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Grenoble, France

Singh G.,University of Aarhus | Gohri V.,Microoled | Pillai S.,University of Aalborg | Arpanaei A.,Iran National Institute of Genetic Engineering and Biotechnology | And 2 more authors.
ACS Nano | Year: 2011

We demonstrate the use of binary colloidal assemblies as lithographic masks to generate tunable Au patterns on SiO2 substrates with dimensions ranging from micrometers to nanometers. Such patterns can be modified with different chemistries to create patterns with welldefined sites for selective adsorption of proteins, where the pattern size and spacing is adjustable depending on particle choice. In our system, the binary colloidal assemblies contain large and small particles of similar or different material and are self-assembled from dilute dispersions with particle size ratios ranging from 0.10 to 0.50. This allows masks with variable morphology and thus production of chemical patterns of tunable geometry. Finally, the Au or SiO2 regions of the pattern are surface modified with protein resistant oligoethyleneglycol self-assembled molecules, which facilitates site selective adsorption of proteins into the unmodified regions of the pattern. This we show with fluorescently labeled bovine serum albumin. © 2011 American Chemical Society. Source

Microoled | Date: 2011-10-21

A matrix display device with a definition determined by a plurality of pixels, the matrix display device including at least one controller suitable for producing display light intensity signals for each of the pixels; and a matrix of pixels organized in a mosaic of a plurality of identical arrangements of a determined number of pixels, wherein a first number of pixels of an arrangement are dedicated to display of a first image and receives the light intensity signals associated with the pixels of the first image that correspond thereto, one or more other pixels of the arrangement are dedicated to display of a second image and receiving light intensity signals associated with the pixels of said second image that correspond thereto, the matrix display device producing the merged display of the first image and of the second image, the two images being, if necessary, redimensioned by scaling means.

Agency: Cordis | Branch: H2020 | Program: RIA | Phase: ICT-03-2014 | Award Amount: 4.10M | Year: 2015

The LOMID project will define pathways to the manufacture of flexible OLED microdisplays with an exceptionally large area (16 mm x 20 mm, screen diagonal of 25.4 mm) at acceptably high yields (>65%). This will be achieved by developing a robust silicon-based chip design allowing high pixel counts (1024x1280 (SXGA)) and high spatial resolution(pixel sizes of 10 m x 10 m corresponding to 2000 ppi). These display innovations will be coupled to a highly reliable manufacturing of the backplane. Cheap processes (e.g. based on 0.35 m lithography) will be developed and special attention will be given to the interface between the top metal electrode of the CMOS backplane and the subsequent OLED layers. All these developments will be done on a 200 mm wafer scale. Along with this, a new testing procedure for quality control of the CMOS wafer (prior to OLED deposition) will be developed and promoted for standardisation. The flexibility of the large area microdisplays will be achieved by wafer thinning to enable a bending radius of 45 mm. Along with the new functionality, the durability of the devices has to be guaranteed despite bending to be comparable to rigid devices. The project will address this by improving the OLED efficiency (e.g. operating lifetime > 15,000 hours) and by modifying the device encapsulation to both fulfil the necessary barrier requirements (WVTR < 10^-6 g/d m2) and to give sufficient mechanical protection. The demand for and timeliness of these flexible, large area microdisplays is shown by the strong interest of industrial integrators to demonstrate the benefits of the innovative OLED microdisplays. Within the project, industrial integrators will validate the projects microdisplays in smart glasses for virtual reality and to aid those with impaired vision.

Gohri V.,Microoled | Boizot J.,Microoled | Doyeux H.,CEA Grenoble | Haas G.,Microoled
Journal of Photonics for Energy | Year: 2012

We report high brightness and low operating voltage efficient green organic light-emitting diodes (OLEDs) based on silicon complementary metal-oxide semiconductor (CMOS) backplane which can be used in applications such as microdisplays. The small molecule top-emitting OLEDs are based on a fluorescent green emitter accompanied by blocking, doped charge transport layers, and an anode fabricated with standard CMOS processes of a 200 mm integrated circuit (IC) fab. The devices are designed to maximize the efficiency under low operative bias so as to fit the limited voltage budget of the IC. This was done by making optical simulations of the device structure, optimizing the organic layer thicknesses and charge injection in the n and p transport layers. The devices reach a current efficacy of 21.6 cd/A at a luminance of 20,000 cd/m 2. The devices exhibit a voltage swing as low as 2.95 V for a contrast ratio of 1000. The optimized devices have a high lifetime of 6000 and 8800 h at 5000 cd/m2. Furthermore, aging inside the emission layer is investigated. © 2012 Society of Photo-Optical Instrumentation Engineers (SPIE). Source

Gohri V.,Microoled | Espuno L.,Microoled | Haas G.,Microoled | Doyeux H.,CEA Grenoble | And 3 more authors.
SID Conference Record of the International Display Research Conference | Year: 2011

We report high luminance OLED (organic light emitting diode) microdisplay with a high resolution of 5.4 Mpixels and very low operating voltages. The microdisplay is capable of operating at 10,000 cd/m 2 and exhibits a high contrast ratio of 1,000,000:1 and power consumption less than 200 mW. Source

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