Matsushita Electric Industrial Co., Ltd.

Matsushita Electrical Industrial Co., Ltd.

Kaoru Tomii

Hiroshi Miyama

Yoshikazu Kawauchi

Jun Nishida

Akira Kaneko

Toru Kanno

Kiyoshi Hamada

Toshifumi Nakatani

Kinzo Nonomura

Tadao Kohashi

Fumio Yamazaki

Kiyoshi Saeki

Junpei Hashiguchi

Yoshihiro Hosokawa

An electron emission device is employed as an electron emission source in various applications using an electron beam. The electron emission device has a cathode layer having an edge, and a control electrode spaced and electrically insulated from the cathode layer, for drawing electrons from said edge of the cathode layer. When a voltage is applied between the cathode layer and the control electrode, a developed electric field is concentrated on the edge of the cathode layer to cause the edge to emit electrons. The electron emission device can easily be manufactured with a high yield since it does not have a needle tip for emitting electrons. A method of manufacturing the electron emission device is also disclosed.

Electron field emission device

In a flat configuration color display CRT in which one or more rows of electron beams are generated with the electron beams passing through respective apertures in successively disposed electrodes including horizontal deflection electrodes, apertures formed in an electrode positioned adjacent to the horizontal deflection electrodes have a central axis position displacement with respect to corresponding apertures of the horizontal deflection electrodes. A trajectory correction voltage which varies during each vertical scanning interval is applied to that adjacent electrode to execute dynamic adjustment of electron beam landing positions and thereby correct for an angular positioning error between a fluorescent layer pattern of the CRT and the electrode structure.

Flat configuration image display apparatus

An MIM type of electron emission element having a thin insulating film formed below an electron emission region of a metal layer, with that electron emission region of the metal layer consisting of an array of thick and thin portions, distributed throughout the electron emission region. Improved efficiency and uniformity of of emission are obtained, due to the low resistance of the thick portions, which apply a supply voltage to the thin portions of the metal layer, while the thin portions can be made sufficiently thin to maximize the electron emission.

MIM cold-cathode electron emission elements

An electron-emitting device including; electrical insulating substrates (1); an intermediate layer having a metal layer (2) and an insulating material layer (3) or having an insulating material layer (3), superposed in the thickness direction of said electrical insulating substrates (1) so as to be provided between said electrical insulating substrates (1) in the manner that it is recessed from one side surfaces of said electrical insulating substrates (1); a cathode material (4) provided at the middle portion of said intermediate layer, one end of said cathode material (4) protruding from the insulating material layer (3) that constitutes said intermediate layer; and a gate electrode (5) provided on said electrical insulating substrate (1) on the side where said intermediate layer is recessed.

Electron-emitting device and process for making the same

A flat configuration image display apparatus electron beam generator equipped with cold cathodes for generating a plurality of electron beams in response to image signals fed from an image signal supply circuit, and electron beam control electrodes for selectively energizing the cold cathodes of the electron beam generator in accordance with a scanning line selection signal. The electron beam generator is further equipped with at least an array of n base electrodes extending in vertical directions of a screen of the image display apparatus where n is an integer equal to or greater than 3, and a predetermined number of the cold cathodes are disposed on each of the base electrodes. The image signals are independently applied through terminal leaders to the base electrodes, the terminal leaders being led up to outsides of a vacuum housing of the image display apparatus. The electron control electrodes are divided into a plurality of groups each of which are responsive to the scanning line selection signal through a common bus.

Flat configuration image display apparatus and manufacturing method

A flat configuration CRT having positioned behind one or more line cathodes an array of control electrodes for electron beam modulation and shield electrodes for mutually shielding the control electrodes, in which the shield electrodes are connected as a plurality of electrically separate blocks. DC voltages applied to the respective blocks are adjusted such as to establish identical levels of beam current for electron beams which are generated by emission from the line cathodes, thereby enabling accuracy requirements for spacing between these electrodes and the line cathodes to be substantially reduced.

