KR940009190B1 - Flat image display device - Google Patents

Abstract

The flat panel image display device includes a front plate under which an anode is formed, a back plate opposite to the front plate, on which a plurality of cathodes are formed, a first control electrode formed on the back plate, and a second control electrode formed on the front plate, the first and second control electrodes being intersected to each other, and an insulating layer having a contact hole formed on the intersection, and a guide plate having a guide hole corresponding to the contact hole is provided between the front and back plates.

Description

Flat Image Display

1 is a perspective view schematically showing a conventional flat image display device.

2 is a perspective view schematically showing a flat image display device of the present invention;

3 is a schematic cross-sectional view of FIG.

4A and 4B show a supporting state of the cathode ray of the present invention.

5 is an excerpt of an essential part of a flat image display device according to the present invention.

* Explanation of symbols for main parts of the drawings

20: front panel 40: guide plate

21: fluorescent film 50: insulating substrate

22: anode 51: first control electrode

30: back plate 52: second control electrode

33: cathode ray 60: partition wall

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat image display device, and more particularly, to a flat image display device whose structure is improved to be suitable for a large display device.

Conventionally, as shown in FIG. 1, a fluorescent film 3 is provided on the bottom surface of the front plate 1 to display an image by emitting a specific portion by collision of hot electrons or ions, and a predetermined distance from the front plate 1. It is held between the front plate (2) and the front plate (1) and the back plate (2) provided with a cathode electrode portion 10 on the upper surface thereof and extends in one direction on the lower surface thereof to form a plurality of parallel electrodes. A first control electrode 7 is formed, and a second control electrode 5 is formed on the upper surface thereof in a direction perpendicular to the first control electrode 7, and the first control electrode 7 and the second control electrode 5 are formed. And an insulating substrate 6 having a through hole 4 through which hot electrons or ions pass, and provided between the insulating substrate 6 and the back plate 2, and the first control electrode 7 A cathode ray 9 provided in the same direction and emitting hot electrons, and a grid-shaped acceleration electrode 8 provided above the cathode ray 9 to accelerate and control the hot electrons; It was formed by having. However, the above-described flat image display apparatus requires a vacuum space therein, so that the front plate 1 and the back plate 2 should be formed thick so as to be stable to impact in response to the degree of vacuum. As a result, the light transmittance This lowers and the brightness lowers. In addition, the cathode 9 that emits electrons has a problem that when the large display device is required, its support interval is far, so that it is difficult to maintain the tension, and thus the luminance difference is generated between adjacent pixels due to the bending of the cathode 9.

The present invention has been made to solve the above problems, and even with a uniform brightness, it is possible to overcome the atmospheric pressure due to the internal vacuum even when using a thin front panel and a rear panel which emit light with increased luminance and have a large thickness. It is an object of the present invention to provide a flat image display device having a structure that can be used.

In order to achieve the above object, the present invention provides a front plate having an anode formed on a lower surface thereof, and a back plate provided with a plurality of cathode rays provided with a plurality of parallel electrodes facing the front plate, the electrons being emitted to a plurality of parallel electrodes thereon. And an insulating substrate provided between the front plate and the rear plate and provided with a second control electrode and a first control electrode in directions perpendicular to each other on upper and lower surfaces thereof, the insulating substrate having through-holes through which electrons pass through the intersections thereof. In the image display apparatus, the guide plate is provided in close contact with the front plate and the insulating substrate and is provided with an electromagnetic through guide hole corresponding to the through hole.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is an exploded perspective view schematically showing the flat image display device of the present invention, and FIG. 3 is a cross-sectional view of the flat image display device of FIG. 4a and b show various embodiments in which the cathode ray is supported and arranged. This is provided with a front plate 20 having a fluorescent film 21 and an anode 22 formed on the bottom surface and a predetermined interval maintained with the front plate 20, and a back plate 30 having a back electrode 31 formed on an upper surface thereof. And a plurality of cathode rays 33 provided on a plurality of parallel electrodes provided on the rear electrode 31 and supported by the supporters 32 arranged at regular intervals to emit electrons, and above the cathode rays 33. A first control electrode 51 is formed on the bottom thereof to control the scan signal with a plurality of parallel electrodes, and a video data signal is formed on the top surface in a direction orthogonal to the first control electrode 51 with the plurality of parallel electrodes. And an insulating substrate 50 having a through hole 50a through which the electrons pass at the intersections of the first and second control electrodes 51 and 52. The plurality of cathode rays 33 may be maintained between the insulating substrate 50 and the back plate 30 at a predetermined interval. A plurality of barrier ribs 60 are arranged in parallel with the cathode rays to contain a predetermined number of cathode rays and close to each other between the insulating substrate 50 and the anode 22. And a guide plate 40 having an electron passing guide hole 40a communicating with the through hole 50a.

