Display apparatus and variable lens array

Abstract

A display apparatus includes: a display unit that displays a two-dimensional image; and a variable lens array disposed to face the display unit, wherein the variable lens array includes a variable phase difference layer that receives incident linearly polarized light polarized in a first direction and allows the linearly polarized light polarized in the same direction to exit or allows linearly polarized light polarized in a second direction switched from the first direction and different therefrom to exit, and an optically anisotropic layer that receives the light having exited out of the variable phase difference layer and works as a lens array for one of the light polarized in the first direction and the light polarized in the second direction whereas working as a transparent layer for the other light.

What is claimed is: 
     
         1 . A display apparatus comprising:
 a display unit that displays a two-dimensional image; and   a variable lens array disposed to face the display unit, the variable lens array including:
 a variable phase difference layer including a first liquid crystal layer; and 
 an optically anisotropic layer including a second liquid crystal layer, 
   wherein,   when the variable phase difference layer receives incident linearly polarized light polarized in a first direction,   the variable phase difference layer allows the linearly polarized light polarized in the same direction to exit, or   the variable phase difference layer allows linearly polarized light polarized in a second direction switched from the first direction and different therefrom to exit by controlling an orientation of the first liquid crystal layer by applying a voltage to the first liquid crystal layer;   the optically anisotropic layer that receives the light having exited out of the variable phase difference layer and works as a lens array for one of the light polarized in the first direction and the light polarized in the second direction, and   a refractive index of the second liquid crystal layer that works as the lens array for the one of the light is different from a refractive index of the second liquid crystal layer for the other one of the light.   
     
     
         2 . The display apparatus according to  claim 1 ,
 wherein the second liquid crystal layer contains liquid crystalline compound molecules,   the liquid crystalline compound molecules are fixed in an orientation state in which the orientation direction thereof periodically changes in the optically anisotropic layer.   
     
     
         3 . The display apparatus according to  claim 2 ,
 wherein the variable lens array further including an orientation film, and   the second liquid crystal layer is formed to be in contact with the orientation film.   
     
     
         4 . The display apparatus according to  claim 3 ,
 the orientation film undergoes an orientation process in which the orientation film is processed to be capable of periodically changing the orientation direction, and   the second liquid crystal layer is formed by applying a solution containing liquid crystalline compound molecules each having a reactive group on the orientation film and then causing the reactive group to react so that the liquid crystalline compound molecules are fixed.   
     
     
         5 . The display apparatus according to  claim 3 ,
 the orientation film undergoes an orientation process in which the orientation film is processed to be capable of setting the orientation direction to be a fixed direction, and   the second liquid crystal layer is formed by applying a solution containing liquid crystalline compound molecules each having a photo-reactive group on the orientation film, then causing the reactive group of the liquid crystalline compound molecules in predetermined areas set apart at certain intervals to react so that the liquid crystalline compound molecules in the predetermined areas are fixed, and increasing the temperature of the entire structure to cause the reactive group of the liquid crystalline compound molecules in portions other than the predetermined areas to react so that the liquid crystalline compound molecules in the portions are fixed.   
     
     
         6 . The display apparatus according to  claim 1 ,
 wherein a voltage between a pair of transparent common electrodes is applied to the first liquid crystal layer.   
     
     
         7 . The display apparatus according to  claim 1 ,
 wherein the variable lens array further includes a first substrate and a second substrate, and   the variable phase difference layer and the optically anisotropic layer are formed in succession between the first substrate and the second substrate.   
     
     
         8 . A variable lens array comprising:
 a variable phase difference layer including a first liquid crystal layer; and   an optically anisotropic layer including a second liquid crystal layer,   wherein,   when the variable phase difference layer receives incident linearly polarized light polarized in a first direction,   the variable phase difference layer allows the linearly polarized light polarized in the same direction to exit, or   the variable phase different layer allows linearly polarized light polarized in a second direction switched from the first direction and different therefrom to exit by controlling an alignment of variable phase difference layer by applying a voltage to the first liquid crystal layer;   the optically anisotropic layer that receives the light having exited out of the variable phase difference layer and works as a lens array for one of the light polarized in the first direction and the light polarized in the second direction, and   a refractive index of the second liquid crystal layer that works as the lens array for the one of the light is different from a refractive index of the second liquid crystal layer for the other one of the light.