JPS61230248A - Display device - Google Patents

Abstract

PURPOSE:To prevent any distortion of the landing of the electron beam from occurring near supports for supporting the electrodes on a display plate so as to achieve uniform display by installing a deflecting auxiliary electrode between a deflecting electrode device and the supports. CONSTITUTION:A display device is assembled by supporting a back electrode 2, a linear cathode 3, a first grid electrode 4, a first deflecting electrode device 5, an electron-beam-controlling electrode device 11, a second deflecting electrode device 14 and an accelerating electrode device 20 in that order on supports 23 located on a display plate 16. A deflecting auxiliary electrode 25 is installed between electrodes 15 of the second deflecting electrode device 14 and one of the supports 23. A voltage of about 10kV is applied to the supports 23, a voltage of 200-700V is applied to the electrodes 15 of the device 14 and a voltage of 100-600V is applied to the auxiliary electrode 25. Due to the above structure, the electron beam is prevented from being excessively deflected toward the supports 23 around them to achieve uniform landing thereby improving display quality.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a display device using an electron source.

(Prior Art) A conventional display device has a structure as shown in FIG. 5, as shown in, for example, Japanese Unexamined Patent Publication No. 57-32554.

FIG. 5 shows a perspective view of a conventional display device, in which 1 is a metal plate that is part of an envelope, 2 is a back electrode, and includes an insulating plate 2a and a metal film inside the insulating plate. 2b, and 3 is a linear hot cathode, which is a plurality of linear hot cathodes stretched at equal intervals, and is constructed by applying an electron emitting material to a tungsten wire of, for example, 10 to 5 μΦ.

4 is a first grid electrode for extracting the electron beam emitted from the linear hot cathode 3, and has a slit-like through hole 4a along the linear hot cathode 3, and the slit-like through hole 4a extends along the entire length. It is preferable that the through hole be one through hole, but if the through hole is particularly long, it may be formed into a ladder shape in which a plurality of slits are arranged in tandem with bars inserted at appropriate intervals.

Reference numeral 5 denotes a first deflection electrode means formed of a pair of electrode substrates 6, each of which is disposed below the first grid electrode 4 so as to be parallel to the through hole 4a, and whose surface A deflection electrode 7 is formed on each side.

Positive and negative voltages are applied to a pair of deflection electrodes 7 facing each other, so that the electron beam is deflected perpendicularly to the surfaces of these deflection electrodes 7.

8. 9 and 10 are a second grating electrode, a third grating electrode, and an electron beam modulation electrode, which are laminated with each other and constitute an electron beam control electrode means 11 for modulating the electron beam that has passed through the first deflection electrode means 5, respectively. It is arranged in a shape. Slit-like through holes 12, 13 are provided in each of these electrodes 8, 9, 10 at equal intervals in a direction substantially perpendicular to the linear hot cathode.

Below the electron beam control electrode means 11 constituted by each of these electrodes 8, 9.10, a second electrode is formed by arranging a plurality of electrode pieces 15 in a stripe pattern parallel to the through hole 12.13. The deflection electrode means 14 are arranged, two adjacent electrode pieces 15 constitute a pair of deflection electrodes, and the space between any pair of electrode pieces 15 is connected to the slit-like through hole 12.13 of the control electrode means 10. We try to have a one-on-one correspondence.

Reference numeral 16 denotes a display plate formed by laminating a phosphor layer 18 on a part of the back surface of an envelope 17 made of a transparent glass container or the like, and a metal back layer 19 on the surface thereof.

Although it is possible to make the space between the second deflection electrode means 14 and the display plate 16 hollow, especially when configuring a large-sized image display device, it is possible to make the space between the second deflection electrode means 14 and the display plate 16 hollow. It is necessary to have an electrode configuration that can withstand atmospheric pressure, and it is desirable to provide the accelerating electrode 20 as a configuration for this purpose.

This accelerating electrode means has a pair of accelerating electrode substrates 21 formed of insulating substrates arranged facing each other in parallel with the linear hot cathode 3, and a plurality of stripes formed on the surface of each accelerating electrode substrate 21. The electrodes 22 are arranged in parallel, and the plurality of striped electrodes 22 allow the acceleration voltage to be divided and applied. The accelerating electrode 2o is arranged in parallel at a position corresponding to the first deflection electrode means 5.

Reference numeral 23 denotes a thin metal plate support, which is fitted to the lower end of the acceleration electrode substrate 21 so as to be orthogonal to each other.

