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Switch from personal view to wide view

IP.com Disclosure Number: IPCOM000012995D
Publication Date: 2003-Jun-12
Document File: 1 page(s) / 8K

Publishing Venue

The IP.com Prior Art Database



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Switch from personal view to wide view

    In (mobile) display systems people sometimes want to view a display personally, i.e. without other people being able to view the content (e.g. a display on a mobile phone in a train). In other occasions people want to view a display from different angles (e.g. when watching in a group).

    The problem is that displays have a fixed viewing angle. The challenge is to make a display with an adjustable viewing angle.

    It is known that a lenticular sheet in front of a display can be used to switch from 2D view to 3D view. The switch is performed by filling a chamber above the lenses with an index-matching liquid. A similar method to switch a display from a wide view to a narrow view is schematically explained in figure 1.

Figure 1. Pumping a liquid into a chamber will weaken or eliminate the lens action, which will widen the viewing angle.

    The liquid may be pumped manually, but is preferably pumped by the electrowetting effect. A better performance may be obtained by using two liquids with approximately equal density and different refractive index. In this way gravity ef fects are eliminated and the electrowetting pumping principle can be applied on larger systems. The two liquids may for instance change place in a circulating. The narrow view angle may also be chosen in case the viewer wants a brighter display, e.g. under daylight conditions.

Personal view

PixelrrayLensachamberEmpty Liquid

Wide view

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