Lpkf Laser & Electronics Ag

Institut Jozef Stefan

Univerza V Ljubljani

Optotek D.o.o.

Rok Petkovsek

Roman Ostholt

Bojan Marin

Janez Pirs

Robert Blinc

Silva Pirs

Bostjan Podobnik

Andrej Vrecko

Udo Buenting

Martin Copic

Uros Orthaber

Vid Agrez

Jaka Petelin

Tomaz Pozar

Udo Bünting

A method for transferring a printing substance provided as a coating on a carrier onto a substrate by laser radiation from a laser beam source that comprises an amplifier and that has an output power includes initiating a transfer process at the start of an active phase during a first time period by a temporary increase in the output power above an upper power threshold of the laser radiation, and adjusting the output power during a second time period of the active phase following the first time period, wherein the output power is adjusted during the second time period constantly in the range between the upper power threshold and a lower power threshold. The laser radiation and the carrier are moved relative to one another and the output power of the laser beam source is time modulated.

Method and apparatus for transferring a printing substance onto a substrate by means of laser radiation

This invention solves the technical problem of compensating for the angular dependence of the contrast in optical devices comprising liquid crystal displays (LC optical light shutters, which operate on the principle of electrically controlled optical birefringence), with the aid of a compensation layer exhibiting optically negative birefringence, which enables the angular compensation of the LC layer birefringence in the state in which the LC molecules are homeotropically aligned (typical optically positive birefringence). The process for the manufacture of the optically negatively birefringent compensation layer is devised on the controlled spontaneous deformation of the polymer molecules during the polymerization procedure. The manufacturing process is feasible by the employment of known and well-controllable technical procedures, and enables the mass production of compensation layers. The invention solves the problem of manufacturing a compensation layer exhibiting the required optically negative birefringence, as well as the construction/manufacturing of the optical light shutter, which utilizes such a compensation film.

Process for the manufacturing of the polymer compensation layer for LCD optical light shutter and the construction thereof

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Ljubljana, Slovenia

Rok Petkovsek