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Lighting apparatus with reduced abrupt brightness changes

專利號
US11510302B2
公開日期
2022-11-22
申請人
Lumileds LLC(US CA San Jose)
發(fā)明人
Yifeng Qiu; Alan Andrew McReynolds
IPC分類
H05B45/20; H05B45/325; H05B47/17
技術領域
lees,driving,scheme,pwm,color,hybrid,colors,lee,driver,can
地域: CA CA San Jose

摘要

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.

說明書

In Example 4, Example 3 can further include, before alternating between driving the first, second, and third LEEs using the hybrid driving scheme and the PWM driving scheme, altering a duty cycle of the first, second, and third LEEs to produce the second color using the PWM driving scheme.

In Example 5, Example 4 can further include, wherein the second color is in a range of colors provided by the hybrid driving scheme and the first color is outside the range of colors provided by the hybrid driving scheme.

In Example 6, Example 5 can further include, wherein the first, second, and third LEEs provide light of one of red, green, and blue color.

In Example 7, Example 6 can further include, wherein the first, second, and third LEEs include light emitting diodes (LEDs).

Example 8 includes 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, the LEEs including three or more LEEs that emit respective different colors of light, and controller circuitry configured to cause the driver circuitry to operate the LEEs in the PWM driving scheme to generate light of a first color, then alternate driving the LEEs in the hybrid driving scheme and the PWM driving scheme, and then drive the LEEs in the hybrid driving scheme.

In Example 9, Example 8 can further include, wherein the PWM driving scheme includes driving, in sequence, first, second, and third LEEs of the LEEs, and the hybrid driving scheme includes driving, in sequence, a first pair of the first, second, and third LEEs simultaneously and a second, different pair of the first, second, and third LEEs simultaneously.

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