JPS5814449A - Cathode-ray tube for color display - Google Patents

Abstract

PURPOSE:To obtain a cathode-ray tube which is used for a easily seen color display with a bright picture surface, without sacrificing the contrast effect, by forming the fluorescent screen of each emission color by mixing phosphors with different emission colors. CONSTITUTION:When a green color is desired to have a tint of yellow, use of a yellowish green phosphor doesn't work since the yellow color is cut by the absorption band of glass. However, if a fluorescent screen is prepared by mixing a red emitting phosphor into a green emitting phosphor, the effect of a face plate containing Nd2O3 and the like and having a wavelength selectivity is fully exhibited, and a desired color tone is obtained without sacrificing the contrast. As for a blue color, since a highly pure blue used for a display indicating letters and figures is difficult to be seen and tires the people who are looking at the display, a blue emitting phosphor is mixed with appropriate amounts of a green and a red phosphor so as to enable the blue color to have a whitish color tone and to obtain a display which can be much more easily seen. In addition, if a small amount of a green emitting phosphor is mixed into a highly pure red emitting phosphor, the emission color can be made close to orange color while maintaining the improving effect of the contrast.

Description

[Detailed description of the invention] This generator mainly displays characters and figures in multiple colors.
This is related to cathode ray tubes for color displays.In general, the glass used as the face plate of cathode ray tubes is a clear face with a light transmittance of tsyss or higher in the visible range, a dray face with a light transmittance of 40 to 7 seconds, and a 60 They are classified according to their degree of light transmittance, such as tinships that are below a whisper. For color cathode ray tubes, CFi,
Normally, even if the contrast is 1/1c, it is brighter than 7, so what is the dray face tt with good transmittance?
The rear face absorbs extraneous light.

1 is better because it increases the chondral stripe, uses 1 lcFi for taming, and 1 las for tint with low transmittance, but in general, the light output of a color cathode ray tube is such that sufficient light can be obtained even if the transmittance of the glass is lowered. Not "Clear 7 with high C1 transmittance
Enisma Kame uses Dareiface, Consilus, F
In order to raise the turtle, the platter 8 ma) For those who make it into the littutus form, gll is born and the song shown in the 11th - ym
a4 The normal clear face, dk 1m 1/m, is the spectral transmittance curve of the Daley face.
It can be seen that it has salty transmittance characteristics.

2 However, compared to a cathode ray tube such as an ordinary color television set (1cJ11), the actual area emitting light from a color display cathode tube for displaying letters or W shapes is %-11! Licking, contrast is important, and it is desirable to make the body color of the face surface as black as possible.
h, Therefore, by adding a small amount of rare earth elements such as neodymium (M・0 La1n theory) during the melting of the face plate in -fiWc, wavelength selectivity as shown by 11211 can be obtained in the spectral transmittance of 1 face plate. It has been proposed that Jin and TIIIL will have the same effect.

The characteristics of 111211 are the spectral transmittance of a glass with a neodymium-added Ll plate thickness of 10-1, which seems to contain about 1 weight of O in (Wagon) f)I. To,! 179～
585 Hoho and 51 (INS!
The edge, the wavelength range of the part corresponding to the valley rII of the luminescent speckle of the blue phosphor ('h. As a result, it transmits light in other wavelength ranges and absorbs light in other wavelength ranges.As a result, the chromaticity of primary colors such as dark green and blue is significantly increased without increasing the brightness. raise.

The aS diagram shows the chromaticity in ozm. 7 ace play) is the chromaticity of transmitted light when the fluorescent surface is S. On the other hand, since it has the Ll wavelength selectivity shown in Figure 112 above, the face plate and the above! In combination with the fluorescent surface of '22, the color of the transmitted light fFi1 is broken III as shown by the dot-dashed line 1.
Each la point of & also moves to a deeper chromaticity point, and the color reproduction range [is approximately 1s-1 Daikichi (Naruhachi, cone shirasu)%IINI]
I's? 40% compared to the rear glass, compared to the rear glass (
These characteristics are mainly due to the optical absorption band (dominant deviation) in the wavelength range of 570 to 58 seconds.

