Lighting apparatus with reduced abrupt brightness changes
AssigneeLumileds LLC
InventorsYifeng Qiu, Alan Andrew McReynolds
Life of this patent
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Abstract
A light-emitting apparatus can reduce flicker and retain power efficiency. A method can include driving, by a light emitting element (LEE) driver circuit, first, second, and third LEEs using a pulse width modulation (PWM) driving scheme to generate light of a first color, the first, second, and third LEEs configured to emit different colors, alternating, by the LEE driver circuit, between driving the first, second, and third LEEs using a hybrid driving scheme and the PWM driving scheme, and after alternating between driving the first, second, and third LEEs in the hybrid and PWM driving schemes, driving, by the LEE driver circuit, the first, second, and third LEEs using the hybrid driving scheme.
Claims20
A method comprising:
- driving, by a light emitting element (LEE) driver circuit, first, second, and third LEEs using a pulse width modulation (PWM) driving scheme to generate light of a first color, wherein the first, second, and third LEEs are configured to emit respective different colors;
- alternating, by control circuitry, a driving scheme implemented by the LEE driver circuit, between driving the first, second, and third LEEs using a hybrid driving scheme and the PWM driving scheme;
- and
- after alternating between driving the first, second, and third LEEs in the hybrid or PWM driving schemes, driving, by the LEE driver circuit, the first, second, and third LEEs using the hybrid driving scheme.
A device comprising:
- driver circuitry operable to drive light emitting elements (LEEs) in a pulse width modulation (PWM) driving scheme and a hybrid driving scheme, wherein the LEEs include three or more LEEs that emit respective different colors of light;
- and
- controller circuitry configured to send electrical signals to the driver circuitry that cause the driver circuitry to operate the LEEs in the PWM driving scheme to generate light of a first color, then alternate a driving scheme implemented by the driver circuitry to driving the LEEs in the hybrid driving scheme or the PWM driving scheme, and then drive the LEEs in the hybrid driving scheme.
A system comprising:
- a plurality of light emitting elements (LEEs) configured to emit respective different colors of light;
- driver circuitry operable to drive the LEEs using a pulse width modulation (PWM) driving scheme or a hybrid driving scheme, the LEEs including three or more LEEs that emit respective different colors of light;
- and
- controller circuitry configured to provide electrical signals that cause the driver circuitry to operate the LEEs using the PWM driving scheme to generate light of a first color, then alternate driving the LEEs in the hybrid driving scheme or the PWM driving scheme, and then drive the LEEs in the hybrid driving scheme.
Dependencies are inferred from the claim text.