P‐174: Ultra Compact Projection System for Mobile Application

Großmann, Constanze; Vogel, Uwe; Lippmann, Uwe; Riehemann, S.; Notni, Gunther

doi:10.1889/1.3256687

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…The construction volume is smaller than 10 cm 3 directly on the OLED. 8 A maximal illuminance of 5.5 lx (E calculated = 6 lx) and a luminance of 0.061 lm (Φ calculated = 0.065 lm) is measured (first OLED prototype @ 4.400 cd/m 2 ). The image uniformity in the bright modus is 85% (white image) and in the dark modus 89% (black image).…”

Section: One-panel Pico-projection System (Monochrome)mentioning

confidence: 99%

OLED‐based pico‐projection system

Großmann¹,

Riehemann²,

Notni³

et al. 2010

J Soc Info Display

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Two pico-projection systems, a monochrome green and a full-color system, based on high-efficiency OLED microdisplays (VGA; pixel size, 12 mu m) are presented. Both optical systems are described by a numerical aperture of about 0.3, a magnification of 15x, and a working distance of 300-360 mm. The frequency limit of both systems is 42 cycles/mm at an image contrast of about 60%. The monochrome projection system with a volume smaller than 10 cm(3) consists of one green OLED and a projection lens with five elements. The measured luminance in the image plane is about 0.061 lm. The image has a diagonal of 150 mm with a working distance of about 300 mm and has a considerable image contrast of 396: 1. The second system combines three high-brightness OLEDs, red, green, and blue colored, together with a projection lens and an image-combining element, and an X-Cube to achieve full-color projection. The estimated luminance value for the three-panel projection unit with an OLED luminance of 10,000 cd/m(2) for each display will be about Phi(calculated) = 0.147 lm. In this paper, the system concepts, the optical designs, and the realized prototypes of the monochrome and full-color projection system are presented

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Section: One-panel Pico-projection System (Monochrome)mentioning

confidence: 99%

OLED‐based pico‐projection system

Großmann¹,

Riehemann²,

Notni³

et al. 2010

J Soc Info Display

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“…An organic light-emitting diode on silicon (OLEDoS) is used for microdisplay applications such as picoprojectors implemented in cellular phones, electronic viewfinders, and head-mounted displays (HMDs). [1][2][3][4] The OLEDoS can be implemented using single-crystalline silicon as a backplane. Therefore, the OLEDoS can be realized in smaller and lighter form than organic light-emitting diode (OLED) displays using other backplane technologies such as poly and amorphous silicon.…”

Section: Introductionmentioning

confidence: 99%

Organic Light-Emitting Diode-on-Silicon Pixel Circuit Using the Source Follower Structure with Active Load for Microdisplays

Kwak

Lim

Kwon

2011

Jpn. J. Appl. Phys.

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In this paper, we propose a pixel circuit immune to the electrical characteristic variation of organic light-emitting diodes (OLEDs) for organic light-emitting diode-on-silicon (OLEDoS) microdisplays with a 0.4 inch video graphics array (VGA) resolution and a 6-bit gray scale. The proposed pixel circuit is implemented using five p-channel metal oxide semiconductor field-effect transistors (MOSFETs) and one storage capacitor. The proposed pixel circuit has a source follower with a diode-connected transistor as an active load for improving the immunity against the electrical characteristic variation of OLEDs. The deviation in the measured emission current ranges from -0.165 to 0.212 least significant bit (LSB) among 11 samples while the anode voltage of OLED is 0 V. Also, the deviation in the measured emission current ranges from -0.262 to 0.272 LSB in pixel samples, while the anode voltage of OLED varies from 0 to 2.5 V owing to the electrical characteristic variation of OLEDs.

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“…Recently, projectors implemented in cellular phones, viewfinders of digital cameras, and head-mount displays have been developed as part of microdisplays. [1][2][3] The organic light-emitting diode-on-silicon (OLEDoS) displays, which use a complementary metal oxide semiconductor (CMOS) process as backplane technology, have been proposed for realizing microdisplays with organic light-emitting diode (OLED) displays. 1,2) Because devices using the standard CMOS process are much smaller than those using the thinfilm transistor (TFT) process, pixel circuits using the standard CMOS process can be integrated into a small pixel area, usually several tens of mm 2 .…”

Section: Introductionmentioning

confidence: 99%

Pixel Circuit for Organic Light-Emitting Diode-on-Silicon Microdisplays Using the Source Follower Structure

Kim¹,

Kwak²,

Lim³

et al. 2010

Jpn. J. Appl. Phys.

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We study the relaxation properties of the voter model with i.i.d. random bias. We prove under mild conditions that the disorder-averaged relaxation of this biased random voter model is faster than a stretched exponential with exponent d/(d + α), where 0 < α 2 depends on the transition rates of the non-biased voter model. Under an additional assumption, we show that the above upper bound is optimal. The main ingredient of our proof is a result of Donsker and Varadhan. § Postdoctoraal onderzoeker FWO. Bursaal IWT. 0305-4470/99/447653+12$30.00

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P‐174: Ultra Compact Projection System for Mobile Application

Abstract: An ultra compact projection system for mobile application based on OLED microdisplay has been developed. This OLED projection system will be integrated into a wearable optical system like mobile phone or PDA. System design and realized prototype of the projection lens will be presented.

Cited by 5 publications

References 2 publications

OLED‐based pico‐projection system

OLED‐based pico‐projection system

Organic Light-Emitting Diode-on-Silicon Pixel Circuit Using the Source Follower Structure with Active Load for Microdisplays

Pixel Circuit for Organic Light-Emitting Diode-on-Silicon Microdisplays Using the Source Follower Structure

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