Stereoscopic display

1. A stereoscopic display comprising:

a display panel configured to display an image in a first arrangement state and a second arrangement state which are switchable with each other, the second arrangement state being defined as a state where an arrangement direction of the display panel is rotated by 90°, in a plane parallel to a display surface of the display panel, from an arrangement direction of the display panel in the first arrangement state; and

a lens array device arranged to face a display surface of the display panel and including a plurality of cylindrical lenses configured to be arranged in parallel along a direction according to the arrangement state of the display panel,

wherein when the display panel is in the first arrangement state, the plurality of cylindrical lenses are arranged in parallel along a horizontal direction so that axes of the cylindrical lenses are inclined from a vertical direction in the plane parallel to the display surface, and when the display panel is in the second arrangement state, the plurality of cylindrical lenses are arranged in parallel along the horizontal direction so that the axes of the cylindrical lenses are directed to a vertical direction in the plane parallel to the display surface, and

the display panel has a pixel configuration that a plurality of sub-pixels are two-dimensionally arranged, each of the plurality of sub-pixels corresponding to each of a plurality of colors necessary for color display, and a position of each of sub-pixels which are used, as a combination, to configure a unit pixel for color display are changed between the first arrangement state and the second arrangement state,

wherein the color sub-pixels R,G,B are substantially rectangular in shape and groups of the sub-pixels are sequentially disposed in a brick layer staggered arrangement.

2. The stereoscopic display according to claim 1 , wherein

the lens array device is a variable liquid crystal lens array having a liquid crystal layer which is configured to selectively produce a cylindrical-lens effect as an effect of the plurality of cylindrical lenses, the cylindrical-lens effect being allowed to be produced in either one of two different directions by electrically changing a refractive index distribution in a liquid crystal layer.

3. The stereoscopic display according to claim 1 , wherein

when the display panel is in the first arrangement state, the sub-pixels of the plurality colors are cyclically arranged along a vertical line, and when the display panel is in the second arrangement state, the sub-pixels of the plurality colors are cyclically arranged in a horizontal line, while a sub-pixel of a color on a first horizontal line and a sub-pixel of same color on a second horizontal line which is adjacent to the first horizontal line are arranged with no interval in the horizontal direction and overlap with each other, and

when the display panel is in the second arrangement state, a combination of sub-pixels of different colors arranged in respective different horizontal lines is used as the unit pixel for color display, and when the display panel is in the first arrangement state, a combination of sub-pixels of different colors arranged in respective different vertical lines is used as the unit pixel for color display.

4. The stereoscopic display according to claim 1 , wherein

the sub-pixels in the display panel have a rectangular shape,

a longer side direction of the sub-pixel coincides with the vertical direction when the display panel is in the first arrangement state, and a shorter side direction of the sub-pixel coincides with the vertical direction when the display panel is in the second arrangement state,

a pixel width Wy in the longer side direction satisfies the following relational expression:

Wy=Py (1−1/ N ), and

an angle θ satisfies the following expression:

θ=tan −1 ( Px/ ( Py (1+1/ N ))),

where Px and Py represent pixel pitches in the shorter side direction and the longer side direction of the sub-pixel, respectively,

Wy represents a pixel width of the sub-pixels in the longer side direction,

θ represents an inclination angle of the axes of the cylindrical lenses with respect to the vertical direction of the display panel in the first arrangement state, and

N represents a number in the vertical direction of sub-pixels which configure a three-dimensional pixel as a unit pixel for a stereoscopic image in the second arrangement.

5. A stereoscopic display comprising:

a display panel configured to display an image in either one of two or more arrangement states including a first arrangement state and a second arrangement state which are switchable with each other; and

a lens array device arranged to face a display surface of the display panel,

wherein the lens array device produces a lens effect in a direction, the direction of effect being changed between in the first arrangement state and in the second arrangement state, and

the display panel includes an array of a plurality of sub-pixels, and a combination of sub-pixels used as a unit pixel is changed between the first arrangement state and the second arrangement state, wherein

the sub-pixels in the display panel have a rectangular shape,

a longer side direction of the sub-pixel coincides with the vertical direction when the display panel is in the first arrangement state, and a shorter side direction of the sub-pixel coincides with the vertical direction when the display panel is in the second arrangement state,

a pixel width Wy in the longer side direction satisfies the following relational expression:

Wy=Py (1−1/ N ), and

an angle θ satisfies the following expression:

θ=tan −1 ( Px/ ( Py (1+1/ N ))),

where Px and Py represent pixel pitches in the shorter side direction and the longer side direction of the sub-pixel, respectively,

Wy represents a pixel width of the sub-pixels in the longer side direction,

θ represents an inclination angle of the axes of the cylindrical lenses with respect to the vertical direction of the display panel in the first arrangement state, and

N represents a number in the vertical direction of sub-pixels which configure a three-dimensional pixel as a unit pixel for a stereoscopic image in the second arrangement.

6. The stereoscopic display according to claim 5 , wherein

the second arrangement state is defined as a state where an arrangement direction of the display panel is rotated by 90°, in a plane parallel to a display surface of the display panel, from an arrangement direction of the display panel in the first arrangement state.

7. The stereoscopic display according to claim 6 , wherein

the lens array device includes a first substrate, a second substrate and a liquid crystal layer arranged between the first substrate and the second substrate,

a plurality of first electrode groups extending in a first direction are arranged in parallel on a side facing the second substrate of the first substrate,

a plurality of second electrode groups extending in a second direction are arranged in parallel on a side facing the first substrate of the second substrate, and

voltages applied to the first electrode groups and the second electrode groups are changed between the first arrangement state and the second arrangement state.