| 摘要 |
<p>An optical modulation device has an electro-optical cell15, first and second electrodes 3a,3b disposed on a first substrate 1, in electrical contact with a resistive layer 2. A third electrode 3c is disposed on a second substrate 5, and an electro-optic material such as liquid crystal 4 is disposed between the first and second substrates. Applying different voltages (VO, V1) to the first and second electrodes 3a,3b, produces a voltage gradient along the resistive layer 2. Applying an intermediate voltage Vsig to the third electrode 3c, defines a first region 6a in the cell wherein the voltage applied across material 4 is lower than a switching threshold voltage and a second region 6b in the cell wherein the voltage applied across material 4 is greater than the switching threshold voltage. The position and width of the first region 6a are controllable independently from one another and are continuously variable, since they are defined by the voltages applied to the first, second and third electrodes. This arrangement provides an adjustable parallax barrier suitable for use in an autostereoscopic display including an eye-tracker and enables the parallax barrier to be adjusted in response to detected movement of a user.</p> |
