JPH087800A - CRT for projector - Google Patents

Abstract

(57) [Abstract] [Purpose] To expand the color reproduction range while keeping the CRT brightness high. [Constitution] A phosphor 14 containing a pigment is applied to the inner surface of a glass panel 13 of a CRT 1. In this example, pigments of the same color are applied to the red phosphor 14 and the green phosphor 14, respectively. As a result, for example, in the green phosphor 14, the main wavelength of 546 nm remains the same and the other wavelengths are suppressed to emit light, so that the luminance level is high and the color purity is improved. The same applies to the red phosphor. This gives C
The brightness of RT1 is kept high and the color reproduction range is expanded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector CRT capable of improving color purity and expanding a color reproduction range.

[0002]

2. Description of the Related Art In an image projector, since an image displayed on the panel glass of a projector CRT is projected onto a screen by a projection lens, the fluorescent substance applied to the panel glass of the projector CRT is high. Brightness is required. However, it is generally required that luminous efficiency be high, and a phosphor that can obtain high brightness has poor color purity. For example, as shown in FIG.
In the emission spectrum of the green phosphor used for RT, in addition to the dominant wavelength near 546 nm, 480 nm, 58
There are sidebands with relatively high emission luminance near 0 nm and 625 nm, which causes deterioration of color purity.

In order to improve the color purity of such a projector CRT, the following four methods have hitherto been mainly performed. That is, there are four methods: coloring the projection lens, coloring the liquid cooling liquid, arranging a color filter in front of the phosphor, and coloring the panel glass of the CRT. Among these methods, the method of coloring the projection lens is to color the projection lens without coloring the CRT phosphor in all three primary colors. The method of coloring the liquid cooling liquid is to color the liquid cooling liquid instead of the projection lens. The liquid cooling liquid is a liquid placed outside the panel glass to prevent the panel glass, etc. from being heated by the high temperature because the phosphor has high brightness, and a liquid mixture of ethylene glycol and glycerin or water is used. Has been.

Further, the method of arranging the filter in front of the phosphor is to arrange a coloring filter between the phosphor which is not colored and the panel glass, and the method of coloring the panel glass of the CRT is the phosphor. The panel glass is colored without coloring.

[0005]

Among the above-mentioned four methods, in the method of coloring the projection lens and the method of coloring the liquid cooling liquid, since the color of the phosphor itself (not the emission color) is white, there are three primary colors. However, there is a problem that it becomes difficult to distinguish CRTs from each other, and management man-hours increase. Further, the method of arranging the color filter in front of the phosphor has a problem that the manufacturing process of the phosphor screen becomes complicated as described below, resulting in an increase in cost.

FIG. 4 shows a procedure of, for example, a slurry type phosphor screen forming process 20 used in a method of disposing a color filter in front of a phosphor. Here, the acceptance inspection of the glass panel is first performed (step 21), and then CR
HV carbon is applied to provide a high voltage path at T (step 22). Next, HV carbon is fired, and then washed and dried (steps 23 and 24). Subsequently, a slurry for filters is injected and dried (step 25, step 2).
6). Next, the phosphor slurry is injected, and thereafter, exposure and development are performed (step 27 to step 29).
Next, polyvinyl alcohol (PVA) and lacquer are applied and dried (steps 30 to 32). Subsequently, a metal back process is performed (step 33), and this phosphor screen forming process 20 ends. As described above, when the phosphor screen has a two-layer structure of a filter and a phosphor, in the phosphor screen forming process 20, it is necessary to perform the slurry injection for the filter and the phosphor slurry injection, which increases the number of steps. .

Therefore, the present invention solves the above-mentioned problems, and proposes a projector CRT capable of improving color purity, widening a color reproduction range, and further reducing costs. It is a thing.

[0008]

In order to solve the above-mentioned problems, according to the present invention, in a projector CRT in which phosphors of three primary colors of red, green and blue are applied to a panel glass, any one of the phosphors is used. It is characterized in that a pigment of the same color as the phosphor is mixed in.

[0009]

As shown in FIG. 1, the glass panel 1 of the CRT 1
A phosphor 14 containing a pigment is applied to the inner surface side of 3.
In this example, the red phosphor 14 and the green phosphor 14 are coated with pigments of the same color. As a result, for example, in the green phosphor 14, as shown in FIG.
Since 6 nm remains as it is and light is emitted while suppressing other wavelengths, the luminance level is high and the color purity is improved. The same applies to the red phosphor 14. As a result, the brightness of the CRT 1 is high and the color reproduction range is expanded.

[0010]

EXAMPLE Next, a projector CRT according to the present invention
An embodiment will be described in detail with reference to the drawings.

FIG. 1 shows a C for a projector according to the present invention.
The structure of RT1 is shown. Similar to a normal CRT, this CRT 1 has an electron gun 12 arranged on the base side of a funnel-shaped funnel 11 and a glass panel 13 arranged on the opposite side of the electron gun 12. On the inner surface side of the glass panel 13, a pigment-containing phosphor 14 is applied. In this example, the red phosphor 14 and the green phosphor 14 are mixed with the same color as each phosphor, that is, a red pigment or a green pigment. As the blue phosphor 14, a standard one is used, and since the color purity is not deteriorated, it is not necessary to add a pigment.

FIG. 2 shows the emission spectrum of the green phosphor 14 and the spectral transmittance of the green pigment as an example. As can be seen from the figure, the green pigment easily transmits the wavelength around the main wavelength of 546 nm and hardly transmits the other wavelengths. Therefore, when the phosphor 14 is irradiated with the electron beam, the main wavelength remains unchanged and the sideband is suppressed to emit light, so that the brightness is maintained as it is and the color purity is improved.

Further, in this CRT 1, since the phosphor slurry containing a pigment is simply injected in the phosphor screen forming process, the conventional phosphor forming process 2 shown in FIG. 3 is performed.
It is possible to reduce the number of steps as compared with 0, and it is possible to reduce the cost.

[0014]

As described above, according to the present invention, in the projector CRT in which the phosphors of the three primary colors of red, green and blue are applied to the panel glass, any one of the phosphors has the same color as the phosphor. Is mixed in.

Therefore, according to the present invention, it is possible to improve the color purity and expand the color reproduction range while maintaining the brightness of the phosphor of the projector CRT at a high level. In addition, the number of steps for forming the phosphor screen is reduced, so that the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a projector CRT 1 according to the present invention.

FIG. 2 is a diagram showing an emission spectrum of a green phosphor and a spectral transmittance of a green pigment.

FIG. 3 is a diagram showing an emission spectrum of a green phosphor.

FIG. 4 is a diagram showing a procedure of conventional phosphor screen formation processing 20.

[Explanation of symbols]

 1 CRT for projector 11 Funnel 12 Electron gun 13 Glass panel 14 Phosphor with pigment

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tatsumi Saito 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Tsuneharu Nomura 6-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation

Claims (2)

[Claims] 1. A CRT for a projector in which phosphors of three primary colors of red, green and blue are applied to a panel glass, wherein a pigment of the same color as the phosphor is mixed in any of the phosphors. Characteristic projector CRT. 2. The CRT for a projector according to claim 1, wherein the pigment is mixed in the red and green phosphors.