Patent ID: 11921955
Assignee: NEDERLANDSE ORGANISATIE VOOR TOEGEPAST-NATUURWETENSCHAPPELIJK ONDERZOEK TNO
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A proximity sensor module comprising:
a translucent window having an outer surface;
a light emitting element at a side of the translucent window opposite the outer surface;
an optical radiation sensor at a side of the translucent window opposite the outer surface; and
a signal processor,
wherein the light emitting element is configured to emit optical radiation to be transmitted through the translucent window towards a human finger at a side of the outer surface of the translucent window,
wherein the optical radiation sensor is configured to:
receive a portion of the optical radiation that is reflected by the human finger towards the optical radiation sensor via the translucent window, and
provide a sense signal representative of the portion of the optical radiation,
wherein the sense signal comprises:
a first signal component indicative of a red spectral component of the portion of the optical radiation, and
a second signal component indicative of a green spectral component of the portion of the optical radiation; and

wherein the signal processor is configured to:
receive the sense signal,
determine a first value of the first signal component and a second value of the second signal component relative to a respective nominal value;
compute a ratio between the first value and the second value; and
provide, based on the ratio, an estimate of a pressure exerted by the human finger on the outer surface.