FIG. 6 is a side sectional view of a conventional display device, showing a first deflection electrode means 5, a spacer 24 for maintaining a constant distance between each electrode 8, 9, 10, an accelerating electrode 2o and a support 23. The structure is such that the cathode side of the metal plate 1, which is a part of the envelope, and the display panel 16 side are opposed to each other via the metal plate 1, which is a part of the envelope, and can withstand atmospheric pressure.

Therefore, the back surface on the opposite side of the display panel 16 can be constructed from the metal plate 1, resulting in a reduction in weight.

In this display device, the linear hot cathode 3 has a back electrode 2 and a first
The electron beam is taken out forward by the grid electrode 4, and the first
The electron beam is deflected and focused in the Y direction by the deflection electrode, modulated by the electron beam control electrode means 11, deflected in the X direction by the second deflection electrode, and accelerated by the acceleration electrode means 20 and the metal back layer 19 to form the phosphor layer. 18 and is displayed on the display board.

(Problems to be Solved by the Invention) However, in such a structure, since a high voltage is applied to the support 23, the electric field strength in the vicinity changes strongly and rapidly. The electron beam deflected by the deflection electrode means 14 of No. 2 does not reach the entire surface of the display panel uniformly and is distorted near the support, causing a positional shift in the landing of the electron beam, resulting in lines appearing on the screen. There was a point of reference that I could see.

FIG. 7 is an enlarged view of the main parts of a conventional display device.

That is, as shown in FIG. 7, the second deflection electrode means 14 has a constant inter-electrode pitch P over the entire deflection electrode means,
Since it is constituted by the electrode piece 15 and the electron beam passage slit 25 having a uniform slit width W, the deflection sensitivity of the second deflection electrode means near the support and the other places are the same and the pitch of each deflection electrode is the same. As a result, the electron beam is excessively deflected toward the support due to the strong electric field near the support, and the deflection sensitivity decreases where the supports intersect.

On the support side, it is distorted into a barrel shape.

(Means for Solving the Problems) The technical means of the present invention for solving the above problems is to correct the landing of the electron beam near the support to obtain a uniform display. A deflection correction electrode is provided between the opposing deflection electrodes and at a position facing the support.

(Function) If this is done, the electron beam will be excessively deflected toward the support due to the high voltage of the support near the support, and the deflection provided at a position facing the support between the support and the deflection electrode will be prevented. By applying a voltage to the correction electrode that prevents the electron beam from being drawn toward the support (lower voltage than the potential at that position when there is no deflection correction electrode), the electron beam is prevented from being drawn toward the support. This ensures uniform landing of the electron beam near the support.

(Embodiment) An embodiment of the present invention will be described below in detail based on the accompanying drawings.

This embodiment is constructed by providing a deflection correction electrode between the second deflection electrode means 14 and the support 23 in the conventional display device shown in FIG.

FIG. 1 is an enlarged top view of a main part of a first embodiment showing the structure of a display device of the present invention, in which a deflection correction electrode 25 is provided between a support 23 and a second deflection electrode means 14. .

The thickness t of the support is 200μ■, and the width W of the deflection correction electrode is 3
00 μm. A high voltage of 10 KV is applied to the support body 23 and the display plate 16, and 10 KV to IKV is applied to the accelerating electrode 20. At that time, a voltage of 200 to 700V is applied to the electrode piece 15 of the second deflection means 14, and the deflection correction electrode 2
5, a voltage of 100 to 600v was applied.

Furthermore, the position of the deflection correction electrode between the second deflection means 14 and the display panel 16 is closer to the second deflection means, even if the same voltage is applied to the deflection correction electrode, the effect is greater. Ta.

Further, even if the distance between the deflection electrodes was closer than the pitch P, the effect did not increase. In other words, this is because the potential distribution due to the deflection electrode has become the main component. Therefore, it is not effective to provide the deflection correction electrodes too close to the second deflection means, so it is necessary to appropriately determine the pitch P between the deflection electrodes and the width W of the deflection correction electrodes.

FIG. 2 is an enlarged side view of essential parts of the first embodiment of the display device of the present invention, and 14 is a second deflection electrode means.

15 is an electrode piece, 16 is a display plate, 20 is an acceleration electrode, 23 is a support body, and 25 is a deflection correction electrode.

The distance 11 between the display plate 16 and the second deflection electrode means 14 is 10
(2) The distance I2 between the second deflection electrode means 14 and the deflection correction electrode 25 was 2 mm, and the height of the support was 3 mm.

