Optimum Parameters and Viewing Areas of Stereoscopic Full-Color LED Display Using Parallax Barrier

Hirotsugu YAMAMOTO  Syuji MUGURUMA  Takeshi SATO  Kasai ONO  Yoshio HAYASAKI  Yoshifumi NAGAI  Yoshinori SHIMIZU  Nobuo NISHIDA  

IEICE TRANSACTIONS on Electronics   Vol.E83-C   No.10   pp.1632-1639
Publication Date: 2000/10/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Electronic Displays)
stereoscopic display,  light emitting diode,  parallax barrier,  light emitting display,  display system,  

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By using full-color light emitting diode (LED) panel, we have been studying a stereoscopic full-color large television in broad daylight. In order to implement stereoscopic large display for the general public, optimum parameters of display elements and parallax barrier and viewing areas of stereoscopic display using parallax barrier are discussed. Although stereoscopic display with parallax barrier permits the viewer to view stereoscopic images without any special glasses, its viewing area is restricted by crosstalk and disappearing of pixels. Enlarged viewing areas, which are derived from the small ratio of light emitting region to pixel and a proper aperture ratio of parallax barrier, are analyzed. A model of a viewer standing toward the display is proposed because the viewer apart from the horizontal center of the display turns to the center point of LED display and this turning causes a deviation of viewer's eye position. Then, the allowable number of viewing locations is derived on "no crosstalk" and "no disappearance" conditions. The optimum aperture ratio of parallax barrier and the width of light emitting region is obtained through the optimization. The viewing area obtained from the analysis is confirmed by experiments using full-color LED panel. Relations between viewing area and the moire fringes is also discussed. The depth of the viewing area agrees the viewing distance where no moire fringe appears. Furthermore, possibility of display for the crowds is discussed.