WO2008116812A1 - Capteur optique à filtre couleur adaptatif - Google Patents

Capteur optique à filtre couleur adaptatif Download PDF

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Publication number
WO2008116812A1
WO2008116812A1 PCT/EP2008/053332 EP2008053332W WO2008116812A1 WO 2008116812 A1 WO2008116812 A1 WO 2008116812A1 EP 2008053332 W EP2008053332 W EP 2008053332W WO 2008116812 A1 WO2008116812 A1 WO 2008116812A1
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WO
WIPO (PCT)
Prior art keywords
sensor
cell
color filter
color
sensor according
Prior art date
Application number
PCT/EP2008/053332
Other languages
German (de)
English (en)
Inventor
Christian Schirp
Andreas Pirchner
Original Assignee
Leopold Kostal Gmbh & Co. Kg
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Leopold Kostal Gmbh & Co. Kg filed Critical Leopold Kostal Gmbh & Co. Kg
Publication of WO2008116812A1 publication Critical patent/WO2008116812A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
    • H01L27/144—Devices controlled by radiation
    • H01L27/146—Imager structures
    • H01L27/14601—Structural or functional details thereof
    • H01L27/1462—Coatings
    • H01L27/14621—Colour filter arrangements

Definitions

  • the invention relates to a camera sensor with a sensor array composed of individual optoelectronic transducer elements (pixels) and an optical system for imaging on the photosensitive surface of the pixels of the sensor array.
  • camera sensors are used which work on a black-and-white basis and with which a grayscale image can be generated.
  • camera sensors which have a two-dimensional array of optoelectronic transducer elements as a photosensitive sensor array and an upstream optics, there is a detection of the vehicle environment, in particular looking forward in the direction of travel.
  • a dimming of the high beam is controlled when an oncoming motor vehicle is detected.
  • S / W camera sensor it is not clear whether detected points of light are assigned to headlights of an oncoming vehicle or the taillights of a preceding vehicle.
  • the invention is therefore based on the object of proposing a camera sensor, in particular for use in a driver assistance system of a motor vehicle, with the color information can be obtained with the use of an S / W camera sensor, without disadvantages in terms of resolving power or having to use two parallel systems as described in EP 1 084 051 B1.
  • an electrically switchable optical color filter is switched on in the beam path for exposing the transducer elements.
  • This is a translucent cell changing its color state as a function of the concern of an electric field.
  • Such a cell may be turned on in the beam path for exposing each transducer element of the sensor array.
  • such a cell can also extend over a plurality of pixels of the sensor array or, in particular if it is switched on directly into the optical path of the optical system, can be arranged to act on a larger area or on the entire sensor array.
  • Is such as Optically switchable color filter associated with each pixel of the sensor array it is sufficient if the cell has translucent properties.
  • the cell is switched on in the optics of the beam path of the camera sensor and thus acts on an area or the entire sensor array, the cell is made transparent.
  • Suitable for use are, for example, those cells which are designed to work by utilizing the electrical capillary effect.
  • Such cells are so-called electrowetting cells.
  • Such a cell is constructed in the manner of a condenser, wherein the space between the electrodes is filled with a hydrophobic liquid, in particular oil and with water.
  • a hydrophobic liquid in particular oil and with water.
  • One of the two electrodes is hydrophobic coated. If there is no electric field, the oil will coat the hydrophobically coated electrode as a film. On the other hand, if there is an electric field, the surface tension changes, so that the water displaces the oil film. It is essential that in such a cell, two immiscible liquids are included.
  • the oil film is colored and represents the desired color filter.
  • red colored oil will be used to provide a red filter.
  • Such cells have a very rapid reaction time, so that in a short time successively two shots, for example, the preceding vehicle environment can be made.
  • a first image of such a recording pair is made with the electric field switched on and thus without the filter, while the other image is taken without any electric field applied to the cells and then to the color filter provided by the oil film.
  • this camera sensor In contrast to a color camera sensor, this camera sensor, which in the context of a driver assistance system does not necessarily have to show video qualities as far as the image sequence is concerned, obtains the color information in a short time in succession rather than simultaneously. Electrowetting cells are fast switching and even meet the requirements of video quality, so that in the end with this camera sensor even in this regard hardly any losses have to be accepted. It is essential that is not affected by the desired and obtained color information, the resolution of such a sensor.
  • each individual cell of such a multi-color filter cell is addressed as a subcell in the context of these embodiments.
  • the subcells are expediently controllable independently of each other, so that not only color information relating to the color of the respective oil of a subcell can be obtained, but also color information corresponding to the mixed color of two or more subcarriers connected in series.
  • Electrowetting cells can also be made in such a size that they are suitable to be incorporated into the optical path of the optic itself. Similarly, such an electrically switchable color filter cell and the optics can be directly upstream or downstream. At this point too, it is possible to increase the color information to be obtained with an S / W camera sensor by using composite multicolor filter cells and by having the individual subcells color filters of different colors.
