The core of optical touch screen lies in the IR touch frame. The ir touch overlay is composed of a series of infrared emitting tubes and infrared receiving tubes. At the beginning of its work, infrared emitting tubes emit infrared rays, which create a thin and orderly network of light in front of the screen, like an invisible spider web of light, evenly covering the surface area of the screen.

Principle of touch sensing

When there is a touch action, such as a finger or a stylus touching the screen, it will block part of the propagation path of infrared light. The infrared receiving tube in the infrared touch box monitors the reception of infrared rays at all times. Once the infrared rays are blocked, the intensity of the light received by the corresponding receiving tube will be weakened. Through the accurate analysis of the signal changes of each receiver, the infrared touch box can quickly determine which beam or several beams of infrared light are blocked, and then calculate the specific coordinate position of the touch point on the screen according to the pre-set light matrix layout. Due to the large number and close arrangement of the transmitter and receiver tubes in the IR touch overlay, it can achieve more accurate touch positioning, whether the touch operation is at the edge of the screen or the center area, it can be accurately captured.

Implementation of multi-touch

In terms of multi-touch functions, the infrared touch box also performs well. When multiple touch points appear on the screen at the same time, the infrared touch box can simultaneously detect the occlusion of multiple infrared rays. It can distinguish the infrared changes corresponding to different touch points, and calculate the coordinates of each touch point. For example, when performing two-finger zoom operation, the infrared touch box can track the position changes of the two finger touch points in real time, and quickly transmit these information to the device system, so as to realize the corresponding functions such as image magnification or reduction.

Environmental adaptability and advantages

The infrared touch frame endow the optical touch screen with good environmental adaptability. It is not too limited by the screen surface material, whether it is glass material or some special plastic material screen, infrared touch technology can be effectively applied. Moreover, the infrared touch box also has certain advantages in anti-interference ability. It can still work stably under the general indoor lighting environment changes and a certain degree of electromagnetic interference environment, ensuring the accurate recognition and response of touch operations, and providing users with a smooth touch interaction experience.