Apple Inc.

Yu-Heng Cheng

Shih Chang Chang

Victor H Yin

Shinya Ono

Kyung Wook Kim

Jason N Gomez

Saman Saeedi

Nikolaus Hammler

Donggeon Han

Suk Won Hong

Hongwoo Lee

Szu-Hsien Lee

Rungrot Kitsomboonloha

Pei-En Chang

Sagar Rajiv Vaze

Isaac W Chan

Prathit Bugnait

Young-Jik Jo

Joyan Gratian Sanctis

Joyan G Sanctis

An electronic device may have a display with touch sensors. One or more shielding layers may be interposed between the display and the touch sensors. The shielding layers may include shielding structures such as a conductive mesh structure and/or a transparent conductive film. The shielding structures may be actively driven or passively biased. In the active driving scheme, one or more inverting circuits may receive a noise signal from a cathode layer in the display and/or from the shielding structures, invert the received noise signal, and drive the inverted noise signal back onto the shielding structures to prevent any noise from the display from negatively impacting the performance of the touch sensors. In the passive biasing scheme, the shielding structures may be biased to a power supply voltage.

Shielding for electronic device displays with touch sensors

Differential driving and/or sensing can reduce noise in a touch screen. In some examples, the touch electrodes and/or routing traces can be implemented using metal mesh in first and second metal layers. To mitigate electrical interference at the touch screen from a display, a display-noise shield or sensor can be provided between the display and the touch screen. In some examples, a shield can minimize a noise contribution from the display to signals generated at the touch screen. In other examples, a sensor can enable a differential read out of signals at the touch screen that subtracts a noise component measured by the sensor. Forming the shield or sensor, and the touch screen over the display using an on-cell process can improve touch screen performance and yield. The shield can be connected to a conductive ring and flex circuit via tapping points in a stackup separate from a display stackup.

Touch screen shield layer with ring and tapping points

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Campbell, CA, United States of America

Yu-Heng Cheng