JPH056985A - Solid-state image sensing device - Google Patents
Solid-state image sensing deviceInfo
- Publication number
- JPH056985A JPH056985A JP3156676A JP15667691A JPH056985A JP H056985 A JPH056985 A JP H056985A JP 3156676 A JP3156676 A JP 3156676A JP 15667691 A JP15667691 A JP 15667691A JP H056985 A JPH056985 A JP H056985A
- Authority
- JP
- Japan
- Prior art keywords
- light receiving
- color
- receiving elements
- solid
- elements
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はカラーイメージセンサの
ような固体撮像装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid-state image pickup device such as a color image sensor.
【０００２】[0002]
【従来の技術】カラーイメージセンサは、Ｒ（赤色）、
Ｇ（緑色）およびＢ（青色）の光に対して、それぞれ感
度を有する画素を配置して構成される。すなわち、半導
体基板の受光面にはｐｎ接合を有するフォトダイオード
が多数形成され、その前面にはＲ、Ｇ、Ｂの３色フィル
タ、あるいは補色フィルタなどの波長選択フィルタが設
けられる。そして、Ｒ、Ｇ、Ｂの各々の信号出力は、電
荷転送部を介して、あるいはＭＯＳスイッチと信号線を
介して、所定の順番で読み出される。2. Description of the Related Art A color image sensor is R (red),
Pixels having sensitivity to G (green) light and B (blue) light are arranged. That is, a large number of photodiodes having a pn junction are formed on the light receiving surface of the semiconductor substrate, and a wavelength selection filter such as a three-color filter of R, G, B or a complementary color filter is provided on the front surface thereof. Then, the R, G, and B signal outputs are read out in a predetermined order via the charge transfer section or via the MOS switch and the signal line.
【０００３】ところで、フォトダイオードの感度は波長
が異なると当然に異なり、一般にはＢに対する感度は低
いので、色バランスが適正にとれない。そこで、特開昭
６２−４２６９０号では、Ｒ、ＧおよびＢのフォトダイ
オードの面積（受光面積）を異ならせることにより、感
度の波長依存性が出力のアンバランスとならないように
している。このＣＣＤイメージセンサにおける色バラン
スの調整技術を、ＭＯＳスイッチと信号線を介して出力
を読み出すアドレス読出方式のイメージセンサに適用し
て説明すると、図３のようになる。By the way, the sensitivity of the photodiode is naturally different when the wavelength is different, and the sensitivity to B is generally low, so that the color balance cannot be properly maintained. Therefore, in Japanese Patent Laid-Open No. 62-42690, the area of the R, G and B photodiodes (light receiving area) is made different so that the wavelength dependence of sensitivity does not cause an output imbalance. The color balance adjusting technique in this CCD image sensor is applied to an image sensor of an address reading system for reading out an output through a MOS switch and a signal line, and it will be described as shown in FIG.
【０００４】同図に示す通り、画素１０は赤色受光部１
１Ｒと緑色受光部１１Ｇと青色受光部１１Ｂを有して構
成され、各々の受光部１１Ｒ、Ｇ、ＢはＭＯＳスイッチ
２Ｒ、Ｇ、Ｂを介して読出信号線３Ｒ、Ｇ、Ｂに接続さ
れている。ここで、同図（ａ）のように、各色の受光部
１１Ｒ、Ｇ、Ｂの受光面積が同一であると、受光部１１
Ｒ、Ｇ、Ｂを構成するフォトダイオードの分光感度ある
いは各フィルタの分光透過率に依存して、出力のレベル
がＲ、Ｇ、Ｂの色ごとに異なってしまう。そこで、同図
（ｂ）のように、感度の高い赤色については受光部１１
Ｒの受光面積を小さくし、感度の低い青色については受
光部１１Ｂの受光面積を大きくすることで、上記の不均
一を除去することができる。As shown in FIG. 1, the pixel 10 includes a red light receiving portion 1
1R, a green light receiving portion 11G and a blue light receiving portion 11B are provided, and each light receiving portion 11R, G, B is connected to the read signal lines 3R, G, B via the MOS switches 2R, G, B. There is. Here, if the light receiving areas of the light receiving sections 11R, G, and B of the respective colors are the same as shown in FIG.
