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Dive into the research topics where Philippe Le Roy is active.

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Featured researches published by Philippe Le Roy.


Journal of The Society for Information Display | 2007

An averaging pixel structure using microcrystalline-silicon films prepared at high temperature for AMOLED displays

Arc'Hanmael Gaillard; Régis Rogel; Samuel Crand; Tayeb Mohammed-Brahim; Philippe Le Roy; Christophe Prat

— A new voltage-addressed pixel using a multiple drive distribution has been developed to improve, in a simple way, the brightness uniformity of active-matrix organic light-emitting-diode (AMOLED) displays. Moreover, circuits were realized using microcrystalline-silicon (μc-Si) films prepared at 600°C using a standard low-pressure CVD system. The developed p-channel TFTs exhibit a field-effect mobility close to 6 cm2/V-sec. The experimental results show that the proposed spatial distribution of driving TFTs improves the uniformity of current levels, in contrast to the conventional two-TFT pixel structure. Backplane performances have been compared using circuits based on μc-Si and furnace-annealed polysilicon materials. Finally, this technology has been used to make an AMOLED demonstration unit using a top-emission OLED structure. Thus, by combining both an μc-Si active-layer and a current-averaging driver, an unsophisticated solution is provided to solve the inter-pixel non-uniformity issue.


Polymer International | 2006

Organic light‐emitting diode (OLED) technology: materials, devices and display technologies

Bernard Geffroy; Philippe Le Roy; Christophe Prat


Archive | 2006

Active-matrix display, the emitters of which are supplied by voltage-controlled current generators

Philippe Le Roy; Christophe Prat; Pierrick Martin


Archive | 2004

Display device and control circuit for a light modulator

Philippe Le Roy; Christophe Prat; Christophe Féry


Archive | 2004

Image display screen

Philippe Le Roy; Christophe Prat; Fabien Ammardji


Archive | 2004

Image display screen and method for controlling said screen

Philippe Le Roy; Christophe Prat


Archive | 2007

Display device and uses thereof

Philippe Le Roy; Christophe Prat; David Vaufray


Archive | 2008

Recording level gauge type organic light emitting diode

Christophe Prat; David Vaufrey; Philippe Le Roy


Archive | 2007

Panel of organic light-emitting diodes, provided with integrated top supply electrodes

Christophe Prat; David Vaufrey; Philippe Le Roy


Archive | 2007

Transmitter and associated display device

David Vaufrey; Philippe Le Roy; Christophe Prat

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