An illumination unit of an embodiment of the present technology includes: an illumination optical system configured to generate illumination light; and a plurality of lenses configured to reduce a divergence angle of the illumination light. The illumination optical system includes: a light source (20) configured to apply light onto an end surface of one of a first substrate and a second substrate; and a light modulation layer (30) provided in a gap between the first substrate and the second substrate. The illumination optical system includes an electrode configured to generate an electric filed that generates, in the light modulation layer (30), a plurality of linear scattering regions (30B) in a three-dimensional mode, and to generate an electric field that generates, in the light modulation layer, a planar scattering region in a two-dimensional display mode. The lenses are arranged side by side in a direction in which the linear scattering regions extend, and are also arranged side by side in a direction intersecting with the direction in which the linear scattering regions extend.

Disclosed are a backlight unit for planar lighting apparatuses and a manufacturing method thereof. The backlight unit simplifies a layer structure to be formed into the shape of a vehicle interior trim part, and has a thin thickness and improved flexibility. The backlight unit includes a light emitting device configured to emit light; a light guide panel having polycarbonate and configured to disperse the light received from a light emitting device; a reflective sheet having fibers and provided below the light guide panel to reflect the light dispersed by the light guide panel; and an acrylic adhesive sheet interposed between the light guide panel and the reflective sheet. The reflective sheet includes pores.

A backlight assembly includes an optical plate, a light source provided near the optical plate, and a brightness redistribution film provided above the optical plate. When light emitted from the light source passes through the optical plate and the brightness redistribution film, a front view angle brightness measured in a normal direction of a light exiting surface of the brightness redistribution film relative to a maximum brightness emitted from the backlight assembly has a brightness ratio N, wherein the brightness ratio N is greater than or equal to 60% and is smaller than 100% (60%N<100%).

Disclosed are a backlight unit for planar lighting apparatuses and a manufacturing method thereof. The backlight unit simplifies a layer structure to be formed into the shape of a vehicle interior trim part, and has a thin thickness and improved flexibility. The backlight unit includes a light emitting device configured to emit light; a light guide panel having polycarbonate and configured to disperse the light received from a light emitting device; a reflective sheet having fibers and provided below the light guide panel to reflect the light dispersed by the light guide panel; and an acrylic adhesive sheet interposed between the light guide panel and the reflective sheet. The reflective sheet includes pores.

A light guiding key comprises a light emitting assembly, a switch assembly, a light shielding assembly, a light guiding member, a light transmitting member, and a light shielding film. Simultaneous and regional display of multiple colors of light on the same key area are carried out by the light guiding key. The light emitting assembly comprises a first light emitting member and a second light emitting member. The switch assembly comprises a switch for controlling whether the second light emitting member emits light and a button for pressing the switch. The light shielding assembly and the button enclose a first light channel and a second light channel which are isolated from each other. The present disclosure also provides an electronic device comprising the light guiding key structure.

A backlight assembly includes an optical plate, a light source provided near the optical plate, and a brightness redistribution film provided above the optical plate. When light emitted from the light source passes through the optical plate and the brightness redistribution film, a front view angle brightness measured in a normal direction of a light exiting surface of the brightness redistribution film relative to a maximum brightness emitted from the backlight assembly has a brightness ratio N, wherein the brightness ratio N is greater than or equal to 60% and is smaller than 100% (60%N<100%).

A light guiding key comprises a light emitting assembly, a switch assembly, a light shielding assembly, a light guiding member, a light transmitting member, and a light shielding film. Simultaneous and regional display of multiple colors of light on the same key area are carried out by the light guiding key. The light emitting assembly comprises a first light emitting member and a second light emitting member. The switch assembly comprises a switch for controlling whether the second light emitting member emits light and a button for pressing the switch. The light shielding assembly and the button enclose a first light channel and a second light channel which are isolated from each other. The present disclosure also provides an electronic device comprising the light guiding key structure.

A back cover integrated with a light guide plate and a method of manufacturing the same, and a back light unit and a liquid crystal display device including the same are disclosed. The back cover integrated with a light guide plate comprises a reflective sheet attached onto a cover glass; a light guide plate attached onto the cover glass to cover the reflective sheet; and a light guide plate coupling member between the light guide plate and the cover glass.

A lighting device includes a laser light source that emits laser light, a wavelength converter that converts a wavelength of the laser light and emits wavelength-converted light, and a linear light guide that is elongated and guides the wavelength-converted light emitted by the wavelength converter and introduced through a longitudinal end surface. The linear light guide includes a lateral surface that emits the wavelength-converted light guided by the linear light guide. A proportion of the wavelength-converted light emitted by the lateral surface gradually increases with an increase in optical path length in the linear light guide.

An illumination device includes: an elongated light guide; a first light source; a second light source; and a controller. A first increase beginning time point at which the brightness of the first light source begins to increase from zero is prior to a second increase beginning time point at which the brightness of the second light source begins to increase from zero. A first increase finish time point at which the brightness of the first light source finishes increasing to the first set brightness is simultaneous with or prior to a second increase finish time point at which the brightness of the second light source finishes increasing to the second set brightness. A time from the first increase beginning time point to the second increase finish time point is not more than 0.2 seconds.