Koninklijke Philips Corporation N.V.

Harald Glaeser

Hans-Helmut Bechtel

Wolfgang Busselt

Cornelis Reinder Ronda

Joachim F Opitz

Johannes Marra

Volker Dirk Hildenbrand

Claudia Mutter

Thomas Juestel

Dietrich Bertram

Volker Van Elsbergen

An illumination system comprising, a) a light source; b) a light-directing assembly () in close proximity to the light source and comprising a plurality of microprisms (), each microprism comprising an input surface () that admits light radiating from the light source, an output surface () distal from and parallel to the input surface (), and at least one sidewall () disposed between and contiguous with the input and output surfaces and forming an obtuse tilt angle with respect to the input surface () and further positioned for effecting total reflection of the light rays received by the input surface (), the sidewalls () of the microprisms () defining interstitial regions () between the microprisms (); c) at least one blocking means () positioned to block the passage of light through the sidewalls (); and d) an optical means () located between the light source and the light-directing assembly (), with the special feature that e) said optical means () comprise a reflective powder () to at least substantially shield the blocking means () from direct exposure to lig radiated from the light source.

Illumination system

In an UV-reflecting layer for discharge lamps, the layer comprises at least 0.1% by weight of AlOand at least 0.1% by weight of a material having a higher refractive index than AlO, so that as large a proportion of UV light as possible can be reflected and as large a portion of visible light as possible can be emitted by the lamp.

Method of providing a UV-reflecting layer

A light-collimating system for collimating light from a light source has a plurality of elements (', . . . ), each element including at least a first wall (&#x2032;, . . . ) and at least a second wall (&#x2032;, . . . ). The first () and second wall (&#x2032;) of adjacent elements are spaced with respect to each other at a side of the light-collimating system facing the light source, the spacing defining an aperture window (&#x2032;, . . . ) for admitting light into the light-collimating system. The first and second wall of said adjacent elements form a wedge-shaped structure widening in a direction facing away from the light source. The first and the second wall are provided with a specular reflecting surface at a side facing the wedge-shaped structure. According to the invention, the wedge angle (w of the first and second wall with respect to the normal on the aperture window are adjustable for enabling adjustable collimation.

Light-collimating system

The invention relates to a liquid crystal picture screen provided with a background lighting system which comprises at least one light source and a collimator formed by hourglass-shaped microprisms. The light of the light source can be effectively collimated within a desired angular range by means of the collimator.

Liquid crystal picture screen with collimator having microprisms

A plasma color screen fitted with a carrier plate, a transparent front plate, a ribbed structure dividing the space between the carrier plate and the front plate into discharge cells filled with a gas, with one or more electrode arrays on the front plate and on the carrier plate to generate corona discharges in the discharge cells and with a segmented phosphor layer, which plasma color screen comprises a pixel matrix array in which are grouped discharge cells for red, green and blue to form a pixel, where each pixel comprises a discharge cell for blue which is common to two adjacent pixels.

Plasma color display screen with pixel matrix array

UV-reflecting layer, lamp with such a layer, and method of providing such a layer on a lamp glass

A plasma display panel having a structured black matrix ( ) which is coated with a reflecting layer ( ) on the side turned away from the viewer. Visible light incident from outside is absorbed by the black matrix ( ) and light incident from inside is reflected by the reflecting layer ( ). This enhances the LCP value of the whole plasma screen. A protective layer ( ) such as MgO is deposited on the black matrix and reflecting layer and so formed over the black matrix and said reflecting layer so as to reduce undesired reactions of the black matrix and the reflecting layer with the dielectric layer, such as during high temperature conditions during manufacture.

Plasma display with enhanced contrast and protective layer

The invention relates to a plasma picture screen with a improved white color point. The front plate ( ) of the plasma picture screen has a blue layer on the side facing the plasma discharge. This may be the dielectric layer ( ), the protective layer ( ), or an additional layer.

Plasma picture screen with improved white color point

The invention describes a cathode ray tube in which the position of the electron beam ( ) is determined in that detection strips ( ) are arranged between or below the individual phosphor strips of the phosphor layer ( ). The detection strips ( ) each comprise a semiconductor component which amplifies the measured current signal. This renders the position determination of the electron beam ( ) more definite and reproducible.

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Aachen, Germany

Harald Glaeser