Circuitry and methods for improving the performance of a light emitting element
AssigneeLinear Technology Corporation
InventorSteven D. Roach
Life of this patent
Estimating the term…
Abstract
Light emitting elements with preselected or adjustable impedance characteristics are provided. Embodiments using a preselected impedance characteristic obtain significant performance benefits compared to the prior art. Embodiments having an adjustable impedance may alter the impedance associated with the light emitting component such that it has a substantially constant resistive or reactive impedance that improves certain performance attributes. This solution virtually eliminates the need for external compensation components and relieves the burden of impedance matching and circuit specialization from the driver circuit.
Claims47
A method for providing a light emitting component with a predetermined input impedance comprising:
- providing a light emitting element disposed on a substrate;
- providing an impedance circuit disposed on the substrate that is coupled to the light emitting element, wherein the light emitting element and the impedance circuit are fabricated on a single substrate;
- adjusting an impedance of the impedance circuit so that the equivalent input impedance of the light emitting component is set to the predetermined value.
A method for providing a light emitting component having an input impedance that substantially matches a characteristic impedance of a transmission line comprising:
- providing a light emitting element disposed on a substrate;
- providing an impedance circuit disposed on the substrate that is coupled to the light emitting element, wherein the light emitting element and the impedance circuit are fabricated on a single substrate;
- adjusting an impedance of the impedance circuit so that the input impedance of the light emitting component substantially matches the characteristic impedance of the transmission line.
A method for providing a light emitting component having an input impedance that substantially matches an output impedance of a driver circuit comprising:
- providing a light emitting element disposed on a substrate;
- providing a variable impedance circuit disposed on the substrate that is coupled to the light emitting element, wherein the light emitting element and the impedance circuit are fabricated on a single substrate;
- adjusting an impedance of the impedance circuit so that the input impedance of the light emitting component substantially matches the output impedance of the driver circuit.
A method for obtaining a desired frequency response from a light emitting element disposed on a substrate comprising:
- determining the desired frequency response of the light emitting element to an input signal;
- providing a network with a variable transfer function coupled to the light emitting element and disposed on the substrate, wherein the light emitting element and the network are fabricated on a single substrate;
- and
- adjusting the transfer function of the network to obtain the desired frequency response from the light emitting element.
A light emitting component comprising:
- a light emitting element disposed on a substrate for emitting light;
- and
- an adjustable impedance network disposed on the substrate and coupled to the light emitting circuit for adjusting the impedance of said light emitting component to a desired value, wherein the light emitting element and the impedance network are fabricated on a single substrate.
A light emitting component comprising:
- a light emitting element fabricated on a substrate for emitting light;
- an impedance network fabricated on the substrate and coupled to the light emitting circuit, wherein the light emitting element and the impedance network are fabricated on a single substrate;
- and
- circuitry for establishing a current threshold of the light emitting component.
A light emitting component comprising:
- a light emitting element fabricated on a substrate for emitting light;
- an impedance network fabricated on the substrate and coupled to the light emitting circuit, wherein the light emitting element and the impedance network are fabricated on a single substrate;
- and
- circuitry for adjusting a current threshold of the light emitting component.
A light emitting component comprising:
- a light emitting element fabricated on a substrate for emitting light;
- an impedance network fabricated on the substrate and coupled to the light emitting circuit, wherein the light emitting element and the impedance network are fabricated on a single substrate;
- and
- circuitry for adjusting a slope efficiency of the light emitting component.
A light emitting component comprising:
- a light emitting element fabricated on a substrate for emitting light;
- an impedance network fabricated on the substrate and coupled to the light emitting circuit, wherein the light emitting element and the impedance network are fabricated on a single substrate;
- and
- circuitry for establishing a slope efficiency of the light emitting component.
A method for obtaining a desired response from a light emitting element disposed on a substrate comprising:
- determining the desired response of the light emitting element to an input signal;
- providing a network with a variable transfer function coupled to the light emitting element and disposed on the substrate, wherein the light emitting element and the network are fabricated on a single substrate;
- and
- adjusting the transfer function of the network to obtain the desired response from the light emitting element.
A method for providing a light emitting component having an input impedance within a predetermined range comprising:
- selecting a range of impedance values;
- providing a light emitting element disposed on a substrate;
- and
- providing an impedance circuit disposed on the substrate and coupled to the light emitting element so that the input impedance of the light emitting component is within the selected range, wherein the light emitting element and the impedance circuit are fabricated on a single substrate.
Dependencies are inferred from the claim text.