Patent ID: 9618762
Date: 2017-04-11
CPC Classifications: G02B,H04N

Claim:
1. An autostereoscopic display apparatus for displaying a three-dimensional image, comprising: a backlight to emit light from switchable apertures, the light being polarized; a plurality of light modulation panels, each panel comprising pixels that can be set to change the polarization of the light emitted from the switchable apertures; and a polarizer arranged to receive the emitted light having passed through the plurality of light modulation panels and arranged to transmit light within a limited range of polarizations; wherein each light modulation panel is controllable to change the polarization of the emitted light between a first polarization, a second polarization and at least one intermediate polarization such that an intensity of the emitted light after passing through the polarizer, as perceived by a viewer, can be both increased and decreased irrespective of the polarization of the emitted light before passing the plurality of light modulation panels, and wherein switching of the apertures is synchronized with the switching of the pixels on the plurality of light modulation panels, and wherein each light modulating panel provides a first twist value when an applied voltage is at an off voltage, a second twist value when the applied voltage is at a fully on voltage, and a third twist value different from said first and second twist values when the applied voltage is between the off voltage and fully on voltage.