In this case, the cathode ray 33 is supported by placing the supporter 32 at an appropriate interval of the cathode ray 33 so as to be advantageous to a large image display device. As shown in FIG. 33) may be connected and supported between the supporter 32 and the supporter 32, respectively, and shown in FIG. 4B for the discontinuous point of electron emission at the supporter portion A, which is the connection portion of the unit cathode ray 33. As described above, the supporter 32 may be supported so that a part of the unit cathode line 33 overlaps. In addition, in order to accelerate electrons emitted from the cathode ray 33, a grid-shaped acceleration electrode 34 is provided on the cathode ray 33. Here, the total number of terminals input to the first control electrode 51 for controlling the scan electrode from the outside is smaller than the total scan bow of the display as shown in FIG. 5, and the control electrodes in each scan group are adjacent to each other. The control electrodes in another scan group are connected to each other in a one-to-one correspondence so that a plurality of control electrodes are selected when a scan signal is applied to one input terminal. At this time, the acceleration electrodes 34 positioned between the cathode ray 33 and the first control electrode 51 are divided and sequentially driven for each scan group. Reference numeral 31 is a negative voltage is applied to the back electrode. 51a is a wiring for the first control electrode 51 and 51b is a wiring for the first control electrode 51 arranged on the surface of the second control electrode 52.

The operation of the flat image display device according to the present invention configured as described above is as follows.

As shown in FIG. 3, when a voltage is applied to the cathode rays 33 corresponding to the primary scan group 33a, the cathode ray in the primary scan group 33a is input until the first video signal is input by the voltage. 33) are sufficiently warmed up to an optimal electron emission state. The hot electrons that are sufficiently preheated in this way are accelerated by the acceleration electrode 34 to reach the insulating substrate 50 having the through holes 50a through which the electrons pass. The hot electrons are formed on the upper and lower surfaces of the insulating substrate 50. The hot electron guide hole 40a formed in the guide plate 40 is selectively passed through the electron through hole 50a depending on whether the first control electrode 51 and the second control electrode 52 have a potential. Guided along the landing to the fluorescent film 21 of the front plate 20 to form a screen. At this time, the cathode rays 33 in the secondary scan group 33b are preheated by applying a voltage before or after the first video signal is input, so that the electrons are emitted, and the electrons are emitted in the first scan group 33b. Since the control electrode 51 is not selected, it does not affect the screen display, and since the cathode rays 33 in the third scan group 33c do not generate heat, the third scan group 33c is selected for the first control electrode 51. Even though the electrons do not collide on the screen Therefore, the cathode rays 33 in each scan group 33a to 33c participate in image display after securing sufficient preheating time.

In the flat image display device according to the present invention, since the cathode ray 33 is supported by the plurality of supporters 32, it is possible to maintain a constant tension without sagging, so that the anode 22 and the first and second control electrodes 51 ( 52, an image of uniform brightness is obtained with a constant potential difference with the cameras. By arranging the first control electrodes 51 as shown in FIG. 5, the scanning lines can be controlled even by using only one scanning electrode control IC. In addition, a plurality of partition walls are formed between the front plate 20 and the insulating substrate 50 through the guide plate 40 having the electronic guide hole 40a formed therebetween, and between the insulating substrate 50 and the back plate 30. Since the front plate 20 and the back plate 30 can be thinly formed by structurally stable to the internal vacuum by maintaining the temperature at 60, unlike the conventional case in which the front plate and the back plate are thickly formed by vacuuming the inside, The invention makes it possible to display an image with uniform brightness and improved brightness.

In the flat image display device according to the present invention, since the cathode ray 33 is supported by the plurality of supporters 32, it is possible to maintain a constant tension without sagging, so that the anode 22 and the first and second control electrodes 51 ( 52, an image of uniform brightness is obtained with a constant potential difference with the cameras. By arranging the first control electrodes 51 as shown in FIG. 5, the scanning lines can be controlled even by using only one scanning electrode control IC. In addition, a plurality of partition walls are formed between the front plate 20 and the insulating substrate 50 through the guide plate 40 having the electronic guide hole 40a formed therebetween, and between the insulating substrate 50 and the back plate 30. Since the front plate 20 and the back plate 30 can be thinly formed by structurally stable to the internal vacuum by maintaining the temperature at 60, unlike the conventional case in which the front plate and the back plate are thickly formed by vacuuming the inside, The invention makes it possible to display an image with uniform brightness and improved brightness.

Claims (4)

It is provided between the front plate and the back plate provided with a front plate having an anode formed on the lower surface, a plurality of cathode wires provided opposite to the front plate at a predetermined interval and the electrons are emitted to the plurality of parallel electrodes on the upper surface. And an insulating substrate having a second control electrode and a first control electrode formed in a direction perpendicular to each other on the upper and lower surfaces thereof, and having a through hole through which electrons pass at an intersection thereof. 20) and a guide plate (40) provided in close contact with the insulating substrate (50) and having an electromagnetic through guide hole (40a) corresponding to the through hole (50a). The flat panel image display apparatus according to claim 1, wherein a partition wall (60) for maintaining a constant distance from the insulating substrate (50) on the back plate (30) is provided in parallel with the cathode ray (33). The flat image display device according to claim 1 or 2, wherein a support (32) for supporting the cathode ray (33) is formed on the rear plate (30). The planar image display according to claim 1 or 2, wherein an accelerating electrode (34) for accelerating electrons emitted from the cathode (33) is provided in a space between the cathode (33) and the insulating substrate (50). Device.