| 摘要 |
<p>PURPOSE:To remove coloring of half tone display by optimizing the arrangement of TN liquid crystal light bulb polarizing plates to red, green and blue light beams. CONSTITUTION:A polarizing plate on the projection side is arranged in common with red, green and blue beams so that the absorbing axis 6 of the polarizing plate is almost parallel with the orientation axis 5 of liquid crystal molecules on a projection substrate. On the other hand, an incident polarizing plate is arranged so that the transmission axes for red, green and blue beams are set up like 1-3 and angular differences obtained by subtracting the twisted angles of the TN liquid crystal in respective TN liquid crystal light bulbs from angles formed by the transmission axes 1-3 and the absorbing axis 6 of the projecting polarizing plate in the twisted direction of the liquid crystal molecules are reduced in the order of red, green and blue. Consequently, the voltage/ transmissivity curves of red, green and blue components are made almost coincide with each other, so that colorless excellent half tone display can be obtained.</p> |
