due to the same pigment can be eliminated, so that the unnatural color of the reflected color (object color) when the display device is not lit can be reduced. In addition, the 1/10 afterglow time (time until the luminance is attenuated to 1/10) is about 1/2 of (Y, G _d ) BO ₃ : E _u , and the video display performance can be improved. Is also preferable. On the other hand, luminance saturation is larger than that of (Y, G _d ) BO ₃ : E _u , and is approximately the same as that of the green phosphor Z _n2 S _i O ₄ : M _n .

The blue phosphor mainly used for the _{PDP, B a M g Al 10} O 17: E u and _{C a M g S i2 O 6} : There is _{E u} like, both luminance saturation in each phosphor of the Smaller than that.

In general, since the PDP has an upper limit on the input power, the number of display discharges varies depending on the display load factor (ratio of the number of lighted cells in all cells). Therefore, for example, the chromaticity in the white display changes depending on the display load factor due to the difference in the luminance saturation characteristics of the phosphors. To correct for this, to adjust the balance of each color to the display load factor by the drive circuit (hereinafter, referred to as DCB (D ynamic C olor B alance )). In particular, the chromaticity change in the deviation direction is more conspicuous than the chromaticity change in the color temperature direction.

Other white balance adjustment is a control that affects the number of colors by the drive circuit. In this adjustment, the white chromaticity at the reference display load factor is adjusted to a desired value. If the chromaticity difference between before and after the adjustment is large, the decrease in the number of colors is large as in the case of the adjustment by DCB. Decrease is a significant problem. To avoid this, the balance of each color should be adjusted so that the white chromaticity of the panel in combination with the optical filter that is placed in front of the panel and performs color adjustment is the chromaticity set for the TV. good. For the balance adjustment of each color, for example, the film thickness of each phosphor is adjusted. This is because phosphors generally applied to PDPs are highly reflective and play a role of light emitting and reflecting layers themselves, so that the thicker the phosphor film is, the higher the reflection and the higher the brightness. If the thickness of the phosphor is too thick, the drive space cannot be secured because the discharge space is narrowed. Therefore, the phosphor is designed to have an appropriate value including the above color balance. Other methods for adjusting the color balance of each color include adjusting the pitch of the partition walls, adjusting the aperture ratio of each color, and the like, and any method may be used.

Generally, multiple white settings for TV use can be selected. The preferred white color temperature varies from country to country. For example, in a Japanese TV, the color temperature is usually set to around 10000 [K]. In addition to being used in a setting called dynamic mode or standard mode, it is often used in a dark environment. A setting of a color temperature of about 6500 [K], generally called a cinema mode, for watching a movie is also used. In order to realize a plurality of reference whites having different color temperatures, it is necessary to adjust the number of colors of each color by the drive circuit. Since televisions are required to improve image quality in a balanced manner in various modes, it is preferable to eliminate factors that reduce the number of colors of each color as much as possible.

Moreover, since it is necessary to enhance the expressiveness of the skin color especially in the image quality for television applications, it is particularly preferable to use it without reducing the number of red and green colors.

In recent years, high-definition broadcasting has become widespread, and it is considered preferable that the chromaticity values of the three primary colors of TV satisfy the high-definition broadcasting standard (HDTV standard), which is one guideline for designing the chromaticity of each color. In addition, it is said that a standard that realizes more faithful color reproducibility that is not restricted by the above standard called an extended color space will be widespread in the future, and a chromaticity design that meets the needs is required.

A control method for suppressing color temperature and deviation within a predetermined range with respect to a change in display load factor is disclosed in Japanese Patent No. 3580732 (Patent Document 1).

Japanese Patent Laid-Open No. 2007-262408 (Patent Document 2) discloses (Y, Gd) Al ₃ (BO ₃ ): E _u ³⁺ with improved luminance saturation characteristics as a red phosphor material.
Japanese Patent No. 3580732 JP 2007-262408 A

Conventionally, the luminance saturation characteristics of phosphors of various colors have varied.

FIG. 10 is a graph showing the luminance saturation characteristics of the conventional embodiment.

