| 摘要 |
<p>A projection television (10) having a projection screen (22) formed by a three-dimensional hologram (26) disposed on a film substrate (24). A blue projection tube (18) is placed centrally in the array of projection tubes, with the red (14) and green (16) projection tubes on either side. The blue tube (18) has an optical path (32) substantially orthogonal to the screen (22) and the red (14) and green (16) projection tubes have optical paths (34, 36) converging toward orthogonal at angles of incidence α. The hologram (26) represents a three-dimensional interference or diffraction array having a configuration effective for reducing color shift in the displayed images. The screen has a color shift less than or equal to approximately 5 over angles of incidence up to 30°. Results of centering the blue projection tube (18) rather than the green (16), in combination with the holographic screen (22), include balanced drive current to the blue (18) and green (16) projection tubes, good brightness and acceptable color temperature. </p> |
