| 摘要 |
A display apparatus has a switchable birefringent lens array. The lens array comprises birefringent material arranged between a planar surface of a first substrate and a relief substrate of a second substrate defining an array of cylindrical lenses. The birefringent material can be switched electrically between a first mode in which the lens array has a lensing effect and a second mode in which the lensing effect is substantially absent. The director of the birefringent material may be arranged to lie in the plane of the substrates (twisted nematic orientation), or the director may be aligned homeotropically at the relief surface. The lens array may be located between a spatial light modulator and the output polariser of the display apparatus. The spatial light modulator may be emissive. Variations in the lens temperature may be compensated for in order to extend its operating range.
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