Output-compensating device for image sensor

H - Electricity – 01 – L

Patent

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Details

H01L 27/146 (2006.01) H04N 5/335 (2006.01) H04N 3/15 (2006.01) H04N 5/217 (2006.01)

Patent

CA 2428996

Is disclosed an output compensating device capable of optimally compensating output signals of an image sensor composed of a number of light-sensor circuits, each of which represents a unit pixel and is capable of producing in a photoelectric converting element a sensor current proportional to a quantity of light falling thereon, converting the current into a voltage signal by a MOS type transistor with a logarithmic output characteristic in a weak inverse state, initializing itself by removing a charge accumulated in a parasitic capacity of the photoelectric converting element by changing a drain voltage of the transistor to a value lower than a normal value for a specified time and outputting a pixel signal having a logarithmic characteristic at a large quantity of the sensor current and a pixel signal having a non-logarithmic characteristic at a small quantity of the sensor current. This device has a means for compensating each pixel signal from the image sensor for an offset value and outputting a resulting signal if said signal has an output characteristic within a logarithmic response region or a non-logarithmic region depending on the output condition and, if not, further compensating the offset-compensated signal for its gain and outputting a resulting signal, thus ensuring the optimal compensation of each pixel signal of the image sensor in accordance with its output state.

L'invention concerne un dispositif utilisé dans un capteur d'images composé de capteurs optiques équipés de pixels respectifs et conçus pour générer un signal d'image avec une caractéristique de réponse logarithmique lorsque le courant du capteur est élevé et avec une caractéristique de réponse non logarithmique lorsque le courant du capteur est faible. Ce dispositif est destiné à soumettre le signal d'image de chaque pixel, généré par le capteur d'image, à une correction de décalage. Le signal de décalage est généré en l'état lorsque le signal d'image est compris dans une zone de réponse logarithmique ou dans une zone de réponse non logarithmique ou le signal de décalage est soumis à une correction de gain, puis généré lorsque le signal d'image est compris dans la zone non logarithmique. Par conséquent, ce dispositif est utilisé pour obtenir la correction de sortie la plus adéquate en fonction de l'état de sortie du signal d'image de chaque pixel du capteur d'images. FIG. 11 7 CAPTEUR D'IMAGE 9 CONVERTISSEUR A/N 10 MEMOIRE 11 CIRCUIT DE CORRECTION DE SORTIE 111 SECTION DE CORRECTION DE DECALAGE 112 SECTION DE CORRECTION DE GAIN

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