White light emitting diode using phosphor excitation
First Claim
1. A white light emitting diode using phosphor excitation, comprising:
- a circuit board having a positive electrode, a negative electrode, and a light emitting diode die, the light emitting diode die being driven to emit specific color lights when an external voltage is applied onto the positive electrode and the negative electrode;
a reflective mirror arranged on an emitting path of the specific lights emitted by the light emitting diode die at an appropriate inclined angle, first phosphors being coated on an incident plane of the reflective mirror, the first phosphors configured so that white lights are produced by the specific lights'"'"' exciting the first phosphors; and
a cladding encapsulating the circuit board and the reflective mirror therein, lights reflected by the reflective mirror emitting out of the white light emitting diode through a emitting plane of the cladding, wherein the light emitting diode emits the specific lights to the reflective mirror on the emitting path, and the first phosphors coated on the incident plane of the reflective mirror are excited by the specific lights to generate white lights, and the white lights are reflected by the reflective mirror and then emit through the emitting plane of the cladding.
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Abstract
A white light emitting diode (LED) is provided, which includes a reflective mirror arranged on the light emitting path of a blue or an ultra violet LED die at an appropriate angle. Phosphors are coated on the reflective mirror, the emitting plane of the LED, or both so that the phosphors are excited by the blue or UV lights emitted by the LED die to produce white lights. The present invention provides a white LED having a long lifetime and a uniform light color by separating the phosphors from the LED die, and by allowing the lights emitted from the LED die to undergo several excitations with the phosphors.
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Citations
18 Claims
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1. A white light emitting diode using phosphor excitation, comprising:
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a circuit board having a positive electrode, a negative electrode, and a light emitting diode die, the light emitting diode die being driven to emit specific color lights when an external voltage is applied onto the positive electrode and the negative electrode;
a reflective mirror arranged on an emitting path of the specific lights emitted by the light emitting diode die at an appropriate inclined angle, first phosphors being coated on an incident plane of the reflective mirror, the first phosphors configured so that white lights are produced by the specific lights'"'"' exciting the first phosphors; and
a cladding encapsulating the circuit board and the reflective mirror therein, lights reflected by the reflective mirror emitting out of the white light emitting diode through a emitting plane of the cladding, wherein the light emitting diode emits the specific lights to the reflective mirror on the emitting path, and the first phosphors coated on the incident plane of the reflective mirror are excited by the specific lights to generate white lights, and the white lights are reflected by the reflective mirror and then emit through the emitting plane of the cladding. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A white light emitting diode using phosphor excitation, comprising:
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a circuit board having a positive electrode, a negative electrode, and a light emitting diode die, the light emitting diode die being driven to emit specific lights when an external voltage is applied onto the positive electrode and the negative electrode;
a reflective mirror arranged on an emitting path of the specific lights emitted by the light emitting diode die at an appropriate inclined angle; and
a cladding encapsulating the circuit board and the reflective mirror therein, lights reflected by the reflective mirror emitting out of the white light emitting diode through a emitting plane of the cladding, an inner surface of the emitting plane being coated with first phosphors, the first phosphors configured so that white lights are produced by the specific lights'"'"' exciting the first phosphors, wherein the light emitting diode emits the specific lights to the reflective mirror on the emitting path, and then to the emitting plane when reflected by the reflective mirror, and the first phosphors coated on the inner surface of the emitting plan is excited to generate white lights, and the white lights emits through the emitting plane of the cladding. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A white light emitting diode using phosphor excitation, comprising:
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a circuit board having a positive electrode, a negative electrode, and a light emitting diode die, the light emitting diode die being driven to emit a specific light when an external voltage is applied onto the positive electrode and the negative electrode;
a first reflective mirror having an incident plane coated with first phosphors, the first phosphors configured so that white lights are produced by the specific lights'"'"' exciting the first phosphors;
a second reflective mirror having an incident plane coated with second phosphors, the second phosphors configured so that white lights are produced by the specific lights'"'"' exciting the second phosphors;
a beam splitter arranged on an emitting path of the specific lights emitted by the light emitting diode die at an appropriate inclined angle, the beam splitter allowing part of the specific lights on the emitting path to pass through and proceed toward the first reflective mirror and reflecting part of the specific lights toward the second reflective mirror; and
a cladding encapsulating the circuit board and the reflective mirrors therein, lights reflected by the reflective mirrors emitting out of the white light emitting diode through an emitting plane of the cladding, wherein the first phosphors coated on the incident plane of the first reflective mirror is excited by the specific lights falling on the first reflective mirror to generate white lights, and the white lights emits through the emitting plane of the cladding after reflected by the first reflective mirror and the beam splitter; and
the second phosphors coated on the incident plane of the second reflective mirror is excited by the specific lights falling on the second reflective mirror to generate white lights, and the white lights emit through the emitting plane of the cladding after reflected by the second reflective mirror and passing through the beam splitter. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification