JPH07105882A - Image display device - Google Patents

Abstract

PURPOSE:To provide an image display device using a linear cathode in which the vibration of the linear cathode is sufficiently prevented even when a vibration is propagated to the image display device, and an unevenness of display is never caused. CONSTITUTION:One or a plurality of structures 10 in which a linear cathode 2 is extended through a hole formed in a position (eccentric position) off-centered from the center of gravity are set on both end parts of the linear cathode 2 excluding the part corresponding to a display screen. A resistor 11 capable of absorbing the vibration energy of the linear cathode 2 by the structure 10 regularly making contact therewith regardless of the setting state of an image display device while holding also the position regulating action of the structure 10 is mounted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat type image display device used for a television receiver, a display for a computer terminal or the like.

[0002]

2. Description of the Related Art In recent years, a cathode ray tube has been widely used as an image display device. The cathode ray tube is very excellent in display characteristics such as brightness, contrast or color reproducibility of the display screen. However, the cathode ray tube has a very long depth due to its structure, and requires a large space for installation.

On the other hand, some thin image display devices, such as liquid crystal display devices, which have realized space saving have been developed, but none of them have sufficient display characteristics.

On the other hand, based on the idea of arranging extremely small cathode ray tubes in a matrix without gaps in order to realize a thin display while obtaining display characteristics comparable to those of cathode ray tubes.
2. Description of the Related Art There is an image display device in which each section of a display screen divided into small sections is scanned with an electron beam to form an image as a whole.

An example of the above-mentioned conventional image display device will be described below with reference to the drawings.

FIG. 4 shows the structure of a conventional image display device. In FIG. 4, 1 is a back electrode and 2 is a line cathode, which serves as an electron beam source. 3 is a control electrode group, 4 is a phosphor, 5 is a front container whose bottom surface is a display screen, and 6 is a back container. The back electrode 1, the line cathode 2, the control electrode group 3, and the phosphor 4 are sandwiched between the front container 5 and the back container 6, and after the front container 5 and the back container 6 are welded with, for example, molten glass, the inside of the container is Apply a vacuum.

FIG. 5 shows a structure in which the conventional image display device, particularly the line cathode 2, is stretched. In FIG. 5, 2 a to 2 d are line cathodes, 7 is a line cathode spring for applying tension to the line cathode 2, and 8 is a line cathode 2.
In the Y direction (direction perpendicular to the longitudinal direction of the line cathode 2 on a plane parallel to the back electrode 1), 9 is the height of the line cathode 2 (that is, the gap between the back electrode 1 and the line cathode 8)
Restriction plates 10a to 10d are eccentric rings for preventing the vibration of the line cathode 2, 11 is a restriction fitting for restricting the position of the eccentric ring 10, 11a is on the restriction fitting 11 and is a clearance from the eccentric ring 10. It is a restriction hole into which the eccentric ring 10 provided with is inserted.

The operation of the image display device configured as described above will be described below.

First, a predetermined current is applied to the line cathode 2,
The temperature is raised so that the line cathode 2 can easily emit electrons.
Next, a predetermined voltage is applied to the back electrode 1 and the control electrode group 3, and the electrons emitted from the line cathode 2 are extracted to the control electrode group 3 side.

At this time, the most linear cathode 2 of the control electrode group 3
Micro-holes are formed in a matrix form at a position corresponding to the line cathode 2 as shown in FIG. 4 in a matrix shape at a position near the electrodes, and only the electrons passing through these micro-holes are intermittently connected in the control electrode group 3. Are drawn out to form a current of electrons. The obtained electron flow passes through the control electrode group 3 while undergoing the focusing action and the deflecting action by the electrostatic lens formed by the control electrode group 3.

Further, by applying a high voltage (for example, 13 kV) to a metal back (not shown) formed on the upper surface of the phosphor, the electrons passing through the control electrode group 3 are accelerated and collided with the phosphor 4, and this collision part The phosphor 4 emits light. The light emission phenomenon as described above is performed on the entire display screen to form an image.

When the line cathode 2 starts to vibrate due to an impact from the outside of the image display device or a vibration from a speaker mounted on the image display device, the eccentric ring 10 installed on the line cathode 2 is started. Also starts to vibrate.

In this way, the vibration energy of the line cathode 2 is converted into the kinetic energy of the eccentric ring 10 and is diverged to the restriction fitting 11 by the contact between the restriction hole 11a and the eccentric ring 10, so that the vibration of the line cathode 2 is reduced ( See, for example, JP-A-3-184247).

[0014]

However, in the above structure, when the wire cathode vibrates, the eccentric ring that has been conventionally attached cannot sufficiently prevent the vibration. As a result, sufficient image quality could not be obtained.

The eccentric ring and the restriction hole are in contact with each other, and the vibration energy is absorbed by the restriction metal fitting. The clearance is provided between the eccentric ring and the restriction hole. Can't be in contact.

Therefore, since the vibration of the eccentric ring vibrating together with the line cathode cannot be reduced, there is a problem that the image display becomes non-uniform.

In view of the above problems, the present invention provides an image display device that sufficiently prevents the line cathode from vibrating even when vibration propagates to the image display device and does not cause non-uniformity in display.

