An optical apparatus having a holding portion and a tubular portion further includes a light source, a light guide which is formed of a medium having a refractive index higher than 1, and an optical converting portion. The light guide has a first light guiding area having an incidence end surface and a second light guiding area having an exit end surface. A diameter of the incidence end surface is larger than a diameter of the exit end surface, and at least a part of the second light guiding area is included in the tubular portion.

An optical apparatus having a holding portion and a tubular portion further includes a light source, a light guide which is formed of a medium having a refractive index higher than 1, and an optical converting portion. The light guide has a first light guiding area having an incidence end surface and a second light guiding area having an exit end surface. A diameter of the incidence end surface is larger than a diameter of the exit end surface, and at least a part of the second light guiding area is included in the tubular portion.

A vehicle interior component comprising a cover with a surface providing a display region is disclosed. The component may comprise a composite layer/structure and light source to provide light at a first and a second visible color/wavelength. The composite layer may comprise light-transmissive segments with color and light-transmissive transparent/translucent segments; light at the first wavelength is transmitted through a first segment and transparent/translucent segment to present a first image/visual effect at the display region; light at the second wavelength is transmitted through a second segment and transparent/translucent segment to present a second image/visual effect at the display region; light at the first wavelength is obstructed by the second segment; light at the second wavelength is obstructed by the first segment; transparent/translucent segments transmit light at first and second wavelengths. The composite layer may comprise a multi-layer form on the cover.

A vehicle interior component comprising a cover with a surface providing a display region is disclosed. The component may comprise a composite layer/structure and light source to provide light at a first and a second visible color/wavelength. The composite layer may comprise light-transmissive segments with color and light-transmissive transparent/translucent segments; light at the first wavelength is transmitted through a first segment and transparent/translucent segment to present a first image/visual effect at the display region; light at the second wavelength is transmitted through a second segment and transparent/translucent segment to present a second image/visual effect at the display region; light at the first wavelength is obstructed by the second segment; light at the second wavelength is obstructed by the first segment; transparent/translucent segments transmit light at first and second wavelengths. The composite layer may comprise a multi-layer form on the cover.

An emission enhancement structure having at least one energy augmentation structure; and an energy converter capable of receiving energy from an energy source, converting the energy and emitting therefrom a light of a different energy than the received energy. The energy converter is disposed in a vicinity of the at least one energy augmentation structure such that the emitted light is emitted with an intensity larger than if the converter were remote from the at least one energy augmentation structure. Also described are various uses for the energy emitters, energy augmentation structures and energy collectors in a wide array of fields.

A light source device includes: blue, green, and red laser light sources; a first retardation plate that controls polarization of blue laser light emitted from the blue laser light source; a polarizing beam splitter that separates the blue laser light whose polarization is controlled by the first retardation plate into a first blue laser light and a second laser light; a second retardation plate that controls polarization of the second blue laser light separated by the polarizing beam splitter; a fluorescent plate that is excited by the first blue laser light separated by the polarizing beam splitter and emits fluorescent light including a green component and a red component; a first dichroic mirror that combines the second blue laser light whose polarization is controlled by the second retardation plate and light emitted from the green and red laser light sources, to generate combined laser light; a dynamic diffuser plate that diffuses the combined laser light combined by the first dichroic mirror to generate diffused laser light; and a second dichroic mirror that combines the diffused laser light diffused by the dynamic diffuser plate and the fluorescent light emitted from the fluorescent plate.

A light emitting device has a light emitting panel and a light guiding structure. The light emitting panel has a pixel, and the pixel has a first sub-pixel. The light guiding structure is set on the light emitting panel and has a plurality of light-guiding units. From a top view direction of the light emitting device, a number N of the light-guiding units that partially overlap with the first sub-pixel satisfies a following equation: (25540(X*Y)^−1)+(173600000(X*Y)^−2)−(0.000749(X*Y)^−3)+(0.0791(X*Y)^−4)−(2.548(X*Y)^−5)−0.1085≤N≤(44027(X*Y)^−1)+(430300000(X*Y)^−2)−(0.005148(X*Y)^−3)+(0.5005(X*Y)^−4)−(15.6(X*Y)^−5)−0.00081967. Where X is a resolution of the light emitting panel in pixels per inch, and Y is a size of a single light-guiding unit in micrometer.

A light emitting device has a light emitting panel and a light guiding structure. The light emitting panel has a pixel, and the pixel has a first sub-pixel. The light guiding structure is set on the light emitting panel and has a plurality of light-guiding units. From a top view direction of the light emitting device, a number N of the light-guiding units that partially overlap with the first sub-pixel satisfies a following equation: (25540(X*Y)^−1)+(173600000(X*Y)^−2)−(0.000749(X*Y)^−3)+(0.0791(X*Y)^−4)−(2.548(X*Y)^−5)−0.1085≤N≤(44027(X*Y)^−1)+(430300000(X*Y)^−2)−(0.005148(X*Y)^−3)+(0.5005(X*Y)^−4)−(15.6(X*Y)^−5)−0.00081967. Where X is a resolution of the light emitting panel in pixels per inch, and Y is a size of a single light-guiding unit in micrometer.

An LED display lighting device is disclosed. The LED display lighting device includes: a substrate including a substrate base and a first electrode part and a second electrode part, both of which are disposed on the substrate base; a plurality of LED chips arranged in a matrix on the substrate; and a diffusion plate covering the upper portions of the LED chips. Each of the LED chips includes: a light-transmitting base; n LED cells disposed under the light-transmitting base and each including a first conductive semiconductor layer, an active layer, and a second conductive semiconductor layer; an interconnection through which the n LED cells are connected in series; a first electrode structure through which the first conductive semiconductor layer of the first LED cell is connected to the first electrode part; and a second electrode structure through which the second conductive semiconductor layer of the n-th LED cell is connected to the second electrode part. The sum of the areas of the active layers of the n LED cells is at least 50% of the area of the light-transmitting base.