HP INCFollow


Modern x360 system design uses two hall sensors for clamshell(CS) & x360 tablet detection. This design leaves a

vulnerability to users if they are unintentionally approaching CS hall sensor with some magnetic components, touch pen

for this example, users might experience panel off or flicker when they are operating system in tablet mode. Problem to

this is due to panel backlight controlled by CS hall sensor directly as illustrated in Fig. 1 below. Fig. 2 shows the circuitry

on current x360 hall sensors design and highlighted in yellow for control pins: LID_SW_3 for CS lid output and

BLON_CON for panel backlight control.

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