JPH0782823B2 - Planar electron emission device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a planar electron emission device of a light emitting display device using a cathode ray.

[Conventional technology]

FIG. 4 is a perspective view showing a planar electron emission device in which a plurality of linear cathodes which are conventionally used are arranged in a cathode ray display device. In the figure, (1) is one flat electrode of the cathode ray display device, (2) is a support arranged and fixed on the surface of the flat electrode (1), and (3) is a support (2). A linear cathode whose both ends are supported,
A plurality of linear cathodes (3) are arranged in parallel on the planar electrode (1) to form a planar electron emission device (4). FIG. 5 is a diagram showing the electron emission distribution characteristics of this conventional example in association with the arrangement position of the linear cathode (3). FIG. 5 (a) is a thermoelectron emission amount distribution characteristic diagram, and FIG. 6A is a characteristic diagram showing an electric field distribution in which the right half is applied to the linear cathode (3), and the left half is a trajectory of an electron flow emitted from the linear cathode (3). In this conventional example, the planar electrode (1)
By applying an appropriate voltage to an electrode (not shown), a parallel electric field as shown by the broken line C is formed, and the electrons emitted from the linear cathode (3) are shown by the solid line a. Accelerated and converged along the path. As a result, the distribution of the amount of electron emission has a peak at the position of the linear cathode (3) as shown by the solid line b.

It is to be noted that a high-voltage electrode that forms a parallel electric field applied to the linear cathode (3), accelerates the electrodes and emitted electrons and focuses them on the display surface is necessary in the configuration, but it is directly related to the invention of the application. Since it is not related, detailed description will be omitted.

[Problems to be solved by the invention]

The conventional planar electron emission device is configured as described above, and since the electric field distribution in the vicinity of the linear cathode (3) is a planar electric field, the emitted electrons are emitted from the linear cathode (3).
Since the acceleration is carried out while holding the line image of, the distribution of the amount of electron emission is not uniform as shown in FIG. 5 (b). Therefore, when this planar electron emission device is used for a cathode ray display device, there is a problem in that the display surface thereof has a poor brightness distribution characteristic.

The present invention has been made in order to solve the above problems, and an object thereof is to obtain a planar electron emission device in which the distribution of the amount of electron emission is uniform over the entire surface.

[Means for solving problems]

A planar electron emission device according to the present invention is provided on a surface of the planar electrode in parallel with and corresponding to a plurality of linear cathodes arranged in parallel on a plane separated from the planar electrode by a predetermined distance. And a plurality of projecting electrodes made of a conductive material.

[Work]

By applying an appropriate electric potential to the protruding electrodes arranged on the surface of the planar electrode in parallel with each linear cathode in the present invention, the cylindrical electric field centering on each linear cathode and the linear cathode are generated. An electric field having a distribution that becomes a parallel electric field from the semi-cylindrical electric field is formed as the distance increases. Therefore, the electrons emitted from each linear cathode are
First, a cylindrical electric field accelerates along a radial path, and when it approaches a semi-cylindrical electric field or a parallel electric field, it is uniformly accelerated in the electric field direction. Be uniform.

Example of Invention

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

FIG. 1 is a perspective view of this embodiment, and the same parts as those of the conventional example shown in FIG. 4 are designated by the same reference numerals. In the figure,
Reference numeral (5) is a protruding electrode, which is formed in a cylindrical shape having a semi-elliptical cross section provided on the surface of the flat electrode (1) in parallel with the linear cathode (3). The planar electrode (1) and the protruding electrode (5) form a back electrode (6). As shown in FIG. 2 (b), the portion of the back electrode close to the linear cathode is convex, and the portion between adjacent linear cathodes has no protruding electrode. It is concave. The portion of the planar electrode that is not substantially protruding with respect to the protruding electrode is called a recess.

