Amplification type solid-state image pickup device and driving method therefor

a solid-state image and pickup device technology, applied in the direction of television systems, elevators, radio control devices, etc., can solve the problems of reducing the charge-voltage conversion efficiency , achieve the effect of reducing the transistor count per pixel, reducing noise, and miniaturizing the pixel siz

Inactive Publication Date: 2005-07-28
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0015] Accordingly, an object of the present invention is to provide an amplification type solid-state image pickup device, as well as a driving metho

Problems solved by technology

However, with the technique of JP H09-46596A, there would arise problems as shown below.
Therefore, the capacitance CFD increases with increasing number of pixels (photodi

Method used

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  • Amplification type solid-state image pickup device and driving method therefor
  • Amplification type solid-state image pickup device and driving method therefor
  • Amplification type solid-state image pickup device and driving method therefor

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Embodiment Construction

[0075] Hereinbelow, an amplification type solid-state image pickup device and a driving method therefor of the present invention are described in detail by reference to an embodiment shown in the accompanying drawings.

[0076]FIG. 1 is a circuit diagram showing part of a two-dimensional amplification type solid-state image pickup device according to an embodiment of the present invention. The two-dimensional amplification type solid-state image pickup device includes a plurality of pixels 10 each having a buried photodiode 1 as a photoelectric conversion element and a transfer transistor 2 for transferring signal charge of the photodiode 1. Those pixels 10 are arrayed two-dimensionally in a matrix, and divided into pixel groups X(n−1), X(n), X(n+1), . . . (hereinafter, referred to generically as pixel groups X when appropriate) each of which is composed of k pixels (where k≧2) in each column. It is noted that FIG. 1 shows in detail the n-th pixel group X(n) in one column (the 1st col...

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Abstract

A plurality of pixel groups X(n) each comprising a plurality of pixels are set, and switched capacitor amplification parts are provided in correspondence to the pixel groups, respectively. Each of the switched capacitor amplification parts has a charge detection node to which output terminals of the transfer transistors of a corresponding pixel group X(n) are connected in common, an amplification part, a reset transistor, a first capacitance element, and a select transistor. A load part common to the switched capacitor amplification parts is provided. The load part is combined with the amplification parts of the switched capacitor amplification parts to constitute inverting amplifiers, respectively. By means of the above constitution, it is capable of obtaining a noise-reduced, high-quality image and which allows transistor count per pixel to be cut, thus allowing the pixel size to be reduced.

Description

[0001] This nonprovisional application claims priority under 35 U.S.C. §119(a) on Patent Application No. 2004-019782 filed in Japan on Jan. 28, 2004, the entire contents of which are hereby incorporated by reference. BACKGROUND OF THE INVENTION [0002] The present invention relates to an amplification type solid-state image pickup device and a driving method therefor. More specifically, the invention relates to an amplification type solid-state image pickup device, as well as a driving method therefor, which includes a plurality of pixels each having a photoelectric conversion element and a transfer transistor for transferring signal charge of the photoelectric conversion element, where signals derived from the individual pixels are amplified and outputted to a signal line in common to the pixels. [0003] Generally, there has been wide-spreading an amplification type solid-state image pickup device which has a pixel part provided with an amplification function and a scanning circuit d...

Claims

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Application Information

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IPC IPC(8): H04N5/335H04N5/357H01L27/146H04N5/369H04N5/374H04N5/3745
CPCH04N3/155H04N25/59H04N25/778B66B3/002B66B2201/40
Inventor KOYAMA, EIJIWATANABE, TAKASHI
Owner SHARP KK
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