In this embodiment, (Y, Gd) BO ₃ : Eu is used as the phosphor material for the red phosphor layer, Z _n2 S _i O ₄ : M _n is used as the phosphor material for the green phosphor layer, and the blue phosphor layer is used. _B a _M g _Al 10 _O 17 as the phosphor material were used: _{E u.} In this case, as shown in the figure, the luminance saturation characteristics of all the phosphors of red, green, and blue are scattered, so when correcting the white chromaticity with respect to the change in the display load factor, the number of colors of at least two colors is set. It needs to be lowered. In this example, the number of red and blue discharge pulses for green was reduced according to the reduction rate of the display load factor, but the number of colors including flesh color was greatly reduced and the image quality was lowered.

As described above, there is a problem that the gradation of a plurality of colors is lowered when performing white color correction for the display load factor. Further, there may be a problem that complicated control is required when balancing the three colors of RGB (red, green, and blue).

Patent Document 1 mentions only the correction of green having the highest luminance saturation and the correction of blue having the smallest luminance, and red color correction is not taken into account, so that control of color temperature and deviation is not sufficient.

Also, Patent Document 2 does not consider the relationship with the luminance saturation characteristics of phosphors other than red phosphors.

Furthermore, when the color to be corrected is red or green, there is a problem that the gradation expression power of skin color, which is important for a television, is lowered.

An object of the present invention is to provide means for realizing at least two colors substantially equal in saturation luminance characteristics of a phosphor of a plasma display panel and realizing color balance adjustment by a drive circuit with respect to a change in display load factor only in blue. is there.

The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

The outline of a representative one of the inventions disclosed in the present application will be briefly described as follows.

A flat display panel control method according to a representative embodiment of the present invention is intended for a flat display panel including phosphor layers of three different colors, and two colors of the three color phosphor layers are used. The characteristics of the number of display discharges and the discharge brightness of the phosphor layers are substantially the same, and the number of display discharges of the phosphor layers other than the two-color phosphor layers described above among the three-color phosphor layers is controlled. Thus, the discharge luminance of the flat display panel is controlled.

In this flat display panel control method, the two-color phosphor layers of the target flat display panel are a red phosphor layer and a green phosphor layer, and the other phosphor layers are blue phosphor layers. It is also good.

A plasma display panel control method according to a representative embodiment of the present invention includes a plasma in which a rear substrate side module including phosphor layers of three different colors and a front glass substrate side module including a display electrode are combined. The display panel is to be controlled, and the characteristics of the number of display discharges and the discharge luminance of the two-color phosphor layer among the three-color phosphor layers are substantially the same, and among the three-color phosphor layers The discharge brightness of the plasma display panel is controlled by controlling the number of display discharges of the phosphor layers other than the two-color phosphor layers.

This plasma display panel control method may be characterized in that the two-color phosphor layers are a red phosphor layer and a green phosphor layer, and the other phosphor layers are blue phosphor layers.

In the control method of the plasma display panel, the fluorescent material of the red phosphor layer of the plasma display panel _{(Y, G d) PVO 4} : a _{E u,} the material of the green phosphor layer is _Z n2 _S i _{O 4} : a _{M n,} a blue phosphor layer of material _{B a M g Al 10 O 17} : may be characterized by an _{E u.}

In this plasma display panel control method, the phosphor material of the red phosphor layer of the plasma display panel is (Y, G _d ) BO ₃ : E _u and the material of the green phosphor layer is Z _n2 S _i O _4. : _{M n} and _{(Y, G d) BO 3} : are those where the _{T b} were mixed in a 35:65, a material of the blue phosphor layer _{B a M g Al 10 O 17} : as being a _{E u} Also good.

In this method for controlling a plasma display panel, the phosphor material of the red phosphor layer of the plasma display panel is phosphor powder of (Y, G _d ) PVO ₄ : E _u and (Y, G _d ) BO ₃ : E _u The green phosphor layer is made of _{Zn 2} S _i O ₄ : M _n and (Y, G _d ) BO ₃ : T _b by weight mixture ratio of the phosphor powder. 1: is obtained by mixing in 1, blue phosphor layers of material _{B a M g Al 10 O 17} : may be characterized by an _{E u.}

In this method for controlling a plasma display panel, the phosphor material of the red phosphor layer of the plasma display panel is phosphor powder of (Y, G _d ) PVO ₄ : E _u and (Y, G _d ) BO ₃ : E _u mixing weight ratio of 0.75: is obtained by mixing in 0.75, the green phosphor layer of material _{Z n2 S i O 4: M} n and _{(Y, G d) BO 3} : a _{T b} 0.7 : is obtained by mixing in 0.3, the blue phosphor layer of material _{B a M g Al 10 O 17} : may be characterized by an _{E u.}

