A display device includes a patterned panel and a light emitting module. The patterned panel includes a light-transmitting substrate, a first light-transmitting portion, a second light-transmitting portion and a third light-transmitting portion. Each of the light-transmitting portions respectively has a first transmission spectrum, a second transmission spectrum and a third transmission spectrum. The third light-transmitting portion is adjacent to the first light-transmitting portion and the second light-transmitting portion, and the third transmission spectrum has a first overlapping part with the first transmission spectrum, and has a second overlapping part with the second transmission spectrum. The light emitting module includes a first light emitting unit and a second light emitting unit, the first light emitting unit emits a first light having a peak wavelength in the first overlapping part, and the second light emitting unit emits a second light having a peak wavelength in the second overlapping part.

An information display device (1G) attachable to a structure includes a display panel (23) and a surface member (11). The display panel (23) has a display surface and displays information on the display surface. The surface member (11) is disposed on the display surface side of the display panel (23) and is in a state where only the information displayed on the display surface of the display panel (23) is visible through the surface member (11) when the display panel (23) is turned on. The surface member includes a first layer (71) disposed on a front side, and a second layer (72) that is disposed on the display panel (23) side with respect to the first layer (71). The second layer (72) is configured to compensate the difference of transmittance depending on the position on the first layer (71).

A method may include supplying electric power to a first light source and a second light source of at least two light sources by at least one ballast so that the first light source and the second light source emit a first source light and a second source light with a first and second spectral light distribution, respectively. The method further includes superimposing the first and second source light using an optical unit such that the lighting device outputs light with a spectral superposition light distribution. The method further includes detecting the light outputted from the lighting device using a light distribution sensor that provides a sensor signal corresponding to a spectral light distribution of the detected light. The method further includes comparing the sensor signal to a predefined spectral light distribution and adjusting the electric power supplied to the respective light source by the ballast based on the comparison.

This lighting device (1) is provided with a first light source (L1) and a second light source (L2). The first light source (L1) emits a first light. The second light source (L2) emits a second light. The first light and the second light have substantially the same color temperature but different spectral characteristics. This lighting device (1) is configured such that the first light and the second light are alternately irradiated onto a road sign (2).

A display device includes a patterned panel and a light emitting module. The patterned panel includes a light-transmitting substrate, a first light-transmitting portion, a second light-transmitting portion and a third light-transmitting portion. Each of the light-transmitting portions respectively has a first transmission spectrum, a second transmission spectrum and a third transmission spectrum. The third light-transmitting portion is adjacent to the first light-transmitting portion and the second light-transmitting portion, and the third transmission spectrum has a first overlapping part with the first transmission spectrum, and has a second overlapping part with the second transmission spectrum. The light emitting module includes a first light emitting unit and a second light emitting unit, the first light emitting unit emits a first light having a peak wavelength in the first overlapping part, and the second light emitting unit emits a second light having a peak wavelength in the second overlapping part.

A method may include supplying electric power to a first light source and a second light source of at least two light sources by at least one ballast so that the first light source and the second light source emit a first source light and a second source light with a first and second spectral light distribution, respectively. The method further includes superimposing the first and second source light using an optical unit such that the lighting device outputs light with a spectral superposition light distribution. The method further includes detecting the light outputted from the lighting device using a light distribution sensor that provides a sensor signal corresponding to a spectral light distribution of the detected light. The method further includes comparing the sensor signal to a predefined spectral light distribution and adjusting the electric power supplied to the respective light source by the ballast based on the comparison.

Non-emergency illumination apparatus (10) arranged in use to mark a location of an article, fixture or fitting in an aircraft cabin, the apparatus including: an emitting layer (2) including a photoluminescent material, the photoluminescent material emitting visible light in a first region of the electromagnetic spectrum in response to excitation by light from a second region of the electromagnetic spectrum, different to the first region; and a protective layer (6) overlying the emitting layer, the protective layer transmitting light from the first and second regions of the electromagnetic spectrum, wherein the non-emergency illumination apparatus is constructed and arranged to be placed in proximity to an article, fixture or fitting, such that the apparatus marks the location of the article, fixture or fitting when excited by light from the second region of the electromagnetic spectrum. The illumination apparatus can comprise a carrier matrix. The illumination apparatus aids location of items such as headphone sockets and power sockets in low lighting conditions so calming passengers.

A color changing display system includes a fabric body, a light source connected to the fabric body, a controller electrically connected to the light source, and a combined printed image comprising two or more images printed in a single layer on the fabric body. The light source is for producing different light colors. The controller is configured to control the light source to provide a smooth transition between the different light colors. The images are different colors. Each of the different color images reacts with a respective color of the different light colors such that an appearance of the combined printed image changes gradually from a first display image having one particular shape into a second display image having a second particular shape in response to the different light colors interacting with the combined printed image to produce a moving, seemingly holographic effect.

A color changing display system includes a fabric body, a light source connected to the fabric body, a controller electrically connected to the light source, and a combined printed image comprising two or more images printed in a single layer on the fabric body. The light source is for producing different light colors. The controller is configured to control the light source to provide a smooth transition between the different light colors. The images are different colors. Each of the different color images reacts with a respective color of the different light colors such that an appearance of the combined printed image changes gradually from a first display image having one particular shape into a second display image having a second particular shape in response to the different light colors interacting with the combined printed image to produce a moving, seemingly holographic effect.

Wavelength-selective films are visibly apparent under the selective wavelength. Wavelength-selective films typically reflect off axis the selected wavelength and therefore can provide high-contrast against a background when applied in a pattern on a substrate. However, it is difficult to apply unique patterned embedded images from film. Disclosed is a cost-effective method and construction of a patterned wavelength-selective image to a substrate. In the disclosed wavelength-selective image, wavelength-selective film particles are applied to an adhesive pattern to create the wavelength-selective image.