Optical sensors based on monolithic integrated organic light-emitting diodes (OLEDs)

Abstract

Organic light-emitting diodes (OLEDs) permit the monolithic integration of microelectronic circuits and light-emitting devices on the same silicon chip. By the use of integrated photodetectors, low-cost CMOS processes and simple packaging; economically produced optoelectronic integrated circuits (OEICs) with combined sensors and actuating elements can be realized. The OLEDs are deposited directly on the top metal layer. The metal layer serves as electrode and defines the bright area. Furthermore, the area below the electrodes can be used for integrated circuits. Due to efficient emitter with low operating voltage it is possible to renounce high-voltage devices depending on selected CMOS process. Thus manufg. cost can be further reduced. Different CMOS metalizations were examd. and their effects on org. light-emitting diodes were analyzed. Red (628nm) and orange (597nm) emitting p-i-n OLEDs with a radiance of 5W/m2sr at 2.8V and 3.0V and a half angle of +-45 Deg were realized on metal layer with low roughness. Near infra-red emitters are in development. We will present an optical microsystem. The functionality of combined sensors and actuating elements as well as advantages and difficulties of the monolithic integration of OLEDs and CMOS will be discussed. The chip was manufd. in a com. 1micro m CMOS technol. The fabricated microsystem combines three different types of sensors: a reflective sensor, a color sensor and a particle flow sensor

Optical system designs based on bi-directional sensor devices

“…First applications which are based on a similar working bi-directional OLED sensor are a flow-, color-, and reflex sensor which presented in Reckziegel et.al. 8 A further metrology application of a distance and inclination sensor is mentioned in Grossmann et al 11 Another application based on a BiMiD which works in different wavelength ranges for the OLED imaging and photo diode detection is a HMD presented by in Richter et al 9 and Herold. 12 This system can be used in the automotive, engineering and multimedia sector.…”

“…Such a bi-directional OLED microdisplay (BiMiD) is realized using OLEDon-CMOS-technology by Fraunhofer IPMS. [8][9][10] The image generating element is placed in the same plane as the detector matrix. The bi-directional display used in these system designs consists of an AM-OLED microdisplay with an integrated photo diode matrix.…”

3D metrology system based on a bi-directional OLED microdisplay

“…First applications which are based on a similar working BiMiD are a flow-, color-, and reflex sensor which are presented in Reckziegel et.al. 8 A further metrology application of a distance and inclination sensor is mentioned in Grossmann et al 11 Another application based on a BiMiD which works in different wavelength ranges for the OLED imaging and photo diode detection is a HMD which is mentioned in Richter et al 9 In this contribution we present a system simulation of a highly integrated compact surface metrology sensor based on bi-directional OLED microdisplay. The 3-D metrology system is based on fringe projection onto the surface of the measurement object.…”

“…Such a bi-directional OLED microdisplay (BiMiD) was realized using OLEDon-CMOS-technology by Fraunhofer IPMS. [8][9][10] The light source/image device is placed in the same plane as the detector matrix. The bi-directional display used in this system design consists of an AM-OLED microdisplay with an integrated photo diode matrix.…”

14.3: A Novel Concept of a Vein Viewer Based on a Bidirectional OLED Microdisplay

“…OLED microdisplays are actually state of the art and are used in a wide range of applications, e.g. multimedia, medical and metrology applications [1][2][3]7].…”