# US 9,521,340 B2 · Apparatus and method for detecting a defective pixel

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- Number: US 9,521,340 B2
- Document ID: US9521340B2
- Status: Granted
- Kind: B2
- Application number: 14/825,448
- Filed: 2015-08-13
- Published: 2015-12-03
- Granted: 2016-12-13
- Earliest claimed: 2010-11-30
- Assignees: Sony Corporation
- Applicants: Sony Corporation
- Inventors: Tsutomu Nakajima
- Web page: https://patentgrep.com/patent/US9521340B2

## CPC

- H04N 17/002: {for television cameras}
- H04N 5/63: Generation or supply of power specially adapted for television receivers
- H04N 25/68: applied to defects
- H04N 25/71: Charge-coupled device [CCD] sensors; Charge-transfer registers specially adapted for CCD sensors
- H04N 25/77: Pixel circuitry, e.g. memories, A/D converters, pixel amplifiers, shared circuits or shared components
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

An image pickup device without a light shielding device for blocking light received by a solid-state image pickup element, the image pickup device including: a supplying section configured to supply a signal for resetting a charge of a floating diffusion disposed so as to correspond to one or a plurality of pixels in the solid-state image pickup element; and a detecting section configured to detect a pixel in which change in output of the pixel after passage of a certain time from the resetting of the charge of the floating diffusion is larger than a predetermined threshold value.

## Claims

### Claim 1

An image pickup device without a light shielding device that blocks light received by a solid-state image pickup element, the image pickup device comprising:
circuitry configured to:
supply a signal that resets a charge of a floating diffusion disposed so as to correspond to one or a plurality of pixels and a signal that resets a charge accumulated in a photodiode of a pixel in said solid-state image pickup element; and
detect said pixel in which a change in output of said pixel is larger than a predetermined threshold value in an event the charge accumulated in said photodiode is reset in a predetermined exposure time from the reset of the charge of said floating diffusion.

### Claim 2 (depends on 1)

The image pickup device of claim 1, wherein said circuitry is further configured to store an address that indicates a position of said detected pixel.

### Claim 3 (depends on 1)

The image pickup device of claim 1, wherein said circuitry is further configured to correct a pixel value read from said pixel based on a pixel value of a peripheral pixel on a periphery of said pixel.