Depending on the spectral sensitivity of the photodiodes forming R, G, and B or the spectral transmittance of each filter, the output level differs for each of R, G, and B colors. Therefore, as shown in FIG. 7B, the light receiving unit 11 is used for red with high sensitivity.
The unevenness can be eliminated by reducing the light receiving area of R and increasing the light receiving area of the light receiving portion 11B for blue, which has low sensitivity.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記の
図３（ｂ）に示すようなカラーイメージセンサでは、例
えば同一スポットサイズの白色光が同一の画素１０に入
射された場合でも、これを色バランス良く検出できない
ことがある。例えば、白色光のスポットが図４（ａ）の
ように、受光部１１Ｒ、Ｇ、Ｂの全てを含むときには、
適正に検出されるが、同図（ｂ）のようにＲ側に偏位し
たときにはＲ、Ｇの出力が大きくなり、同図（ｃ）のよ
うにＢ側に偏位したときには、Ｂの出力が大きくなって
Ｒ、Ｇの出力が小さくなってしまう。However, in the color image sensor as shown in FIG. 3 (b), even if white light having the same spot size is incident on the same pixel 10, the color balance is adjusted. It may not be detected well. For example, when the spot of white light includes all the light receiving units 11R, G, and B as shown in FIG. 4A,
Although properly detected, the outputs of R and G become large when it is deviated to the R side as shown in FIG. 7B, and the output of B is deviated to the B side as shown in FIG. Becomes larger and the output of R and G becomes smaller.
【０００６】本発明は、かかる従来技術の欠点を解決す
るためになされたもので、色バランスを微細な領域にお
いても調整可能にした固体撮像装置を提供することを目
的とする。The present invention has been made in order to solve the drawbacks of the prior art, and an object thereof is to provide a solid-state image pickup device in which the color balance can be adjusted even in a fine area.
【０００７】[0007]
【課題を解決するための手段】本発明は、複数の画素を
備える固体撮像装置において、異なる複数種類の入射光
（例えばＲ、Ｇ、Ｂの光）の各々に対して信号出力を生
成する波長ごとの複数の受光部を有して構成され、複数
の受光部の各々は、互いに受光面積が略同一であって波
長に対する感度に応じて数の異なる複数の受光要素を混
在して形成されている。According to the present invention, in a solid-state image pickup device having a plurality of pixels, a wavelength for generating a signal output for each of a plurality of different types of incident light (for example, R, G, B light). Each of the plurality of light receiving portions is formed by mixing a plurality of light receiving elements having substantially the same light receiving area and different in number depending on the sensitivity to the wavelength. There is.
【０００８】[0008]
【作用】本発明によれば、各色の受光部は更に小さな受
光要素に分割され、混在して配置される。ここで、各々
の受光要素の受光面積は略同一であるので、各色の分光
感度に応じてその数を異ならせることで、各色の全体の
受光面積を調整できる。According to the present invention, the light receiving portions for the respective colors are divided into smaller light receiving elements and are arranged in a mixed manner. Here, since the light receiving areas of the respective light receiving elements are substantially the same, the total light receiving area of each color can be adjusted by varying the number according to the spectral sensitivity of each color.
【０００９】[0009]
【実施例】以下、添付図面により本発明の実施例を説明
する。なお、同一の要素には同一の符号を付する。Embodiments of the present invention will be described below with reference to the accompanying drawings. The same elements are designated by the same reference numerals.
【００１０】図１は第１実施例に係るアドレス読出方式
のカラーイメージセンサの平面図である。図示の通り、
赤色の受光部１１Ｒは３個の受光要素１２Ｒ1 〜１２Ｒ
3 で構成され、緑色の受光部１１Ｇは６個の受光要素１
２Ｇ1 〜１２Ｇ6 で構成され、青色の受光部１１Ｂは１
２個の受光要素１２Ｂ1 〜１２Ｂ12で構成されている。
そして、これらＲ、Ｇ、Ｂの受光要素１２は、それぞれ
短冊状とされ、混在するように配設されている。赤色の
受光部１１Ｒ1 〜１１Ｒ3 は信号線（要素間配線）を介
してＭＯＳスイッチ２Ｒに接続され、更に読出信号線３
Ｒに接続されており、赤色以外のＭＯＳスイッチ２Ｇと
読出信号線３ＧおよびＭＯＳスイッチ２Ｂと読出信号線
３Ｂについても同様になっている。FIG. 1 is a plan view of an address read type color image sensor according to the first embodiment. As shown,
Red light receiving section 11R are three light-receiving elements 12R 1 ~12R
Is composed of 3, green light receiving section 11G is six light receiving elements 1
It is composed of 2G 1 to 12G 6 and the blue light receiving portion 11B is 1
It is composed of two light receiving elements 12B 1 to 12B 12 .
