JP2004109545A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device, such as a plasma display, which reduces the influence to be exerted on the display by coloration of a glass substrate. <P>SOLUTION: The display device formed by using a front plate formed with silver electrodes on the glass substrate formed by a floating method is arranged with a color correction filter 22 having light transmission characteristics making an additive complementary color relation with the spectral characteristics of the reflected light of the display surface on the display surface side of the front plate 1 of a PDP (Plasma Display Panel) panel 21. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a display device such as a plasma display.
[0002]
[Prior art]
2. Description of the Related Art In recent years, a display device using a plasma display panel (PDP) has attracted attention as a display panel (thin display device) having excellent visibility, and higher definition and a larger screen are being promoted.
[0003]
This PDP is roughly classified into two types: an AC type and a DC type in terms of driving, and there are two types of discharge types, a surface discharge type and a counter discharge type. At present, PDPs of the AC type and the surface discharge type have become the mainstream.
[0004]
FIG. 7 shows an example of a panel structure in a PDP. As shown in FIG. 7, on a transparent front plate 1 such as a glass substrate, a plurality of pairs of display electrodes 4 formed by scanning electrodes 2 and sustain electrodes 3 are formed. A light-shielding layer 5 is disposed between the electrodes 4. The scanning electrode 2 and the sustaining electrode 3 are respectively composed of transparent electrodes 2a, 3a and silver electrodes 2b, 3b electrically connected to the transparent electrodes 2a, 3a. In addition, a dielectric layer 6 is formed on the front plate 1 so as to cover the plurality of pairs of electrodes, and a protective film 7 is formed on the dielectric layer 6.
[0005]
A plurality of data electrodes 10 covered with an insulator layer 9 are formed on a rear plate 8 opposed to the front plate 1 in a direction perpendicular to the display electrodes 4 of the scan electrodes 2 and the sustain electrodes 3. Have been. A plurality of barrier ribs 11 are arranged on the insulator layer 9 between the data electrodes 10, and a phosphor layer 12 is provided on the side surface 11 a between the barrier ribs 11 and the surface of the insulator layer 9.
[0006]
The front plate 1 and the back plate 8 are opposed to each other with a minute discharge space interposed therebetween so that the scan electrode 2 and the sustain electrode 3 are orthogonal to the data electrode 10, and the periphery thereof is sealed. In the discharge space, one of helium, neon, argon, and xenon or a mixed gas is sealed as a discharge gas. The discharge space is divided into a plurality of sections by the partition walls 11, so that a plurality of discharge cells 13 where the intersections of the display electrodes 4 and the data electrodes 10 are located are provided. The phosphor layers 12 are sequentially arranged for each color so as to be blue.
[0007]
As shown in FIG. 8, the electrode arrangement of the panel body has a matrix configuration including M rows × N columns of discharge cells, and M rows of scan electrodes SCN1 to SCNM and sustain electrodes SUS1 to SUSM are arranged in the row direction. The data electrodes D1 to DN of N columns are arranged in the column direction (for example, see Patent Document 1).
[0008]
[Patent Document 1]
JP 2000-164145 A
[Problems to be solved by the invention]
In this PDP, there are a PDP using a glass substrate formed by a float method on the front panel 1 and a PDP using a non-float glass substrate. In addition, a method for forming an electrode from a silver material is often used in terms of cost advantage and the like.
[0010]
By the way, it is well known that when an electrode made of a silver material is formed on a glass substrate formed by a float method and then heat-treated, the entire surface of the substrate shows yellow or brown discoloration. When this discoloration occurs on the substrate used on the display surface side of the display device, the reflected light looks yellow or brown when viewed from the display surface side, and the displayed image has a weak blue color. There were problems such as poor display.
[0011]
In particular, in PDP, a silver electrode is used as an electrode on a glass substrate formed by a float method, and a high-temperature treatment of 500 ° C. or more is performed as a substrate heat treatment. There have been problems such as the screen color and the screen tint when not lit are not natural.
[0012]
The present invention has been made in view of such a problem, and has as its object to reduce the influence on the display due to coloring of a glass substrate.
[0013]
[Means for Solving the Problems]
In order to solve this problem, in the display device of the present invention, a color correction filter having a light transmission characteristic having a complementary color relationship to a spectral characteristic of reflected light on the display surface is disposed on the display surface side of the front plate. is there.
[0014]
With this configuration, the color of the lit display screen and the screen tint at the time of non-lighting can be made natural and a higher quality image can be obtained.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
That is, the invention according to claim 1 of the present invention is a display device using a front plate having silver electrodes formed on a glass substrate formed by a float method on a display surface side, wherein the display surface of the front plate is A color correction filter having a light transmission characteristic having a complementary color relationship to the spectral characteristic of the reflected light on the display surface is arranged on the side.
[0016]
According to a second aspect of the present invention, in the first aspect, the color correction filter has a characteristic that the light transmittance in at least one of the green light and the red light is lower than the light transmittance in the blue light region. It uses what it has.
[0017]
According to a third aspect of the present invention, in the first or second aspect, a color correction filter that mainly absorbs light having a wavelength of about 595 nm and reduces light transmittance in a red light region is used. .
[0018]