[0018]

In order to solve the above-mentioned problems, the image display device of the present invention has a hole formed at a position deviated from the center of gravity at both ends of the line cathode except the part corresponding to the display screen. One or a plurality of structures through which the line cathode penetrates are installed, and the structures always come into contact with each other regardless of the installed state of the image display device while also functioning as a position regulating function of the structures, and absorb vibration energy. It has a structure in which a resistor that can be used is attached.

[0019]

According to the present invention, when the line cathode vibrates, the structure vibrating together with the line cathode always keeps contact with the resistor, and the vibration energy of the line cathode is absorbed by the resistor through the structure. This has the function of reducing the vibration of the line cathode.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An image display apparatus according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a structure of a stretched portion of a line cathode of an image display device according to an embodiment of the present invention, in which 1 is a back electrode, 2a to 2d are linear cathodes, 7 is a stretched linear cathode spring, and 8 Is a Y-direction positioning frame body, 9 is a height control bar, 10i-10ni are eccentric rings,
Reference numeral 11 is a resistor that also functions as a position control of the eccentric ring 10, 20
Is an oblique restriction hole into which the eccentric ring 10 is inserted. As shown in FIG. 3, in the eccentric ring 10, a hole portion through which the linear cathode 2 penetrates is formed at a position deviated from the center of gravity thereof. Although only the structure of one end of the line cathode 2 is shown in FIG. 1, the other end has the same shape. Note that, although the back electrode 1 is drawn horizontally in FIG. 1, the back electrode 1 is used in a vertical state in an actual use state.

Next, FIGS. 2 and 3 are a plan view and a side view showing a state in which the eccentric ring 10 is in contact with the diagonal restricting hole 20 in FIG. 1, showing the positional relationship between the eccentric ring 10 and the oblique restricting hole 20. It is shown in an easy-to-understand manner.

In FIG. 1, the line cathode 2 is positioned by a Y-direction positioning frame body 8 and a height regulating bar 9. Each of the line cathodes 2a to 2d is stretched by applying a tension by the line cathode spring 7. At this time, the line cathodes 2 (2a, 2b, 2c, 2d) penetrate the holes of the eccentric ring 10 (10a, 10b, 10c, 10d) to suspend the eccentric ring 10.

Next, the eccentric ring 10 is inserted into the diagonal restricting hole 20 formed on the resistor 11. At this time, the eccentric ring 10 is always kept in contact with the edge of the oblique restriction hole 20 by the restoring force against the twisting action applied by the oblique restriction hole 20.

With respect to the image display device having the wire cathode straddling structure configured as described above, a case where an external impact or a vibration generated from a speaker attached to the image display device propagates inside the device will be described. .

When the vibration propagates to the image display device, the line cathode 2 starts to vibrate. When the line cathode 2 starts to vibrate, the eccentric ring 1 in which the line cathode 2 penetrates the hole
0 also starts to vibrate.

However, since the eccentric ring 10 is always in contact with the diagonal restricting hole 20, the vibration energy of the line cathode 2 is changed to the energy due to the contact friction between the eccentric ring 10 and the oblique restricting hole 20, and thus the line cathode 2 Since the vibration energy of is reduced, the vibration of the line cathode 2 is attenuated.

As described above, according to this embodiment, the restriction hole 2
Since the eccentric ring 10 always keeps contact with the resistor 11 by installing the resistor 11 in which 0 is provided obliquely, the vibration energy of the line cathode 2 is absorbed by the resistor 11 and the vibration energy decreases. The vibration of the line cathode 2 can be prevented.

[0028]

As described above, according to the present invention, even if the vibration propagates to the line cathode inside the image display device, the resistor provided with the regulation hole with which the eccentric ring hung on the line cathode is always in contact. As a result, it is possible to realize an image display device that reduces the vibration energy of the line cathode and realizes a uniform display.

[Brief description of drawings]

FIG. 1 is a partially exploded perspective view of a cathode stretch portion of an image display device according to an embodiment of the present invention.

FIG. 2 is a plan view showing a resistor in which an eccentric ring and an oblique regulation hole are formed in the same embodiment.

FIG. 3 is a side view of FIG.

FIG. 4 is a partial perspective view showing the configuration of a conventional image display device.

FIG. 5 is a partially exploded perspective view of a wire cathode stretch portion of a conventional image display device.

[Explanation of symbols]

 2 (2 a to 2 d) Wire cathode 10 (10 a to 10 d) Eccentric ring 11 Resistor 11a Regulation hole 20 Diagonal regulation hole

Claims (2)

[Claims] 1. A plurality of line cathodes, an electrode group for controlling an electron flow emitted from the line cathodes, and the electrode group which is on the opposite side of the line cathode and is parallel to the electrode group. In an image display device having a back electrode and an anode provided with a phosphor that emits light when an electron beam collides, both ends of the line cathode except the portion corresponding to the display screen have a position deviated from the center of gravity. An image display device comprising: a structure made of an insulating material in which the wire cathode penetrates a hole; and a resistor that is always in contact with the structure without being fixed. 2. The resistor is a thin plate formed with a substantially rectangular hole, and at least one side of the substantially rectangular hole is arranged so as not to be orthogonal to the extending direction of the line cathode. Item 1. The image display device according to item 1.