JPS59146140A - Planar picture image display device - Google Patents

Abstract

PURPOSE:To improve brightness of electron beam spot by arranging a focus electrode having an electron beam pass area larger than the electron beam pass hole of take-out electrode between a linear hot-cathode and electron beam take- out electrode. CONSTITUTION:A plurality of linear electrodes 22 are provided in parallel with a cathode 2 between a linear hot-cathode 2 and an electron beam take-out electrode 3. The electrodes 22 are arranged with same pitch with the cathode 2 to coincide the center of electron beam pass area 23 to be formed by the electrode 22 with that of cathode 2. In such a manner, predetermined voltage is applied onto the electrode 22 to increase the electron beam density passing through the electron beam pass hole in the electrode 3 while to increase the electron beam density in vertical direction thus to improve the brightness of electron beam spot. Furthermore a linear electrode is provided between the electrodes 2, 3 in the direction perpendicular with the cathode 2 to improve the electron beam density in horizontal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flat panel image display device using an electron beam.

In recent years, various devices have been desired to be smaller and thinner, and the same holds true for image display devices (eg, television receivers).

In particular, by making it thinner, it can be used for wall-mounting, car-mounting, and various other applications.

Conventional configurations and their problems Conventionally, matrix-type flat display devices using EL, plasma, liquid crystal, etc. have been developed, but they still lack sufficient performance in terms of brightness, luminous efficiency, color display, etc. cannot be obtained, and the image display like that of a television receiver is
It has not yet reached the level of practical use.

On the other hand, an attempt to construct a flat panel display device using an electron beam has been reported.1 In other words, this device uses a flat matrix type electron beam control electrode (C
Therefore, it is used to control and display characters or images.

In more detail, the electron beam emitted from multiple linear hot cathodes is taken out by each electrode section, deflected, controlled, accelerated, and impinged on a light emitting surface (phosphor surface) to display an image. This is a display device.

FIG. 1 shows an example of a main part configuration diagram of this type of display device.

This display device includes, in order from the back to the front, a back electrode 1, an electronic beacon, a linear hot cathode 2 as a source, an extraction electrode 3, a vertical deflection electrode 4, a heel flow control lightning pole 5, and a horizontal focusing electrode 6. , a horizontal deflection electrode element, an electron beam accelerating electrode 8 and a light emitting surface 9 are arranged and constituted, and these are housed in the evacuated interior of a flat glass bulb (not shown).

Special aperture U39-146140 (2) The linear hot cathode 2 as an electron beam source is stretched in the horizontal force direction so as to emit an electron beam linearly distributed in the horizontal force direction. 2 at appropriate intervals 1. A plurality of them (here, only four, 2(a) to 2) are shown) in the vertical direction.

In this embodiment, it is assumed that there are five (2 (a) to 2 (evening)).

These linear hot cathodes 2, for example φ1o~201tm
An oxide cathode material is coated on the surface of a tungsten wire.

The electron beams are controlled to be emitted sequentially from the linear hot cathode 2 (a) in the north for a fixed period of time. The back electrode 1 is formed by a coating film of a conductive material 11 adhered to a glass plate 10Kl, and is emitted from a linear hot cathode 2 by a groove 5.
It has the effect of pushing out the electrons only in the forward direction.

The extraction lightning @ 13 is a conductive plate 13 having an M-beam passage hole 12 in the horizontal direction facing each of the linear hot cathodes 2 (A) to 2 (Y), and the lightning emitted from the linear hot cathode 2. The electrons are taken out through the passage hole 12, 6, , , -2
・And focused in the vertical direction.

A plurality of vertical deflection electrodes 4 are arranged horizontally at intermediate positions of the passage holes 12, and conductors 15 and 15' are provided on the upper and lower surfaces of the insulating substrate 14, respectively. It is configured.

A vertical deflection voltage is applied between the opposing conductors 16 and 16', thereby deflecting the electron beam in the vertical direction and simultaneously focusing it in the vertical direction.

In this embodiment, the electron beam from one linear hot cathode 2 is directed vertically by a pair of conductors 15 and 15'.
Deflect to the position of the line. The 16 vertical deflection electrodes 4 constitute 15 pairs of conductors corresponding to each of the 15 linear hot cathodes 2.
The electron beam is deflected so as to draw a zero horizontal line.

Next, the control electrodes 5 are composed of conductive plates 1, each having a vertically elongated electron beam passage hole 16, and a plurality of control electrodes 5 are arranged horizontally in parallel at predetermined intervals.

