LED unit having electrochromic element
First Claim
1. An LED (light emitting diode) unit comprising:
- an LED comprising;
a base;
a light emitting die mounted on the base;
a pair of leads fixed to the base and electrically connected to the light emitting die; and
an encapsulant attached to the base and covering the light emitting die; and
an electrochromic element mounted on the encapsulant of the LED to cover a part of the encapsulant, when the electrochromic element is applied with an electricity, at least one of a transmittance and a color of the electrochormic element being changed, thereby changing an optical characteristic of light output from the LED unit;
wherein the electrochromic element is annular and has an opening through a center thereof, the encapsulant having a first area exposed in the opening and a second area covered by the electrochromic element; and
wherein when the electrochromic element is applied with the electricity, light emitted from the first area of the encapsulant directly passes through the opening to an outside environment without being changed by the electrochromic element, and light emitted from the second area of the encapsulant passes through the electrochromic element and is changed by the electrochromic element.
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Accused Products
Abstract
An LED unit includes an LED and an electrochromic element mounted on the LED. The LED includes a base, a light emitting die mounted on the base, a pair of leads electrically connected to the die and an encapsulant sealing the die. The encapsulant has a first area and a second area around the first area. The first area contains yellow phosphor therein, and the second area contains red phosphor therein. The electrochromic element has an opening through which the first area of the encapsulant is exposed. The second area of the encapsulant is covered by the electrochromic element. The electrochromic element can change its color when being electrified, thereby changing the color temperature of the light output from the LED unit.
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Citations
12 Claims
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1. An LED (light emitting diode) unit comprising:
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an LED comprising; a base; a light emitting die mounted on the base; a pair of leads fixed to the base and electrically connected to the light emitting die; and an encapsulant attached to the base and covering the light emitting die; and an electrochromic element mounted on the encapsulant of the LED to cover a part of the encapsulant, when the electrochromic element is applied with an electricity, at least one of a transmittance and a color of the electrochormic element being changed, thereby changing an optical characteristic of light output from the LED unit; wherein the electrochromic element is annular and has an opening through a center thereof, the encapsulant having a first area exposed in the opening and a second area covered by the electrochromic element; and wherein when the electrochromic element is applied with the electricity, light emitted from the first area of the encapsulant directly passes through the opening to an outside environment without being changed by the electrochromic element, and light emitted from the second area of the encapsulant passes through the electrochromic element and is changed by the electrochromic element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An LED (light emitting diode) unit comprising:
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a base; a light emitting die mounted on the base; a pair of leads fixed to the base and electrically connected to the light emitting die; an encapsulant sealing the light emitting die, the encapsulant being transparent to allow light emitted from the light emitting die to transmit therethrough; and an electrochromic element mounted on the encapsulant, the electrochromic element being switchable between a first state and a second state according to variation of electricity input thereto; wherein the electrochromic element is annular and has an opening through a center thereof, the encapsulant having a first area exposed in the opening and a second area covered by the electrochromic element; wherein when the electrochromic element is in the first state, light emitted from the first area of the encapsulant directly passes through the opening to an outside environment without being changed by the electrochromic element, and light emergent from the second area of the encapsulant transmits through the electrochromic element to the outside environment; and wherein when the electrochromic element is in the second state, the light emitted from the first area of the encapsulant still directly passes through the opening to the outside environment without being changed by the electrochromic element, and the light emergent from the second area of the encapsulant is at least partially blocked by the electrochromic element or has a color changed by the electrochromic element relative to that of the light emergent from the second area and transmitting to the outside environment through the electrochromic element in the first state. - View Dependent Claims (10, 11, 12)
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Specification