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Patent US9661715


Issued 2017-05-23

Solid State Light Emitting Devices Including Adjustable Melatonin Suppression Effects

Solid state light emitting devices include multiple LED components providing adjustable melatonin suppression effects. Multiple LED components may be operated simultaneously according to different operating modes according to which their combined output provides the same or similar chromaticity, but provides melatonin suppressing effects that differ by at least a predetermined threshold amount between the different operating modes. Switching between operating modes may be triggered by user input elements, timers/clocks, or sensors (e.g., photosensors). Chromaticity of combined output of multiple LED components may also be adjusted, together with providing adjustable melatonin suppression effects at each selected combined output chromaticity.



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3 Independent Claims

  • 1. An illuminated display device comprising: a display panel configured to display at least one of images or text; and a backlight arranged to illuminate the display panel, wherein the backlight comprises: a first LED component; a second LED component; and a timer or clock arranged to trigger switching between a first operating mode and a second operating mode; wherein in the first operating mode the first LED component and the second LED component generate combined emissions that (i) are within six MacAdam ellipses of a target correlated color temperature, and (ii) embody a first melatonin suppression milliwatt per hundred lumens value; and wherein in the second operating mode the first LED component and the second LED component generate combined emissions that (i) are within six MacAdam ellipses of the target correlated color temperature, and (ii) embody a second melatonin suppression milliwatt per hundred lumens value that is at least about 10 percent greater than the first melatonin suppression milliwatt per hundred lumens value.

  • 11. A light emitting apparatus comprising: a first LED component; a second LED component; and at least one of a timer, a clock, a user input element, or a sensor element; wherein the first LED component and the second LED component are arranged to be operated in a first operating mode in which combined emissions of the first LED component and the second LED component embody a first melatonin suppression milliwatt per hundred lumens value; wherein the first LED component and the second LED component are arranged to be operated in a second operating mode in which combined emissions of the first LED component and the second LED component embody a second melatonin suppression milliwatt per hundred lumens value that is at least about 10 percent greater than the first melatonin suppression milliwatt per hundred lumens value; and wherein the light emitting apparatus is arranged to trigger switching between the first operating mode and the second operating mode responsive to an output signal of the at least one of a timer, a clock, a user input element, or a sensor element.

  • 21. A light emitting apparatus comprising: a first LED component; a second LED component; and a control device; wherein the control device is arranged to operate the first LED component and the second LED component in a first operating mode in which combined emissions of the first LED component and the second LED component (i) are within six MacAdam ellipses of a target correlated color temperature, and (ii) embody a first melatonin suppression milliwatt per hundred lumens value; wherein the control device is arranged to operate the first LED component and the second LED component in a second operating mode in which combined emissions of the first LED component and the second LED component (i) are within six MacAdam ellipses of the target correlated color temperature, and (ii) embody a second melatonin suppression milliwatt per hundred lumens value that is at least about 10 percent greater than the first melatonin suppression milliwatt per hundred lumens value; and wherein the light emitting apparatus comprises at least one of the following features (a) to (c): (a) at least one of the first LED component or the second LED component comprises at least one LED arranged to stimulate emissions of at least one lumiphoric material; (b) combined emissions of the first LED component and the second LED component, when operated in the first operating mode, embody a color rendering index (CRI) value of at least about 80; or (c) the light emitting apparatus comprises at least one element selected from the group consisting of a timer, a clock, a photosensor, and at least one user input element, wherein the at least one element is arranged to trigger switching between the first operating mode and the second operating mode.