JP2765853B2 - Flat display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display used for a television receiver, a terminal of various electronic computers, and the like, and particularly to a flat display capable of reducing the thickness of the device. (Prior Art) As such a flat panel display, an apparatus as shown in FIG. 4 has been proposed (Japanese Patent Laid-Open No. 61-242489).

[H04N9 /
22]). The device comprises a back electrode (91), a plurality of linear cathodes (92), a vertical focusing electrode (93),
A vertical deflection electrode (94), a beam current control electrode (95), a horizontal focusing electrode (96), a horizontal deflection electrode (97), a beam accelerating electrode (98), and a screen (99). These are accommodated in a flat glass tube (not shown). In the display, each line cathode (9
A plurality of electron beams (100) are emitted from 2), and each electron beam (100) is vertically deflected by a vertical deflection electrode (94) and then horizontally deflected by a horizontal deflection electrode (97). Then, scanning is performed within a predetermined divided area (101) of the phosphor screen. (Problems to be Solved) However, in the above display, it is inevitable that a variation in shape and a temperature difference occur between the plurality of linear cathodes (92). (Electron amount).
Further, in order to deflect each electron beam in a predetermined direction, a large number of horizontal and vertical deflection electrodes are required, resulting in a problem that the apparatus becomes extremely complicated. SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems at once by employing a planar cathode as an electron beam source. (Problem to be Solved) A flat panel display according to the present invention includes a heater plate (3) having a heat radiating surface corresponding to a phosphor screen of a front panel;
A plurality of row electrodes (4) repeatedly formed on the heat radiating surface of the heater plate (3) and a plurality of row electrodes (4) formed on the heat radiating surface of the heater plate (3) so as to cover the entirety. A single planar cathode (5), a control plate (7) arranged at a predetermined distance from the planar cathode (5), and a row electrode (4) on one surface of the control plate (7). ) And a plurality of column electrodes (6) repeatedly formed orthogonally. In each of the electrode strips (61) of the column electrode (6), a large number of apertures (62) are opened in a row in accordance with the pixel pitch. The control plate (7) includes the column electrode (6).
A large number of apertures (71) are opened corresponding to the respective apertures (62). (Function) By energizing the heater plate (3), the planar cathode (5) is uniformly heated. Then, by applying a control voltage to the row electrode (4) and the column electrode (6) while the planar cathode (5) is heated, thermionic electrons are emitted from the planar cathode (5). The electrons are supplied to the aperture (62) of the column electrode (6) and the control plate (7).
Pass through the aperture (71) to become an electron beam having a predetermined diameter, and irradiate each pixel on the phosphor screen. (Effects of the Invention) In the flat panel display according to the present invention, each pixel constituting the phosphor screen and each aperture provided in the column electrode (6) and the control plate (7) have a one-to-one correspondence. And
Therefore, since each pixel corresponds to the emission point of the electron beam on a one-to-one basis, an electron beam deflecting device is not required, and the configuration of the device is extremely simplified. An electron beam deflecting device becomes unnecessary, and the device configuration becomes extremely simple. Further, since the cathode (5), which is an electron beam source, is formed in a single plane covering the whole of the plurality of row electrodes (4), the plane cathode (5) is energized by the heater plate (3). Heated uniformly. Therefore, the electron quantity of each electron beam does not vary due to temperature. (Embodiment) FIG. 1 shows a schematic configuration of a display panel in which a flat panel display according to the present invention is implemented, and FIG. 2 shows an enlarged detailed structure of the display panel. A flat vacuum container is formed by the glass panels (2), (21), (22), and (83), and a heater plate (3), a column electrode (6), and a control plate (7), which will be described later, are formed in the container.
And so on. The heater plate (3) is configured by embedding a heater inside a ceramic plate, for example, and is mounted on the glass panel (2) on the rear side via a spacer (11). A large number of electrode strips (41) extending in the horizontal direction are provided at a constant pitch (for example, 0.2 to
0.3 mm) to form a row electrode (4). The row electrodes (4) can be formed by metal deposition or printing. Further, barium carbonate is applied to the heat radiating surface of the heater plate (3) so as to cover the entire plurality of row electrodes (4), thereby forming a planar cathode (5). The planar cathode (5) can also be formed by printing barium carbonate. A control plate (7) is provided between the planar cathode (5) and a space (10) having a thickness of about 100 μm. On the back surface of the control plate (7), that is, the surface facing the planar cathode (5), a large number of electrode strips (61) orthogonal to the row electrodes (4).
Are formed at a constant pitch (for example, 0.2 to 0.3 mm), thereby forming a column electrode (6). A large number of apertures (62) are formed in a row in each electrode strip (61) of the column electrode (6), corresponding to the intersection of the row electrode (4) with the electrode strip (41). The inner diameter of the aperture (62) is approximately 0.1-0.2mm
It is. Similarly to the row electrode (4), the column electrode (6) can be formed by metal deposition or the like. The control plate (7) is formed of an insulating plate made of glass, alumina or the like, and has a large number of apertures (71) corresponding to the apertures (62) of the column electrode (6) in a matrix shape. The surface of the control plate (7) is connected to the front panel (8) via a spacer (12) made of an insulating material. The front panel part (8) has three primary color fluorescent stripes (83) formed at a constant pitch on the inner surface of a glass panel (84) which is a part of the vacuum vessel. Black stripes (82) are interposed. The pitch at which the fluorescent stripes (83) are formed depends on the column electrode (6).
Of the electrode strip (61). The surface of the fluorescent screen formed by the fluorescent stripes (83) and the black stripes (82) is provided with an aluminum metal back, thereby forming an acceleration electrode (81). After energizing the heater plate (3), predetermined electrode strips (41) of the row electrodes (4) and predetermined electrode strips (6) of the column electrodes (6) are applied.
A voltage of +50 V to +100 V according to the video signal is applied between 1) and a voltage of, for example, 1 KV is applied to the accelerating electrode (81). Due to the potential difference therebetween, thermoelectrons are emitted from the surface of the planar cathode (5), and the electron current passes through apertures (62) (71) located at the intersection of the two electrode strips (41) (61). Into an electron beam. The electron beam is accelerated by the acceleration electrode (81) and irradiates a predetermined pixel on the phosphor screen. FIG. 3 shows a circuit configuration for driving the display panel (1). The row electrode and the column electrode of the display panel (1)
Row electrode driver (13) and column electrode driver (1
4) is connected, and a drive voltage according to the video signal is applied by the operation of both drivers (13) and (14). The controller (16) controls the row electrode driver (13) and the column electrode driver (14) based on the red, green, and blue color signals sent through the video signal processing circuit (15). Is created and supplied to each driver (13) (14). According to the above-mentioned flat display, an electron beam deflecting device is not required, so that an ultra-thin display panel can be formed as compared with the size of the screen, and the electron beam can be made uniform over the entire screen. Therefore, faithful image reproduction can be performed. The configuration of each part of the present invention is not limited to the above embodiment, and various modifications are possible within the technical scope described in the claims, and the present invention can be applied to, for example, a black and white television. Also, the column electrode (6) may be formed on any surface of the control plate (7).

