| 摘要 |
<p>Display apparatus (2) for displaying an image by back projection, which display apparatus (2) comprises a projector (4), a screen (6), and a quarterwave retarder (8), the screen (6) being a back projection screen (6) that maintains the polarisation state of incident light (10), the quarterwave retarder (8) being orientated such that its axis at 45° to the axis of polarised light (11) from the projector (4), and the quarterwave retarder (8) being such that it circularly polarises linearly polarised light that it receives, for example from the projector (4).</p> |
