JPS5826609B2 - Ink Yokusen Hiyoji Souchi - Google Patents

Description

[Detailed description of the invention] The present invention relates to cathode ray display devices.

Conventional cathode ray display devices that have the function of storing images include ones that have a storage function by controlling the electron beam by charging up electrons in a grid. This had the disadvantage that the charging grid used for this purpose was affected and the image became distorted if used for a long time, and signals could only be input using electrical signals.

There are also cathode ray display devices that have a storage function by adding computer control or other elements or devices, but they have the disadvantage of having a large number of accessories and becoming complex.

Accordingly, an object of the present invention is to provide a cathode ray image display device which improves the above-mentioned drawbacks and which allows both electric and optical means to be used as input signals for image display, thereby making it possible to store and display images. It is about providing.

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

Referring to FIG. 1, cathode ray sources 6 having photoelectron emission ability are arranged in matrix dots, and each dot has a flat cathode 5 with an electrode group 7 wired in a matrix-addressable manner.
and a transparent insulating substrate 1 are arranged to face each other, a vacuum of 10'torr or less is maintained between them, and a cathode plate 5 is placed at that location.
A porous member 4 is installed to provide one-to-one correspondence between the dots 6 of the upper cathode ray source and one picture element on the transparent insulating substrate 1.

On the vacuum side of the transparent insulating substrate 1, there is a transparent electrode 2 for accelerating electrons and a phosphor 3 coated thereon.

In FIG. 1, the number of holes in the porous member 4 is shown to be equal to the number of dots 6 on the cathode plate 5, but it may be larger.

Among these operations, when displaying and storing images using electrical signals,
When a voltage is applied to an arbitrary dot using the electrode group 7 to cause a current to flow and emit electrons, the emitted electrons are accelerated by the electric field applied between the cathode plate 5 and the transparent electrode 2 as shown in a. It passes through the corresponding holes in the porous member 4 and hits one picture element on the phosphor, which is in one-to-one correspondence, causing the phosphor to emit light by electro-optic conversion.

Assuming that the light emitted from the phosphor is isotropic, about 50 pieces of light will pass forward through the transparent electrode 2 and the transparent insulating substrate 1, and of the remaining 50 pieces, the remaining 50 pieces will go straight to the original dot. It is blocked by the porous member 4.

The light beam that travels straight to the original dot hits the photocathode and releases photoelectrons.

The emitted electrons are returned to the cathode plate 5 and the transparent electrode 2 as described above.
The phosphor is accelerated by the electric field applied between the phosphor and the phosphor and hits one picture element of the phosphor 3, which is in one-to-one correspondence, causing the phosphor to emit light.

By repeating such a cyclic process, a signal once applied is stored as light on the phosphor surface.

When the input signal is provided as an optical signal, the above cycle process is performed using light incident from the front of the transparent insulating substrate 1 or the rear of the cathode plate 5, for example, from a light beam or the like having an emission spectrum as shown in FIG. Start from.

First, when light is applied to a certain picture element, it passes through the phosphor 3, passes through the holes in the porous member, hits the photocathode in a one-to-one correspondence, and emits photoelectrons, or the photocathode plate 5 Photoelectrons are emitted by light incident on arbitrary dots from the rear of the dot, and the emitted electrons are accelerated by the electric field applied between the transparent electrode 2 of the cathode plate 5 and the picture element in one-to-one correspondence. When it hits the phosphor, it causes it to emit light.

The photocathode used here emits electrons in response to light irradiation; for example, Na
If 2KSb is used, it will have a photoelectron emission spectrum as shown in Figure 2A, and the maximum wavelength at which it reacts with light is limited to 650 nm.

Therefore, while matching the wavelength of the light used as an incident signal with the 370 nm peak of the photoelectron emission spectrum (Figure 2 A), a filter or the like having a transmittance as shown in Figure 2 is used on the transparent insulating substrate 1 to transmit the photoelectron. By blocking light at the peak wavelength of the photoelectron emission spectrum of the cathode material, interference with external light can be prevented, and a stable image can be maintained for a long time.

(In the case of signal input using an optical signal from the front of the transparent insulating substrate 1, it is necessary to exclude the above filter.

) As the phosphor, for example, ZnO:Zn(P 15 )
Use.

As shown in Figure 2, the emission spectrum of this phosphor has peaks at wavelengths of approximately 400 nm and 500 nm. It almost coincides with the sensitivity wavelength, and is responsible for the light part of the above-mentioned photo-electron cycle process.The peak at 500 nm is near the shoulder of maximum visibility, and is used for image display after passing through the filter.

The electron-light cycle process described above is repeated,
In order to continue emitting light each time, the initial n electrons or light must become n or more in each cycle.

This condition can be satisfied by adjusting the accelerating voltage applied between the cathode and the anode.

Therefore, when erasing a stored image, it is possible to immediately erase the photo-electron conversion cycle by cutting off the accelerating voltage.

As explained above, the present invention includes an insulating substrate covered with electrodes and a phosphor, a member provided with a plurality of holes through which electrons and light can pass, and a dot-shaped dot at a position corresponding to each hole. Since there are only three components, including a cathode with an electron source of 1, a very thin flat plate type storage device can be provided.

It also has the advantage that memory can be erased very easily by selecting the voltage between the electrodes provided on the insulating substrate and the cathode.

Furthermore, since it has a memory function in the photo-electronic conversion cycle process, it does not have the disadvantage of producing images by itself, and stable images can be obtained for a long time.

This device is useful as a still image television, a Wright Ben-written image display, a high brightness slide projection screen, and the like.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a cathode ray display device according to an embodiment of the present invention;
FIG. 2 is a characteristic diagram of the components used in the device. DESCRIPTION OF SYMBOLS 1... Transparent insulating substrate, 2... Transparent electrode, 3... Fluorescent material, 4... Porous member.

Claims (1)

[Claims] 1. A cathode having a photoelectron emission ability, an anode coated with a phosphor, and a cathode disposed between the cathode and the anode in a vacuum.
1. A cathode ray display device comprising a member having a large number of holes through which electrons and light can pass, and the cathode having a dot-shaped electron source provided at a position corresponding to the hole of the member.