In this method for controlling a plasma display panel, the phosphor material of the red phosphor layer of the plasma display panel is phosphor powder of (Y, G _d ) PVO ₄ : E _u and (Y, G _d ) BO ₃ : E _u The green phosphor layer is composed of _{Zn 2} S _i O ₄ : M _n and (Y, G _d ). BO _{3: T b} a weight mixing ratio of 0.4: is obtained by mixing in 0.6, the blue phosphor layer of material _{B a M g Al 10 O 17} : may be characterized by an _{E u.}

The plasma display panel according to the exemplary embodiment of the present invention includes a red phosphor layer, a green phosphor layer, and a blue phosphor layer, and the material of the red phosphor layer is (Y, Gd) PVO ₄ : Eu. It is a mixed material containing a weight mixing ratio X (0.00 = <X = <1.00), and the material of the green phosphor layer is ZnSiO ₄ : Mn with a weight mixing ratio Y (0.00 = <Y = <1. 00) between the weight mixing ratio X and the weight mixing ratio Y,
Y = 0.704X ² −0.0568X + 0.35
It satisfies the following formula.

Among the inventions disclosed in the present application, effects obtained by typical ones will be briefly described as follows.

In the control method of the flat display panel and the plasma display panel according to the representative embodiment of the present invention, since there is no gradation reduction of red and green relating to the adjustment of the white chromaticity with respect to the display load factor, The expression power of skin color (yellow), which is particularly important, is improved.

It is a section perspective view showing the general composition of PDP. It is a graph showing the transmission spectrum of the general optical filter for PDP. It is a graph showing the luminance saturation characteristic of the plasma display panel of 1st Embodiment (adjustment on the basis of the display load factor of 100 [%]). It is a graph showing the luminance saturation characteristic of the plasma display panel of 1st Embodiment (adjustment on the basis of the display load factor of 10 [%]). It is a graph showing the saturation luminance characteristic of the plasma display panel in 2nd Embodiment. It is a graph showing the saturation luminance characteristic of the plasma display panel in 3rd Embodiment. It is a graph showing the saturation brightness | luminance characteristic of the plasma display panel in 4th Embodiment. It is a graph showing the saturation luminance characteristic of the plasma display panel in 5th Embodiment. It is a graph showing the correlation between the specific materials of a red fluorescent substance layer and a green fluorescent substance layer. It is a graph showing the saturation brightness | luminance characteristic of the plasma display panel in conventional embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Premise of implementation)
FIG. 1 is a cross-sectional perspective view showing a general configuration of a PDP.

The PDP 100 includes a front glass substrate side module and a back substrate side module.

The front glass substrate side module is generally formed on the dielectric layer 17 and the dielectric layer 17 formed so as to cover the plurality of X electrodes 5 and Y electrodes 6 formed on the inner surface of the front glass substrate 11. The protective film layer 18 is exposed to the discharge space.

The name of the front glass substrate 11 is “glass substrate”, but the material is not particularly limited. The material of the front glass substrate 11 may be glass, quartz glass, silicon or the like.

The X electrode 5 and the Y electrode 6 are each composed of a transparent electrode 41 and a bus electrode 42 for reducing electric resistance. The X electrode 5 and Y electrode 6 without the transparent electrode 41 and the X electrode 5 and Y electrode 6 without the bus electrode 42 are also included in the range of the present invention.

The transparent electrode 41 is made of a material such as ITO (Indium Tin Oxide).

Bus electrodes 42 are formed, for example, _{C r / C u / C r} ( chromium / copper / chromium) of a three-layer structure or _{A g} (silver). Depending on the electrode material, the color of the reflection seen through the glass substrate is different. In the former, there is almost no coloring, but in the latter, the PDP may appear slightly yellow. Since coloring of the PDP deteriorates the appearance quality, it is adjusted as necessary by an optical filter disposed on the entire surface of the PDP display surface.

The dielectric layer 17 is formed by forming a low melting point glass layer. Specifically, it is formed by applying a paste made of a low-melting glass and a binder on a substrate and baking it.

The protective film layer 18 is provided for the purpose of preventing damage to the dielectric layer 17 due to ion collision caused by discharge during display. Protective film layer 18 is _{M g O, C a O,} S r O, is such a material _{B a} O.

