A liquid crystal display device and a control method thereof are provided. The liquid crystal display device includes a liquid crystal display unit, a position capturing unit, a control unit and at least two backlight units. The at least two backlight units have different light emergent directions; the position capturing unit is configured to collect position information of a user, and feed the position information back to the control unit; the control unit is configured to acquire a viewing angle of the user based on the position information, and control the backlight unit having a light emergent direction matching with the viewing angle to emit light, and meanwhile, adjust a brightness of the liquid crystal display unit, so as to make the brightness match with the viewing angle. The liquid crystal display device can ensure no loss of image quality in a liquid crystal display device at different viewing angles.

Based on information about a vehicle, the information can be projected and displayed onto a road surface or the like. An image projection apparatus, which projects an image, includes an acquisition unit that acquires the information about the vehicle, and an image projection unit that projects the image based on the information acquired by the acquisition unit.

According to an aspect, a light source device includes an optical element and a light source configured to emit emission light toward the optical element. The optical element integrally includes a body having a plate-like shape including a first plate surface that faces the light source and is tilted relative to an optical axis of the emission light, and prisms each having a triangular sectional shape and disposed on the first plate surface in a state of being separated from each other. Each of the prisms has a disposition surface disposed on the first plate surface, an entrance surface on which the emission light is incident, and a reflection surface that reflects, toward the first plate surface, the emission light incident through the entrance surface. An incident angle of the emission light relative to the reflection surface is equal to or larger than a critical angle of the reflection surface.

Based on information about a vehicle, the information can be projected and displayed onto a road surface or the like. An image projection apparatus, which projects an image, includes an acquisition unit that acquires the information about the vehicle, and an image projection unit that projects the image based on the information acquired by the acquisition unit.

A display device can include a first light source unit having a plurality of first light sources, a light controller disposed on the first light source unit and having a plurality of partitions overlapping at least a partial area of the active area, a second light source unit disposed on the light controller and having a plurality of second light sources, a light guide plate disposed to be parallel to the second light source unit and configured to guide light provided from the second light source unit, and a display panel disposed on the light guide plate and configured to display an image using light provided from the first light source unit or the second light source unit. The partitions can have a different height in each area and a change rate of a height of the partitions can be different in each area.

The invention provides a light modulation unit including a collimating optical layer and an optical film. The optical film has a light exit surface and a light entrance surface opposite to the light exit surface. The collimation optical layer and the light entrance surface of the optical film are disposed relatively. The light exit surface forms a plurality of microstructures, each of which has a height h in the normal direction of the light exit surface and a virtual aperture in the x-coordinate axis direction parallel to the light exit surface, and the ratio of the height h to the virtual aperture (h/) is 0.2 to 1. The light modulation unit of the present invention has the function of adjusting the brightness of anti-peep viewing angles, and can improve the display brightness of front viewing angles through light pattern control.

According to an aspect, a light source device includes an optical element and a light source configured to emit emission light toward the optical element. The optical element integrally includes a body having a plate-like shape including a first plate surface that faces the light source and is tilted relative to an optical axis of the emission light, and prisms each having a triangular sectional shape and disposed on the first plate surface in a state of being separated from each other. Each of the prisms has a disposition surface disposed on the first plate surface, an entrance surface on which the emission light is incident, and a reflection surface that reflects, toward the first plate surface, the emission light incident through the entrance surface. An incident angle of the emission light relative to the reflection surface is equal to or larger than a critical angle of the reflection surface.

The invention provides a light modulation unit including a collimating optical layer and an optical film. The optical film has a light exit surface and a light entrance surface opposite to the light exit surface. The collimation optical layer and the light entrance surface of the optical film are disposed relatively. The light exit surface forms a plurality of microstructures, each of which has a height h in the normal direction of the light exit surface and a virtual aperture in the x-coordinate axis direction parallel to the light exit surface, and the ratio of the height h to the virtual aperture (h/) is 0.2 to 1. The light modulation unit of the present invention has the function of adjusting the brightness of anti-peep viewing angles, and can improve the display brightness of front viewing angles through light pattern control.

A display device can include a display panel having a first sub area, a second sub area and a third sub area disposed between the first sub area and the second sub area, a first light source unit under the display panel, a light controller disposed on the first light source unit and including a plurality of partitions overlapping the first to third sub areas, a second light source unit disposed on the light controller, and a light guide plate disposed to be parallel to the second light source unit. The partitions have a different height in each area.