Piezoelectric Touch Force Sensing on Display Cover Glass

The patent combines a piezoelectric element with the touch panel structure, merging the coordinate sensing function with the force sensing function into a single integrated system. The piezoelectric element is positioned in direct contact with the touch panel's front surface, allowing simultaneous detection of both touch location and applied force without requiring separate sensing systems.

The patent employs composite material structures by integrating the piezoelectric element (made from materials like PZT, PVDF, or quartz) with the touch panel's glass or plastic substrate. This composite construction enables the system to maintain the transparency and touch responsiveness of the original panel while adding the force-sensing capability through the piezoelectric material's response to mechanical stress.

The patent introduces dynamic response capability by using the piezoelectric element to detect varying levels of applied force in real-time. This allows the display system to dynamically adjust line thickness and darkness based on the magnitude of the touch, transforming a static coordinate-only system into one that responds continuously to changes in user input intensity.

The patent utilizes parameter changes in the piezoelectric material's electrical output in response to varying mechanical pressure. As the user applies different forces to the touch panel, the piezoelectric element generates corresponding electrical signals that vary in magnitude, enabling the system to interpret and express different levels of touch intensity through changes in display parameters such as line thickness and color saturation.

The piezoelectric element serves as an intermediary component between the user's finger and the touch panel's sensing layers. It converts mechanical pressure directly into electrical signals that can be processed by existing touch controller electronics, acting as a bridge that adds force-sensing functionality without requiring complete redesign of the underlying control system.

The patent replaces complex mechanical force-sensing mechanisms with the piezoelectric effect, which directly converts mechanical stress into electrical signals. This substitution eliminates the need for mechanical levers, springs, or other moving parts that would be required in traditional force-sensing designs, thereby adding functionality while maintaining structural simplicity.