U.S. Philips Corporation

Koninklijke Philips Corporation N.v.

Hans Galenkamp

Leendert Van Der Tempel

Jacobus N Dekker

Maarten H Zonneveld

Richard B Droste

Bruno W J Spolders

A method of manufacturing a display device comprising an air-tight envelope and at least a glass part ( ) which forms part of said air-tight envelope, is characterized in that the glass part ( ) is warmed up, during a first time period, at a first temperature (T ), whereafter the glass part is immersed, during a second time period, in a fluid ( ) at a second temperature (T ), said second temperature being lower than the first temperature (T <T ). Preferably, 25&deg;&lE;T &minus;T &lE;85&deg;, and, in particular, T &minus;T &ap;50&deg;. Preferably, 50&deg; C.&lE;T &lE;100&deg; C., and, in particular, T &ap;65&deg; C. Preferably, the glass part is a display window ( ) or a cone portion of a display window, and the fluid is water ( ).

Method of testing a display device during the manufacture thereof

A method in which a (display) device having a part (41) comprising a first wall (43) and a second wall (44) is manufactured, which part (41) is warmed up during the temperature treatment by unilateral irradiation with heat by means of heat radiators (35). The method is characterized in that the temperature treatment further comprises measures which cause a fluid (53) to be fed past the outer surface of the first wall (43) to remove heat from said outer surface and/or measures which cause a fluid to be fed past the inner surface of the second wall (44) to supply heat to said second surface. In an embodiment, the inner surface of the second wall (44) is provided with a heat-absorbing coating (48). Preferably, the heat radiators (35) emit electromagnetic radiation having a wavelength below 3 .mu.m.

Method of manufacturing a display device with reduced thermal stress

The invention relates to a method of asymmetrically cleaving a plate (1) of brittle material, in which a thermal load and a mechanical load are provided on the plate (1) and the plate (1) is cleft along a desired cutting line (7).

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Eindhoven, Netherlands

Hans Galenkamp