Provided are a color change module using a reflective display, and an independent type color change control apparatus providing an electrical signal for changing a color of the color change module. The color change module can include a module base, the reflective display, a first external electrode and a second external electrode. The module base has a shape corresponding to an object for attachment. The reflective display is provided on an upper surface of the module base, and displays information in a manner wherein light coming from outside is reflected. The first external electrode and the second external electrode are provided to be connected to the reflective display and to be exposed to outside for receiving the information to be displayed on the reflective display from the independent type color change control apparatus.

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 lighting fixture includes a housing, a light source, and a diffuser. The light source is mounted in the housing. The diffuser is also mounted in the housing such that light emitted from the light source is provided through the diffuser towards an area of interest. The diffuser is configured such that a color of the diffuser is based on one or more characteristics of the light emitted from the light source. Providing the diffuser such that the color thereof is based on one or more characteristics of the light emitted from the light source allows the aesthetic appearance of the lighting fixture to be changed. Further, it allows the lighting fixture to better simulate outdoor environments. Finally, it allows the lighting fixture to convey information to individuals near the lighting fixture without being disruptive.

A lighting fixture includes a housing, a light source, and a diffuser. The light source is mounted in the housing. The diffuser is also mounted in the housing such that light emitted from the light source is provided through the diffuser towards an area of interest. The diffuser is configured such that a color of the diffuser is based on one or more characteristics of the light emitted from the light source. Providing the diffuser such that the color thereof is based on one or more characteristics of the light emitted from the light source allows the aesthetic appearance of the lighting fixture to be changed. Further, it allows the lighting fixture to better simulate outdoor environments. Finally, it allows the lighting fixture to convey information to individuals near the lighting fixture without being disruptive.

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.

Disclosed are an optical gradation system and method. The optical gradation system comprises: a first device configured to emit broad-spectrum linearly polarized light in a first polarization direction; a second device provided with at least one first region for splitting lights of different wavelengths mixed in the broad-spectrum linearly polarized light incident by the first device into emergent lights in different polarization directions without changing a beam propagation path; a third device configured to filter out linearly polarized light in a second polarization direction from the emergent lights from the second device in different polarization directions; and, a rotator configured to drive at least one of the first device, the second device and the third device to rotate, wherein the first device, the second device and the third device are arranged coaxially.

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 medium displays a predetermined number of contents corresponding to a predetermined number of azimuth angles when viewed from a predetermined elevation angle and azimuth angle. An example display medium includes: a planar member that reflects light; and a plurality of protruding members, each protruding member of the plurality of protruding members has a surface occluding the light, placed vertically on the planar member and parallel to each of the predetermined number of azimuth angles. The planar member is partitioned into a plurality of unit cells, where each unit cell is further partitioned into the predetermined number of sub-cells corresponding to the predetermined number of azimuth angles. The protruding member that has the surface parallel to the predetermined azimuth angle is formed for each sub-cell corresponding to the predetermined azimuth angle.

A display medium displays a predetermined number of contents corresponding to a predetermined number of azimuth angles when viewed from a predetermined elevation angle and azimuth angle. An example display medium includes: a planar member that reflects light; and a plurality of protruding members, each protruding member of the plurality of protruding members has a surface occluding the light, placed vertically on the planar member and parallel to each of the predetermined number of azimuth angles. The planar member is partitioned into a plurality of unit cells, where each unit cell is further partitioned into the predetermined number of sub-cells corresponding to the predetermined number of azimuth angles. The protruding member that has the surface parallel to the predetermined azimuth angle is formed for each sub-cell corresponding to the predetermined azimuth angle.

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.