Patent ID: 9190019
Filing Date: 2015-11-17
Classification: G06F,G09G,H04N

Abstract:
1. An image display apparatus comprising: an image display panel; a backlight device located on a back surface side of the image display panel; a first optical element located between the image display panel and the backlight device and including a first deflection element having a plurality of first optical parts and a second deflection element, each of the plurality of first optical parts having a predetermined inclination and being configured to deflect light incident thereon, the second deflection element being configured to change a deflection direction of light incident on the first optical element by changing a refractive index of the second deflection element in accordance with a voltage applied thereto; a second optical element located between the image display panel and the first optical element, the second optical element having a plurality of second optical parts, each of the plurality of second optical parts having a predetermined inclination and being configured to deflect light incident thereon; a position detection section configured to detect a position of a user; and a control section configured to control the voltage applied to the second deflection element, on the basis of information about the position of the user detected by the position detection section, wherein: in a case where a right-left direction when the user faces a display surface of the image display panel is defined as an X direction and a direction perpendicular to the display surface of the image display panel is defined as a Z direction, a thickness in the Z direction of each of the plurality of second optical parts continuously decreases toward a center of the second optical element along the X direction, a thickness in the Z direction of each of the plurality of first optical parts continuously decreases toward a center of the first optical element along the X direction, the plurality of second optical parts is a plurality of first prisms each having an inclined first surface facing the backlight device side, a second surface facing the image display panel side and a third surface, the inclined first surface, the second surface and the third surface forming a triangle in a cross section of an X-Z plane, an width of the inclined first surface along the X direction being greater than the second and third surfaces, a thickness defined by the inclined first surface and the second surface of each of the plurality of first prisms in the Z direction decreasing toward a center of the image display panel in the X direction, and the plurality of first optical parts is a plurality of second prisms each having a inclined first surface facing the image display panel side, a second surface facing the backlight device side and a third surface, the inclined first surface, the second surface and the third surface forming a triangle in a cross section of an X-Z plane, an width of the inclined first surface along the X direction being greater than the second and third surfaces, a thickness defined by the inclined first surface and the second surface of each of the plurality of second prisms in the Z direction decreasing toward the center of the image display panel in the X direction.