6. In this embodiment, 320 conductive plates 17 for control electrodes are provided. (Only nine are shown in the figure.) Each of these control electrodes 5 divides the electron beam horizontally into one pixel and extracts it, and the amount of the electron beam passing through it is determined according to the video signal for displaying each pixel. Control.

Therefore, if 320 control electrodes 5 are provided, 320 picture elements can be displayed per horizontal line.

To display images in color, each picture element is R/IB.
-B is used for display with three color phosphors, and each control electrode 6
The RGB video signals are sequentially added to the . Still, 320 sets of video signals for one line are simultaneously applied to the 320 control electrodes 5, and the video for one line is displayed at one time.

The horizontal focusing electrode 6 is composed of a conductive plate 19 having a plurality of vertical electron beam passing holes 18 facing the passing holes 16 of the control electrode 5, and focuses the electron beam for each pixel divided in the horizontal direction. Each is focused horizontally into a narrow electron beam.

The horizontal deflection electrode 7 is located at the edge 2 of the electron beam passage hole 18. −
7. Consists of a plurality of conductive plates 20 arranged vertically in the middle of each plate, and a horizontal deflection voltage is applied between each conductive plate 20 to direct the electron beam of each pixel in the horizontal direction. The light emitting surface 9 is used to sequentially irradiate each of the R, G, and B phosphors to cause them to emit light.

In this embodiment, the deflection range is the width of one picture element for each electron beam.

The acceleration electrode 8 is composed of a plurality of conductive plates 21 provided horizontally at the same position as the vertical deflection electrode 4.
The electron beam is accelerated so as to collide with the light emitting surface 9 with sufficient energy.

The light emitting surface 9 is constructed by coating the back surface of a glass plate with a phosphor that emits light by electron beam irradiation, and adding a metal back layer. (The phosphor/metal back layer is not shown.) A conventional flat panel image display device has been configured as described above.

As a result of employing this type of configuration, it is possible to realize a thin and high-resolution image display, but various problems arise when an electron beam actually collides with the light emitting surface.

One of the major problems is insufficient brightness.

The brightness obtained with conventional TV receivers, etc. is approximately 300 fL.
Therefore, at least a luminance of 1oOfL or more is required.

Conventionally, the area of the electron beam passage hole provided in each electrode portion has been narrowed in order to maintain a good focus state of the electron beam spot.

In this case, the electron beam passing through each electron beam passage hole
The amount decreases, and the brightness decreases to i~.

The luminance and I~ are only a few tens of fL.

As a measure to improve brightness, a method is needed to more efficiently extract the electrons emitted from the linear hot cathode and extract them from the electrode as an electron beam.

FIG. 2 shows a conventional state in which electrons are focused on an extraction electrode.

The focused electric field formed by the applied voltages of the back electrode 1, the linear hot cathode 2, and the electrode 3 is shown by a broken line.

9, - In this case, the applied voltage is: EB: back electrode applied voltage (for example -3oV) Exp
: Linear hot cathode applied voltage (e.g. -20V) EG: Extracting electrode applied voltage (e.g. +5V) EB<EKP・
・・・・・・・・・ (1) EB (EG・・・・・・・
・・・・・・(2) P<EG to E ・・・・・・・・・
(3) Under the conditions of equations (1) to (3), the electrons emitted from the linear hot cathode 2 become an electron beam focused by the extraction electrode 3.

When the voltage applied to the back electrode 1 is deepened and the focusing electric field is further strengthened, the number of electron beams passing through the electron beam passing hole 12 provided in the extraction electrode 3 increases.

However, as the voltage applied to the back electrode 1 increases, the number of electrons emitted from the linear hot cathode 2 decreases. In other words, it is not possible to obtain an electron beam with a high beam current density by extracting electrons to be emitted from the linear hot cathode and using the l-electrode.

Conversely, increasing the voltage applied to the extraction electrode 3 produces the same effect, but the energy increases when the electron beam passes through the hole 12 at the 10° of the electron beam passing through the extraction electrode 3, which affects later control, etc. This is not a good idea as it will cause various problems.

OBJECTS OF THE INVENTION The object of the present invention is to take measures against the brightness direction -L of an electron beam spot in a flat panel image display device using an electron beam.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention to solve the above-mentioned conventional problems will be described below.

The present invention provides an efficient means for extracting an electron beam as a countermeasure against brightness deviation of an electron beam spot.

As a means of maximizing the emitted electrons of the linear hot cathode and obtaining a sufficient extraction electric field, a linear or strip-shaped electrode is placed between the linear hot cathode and the extraction electrode in parallel with or parallel to the linear hot cathode. The electrodes were arranged in a direction perpendicular to each other, and an applied voltage different from that applied to the back electrode was applied.