Flat configuration cathode ray tube

A flat panel type display provided with a screen, control electrodes divided in a horizontal direction of the screen, light emitting fluorescent material formed on the control electrodes, a mesh-like electrode, scanning electrodes each divided in a vertical direction of the screen and facing the mesh-like electrode, an electron source for generating electron beams in the horizontal direction of the screen and deflection unit for deflecting the beams in the vertical direction. The deflection unit is provided with a signal supply device for applying first and second voltage levels to each scanning electrode. The first voltage level is at a level similar to that applied to the control or mesh-like electrode. The second voltage level is substantially less than the first voltage level. The second voltage level is sequentially applied to each scanning electrode during a vertical scan, for a fixed time period at least as long as the time required for vertically scanning a distance in which a path of an electron reflected from a position of beam incidence with the fluorescent material becomes substantially parallel to the scanning electrodes. The time period between the start of each sequential application of the second voltage level to each successive scanning electrode is a predetermined amount which differs from the fixed time period of the second voltage level.

Flat panel type display and method for driving the display

An image display apparatus includes a flat configuration CRT which is provided with a second set of horizontal deflection electrodes in addition to the main horizontal deflection electrodes. A sawtooth waveform correction deflection voltage is applied to the second electrodes such as to slow the rate of electron beam scanning each time a portion of a fluorescent layer pattern of the screen is scanned, thereby increasing display brightness, while in addition the correction deflection voltage and the electron beam modulation signals are phase shifted by a mutually identical amount once in each scan line such as to compensate for a position deviation between the main horizontal deflection electrodes and the fluorescent layer pattern.

Flat configuration color CRT display apparatus with scanning correction

Structures and methods of manufacture for field emission cathodes having cathode tips of minute size, whereby a block formed of pairs of substrates each having a patterned thin layer of cathode material sandwiched therebetween is sliced into a plurality of sections, to obtain array substrates each having an array of exposed regions of cathode material. A metal layer for constituting electron extraction electrodes and corresponding extraction apertures is formed over these exposed regions and appropriately shaped, after first forming mask layer portions upon the exposed cathode material regions.

Field emission cathodes and method of manufacture thereof

A flat configuration CRT has a plurality of line cathodes arrayed with a predetermined pitch, a focus electrode section for focusing respective electron beams which are emitted for the line cathodes, and pairs of deflection plates having opposed deflection electrodes for executing deflection of the focussed electron beams, the deflection electrodes of each deflection plate being divided into at least two parts, and an image display section upon which the electron beams are incident. The length of a region in which deflection is executed by the deflection electrodes is made no greaer than a value which is approximately three times the pitch of the line cathodes.

A flat CRT apparatus has a set of vertical scanning deflection electrodes arrayed down one flat inner face of the CRT, spaced apart from an opposing face having a photo-emissive layer formed thereon, and an electron gun for emitting a single flat electron beam or a row of narrow line electron beams into the space between the scanning electrodes and the photo-emissive layer. Vertical scanning of a raster display is executed by scanning voltages sucessively applied to the scanning electrodes, with the deflected electron beams thus obtained being then horizontally swept in common by a horizontal deflection electrode, so that each electron beam is utilized to display a large number of picture elements of each horizontal scanning line of the display picture.

Flat CRT display apparatus

A flat type cathode ray tube. Electrode beams are vertically emitted from electron beam emitting sources along vertical scanning electrodes which have a strip-shaped configuration in horizontal direction and are insulated from each other and lined up in the vertical direction. The beams turn at a predetermined position toward a phosphor screen for vertically scanning and are horizontally focussed and deflected onto the phosphor screen by horizontal focussing and deflection electrodes.

Flat type cathode ray tube

A drive method for a color CRT in which a point-sequential color video signal is produced to drive a modulation electrode of the CRT, in which an index signal is generated consisting of pulses at a frequency identical to a frequency of scanning successive screen phosphor color trios of the CRT, multi-phase index signals are derived from that index signal, and respective time differences between scanning timings of each color trio in each scan line and a specific index signal phase are successively measured, stored in memory, and subsequently read out to produce timing control signals for gating the color components of the point-sequential video signal. Requirements for timing accuracy and assembly precision of the CRT can thereby be substantially relaxed by comparison with a prior art single-phase index signal method.

Drive method for synchronizing scanning and modulation of

In a flat-shaped display apparatus has a face plate, a rear plate, side plates, and necessary electrodes therein, a supporting plate and plural supporting rods which are connected to an edge of the supporting plate at intervals of a certain distance are provided between the face plate and the rear plate. The supporting rods are made of metal and all bonded parts are covered by guide plates so that no adhesive is exposed to the electron beams. Therefore, over-scanning of the electron beams can be made, without the electron beams impinging on the adhesive thereby enabling effective distortion compensation.

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Isehara, Japan

Kaoru Tomii