Patent ID: 7751896
Filing Date: 2010-07-06
Classification: A61N

Abstract:
1. An active retina implant with a multiplicity of pixel elements that convert incident light into electric stimulation signals for cells of the retina with which stimulation electrodes are to make contact, each pixel element having at least one image cell that converts incident light into electric signals, and at least one amplifier whose input is connected to the image cell and whose output is connected to at least one stimulation electrode to which it supplies a stimulation signal, and with an energy supply which converts externally coupled external energy into a supply voltage for the image cells and the amplifiers, wherein the image cell has a logarithmic characteristic according to which incident light of specific intensity is converted into electric signals of specific amplitude, wherein each pixel element has a logarithmic image cell for local image brightness, and each pixel element is assigned at least one logarithmic image cell for global brightness, and wherein the amplifier is designed as a differential amplifier of which one input is connected to the image cell for local image brightness, and of which the other input is connected to the image cell for global brightness.