Pixel-based Optical Feedback to Correct Ageing and Non-uniformities in Large-area Displays

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VAN LCOS microdisplays: a decade of technological evolution

Abstract—Microdisplays of the liquid crystals on silicon (LCOS) type have gone through a rapid evolution during the last decade. We present an overview of how vertically aligned nematic (VAN) LCOS have evolved from an attractive, but notoriously difficult and even infamous technology, to the mainstream microdisplay technology that it is today. At the same time, we highlight a number of remaining issues and concerns, and present some ideas of how to remedy them

Electronic compensation for fringe-field effects in VAN LCOS microdisplays

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Measurement and evaluation of the applicability of reflective displays for direct view applications

A measurement set-up is presented to analyse the applicability of reflective displays for direct view applications. Essential for this set-up is to simulate the different types of illumination caused by environmental light. As an example the applicability of a reflective PNLC display is evaluated

An intelligent driving scheme for high-voltage display drivers

An algorithm to reduce the power consumption in bistable display drivers is presented. This algorithm can also be used in other flat panel displays like OLEDs, standard (S)TN LCDs,... and is very important for battery-powered applications. The complete block diagram of the low-power high-voltage display driver and a comparison of the normalized frame energy for different driving schemes and different patterns are presented

Introduction of a pseudo-6th order ISDN splitter with bandstop topology

A newly developed ‘integrated services digital network’ (ISDN) splitter with bandstop (BS) topology is presented and compared to an actual ISDN splitter with a traditional lowpass (LP) topology. The LP-to-BS topology change reduced the amount of filter stages: a LP ISDN splitter requires an 8th order elliptic-like filter in order to be compliant to the standard ‘TS 101 952-1-4 V1.1.1’ [1] of the European Telecommunications Standards Institute (ETSI), whereas the BS ISDN splitter only needs a pseudo-6th order elliptic-like filter. The design of the new BS ISDN filter is discussed in the light of the enforced ETSI specifications. Furthermore, both the ISDN splitters are compared in the field of their specific stopband performance and their physical implementation. The area reduction that comes together with the introduction of the new ISDN splitter with BS topology is more than 25%

A silicon backplane technology for microdisplays

A silicon backplane technology is described for the fabrication of high-resolution microdisplays. The technology is embedded in a 0.7 mum CMOS technology, and comprises DEMOS devices for enabling voltage spans of 12 V, and a special back-end processing module for planarizing the wafer and light shielding. This technology is used to develop a GXGA (2560times2048 pixels) microdisplay with 15 mum pixels on which the first results are reported

Monocrystalline silicon active matrix reflective light valve

In September 1997, six European companies and research institutes started the Esprit project Mosarel (Monocrystalline Silicon Active Matrix Reflective Light Valve) for an initial period of 2 years. The aim was to show the feasibility of making microdisplays using an ASIC approach, combining standard CMOS technology with standard liquid crystal technology. The target demonstrators were a rear projector and a head-up display built around a 5-megapixel microdisplay with 15 µm pixels, which had to be developed first. During this ambitious project, the consortium has faced a great number of anticipated, but also many unexpected difficulties, both on the technological and on the logistic level. Despite these difficulties, which caused a considerable delay, it was eventually possible to show a working rear projection demonstrator, albeit with several visible defects. In this presentation, an overview will be given of the project, starting with the initial ideas, describing some of the most important difficulties that were encountered and the way they were solved or avoided and ending with the actual achievements and the still existing loose ends