The back substrate module generally has a plurality of address electrodes A formed on the back substrate 21 in a direction crossing the display electrodes, a dielectric layer 27 covering the address electrodes A, and a dielectric between adjacent address electrodes A. It comprises a plurality of stripe-shaped barrier ribs 29 formed on the layer 27, and a phosphor layer 28 formed including a wall surface between the barrier ribs.

The same material (material) as the front glass substrate 11 and the dielectric layer 17 in the front glass substrate side module can be used for the rear substrate 21 and the dielectric layer 27.

The address electrode A is made of, for example, a metal layer such as element symbols Al, Cr, Cu, Ag, Au, or a three-layer structure of Cr / Cu / Cr.

The partition walls 29 can be formed by applying a paste made of low melting point glass and a binder on the inner surface of the back substrate 21 on the dielectric layer 27, drying, and then cutting by sandblasting. Further, when a photosensitive resin is used for the binder, it can be formed by baking after exposure and development using a mask having a predetermined shape.

The phosphor layer 28 is a phosphor that emits light when excited by plasma generated by applying a voltage to the X electrode 5, the Y electrode 6, and the address electrode A. The method for forming the phosphor layer 28 is not particularly limited. For example, the phosphor layer 28 can be formed by applying a paste in which a phosphor is dispersed in a solution in which a binder is dissolved in a solvent between the partition walls 29 and baking it in an air atmosphere. It is necessary to use phosphors corresponding to the three primary colors as the phosphor layer 28. Those corresponding to each color are referred to as a red phosphor layer 28R, a green phosphor layer 28G, and a blue phosphor layer 28B, respectively.

Thereafter, the front glass substrate side module and the rear substrate side module are sealed with a low melting point glass or the like for sealing so that the X electrode 5, the Y electrode 6 and the address electrode A are opposed to each other so as to face each other. A space surrounded by the front glass substrate 11, the rear substrate 21, the partition walls 29 of the rear substrate side module and the sealed outer periphery is filled with a discharge gas. Thereby, the formation of the PDP 100 is completed.

In the present invention, an optical filter having general transmission characteristics as shown in FIG. FIG. 2 is a graph showing a transmission spectrum of a general optical filter for PDP. In the present specification, unless otherwise specified, the phosphor film thickness of each color is adjusted in advance so that the white color of the PDP substantially matches the set value of the display device through the optical filter. In this example, the white color of the display device is the most used dynamic mode and standard mode, and the set value is 12000 [K] and the deviation is 0. As a result, when a cinema mode with a low color temperature is selected, the number of colors of blue mainly decreases due to white balance adjustment. When the cinema mode is set as the main mode, it is desirable to set this chromaticity as a set value. Alternatively, the set value may be adopted so that the decrease in the number of colors due to white balance in both modes becomes substantially uniform.

Unless otherwise specified, DCB is adjusted based on white with a display load factor of 100%, so that when the display load factor decreases, the phosphor with less luminance saturation matches the characteristics of the larger phosphor. Control.

Table 1 summarizes each embodiment. See (Summary) at the end of the sentence for how to view this. In Table 1, there is a description of “number of colors”, which is expressed as a product of each color adjustment value. For example, if the value is 0.5, only half of the maximum number of gradations that can be expressed is shown. It means that there is no key.

Although not shown, the PDP shown in the following embodiment is a DCB that adjusts the number of display discharges of one color phosphor layer among the three color phosphor layers to achieve an appropriate white balance. A control circuit for controlling is provided. The single-color phosphor layer referred to here is, for example, a blue phosphor, and the following embodiment will be described on the assumption of this.

(First embodiment)
Hereinafter, the first embodiment will be described using graphs.

In the present embodiment, (Y, G _d ) PVO ₄ : E _u is used as the material of the red phosphor layer 28R, Z _n2 S _i O ₄ : M _n is used as the material of the green phosphor layer 28G, and the blue phosphor layer _B a _M g _Al 10 _O 17 as a material for 28B: contemplates the use of _{E u.} FIG. 3 is a graph showing the luminance saturation characteristics of the first embodiment.