The R, G, and B light-receiving elements 12 are strip-shaped and are arranged so as to be mixed. The red light receiving portions 11R 1 to 11R 3 are connected to the MOS switch 2R via signal lines (inter-element wiring), and further read signal lines 3
The same applies to the MOS switch 2G and the read signal line 3G other than the red color and the MOS switch 2B and the read signal line 3B which are connected to R.
【００１１】上記実施例によれば、短冊の受光要素１２
Ｒ、Ｇ、Ｂの各々は、受光面積が略同一であるが、その
数が異なっており、Ｒ、Ｇ、Ｂの各々の画素１０Ｒ、
Ｇ、Ｂあたりの受光面積が分光感度に応じたものとなっ
ている。このため、色バランスを適正にしながら、入射
光の位置などによって、微妙に色バランスが崩れるよう
なことが無くせる。そして、信号の読み出しにあたって
は、図示しない走査回路からの信号により、ＭＯＳスイ
ッチ２Ｒ、Ｇ、Ｂを個々の画素１０ごとにオンさせれば
よい。これにより、読出信号線３Ｒ、Ｇ、Ｂより各色の
ビデオ信号を出力できる。According to the above embodiment, the strip light receiving element 12 is provided.
Each of R, G, and B has substantially the same light-receiving area, but the numbers thereof are different.
The light receiving area per G and B corresponds to the spectral sensitivity. Therefore, it is possible to prevent the color balance from being delicately broken depending on the position of the incident light and the like while the color balance is being adjusted appropriately. In reading the signal, the MOS switch 2R, G, B may be turned on for each pixel 10 by a signal from a scanning circuit (not shown). As a result, the video signal of each color can be output from the read signal lines 3R, G, B.
【００１２】図２は第２実施例に係るカラーイメージセ
ンサの平面図である。この実施例では、受光要素１２
Ｒ、Ｇ、Ｂの受光面は正方形とされ、碁盤目状に混在し
て配置されている。各色の受光要素１２Ｒ、Ｇ、Ｂの相
互間は、要素間配線４によって接続されている。この実
施例によれば、要素間配線４によって開口率がある程度
低下することがあるが、色バランスにより微細に調節す
ることができる。なお、信号の読み出しについては、第
１実施例と同様である。FIG. 2 is a plan view of a color image sensor according to the second embodiment. In this embodiment, the light receiving element 12
The R, G, B light-receiving surfaces are square and are arranged in a grid pattern. The light receiving elements 12R, G, B of each color are connected to each other by an interelement wiring 4. According to this embodiment, although the aperture ratio may be lowered to some extent by the inter-element wiring 4, it can be finely adjusted by the color balance. The signal reading is the same as in the first embodiment.
【００１３】[0013]
【発明の効果】以上の通り、例えばＲ、Ｇ、Ｂの各色の
受光部は更に小さな受光要素に分割され、混在して配置
される。ここで、各々の受光要素の受光面積は略同一で
あるので、各色の分光感度に応じてその数を異ならせる
ことで、各色の全体の受光面積を調整できる。このた
め、色バランスを微妙に調整したカラーイメージセンサ
を提供できる。As described above, for example, the light receiving portions of R, G, and B colors are divided into smaller light receiving elements and are arranged in a mixed manner. Here, since the light receiving areas of the respective light receiving elements are substantially the same, the total light receiving area of each color can be adjusted by varying the number according to the spectral sensitivity of each color. Therefore, it is possible to provide a color image sensor whose color balance is finely adjusted.
【図１】第１実施例に係るアドレス読出し方式のカラー
イメージセンサの平面図である。FIG. 1 is a plan view of an address read type color image sensor according to a first embodiment.
