Abstract:
The present invention concerns an analysis process of a line transfer photosensitive device.The charge-signal and the charge noise transfers from the columns towards the memory have the same duration and are made by using a same training charge, stored in memory, that must be at least sufficient to allow to pass in high inversion at the beginning of the transfer from the columns towards the memory. The transfers of the charge-signal and the charge-noise from the memory towards the read-out register or the drain have the same duration and are made by using training charges at least sufficient to allow to pass in high inversion at the beginning of the transfer. These training charges are read with the charge-signal or collected with the charge-noise.
Abstract:
The storage capacity of the photosensitive points is increased during the time interval starting after the evacuation of the parasitic charges from the conductive columns to the memory and finishing by the transfer of signal charges from a row of the columns to the memory. Thus, even the overilluminated photosensitive points do not overflow onto the columns.
Abstract:
The present invention concerns an analysis process of a line transfer photosensitive device.The charge-signal and the charge noise transfers from the columns towards the memory have the same duration and are made by using a same training charge, stored in memory, that must be at least sufficient to allow to pass in high inversion at the beginning of the transfer from the columns towards the memory. The transfers of the charge-signal and the charge-noise from the memory towards the read-out register or the drain have the same duration and are made by using training charges at least sufficient to allow to pass in high inversion at the beginning of the transfer. These training charges are read with the charge-signal or collected with the charge-noise.
Abstract:
A device for reading a quantity of electric charges arriving at a point B. Two MOS transistors Q2 and Q3 are connected in series and with one terminal to point B. A capacitor C.sub.A is connected to a common point A of the two transistors. A transistor control circuit charges the capacitor C.sub.A from a low potential V.sub.DD. The capacitor C.sub.A and the transistors Q2 and Q3 maintain a constant potential at the point B at the time of charge inflow. This results is a variation of potential at the common point A in accordance with the incoming charges at B. Thus, the variations of potential at point A is a measure of the charges arriving at point B.
Abstract:
Packets of charges representing an electrical signal are injected into a semiconductor substrate by injection means comprising a diode and two electrodes. The charge packets are transferred to an output diode with a well-defined time-delay by means of electrodes which are disposed on the substrate and to which periodic transfer potentials are applied. The output diode also receives samples of the signal to be stored and is connected to an inverter which serves to regenerate and transmit the signal to the injection means.
Abstract:
The disclosure concerns matrices of photosensitive elements. To avoid the need for a resetting light source using, as a photosensitive dot, a photodiode in series with a capacitor between a row conductor and a column conductor, it is proposed, according to the invention, to provide for a photosensitive dot comprising three diodes (a photosensitive diode, a reading diode and a resetting diode) connected to a common floating node. In one embodiment, the anode of the photosensitive diode is connected to a row-addressing conductor giving a reading pulse to the selected line; the cathode of the reading diode is connected to the column conductor which collects the useful signal; and the anode of the resetting diode is connected to a second row conductor (which, besides, may be the first conductor of a neighbouring row) which receives a resetting pulse after the reading pulse. In another embodiment, the photosensitive diode is turned back, its cathode being then connected to a row conductor; the resetting diode is simply connected to a reference voltage source.
Abstract:
The invention relates to a photosensitive matrix (2) permitting the simultaneous acquisition of two images, especially radiological images, and which offers at the same time a maximum sensitivity and a maximum image resolution. The matrix (2) of the invention includes photosensitive points (P1 to P9) disposed in lines and in columns. According to a feature of the invention, each photosensitive point (P1 to 9) includes two photosensitive cells (JA, JB), the first ends (3A, 3B) of which are connected to a same line conductor (L1 to L3), and the second ends (4A, 4B) of which are connected to different column conductors. FIG. 1.
Abstract:
A charge transfer device having a first storage gate above a first storage region and a second storage gate above a second storage region. The charge duplicator has a first charge injector having a first passage gate which introduces, below the first storage gate, the reference charge to be duplicated. A second charge injector having a second passage gate is located near the second storage gate. The first storage gate and second storage gate are connected to the two inputs of a voltage comparator, the output of the voltage comparator being connected to the second passage gate. The charge duplicator has a mechanism which initially is used to apply a reference voltage to the two inputs of the voltage comparator, thereby leaving the two inputs and the gates connected to them in a floating state. The voltage comparator outputs a high level or low level, depending on the value of the differential voltage between its inputs. A very steep transition occurs between the two levels, which is as close to zero as possible.
Abstract:
Disclosed is a solid state photosensitive device having photosensitive dots, each of which achieves an amplification of the useful signal by means of a transistor obtained by a technology enabling the making photosensitive devices with large areas. To this end, according to the disclosure, each photosensitive diode has at least one photosensitive element that generates electrical charges stored at a point at floating potential, and has a transistor, the control gate of which is connected to the floating point. The transistor thus fulfils an amplifier function, but does not fulfill a photodetection function, so that it can be made of amorphous silicon, amorphous silicon being a material that can be used in thin layers or thin films on large areas.
Abstract:
A device for the electric scanning of luminous images. It includes a matrix of N lines and M columns of photosensitive points. A system incorporating a line memory of M points receives in parallel the electric charges supplied by the M points of the same line parasitic charge are removed by diodes. The system insures the injection of the same predetermined quantity of charges between each of the photosensitive points and the output of the device. An output shift register receives in parallel the charges supplied by the line memory and supplies in series a picture scanning electric signal. This device is particularly intended for use in a television camera.