OLED Driver Sensing Circuit Layout for Uniform Sample-and-Hold

The patent changes the capacitance parameters by introducing a first capacitor with a larger capacitance value than the inherent parasitic capacitance in the sample and hold circuit. This parameter change dominates the total capacitance, making the sensing operation uniform across different channels by overcoming the non-uniform parasitic capacitance effects.

The patent extracts and separates the capacitance function into a dedicated first capacitor that is specifically designed to compensate for parasitic capacitance. By taking out the capacitance element as a separate component with controlled parameters, the circuit can independently manage and balance the total capacitance across channels, reducing the harmful effects of parasitic capacitance.

The patent uses parameter changes by selecting capacitor values that are sufficiently large to dominate over the parasitic capacitance, which varies with temperature and process. This ensures that the total capacitance remains relatively stable and uniform across different environmental conditions, maintaining sensing operation uniformity.

The patent creates equipotentiality in terms of capacitance by ensuring that each channel has a first capacitor that compensates for its parasitic capacitance, making the total capacitance equal across all channels. This equipotential approach to capacitance balancing ensures uniform sensing operations despite temperature and process variations.