  • FIG. 1 is a schematic sectional view of a detail of a camera sensor with a color filter matrix, formed from individual electrically switchable optical color filters and
  • FIG 2 shows another camera sensor with an electrically switchable optical color filter which is switched into the beam path in the region of the optical system.
  • An S / W camera sensor 1 has a sensor array 2 constructed from a multiplicity of individual optoelectronic transducer elements (pixels) 3 arranged in a two-dimensional arrangement relative to one another.
  • FIG shows only a section of the camera sensor 1, in particular without a sensor array 2 upstream optics. Due to the necessary releases for the electrical connections of the pixels 3, the photosensitive surface of such a pixel 3 is limited to a region thereof.
  • the photosensitive surface of the pixels 3 is identified by the reference numeral 4 in FIG.
  • the sensor array 2 of the camera sensor 1 is covered with an electrode 5 in the region of its pixels 3.
  • the electrode 5 is translucent.
  • the electrode 5 is already part of a color filter matrix identified overall by the reference numeral 6 in FIG.
  • the color filter matrix 6 further comprises a layer 7 having hydrophobic properties applied to the electrode 5.
  • the layer 7 not only has hydrophobic properties, but also serves as an electrical insulator. Therefore, the layer 7 can be continuously applied to the spaced-apart electrodes 5 of the individual pixels 3.
  • a further electrode 8 is arranged complementary to the electrodes 5 of each pixel 3. These, like the electrode 5 and also the hydrophobic insulation layer 7, are transparent.
  • the electrodes 8 have a region which can be addressed as a discharged electrode surface 9. At the end, the gap between the electrodes 8 and the insulating layer 7 is closed.
  • the space between the electrodes 8 and the hydrophobic layer 7 is filled with oil 10 and water 11.
  • the oil 10 is colored, in the illustrated embodiment red.
  • the water 11 displaces that on the hydrophobic one Layer 7 adjacent oil film, since the applied electric field cancels the polarization of the dipoles in the water surface.
  • the oil 10 is then forced sideways, into the discharged electrode area 9.
  • the omitted electrode area 9 is located in the direction of the beam path above those areas which are not associated with the photosensitive area 4 of a pixel 3.
  • the pixel 3 shown on the right in FIG. 1 is therefore exposed in the switching position of the color filter shown without the color filter switched on. While the pixel 3 shown on the left in FIG. 1 shows the color filter in its on position, it is reproduced in the right pixel 3 in its off position.
  • the individual cells of the color filter matrix 6 are electrowetting cells, and thus those cells which change their color state with respect to an exposure of the sensor array 2 of the camera sensor 1 as a function of the application of an electric field.
  • the control of the individual cells of the color filter matrix 6 takes place in the illustrated embodiment individually and thus pixel dependent. Therefore, individual cells or cell groups of the color filter matrix 6 can be switched independently of other areas of the sensor array 2 in one or the other filter position. Depending on the desired information that is to be obtained by the camera sensor 1, it may be sufficient if all cells of the color filter matrix 6 are switched simultaneously and thus parallel to one another.
  • the individual addressable cells (color filters) in the color filter matrix 6 offer the possibility of an evaluation in such a way that the color information is read out only by regions of interest or even by individual pixels, but not by others. This allows in connection with a driver assistance system better distinction, for example, between taillight-related reflections on wet roads and lane markings. Likewise, this makes it possible to run a filter bar over the image in the manner of a "rolling shutter.”
  • FIG. In contrast to the camera sensor 1 of FIG. 1, in the case of this camera sensor 13, an electrically switchable color filter, designed as an electrowetting cell 12, is switched on in the beam path.
  • the electrowetting cell 12 is associated with the optics 14 of the camera sensor 13.
  • the sensor array of the camera sensor 13 is identified by the reference numeral 15 in FIG.
  • the sensor array 15 is likewise a two-dimensionally constructed black-and-white sensor array, as already described for the exemplary embodiment of FIG.
  • the electrowetting cell 12 is constructed like the cells of the color filter matrix 6 described for the embodiment of Figure 1.
  • the electrowetting cell 12 is transparent in the embodiment of Figure 2 both in its color filter position and in its other position. By the color filter 12, the entire sensor array 15 is influenced in the illustrated embodiment of Figure 2, so that from the sensor array 15 either an image with activated color filter or without switched color filter can be made.
  • the electrowetting cell 12 does not need to be overly large in the optics 14 of the camera sensor 13, or by being connected upstream or downstream, in a skilful arrangement thereof.
  • the description of the invention makes it clear that having to accept with simple means without sacrificing the resolving power of a black and white sensor array, it is also possible to obtain color information, for example those needed in connection with a driver assistance system of a motor vehicle , Therefore, in a particularly preferred embodiment, the camera sensor is part of such a driver assistance system.

