Publication

An active microphotodiode array of oscillating pixels for retinal stimulation

Mihai Adrian Ionescu, Philippe Renaud, Marco Mazza, Olof Pontus Linderholm
2004
Journal Articles

Abstract

We have developed an active microphotodiode array (MPDA) for retinal stimulation. The unique feature of the device is that each pixel acts as an independent oscillator, whose frequency is controlled by the incident light intensity. The design is based on a double inverter relaxation oscillator, and the photodiodes are of PIN-type. These oscillating pixels stimulate the nervous tissue with bipolar pulses. The prototype stimulator chips are realized in standard 0.35 mum CMOS technology. The reported preliminary data and performance demonstrate the potential of the new concept for future retinal prostheses. (C) 2003 Elsevier B.V. All rights reserved.

Official source

https://infoscience.epfl.ch/entities/publication/dd444dd3-1da6-4365-9828-146fe20ecd1f

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Mihai Adrian Ionescu, Philippe Renaud, Marco Mazza, Olof Pontus Linderholm
2004
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/dd444dd3-1da6-4365-9828-146fe20ecd1f

About this result

Related concepts (21)

Neuroprosthetics

Neuroprosthetics (also called neural prosthetics) is a discipline related to neuroscience and biomedical engineering concerned with developing neural prostheses. They are sometimes contrasted with a brain–computer interface, which connects the brain to a computer rather than a device meant to replace missing biological functionality. Neural prostheses are a series of devices that can substitute a motor, sensory or cognitive modality that might have been damaged as a result of an injury or a disease.

Retinal ganglion cell

A retinal ganglion cell (RGC) is a type of neuron located near the inner surface (the ganglion cell layer) of the retina of the eye. It receives visual information from photoreceptors via two intermediate neuron types: bipolar cells and retina amacrine cells. Retina amacrine cells, particularly narrow field cells, are important for creating functional subunits within the ganglion cell layer and making it so that ganglion cells can observe a small dot moving a small distance.

Retina

The retina (from rete "net"; : retinae or retinas) is the innermost, light-sensitive layer of tissue of the eye of most vertebrates and some molluscs. The optics of the eye create a focused two-dimensional image of the visual world on the retina, which then processes that image within the retina and sends nerve impulses along the optic nerve to the visual cortex to create visual perception. The retina serves a function which is in many ways analogous to that of the film or in a camera.

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