JPS6391937A - Flat plate type image display device - Google Patents

Abstract

PURPOSE:To decrease a resistance value of vertical scanning electrodes so as to sufficiently promote the function of this device by forming the vertical scanning electrodes into metallic plates separated in parallel when a grid electrode, a linear hot electrode, and the vertical scanning electrodes are disposed in the order of them on the side of a luminous layer formed on a face plate. CONSTITUTION:A grid electrode 10 for electron beam induction, linear hot cathodes 7 disposed at prescribed intervals in the H direction, and vertical scanning electrodes 8 serving as rear electrodes supported by an insulating susceptor 9 are installed in the order of them on the side of a luminous layer 12 formed on an inner surface of a face plate 11 in order to form a flat plate type image display. In this composition, the vertical scanning electrodes 8 are formed into electrodes 8a, 8b, 8c of metallic plates which are combined at prescribed intervals in the V direction. Thus the vertical scanning electrodes 8 by which electron beams are made to advance to the luminous layer 12 become extremely small in their resistance values, and a RC time constant becomes small so that responsibility of electrode potentials is upgraded and also a change in wave forms is made small.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flat panel image display device used in color television receivers, computer terminal displays, and the like.

2. Description of the Related Art An example of a conventional flat panel image display device will be described below with reference to the drawings.

FIG. 2 shows the main structure of a conventional flat panel image display device. In FIG. 2A, 1 is a linear hot cathode, 2 is a vertical scanning electrode formed on an insulating support 3, and is generally formed by vapor depositing indium oxide. Reference numeral 4 denotes a grid electrode for extracting the electron beam, and a light emitting layer 6 made of a fluorescent material is formed on the inner surface of the face plate 5, and a space between the grid electrode 4 and the light emitting layer 6 serves to focus the electron beam in the horizontal direction. Although electrodes for obtaining the same and horizontal deflection electrodes are actually inserted, they are omitted in FIG. 2A. In reality, each electrode is housed in a vacuum envelope, but this is omitted in FIG. 2A.

The operation of the flat panel image display device configured as described above will be described below. First, an electron beam generated by heating the linear hot cathode 1 advances to the light emitting layer 6 as an electron beam due to the potential given by the grid electrode 4 and the vertical scanning electrode 2.
The second pulse signal is used to turn on and off the electronic beam so that scanning is performed sequentially from the top to the bottom of the screen.
The voltages are applied as 2a, 2b, 2c, . . . shown in Figure B.

Problems to be Solved by the Invention In such a conventional configuration, when manufacturing a large-sized display device, the resistance value R of the vertical scanning electrode becomes high, and the resistance value R of the vertical scanning electrode becomes high as shown in FIG. Similarly, since the potential of the vertical scanning electrode greatly changes from the applied voltage waveform, there has been a problem in that the vertical scanning electrode cannot fully perform its function.

The present invention solves the above-mentioned problems and provides a flat panel image display device capable of fully demonstrating the functions of vertical scanning electrodes.

Means for Solving the Problems The flat panel image display device of the present invention includes a linear electron source, an electron beam extraction means for extracting an electron beam from the electron source, and an electron beam extraction means for the linear electron source. a back electrode means for controlling the electron beam provided on the opposite side, and a light emitting means for emitting light upon impact of the electron beam), at least a part of the back electrode means being composed of a metal plate. ing.

Operation With the above configuration of the present invention, the resistance value of the vertical scanning electrode becomes extremely low, and therefore the RC time constant can be kept low, and the voltage waveform applied to the vertical scanning electrode hardly changes and its function is fully maintained. can demonstrate.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings. FIG. 1A shows the main structure of a flat panel image display device according to an embodiment of the present invention. ■In Figure 1 A, 7 is a linear hot cathode, 8! -i A vertical scanning electrode formed on an insulating support 9 and composed of a metal plate. Reference numeral 10 denotes a grid electrode for extracting electron beams, and a light emitting layer 12 made of a fluorescent material is formed on the inner surface of the face plate 11.

In reality, each electrode is housed in a vacuum envelope, and between the grid electrode 1o and the light emitting layer,
Electrodes for horizontally focusing the electron beam, horizontal deflection electrodes, and the like are inserted, but are omitted in the figure.

The operation of the flat panel image display device configured as described above will be described below. First, an electron beam generated by heating the linear hot cathode 7 advances to the light-emitting layer 12 as an electron beam due to the potential given by the grid electrode 10 and the vertical scanning electrode 8. At this time, the vertical scanning electrodes 8 are connected to pulse signals 8a, 8b, 8c, . . . , which turn the electron beams ON and OFF so that scanning is performed sequentially from the top to the bottom of the screen, as shown in FIG. 1B. It is applied as follows.

In the above state, since the vertical scanning electrode 8 is made of a metal plate, the resistance value R of the vertical scanning electrode 8 becomes much lower than that in the conventional case, and the time constant of RC is kept small. As a result, the potential of the vertical scanning electrode 8 shows a quick response to the applied voltage, and changes in the waveform are kept small.

Effects of the Invention As described above, in the present invention, by using a metal plate as the back electrode means of a flat panel image display device, the function of the back electrode means can be fully exhibited.

[Brief explanation of the drawing]

1A and 1B are respectively a perspective view and a waveform diagram showing an example of the main part configuration of a flat panel image display device according to an embodiment of the present invention, and FIGS. 2A and 2B are respectively a diagram of a conventional flat panel image display device. FIG. 2 is a perspective view and a waveform diagram showing the configuration of main parts of the device. 1.7... Linear hot cathode, 2,8... Vertical scanning electrode, 3,9... Insulating support, 4,1o
・・・・・・Grino）”l, 5, 1 j・・・・・・
Face plate, 6, 12... Light emitting layer. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure (A) Figure 2

Claims (1)

[Claims] A linear electron source, an electron beam extraction means for extracting an electron beam from the electron source, and a back electrode for controlling the electron beam provided on a side opposite to the electron beam extraction means with respect to the linear electron source. and a light emitting means that emits light upon impact of the electron beam, wherein at least a part of the back electrode means is made of a metal plate.