Display Screen Aperture Depth for Touch Sensing Accuracy

A screen aperture with predetermined depth is introduced as an intermediary structure between the infrared LEDs and phototransistors. This aperture acts as a spatial filter that allows infrared rays to pass through only when the touch device is in direct contact with the screen, while blocking rays when objects are at a distance. The aperture depth creates a defined sensing zone that eliminates false detection from non-contact objects.

The solution transitions from a two-dimensional touch detection plane to a three-dimensional sensing volume by introducing depth through the screen aperture. The predetermined depth creates a vertical dimension that distinguishes between contact and non-contact states, allowing the system to differentiate based on the spatial position of the touch device relative to the screen surface.

The solution combines two different sensing modalities - optical sensing (infrared rays for position detection) and mechanical sensing (vibration for contact confirmation) - into a unified touch detection system. The controller integrates signals from both sensor types to make final touch determination, leveraging the strengths of each modality while compensating for their individual weaknesses.

The vibration sensor serves as an intermediary verification mechanism that confirms whether the position sensor's detection corresponds to actual contact. By requiring both position detection and vibration confirmation, the system achieves high measurement precision without significantly increasing overall complexity, as the vibration sensor can be mounted on existing screen structures.