Community Research and Development Information Service - CORDIS

Final Report Summary - GREEN (Low power high image quality display using colour sequential display technology)

As preplanned in the project proposal and the grant agreement, this Marie Curie IIF project (Green 237806) is aimed to find a solution for the future display which has both low power consumption and high image quality.

In this project period, form October 2009 to September 2011, a local-primary-desaturation (LPD) color-sequential display technology was proposed and implemented. This LPD color sequential technology is realized on a fast liquid crystal display (LCD) system with spatially addressable backlight. With LPD FSC technology, the need of color filter was removed, the backlight can be dimmed according to the image content, so the light efficiency was increased with the factor higher than 3. Actually, in our simulation, the power consumption can be reduced to 20% (this accurate number varies for different image content) of the currently used LCDs, this is a potential green display technology. With LPD color sequential technology, the spatial resolution can be 3 times higher compared to the currently used LCDs with the same amount of the addressable pixels. It potentially reduces production cost and is well suited for 3-D display applications. This power efficient and high image technique will lead to globally important energy savings and reduce the material cost related to color filter and driving circuits.

This LPD color sequential technology includes the backlight driving algorithm and LCD panel driving method. A simulation program and a simulation setup were created for research and optimization purpose. The algorithm was applied in both field sequential color and spatial-temporal color display systems. A 180Hz color-filterless LCD based demo system was built up to implement and verify the LPD color sequential technology; a 120Hz LCD with color filter was used to simulate the spatial-temporal color display with LPD. Perceptual experiments and statistic analysis were carried out to evaluate the performance of such LPD color sequential technology with different settings. A color breakup measure was built up based on the perception experiment and statistic analysis, which has a high correlation with the subjective perceptual data. The progress of this LPD technology was published in IEEE/OSA Journal of Display Technology (JDT) and Journal of Society of Information Display (JSID). And we also had a paper presented as a poster in IVESC2010 conference (International Vacuum Electron Sources Conference held on October 14-16, 2010, in Nanjing, China) and an oral presentation in SID2011 conference (International Symposium of Society of Information Display, held in May 15-21, 2011, Los Angeles, USA).

In this Marie Curie project action, the research fellow, Yuning Zhang, was provided with various opportunities regarding to skill-training, knowledge-transfer, knowledge-integration and so on. The project was first implemented in Philips Research then in Philips Consumer Lifestyle, so the research fellow has close cooperation with colleagues with different cultures and different backgrounds. Yuning Zhang has a group meeting and a project meeting every week, so there are regular communications between the research fellow and the supervisor, and also with the colleagues. The research fellow have the chance to attend the DOVO of Philips Research with presentations given by researchers from different Research sites, like in Europe, Asia, America and so on, with various topics covering biology, information, lighting, material and so on. Yuning also paid a visit to Philips Research Shanghai, where the return phase of the project will be implemented, and gave a presentation to and had discussion with the colleagues there.

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