FIG. 2 is a view showing the electron emission distribution characteristics of this embodiment in correspondence with the arrangement position of the linear cathode (3).
Shows the electron emission distribution characteristic diagram, and FIG. 6B shows the electric field distribution applied to the linear cathode (3) in the right half, and the path of the electrons emitted from the left half linear cathode (3).

When an appropriate electric potential is applied to the flat electrode (1) on which the protruding electrode (5) is arranged, as shown by a broken line f in FIG. 2 (b), a line is generated near the linear cathode (3). A cylindrical electric field is formed around the cylindrical cathode (3), and an electric field having a distribution of a semi-cylindrical shape to a parallel electric field is formed as the distance from the linear cathode (3) increases. As a result, the electrons emitted from the linear cathode (3) were first accelerated by the cylindrical electric field along the radial path as shown by the solid line a, and approached the semi-cylindrical electric field and the parallel electric field. By the way, the electric field is uniformly accelerated.

Therefore, the distribution characteristic of the amount of electrons emitted from the linear cathode (3) has a distribution as shown by the solid line e in FIG. 2 (a), which is a uniform characteristic over the entire surface.

In this way, the protruding electrode (5) has an appropriate electric field distribution in the vicinity of the linear cathode (3), which has a uniform electron emission by appropriately selecting the cross-sectional shape and size and applying an appropriate electric potential. It can be changed to obtain the quantity distribution characteristic.

It is to be noted that an electrode for forming a parallel electric field at a position apart from the linear cathode (3) and a high-voltage electrode for accelerating emitted electrons to reach the display surface are required as in the conventional device. Since it is not directly related, the description is omitted.

In addition, in the above embodiment, the protruding electrode (5) is formed in the shape of a cylinder having a semi-elliptical cross section, but the shape is not limited to this, and for example, as shown in FIG. The shape may be a semi-cylindrical shape, a trapezoidal shape as shown in FIG. 2B, a rectangular shape as shown in FIG.

〔The invention's effect〕

As described above, according to the present invention, since the protruding electrodes having a cross-sectional shape that changes the electric field distribution in the vicinity of the linear cathode into a cylindrical shape are arranged on the surface of the flat electrode, it is uniform over the entire surface. There is an effect that a plane type electron emission device having various electron emission amount distribution characteristics can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, and FIG. 2 (a).
Is a distribution characteristic diagram of the electron emission amount of this embodiment, FIG. 7B is a diagram showing the electric field distribution of this embodiment and the path of the emitted electrons, and FIGS. FIG. 4 is a perspective view of another conventional planar electron emission device, FIG. 5 (a) is a distribution characteristic diagram of the electron emission amount of this conventional example, and FIG. FIG. 6 is a diagram showing an electric field distribution and a trajectory of emitted electrons in this conventional example. (1) ... flat electrode, (3) ... linear cathode, (4)
...... Planar electron emission device, (5) …… Projective electrode. In each drawing, the same reference numerals indicate the same or corresponding parts.

Claims (3)

[Claims] 1. A planar electron-emitting device in which a plurality of linear cathodes are arranged in parallel on a plane separated from the planar electrode by a predetermined distance, wherein the planar electrode is provided from each of the plurality of linear cathodes. A projection electrode arranged in parallel to each of the plurality of linear cathodes at a position of a foot of a perpendicular drawn on a plane including the back electrode composed of the projection electrode and the planar electrode. And a portion of the back electrode close to the linear cathode is convex toward the linear cathode side, and the portion of the back electrode corresponding to a portion between the linear cathodes adjacent to each other is A planar electron emission device characterized in that the linear cathode is made concave without providing a protruding electrode. 2. The flat electron-emitting device according to claim 1, wherein the protruding electrode is formed in a cross-sectional shape and size that forms a cylindrical electric field in the vicinity of the linear cathode. . 3. The cross-sectional shape of the protruding electrode is semi-elliptical,
The planar electron emission device according to claim 2, which is a semi-circle, a trapezoid, a rectangle, or a combination thereof.