JPS60133643A - Flat board type display device - Google Patents

Abstract

PURPOSE:To obtain a brighter picture screen by making more electrons reach the anode by means of arranging two electrodes having slit-like holes or round holes with the centers of holes of one electrode set off those of the other electrode. CONSTITUTION:Those electrons emitted from a linear electron source 21 are splitted and forcused into several eams by electrodes 22, 23. Either one of these electrodes 22, 23 is positioned in such a manner that the centers of its holes will be set off those of holes 25a of the other electrode 25. In this way, the electric field near the electrodes 22, 23 is distorted and the electron beam paths are changed, consequently increasing the amount of electrons to reach the anode and raising the brightness the higher. Thus a brighter picture screen can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a flat panel display device having a line or planar electron source.

(Structure of a conventional example and its problems) An example of an electrode group that functions to divide and focus an electron beam of a flat panel display device having a conventional line or planar electron source will be explained with reference to FIG.

A negative voltage is applied to the back electrode 1 to cause electrons from the linear electron source 2 to fly toward the electrodes 3 and 4. Electrodes 3-1: The electrons that uniformly flew to the round holes 3a of the electrodes 3 and 4.

4a (which may be a slit-like hole), the electron beams are divided and focused into several electron beams, and are focused and deflected in the vertical direction by the vertical focusing/deflection electrode 5, while the electron beams pass through the horizontal focusing/deflection electrode groups 6, 8.9, and The light is horizontally focused, deflected and modulated by the modulation electrode 7, and finally reaches the anode 10, causing the phosphor to emit light and displaying an image.

FIG. 2 is a horizontal sectional view of FIG. 1, showing holes 3a and 4a.

This shows that the center of the hole 6a coincides with the center of the hole 6a of the other electrode.

In such a configuration with many electrodes, the electron source 2
Most of the electrons emitted from electrodes 3, 4, 6°7.8.
There is a drawback that fewer electrons are absorbed by the anode 9 and reach the anode 10, and as a result, it is difficult to obtain sufficient screen brightness.

(Objective of the Invention) An object of the present invention is to provide a display device with a brighter screen by allowing more electrons to reach the anode.

(Structure of the Invention) The present invention provides two methods for dividing and focusing electrons uniformly emitted from a line or planar electron source into several electron beams.
By arranging electrodes with slit-like holes or round holes with the centers of the holes shifted, a larger focusing force is exerted.

(Description of Embodiment) An embodiment of the present invention will be described below with reference to the drawings. Third
In the figure, the configuration is such that electrons emitted from a linear electron source 21 are divided and focused into several electron beams by electrodes 2.2 and 23.

One of the electrodes 22 and 23 is arranged so that the center of its hole is offset from the hole 25a of the other electrode 25. In the figure, the electrode 23 is shifted.

This distorts the electric field near the electrodes 22, 23 and changes the electron beam trajectory. As a result of calculation using the two-dimensional finite element method, the amount of electrons passing through the holes 25 & of the electrodes 25 is better if the centers of the holes of either electrode 22 or 23 are shifted than by aligning the centers of the holes of all electrodes. was found to increase.

Therefore, the amount of electrons reaching the anode increases, and the brightness increases accordingly, resulting in a brighter screen.

The amount by which the electrodes are shifted varies depending on the dimensions of each part and the voltage applied to each electrode, but the dimensions shown in the table are as follows.

In the case of the voltage example, if the voltage is shifted by 50 μm, the amount of electrons reaching the anode will be 12 to 14 times the normal amount.

Table (Effects of the Invention) As described above, the present invention allows uniformly emitted electrons to be split and focused into multiple electron beams by using electrodes having two slits or round holes, by simply shifting the electrodes slightly. The amount of electron beams can be increased with a simple configuration of just arranging them.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional electrode configuration, Fig. 2 is a horizontal sectional view from back electrode 1 to electrode 6''!, and Fig. 3 is a horizontal sectional view showing the present invention. 1.20.・Back electrode, 2.21... Linear electron source, 3
．． 4,22.23... Beam splitting/focusing electrode, 5-9.
- Deflection/modulation electrode group, 10... anode. 'Figure 2Figure 3 2o 212223 24 25

Claims (1)

[Claims] A flat panel display device with a line or picture electron source has two slit-like holes or round holes to split and focus the electrons uniformly emitted from the electron source into several electron beams. A flat panel display device characterized in that electrodes are arranged with the centers of their holes shifted.