The present disclosure relates to a flat panel display embedding an optical imaging sensor such as a fingerprint image sensor. The present disclosure suggests a flat panel display embedding an image sensor comprising: a display panel including a display area and a non-display area; and a directional optical unit having a length and a width corresponding to the display panel and a thickness, and attached on a top surface of the display panel, wherein the directional optical unit provides a sensing light to the display area, and wherein the sensing light is collimated and directionized to a predetermined direction.

A lighting device includes an LED, a light guiding member, and a mask member. The light guiding member has a cut to provide a directivity to light emitted from the LED. The cut is provided at a position corresponding to the LED on an emission surface side of the light guiding member. The mask member is disposed on an emission surface side of the cut to block the light emitted from the LED.

A mobile terminal according to the present disclosure may include a body, a light-emitting device provided within the body, a display unit disposed on a front surface of the body, and a corner region of which is formed in a curved surface, and a light guide plate disposed at a lower side of the display unit to guide light emitted from the light-emitting device to the display unit, and formed with a chamfer surface at a corner region facing the curved surface, wherein the light-emitting device is disposed adjacent to the chamfer surface to emit light toward the chamfer surface.

A light guide plate has a light conducting portion having a light input surface for introducing light into the light guide plate, a main light guiding body that is thinner than a maximum thickness of the light conducting portion, and disposed continuously from the light conducting portion, a slanted surface that is disposed on the light conducting portion on at least one of a surface near a light output surface and a surface opposite the surface near the light output surface, and that is inclined from a section of the light guide plate that is thicker than the main light guiding body toward an end of the main light guiding body, two cylindrical surfaces that cut into the slanted surface, and a groove formed by the two cylindrical surfaces.

A lighting system can comprise an edgelit panel, for example a lightguide that may have a panel or slab shape with an edge that is illuminated by an array of light emitting diodes extending along the edge. The edgelit panel may have light directing features associated with the edge. The light directing features can redirect light that is coupled through the edge. The redirected light can emit from a major face of the lightguide to produce a correspondingly redirected pattern of illumination. The resulting illumination of the lighting system can be biased in a particular direction as may be useful for various lighting applications. For example, in a streetlight application, the lighting system can produce illumination that is biased in a street side direction relative to a house side direction.

According the embodiments of the present disclosure, the light guide plate includes a light guide plate body having an upper surface as a light-exiting surface. The light guide plate is provided at a side portion at least one notch, and a light-reflection layer is arranged at a surface of each notch. A wedge-shaped structure is arranged on a lower surface of the light guide plate body and adjacent to a bottom of each notch. The wedge-shaped structure has a first surface attached onto the lower surface of the light guide plate body, a second surface serving as a light-entering surface, and a third surface intersecting the first surface and the second surface and forming an acute angle relative to the first surface. A light-reflection layer is arranged on the third surface. A light source is arranged at a position on the lower surface of the light guide plate body adjacent to the second surface of the wedge-shaped structure.

A light guiding body includes, an introducing portion including a plane of incidence and a plane of reflection opposite to the plane of incidence, a diffusion portion including a first plane provided on a side of the plane of reflection and a second plane provided on the side of the plane of incidence and opposite to the first plane, a first point positioned on a border between the plane of reflection and the first plane, and a second point on the plane of incidence, wherein when a center of curvature of the first plane at the first point is a third point, an index of refraction of the light guiding body is n, the curvature of the first plane at the first point is K, and a distance between the second point and the third point is D, Formula (4) is satisfied.

A light guide plate for a large-size backlight module, and the light guide plate includes a light guide body and a glossy lens array. The light guide body includes a light incident surface for receiving light. The glossy lens array is formed on said light incident surface by thermal reforming a lateral terminal of said light guide body. Said glossy lens array includes a plurality of curvy ridges and the radius of curvature of each of said curvy ridges ranges from 20 μm to 50 μm, and the angle between two tilted edges of each of said curvy ridges ranges from 50 to 60 degrees, whereby said glossy lens array enables said large-size backlight module to be produced in a roll-to-roll production line without burr issue.

An advantage of some aspects of the invention is to provide a virtual image display apparatus in which occurrence of luminance spots is suppressed to improve efficiency of use of illumination light. In the virtual image display apparatus of the invention, an optical-directivity changing section forms a non-uniform distribution concerning the directivity of image lights GL emitted from an image display device. Therefore, even when an angle of a light beam emitted from the image display device and effectively captured into the eye EY of an observer is substantially different depending on a position of the image display device, it is possible to form the image lights GL having directivity corresponding to such an angle characteristic of light beam capturing. It is possible to suppress occurrence of luminance spots to improve efficiency of use of illumination light.

A light guide unit is adapted to be disposed beside a light source. The light guide unit includes a light guide plate and a plurality of optical structures. The light guide plate has a bottom surface, a light emitting surface, a light incident surface, a side surface, a first connecting surface, and a second connecting surface. The bottom surface is opposite to the light emitting surface. The light incident surface, the side surface, the first connecting surface, and the second connecting surface are respectively connected between the bottom surface and the light emitting surface. The light incident surface is disposed between the light source and the side surface. The optical structures protrude on the side surface, the first connecting surface, and the second connecting surface, and together form a Fresnel lens structure. A light source module is also provided.