Method and device for tracking sweet spots
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United States of America Patent
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Nov 12, 2013
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app pub date -
Feb 24, 2006
filing date -
Feb 25, 2005
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Abstract
The invention relates to a method and device for tracking the sweet spots of a sweets spot unit for a transmissive electronic display. The aim of the invention is to improve the reproduction quality and the uniformity of illumination in displays of this type. The display contains a sweet spot unit consisting of an illumination matrix (1) and reproduction elements, in addition to an image matrix (4). Once the position of at least one observer's eye (6) has been determined by a control unit using inverse ray tracing, address data for activating illumination elements (LE) of the illumination matrix (1) is provided from the position data in order to prepare the defined sweet spots (5) for said observer's eye (6). To improve the reproduction quality, an additional optical component is used in ray path for the inverse ray tracing process. In addition to the viewing angle (α) of the observer, the control unit detects and takes into consideration a defined angle (θ) of a scattering or diffractive element in a predetermined angular range. The permits additional address data to be activated for the illumination elements (LE) and the defined sweet spot (5) can be illuminated in a uniform manner.
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