【図２】第２実施例に係るアドレス読出し方式のカラー
イメージセンサの平面図である。FIG. 2 is a plan view of an address read type color image sensor according to a second embodiment.
【図３】従来例とその改良に係るアドレス読出し方式の
カラーイメージセンサの平面図である。FIG. 3 is a plan view of an address read type color image sensor according to a conventional example and its improvement.
【図４】図３（ｂ）のカラーイメージセンサの問題点を
示す図である。FIG. 4 is a diagram showing a problem of the color image sensor of FIG. 3 (b).
１…画素 ２…受光部 ３…受光要素 ４…ＭＯＳスイッチ ５…読出信号線 ６…要素間配線 1 ... Pixel 2 ... Light receiving part 3 ... Light receiving element 4 ... MOS switch 5 ... Read signal line 6 ... Wiring between elements
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０４Ｎ 1/028 Ｃ 9070−5Ｃ 9/07 Ａ 8943−5Ｃ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI Technical indication H04N 1/028 C 9070-5C 9/07 A 8943-5C
Claims (3)
て、前記複数の画素のそれぞれは、互いに波長の異なる
複数種類の入射光の各々に対して信号出力を生成する前
記波長ごとの複数の受光部を有して構成され、前記複数
の受光部の各々は、互いに受光面積が略同一であって前
記波長に対する感度に応じて数の異なる複数の受光要素
を混在して形成されていることを特徴とする固体撮像装
置。1. A solid-state imaging device having a plurality of pixels, wherein each of the plurality of pixels generates a signal output for each of a plurality of types of incident light having different wavelengths from each other. Each of the plurality of light receiving portions has a substantially same light receiving area and is formed by mixing a plurality of light receiving elements having different numbers according to the sensitivity to the wavelength. Solid-state imaging device.
びＢの３色のいずれかに対して感度を有する請求項１記
載の固体撮像装置。2. The solid-state imaging device according to claim 1, wherein each of the plurality of light receiving units has sensitivity to any of three colors of R, G and B.
成されたフォトダイオードと、このフォトダイオードに
設けられた波長選択フィルタによって形成されている請
求項１記載の固体撮像装置。3. The solid-state imaging device according to claim 1, wherein the plurality of light receiving elements are formed by a photodiode formed on a semiconductor substrate and a wavelength selection filter provided on the photodiode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3156676A JPH056985A (en) | 1991-06-27 | 1991-06-27 | Solid-state image sensing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3156676A JPH056985A (en) | 1991-06-27 | 1991-06-27 | Solid-state image sensing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH056985A true JPH056985A (en) | 1993-01-14 |
Family
ID=15632884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3156676A Pending JPH056985A (en) | 1991-06-27 | 1991-06-27 | Solid-state image sensing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH056985A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016181932A (en) * | 2014-04-22 | 2016-10-13 | オプティツ インコーポレイテッド | Color filter and photodiode patterning configuration |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5634183A (en) * | 1979-08-22 | 1981-04-06 | Fujitsu Ltd | Semiconductor memory unit |
| JPS5859666A (en) * | 1981-10-06 | 1983-04-08 | Oki Electric Ind Co Ltd | Picture image processor |
| JPS61255191A (en) * | 1985-05-08 | 1986-11-12 | Fuji Photo Film Co Ltd | Accumulation type color image sensor |
| JPS62289087A (en) * | 1986-06-09 | 1987-12-15 | Seiko Epson Corp | Solid-state image pickup element |
-
1991
- 1991-06-27 JP JP3156676A patent/JPH056985A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5634183A (en) * | 1979-08-22 | 1981-04-06 | Fujitsu Ltd | Semiconductor memory unit |
| JPS5859666A (en) * | 1981-10-06 | 1983-04-08 | Oki Electric Ind Co Ltd | Picture image processor |
| JPS61255191A (en) * | 1985-05-08 | 1986-11-12 | Fuji Photo Film Co Ltd | Accumulation type color image sensor |
| JPS62289087A (en) * | 1986-06-09 | 1987-12-15 | Seiko Epson Corp | Solid-state image pickup element |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016181932A (en) * | 2014-04-22 | 2016-10-13 | オプティツ インコーポレイテッド | Color filter and photodiode patterning configuration |
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