JPS6034780B2 - cathode ray tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel television cathode ray tube, more specifically, a novel television cathode ray tube having one electron gun and a halo film for displaying chromatic colors using black and white television signals. It is related to.

Conventionally, there are two main types of television reception systems: black-and-white and color; black-and-white television cathode-ray tubes are used for black-and-white, and color television cathode-ray tubes are used for color.

The former has one electron gun and a crab light film that displays images by changing the brightness of an achromatic color, while the latter has three or one electron gun.
The electron gun emits light in the three primary colors of red, green, and blue, and has dot-like or stripe-like crab light ridges that change in brightness depending on the intensity (current density) of the electron beam, giving a natural-color light-emitting display as a whole. The electron gun is controlled by a black-and-white television signal and a color television signal, respectively, to display a black-and-white image or a color image. Since black-and-white televisions that display images by changing the brightness of achromatic colors produce very monotonous and uninteresting images, color televisions that emit light in natural colors are now widely used.

However, color television requires complex methods for photographing, transmitting, and receiving, and is expensive, so there are many regions where black-and-white televisions are used exclusively due to equipment constraints and economic conditions.

Furthermore, due to similar constraints and conditions, there are many fields in which black and white televisions are exclusively used depending on the purpose. Therefore, the equipment cost is relatively low like black and white television,
Moreover, although there is a desire for a television system that solves the monotony of images in black-and-white television, there is currently no system that meets such demands.

Although it is possible to display chromatic television images at low cost by using the traditional black and white television system as is, this does not solve the monotony of the images. That is,
By changing the mixing ratio of the blue-emitting crab-light film and the yellow-emitting crab-light film that make up the crab-light film of a cathode ray tube, a blue (blue-white) or yellow (yellow-white) light-emitting crab film can be produced. So-called monochrome image display can be achieved by changing the brightness. However, the halo material used in the conventional crab light film is Zn.
A blue light-emitting crab light material whose brightness increases linearly with an increase in current density, such as an S:Ag photochromic material, that is, a blue light-emitting crab light material which has a linear electron density-luminance characteristic, and (
Zn,Cd)S:Ag halo, (Zn,Cd)S:Cu
, AI crab light, etc., which also have a linear current density-luminance characteristic. The light emission brightness of the crab light film is controlled by controlling the beam current in response to the black and white television signals from the dark level signal (0 signal) to the highlight signal, and an image is displayed by the change in brightness. Therefore, since the colors do not change in response to changes in the beam current, not only is the monotony of the image not improved at all, but also the range of brightness changes in chromatic colors is narrower than in achromatic colors. This results in a display with lower contrast than image display based on brightness changes. Since the human eye is more sensitive to changes in color than to changes in brightness of achromatic colors, ie, changes in black and white, the monotony of this image can be improved by converting black and white changes into changes in color.

The applicant has conducted research based on this idea, and found that even if the signals of the conventional black and white television system are used as they are,
If the highlight signal is displayed in white, and the signal between the highlight signal and the dark level signal is displayed in a chromatic color whose color changes continuously depending on the brightness, the monotony of the image seen in black and white television systems can be improved. It has been discovered that it is possible to obtain images with completely new tones that have never been seen before, and which can fully satisfy the color emotions of the viewer.

The present invention provides a crab light film useful in this new way of thinking, that is, a highlight signal is displayed in white when irradiated with an electron beam corresponding to a conventional black and white television signal,
It is an object of the present invention to provide a cathode ray tube having a crab light film that displays a signal intermediate between a highlight signal and a dark level signal in chromatic colors that change continuously depending on the brightness.

As described above, the cathode ray tube of the present invention uses black and white television signals as they are, so conventional black and white television equipment can be used as they are. Since it is displayed in white, it is possible to obtain images with new, interesting color tones at low cost. Its value is enormous. Furthermore, as is well known, in color television (NTSC system), a luminance signal (Y signal) and a color signal (1
, Q signal) to record and reproduce images, and this luminance signal (Y signal) corresponds to the luminance signal of a conventional black and white television (for example, Ohm's "Electronic Engineering Pocket Book"). In the present invention, this luminance signal can also be used as the above-mentioned black-and-white television signal.

Therefore, in the system using the cathode ray tube of the present invention, conventional color television equipment can be used as is. Note that in this specification, the luminance signal in color television is also referred to as a "monochrome television signal." Hereinafter, the structure and operation of the cathode ray tube of the present invention will be explained in detail.

The structure of the cathode ray tube of the present invention is exactly the same as that of a conventional black and white television cathode ray tube, except for the crab light film, as shown in FIG.

That is, the cathode ray tube of the present invention has one electron gun 3 in the neck portion 2 of the funnel 1, and a crab light film 5 is formed on the entire surface of the face plate 4 facing the electron gun 3.
In the cathode ray tube configured in this way, the crab light film is made of a mixture of two or more kinds of light bodies, and at least one of them is a mixture of two or more kinds of light bodies.
The type has a non-linear current density-luminance characteristic, and the emission color of the crab light film corresponds to the beam current.
It is characterized by a continuous change in color including white color. In addition, the code 6 is fired from the electron gun 2,
The electron beam irradiated onto the optical film 5 is shown. non-linear (
The non-linear current density-luminance characteristic means that the linearity of luminance is lost as the current density increases, and the crab light body with this non-linear current density-luminance characteristic can be classified into sublinear type and superlinear type. are categorized.

A sublinear halo is one in which the brightness deviates from a straight line and goes downwards as the current density increases (the slope of the increase in brightness becomes smaller), whereas a superlinear halo is the opposite where the brightness goes upward (the slope of the increase in brightness becomes smaller). The slope becomes larger). The emitted light color of the mixed halo is determined by the luminescent color and amount (brightness) of each component halo, and at least one type of halo having the above-mentioned non-linear current density-brightness characteristics is used. The crab light film of the cathode ray tube of the present invention is composed of a mixed crab light substance containing:
Since the brightness ratio of each light body that makes up the halo film changes continuously in response to changes in the beam current, the color of the emitted light changes continuously in response to changes in the beam current. let As described above, at least one of the crab light films of the cathode ray tube of the present invention has nonlinear current density-brightness characteristics.
It consists of a mixed halo obtained by mixing more than one type of aureole, and its emitted light color changes continuously in response to changes in beam current. Another important characteristic is that white is included among the emitted light colors that change continuously in response to changes in beam current.

As mentioned earlier, in a new image display method that uses black-and-white television signals to change color along with brightness, the highlight signal is displayed in white, so it changes continuously in response to changes in beam current. A stem light film that does not include white in the luminescent color that changes over time cannot be used as the crab light film of the cathode ray tube of the present invention. The above-mentioned white color refers to the area indicated by diagonal lines in the chromaticity coordinates of the CR color system in Figure 2, that is, C
It refers to white in the IE color system. Basically, at least one of the mixed phosphors used in the phosphor film of the cathode ray tube of the present invention has a non-linear current density-surprise characteristic, and connects the emission chromaticity points of each Cm display system. A straight line can be obtained by mixing appropriate amounts of two types of phosphors such that the line passes through the white region indicated by diagonal lines in FIG.

Figures 3A to 3C schematically show the current density-brightness characteristics of each crab light body in the crab light film of the cathode ray tube of the present invention using a mixed crab light body formed by mixing two types of crab light bodies. Fig. 3A shows a case where the two types of crab light body are sublinear type crab light body A and a near type crab light body B, and Figure 3B shows a case where the two types of halo bodies are linear type crab light body A and a linear type crab light body A. and super linear crab light body B
In this case, FIG. 3C shows a case where the two types of crab light bodies are a suplinia type halo body A and a superlinear type crab light body B. In the crab light film of the cathode ray tube of the present invention shown in FIGS. 3A to 3C,
In the region below the current density of 1 cherry blossom, the brightness of halo A is superior to that of crab phosphene B, so in this region, the color of the light emitted by the crab rays is always the same as that of crab phosphene A. This results in a dominant color mixture. On the other hand, in the region where the current density is higher than that, the amount of light emitted by crab photon B becomes higher than that of crab photon A, so in this region, the emission color of the crab photon film is always the same as that of crab photon B. The emitted light becomes a predominant striped color. Therefore, the emitted light color of the crab photon film changes continuously in response to an increase in current density from a warm color in which the emitted light color of the crab photon A is predominant to a faded color in which the emitted light color of the crab photon B is predominant. Describing this change in luminescent color using the CIE color system, the luminescent color corresponds to the increase in current density, and the luminescent chromaticity point of crab luminous body A is on the straight line connecting the luminous chromaticity points of both crab luminous bodies. It will continuously move from the vicinity toward the emission chromaticity point of the fin photon B towards Wanxi. Now the current density is 1. In other words, the current density is 1.0 to 12.
The crab light body A is adjusted so that the emission chromaticity point of the crab light film in the CIE color system is within the white area shown by diagonal lines in FIG.
and B, and the highlight signal is 1 to 12.
When a black and white television signal is converted to an electron beam so that an appropriate current density value within the range of It is displayed in a chromatic color that changes continuously from white to the light emission chromaticity point of the crab light body A in all directions on a straight line connecting the light emission chromaticity points of the halo body B, which is the object of the present invention. A new image display method is realized. In addition, when mixing the crab phosphors A and B, it is preferable to mix them in such a ratio that the resulting mixed crab phosphor emits white light at high current density.

This means that when both are mixed to exhibit white light emission at low and medium current densities, not only will the width of chromatic color change in each signal between the highlight signal and the dark level signal become narrower, but also the width of the chromatic color change in each signal between the highlight signal and the dark level signal will become narrower. This is because the display screen becomes dark. Furthermore, as a combination of the current density-brightness characteristics of the crab light bodies A and B, if one is a superlinear type crab light body and the other is a sublinear type light body, as shown in Fig. 3C, both of the current density and brightness characteristics will be satisfied within a certain current density range. Since the brightness ratio range of the light body can be made wider, it is possible to obtain a crab light film with a wide range of color changes. In the above, the crab light film of the cathode ray tube of the present invention has been described using a mixed crab light film formed by mixing two types of crab light bodies, but the crab light film used in the present invention is not limited to this. At least one type of light body is composed of a crab light body that has non-linear current density-luminance characteristics, and its luminescent color changes in response to changes in beam current.
If it contains the white color of the color system and changes continuously,
It goes without saying that a mixed crab photon formed by mixing three or more types of crab photons may also be used. The crab phosphor having non-linear current density-luminance characteristics, which is a component of the mixed crab phosphor used in the crab phosphor film of the cathode ray tube of the present invention, is Zn2Si0.
2: Mn crab photon, (Mg, Zn) 0. Ga203:Mn
Crab photon, K20/Ga203:Mn crab photon, NaTa0
3: Th crab light body (green light emitting sublinear type), (Z
n, Cd) S: Ag, Ni crab light, Y203:: Eu halo, Y202S: Eu crab light (red light emitting super linear type), (Zn, Cd) S: Ag, Ni crab light body(
Green-emitting super linear type), (Zn, Cd)3(P
04) 2:Mn crab photon, CaGa407:Mn crab photon (
The above-mentioned red light emitting sublinear type) and the like can be mentioned.

As is clear from the above, most of the currently known crab phosphors having non-linear current density-luminance characteristics emit green or red light. As mentioned earlier, when a superlinear type crab light body and a sublinear type halo body are combined, a wider range of color change can be obtained within a certain current density range. Considering this combination of red light-emitting type luminous bodies, there are two possibilities as follows. (Zn, Cd) S: Ag, Ni crab photon Y203:: Eu crab photon Y202S: Eu crab photon (Zn, Cd) 3 (P04) 2: Mn crab photon CaGa4
07: In a cathode ray tube using the Mn crab light body combination {1) mixed crab light body as a crab light film, the highlight signal becomes white, and each signal from the highlight signal to the dark level signal changes continuously. In the cathode ray tube of the present invention, in which the mixed crab light material of combination (2) is used as a crab light film, the highlight signal is displayed in white, and each signal from the highlight signal to the dark level signal is displayed in a continuous manner. It is clear from the above description that the image is displayed in a red-based chromatic color that changes.

Note that the luminous color of the pot light body changes depending on the amount of activator, the composition ratio of the matrix, etc., and when forming the crab light film with the above combination,
The continuously changing emission color may not include white.
In such a case, for example, by mixing an appropriate amount of a blue-emitting crab photoreceptor such as a ZnS:Ag photoreceptor, the emitted light color of the green-emitting crab photoreceptor is shifted to the shorter wavelength side, and continuously changing light emission is produced. It is sufficient that white is included in the colors. Next, the Mn activation amount is 3 x 10-3 g atoms per lmol of the base material (M soft.
7Z~. 3) 0. Ga203: Mn photophores and Ag and N activation amounts are 5 x 10 and 8 per gram of matrix, respectively.
The present invention will be specifically explained by taking as an example a cathode ray tube in which a crab light film is made of a mixed crab light body since it has a (ZnM5CdM5)S:Ag,Ni fin light body of ppm.

As mentioned earlier, (MgMZnM)0. Ga203:M
The n-crab photon is a green light emitting sublinear type halo, and the emitted light color of this crab photon changes continuously depending on the amount of Mn activation. CIE color system chromaticity point A in Figure 4, (x=0.148,
y=0.318), A2(x=0.132, y=0.4
29) and (x = 0.103, y = 0.623) have Mn activation amounts of 1 x 10 atoms/mol and 3 x
10-atom/mol and 7×10-3g atom/mol
(Mgo.7ZnM)0.0a203 when l:
This shows the luminous chromaticity point of the Mn fin light body, and as is clear from Figure 4 (Mgo.7Zn sail) 0.0a203:
The color of the light emitted from the Mn halo moves toward longer wavelengths as the amount of Mn activation increases. On the other hand, the (Zn,Cd)S:Ag,Ni crab photometer, which is a superlinear type crab photon, continuously changes its emission color in response to changes in the matrix composition ratio ZnS/CdS, and ZnS/CdS is It shows red light emission in the range of 35/65 to 20/80. Chromaticity point B(x
=0.548 y=0.436), B2(x=0.62
4, y=0366) and &(x=0.652, y=0
．． 324) has Ag and Ni activation amounts of 5 x 10-5 g/g and 8 ppm, respectively (Z~.35
Cdo. 5) S: Ag, Ni crab light body, (Zno.25C
4.75) S:Ag,Ni photoreceptor and (Zno.2o
Go to C. ) S: indicates the emission chromaticity point of the Ag, Ni light body. The above Mn activation amount is 3 x 10-3 g atoms/mo
(MgMZnM)0. Ga203: Mn type photon (emission chromaticity point) and Ag and Ni activation amount are each 5
×10-5g/g and 8ppm (Zno.25
Cdo. Flower) S: Ag, Ni crab photophores (emission chromaticity point B2)
In a cathode ray tube in which a light film is made of a mixed light material prepared by mixing the following at a weight ratio of 10:1, the light film has a current density of 2.
．． Chromaticity point W (x=0.375,
y=0.390). Therefore, by setting the black-and-white television signal-to-electron beam conversion so that the current density value of the highlight signal is 2.01 A/, the highlight signal changes from the highlight signal to white at the chromaticity point W. Each signal applied to the dark level signal can be displayed in a chromatic color that continuously changes from W to the A2 direction on a straight line connecting the chromaticity points W and chromaticity points.
By using the cathode ray tube of the present invention in combination with a black-and-white television signal, the cathode-ray tube of the present invention can produce a completely monotonous image that satisfies the viewer's color preferences without the monotony of images seen in conventional black-and-white television systems. It is possible to easily display images with new tones, and its industrial utility value is enormous as mentioned above.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a black and white television cathode ray tube. FIG. 2 shows white in the CIE color system in chromaticity coordinates. FIG. 3 schematically shows the current density-brightness characteristics of each crab light in the halo film of the cathode ray tube of the present invention using a mixed crab light made by mixing two types of crab light. 3rd A
The figure shows a case where the two types of crab photons are a sublinear type crab photon A and an IJ near type crab photon B, and in Figure 3B, two types of crab photons are a linear type crab photon A and a superlinear type crab photon. In the case of body B, FIG. 3C shows the case where the two types of crab light bodies are sublinear type crab light body A and superlinear type crab light body B, respectively. Figure 4 shows (Mgo.7Zn Cape) 0. Ga20
3: Emission chromaticity point of Mn crab photogen, (Zn, Cd)S:Ag
, is a diagram showing, on the CIE color system, the emission chromaticity points of the Ni crab light body and the light emission chromaticity of the cathode ray tube of the present invention in which the crab light film is a mixed pot light body formed by mixing both of the above-mentioned rear light bodies. . 1...
Funnel, 2... Neck part, 3... Electron gun, 4... Face plate, 5... Crab light film, 6. ...Electron beam. FIG. l FIG. 2 FIG. 3A FIG. 3B FIG. 3C FIG. 4

Claims (1)

[Claims] 1. In a cathode ray tube consisting of one electron gun and a funnel having a fluorescent film on the entire surface of the face plate facing the electron gun, the fluorescent film is made of a mixture of two or more types of phosphors, and at least one of the types is used. The phosphor has non-linear current density-luminance characteristics, and the emission color of the phosphor film changes continuously, including white in the CIE color system, in response to changes in the beam current, and A cathode ray tube characterized in that when the phosphor film is irradiated with an electron beam corresponding to a black and white television signal, the highlight signal is displayed in white, and each signal between the highlight signal and the dark level signal is displayed in chromatic colors.