As is clear from FIG. 3, the luminance saturation characteristics of the red phosphor and the green phosphor are substantially the same. As the display load factor decreases, the red-green luminance decreases relative to blue. Therefore, in order to correct the white chromaticity with respect to the change in the display load factor, the number of blue discharge pulses may be reduced with respect to red and green according to the decrease in the display load factor. For example, when the relative luminance is set to 2.0, the number of display discharges of red and green is about 700 times. At this time, the luminance is reduced by making the number of blue display discharges slightly over 600 times. Make adjustments.

こ の There is almost no decrease in the number of red and green colors due to this correction. As a result, a display device that is particularly excellent in skin tone gradation can be obtained.

Specifically, consider the case where the display load factor is adjusted to 100 [%]. Under this adjustment, the number of colors at a display load factor of 10 [%] is 0.82 for all colors and 1.00 for skin color, and the number of gradations hardly decreases. As a result, the phosphors of the respective colors listed above have sufficiently good chromaticity, and the HDTV standard can be sufficiently exceeded by using the control of the present embodiment.

As a modification of this embodiment, the chromaticity of each color can satisfy the HDTV standard even if the transmission characteristics of the optical filter are substantially equal for each wavelength. In this case, it is not necessary to use an expensive absorbing dye for the optical filter, and there is almost no bluish color due to the dye, so that a television with good appearance quality can be obtained.

In addition, since the red phosphor of this embodiment has a short afterglow time, tailing of a moving image is less noticeable if the difference in the afterglow time is adjusted by adjusting the Mn concentration of the green phosphor. Therefore, it is preferable.

It should be noted that a specific technique for DCB control is not particularly used for the present invention. For example, the technique described in Japanese Patent Laid-Open No. 2001-13920 may be used. There is no problem in adopting other technologies.

On the other hand, if the control or control standard is changed, there is a problem even if the above phosphor is used. FIG. 4 shows the red and green discharges according to the increase rate of the display load factor in order to correct the white chromaticity with respect to the change of the display load factor for the PDP using each phosphor under the conditions of the present embodiment. It is a graph showing the brightness | luminance saturation characteristic at the time of employ | adopting the control which reduces the number of pulses.

As already described, in the present embodiment, the DCB adjustment value is adjusted based on the white color with a display load factor of 100 [%]. However, in the example of FIG. 4, the DCB is adjusted based on white with a display load factor of 10%.

In this case, not only is the number of colors smaller than that adjusted with the display load factor of 100 [%], but also the red and green color adjustment is performed, so that the gradation expression of the skin color is greatly reduced. That is, when the display load factor is 100 [%], the number of colors at the display load factor of 10 [%] is 0.82 for all colors and the skin color is 1.00. On the other hand, when the display load factor of 10 [%] is adjusted as a reference, the number of colors that was 1.00 at the display load factor of 100 [%] is 0.68 for all colors and skin colors, resulting in poor gradation expression. I understand.

Therefore, in adopting this embodiment, it is essential to examine the validity of control and the validity of adjustment.

In the configuration of this embodiment, only the mixing ratio (Y) of the green phosphor was changed to +20, +10, −10, −20%, and it was evaluated whether chromaticity with a display load factor of 10% was anxious. . Under all conditions, the white chromaticity at a display load factor of 10% was slightly shifted, but when Y was changed by ± 10%, the difference was hardly recognized. Further, when Y was changed by ± 20%, a slight difference in chromaticity from the set value was felt. As shown in Table 1, if the difference between the white chromaticity and the set chromaticity at a display load factor of 10% is within 200 [K] in the correlated color temperature (Tcp) and within 2 [MPCD] in deviation, It is inconspicuous.

(Second Embodiment)
Next, a second embodiment will be described.

In this embodiment, (Y, G _d ) PVO ₄ : E _u and (Y, G _d ) BO ₃ : E _u are used as the material of the red phosphor 28R, and the weight mixing ratio of the phosphor powder is 0.75: 0. As a material of the green phosphor 28G, Zn ₂ S _i O ₄ : M _n and (Y, G _d ) BO ₃ : T _b are mixed at a weight mixing ratio of phosphor powder of 0.7: 0.3. mixed _{ones, B a M g Al 10 O} 17 as a material of the blue phosphor 28B: using _{E u.} FIG. 5 is a graph showing the saturation luminance characteristics of the plasma display panel according to the third embodiment.

