Display Touch Driver Periodic Scanning to Reduce Line Defects

The patent applies periodic action by sequentially applying touch driving signals to different touch electrode groups in periodic scanning periods. During periods when a specific touch electrode group is being driven, other groups are held at reference voltage, creating a periodic charging and discharging pattern that eliminates continuous coupling effects and prevents horizontal line defects.

The patent segments the touch electrode structure into multiple groups (first touch electrode group, second touch electrode group, etc.) that are driven sequentially rather than simultaneously. This segmentation allows the display panel to maintain uniform voltage distribution across different regions by isolating the coupling effect to specific segments during their respective scanning periods.

The patent uses periodic scanning to apply touch driving signals only during specific periods when corresponding touch electrode groups are active. During other periods, the reference voltage is applied, creating a periodic charge-discharge cycle that prevents continuous capacitance coupling and maintains luminance uniformity while preserving touch sensitivity during active periods.

The patent applies preliminary action by pre-charging touch electrodes to reference voltage before the main scanning period. This preliminary voltage application ensures that when the touch driving signal is applied, the electrode is already in a known state, preventing sudden voltage changes and capacitance coupling variations that would cause flicker and luminance differences.