Optical device and three-dimensional display device
AssigneeNippon Telegraph and Telephone Corporation
InventorsShiro Suyama, Munekazu Date, Shigeto Kohda, Kinya Kato, Shigenobu Sakai
Life of this patent
Estimating the term…
Abstract
An optical device includes a transparent material layer having a desired curved surface configuration, a layer including a variable refractive index material having a dielectric constant anisotropy, at least two transparent electrodes arranged to sandwich the transparent material layer and the variable refractive index material, and a driving device supplying a voltage including driving frequencies f1 and f2 between the transparent electrodes. The difference Δ∈ in the dielectric constant of the variable refractive index material due to the anisotropy is positive at one of the driving frequencies and negative at the other driving frequency.
Claims12
A three-dimensional display device for forming three dimensional image from two-dimensional image on a display portion, comprising:
- a layer of a transparent material having a desired curved surface configuration;
- layer of a variable refractive index material having a refractive index varying in accordance with a voltage applied thereto;
- at least two transparent electrodes arranged to sandwich said layer of the transparent material and said layer including the variable refractive index material;
- an imaging position shifting portion for shifting an imaging position of said two-dimensional image displayed on said display portion;
- a synchronizing portion for synchronizing an updating period of the two dimensional image displayed on said display portion with a shifting period of the imaging point of said imaging position shifting portion;
- and
- a driving portion for driving said imaging point shifting portion by applying a voltage to said at least two transparent electrodes in accordance with an output from said synchronizing portion.
A driving method of driving a three-dimensional display device including a display portion for displaying two-dimensional images, an imaging point shifting portion disposed between said display portion and an observer, a synchronizing portion for synchronizing an updating period of the two-dimensional images displayed on said display portion with a shifting period of the imaging point of said imaging point shifting portion, and a driving portion for driving said imaging point shifting portion, said a driving method comprising the steps of:
- outputting a plurality of driving signals of an output voltage VN (N≧2) having frequency fN as a primary frequency for a predetermined period of time assigned to each of the driving signals in a predetermined sequence to drive said imaging point shifting portion in said driving portion;
- and
- updating and displaying said two-dimensional images in a predetermined sequence on said display portion in said synchronizing portion.
A driving method of driving a three-dimensional display device including a display portion for displaying two-dimensional images, an imaging point shifting portion disposed between said display portion and an observer, a synchronizing portion for synchronizing an updating period of the two-dimensional image displayed on said display portion with a shifting period of the imaging point of said imaging point shifting portion, and a driving portion for driving said imaging point shifting portion, said a driving method comprising the steps of:
- in said driving portion:
- generating a driving signal of a predetermined output voltage in which a frequency fN (N≧2) is superimposed;
- applying said driving signal to said imaging position shifting portion;
- varying said output voltage in a predetermined sequence in accordance with a synchronization signal of said synchronizing portion;
- and
- in said synchronization portion:
- outputting a synchronization signal in said synchronization portion when updating two-dimensional images to be displayed on said display portion.
Dependencies are inferred from the claim text.