JPH01195639A - Cathode-ray tube for projection - Google Patents

Abstract

PURPOSE:To allow high-intensity luminance and obtain good color reproduction by forming a color filter layer on the face of a faceplate. CONSTITUTION:A color filter layer is directly formed on the face of the faceplate of a cathode-ray tube for projection with a coloring material containing a pigment and photosensitive resin constituted of multifunctional acrylate monomer, an organic polymer binder and a photopolymerization initiator made of a trihalomethyl-s-triazine compound. The color filter layer 2 is formed on the inner surface of the faceplate 1, a transparent electrode layer 3 is formed on the color filter layer 2, a phosphor layer 4 is formed on the transparent electrode layer 3. High-intensity luminance is thereby attained, and good color reproduction is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a projection cathode ray tube used in video projectors and the like.

BACKGROUND OF THE INVENTION A projection display is a device that controls a light source using two-dimensional image information, magnifies it using an optical system and space, and displays an image on a projection screen. Projection optical systems for CRTs are broadly classified into refractive types using convergent lenses and anti-q-1 types using concave mirrors. In the case of a color projection display, image information of the three primary colors of red and blue are projected separately from three projection tubes, and the images are displayed by superimposing them on the projection screen. At this time, in order to maintain sufficient brightness on the projection screen, the brightness of the projection tube had to be much higher than that of a normal CRT. As a result, the temperature at the phosphor screen became high.

FIG. 2 shows a schematic diagram of a conventional projection cathode ray tube.

A transparent electrode 12 is formed on the inner surface of the facebrake 11, and a phosphor layer 13 is formed thereon.

The brightness on the phosphor layer 13 is determined by the following equation.

B = −Ea ・I a/A B: Luminance E of the phosphor screen
a Near-node voltage ■a: Beam current A: Effective area Currently, brightness is increased by increasing the anode voltage. Since there is a limit to the number of phosphors that can be used under these conditions, clear white color cannot be reproduced by superimposing the three primary colors.

Problems to be Solved by the Invention There has been a problem in that the luminous efficiency decreases due to an increase in the temperature of the phosphor screen as the brightness increases, and color reproducibility deteriorates as a result.

Means for Solving the Problems The technical means of the present invention for solving the above problems are as follows:
A projection cathode ray tube is produced using a coloring material containing a photosensitive resin and a pigment, which are composed of a photopolymerization initiator consisting of a polyfunctional acrylate monomer, an organic polymer binder, and a trihalomethyl-5-) riazine compound. A color filter layer is directly formed on the face plate surface of the camera.

action The effect of this technical means is as follows.

The colored resist used in the present invention has excellent heat resistance and light resistance, so it can be used even under high brightness conditions.

Therefore, by combining it with a phosphor capable of emitting high-intensity light, a projection cathode ray tube with good color reproduction can be obtained.

Example An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view of a cathode ray tube for projection according to the present invention.

A color filter layer 2 is formed on the inner surface of the face plate 1, a transparent electrode layer 3 is formed on the color filter N2, and a phosphor Pi4 is formed on the transparent electrode JW3. As for the phosphor, there are two methods: one method uses a white phosphor and separates the colors using a color filter, and the other uses a color emitting phosphor and increases color purity using a color filter.

When emitting three primary colors using one cathode ray tube, the following configuration can be considered as the configuration of the color filter N2 and the phosphor layer 4.

A color filter layer can also be formed on the outer surface of the faceplate.

Next, an example of the material of the color filter used in the present invention will be shown. Photosensitive resins include polyfunctional acrylate monomers such as ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, 1,6-hexanediol diacrylate, pentaerythritol diacrylate, and pentaerythritol triacrylate, as well as heat resistance and resistance. The basic composition consists of an organic polymer binder and a photopolymerization initiator consisting of a trihalomethyl-S-triazine compound to impart chemical properties such as drug properties and mechanical properties such as surface hardness and volumetric shrinkage.

