In-Cell Display Sensing Circuit for Crosstalk Cancellation

The patent applies periodic action by alternately setting display voltages to positive and negative polarities in different display cycles. This periodic voltage reversal causes the crosstalk signals from parasitic capacitance to alternate in polarity, allowing the sensor to distinguish between crosstalk (which reverses polarity) and actual light sensing signals (which maintain consistent polarity). This resolves the contradiction by enabling accurate detection despite the presence of parasitic capacitance in the integrated in-cell structure.

The patent converts the harmful effect of parasitic capacitance into a beneficial differentiation mechanism. By exploiting the fact that crosstalk signals reverse polarity when display voltage polarity changes, while genuine light sensing signals do not, the patent transforms the previously harmful parasitic capacitance into a distinguishable feature. This allows the system to use the parasitic capacitance's behavior as a marker to identify and eliminate false signals, thereby improving detection accuracy in the cost-effective in-cell architecture.

The patent uses periodic action by alternating the polarity of display voltages between adjacent display cycles. This causes crosstalk signals from the parasitic capacitance between signal wiring and light sensing components to reverse polarity periodically, while genuine sensing signals remain unaffected by voltage polarity changes. By comparing sensing signals from cycles with opposite polarities, the system can identify and eliminate crosstalk, thereby resolving the contradiction between integrated design and crosstalk interference.

The patent converts the harmful crosstalk from integrated signal wiring into a useful differentiation tool. The parasitic capacitance between closely disposed signal wiring and light sensing components generates crosstalk signals that reverse polarity when display voltage polarity changes. This behavior is exploited to distinguish crosstalk from genuine light sensing signals, transforming the previously harmful integrated layout into an acceptable design that maintains both circuit integration and signal accuracy.

The patent implements periodic action by alternating display voltage polarity between adjacent display cycles. This creates a periodic pattern in the crosstalk signals that can be identified through simple comparison operations. The processing complexity is minimized by using straightforward polarity comparison and averaging of sensing signals from opposite polarity cycles, rather than requiring complex filtering or cancellation algorithms.

The patent converts the need for additional signal processing into a benefit by using the polarity alternation to create easily distinguishable signal patterns. The crosstalk signals from parasitic capacitance reverse polarity with each frame, creating a clear signature that can be eliminated through simple averaging or differential processing. This transforms what could be complex signal cancellation requirements into straightforward processing operations that enhance detection accuracy without requiring sophisticated algorithms.