There is disclosed herein a waveguide comprising an optical slab and an optical wedge. The optical slab has a first refractive index, n.sub.1>1. The optical slab comprises: a pair of opposing surfaces and an input port. The pair of opposing surfaces are arranged in a parallel configuration. The input port is arranged to receive light into the optical slab at an angle such that the light is guided between the first and second opposing surfaces by a series of internal reflections. The optical wedge has a second refractive index, n.sub.2, wherein 1<n.sub.2<n.sub.1. The optical wedge comprises a pair of opposing surfaces arranged in a wedge configuration. A first surface of the optical wedge abuts the second surface of the optical slab to form an interface that allows partial transmission of light guided by the optical slab into the optical wedge at a plurality of points along the interface such that the light is divided a plurality of times. The angle of the wedge allows light received at the interface to escape through the second surface of the optical wedge such that the exit pupil of the waveguide is expanded by the plurality of divisions of the light.

A vehicle display device includes a display that emits a display image to be projected onto a windshield provided to a vehicle, as display light, at least one reflecting mirror that is disposed on an optical path of the display light from the display to the windshield and reflects the display light, an optical sensor that detects external light (SL) incident from an opening through which an outside and an internal space are communicated with each other, a temperature sensor that detects a temperature of the display, a dimming member that is disposed on the optical path of the display light, and a controller that causes the dimming member to be switched between a state with a first transmissivity and a state with a second transmissivity smaller than the first transmissivity.

A virtual or augmented reality display system that controls power inputs to the display system as a function of image data. Image data itself is made of a plurality of image data frames, each with constituent color components of, and depth planes for displaying on, rendered content. Light sources or spatial light modulators to relay illumination from the light sources may receive signals from a display controlled to adjust a power setting to the light source or spatial light modulator based on control information embedded in an image data frame.

A head-up display system includes a first projection module, a second projection module, and a first reflective optical element. The first projection module projects a first image. The second projection module projects a second image. The first reflective optical element reflects at least a part of the first image and at least a part of the second image. The first projection module includes a first display panel that displays the first image and projects the first image toward the first reflective optical element. The second projection module includes a second display panel that displays the second image, and an optical system that directs the second image toward the first reflective optical element.

A circuit device is used in a display device. The display device includes a display panel and a backlight including a plurality of light sources. The circuit device includes a distortion correction circuit, a failure information acquisition circuit, a position information acquisition circuit, and a host interface circuit. The distortion correction circuit executes distortion correction on input image data to output output image data after the distortion correction. The failure information acquisition circuit acquires failure information of the light sources. The position information acquisition circuit converts panel-side light source position information, which is position information of a faulty light source indicated by the failure information on the display panel, into input-side light source position information, which is position information of the faulty light source on the input image data. The host interface circuit outputs the input-side light source position information to a host.

A head up display system presents a virtual image to a human driver of a motor vehicle. A picture generation unit includes a printed circuit board having at least one light emitting device emitting light from a surface of the printed circuit board. The surface has an optically reflective coating. A liquid crystal display receives the emitted light and reflects a portion of the received emitted light back to the printed circuit board. The optically reflective coating of the printed circuit board reflects the light reflected by the liquid crystal display back to the liquid crystal display. At least one mirror reflects light passed by the liquid crystal display toward a windshield of the motor vehicle such that the light is reflected by the windshield and is visible to the human driver as the virtual image.

There are provided a reflection film, a windshield glass, and a head-up display system capable of suppressing formation of double images of a display image. The reflection film has a linearly polarized light reflection layer in which optically anisotropic layers and isotropic layers are laminated and a polarization converting layer, and the polarization converting layer satisfies any of conditions below. (A) The polarization converting layer is a retardation layer in which the front retardation is 30 nm to 200 nm and the angle between a slow axis direction and a direction of the transmission axis of the linearly polarized light reflection layer is 35° or less. (B) The polarization converting layer is a layer in which a helical alignment structure of a liquid crystal compound is fixed, and the number of pitches x in the helical alignment structure and the film thickness y (unit .Math.m) of the polarization converting layer satisfy all relational expressions below.

$0.1\le \text{x}\le \text{1}\text{.0}$

$0.5\le \text{y}\le \text{3}\text{.0}$

$3000\le (1560\times \text{y)/x}\le \text{50000}$

A head up display including an image-light source, at least one reflector and a light modulation device is provided. The image-light source is configured to provide an image light. The at least one reflector is configured to transmit the image light to leave the head up display. On the transmission path of the image light, the light modulation device is disposed in the head up display. An ambient light enters the image-light source after passing through the light modulation device, and a light energy of the ambient light entering the image-light source is less than or equal to 25% of a light energy of the ambient light entering the head up display.

An HMD apparatus includes an image source, a light guiding element, a first modulating element, and a second modulating element. The image source provides an image beam. The light guiding element is arranged on a transmission path of the image beam to transmit the image beam. The light guiding element has a first surface and a second surface opposite to each other. The image beam undergoes total internal reflection at the first surface and is emitted from the second surface. The first modulating element is arranged on one side of the first surface of the light guiding element and configured to adjust a transmittance of an ambient beam. The light guiding element is arranged between the first and second modulating elements, and the second modulating element is configured to adjust a focus position of the image beam. The HMD apparatus may improve wearing comfort and achieve good display effects.

A vehicle display control device includes a memory and a processor coupled to the memory. The vehicle display control device is configured such that the processor controls a vehicle display device for displaying an image on a display region so as to be superimposed on a portion of a view ahead of a vehicle. The processor is configured so as to detect a preceding vehicle traveling at a vehicle front side of a host vehicle, and in cases in which the preceding vehicle has been detected, causes an image that includes a plurality of inter-vehicle marker objects from the host vehicle side toward the preceding vehicle side to be displayed in the display region, and causes sequential emphasis display of the plurality of inter-vehicle marker objects in sequence from the host vehicle side toward the preceding vehicle side.