A planar illumination device of an embodiment includes a light guide plate, a light source, one or more optical sheets, a bottom frame, and a top frame. The light guide plate receives light from a light incident side surface. The light source emits light to the light incident side surface of the light guide plate. The optical sheet is disposed on a light exit surface side of the light guide plate. The bottom frame houses the light guide plate, the light source, and the optical sheet. The top frame includes an opening, engages with the bottom frame and covers a light exit surface side of the optical sheet. An end portion on an opening side of a side wall of the bottom frame forms a space with a frame portion of the top frame, where the space corresponds to a clearance for an end portion of the optical sheet.

A keyboard device and a backlight module of the keyboard device are provided. The keyboard device includes a casing, the backlight module, a keyboard module and an expansion module. The backlight module includes a main body region and an extension region. The main body region and the extension region are connected with each other. A first light beam is outputted from the main body region to plural keys of the keyboard device. A second light beam is outputted from the extension region to the expansion module.

A backlight module, a method of manufacturing the backlight module, a display device and an illuminating device are disclosed. The backlight module includes: a light guide plate having a first surface and a second surface opposed to each other and at least one side surface between the first surface and the second surface, the side surface being provided with a first light reflecting structure and having an acute angle with respect to the first surface; a light source disposed at a side of the first surface, an orthographic projection of the light source onto the first surface being at an edge portion of the first surface adjacent to the side surface, wherein the light emitted by the light source is at least partially reflected by the first light reflecting structure after entering the light guide plate through the first surface of the light guide plate.

A lighting device disclosed in an embodiment of the invention includes a substrate; a plurality of light sources disposed on the substrate; and a resin layer disposed on the substrate and the plurality of light sources, and a first reflective layer disposed on the resin layer, wherein the resin layer includes an exit surface facing the light sources, the exit surface of the resin layer includes a plurality of convex portions, the plurality of light sources are disposed on a virtual curve, wherein a straight line passing through centers of the first and second light sources adjacent to each other and the centers of each convex portion may be disposed at an obtuse angle with respect to a straight line connecting the adjacent first and second light sources.

According to an aspect, a display device includes: a display panel configured to transmit light; and an illumination device provided on a rear surface side of the display panel. The illumination device includes a plurality of light sources configured to emit light, and a light guiding member that has translucency and is arranged between the light sources on the rear surface side of the display panel. The light guiding member has a plurality of holes each of which opens in a first direction intersecting with a rear surface of the display panel and in each of which a corresponding one of the light sources is disposed, and a light guiding portion surrounding the holes. A rear surface of the light guiding portion is provided with a first inclined surface inclined with respect to the first direction and a plane orthogonal to the first direction.

A lighting device disclosed in an embodiment of the invention includes a substrate; a plurality of light emitting devices on the substrate; a first reflective layer on the substrate; a resin layer on the first reflective layer; and a second reflective layer on the resin layer. The resin layer includes a first surface from which light emitted from the plurality of light emitting devices is emitted, and a second surface opposite to the first surface, wherein the first surface of the resin layer includes a first exit surface having a first curvature, and a second exit surface having a flat surface or a second curvature, wherein a maximum distance from the second surface to the first exit surface may be greater than a maximum distance from the second surface to the second exit surface.

A backlight assembly and a display device are provided. The backlight assembly includes a light guide plate, a light source, and a first reflector sheet. The light guide plate includes a bottom surface and a light emitting surface opposite to each other, and a light incident surface intersecting the bottom surface and the light emitting surface. The light source is on the light incident surface of the light guide plate. The first reflector sheet is on the bottom surface of the light guide plate and at an end of the light guide plate distal to the light source. The backlight assembly further includes a second reflector sheet proximal to the light source. The second reflector sheet is on the bottom surface and/or the light emitting surface of the light guide plate, and a reflectivity of the second reflector sheet is greater than 90%.

A backlight module and an electronic device are provided. The backlight module, having a main region and a peripheral region near the main region, includes a light conversion layer, multiple light conversion patterns located in the peripheral region, and multiple light emitting units emitting a light beam. A first portion and a second portion of the light beam emitted respectively from the main region and the peripheral region both have at least one corresponding position in a CIE 1931 color space. One among the at least one corresponding position of the first portion of the light beam has corresponding coordinates (x1, y1). One among the at least one corresponding position of the second portion of the light beam has corresponding coordinates (x2, y2). The corresponding coordinates (x1, y1) and the corresponding coordinates (x2, y2) satisfy the following relation: 0≤|x1−x2|≤0.2.

According to an aspect, an illumination device includes: a plurality of light-emitting elements arrayed in a matrix along two directions; and a substrate on which the light-emitting elements are provided. The substrate has a plurality of partial regions. The light-emitting elements are arranged in the partial regions such that four light-emitting elements are arrayed in a two-by-two matrix along the two directions in each of the partial regions. Two light-emitting elements adjacent to each other in each of the partial regions are arranged at a first interval in one direction of the two directions. Two light-emitting elements adjacent to each other with a boundary of two partial regions adjacent to each other along the one direction interposed therebetween are arranged at a second interval in the one direction. The first interval is shorter than the second interval.

According to examples, a method for phase plate fabrication may be described herein. The method may include providing an interferometer configuration to generate a hologram of a plurality of pinholes. In some examples, the interferometer configuration includes a substrate for photopolymer attachment, a photopolymer having a predetermined thickness, and an exposure mask with a plurality of pinholes. The method may also include exposing the photopolymer with collimated light, via a laser source, through the exposure mask with a plurality of pinholes, wherein the collimated light passes through the exposure mask itself to create a collimated beam, and the plurality of pinholes of the exposure mask to create a spherical wavefront. The collimated beam and the spherical wavefront may help generate the hologram on the photopolymer for use as a phase plate for improved light transmissivity in display systems.