In this embodiment, the luminance saturation characteristics of the red phosphor and the green phosphor are substantially the same as in the first embodiment. Therefore, in the correction of the white chromaticity with respect to the change in the display load factor, there is almost no decrease in the number of red and green colors (the number of colors at the display load factor of 10 [%]: all colors 0.86, skin color 1.00). . This makes it possible to obtain a display device that is particularly excellent in skin tone gradation expression.

This characteristic makes it possible to obtain a display device excellent in skin tone gradation expression. In addition, the HDTV standard can be realized even with an optical filter by the method of the present embodiment.

In the configuration of this embodiment, only the mixing ratio (Y) of the green phosphor was changed to +20, +10, −10, −20%, and it was evaluated whether the chromaticity with a display load factor of 10% was anxious. Under all conditions, the white chromaticity at a display load factor of 10% was slightly shifted, but when Y was changed by ± 10%, the difference was hardly recognized. Further, when Y was changed by ± 20%, a slight difference in chromaticity from the set value was felt. As shown in Table 1, if the difference between the white chromaticity and the set chromaticity at a display load factor of 10% is within 200 [K] for the correlated color temperature (Tcp) and within 2 [MPCD] for the deviation, It is inconspicuous.

(Third embodiment)
The third embodiment will be described below.

In this embodiment, (Y, G _d ) PVO ₄ : E _u and (Y, G _d ) BO ₃ : E _u are used as the material of the red phosphor 28R, and the weight mixing ratio of the phosphor powder is 0.5: 0. 5 and the green phosphor 28G as materials of Zn ₂ S _i O ₄ : M _n and (Y, G _d ) BO ₃ : T _b at a phosphor powder weight mixing ratio of 0.5: 0.5. mixed _{ones, B a M g Al 10 O} 17 as a material of the blue phosphor 28B: using _{E u.} FIG. 6 is a graph showing the saturation luminance characteristics of the plasma display panel according to the third embodiment.

In this embodiment, the luminance saturation characteristics of the red phosphor and the green phosphor are substantially the same as in the first embodiment. Therefore, in the correction of the white chromaticity with respect to the change in the display load factor, there is almost no decrease in the number of red and green colors (the number of colors at the display load factor of 10 [%]: all colors 0.88, flesh color 1.00). . This makes it possible to obtain a display device that is particularly excellent in skin tone gradation expression.

Also in this embodiment, the HDTV standard could be satisfied by including an optical filter.

In the configuration of this embodiment, only the mixing ratio (Y) of the green phosphor was changed to +20, +10, −10, and −20%, and it was evaluated whether the chromaticity with a display load factor of 10% was anxious. Under all conditions, the white chromaticity at a display load factor of 10% was slightly shifted, but when Y was changed by ± 10%, the difference was hardly recognized. Further, when Y was changed by ± 20%, a slight difference in chromaticity from the set value was felt. As shown in Table 1, if the difference between the white chromaticity and the set chromaticity at a display load factor of 10% is within 200 [K] for the correlated color temperature (Tcp) and within 2 [MPCD] for the deviation, It is inconspicuous.

(Fourth embodiment)
The fourth embodiment will be described below.

In this embodiment, (Y, G _d ) PVO ₄ : E _u and (Y, G _d ) BO ₃ : E _u are used as the material of the red phosphor 28R, and the weight mixing ratio of the phosphor powder is 0.3: 0. 7 and green phosphor 28G as materials of Zn ₂ S _i O ₄ : M _n and (Y, G _d ) BO ₃ : T _b at a phosphor powder weight mixing ratio of 0.4: 0.6. mixed _{ones, B a M g Al 10 O} 17 as a material of the blue phosphor 28B: using _{E u.} FIG. 7 is a graph showing the saturation luminance characteristics of the plasma display panel according to the fourth embodiment.

Also in this embodiment, the luminance saturation characteristics of the red phosphor and the green phosphor are substantially the same as in the first embodiment shown in FIG. Therefore, in the correction of the white chromaticity with respect to the change in the display load factor, there is almost no decrease in the number of red and green colors (the number of colors at the display load factor of 10 [%]: all colors 0.90, flesh color 1.00). . As a result, it is possible to obtain a display device that is particularly excellent in skin tone gradation expression, and in this embodiment, the HDTV standard can be satisfied by including an optical filter.

