U.S. Philips Corporation

Koninklijke Philips Corporation N.v.

Remko Horne

Gerardus N Van Veen

Jacobus M Dings

Dirk Willem Harberts

Siebe Tjerk De Zwart

Maarten A Van Andel

Joseph C Bosman

Karel E Kuijk

Albertus A Sluyterman

Arie R Van Doorn

Petrus J Peters

Godefridus P Van Melis

Cornelius Antonius Van Den Heuvel

Berend J Ter Weeme

Augustinus H Boshouwers

Hans-Helmut Bechtel

A display device () comprises a display screen () which comprises a blue color filter layer (B) and a blue phosphor (B). The blue phosphor is provided with or covered by blue pigments.

Color display device with color filter and pigment

A transparent inorganic intermediate layer extends between a color filter layer and a phosphor layer in a color display device. The intermediate layer stops electrons before they can penetrate the color filter layer. Aging phenomena which adversely affect the effectiveness of the color filter layer are thus precluded. It is alternatively possible to use hitherto useless pigments, in particular pigments which are unstable when they are exposed to an electron bombardment in the color filter layer (or layers). By virtue thereof, the effectiveness of the color filter layer has been increased.

Color display device having color filter layers

A color cathode ray tube is provided with a saddle-shaped shadow mask. As a result, the sensitivity to doming and microphonics of the mask is improved. This is advantageous, in particular, for a cathode ray tube having a very flat display window. Preferably, the display device in which the cathode ray tube is employed is provided with two dynamic quadrupoles, for example, in front of the electron gun and in front of a deflection unit.

Color display device comprising a saddle-shaped color selection electrode

In, for example a field emission display, the invention provides the possibility of combining a plurality of sub-substrates that are attached to a larger rear wall, because notably different modes of multiplexing provide a wider positioning tolerance of a sub-substrate with respect to the front plate. Moreover, the different multiplexing techniques lead to a smaller number of connections, even if no use is made of a rear wall supporting of sub-substrates. A plurality of multiplexing techniques provides the possibility of activating a substantially equally large number of pixels of different colours during parts of an image period, so that there is substantially no colour flicker.

Display device

In a method in which a top coating (2) on a relatively hard substrate (1) is patterned by means of a stream of kinetic particles while being masked by a mask (3), the substrate (1) is coated with a damping layer (4) of a ductile material before the top coating (2) is provided.

Method of patterned eroding of a coating provided on a substrate

After a plate or layer of non-metallic, particularly hard and brittle material has been provided with a (metal) mask having a plurality of apertures arranged in a pattern, it is exposed to at least one jet of abrasive powder particles, which jet is moved relative to the plate. The mask has its surface facing the surface on which the jet impinges secured to the plate or layer of non-metallic material by means of a layer of adhesive material having a thickness which is smaller than the size of the abrasive powder particles.

Method of providing a pattern of apertures and/or cavities in a plate or

In, for example a field emission display, the invention provides the possibility of combining a plurality of sub-substrates that are attached to a larger rear wall, because notably different modes of multiplexing provide a wider positioning tolerance of a sub-substrate with respect to the front plate. Moreover, the different multiplexing techniques lead to a smaller number of connections, even if no use is made of a rear wall supporting sub-substrates. A plurality of multiplexing techniques provides the possibility of activating a substantially equally large number of pixels of different colors during parts of an image period, so that there is substantially no color flicker.

A flat-panel display device comprising a substrate, a patterned layer and an absorbing layer, the absorbing layer interposed between the substrate and the patterned layer, the patterned layer being formed of a material having a rate of erosion greater than the rate of erosion of the substrate under powder spraying, and the absorbing layer being of a material capable of absorbing the kinetic energy of particles comprising a powder spray.

A picture display device having an evacuated envelope (1) comprises a first wall (2) which is provided with a display screen (3), and a second wall (5), and is provided with an internal vacuum support (11) between the two walls (2, 5). The internal vacuum support (11) comprises a dielectric plate at least at the side facing the first wall (2), which plate is arranged opposite the display screen (3) and is provided with cavities (12) at the location of the pixels (4R, 4B, 4G) of the display screen (3). The internal vacuum support (11) accommodates cavities (12) which constitute a lateral system of ducts. The continuous exhaust path of the internal vacuum support (11) communicates via the exhaust cavity (25) with an exhaust connection (9).

Picture display device provided with an internal vacuum support

By incorporating two-pole circuits (13) as switching elements in a picture display device based on field emission, the emission (and hence the picture intensity) is substantially defined by the charge of a capacitance (15) associated with a part of a pixel (8). Charge-controlled drive leads to a more accurate adjustment than the voltage-controlled drive used until now and leads to lower drive voltages, less power consumption and a longer lifetime of the phosphors used in the display device.

Field emitter display device with two-pole circuits

In a flat display device, for example, a luminescent display a spacer structure (5) is provided between two substrates (1, 3). To this end a mask (9, 15) consisting, if necessary, of a plurality of layers is incorporated in a photosensitive material (8, 13). After exposure, development and removal of the mask, the desired spacer structure is obtained.

Method of making flat electron display device with spacer

Flat electron display device with spacer and method of making

The manufacture of pointed electrodes (28) (field emitters) is considerably simplified by a directed sputtering deposition instead of by vapor deposition. Directed deposition of the material (12) to be sputtered can be effected by means of a collimating filter (4) and, if necessary, a cover plate (8).

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Eindhoven, Netherlands

Remko Horne