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US 10,295,721 B1Granted
Adjustable color temperature illumination
AssigneeAmazon Technologies, Inc.
InventorsEric Gifford Marason, Miguel Virgen, Christopher Dwight Barnes
Life of this patent
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Abstract
Various approaches discussed herein enable techniques for adjusting color temperature value of illumination, for example with regard to electrophoretic ink display screens. A plurality of one type of LEDs are positioned along an injection line of a light guide panel, and are interleaved with a plurality of another type of LED positioned along the injection line. By controlling the current supplied to each group of LEDs, a color temperature value of light directed onto a display screen from the light guide panel may be adjusted to remove or reduce blue aspects.
Claims18
A computing device, comprising:
- an electrophoretic display screen;
- a light guide panel operable to receive light that is subsequently directed towards the electrophoretic ink display screen;
- a first plurality of light emitting diodes (LEDs) positioned at an edge of the light guide panel, the first plurality of LEDs emitting bluish-white light having a first color temperature value into the light guide panel;
- a second plurality of LEDs positioned at the edge of the light guide panel, the second plurality of LEDs emitting yellowish-white light having a second color temperature value lower than the first color temperature value into the light guide panel,
- wherein the electrophoretic display screen receives the bluish-white light and the yellowish-white light as combined light, and a color temperature value of the combined light is higher than the first color temperature value and lower than the second color temperature value;
- and
- at least one processor and a memory including instructions that, when executed by the at least one processor, cause the computing device to:
- determine an initial color temperature and an initial brightness;
- receive input comprising an indication of a selected color temperature value;
- and
- determine a first current to the first plurality of LEDs and a second current to the second plurality of LEDs, such that the color temperature value of the combined light is substantially equal to the selected color temperature value and a brightness of the combined light is substantially equal to the initial brightness, wherein the first current and the second current are controlled independently and compensate for a brightness response difference between the initial color temperature and the selected color temperature.
8 more elements
A computing device, comprising:
- a display screen;
- a light guide panel coupled to the display screen;
- a first set of illuminating elements positioned at an edge of the light guide panel, the first set of illuminating elements operable to direct first light having a first color temperature into the light guide panel;
- a second set of illuminating elements positioned at the edge of the light guide panel, the second set of illuminating elements operable to direct second light having a second color temperature into the light guide panel, wherein the first light and the second light are combined in the light guide panel resulting in a combined light;
- a first filter element positioned between at least one illuminating element of the second set of illuminating elements and the light guide panel, the first filter element operable to block at least a portion of light in the second light having a wavelength between 450 nm and 495 nm from being directed to the light guide panel;
- a first current controlling element to provide a first current to the first set of illuminating elements, the first current causing the first light to have the first color temperature value;
- a second current controlling element to provide a second current to the second set of illuminating elements, the second current causing the second light to have the second color temperature value, the first current controlling element controllable independently from the second current controlling element;
- and
- at least one processor and memory including instructions that when executed by the at least one processor, cause the computing device to:
- determine an initial combined temperature value and an initial combined brightness value for the combined light;
- determine a target combined temperature value for the combined light;
- and
- determine, using a brightness response metric, an adjusted value for the first current and an adjusted value for the second current resulting in combined light having the target combined temperature value and the initial brightness value.
10 more elements
A method, comprising:
- arranging a first set of illuminating elements at an edge of a light guide panel, the first set of illuminating elements operable to direct first light into the light guide panel;
- arranging a second set of illuminating elements at the edge of the light guide panel, the second set of illuminating elements operable to direct second light into the light guide panel, wherein the first light and the second light are combined in the light guide panel resulting in a combined light;
- positioning a first filter element between at least one illuminating element of the second set of illuminating elements and the light guide panel, the first filter element operable to block at least a portion of light in the second light having a wavelength between 450 nm and 495 nm from being directed into the light guide panel;
- providing a first current to the first set of illuminating elements, the first current causing the first light to have a first color temperature value;
- and
- providing a second current to the second set of illuminating elements, the second current causing the second light to have a second color temperature value, the first current and the second current being independently controlled to produce a determined combined light temperature and a determined combined light brightness based on a brightness response for the determined combined light temperature.
3 more elements
Dependencies are inferred from the claim text.