In the configuration of this embodiment, only the mixing ratio (Y) of the green phosphor was changed to +20, +10, −10, −20%, and it was evaluated whether the chromaticity with a display load factor of 10% was anxious. Under all conditions, the white chromaticity at a display load factor of 10% was slightly shifted, but when Y was changed by ± 10%, the difference was hardly recognized. Further, when Y was changed by ± 20%, a slight difference in chromaticity from the set value was felt. As shown in Table 1, if the difference between the white chromaticity and the set chromaticity at a display load factor of 10% is within 200 [K] in the correlated color temperature (Tcp) and within 2 [MPCD] in deviation, It is inconspicuous.

(Fifth embodiment)
Finally, a fifth embodiment will be described.

In the present embodiment, (Y, G _d ) BO ₃ : E _u is used as the material of the red phosphor layer 28R, and Z _n2 S _i O ₄ : M _n is used as the material of the green phosphor 28G and (Y, G _d ) BO. _{3: T b} 0.35: a mixture with 0.65, blue phosphor 28B materials as _{B a M g Al 10 O 17} : using _{E u,} respectively. FIG. 8 is a graph showing the saturation luminance characteristics of the plasma display panel according to the second embodiment.

In this case, as in the first embodiment shown in FIG. 3, the luminance saturation characteristics of the red phosphor and the green phosphor are substantially equal. Therefore, there is almost no decrease in the number of red and green colors in the correction of white chromaticity with respect to the change in display load factor. That is, in the first embodiment (adjustment at the display load factor of 100 [%]), the number of colors at the display load factor of 10 [%] is 0.82 for all colors and 1.00 for skin color. On the other hand, in this embodiment, the number of colors at a display load factor of 10 [%] is 0.91 for all colors and 1.00 for skin color, and the number of colors as a whole improves.

In the configuration of this embodiment, only the mixing ratio (Y) of the green phosphor was changed to −10 and −20%, and it was evaluated whether the chromaticity with a display load factor of 10% was anxious. Under all conditions, the white chromaticity at a display load factor of 10% was slightly shifted, but when Y was changed by ± 10%, the difference was hardly recognized. Further, when Y was changed by ± 20%, a slight difference in chromaticity from the set value was felt. As shown in Table 1, if the difference between the white chromaticity and the set chromaticity at a display load factor of 10% is within 200 [K] in the correlated color temperature (Tcp) and within 2 [MPCD] in deviation, It is inconspicuous.

(Summary)
Tables 1 and 2 summarize the measurement results of the first to fifth embodiments. The adjustment value of DCB indicates the adjustment ratio of each color luminance by each adjustment.

Summarizing each table, the following relational expression can be found in the mixing ratio of the red and green phosphor layer materials that enable DCB with only one color (blue).

0.704X2-0.0568X + 0.25 ≤ Y ≤ 0.704X2-0.0568X + 0.45 (Formula 1)
X: Mixing ratio of (Y, Gd) PVO4: Eu in the red phosphor Y: Mixing ratio of ZnSiO4: Mn in the green phosphor

FIG. 9 is a graph showing the correlation between specific materials of the red phosphor layer and the green phosphor layer, in which (Equation 1) is graphed. As shown in this figure, it is important for control that the mixing ratios of specific materials in the red and green phosphor layers have a non-linear relationship. That is, it is important that the mixing ratio of the phosphor material is within the hatched area in FIG. Within this range, even if the white chromaticity is slightly deviated, it is not recognized by human eyes.

As mentioned above, the invention made by the present inventor has been specifically described based on the embodiments. 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.

For example, in the above embodiment, the number of display discharges of the blue phosphor is controlled on the assumption that the number of red and green display discharges and the relative luminance are the same, but the blue phosphor and the other color have the same characteristics. You may adjust as follows.

The present invention relates to the manufacture and control of plasma display panels. A display device using a plasma display panel employing the present invention can also be designed.

