Ciska Doornkamp

8.1: Novel High Performance Transflective LCD with a Patterned Retarder

For a better optimization of the transflective AM-LCD, a new technology with extra free parameters is inevitable. Our novel transflective AM-LCD with in-cell patterned retarder enables us to optimize further, resulting in a good brightness, contrast ratio, viewing angle and low chromaticity for reflection and transmission at the same time.

LP-11: Late-News Poster: Novel Transflective LCD with Ultra-wide Viewing Angle

A novel transflective LCD with ultra-wide viewing angle has been developed. This display contains an in-cell patterned retarder with two different values of the birefringence in each pixel, which replaces the conventional external retarders. As a result this display is brighter, thinner and has lower power consumption and wider viewing angle than conventional transflective LCDs.

27.3: New Cholesteric Colour Filters for Reflective LCDs

In this paper, we describe a new method to manufacture cholesteric colour filters. The cholesteric colour filter is made by a simple method, comprising one coating step and two UV exposure steps. The optical performance of the cholesteric colour filter and a reflective LCD with a cholesteric colour filter inside the cell will be discussed. The cholesteric colour filter has a high colour purity and the display shows a high contrast ratio of 35:1.

Technologies towards patterned optical foils applied to transflective LCDs

— For better front-of-screen performance for transflective LCDs, a technology with extra free optimization parameters for the optical stack is needed. Thin wet coatable retarders which enable adjustment of the optical activity on the (sub)pixel level have been developed. Isotropic domains have been created in nematic retardation films by thermal patterning or photopatterning. Employing such a patterned retarder in a transflective LCD leads to an LCD that is lighter and thinner with good reflectivity, high transmission, and low chromaticity at all gray levels and wide viewing angles. The patterned thin-film technology has been proven to be versatile and applicable in various LCD designs.

Next‐generation mobile LCDs with in‐cell retarders

In-cell retarders can be a major breakthrough for mobile LCDs. When a patterned in-cell retarder replaces the external retarders on transflective LCDs, brighter and thinner transflective LCDs with lower power consumption and wider viewing angle can be obtained. Additionally, when in-cell retarders are applied in reflective LCDs, the thickness of the LCD is considerably reduced without affecting the optical performance of the reflective LCD. This paper presents the technology needed to make in-cell retarders and the performance of reflective and transflective LCDs with in-cell retarders.

26.5: Requirements on Backlights for LCD's with Transmissive Cholesteric Color Filters

Transmission spectra of interference color filters are calculated for various light sources and angular distributions of incident light. Using conventional lamps, the achievable color gamut is poor for all angular distributions. To improve performance, a different light source and pre-shifted plus broadened reflection windows of the interference filters should be used.