Ink-Jet Printing of Color Optical Filters for LCD Applications

At the age of multi-media, portable electronic devices such as mobile phones, personal digital assistant and handheld gaming systems have increased the demand for high performance displays with low cost production. Inkjet printing color optical filters (COF) for LCD applications seem to be an interesting alternative to decrease the production costs. The advantage of inkjet printing technology is to be fast, accurate, easy to run and cheaper than other technologies. In this master thesis work, we used various disciplines such as optical microscopy, rheology, inkjet printing, profilometering and colorimetry. The specific aim of the thesis was to investigate the feasibility of using company-A pigment formulation in inkjet production of COF for active matrix LCD applications. Ideal viscosity parameters were determined from 10 to 20mPa·s for easy inkjet printing at room temperature. The red pigments used are fully dispersed into the solvent and present an excellent homogenous repartition after printing. Thickness investigations revealed that the printed COF were equal or slightly thicker than typically manufactured ones. The colorimetry investigations demonstrated color coordinates very close to the NTSC red standard. LED backlighting seems to be a valuable solution to combine with the printed COF regarding to the spectrum and color analysis. The results on this thesis will increase the understanding of inkjet printing company-A pigments to produce COF for LCD applications.

Vitpunktsförskjutningens påverkan på ICC-profiler vid användande av optiska vitmedel

The connection between fluorescence and color management still is a relatively unexplored area. Thefollowing composition analyses the theory that when printing on fluorescent ink jet paper using ICCprofilesa more yellow print will appear. In theory the ICC-profile compensate for blue light that fluorescefrom the paper with the complementary color, yellow. The human eye apprehands this fluorescentlight as white.When categorizing a number of ink jet qualities some tests to indicate change of color in the final printwere made. Five qualities were chosen for further analyses, each with different white point. TheTC3.5CMYK target was prined on an ink jet printer and measured with different filters for the measurementequipment, GretagMacbeth Spectrolino. U- and UV-filters were used during the testings.From the measurement data ICC-profiles were made to make it possible to watch how the profiles compensatefor the blue change of color that appeared in the data. Although a distinct change of color intoblue were discernible in the measured data there is no evident proof that this cause a final print thatis more yellow. Other conclusions and results are to be read at the end of this composition.

Softproof och färghantering i designprocessen : Från skärm till tryck

Målet med detta examensarbete har varit att ge en överblick över de parametrar som påverkar möjligheten att upprätta ett färghanterat arbetsflöde. Ett färghanterat arbetsflöde ger möjlighet att förutsäga färgåtergivningen i trycksaker via softproof – skärmkorrektur. Examensarbetet belyser de problem och fallgropar som finns i arbetsflödet och hur de kan påverka relevansen för en bedömning av tryckresultat via softproof. Examensarbetet behandlar hur färgåtergivningen påverkas av betraktningsljus och omgivningsljus samt vikten av att arbeta med en kalibrerad bildskärm – en förutsättning för att kunna utföra en färgriktig softproof. Som utgångspunkt för examensarbetet har arbetsflödet på fyra företag i branschen använts och hur väl de uppfyller gällande standarder, ISO 3664 och ISO 12646. Genom ett visuellt test som utarbetats inom examensarbetet har arbetsmiljöns påverkan på färgseendet kunnat påvisas. Testet kan ge en vägledning om hur avvikelser från ISO 3664 och ISO 12646 i arbetsmiljön påverkar bedömningen av färger vid softproof och provtryck.

Color detection and segmentation for road and traffic signs

This paper aims to present three new methods for color detection and segmentation of road signs. The images are taken by a digital camera mounted in a car. The RGB images are converted into IHLS color space, and new methods are applied to extract the colors of the road signs under consideration. The methods are tested on hundreds of outdoor images in different light conditions, and they show high robustness. This project is part of the research taking place in Dalarna University / Sweden in the field of the ITS.