Abstract

Capteur optique (1) comprenant un réseau capteur (2) formé d'éléments convertisseurs individuels optoélectroniques (pixels) (3). Ce capteur de caméra (1) présente en outre une optique destinée à la reproduction, sur la surface photosensible (4), des pixels (3) du réseau capteur (2). Au moins une cellule transparente, modifiant sa couleur en fonction de l'application d'un champ électrique, est intercalée, en tant que filtre couleur optique pouvant être commuté électriquement, dans ce capteur à caméra (1), dans le faisceau d'éclairage de la surface photosensible (4) des éléments convertisseurs (3) du réseau capteur (2).
PCT/EP2008/053332 2007-03-23 2008-03-19 Capteur optique à filtre couleur adaptatif WO2008116812A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007014126.4 2007-03-23
DE102007014126A DE102007014126A1 (de) 2007-03-23 2007-03-23 Optischer Sensor

Publications (1)

Publication Number Publication Date
WO2008116812A1 true WO2008116812A1 (fr) 2008-10-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/053332 WO2008116812A1 (fr) 2007-03-23 2008-03-19 Capteur optique à filtre couleur adaptatif

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DE (1) DE102007014126A1 (fr)
WO (1) WO2008116812A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009021638B4 (de) 2009-05-16 2020-02-20 Leopold Kostal Gmbh & Co. Kg Optischer Sensor
EP2560364A1 (fr) * 2011-08-17 2013-02-20 Autoliv Development AB Système et méthode d'assistance à la conduite d'un véhicule motorisé
DE102011081358A1 (de) * 2011-08-23 2013-02-28 Robert Bosch Gmbh Verfahren und Vorrichtung zum Anpassen einer Filtereigenschaft eines adaptiven Farbfilters und zum Betreiben eines Bildaufnehmers

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997008897A1 (fr) * 1995-08-23 1997-03-06 Smith & Nephew, Inc. Systeme d'affichage video a distance equipe d'un filtre colore a cristaux liquides
WO1999064267A1 (fr) * 1998-06-09 1999-12-16 Gentex Corporation Systeme d'imagerie utile pour commander les phares avant d'un vehicule
WO2004027489A1 (fr) * 2002-09-19 2004-04-01 Koninklijke Philips Electronics N.V. Element optique commutable
US20060177098A1 (en) * 1997-04-02 2006-08-10 Stam Joseph S System for controlling exterior vehicle lights
US20070019006A1 (en) * 2005-07-12 2007-01-25 Marcu Gabriel G Subtractive display

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4967264A (en) * 1989-05-30 1990-10-30 Eastman Kodak Company Color sequential optical offset image sampling system
JP4402358B2 (ja) * 2003-03-05 2010-01-20 キヤノン株式会社 カラー画像表示パネルおよびその駆動方法
KR101046019B1 (ko) * 2003-05-15 2011-07-01 코니카 미놀타 옵토 인코포레이티드 광학계 및 촬상 장치
ATE523854T1 (de) * 2004-01-23 2011-09-15 Intermec Ip Corp Autofokus-strichcode-scanner und dergleichen mit mikrofluidischen linsen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997008897A1 (fr) * 1995-08-23 1997-03-06 Smith & Nephew, Inc. Systeme d'affichage video a distance equipe d'un filtre colore a cristaux liquides
US20060177098A1 (en) * 1997-04-02 2006-08-10 Stam Joseph S System for controlling exterior vehicle lights
WO1999064267A1 (fr) * 1998-06-09 1999-12-16 Gentex Corporation Systeme d'imagerie utile pour commander les phares avant d'un vehicule
WO2004027489A1 (fr) * 2002-09-19 2004-04-01 Koninklijke Philips Electronics N.V. Element optique commutable
US20070019006A1 (en) * 2005-07-12 2007-01-25 Marcu Gabriel G Subtractive display

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