Solid-state imaging device

Abstract

A solid-state imaging element is provided with a light-sensing cell array containing multiple light-sensing cells, and a spectroscopic element array containing multiple spectroscopic elements. The light-sensing cell array is configured from multiple unit blocks (40), and each unit block (40) has four light-sensing cells (2a, 2b, 2c, 2d). Moreover, a light-collecting element (4c) is disposed on a region covering light-sensing cells (2a and 2b). The light-collecting element (4c) collects the incident light onto light-sensing cells (2a and 2b).

Description

technical field [0001] The present application relates to techniques for increasing sensitivity and colorization of solid-state imaging devices. Background technique [0002] In recent years, digital cameras and digital video cameras using solid-state imaging devices such as CCDs and CMOSs ​​(hereinafter sometimes referred to as "imaging devices") have become astonishingly high in functionality and performance. In particular, the miniaturization of the pixel structure in an imaging device is progressing along with the rapid progress of semiconductor manufacturing technology. As a result, high integration of pixels and driving circuits of the imaging element can be realized, and the performance of the imaging element is promoted. In particular, in recent years, cameras using a back side illumination imaging element that receives light not on the surface (surface) side on which the wiring layer of the solid-state imaging element is formed but on the back side have also been o...

AI Technical Summary

Problems solved by technology

[0021] In the prior art, if a light-absorbing color filter is used, although there is no need to greatly increase the number of photosensitive elements, there is a problem that the light utilization rate becomes low.

In addition, as in the techniques disclosed in Patent Documents 2 to 4, if dichroic mirrors and microprisms are used, light utilization efficiency can be improved, but there is a problem that photosensitive elements must be greatly increased.

[0022] On the other hand, according to the technology disclosed in Patent Document 5, although theoretically a color image with high light utilization efficiency can be surely obtained, in this technology, it is assumed that the incident light toward the imaging element is perpendicular to the imaging surface, so in practice When this technique is applied to a camera with a wide range of cameras, the occurrence of oblique light due to the amount of aperture of the lens becomes noticeable

As a result, there is a problem that the crosstalk of incident light toward each photosensitive element increases, and errors occur in color signal components.

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