Bi‐directional OLED microdisplay for interactive see‐through HMDs: Study toward integration of eye‐tracking and informational facilities

Vogel, Uwe; Kreye, Daniel; Richter, B.; Bunk, Gerd; Reckziegel, Sven; Herold, Rigo; Scholles, M.; Törker, Michael; Grillberger, Christiane; Amelung, J.; Graupner, Sven-Thomas; Pannasch, Sebastian; Heubner, Michael; Velichkovsky, Boris M.

doi:10.1002/j.2637-496x.2009.tb00065.x

Cited by 4 publications

(7 citation statements)

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“…Generally, the pixel non-uniformity will be aroused by the manufacturing variations in either the CMOS process or the OLED process and the degradation or the operating time of differential pixels. The current source driver becomes the prevalent efficient driving scheme for pixel uniformity and the OLED lifetime due to its robust constant current output [15,21,33,34]. A number of voltage source drivers have been proposed to provide compensations for the threshold voltage variations of the driving transistor [18,26,35].…”

Section: B Pixel Drivermentioning

confidence: 99%

“…The OLED pixel is fabricated by the OLED process and not integrated in the backplane. The 1-bit memory cell stores the pixel on-off state, which makes the pixel driver different from the analog driving circuit that stores the voltage or current amplitude in most TFT drivers [33][34][35] and some microdisplay drivers [15,21]. The traditional 1T dynamic random-access memory (DRAM) with one capacitor is an open option for the OLED driver, but the capacitor is an area-consuming component as more than 50 fF capacitance is required to sustain the pixel current between two scan points in the optimal scan.…”

Section: B Pixel Drivermentioning

confidence: 99%

“…Fraunhofer IPMS achieved the European project HYPOLED on digital video graphics array (VGA) full-color OLED microdisplay [20] and presented an interesting bidirectional OLED microdisplay, which is able to display and sample images on one silicon chip [21]. The Chinese company, OLEID, released their 800 × 600 pixel resolution OLED microdisplay to the public in 2010 [22].…”

Section: Introductionmentioning

confidence: 99%

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Optimal scan strategy for mega-pixel and kilo-gray-level OLED-on-silicon microdisplay

et al. 2012

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The digital pixel driving scheme makes the organic light-emitting diode (OLED) microdisplays more immune to the pixel luminance variations and simplifies the circuit architecture and design flow compared to the analog pixel driving scheme. Additionally, it is easily applied in full digital systems. However, the data bottleneck becomes a notable problem as the number of pixels and gray levels grow dramatically. This paper will discuss the digital driving ability to achieve kilogray-levels for megapixel displays. The optimal scan strategy is proposed for creating ultra high gray levels and increasing light efficiency and contrast ratio. Two correction schemes are discussed to improve the gray level linearity. A 1280×1024×3 OLED-on-silicon microdisplay, with 4096 gray levels, is designed based on the optimal scan strategy. The circuit driver is integrated in the silicon backplane chip in the 0.35 μm 3.3 V-6 V dual voltage one polysilicon layer, four metal layers (1P4M) complementary metal-oxide semiconductor (CMOS) process with custom top metal. The design aspects of the optimal scan controller are also discussed. The test results show the gray level linearity of the correction schemes for the optimal scan strategy is acceptable by the human eye.

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Section: B Pixel Drivermentioning

confidence: 99%

Section: B Pixel Drivermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimal scan strategy for mega-pixel and kilo-gray-level OLED-on-silicon microdisplay

et al. 2012

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“…In [1] the use of OLEDs in bi-directional microdisplays was introduced. A potential issue of such a bi-directional microdisplay is optical crosstalk between display and camera.…”

Section: Figure 1 Block Diagram Of Istar Microdisplay Chipmentioning

confidence: 99%

12.4: Interactive See‐Through Augmented‐Reality Smart Display System

Vogel

Herold

Richter

et al. 2011

Symp Digest of Tech Papers

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iSTAR" is dedicated towards components, system and application development of "Interactive See-Through AugmentedReality Displays", comprising a VGA OLED microdisplay with embedded image sensor aimed on gaze-control, see-through head-mounted optics, and mobile applications in industry, consumer and security areas. This paper reports on bi-directional microdisplay chip and optics, and intermediate performance results.

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“…1 Microdiplays are used in head mounted displays (HMD) used for virtual reality (VR) or augmented reality (AR). 2 A main feature of microdisplays is that they are typically fabricated as flat image-generating surfaces. Therefore, they generate a rectilinear flat image that must be transformed into a curved image wave-front representation for projection into the eye.…”

Section: Introductionmentioning

confidence: 99%

Curved OLED microdisplays

et al. 2019

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Technical background for CMOS substrate thinning of CEA‐LETI (historically developed for through silicon via technology as well as for more recent activity to provide curved image sensors, for IR as well as for visible spectra) has been applied to realize curved OLED‐based microdisplays. It will be shown that test OLEDs made onto silicon wafers as well as 873 × 500 WVGA, 0.38″ diagonal, and an innovative 1920 × 1200 WUXGA, 1″diagonal, CMOS‐based microdisplays can be curved at R = 45 mm radius of curvature (1D) with no negative impact onto the circuit electrical characteristics. This feature can allow significant innovation on the system and application because it can help to redesign simpler and lighter optical engine systems, in the same manner as for curved image sensors. These results can be obtained owing to the integration of a new protective hard coat layer that has been used in conjunction with a robust thin‐film encapsulation to protect OLEDs from mechanical ingress (from process steps and handling) and oxidizing gas of the atmosphere, respectively. Results have been produced within the framework of the EU‐funded, H2020 project, called Large cost‐effective OLED MIcroDisplays (LOMID and their applications).

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Bi‐directional OLED microdisplay for interactive see‐through HMDs: Study toward integration of eye‐tracking and informational facilities

Cited by 4 publications

References 0 publications

Optimal scan strategy for mega-pixel and kilo-gray-level OLED-on-silicon microdisplay

Optimal scan strategy for mega-pixel and kilo-gray-level OLED-on-silicon microdisplay

12.4: Interactive See‐Through Augmented‐Reality Smart Display System

Curved OLED microdisplays

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