An apparatus having a computing device and a user interface—such as a user interface having a display that can provide a graphical user interface (GUI). The apparatus also includes a camera, and a processor in the computing device. The camera can be connected to the computing device and/or the user interface, and the camera can be configured to capture pupil location and/or eye movement of a user. The processor can be configured to: identify a visual focal point of the user relative to the user interface based on the captured pupil location, and/or identify a type of eye movement of the user (such as a saccade) based on the captured eye movement. The processor can also be configured to control parameters of the user interface based at least partially on the identified visual focal point and/or the identified type of eye movement.

A head-up display includes a display device and a projection optical system; the projection optical system includes first and second optical elements arranged in order of an optical path from the image; and when optical paths corresponding to an upper end and a lower end of the virtual image are defined as an upper ray and a lower ray, respectively, and a diverging effect and a converging effect are defined as being negative and positive, respectively, the first and the second optical elements satisfy conditional expressions P_u1−P_l1<0 and P_u2−P_l2>0 (where P_u1 denotes a local power of the first optical element acting on the upper ray, P_l1 denotes a local power of the first optical element acting on the lower ray, P_u2 denotes a local power of the second optical element acting on the upper ray, P_l2 denotes a local power of the second optical element acting on the lower ray).

A head-up display includes: a display medium; a display that displays an image; and a projection optical system that forms a virtual image by guiding the image displayed by the display to the display medium. The projection optical system includes a first mirror disposed above the display and reflecting display light of the image. 3<α−(θ+φ)/2<11.7 is satisfied, where θ denotes an angle between a line segment connecting centers of the first mirror and the display and a normal line at the center of the first mirror, α denotes an angle between the line segment connecting the centers of the first mirror and the display and a normal line at the center of the display, and φ denotes an inclination angle at an edge of the first mirror closer to the display relative to the center of the first mirror.

A display device includes a light guide body and displays an image of light emitted from the light guide body. The light guide body is of a curved shape, and includes a light guide plate and an optical element that diffracts and emits light propagating inside the light guide plate. The optical element is provided in the light guide body so that the angle of the optical element relative to a propagation direction in which the light propagates inside the light guide plate is constant irrespective of where in the optical element.

Display systems, such as near eye display systems or wearable heads up displays, may include a laser projection system having an optical engine and an optical scanner. Light output by the optical engine may be directed into the optical scanner as two angularly separated laser light beams. The angularly separated laser light beams typically have different angles of incidence on a second scan mirror of the optical scanner. Respectively different levels of magnification are applied to the beam diameter of each of the angularly separated laser light beams in a first dimension, such that the angularly separated laser light beams have respectively different beam diameters upon incidence at the second scan mirror. In some embodiments, the different beam diameters of the angularly separated laser light beams result in regions of incidence of each of the angularly separated laser light beams on the second scan mirror being equal or substantially similar.

A waveguide head-up display (HUD) includes a waveguide that includes a lower surface and an upper surface and is configured to receive an input and project, based on the input, at least one image from the upper surface and into an eyebox, and a prism arranged at least one of on and above the waveguide. The prism includes a lower surface facing the waveguide and configured to receive the at least one image and an upper surface opposite the lower surface configured to project the at least one image received via the lower surface of the prism. The upper surface of the prism is angled relative to the upper surface of the waveguide such that a first normal of the upper surface of the prism is different from a second normal of the upper surface of the waveguide.

A head-up display device includes: light sources; a light source driver that drives the light sources; a second control unit that illuminates the light sources via the light source driver on the basis of illumination control data; and a DMD display element that generates display light on the basis of illumination light emitted by the light sources. The illumination control data includes control modes for generating the illumination light brightness corresponding to a requested brightness. The control modes have differing brightness ranges, which partially overlap each other. The second control unit switches modes between the control modes when the requested brightness has reached a mode switching value, which is located in a non-end part of an overlapping region where one of the brightness ranges of one of the control modes and another one of the brightness ranges of another one of the control modes overlap.

This application provides an image display method and an image display apparatus, and is beneficial to improving uniformity of an image displayed by using a diffractive waveguide, thereby improving user experience. The method is applied to an apparatus including an optical engine and the diffractive waveguide and includes: obtaining uniformity data of a first image obtained by using the diffractive waveguide; determining to-be-compensated data of the optical engine based on the uniformity data; adjusting luminance distribution of a light source in the optical engine based on the to-be-compensated data; and displaying a second image by using the adjusted optical engine and the diffractive waveguide.

A method includes detecting at least one remote vehicle that is within a predetermined distance from the host vehicle, detecting that the light of the remote vehicle that is on, determining a luminous intensity of a light beam emitted by the light of at least one remote vehicle that is within the predetermined distance from the host vehicle, comparing the luminous intensity of the light beam emitted by the light of at least one remote vehicle to a predetermined threshold to determine whether the luminous intensity of the light beam emitted by the light is greater than the predetermined threshold in response to determining the luminous intensity of the light of at least one remote vehicle that is within the predetermined distance from the host vehicle, and dimming at least a portion of the windshield of the host vehicle.

In an image display device in which two light guides are combined, flat plates (16, 17) of the same material as that of a substrate (11) of a first light guide (10) is affixed to the outsides of a first surface (11a) and a second surface (11b) of the substrate (11), the first surface (11a) and the second surface (11b) opposing each other. Image light introduced into the substrate (11) is reflected by an incident-side reflective surface (12) toward exit-side reflective surface (13a to 13f), which are half mirrors, and a part of the image light is reflected in stages by the respective exit-side reflective surfaces (13a and 13f) and the remainder of the image light is transmitted. The image light reflected by the exit-side reflective surfaces (13a to 13f) is emitted through the second flat plate (17) and introduced into a second light guide. The part of the image light reflected by the incident-side reflective surface (12) reaches the interface between the first surface (11a) and the first flat plate (16), but enters the flat plate (16) without being reflected, and hits and is absorbed by a light-absorbing sheet (18). This reduces the occurrence of stray light and improves the visibility of a virtual image displayed before user's eyes.