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Image sensor integrated circuit

An image sensor and integrated circuit technology, applied in circuits, image communication, television, etc., can solve the problems of reset voltage spike noise changes, photodiode reset level fluctuations, and large signal level changes on the readout line. The effect of horizontal stripes

Inactive Publication Date: 2005-02-09
SEIKO INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, when the noise is based on the power supply voltage, the reset voltage also changes, so the reset level of the photodiode fluctuates every reset
Therefore, the signal level on each readout line changes, resulting in horizontal stripes on the readout image
[0008] In particular, when a low-cost switching power supply is used, the reset voltage varies severely due to the spike noise of the switching power supply, and as a result, the variation of the signal level on each readout line becomes larger

Method used

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Examples

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no. 1 example

[0035] figure 1 is a schematic diagram showing an image sensor IC according to an embodiment of the present invention. The image sensor IC 41 includes a signal processing circuit 42 , a photoelectric conversion device 43 , a reference voltage circuit 44 , a low-pass filter 45 , and a signal output terminal 47 . A common signal line of the photoelectric conversion device 43 is connected to the signal processing circuit 42 . The output of the signal processing circuit 42 is connected to a signal output terminal 47 .

[0036] Figure 15 is to use figure 1 A schematic diagram of a contact-type image sensor of the image sensor IC 41 is shown. This contact-type image sensor is composed of three image sensor ICs 41 . The signal output terminals 47 of the image sensor IC 41 are externally connected to each other. The output of the image sensor IC 41 is output from the VOUT2 terminal to the outside.

[0037] Figure 13 with 14 is a circuit diagram showing a reference voltage c...

no. 2 example

[0066] Figure 5 A schematic circuit diagram showing a photoelectric conversion device according to a second embodiment of the present invention. exist Figure 5 Elements included in the photoelectric conversion module An shown constitute one pixel. The channel selection switch 7 of each module is connected to the common signal line 11 . Note that the photoelectric conversion module An represents an n-bit photoelectric conversion module. image 3 A block diagram showing the overall configuration of the photoelectric conversion device 43 .

[0067] This module includes a photodiode 1 used as a photoelectric conversion section, transfer switches 14, 15, 16, and 17 used as a charge transfer section, a reset switch 2 used as a reset section, an amplifier section 3, a capacitor 13 for holding an optical signal , a capacitor 12 for holding a reference signal as a reference in the photoelectric conversion part, a MOS transistor 6 used as a signal readout part constituting a MOS s...

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PUM

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Abstract

Provided is an Image sensor for resolving a problem in that a transverse streak Is caused on a read image. The image sensor IC includes: a plurality of photoelectric conversion elements; a plurality of reset units for initializing the photoelectric conversion elements, which are respectively connected with the photoelectric conversion elements; a reference voltage circuit for generating a reset voltage supplied to the reset means; and a low pass filter provided between the reset units and the reference voltage circuit.

Description

technical field [0001] The present invention relates to a photoelectric conversion device which receives reflected light of light irradiated on an original document and converts the received reflected light into an electric signal. In particular, the present invention relates to a linear image sensor integrated circuit (IC) suitable for an image reading device such as a facsimile machine or an image scanner, and a contact type image sensor on which a large number of image sensor ICs are mounted. In addition, the present invention also relates to an area image sensor IC. Background technique [0002] FIG. 16 is a circuit diagram showing an image sensor IC used in a conventional image reading apparatus, and FIG. 17 is a timing chart of the image sensor IC (see JP 11-239245 A, for example). [0003] The N-type region of the photodiode 101 is connected to the positive power supply voltage terminal VDD, and its P-type region is connected to the drain of the reset switch 102 and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L27/146H01L31/10H04N1/028
CPCH04N5/3698H04N5/374H04N5/3577H04N25/617H04N25/709H04N25/76
Inventor 町田聪
Owner SEIKO INSTR INC