When an image was displayed using the apparatus configured as described above, the landing of the electron beam near the support was improved, the deflection characteristics on the support side were sufficiently uniform, and the image quality was improved.

FIG. 3 is an enlarged top view of main parts of a second embodiment of the present invention, and 26 is a deflection correction electrode.

In this case, the electrode width of the deflection correction electrode 26 is made wider at a position where the electrode 26 does not intersect with the support 23 than at a position where the electrode 26 intersects with the support 23 .

As a result, the deflection correction electrode 26 can reduce the deflection sensitivity of the electron beam near the point where the supports intersect.
The structure of the structure is corrected by strengthening the correction effect at the positions where the supports 23 intersect and opposite positions, so that it is possible to correct the landing of the electron beam in the vicinity where the supports 23 intersect. Became. Therefore, the uniformity of the landing of the electron beam near the support was also improved.

FIG. 4 is an enlarged top view of the main parts of the third embodiment of the present invention.
7 is a deflection correction electrode arranged in a rectangular shape.

By doing this, not only the strength of the deflection correction electrode itself becomes strong, but also correction can be made in both the X direction and the Y direction, and uniformity can be obtained over the entire display surface.

(Effects of the Invention) As explained above, in the first embodiment of the present invention, the electron beam is prevented from being excessively deflected toward the support near the support, and the landing of the electron beam is uniform. A good display quality image was obtained.

In the second embodiment, distortion of the landing of the electron beam is eliminated, especially near where the supports intersect;
The uniformity of the landing of the electron beam was improved, and a display device with good display quality was obtained.

In the third embodiment, by assembling the deflection correction electrodes in a rectangular shape, the strength of the deflection correction electrodes themselves is strong.
It is now possible to correct deflection in both Y directions, increasing the uniformity of the electron beam landing across one screen.

Further, by making the width of the deflection correction electrode wider than the thickness of the support, the above effect was further improved.

[Brief explanation of the drawing]

FIG. 1 is an enlarged top view of essential parts of a first embodiment showing the configuration of a display device of the present invention, FIG. 2 is an enlarged side view of essential parts of the first embodiment of a display device of the present invention, and FIG. 4 is an enlarged top view of essential parts of the second embodiment of the present invention, FIG. 5 is an enlarged top view of essential parts of the third embodiment of the present invention, FIG. 5 is a perspective view of a conventional display device, and FIG.
The figure is a side sectional view of a conventional display device, and FIG. 7 is an enlarged view of main parts of the conventional display device. 1... Metal plate, 2... Back electrode, 2a... Insulating plate. 2b...metal film, 3-...linear hot cathode, 4...first
Grid electrode, 4a... slit-like through hole, 5... first
Deflection electrode means, 6... a pair of electrode substrates, 7... deflection electrode, 8... second grid electrode. 9...Third grid electrode, 10...Electron beam modulation electrode, 11...Electron beam control electrode means, 12, 13...
...Slit-shaped through hole, 14...Second deflection electrode means, 15...Electrode piece, 1
6... Display board, 17... Envelope, 18... Phosphor layer. 19... Metal back layer, 20... Accelerating electrode. i 21... accelerating electrode substrate, 22.
...Striped electrode. 23... Support body, 24... Spacer, 25.26,
27... Deflection correction electrode. Patent applicant: Matsushita Electric Industrial Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (6)

[Claims] (1) An electron source, an extraction means for taking out an electron beam from the electron source, a deflection means for deflecting the electron beam, a display means that emits light by collision of the electron beam, and at least the electron source and the It has a support for supporting the take-out means and the deflection means on the display means, and a deflection correction electrode is provided on the support between the support and the opposing deflection means. Display device. (2) The display device according to claim (1), wherein the deflection correction electrode is formed of a striped electrode. (3) Claims (1) or (2), characterized in that the width of the deflection correction electrode is wider at a location where the supports do not intersect than at a location where they do not intersect. Display device as described. (4) A display device according to claim (1), (2) or (3), characterized in that the deflection correction electrode is square-shaped. (5) Claims (1), (2), (3), or (4), characterized in that the width of the deflection correction electrode is wider than the thickness t of the support. Display device as described. (6) Claims (1) and (2), characterized in that the deflection correction electrode is provided closer to the deflection means between the deflection means and the support, which face the support. , the display device according to item (3), item (4), or item (5).