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a schematic configuration of a flat panel display according to the present invention, FIG. 2 is an enlarged perspective view of a partially broken display panel, FIG. 3 is a block diagram of a drive circuit, and FIG. FIG. (1) Display panel (83) Fluorescent stripe (3) Heater plate (4) Row electrode (5) Planar cathode (6) Column electrode (7) ... control plate, (71) ... aperture

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazuhiko Takeuchi 2-18-18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Tetsuya Enomoto 2-18-18 Keihanhondori, Moriguchi-shi, Osaka (56) References JP-A-62-170135 (JP, A) JP-B-57-33663 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01J 31 / 12-31/15 H01J 29/04

Claims (1)

(57) [Claims] 1. A display for projecting an image on a front panel by irradiating an electron beam to a phosphor screen formed on an inner surface of a front panel, the heater plate having a heat radiating surface corresponding to the phosphor screen. A plurality of row electrodes (4) repeatedly formed on the heat radiating surface of the heater plate (3), and a plurality of row electrodes (4) formed on the heat radiating surface of the heater plate (3) so as to entirely cover the plurality of row electrodes (4). A single planar cathode (5), a control plate (7) disposed at a predetermined distance from the planar cathode (5), and the control plate (7).
And a plurality of column electrodes (6) repeatedly formed orthogonally to the row electrode (4) on one surface, and each of the column electrodes (61) of the column electrode (6) has: A large number of apertures (62) are opened in a row in accordance with the pixel pitch, and the control plate (7) has a large number of apertures (71) corresponding to the respective apertures (62) of the column electrodes (6).
A flat-panel display characterized by the fact that it has been established.