Hereinafter, a display device using a PDP according to an embodiment of the present invention will be described with reference to FIGS.
[0019]
(Embodiment 1)
FIG. 1 shows a display device using a PDP according to a first embodiment of the present invention. In FIG. 1, reference numeral 21 denotes a PDP panel shown in FIG. The color correction filters 22 are arranged at intervals of about 5 mm. Further, the PDP panel 21 is housed in a case 23 which is an ambient light blocking member so that ambient light does not enter between the PDP panel 21 and the color correction filter 22.
[0020]
Next, the color correction filter 22 will be described.
[0021]
A curve a in FIG. 2 indicates that a PDP panel 21 was formed using a front plate formed by baking an electrode pattern using a silver paste on a glass substrate formed by a float method with a transparent electrode, and the surface of the PDP panel 21 was formed. It is the reflected light spectral spectrum distribution which measured the reflected light with the colorimeter from the side. As is apparent from FIG. 2, in the substrate of the PDP panel 21, the reflection in the blue portion is low, and the reflected light in green and red tends to be relatively high. When the panel was viewed under white light illumination, it was apparently yellow to brown in color.
[0022]
As shown in the transmitted light distribution of FIG. 3, on the display surface side of the PDP panel 21, a film-shaped color correction filter having a relatively high transmitted light spectral distribution of blue, which has a complementary color relationship with the substrate reflected light of yellow to brown. When the panel 22 was arranged and the panel was used to measure reflected light with a colorimeter, a reflected light spectrum distribution as shown by a curve b in FIG. 2 was obtained. Due to the effect of the filter, the reflected light is substantially uniform over the entire visible spectrum.
[0023]
When the PDP panel 21 on which the film-shaped color correction filter 22 was disposed was viewed under white light, it appeared neutral gray (natural gray), and did not appear as unnatural reflected light having a biased color.
[0024]
(Embodiment 2)
On the display surface side of the PDP panel 21 showing the yellow to brown reflected light of the first embodiment, a film having a deep absorption near the wavelength of 595 nm as shown in FIG. A color correction filter 22 having a rectangular shape is arranged. In addition, the color tone of this color correction filter alone appears blue, and has a complementary color relationship with light reflected from the front panel of the PDP panel from yellow to brown.
[0025]
When the PDP panel on which the film-shaped color correction filter of the second embodiment was arranged was viewed under white light, it appeared neutral gray (natural gray) and did not look like unnatural reflected light with a biased color.
[0026]
The color points when the PDP panel 21 on which the color correction filter according to the second embodiment is arranged are lit in a single color are as shown by the blue circle c in FIG. 5 and the red circle e in FIG. As a result, the color purity of red and blue was improved compared to the color point of the PDP panel without a filter (d in FIG. 5, f in FIG. 6).
[0027]
As is clear from the above description, even if the front panel has yellow or brown discoloration (coloring), the color of the lit display screen or the screen tint when the front panel is not lit is made a natural tint, and a higher quality image is obtained. Is what you can do.
[0028]
In the above embodiment, only the effect of the PDP panel is shown. However, other than the PDP, any display device which requires a heat treatment with a structure in which a glass substrate is used as a front plate by a float method and silver electrodes are formed. The same effect can be obtained. In addition to the configuration in which the color correction filters are arranged at intervals on the panel as shown in FIG. 1, the configuration may be such that the color correction filters are directly attached to the front panel of the panel.
[0029]
【The invention's effect】
As is apparent from the above description, according to the present invention, the problem that the color of the lit display screen or the screen tint at the time of non-lighting is not natural due to the discoloration (coloring) of the substrate in yellow or brown is solved, The color and the screen tint at the time of non-lighting can be made a natural tint, and a higher quality image can be obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a schematic configuration of a display device using a PDP panel according to an embodiment of the present invention. FIG. 2 shows a display device of the present invention in which a color correction filter is arranged and a display device without a color correction filter. FIG. 3 is a diagram showing a comparison between spectral reflection spectra. FIG. 3 is a diagram showing a spectral transmission spectrum of a color correction filter according to one embodiment of the present invention. FIG. 4 is a spectral transmission spectrum of a color correction filter according to another embodiment of the present invention. FIG. 5 is a diagram showing a spectrum. FIG. 5 is a diagram showing a blue color point of a display device of the present invention in which a color correction filter is arranged and a display device without a color correction filter. FIG. 6 is a diagram showing a display device of the present invention in which a color correction filter is arranged. FIG. 7 shows a red color point of a display device without a color correction filter. FIG. 7 is a perspective view showing an example of a plasma display panel. FIG. 8 is an electric wiring diagram of the panel. Description of the issue]
1 front panel 21 PDP panel 22 color correction filter

Claims (3)

A display device using a front plate having silver electrodes formed on a glass substrate formed by a float method on a display surface side. A display device, comprising a color correction filter having a light transmission characteristic having a complementary color relationship. The display device according to claim 1, wherein the color correction filter has a characteristic that light transmittance in at least one of green light and red light is lower than light transmittance in a blue light region. The display device according to claim 1, wherein the color correction filter mainly absorbs light near a wavelength of 595 nm to reduce light transmittance in a red light region.

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