Lktll et al., cathode ray tubes for general color televisions and cathode ray tubes for monitors used in broadcasting stations, medical applications, industrial JI & etc. are desired to have good contrast and color purity; The color purity of cathode ray tubes for use in televisions is very high, and when displaying multiple colors at the same time, the screen looks different depending on the color, and the eyes tend to feel tired. A1 kanji will occur.

In order to improve the above-mentioned drawbacks of the T face plate by imparting wavelength selectivity to the light transmittance, this invention is rich in TI: 1, and mixes the luminescent color light body in order to emit fluorescent light of each luminescent color. The purpose of the present invention is to provide a cathode ray tube for a color display that is easy to view, without making the contrast effect uniform.

In the case of a face plate, for example, in order to make the purity of red a little closer to orange, it is necessary to have a light emission characteristic that is flat in the visible range like the conventional one. Color phosphor - If you use %lk...) Wavelength interpreter containing la, o, & etc! Irr face glass transmits most of the orange light at 1 kVh, so if you use a mixture of a high purity red light emitting phosphor and a small amount of green light emitting phosphor,
The goal is to maintain the contrast effect and bring the luminescent color closer to orange.

In addition, in the case where green v'3vi is similarly constructed with a yellowish color - the phosphor itself used is yellowish. However, if a fluorescent surface is made by mixing a green-emitting phosphor with a red-emitting phosphor, M&.

Since it contains Os, etc., the effect of 7 ace verate with wavelength selectivity is fully exhibited, and the desired color tone can be obtained without making the contrast uniform. , Roughly speaking, the same is true for blue, and M* quality v4fi is difficult to see on displays that display text and graphics ((, it is said that it is easy to get irritated. For this reason, an appropriate amount of green light is added to the blue light-emitting phosphor. By mixing red and red emitting phosphors, even if you use a wavelength-selective 7-ace plate, you can make white FT-Color II.The brightness itself will improve as well. An easy-to-read display is obtained.

As described above, the chromaticity and color reproduction range of the cathode ray tube for color display according to one embodiment of the invention are shown by the solid line a in OV4. Using a black phosphor of IA-red red-light surface color emitting phosphor 1, mix 19 # of green phosphors and mix 11 green phosphors,
The green fluorescent surface is a color-chromatic light emitting phosphor 1 mixed with a red light emitting phosphor A7, and the convergent fluorescent surface is a blue light emitting phosphor IK.
:g#l, red light emitting phosphor 5 and red light emitting phosphor α6
As mentioned above, the cathode striped tube for color displays of Jin's invention adds rare earth oxides such as 'ILsoa to impart wavelength selectivity to light transmittance. A face plate F made of glass is used, and the fluorescent surface of each luminescent color formed on the inner surface of the face plate is composed of a mixture of phosphors of different luminescent colors to achieve low color purity. Because of this, it has good contrast) and a bright, easy-to-see screen with an IA of 1%.

[Brief explanation of drawings]

Figure 11 is a characteristic diagram showing the spectral transmittance of the 7Ace plate of a conventional color anode ray tube, 1izai is a characteristic diagram showing the spectral transmittance of a face plate made of glass containing neodymium oxide, 1158! is a conventional color pole ray tube and 12
Development of a color cathode tube using a face plate having the characteristics of 11 and 6
A chromaticity diagram showing the iK range is shown. Solid line a: A color display cathode ray tube according to the present invention. Agent Makoto Kuzuno - (14th outside) No. 1l1 1 Foundation (nm) Fig. 2 Wavelength (nm) Fig. 3 Procedural amendment (voluntary) 4325 'Showa Era Mon/day 2, Title of invention: Cathode-wrapped tube for color display V 3. Person making the amendment 6. "Detailed Description of the Invention" column of the specification to be amended. 6. Contents of amendment ゛(1) The description is amended as follows.

Claims (1)

[Claims] (1) rIBci in y' knee x f L/-)
[i] In a negative m-ray tube VC for a color display 4 with a multicolor display without a fluorescent surface having an exposed luminescent color, the face plate contains a rare earth oxide having wavelength-selectivity in light transmittance. It is made of glass and has 14 fluorescent lights of each of the above luminescent colors.
For YK, the color purity of the emitted light is reduced due to the mixing of phosphors of the emitted color, and the cathode ray tube for color display.