Moving light spots in illumination fibers
View Patent ↗An electronic display includes a light source system and a light guide system, where the light guide system emits light features laterally, i.e., from the side, at selected positions along its length. The light source system includes one or more electronically controllable light sources and further includes optical switches or other arrangements for coupling the light sources to the optical fibers or other light guides of the light guide system. The light source system can sequentially or progressively increase the selected longitudinal position at which the light feature is emitted, resulting in the appearance of movement of the light feature along the length of the light guide system.
1. An electronic display apparatus, comprising:
an elongated light guide system extending longitudinally to define an elongated display, the light guide system comprising one or more substantially parallel light guides, the light guide system laterally emitting a light feature from a light guide at a longitudinal position along the elongated display, each of the light guides comprising at least one optical fiber having a first end and a second end;
a first light source optically coupled to the first end of the optical fiber;
a second light source optically coupled to the second end of the optical fiber; and
a controller, the controller providing a first input signal to the first light source and a second input signal to the second light source, the controller adjusting at least one of the first and second input signals relative to the other to sequentially select increasing longitudinal positions along the elongated display and cause the first light source to illuminate a first section of the optical fiber and the second light source to simultaneously illuminate a second section of the optical fiber, whereby the light feature is laterally emitted at a transition zone between the first and second sections, the transition zone moving among the longitudinal positions.
2. The electronic display apparatus claimed in claim 1 , wherein the first light source and second light source emit different colors from one another, and the light feature comprises a transition between the different colors.
3. A method for generating a light display in an elongated light guide system comprising one or more substantially parallel optical light guides, a first light source and a second light source, each of the light guides comprising at least one optical fiber having a first end and a second end, the method comprising:
generating control signals including information defining a selected longitudinal position along the light guide system, the control signals including a first input signal provided to the first light source and a second input signal provided to the second light source, wherein generating control signals comprises adjusting at least one of the first and second input signals relative to the other to sequentially select increasing longitudinal positions;
controlling a light source system in response to the control signals including causing the first light source to introduce light into the first end of the optical fiber to illuminate a first section of the optical fiber and the second light source to simultaneously introduce light into the second end of the optical fiber to illuminate a second section of the optical fiber, the light source system adjusting one or more of the first input signal and the second input signal to define the selected longitudinal position; and
laterally emitting a light feature from the light guide system at the selected increasing longitudinal positions along the light guide system, wherein a transition zone between the first section of the optical fiber and the second section of the optical fiber moves among the selected longitudinal positions.
4. The method claimed in claim 3 , wherein the first light source and second light source are of different colors.