Display system and vehicle

#This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2020-079641, filed Apr. 28, 2020, the entire contents of which are incorporated herein by reference.

#Embodiments described herein relate generally to a display system and a vehicle

#In a recent display device, there is demand for making a viewing angle which realizes a predetermined contrast ratio changeable. For example, in a display device mounted on a vehicle such as a car, there is demand for controlling the viewing angle such that a display image can be viewed from a passenger seat side but cannot be viewed from a driver seat side during driving or the like.

#FIG. 1 is an illustration showing a configuration example of a display device DSP.

#FIG. 2 is an illustration showing a configuration example of a display system SYS employing the display device DSP shown in FIG. 1.

#FIG. 3 is an illustration for explaining the axis angle of each optical element constituting the display device DSP.

#In general, according to one embodiment, there is provided a display system comprising: an external light sensor detecting an external light intensity; a display panel modulating a first polarization component having a first polarization axis; a viewing angle control panel comprising a liquid crystal layer containing liquid crystal molecules twist-aligned, configured such that a drive voltage applied to the liquid crystal layer is controlled based on the external light intensity detected by the external light sensor, and transmitting a second polarization component having a second polarization axis different form the first polarization axis; and a polarization axis rotation element disposed between the viewing angle control panel and the display panel, and rotating the second polarization axis of the second polarization component transmitted through the viewing angle control panel. The drive voltage when the external light intensity is less than a threshold value is greater than the drive voltage when the external light intensity is greater than or equal to the threshold value.

#According to another embodiment, there is provided a display system comprising: a display panel modulating a first polarization component having a first polarization axis; a tracking sensor tracking an eye gaze of a user opposed to the display panel; a viewing angle control panel comprising a liquid crystal layer containing liquid crystal molecules twist-aligned, configured such that a drive voltage applied to the liquid crystal layer is controlled based on the eye gaze detected by the tracking sensor, and transmitting a second polarization component having a second polarization axis different form the first polarization axis; and a polarization axis rotation element disposed between the viewing angle control panel and the display panel, and rotating the second polarization axis of the second polarization component transmitted through the viewing angle control panel. The drive voltage when the eye gaze is detected to be in a predetermined direction is greater than the drive voltage when the eye gaze is detected to be in a direction different from the predetermined direction.

#According to yet another embodiment, there is provided a vehicle comprising: a front window disposed in a front part of the vehicle; a driver seat and a passenger seat; a display device disposed in front of the driver seat and the passenger seat; and an external light sensor detecting an external light intensity. The display device comprises: a display panel; and a viewing angle control panel comprising a liquid crystal layer containing liquid crystal molecules twist-aligned, and configured such that a drive voltage applied to the liquid crystal layer is controlled based on the external light intensity detected by the external light sensor. The drive voltage when the external light intensity is less than a threshold value is greater than the drive voltage when the external light intensity is greater than or equal to the threshold value.