Qualcomm Incorporated

Apple Inc.

Bo-Ren Wang

Lennart Karl Mathe

Sandeep Louis D'Souza

Nathan Felix Altman

Suryaprakash Ganti

David William Burns

Meir Agassy

Masoud Roham

Ashish Hinger

Vadim Winebrand

Sherman Sebastian Antao

Paul Penchin Pan

Yizhaq Abudi

Micah Timothy Lawrence

Jong Soo Kim

Tsung-Ting Tsai

Ting-Kuo Chang

Abbas Jamshidi Roudbari

Kingsuk Brahma

Chieh-Wei Chen

Warren S Rieutort-Louis

Qing Li

Sameer Wadhwa

Shyuan Yang

Injae Hwang

Yuchi Che

Yue Jack Chu

Graeme M Williams

Ricardo A Peterson

Salman Kabir

Kyounghwan Kim

Feng Wen

Wenbing Hu

Junbo Wu

An electronic device includes a display and a sensor underneath the display. The display has a full pixel density region and a reduced pixel density region. Compared to pixels in the full pixel density region, pixels in the reduced pixel density region can be controlled using overdriven power supply voltages, overdriven scan control signals, different initialization and reset voltages, and can include capacitors and transistors with different physical and electrical characteristics. Gate drivers provide scan signals to pixels in the full pixel density region, whereas overdrive buffers provide overdrive scan signals to pixels in the reduced pixel density region. The pixels in the full pixel density region and the pixels in the reduced pixel density region can be controlled using different black level or gamma settings for each color channel and can be adjusted physically to match luminance, color, as well as to mitigate differences in temperature and aging impact.

Displays having reduced pixel density region with localized tuning

Systems, methods and apparatus for configuring a fingerprint sensor to operate in a capacitive sensing mode and an ultrasonic sensing mode are disclosed. A fingerprint sensor may be configured to operate in a capacitive sensing mode by driving a sensing electrode using a controller. In some implementations, an object positioned on or near the sensing electrode may be detected using the fingerprint sensor in the capacitive sensing mode, and the controller can drive electrodes of the fingerprint sensor differently to configure the fingerprint sensor to operate in an ultrasonic sensing mode. In some implementations, an applications processor may be instructed to authenticate a fingerprint of the object from image data obtained when the fingerprint sensor is operating in the ultrasonic sensing mode. In some implementations, a display of a mobile device containing the fingerprint sensor may be unlocked, or the mobile device may be woken up when the fingerprint is authenticated.

Hybrid capacitive and ultrasonic sensing

The present disclosure describes aspects of a capacitance-to-voltage modulation circuit. In some aspects, the circuit is used in touch sensing. In some aspects, a modulation circuit comprises a first pair of switches having one switch connected between a voltage source and a capacitor, and another switch connected between ground and the input of the circuit. The circuit also includes a second pair of switches having one switch connected between the voltage source and the input of the circuit, and another switch connected between ground and the capacitor. A third pair of the circuit's switches comprise one switch connected between the capacitor and an input of an analog-to-digital converter (ADC) and another switch connected between the input of the circuit and the input of the ADC. The third pair of switches may enable charge sharing of signals modulated by the first and second pairs of switches, a result of which can be used to sense touch input based on capacitance at the input of the circuit.

Capacitance-to-voltage modulation circuit

Growing community of inventors

San Diego, CA, United States of America

Bo-Ren Wang