US 12,408,251 B2
Keyboard backlight control
Yong-Teng Lin, Yilan (TW); Chun-Kai Tzeng, KeeLung (TW); and Bradford Edward Vier, Taipei (TW)
Assigned to Dell Products L.P., Round Rock, TX (US)
Filed by DELL PRODUCTS L.P., Round Rock, TX (US)
Filed on Jul. 30, 2023, as Appl. No. 18/361,856.
Prior Publication US 2025/0040015 A1, Jan. 30, 2025
Int. Cl. G09G 5/00 (2006.01); G06F 3/02 (2006.01); H04R 1/02 (2006.01); H05B 47/115 (2020.01); H05B 47/16 (2020.01)
CPC H05B 47/115 (2020.01) [G06F 3/0202 (2013.01); H04R 1/028 (2013.01); H05B 47/16 (2020.01); H04R 2499/15 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An information handling system comprising:
a plurality of keyboard backlights;
an embedded controller (EC) to communicate with the keyboard backlights, the EC to:
in response to an activate keyboard backlights signal, turn on the keyboard backlights; and
in response to a deactivate keyboard backlights signal, turn off the keyboard backlights; and
a processor to communicate with the EC, the processor to:
receive a sensitivity level setting for detection of an ultrasonic waveform, wherein the sensitivity level setting controls a location of an object with respect to a keyboard to trigger that the ultrasonic waveform is no longer received;
determine whether the ultrasonic waveform is received;
in response to the ultrasonic waveform not being received, provide the activate keyboard backlights signal to the EC; and
in response to the ultrasonic waveform being received, provide the deactivate keyboard backlights signal to the EC.