A projection display device includes a light source module, a switch unit, and micro-scanning mirrors. The light source module provides a light beam. The switch unit receives the light beam and switches a transmission direction of the light beam to the corresponding one of the micro-scanning mirrors during each of periods. The micro-scanning mirrors cause the light beam to scan over projection surfaces to form images. The projection display device can project the images on the projection surfaces without image brightness loss.

A dial plate is provided with a mark layer having translucency, the mark layer including numbers of linear grooves formed on a surface of the mark layer, and a reflective layer that is arranged on a back face side of the mark layer, and reflects light incident from the mark layer side. The reflective layer includes a light transmission area that allows the light emitted from a light source arranged on the back face side to transmit therethrough to a front face side, and displays a display design by the light transmitting through the light transmission area when the light source is turned on. In the reflective layer, at least the light transmission area is composed of pearl ink.

A head-up display device for a vehicle includes a housing including a guide plate forming first and second surfaces thereof, the housing mounted on a dashboard of a vehicle, a display disposed in the housing for generating an image, a mirror disposed opposite from the display for reflecting the image provided by the display, a combiner device including a combiner for providing the image reflected from the mirror to a driver, and for moving vertically in opposed first and second directions relative to the housing, a shutter device including a shutter disposed on an upper portion of the housing for opening and closing the combiner in a sliding manner, and an operation device disposed in the housing for engaging a sliding movement of the shutter with a movement of the combiner device.

An interior rearview mirror assembly for a vehicle includes a minor head pivotable about a minor support, which is configured to attach at an interior portion of the vehicle. The mirror head includes a mirror reflective element having a transflective mirror reflector that at least partially reflects light incident thereon and at least partially transmits incident light therethrough. A video display device is disposed behind the minor reflective element and includes a display screen backlit by a backlighting device, with the backlighting device including a plurality of micro-LEDs. With the minor support attached at the interior portion of the vehicle, the video display device is operable to display video images captured by a camera of the vehicle, whereby light emitted by the video display device passes through the mirror reflective element for viewing displayed video images.

A display device includes an image generation device configured to allow a viewer to recognize the image, a control device configured to control the image generation device, a light projector configured to output the image as light, an optical mechanism capable of adjusting a distance from a predetermined position to a position at which the light is formed as a virtual image, a concave mirror configured to reflect light passing through the optical mechanism toward a reflector, a first actuator configured to adjust the distance in the optical mechanism, and a second actuator configured to adjust a reflection angle of the concave mirror. The control device estimates a temperature of the light projector, and in a case in which the estimated temperature is equal to or higher than a predetermined upper limit temperature, the control device causes the first actuator to reduce the distance.

A head-up display system and display method, a vehicle, and a computer product. The head-up display system includes: a display device configured to output first linearly polarized light for displaying a first image in a first time intervals and output second linearly polarized lit ht for displaying, a second image in a second time intervals; and a polarization beam splitting element in an optical path of light exiting from the display device, being configured to deflect a propagation direction of the first linearly polarized light by a first angle and deflect a propagation direction of the second linearly polarized light by a second angle, and the first angle and the second angle are different from each other.

A head-up display apparatus adapted to project an image light beam onto a target element is provided. The head-up display apparatus includes a display unit, a diffusion device, and an optical system. The display unit is adapted to provide the image light beam comprising a first light beam and a second light beam. The diffusion device includes a first diffusion region and a second diffusion region, and optical structures of the first and the second diffusion regions are different. The first diffusion region and the optical system are located on a transmission path of the first light beam and guide the first light beam to the target element to form a first image. The second diffusion region and the optical system are located on a transmission path of the second light beam and guide the second light beam to the target element to form a second image.

A light guide unit has a cold mirror unit to guide display light toward a projection window. In an XYZ color system, a wavelength region between a wavelength at which a value of a color matching function Z is maximum and a wavelength at which a value of the color matching function Y is maximum is a first wavelength region, and a wavelength region between a wavelength at which a value of a color matching function Y is maximum and a wavelength at which a value of a color matching function X is maximum is a second wavelength region. A minimum reflectance of the cold mirror unit to the display light takes a minimum value among reflectances of the respective wavelengths in a corresponding wavelength region. The minimum reflectance in the second wavelength region is larger than the minimum reflectance in the first wavelength region.

The information display apparatus has a housing with an opening and a transparent cover formed on the opening, the housing includes image-light generating means configured to generate image light that displays the image information and an optical system configured to allow a driver of the vehicle to recognize image information based on the image light from the image-light generating means as a virtual image in front of the windshield. When S-polarized light on the windshield is assumed to be a first polarized wave while polarized light that orthogonally crosses the S-polarized light in a polarizing direction is assumed to be a second polarized wave, the image-light generating means is configured to generate the image light made of the first polarized wave, and a transmittance/reflectance control means blocks a part of the first polarized wave and the second polarized wave of incident external light entering the housing from the opening.

A circuit device 100 includes an error detection circuit 110 and a processing circuit 120. The error detection circuit 110 obtains a glare index value, which is an index value indicating glare of a head-up display, based on image data IMD for head-up display. The error detection circuit 110 determines whether or not a glare index value has exceeded a first threshold value, and when the glare index value exceeds the first threshold value, detects occurrence of a first glare error. When occurrence of a first glare error is detected, the processing circuit 120 performs processing corresponding to the first glare error.