Description of examples 11,・・・ An embodiment of the present invention is shown in FIG.

As shown in FIG. 3, a plurality of linear electrodes 22 (for example, a tungsten wire with a wire diameter of 100 μm) are provided between the linear hot cathode 2 and the extraction electrode 3 in parallel with the linear hot cathode 3 . In the figure, the linear electrode 22 is provided between the linear hot cathode 2 and the extraction electrode 3, but depending on the voltage applied to each electrode, it may be located at the same position as the linear hot cathode 2. Side or take out electricity lol!
The linear electrodes 22 have the same pitch as the linear hot cathode 2, and the center of the electron beam passing region 23 formed by the linear electrodes 22 and the center of the linear hot cathode 2 are substantially aligned.

The voltage applied to the back electrode 1 (for example -20V) and the voltage applied to the linear hot cathode 2 (for example -20V) are matched, and a predetermined voltage (for example -10V) is applied to the newly provided linear electrode 22.
) is added.

In the embodiment, the voltage applied to the back electrode 1 and the voltage applied to the linear hot cathode 2 were made equal to each other, but the voltage applied to the back electrode 1 may be increased slightly.

In other words, most of the electrons emitted from the linear hot cathode 1Vc are reduced.

JP-A-59-146140 (4) 1~ However, as mentioned above, the density of the electron beam focused on the electron beam passing hole 12 provided in the extraction north pole 3 is low.

Therefore, if a predetermined applied force is applied to the newly provided linear electrode 22, a focused electric field as shown in FIG. 3 will be generated, and the electronic vino
The density of the electron beam passing through the passage hole 12 becomes high.

As a result, the electron beam density in the vertical direction increases, and the total brightness of the electron beam spot increases.

The same applies to the horizontal direction, and an example thereof is shown in FIG.

In the case of the horizontal direction, a plurality of linear electrodes 24 (similar to the tungsten wire used in the vertical direction) were provided between the linear hot cathode 2 and the extraction electrode 3 in a direction perpendicular to the linear hot cathode 2.

The linear electrodes 24 are arranged at the same pitch as the electron beam passing holes 16 and 18 provided in the control electrode 6 and the focusing electrode 6, and the electron beam passing holes formed by the center of the electron beam passing holes 16 and 1B and the linear electrode 24 are arranged at the same pitch. Area 2513,... Align almost with the center.

The voltage applied to the back electrode 1, the linear hot cathode 2, the extraction electrode 3, and the linear electrode 24 is applied to the linear electrode 2 in the vertical direction as described above.
The relationship is the same as when 2 is adopted.

Effects of the Invention If the present invention as described above is used, the following effects will be produced.

It became possible to suppress the loss of electrons emitted from the linear hot cathode, increase the density of the electron beam focused on the extraction electrode, and improve the brightness of the resulting electron beam spot.

Specifically, a brightness of 100 fL or more was obtained.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the main structure of a conventional flat-panel image display device, FIG. 2 is a partial cross-sectional view showing an embodiment of a conventional electron beam extraction means, and FIG. FIG. 4 is a partial cross-sectional view showing a first embodiment of the extraction means. FIG. 7 is a partial cross-sectional view showing a second embodiment of the child beam extraction means. 1... Back electrode, 2... Line hot cathode, 3
...Electron beam extraction electrode, 10...
Glass plate, 11... Conductive material, 22.24...
... Linear electrode. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure 2 Figure 4

Claims (4)

[Claims] (1) It has a plurality of linear hot cathodes and an electron beam extraction electrode, and between the linear hot cathode and the extraction electrode, there is an electron beam passage area that is closer to the electron beam passage hole of the extraction electrode. A flat panel image display device characterized by disposing a focusing electrode. (2) The electrode provided between the linear hot cathode and the extraction electrode is arranged parallel to the linear hot cathode, and the center of the linear hot cathode and the center of the electron beam passing area of the electrode are aligned. A flat panel image display device according to claim 1. (3) The electrode provided between the linear hot cathode and the extraction electrode is arranged in a direction perpendicular to the linear cathode, and the center of the electron beam passage hole provided in the control electrode or the horizontal focusing electrode is connected to the electron beam of the electrode. 2. A flat panel image display device according to claim 1, wherein the centers of the beam passing areas are made coincident with each other. 2/・、-ko・ (4) The electrode provided between the linear hot cathode and the extraction electrode applies a voltage higher than the voltage applied to the back electrode and smaller than the voltage applied to the extraction electrode. Flat panel image display device.