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Proceedings Paper

Ultra-compact multichannel freeform optics for 4xWUXGA OLED microdisplays
Author(s): Marina Buljan; Bharathwaj Narasimhan; Pablo Benítez; Juan Carlos Miñano; Jesús López; Dejan Grabovičkić; Milena Nikolić; Eduardo Pérez; Jorge Gorospe; Eduardo Sanchez; Juan Carlos González; Pablo Zamora; Rubén Mohedano
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Paper Abstract

We present an advanced optical design for a high-resolution ultra-compact VR headset for high-end applications based on multichannel freeform optics and 4 OLED WUXGA microdisplays developed under EU project LOMID [1]. Conventional optical systems in VR headsets require large distance between lenses and displays that directly leads to the rather bulky and heavy commercial headsets we have at present. We managed to dramatically decrease the required display size itself and the display to eye distance, making it only 36 mm (to be compared to 60-75 mm in most conventional headsets). This ultra-compact optics allows reducing the headset weight and it occupies about a fourth of volume of a conventional headset with the same FOV. Additionally, our multichannel freeform optics provides an excellent image quality and a large field of view (FOV) leading to highly immersive experience. Unlike conventional microlens arrays, which are also multichannel devices, our design uses freeform optical surfaces to produce, even operating in oblique incidences, the highest optical resolution and Nyquist frequency of the VR pixels where it is needed. The LOMID microdisplays used in our headsets are large-area high-resolution (WUXGA) microdisplays with compact, high bandwidth circuitry, including special measures for high contrast by excellent blacks and low-power consumption. LOMID microdisplay diagonal is 0.98” with 16:10 aspect ratio. With two WUXGA microdisplays per eye, our headset has a total of 4,800x1,920 pixels, i.e. close to 5k. As a result, our multichannel freeform optics provides a VR resolution 24 pixels/deg and a monocular FOV of 92x75 degs (or 100x75 with a binocular superposition of 85%).

Paper Details

Date Published: 21 May 2018
PDF: 8 pages
Proc. SPIE 10676, Digital Optics for Immersive Displays, 1067607 (21 May 2018); doi: 10.1117/12.2307452
Show Author Affiliations
Marina Buljan, Limbak 4PI S.L. (Spain)
Bharathwaj Narasimhan, Limbak 4PI S.L. (Spain)
Univ. Politécnica de Madrid (Spain)
Pablo Benítez, Limbak 4PI S.L. (Spain)
Univ. Politécnica de Madrid (Spain)
Juan Carlos Miñano, Limbak 4PI S.L. (Spain)
Univ. Politécnica de Madrid (Spain)
Jesús López, Limbak 4PI S.L. (Spain)
Dejan Grabovičkić, Limbak 4PI S.L. (Spain)
Milena Nikolić, Limbak 4PI S.L. (Spain)
Eduardo Pérez, Limbak 4PI S.L. (Spain)
Jorge Gorospe, Limbak 4PI S.L. (Spain)
Eduardo Sanchez, Univ. Politécnica de Madrid (Spain)
Juan Carlos González, Univ. Politécnica de Madrid (Spain)
Pablo Zamora, Limbak 4PI S.L. (Spain)
Rubén Mohedano, Limbak 4PI S.L. (Spain)

Published in SPIE Proceedings Vol. 10676:
Digital Optics for Immersive Displays
Bernard C. Kress; Wolfgang Osten; Hagen Stolle, Editor(s)

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