Claims (11)

1. A method for controlling a flat display panel including phosphor layers of different three colors,
   Among the three-color phosphor layers, the characteristics of the display discharge frequency and discharge luminance of the two-color phosphor layers are substantially the same,
   A flat display panel that controls the discharge luminance of the flat display panel by controlling the number of display discharges of the phosphor layers other than the two-color phosphor layers among the three-color phosphor layers. Control method.
2. 2. The method of controlling a flat display panel according to claim 1, wherein the two color phosphor layers are a red phosphor layer and a green phosphor layer, and the other phosphor layer is a blue phosphor layer. A method for controlling a flat display panel.
3. A method for controlling a plasma display panel, which combines a back substrate module including phosphor layers of different three colors and a front glass substrate module including display electrodes,
   Among the three-color phosphor layers, the characteristics of the display discharge frequency and discharge luminance of the two-color phosphor layers are substantially the same,
   A plasma display panel that controls the discharge luminance of the plasma display panel by controlling the number of display discharges of the phosphor layers other than the two-color phosphor layers out of the three-color phosphor layers. Control method.
4. 4. The method of controlling a plasma display panel according to claim 3, wherein the two-color phosphor layers are a red phosphor layer and a green phosphor layer, and the other phosphor layers are blue phosphor layers. A method for controlling a plasma display panel.
5. A control method of a plasma display panel according to claim 4, the fluorescent material of the red phosphor layer of the plasma display panel _{(Y, G d) PVO 4} : a E _u, the green phosphor layer material There _Z n2 _S i _O 4: a _{M n,} the blue phosphor material of the layer _{B a M g Al 10 O 17} : controlling method for a plasma display panel, which is a _{E u.}
6. 5. The method of controlling a plasma display panel according to claim 4, wherein the phosphor material of the red phosphor layer of the plasma display panel is (Y, G _d ) PVO ₄ : E _u and (Y, G _d ) BO ₃ : mixing weight ratio of the phosphor powder E _u 0.3: is obtained by mixing in 0.7, the material of the green phosphor layer, the material of the green phosphor layer is _{Z n2 S i O 4: M} n and _{(Y, G d) BO 3} : T b a weight mixing ratio of 0.4: is obtained by mixing in 0.6, the material of the blue phosphor layer _{B a M g Al 10 O 17} : in _{E u} A method for controlling a plasma display panel, comprising:
7. 5. The method of controlling a plasma display panel according to claim 4, wherein the phosphor material of the red phosphor layer of the plasma display panel is (Y, G _d ) PVO ₄ : E _u and (Y, G _d ) BO ₃ : mixing weight ratio of the phosphor powder E _u 0.5: is obtained by mixing in 0.5, the material of the green phosphor layer is _{Z n2 S i O 4: M} n and _(Y, G d) BO ₃ : _{T b} phosphor powder mixing ratio by weight of 0.5: is obtained by mixing in 0.5, the blue phosphor layer of material _{B a M g Al 10 O 17} : and characterized in that the _{E u} Control method for plasma display panel.
8. 5. The method of controlling a plasma display panel according to claim 4, wherein the phosphor material of the red phosphor layer of the plasma display panel is (Y, G _d ) PVO ₄ : E _u and (Y, G _d ) BO ₃ : mixing weight ratio of the phosphor powder E _u 0.75: is obtained by mixing in 0.75, the material of the green phosphor layer is _{Z n2 S i O 4: M} n and _(Y, G d) BO ₃ : the _{T b} 0.7: is obtained by mixing in 0.3, the blue phosphor layer of material _{B a M g Al 10 O 17} : controlling method for a plasma display panel, characterized in that the _{E u} .
9. 5. The method of controlling a plasma display panel according to claim 4, wherein the phosphor material of the red phosphor layer of the plasma display panel is (Y, G _d ) BO ₃ : _Eu , and the material of the green phosphor layer There _{Z n2 S i O 4: M} n and _{(Y, G d) BO 3} : T b 0.35: is obtained by mixing in 0.65, the material of the blue phosphor layer _B a _M g Al _A method for controlling a plasma display panel, which is ₁₀ O ₁₇ : _Eu .
10. A plasma display panel comprising a red phosphor layer, a green phosphor layer and a blue phosphor layer,
    The material of the red phosphor layer is a mixed material containing (Y, Gd) PVO4: Eu in a weight mixing ratio X (0.00 = <X = <1.00),
    The material of the green phosphor layer is a mixture containing ZnSiO4: Mn in a weight mixing ratio Y (0.00 = <Y = <1.00),
    The weight mixing ratio X and the weight mixing ratio Y are
    0.704X2-0.0568X + 0.25 ≤ Y ≤ 0.704X2-0.0568X + 0.45
    A plasma display panel characterized by satisfying the above relationship.
11. The plasma display panel according to claim 10, wherein
    A plasma display panel comprising a control unit for controlling the discharge luminance of the flat display panel by controlling the number of display discharges in the blue phosphor layer.

Images