A display with a privacy mask for selectively restricting wide-angle viewing

A display with a privacy mask for selectively restricting wide-angle viewing

A display comprises a first plurality of pixels 26(a) at least partially covered by a mask 22 and a second plurality of pixels 26(b) at least partially uncovered by the mask 22. The mask 22 blocks light emitted at wide viewing angles from the second plurality of pixels 26(b) and may also block light...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: MICHAEL JOHN HANNEY, RICHARD JOHN LEWIS
Format: Patent
Sprache:eng
Schlagworte:
DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING
FREQUENCY-CHANGING
NON-LINEAR OPTICS
OPTICAL ANALOGUE/DIGITAL CONVERTERS
OPTICAL LOGIC ELEMENTS
OPTICS
PHYSICS
TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:A display comprises a first plurality of pixels 26(a) at least partially covered by a mask 22 and a second plurality of pixels 26(b) at least partially uncovered by the mask 22. The mask 22 blocks light emitted at wide viewing angles from the second plurality of pixels 26(b) and may also block light emitted at narrow viewing angles from the first plurality of pixels 26(a). The mask 22 may comprise alternating opaque and transparent stripes, or may be presented in a chequerboard arrangement. In a privacy mode, data is written only to the second plurality of pixels 26(b) and consequently the light emitted is viewable only at narrow viewing angles. Optionally, the privacy mode also comprises wilting a spoiler image to the first plurality of pixels 26(a), viewable only from a wide viewing angle. The privacy filtering effect may be used in ATM displays, where sensitive information is to be masked from 'over-the-shoulder' onlookers.