As the organic polymer binder, a copolymer with monomers of unsaturated organic acid compounds such as acrylic acid and methacrylic acid that are compatible with acrylate monomers and organic acid esters having a vinyl group such as methyl acrylate, ethyl methacrylate, and benzyl methacrylate can be used. Examples include polymers. Having an acidic group such as a carboxyl group enables water-soluble development, which is more economical and safer than organic solvent development. As photopolymerization initiators for trihalomethyl-5-)riazine compounds, 2-phenyl-4,6-bis(trichloromethyl)-S-)riazine, 2-(p-chlorophenyl)-4,6-bis( trichloromethyl)-s-)
Riazine, 2-(p-lyl)-4,6-bis-(trichloromethyl)-s-triazine, 2-(p-methoxyphenyl)-4,6-bis-(trichloromethyl)
-s-) riazine, 2-(2',4'-dichlorophenyl)-4,6-bis-(trichloromethyl)-S-) riazine, and the like.

As the red pigment, anthraquinone pigments and perylene pigments may be used alone, or a mixture thereof, or a mixture with a disazo yellow pigment or an isoindoline yellow pigment may be used. For example, as an anthraquinone pigment, C0
1, Pigment Red 177, perylene pigments include C01, Pigment Red 155, and in terms of color reproducibility, C01, Pigment Yellow-83 or C2
1. Mixing with Pigment Yellow-139 was good.

As the green pigment, a halogenated phthalocinine pigment alone or a mixture with a disazo yellow pigment or an isoindoline yellow pigment is used, such as C01, Pigment Gerinph, 36.37 and c, 1. Mixing with Pigment Yellow 83 or C91 and Pigment Yellow-139 was good.

As the blue pigment, a phthalocyanine pigment alone or a mixture with a dioxazine purple pigment is used, such as C81.
, Pigment Blue 15:3 was mixed well with C61 and Pigment Violet 23.

Furthermore, the above pigments are mixed with acrylic resin, maleic acid resin,
A pigment-containing photosensitive resin with good dispersibility and dispersion stability was obtained by using a powdered processed pigment finely dispersed in either a chlorinated vinyl vinegar picopolymer or an ethyl cellulose resin. In particular, processed pigments using acrylic resin and ethyl cellulose resin were optimal in terms of transparency and dispersion stability.

In addition, the pigment particle system has visible light wavelengths (400 nm to 700 nm).
Even more preferably, the average particle diameter is smaller than I/nm).
Sample No. 2 had better light transmittance.

In this example, a color filter was created using the pigment-dispersed photosensitive resin of the present invention shown below.

Red photosensitive resin product name: Color Mosaic Red (CM-R) (manufactured by Fuji Hunt Tech Co., Ltd.) Green photosensitive resin product name: Color Mosaic Green (CM-G) (Fuji Hashitorku Co., Ltd.) (Manufactured by Tronix Technology Co., Ltd.) Blue photosensitive resin Product name: Color Mosaic Blue (CM-B') (Fuji Hunt Co., Ltd.) (Manufactured by Tronix Technology Co., Ltd.) Effects of the Invention As described above, according to the present invention, It is possible to provide a projection cathode ray tube that can emit high-intensity light and has good brown color reproduction. Furthermore, when the cathode ray tube for projection of the present invention is used in a video projector, the color filters conventionally required in optical systems become unnecessary, so that the optical system can be made more compact.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional configuration diagram of a projection elbow cathode ray tube according to an embodiment of the present invention, and FIG. 2 is a cross-sectional configuration diagram of a conventional example. ...Transparent electrode layer, 4...phosphor layer.

Claims (3)

[Claims] (1) A projection cathode ray tube characterized in that a color filter layer is formed on the face plate surface. (2) The projection cathode ray tube according to claim 1, wherein a color filter layer is formed on the inner surface of the face plate, and a phosphor is formed on the color filter layer. (3) The color filter material is a coloring material containing a pigment and a photosensitive resin whose composition is a photopolymerization initiator consisting of a polyfunctional acrylate monomer, an organic polymer binder, and a trihalomethyl-s-triazine compound. The projection cathode ray tube according to claim 1 or 2, characterized in that: