JPS6311675B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to a multicolor display type cathode ray tube device constructed by arranging a large number of small cathode ray tubes as pixels.

Conventionally, huge display devices used, for example, for electronic display boards at baseball stadiums, advertising images and messages on the roofs or walls of buildings, and information displays on highways, etc., have been made by arranging a large number of light bulbs. The image was created by selectively blinking, which caused a number of problems.

To give some examples, for example, in the case of a light bulb, the light is obtained by the red heat of the filament, so the emitted light is mainly orange or white-orange. For this reason, it has been quite difficult to generate a large amount of colored light, such as blue or green, from these light bulbs. In addition, in the case of such a light bulb method, in order to modulate the brightness of each pixel, it is necessary to turn on and off the applied current to the filament, or to vary the applied current, but these light bulbs do not change the frequency The response is extremely low, below 10Hz.
There is a problem in that the color of the emitted light itself changes depending on the applied current, and it is difficult to use it for half-tone display or color display that combines light of any color. Furthermore, such huge display devices typically have thousands to tens of thousands or more of 20 to 40 W light bulbs lined up, which poses many problems such as power consumption and heat generation.

Therefore, the inventor proposed the use of a cathode ray tube as a light source for the above-mentioned display device.

In other words, a large number of small cathode ray tubes with monochromatic fluorescent screens such as red, green, and blue are lined up to display a desired image. Not only was the efficiency greatly improved compared to light bulbs, but it also had many advantages, such as the ability to obtain a light source of any color by selecting the phosphor used. In this way, when a cathode ray tube is used as a light source for a huge display device, the performance is lower than that of a conventional light bulb type.
It is clear that the configuration can be advantageous when comparing reliability, maintenance cost, power consumption, etc.

The present invention aims to further improve the performance of such a huge display in which each pixel is composed of a cathode ray tube, by shortening the optimum viewing distance.

FIG. 1 is a diagram showing an example of the structure of a cathode ray tube for a light source used as a light source for a huge display, which the inventor has so far implemented as a prior invention. It is a cylindrical vacuum envelope. This vacuum envelope 1 has a face glass 3 having a phosphor screen 2 adhered to its inner surface at one end, an electron gun 4 for irradiating the entire surface of the phosphor screen 2 with an unfocused electron beam 10 at the other end, and It has a stem portion 5 that has terminals for applying a required voltage to each part of the electron gun 4 and that closes off the vacuum envelope 1 . Reference numerals 6, 7 and 8 are a heater, a cathode and a grid, respectively, constituting the electron gun 4.

To explain the operation of this cathode ray tube, first, a negative voltage is applied to the grid 8 with respect to the cathode 7, and a predetermined current is applied to the heater 6.
When the grid 8 is heated to bring the voltage of the grid 8 close to the potential of the cathode 7, an electron beam 10 is emitted from the cathode 7 onto the phosphor screen 2.
is fired towards. This electron beam 10 becomes an unfocused beam with a predetermined spread (θ) depending on various conditions such as the diameter of the hole 9 provided in the center of the grid 8, the distance between the grid 8 and the cathode 7, and the anode voltage. The entire surface of the phosphor screen 2 is irradiated, causing the phosphor screen 2 to emit light in a color corresponding to the phosphor.

These cathode ray tubes are arranged regularly, for example, as shown in FIG. 2, with the side with the phosphor screen facing you.
For example, as shown in Figure 2, this arrangement of cathode ray tubes is such that for every 212 cathode ray tubes that emit green light, one cathode ray tube 22 that emits red light and one cathode ray tube 23 that emits blue light are arranged. There is. This is because the resolution that governs the clarity of images made up of a collection of these light sources is determined by the number of green pixels, and red and blue only serve to color this. The inventors have already confirmed that this theory is correct by creating a giant display with the arrangement shown in Figure 2. Until now, such cathode ray tube arrays have had a diameter of approx.
When 29mm cathode ray tubes are lined up, they are lined up at a 40 to 45mm pitch for outdoor use due to problems with the waterproof structure and the configuration and wiring of the sockets for supplying various voltages to the cathode ray tubes. However, in this case, the optimum viewing distance from the viewpoint of image visibility, degree of color mixing, etc. was approximately 70 m or more. This optimum viewing distance of 70m or more is not a problem at all for displays installed in stadiums such as baseball stadiums, but when considering uses such as outdoor advertising, it becomes clear that this viewing distance needs to be halved. Ta.

In order to reduce this viewing distance by half, the present invention employs a method in which the mounting pitch of the cathode ray tube for the light source remains the same, but the fluorescent screen of the cathode ray tube, which serves as a pixel, is divided into two, so that one cathode ray tube emits two primary colors. The purpose is achieved by using.

First, consider the case where the fluorescent screen of all cathode ray tubes is divided into two parts.

Its configuration is as shown in FIG.
It consists of: In other words, this idea is based on the fact that the sharpness of the image mentioned earlier is dominated by green,
Nowadays, the theory that red and blue exist for coloring has been proven, and the configuration shown in Figure 3 has the same viewing distance as the one shown in Figure 2 even if the mounting pitch of each cathode ray tube is the same as in Figure 2. In addition, since red and green, which are the most problematic color misalignment, can be arranged close to each other, it is possible to obtain an image that is easier to see than before when displaying yellow, for example.

In such a two-color cathode ray tube, for example, as shown in FIG. 4, the phosphor screen inside the face part at one end of the vacuum envelope 1 is divided into two, and two types of phosphor screens 2a emitting light of different colors are formed. 2b, and unfocused electron beams 10a, 10 are applied from opposite positions so that the electron beam can irradiate almost the entire surface of each phosphor screen 2a, 2b.
It is sufficient if the structure is such that it can fire b.

As mentioned above, when a single cathode ray tube emits two different primary color lights, and both of them have the function of emitting green light,
If the size of the display screen is the same and the number of cathode ray tubes used is the same, the definition of the display screen will be doubled and the viewing distance will be shortened.

Next, based on the above-mentioned viewpoint, the present invention will be described which improves the visual distance more economically.

As shown in FIG. 5, the present invention uses a monochrome cathode ray tube 21 as a cathode ray tube that emits green light, and a two color cathode ray tube 33 as a cathode ray tube that emits red and blue colors.
The configuration is a combination of these monochrome cathode ray tubes 21 and two-color cathode ray tubes 33. If configured in this way, the viewing distance will be greatly improved, similar to a configuration made entirely of two-color cathode ray tubes, and it will also be possible to combine use with monochrome cathode ray tubes, which have a simpler structure and are cheaper than two-color cathode ray tubes. Therefore, the cost of the display panel is significantly lower than when two-color cathode ray tubes are used for everything.

Up to now, we have explained full-color displays, but even more advanced applications, although not particularly shown, can be used, for example, in electronic news boards, which were conventionally constructed with light bulbs arranged side by side, and message boards on expressways. If it is composed of only red and green single-tube two-color cathode ray tubes, it will be red or green depending on the type of message.
It is possible to display in multiple colors such as green and yellow, which not only increases the amount of displayed information but also makes it extremely easy to see.

As described above, the present invention improves the image quality of a particularly large multicolor display panel and improves the optimum viewing distance, thereby making it possible to obtain a cathode ray tube device that is easier to view.

[Brief explanation of the drawing]

Figure 1 is a structural diagram of a conventional light source cathode ray tube, Figure 2
The figure is a front view of a large number of light source cathode ray tubes shown in FIG. 1 arranged side by side, FIG. 3 is a reference diagram for explaining the present invention, and FIG. FIG. 5 is a front view showing an embodiment of the present invention. In the figure, 2 is a fluorescent screen, 10 is an electron beam, 2
1, 22, 23 are each single-tube monochromatic cathode ray tubes, 3
Reference numerals 1, 32, and 33 are single-tube two-color cathode ray tubes. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A monochromatic cathode ray tube including a phosphor screen in which a green light-emitting phosphor is coated on almost the entire surface of the face glass, and an electron gun that is provided opposite to the phosphor screen and causes the green light-emitting phosphor to emit light; A phosphor screen having a red light-emitting phosphor coated on almost half of the surface and a blue light-emitting phosphor coated on the other half, and a phosphor screen provided opposite to this phosphor screen to cause each of the red and blue light-emitting phosphors to emit light individually. A multicolor display type cathode ray tube device comprising: a two-color cathode ray tube including an electron gun; and a plurality of pairs of the monochrome cathode ray tubes and two-color cathode ray tubes arranged adjacent to each other.